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Four-tooth roll crusher is an important mining machinery, mainly used in coal mines or coal preparation plants and other industrial and mining enterprises for raw coal crushing, also suitable for other similar hardness of the material crushing.
Four-tooth roll crusher is an important mining machinery, mainly used in coal mines or coal preparation plants and other industrial and mining enterprises for raw coal crushing, also suitable for other similar hardness of the material crushing.
1.Working principle and structure
Raw coal enters the crusher chamber through the inlet, and enters between the two upper crushing rolls under the effect of gravity. The upper rolls are driven by the power to do relative rotation, the use of roller teeth and buffer cylinders on the crushing rolls of the compression force on the material for crushing. After the initial crushing of the material under the action of gravity continue to fall to the lower section of the crushing rollers, the same principle of work on the material to be crushed again. The crushed material is discharged through the discharge port. As the crushing effect of the rolls is mainly splitting, so the crushed materials are even in particle size and less powder. Due to the double-section crushing, the crushing ratio can reach more than 6. Four roll crusher mainly consists of main and sub-drive gear box, machine shell, machine base, crushing roller, gas P-liquid buffer cylinder and motor and other major components. The main and sub-drive gearboxes are rigidly connected with the upper and lower crusher through the clamping coupling to form an integral gear transmission device. The motor is driven by the small pulley and the triangular belt to drive the main shaft of the main transmission gearbox, and the connection between the large pulley and the main shaft has no overload safety pin device to protect the motor in case of overload [1].
The main shaft of the main drive gearbox transmits the power of the motor to the fixed crushing rolls in the upper and lower sections through gears. The secondary transmission gear box is the upper and lower fixed crushing rollers to pass the power through the gear bridge to each section of the movable crushing rollers, the gear bridge can be changed with the spacing of each section of the crushing rollers and change the spacing of its input and output shafts, so as to make the transmission of power will not be interrupted and the transmission of gears is normal. The main and secondary transmission gearboxes are equipped with movable bearings and their sliding guides to meet the movable crushing rollers to adjust the roller distance or crushing operations.
The housing is designed as a warehouse-like compartment to accommodate all sections of crushing rollers and materials for crushing, which is combined by front, middle, back, top and bottom covers, with different thicknesses of steel plates according to the wear parts. It is easy to dismantle the cover and unload and load the rolls when overhauling the rolls. The shaft opening of each crushing roll is equipped with a coal block to prevent coal particles from overflowing from the opening. The upper and lower crushing rolls are made of specially designed flake-shaped toothed rings stacked on top of each other to replace unevenly worn parts as needed, thus prolonging the service life of the crushing rolls. The teeth of the upper rolls are designed to capture large pieces of material easily, while the teeth of the lower rolls are designed to crush the material to the required uniform size.
Role of mechanical pitch adjustment and gas buffer cylinder.
(1)The pitch adjustment of each section of crushing rolls is carried out by the screw nut, which can change the different product size, and there is a chain sprocket device between the screw pitch adjustment mechanism, which is used to synchronise the action of the left and right pitch adjustment screws. When the roller distance adjustment to the requirements of the application of chain lock lock chain, so that the working distance of the crushing roller lock.
(2)The pressure generated by compressed nitrogen on the piston exerts a certain compression force on the crushing rollers, thus making the crushing rollers crush the materials.
(3) Occasionally, when there are non-crushable materials entering the crusher, the compressibility of nitrogen in the air chamber of the buffer cylinder will produce an avoidance action, so that the impact force can be relieved and the protection of the machine parts to avoid damage.
The machine base is the load-bearing and mounting base part of the crusher. The main parts of the crusher, such as the main and sub-drive gearboxes and the machine shell, are mounted directly on the machine base to form the crusher as a whole. The machine base is made of steel sections and plates welded together to form a rigid structure, and its mounting reference surfaces are machined to ensure the accuracy of the installation of the main and sub-drive gearboxes.
2.Installation and Maintenance
The crusher can be installed directly on the concrete foundation or metal beam frame. The location and size of the ground bolts should be according to the information provided by the crusher manufacturer. The crusher should not be installed on an uneven foundation surface. Uneven foundation surface will cause the crusher's base to twist and deform, leading to the deterioration of the working condition of the gears in the main and sub-drive gearboxes. Therefore, after the installation of the crusher, the level of the base of the machine should be checked, and the permissible error should not be more than 2 mm.
