Auxiliary kinetic energy recovery device for oil-to-electricity conversion of engineering vehicle and use method of auxiliary kinetic energy recovery device

Abstract

The invention discloses an auxiliary kinetic energy recovery device for oil-to-electricity conversion of an engineering vehicle and a using method thereof, and relates to the field of kinetic energy recovery. The device comprises a power recovery unit and a potential energy recovery tank, wherein an oil cylinder is mounted beside the potential energy recovery tank; the potential energy recovery oil pipe is fixedly mounted in the potential energy recovery tank; the outer limiting frame bodies are annularly distributed and mounted on the potential energy recovery oil pipe in a linear array manner; the high-pressure air bag is arranged in the outer limiting frame body, high-pressure gas is contained in the high-pressure air bag, and the outer limiting frame body is used for restraining the maximum size of the high-pressure air bag; and the inner crusty pancake is mounted in the high-pressure air bag. According to the device, the high-pressure impact load generated by the large oil cylinder is decomposed into a plurality of small air bag units to be borne together, the stress peak value and cyclic fatigue of a single component are reduced, the pressure transmission path is shortened, the response time is shortened, flexible cooperation with output of a main pump is achieved, and the adaptability and overall energy efficiency of a system to different operation modes are enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of kinetic energy recovery, in particular to an auxiliary kinetic energy recovery device for engineering vehicles converting from oil to electricity and a method of using the same. BACKGROUND

[0002] In the process of engineering vehicles converting from oil to electricity, the auxiliary kinetic energy recovery system generally includes two types: electric regenerative braking for vehicle driving kinetic energy and hydraulic recovery for the gravitational potential energy of the working device. Among them, the electric regenerative braking mainly reverses the driving motor as a generator to convert the kinetic energy during braking into electrical energy and store it in the battery. For engineering machinery such as shovel trucks, the main energy-saving potential lies in the huge gravitational potential energy generated by the frequent lifting and lowering of working devices such as booms and buckets, so hydraulic potential energy recovery systems are generally introduced.

[0003] The core of the system is to install a hydraulic accumulator in parallel in the hydraulic circuit. When the working device is lowered, the driving hydraulic motor / pump stores high-pressure oil into the accumulator, converting potential energy into hydraulic pressure energy storage. When the device needs to be raised, the accumulator releases pressure oil to assist driving, thereby reducing the load of the main pump and achieving the purpose of energy saving.

[0004] However, the existing potential energy recovery technology, especially the accumulator-based scheme, has several shortcomings. First, the common system architecture of potential energy recovery is to directly parallel a single accumulator to the cylinder port or the main pressure oil circuit. This simple parallel method, when facing large-flow and high-power oil cylinders, all recovery pressures are directly concentrated on the accumulator, especially the rubber capsule inside, which is prone to material fatigue and rupture failure due to pressure peak impact and frequent large compression and expansion, and the reliability is challenged. Second, due to the installation position of the accumulator and the pipeline distance between the oil cylinder, as well as the response inertia of gas compression and expansion, the system has inherent reaction lag, which cannot achieve precise synchronization with the rapid start-stop and reversing action of the oil cylinder, resulting in poor timing of recovery and release and discounted energy conversion efficiency. Third, as an independent energy storage unit, the energy release direction of the accumulator is single and fixed, making it difficult to flexibly adapt to complex and variable multi-executive mechanism cooperative operation requirements. In view of the above situation, the present application provides an auxiliary kinetic energy recovery device for engineering vehicles converting from oil to electricity and a method of using the same to solve the above problems. SUMMARY

[0005] In view of the deficiencies of the prior art, the auxiliary kinetic energy recovery device for engineering vehicle oil-to-electricity and the use method thereof are provided, which solves the problem that the common potential energy recovery system architecture is to directly connect a single accumulator in parallel with the oil cylinder port or the main pressure oil way, and the simple parallel connection mode directly concentrates all the recovery pressure on the accumulator, especially the rubber capsule inside the accumulator, which is prone to material fatigue and rupture failure due to pressure peak impact and frequent large compression expansion, and the reliability is challenged; secondly, due to the pipeline distance between the accumulator installation position and the oil cylinder, and the response inertia of gas compression expansion, the system has inherent reaction lag, and cannot realize precise synchronization with the rapid start-stop and reversing action of the oil cylinder, resulting in poor timing of recovery and release and discounted energy conversion efficiency; thirdly, as an independent energy storage unit, the energy release direction of the accumulator is single and fixed, and it is difficult to flexibly adapt to the complex and variable multi-executive mechanism cooperative operation demand.

