A fishway monitoring device with adaptive flow rate adjustment

Abstract

This utility model discloses a fishway monitoring device with adaptive flow velocity adjustment, including a channel shell with an inlet and an outlet at its two ends. Cameras are installed on the top and sides of the channel shell. A transparent side plate is fixed inside the channel shell on one side. A lifting box is installed on the back of the outlet end, and an impeller is installed inside the lifting box. A blocking net is fixed at the inlet of the lifting box, and an acceleration outlet is opened on the bottom of the outlet end. A sealing plate is installed at the location of the acceleration outlet. Lifting components are installed on both sides of the channel shell. When the water flow velocity is abnormal, the lifting box quickly sinks through the lifting components, so that the high-speed water flow can only pass through the inclined acceleration outlet at the bottom. At this time, the impeller encapsulated in the lifting box can rotate forward to accelerate or reverse to decelerate as needed. When rotating forward, the impeller pushes the water flow axially towards the acceleration outlet, increasing the flow velocity and solving the problem of fish clustering. When rotating in reverse, a reverse vortex is formed to consume kinetic energy, and the flow velocity is reduced to avoid the problem of image blurring.

Description

Technical Field

[0001] This utility model relates to the field of fishway monitoring technology, specifically a fishway monitoring device with adaptive flow rate adjustment. Background Technology

[0002] Fishways are artificial channels through which fish migrate. They are remedial measures taken when human activities disrupt fish migration routes. Generally, artificial channels are built on sluice gates or dams to protect the habits of fish. Fishway monitoring equipment uses technologies such as cameras to record and distinguish the number and types of fish passing through the fishway, and analyzes the number and types of fish.

[0003] In the prior art, a fish passage monitoring device is disclosed in patent publication number CN211773440U; belonging to the technical field of fish passage monitoring equipment; its key technical points include a fish passage body, a support block fixedly connected to the upper surface of the fish passage body, a rotary motor fixedly connected to the upper surface of the support block; a threaded rod fixedly connected to the output end of the rotary motor through a coupling, an L-shaped support frame fixedly connected to the upper surface of the support block, and the end of the threaded rod away from the rotary motor being rotatably connected to the lower surface of the horizontal part of the L-shaped support frame through a bearing; a threaded cylinder is threadedly connected to the outer wall of the threaded rod, an L-shaped push rod is fixedly connected to the side wall of the threaded cylinder, and a camera is fixedly connected to the bottom end of the vertical part of the L-shaped push rod; this utility model can effectively improve the clarity of the camera, thereby facilitating accurate counting of the number of fish passing through the fish passage body, and facilitating the use of the camera to count the number of fish passing through the glass channel.

[0004] However, existing technologies still have significant shortcomings. Traditional fishway monitoring devices typically use a fixed structure, making it difficult to dynamically adjust the water flow speed. This results in blurry images when fish pass through at high speeds due to excessively fast flow, and when the flow is too slow, fish tend to accumulate and overlap, affecting recognition accuracy. Utility Model Content

[0005] The purpose of this invention is to provide a fishway monitoring device with adaptive flow rate adjustment to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fishway monitoring device with adaptive flow rate adjustment, comprising a channel shell, an inlet end and an outlet end respectively provided at the two ends of the channel shell, cameras respectively installed on the top surface and side surface of the channel shell, a transparent side plate fixed on one side inside the channel shell, a lifting box provided on the back of the outlet end, and the lifting box being vertically aligned with the outlet position at the center of the outlet end, an impeller installed inside the lifting box, a blocking net fixed at the inlet of the lifting box, an acceleration outlet opened on the bottom surface of the outlet end, a sealing plate provided at the position of the acceleration outlet, and lifting components installed on both sides of the channel shell.

