Cage supporting and stabilizing device and method for kilometer-level vertical shaft gravity energy storage system cage

Abstract

The invention discloses a cage supporting and stabilizing device and method for a kilometer-level vertical shaft gravity energy storage system cage. The cage supporting and stabilizing device comprises a shaft bottom cage supporting and stabilizing device, and the shaft bottom cage supporting and stabilizing device comprises a vertical support; the vertical support is connected with a cage supporting table capable of being controlled to ascend and descend, and the upper end of the cage supporting table is a cage supporting face used for making contact with the bottom face of a cage. A cage stabilizing clamp capable of being controlled to be opened and closed is connected to the cage supporting table, the upper portion of the cage stabilizing clamp is higher than the cage supporting face, and the opposite side face of the upper portion of the cage stabilizing clamp is a cage clamping face used for making contact with the side face of a cage. According to the scheme, the cage is supported and stabilized at the starting and ending moments of lifting / lowering in the gravity energy storage / release process, the cage is prevented from swinging when the cage is started and released, and the friction transmission safety of the kilometer-level lifting gravity energy storage system is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of gravity energy storage, and specifically relates to a cage supporting and stabilizing device and method for a kilometer-level shaft gravity energy storage system cage. Background Art

[0002] The shaft-type gravity energy storage technology can realize the stable and controllable conversion of gravitational potential energy and electrical energy by a lifting system that circulates to lift and lower heavy objects. It can flexibly dispatch heavy object blocks for energy storage / discharge, and has the advantages of large application scale, low cost, long service life, long energy storage time, and no self-discharge. The multi-rope friction double-cage lifting system is an important part of a shaft gravity energy storage system, mainly responsible for lifting / lowering heavy objects during the energy storage / discharge process. During the energy storage process, a permanent magnet motor drives the friction wheel to rotate. Through the friction force between the steel wire rope and the friction lining on the friction wheel, it drives the alternating lifting and lowering of the loaded cage and the empty cage, and can efficiently and stably convert electrical energy into gravitational potential energy for storage. As a key component for carrying heavy objects during the operation of the multi-rope friction double-cage lifting system, the smooth operation of the cage directly affects the efficiency of gravity energy storage. Since the shaft is up to a kilometer deep, when the loaded / empty cage is lowered to the bottom of the shaft, the large hanging length of the lifting steel wire rope makes the cage more likely to shake. Moreover, during the energy storage / discharge process, the gravity difference between the loaded cage on one side and the empty cage on the other side is very large, resulting in a large tension difference between the steel wire ropes on both sides when the loaded cage is lifted / lowered instantaneously. At this time, the steel wire rope is extremely likely to slip and the loaded cage has a risk of falling downward. Once the cage falls, it will seriously affect the efficient and safe production of deep mines and cause huge economic losses. Therefore, it is necessary to design a cage supporting and stabilizing device for a kilometer-level shaft gravity energy storage system cage to stabilize the cage when it is lowered to the bottom of the shaft and apply an upward force to it when the loaded cage is lifted instantaneously, while applying a downward force to the empty cage on the other side, reducing the tension difference of the lifting steel wire rope between the loaded cage and the empty cage, ensuring the smooth operation of the cage of the multi-rope friction double-cage lifting system, and is of great significance for improving the working efficiency of the shaft gravity energy storage system.

