Propeller mounting method and construction system

Abstract

The application provides a propeller mounting method and construction system, comprising the following steps: S1: selecting an auxiliary tool; S2: fixing the auxiliary tool to a module vehicle; S3: hoisting and suspending the propeller, adjusting the loading angle of the auxiliary tool until the connecting line between the two loading brackets of the auxiliary tool and the center line of the propeller hub are located on the same vertical plane, and then lowering the propeller onto the two loading brackets; S4: rotating the propeller disc to be in the same direction as the auxiliary tool in the length direction; S5: driving the module vehicle carrying the propeller to the stern of the ship, adjusting the loading angle so that the propeller shaft and the center line of the shafting are located on the same vertical plane; S6: adjusting the height of each loading bracket respectively to make the propeller inclined; and S7: moving the loading bracket forward and mounting the propeller in place. The mounting method can replace the existing track transportation mode, realize multi-angle and multi-direction transportation, reduce track laying, and the propeller can pass through narrow spaces by adjusting the direction, and the operation is more flexible.

Description

Technical Field

[0001] This application belongs to the field of marine technology, and in particular relates to a propeller installation method and construction system. Background Technology

[0002] The installation of the propeller, a crucial component of a ship's power output, is vital and directly impacts the launching process. With the increasing displacement and volume of modern ships, the size and weight of propellers have also increased, posing significant challenges to installation. A key difficulty lies in precisely transporting the propeller to its installation location. Firstly, the propeller's weight and irregular shape make hoisting difficult. Secondly, the installation location is at the rear end of the stern shaft or tailpipe, making it impossible for a crane to vertically move the propeller to the installation position. Therefore, specialized equipment must be used for the transport of the propeller before pumping pressure during installation.

[0003] Currently, most shipyards use stern-mounted platforms to install propellers. This method ensures the propeller is safely installed, but with the construction of new ships and increasingly tighter construction schedules, this installation method is revealing its limitations:

[0004] First, the rear mounting platform is large and heavy, making it inconvenient to transport. Since it travels on rails, laying the rails and reversing the rails also require a lot of manpower and time.

[0005] Secondly, to prevent floating ice from damaging the propeller, some ships operating in cold regions have ice blades installed below the stern tube. In this case, the large stern mounting platform cannot transport the propeller to the installation position, making installation impossible.

[0006] Finally, as the ship's displacement increases, the stern becomes heavier and requires more stern supports to stand at the stern. This makes the installation environment more cramped, and after installation, the stern installation platform does not have enough space to exit, so it can only be retracted laterally, making the process quite complicated.

[0007] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0008] In view of the shortcomings of the prior art described above, the purpose of this application is to provide a propeller installation method and construction system to solve the problems of cumbersome propeller installation preparation, time-consuming and labor-intensive installation process, and difficulty in installation in confined spaces in the prior art.

[0009] To achieve the above and other related objectives, this application provides a propeller mounting method, which includes the following steps:

[0010] S1: Select the auxiliary tooling corresponding to the propeller model;

[0011] S2: Hoist and securely install the auxiliary tooling onto the modular vehicle;

[0012] S3: Lift and suspend the propeller. The modular vehicle drives under the propeller and adjusts the loading angle of the auxiliary tooling until the line connecting the two loading brackets of the auxiliary tooling is on the same vertical plane as the center line of the lifted propeller hub. The propeller is lowered onto the two loading brackets and the lifting device is removed.

[0013] S4: Adjust the loading angle of the auxiliary tooling and rotate the propeller disk to be in the same direction as the auxiliary tooling in the length direction;

[0014] S5: The modular vehicle, equipped with a propeller, travels to the stern of the ship. The centerline of the modular vehicle and the centerline of the shaft system are located on the same vertical plane. During the journey, the loading angle of the auxiliary tooling is adjusted so that the propeller shaft and the centerline of the shaft system are located on the same vertical plane.

[0015] S6: Adjust the height of each loading bracket to tilt the propeller, and at the same time adjust the horizontal direction of the auxiliary tooling so that the propeller shaft coincides with the extension line of the shaft system centerline;

[0016] S7: Synchronously drive the two loading brackets to move forward, and the propeller is installed in place.

