Calculation for Feeding System of the Raymond Mill

The feeding control system of the raymond mill uses the closed-loop automatic control. You must first establish the systematically mathematical model for the system, design the speed controller and hardware device, put forward reasonable system strategy and write corresponding control software.
There are a lot of control methods. In terms of the PID control, the design calculation and the control structure are very simple, which are very suitable for the actual engineer. In terms of the PJD control, the accurate mathematical model for the control plan is not needed. Therefore, the control effect for the PID control is very satisfying. Therefore, the PID controller is widely used in the actual practice. The feeding control in this article is established based on the PID principle to establish the closed-loop control model to verify the correctness of the establishment of the model and achieve the simulation experiment of the control model.
The dragging motor of the millstone of the Raymond mill is the main motor, which can be used for automatic start and stop. The dynamic braking can be used for rapid stop, which can increase the response speed and working efficiency. The PJD control calculation is used in the feeding control. The roller mill system of the Raymond mill is the ideal solution for size reduction applications requiring pulverizing of soft to medium hard materials. Ideal applications include various clays such as fire clay, bentonite and kaolin as well as other minerals like barytes, gypsum, limestone, hydrated lime, phosphate rock, talc and coal. Manufactured materials such as pigments, phenolic resins or similar materials can also be processed in a roller mill system.
When the Raymond mill works, it is ideal to maintain the material level in the storage cylinder at the center position. As a result, the material level in the control model had better be set about 50% about the height. In the actual operation, the feeding control system can be used to control certain room of the Raymond mill. The control requirements are not very high.
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Hongxing Impact Crusher Can Crush the Bentonite

Impact Crusher is named according to its working principle. The impact crusher can crush the materials by using the impact crushing principles, which is finer than the jaw crusher. The impact crusher is mainly used for the fine crushing operation in the stone production line. The impact crusher can be used together with the jaw crusher. At present, the impact crusher produced by Henan Hongxing Mining Machinery is widely used for crushing the bentonite.
The bentonite has very wide application in terms of the industry, agriculture, building materials and the construction engineering. In terms of the wastewater treatment, the bentonite can be used as an adsorbent and flocculant to deal with the waste water with low-degree pollution. In most cases, there are some ways to for improvement for the bentonite to get better effect. The common methods for modifying the bentonite include the activation method (including acidification method, oxidation, reduction, calcination method, a hydrogenation method, etc.) and the inorganic or organic compounds, or simultaneously adding an organic inorganic compound prepared composite bentonite. This way for treat with the waste water buy the bentonite has a lot of application examples. In addition, the inorganic bentonite can be used for the architectural coatings which can increase the consistency of the paint, also plays the suspension and anti-settling role. Bentonite Impact crusher is used as a secondary crusher,bentonite impact crusher is widely used in bentonite mining and crushing plant. bentonite impact crusher can handle particle size is less than 500 mm. Mined bentonite first is transported to the processing plant and stockpiled. if the raw clay has a relatively high moisture content (30 to 35 per cent), the stockpiled material may be ploughed to facilitate air drying to a moisture content of 16 to 18 per cent.
As the new generation of the impact crusher for crushing the bentonite, the impact crusher produced by Henan Hongxing Mining Machinery can make full use of the high-speed impact energy generated by the rotor. This kind of impact crusher has the advantages of large crushing ratio, simple structure, small volume and low energy consumption.
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The Operating Principle of Hongxing Cone Crusher

Recently, Henan Hongxing Mining Machinery has produced a new generation of cone crusher. In this article, the experts of Henan Hongxing Mining Machinery will carefully analyze the operating principles of the cone crusher for customers. In the actual operation, the cone crusher uses the working surface between the cone and the fixed cone of itself for crushing the ores. The moving cone is supported on the spherical bearing and it is fixed on a hanging vertical axis. The vertical axis is placed in the eccentric sleeve, and the eccentric sleeve is placed on the thrust bearing. The moving cone and the vertical axis are together driven by the triangle belt. The lower part of the vertical shaft is placed in the eccentric sleeve. When the eccentric sleeve rotates, a conical surface will be drawn through the shaft. As a result, when the moving cone closes to the fixed cone, the ores will be crushed. The shell of the crushing cavity of the crusher machine is composed by two parts and is connected with the screw. There is a strong spring on the screw sleeve. The spring has the following role. When the metal or other hard objects fall into the crushing cavity, the crusher machine will not be damaged. If metal or other hard objects, such as the nut and the drill bit fall into the crushing cavity with the ores, the fixed cone will be lifted to enlarge the discharging port to make the foreign bodies discharge from the crushing cavity.
The cone crusher produced by Henan Hongxing Mining Machinery is fast, accurate and simple, which can adjust the discharging port of the crusher machine. In addition, the cleaning function of the crushing cavity can also be achieved through the hydraulic device, which can quickly clean the crushing cavity. In this way, the manpower can be greatly saved. In addition, the delay for the operation caused by the artificial cleaning can be minimized. The new generation of the cone crusher can greatly improve the production efficiency and working performance compared with the traditional common cone crusher. The new generation of cone crusher produced by Henan Hongxing Mining Machinery will be your best choice.
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How to Repair Attrition of Moving Jaw of Jaw Crusher

There are two jaws in the jaw crusher, which can be divided into the fixed jaw and the moving jaw. The moving jaw is a kind of very important component for the jaw crusher. As a result, the maintenance for the moving jaw is very necessary. The attrition of the inner hole of the moving jaw of the jaw crusher is very common. Through many years’ practical experience, the experts of Henan Hongxing Mining Machinery have summarized the following require methods for the attrition of the inner hole of the moving jaw of the jaw crusher.
The first is the welding method for the inner hole. This method is suitable for the moving jaw made of the casting steel. Uniformly surface a layer on the surface of the worn inner hole with the manual arc welding. Then expand and process the inner hole again according to the requirements of the tolerance so that it can be well matched with the outer diameter of the bearing. In terms of this method, the welding layer for the inner hole is relatively thin, while the wall of the moving jaw is relatively thick. As a result, there will be no deformation in surfacing process. In addition, there are no special requirements for the welding process. However, in the processing procedure for the inner hole, you should control the verticality of the center line of the inner hole and the moving jaw to ensure the cooperating relationship and fit precision between the moving jaw and other components.
The second way is the bushing for the inner hole. In the actual operation, the diameter of the inner hole of the moving jaw should be matched with the outer diameter of the rolling bearing. The matching precision and the tolerances should be processed according to the design of the original draft. The bearing should be installed at the inner hole of the moving jaw. This method is not limited by the material of the moving jaw. Therefore, this method is very suitable for the material of the moving jaw with poor welding performance.
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The Operation Process of the Gyratory Crusher Machine

