Lower bin type for gravity energy storage system

Abstract

The utility model discloses a lower bin type for a gravity energy storage system, which comprises a buffer area roadway connected with a lifting channel, a conveyor for transporting heavy blocks is arranged in the buffer area roadway, and a buffer position for temporarily storing the heavy blocks is arranged in the buffer area roadway; the end, far away from the lifting channel, of the cache region roadway is connected with a main transportation roadway, a plurality of sub transportation roadways are connected in parallel in the length direction of the main transportation roadway, and the sub transportation roadways are connected through sub vehicle transfer roadways; a transportation sub-vehicle for transporting heavy blocks and a heavy block storage rack are arranged in the transportation sub-roadway; a main transport vehicle for transporting heavy blocks or transporting a secondary transport vehicle carrying the heavy blocks is arranged in the main transport roadway; and a transfer mother vehicle for transporting the transportation son vehicles among different transportation son roadways is arranged in the son vehicle transfer roadway. According to the scheme, the total path, the total time, the total energy consumption and the construction cost of weight block transportation are reduced, and the charging and discharging efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of gravity energy storage power generation, and particularly relates to a lower bin type for a gravity energy storage system. BACKGROUND

[0002] As a new energy storage scheme, the promotion of the gravity energy storage project is gradually increased, and it is expected that there will be explosive growth in the next two years. As a commercialized and engineered power engineering, whether the gravity energy storage project can be successful depends on the energy conversion efficiency, and under the condition that the total system capacity is certain, it depends on the energy consumption of each subsystem. Secondly, the construction cost of the lower bin accounts for a large proportion in the cost of the vertical shaft type gravity energy storage project, which can be up to more than 15%. In the case of a determined heavy block, the utility model aims to find a lower bin type with low energy consumption and low construction cost in the transportation process.

[0003] As a new energy storage scheme, there is no case of putting into operation in China, and the first gravity energy storage project in China is under construction. Based on the vertical shaft (vertical shaft) energy storage, the vertical shaft is used as the energy storage heavy block conveying channel. There is no practical engineering application case at home and abroad, but there are several patents. For example, the patents of the Institute of Electrical Engineering of the Chinese Academy of Sciences, such as "composite energy storage system based on deep well", "automatic connection and parking system for multiple heavy gravity energy storage", and the patent of China Coal Energy Research Institute Co., Ltd. "Gravity energy storage system based on mine vertical shaft, lifting and transportation system", all use vertical shaft as an energy storage scheme, but the above patents do not involve the research on the storage mode of heavy blocks, and the lower bin part will have the problems of high construction cost and low efficiency. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model is to provide a lower bin type for a gravity energy storage system, to solve the problem of poor lower bin structure of the existing scheme, and to realize a lower bin arrangement form with relatively short path, relatively low energy consumption and low civil engineering cost, that is, a heavy block storage mode.

[0005] The utility model provides a lower bin type for gravity energy storage system, and the gravity energy storage system includes a lifting channel, and the lower bin includes a buffer area tunnel connected with the lifting channel, a conveyor for transporting heavy blocks is arranged in the buffer area tunnel and has a buffer position for temporarily storing the heavy blocks, the buffer area tunnel is connected with a transportation main tunnel at one end far from the lifting channel, a plurality of transportation sub tunnels are connected side by side at a plurality of different positions in the length direction of the transportation main tunnel, and the plurality of transportation sub tunnels are connected through a sub vehicle transfer tunnel, a transportation sub vehicle for transporting the heavy blocks is arranged in the transportation sub tunnel, and a heavy block storage rack for storing the heavy blocks is arranged in the transportation sub tunnel, a transportation mother vehicle for transporting the heavy blocks or the transportation sub vehicle carrying the heavy blocks is arranged in the transportation main tunnel, and a transfer mother vehicle for transferring the transportation sub vehicle between different transportation sub tunnels is arranged in the sub vehicle transfer tunnel.

[0006] Further, in the transportation sub tunnel, one heavy block storage rack has two rows of support bodies arranged in the length direction, and a sub vehicle track for the transportation sub vehicle to travel is arranged between the two rows of support bodies.

