Method for entering ship propeller shaft into cabin

Abstract

The invention relates to a method for entering a ship propeller shaft into a cabin. A related dummy shaft tool is manufactured; the propeller shaft is firstly connected with the stern threaded dummy shaft after being hung into a cabin; a ship stern lifting lug and a hoist are arranged in place; the hoist is switched in the process that the propeller shaft penetrates into the stern tube; after being in place, the stern hoist is connected with a propeller shaft front end flange dummy shaft; the propeller shaft is finally moved in place through the propeller shaft front flange dummy shaft; and finally dismounting the extension rod. 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 invention relates to the technical field of ship design and construction, and in particular to a method for inserting a propeller shaft into a ship cabin. 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 difficulties to the installation of the propeller shaft.

[0003] The support bearing of the ship propeller shaft is located in the closed stern tube. The stern tube lubricating oil lubricates the bearing oil film and fully fills the gap between the stern shaft and the stern tube in the stern tube, which is fully cooled. While it is beneficial to lubrication and cooling, it also brings about the limited space for the sling on the stern shaft to penetrate the stern tube. Especially in the process of penetrating the stern tube, the shaft part inside the stern tube cannot be used for leverage, and it is difficult to control the balance of the stern shaft. In the actual process of penetrating the stern shaft, the stern shaft is often scratched by the pipe bracket in the stern tube. If the scratching part occurs in the bearing gear, when the shaft is running, during the start / stop of the main engine, when the oil film is not formed, these scratches will form a "file" effect at low speed, thereby scraping the babbitt alloy on the bearing surface, causing a high bearing temperature alarm, and even causing bearing wear, resulting in huge economic losses when the ship enters the dock to replace the bearing. Therefore, the applicant proposes a method for entering the cabin of a ship propeller shaft and controlling the process of penetrating the stern tube. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a method for inserting a ship propeller shaft into a cabin, which solves the leverage point and balance problems during the propeller shaft insertion process, thereby avoiding the economic loss of replacing the bearing.

[0005] The object of the present invention is achieved in that: A method for inserting a propeller shaft into a ship cabin, comprising the following contents: S1. Install a hoisting and conveying system in the engine room; The hoisting and conveying system includes a monorail beam trolley, the first hook, the second hook, the No. 1 pneumatic hoist, the No. 2 pneumatic hoist, the No. 3 pneumatic hoist, the No. 4 pneumatic hoist, the No. 5 pneumatic hoist and the No. 6 pneumatic hoist. The No. 1 pneumatic hoist, the No. 2 pneumatic hoist and the No. 3 pneumatic hoist are arranged at the lifting port of the engine room, and the No. 1 pneumatic hoist, the No. 2 pneumatic hoist and the No. 3 pneumatic hoist are arranged side by side. S2. A threaded dummy shaft is arranged at the rear end of the propeller shaft, wherein an extension rod is arranged inside the threaded dummy shaft; The threaded dummy shaft is connected to the propeller shaft through a threaded connector, the threaded dummy shaft is sleeved with an extension rod through a connecting pipe, and the extension rod is arranged in the connecting pipe; S3. Use the gantry crane to lift the propeller shaft into the cabin, and put the extension rod and threaded dummy shaft into the cabin in advance; S4. Use the gantry crane to hoist the propeller shaft to the bottom of the No. 1, No. 2 and No. 3 pneumatic hoists at the cargo lifting port of the engine room, and switch the gantry crane to the No. 1, No. 2 and No. 3 pneumatic hoists to hoist the propeller shaft; S5, move the propeller shaft toward the stern tube, and simultaneously switch the No. 1 pneumatic hoist, the No. 2 pneumatic hoist, and the No. 3 pneumatic hoist to the first hook and the second hook on the monorail beam trolley; S6. Raise the propeller shaft and align the extension rod with the center of the stern tube. The heights of the first hook and the second hook are set in advance according to the height of the stern tube so that the propeller shaft and the stern tube remain coaxial. The monorail beam trolley delivers the extension rod into the stern tube. S7. When the extension rod and the threaded false shaft are completely inserted into the stern tube, switch the first hook to the No. 4 pneumatic hoist and continue pushing; S8. After the extension rod is extended out of the stern tube, connect the slings of the No. 5 and No. 6 pneumatic hoists to the end of the extension rod and continue to push; S9. A flange dummy shaft is arranged at the front end of the propeller shaft; S10, when the extension rod is fully extended out of the stern tube, the lifting point of the first lifting hook is moved to the flange dummy shaft, and the propeller shaft 1 is pushed into place by utilizing the balance of the flange dummy shaft; S11, remove the extension rod; S12. Finally, remove the flange dummy shaft.

