Auxiliary system for ship propeller shaft to penetrate through stern tube

Abstract

The utility model relates to an auxiliary system for a ship propeller shaft to penetrate through a stern tube, which comprises a propeller shaft assembly and a hoisting conveying system, and the propeller shaft assembly comprises a propeller shaft, a threaded dummy shaft, an extension rod and a flange dummy shaft, the hoisting conveying system comprises a monorail hoisting beam trolley, a first hoisting hook, a second hoisting hook, a first pneumatic hoist, a second pneumatic hoist, a third pneumatic hoist, a fourth pneumatic hoist, a fifth pneumatic hoist and a sixth pneumatic hoist; a threaded dummy shaft is arranged at the rear end of the propeller shaft, and an extension bar is arranged in the threaded dummy shaft; the threaded dummy shaft is connected with a propeller shaft through a threaded connector, the threaded dummy shaft is connected with an extension rod in a sleeved mode through a connecting pipe, and the extension rod is arranged in the connecting pipe. In the whole process that the propeller shaft penetrates through the stern tube, the propeller shaft does not make contact with the sealing tube support in the stern tube, and it is ensured that the propeller shaft is intact.

Description

Technical Field

[0001] The utility model relates to the technical field of ship design and construction, in particular to an auxiliary system for passing a ship propeller shaft through a stern tube. Background Art

[0002] At present, the size of ships being built is getting bigger and bigger, the power units are getting bigger and bigger, and the diameter and length of their propeller shafts are getting bigger and bigger; and the weight of the propeller shafts has also greatly increased, reaching 50 to 100 tons; this has brought great difficulty to the installation of the propeller shaft.

[0003] The support bearings of a ship's propeller shaft are located within a closed stern tube. While the stern tube lubricant lubricates the bearings with an oil film, it also fills the gap between the stern shaft and the stern tube, providing sufficient cooling. While this facilitates lubrication and cooling, it also limits the space available for the sling on the stern shaft to operate during the insertion of the stern shaft into the stern tube. In particular, the shaft portion already inside the stern tube cannot provide leverage, making it difficult to control the balance of the stern shaft. During the actual insertion of the stern tube, the stern shaft is often scratched by the pipe support within the stern tube. If the scratches occur at the bearing stop, these scratches will create a "filing" effect at low speeds when the shaft is in operation, during the start / stop of the main engine, when no oil film has formed. This scratching will scrape the babbitt metal on the bearing surface, causing a high bearing temperature alarm and even bearing wear, resulting in significant economic losses when the ship is docked for bearing replacement. Therefore, the present applicant proposes an auxiliary system for ship propeller shaft insertion into the stern tube. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a ship propeller shaft passing through the stern tube auxiliary system, which solves the leverage point and balance problems during the propeller shaft insertion process, thereby avoiding the economic loss of bearing replacement.

[0005] The purpose of this utility model is achieved in this way:

[0006] A ship propeller shaft threading auxiliary system includes a propeller shaft assembly and a hoisting and conveying system. The propeller shaft assembly includes a propeller shaft, a threaded dummy shaft, an extension rod, and a flanged dummy shaft. The hoisting and conveying system includes a monorail beam trolley, a first hook, a second hook, a No. 1 pneumatic hoist, a No. 2 pneumatic hoist, a No. 3 pneumatic hoist, a No. 4 pneumatic hoist, a No. 5 pneumatic hoist, and a No. 6 pneumatic hoist.

[0007] A threaded dummy shaft is provided at the rear end of the propeller shaft, and an extension rod is provided in the threaded dummy shaft; the threaded dummy shaft is connected to the propeller shaft via a threaded connector, and the threaded dummy shaft is sleeved with the extension rod via a connecting pipe, and the extension rod is provided in the connecting pipe;

[0008] The No. 1 pneumatic hoist, No. 2 pneumatic hoist and No. 3 pneumatic hoist are installed at the cabin lifting port, and the No. 1 pneumatic hoist, No. 2 pneumatic hoist and No. 3 pneumatic hoist are arranged side by side;

[0009] There is a hull structure on the inner wall of the cabin, which is close to the entrance of the stern tube. A monorail beam trolley is provided above the inner wall of the cabin. The monorail beam trolley is arranged between the cabin lifting port and the entrance of the stern tube. The monorail beam trolley is provided with a first hook and a second hook; a No. 4 pneumatic hoist, a No. 5 pneumatic hoist and a No. 6 pneumatic hoist are also provided on the inner wall of the cabin, and the No. 4 pneumatic hoist is arranged between the hull structure and the entrance end of the stern tube.

