High-precision hydraulic station with pressure controlled by servo valve

Abstract

The utility model discloses a high-precision hydraulic station with pressure controlled by a servo valve, which belongs to the technical field of hydraulic stations and is characterized in that symmetrical supporting legs are arranged at the bottom of a hydraulic station body, the hydraulic station body is provided with an oil tank, a liquid level thermometer is arranged on the surface of the oil tank, and an oil pump is arranged in the oil tank; a motor, a valve block, an air cooling cooler and a filter are fixedly installed on the top of the hydraulic station body, a high-frequency response servo valve, a hydraulic valve, a high-pressure oil filter and a pressure sensor are fixedly installed on the surface of the valve block, the feeding end of the filter is fixedly sleeved with a connecting pipe, a cavity is formed in the side wall of the oil tank, and a heat insulation plate and a sound insulation plate are fixedly installed in the cavity. According to the hydraulic station for controlling the pressure through the high-precision servo valve, the high-frequency response servo valve and the pressure sensor are adopted for closed-loop control, high-precision proportional control over the pressure of the hydraulic station is achieved, and the problems that the control pressure fluctuation of a proportional overflow valve is large, and tiny pressure is not easy to control are solved through the pressure of the hydraulic station.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic stations, and more specifically, to a hydraulic station for controlling pressure by a high-precision servo valve. Background Technique

[0002] A hydraulic station is a hydraulic source device composed of a hydraulic pump, a driving electric motor, an oil tank, a directional valve, a throttle valve, a relief valve, etc., or a hydraulic device including a control valve, which supplies oil with the required flow direction, pressure and flow rate for the driving device, and is applicable to various machines where the hydraulic station is separated from the driving device. Connecting the hydraulic station and the driving device (cylinder or motor) with oil pipes, various specified actions can be realized in the hydraulic system.

[0003] The safety relief valve plays a safety protection role in the system. When the system pressure exceeds the specified value, the safety valve opens, discharging a part of the gas in the system into the atmosphere, so that the system pressure does not exceed the allowable value, thereby ensuring that the system does not have an accident due to excessive pressure.

[0004] Currently, most traditional hydraulic stations control pressure through a proportional relief valve. This method makes the control pressure of the hydraulic station fluctuate greatly during actual use, and small pressures cannot be accurately controlled, bringing certain inconveniences to actual use. Therefore, we designed a hydraulic station for controlling pressure by a high-precision servo valve. By adopting a closed-loop control of a high-frequency response servo valve and a pressure sensor, high-precision proportional control of the hydraulic station pressure is realized to solve the above problems. Content of the Utility Model

[0005] Aiming at the problems existing in the prior art, the purpose of the utility model is to provide a hydraulic station for controlling pressure by a high-precision servo valve. This hydraulic station for controlling pressure by a high-precision servo valve adopts a closed-loop control of a high-frequency response servo valve and a pressure sensor to realize high-precision proportional control of the hydraulic station pressure, so that the pressure of the hydraulic station overcomes the problems of large pressure fluctuation and difficult control of small pressure in the proportional relief valve control.

[0006] To solve the above problems, the utility model adopts the following technical solutions.

[0007] A hydraulic station for controlling pressure with a high-precision servo valve, including a hydraulic station body. Symmetrical support feet are provided at the bottom of the hydraulic station body. The hydraulic station body is provided with an oil tank. A liquid level thermometer is arranged on the surface of the oil tank. An oil pump is arranged inside the oil tank. A motor, a valve block, an air-cooled cooler and a filter are fixedly installed on the top of the hydraulic station body. A high-frequency response servo valve, a hydraulic valve, a high-pressure oil filter and a pressure sensor are fixedly installed on the surface of the valve block. The feed end of the filter is fixedly sleeved with a connecting pipe. A cavity is arranged inside the side wall of the oil tank. A heat insulation board and a sound insulation board are fixedly installed inside the cavity. This hydraulic station for controlling pressure with a high-precision servo valve adopts a closed-loop control of a high-frequency response servo valve and a pressure sensor to achieve a high-precision proportional control of the hydraulic station pressure, overcoming the problems of large pressure fluctuations and difficult control of small pressures in the proportional relief valve control.

[0008] Further, the surfaces of the heat insulation board and the sound insulation board are in contact and extrusion. The heat insulation board is made of a polymer heat insulation material. The sound insulation board is made of a sound insulation plate material, and sound absorption holes and sound absorption cotton are provided on the surface, which can prevent external heat from entering the interior of the hydraulic station and at the same time prevent the working noise inside the hydraulic station from spreading out.

[0009] Further, a maintenance port is provided on the side of the oil tank. Threaded holes are provided on the end face of the maintenance port, and a cover plate is fastened by screws. A sealing gasket is provided on the extrusion surface between the cover plate and the maintenance port. The maintenance port facilitates users to enter and exit the interior of the hydraulic station for maintenance work.

