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Common faults and elimination of hydraulic gear pump

by:WORLD     2022-09-02
According to the structure, hydraulic presses can be divided into four-column hydraulic presses, single-column hydraulic presses (bow hydraulic presses, C-type hydraulic presses), rotary hydraulic presses, and desktop hydraulic presses. According to the use can be divided into

Metal forming machine, hardware forming machine, protective film cutting machine, leather embossing machine, stamping and forming machine for electronic components, plastic trimming machine, etc. The use of hydraulic presses is so extensive,

How to solve the problem of gear pump during use? The following is a hydraulic press manufacturer Jushengwang's Shanghai WORLD Press Machine to help you analyze the common faults and troubleshooting methods of hydraulic presses:

1. Insufficient oil delivery.

Reason analysis: First, the oil suction pipe or oil filter is blocked, second, the oil viscosity is too large, third, the pump speed is too high, fourth, the end face clearance or circumferential clearance is too large, and fifth, the relief valve

malfunction. The key problems of these five problems are poor oil absorption, serious leakage and bypass oil return.

Solution: The oil filter should be cleaned frequently, and the oil-passing capacity should be twice the pump flow. Oil viscosity, pump speed, oil suction height, etc. should be selected according to the regulations, and should be checked in addition

The matching clearance of the pump, and overhaul the relief valve and other components.

2, the pressure is not high.

Reason analysis: First, the end face clearance or circumferential clearance is too large, the overflow valve fails or the oil supply is insufficient. The key problem is serious leakage and insufficient flow.

Solution: Check the pump to make the oil delivery volume and matching clearance meet the specified requirements, check the relief valve and other components, and eliminate the leakage link.

3. Overheating.

Reason analysis: the viscosity of the oil pump is too high or too low, the friction between the gears and side plates and other relative moving parts is serious, the volume of the mailbox is too small, and the heat dissipation conditions of the pump are poor.

Key problem: The energy loss of the parts and oil in the pump is too large due to friction, agitation and leakage, and the heat dissipation performance is poor.

Solution: Replace the hydraulic oil with suitable viscosity, repair the relevant parts, reduce the mechanical friction loss, and improve the heat dissipation conditions of the pump and the mailbox.

4. The pump does not pump oil

Reason analysis: the pump is not turning right, the oil level is too low, and the oil filter is blocked.

The key reason: When the sealing working volume of the pump changes from small to large, oil must be sucked through the oil tank, and oil must be discharged from large to small.

Solution: The steering of the motor driving the pump should meet the requirements to ensure that the oil suction pipe can enter the oil.

5. Main wear parts

Reason analysis: tooth top and both sides, the suction chamber side of the pump inner wall, the end face of the side cover, the contact between the pump shaft and the needle roller.

The key reason: The parts in the pump receive an unbalanced radial force, and the verticality between the shaft hole and the end face is poor.

Solution: reduce the unbalanced radial force, improve the manufacturing accuracy of the pump, and control the end face clearance within 0.02-0.05MM.

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