Full-process installation process of extra-large full-revolving propeller

Abstract

The invention discloses a full-process mounting process of an extra-large full-revolving propeller. The full-process mounting process comprises the following steps: welding a sub-section to which a propeller base belongs; assemblage welding is performed in the base; welding a large assembly; carrying in sections; finish machining the end face of the base flange; bolt hole positioning and trepanning are conducted on the flange end face of the base; installing a full-rotation sealing plate; and hoisting the full-revolving propeller. According to the installation technology, through procedure forward movement, innovation of an in-situ finish machining technology and application of an efficient special tool, whole-process precise measurement and control and deformation compensation are implemented, and a large component hoisting centering method is optimized; the key technical problems of severe operation conditions, difficulty in precision control, long dock period and the like of the extra-large full-revolving thruster in later dock installation are successfully solved, and high-precision, high-efficiency and high-reliability installation is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rotary propeller installation, in particular to a full-process installation process of a full rotary propeller. BACKGROUND

[0002] At present, the largest diameter of SRE560 type full rotary propeller in China is up to 3170mm, and the biggest problem of using it in the field of ship is positioning, installation precision and adjustment control.

[0003] Because the diameter of SRE560 type full rotary propeller is up to 3170mm, the diameter of the base configured by it is up to 3650mm, and due to the special propelling mode of SRE560 type full rotary propeller, when it is assembled on a 15000DWT asphalt ship, it needs to be installed at an inclination of 4°, the error requirement is ±0.05°, the base panel flange needs to be precisely processed, the roughness requirement is Ra3.2, the flatness requirement is 0.50mm, and the SRE560 type full rotary propeller needs to be fixed on the base panel flange by bolt hanging, the bolts are arranged in a circle, the total number is 60, the positional deviation is 1.5mm, and the precision is φ39H13.

[0004] The technical difficulty of the installation process lies in the positioning and installation of the base, which is large in diameter and high in precision, and extremely difficult to control.

[0005] A full rotary propeller installation method is disclosed in Chinese patent application No. 201610630953.5, which comprises the following steps: installing a first base on the bottom plate of the ship body; then passing the transmission mechanism of the full rotary propeller through the lower end face of the first base in the direction from the top of the ship body to the bottom of the ship body, and installing the transmission mechanism on the first base; inserting the rotating mechanism of the full rotary propeller into the ship body in the direction from the bottom of the ship body to the top of the ship body and connecting it with the transmission mechanism; installing a second base on the ship body; preliminarily fixing the driving mechanism of the full rotary propeller on the second base; then connecting the output shaft of the driving mechanism with the transmission mechanism; positioning the driving mechanism through the centering process, then adjusting the position of the driving mechanism, and then fixing the driving mechanism on the second base again. It provides a method for installing the propeller in sections, and the installation of the base panel flange in the installation steps is arranged after the completion of the entire dock loading.

[0006] When the size of the full rotary propeller is too large, the base is installed after the completion of the dock loading, most of the welding work is overhead welding, the plate gauge is thick, and the welding mode is full penetration, which results in poor working conditions, large amount of work for workers, greatly increases the dock operation cycle, and the precision cannot be guaranteed when the base panel flange is installed with the base, and it is difficult to adjust the angle.

[0007] Therefore, it is necessary to provide a full-process installation process of a full-rotation propeller to solve the above technical problems. SUMMARY

[0008] The present application aims at the deficiencies of the prior art, and provides a full-process installation process of a full-rotation propeller with high operation precision.

[0009] To achieve the above object, the present application adopts the technical scheme of:

[0010] A full-process installation process of a full-rotation propeller, comprising the following steps:

[0011] Step 1, sub-assembly welding of the propeller base: place the base deck and the base flange in reverse state on the jig frame, set the base flange at an inclination angle of 4° to make the end face of the base flange horizontally placed; embed the base flange to the designated position of the base deck for positioning, establish the basic reference point by measuring and controlling the data by the total station instrument, sequentially assemble the surrounding structure of the base flange after positioning, and weld; after reverse state welding, check the flatness of the end face of the base flange and the longitudinal and transverse positioning size precision of the center again;

