Water supplementing type fishway inlet device capable of finely regulating and controlling angle and layering flow speed and operation method

Abstract

The invention provides a water supplementing type fishway inlet device capable of finely regulating and controlling angle and layered flow velocity and an operation method, the water supplementing type fishway inlet device comprises a fishway inlet section for entering fish, the fishway inlet section is rotatably mounted at one end of the head of a fishway main body section, and a water supplementing structure is mounted on the fishway main body section; the water supplementing type fishway inlet device is integrated with a vertical layering flow speed regulation and control system, a multi-angle self-adaptive flow guide system, an active flow compensation stabilizing system and an overall liftable maintenance system. The vertical layered accurate regulation and control of the inlet flow velocity can be realized, the space attitude of the inlet section is dynamically adjusted to adapt to the changing hydrotopography, the inlet flow and flow velocity are actively stabilized, and the overall convenient lifting function is achieved to facilitate overhaul and maintenance.

Description

Technical Field

[0001] This invention relates to the field of water conservancy engineering, and in particular to a water replenishment fishway inlet device and its operation method for finely controlling the angle and stratified flow velocity. Background Technology

[0002] Fishways, as crucial ecological facilities for mitigating the obstruction of fish migration caused by water conservancy projects such as dams and weirs, directly determine the overall success rate of fish passage through their inlet section design efficiency. An ideal fishway inlet should continuously provide a flow pattern highly attractive to target fish species and adapt to complex river hydrological changes. However, current mainstream fishway inlet technologies suffer from the following significant drawbacks: existing inlet gates are mostly integral structures, whose opening adjustments can only change the overall average flow velocity across the cross-section, failing to achieve precise, stratified control of the water flow in the vertical direction; the inlet structure is typically fixed in concrete, permanently installed on the riverbank or dam body, making it difficult to adjust with changes in hydrological conditions; its flow rate and velocity are entirely passively dependent on the downstream water level, resulting in drastic flow velocity fluctuations and poor stability; furthermore, traditional underwater gates and components are extremely difficult to repair and maintain once siltation, malfunction, or mechanical damage occurs, leading to low long-term operational reliability. These problems severely restrict the fish-attracting effect and environmental adaptability of fishway inlets. Summary of the Invention

[0003] The purpose of this invention is to provide a water-replenishing fishway inlet device and operating method with precise control of angle and stratified flow velocity. It can achieve precise vertical stratified control of inlet flow velocity, dynamically adjust the spatial attitude of the inlet section to adapt to changing hydrological topography, actively stabilize inlet flow rate and velocity, and has an overall convenient lifting function to facilitate inspection and maintenance.

[0004] To achieve the above-mentioned technical features, the present invention aims to provide a water-replenishing fishway inlet device and operating method with fine-tuned angle and stratified flow velocity control, comprising a fishway inlet section for fish entry, wherein the fishway inlet section is rotatably installed at one end of the head of the fishway main body section, and a water-replenishing structure is installed on the fishway main body section; the water-replenishing fishway inlet device integrates a vertical stratified flow velocity control system, a multi-angle adaptive flow guidance system, an active flow compensation stabilization system, and an overall liftable maintenance system.

[0005] Preferably, the fishway inlet section is provided with a fishway inlet section pivot, a retractable wing wall, a roller shutter, and retractable rollers; the retractable wing wall is rotatably installed at one end of the head of the fishway main body section via the fishway inlet section pivot, and a retractable roller is installed at the bottom end of the head of the retractable wing wall to drive it to rotate around the fishway inlet section pivot; a roller shutter is installed at the open end of the retractable wing wall.

[0006] Preferably, each of the retractable wing walls is provided with slide rails on its upper and lower sides, and the outer wall of the retractable wing wall is also provided with a limiting device for limiting the rotation angle.

[0007] Preferably, the roller shutter gate is provided with a track, a telescopic rod, a control plate, a roller shutter gate pivot, and a guide rail; the guide rail is fixed on the inner wall of the retractable wing wall, the telescopic rod is fixed on the top of the retractable wing wall, the top ends of the telescopic rod are rotatably mounted with a track through the roller shutter pivot, and the track is rotatably mounted with a control plate through the roller shutter gate pivot, the control plate and the guide rail forming a sliding fit.

