Fishway entrance fish attracting device and fish attracting method

Abstract

This invention provides a fish-attracting device and method for attracting fish at a fishway entrance to solve the technical problem of unstable water flow velocity at the entrance of a conventional fishway. [Solution] A fish-attracting device for a fishway entrance, comprising two wing walls 1 fixedly installed in a river channel to form a fishway, with fixing plates 3 provided at the fishway entrances of the two wing walls 1, and a frame 2 fixed to one of the wing walls 1. Multiple rotating columns are rotatably connected inside the frame 2, a front plate is provided on the outside of the rotating columns, and an inner shaft is rotatably connected inside, with retaining plates fixed to both sides of the inner shaft, and cavities are provided for the movement of the retaining plates, and multiple sets of holes are provided inside the rotating columns. Multiple sets of sliding columns corresponding to the holes are fixed to both sides of the retaining plates, and a second spring is sleeved between the holes and the retaining plates on the outside of the sliding columns. A first rack is slidably connected to the top of the frame 2, and teeth that interlock with the first rack are provided on the outer top end of the inner shaft.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic engineering, and particularly to a fishway entrance fish attracting device and a fish attracting method.

Background Art

[0002] With the continuous construction of hydraulic engineering works, especially the increase in large-scale hydraulic facilities such as building dams to block rivers, the continuity of rivers has been severely damaged, which has had a significant impact on fish populations in the river ecosystem. The migration of fish is an essential part of the natural ecological cycle, but the construction of dams blocks their migration routes and affects their reproduction and survival. To alleviate this problem, fishways have emerged as auxiliary engineering measures for fish to pass through dams.

[0003] In the existing technology, various measures such as water flow, light, sound, bubble curtain, smell, electric field, etc. are adopted at the fishway entrance to attract or drive migratory fish into the fishway entrance to complete their migration. The extensive application of these technologies has greatly improved the passing efficiency of fish passing facilities and reduced the harm to fish in the overflow dam area.

[0004] The flow velocity of the water at the fishway entrance also affects the migration of fish. If the water flow velocity is too fast, fish may consume a large amount of physical strength during the migration process and may exhaust their physical strength and be unable to continue moving. Especially for fish with a small body length and weak swimming ability, too fast water flow velocity becomes an obstacle to their movement, affecting the movement efficiency of fish and even missing the optimal spawning or foraging opportunities. If the water flow is too slow, fish will be placed in a low-flow velocity state for a long time, which may increase their physiological stress. If the water flow is too slow, fish may not be able to sense the correct migration direction or speed, resulting in hesitation or choosing the wrong route.

[0005] However, the water flow at existing fishway entrances mostly coincides with the river channel flow, resulting in unstable water flow within the river channel. During rainy seasons, the water volume increases and the water velocity increases, while during droughts, the water velocity decreases. Since a stable water flow velocity helps fish to form regular migratory behavior patterns, providing a stable water flow velocity to fishways is a problem that urgently needs to be solved. [Overview of the Initiative]

[0006] The object of the present invention is to overcome the aforementioned shortcomings and solve the technical problem of unstable water flow velocity at existing fishway entrances by providing a fishway entrance fish attracting device and fish attracting method.

[0007] To solve the above technical problems, the present invention employs the following solutions. The fishway entrance fish attracting device includes two wing walls fixed in the river channel to form a fishway, with fixing plates provided at the fishway entrances of the two wing walls, and a frame fixed to one of the wing walls. Multiple rotating columns are rotatably connected inside the frame, a front plate is provided outside the rotating columns, an inner shaft is rotatably connected inside the rotating columns, and retaining plates are fixed to both sides of the inner shaft. A cavity is provided inside the rotating column for the retaining plates to operate, and multiple sets of holes are provided inside the rotating columns. Multiple sets of sliding columns corresponding to the holes are fixed on both sides of the retaining plates, and a second spring is sleeved between the holes and the retaining plates on the outside of the sliding columns. A first rack is slidably connected to the top of the frame, and teeth that interlock with the first rack are provided at the outer top end of the inner shaft. A pressing cylinder is installed on one side of the fixing plate closest to the frame, and a first spring is installed inside the pressing cylinder. The inside of the pressing cylinder is in communication with one end of the pipe. One end of the first rack is slidably fitted with the inner wall of the other end of the pipe via a piston.

