Slow release device and gravity energy storage system

Abstract

The invention belongs to the technical field of energy power generation, and discloses a slow release device and a gravity energy storage system. The slow release device comprises a supporting structure, a first slow release part, a second slow release part and an elastic energy storage structure, the second slow release part is provided with a first position spaced from the traction rope and a second position abutting against the traction rope, the elastic energy storage structure comprises a driving assembly and an elastic piece, and the second end of the driving assembly can abut against the traction rope. The elastic piece is in an energy storage state, and the driving assembly can limit the second slow release part to the first position. When the traction rope works normally, the traction rope abuts against the second end of the driving assembly to enable the elastic piece to store energy, meanwhile, the driving assembly limits the second slow-release part to the first position, the second slow-release part and the traction rope are arranged in a spaced mode, normal movement of the traction rope is prevented from being affected, and after the traction rope loses efficacy and is broken, the elastic piece releases energy to enable limiting of the driving assembly and the second slow-release part to be relieved. The second slow release part can be switched to the second position to abut against the traction rope, and the heavy object unit is prevented from falling rapidly.

Description

Technical Field

[0001] The present invention relates to the technical field of energy generation, and in particular to a slow-release device and a gravity energy storage system. Background Art

[0002] Gravity energy storage is a storage method that achieves energy storage and release through the conversion of gravitational potential energy and electrical energy. Specifically, it uses the height difference to cooperate with electromechanical equipment to achieve the lifting or lowering of the energy storage block to achieve energy storage and conversion. It is a highly sustainable innovative form of energy storage with the advantages of long discharge time, long cycle life, strong environmental adaptability and high safety. When the electricity generated by new energy is surplus, the surplus electricity is used to lift the energy storage block for "charging", and the gravitational potential energy is stored by raising the height of the heavy unit. When the power consumption is at its peak, the system lowers the energy storage block and uses gravity to do work to "discharge", converting the gravitational potential energy into electrical energy for release. In order to increase the total energy storage of the gravity energy storage system, there are usually multiple energy storage blocks, and the multiple energy storage blocks are connected in turn by traction ropes. When the gravity energy storage system has been running for too long, the traction rope will age and it is very easy to fail and break during the lifting and lowering of the energy storage block, causing all the energy storage blocks to fall, resulting in serious damage to the entire gravity energy storage system.

[0003] Therefore, a slow-release device and a gravity energy storage system are needed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a slow-release device and a gravity energy storage system, which can slow down the descent speed of the energy storage blocks when the traction rope fails, thereby preventing all the energy storage blocks from falling at a rapid speed, thereby preventing the remaining traction ropes from breaking due to excessive load, and thereby reducing damage to the gravity energy storage system.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A sustained-release device, comprising:

[0007] Support structure;

[0008] a first slow-release portion and a second slow-release portion, wherein the first slow-release portion is fixedly disposed on the support structure, and the second slow-release portion is rotatably disposed on the support structure, the first slow-release portion and the second slow-release portion are spaced apart to form a passage for passing a traction rope, the first slow-release portion abuts against the traction rope, and the second slow-release portion has a first position spaced apart from the traction rope and a second position abutting against the traction rope;

[0009] An elastic energy storage structure, wherein the elastic energy storage structure comprises a driving component and an elastic member, wherein a first end of the driving component is arranged on the supporting structure, one end of the elastic member is fixedly arranged, and the other end of the elastic member is connected to the driving component, and a second end of the driving component can abut against the traction rope to put the elastic member in an energy storage state; when the elastic member is in the energy storage state, the driving component can limit the second release portion to the first position, and when the elastic member releases energy, the driving component and the second release portion are released from the limit, and the second release portion can be switched to the second position.

[0010] As an optional technical solution, two of the first release portion, the second release portion, and the drive assembly are each provided, the two first release portions are spaced apart on the support structure, the two second release portions are spaced apart between the two first release portions, and the two second release portions have opposite rotation directions when switching from the first position to the second position; the drive assembly and the two second release portions can be limited one by one, and the elastic member is connected between the two drive assemblies.

