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The hydraulic system is used because the hydraulic system has the characteristics of wide application, high efficiency and simple structure in power transmission. The main task of a hydraulic system is to transform power from one form to another.

Is it true that the hydraulic station commonly used in industrial equipment is equivalent to the hea

1. Components of hydraulic pump:

The hydraulic station is a hydraulic device composed of a hydraulic pump, a driving motor, an oil tank, a directional valve, a throttle valve, an overflow valve, etc. or a hydraulic device including a control valve. Supply oil according to the flow direction, pressure and flow required by the driving device. It is suitable for various machinery where the driving device and the hydraulic station are separated. The hydraulic station and the driving device (cylinder or motor) are connected with oil pipes, and the hydraulic system can achieve various regulations. Actions.

In particular, the directional valve, throttle valve, and overflow valve seem to be small, but they have a great effect. When buying, you must choose high-quality brand products, so that they can be used smoothly, fast in time, and greatly improve work efficiency.

2.working principle

The hydraulic station is also known as the hydraulic pump station. The motor drives the oil pump to rotate. The pump draws oil from the oil tank and converts the mechanical energy into the pressure energy of the hydraulic oil. The hydraulic oil is realized by the hydraulic valve through the manifold block (or valve combination). After the flow rate is adjusted, it is transmitted to the oil cylinder or oil motor of the hydraulic machinery through an external pipeline, thereby controlling the direction change of the hydraulic motor, the strength and the speed of the speed, and pushing various hydraulic machinery to do work.

The hydraulic station is an independent hydraulic device. It supplies oil according to the requirements of the driving device (host) and controls the direction, pressure and flow of the oil flow. It is suitable for various hydraulic machinery where the host and the hydraulic device are separable, and the motor drives the oil pump. When rotating, the pump sucks oil from the oil tank and then pumps oil, converting mechanical energy into pressure energy of hydraulic oil.

After purchase, as long as the hydraulic station is connected with the actuator (oil cylinder and oil motor) on the main engine with oil pipes, the hydraulic machine can realize various prescribed actions and working cycles.


The structure of the hydraulic station is mainly distinguished by the structure of the pump device, the installation position and the cooling method. One is the top placement test, the other is the horizontal placement.

Structural installation

According to the mechanism and installation position of the pump device, it can be divided into:

1) Top-mounted vertical type: The pump device is installed vertically on the fuel tank cover and is mainly used for quantitative pump systems.

2) Top-mounted horizontal type: The pump device is installed horizontally on the fuel tank cover, and is mainly used for variable pump systems to facilitate flow adjustment.

3) Side-mounted type: The pump device is horizontally installed on a separate foundation next to the fuel tank. The side-mounted type can be equipped with a backup pump. It is mainly used for systems with a large fuel tank capacity of 250 liters and a motor power of more than 7.5 kilowatts.

cooling method

1) Natural cooling: Cooling by heat exchange between the fuel tank itself and the air, generally used in systems with a fuel tank capacity of less than 250 liters.

2) Forced cooling: A cooler is used for forced cooling, which is generally used for systems with a tank capacity greater than 250 liters. The hydraulic station takes the effective oil storage measurement of the oil tank and the motor power as the main technical parameters. There are 18 specifications of fuel tank capacity (unit: liter/L): 25, 40, 63, 100, 160, 250, 400, 630, 800, 1000, 1250, 1600, 2000, 2500, 3200, 4000, 5000, 6000 sets According to user requirements and operating conditions, the series hydraulic station can achieve: ①Configure integrated blocks according to the system, or without integrated blocks; ②Can be equipped with coolers, heaters, and accumulators; ③Can be equipped with electrical control devices, It is also possible to have no electrical control device.

Oil tank form

1) Ordinary steel plate: The box body is welded with 5MM-6MM steel plate, and the panel is made of 10-12MM steel plate. If there are too many holes, it can be thickened or reinforced.

2) Stainless steel plate: the box body is made of 304 stainless steel plate with a thickness of 2-3MM, the panel is made of 304 stainless steel plate with a thickness of 3-5MM, and the load-bearing part is increased with stiffeners.

3) It is difficult to realize the anti-rust treatment inside the ordinary steel plate fuel tank. The rust entering the oil circulation system will cause many failures. The fuel tank with all-stainless steel design solves this industry problem.

structure type

1) Piston type

The single piston rod hydraulic cylinder has a piston rod at only one end. As shown in the figure is a single-piston hydraulic cylinder. Both the inlet and outlet ports A and B at both ends can pass pressure oil or return oil to achieve two-way movement, so it is called a double-acting cylinder.

