Circulating type gravity energy storage system based on slope and working method of circulating type gravity energy storage system

Abstract

The invention discloses a circulation type gravity energy storage system based on a slope and a working method thereof. The system comprises an annular conveying track, and a plurality of conveying vehicles are arranged on the annular conveying track; the annular conveying track comprises an upper bin section track, a working section track, a lower bin section track and a return section track which are connected in sequence, and the return section track is connected with the upper bin section track to form a closed loop; the upper bin track goods shelf and the lower bin track goods shelf each comprise an auxiliary limiting frame. The multiple rows of auxiliary limiting frames are vertically arranged side by side, a layer of three-dimensional stacking space used for storing the heavy blocks in a three-dimensional stacking mode is formed between every two adjacent rows of auxiliary limiting frames, and rotatable universal balls are arranged on the two side faces, corresponding to the auxiliary limiting frames, of the heavy blocks. According to the scheme, continuous transportation of the heavy blocks can be achieved, the stable power generation process is achieved, meanwhile, the heavy blocks can stably move in the track goods shelf, energy loss is very small, safety in the stacking process of the heavy blocks can be enhanced, and the hoisting speed can also be increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of gravity energy storage power generation, and in particular relates to a slope-based circulating gravity energy storage system and a working method thereof. Background Art

[0002] Slope-based gravity energy storage systems are built on slopes (such as mountains or artificial slopes). Their basic principle is the conversion between electrical energy and the gravitational potential energy of a heavy object, using the weight's gravitational potential energy for energy storage. Typically, electricity drives an electric motor to transport the weight from the bottom of the slope (lower altitude) to the top (higher altitude), converting the electrical energy into the weight's gravitational potential energy for storage and charging the energy storage system. Under the influence of gravity, the weight moves from the top of the slope to the lower level, driving a generator to generate electricity, converting the gravitational potential energy into electricity and feeding it into the grid, thus enabling the energy storage system to generate electricity. As a commercial, engineered power project, the success of a gravity energy storage project depends on its economic viability, safety, and reliability.

[0003] The energy stored in the gravity energy storage system is the gravitational potential energy of the weight blocks. The overall gravitational potential energy is related to the individual mass, quantity and height difference of the weight blocks. When the height difference is constant, in order to ensure a larger power generation capacity, the total mass of the weight blocks must be increased. Weight blocks are usually large in weight, for example, tens to hundreds of tons, which will cause large shaking during the lifting process, and the stability and efficiency will be limited. If the individual mass is too large, the capacity of the conveying equipment will be limited, and the site selection environment is often also limited. Therefore, the mass of a single weight block cannot be too large. Therefore, it is necessary to consider increasing the number of weight blocks. If the number is too large, there will be a situation where the upper and lower warehouses of the factory site cannot accommodate them. In addition, it is necessary to consider stacking the weight blocks in three dimensions, where the efficiency and stability of the stacking are particularly important. The prior art lacks detailed consideration of this. In addition, the transportation route of the weight blocks and the overall layout of the storage and transportation system are also key issues affecting operating efficiency. The weight blocks need to be continuously transported to achieve a relatively stable power generation process. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a slope-based circulating gravity energy storage system and its working method, so as to solve the shortcomings of the existing technology in terms of efficiency and stability, realize the circulating transportation and three-dimensional stacking of heavy blocks, achieve a larger power generation capacity, reduce the fluctuation of power generation, and have high operating stability.

[0005] According to the technical solution of the present invention, the present invention provides a slope-based circulating gravity energy storage system, comprising a high-altitude area, a slope and a low-altitude area connected in sequence; further comprising a circular conveying track, on which a plurality of conveying vehicles are arranged; the circular conveying track comprises an upper warehouse section track, a working section track, a lower warehouse section track and a return section track connected in sequence, and the return section track is further connected to the upper warehouse section track to form a closed loop; the upper warehouse section track and the lower warehouse section track are respectively located in the high-altitude area and the low-altitude area, and the working section track and the return section track are both located on the slope; in the high-altitude area Upper warehouse rail shelves and upper warehouse handling equipment are provided, and lower warehouse rail shelves and lower warehouse handling equipment are provided in the low altitude area; the upper warehouse rail shelves and the lower warehouse rail shelves both include auxiliary limit frames; the auxiliary limit frames are vertically arranged and arranged in multiple rows side by side, and a three-dimensional stacking space for three-dimensionally stacking heavy blocks is formed between two adjacent rows of auxiliary limit frames, and the heavy blocks are provided with rotatable universal balls on both side surfaces corresponding to the auxiliary limit frames; the upper warehouse handling equipment and the lower warehouse handling equipment both include cranes that can lift heavy blocks in three directions of space X, Y, and Z.

[0006] In some embodiments, a working section chain conveyor is arranged next to the working section track, and the working section chain conveyor is connected to the working section drive equipment and the power generation equipment; a return section chain conveyor is arranged next to the return section track, and the return section chain conveyor is connected to the return section drive equipment; the working section chain conveyor and the return section chain conveyor are provided with a first connecting and detaching component, and the conveying vehicle is provided with a matching second connecting and detaching component.

