Ship underwater detection device

Abstract

The invention relates to the technical field of ship underwater detection, in particular to a ship underwater detection device which comprises a fixing plate, the bottom of the fixing plate is connected with an underwater sonar device through a connecting rod, and a cleaning mechanism is arranged on one side of the underwater sonar device. The cleaning mechanism comprises a first connecting strip driven by a motor, an extrusion block, a hollow strip and a second connecting plate, a first cleaning brush and a second cleaning brush are arranged on the second connecting plate, the cleaning brushes are driven by the motor to move up and down, and dirt and impurities on the surface of the underwater sonar device are removed; the waterproof cylinder is connected with the protective shell through the connecting block, and the protective shell can move up and down to cover or expose the underwater sonar device, so that the stability is enhanced. According to the invention, the problems that the underwater sonar device is easy to adhere impurities and is insufficient in stability are solved, and the detection precision and reliability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater detection of ships, and specifically provides an underwater detection device for ships. Background Technique

[0002] A ship is a general term for various vessels. A ship is a means of transportation that can navigate or berth in waters for transportation or operation. It has different technical performances, equipment, and structural forms according to different usage requirements. A ship is a man-made means of transportation mainly operating in geographical waters. When a ship is traveling on the water surface, sonar needs to be used for detection to effectively identify and locate underwater objects such as submarines, fish schools, and reefs, so as to prevent the ship from colliding with reefs; After retrieval, a Chinese patent with the publication number CN215794361U discloses an underwater inspection device for ships. When underwater inspection is required during ship travel, specifically, the controller controls the first motor to start, the first motor drives the gear to rotate, the gear meshes with the moving frame. When the gear rotates forward, it drives the moving frame to move downward, drives the sonar to move downward through the connecting rod, the first sliding plate and the second sliding plate slide downward in the chute. When the first sliding plate and the second sliding plate move downward, the first transmission rope and the second transmission rope are stressed, pulling the first cover plate to move leftward along the slide rail, pulling the second cover plate to move rightward along the slide rail, compressing the first spring and the second spring, so that the first through hole on the slide rail is exposed. Therefore, the sonar moves downward through the first through hole. At this time, the controller controls the second motor to start, and the second motor drives the sonar to rotate, so that the sonar rotates and detects in the water. When underwater inspection is not required, the pushing device drives the sonar to move upward, so that the sonar is arranged inside the housing; However, there are still the following problems: 1. The gear drives the moving frame to move downward, and then drives the sonar to move downward together, so that the sonar is placed in the water for detection. However, when the sonar moves with the ship in the water, the sonar device itself is prone to adhering to dirt, marine organisms, sediment and other impurities, which will affect the normal use of the sonar and reduce the detection effect; 2. The sonar is protected by the housing, but since the housing is fixed while the sonar is moving, the sonar is not stable enough at the bottom of the ship.

[0003] In view of this, we propose an underwater detection device for ships. Summary of the Invention

[0004] The purpose of the present invention is to provide an underwater detection device for ships to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: An underwater detection device for a ship, comprising a fixing plate, a connecting rod is fixedly connected to the bottom of the fixing plate, an underwater sonar device is fixedly connected to the bottom of the connecting rod, and a cleaning mechanism is arranged on one side of the underwater sonar device; waterproof cylinders are fixedly connected to the four corners of the bottom of the fixing plate, a connecting block is fixedly connected to the bottom of the waterproof cylinder, and a protective shell is fixedly connected to the top of the connecting block.

[0006] Preferably, the cleaning mechanism includes a first connecting plate, the top of the first connecting plate is fixedly connected to the bottom of the fixing plate, a motor is fixedly installed on the first connecting plate, a first connecting bar is fixedly connected to the output shaft of the motor, an extrusion block is fixedly connected to one side of the first connecting bar, a hollow bar is arranged on the surface of the extrusion block, a second connecting bar is fixedly connected to the bottom of the hollow bar, a second connecting plate is fixedly connected to the bottom of the second connecting bar, a first cleaning brush and a second cleaning brush are symmetrically arranged on one side of the second connecting plate close to the underwater sonar device, a limiting rod is fixedly connected to the bottom of the fixing plate, sliding blocks are fixedly connected to both ends of the hollow bar, and the inner cavity of the sliding block is slidably connected to the surface of the limiting rod.

