MMB waterproof closed doors, closed doors coal quality will have a market, there will be progress has improved, the company developed a waterproof MMB closed doors, are strict in quality, technology, painting and so on. With further progress will be away from success, our aim is to mine the best waterproof door back to the customer! MMB closed doors waterproof structure: 1, the doors closed doors are welded flat steel, Tic Tac Toe ribs and other parts of the ring beam combination. 2, the door is closed the door frame channel and beam formed by a combination of a frame structure. 3, the closed doors of the tensioning device uses a wedge-shaped slider. 4, door hinge closed doors Rolling rely as support. MMB waterproof closed doors precautions? Concentration (1) check on the construction site of the gas, carbon dioxide and other harmful gases. Construction site must be well ventilated, gas, carbon dioxide concentration does not exceed the "Coal Mine Safety Regulations" requirement. ? (2) supporting the roof construction sites before and after the examination, Lane 5m to help, identify problems and timely reporting, processing, before construction after no risks. ? (3) of the wall surrounding To re undercutting see hardtop, and with the help of hard coal and rock solid connection; no cracks in the walls smooth, heavy and empty sewn seam. I look forward to your expensive electricity.