[0012] Step 2, welding of the middle assembly of the base: take the base deck as the base surface, hoist and weld the bulk small assembly, the middle assembly longitudinal wall, the perimeter reinforcement, the middle assembly bow bulkhead and the middle assembly stern bulkhead to the two sides along the center line of the base deck, after perfecting the internal structure of the middle assembly of the base, weld the middle assembly outer plate to complete the welding of the middle assembly of the base;

[0013] Step 3, welding of the large assembly: take the large assembly deck as the base surface, hoist and weld the strong transverse beam and the large assembly longitudinal wall, perfect the large assembly deck structure, hoist the middle assembly of the base to the upper side of the strong transverse beam and the large assembly longitudinal wall for welding and fixing, hoist and weld the large assembly stern bulkhead at the tail of the large assembly deck, weld and fix the side strong rib on the outside of the large assembly longitudinal wall, weld and fix the transverse bulkhead at the bow of the large assembly deck, perfect the internal structure of the large assembly, then weld and fix the large assembly outer plate to complete the welding of the large assembly;

[0014] Step 4, sub-assembly loading: turn over the large assembly and load it with the ship body, take the center of the end face of the base flange as the basic reference point, adjust the total station instrument at an inclination angle of 4° to measure and control the data, adjust the position of the large assembly according to the data, and raise the large assembly as a whole, with the tail of the large assembly raised by 5mm to leave a margin for welding heat shrinkage; optimize the welding sequence in the loading stage, and perform closing welding operation from the outside to the inside and from the middle to the two sides, detect the deviation of the flange caused by welding deformation at the same time of welding, and timely adjust the welding current and welding amount;

[0015] Step 5, finishing the end face of the base flange:

[0016] Step 501, setting reference points: four markers are set at the positions of 0°, 90°, 180° and 270° of the circumference of the base flange, reference points of the 4° inclined plane are marked on the markers using a total station instrument, and marks are made on the markers for subsequent centering of the finishing equipment installation foundation;

[0017] Step 502, erecting the finishing equipment: the finishing equipment is a vertical cyclone mill, the vertical cyclone mill is hoisted above the base flange, the adjustable support rods of the vertical cyclone mill are supported one by one with the pads of the inner wall of the base enclosure, the vertical cyclone mill is adjusted as a whole to the corresponding 4° inclination angle of the base flange, the axis of the base of the vertical cyclone mill is concentric with the center of the base flange, the milling cutter head of the vertical cyclone mill is adjusted to match the flatness of the end face of the base flange, and the end face of the base flange is milled by starting the vertical cyclone mill;

[0018] Step 503, rough milling: rough milling is performed on each stepped hole, the diameter and length dimensions of each stepped hole are left with a machining allowance of 1-1.5 mm, the cutting depth is not greater than 3 mm, the feed amount is 0.6 mm / r, the milling rod rotation speed is 10 r / min, and the roughness reaches 12.5. The milling rod is rechecked and the deflection of the milling rod is corrected.

[0019] Step 504, semi-finish milling: semi-finish milling is performed on each stepped hole, the diameter and length dimensions of each stepped hole are left with a machining allowance of 0.5 mm, the cutting depth is not greater than 1 mm, the feed amount is 0.3 mm / r, the milling rod rotation speed is 10 r / min, and the required roughness is not less than 6.3.

[0020] Step 505, finish milling: the cutting depth is not greater than 0.5 mm, the feed amount is 0.15 mm / r, the milling rod rotation speed is 10 r / min, the required roughness reaches 3.2, and the milled plane must be perpendicular to the center line of the base flange, and the perpendicularity tolerance should be not greater than 0.1 mm / m;

[0021] Step 6, positioning and opening holes on the end face of the base flange: the positioning and opening hole device includes a right angle sector circle compass and a short arc plate positioning tool, and the short arc plate positioning tool includes a short arc plate and a tiger mouth clamp;

[0022] Step 601, calibrating the right angle sector circle compass: calculate the inner diameter difference between the full rotation module flange and the base flange, and make the right angle sector circle compass fit the inner wall of the base flange, so that the structure of the right angle sector circle compass is clamped with the inner wall and the end face of the base flange, and the right angle sector circle compass is locked;

