Fish-attracting device for fishway inlet

Abstract

The invention discloses a fish luring device for a fishway entrance, comprising two wing walls fixedly arranged in a river channel for forming a fishway, fixed plates are provided at the fishway entrances of the two wing walls, a frame is fixed at one of the wing walls, a plurality of rotating columns are rotatably connected to the inner side of the frame, a front plate is provided on the outer side of the rotating column, an inner shaft is rotatably connected to the inner side of the rotating column, a pressure plate is fixed on both sides of the inner shaft, a plurality of groups of openings are provided on the inner side of the rotating column, a plurality of groups of sliding columns matching the openings are fixed on both sides of the pressure plate, and a second spring is sleeved on the outer side of the sliding column between the openings and the pressure plate, a first rack is slidably connected to the top of the frame, a tooth pattern that meshes with the first rack is provided on the outer top of the inner shaft, an extrusion cylinder is provided on the side of the fixed plate close to the frame, a first spring is provided inside the extrusion cylinder, the interior of the extrusion cylinder is connected to one end of a pipe, and one end of the first rack is slidably matched with the inner wall of the other end of the pipe through a piston; the invention provides a water flow rate in a stable range for the fishway entrance.

Description

Technical Field

[0001] The invention relates to the field of water conservancy projects, in particular to a fish attracting device at a fishway inlet. Background Art

[0002] With the continuous construction of water conservancy projects, especially large-scale water conservancy facilities such as dams, the continuity of rivers has been severely disrupted, significantly impacting fish populations in river ecosystems. Fish migration is an essential part of the natural ecological cycle, but dam construction blocks their migration paths, affecting their reproduction and survival. To alleviate this problem, fishways have emerged as an engineering measure to assist fish in crossing dams.

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

[0004] The flow rate of water at the fishway inlet will also affect the migration of fish. If the water flow is too fast, the fish will consume a lot of physical energy during the migration process, and may even be exhausted and unable to continue migrating. Especially for smaller fish with weaker swimming ability, too fast water flow may become an obstacle to their migration, affecting the migration efficiency of fish and even causing them to miss the best time to spawn or forage; if the water flow is too slow, it may cause the fish to be in a low flow state for a long time, thereby increasing their physiological stress. Slow water flow may also make the fish unable to perceive the correct migration direction or speed, causing them to hesitate or choose the wrong path.

[0005] However, the water flow at the entrance of existing fishways is mostly consistent with the water flow in the river. The water flow in the river is unstable. When it rains, the water volume increases and the water flow speed becomes faster. When it is dry, the water flow speed becomes slower. A stable water flow speed helps fish form a regular migratory behavior pattern. Therefore, providing a stable water flow speed for the fishway is an urgent problem that needs to be solved. Summary of the Invention

[0006] The object of the present invention is to overcome the above-mentioned shortcomings and provide a fish attracting device at a fishway inlet to solve the technical problem of unstable water flow velocity at the existing fishway inlet.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a fish-way entrance fish-attracting device, comprising two wing walls fixed in a river channel for forming a fishway, fixed plates are provided at the fishway entrances of the two wing walls, a frame is fixed to one of the wing walls, a plurality of rotating columns are rotatably connected to the inner side of the frame, a front plate is provided on the outside of the rotating column, an inner shaft is rotatably connected to the inside of the rotating column, pressure plates are fixed on both sides of the inner shaft, a cavity for the pressure plate to move is provided inside the rotating column, a plurality of groups of openings are provided inside the rotating column, a plurality of sliding columns matching the openings are fixed on both sides of the pressure plate, and a second spring is also sleeved on the outside of the sliding column between the openings and the pressure plate, a first rack is slidably connected to the top of the frame, a tooth pattern is provided on the outer top of the inner shaft that meshes with the first rack, an extrusion cylinder is provided on the side of the fixed plate close to the frame, a first spring is provided inside the extrusion cylinder, the interior of the extrusion cylinder is connected to one end of the pipeline, and one end of the first rack is slidably matched with the inner wall of the other end of the pipeline through a piston.

[0008] Preferably, the inner shaft is designed as a hollow structure, and a water pipe is connected to the bottom of the inner shaft through an adapter, and the other end of the water pipe extends 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 cooperating with the first water holes is provided on the outside of the rotating column.

[0009] Preferably, the back surface of the front plate is slidably connected to a rear plate, and a second rack is provided on the top of the rear plate, and a tooth pattern that meshes with the second rack is also provided on the top outer side of the inner shaft.

[0010] More preferably, the front plate and the rear plate are both provided with water holes that cooperate with each other.