[0007] Further, two heavy block storage racks and two groups of sub vehicle tracks are arranged side by side in one transportation sub tunnel.

[0008] Further, a mother vehicle track for the transportation mother vehicle to travel is arranged in the transportation main tunnel in the length direction, and for the transportation mother vehicle for transporting the transportation sub vehicle, a sub vehicle transportation carrying track for the transportation sub vehicle to travel is arranged on the transportation mother vehicle.

[0009] Further, a transfer track for the transfer mother vehicle to travel is arranged in the sub vehicle transfer tunnel, the sub vehicle track extends into the sub vehicle transfer tunnel at the end connected with each transportation sub tunnel to form a sub vehicle track extension, a sub vehicle transfer carrying track for the transportation sub vehicle to travel is arranged on the transfer mother vehicle, and the sub vehicle transfer carrying track can be connected with the sub vehicle track extension.

[0010] Further, two conveyors are arranged side by side in one buffer area tunnel to form two loading and unloading channels.

[0011] Further, a maintenance area is arranged at one end or both ends of the transportation main tunnel in the length direction, and / or a hoisting beam is arranged above the sub vehicle transfer tunnel, and a hoisting device is connected to the hoisting beam.

[0012] Further, a concrete support layer is arranged on the inner side of the buffer area tunnel, the transportation main tunnel, the transportation sub tunnel and the sub vehicle transfer tunnel, and the top of the buffer area tunnel, the transportation main tunnel, the transportation sub tunnel and / or the sub vehicle transfer tunnel is a dome-shaped top.

[0013] Further, the buffer area tunnel, the transportation main tunnel, the transportation sub-tunnel and / or the sub-car transfer tunnel are provided with a pedestrian passage along the length direction.

[0014] Compared with the prior art, the utility model has the beneficial technical effects as follows:

[0015] 1. The lower bin type for the gravity energy storage system reduces the total path, total time and total energy consumption of the heavy block transportation compared with the conventional rectangular warehouse form, and is equipped with an automatic loading and unloading system, so that the heavy block can be continuously, stably and low-energy-consumption operated in the upper bin, thereby improving the charging and discharging efficiency of the whole energy storage system.

[0016] 2. The lower bin type for the gravity energy storage system can adjust the operation parameter capability of each device according to the single weight, quantity and shape of the heavy block, and adjust the most suitable storage path, so as to configure the required storage scheme.

[0017] 3. The purpose of the lower bin system of the gravity energy storage is to store heavy blocks, and the energy consumption in the storage process is low and the construction cost is small. Compared with the prior art (patent), the scheme of the utility model is the most suitable storage scheme for the gravity energy storage system. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic view of the overall overhead structure of the lower bin according to an embodiment of the utility model.

[0019] Figure 2 is a schematic view of the sectional structure of the buffer area tunnel according to an embodiment of the utility model.

[0020] Figure 3 is a schematic view of the sectional structure of the transportation main tunnel according to an embodiment of the utility model.

[0021] Figure 4 is a schematic view of the sectional structure of the transportation sub-tunnel according to an embodiment of the utility model.

[0022] Figure 5 is Figure 4 a schematic view of the size marking of the transportation sub-tunnel structure.

[0023] Figure 6 is a schematic view of the sectional structure of the sub-car transfer tunnel according to an embodiment of the utility model.

[0024] Explanation of reference signs in the drawings:

[0025] 1, lift channel; 2, buffer area roadway; 21, conveyor; 22, buffer site; 23, buffer area roadway concrete support layer; 24, buffer area roadway pedestrian passage; 3, transport main roadway; 31, transport mother car; 32, maintenance area; 33, transport main roadway concrete support layer; 34, transport main roadway pedestrian passage; 4, transport sub-roadway; 41, transport sub-car; 42, heavy block storage rack; 43, transport sub-roadway concrete support layer; 44, transport sub-roadway pedestrian passage; 5, sub-car transfer roadway; 51, transfer mother car; 52, sub-car track extension; 53, sub-car transfer bearing track; 54, hoisting beam; 55, hoisting equipment; 56, sub-car transfer roadway concrete support layer; 6, heavy block. DETAILED DESCRIPTION

[0026] The utility model provides a kind of lower bin type for gravity energy storage system, solve the problem that existing scheme lower bin structure is not good, and then lead to higher cost, lower efficiency, fill the blank of lower bin construction technology in the field of gravity energy storage system, realize a relatively short path, relatively less energy consumption, lower civil engineering cost lower bin arrangement form, i.e.