[0008] Preferably, the retractable roller includes a vertical telescopic rod fixed to the bottom end of the fishway inlet section, a horizontal telescopic rod hinged between the vertical telescopic rod and the bottom end of the fishway inlet section, and a roller mounted on the bottom end of the vertical telescopic rod via a wheel frame and a rotating shaft.

[0009] Preferably, the water replenishment structure in the active flow compensation stabilization system is provided with a water replenishment pipe and a water intake pipe. The inlet of the water intake pipe is connected to the water supply device, and the outlet of the water intake pipe is connected to the water replenishment pipe.

[0010] Preferably, the water supply pipe is supported on the top of the telescopic device, allowing for adjustment of the outlet height.

[0011] Preferably, the main section of the fishway is provided with a partition.

[0012] Another aspect of the present invention provides an operating method for a water-filling fishway inlet device with fine-tuned angle and stratified flow velocity control, comprising the following steps: S1. The operation of the vertical stratified flow velocity control system includes: the control plate extends to the bottom of the fishway under the guidance of the track and the guide rail; the independent control plate can rotate around the roller shutter gate shaft. S2. The operation of the multi-angle adaptive flow guidance system includes: the retractable rollers drive the fishway inlet section to rotate around the fishway inlet section pivot; the retractable wing wall stretches and retracts along the slide rails under the power of the retractable rollers; the retractable rollers operate in multiple directions and at multiple heights under the action of the vertical telescopic rods, horizontal telescopic rods and the retractable roller pivot. S3. The operation of the active flow compensation stabilization system includes: water is drawn from the dam through the water diversion pipeline and replenished to different water layers through the water replenishment pipeline under the action of the expandable device; S4. The operation of the overall liftable maintenance system includes: the roller shutter door rolls to retract the control plate, and the entire system is lifted by the extension and retraction of the telescopic rod.

[0013] The present invention has the following beneficial effects: 1. The fishway inlet section roller shutter gate of this invention adopts a modular structure design. Each gate unit can be independently controlled in angle, thereby achieving precise stratified control of flow velocity at different water layers.

[0014] 2. This invention incorporates a multi-angle adaptive flow guidance system. This system can drive the inlet section to rotate around its axis and displace along a specific path, thereby dynamically changing the angle between the inlet section's axis and the main river's flow direction to adapt to changing topographic and hydrological conditions.

[0015] 3. This invention is equipped with an active flow compensation and stabilization system that draws water from the upstream of the dam. This system draws water from the upstream reservoir to the key area of ​​the inlet section through pipelines, actively and promptly replenishing the flow in the inlet section, effectively maintaining the stability of the set flow velocity at different water layers, and overcoming the impact of downstream water level fluctuations.

[0016] 4. The inlet section roller shutter gate of this invention is designed as a liftable structure. When inspection or maintenance is required, the entire gate module can be lifted above the water surface, facilitating personnel operation and equipment inspection, and effectively avoiding siltation, blockage, or mechanical damage caused by environmental factors. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of a water supply fishway inlet device that allows for precise control of angle and stratified flow velocity.

[0019] Figure 2 This is a top view of the fishway inlet section of a multi-angle adaptive flow guidance system.

[0020] Figure 3 This is a schematic diagram of the overall structure of the fishway inlet section of the vertical stratified flow velocity control system.

[0021] Figure 4 A schematic diagram of the water replenishment structure for an active flow compensation stabilization system.

[0022] Figure 5 This is a schematic diagram of the fishway inlet telescopic section and the liftable system.

[0023] Figure 6 This is a schematic diagram of the roller shutter gate structure for a vertical stratified flow velocity control system.

[0024] Figure 7 This is a 3D view showing the location of the telescopic roller.

[0025] In the diagram: 1. Fishway inlet section; 2. Water supply structure; 3. Fishway main body section; 11. Fishway inlet section pivot; 12. Retractable wing wall; 13. Roller shutter gate; 14. Telescopic roller; 121. Slide rail; 122. Limiting device; 131. Track; 132. Telescopic rod; 133. Control plate; 134. Roller shutter gate pivot; 135. Guide rail; 21. Water supply pipe; 22. Water diversion pipe; 211. Telescopic device; 31. Partition plate; 141. Vertical telescopic rod; 142. Horizontal telescopic rod; 143. Pipeline. Detailed Implementation

[0026] The present invention will be further described in detail below through specific embodiments. These embodiments are intended to enable those skilled in the art to gain a more comprehensive understanding of the present invention, but do not limit the invention in any way.

