The current Chinese construction machinery industry has introduced a large number of host countries design and manufacturing technology, and gradually adopt the international advanced sealing system seals the application of ideas and technology. However, due to the level of domestic industrial manufacturing seals constraints, engineering mechanical seal technology level is still lagging behind the international advanced level of about 20-25 years. Normal working hours without leakage host 400h only about the international advanced level of less than 1 / 10.

     Application: Domestic varieties of seal products and the quality is still unable to meet the introduction of advanced manufacturing technology and supporting the development of construction machinery needs

     In fact, in China's construction machinery industry services for the rubber seals have nearly one thousand enterprises, but with better production conditions and technological capacity of enterprises is only 40, which has strong technical capabilities, with complete sets of advanced equipment of the enterprises only 7-8 at home (in the military, Institute of seal products is not a professional production of their series). However, the production of sealing products of these enterprises in terms of quality and life there is still more or less with foreign advanced level of the gap. Construction machinery and in the introduction of high-pressure hydraulic components industry, such as Linde, Carter, Komatsu, ZF words, Rexroth, and other world renowned manufacturers of manufacturing technology, the domestic varieties of seal products, and quality can not meet the introduction of advanced manufacturing technology products And supporting the development needs of a case in point. Secondly, demand considerable dump truck lifting device with a small cross-section U-shaped ring (AU), the domestic poor quality sealing products, OEMs and users are purchasing from foreign companies.