[0011] Preferably, a limiting column is provided on the top of the rotating column, and a limiting groove cooperating with the limiting column is provided on the top frame.

[0012] Preferably, a fish attracting light is installed at the entrance of the fishway, which is located on the inner side of the wing wall.

[0013] Preferably, a mounting block is fixed to the top of the frame, the first rack moves through the mounting block, and the first rack is limited by the mounting block.

[0014] Preferably, both ends of the inner shaft are movable through the frame.

[0015] Preferably, two groups of air ducts connected to the openings are further provided inside the protruding position on the inner side of the rotating column, the bottom of the air duct is piston-connected to a piston column, and the bottom of the piston column is connected to an insert block, the bottom of the rotating column is provided with an opening for the insert block to be extended and retracted, and the bottom of the frame is provided with a socket that cooperates with the insert block.

[0016] In addition, the present invention also discloses a fish attracting method of a fishway inlet fish attracting device, comprising the following steps:

[0017] When the water flow in the river increases, the water flow will impact the extrusion cylinder and compress the first spring. The gas in the extrusion cylinder is compressed into the inside of the pipe for transmission, causing the gas to squeeze one end of the first rack. Since one end of the first rack is connected to the inside of one end of the pipe in a piston-like manner, it will push the first rack to move horizontally. The first rack uses the tooth pattern to drive the inner shaft to rotate. At this time, there is air pressure in the opening, and the inner shaft will drive the rotating column to rotate together through the pressure plate and the sliding column. The rotating column drives the front plate to flip, so that the gap between the multiple groups of front plates becomes smaller, thereby reducing the flow rate of water at the fishway entrance. At this time, the multiple groups of front plates will form a wall, which can resist the water flow and slow down the water flow rate. At this time, the opening at the bottom of a group of rotating columns corresponds to a group of sockets on the bottom frame. When the inner shaft continues to rotate, it will drive a group of sliding columns to be compressed into the opening. The sliding column squeezes the gas inside the opening, and then squeezes the gas in the airway, so that the gas in the airway squeezes the piston column, causing the plug to pass through the opening and insert into the socket. At this time, the rotating column is stuck and will not continue to rotate, ensuring that the front plate does not rotate excessively;

[0018] When the water flow in the river decreases, the first spring overcomes the water pressure and drives the extrusion cylinder to reset, which will produce an air suction effect. Negative pressure will also be generated inside the pipe to pull the first rack back, thereby producing a movement opposite to the above movement. When the inner shaft rotates initially, it drives the above-mentioned set of sliding columns to extend out of the opening, thereby generating negative pressure in the opening and the airway, and sucking back the above-mentioned set of piston columns and plug blocks. In this way, the inner shaft can continue to drive the rotating column to reverse, so that the rotating column drives the front plate to gradually reverse and open until it is fully opened, so as to ensure the normal flow of water at the fishway entrance. At this time, another set of piston columns and plug blocks are inserted into another set of jacks using the same principle to limit the rotation of the rotating column.

[0019] Beneficial effects of the present invention: The present invention sets an adjustment structure composed of components such as a frame, a rotating column, a front plate, a rear plate and an extrusion cylinder at the fishway entrance. When the water flow is large, it can drive multiple groups of front and rear plates to flip, so that the multiple groups of front and rear plates flip into one surface, thereby resisting the water flow to slow down the water flow rate. If the water flow is too large, the rear plate continues to slide, so that the water holes between the rear plate and the front plate are staggered with each other, thereby further resisting the water flow. When the water flow becomes smaller, the various components are reset, so that the multiple groups of front and rear plates are opened to each other, ensuring the smooth passage of water, and the upstream water pressure can also be used to supplement the water flow at the fishway inlet; the present invention can use the pressure of the water flow to control the flipping of the front and rear plates, and then control the water flow rate at the fishway entrance, providing a stable range of water flow rate for the fishway entrance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2is a cross-sectional view of the extrusion cylinder of the present invention;

[0022] Figure 3 Schematic diagram of the matching structure of the frame and the front plate of the present invention;

[0023] Figure 4 For the present invention Figure 3 Another perspective of the picture;

[0024] Figure 5 Schematic diagram of the matching structure between the rotating column and the front plate of the present invention;

[0025] Figure 6 For the present invention Figure 3 sectional view of

[0026] Figure 7 It is a structural schematic diagram of the rotating column of the present invention;

[0027] Figure 8 It is a schematic diagram of the structure inside the rotating column of the present invention;

[0028] Figure 9 This is a schematic structural diagram of the bottom of the rotating column of the present invention;

