Connecting structure of ship body and full-rotation steering oar

Abstract

The utility model discloses a connecting structure of a hull and a steering oar, the steering oar comprises a trunk, a trunk large flange is fixed at the top of the trunk, and a first connecting plate is sleeved and fixed at the bottom of the trunk; a mounting hole used for bearing a trunk is formed in the ship body, an annular second connecting plate is fixed to the top of the ship body, an annular third connecting plate is fixed to the bottom of the ship body, and the mounting hole, an inner hole of the second connecting plate and an inner hole of the third connecting plate are coaxially arranged; the trunk large flange is inserted into an inner hole of the second connecting plate and is fixedly connected with the second connecting plate; the first connecting plate is inserted into an inner hole of the third connecting plate, and the first connecting plate and the third connecting plate are fixedly connected. According to the structure, the ship body can be provided with the window only matched with the trunk of the steering oar, and then the ship body and the steering oar can be assembled, so that the connecting strength of the steering oar and the ship body can be effectively improved, and the overall rigidity is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of ship assembly, and in particular to a connection structure between a hull and a fully azimuth propeller. Background Technology

[0002] A 360-degree azimuth propeller is a type of propeller that can control the propeller's rotation. Its thrust direction and magnitude are controllable, making the reliability of its connection to the hull crucial. Currently, the most common installation methods are superstructure and understructure. Superstructure installation involves hoisting the entire azimuth propeller into the hull from top to bottom and securing it with bolts. Its main support relies on the cofferdam and bolts. Due to the large volume of the duct, superstructure installation requires a large window in the top of the propeller compartment for installation, resulting in a very large cofferdam supporting the propeller, which is detrimental to the overall rigidity of the propeller and prone to vibration and deformation. Understructure installation involves hoisting the entire azimuth propeller into the hull from bottom to top and securing it with bolts. It primarily relies on bolts to bear the propeller force. This installation method is often limited by the space under the stern. Due to the weight of the entire propeller, installation is more complex and prone to damaging the upper parts of the propeller.

[0003] The prior art disclosed in the announcement number CN108298017B is a well-type vibration damping installation method for a steering device, including the following steps: Step 1: Installing the well box base (1) Opening the well: Opening a well on the hull to the bottom of the hull for the rudder propeller to extend out of the hull; (2) Welding the well: Using a cutting machine to process and cut the base plate, and then welding the base plate to the well wall of the well; (3) Welding the elbow plate: Using the elbow plate to weld and fix the hull to the base plate; Step 2: Install the rudder propeller (1) Install the vibration isolation seat ring: hoist the rudder propeller into the well box seat from top to bottom. The rudder propeller has a base. The rudder propeller base stops descending 200mm away from the well box seat opening. Then adjust the overall direction of the rudder propeller so that the hoisting direction of the rudder propeller input end is perpendicular to the horizontal line. The rudder propeller has an input shaft. The rudder propeller input shaft is evenly drilled with 8 bolt holes with a diameter of 26mm at the corresponding well box seat opening. After the rudder propeller is drilled with bolt holes, hoist the rudder propeller. Then clean the surface of the rudder propeller input shaft where the bolt holes are located and install the vibration isolation seat ring. The vibration isolation seat ring is fixed to the bolt holes by bolts, and sealant is applied to the bolts. (2) Lifting the rudder propeller: The rudder propeller with the vibration isolation seat ring installed is lifted into the well box seat again. The vibration isolation seat ring stops at the well box seat opening. The base plate is welded at the well box seat opening. The vibration isolation seat ring is pressed on the base plate. Then, the joint between the base plate and the vibration isolation seat ring is sealed with sealant so that the side edge of the base plate on the well box seat opening is sealed and fitted to the side of the input shaft of the rudder propeller.

