Underwater biological optical weighing device suitable for nuclear power backwashing pump station

Abstract

The invention discloses an underwater biological optical weighing device suitable for a nuclear power backwashing pump station, and relates to the technical field of underwater biological weighing, the underwater biological optical weighing device comprises a mounting rack, an image acquisition unit, a flow velocity detection unit and a server, the image acquisition unit performs continuous image acquisition on underwater organisms flowing through a diversion channel; the biological recognition module is used for processing the collected images according to an artificial intelligence image recognition algorithm so as to recognize the type, number and size information of underwater organisms; and the weight calculation module is used for calculating the total weight of the underwater creatures flowing through the canal within the measurement time according to the type, number and size information of the underwater creatures identified by the biological identification module in combination with the water flow speed obtained by the flow speed detection unit, so as to realize real-time optical weighing of the underwater creatures. The problems that in the prior art, when a weighing device relates to a nuclear power backwashing pump station, the sampling frequency is low, and the species of organisms cannot be sensed in real time are solved.

Description

Technical Field

[0001] This invention relates to the field of underwater biological optical weighing technology, and in particular to an underwater biological optical weighing device suitable for nuclear power plant backwashing pump stations. Background Technology

[0002] The backwash water channel at a nuclear power plant pump station is a channel for the flow of water after the cooling water drum filter equipment in the nuclear reactor has been cleaned. The water flowing through this channel is a mixture of marine organisms, debris, and water washed off the drum filter. Real-time monitoring of the weight and species of the marine organisms washed off is a safety requirement for nuclear power plants and is of great significance for understanding the quality of the cooling water and ensuring the safety of the nuclear reactor.

[0003] Currently, there are two main methods for biological sampling and weighing: manual sampling and weighing, and automated weighing using mechanical structures. Manual sampling involves personnel regularly setting up screens on branch canals to intercept organisms for a few minutes each day, weighing them, and recording the results. Manual sampling has several drawbacks: firstly, the large number of backwashing branch canals from pump stations requires a significant amount of manpower; secondly, controlling the sampling time for each sampling session is difficult, leading to inaccurate data; and thirdly, only 3 to 5 samplings can be performed per day, resulting in a low sampling frequency and the possibility of missing biological communities. Mechanical weighing technology uses a grab bucket to intercept organisms in the canals at set times, automatically weighing and managing the weight, and triggering an overload alarm. However, it suffers from several problems: it cannot identify biological species, the sampling frequency is still limited, and it is difficult to achieve truly real-time sensing.

[0004] It is evident that existing weighing devices used in nuclear power plant backwashing pump stations suffer from problems such as low sampling frequency and inability to detect biological species in real time when weighing underwater organisms. Summary of the Invention

[0005] The purpose of this invention is to provide an underwater biological optical weighing device suitable for nuclear power plant backwashing pump stations, which solves the problems of low sampling frequency and inability to detect biological species in real time when using existing weighing devices for underwater biological weighing in nuclear power plant backwashing pump stations.

[0006] To achieve this objective, the present invention adopts the following technical solution: An underwater biological optical weighing device suitable for nuclear power plant backwashing pump stations includes a mounting frame with a flow channel and a server. The mounting frame is installed on the backwashing water channel of the pump station. The mounting frame is equipped with an image acquisition unit, and the flow channel is equipped with a flow velocity detection unit. The server runs a biometric module and a weight calculation module. The image acquisition unit continuously acquires images of underwater organisms flowing through the guide channel; the biometrics module processes the acquired images using an artificial intelligence image recognition algorithm to identify the species, quantity, and size information of the underwater organisms; the weight calculation module calculates the total weight of the underwater organisms flowing through the channel within the measurement time based on the species, quantity, and size information of the underwater organisms identified by the biometrics module, combined with the water flow velocity obtained by the flow velocity detection unit, thereby achieving real-time optical weighing of the underwater organisms.

[0007] Optionally, the image acquisition unit includes a light source compartment and an imaging compartment, which are arranged in parallel within the mounting frame. The light source compartment provides backlight illumination to the imaging compartment and forms an imaging work area between the light source compartment and the imaging compartment.