[0011] As an optional technical solution, the driving assembly includes an abutment member and two driving rods, the two driving rods are arranged in parallel and at intervals, and the first ends of the two driving rods are rotatably set on the supporting structure, the abutment member is set at the second ends of the two driving rods, and the abutment member is located between the two driving rods, and the abutment member is used to abut against the traction rope.

[0012] As an optional technical solution, the abutment member is rotatably disposed on the driving rod.

[0013] As an optional technical solution, the abutment member is provided with an abutment groove, and the abutment groove is used to accommodate the traction rope.

[0014] As an optional technical solution, the second release portion is a cam, and the cam is rotatably disposed on the support structure via a rotating shaft. The drive rod is provided with a slot, and when the cam is in the first position, the slot is engaged with the cam.

[0015] As an optional technical solution, the first release portion is provided with a groove, and the groove is used to accommodate the traction rope.

[0016] As an optional technical solution, an anti-slip layer is provided on the periphery of the second slow-release portion.

[0017] The present invention adopts the following technical solutions:

[0018] A gravity energy storage system, the gravity energy storage system includes a load-bearing unit, a weight unit and a traction rope, the gravity energy storage system also includes the slow-release device as described above, the weight unit is height-adjustably arranged on the load-bearing unit through the traction rope, at least one of the slow-release devices is installed on the load-bearing unit, the traction rope is passed between the first slow-release portion and the second slow-release portion, and the traction rope can stop the elastic member in the energy storage state.

[0019] As an optional technical solution, the load-bearing unit includes a support frame, and the slow-release device also includes a fixing plate, the fixing plate is fixedly connected to the support structure, and the fixing plate is locked to the support frame by a locking member.

[0020] Beneficial effects of the present invention:

[0021] The present invention discloses a slow-release device, which comprises a supporting structure, a first slow-release portion, a second slow-release portion and an elastic energy storage structure. The first slow-release portion and the second slow-release portion form a channel for passing a traction rope. The second slow-release portion has a first position spaced from the traction rope and a second position abutting against the traction rope. The elastic energy storage structure comprises a driving component and an elastic member. The first end of the driving component is arranged on the supporting structure, one end of the elastic member is fixedly arranged, and the other end of the elastic member is connected to the driving component. The second end of the driving component can abut against the traction rope to put the elastic member in an energy storage state. When the elastic member is in the energy storage state, the driving component can limit the second slow-release portion to the first position. When the elastic member releases energy, the driving component and the second slow-release portion are released from the limit, and the second slow-release portion can be switched to the second position. When the traction rope normally carries the heavy unit, the traction rope is subjected to tension, and the traction rope abuts against the second end of the driving assembly, thereby causing the elastic member to store energy. At the same time, the driving assembly limits the second release portion so that the second release portion is in the first position. At this time, the second release portion and the traction rope are spaced apart to avoid affecting the normal movement of the traction rope. When the traction rope fails and breaks, the force applied by the traction rope to the second end of the driving assembly disappears, and the elastic member releases energy, so that the limit between the driving assembly and the second release portion is released, and the second release portion can be switched to the second position and abut against the traction rope, thereby increasing the friction force on the traction rope and applying a clamping force to the traction rope. In addition, the second end of the driving assembly changes the moving direction of the traction rope, further hindering the movement of the traction rope and preventing the heavy unit from falling rapidly, thereby reducing damage to the entire gravity energy storage system.

[0022] The present invention also discloses a gravity energy storage system, which includes a load-bearing unit, a weight unit and a traction rope, wherein the weight unit is arranged on the load-bearing unit in an adjustable height through the traction rope, and the gravity energy storage system further includes the above-mentioned slow-release device, wherein at least one slow-release device is installed on the load-bearing unit, and the traction rope is inserted between the first slow-release portion and the second slow-release portion, and the traction rope can stop the elastic member in the energy storage state. This gravity energy storage system can effectively provide friction and clamping force to the traction rope when the traction rope fails and breaks by installing the slow-release device, so that the traction rope carrying the weight unit cannot fall rapidly without obstruction, thereby reducing the falling speed of all weight units, thereby avoiding causing greater damage to the entire gravity energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of a sustained-release device according to an embodiment of the present invention;

[0024] Figure 2 Schematic diagram of the structure of the sustained-release device according to an embodiment of the present invention.

