Rotary fishway inlet structure and method for inducing rotation and driving fish

Abstract

The application discloses a rotating fishway inlet structure, which is sequentially arranged with a bottom slope structure, a rotating door structure, a fish driving system and a fishway from a front end to a rear end. The rotating door structure comprises a rotating door platform, two arc-shaped rotating door side walls are arranged outside the rotating door platform, a rotating shaft is arranged in the center of the rotating door platform, a rotating door is fixed on the rotating shaft, the rotating door divides the rotating door platform into four independent fish transfer spaces, each fish transfer space comprises a sunken fish collecting box, a top portion of the fish collecting box is provided with an opening and closing plate, the opening and closing plate is rotationally connected with a side edge of the fish collecting box, a hydraulic push-pull rod is connected with a top portion of the opening and closing plate, and a pair of rigid fish nets is clamped on the rotating door of each fish transfer space. The application forms a new operation mode of attracting, rotating and driving fish groups into the fishway, solves the technical problem that the fish groups repeatedly swim out of the inlet and reduce the attraction efficiency caused by the design type of the traditional fishway inlet, and further improves the efficiency and orderliness of the operation of the fishway inlet.

Description

Technical Field

[0001] This invention relates to a rotating fishway inlet structure and a method for inducing and driving fish, belonging to the field of water conservancy and hydropower ecological protection technology. Background Technology

[0002] Fishways are the most widely used type of fish passage facility in water conservancy and hydropower projects. Their structure mainly consists of an inlet, a chamber, and an outlet. The success of a fishway hinges on whether fish can quickly detect and smoothly enter it, making it a key research focus and challenge for many scholars in the field. From the conventional design perspective of fishway inlets, according to the "Design Code for Fish Passage Facilities in Hydropower Projects (NB / T35054-2015)," "Fishway inlets are usually designed as overflow weirs, vertical slots, or orifices; if necessary, fish-blocking or guiding facilities can be installed at the inlet." In particular, the opening and closing of fishway inlets is primarily achieved through vertically opening and closing gates at the inlet, resulting in a simplistic design and limited fish-attracting efficiency.

[0003] In conventional hydropower projects, the design of fishway inlets often results in fish repeatedly circling back out of the inlet and returning to the river channel after entering. For example, from June 21 to June 30, 2017, at the ZM Hydropower Station in Tibet, 4,320 fish entered the fishway downstream and 3,320 fish migrated upstream, resulting in a success rate of only 56.54%. In a PIT (Peripherally Intercepted Intake) experiment inside the fishway, only 58 out of 100 fish entered upstream and 37 migrated downstream. A significant proportion of the fish, after entering the fishway, swam back out of the inlet and returned to the river channel due to unclear upstream guidance, thus limiting the effectiveness of the fishway. Summary of the Invention

[0004] The purpose of this invention is to provide a rotating fishway inlet structure and a method for attracting, rotating, and driving fish. The fishway inlet is designed with a rotating shaft as its axis, a rotating gate with a detachable fishnet as its partition structure, and a sunken fish transfer space as its escape prevention structure. This breaks away from the traditional design concept of switch-type gate fishway inlets, which are inefficient at attracting fish, and forms a new mode of attracting fish into the fishway in a cyclical, programmed, and highly efficient manner, integrating "attracting-rotating-driving".

[0005] The technical solution of this invention: A rotating fishway inlet structure, comprising a bottom ramp structure, a rotating door structure, a fish-driving system, and a fishway arranged sequentially from front to rear; the rotating door structure includes a rotating door platform located at the rear end of the bottom ramp structure, with two arc-shaped rotating door sidewalls on the left and right sides of the rotating door platform, and a rotating shaft vertically rotating at the center of the rotating door platform, on which a rotating door is fixed. The rotating door is composed of an X-shaped steel frame with four mutually perpendicular sides, dividing the rotating door platform into four independent fish transfer spaces. Each fish transfer space includes a sunken fish collection box, with an opening and closing plate on the top of the fish collection box. The arc-shaped edge of the opening and closing plate near the rotating shaft is rotatably connected to the edge of the fish collection box. A hydraulic push-pull rod is movably connected to the top surface of the opening and closing plate. The top end of the hydraulic push-pull rod is movably fixed to the bottom of the horizontal fixed rod. The horizontal fixed rod is fixedly sleeved on the upper end of the rotating shaft. A rigid fishing net is movably snapped onto the rotating door corresponding to each fish transfer space. The fish driving system includes two spaced fish driving channel side walls. The fish driving channel is located between the two fish driving channel side walls. The head end of each fish driving channel side wall is connected to the tail end of an arc-shaped rotating door side wall. A rotating belt is installed on the side wall of each arc-shaped rotating door side wall facing the fish driving channel and located above the rotating door. The rotating belt is driven by four rectangularly distributed rotating wheels. The rotating belt is fixedly equipped with a belt hook. A fishing net hanging ring is installed at the top end of each fishing net.