[0004] In existing technology, the rudder propeller needs to be fixed in the well housing first, and then the well housing is installed on the hull. This results in high requirements for the flatness of the well plate and high requirements for the processing quality of the well plate. If the well plate is deformed, the flatness is not up to standard, or the bolts are loose, a major accident may occur. In addition, sealing rings or seawater resistant gaskets are used between the hull well plate and the rudder propeller well housing to ensure the seawater seal. Utility Model Content

[0005] To address the issues of low connection strength between the hull and the propeller in existing technologies, and the high rigidity requirements of the propeller, the purpose of this invention is to provide a connection structure between the hull and the azimuth propeller. This structure can improve the connection strength between the propeller and the hull, thereby effectively improving the overall rigidity.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a connection structure between a hull and a fully azimuth-rotating rudder propeller, the rudder propeller including a cofferdam, a large flange fixed to the top of the cofferdam, and a first connecting plate sleeved and fixed to the bottom of the cofferdam; the hull is provided with mounting holes for receiving the cofferdam, a second annular connecting plate fixed to the top of the hull, and a third annular connecting plate fixed to the bottom of the hull, the mounting holes, the inner holes of the second connecting plate and the third connecting plate being coaxially arranged; the large flange of the cofferdam is inserted into the inner hole of the second connecting plate, and the large flange of the cofferdam is fixedly connected to the second connecting plate; the first connecting plate is inserted into the inner hole of the third connecting plate, and the first connecting plate and the third connecting plate are fixedly connected.

[0007] Preferably, the first connecting plate is welded and fixed to the large flange of the well; the second connecting plate is welded and fixed to the third connecting plate.

[0008] Preferably, the first connecting plate and the large flange of the well are fixedly connected by real-time symmetrical welding, and the second connecting plate and the third connecting plate are fixedly connected by real-time symmetrical welding.

[0009] As a preferred option, a welding slit is provided on the outer circular end of the large flange of the well.

[0010] Preferably, the top of the first connecting plate protrudes from the inside of the third connecting plate, and the top of the third connecting plate is welded to the outer peripheral surface of the first connecting plate; the bottom of the first connecting plate is welded to the inner wall of the third connecting plate.

[0011] Preferably, the hull includes radial plates; multiple radial plates are evenly disposed between a second connecting plate and a third connecting plate, and both the second connecting plate and the third connecting plate are fixedly connected to the radial plates; the second connecting plate, the third connecting plate, and the multiple radial plates form a mounting hole.

[0012] Preferably, an auxiliary plate is fixed to one end of the radial plate facing the mounting hole, and a support plate for supporting the well is fixed to the end face of the auxiliary plate facing the mounting hole.

[0013] Preferably, a rotatable rotary tube is installed inside the cofferdam, with the bottom of the rotary tube extending out of the cofferdam and fixedly connected to the lower housing of the rudder propeller.

[0014] Preferably, an upper mating flange is fixed at the bottom of the rotary tube, and a lower mating flange is provided on the lower housing. The upper and lower mating flanges are fixedly connected by double-ended studs.

[0015] As a preferred option, the double-ended stud is made of stainless steel.

[0016] The beneficial effects of this utility model are as follows: Using the above structure, a window matching only the rudder propeller cofferdam can be opened on the hull, allowing for the assembly of the hull and rudder propeller. This effectively improves the connection strength between the rudder propeller and the hull, thereby enhancing overall rigidity. The connection structure between the rudder propeller and the hull is a double-layer frame structure, which more effectively secures the rudder propeller, reduces bending moments at the cofferdam, prevents rudder propeller deformation, and protects the mechanical parts inside the cofferdam. Attached Figure Description

[0017] Figure 1 A schematic diagram of the connection structure between the hull and the propeller;

[0018] Figure 2 This is a schematic diagram showing the installation of the underwater part of the rudder propeller after the above-water part is mounted on the hull.

[0019] Figure 3 This is a structural diagram of the ship's hull;

[0020] Figure 4 for Figure 1 Enlarged view of point A in the middle.

