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Common faults:
The dial pointer has poor sensitivity and stops halfway 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 falls off or is 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. Apply chromium oxide paste to 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.
Common faults II:
When doing a tensile test, the specimen fracture always breaks on both sides. The reason for this phenomenon, first of all, should consider whether the installation of the main part of the test machine is vertical. If such reasons are excluded, then the following three aspects should be excluded.
1. The jaws are not placed positively when they are clamped. The jaws should be clamped symmetrically as required.
2. Poor quality jaws, damaged teeth, in addition to affect the jaws of different hearts, but also make the test sample slip, so that the yield point is difficult to identify. The jaws should be replaced at this time.
3. Lift guide wheel is not adjusted properly, so that the upper and lower jaws do not feel the same. A test bar shall be machined and the upper jaw and lower jaw shall be tightened. The two force columns shall be used as the basis for measurement with a dial indicator until the adjustment is qualified.
Common fault three:
The position of the pendulum is not normal and the pendulum is not allowed to mark vertically.
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 impact tester is horizontal and eliminate the failure of the force measuring piston.
There is unstable friction. Remedy: Clean the pendulum shaft bearings, gear rods, pointers, and reels, adjust the level of the test machine, and reduce the existence of unstable friction.
Common faults four:
Hammer return is not normal, when fast.
Normally, the bumper can be screwed into place. However, if the oil hole of the damper is clogged, or if the ball or the contact portion of the ball of the cushion valve is dirty or the clearance is too large, the shock absorber will be disabled. The solution is to clean the buffer valve and adjust the gap between the ball and the seat to about 0.5mm. Place the oil needle knob so that the gap between the oil needle and the valve body is reduced, and re-list the ABC mark. Also, when the temperature has a great influence, the oil can be properly replaced.
Common fault five:
Passive needles do not stop well in any position and do not coincide with the main needle.
The exclusion method is to remove the dial glass, adjust the passive needle compression spring screw, and adjust the pointer so that it coincides with the main needle.
Common fault six:
At the time of loading, the oil system leaked heavily or the tubing broke.
First of all, check whether the joints of the oil system are tightened. If there is a need 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.
Common fault seven:
After the specimen breaks, the pendulum quickly falls back, causing an impact.
The main problem is the failure of the buffer. In addition to routine adjustments, we should also consider whether the oil is too thin or dirty.
In short, we must always pay attention to the problems found during the use of the testing machine, and eliminate it in time so as not to make mistakes in your test results. It is the regular inspection of the testing machine to ensure the normal use of the testing machine.
Testing machine as a device to control the quality of the product, in the use of how to troubleshoot, ensure the machine is running well, the operator should learn to find problems and can be eliminated.