[0006] In the aforementioned rotating fishway inlet structure, each rotating door has multiple retractable grooves on the inner and outer outer edges and bottom edges of its steel frame. Each retractable groove includes a fixed hook, which is formed by connecting a fixed end and a rotating end via a groove shaft. The fixed end is connected to the surface of the steel frame, and the inner wall of the rotating end is connected to the surface of the steel frame via a built-in spring.

[0007] In the aforementioned rotating fishway inlet structure, two horizontal gates are provided at the front end of the rotating door, and the horizontal gates are located close to the head end of the side wall of the arc-shaped rotating door.

[0008] In the aforementioned rotating fishway inlet structure, each horizontal gate has multiple water spray pipes spaced at intervals along its height on the inner side of the gate frame, and each water spray pipe is inclined towards the bottom slope structure.

[0009] In the aforementioned rotating fishway inlet structure, the top end of the rotating shaft is rotatably fixed on a horizontal fixed beam, the other end of the horizontal fixed beam is fixed to the inner side wall of the rotating door, and the top end of the horizontal fixed beam is also provided with a first motor to drive the rotating shaft to rotate.

[0010] In the aforementioned rotating fish passage inlet structure, the rotating wheel is driven by a second motor fixed to the side wall of the fish-driving channel, and the height of the side wall of the fish-driving channel is more than twice that of the revolving door.

[0011] In the aforementioned rotating fishway inlet structure, the belt hook is a motor-driven rotatable hook; the bottom of the fishnet is equipped with fishnet rollers; and the fish collection box is equipped with a fish disturbance device.

[0012] In the aforementioned rotating fishway inlet structure, the fishway is a conventional vertical slot fishway structure. Its main structure includes the fishway body, fishway pool chamber, partition, guide plate and fishway bottom plate. The fish-driving channel is connected to the rotating door platform. Its width is the same as the width of the fishway pool chamber. The bottom elevation of the fish-driving channel is higher than the elevation of the fishway bottom plate, forming a certain height difference with the fishway bottom plate.

[0013] In the aforementioned rotating fishway inlet structure, the bottom slope structure includes a bottom slope with an uneven gravel bottom.

[0014] A method for attracting and driving fish using a rotating fishway inlet structure includes the following steps:

[0015] (1): The second motor starts the drive wheel to rotate the rotating belt and lower the fishing net vertically into the multiple retractable grooves of the revolving door. The built-in springs of the retractable grooves are in a contracted state, and the fixed hooks block the fishing net and fix it. The first motor drives the rotating shaft to rotate the revolving door and the fishing net to face the direction in which the fish swim.

[0016] (2): The fish in the river flow upstream along the bottom slope towards the inlet. At this time, the horizontal gate opens to both sides. According to the preference of the upstream fish species for the flow rate, the water spray pipes on the horizontal gate are turned on to create suitable water flow conditions to attract fish. The fish gradually swim to the revolving gate platform.

[0017] (3): The fish school goes up the bottom slope to the top of the bottom slope and the connection between the top of the fish collection box. The hydraulic push-pull rod is activated to pull the opening and closing plate up to a certain height. The fish school then slides into the sinking section of the transfer fish space through the gap between the arc edge of the opening and closing plate and the edge of the fish collection box.

[0018] (4): After the fish enter the lower section of the fish transfer space, the hydraulic push-pull rod pushes the opening and closing plate down until its arc edge connects with the edge of the fish collection box. The fish are temporarily stored in the lower section of the fish transfer space at the fish collection box at the lower end of the opening and closing plate.

[0019] (5): The first motor drives the rotating shaft and the rotating door to rotate counterclockwise. When the fish and the rotating door rotate together to face the direction of the fish driving channel, the fish interference device in the sinking section of the transfer fish space is activated. The hydraulic push-pull rod pulls the opening and closing plate up to a certain height. The fish then enter the fish driving channel through the gap between the arc edge of the opening and closing plate and the edge of the fish collection box. The second motor starts and the rotating wheel drives the belt to rotate. The belt hook hooks the fishing net hanging ring and drives the fishing net to slide in the horizontal direction, and drives the fish towards the fish passage along the fish driving channel.