[0006] To achieve the above object, the technical scheme provided by the present application is as follows: the auxiliary kinetic energy recovery device for engineering vehicle oil-to-electricity, comprising a power recovery unit, a potential energy recovery tank, a potential energy recovery oil pipe, an outer limiting frame, a high-pressure gas bag and an inner oil cavity, wherein the power recovery unit is used for converting kinetic energy into electric energy during braking, the potential energy recovery tank is installed beside the oil cylinder, the top end of the potential energy recovery tank is in communication with the upper part oil cavity of the piston in the oil cylinder, the potential energy recovery oil pipe is fixedly installed in the potential energy recovery tank, the potential energy recovery oil pipe is in communication with the lower part oil cavity of the piston in the oil cylinder, the outer limiting frame is linearly arrayed and annularly distributed and installed on the potential energy recovery oil pipe, and the outer limiting frame is in communication with the potential energy recovery tank, the high-pressure gas bag is arranged in the outer limiting frame, the high-pressure gas bag is fixedly installed at the side end of the potential energy recovery oil pipe, the high-pressure gas bag contains high-pressure gas, the outer limiting frame is used for limiting the maximum size of the high-pressure gas bag, and the inner oil cavity is installed in the high-pressure gas bag and in communication with the potential energy recovery oil pipe.

[0007] Preferably, a first tank cavity is formed in the potential energy recovery tank, the first tank cavity is filled with industrial oil, a communication valve is arranged at the top end of the potential energy recovery tank, the communication valve is used for supplementing industrial oil, a power output rod is arranged at the upper end of the oil cylinder, the power output rod is connected with a shovel, a front end oil outlet is formed in the side surface of the upper end of the oil cylinder, the front end oil outlet is in communication with the upper part oil cavity of the piston in the oil cylinder, a rear end oil outlet is formed in the bottom end of the oil cylinder, and the rear end oil outlet is in communication with the lower part oil cavity of the piston in the oil cylinder.

[0008] Preferably, an upper oil way communication pipe is fixedly connected with the side surface of the upper end of the potential energy recovery tank, the upper oil way communication pipe is connected with the front end oil outlet, a lower oil way communication hole is formed in the bottom end of the potential energy recovery tank, and the output end of the potential energy recovery oil pipe is installed on the lower oil way communication hole.

[0009] Preferably, a power oil conveying main pipe is externally mounted on the rear oil outlet, the end of the power oil conveying main pipe is bifurcated into a side communication pipe and an oil pump communication pipe, the side communication pipe is communicated with the potential energy recovery oil pipe, a split oil baffle is fixedly connected at the three-way junction of the side communication pipe and the oil pump communication pipe, the split oil baffle is used for splitting or collecting the oil in the power oil conveying main pipe, a split fine pipe is fixedly connected on the potential energy recovery oil pipe, the inner oil cavity is communicated with the split fine pipe, and the inner oil cavity is used for absorbing or releasing the industrial oil in the power oil conveying main pipe.

[0010] Preferably, a frame sealing plate is fixedly connected at the bottom end of the outer limiting frame, a frame communication hole is formed in the frame sealing plate, the second outer oil chamber is formed between the outer limiting frame and the frame sealing plate, the frame communication hole is used for communicating the second outer oil chamber and the first tank cavity, the front end of the high-pressure air bag is fixedly connected with a fixed front ring plate, the inner oil cavity is fixedly connected on the fixed front ring plate, and the third gas chamber is formed in the high-pressure air bag.

