Hydraulic universal testing machine common faults - Database & Sql Blog Articles

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Fault one:

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

1. The pulley on the rack and its track are too dusty and rusted. At this point you need to remove the cleaning, plus a little watch oil.

2. The pointer rotates the shaft dirty and should be cleaned.

3. There is contact between the racker and the rack and should be loosened.

4. The buffer return oil is not good and should be adjusted or cleaned.

5. The belt on the force measuring piston is loose or too loose (so that the piston cannot run at a constant speed).

6. The force of the piston in the cylinder is increased or stuck in the cylinder, and the chrome oxide paste is applied to the grinding until normal.

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

Fault 2:

Hydraulic universal testing machine

When doing the tensile test, the sample fracture is always broken on both sides. The reason for this phenomenon should first be considered whether the main part of the test machine is installed vertically. If this reason is excluded, it will be excluded from the following three aspects.

1. When the jaws are not clamped, the specimens should be clamped symmetrically as required.

2. The quality of the jaws is inferior and the teeth are damaged. In addition to affecting the different cores of the jaws, the specimens are slipped during the test, making the yield point difficult to identify. 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 concentric. A test rod shall be machined, and the upper and lower jaws shall be tensioned and measured with a dial gauge based on the two force columns until the adjustment is passed.

Fault three:

The position of the pendulum is not normal, and the pendulum is not allowed to be vertically marked.

The main reason is that the viscosity of the oil is too large or the oil is too dirty. Remedy: Replace the oil with the right viscosity.

The force measuring piston rotates with a large friction or does not rotate. Remedy: Check if the test machine is level and eliminate the failure of the force measuring piston.

There is unstable friction. Remedy: Clean the pendulum shaft bearing, the toothed rod, the pointer, the wire wheel, adjust the level of the testing machine, and reduce the unstable friction.

Fault four:

The passive needle does not stop well at any position and does not coincide with the main needle. The method of removal is to remove the dial glass, adjust the passive needle compression spring screw, and adjust the pointer to coincide with the main needle.

Fault five:

When loading, the oil system leaks heavily or the tubing ruptures. First, check if the joints of the oil system are tightened. If it is necessary to replace the gasket, replace it in time. If the tubing is broken, it is necessary to replace the tubing with higher strength. In addition, observe the oil delivery valve and whether the relief valve piston is dead or reversed.