A device and method for inspecting damage to double-layer aquaculture net cages

Abstract

This invention relates to a damage inspection device for double-layer fishing net aquaculture cages, comprising an inner cage frame, an outer cage frame, an inner net layer, and an outer net layer, with the inner and outer net layers enclosing multiple rectangular areas. A damage inspection device is installed within each rectangular area. Each damage inspection device includes a displacement drive system and a positioning detection device. The displacement drive system drives the positioning detection device to move along a planned route within the rectangular area. The positioning detection device includes a detection box, a detection roller assembly, a pressure sensor assembly, and a GPS positioning system. The detection roller assembly includes inner and outer detection rollers, with a distance L1 between the inner and outer detection rollers greater than the width L0 of the rectangular area, allowing the double-layer net layer to be stretched. This invention can detect the integrity of the fishing net based on the pressure signal between the net layer and the detection rollers, detect damage to the double-layer net layer in real time, promptly report the location and size of the damage, and facilitate repairs to effectively avoid economic losses.

Description

Technical Field

[0001] This invention relates to the field of fishing net production technology, specifically to a device and method for inspecting damage to double-layer fishing net aquaculture cages. Background Technology

[0002] With the continuous development of fisheries, underwater cage aquaculture is an important means of utilizing marine resources for high-quality production and a crucial direction for the sustainable development of fisheries. Currently, there are over 1 million cages nationwide, with a fishery output exceeding 160,000 tons. Due to the complexity of the aquaculture environment, if damage to the netting, especially in large deep-sea aquaculture cages, is not detected and repaired in time, the escape of farmed fish can cause huge economic losses. Therefore, netting safety is one of the key issues to be addressed in the application and promotion of deep-sea cage aquaculture technology.

[0003] Conventional fishing net damage detection schemes are mainly divided into three categories: (1) Sonar is used to detect the damage of the fishing net. If the fishing net is damaged, the sound wave reflection image inside and outside the net cage will change significantly. Its disadvantage is that it cannot accurately locate the damaged position of the net cage, and large-scale fish activities will affect the detection results. (2) Underwater cameras are used to conduct optical detection around the net cage. Its disadvantage is that optical detection has requirements for water quality. (3) Metal wire embedding method is used to detect the damage of the net by the continuity of the metal wire. When the net is damaged, the metal wire will form a circuit with the seawater and the electrode entering the sea, triggering the alarm device and outputting the net cage number and the damaged part of the net. Its disadvantage is that the detection cost is high. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a double-layer fishing net aquaculture cage damage inspection device and method to address the shortcomings of the existing technology. It can realize unmanned real-time inspection of fishing net damage, accurately locate the location and extent of damage, and has low detection cost. It is suitable for aquaculture cages of all water depths.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] A damage inspection device for double-layer fishing net aquaculture cages, comprising an inner cage frame, an outer cage frame, an inner net layer, and an outer net layer. The inner net layer is tensioned on the inner cage frame, and the outer net layer is tensioned on the outer cage frame. Multiple rectangular areas are formed between the inner and outer net layers, each with a width L0. One damage inspection device is installed within each rectangular area. Each damage inspection device includes a displacement driving system and a positioning detection device. The displacement driving system drives the positioning detection device to move along a planned route within the rectangular area. The positioning detection device includes a detection box, a detection roller assembly, a pressure sensor assembly, and a GPS positioning system. The wheel assembly includes an inner layer detection roller and an outer layer detection roller respectively installed on the inner and outer surfaces of the detection box. The distance L1 between the inner and outer layer detection rollers is greater than the width L0 of the rectangular area, causing the detection roller assembly to stretch the originally tensioned double-layer mesh. The pressure sensor assembly includes an inner layer pressure sensor installed on the inner layer detection roller and an outer layer pressure sensor installed on the outer layer detection roller. The inner layer pressure sensor is used to detect the pressure between the inner layer detection roller and the inner layer mesh, and the outer layer pressure sensor is used to detect the pressure between the outer layer detection roller and the outer layer mesh. The GPS positioning system is installed inside the detection box and is used to transmit the real-time location information of the detection box to the control center.

[0007] In the above scheme, the positioning detection device also includes a sonar installed on the detection box.

[0008] In the above scheme, the positioning detection device also includes an optical detection device installed on the detection box.