[0007] Preferably, n-shaped plates are fixedly connected to the tops of the ends of the first cleaning brush and the second cleaning brush far away from the hollow bar, a reinforcing bar is fixedly connected to one side of the n-shaped plate close to the hollow bar, and the other end of the reinforcing bar is fixedly connected to one side of the hollow bar.

[0008] Preferably, first hollow blocks are fixedly connected to both ends of the second connecting plate, second hollow blocks are respectively fixedly connected to the ends of the first cleaning brush and the second cleaning brush close to the second connecting plate, and bolts are threadedly connected to the inner cavities of the first hollow block and the second hollow block.

[0009] Preferably, a bottom plate is fixedly connected to the inner cavity of the protective shell, and first through holes are formed in the surfaces of the protective shell and the bottom plate.

[0010] Preferably, a streamlined flow guide cover is fixedly installed on one side of the protective shell, second through holes are uniformly formed in the flow guide cover, and an anti-fouling coating is coated on the outer side of the flow guide cover.

[0011] Preferably, a cutting component is arranged inside the flow guide cover, the cutting component includes a waterproof electric cylinder, a cutting plate and a cutting knife, the waterproof electric cylinder is fixedly installed on the top of the outer wall of the protective shell close to the flow guide cover through a mounting frame, the output end of the waterproof electric cylinder is fixedly connected to the cutting plate, a cutting knife is fixedly installed at the bottom of the cutting plate, guide grooves are symmetrically formed inside the flow guide cover, both ends of the cutting plate are slidably arranged in the guide grooves, and an underwater camera is arranged on the inner top wall of the flow guide cover, and the underwater camera is electrically connected to a control device inside the ship hull.

[0012] Preferably, a hollow groove is formed on the surface of the second connecting plate, and a third cleaning brush is fixedly arranged in the inner cavity of the hollow groove.

[0013] Preferably, a waterproof housing is arranged on the surface of the motor, and the bottom of the waterproof housing is fixedly connected to the inner cavity of the first connecting plate.

[0014] Preferably, a fixing rod is fixedly connected to the surface of the underwater sonar device, the top of the fixing rod is fixedly connected to the bottom of the fixing plate, the fixing rod is symmetrically arranged in a V shape, and the middle of the fixing rod is fixedly connected to the surface of the connecting rod.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The underwater detection device of the ship drives the first connecting strip to rotate through the motor, and the first connecting strip will drive the hollow strip to perform a circular motion through the extrusion block. At the same time, the hollow strip will drive the second connecting strip and the second connecting plate to move together, and the second connecting plate will drive the first cleaning brush and the second cleaning brush to move together, realizing the cleaning of impurities on the surface of the underwater sonar device, so that the impurities will not affect the normal use of the underwater sonar device, and solving the problem that when the underwater sonar device moves with the ship in the water, the underwater sonar device itself is prone to adhering to dirt, marine organisms and sediment and other impurities, and these impurities will affect the normal use of the underwater sonar device, resulting in a reduction in the detection effect.

[0016] 2. The waterproof cylinder of the underwater detection device of the ship drives the protective shell to move downward through the connecting block, realizing that the underwater sonar device can be normally detected, and solving the problem that the protective shell is fixed while the underwater sonar device moves, resulting in the underwater sonar device being unstable at the bottom of the ship.

[0017] 3. The underwater detection device of the ship is connected to the inside of the first hollow block and the second hollow block through bolts, achieving the function of connecting the second connecting plate, the first cleaning brush and the second cleaning brush, facilitating the disassembly of the first cleaning brush and the second cleaning brush, and driving the third cleaning brush to move up and down through the hollow groove, achieving the cleaning of one side of the underwater sonar device and improving the cleaning range.

[0018] 4. The underwater detection device of the ship blocks the bottom of the protective shell through the bottom plate, achieving that moving animals such as fish schools are not easily entered into the inside of the protective shell, and avoiding damage to the underwater sonar device caused by fish schools.

[0019] 5. The underwater detection device of the ship effectively reduces the risk of entanglement of fishing nets, waterweeds and other sundries through the design of the streamlined fairing and the anti-fouling coating, optimizes the water flow direction, avoids the formation of eddy currents, and the cutting assembly can quickly cut off the sundries through the cutting knife when they enter the fairing, preventing entanglement and blockage. The underwater camera monitors the inside of the fairing in real time, facilitating the timely handling of problems. Description of the Drawings

[0020] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the overall structural sectional view of the present invention; Figure 3 is the three-dimensional structural schematic diagram of the n-shaped plate in the present invention; Figure 4 is the sectional structural schematic diagram of the waterproof shell in the present invention; Figure 5 is the three-dimensional structural schematic diagram of the limiting rod in the present invention; Figure 6 is the connection structural schematic diagram of the first hollow block and the second hollow block in the present invention; Figure 7 is the overall structural schematic diagram of the flow deflector in the present invention; Figure 8 is the internal structural schematic diagram of the flow deflector in the present invention.