[0020] (6): After the fish enter the fishway, they continue to be attracted by the hydraulic conditions inside the fishway chamber and go upstream along the vertical seams of each chamber to pass through the fishway.

[0021] (7): The second motor starts, the rotating wheel drives the belt to continue rotating, the belt hook lifts the fishing net vertically, and then slides it horizontally back to the top position aligned with the rotating gate, waiting for the next fish collection and transfer cycle to arrive, and then the fishing net is lowered vertically to the retractable groove of the rotating gate again, repeating the above process of attracting, transferring and driving fish.

[0022] The beneficial effects of the present invention: Compared with the prior art, the present invention has the following advantages:

[0023] 1. Overcoming the technical challenge of insufficient fish-attracting efficiency at fishway inlets. This application, adhering to the design principles of the hydraulic conditions required for fish attraction in fishways, comprehensively innovates a new type of fishway inlet. Through the design of horizontal gates, a revolving gate-like structure, and a fish-driving system, independent ecological spaces are set up for the attraction, transfer, and driving of fish. Fish can complete different ecological processes through these independent ecological spaces, thus overcoming the technical challenge of reduced attraction efficiency caused by fish repeatedly swimming out of the inlet in traditional fishway inlet designs.

[0024] 2. Pioneering a novel operational mode integrating "luring-transferring-driving" at fishway entrances. This application focuses on improving the efficiency of fish attraction at fishway entrances, innovating a core concept of a new operational mode that uses "luring-transferring-driving" to attract fish into the fishway. This completely changes the traditional fish attraction mode of fishway entrances with up-and-down opening and closing gates, further enriching the ecological function of this key design element and further enhancing the efficiency and orderliness of fishway entrance operation.

[0025] 3. Multifunctional design that combines fish transfer and temporary storage with an escape prevention system. This application incorporates a sinkable fish transfer space within the revolving door platform. Specifically, when the fish swim upstream to the top of the fish collection box at the top of the bottom slope, a hydraulic push-pull rod pulls the opening and closing plate upwards to a certain height. The fish then slides into the sinking section of the fish transfer space through the gap between the curved edge of the opening and closing plate and the edge of the fish collection box. The hydraulic push-pull rod then pushes the opening and closing plate down until its curved edge connects with the edge of the fish collection box, where the fish are temporarily stored in the sinking section of the fish transfer space at the bottom of the opening and closing plate. When the fish and the revolving door rotate together to face the fish-driving channel, the hydraulic push-pull rod pulls the opening and closing plate upwards to a certain height, and the fish then enter the fish-driving channel through the gap between the curved edge of the opening and closing plate and the edge of the fish collection box. This design provides a relatively independent and safe temporary storage space for the fish, and the hydraulic push-pull rods acting as a barrier on the opening and closing plate prevent highly active fish from jumping out of the revolving door platform again, thus reducing the efficiency of attracting and transferring the fish. Attached Figure Description

[0026] Figure 1 Top view of the overall structure of the invention;

[0027] Figure 2 An inlet view of the overall structure of this invention;

[0028] Figure 3 A perspective view of the overall structure of the fish-driving channel of this invention;

[0029] Figure 4 The present invention relates to the overall structure of an X-shaped revolving door;

[0030] Figure 5 Overall structural diagram of the sunken fish transport space of this invention;

[0031] Figure 6 Exploded view of the overall submerged fish transport space of this invention;

[0032] Figure 7 Diagram of the submerged fish transport space transfer process of this invention (the opening and closing plate is pulled up to a certain height);

[0033] Figure 8 Diagram of the submerged fish transport space transfer process of this invention (the opening and closing plate is pushed to close);

[0034] Figure 9 This invention relates to a single-leaf revolving door structure (without a fixed fishing net);

[0035] Figure 10 This invention relates to a single-leaf revolving door structure (with a fixed fishing net);

[0036] Figure 11 The present invention provides a detailed structure for a retractable groove.

[0037] Figure 12 Cross-sectional view of the fish-driving structure of this invention (horizontal and vertical reciprocating motion of the fishing net);

[0038] Figure 13 Detailed view of the rotating belt of this invention.