[0008] Optionally, the guide channel is provided with a funnel-shaped guide port at one end near the backwash water channel of the pump station. The guide port is located at the front end of the imaging working area and is used to guide and constrain organisms in the water flow through the imaging working area. The inlet width of the guide port is consistent with the width of the backwash water channel of the pump station, and the outlet size of the guide channel is matched with the height and working distance of the imaging working area.

[0009] Optionally, the flow velocity detection unit is a flow meter installed at the rear end of the flow channel, which is used to measure the actual water flow velocity through the imaging working area, which is located between the flow inlet and the flow velocity detection unit.

[0010] Optionally, the mounting frame is equipped with an interception component, which is used to guide underwater organisms from the guide port into the imaging working area of ​​the image acquisition unit when the water volume in the backwash channel of the pump station exceeds the height of the guide port of the guide channel.

[0011] Optionally, the interception assembly includes an interception net, a swing frame, and an interception motor. The interception net is located above the flow guide and connected to one end of the swing frame. The swing frame is rotatably connected to the mounting frame, and the interception motor is connected to the mounting frame. When the water volume in the backwash channel of the pump station exceeds the height of the guide port, the intercepting motor drives the swing frame to swing in the direction close to the guide port, so that one end of the intercepting net enters the guide port and the intercepting net is arranged in an inclined state.

[0012] Optionally, a drive gear is mounted on the output shaft of the intercepting motor. The drive gear meshes with a driven gear that is rotatably connected to the mounting frame. The outer diameter of the drive gear is smaller than the outer diameter of the driven gear. The driven gear is used to drive the swing frame to swing so that the intercepting net can perform interception operations.

[0013] Optionally, the swing frame includes swing ribs welded to the interception net, and two swing plates, each rotatably connected to the mounting frame, are welded onto the swing ribs. A swing rod and a swing cylinder are welded between the two swing plates. The swing rod is arranged adjacent to the interception net, and the two swing cylinders are connected to the end of the swing plate away from the interception net. The driven gear is used to drive the swing plate to swing so that the interception net moves closer to or away from the guide port.

[0014] Optionally, one side of one of the swing plates is provided with two spaced-apart sensing rods, and the mounting bracket is equipped with two spaced-apart sensing switches for sensing the swing of the interception net into position, with each sensing rod corresponding to a sensing switch. The mounting bracket is equipped with a first cover and a second cover, the first cover being used to cover the inductive switch and the second cover being used to cover the intercepting motor.

[0015] Optionally, the mounting frame is equipped with a flushing assembly for flushing the interception net. The flushing assembly includes a flushing seat fixedly mounted on the mounting frame, and a plurality of flushing nozzles arranged in a straight line adjacent to the interception net are mounted on the flushing seat. A flushing water pipe communicating with the plurality of flushing nozzles is mounted on the bottom of the flushing seat.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides an underwater biological optical weighing device suitable for nuclear power plant backwashing pump stations. Through an image acquisition unit, it continuously acquires images of underwater organisms within the flow channel, overcoming the limitations of low sampling frequency in existing technologies. This allows for continuous data acquisition, preventing the omission of biological population phenomena, and is particularly suitable for nighttime operations, significantly improving the timeliness and reliability of monitoring. Utilizing an artificial intelligence image recognition algorithm in the biometric module, it can automatically identify the species, quantity, and size information of underwater organisms, solving the problem of existing mechanical weighing technologies being unable to identify species. This provides more comprehensive data support for the quality assessment of nuclear power plant cold source water, helping to promptly detect potential biological threats. By combining the water flow velocity obtained from the flow velocity detection unit with the species, quantity, and size information of underwater organisms output by the biometric module, the total weight of underwater organisms flowing through the channel during the measurement time is calculated. This avoids data errors caused by difficulties in controlling sampling time during manual sampling, achieving fully automatic and high-precision optical weighing. Therefore, this invention solves the problems of low sampling frequency and inability to detect biological species in real time when using existing weighing devices for underwater biological weighing in nuclear power plant backwashing pump stations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0019] Figure 1 This is one of the three-dimensional structural schematic diagrams of an underwater biological optical weighing device suitable for nuclear power plant backwashing pump stations provided by an embodiment of the present invention; Figure 2 A second three-dimensional structural schematic diagram of an underwater biological optical weighing device suitable for nuclear power plant backwashing pump stations provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the application structure of an underwater biological optical weighing device suitable for nuclear power plant backwashing pump stations, provided by an embodiment of the present invention. Figure 4A three-dimensional structural schematic diagram of an interception component in an underwater biological optical weighing device suitable for nuclear power plant backwashing pump stations, provided as an embodiment of the present invention; Figure 5 An exploded structural diagram of an interception component in an underwater biological optical weighing device suitable for nuclear power plant backwashing pump stations, provided as an embodiment of the present invention; Figure 6 This is a partial structural schematic diagram of an underwater biological optical weighing device suitable for nuclear power plant backwashing pump stations, provided by an embodiment of the present invention. Figure 7 for Figure 6 A magnified structural diagram at point A; Figure 8 This is a three-dimensional structural diagram of the flushing component in an underwater biological optical weighing device suitable for nuclear power plant backflushing pump stations, provided as an embodiment of the present invention.