[0025] In the figure:

[0026] 1. Support frame; 101. Fixed pulley; 2. Weight unit; 201. Moving pulley; 3. Traction rope;

[0027] 10. Support structure; 11. Support plate; 12. Fixing plate;

[0028] 20. a first sustained-release portion;

[0029] 30. second slow-release portion; 31. rotating shaft;

[0030] 40. Elastic energy storage structure; 41. Driving assembly; 411. Abutment member; 412. Driving rod; 42. Elastic member. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] like Figure 1 and Figure 2As shown, in this embodiment, a slow-release device is provided, which includes a support structure 10, a first slow-release portion 20, a second slow-release portion 30 and an elastic energy storage structure 40, wherein the first slow-release portion 20 is fixedly arranged on the support structure 10, the second slow-release portion 30 is rotatably arranged on the support structure 10, the second slow-release portion 30 and the first slow-release portion 20 form a channel for passing the traction rope 3, and the second slow-release portion 30 has a first position spaced from the traction rope 3 and a second position abutting against the traction rope 3, and the elastic energy storage structure 40 includes a drive assembly 4 1 and an elastic member 42, a first end of the driving assembly 41 is arranged on the supporting structure 10, one end of the elastic member 42 is fixedly arranged, the other end of the elastic member 42 is connected to the driving assembly 41, and the second end of the driving assembly 41 can abut against the traction rope 3 to make the elastic member 42 in an energy storage state; when the elastic member 42 is in the energy storage state, the driving assembly 41 can limit the second slow-release portion 30 to the first position, and when the elastic member 42 releases energy, the driving assembly 41 and the second slow-release portion 30 are released from the limit, and the second slow-release portion 30 can be switched to the second position. Specifically, in the present embodiment, in actual use, the traction rope 3 is usually in a tensioned state. At this time, the traction rope 3 can apply force to the second end of the driving component 41, so that the second end of the driving component 41 can drive the elastic member 42 to be in an energy storage state. At the same time, the driving component 41 can limit the second release portion 30 to the first position, and the second release portion 30 can be spaced apart from the traction rope 3 to prevent the second release portion 30 from affecting the normal movement of the traction rope 3. After the traction rope 3 fails and breaks, the traction rope 3 no longer applies force to the driving component 41, and the elastic member 42 is in an energy storage state. The energy release can drive the driving component 41 to move, thereby releasing the limit between the driving component 41 and the second release portion 30, and the second release portion 30 can be switched from the first position to the second position, so that the second release portion 30 can abut against the traction rope 3, thereby providing a certain friction force to the traction rope 3, and the second release portion 30 and the first release portion 20 can both abut against the traction rope 3, thereby providing a certain clamping force to the traction rope 3, thereby reducing the descending speed of the traction rope 3, thereby avoiding the rapid descent of the heavy unit 2 carried by the traction rope 3, and improving safety during use.

[0036] In this embodiment, the elastic member 42 is a spring. When the traction rope 3 is tensioned, a force is applied to the second end of the driving component 41, thereby causing the elastic member 42 to pull the rope. When the traction rope 3 fails and breaks, the force applied by the traction rope 3 to the second end of the driving component 41 disappears, and the driving component 41 rotates under the action of the restoring force of the spring, thereby releasing the limit of the second release portion 30.

[0037] Specifically, in this embodiment, the support structure 10 includes two support plates 11, the two support plates 11 are parallel and spaced apart, the first release portion 20 and the second release portion 30 are both disposed between the two support plates 11, and the first end of the drive assembly 41 is also rotatably disposed between the two support plates 11. This arrangement can have a certain limiting effect on the traction rope 3, which is used to avoid the traction rope 3 from dancing due to force changes when it fails and breaks, thereby ensuring safety in use.

