在工矿企业中 ,起重机被广泛使用。桥、门式起重机的小车与大车之间、大车与厂房之间均有相对运动 ,大、小车通常是由角钢等刚性导体组成的硬滑线来实现供电的。由于角钢滑线通常布置成水平面和导电拖板相接触 ,这样就会使滑线上面经常有积灰 ,尤其是铸造、炼钢、炼铁等粉尘较? In industrial and mining enterprises, cranes are widely used. Bridge, gantry crane between the car and the cart, between the cart and the workshop have relative motion, large, car usually consists of rigid conductors such as angle steel hard sliding line to achieve the power supply. As the angle of the steel slide is usually arranged in horizontal contact with the conductive pallet, so that the slide will often have fouling, especially in the casting, steelmaking, iron and other dust?