[0023] Step 602, drawing the reference sector circle line: keep the right angle sector circle compass tightly fitted with the inner wall of the base flange, and draw the sector circle line on the end face of the base flange with the drawing needle of the right angle sector circle compass;

[0024] Step 603, locate the first bolt hole and drill: use the total station to project the centerline to the end face of the base flange, and the intersection of the centerline projection and the pitch circle line is the position of the first bolt hole. Drill the hole with a magnetic drill;

[0025] Step 604, fix the short arc plate: place the short arc plate so that the leftmost hole of the short arc plate is aligned with the first bolt hole, and use the tiger mouth clamp to press and fix the short arc plate on the end face of the base flange;

[0026] Step 605, repeat drilling: drill holes along the spaces of the short arc plate, loosen the clamp, move the short arc plate so that the leftmost hole of the short arc plate is aligned with the last drilled bolt hole, re-fix the tiger mouth clamp, repeat the previous steps until the drilling of the entire base flange end face bolt hole is completed;

[0027] Step 7, install the full-rotation cover plate: make the cover plate jig and sample box, place the cover plate jig according to the ship body line, install the lower bottom plate, upper bottom plate in turn, cut the elbow plate excess, and install and weld the coaming;

[0028] Step 8, hoist the full-rotation propeller:

[0029] Step 801, install the full-rotation module: install the main lifting chain above the full-rotation module, and install four auxiliary chains between the main lifting chain and the full-rotation module. Adjust the inclination angle of the full-rotation module to 4° through the four auxiliary chains, then hoist the full-rotation module into the base well from bottom to top, so that the upper installation flange of the full-rotation module corresponds to the base flange. Install the scattered adjustment bolts, position the upper installation flange of the full-rotation module and the base flange, install the fastening bolts in cross sequence, and finally replace the adjustment bolts with fastening bolts;

[0030] Step 802, install the underwater unit: screw the sleeve lead screw into the underwater unit flange bolt hole, four sleeve lead screws are evenly distributed in the entire underwater unit flange ring, screw the guide pin on the sleeve lead screw, hoist the underwater unit and adjust the center of the underwater unit and the full-rotation module, and then move the underwater unit to the lower side of the full-rotation module. Align the underwater unit flange with the lower installation flange of the full-rotation module, insert and tighten four evenly distributed fastening bolts, remove the guide pin, continue to hoist the underwater unit and slowly tighten the four fastening bolts during the hoisting process, until the underwater unit flange tightly fits with the lower installation flange of the full-rotation module, remove the sleeve lead screw and install the remaining fastening bolts in cross sequence;

[0031] Step 803, install the fin: use the lifting eye ring of the fin to move the fin to the lower side of the underwater unit, and screw the fin and the underwater unit tightly with bolts. After installation, seal the lifting eye ring with rapid prototyping cement;

[0032] Step 804, install the driving motor: the shaft coupling is connected with the motor output shaft, the shaft coupling is heated to 170-200 DEG C, the end surface of the shaft coupling connected with the motor is ensured to be flush with the shaft section, the shaft coupling and the assembly diaphragm are installed, and after the installation of the shaft coupling and the motor is completed and completely cooled, the installed motor is hoisted to the full rotation module.

[0033] Preferably, in step 1, after the base flange is positioned, the center distance of the base flange is 5245 mm, the longitudinal position is FRO+5 mm, and the longitudinal and transverse accuracy requirements are ±1 mm. After positioning, the rigid support is fixed.

