Ship sonar assembly structure and sonar assembly method

Abstract

The application relates to the technical field of ship body structures, and discloses a ship sonar assembly structure and a sonar assembly method. The ship sonar assembly structure comprises a ship body, a protective cover, a transition plate and a sonar device. The protective cover comprises a shell and an assembly plate. The shell has an assembly cavity. The sonar device is arranged in the assembly cavity and is fixedly connected with the assembly plate. The shell has a front end and a rear end. The front end of the shell faces the bow of the ship body. The transition plate is connected between the front end of the shell and the ship body. The transition plate is a circumferentially closed structure. The inner diameter of the transition plate gradually increases in the direction from the shell to the ship body. Since the front end of the shell is connected with the ship body through the transition plate, the front end of the sonar device can extend out of the protective cover and be immersed in water without exceeding the transition plate. Therefore, the sonar device does not exceed the ship body, and the sonar device is effectively protected. Moreover, the internal profile of the transition plate matches the sound wave propagation profile of the sonar device, the detection angle requirement of the sonar device is met, and the detection range of the sonar device is effectively ensured.

Description

Technical Field

[0001] This invention relates to the field of ship structure technology, and in particular to a ship sonar assembly structure and sonar assembly method. Background Technology

[0002] When ships navigate, they encounter numerous potential hazards and obstacles, such as shoals, reefs, islands, and floating containers. To improve navigation safety, large ships are equipped with collision avoidance sonar for real-time information processing and timely navigation. Collision avoidance sonar is generally installed in the underwater section of the bow, located on the centerline, with the sonar head extending beyond the ship, penetrating the water, and facing directly ahead of the ship.

[0003] When a ship is sailing, a large current flows past the sonar at the bow. Under certain conditions, this current can damage the sonar and shorten its lifespan. To protect the sonar equipment and provide a good detection environment, sonar protection devices must be developed to ensure its safe and effective operation. Existing ships are equipped with fairings to change the direction of the water flow at the bow. However, while changing the water flow, the fairings also affect the sonar's sound wave transmission range, thus impacting its operation. Summary of the Invention

[0004] The purpose of this invention is to provide a shipborne sonar assembly structure to solve the problem that the fairing in the prior art affects the sound wave transmission range of the sonar; this invention also provides a sonar assembly method.

[0005] To achieve the above objectives, the present invention provides a ship sonar assembly structure, including a hull, a protective cover, a transition plate, and a sonar device. The protective cover includes an outer shell and an assembly plate fixedly connected to the outer shell. The outer shell has an assembly cavity, and the assembly plate is disposed in the assembly cavity and welded to the outer shell. The sonar device is disposed in the assembly cavity and fixedly connected to the assembly plate. The outer shell has a front end and a rear end, with the front end of the outer shell facing the bow of the hull. The transition plate connects the front end of the outer shell and the hull. The transition plate is a circumferentially closed structure, and the inner diameter of the transition plate gradually increases along the direction from the outer shell to the hull.

[0006] Preferably, the outer casing includes a front casing, a rear casing, and an end plate. The front casing is welded and fixed to the rear casing, the assembly plate is welded and fixed to the front casing, the front end of the front casing is smoothly connected to the transition plate, and the end plate is welded and fixed to the rear end of the rear casing.

[0007] Preferably, the front housing includes a first shell plate and a second shell plate, and the rear housing includes a third shell plate and a fourth shell plate. The first shell plate, the second shell plate, the third shell plate, and the fourth shell plate are all U-shaped structures. The first shell plate and the second shell plate are arranged opposite to each other and welded together. The third shell plate and the fourth shell plate are arranged opposite to each other and welded together.

[0008] Preferably, the assembly plate includes a first plate and a second plate, which are arranged opposite each other in a direction perpendicular to the hull. Both the first plate and the second plate are provided with at least two assembly holes for bolts to be inserted. The sonar device is connected to the first plate and the second plate by bolts.

[0009] Preferably, the sonar device includes a probe, a transducer, and a watertight cable. The probe is located at the front end of the transducer, the watertight cable is electrically connected to the transducer, and a connecting plate is provided at the connection position between the probe and the transducer. The connecting plate is provided with multiple bolt holes, and the connecting plate is bolted to the first plate and to the second plate.

[0010] Preferably, the transition plate is trumpet-shaped, and there is a smooth transition between the transition plate and the hull, and between the transition plate and the outer shell.