[0007] In some embodiments, the first connecting and detaching component is a support block; the working section chain conveyor is arranged in parallel on both sides of the working section track, and the support blocks on the working section chain conveyor are multiple and spaced apart along the length direction of the working section track, and the support blocks protrude toward the working section track and can move with the operation of the working section chain conveyor; the return section chain conveyor is arranged in parallel on both sides of the return section track, and the support blocks on the return section chain conveyor are multiple and spaced apart along the length direction of the return section track, and the support blocks protrude toward the return section track and can move with the operation of the return section chain conveyor; the second connecting and detaching component is a retractable block arranged on both sides of the conveyor vehicle.

[0008] In some embodiments, the transport vehicle is further provided with a sensor for detecting the position of the support block, and / or the transport vehicle is a four-way shuttle rail-guided vehicle.

[0009] In some embodiments, the working segment driving device and the return segment driving device are both connected to a motor frequency converter, so that the working segment chain conveyor and the return segment chain conveyor can run at the same uniform speed.

[0010] In some embodiments, the upper warehouse handling equipment and the lower warehouse handling equipment are both gantry cranes. The gantry crane includes vertical frames located on both sides, with cross beams provided on the vertical frames. A crane is connected to the cross beam through an X-axis moving mechanism. The crane has a hook that can move and lift in the Z direction, and a Y-axis moving mechanism is provided at the bottom of the vertical frame.

[0011] In some embodiments, the upper warehouse rail rack and the lower warehouse rail rack further include a base, the auxiliary limit frame is arranged on the base, the base has a channel in the middle, and the upper warehouse section rail and the lower warehouse section rail pass through the channel of the base. In some embodiments, each row of auxiliary limit frames includes transverse steel structures and vertical steel structures, which are connected to form a mesh structure, and the spacing distances between the transverse steel structures and the spacing distances between the vertical steel structures match the size of the weight blocks.

[0012] According to the technical solution of the present invention, the present invention also provides a working method of a slope-based circulating gravity energy storage system, which is implemented using the slope-based circulating gravity energy storage system of the present invention; Under energy storage conditions, the following processes are included: In the low-altitude area, the lower warehouse handling equipment removes the heavy blocks from the lower warehouse rail rack and loads them onto the conveyor vehicle on the lower warehouse section track; the conveyor vehicle loaded with the heavy blocks moves toward the slope and adjusts its speed to the same speed as the uphill working section chain conveyor. After reaching the working section chain conveyor position, the conveyor vehicle is connected to the second connecting and disconnecting component of the working section chain conveyor through the first connecting and disconnecting component. The conveyor vehicle then shuts off its own power and is pulled uphill by the working section chain conveyor to the high-altitude area; After the transport vehicle reaches the position of the upper warehouse section track, it is disconnected from the working section chain conveyor, and at the same time, the transport vehicle recovers its own power and runs along the upper warehouse section track to the upper warehouse track shelf and stops; the upper warehouse handling equipment lifts the heavy objects on the transport vehicle and places them on the upper warehouse track shelf; the empty transport vehicle continues to run to the position of the return section track, and then connects to the second connecting and disconnecting component of the return section chain conveyor through the first connecting and disconnecting component, shuts off its own power, and is pulled to the low altitude area by the return section chain conveyor; When the transport vehicle reaches the position of the lower warehouse section track, it will be disconnected from the chain conveyor of the return section. At the same time, the transport vehicle will restore its own power and run along the lower warehouse section track to the lower warehouse track shelf and stop to wait for the next heavy block to be loaded; Each transport vehicle repeats the above process, and multiple transport vehicles run continuously and sequentially on the circular transport track to continuously transport the required number of heavy blocks in the lower warehouse rail rack to the upper warehouse rail rack for storage; Under power generation conditions, the following processes are included: At high altitudes, the upper warehouse handling equipment removes the heavy blocks from the upper warehouse rail racks and loads them onto a conveyor vehicle on the upper warehouse section track. The conveyor vehicle, loaded with the heavy blocks, moves toward the slope and adjusts its speed to the same rate as the downhill working section chain conveyor. After reaching the working section chain conveyor, the conveyor vehicle connects to the working section chain conveyor's second connecting and disconnecting component via a first connecting and disconnecting component. The conveyor vehicle then shuts off its own power and slides downward under the action of gravity, driving the working section chain conveyor, which in turn drives the power generation equipment to generate electricity, converting gravitational potential energy into electrical energy. After the transport vehicle reaches the position of the lower warehouse section track, it is disconnected from the working section chain conveyor, and at the same time, the transport vehicle recovers its own power and runs along the lower warehouse section track to the lower warehouse track shelf and stops; the lower warehouse handling equipment lifts the heavy objects on the transport vehicle and places them on the lower warehouse track shelf; the empty transport vehicle continues to run to the position of the return section track, and then connects to the second connecting and disconnecting component of the return section chain conveyor through the first connecting and disconnecting component, shuts off its own power, and is pulled to the high altitude area by the return section chain conveyor; When the transport vehicle reaches the position of the upper warehouse section track, it will be disconnected from the chain conveyor of the return section. At the same time, the transport vehicle will restore its own power and run along the upper warehouse section track to the upper warehouse track shelf and stop to wait for the next heavy object to be loaded; Each transport vehicle repeats the above process, and multiple transport vehicles run continuously and sequentially on the circular transport track to continuously lower the required number of heavy blocks from the upper warehouse rail rack and transport them to the lower warehouse rail rack for storage; Among them, under energy storage conditions and power generation conditions, when taking out and placing heavy blocks, the single movement process of the heavy block only moves in one direction of the horizontal and vertical directions. After reaching the middle set position, it turns to move in the other direction and finally reaches the required taking-out position or placement position. In the process of transporting and moving, the universal ball on at least one side of the heavy block is always in contact with the auxiliary limit frame.

