一台履带式起重机的卷扬机构采用片式常闭制动器,在空载或轻载提升时,制动器不能充分脱开,使制动器摩擦片处于滑磨状态,甚至引发卷扬机构剧烈振动,使其零部件受到冲击而极易损坏。1．故障原因分析由附图(a)知,改进前起升工作时,压力油通过手动换向阀6后分为两路,一路输入起升马达2的左侧油口;另一路进 The winding mechanism of a crawler crane adopts a plate type normally closed brake, which can not be fully disengaged during no-load or light-load lifting and makes the brake friction plate slippery and even cause the hoisting mechanism to vibrate violently to make its components Under attack and easily damaged. 1. Fault analysis (a), before improving the lifting work, the pressure oil through the manual valve 6 is divided into two, all the way into the left side of the lift motor 2 port; the other way into