Ship tail shaft structure

Abstract

The utility model belongs to a ship tail shaft structure in the technical field of ship parts. A rear mechanical sealing assembly (102) and a propeller (103) are arranged at one end of a stern shaft body (101) of the stern shaft assembly, a front bearing (203) is arranged in one end of a stern tube body (201) of the stern tube assembly, a rear bearing (204) is arranged in the other end of the stern tube body (201), and a guide ring (202) with a horn mouth is arranged at one end of the stern tube body (201). The ship tail shaft structure is simple in structure and capable of conveniently and reliably achieving assembly, reducing assembly difficulty, improving assembly efficiency, preventing the paddles from being collided and damaged and meeting actual requirements.

Description

Technical Field

[0001] This utility model belongs to the field of ship component technology, and more specifically, relates to a ship stern shaft structure. Background Technology

[0002] Traditional stern shaft installation employs a split assembly process, where the propeller is installed after the stern shaft is inserted into the tailpipe. Due to limitations of the on-site working environment, this method has many insurmountable drawbacks: high labor intensity, poor installation quality, and low production efficiency, failing to effectively meet actual needs.

[0003] Existing technology includes a device called "Ship Sternshaft Assembly" with publication number "CN104002954B". This technology discloses a ship sternshaft assembly, comprising a stern tube, a propeller shaft, a front bearing, a rear bearing, seals, and fasteners. The seals include a sealing sleeve, a skeleton-type sealing ring, and a sealing gland. The fasteners include anti-loosening bolts, propeller fastening nuts, coupling fastening nuts, hex socket screws, and set screws. The front bearing, propeller shaft, and rear bearing are connected sequentially, with one end of each bearing fitted inside the stern tube. The device is characterized by further including ball bearings mounted on the front and rear bearings. A front bearing housing is installed outside the ball bearing on the front bearing, and a stern shaft hub is installed outside the ball bearing on the rear bearing. The front bearing housing and stern shaft hub are connected to the stern tube. This ship sternshaft assembly features high mechanical efficiency, good rotational performance, wear resistance, ease of processing, and long service life.

[0004] However, this technology does not address the technical issues and solutions of this application. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a ship stern shaft structure that is simple in structure, can be easily and reliably assembled, reduces assembly difficulty, improves assembly efficiency, avoids blade collision damage, and meets actual needs, in order to address the shortcomings of the existing technology.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] This utility model relates to a ship stern shaft structure. The stern shaft assembly has a rear mechanical seal assembly and a propeller at one end of the stern shaft body. The stern tube assembly has a front bearing inside one end of the stern tube body and a rear bearing inside the other end of the stern tube body. A flared guide ring is provided at one end of the stern tube body.

[0008] The stern tube assembly has a front sleeve at one end of the stern tube body and a rear sleeve at the other end. A front bearing is fixedly installed inside the front sleeve, and a rear bearing is fixedly installed inside the rear sleeve.

[0009] The guide ring is fitted with a rear bearing at its small end, and the guide ring is a structure formed by winding a metal plate.

[0010] The front sleeve is fixedly connected to the front mechanical seal assembly at its outer end.

[0011] The ship stern shaft structure also includes assembly components, which include tooling jigs and lifting devices.

[0012] When the stern shaft assembly and stern tube assembly are connected, the tail tube body is fitted onto the outer ring of the stern shaft body, the front sleeve is fixedly connected to the front mechanical seal assembly by bolts, and the rear sleeve is fixedly connected to the rear mechanical seal assembly by bolts.

[0013] The tooling frame has a bearing recess on the upper part of the bearing rod and multiple support legs at the bottom of the bearing rod.

[0014] The lifting device includes a lifting ring and a connecting part. The lifting ring has a U-shaped structure. Each end of the lifting ring passes through the opening of the connecting part. The threaded parts at both ends of the connecting part of each end of the lifting ring are respectively screwed with a nut and a lower nut. The upper part of the connecting part is provided with a lifting hole.

[0015] One end of the stern tube body is welded to the front sleeve, and the other end of the stern tube body is welded to the rear sleeve.

[0016] The working principle and beneficial effects of this utility model are as follows:

[0017] The stern shaft structure of this utility model involves assembling the stern shaft assembly and the stern tube assembly separately, and then assembling the stern shaft assembly and the stern tube assembly together. To adapt to production needs and solve problems in the existing technology, this method changes the traditional shipbuilding model by moving the installation process of the propeller and stern shaft body forward, installing both first, and then hoisting the whole assembly onto a jig. The specific implementation is as follows: Step 1: Workshop pre-assembly: In the workshop, the stern shaft body, aft mechanical seal assembly, and propeller are assembled into a single module, and the stern shaft body is supported by a jig; Step 2: Hull preparation: The front and aft bearings and the front mechanical seal assembly are installed inside the stern tube body, and a guide ring is installed at the rear of the stern tube body before assembly; Step 3: Hoisting assembly. The stern shaft assembly is lifted using a lifting device, tilting its front end upwards. Then, the stern tube assembly is lifted, and the relative posture of the stern shaft and stern tube assemblies is adjusted. With the assistance of a guide ring, the front end of the stern shaft body of the stern shaft assembly is inserted into the stern tube of the stern tube assembly. The guide ring facilitates and reliably aligns and inserts the stern tube and stern shaft assemblies. The guide ring is then removed, and the stern tube and stern shaft assemblies are pushed together to complete their assembly. This effectively reduces the difficulty of component assembly and improves assembly efficiency. Attached Figure Description

