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一台哈尔滨产QLY50型起重机,在一次装卸作业过程中,升钩动作突然失灵,无法正常作业,初步判断是电控系统故障引起的。该机卷扬电控系统如附图所示。1.原理分析(1)升钩继电器当进行卷扬操作时,电流经保险F流至升钩继电器K1,当升钩限位开关SA处于闭合状态时,继电器K1线圈形成回
A Harbin QLY50 cranes, loading and unloading operations in the process, the sudden rise of the hook action failure, unable to work properly, the initial judgment is caused by electronic control system failure. The machine winch electric control system as shown in the figure. 1. Principle Analysis (1) Lifting hook relay When winding operation, the current flows through the fuse F to lift hook relay K1, when the hook limit switch SA is closed, the relay K1 coil is formed back