[0039] Reference numerals: 1-bottom slope structure, 11-bottom slope, 12-gravel, 2-revolving door structure, 21-horizontal gate, 22-spray pipe, 23-revolving door platform, 24-revolving door, 25-rotating shaft, 26-horizontal fixed beam, 27-revolving door sidewall, 28-first motor, 29-retractable trench, 210-fixed hook, 211-trench rotating shaft, 212-built-in spring, 213-hydraulic push-pull 214-Pole, 215-Fish collection box, 216-Horizontal fixed pole, 3-Fish driving system, 31-Fish driving channel side wall, 32-Fish driving channel, 33-Belt hook, 34-Fish net, 35-Fish net roller, 36-Rotating belt, 37-Rotating wheel, 38-Fish net hanging ring, 39-Second motor, 4-Fishway, 41-Fishway body, 42-Baffle, 43-Guide plate, 44-Fishway bottom plate, 5-School of fish. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0041] An embodiment of the present invention: a rotary fishway inlet structure, such as... Figure 1-13 As shown, the present invention is structurally composed of a bottom ramp structure 1, a revolving door structure 2, a fish-driving system 3, and a fish passage 4 arranged in sequence from front to back.

[0042] The bottom slope structure 1 consists of a bottom slope 11 and gravel 12. The revolving door system 2 is connected to the bottom slope 11, which is of the gentle slope type. The bottom slope 11 is inclined to connect to the external river channel. Its slope meets the upstream slope requirements of the main fish species. The bottom slope 11 is provided with an uneven gravel 12 substrate to meet the substrate conditions required for fish to swim upstream.

[0043] The revolving door structure 2 consists of a horizontal gate 21, a water spray pipe 22, a revolving door platform 23, a revolving door 24, a rotating shaft 25, a horizontal fixed beam 26, a revolving door side wall 27, a first motor 28, a retractable groove 29, a fixed hook 210, a groove rotating shaft 211, an internal spring 212, a hydraulic push-pull rod 213, an opening and closing plate 214, a fish collection box 215, and a horizontal fixed rod 216.

[0044] The revolving door structure 2 includes a revolving door platform 23 located at the rear end of the bottom slope structure 1. Two arc-shaped revolving door sidewalls 27 are located on the left and right sides of the outer side of the revolving door platform 23. A vertically rotating shaft 25 is mounted at the center of the revolving door platform 23, and a revolving door 24 is fixed to the shaft 25. The revolving door 24 is composed of an X-shaped steel frame with four mutually perpendicular sides. The revolving door 24 divides the revolving door platform 23 into four independent fish transfer spaces, each fish transfer space including a sunken fish collection area. The fish collection box 215 has a top opening and closing plate 214. The arc-shaped edge of the opening and closing plate 214 near the rotating shaft 25 is rotatably connected to the edge of the fish collection box 215. A hydraulic push-pull rod 213 is movably connected to the top surface of each opening and closing plate 214. The top end of the hydraulic push-pull rod 213 is movably fixed to the bottom of the horizontal fixed rod 216. The horizontal fixed rod 216 is fixedly sleeved on the upper end of the rotating shaft 25. A rigid fish net 34 is movably engaged on the rotating door 24 corresponding to each fish transfer space. The top end of the rotating shaft 25 is rotatably fixed to the horizontal fixed beam 26. The horizontal fixed beam 26 is horizontally set, and its other end is fixed to the inner side wall of the rotating door side wall 27. The top end of the horizontal fixed beam 26 is also equipped with a first motor 28 that drives the rotating shaft 25 to rotate.

[0045] The revolving door 24 is composed of an X-shaped steel frame with four mutually perpendicular sides. The revolving door 24 rotates horizontally around its central pivot 25, driven by a motor 28 connected to its top. The revolving door 24 is fixed to the revolving door platform 23 by a horizontal fixing beam 26.

[0046] The revolving door 24 is equipped with a dedicated revolving door passage, that is, it has arc-shaped revolving door side walls 27 on both sides. The radius of the arc-shaped revolving door side walls 27 is the same as the radius of the single revolving door 24, ensuring that the revolving door 24 forms four independent and relatively independent transfer fish spaces during the process of rotating in a circle.