[0021] Reference numerals: 1. Hull; 11. Mounting hole; 12. Second connecting plate; 13. Third connecting plate; 14. Radial plate;

[0022] 21. Upper housing; 22. Input flange; 23. Main shaft flange; 24. Main shaft; 25. Rotary pipe; 251. Upper mating flange; 26. First connecting plate; 261. Connecting part; 262. Tubular part; 27. Lower housing; 271. Lower mating flange; 28. Lifting point; 29. ​​Guide column; 20. Lower input shaft;

[0023] 3. Auxiliary tooling. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Example

[0029] like Figures 1 to 4 The above describes a connection structure between a hull and a fully azimuth-rotating rudder propeller. The rudder propeller includes a cofferdam 24, a large cofferdam flange 23 fixed to the top of the cofferdam 24, and a first connecting plate 26 fitted and fixed to the bottom of the cofferdam 24.

[0030] The hull 1 is provided with mounting holes 11 for receiving the cofferdam 24. A second annular connecting plate 12 is fixed to the top of the hull 1, and a third annular connecting plate 13 is fixed to the bottom of the hull 1. The mounting holes 11, the inner holes of the second connecting plate 12 and the inner holes of the third connecting plate 13 are coaxially arranged.

[0031] The large flange 23 of the well is inserted into the inner hole of the second connecting plate 12, and the large flange 23 of the well is fixedly connected to the second connecting plate 12; the first connecting plate 26 is inserted into the inner hole of the third connecting plate 13, and the first connecting plate 26 and the third connecting plate 13 are fixedly connected.

[0032] With this configuration, a window matching the rudder propeller cofferdam 24 can be opened on the hull, allowing the hull 1 and rudder propeller to be assembled. This effectively improves the connection strength between the rudder propeller and the hull 1, thereby enhancing overall rigidity. The connection structure between the rudder propeller and the hull is a double-layer frame structure, which more effectively secures the rudder propeller, reduces bending moments at the cofferdam, prevents rudder propeller deformation, and protects the mechanical parts inside the cofferdam.

[0033] In this embodiment, the first connecting plate 26 is welded and fixed to the cofferdam flange 23; the second connecting plate 12 is welded and fixed to the third connecting plate 13. Specifically, the first connecting plate 26 and the cofferdam flange 23 are fixedly connected by real-time symmetrical welding, and the second connecting plate and the third connecting plate 13 are fixedly connected by real-time symmetrical welding. With this configuration, the welding process of the hull 1 should be symmetrical in real-time to avoid deformation of the cofferdam flange 24 caused by unilateral welding. The cofferdam and the hull are welded as a whole, which can effectively avoid resonance with the hull and protect the rudder propeller structure.

[0034] A further preferred embodiment has a welding slit on the outer circular end of the large flange 23 of the well.

[0035] In this embodiment, as Figure 3 As shown, the hull 1 includes radial plates 14; multiple radial plates 14 are evenly disposed between a second connecting plate 12 and a third connecting plate 13, and both the second connecting plate 12 and the third connecting plate 13 are fixedly connected to the radial plates 14; the second connecting plate 12, the third connecting plate 13, and the multiple radial plates 14 form a mounting hole 11. This arrangement strengthens the connection between the hull 1 and the propeller, thereby improving the safety of the hull 1. More preferably, the third connecting plate 13 is a continuous annular plate.

[0036] In this embodiment, as Figure 1 and Figure 2As shown, an auxiliary plate is fixed to one end of the radial plate 14 facing the mounting hole 11, and a support plate for supporting the cofferdam 24 is fixed to the end face of the auxiliary plate facing the mounting hole 11. With this configuration, the support plate can provide support for the rudder propeller and provide coarse positioning assistance for the rudder propeller during installation; the top of the cofferdam 24 is fixed to the first connecting plate 26, the sides of the cofferdam 24 are supported by the support plate, and the bottom of the cofferdam 24 is fixedly connected to the third connecting plate 13, thereby ensuring the stability of the hull 1 and the rudder propeller during navigation.

[0037] In this embodiment, the top of the first connecting plate 26 protrudes from the inside of the third connecting plate 13, and the top of the third connecting plate 13 is welded to the outer peripheral surface of the first connecting plate 26; the bottom of the first connecting plate 26 is welded to the inner wall of the third connecting plate 13.

