A cable reeling system and a cable reeling method

Abstract

The application discloses a cable winding and unwinding system and method, which is used for winding and unwinding of a cable of a layered water taking device. The layered water taking device comprises a plurality of gate assemblies arranged in an up-down direction. Each of the gate assemblies comprises a door body, at least one door leaf, a driving device for opening or closing the door leaf, and a cable connected with the driving device. The door body comprises a first side door frame and a second side door frame arranged on two sides. The first side door frame and / or the second side door frame is provided with a plurality of wire grooves arranged in the up-down direction and used for penetrating the cable. The cable can be constrained in the wire grooves. The cable winding and unwinding system and method can avoid interference and entanglement between the cables during installation and disassembly and maintenance of the gate assemblies.

Description

Technical Field

[0001] This invention relates to the field of water conservancy and hydropower engineering, and more particularly to a stratified water intake device in the field of water conservancy and hydropower, and further to a cable winding and unwinding system and method in the stratified water intake device. Background Technology

[0002] With economic development and improved living standards, ecological water safety has become an increasingly important issue. Current stratified water intake schemes primarily involve installing multiple overlapping gates in the intake structure to block deeper water layers and only extract surface water. Ecological water safety requires considering factors such as water quality and temperature at different depths of the reservoir, and selectively extracting water from any body of water within a relatively large depth range. Therefore, the development of existing water conservancy and hydropower projects has proposed stratified water intake technology solutions.

[0003] In recent years, the stratified water intake method at the intake of hydropower stations has been gradually adopted. This method allows for the selective intake of different water layers from the reservoir (i.e., upstream) during operation, thereby improving the problem of releasing high-temperature or low-temperature water. It ensures that the water released from upstream maintains the same temperature and / or quality as the water released downstream, effectively mitigating the negative impact of hydropower station water intake on downstream organisms and the aquatic environment, and meeting the requirements of environmental protection design.

[0004] One known stratified water intake device includes multiple gates, each of which can rotate around a vertically arranged axis on one side or in the middle of the gate under the drive of a drive device, thereby selectively opening the gate to the corresponding depth to allow the water of that layer to drain. While the scheme is relatively convenient to operate, this type of tiered water intake device still has at least the following problems: 1. The cables (including power cables, signal cables, etc.) of the multi-layer gate electrical equipment can only be laid and disconnected on the fixed operating platform, and cannot be laid and disconnected at the working position; 2. Each layer of gate electrical equipment has at least one independent cable. The electrical equipment connecting the multi-layer gate to the cable reel cannot share cables, and there can be no transfer or splitting in between; 3. The multi-layer gates are located on the same vertical plane, and the working positions of the electrical equipment of each layer of gates are also on the same vertical plane, which leads to the problem of tangling between the cables of the electrical equipment of each layer of gates; 4. The installation and removal of each layer of gates has a definite sequence, that is, those installed first are removed later because they are at the bottom, and those installed later are removed first because they are at the top. However, how to ensure that the cables of the electrical equipment of each layer of gates do not interfere with each other during the installation and removal process is also an urgent problem to be solved. Summary of the Invention

[0005] In view of the technical problems mentioned in the background art, the present invention provides a cable winding and unwinding system and a cable winding and unwinding method, in order to at least partially solve at least one of the above-mentioned technical problems.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] This invention relates to a cable retraction system for a stratified water intake device. The stratified water intake device includes multiple gate assemblies arranged vertically. Each gate assembly includes a gate body, at least one gate leaf, a drive device for opening or closing the gate leaf, and a cable connected to the drive device. The gate body includes a first side door frame and a second side door frame located on both sides. The first side door frame and / or the second side door frame are provided with multiple cable grooves arranged vertically for passing cables through, and the cables can be constrained in the cable grooves.

[0008] In a further preferred embodiment, when multiple gate assemblies are arranged in the vertical direction, the cable trays of each layer of gate assemblies are connected vertically, and the cables of each layer of gate assemblies are constrained in an independent cable tray.

[0009] In a further preferred embodiment, the wire groove is integrally formed on the outer side of the first side door frame and / or the second side door frame;

[0010] Alternatively, the groove is formed on a groove plate, and the groove plate is fixed to the outside of the first side door frame and / or the second side door frame.