[0034] Compared with the prior art, the present application has the following advantages:

[0035] 1. Significantly improve installation accuracy and quality control: High-precision positioning of base flange in early stage: In the sub-assembly welding stage (step 1), the base flange is positioned and welded with a 4° inclination in reverse state, and the real-time measurement and control of the total station instrument is used to ensure the flatness of the flange end surface and the center positioning accuracy, laying a foundation for subsequent high-precision installation; In-situ finishing of flange end surface: innovatively using a vertical cyclone mill on the ship (step 6), through precise setting of a 4° inclination reference point and multi-stage milling, strictly controlling the cutting parameters, ensuring that the base flange end surface meets the ultra-high precision requirements, and meeting the strict requirements of large propeller inverted bolt fixation; Real-time welding deformation monitoring and compensation: during the sub-assembly welding (step 4), the welding sequence is optimized, the flange deformation is detected in real time, the welding parameters are dynamically adjusted, the influence of welding deformation on precision is actively controlled, and a 5mm allowance is reserved for the tail end to effectively compensate for the welding thermal shrinkage.

[0036] 2. Greatly optimize the working conditions and efficiency: Complete core welding in sub-assembly / total assembly stage: The welding work of base flange, base middle assembly, and large assembly (steps 1-3) is completed in the sub-assembly construction and total assembly stage, avoiding a large number of difficult overhead welding operations after the sub-assembly is loaded on the dock, which greatly improves the operating conditions of workers, reduces the labor intensity and safety risks.

[0037] 3. Effectively solve the special installation problem of large components: 4° inclination is accurately controlled throughout: from the initial base flange reverse positioning (step 1), sub-assembly measurement (step 4), flange finishing reference setting (step 601), finishing equipment adjustment (step 602) to propeller module hoisting angle adjustment (step 801), the whole process ensures that the key 4° installation inclination is accurately realized and controlled at each link through the setting of the jig, the application of the total station instrument, and the special hoisting tool. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a step flowchart of the present application;

[0039] Figure 2 is the construction schematic of step 1;

[0040] Figure 3 is the construction schematic of step 2;

[0041] Figure 4 is the construction schematic of step 3;

[0042] Figure 5 is the construction schematic of step 4;

[0043] Figure 6 is the structure schematic of the bulkhead jig;

[0044] Figure 7 is the installation schematic of the vertical cyclone mill;

[0045] Figure 8 is the construction schematic of step 702;

[0046] Figure 9 is the construction schematic of step 704;

[0047] Figure 10 is the structure schematic of the tiger mouth clamp;

[0048] Figure 11 is the structure schematic of the short arc plate;

[0049] Figure 12 is the hoisting schematic of the full-rotation propeller;

[0050] Wherein, 1-base flange, 2-middle sub-assembly of the base, 201-base deck, 202-dispersion sub-assembly, 203-middle sub-assembly longitudinal wall, 204-peripheral reinforcement, 205-middle sub-assembly bow bulkhead, 206-middle sub-assembly stern bulkhead, 207-middle sub-assembly outer plate, 3-large sub-assembly, 301-large sub-assembly deck, 302-strong cross beam, 303-large sub-assembly longitudinal wall, 304-large sub-assembly stern bulkhead, 305-broadside strong rib, 306-cross bulkhead, 307-large sub-assembly outer plate, 4-bulkhead jig, 5-vertical cyclone mill, 501-adjustable support rod, 502-base well, 503-vertical cyclone mill base, 504-milling cutter head, 6-right angle pitch circle compass, 7-short arc plate positioning tooling, 701-short arc plate, 702-tiger mouth clamp, 8-pitch circle line, 9-full-rotation module, 10-underwater unit, 11-fin DETAILED DESCRIPTION

[0051] The present application is further illustrated by the following drawings and detailed description, which should be understood as merely representative of the present application and not limiting the scope thereof, and after reading the present application, modifications of the present application by those skilled in the art in various equivalent forms fall within the scope defined by the appended claims.

[0052] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "arrangement", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship of two elements, unless otherwise explicitly limited, the above-mentioned terms in the present application can be understood according to the specific meaning in the present application by those skilled in the art.

[0053] In the present application, the terms such as "upper", "lower", "bottom", "top" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only a relationship word determined for the purpose of describing the structural relationship of the components or elements of the present application, and cannot be understood as a limitation on the present application.