[0013] In some embodiments, during power generation, when a transport vehicle loaded with heavy objects is about to leave the working section chain conveyor near a low altitude area, another transport vehicle loaded with heavy objects is about to enter the working section chain conveyor at a high altitude area. And / or, the working section chain conveyor and the return section chain conveyor are both provided with a chain conveyor detection and monitoring system for monitoring the operating status of the chains and chain guide wheels of the working section chain conveyor and the return section chain conveyor. The detected operating status includes the tensioning status of the chain and whether the chain and the chain guide wheel are faulty. If an abnormal operating status is detected, the slope-based circulating gravity energy storage system automatically shuts down and issues an alarm message.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are as follows: In the slope-based circulating gravity energy storage system and its working method of the present invention, the overall conveying track forms a closed loop, which can realize the continuous transportation of heavy blocks during operation, thereby realizing a relatively stable power generation process; at the same time, universal balls are installed on both sides of the heavy blocks, and a track shelf with a limit and a track integrated with each other is designed to store the heavy blocks. When the heavy blocks shake during lifting, the universal balls will contact the side of the track shelf to generate rolling friction, and then they can stably move in the track shelf in four directions such as up, down, left and right, and the energy loss generated will be very small, which can not only enhance the safety of the stacking process of the heavy blocks, but also speed up the lifting speed; and further, this solution can flexibly change the number and quality of the heavy blocks, the number of conveying vehicles, and the number and lifting capacity of the handling equipment according to the actual power capacity requirements and actual site selection conditions, thereby forming a slope-type gravity energy storage solution adapted to local conditions, with high conversion efficiency and high operational stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the gravity energy storage system provided by the present invention.

[0016] Figure 2 yes Figure 1 Top view of .

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure of the weight block provided by the present invention.

[0018] Figure 4 It is a schematic diagram of the three-dimensional structure of the return section track and the transport vehicle part provided by the present invention.

[0019] Figure 5 It is a schematic diagram of the main structure of the high altitude area provided by the present invention.

[0020] Description of reference numerals in the accompanying drawings: 11. High altitude area; 12. Slope; 13. Low altitude area; 21. Upper warehouse section track; 22. Working section track; 221. Working section chain conveyor; 23. Lower warehouse section track; 24. Return section track; 241. Return section chain conveyor; 30. Transport vehicle; 41. Upper warehouse track shelf; 42. Lower warehouse track shelf; 43. Auxiliary limit frame; 44. Base; 51. Upper warehouse handling equipment; 52. Lower warehouse handling equipment; 60. Heavy object block; 61. Universal ball transfer; 70. Crane; 71. Vertical frame; 72. Crossbeam; 81. Support block; 82. Retractable stopper. DETAILED DESCRIPTION

[0021] The present invention provides a slope-based circulating gravity energy storage system and its working method, which solves the shortcomings of the existing technology in terms of efficiency and stability, realizes the circulating transportation and three-dimensional stacking of heavy blocks, can achieve a larger power generation capacity, reduce power generation fluctuations, and has high operational stability.

[0022] See also Figures 1 to 3 The present invention provides a slope-based circulating gravity energy storage system, which includes a high-altitude area 11, a slope 12 and a low-altitude area 13 connected in sequence. It also includes a circular conveying track, on which a plurality of conveying vehicles 30 are arranged. The circular conveying track includes an upper warehouse section track 21, a working section track 22, a lower warehouse section track 23 and a return section track 24 connected in sequence, and the return section track 24 is further connected to the upper warehouse section track 21 to form a closed loop. The upper warehouse section track 21 and the lower warehouse section track 23 are respectively located in the high-altitude area 11 and the low-altitude area 13, and the working section track 22 and the return section track 24 are both located on the slope 12. The conveying vehicle 30 can perform a circular motion along the circular conveying track. The function of the conveying vehicle 30 includes transporting heavy blocks 60 between the high and low altitude areas. The conveying vehicle 30 carrying the heavy blocks 60 can drive the power generation equipment to generate electricity during the downhill process.

[0023] Upper rail racks 41 and upper handling equipment 51 are installed in the high-altitude area 11, while lower rail racks 42 and lower handling equipment 52 are installed in the low-altitude area 13. Both upper rail racks 41 and lower rail racks 42 include auxiliary limit racks 43. These limit racks 43 are arranged vertically and arranged in multiple rows side by side. Between adjacent rows of auxiliary limit racks 43, a three-dimensional stacking space is formed for stacking heavy blocks 60. This allows for three-dimensional storage of heavy blocks 60, which improves space utilization compared to conventional two-dimensional storage methods and facilitates the storage of a larger number of heavy blocks 60.

[0024] Please also see Figure 3The weight block 60 is provided with rotatable universal balls 61 on both sides corresponding to the auxiliary limit frame 43; in other words, the weight block 60 is provided with universal balls 61 on two opposite sides, and the weight block 60 is placed so that the universal balls 61 face the auxiliary limit frame 43. As a supplementary explanation, the universal ball is an auxiliary device that can flexibly roll on the working plane, also known as a universal roller. Preferably, the three-dimensional stacking space matches the size of the heavy object block 60. Within the three-dimensional stacking space, the universal ball 61 on at least one side of the heavy object block 60 will contact or almost contact the auxiliary limit frame 43. In addition to serving as a limiter for ordinary shelves, the auxiliary limit frame 43 is more important. Since there is inevitable shaking during the lifting process, the universal ball 61 on at least one side of the heavy object block 60 will usually roll and rub against the auxiliary limit frame 43. Therefore, the auxiliary limit frame 43 also serves as the running track during the lifting process of the heavy object block 60, ensuring the stability of the process of placing and removing the heavy object block 60 from the upper and lower warehouse track shelves, thereby helping to achieve a faster lifting process and improve operating efficiency.

