High-efficiency hydraulic energy-saving system based on a servo-motor-driven hydraulic station

Abstract

The present invention relates to the technical field of hydraulic stations, and particularly to an efficient hydraulic energy-saving system based on a servo motor-driven hydraulic station. Its technical solution includes: a hydraulic oil tank and a servo motor, and the hydraulic oil tank and the servo motor are fixed through a one-way limiting component for realizing one-way vibration amplification; the one-way limiting component includes a bottom plate fixed to the hydraulic oil tank, four fixed columns are fixed on the upper side of the bottom plate, the upper end of each fixed column is fixed with a top plate, two moving plates are jointly movably sleeved on the two fixed columns on the same side, the two moving plates are jointly fixed to the servo motor, and a first spring and a second spring are sleeved on each fixed column and are respectively located on both sides of the moving plate. The present invention can automatically change the heat dissipation with different efficiencies provided to the return oil according to the different increases in the return oil temperature of the hydraulic station, and avoids the problem of dust accumulation on the surface area of the return oil pipe in the traditional heat dissipation method, realizes high-efficiency heat dissipation, and does not require an external power supply, improving the energy-saving effect.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic stations, and particularly to an efficient hydraulic energy-saving system for a hydraulic station driven by a servo motor. Background Art

[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, an overflow valve, etc. or a hydraulic device including a control valve. It supplies oil according to the flow direction, pressure, and flow rate required by the driving device, and is applicable to various machines where the driving device is separated from the hydraulic station. Connect the hydraulic station and the driving device (cylinder or motor) with a pipeline, and the hydraulic system can achieve various specified actions. Among them, the electric motor is driven by a servo motor to achieve high driving precision.

[0003] Traditional hydraulic stations are divided into continuous working types and intermittent working types. In the intermittent working type of hydraulic station, there is no need for a cooling device to cool the hydraulic oil. In the continuous working type of hydraulic station, a heat dissipation device needs to be added to cool the returned hydraulic oil to prevent the temperature of the hydraulic oil from being too high; generally, the working oil temperature should be between 25°C and 55°C. During long-term operation, the oil temperature will gradually rise and exceed the maximum suitable working temperature; too high an oil temperature will cause the oxidation of the hydraulic oil to accelerate, and thus the service life of the hydraulic oil will be greatly reduced; in traditional air-cooled heat dissipation, an external power supply is required for long-term operation, and long-term operation will cause a large amount of additional electric energy loss. A refrigeration fan is set to blow air on the pipeline for heat dissipation, resulting in dust accumulation on the side of the pipeline receiving the wind, leading to a decrease in the heat dissipation capacity of the pipeline, and it is difficult to clean the dust. Summary of the Invention

[0004] The purpose of the present invention is to address the problems in the background art and propose an efficient hydraulic energy-saving system for a servo motor-driven hydraulic station that can automatically change the heat dissipation efficiency with the change of temperature.

[0005] The technical solution of the present invention: An efficient hydraulic energy-saving system for a hydraulic station driven by a servo motor includes a hydraulic oil tank and a servo motor. The hydraulic oil tank and the servo motor are fixed through a one-way limiting component for realizing one-way vibration amplification.

[0006] The one-way limiting component includes a bottom plate fixed to the hydraulic oil tank. Four fixing columns are fixed on the upper side of the bottom plate. The upper end of each fixing column is fixed with a top plate. Two moving plates are jointly sleeved on the fixing columns on the same side. The two moving plates are jointly fixed to the servo motor. A first spring and a second spring are sleeved on each fixing column and are respectively located on both sides of the moving plate.