[0003] The Chinese utility model patent with the patent number 201420394173.1 discloses a cage supporting device for vertical shaft guides, which adopts a hydraulic cylinder structure. The hook of the lifting arm of the support frame arranged in the vertical shaft wellbore is tightly clamped with the clamping groove of the cage support plate, so as to support the cage and limit the upward rebound of the cage at the same time. This solution is only applicable to single-cage hoisting, and the hydraulic cylinder structure makes the working efficiency of the device relatively low. It does not solve the problem of the left-right shaking of the cage, and the flexibility of the device is poor. The Chinese utility model patent with the patent number 201520027753.1 discloses a cage supporting device for mines. The device includes two sets of oppositely arranged cage supporting units. When the container hits the anti-collision beam, through the conduction and closing of the supporting claws in the cage supporting unit and the compression of the disc spring in the piston cylinder, the downward movement of the container is restricted and buffering is achieved. The installation of this device is difficult, and the operation safety is relatively low. Once the supporting claws fail, it will lead to a serious cage dropping accident. The Chinese invention patent with the patent number 201710144173.4 discloses an overwinding buffer cage supporting device and a hydraulic system for a mine vertical shaft hoisting system. The impact when the hoisting container overwinds and collides with the cross beam is reduced through the cross beam buffer part, and the falling distance of the hoisting container when overwinding and falling is reduced through the hydraulic cage supporting part. However, this solution has a single function. The passive cage supporting causes the cage to hit the cross beam, shortening the service life of the device, and there are problems such as operation safety. The Chinese utility model patent with the patent number 202120888672.6 discloses a buffer cage supporting device for mines, which adopts a pneumatic buffer device and an early contact structure. When the container in the vertical shaft hoisting system has an overwinding, the buffer effect is increased by using pneumatic shock absorption, effectively protecting the anti-collision beam. However, this solution has problems such as low service life of the device, slow response speed, and operation safety and reliability. Therefore, the devices of the above-mentioned prior arts do not consider the anti-slip performance and stability of the cage at the moment of hoisting / lowering, and only consider the cage supporting and buffering of the container after overwinding. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide a cage supporting and stabilizing device and method for a kilometer-level vertical shaft gravity energy storage system, to solve the problems that the cage of the kilometer-level vertical shaft gravity energy storage system is prone to shaking, and there are risks of slipping and falling, and to realize a cage supporting and stabilizing device for a kilometer-level vertical shaft gravity energy storage system with a simple structure, complete functions, simple operation, and fast response, which can flexibly and actively support and stabilize the cage. By dynamically adjusting the tension of the hoisting steel ropes at the heavy load end and the light load end at the start and end moments of hoisting / lowering, it is possible to avoid the slipping of the hoisting steel ropes and the friction linings on the friction wheels due to the excessive tension difference between the two sides of the hoisting steel ropes at the start and end moments of hoisting / lowering, and improve the safety of friction drive of the kilometer-level vertical shaft gravity energy storage system.

[0005] According to the technical solution of the present invention, the present invention provides a cage supporting and stabilizing device for a kilometer-level shaft gravity energy storage system, including a bottom supporting and stabilizing device for the cage. The bottom supporting and stabilizing device for the cage includes a vertical support; a cage supporting platform that can be controlled to lift and lower is connected to the vertical support. The upper end of the cage supporting platform is a supporting surface for contacting the bottom surface of the cage; a stabilizing clamp that can be controlled to open and close is connected to the cage supporting platform. The upper part of the stabilizing clamp is higher than the supporting surface, and the opposite sides of the upper part of the stabilizing clamp are clamping surfaces for contacting the side surface of the cage.

[0006] Further, the cage supporting platform is two vertical sliding platforms, which are respectively located on both sides of the vertical support. The vertical support is provided with vertical guide rails, and the vertical sliding platforms are slidably connected to the vertical guide rails.

[0007] Further, the cage supporting platform is connected to the vertical support through a vertical cage supporting linear motor; a vertical magnetic grating encoder is also provided on the vertical support. The vertical magnetic grating encoder includes a vertical magnetic grating scale and a vertical reading head. The vertical magnetic grating scale is fixedly arranged on the vertical support, the vertical reading head is slidably connected to the vertical magnetic grating scale, and the vertical reading head is fixedly connected to the cage supporting platform.

[0008] Further, the stabilizing clamp is two clamping bodies arranged oppositely, which are respectively located on both sides of the vertical support; a horizontal support is extended outwardly on the outer side surface of the cage supporting platform, and a horizontal guide rail is arranged on the horizontal support; on each side of the vertical support, the clamping body is slidably connected to the corresponding horizontal guide rail.

[0009] Further, the stabilizing clamp is connected to the horizontal support through a horizontal cage supporting linear motor; a horizontal magnetic grating encoder is also provided on the horizontal support. The vertical magnetic grating encoder includes a horizontal magnetic grating scale and a horizontal reading head. The horizontal magnetic grating scale is fixedly arranged on the horizontal support, the horizontal reading head is slidably connected to the horizontal magnetic grating scale, and the horizontal reading head is fixedly connected to the stabilizing clamp.

[0010] Further, a bottom support beam is arranged in the shaft wellbore, and the bottom cage supporting and stabilizing device is arranged on the bottom support beam.

[0011] Further, a tension sensor is also included, and the tension sensor is arranged on the steel wire rope above the cage.

[0012] Further, a wellhead cage pressing device is also included. The wellhead cage pressing device includes a hydraulic lifting rod. The lower part of the hydraulic lifting rod is fixedly connected to the wellhead ground, and the upper part of the hydraulic lifting rod is provided with a transverse telescopic rod extending towards the side close to the cage.

[0013] Furthermore, the shaft gravity energy storage system adopts a multi-rope friction form. Two cage cars are located at both ends of the steel wire rope. When one of the two cage cars is at the wellhead, the other cage car is at the bottom of the well; a tension sensor is provided on the steel wire rope above each cage car; the positions of the bottom cage supporting and stabilizing device and the wellhead cage pressing device correspond to the cage cars.