[0027] Gravity energy storage is through the lifting and falling of heavy block, realizes the cyclic transformation of electric energy, kinetic energy, potential energy, and then realizes the storage and release of electric energy. Please refer to Figure 1 、 Figure 2 The utility model one embodiment of a kind of lower bin type for gravity energy storage system, gravity energy storage system includes lift channel 1, upper bin, lower bin etc., lift channel 1 for example is shaft or slope, heavy block is lifted in lift channel 1 to carry out energy conversion, the upper side (high-altitude area) of lift channel 1 is equipped with upper bin, the lower side (low-altitude area) of lift channel 1 is equipped with lower bin;Gravity energy storage related basic structure and principle are prior art, do not repeat here;The lower bin type of this scheme can be applied to each kind of gravity energy storage system such as shaft type gravity energy storage, slope type gravity energy storage.

[0028] The lower chamber of this utility model is particularly suitable for vertical shaft gravity energy storage systems with one shaft and two units, mainly comprising four parts: a buffer zone, a main transport roadway, a secondary transport roadway, and a secondary vehicle transfer roadway. "One shaft and two units" refers to using one vertical shaft as the lifting channel for two gravity energy storage units. More specifically, each gravity energy storage unit has a lifting container, wire rope, engine, electric motor, or integrated electric generator, etc. The lifting container is used to load and lift heavy objects, and the lifting containers of the two gravity energy storage units share one vertical shaft. Preferably, each gravity energy storage unit has two lifting containers connected to the two ends of the same wire rope. When one lifting container is at the lower chamber height, the other is at the upper chamber height, and vice versa; thus, the two gravity energy storage units have a total of four lifting containers, all located in one vertical shaft; furthermore, the four lifting containers are arranged in a grid pattern, achieving high space utilization.

[0029] The lower compartment includes a buffer area aisle 2 connected to the lifting channel 1. The buffer area aisle 2 is equipped with a conveyor 21 for transporting heavy blocks 6 and forms buffer positions 22 for temporarily storing heavy blocks 6, as well as a loading / unloading channel for loading, unloading, and transporting heavy blocks. The conveyor 21 is preferably, for example, a ground-mounted roller conveyor (a machine that uses steel rollers to carry heavy blocks). For example, multiple conveyors 21 are arranged in segments along the length of the buffer area aisle 2, such as each buffer position 22 being a separate conveyor 21. The conveyors 21 are interconnected, enabling continuous transport of heavy blocks to the lifting channel entrance, and also allowing heavy blocks to be temporarily placed on a buffer position 22. Because the conveyors 21 are multiple segments and relatively independent, for example, when a rear conveyor serves as a buffer position 22 holding a heavy block, the front conveyor 21 can still perform the work of handing over heavy blocks to the transport mother car 31 and moving the heavy blocks. In some alternative embodiments, the buffer position 22 is independent of the conveyor 21, for example, located next to the conveyor 21. The conveyor 21 can transport heavy blocks to the buffer position 22 for temporary storage, and can also transport the temporarily stored heavy blocks back to the conveyor 21 or directly to the elevator shaft entrance through the operation of the buffer position 22 and / or the conveyor 21. In summary, the buffer area lane 2 can be used for transporting and temporarily storing heavy blocks, forming a buffer between the elevator system and the storage system, providing flexible allocation space for system operation. For example, one or more heavy blocks transported to the buffer area can temporarily stay here, waiting for the corresponding components to be in place for subsequent work, thereby effectively improving the transportation efficiency, stability, and safety of the energy storage system.

