Hydraulic propeller disassembly tool and centering method for large container ship

Abstract

The application discloses a large container ship propeller hydraulic dismounting tool and centering method, belongs to the technical field of ship propeller dismounting, and aims to solve the problem of poor clamping positioning stability and centering and unable stable clamping positioning dismounting operation. The application comprises a mounting seat, the center of the mounting seat is fixedly embedded with a bearing, the outer periphery of the mounting seat is circumferentially and uniformly provided with at least three groups of clamping and dismounting mechanisms, and the output end of each group of the clamping and dismounting mechanisms is correspondingly connected with a group of positioning and clamping mechanisms. The application is driven by a single hydraulic driving rod to synchronously drive all clamping components to make radial and concentric movements, so that the clamping center and the shaft center of the propeller and the stern shaft always coincide. The outer peripheral surface of the propeller hub is synchronously clamped by multiple groups of arc-shaped clamping plates, and the elastic deformation of the arc-shaped clamping plates made of flexible materials can realize high-adhesion surface contact with the outer surface of the hub with different radii.

Description

Technical Field

[0001] This invention belongs to the field of ship propeller disassembly technology, specifically relating to hydraulic disassembly tools and alignment methods for large container ship propellers. Background Technology

[0002] The propellers of large container ships are typically fitted onto the tapered section of the stern shaft using an interference fit. During ship maintenance and propeller replacement, the propeller needs to be disassembled. Currently, the industry standard for disassembly is hydraulic pull-out disassembly, which involves applying axial pulling force to the propeller using hydraulic tools, combined with high-pressure oil injection into the mating surface between the propeller and the stern shaft, to achieve propeller detachment.

[0003] In the aforementioned disassembly operations, propeller clamping and positioning are crucial for ensuring safe and smooth disassembly. Existing technologies for propeller disassembly often employ two-point or single-sided clamping structures, which have the following drawbacks: First, poor centering stability, failing to ensure the center of clamping force coincides with the axis of the propeller and stern shaft. This easily leads to uneven loading during axial pulling, causing scratches on the inner surface of the propeller cone bore and the conical surface of the stern shaft. In severe cases, it can even cause pulling jamming, component deformation, and damage, significantly increasing maintenance costs. Second, insufficient clamping stability, with low contact between the clamping surface and the outer surface of the propeller hub. Under heavy pulling forces, slippage and clamp loosening are likely, posing significant operational safety hazards. Third, poor adaptability; a single clamping set can only accommodate a single type of propeller hub. When dealing with propellers of different diameters and models for large container ships, frequent changes to clamping components are necessary, significantly reducing disassembly efficiency and increasing the workload of operators.

[0004] Therefore, a hydraulic disassembly tool for large container ship propellers is needed to solve the problem of poor clamping and positioning stability and centering in existing technologies, which makes it impossible to perform stable clamping, positioning and disassembly operations. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic disassembly tool and alignment method for large container ship propellers to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic dismantling tool for large container ship propellers, comprising a mounting base, wherein a bearing is fixedly embedded at the center of the mounting base, and a hydraulic drive rod axially penetrating the mounting base is interference-fitted to the inner ring of the bearing; at least three sets of clamping and dismantling mechanisms are evenly distributed circumferentially on the outer periphery of the mounting base, the power input end of each set of clamping and dismantling mechanisms is linked to the lower end of the hydraulic drive rod, and the output end of each set of clamping and dismantling mechanisms is correspondingly connected to a positioning and clamping mechanism; when the hydraulic drive rod is axially fed, the corresponding positioning and clamping mechanism is synchronously driven by each set of clamping and dismantling mechanisms to perform a concentric synchronous clamping action along the radial direction of the mounting base.

