Variable plunger pump common failures

The pressure oil of the variable piston pump enters the lower chamber of the variable housing through the check valve in the pump body and the oil hole in the variable casing of the pump casing. When the pull rod moves downwards, the servo piston is pushed downward to move the servo valve. The upper valve opening is opened, and the pressure oil in the lower chamber of the variable housing enters the variable housing upper chamber through the oil-passing hole in the variable piston. Since the upper chamber area is larger than the lower chamber, the hydraulic pressure pushes the piston downward and drives the pin to change the variable head. Rotate around the center of the ball to change the tilt angle (increase) of the variable head and the plunger pump flow increases. If the rod moves upwards, the tilt angle of the variable head changes in the opposite direction, and the flow of the pump also changes. When the angle of inclination changes to zero, the head of the variable changes in the direction of the negative declination angle, the flow changes, and the pump inlet and outlet ports change. Xi'an high pressure and large flow mud pump variable piston pump common failures:
1. The hydraulic pump output flow is insufficient or does not output fluid (1) insufficient suction. The reason is that the resistance on the suction pipe is too large or the amount of oil is insufficient. If the speed of the pump is too high, the liquid level in the tank is too low, the intake pipe leaks, and the oil filter is blocked.
(2) Excessive leakage. The reason is that the clearance of the pump is too large and the seal is bad. If the oil pan is scratched by metal fragments, iron scraps, etc., the end surface leaks oil; the one-way valve sealing surface in the variable mechanism is not well-matched, and the bearing surface of the pump body and the oil pan is blisters or grinding marks. It is possible to discriminate where the pump is damaged by checking for foreign matter in the hydraulic fluid in the pump body.
(3) The inclination of the swash plate is too small and the displacement of the pump is small. This requires adjusting the piston of the variable and increasing the swash plate inclination.
2. When the neutral displacement is not zero, the swash plate angle of the variable displacement axial piston pump is called neutral, and the pump output flow should be zero. However, there is sometimes a phenomenon where the median deviation deviates from the midpoint of the adjustment mechanism, and there is still flow output at the midpoint. The reason for this is that the position of the controller is deviated, loosened or damaged and needs to be re-zeroed, tightened or replaced. This phenomenon can also be caused by the insufficient maintenance of the angle of the pump and the wear of the tilted trunnion.
3. Output flow fluctuations Output flow fluctuations are related to many factors. Variable pumps can be considered to be caused by poor control of the variable mechanism. For example, when foreign objects enter the variable mechanism, step marks, wear marks, and scars etc. are drawn on the control piston, resulting in unstable control piston movement. Due to the lack of energy in the amplifier or the damage to the parts, the damper of the control piston with springs is poor in performance, which can cause unstable control piston movement. Unsteady flow is often accompanied by pressure fluctuations. This kind of fault generally needs to disassemble the hydraulic pump, replace the damaged parts, increase the damping, increase the spring stiffness and control the pressure.

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