A method of inspecting stern tube rear bearing for stern shaft extraction

Abstract

The application discloses a stern shaft extraction method for checking a stern tube rear bearing, and the stern shaft and a first intermediate shaft are suspended above a duralumin plate platform in a cabin by using a chain block and an eye plate and are not interfered with main engine auxiliary equipment, a second intermediate shaft is sunk and placed on a sleeper arranged on a double-layer bottom plate, the stern shaft can be extracted from the cabin without opening a hole in a hull plate, the stern tube rear bearing can be quickly checked, space can be saved, and the stern tube rear bearing can be replaced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stern tube rear bearing maintenance, and particularly relates to a stern shaft extraction method for checking stern tube rear bearing. BACKGROUND

[0002] Currently, accidents of ship shafting mostly occur in stern tube rear bearing, and when high-temperature burning of stern tube rear bearing, bearing failure and the like occur, the ship needs to be docked to check the condition of the stern tube rear bearing. Before checking the stern tube rear bearing, the stern shaft needs to be extracted, because the stern shaft is usually a flange shaft, and the usual scheme is to extract the stern shaft from the inside of the engine room and then hoist it out of the engine room, which needs to open a hole in the hull plate, and if the opening area is arranged with engine room equipment and pipelines, the engine room equipment and pipelines need to be removed first, then the hole is opened in the outer plate, and then the stern shaft is extracted from the engine room. The traditional stern shaft extraction method not only needs to repeatedly disassemble and assemble the engine room equipment and pipelines, which consumes a large amount of construction time, but also damages the structural strength of the ship structure when the hole is opened in the outer plate. SUMMARY

[0003] Therefore, the present application provides a stern shaft extraction method for checking stern tube rear bearing, which does not need to open a hole in the hull plate, does not need to extract the stern shaft from the engine room, can check the condition of the stern tube rear bearing, and can also save space and replace the stern tube rear bearing.

[0004] A stern shaft extraction method for checking stern tube rear bearing, specifically comprising the following steps:

[0005] S1, a horizontal beam is arranged on the bulkhead, a first hand-operated hoist and a second hand-operated hoist are installed on the horizontal beam, and a first eye plate, a second eye plate, a third eye plate and a fourth eye plate are fixed on the deck above the horizontal beam;

[0006] S2, the first intermediate shaft is lifted vertically upward by using the first hand-operated hoist and the second hand-operated hoist, and the first intermediate shaft is hoisted to a sixth position by using a binding belt fixed on the third eye plate and the fourth eye plate;

[0007] S3, the second intermediate shaft is sunk to a fifth position of the double bottom by using the first hand-operated hoist and the second hand-operated hoist;

[0008] S4, the stern shaft is extracted horizontally from a first position in the stern tube to a second position by using the first hand-operated hoist and the second hand-operated hoist, and the stern shaft is lifted vertically upward from the second position to a third position;

[0009] S5, the stern shaft at the third position is transferred to a fourth position by using a binding belt fixed on the first eye plate and the second eye plate;

[0010] S6, a worker checks the rear bearing in the stern tube.

[0011] Preferably, the No. 1 eye plate, the No. 2 eye plate, the No. 3 eye plate and the No. 4 eye plate are all fixed on the reinforcing ribs of the lower end surface of the deck.

[0012] Preferably, the No. 1 eye plate and the No. 2 eye plate are located on one side of the cross beam, and the No. 3 eye plate and the No. 4 eye plate are located on the other side of the cross beam, and the cross beam is located in the same vertical plane as the unextracted stern shaft, the No. 1 intermediate shaft and the No. 2 intermediate shaft.

[0013] Preferably, the specific steps of sinking the No. 2 intermediate shaft to the fifth position on the double-layer bottom by using the No. 1 hand-operated hoist and the No. 2 hand-operated hoist in step S3 are as follows:

[0014] The No. 2 intermediate shaft is hoisted upward by using the No. 1 hand-operated hoist and the No. 2 hand-operated hoist to separate the bearing of the No. 2 intermediate shaft from the bearing base;

[0015] Then, the No. 2 intermediate shaft is moved horizontally to disengage the bearing of the No. 2 intermediate shaft from the bearing base, and the No. 2 intermediate shaft is lowered vertically to pass through the bearing base of the No. 1 intermediate shaft and the bearing base of the No. 2 intermediate shaft and then sink and sit on the sleepers arranged on the double-layer bottom plate.

