Reasons and solutions for the loud noise of single column hydraulic press

(1) The equipment has been used for too long and noise occurs after the parts have aged;
(2) The single column hydraulic press hydraulic pump valve plate is damaged and the solenoid valve spring is damaged;
(3) Oil pressure sucks air, and the liquid contains air.
If a problem like (1) occurs, the easiest way is to replace it with a new single column hydraulic press, but if a problem occurs (2) (3), it will be more troublesome. In fact, the air in the liquid is also the main reason for the high noise of the single column hydraulic press. The following three points are specific:
First, the noise of single column hydraulic press relief valve
The relief valve is prone to high-frequency noise, which is mainly caused by the unstable performance of the pilot valve. That is, the noise is caused by air vibration caused by high-frequency oscillation of the pressure in the front chamber of the pilot valve. The main reasons are:
(1) Air is mixed into the oil, forming cavitation in the front chamber of the pilot valve and causing high-frequency noise. At this time, the air should be exhausted in time and prevent outside air from re-entering.
(2) The needle valve is excessively worn due to frequent opening during use, causing the needle valve cone surface and the valve seat to be unable to seal tightly, resulting in unstable pilot flow, pressure fluctuations and noise. At this time, it should be repaired or replaced in time.
Second, single column hydraulic press hydraulic pipeline noise
Too many dead bends in the pipeline or loose fixing clips can also cause vibration and noise. Therefore, dead bends should be avoided as much as possible in the pipeline layout, and loose clamps must be tightened in time.
Third, the noise of single column hydraulic press hydraulic cylinder
(1) Single column hydraulic press oil is mixed with air or the air in the hydraulic cylinder is not completely exhausted, causing cavitation under high pressure and causing loud noise. At this time, the air must be exhausted in time.
(2) If the cylinder head oil seal is too tight or the piston rod is bent, noise will also be generated due to abnormal force during movement. At this time, the oil seal must be replaced or the piston rod must be straightened in time.
Fourth, when air is mixed into the oil of a single column hydraulic press, cavitation is easily formed in the high-pressure area and propagates in the form of pressure waves, causing oil oscillation and cavitation noise in the system. The main reasons are:
(1) The oil filter and oil inlet pipe of the hydraulic pump are clogged or the oil viscosity is too high, which can cause the vacuum at the oil inlet of the pump to be too high, allowing air to penetrate.
(2) The oil seal at the shaft end of the hydraulic pump and pilot pump is damaged, or the oil inlet pipe is poorly sealed, causing air to enter
(3) The oil level in the fuel tank is too low, causing the hydraulic pump inlet pipe to be emptied directly.