[0025] Preferably, each row of auxiliary limit frames 43 includes transverse steel structures and vertical steel structures, which are connected to form an interlaced mesh structure, and the spacing distances between the transverse steel structures and the spacing distances between the vertical steel structures are matched with the size of the weight block 60, so that the position of the steel structure corresponds to the movement path of the universal ball 61 of the weight block 60 during transportation, so that the side of the steel structure can contact the universal ball 61, thereby achieving the effect of limiting and serving as a track.

[0026] More specifically, the main part of the weight block 60 is a cubic or rectangular concrete block or metal block, and universal balls 61 are embedded and installed at the center positions of two opposite sides of the weight block 60. The weight blocks 60 are regularly stacked in three dimensions in the upper and lower warehouse rail shelves. Furthermore, the position of the vertical steel structure corresponds to the center position of each vertical column of weight blocks 60, and the position of the horizontal steel structure corresponds to the center position of each horizontal row of weight blocks 60. The position and coverage of the steel structure are specifically designed to enable, for example, the weight block 60 to be lifted a short distance relative to the stacking position when being taken out, and then continue to be lifted vertically or moved horizontally. The placement process is the opposite of this. The universal balls 61 do not leave the range of the steel structure during the removal and prevention processes.

[0027] The upper warehouse handling equipment 51 and the lower warehouse handling equipment 52 both include a crane 70 that can lift the heavy object block 60 in the three directions of space X, Y, and Z. Specifically, for example, the upper warehouse handling equipment 51 and the lower warehouse handling equipment 52 are both gantry cranes. The gantry crane includes a vertical frame 71 located on both sides, and a crossbeam 72 is provided on the vertical frame 71. The crossbeam 72 is connected to the crane 70 through an X-direction moving mechanism. The crane 70 has a hook that can move and lift in the Z direction. The bottom of the vertical frame 71 is provided with a Y-direction moving mechanism. The Y-direction moving mechanism is, for example, a moving wheel. A Y-direction track is also provided on the ground in high and low altitude areas. As a supplementary explanation, the length direction of the crossbeam 72 is the X direction, the X direction is perpendicular to the Y direction, and the Z direction is the vertical direction. Furthermore, a lifting hole structure is provided in the middle above the heavy object block 60. The lifting hole structure is preferably not higher than the upper surface of the heavy object block 60 so as not to affect the stability of the stacking. It is understandable that the heavy object can be lifted using existing technologies or other feasible methods, and the present invention is not limited to the specific embodiments.

[0028] See also Figure 5 Preferably, the upper warehouse rail shelf 41 and the lower warehouse rail shelf 42 also include a base 44, and the auxiliary limit frame 43 is fixedly arranged on the base 44. The base 44 has a channel in the middle; in other words, the base is divided into two parts, with a gap between them to form a channel. The upper warehouse section rail 21 and the lower warehouse section rail 23 pass through the channel of the base 44. The heavy blocks 60 are stacked on the base 44, leaving space at the channel. Further preferably, the auxiliary limit frame 43 has a vertical steel structure above the channel to provide a lifting and moving track for the heavy blocks 60 above the channel. In this solution, the position of the conveying vehicle 30 for loading and unloading the heavy blocks 60 is at the channel in the middle position of the upper and lower warehouse shelf rail shelves, which can reduce the moving distance of the crane of the upper and lower warehouse handling equipment, reduce energy consumption and increase efficiency.

[0029] See also Figure 1 、 Figure 2 、 Figure 4 In a preferred embodiment, a working-segment chain conveyor 221 is installed adjacent to the working-segment track 22. The working-segment chain conveyor 221 is connected to a working-segment drive system and a power generation device. A return-segment chain conveyor 241 is installed adjacent to the return-segment track 24. The return-segment chain conveyor 241 is connected to the return-segment drive system. The working-segment chain conveyor 221 and the return-segment chain conveyor 241 are independent and driven by corresponding drive systems. The working-segment chain conveyor 221 is used only to transport transport vehicles 30 loaded with heavy objects 60; the return-segment chain conveyor 241 is used only to transport empty transport vehicles 30, thus facilitating the recycling of transport vehicles. The working-segment drive system preferably uses a high-power motor to drive the heavy-load chain (the working-segment chain conveyor 221), while the return-segment drive system preferably uses a low-power motor to drive the light-load chain (the return-segment chain conveyor 241).

[0030] Further preferably, the working section drive device and the return section drive device are both connected to a motor frequency converter so that the working section chain conveyor 221 and the return section chain conveyor 241 can run at the same uniform speed; for example, when generating electricity, the speed of the uphill circulation of the empty transport vehicle 30 can be adapted to the speed of the lowering of the transport vehicle 30 loaded with heavy blocks 60, so that the process of lowering power generation does not require unnecessary waiting time and can be carried out continuously.

