一台徐重产QY25E型起重机在起吊作业时存在不能制动的现象,即在起吊重物时拉动操作杆后重物需先下降一点后才能开始上升——溜钩。该机为二手货,随机文件全无,故维修困难。拆开起重机外挡板发现,该机采用的是行星齿轮减速卷扬机,马达107和弹簧常闭液压开启式卷扬制动器,制动液压回路由单向阀和电磁换向阀等组成。 A Xu heavy QY25E cranes in the lifting operation there is a phenomenon that can not be braked, that is, lifting the heavy object when pulling the lever after heavy objects need to drop a little before they can start to rise - slippery hook. This machine is second-hand goods, no random files, so maintenance is difficult. Open the crane baffle found that the machine uses a planetary gear deceleration winch, the motor 107 and spring normally closed hydraulic hoist brakes open, the brake hydraulic circuit from one-way valve and solenoid valve and other components.