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1.故障现象1台QLYl560型轮胎起重机液压驱动的起升卷扬机发生不能转动故障。故障发生后,检查起升卷扬机液压系统压力表读数为零,卷扬机马达正、反转均无动作。2.起升卷扬机液压系统该轮胎起重机起升卷扬机液压系统主要由主泵1、压力表2、补油泵3、冲洗阀4、减速器5、起升卷扬机6、双向变量马达7、马达制动器8、单向阀9、电磁换向阀10、减压阀11、先导溢流阀12、高压过滤器13、先导泵14、吸油过滤器15、液压油箱16组成,如图1所示。
1. Symptom 1 QLYl560-type tire cranes hoist hydraulic drive hoist can not rotate failure. After the failure, check hoist hydraulic system pressure gauge reading is zero, hoist motor positive and negative no action. 2. Lifting hoist hydraulic system The tire hoist hoist hydraulic system consists of the main pump 1, pressure gauge 2, charge pump 3, flushing valve 4, reducer 5, hoist winch 6, two-way variable motor 7, the motor brake 8 , Check valve 9, solenoid valve 10, pressure reducing valve 11, pilot relief valve 12, high pressure filter 13, the pilot pump 14, the suction filter 15, the hydraulic tank 16 composition, shown in Figure 1.