Gravity energy storage system based on weight fixation

Abstract

The invention relates to a gravity energy storage system based on heavy object fixing, which comprises a plurality of shaft structures arranged at intervals, a plurality of heavy objects and a lifting mechanism, and is characterized in that the lifting mechanism is used for transporting the plurality of heavy objects in the plurality of shaft structures arranged at intervals; the device further comprises a weight fixing assembly and a second power generation motor, the weight fixing assembly is used for fixing a weight and comprises a bidirectional driving part fixed to the outer wall of the vertical shaft structure, the bidirectional driving part is in transmission connection with an angle steel assembly, and the outer wall of the vertical shaft structure is further provided with a locking part. The locking part is used for supporting the angle steel assembly at the bottom of a heavy object; the lifting mechanism is in transmission connection with the second power generation motor and drives the second power generation motor to generate power, a heavy object can be supported and fixed, and the load of the lifting mechanism is reduced; and the problem that the service life of the device is shortened due to the fact that a counter weight generates large impact on the well body can be solved.

Description

Technical Field

[0001] The invention relates to a gravity energy storage system based on heavy object fixation, belonging to the technical field of energy storage systems. Background Art

[0002] Gravity energy storage is based on the height difference of the structure. It uses surplus electricity to lift heavy objects to a certain height to realize the conversion of electrical energy into gravitational potential energy. It is also called the energy storage process. During the falling process of the heavy object, the transmission mechanism drives the generator to generate electricity, realizing the conversion of gravitational potential energy into electrical energy, which is also called the discharge process.

[0003] Among them, after the heavy objects are lifted to the top of the structure or dropped to the bottom, they need to be temporarily stored at the corresponding location for a period of time. After the existing vertical gravity energy storage device transports the heavy objects to the top or bottom, it is necessary to use an overload AGV or other heavy object handling equipment to move the heavy objects to the corresponding storage platform. However, the above method has the disadvantages of large mechanical equipment investment, many failure points, and large floor space. At the same time, the operation of the handling equipment also consumes a lot of electricity and other energy. If the translation step and the storage platform are directly omitted, the heavy objects are always hoisted on the lifting equipment, which will shorten the life of the equipment and affect safety and stability.

[0004] The patent with application number "CN202211622875.6" provides a gravity energy storage power generation device. The device improves the efficiency of gravity energy storage and power generation and reduces the power consumption of the power station during energy storage by setting a counterweight whose weight can be flexibly changed in the vertical shaft. However, the device does not restrict the counterweight when releasing it. When the counterweight descends to the bottom of the vertical shaft, it will have a large impact on the counterweight and the shaft body, causing damage to the device mechanisms such as the counterweight and the shaft body, thereby reducing the service life of the device and increasing maintenance costs. Summary of the invention

[0005] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a gravity energy storage system based on the fixation of heavy objects, which can support and fix the heavy objects and reduce the load of the lifting mechanism; it can also solve the problem that the counterweight objects have a large impact on the well body, thereby reducing the service life of the device.

[0006] The technical solution of the present invention is as follows:

[0007] A gravity energy storage system based on the fixation of heavy objects comprises a plurality of shaft structures arranged at intervals, a plurality of heavy objects and a lifting mechanism, wherein the lifting mechanism is used to transport the plurality of heavy objects respectively in the plurality of shaft structures arranged at intervals; the system also comprises a heavy object fixing assembly and a second generator motor, wherein the heavy object fixing assembly is used to fix the heavy objects, the heavy object fixing assembly comprises a bidirectional driving part fixed to the outer wall of the shaft structure, the bidirectional driving part is transmission-connected with an angle steel assembly, the outer wall of the shaft structure is also provided with a locking part, the locking part is used to support the angle steel assembly at the bottom of the heavy object; the lifting mechanism is transmission-connected with the second generator motor and drives the second generator motor to generate electricity.

[0008] Wherein, the shaft structure comprises a top fixed frame, a transport frame and a bottom fixed frame which are arranged in sequence from top to bottom; the heavy object fixing assembly is installed on the top fixed frame.

[0009] Among them, the angle steel assembly includes a supporting plate and a limiting plate, the supporting plate and the limiting plate are fixedly connected by a hinge shaft, and the supporting plate and the limiting plate are connected to form an L shape; one end of the hinge shaft is rotatably connected to the inner side wall of the top fixed frame, and the other end of the hinge shaft is transmission connected to the bidirectional driving part.