[0009] In the above scheme, L1 is 1.1 to 1.2 times L0.

[0010] In the above scheme, both the inner and outer net cage frames are cubes. The inner and outer netting are installed on the four sides of the inner and outer net cage frames respectively to form a double-layer fishing net, and a single-layer netting is arranged on the top and bottom.

[0011] In the above scheme, the displacement driving system includes a horizontal power driving system, a mounting system, and a vertical power driving system; the horizontal power driving system has two layers, respectively located at the top and bottom of the cage frame; the mounting system has two layers, respectively mounted on the top horizontal power driving system and the bottom horizontal power driving system, and adjusts the horizontal displacement of the mounting system through the horizontal power driving system; the vertical power driving system is mounted between the top mounting system and the bottom mounting system; the positioning detection device is mounted on the vertical power driving system, and adjusts the vertical displacement of the positioning detection device through the vertical power driving system.

[0012] In the above scheme, each layer of the horizontal power drive system includes a horizontal drive motor, a speed-regulating pulley, a horizontal belt, and a support column. There are two horizontal drive motors, which are symmetrically installed at both ends of the rectangular area through the support column. A set of speed-regulating pulleys is installed at the output end of each horizontal drive motor. The horizontal belt meshes with the speed-regulating pulleys at both ends. By rotating the speed-regulating pulleys forward and backward, the horizontal belt is driven to move horizontally.

[0013] In the above scheme, each layer of the mounting system includes two sets of parallel and spaced mounting devices. Each set of mounting devices includes two rollers, two horizontal shafts, two fixed blocks, a connecting support frame, and a belt fixing angle steel. The two rollers are respectively embedded in the slide rails formed by the inner and outer mesh cage frames, and can slide along the slide rails under the action of external force. A horizontal shaft is connected to the outside of each roller, and a fixed block is connected to the outside of the horizontal shaft. The connecting support frame is fixed between the two fixed blocks and is used to mount the vertical power drive system. The belt fixing angle steel is used to connect the fixed blocks and the horizontal belt.

[0014] In the above scheme, the vertical power drive system includes a vertical drive motor, a rolling roller, and a vertical belt. A set of vertical drive motors and rolling rollers are mounted on the top and bottom two-layer mounting systems respectively. The rolling rollers are installed between the connecting support frames of the two sets of parallel mounting devices, and the vertical drive motors are installed inside the connecting support frames to drive the rolling rollers to rotate. The vertical belt meshes with the upper and lower sets of rolling rollers, and the detection box of the positioning detection device is fixed on the vertical belt. The forward and reverse rotation of the rolling rollers drives the positioning detection device to move vertically.

[0015] Accordingly, this invention also proposes a method for inspecting damage to double-layer fishing net aquaculture cages, using the aforementioned damage inspection device, comprising the following steps:

[0016] S1. The damage inspection device is activated, and all equipment is powered on.

[0017] S2. The positioning detection device is automatically controlled to move horizontally and vertically according to the planned path, and the horizontal and vertical positions of the detection box are adjusted. The inner detection roller and the outer detection roller roll tightly against the inner mesh and the outer mesh respectively. The inner pressure sensor and the outer pressure sensor detect the pressure between the inner detection roller and the inner mesh and the pressure signal between the outer detection roller and the outer mesh respectively. The GPS positioning system transmits the real-time position information of the detection box to the control center.

[0018] If there is a pressure signal, it means the fishing net is intact;

[0019] If no pressure signal is detected, it indicates that the fishing net may be damaged. The positioning detection device records and reports the location area where no pressure signal is detected. Then, the sonar on the detection box is activated to make a preliminary judgment on whether the net structure is damaged by the sonar signal. Then, the optical detection device on the detection box is activated to take pictures of the net and detect the specific degree of damage to the net.

[0020] S3. After inspecting the fishing net along the planned path for one week, the damage inspection device returns to its initial position and prepares to start the next round of inspection.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. The double-layer fishing net aquaculture cage damage inspection device of the present invention can detect the integrity of the fishing net based on the pressure signal between the net and the detection roller, detect the damage of the double-layer net in real time, and promptly report the location and size of the damage, so as to repair it and effectively avoid economic losses. This invention has no requirements for the underwater detection environment or weather conditions, can achieve 24-hour fully automatic patrol, and can achieve full coverage of deep-sea aquaculture cage inspection operations.

