The hydraulic cylinder of waste paper packer includes main cylinder, side wall cylinder and door cylinder with door. The main cylinder is of front flange type. It is connected with the upper beam of main engine by bolts. When high pressure oil acts on the cylinder piston, the piston rod is pushed to move in the cylinder body in a reciprocating straight line, so that the packed material is compressed in the box, thus reducing the occupied space and achieving the effect of packing.

Single piston rod hydraulic cylinder, also known as double acting cylinder, has only one end piston rod. Both inlet and outlet oil ports a and B can be connected with pressure oil or oil return to realize bidirectional movement.

The cylinder of waste paper packer is a single piston rod type double acting cylinder, which has piston and sealing ring in the cylinder body, which makes the cylinder body form two oil chambers, which can push the piston movement when the high pressure oil acts on the front or rear cavity to achieve the purpose of the cylinder movement.

The cylinder mouth of the cylinder is provided with guide sleeve and sealing ring, which is used as the support, guide and seal of piston rod; At the same time, the cylinder mouth is fixed with a parallel cap and equipped with dust-proof ring to remove the waste paper packer travel switch on the piston rod, which is used to control the start and stop of the machine. Therefore, it is necessary to check, repair and maintain frequently.