人力操纵的试验机夹具;在夹持试样时,劳动强度大、生产效率低。有时因夹力不足、试验中途拉力试样脱落,引起示值不准。为此,我们对WI-100型试验机夹具进行了改革,初步革新成功了液压式强力自动夹具。一、结构与工作原理液压夹具是由电机、油泵、工作油缸、阀门及原机夹板组成。结构原理示于图1。工作时先接通电源,使电机带动油泵2,此时压力油经单向阀3到压力表4、溢流阀5、泄荷阀6、电磁阀7和8,把油送到工作油缸9和10,进而推动活塞杆上升,顶住夹 Manually-operated tester jigs; labor-intensive and low-productivity when holding specimens. Sometimes, due to lack of clamping force, the pull-out of the specimen in the middle of the test causes the indication to be inaccurate. To this end, we have reformed the fixtures of the WI-100 test machine, and initially succeeded in the innovation of hydraulic powerful automatic fixtures. First, structure and working principle Hydraulic fixture is composed of motor, oil pump, working oil cylinder, valve and original machine splint. The structural principle is shown in Figure 1. When working, the power supply is firstly connected, so that the motor drives the oil pump 2. At this time, the pressure oil passes through the check valve 3 to the pressure gauge 4, the relief valve 5, the discharge valve 6, the solenoid valves 7 and 8, and the oil is sent to the working cylinder 9 And 10, which in turn pushes the piston rod up, holding the clip