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Causes and elimination methods of synchronous failure of four-column hydraulic press

by:WORLD     2022-10-23
Shanghai hydraulic press manufacturers specialize in the production of small hydraulic presses, four-column hydraulic presses, 200-ton four-column hydraulic presses, 300-ton four-column hydraulic presses, 100-ton four-column hydraulic presses, 80-ton four-column hydraulic presses, 60-ton four-column hydraulic presses, and 20-ton four-column hydraulic presses.

The four-column hydraulic press supercharger can convert the input low-pressure oil into high-pressure oil and supply it to the high-pressure branch in the transmission system, and is often used in conjunction with a low-pressure large-flow hydraulic pump. The four-column hydraulic press supercharger is composed of two pressure cylinders with diameters D1 and D2 and two pistons or plungers of different diameters fixed on the same piston rod. Boosters are commonly used to obtain high or ultra-high pressure fluids in place of expensive high-pressure or ultra-high-pressure pumps.












When the four-column hydraulic press system needs to be unloaded, attention should be paid to the difference between the unloading relief valve and the externally controlled sequence valve. The unloading relief valve is mainly used in the hydraulic circuit equipped with the accumulator. If a general external control sequence valve is used, the outlet pressure of the hydraulic pump will be high and low, and the system will not work properly. Compared with other hydraulic valves, the leakage of pilot-operated pressure reducing valves is larger, and as long as the valve is in working state, the leakage always exists, which should be fully paid attention to when selecting the capacity of the hydraulic pump. At the same time, attention should also be paid to the minimum adjustment pressure of the pressure reducing valve to ensure that the pressure difference between its inlet and outlet is 0.3-1Mpa.












Causes and elimination methods of synchronous failure of four-column hydraulic press

1. The spool of the diverter valve is radially stuck due to poor geometric accuracy or burr tension. At this time, the valve core should be repaired, the burrs should be removed, and the flexibility of the valve core should be ensured during the feedback movement.



2. Because the matching gap between the valve core and the valve body hole is too small, when the oil in the four-column hydraulic press system is polluted or the oil temperature is too high, the valve core is also prone to radial jamming. Therefore, attention should be paid to the cleanliness of the oil and the temperature of the pumped liquid during use to ensure the flexibility of the valve core movement.



3. Due to the poor installation of the hydraulic cylinder (or hydraulic motor), or due to other reasons, the movement of the cylinder is inflexible, resulting in synchronization failure. At this time, the installation position of the hydraulic cylinder needs to be corrected.



4. The pressure of the four-column hydraulic press system is too low, and the pressure does not rise, resulting in failure of the same advance. Because if the pressure drop of the primary orifice is lower than 0.6~o.8MPa, the diverter valve will not work, so the system pressure (the pressure flowing into the diverter valve) must be at least greater than this pressure value, Otherwise the diverter valve will not work.

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