[0007] As can be seen, in the above technical solution, when the water flow speed is abnormal, the lifting box sinks quickly and accurately through the lifting component, so that the high-speed water flow can only pass through the inclined acceleration outlet at the bottom. At this time, the impeller encapsulated in the lifting box can rotate forward to accelerate or reverse to decelerate as needed. When rotating forward, the blades push the water flow axially towards the acceleration outlet, and the flow speed is increased to solve the problem of fish gathering together. When rotating in reverse, a reverse vortex is formed to consume kinetic energy, and the flow speed is reduced to avoid the problem of image blurring.

[0008] Preferably, the inlet end is rectangular, the outlet end is a truncated quadrangular shape, and the surface of the outlet end is trapezoidal.

[0009] It can be seen that in the above technical solution, the outlet end is a truncated quadrangular shape that, together with the impeller, can achieve the superposition of the Venturi effect and the blade thrust, and dynamically adjust the flow velocity to the optimal monitoring range.

[0010] Preferably, a rubber sleeve is fixed on the surface near the entrance of the lifting box, and the rubber sleeve abuts against the back of the exit end.

[0011] It can be seen that in the above technical solution, the rubber sleeve and other sealing rubber structures such as the inlet part of the lifting box can achieve the sealing when the lifting box is connected to the outlet at the center of the outlet end.

[0012] Preferably, the lifting assembly includes a slide rail, a lifting bracket is slidably connected inside the slide rail, and a housing is fixed to the surface of the lifting box.

[0013] As can be seen, in the above technical solution, the casing is used to connect the lifting bracket and the lifting box, and the slide rail serves as the installation limit for the lifting bracket.

[0014] Preferably, the connecting end of the housing and the lifting bracket is fixed, and the movable end of the lifting bracket is slidably connected to the inside of the slide rail.

[0015] As can be seen, in the above technical solution, when the lifting bracket slides inside the slide rail, it can move together with the lifting box connected by the casing, which is convenient for control.

[0016] Preferably, the slide rail is located near the outlet end and is bolted to both sides of the channel housing. A lead screw is installed inside the slide rail, and the moving end of the moving link is sleeved on the surface of the lead screw and threadedly connected to the surface of the lead screw.

[0017] As can be seen, in the above technical solution, adding a motor to the lead screw can make the lead screw rotate. Since the lifting bracket is threadedly connected to the surface of the lead screw, the lifting bracket can drive the lifting box to complete the movement and adjustment of its position when the lead screw rotates.

[0018] Preferably, a push-pull member is bolted to the bottom of the outlet end, and the telescopic end of the push-pull member is fixed to the sealing plate, and the sealing plate can move along the bottom surface of the outlet end. A flow meter is bolted to the back of the lifting box.

[0019] As can be seen, in the above technical solution, the push-pull component is mainly a servo electric cylinder, which can control the movement of the closed plate to control the opening size of the acceleration outlet. The flow meter and impeller are linked for lifting and lowering, which can monitor the water velocity in different channels such as the center outlet or the acceleration outlet in real time. The integrated lifting structure simplifies the mechanical structure.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] The coordinated design of the lifting box and the frustum-shaped outlet end significantly improves the accuracy and controllability of fishway monitoring. When the water flow velocity is abnormal, the lifting box quickly and accurately sinks through lifting components such as screws and slide rails, so that the high-speed water flow can only pass through the inclined acceleration outlet at the bottom. At this time, the impeller encapsulated in the lifting box can rotate forward to accelerate or reverse to decelerate as needed. Through the superposition of the Venturi effect and the thrust of the blades, the flow velocity is dynamically adjusted to the optimal monitoring range. When rotating forward, the blades push the water flow axially towards the acceleration outlet, and the increased flow velocity solves the problem of fish clustering. When rotating in reverse, a reverse vortex is formed to consume kinetic energy, and the reduced flow velocity avoids the problem of image blurring.