The operation process is very important for a crusher machine. Therefore, we should rightly grasp the operation process of the gyratory crusher machine in the actual operation process to better use the crusher machine. How to grasp the operation process of the crusher machine? In this article, let’s take the gyratory crusher machine as an example.
Before starting the gyratory crusher machine, you should pay attention to the following aspects.
First, check the machine according to the inspection contents. Check if the various components of the crusher are in good condition, if all the connections are secure and if there are obstacles in the transmission components.
Second, check whether there are ores or irons in the crushing cavity. If there are ores and other debris, you should clean them as soon as possible to ensure the crusher machine can be started under no-load conditions.
Third, check if auxiliary equipments such as feeder, belt conveyor, electrical equipment and signaling devices are in good condition. In addition, you should check if the discharging mouth meets the requirements of the production process.
Forth, check the oil level and the oil temperature in the tank. If the temperature of the oil in the winter is too low, you should heat the oil until the temperature is more than 20℃.
Fifth, check if the lubrication equipment, oil pump, motor and the interlock device of the motor of the crusher machine are normal.
In terms of the starting program of the gyratory crusher, you should pay attention to the following points.
First, you should start the lubrication system pumps. After the oil return is normal, you can start the motor. At the same time, you should note that if there is abnormal sound in the motor or the crusher machine. Check and adjust the pressure of the oil supply. Check if the oil flow indicator and the entire lubrication system are working properly.
Second, start the host of the gyratory crusher. You need to observe if the operating current of the ammeter is normal. Check if the host and crusher ministries are functioning properly. Add the lubricating grease to the cone hanging device of the crusher machine and other dry oil lubricating parts.
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Features for Heavy Metal Control System of Rotary Kiln

Using the rotary fluidized incineration technology combining with flue gas purification device can effectively control the secondary pollution to reach the national emission standards. When the waste fuel is used, the heavy metal along with the waste fuel will enter the furnace film for combustion. In the combustion process, the heavy metal with different characteristics transforms into two directions in the furnace. Most of the heavy metal coagulates in the ash and reacts with the sulfur and chlorine for consolidation. Part of the metal in gaseous phase enters the gas. The test has proven that the concentration for the emission of the heavy metal is not high. In a summary, the control system of the rotary kiln for the heavy metal has the following advantages.
First, the special design is used to in the rotary kiln which can process the wastes with high calorific value waste. In the kiln, the wastes with calorific value are dried, mixed, homogenized and incinerated partially. The rotary kiln runs without stop. If the temperature of the rotary kiln is too high, it is very unfavorable for the maintenance cost, service life for the kiln body, the working environment on the site and the heat efficiency. Controlling the temperature of the rotary kiln can solve the problems very well. Second, according to the time, temperature and the turbulivity principles, the fluidized bed is the ideal equipment. The fluidized bed itself is particularly adapted to the fuel with low calorific value. The requirements for the waste water are not high, which can avoid the blocking of the impurities. The fluidized bed can achieve the deacidification in the furnace, which can remove most of the acidic materials in the furnace. Third, the fluidized bed tubular wind distribution device with the special design is integrated with the wind distribution, slag cooling and the automatic deslagging as a whole. The operation is convenient with very high technology content.  Forth, the adaptability for the system waste is very board. The system has the characteristics of compact structure, small footprint and high combustion efficiency, which is suitable for the long-term operation.
Original link: http://www.crusher-export.com/ore/n144.htm
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Granulometry for Beneficiation Granularity Sample

In order to check the grinding fineness and evaluate the working efficiency of grinding and crusher machine and the grading equipment, sampling is common and necessary for the discharging ore in the grinding process. In the processing procedure, the particle characteristics of the raw materials should be kept. The specific processing procedures are the followings.
The first process is shrinking. Usually, the shrinking process is carried out in the pulp shrink splitter or the splitter. In the operation process, the splash of the ore samples should be prohibited. The ore samples and the rinse water should be evenly poured into the shrink splitter so that there is no great difference between the samples after splitting.
The second is filtering. Before filtering, you should weigh the paper first and record the weight in one corner of the filter paper and folder good sample labels. You should carefully check if the filter holes of the filter plate are clogged. When the filtering paper has been laid, turn off the vacuum pump or the exhaust valves and use the water uniformly wet the filtering paper. Gently press the edges of the filter paper and the filter disc wall with your finger. After filtering, turn off the vacuum pump or vacuum valve, remove the filter paper and dry the ore sample.
The third is drying. The sample drying is often carried out in a special oven. When different samples are dried at the same time, the sample with high grade should be put at the lowest layer, while the sample with low grade should be put in the upper layer. In addition, the temperature of the oven should not be too high, and the temperature should be generally maintained at between 103℃ and 107℃. You should carefully check if the samples are dried. At regular intervals, take samples from the oven for weighing. If the adjacent two weights are constant (i.e. constant weight), it indicates that the material has been dryied.
The forth is weighing. Weigh the materials taken from the oven.
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Structure and Working Principle of Fine Jaw Crusher

Fine jaw crusher is a kind of jaw crusher with new structure, which is also the improvement based on the simple pendulum-type jaw crusher. The eccentric shaft structure with several moving jaws and eccentric column is used in the new generation of the jaw crusher. This kind of jaw crusher is uitable for the medium and the small mines, building materials, road construction, silicate and chemical industry and other departments for crushing the materials. The fine jaw crusher can be used for crushing the ore and rock whose feeding particle size is not more than 120mm and compression strength is less than 250Mpa.
The fine jaw crusher mainly consists of frame, moving jaw, eccentric shaft, fixed jaw plate, liner and other component parts. Its working principles are the followings. The motor drives the rotation of the eccentric shaft through the belt so that the moving jaw can move according to the trajectory adjusted to crush the materials in the crushing cavity. The materials after being crushed are discharged from the discharging port with the self gravity of the materials. The rack is the welding weld junction piece. Two side guard plates are used to help the fixed jaw plate to be fixed on the front wall of the rack which can prevent the rack from being worn. The liner of the moving jaw is installed on the moving jaw, which can prevent the moving jaw from being worn. When one end of the moving jaw is worn, you can turn the head of the moving jaw for second use.
There are two sets of the moving jaw and liners of the moving jaw for the fine jaw crusher. They are arranged in a line. The moving jaw hangs on the eccentric shaft. The eccentric part of the eccentric shaft can be divided into two parts. The eccentric distance is the same, while the eccentric direction is opposite. Each movable jaw moves toward the fixed jaw with the action of the eccentric shaft. The adjustment seat can move forward or backward on the two sides of the rack. There are two groups of the adjustment pads between the adjustment and the back wall of the rack.
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Milling Machine Is Suitable for Processing Carbonate

