Advantages and friction performance of rotating Gley ring

The coaxial seal ring is a component developed in the early 1970s. After years of use and verification, it is widely used in the reciprocating motion sealing device of medium and high pressure hydraulic cylinders.

The coaxial seal ring for pistons is composed of a Gly ring plus an elastic rubber ring. It realizes bidirectional closure, and the coaxial seal for piston rods is directional. To prevent external leakage, high requirements for tightness, the contact part is stepped, with cutting edges, and the piston rod seal is called stepped type. When extended, due to the scraper effect of the blade, the oil film thickness can be reduced. When contracted, the closed bevel face can use the fluid dynamics to protect the oil film and return the working steel, improve the closure, and improve the lubrication conditions.

The Gly ring and step seal acting as sliding rings are made of polytetrafluoroethylene resin with different charges according to different use conditions. Polytetrafluoroethylene resin has a low friction coefficient, is not easy to bond, and has self-lubricating properties, so the coaxial closure has the smallest friction resistance in various reciprocating motions.

The elastic material is rubber, which can be used in a variety of cross-sectional forms. It does not directly contact the sliding surface, has low requirements for mechanical strength, hardness, and wear resistance, and has a wide range of material selection.

The performance of the coaxial seal ring for pistons is consistent with the accuracy of the closed even-type sliding surface, and is closely related to the groove processing accuracy and surface roughness.

According to the high-speed and low-speed conditions of the rotating Glyer ring, one or two circular grooves are opened on the closed surface according to the cross-sectional size of the Glyer ring. The annular groove stores oil to become a lubricating oil cavity that can reduce friction. The dynamics of oil accumulation in the rotating motion improves the sealing effect. The surface in contact with the rotating Glyer ring forms an arc along the axis, increasing the contact with the O-ring and preventing the Glyer ring from rotating with the axis. Its material is filled with polytetrafluoroethylene, and polyamide resin is used when the pressure is high. It can be used inside the rotating Glyer ring and the external circular closure, with lubricating oil, low friction, no viscosity, smooth start-up, wear resistance, and good dimensional stability.

The rotating Gly ring is suitable for shafts, rods, pins, rotary joints, etc. with rotating motion. It can withstand the pressure on both sides and the AC pressure. It works under the conditions of motion speed without high pressure and dozens of revolutions per minute, such as the center rotary joint of automobile starters and hydraulic loaders.

What are the sealing ring standards?

According to the material, the sealing ring can be divided into nitrile rubber sealing ring, natural rubber sealing ring, chloroprene rubber sealing ring, EPDM rubber sealing ring, hydrogenated nitrile rubber sealing ring, silicone sealing ring, fluororubber sealing ring, and silicone fluororubber sealing ring. The sealing ring standard is ID inner diameter * CS wire diameter.

The installation requirements of the sealing ring, the sealing ring is an important and effective means to solve the leakage problem of the hydraulic system. If the sealing ring of the hydraulic system is bad, the sealing ring may leak out of the hydraulic system, and the leaked oil will pollute the environment; it may also cause air to enter the oil suction chamber, affecting the working performance of the hydraulic pump and the stability of the movement of the hydraulic actuator. Therefore, it is very important to reasonably select and design the sealing ring device in the design of the hydraulic system. The requirements for the sealing ring device are as follows:

1. The sealing ring should have good sealing performance within the working pressure and a certain temperature range, and the sealing performance can be automatically improved as the pressure increases.

2. The friction between the sealing ring device and the moving parts should be small, and the friction coefficient should be stable.

3. The sealing ring has strong corrosion resistance, is not easy to age, has a long service life, good wear resistance, and can automatically compensate to a certain extent after wear.

O-ring production and processing technology

1. Design and develop product molds, arrange them reasonably, and calculate the shrinkage rate of rubber O-rings. Generally, the shrinkage of silicone O-rings is 1.03, and that of rubber O-rings is 1.018. However, the formula and hardness will affect this value. After the mold is opened, test the mold first, measure the product and check the drawings.

2. For the vulcanization molding of O-rings, adjust the mold temperature, molding time, clamping force, hydraulic pressure, mold opening method, etc.

3. Remove the burrs of O-rings, especially the clamping line, and clean the burrs.

4. Wash with water, and repeatedly wash the cleaned O-rings.

5. For secondary vulcanization, control the temperature and vulcanization time. The temperature of O-rings of different materials is different during secondary vulcanization.

6. Cool the O-rings, because the temperature of the O-rings is high after the high-temperature secondary vulcanization, so you must wait for 1 hour before doing the next process.

7. Perform a full inspection on each O-ring. The quality control personnel must check the size, appearance, hardness, oil resistance, temperature resistance, aging resistance, corrosion resistance, tensile strength, elongation at break, low temperature brittle temperature, compression deformation and other performance parameters of the O-ring one by one.