Application and function of hydraulic universal material testing machine We have been in the testing machine industry for many years, and have a comprehensive understanding of the series of problems, about a few days of common faults:
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 excessively dusty and rusted. At this point you need to remove the cleaning, plus a little watch oil.
2. The pointer rotation shaft is 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 detached or too loose (so that the piston cannot run at a constant speed).
6. The friction force of the force measuring piston in the cylinder increases or is stuck, 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.
Two: When loading, the oil system is seriously leaking or the tubing is broken.
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, then 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.
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 test machine, and reduce the unstable friction.
The hammer is not normal, and it is fast and slow. Normally, the buffer can be rotated to the proper position. However, if the oil hole of the damper is clogged, or if the ball of the buffer valve and the inlet contact portion are excessively smeared or the gap is too large, the damper may be disabled. The solution is to clean the buffer valve and adjust the gap between the steel ball and the valve seat to be about 0.5mm. Place the oil needle knob to reduce the gap between the needle and the valve body and re-list the ABCç £ mark. Also, when the temperature influence is large, the oil can be appropriately replaced.
Four: After the sample breaks, the pendulum quickly falls back, causing an impact.
The main reason is that the buffer is out of order. In addition to the conventional adjustment, it should also be considered whether the oil is too thin or too dirty.
Five: 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.
Six: When doing the tensile test, the sample fracture is always broken on both sides. The cause of this phenomenon should first be considered whether the main part of the test machine is installed vertically. If this reason is excluded, the following three aspects are excluded.
1. When the jaws are not clamped, the specimens should be clamped symmetrically as required.
2. 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.
3. 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. Http://news.chinawj.com.cn Submission:
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