[0054] As shown in FIG. 1, a full-flow installation process of a full-rotation propeller includes the following steps: Figures 1 to 12

[0055] Step 1, welding of propeller base sub-assembly: place the base deck and the base flange in the reverse state on the jig, set the base flange at an inclination angle of 4° to position the end face of the base flange horizontally; embed the base flange to the specified position of the base deck for positioning, establish a basic reference point by measuring and controlling the data of the total station instrument, the center distance of the base flange is 5245mm, the longitudinal position is FRO+5mm, and the longitudinal and transverse accuracy requirements are ±1mm, then use rigid support to fix the position, after the positioning is completed, assemble and weld the surrounding structure of the base flange in turn; after the reverse state welding is completed, check the flatness of the end face of the base flange and the longitudinal and transverse positioning size accuracy of the center again;

[0056] Step 2, welding of base middle assembly 2: take the base deck 201 as the base surface, hoist and weld the bulk small assembly 202, the middle assembly longitudinal wall 203, the perimeter reinforcement 204, the middle assembly bow bulkhead 205 and the middle assembly stern bulkhead 206 to both sides along the center line of the base deck, after perfecting the internal structure of the base middle assembly, weld the middle assembly outer plate 207 to complete the welding of the base middle assembly;

[0057] Step 3, welding of large assembly 3: take the large assembly deck 301 as the base surface, hoist and weld the strong transverse beam 302 and the large assembly longitudinal wall 303 to perfect the large assembly deck structure, hoist and weld the base middle assembly 2 to the upper part of the strong transverse beam and the large assembly longitudinal wall to fix, hoist and weld the large assembly stern bulkhead 304 at the tail of the large assembly deck, fix the side strong rib 305 outside the large assembly longitudinal wall, fix the transverse bulkhead 306 at the bow of the large assembly deck, perfect the internal structure of the large assembly, then weld the large assembly outer plate 307 to complete the welding of the large assembly;​

[0058] Step 4, segment loading: turn over the large group stand 3 and load it with the hull, take the center of the base flange end face as the basis reference point, adjust the total station instrument by 4° inclination to carry out data measurement and control, adjust the overall position of the large group stand according to the data, and lift the large group stand as a whole, with the tail of the large group stand upwarping by 5mm, leaving a margin for welding thermal contraction; optimize the welding sequence in the loading stage, and perform closing welding operation in the order from outside to inside and from the middle to both sides, detect the deviation of the flange caused by welding deformation at the same time of welding, and adjust the welding current and welding amount in time;

[0059] Step 5, finishing the base flange end face:

[0060] Step 501, setting reference points: set four stakes at the positions of 0°, 90°, 180° and 270° of the base flange circumference, use the total station instrument to mark the reference points of the 4° inclined plane on the stakes, and make marks on the stakes for the subsequent installation of the finishing equipment;

[0061] Step 502, erecting the finishing equipment: the finishing equipment is a vertical cyclone mill 5, hoist the vertical cyclone mill to above the base flange, make the adjustable support rods 501 of the vertical cyclone mill correspondingly support the pads in the inner wall of the base well 502, adjust the vertical cyclone mill as a whole to the corresponding 4° inclination of the base flange, make the axis of the vertical cyclone mill base 503 concentric with the center of the base flange, adjust the milling cutter head of the vertical cyclone mill to match the flatness of the milling cutter head 504 and the end face of the base flange, and start the vertical cyclone mill to mill the end face of the base flange;

[0062] Step 503, rough milling: rough mill each stepped hole, leave a processing margin of 1-1.5mm for the diameter and length dimensions of each stepped hole, the cutting depth is not greater than 3mm, the feed rate is 0.6mm / r, the milling rod rotation speed is 10r / min, and the roughness reaches 12.5, the milling rod is rechecked, and the deflection of the milling rod is corrected;

[0063] Step 504, semi-finish milling: semi-finish mill each stepped hole, leave a processing margin of 0.5mm for the diameter and length dimensions of each stepped hole, the cutting depth is not greater than 1mm, the feed rate is 0.3mm / r, the milling rod rotation speed is 10r / min, and the required roughness is not less than 6.3;

[0064] Step 505, finish milling: the cutting depth is not greater than 0.5mm, the feed rate is 0.15mm / r, the milling rod rotation speed is 10r / min, the required roughness reaches 3.2, and the milled plane must be perpendicular to the center line of the base flange, and the perpendicularity tolerance should be not greater than 0.1mm / m;