[0014] According to the technical solution of the present invention, the present invention also provides a working method for the cage supporting and stabilizing device of a kilometer-level shaft gravity energy storage system. It adopts the above-mentioned shaft gravity energy storage system, and includes the following steps during energy storage: Step S1, the initial state is that the cage supporting platform is in the lowered state and the cage stabilizing clamp is in the open state. When the empty cage car on one side of the two cage cars is lowered to the bottom of the well and is about to stop, the cage stabilizing clamp of the bottom cage supporting and stabilizing device moves towards the empty cage car. When the cage stabilizing clamp touches the empty cage car, it stops moving and clamps the cage car to prevent it from shaking. Step S2, after the empty cage car stops stably, keep the cage stabilizing clamp still in the clamped state with the cage car to prevent the cage car from shaking when loading heavy objects. Step S3, after the empty cage car is loaded at the bottom of the well and becomes a loaded cage car, when it is lifted upward, the cage supporting platform and the cage stabilizing clamp move upward together to assist the hoist in lifting the loaded cage car; at the same time, the wellhead cage pressing device presses the empty cage car located at the wellhead on the other side downward through the horizontal telescopic rod; when the tension sensor measures that the tension difference between the steel wire ropes on both sides decreases to the safe range, stop the lifting and pressing actions. Step S4, when the loaded cage car is lifted smoothly upward, the cage stabilizing clamp releases the cage car, and the cage supporting platform and the cage stabilizing clamp move downward together to return to the initial state, and the horizontal telescopic rod of the wellhead cage pressing device retracts.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are as follows: The cage supporting and stabilizing device for the cage car of the kilometer-level shaft gravity energy storage system of the present invention supports and stabilizes the cage car at the beginning and end of lifting / lowering during the gravity energy storage / energy release process, avoiding the swinging of the cage car when starting and releasing the cage car. It can be used to reduce the excessive tension and deformation of the lifting steel wire rope at the heavy load end and increase the too small tension and deformation of the lifting steel wire rope at the light load end by supporting the cage at the beginning and end of lifting / lowering, and avoid the slipping accident of the lifting steel wire rope and the friction lining on the friction wheel due to the too large tension difference between the lifting steel wire ropes on both sides at the beginning and end of lifting / lowering, improving the safety of the friction drive of the kilometer-level lifting gravity energy storage system. Description of the Drawings

[0016] Figure 1 It is the overall structural schematic diagram of a shaft gravity energy storage system provided by the present invention.

[0017] Figure 2It is a schematic three-dimensional structure diagram of the bottom cage supporting and stabilizing device provided by the present invention.

[0018] Figure 3 It is Figure 2 The right view of the bottom cage supporting and stabilizing device shown.

[0019] Figure 4 It is Figure 2 The top view of the bottom cage supporting and stabilizing device shown.

[0020] Figure 5 It is Figure 2 The front view of the bottom cage supporting and stabilizing device in the state of clamping the cage shown.

[0021] Figure 6 It is a schematic structure diagram of the wellhead cage pressing device provided by the present invention in the cage pressing state.

[0022] Figure 7 It is a flow chart of the working method of the device provided by the present invention.

[0023] Explanation of reference numerals in the drawings: 1. Bottom cage supporting and stabilizing device; 11. Vertical support; 12. Cage supporting platform; 121. Vertical guide rail; 122. Vertical cage supporting linear motor; 123. Vertical magnetic grating ruler; 124. Vertical reading head; 125. Vertical slider; 13. Cage stabilizing clamp; 130. Horizontal support; 131. Horizontal guide rail; 132. Horizontal cage supporting linear motor; 133. Horizontal magnetic grating ruler; 134. Horizontal reading head; 135. Horizontal slider; 136. Angle code; 2. Tension sensor; 3. Wellhead cage pressing device; 31. Hydraulic lifting rod; 32. Horizontal telescopic rod; 4. Shaft; 41. Bottom support beam; 5. Cage; 6. Steel wire rope 61. Balance tail rope; 71. Sheave; 72. Friction wheel; 73. Power grid; 8. Heavy object. Detailed implementation manners

[0024] The present invention provides a cage supporting and stabilizing device and method for a kilometer-level shaft gravity energy storage system, specifically a cage supporting and stabilizing device suitable for preventing the steel wire rope from slipping during the start-up, operation and braking stop of the gravity energy storage system, solving the problems that the cage of the kilometer-level shaft gravity energy storage system is prone to shaking and there are risks of slipping and falling, and realizing a cage supporting and stabilizing device for the kilometer-level shaft gravity energy storage system with simple structure, complete functions, convenient operation and rapid response, which can flexibly and actively perform cage supporting and stabilizing operations, and avoid the steel wire rope for hoisting and the friction lining on the friction wheel from slipping due to the excessive tension difference between the heavy-load end and the light-load end of the hoisting steel wire rope at the start and end of hoisting / lowering by dynamically adjusting the tension of the hoisting steel wire rope at the heavy-load end and the light-load end at the start and end of hoisting / lowering, thereby improving the safety of friction drive of the kilometer-level shaft gravity energy storage system.