[0011] Preferably, the use method comprises the following steps:

[0012] S1. Kinetic energy recovery: when the oil pump absorbs oil and the oil cylinder rod moves back, the piston in the oil cylinder moves downward, the upper oil passage communication pipe conveys the industrial oil to the oil cylinder, the oil in the potential energy recovery tank decreases, the first tank cavity in the potential energy recovery tank is a sealed cavity, the decrease in the oil volume forces the high-pressure air bag to expand outward to adapt to the decrease in the oil volume, the expansion of the high-pressure air bag forces the high-pressure gas in the third gas chamber to drive the inner oil cavity to expand outward, thereby the inner oil cavity extracts part of the oil in the power oil conveying main pipe for storage, and the potential energy storage stage is completed;

[0013] S2. Kinetic energy release: when the oil pump discharges oil and the oil cylinder rod moves out, the piston in the oil cylinder moves upward, the upper oil passage communication pipe conveys the industrial oil to the potential energy recovery tank, the oil in the potential energy recovery tank increases, the increase in the oil volume forces the high-pressure air bag to shrink inward to adapt to the increase in the oil volume, at this time, the inner oil cavity releases and outputs the internal storage oil under the double extrusion of the potential energy of the high-pressure gas and the increase in the oil volume, part of the oil output to the oil cylinder in the power oil conveying main pipe is output from the potential energy recovery oil pipe, and the kinetic energy output of the oil pump is reduced.

[0014] The technical effects and advantages of the present application are as follows:

[0015] The auxiliary kinetic energy recovery device for the oil-to-electricity conversion of the engineering vehicle and the use method thereof solve the reliability problems of easy fatigue and easy breakage caused by the pressure concentrated on a single accumulator bag body in the traditional scheme; the distributed air bag array and the limiting structure are designed to decompose the high-pressure impact load generated by the large oil cylinder into multiple small air bag units to be jointly borne, the stress peak value and the cyclic fatigue of a single component are reduced, and the system durability and the working reliability are significantly improved.

[0016] This auxiliary kinetic energy recovery device for converting engineering vehicles from gasoline to electric power, along with its usage method, solves the problem of delayed energy recovery and release caused by the remote installation location and slow gas response of existing energy accumulators. By compactly integrating the potential energy recovery module with the working cylinder, the cylinder's movement and the energy storage unit's response are almost synchronized, shortening the pressure transmission path and response time. This enables rapid capture and immediate auxiliary release of potential energy, improving the operational response speed.

[0017] This auxiliary kinetic energy recovery device and its usage method for converting engineering vehicles from oil to electricity solves the problem of traditional independent energy accumulators having a single energy release path and being unable to flexibly adapt to complex dynamic working conditions. Through integrated internal oil circuit and diversion design, the recovered potential energy can be used as a flexibly dispatchable auxiliary power source to directly supplement the main oil circuit as needed and proportionally, realizing flexible coordination with the main pump output and enhancing the system's adaptability to different operating modes and overall energy efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall potential energy recovery of the present invention;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure for potential energy recovery according to the present invention;

[0021] Figure 3 This is a schematic diagram of the potential energy recovery explosion structure of the present invention;

[0022] Figure 4 This is a schematic cross-sectional view of the main oil pipeline of the present invention;

[0023] Figure 5 This is a schematic diagram of the cross-sectional structure of the outer limiting frame of the present invention;

[0024] Figure 6 This is a schematic diagram of the cross-sectional structure of the high-pressure airbag of the present invention;

[0025] Figure 7 This is a schematic diagram of the overall structure of the modified gasoline vehicle of the present invention.