[0007] The solution specifies that the clamping and disassembly mechanism includes a connecting arm, which is fixedly connected to the surface of the mounting base. A sliding groove is formed near the upper part of the connecting arm, and a sliding block is slidably disposed within the groove. A movable groove is formed on the surface of the sliding block near the hydraulic drive rod, and a connecting rod is rotatably connected within the movable groove. A connecting shaft is rotatably connected to the end of the connecting rod away from the movable groove, and the top end of the connecting shaft is fixedly connected to the bottom of the hydraulic drive rod. A hinge seat is fixedly connected to the bottom of the sliding block, and a limit rod is fixedly connected to the hinge seat. A support rod is disposed below the hinge seat via the limit rod, and a matching strip groove is formed on the support rod corresponding to the limit rod. The support rod is slidably disposed on the hinge seat via the strip groove and the limit rod. A fixed shaft is rotatably connected to the bottom end of the support rod and fixedly connected to the connecting arm near the bottom.

[0008] It should be noted in the solution that there are four connecting arms, which are evenly connected to the outer surface of the mounting base.

[0009] It is worth noting that the positioning and clamping mechanism is located at the lower part of the mounting base via a connecting arm.

[0010] Furthermore, it should be noted that the positioning and clamping mechanism includes an arc-shaped gear, which is fixedly installed on the outer surface of one end of the bottom of the support rod. A rack is meshed on the lower part of the arc-shaped gear, and a matching limiting groove is opened in the connecting arm corresponding to the rack. An arc-shaped clamping plate is fixedly connected to one end of the inner side of the rack, and a limiting plate is fixedly connected to one end of the outer side of the rack.

[0011] In a preferred embodiment, the rack is slidably disposed within the connecting arm via a limiting groove.

[0012] In a preferred embodiment, the arc-shaped clamp is made of a flexible material, is arc-shaped, and has elastic deformation.

[0013] This invention also provides the following technical solution: a method for hydraulically disassembling and centering a large container ship propeller, implemented based on the hydraulic disassembly tool for large container ship propellers described in any of the above claims, comprising the following steps:

[0014] S1: Connect the hydraulic drive rod of the hydraulic disassembly tool to the external hydraulic drive device to complete the hoisting and positioning of the tool, so that the center of the tool's mounting base is initially aligned with the axial center of the propeller hub to be disassembled.

[0015] S2: Adjust the spatial posture of the tool so that the axial center line of the mounting base is coaxial with the axis of the ship's stern shaft, and at the same time maintain a uniform radial clearance between the arc-shaped clamping plates of each positioning and clamping mechanism and the outer circumferential surface of the propeller hub.

[0016] S3: Start the external hydraulic drive device, drive the hydraulic drive rod to rotate, and drive the corresponding positioning clamping mechanism to make a concentric synchronous feed along the radial direction of the mounting base through the synchronous linkage of the circumferentially distributed clamping and disassembly mechanisms, so that each set of arc-shaped clamping plates moves synchronously towards the outer circumferential surface of the propeller hub.

[0017] S4: Continuously control the rotation of the hydraulic drive rod until the inner clamping surfaces of each set of arc-shaped clamps are completely in contact with the outer circumference of the propeller hub. The surface contact clamping is achieved through the elastic deformation of the flexible arc-shaped clamps, keeping the clamping force of each set uniform and consistent, so that the clamping center of the tool, the axis of the propeller and the axis of the stern shaft are completely coaxial and coincident, thus completing the centering and locking.

[0018] S5: Inject high-pressure hydraulic oil into the mating surfaces of the propeller and the stern shaft to form a lubricating oil film and achieve static separation. At the same time, apply an axial pulling force coaxial with the stern shaft to the propeller through an external hydraulic pulling device. With the stable clamping of the disassembly tool, the propeller is pulled out smoothly along the stern shaft axis.

[0019] S6: After the propeller is completely disassembled, first release the axial pulling force and discharge the high-pressure hydraulic oil from the mating surface, then control the hydraulic drive rod to feed axially in the opposite direction, and drive the positioning clamping mechanism to synchronously and radially reset through the clamping disassembly mechanism, loosening the clamping on the propeller hub and completing the entire disassembly and centering operation.