[0029] Figure 10 Schematic diagram of the matching structure of the rotating column and the inner shaft of the present invention;

[0030] Figure 11 A cross-sectional view of the rotating column and the inner shaft of the present invention;

[0031] Figure 12 This is a schematic structural diagram of the inner shaft of the present invention;

[0032] Figure 13 This is a schematic structural diagram of the top of the frame of the present invention;

[0033] Figure 14 It is a structural schematic diagram of the bottom of the frame of the present invention;

[0034] Figure 15 Schematic diagram of water flow direction and fish migration direction of the present invention;

[0035] In the figure: 1. Wing wall; 2. Frame; 3. Fixed plate; 4. Extrusion cylinder; 5. Pipe; 6. First spring; 7. Rotating column; 8. Front plate; 9. Inner shaft; 10. Mounting block; 11. First rack; 12. Rear plate; 13. Second rack; 14. Pressing plate; 15. Opening; 16. Sliding column; 17. Second spring; 18. Airway; 19. Piston column; 20. Insert block; 21. Opening; 22. Water pipe; 23. Insert hole; 24. First water hole; 25. Second water hole; 26. Limiting groove; 27. Limiting column; 28. Fish-attracting lamp. DETAILED DESCRIPTION

[0036] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0037] like Figure 1 As shown: A fish-attracting device at the entrance of a fishway comprises a fixing plate 3 and two wing walls 1. A fishway is formed by the two wing walls 1. A fish-attracting lamp 28 is installed on the inner side of the wing wall 1 at the entrance of the fishway. The fish-attracting lamp 28 is used to attract fish to the entrance of the fishway.

[0038] like Figure 1-15 As shown, a frame 2 is fixed on a wing wall 1 at the entrance of the fishway. The frame 2 is located at the inner wing wall and is cut obliquely. A plurality of rotating columns 7 are rotatably connected to the inner side of the frame 2, and a plurality of front plates 8 are rotatably connected through the plurality of rotating columns 7. The inner side of the rotating column 7 is rotatably connected to an inner shaft 9. Both ends of the inner shaft 9 are movable through the frame 2. Pressure plates 14 are fixed on both sides of the inner shaft 9. A cavity for the pressure plate 14 to move is provided inside the rotating column 7. Several groups of openings 15 are provided inside the protruding part of the inner side of the rotating column 7. Several groups of sliding columns 16 cooperating with the openings 15 are fixed on both sides of the pressure plate 14. A second spring 17 is also sleeved on the outer side of the sliding column 16 between the opening 15 and the pressure plate 14. An airway 18 connected to the opening 15 is also provided inside the protruding position of the inner side of the rotating column 7. The bottom of 18 is piston-type connected to a piston column 19, and the bottom of the piston column 19 is connected to an insert block 20. The bottom of the rotating column 7 is provided with an opening 21 for the insert block 20 to extend and retract. The bottom frame 2 is provided with a socket 23 that cooperates with the insert block 20. The top frame 2 is slidingly connected with a first rack 11. The top of the frame 2 is fixed with a mounting block 10. The first rack 11 moves through the mounting block 10 and is limited by the mounting block 10. The top outer side of the inner shaft 9 is provided with a tooth pattern that meshes with the first rack 11. The fixed plate 3 is located on one side of the frame 2 and is provided with an extrusion cylinder 4. The inside of the extrusion cylinder 4 is provided with a first spring 6. The extrusion cylinder 4 is connected to a pipe 5, and one end of the first rack 11 is connected to the inside of one end of the pipe 5 in a piston-type manner.

[0039] When the water flow in the river increases, the water flow will impact the extrusion cylinder 4 and compress the first spring 6. In this embodiment, Figure 2As shown, the extrusion cylinder 4 includes an outer cylinder and an inner cylinder (one end is closed) that slides with the inner side of the outer cylinder, and a first spring 6 is arranged between the inner cylinder and the end of the outer cylinder. When the water flow hits the inner cylinder, it will drive the inner cylinder to slide in the outer cylinder, producing an effect similar to squeezing or compressing gas; the gas in the extrusion cylinder 4 is compressed to the inside of the pipe 5 for transmission, so that the gas squeezes 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, it will push the first rack 11 to move horizontally. The first rack 11 uses the tooth pattern to drive the inner shaft 9 to rotate. At this time, there is air pressure in the opening 15, and the inner shaft 9 will drive the rotating column 7 to rotate together through the pressure plate 14 and the sliding column 16. The rotating column 7 drives the front plate 8 to flip, so that the gap between the multiple groups of front plates 8 becomes smaller, thereby reducing the flow rate of water at the fishway inlet until the front plate 8 rotates to Figure 1 、 Figure 3 as well as Figure 4 In this state, the multiple groups of front plates 8 will form a wall, thereby resisting the water flow and slowing down the water flow rate. At this time, the openings at the bottom of a group of rotating columns 7 correspond to a group of sockets 23 on the bottom frame 2. When the inner shaft 9 continues to rotate, it will drive a group of sliding columns 16 to be compressed into the openings 15. The sliding columns 16 squeeze the gas inside the openings 15, and then squeeze the gas in the air channel 18, so that the gas in the air channel 18 squeezes the piston column 19, so that the insert 20 is inserted into the socket 23 through the opening 21. At this time, the rotating columns 7 are stuck and will not continue to rotate, ensuring that the front plate 8 does not rotate excessively;

