An underwater object detection and identification apparatus

Abstract

The application provides an underwater target detection and identification device, which comprises a chassis, a protective shell mounted on the upper surface of the chassis, a pressure-resistant noise reduction assembly arranged outside the protective shell, and a detection and identification assembly arranged between the pressure-resistant noise reduction assembly and the protective shell; the pressure-resistant noise reduction assembly comprises sliding mechanisms mounted on the upper and lower ends of the protective shell, a pressure-resistant mechanism arranged between the two sliding mechanisms, and a plurality of buffer mechanisms arranged between the pressure-resistant mechanism and the protective shell; the detection and identification assembly comprises a noise reduction shell mounted on the upper surface of the chassis, a detection and identification device mounted in the noise reduction shell, and a noise reduction mechanism arranged between the inner wall of the noise reduction shell and the outer surface of the detection and identification device. The application can change the pressure-resistant effect and the noise reduction effect according to the underwater environment, thereby improving the service life and the use precision of the underwater detection and identification device.

Description

TECHNICAL FIELD

[0001] The present application mainly relates to the technical field of underwater detection, and particularly relates to an underwater target detection and identification device. BACKGROUND

[0002] In recent years, the civil fields of submarine topography detection, large-area ocean monitoring, underwater information acquisition and the military fields of detecting enemy warships, submarines and aircraft carriers all need the support of underwater detection technology.

[0003] According to the underwater target detection method and device based on a seawater ion separation magnetic field model provided in the patent document with the application number CN202010940357.3, the detection device and method include: S1. constructing an ion motion model, a polarization current density model, and constructing a seawater ion motion magnetic field preliminary model, simplifying the constructed preliminary magnetic field model under the assumption of quasi-stability, and finally constructing a seawater ion motion magnetic field model based on the magnetic field strength and the seawater physicochemical environment parameters and the hydrodynamic disturbance parameters of the underwater target according to the ion motion model and the polarization current density model; S2. When detecting the underwater target, the seawater solution physicochemical parameters and the hydrodynamic disturbance parameters are obtained in real time and input into the seawater ion motion magnetic field model to obtain the seawater real-time magnetic field strength, and whether there is an underwater target is judged according to the obtained seawater real-time magnetic field strength. The detection device can realize target detection in seawater, and has high engineering realizability and detection precision.

[0004] The above-mentioned underwater detection device can realize target detection in seawater, and has high engineering realizability and detection precision, but the traditional detection device only resists the impact of external water flow and reduces noise by matching the shell of the detection device with a noise reduction layer, which leads to high requirements for the shell material of the detection device and the noise reduction layer filled therein. SUMMARY

[0005] The present application mainly provides an underwater target detection and identification device to solve the technical problems raised in the background art.

[0006] The technical solution adopted by the present application to solve the above technical problems is:

[0007] An underwater target detection and identification device, comprising a chassis, a protective shell mounted on the upper surface of the chassis, a compression-resistant noise reduction assembly provided on the outside of the protective shell, and a detection and identification assembly provided between the compression-resistant noise reduction assembly and the protective shell.

[0008] The compression-resistant noise reduction assembly comprises sliding mechanisms mounted on the upper and lower ends of the protective shell, a compression-resistant mechanism provided between the two sliding mechanisms, and a plurality of buffer mechanisms provided between the compression-resistant mechanism and the protective shell, wherein the plurality of buffer mechanisms are arranged around the axis of the protective shell.

[0009] The anti-pressing mechanism comprises an arc-shaped anti-pressing plate connected with the execution end of the buffering mechanism, and folding anti-pressing plates rotatably connected with both ends of the arc-shaped anti-pressing plate, and adjacent two folding anti-pressing plates are rotatably connected;

[0010] The detection and identification assembly comprises a noise reduction shell mounted on the upper surface of the chassis, a detection and identification device mounted in the noise reduction shell, and a noise reduction mechanism arranged between the inner wall of the noise reduction shell and the outer surface of the detection and identification device.

[0011] Further, the buffering mechanism comprises magnetorheological elastomer vibration isolators sequentially mounted on the outer surface of the protective shell from top to bottom, and spring shock absorbers arranged between two magnetorheological elastomer vibration isolators, the spring shock absorbers are mounted on the outer surface of the protective shell, and the spring shock absorbers and magnetorheological elastomer vibration isolators are connected with the side surface of the folding anti-pressing plate close to the protective shell, when the arc-shaped anti-pressing plate is impacted by water flow, the arc-shaped anti-pressing plate stores energy through the magnetorheological elastomer vibration isolators and spring shock absorbers, thereby prolonging the time of impact force transmission to the protective shell.

