The hydraulic universal testing machine uses high-strength light bars to fix the upper beam and the work surface to form a high-rigidity portal frame structure. Driven by a servo motor, the servo motor drives the moving beam to move up and down through a transmission mechanism to realize the test loading process. It is divided into two types of single-space and double-space models. The main machine adopts the advanced DSCC-1 all-digital closed-loop control system for control and measurement. The computer is used for dynamic display of the test process and test curve, and for data processing. After the test is over, the curve can be enlarged through the graphic processing module for data re- Analysis and editing.

      First affect the oil pipe connection of the afterburner part and the force measuring part. The manufacturer of the testing machine basically limits the position of the formed bend of the inlet and return pipes. Therefore, the oil pipe connection of the afterburner part and the force measuring part will be affected by The position and vertical deviation of the two installations are affected. The first thing is the combination of the oil pipe and the oil inlet and return valve and the oil cylinder, and the second thing is whether the interface is leaking.

      Because of the oil leakage of the testing machine, the voltage stabilization performance of the testing machine cannot be guaranteed. The accuracy of the data of the multi-point strain measurement under the constant load of the bending test cannot be guaranteed. The oil inlet valve cannot be completely closed. In order to ensure the stabilization, the oil inlet valve must be used Open slightly to ensure that the oil intake is equal to the oil leakage. This requires frequent opening and closing of the oil intake valve, which aggravates the wear of the valve fj, thus aggravating the oil leakage. The greater the load, the more serious the oil leakage will be, forming a vicious cycle The difficulty of completing the test increases.

      The verticality error of the left installation will affect the zero adjustment problem before the test machine is working, because the adjustment of the balance pendulum needs to ensure the plumbness of the pendulum, which affects the angle of the lever that pushes down the horizontal tooth, and then affects the magnitude of the force value. Affect the elevation angle of the horizontal rack. Affect the correct reset of the force measuring pointer. The thrust of the piston of the force measuring cylinder to the force transfer rod will cause errors in the installation accuracy of the testing machine. The universal testing machine, as the main equipment for material mechanics experiment teaching, is relatively expensive.