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煤矿引风道内使用的控制风门多为水平推拉风门、垂直升降风门或蝶阀控制型风门,前2种风门均有大部份暴露在引风道外,经日晒雨淋,其滑行轨道易生锈和积存杂物,导致风门不能正常开闭,给矿井安全通风造成重大隐患。水平推拉风门和垂直升降风门其滑行轨道间隙大,造成主通风机外部漏风多,降低了实际通风量。蝶阀控制型风门安装在引风道内,能避免外部漏风,但其传动机构为涡轮蜗杆式,蝶阀开启时蝶阀片不能准确平行于风流方向,会
The control damper used in the coal mine air duct is mostly the horizontal push-pull damper, the vertical lift damper or the butterfly valve-controlled damper. Most of the first two kinds of damper are exposed outside the lead air duct, and the sliding track is prone to rust And accumulate debris, resulting in the damper can not be normally open and close, to the mine safety and ventilation caused major risks. Horizontal push and pull the vertical sliding door and its slide rail clearance, resulting in more leakage outside the main ventilator, reducing the actual amount of ventilation. Butterfly valve control damper installed in the air duct, to avoid external air leakage, but the transmission mechanism for the worm-type butterfly valve is opened, the butterfly valve can not be accurately parallel to the direction of the wind will be