[0008] Preferably, the inner shaft is designed to be hollow, and at its bottom it is connected to a water pipe via a joint, with the other end of the water pipe extending to an upstream position. A row of first water holes is provided on the outside of the inner shaft, and a row of second water holes corresponding to the first water holes is provided on the outside of the rotating column.

[0009] Preferably, a limit column is installed at the top of the rotating column, and a limit groove corresponding to the limit column is provided on the frame at the top.

[0010] Preferably, a fish-attracting light is installed on the inside of the wing wall at the entrance to the fishway.

[0011] Preferably, a mounting block is fixed to the top of the frame, the first rack actively penetrates the mounting block, and the mounting block forms a limit on the first rack.

[0012] Preferably, both ends of the inner shaft actively penetrate the framework.

[0013] Preferably, two sets of airways communicating with the hole are provided inside the inner projection of the rotating column, a piston column is connected to the bottom of the airways in a piston-like manner, and an insertion block is connected to the bottom of the piston column. An opening is provided at the bottom of the rotating column for the insertion block to extend and retract, and an insertion opening corresponding to the insertion block is provided at the bottom of the frame.

[0014] Furthermore, the present invention also discloses a method for attracting fish using a fishway entrance lure, which includes the following steps. As the water flow in the river channel increases, the water flow impacts the pressure cylinder and compresses the first spring. The gas inside the pressure cylinder is compressed and transmitted into the pipe, and the gas presses against one end of the first rack. Since one end of the first rack is connected to the inside of one end of the pipe via a piston, the first rack is translated, and the first rack rotates the inner shaft using its teeth. At this time, air pressure is acting on the inside of the hole, and the inner shaft rotates together with the rotating column via the retaining plate and sliding column. The rotating column reverses the front plates, reducing the gaps between the multiple sets of front plates, thereby reducing the amount of water flowing at the fishway entrance. At this time, the multiple sets of front plates form a wall, which can block the water flow and reduce the flow velocity. At this time, the openings at the bottom of one set of rotating columns correspond to a set of insertion openings on the bottom frame. As the inner shaft continues to rotate, it compresses a set of sliding columns and pushes them into the hole. The sliding columns compress the gas inside the hole, which in turn compresses the gas in the airway. This gas then compresses the piston column, and the insertion block is inserted into the insertion opening through the opening. At this point, the rotating columns are fixed and stop rotating further, preventing excessive rotation of the front plate. As the water flow in the river channel decreases, the first spring overcomes the water pressure and returns the compression cylinder to its original position, thereby creating an intake effect. Negative pressure is also generated inside the pipe, pulling back the first rack and causing a motion opposite to the above. When the inner shaft rotates initially, it drives the aforementioned pair of sliding columns to protrude from the hole, thereby creating negative pressure in the hole and airway, drawing back the aforementioned pair of piston columns and insertion blocks. This allows the inner shaft to continue rotating the rotating column in the opposite direction, causing the rotating column to gradually invert the front plate and open completely. This ensures the normal flow of water at the fishway entrance. At this time, another pair of piston columns and insertion blocks are inserted into another pair of insertion openings using the same principle, restricting the rotation of the rotating column.