2.2 Use and Maintenance
No matter how to feed the crusher, there must be a reliable rust removal device to prevent other miscellaneous matters from entering the crusher. The crusher must be started with no load. Before starting, the crusher must be checked and cleared of any remaining material. Check the oil level in the main and auxiliary drive gearboxes and supply sufficient oil. If the crusher has been out of use for a long time, or for the first time to start the crusher, it should be manually rotated for 2-3 weeks to make sure that the machine is running freely, and then the motor should be "pointing" for several times, and then the crusher should be started only after the motor is rotating in the right direction. Start the crusher to reach the normal speed, and in no abnormal situation to start feeding. Sample the crusher regularly to check whether the product size meets the requirements. If necessary, readjust the spacing of the crushing rolls. When stopping the crusher, stop feeding the material beforehand, and stop the crusher only after all the material in the crusher has been removed. When changing the strength, grain size or crushing ratio of the crusher material, the nitrogen pressure in the buffer cylinder should be readjusted. The pressure should be set at a level that meets the needs of the crushing roll compression force. Excessive compression force will result in faster wear and increased power consumption. Too small compression force will make the crushing product of the super-grain increase, and make the activity of the crushing rollers show frequent vibration jump phenomenon.
The crusher's main and sub-drive gearboxes are lubricated with gear oil, and the lubricating oil in the box should be replaced in time during summer and winter. According to the design requirement, H L-30# gear oil (SY1103-77) is used in summer and H L-20# gear oil in winter. The bearings of the upper and lower crushing rolls of the crusher are lubricated with grease, and the design requires the use of 2# or 3# calcium-based grease. If it is necessary to open the cover of the primary and secondary transmission gearboxes for maintenance, the rubber sealing strips must be replaced and a layer of sealant must be evenly applied to the static sealing surfaces before reassembly to prevent oil seepage and oil leakage from the sealing surfaces. After the crusher is overhauled, when reassembling the upper section of the crusher rolls and the nip shell coupling, the round nuts and coupling bolts should be tightened under strict control of the torque. Tighten the shell coupling bolts, but also must pay attention to its sequence, should first tighten the diagonal bolts, and then tighten the middle bolts, at the same time pay attention to the coupling on both sides of the sub-surface gap should be uniform.
Four-tooth roller crusher is an important mining machinery, mainly used in coal mines, coal plants and other industrial and mining enterprises for raw material crushing. Introducing the working principle and structural characteristics of the four-tooth roller crusher, and the installation of this machine, the use of the technical requirements of maintenance, the effective use of machinery and equipment for coal processing plant and improve labour productivity is of great significance.
Previous: SMP Crusher
Next: SMP Crusher
Four-tooth roll crusher is an important mining machinery, mainly used in coal mines or coal preparation plants and other industrial and mining enterprises for raw coal crushing, also suitable for other similar hardness of the material crushing.
Four-tooth roll crusher is an important mining machinery, mainly used in coal mines or coal preparation plants and other industrial and mining enterprises for raw coal crushing, also suitable for other similar hardness of the material crushing.
1.Working principle and structure
Raw coal enters the crusher chamber through the inlet, and enters between the two upper crushing rolls under the effect of gravity. The upper rolls are driven by the power to do relative rotation, the use of roller teeth and buffer cylinders on the crushing rolls of the compression force on the material for crushing. After the initial crushing of the material under the action of gravity continue to fall to the lower section of the crushing rollers, the same principle of work on the material to be crushed again. The crushed material is discharged through the discharge port. As the crushing effect of the rolls is mainly splitting, so the crushed materials are even in particle size and less powder. Due to the double-section crushing, the crushing ratio can reach more than 6. Four roll crusher mainly consists of main and sub-drive gear box, machine shell, machine base, crushing roller, gas P-liquid buffer cylinder and motor and other major components. The main and sub-drive gearboxes are rigidly connected with the upper and lower crusher through the clamping coupling to form an integral gear transmission device. The motor is driven by the small pulley and the triangular belt to drive the main shaft of the main transmission gearbox, and the connection between the large pulley and the main shaft has no overload safety pin device to protect the motor in case of overload [1].
The main shaft of the main drive gearbox transmits the power of the motor to the fixed crushing rolls in the upper and lower sections through gears. The secondary transmission gear box is the upper and lower fixed crushing rollers to pass the power through the gear bridge to each section of the movable crushing rollers, the gear bridge can be changed with the spacing of each section of the crushing rollers and change the spacing of its input and output shafts, so as to make the transmission of power will not be interrupted and the transmission of gears is normal. The main and secondary transmission gearboxes are equipped with movable bearings and their sliding guides to meet the movable crushing rollers to adjust the roller distance or crushing operations.
