A method for manufacturing a cantilever structure and a cantilever structure

Abstract

A method for manufacturing a cantilever structure, the manufacturing method comprising: making a first component: making a square tube, each side of the square tube is provided with a cantilever shaft mounting hole, the two cantilever shaft mounting holes are symmetrically arranged, a pre-processed cylindrical cantilever shaft is welded at each of the two cantilever shaft mounting holes, and the front vertical plate is welded to the rear of the square tube; making a second component: welding a rear vertical plate perpendicular to the wall plate; welding: welding the front vertical plate and the rear vertical plate into one body to obtain a cantilever structure; a cantilever structure comprises a square tube, a cylindrical cantilever shaft, a vertical plate and a wall plate, a flange plate is arranged at the bottom of the square tube, a cylindrical cantilever shaft is arranged on each side of the square tube, and the rear of the square tube is connected to the wall plate through the vertical plate. This design can ensure that the coaxiality of the two cantilever shafts on the cantilever structure meets the design requirements and reduce the deformation of the structure after processing.

Description

Technical Field

[0001] The present invention relates to the technical field of ship propulsion, and in particular to a method for manufacturing a cantilever structure and a cantilever structure, and is specifically suitable for manufacturing a cantilever structure connecting a motor propulsion device and a ship. Background Art

[0002] Motor propulsion devices are widely used in the field of ships. Motor propulsion devices use the rotation of the motor rotor to directly drive the blades to do work to propel the ship forward. In the motor propulsion device, the motor and the duct are integrated into one, the stator of the motor is set inside the duct, and the rotor of the motor and the blades of the duct are integrated into one. When the motor is working, it can directly drive the blades to rotate and do work to achieve the navigation of the ship. The heavy duct of the motor propulsion device needs to be connected to the hull through the flange on the cantilever structure.

[0003] In the prior art, when processing a cantilever structure, the two cantilever shafts on the cantilever structure need to remain coaxial. In order to ensure the processing accuracy, the two cantilever shafts are usually welded into one and then processed so that the size and accuracy of the cantilever shafts and other components on the cantilever structure meet the design requirements. However, for a cantilever structure with a larger size, the cantilever shafts at both ends extend out longer and the size of the cone under the cantilever shaft is also large, so a large grinder is required for processing, which is inconvenient and time-consuming. If the two cantilever shafts are assembled and welded after processing, the coaxiality of the two cantilever shafts is difficult to meet the design requirements, and for large cantilever structures, there is also the problem of deformation of the structure after welding. Therefore, there is a need for a cantilever structure manufacturing method and a cantilever structure that can make the coaxiality of the two cantilever shafts of the split structure in the cantilever structure meet the design requirements and avoid deformation of the structure after processing. Summary of the invention

[0004] The purpose of the present invention is to overcome the problem in the prior art that the two cantilever shafts of a split structure in a cantilever structural member with a larger size are difficult to process after assembly, resulting in the inability to ensure the coaxiality of the two cantilever shafts and the cantilever structural member is easily deformed after processing. A method for manufacturing a cantilever structural member and a cantilever structural member are provided, which can ensure the coaxiality of the two cantilever shafts in the cantilever structural member and avoid deformation of the structural member after welding.

[0005] To achieve the above objectives, the technical solution of the present invention is:

[0006] A method for manufacturing a cantilever structure, the manufacturing method comprising:

[0007] Step 1: Make the first component:

[0008] A1. Make a square tube, each side of which is provided with a cantilever shaft mounting hole, and the two cantilever shaft mounting holes are symmetrically arranged;

[0009] A2. Weld a pre-processed cylindrical cantilever shaft at each of the two cantilever shaft mounting holes;

[0010] A3. Weld the front vertical plate to the rear of the square tube;

[0011] Step 2: Make the second component:

[0012] Welding a rear vertical plate perpendicular to the wall panel to the wall panel;

[0013] Step 3: Welding:

[0014] The front vertical plate and the rear vertical plate are welded together to obtain a cantilever structure.

[0015] In the step A1, making the square tube specifically includes:

[0016] A11. Provide two first steel plates and two second steel plates, wherein the first steel plates are rectangular steel plates, the second steel plates are parallelogram steel plates, and cantilever shaft mounting holes are provided on the second steel plates;

[0017] A12, two first steel plates are arranged opposite to each other, two second steel plates are arranged opposite to each other, and the two first steel plates and the two second steel plates are welded together to obtain a hollow cylindrical structure surrounded by the two first steel plates and the two second steel plates;

[0018] A13. Weld a flange plate at the bottom of the hollow cylindrical structure.

[0019] The step A2 of welding a pre-processed cylindrical cantilever shaft at each of the two cantilever shaft mounting holes specifically includes:

[0020] A tooling dummy shaft is provided, the tooling dummy shaft comprises a left cylinder arm, a positioning cylinder and a right cylinder arm which are coaxially arranged, the end of the left cylinder arm is connected to one end of the positioning cylinder, the other end of the positioning cylinder is connected to the end of the right cylinder arm, the outer diameter of the left cylinder arm is equal to the outer diameter of the right cylinder arm, the outer diameter of the left cylinder arm and the outer diameter of the right cylinder arm are both matched with the inner diameter of the cantilever shaft, and the outer diameter of the left cylinder arm and the outer diameter of the right cylinder arm are both smaller than the outer diameter of the positioning cylinder;

[0021] A21. Insert the fixture dummy shaft into the two cantilever shaft mounting holes, and make the positioning cylinder located in the middle of the square cylinder;

[0022] A22. Sleeve the inner end of one cantilever shaft on the left cylinder arm, and sleeve the inner end of the other cantilever shaft on the right cylinder arm;

[0023] A23. Weld the two cantilever shafts sleeved on the left cylinder arm and the right cylinder arm respectively at the two cantilever shaft mounting holes.