[0010] Furthermore, the No. 5 pneumatic hoist and the No. 6 pneumatic hoist are arranged above the rear side of the outlet end of the stern tube, the No. 5 pneumatic hoist is arranged above the outlet end of the stern tube, and the No. 6 pneumatic hoist is arranged at the corner of the cabin behind the No. 5 pneumatic hoist.

[0011] Furthermore, the threaded pseudo-shaft includes a threaded connector and a connecting pipe, the internal thread of the threaded connector matches the rear end thread of the propeller shaft, the threaded connector is sleeved on the rear end of the propeller shaft, and one end of the threaded connector is connected to the connecting pipe.

[0012] Furthermore, the inner wall of the connecting pipe is provided with a circle of limit blocks arranged along the circumference, and the limit blocks are arranged close to the threaded connector.

[0013] Furthermore, the outer wall of the connecting pipe is provided with two symmetrical reinforcing plates, and the front end surfaces of the reinforcing plates are fixed on the outer wall of the threaded connector.

[0014] Furthermore, the outer wall of the connecting pipe is provided with at least one reinforcement ring, and the reinforcement ring is arranged at the rear section of the connecting pipe.

[0015] Furthermore, the extension rod includes an extension tube, and the front end surface of the extension tube is provided with a sealing plate.

[0016] Furthermore, the sealing plate is provided with an ear plate, which is used to connect with the rear end face of the propeller shaft.

[0017] Furthermore, the flange dummy shaft includes a flange and a short pipe, one end of the short pipe is sleeved with a flange, and the flange matches the front end of the propeller shaft.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The utility model provides an auxiliary system for passing a propeller shaft through a stern tube of a ship. A threaded dummy shaft and an extension rod are arranged at the rear end of the propeller shaft. A hoisting and conveying system is arranged in the engine room for cooperation. Two hooks are provided on a lifting beam trolley, one for up and down lifting and the other for front and back translation. The hoisting and conveying system cooperates at each node to position the propeller shaft and the stern tube in concentric circles. During the entire process of the propeller shaft passing through the stern tube, the propeller shaft does not have any contact with the sealing pipe bracket (screw) in the stern tube, thereby ensuring that the propeller shaft itself is intact and economic losses are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the propeller shaft assembly of the present invention.

[0021] Figure 2 It is a cross-sectional view of the threaded false shaft of the present utility model.

[0022] Figure 3 It is a cross-sectional view of the extension rod of the present invention.

[0023] Figure 4 It is a cross-sectional view of the flange pseudo-shaft of the present invention.

[0024] Figure 5 This is a schematic diagram of entering the cabin in step four of the present invention.

[0025] Figure 6 This is a schematic diagram of entering the cabin in step five of the present invention.

[0026] Figure 7 This is a schematic diagram of entering the cabin in step six of the present invention.

[0027] Figure 8 This is a schematic diagram of entering the cabin in step seven of the present invention.

[0028] Figure 9 This is a schematic diagram of entering the cabin in step eight of the present invention.

[0029] Figure 10 This is a schematic diagram of entering the cabin in step ten of the present invention.

[0030] Figure 11 This is a schematic diagram of entering the cabin in step 11 of the present invention.

[0031] Figure 12 This is a schematic diagram of cabin entry in step 12 of the present invention.

[0032] Figure 13 This is a schematic diagram of the inclined shaft system of the present invention.

[0033] Figure 14 This is a schematic diagram of the limited space directly above the propeller shaft of the present invention.

[0034] Figure 15 This is a schematic diagram of the hull structure obstacle of the present utility model.

[0035] in:

[0036] Propeller shaft 1, threaded dummy shaft 2, threaded connector 2.1, connecting pipe 2.2, limit block 2.3, reinforcement plate 2.4, reinforcement ring 2.5, extension rod 3, extension pipe 3.1, sealing plate 3.2, ear plate 3.3, flanged dummy shaft 4, flange 4.1, short pipe 4.2, triangular bracket 4.3, stern tube 5, monorail lifting beam trolley 6, first hook 7, second hook 8, No. 1 pneumatic hoist 9, No. 2 pneumatic hoist 10, No. 3 pneumatic hoist 11, No. 4 pneumatic hoist 12, No. 5 pneumatic hoist 13, No. 6 pneumatic hoist 14. DETAILED DESCRIPTION