[0018] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings therein:

[0019] Figure 1 This is a schematic diagram of the stern shaft assembly of the ship stern shaft structure described in this utility model;

[0020] Figure 2 This is a schematic diagram of the stern tube assembly of the ship stern shaft structure described in this utility model;

[0021] Figure 3 This is a structural schematic diagram of the ship stern shaft structure described in this utility model;

[0022] Figure 4 This is a schematic diagram of the lifting device for the ship stern shaft structure described in this utility model;

[0023] The labels in the attached diagram are as follows: 101, stern shaft body; 102, rear mechanical seal assembly; 103, propeller; 201, stern tube body; 202, guide ring; 203, front bearing; 204, rear bearing; 205, front mechanical seal assembly; 206, front sleeve; 207, rear sleeve; 301, bearing rod; 302, bearing recess; 303, support leg; 401, lifting ring; 402, connecting part; 403, threaded part; 404, upper nut; 405, lower nut; 406, lifting hole. Detailed Implementation

[0024] The following description, with reference to the accompanying drawings, provides a more detailed explanation of the specific embodiments of this utility model, including the shape and structure of each component, the relative positions and connections between the parts, the functions and working principles of each part:

[0025] As attached Figure 1 -Appendix Figure 4As shown, this utility model relates to a ship stern shaft structure. The stern shaft assembly has a rear mechanical seal assembly 102 and a propeller 103 at one end of the stern shaft body 101. The stern tube assembly has a front bearing 203 inside one end of the stern tube body 201, and a rear bearing 204 inside the other end. A flared guide ring 202 is also provided at one end of the stern tube body 201. This structure addresses the shortcomings of existing technologies by proposing an improved technical solution. In this structural design, the stern shaft assembly and the stern tube assembly are assembled separately, and then the stern shaft assembly and the stern tube assembly are assembled together. To meet production needs and solve problems in existing technologies, this invention changes the traditional shipbuilding method by moving the installation process of the propeller 103 and the stern shaft body 101 forward, replacing it with the initial installation of both, followed by hoisting the entire assembly onto a tooling jig. The specific implementation is as follows: Step 1: Pre-assembly in the workshop: The stern shaft body 101, the aft mechanical seal assembly 102, and the propeller 103 are assembled into an integral module in the workshop, and the stern shaft body 101 is lifted by a tooling jig; Step 2: Hull preparation: The front bearing 203 and the aft bearing 204, and the front mechanical seal assembly 205 are installed inside the stern tube body 201. Before assembly, the guide ring 202 is installed at the rear of the stern tube body 201. Step 3: Lifting and assembly. The stern shaft assembly is lifted using a lifting device, tilting its front end (the end without the propeller 103) upwards. Then, the stern tube assembly is lifted, and the relative attitudes of the stern shaft and stern tube assemblies are adjusted. With the assistance of the guide ring 202, the front end of the stern shaft body of the stern shaft assembly is inserted into the stern tube of the stern tube assembly. The guide ring 202 facilitates and reliably aligns and inserts the stern tube and stern shaft assemblies. The guide ring 202 is then removed, and the stern tube and stern shaft assemblies are pushed together to complete their assembly. This effectively reduces the difficulty of component assembly and improves assembly efficiency. The ship stern shaft structure described in this invention is simple in structure, allows for convenient and reliable assembly, reduces assembly difficulty, improves assembly efficiency, avoids blade collision damage, and meets practical needs.

[0026] The stern tube assembly comprises a stern tube body 201 with a front sleeve 206 at one end and a rear sleeve 207 at the other end. A front bearing 203 is fixedly installed inside the front sleeve 206, and a rear bearing 204 is fixedly installed inside the rear sleeve 207. One end of the stern tube body 201 is welded to the front sleeve 206, and the other end is welded to the rear sleeve 207. In this structure, the front sleeve 206 and the rear sleeve 207 are integral parts of the stern tube assembly and are reliably connected by welding.

[0027] The guide ring 202 is fitted with the rear bearing 204 at its small end. The guide ring 202 is a structure formed by winding a metal plate. In this structure, the guide ring is wound into a trumpet-shaped structure, which reliably guides the head of the stern shaft assembly and stern tube assembly during installation, improving efficiency.

[0028] The front sleeve 206 is fixedly connected to the front mechanical seal assembly 205 at its outer end.

[0029] The aforementioned stern shaft structure also includes assembly components, including a tooling jig and a lifting device. When the stern shaft assembly and stern tube assembly are connected, the stern tube body 201 is fitted onto the outer ring of the stern shaft body 101. The front sleeve 206 is bolted to the front mechanical seal assembly 205, and the rear sleeve 207 is bolted to the rear mechanical seal assembly 102. The tooling jig has a bearing recess 302 on its upper part and multiple support legs 303 at its bottom. With this structure, the tooling jig supports the stern shaft assembly, keeping the propeller 103 suspended in the air, preventing it from falling to the ground and being damaged or bent due to impact, thus reliably protecting it.