[0030] The buffer area tunnel 2 is connected with the transportation main tunnel 3 at one end away from the lifting channel 1, and a plurality of transportation sub-tunnels 4 are connected in parallel at different positions in the length direction of the transportation main tunnel 3, and the plurality of transportation sub-tunnels 4 (for example, at one end away from the transportation main tunnel 3) are connected through the sub-car transfer tunnel 5. In other words, the transportation main tunnel 3 and the sub-car transfer tunnel 5 are connected through the transportation sub-tunnel 4 to form a network structure. The transportation sub-tunnel 4 is provided with a transportation sub-car 41 for transporting heavy blocks 6 and a heavy block storage rack 42 for storing the heavy blocks 6. The transportation main tunnel 3 is provided with a transportation mother car 31 for transporting the heavy blocks 6 or the transportation sub-car 41 carrying the heavy blocks 6. The sub-car transfer tunnel 5 is provided with a transfer mother car 51 for transporting the transportation sub-car 41 between different transportation sub-tunnels 4. The transportation sub-car 41, the transportation mother car 31 and the transfer mother car 51 preferably adopt heavy-load RGV cars (rail-guided vehicles). At least the upper part of the transportation sub-car 41 is provided with a lifting device for storing and extracting heavy blocks; the related functional structures and control methods are prior art and will not be described here.

[0031] In the working process of the lower bin, the transportation sub-car 41 can move along the length direction of the transportation sub-tunnel 4 to carry and store or extract the heavy blocks 6. When the transportation sub-car 41 drives to one end close to the transportation main tunnel 3, the work of transferring the heavy blocks 6 with the transportation mother car 31 is performed; or in some embodiments, the transportation sub-car 41 carrying the heavy blocks 6 drives onto / off the transportation mother car 31 as a whole. The transportation mother car 31 can move along the length direction of the transportation main tunnel 3 and can stop at the tunnel entrance of any transportation sub-tunnel 4 and the tunnel entrance of the buffer area tunnel 2 to transfer the heavy blocks. The transfer mother car 51 can move along the length direction of the sub-car transfer tunnel 5 and can stop at the tunnel entrance of any transportation sub-tunnel 4, so that the transportation sub-car 41 can be moved onto the transfer mother car 51, and the transfer mother car 51 can transfer the transportation sub-car 41 thereon to other transportation sub-tunnels 4. Such a design can realize fewer transportation cars, and it is not necessary to provide at least one transportation sub-car 41 in each transportation sub-tunnel 4, for example, after the heavy blocks 6 in one transportation sub-tunnel 4 are carried out, the transportation sub-car 41 in the transportation sub-tunnel 4 can be moved to other transportation sub-tunnels 4 through the transfer mother car 51 for transportation, so that the utilization rate of the equipment is higher and more economical.

[0032] More specifically, Figure 1 , Figure 2In the preferred embodiment shown, two rows of conveyors 21 are arranged side by side in a buffer roadway 2, forming two loading / unloading channels; thus, more heavy blocks can be accommodated, and the buffer capacity is higher. Especially for a one-well two-machine scheme, the two loading / unloading channels correspond to two hoisting container positions respectively, and the loading / unloading and transportation processes are more efficient. Further, the buffer roadway 2 is preferably arranged at the middle of the length direction of the transportation main roadway 3, and the transportation sub-roadways 4 are also arranged on both sides of the middle, and at least two transportation mother vehicles 31 are arranged in the transportation main roadway 3, which can independently perform transportation work. In some embodiments, one buffer roadway 2 is connected to one side of the lifting channel 1, and one buffer roadway 2 is also connected to the other side of the lifting channel 1, for example Figure 1 The structure is symmetrical up and down; and the network structure formed by the roadways is arranged in a horizontal and vertical orthogonal manner; in other feasible embodiments, the buffer roadways 2 are arranged in a plurality of circumferential distribution outside the lifting channel 1, or a plurality of parallel arrangements, the network structure formed by the roadways is a diverging shape, the roadways are curved or broken lines, etc., all of which do not deviate from the utility model concept of the utility model. Optionally, a buffer roadway pedestrian passage 24 is arranged on the inner side wall of each buffer roadway 2 along the length direction, for safe walking in the buffer roadway 2 during construction and maintenance.