The heavy calcium carbonate is also called the triple superphosphate which is often used as the inorganic filler in the industry. According to the different fineness after processing, the triple superphosphate can be divided into different specifications, such as the solo powder and flying powder. The processing procedure of the heavy calcium is very simple. The process is to use the fine crushing equipment, the conveying equipment and the industrial milling equipment to process the raw mineral materials with the calcium carbonate. The equipments include the jaw crusher, the triple superphosphate ultrafine milling machine and the conveyor machines.
The light calcium carbonate is also known as the light calcium, which regards the limestone as the raw material. After high-temperature calcination, the water digestion, carbon dioxide carbonation, dewatering, drying, cooling and pulverization process, a kind of industrial raw material can be obtained after the sieving. The light calcium powder can be used as the filler in plastics, paper, rubber, paint and ink industries. In addition, the light calcium carbonate can be used for the toothpaste and cosmetics. It can be also used in medicine, metallurgy and the chemical industry.
The heavy calcium powder and the light calcium powder have obvious requirements of the fineness and the purity of the finished products. The milling machine with medium speed and the superfine milling machine can effectively solute the problem. For the processing of the triple superphosphate, the effect is especially good, which can avoid the dust and noise pollution in the processing procedure. In the running process of the equipment, the stability is very good and the working efficiency is high. The triple superphosphate milling machine produced by Henan Hongxing Mining Machinery is favored by a lot of customers at home and abroad.
This kind of heavy calcium carbonate processing equipment is mainly used for processing the calcium carbonate powders whose fineness is 300 to 3000 meshes, which can be freely adjusted. The triple superphosphate powder with different fineness has different uses. The rough fineness is about 300 meshes.
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Loop Installation for the Jaw Crusher Machine

The loop of the jaw crusher can be used for sample and measurement. In addition, the loop of the jaw crusher can determine the using parameters of the simulation. Therefore, it generally is not difficult to accurately simulate the existing loop of the jaw crusher. Besides, you can study the optimization of the loop of the jaw crusher according to the determined object.
The experimental methods can be used to determine the parameters of the crusher equipment.  Closed loops are everywhere, and luckily for hydraulics businesses they break all the time, causing workshop owners to grin when a simple seal-kit pump overhaul is needed, to beam when a rotary group needs to be replaced, and to laugh heartily while rubbing (clapping) hands when a major failure causes a complete transmission to drop by.  This is especially vital in case of a major failure caused interventions, because the loop lines get contaminated with all sorts of debris, which can destroy the new transmission in a matter of minutes unless removed from the circuit. The designer must be aware of the project-specific costs of all such elements, so that he can monitor costs and promote methods of reducing total installation costs. In some locations, for example, labor and material costs could make a gabion wall more expensive than a poured concrete wall, which has minimal structural backfill.
When you want to change the size of the crusher equipment, you can determine the parameters of the crusher machine according to the power consumption of the crusher equipment. In the design of the loop of the crusher equipment, an optimistic safe coefficient must be included. At virtually all mines, ore characteristics change over time, and it can be costly to “design in” the optimal flexibility required to handle such changes. Some owners stipulate that initial capital investment be kept to a minimum, with design modifications paid for out of the operating budget. This is not always easy to achieve. There should be no shortcomings for the loop of the jaw crusher. As a result, in the design process, you can add a pump with the appropriate size.
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Issues Should Be Considered in Operation of Jaw Crusher

In the technology, economy, and maintenance of the crushing operation of the jaw crusher, you must carefully consider the following problems.
First, the multi-segment operation is required in the crushing plant. The last crushing process and the screen is often closed in order to remove the coarse particles of the products. However, the first segment of the operations in the circuit will not lead to the high energy for the design of the crushing plant.
Second, when you choose the type and the size of the jaw crusher, the most important is to ensure the feeding particle size at any segment can smoothly enter the jaw crusher for crushing. You should also choose the jaw crusher according to the production capacity.
Third, when the products are discharged from one side of the discharging port, the infrastructure investment for every ton of the products will not reduce due to the increase of the size of the jaw crusher. These facts are enough to emphasis the importance of the production capacity and the expected feeding particle size.
Forth, for a specific jaw crusher, the compliance relationship between the drag power and the feeding rate is approximately linear. In addition, when the feeding rate increases, the drag power is close to the power with greater consumption. However, the relationship is determined by the particle distribution of the feeding ores and the particle distribution of the products. For a given drag power, the coarse feeding particle and the fine particle of the products will lead to the reduction of the production yield. When the crushing ratio is very large, it is favorable for the multi-stage crushing compared with the single-segment crushing.
Fifth, in the feeding process of the jaw crusher, a lot of fine particles make the production rate of the coarse materials for processing reduce.
Sixth, for the best performance, continuously and stably feeding materials into the jaw crusher is very important. Therefore, the production capacity of the primary jaw crusher must be larger than the average production rate of the other devices in the crushing plant.
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Derivation for Model of Inactive Layer of Rotary Kiln

When the material particles roll down to the lower part of the bed layer into the inactive layer from the active layer, part of the gas is coerced between the particles into the inactive layer. Then the gas and the material particles move the circle movement together with the material particles in the inactive layer. In this process, there are continuous reaction between the gas and the particles. In this article, the experts of Henan Hongxing Mining Machinery regard the concentration of the air as the object for inspection and they try to derivate the volume flow of the gas and the reaction rate of the gas-solid reaction.
Although both the thickness of the active layer in the actual rotary kiln and the moving speed of the particles are the limited values, in order to simplify the model, we should assume that the thickness of the active layer is infinitely thin. According to the mass balance law, the moving speed of the infinitely particles in the active layer are infinitely large. According to this hypothesis, the residence time of the gas in the active layer is almost zero. As a result, the mass transfer in the active layer can be negligible. Although there is discrepancy between this assumption and the actual situation, the calculation for the volume flow of the gas and the reaction rate will not be affected in the actual operation. The gas in the gap of the material particles does the circle movement with the particles. They will not do the curve movement in the inactive layer whose shape is the same as the shape of the rotary kiln until they leave the inactive layer and go back to the surface of the bed layer again. In order to facilitate the analysis, the surface of the bed layer of the rotary kiln is expressed as level.
The derivation for model of the inactive layer of the rotary kiln is very important for the research on the rotary kiln. The derivation may help us to better use the rotary kiln and greatly improve the working efficiency of the rotary kiln.
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Physical Model for the Motion of Cone Crusher