[0026] In the diagram: 1. Power recovery unit; 2. Hydraulic cylinder; 21. Power output rod; 22. Front oil outlet; 23. Rear oil outlet; 3. Potential energy recovery tank; 31. First tank chamber; 32. Connecting valve; 33. Upper oil circuit connecting pipe; 34. Lower oil circuit connecting hole; 4. Power oil supply main pipe; 41. Side connecting pipe; 42. Oil pump connecting pipe; 43. Oil distribution baffle; 5. Potential energy recovery oil pipe; 51. Branching thin pipe; 6. Outer limiting frame; 61. Frame connecting hole; 62. Frame sealing plate; 63. Second outer oil chamber; 7. High-pressure airbag; 71. Third air chamber; 72. Fixed front ring plate; 8. Inner oil tank. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0029] This invention discloses an auxiliary kinetic energy recovery device for converting engineering vehicles from gasoline to electric power, and its usage method, according to the appendix. Figures 1 to 7 As shown, the device includes a power recovery unit 1, a potential energy recovery tank 3, a potential energy recovery oil pipe 5, an outer limiting frame 6, a high-pressure airbag 7, and an inner oil tank 8. The power recovery unit 1 is used to convert the kinetic energy during braking into electrical energy. A hydraulic cylinder 2 is installed next to the potential energy recovery tank 3. The top of the potential energy recovery tank 3 is connected to the upper part of the oil chamber of the piston in the hydraulic cylinder 2. The potential energy recovery oil pipe 5 is fixedly installed inside the potential energy recovery tank 3 and is connected to the lower part of the oil chamber of the piston in the hydraulic cylinder 2. The outer limiting frame 6 is linearly arrayed and ring-shaped and installed on the potential energy recovery oil pipe 5. It is connected to the potential energy recovery tank 3. The high-pressure airbag 7 is located inside the outer limiting frame 6 and is fixedly installed on the side end of the potential energy recovery oil pipe 5. The high-pressure airbag 7 contains high-pressure gas. The outer limiting frame 6 is used to constrain the maximum size of the high-pressure airbag 7. The inner oil tank 8 is installed inside the high-pressure airbag 7 and is connected to the potential energy recovery oil pipe 5.

[0030] In this embodiment, the high-pressure airbag 7 serves as a buffer zone for the double-layered oil inside and outside the potential energy recovery tank 3, and as a means to provide potential energy to squeeze the inner oil naan 8.

[0031] According to the appendix Figures 2 to 4As shown, further, a first tank chamber 31 is formed inside the potential energy recovery tank 3. The first tank chamber 31 is filled with industrial oil. A connecting valve 32 is provided at the top of the potential energy recovery tank 3. The connecting valve 32 is used to replenish industrial oil. A power output rod 21 is provided at the upper end of the oil cylinder 2. The power output rod 21 is connected to the bucket. A front oil outlet 22 is opened on the side of the upper end of the oil cylinder 2. The front oil outlet 22 is connected to the upper part of the oil chamber of the piston inside the oil cylinder 2. A rear oil outlet 23 is opened at the bottom end of the oil cylinder 2. The rear oil outlet 23 is connected to the lower part of the oil chamber of the piston inside the oil cylinder 2.

[0032] According to the appendix Figures 3 to 4 As shown, further, an upper oil passage connecting pipe 33 is fixedly connected to the upper side of the potential energy recovery tank 3. The upper oil passage connecting pipe 33 is connected to the front oil outlet 22. A lower oil passage connecting hole 34 is opened at the bottom of the potential energy recovery tank 3. The output end of the potential energy recovery oil pipe 5 is installed on the lower oil passage connecting hole 34.

[0033] According to the appendix Figures 3 to 5 As shown, a power oil supply main pipe 4 is installed outside the rear oil outlet 23. The end of the power oil supply main pipe 4 branches into a side connecting pipe 41 and an oil pump connecting pipe 42. The side connecting pipe 41 is connected to the potential energy recovery oil pipe 5. An oil distribution baffle 43 is fixedly connected at the tee between the side connecting pipe 41 and the oil pump connecting pipe 42. The oil distribution baffle 43 is used to divert or collect the oil in the power oil supply main pipe 4. A branched thin pipe 51 is fixedly connected to the potential energy recovery oil pipe 5. The inner oil tank 8 is connected to the branched thin pipe 51. The inner oil tank 8 is used to absorb or release the industrial oil in the power oil supply main pipe 4.

[0034] According to the appendix Figures 6 to 7 As shown, a frame sealing plate 62 is installed at the bottom of the outer limiting frame 6. A frame connecting hole 61 is provided on the frame sealing plate 62. A second outer oil chamber 63 is formed between the outer limiting frame 6 and the frame sealing plate 62. The frame connecting hole 61 is used to connect the second outer oil chamber 63 and the first tank chamber 31. A fixed front ring plate 72 is fixedly connected to the front end of the high-pressure airbag 7. The inner oil bladder 8 is fixedly installed on the fixed front ring plate 72. A third air chamber 71 is formed inside the high-pressure airbag 7.