[0047] The four relatively independent fish transfer spaces are designed to be sunken, including hydraulic push-pull rods 213, opening and closing plates 214, fish collection boxes 215, etc. The opening and closing plates 214 are connected to the end of the bottom slope 11, and the opening and closing plates 214 in each fish transfer space are connected to the corresponding hydraulic push-pull rods 213. When the fish swarm 5 ascends along the bottom slope 11 to the point where the top of the bottom slope 11 connects with the top of the fish collection box 215, the hydraulic push-pull rod 213 pulls the opening and closing plate 214 upward to a certain height. The fish swarm 5 then slides into the lower section of the fish transfer space through the gap between the arc edge of the opening and closing plate 214 and the edge of the fish collection box 215. The hydraulic push-pull rod 213 pushes the opening and closing plate 214 down until its arc edge connects with the edge of the fish collection box 215. The fish swarm 5 is temporarily stored in the lower section of the fish transfer space of the fish collection box 215 at the lower end of the opening and closing plate 214. When the fish swarm 5 and the revolving door 24 rotate together to face the fish-driving channel 32, the fish interference device in the lower section of the fish transfer space is activated. The hydraulic push-pull rod 213 pulls the opening and closing plate 214 upward to a certain height, and the fish swarm 5 then enters the fish-driving channel 32 through the gap between the arc edge of the opening and closing plate 214 and the edge of the fish collection box 215.

[0048] Fish-disrupting devices such as fish-repelling lights and fish-repelling sound waves are installed in the lower section of the fish transfer space. During the fish-driving stage, the fish 5 can be driven out of the lower section of the fish transfer space and into the fish-driving channel 32.

[0049] Each revolving door 24 has multiple retractable grooves 29 along its inner and outer outer edges and bottom edge. Each retractable groove 29 includes a fixing hook 210, which consists of a fixed end and a rotating end connected by a groove shaft 211. The fixed end is connected to the surface of the steel frame, and the inner wall of the rotating end is connected to the surface of the steel frame via a built-in spring 212. Several retractable grooves 29 are evenly distributed along the inner and outer edges of the frame of each revolving door 24, with some grooves along the outer edge and others along the bottom edge. The retractable groove 29 consists of a fixed hook 210, a groove shaft 211, and a built-in spring 212. When the fishing net 34 is loaded vertically downwards from the top of the revolving door 24 onto the door frame, the built-in spring 212 of the retractable groove 29 is in a contracted state, and the rotating end of the fixed hook 210 blocks and fixes the fishing net 34. When the fishing net 34 is pulled out of the revolving door 24, the fishing net 34 contacts the rotating end of the fixed hook 210. Under the pressure of the fishing net 34 moving outward, the built-in spring 212 of the retractable groove 29 is stretched. Under the continued pressure, the groove shaft 211 rotates and drives the rotating end of the fixed hook 210 to open, so that the fishing net 34 can be pulled out of the revolving door 24. Afterward, the rotating end of the fixed hook 210 springs back to its original state.

[0050] Each fishing net 34 consists of two rigid fishing nets perpendicular to each other. The fishing net 34 is designed to be permeable to water but not to fish. The size of each fishing net 34 is equal to the area of ​​the two revolving door frames 24. After each fishing net 34 is mounted on the two revolving door frames 24, when it is not pulled outward, it can rotate accordingly with the rotation of the door frame due to the obstruction of the retractable groove 29.

[0051] Two horizontal gates 21 are provided at the front end of the revolving door 24. When the fishway 41 or the revolving door 24 needs maintenance or cleaning, and fish are not needed to pass through temporarily, the horizontal gates 21 can be closed in the middle, cutting off the connection between the fishway 4 and the outside water. When fish are passing through the fishway 4 normally, the horizontal gates 21 can be opened to both sides to form different opening degrees, which can both adjust the water flow at the fishway inlet and control the size of the independent space of the fish-attracting link at the fishway inlet.

[0052] On the inner side of the gate frame of the two horizontal gates 21, water spray pipes 22 are installed at different heights. The direction of each water spray pipe 22 is inclined towards the bottom slope 11. During the process of attracting fish at the fish passage inlet, the water flow rate and flow velocity of different water spray pipes 22 can be sprayed to further optimize the water flow conditions for attracting fish at the fish passage inlet.

[0053] The fish-driving system 3 includes a fish-driving channel sidewall 31, a fish-driving channel 32, a belt hook 33, a fishing net 34, a fishing net roller 35, a rotating belt 36, a rotating wheel 37, a fishing net hanging ring 38, and a second motor 39. The fish-driving channel 32 is connected to the revolving door platform 23, and its width is the same as the width of the fish passage chamber. The bottom elevation of the channel is higher than the elevation of the fish passage floor 44, forming a certain height difference with the fish passage floor 44 to prevent the fish 5 driven into the fish passage from swimming back to the fish-driving channel 32.

