The reasons for the broken shaft of the cone crusher of a large stone crusher are as follows:

The quality of the main shaft and the external operating environment are the two key factors affecting its stability. Ensuring that the main shaft is made of excellent materials and has high processing accuracy is the primary condition for preventing fracture. At the same time, standardizing the operating procedures, performing regular maintenance inspections, and keeping the equipment in good condition can also effectively prevent fracture problems caused by improper use.

As for the fatigue fracture of the main shaft, the core reason is uneven feeding. When the material enters the crushing chamber to one side, it will cause excessive local load and cause impact load. This uneven force mode continuously applies periodic impact to the main shaft during the eccentric rotation of the main shaft. Over time, the main shaft is fatigued due to repeated bending and eventually breaks. Therefore, optimizing the feeding method and ensuring uniform distribution of materials are key measures to prevent fatigue fracture of the main shaft.

Solution: To solve the problem of fatigue fracture of cone crusher main shaft, the machine can be improved by setting a baffle in the feeding hopper to adjust the height of free fall of materials, and adjusting the upper frame crossbeam to be parallel to the feeding direction. At the same time, try to keep the cone crusher full of feed (full feed can make the equipment play a greater production capacity). This improved method can make the material evenly distributed around the crushing chamber, thereby improving the stress of the main shaft and preventing it from breaking.