[0031] A first connecting and detaching component is provided on the working section chain conveyor 221 and the return section chain conveyor 241, and a matching second connecting and detaching component is provided on the conveying vehicle 30 to realize the connection and separation of the conveying vehicle 30 and the chain conveyor. The connecting and detaching component can, for example, adopt an existing detaching rope gripper or a structure connected in a hook-card manner.

[0032] Preferably, the first connecting and disconnecting component is a support block 81. The working section chain conveyor 221 is arranged parallel to both sides of the working section track 22. A plurality of support blocks 81 are arranged on the working section chain conveyor 221 at intervals along the length of the working section track 22. The support blocks 81 protrude toward the working section track 22 and can move with the operation of the working section chain conveyor 221. Similarly, the return section chain conveyor 241 is arranged parallel to both sides of the return section track 24. A plurality of support blocks 81 are arranged on the return section chain conveyor 241 at intervals along the length of the return section track 24. The support blocks 81 protrude toward the return section track 24 and can move with the operation of the return section chain conveyor 241. Specifically, the main component of the chain conveyor is a chain. Multiple support blocks 81 are evenly distributed and fixedly connected on the inner side of the chain links, so that the support blocks 81 can move with the chain.

[0033] Correspondingly, the second connecting and detaching component is a retractable block 82 provided on both sides of the conveying vehicle 30. The retractable block 82 is retracted into the conveying vehicle 30 in high and low altitude areas (flat areas); after entering the slope 12, the retractable block 82 is extended, and then contacts and cooperates with the support block 81 of the chain conveyor belt to bear force, so that the conveying vehicle 30 is pulled by the chain or the chain is pulled by the conveying vehicle 30 during the uphill and downhill process. It is further preferred that a sensor for detecting the position of the support block is also provided on the conveying vehicle 30, so that the retractable block 82 will not interfere with the support block 81 during the extension process. The conveying vehicle of this solution cooperates with the chain conveyor belt to realize the upward and downward movement of the conveying vehicle, and the structure is simple and the connection and separation of the conveying vehicle and the chain conveyor belt are realized efficiently.

[0034] It is conceivable that in other feasible embodiments, the second connecting and detaching components are blocks fixedly arranged on both sides of the conveyor vehicle 30. Based on the movement trajectory of the support block 81, the position of the block can be designed to determine when it enters the chain area so that it will subsequently conflict with the support block 81 and achieve the desired effect. The same applies to the detachment process; this solution has high requirements for the overall scheduling and operation control of the system.

[0035] The transport vehicle 30 is preferably a four-way shuttle rail guided vehicle (RGV), a rail-mounted transport vehicle with two sets of wheels capable of moving in four directions on a flat surface, offering great flexibility. The circular transport track is compatible with the transport vehicle 30. For example, in the embodiment, the upper and lower sections of the track 21, 23 are arranged in a rectangular shape with three sides, allowing the transport vehicle 30 to reverse direction and re-enter the slope 12 through two 90° turns. The transport vehicle 30 has two power sources during operation: one is to shut down its own power system and be driven by a chain when going up or down a slope; the other is to use its own power system (battery-powered or track busbar-powered) when operating in high and low altitude areas (e.g., generally flat areas).

[0036] Based on the gravity energy storage system of the present invention, the present invention also provides a working method of a slope-based circulating gravity energy storage system. Generally speaking, the working method of the gravity energy storage system mainly consists of two parts: energy storage and discharge: when storing energy, the heavy block is lifted from a low altitude (lower warehouse) to a high altitude (upper warehouse) for storage, and the electrical energy is finally converted into gravitational potential energy; when discharging, the heavy block is lowered from a high altitude (upper warehouse) to a low altitude (lower warehouse), and the gravitational potential energy is first converted into kinetic energy, which drives the generator to generate electricity and is finally converted into electrical energy. In this solution, the electric power generation system mainly includes working section drive equipment, return section drive equipment, power generation equipment, etc. The chain is associated with the electric power generation system. When the chain pulls the conveyor vehicle uphill, it is in an electric state. When the conveyor vehicle goes downhill and drives the chain to rotate, it is in a power generation state.

[0037] Specifically, under energy storage conditions, the following processes are included: In the low-altitude area 13, the lower warehouse handling equipment 52 takes the heavy object 60 from the lower warehouse track shelf 42 and loads it onto the conveyor trolley 30 on the lower warehouse section track 23; the conveyor trolley 30 loaded with the heavy object 60 moves toward the slope 12 and adjusts its speed to the same speed as the uphill working section chain conveyor 221. After reaching the position of the working section chain conveyor 221, the conveyor trolley 30 is connected to the second connecting and disconnecting component of the working section chain conveyor 221 through the first connecting and disconnecting component. Then, the conveyor trolley 30 turns off its own power and is pulled uphill by the working section chain conveyor 221 to the high-altitude area 11; After the transport vehicle 30 reaches the position of the upper warehouse section track 21, it is disconnected from the working section chain conveyor 221. At the same time, the transport vehicle 30 recovers its own power and runs along the upper warehouse section track 21 to the upper warehouse track shelf 41 and stops. The upper warehouse handling equipment 51 lifts the heavy object 60 on the transport vehicle 30 and places it on the upper warehouse track shelf 41. The empty transport vehicle 30 continues to run to the position of the return section track 24, and then connects to the second connecting and disconnecting component of the return section chain conveyor 241 through the first connecting and disconnecting component. The transport vehicle 30 turns off its own power and is towed to the low altitude area 13 by the return section chain conveyor 241. After the transport vehicle 30 reaches the position of the lower warehouse section track 23, it is disconnected from the return section chain conveyor 241. At the same time, the transport vehicle 30 recovers its own power and runs along the lower warehouse section track 23 to the lower warehouse track shelf 42 and stops to wait for the next heavy object 60 to be loaded; Each transport vehicle 30 repeats the above process, and multiple transport vehicles 30 run continuously and sequentially on the circular transport track to continuously transport the required number of heavy blocks 60 in the lower warehouse track shelf 42 to the upper warehouse track shelf 41 for storage.