[0054] Fish-driving channel 32 is provided with side walls 31 on both sides. The height of the side walls 31 and the revolving door side wall 27 is twice that of the revolving door 24. A rotating belt 36 is provided on the inner side of the side walls 31 and the revolving door side wall 27 on both sides. The rotating belt 36 is driven to rotate by four wheels 37, which are driven by a second motor 39.

[0055] The rotating belt 36 is equipped with a belt hook 33, which can be connected to the fishing net hanging ring 38 on the top corner of the fishing net 34. When the fishing net 34 slides horizontally or vertically, the second motor 39 is started, causing the rotating wheel 37 to drive the rotating belt 36 to rotate. The belt hook 33 hooks the fishing net hanging ring 38, causing the fishing net 34 to slide. When the fishing net 34 slides horizontally along the fish-driving channel 32, it can drive the fish 5 in the corresponding fish transfer space into the fish passage 4. After the fishing net 34 travels horizontally from the head end to the tail end of the fish-driving channel side wall 31, it will move vertically upward under the lifting action of the rotating belt 36, and then travel horizontally from the tail end to the head end of the fish-driving channel side wall 31, and then move vertically downward, so that the fishing net 34 is placed vertically into the revolving door 24. The belt hook 33 is a motor-driven rotatable hook. After the fishing net 34 is placed into the rotating door 24, the belt hook 33 rotates in the opposite direction under the drive of the motor, causing the belt hook 33 to separate from the fishing net ring 38, and then the rotating door 24 rotates.

[0056] The bottom of the fishing net 34 is provided with a fishing net roller 35, which can slide horizontally under the action of the rotating belt 36.

[0057] The fishway 4 is a conventional vertical slotted fishway structure, whose main structure includes the fishway body 41, fishway pool chamber, partition 42, guide plate 43, fishway bottom plate 44, etc.

[0058] When the fishway is activated for fish passage, this invention is achieved through the following steps:

[0059] (1) The second motor 39 starts, causing the rotating wheel 37 to drive the rotating belt 36 to rotate, vertically lowering the fishing net 34 into the multiple retractable grooves 29 of the rotating gate 24. The built-in springs 212 of the retractable grooves 29 are in a retracted state, and the fixing hooks 210 block the fishing net 34 and fix it. The first motor 28 works to drive the rotating shaft 25 to rotate the rotating gate 24 and the fishing net 34 to face the direction in which the fish 5 are swimming. Figure 12 ).

[0060] (2) The fish 5 in the river channel swim upstream against the current along the bottom slope 11 towards the inlet. At this time, the horizontal gate 21 opens to both sides. According to the preferred flow rate requirements of the upstream fish species, the water spray pipe 22 on the horizontal gate 21 is opened to create suitable water flow conditions to attract fish. The fish 5 gradually swim to the revolving gate platform 23. Figure 2 ).

[0061] (3) The fish 5 ascends along the bottom slope 11 to the junction of the top of the bottom slope 11 and the top of the fish collection box 215. The hydraulic push rod 213 pulls the opening and closing plate 214 up to a certain height. The fish 5 then slides into the lower section of the transfer fish space through the gap between the arc edge of the opening and closing plate 214 and the edge of the fish collection box 215. Figure 7 ).

[0062] (4) After the fish swarm 5 enters the lower section of the fish transfer space, the hydraulic push rod 213 pushes the opening and closing plate 214 down until its arc-shaped edge connects with the edge of the fish collection box 215. The fish swarm 5 is temporarily stored in the lower section of the fish transfer space in the fish collection box 215 at the lower end of the opening and closing plate 214. Figure 8 ).

[0063] (5) The first motor 28 drives the rotating shaft 25 and adjusts the rotating door 24 to rotate counterclockwise. When the fish swarm 5 and the rotating door 24 rotate together to face the fish-driving channel 32, the fish-driving lights and fish-driving sound waves in the sinking section of the fish transfer space are activated. The hydraulic push-pull rod 213 pulls the opening and closing plate 214 up to a certain height. The fish swarm 5 then enters the fish-driving channel 32 through the gap between the arc edge of the opening and closing plate 214 and the edge of the fish collection box 215. The second motor 39 starts, causing the rotating wheel 37 to drive the rotating belt 36 to rotate. The belt hook 33 hooks the fishing net hanging ring 38, causing the fishing net 34 to slide horizontally upward and drive the fish swarm 5 towards the fish passage 4 along the fish-driving channel 32. Figure 3 ).