[0024] The step A3 of welding the front vertical plate to the rear of the square tube specifically includes:

[0025] A31. Draw the assembly line of the front vertical plate on the rear wall of the square tube;

[0026] A32. Place the front vertical plate along its assembly line and make it perpendicular to the rear wall and flange plate of the square tube at the same time;

[0027] A33. Weld the front vertical plate and the rear wall of the square tube along the assembly line of the front vertical plate.

[0028] The step 1 of making the first assembly further includes setting a sealing plate at the opening at the top of the square cylinder;

[0029] The sealing plate is arranged at the opening at the top of the square tube specifically includes:

[0030] Place the sealing plate on the top of the square tube and weld the sealing plate and the square tube.

[0031] In the step 2, in making the second assembly, welding a rear vertical plate perpendicular to the wall panel on the wall panel specifically includes:

[0032] B1. Marking an assembly line of the rear vertical plate on the wall plate, placing the rear vertical plate along the assembly line of the rear vertical plate, and making the rear vertical plate perpendicular to the wall plate;

[0033] B2. Weld the rear vertical panel and the wall panel along the assembly line of the rear vertical panel.

[0034] The step 2 of making the second component also includes: welding a plurality of reinforcing rib plates between the rear vertical plate and the wall plate.

[0035] Step 3: During welding, the front vertical plate and the rear vertical plate are welded together, specifically including:

[0036] C1. Place the first component and the second component on the assembly platform, and keep the front and rear vertical plates in a vertical state, butt one side of the far tube of the front vertical plate with one side of the far wall plate of the rear vertical plate, and then clamp and fix the front and rear vertical plates with a fixture;

[0037] C2. Weld the joint between the front and rear vertical panels.

[0038] The fixture comprises a bracket and a clamping plate, the bracket comprises a base and a vertical positioning plate, the bottom of the positioning plate is vertically connected to the top of the base, and the positioning plate is arranged opposite to the clamping plate;

[0039] A first elongated operating hole is provided in the middle of the positioning plate, a first through hole is provided at the top and bottom of the positioning plate, a second operating hole corresponding to the first operating hole is provided in the middle of the clamping plate, a second through hole corresponding to the first through hole is provided at the top and bottom of the clamping plate, an internal thread is provided inside the first through hole, a same fastening bolt is provided in the corresponding group of first through holes and second through holes, and the screw of the fastening bolt passes through the second through hole and then matches with the thread of the first through hole;

[0040] In the step C1, clamping and fixing the front vertical plate and the rear vertical plate by a fixture specifically includes:

[0041] C11. Place the bracket on the assembly platform so that the butted front and rear vertical plates are located between the positioning plate and the clamping plate, and the first operating hole and the second operating hole are directly opposite to the butt joint between the front and rear vertical plates;

[0042] C12. Insert the same fastening bolt into the corresponding first through hole and second through hole, and lock the positioning plate and the clamping plate by the fastening bolt. The positioning plate and the clamping plate press and fix the front vertical plate and the rear vertical plate.

[0043] The cantilever structure comprises: a square tube, a cylindrical cantilever shaft, a vertical plate and a wall plate, the bottom of the square tube is provided with a flange plate, and a cylindrical cantilever shaft is provided on each side of the square tube, the two cantilever shafts are symmetrically arranged, the inner end of the cantilever shaft is fixedly arranged in a mounting hole on the tube wall of the square tube, and the interior of the cantilever shaft is connected with the interior of the square tube through the mounting hole;

[0044] The rear side wall of the square tube is connected to one side of the vertical plate, and the other side of the vertical plate is connected to the wall plate. The vertical plate is perpendicular to the rear side wall of the square tube, and the vertical plate is perpendicular to the wall plate. A plurality of reinforcing rib plates are arranged between the vertical plate and the wall plate.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] 1. In a method for manufacturing a cantilever structure of the present invention, the first component and the second component are first manufactured separately, and then the first component and the second component are welded together to obtain a cantilever structure, and the manufacturing process is simple; at the same time, when manufacturing the first component, two cylindrical cantilever shafts are first processed, and then the processed cylindrical cantilever shafts are welded to the mounting holes on both sides of the square tube, and there is no need to use a large grinder to process the installed cantilever shafts again after welding. When processing large cantilever structures, the processing time can be effectively shortened and the processing difficulty can be reduced. Therefore, the manufacturing process of the cantilever structure in this design is simple, and there is no need to use a large grinder to process the installed cantilever shaft after welding, which can effectively shorten the processing time and reduce the processing difficulty.

[0047] 2. In a manufacturing method of a cantilever structure of the present invention, before welding the cylindrical cantilever shaft, the tooling dummy shaft is first passed through the two mounting holes, and the two cantilever shafts are respectively sleeved on the two barrel arms of the tooling dummy shaft, and then the two cantilever shafts are welded. During the welding process, the tooling dummy shaft plays an auxiliary positioning role for the two cantilever shafts, and the two cantilever shafts always remain coaxial during the entire welding process, thereby ensuring that the coaxiality of the two cantilever shafts in the cantilever structure meets the design requirements. Therefore, in this design, the tooling dummy shaft is used to assist in positioning the two cantilever shafts when assembling the cylindrical cantilever shaft, which can ensure that the coaxiality of the two cantilever shafts in the cantilever structure meets the design requirements.

[0048] 3. In a method for manufacturing a cantilever structure of the present invention, the first component and the second component are first placed on an assembly platform, and the front and rear vertical plates are kept in a vertical state, and the front and rear vertical plates are connected and clamped and fixed by a fixture. The front and rear vertical plates are kept in a vertical state for welding, which can effectively avoid deformation of the vertical plates and ensure the processing accuracy of the cantilever structure. At the same time, since a base is provided in the fixture, the vertical positioning plate is fixedly installed on the base, and the fixture is placed on the assembly platform through the base, the weight of the fixture will not cause deformation of the vertical plates, and the fixture can provide certain support for the vertical plates, avoiding deformation of the cantilever structure during welding. Therefore, in this design, the front and rear vertical plates are kept in a vertical state for welding, and the fixture can provide certain support for the vertical plates, effectively preventing deformation of the cantilever structure during welding and improving the processing accuracy of the cantilever structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a structural schematic diagram of the cantilever structure.