[0020] Illustration: 10. Mounting bracket; 11. Flow channel; 111. Flow outlet; 12. Overflow channel; 20. Light source chamber; 30. Imaging cabin; 40. Flow meter; 50. Interception component; 51. Interception net; 52. Swing frame; 521. Swing rib; 522. Swing plate; 523. Swing rod; 524. Swing cylinder; 53. Interception motor; 54. Drive gear; 55. Driven gear; 56. Induction rod; 57. Induction switch; 58. First cover; 59. Second cover; 60. Flushing assembly; 61. Flushing seat; 62. Flushing nozzle; 63. Flushing water pipe; 100. Pump station backwashing water channel; 200. Pump station backwashing main canal; 300. Main canal protection plate. Detailed Implementation

[0021] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] This invention provides an underwater biological optical weighing device suitable for nuclear power plant backwashing pump stations, such as... Figures 1 to 8 As shown, the underwater biological optical weighing device includes a mounting frame 10 with a flow channel 11 and a server (not shown). The mounting frame 10 is mounted on the backwash water channel 100 of the pump station. The mounting frame 10 is equipped with an image acquisition unit, and the flow channel 11 is equipped with a flow velocity detection unit. The server runs a biometric module and a weight calculation module. The image acquisition unit continuously acquires images of underwater organisms flowing through the guide channel 11. The biometrics module processes the acquired images using an artificial intelligence image recognition algorithm to identify the species, quantity, and size of the underwater organisms. The weight calculation module calculates the total weight of the underwater organisms flowing through the channel within the measurement time, based on the species, quantity, and size information identified by the biometrics module and combined with the water flow velocity obtained by the flow velocity detection unit, thus achieving real-time optical weighing of the underwater organisms. In this embodiment, several pump station backwash channels 100 are distributed on the pump station backwash main channel 200, and the pump station backwash main channel 200 is also covered with a main channel protection plate 300. The server is a well-known structure in the art and will not be described further here.

[0025] It should be noted that the underwater biological optical weighing device provided by this invention, applicable to nuclear power plant backwashing pump stations, continuously acquires images of underwater organisms within the flow channel 11 through an image acquisition unit. This overcomes the limitations of low sampling frequency in existing technologies, enabling continuous data acquisition and avoiding missing biological population phenomena. It is particularly suitable for nighttime operations, significantly improving the timeliness and reliability of monitoring. Utilizing the artificial intelligence image recognition algorithm in the biometric module, it can automatically identify the species, quantity, and size information of underwater organisms, solving the problem that existing mechanical weighing technologies cannot identify species. This provides more comprehensive data support for the quality assessment of nuclear power plant cold source water and helps to promptly detect potential biological threats. By combining the water flow velocity obtained by the flow velocity detection unit with the species, quantity, and size information of underwater organisms output by the biometric module, the total weight of underwater organisms flowing through the channel during the measurement time is calculated. This avoids data errors caused by difficulties in controlling sampling time during manual sampling, achieving fully automatic and high-precision optical weighing. Therefore, this invention solves the problems of low sampling frequency and inability to detect biological species in real time when using weighing devices for underwater biological weighing in nuclear power plant backwashing pump stations.

[0026] Specifically, an image acquisition unit utilizing backlight imaging technology clearly images organisms and seaweed in the canal's flow. A well-known artificial intelligence image recognition algorithm is then used to process the images, obtaining information on the species, quantity, and size of the organisms. This information is then substituted with parameters obtained from a physical model experiment to convert the organisms' two-dimensional information into three-dimensional information, from which their weight is calculated. Each frame captured at high speed represents the water volume within the imaging working area. In this example, the physical model experiment is a well-known experiment, and its specific experimental process will not be elaborated further.

