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该阀安装在QD—25C爆破孔钻机上,作为支腿油缸和立塔油缸的液压锁。实践证明,它结构简单、性能可靠;兼有锁紧和过载保护作用。结构完全相同的上、下两阀Ⅰ、Ⅱ,装在油缸体(1)上。其结构如图1所示。主要由阀芯(2)、阀套(3)、单向阀座(5)、端盖(7)及调整垫(8)组成。A、B油口分别接通油缸上、下腔。E、R通换向阀进出口。职能符号如图2所示。当高压油以换向阀进入E时,推动上阀Ⅰ的单向阀座(5)向左移动,E和A通,油从E经A进入油缸上腔。同时高压油从E口进入
The valve is mounted on a QD-25C blasthole drilling rig as a hydraulic lock for leg cylinders and riser cylinders. Practice has proved that it has a simple structure, reliable performance; both locking and overload protection. The same structure of the upper and lower valve Ⅰ, Ⅱ, mounted on the cylinder body (1). The structure shown in Figure 1. The utility model is mainly composed of a valve core (2), a valve sleeve (3), a one-way valve seat (5), an end cap (7) and an adjusting pad (8). A, B were connected to the oil tank on the mouth, the lower chamber. E, R exchange valve inlet and outlet. Functional symbols shown in Figure 2. When the high-pressure oil into the valve E, push the check valve I seat (5) to the left, E and A pass, E through the oil from E into the upper chamber. At the same time high-pressure oil into the mouth from E