[0027] Example 1: like Figure 1-7 As shown, a water-replenishing fishway inlet device and its operating method with precise control of angle and stratified flow velocity include a fishway inlet section 1 for fish entry. The fishway inlet section 1 is rotatably installed at one end of the head of the fishway main body section 3, and a water-replenishing structure 2 is installed on the fishway main body section 3. The water-replenishing fishway inlet device integrates a vertical stratified flow velocity control system, a multi-angle adaptive flow guidance system, an active flow compensation stabilization system, and an overall liftable maintenance system. It can achieve precise vertical stratified control of inlet flow velocity, dynamically adjust the spatial attitude of the inlet section to adapt to changing hydrological topography, actively stabilize inlet flow rate and velocity, and has an overall convenient lifting function to facilitate inspection and maintenance.

[0028] Furthermore, the fishway inlet section 1 is equipped with a fishway inlet section pivot 11, a retractable wing wall 12, a roller shutter 13, and retractable rollers 14. The retractable wing wall 12 is rotatably mounted at one end of the head of the fishway main body section 3 via the fishway inlet section pivot 11. The bottom end of the head of the retractable wing wall 12 is equipped with retractable rollers 14 for driving it to rotate around the fishway inlet section pivot 11. The open end of the retractable wing wall 12 is equipped with a roller shutter 13. The fishway inlet section pivot 11 realizes the rotational connection between the inlet section and the main body section, the retractable rollers provide driving power, the retractable wing wall 12 realizes the adjustment of the inlet cross-sectional size, and the roller shutter 13 serves as the installation carrier for the core component of flow rate regulation. The four components work together to form a dynamically adjustable inlet frame.

[0029] During installation, the fishway inlet section 1 is first hinged and fixed to the head of the fishway main body section 3 via the fishway inlet section pivot 11. Then, the retractable roller is assembled to the bottom of the head of the retractable wing wall 12. Finally, the roller shutter 13 is installed at the opening end of the retractable wing wall 12. During operation, the retractable roller starts and drives the retractable wing wall 12 to rotate around the fishway inlet section pivot 11. At the same time, the retractable wing wall 12 can be stretched or retracted as needed, and the roller shutter 13 adjusts its position synchronously with the wing wall.

[0030] In this way, the fishway inlet section 1 breaks through the limitations of traditional fixed concrete inlets. Through dual adjustment of rotation and extension, the inlet section can be adapted to different river widths and water flow directions, providing a stable structural foundation for subsequent multi-angle flow guidance and stratified flow velocity control. The modular assembly of each component makes disassembly and assembly convenient, reducing the difficulty of construction and maintenance.

[0031] Furthermore, each of the retractable wing walls 12 is provided with slide rails 121 on its upper and lower sides, and the outer wall of the retractable wing wall 12 is also provided with a limiting device 122 for limiting the rotation angle. The slide rails 121 provide guiding constraints for the extension and retraction movement of the retractable wing wall 12, ensuring that the trajectory of the wing wall is accurate and without deviation during the extension and retraction process; the limiting device 122 sets the maximum rotation angle of the retractable wing wall 12 around the pivot 11 of the fishway inlet section through mechanical limiting, so as to avoid collision between the wing wall and the surrounding structure or turbulence of the water flow due to excessive rotation.

[0032] When the retractable wing wall 12 needs to be extended or retracted, the movable part of the wing wall slides smoothly along the upper and lower slide rails 121 to achieve precise adjustment of the inlet cross-sectional width. When the retractable roller drives the wing wall to rotate, as the rotation angle increases, the limiting device 122 gradually contacts the fishway main section 3 or the preset limit structure. When the maximum safe rotation angle is reached, the limiting device 122 locks to prevent the wing wall from continuing to rotate.

[0033] The guiding function of the slide rail 121 improves the stability and accuracy of the extension and retraction of the wing wall, avoiding water leakage or flow turbulence caused by wing wall misalignment; the limiting device 122 effectively protects the equipment structure, prevents mechanical damage caused by excessive rotation, and ensures that the water flow state is always within a reasonable range, thus improving the reliability of fish attraction.