For the cone crusher, the form of the vibration is quite complicated. Since the whole cone crusher is installed on the isolation mounting of the spring, the outer crushing cone has four degrees of freedom, two horizontal degrees of freedom and two degrees of torsion. In the crushing cavity, the inner crushing cone moves horizontally around the outer crushing cone. Since the particle size of the material particles is different, the thickness of the material layers is not even. When the inner crushing cone slides around the material layer, with the change of the thickness of the material layer and the extrusion and impact, innumerable additional weak pulse ripple with different size will appear. The pulse ripple makes the cone crusher produce the additional vibration so that the vibrating form of the crushing system of the cone crusher becomes more complex.
When you establish the double plastid vibration crushing mechanics model, you have to consider the vibrating effect of the material layers. The material layer plays the role to store the energy and absorb the energy in the crushing process. In order to more clearly describe the dual plastid vibration system, the experts of Henan Hongxing Mining Machinery have showed the simplified system mechanics model.
In the double plasmid model, the piecewise linear and the nonlinear hysteretic force can be used to express this action. There is slight gap between the spring and the crushing cone. There will be gap only in the special case or when the filling rate of the materials in the crushing cavity. If the space distribution of the material layer is even, the hysteretic force is symmetrical about the original point of the displacement.
Before studying the two freedom degree double plastid mechanics model, we must have a better understanding about the crushing equipment. The study on the two freedom degree double plastid mechanics model is very important in the actual use of the cone crusher, which may help us better use the cone crusher.
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Failure Summary for the Vibrating Milling Machine

The vibrating milling machine generally uses the motor to directly connect with the milling device. This connection is simple with easy maintenance. However, if they can not be well connected in the assembly process, the overall vibration of the milling machine will be caused. This article will explore the failure summary for the vibrating milling machine.
First, the rotor of the motor and the rotor of the milling machine have different center. The position of the motor can be moved in left or right direction. You can put the pad under the motor to adjust the concentricity between two rotors.
Second, if the rotors of the crusher machine have different centers. The reason is that the two supporting surfaces of the rotor shaft are not in the same plane. You can put a copper pad at the bottom of the bearing or you can add the adjustable wedge at the bottom of the bearing to ensure the two shaft heads have the same center.
Third, the vibration of the part of the grinding chamber is large. The reason is that the connection between the coupling and the rotor has the different center or the weight in the inner part of the rotor is not even. You can adjust the connection of the coupling and the motor according to different types of the coupling. When the weight of the hammer is not even, you can choose each group of the hammer so that the error of the symmetrical hammer is less than 5g.
Forth, the original balance is destroyed. The dynamic balancing test should be done to ensure the whole balance after the motor is repaired.
Fifth, if the anchor bolts loose of the milling system or the foundation is not solid, you should evenly fix the anchor bolts during the installation and the maintenance process. Between the anchor foundation and the milling machine, you should install the damping device to reduce the vibration.
Sixth, if the hammer is broken and there are hard materials, the imbalance of the rotation of the rotor will be caused, which will cause the vibration of the whole machine.
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Solutions for Faults of the Mining Belt Conveyor

In the industrial production, the belt conveyor is gradually been widely used, especially the mine conveyor belt. The production requirements of varieties, high performance, lightweight, multi-functional and long service life have become the focus of most of the users. Therefore, in the using process of the conveyer belts, you should particularly pay attention to the following points.
First, you should avoid that the supporting rollers are covered by the materials, which will cause the inflexibility for the rotation of the machine. The leaking materials should not be stuck between the rolling drum and the belt. Pay attention to the lubrication for the moving part of the belt, but the belt can not be polluted by the oil. Second, starting the belt with load is not allowed. Third, if there is deviation of the belt, you should timely take measures to correct it. Forth, if there is local damage to the belt, you should timely repair it by using the artificial cotton. Fifth, the belt should not be blocked by the rack, pillar or the bulk materials.
In addition, the mining belt conveyor is the main bridge for the crushing and screening production line. The stable and safe operation of the belt conveyor has direct impact on the normal production of the whole mining industry. As a result, we should correctively operate the mining belt conveyor and try our best to solve the faults.
First, for the discharging port of all the coal feeders, the discharging hopper should be replaced and certain angle should be tilted. The buffer pieces are necessary to be added at the lower part of the machine so that the large pieces of the coal will not directly fall down on the belt to reduce their impact action on the belt. Second, lengthen the feed channels of all the coal dropping points and the belt of the belt conveyor. In addition, you should add the net type guide retainer of 3m to 4m. After the large pieces of the coal fall down, they are blocked by the protection mesh and they will move forward along the operating direction of the belt. Second, weld some reinforced liners. The repairing welding is used at the welding mouths to increase the strength of the supporting roller.

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Maintenance Tips for the Composite Crusher

This article will explore the maintenance tips for the composite crusher. A deep understanding about the maintenance tips for the composite crusher can help the users better use the composite and improve the performance of the crusher machine.
First, since the vibration of the composite crusher is great when it is at work, you should install the machine on the concrete foundation. In order to reduce the vibration, noise and the impact on the foundation, a hard wood plate, subber band or other shock absorbing materials should be put between the crusher and the concrete foundation.
Second, the compound crusher works in the impact load. The work life of the babbitt lining on the bearing bush is about two years. You should re-cast the Babbitt lining if time is over the work life.
Third, a metal board should be laid on the discharging cell in the compound crusher. Therefore, enough tilt angle is necessary to prevent the block of smooth discharging of the materials. The tilt angle should be determined according to the liquidity of the crusher and the angle should be not less than 50°.
Forth, if the eccentric shaft and the bearing bush of the composite crusher are worn and the top gap is greater 1.5 times than the top gap of the original assembly, you should adjust or replace the pad.
Forth, when the oil groove of the compound crusher is worn 1.5mm, you should re-open the oil groove or adjust it. The gap between the upper cover of the link head and the eccentric shaft should be adjusted.
Fifth, when you overhaul the bearings of the motor of the composite crusher, you can carry out the idling test by removing the V-belt. Listen if there is noise. If there is noise, you should judge if the bearing is damaged. Then you can check the situations in the terminal box of the motor.
Sixth, there is too much dust in the compound crusher. You should often the dust in the cooling fin of the motor so that the heat dissipation of the motor is effective. In addition, you should deal with the opening.
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Geothermal Resources Provide Space for Mining Industry

Geothermal resources can be divided into steam type, hot water type, ground-pressure type, hot and dry rock type and lava type five major categories according to the form of the storage. It is a renewable resource and a kind of new energy for the future development. According to the estimation of the scientists, the high temperature rock geothermal resource within 10km in the worldwide crust is 100 to 1000 times as the fossil energy in the whole world. Compared with the solar and wind, the geothermal energy of the high temperature rock mass is more concentrated, which makes the development and utilization become easy. The exploitation of the geothermal resources, especially the exploitation high temperature rock geothermal resources develops rapidly in developed countries.
The high temperature rock mass geothermal resources in China are very rich. The intense geological activity makes the development conditions excellent. The exploitation of the high temperature rock mass geothermal resources needs high-efficiency crusher machine, frilling temperature, and the test technology and equipment for the pressure and flow. The complete sets of technology and equipment with independent intellectual property rights for high temperature rock mass geothermal mining have provided new development room for the mining machinery industry.
Now the development of the mining machinery industry has become increasingly rising. With the gradual mining of the mine quarrying, the requirement for sustainable economic development has become a major topic. Mining machinery industry mainly uses the design principles with long service life, low energy consumption and reduction of the weight to minimize the emissions of the harmful and the damage to resources. Henan Hongxing Mining Machinery strengthens the device's own scientific and technological progress to continuously improve the work efficiency in the crushing process. At present, Henan Hongxing Mining Machinery has made great progress in terms of the green construction, the improvement for the self technology, environmental protection and the sustainable development. The mining products produced by Henan Hongxing Mining Machinery have the characteristics of high efficiency, stale operation and low energy consumption, which are favored by a lot of customers at home and abroad.
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Basic Knowledge about the Attrition of Jaw Crusher