[0015] The beneficial effects of the present invention are as follows. By installing an adjustment structure consisting of components such as a frame, rotating column, front plate, rear plate, and pressing cylinder at the fishway inlet, the present invention can reverse multiple sets of front and rear plates when the water flow is large, so that the multiple sets of front and rear plates reverse to form a single surface, thereby blocking the water flow and mitigating the flow velocity. In the case of excessive flow, the rear plate continues to slide, causing the water passage holes between the rear plate and the front plate to intersect with each other, thereby further blocking the water flow. When the water flow decreases, each component returns to its original position, thereby opening the multiple sets of front and rear plates to each other and ensuring the smooth passage of water. Furthermore, the water flow at the fishway inlet can also be supplemented by utilizing the water pressure from the upstream. The present invention can control the reversal of the front and rear plates by utilizing the pressure of the water flow, and further control the water flow velocity at the fishway inlet, thereby providing a stable water flow velocity in a section at the fishway inlet. [Brief explanation of the drawing]

[0016] [Figure 1] Figure 1 is a schematic diagram of the overall structure of the present invention. [Figure 2] Figure 2 is a cross-sectional view of the pressing cylinder of the present invention. [Figure 3] Figure 3 is a schematic diagram of the combined structure of the frame and front panel of the present invention. [Figure 4] Figure 4 is another viewpoint of Figure 3 of the present invention. [Figure 5] Figure 5 is a schematic diagram of the combined structure of the rotating column and front plate of the present invention. [Figure 6] Figure 6 is a cross-sectional view of Figure 3 of the present invention. [Figure 7] Figure 7 is a schematic diagram of the structure of the rotating column of the present invention. [Figure 8] Figure 8 is a schematic diagram of the internal structure of the rotating column of the present invention. [Figure 9] Figure 9 is a schematic diagram of the structure of the rotating column base of the present invention. [Figure 10] Figure 10 is a schematic diagram of the combined structure of the rotating column and inner shaft of the present invention. [Figure 11] Figure 11 is a cross-sectional view of the rotating column and inner shaft of the present invention. [Figure 12]Figure 12 is a schematic structural diagram of the inner shaft of the present invention. [Figure 13] Figure 13 is a schematic structural diagram of the top of the framework of the present invention. [Figure 14] Figure 14 is a schematic structural diagram of the bottom of the framework of the present invention. [Figure 15] Figure 15 is a schematic diagram of the water flow direction and the fish migration direction of the present invention. [Figure 16] Figure 16 is a schematic structural diagram with tooth patterns provided at the outer top end of the inner shaft. [Figure 17] Figure 17 is a schematic structural diagram in which one end of the first rack is connected to one end of a pipe via a piston.

Embodiments for Carrying out the Invention

[0017] Hereinafter, the present invention will be described in more detail with reference to the drawings and specific examples. As shown in FIG. 1, the fishway entrance fish attracting device includes a fixing plate 3 and two wing walls 1, and the two wing walls 1 form a fishway. At the entrance of the fishway, a fish collecting lamp 28 is installed inside the wing wall 1, and the fish collecting lamp 28 is used to guide fish to the fishway entrance position.

[0018] As shown in Figure 1-17, a frame 2 is fixed to one wing wall 1 at the fishway entrance, and the frame 2 is designed to be angled to the inner wing wall. Multiple rotating columns 7 are rotatably connected inside the frame 2, and multiple front plates 8 are rotatably connected via the multiple rotating columns 7. An inner shaft 9 is rotatably connected inside the rotating column 7, and both ends of the inner shaft 9 actively pass through the frame 2. Retaining plates 14 are fixed to both sides of the inner shaft 9, and a cavity 7.1 is provided inside the rotating column 7 for the retaining plates 14 to move. Multiple sets of holes 15 are provided inside the inner projection of the rotating column 7, and multiple sets of sliding columns 16 corresponding to the holes 15 are fixed to both sides of the retaining plates 14, and a second spring 17 is sleeved between the holes 15 and the retaining plates 14 on the outside of the sliding columns 16. An airway 18 communicating with a hole 15 is installed inside the inner protruding position of the rotating column 7, and a piston column 19 is connected to the bottom of the airway 18 in a piston-like manner, and an insertion block 20 is connected to the bottom of the piston column 19. An opening 21 for the insertion block 20 to extend and retract is provided at the bottom of the rotating column 7, and an insertion port 23 corresponding to the insertion block 20 is provided on the frame 2 at the bottom. A first rack 11 is slidably connected to the frame 2 at the top, and a mounting block 10 is fixed to the top of the frame 2, and the first rack 11 actively penetrates the mounting block 10 and the mounting block 10 forms a limit on the first rack 11. A tooth pattern 9.1 that interlocks with the first rack 11 is provided at the outer top end of the inner shaft 9, and a pressing cylinder 4 is installed on one side of the fixing plate 3 closer to the frame 2, and a first spring 6 is installed inside the pressing cylinder 4, and the pressing cylinder 4 is connected to a pipe 5. One end of the first rack 11 is connected to the inside of one end of the pipe 5 via a piston 5.1.