[0007] An oil pump connected to the hydraulic oil tank through an oil suction pipe is installed on the servo motor. The oil pump is connected to an output oil supply valve group fixed on the upper side of the hydraulic oil tank through a guide oil pipe. A return oil pipe assembly for increasing the natural heat dissipation energy efficiency in cooperation with a one-way limiting component is connected to the oil pump through a control valve;

[0008] The return oil pipe assembly includes an oil pipe one connected to the control valve. The oil pipe one is connected to an exchange box. An oil pipe two is connected to the exchange box. The oil pipe two is connected to a heat dissipation oil pipe. The other end of the heat dissipation oil pipe is connected to the hydraulic oil tank through an oil pipe three. A vertical plate is fixed on the heat dissipation oil pipe. A lower connecting plate for conducting the vibration of the servo motor through the fixed conduction heat dissipation oil pipe is fixed at the lower end of the vertical plate. A cooling component for cooling the heat dissipation oil pipe is arranged on the upper side of the hydraulic oil tank;

[0009] The cooling component includes a water tank fixed on the hydraulic oil tank. A mounting plate is fixed on one side of the water tank. The exchange box is fixed on the mounting plate. A thermoelectric generation sheet for generating electricity by utilizing the temperature difference between the exchange box and the water tank is arranged between the exchange box and the water tank. A control electric box for providing a control switch to output electric energy for the thermoelectric generation sheet is arranged on the water tank. An outer discharge pipe is communicated and connected to one side of the water tank. An adjusting component for adaptively adjusting the heat dissipation effect on the heat dissipation oil pipe through temperature difference change is arranged on the outer discharge pipe. A recycling component for recycling the liquid used for cooling the heat dissipation oil pipe is arranged on the upper side of the hydraulic oil tank.

[0010] Preferably, a centralized groove is jointly fixed on the upper sides of the two vertical plates. A plurality of water outlet holes for discharging water are arranged on the lower side of the centralized groove. The outer discharge pipe extends to the inner side of the centralized groove.

[0011] Preferably, the adjusting component includes an adjusting pipe cylinder slidably inserted into one end of the outer discharge pipe. One end of the outer discharge pipe extends into the adjusting pipe cylinder. A plurality of shunt holes are equidistantly arranged on the lower side of the adjusting pipe cylinder. A multi-fold rod is fixed on the shunt hole. A piston column is fixed at the free end of the multi-fold rod. A piston is fixed at the free end of the piston column. A thin outer cylinder is movably sleeved on the piston. One end of the piston column penetrates through the thin outer cylinder and is fixed to the piston. A liquid storage cylinder connected and fixed in the exchange box is fixed on the thin outer cylinder. An expansion liquid is arranged in the cavity formed by the piston and the liquid storage cylinder.

[0012] Preferably, the recycling component includes a filtered water box arranged on the hydraulic oil tank and below the heat dissipation oil pipe for collecting the liquid discharged from the outer discharge pipe. A filter plate is arranged on the inner bottom of the filtered water box through a support member. The filtered water box is first connected to a water pump through a pipeline and then connected to the water tank. The water pump is electrically connected to the thermoelectric generation sheet whose output electric energy changes along with the temperature difference change between the exchange box and the water tank through the control electric box.

[0013] Preferably, two drainage plates for preventing outflow are fixedly sleeved on the lower connecting plate and are located on both sides of the heat dissipation oil pipe.

[0014] Preferably, the thermoelectric power generation sheet is electrically connected to the power control box, and the power control box is electrically connected to the water pump.

[0015] Preferably, a liquid level display is arranged on the outer side of the hydraulic oil tank, and a fuel filling port is arranged on the top of the hydraulic oil tank.

[0016] Preferably, the oil suction pipe, the oil guide pipe, the first oil pipe, the second oil pipe and the third oil pipe are all high-pressure flexible oil pipes.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects:

[0018] By adopting the one-way limiting component to amplify the working vibration of the servo motor in the vertical direction, the amplitude of the vibration can be amplified by the elastic forces of the first spring and the second spring, and at the same time, the loosening of the fixing bolts caused by the rigid fixation between the servo motor and the hydraulic oil tank is reduced; by controlling the start-stop action of the motor, the vibration can be realized or not, and the self-vibration of the fixed heat dissipation oil pipe transmitted through the lower connecting plate is realized by amplifying the vibration amplitude. The heat dissipation oil pipe can accelerate the heat exchange with the surrounding air along with the vibration, improve the heat dissipation efficiency, and reduce the dust falling on the heat dissipation oil pipe;