[0038] Under power generation conditions, the following processes are included: In the high-altitude area 11, the upper warehouse handling equipment 51 removes the heavy object 60 from the upper warehouse track shelf 41 and loads it onto the conveyor trolley 30 on the upper warehouse section track 21; the conveyor trolley 30 loaded with the heavy object 60 moves toward the slope 12 and adjusts its speed to the same rate as the downhill working section chain conveyor 221. After reaching the position of the working section chain conveyor 221, the conveyor trolley 30 is connected to the second connecting and disconnecting component of the working section chain conveyor 221 through the first connecting and disconnecting component. Then, the conveyor trolley 30 turns off its own power and slides downward under the action of gravity, driving the working section chain conveyor 221, driving the power generation equipment to generate electricity, and converting gravitational potential energy into electrical energy; After the transport vehicle 30 reaches the position of the lower warehouse section track 23, it is disconnected from the working section chain conveyor 221. At the same time, the transport vehicle 30 recovers its own power and runs along the lower warehouse section track 23 to the lower warehouse track shelf 42 and stops. The lower warehouse handling equipment 52 lifts the heavy object 60 on the transport vehicle 30 and places it on the lower warehouse track shelf 42. The empty transport vehicle 30 continues to run to the position of the return section track 24, and then connects to the second connecting and disconnecting component of the return section chain conveyor 241 through the first connecting and disconnecting component. The transport vehicle 30 turns off its own power and is towed to the high altitude area 11 by the return section chain conveyor 241. After the transport vehicle 30 reaches the position of the upper warehouse section track 21, it is disconnected from the return section chain conveyor 241. At the same time, the transport vehicle 30 recovers its own power and runs along the upper warehouse section track 21 to the upper warehouse track shelf 41 and stops to wait for the next heavy object 60 to be loaded; Each transport vehicle 30 repeats the above process, and multiple transport vehicles 30 run continuously and sequentially on the circular transport track to continuously lower the required number of heavy blocks 60 from the upper warehouse track shelf 41 and transport them to the lower warehouse track shelf 42 for storage.

[0039] Among them, it should be noted that under the energy storage condition and the power generation condition, when taking out and placing the heavy block 60, the single movement process of the heavy block 60 only moves in one direction of the horizontal and vertical directions. After reaching the middle set position, it turns to move in the other direction and finally reaches the required taking-out position or placement position. In addition, during the transportation and movement process, the universal ball 61 on at least one side of the heavy block 60 is always in contact with the auxiliary limit frame 43.

[0040] Preferably, the working section chain conveyor 221 and the return section chain conveyor 241 are both provided with a chain conveyor detection and monitoring system for monitoring the operating status of the chains and chain guide wheels of the working section chain conveyor 221 and the return section chain conveyor 241. The detected operating status includes the tensioning status of the chain and whether the chain and the chain guide wheel are faulty. If an abnormal operating status is detected, the slope-based circulating gravity energy storage system automatically shuts down and issues an alarm message.

[0041] In terms of scheduling rhythm, the power generation system will produce certain fluctuations when the transport vehicle 30 carrying heavy objects 60 enters or exits the working section chain conveyor 221. Therefore, preferably, under power generation conditions, when a transport vehicle 30 carrying heavy objects 60 is about to leave the working section chain conveyor 221 near the low altitude area 13, another transport vehicle 60 carrying heavy objects 60 is about to enter the working section chain conveyor 221 in the high altitude area 11. In this way, the fluctuation of the power generation is reduced. This process is coordinated by the control system for the overall operation of the upper and lower warehouse handling equipment, the transport vehicle, and the chain conveyor.

[0042] In addition, in terms of power output, specific designs can be made based on the actual index requirements of the project for the fluctuation rate of power generation. For example, the stability of power generation can be further enhanced in the following ways: 1. Appropriately increase the number of conveyor vehicles and appropriately reduce the mass of a single heavy block. In this way, the heavy blocks on the slope will be denser during power generation, and the mass ratio of a single heavy block to all the heavy blocks on the working section chain conveyor will decrease. In this way, the fluctuation caused by a single heavy block entering and exiting the working section chain conveyor will be reduced. 2. Flywheel energy storage can be added, and the flywheel stores energy or generates electricity at the time when fluctuations occur to reduce fluctuations. 3. Using the structure shown in the present invention as a gravity energy storage module unit, multiple slope-based gravity energy storage module units are constructed, and the scheduling and coordination of different module units are adjusted to superimpose and synthesize their power generation to reduce fluctuations.

