Hot Search：Hole SealShaft SealRotating SealUniversal Plug

　　Rotary shaft lip seal ring (referred to as: Seal) is a kind of high science and technology of precision rubber sealing parts, it is through the flexible rubber or leather, plastic, etc.) seal and shaft contact to prevent lubricating oil or other medium leakage, such as shown in Figure 1. Early oil seal is made of leather and shaping, and after the Second World War the production of synthetic rubber oil seal use gradually increased, especially in recent decades, due to the rapid development of machinery manufacturing, automobile, aviation, aerospace and industry, on the seal proposed resistance to high temperature, high pressure resistance, medium resistance, adapt to the high speed, vibration and prolong service life of a series of harsh playing demand so as to promote the seal material, structure, performance testing, quality control means and sealing mechanism such as extensive and in-depth research, greatly improves the sealing performance and the service life of the oil seal. In the early 60 's, the fluid power oil seal, which has the effect of the back flow, has been developed. The technology of the oil seal has been greatly developed, and the sealing problem of some very difficult sealing parts has been solved. In the 1980s the United States has made of PTFE oil seal. It can not only be used in ultra high speed and high and low temperature resistance, resistance to a variety of corrosive medium, and is suitable for occasions with dry friction. 1980s international standard oil seal awarded flail implementation of the oil seal is applicable and interchangeability in the diaphragm, the various countries have reference to international standards to re enact the new national standard.
　　Installation position of rotary sealing ring
　　China in the oil seal of a late start, despite the considerable progress in recent years, but compared with the international level, in the structural design of products, rubber with technology, production technology, production equipment, mold processing, quality control means there is a big gap. At present, China's oil seal production, most of the distribution in the condition of relatively simple small business. Backward production techniques and equipment, coupled with thoughts on the seal of the high technology content and high precision lack enough understanding, technically on the performance requirements of the complexity and processing strict underestimated, coupled with lack of capital investment, leading to the quality of our country oil seal, sealing performance is reliable, short service life. Most of the production level of the manufacturer is only in the level of fifty or sixty years. Most of our high performance oil seal, mainly dependent on imports. On the other hand, due to the quality of the oil seal is not high, it also affects the competitiveness of China's machinery products in the international market. Therefore, seal in the whole and mechanical industry although accounted for the proportion of small, but it is the rubber industry in service a wide range and wide impact, social and economic benefits of huge, to the development of the national economy has an important role of a precision rubber seals, and its development should be highly valued.