[0019] By adding the exchange box, the water tank and the thermoelectric power generation sheet, a large amount of heat will be generated after the hydraulic oil works. The high-temperature hydraulic oil needs to flow back. During the backflow process, the temperature of the exchange box is increased through heat transfer of the exchange box. There is a large temperature difference between the exchange box and the water tank, so as to generate electricity through the thermoelectric power generation sheet. The change of the oil temperature can directly reflect the change of the generated electricity, and the working power of the water pump is controlled to change the drainage volume;

[0020] During the temperature rise process of the return oil pipe, the number of holes in the diversion holes on the regulating tube that can drain liquid can be increased. The liquid discharged through the concentrated groove will flow through the surface of the heat dissipation oil pipe, and then the temperature of the return liquid hydraulic oil in the heat dissipation oil pipe can be taken away. And when the liquid flows through the surface of the heat dissipation oil pipe and vibrates, the contact between the liquid and the air can be improved; and the flowing liquid further strengthens the cleaning effect on the heat dissipation oil pipe, maintains the cooling capacity, and then increases the cooling effect of the hydraulic oil during the backflow process of the hydraulic oil, realizing high-efficiency cooling;

[0021] Through the provided water filtering box, water pump, and pipelines, the liquid flowing through the surface of the heat dissipation oil pipe can be recycled into the water tank. Along with the improvement of the heat dissipation efficiency of water brought by vibration, the return temperature is reduced accordingly. Then, the temperature in the water tank decreases along with the return temperature, which further promotes the change of temperature difference to improve the power generation capacity, thus promoting the power generation of the thermoelectric generator and the working power of the water pump, increasing the pressure in the water tank, and then increasing the drainage volume to achieve the promotion of the heat dissipation work. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The structural schematic diagram of an embodiment of the present invention is given;

[0023] Figure 2 is Figure 1 the enlarged structural schematic diagram of part A of

[0024] Figure 3 is Figure 1 the enlarged structural schematic diagram of part B of

[0025] Figure 4 is Figure 1 the top view of

[0026] Figure 5 is Figure 1 the structural schematic diagram of the adjustment mechanism in

[0027] Figure 6 is Figure 5 the partial structural cross-sectional view of

[0028] Reference numerals:

[0029] 1, hydraulic oil tank;

[0030] 2, bottom plate; 21, fixed column; 22, moving plate; 23, top plate; 24, first spring; 25, second spring;

[0031] 3, servo motor; 31, oil pump;

[0032] 4, output oil supply valve group;

[0033] 5, first oil pipe; 51, exchange box; 52, second oil pipe; 53, heat dissipation oil pipe; 54, vertical plate; 55, lower connecting plate; 56, centralized groove; 57, third oil pipe;

[0034] 6, water tank; 61, thermoelectric generator; 62, power control box; 63, water pump; 64, external discharge pipe;

[0035] 65, adjustment tube; 651, shunt hole; 652, multi-fold rod; 653, piston column; 654, piston; 655, thin outer cylinder; 656, liquid storage cylinder;

[0036] 66. Filter water box. Detailed implementation mode

[0037] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Embodiment

[0038] As Figures 1-6 shown, the efficient hydraulic energy-saving system based on a servo motor-driven hydraulic station proposed by the present invention includes a hydraulic oil tank 1 and a servo motor 3. The hydraulic oil tank 1 and the servo motor 3 are fixed through a one-way limiting component for realizing one-way vibration amplification. A liquid level display is arranged outside the hydraulic oil tank 1. A fuel filling port is arranged at the top of the hydraulic oil tank 1, and a fuel filling cap is arranged on the fuel filling port. The hydraulic oil tank 1 adopts an integrally formed stainless steel oil tank.

