Nov . 11, 2023 13:45 Back to list

Hydraulic jack

1.Operating principle of the hydraulic cylinder

Hydraulic transmission principle: with the oil as the working medium, through the sealing volume change to transfer the movement, through the pressure inside the oil to transfer the power.

2.Types of the hydraulic cylinder

According to the structural form of the common hydraulic cylinder:

According to the motion mode can be divided into straight line reciprocating motion type and rotary swing type；

According to the effect of liquid pressure, it can be divided into single action and double action

According to the structure form can be divided into piston type, plunger type;

According to the pressure grade can be divided into 16Mpa, 25Mpa, 31.5Mpa etc .

1）pistontype
The single piston rod hydraulic cylinder has only one end of the piston rod, both ends of the import and export oil ports A and B can pass the pressure oil or oil return, to achieve two-way movement, called dual-acting cylinder.

2）plunger type

Plunger hydraulic cylinder is a kind of single-action hydraulic cylinder, which can only achieve one direction by liquid pressure Movement, the plunger return to rely on other external forces or the weight of the plunger.

The plunger is only supported by the cylinder liner without contact with the cylinder liner, so that the cylinder liner is easy to process, suitable for the long stroke hydraulic cylinder.

3.Hydraulic cylinder installation method and precautions

1）The hydraulic cylinder and the surrounding environment should be clean, the oil tank should be sealed to prevent pollution, pipeline and oil tank should be cleaned to prevent falling oxide peel and other debris。

2） Clean with no velvet cloth or special paper, can not use hemp thread and adhesive as sealing material, hydraulic oil according to the design requirements, pay attention to the change of oil temperature and oil pressure。

3）The pipe connection shall not be relaxed。

4）The base of the fixed hydraulic cylinder must have enough stiffness, otherwise the cylinder cylinder into a bow up, easy to make the piston rod bending。

5）The central axis of the moving cylinder with the foot seat fixed should be concentric with the middle line of the load force to avoid the lateral force, which can easily make the seal wear and damage the piston, and keep the hydraulic cylinder parallel with the moving direction of the moving object on the rail surface, and the parallelism is generally not greater than 0.05mm / m。