Hydraulic universal material testing machine common fault

List several common faults:

One: The dial pointer has poor sensitivity, there is a stoppage phenomenon after unloading, or the zero position often changes. There are many reasons for this phenomenon.

1. The pulley on the gear rod and its rails are dusty and rusted. At this point need to remove clean, add a little clock oil.

2. The pointer shaft is dirty and should be cleaned.

3. The contact between the pinion and the pinion should be loosened.

4. Buffer oil return situation is bad, should be adjusted or cleaned.

5. The belt on the force measuring piston is off or too loose (makes the piston unable to run at a constant speed).

6. The friction force of the force measuring piston is increased or stuck in the cylinder, and the chromium oxide paste is used for research until it is normal.

7. The pendulum has obstructions in the lifting process, or the shaft is dirty or rusted, causing the pointer to change back to zero.

II: At the time of loading, the oil system leaked heavily or the tubing ruptured.

First of all, check whether the joints of the oil system are tightened. If it is necessary to replace the gasket, replace it in time. If the tubing ruptures, then a higher-strength tubing needs to be replaced. In addition, the delivery valve must be observed and the overflow valve piston should be top dead or reversed.

Three: The position of the pendulum is not normal, and the pendulum cannot be vertically marked.

The main reason is that the viscosity of the oil is too large or the oil is dirty. Remedy: Replace the oil with the proper viscosity. Forced piston rotation has greater friction or does not rotate. Remedy: Check whether the test machine is horizontal and eliminate the failure of the measuring piston. There is unstable friction.