[0011] The present invention also provides a sonar assembly method for the shipborne sonar assembly structure described in any of the above technical solutions, comprising the following steps:

[0012] S1. Using positioning fixtures, the front shell and the rear shell are positioned and manufactured respectively. The rear shell is welded and fixed to the end plate. Then, using positioning fixtures, the assembly plate is welded and fixed to the front shell. The protective cover is assembled and the outer shell of the protective cover is welded and fixed to the hull.

[0013] S2, weld and fix the front end of the outer shell of the protective cover to the transition plate, and then weld and fix the transition plate to the hull.

[0014] S3, Place the sonar equipment into the assembly cavity of the housing and bolt the sonar equipment to the assembly plate.

[0015] Preferably, in step S1, the positioning fixture includes a positioning plate, a partition plate, and a baffle plate. The partition plate and the baffle plate are located on the same side of the positioning plate. The positioning plate, the partition plate, and the baffle plate are vertically welded and fixed in pairs. The positioning plate is provided with positioning holes, which correspond to the assembly holes of the assembly plate in the front-rear direction. The outer contour of the positioning plate corresponds to the inner contour of the front housing.

[0016] In step S1, when making the front shell, the inner walls of the first shell plate and the second shell plate are brought into contact with the positioning plate. When making the rear shell, the inner walls of the third shell plate and the fourth shell plate are brought into contact with the positioning plate. When welding the assembly plate to the front shell, the assembly plate and the positioning plate are attached and fixed with bolts to position the assembly plate. The assembly plate is then welded to the front shell.

[0017] Compared with the prior art, the ship sonar assembly structure and method of this invention have the following advantages: A protective cover and a transition plate are welded onto the hull. Since the front end of the outer shell is connected to the hull via the transition plate, the sonar equipment is located inside the assembly cavity of the protective cover and fixedly connected to the assembly plate. The front end of the sonar equipment can extend out of the protective cover and be submerged in water without exceeding the transition plate. Therefore, the sonar equipment will not extend beyond the hull, effectively protecting it. Furthermore, the inner diameter of the transition plate gradually increases along the direction from the outer shell to the hull, and the internal contour of the transition plate matches the sound wave propagation contour of the sonar equipment, meeting the detection angle requirements of the sonar equipment and effectively ensuring its detection range. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the ship sonar assembly structure of the present invention;

[0019] Figure 2 yes Figure 1 A cross-sectional view of the ship's sonar assembly structure along the MM line;

[0020] Figure 3 yes Figure 1 Right view of the ship's sonar assembly structure;

[0021] Figure 4 This is a schematic diagram of the protective cover of the ship sonar assembly structure of the present invention;

[0022] Figure 5 yes Figure 4 A cross-sectional view of the protective cover along line AA;

[0023] Figure 6 yes Figure 4 A cross-sectional view of the protective cover along line BB;

[0024] Figure 7 This is a schematic diagram of the positioning tooling for the ship sonar assembly structure of the present invention;

[0025] Figure 8 This is a schematic diagram showing the cooperation between the protective cover and the positioning fixture of the ship sonar assembly structure of the present invention;

[0026] Figure 9 This is a schematic diagram of the sonar equipment in the ship sonar assembly structure of the present invention.

[0027] In the diagram, 1. Hull, 2. Transition plate, 3. Protective cover, 31. Outer shell, 311. Front hull, 3111. First shell plate, 3112. Second shell plate, 312. Rear hull, 3121. Third shell plate, 3122. Fourth shell plate, 313. End plate, 32. Assembly plate, 321. First plate, 322. Second plate, 323. Assembly hole, 33. Assembly cavity, 4. Sonar equipment, 41. Detector head, 42. Transducer, 43. Watertight cable, 44. Connecting plate, 5. Positioning fixture, 51. Positioning plate, 511. Positioning hole, 52. Partition, 53. Baffle. Detailed Implementation

[0028] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0029] A preferred embodiment of the ship sonar assembly structure of the present invention, such as... Figures 1 to 9 As shown, the ship sonar assembly structure includes a hull 1, a protective cover 3, a transition plate 2, and a sonar device 4. The protective cover 3 is used to protect the sonar device 4, and the transition plate 2 is used to connect the protective cover 3 to the hull 1. When welding the protective cover 3, the hull 1, and the transition plate 2, all welds must be watertight to ensure the protective effect on the sonar device 4.