[0050] Figure 2 It is the front view of the cantilever structure.

[0051] Figure 3 It is a top view of the cantilever structure.

[0052] Figure 4 It is a structural schematic diagram of the docking of the first component and the second component in the cantilever structure.

[0053] Figure 5 It is a schematic diagram of the structure of a square tube.

[0054] Figure 6 This is a top view of the square tube.

[0055] Figure 7 It is a structural diagram of the second component.

[0056] Figure 8 It is a structural diagram of the tooling dummy shaft.

[0057] Fig. 9 is a schematic diagram of a welded cantilever shaft.

[0058] Fig.10 It is a schematic diagram of pushing out the cut tooling dummy shaft from the cantilever shaft.

[0059] Fig.11 It is a schematic diagram of welding the front and rear vertical plates.

[0060] Fig.12 It is a schematic diagram of clamping and fixing the front vertical plate and the rear vertical plate by a fixture.

[0061] Fig.13 It is a schematic diagram of the fixture.

[0062] Fig.14 is a schematic diagram of the bracket.

[0063] Fig.15 is a schematic diagram of the splint.

[0064] In the figure: square tube 1, first steel plate 11, second steel plate 12, cantilever shaft mounting hole 121, cantilever shaft 2, vertical plate 3, front vertical plate 31, rear vertical plate 32, wall plate 4, flange plate 5, reinforcing rib plate 6, sealing plate 7, tooling dummy shaft 8, fixture tooling 9, bracket 91, base 911, positioning plate 912, rib plate 913, clamping plate 92, first operating hole 93, first through hole 94, second operating hole 95, second through hole 96, fastening bolt 97, left cylinder arm 81, positioning cylinder 82, right cylinder arm 83, first component 10, second component 20. DETAILED DESCRIPTION

[0065] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0066] See also Figures 1 to 15 A cantilever structure, the cantilever structure comprising: a square tube 1, a cylindrical cantilever shaft 2, a vertical plate 3 and a wall plate 4, a flange plate 5 is arranged at the bottom of the square tube 1, a cylindrical cantilever shaft 2 is arranged on each side of the square tube 1, the two cantilever shafts 2 are symmetrically arranged, the inner end of the cantilever shaft 2 is fixedly arranged in a mounting hole 121 on the tube wall of the square tube 1, and the interior of the cantilever shaft 2 is connected with the interior of the square tube 1 through the mounting hole 121;

[0067] The rear side wall of the square tube 1 is connected to one side of the vertical plate 3, and the other side of the vertical plate 3 is connected to the wall plate 4. The vertical plate 3 is perpendicular to the rear side wall of the square tube 1 and the wall plate 4, and a plurality of reinforcing rib plates 6 are arranged between the vertical plate 3 and the wall plate 4.

[0068] The vertical plate 3 is formed by welding two steel plates, a front vertical plate 31 and a rear vertical plate 32 .

[0069] A method for manufacturing a cantilever structure, the manufacturing method comprising:

[0070] Step 1: Making the first component 10:

[0071] A1. Make a square tube 1. Each side of the square tube 1 is provided with a cantilever shaft mounting hole 121. The two cantilever shaft mounting holes 121 are symmetrically arranged.

[0072] Among them, making the square tube 1 specifically includes:

[0073] A11. Provide two first steel plates 11 and two second steel plates 12. The first steel plates 11 are rectangular steel plates, the second steel plates 12 are parallelogram steel plates, and the second steel plates 12 are provided with cantilever shaft mounting holes 121.

[0074] A12, two first steel plates 11 are arranged opposite to each other, and two second steel plates 12 are arranged opposite to each other, and the two first steel plates 11 are parallel to each other, and the two second steel plates 12 are parallel to each other, the two first steel plates 11 and the two second steel plates 12 are fixed by spot welding, and then the weld between the steel plates is welded by CO2 gas shielded welding, and the two first steel plates 11 and the two second steel plates 12 are welded together to obtain a hollow cylindrical structure surrounded by the two first steel plates 11 and the two second steel plates 12;

[0075] A13. After obtaining the hollow cylindrical structure, a flange plate 5 is welded at the bottom of the hollow cylindrical structure;

[0076] Welding the flange plate 5 at the bottom of the hollow cylindrical structure specifically includes:

[0077] Place the flange plate 5 horizontally on the assembly platform, and place the hollow cylindrical structure on the top of the flange plate 5, so that the center line of the hollow cylindrical structure passes through the center point of the flange plate 5, and the second steel plate 12 in the hollow cylindrical structure is perpendicular to the flange plate 5;

[0078] When placing the hollow cylindrical structure on the top of the flange plate 5, first draw an assembly line of the hollow cylindrical structure on the top surface of the flange plate 5, and then place the hollow cylindrical structure along the assembly line of the hollow cylindrical structure;

[0079] After spot welding the connection between the bottom of the hollow cylindrical structure and the top of the flange plate 5, CO2 gas shielded welding is used to weld the weld between the hollow cylindrical structure and the flange plate 5. The welding of the flange plate 5 is completed to obtain the square tube 1. After obtaining the square tube 1, it needs to be corrected to ensure that the height of the square tube 1 and the flatness of the flange plate 5 meet the design requirements.

[0080] A2. Weld a pre-processed cylindrical cantilever shaft 2 at each of the two cantilever shaft mounting holes 121. During welding, use a tooling dummy shaft 8 to assist in assembling the cantilever shaft 2. The tooling dummy shaft 8 includes a left cylinder arm 81, a positioning cylinder 82, and a right cylinder arm 83 that are coaxially arranged. The end of the left cylinder arm 81 is connected to one end of the positioning cylinder 82, and the other end of the positioning cylinder 82 is connected to the end of the right cylinder arm 83.

