(I) Application in hydraulic cylinder

1. Piston seal: The piston seal located on the piston head is usually made of rubber or plastic. Its main function is to prevent hydraulic oil from leaking from the piston head. During the operation of the hydraulic cylinder, the piston seal can maintain good sealing performance under different working pressures by virtue of its own material characteristics, ensuring the normal operation of the hydraulic system.

2. Rod seal: The rod seal is located on the piston rod and is generally made of materials such as rubber or polyurethane to withstand high pressure and high temperature. It can effectively prevent hydraulic oil from leaking from the rod and provide protection for the stable operation of the hydraulic cylinder. In some high-pressure and high-temperature working environments, the performance of the rod seal is particularly important. Its good sealing performance can ensure the normal movement of the piston rod and prevent hydraulic oil leakage from polluting the surrounding environment.

3. Cylinder seal: The cylinder seal is located on the cylinder body of the hydraulic cylinder and is made of materials such as rubber or polyurethane to withstand high pressure and high temperature. The function of the cylinder seal is to prevent the hydraulic oil from leaking from the cylinder body and ensure the overall sealing of the hydraulic cylinder. In heavy machinery and equipment, such as excavators and milling machines, the reliability and durability of the cylinder seal are crucial. Once the seal fails, it may cause the machine equipment to fail to operate normally, and even cause damage and personal injury.

(II) Application in other machinery

1. For the sealing of pipe joints, component end covers and other fixings, paper pads, copper pads, aluminum pads or sealants are commonly used. These sealing materials play an important role in the sealing of fixings and can effectively prevent the leakage of hydraulic oil. Different sealing materials are suitable for different working environments and requirements. For example, in some high temperature and high pressure environments, high temperature and high pressure resistant sealing materials may be required.

2. Sealing between moving parts, such as O-rings are widely used, V-rings are used to seal hydraulic cylinders and piston rods with low relative speed, and Y-rings are used to seal hydraulic cylinders with high relative speed. The O-ring has an O-shaped cross section, a simple shape, and is made of rubber. It is mainly used for static sealing in hydraulic systems. It is rich in variety and suitable for various materials. The size and grooves are standardized, and it can achieve effective sealing for oil, water, air, gas and various chemical media. V-rings must be used with support rings and pressure rings. They have good sealing performance and the number of sealing rings can be determined according to the pressure. However, they have a complex structure and high friction resistance. They are suitable for hydraulic cylinders with low speed and high working pressure. Y-rings are used to seal hydraulic cylinders with high relative speed. The width-to-height ratio of the cross section is greater than 2, the working lip is shorter than the non-working lip, and it is used for holes and shafts. It will not roll when used and can meet the sealing requirements of high-speed movement.

(III) Application in different environments

1. According to the raw materials, different seals are suitable for different environments, such as acid resistance, alkali resistance, heat resistance, low temperature resistance, oil resistance, etc. Different working environments have different requirements for seals. For example, in some acidic environments, acid-resistant seals are required; in high-temperature environments, heat-resistant seals are required. The material and performance of the seal determine its applicable environment. Therefore, when choosing a seal, it is necessary to choose a suitable seal according to the specific working environment.

2. Temperature is the main factor affecting the hardness of the seal. In order to maintain the elasticity of the rubber seal at low temperatures, adhesives need to be added. Long-term immersion in the operating medium will cause aging and shortening. The seals should be checked frequently and replaced in time if abnormalities are found. Temperature has an important influence on the performance of the seal. In a low temperature environment, adhesives need to be added to maintain the elasticity of the rubber seal. However, long-term immersion in the operating medium will gradually absorb the adhesive, resulting in aging and shortening of the seal. Therefore, in order to ensure the performance and service life of the seal, the seal should be checked frequently and replaced in time if abnormalities are found. In practical applications, the appropriate seal material and structure can be selected according to different working environments and requirements to improve the performance and service life of the seal.