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1.故障现象1台WK-75型矿用挖掘机,其液压驱动的电缆卷筒发生不能转动故障。故障发生后,检查压力表读数为零;调节先导式溢流阀调压杆,压力表读数仍为零。将变量泵的工作压力和流量调高后,压力表有读数,卷筒马达可以转动,但是将变量泵调回到规定的工作压力和流量后,卷筒马达仍不能转动。2.液压系统(1)组成该型挖掘机电缆卷筒液压系统主要由液压油箱1、液压油滤清器2、球阀(3、13)、变量泵4、单向阀5、调速阀6、压力表7、三位四通换向阀8、卷筒马达9、先导式溢流阀10、
1. Symptom 1 WK-75 excavator, hydraulic drive cable reel can not rotate failure. After the fault, check the pressure gauge reading is zero; adjust the pilot relief valve pressure regulator, pressure gauge reading is still zero. After the working pressure and flow rate of the variable displacement pump are increased, the pressure gauge has a reading and the drum motor can rotate. However, after the variable displacement pump is adjusted back to the specified working pressure and flow rate, the drum motor can not rotate. 2. Hydraulic system (1) This type of excavator cable reel hydraulic system is mainly composed of hydraulic tank 1, hydraulic oil filter 2, ball valve (3,13), variable pump 4, check valve 5, speed control valve 6 , Pressure gauge 7, three four-way valve 8, the drum motor 9, the pilot relief valve 10,