[0081] The outer diameter of the left cylinder arm 81 is equal to the outer diameter of the right cylinder arm 83, and the outer diameter of the left cylinder arm 81 and the outer diameter of the right cylinder arm 83 are matched with the inner diameter of the cantilever shaft 2. In order to ensure the concentricity of the cantilever shaft 2, the outer surface of the left cylinder arm 81 and the right cylinder arm 83 are matched with the inner surface of the cylindrical cantilever shaft 2 with H8f7 tolerance. During the welding process, only a very small play gap is left between the outer surface of the cylinder arm and the inner surface of the cylindrical cantilever shaft 2, which can effectively improve the coaxiality of the two cylindrical cantilever shafts 2.

[0082] The outer diameter of the left cylinder arm 81 and the outer diameter of the right cylinder arm 83 are both smaller than the outer diameter of the positioning cylinder 82, and the outer diameter of the positioning cylinder 82 is larger than the inner diameter of the cantilever shaft 2. The positioning cylinder 82 limits the cantilever shaft 2. At the same time, the outer diameter of the positioning cylinder 82 is smaller than or equal to the aperture of the cantilever shaft mounting hole 121, so as to facilitate the insertion of the tooling dummy shaft 8 into the cantilever shaft mounting hole 121.

[0083] like Figure 6 , Fig. 9 As shown, the radial length of the positioning cylinder 82 is less than or equal to the distance L3 between the two second steel plates 12, and the two end surfaces of the positioning cylinder 82 can limit the cantilever shaft 2;

[0084] The process of welding a pre-processed cylindrical cantilever shaft 2 at each of the two cantilever shaft mounting holes 121 specifically includes:

[0085] A21, insert the tooling dummy shaft 8 into the two cantilever shaft mounting holes 121, and make the positioning cylinder 82 located in the middle of the square cylinder 1;

[0086] A22, install the cantilever shaft 2, so that the inner end of one cantilever shaft 2 is sleeved on the left cylinder arm 81, and the inner end of the other cantilever shaft 2 is sleeved on the right cylinder arm 83, and the inner end of the cantilever shaft 2 is inserted into the cantilever shaft installation hole 121; at this time, the concentricity of the two cantilever shafts 2 can be guaranteed to be within a certain range through the tooling dummy shaft 8;

[0087] A23. Keep the inner end of one cantilever shaft 2 sleeved on the left cylinder arm 81 and the inner end of the other cantilever shaft 2 sleeved on the right cylinder arm 83, and weld along the cantilever shaft mounting hole 121. The two cantilever shafts 2 sleeved on the left cylinder arm 81 and the right cylinder arm 83 are respectively welded to the two cantilever shaft mounting holes 121. The cantilever shaft 2 and the square cylinder 1 are welded as a whole, and the welding of the two cantilever shafts 2 is completed.

[0088] During the welding process, the positions of the two cantilever shafts 2 are first fixed by spot welding, and then the two cantilever shafts 2 are welded. The two cantilever shafts 2 are welded alternately to control welding deformation.

[0089] like Figure 8 As shown, when two cantilever shafts 2 are welded, in order to prevent the cantilever shafts 2 from deforming, a support frame is provided to support the cantilever shafts 2.

[0090] like Fig. 9 As shown, after the cantilever shaft 2 is welded, a part of the positioning cylinder 82 in the middle of the tooling dummy shaft 8 is cut off by a flame cutting method, and the cut portion can be taken out from the opening at the top of the square tube 1, and then lubricating oil is added to the two cantilever shafts 2, and then a press is used to push the left cylinder arm 81 and the right cylinder arm 83 into the interior of the square tube 1, and finally the left cylinder arm 81 and the right cylinder arm 83 pushed into the interior of the square tube 1 are taken out from the opening at the top of the square tube 1.

[0091] In order to facilitate the removal of the cut tooling dummy shaft 8 from the square tube 1 , the axial lengths of the left tube arm 81 and the right tube arm 83 are both smaller than the distance between the two cantilever shaft mounting holes 121 .

[0092] A3. Welding the front vertical plate 31 to the rear of the square tube 1, specifically including:

[0093] A31. Draw the assembly line of the front vertical plate 31 on the rear wall of the square tube 1: Draw the assembly line of the front vertical plate 31 on the first steel plate 11 as the rear wall of the square tube 1 according to the center line of the first steel plate 11;

[0094] The deviation of the assembly line of the front vertical plate 31 is ≤1mm;

[0095] A32, placing the front vertical plate 31 along the assembly line of the front vertical plate 31, and making the front vertical plate 31 perpendicular to the rear wall of the square tube 1 and the flange plate 5 at the same time, wherein the verticality between the front vertical plate 31 and the first steel plate 11 as the rear wall of the square tube 1 is ≤1mm;

[0096] A33, the front vertical plate 31 and the rear wall of the square tube 1 are welded along the assembly line of the front vertical plate 31 to complete the welding of the front vertical plate 31. In the process of welding the front vertical plate 31, the front vertical plate 31 is firstly fixed by positioning spot welding, and then the weld between the front vertical plate 31 and the first steel plate 11 is welded.

[0097] The step 1 of making the first assembly 10 also includes setting a sealing plate 7 at the opening at the top of the square tube 1;

[0098] The sealing plate 7 is arranged at the opening at the top of the square tube 1 and specifically includes:

[0099] After the cantilever shaft 2 is welded, the square tube 1 is placed on the assembly platform, and the sealing plate 7 is placed on the top of the square tube 1 , and the sealing plate 7 and the square tube 1 are welded.

[0100] In the process of welding the sealing plate 7, the sealing plate 7 is first fixed to the square tube 1 by positioning spot welding, and then a weld is performed along the outer circumference of the sealing plate 7.

[0101] The sealing plate 7 is a rectangular steel plate, and the shape of the sealing plate 7 matches the opening at the top of the square tube 1 .

[0102] The square tube 1 , the two cantilever shafts 2 , the flange plate 5 , the front vertical plate 31 , and the sealing plate 7 together constitute a first assembly 10 .