[0025] Please refer to Figures 1 to 5The present invention provides a tank supporting and stabilizing device for a cage of a kilometer-level vertical shaft gravity energy storage system, comprising a bottom tank supporting and stabilizing device 1. The bottom tank supporting and stabilizing device 1 is arranged at the bottom of the vertical shaft 4 in the gravity energy storage system, and is located directly below the cage 5. The bottom tank supporting and stabilizing device 1 comprises a vertical support 11, to which is connected a tank supporting platform 12 capable of controlled lifting and lowering, the upper end of the tank supporting platform 12 being a tank supporting surface for contacting the bottom surface of the cage 5, the tank supporting surface being able to exert an upward force on the cage 5, and lifting the cage 5 vertically. The tank supporting platform 12 is connected to a tank stabilizing clamp 13 capable of controlled opening and closing, the upper portion of the tank stabilizing clamp 13 being higher than the tank supporting surface, and the opposite side of the upper portion of the tank stabilizing clamp 13 being a tank clamping surface for contacting the side of the cage 5. The tank stabilizing clamp 13 is arranged on the tank supporting platform 12, and the height position of the can clamping surface is relatively fixed with the height position of the tank supporting surface. The tank stabilizing clamp 13 moves up and down with the tank supporting platform 12, and the tank stabilizing clamp 13 can also clamp or release the tank cage 5; the tank stabilizing clamp 13 can clamp the tank cage 5 to maintain the running stability of the tank cage 5 at the moment of lifting.

[0026] In a specific embodiment, the vertical support 11 is in the shape of a vertically arranged square column, and the bottom of the vertical support 11 has a base for fixed connection. The tank holding platform 12 is two vertical slides, and the two vertical slides are respectively located on both sides of the vertical support 11. The vertical support 11 is provided with a vertical guide rail 121, and the vertical slide is slidably connected to the vertical guide rail 121. The vertical slide is generally in the shape of an upright plate, and the upper edge of the vertical slide forms a tank holding surface, or, for example, a horizontal plate or other structure is also connected to the upper edge of the vertical slide as a tank holding surface. Generally, the two vertical slides are raised and lowered synchronously, and the tank holding surfaces at the upper ends are flush, so as to support the tank cage evenly, horizontally, and preferably with a large coverage area. More specifically, two vertical guide rails 121 are respectively provided on each of the left and right sides of the vertical bracket 11, and the tank supporting platform 12, i.e. the vertical slide platform, is fixedly provided with a vertical slider 125 on one side close to the vertical bracket 11. The vertical slider 125 is slidably connected with the vertical guide rail 121 in correspondence and matching manner, thereby ensuring a stable lifting effect.

[0027] The tank support platform 12 is connected with a driving control device, and preferably, for example, the tank support platform 12 is connected to the vertical support 11 through a vertical tank support linear motor 122. More specifically, the vertical tank support linear motor 122 is located between the tank support platform 12 and the vertical support 11 and between two vertical guide rails 121, and the vertical tank support linear motor 122 includes a mover and a stator, the stator is fixedly connected to the vertical support 11, and the mover is fixedly connected to the tank support platform 12.

[0028] Preferably, it also has a displacement sensor or a detection device for monitoring the lifting movement distance and / or position, so as to make the control more accurate and reliable. For example, a vertical magnetic grating encoder is provided on the vertical support 11. The vertical magnetic grating encoder includes a vertical magnetic grating scale 123 and a vertical reading head 124. The vertical magnetic grating scale 123 is fixedly arranged on the vertical support 11. The length direction of the vertical magnetic grating scale 123 is the vertical direction. The vertical reading head 124 is slidably connected to the vertical magnetic grating scale 123, and the vertical reading head 124 is fixedly connected to the can support platform 12 (more specifically, for example, the vertical reading head 124 is fixedly connected to the vertical slider 125). The vertical magnetic grating encoder can be optionally located on the side surface of the vertical support 11 without the can support platform 12, that is, the front and rear side surfaces, for the convenience of spatial layout. The vertical magnetic grating encoder and the vertical can support linear motor 122 are both connected to the control system, and can realize, for example, real-time monitoring of the displacement data of the can support platform 12, accurately running at a set speed, and stopping at a set position.

