What is the reason for the gear knocking phenomenon during cone crusher operation?

For cone crushers, any failure during production will cause a decrease in efficiency, and some failures will also increase operating costs. For example, the gears of the machine can be divided into large bevel gears and small bevel gears. They are important transmission components inside the equipment, and both have expensive procurement costs. However, during production, due to certain reasons, the phenomenon of tooth breaking will occur. Here we will introduce the causes of this phenomenon and their respective solutions.

Reason 1: Iron jam

The main reason is that when the cone crusher is in use, uncrushable materials (iron) enter the crushing chamber, and this material exceeds the maximum value of the iron size of the machine, causing jamming. At this time, the equipment is shut down due to material blockage. When the slag inlet and the internal slag block materials of the crusher are not cleaned up, the operator forcibly starts the motor with heavy loads many times in order to shorten the slag cleaning time, causing the transmission umbrella teeth inside the crushing equipment to be overloaded and fatigued many times and broken.
The solution to this phenomenon is to adjust the current of the cone crusher protection device so that it cannot be forced to start or tripped instantly under heavy load. In addition, when the machine is feeding, in order to prevent the phenomenon of iron, a permanent magnetic hanging iron removal device can be installed on the belt. The implementation of these different measures can prevent the phenomenon of gear tooth hitting caused by the phenomenon of iron stuck.

Reason 2: Poor lubrication

The lubrication operation of the cone crusher is mainly to reduce the wear of internal parts. However, in production, if the water seal dustproof device is not sealed tightly, a large amount of dust will enter the lubricating oil in the machine body, so that the oil quality of the lubricating oil will deteriorate rapidly, resulting in poor lubrication, causing the large and small bevel gears to hit and wear seriously.

The solution to this phenomenon is to replace the lubricating oil in time, and then during the use of the cone crusher, frequently check the operation of the oil pump, filter, cooler, valve and pipeline in the thin oil lubrication station, the oil quality and the oil pressure and oil temperature of the thin oil lubrication system to reduce the phenomenon of poor lubrication of the crusher.

Reason 3: Improper meshing of large and small bevel gears

If the gears of the cone crusher are not properly meshed, additional impact vibration and additional sliding wear will be generated when crushing materials, resulting in shortened gear life and even tooth hitting.

The solution to this phenomenon is to make the large and small bevel gears mesh correctly, eliminate the reciprocating sliding and additional impact between the gears, reduce wear, and prevent tooth hitting.

Reason 4: Improper meshing clearance of large and small bevel gears

This phenomenon is mainly caused by improper adjustment of the tooth top and tooth side clearance of the cone crusher gears during installation, or the wear of the thrust disc causes inclined grooves on the contact surface between the upper disc and the eccentric sleeve, thereby affecting the meshing clearance between the large and small gears, and easily causing tooth hitting in production.

The solution to this phenomenon is to regularly check the meshing clearance of the bevel gears and the matching clearance between the eccentric sleeve and the frame bushing when the crusher is in use, and promptly replace the eccentric sleeve or frame bushing that is worn beyond the standard to ensure that the clearance is within the specified range, thereby effectively preventing the phenomenon of tooth hitting.

Reason 5: Low gear processing accuracy

This is the fundamental reason for the gear chipping phenomenon in cone crusher production. The solution is to improve the gear processing accuracy and ensure uniform contact surface, which can increase its service life and avoid root cutting and chipping.