The Central Line of the positioning screw bolt and an outlet shaft lever are coherent basically in order to adjust the front and back position of the outlet shaft lever.
定位螺杆与出轴杆两者的中心线基本一致，用以调整出轴杆前后位置。
When the sending and exhausting shaft is ventilated, short duct flow may occurred between outlet and inlet, which will baffle air exchange in highway tunnel.
在竖井送排式通风时，排风口和送风口之间可能产生短道流动，这种短道流动会阻碍隧道内的空气交换。
Upper device — includes parts of upper casing, top cover, discharge outlet (with anti back feed plate), head shaft and backstop.
上部装置——有上部机壳、上罩、卸料口(装有防回料板)、头轴装配、逆止器等部件。
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