Top plate type Roof coal is constituted by false roof, immediate roof and roof Roof support Monolithic pillar support, Hydraulic support, Bolt Support One pass and three defenses Mine ventilation is an important part of the “one pass and three defenses†work in coal mines. It is a prerequisite for safe production in a mine and is the top priority of our safe production work. Especially in a high gas mine like ours, how to do well ventilation work is particularly important, and it is a problem that every employee must care about. This time let me train everyone to train the ventilation. In fact, the company has given everyone and me a chance to learn together. I hope that everyone can cherish this opportunity, study hard and prepare for a new job. Mine ventilation Mine ventilation: The operation of continuously inputting fresh air and discharging dirty air into the mine is called mine ventilation. That is, Naxin spoke, the mine relies on ventilation power, and the quantitative fresh air is continuously input into the well along the established ventilation route to meet the needs of other wind-using locations such as mining, excavation working face, electromechanical chamber, gunpowder warehouse; At the same time, the used dirty air is continuously discharged to the ground. History of mine ventilators: Mine ventilation has undergone a long process of development. Around 1640, people began to separate the inlet and return lines to use natural ventilation for mine ventilation. Later, it began to heat in the return air to increase the natural ventilation capacity. The veterinary piston air pump was started in 1800. 1849 appears wind about 500m3 / min steam iron centrifugal mass Ventilator, 1898 Ventilator axial power put into use. In the 1940s, large mines of 1500-3000 KW have been used in foreign mines. Around the 1990s, China began to appear on the counter-fan fan, which was first used for the local fan and then used for the main fan. The basic task of mine ventilation: supply fresh air volume to mine to dilute and discharge downhole toxicity, asphyxiating and explosive gases and dust, to ensure that the quality (component, temperature and speed) and quantity of downhole wind flow meet national safety and health standards, and create good Work environment, to prevent various injuries and explosions, to ensure the health and safety of underground personnel, and to protect national resources and property. Mine ventilation is the most basic part of the production process of the mine. It always plays a very important role in the construction and production of the mine. Cylindrical Roller Bearing, Innovative Cylindrical Roller Bearing, Wooden Mobile Phone Stand LUOYANG AUTO BEARING CO.,LTD , https://www.ballbearing.nl