[0030] The protective cover 3 includes an outer shell 31 and an assembly plate 32. The outer shell 31 is integrally embedded within the hull 1, and the assembly plate 32 is welded and fixed to the outer shell 31. The outer shell 31 has a cylindrical structure and an assembly cavity 33. The assembly plate 32 is located within the assembly cavity 33 and is welded and fixed to the outer shell 31. The sonar device 4 is located in the assembly cavity 33 and fixedly connected to the assembly plate 32. That is, the assembly plate 32 is used to fix the sonar device 4, and the sonar device 4 is assembled in the assembly cavity 33 of the outer shell 31 along the front-to-back direction.

[0031] The outer casing 31 has a front end and a rear end. The front end of the outer casing 31 faces the bow of the hull 1, and the rear end of the outer casing 31 faces the stern of the hull 1. That is, the forward and backward directions of the protective cover 3 and the transition plate 2 are the same as the forward and backward directions of the hull 1. The front end of the outer casing 31 is welded and fixed to the transition plate 2, and the front end of the transition plate 2 is welded and fixed to the hull 1, so that the transition plate 2 connects the outer casing 31 and the hull 1. After the sonar device 4 is installed in the assembly cavity 33 of the outer casing 31, the front end of the sonar device 4 extends out of the outer casing 31 and is located within the transition plate 2. At the same time, the sonar device 4 does not extend beyond the hull 1, effectively protecting the sonar device 4.

[0032] The transition plate 2 is a circumferentially closed structure, where circumferential refers to the direction around the centerline in the forward and backward direction. The inner diameter of the transition plate 2 gradually increases along the direction from the outer shell 31 to the hull 1, making the transition plate 2 an open structure. The angle of the transition plate 2 meets the detection angle requirements of the sonar device 4. When the sonar device 4 is working, the direction of sound wave propagation matches the contour of the transition plate 2, effectively ensuring the detection range of the sonar device 4.

[0033] The ship's sonar assembly structure has a protective cover 3 and a transition plate 2 welded onto the hull 1. Since the front end of the outer shell 31 is connected to the hull 1 through the transition plate 2, after the sonar device 4 is located in the assembly cavity 33 of the protective cover 3 and fixedly connected to the assembly plate 32, the front end of the sonar device 4 can extend out of the protective cover 3 and be submerged in water without exceeding the transition plate 2. Therefore, the sonar device 4 will not exceed the hull 1, effectively protecting the sonar device 4. Furthermore, the inner diameter of the transition plate 2 gradually increases along the direction from the outer shell 31 to the hull 1, and the internal contour of the transition plate 2 matches the sound wave propagation contour of the sonar device 4, meeting the detection angle requirements of the sonar device 4 and effectively ensuring the detection range of the sonar device 4.

[0034] Preferably, the outer shell 31 includes a front shell 311, a rear shell 312 and an end plate 313. The front shell 311 is welded and fixed to the rear shell 312, the assembly plate 32 is welded and fixed to the front shell 311, the front end of the front shell 311 is smoothly connected to the transition plate 2, and the end plate 313 is welded and fixed to the rear end of the rear shell 312.

[0035] The outer casing 31 consists of a front casing 311, a rear casing 312, and an end plate 313. The front casing 311 and the rear casing 312 are welded together. During manufacturing, the front casing 311 and the rear casing 312 can be fabricated separately. Then, the assembly plate 32 is welded to the front casing 311, and the end plate 313 is welded to the rear casing 312. After the assembly plate 32 and the end plate 313 are welded together, the front casing 311 and the rear casing 312 are welded together in the front-rear direction. This facilitates the assembly of the end plate 313 and the assembly plate 32 and also effectively controls the precision of welding the assembly plate 32 to the front casing. In this embodiment, the end plate 313 has a central hole for the watertight cable 43 of the sonar device 4 to pass through.

[0036] Preferably, the front housing 311 includes a first housing plate 3111 and a second housing plate 3112, and the rear housing 312 includes a third housing plate 3121 and a fourth housing plate 3122. The first housing plate 3111, the second housing plate 3112, the third housing plate 3121 and the fourth housing plate 3122 are all U-shaped structures. The first housing plate 3111 and the second housing plate 3112 are arranged opposite to each other and welded together. The third housing plate 3121 and the fourth housing plate 3122 are arranged opposite to each other and welded together.