[0020] In a preferred embodiment, during the synchronous centering clamping in step S3 and the fitting centering and locking in step S4, the axial feed of the hydraulic drive rod is controlled to achieve stepless adjustment of the clamping diameter, adapting to propeller hubs of different diameters. During the clamping process, at least three sets of clamping and disassembling mechanisms evenly distributed around the circumference act synchronously with the positioning clamping mechanism, ensuring that the coaxiality deviation between the clamping center and the stern shaft axis is no greater than 0.05mm throughout the entire process.

[0021] Compared with the prior art, the hydraulic dismantling tool for large container ship propellers provided by the present invention has at least the following beneficial effects:

[0022] (1) The present invention uses multiple sets of clamping and disassembly mechanisms evenly distributed in the circumference to cooperate with the positioning and clamping mechanism. A single hydraulic drive rod synchronously drives all clamping components to make radial centering movements, ensuring that the clamping center always coincides with the axis of the propeller and stern shaft. This fundamentally avoids the problem of off-center load during the pulling process, effectively prevents scratches and deformation of the propeller cone hole and stern shaft mating surface, greatly improves the accuracy and safety of disassembly operations, and solves the core pain point of poor centering in the prior art.

[0023] (2) The present invention uses multiple sets of arc-shaped clamps to simultaneously clamp the outer circumferential surface of the propeller hub. With the elastic deformation of the flexible material arc-shaped clamps, it can achieve high-degree contact with the outer surface of the hub with different curvatures, greatly improving the clamping friction. Under the action of large tonnage axial pulling force, there will be no slippage or loosening. At the same time, the circumferentially distributed clamping force can evenly distribute the load, avoid damage to the clamps or hub caused by local stress concentration, and ensure the stable progress of disassembly operations.

[0024] (3) The present invention can drive the clamping and disassembly mechanism to link the positioning clamping mechanism by adjusting the axial feed amount of the hydraulic drive rod, thereby realizing stepless adjustment of the clamping diameter. It can adapt to the clamping requirements of large container ship propeller hubs with different diameter specifications, without the need to replace clamping parts, greatly reducing the preparation time before operation, reducing the labor intensity of operators, and significantly improving the overall efficiency of propeller disassembly operation.

[0025] (4) The present invention can simultaneously complete the clamping and releasing actions of multiple clamping mechanisms with a single hydraulic drive source, without the need to adjust each clamping component step by step. The operation process is simple, greatly reducing the difficulty of operation for operators. At the same time, the overall structure is compact, with fewer transmission links and a low failure rate, which can adapt to the complex working conditions of shipyards. Attached Figure Description

[0026] Figure 1 This is a first-view structural schematic diagram of the hydraulic disassembly tool for large container ship propellers of the present invention.

[0027] Figure 2 This is a second-view structural schematic diagram of the hydraulic disassembly tool for large container ship propellers of the present invention.

[0028] Figure 3 This is a second-view structural schematic diagram of the hydraulic disassembly tool for large container ship propellers according to the present invention.

[0029] Figure 4 This is a schematic diagram of the internal cross-sectional structure of the hydraulic disassembly tool for large container ship propellers of the present invention;

[0030] Figure 5This is a schematic diagram of the cross-sectional structure of the hydraulic disassembly tool for large container ship propellers of the present invention.

[0031] Figure 6 This is a flowchart of the hydraulic disassembly and alignment method for the propeller of a large container ship according to the present invention.

[0032] In the diagram: 1. Mounting base; 2. Hydraulic drive rod; 3. Bearing; 4. Clamping and disassembling mechanism; 401. Connecting arm; 402. Slide groove; 403. Sliding block; 404. Hinge seat; 405. Support rod; 406. Movable groove; 407. Fixed shaft; 408. Connecting shaft; 409. Connecting rod; 4010. Limiting rod; 4011. Strip groove; 5. Positioning and clamping mechanism; 501. Arc gear; 502. Rack; 503. Limiting groove; 504. Arc clamping plate; 505. Limiting plate. Detailed Implementation

[0033] The present invention will be further described below with reference to embodiments.