[0021] In the figure: 1, fixed plate; 2, connecting rod; 3, underwater sonar device; 4, cleaning mechanism; 401, first connecting plate; 402, motor; 403, first connecting strip; 404, extrusion block; 405, hollow strip; 406, second connecting strip; 407, second connecting plate; 408, first cleaning brush; 409, second cleaning brush; 410, slider; 411, limiting rod; 5, waterproof cylinder; 6, connecting block; 7, protective shell; 71, flow deflector; 711, guiding groove; 712, underwater camera; 72, second through hole; 73, waterproof electric cylinder; 74, cutting plate; 75, cutting knife; 8, n-shaped plate; 9, reinforcing strip; 10, first hollow block; 11, second hollow block; 12, bolt; 13, bottom plate; 14, first through hole; 15, waterproof shell; 16, fixed rod; 17, hollow groove; 18, third cleaning brush. Detailed Embodiment

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0024] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", and "set" should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "several" is two or more unless otherwise clearly and specifically defined.

[0026] Example 1: Please refer to Figures 1 - 6 As shown, the present invention provides a technical solution: An underwater detection device for ships, including a fixed plate 1. A connecting rod 2 is fixedly connected to the bottom of the fixed plate 1. An underwater sonar device 3 is fixedly connected to the bottom of the connecting rod 2. A cleaning mechanism 4 is arranged on one side of the underwater sonar device 3; Furthermore, the cleaning mechanism 4 includes a first connecting plate 401. The top of the first connecting plate 401 is fixedly connected to the bottom of the fixed plate 1. A motor 402 is fixedly installed on the first connecting plate 401. The output shaft of the motor 402 is fixedly connected to a first connecting bar 403. A pressing block 404 is fixedly connected to one side of the first connecting bar 403. A hollow bar 405 is arranged on the surface of the pressing block 404. A second connecting bar 406 is fixedly connected to the bottom of the hollow bar 405. A second connecting plate 407 is fixedly connected to the bottom of the second connecting bar 406. A first cleaning brush 408 and a second cleaning brush 409 are symmetrically arranged on one side of the second connecting plate 407 close to the underwater sonar device 3. A limiting rod 411 is fixedly connected to the bottom of the fixed plate 1. Sliders 410 are fixedly connected to both ends of the hollow bar 405. The inner cavity of the slider 410 is slidably connected to the surface of the limiting rod 411; It should be noted that the fixed plate 1 can be welded to the bottom of the ship, and the fixed plate 1 can also be connected to the underwater sonar device 3 through the connecting rod 2, so that the underwater sonar device 3 can also be located at the bottom of the ship to detect the water body and avoid colliding with objects such as fish schools and reefs. The first connecting plate 401 is connected to the bottom of the fixed plate 1 and can be used to support the motor 402, and the motor 402 can drive the first connecting bar 403 to rotate. The extrusion block 404 is fixed to one side of the first connecting bar 403 and is in a Z shape with the first connecting bar 403 and the motor 402, so that the motor 402 can drive the extrusion block 404 to perform a circular motion. When the extrusion block 404 rotates, it can be used to drive the hollow bar 405 to move up and down. The second connecting bar 406 can connect the hollow bar 405 and the second connecting plate 407, so that the second connecting plate 407 can move up and down. One side of the second connecting plate 407 is connected to the first cleaning brush 408 and the second cleaning brush 409, and the first cleaning brush 408 and the second cleaning brush 409 are respectively located on both sides of the underwater sonar device 3. When the first cleaning brush 408 and the second cleaning brush 409 are driven by the second connecting plate 407 to move up and down, the impurities adhered to the surface of the underwater sonar device 3 can be cleaned, so that the impurities will not affect the normal use of the underwater sonar device 3. The limiting rod 411 can limit the hollow bar 405 through the slider 410, so that when the extrusion block 404 squeezes the hollow bar 405 to move, the hollow bar 405 is not easily displaced.

