Vertical shaft gravity energy storage system based on gear rack steel wire rope composite lifting

Abstract

The invention discloses a vertical shaft gravity energy storage system based on gear rack steel wire rope composite lifting. The vertical shaft gravity energy storage system comprises a lifting system and a driving system. The lifting system is a multi-rope friction type lifting system and comprises a lifting roller, a friction head sheave and a steel wire rope in transmission connection with the lifting roller and the friction head sheave, the two tail ends of the steel wire rope are connected with the two cages respectively, and the two cages are located in two shaft ways of the vertical shaft respectively. A lower bin is arranged at the lower part of the vertical shaft; the driving system comprises an electric power generation all-in-one machine and a gear rack driving motor, the electric power generation all-in-one machine is in transmission connection with the lifting roller, and the gear rack driving motor is in transmission connection with a gear; vertical racks are arranged on the well walls on the two opposite sides in each well, a gear and rack driving motor is arranged on the cage, and a gear is meshed with the racks. According to the invention, the stability and safety are ensured through cooperation of multiple motors, and the equipment cost and the maintenance cost are relatively low.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of gravity energy storage power generation, and particularly relates to a vertical shaft gravity energy storage system based on rack and pinion steel wire rope composite lifting. BACKGROUND

[0002] The vertical shaft gravity energy storage has flexible site selection and is suitable for utilizing the idle space of abandoned mines, which can to some extent get rid of the restrictions of geographical conditions and cost problems, and it is of great significance to develop the vertical shaft gravity energy storage. Related prior art such as Chinese patent application publication No. CN115833473A uses a shaft, arranges a rack in the shaft, and uses a rack and pinion to drive the up and down movement of a heavy block to store energy and generate electricity; but the rack and pinion driving mode has the disadvantages of large friction loss at high speed, weak bearing capacity, and high maintenance cost; for example, Chinese patent application publication No. CN117458724A arranges a linear motor generator on the wall to convert the gravitational potential energy of the heavy object into electrical energy during lifting and lowering to realize the process of energy storage and power generation; but the current linear generator has the problems of limited running control precision and energy density due to the gap, and high price. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a vertical shaft gravity energy storage system based on rack and pinion steel wire rope composite lifting, which solves the problem that the existing solutions cannot balance the cost and system stability, and ensures the stability of power generation through the cooperation of multiple motors, ensures the safety of the structure, and has relatively low equipment cost and maintenance cost.

[0004] According to the technical scheme of the present application, a vertical shaft gravity energy storage system based on rack and pinion steel wire rope composite lifting is provided, which includes a lifting system and a driving system; the lifting system is a multi-rope friction type lifting system, which includes a lifting drum, a friction sheave, and a steel wire rope connected in transmission to the lifting drum and the friction sheave, both ends of the steel wire rope are connected to two cages, and the two cages are located in two shafts of a vertical shaft; an upper bin is arranged at the upper part of the vertical shaft, and a lower bin is arranged at the lower part of the vertical shaft; the driving system includes an electric generator integrated machine and a rack and pinion driving motor, the electric generator integrated machine is in transmission connection with the lifting drum, and the rack and pinion driving motor is in transmission connection with a gear; in each shaft, vertical racks are arranged on the opposite two sides of the shaft, the rack and pinion driving motor is arranged on the cage, and the gear is in engagement with the rack.

[0005] In some embodiments, in the energy storage stage, the cage going up carries heavy objects, and the cage going down is empty; the gear rack driving motor on the cage going up and the gear rack driving motor on the electric power generation integrated machine consume electric energy to work, and through the traction of the steel wire rope and the cooperation of the gear and the rack, the cage carrying heavy objects goes up; the gear rack driving motor on the cage going down does not work, and the gear rotates freely, and through the cooperation of the gear and the rack, the cage moves stably; in this way, the heavy objects in the lower warehouse are transported to the upper warehouse, and the electric energy is converted into the gravitational potential energy of the heavy objects; in the power generation stage, the cage going down carries heavy objects, and the cage going up is empty; the cage carrying heavy objects goes down under the action of gravity, and drives the electric power generation integrated machine to generate electricity through the steel wire rope; all the gear rack driving motors do not work, and the gears rotate freely, and through the cooperation of the gear and the rack, the cage moves stably; in this way, the heavy objects in the upper warehouse are transported to the lower warehouse, and the gravitational potential energy of the heavy objects is converted into electric energy.