[0010] Among them, the bidirectional driving unit includes a first bidirectional hydraulic pump and a second bidirectional hydraulic pump, the rotating shaft of the first bidirectional hydraulic pump is coaxially fixedly connected with the articulated shaft, the rotating shaft of the second bidirectional hydraulic pump is coaxially fixedly connected with the rotating shaft of the first generator motor, and the liquid inlet and liquid outlet of the first bidirectional hydraulic pump are connected to the liquid inlet and liquid outlet of the second bidirectional hydraulic pump through hydraulic oil pipes respectively.

[0011] Among them, the locking part includes a first fixed plate and a second fixed plate fixedly connected to the top fixed frame, and the first fixed plate and the second fixed plate are vertically arranged, the angle steel assembly is located between the first fixed plate and the second fixed plate, a stop bar is horizontally slidably connected to the first fixed plate, a through groove is opened on the side wall of the second fixed plate, and the stop bar is correspondingly arranged to the through groove; a moving part is arranged between the stop bar and the top fixed frame, and the stop bar slides horizontally on the first fixed plate through the moving part.

[0012] The moving part includes a rotating motor fixedly connected to the top fixed frame and a first rack fixedly connected to the side wall of the stop bar. A first gear is fixedly sleeved on the transmission shaft of the rotating motor, and the first gear is meshed with the first rack.

[0013] Among them, the lifting mechanism includes two groups of guide rails vertically arranged on the inner wall of the shaft structure, and sliders are slidably connected in the two guide rails respectively. The sliders are fixedly connected to the side walls of the weight, and two groups of winch units are arranged at the bottom of the shaft structure, and the winch units are used to drive the sliders to move up and down in the guide rails; a connecting rod is fixedly connected to the side of the slider close to the weight, and a groove is provided on the side wall of the weight close to the slider, and a plurality of springs are fixedly connected to the top and bottom of one end of the connecting rod away from the slider, and the ends of the plurality of springs away from the connecting rod are fixedly connected to the top and bottom of the groove.

[0014] Among them, a second gear is fixedly provided on the output shaft of the winch unit, and the second generator motor is connected to the second gear transmission through a driving switching member; the driving switching member includes a driving rod coaxially rotatably connected to the output shaft of the second generator motor, and a plurality of splines are spaced apart on the driving rod, and a plurality of spline sleeves are slidably connected to the driving rod, and the plurality of spline sleeves are respectively adapted to the plurality of splines, and a plurality of spline sleeves are respectively fixedly provided with gear rings, and the plurality of gear rings are respectively arranged corresponding to the plurality of second gears; a plurality of driving members are also provided, and the second movable member is used to drive the corresponding spline sleeves to engage with the corresponding splines, one end of the shaft sleeve is rotatably connected to the end of the spline sleeve away from the corresponding spline, and a second rack is fixedly connected to the shaft sleeve, and a second motor is also included, and a third gear is fixedly provided on the output shaft of the second motor, and the third gear is meshed with the second rack.

[0015] Among them, it also includes a slow-descent structure, which includes a spiral groove arranged at the bottom end of the guide rail, and the slider matches the spiral groove; a pulling column is rotatably arranged on the top of the weight, and the pulling column is connected to the pull rope of the winch unit; a rubber pad is fixedly connected to the bottom of the weight.

[0016] Among them, the vertical shaft structure includes an inner shell and an outer shell, the guide rail is arranged on the inner shell, and a push rod is slidingly arranged between the inner shell and the outer shell, the outer wall of the slider is provided with teeth, the inner wall of the push rod is provided with teeth matching the teeth, the teeth of the slider extend beyond the spiral groove and mesh with the teeth of the push rod; the top ends of several of the push rods are hinged with fan-shaped plates, the bottom surfaces of the fan-shaped plates mesh with the top end of the inner shell, several of the fan-shaped plates are spliced ​​to form a circular plate, and the pull rope slides through the middle of the circular plate.

[0017] The present invention has the following beneficial effects:

[0018] The present invention omits the step of horizontally transporting heavy objects in conventional vertical gravity energy storage technology by always keeping the heavy objects in the vertical transport channel, which can save the investment in the construction of horizontal heavy object transport equipment and storage platform, reduce the overall footprint of the energy storage equipment, shorten the switching time of charging and discharging states, improve the overall efficiency of the energy storage system, save project investment, and reduce the pressure on project land use.

