How to control the pneumatic rod not to rebound?

The method for controlling the pneumatic lever not to rebound is as follows

The piston rod of the hydraulic cylinder leaks, the internal seal of the oil rod is not good, or there is something wrong with the control valve. In this case, the reciprocating pressure of the hydraulic rod will not be reached, and the oil pressure control will not be normal.

After the cylinder and piston rod are bent due to accidents, they should generally be straightened on the press. But after a period of time, the cylinder or piston rod straightened in the press will often rebound, that is, the cylinder or piston rod will restore its original shape to a certain extent. For this reason, some repair shops have developed a long cylinder bending straightener after a long period of exploration. When in use, put the bent cylinder or piston rod into the straightener, press down the pinch roller, start the motor, roll back and forth, and constantly adjust the pinch roller according to the situation to make the bent cylinder or piston rod straighten slowly.

This is different from straightening on a press. Straightening on the straightener can not only straighten the bending part, but also release the internal stress of the cylinder or piston rod caused by bending under the repeated action of the upper and lower rollers to ensure that it does not rebound after straightening.

Before the cylinder or piston rod enters the straightening machine, some pre-straightening work should be carried out to control the bending degree before entering the machine within a certain range. Two-section curved long cylinder is often encountered in straightening with straightener. Under its larger curvature, the allowable roller spacing is larger.