[0027] The weight calculation module uses the following formula to calculate weight: ; In the formula: V 单 A single frame of an image represents the volume of water, measured in ml; L 物 W is the object field of view length, measured in cm. 物 L is the width of the object's field of view, measured in cm. 工 This is the working distance of the image acquisition unit, measured in centimeters.

[0028] In addition, by combining the shooting frequency of the image acquisition unit with the flow velocity data of the water body measured by the current meter 40, the proportion of the water volume represented by the acquired image to the total water volume of the channel is calculated. Finally, the total number and weight of underwater organisms during the measurement time are calculated. The specific calculation formula is as follows: ; ; ; In the formula: W 总 It is the total weight of underwater organisms during the measurement period, measured in grams (g); S 目 It is the total area of ​​the target object in the image acquired within the measurement time, and the unit is cm. 2 A is the target object area conversion factor, with units of g / cm². 2 The target object area conversion factor is a set of data obtained from the results of the physical model experiment. Different target objects (such as shrimp, jellyfish, seaweed, fish, etc.) have different corresponding coefficients; V 采总 V represents the total volume of water captured within the measurement time, measured in ml. 水总 The unit is the total volume of water flowing through the measurement time, in ml; F is the sampling frequency, in Hz; T is the measurement time, in seconds; S 截 The cross-sectional area of ​​the backwash water channel of the pump station is measured in cm². 2 V 水 It is the flow velocity of the water measured by the flow meter 40, and the unit is cm / s.

[0029] like Figure 1 and Figure 2 As shown, the image acquisition unit includes a light source compartment 20 and an imaging compartment 30. The light source compartment 20 and the imaging compartment 30 are arranged in parallel within the mounting frame 10. The light source compartment 20 is used to provide backlight illumination to the imaging compartment 30 and forms an imaging working area between the light source compartment 20 and the imaging compartment 30.

[0030] In practical implementation, the light source chamber 20 provides dedicated backlighting to the imaging chamber 30, illuminating the underwater organisms in the imaging work area into clear silhouettes. This imaging method greatly simplifies the complexity of image processing, making the outlines of organisms very clear and easy to extract. This lays a solid foundation for the subsequent biometric module to accurately identify the number, size, and morphological characteristics of organisms, forming a controlled and standardized imaging environment independent of external ambient light. The parallel arrangement of the light source chamber 20 and the imaging chamber 30 ensures the stability of the imaging field of view, avoiding measurement errors caused by angular distortion. Through the design of the above structure, this invention creates a stable and controllable optical imaging environment, solving the problem of poor underwater optical monitoring performance, ensuring the accuracy, reliability, and real-time performance of biometric identification and optical weighing, and ultimately providing solid data support for the safety of nuclear power cold sources.

[0031] like Figures 1 to 3 As shown, the guide channel 11 is provided with a funnel-shaped guide port 111 at one end near the backwash water channel 100 of the pump station. The guide port 111 is located at the front end of the imaging working area and is used to guide and constrain the organisms in the water flow through the imaging working area. The inlet width of the guide port 111 is consistent with the width of the backwash water channel 100 of the pump station, and the outlet size of the guide channel 11 matches the height and working distance of the imaging working area.

[0032] In practical implementation, since the inlet width of the guide port 111 is completely consistent with the width of the channel, a seamless transition is formed. This forces the water flow across the entire channel cross-section and the underwater organisms contained therein into the guide channel 11. The guide channel has a funnel-shaped design, which can smoothly contract the water flow, constraining and converging the underwater organisms to an outlet whose size matches the imaging working area. This ensures that the underwater organisms must pass through a restricted imaging working area with a fixed cross-section, avoiding image size magnification or reduction due to distance changes. This keeps the pixel-to-physical size conversion relationship constant, greatly improving the accuracy of size measurement. The restricted space reduces the organisms' degrees of freedom in the depth direction and the possibility of tumbling, causing them to mostly pass through the imaging working area in a relatively stable posture (such as sideways). This helps the biometric module to more accurately identify the species and measure their characteristic dimensions. Because the outlet size of the guide channel 11 matches the height and working distance of the imaging working area, the image acquisition unit can capture clear and complete silhouette images in optimal condition. This provides a standardized, high-quality input source for subsequent artificial intelligence image recognition algorithms, further improving the accuracy and efficiency of species identification, quantity statistics, and size measurement of underwater organisms.