[0019] The present invention adopts a weight fixing assembly to support and fix the weight running to the top or bottom, thereby reducing the load of the lifting mechanism, thereby reducing the influence of the weight on the life of the lifting mechanism and improving the stability and safety of the overall device.

[0020] In the present invention, the first generator motor, the second generator motor and the weight can be quickly connected by a driving switch, so that the weights can be quickly raised and lowered during the charging and discharging stages, thereby improving system efficiency.

[0021] The present invention uses a slow-down component to initially slow down the weight through a spiral groove, and then drives the fan-shaped plate to clamp the pull rope through a push rod, thereby slowing down the weight again, reducing the impact of the weight on the shaft structure, and thus protecting the weight and the shaft structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a general schematic diagram of the present invention;

[0023] Figure 2 It is a schematic diagram of a heavy object and a heavy object transport assembly of the present invention;

[0024] Figure 3 It is a schematic diagram of a heavy object fixing assembly of the present invention;

[0025] Figure 4 This is a schematic diagram of the angle steel assembly of the present invention;

[0026] Figure 5 It is a schematic diagram of the bidirectional driving part of the present invention;

[0027] Figure 6 This is a schematic diagram of a drive switching member of the present invention;

[0028] Figure 7 It is a half-section diagram of the slow-descent structure of the present invention;

[0029] Figure 8 It is a top view of the circular plate of the present invention.

[0030] The reference numerals in the figure are as follows:

[0031] 1. Top fixed frame; 2. Bottom fixed frame; 3. Transport frame; 4. Guide rail; 5. Slider; 6. Weight; 7. Connecting rod; 8. Spring; 9. Groove; 10. Rubber pad; 11. Limit plate; 12. Support plate; 13. First bidirectional hydraulic pump; 14. Second bidirectional hydraulic pump; 15. Hydraulic oil storage tank; 16. First generator motor; 17. First fixed plate; 18. Second fixed plate; 19. Through groove; 20. Baffle bar; 21. First A rack; 22, a first gear; 23, a first motor; 24, a second generator motor; 25, a winch unit; 26, a second gear; 27, a gear ring; 28, a spline sleeve; 29, a driving rod; 30, a second rack; 31, a second motor; 32, a hinge shaft; 33, a bushing; 34, a third gear; 35, a two-way driving unit; 36, a spiral groove; 37, a pulling column; 38, an inner shell; 39, an outer shell; 40, a pushing rod; 41, a fan-shaped plate. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] See also Figures 1 to 8 , the invention provides a technical solution:

[0034] A gravity energy storage system based on the fixation of heavy objects, comprising a plurality of shaft structures arranged at intervals, a plurality of heavy objects 6 and a lifting mechanism, wherein the lifting mechanism is used to transport the plurality of heavy objects 6 in the plurality of shaft structures arranged at intervals; further comprising a heavy object fixing assembly and a second generator motor 24, wherein the heavy object fixing assembly is used to fix the heavy object 6, and the heavy object fixing assembly comprises a bidirectional driving part 35 fixed to the outer wall of the shaft structure, wherein the bidirectional driving part 35 is transmission-connected with an angle steel assembly, and a locking part is further provided on the outer wall of the shaft structure, wherein the locking part is used to support the angle steel assembly at the bottom of the heavy object 6; the lifting mechanism is transmission-connected with the second generator motor 24 and drives the second generator motor 24 to generate electricity; the main function of the lifting mechanism is to lift and lower the heavy object 6;

[0035] Specifically, the shaft structure includes a top fixed frame 1, a transport frame 3 and a bottom fixed frame 2 which are arranged in sequence from top to bottom; the weight fixing assembly is installed on the top fixed frame 1; the main function of the transport frame 3 is to limit and protect the up and down transportation of the weight 6; the bottom fixed frame 2 is used to temporarily store the weight 6 during the energy release stage.