[0010] Further, an air-cooling component is arranged inside the air-cooled cooler. The blowing end of the air-cooling component arranged in the air-cooled cooler is communicated with a cooling pipeline, which is convenient for cooling the hydraulic station.

[0011] Further, a filter chamber is arranged inside the filter. A filter element is arranged inside the filter chamber. The filter chamber is provided with a detachable sealing plate, which is convenient for the later replacement of the filter element.

[0012] Further, symmetrical hanging plates are provided on the side of the oil tank. Hanging holes are provided on the side of the hanging plates, which is convenient for hoisting the hydraulic station.

[0013] Further, the connecting pipe is made of a high-pressure hose, which is convenient for the connection and arrangement of the pipeline.

[0014] Compared with the prior art, the advantages of the present utility model are as follows:

[0015] (1) This scheme adopts a closed-loop control of a high-frequency response servo valve and a pressure sensor to achieve a high-precision proportional control of the hydraulic station pressure, overcoming the problems of large pressure fluctuations and difficult control of small pressures in the proportional relief valve control. Description of the Drawings

[0016] Figure 1 Schematic diagram of the overall structure of the present utility model;

[0017] Figure 2 Top view of the overall structure of the present utility model;

[0018] Figure 3 Stereogram of the fuel tank structure of the present utility model;

[0019] Figure 4 Working principle diagram of the present utility model.

[0020] Description of the reference numerals in the figure:

[0021] 1 Hydraulic station body, 11 Fuel tank, 12 Support feet, 13 Cavity, 14 Heat insulation board, 15 Sound insulation board, 16 Maintenance opening, 17 Cover plate, 18 Hanging plate, 19 Liquid level thermometer, 2 Motor, 3 High-frequency response servo valve, 4 Hydraulic valve, 5 High-pressure oil filter, 6 Air-cooled cooler, 7 Filter, 71 Connecting pipe, 8 Valve block, 81 Pressure sensor, 9 Oil pump. Specific implementation manner

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] Embodiment 1

[0024] Please refer to Figures 1-4, a hydraulic station for controlling pressure with a high-precision servo valve, comprising a hydraulic station body 1. Symmetrical support feet 12 are provided at the bottom of the hydraulic station body 1. Bolt holes are provided at the bottom of the support feet 12, facilitating the fastening of the hydraulic station to the connecting object through bolts to ensure the installation stability and firmness of the hydraulic station. The hydraulic station body 1 is provided with an oil tank 11. The oil tank 11 is made of metal material, and an anti-corrosion coating, a heat-insulating coating and a wear-resistant coating are provided on the outer surface. A liquid level thermometer 19 is provided on the surface of the oil tank 11. An oil pump 9 is provided inside the oil tank 11. A motor 2, a valve block 8, an air-cooled cooler 6 and a filter 7 are fixedly installed on the top of the oil tank 11. The motor 2 belongs to the prior art and is used for the operation of the hydraulic station. Its composition structure and working principle are well-known to those skilled in the art and will not be described in detail here. The high-frequency response servo valve 3, the high-pressure oil filter 5 and the pressure sensor 81 are used in combination to achieve closed-loop control. The high-pressure oil filter 5 is provided with a spool valve sleeve structure and is equipped with a position feedback device. Its composition structure and working principle are well-known to those skilled in the art and will not be described in detail here. A filter chamber is provided inside the filter 7, and a filter element is provided inside the filter chamber. The filter chamber is provided with a detachable sealing plate, facilitating the later replacement of the filter element. The high-frequency response servo valve 3, the hydraulic valve 4, the high-pressure oil filter 5 and the pressure sensor 81 are fixedly installed on the surface of the valve block 8. The hydraulic valve 4 belongs to the prior art and is one of the components of the hydraulic station. Its composition structure and working principle are well-known to those skilled in the art. An air-cooling component is provided inside the air-cooled cooler 6. The blowing end of the air-cooling component provided in the air-cooled cooler 6 is communicated with a cooling pipeline, facilitating the cooling of the internal components during the operation of the hydraulic station and avoiding the damage of the hydraulic station components due to high temperature during the operation. The feeding end of the filter 7 is fixedly sleeved with a connecting pipe 71. The connecting pipe 71 is made of a high-pressure hose, which facilitates the connection and arrangement of the pipelines. One end of the connecting pipe 71 is fixedly sleeved with the feeding end of the filter 7. A cavity 13 is provided inside the side wall of the oil tank 11, and a heat-insulating plate 14 and a sound-insulating plate 15 are fixedly installed inside the cavity 13.

