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在用材料试验机进行压缩试验时,为了控制好加载速度,需要了解试验机是否已施加上载荷,以便迅速调整送油阀的大小,为此我们在改造一台原东德产30t(300kN)材料试验机电气部分时,加装了加载指示灯装置,它能迅速、准确地告知操作者,试验机是否已施加上载荷.根据摆锤式试验机的工作原理,当给试样施加上载荷时,摆杆离开铅垂位置.因此,我们把摆杆作为指示灯亮、熄的控制机构.选一微动开关,用它的一对常闭触点,使它在摆杆离开铅垂位置(试验机刚加上载荷)时,电路处于闭合状态,此时指示灯亮,表明试验机开始施加载荷;当试验机未施加载荷时,摆杆在铅垂位置,开关处于断开状态,指示灯不亮,表明试验机未开始加载.电路原理如图1所示.
In the material testing machine for compression test, in order to control the loading speed, you need to know whether the test machine has been imposed on the load in order to quickly adjust the size of the valve, we are in the transformation of a former East German 30t (300kN) material Test machine electrical part, the installation of a load indicator light device, which can quickly and accurately tell the operator, the test machine has been imposed on the load.According to the working principle of the pendulum test machine, when the load is applied to the sample , Put the pendulum lever in the vertical position, so we put the pendulum rod as the control mechanism of the indicator light on and off, choose a micro switch and use it’s pair of normally closed contacts to make it move away from the vertical position Machine just add the load), the circuit is closed, then the light is on, indicating that the test machine to start the load; when the test machine is not applied load, the pendulum in the vertical position, the switch is off, the indicator is not lit , Indicating that the test machine did not start loading circuit principle shown in Figure 1.