[0012] Further, the sliding mechanism comprises a support ring sleeved on the outer surface of the protective shell, a plurality of guide rails mounted on the outer surface of the support ring, and a pulley arranged in the guide rail and slidably connected with the inner wall of the guide rail, the pulley is rotatably connected with the arc-shaped anti-pressing plate on the same side through a rotating shaft, when the arc-shaped anti-pressing plate is displaced due to the impact of water flow, the arc-shaped anti-pressing plate slides on the guide rail through the pulley rotatably connected therewith, thereby providing guidance for the displacement of the arc-shaped anti-pressing plate.

[0013] Further, a displacement sensor is mounted at the top end of the pulley, when the pulley moves driven by the arc-shaped anti-pressing plate, the displacement of the arc-shaped anti-pressing plate is monitored through the displacement sensor.

[0014] Further, a plurality of first excitation coils are mounted at the top end of the inner wall of the protective shell, and a plurality of second excitation coils are mounted at the bottom end of the inner wall, the first excitation coils and the second excitation coils are arranged around the axis of the protective shell, the magnetic effect of the magnetorheological elastomer vibration isolator arranged in line with the first excitation coil is changed through the first excitation coil, and the magnetic effect of the magnetorheological elastomer vibration isolator arranged in line with the second excitation coil is changed through the second excitation coil.

[0015] Further, a noise reduction plate is arranged between the side surface of the folding anti-pressing plate close to the protective shell and the outer surface of the noise reduction shell, both ends of the noise reduction plate are connected with two folding anti-pressing plates respectively, the noise reduction plate is driven by the folding anti-pressing plate to approach the detection and identification device, thereby the detection and identification device is subjected to noise reduction treatment through the noise reduction plate.

[0016] Further, the noise reduction plate is arc-shaped, and the material of the noise reduction plate is EPDM rubber.

[0017] Further, the noise reduction mechanism comprises a noise reduction layer arranged between the detection identifier and the inner wall surface of the noise reduction shell, and an active noise reducer penetrating through the noise reduction layer shell and mounted on the inner wall surface of the noise reduction shell, the detection identifier is provided with a noise reduction function through the noise reduction layer, and when the displacement of the arc-shaped compression plate exceeds the set value stored therein, the active noise reducer in the detection identifier in the same direction as the arc-shaped compression plate is started to further strengthen through the active noise reducer.

[0018] Further, the material of the noise reduction layer is a high-molecular polyurethane material, and the thickness of the noise reduction layer is 20-30 mm.

[0019] Further, a power supply is mounted at the inner bottom end of the protective shell, and an identification machine is mounted on the upper surface of the power supply.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] Firstly, the present application can change the compression effect according to the underwater environment, thereby prolonging the service life of the underwater detection and identification equipment, specifically: the arc-shaped compression plate stores energy through the magneto-rheological elastomer vibration isolator and the spring shock absorber, thereby prolonging the time for the impact force to be transmitted to the protective shell, and further reducing the impact of the water flow on the protective shell, the magnetic effect of the magneto-rheological elastomer vibration isolator arranged in line with the first excitation coil is changed, the magnetic effect of the magneto-rheological elastomer vibration isolator arranged in line with the second excitation coil is changed, thereby adjusting the local stiffness of the magneto-rheological elastomer vibration isolator and changing the damping effect.

[0022] Secondly, the present application can change the noise reduction effect according to the underwater environment, thereby improving the use precision of the underwater detection and identification equipment, specifically: the detection identifier is provided with a noise reduction function through the noise reduction layer, and the active noise reducer in the detection identifier in the same direction as the arc-shaped compression plate is started, thereby further strengthening through the active noise reducer.

[0023] The present application will be explained in detail below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0025] Figure 2 It is a top view of the present application;

[0026] Figure 3 It is an enlarged view of the A area structure in Figure 2 ​

[0027] Figure 4 Structure diagram of sliding mechanism and compression-resistant mechanism of the present application;

[0028] Figure 5 Structure diagram of buffer mechanism of the present application;

[0029] Figure 6 Structure diagram of internal structure of protective shell of the present application;

[0030] Figure 7 Structure diagram of protective shell of the present application;

[0031] Figure 8 Structure diagram of detection and identification assembly of the present application.