[0006] In some embodiments, a brake is arranged on the side of the lifting drum.

[0007] In some embodiments, on the opposite two side walls in each shaft, two parallel racks are arranged on each side wall, and two gear rack driving motors are arranged on the top of the cage, and each gear rack driving motor is connected with two gears through a speed reducer, so that each side of the top of the cage has two groups of meshing gears and racks.

[0008] In some embodiments, on the opposite two side walls in each shaft, the racks are symmetrically arranged, and the positions of the racks are arranged centrally relative to the cage.

[0009] In some embodiments, on the opposite two side walls in each shaft, vertical guide rails are arranged on each side wall, and rollers are arranged on the two sides of the cage and matched with the guide rails.

[0010] In some embodiments, a steel structure shaft stand is arranged on the shaft wall, and the racks and the guide rails are arranged on the shaft stand.

[0011] In some embodiments, the lifting drum and the electric power generation integrated machine are arranged in a shaft tower above the shaft, the output shaft of the electric power generation integrated machine is connected with the lifting drum, two steel wire ropes are wound on the lifting drum, and the ends of the two steel wire ropes are connected with the top of the cage in the corresponding shaft after passing through the friction sheave.

[0012] Compared with the prior art, the beneficial technical effects of the present application are as follows: The vertical shaft gravity energy storage system based on the gear rack steel wire rope composite lifting of the application fully utilizes the empty space between the mine shaft and the cage to install a gear rack mechanism under the premise of not affecting the normal operation of the mine steel wire rope lifting system, realizes the conversion of potential energy and electric energy of the heavy block through the composite driving of the steel wire rope and the gear rack, and the redundant driving system formed by the gear rack and the steel wire rope can also improve the safety of the system; compared with the traditional gravity energy storage scheme using the steel wire rope, the scheme increases the gear rack cooperative driving, solves the instability of the traditional driving only relying on the steel wire rope, and the possible mine safety hidden danger; compared with some new type of linear motor gravity energy storage scheme, the scheme solves the high cost problem of the linear motor needing to be arranged on both sides of the shaft wall, and the problems of high-precision arrangement and difficult control of the linear motor; compared with the scheme driven only by the gear rack, the scheme increases the steel wire rope, and the gear rack and the steel wire rope form a double redundant driving system; if the steel wire rope is broken accidentally, the gear rack can still provide power, avoiding the loss of control of the load, and significantly reducing the falling risk; at the same time, the gear rack has high transmission ratio, no slip and accurate positioning, and the cooperative control of the steel wire rope and the gear rack compensates for the problems of large friction loss, weak bearing capacity and high maintenance cost of single gear rack in long distance transmission and high speed operation; the scheme can ensure the stability of power generation and the safety of the structure when multiple motors are cooperatively driven during lifting and lowering, and the gear rack scheme greatly reduces the budget compared with the linear motor. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is the front view structural schematic diagram of the vertical shaft gravity energy storage system provided by the application.

[0014] Figure 2 is the side view structural schematic diagram of the vertical shaft gravity energy storage system provided by the application.

[0015] Figure 3 is the top view structural schematic diagram of the shaft provided by the application.

[0016] Explanation of reference signs in the drawings: 1, lifting drum; 2, friction sheave; 3, steel wire rope; 4, cage; 5, upper bin; 6, lower bin; 7, gear rack driving motor; 8, gear; 9, shaft wall; 10, rack; 11, brake; 12, guide rail; 13, roller; 14, derrick; 15, speed reducer. DETAILED DESCRIPTION

[0017] The application provides a vertical shaft gravity energy storage system based on a gear and rack steel wire rope composite lifting, solves the problem that the existing scheme cannot balance the cost and system stability, and more specifically, solves the problems of the traditional single drive drum long distance transportation steel wire rope self weight being too large, the transportation efficiency being low, the energy consumption being high, the driving being unstable, the single gear and rack transmission power being insufficient, the driving being unstable, the power generation efficiency being low, the cost of the linear motor in the gravity energy storage being high, the control precision being high, and the instability of the traditional single rotating motor. The application ensures the stability of power generation through multi-motor cooperative driving, ensures the safety of the structure, and has relatively low equipment cost and maintenance cost.