If we can better understand the basic knowledge about the attrition of the jaw crusher, we can better use the jaw crusher.
First, we should know the reasons of the attrition of the jaw plate. The materials are repeatedly squeezed and the tooth plate is chipped. On the surface of the tooth plate area, the jaw plate may be easily to form the microcrack at the prominent part. The microcrack of the tooth plate of the crusher continuously expands to the connection, which will cause the falling off of the surface metal and form the debris. The materials are repeatedly squeezed, which causes the local crack or flips of the metal materials of the tooth plate. The fragmentation or flips part will form the debris together with the extruded materials. The materials slide with short stroke related to the tooth plate. The materials will cut the plate and form the debris.
How to solve the attrition of the jaw plate of the jaw crusher? From the above reasons, we can know that the affecting factors of the attrition of the jaw plate include the properties of the materials, the operating parameters and the material of the jaw plate. Since the specifications and the size of the jaw crusher are different and the feeding size is also different, the extrusion and impact force on the tooth plate and the materials selection are different. When you select the material of the jaw plate, Henan Hongxing Mining Machinery reminded that you should follow the two principles. First, you should select the materials with high hardness to resist extrusion and the micro-cutting failure. Second, you should select the materials with enough toughness to resist chipping impact fatigue failure.
Under normal circumstances, the squeeze pressure of the large and medium-sized jaw crusher is large. Beside the anti-extrusion and the anti-sliding cutting of the materials, you should also consider the impact force and bending stresses during the impact process. Therefore, for the large tooth plate, you should choose the materials with high toughness and good comprehensive performance. You can choose the high manganese steel or the alloy high-manganese steel. On the contrary, for the tooth plate of the small jaw crusher, you can choose the material with high hardness and appropriate toughness to improve the ability to resist extrusion resistance and micro-cutting.
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How to Maintain Rotor and Spindle of Hammer Crusher

The rotor and spindle are very important components for the hammer crusher. In this article, the experts of Henan Hongxing Mining Machinery will tell some basic knowledge about the maintenance tips of the rotor and spindle of the hammer crusher.
The rotor is a high-speed rotating part of the hammer crusher, which has great impact on the mechanical properties and safe operation of the whole machine. When the rotor works, the load acting on the rotor of the hammer crusher is moving load. When the force frequency is close to some natural frequency the structure, the spindle will produce strong resonance, which will cause damage or generate excessive deformation. Therefore, the spindle of the hammer crusher should have high static and dynamic characteristics.
The materials of the hammer crusher are fed into the machine from the upper feeding port. The materials are crushed through the blow, impact, shear, abrasive action of the hammer with high speed. When the production of the hammer crusher reduces, you should check whether the gap between the rotor and sieve is too large and timely adjust the spring bolt. If the rotor and sieve plate collide with each other, you should adjust the gap between the rotor and sieve. If the rotor is not balanced, you should re-arrange the ring hammer.
In terms of the spindle of the hammer crusher, the spindle is the main force component and operative part of the hammer crusher. Therefore, both requiring high precision and high stiffness are required. The main material should be the carbon steel and alloy steel. You can also use the thermal disposal or chemical heat treatment method to improve its wear resistance and fatigue strength. The hammer crusher is used to crush the hard stone. If the stress imposed on the spindle in the process of processing installation and work is uneven, the spindle will suffer from the eccentric force to gradually form the micro-crack on the particularly high stress part, which will cause sudden brittle fracture.
Therefore, we must pay special attention to the following matters. First, the straightening force applied should not be excessive to prevent the occurrence of chipping at the crack hidden of the spindle. Second, when the bending amount is too large, you should straighten it several times. Third, the correction values should be appropriately more than the bending value.
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The Comprehensive Inspection of the Impact Crusher

Regular inspection is very important for the impact crusher. How to comprehensively check the impact crusher?
First, we should check the plate hammer of the impact crusher. When the plate hammer of the impact crusher is worn to certain degree, you should timely adjust or replace the plate hammer to avoid the damage to the fasteners and other parts.
Second, we should check the liner of the impact crusher. Open the rack upper cover and dismantle the cotter pin, slotted nut and bolt used by the fixed liner of the impact crusher. Then you can replace the liner worn. If you install a new liner, you can reverse the steps above.
Third, in terms of the replacement of wearing parts of the impact crusher, you should first open the rack shelves. When you use it, you should first dismantle the coupling bolts between the rack upper shelves and the box. Then you can use the wrench twist it to the hex head portion of the clamshell device. Then the shelves will slowly be opened. In the meantime, you can use the hanging apparatus on the lower part of the rack. Repeat the above process, you will close the shelves.
Forth, the gap adjustment between the rotor of the impact crusher and the impact liner should be appropriate. When the rotor of the impact crusher is running, the gap between the impact liner and the rotor can not be adjusted. If the materials blocks are stranded between the counter plate and the plate and shell, you had better lift slightly the impact rack and re-adjust the gap. In this way, the materials blocks will become loose, and the impact rack is easy to be adjusted.
If the impact rack is insufficient, you can pat the relaxed rod with a board. The gap between the rotor and the impact liner should be completed by the adjustment device of the machine. First, you should loosen the bolt cover. And then you can turn the long nut. At this time, the straining beam will move in upward direction. After the adjustment, you can tighten the screw sets.
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Multiphase Flow Features of the Flotation Machine

