China Coal Zhangjiakou Coal Mining Machinery Co., Ltd(ZMM)., is a large comprehensive mechanical processing enterprises, with strong forging, casting, welding, metal cutting processing, heat treatment and other machinery manufacturing capabilities. Its producing ability is about 30 million tons of mechanical products annually Main products are conveyor, reducer, hydraulic coupling, Washing & separating coal equipment, water treating equipment, magnetic driving equipment, industrial chain, sling and other metal products. In 2006, ZJK bought the equipment, technology, patent and brand name from British Parsons Chain Company which produced industry chains for more than 100 years. Main products has exported to Britain, Australia, Russia, Turkey, and India etc. Industry chains are exported to USA ，Japan，Argentina and many other countries in the world since 1985. ZMM is in a leading position in China domestic industry trade, and well-known in world industry trade.