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Starting From The Selection Of Design To Improve The Service Life Of Jaw Crusher

Published 2016/9/14 10:29:40

jaw crusher

Jaw crusher work machine is composed of working chamber of the movable jaw and fixed jaw structure, dynamic friction and Hubei Hubei under great crushing force and material, easy to wear, in order to protect the plate, usually in the lining plate of the movable jaw and the fixed jaw surface wear-resisting lining board installation, and the called the crushing plate. The surface of the crushing plate usually toothed, broken plate tooth peak angle of 90 degrees to 120 degrees, the size of the properties of materials were broken and fragmentation and crushing, bulk materials, the angle is bigger; broken pieces of material, small angle. The size of the pitch depends on the product size, usually equal to about outlet width, tooth height and tooth pitch of the ratio of 1/ 2 to 1/ 3. When working, the crushing plate two parts on the wear rate is not the same, the lower than the upper wear faster, crushing plate crusher in the Hubei type, direct contact with the material, friction under great crushing force and material, crushing plate service life is directly related to the jaw crusher the efficiency and cost of production, therefore, crushing jaw crusher plate to extend the service life is particularly important. Strengthening the service life of the broken broken plate can be considered from the aspects of design, material selection, assembly and use.

1 design, material selection
In the design, the broken plate of the moving jaw and the fixed jaw should be the tooth peak to the tooth valley. Thus, when crushing the material in addition to the extrusion effect, as well as bending action, the material is relatively easy to break. In order to enhance the service life of the broken plate, upper and lower symmetrical shape broken plate is designed into a small crusher, when the lower wear adjustable head; large jaw crusher crushing plate design pieces are symmetrical, so wear can be broken plate changing. The broken plate material can choose white cast iron. The hardness of white cast iron is larger, better wear resistance, easy sources, low price; drawback is brittle, easily broken and short service life. In order to improve the service life of the broken plate, containing more than 12% manganese manganese steel with better material used is ZGMn13. The steel toughness, while the hardness is not high (about 210 HB), but because has the characteristics of cold hardening, under pressure will continue to be strengthened, so in the work constantly and continuously strengthen the wear, wear and can not be used until before retirement. The steel plate casting broken after going through the water toughening treatment, water toughening treatment operation is substantially the same quenching, which cast the steel crushing plate is heated to 1000 to 1100 DEG C in the water after rapid cooling. After the water toughening treatment, the microstructure can be obtained, and the metallographic structure is fixed, so that the properties of the phase transformation can be avoided. The disadvantage is that steel prices more expensive, but from the aspect of life, the cost of the overall consideration, ZGMn13 long service life and low cost than the use of white cast iron.
2 assembly
When assembled, the broken plate must be firmly attached to the jaw plate, between the two should be smooth, between crushing plate and Hubei board with a soft metal (such as lead, zinc) as a gasket and bolt fastening. When the crusher works, the broken plate should not be loose, otherwise it is easy to break or wear and tear and reduce the service life of the broken plate. Therefore, the assembly must be installed to the broken plate, thereby prolonging the service life of the broken plate.
3 the use of the process to improve the life of the broken plate
In the production process, and the direct effect of plate material crushing, crushing force, especially the crushing materials with large hardness, causes the bolt installation vibration, crushing plate loose the nut, the crushing plate wear and great noise, serious broken plates off or broken equipment downtime, affecting the normal production. In this case, just before the start tightening bolt, nut is not completely solve the problem, according to the actual situation of the actual situation of the specific analysis of specific issues, and think of ways to take practical methods to solve the problem. For example, the spring can be used to prevent loosening and damping device to solve the broken plate in the work of loosening, thereby prolonging the service life of the broken plate, improve work efficiency. The specific approach is made of bolt loosening and self locking device of the spring, which is composed of the spring in the spring, the spring cover, a press cover, the device worn on the bolt tightening nut, nut pressing spring is due to a certain extent, have very strong anti vibration effect, bolt breaking force generated by the huge loose power is spring tension force automatic compensate, so as not to loose the bolt, thereby prolonging the service life of broken plate, improve production efficiency. In short, in the process of using can according to the specific situation to solve specific problems, to prevent crushing plate loosening, wear and fracture, thus prolonging the service life of the broken plate, reduce costs, improve work efficiency.
4 conclusions
Strengthen the jaw broken crushing plate life starting from design material selection, assembly, process improvement and other aspects, can well strengthen the jaw crusher crushing plate life, so as to improve the jaw crusher production efficiency, reduce production costs.

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