Calculation of speed control of hydraulic universal test machine

CommonHydraulic universal testing machineIt is a manual operation, and the test speed is controlled by rotating the opening size of the oil supply valve (oil inlet) and oil return valve (oil return). Since there is no specific scale for manual operation, there is no rotation angle indication, etc., it is troublesome to operate and not easy to master. The following will introduce the WE-600D model in detail. Generally speaking, the oil feeding valve handle rotates for one round, the valve needle moves forward and backwards by 1mm, and the valve hole diameter is 10mm. Therefore, the valve hole opening area is: where: d: the valve hole diameter, p: the valve needle pitch; the test speed can be calculated in detail based on the flow rate of the oil pump, the valve hole area, and the cylinder diameter. The oil return valve bore diameter is much larger than the oil delivery valve bore diameter. When the oil return valve is opened, the oil pressure will be removed quickly and can be returned quickly. I will not repeat it here.http://www.hssdtest.com/