[0033] Please refer to Figure 3 The transportation main roadway 3 is provided with a mother vehicle track for the transportation of the transportation mother vehicle 31 along the length direction; preferably, two tracks are arranged to jointly support / guide one (one row) transportation mother vehicle 31. For the transportation mother vehicle 31 used for transporting the transportation sub-vehicle 41, a sub-vehicle transportation carrying track is arranged on the transportation mother vehicle 31 for the transportation of the transportation sub-vehicle 41, and the transportation sub-vehicle 41 can drive onto / off the transportation mother vehicle 31 along the track. Optionally, a transportation main roadway pedestrian passage 34 is arranged on one side of the transportation main roadway 3. The transportation main roadway 3 is relatively narrow, and can basically only accommodate one row of transportation mother vehicles 31 and heavy blocks 6, so that the space utilization rate is relatively high, and the heavy blocks 6 can be moved to both sides of the transportation main roadway 3 to enter the buffer roadway 2 or the transportation sub-roadway 4. Please refer to Figure 1 A maintenance area 32 is arranged at the end of the length direction of the transportation main roadway 3, to park the transportation mother vehicle 31 and the like during maintenance.

[0034] Please refer to Figure 4In the transport sub-passage 4, a heavy block storage rack 42 has two rows of support bodies arranged along the length direction, so that the heavy blocks 6 can be placed on the support bodies, and a sub-vehicle track for the transport sub-vehicle 41 to run is arranged between the two rows of support bodies, and the transport sub-vehicle 41 is located between the two rows of support bodies and below the position where the heavy blocks 6 are placed. Preferably, two heavy block storage racks 42 and two sets of sub-vehicle tracks are arranged side by side in one transport sub-passage 4; each set of sub-vehicle tracks is two parallel tracks. A transport sub-passage pedestrian passage 44 is formed between the two heavy block storage racks 42 (between the two sets of sub-vehicle tracks), and the width of the transport sub-passage pedestrian passage 44 is, for example, 800 mm. This way of storing / transferring two heavy blocks 6 side by side in one passage has the highest space utilization rate, and the specific calculation method will be explained later. There are multiple transport sub-passage 4, for example, arranged in parallel, and the distance between adjacent transport sub-passage 4 is, for example, 15 m.

[0035] Please refer to Figure 6 The sub-vehicle transfer passage 5 is provided with a transfer track for the transfer mother vehicle 51 to run, for example, two parallel tracks. At the connection between the sub-vehicle transfer passage 5 and each transport sub-passage 4, the end of the sub-vehicle track extends into the sub-vehicle transfer passage 5 to form a sub-vehicle track extension 52; of course, for example, there is a support structure below the sub-vehicle track extension 52. The transfer mother vehicle 51 is provided with a sub-vehicle transfer carrying track 53 for the transport sub-vehicle 41 to run, and the sub-vehicle transfer carrying track 53 can be connected to the sub-vehicle track extension 52; that is, when the transfer mother vehicle 51 runs to the passage opening of the transport sub-passage 4, the sub-vehicle transfer carrying track 53 is connected to the corresponding sub-vehicle track extension 52 (there is a small gap between them, which does not affect the function), so that the transport sub-vehicle 41 can run on / off the transfer mother vehicle 51. Further, a hoisting beam 54 is arranged above the sub-vehicle transfer passage 5, and a hoisting device 55 is connected to the hoisting beam 54, for example, the hoisting device 55 is movably arranged on the hoisting beam 54, and the hoisting device 55 is used for the assembly of the lower storage device.

[0036] For vertical shaft gravity energy storage systems, the lower chamber is typically located underground. Underground space construction is more expensive and has more stringent requirements, thus necessitating careful consideration of the lower chamber design. Preferably, the inner surfaces of the buffer zone tunnel 2, main transport tunnel 3, sub-transport tunnel 4, and transfer tunnel 5 are all equipped with concrete support layers (e.g., concrete support layer 23 for the buffer zone tunnel, concrete support layer 33 for the main transport tunnel, concrete support layer 43 for the sub-transport tunnel, and concrete support layer 56 for the transfer tunnel) to ensure compliance with structural and surface requirements. Furthermore, the main cross-section of the buffer zone tunnel 2, main transport tunnel 3, sub-transport tunnel 4, and / or transfer tunnel 5 is rectangular, with an upward-arching dome at the top, matching the vertically shaped rectangular weight block 6 (which is compatible with vertical shaft gravity energy storage, especially with a single shaft and two units), and the arched dome structure provides superior mechanical properties. Pedestrian walkways (e.g., including buffer area walkway 24, main transport walkway 34, and transport sub-walkway 44) are provided along their length in the buffer area roadway 2, main transport roadway 3, and transport sub-walkway 44. The pedestrian walkways can be constructed of steel or concrete structures.