[0006] Furthermore, 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.

[0007] Furthermore, 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, the No. 4 pneumatic hoist is arranged between the hull structure and the inlet end of the stern tube, 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.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] Furthermore, the outer wall of the connecting pipe is provided with at least one reinforcing ring, and the reinforcing ring is arranged at the rear section of the connecting pipe.

[0012] Furthermore, the extension rod comprises an extension tube, and a sealing plate is provided on the front end surface of the extension tube.

[0013] Furthermore, the sealing plate is provided with an ear plate, and the ear plate is used to connect with the rear end surface of the propeller shaft. Furthermore, the flange dummy shaft comprises a flange and a short pipe, one end of the short pipe is sleeved with a flange, the flange matches the front end of the propeller shaft, and during connection, the circular hole on the flange is aligned with the propeller shaft flange hole and then processed.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for inserting a propeller shaft into a ship cabin. 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 cabin for cooperation, two hooks are provided on a lifting beam trolley, one is used for lifting up and down, and the other is used for translation forward and backward. The hoisting and conveying system cooperates at each node to place the propeller shaft and the stern tube in concentric circle positions. During the entire process of the propeller shaft passing through the stern tube, the propeller shaft does not have any contact with a 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

[0015] Figure 1 The figure is a schematic diagram of the structure of the propeller shaft assembly of the present invention.

[0016] Figure 2 It is a cross-sectional view of the threaded pseudo shaft of the present invention.

[0017] Figure 3 It is a cross-sectional view of the extension rod of the present invention.

[0018] Figure 4 It is a cross-sectional view of the flange pseudo shaft of the present invention.

[0019] Figure 5 It is a schematic diagram of entering the cabin in step 4 of the present invention.

[0020] Figure 6 It is a schematic diagram of entering the cabin in step five of the present invention.

[0021] Figure 7 It is a schematic diagram of entering the cabin in step six of the present invention.

[0022] Figure 8It is a schematic diagram of entering the cabin in step seven of the present invention.

[0023] Fig. 9 This is a schematic diagram of entering the cabin in step eight of the present invention.

[0024] Fig.10 This is a schematic diagram of entering the cabin in step ten of the present invention.

[0025] Fig.11 It is a schematic diagram of entering the cabin in step eleven of the present invention.

[0026] Fig.12 This is a schematic diagram of entering the cabin in step twelve of the present invention.

[0027] Fig.13 It is a schematic diagram of the inclined axis system of the present invention.

[0028] Fig.14 It is a schematic diagram of the limited space directly above the propeller shaft of the present invention.

[0029] Fig.15 It is a schematic diagram of the hull structure obstacle of the present invention.

[0030] in: 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, flange dummy shaft 4, flange 4.1, short pipe 4.2, triangular bracket 4.3, stern tube 5, monorail 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

[0031] In order to better understand the technical solution of the present invention, the following will be described in detail in conjunction with 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, and are only implementations that can be adopted by the technical solution of the present invention. It should be noted that the description of the positional relationship of each component in this article, such as component A being located above component B, is based on the description of the relative positions of the components in the illustration, and is not intended to limit the actual positional relationship of the components. Example 1

[0032] See also Figure 1-Figure 15 , Figure 1 A structural schematic diagram of the propeller shaft assembly of the present invention is drawn. As shown in the figure, a method for inserting a propeller shaft into a ship cabin of the present invention includes the following contents: S1. Install a hoisting and conveying system in the engine room; 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. The No. 1 pneumatic hoist 9, the No. 2 pneumatic hoist 10 and the No. 3 pneumatic hoist 11 are arranged at the lifting port of the engine room, and the No. 1 pneumatic hoist 9, the No. 2 pneumatic hoist 10 and the No. 3 pneumatic hoist 11 are arranged side by side; 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 in front and behind. 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 cabin corner behind the No. 5 pneumatic hoist 13.

