About us

The Zhengzhou Coal Mining Machinery Group Company Limited (ZMJ) was founded in 1958 in Zhengzhou, China. We are one of the world leading manufacturers of longwall mining system. Our key business is to develop and manufacture hydraulic roof supports, with supporting height from 0.55m to 8.5m and supporting force from 1600KN to 21000KN. By far we are the largest hydraulic roof support manufacturer in the world. In 2012, a total number of around 22,000 units of supports were manufactured and shipped to our customers all over the world. more


The ZMJ Germany GmbH, a wholly owned subsidiary of ZMJ Group, was founded in 2013 in Düsseldorf, Germany.




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