[0011] A further preferred embodiment includes a cover plate for covering the cable tray or at least one crossbar spanning the cable tray to constrain the cable within the respective cable tray.

[0012] In a further preferred embodiment, the cover plate and / or the crossbar are detachable or openable.

[0013] In a further preferred embodiment, the cross-section of the cable trough is C-shaped or Ω-shaped and has a certain degree of elasticity, and the opening width of the cable trough is smaller than the diameter of the cable.

[0014] In a further preferred embodiment, the cable winding and unwinding system further includes at least one cable winding and unwinding device, which includes multiple cable winding and unwinding reels for unwinding or winding cables.

[0015] In a further preferred embodiment, the cable winding and unwinding device also includes a pulley, the pulley having at least one cable clamping groove for guiding the cable on the cable winding and unwinding reel to the gate assembly assembly position.

[0016] This invention also relates to a cable winding and unwinding method, employing the above-mentioned cable winding and unwinding system, comprising the following steps:

[0017] S01, Connect the cable to the gate assembly;

[0018] S02, The first gate assembly is installed and positioned at the bottom of the dam;

[0019] S03, after the second gate assembly is in place on the top platform, the cable of the first gate assembly is constrained in the cable groove of the second gate assembly, and the cable of the first gate assembly can slide in the cable groove of the second gate assembly. Then the second gate assembly is lowered and positioned on top of the first gate assembly.

[0020] S04, after the third gate assembly is in place on the top platform, the cables of the first gate assembly and the second gate assembly are sequentially constrained in different cable grooves of the third gate assembly. The cables of the first gate assembly and the second gate assembly can slide in the cable grooves of the third gate assembly. Then the third gate assembly is lowered and positioned on top of the second gate assembly.

[0021] S05, and so on, until all gate components are installed in place, then all cables extend together from the top of each cable tray of the topmost gate component.

[0022] A further optimized solution involves hoisting the topmost gate assembly to the top platform during maintenance, removing all cables confined in the cable tray of the topmost gate assembly, and then moving that gate assembly away. This process is repeated until all gate assemblies are removed.

[0023] The above-mentioned technical solution of the present invention brings at least the following beneficial technical effects: the cables of the multi-layer gate assembly can be wired and disconnected on the operating platform, and the cables are independent and complete, without any switching or branching. During the installation and disassembly of the gate assembly, there will be no interference or entanglement between the cables. Attached Figure Description

[0024] Figure 1 This is a front view of the overall structure of the stratified water intake device of the present invention;

[0025] Figure 2 This is a front view of a single gate assembly of the stratified water intake device of the present invention;

[0026] Figure 3 for Figure 2 Enlarged view of a section at point B in the middle;

[0027] Figure 4 This is a front view of a single gate assembly after the stratified water intake device of the present invention has been installed in place;

[0028] Figure 5 for Figure 4 Sectional view along the AA direction;

[0029] Figure 6 for Figure 5 Enlarged view of a section at point C;

[0030] Figure 7 This is a partial top view of the first side gate frame of a single gate assembly in a stratified water intake device according to another embodiment of the present invention;

[0031] Figure 8 for Figure 7 Diagram showing the middle cover plate in open position;

[0032] Figure 9 This is a front view of a single gate assembly of a stratified water intake device according to another embodiment of the present invention;

[0033] Figure 10 for Figure 9 Enlarged view of a section at point D;

[0034] Figure 11 This is a partial top view of the first side gate frame of a single gate assembly in a stratified water intake device according to another embodiment of the present invention;

[0035] Figure 12 This is a side view of the cable tensioning device in the cable take-up and untake-down system of the present invention;

[0036] Figure 13 for Figure 12 The cable tensioning device shown is shown in the front view.

