Technical News

Highly reliable aerospace special seal design and its application to Shenzhou XII spacecraft During the Shenzhou 12 flight, a key sealing material played an important role. Xiamen Yudi Technology Co., Ltd. cooperates with the Aerospace Research Institute on aerospace sealing materials and processes. Relying on the research institute for more than 50 years of experience in the design of various special sealing structures and sealing materials in the aerospace field, the company has a series of special sealing design capabilities and rich application experience. Products include graphite sealing rings, metal O-rings, and metal Various sealing structures such as disc sealing ring, double metal redundant sealing ring, 24° composite sealing connection, double step composite sealing connection, etc., suitable for wide temperature range, low leakage rate, multiple working media, long-term sealing requirements The connection part.

1. Comprehensive physical examination Before storing the hydraulic breaker, you should first conduct a safety physical examination on the hydraulic hammer breaker to check for malfunctions and loose screws and clean the whole hammer. 2. Replacing the rod seal can prevent impurities from contaminating the hydraulic system. Once the hydraulic breaker seal kits is broken, it is obvious that the breaker has oil leakage, and the operating pressure of the breaker may be insufficient due to internal leakage. Therefore, the small breaker needs to replace the seal kits when the working time is about 500 hours, while the large breaker needs to replace the oil seal between 300-400 hours of work, and pay attention to cleaning when replacing the hammer seal kits. Especially in winter, because of the cold weather, the sealing performance of the seal kits and diaphragm is not good, and more attention should be paid to the frequent replacement of the seal kits.