[0017] In one embodiment, the propeller mounting method further includes:

[0018] S8: Adjust the height of the two loading brackets so that they are detached from the propeller hub. The highest point of the two loading brackets is lower than the lowest point of the stern shaft bracket. The loading bracket closer to the stern shaft bracket is flipped to the side of the ship until it is lower than the lowest point of the propeller blade. The modular vehicle moves backward and takes away the auxiliary tooling from the installation area.

[0019] In one implementation, step S3 further includes:

[0020] Before lowering the propeller, adjust the opening distance between the two loading brackets of the auxiliary tooling to match the length of the propeller hub.

[0021] In one implementation, step S3 further includes:

[0022] As the propeller is lowered, before the propeller hub contacts the loading bracket, the height of the loading bracket is adjusted to match the propeller hub until the propeller hub contacts and sits on the two loading brackets.

[0023] In one implementation, step S5 further includes:

[0024] When the travel direction of the modular vehicle interferes with the rudder arm at the stern, before the modular vehicle travels axially to the point where the propeller blades interfere with the rudder arm, the loading angle of the auxiliary tooling is adjusted so that the propeller blades avoid the rudder arm, and finally the propeller blades are turned 90 degrees so that the propeller shaft and the shafting centerline are on the same vertical plane.

[0025] In one implementation, step S7 further includes:

[0026] After the propeller is installed in place, install the pre-installed nut on the auxiliary tooling onto the propeller shaft, tighten the propeller, and the propeller installation is complete.

[0027] This application also provides a construction system for propeller installation, including auxiliary tooling, a modular vehicle, a lifting device, and a control system, wherein:

[0028] The auxiliary tooling is used to mount the propeller and is assembled on the modular vehicle;

[0029] The lifting device is used to lift the propeller and mount it on the auxiliary tooling;

[0030] The control system is connected to the auxiliary tooling and the modular vehicle, and executes the action commands of the auxiliary tooling and the modular vehicle through external control.

[0031] In one embodiment, the auxiliary tooling further includes:

[0032] Basic support;

[0033] A rotating mechanism is mounted on the foundation support and is rotatable relative to the foundation support;

[0034] The loading bracket includes a front paddle bracket and a rear paddle bracket disposed opposite to each other above the rotating mechanism. The front paddle bracket and the rear paddle bracket are displaced in a first direction above the rotating mechanism via a guide mechanism.

[0035] A support mechanism is disposed on top of the propeller front bracket and the propeller rear bracket. The support mechanism includes a lifting mechanism, a longitudinal movement mechanism, and a support bracket. The support bracket is used to support the propeller mounted between the propeller front bracket and the propeller rear bracket. The lifting mechanism is disposed on the propeller front bracket and the propeller rear bracket and located below the support bracket to drive the support bracket to move in a third direction. The longitudinal movement mechanism is disposed between the lifting mechanism and the support bracket and drives the support bracket to move in a second direction.

[0036] In one embodiment, a flipping mechanism is provided on the propeller front bracket to control the flipping stroke of the propeller front bracket. When the propeller front bracket flips to a point lower than the lowest point of the propeller blade, the modular vehicle can be retracted out of the installation area.

[0037] Compared with the prior art, the technical solution provided in this application has the following beneficial effects:

[0038] 1. The propeller installation method of this application can replace the existing rail transportation method. The tooling is fixed on the auxiliary installation vehicle, which can realize multi-angle and multi-directional transportation, reduce the construction of rail laying, and eliminate the need for manual pulling and reversing during installation. The rotating mechanism can realize the propeller's rotation in place, which makes it easy to adjust the propeller shaft angle to align with the installation position. The lifting mechanism can adjust the propeller to the installation height, and the longitudinal movement mechanism can further fine-tune the distance between the propeller and the actual installation position to ensure smooth installation.

[0039] 2. During the propeller installation process of this application, the front and rear propeller brackets can move relative to each other, which is suitable for clamping propellers of different models and sizes. It is stable, anti-tilting, easy to adjust, and has wider applicability.

[0040] 3. The installation method of this application enables the propeller to be fed longitudinally. The propeller can be installed in a narrow space by adjusting its direction. After installation, the loading bracket can be flipped to achieve longitudinal withdrawal, making the operation more flexible and the applicability stronger. Attached Figure Description

[0041] Figure 1 This is a flowchart of the propeller installation method for this application;

[0042] Figure 2 A schematic diagram showing the propeller in its hoisted and positioned state;

[0043] Figure 3 This is a schematic diagram showing the propeller's position as it passes the rudder arm.