[0034] Please see Figure 1-5 This invention provides a hydraulic disassembly tool for large container ship propellers, including a mounting base 1. A bearing 3 is fixedly embedded in the center of the mounting base 1, and a hydraulic drive rod 2 that axially penetrates the mounting base 1 is interference-fitted to the inner ring of the bearing 3. At least three sets of clamping and disassembly mechanisms 4 are evenly distributed circumferentially on the outer periphery of the mounting base 1. The power input end of each set of clamping and disassembly mechanisms 4 is linked to the lower end of the hydraulic drive rod 2, and the output end of each set of clamping and disassembly mechanisms 4 is correspondingly connected to a set of positioning and clamping mechanisms 5. When the hydraulic drive rod 2 is axially fed, the corresponding positioning and clamping mechanisms 5 are synchronously driven by each set of clamping and disassembly mechanisms 4 to perform a concentric synchronous clamping action along the radial direction of the mounting base 1.

[0035] The hydraulic drive rod 2 is connected to an external drive device, which causes the hydraulic drive rod 2 to rotate and drive the clamping and disassembly mechanism 4. This mechanism works in conjunction with the positioning and clamping mechanism 5 to clamp the propeller. At the same time, the positioning and clamping mechanism 5 can perform clamping and processing of propellers of different specifications according to the propeller specifications, thereby improving the practicality of the device.

[0036] In this embodiment, four sets of clamping and disassembly mechanisms 4 are preferably provided. The power input end of each set of clamping and disassembly mechanisms 4 is linked to the connecting shaft 408 at the lower end of the hydraulic drive rod 2. The output end of each set of clamping and disassembly mechanisms 4 is connected to a set of positioning and clamping mechanisms 5. When the hydraulic drive rod 2 rotates, the corresponding positioning and clamping mechanisms 5 are synchronously driven by each set of clamping and disassembly mechanisms 4 to perform a concentric synchronous clamping action along the radial direction of the mounting base 1.

[0037] Further as Figure 2 , Figure 3 and Figure 4As shown, it is worth noting that the clamping and disassembly mechanism 4 includes connecting arms 401. Four sets of connecting arms 401 are evenly distributed in a 90° ring on the outer surface of the mounting base 1. The connecting arms 401 and the mounting base 1 are integrally cast to ensure the overall structural strength. Each set of connecting arms 401 is a hollow box-shaped structure, forming a closed mounting cavity inside to accommodate the transmission components and prevent foreign objects from entering and causing transmission jamming during operation. A sliding groove 402 is provided near the upper part of the connecting arm 401. The sliding groove 402 is a T-shaped guide groove structure, and a matching T-shaped guide is slidably arranged in the sliding groove 402. The sliding block 403 is clearance-fitted with the slide groove 402, and the mating surfaces are coated with wear-resistant grease to ensure smooth sliding. At the same time, the T-shaped structure can prevent the sliding block 403 from coming out of the slide groove 402 when under load. The surface of the sliding block 403 near the hydraulic drive rod 2 is provided with a movable groove 406. A connecting rod 409 is rotatably connected to the movable groove 406 by a pin. The end of the connecting rod 409 away from the movable groove 406 is rotatably connected to the corresponding position of the connecting shaft 408 by a pin. The four sets of connecting rods 409 are evenly arranged around the circumference of the connecting shaft 408 to ensure synchronous transmission.

[0038] A hinge seat 404 is welded and fixed to the bottom of the sliding block 403. A limit rod 4010 is fixedly connected between the two side walls of the hinge seat 404. A support rod 405 is provided below the hinge seat 404 through the limit rod 4010. The support rod 405 has a matching strip groove 4011 at the position corresponding to the limit rod 4010. The length direction of the strip groove 4011 is consistent with the length direction of the support rod 405. The support rod 405 is slidably hinged to the hinge seat 404 through the strip groove 4011 and the limit rod 4010. The bottom end of the support rod 405 is rotatably connected to the inner cavity of the connecting arm 401 near the bottom through a fixed shaft 407. The two ends of the fixed shaft 407 are fixedly connected to the inner wall of the connecting arm 401 to ensure that the support rod 405 can only rotate around the axis of the fixed shaft 407.