[0018] Please refer to Figures 1 to 3 The vertical shaft gravity energy storage system based on the gear and rack steel wire rope composite lifting mainly comprises a lifting system and a driving system. The lifting system is a multi-rope friction type lifting system, and its basic structure and principle are similar to those of the existing mine hoist, which comprises a lifting drum 1, a friction sheave 2, and a steel wire rope 3 connected in transmission with the lifting drum 1 and the friction sheave 2. Two ends of the steel wire rope 3 are connected with two cages 4 respectively, and the two cages 4 are located in two shafts of the vertical shaft respectively. An upper warehouse 5 is arranged at the upper part of the vertical shaft, and a lower warehouse 6 is arranged at the lower part of the vertical shaft. During operation, the two cages 4 move in opposite directions in the respective shafts (i.e. lifting and lowering movements), and the length of the steel wire rope 3 satisfies that when one of the cages is located in the upper warehouse 5, the other cage is located in the lower warehouse 6.

[0019] As a supplementary description, the upper warehouse 5 and the lower warehouse 6 are storage warehouses for storing heavy objects. The high-altitude area where the upper warehouse 5 is located is also provided with an upper warehouse heavy object transfer device to transport the heavy objects between the cage 4 and the upper warehouse 5, so as to realize the loading and unloading of the heavy objects and the storage and output of the heavy objects. Similarly, the low-altitude area where the lower warehouse 6 is located is provided with a lower warehouse heavy object transfer device. The contents related to the heavy object transfer and storage in the gravity energy storage system are not the focus of the improvement of the application, and the existing technology or other feasible schemes can be used, and details are not described herein.

[0020] The driving system comprises an electric motor and generator integrated machine and a gear and rack driving motor 7, forming a double driving system. The electric motor and generator integrated machine is in transmission connection with the lifting drum 1, and can drive the lifting drum 1 to rotate as a motor, and then drive the cage 4 through the steel wire rope 3, and can generate electricity as a generator under the driving of the lifting drum 1. The gear and rack driving motor 7 is in transmission connection with a gear 8, and the gear and rack driving motor 7 is a motor for driving the gear 8 to rotate.

[0021] In each shaft, vertical racks 10 (in the direction of cage lifting and lowering) are installed on opposite side shaft walls 9. A rack and pinion drive motor 7 is mounted on the cage 4, and gears 8 mesh with the racks 10. During the cage's ascent and descent, gears 8 and racks 10 remain engaged. When the rack and pinion drive motor 7 is energized, the gears 8 mesh with the racks 10, providing driving force for the cage 4's movement. When the rack and pinion drive motor 7 is not operating, gears 8 can freely rotate forward or backward with the cage 4. Gears 8 experience minimal or no resistance from the rack and pinion drive motor 7; for example, gears 8 and the rack and pinion drive motor 7 are connected via a coupling-like component, allowing for disconnection when not in operation. The rack and pinion drive can serve as an auxiliary lifting and guiding device, assisting in the lifting and lowering of the cage through rack and pinion meshing.

[0022] This solution enables the following workflow: During the energy storage phase, the upward-moving cage 4 is loaded with heavy objects, while the downward-moving cage 4 is empty. Both the integrated electric generator and the gear and rack drive motor 7 on the upward-moving cage 4 consume electrical energy to operate. Through the traction of the wire rope 3 and the cooperation of the gear 8 and rack 10, the cage 4 carrying heavy objects moves upward. The gear and rack drive motor 7 on the downward-moving cage 4 does not work, and the gear 8 rotates freely. Through the cooperation of the gear 8 and rack 10, the cage 4 moves stably. In this way, the heavy objects in the lower compartment 6 are transported to the upper compartment 5, and the electrical energy is converted into the gravitational potential energy of the heavy objects. During the power generation phase, the descending cage 4 is loaded with heavy objects, while the ascending cage 4 is empty. The cage 4 loaded with heavy objects descends under the action of gravity, and the electric generator is driven by the steel wire rope 3 to generate electricity. All the gear and rack drive motors 7 are not working, and the gears 8 rotate freely. The cage 4 moves stably through the cooperation of the gears 8 and racks 10. In this way, the heavy objects in the upper chamber 5 are transported to the lower chamber 6, and the gravitational potential energy of the heavy objects is converted into electrical energy.

[0023] More specifically, it also includes a braking system, which includes brakes. For example, brakes 11 are provided on the sides (preferably both sides) of the lifting drum 1. Brakes 11 are preferably, for example, external disc brakes, which are connected to a hydraulic station to achieve braking. Preferably, the braking system also includes a stopping device (emergency stopping device).