[0044] Figure 4 A schematic diagram illustrating the process of a rotating mechanism driving a propeller to rotate.

[0045] Figure 5 A schematic diagram showing the propeller alignment and installation status;

[0046] Figure 6 A schematic diagram showing the propeller in place;

[0047] Figure 7 This is a schematic diagram of the installation fixture structure used in the method of this application;

[0048] Figure 8 This is a schematic diagram of the propeller front bracket structure.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1. Foundation support;

[0051] 2. Rotating mechanism;

[0052] 3. Guiding mechanism;

[0053] 4. Paddle bracket; 401. Bracket pin;

[0054] 5. Paddle rear bracket; 501. Crane boom;

[0055] 6. Lifting mechanism;

[0056] 7. Longitudinal movement mechanism;

[0057] 8. Support bracket;

[0058] 9. Tilting mechanism; 901. Third hydraulic cylinder; 902. Connecting arm; 903. Rotating connecting plate; 904. Central shaft. Detailed Implementation

[0059] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and principles of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application.

[0060] It should be noted that you should refer to [link / reference]. Figures 1 to 8 The illustrations provided in this embodiment are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0061] Example 1

[0062] This application discloses a propeller installation method. See also Figure 1 The propeller installation method includes the following steps:

[0063] S1: Select the auxiliary tooling corresponding to the propeller model;

[0064] The specific process is as follows: First, based on the different models and specifications of the propellers, select the auxiliary tooling that best matches the propeller to be installed. This can greatly reduce the angle and displacement adjustments required during the later installation process. Two of the most common types of auxiliary tooling for propeller installation are provided. The first type has a base support 1 with a bottom frame size of 5m*5m*3.8m and a total weight of 60t. The second type has a base support 1 with a bottom frame size of 7m*7m*5.3m and a total weight of 86t. The longer side of the base support 1 is equipped with 3-5 bolts for fixed connection with the modular vehicle. Several lifting lugs are also provided on the side, spaced apart from the bolts, for hoisting the auxiliary tooling onto the modular vehicle.

[0065] S2: Hoist and securely install the auxiliary tooling onto the modular vehicle;

[0066] The specific process is as follows: the steel wire of the lifting device is passed through the lifting lug, and the auxiliary tooling is lifted and placed stably on the modular vehicle using a crane. The bolts on the foundation support 1 are connected to both sides of the modular vehicle to fix the auxiliary tooling and the modular vehicle into an integrated structure. The frame of the foundation support 1 is equipped with an electrical control system that can drive or control the tooling, or an electronic control panel is set up. Subsequently, the hydraulic system can be controlled by the operator via remote control signal to drive the tooling to make corresponding movements and complete the propeller installation process.

[0067] S3: Lift and suspend the propeller, drive the modular vehicle under the propeller, adjust the loading angle of the auxiliary tooling until the line connecting the two loading brackets of the auxiliary tooling is on the same vertical plane as the center line of the lifted propeller hub, lower the propeller onto the two loading brackets, and remove the lifting device;

[0068] The specific process is as follows: A crane is used to lift and suspend the propeller. The modular vehicle travels to below the propeller, and the loading angle of the auxiliary tooling is adjusted until the line connecting the two loading brackets of the auxiliary tooling is on the same vertical plane as the center line of the lifted propeller hub. Before lowering the propeller, the opening distance between the two loading brackets of the auxiliary tooling is adjusted to match the length of the propeller hub, ensuring effective contact between the propeller hub and the two loading brackets. Then, the propeller is lowered, and the height of the loading brackets is adjusted to rise and meet the propeller hub until the propeller hub contacts and sits on the two loading brackets. (See below) Figure 2 At this point, the operator can manually assist in removing the propeller's lifting device, and then slowly lower the height of the loading bracket until it reaches the theoretical installation height error range.

[0069] S4: Adjust the loading angle of the auxiliary tooling and rotate the propeller disk so that it is in the same direction as the auxiliary tooling in the length direction;

[0070] The specific process is as follows: In step S3, in order to smoothly mount the propeller on the loading bracket, the angle of the loading bracket is adjusted to a certain extent. After the propeller is mounted, the angle needs to be straightened, so that the propeller disk is rotated to be in the same direction as the auxiliary tooling in the length direction, so as to minimize the overall width of the auxiliary tooling and make it more flexible to pass through narrow installation spaces and avoid obstacles encountered during the process.

