China’s current mining machinery industry has introduced a large number of mainframe design and manufacturing technology from development countries. It gradually adopted international advanced sealing system and sealing devices application technology. But because the restriction of domestic Raymond mill manufacturing level, our sealing technology has behind the international advanced level in about 20 to 25 years. Host no leakage normal work hours only around 400 h, less than 1/10 of the international advanced level. Application status: domestic Raymond mill is still not able to satisfy the demand of advanced manufacturing technology and the development of mining machinery industry. In fact, in China there are nearly one thousand Raymond producers, but with better production conditions and technological capabilities of enterprises is only more than 40, Which has a strong technical capability, with complete sets of advanced equipment, only 7-8 companies (engaged in the production of military products, sealing their professional institute is not included). Nevertheless,China sand washers these companies production of sealing Flotation separator font-size: 11pt">products in quality and service life is still with more or less gap with advanced level. Second, the considerable demand small u-shaped cross-section ring (AU) used in the dump truck is still bought from foreign companies for the poor quality sealing products in the domestic. For 20 years, Stone jaw crusher font-size: 11pt">the national research and technical staff work together to create a complete integration of the various types of ISO/TC131/SC7 national standards Raymond installation system. They also established various Raymond international standards of size, performance and appearance quality, packaging, storage, transportation, etc. thus facilitate the mining machinery and other,Flotation separator high-pressure hydraulic machinery sealing system use the Raymond mill. But in practice, there are still many shortcomings exist. The main reason is too weak industrial base, the quality and variety of raw materials is not satisfactory, management is not standardized, and so on. Especially the hydraulic pump, hydraulic motor and gearbox sealing quality are the worst. For the life of Raymond, the author has done a comparative test. A unit developed by the domestic oil seal, installed after the road test after only 50km began to leak, while installed capacity assessment of a foreign company seal, the use of the past three years has not leaked. Another example: mining machinery sealing elements of hydraulic cylinders move the quality level to meet the 5000 foreign leak for hours, while the domestic life of Raymond general for 1 / 10, some even less than 100 hours of work. China sand washer:www.china-crusher.com/sand-washer3.html
Belt conveyor:www.china-crusher.com/belt-conveyor1.html
China impact crusher:www.china-crusher.com/impact-breaker1.html
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