[0022] A barrier net can be used to block the impeller, preventing fish from directly contacting it and causing injury to the fish or damage to the impeller. The barrier net, impeller, and flow meter are all integrated into the lifting box, which can be raised and lowered together with the lifting box. This allows for precise adjustment of the impeller position to control the water flow according to changes in flow velocity, while ensuring that the barrier net effectively isolates the fish from the rotating impeller, avoiding mechanical damage or stress to the fish. At the same time, the linkage between the flow meter and the impeller in raising and lowering allows for real-time monitoring of the water velocity in different channels, such as the central outlet or the acceleration outlet. The integrated lifting structure simplifies the mechanical structure and reduces the need for independent drive units.

[0023] By dynamically adjusting the opening and closing degree of the acceleration outlet through the sealing plate, and forming a coordinated control with the impeller speed regulation, the optimal monitoring flow rate can be maintained more accurately and flexibly. When the water flow is too fast, the sealing plate moves forward to reduce the cross-sectional area of ​​the acceleration outlet, which, together with the impeller reversing, forms a double deceleration effect to avoid image blurring caused by fish passing by at high speed. When the water flow is too slow, the sealing plate retracts to expand the outlet, which, combined with the impeller rotating forward to increase thrust, prevents recognition overlap caused by fish accumulation. The flow meter provides real-time data feedback, making the opening and closing of the sealing plate linked with the impeller. At the same time, the flow guiding structure of the truncated pyramid ensures a smooth transition of the water flow after diversion. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a perspective view of the present utility model;

[0026] Figure 3 This is a front view of the present invention;

[0027] Figure 4 This is a side view of the present invention;

[0028] Figure 5 This is a schematic diagram of the interior of the channel shell of this utility model;

[0029] Figure 6 This is a schematic diagram of the lifting box of this utility model.

[0030] In the diagram: 1. Channel housing; 11. Inlet end; 12. Outlet end; 2. Camera; 3. Transparent side panel; 4. Lifting box; 41. Rubber sleeve; 42. Impeller; 43. Barrier net; 5. Acceleration outlet; 6. Lifting assembly; 61. Housing; 62. Lifting bracket; 63. Slide rail; 64. Lead screw; 7. Push-pull component; 8. Enclosure plate; 9. Flow meter. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figure 1-6 This utility model provides a technical solution:

[0033] Example 1: A fishway monitoring device with adaptive flow rate adjustment: It includes a channel housing 1, with an inlet end 11 and an outlet end 12 at its two ends. Cameras 2 are installed on the top and sides of the channel housing 1. A transparent side plate 3 is fixed inside the channel housing 1. The outer shell of the fishway monitoring device is the channel housing 1, which is installed in an artificial water tank as a tunnel for water flow and fishpond passage. Cameras 2 are installed on the top and sides of the channel housing 1. When fish pass through, information such as quantity and species of fish can be detected by image acquisition. The side cameras 2 are sealed by the transparent side plate 3, which can be sealed and fixed using sealant or gaskets to prevent water from entering the cameras. The issue of water ingress and damage to camera 2 is addressed by using camera 2 to simultaneously capture data from different directions, greatly avoiding the problem of missed detections due to overlapping fish. The top camera 2 records the number and distribution of fish passing through the area, while the side camera 2 captures fish characteristics such as body length and species up close through a waterproof transparent plate such as acrylic or tempered glass. This dual-view complementary approach effectively solves the problem of missed detections caused by overlapping fish when using a single camera 2, significantly improving detection accuracy. Based on the collected information, the migration patterns of fish can be understood, thereby determining the water quality at the migration sites. Long-term data on fish migration, such as species ratios and frequency of passage, can indirectly infer changes in water quality, such as a decrease in specific sensitive fish species, which may indicate a drop in dissolved oxygen, providing a basis for ecological restoration.