[0034] Furthermore, the roller shutter 13 is provided with a track 131, a telescopic rod 132, an adjustment plate 133, a roller shutter shaft 134, and a guide rail 135; the guide rail 135 is fixed on the inner wall of the retractable wing wall 12, the telescopic rod 132 is fixed on the top of the retractable wing wall 12, the track 131 is rotatably installed between the top ends of the telescopic rod 132 through the roller shutter shaft, and the adjustment plate 133 is rotatably installed between the track 131 through the roller shutter shaft 134, and the adjustment plate 133 and the guide rail 135 form a sliding fit.

[0035] With the track 131 as the power core, the overall lifting and lowering of the roller shutter gate 13 is achieved through the telescopic rod 132. The independent angle adjustment of the control plate 133 is achieved through the roller shutter gate pivot 134. The guide rail 135 provides guidance and limit for the lifting and rotation of the control plate 133, ultimately achieving precise blocking and flow rate control of water flow in different water layers.

[0036] When adjusting the vertical stratified flow velocity, the track 131 drive device is activated, and the track 131 drives the control plate 133 to slide up and down along the guide rail 135, accurately delivering the control plate 133 to the target water layer; according to the preset flow velocity requirements of the water layer, the tilt angle of a single control plate 133 is adjusted by the roller shutter gate shaft 134 to change the cross-sectional area of ​​the water flow; when overall lifting and maintenance is required, the telescopic rod 132 is extended, driving the track 131 and control plate 133 to rise as a whole and leave the underwater environment.

[0037] The modular control plate 133 design enables independent flow velocity control at different water layers in the vertical direction, which can accurately match the flow velocity requirements of different migratory fish and greatly improve the fish attraction effect; the cooperation between the track 131 and the guide rail 135 ensures that the control plate 133 runs smoothly and the angle adjustment is precise; the overall lifting function driven by the telescopic rod 132 provides great convenience for equipment inspection and maintenance, avoiding the cumbersome and risky underwater operations.

[0038] Furthermore, the retractable roller 14 includes a vertical telescopic rod fixed to the bottom end of the fishway inlet section 1, a horizontal telescopic rod 142 hinged between the vertical telescopic rod 141 and the bottom end of the fishway inlet section 1, and a roller is mounted on the bottom end of the vertical telescopic rod via a wheel frame and a rotating shaft 143.

[0039] With the telescopic movement of the vertical and horizontal telescopic poles as the core, the rollers can be adjusted in multiple dimensions in vertical height and horizontal position. The rollers provide rotational driving force, which ultimately drives the fishway inlet section 1 to achieve multi-angle rotation and multi-position displacement, adapting to complex hydrological terrain.

[0040] When adjusting the height of the inlet section, the vertical telescopic rod is extended and retracted, driving the roller to move up and down, thereby adjusting the overall elevation of the fishway inlet section 1 to adapt to different water level changes; when adjusting the horizontal position of the inlet section, the horizontal telescopic rod extends and retracts, pushing the roller to move horizontally, and in conjunction with the height adjustment of the vertical telescopic rod, the roller is positioned in multiple directions; when driving the inlet section to rotate, the roller starts to rotate, and under the action of friction, it drives the retractable wing wall 12 to rotate around the fishway inlet section pivot 11 until the preset angle is reached.

[0041] Multi-dimensional telescopic rod adjustment enables the roller to have flexible positioning capabilities, allowing the inlet section to achieve dynamic adjustments at multiple angles and positions, which can accurately adapt to changes in river topography and hydrological fluctuations; the integrated design of the roller's drive and support simplifies the transmission structure and improves the stability and reliability of the equipment operation.

[0042] Furthermore, the water replenishment structure 2 in the active flow compensation stabilization system is provided with a water replenishment pipe 21 and a water intake pipe 22. The inlet of the water intake pipe 22 is connected to the water supply device, and the outlet of the water intake pipe 22 is connected to the water replenishment pipe 21.

[0043] An active water diversion channel is constructed from the upstream of the dam to the fishway inlet section. Water is drawn from a stable upstream water source through water diversion pipeline 22 and transported to the key area of ​​the fishway inlet through water replenishment pipeline 21 to supplement the inlet flow, offset the impact of downstream water level fluctuations on the inlet flow velocity, and achieve flow velocity stability.

[0044] Before starting the system, check the sealing of the connection between the water intake pipe 22 and the water supply device to ensure that the outlet of the water replenishment pipe 21 is aligned with the target water replenishment areas at the fishway inlet. During operation, turn on the water supply device, and the upstream water is transported to the water replenishment pipe 21 through the water intake pipe 22, and then evenly transported to different positions at the fishway inlet by the water replenishment pipe 21 to replenish the water flow. When the downstream water level fluctuation is detected, causing abnormal inlet flow rate, adjust the output flow rate of the water supply device and adjust the water replenishment amount in real time through the water replenishment pipe 21 to maintain a stable inlet flow rate.