[0036] The angle steel assembly includes a supporting plate 12 and a limiting plate 11, and the supporting plate 12 and the limiting plate 11 are fixedly connected by a hinge shaft 32, and the supporting plate 12 and the limiting plate 11 are connected to form an L shape; one end of the hinge shaft 32 is rotatably connected to the inner side wall of the top fixed frame 1, and the other end of the hinge shaft 32 is transmission-connected to the bidirectional driving part 35; the main function of the angle steel assembly is to support the bottom of the heavy object 6 after the heavy object 6 is transported to a high place, so as to reduce the load of the lifting mechanism;

[0037] The bidirectional driving part 35 comprises a first bidirectional hydraulic pump 13 and a second bidirectional hydraulic pump 14, the rotating shaft of the first bidirectional hydraulic pump 13 is coaxially fixedly connected with the hinge shaft 32, the rotating shaft of the second bidirectional hydraulic pump 14 is coaxially fixedly connected with the rotating shaft of the first generator motor 16, and the liquid inlet and liquid outlet of the first bidirectional hydraulic pump 13 are respectively connected with the liquid inlet and liquid outlet of the second bidirectional hydraulic pump 14 through hydraulic oil pipes; the main function of the bidirectional driving part 35 is to support the angle steel assembly under the weight 6 through the drive of the first generator motor 16 in the supporting stage, and to drive the first generator motor 16 to operate through the weight 6 in the releasing stage, so as to convert the potential energy into electrical energy;

[0038] The locking portion includes a first fixing plate 17 and a second fixing plate 18 fixedly connected to the top fixing frame 1, and the first fixing plate 17 and the second fixing plate 18 are vertically arranged, and the angle steel assembly is located between the first fixing plate 17 and the second fixing plate 18, and a stop bar 20 is horizontally slidably connected to the first fixing plate 17, and a through groove 19 is opened on the side wall of the second fixing plate 18, and the stop bar 20 is arranged corresponding to the through groove 19; a moving part is arranged between the stop bar 20 and the top fixing frame 1, and the stop bar 20 slides horizontally on the first fixing plate 17 through the moving part; when the stop bar 20 slides into the through groove 19, the limit plate 11 is fitted with the stop bar 20, and the stop bar 20 can prevent the limit plate 11 from rotating outward, thereby avoiding the support plate 12 from rotating downward, so that the support plate 12 can reliably lift the heavy object 6; the main function of the locking portion is to lock the position of the angle steel assembly to prevent the angle steel assembly from shifting during the process of supporting the heavy object 6 and causing the support to fail.

[0039] According to the gravity energy storage system based on the fixation of heavy objects as claimed in claim 5, the moving part includes a rotating motor 23 fixedly connected to the top fixed frame 1 and a first rack 21 fixedly connected to the side wall of the gear bar 20, and a first gear 22 is fixedly sleeved on the transmission shaft of the rotating motor 23, and the first gear 22 is meshed with the first rack 21.

[0040] The lifting mechanism includes two groups of guide rails 4 vertically arranged on the inner wall of the shaft structure, and sliders 5 are respectively slidably connected in the two guide rails 4. The sliders 5 are fixedly connected to the side walls of the weight 6. Two groups of hoisting units 25 are arranged at the bottom of the shaft structure, and the hoisting unit 25 is used to drive the slider 5 to move up and down in the guide rails 4; a connecting rod 7 is fixedly connected to the side of the slider 5 close to the weight 6, and a groove 9 is provided on the side wall of the weight 6 close to the slider 5. The top and bottom of the end of the connecting rod 7 away from the slider 5 are respectively fixedly connected with a plurality of springs 8, and the ends of the plurality of springs 8 away from the connecting rod 7 are respectively fixedly connected to the top and bottom of the groove 9; by arranging a plurality of springs 8, the impact of the weight 6 on the slider 5 and the guide rail 4 during the lifting and lowering process can be buffered. At the same time, in the energy release and discharge stage, when the weight 6 is released, the buffering of the spring 8 can prevent the gravity of the weight 6 from being suddenly applied to the slider 5, thereby reducing the impact on the device. A rubber pad 10 is fixedly connected to the bottom of the weight 6, which can cushion the impact that may be caused by the weight 6 falling to the bottom; a connecting rod 7 is fixedly connected to the side of the slider 5 close to the weight 6, and a groove 9 is provided on the side wall of the weight 6 close to the slider 5. The top and bottom of the end of the connecting rod 7 away from the slider 5 are respectively fixedly connected to a number of springs 8, and the ends of the several springs 8 away from the connecting rod 7 are respectively fixedly connected to the top and bottom of the groove 9.