[0038] Further preferred, such as Figure 4 As shown, the first connecting plate 26 includes a connecting part 261 and a tubular part 262. The tubular part 262 is sleeved on the bottom of the well 24, and the connecting part 261 is disposed between the tubular part 262 and the well 24. The two ends of the connecting plate are fixedly connected to the tubular part 262 and the well 24, respectively.

[0039] In this embodiment, as Figure 1 , Figure 2 and Figure 4 As shown, a rotatable rotary pipe 25 is installed inside the manhole 24. The bottom of the rotary pipe 25 extends out of the manhole 24 and is fixedly connected to the lower housing 27. Specifically, an upper mating flange 251 is fixed to the bottom of the rotary pipe 25, and a lower mating flange 271 is provided on the lower housing 27. The upper mating flange 251 and the lower mating flange 271 are fixedly connected by double-ended studs. The double-ended studs are made of stainless steel.

[0040] In a further preferred embodiment, double nuts or anti-loosening nuts are used on the double-ended stud to prevent loosening of the rotary tube 25 and the lower housing 27.

[0041] In this embodiment, as Figure 1 and Figure 2As shown, the input flange 22, intermediate shaft, upper output shaft, vertical shaft, and propeller shaft are all rotatably mounted on the housing. The intermediate shaft and propeller shaft are arranged horizontally, while the upper output shaft, lower input shaft 20, and vertical shaft are arranged vertically. An upper input gear is fixed on the intermediate shaft, and an upper output gear is fixed at the upper end of the upper output shaft. The upper input gear and the upper output gear mesh for transmission. The upper output shaft is located above the lower input shaft 20, and the upper output shaft, vertical shaft, and lower input shaft 20 are coaxial and splined. The lower input gear is mounted on the lower input shaft 20, and the lower output gear is mounted on the propeller shaft. The lower input gear and the lower output gear mesh for transmission. One end of the propeller shaft extends out of the housing and is fitted with a propeller blade. The input flange 22 is connected to one end of the intermediate shaft via a clutch. The housing includes an upper housing 21, a cofferdam 24, a slewing bearing, a slewing tube 25, and a lower housing 27. The cofferdam 24 is fixed to the bottom of the upper housing 21. The slewing bearing and the slewing tube 25 are both located inside the cofferdam 24. The slewing bearing is rotatably mounted on the bottom of the upper housing 21, and the slewing tube 25 is fixed to the bottom of the slewing bearing. The slewing tube 25 is rotatably connected to the cofferdam 24, and its bottom extends out from inside the cofferdam 24. The lower housing 27 is fixed to the bottom of the slewing tube 25. The intermediate shaft, upper output shaft, and clutch are all mounted on the upper housing 21. The vertical shaft extends from the slewing bearing and the slewing tube 25 into the lower housing 27. The lower input shaft 20 and the propeller shaft are mounted inside the lower housing 27. For the specific structure of the azimuth rudder, please refer to existing technical documents such as CN220905310U and CN222117089U. Example

[0042] A method for assembling the azimuth propeller and hull 1 using the above-described connection structure:

[0043] The propeller includes an above-water section and an underwater section. The above-water section includes a cofferdam 24 and a rotary tube 25, and the underwater section includes the lower housing 27. The rotary tube 25 is rotatably installed inside the cofferdam 24, and the bottom of the rotary tube 25 exits from the cofferdam 24 and is detachably connected to the lower housing. The lower input shaft 20 on the lower housing 28 is inserted into and splined with the vertical shaft inside the rotary tube 25. The hull 1 has mounting holes 11 that are adapted to the cofferdam 24.

[0044] The assembly method includes the following steps:

[0045] Step 1): Hoist the above-water portion into the mounting hole 11 of the hull 1 from top to bottom;

[0046] Step 2): Weld the cofferdam 24 of the rudder propeller above water onto the hull 1;

[0047] Step 3): Check the welding quality and sealing, and verify the position of the above-water parts on the hull;

[0048] Step 4): Hoist the underwater part from bottom to top, fix the slewing tube of the above-water part to the lower box of the underwater part, and make the vertical shaft in the slewing tube and the lower input shaft of the lower box drive connection, thereby completing the rudder propeller assembly on the hull 1.