Large inflatable mechanical mix type floatation machine can be roughly divided into four districts, namely the mixed zone, transport zone, separation zone and the foam area. This kind of flotation machine has the following characteristics.
First, the flow state of the internal gas solid-liquid multiphase flow in the tank of the flotation machine has non-symmetry. If the rotating speed is high, the inflation pressure will be great. The flow rate, volume fraction and turbulence intensity and other parameter distributions of each phrase are not symmetrical, which is related to the distribution and the flow speed of the gas phase volume fraction in the tank. If the volume fraction and the flow speed of the gas phrase in the tank is large, the distribution in the tank is not uniform, which makes the flow state of the gas liquid solid multiphase flow in the tank has certain non-symmetry.
Second, the large inflatable mechanical flotation machine is roughly divided into the mixed zone, transport zone, separation zone and foam area. The air into the impeller from the air distributor is in airflow state. In order to make the air form small bubbles and sufficiently disperse so that the bubble and the floating mineral particles have high probability of collision and form stable bubble, namely the mineral aggregates and the fully suspension of the mineral particles before entering the flotation transport region and the separation zone, the impeller and the guide vane need to form great turbulence intensity in the mixed zone.
Third, the transport region is the transition region between the mixed zone with high turbulence intensity and the separation zone with low turbulence intensity. In this zone, the turbulence intensity is gradually reduced in the axial direction, which is a relatively quiet region. Since the stripping probability of the mineral laden bubbles in the mixed zone is very high, this zone is a key zone mainly used to achieve the re-collision and adhesion of the bubbles and the ore particles.
Forth, the separation zone is a zone to complete the separation of the flotation of the mineral particles with actual purpose and the non-purpose mineral particles.
Fifth, the foam area is formed when the mineralized bubbles and non-mineralized bubbles rise to the separation zone from the slurry.
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Working Principles and Structure of Roller Crusher

With the rapid socio-economic development, the social demand and the production scale of a variety of metal materials, non-metal materials, cement, building materials and other materials gradually increase. In addition, the materials need crushing increase rapidly. Due to the shortage of energy and the increase of the processing costs, the traditional crushing equipment is confronted with some of the major problems to be studied and solved. This requires that we should research and develop the new generation of crusher equipment with high-productivity and low energy consumption. The research and analysis of the dynamics characteristics of the mechanical system is the premise and key of the development of all new machinery and equipment. The roller crusher produced by Henan Hongxing Mining Machinery has showed the powerful advantages and can meet the high production requirements at the same time.
The roll crusher produced by Henan Hongxing Mining Machinery has large crushing ratio without overload protection device or large and firm foundation, which can greatly save the investment on the machine and the infrastructure. The roller crusher can achieve the selective crushing and reduce overcrushing. The unit energy consumption is low and the roll crusher has the advantages of starting stopping with load. Therefore, this article will mainly analyze the dynamic characteristics of the roller crusher.
Specifically, we should first study the relative kinematics between the working principles and the working structure of the roller crusher to establish the kinematics model for the roll crusher. We can get the motion law of the crushing cone when the materials distribute without rule in the crushing cavity according to the analysis about the empty load state and the load state of the crusher machine. Through the analysis about the working parameters of the roller crusher, we can find out the impact of the systematic parameters on the performance of the crusher. Through the analysis and calculation about the crushing force of the roller crusher, we can know the impact of the hardness of materials, change of filling rate of crushing cavity, change of discharging port on the crushing force of the crusher machine. Through the analysis about the movement mechanism of the materials and the systematic crushing process, we can establish a systematic nonlinear dynamics model to get the vibration equation of the system of the materials. 
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Conditions Should Be Met of Particles in Rotary Kiln

Although the axial dispersion model (ADM) used to describe the movement process of the material in the rotary kiln can get some useful results, particle trajectory model descriptions starting from the granular dynamics is closer to reality for the movement of the materials with strong granulation in the rotary kiln. The particle trajectory model geometry is evolved from the idea of the single particle trajectory geometry simplified analysis. After the development of many scholars, random PTM model is formed to predict the average residence time of the material, the axial diffusion constant and other methods. The principles of the random PTM numerical simulation are the followings. Introduce a certain number of tracer particles in steady-state operation at the inlet end of the rotary kiln and calculate the total residence time of each particle in the kiln. At last, statistically analyze the residence time distribution for all the particles to get an average residence time and the variance, which respectively reflects the axial transport of the material in the rotary kiln and axial diffusion.
You should assume that the movement of the bed particles in the kiln can meet the following conditions. First, the bed particles are the spherical particles with uniform size but without viscid rigid body. The bed surface is a planar. There is no unevenness caused by unevenness due to the movement of materials. Second, the movement of the bad particles in the rotary kiln is composed of n repeated cycles. Each cycle is composed of the tumble process of the materials in the active layer of the surface of the material bed and the particle circular motion in the inactive layer. Third, the thickness of the active layer is very thin. The mutual movement between the material particles occurs only in the surface of the material bed surface. There is no mutual movement of the particles in the non-active layer. The axial displacement of the material particles only occurs only on the surface of the material bed, which has nothing to do with the circular motion of the particles in the inactive layer. Forth, the air in the rotary kiln has no impact on the bed particles.
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Efficiency and Length of Screen Surface of Screen

The sieving equipment is widely used to make the bulk substance is divided into two or more levels of granularity. The vibrating screen is the most common screen equipment used in the mining industry. The development and the problems of the domestic large-scale screening equipment started from the 1970s. We have done a lot of work and made great achievements in terms of the development of large-scale screening machine. For the screening machinery, the length and width of the screen surface are two important structural parameters we should carefully consider. They are the first two problems encountered in the design and selection of the screening machine. According to the screening theory, the width of the screen surface is associated with the processing capability of the screening machine.  Under the same conditions, if the sieve surface is wide, the processing capacity will be great. The length of the sieve surface is associated with the screening efficiency. Under the same conditions, to appropriately lengthen the sieve surface can improve the screening efficiency. However, according to the mechanism of the probability sieving, with the lengthening of the sieve surface, the particle size whose diameter is greater than the separation particle diameter increases which makes the screening efficiency decrease. From the above analysis, we can know that the there is an optimal value for the screen surface to make the screening efficiency to be the highest.
Based on the probability statistics, we can establish the model, which can better reflect the through screen probability of the particles along the long direction of the sieve, which provides certain theoretical basis for the design of the probability screen. We can deduce the formula of the through screen probability for the particles along the sieve. However, the formula is too complex. In addition, the formula does not directly point out function relationship between the efficiency and the length of the sieve. It is extremely inconvenient in the industrial application.  The experts of Henan Hongxing Mining Machinery use the three-dimensional discrete element method to simulate the probability of screening process and establish the function relationship between the screening efficiency and the length of the screen surface, which is more convenient and simple.
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Ways to Improve Working Efficiency of Cone Crusher

