Fault causes and solutions of roller press - other damages

Roller shaft and reducer hollow shaft damages
The power of the roller press is transmitted from the motor to the roller through the reducer, and the roller and the reducer are fixed by the locking disk, which is a keyless coupling device that achieves load transmission by tightening high-strength bolts to cause pressure and friction on the surface. In order to guarantee a certain torque and axial load value, it must be locked according to the specified tightening torque. When installing the roller press, if the screw is not tightened according to the data required by the locking disk, the roller shaft and the hollow shaft of the reducer may be slipped and damaged. The repair method for this is generally thermal spray and cold welding.

Hydraulic cylinder oil leakage
Cause Analysis
(1) There are defects in the design. -- The contact surface between the cylinder body and the pressure plate is flat and this structure cannot be self-aligned. In the case of offset of the bearing seat, the cylinder body and the cylinder liner will be rubbed, resulting in wear of the seal ring. Moreover, due to the weight of the cylinder itself, when the cylinder moves, the degree of friction between the cylinder body and the upper and lower half arcs of the cylinder liner is different, thereby causing oil leakage of the hydraulic cylinder.
(2) The on-site environmental sanitation is poor, and dust enters the joint surface of the cylinder body and the cylinder liner, causing the seal ring to wear and the hydraulic cylinder to leak oil.
(3) The working pressure is too high, which affects the sealing effect of the seal ring.
(4) There is a quality problem in the hydraulic cylinder body itself, the machining accuracy is not high, and there are bumps.

How to improve
(1) The front end of the hydraulic cylinder can be equipped with a spherical structure. When the bearing seat moves and the axis of the hydraulic cylinder is not perpendicular to the surface of the bearing housing, the outer spherical surface rotates in the inner spherical surface, thereby eliminating the radial force that may be generated on the cylinder rod.
(2) Add one or two seals (oil seal) at the front end of the cylinder liner. Connect the oil returning hose with the oil tank or other containers to ensure that the joint part is intact and does not leak. After the above improvement measures, when the hydraulic oil is internally leaked, the leaked hydraulic oil reaches the fitting portion of the plunger and the cylinder sleeve through the seal on the plunger, but because the front end of the cylinder liner is sealed, and the pressure of the oil here is close to zero, so the oil will not leak from the front end of the liner. When the oil is collected more, it will be imported into the fuel tank or other containers through the oil returning hose, thereby avoiding the leakage of oil.
(3) Adding a canvas soft joint at the front end of the hydraulic cylinder to protect the cylinder rod leaking outside can effectively prevent dust from entering the inside of the cylinder. In short, strictly comply with the relevant operating procedures during maintenance, and maintain environmental sanitation during operation.

Side baffle leakage
The gap between the side baffle of the roller press and the end face of the roller is not well adjusted, and the gap is often increased due to wear and the like, causing leakage.

The roller press must ensure supersaturated feeding, and the baffle must have a good sealing effect. In general, in the case of ensuring that the end face is not rubbed, the baffle and the end face of the roller need to be as close as possible. Therefore, to solve the problem of missing materials, one must do the following:

(1) It must be ensured that the baffle is parallel to the end face of the roller, and that the end faces of the two rollers are to be flush.
(2) Because the side baffle is installed on the feeding mechanism, it must be ensured that the feeding mechanism is installed in the correct position, otherwise, the baffle position will be changed.
(3) After the side baffle is worn, it should be adjusted at any time. The lower lead screw can be used to adjust the gap between the baffle and the end face.


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