เครื่องเลื่อยวงเดือน Mitre Band Saw Machine TYX-330

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Description

The hydraulic pump is the power component of the hydraulic system, which is driven by the engine or motor, sucks the oil from the hydraulic oil tank, forms the pressure oil to discharge, and sends it to the actuator. According to the structure, the hydraulic pump is divided into gear pump, plunger pump, vane pump and screw pump. The following section introduces the types of hydraulic pumps and their working principles.

Type of hydraulic pump

1. Gear pump: small volume, simple structure, lax requirement on oil cleanliness, low price; but the pump shaft is seriously worn and leaked due to unbalanced force.

2. Vane pump: divided into double acting vane pump and single acting vane pump. The pump has the advantages of uniform flow, stable operation, low noise, higher working pressure and volumetric efficiency than gear pump, and more complex structure than gear pump.

3. Plunger pump: it has high volumetric efficiency, small leakage, can work under high pressure, and is mostly used in high-power hydraulic system; however, it has complex structure, high requirements for material and processing accuracy, expensive price, and high requirements for oil cleanliness.

Working principle of hydraulic pump

The pump is a kind of energy conversion device, which converts the rotating mechanical energy of the motor into the hydraulic energy output. Hydraulic pumps work by the principle of seal volume change, so they are generally called positive displacement hydraulic pumps. Figure 2-L shows the working principle of a single plunger hydraulic pump. In the figure, plunger 2 is installed in cylinder block 3 to form a seal volume a, and the plunger is always compressed on eccentric wheel 1 under the action of spring 4. A kind of

The prime mover drives the eccentric wheel 1 to rotate so that the plunger 2 moves back and forth, and the sealing volume a changes periodically. When a changes from small to large, a part of vacuum will be formed to make the oil in the oil tank enter the oil chamber a under the action of atmospheric pressure by opening the check valve 6 through the suction pipe; otherwise, when a changes from large to large, the full oil in the cavity a will open the check valve 5 and flow into the system to realize oil pressure. In this way, the hydraulic pump will convert the mechanical energy input by the prime mover into the pressure energy of the liquid. The prime mover drives the eccentric wheel to rotate continuously, and the hydraulic pump will continuously absorb and press oil.

It is a kind of hydraulic component that provides pressurized liquid for hydraulic transmission and a kind of pump. Its function is to convert the mechanical energy of power machine (such as motor and internal combustion engine) into the pressure energy of liquid. There are many factors that affect the service life of the hydraulic pump, besides the design and manufacture of the pump itself, the selection of some relevant components (such as coupling, oil filter, etc.) and the operation in the process of test run are also related. The working principle of the hydraulic pump is that the movement brings about the change of the volume of the pump cavity, so as to compress the fluid and make the fluid have the pressure energy. The necessary condition is that there is a change of sealing volume in the pump chamber.