[0037] Regarding the specific design of the tunnel, this utility model provides an optimized design method for the lower chamber type of a gravity energy storage system, especially considering the comparison of construction costs, and specifically includes the following:

[0038] The lower compartment type of this utility model for gravity energy storage system is adopted; heavy blocks are stored in one or more rows in the transport sub-lane, such as... Figure 5 As shown, the heavy block is (or approximately) a cuboid with a (or approximately) rectangular cross-section, and the cross-section of the transport sub-lane is (or approximately) a rectangle with a dome at the top; the area ratio of the heavy block in the cross-section of the transport sub-lane is defined as the cross-sectional area ratio of the heavy block. The higher the cross-sectional area ratio of the heavy block, the greater the storage efficiency and the lower the required lower warehouse construction cost.

[0039] The percentage of the cross-sectional area of ​​the heavy object can be approximately calculated using the following formula:

[0040] K = nab / (dh + πdc / 4);

[0041] In the formula, K is the proportion of the cross-sectional area of ​​the heavy block; n is the number of storage columns of heavy blocks in a tunnel, n=1,2,3,…; a is the width of a heavy block; b is the height of a heavy block; d is the width of the tunnel rectangle, d≥na+(n-1)m, m is the minimum interval between two adjacent columns of heavy blocks (for example, it can be taken as about 0.8 meters); h is the height of the tunnel rectangle; π is pi; c is the height of the dome. It can be understood that the above parameters can be selected as approximate values ​​of the shape (for example, the dome can be approximated as a semi-ellipse), and the mechanical strength of the structure also needs to be considered in the design.

[0042] According to the calculation and analysis, the optimal structure scheme of the lower bin is obtained.

[0043] For example, taking a heavy block with a size of 2m*2m*5m as an example, the calculation results of three forms of a single heavy block (n=1), double heavy blocks (n=2) and three heavy blocks (n=3) in a sub-tunnel cross section are as follows:

[0044] Single heavy block tunnel: the tunnel width is 3m, the height is 5m, the dome height is 1.5m, and the area is about 18.5m²;

[0045] The heavy block cross-sectional area ratio is 10 / 18.5=54%.

[0046] Double heavy block tunnel: the tunnel width is 5.2m, the height is 5m, the dome height is 1.5m, and the area is about 33m²;

[0047] The heavy block cross-sectional area ratio is 20 / 33=60.6%.

[0048] Three heavy block tunnel: the tunnel width is 8m, the height is 5m, the dome height is 2.5m, and the area is about 52m²;

[0049] The heavy block cross-sectional area ratio is 30 / 52=57.7%.

[0050] Therefore, the double heavy block arrangement form of the sub-tunnel has the lowest construction cost, that is, Figure 4 the structure shown in FIG. 1; and Figure 2 compared with the structure shown in FIG. 2, the structure in which only one transportation sub-tunnel pedestrian passage 44 is arranged in the middle has a higher heavy block cross-sectional area ratio; thereby helping to improve the total amount of the heavy blocks 6 that can be stored, improve the ability and flexibility of the gravity energy storage system to continuously store and release energy, on the premise of meeting the requirements of structural strength and operation stability.

[0051] In summary, the lower bin type for the gravity energy storage system of the utility model considers the gravity energy storage engineering application, and the heavy block storage mode designed compared with the conventional rectangular warehouse form will reduce the total path, total time and total energy consumption of heavy block transportation. At the same time, an automatic loading and unloading system is provided to realize the continuous, stable and low-energy-consumption operation of the heavy blocks in the upper bin, thereby improving the charging and discharging efficiency of the entire energy storage system. The lower bin type for the gravity energy storage system of the utility model can adjust the operation parameters of each device according to the single weight, quantity and shape of the heavy blocks according to the engineering needs, and adjust the most suitable storage path to configure the storage scheme required by the engineering. The purpose of the lower bin system of the gravity energy storage is to store heavy blocks, and the energy consumption and construction cost in the storage process are required to be low. Compared with the existing technical scheme (patent), the scheme of the utility model is the most suitable storage scheme for the gravity energy storage system.