[0019] As the water flow in the river increases, the water flow impacts the pressing cylinder 4 and compresses the first spring 6. In this embodiment, as shown in Figure 2, the pressing cylinder 4 includes an outer cylinder and an inner cylinder (closed at one end) that slides into place inside the outer cylinder, and the first spring 6 is installed between the inner cylinder and the end of the outer cylinder. When the water flow impacts the inner cylinder, the inner cylinder slides inside the outer cylinder, producing an effect of compressing or pressurizing the gas. The gas inside the pressing cylinder 4 is compressed and transmitted into the pipe 5, and the gas presses against one end of the first rack 11. Since one end of the first rack 11 is connected to the inside of one end of the pipe 5 in a piston-like manner, the first rack 11 is translated, and the first rack 11 rotates the inner shaft 9 using the tooth pattern 9.1. At this time, air pressure is acting on the inside of the hole 15, and the inner shaft 9 rotates the rotating column 7 together with the retaining plate 14 and the sliding column 16. The rotating column 7 inverts the front plate 8, reducing the gap between the multiple sets of front plates 8, thereby reducing the amount of water flowing through the fishway entrance. When the front plate 8 rotates to the state shown in Figures 1, 3, and 4, the multiple sets of front plates 8 form a wall on one side, thereby blocking the water flow and mitigating the flow velocity. At this time, the opening at the bottom of one set of rotating columns 7 corresponds to one set of insertion openings 23 on the bottom frame 2, and as the inner shaft 9 continues to rotate, it compresses one set of sliding columns 16 and pushes it into the hole 15. The sliding columns 16 compress the gas inside the hole 15, which in turn compresses the gas inside the airway 18. The gas inside the airway 18 compresses the piston column 19, and the insertion block 20 is inserted into the insertion opening 23 through the opening 21. At this point, the rotating column 7 is fixed and stops rotating further, preventing excessive rotation of the front plate 8. As the water flow in the river channel decreases, the first spring 6 overcomes the water pressure and returns the pressing cylinder 4 to its original position, thereby creating an intake effect. Negative pressure is also generated inside the pipe 5, pulling back the first rack 11, thereby creating a motion opposite to the above. When the inner shaft 9 rotates initially, it drives the aforementioned pair of sliding columns 16 to protrude from the hole 15, thereby creating negative pressure in the hole 15 and the airway 18, drawing back the aforementioned pair of piston columns 19 and insertion block 20. This allows the inner shaft 9 to continue rotating the rotating column 7 in the reverse direction, causing the rotating column 7 to open gradually, reversing the front plate 8 until it is fully open. This ensures the normal flow of water at the fishway entrance. At this time, another pair of piston columns 19 and insertion block 20 are inserted into another pair of insertion openings 23 using the same principle, restricting the rotation of the rotating column 7.

[0020] Based on the above structure, a rear plate 12 is slidably connected to the back of the front plate 8, and the front plate 8 and rear plate 12 rotate together. A second rack 13 is installed on the top of the rear plate 12, and teeth that interlock with the second rack 13 are further provided on the outer top end of the inner shaft 9. Both the front plate 8 and the rear plate 12 are provided with corresponding water passages. In the state shown in Figure 1, water can flow through the water passages on the front plate 8 and the rear plate 12. However, if the water flow is excessive, as the inner shaft 9 continues to rotate, the teeth will be used to move the rear plate 12 laterally via the second rack 13, causing the water passages on the rear plate 12 and the front plate 8 to intersect, thereby preventing water from passing through the water passages and further mitigating the water flow at the fishway entrance. To return to the original position, the movement in the reverse direction should be performed.