[0103] Step 2, making the second assembly: welding the rear vertical plate 32 perpendicular to the wall plate 4 on the wall plate 4;

[0104] The welding of the rear vertical plate 32 perpendicular to the wall plate 4 on the wall plate 4 specifically includes:

[0105] B1. Provide a wall panel 4 and a rear vertical panel 32, and mark an assembly line of the rear vertical panel 32 on the wall panel 4, wherein the assembly line of the rear vertical panel 32 is located in the middle of the wall panel 4;

[0106] Place the rear upright plate 32 along the assembly line of the rear upright plate 32 and make the rear upright plate 32 perpendicular to the wall plate 4, and the verticality between the rear upright plate 32 and the wall plate 4 is ≤1mm;

[0107] B2. Weld the rear vertical plate 32 and the wall plate 4 along the assembly line of the rear vertical plate 32.

[0108] During the welding process of the rear vertical plate 32 and the wall plate 4, the rear vertical plate 32 and the wall plate 4 are first fixed by positioning spot welding, and then the weld between the rear vertical plate 32 and the wall plate 4 is welded by CO2 gas shielded welding.

[0109] The step 2 of making the second assembly also includes: welding a plurality of reinforcing rib plates 6 between the rear vertical plate 32 and the wall plate 4 .

[0110] The welding of a plurality of reinforcing ribs 6 between the rear vertical plate 32 and the wall plate 4 specifically includes:

[0111] A plurality of reinforcing ribs 6 are symmetrically placed on both sides of the rear vertical plate 32, and the reinforcing ribs 6 are perpendicular to the rear vertical plate 32, and then welded to the rear vertical plate 32 and the wall plate 4 along the edge of the reinforcing ribs 6. During the welding process, the reinforcing ribs 6 are first fixed to the rear vertical plate 32 and the wall plate 4 by positioning spot welding, and then the welds between the reinforcing ribs 6 and the rear vertical plate 32 and the wall plate 4 are welded by CO2 gas shielded welding.

[0112] The wall panel 4 , the rear vertical panel 32 and the reinforcing rib plate 6 together constitute the second component 20 .

[0113] Step 3: Welding:

[0114] The front vertical plate 31 and the rear vertical plate 32 are welded together to obtain the cantilever structure.

[0115] like Figure 4 As shown, welding the front vertical plate 31 and the rear vertical plate 32 into one body specifically includes:

[0116] C1. Place the first component 10 and the second component 20 on the assembly platform, and keep the front vertical plate 31 and the rear vertical plate 32 in a vertical state, butt the side of the front vertical plate 31 far from the tube 1 with the side of the rear vertical plate 32 far from the wall plate 4, and then clamp and fix the front vertical plate 31 and the rear vertical plate 32 with the fixture 9;

[0117] C2. Weld the joint between the front vertical plate 31 and the rear vertical plate 32.

[0118] Use electron beam welding to weld the joint between the front vertical plate 31 and the rear vertical plate 32: first use electron beam welding to perform spot welding on the front vertical plate 31 and the rear vertical plate 32 to fix the front vertical plate 31 and the rear vertical plate 32. When performing spot welding, the interval between each two positioning welding points is 40-50mm. After the spot welding is completed, electron beam welding is performed on the weld between the front vertical plate 31 and the rear vertical plate 32. During the welding process, the weld is welded from top to bottom. After welding, keep warm for 0.5 hours before opening the vacuum chamber.

[0119] The edge of the front vertical plate 31 on the side far from the square tube 1 matches the edge of the rear vertical plate 32 on the side far from the wall plate 4, and the front vertical plate 31 and the rear vertical plate 32 are connected to form a complete vertical plate 3. During the processing, due to the different shapes and structures of the components, it is very inconvenient to directly weld the two sides of the complete vertical plate 3 to the square tube 1 and the wall plate 4. Therefore, the vertical plate 3 is divided into two steel plates, the front vertical plate 31 and the rear vertical plate 32. The front vertical plate 31 is assembled as a part of the first component 10, and the rear vertical plate 32 is assembled as a part of the second component 20. After the first component 10 and the second component 20 are completed, the front vertical plate 31 and the rear vertical plate 32 are welded together to obtain a complete vertical plate 3. The complete vertical plate 3 connects the first component 10 and the second component 20 as a whole.

[0120] like Fig.13 , Fig.14 , Fig.15 As shown, the fixture 9 includes a bracket 91 and a clamping plate 92, the bracket 91 includes a base 911 and a vertical positioning plate 912, the bottom of the positioning plate 912 is vertically connected to the top of the base 911, and the positioning plate 912 is arranged opposite to the clamping plate 92;

[0121] The middle of the positioning plate 912 is provided with a long first operation hole 93, the top and bottom of the positioning plate 912 are provided with a first through hole 94, the middle of the clamping plate 92 is provided with a second operation hole 95 corresponding to the first operation hole 93, the top and bottom of the clamping plate 92 are provided with a second through hole 96 corresponding to the first through hole 94, the first through hole 94 is provided with an internal thread inside, and the corresponding set of first through holes 94 and second through holes 96 are provided with the same fastening bolt 97, the screw of the fastening bolt 97 passes through the second through hole 96 and then threads with the first through hole 94. The positioning plate 912 and the clamping plate 92 can be locked by the fastening bolt 97, the front vertical plate 31 and the rear vertical plate 32 are both located between the positioning plate 912 and the clamping plate 92, and the positioning plate 912 and the clamping plate 92 can press and fix the front vertical plate 31 and the rear vertical plate 32.

[0122] At the same time, since a long first operating hole 93 is opened in the middle of the positioning plate 912, and a second operating hole 95 corresponding to the first operating hole 93 is opened in the middle of the clamping plate 92, when clamping the front vertical plate 31 and the rear vertical plate 32, the first operating hole 93 and the second operating hole 95 are placed opposite to the joint between the front vertical plate 31 and the rear vertical plate 32. After the front vertical plate 31 and the rear vertical plate 32 are pressed and fixed, welding operations can be performed through the first operating hole 93 and the second operating hole 95.

