Axial Piston Pump
An axial piston pump is a plunger pump in which the direction of reciprocation of the piston or plunger is parallel to the central axis of the cylinder. An axial piston pump operates with a volume change produced by the reciprocating motion of a plunger parallel to the drive shaft within the plunger bore. Since the plunger and the plunger hole are both round parts, high precision fit can be achieved during processing, so the volumetric efficiency is high, the operation is stable, the flow uniformity is good, the noise is low, the working pressure is high, etc., but the hydraulic oil is polluted. It is more sensitive, the structure is more complicated, and the cost is higher.
Straight shaft swash plate piston pump
Straight-axis swash plate type piston pumps are divided into two types: pressure oil supply type and self-priming oil type. Pressure-supply type hydraulic pumps mostly use a gas tank with air pressure, and the hydraulic pump itself has a charge pump to supply pressure oil to the oil pump inlet. The self-priming hydraulic pump has a strong self-priming capability and requires no external force to supply oil. The hydraulic oil tank that relies on the air pressure supply must wait for the hydraulic stain box to reach the air pressure after each start of the machine to operate the machine. If the pressure of the hydraulic oil tank is insufficient, it will cause the machine to pull off the slippery whip in the hydraulic pump, which will cause abnormal wear of the return plate and the pressure plate in the pump body.
Radial piston pump
Radial piston pumps can be divided into two categories: valve distribution and shaft distribution. The valve distribution radial piston pump has the disadvantages of high failure rate and low efficiency. The shaft-distributing radial piston pump developed in the 70s and 80s in the world overcomes the shortcomings of the valve-distributing radial piston pump. Due to the characteristics of the radial pump structure, the radial piston pump of the shaft distribution is more resistant to impact, longer life and higher control precision than the axial piston pump. The variable stroke short pump variable is realized by changing the eccentricity of the stator under the action of the variable plunger and the limit plunger, and the maximum eccentricity is set to 5-9mm (depending on the displacement), the variable stroke is very short. . And the variable mechanism is designed for high pressure operation and is controlled by a control valve. Therefore, the pump responds quickly. The radial structural design overcomes the problem of eccentric wear such as axial piston pump shoes. Its impact resistance is greatly improved.
Hydraulic piston pump
The hydraulic piston pump relies on the pneumatic oil supply tank. After each start of the machine, the machine must be operated after the hydraulic stain box reaches the air pressure. Straight-axis swash plate type piston pumps are divided into two types: self-priming oil type with pressure supply type. Pressure-supply type hydraulic pumps mostly use a gas tank with air pressure, and the hydraulic pump itself has a charge pump to supply pressure oil to the oil pump inlet. The self-priming hydraulic pump has a strong self-priming capability and requires no external force to supply oil. For self-priming piston pumps, the oil in the hydraulic tank should not be lower than the lower limit of the oil mark, and a sufficient amount of hydraulic oil should be maintained. The higher the cleanliness of the hydraulic fluid, the longer the service life of the hydraulic pump.
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