[0065] Step 6, bolt hole positioning and drilling on the base flange end face: the positioning and drilling device includes a right angle sector circle compass 6 and a short arc plate positioning tool 7, and the short arc plate positioning tool includes a short arc plate 701 and a tiger mouth clamp 702;

[0066] Step 601, calibration of the right angle sector circle compass: calculate the inner diameter difference between the full rotation module flange and the base flange, and make the right angle sector circle compass fit the inner wall of the base flange, so that the structure of the right angle sector circle compass is clamped with the inner wall and the end face of the base flange, and the right angle sector circle compass is locked;

[0067] Step 602, drawing of the reference pitch circle line: keep the right angle sector circle compass closely attached to the inner wall of the base flange, and draw a pitch circle line 8 on the end face of the base flange with the drawing needle of the right angle sector circle compass;

[0068] Step 603, positioning and drilling of the first bolt hole: project the centerline to the end face of the base flange with a total station, and the intersection of the centerline projection and the pitch circle line is the position of the first bolt hole, and the hole is drilled with a magnetic drill;

[0069] Step 604, fixing of the short arc plate: place the short arc plate so that the leftmost hole of the short arc plate is aligned with the first bolt hole, and the short arc plate is tightly fixed on the end face of the base flange with the tiger mouth clamp;

[0070] Step 605, repeated drilling: drill holes along the spaces of the short arc plate, loosen the clamp, move the short arc plate so that the leftmost hole of the short arc plate is aligned with the last drilled bolt hole, re-fix the tiger mouth clamp, and repeat the previous steps until the drilling of the bolt holes on the entire end face of the base flange is completed;

[0071] Step 7, installation of the full rotation cover plate: make a cover plate jig and a sample box, place the cover plate jig according to the ship body lines, install the lower bottom plate, the upper bottom plate in turn, cut the excess of the elbow plate, and install and weld the coaming;

[0072] Step 8, hoisting of the full rotation propeller:

[0073] Step 801, installation of the full rotation module: install the main hoisting chain directly above the full rotation module 9, and additionally install four auxiliary chains between the main hoisting chain and the full rotation module, adjust the inclination angle of the full rotation module to 4° through the four auxiliary chains, then hoist the full rotation module into the base well from bottom to top, so that the upper installation flange of the full rotation module corresponds to the base flange, install the dispersedly arranged adjusting bolts, position the upper installation flange of the full rotation module and the base flange, install the cross sequence fastening bolts, and finally replace the adjusting bolts with the fastening bolts;

[0074] Step 802, installing the underwater unit: screw the sleeve screw into the flange bolt hole of the underwater unit 10, four sleeve screws are evenly distributed in the flange ring of the underwater unit, screw the guide pin on the sleeve screw, lift the underwater unit and adjust the underwater unit with the full rotation module, and then transport the underwater unit to the lower side of the full rotation module. Align the flange of the underwater unit with the lower mounting flange of the full rotation module, insert four evenly distributed fastening bolts and tighten them, remove the guide pin, continue to lift the underwater unit and slowly tighten the four fastening bolts during lifting, until the flange of the underwater unit is tightly fitted with the lower mounting flange of the full rotation module, remove the sleeve screw and install the remaining fastening bolts in cross order;

[0075] Step 803, installing the fin: use the lifting eye ring of the fin 11 to transport the fin to the lower side of the underwater unit, and screw the fin with the underwater unit with bolts, and then seal the lifting eye ring with rapid forming cement after installation is completed;

[0076] Step 804, installing the drive motor: the shaft coupling is key connected with the motor output shaft, heat the shaft coupling hot oil to 170-200℃, ensure that the end surface of the shaft coupling connected with the motor is flush with the cross section of the motor shaft, install the shaft coupling and the assembly diaphragm, and then lift the installed motor to the full rotation module after the installation of the shaft coupling and the motor is completed and completely cooled.