[0045] The active water diversion compensation design breaks the limitation of the traditional fishway inlet flow velocity passively relying on the downstream water level. It can respond to hydrological fluctuations in real time, ensure the stability of the inlet flow velocity, and improve the continuity of the fish-attracting effect. The independent pipeline system has good sealing performance, high water flow transportation efficiency, and is easy to inspect and maintain.

[0046] Furthermore, the water supply pipe 21 is supported on the top of the telescopic device 211, allowing for adjustment of the outlet height. The telescopic movement of the telescopic device 211 drives the overall lifting and lowering of the water supply pipe 21, thereby adjusting the height of the outlet and enabling precise delivery of the water supply to different water layers. This, combined with the vertical stratified flow velocity control system, achieves precise and stable flow velocity in each water layer.

[0047] Based on the vertical stratified flow velocity control requirements, the water replenishment height of each water layer is determined; the telescopic device 211 is controlled to extend and retract, driving the water replenishment pipe 21 to move up and down, adjusting the outlet of the water replenishment pipe 21 to the target water layer height; after adjustment, the extension and retraction length of the telescopic device 211 is locked to ensure the stability of the outlet position of the water replenishment pipe 21; during the water replenishment process, the outlet height can be finely adjusted through the telescopic device 211 based on the flow velocity monitoring data to optimize the water replenishment effect.

[0048] The adjustable outlet height design enables the water supply pipe 21 to accurately adapt to the water supply needs of different water layers. It works in conjunction with the vertical stratified flow velocity control system to further improve the accuracy of flow velocity control for each water layer. The telescopic device 211 has a simple structure and flexible adjustment, and can quickly respond to the adjustment needs of water layer water supply height, thereby improving system operating efficiency.

[0049] Furthermore, the main body section 3 of the fishway is provided with a partition 31.

[0050] By constructing a partitioned flow channel within the main section 3 of the fishway using baffle 31, the water flow in the main section is divided into multiple independent flow paths, reducing the degree of water flow turbulence and providing a stable migration channel for fish. Combined with the flow velocity regulation of the inlet section, a continuous and stable fish-attracting flow pattern is formed.

[0051] The baffles 31 are evenly arranged along the length of the main body section 3 of the fishway, dividing the internal space of the main body section into multiple parallel channels. After the water flow regulated by the inlet section enters the main body section, it flows smoothly along each separated channel, avoiding mutual interference between water flows of different water layers. After fish enter from the inlet section, they can migrate stably along the separated channels, reducing migration resistance.

[0052] The partition 31 effectively streamlines the water flow in the main section, reduces water eddies and turbulence, and improves water flow stability; multiple independent channels provide suitable passage options for fish of different sizes and migratory habits, further improving the overall success rate of fish passage.

[0053] Example 2: Another aspect of the present invention provides an operating method for a water-filling fishway inlet device with fine-tuned angle and stratified flow velocity control, comprising the following steps: S1. The operation of the vertical stratified flow velocity control system includes: the control plate 133 extends to the bottom of the fishway under the guidance of the track 131 and the guide rail 135; the independent control plate 133 can rotate around the roller shutter shaft 134. S2. The operation of the multi-angle adaptive flow guidance system includes: using the retractable roller as a power source to drive the fishway inlet section 1 to rotate around the fishway inlet section pivot 11; the retractable wing wall 12 stretches and retracts along the slide rail 121 under the power of the retractable roller; the retractable roller operates in multiple directions and at multiple heights under the action of the vertical telescopic rod, the horizontal telescopic rod and the retractable roller pivot. S3. The operation of the active flow compensation stabilization system includes: water diversion pipeline 22 draws water from the dam and replenishes water to different water layers through water replenishment pipeline 21 under the action of expandable device 211; S4. The operation of the overall liftable maintenance system includes: the roller shutter 13 rolls to retract the control plate 133, and the overall system is lifted by the extension and retraction of the telescopic rod 132.

[0054] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many specific modifications under the guidance of the present invention without departing from the spirit of the invention and the scope of protection of the claims, and these modifications all fall within the scope of protection of the present invention.