[0039] The rotation of the hydraulic drive rod 2 causes the connecting shaft 408 to drive the connecting rod 409 to rotate and move, thereby causing the connecting rod 409 to drive the sliding block 403 to slide on the slide groove 402. The sliding of the sliding block 403 causes the support rod 405 to slide and move on the hinge seat 404 through the limiting rod 4010 and the strip groove 4011, thereby causing the support rod 405 to rotate on the fixed shaft 407. The rotation of the support rod 405 causes the arc gear 501 to rotate, thereby cooperating with the positioning and clamping mechanism 5 to achieve the clamping work of the propeller. It can clamp the propeller from all sides, thereby improving the stability of the propeller after clamping, ensuring its stability during the processing, and thus improving the processing efficiency.

[0040] As can be seen from the above working process, by using the clamping and disassembly mechanism 4 in conjunction with the positioning and clamping mechanism 5, the propeller can be stably clamped around its perimeter during the processing of the propeller clamping mechanism, while maintaining a high degree of fit, thereby further improving the stability of the processing and thus improving the processing efficiency.

[0041] Further as Figure 2 , Figure 3 and Figure 4 As shown, it is worth noting that the positioning and clamping mechanism 5 is correspondingly installed at the lower part of each connecting arm 401. The positioning and clamping mechanism 5 includes an arc gear 501, which is integrally formed on the outer surface of the bottom end of the support rod 405 away from the hinge seat 404. The center of the pitch circle of the arc gear 501 coincides with the axis of the fixed shaft 407, ensuring that the transmission of the arc gear 501 remains stably engaged when the support rod 405 rotates, without jamming or skipping teeth. The lower part of the arc gear 501 is equipped with a rack 502. The lower part of the inner cavity of the connecting arm 401 is provided with a matching limiting groove 503 corresponding to the position of the rack 502. The limiting groove 503 is a rectangular guide groove, and its length direction is consistent with the radial direction of the mounting base 1. The upper and lower end faces of the rack 502 are clearance-fitted with the upper and lower inner walls of the limiting groove 503, so that the rack 502 can only make linear reciprocating motion along the radial direction of the mounting base 1, avoiding circumferential deflection and ensuring the accuracy of centering clamping.

[0042] An arc-shaped clamping plate 504 is detachably and fixedly connected to the inner end of the rack 502 facing the center of the mounting base 1 via countersunk bolts. The arc-shaped clamping plate 504 is made of flexible elastic material, preferably polyurethane rubber or nitrile rubber with a Shore hardness of 60-80HA. The inner clamping surface of the arc-shaped clamping plate 504 is provided with anti-slip grid texture, which can adapt to the outer curvature of propeller hubs of different diameters through its own elastic deformation, improve the clamping fit, and greatly increase the clamping friction to prevent slippage during pull-out operations. The arc-shaped clamping plate 504 adopts a detachable connection structure, which can be quickly replaced after wear, making maintenance convenient. A limit plate 505 is fixedly connected to the outer end of the rack 502 away from the center of the mounting base 1 to limit the maximum feed stroke of the rack 502 and prevent the rack 502 from coming out of the limit groove 503.

[0043] The rotation of the support rod 405 in the clamping and disassembly mechanism 4 causes the arc gear 501 to rotate, which in turn causes the rack 502 to slide within the limiting groove 503. This allows the arc clamping plate 504 to clamp the propeller. Furthermore, the elastic deformation of the arc clamping plate 504 further improves the fit with the propeller surface, thereby enhancing the clamping stability and ensuring stable processing. This also guarantees processing efficiency. Moreover, the sliding of the rack 502 allows the arc clamping plate 504 to clamp propellers of different specifications, thus improving the practicality of the device.

[0044] The solution has the following working process: When this device is in use, the top of the hydraulic drive rod 2 is connected to the external hydraulic drive device to facilitate the driving of the device. The entire device is hoisted to the hub position of the propeller to be disassembled. The attitude of the device is adjusted so that the center of the mounting base 1 is coaxially aligned with the axis of the propeller and stern shaft.