[0038] Furthermore, two of the first slow-release portion 20, the second slow-release portion 30, and the driving assembly 41 are each provided, the two first slow-release portions 20 are arranged at intervals on the supporting structure 10, the two second slow-release portions 30 are arranged at intervals between the two first slow-release portions 20, and the two second slow-release portions 30 have opposite rotation directions when switching from the first position to the second position; the driving assembly 41 and the two second slow-release portions 30 can be limited one by one, and the elastic member 42 is connected between the two driving assemblies 41. Specifically, in the present embodiment, two first slow-release parts 20 and two second slow-release parts 30 are provided, and the two first slow-release parts 20 and the second slow-release parts 30 form two channels. Two driving components 41 are also provided, and the two driving components 41 are arranged in a one-to-one correspondence with the two second slow-release parts 30, and are used to limit the two second slow-release parts 30. The two ends of the spring are respectively connected to the two driving components 41. When the traction rope 3 is tensioned, the traction rope 3 can simultaneously provide force to the second ends of the two driving components 41, so that the second ends of the two driving components 41 are separated, and then the spring is stretched to ensure that when the traction rope 3 fails and breaks, the second ends of the two driving components 41 can approach each other under the action of the spring, so that the two second slow-release parts 30 can approach the two first slow-release parts 20 respectively, so as to have friction and apply clamping force on two places of the traction rope 3, thereby improving the slow-release effect of the traction rope 3 and ensuring safe use.

[0039] For further information, please refer to Figure 1The driving assembly 41 includes a contact piece 411 and two driving rods 412, the two driving rods 412 are arranged in parallel and at intervals, and the first ends of the two driving rods 412 are rotatably arranged on the supporting structure 10, the contact piece 411 is arranged at the second ends of the driving rods 412, and the contact piece 411 is located between the two driving rods 412, and the contact piece 411 is used to abut against the traction rope 3. Specifically, in this embodiment, the first ends of the two driving rods 412 are rotatably arranged on the supporting structure 10, the contact piece 411 is arranged at the second ends of the two driving rods 412, and is located between the two driving rods 412, the two driving rods 412, the contact piece 411 and the supporting structure 10 form a closed area, and the traction rope 3 is inserted into the closed area. When the traction rope 3 breaks, the traction rope 3 is restricted in the closed area, so that the activity space of the traction rope 3 is limited, thereby avoiding safety accidents, and when the traction rope 3 is tightened, it can ensure that the contact piece 411 can have a good abutment effect with the traction rope 3, thereby avoiding the position deviation of the traction rope 3.

[0040] Further, the abutment member 411 is rotatably arranged on the driving rod 412. Specifically, in this embodiment, this arrangement can reduce the friction between the abutment member 411 and the traction rope 3, ensuring that the traction rope 3 is subjected to less friction from the abutment member 411 when it is tensioned and in working state, thereby avoiding wear on the traction rope 3.

[0041] Furthermore, the abutment member 411 is provided with an abutment groove, and the abutment groove is used to accommodate the traction rope 3. Specifically, in this embodiment, this arrangement can ensure that the abutment member 411 and the traction rope 3 have a good abutment effect, avoid the position deviation of the traction rope 3 resulting in increased friction on the traction rope 3, thereby improving the service life of the traction rope 3, and can reduce energy loss.

[0042] Further, the second slow-release portion 30 is a cam, which is rotatably disposed on the support structure 10 via the rotating shaft 31, and the driving rod 412 is provided with a slot. When the cam is in the first position, the driving rod 412 is engaged with the cam. Specifically, in this embodiment, the second slow-release portion 30 is a cam, which is rotatably disposed between the two support plates 11 of the support structure 10 via the rotating shaft 31, and the driving rod 412 is provided with a slot. When the cam is in the first position, the slot is engaged with the cam, thereby ensuring that the cam and the traction rope 3 are spaced apart to avoid affecting the normal movement of the traction rope 3. When the traction rope 3 fails and breaks, the elastic member 42 releases energy, the driving rod 412 rotates relative to the cam, the cam is separated from the slot, and the cam rotates under the action of gravity, thereby enabling the cam to abut against the traction rope 3 to provide friction and clamping force to the traction rope 3.

[0043] Specifically, in this embodiment, the center of gravity height of the cam is the same as the axis height of the cam's rotating shaft 31. In other embodiments, the center of gravity height of the cam can be specifically set according to actual use, and can be slightly higher or lower than the axis height of the cam's rotating shaft 31, which will not be elaborated here.

[0044] Furthermore, the first slow-release portion 20 is provided with a groove, and the groove is used to accommodate the traction rope 3. Specifically, in this embodiment, since the first slow-release portion 20 is always in contact with the traction rope 3, the groove is formed on the first slow-release portion 20, which can be used to accommodate the traction rope 3, and can prevent the traction rope 3 from moving along the axial direction of the first slow-release portion 20, thereby improving the stability of the traction rope 3 during movement.

