Zhengzhou Zhongyuan Hengrui Machinery Factory is a designated enterprise by the Ministry of Coal for the support and manufacture of protection products. We are a joint-stock company combining the research and development, manufacture and sale. Hengrui strictly adheres to international industrial standard and manufactures and sells spray equipment, gunite machines, shotcrete machines, grouting machines, hose pumps, hydraulic spraying machines, artificial soil spraying seeders and series of ...