[0041] A second gear 26 is fixedly sleeved on the output shaft of the hoisting unit 25, and the second generator motor 24 is transmission-connected to the second gear 26 through a driving switching member. The main function of the driving switching member is to make the lifting mechanism that needs to be operated transmission-connected to the second generator motor 24. In the energy storage stage, the second generator motor 24 drives the corresponding lifting mechanism to transport the weight 6 to the top of the transport frame 3, and converts the electrical energy into potential energy. When power generation is required, the gravity of the weight 6 is used to drive the lifting mechanism to operate, thereby driving the second generator motor 24 to generate electricity; the driving switching member includes a driving rod 29 that is coaxially rotatably connected to the output shaft of the second generator motor 24, and a plurality of splines are spaced apart on the driving rod 29. A plurality of spline sleeves 28 are slidably connected to the driving rod 29, and the plurality of spline sleeves 28 are respectively adapted to the plurality of splines. A plurality of spline sleeves 28 are respectively fixedly sleeved with gear rings 27, and the plurality of gear rings 27 are respectively arranged corresponding to the plurality of second gears 26; a plurality of driving members are also provided, and the second movable member is used to drive the corresponding spline sleeves 28 to engage with the corresponding splines. The driving member includes a shaft sleeve 33 slidably connected to the driving rod 29, and one end of the shaft sleeve 33 is rotatably connected to the end of the spline sleeve 28 away from the corresponding spline. A second rack 30 is fixedly connected to the shaft sleeve 33, and also includes a second motor 31. A third gear 34 is fixedly sleeved on the output shaft of the second motor 31, and the third gear 34 is meshed with the second rack 30.

[0042] As a preferred embodiment, a slow-down structure is also included, the top and bottom ends of the guide rail 4 are respectively located at the top of the top fixed frame 1 and the bottom of the bottom fixed frame 2, the slow-down structure includes a spiral groove 36 arranged at the bottom end of the guide rail 4, and the slider 5 matches the spiral groove 36; the top of the weight 6 is rotatably provided with a pulling column 37, and the pulling column 37 is connected to the pull rope of the winch unit 25; the bottom of the weight 6 is fixedly connected with a rubber pad 10; the shaft structure includes an inner shell 38 and an outer shell 39, the guide rail 4 is arranged on the inner shell 38, and the inner shell 38 and the outer shell A push rod 40 is slidably arranged between the slider 5 and the inner wall of the push rod 40, and teeth are arranged on the outer wall of the slider 5, and teeth matching the teeth are arranged on the inner wall of the push rod 40, and the teeth of the slider 5 exceed the spiral groove 36 and mesh with the teeth of the push rod 40; the top ends of the plurality of push rods 40 are hinged with a fan-shaped plate 41, and the bottom surface of the fan-shaped plate 41 meshes with the top end of the inner shell 38, and the plurality of fan-shaped plates 41 are spliced ​​to form a circular plate, and a circular hole is arranged at the center of the circular plate, and the front ends of the plurality of fan-shaped plates 41 are rotatably connected to each other, and the pull rope slides through the central circular hole of the circular plate;

[0043] When the weight 6 descends, the slider 5 slides down along the guide rail 4 until it connects with the top of the spiral groove 36, thereby reducing the impact of the weight 6 on the shaft structure, and then the weight 6 rotates and descends along the spiral groove 36; thereby reducing the descending speed of the weight 6. At the same time, in the process of rotating and descending along the spiral groove 36, the teeth of the slider 5 exceeding the spiral groove 36 mesh with the teeth of the push rod 40 and drive the push rod 40 to drive upward, and then the push rod 40 props up the fan-shaped plate 41, and several upwardly rising fan-shaped plates 41 will drive the front ends of several fan-shaped plates 41 to be squeezed toward the center, and because the front ends of several fan-shaped plates 41 are rotatably connected to each other, after several fan-shaped plates 41 are tilted at the end, the front ends are squeezed downward, and then the pull rope is clamped, which can further reduce the speed of the weight 6 and avoid causing a huge impact on the shaft structure.

[0044] The working principle of the above-mentioned gravity energy storage system based on fixed weight is as follows:

[0045] In the energy storage stage, when the weight 6 is lifted by the lifting mechanism into the top fixed frame 1 and is above the supporting plate 12, the first generator motor 16 rotates, driving the second bidirectional hydraulic pump 14 to drive the first bidirectional hydraulic pump 13 to operate, so that the first bidirectional hydraulic pump 13 drives the hinge shaft 32 to rotate, thereby causing the supporting plate 12 to rotate to the bottom of the weight 6, fit with the bottom of the weight 6, and the weight is fixed.