[0037] To better understand the technical solution of the present invention, the following detailed description is provided with reference to the relevant illustrations. It should be understood that the following specific embodiments are not intended to limit the specific implementation of the technical solution of the present invention; they are merely examples of possible implementations of the technical solution of the present invention. It should be noted that the description herein of the positional relationships of the various components, such as component A being located above component B, is based on the relative positions of the components in the illustrations and is not intended to limit the actual positional relationships of the components. Example 1

[0038] See also Figures 1-15 , Figure 1 Draw a structural schematic diagram of the propeller shaft assembly of the present invention. As shown in the figure, the present invention provides a ship propeller shaft stern tube insertion auxiliary system, including a propeller shaft assembly and a hoisting and conveying system. The propeller shaft assembly includes a propeller shaft 1, a threaded dummy shaft 2, an extension rod 3, and a flanged dummy shaft 4. The hoisting and conveying system includes a monorail beam trolley 6, a first hook 7, a second hook 8, a No. 1 pneumatic hoist 9, a No. 2 pneumatic hoist 10, a No. 3 pneumatic hoist 11, a No. 4 pneumatic hoist 12, a No. 5 pneumatic hoist 13, and a No. 6 pneumatic hoist 14.

[0039] A threaded dummy shaft 2 is provided at the rear end of the propeller shaft 1, and an extension rod 3 is provided inside the threaded dummy shaft 2;

[0040] The threaded dummy shaft 2 includes a threaded connector 2.1 and a connecting tube 2.2. The internal thread of the threaded connector 2.1 matches the rear end thread of the propeller shaft 1. The threaded connector 2.1 is sleeved on the rear end of the propeller shaft 1. One end of the threaded connector 2.1 is connected to the connecting tube 2.2. The outer diameter of the connecting tube 2.2 is smaller than the inner diameter of the threaded connector 2.1.

[0041] The inner wall of the connecting tube 2.2 is provided with a circle of limit blocks 2.3 arranged along the circumference, and the limit blocks 2.3 are arranged close to the threaded connector 2.1; the outer wall of the connecting tube 2.2 is provided with two symmetrical reinforcement plates 2.4, and the front end surfaces of the reinforcement plates 2.4 are fixed to the outer wall of the threaded connector 2.1; the outer wall of the connecting tube 2.2 is provided with at least one circle of reinforcement ring 2.5, and the reinforcement ring 2.5 is arranged at the rear section of the connecting tube 2.2.

[0042] The threaded dummy shaft 2 is connected to the propeller shaft 1 through a threaded connector 2.1. The threaded dummy shaft 2 is sleeved with an extension rod 3 through a connecting tube 2.2. The extension rod 3 is arranged in the connecting tube 2.2.

[0043] The extension rod 3 includes an extension tube 3.1, the length of which is not less than half the inner length of the stern tube 5; the front end face of the extension tube 3.1 is provided with a sealing plate 3.2, and the sealing plate 3.2 is provided with an ear plate 3.3, and the ear plate 3.3 is used to connect with the rear end face of the propeller shaft 1.

[0044] The flange dummy shaft 4 includes a flange 4.1 and a short pipe 4.2. One end of the short pipe 4.2 is sleeved with a flange 4.1, which matches the front end of the propeller shaft 1. When connected, the circular hole on the flange 4.1 is aligned with the flange of the propeller shaft 1 and then processed; the short pipe 4.2 is also provided with a symmetrical triangular bracket 4.3, which is arranged on the front side of the flange 4.1.

[0045] When the stern structure of the hull shrinks linearly, there is a false bulkhead in the hull structure in front of the stern shaft, and the track cannot extend to the top of the stern shaft. Therefore, a flange false shaft 4 is set at the front end of the propeller shaft 1 (i.e., the stern shaft).

[0046] The pneumatic hoist No. 1 9, the pneumatic hoist No. 2 10 and the pneumatic hoist No. 3 11 are arranged at the cabin lifting port, and the pneumatic hoist No. 1 9, the pneumatic hoist No. 2 10 and the pneumatic hoist No. 3 11 are arranged side by side;

[0047] There is a hull structure on the inner wall of the cabin, which is close to the entrance of the stern tube 5. A monorail beam trolley 6 is provided above the inner wall of the cabin. The monorail beam trolley 6 is arranged between the cabin lifting port and the entrance of the stern tube 5. The monorail beam trolley 6 is provided with a first hook 7 and a second hook 8, one in front and one behind.

