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In the early loading methods of standard test pointer pin manufacturers, ordinary AC motors were mainly used to drive the transmission system, and the loading speed was not adjustable. For springs and other elastic parts, due to the tensile stress, data is automatically recorded during rapid compression, while data is automatically recorded during slow compression or static compression. These two data are very different. Nowadays, such as the transmission system. B. The AC servo speed control system is often used to truly simulate the working state of the spring. In fact, the internal tension of the spring in this state is measured to form the basis of the spring structure.

Care must be taken when purchasing a spring fatigue testing machine. Generally, the spring used for the standard test pointer pin for testing is used in more important places. If the spring fails, it will have a big impact, so a qualified spring fatigue test opportunity will have a significant impact on the company.
1. The indicator pointer of the spring fatigue testing machine cannot move normally: When the load is loaded, the pointer moves quickly and slowly. There may be air in the buffer cylinder, so the air should be cleared in time. Uneven placement of the fuselage can also cause this problem. Adjust the hull in time.
2. The pointer of the test machine does not move: the buffer may be closed. Make sure to adjust the buffer. The other is that the length of the boom must be adjusted without increasing the load.
3. Pointer rebound: After the main load is loaded, there will be a rebound state. First of all, the buffer oil is insufficient, and gas needs to be added to remove the gas. The second reason is that the loading handle is loose and needs to be tightened. After the main load is loaded, the pointer will jump. Check whether the ball socket, ball socket and large lever of the hanger are greasy. You need to remove the grease on the joints.
4. Pointer trembling: After adding the main load, the pointer trembling. There may be oil on the tray. Pay attention to cleanliness. Due to the unevenness of the hull, the water level must be calibrated. The pointer trembles after applying pre-tightening force, mainly because the flat key and long keyway of the lifting screw are loose, and the flat key needs to be replaced.
5. The pointer with the main load moves too fast or too slow: The pointer moves too fast for two reasons: First, the buffer may lack oil and must be refilled and emptied; second, the buffer stops oil The needle is in the larger open position. The position of the oil needle should be readjusted.