[0123] like Fig.11 , Fig.12 As shown, in the step C1, the front vertical plate 31 and the rear vertical plate 32 are clamped and fixed by the fixture 9, which specifically includes:

[0124] C11. Place the bracket 91 on the assembly platform so that the butted front vertical plate 31 and the rear vertical plate 32 are located between the positioning plate 912 and the clamping plate 92, and the first operating hole 93 and the second operating hole 95 are directly opposite to the butt joint between the front vertical plate 31 and the rear vertical plate 32;

[0125] C12. Insert the same fastening bolt 97 into the corresponding first through hole 94 and second through hole 96, and lock the positioning plate 912 and the clamping plate 92 by the fastening bolt 97. The positioning plate 912 and the clamping plate 92 press and fix the front vertical plate 31 and the rear vertical plate 32.

[0126] The cantilever structure includes: a square tube 1, a cylindrical cantilever shaft 2, a vertical plate 3 and a wall plate 4. The bottom of the square tube 1 is fixedly connected to the top of the flange plate 5. A cylindrical cantilever shaft 2 is arranged on each side of the square tube 1. The inner end of the cylindrical cantilever shaft 2 is fixedly arranged in a mounting hole on the tube wall of the square tube 1. The rear side wall of the square tube 1 is vertically connected to the front end of the vertical plate 3. The rear end of the vertical plate 3 is vertically connected to the wall plate 4. A plurality of reinforcing rib plates 6 are symmetrically arranged on both sides of the vertical plate 3. The side of the reinforcing rib plate 6 is vertically connected to the side wall of the vertical plate 3. The bottom of the reinforcing rib plate 6 is vertically connected to the side wall of the wall plate 4.

[0127] A rib plate 913 is also provided between the base 911 and the vertical positioning plate 912 to prevent the positioning plate 912 from being deformed. Since the bracket 91 includes the base 911 and the vertical positioning plate 912, the bracket 91 is placed on the assembly platform through the base, and the weight of the entire fixture 9 will not cause deformation of the vertical plate 3, thereby avoiding deformation of the structural parts after processing. At the same time, during the welding process of the front vertical plate 31 and the rear vertical plate 32, the front vertical plate 31 and the rear vertical plate 32 are both in a vertical state, which can also prevent the front vertical plate 31 and the rear vertical plate 32 from being deformed during the processing.

[0128] The principle of the present invention is described as follows:

[0129] The cantilever structure is used to connect the motor propulsion device with the hull. The flange plate 5 in the cantilever structure is connected to the conduit in the cantilever propulsion device. In the motor propulsion device, the stator of the motor is arranged inside the conduit, and the rotor of the motor is integrated with the blades of the conduit. When the motor is working, the blades of the conduit are driven to do work to realize the navigation of the ship. The cantilever structure can rotate with the two cantilever shafts 2 as the rotation center, and the motor propulsion device rotates with the cantilever structure. When the motor propulsion device is not needed, the motor propulsion device is driven to rotate to the inside of the hull through the cantilever structure. When the motor propulsion device is needed, the motor propulsion device is driven to rotate to the outside of the hull through the cantilever structure, and the motor propulsion device does work to propel the hull forward.

[0130] Embodiment 1:

[0131] A method for manufacturing a cantilever structure, the manufacturing method comprising:

[0132] Step 1: Making the first component 10:

[0133] A1. Make a square tube 1. Each side of the square tube 1 is provided with a cantilever shaft mounting hole 121. The two cantilever shaft mounting holes 121 are symmetrically arranged.

[0134] A2. Weld a pre-processed cylindrical cantilever shaft 2 at each of the two cantilever shaft mounting holes 121;

[0135] A3, welding the front vertical plate 31 to the rear of the square tube 1;

[0136] Step 2: Making the second component 20:

[0137] A rear vertical plate 32 is welded on the wall plate 4 and is perpendicular to the wall plate 4;

[0138] Step 3: Welding:

[0139] The front vertical plate 31 and the rear vertical plate 32 are welded together to obtain a cantilever structure.

[0140] In the step A1, making the square tube 1 specifically includes:

[0141] A11. Provide two first steel plates 11 and two second steel plates 12, wherein the first steel plates 11 are rectangular steel plates, the second steel plates 12 are parallelogram steel plates, and the second steel plates 12 are provided with cantilever shaft mounting holes 121;

[0142] A12, two first steel plates 11 are arranged opposite to each other, two second steel plates 12 are arranged opposite to each other, and the two first steel plates 11 and the two second steel plates 12 are welded together to obtain a hollow cylindrical structure surrounded by the two first steel plates 11 and the two second steel plates 12;

[0143] A13. Weld flange plate 5 at the bottom of the hollow cylindrical structure.

[0144] The step A2 of welding a pre-processed cylindrical cantilever shaft 2 at each of the two cantilever shaft mounting holes 121 specifically includes:

[0145] A tooling dummy shaft 8 is provided, the tooling dummy shaft 8 comprises a left cylinder arm 81, a positioning cylinder 82 and a right cylinder arm 83 which are coaxially arranged, the end of the left cylinder arm 81 is connected to one end of the positioning cylinder 82, the other end of the positioning cylinder 82 is connected to the end of the right cylinder arm 83, the outer diameter of the left cylinder arm 81 is equal to the outer diameter of the right cylinder arm 83, the outer diameter of the left cylinder arm 81 and the outer diameter of the right cylinder arm 83 are both matched with the inner diameter of the cantilever shaft 2, and the outer diameter of the left cylinder arm 81 and the outer diameter of the right cylinder arm 83 are both smaller than the outer diameter of the positioning cylinder 82;

[0146] A21, insert the tooling dummy shaft 8 into the two cantilever shaft mounting holes 121, and make the positioning cylinder 82 located in the middle of the square cylinder 1;

[0147] A22, install the cantilever shaft 2, so that the inner end of one cantilever shaft 2 is sleeved on the left cylinder arm 81, and the inner end of the other cantilever shaft 2 is sleeved on the right cylinder arm 83;

[0148] A23. Weld the two cantilever shafts 2 sleeved on the left cylinder arm 81 and the right cylinder arm 83 to the two cantilever shaft mounting holes 121 respectively.