[0021] The present invention further designs the inner shaft 9 as having a hollow structure, and the bottom of the inner shaft 9 is connected to a water pipe 22 via a joint, with the other end of the water pipe 22 extending to an upstream position. A row of first water holes 24 is provided on the outside of the inner shaft 9, and a row of second water holes 25 corresponding to the first water holes 24 is provided on the outside of the rotating column 7. If the water flow is insufficient, the inner shaft 9 continues to rotate in the reverse direction, causing the first water holes 24 and the second water holes 25 to correspond, and the water pipe 22 uses its own water pressure to eject upstream water through the first water holes 24 and the second water holes 25, replenishing the water flow velocity at the fishway entrance. When returning to the original position, the movement should be performed in the reverse direction.

[0022] A limit column 27 is installed at the top of the rotating column 7, and a limit groove 26 corresponding to the limit column 27 is provided on the top frame 2, which further limits the rotation of the rotating column 7.

[0023] This invention, as a whole, utilizes the pressure of the water flow to control the reversal of the front and rear plates, and further controls the water flow velocity at the fishway entrance, providing a stable water flow velocity in a section at the fishway entrance.

[0024] The embodiments described above are merely preferred technical solutions of the present invention and should not be considered limitations to the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims and equivalent substitution solutions of the technical features in the technical solutions described in the claims. That is, equivalent substitution improvements within this scope are also included in the scope of protection of the present invention. [Explanation of Symbols]

[0025] 1 wing wall 2. Framework 3 Fixed plate 4. Pressing cylinder 5 pipes 5.1 Piston 5.2 Internal walls 6 First spring 7. Rotating Column 7.1 Cavity 8 Front panel 9 Inner shaft 9.1 Teethprint 10 Mounting Blocks 11 First Rack 12 Rear plate 13 Second rack 14. Pressing plate 15 holes 16 Sliding Column 17 Second spring 18 Airway 19 Piston column 20 Insertion Blocks 21 Aperture 22 Water pipe 23 Insertion opening 24 First water hole 25 Second water hole 26 limit grooves 27 Limit Pillars 28 Fish-attracting lights

Claims

1. A fish-attracting device for the entrance of a fishway, comprising two wing walls (1) fixedly installed in the river channel to form a fishway, with fixing plates (3) provided at the fishway entrances of the two wing walls (1), and a frame (2) fixed to one of the wing walls (1). Multiple rotating columns (7) are rotatably connected inside the frame (2), a front plate (8) is provided outside the rotating columns (7), an inner shaft (9) is rotatably connected inside the rotating columns (7), retaining plates (14) are fixed on both sides of the inner shaft (9), a cavity (7.1) is provided inside the rotating columns (7) for the retaining plates (14) to operate, multiple sets of holes (15) are provided inside the rotating columns (7), multiple sets of sliding columns (16) corresponding to the holes (15) are fixed on both sides of the retaining plates (14), and on the outside of the sliding columns (16) there are holes ( A second spring (17) is sleeved between (15) and the retaining plate (14), a first rack (11) is slidably connected to the top of the frame (2), a tooth pattern (9.1) that interlocks with the first rack (11) is provided on the outer top end of the inner shaft (9), a pressing cylinder (4) is installed on one side of the fixing plate (3) closer to the frame (2), a first spring (6) is installed inside the pressing cylinder (4), the inside of the pressing cylinder (4) is in communication with one end of the pipe (5), one end of the first rack (11) is slidably fitted with the inner wall (5.2) of the other end of the pipe (5) via a piston (5.1), A fishway entrance fish-attracting device characterized in that when the rotating column (7) inverts the front plates (8), the spacing between the multiple front plates (8) becomes smaller, forming a wall on one side, or the multiple front plates (8) are completely opened.

