Issue 66: Hengyu Guoqiang reducer - development trend of domestic reducer
Time：2021-09-14 | Source：恒宇国强 | Browse：1920540
For domestic consumers, compared with domestic reducer, the inlet reducer also has certain advantages. First, the delivery time of the imported reducer of the major departments should be far higher than that of the domestic reducer; Second, the cost of large-scale imported reducers is far higher than that of domestic ones; Third, the after-sales service of the imported reducer is not direct and fast without the domestic reducer after-sales service; Fourth, with the continuous growth of domestic and domestic gear reducer skills, the skills and quality of the imported gear reducers are becoming more and more insignificant.
Therefore, with the development of the national industry of reducer more and more important, the domestic reducer enterprises are more and more important to the development of new technology of reducer, and the trend of domestic reducer replacing the imported reducer will not be stopped.
The development trend of seal parts of planetary reducer the service life of various hydraulic valves in hydraulic support is very low. This paper analyzes the development process of sealing pair of support valve, and discusses the relationship between the material of sealing pair and sealing performance. It is pointed out that sealing technology is the key to improve the service life of hydraulic valve in hydraulic support. 1、 The development trend of common seal parts of planetary reducer is more and more severe with the increasingly harsh service conditions of mechanical products. The use conditions of rubber sealing products also put forward higher requirements. For example, in aerospace, aviation industry, petroleum and mining industry, engineering machinery, transportation industry, energy industry and other industries, rubber seals are often used to adapt to wider temperature environment and high pressure Severe environment such as sand dust. The working pressure of the lip seal ring of the rotating shaft is usually 0.1-3.5mpa, and the maximum speed is 15-20 M / s. The maximum velocity of hydrodynamic type can reach 25-32m / s. But in higher cases, the working pressure is slightly lower. The main factor of the damage of the sealing element is impurities in the working fluid. These impurities are ground between the sealing elements to cause leakage of the valve. Therefore, the corresponding level of hydraulic components has been put forward abroad, and the filter with corresponding precision should be adopted. They think 5 μ If the filter precision is 3 / for the sealing element of M oil pump μ M filter, with a life span of 10 μ The M is 10 times higher. But the working environment of the valve used in hydraulic support is very bad. In the coal mining face, the total length of oil pipe is more than 1000 meters, and the joint spigot is up to 4000, and there is no special dust prevention facilities for the liquid tank. There are a lot of floating impurities in emulsion, and there are more pulverized coal, rock particles and iron chips at the bottom of column cylinder and valve cavity. The valve core and valve seat of the liquid inlet will fail soon because of the frequent opening and closing, high liquid flow rate. It is proved that it is very difficult to reduce the contamination and impurities of the hydraulic system of the support. Some people once thought that the high pressure filter should be used in the emulsion pump station, and at the same time, small filter was added at the inlet of each support. But it was blocked quickly in the work and formed a break. 2、 The development trend of squeeze seal of planetary reducer, especially O-ring, has been widely used in seals. Other types such as X, t, D, square, triangle, etc. are suitable for different applications. The direction of improvement is to make its sealing performance stable and reliable, improve its pressure resistance and reduce friction. It can also form a combination seal with low friction plastic such as polytetrafluoroethylene and nylon slip ring and supporting ring. The pressure resistance and friction force are improved. Some manufacturers have a product license of 7.5m/s and a sealing pressure of 5.6mpa. 3、 The development of reciprocating lip seal of planetary reducer yearns for the re moving lip seal, also known as lip gasket or leather bowl, which is widely used in the dynamic seal of reciprocating cylinder in hydraulic system. The system pressure of reciprocating seal is generally below 20MPa, and the combined seal with high performance used in aerospace and aviation industry can reach 56mpa. At this time, the maximum working speed is 1m / s. On the other hand, with the development of hydraulic support technology. The manufacturer has put forward higher requirements for the service performance and service life of the valve. At present, under the condition of 120 mesh filter and magnetic filter device, the life of the valve is measured by the total flow of emulsion through the valve being tested and the number of opening and closing times of the valve. But in fact, the results of indoor type test and underground work are quite different. At present, many countries have increased the requirements of anti pollution, some of which are mixing appropriate pulverized coal into emulsion, and some are mechanical impurities. With the development of China's economic construction, the requirements of sealing parts used in the environment of high cold, desert and underwater have been put forward.
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