[0033] S2. A threaded dummy shaft 2 is arranged at the rear end of the propeller shaft 1, and an extension rod 3 is arranged inside the threaded dummy shaft 2; The threaded pseudo shaft 2 comprises 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. 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; the outer wall of the connecting pipe 2.2 is provided with two symmetrical reinforcing plates 2.4, and the front end faces of the reinforcing plates 2.4 are fixed on the outer wall of the threaded connector 2.1; the outer wall of the connecting pipe 2.2 is provided with at least one circle of reinforcing ring 2.5, and the reinforcing ring 2.5 is arranged at the rear section of the connecting pipe 2.2.

[0034] The threaded dummy shaft 2 is connected to the propeller shaft 1 through a threaded connector 2.1, and the threaded dummy shaft 2 is sleeved with an extension rod 3 through a connecting tube 2.2, and the extension rod 3 is arranged in the connecting tube 2.2.

[0035] The extension rod 3 includes an extension tube 3.1, the length of which is not less than half of the inner length of the stern tube 5; a sealing plate 3.2 is provided on the front end face of the extension tube 3.1, and an ear plate 3.3 is provided on the sealing plate 3.2, and the ear plate 3.3 is used to connect with the rear end face of the propeller shaft 1.

[0036] 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; S4, 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 cargo lifting port of the engine room through the gantry crane, and switch the gantry crane to the No. 1 pneumatic hoist 9, No. 2 pneumatic hoist 10 and No. 3 pneumatic hoist 11 to hoist the propeller shaft 1; 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; S6, raising the propeller shaft 1 to 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; 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; S8, after the extension rod 3 extends out of the stern tube 5, the slings of the No. 5 pneumatic hoist 13 and the No. 6 pneumatic hoist 14 are connected to the ends of the extension rod 3, and the pushing continues; S9, a flange dummy shaft 4 is arranged at the front end of the propeller shaft 1; 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, and when connected, the circular hole on the flange 4.1 is aligned with the flange hole of the propeller shaft 1 and then processed; the short pipe 4.2 is also provided with a symmetrical triangular bracket 4.3, and the triangular bracket 4.3 is arranged on the front side of the flange 4.1.

[0037] 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 directly above 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).

[0038] S10, when 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; S11, removing the extension rod 3; S12, finally remove the flange false shaft 4.

[0039] Working principle: The invention provides a method for inserting a propeller shaft into a cabin of a ship. First, relevant dummy shaft tooling is manufactured; after the propeller shaft is hoisted into the cabin, a stern threaded dummy shaft is first connected; a stern lifting lug and a hoist 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 front flange dummy shaft of the propeller shaft is connected; the front flange dummy shaft of the propeller shaft is finally moved into place by using the propeller shaft; and finally, an extension rod is removed.

[0040] During the process of inserting the stern tube, after the stern tube is exposed after the extension rod is connected, the sling is arranged on the extension rod, and the lever balance principle is used to ensure that the stern shaft is free during the insertion of the stern tube, that is, to ensure that the stern shaft does not contact the stern tube, and the stern shaft and the stern tube are in concentric circles (there is a gap between the stern shaft and the stern tube bearings on the upper, lower, left and right sides). After the stern shaft moves to the designed position relative to the stern tube, the stern shaft is slowly lowered onto the stern tube bearing. During the process, the center of gravity of the stern shaft is controlled to be stable through the conveying system without overturning, and 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 is close to the front end of the stern tube. During the entire process of the propeller shaft inserting the stern tube, the propeller shaft does not have any contact with the sealing pipe bracket (screw) in the stern tube, ensuring that the propeller shaft itself is intact.

[0041] The above are only specific application examples of the present invention and do not constitute any limitation on the protection scope of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the present invention.