[0033] like Figure 2 and Figure 6 As shown, the flow velocity detection unit is a flow meter 40 and is installed at the bottom of the rear end of the flow channel 11. It is used to measure the actual flow velocity of the water flowing through the imaging working area, which is located between the flow port 111 and the flow velocity detection unit.

[0034] In practice, the flowmeter 40 is installed directly after the imaging working area. It measures the actual velocity of the water flow that just carried the identified and measured organism through the imaging working area. This allows the weight calculation module to use the most directly relevant and real-time flow velocity data, eliminating calculation errors caused by improper flow velocity measurement location and ensuring the reliability of the optical weighing results. The horn-shaped guide port 111 alters the water flow state, potentially causing the flow velocity in the imaging working area to differ from the external channel flow velocity. Placing the flowmeter 40 at the rear of the channel measures the final, resulting flow velocity after adjustment by the entire guide structure. This design actively calibrates and incorporates the influence of the guide channel 11 itself on the water flow, making the entire measurement system (from the guide inlet to the flowmeter 40 outlet) an independent, self-consistent measurement black box. Regardless of changes in the external channel flow velocity, the system always measures the actual flow rate passing through this black box, thereby greatly improving the measurement consistency and reliability of the entire device under different operating conditions.

[0035] like Figures 1 to 7 As shown, the mounting frame 10 is equipped with an interception component 50. The interception component 50 is used to guide underwater organisms from the guide port 111 into the imaging working area of ​​the image acquisition unit when the water volume in the backwash channel 100 of the pump station exceeds the height of the guide port 111 of the guide channel 11.

[0036] In practice, when the backwash water volume increases and the water level exceeds the conventional design height of the guide port 111, a large amount of water and underwater organisms will overflow from above the guide port 111, unable to enter the imaging working area, causing the system's monitoring function to temporarily fail and resulting in serious data loss. The interception component 50, as an active guiding mechanism, starts working when the water level rises. Its physical structure can intercept underwater organisms overflowing from above and effectively guide them downwards into the guide port 111, thus entering the imaging working area. This significantly extends the effective working range of the optical weighing device, enabling it to function continuously not only at normal flow rates but also during peak flow periods of pump station backwashing. This ensures the continuity and integrity of data acquisition.

[0037] like Figures 4 to 7 As shown, the interception assembly 50 includes an interception net 51, a swing frame 52, and an interception motor 53. The interception net 51 is located above the flow guide 111 and connected to one end of the swing frame 52. The swing frame 52 is rotatably connected to the mounting frame 10, and the interception motor 53 is connected to the mounting frame 10. When the water volume in the backwash channel 100 of the pump station exceeds the height of the guide port 111, the intercepting motor 53 drives the swing frame 52 to swing in a direction close to the guide port 111, so that one end of the intercepting net 51 enters the guide port 111 and the intercepting net 51 is arranged in an inclined state. In this embodiment, the mounting frame 10 is provided with overflow channels 12 that are spaced apart from the guide channel 11, and the height of the overflow channels 12 is higher than the height of the guide channel 11.

[0038] In practice, the interceptor motor 53 drives the swing frame 52, enabling the interceptor net 51 to be dynamically and on-demand deployed. When the water level sensor (or inferred from the flow rate) detects that the water level exceeds the guide port 111, the interceptor motor 53 starts, precisely swinging the interceptor net 51 into the guide port 111 and forming the optimal tilt angle. This proactive intervention ensures that at high water levels, the interceptor net 51 is in the most effective position, forming a funnel to efficiently and completely guide underwater organisms into the imaging working area. At normal water levels, the interceptor net 51 can be retracted without interfering with the water flow, allowing the system to operate with minimal resistance and in its most natural state, reducing unnecessary energy loss and equipment wear. The overflow channel 12 acts as a safety pressure relief valve, preventing the guide channel 11 and the internal precision optical imaging unit from being impacted by overloaded high-speed water flow, thus protecting the equipment. By diverting excess water, the flow rate through the imaging work area is kept within a reasonable range suitable for optical measurements, thus ensuring that image clarity and dimensional measurement accuracy are not affected by peak water flow.