[0037] In the diagram: 100-Gate assembly, 1-Gate body, 101-First side gate frame, 1011-Wire trough, 1012-Wire trough plate, 1013-First through hole, 1014-Second through hole, 1015-Cover plate, 10151-Snap fastener, 10152-Rotating shaft, 10153-Snap fastening component, 1016-Horizontal bar, 10161-First horizontal bar, 10162-Second horizontal bar, 1017-Wire trough opening, 102-Second side gate frame, 1021-Wire trough, 1026-Horizontal bar, 10261-First horizontal bar, 10262-Second horizontal bar, 2-Gate leaf, 3-Drive device, 4-Cable, 5-Cable tensioning device, 501-Cable take-up and untake-down reel, 502-Pulley. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and 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.

[0039] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the invention.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0041] like Figure 1 The diagram shown is a schematic diagram of the assembled gate components 100 in the stratified water intake device of the present invention. The gate components 100 are arranged in the vertical direction.

[0042] Further integration Figures 2 to 6 The diagram shows an overall view and a partial view of a single gate assembly 100, wherein each gate assembly 100 includes a gate body 1, a plurality of side-by-side gate leaves 2, a drive device 3 for opening or closing the gate leaves 2, and a cable 4 connected to the drive device 3.

[0043] Furthermore, the door body 1 includes an upper crossbeam, a lower crossbeam, and a first side door frame 101 and a second side door frame 102 located on both sides of the crossbeam. Multiple door leaves 2 arranged side by side along the horizontal direction are located in the door body 1. Each door leaf 2 has a pivot (not shown). The pivot can be located in the middle of the door leaf 2 or on one side of the door leaf 2. The drive device 3 can drive the transmission device (not shown) to drive the pivot of the door leaf 2 to rotate, so that the door leaf 2 can switch between open and closed positions. The drive device 3 can be one of a motor, a push rod motor, a reciprocating motor, an air pump cylinder, etc., and the transmission device can be a worm gear, a connecting rod structure, etc.

[0044] Each gate assembly 100's drive unit 3 is connected to an independent cable 4. This cable 4 may include at least one of the following: a power cable supplying power to the drive unit 3, a signal line transmitting signals, or a control line providing control commands. Of course, the cable can be adjusted as needed and is not limited to the above-mentioned cables. After exiting the drive unit 3 of the gate assembly 100, the cable 4 can connect to power supply, control display, and other equipment on the dam without any intermediate connections or branch lines. When multiple gate assemblies 100 are installed vertically, each gate assembly 100 is connected to an independent cable 4. To avoid tangling among the multiple cables 4, the inability to distinguish which gate assembly 100's drive unit 3 a particular cable 4 is connected to, and mutual interference between the cables 4 during installation and removal of the gate assemblies 100, this invention provides an independent cable groove 1011 or 1021 on each gate assembly 100. The cable grooves on each gate assembly 100 can be continuous or intermittently segmented.

[0045] Furthermore, the wire grooves 1011 and 1021 in this invention can also be wire conduits with notches, and the two are equivalent.

[0046] To minimize the space occupied by additional components in the middle of the door leaf 2 of the door body 1, this invention fully utilizes the first side door frame 101 and the second side door frame 102 on both sides of the door body 1. Specifically, this invention provides multiple vertically arranged wire grooves 1011 on the first side door frame 101, or multiple vertically arranged wire grooves 1021 on the second side door frame 102. During the installation and / or disassembly of the gate assembly 100, and when the gate assembly 100 is in use after installation, the cables 4 can be constrained in the wire grooves 1011 and 1021 to avoid mutual interference or tangling. More preferably, if there are many gate assemblies 100, there will be a corresponding number of cables 4. Therefore, multiple vertically arranged wire grooves 1011 and 1021 can also be provided on both the first side door frame 101 and the second side door frame 102, and the cables 4 can again be constrained in the wire grooves 1011 and 1021 on both side door frames. Figure 1 As shown, when multiple gate assemblies 100 are installed in the vertical direction, the cable trays 1011 and 1021 of each layer of gate assembly 100 are vertically connected, and the cable 4 of each layer of gate assembly 100 is constrained in an independent cable tray 1011 or 1021. Each cable 4 can be constrained in the cable trays of multiple gate assemblies that are vertically connected, or it can be constrained in the cable trays of gate assemblies that are not vertically connected (in which case the cable can be bent between two gate assemblies 100 and cross into other adjacent cable trays).