[0027] It is worth noting that in this technical solution, both the first cleaning brush 408 and the second cleaning brush 409 adopt deformable brush heads, which can better adapt to the uneven surface of the sonar device and improve the cleaning efficiency.

[0028] In this embodiment, waterproof cylinders 5 are fixedly connected to the four corners of the bottom of the fixed plate 1, a connecting block 6 is fixedly connected to the bottom of the waterproof cylinder 5, and a protective shell 7 is fixedly connected to the top of the connecting block 6; The waterproof cylinder 5 can connect the protective shell 7 through the connecting block 6, so that the protective shell 7 can be moved to the surface of the underwater sonar device 3 by moving up and down, thereby playing a protective role for the underwater sonar device 3. At the same time, the waterproof cylinder 5 can also drive the protective shell 7 to move down, so that the underwater sonar device 3 can perform normal detection. At the same time, the underwater sonar device 3 does not need to move, making the underwater sonar device 3 more stable at the bottom of the fixed plate 1 and the ship.

[0029] In this embodiment, an n-shaped plate 8 is fixedly connected to the top of the ends of the first cleaning brush 408 and the second cleaning brush 409 away from the hollow bar 405. A reinforcing bar 9 is fixedly connected to the side of the n-shaped plate 8 close to the hollow bar 405, and the other end of the reinforcing bar 9 is fixedly connected to one side of the hollow bar 405; The N-shaped plate 8 can play a role in connecting the first cleaning brush 408 and the second cleaning brush 409, making the first cleaning brush 408 and the second cleaning brush 409 not prone to shaking and more stable. The reinforcing strip 9 can connect the hollow strip 405 and the N-shaped plate 8, enabling the N-shaped plate 8 to be stable above the first cleaning brush 408 and the second cleaning brush 409.

[0030] In this embodiment, first hollow blocks 10 are fixedly connected to both ends of the second connecting plate 407. Second hollow blocks 11 are respectively fixedly connected to one ends of the first cleaning brush 408 and the second cleaning brush 409 close to the second connecting plate 407. A bolt 12 is threadedly connected to the inner cavities of the first hollow block 10 and the second hollow block 11; The bolt 12 can be connected to the interiors of the first hollow block 10 and the second hollow block 11 to achieve the function of connecting the second connecting plate 407 and the first cleaning brush 408 and the second cleaning brush 409. At the same time, the bolt 12 can also be rotated to disengage from the first hollow block 10 and the second hollow block 11, thus facilitating the disassembly of the first cleaning brush 408 and the second cleaning brush 409.

[0031] In this embodiment, a bottom plate 13 is fixedly connected to the inner cavity of the protective shell 7. First through holes 14 are formed in the surfaces of the protective shell 7 and the bottom plate 13; It should be noted that the bottom plate 13 can be used to block the bottom of the protective shell 7, making it difficult for moving objects such as fish schools to enter the interior of the protective shell 7, and thus not easily damaging the underwater sonar device 3. The first through holes 14 facilitate the free flow of water in the protective shell 7.

[0032] In this embodiment, a hollow groove 17 is formed in the surface of the second connecting plate 407. A third cleaning brush 18 is fixedly arranged in the inner cavity of the hollow groove 17; The interior of the hollow groove 17 can be used to install the third cleaning brush 18, and the third cleaning brush 18 can be driven by the second connecting plate 407 to move up and down, so as to clean one side of the underwater sonar device 3 and improve the cleaning range.

[0033] In this embodiment, a waterproof shell 15 is arranged on the surface of the motor 402. The bottom of the waterproof shell 15 is fixedly connected to the inner cavity of the first connecting plate 401; The waterproof shell 15 can play a role in protecting the motor 402, making it difficult for the motor 402 to take in water in water and thus not easily damaged.

[0034] In this embodiment, a fixed rod 16 is fixedly connected to the surface of the underwater sonar device 3. The top of the fixed rod 16 is fixedly connected to the bottom of the fixing plate 1; Furthermore, the fixed rod 16 is in a V shape arranged symmetrically, and the middle part of the fixed rod 16 is fixedly connected to the surface of the connecting rod 2; The fixed rod 16 is in a V shape arranged symmetrically. The upper and lower sides and the middle part of the fixed rod 16 are respectively connected to the surfaces of the fixed plate 1, the underwater sonar device 3 and the connecting rod 2, which can play a role in strengthening the connection between the fixed plate 1, the underwater sonar device 3 and the connecting rod 2, making the underwater sonar device 3 more firmly at the bottom of the connecting rod 2.