2. The fishway entrance fish attracting device according to claim 1, characterized in that the inner shaft (9) is designed to have a hollow structure, the bottom of the inner shaft (9) is connected to a water pipe (22) via a joint, the other end of the water pipe (22) extends to an upstream position, a row of first water holes (24) is provided on the outside of the inner shaft (9), and a row of second water holes (25) corresponding to the first water holes (24) is provided on the outside of the rotating column (7).

3. The fishway entrance fish attracting device according to claim 1, characterized in that a limit column (27) is installed at the top of the rotating column (7), and a limit groove (26) corresponding to the limit column (27) is provided on the top frame (2).

4. The fishway entrance fish attracting device according to claim 1, characterized in that a fish-attracting light (28) is installed inside the wing wall (1) at the entrance of the fishway.

5. The fishway entrance fish attracting device according to claim 1, characterized in that a mounting block (10) is fixed to the top of the frame (2), the first rack (11) actively penetrates the mounting block (10), and the mounting block (10) forms a limit on the first rack (11).

6. The fishway entrance fish attracting device according to claim 1, characterized in that both ends of the inner shaft (9) actively penetrate the frame (2).

7. The fishway entrance fish attracting device according to claim 1, characterized in that two sets of airways (18) communicating with a hole (15) are provided inside the inner protrusion of the rotating column (7), a piston column (19) is connected to the bottom of the airways (18) in a piston-like manner, an insertion block (20) is connected to the bottom of the piston column (19), an opening (21) is provided at the bottom of the rotating column (7) for the insertion block (20) to extend and retract, and an insertion opening (23) corresponding to the insertion block (20) is provided at the bottom of the frame (2).

8. A method for attracting fish using a fishway entrance lure according to claim 7, comprising the following steps: As the water flow in the river increases, the water flow impacts the pressure cylinder (4) and compresses the first spring (6). The gas inside the pressure cylinder (4) is compressed and transmitted into the pipe (5), where it presses against one end of the first rack (11). Since one end of the first rack (11) is connected to the inside of the other end of the pipe (5) via the piston (5.1), the first rack (11) is translated. The first rack (11) uses its teeth (9.1) to rotate the inner shaft (9). At this time, air pressure is acting inside the hole (15), and the inner shaft (9) rotates together with the rotating column (7) via the retaining plate (14) and sliding column (16). The rotating column (7) reverses the front plate (8), reducing the gap between multiple sets of front plates (8), thereby allowing fish to enter the fishway. The flow rate of the water is reduced, and at this time, the multiple front plates (8) form a wall on one side, thereby blocking the water flow and mitigating the flow velocity. At this time, the opening (21) at the bottom of one set of rotating columns (7) corresponds to one set of insertion openings (23) on the bottom frame (2), and as the inner shaft (9) continues to rotate, it compresses one set of sliding columns (16) and pushes them into the hole (15), the sliding columns (16) compress the gas inside the hole (15), thereby compressing the gas inside the airway (18), the gas inside the airway (18) compresses the piston column (19), and the insertion block (20) is inserted into the insertion opening (23) through the opening (21), at which point the rotating column (7) is fixed and no longer rotates, preventing excessive rotation of the front plates (8). When the water flow in the river channel decreases, the first spring (6) overcomes the water pressure and returns the pressure cylinder (4) to its original position, thereby creating an intake effect and generating negative pressure inside the pipe (5), pulling back the first rack (11). This causes a motion opposite to that when the water flow in the river channel increases, and when the inner shaft (9) rotates rudimentarily, it drives the aforementioned pair of sliding columns (16) to protrude from the hole (15), thereby generating negative pressure inside the hole (15) and the airway (18), and the aforementioned pair of piston columns (19) and A method for attracting fish in a fishway entrance, characterized in that the insertion block (20) is sucked back, thereby allowing the inner shaft (9) to continue rotating the rotating column (7) in the opposite direction, and the rotating column (7) opens until the front plate (8) is gradually reversed and fully opened, thereby ensuring the normal flow of water at the fishway entrance, and at this time, another set of piston columns (19) and insertion blocks (20) are inserted into another set of insertion openings (23) using the same principle, thereby restricting the rotation of the rotating column (7).

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