[0037] The front shell 311 is formed by welding and fixing the U-shaped first shell plate 3111 and the second shell plate 3112. The rear shell 312 is formed by welding and fixing the U-shaped third shell plate 3121 and the fourth shell plate 3122. The first shell plate 3111, the second shell plate 3112, the third shell plate 3121 and the fourth shell plate 3122 can be manufactured separately. After being formed, they are assembled using the positioning fixture 5, which helps to control the manufacturing accuracy of the first shell plate 3111, the second shell plate 3112, the third shell plate 3121 and the fourth shell plate 3122.

[0038] In this embodiment, the first shell plate 3111, the second shell plate 3112, the third shell plate 3121, and the fourth shell plate 3122 are all U-shaped structures. There are only two welds between the first shell plate 3111 and the second shell plate 3112, and only two welds between the third shell plate 3121 and the fourth shell plate 3122. Reducing the number of welds helps to increase the strength of the shell and the manufacturing precision. Since the front and rear dimensions of the outer shell 31 are consistent, and the first shell plate 3111, the second shell plate 3112, the third shell plate 3121, and the fourth shell plate 3122 have the same specifications, they can be interchanged, simplifying the manufacturing process and the structure of the protective cover 3. This makes the protective cover 3 simple to manufacture, easy to operate, versatile, and highly reliable.

[0039] Preferably, the assembly plate 32 includes a first plate 321 and a second plate 322. The first plate 321 and the second plate 322 are arranged opposite each other in a direction perpendicular to the front and rear of the hull 1. The first plate 321 and the second plate 322 are each provided with at least two assembly holes 323 for bolts to be inserted. The sonar device 4 is connected to the first plate 321 and the second plate 322 by bolts.

[0040] The mounting plate 32 is formed by the first plate 321 and the second plate 322 being arranged opposite to each other. The gap between the first plate 321 and the second plate 322 can be used to accommodate the sonar device 4. The first plate 321 and the second plate 322 are provided with mounting holes 323 and are bolted to the sonar device 4. After the protective cover 3 is made, it can be fixed to the mounting plate 32, which also facilitates the disassembly and maintenance of the sonar device 4 in the later stage.

[0041] Preferably, the sonar device 4 includes a probe 41, a transducer 42, and a watertight cable 43. The probe 41 is located at the front end of the transducer 42, and the watertight cable 43 is electrically connected to the transducer 42. A connecting plate 44 is provided at the connection position between the probe 41 and the transducer 42. The connecting plate 44 is provided with multiple bolt holes, and the connecting plate 44 is bolted to the first plate 321 and to the second plate 322.

[0042] The sonar device 4 consists of a probe head 41, a transducer 42, and a watertight cable 43. After the connecting plate 44 is bolted to the first plate 321 and the second plate 322, the probe head 41 is located at the front end of the mounting plate 32. Therefore, the probe head 41 extends into the transition plate 2, but one side of the head will not extend beyond the hull 1. The transition plate 2 and the protective cover 3 protect the probe head 41. The transducer 42 is located at the rear end of the mounting plate 32. After the connecting plate 44 is connected to the first plate 321 and the second plate 322, a seal is formed. The transducer 42 is located in the assembly cavity 33 of the protective cover 3. The assembly cavity 33 is a watertight space, which protects the transducer 42.

[0043] Preferably, the transition plate 2 is trumpet-shaped, and there is a smooth transition between the transition plate 2 and the hull 1, and between the transition plate 2 and the outer shell 31.

[0044] The transition plate 2 has a horn-shaped structure, which makes the inner contour of the transition plate 2 curved, ensuring a smooth connection between the transition plate 2 and the hull 1, and between the transition plate 2 and the outer shell 31, reducing stress, and also protecting the sonar equipment 4 inside.

[0045] The present invention also provides a preferred embodiment of a sonar assembly method, which includes the following steps:

[0046] S1, using positioning fixture 5 to position and manufacture the front shell 311 and the rear shell 312 respectively, welding and fixing the rear shell 312 to the end plate 313, then using positioning fixture 5 to weld and fix the assembly plate 32 to the front shell 311, assembling the protective cover 3, and welding and fixing the outer shell 31 of the protective cover 3 to the hull 1.

[0047] S2, weld and fix the front end of the outer shell 31 of the protective cover 3 to the transition plate 2, and then weld and fix the transition plate 2 to the hull 1.

[0048] S3, sonar device 4 is placed into assembly cavity 33 of housing 31, and sonar device 4 is bolted to assembly plate 32.