Claims

1. A down-pit version for a gravitational energy storage system comprising a lift channel (1), characterized in that, The lower bin comprises a buffer area roadway (2) connected with the lifting channel (1), the buffer area roadway (2) is provided with a conveyor (21) for transporting heavy blocks (6) and has a buffer position (22) for temporarily storing the heavy blocks (6); the buffer area roadway (2) is connected with a transportation main roadway (3) at an end away from the lifting channel (1), a plurality of transportation sub-roadways (4) are connected side by side at different positions in the length direction of the transportation main roadway (3), and the plurality of transportation sub-roadways (4) are connected through a sub-car transfer roadway (5); the transportation sub-roadway (4) is provided with a transportation sub-car (41) for transporting the heavy blocks (6) and a heavy block storage rack (42) for storing the heavy blocks (6); the transportation main roadway (3) is provided with a transportation mother car (31) for transporting the heavy blocks (6) or the transportation sub-car (41) carrying the heavy blocks (6); and the sub-car transfer roadway (5) is provided with a transfer mother car (51) for transporting the transportation sub-car (41) between different transportation sub-roadways (4).

2. A downhole version for a gravitational energy storage system according to claim 1, characterized in that, In the transportation sub-roadway (4), one heavy block storage rack (42) has two rows of support bodies arranged in the length direction, and a sub-car track for the transportation sub-car (41) to travel is arranged between the two rows of support bodies.

3. A downhole version for a gravitational energy storage system according to claim 2, characterized in that, Two heavy block storage racks (42) and two groups of sub-car tracks are arranged side by side in one transportation sub-roadway (4).

4. The downhole version of the gravitational energy storage system according to claim 1, characterized in that, The transportation main roadway (3) is provided with a mother car track for the transportation mother car (31) to travel in the length direction; for the transportation mother car (31) for transporting the transportation sub-car (41), a sub-car transportation carrying track for the transportation sub-car (41) to travel is arranged on the transportation mother car (31).

5. The downhole version of the gravitational energy storage system according to claim 2, characterized in that, The sub-car transfer roadway (5) is provided with a transfer track for the transfer mother car (51) to travel; at the connection between the sub-car transfer roadway (5) and each transportation sub-roadway (4), the end of the sub-car track extends into the sub-car transfer roadway (5) to form a sub-car track extension part (52); a sub-car transfer carrying track (53) for the transportation sub-car (41) to travel is arranged on the transfer mother car (51), and the sub-car transfer carrying track (53) can be opposite to the sub-car track extension part (52).

6. A downhole version for a gravitational energy storage system according to any of claims 1-5, characterized in that, Two conveyors (21) are arranged side by side in one buffer area roadway (2) to form two loading and unloading channels.

7. A downhole version for a gravitational energy storage system according to any of claims 1-5, characterized in that, A maintenance area (32) is arranged at one end or both ends of the transportation main roadway (3) in the length direction; and / or a hoisting beam (54) is arranged above the sub-car transfer roadway (5), and a hoisting device (55) is connected to the hoisting beam (54).

8. A downhole version for a gravitational energy storage system according to any of claims 1-5, characterized in that, The inner side surfaces of the buffer area roadway (2), the transportation main roadway (3), the transportation sub-roadway (4) and the sub-car transfer roadway (5) are provided with a concrete support layer; the top of the buffer area roadway (2), the transportation main roadway (3), the transportation sub-roadway (4) and / or the sub-car transfer roadway (5) is a dome-shaped top that arches upward.

9. A downhole version for a gravitational energy storage system according to any of claims 1-5, characterized in that, A pedestrian channel is arranged in the buffer area roadway (2), the transportation main roadway (3), the transportation sub-roadway (4) and / or the sub-car transfer roadway (5) in the length direction.

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