[0045] When the hydraulic drive rod 2 rotates, it drives the connecting shaft 408 at the bottom to rotate synchronously. The connecting shaft 408, through four sets of circumferentially distributed connecting rods 409, synchronously pushes the corresponding sliding block 403 to slide along the sliding groove 402 of the connecting arm 401 in a direction away from the center of the mounting base 1. When the sliding block 403 slides, through the hinge seat 404 at the bottom and the limiting rod 4010, it drives the support rod 405 to rotate around the fixed shaft 407 in a direction closer to the center of the mounting base 1. When the support rod 405 rotates, the arc gear 501 at its bottom rotates synchronously, thereby meshing with the drive rack 502 to make radial linear motion along the limiting groove 503 towards the center of the mounting base 1. Finally, through the four sets of arc clamping plates 504, it is synchronously and centeredly clamped on the outer circumferential surface of the propeller hub. By controlling the rotation amount of the hydraulic drive rod 2, the clamping diameter of the arc clamping plate 504 can be adjusted to adapt to different specifications of propeller hubs until the arc clamping plate 504 is completely in contact with the surface of the propeller hub, achieving the set clamping force.

[0046] After clamping and positioning are completed, high-pressure hydraulic oil is injected into the mating surfaces of the propeller and the stern shaft to form an oil film and achieve separation. At the same time, an axial pulling force is applied to the propeller by an external hydraulic pulling device. With the stable clamping of this device, the propeller is smoothly pulled out from the stern shaft to complete the disassembly operation. During the disassembly process, the four sets of evenly distributed clamping forces are always kept in alignment to avoid uneven load and ensure a smooth and unobstructed disassembly process.

[0047] Please see Figure 6 This invention provides a method for hydraulically disassembling and centering a large container ship propeller, comprising the following steps:

[0048] S1: Connect the hydraulic drive rod 2 of the hydraulic disassembly tool to the external hydraulic drive device to complete the hoisting and positioning of the tool, so that the center of the tool mounting seat 1 is initially aligned with the axial center of the propeller hub to be disassembled.

[0049] S2: Adjust the spatial posture of the tool so that the axial center line of the mounting base 1 is coaxial with the axis of the ship's stern shaft, and at the same time, make the arc-shaped clamping plates 504 of each set of positioning clamping mechanisms 5 maintain a uniform radial clearance with the outer circumferential surface of the propeller hub.

[0050] S3: Start the external hydraulic drive device, drive the hydraulic drive rod 2 to rotate, and drive the corresponding positioning clamping mechanism 5 to make a centering synchronous feed along the radial direction of the mounting base 1 through the synchronous linkage of the circumferentially distributed clamping and disassembly mechanisms 4, so that each set of arc-shaped clamping plates 504 moves towards the outer circumferential surface of the propeller hub synchronously.

[0051] S4: Continuously control the rotation of the hydraulic drive rod 2 until the inner clamping surfaces of each set of arc-shaped clamping plates 504 are completely in contact with the outer circumferential surface of the propeller hub. The surface contact clamping is achieved through the elastic deformation of the flexible arc-shaped clamping plates 504, keeping the clamping force of each set uniform and consistent, so that the clamping center of the tool, the axis of the propeller and the axis of the stern shaft are completely coaxial and coincident, thus completing the centering and locking.

[0052] S5: Inject high-pressure hydraulic oil into the mating surfaces of the propeller and the stern shaft to form a lubricating oil film and achieve static separation. At the same time, apply an axial pulling force coaxial with the stern shaft to the propeller through an external hydraulic pulling device. With the stable clamping of the disassembly tool, the propeller is pulled out smoothly along the stern shaft axis.

[0053] S6: After the propeller is completely disassembled, first release the axial pulling force and discharge the high-pressure hydraulic oil from the mating surface, then control the hydraulic drive rod 2 to feed axially in the opposite direction, and drive the positioning clamping mechanism 5 to synchronously and radially reset through the clamping disassembly mechanism 4, loosening the clamping on the propeller hub and completing the entire disassembly and centering operation.