[0049] In step S1, the positioning fixture 5 is used to fabricate the front shell 311, the rear shell 312, and weld and fix the assembly plate 32 to the front shell 311, ensuring the individual fabrication accuracy of the assembly plate 32, the front shell 311, and the rear shell 312, as well as their assembly accuracy. In fabricating the shell 31 and the assembly plate 32, the following parts are first fabricated: the first shell plate 3111, the second shell plate 3112, the third shell plate 3121, the fourth shell plate 3122, the first plate body 321, the second plate body 322, and the end plate 313. Assembly holes 323 are machined into the first plate body 321 and the second plate body 322. After each part is machined, its accuracy is checked to ensure the precision of the protective cover 3.

[0050] In step S2, when welding the fixed transition plate 2, protective cover 3 and hull 1, ensure that all welds are watertight to avoid water leakage that could damage the sonar equipment 4.

[0051] Preferably, in step S1, the positioning fixture 5 includes a positioning plate 51, a partition plate 52, and a baffle plate 53. The partition plate 52 and the baffle plate 53 are located on the same side of the positioning plate 51. The positioning plate 51, the partition plate 52, and the baffle plate 53 are vertically welded together in pairs. The positioning plate 51 is provided with a positioning hole 511, which corresponds to the assembly hole 323 of the assembly plate 32 in the front-rear direction. The outer contour of the positioning plate 51 corresponds to the inner contour of the front housing 311. When manufacturing the front housing 311, the inner walls of the first housing plate 3111 and the second housing plate 3112 are brought into contact with the positioning plate 51. When manufacturing the rear housing 312, the inner walls of the third housing plate and the fourth housing plate 3122 are brought into contact with the positioning plate 51. When welding the assembly plate 32 to the front housing 311, the assembly plate 32 and the positioning plate 51 are attached and fixed with bolts to position the assembly plate 32. The assembly plate 32 and the front housing 311 are then welded and fixed.

[0052] In step S1, the positioning plate 51, partition plate 52 and baffle plate 53 are first cut out and then welded together to form the positioning fixture 5, so that the outer contour of the positioning plate 51 corresponds to the inner contour of the front shell 311. When the inner walls of the first shell plate 3111 and the second shell plate 3112 are in contact with the positioning plate 51, the positioning plate 51 can be used to position the relative positions of the first shell plate 3111, the second shell plate 3112, the third shell plate 3121 and the fourth shell plate 3122, ensuring the manufacturing accuracy of the welded shell 31, so as to effectively protect the sonar equipment 4 and ensure that the sonar equipment 4 has a good working environment.

[0053] The positioning hole 511 on the positioning plate 51 corresponds to the position of the assembly plate 32 on the assembly plate 32. When welding the assembly plate 32, the bolt passes through the positioning hole 511 and the assembly hole 323 to fix the assembly plate 32 and the positioning plate 51. The positioning plate 51 is used to position the assembly plate 32, which can ensure that the first plate 321 and the second plate 322 of the assembly plate 32 are in the same position in the front and rear directions and are perpendicular to the front housing 311. It also ensures the installation accuracy of the subsequent sonar equipment 4, effectively ensuring that the sound wave detection angle of the sonar equipment 4 matches the angle of the transition plate 2, and meets the detection angle requirements of the sonar equipment 4.

[0054] In summary, the embodiments of the present invention provide a ship sonar assembly structure and a sonar assembly method. A protective cover and a transition plate are welded onto the hull. Since the front end of the outer shell is connected to the hull via the transition plate, and the sonar equipment is located within the assembly cavity of the protective cover and fixedly connected to the assembly plate, the front end of the sonar equipment can extend out of the protective cover and be submerged in water without exceeding the transition plate. Therefore, the sonar equipment will not extend beyond the hull, effectively protecting it. Furthermore, the inner diameter of the transition plate gradually increases along the direction from the outer shell to the hull, and the internal contour of the transition plate matches the sound wave propagation contour of the sonar equipment, meeting the detection angle requirements of the sonar equipment and effectively ensuring its detection range.