[0029] In the illustrated embodiment, the can stabilizing clamp 13 is two clamping bodies arranged oppositely. The two clamping bodies are respectively located on both sides of the vertical support 11. In other words, the clamping body is a horizontal slide table. The clamping body is, for example, in a triangular structure. The opposite side surfaces of the two clamping bodies are parallel and both are vertical. This kind of structure is beneficial to the stability of force and the stability of the clamping effect. The can support platform 12 is provided with a horizontal support 130 extending outward on the outer side surface. Specifically, the horizontal support 130 is horizontal and fixedly connected perpendicular to the vertical slide table, and preferably a corner code 136 is fixedly connected at the connection to ensure the structural strength. A horizontal guide rail 131 is provided on the horizontal support 130; on each side of the vertical support 11, the clamping body is slidably connected to the corresponding horizontal guide rail 131. More specifically, the horizontal guide rail 131 is two arranged side by side. A horizontal slider 135 is provided at the bottom of the clamping body, so as to slidably connect corresponding to and matching with the horizontal guide rail 131, enabling the two clamping bodies to move horizontally stably, and generally set to move synchronously, so as to realize the opening and closing actions.

[0030] Similarly, the cage stabilizer clamp 13 is connected to a drive control device, and preferably also has a displacement sensor or a detection device. Specifically, for example, the cage stabilizer clamp 13 and the horizontal support 130 are preferably connected by a horizontal cage-supporting linear motor 132. Preferably, a horizontal magnetic grating encoder is also provided on the horizontal support 130. The vertical magnetic grating encoder includes a horizontal magnetic grating scale 133 and a horizontal reading head 134. The horizontal magnetic grating scale 133 is fixedly arranged on the horizontal support 130, and the length direction of the horizontal magnetic grating scale 133 is the horizontal direction. The horizontal reading head 134 is slidably connected to the horizontal magnetic grating scale 133, and the horizontal reading head 134 is fixedly connected to the cage stabilizer clamp 13 (more specifically, for example, the horizontal reading head 134 is fixedly connected to the horizontal slider 135). The horizontal magnetic grating encoder can be specifically selected to be arranged on the front or rear side of the bottom cage-supporting and stabilizing device 1. Both the horizontal magnetic grating encoder and the horizontal cage-supporting linear motor 132 are connected to the control system, and can detect and control the moving distance of the cage stabilizer clamp 13.

[0031] It can be conceived that using other lifting structures such as scissor lifts can also achieve the lifting of the cage support platform 12, using, for example, hydraulic cylinders can also achieve driving, and using other controllable opening and closing jaw structures can also achieve clamping of the cage, etc.; the present invention preferably adopts the above preferred structural forms, and uses a linear motor as the drive control device, which can make the movement control faster, more accurate and more stable.

[0032] Furthermore, a tension sensor 2 is also included. The tension sensor 2 is arranged on the steel wire rope 6 above the cage 5. The tension sensor 2 is specifically, for example, a side-pressure type tension sensor, which is an existing device. In the embodiment, the side-pressure type tension sensor is fixed to the left and right steel wire ropes by U-shaped bolts. When the steel wire rope is subjected to tension, the force acts on the sensor through the guide pulley to measure the tension of the steel wire rope and then measure the tension difference between the two steel wire ropes, and control according to the situation to avoid slipping of the steel wire rope 6 and the friction lining on the friction wheel 72.

[0033] Please refer to Figure 6 , preferably, a wellhead cage-pressing device 3 is also included, which is arranged in a supporting manner with the bottom cage-supporting and stabilizing device. The wellhead cage-pressing device 3 includes a vertically arranged hydraulic lifting rod 31 (or called a hydraulic push rod). The lower part of the hydraulic lifting rod 31 is fixedly connected to the wellhead ground, and the upper part of the hydraulic lifting rod 31 is provided with a transverse telescopic rod 32 extending towards the side close to the cage 5. The transverse telescopic rod 32 is specifically, for example, a gear-rack telescopic rod. The transverse telescopic rod 32 can move downward with the hydraulic lifting rod 31 to achieve the pressing-down action on the cage 5; it cooperates with the bottom cage-supporting and stabilizing device on the other side through PLC control. While supporting the cage on one side, it presses down the cage on the other side to overcome the potential problem that the cage cannot descend due to insufficient friction.