[0032] In the figure: 10, chassis; 20, protective shell; 21, power supply; 22, identification machine; 23, first excitation coil; 24, second excitation coil; 30, compression-resistant and noise-reducing assembly; 31, sliding mechanism; 311, support ring; 312, guide rail; 313, guide rail; 314, displacement sensor; 32, compression-resistant mechanism; 321, arc-shaped compression-resistant plate; 322, folded compression-resistant plate; 323, noise-reducing plate; 33, buffer mechanism; 331, magneto-rheological elastomer vibration isolator; 332, spring shock absorber; 40, detection and identification assembly; 41, noise-reducing shell; 42, detection and identification device; 43, noise-reducing mechanism; 431, noise-reducing layer; 432, active noise reducer. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings, in which several embodiments of the present application are given, but the present application can be realized in different forms and is not limited to the embodiments described herein, on the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0034] It should be noted that when an element is referred to as being "fixedly attached" to another element, it can be directly on the other element or an intervening element can be present, and when an element is referred to as being "connected" to another element, it can be directly connected to the other element or an intervening element can be present, the terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs, the terminology used in the specification of the present application is for the purpose of describing specific embodiments and is not intended to limit the present application, the term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0036] Embodiments, please refer to the attached Figures 1-8 The utility model provides an underwater target detection and identification equipment, including the bottom disc 10, the upper surface of the bottom disc 10 is installed with the protective shell 20, the outside of the protective shell 20 is equipped with the compression resistance noise reduction component 30, and the compression resistance noise reduction component 30 is equipped with detection and identification component 40 between the protective shell 20,

[0037] Compression resistance noise reduction component 30 includes the sliding mechanism 31 installed on the upper and lower ends of the protective shell 20, is equipped with the compression resistance mechanism 32 between two sliding mechanism 31, and is equipped with a plurality of buffer mechanism 33 between the compression resistance mechanism 32 and the protective shell 20, and a plurality of buffer mechanism 33 is around the axis of the protective shell 20 is arranged;

[0038] Compression resistance mechanism 32 includes the arc compression resistance plate 321 connected with the execution end of buffer mechanism 33, and the folding compression resistance plate 322 is rotatably connected with both ends of arc compression resistance plate 321, and rotatably connected between adjacent two folding compression resistance plate 322;

[0039] Detection and identification component 40 includes the noise reduction shell 41 installed on the upper surface of the bottom disc 10, the detection and identification ware 42 installed in the noise reduction shell 41, and is equipped with the noise reduction mechanism 43 between the inner wall of the noise reduction shell 41 and the outer surface of the detection and identification ware 42,

[0040] It should be noted that in the present embodiment, after the underwater target detection and identification device is put into the water, the power supply 21 in the protective shell 20 and the temperature-depth, compass pressure sensor group, high-sensitivity micro-magnetic sensor module, preamplifier module, filter module, data acquisition module, and high-performance signal processor in one of the detection and identification devices 42 are packaged in the protective shell 20, the wireless beacon is fixed in the detection and identification device 42, the water-tight cable of the wireless beacon is connected with the power supply 21 and the high-performance signal processor inside the protective shell 20 through the water-tight connector, the data radio station is fixed in the detection and identification device 42 outside the protective shell 20, the water-tight cable of the data radio station is connected with the power supply 21 and the high-performance signal processor inside the protective shell 20 through the water-tight connector, the ultra-sensitivity vector hydrophone module is separately fixed and packaged in the cavity structure outside the protective shell 20, the ultra-sensitivity vector hydrophone module is connected with the power supply 21, preamplifier module, filter module, data acquisition module, and high-performance signal processor inside the protective shell 20 through the water-tight cable and water-tight connector, the power supply 21 supplies power to the temperature-depth, compass pressure sensor group, ultra-sensitivity vector hydrophone module, high-sensitivity micro-magnetic sensor module, preamplifier module, filter module, data acquisition module, high-performance signal processor, wireless VHF beacon, and data radio station, the temperature-depth, compass pressure sensor group measures the environmental and state parameters of water temperature, water depth, attitude, and pressure at the position of the submarine system on the seabed, the ultra-sensitivity vector hydrophone module senses the sound field information of the underwater target, the high-sensitivity micro-magnetic sensor module senses the magnetic field information of the underwater target, the preamplifier module amplifies the signals detected by the ultra-sensitivity vector hydrophone module and high-sensitivity micro-magnetic sensor module, the filter module filters the amplified signals, the data acquisition module AD converts the filtered signals, the high-performance signal processor has FPGA high-speed acquisition and transmission, DSP high-precision real-time calculation, ARM multi-sensor data fusion and recording, and the function is to process and analyze the converted signals, identify the type, position, and direction information of the underwater target, after receiving the upload instruction, the wireless VHF beacon is separated from the protective shell 20, floats to the water surface, and transmits the important data target direction, time, and other information back to the shore base, when the submarine system needs to be recovered, the data radio station of the deployment and recovery subsystem is positioned with the data radio station in the submarine system to realize recovery,