[0077] The above description shows and describes the preferred embodiments of the present application, as previously described, it should be understood that the present application is not limited to the form disclosed herein, should not be considered as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein, by the above teaching or related technical or knowledge. The modifications and changes made by those skilled in the art without departing from the spirit and scope of the present application shall be within the scope of protection of the appended claims of the present application.

Claims

1. A complete installation process for an extra-large azimuth thruster, characterized in that, Includes the following steps: Step 1: Sub-segment welding of the propeller base: Place the base deck and base flange in reverse on the jig, with the base flange positioned at a 4° tilt angle so that the end face of the base flange is horizontal; pre-embed the base flange in the designated position on the base deck for positioning, establish the foundation reference point using total station measurement and control data, and after positioning, assemble the surrounding structure of the base flange in sequence and perform welding; after the reverse welding is completed, check the flatness of the end face of the base flange and the accuracy of the longitudinal and transverse positioning dimensions of the center again; Step 2, Welding of the base assembly: Using the base deck as the base surface, hoist and weld the bulk assembly, longitudinal wall of the mid-assembly, perimeter reinforcement, bow plate of the mid-assembly, and stern plate of the mid-assembly to both sides along the centerline of the base deck. After completing the internal structure of the base assembly, weld the outer plate of the mid-assembly to complete the welding of the base assembly. Step 3, Large Assembly Welding: Using the large assembly deck as the base surface, hoist and weld the strong crossbeam and the large assembly longitudinal bulkhead to complete the large assembly deck structure. Hoist the base assembly to the top of the strong crossbeam and the large assembly longitudinal bulkhead and weld it in place. Hoist and weld the large assembly stern sealing plate at the stern of the large assembly deck. Weld and fix the side strong ribs on the outside of the large assembly longitudinal bulkhead. Weld and fix the transverse bulkhead at the bow of the large assembly deck. After completing the internal structure of the large assembly, weld and fix the outer plate of the large assembly to complete the welding of the large assembly. Step 4, Segmented Assembly: Turn the large assembly over and assemble it with the hull. Using the center of the base flange end face as the basic reference point, adjust the total station to a 4° tilt angle for data measurement and control. Adjust the overall position of the large assembly based on the data, and raise the entire large assembly upwards, with the tail of the large assembly tilted up by 5mm to allow for welding heat shrinkage. Optimize the welding sequence during the assembly stage, performing the closure welding operation from the outside to the inside and from the middle to both sides. While welding, check the flange for deviations caused by welding deformation and adjust the welding current and welding volume in a timely manner. Step 5: Finish machining of the base flange end face: Step 501: Set reference points: Set four markers at 0°, 90°, 180° and 270° around the base flange. Use a total station to mark the reference point of the 4° inclined plane on the markers and mark it on the markers for the subsequent centering foundation for the installation of the precision machining equipment. Step 502: Set up the finishing equipment: The finishing equipment is a vertical cyclone milling machine. Hoist the vertical cyclone milling machine above the base flange, so that the adjustable support rod of the vertical cyclone milling machine corresponds to the pads on the inner wall of the base well. Adjust the vertical cyclone milling machine to a 4° tilt angle corresponding to the base flange, so that the axis of the vertical cyclone milling machine base is concentric with the center of the base flange. Adjust the milling cutter head of the vertical cyclone milling machine to match the flatness of the milling cutter head with the end face of the base flange. Start the vertical cyclone milling machine to mill the end face of the base flange. Step 503, rough milling: rough mill each stepped hole, leaving a machining allowance of 1-1.5mm for both the diameter and length of each stepped hole, with a cutting depth of no more than 3mm, a feed rate of 0.6mm / r, a milling bar speed of 10r / min, and a surface roughness of 12.

5. Then, recalibrate the milling bar and correct its deflection. Step 504, Semi-finish milling: Perform semi-finish milling on each stepped hole, leaving a machining allowance of 0.5mm for both the diameter and length of each stepped hole, with a cutting depth of no more than 1mm, a feed rate of 0.3mm / r, a milling bar speed of 10r / min, and a surface roughness of no less than 6.

