车轮轮辋弹性挡圈在自由状态时开口是闭合的。过去测量挡圈开口尺寸时,是用杠子撬开开口后再放到标准圆柱上测量开口间隙大小。用此法检测开口在装夹时费力又不方便。新的检验夹具采用气动胀开装置(图1),测量时,只要把零件放在夹具上打开气阀开关,气缸活塞带动锥体向下运动,使 The wheel rim retainer ring is closed when it is free. In the past to measure the size of the ring opening, is to open the mouth with a lever pry open and then placed on a standard cylinder to measure the size of the opening gap. Use this method to detect the opening in the clamping effort and inconvenience. The new test fixture with pneumatic expansion device (Figure 1), measurement, as long as the parts on the fixture to open the valve switch, the cylinder piston drive down the cone, so that