The housing is designed as a warehouse-like compartment to accommodate all sections of crushing rollers and materials for crushing, which is combined by front, middle, back, top and bottom covers, with different thicknesses of steel plates according to the wear parts. It is easy to dismantle the cover and unload and load the rolls when overhauling the rolls. The shaft opening of each crushing roll is equipped with a coal block to prevent coal particles from overflowing from the opening. The upper and lower crushing rolls are made of specially designed flake-shaped toothed rings stacked on top of each other to replace unevenly worn parts as needed, thus prolonging the service life of the crushing rolls. The teeth of the upper rolls are designed to capture large pieces of material easily, while the teeth of the lower rolls are designed to crush the material to the required uniform size.
Role of mechanical pitch adjustment and gas buffer cylinder.
(1)The pitch adjustment of each section of crushing rolls is carried out by the screw nut, which can change the different product size, and there is a chain sprocket device between the screw pitch adjustment mechanism, which is used to synchronise the action of the left and right pitch adjustment screws. When the roller distance adjustment to the requirements of the application of chain lock lock chain, so that the working distance of the crushing roller lock.
(2)The pressure generated by compressed nitrogen on the piston exerts a certain compression force on the crushing rollers, thus making the crushing rollers crush the materials.
(3) Occasionally, when there are non-crushable materials entering the crusher, the compressibility of nitrogen in the air chamber of the buffer cylinder will produce an avoidance action, so that the impact force can be relieved and the protection of the machine parts to avoid damage.
The machine base is the load-bearing and mounting base part of the crusher. The main parts of the crusher, such as the main and sub-drive gearboxes and the machine shell, are mounted directly on the machine base to form the crusher as a whole. The machine base is made of steel sections and plates welded together to form a rigid structure, and its mounting reference surfaces are machined to ensure the accuracy of the installation of the main and sub-drive gearboxes.
2.Installation and Maintenance
The crusher can be installed directly on the concrete foundation or metal beam frame. The location and size of the ground bolts should be according to the information provided by the crusher manufacturer. The crusher should not be installed on an uneven foundation surface. Uneven foundation surface will cause the crusher's base to twist and deform, leading to the deterioration of the working condition of the gears in the main and sub-drive gearboxes. Therefore, after the installation of the crusher, the level of the base of the machine should be checked, and the permissible error should not be more than 2 mm.
2.2 Use and Maintenance
No matter how to feed the crusher, there must be a reliable rust removal device to prevent other miscellaneous matters from entering the crusher. The crusher must be started with no load. Before starting, the crusher must be checked and cleared of any remaining material. Check the oil level in the main and auxiliary drive gearboxes and supply sufficient oil. If the crusher has been out of use for a long time, or for the first time to start the crusher, it should be manually rotated for 2-3 weeks to make sure that the machine is running freely, and then the motor should be "pointing" for several times, and then the crusher should be started only after the motor is rotating in the right direction. Start the crusher to reach the normal speed, and in no abnormal situation to start feeding. Sample the crusher regularly to check whether the product size meets the requirements. If necessary, readjust the spacing of the crushing rolls. When stopping the crusher, stop feeding the material beforehand, and stop the crusher only after all the material in the crusher has been removed. When changing the strength, grain size or crushing ratio of the crusher material, the nitrogen pressure in the buffer cylinder should be readjusted. The pressure should be set at a level that meets the needs of the crushing roll compression force. Excessive compression force will result in faster wear and increased power consumption. Too small compression force will make the crushing product of the super-grain increase, and make the activity of the crushing rollers show frequent vibration jump phenomenon.
The crusher's main and sub-drive gearboxes are lubricated with gear oil, and the lubricating oil in the box should be replaced in time during summer and winter. According to the design requirement, H L-30# gear oil (SY1103-77) is used in summer and H L-20# gear oil in winter. The bearings of the upper and lower crushing rolls of the crusher are lubricated with grease, and the design requires the use of 2# or 3# calcium-based grease. If it is necessary to open the cover of the primary and secondary transmission gearboxes for maintenance, the rubber sealing strips must be replaced and a layer of sealant must be evenly applied to the static sealing surfaces before reassembly to prevent oil seepage and oil leakage from the sealing surfaces. After the crusher is overhauled, when reassembling the upper section of the crusher rolls and the nip shell coupling, the round nuts and coupling bolts should be tightened under strict control of the torque. Tighten the shell coupling bolts, but also must pay attention to its sequence, should first tighten the diagonal bolts, and then tighten the middle bolts, at the same time pay attention to the coupling on both sides of the sub-surface gap should be uniform.
Four-tooth roller crusher is an important mining machinery, mainly used in coal mines, coal plants and other industrial and mining enterprises for raw material crushing. Introducing the working principle and structural characteristics of the four-tooth roller crusher, and the installation of this machine, the use of the technical requirements of maintenance, the effective use of machinery and equipment for coal processing plant and improve labour productivity is of great significance.
Previous: SMP Crusher
Next: SMP Crusher