[0025] An inspection opening 16 is provided on the side of the oil tank 11. Threaded holes are provided on the end face of the inspection opening 16, and a cover plate 17 is fastened by screws. A sealing gasket is provided on the extrusion surface between the cover plate 17 and the inspection opening 16, which can prevent dust and impurities from entering through the connection gap and at the same time prevent noise from passing out through the connection gap. The inspection opening 16 facilitates the user to enter the inside of the hydraulic station for maintenance work. Symmetrical hanging plates 18 are provided on the side of the oil tank 11. Hanging holes are provided on the side of the hanging plates 18, facilitating the hoisting of the hydraulic station.

[0026] The surfaces of the heat insulation plate 14 and the sound insulation plate 15 are in contact and extruded. The heat insulation plate 14 is made of a polymer heat insulation material, and the sound insulation plate 15 is made of a sound insulation plate, and the surface is provided with sound absorption holes and sound absorption cotton, which can prevent external heat from entering the inside of the hydraulic station, and at the same time prevent the working noise inside the hydraulic station from spreading out, enabling the hydraulic station to have the function of noise elimination and reduction, and at the same time reducing the energy consumption of cooling inside the hydraulic station, having the function of energy saving.

[0027] When the hydraulic station controlled by the high-precision servo valve for pressure works, a closed-loop control is adopted between the high-frequency response servo valve 3 and the pressure sensor 81 to achieve high-precision proportional control of the hydraulic station pressure, overcoming the problems of large pressure fluctuation and difficult control of small pressure in the proportional overflow valve control. At the same time, during the operation of the hydraulic station in hot weather, the high temperature outside the hydraulic station is isolated by the heat insulation plate 14, thus preventing the high temperature outside the hydraulic station from entering the inside and increasing the working temperature of the hydraulic station components, which may cause the components to have a shortened service life and be damaged. At the same time, the working energy consumption of the air-cooled cooler is reduced, having the function of energy saving. And during the operation of the hydraulic station, the noise generated by the internal components is reduced by the sound insulation plate 15 and the sound absorption cotton provided on the sound insulation plate 15, which can prevent the noise from spreading out, thereby causing noise pollution in the working environment, and can prevent the staff from suffering hearing damage due to long-term exposure to the noisy working environment.

[0028] The above is only the preferred specific embodiment of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A hydraulic station for controlling pressure with a high-precision servo valve, comprising a hydraulic station body (1), wherein the bottom of the hydraulic station body (1) is provided with symmetrical supporting feet (12), characterized in that: The hydraulic station body (1) is provided with an oil tank (11), the surface of the oil tank (11) is provided with a liquid level thermometer (19), the interior of the oil tank (11) is provided with an oil pump (9), the top of the hydraulic station body (1) is fixedly installed with a motor (2), a valve block (8), an air-cooled cooler (6) and a filter (7), the surface of the valve block (8) is fixedly installed with a high-frequency response servo valve (3), a hydraulic valve (4), a high-pressure oil filter (5) and a pressure sensor (81), the feed end of the filter (7) is fixedly sleeved with a connecting pipe (71), the side wall of the oil tank (11) is provided with a cavity (13), the interior of the cavity (13) is fixedly installed with a heat insulation board (14) and a sound insulation board (15).

2. A high-precision servo valve pressure control hydraulic station according to claim 1, characterized in that: The surfaces of the heat insulation board (14) and the sound insulation board (15) are in contact and extrusion, the heat insulation board (14) is made of a polymer heat insulation material, and the sound insulation board (15) is made of a sound insulation board, and sound absorption holes and sound absorption cotton are provided on the surface.

3. A high-precision servo valve pressure control hydraulic station according to claim 1, characterized in that: The side of the oil tank (11) is provided with an inspection port (16), the end face of the inspection port (16) is provided with a threaded hole, and a cover plate (17) is fastened with screws, and a sealing gasket is provided on the extrusion surface of the cover plate (17) and the inspection port (16).

4. A high-precision servo valve pressure control hydraulic station according to claim 1, characterized in that: An air-cooling component is arranged inside the air-cooling cooler (6), and an air-blowing end of the air-cooling component arranged in the air-cooling cooler (6) is connected to a cooling pipeline.

5. A high-precision servo valve pressure control hydraulic station according to claim 1, characterized in that: The filter (7) is provided with a filter chamber inside, a filter element is provided inside the filter chamber, and a detachable sealing plate is provided in the filter chamber.

6. A hydraulic station with high-precision servo valve controlling pressure according to claim 1, characterized in that: A symmetrical hanging plate (18) is provided on the side of the oil tank (11), and a hanging hole is provided on the side of the hanging plate (18).

7. A high-precision servo valve pressure control hydraulic station according to claim 1, characterized in that: The connecting pipe (71) is made of a high-pressure hose.

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