Fluorosilicone rubber is a kind of hot-vulcanized special silicone rubber. Because its matrix polymer is silicone rubber containing trifluoropropyl group, it combines the advantages of silicone rubber and fluorine rubber: that is, it has good low temperature performance and insulation of silicone rubber. Performance, high temperature performance, easy processing and weather resistance, but also has low permeability, flame retardancy, good physical and mechanical properties and chemical stability similar to fluororubber, such as solvent resistance, oil resistance, oil and gas resistance, and suitable for various It is widely used in the fields of aviation industry, petroleum industry, automobile industry, chemical industry, etc. because of the harsh high and low temperature resistance fuel and lubricant resistance occasions. As a kind of sealing protection products, fluorosilicone rubber is suitable for use in aerospace, automobile, electromechanical, electronic, machinery and construction fields. It can be used in kerosene and steam at -55℃～220℃ and open flame at 150℃. And continue to use in harsh environments such as stress, temperature resistance, oil resistance, and ozone resistance when the strength is greater than 100KG. Below, the characteristics of our fluorosilicone rubber are introduced in detail.Fluorosilicone rubber is a kind of hot-vulcanized special silicone rubber. Because its matrix polymer is silicone rubber containing trifluoropropyl group, it combines the advantages of silicone rubber and fluorine rubber: that is, it has good low temperature performance and insulation of silicone rubber. Performance, high temperature performance, easy processing and weather resistance, but also has low permeability, flame retardancy, good physical and mechanical properties and chemical stability similar to fluororubber, such as solvent resistance, oil resistance, oil and gas resistance, and suitable for various It is widely used in the fields of aviation industry, petroleum industry, automobile industry, chemical industry, etc. because of the harsh high and low temperature resistance fuel and lubricant resistance occasions. As a kind of sealing protection products, fluorosilicone rubber is suitable for use in aerospace, automobile, electromechanical, electronic, machinery and construction fields. It can be used in kerosene and steam at -55℃～220℃ and open flame at 150℃. And continue to use in harsh environments such as stress, temperature resistance, oil resistance, and ozone resistance when the strength is greater than 100KG. Below, the characteristics of our fluorosilicone rubber are introduced in detail. Important characteristics of fluorosilicone rubber 1. Weather resistance, oil resistance, solvent resistance, and chemical resistance The main chain of fluorosilicone rubber is a Si-O bond structure, which is a saturated chain, so it has excellent air aging resistance. Its rubber test piece can still maintain good elasticity after five years of outdoor exposure test; after up to 10 years, Under ultraviolet light and harsh weather conditions, its physical properties have only minor changes. The tensile strength and elongation at break of samples placed in different locations have decreased by less than 25%. Compared with methyl vinyl silicone rubber, fluorosilicone rubber has excellent oil resistance, solvent resistance, and chemical resistance; even when compared with fluororubber, it has good oil and solvent resistance. After immersing in the same medium, temperature and time, it shows excellent durability. Fluorosilicone rubber has better resistance to methanol-containing gasoline. Even in a gasoline/methanol mixture, the hardness, tensile strength, and volume change of the vulcanized rubber are very small. After a long-term immersion test for 500 hours, the physical properties are also almost no change at all. 2. Heat resistance Compared with fluororubber, fluorosilicone rubber has excellent heat aging resistance, especially the retention rate of physical properties at high temperature. Compared with silicone rubber, fluorosilicone rubber reduces the heat resistance of fluorosilicone rubber to a certain extent due to the presence of trifluoropropyl group. The reason is that trifluoropropyl group is easily thermally decomposed, and the decomposition produces highly acidic compounds that accelerate fluorine. Thermal aging reaction of silicone rubber. The high temperature decomposition of fluorosilicone rubber is the same as that of silicone rubber, namely: side chain oxidation, main chain rupture, side chain thermal decomposition and various compound reactions. Since the decomposition products can also cause the main chain to break, the heat resistance is usually worse than that of silicone rubber, and it has begun to oxidize and age at a temperature of 200°C. Temperature has greater influence on fluorosilicone rubber than silicone rubber, but less than fluoroelastomer. Foreign countries have also studied the service life of fluorosilicone rubber at 150℃×2000h, 175℃×5000h, and 200℃×4000h. The result is second only to methyl vinyl silicone rubber. 3. Low temperature performance Like ordinary silicone rubber, fluorosilicone rubber has good low temperature performance. Since fluorosilicone rubber is a linear polymer composed of soft Si-O as the main chain, its low temperature characteristics are better than those of fluoroelastomers with C-C as the main chain. First of all, the molecular backbone of fluorosilicone rubber is relatively flexible, giving it excellent cold resistance. Secondly, the molecular chain of fluorosilicone rubber is in a helical configuration. The flexibility of the molecular chain is greater than that of the CC bond or the Si-C bond. The interaction force between the molecular chains is weak. These structural features make it soft and elastic. When it changes, the intermolecular force changes very little, so its various properties, especially elasticity, change little, making it have low-temperature performance that other rubbers can’t match. Third, the presence of trifluoropropyl substituted methyl can destroy the regularity of the polydimethylsiloxane molecular chain, reduce the crystallization temperature and degree of crystallization of the polymer, and make fluorosilicone rubber have a better low temperature than silicone rubber Sex. Therefore, fluorosilicone rubber still has elasticity at a low temperature of -60°C to -70°C, and can be used for a long time at -60°C. 4. Electrical insulation and radiation resistance The electrical performance of fluorosilicone rubber is similar to that of ordinary silicone rubber. Except for high frequency and high voltage electrical environment, its electrical insulation performance can reach the use level. The electrical insulation performance changes little under severe conditions such as high temperature, low temperature, humidity, oil, solvent, chemicals, ozone, etc. The radiation resistance of fluorosilicone rubber is not outstanding, but the radiation aging resistance is better than that of methyl vinyl silicone rubber. 5. Physical and mechanical properties Like ordinary silicone rubber, fluorosilicone rubber has relatively low mechanical strength (especially tear strength). Our company can customize and process fluorine-silicon special-shaped parts, O-rings, gaskets, gaskets, oil seals, etc. according to requirements. After customer experiments, the effect is excellent. Welcome customers in related industries to exchange and consult, and request samples for testing.

