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The reason why the four-column hydraulic press is noisy when working

by:WORLD     2022-10-20
The reason why the four-column hydraulic press is noisy when working

1. The relief valve is unstable, for example, the valve core is stuck due to improper matching between the spool valve and the valve hole, or the contact between the poppet valve and the valve seat is blocked by dirt, the damping hole is blocked, the spring is skewed or fails, etc. Or it may not move well in the valve hole, causing system pressure fluctuation and noise. In this regard, attention should be paid to cleaning and dredging the negative hole; check the overflow valve, and repair or replace it in time if it is found to be damaged, or due to wear exceeding the regulations;

2. The quality of the hydraulic pump or hydraulic motor is not good, which is usually the main part of the noise in the hydraulic transmission. The main reasons for the noise are the poor manufacturing quality of the hydraulic pump of the small hydraulic press for game coin forming, the accuracy does not meet the technical requirements, the pressure and flow fluctuate greatly, the phenomenon of oil trapping is not well eliminated, the sealing is not good, and the bearing quality is poor. . In use, due to the wear of hydraulic pump parts, the gap is too large, the flow is insufficient, and the pressure is easy to fluctuate, which will also cause noise. In the face of the above reasons, one is to choose a high-quality hydraulic pump or hydraulic motor, and the other is to strengthen repair and maintenance. For example, if the tooth profile accuracy of the gear is low, the gear should be ground to meet the contact surface requirements; if the vane pump has oil trapped , the triangular groove of the oil distribution plate should be corrected to eliminate trapped oil; if the axial clearance of the hydraulic pump is too large and the oil delivery volume is insufficient, it should be repaired so that the axial clearance is within the allowable range; if the hydraulic pump is not selected correctly, it should be replace

3. Air intrusion into the hydraulic system is the main cause of noise. Because when the hydraulic system of the gaming coin forming small hydraulic press invades the air, its volume is larger in the low-pressure area. When it flows into the high-pressure area, it is compressed and the volume suddenly shrinks. When it flows into the low-pressure area, the volume suddenly increases. The sudden change of , produces the phenomenon of 'explosion', which produces noise, which is usually called 'hole'. For this reason, a venting device is often provided on the hydraulic cylinder for venting. In addition, after driving, it is also a common method to make the actuator reciprocate several times with a rapid full stroke;

4. Improper adjustment of the reversing valve will cause the spool of the reversing valve to move too fast, resulting in reversing impact, resulting in noise and vibration. In this case, if the reversing valve of the small hydraulic machine for game coin molding is a hydraulic reversing valve, the throttling element in the control oil circuit should be adjusted to make the reversing smooth and without impact. When working, the spool of the hydraulic valve is supported on the spring. When its frequency is similar to the pulsation frequency of the oil delivery rate of the hydraulic pump or the frequency of other vibration sources, it will cause vibration and generate noise. At this time, by changing the natural frequency of the pipeline system, changing the position of the control valve or adding an accumulator appropriately, it can prevent vibration and noise. This article comes from the hydraulic manufacturer WORLD Press Machine official website, please indicate the source for reprinting!

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