[0040] When the water flow in the river decreases, the first spring 6 overcomes the water pressure and drives the extrusion cylinder 4 to reset, thereby producing an air suction effect. Negative pressure is also generated inside the pipe 5 to pull the first rack 11 back, thereby producing a movement opposite to the above movement. When the inner shaft 9 initially rotates, it drives the above-mentioned set of sliding columns 16 to extend out of the opening 15, thereby generating negative pressure in the opening 15 and the airway 18, and sucking back the above-mentioned set of piston columns 19 and plug blocks 20. In this way, the inner shaft 9 can continue to drive the rotating column 7 to reverse, so that the rotating column 7 drives the front plate 8 to gradually reverse and open until it is fully opened, so that the normal flow of water at the fishway entrance can be ensured. At this time, another set of piston columns 19 and plug blocks 20 are inserted into another set of jacks 23 using the same principle to limit the rotation of the rotating column 7.

[0041] On the basis of the above structure, a rear plate 12 is slidably connected to the back of the front plate 8. The front plate 8 rotates with the rear plate 12, and a second rack 13 is provided on the top of the rear plate 12. The outer top of the inner shaft 9 is also provided with a tooth pattern that meshes with the second rack 13. The front plate 8 and the rear plate 12 are both provided with water holes that cooperate with each other. Figure 1When in the open position, water can still flow through the water holes on the front plate 8 and the rear plate 12. However, when the water flow is too large, the inner shaft 9 will use the tooth pattern to drive the rear plate 12 to move sideways through the second rack 13 as it continues to rotate, so that the water holes on the rear plate 12 and the water holes on the front plate 8 are staggered with each other, thereby preventing the water from passing through the water holes, further slowing down the water flow at the fishway entrance, and then moving in the opposite direction when returning to the original position.

[0042] The present invention also designs the inner shaft 9 as a hollow structure. A water pipe 22 is connected to the bottom of the inner shaft 9 through an adapter, and the other end of the water pipe 22 extends to the 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 cooperating with the first water holes 24 is provided on the outside of the rotating column 7. When the water flow is small, the inner shaft 9 continues to reverse and the first water holes 24 and the second water holes 25 are matched. The water pipe 22 will use its own water pressure to spray the upstream water through the first water holes 24 and the second water holes 25 to supplement the water flow rate at the fishway entrance, and it can move in the opposite direction when returning to its position.

[0043] A limiting post 27 is provided on the top of the rotating post 7 , and a limiting groove 26 cooperating with the limiting post 27 is provided on the top frame 2 , which can further limit the rotation of the rotating post 7 .

[0044] The present invention generally utilizes the pressure of the water flow to control the flipping of the front and rear plates, thereby controlling the flow rate of water at the fishway inlet, and providing a stable range of water flow rate for the fishway inlet.

[0045] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A fishway inlet fish attracting device, comprising two wing walls (1) fixedly arranged in a river channel for forming a fishway, wherein the fishway entrances of the two wing walls (1) are provided with fixing plates (3), and a frame (2) is fixed to one of the wing walls (1), characterized in that: The inner side of the frame (2) is rotatably connected to a plurality of rotating columns (7), the outer side of the rotating column (7) is provided with a front plate (8), the inner side of the rotating column (7) is rotatably connected to an inner shaft (9), and pressure plates (14) are fixed on both sides of the inner shaft (9). The interior of the rotating column (7) is provided with a cavity for the pressure plate (14) to move, and the inner side of the rotating column (7) is provided with a plurality of groups of openings (15). Both sides of the pressure plate (14) are fixed with a plurality of groups of sliding columns (16) that match the openings (15), and the outer side of the sliding column (16) is located between the openings (15) and the pressure plate (14) and is also provided with a second spring (17). The frame (2) The top is slidably connected to a first rack (11), the outer top end of the inner shaft (9) is provided with a tooth pattern that meshes with the first rack (11), the fixed plate (3) is provided with an extrusion cylinder (4) on the side close to the frame (2), the extrusion cylinder (4) is provided with a first spring (6), the interior of the extrusion cylinder (4) is connected to one end of the pipe (5), and one end of the first rack (11) is slidably matched with the inner wall of the other end of the pipe (5) through a piston; when the rotating column (7) drives the front plate (8) to flip, the gap between the multiple groups of front plates (8) becomes smaller until a wall is formed, or the multiple groups of front plates (8) are completely opened.