[0041] The underwater optical communication machine is fixed in the cavity structure of the protective shell 20 outside the submarine system protective shell 20, the electrical signal is connected with the power supply 21 and the high-performance signal processor inside the protective shell 20 through the water-tight cable and water-tight connector, when the original data needs to be transmitted, collected, and recorded at high speed and short distance, the ship-borne optical positioning communication deck unit and the underwater optical communication machine encryption coding are positioned to communicate, ensuring reliable and fast data transmission.

[0042] The underwater acoustic communication device is fixed in the cavity structure of the protection shell 20 outside the subsurface buoy subsystem protection shell 20, and the electric signal is connected with the power supply 21 and the high-performance signal processor inside the protection shell 20 through the water-tight cable and the water-tight connector. The key information of the subsurface buoy subsystem needs to be transmitted at low speed and long distance, including processing information feedback, response release, etc., to ensure that the subsurface buoy is in normal working state and can be recovered. The ship-borne acoustic positioning communication deck unit and the underwater acoustic communication device perform positioning communication through encryption coding, ensuring reliable data transmission.

[0043] To ensure that the subsurface buoy subsystem is in normal working state, the ship is regularly driven to the deployment area for inspection, and the water-light communication and underwater acoustic communication need the assistance of the ship. They cannot be used for alarm information transmission, and VHF is specially used for alarm information communication. After the subsurface buoy subsystem detects and analyzes the target in the water, the VHF beacon is released, and the VHF beacon transmits the alarm signal to the shore-based subsystem. The radio frequency receiving module of the shore-based subsystem receives the alarm signal, which is displayed in the data display module and stored. The control module of the shore-based subsystem reports and alarms the alarm signal.

[0044] Specifically, please refer to the accompanying drawings Figure 3 、 4 and 5, the buffer mechanism 33 includes a magneto-rheological elastomer vibration isolator 331 installed on the outer surface of the protection shell 20 from top to bottom, and a spring shock absorber 332 arranged between the two magneto-rheological elastomer vibration isolators 331, the spring shock absorber 332 is installed on the outer surface of the protection shell 20, the spring shock absorber 332 and the magneto-rheological elastomer vibration isolator 331 are connected with the side surface of the protection shell 20 close to the corresponding folding compression plate 322, the sliding mechanism 31 includes a support ring 311 sleeved on the outer surface of the protection shell 20, a plurality of guide rails 312 installed on the outer surface of the support ring 311, and a pulley 313 arranged inside the guide rail 312 and connected with the inner wall of the guide rail 312, the pulley 313 is connected with the same side arc-shaped compression plate 321 through a rotating shaft;

[0045] It should be noted that in this embodiment, when the arc-shaped compression plate 321 is impacted by the water flow, the arc-shaped compression plate 321 stores energy through the magneto-rheological elastomer vibration isolator 331 and the spring shock absorber 332, thereby prolonging the time of impact force transmission to the protection shell 20, and reducing the impact of the water flow on the protection shell 20;

[0046] Further, when the arc-shaped compression-resisting plate 321 is displaced by the impact of water flow, the arc-shaped compression-resisting plate 321 slides on the guide rail 312 through the pulley 313 rotatably connected thereto, thereby providing a guide for the displacement of the arc-shaped compression-resisting plate 321, so that the magneto-rheological elastomer damper 331 and the spring damper 332 provide buffering for the arc-shaped compression-resisting plate 321, and the guide rail 312 is supported by the support ring 311, and the arc-shaped compression-resisting plate 321 is supported by the guide rail 312.