[0034] Please refer to again Figure 1, the device of the present invention is particularly applicable to this type of gravity energy storage system. The shaft gravity energy storage system adopts a multi-rope friction form. Two cage 5 are respectively located at both ends of the wire rope 6. When one of the two cages 5 is located at the wellhead, the other cage 5 of the two cages 5 is located at the bottom of the well. A balance tail rope 61 is connected below the two cages 5. Among them, the wellhead described in this article corresponds to the upper bin, and the bottom of the well corresponds to the lower bin. Both the upper bin and the lower bin are equipped with a conveying system for loading, unloading, and transporting heavy objects 8, etc. In addition, the gravity turbine used includes two crown blocks 71 and a friction wheel 72 that are drivingly connected through the wire rope 6. The friction wheel 72 is connected to the power grid 73 through a power generation and electric equipment system. This type of multi-rope friction form of gravity energy storage system is prior art. For example, the Chinese invention patent with the publication number CN117886198A previously applied by the applicant. Therefore, the required basic structure and basic working process will not be described in detail. The improvement focus of the present invention is to set the bottom cage supporting and stabilizing device 1 at the bottom of the well, and preferably set a tension sensor 2 on the wire rope and a wellhead cage pressing device 3 at the wellhead to achieve the above-mentioned cage supporting and stabilizing function. Of course, the bottom cage supporting and stabilizing device 1, tension sensor 2 and / or wellhead cage pressing device 3 of the present invention can also be used in other types of gravity energy storage systems.

[0035] More specifically, a tension sensor 2 is provided on the wire rope 6 above each cage 5. The wellhead cage pressing device 3 is symmetrically placed on the wellhead ground. The positions of the bottom cage supporting and stabilizing device 1 and the wellhead cage pressing device 3 correspond to the cage 5. A bottom supporting beam 41 is arranged in the shaft 4 of the shaft. The bottom supporting beam 41 is specifically, for example, two arranged horizontally. The bottom cage supporting and stabilizing device 1 is arranged on the bottom supporting beam 41. In addition, only one wire rope 6 is schematically shown in the figure. Actually, there are multiple wire ropes arranged side by side, forming a multi-rope friction form. And only one gravity energy storage unit (mainly including a set of gravity turbine system and two cages) is shown in the figure. Correspondingly, there are two sets of bottom cage supporting and stabilizing devices 1, tension sensors 2 and wellhead cage pressing devices 3. Actually, it is optional to arrange two or more gravity energy storage units based on one shaft 4, and the corresponding equipment also increases exponentially.

[0036] Based on the above-mentioned shaft gravity energy storage system of the present invention and the preferred scheme of the cage supporting and stabilizing device, the following gives a working method of the cage supporting and stabilizing device for a kilometer-level shaft gravity energy storage system. Taking one gravity energy storage unit and the heavy-load lifting condition (energy storage) as an example, the steps during energy storage are as follows.

[0037] Step S1, the initial state is that the can-carrying platform 12 is in the lowered state and the can-stabilizing clamp 13 is in the open state; when the empty cage on one side of the two cages 5 is lowered to the bottom of the shaft and is about to stop, the can-stabilizing clamp 13 of the bottom can-carrying and stabilizing device 1 moves towards the empty cage. When the can-stabilizing clamp 13 touches the empty cage, it stops moving and clamps the cage 5 to prevent it from shaking. Specifically, for example, the left and right horizontal slides move towards the empty cage from both sides under the drive of the linear motor, and the displacement of the linear motor is controlled by the data fed back by the magnetic grating encoder, so as to realize the required action process. Also, in this step, the can-carrying platform 12 is always in the lowered state, that is, at a certain set low position.

[0038] Step S2, after the empty cage stops stably, keep the can-stabilizing clamp 13 and the cage 5 still in the clamped state to prevent the cage 5 from shaking when loading heavy objects.

[0039] Step S3, after the empty cage 5 finishes loading at the bottom of the shaft and becomes a loaded cage; when lifting upwards, the can-carrying platform 12 and the can-stabilizing clamp 13 move upwards together (specifically, for example, the vertical slides on both sides of the vertical bracket move upwards under the drive of the linear motor), assisting the hoist (i.e., the gravity turbine) to lift the loaded cage; at the same time, the wellhead can-pressing device 3 presses the empty cage located at the wellhead on the other side downwards through the horizontal telescopic rod 32 (specifically including, the horizontal telescopic rod 32 extends above the cage, and then the hydraulic lifting rod 31 performs a downward movement to apply a downward force on the cage 5 by the horizontal telescopic rod 32); when the tension sensor 2 measures that the tension difference between the two steel ropes 6 decreases to a pre-set safe range, the lifting and pressing actions can be stopped. Among them, "stopping lifting" means that the motor stops power supply. After stopping power supply, the can-carrying platform and the can-stabilizing clamp will no longer actively provide power, but at this time the cage is still in the lifted state, so it is allowed for the can-carrying platform and the can-stabilizing clamp to continue moving upwards with the cage for a certain distance; this design not only ensures the smoothness of the cage lifting but also avoids the interference of the can-carrying platform and the can-stabilizing clamp on the cage lifting process.

