Causes of Broken Main Shaft of Jaw Crusher

The breakage of the main shaft is a very serious failure for the jaw crusher because repairing it requires a long time and high cost, which can cause significant economic losses to the enterprise. Fodamon engineers have analyzed the following reasons and solutions for the fracture of the main shaft in a jaw crusher.

Improper speed control: Improper speed control of the jaw crusher will speed up the wear of the body. For example, when the load changes, the speed of the corresponding diesel engine will also experience relatively large fluctuations. If the speed regulation rate is too high, the idle speed is also relatively high, which will affect the stability of the jaw crusher engine and speed up the wear of the body. If the speed regulation rate is too small, it can also cause the instability of the engine operation.

Improper operation: If the operation is improper and deviates from the operation rules, such as sudden increase in feeding or changing materials with different attributes, it can cause the machine to become temporarily uncontrollable, resulting in sudden and slow phenomena, making the jaw crusher unstable under high-speed operation, and accelerating the wear of the main shaft.

Incorrect structure and layout: The main reason is the unreasonable structural design of the main shaft, which is prone to stress concentration. Specifically, there is interference between the mating surface of the main shaft and the moving cone, the fillet is too small, and there is no unloading groove. This can result in long-term overload operation of the equipment, causing the main shaft to experience fatigue and wear faster. For main shafts with smaller width, the fracture phenomenon is more likely to occur.

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