[0043] To sum up, in the slope-based circulating gravity energy storage system and its working method of the present invention, the overall conveying track forms a closed loop, which can realize the continuous transportation of heavy blocks during operation, thereby realizing a relatively stable power generation process; at the same time, universal balls are installed on both sides of the heavy blocks, and a track shelf with a limit and a track integrated with each other is designed to store heavy blocks. When the heavy blocks shake during lifting, the universal balls will contact the side of the track shelf to generate rolling friction, and then they can stably move in the track shelf in four directions such as up, down, left and right, and the energy loss generated will be very small, which can not only enhance the safety of the stacking process of heavy blocks, but also speed up the lifting speed; and then this scheme can flexibly change the number and quality of heavy blocks, the number of conveying vehicles, and the number and lifting capacity of handling equipment according to the actual power capacity requirements and actual site selection conditions, thereby forming a slope-type gravity energy storage solution adapted to local conditions, with high conversion efficiency and high operational stability.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; obviously, the embodiments described are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention; for ease of description, only the parts related to the relevant inventions are shown in the accompanying drawings. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other; modifying the technical solutions described in the aforementioned embodiments, or making equivalent replacements for some of the technical features therein, does not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A slope-based circulating gravity energy storage system, characterized in that: The invention comprises a high altitude area (11), a slope (12) and a low altitude area (13) connected in sequence; and also comprises a circular conveying track, on which a plurality of conveying vehicles (30) are arranged; the circular conveying track comprises an upper warehouse section track (21), a working section track (22), a lower warehouse section track (23) and a return section track (24) connected in sequence, and the return section track (24) is further connected to the upper warehouse section track (21) to form a closed loop; the upper warehouse section track (21) and the lower warehouse section track (23) are respectively located in the high altitude area (11) and the low altitude area (13), and the working section track (22) and the return section track (24) are both located on the slope (12); An upper warehouse rail rack (41) and an upper warehouse handling device (51) are provided in the high altitude area (11), and a lower warehouse rail rack (42) and a lower warehouse handling device (52) are provided in the low altitude area (13); the upper warehouse rail rack (41) and the lower warehouse rail rack (42) both include auxiliary limit racks (43); the auxiliary limit racks (43) are vertically arranged and arranged in multiple rows side by side, and a three-dimensional stacking space for three-dimensionally stacking heavy blocks (60) is formed between two adjacent rows of auxiliary limit racks (43), and the heavy blocks (60) are provided with rotatable universal balls (61) on both side surfaces corresponding to the auxiliary limit racks (43); the upper warehouse handling device (51) and the lower warehouse handling device (52) both include a crane (70) capable of lifting the heavy blocks (60) in the three directions of X, Y, and Z in space.

2. The slope-based circulating gravity energy storage system according to claim 1, characterized in that: A working section chain conveyor (221) is provided beside the working section track (22), and the working section chain conveyor (221) is connected to a working section drive device and a power generation device; a return section chain conveyor (241) is provided beside the return section track (24), and the return section chain conveyor (241) is connected to the return section drive device; a first connecting and disconnecting component is provided on the working section chain conveyor (221) and the return section chain conveyor (241), and a matching second connecting and disconnecting component is provided on the transport vehicle (30).

3. The slope-based circulating gravity energy storage system according to claim 2, characterized in that: The first connecting and disconnecting component is a support block (81); the working section chain conveyor (221) is arranged in parallel on both sides of the working section track (22); the support blocks (81) on the working section chain conveyor (221) are arranged in parallel along the length direction of the working section track (22); the support blocks (81) protrude toward the working section track (22) and can move along with the operation of the working section chain conveyor (221); the return section chain conveyor (241) is arranged in parallel on both sides of the return section track (24); the support blocks (81) on the return section chain conveyor (241) are arranged in parallel along the length direction of the return section track (24); the support blocks (81) protrude toward the return section track (24) and can move along with the operation of the return section chain conveyor (241); the second connecting and disconnecting component is a retractable block (82) arranged on both sides of the transport vehicle (30).

4. The slope-based circulating gravity energy storage system according to claim 3, characterized in that: The transport vehicle (30) is further provided with a sensor for detecting the position of the support block, and / or the transport vehicle (30) is a four-way shuttle rail-guided vehicle.

5. The slope-based circulating gravity energy storage system according to claim 2, characterized in that: The working section drive device and the return section drive device are both connected to a motor frequency converter so that the working section chain conveyor (221) and the return section chain conveyor (241) can run at the same speed.

6. The slope-based circulating gravity energy storage system according to any one of claims 1 to 5, characterized in that: The upper warehouse handling equipment (51) and the lower warehouse handling equipment (52) are both gantry cranes. The gantry cranes include vertical frames (71) located on both sides. A crossbeam (72) is provided on the vertical frame (71). A crane (70) is connected to the crossbeam (72) via an X-direction moving mechanism. The crane (70) has a hook that can be moved and raised in the Z direction. A Y-direction moving mechanism is provided at the bottom of the vertical frame (71).

7. The slope-based circulating gravity energy storage system according to any one of claims 1 to 5, characterized in that: The upper warehouse rail shelf (41) and the lower warehouse rail shelf (42) further include a base (44), an auxiliary limit frame (43) is arranged on the base (44), and the base (44) has a passage in the middle, and the upper warehouse section rail (21) and the lower warehouse section rail (23) pass through the passage of the base (44).

8. The slope-based circulating gravity energy storage system according to any one of claims 1 to 5, characterized in that: Each row of auxiliary limit frames (43) includes transverse steel structures and vertical steel structures, which are connected to form a mesh structure, and the spacing distances between the transverse steel structures and the spacing distances between the vertical steel structures match the size of the weight block (60).