[0039] like Figures 4 to 7 As shown, a drive gear 54 is mounted on the output shaft of the interception motor 53. The drive gear 54 meshes with a driven gear 55 that is rotatably connected to the mounting bracket 10. The outer diameter of the drive gear 54 is smaller than the outer diameter of the driven gear 55. The driven gear 55 is used to drive the swing bracket 52 to swing so that the interception net 51 can perform interception operations.

[0040] In practical implementation, if the swing speed of the interceptor net 51 is too fast, it will generate a huge water hammer effect, which will not only impact the interceptor net 51 and the swing frame 52 themselves, but may also cause violent disturbances in the water flow, temporarily affecting the flow field stability of the imaging area. By adopting a design where the outer diameter of the driving gear 54 is smaller than that of the driven gear 55, a reduction gear pair is formed. Its core function is to reduce the output speed while proportionally amplifying the output torque. This structural design allows the system to use a standard model motor that is smaller in size, has a higher speed, but lower torque. The gear pair converts it into a low-speed, high-torque output, meeting the requirement of slowly and powerfully pushing the interceptor net 51. This makes the overall structure more compact and the cost lower.

[0041] like Figures 4 to 7 As shown, the swing frame 52 includes a swing rib 521 welded to the interception net 51. Two swing plates 522, both rotatably connected to the mounting frame 10, are welded onto the swing rib 521. A swing rod 523 and a swing cylinder 524 are welded between the two swing plates 522. In this embodiment, the middle part of the swing plate 522 is rotatably connected to the mounting frame 10. Among them, the swing rod 523 is arranged adjacent to the interception net 51, the two swing cylinders 524 are connected to the end of the swing plate 522 away from the interception net 51, and the driven gear 55 is used to drive the swing plate 522 to swing so that the interception net 51 is closer to or away from the guide port 111.

[0042] In practical implementation, two parallel swing plates 522 are welded together with swing ribs 521, swing rods 523, and swing cylinders 524 to form a high-rigidity composite structure. This frame effectively distributes the enormous water pressure and impact force borne by the interception net 51 to the two swing plates 522 and their rotating shafts, greatly avoiding single-point overload and structural deformation, and ensuring the stability of the shape of the interception net 51. Since the middle part of the swing plate 522 is rotatably connected to the mounting bracket 10, it forms a lever. The driven gear 55 drives one end of the swing plate 522 (the end where the swing cylinder 524 is installed), and the interception net 51 is installed at the other end of the lever arm. This lever design allows the interception net 51 end to obtain a larger swing stroke than the driving end, while the speed is slower, which matches the requirement that the interception net 51 needs to move a larger range into the guide port 111.

[0043] like Figure 7 As shown, one side of one of the swing plates 522 is provided with two spaced sensing rods 56, and the mounting bracket 10 is equipped with two spaced sensing switches 57 for sensing the swing position of the interception net 51. The sensing rods 56 and the sensing switches 57 correspond one-to-one. The mounting bracket 10 is equipped with a first cover 58 and a second cover 59. The first cover 58 is used to cover the inductive switch 57, and the second cover 59 is used to cover the interceptor motor 53.

[0044] In practical implementation, two inductive switches 57 correspond one-to-one with two inductive rods 56, defining two key endpoint positions of the interceptor net 51's movement (such as fully deployed interception and fully retracted). When the inductive rod 56 moves with the swing plate 522 into the detection range of the inductive switch 57, the system immediately receives a clear electrical signal, accurately determining that the interceptor net 51 has reached its correct position, and then controls the interceptor motor 53 to stop working. This eliminates positional uncertainty and ensures that the interceptor net 51 is always at the optimal working angle. This makes the control system form a closed loop from command to execution to feedback, greatly improving the reliability and repeatability of the action. The server can record and display the status of the interceptor net 51 in real time, realizing remote status monitoring of the interceptor component 50.

[0045] Furthermore, the precision inductive switch 57 is completely enclosed by the first housing 58, and the intercepting motor 53 and its gear transmission mechanism are completely enclosed by the second housing 59. The sealed housings effectively isolate water vapor, salt spray, and corrosive gases, significantly extending the service life of the intercepting motor 53 and the inductive switch 57, and ensuring their long-term stable operation in harsh underwater environments.