[0047] The constraint described in this invention refers to the cable being constrained radially (or in terms of cross-sectional direction) along the groove, while the cable can still move up and down along the axial direction of the groove. In this way, each cable is constrained in an independent groove to avoid mutual interference.

[0048] The first side gate frame 101 and / or the second side gate frame 102 are hollow profiles, preferably with a rectangular cross-section. The cable trays can be located on the inner or outer side of the hollow profiles. Of course, to facilitate the installation of the gate assembly and the positioning of the cables in the cable trays, it is preferable that the cable trays 1011 and 1021 are located on the outer side of the first side gate frame 101 and / or the second side gate frame 102. Considering that the gate assembly equipment and operating position are located downstream of the dam, it is more preferable that the cable trays 1011 and 1021 are located on the outer side of the first side gate frame 101 and / or the second side gate frame 102 near the downstream side of the dam.

[0049] Furthermore, the wire troughs 1011 and 1021 can be directly integrally formed on the outside of the first side door frame 101 and / or the second side door frame 102, or the wire troughs 1011 and 1021 can be formed on a separate wire trough plate 1012. That is, the wire troughs 1011 and 1021 are first formed on one side of the wire trough plate 1012, and then fixed to the outside of the first side door frame 101 and / or the second side door frame 102 by welding, snap-fitting, bolting or other methods.

[0050] Furthermore, such as Figure 5 and Figure 6 As shown, the drive device 3 of the gate assembly 100 of the present invention is disposed within the hollow profile of the first side door frame 101 and / or the second side door frame 102. The cable 4 connected to the drive device 3 needs to be led into the wire grooves 1011 and 1021 located on the outer surface of the first side door frame 101 and / or the second side door frame 102. Therefore, at least one first through hole 1013 is provided at the position corresponding to the wire grooves 1011 and 1021 for the cable 4 to pass through the door frame 101 and 102. In the case of the embodiment using a separate wire groove plate 1012, the wire groove plate 1012 is provided with at least one second through hole 1014 corresponding to the first through hole 1013. In this way, the cable 4 located in the first side door frame 101 and / or the second side door frame 102 can pass out from the first through hole 1013 and / or the second through hole 1014, and then continue to be disposed upward along the direction of the wire grooves 1011 and 1021.

[0051] The following details several ways to constrain cables in cable trays. These are just examples and are not limited to any particular method.

[0052] The first method: such as Figure 7 and Figure 8As shown, a cover plate 1015 is provided outside the wire grooves 1011 and 1021 on the outer surface of the first side door frame 101 and / or the second side door frame 102. The cover plate 1015 can be switched between an open position and a closed position. When the cover plate 1015 is open, the corresponding cables 4 can be pushed into the wire grooves 1011 and 1021. When the cover plate 1015 is closed, the cables 4 can be constrained in their respective wire grooves 1011 and 1021 to avoid mutual interference and tangling. Specifically, one side of the cover plate 1015 is pivotally connected to the first side door frame 101 or the second side door frame 102 via a pivot 10152, and the other side is provided with a latching part 10151 that cooperates with the fastening part 10153 of the first side door frame 101 or the second side door frame 102. That is, the cover plate 1015 is similar to a door and can be opened, such as... Figure 8 As shown, it can be closed and locked, as... Figure 7 As shown.

[0053] The second method: such as Figure 9 and Figure 10 As shown, at least one crossbar 1016 or 1026 is provided outside the wire grooves 1011 and 1021 on the outer surface of the first side door frame 101 and / or the second side door frame 102. The crossbar 1016 or 1026 laterally spans all wire grooves 1011 and 1021 and is detachably or switchable between open and closed positions on the first side door frame 101 or the second side door frame 102. The shape of the crossbar is not limited, and its cross-section can be circular, elliptical, rectangular, etc. Preferably, as shown... Figure 9 As shown, the crossbars include at least first crossbars 10161 and 10261 and second crossbars 10162 and 10262, wherein the first crossbars 10161 and 10261 and the second crossbars 10162 and 10262 are spaced apart, and the first crossbars 10161 and 10261 are located near the upper edge of the cable trays 1011 and 1021, and the second crossbars 10162 and 10262 are located near the lower edge of the cable trays 1011 and 1021. In addition, in order to increase the constraint effect of the cables, multiple crossbars 1016 and 1026 are also spaced apart between the first crossbars 10161 and 10261 and the second crossbars 10162 and 10262.