[0046] During the energy release and discharge phase, the weight 6 will press down the support plate 12 when it descends, and the first motor 23 will reverse, so that the stop bar 20 will exit the through slot 19 and disengage from the limit plate 11, thereby ensuring the smooth rotation of the support plate 12. The support plate 12 drives the hinge shaft 32 to rotate, thereby driving the first bidirectional hydraulic pump 13 to rotate, the first bidirectional hydraulic pump 13 drives the second bidirectional hydraulic pump 14 to rotate, and finally drives the first generator motor 16 to operate and generate electricity. At the same time, during the descent of the weight 6, the corresponding hoisting unit 25 will be driven to rotate, driving the second generator motor 24 to rotate and generate electricity.

[0047] like Figure 6 As shown, the hoisting unit 25 is fixedly connected to the ground, and a corresponding pulley block is arranged in the guide rail 4, so that the hoisting unit 25 can drive the slider 5 to move up and down in the guide rail 4. The pulley block is conventionally arranged, and its structure and working process are not described in detail.

[0048] This solution can be further optimized:

[0049] A sliding member (not shown) is provided between the shaft sleeve 33 and the bottom fixed frame 2. The sliding member can be a conventional structure such as a linear guide rail. The sliding member can ensure that the shaft sleeve 33 only moves along the axis direction of the driving rod 29 and does not rotate. The driving rod 29 is rotatably connected to the ground or the bottom fixed frame 2 through a bearing seat.

[0050] A control unit (not shown in the figure) is added, and the operator can control the working states of the first generator motor 16, the first motor 23, the second generator motor 24 and the second motor 31 through the control unit.

[0051] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A gravity energy storage system based on the fixing of a weight, comprising a plurality of vertical shaft structures arranged at intervals, a plurality of weights (6) and a lifting mechanism, characterized in that: The lifting mechanism is used to transport a plurality of heavy objects (6) in a plurality of spaced-apart vertical shaft structures; it also includes a heavy object fixing assembly and a second generator motor (24); the heavy object fixing assembly is used to fix the heavy object (6); the heavy object fixing assembly includes a bidirectional driving portion (35) fixed to the outer wall of the vertical shaft structure; the bidirectional driving portion (35) is transmission-connected to an angle steel assembly; the outer wall of the vertical shaft structure is also provided with a locking portion, the locking portion being used to support the angle steel assembly at the bottom of the heavy object (6); the lifting mechanism is transmission-connected to the second generator motor (24) and drives the second generator motor (24) to generate electricity.

2. A gravity energy storage system based on weight fixation as claimed in claim 1, characterized in that: The shaft structure comprises a top fixed frame (1), a transport frame (3) and a bottom fixed frame (2) which are arranged in sequence from top to bottom; the heavy object fixing assembly is installed on the top fixed frame (1).

3. A gravity energy storage system based on weight fixation as claimed in claim 2, characterized in that: The angle steel assembly comprises a supporting plate (12) and a limiting plate (11), wherein the supporting plate (12) and the limiting plate (11) are fixedly connected via a hinge shaft (32), and the supporting plate (12) and the limiting plate (11) are connected to form an L shape; one end of the hinge shaft (32) is rotatably connected to the inner side wall of the top fixed frame (1), and the other end of the hinge shaft (32) is transmission-connected to a bidirectional driving unit (35).

4. A gravity energy storage system based on weight fixation as claimed in claim 3, characterized in that: The bidirectional driving unit (35) comprises a first bidirectional hydraulic pump (13) and a second bidirectional hydraulic pump (14); the rotating shaft of the first bidirectional hydraulic pump (13) is coaxially fixedly connected to the articulated shaft (32); the rotating shaft of the second bidirectional hydraulic pump (14) is coaxially fixedly connected to the rotating shaft of the first generator motor (16); the liquid inlet and liquid outlet of the first bidirectional hydraulic pump (13) are connected to the liquid inlet and liquid outlet of the second bidirectional hydraulic pump (14) through hydraulic oil pipes, respectively.