[0046] like Figure 6 and Figure 8 As shown, a flushing assembly 60 for flushing the interception net 51 is installed on the mounting frame 10. The flushing assembly 60 includes a flushing seat 61 fixedly installed on the mounting frame 10. A plurality of flushing nozzles 62 are installed on the flushing seat 61 and arranged in a straight line adjacent to the interception net 51. A flushing water pipe 63 communicating with the plurality of flushing nozzles 62 is installed at the bottom of the flushing seat 61. In this embodiment, the flushing water pipe 63 is in contact with the inner wall of the overflow channel 12.

[0047] In practice, a series of flushing nozzles 62 arranged in a straight line form a flushing water curtain covering the working area of ​​the interception net 51, providing regular and automatic high-pressure flushing to the net surface. This effectively removes marine organisms, plastics, and other debris entangled in the net, preventing and eliminating mesh blockage and maintaining the permeability of the interception net 51. This flushing action can be controlled in conjunction with the movement of the interception net 51. For example, the flushing program can be automatically activated when the interception net 51 completes an interception task, begins to retract, or is retracted to a specific position. The flushing nozzles 62 are arranged in a straight line and adjacent to the interception net 51. This design ensures that the high-pressure water flow acts precisely and concentratedly on the entire net surface, avoiding water waste and energy loss. Integrating all the flushing nozzles 62 into a single flushing base 61 and supplying water through a single flushing water pipe 63 at the bottom makes the flushing assembly 60 very compact and reliable, easy to install and maintain in confined spaces.

[0048] Working Principle: This invention provides an underwater biological optical weighing device suitable for nuclear power plant backwashing pump stations. Through an image acquisition unit, it continuously acquires images of underwater organisms within the flow channel 11, overcoming the limitations of low sampling frequency in existing technologies. This allows for continuous data acquisition, avoiding missed biomass phenomena, and is particularly suitable for nighttime operations, significantly improving the timeliness and reliability of monitoring. Utilizing an artificial intelligence image recognition algorithm in the biometric module, it automatically identifies the species, quantity, and size information of underwater organisms, solving the problem of existing mechanical weighing technologies being unable to identify species. This provides more comprehensive data support for nuclear power plant cold source water quality assessment and helps in the timely detection of potential biological threats. By combining the water flow velocity obtained from the flow velocity detection unit with the species, quantity, and size information of underwater organisms output by the biometric module, the total weight of underwater organisms flowing through the channel during the measurement time is calculated. This avoids data errors caused by difficulties in controlling sampling time during manual sampling, achieving fully automatic and high-precision optical weighing. Therefore, this invention solves the problems of low sampling frequency and inability to detect biological species in real time when using existing weighing devices for underwater biological weighing in nuclear power plant backwashing pump stations.

[0049] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An underwater bio-optical weighing device suitable for use in a nuclear power backwash pump station, characterized in that, The underwater biological optical weighing device comprises a mounting frame (10) provided with a flow guide channel (11) and a server, the mounting frame (10) is arranged on a pump station backwashing water channel (100), an image acquisition unit is arranged on the mounting frame (10), a flow velocity detection unit is arranged in the flow guide channel (11), and a biological recognition module and a weight calculation module are run on the server. The image acquisition unit continuously acquires images of underwater organisms flowing through the flow guide channel (11); the biological recognition module processes the acquired images according to an artificial intelligence image recognition algorithm to recognize the species, quantity and size information of the underwater organisms; and the weight calculation module calculates the total weight of the underwater organisms flowing through the water channel in a measurement time according to the species, quantity and size information of the underwater organisms recognized by the biological recognition module and the water flow velocity acquired by the flow velocity detection unit, so as to realize real-time optical weighing of the underwater organisms.

2. The underwater bio-optical weighing device suitable for nuclear power backwash pump station according to claim 1, characterized in that, The image acquisition unit comprises a light source cabin (20) and an imaging cabin (30), the light source cabin (20) and the imaging cabin (30) are arranged in parallel in the mounting frame (10), the light source cabin (20) is used for providing backlight illumination for the imaging cabin (30), and an imaging working area is formed between the light source cabin (20) and the imaging cabin (30).