At present, in domestic mining machinery industry, the spring short-head cone crusher can the hydraulic cone crusher are most widely used. These devices have been in use for decades. The technology is backward, which mainly displays in the following areas. First, the granularity of the crushed products is coarse, which is generally from 20 to 30 mm. Second, the main parameters of the crusher and the design of the crushing chamber are not reasonable. The utilization rate is low and the energy consumption and steel consumption is large. Third, the level of automation is low. There are no practical and reliable means for detection. The auxiliary equipment is old-fashioned.
The crushing machinery at abroad developed rapidly in these years. New types of machines have been brought. The ultra-crushing crusher introduced recently is particularly significant. The great characteristics of these crushers are small particle size, high processing capacity. The auxiliary equipment is advanced with high level of automation.
In recent years, many experts have taken measures to improve the cone crusher. For example, we can increase the length of the parallel area, narrow the discharging port and increase the revolutions of the eccentric bushings. Although these measures also achieved a certain effect, they are very restrictive. The measures are difficult to be promoted and applied. After deep study, the experts of Henan Hongxing Mining Machinery have put forward some effective measures to improve the cone crusher.
We can improve the design of the crushing cavity and   choose the main parameters for optimization. The shape of the crushing cavity plays very important role in production capacity, energy consumption, service life of liners and the particle and the shape of the finished products. Therefore, the technology of the crushing cavity is also called the technological core of the crushing machine. The main parameters, such as the eccentricity and the rotating speed of the eccentric sleeve are closely related to the shape of the crushing cavity.
The improvements of the crushing chamber mainly include the followings. First, you can shorten the parallel zone and increase the length of the crushing area in the parallel area. Second, change the straight line connection of the crushing surface of the fixed cone to the connection of straight line and the curve. Stagger the connecting point of the movable cone and the fixed cone to reduce the possibility of the block.
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Development of Nonmetallic Mineral Grinding Technology

The modern engineering technology will need more and more high-purity and ultra-fine powder. The ultrafine grinding technology will play increasingly important role in high-tech research and development. The high-tech industries are closely linked the non-metallic minerals. We should consider the development of high-tech industry in the future non-metallic mineral processing technology and industrial development. The modern non-metallic deep processing technology and traditional industries processing technology mutual infiltrated each other. In the development, you must consider the transformation of traditional industries and the progress. You must consider the comprehensive utilization in order to better apply the limited number of non-metallic mineral resources. At the same time, in the development and utilization of the deep process, we must also consider human survival and sustainable development and pay attention to environmental protection.
The general future trend of non-metallic mineral raw materials or materials is to develop the high-purity, ultra-fine and functional ultrafine grinding technology. We should comprehensively use the various non-metallic minerals based on the high-purity and ultrafine non-metallic mineral deep processing of raw materials. The chemical synthesis can be used in making high-purity and ultrafine powder, but it has not been widely used in the industrial production due to the high cost. The mechanical crushing method is still the main way to obtain the ultrafine powder. The ultrafine crushing technology and the grading technology depended by the mechanical method become more and more difficult. The studying depth is endless. The ultrafine grinding technology is the comprehension of the multifaceted technology. The development depends on the progress of the related technology, such as the processing of the hard and high-toughness wear-resistant components and the distribution test of the high-speed bearings and the submicron particle size. Therefore, the development of ultra-fine grinding technology should focuse on the following aspects.
First, we should develop the fine grading equipment and other corollary equipment. The closed-circuit technology combined with the ultra-fine grinding and classification equipment can improve the production efficiency and reduce energy consumption.
Second, we should improve efficiency and reduce the energy consumption to continue to enhance and improve the ultrafine grinding equipment. We should design the classifier with advanced technology.
Third, the research and development of equipment and technology should be integrated.

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Development of Nonmetallic Mineral Grinding Technology

The modern engineering technology will need more and more high-purity and ultra-fine powder. The ultrafine grinding technology will play increasingly important role in high-tech research and development. The high-tech industries are closely linked the non-metallic minerals. We should consider the development of high-tech industry in the future non-metallic mineral processing technology and industrial development. The modern non-metallic deep processing technology and traditional industries processing technology mutual infiltrated each other. In the development, you must consider the transformation of traditional industries and the progress. You must consider the comprehensive utilization in order to better apply the limited number of non-metallic mineral resources. At the same time, in the development and utilization of the deep process, we must also consider human survival and sustainable development and pay attention to environmental protection.
The general future trend of non-metallic mineral raw materials or materials is to develop the high-purity, ultra-fine and functional ultrafine grinding technology. We should comprehensively use the various non-metallic minerals based on the high-purity and ultrafine non-metallic mineral deep processing of raw materials. The chemical synthesis can be used in making high-purity and ultrafine powder, but it has not been widely used in the industrial production due to the high cost. The mechanical crushing method is still the main way to obtain the ultrafine powder. The ultrafine crushing technology and the grading technology depended by the mechanical method become more and more difficult. The studying depth is endless. The ultrafine grinding technology is the comprehension of the multifaceted technology. The development depends on the progress of the related technology, such as the processing of the hard and high-toughness wear-resistant components and the distribution test of the high-speed bearings and the submicron particle size. Therefore, the development of ultra-fine grinding technology should focuse on the following aspects.
First, we should develop the fine grading equipment and other corollary equipment. The closed-circuit technology combined with the ultra-fine grinding and classification equipment can improve the production efficiency and reduce energy consumption.
Second, we should improve efficiency and reduce the energy consumption to continue to enhance and improve the ultrafine grinding equipment. We should design the classifier with advanced technology.
Third, the research and development of equipment and technology should be integrated.

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The Device and the Rotor of Impact Crusher Device

The role of the impact device is to withstand the impact of the materials knocked out by the plate hammer and rebound the materials crushed by the impact device to the hammering area for further crushing to ensure the reasonable and normal operation of the whole impact process to get the required particle size finally. Therefore, the type and the shape design of the impact device not only has an impact on the effective volume of the crushing chamber, but also directly affects the crushing efficiency of the impact crusher. By observing the surface shape of the impact plate of the impact crusher at home and abroad, we find that the impact plate can be divided into the polyline and round solitary type. The impact plate can be divided into the two kinds of impact surface, namely the forward type and backward type.
The first is the involute linear impact surface. In theory, all the reasonable impact surfaces should be the in the involute shape to ensure that the materials knocked out from the plate hammer can vertically crash the impact surface to get the best crushing effect. Since the manufacturing of the involute impact surface is very hard and the material blocks crash and disturb each other in the crushing cavity so that the flight path has been irregular. As a result, the involute impact plate has lost the practical significance to a considerable extent. Therefore, in the design process and manufacturing process of the impact crusher, we often use the fold-line impact surface which approximates the involute to replace the involute. However, in the design process, we should note that the ore blocks should move forward the discharging area to reduce the useless power consumption of the material blocks in the crushing cavity, which is called the forward impact surfaces.
The second is the circular arc-shaped impact surface. The circular are-shaped impact surface has the following characteristics. The material blocks which get the impact energy from the plate hammer fly on the impact surface and they are rebounded by the impact plate. Then the material blocks will focus at the center point of the counter surface. In this way, the material blocks with different weight, shape and flight speed generate strong impact near the center.