[0054] Furthermore, in this embodiment, for large container ship propeller hubs of different diameters, the clamping diameter of the arc-shaped clamping plate 504 of the positioning clamping mechanism 5 can be adjusted simply by controlling the axial feed of the hydraulic drive rod 2, thereby achieving stepless adjustment of the clamping diameter. The applicable range covers large container ship propeller hubs with diameters of 800mm to 2500mm. No clamping components need to be replaced, which greatly reduces the preparation time before operation and improves the efficiency of disassembly operation.

[0055] Meanwhile, throughout the entire alignment and disassembly process, a single hydraulic drive source synchronously drives multiple sets of clamping and disassembly mechanisms 4 and positioning clamping mechanisms 5, simultaneously completing the clamping, alignment, and release actions of multiple sets of clamping components. There is no need to adjust each set of clamping components step by step, the operation process is standardized, and the operation difficulty of operators is greatly reduced. The closed-loop alignment clamping throughout the process fundamentally avoids the problem of off-center load during the pulling process, effectively preventing scratches and deformation of the propeller cone hole and stern shaft mating surface. It is fully adaptable to the complex working conditions of shipyards and ensures the safety, accuracy, and stability of propeller disassembly operations on large container ships.

[0056] In summary: By synchronously driving multiple clamping and disassembly mechanisms 4 and positioning clamping mechanisms 5 with a single hydraulic drive source, the propeller is synchronously clamped in a centering manner, which solves the problems of poor centering, unstable clamping and weak adaptability of the existing technology. The overall structure is compact and easy to operate, and can efficiently and safely complete the disassembly of propellers of large container ships, fully meeting the working conditions of the shipbuilding and repair industry.

[0057] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0058] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydraulic dismantling tool for large container ship propellers, including a mounting base (1), characterized in that: A bearing (3) is fixedly embedded in the center of the mounting base (1). The inner ring of the bearing (3) is interference-fitted with a hydraulic drive rod (2) that axially penetrates the mounting base (1). At least three sets of clamping and disassembly mechanisms (4) are evenly distributed around the outer periphery of the mounting base (1). The power input end of each set of clamping and disassembly mechanisms (4) is linked to the lower end of the hydraulic drive rod (2). The output end of each set of clamping and disassembly mechanisms (4) is connected to a set of positioning and clamping mechanisms (5). When the hydraulic drive rod (2) is axially fed, the corresponding positioning and clamping mechanisms (5) are synchronously driven by each set of clamping and disassembly mechanisms (4) to perform a concentric synchronous clamping action along the radial direction of the mounting base (1).

2. The hydraulic dismantling tool for large container ship propellers according to claim 1, characterized in that: The clamping and disassembly mechanism (4) includes a connecting arm (401), which is fixedly connected to the surface of the mounting base (1). A sliding groove (402) is provided in the connecting arm (401) near the upper part. A sliding block (403) is slidably arranged in the sliding groove (402). A movable groove (406) is provided on the surface of the sliding block (403) near the hydraulic drive rod (2). A connecting rod (409) is rotatably connected in the movable groove (406). A connecting shaft (408) is rotatably connected to the end of the connecting rod (409) away from the movable groove (406). The top end of the connecting shaft (408) is fixed to the bottom of the hydraulic drive rod (2). The sliding block (403) is fixedly connected to a hinge seat (404) at its bottom. A limit rod (4010) is fixedly connected to the hinge seat (404). A support rod (405) is provided below the hinge seat (404) through the limit rod (4010). A matching strip groove (4011) is provided on the support rod (405) corresponding to the limit rod (4010). The support rod (405) is slidably mounted on the hinge seat (404) through the strip groove (4011) and the limit rod (4010). A fixed shaft (407) is rotatably connected to the bottom of the support rod (405) and fixedly connected to the connecting arm (401) near the bottom.

3. The hydraulic dismantling tool for large container ship propellers according to claim 2, characterized in that: Four connecting arms (401) are provided, and the four connecting arms (401) are evenly connected to the outer surface of the mounting base (1).

