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Release time: 17:24, October 28, 2020 Publisher: Dongmeng Road & Bridge Machinery Co., Ltd.

How to improve the service life of crushing plate of stone crusher?


The working mechanism of the stone crusher is composed of the working chamber composed of the moving jaw and the fixed jaw. The moving jaw and the fixed jaw bear the huge crushing force and the friction of the materials, which are easy to be worn out. In order to protect the jaw plate, wear-resistant lining plate is generally installed on the surface of the moving jaw and the fixed jaw, which is also known as the crushing plate. In the process of use, it is very important to extend the service life of the crushing plate of the jaw crusher. So how to strengthen the service life of stone crusher? We can consider from the design, material selection, assembly and improvement in the use process.

In design, the crushing plate of moving jaw and fixed jaw should be tooth peak to tooth valley. In this way, in addition to extrusion, there is also bending effect on the material during crushing, so the material is easy to be broken. In order to enhance the service life of the crushing plate, the crushing plate of the small and medium-sized crusher is designed to be symmetrical at the top and bottom, and can be used when the lower part is worn; the crushing plate of the large jaw crusher is designed to be symmetrical with each other, so that the crushing plate can be replaced after wearing. The material of crushing plate can be white cast iron. White cast iron has the advantages of high hardness, good wear resistance, easy source and low price; its disadvantages are brittle, easy to break and short service life. In order to improve the service life of crushing plate, it is better to use manganese steel containing more than 12% manganese, and ZGMn13 is commonly used. The toughness of manganese steel is good. Although the hardness is not high (about 210? HB), because of its cold work hardening characteristics, it will be continuously strengthened under pressure, so it will be continuously worn and strengthened in the work, and it will not be scrapped until it is worn to the point where it can not be used. After casting, the manganese steel crushing plate should be treated by water toughening treatment. The operation of water toughening treatment is basically the same as quenching, that is, the cast manganese steel crushing plate is heated to 1000 ~ 1100 ℃ and then rapidly cooled in water. After water toughening treatment, uniform metallographic structure can be obtained, and the metallographic structure can be fixed down, which can avoid the natural phase transformation in use and make the performance worse. The disadvantage of manganese steel is that its price is relatively high. However, in terms of service life and cost, ZGMn13 has a longer service life and lower cost than white cast iron.

During assembly, the broken plate must be firmly attached to the jaw plate, and the two should be leveled. Soft metal (such as lead, zinc, etc.) should be used as the gasket between the crushing plate and the jaw plate, and the bolts should be used for fastening. When the crusher is working, the crushing plate should not be loose, otherwise it is easy to break or wear the crushing plate and reduce the service life of the crushing plate. Therefore, when assembling, the crushing plate must be installed to prolong the service life of the crushing plate.

In the production process, the crushing plate and the material act directly, and the crushing force is great. Especially when crushing the materials with high hardness, the bolt vibration and nut looseness of the crushing plate will lead to the aggravation of the wear of the crushing plate and produce great noise. When the crushing plate falls off or breaks, the equipment stops and affects the normal production. In this case, only tightening the bolts and nuts before starting the machine can not completely solve the problem. It is necessary to analyze the specific problems according to the actual situation on site, and try to find a way to solve the problem. For example, spring anti loosening and vibration damping device can be used to solve the loosening of crushing plate in work, so as to prolong the service life of crushing plate and improve work efficiency. The specific method is to use the spring to make bolt anti loosening and self tightening device. The device is composed of inner spring gland, spring and outer spring gland. The device is threaded on the bolt to tighten the nut. As the spring is compressed to a certain extent by the nut, the strong anti vibration effect will be produced. The bolt loosening force generated by the huge crushing force is automatically compensated by the spring tension force, so the bolt will not be damaged Loose, so as to prolong the service life of the crushing plate and improve the production efficiency. In a word, in the process of using, we can find ways to solve the specific problems according to the specific situation, prevent the broken plate from loosening, wear aggravation, breaking and so on, so as to prolong the service life of the crushing plate, reduce the cost and improve the work efficiency.
 
It can be seen from the above that in order to strengthen the service life of the crushing plate of the stone crusher, we must start from the design of material selection, assembly and improvement in the use process, so as to improve the production efficiency of the jaw crusher and reduce the production cost.

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