O-ring is a sealing element with a circular cross-section. In the mid-nineteenth century, some people used O-rings made of cast iron as the seals for steam engine cylinders. Later, natural rubber was used for faucets. With the development of rubber production, O-rings are currently made of synthetic rubber. Practice has proved that the sealing performance of the O-ring is very good, so it is used in equipment from airplanes to general hydraulic and pneumatic equipment. In this page, we will introduce the function of O ring in did

An engine is a machine that can convert other forms of energy into mechanical energy, including, for example, an internal combustion engine (gasoline engine, etc.), an external combustion engine (Stirling engine, steam engine, etc.), an electric motor, and the like. For example, internal combustion engines usually convert chemical energy into mechanical energy. There are many cases happen to engine, for wonepart we have experience of engine repair and rebuild projects, if your engine have the following problems, then you will check the following reasons as reference: 1. When the start switch is engaged, the engine crankshaft will not rotate Possible reason • Battery output is too low • Defective wire or switch • The electromagnetic switch of the starting motor is faulty • The starting motor is faulty • Intrinsic problems affecting the rotation of the engine crankshaft 2. Start the motor crank, but the engine cannot start Possible reason • No fuel in the fuel tank • Poor fuel quality • The fuel filter is dirty • The fuel pipe is dirty or damaged • Low fuel pressure • There is air in the fuel system • The fuel system and engine are not at the correct timing • The exhaust valve is always open (the fuel does not have high enough pressure to start the engine) • Turning speed is too low • No fuel in the fuel injection pump housing

Here-comes-the-bearing-disassembly-non-destructive-disassembly-any-bearing-can-be-dismantled-like-this! There is all kinds of hydraulic pump and parts, engine and parts need to use bearing, and we could supply all kinds of bearing for you. However, when you have problems, how to dismantle in non-destructive way.Reasonable disassembly of the bearing in the case of interference fit is the core of bearing disassembly technology. When the disassembly force is so large that it cannot be dismantled by ordinary methods, and the disassembly force produced by conventional methods is likely to damage the bearing, an oil hole is generally designed at the end of the shaft, the oil hole extends to the bearing position and then penetrates radially to the shaft surface An annular groove is added, and a hydraulic pump is used to pressurize the inner ring to expand the inner ring during disassembly to reduce the disassembly force. For small bearings mounted on adapter sleeves with straight shafts, a hammer can be used to remove small steel blocks that evenly act on the end face of the bearing inner ring (Figure 7). For bearings mounted on adapter sleeves with stepped shafts, the use of hydraulic nuts can make bearing removal easier. After the bearing has been running for a period of time, there will inevitably be needs for maintenance or damage replacement. In the early development of the machinery industry, the popularity of professional knowledge was insufficient, and the awareness of safe operating procedures was insufficient. Today we will only talk about the disassembly of bearings .

Working principle of hydraulic sequence valve from wonepart The sequence valve is a pressure valve used when a hydraulic pump needs to supply two or more hydraulic actuators to operate in a certain sequence. The control pressure can be its own pressure or external oil pressure. Its structure and operating principle are very similar to the relief valve, and the difference is that the outlet of the sequence valve is directly connected to the actuator, and there is a special drain port. Any hydraulic pump parts or hydraulic valve we have, but we focus on kawasaki pump and parts and valves.

Excavator engine burning oil refers to the fact that the oil loss during the excavator operation is higher than that of the same type and the same type of excavator oil, and the operation is accompanied by the phenomenon of blue and black smoke. Excavator engine burning oil is one of the more serious faults in the engine failure of excavator. Let's understand the reasons and solutions for the burning of excavator oil: The breakdown of excavator burning oil failure classification: a large amount of blue smoke is emitted at startup; a large amount of blue smoke is emitted when refueling; A large amount of blue smoke is emitted from the oil filling port; the consumption exceeds the normal requirement.

Do you know the functions of the sensors and solenoid valves on the excavator? For environmental protection, excavators are now mostly EFI vehicles. Diggers often encounter various alarm codes, and these alarms are mostly caused by sensor or solenoid valve failures. Here are the ten sensor and solenoid valve positions and functions on the engine.If you are looking for engine parts, pls visit our online website http://www.wonepart.com/product-list/engine, you could find many items, and if you could not find pls email us info@wonepart.com.

What should I do if the hydraulic pump or hydraulic valve system runs slowly and under speeds? The hydraulic system runs slowly, which is often referred to as under speed. Under speed does not work, but fails to meet the system requirements, so troubleshooting is difficult and there are many situations. The following summarizes the two situations and specific causes of hydraulic system under speed for your reference.