[0024] Please see Figure 3The preferred structural arrangement is as follows: on each of the opposite sides of the shaft wall 9 within each shaft, two parallel racks 10 are installed on each side of the shaft wall 9. The racks 10 are of equal length to the lifting path of the cage 4. Two gear and rack drive motors 7 are installed on the top of the cage 4, such as permanent magnet synchronous motors. Each gear and rack drive motor 7 is connected to two gears 8 (specifically explosion-proof gears) via a reducer 15, so that each side of the top of the cage 4 has two sets of meshing gears 8 and racks 10. More preferably, the racks 10 are symmetrically arranged on the opposite sides of the shaft wall 9 within each shaft. In other words, the racks 10 are arranged parallel and symmetrically on both sides of the shaft wall, forming two pairs of parallel transmission methods; and the position of the racks 10 is centered relative to the cage 4, so that the force on both sides of the cage 4 is even.

[0025] Furthermore, on each of the opposite sides of the shaft wall 9 within each shaft, a vertical guide rail 12 is provided on each side of the shaft wall 9. The guide rail 12 is specifically a linear slide rail. Rollers 13 are provided on both sides of the cage 4. The rollers 13 match the guide rails 12 to form a guiding device, and the cage 4 moves along the guide rails 12. More specifically, there are four sets of rollers 13, distributed on the outside of the cage 4 at the four corners from a top-down perspective. There are four guide rails 12, located inside the rollers 13. The guide rails 12 have protrusions, and the rollers 13 have grooves. The rollers 13 and guide rails 12 roll in cooperation, and the grooves cooperate with the protrusions for limiting movement. More specifically, a steel structure derrick 14 is provided on the shaft wall 9, and the rack 10 and guide rails 12 are both mounted on the derrick 14.

[0026] like Figure 1 In the specific embodiment shown, the hoisting drum 1 and the integrated electric generator are installed inside the shaft tower above the vertical shaft. The output shaft of the integrated electric generator is connected to the hoisting drum 1. The integrated electric generator is preferably a permanent magnet synchronous motor; optionally, the integrated electric generator is connected to the hoisting drum 1 via a reducer. Two steel wire ropes 3 are wound on the upper and lower sides of the hoisting drum 1. A friction sheave 2 is provided below the hoisting drum 1. The ends of the two steel wire ropes 3 pass over the friction sheave 2 and are connected to the top of the cage 4 in the corresponding shaft. A steel wire rope connector is provided on the top of the cage 4 to connect the steel wire ropes.

[0027] In summary, the vertical shaft gravity energy storage system of this invention is an improvement upon the mine hoist. It adds a gear and rack motor to the top of the cage and uses a combined drive with the hoisting drum to achieve a novel mine gravity energy storage system. Alternatively, the hoisting system of this invention is a new system combining a traditional tower-type multi-rope friction mine hoist with gear and rack assistance. The vertical shaft gravity energy storage system of this invention typically includes a hoisting system, a drive system, and a braking system. The drive system is a coordinated drive of the hoisting drum and the gear and rack mechanism. The hoisting system includes the hoisting drum, the gear and rack mechanism, a friction sheave, and wire ropes. The braking system includes a brake and an emergency stop device. This invention achieves high-precision and high-reliability energy management through optimized gear and rack arrangement. Simultaneously, the heavy load is lifted to a high position through the coordinated action of the gear and rack and wire ropes. The gear and rack ensure precise positioning, and the wire ropes work together to reduce transmission friction losses. Currently, my country faces a severe problem of significant non-fossil energy waste. This invention, based on a gravity turbine improved from a mine hoist, stores electricity generated when energy is plentiful and releases it during peak electricity demand, significantly addressing energy waste and the difficulty of peak grid regulation. This invention has two modes: energy storage and power generation. When energy is abundant, the heavy object in the lower chamber is lifted to the upper chamber for storage via a combination of lifting rollers and gear racks. During this process, the lifting side of both shafts is heavily loaded while the lowering side is unloaded, thus achieving energy storage and converting electrical energy into gravitational potential energy. When power is scarce, the heavy object in the upper chamber is lowered to the lower chamber. During this process, the lowering side of both shafts is heavily loaded while the lifting side is unloaded, thus converting gravitational potential energy into electrical energy.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; obviously, the described embodiments are some embodiments of the present invention, but not all embodiments; based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention; in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other; modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vertical shaft gravity energy storage system based on gear, rack, and wire rope composite hoisting, characterized in that, It includes a hoisting system and a drive system; the hoisting system is a multi-rope friction hoisting system, including a hoisting drum (1), a friction sheave (2) and a wire rope (3) that is connected to the hoisting drum (1) and the friction sheave (2). The two ends of the wire rope (3) are respectively connected to two cages (4), and the two cages (4) are located in two shafts of the vertical shaft respectively; the upper part of the vertical shaft is provided with an upper chamber (5), and the lower part of the vertical shaft is provided with a lower chamber (6). The drive system includes an integrated electric generator and a rack and pinion drive motor (7). The integrated electric generator is connected to the lifting drum (1) and the rack and pinion drive motor (7) is connected to a gear (8). In each shaft, vertical racks (10) are provided on the opposite two sides of the shaft wall (9). The rack and pinion drive motor (7) is installed on the cage (4), and the gear (8) meshes with the rack (10).

