Common failures of intelligent pendulum impact instrument, solutions to pendulum impact instrument problems

Intelligent pendulum impact instrument FIT-01 is suitable for measuring the impact strength of plastic films, composite films, sheets and other materials, and is widely used in large enterprises, quality inspection agencies and other institutions.

Smart Pendulum Impact Tester

The smart pendulum impact instrument often encounters some small faults during use, what are the common faults? Today, I will take you to find out.

1. The dial pointer has poor sensitivity, and it stops halfway after unloading, or the zero position often changes

There are many reasons for this phenomenon.

1. Excessive dust and rust on the pulley and its track on the rack. At this time, it needs to be removed and cleaned, and then a little watch oil;

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

3. There is contact between the tooth bar pressing piece and the tooth bar, it should be adjusted loosely;

4. The oil return condition of the buffer should be adjusted or cleaned;

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

6. If the friction force of the force measuring piston increases or becomes stuck in the cylinder, apply chromium oxide abrasive paste to the grinding until it is normal;

7. The pendulum has obstructions during the raising process, or the pendulum shaft is too dirty or rusted, which makes the pointer return to zero change greatly.

2. When doing a 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 testing machine is installed vertically or not. If this reason is eliminated, then the following three aspects should be eliminated.

1. The jaws are not positioned correctly when clamping, the sample should be clamped symmetrically with the jaws as required;

2. The quality of jaws is poor and the teeth are damaged, which not only affects the misalignment of jaws, but also makes the sample slip during the test, making it difficult to identify the yield point. At this time, the jaws should be replaced;

3. The lifting guide wheel is not adjusted correctly, so that the upper and lower jaws are not in the same direction. A test rod should be processed, and after the upper and lower jaws are tightened, measure with a dial indicator based on the two force columns until the adjustment is qualified.

3. The position of the pendulum is abnormal and the pendulum rod is not aligned with the vertical mark

The main reason is that the oil is too viscous or the oil is too dirty.

Remedy: Replace oil with suitable viscosity, and the force-measuring piston will rotate with greater friction or does not rotate. Check whether the impact testing machine is level, eliminate the failure of the force measuring piston, and there is unstable friction. Clean the pendulum shaft bearing, gear rod, pointer, wire wheel, adjust the level of the testing machine, and reduce the unstable friction.

Fourth, the hammer return is abnormal, sometimes fast and sometimes slow

Normally, just rotate the buffer to the proper position. However, if the oil hole of the buffer is blocked, or there is dirt or the gap between the steel ball of the buffer valve and the inlet is too large, the buffer will fail. The solution is to clean the buffer valve and adjust the gap between the steel ball and the valve seat at about 0.5mm. Place the oil needle knob to reduce the gap between the oil needle and the valve body, and relist the mound mark. Also, when the temperature influence is great, the oil can be changed appropriately.

5. The passive needle cannot stop at any position well, and it does not overlap with the main needle

The troubleshooting method is to remove the dial glass, adjust the passive needle pressure spring screw, and adjust the pointer so that it coincides with the main needle.

6. When loading, the oil system leaks severely or the oil pipe ruptures

Check whether the joints of the oil circuit system are tightened, if necessary, replace the gaskets in time. If the tubing is broken, you need to replace the tubing with a higher strength. In addition, you should also observe whether the fuel delivery valve and the relief valve piston are top dead or reversed.

7. After the sample is broken, the pendulum quickly falls back, causing an impact

The main reason is the failure of the buffer. In addition to regular adjustments, consideration should be given to whether the oil is too thin or too dirty.

In short, always pay attention to the problems found during the use of the smart pendulum impact instrument and eliminate them in time to avoid errors in your test results.