[0040] Step S4, when the loaded cage is lifted smoothly upwards, the can-stabilizing clamp 13 releases the cage 5 (specifically, for example, the left and right horizontal slides move away from the loaded cage to both sides under the drive of the linear motor), and the can-carrying platform 12 and the can-stabilizing clamp 13 move downwards together to return to the initial state (specifically, for example, the vertical slides on both sides of the vertical bracket move downwards to the initial state), and the horizontal telescopic rod 32 of the wellhead can-pressing device 3 retracts. In other words, this step means that the main motor of the hoist starts to rotate, the cage can be lifted smoothly, and the can-carrying and can-stabilizing functions are cancelled.

[0041] After the loaded cage on this side is lifted to the wellhead for unloading and the empty cage returns again, the cage of the shaft gravity energy storage system uses the cage supporting and stabilizing device to repeat the above steps S1 to S4. In this way, the device of the present invention assists the cage in each energy conversion process of gravity energy storage. It can be understood that during the descending process of the loaded cage (i.e., when releasing energy), similar actions to the above process can be completely or partially adopted to achieve effects such as supporting and stabilizing the cage.

[0042] More specifically, please refer to Figure 7 , in the preferred embodiment, the control system includes a connected PLC, cloud / local server, etc. Each driving and controlling component such as motors, encoders, and the tension sensor are connected to the control system. Through the coordinated control of the PLC, the supporting and stabilizing of the cage by the bottom cage supporting and stabilizing device and the pressing of the cage by the wellhead pressing device are coordinated to work. At the same time, signals such as the wire rope tension difference and (magnetic grid encoder) displacement are obtained in real time, transmitted to the cloud / local server for data storage, data analysis and exchange are realized through the CAN communication protocol, and finally executed by the control system controller. If the tension difference does not meet the safety requirements, the actions of supporting and stabilizing the cage and pressing the cage continue. If the tension difference reaches the safety range, the actions of supporting and stabilizing the cage and pressing the cage stop, and each device returns to the initial state, and then waits to prepare to enter the next cycle.

[0043] In summary, due to the adoption of the above technical solutions, the structure of the present invention supports and stabilizes the cage at the beginning and end of the lifting / lowering process during gravity energy storage / energy release, avoiding the swing of the cage when starting and releasing the cage. It can be used to reduce the excessive tension and deformation of the lifting wire rope at the heavy load end and increase the too small tension and deformation of the lifting wire rope at the light load end by supporting the cage at the beginning and end of lifting / lowering, and avoid the accident of the lifting wire rope slipping on the friction lining of the friction wheel due to the excessive tension difference between the two sides of the lifting wire rope at the beginning and end of lifting / lowering, improving the safety of friction drive of the kilometer-level lifting gravity energy storage system.

[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 described embodiments 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 those of ordinary skill in the art without creative work belong to the scope of protection of the present invention; for the convenience of description, only the parts related to the invention are shown in the drawings. Without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other; modifying the technical solutions recorded in the foregoing embodiments, or equivalently replacing some of the technical features, does not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tank supporting and stabilizing device for a tank cage of a kilometer-level vertical shaft gravity energy storage system, characterized in that: The invention comprises a tank supporting and stabilizing device (1) at the bottom of a well, wherein the tank supporting and stabilizing device (1) comprises a vertical support (11); a tank supporting platform (12) capable of being controlled to rise and fall is connected to the vertical support (11); the upper end of the tank supporting platform (12) is a tank supporting surface for contacting the bottom surface of a tank cage (5); a tank stabilizing clamp (13) capable of being controlled to open and close is connected to the tank supporting platform (12); the upper part of the tank stabilizing clamp (13) is higher than the tank supporting surface; the opposite side of the upper part of the tank stabilizing clamp (13) is a tank clamping surface for contacting the side of the tank cage (5).

2. The tank supporting and stabilizing device for a kilometer-level vertical shaft gravity energy storage system according to claim 1 is characterized in that: The tank supporting platform (12) is two vertical slides, which are respectively located on two sides of the vertical support (11). The vertical support (11) is provided with a vertical guide rail (121), and the vertical slides are slidably connected to the vertical guide rail (121).