[0045] Specifically, in the present embodiment, the first release portion 20 is cylindrical, and the outer diameter of the first release portion 20 is tangent to the traction rope 3 when the traction rope 3 is tensioned, so that the contact area between the first release portion 20 and the traction rope 3 is smaller, thereby making the friction of the first release portion 20 on the traction rope 3 smaller, thereby ensuring the normal movement of the traction rope 3.

[0046] Furthermore, an anti-skid layer is provided on the periphery of the second slow-release portion 30. Specifically, in this embodiment, an anti-skid layer is provided on the periphery of the cam, which can increase the friction between the cam and the traction rope 3, so that the cam can have a better slow-release effect on the traction rope 3 when it is in the second position, thereby ensuring safety in use.

[0047] A gravity energy storage system is also provided in this embodiment. The gravity energy storage system includes a load-bearing unit, a weight unit 2 and a traction rope 3, and also includes the slow-release device as described above. The weight unit 2 is height-adjustably arranged on the load-bearing unit through the traction rope 3, at least one slow-release device is installed on the load-bearing unit, the traction rope 3 is passed between the first slow-release part 20 and the second slow-release part 30, and the traction rope 3 can stop the elastic member 42 in the energy storage state. Specifically, in this embodiment, the gravity energy storage system includes multiple carrying units, and the tops of the multiple carrying units are all rotatably provided with fixed pulleys 101, and a weight unit 2 is arranged between two adjacent carrying units. The multiple weight units 2 are connected in sequence through a traction rope 3, and the weight unit is connected to the traction rope 3 through a movable pulley 201, thereby reducing the wear of the traction rope 3 and the weight unit 2 and reducing energy loss. Along the height direction of the carrying unit, there can be multiple slow-release devices on each carrying unit, and the multiple slow-release devices are arranged at intervals. When the traction rope 3 fails and breaks, the multiple slow-release devices can act at the same time to provide friction and clamping force to the traction rope 3, so that the traction rope 3 carrying the weight unit 2 cannot fall rapidly without obstruction, thereby reducing the falling speed of all weight units 2, thereby avoiding causing greater damage to the entire gravity energy storage system.

[0048] For further information, please refer to Figure 2The load-bearing unit includes a support frame 1, and the slow-release device also includes a fixing plate 12. The fixing plate 12 is fixedly connected to the support structure 10, and the fixing plate 12 is locked to the support frame 1 through a locking member. Specifically, in this embodiment, the fixing plate 12 is fixedly connected to the bottom of the support structure 10, a first connecting hole is provided on the fixing plate 12, and a second connecting hole is provided on the support frame 1. The locking member includes a bolt and a nut. The bolt passes through the first connecting hole and the second connecting hole in sequence and is threadedly connected with the nut to connect the fixing plate 12 to the support frame 1. This connection method has good stability, is easy to disassemble and repair, and improves the convenience of use.

[0049] In other embodiments, the fixing plate 12 and the support frame 1 may also be directly welded, which has good stability and will not be elaborated here.

[0050] The following is a detailed description of the working process of the slow-release device in this embodiment. When the traction rope 3 is in a tensioned state, the traction rope 3 can apply a force to the abutment 411, so that the second ends of the two drive components 41 move away from each other, thereby stretching the spring connected between the two drive components 41, so that the spring is in an energy storage state. At this time, the slots of the drive rods 412 of the two drive components 41 are correspondingly engaged with the two cams, and the cams are in the first position, spaced apart from the traction rope 3, and the traction rope 3 can move normally; when the traction rope 3 fails and breaks, the force applied by the traction rope 3 to the abutment 411 disappears, and the spring releases energy, so that the two drive components 41 are in a state of energy storage. The second ends of the moving components 41 are close to each other, so that the slots of the two driving rods 412 are separated from the two cams respectively, the limit of the cam is released, and the cam moves from the first position under the action of gravity until it reaches the second position after abutting against the traction rope 3. The traction rope 3 is subjected to the friction and clamping force of the cam and the first slow release part 20, so that the moving speed of the traction rope 3 is reduced, and the weight unit 2 cannot slide down quickly without obstruction, and can only descend slowly driven by the traction rope 3, thereby protecting the gravity energy storage system and reducing the loss of the entire gravity energy storage system.