[0055] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A shipborne sonar assembly structure, characterized in that, The system includes a hull (1), a protective cover (3), a transition plate (2), and a sonar device (4). The protective cover (3) includes an outer shell (31) and an assembly plate (32) fixedly connected to the outer shell (31). The outer shell (31) has an assembly cavity (33). The assembly plate (32) is located in the assembly cavity (33) and welded to the outer shell (31). The sonar device (4) is located in the assembly cavity (33) and fixedly connected to the assembly plate (32). The outer shell (31) has a front end and a rear end. The front end of the outer shell (31) faces the bow of the hull (1). The transition plate (2) connects the front end of the outer shell (31) to the hull (1). The transition plate (2) is a circumferentially closed structure. The inner diameter of the transition plate (2) gradually increases along the direction from the outer shell (31) to the hull (1). The front end of the sonar device extends out of the protective cover (3) and is submerged in water, but does not exceed the transition plate (2). The outer shell (31) includes a front shell (311), a rear shell (312), and an end plate (313). The front shell (311) is welded and fixed to the rear shell (312). The assembly plate (32) is welded and fixed to the front shell (311). The front end of the front shell (311) is smoothly connected to the transition plate (2). The end plate (313) is welded and fixed to the rear end of the rear shell (312). The assembly plate (32) includes a first plate body (321) and a second plate body (322). The first plate body (321) and the second plate body (322) are arranged opposite each other in a direction perpendicular to the front and rear of the hull (1). The first plate body (321) and the second plate body (322) are each provided with at least two assembly holes (323). The assembly holes (323) are used to insert bolts. The sonar device (4) is connected to the first plate body (321) and the second plate body (322) by bolts.

2. The shipborne sonar assembly structure according to claim 1, characterized in that, The front housing (311) includes a first shell plate (3111) and a second shell plate (3112), and the rear housing (312) includes a third shell plate (3121) and a fourth shell plate (3122). The first shell plate (3111), the second shell plate (3112), the third shell plate (3121) and the fourth shell plate (3122) are all U-shaped structures. The first shell plate (3111) and the second shell plate (3112) are arranged opposite to each other and welded together. The third shell plate (3121) and the fourth shell plate (3122) are arranged opposite to each other and welded together.

3. The shipborne sonar assembly structure according to claim 1, characterized in that, The sonar device (4) includes a probe (41), a transducer (42), and a watertight cable (43). The probe (41) is located at the front end of the transducer (42). The watertight cable (43) is electrically connected to the transducer (42). A connecting plate (44) is provided at the connection position between the probe (41) and the transducer (42). The connecting plate (44) is provided with multiple bolt holes. The connecting plate (44) is bolted to the first plate (321) and to the second plate (322).

4. The shipborne sonar assembly structure according to any one of claims 1-3, characterized in that, The transition plate (2) is trumpet-shaped, and there is a smooth transition between the transition plate (2) and the hull (1) and between the transition plate (2) and the outer shell (31).

5. A sonar assembly method, used in the shipborne sonar assembly structure according to any one of claims 1-4, characterized in that, Includes the following steps: S1, using positioning fixture (5) to position and manufacture the front shell (311) and the rear shell (312) respectively, weld the rear shell (312) to the end plate (313) and then use positioning fixture (5) to weld the assembly plate (32) to the front shell (311) and assemble the protective cover (3), and weld the outer shell (31) of the protective cover (3) to the hull (1). S2, weld the front end of the outer shell (31) of the protective cover (3) to the transition plate (2) and then weld the transition plate (2) to the hull (1). S3, place the sonar device (4) into the assembly cavity (33) of the outer shell (31) and bolt the sonar device (4) to the assembly plate (32).

6. The sonar assembly method according to claim 5, characterized in that, In step S1, the positioning fixture (5) includes a positioning plate (51), a partition plate (52), and a baffle plate (53). The partition plate (52) and the baffle plate (53) are located on the same side of the positioning plate (51). The positioning plate (51), the partition plate (52), and the baffle plate (53) are vertically welded and fixed in pairs. The positioning plate (51) is provided with a positioning hole (511). The positioning hole (511) corresponds to the assembly hole (323) of the assembly plate (32) in the front-back direction. The outer contour of the positioning plate (51) corresponds to the inner contour of the front housing (311). In step S1, when making the front shell (311), the inner wall of the first shell plate (3111) and the inner wall of the second shell plate (3112) are brought into contact with the positioning plate (51). When making the rear shell (312), the inner wall of the third shell plate and the inner wall of the fourth shell plate (3122) are brought into contact with the positioning plate (51). When welding the assembly plate (32) to the front shell (311), the assembly plate (32) and the positioning plate (51) are attached and fixed with bolts to position the assembly plate (32). The assembly plate (32) and the front shell (311) are then welded and fixed.

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