4. The hydraulic dismantling tool for large container ship propellers according to claim 2, characterized in that: The positioning and clamping mechanism (5) is located on the lower part of the mounting base (1) via a connecting arm (401).

5. The hydraulic dismantling tool for large container ship propellers according to claim 1, characterized in that: The positioning and clamping mechanism (5) includes an arc gear (501), which is fixedly installed on the outer surface of one end of the bottom of the support rod (405). A rack (502) is meshed on the lower part of the arc gear (501). A matching limiting groove (503) is opened in the connecting arm (401) of the rack (502). An arc clamping plate (504) is fixedly connected to one end of the inner side of the rack (502), and a limiting plate (505) is fixedly connected to one end of the outer side of the rack (502).

6. The hydraulic disassembly tool for large container ship propellers according to claim 5, characterized in that: The rack (502) is slidably disposed in the connecting arm (401) through the limiting groove (503).

7. The hydraulic dismantling tool for large container ship propellers according to claim 5, characterized in that: The arc-shaped clamp (504) is made of flexible material, is arc-shaped and has elastic deformation.

8. A method for hydraulically disassembling and aligning the propeller of a large container ship, characterized in that: The implementation of the hydraulic dismantling tool for large container ship propellers according to any one of claims 1-7 includes the following steps: S1: Connect the hydraulic drive rod (2) of the hydraulic disassembly tool to the external hydraulic drive device to complete the hoisting and positioning of the tool, so that the center of the tool mounting base (1) is initially aligned with the axial center of the propeller hub to be disassembled. S2: Adjust the spatial posture of the tool so that the axial center line of the mounting base (1) is coaxial with the axis of the ship's stern shaft, and at the same time, make the arc-shaped clamps (504) of each set of positioning clamping mechanisms (5) maintain a uniform radial gap with the outer circumferential surface of the propeller hub. S3: Start the external hydraulic drive device, drive the hydraulic drive rod (2) to rotate, and drive the corresponding positioning clamping mechanism (5) to make a centering synchronous feed along the radial direction of the mounting base (1) through the synchronous linkage of the clamping and disassembly mechanisms (4) evenly distributed in the circumferential direction, so that the arc-shaped clamps (504) move towards the outer circumferential surface of the propeller hub in a synchronous manner. S4: Continuously control the rotation of the hydraulic drive rod (2) until the inner clamping surface of each set of arc-shaped clamps (504) is completely in contact with the outer peripheral surface of the propeller hub. The surface contact clamping is achieved through the elastic deformation of the flexible arc-shaped clamps (504), keeping the clamping force of each set uniform and consistent, so that the clamping center of the tool, the axis of the propeller and the axis of the stern shaft are completely coaxially coincident, and the centering and locking are completed. S5: Inject high-pressure hydraulic oil into the mating surfaces of the propeller and the stern shaft to form a lubricating oil film and achieve static separation. At the same time, apply an axial pulling force coaxial with the stern shaft to the propeller through an external hydraulic pulling device. With the stable clamping of the disassembly tool, the propeller is pulled out smoothly along the stern shaft axis. S6: After the propeller is completely disassembled, first release the axial pulling force and discharge the high-pressure hydraulic oil from the mating surface, then control the hydraulic drive rod (2) to feed in the opposite axial direction, and drive the positioning clamping mechanism (5) to synchronously radially reset through the clamping disassembly mechanism (4), loosen the clamping of the propeller hub, and complete the entire disassembly and centering operation.

9. The method for hydraulic disassembly and alignment of a large container ship propeller according to claim 8, characterized in that: In step S3, the synchronous centering clamping and step S4, the axial feed of the hydraulic drive rod (2) is controlled to achieve stepless adjustment of the clamping diameter, which can be adapted to propeller hubs of different diameters. During the clamping process, at least three sets of clamping and disassembly mechanisms (4) and positioning clamping mechanism (5) are evenly distributed in the circumference to act synchronously, so that the coaxiality deviation between the clamping center and the stern shaft axis is not greater than 0.05mm throughout the process.

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