论文部分内容阅读
通过计算方法确定钻井泵泵阀与阀座冲击力时，计算结果多不精确。提出了采用应变测试技术测定冲击力的方法。测试时，将应变片贴在阀座的4个筋板两侧面中间中性轴附近，并与阀座轴线呈45°角，筋板上的应变片串接在一个桥臂上，4个桥臂上的电阻值相等。为使阀座筋板中间截面的中性轴附近材料处于纯剪切应力状态，加工时使阀座导向套上端面高出筋板上表面0．5－1mm，使阀体下落时仅与导向套上表面接触。测试结果表明，电测方法对测定泵阀关闭时的冲击力是可行的。
Calculating method to determine the drilling pump valve seat and the impact, the calculation results are not accurate. A method of measuring impact force using strain test technique is proposed. Test, the strain gauge attached to the seat on both sides of the four sides of the neutral axis near the neutral axis and the valve seat axis at 45 ° angle, the strain gauges on the ribs in series on a bridge arm, four bridges The resistance on the arm is equal. In order to make the material near the neutral axis of the middle section of the valve seat rib in a state of pure shear stress, the upper end surface of the guide seat of the valve seat is 0.5-1 mm above the upper surface of the rib plate when machining, Set on the surface contact. The test results show that the electrical measurement method is feasible for measuring the impact force when the valve is closed.