The structural part of the ball mill, the ball mill is divided into various types due to different specifications, unloading and transmission methods, but its main structure is basically the same, the main can be divided into three types, lattice type ball mill structure, overflow Type rod mill structure, tube mill structure.
The top experts of Zhengda Zhongke said at the scientific conference:
The structural part of the ball mill, the ball mill is divided into various types due to different specifications, unloading and transmission methods, but its main structure is basically the same, the main can be divided into three types, lattice type ball mill structure, overflow Type rod mill structure, tube mill structure. The ball mill is mainly composed of a cylindrical cylinder, a lining plate, a partition plate (available in a multi-cylinder mill), a main bearing, an inlet and outlet device, and a transmission system.
The barrel of the ball mill is one of the main working parts of the ball mill. When the cylinder is in operation, it is subjected to the impact of the grinding body in addition to the static load of the grinding body, and the cylinder is rotated, so that alternating stress is generated on the cylinder. Therefore, it must have sufficient strength and rigidity. This requires that the metal material used to manufacture the cylinder has high strength, good shape, good mechanical properties and process performance to ensure the safe operation of the mill barrel. Generally, the material used for the manufacture of the cylinder is ordinary structural steel. The strength, plasticity and weldability of the material can meet the requirements. With the development of the industry, the grinding capacity (yield) is also developed to a large scale, and recently designed. The barrel of the large mill is made of 16mn steel. 16mn also has good machinability, weldability, wear resistance and fatigue resistance. So 16mn is a fairly suitable steel. The length of the barrel is different when the ball mill is running and when it is stopped for a long time. This is caused by thermal expansion and contraction caused by different cylinder temperatures. Therefore, the design of the thermal expansion and contraction of the cylinder must be taken into account in the design, installation and maintenance. In order to ensure the normal meshing of the gear, no axial turbulence is allowed at the discharge end, so there is a structure suitable for axial thermal variability at the feeding end. The axial thermal deformation of the cylinder has two considerations on the structure of the mill: one is to consider the reserved clearance between the shoulder of the hollow journal and the bearing. The other is to horizontally install a plurality of steel bars between the bearing housing and the bottom plate. When the cylinder is inflated and contracted, the bearing end of the feeding end can move along the stick. A grinding door (also called a hole) should be opened for each bin on the cylinder. The function of the grinding door is to insert the lining plate, the partition plate, fill or pour out the grinding body and stop grinding to check the condition of the grinding machine bin. The main bearing of a ball mill is most commonly a plain bearing, which has a large diameter but a short length. The bearing pads are cast in Papillon gold. The difference from a plain sliding bearing is that only the lower half has a bearing bush. The entire bearing is made of cast steel except that the bearing pad is cast with babbitt. Due to the large span and load of the ball mill, a certain degree of winding will occur, and the manufacturing and device errors are difficult to ensure accurate coaxiality. Therefore, the bearing is made into an automatic positioning type, a spherical tile seat and a spherical tile seat. The center of rotation of the ball can be slightly moved relative to each other, so that the load distribution on the bearing pad is uniform.
There are no locating pins between the spherical tile seat and the spherical tile seat to limit the extent to which the spherical tile moves. When installing, you can use the nail to adjust the position of the spherical tile seat. Also useful with wedges. The main bearing is a key component of the ball mill. It must pay full attention to the lubrication problem. Generally, it is concentrated lubrication with thin oil. Some small machines also use oil ring lubrication, oil ring oil lubrication or wool lubrication.
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