The necessary condition is that the pump chamber has a sealed volume change.
Made of aluminum alloy, high strength, corrosion resistance, lightweight, suitable for operation in various environments.
The double-speed feature reduces the number of presses, and the low-pressure room is quickly in the state of load and work, and it is immediately converted to high pressure, shortening each operation cycle.
Equipped with a pressure regulating valve, which can adjust the control and set the working pressure.
Working PrincipleIt is a hydraulic component that provides pressurized liquid for hydraulic transmission and is a type of pump. Its function is to convert the mechanical energy of the power machine (such as an electric motor and internal combustion engine, etc.) into the pressure energy of the liquid. The figure shows the working principle of a single plunger pump. The cam is rotated by an electric motor. When the cam pushes the plunger to move upward, the sealing volume formed by the plunger and the cylinder decreases, and the oil is squeezed out from the sealing volume and discharged to the required place through the one-way valve. When the cam rotates to the descending part of the curve, the spring forces the plunger downward to form a certain degree of vacuum, and the oil in the oil tank enters the sealed volume under the action of atmospheric pressure. The cam makes the plunger rise and fall continuously, the sealing volume decreases and increases periodically, and the pump continuously absorbs and discharges oil.
Performance ParametersThe hydraulic pump is the power component of the hydraulic system. Its function is to provide pressure oil to the hydraulic system. From the perspective of energy conversion, it will convert the mechanical energy output by the prime mover (such as an engine) into the pressure energy of the liquid that is easy to transport. The hydraulic motor is an actuator, which can convert the pressure energy of the input liquid into the mechanical energy of the output shaft rotation, which is used to drag the load to do work. According to the structural form, hydraulic pumps and hydraulic motors can be divided into gear type, vane type, plunger type, and other types.
1. Hydraulic pump pressure
The working pressure of the hydraulic pump refers to the pressure of the oil output (or input) of the pump (or motor) during actual work, which is determined by the external load.
Rated pressure refers to the highest pressure that can operate continuously according to the test standard under normal working conditions. Its size is limited by the service life. If the rated pressure is exceeded, the service life of the pump (or motor) will be shorter than the designed service life. When the working pressure is greater than the rated pressure, it is called overloading.
2. Speed
Working speed refers to the actual rotation speed of the pump (or motor) when it is working.
The rated speed refers to the highest speed that can operate normally for a long time under the rated pressure. If the pump exceeds the rated speed, it will cause insufficient oil absorption, vibration, and loud noise, the parts will be damaged by cavitation and the service life will be reduced.
The minimum stable speed refers to the minimum speed allowed for the normal operation of the motor. At this speed, the motor does not crawl.
3. Displacement, flow
The displacement refers to the volume of the discharged (or input) liquid obtained by the change of the geometric size of the sealed cavity per revolution of the pump (or motor), and the common unit is ml/r (milliliters/revolution). The displacement can be changed by adjustment to become a variable pump (or variable motor), and the displacement can not be changed to become a quantitative pump (or quantitative motor).
The actual flow refers to the flow at the outlet (or inlet) when the pump (or motor) is working. Due to the internal leakage of the pump itself, its actual flow is less than the theoretical flow. Since the motor itself also has internal leakage, in order to achieve the specified speed, in order to compensate for the leakage, the actual input flow must be greater than the theoretical flow.
4. Efficiency
Volumetric efficiency, for a hydraulic pump, refers to the ratio of its actual flow to the theoretical flow. For hydraulic motors, it refers to the ratio of the theoretical flow to the actual flow.
Mechanical efficiency, for a hydraulic pump, refers to the ratio of its theoretical torque to the actual input torque. The actual output torque of the hydraulic motor is the torque after the theoretical torque overcomes the friction force, so its mechanical efficiency is the ratio of the actual output torque to the theoretical torque.
Overall efficiency refers to the ratio of the output power of the pump (or motor) to the input power. The total efficiency is equal to the product of the volumetric efficiency and the mechanical efficiency.