9. A method for operating a slope-based circulating gravity energy storage system, characterized in that: It is implemented by using a slope-based circulating gravity energy storage system according to any one of claims 2 to 5; Under energy storage conditions, the following processes are included: In the low altitude area (13), the lower warehouse handling equipment (52) takes the heavy object (60) out of the lower warehouse track shelf (42) and loads it onto the conveyor vehicle (30) on the lower warehouse section track (23); the conveyor vehicle (30) loaded with the heavy object (60) runs toward the slope (12) and adjusts its speed to the same speed as the uphill working section chain conveyor (221); after reaching the position of the working section chain conveyor (221), the conveyor vehicle (30) is connected to the second connecting and disconnecting component of the working section chain conveyor (221) through the first connecting and disconnecting component, and then the conveyor vehicle (30) turns off its own power and is pulled uphill by the working section chain conveyor (221) to the high altitude area (11); After the transport vehicle (30) reaches the position of the upper warehouse section track (21), it is disconnected from the working section chain conveyor (221), and at the same time, the transport vehicle (30) recovers its own power and runs along the upper warehouse section track (21) to the upper warehouse track shelf (41) and stops; the upper warehouse handling equipment (51) lifts the heavy object (60) on the transport vehicle (30) and places it on the upper warehouse track shelf (41); the empty transport vehicle (30) continues to run to the position of the return section track (24), and then connects to the second connecting and disconnecting component of the return section chain conveyor (241) through the first connecting and disconnecting component, shuts down its own power, and is pulled to the low altitude area (13) by the return section chain conveyor (241); After the transport vehicle (30) reaches the position of the lower warehouse section track (23), it is disconnected from the return section chain conveyor (241), and at the same time the transport vehicle (30) recovers its own power, runs along the lower warehouse section track (23) to the lower warehouse track shelf (42) and stops to wait for the next heavy object (60) to be loaded; Each transport vehicle (30) repeats the above process, and multiple transport vehicles (30) run continuously and sequentially on the circular transport track to continuously transport the required number of heavy blocks (60) in the lower warehouse track shelf (42) to the upper warehouse track shelf (41) for storage; Under power generation conditions, the following processes are included: In the high altitude area (11), the upper warehouse handling equipment (51) takes the heavy object (60) out of the upper warehouse track shelf (41) and loads it onto the conveyor vehicle (30) on the upper warehouse section track (21); the conveyor vehicle (30) loaded with the heavy object (60) runs toward the slope (12) and adjusts its speed to the same speed as the downhill working section chain conveyor belt (221); after reaching the position of the working section chain conveyor belt (221), the conveyor vehicle (30) is connected to the second connecting and disconnecting component of the working section chain conveyor belt (221) through the first connecting and disconnecting component, and then the conveyor vehicle (30) turns off its own power, slides downward under the action of gravity, and drives the working section chain conveyor belt (221), driving the power generation equipment to generate electricity, and converting the gravitational potential energy into electrical energy; After the transport vehicle (30) reaches the position of the lower warehouse section track (23), it is disconnected from the working section chain conveyor (221), and at the same time, the transport vehicle (30) recovers its own power and runs along the lower warehouse section track (23) to the lower warehouse track shelf (42) and stops; the lower warehouse handling equipment (52) lifts the heavy object (60) on the transport vehicle (30) and places it on the lower warehouse track shelf (42); the empty transport vehicle (30) continues to run to the position of the return section track (24), and then connects to the second connecting and disconnecting component of the return section chain conveyor (241) through the first connecting and disconnecting component, shuts down its own power, and is pulled to the high altitude area (11) by the return section chain conveyor (241); After the transport vehicle (30) reaches the position of the upper warehouse section track (21), it is disconnected from the return section chain conveyor (241), and at the same time the transport vehicle (30) recovers its own power, runs along the upper warehouse section track (21) to the upper warehouse track shelf (41) and stops to wait for the next heavy object (60) to be loaded; Each transport vehicle (30) repeats the above process, and multiple transport vehicles (30) run continuously and sequentially on the circular transport track to continuously lower the required number of heavy blocks (60) from the upper warehouse track shelf (41) and transport them to the lower warehouse track shelf (42) for storage; In the energy storage working condition and the power generation working condition, when taking out and placing the heavy object block (60), the single movement process of the heavy object block (60) only moves in one direction of the horizontal and vertical directions, and after reaching the middle set position, it turns to move in the other direction, and finally reaches the required taking-out position or placement position, and during the transportation and movement process, the universal ball (61) on at least one side of the heavy object block (60) is always in contact with the auxiliary limit frame (43).

10. The operating method of the slope-based circulating gravity energy storage system according to claim 9, characterized in that: Under power generation conditions, when a conveyor vehicle (30) loaded with a heavy object (60) is about to leave the working section chain conveyor belt (221) near the low altitude area (13), another conveyor vehicle (60) loaded with a heavy object (60) is about to enter the working section chain conveyor belt (221) at the same time in the high altitude area (11); And / or, the working section chain conveyor (221) and the return section chain conveyor (241) are both provided with a chain conveyor detection and monitoring system for monitoring the operating status of the chains and chain guide wheels of the working section chain conveyor (221) and the return section chain conveyor (241), wherein the detected operating status includes the tensioning status of the chain and whether the chain and the chain guide wheel are faulty. If an abnormal operating status is detected, the slope-based circulating gravity energy storage system automatically shuts down and issues an alarm message.

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