[0048] A No. 4 pneumatic hoist 12, a No. 5 pneumatic hoist 13 and a No. 6 pneumatic hoist 14 are also provided on the inner wall of the cabin. The No. 4 pneumatic hoist 12 is arranged between the hull structure and the inlet end of the stern tube 5, the No. 5 pneumatic hoist 13 and the No. 6 pneumatic hoist 14 are arranged above the rear side of the outlet end of the stern tube 5, the No. 5 pneumatic hoist 13 is arranged above the outlet end of the stern tube 5, and the No. 6 pneumatic hoist 14 is arranged at the corner of the cabin behind the No. 5 pneumatic hoist 13.

[0049] The utility model provides a ship propeller shaft passing through stern tube auxiliary system, and its use method includes the following contents:

[0050] S1. Set up a hoisting and conveying system in the engine room;

[0051] S2. Set a threaded dummy shaft 2 at the rear end of the propeller shaft 1, and assemble an extension rod 3 inside the threaded dummy shaft 2;

[0052] S3. Use the gantry crane to lift the propeller shaft 1 into the cabin, and put the extension rod 3 and the threaded dummy shaft 2 into the cabin in advance;

[0053] S4. Use the gantry crane to hoist the propeller shaft 1 to the bottom of the No. 1 pneumatic hoist 9, No. 2 pneumatic hoist 10, and No. 3 pneumatic hoist 11 at the cabin lifting port. Switch the gantry crane to use the No. 1 pneumatic hoist 9, No. 2 pneumatic hoist 10, and No. 3 pneumatic hoist 11 to hoist the propeller shaft 1.

[0054] S5. Move the propeller shaft 1 toward the stern tube 5, and simultaneously switch the No. 1 pneumatic hoist 9, the No. 2 pneumatic hoist 10, and the No. 3 pneumatic hoist 11 to the first hook 7 and the second hook 8 on the monorail beam trolley 6;

[0055] S6. Raise the propeller shaft 1 and align the extension rod 3 with the center of the stern tube 5. The heights of the first hook 7 and the second hook 8 are set in advance according to the height of the stern tube 5. The monorail beam trolley 6 delivers the extension rod 3 into the stern tube 5.

[0056] S7. When the extension rod 3 and the threaded false shaft 2 are completely inserted into the stern tube 5, the first hook 7 is switched to the fourth pneumatic hoist 12 and the pushing is continued;

[0057] S8. After the extension rod 3 extends out of the stern tube 5, connect the slings of the No. 5 pneumatic hoist 13 and the No. 6 pneumatic hoist 14 to the end of the extension rod 3 and continue pushing;

[0058] S9. Set a flange dummy shaft 4 at the front end of the propeller shaft 1;

[0059] S10. After the extension rod 3 is fully extended from the stern tube 5, the lifting point of the first hook 7 is moved to the flange dummy shaft 4, and the propeller shaft 1 is pushed into place by utilizing the balance of the flange dummy shaft 4;

[0060] S11, removing the extension rod 3;

[0061] S12. Finally, remove the flange false shaft 4.

[0062] Working principle:

[0063] The utility model provides an auxiliary system for passing a propeller shaft through a stern tube of a ship. First, relevant dummy shaft tooling is manufactured; after the propeller shaft is hoisted into the engine room, a stern threaded dummy shaft is first connected; a lifting eye and a hoist at the stern of the hull are arranged in place; the hoist is switched during the process of the propeller shaft passing through the stern tube; after the stern hoist is in place, a dummy shaft with a flange at the front end of the propeller shaft is connected; the propeller shaft is finally moved into place by using the dummy shaft with the flange at the front end of the propeller shaft; and finally, an extension rod is removed.

[0064] During the stern tube insertion process, after the stern tube is exposed after the extension rod is extended, the sling is arranged on the extension rod. The principle of lever balance is used to ensure that the stern shaft is free in the stern tube during insertion. That is, the stern shaft does not contact the stern tube. The stern shaft and stern tube are in concentric circles (there is clearance between the stern shaft and the stern tube bearings above, below, left and right). After the stern shaft is moved to the designed position relative to the stern tube, it is slowly lowered onto the stern tube bearing. During this process, the stern shaft's center of gravity is controlled to be stable and prevent it from tipping over. The bending moment is equal at two fulcrums (at least two fulcrums). The sling in the middle of the propeller shaft is withdrawn when it approaches the front end of the stern tube. During the entire process of the propeller shaft passing through the stern tube, the propeller shaft does not come into contact with the sealing pipe bracket (screw) in the stern tube, ensuring that the propeller shaft itself is intact.

[0065] The above are only specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the scope of protection of the present invention.