2) Plunger type

①The plunger hydraulic cylinder is a single-acting hydraulic cylinder, which can only achieve one direction of movement by hydraulic pressure, and the return stroke of the plunger depends on other external forces or the weight of the plunger;

②The plunger is only supported by the cylinder liner without contacting the cylinder liner, so that the cylinder liner is very easy to process, so it is suitable for long-stroke hydraulic cylinders;

③The plunger is always under pressure during operation, so it must have sufficient rigidity;

④The weight of the plunger is often large, and it is easy to sag due to its own weight when placed horizontally, causing unilateral wear of the seal and the guide, so its vertical use is more advantageous.

3) Telescopic

Telescopic hydraulic cylinders have two-stage or multi-stage pistons. In the telescopic hydraulic cylinder, the order of extension of the pistons is from large to small, while the order of no-load retraction is generally from small to large. The telescopic cylinder can achieve a longer stroke, while the length is shorter when retracted, and the structure is more compact. This type of hydraulic cylinder is often used in construction machinery and agricultural machinery.

4) Swing type

Swing hydraulic cylinder is an executive element that outputs torque and realizes reciprocating motion, also known as swing hydraulic motor. There are two forms of single blade and double blade. The stator block is fixed on the cylinder, and the blade and the rotor are connected together. According to the oil inlet direction, the blade will drive the rotor to swing back and forth.

4. Features of functional components:

The hydraulic station is composed of a pump device, integrated block or valve combination, oil tank, and electrical box. The functions of each component are as follows:

Pump device-equipped with a motor and an oil pump, it is the power source of the hydraulic station, which converts the mechanical energy into the power energy of the hydraulic oil.

Manifold-is a combination of hydraulic valve and channel body. It regulates the direction, pressure and flow of hydraulic oil.

Valve combination-is a plate type valve mounted on the vertical plate, the pipe behind the plate is connected, and the function is the same as that of the manifold.

The fuel tank is a semi-closed container made of steel welded steel. It is also equipped with an oil filter, an air filter, etc., which are used for oil storage, oil cooling and filtration.

Electrical box-divided into two forms: one is equipped with a terminal board with external leads; the other is equipped with a full set of control electrical appliances.


⑴Motor, gear pump-provide driving force for hydraulic system.

⑵ Electromagnetic reversing valve-control the direction of hydraulic oil flow and change the direction of movement of the oil cylinder.

⑶ Electromagnetic relief valve-prevent the entire hydraulic system from overpressure, equivalent to a safety valve, protect the safety of the oil pump and the oil circuit system and keep the pressure of the hydraulic system constant.

⑷ Pressure reducing valve-by adjusting the pressure reducing valve, different working mechanisms can meet the requirements of different working pressures, so that the pressure of the secondary oil circuit is lower than the pressure of the primary oil circuit.

⑸ Speed regulating valve-throttle and speed regulation of the oil circuit, which can change the working speed of the hydraulic cylinder of the actuator.

⑹Hydraulic oil filter——There are two oil filter ports in the hydraulic station. One is installed at the suction port of the gear pump to avoid sucking particles and other impurities in the hydraulic oil of the oil tank. The other is installed on the hydraulic oil delivery pipeline of the system to remove impurities in the hydraulic oil, and at the same time, it can also remove gums, asphaltenes, and carbonized particles produced by the chemical changes of the hydraulic oil itself. So as to prevent the valve core from jamming and the orifice clogging. The piping system is equipped with a differential pressure alarm device. When the filter element is blocked, an electrical signal will be sent out. At this time, the filter element should be cleaned or replaced.

⑺ Pressure gauge-used to display the working pressure of the hydraulic station to facilitate the operator to control the oil pressure.

⑻Air filter-installed on the fuel tank, it has three functions. One is to prevent pollutants in the air from entering the fuel tank; the other is to ventilate to prevent the pump from emptying; and the third is to double as a hydraulic oil replenishment port.

⑼ Oil level gauge-installed on the side of the oil tank to display the level of hydraulic oil.

⑽Temperature meter—Some oil tanks are equipped with a thermometer to display the temperature of the hydraulic oil.

⑾ Connecting pipelines-conveying hydraulic driving force, mostly steel pipes, but also pressure-resistant hoses.

The use of hydraulic stations on gas generators has been very common. They are used for the transmission of coal feeding mechanism and ash basin. Reasonable maintenance and maintenance should be paid attention to during use:

5. Key points for use: 1. If oil leakage in the pipeline or other abnormal phenomena is found during the work process, immediately stop the machine for maintenance.

2. In order to prolong the service life of the hydraulic oil, the oil temperature should be less than 65℃; check the quality of the hydraulic oil every three months, and replace it every six months to a year depending on the quality of the hydraulic oil.

3. It is necessary to observe the level of the oil tank oil level gauge in time, and timely replenish the hydraulic oil that meets the requirements to prevent the oil pump from being emptied.

4. Clean or replace the oil filter regularly.

5. Keep the working environment of the hydraulic station clean and tidy.

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