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What are the precautions for how to replace the sealing ring in the pneumatic small knowledge cylinder?

Update:28-04-2020
Summary:

When using the inlet O-ring, the operation quality of t […]

When using the inlet O-ring, the operation quality of the installation process directly determines whether the sealing state is stable, and it also has a huge impact on the service life of the inlet O-ring. In addition, the leakage problem in the later use is often caused by imperfect installation and operation, and it is easy to damage the O-ring product. Although imported O-ring parts can be replaced during the operation of the equipment, if the damaged sealing parts are not replaced in time, it will cause a large production loss and may even cause damage to the production equipment.
The SMC cylinder must therefore pay attention to the handling of various details during the installation process, especially to adjust the scratches and damage in time. Errors are not allowed in the installation operation. Although the imported O-ring itself has high elasticity and deformation strength, the incorrect installation will still cause great damage to the sealing components. Problems such as scratches on the sealing ring or distortion caused by careless installation are typical safety hazards.
Before installing the SMC cylinder, the sealing groove and the mating surface must be thoroughly cleaned to remove all impurities. If there are cracks or scratches, the intact parts should be replaced in time. At the same time, apply grease evenly on the surface of the O-ring to ensure that the equipment is in good condition during use.
In addition, in order to prevent the imported O-ring from being scratched by sharp objects during the installation operation, a certain lead-in angle is left at the end of the installation shaft and the hole section to keep the sealing ring smoothly installed to a fixed position. If you need to pass a section of thread during installation, you must use a special metal guide sleeve for operation. In addition, you need to pay more attention to keeping the O-ring from touching the sharp part when passing through the cut. Only in good condition can normal operation be guaranteed.
SMC cylinder seals are mainly for sealing air pressure systems. In fact, we know that the standard of cylinder seals can be divided into various types according to the cross section of the seal ring. This is not the case-introduced. Cylinder seals are important effective method. If the hydraulic system has a bad sealing ring, the cylinder sealing ring may have an impermissible external leakage, and the leaked oil will pollute the environment; it may also allow air to enter the suction chamber, affecting the performance of the pneumatic pump and the stability of the pneumatic actuator movement . Therefore, the reasonable selection and design of the sealing ring device is very important in the design of the pneumatic system.
But what about rubber O-rings?
1. Brief description
The SMC cylinder is a rubber ring with a circular cross-section. Because its cross-section is type 0, it is called a rubber O-ring. It is widely used in hydraulic and pneumatic transmission systems.
SMC cylinder is a circular rubber seal ring with a circular cross section, which is mainly used to prevent the leakage of liquid and gaseous media under mechanical conditions. In some cases, O-rings can also be used as dynamic sealing elements for axial reciprocating motion and low-speed rotational movement. According to different conditions, different materials can be selected to suit them.
The SMC cylinder is usually selected as much as possible to use O-rings with large cross-sections. In the case of the same gap, the volume of the O-ring seal being squeezed into the gap should be smaller than the volume it is squeezed into
SMC cylinders are a commonly used form of sealing in fluid power systems and work well in many fluid power systems, but must be cautious and careful in their role. O-rings can only function when deformed. The O-ring is shaped like an O-ring, it is installed in the sealing groove, and then compressed, so that there is no gap in the sealing groove, thereby sealing the liquid flow or air flow. Although this simple sealing structure has a good sealing effect in a fluid power system, only a careful design, careful selection, and proper installation can achieve a good seal.
Second, the cause of rubber O-ring failure and countermeasures
(1) Installation damage
Failure status: Part or all of the sealing ring shows a neat wound.
Reasons for failure: sharp corners of grooves and other parts, inappropriate size of seals; hardness or elasticity of seals is too low; dirt on the surface of seals.
Solution: Clear sharp edges and corners; more reasonable groove design; choose seals of appropriate size; choose seals with greater elasticity and higher hardness.
(2) curl
Failure status: O-ring is obviously curled
Causes of failure: caused by installation, the movement speed is too low, the material is too hard or the elasticity is too small, the O-ring surface treatment is uneven, the groove size is uneven, the groove surface is rough, and the lubrication is insufficient.
Solution: Correct installation, use high elastic materials, properly improve the design of the groove and the smoothness of the surface, and use the support ring as much as possible.
(3) Excessive compression
Failure status: The O-ring contact surface is deformed flat and may be accompanied by cracks.
Reasons for failure: The design is unreasonable, without considering the deformation of the material due to heat and chemical media, or the deformation caused by excessive pressure.
Solution: The design of the trench should take into account the deformation of the material due to temperature and chemical media.
1. The cylinder sealing ring should have good sealing performance within the working pressure and a certain temperature range, and can automatically improve the sealing performance as the pressure increases.
2. The friction force between the cylinder seal ring device and the moving parts should be small, and the friction coefficient should be stable.
3. The cylinder sealing ring has strong corrosion resistance, is not easy to age, has long working life, good wear resistance, and can be automatically compensated to a certain extent after wear.
4. The structure is simple, easy to use and maintain, so that the seal ring has a longer life.
Precautions for installation of SMC cylinder sealing ring
1. Clean the installation location;
2. Remove burrs during the installation of the seals;
3. Apply lubricant to the seal;
4. Protect the sealing surface from damage;
5. Check to confirm the correct size of the seal;
6. Use the corresponding tools to install the seals that need to be deformed.

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