Hammer crushers are mainly used for medium or fine crushing of medium-hard materials in daily work. In work, under normal circumstances, the hammer crusher can work smoothly and normally, and the wear and tear are normal wear and tear. However, if the material is mixed with high-hardness materials, accidental crushing may occur, and even the main shaft and bearings may be damaged in severe cases. Under normal circumstances, the vulnerable parts of the hammer crusher include: hammer head, hammer frame, grate bar, liner and so on.
Common hammer crusher wear parts
Hammer Crusher Wear Parts–Hammer
The hammer head of the hammer crusher is the main consumable part. At present, the high manganese steel hammer head is mainly used. When one side is worn, it can also be turned over for use. However, when the two sides of the hammer head are severely worn, it will be difficult to repair, and its wear resistance is relatively poor. Therefore, the degree of work hardening of the high manganese steel hammer head is very little in the work and production, and its working conditions basically belong to the low stress and multiple impact chisel material wear.
Hammer Crusher Wear Parts–Hammer Frame
The hammer frame is made of cast steel, and generally does not directly contact the material, but the side hammer of the hammer frame and the side plate of the casing are subject to material wear by chiseling. In addition, the shaft hole of the hammer head on the hammer frame, after the crusher has been working for a long time, the round hole will be worn into an oblate hole, which will affect the normal work of the hammer head.
The method of repairing the hammer frame is to carry out surfacing welding with manganese steel surfacing electrodes. After the shaft hole of the hammer head is worn out, after repair welding and annealing, re-mark and drill the holes, or recombine the hammer frame disk group and then carry out boring. After that, it is easier to meet the accuracy requirements of the size.
Hammer Crusher Wear Parts–Grate
Due to the impact and friction of the material, the grate bars of the hammer crusher wear relatively quickly, and sometimes even bend and break. The worn grate bars can be repaired by surfacing welding. When repairing, pay attention to the space between the grate bars. gap size. Cracked grating bars can also be repaired by welding. When repairing, attention should be paid to the smoothness of the weld surface; however, bent and broken grating bars generally need to be replaced with new ones.
Hammer Crusher Wear Parts-Liner
The liner is mostly made of high manganese steel, and the liner wear can also be repaired by surfacing welding. At the same time, in order to save manganese steel surfacing electrodes, the bottom layer can be surfacing with steel electrodes first, and then the surface layer can be surfacing with manganese steel electrodes.
When the wear is relatively thin, manganese steel electrodes can be directly used for uniform surfacing. In order to save surfacing welding rods and save time, intermittent surfacing welding can be made into strips and meshes on the liner, but the intermittent gaps should not be too dense or too sparse. Too dense will save time and electrodes, and too sparse will not work. to repair.
Hammer Crusher Wear Parts | Common Faults and Solutions
Hammer Crusher Wear Parts – Hammer Head Faults and Solutions
During the working period of the hammer head, in addition to being impacted, it will also be impacted by materials. The failure mode is mostly impact chisel, and there will also be cutting wear. Long-term repeated use in this way will damage the working surface of the hammer head, causing changes in the surface shape and even fractures. Wear is normal, but breakage of the hammer head is not normal.
There are two main reasons for breakage and wear: one is a breaker made of high-toughness materials as a whole, which has good impact resistance but is not wear-resistant; the other is a crusher made of wear-resistant materials as a whole. Such wear resistance is better, but not impact resistance.
The treatment method is to use a bimetallic alloy hammer head with reasonable material selection and well-controlled processing technology. The hammer handle of this hammer head and the bonding layer of the hammer head are combined into a whole through a special manufacturing process to form a metallurgical bond with high interface bonding strength. , At the same time, it also makes the breaker have a fine structure, which will greatly improve the service life of the breaker, especially on large crushers.
Hammer Crusher Wear Parts – Hammer Frame Faults and Solutions
The hammer frame is used to hang the hammer head. It does not have the function of crushing materials in the crusher, but during the operation of the hammer crusher, the hammer frame will contact with the material and cause wear, so the material requirement of the hammer frame must be wear-resistant.
The hammer frame of the hammer crusher is made of cast steel, which has less contact with the material, but normal wear and tear will still occur. Usually, there will be falling of materials in the crusher, or the liner may also fall, which will easily cause damage or bending of the hammer plate, causing vibration to the hammer head, and it must be replaced if necessary.
The side hammer plate of the hammer frame and the side plate of the casing will be impacted by materials, and the wear of the side hammer plate is serious. In this case, it must be replaced to prolong the service life of the crusher. Although the wear of the hammer frame is not as serious as that of the hammer head, long-term accumulation will cause certain damage. Therefore, it is best to choose steel casting material for the material selection of the hammer frame to increase its wear resistance.
Hammer Crusher Wear Parts – Grate Bar Faults and Solutions
The grate bar of the hammer crusher is a control screen, which controls the particle size of the crushed product so that it is within the specified maximum size range. When crushing finely crushed and brittle materials, the gap of the sieve grid should be 3 to 6 times larger than the size of the finished product, and when crushing coarsely crushed products, the gap of the sieve grid should be 1.5 to 2 times larger than the size of the finished product. The gaps of the grating strips should be arranged along the direction of material movement, almost in line with the direction of tangential velocity.
At the same time, the gap between the grating bars should gradually expand from the inside to the outside of the grating bars, so that the broken products can be discharged as soon as possible without blocking the grating bars. The medium grating bar can allow the ore feeding humidity to reach 30%, while the general grating bar only allows the maximum humidity of the ore feeding to not exceed 15%.
The grating bars used in the current production of hammer crushers are all a group of steel bars of equal size, which are placed along the grooves on the grate bar frame during installation, and the two grate bars are separated by gaskets to ensure their At the same time, replacing gaskets of different thicknesses can change the gap between the bars.
Hammer Crusher Wear Parts – Liner Faults and Solutions
The hammer crusher hits the ore through high-speed hammering, and the ore will have great speed and kinetic energy in an instant. In order to prevent the wear of the frame, the inner wall of the frame is made of manganese steel. High-manganese steel is used for casting and quenching for strengthening treatment to ensure that the liner and striking plate can have excellent wear resistance and impact resistance.
The longest liner failure is excessive wear and tear or falling off while working. The wear of the liner is normal and unavoidable in the normal operation of the machine, so as long as it is within a reasonable wear range, there is no need to repair or replace the liner, but if the wear of the liner has exceeded the reasonable range, it is necessary Make a replacement.
At the same time, if there is a crack in the liner, as long as the crack is not particularly serious, it can be repaired with welding rods. If the cracks of the liner are particularly serious, or if there is a break, the liner needs to be replaced. For the lining board falling during work, it is necessary to check the machine before the machine works. If there is a problem with the fixing of the lining board, it should be repaired and reinforced in time.
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