[0047] Specifically, please refer to the accompanying drawings Figure 4 and 5 The top end of the pulley 313 is provided with a displacement sensor 314, the inner wall of the protective shell 20 is provided with a plurality of first excitation coils 23 at the top end, and is provided with a plurality of second excitation coils 24 at the bottom end, and the first excitation coils 23 and the second excitation coils 24 are arranged around the axis of the protective shell 20;

[0048] It should be noted that in this embodiment, when the arc-shaped compression-resisting plate 321 moves the pulley 313, the displacement of the arc-shaped compression-resisting plate 321 is monitored by the displacement sensor 314 of model LIS3DSHTR, and an electric signal with displacement information is obtained, and the displacement sensor 314 electrically connected to the PLC controller receives the electric signal with displacement information transmitted by the displacement sensor 314, so as to determine whether the displacement of the arc-shaped compression-resisting plate 321 exceeds the set value stored therein by the PLC controller;

[0049] Further, the magnetic effect of the magneto-rheological elastomer damper 331 arranged in line with the first excitation coil 23 is changed by the first excitation coil 23, and the magnetic effect of the magneto-rheological elastomer damper 331 arranged in line with the second excitation coil 24 is changed by the second excitation coil 24, thereby adjusting the local stiffness of the magneto-rheological elastomer damper 331 and changing the damping effect, and after the displacement of the arc-shaped compression-resisting plate 321 exceeds the set value stored therein by the PLC controller, the current through the first excitation coil 23 and the second excitation coil 24 is controlled, thereby changing the damping effect of the magneto-rheological elastomer damper 331, so that the magneto-rheological elastomer damper 331 can adapt to changes in the environment.

[0050] Specifically, please refer to the accompanying drawings Figure 3 and 5, two adjacent folding compression plates 322 are provided with a noise reduction plate 323 between the side surface of the protective shell 20 and the outer surface of the noise reduction shell 41, two ends of the noise reduction plate 323 are connected with the two folding compression plates 322 respectively, the noise reduction plate 323 is arc-shaped, the material of the noise reduction plate 323 is EPDM rubber, the noise reduction mechanism 43 comprises a noise reduction layer 431 provided between the detection identifier 42 and the inner wall surface of the noise reduction shell 41, and an active noise reducer 432 penetrating through the noise reduction layer 431 and installed on the inner wall surface of the noise reduction shell 41, the material of the noise reduction layer 431 is high-molecular polyurethane material, the thickness of the noise reduction layer 431 is 20-30mm, the inside bottom end of the protective shell 20 is provided with a power supply 21, and the upper surface of the power supply 21 is provided with an identification machine 22;

[0051] It should be noted that, in the embodiment, when the folding compression plate 322 is displaced by the water flow, the noise reduction plate 323 is driven by the folding compression plate 322 to approach the detection identifier 42, so that the detection identifier 42 is subjected to noise reduction treatment by the noise reduction plate 323;

[0052] Further, the noise reduction layer 431 provides the detection identifier 42 with a noise reduction function, when the displacement of the arc-shaped compression plate 321 exceeds the set value stored therein, the PLC controller starts the active noise reducer 432 in the detection identifier 42 in the same direction as the arc-shaped compression plate 321, so as to further strengthen the active noise reducer 432.

[0053] The specific operation mode of the application is as follows:

[0054] When the arc-shaped compression plate 321 is impacted by the water flow, the arc-shaped compression plate 321 stores energy through the magneto-rheological elastomer vibration isolator 331 and the spring shock absorber 332, thereby prolonging the time of impact force transmission to the protection shell 20, and reducing the impact of the water flow on the protection shell 20. When the arc-shaped compression plate 321 drives the pulley 313 to move, the displacement of the arc-shaped compression plate 321 is monitored by the displacement sensor 314 of the LIS3DSHTR type, and an electrical signal with displacement information is obtained. The displacement sensor 314 electrically connected to the PLC controller receives the electrical signal with displacement information transmitted by the displacement sensor 314, so as to determine whether the displacement of the arc-shaped compression plate 321 exceeds the set value stored therein through the PLC controller. The magnetic effect of the magneto-rheological elastomer vibration isolator 331 arranged in the same line with the first excitation coil 23 is changed by the first excitation coil 23, and the magnetic effect of the magneto-rheological elastomer vibration isolator 331 arranged in the same line with the second excitation coil 24 is changed by the second excitation coil 24, so as to adjust the local stiffness of the magneto-rheological elastomer vibration isolator 331 and change the damping effect. When the displacement of the arc-shaped compression plate 321 exceeds the set value stored therein, the damping effect of the magneto-rheological elastomer vibration isolator 331 is changed by controlling the current through the first excitation coil 23 and the second excitation coil 24, so that the magneto-rheological elastomer vibration isolator 331 can adapt to the change of the environment.