[0023] 2. This invention uses pressure signals to initially determine the possible location of damage to the fishing net, and then uses sonar and optical detection devices to conduct detailed detection of the degree of damage, thereby extending the working life of the sonar and optical detection devices, reducing costs, and increasing detection speed and efficiency.

[0024] 3. This invention uses a displacement drive system to drive the damage inspection device to move horizontally and vertically along a planned path, thereby achieving full coverage inspection of the double-layer mesh. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the frame structure of the double-layer fishing net aquaculture cage in this invention;

[0027] Figure 2 This is a schematic diagram of the double-layer fishing net structure of the double-layer fishing net aquaculture cage in this invention;

[0028] Figure 3 This is a top view of the double-layer fishing net aquaculture cage in this invention;

[0029] Figure 4 This is a schematic diagram of the installation of the fishing net damage inspection device in this invention;

[0030] Figure 5 This is a schematic diagram of the upper horizontal power drive system and the vertical power drive system of the fishing net damage inspection device of the present invention;

[0031] Figure 6 This is a schematic diagram of the lower horizontal power drive system and the vertical power drive system of the fishing net damage inspection device of the present invention;

[0032] Figure 7 This is a schematic diagram of the positioning and detection device of the fishing net damage inspection device in this invention;

[0033] Figure 8 This is a flowchart of the overall detection process of the fishing net damage inspection device in this invention.

[0034] In the picture: 1. Double-layered aquaculture cage; 11. Inner cage frame; 12. Outer cage frame; 13. Inner netting; 14. Outer netting.

[0035] 2. Damage inspection device; 21. Horizontal power drive system; 211. Horizontal drive motor; 212. Speed ​​regulating pulley; 213. Horizontal belt; 214. Support column;

[0036] 22. Mounting system; 221. Roller; 222. Horizontal shaft; 223. Fixing block; 224. Connecting support frame; 225. Belt fixing angle steel;

[0037] 23. Vertical power drive system; 231. Vertical drive motor; 232. Rolling roller; 233. Vertical belt;

[0038] 24. Positioning detection device; 241. Detection box; 242. Roller protective shell; 243. Detection roller; 244. Pressure sensor; 245. GPS positioning system; 246. Sonar; 247. Optical detection device. Detailed Implementation

[0039] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0040] This invention provides a device for inspecting damage to double-layer fishing net aquaculture cages, such as... Figure 1-3 As shown, the double-layer fishing net aquaculture cage 1 includes a cage frame consisting of an inner cage frame 11 and an outer cage frame 12, and a double-layer net consisting of an inner net 13 and an outer net 14. Both the inner cage frame 11 and the outer cage frame 12 are cubes. The inner net 13 and the outer net 14 are respectively installed on the four sides of the inner cage frame 11 and the outer cage frame 12 to form a double-layer fishing net. The inner net 13 is tensioned on the inner cage frame 11, and the outer net 14 is tensioned on the outer cage frame 12. A single layer of net is placed on the top and bottom of the cage frame. The inner net 13 and the outer net 14 enclose four rectangular areas, and the gap between the two layers of net is the width L0 of the rectangular area. For ease of observation, Figure 2Only the double-layered fishing net around the four sides of the double-layered aquaculture cage 1 is shown in the drawing; the single-layered fishing nets at the top and bottom of the cage are not included. Figure 2 Draw it out in the middle.

[0041] One damage inspection device 2 is installed within each rectangular area to detect whether the double-layer mesh is damaged. To make the installation location of the damage inspection device 2 easier to see, Figure 4 The image shows only two rectangular areas of the damage inspection device 2. Each damage inspection device 2 includes a displacement drive system and a positioning detection device 24. The displacement drive system is used to drive the positioning detection device 24 to move along a planned route within the rectangular area. Figure 7 As shown, the positioning detection device 24 includes a detection box 241, a set of detection rollers 243, a set of pressure sensors 244, and a GPS positioning system 245. The set of detection rollers 243 includes an inner layer detection roller 243 and an outer layer detection roller 243 respectively installed on the inner and outer surfaces of the detection box 241. The horizontal distance L1 between the inner layer detection roller 243 and the outer layer detection roller 243 is greater than the width L0 of the rectangular area, causing the set of detection rollers 243 to stretch the originally taut double-layer mesh fabric. The pressure sensor 244... The 44 sets include an inner layer pressure sensor 244 mounted on the inner layer detection roller 243 and an outer layer pressure sensor 244 mounted on the outer layer detection roller 243. The inner layer pressure sensor 244 is used to detect the pressure between the inner layer detection roller 243 and the inner layer mesh 13, and the outer layer pressure sensor 244 is used to detect the pressure between the outer layer detection roller 243 and the outer layer mesh 14. The GPS positioning system 245 is installed inside the detection box 241 and is used to transmit the real-time location information of the detection box 241 to the control center.

