Assembly of axial piston pump

Installation of axial piston pump

(1) Before installation, all parts or components to be installed shall be checked again and recorded.

(2) Deburring all parts, especially the sharp corner.

(3) All parts should be carefully cleaned before installation to prevent impurities, dust, dirt, etc. from mixing into the outer surface of each cooperation room in the pump, so as to avoid scratching the smooth appearance of each cooperation part.

(4) When installing, the force ring should be struck. If it is necessary to strike, the hammer should not be used to hit the parts directly. Instead, it should be padded by the central object (such as copper rod).

(5) During installation, the steel ball of centering tension spring should be prevented from falling off. The steel ball can be coated with cleaning grease to make the steel ball stick to the inner sleeve of tension spring or return plate before installation. Otherwise, if the steel ball falls into the pump during installation, other parts in the pump will be damaged during the operation, so that the pump can not be repaired again. Pay attention to this.

Part of the pump port surface figure (6) there is a pin on the connecting surface between the pump body and the port plate, which should not be pulled out under normal circumstances. If the end face of the valve plate is pulled out due to grinding, attention should be paid to the accurate orientation of the locating pin to the pin hole on the pump body during re installation. If it is installed incorrectly, it will not be able to absorb oil normally. As shown in figure x, if the hydraulic pump works normally (according to direction a), it is necessary to install the positioning pin in hole 1; if the hydraulic pump works in reverse direction (according to direction B), it is necessary to install the locating pin in hole 2; if the hydraulic pump is required to be used as a hydraulic motor, the locating pin is necessary to be installed in hole 3 regardless of forward rotation or rotation.

(7) After the variable head is installed, it should be adjusted within 0 ° to 21 ° and the final setting angle of variable head should be 20 ° 30 ′ and a layer of clean machine oil should be coated on the surface whose surface roughness meets the requirements.

(8) When tightening the screw, the screw should be inserted symmetrically and evenly under force, and the pump shaft should be rolled by hand at the same time to ensure that the rolling is sensitive and stable, and there is no difference between the weight and weight.

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Mechanical vibration in the plunger pump

The plunger pump is composed of many parts, due to the manufacturing error of parts, improper assembly will likely cause vibration and noise of the hydraulic system

Vibration and noise of hydraulic valves hydraulic valve attack noise, due to the variety of valves, application conditions and other detailed conditions are different. According to the cause of its attack can be roughly divided into mechanical sound and fluid sound two categories.

1) the mechanical noise

The large part of the hydraulic valve by the spool, valve body, control parts, fasteners, seals, and so on, he is the process of external force to make the spool movement, spool movement to the corresponding position to change the flow attack, to meet the work of beg. In this process temporary, the valve within the mechanical contact of movable parts attack noise.

2) fluid

Due to the hydraulic valve in the end of austerity, reversing, overflow, so that the flow of liquid in the valve body, direction and back pressure attack of all kinds of innovation, resulting in valve parts and pipe wall vibration, thereby attack noise. According to the cause of the burst pressure vibration, it can be divided into cavitation sound, motion sound, hydraulic impact sound and shock sound. Pipeline vibration and noise this main assumption due to pump, valve and other hydraulic components vibration in the pipeline caused by interaction. Research shows that when the length of the pipeline is exactly equal to half the vibration pressure wavelength integer times, the pipeline will burst into violent high-frequency noise.

In addition, the external source may also cause pipe resonance; When the cross - section of a line dies (expands and cuts sharply, or turns sharply), dui makes its fluid flow innovate, making it turbulent and noisy.

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The structure and characteristics of centrifugal pump

Centrifugal pump is a kind of pump that USES the centrifugal action generated when the PR wheel rotates at high speed to change the mechanical energy into the kinetic energy and the pressure energy of water to raise water. It is divided by the number of impeller into a single stage pump (only one impeller) and multistage pump (more than two impeller) : according to the impeller inlet way and divided into single suction pump and double suction pump: single suction pump is a single eagle impeller inlet. Its head height, simple structure, reliable work, but the meteor is small, suitable for mobile drainage and irrigation; The double-suction centrifugal pump takes water from the two sides of the impeller with a flow twice as much as the single-suction pump, but its structure is complex, so it is suitable for the fixed farm drainage station with large flow and high head. Ordinary centrifugal pump needs to discharge the air in the pump shell and inlet pipe before working. For small pump, it is necessary to fill the chestnut shell and inlet pipe with water. For large mercury pump, it is necessary to have special auxiliary equipment to pump air and divert water. Another form of centrifugal pump is self-priming centrifugal pump. At present, there are three kinds of pumps used in agriculture irrigation: single-stage single-suction centrifugal pump, single-stage double-suction centrifugal pump and small-sized self-suction centrifugal pump.

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Oil filter equippedSeveral common faults of axial piston pump and their causes analysis

Axial piston pump in the long after the work, or improper operation and maintenance, often occur fault, hengyu hydraulic for you to briefly introduce a few common axial piston pump fault and cause analysis.
1, the output flow is not enough or no oil: high suction resistance or suction air; Poor axial force; Return spring or return disk damaged; There is dirt between the plate and the cylinder; Damage to plunger or plunger hole; The variable mechanism is not in the right position; Oil temperature is too high; Poor assembly.
2. No pressure increase or no pressure increase at all: the above mentioned flow insufficiency may cause; The variable mechanism is not well adjusted; Other reasons.
3, pump noise, pressure fluctuations: inhalation of air; Variable piston motion is not flexible; Triangle groove Angle is too small; The stiffness of variable mechanism is small; Sliding boots and ball head cooperate loose; Large leakage of variable mechanism.
4, pump heating, oil temperature rise is too high: plunger and plunger hole, valve plate and cylinder joint surface wear, leakage is large; The motion pair in the pump is severely worn and pulled, and the mechanical efficiency is low. Small eccentric pump or low working pressure; Large oil viscosity, small tank volume; Bearing wear and transmission strain.
5. Serious oil leakage (internal and external leakage) in the leaking pipe: the cylinder body and the distribution plate, the plunger and the plunger hole are worn; Variable piston wear, resulting in leakage; Joint seal damaged; The oil seal leaks oil.
6, the pump can not turn: the plunger stuck; Slippery boots fall off; The ball head is broken; Return disk rupture; The cylinder body is sintered with the plate;
7. Failure of variable mechanism: The circular surface of variable head bearing bush is seriously worn; Control oil channel blockage; The variable Viseca is dead; Control spool spring damage; Variable mechanism leakage
8. The fitting surface of the distribution plate and the cylinder body is worn or burned out: the oil is dirty; No oil in the pump when starting; The distributing disc is not hard enough; The cylinder body is of poor quality; High temperature and high pressure deformation of distribution plate; The coaxiality difference between the supporting hole in the pump shell and the transmission shaft; The fit clearance between cylinder block and bearing is too large; Transmission shaft spline mating clearance is too small; The distribution surface of the cylinder block is not perpendicular to the rotation center; Drive shaft bending; Oil trapped in the transition zone between high and low pressure of the distribution plate is serious.
9. Wear or burn out of slipper and swash plate fitting surface: oil pollution; Piston or slipper damping hole plug; Swash plate hardness or machining accuracy is not enough; The slipper shoulder thickness is not consistent; The static bearing precision of slipper surface is not enough; Plunger ball head plane is small

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