Claims

1. A ship propeller shaft passing through stern tube auxiliary system, characterized by: It comprises a propeller shaft assembly and a hoisting and conveying system, wherein the propeller shaft assembly comprises a propeller shaft (1), a threaded dummy shaft (2), an extension rod (3) and a flange dummy shaft (4), and the hoisting and conveying system comprises a monorail beam trolley (6), a first hook (7), a second hook (8), a No. 1 pneumatic hoist (9), a No. 2 pneumatic hoist (10), a No. 3 pneumatic hoist (11), a No. 4 pneumatic hoist (12), a No. 5 pneumatic hoist (13) and a No. 6 pneumatic hoist (14); A threaded dummy shaft (2) is provided at the rear end of the propeller shaft (1), and an extension rod (3) is provided inside the threaded dummy shaft (2); the threaded dummy shaft (2) is connected to the propeller shaft (1) via a threaded connector (2.1), and the threaded dummy shaft (2) is sleeved with the extension rod (3) via a connecting tube (2.2), and the extension rod (3) is provided inside the connecting tube (2.2); a flanged dummy shaft (4) is provided at the front end of the propeller shaft (1); The pneumatic hoist No. 1 (9), the pneumatic hoist No. 2 (10) and the pneumatic hoist No. 3 (11) are arranged at the cabin hoisting port, and the pneumatic hoist No. 1 (9), the pneumatic hoist No. 2 (10) and the pneumatic hoist No. 3 (11) are arranged side by side; There is a hull structure on the inner wall of the engine room, and the hull structure is close to the entrance of the stern tube (5). A monorail beam trolley (6) is provided above the inner wall of the engine room, and the monorail beam trolley (6) is arranged between the engine room lifting port and the entrance of the stern tube (5). The monorail beam trolley (6) is provided with a first hook (7) and a second hook (8); a No. 4 pneumatic hoist (12), a No. 5 pneumatic hoist (13) and a No. 6 pneumatic hoist (14) are also provided on the inner wall of the engine room, and the No. 4 pneumatic hoist (12) is arranged between the hull structure and the entrance end of the stern tube (5).

2. A ship propeller shaft passing through stern tube auxiliary system according to claim 1, characterized in that: The No. 5 pneumatic hoist (13) and the No. 6 pneumatic hoist (14) are arranged above the rear side of the outlet end of the stern tube (5), the No. 5 pneumatic hoist (13) is arranged above the outlet end of the stern tube (5), and the No. 6 pneumatic hoist (14) is arranged at the cabin corner behind the No. 5 pneumatic hoist (13).

3. The ship propeller shaft passing through stern tube auxiliary system according to claim 1, characterized in that: The threaded dummy shaft (2) comprises a threaded connector (2.1) and a connecting pipe (2.2); the internal thread of the threaded connector (2.1) matches the rear end thread of the propeller shaft (1); the threaded connector (2.1) is sleeved on the rear end of the propeller shaft (1); and one end of the threaded connector (2.1) is connected to the connecting pipe (2.2).

4. The ship propeller shaft passing through stern tube auxiliary system according to claim 1, characterized in that: The inner wall of the connecting pipe (2.2) is provided with a circle of limit blocks (2.3) arranged along the circumference, and the limit blocks (2.3) are arranged close to the threaded connector (2.1).

5. The ship propeller shaft passing through stern tube auxiliary system according to claim 1, characterized in that: The outer wall of the connecting pipe (2.2) is provided with two symmetrical reinforcement plates (2.4), and the front end surfaces of the reinforcement plates (2.4) are fixed on the outer wall of the threaded connector (2.1).

6. The ship propeller shaft passing through stern tube auxiliary system according to claim 1, characterized in that: The outer wall of the connecting pipe (2.2) is provided with at least one reinforcing ring (2.5), and the reinforcing ring (2.5) is arranged at the rear section of the connecting pipe (2.2).

7. The ship propeller shaft passing through stern tube auxiliary system according to claim 1, characterized in that: The extension rod (3) comprises an extension tube (3.1), and a sealing plate (3.2) is provided on the front end surface of the extension tube (3.1).

8. A ship propeller shaft passing through stern tube auxiliary system according to claim 7, characterized in that: An ear plate (3.3) is provided on the sealing plate (3.2), and the ear plate (3.3) is used to be connected to the rear end face of the propeller shaft (1).

9. The ship propeller shaft passing through stern tube auxiliary system according to claim 1, characterized in that: The flange dummy shaft (4) comprises a flange (4.1) and a short pipe (4.2); one end of the short pipe (4.2) is sleeved with a flange (4.1); the flange (4.1) matches the front end of the propeller shaft (1).

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