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Sealing rings are widely used in daily life, as long as they can be connected with machinery, hydraulic valve sealing rings may be used, ranging from small cigarette holder filters to large aviation spacecraft, etc., all need to use sealing rings.  There are many types of sealing rings, which can be divided into: common silicone rubber sealing rings, fluororubber sealing rings, ethylene propylene rubber, polytetrafluoroethylene, neoprene, polyurethane and so on. According to the use, it can be divided into: acid-resistant sealing ring, alkali-resistant sealing ring, high-temperature resistant sealing ring, low-temperature resistant sealing ring, oil-resistant sealing ring and so on. In daily life, if there is no sealing ring in the machinery industry, it will not be able to start, such as an oil seal. If there is no oil sealing ring, there will be oil leakage, and in severe cases, it will not even work. We often see news of crude oil leakage on the Internet. In fact, this is because the oil seal ring is not done well or the quality of the seal ring is not up to standard. Sealing rings for different purposes can work in different environments. Such as high and low temperature environment, acid and alkali solution, oil resistance and so on. Sealing rings working in different environments should choose different materials, such as the high temperature resistance of fluororubber. Sometimes the hardness of the sealing ring is also an important factor affecting its function. Not all sealing rings are soft. For example, the sealing ring of PTFE is quite hard. The mechanical sealing ring should be checked frequently, and it should be replaced in time if abnormalities are found, such as deformation and cracking of the sealing ring, etc. The main factor affecting the service life of the sealing ring is the operating environment. Temperature is the most important factor for the hardness of the sealing ring of hydraulic valves. In order to keep the rubber sealing ring elastic at low temperature, a certain amount of plasticizer needs to be added to the rubber. Soaked in the operating medium for a long time, the plasticizer will be gradually absorbed by the operating medium, causing the aging of the seal to shorten. Therefore, the seals should be checked frequently. Avoid aging to cause accidents.

Form Analysis of Hydraulic System LeakageThe leakage of the hydraulic system is the phenomenon that the working medium flowing or temporarily stored in the hydraulic components and the system cavity flows from the high pressure cavity to the low pressure cavity or from the system to the outside of the system through the non-working channel. Leakage is a common phenomenon in metallurgical hydraulic equipment. Leakage may occur in all links from power components to actuators, which is determined by the nature of hydraulic transmission. However, once the leakage exceeds the allowable range, it becomes a leakage failure, which is not allowed and must be effectively controlled.Hydraulic system leakage can be divided into fixed seal leakage and moving seal leakage according to the leakage location. Fixed seal leakage mainly includes leakage of the sealing surface of the valve and valve block, leakage at the connection of the oil cylinder port, leakage at the connection of the motor oil port, and leakage at the connection of the oil pump inlet and outlet; leakage of the moving seal mainly includes leakage of the pump spindle, motor Spindle leakage, extended valve stem leakage and hydraulic cylinder piston rod leakage, etc.According to the form of oil leakage, it can be divided into internal leakage and external leakage. External leakage mainly refers to the leakage of hydraulic oil from the inside of the system to the external environment; internal leakage refers to the flow of hydraulic oil from the high pressure side to the low pressure side inside the system due to the existence of pressure differences between the high and low pressure sides of the system and the failure of seals. Among them, due to factors such as many internal leakage incentives, wide distribution of related components, and difficulty in direct monitoring, coupled with the fact that internal leakage is the main factor affecting the working efficiency of the hydraulic system, excessive internal leakage will cause fluctuations in the control accuracy and efficiency of the hydraulic system. The stability and reliability are reduced, and even the original design function is lost. Internal leakage has become the top priority of hydraulic system prevention and control.

1. Hydraulic seal O-ringThe seal with a circular cross-section can achieve sealing by eliminating the gap by pre-compression, and can automatically increase the contact stress between the seal and the sealing surface as the pressure increases, thereby improving the sealing effect. It can be used for static sealing of high-pressure end faces and cylindrical surfaces, and can also be used for low-pressure reciprocating dynamic sealing of low-pressure moving speed. Inexpensive, simple, good sealing, automatic compensation after wear and tear.2. Various sealing gaskets for hydraulic sealingCombined sealing gasket is a combined sealing gasket made of oil-resistant rubber inner ring and steel outer ring, which is easy to install and reliable in sealing. It is mostly used for end face sealing of threaded pipe joints, etc.3. Sealant for hydraulic sealsThe sealant has fluidity and can fill the gap between the two joint surfaces, and it can seal and prevent leakage under a certain tightening force. According to the nature of the film formed between the two bonding surfaces, it can be divided into four types: dry adhesion type, dry peelable type, non-dry sticky type and semi-dry viscoelastic type. It is divided into two categories: liquid sealant and anaerobic sealant.After dry peelable coating, the solvent volatilizes quickly to form an elastic film, which is easy to peel off from the adhesive. It has good vibration resistance, but it is easy to volatilize and is difficult to use on a large area.The non-drying sticky sealant does not dry for a long time after application, and always maintains viscoelasticity. Therefore, it has good detachability, high vibration resistance and impact resistance, and is suitable for large-area coating.The semi-dry viscoelastic type is between the above two and has the advantages of both.Anaerobic sealants are suitable for pressure-resistant sealing of some small surfaces such as threaded pipe joints, which can prevent impact loosening and leak-proof.The application method of liquid sealant and anaerobic sealant is: pretreatment (remove oil, rust, decontamination) → coating (coating 0.06-0.1mm) → drying → fastening.

Construction machinery anti-icing dust ring introductionTechnical application:This technology can scrape off hard objects such as ice slag and cement solidification attached to the piston rod of construction machinery, avoid damage to the cylinder seal by hard objects, and prolong the life of the oil cylinder.Technical points:1. Polyoxymethylene is used as the base material, which has high hardness, small friction coefficient and good wear resistance.2. O-shaped spring provides preload.3. Double lip structure.Technical advantages:1. The hardness of the matrix material is relatively high, which can scrape off hard objects such as cement slag and ice slag attached to the piston rod;2. The O-shaped sheet spring has a large resilience, and the lip is close to the piston rod to scrape off the dust particles in the general environment.3. The matrix material has a small friction coefficient and good wear resistance, which can prolong the service life of the dust seal.4. The double-lip structure scrapes dust more cleanly.