2. The vertical shaft gravity energy storage system based on gear, rack, and wire rope composite hoisting as described in claim 1, characterized in that, During the energy storage phase, the upward cage (4) is loaded with heavy objects, while the downward cage (4) is empty. The electric generator and the gear and rack drive motor (7) on the upward cage (4) both consume electrical energy to work. Through the traction of the wire rope (3) and the cooperation of the gear (8) and rack (10), the cage (4) loaded with heavy objects is driven upward. The gear and rack drive motor (7) on the downward cage (4) is not working, and the gear (8) rotates freely. Through the cooperation of the gear (8) and rack (10), the cage (4) moves stably. In this way, the heavy objects in the lower compartment (6) are transported to the upper compartment (5), and the electrical energy is converted into the gravitational potential energy of the heavy objects. During the power generation stage, the descending cage (4) is loaded with heavy objects, while the ascending cage (4) is empty. The cage (4) loaded with heavy objects descends under the action of gravity and drives the electric generator to generate electricity through the wire rope (3). All gear and rack drive motors (7) are not working, and the gears (8) rotate freely. The cage (4) moves stably through the cooperation of the gears (8) and racks (10). In this way, the heavy objects in the upper chamber (5) are transported to the lower chamber (6), and the gravitational potential energy of the heavy objects is converted into electrical energy.

3. The vertical shaft gravity energy storage system based on gear, rack, and wire rope composite hoisting as described in claim 1, characterized in that, A brake (11) is provided on the side of the lifting drum (1).

4. The vertical shaft gravity energy storage system based on gear, rack, and wire rope composite hoisting as described in claim 1, characterized in that, On each of the two opposite well walls (9) in each well, there are two parallel racks (10). Two gear and rack drive motors (7) are installed on the top of the cage (4). Each gear and rack drive motor (7) is connected to two gears (8) through a reducer (15) so that each of the two sides of the top of the cage (4) has two sets of meshing gears (8) and racks (10).

5. The vertical shaft gravity energy storage system based on gear, rack, and wire rope composite hoisting as described in claim 4, characterized in that, On the opposite two sides of the well wall (9) in each well, racks (10) are symmetrically arranged, and the racks (10) are centered relative to the cage (4).

6. The vertical shaft gravity energy storage system based on gear, rack, and wire rope composite hoisting according to any one of claims 1 to 5, characterized in that, On each of the two opposite well walls (9) in each well, a vertical guide rail (12) is provided on each side of the well wall (9), and rollers (13) are provided on both sides of the cage (4), and the rollers (13) are matched with the guide rails (12).

7. The vertical shaft gravity energy storage system based on gear, rack, and wire rope composite hoisting as described in claim 6, characterized in that, A steel structure derrick (14) is installed on the well wall (9), and the rack (10) and guide rail (12) are both installed on the derrick (14).

8. The vertical shaft gravity energy storage system based on gear, rack, and wire rope composite hoisting according to any one of claims 1 to 5, characterized in that, The hoisting drum (1) and the electric generator are installed in the tower above the shaft. The output shaft of the electric generator is connected to the hoisting drum (1). Two steel wire ropes (3) are wound on the upper and lower sides of the hoisting drum (1). The ends of the two steel wire ropes (3) pass over the friction sheave (2) and are connected to the top of the cage (4) in the corresponding shaft.

Images