[0149] The step A3 of welding the front vertical plate 31 to the rear of the square tube 1 specifically includes:

[0150] A31, draw the assembly line of the front vertical plate 31 on the rear wall of the square tube 1;

[0151] A32, placing the front vertical plate 31 along the assembly line of the front vertical plate 31, and making the front vertical plate 31 perpendicular to the rear wall of the square tube 1 and the flange plate 5 at the same time;

[0152] A33, welding the front vertical plate 31 and the rear wall of the square tube 1 along the assembly line of the front vertical plate 31.

[0153] The step 1, making the first assembly 10, further comprises setting a sealing plate 7 at the opening at the top of the square tube 1;

[0154] The sealing plate 7 is arranged at the opening at the top of the square tube 1 and specifically includes:

[0155] The sealing plate 7 is placed on the top of the square tube 1 , and the sealing plate 7 and the square tube 1 are welded.

[0156] A cantilever structure, comprising: a square tube 1, a cylindrical cantilever shaft 2, a vertical plate 3 and a wall plate 4, wherein a flange plate 5 is arranged at the bottom of the square tube 1, and a cylindrical cantilever shaft 2 is arranged on each side of the square tube 1, and the two cantilever shafts 2 are symmetrically arranged, and the inner end of the cantilever shaft 2 is fixedly arranged in a mounting hole 121 on the tube wall of the square tube 1, and the interior of the cantilever shaft 2 is connected with the interior of the square tube 1 through the mounting hole 121;

[0157] The rear side wall of the square tube 1 is connected to one side of the vertical plate 3, and the other side of the vertical plate 3 is connected to the wall plate 4. The vertical plate 3 is perpendicular to the rear side wall of the square tube 1, and the vertical plate 3 is perpendicular to the wall plate 4. A plurality of reinforcing rib plates 6 are arranged between the vertical plate 3 and the wall plate 4.

[0158] Embodiment 2:

[0159] Embodiment 2 is substantially the same as Embodiment 1, except that:

[0160] In the step 2, in making the second assembly, welding the rear vertical plate 32 perpendicular to the wall plate 4 on the wall plate 4 specifically includes:

[0161] B1. Draw an assembly line of the rear vertical plate 32 on the wall plate 4, place the rear vertical plate 32 along the assembly line of the rear vertical plate 32, and make the rear vertical plate 32 perpendicular to the wall plate 4;

[0162] B2. Weld the rear vertical plate 32 and the wall plate 4 along the assembly line of the rear vertical plate 32.

[0163] The step 2 of making the second assembly also includes: welding a plurality of reinforcing rib plates 6 between the rear vertical plate 32 and the wall plate 4 .

[0164] Embodiment 3:

[0165] Embodiment 3 is substantially the same as Embodiment 2, except that:

[0166] Step 3: welding the front vertical plate 31 and the rear vertical plate 32 into one body, specifically including:

[0167] C1. Place the first component 10 and the second component 20 on the assembly platform, and keep the front vertical plate 31 and the rear vertical plate 32 in a vertical state, butt the side of the front vertical plate 31 far from the tube 1 with the side of the rear vertical plate 32 far from the wall plate 4, and then clamp and fix the front vertical plate 31 and the rear vertical plate 32 with the fixture 9;

[0168] C2. Weld the joint between the front vertical plate 31 and the rear vertical plate 32.

[0169] The fixture 9 includes a bracket 91 and a clamping plate 92. The bracket 91 includes a base 911 and a vertical positioning plate 912. The bottom of the positioning plate 912 is vertically connected to the top of the base 911. The positioning plate 912 is arranged opposite to the clamping plate 92.

[0170] A long first operating hole 93 is provided in the middle of the positioning plate 912, a first through hole 94 is provided at the top and bottom of the positioning plate 912, a second operating hole 95 corresponding to the first operating hole 93 is provided in the middle of the clamping plate 92, a second through hole 96 corresponding to the first through hole 94 is provided at the top and bottom of the clamping plate 92, the first through hole 94 is provided with an internal thread inside, and the corresponding set of first through holes 94 and second through holes 96 are provided with the same fastening bolt 97, and the screw of the fastening bolt 97 passes through the second through hole 96 and then engages with the first through hole 94 threadedly;

[0171] In the step C1, the front vertical plate 31 and the rear vertical plate 32 are clamped and fixed by the fixture 9, specifically including:

[0172] C11. Place the bracket 91 on the assembly platform so that the butted front vertical plate 31 and the rear vertical plate 32 are located between the positioning plate 912 and the clamping plate 92, and the first operating hole 93 and the second operating hole 95 are directly opposite to the butt joint between the front vertical plate 31 and the rear vertical plate 32;

[0173] C12. Insert the same fastening bolt 97 into the corresponding first through hole 94 and second through hole 96, and lock the positioning plate 912 and the clamping plate 92 by the fastening bolt 97. The positioning plate 912 and the clamping plate 92 press and fix the front vertical plate 31 and the rear vertical plate 32.