3. The underwater bio-optical weighing device suitable for nuclear power backwash pump station according to claim 2, characterized in that, The flow guide channel (11) is provided with a flow guide opening (111) in a horn shape at one end close to the pump station backwashing water channel (100), the flow guide opening (111) is located at the front end of the imaging working area, and the flow guide opening (111) is used for guiding and restraining the organisms in the water flow to pass through the imaging working area. The inlet width of the flow guide opening (111) is consistent with the width of the pump station backwashing water channel (100), and the outlet size of the flow guide channel (11) is matched with the height and working distance of the imaging working area.

4. The underwater bio-optical weighing device suitable for nuclear power backwash pump station according to claim 2 or 3, characterized in that, The flow velocity detection unit is a flow velocity meter (40) and is installed at the bottom of the rear end of the flow guide channel (11), is used for measuring the actual water flow velocity flowing through the imaging working area, and the imaging working area is located between the flow guide opening (111) and the flow velocity detection unit.

5. The underwater bio-optical weighing device suitable for nuclear power backwash pump station according to any one of claims 1 to 3, characterized in that, The mounting frame (10) is provided with an interception assembly (50), the interception assembly (50) is used for guiding the underwater organisms from the flow guide opening (111) into the imaging working area of the image acquisition unit when the water quantity in the pump station backwashing water channel (100) exceeds the height of the flow guide opening (111) of the flow guide channel (11).

6. The underwater bio-optical weighing device suitable for nuclear power backwash pump station according to claim 5, characterized in that, The interception assembly (50) comprises an interception net (51), a swing frame (52) and an interception motor (53), the interception net (51) is located above the flow guide opening (111) and is connected to one end of the swing frame (52), the swing frame (52) is rotationally connected to the mounting frame (10), and the interception motor (53) is connected to the mounting frame (10). When the water amount in the pump station backwashing water channel (100) exceeds the height of the guide port (111), the intercepting motor (53) is used to drive the swing frame (52) to swing in the direction close to the guide port (111), so that one end of the intercepting net (51) enters the guide port (111) and the intercepting net (51) is arranged in an inclined state.

7. The underwater bio-optical weighing device suitable for nuclear power backwash pump station according to claim 6, characterized in that, The output shaft of the intercepting motor (53) is provided with a driving gear (54), the driving gear (54) is engaged with a driven gear (55) rotationally connected with the mounting frame (10), the outer diameter of the driving gear (54) is smaller than the outer diameter of the driven gear (55), and the driven gear (55) is used to drive the swing frame (52) to swing, so that the intercepting net (51) performs the intercepting operation.

8. The underwater bio-optical weighing device suitable for nuclear power backwash pump station according to claim 7, characterized in that, The swing frame (52) comprises a swing rib (521) welded with the intercepting net (51), two swing plates (522) rotationally connected with the mounting frame (10) are welded on the swing rib (521), and a swing rod (523) and a swing cylinder (524) are welded between the two swing plates (522); The swing rod (523) is arranged adjacent to the intercepting net (51), the two swing cylinders (524) are connected to one end of the swing plate (522) away from the intercepting net (51), and the driven gear (55) is used to drive the swing plate (522) to swing, so that the intercepting net (51) is close to or away from the guide port (111).

9. The underwater bio-optical weighing device suitable for nuclear power backwash pump station according to claim 8, characterized in that, One side of one of the swing plates (522) is provided with two spaced apart induction rods (56), the mounting frame (10) is provided with two spaced apart induction switches (57) for sensing that the intercepting net (51) is swung into position, and the induction rods (56) correspond one-to-one to the induction switches (57). The mounting frame (10) is provided with a first cover (58) and a second cover (59), the first cover (58) is used to cover the induction switch (57), and the second cover (59) is used to cover the intercepting motor (53).

10. The underwater bio-optical weighing device suitable for nuclear power backwash pump station according to claim 5, characterized in that, The mounting frame (10) is provided with a flushing assembly (60) for flushing the intercepting net (51), the flushing assembly (60) comprises a flushing seat (61) fixedly installed on the mounting frame (10), a plurality of flushing nozzles (62) arranged adjacent to the intercepting net (51) and arranged in a straight line are installed on the flushing seat (61), and a flushing water pipe (63) in communication with the plurality of flushing nozzles (62) is installed at the bottom of the flushing seat (61).

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