[0030] The lifting device includes a lifting ring 401 and a connecting part 402. The lifting ring 401 has a U-shaped structure, with each end of the lifting ring 401 passing through an opening in the connecting part 402. A nut 404 and a lower nut 405 are screwed onto the threaded portions 403 at both ends of the connecting part 402 at each end of the lifting ring 401. A lifting hole 406 is provided on the upper part of the connecting part 402. With this structure, the lifting device is used to lift the stern shaft assembly and the stern tube assembly. Separate lifting devices are used for lifting the stern shaft assembly and the stern tube assembly. Depending on the diameter of the stern shaft assembly and the stern tube assembly, the upper and lower nuts can be adjusted to reliably fix the stern shaft assembly and the stern tube assembly, preventing the lifting device from shifting relative to the components during lifting and ensuring the stability of the lifting and installation.

[0031] The stern shaft structure of this utility model involves assembling the stern shaft assembly and the stern tube assembly separately, and then assembling the stern shaft assembly and the stern tube assembly together. To adapt to production needs and solve problems in the existing technology, this invention changes the traditional shipbuilding model by moving the installation process of the propeller 103 and the stern shaft body 101 forward. Instead, both are installed first, and then the entire assembly is hoisted onto a jig. The specific implementation is as follows: Step 1: Workshop pre-assembly: In the workshop, the stern shaft body 101, the aft mechanical seal assembly 102, and the propeller 103 are assembled into a single module, and the stern shaft body 101 is supported by a jig; Step 2: Hull preparation: The front bearing 203 and the aft bearing 204, and the front mechanical seal assembly 205 are installed inside the stern tube body 201. Before assembly, a guide ring 202 is installed at the rear of the stern tube body 201; Step 3: Hoisting assembly. The stern shaft assembly is lifted using a lifting device, tilting its front end (the end without propeller 103) upwards. Then, the stern tube assembly is lifted, and the relative attitudes of the stern shaft and stern tube assemblies are adjusted. With the assistance of guide ring 202, the front end of the stern shaft body of the stern shaft assembly is inserted into the stern tube of the stern tube assembly. Guide ring 202 facilitates and reliably aligns and inserts the stern tube and stern shaft assemblies. Then, guide ring 202 is removed, and the stern tube and stern shaft assemblies are pushed forward, allowing them to move directionally and completing the assembly. This effectively reduces the difficulty of component assembly and significantly improves assembly efficiency.

[0032] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A ship stern shaft structure, characterized in that: The stern shaft assembly has a rear mechanical seal assembly (102) and a propeller (103) at one end of the stern shaft body (101), the stern tube assembly has a front bearing (203) inside one end of the stern tube body (201), a rear bearing (204) inside the other end of the stern tube body (201), and a bell-shaped guide ring (202) at one end of the stern tube body (201).

2. The ship stern shaft structure according to claim 1, characterized in that: The stern tube assembly has a front sleeve (206) at one end of the stern tube body (201) and a rear sleeve (207) at the other end. A front bearing (203) is fixedly installed in the front sleeve (206) and a rear bearing (204) is fixedly installed in the rear sleeve (207).

3. The ship stern shaft structure according to claim 1 or 2, characterized in that: The guide ring (202) is connected to the bearing (204) at its small end. The guide ring (202) is a structure formed by winding metal plates.

4. The ship stern shaft structure according to claim 2, characterized in that: The front sleeve (206) is fixedly connected to the front mechanical seal assembly (205) at its outer end.

5. The ship stern shaft structure according to claim 1 or 2, characterized in that: The ship stern shaft structure also includes assembly components, which include tooling jigs and lifting devices.

6. The ship stern shaft structure according to claim 2, characterized in that: When the stern shaft assembly and the stern tube assembly are connected, the tail tube body (201) is fitted on the outer ring of the stern shaft body (101), the front sleeve (206) is fixedly connected to the front mechanical seal assembly (205) by bolts, and the rear sleeve (207) is fixedly connected to the rear mechanical seal assembly (102) by bolts.

7. The ship stern shaft structure according to claim 5, characterized in that: The upper part of the bearing rod (301) of the tooling frame is provided with a bearing recess (302), and the bottom of the bearing rod (301) is provided with multiple support legs (303).

8. The ship stern shaft structure according to claim 5, characterized in that: The lifting device includes a lifting ring (401) and a connecting part (402). The lifting ring (401) has a U-shaped structure. Each end of the lifting ring (401) passes through the opening of the connecting part (402). The threaded parts (403) at both ends of the connecting part (402) of each end of the lifting ring (401) are screwed with nuts (404) and lower nuts (405). The upper part of the connecting part (402) is provided with a lifting hole (406).

9. The ship stern shaft structure according to claim 2, characterized in that: One end of the stern tube body (201) is welded to the front sleeve (206), and the other end of the stern tube body (201) is welded to the rear sleeve (207).

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