[0035] When the underwater detection device of this embodiment is in use, first weld the fixed plate 1 to the bottom of the ship, so that the underwater sonar device 3 can also be stable under the ship. Then the underwater sonar device 3 can detect the water to prevent the ship from colliding with objects such as fish schools and reefs. When impurities adhere to the underwater sonar device 3 in the water, the motor 402 can be started first to drive the first connecting bar 403 to rotate, and the first connecting bar 403 will drive the hollow bar 405 to perform a circular motion through the extrusion block 404. At the same time, the hollow bar 405 will drive the second connecting bar 406 and the second connecting plate 407 to move together. At the same time, the hollow bar 405 will also drive the slider 410 to slide on the surface of the limiting rod 411. When the second connecting plate 407 moves, it will drive the first cleaning brush 408 and the second cleaning brush 409 to move together, and the first cleaning brush 408 and the second cleaning brush 409 will move on the surface of the underwater sonar device 3 to clean the impurities adhered to the surface of the underwater sonar device 3, so that the impurities will not affect the normal use of the underwater sonar device 3. When the underwater sonar device 3 is not in use, the waterproof cylinder 5 can be started to drive the protective shell 7 to move upward through the connecting block 6 to play a protective role for the underwater sonar device 3. When the underwater sonar device 3 is in use for detection, the waterproof cylinder 5 can also drive the protective shell 7 to move downward, which will not block the underwater sonar device 3 and allow the underwater sonar device 3 to perform normal detection. At the same time, the underwater sonar device 3 does not need to move, making the underwater sonar device 3 more stable at the fixed plate 1 and the bottom of the ship. Thus, the problem that when the underwater sonar device 3 moves with the ship in the water, the underwater sonar device 3 itself is prone to adhering to dirt, marine organisms and sediment and other impurities, and these impurities will affect the normal use of the underwater sonar device 3 and reduce the detection effect can be solved.

[0036] Embodiment 2: On the basis of Embodiment 1, refer to Figure 7 、 8 A streamlined flow deflector 71 is fixedly installed on one side of the protective shell 7. Second through holes 72 are uniformly opened on the flow deflector 71, and an anti-fouling coating is coated on the outside of the flow deflector 71.

[0037] During use, the fairing 71 is installed on the side close to the bow. Through the design of the streamlined fairing 71, the raised structures are reduced to avoid snagging of fishing nets or waterweeds. And by optimizing the water flow direction, the formation of eddies is reduced to prevent the accumulation and entanglement of debris. The anti-fouling coating uses low-friction polytetrafluoroethylene or silicone-based coating to reduce the adhesion and friction coefficient, making it easier for the entangled objects to slip off. And the water flow can normally enter the protective shell 7 through the second through-hole 72 and the first through-hole 14. To further reduce the entry of debris, anti-entanglement grids can also be installed at the first through-hole 14 and the second through-hole 72 to allow the water flow to pass through but block the entry of larger debris.

[0038] Furthermore, a cutting assembly is arranged inside the fairing 71. The cutting assembly includes a waterproof electric cylinder 73, a cutting plate 74, and a cutting knife 75. The waterproof electric cylinder 73 is fixedly installed on the top of the outer wall of the protective shell 7 close to the fairing 71 through a mounting bracket. The output end of the waterproof electric cylinder 73 is fixedly connected to the cutting plate 74. The cutting knife 75 is fixedly installed at the bottom of the cutting plate 74. Guide grooves 711 are symmetrically formed inside the fairing 71. Both ends of the cutting plate 74 are slidably arranged in the guide grooves 711. An underwater camera 712 is arranged on the inner top wall of the fairing 71. The underwater camera 712 is electrically connected to the control device inside the hull.

[0039] The internal situation of the fairing 71 can be monitored through the underwater camera 712, and the real-time monitoring image is transmitted to the control device inside the hull. The staff can monitor the internal situation of the fairing 71 in real time. When waterweeds and other debris enter the fairing 71, the waterproof electric cylinder 73 can be started to drive the cutting plate 74 to reciprocate up and down, so as to control the cutting knife 75 to reciprocate to cut the waterweeds and prevent the entanglement of waterweeds and other debris inside the fairing 71.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only the preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An underwater detection device for a ship, comprising a fixing plate (1), characterized in that, The bottom of the fixed plate (1) is fixedly connected with a connecting rod (2), the bottom of the connecting rod (2) is fixedly connected with an underwater sonar device (3), a cleaning mechanism (4) is arranged on one side of the underwater sonar device (3), the four corners of the bottom of the fixed plate (1) are fixedly connected with waterproof cylinders (5), the bottom of the waterproof cylinders (5) is fixedly connected with a connecting block (6), and the top of the connecting block (6) is fixedly connected with a protective shell (7).

