The power supply of hydraulic cylinders in construction machinery and the implementation mechanism of construction machinery motion. Convert hydraulic energy into mechanical energy in the form of linear motion of required force and displacement. If hydraulic cylinders are classified by purpose and structure, their diversity. If classified according to pressure levels, there are only two commonly used types in construction machinery: low-pressure hydraulic cylinders and hydraulic cylinder pressure. The sealing structure, size, material, wall thickness, and processing technology of hydraulic cylinders are determined by their pressure levels in design and manufacturing. Users are concerned about the working conditions of hydraulic cylinders, internal and external leakage phenomena, which can achieve high volumetric efficiency and service life, and so on. The types of hydraulic cylinder failures in practical applications are often internal leaks and leaks, which are related to the sealing and assembly process of the hydraulic cylinder, and so on.

Generally speaking, the repair kit for engineering machinery seals consists of components such as O-rings, hole seals, shaft seals, and dust seals，

1. O-ring is generally used for static sealing. If the working pressure exceeds 20 MPa, it is usually necessary to add a material of polytetrafluoroethylene (PTFE) protective ring.

2-hole sealing: combined sealing with V-shaped, U-shaped rings, rings, sealing rings, etc., i.e. with V-shaped ring holes, circular holes, hole U-shaped rings, etc

3. The V-cycle is usually used for hydraulic cylinders with reliable sealing, and generally requires back-to-back installation in pairs and slotting. Sheath is commonly used in this type of sealed guide component.

4. U-shaped coils are widely used and reliably sealed, and many types of engineering and hydraulic cylinders are used for sealing. Can be used for slotting closed slots, and the guiding element is a turning belt.