[0071] S5: See also Figure 3 The modular vehicle, equipped with a propeller, travels to the stern of the ship. The centerline of the modular vehicle and the centerline of the shaft system are on the same vertical plane. During the journey, the loading angle of the auxiliary tooling is adjusted so that the propeller shaft and the centerline of the shaft system are on the same vertical plane.

[0072] The specific process is as follows: The modular vehicle carrying the propeller is driven to the stern. At this point, the centerline of the modular vehicle and the centerline of the shaft system are on the same vertical plane, meaning the propeller shaft and the centerline of the mounting hole are perpendicular. For some ships, the rudder arm at the stern may interfere with the travel direction of the modular vehicle, obstructing its movement. Therefore, before the modular vehicle travels axially to the point where the propeller blades interfere with the rudder arm, while maintaining the ease of movement of the modular vehicle, the loading angle of the auxiliary tooling is adjusted to ensure the propeller blades avoid the rudder arm. (See [link to relevant documentation]). Figure 4 As the module vehicle continues to rotate, it passes the rudder arm, and the propeller blades eventually turn 90 degrees. At this point, the propeller shaft and the shaft system centerline are on the same vertical plane, which facilitates the next step of alignment and installation.

[0073] S6: See also Figure 5 Adjust the height of each loading bracket to tilt the propeller, and at the same time adjust the horizontal direction of the auxiliary tooling so that the propeller shaft coincides with the extension line of the shaft system centerline;

[0074] The specific process is as follows: the side of the loading bracket closer to the stern is the propeller front bracket 4, and the side farther from the stern is the propeller rear bracket 5. The propeller front bracket 4 is slowly raised so that the propeller hub on one side is raised at a certain angle. At the same time, the relative distance between the propeller front bracket 4 and the propeller rear bracket 5 is adjusted to control the propeller hub to be stably placed on the loading bracket, preventing the propeller from falling due to the increased mounting distance caused by the raising of the propeller front bracket 4. The loading bracket includes a longitudinal movement mechanism 7 that can adjust the longitudinal position of the propeller. By controlling the longitudinal movement mechanism 7, the propeller shaft is made to coincide with the extension line of the shaft centerline, preparing for the alignment and insertion of the propeller shaft.

[0075] S7: See also Figure 6 The two loading brackets are moved forward synchronously, and the propeller is installed in place. After the propeller is installed in place, the pre-installed nuts on the auxiliary tooling are installed on the propeller shaft, and the propeller is locked to complete the propeller installation.

[0076] The specific process is as follows: after selecting the corresponding auxiliary tooling in step S1, nuts and other accessories can be pre-installed on the auxiliary tooling. These accessories are suspended on the boom 501 of the propeller rear bracket. After the propeller shaft is installed in place, the boom 501 moves the accessories to the operating area. After the nuts are installed, pump pressure is applied. Finally, the final nuts and caps are installed to lock the propeller.

[0077] S8: Adjust the height of the two loading brackets to detach them from the propeller hub. The highest point of the two loading brackets should be lower than the lowest point of the stern shaft bracket. The loading bracket closer to the stern shaft bracket should be flipped to the side of the ship until it is lower than the lowest point of the propeller blade. The modular vehicle should then move backward, taking the auxiliary tooling away from the installation area.

[0078] The specific process is as follows: control the two loading brackets to lower their top trays to a certain height. Due to the size limitations of the loading brackets themselves, when the trays are lowered to the lowest point, the propeller front bracket 4 still cannot be directly retracted and withdrawn, as it will interfere with the propeller blades. However, for propeller installation work in a narrow installation area, there is not enough space for the modular vehicle to move laterally and then change direction to withdraw. It can only withdraw and leave the installation area through the original narrow passage. At this time, the propeller front bracket 4 needs to be driven to rotate to the side until it reaches the highest point, which is lower than the lowest point of the propeller blades. At this time, the modular vehicle moves backward, taking away the auxiliary tooling and withdrawing from the installation area, thus completing the propeller installation and auxiliary tooling recovery work.

[0079] Example 2

[0080] This embodiment provides a construction system for propeller installation. For ease of description, a coordinate system is defined as follows: Figure 7 As shown, the x-axis is parallel to the guide rail of the guide mechanism 3, and the x-axis is defined as the first direction; the y-axis is parallel to the longitudinal movement mechanism 7, and the y-axis is defined as the second direction; the z-axis is defined as the third direction, and the direction along the z-axis is the up and down direction.