5. A gravity energy storage system based on weight fixation as claimed in claim 4, characterized in that: The locking portion comprises a first fixing plate (17) and a second fixing plate (18) fixedly connected to the top fixing frame (1), and the first fixing plate (17) and the second fixing plate (18) are arranged vertically, the angle steel assembly is located between the first fixing plate (17) and the second fixing plate (18), a stop bar (20) is horizontally slidably connected to the first fixing plate (17), a through groove (19) is provided on the side wall of the second fixing plate (18), and the stop bar (20) and the through groove (19) are arranged correspondingly; a moving part is arranged between the stop bar (20) and the top fixing frame (1), and the stop bar (20) slides horizontally on the first fixing plate (17) through the moving part.

6. A gravity energy storage system based on weight fixation as claimed in claim 5, characterized in that: The moving part comprises a rotating motor (23) fixedly connected to the top fixed frame (1) and a first rack (21) fixedly connected to the side wall of the stop bar (20); a first gear (22) is fixedly sleeved on the transmission shaft of the rotating motor (23); and the first gear (22) is meshed with the first rack (21).

7. A gravity energy storage system based on weight fixation as claimed in claim 6, characterized in that: The lifting mechanism comprises two groups of guide rails (4) vertically arranged on the inner wall of the shaft structure, and sliders (5) are slidably connected in the two guide rails (4), and the sliders (5) are fixedly connected to the side walls of the weight (6). Two groups of hoisting units (25) are arranged at the bottom of the shaft structure, and the hoisting units (25) are used to drive the sliders (5) to move up and down in the guide rails (4); a connecting rod (7) is fixedly connected to the side of the slider (5) close to the weight (6), and a groove (9) is provided on the side wall of the weight (6) close to the slider (5); a plurality of springs (8) are fixedly connected to the top and bottom of one end of the connecting rod (7) away from the slider (5), and the ends of the plurality of springs (8) away from the connecting rod (7) are fixedly connected to the top and bottom of the groove (9).

8. A gravity energy storage system based on weight fixation as claimed in claim 7, characterized in that: The output shaft of the hoisting unit (25) is fixedly sleeved with a second gear (26), and the second generator motor (24) is transmission-connected to the second gear (26) via a drive switching member; the drive switching member comprises a drive rod (29) coaxially rotatably connected to the output shaft of the second generator motor (24), a plurality of splines are arranged at intervals on the drive rod (29), a plurality of spline sleeves (28) are slidably connected to the drive rod (29), the plurality of spline sleeves (28) are respectively matched with the plurality of splines, and a plurality of spline sleeves (28) are respectively fixedly sleeved with gear rings (27), and the plurality of gear rings (27) are ) are respectively arranged corresponding to a plurality of second gears (26); a plurality of driving members are also arranged, the second moving member is used to drive the corresponding spline sleeve (28) to engage with the corresponding spline, the driving member includes a sleeve (33) slidably connected to the driving rod (29), one end of the sleeve (33) is rotatably connected to the end of the spline sleeve (28) away from the corresponding spline, the sleeve (33) is fixedly connected with a second rack (30), and also includes a second motor (31), the output shaft of the second motor (31) is fixedly sleeved with a third gear (34), and the third gear (34) is engaged with the second rack (30).

9. A gravity energy storage system based on weight fixation as claimed in claim 8, characterized in that: It also includes a slow-descent structure, which includes a spiral groove (36) arranged at the bottom end of the guide rail (4), and the slider (5) matches the spiral groove (36); a pulling column (37) is rotatably arranged at the top end of the weight (6), and the pulling column (37) is connected to the pull rope of the winch unit (25); and a rubber pad (10) is fixedly connected to the bottom of the weight (6).

10. A gravity energy storage system based on weight fixation as claimed in claim 9, characterized in that: The shaft structure comprises an inner shell (38) and an outer shell (39), the guide rail (4) is arranged on the inner shell (38), and a push rod (40) is arranged between the inner shell (38) and the outer shell (39) for sliding. The outer wall of the slider (5) is provided with teeth, and the inner wall of the push rod (40) is provided with teeth matching the teeth. The teeth of the slider (5) extend beyond the spiral groove (36) and mesh with the teeth of the push rod (40); the top ends of several push rods (40) are hinged with fan-shaped plates (41), the bottom surface of the fan-shaped plates (41) meshes with the top end of the inner shell (38), and several fan-shaped plates (41) are spliced ​​to form a circular plate, and the pull rope slides through the middle of the circular plate.

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