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Wireless Temperature Monitoring System of Rotary Kiln

There are a lot of reasons to lead to the damage of the riding wheel of the rotary kiln. If the problems are not handled in a timely manner, the serious consequences will be caused. There is some practical experience summarized by the experts of Henan Hongxing Mining Machinery in the following paragraphs.
First, the plastic blocks purchased each time are produced by different manufacturers, but the situation is basically the same. The breakage of parts and the time are the same, which fully shows that the quality is not the reasons for the damage of the plastic blocks.
Second, the speed changes of the rotary kiln are too frequent so that the load withstood by the plastic blocks also changes frequently. As a result, the shearing force will increase or decrease. When the rotary kiln starts or stops, this kind of change is especially obvious.
Third, from the coupling assembly of the plastic blocks, we can know the followings. In the rotation of the rubber blocks, the parts which contact the rubber block and produce the extrusion are the convex claw on the movable half coupling and the groove on the fixed half coupling recess.
In the actual use, you should prepare the specialized tools to process the temperature rising problems of the rotary kiln. The tools should be placed separately. Sometimes, the temperature rising appear suddenly. If we miss the best time to deal with the temperature rising problems, very serious consequences will appear. 
Thermostats wind plays a different role in the different stages of the firing process. Therefore, the control is very complex. However, the thermostat wind affects the kiln atmosphere and the uniformity of the kiln temperature. As a result, it can be said thermostat air control is very important part in the rotary kiln control. In the concrete realization of the process, we should bypass the function variability of the thermostat itself. In the whole firing process of the rotary produced by Henan Hongxing Mining Machinery achieves the completely automatic wireless control and the control effect is good.
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Development Direction of Dupry Process of Rotary Kiln

Roughly speaking, the dupry process of the rotary kiln has got great development in the past five years. The development of the dupry process of the rotary kiln has changed the situation of low working efficiency and high production cost. The dupry process of the rotary kiln has been in the industry on a firm pace, which is capable of producing hundreds of tons of industrial production. According to the situation based on the past few years, you can see the following characteristics.
First, the dupry process of the rotary kiln is developing towards large scale. Henan Hongxing Mining Machinery has put into the large rotary whose diameter is 6 meters and length is 70 meters with a chain grate of 250 meters. The annual output is 350,000 tons. After that, another plant put the large rotary kiln whose diameter is 60 meters and length is 125 meters into operation. The annual production capacity has reached 400,000 tons. The design capacity has reached 83%.
Second, due to the needs of the dust for the large steel plant, the rotary kiln is successfully used in the pre-reduction of the blast furnace, which has become the auxiliary means of production of the blast furnace.
Third, the rotary kiln law continues to be improved. After years of research, Henan Hongxing Mining Machinery has designed a new generation of rotary kiln which can be used by the combination of the gaseous reducing agent and the solid liquid gas reducing agent.
Forth, the rotary kiln used for processing the titanomagnetite has been designed. The waste gas from the rotary kiln is introduced to the air through the back combustor for full fully burn so that the iron and the ash with large particles can sink. The gas after burn is cooled by the cooling tower with the high-pressure water spray to 285 ° C. When the production reached 83%, the design capacity and exhausting fan capacity has reached saturation. At present, the experts are studying the ways to reduce the consumption. The purpose of the automatic control of the kiln is to study the control system of the kiln to ensure that the automatic control is easy to be achieved.
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Structure and Working Principle of Spiral Classifier

The spiral classifier is composed by the transmission, spiral, sink, feed mouth, water drain valve, elevator mechanism, fluctuation bearing seat and other main components. The transmission drives the rotation of the hollow shaft by the motor through V-belt pulleys, reducers, the open gear or basin-shaped gear. There are bracket, leaves and lining iron installed on the hollow, which form a spiral with a lead angle. The hollow axis is made of the whole seamless steel tube. When the helix diameter is more than 1500mm, the hollow shaft can be made of the steel plate roll whose mechanical property is not lower than 16Mn. The two ends of the spiral are respectively supported on the upper part and the lower part of the bearing seat. There is liner iron made of wear-resisting iron edged at the outer edge of the spiral. It is easy to replace the lining iron after it is worn. The sink is the steel plate and steel welded structure and the thickness of the steel plate is 4mm to 8mm. The groove bottom is in semicircle which can match with the outer diameter of the spiral. There is feed inlet on the side of the spiral. There is discharging opening at the bottom of the upper end of the tank.
Since the water drain valve is closed, the level segment of the spiral classifier will form a slurry pool. In terms of the lifting mechanism of the spiral classifier, the small grading machine uses the manually screw wheel to lift spiral through the wire rope. The large spiral classifier uses the motor to drive the lifting mechanism of the screw rod. In the emergency stop or maintenance, you can operate the lifting mechanism to make the lower end of the spiral rise. The spiral classifier does not allow the heavy-duty start. The lower support base is linked through the flange and the hollow shaft. Since the lower support seat long is immersed in the slurry, there must be good seal apparatus and lubrication conditions. The supporting bearing can be divided into rolling bearing and plain bearing. The former uses the mechanical seal device, while the latter uses the pressure water sealing device.
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Types of the Construction Stone Production Line

The highway projects often use the massive stone production line, which is generally processed by the mining natural rocks. Sometime, the natural pebbles are used. The stone production line should select the hard rock whose calcarea is uniform and not easily weathered without cracks. For the rocks with anisotropy and cleavage, we should correctly grasp the anisotropy and the cleavage, which is very important for massive stone production line in the mining, processing and use of the highway projects. The stones with inordinance can be directly obtained through blasting. The size from a direction is generally 30cm to 40cm, in which the thickness of the medium part should not less than 15cm. The volume should not be less than 0.01m3 and the weight should be more than about 30kg.
The rubble is commonly used in the masonry of the subgrade slope, retaining walls, bridge slope protection and other projects. The ultimate compressive strength of the rubble used for the subject of the masonry work should not be less than 30MPa. The ultimate compressive strength used for subsidiary masonry works should not be less than 20MPa. The rubble is obtained by blasting the layered rock or relying on the manual mining, which is commonly used in masonry bridge foundation. The dimension stone is in square shape without sharp corners. There are two large parallel surfaces and the corners need no processing. The thickness is small than 20CM and the width is 1.5 to 2 times of the thickness. The length is 1.5 to 3 times of the thickness. The dimension stone is obtained by roughly trimming the neat stone. The shape is substantially a squarer and the thickness is not less than 20mm. The conical stone is often used for paving the road pavement of the grassroots. The rock whose ultimate compressive strength is not less than 30MPa is generally used.
The aggregate production line can be divided into coarse gravel, fine gravel and the stone chips. The particle size of the aggregates in the stone production line is generally in the range of 5mm to 100mm. The highway engineering has different specifications with gravel according to different uses.
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