[0042] The detection principle of the damage inspection device 2 is as follows: Since the distance L1 between the inner and outer detection rollers 243 is greater than the width L0 of the rectangular area, the detection rollers 243 will stretch the taut net during movement. Pressure is constantly present between the detection rollers 243 and the net. The pressure sensor 244 on the device detects whether there is a pressure signal between the net and the detection rollers 243, thus determining whether the net is intact. If there is a pressure signal, it indicates that the double-layered net is intact and undamaged; if there is no pressure signal, it indicates that one side of the double-layered fishing net is damaged or both layers are damaged. The GPS positioning system 245 then transmits the damage location information to the control center.

[0043] For further optimization, the positioning and detection device 24 also includes a sonar 246 and an optical detection device 247 mounted on the detection box 241. During the detection process, if a pressure signal is lost, the sonar 246 is activated to preliminarily determine the extent of damage to the mesh. Then, the optical detection device 247 is activated to take a photograph of the mesh and determine the specific degree of damage.

[0044] Further optimization includes a roller protective shell 242 on the positioning detection device 24. The roller protective shell 242 is fixed to the detection box 241 and is used to fix the position between the detection roller 243 and the detection box 241 without affecting the rotation of the detection roller 243. One side of the detection roller 243 is located inside the roller protective shell 242, and the other side is in close contact with the mesh.

[0045] Further optimization involves making the detection roller 243 a cylindrical foam roller.

[0046] Further optimization resulted in L1 being 1.1 to 1.2 times L0.

[0047] Further optimization is achieved by including a horizontal power drive system 21, a mounting system 22, and a vertical power drive system 23. The horizontal power drive system 21 has two layers, respectively located at the top and bottom of the cage frame; the mounting system 22 also has two layers, respectively mounted on the top and bottom horizontal power drive systems 21, adjusting the horizontal displacement of the mounting system 22 via the horizontal power drive system 21; the vertical power drive system 23 is mounted between the top and bottom mounting systems 22; and a positioning detection device 24 is mounted on the vertical power drive system 23, adjusting its vertical displacement via the vertical power drive system 23.

[0048] Further optimization, such as Figure 5-6 As shown, each layer of the horizontal power drive system 21 includes a horizontal drive motor 211, a speed-regulating pulley 212, a horizontal belt 213, and a support column 214. There are two horizontal drive motors 211, which are symmetrically installed at both ends of the rectangular area via the support column 214. A set of speed-regulating pulleys 212 is installed at the output end of each horizontal drive motor 211. The horizontal belt 213 meshes with the speed-regulating pulleys 212 at both ends. By rotating the speed-regulating pulleys 212 forward and backward, the horizontal belt 213 is driven to move horizontally.

[0049] Further optimization involves each layer of the mounting system 22 comprising two sets of parallel, spaced-apart mounting devices. Each set of mounting devices includes two rollers 221, two horizontal shafts 222, two fixing blocks 223, a connecting support frame 224, and a belt fixing angle steel 225. The cross-sections of the inner mesh cage frame 11 and the outer mesh cage frame 12 are both steel groove-shaped structures, with symmetrically arranged grooves forming slide rails for embedding the rollers 221 of the mounting devices to adjust the horizontal position of the positioning detection device 24. The two rollers 221 of the mounting devices are respectively embedded in the slide rails formed by the inner mesh cage frame 11 and the outer mesh cage frame 12, and can slide along the slide rails under the action of external force. A horizontal shaft 222 is connected to the outside of each roller 221, and a fixing block 223 is connected to the outside of the horizontal shaft 222. The connecting support frame 224 is fixed between the two fixing blocks 223 for mounting the vertical power drive system 23. The belt fixing angle steel 225 is used to connect the fixing blocks 223 and the horizontal belt 213. Driven by the horizontal belt 213, the roller 221 slides in the slide rail, thereby driving the mounting system 22 to move in the horizontal direction.