[0081] See Figure 7 and Figure 8 The propeller installation system includes auxiliary tooling, modular vehicles, lifting equipment, and a control system, among which:

[0082] The auxiliary tooling is used to mount the propeller and assemble it on the modular vehicle;

[0083] The lifting device is used to lift the propeller and mount it on auxiliary tooling.

[0084] The control system is connected to the auxiliary tooling and modular vehicle, and executes the action commands of the auxiliary tooling and modular vehicle through external control.

[0085] In one implementation, the auxiliary tooling specifically includes:

[0086] The base support 1 is used to fix the tooling to other installation bases and to load the rotating mechanism 2, guiding mechanism 3, front paddle bracket 4, rear paddle bracket 5, lifting mechanism 6, longitudinal movement mechanism 7 and support bracket 8 set above it.

[0087] Rotating mechanism 2 is mounted on the base support 1 and can rotate around its center in the xy plane on the base support 1 to adjust the installation direction of the propeller.

[0088] The mounting bracket includes a front propeller bracket 4 and a rear propeller bracket 5 positioned opposite each other above the rotating mechanism 2. The propeller is mounted between the front propeller bracket 4 and the rear propeller bracket 5, specifically on a support bracket 8 mounted on top of the front propeller bracket 4 and the rear propeller bracket 5. The support bracket 8 is in direct contact with the propeller, providing support for it. The front propeller bracket 4 and the rear propeller bracket 5 are guided by a guide mechanism 3 to generate relative or unidirectional displacements above the rotating mechanism 2 along a first direction, i.e., the x-axis. By changing the distance between the front propeller bracket 4 and the rear propeller bracket 5, propellers with different hub specifications can be mounted, making the propeller more stably mounted between the front propeller bracket 4 and the rear propeller bracket 5, thus enhancing the adaptability of the installation fixture. In addition, the front propeller bracket 4 and the rear propeller bracket 5 can also be adjusted synchronously in the same direction to precisely position and fine-tune the x-axis position of the propeller installation, ensuring installation accuracy.

[0089] A support mechanism is disposed on top of the front propeller bracket 4 and the rear propeller bracket 5. The support mechanism includes a lifting mechanism 6, a longitudinal movement mechanism 7, and a support bracket 8. The support bracket 8 is used to support the propeller mounted between the front propeller bracket 4 and the rear propeller bracket 5. The lifting mechanism 6 is disposed on the front propeller bracket 4 and the rear propeller bracket 5 and located below the support bracket 8 to drive the support bracket 8 to move up and down along a third direction, i.e., the z-axis, to transport the propeller to a suitable installation height. The longitudinal movement mechanism 7 is disposed between the lifting mechanism 6 and the support bracket 8 and drives the support bracket 8 to move left and right along a second direction, i.e., the y-axis, to adjust the horizontal position of the propeller.

[0090] In one embodiment, a flipping mechanism 9 is provided on the propeller front bracket 4 to control the flipping stroke of the propeller front bracket 4. When the propeller front bracket 4 flips to the lowest point below the propeller blade, the modular vehicle can be retracted and exited from the installation area.

[0091] Specifically, the propeller front bracket 4 includes: a bracket front base movably connected to the guide mechanism 3, a bracket front support provided on the bracket front base, and an operating front platform provided on both sides of the bracket front support; the propeller rear bracket 5 has the same structure as the propeller front bracket 4 and is arranged opposite to it, including: a bracket rear base, a bracket rear support, and an operating rear platform.

[0092] A tilting mechanism 9 is provided on the propeller front bracket 4 to control the tilting stroke of the front support on the front base of the bracket. The front support is rotatably connected to the front base of the bracket via a central shaft 904. The tilting mechanism 9 specifically includes: a rotating connecting plate 903 movably connected to the central shaft 904; one free end of the rotating connecting plate 903 is movably connected to the front support of the bracket; the other free end of the rotating connecting plate 903 is movably connected to the front base of the bracket via a connecting arm 902; the connecting arm 902 is driven to reciprocate by a third hydraulic cylinder 901 provided on the front base of the bracket; and a bracket pin 401 is also provided on the propeller front bracket 4 to lock the tilting mechanism 9.

