Common problems and methods during the testing process of universal testing machine

Fault 1:

Hydraulic universal testing machineWhen performing tensile tests, the sample fracture is often broken on both sides, which will always affect the test results and work efficiency. The reason for this phenomenon should first consider whether the installation of the main part of the test machine is vertical. If this reason is excluded, then it will be excluded from the following three aspects.

1. If the jaws are not placed in a straight position when clamping, the jaws should be clamped symmetrically as required.

2. The jaws are of poor quality and damage to the teeth. In addition to affecting the jaws, the sample is slipped during the test, making it difficult to identify the yield point. The jaws should be replaced at this time.

3. The lifting guide wheel is not adjusted properly, so that the upper and lower jaws are not centered. A test rod should be processed, and after the upper and lower jaws are tightened, use a dial gauge to measure with two force columns until the adjustment is qualified.

Fault 2:

The passive needle cannot stop well in any position and does not coincide with the main needle.

The removal method is to remove the dial glass, adjust the passive needle spring screw, and adjust the pointer to coincide with the main needle.

Fault Three:

After the sample breaks, the pendulum quickly falls back, causing an impact.

The main reason is that the buffer fails. In addition to adjusting according to conventional rules, you should also consider whether the oil is too thin and dirty.

Fault Four:

When loading, the oil circuit system will have serious oil leakage or the oil pipe will be broken.

First, check whether the joints of the oil circuit system are tightened. If you need to replace the gasket, replace it in time. If the oil pipe is broken, then the oil pipe with higher strength needs to be replaced. In addition, you must observe whether the oil supply valve and relief valve piston are pressed to death or are installed in reverse.