[0039] The one-way limiting component includes a bottom plate 2 fixed to the hydraulic oil tank 1. Four fixing columns 21 are fixed on the upper side of the bottom plate 2. The upper end of each fixing column 21 is fixed with a top plate 23. Two moving plates 22 are jointly movably sleeved on the two fixing columns 21 on the same side. The two moving plates 22 are jointly fixed to the servo motor 3. A first spring 24 and a second spring 25 are sleeved on each fixing column 21 and are respectively located on both sides of the moving plate 22. In this embodiment, the first spring 24 is arranged on the lower side of the moving plate 22, and the second spring 25 is arranged on the upper side of the moving plate 22. The elastic force of the first spring 24 is greater than that of the second spring 25 to overcome the gravity of the servo motor 3.

[0040] An oil pump 31 connected to the hydraulic oil tank 1 through an oil suction pipe is installed on the servo motor 3. The oil pump 31 is connected to an output oil supply valve group 4 fixed on the upper side of the hydraulic oil tank 1 through a guide pipe. The oil pump 31 is connected to a return pipe assembly for increasing the natural heat dissipation energy efficiency through a control valve and cooperating with the one-way limiting component. In this embodiment, both the oil suction pipe and the return pipe are high-pressure flexible hoses.

[0041] The return pipe assembly includes a first oil pipe 5 connected to the control valve. The first oil pipe 5 is connected to an exchange box 51. The exchange box 51 is connected to a second oil pipe 52. The second oil pipe 52 is connected to a heat dissipation oil pipe 53. The other end of the heat dissipation oil pipe 53 is connected to the hydraulic oil tank 1 through a third oil pipe 57. A vertical plate 54 is fixed on the heat dissipation oil pipe 53. A centralized groove 56 is jointly fixed on the upper sides of the two vertical plates 54. A plurality of water outlet holes for discharging water are arranged on the lower side of the centralized groove 56. An outer discharge pipe 64 extends to the inside of the centralized groove 56. The lower end of the vertical plate 54 is fixed with a lower connecting plate 55 fixed to the moving plate 22 for conducting the vibration of the servo motor 3 transmitted by the heat dissipation oil pipe 53. Two drainage plates for preventing outward flow are fixedly sleeved on the lower connecting plate 55 and are located on both sides of the heat dissipation oil pipe 53. The first oil pipe 5, the second oil pipe 52, and the third oil pipe 57 are all high-pressure flexible hoses. A cooling component for cooling the heat dissipation oil pipe 53 is arranged on the upper side of the hydraulic oil tank 1.

[0042] The cooling assembly includes a water tank 6 fixed on the hydraulic oil tank 1. In this embodiment, a drain valve is provided on one side of the water tank 6, and a water injection port is provided at the top of the water tank 6. The liquid used to cool the heat dissipation oil pipe 53 in this embodiment is water, which is more convenient to use, has a wider source, and lower cost. An installation plate is fixed on one side of the water tank 6, and the exchange box 51 is fixed on the installation plate. A thermoelectric generator 61 that generates electricity by utilizing the temperature difference between the exchange box 51 and the water tank 6 is arranged between the exchange box 51 and the water tank 6. In this embodiment, the thermoelectric generator 61 can generate electricity through the temperature difference on both sides. A control box 62 that provides a control switch and outputs electric energy for the thermoelectric generator 61 is arranged on the water tank 6. In this embodiment, a battery pack for storing the electricity generated by the thermoelectric generator 61 is arranged in the control box 62, and a control switch is provided. The thermoelectric generator 61 is electrically connected to the control box 62. An outer drain pipe 64 is connected and communicated on one side of the water tank 6, and a valve is arranged on the outer drain pipe 64 for controlling the switch. An adjusting assembly for adaptively adjusting the heat dissipation effect on the heat dissipation oil pipe 53 through temperature difference changes is arranged on the outer drain pipe 64;