[0049] This configuration divides the rudder propeller into two parts: above water and underwater. After the above water part is installed on the hull, the above water part and the underwater part are connected. This avoids the requirement of an excessively large hull opening for a superstructure, reduces the size of the well box flange, and allows for overall hoisting of the rudder propeller. This method can reduce the hoisting weight, eliminates the need for overall hoisting, and avoids damage to the upper components of the rudder propeller.

[0050] In this embodiment, four lifting holes are provided on the large flange 23 of the well, and the four lifting holes are symmetrically arranged; in step 1) above, the lifting equipment is connected to the four lifting holes to lift the waterborne part of the rudder propeller onto the hull 1.

[0051] In this embodiment, before hoisting the above-water portion in step 1), auxiliary tools for adjusting the position of the cofferdam 24 are installed on the top of the hull 1. Specifically, as shown... Figure 2 As shown, auxiliary tooling 3 includes an L-shaped adjusting plate and an ejector bolt. The adjusting plate is fixed to the top of the cofferdam flange 23, and the ejector bolt is threadedly connected to the adjusting plate. Multiple auxiliary tooling pieces 3 are arranged around the mounting hole 11. After the above-water part is inserted into the mounting hole 11 of the hull 1, the ejector bolt is rotated to push the above-water part of the rudder propeller, adjusting the relative position of the above-water part and the mounting hole 11, and the center position of the rudder propeller input flange 22. During the process of correcting the center position of the rudder propeller input flange 22, the installation condition of the above-water part and the hull 1 is determined by comparing with the theoretical reference point. After the position of the above-water part meets the installation requirements, several pressure plates are welded onto the cofferdam flange 23 to fix the above-water part.

[0052] In this embodiment, in step 2) above, the first connecting plate 26 and the cofferdam flange 23 are fixedly connected by real-time symmetrical welding, and the second connecting plate and the third connecting plate 13 are fixedly connected by real-time symmetrical welding, thus fixing the waterborne part of the rudder propeller to the hull 1; after welding is completed, the auxiliary tooling 3 is removed.

[0053] In this embodiment, the method and requirements for checking the welding quality and sealing in step 3) above are consistent with the welding requirements for the outer plate of the hull 1.

[0054] In this embodiment, as Figure 1 and Figure 2As shown, multiple lifting points are provided on both the underwater section and the hull 1. In step 4) above, a lifting device is used to connect to the preset lifting points 28 on the underwater section, and the underwater section is pulled upward to connect the underwater section with the above-water section. Specifically, two lifting points 28 are provided at the bottom of the hull 1, located on either side of the mounting hole 11; one lifting point 28 is provided at the end of the lower housing 27 where the propeller blade is located, and three lifting points 28 are provided at the end of the lower housing 27 facing away from the propeller blade, arranged from top to bottom. More preferably, three lifting points 28 are used as the main lifting points, and the remaining lifting points 28 are used as auxiliary points to prevent the lifting device 3-8 from breaking and damaging the underwater section of the rudder propeller.

[0055] In this embodiment, after the above-water part is installed on the hull 1, the vertical shaft of the above-water part is suspended inside the rotating cylinder; the lower input shaft 20 of the underwater part is installed in the lower housing 27 of the underwater part through bearings, and the top of the lower input shaft 20 protrudes from the housing; the bottom of the vertical shaft is provided with an internal spline, and the top of the lower input shaft 20 is provided with an external spline.

[0056] In this embodiment, in step 4) above, before hoisting the underwater part of the rudder propeller, a pre-installed guide post 29 is installed on the upper mating flange 251 at the bottom of the above-water part; when hoisting the underwater part, the guide post 29 is inserted into the assembly hole on the lower mating flange 271 to guide the underwater part of the rudder propeller; then, fasteners are used to fix the upper mating flange 251 and the lower mating flange 271.

[0057] Furthermore, during the hoisting of the underwater section, the distance between the upper mating flange 251 and the lower mating flange 271 is monitored in real time. Before connecting the vertical shaft and the lower input shaft 20, the distance deviation between the upper mating flange 251 and the lower mating flange 271 is ensured to be within 0.5mm. The blade is rotated slightly to allow the top of the lower input shaft 20 to be smoothly inserted into the inner spline hole at the bottom of the vertical shaft.