[0054] The third method: such as Figure 11As shown, the cross-sections of cable trays 1011 and 1021 are designed in a C-shape, and they possess a certain degree of elasticity. The width of the opening 1017 in the cable tray is smaller than the diameter of the cable 4, allowing the cable 4 to be pushed into the cable trays 1011 and 1012 under pressure. Furthermore, because the width of the opening 1017 is slightly smaller than the diameter of the cable 4, the cable 4 can be constrained within the cable trays 1011 and 1012. Of course, the cross-sections of cable trays 1011 and 1021 can also be Ω-shaped, similar to the C-shape, and will not be elaborated further. To improve the constraint effect of cable trays 1011 and 1021 on the cable 4, a cover plate 1015 or a crossbar 1016 can be installed outside the C-shaped or Ω-shaped cross-section cable trays 1011 and 1021. The specific installation method is similar to the first or second method described above, and will not be elaborated further.

[0055] Furthermore, to facilitate the installation and disassembly of the gate assembly 100 and the winding and unwinding of the cable 4, the cable winding and unwinding system of the present invention also includes at least one cable winding and unwinding device 5. The cable winding and unwinding device 5 can be installed on the dam, preferably downstream. The cable winding and unwinding device 5 includes multiple cable winding and unwinding reels 501. Each cable winding and unwinding reel 501 corresponds to one cable 4 of the gate assembly 100. The cable winding and unwinding reel 501 is used to unwind or wind the cable 4. That is, during the installation of the gate assembly 100, the cable winding and unwinding reel 501 is used to unwind the cable 4, and during the disassembly of the gate assembly 100, the cable winding and unwinding reel 501 is used to wind the cable 4. Preferably, whether unwinding or winding, the tension of the cable 4 can be controlled by controlling the rotation speed of the cable winding and unwinding reel 501 to keep the cable taut and avoid tangling. Furthermore, since the cable reels 501 are mounted on the frame of the cable winding device 5 and distributed in different positions, and are at a certain distance from the installation position of the gate assembly 100, pulleys 502 are also provided. Each pulley 502 has at least one cable clamping groove, and each groove is assigned to a different cable reel 501 to prevent the cables wound on each reel 501 from becoming tangled and interfering with each other. The pulleys 502 are also used for cable redirection, guiding the cables on the multiple cable reels 501 on the cable winding device 5 to the assembly position of the gate assembly 100.

[0056] The present invention also relates to a method for cable winding and unwinding using the above-described cable winding and unwinding system, specifically comprising:

[0057] S01, Connect the cable to the gate assembly;

[0058] S02, The first gate assembly is installed and positioned at the bottom of the dam;

[0059] S03, after the second gate assembly is in place on the top platform, the cable of the first gate assembly is constrained in the cable groove of the second gate assembly, and the cable of the first gate assembly can slide in the cable groove of the second gate assembly. Then the second gate assembly is lowered and positioned on top of the first gate assembly.

[0060] S04, after the third gate assembly is in place on the top platform, the cables of the first gate assembly and the second gate assembly are sequentially constrained in different cable grooves of the third gate assembly. The cables of the first gate assembly and the second gate assembly can slide in the cable grooves of the third gate assembly. Then the third gate assembly is lowered and positioned on top of the second gate assembly.

[0061] S05, and so on, until all gate components are installed in place, then all cables extend together from the top of each cable tray of the topmost gate component.

[0062] The above describes the cable routing method during the installation of the gate assembly. However, when the gate assembly is being inspected, it needs to be lifted out of the dam one by one.

[0063] First, hoist the topmost gate assembly to the top platform, remove all the cables constrained in the cable tray of the topmost gate assembly, and then remove that gate assembly. Repeat this process until all gate assemblies are removed.

[0064] It should be clarified that the present invention is not limited to the specific structures and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of the present invention.