[0034] The inlet end 11 is rectangular, and the outlet end 12 is a truncated pyramid shape, with all surfaces of the outlet end 12 being trapezoidal. The inlet end 11 of the channel shell 1 is rectangular, with four mutually perpendicular sides forming the rectangular outline. The outlet end 12 is a truncated pyramid shape, with all surfaces of the outlet end 12 being trapezoidal, and the opening of the outlet end 12 gradually decreases in size. The through hole at the center is the outlet for water flow and fish. Under normal circumstances, fish enter the channel shell 1 from the inlet end 11 along with the water flow. Information about the fish entering is captured by image acquisition. Finally, the fish, along with the water flow, exit from the outlet at the center of the outlet end 12. A lifting box 4 is provided on the back of the outlet end 12, and the lifting box 4 is vertically aligned with the outlet position at the center of the outlet end 12. An impeller 42 is installed inside the lifting box 4. An acceleration outlet 5 is provided on the bottom surface of the outlet 12. However, if the water flow speed is too fast or too slow, it will affect the accuracy of the camera 2's data acquisition. When the water flow speed is too fast, the fish, along with the water, pass through the channel shell 1 too quickly, which can easily lead to blurry or inaccurate image acquisition. Similarly, when the water flow speed is too slow, the fish are likely to crowd inside the channel shell 1, making it difficult for the system to judge the fish information data from the acquired images. Therefore, a lifting box 4 is added at the outlet 12, and the speed of the water flow at the outlet is monitored in real time. An impeller 42 is added inside the lifting box 4, and the lifting box 4 is raised to the center outlet position of the outlet 12, so that the center outlet is blocked by the lifting box 4, thereby ensuring that the impeller 42 is submerged in water. At this time, the acceleration outlet 5 is opened, accelerating the flow of water. Acceleration outlet 5 is located on the bottom surface of outlet end 12. Since the bottom surface of outlet end 12 slopes upwards, fish and water flow can easily exit from acceleration outlet 5. A motor is added to impeller 42, controlling its forward and reverse rotation to control the speed of the water flow. Further, when the water flow speed is abnormal, exceeding or falling below a set threshold (equivalent to being too fast or too slow), the lifting box 4 descends to block the central through-hole of outlet end 12, forcing the water flow through the bottom-sloping acceleration outlet 5. At this time, the forward rotation of impeller 42, with the blade thrust aligned with the water flow, accelerates the water flow and resolves the image overlap problem caused by fish clustering. Reversing the blades cuts the water flow in the opposite direction, slowing the flow and preventing image blurring caused by high-speed fish passage. By directly interfering with the kinetic energy of the water flow by changing the direction of rotation, the impeller pushes the water towards the outlet during forward rotation, and the Venturi effect increases the flow velocity. During reverse rotation, the impeller forms a reverse vortex, consuming the energy of the water flow and reducing the flow velocity, thus dynamically maintaining the optimal monitoring flow velocity to ensure that the camera 2 clearly captures the characteristics of each fish. The impeller 42 uses propeller-type stainless steel blades with polished surfaces to reduce water flow resistance. The blade tilt angle is 20-25 degrees to optimize thrust efficiency. The central shaft sleeve is connected to the motor through a waterproof bearing and is entirely encapsulated inside the lifting box 4. A blocking net 43 is fixed at the entrance of the lifting box 4. The blocking net 43 added at the entrance of the lifting box 4 is used to prevent fish from contacting the impeller 42, effectively preventing fish from contacting the impeller 42 when it is rotating.This can lead to damage to mechanical structures or injury to fish.

[0035] Example 2:

[0036] A rubber sleeve 41 is fixed on the surface near the inlet of the lifting box 4, and the rubber sleeve 41 abuts against the back of the outlet end 12. When the center outlet of the truncated pyramidal outlet end 12 is aligned with the inlet of the lifting box 4, the rubber sleeve 41 on the surface of the inlet of the lifting box 4 abuts against the outlet end 12 to achieve a seal between the two. At the same time, an annular stepped sealing gasket can be added between the side wall of the lifting box 4 and the inner side of the truncated pyramidal outlet end 12. It is made of corrosion-resistant silicone material and has an L-shaped cross section to cover both radial and axial gaps. When the lifting box 4 descends to the position, the rubber sleeve 41 presses against the center outlet, and the stepped sealing gasket will be squeezed and deformed to fit tightly against the trapezoidal slope of the inner side of the outlet end 12, forming a second waterproof barrier to ensure that high-speed water flow will not seep in from the side gaps.

