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日本古河JTH3RS-135型凿岩台车上有3个臂,每个臂有一套独立的液压系统。该机具有凿岩速度快、操作轻便等优点,在使用过程中曾出现以下两例故障。 I.操作综合操纵阀时,进给缸没有向后进给的动作 故障现象为:操作3＃臂综合操纵阀7时,进给缸没有向后进给的动作。该台车凿岩控制回路如附图所示。 （1）阀杆控制回路 阀杆控制回路为:进给/提升泵1→减压阀13→综合操纵阀7→电磁阀10→梭阀C3→梭阀C4→旋转控制阀20（旋转马达33正转）。
Japan Furukawa JTH3RS-135 drilling rig has three arms, each arm has a separate hydraulic system. The machine has a rock drilling speed, light operation and other advantages, in the course of the following two cases of failure occurred. I. When operating the integrated control valve, the feed cylinder does not feed backward. The fault phenomenon is as follows: When operating the integrated control valve 7, the feed cylinder does not feed backward. The trolley rock control loop as shown in the figure. (1) Stem control circuit The stem control circuit is: Feed / lift pump 1 → Pressure reducing valve 13 → Integrated control valve 7 → Solenoid valve 10 → Shuttle valve C3 → Shuttle valve C4 → Rotation control valve 20 (Rotary motor 33 Forward).