2. A fishway inlet fish attracting device according to claim 1, characterized in that: The inner shaft (9) is designed as a hollow structure. A water pipe (22) is connected to the bottom of the inner shaft (9) through an adapter, and 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) cooperating with the first water holes (24) is provided on the outside of the rotating column (7).

3. The fishway inlet fish attracting device according to claim 1, characterized in that: The back of the front plate (8) is slidably connected to the rear plate (12), and a second rack (13) is provided on the top of the rear plate (12). The outer top end of the inner shaft (9) is also provided with tooth patterns that mesh with the second rack (13).

4. A fishway inlet fish attracting device according to claim 3, characterized in that: The front plate (8) and the rear plate (12) are both provided with water holes that cooperate with each other.

5. The fishway inlet fish attracting device according to claim 1, characterized in that: A limiting column (27) is provided on the top of the rotating column (7), and a limiting groove (26) that cooperates with the limiting column (27) is provided on the top frame (2).

6. The fishway inlet fish attracting device according to claim 1, characterized in that: The entrance of the fishway is located on the inner side of the wing wall (1) and is equipped with a fish attracting lamp (28).

7. The fishway inlet 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) moves through the mounting block (10), and the first rack (11) is limited by the mounting block (10).

8. The fishway inlet fish attracting device according to claim 1, characterized in that: Both ends of the inner shaft (9) are movable through the frame (2).

9. The fishway inlet fish attracting device according to claim 1, characterized in that: Two groups of air passages (18) communicating with the openings (15) are further provided inside the protruding position on the inner side of the rotating column (7). The bottom of the air passage (18) is piston-connected to a piston column (19), and the bottom of the piston column (19) is connected to an insert block (20). The bottom of the rotating column (7) is provided with an opening (21) for the insert block (20) to be extended and retracted. The bottom of the frame (2) is provided with a socket (23) cooperating with the insert block (20).

10. A method for attracting fish using the fishway inlet fish attracting device according to claim 9, characterized in that: The following steps are involved: When the water flow in the river increases, the water flow will impact the extrusion cylinder and compress the first spring. The gas in the extrusion cylinder is compressed into the inside of the pipe for transmission, causing the gas to squeeze one end of the first rack. Since one end of the first rack is connected to the inside of one end of the pipe in a piston-like manner, it will push the first rack to move horizontally. The first rack uses the tooth pattern to drive the inner shaft to rotate. At this time, there is air pressure in the opening, and the inner shaft will drive the rotating column to rotate together through the pressure plate and the sliding column. The rotating column drives the front plate to flip, so that the gap between the multiple groups of front plates becomes smaller, thereby reducing the flow rate of water at the fishway entrance. At this time, the multiple groups of front plates will form a wall, which can resist the water flow and slow down the water flow rate. At this time, the opening at the bottom of a group of rotating columns corresponds to a group of sockets on the bottom frame. When the inner shaft continues to rotate, it will drive a group of sliding columns to be compressed into the opening. The sliding column squeezes the gas inside the opening, and then squeezes the gas in the airway, so that the gas in the airway squeezes the piston column, causing the plug to pass through the opening and insert into the socket. At this time, the rotating column is stuck and will not continue to rotate, ensuring that the front plate does not rotate excessively; When the water flow in the river decreases, the first spring overcomes the water pressure and drives the extrusion cylinder to reset, thereby producing an air suction effect. Negative pressure is also generated inside the pipe to pull the first rack back, thereby producing a movement opposite to when the water flow in the river increases. When the inner shaft initially rotates, it drives the above-mentioned set of sliding columns to extend out of the opening, thereby generating negative pressure in the opening and the airway, and sucking back the above-mentioned set of piston columns and plug blocks. In this way, the inner shaft can continue to drive the rotating column to reverse, so that the rotating column drives the front plate to gradually reverse and open until it is fully opened, so as to ensure the normal flow of water at the fishway entrance. At this time, another set of piston columns and plug blocks are inserted into another set of jacks using the same principle to limit the rotation of the rotating column.

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