[0064] (6) After the fish 5 enters the fishway 4, they continue to be attracted by the hydraulic conditions inside the fishway pool and go upstream along the vertical seams of each pool to pass through the fishway 4.

[0065] (7) The second motor 39 starts, causing the rotating wheel 37 to drive the rotating belt 36 to continue rotating. The belt hook 33 lifts the fishing net 34 vertically, and then slides it horizontally back to the top position aligned with the rotating gate 24, waiting for the next fish collection and transfer cycle to arrive. The fishing net 34 is then lowered vertically into the retractable groove 29 of the rotating gate 24, and the above process of attracting, transferring, and driving away fish is repeated. Figure 12 ).

[0066] It should be noted that the states (1) to (7) described above only represent the process of attracting, transferring, and driving fish for each unit of fishing net 34. In actual operation, when the fishing net 34 facing the bottom slope 11 is lowered to start attracting fish, the fishing net 34 facing the fish driving channel 32 can be either in a lowered state to drive fish or in a state ready to be lowered at the top of the revolving door 24. The specific operating state can be adjusted in a timely manner according to the actual operating needs.

[0067] When fish passage 4 is not used for maintenance or cleaning, the horizontal gate 21 is closed and brought to the center, cutting off the connection between the inside of fish passage 4 and the outside water.

Claims

1. A rotating fishway inlet structure, characterized in that: The structure arranged from front to back consists of a bottom ramp structure (1), a revolving door structure (2), a fish-driving system (3), and a fishway (4). The revolving door structure (2) includes a revolving door platform (23) located at the rear of the bottom ramp structure (1). Two arc-shaped revolving door sidewalls (27) are provided on the left and right sides of the outer side of the revolving door platform (23). A rotating shaft (25) is vertically rotatably mounted at the center of the revolving door platform (23). A revolving door (24) is fixed on the rotating shaft (25). The revolving door (24) is composed of an X-shaped steel frame with four mutually perpendicular sides. The revolving door (24) divides the revolving door platform (23) into four independent fish transfer spaces. Each fish transfer space includes a sunken fish collection box (215). The top of the fish collection box (215) is equipped with an opening and closing plate (214). The arc-shaped edge of the opening and closing plate (214) near the pivot (25) is rotatably connected to the edge of the fish collection box (215). The top surface of each opening and closing plate (214) is movably connected to a rod. A hydraulic push-pull rod (213) is movably fixed at the bottom of a horizontal fixed rod (216). The horizontal fixed rod (216) is fixedly sleeved on the upper end of a rotating shaft (25). A rigid fishing net (34) is movably snapped onto the rotating door (24) corresponding to each fish transfer space. The fish driving system (3) includes two spaced fish driving channel sidewalls (31), and the space between the two fish driving channel sidewalls (31) is a fish driving channel (32). Each channel... The head end of the fish passage side wall (31) is connected to the tail end of an arc-shaped revolving door side wall (27). Each arc-shaped revolving door side wall (27) is provided with a rotating belt (36) on the side wall facing the fish passage (32) and located above the revolving door (24). The rotating belt (36) is driven by four rectangularly distributed wheels (37). The rotating belt (36) is fixedly provided with belt hooks (33). Each fishing net (34) is provided with a fishing net hanging ring (38) at the top end.

2. The rotary fishway inlet structure according to claim 1, characterized in that: Each revolving door (24) has multiple retractable grooves (29) on the inner and outer outer edges and bottom edges of the steel frame. Each retractable groove (29) includes a fixed hook (210). The fixed hook (210) is formed by connecting a fixed end and a rotating end through a groove shaft (211). The fixed end is connected to the surface of the steel frame, and the inner wall of the rotating end is connected to the surface of the steel frame through a built-in spring (212).

3. The rotary fishway inlet structure according to claim 1, characterized in that: Two horizontal gates (21) are provided at the front end of the revolving door (24), and the horizontal gates (21) are located close to the head end of the side wall (27) of the arc-shaped revolving door.

4. The rotary fishway inlet structure according to claim 3, characterized in that: Each horizontal gate (21) has multiple water spray pipes (22) spaced along its height on the inner side of the gate frame, and each water spray pipe (22) is inclined towards the bottom slope structure.

