What are the causes of loose fixed jaw plate of jaw crusher?

Loosening of the fixed jaw plate of a jaw crusher can mainly be attributed to the following factors.

During equipment installation, if the mating surface on the back of the tooth plate is not cleaned up, residual slag and impurities will cause poor contact on the joint surface. In addition, if the pre-tightening force of the pressure plate and bolts fails to meet the rated standard and the fastening work is not carried out in the standard diagonal alternating sequence, the force distribution at each connection point will be severely uneven.

If lock washers are missing, damaged or lose elasticity, nuts will gradually rotate and shift under the high-frequency vibration generated by continuous equipment operation, and eventually come loose. Frequent material jamming inside the crushing chamber and accidental entry of hard foreign objects such as iron blocks will create repeated high-intensity impacts on the fixed jaw plate and continuously apply extra tensile load on the fastening bolts.

After long-term operation, the fixed jaw plate will suffer thinning from wear, deformation and warpage, so it cannot fully fit tightly with the base. The fixed jaw plate will keep shifting during operation, causing irreversible damage to the original fastening structure. When the equipment runs under long-term high-frequency vibration, fastening bolts may experience metal fatigue elongation and thread stripping failure.

Besides, deformation of the pressure plate itself or mismatched assembly dimensions will make the compression positions fail to meet design requirements and unable to provide reliable rigid restraint for the tooth plate, which also leads to loosening and displacement of the fixed jaw plate. If this fault is not handled in time, it may trigger serious failures such as fracture or falling-off of the fixed jaw plate and directly result in unplanned shutdown.

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