[0043] The adjusting assembly includes an adjusting tube 65 slidably inserted into one end of the outer drain pipe 64. One end of the outer drain pipe 64 extends into the adjusting tube 65, and a sealing sleeve fixedly sleeved on the outer drain pipe 64 is arranged at the end of the outer drain pipe 64 to prevent leakage. A plurality of diversion holes 651 are equidistantly arranged on the lower side of the adjusting tube 65. A multi-fold rod 652 is fixed on the diversion hole 651. A piston column 653 is fixed at the free end of the multi-fold rod 652. A piston 654 is fixed at the free end of the piston column 653. A thin outer cylinder 655 is movably sleeved on the piston 654. One end of the piston column 653 penetrates through the thin outer cylinder 655 and is fixed to the piston 654. A liquid storage cylinder 656 that is connected and fixedly inserted into the second oil pipe 52 is fixed on the thin outer cylinder 655. An expansion liquid is arranged in the cavity formed by the piston 654 and the liquid storage cylinder 656. In this embodiment, the expansion liquid can be selected as alcohol or kerosene. In this embodiment, kerosene is used as the expansion liquid, which has an expansion effect and can also have a lubricating effect.

[0044] In this embodiment, before the hydraulic station is used, it is necessary to first fill the water tank 6 with sufficient water for cooling, and the water tank 6 is in a closed state; when the hydraulic station starts to work, the servo motor 3 starts to work. During the operation of the servo motor 3, a vibration effect will be generated. At the same time of vibration, the vibration of the servo motor 3 causes the first spring 24 and the second spring 25 to undergo small-scale telescopic deformation in the vertical direction. Through the setting of the fixed column 21, the vibration mode of the servo motor 3 itself can be amplified in the vertical direction. Then, the moving plate 22 fixed to the servo motor 3 and the lower connecting plate 55 vibrate. The vibration of the lower connecting plate 55 causes the heat dissipation oil pipe 53 itself to vibrate through the vertical plate 54. Under the action of vibration, relative movement occurs between the heat dissipation oil pipe 53 itself and the air around the heat dissipation oil pipe 53. In this way, the heat dissipation effect of the heat dissipation oil pipe 53 itself is accelerated.

[0045] Since the hydraulic oil during the operation of the hydraulic station has a high temperature when it flows back, the hydraulic oil flowing back through the first oil pipe 5 will pass through the exchange box 51 and then flow back to the hydraulic oil tank 1 through the second oil pipe 52, the heat dissipation oil pipe 53, and the third oil pipe 57 in sequence. The heat of the flowing-back oil is transferred through the exchange box 51. Then, the thermoelectric generator 61 between the exchange box 51 and the water tank 6 will generate electricity by the temperature difference between the exchange box 51 and the water tank 6, and the generated electric energy is supplied to the water pump 63 to work through the power control box 62;

[0046] After the water tank 6 is filled with water, the valve on the outer discharge pipe 64 is opened, and the water discharged through the outer discharge pipe 64 flows into the adjustment tube 65; and when the temperature of the flowing-back oil in the exchange box 51 rises, the expansion liquid in the liquid storage cylinder 656 will expand, pushing the piston 654 to move. Then, the piston column 653 connected to the piston 654 moves, and then the piston column 653 drives the multi-fold lever 652 and the adjustment tube 65 to move. The adjustment tube 65 will slide with the outer discharge pipe 64, so that the number of holes in the diversion holes 651 on the adjustment tube 65 through which water can flow increases with the increase of temperature, thereby providing the drainage speed. The water will flow into the concentration tank 56 and be discharged to the surface of the heat dissipation oil pipe 53 through a plurality of water outlet holes, flow on the surface of the heat dissipation oil pipe 53 under the action of gravity, take away the heat of the heat dissipation oil pipe 53 itself, and then cool the flowing-back oil flowing in the heat dissipation oil pipe 53. And along with the vibration of the heat dissipation oil pipe 53, the flowing water and the air move relatively, thereby increasing its own heat dissipation, achieving an efficient energy-saving heat dissipation effect. Embodiment