5. The rotary fishway inlet structure according to claim 1, characterized in that: The top end of the rotating shaft (25) is rotatably fixed on the horizontal fixed beam (26). The horizontal fixed beam (26) is horizontally set and the other end is fixed on the inner side wall of the revolving door side wall (27). The top end of the horizontal fixed beam (26) is also provided with a first motor (28) to drive the rotating shaft (25) to rotate.

6. The rotary fishway inlet structure according to claim 1, characterized in that: The rotating wheel (37) is driven by a second motor (39) fixed on the side wall (31) of the fish-driving channel, the height of which is more than twice that of the revolving door (24).

7. The rotary fishway inlet structure according to claim 1, characterized in that: The belt hook (33) is a motor-driven rotatable hook; the bottom of the fishing net (34) is provided with a fishing net roller (35); the fish collection box (215) is provided with a fish disturbance device.

8. The rotary fishway inlet structure according to claim 1, characterized in that: The fish passage (4) is a conventional vertical slit fish passage structure. Its main structure includes the fish passage body (41), fish passage chamber, partition (42), guide plate (43) and fish passage bottom plate (44). The fish driving channel (32) is connected to the revolving door platform (23). Its width is the same as the width of the fish passage chamber. The bottom elevation of the fish driving channel (32) is higher than the elevation of the fish passage bottom plate (44), forming a certain height difference with the fish passage bottom plate (44).

9. The rotary fishway inlet structure according to claim 1, characterized in that: The bottom slope structure (1) includes a bottom slope (11), on which an uneven gravel (12) substrate is provided.

10. A method for inducing and driving fish using a rotating fishway inlet structure as described in any one of claims 1-9, characterized in that: It includes the following steps: (1): The second motor (39) starts the drive wheel (37) to drive the rotating belt (36) to rotate, and the fishing net (34) is vertically lowered into the multiple retractable grooves (29) of the revolving door (24). The built-in spring (212) of the retractable groove (29) is in a contracted state, and the fixing hook (210) blocks the fishing net (34) and fixes it. The first motor (28) drives the rotating shaft (25) to rotate the revolving door (24) and the fishing net (34) to face the direction in which the fish (5) swim. (2): The fish (5) in the river channel swim upstream along the bottom slope (11) towards the inlet. At this time, the horizontal gate (21) opens to both sides. According to the preferred flow rate requirements of the upstream fish species, the water spray pipe (22) on the horizontal gate (21) is opened to create suitable water flow conditions to attract fish. The fish (5) gradually swim to the revolving door platform (23). (3): The fish (5) ascends along the bottom slope (11) to the top of the bottom slope and the top of the fish collection box. The hydraulic push-pull rod (213) is activated to pull the opening and closing plate (214) up to a certain height. The fish (5) then slides into the sinking section of the transfer fish space from the gap between the arc edge of the opening and closing plate (214) and the edge of the fish collection box (215). (4): After the fish (5) enters the lower section of the fish transfer space, the hydraulic push-pull rod (213) pushes the opening and closing plate (214) down until its arc edge connects with the edge of the fish collection box (215). The fish (5) is temporarily stored in the lower section of the fish transfer space of the fish collection box (215) at the lower end of the opening and closing plate (214). (5): The first motor (28) drives the rotating shaft (25) and the rotating door (24) to rotate counterclockwise. When the fish (5) and the rotating door (24) rotate together to face the fish-driving channel (32), the fish interference device in the sinking section of the transfer fish space is activated. The hydraulic push-pull rod (213) pulls the opening and closing plate (214) up to a certain height. The fish (5) then enters the fish-driving channel (32) through the gap between the arc edge of the opening and closing plate (214) and the edge of the fish collection box (215). The second motor (39) starts, the rotating wheel (37) drives the rotating belt (36) to rotate, and the belt hook (33) hooks the fishing net hanging ring (38) to drive the fishing net (34) to slide in the horizontal direction and drive the fish (5) towards the fish passage (4) along the fish-driving channel (32). (6): After the fish (5) enters the fishway (4), they continue to be attracted by the hydraulic conditions inside the fishway pool and go upstream along the vertical seams of each pool to pass through the fishway (4). (7): The second motor (39) starts, the wheel (37) drives the rotating belt (36) to continue rotating, the belt hook (33) drives the fishing net (34) to be lifted in the vertical direction, and then slides back to the top position aligned with the rotating gate (24) in the horizontal direction, waiting for the next fish collection and transfer cycle to arrive, and then the fishing net (34) is lowered vertically to the retractable groove (29) of the rotating gate (24) again, repeating the above process of attracting, transferring and driving fish.

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