[0058] Furthermore, after the splined fitting is 70% complete, remove the guide post 29 and use studs to secure the upper mating flange 251 and the lower mating flange 271. Then, use a 0.1mm feeler gauge to check the gap between the upper mating flange 251 and the lower mating flange 271, ensuring that the feeler gauge cannot be inserted. Double nuts 1-3 or anti-loosening nuts are used to prevent loosening of the studs. Both the studs and nuts 1-3 are made of stainless steel. When connecting the nuts and studs, the tightening torque requirements must be met.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A connection structure between a hull and a fully azimuth-rotor propeller, characterized in that: The rudder propeller includes a cofferdam (24), a large flange (23) is fixed to the top of the cofferdam (24), and a first connecting plate (26) is fitted and fixed to the bottom of the cofferdam (24); The hull (1) is provided with mounting holes (11) for receiving the cofferdam (24), the top of the hull (1) is fixed with an annular second connecting plate (12), and the bottom of the hull (1) is fixed with an annular third connecting plate (13). The mounting holes (11), the inner holes of the second connecting plate (12) and the inner holes of the third connecting plate (13) are coaxially arranged. The large flange (23) of the well is inserted into the inner hole of the second connecting plate (12), and the large flange (23) of the well is fixedly connected to the second connecting plate (12); the first connecting plate (26) is inserted into the inner hole of the third connecting plate (13), and the first connecting plate (26) and the third connecting plate (13) are fixedly connected.

2. The connection structure between the hull and the azimuth propeller according to claim 1, characterized in that: The first connecting plate (26) is welded and fixed to the cofferdam flange (23); the second connecting plate (12) is welded and fixed to the third connecting plate (13).

3. The connection structure between the hull and the azimuth propeller according to claim 2, characterized in that: The first connecting plate (26) and the large flange (23) of the well are fixedly connected by real-time symmetrical welding, and the second connecting plate (12) and the third connecting plate (13) are fixedly connected by real-time symmetrical welding.

4. The connection structure between the hull and the azimuth propeller according to claim 2, characterized in that: A welding cut is provided on the outer circular end of the large flange (23) of the well.

5. The connection structure between the hull and the azimuth propeller according to claim 2, characterized in that: The top of the first connecting plate (26) protrudes from the inside of the third connecting plate (13), and the top of the third connecting plate (13) is welded to the outer peripheral surface of the first connecting plate (26); the bottom of the first connecting plate (26) is welded to the inner wall of the third connecting plate (13).

6. The connection structure between the hull and the azimuth propeller according to claim 1, characterized in that: The hull (1) includes a radial plate (14); multiple radial plates (14) are evenly arranged between the second connecting plate (12) and the third connecting plate (13), and the second connecting plate (12) and the third connecting plate (13) are fixedly connected to the radial plate (14); the second connecting plate (12), the third connecting plate (13) and the multiple radial plates (14) form a mounting hole (11).

7. The connection structure between the hull and the azimuth propeller according to claim 6, characterized in that: An auxiliary plate is fixed to one end of the radial plate (14) facing the mounting hole (11), and a support plate for supporting the cofferdam (24) is fixed to the end face of the auxiliary plate facing the mounting hole (11).

8. The connection structure between the hull and the azimuth propeller according to claim 1, characterized in that: A rotatable rotary tube (25) is installed inside the cofferdam (24). The bottom of the rotary tube (25) extends out of the cofferdam (24) and is fixedly connected to the lower housing (27) of the rudder propeller.

9. The connection structure between the hull and the azimuth propeller according to claim 8, characterized in that: The bottom of the rotary tube (25) is fixed with an upper mating flange (251), and the lower housing (27) is provided with a lower mating flange (271). The upper mating flange (251) and the lower mating flange (271) are fixedly connected by double-ended studs.

10. The connection structure between the hull and the azimuth propeller according to claim 9, characterized in that: The double-ended stud is made of stainless steel.

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