Repair and Maintenance
Causes of failure: (1) The oil level of the hydraulic oil tank is too low;
Remedy: add hydraulic oil
Cause of failure: (2) Hydraulic oil is not used according to the season;
Troubleshooting method: 46# hydraulic oil (or 68#) is usually used without special replacement, and 32# is considered to be used in winter when the north is extremely cold
Cause of failure: (3) The oil inlet pipe is seriously blocked by dirt;
Exclusion method: remove the foreign body from the tube
Cause of failure: (4) The oil seal of the driving gear of the oil pump is damaged, and air enters the hydraulic system;
Remedy: Replace the aged or damaged oil seals and O-rings
Causes of failure: (5) The oil pump inlet and outlet joints or the "O" ring of the elbow joint are damaged, the fastening bolts of the elbow joint or the nuts of the oil inlet and outlet pipes are not tightened, and air enters the hydraulic system;
Remedy: Replace the O-ring, tighten the bolts or nuts at the joint
Cause of failure: (6) Internal leakage of the oil pump and aging of the sealing ring;
Remedy: Replace the sealing ring
Cause of failure: (7) The end face of the oil pump or the end face of the main and driven gear bushings is worn or scratched, and the unevenness of the end faces of the two bushings is out of tolerance;
Troubleshooting method: replace the worn gear oil pump or oil pump shaft sleeve, and grind the end face on the flat plate when the wear is slight. The allowable error of its unevenness is 0.03mm; the end surface of the upper shaft sleeve is lower than the pump body, the upper plane (normal value is lower than 2.5~2.6mm), if the tolerance is too high, 0.1~0.2mm copper sheet should be added to the lower shaft sleeve to compensate. Then it should be installed on the rear axle sleeve
Cause of failure: (8) Internal leakage caused by incorrect assembly of internal parts of the oil pump;
Remedy: The unloading piece and the sealing ring must be installed into the oil chamber so that the two shaft sleeves can maintain balance. The elastic force of the guide wire should be able to twist the upper and lower bushings towards the direction of rotation of the driven gear by a small angle at the same time so that the processing planes of the two bushings of the main and driven gears can be closely attached; the unloading groove on the bushing must be installed with a low-pressure chamber side, to eliminate the harmful dead volume when the gears mesh; before pressing into the self-tightening oil seal, the surface should be coated with a layer of lubricating oil, and attention should also be paid to the oil blocking edge facing the front cover, not reversed; before installing the pump cover, be sure to Pour a small amount of hydraulic oil into the pump casing and turn the meshing gear by hand
Cause of failure: (9) "Left-handed" oil pump installed with "right-handed" oil pump, causing damage to the skeleton oil seal;
Remedy: "Right-handed" pumps cannot be installed on "left-handed" machines, otherwise the frame oil seal will be damaged;
Cause of failure: (10) The hydraulic oil is too dirty.
Remedy: Clean the system and replace the hydraulic oil.
Cause of failure: (11) The filter of the pump is blocked by dirt and cannot filter oil
Remedy: Use clean cleaning oil to remove dirt from the filter.
Cause of failure: (12) The oil level is insufficient, the oil suction position is too high, and the oil suction pipe is exposed to the oil surface:
Remedy: add oil to the oil level and lower the oil suction position.
Cause of failure: (13) There is no paper pad on both sides of the pump body and the pump cover; the pump body and the pump cover are not vertically sealed:
Elimination method: Inhale air when rotating: add a paper pad between the pump body and the pump cover; grind the pump body on a flat plate with emery, so that the vertical error between the pump body and the pump cover does not exceed 0.005mm, and fasten the connection between the pump body and the pump cover, there must be no leakage.
Cause of failure: (14) The driving shaft of the pump is not concentric with the motor coupling, and there is twisting friction:
Remedy: Adjust the concentricity of the pump and motor coupling so that the error does not exceed 0.2mm.
Cause of failure: (15) The meshing accuracy of the pump gear is not enough:
Remedy: The grinding gear reaches the gear meshing accuracy.
Cause of failure: (16) The oil seal skeleton of the pump shaft falls off, and the pump body is not sealed:
Remedy: Replace the qualified pump shaft oil seal.
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