[0093] The method of flipping the front support of the bracket is as follows: First, remove the bracket pin 401, and drive the connecting arm 902 forward by the third cylinder 901 to push the rotating connecting plate 903 to rotate around the axis. In order to save space, the rotating connecting plate 903 is set to use a shorter lever arm to drive the longer lever arm to flip. In this application, when the front support of the bracket is flipped, the propeller has been removed from the fixture and installed. Therefore, the front support of the bracket is in an unloaded state. Thus, the third cylinder 901 has sufficient driving force to realize its flipping process. When the highest point of the front bracket 4 is lower than the lowest point of the propeller, the retraction of the fixture will not cause stroke interference and damage to the blade.

[0094] In summary, this application provides a propeller installation method that can replace existing rail transportation methods. It fixes the tooling on an auxiliary installation vehicle, enabling multi-angle and multi-directional transportation, reducing rail laying construction, and eliminating the need for manual pulling and reversing during installation. The rotating mechanism allows the propeller to rotate in place, facilitating propeller shaft angle adjustment and alignment with the installation position. The lifting mechanism adjusts the propeller to the installation height, and the longitudinal movement mechanism further fine-tunes the distance between the propeller and the actual installation position, ensuring smooth installation. This application's installation method allows for longitudinal propeller insertion, enabling the propeller to enter narrow spaces for installation by adjusting its direction. After installation, the loading bracket flips over to achieve longitudinal withdrawal, making the operation more flexible and applicable. Therefore, this application effectively overcomes the various shortcomings of existing technologies and has high industrial applicability.

[0095] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A propeller installation method, characterized in that, The propeller installation method includes the following steps: S1: Select the auxiliary tooling corresponding to the propeller model; S2: Hoist and securely install the auxiliary tooling onto the modular vehicle; S3: Lift and suspend the propeller. The modular vehicle drives under the propeller and adjusts the loading angle of the auxiliary tooling until the line connecting the two loading brackets of the auxiliary tooling is on the same vertical plane as the center line of the lifted propeller hub. The propeller is lowered onto the two loading brackets and the lifting device is removed. S4: Adjust the loading angle of the auxiliary tooling and rotate the propeller disk to be in the same direction as the auxiliary tooling in the length direction; S5: The modular vehicle, equipped with a propeller, travels to the stern of the ship. The centerline of the modular vehicle and the centerline of the shaft system are located on the same vertical plane. During the journey, the loading angle of the auxiliary tooling is adjusted so that the propeller shaft and the centerline of the shaft system are located on the same vertical plane. S6: Adjust the height of each loading bracket to tilt the propeller, and at the same time adjust the horizontal direction of the auxiliary tooling so that the propeller shaft coincides with the extension line of the shaft system centerline; S7: Synchronously drive the two loading brackets to move forward, and install the propeller in place; S8: Adjust the height of the two loading brackets so that they are detached from the propeller hub. The highest point of the two loading brackets is lower than the lowest point of the stern shaft bracket. The loading bracket closer to the stern shaft bracket is flipped to the side of the ship until it is lower than the lowest point of the propeller blade. The modular vehicle moves backward and takes away the auxiliary tooling from the installation area.

2. The propeller installation method according to claim 1, characterized in that, Step S3 also includes: Before lowering the propeller, adjust the opening distance between the two loading brackets of the auxiliary tooling to match the length of the propeller hub.

3. The propeller installation method according to claim 1, characterized in that, Step S3 also includes: As the propeller is lowered, before the propeller hub contacts the loading bracket, the height of the loading bracket is adjusted to match the propeller hub until the propeller hub contacts and sits on the two loading brackets.

4. The propeller installation method according to claim 1, characterized in that, Step S5 also includes: When the travel direction of the modular vehicle interferes with the rudder arm at the stern, before the modular vehicle travels axially to the point where the propeller blades interfere with the rudder arm, the loading angle of the auxiliary tooling is adjusted so that the propeller blades avoid the rudder arm, and finally the propeller blades are turned 90 degrees so that the propeller shaft and the shafting centerline are on the same vertical plane.

5. The propeller installation method according to claim 1, characterized in that, Step S7 also includes: After the propeller is installed in place, install the pre-installed nut on the auxiliary tooling onto the propeller shaft, tighten the propeller, and the propeller installation is complete.

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