The development of China engineering mechanical seal technology has gone through 50 years of history, from the beginning of a difficult start to the rapid development of today, Chinese engineering mechanical seal technology has made important contributions to the development of construction machinery industry China. The process of the development of construction machinery rubber seal for the main application of sealing technology can be divided into four stages. Mechanical seal
1 starting stage (1960-1970)
During this period, the working pressure of hydraulic system of construction machinery products in China is about 12-14MPa. The sealing system uses the seal: 0 rubber seal (NBR); a leather shell rotary oil seal; end face corrugated steel skin ten cork ten metal spring sealing; asbestos; asbestos rubber gasket ten; V ring (ten leather ten phenolic bakelite); V ring (NBR ten clip fabric: soft metal gasket and so on.
2 start-up phase (1971-1980)
During this period the production of China's construction machinery main products hydraulic system working pressure is about 14-3.5MPa. The sealing system used in seal with rubber seals, face out of the leather, asbestos fiber and corrugated steel skin ten cork seal. The main types of D: 0 sealing ring (NBR, FKM); crawler D chassis floating oil seal (metal ring dry form 0); D inside the framework of the rotary seal oil Chuan BR, FKM, ZACM). Hydraulic and pneumatic reciprocating seals D there are 0 forms of sealing ring (NBR, FKM); U shaped compact D ring (NBR, AU, BU):V shaped ring (NBR ten clip fabric); cup seal ring (NBR, ten). Mechanical seal
In the past 10 years, in order to adapt to such as engineering machinery, forging machinery used in the development of high-pressure hydraulic technology, by the former Ministry of machinery set up 7 specialized rubber seals factory. In addition, in order to promote the development of Chinese sealing technology, and in 1975 1979 set up a "national standard of hydraulic and pneumatic Standardization Technical Committee and a" national hydraulic and pneumatic rubber seal of the technical committee of Standardization Technical Committee "(corresponding to the old ISO/TCI3/SC7) to learn and friction fluid sealing technical committee.
3 consolidation and development phase (1981-1990)
The hydraulic system of the domestic engineering machinery main products work pressure reached 16-40MPa, the sealing system uses the seal form with rubber seal products. The main types are: O ring (NBR, FKM); floating seals for crawler chassis (Fig. ten O shaped metal ring); sealing component lubrication sealed track (NBR+AU): inner frame and an outer frame rotary oil ten (NBR, FKM, ACM, EPDM); combined sealing washer (NBR+ metal); the hydraulic cylinder piston and piston. A coaxial seal assembly (PTFE+NBR); the axis of rotation with hydraulic oil reflux (NBR, FKM, ACM); and the working pressure is a pressure type rotary oil seal 13MPa (NBR, FKM); two-way medium rotary oil seal (NBR, FKM), with a supporting ring double acting reciprocating dynamic seal pressure cylinder piston assembly D liquid O (NBR+PTFE+POM) etc..
4 high speed development stage (after 1991)
Construction machinery and other medium and high pressure hydraulic industry has introduced a large number of product manufacturing technology, to promote the pace of foreign seals into the Chinese seal market. The entry of foreign capital and technology has improved the overall level of China's seal industry. Mechanical seal