On the afternoon of November 11th, a batch of refuge chamber sealed doors ordered by shanxi's merchant,were formal loaded after acceptance, and would sent to a coal mine of Changzhi of Shanxi province.
Refuge chamber sealed doors were independently produced by Shandong China Coal Group, and have a series of virtues such as flexible switch, speedy, reliable, sealing air and water,and high strength. It is not only easy to install but also can prevent visible and invisible wastage and stand the shock wave of 1.0 MPa. Meanwhile,sealed door shields people from toxic or harmful gases. With emergency door and observation window, service life is more than 10 years. At present, the products have obtained national utility model patent certificate, and meet the national standards. 

For many years,  with the operation philosophy of "Survive on quality, development on service.",  almost 100 kinds of mining machinery products have gained the national coal security certificate and national utility model patent certificate.  China Coal Group have built up long-term cooperation allied relationship with many mining enterprises . At present,our mining machinery products have sold to 34 provinces and autonomous regions and market share has kept in one of the leading position within China's market. China Coal Group sets a new benchmark for the development of national mining enterprises.