[0037] A sealing plate 8 is installed at the location of the acceleration outlet 5. A push-pull component 7 is bolted to the bottom of the outlet end 12, and the telescopic end of the push-pull component 7 is fixed to the sealing plate 8. The sealing plate 8 can move along the bottom surface of the outlet end 12. The sealing plate 8 is located on the bottom surface of the frustum-shaped outlet end 12. The push-pull component 7 is a waterproof servo electric cylinder. The servo electric cylinder mainly consists of a servo motor, a precision ball screw, a thrust bearing, a position feedback encoder, a cylinder body, and a waterproof shell. The servo motor receives control signals to drive the ball screw to rotate, converting the rotational motion of the motor into the linear motion of the push rod. The encoder provides real-time feedback of position information to form a closed-loop control, achieving high-precision displacement adjustment. The push-pull component 7 controls the pushing or retraction, allowing the sealing plate 8 to move on the bottom surface of the outlet end 12 to close or open the acceleration outlet 5. The opening and closing size of the acceleration outlet 5 can be controlled according to the water flow conditions. By dynamically adjusting the opening and closing degree of the acceleration outlet 5 through the sealing plate 8, the flow rate of the fish passage can be precisely controlled. When the water flow is too fast... The closing plate 8 moves forward to reduce the cross-sectional area of ​​the acceleration outlet 5, and combined with the reverse rotation of the impeller 42, it forms a double deceleration effect to prevent the fish from passing through at high speed and causing blurry image acquisition. When the water flow is too slow, the closing plate 8 is retracted to expand the outlet, and the impeller 42 rotates forward to increase the flow rate and prevent the fish from clogging. It is highly flexible. The overlapping seal of the closing plate 8 and the acceleration outlet 5 can adopt a stepped interlocking structure. The edge of the closing plate 8 is processed into a 45-degree chamfered surface, which is pressed tightly against the rubber sealing groove on the bottom surface of the outlet end 12. The push-pull part 7 applies a constant thrust to ensure water tightness. The back of the lifting box 4 is bolted with a flow meter 9, which is an ultrasonic Doppler flow meter 9. It is installed on the back of the lifting box 4 and can be raised and lowered together with the lifting box 4. When the acceleration outlet 5 is closed, the flow velocity at the center of the outlet end 12 can be monitored. When the acceleration outlet 5 is open, the flow meter 9 is located at the center of the outlet end 12 and can monitor the flow velocity of the water discharged from the acceleration outlet 5 below.

[0038] Example 3:

[0039] Lifting components 6 are installed on both sides of the channel housing 1. Each lifting component 6 includes a slide rail 63, with a lifting bracket 62 slidably connected inside the slide rail 63. A housing 61 is fixed to the surface of the lifting box 4, and the connection end of the housing 61 to the lifting bracket 62 is fixed. The movable end of the lifting bracket 62 is slidably connected to the inside of the slide rail 63. The slide rail 63 is located near the outlet end 12 and is bolted to both sides of the channel housing 1. A lead screw 64 is installed inside the slide rail 63, and the moving end of the moving connecting rod is sleeved on the surface of the lead screw 64 and threadedly connected to the surface of the lead screw 64. The lifting of the lifting box 4 is mainly controlled by the lifting components 6, which include components such as the slide rail 63 and the lead screw 64. The slide rail 63 is fixed to both sides of the channel housing 1 by reinforcing ribs, while the lead screw 64 and the limiting rod are located inside the slide rail 63. One end of the lifting bracket 62 is fixed to the surface of the lifting box 4 through the housing 61. The other end is simultaneously sleeved on the surface of the lead screw 64 and the limiting rod, and threadedly connected to the surface of the lead screw 64. It is worth noting that the part sleeved on the surface of the lead screw 64 and the limiting rod cooperates with the slide rail 63, allowing it to slide linearly along the slide rail 63. When a motor is added to the lead screw 64 so that the lead screw 64 can rotate under the drive of the motor, the lifting bracket 62 drives the lifting box 4 to move, thereby controlling the position of the lifting box 4. When the water flow velocity exceeds or falls below the set threshold, the lifting box 4 is precisely moved to the specified position for use. The speed of the impeller 42 can be adaptively adjusted through a closed-loop PID control system or other means. The ultrasonic transducer monitors the water flow velocity at the outlet 12 in real time. When the detected value exceeds the upper limit of the set threshold, the controller reduces the speed of the impeller 42 or even reverses it to weaken the kinetic energy of the water flow. If the flow velocity is below the lower limit of the threshold, the forward rotation speed of the impeller 42 is increased to enhance the thrust. The control algorithm dynamically calculates the speed correction amount and drives the waterproof motor through the PWM signal to avoid stress on the fish.

