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试验机开机后,关闭回油阀,但主机工作活塞不上升、或上升速度慢、或装夹试样加不到最大负荷。对上述情况,可先对试验机进行外观检查,如油管接头是否漏油,油管有无破裂部位等。这些检查如未发现问题,可再把测力机构外壳的侧门打开,检查回油阀的泄油管、送油阀的溢流管、主机工作油缸的泄油管的泄漏情况,判断问题所在。 (1)如果回油阀手柄已旋紧,其泄油管仍有油液流出,说明回油阀关不严,即回油针和阀体间密封不好,可将油针螺母旋开一周,并将油针手柄向里旋紧,然后用搬手用力向里旋紧螺母套,此时,再关闭回油阀手柄,
Test machine boot, turn off the oil return valve, but the host does not increase the working piston, or slow rise, or less than the maximum load clamping specimen. For the above situation, the appearance of the testing machine can be checked firstly, for example, if the oil pipe joint is leaking oil or if the oil pipe has a broken part or the like. If no problems are found in these inspections, then the side door of the force-measuring mechanism housing can be opened to check the leakage of the oil return valve, the overflow pipe of the oil-sending valve and the leakage of the drain pipe of the main work oil cylinder to determine the problem. (1) If the oil return valve handle has been tightened, the oil drain pipe is still out of oil, indicating the valve back to the valve is not strict, that is, back to the oil and the valve body seal is not good, you can unscrew the oil needle nut a week, And the oil needle handle tightened to the inside, and then force the hand to tighten the nut sets, this time, then close the return valve handle,