During the gravel operation of the heavy industry miner, the materials act directly with the jaw plate, and the crushing force is very large. Especially when crushing the materials with high hardness, the bolts for installing the jaw plate vibrate and the nuts become loose, which aggravates the wear of the forehead plate and produces great noise. In serious cases, the jaw plate falls off or breaks, resulting in the shutdown of the equipment and affecting the normal production. In this case, only tightening the nuts and bolts before startup can not completely solve the problem. We should analyze the specific problems according to the actual situation on site and find ways to solve the problem by taking practical and feasible methods.

      The new generation of spherical self tightening nuts developed by Zhejiang self tightening Wang Machinery Co., Ltd. by using the mechanical principle and self tightening principle can effectively solve the problem of nut loosening in the process of high-speed vibration, enable the equipment to be used completely and effectively during the service period, and avoid potential safety hazards in the use process.