[0035] According to the appendix Figures 1 to 7 As shown, it is particularly important to emphasize that the usage method includes the following steps:

[0036] S1. Kinetic Energy Recovery: When the oil pump 2 draws in oil and the cylinder 2 returns to its original position, the piston inside the cylinder 2 moves downward, causing the upper oil passage connecting pipe 33 to deliver industrial oil into the cylinder 2. As a result, the oil in the potential energy recovery tank 3 decreases. Since the first tank chamber 31 inside the potential energy recovery tank 3 is a sealed chamber, the decrease in oil volume forces the high-pressure airbag 7 to expand outward to adapt to the decrease in oil volume. The expansion of the high-pressure airbag 7 forces the high-pressure gas in the third air chamber 71 to drive the inner oil tank 8 to expand outward, thereby causing the inner oil tank 8 to draw a portion of oil from the power oil supply main pipe 4 for storage, completing the potential energy storage stage.

[0037] S2. Kinetic Energy Release: When oil pump 2 outputs oil, causing oil cylinder 2 to extend its rod, the piston inside oil cylinder 2 moves upward, causing the upper oil passage connecting pipe 33 to deliver industrial oil to the potential energy recovery tank 3. As a result, the amount of oil in the potential energy recovery tank 3 increases, and the increased oil volume forces the high-pressure air bag 7 to contract inward to accommodate the increased oil volume. At this time, the inner oil bladder 8 rapidly releases and outputs the internally stored oil under the dual compression of the potential energy pressure of the high-pressure gas and the increased oil volume. This causes a portion of the oil output from the power oil supply main pipe 4 to the oil cylinder 2 to be output from the potential energy recovery oil pipe 5, reducing the kinetic energy output of oil pump 2.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An auxiliary kinetic energy recovery device for converting engineering vehicles from gasoline to electric power, characterized in that, include: The energy recovery unit (1) is used to convert the kinetic energy of the engineering vehicle during braking into electrical energy; Potential energy recovery tank (3), with a hydraulic cylinder (2) installed next to the potential energy recovery tank (3), the top of the potential energy recovery tank (3) being connected to the upper part of the oil chamber of the piston inside the hydraulic cylinder (2); Potential energy recovery oil pipe (5), the potential energy recovery oil pipe (5) is fixedly installed in the potential energy recovery tank (3), and the potential energy recovery oil pipe (5) is connected to the lower part of the oil chamber of the piston in the oil cylinder (2); The outer limiting frame (6) is linearly arrayed and ring-distributed on the potential energy recovery oil pipe (5), and is connected to the potential energy recovery tank (3); High-pressure airbag (7), the high-pressure airbag (7) is set inside the outer limiting frame (6), the high-pressure airbag (7) is fixedly installed on the side end of the potential energy recovery oil pipe (5), the high-pressure airbag (7) contains high-pressure gas, and the outer limiting frame (6) is used to constrain the maximum size of the high-pressure airbag (7); The inner oil naan (8) is installed inside the high-pressure airbag (7) and is connected to the potential energy recovery oil pipe (5).

2. The auxiliary kinetic energy recovery device for converting engineering vehicles from gasoline to electricity according to claim 1, characterized in that, The potential energy recovery tank (3) forms a first tank chamber (31), which is filled with industrial oil. A connecting valve (32) is provided at the top of the potential energy recovery tank (3), and the connecting valve (32) is used to replenish the industrial oil.

3. The auxiliary kinetic energy recovery device for converting engineering vehicles from gasoline to electricity according to claim 1, characterized in that, The upper end of the cylinder (2) is provided with a power output rod (21), which is connected to the bucket. The upper side of the cylinder (2) is provided with a front oil outlet (22), which is connected to the upper part of the oil chamber of the piston inside the cylinder (2). The bottom end of the cylinder (2) is provided with a rear oil outlet (23), which is connected to the lower part of the oil chamber of the piston inside the cylinder (2).