[0051] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A sustained-release device, characterized in that: The sustained-release device comprises: Support structure (10); a first slow-release portion (20) and a second slow-release portion (30), wherein the first slow-release portion (20) is fixedly arranged on the supporting structure (10), and the second slow-release portion (30) is rotatably arranged on the supporting structure (10); the first slow-release portion (20) and the second slow-release portion (30) are arranged at intervals to form a passage for passing a traction rope (3); the first slow-release portion (20) abuts against the traction rope (3), and the second slow-release portion (30) has a first position arranged at intervals from the traction rope (3) and a second position abutting against the traction rope (3); An elastic energy storage structure (40), the elastic energy storage structure (40) comprising a driving assembly (41) and an elastic member (42), the first end of the driving assembly (41) being arranged on the supporting structure (10), one end of the elastic member (42) being fixedly arranged, the other end of the elastic member (42) being connected to the driving assembly (41), the second end of the driving assembly (41) being able to abut against the traction rope (3) so that the elastic member (42) is in an energy storage state; when the elastic member (42) is in the energy storage state, the driving assembly (41) is able to limit the second release portion (30) to the first position; when the elastic member (42) releases energy, the driving assembly (41) and the second release portion (30) are released from the limit, and the second release portion (30) is able to switch to the second position.

2. The sustained-release device according to claim 1, characterized in that: The first slow-release portion (20), the second slow-release portion (30), and the driving assembly (41) are each provided with two, the two first slow-release portions (20) are arranged at intervals on the supporting structure (10), the two second slow-release portions (30) are arranged at intervals between the two first slow-release portions (20), and the two second slow-release portions (30) rotate in opposite directions when switching from the first position to the second position; the driving assembly (41) and the two second slow-release portions (30) can be limited in a one-to-one correspondence, and the elastic member (42) is connected between the two driving assemblies (41).

3. The sustained-release device according to claim 1, characterized in that: The driving assembly (41) comprises an abutment member (411) and two driving rods (412), wherein the two driving rods (412) are arranged in parallel and at intervals, the first ends of the two driving rods (412) are rotatably arranged on the supporting structure (10), the abutment member (411) is arranged at the second ends of the two driving rods (412), and the abutment member (411) is located between the two driving rods (412), and the abutment member (411) is used to abut against the traction rope (3).

4. The sustained-release device according to claim 3, characterized in that: The abutment member (411) is rotatably disposed on the driving rod (412).

5. The sustained-release device according to claim 3, characterized in that: The abutment member (411) is provided with an abutment groove, and the abutment groove is used to accommodate the traction rope (3).

6. The sustained-release device according to claim 3, characterized in that: The second slow-release portion (30) is a cam, which is rotatably arranged on the support structure (10) via a rotating shaft (31), and the driving rod (412) is provided with a slot, and when the cam is in the first position, the slot is engaged with the cam.

7. The sustained-release device according to claim 6, characterized in that: The first slow-release portion (20) is provided with a groove, and the groove is used to accommodate the traction rope (3).

8. The sustained-release device according to any one of claims 1 to 7, characterized in that: An anti-slip layer is provided on the outer periphery of the second slow-release portion (30).

9. A gravity energy storage system, characterized in that: The gravity energy storage system comprises a load-bearing unit, a weight unit (2) and a traction rope (3), and the gravity energy storage system further comprises a slow-release device as described in any one of claims 1 to 8, the weight unit (2) is height-adjustably arranged on the load-bearing unit via the traction rope (3), at least one slow-release device is installed on the load-bearing unit, the traction rope (3) is passed between the first slow-release portion (20) and the second slow-release portion (30), and the traction rope (3) can stop the elastic member (42) in the energy storage state.

10. The gravity energy storage system according to claim 9, characterized in that: The bearing unit comprises a support frame (1), and the slow-release device further comprises a fixing plate (12), wherein the fixing plate (12) is fixedly connected to the support structure (10), and the fixing plate (12) is locked to the support frame (1) via a locking member.

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