Claims

1. A water supply fishway inlet device for precise control of angle and stratified flow velocity, characterized in that, It includes a fishway inlet section (1) for fish to enter, the fishway inlet section (1) is rotatably installed at one end of the head of the fishway main body section (3), and a water replenishment structure (2) is installed on the fishway main body section (3); the water replenishment type fishway inlet device integrates a vertical stratified flow velocity control system, a multi-angle adaptive flow guidance system, an active flow compensation stabilization system and an overall liftable maintenance system.

2. The water supply fishway inlet device for precise control of angle and stratified flow velocity according to claim 1, characterized in that, The fishway inlet section (1) is provided with a fishway inlet section pivot (11), a retractable wing wall (12), a roller shutter (13) and a retractable roller (14); the retractable wing wall (12) is rotatably installed at one end of the head of the fishway main body section (3) via the fishway inlet section pivot (11), and the bottom end of the head of the retractable wing wall (12) is provided with a retractable roller (14) for driving it to rotate around the fishway inlet section pivot (11); the opening end of the retractable wing wall (12) is provided with a roller shutter (13).

3. The water supply fishway inlet device for precise control of angle and stratified flow velocity according to claim 2, characterized in that, Each of the retractable wing walls (12) is provided with slide rails (121) on the upper and lower sides, and the outer wall of the retractable wing wall (12) is also provided with a limiting device (122) for limiting the rotation angle.

4. The water supply fishway inlet device for precise control of angle and stratified flow velocity according to claim 3, characterized in that, The roller shutter gate (13) is equipped with a track (131), a telescopic rod (132), a control plate (133), a roller shutter gate pivot (134), and a guide rail (135). The guide rail (135) is fixed on the inner wall of the retractable wing wall (12), the telescopic rod (132) is fixed on the top of the retractable wing wall (12), the track (131) is rotatably installed between the top ends of the telescopic rod (132) through the roller shutter pivot, and the control plate (133) is rotatably installed between the track (131) through the roller shutter gate pivot (134). The control plate (133) and the guide rail (135) form a sliding fit.

5. The water supply fishway inlet device for precise control of angle and stratified flow velocity according to claim 4, characterized in that, The retractable roller (14) includes a vertical telescopic rod (141) fixed at the bottom of the fish passage inlet section (1), a horizontal telescopic rod (142) is hinged between the vertical telescopic rod (141) and the bottom of the fish passage inlet section (1), and a roller is installed at the bottom of the vertical telescopic rod through a wheel frame and a rotating shaft (143).

6. The water supply fishway inlet device for precise control of angle and stratified flow velocity according to claim 5, characterized in that, The water replenishment structure (2) in the active flow compensation stabilization system is provided with a water replenishment pipe (21) and a water intake pipe (22). The inlet of the water intake pipe (22) is connected to the water supply device, and the outlet of the water intake pipe (22) is connected to the water replenishment pipe (21).

7. The water supply fishway inlet device for precise control of angle and stratified flow velocity according to claim 6, characterized in that, The water supply pipe (21) is supported on the top of the telescopic device (211) and the outlet height can be adjusted.

8. The water supply fishway inlet device for precise control of angle and stratified flow velocity according to claim 7, characterized in that, The main section (3) of the fishway is equipped with a partition (31).

9. The operating method of the water supply type fishway inlet device with fine control of angle and stratified flow velocity as described in claim 7, comprising the following steps: S1. The operation of the vertical stratified flow velocity control system includes: the control plate (133) extends to the bottom of the fishway under the guidance of the track (131) and the guide rail (135); the independent control plate (133) can rotate around the roller shutter gate pivot (134). S2. The operation of the multi-angle adaptive flow guiding system includes: the fish passage inlet section (1) is driven to rotate around the fish passage inlet section pivot (11) by the retractable roller; the retractable wing wall (12) stretches and contracts along the slide rail (121) under the power of the retractable roller; the retractable roller operates in multiple directions and heights under the action of the vertical telescopic rod, the horizontal telescopic rod and the retractable roller pivot. S3. The operation of the active flow compensation stabilization system includes: water diversion pipeline (22) draws water from the dam and replenishes water to different water layers through water replenishment pipeline (21) under the action of the expandable device (211); S4. The operation of the overall liftable maintenance system includes: the roller shutter (13) rolls to retract the control plate (133), and the overall system is lifted by the extension and retraction of the telescopic rod (132).

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