Claims

1. A method for inserting a propeller shaft into a ship cabin, characterized in that: Includes the following: S1. Install a hoisting and conveying system in the engine room; The lifting and conveying system comprises a monorail beam trolley (6), a first lifting hook (7), a second lifting 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), wherein the No. 1 pneumatic hoist (9), the No. 2 pneumatic hoist (10) and the No. 3 pneumatic hoist (11) are arranged at a lifting opening of the engine room, and the No. 1 pneumatic hoist (9), the No. 2 pneumatic hoist (10) and the No. 3 pneumatic hoist (11) are arranged side by side; S2, a threaded dummy shaft (2) is arranged at the rear end of the propeller shaft (1), and an extension rod (3) is arranged inside the threaded dummy shaft (2); The threaded dummy shaft (2) is connected to the propeller shaft (1) via a threaded connector (2.1); the threaded dummy shaft (2) is sleeved to an extension rod (3) via a connecting tube (2.2); and the extension rod (3) is arranged in the connecting tube (2.2); S3. Use a 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; S4, hoisting the propeller shaft (1) to below the No. 1 pneumatic hoist (9), No. 2 pneumatic hoist (10) and No. 3 pneumatic hoist (11) at the cargo lifting opening of the engine room through the gantry crane, and switching the gantry crane to the No. 1 pneumatic hoist (9), No. 2 pneumatic hoist (10) and No. 3 pneumatic hoist (11) to hoist the propeller shaft (1); S5, moving the propeller shaft (1) toward the stern tube (5), and simultaneously switching 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); S6, raising the propeller shaft (1) and aligning 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), so that the propeller shaft (1) and the stern tube (5) remain coaxial; the monorail beam trolley (6) delivers the extension rod (3) into the stern tube (5); 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; S8. After the extension rod (3) extends out of the stern tube (5), the slings of the No. 5 pneumatic hoist (13) and the No. 6 pneumatic hoist (14) are connected to the end of the extension rod (3) and the push is continued; S9, a flange dummy shaft (4) is arranged at the front end of the propeller shaft (1); S10, when the extension rod (3) is completely extended from the stern tube (5), the lifting point of the first lifting 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); S11, removing the extension rod (3); S12. Finally, remove the flange dummy shaft (4).

2. A method for placing a propeller shaft into a ship cabin according to claim 1, characterized in that: A hull structure is provided on the inner wall of the engine room, the hull structure being close to the entrance of the stern tube (5). A monorail beam trolley (6) is provided above the inner wall of the engine room. The monorail beam trolley (6) is arranged between the lifting opening of the engine room and the entrance of the stern tube (5). A first hook (7) and a second hook (8) are provided on the monorail beam trolley (6).

3. A method for placing a propeller shaft into a ship cabin according to claim 1, characterized in that: A No. 4 pneumatic hoist (12), a No. 5 pneumatic hoist (13) and a No. 6 pneumatic hoist (14) are also arranged on the inner wall of the engine room, wherein 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 engine room behind the No. 5 pneumatic hoist (13).

4. A method for placing a propeller shaft into a ship cabin according to claim 1, characterized in that: The threaded pseudo shaft (2) comprises 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); and one end of the threaded connector (2.1) is connected to the connecting tube (2.2).

5. A method for placing a propeller shaft into a ship cabin according to claim 4, 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).

6. A method for placing a propeller shaft into a ship cabin according to claim 4, characterized in that: The outer wall of the connecting pipe (2.2) is provided with two symmetrical reinforcing plates (2.4), and the front end surfaces of the reinforcing plates (2.4) are fixed on the outer wall of the threaded connecting head (2.1).

7. A method for placing a propeller shaft into a ship cabin according to claim 4, 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).

8. A method for placing a propeller shaft into a ship cabin 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).

9. A method for placing a propeller shaft into a ship cabin according to claim 8, 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 surface of the propeller shaft (1).

10. A method for placing a propeller shaft into a ship cabin 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); when connected, the circular hole on the flange (4.1) is aligned with the flange hole of the propeller shaft (1) and then processed.

Images