[0065] It should also be noted that the exemplary embodiments mentioned in this invention describe methods or systems based on a series of steps or apparatus. However, this invention is not limited to the order of the steps described above; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0066] The above description is merely a specific embodiment of the present invention. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A cable retraction system for retracting cables of a stratified water intake device, the stratified water intake device comprising a plurality of gate assemblies (100) arranged vertically, each gate assembly (100) comprising a gate body (1), at least one gate leaf (2), a drive device (3) for opening or closing the gate leaf, and a cable (4) connected to the drive device, each gate leaf (2) having a rotating shaft, the drive device (3) driving a transmission device to rotate the rotating shaft of the gate leaf (2), the transmission device being a worm gear or connecting rod structure, characterized in that, The door (1) includes a first side door frame (101) and a second side door frame (102) located on both sides. The first side door frame (101) and / or the second side door frame (102) are provided with a plurality of wire grooves (1011, 1021) arranged in the vertical direction for passing through cables (4). The cables (4) can be constrained in the wire grooves (1011, 1021). The cable (4) includes at least one of the following: a cable that provides power to the drive device (3), a signal line that transmits signals, and a control line that provides control commands; The drive device (3) is installed in the hollow profile of the first side door frame (101) and / or the second side door frame (102). The cable (4) connected to the drive device (3) is guided in the wire groove (1011, 1021) on the outer surface of the first side door frame (101) and / or the second side door frame (102). When multiple gate assemblies (100) are arranged in the vertical direction, the wire groove (1011, 1021) of each layer of gate assembly (100) is connected vertically. The cable (4) of each layer of gate assembly (100) is constrained in an independent wire groove (1011, 1021). An independent wire groove (1011, 1021) is set for each cable (4) on each gate assembly (100).

2. The cable retraction system according to claim 1, characterized in that, The wire grooves (1011, 1021) are integrally formed on the outside of the first side door frame (101) and / or the second side door frame (102); Alternatively, the groove is formed on a groove plate (1012), which is fixed to the outside of the first side door frame (101) and / or the second side door frame (102).

3. The cable retraction system according to any one of claims 1-2, characterized in that, It also includes a cover plate (1015) for covering the cable trays (1011, 1021) or at least one crossbar (1016) spanning the cable trays to constrain the cable (4) in the respective cable trays (1011, 1021).

4. The cable retraction system according to claim 3, characterized in that, The cover plate (1015) and / or the crossbar (1016) are detachable or openable.

5. The cable retraction system according to any one of claims 1-2, characterized in that, The cross-section of the trough (1011, 1021) is C-shaped or Ω-shaped and has a certain degree of elasticity. The width of the trough opening (1017) is smaller than the diameter of the cable (4).

6. The cable retraction system according to any one of claims 1-2, characterized in that, The cable winding system further includes at least one cable winding device (5), which includes multiple cable winding reels (501) for unwinding or winding cables (4).

7. The cable retraction system according to claim 6, characterized in that, The cable winding and unwinding device (5) also includes a pulley (502), which has at least one cable clamping groove for guiding the cable on the cable winding and unwinding reel to the gate assembly assembly position.

8. A method for cable winding and unwinding, characterized in that, The cable retraction system according to any one of claims 1-7 comprises the following steps: S01, Connect the cable to the gate assembly; S02, The first gate assembly is installed and positioned at the bottom of the dam; S03, after the second gate assembly is in place on the top platform, the cable of the first gate assembly is constrained in the cable groove of the second gate assembly, and the cable of the first gate assembly can slide in the cable groove of the second gate assembly. Then the second gate assembly is lowered and positioned on top of the first gate assembly. S04, after the third gate assembly is in place on the top platform, the cables of the first gate assembly and the second gate assembly are sequentially constrained in different cable grooves of the third gate assembly. The cables of the first gate assembly and the second gate assembly can slide in the cable grooves of the third gate assembly. Then the third gate assembly is lowered and positioned on top of the second gate assembly. S05, and so on, until all gate components are installed in place, then all cables extend together from the top of each cable tray of the topmost gate component.

9. The cable winding and unwinding method according to claim 8, characterized in that, When overhauling the gate components, first hoist the topmost gate component to the top platform, remove all the cables confined in the cable tray of the topmost gate component, and then move that gate component away. Repeat this process until all gate components are moved away.

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