4. The auxiliary kinetic energy recovery device for converting engineering vehicles from gasoline to electricity according to claim 3, characterized in that, The upper side of the potential energy recovery tank (3) is fixedly connected to an upper oil passage connecting pipe (33), which is connected to the front oil outlet (22). The bottom end of the potential energy recovery tank (3) is provided with a lower oil passage connecting hole (34), and the output end of the potential energy recovery oil pipe (5) is installed on the lower oil passage connecting hole (34).

5. The auxiliary kinetic energy recovery device for converting engineering vehicles from gasoline to electricity according to claim 4, characterized in that, A power oil supply main pipe (4) is installed outside the rear oil outlet (23). The end of the power oil supply main pipe (4) is branched into a side connecting pipe (41) and an oil pump connecting pipe (42). The side connecting pipe (41) is connected to the potential energy recovery oil pipe (5).

6. The auxiliary kinetic energy recovery device for converting engineering vehicles from gasoline to electricity according to claim 5, characterized in that, An oil distribution baffle (43) is fixedly connected at the tee between the side connecting pipe (41) and the oil pump connecting pipe (42). The oil distribution baffle (43) is used to divert or collect the oil in the power oil pipeline (4). A branched thin pipe (51) is fixedly connected to the potential energy recovery oil pipe (5). The inner oil tank (8) is connected to the branched thin pipe (51). The inner oil tank (8) is used to absorb or release industrial oil in the power oil pipeline (4).

7. The auxiliary kinetic energy recovery device for converting engineering vehicles from gasoline to electricity according to claim 6, characterized in that, The bottom end of the outer limiting frame (6) is equipped with a frame sealing plate (62), and a frame connecting hole (61) is provided on the frame sealing plate (62). A second outer oil chamber (63) is formed between the outer limiting frame (6) and the frame sealing plate (62). The frame connecting hole (61) is used to connect the second outer oil chamber (63) and the first tank chamber (31).

8. The auxiliary kinetic energy recovery device for converting engineering vehicles from gasoline to electric as described in claim 7, characterized in that, The front end of the high-pressure airbag (7) is fixedly connected to a fixed front ring plate (72), and the inner oil sac (8) is fixedly installed on the fixed front ring plate (72). A third air chamber (71) is formed inside the high-pressure airbag (7).

9. A method of using an auxiliary kinetic energy recovery device for converting a construction vehicle from gasoline to electric, used to control the auxiliary kinetic energy recovery device for converting a construction vehicle from gasoline to electric as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Kinetic Energy Recovery: When the oil pump (2) draws in oil and the oil cylinder (2) returns to its original position, the piston inside the oil cylinder (2) moves downward, causing the upper oil passage connecting pipe (33) to deliver industrial oil into the oil cylinder (2). As a result, the oil in the potential energy recovery tank (3) decreases. Since the first tank chamber (31) inside the potential energy recovery tank (3) is a sealed chamber, the decrease in oil volume forces the high-pressure airbag (7) to expand outward to adapt to the decrease in oil volume. The expansion of the high-pressure airbag (7) forces the high-pressure gas in the third air chamber (71) to drive the inner oil tank (8) to expand outward, thereby causing the inner oil tank (8) to draw a portion of oil from the power oil supply main pipe (4) for storage, thus completing the potential energy storage stage. S2. Kinetic energy release: When the oil pump (2) outputs oil and the cylinder (2) extends its rod, the piston inside the cylinder (2) moves upward, causing the upper oil passage connecting pipe (33) to deliver industrial oil to the potential energy recovery tank (3). As a result, the amount of oil in the potential energy recovery tank (3) increases, and the increased oil volume forces the high-pressure air bag (7) to contract inward to adapt to the increase in oil volume. At this time, the inner oil bladder (8) rapidly releases and outputs the internal stored oil under the dual pressure of the potential energy pressure of the high-pressure gas and the increase in oil volume. This causes a portion of the oil output from the power oil supply main pipe (4) to the cylinder (2) to be output from the potential energy recovery oil pipe (5), reducing the kinetic energy output of the oil pump (2).

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