[0047] Such as Figures 3-4As shown in the figure, the efficient hydraulic energy-saving system based on a servo-motor-driven hydraulic station proposed by the present invention, based on Embodiment 1, further includes: on the upper side of the hydraulic oil tank 1, there is a recovery component for recycling the liquid used to cool the heat dissipation oil pipe 53. The recovery component includes a filter water box 66 disposed on the hydraulic oil tank 1 and below the heat dissipation oil pipe 53 for collecting the liquid discharged from the outer discharge pipe 64. A filter plate is provided at the inner bottom of the filter water box 66 through a support member. In this embodiment, the filter plate is a filter cotton plate. A water pump 63 is provided on the water tank 6. The filter water box 66 is connected to the input end of the water pump 63 through a first water pipe, and the output end of the water pump 63 is connected to the water tank 6 through a second water pipe. The water pump 63 is electrically connected to a thermoelectric power generation sheet 61 that outputs a change in electric energy along with the change in the temperature difference between the exchange box 51 and the water tank 6 through a control electric box 62.

[0048] In this embodiment, before use, add sufficient water to the filter water box 66. When the water flowing on the surface of the heat dissipation oil pipe 53 flows into the filter water box 66, then turn on the water pump 63 to pump the water in the filter water box 66 back into the water tank 6, so as to keep the water volume in the water tank 6 and realize the water flow cycle. And when the temperature of the return oil pipe rises, the temperature difference between the exchange box 51 and the water tank 6 becomes larger, thereby increasing the working power of the water pump 63, and further strengthening the water outflow volume in the water tank 6, achieving the purpose that the higher the return oil temperature, the better the heat dissipation efficiency, and being energy-saving and environment-friendly. When the motor 3 is working and vibrating, due to the vibration effect, the heat dissipation capacity of the water flowing through the heat dissipation oil pipe increases, and then the temperature of the water flowing back into the water tank 6 through the water pump will gradually decrease, thereby promoting the power generation of the thermoelectric power generation sheet 61, promoting the working power of the water pump 63, causing the pressure in the water tank 6 to rise, and then increasing the drainage volume, so as to promote the heat dissipation work.

[0049] The above specific embodiments are only several preferred embodiments of the present invention. Based on the technical solution of the present invention and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. An efficient hydraulic energy-saving system based on a servo-motor-driven hydraulic station, characterized in that: It includes a hydraulic oil tank (1) and a servo motor (3), and the hydraulic oil tank (1) and the servo motor (3) are fixed through a one-way limiting component for realizing one-way vibration amplification; The one-way limiting component includes a bottom plate (2) fixed to the hydraulic oil tank (1). Four fixing columns (21) are fixed on the upper side of the bottom plate (2). The upper end of each fixing column (21) is fixed with a top plate (23). Two fixing columns (21) on the same side are jointly sleeved with a moving plate (22). The two moving plates (22) are jointly fixed to the servo motor (3). A first spring (24) and a second spring (25) are sleeved on each fixing column (21) and are respectively located on both sides of the moving plate (22); An oil pump (31) connected to the hydraulic oil tank (1) through an oil suction pipe is installed on the servo motor (3). The oil pump (31) is connected to an output oil supply valve group (4) fixed on the upper side of the hydraulic oil tank (1) through a guide oil pipe. A return oil pipe assembly for increasing the natural heat dissipation efficiency in cooperation with the one-way limiting component is connected to the oil pump (31) through a control valve; The return oil pipe assembly includes an oil pipe one (5) connected to the control valve. The oil pipe one (5) is connected to an exchange box (51). An oil pipe two (52) is connected to the exchange box (51). The oil pipe two (52) is connected to a heat dissipation oil pipe (53). The other end of the heat dissipation oil pipe (53) is connected to the hydraulic oil tank (1) through an oil pipe three (57). A vertical plate (54) is fixed on the heat dissipation oil pipe (53). A lower connecting plate (55) for conducting the vibration of the servo motor (3) to the heat dissipation oil pipe (53) is fixed at the lower end of the vertical plate (54). A cooling component for cooling the heat dissipation oil pipe (53) is arranged on the upper side of the hydraulic oil tank (1); The cooling component includes a water tank (6) fixed on the hydraulic oil tank (1). A mounting plate is fixed on one side of the water tank (6). The exchange box (51) is fixed on the mounting plate. A thermoelectric generation sheet (61) for generating electricity by utilizing the temperature difference between the exchange box (51) and the water tank (6) is arranged between the exchange box (51) and the water tank (6). A control electric box (62) for providing a control switch to output electric energy for the thermoelectric generation sheet (61) is arranged on the water tank (6). An outer discharge pipe (64) is communicated and connected to one side of the water tank (6). An adjusting component for adaptively adjusting the heat dissipation effect on the heat dissipation oil pipe (53) through temperature difference change is arranged on the outer discharge pipe (64). A recovery component for recycling the liquid used for cooling the heat dissipation oil pipe (53) is arranged on the upper side of the hydraulic oil tank (1); The adjusting assembly includes an adjusting tube cylinder (65) that is slidably inserted into one end of the outer discharge pipe (64). One end of the outer discharge pipe (64) extends into the adjusting tube cylinder (65). A plurality of shunt holes (651) are equidistantly arranged on the lower side of the adjusting tube cylinder (65). A multi-fold rod (652) is fixed on the shunt hole (651). A piston column (653) is fixed at the free end of the multi-fold rod (652). A piston (654) is fixed at the free end of the piston column (653). A thin outer cylinder (655) is movably sleeved on the piston (654). One end of the piston column (653) penetrates through the thin outer cylinder (655) and is fixed to the piston (654). A liquid storage cylinder (656) that is connected and fixedly inserted into the exchange box (51) is fixed on the thin outer cylinder (655). An expansion liquid is arranged in the cavity formed by the piston (654) and the liquid storage cylinder (656).