[0050] Further optimization is achieved by the vertical power drive system 23, which includes a vertical drive motor 231, a rolling roller 232, and a vertical belt 233. A set of vertical drive motors 231 and rolling rollers 232 are mounted on the top and bottom two-layer mounting systems 22, respectively. The rolling rollers 232 are installed between the connecting support frames 224 of the two parallel mounting devices, and the vertical drive motors 231 are installed inside the connecting support frames 224 to drive the rolling rollers 232 to rotate. The vertical belt 233 meshes with the upper and lower sets of rolling rollers 232. The detection box 241 of the positioning detection device 24 is fixed on the vertical belt 233. The forward and reverse rotation of the rolling rollers 232 drives the positioning detection device 24 to move vertically.

[0051] Accordingly, the present invention also proposes an inspection method for the aforementioned double-layer fishing net aquaculture cage 1 damage inspection device 2, such as... Figure 8 As shown, it includes the following steps:

[0052] S1. Damage inspection device 2 is activated, and all equipment is powered on;

[0053] S2. The positioning and detection device 24 is automatically controlled to move horizontally and vertically according to the planned path, and the horizontal and vertical positions of the detection box 241 are adjusted. The inner detection roller 243 and the outer detection roller 243 roll close to the inner mesh 13 and the outer mesh 14 respectively. The inner pressure sensor 244 and the outer pressure sensor 244 detect the pressure between the inner detection roller 243 and the inner mesh 13 and the pressure signal between the outer detection roller 243 and the outer mesh 14 respectively. The GPS positioning system 245 transmits the real-time position information of the detection box 241 to the control center.

[0054] If there is a pressure signal, it means the fishing net is intact;

[0055] If no pressure signal is detected, it indicates that the fishing net may be damaged. The positioning detection device 24 records and reports the location area of ​​the no pressure signal. Then, the sonar 246 mounted on the detection box 241 is turned on, and the sonar 246 signal is used to make a preliminary judgment on whether the net structure is damaged. Then, the optical detection device 247 mounted on the detection box 241 is turned on, and the optical detection device 247 takes a picture of the net to detect the specific degree of damage to the net.

[0056] S3. After inspecting the fishing net along the planned path for one week, the damage inspection device 2 returns to its initial position and prepares to start the next round of inspection.

[0057] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0058] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A device for inspecting damage to double-layer fishing net aquaculture cages, characterized in that, The double-layer fishing net aquaculture cage includes an inner cage frame, an outer cage frame, an inner net and an outer net. The inner net is tensioned on the inner cage frame, and the outer net is tensioned on the outer cage frame. The inner and outer nets enclose multiple rectangular areas, and the width of each rectangular area is L0. One of the aforementioned damage inspection devices is installed within each rectangular area. Each damage inspection device includes a displacement driving system and a positioning detection device. The displacement driving system drives the positioning detection device to move along a planned route within the rectangular area. The positioning detection device includes a detection box, a detection roller assembly, a pressure sensor assembly, and a GPS positioning system. The detection roller assembly includes an inner detection roller and an outer detection roller respectively installed on the inner and outer surfaces of the detection box. The distance L1 between the inner and outer detection rollers is greater than the width L0 of the rectangular area, causing the detection roller assembly to stretch the originally tensioned double-layer mesh. The pressure sensor assembly includes an inner pressure sensor installed on the inner detection roller and an outer pressure sensor installed on the outer detection roller. The inner pressure sensor detects the pressure between the inner detection roller and the inner mesh, and the outer pressure sensor detects the pressure between the outer detection roller and the outer mesh. The GPS positioning system is installed inside the detection box and is used to transmit the real-time location information of the detection box to the control center.

2. The double-layer fishing net aquaculture cage damage inspection device according to claim 1, characterized in that, The positioning detection device also includes a sonar installed on the detection box.

3. The double-layer fishing net aquaculture cage damage inspection device according to claim 1, characterized in that, The positioning detection device also includes an optical detection device installed on the detection box.