[0055] When the folding compression plate 322 is displaced by the influence of the water flow, the noise reduction plate 323 is driven by the folding compression plate 322 to approach the detection identifier 42, so as to perform noise reduction processing on the detection identifier 42 by the noise reduction plate 323, and the detection identifier 42 is provided with a noise reduction function by the noise reduction layer 431. When the displacement of the arc-shaped compression plate 321 exceeds the set value stored therein, the active noise reducer 432 in the detection identifier 42 in the same direction as the arc-shaped compression plate 321 is turned on, so as to further strengthen the active noise reducer 432.

[0056] The above describes the present application by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present application is not limited to the above manner, and any non-essential improvement or direct application of the inventive concept and technical solution to other occasions is within the scope of protection of the present application.

Claims

1. An underwater target detection and identification device, comprising a chassis (10), characterized in that, A protective shell (20) is installed on the upper surface of the chassis (10), and an anti-pressure noise reduction component (30) is provided on the outside of the protective shell (20). A detection and identification component (40) is provided between the anti-pressure noise reduction component (30) and the protective shell (20). The top of the inner wall of the protective shell (20) is equipped with a plurality of first excitation coils (23) and the bottom of the inner wall is equipped with a plurality of second excitation coils (24). The plurality of first excitation coils (23) and the second excitation coils (24) are arranged around the axis of the protective shell (20). The pressure-resistant noise reduction component (30) includes a sliding mechanism (31) installed at the upper and lower ends of the protective shell (20), a pressure-resistant mechanism (32) disposed between the two sliding mechanisms (31), and a plurality of buffer mechanisms (33) disposed between the pressure-resistant mechanism (32) and the protective shell (20), wherein the plurality of buffer mechanisms (33) are arranged around the axis of the protective shell (20); The anti-compression mechanism (32) includes an arc-shaped anti-compression plate (321) connected to the execution end of the buffer mechanism (33), and a folded anti-compression plate (322) rotatably connected to both ends of the arc-shaped anti-compression plate (321), with adjacent folded anti-compression plates (322) rotatably connected. The buffer mechanism (33) includes magnetorheological elastomer vibration isolators (331) installed sequentially from top to bottom on the outer surface of the protective shell (20), and spring dampers (332) disposed between the two magnetorheological elastomer vibration isolators (331). The spring dampers (332) are installed on the outer surface of the protective shell (20), and both the spring dampers (332) and the magnetorheological elastomer vibration isolators (331) are connected to the side surface of the folded anti-compression plate (322) near the protective shell (20). The detection and identification component (40) includes a noise reduction shell (41) installed on the upper surface of the chassis (10), a detection and identification device (42) installed inside the noise reduction shell (41), and a noise reduction mechanism (43) disposed between the inner wall of the noise reduction shell (41) and the outer surface of the detection and identification device (42).

2. The underwater target detection and identification device according to claim 1, characterized in that, The sliding mechanism (31) includes a support ring (311) sleeved on the outer surface of the protective shell (20), a plurality of guide rails (312) installed on the outer surface of the support ring (311), and a pulley (313) disposed inside the guide rail (312) and slidably connected to the inner wall of the guide rail (312). The pulley (313) is rotatably connected to the arc-shaped pressure plate (321) on the same side through a rotating shaft.

3. The underwater target detection and identification device according to claim 2, characterized in that, A displacement sensor (314) is installed on the top of the pulley (313).

4. The underwater target detection and identification device according to claim 1, characterized in that, A noise reduction plate (323) is provided between the side surface of the two adjacent folded pressure-resistant plates (322) near the protective shell (20) and the outer surface of the noise reduction shell (41), and the two ends of the noise reduction plate (323) are respectively connected to the two folded pressure-resistant plates (322).

5. The underwater target detection and identification device according to claim 4, characterized in that, The noise reduction plate (323) is arc-shaped and is made of EPDM rubber.

6. The underwater target detection and identification device according to claim 1, characterized in that, The noise reduction mechanism (43) includes a noise reduction layer (431) disposed between the detector (42) and the inner wall surface of the noise reduction shell (41), and an active noise reducer (432) that penetrates the shell of the noise reduction layer (431) and is installed on the inner wall surface of the noise reduction shell (41).

7. The underwater target detection and identification device according to claim 6, characterized in that, The noise reduction layer (431) is made of high molecular polyurethane material, and the thickness of the noise reduction layer (431) is 20mm to 30mm.

8. The underwater target detection and identification device according to claim 1, characterized in that, A power supply (21) is installed at the bottom of the inner part of the protective shell (20), and an identification device (22) is installed on the upper surface of the power supply (21).

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