3. Step 505, finish milling: depth of cut not greater than 0.5mm, feed rate 0.15mm / r, milling bar speed 10r / min, surface roughness required to reach 3.2, the milled surface must be perpendicular to the center line of the base flange, and the perpendicularity tolerance should not be greater than 0.1mm / m; Step 6: Locate and drill bolt holes on the base flange end face: The positioning and drilling device includes a right-angle pitch circle compass and a short arc plate positioning fixture. The short arc plate positioning fixture includes a short arc plate and a jaw clamp. Step 601: Calibrate the right-angle pitch circle gauge: Calculate the difference in inner diameter between the full-rotation module flange and the base flange, and use the right-angle pitch circle gauge to fit against the inner wall of the base flange, so that the structure of the right-angle pitch circle gauge is locked with the inner wall and end face of the base flange. Step 602: Draw the reference pitch circle line: Keep the right-angle pitch circle compass close to the inner wall of the base flange, and use the drawing needle of the right-angle pitch circle compass to draw the pitch circle line on the end face of the base flange. Step 603: Locate and drill the first bolt hole: Use a total station to project the ship's centerline onto the end face of the base flange. The intersection of the ship's centerline projection and the pitch circle line is the location of the first bolt hole. Drill the hole using a magnetic drill. Step 604: Fix the short arc plate: Place the short arc plate so that the leftmost hole of the short arc plate is aligned with the first bolt hole, and use the gripper to press and fix the short arc plate to the end face of the base flange. Step 605: Repeat drilling: Drill holes along the gaps in the short arc plate, loosen the clamp, move the short arc plate so that the leftmost hole of the short arc plate is aligned with the last drilled bolt hole, re-fix the clamp, and repeat the above steps until the drilling of bolt holes on the entire base flange end face is completed. Step 7: Install the full-rotation sealing plate: Make the sealing plate jig and template box, place the sealing plate jig according to the hull line, install the lower bottom plate and upper bottom plate in sequence, cut the elbow plate allowance, and install and weld the cofferdam. Step 8: Hoisting the full-rotation thruster: Step 801: Install the full slewing module: Install the main hoisting chain directly above the full slewing module, and add four auxiliary chains between the main hoisting chain and the full slewing module. Adjust the tilt angle of the full slewing module to 4° using the four auxiliary chains. Then hoist the full slewing module into the base well from bottom to top, so that the upper mounting flange of the full slewing module corresponds to the base flange. Install the distributed adjusting bolts to position the upper mounting flange of the full slewing module and the base flange. Install the fastening bolts in a cross sequence. Finally, replace the adjusting bolts with the fastening bolts. Step 802, Install the underwater unit: Screw the sleeve screws into the bolt holes of the underwater unit flange. Four sleeve screws are installed and evenly distributed throughout the entire underwater unit flange ring. Tighten the guide pins on the sleeve screws. Lift the underwater unit and align it with the full-rotation module. Move the underwater unit below the full-rotation module. Align the underwater unit flange with the lower mounting flange of the full-rotation module. Insert and tighten the four evenly distributed fastening bolts. Remove the guide pins. Continue lifting the underwater unit and slowly tighten the four fastening bolts during lifting until the underwater unit flange and the lower mounting flange of the full-rotation module are tightly fitted. Remove the sleeve screws and install the remaining fastening bolts in a crisscross sequence. Step 803, Install the fin: Using the lifting eye ring of the fin, move the fin to the bottom of the underwater unit, tighten the fin to the underwater unit with bolts, and seal the lifting eye ring with quick-setting cement after installation. Step 804: Install the drive motor: The coupling is keyed to the motor output shaft. Heat the hot oil for installing the coupling to 170-200℃ to ensure that the end face of the coupling connected to the motor is flush with the cross-section of the motor shaft. Install the coupling and the diaphragm assembly. After the coupling and motor are installed and completely cooled, hoist the installed motor onto the full-rotation module.

2. The complete installation process of an extra-large azimuth thruster according to claim 1, characterized in that: In step 1, after the base flange is positioned, the center distance between the base flanges is 5245mm, the longitudinal position is FRO+5mm, and the longitudinal and transverse accuracy requirements are ±1mm. After positioning, it is fixed with rigid support.

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