我厂原有一套吊挂式螺扣(东德WPM—20t上),在测合金钢和某些高强度的金属棒材的σ_P,σ_(0.2),σ_S时,经常碰到牙式夹具打滑而无法精确测量。因此,试验时需把夹头上的附件全部卸掉,另换上两块各11kg重的挂基块;试样头部需制成螺扣,所用辅助时间近30分钟,且更换繁琐,易损附件。为此,经研究我们设计插装,抽卸合开卡式夹具,无论是连杆式,弹簧式夹的卡板都可使用。装卸仅用一分钟。上夹头夹具靠两板自落合卡试样,然后开车把下夹头与上夹头调整好间距。用手向上推下夹具手柄扣合卡板,开动试验机受力指针移动说明试样已加上载荷,可放手,这时拉力与卡夹力在契型中成正比变化。右图分别为试样在上夹头及下夹头左半装入卡板 My factory original set of hanging screw (East German WPM-20t on), in the determination of alloy steel and some high-strength metal bar σ_P, σ_ (0.2), σ_S often encounter dental fixture slippage Without accurate measurement. Therefore, the test should be removed all the accessories on the chuck, and the other replaced by two 11kg heavy hanging blocks; sample head to be made into a screw, the auxiliary time used for nearly 30 minutes, and the replacement of cumbersome, easy Loss attachment. To this end, we study the design of the cartridge, draw-off open card clamps, whether it is connecting rod, spring clip card board can be used. Only a minute loading and unloading. On the chuck by two self-closing chuck sample, and then drive the lower chuck and the chuck to adjust the spacing. Push the handle upwards and push the handle downwards to clamp the board, and then start the test machine to move the pointer. The sample has been loaded with the load and can let go. At this moment, the pulling force and the clamping force change proportionally. Figure on the right are the samples in the upper chuck and the left chuck into the lower chuck