3. The tank supporting and stabilizing device for a tank cage of a kilometer-level vertical shaft gravity energy storage system according to claim 2 is characterized in that: The tank supporting platform (12) and the vertical support (11) are connected via a vertical tank supporting linear motor (122); A vertical magnetic grating encoder is also provided on the vertical support (11), and the vertical magnetic grating encoder comprises a vertical magnetic grating scale (123) and a vertical reading head (124). The vertical magnetic grating scale (123) is fixedly provided on the vertical support (11), the vertical reading head (124) is slidably connected to the vertical magnetic grating scale (123), and the vertical reading head (124) is fixedly connected to the tank support platform (12).

4. The tank supporting and stabilizing device for a kilometer-level vertical shaft gravity energy storage system cage according to claim 2 is characterized in that: The tank stabilizing clamp (13) is composed of two clamp bodies arranged opposite to each other, and the two clamp bodies are respectively located on both sides of the vertical bracket (11); the tank supporting platform (12) is provided with a horizontal bracket (130) extending outwardly on the side facing outward, and a horizontal guide rail (131) is provided on the horizontal bracket (130); on each side of the vertical bracket (11), the clamp body is slidably connected to the corresponding horizontal guide rail (131).

5. The tank supporting and stabilizing device for a kilometer-level vertical shaft gravity energy storage system cage according to claim 4 is characterized in that: The tank stabilizing clamp (13) and the horizontal support (130) are connected via a horizontal tank supporting linear motor (132); A horizontal magnetic grating encoder is also provided on the horizontal support (130), and the vertical magnetic grating encoder comprises a horizontal magnetic grating scale (133) and a horizontal reading head (134); the horizontal magnetic grating scale (133) is fixedly provided on the horizontal support (130), the horizontal reading head (134) is slidably connected to the horizontal magnetic grating scale (133), and the horizontal reading head (134) is fixedly connected to the tank stabilizing clamp (13).

6. The tank supporting and stabilizing device for a kilometer-level vertical shaft gravity energy storage system cage according to claim 1 is characterized in that: A well bottom support beam (41) is arranged in the shaft of the vertical shaft (4), and a well bottom tank supporting and stabilizing device (1) is arranged on the well bottom support beam (41).

7. The tank supporting and stabilizing device for a cage of a kilometer-level vertical shaft gravity energy storage system according to any one of claims 1 to 6, characterized in that: It also includes a tension sensor (2), which is arranged on a steel wire rope (6) above the cage (5).

8. The tank supporting and stabilizing device for a kilometer-level vertical shaft gravity energy storage system cage according to any one of claims 1 to 6, characterized in that: It also includes a wellhead tank pressing device (3), which includes a hydraulic lifting rod (31), the lower part of which is fixedly connected to the wellhead ground, and the upper part of which is provided with a transverse telescopic rod (32) extending toward a side close to the tank cage (5).

9. The tank supporting and stabilizing device for a kilometer-level vertical shaft gravity energy storage system according to claim 8 is characterized in that: The vertical shaft gravity energy storage system adopts a multi-rope friction form, wherein two cages (5) are respectively located at the two ends of a steel wire rope (6); when one of the two cages (5) is located at the wellhead, the other of the two cages (5) is located at the well bottom; a tension sensor (2) is provided on the steel wire rope (6) above each cage (5); and the positions of a well bottom tank supporting and stabilizing device (1) and a wellhead tank pressing device (3) correspond to the cages (5).

10. A working method of a tank supporting and stabilizing device for a kilometer-level vertical shaft gravity energy storage system cage, characterized in that: The vertical shaft gravity energy storage system according to claim 9 is used, and the energy storage comprises the following steps: Step S1, the initial state is that the tank support platform is in a lowered state and the tank stabilizing clamp is in an open state. When the empty tank cage on one side of the two tank cages is lowered to the bottom of the well and is about to stop, the tank stabilizing clamp of the tank support and stabilizing device at the bottom of the well moves toward the empty tank cage. When the tank stabilizing clamp contacts the empty tank cage, it stops moving and clamps the tank cage to prevent shaking; Step S2, after the empty cage stops steadily, the cage stabilizing clamp and the cage are kept in a clamping state to prevent the cage from shaking when loading heavy objects; Step S3, the empty cage becomes a loaded cage after loading at the bottom of the well. When lifting upward, the tank support platform and the tank stabilizing clamp move upward together to assist the hoist to lift the loaded cage; at the same time, the wellhead tank pressing device presses down the empty cage at the wellhead on the other side through the transverse telescopic rod; when the tension sensor measures that the tension difference of the wire ropes on both sides is reduced to a safe range, the lifting and pressing actions are stopped; Step S4, when the loaded tank cage is lifted upwards smoothly, the tank stabilizing clamp releases the tank cage, the tank supporting platform and the tank stabilizing clamp move downwards together to return to the initial state, and the transverse telescopic rod of the wellhead tank pressing device is retracted.

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