Responding Measures for the Broken Bolt of Cone Crusher

Responding Measures for the Broken Bolt of Cone Crusher

After long time of running, the connecting bolt of the lower part body and the dynamo bracket structure of cone crusher will break, thus seriously influencing the production capacity of this crushing equipment. In order to reduce this influence, it is necessary to improve the structure of cone crusher. There are three reasons that cause the breakage of the bolt: the contact surface of the connecting part is too small, there is gap between the contact surface the pretightening force of the bolt is not qualified. The following are measures for the broken bolt of cone crusher:

(1) Increase the contact surface of the connecting part

The cone crusher manufacturing company can design the connecting surface of the supporting frame of the electrical machine and the lower part body of the crusher in a axisymmetric rectangle, which is convenient not only for the process and manufacturing, but for symmetrically placing the bolts and make the symcenter of the bolt group and the centre of form of the connecting surface coincide in order to make sure the stress of the connecting surface is even. In the meantime, increase the number of the connecting bolts in order to improve the clamp force of the spare parts.

(2) Reduce the gap between the contact surfaces of the connecting parts

The friction coefficient is mainly influenced by the shape of the contact surface and the texture of the spare parts. Clean the rust on the 7-shaped contact surface of the lower part body of the crusher and the bracket contact surface of the electric motor in order to increase the friction coefficient of the contact surface.

(3) Fasten the machine with torque wrench to make the stress even

Under the strong vibration of the crusher body and the electric motor, the contact surface of the stand bar of the underframe and the direct connection driving underframe is easy to change its property, thus producing gap, so it is necessary to tighten the connecting bolt with torque wrench.

(4) Regularly fasten and change the screw

According to the running state of the equipment and the occurrence frequency of the faults, it is necessary to fasten the connecting bolts every week, and change them every month in order to reduce its breakage probability.