[0174] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A method for manufacturing a cantilever structure, characterized in that: The manufacturing method comprises: Step 1: Make the first component (10): A1. Manufacturing a square tube (1), wherein each side of the square tube (1) is provided with a cantilever shaft mounting hole (121), and the two cantilever shaft mounting holes (121) are symmetrically arranged; A2. Welding a pre-processed cylindrical cantilever shaft (2) at each of the two cantilever shaft mounting holes (121); A3, welding the front vertical plate (31) to the rear of the square tube (1); Step 2: Making the second component (20): Welding a rear vertical plate (32) perpendicular to the wall plate (4) onto the wall plate (4); Step 3: Welding: The front vertical plate (31) and the rear vertical plate (32) are welded together to obtain a cantilever structure; The step A2 of welding a pre-processed cylindrical cantilever shaft (2) at each of the two cantilever shaft mounting holes (121) specifically comprises: A tooling dummy shaft (8) is provided, the tooling dummy shaft (8) comprising a left cylinder arm (81), a positioning cylinder (82) and a right cylinder arm (83) which are coaxially arranged, the end of the left cylinder arm (81) being connected to one end of the positioning cylinder (82), the other end of the positioning cylinder (82) being connected to the end of the right cylinder arm (83), the outer diameter of the left cylinder arm (81) being equal to the outer diameter of the right cylinder arm (83), the outer diameter of the left cylinder arm (81) and the outer diameter of the right cylinder arm (83) both matching the inner diameter of the cantilever shaft (2), and the outer diameter of the left cylinder arm (81) and the outer diameter of the right cylinder arm (83) both being smaller than the outer diameter of the positioning cylinder (82); A21. Insert the tooling dummy shaft (8) into the two cantilever shaft mounting holes (121), and place the positioning cylinder (82) in the middle of the square cylinder (1); A22, installing two cantilever shafts (2), so that the inner end of one cantilever shaft (2) is sleeved on the left cylinder arm (81), and the inner end of the other cantilever shaft (2) is sleeved on the right cylinder arm (83); A23. Weld the two cantilever shafts (2) sleeved on the left cylinder arm (81) and the right cylinder arm (83) to the two cantilever shaft mounting holes (121) respectively.

2. The method for manufacturing a cantilever structure according to claim 1, characterized in that: In the step A1, making the square tube (1) specifically comprises: A11. Two first steel plates (11) and two second steel plates (12) are provided, wherein the first steel plates (11) are rectangular steel plates, the second steel plates (12) are parallelogram steel plates, and the second steel plates (12) are provided with cantilever shaft mounting holes (121); A12, arranging two first steel plates (11) opposite to each other and two second steel plates (12) opposite to each other, and welding the two first steel plates (11) and the two second steel plates (12) together to obtain a hollow cylindrical structure surrounded by the two first steel plates (11) and the two second steel plates (12); A13. Weld a flange plate (5) to the bottom of the hollow cylindrical structure.

3. The method for manufacturing a cantilever structure according to claim 2, characterized in that: The step A3 of welding the front vertical plate (31) to the rear of the square tube (1) specifically comprises: A31, marking the assembly line of the front vertical plate (31) on the rear wall of the square tube (1); A32, placing the front vertical plate (31) along the assembly line of the front vertical plate (31), and making the front vertical plate (31) perpendicular to the rear wall of the square tube (1) and the flange plate (5); A33. Weld the front vertical plate (31) and the rear wall of the square tube (1) along the assembly line of the front vertical plate (31).

4. The method for manufacturing a cantilever structure according to claim 3, characterized in that: The step 1 of manufacturing the first assembly (10) further comprises providing a sealing plate (7) at the opening at the top of the square cylinder (1); The sealing plate (7) is arranged at the opening at the top of the square tube (1) and specifically comprises: The sealing plate (7) is placed on the top of the square tube (1), and the sealing plate (7) and the square tube (1) are welded.

5. The method for manufacturing a cantilever structure according to claim 1, characterized in that: In the step 2 of manufacturing the second assembly, welding the rear vertical plate (32) perpendicular to the wall plate (4) on the wall plate (4) specifically comprises: B1. Marking an assembly line of the rear upright plate (32) on the wall plate (4), placing the rear upright plate (32) along the assembly line of the rear upright plate (32), and making the rear upright plate (32) perpendicular to the wall plate (4); B2. Welding the rear vertical plate (32) and the wall plate (4) along the assembly line of the rear vertical plate (32).

6. The method for manufacturing a cantilever structure according to claim 5, characterized in that: The second step of manufacturing the second component further includes: welding a plurality of reinforcing rib plates (6) between the rear vertical plate (32) and the wall plate (4).

7. A method for manufacturing a cantilever structure according to any one of claims 1 to 6, characterized in that: Step 3: welding the front vertical plate (31) and the rear vertical plate (32) into one piece, specifically including: C1. Place the first component (10) and the second component (20) on an assembly platform, and keep the front vertical plate (31) and the rear vertical plate (32) in a vertical state, butt-join one side of the distal tube (1) of the front vertical plate (31) with one side of the distal wall plate (4) of the rear vertical plate (32), and then clamp and fix the front vertical plate (31) and the rear vertical plate (32) by means of a fixture (9); C2, welding the joint between the front vertical plate (31) and the rear vertical plate (32).

8. The method for manufacturing a cantilever structure according to claim 7, characterized in that: The fixture (9) comprises a bracket (91) and a clamping plate (92), the bracket (91) comprises a base (911) and a vertical positioning plate (912), the bottom of the positioning plate (912) is vertically connected to the top of the base (911), and the positioning plate (912) and the clamping plate (92) are arranged opposite to each other; A first elongated operating hole (93) is provided in the middle of the positioning plate (912), a first through hole (94) is provided at the top and bottom of the positioning plate (912), a second operating hole (95) corresponding to the first operating hole (93) is provided in the middle of the clamping plate (92), a second through hole (96) corresponding to the first through hole (94) is provided at the top and bottom of the clamping plate (92), an internal thread is provided inside the first through hole (94), a same fastening bolt (97) is provided in the corresponding group of first through holes (94) and second through holes (96), and the screw rod of the fastening bolt (97) passes through the second through hole (96) and then engages with the thread of the first through hole (94); In the step C1, the front vertical plate (31) and the rear vertical plate (32) are clamped and fixed by the clamp tool (9) and specifically include: C11. Place the bracket (91) on the assembly platform so that the butted front vertical plate (31) and the rear vertical plate (32) are located between the positioning plate (912) and the clamping plate (92), and the first operating hole (93) and the second operating hole (95) are directly opposite to the butt joint between the front vertical plate (31) and the rear vertical plate (32); C12. Insert the same fastening bolt (97) into the corresponding first through hole (94) and the second through hole (96), and lock the positioning plate (912) and the clamping plate (92) by means of the fastening bolt (97). The positioning plate (912) and the clamping plate (92) press and fix the front vertical plate (31) and the rear vertical plate (32).

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