4. The double-layer fishing net aquaculture cage damage inspection device according to claim 1, characterized in that, L1 is 1.1 to 1.2 times L0.

5. The double-layer fishing net aquaculture cage damage inspection device according to claim 1, characterized in that, Both the inner and outer net cage frames are cubes. The inner and outer netting are installed on the four sides of the inner and outer net cage frames respectively to form a double-layer fishing net, and a single-layer netting is arranged on the top and bottom.

6. The double-layer fishing net aquaculture cage damage inspection device according to claim 1, characterized in that, The displacement driving system includes a horizontal power driving system, a mounting system, and a vertical power driving system. The horizontal power driving system has two layers, respectively located at the top and bottom of the cage frame. The mounting system also has two layers, respectively mounted on the top and bottom horizontal power driving systems, and adjusts the horizontal displacement of the mounting system through the horizontal power driving system. The vertical power driving system is mounted between the top and bottom mounting systems. The positioning detection device is mounted on the vertical power driving system, and adjusts the vertical displacement of the positioning detection device through the vertical power driving system.

7. The double-layer fishing net aquaculture cage damage inspection device according to claim 6, characterized in that, Each layer of the horizontal power drive system includes a horizontal drive motor, a speed-regulating pulley, a horizontal belt, and a support column. There are two horizontal drive motors, which are symmetrically installed at both ends of the rectangular area via the support column. A set of speed-regulating pulleys is installed at the output end of each horizontal drive motor. The horizontal belt meshes with the speed-regulating pulleys at both ends. By rotating the speed-regulating pulleys forward and backward, the horizontal belt is driven to move horizontally.

8. The double-layer fishing net aquaculture cage damage inspection device according to claim 7, characterized in that, Each layer of the mounting system includes two sets of parallel and spaced mounting devices. Each set of mounting devices includes two rollers, two horizontal shafts, two fixed blocks, a connecting support frame, and a belt fixing angle steel. The two rollers are respectively embedded in the slide rails formed by the inner and outer mesh cage frames, and can slide along the slide rails under the action of external force. A horizontal shaft is connected to the outside of each roller, and a fixed block is connected to the outside of the horizontal shaft. The connecting support frame is fixed between the two fixed blocks and is used to mount the vertical power drive system. The belt fixing angle steel is used to connect the fixed blocks and the horizontal belt.

9. The double-layer fishing net aquaculture cage damage inspection device according to claim 8, characterized in that, The vertical power drive system includes a vertical drive motor, a rolling roller, and a vertical belt. A set of vertical drive motors and rolling rollers are mounted on the top and bottom mounting systems respectively. The rolling rollers are installed between the connecting support frames of the two parallel mounting devices, and the vertical drive motors are installed inside the connecting support frames to drive the rolling rollers to rotate. The vertical belt meshes with the upper and lower sets of rolling rollers. The detection box of the positioning detection device is fixed on the vertical belt, and the vertical movement of the positioning detection device is driven by the forward and reverse rotation of the rolling rollers.

10. A method for inspecting damage to double-layer fishing net aquaculture cages, characterized in that, The damage inspection device according to any one of claims 1-9 includes the following steps: S1. The damage inspection device is activated, and all equipment is powered on. S2. The positioning detection device is automatically controlled to move horizontally and vertically according to the planned path, and the horizontal and vertical positions of the detection box are adjusted. The inner detection roller and the outer detection roller roll tightly against the inner mesh and the outer mesh respectively. The inner pressure sensor and the outer pressure sensor detect the pressure between the inner detection roller and the inner mesh and the pressure signal between the outer detection roller and the outer mesh respectively. The GPS positioning system transmits the real-time position information of the detection box to the control center. If there is a pressure signal, it means the fishing net is intact; If no pressure signal is detected, it indicates that the fishing net may be damaged. The positioning detection device records and reports the location area where no pressure signal is detected. Then, the sonar on the detection box is activated to make a preliminary judgment on whether the net structure is damaged by the sonar signal. Then, the optical detection device on the detection box is activated to take pictures of the net and detect the specific degree of damage to the net. S3. After inspecting the fishing net along the planned path for one week, the damage inspection device returns to its initial position and prepares to start the next round of inspection.

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