[0040] Working principle: After fish enter the channel shell from the rectangular inlet with the water flow, the dual cameras 2 on the top and side simultaneously collect information about the fish. When the flow rate is abnormal, the lifting box 4 sinks and blocks the central outlet through the screw 64 and slide rail 63 system, and the water flow is diverted to the bottom inclined acceleration outlet 5. At this time, the impeller 42 integrated in the lifting box 4 rotates forward to accelerate or reverse to decelerate according to the feedback data from the flow meter 9. At the same time, the servo electric cylinder-driven sealing plate 8 dynamically adjusts the opening and closing degree of the acceleration outlet 5 to form a flow rate coordinated control, ensuring that the fish pass through the monitoring area at the optimal speed. Finally, the water flow and fish are discharged from the acceleration outlet 5 or the central outlet, realizing accurate and adaptive ecological monitoring.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fishway monitoring device with flow rate self-adaptive adjustment, characterized in that: The system includes a channel housing (1), with an inlet end (11) and an outlet end (12) at its two ends. Cameras (2) are installed on the top and sides of the channel housing (1). A transparent side plate (3) is fixed inside one side of the channel housing (1). A lifting box (4) is provided on the back of the outlet end (12), and the lifting box (4) is vertically aligned with the outlet position at the center of the outlet end (12). An impeller (42) is installed inside the lifting box (4). A blocking net (43) is fixed at the inlet of the lifting box (4). An acceleration outlet (5) is opened on the bottom surface of the outlet end (12). A sealing plate (8) is provided at the position of the acceleration outlet (5). Lifting components (6) are installed on both sides of the channel housing (1).

2. The fishway monitoring device of claim 1, wherein: The inlet end (11) is rectangular, the outlet end (12) is a truncated quadrangular shape, and the surface of the outlet end (12) is trapezoidal.

3. The fishway monitoring device of claim 1, wherein: A rubber sleeve (41) is fixed on the surface near the entrance of the lifting box (4), and the rubber sleeve (41) abuts against the back of the outlet end (12).

4. The fishway monitoring device of claim 1, wherein: The lifting assembly (6) includes a slide rail (63), a lifting bracket (62) is slidably connected inside the slide rail (63), and a housing (61) is fixed on the surface of the lifting box (4).

5. The fishway monitoring device of claim 4, wherein: The connection end of the housing (61) and the lifting bracket (62) is fixed, and the movable end of the lifting bracket (62) is slidably connected to the inside of the slide rail (63).

6. The fishway monitoring device of claim 4, wherein: The slide rail (63) is located near the outlet end (12), and the slide rail (63) is bolted to both sides of the channel housing (1). A lead screw (64) is installed inside the slide rail (63), and the moving end of the moving link is sleeved on the surface of the lead screw (64) and threadedly connected to the surface of the lead screw (64).

7. The fishway monitoring device of claim 1, wherein: The bottom of the outlet end (12) is bolted with a push-pull member (7), and the telescopic end of the push-pull member (7) is fixed with the sealing plate (8). The sealing plate (8) can move along the bottom surface of the outlet end (12). The back of the lifting box (4) is bolted with a flow meter (9).

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