2. The underwater detection device for ships according to claim 1, wherein, The cleaning mechanism (4) includes a first connecting plate (401), the top of the first connecting plate (401) is fixedly connected to the bottom of the fixed plate (1), a motor (402) is fixedly installed on the first connecting plate (401), the output shaft of the motor (402) is fixedly connected with a first connecting bar (403), a pressing block (404) is fixedly connected to one side of the first connecting bar (403), a hollow bar (405) is arranged on the surface of the pressing block (404), the bottom of the hollow bar (405) is fixedly connected with a second connecting bar (406), the bottom of the second connecting bar (406) is fixedly connected with a second connecting plate (407), a first cleaning brush (408) and a second cleaning brush (409) are symmetrically arranged on one side of the second connecting plate (407) close to the underwater sonar device (3), a limiting rod (411) is fixedly connected to the bottom of the fixed plate (1), sliders (410) are fixedly connected to both ends of the hollow bar (405), and the inner cavity of the sliders (410) is slidably connected to the surface of the limiting rod (411).

3. The underwater detection device for ships according to claim 2, characterized in that, The top of the ends of the first cleaning brush (408) and the second cleaning brush (409) far from the hollow bar (405) is fixedly connected with an n-shaped plate (8), a reinforcing bar (9) is fixedly connected to one side of the n-shaped plate (8) close to the hollow bar (405), and the other end of the reinforcing bar (9) is fixedly connected to one side of the hollow bar (405).

4. The underwater detection device for ships according to claim 2, characterized in that, The two ends of the second connecting plate (407) are fixedly connected with first hollow blocks (10), the ends of the first cleaning brush (408) and the second cleaning brush (409) close to the second connecting plate (407) are respectively fixedly connected with second hollow blocks (11), and bolts (12) are threadedly connected to the inner cavities of the first hollow blocks (10) and the second hollow blocks (11).

5. The underwater detection device for ships according to claim 1, characterized in that, A bottom plate (13) is fixedly connected to the inner cavity of the protective shell (7), and first through holes (14) are formed in the surfaces of the protective shell (7) and the bottom plate (13).

6. The underwater detection device for ships according to claim 2, characterized in that, A streamlined flow guide cover (71) is fixedly installed on one side of the protective shell (7), second through holes (72) are evenly formed in the flow guide cover (71), and an anti-fouling coating is applied to the outside of the flow guide cover (71).

7. The underwater detection device for ships according to claim 6, characterized in that, A cutting assembly is arranged inside the fairing (71). The cutting assembly includes a waterproof electric cylinder (73), a cutting plate (74), and a cutting knife (75). The waterproof electric cylinder (73) is fixedly installed on the top of the outer wall of the protective shell (7) close to the fairing (71) through a mounting bracket. The output end of the waterproof electric cylinder (73) is fixedly connected to the cutting plate (74). The cutting knife (75) is fixedly installed at the bottom of the cutting plate (74). Guide grooves (711) are symmetrically formed inside the fairing (71). Both ends of the cutting plate (74) are slidably arranged in the guide grooves (711). An underwater camera (712) is arranged on the inner top wall of the fairing (71). The underwater camera (712) is electrically connected to a control device inside the hull.

8. The underwater detection device for ships according to claim 2, characterized in that, A hollow groove (17) is formed on the surface of the second connecting plate (407). A third cleaning brush (18) is fixedly arranged in the inner cavity of the hollow groove (17).

9. The underwater detection device for ships according to claim 2, characterized in that, A waterproof shell (15) is arranged on the surface of the motor (402). The bottom of the waterproof shell (15) is fixedly connected to the inner cavity of the first connecting plate (401).

10. The underwater detection device for ships according to claim 1, characterized in that, A fixing rod (16) is fixedly connected to the surface of the underwater sonar device (3). The top of the fixing rod (16) is fixedly connected to the bottom of the fixing plate (1). The fixing rod (16) is arranged in a symmetric V shape. The middle of the fixing rod (16) is fixedly connected to the surface of the connecting rod (2).

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