2. The high-efficiency hydraulic energy-saving system based on a servo-motor-driven hydraulic station according to claim 1, wherein: A concentration tank (56) is commonly fixed on the upper sides of the two vertical plates (54). A plurality of water outlet holes for discharging water are arranged on the lower side of the concentration tank (56). The outer discharge pipe (64) extends into the inner side of the concentration tank (56).

3. The high-efficiency hydraulic energy-saving system based on a servo-motor-driven hydraulic station according to claim 1, characterized in that: The recovery assembly includes a filtered water box (66) that is arranged on the hydraulic oil tank (1) and is located below the heat dissipation oil pipe (53) for collecting the liquid discharged from the outer discharge pipe (64). A filter plate is arranged on the inner bottom of the filtered water box (66) through a support member. The filtered water box (66) is first connected to a water pump (63) through a pipeline and then connected to a water tank (6). The water pump (63) is electrically connected to a thermoelectric power generation sheet (61) that outputs electrical energy changes along with the temperature difference change between the exchange box (51) and the water tank (6) through a control electric box (62).

4. The high-efficiency hydraulic energy-saving system based on a servo-motor-driven hydraulic station according to claim 1, wherein: Two drainage plates for preventing outflow are fixedly sleeved on the lower connecting plate (55) and are located on both sides of the heat dissipation oil pipe (53).

5. The high-efficiency hydraulic energy-saving system based on a servo-motor-driven hydraulic station according to claim 3, characterized in that: The thermoelectric power generation sheet (61) is electrically connected to the control electric box (62), and the control electric box (62) is electrically connected to the water pump (63).

6. The high-efficiency hydraulic energy-saving system based on a servo-motor-driven hydraulic station according to claim 1, wherein: A liquid level display is arranged on the outer side of the hydraulic oil tank (1), and a fuel filling port is arranged on the top of the hydraulic oil tank (1).

7. The high-efficiency hydraulic energy-saving system based on a servo-motor-driven hydraulic station according to claim 1, characterized in that: The oil suction pipe, the oil guide pipe, the first oil pipe (5), the second oil pipe (52), and the third oil pipe (57) are all high-pressure flexible oil pipes.

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