[0016] Preferably, two sleepers are arranged, and the two sleepers are arranged on the side edges of the bearing base of the No. 1 intermediate shaft and the bearing base of the No. 2 intermediate shaft, respectively.

[0017] Preferably, the sixth position is a position above the perforated plate platform and does not interfere with the main engine auxiliary equipment located above the perforated plate platform.

[0018] Preferably, the end of the cross beam away from the bulkhead is further fixed to the deck by a structural member.

[0019] Preferably, the structural member is a reinforcing plate or a rib plate.

[0020] Preferably, the cross beam is an I-beam.

[0021] The beneficial effects of the present application are as follows:

[0022] The present application suspends the stern shaft and the No. 1 intermediate shaft in a position above the perforated plate platform in the engine room and does not interfere with the main engine auxiliary equipment by using the hand-operated hoist and the eye plate, and sinks and sits the No. 2 intermediate shaft on the sleepers arranged on the double-layer bottom plate, so that the stern shaft can be extracted from the engine room without opening holes in the hull plate, thereby quickly checking the condition of the stern tube rear bearing, saving space and realizing the replacement of the stern tube rear bearing. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings also belong to the protection scope of the present application.

[0024] Figure 1 is a structure diagram of the stern shaft of the present application when the stern shaft is not extracted;

[0025] Figure 2 is a side view of the stern shaft of the present application after the stern shaft is extracted;

[0026] Figure 3 is a top view of the stern shaft of the present application after the stern shaft is extracted;

[0027] Figure 4 is a schematic diagram of the intermediate bearing base of the present application.

[0028] Figure 5 is Figure 4 is a sectional view along A-A direction.

[0029] The meanings of the reference numerals in the drawings are as follows:

[0030] 1 is a stern shaft, 2 is a first intermediate shaft, 3 is a second intermediate shaft, 4 is a first intermediate shaft bearing base, 5 is a second intermediate shaft bearing base, 6 is a first intermediate shaft bearing, 7 is a second intermediate shaft bearing, 8 is a cross beam, 9 is a first hand-operated hoist, 10 is a second hand-operated hoist, 11 is a first eye plate, 12 is a second eye plate, 13 is a third eye plate, 14 is a fourth eye plate, 15 is a first sleeper, 16 is a second sleeper, 17 is a deck, 18 is a perforated steel platform, 19 is a double bottom, and 20 is a stern tube. DETAILED DESCRIPTION

[0031] In order to better understand the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the drawings.

[0032] It should be clear that the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort also belong to the protection scope of the present application.

[0033] The present application will be described in further detail below through specific embodiments and in combination with the drawings.

[0034] The present application provides a stern shaft extraction method for checking a stern tube rear bearing, which specifically comprises the following steps:

[0035] S1, a horizontal beam 8 is arranged on the bulkhead, a No. 1 hand-operated hoist 9 and a No. 2 hand-operated hoist 10 are arranged on the horizontal beam, and a No. 1 eye plate 11, a No. 2 eye plate 12, a No. 3 eye plate 13 and a No. 4 eye plate 14 are respectively fixed on a deck 17 above the horizontal beam 8.

[0036] The No. 1 eye plate 11, the No. 2 eye plate 12, the No. 3 eye plate 13 and the No. 4 eye plate 14 are all fixed on the reinforcing ribs of the deck 17 as close to the horizontal beam as possible.

[0037] In the horizontal direction, the No. 1 eye plate 11 and the No. 2 eye plate 12 are located on one side of the horizontal beam 8, and the No. 3 eye plate 13 and the No. 4 eye plate 14 are located on the other side of the horizontal beam 8. In the vertical direction, the horizontal beam 8 is located in the same vertical plane as the stern shaft 1, the No. 1 intermediate shaft 2 and the No. 2 intermediate shaft 3 which are not lifted off.

[0038] Preferably, the end of the horizontal beam 8 away from the bulkhead is further fixed to the deck 17 by a structural member. In this embodiment, the structural member is a reinforcing plate or a rib plate, and the horizontal beam 8 is an I-beam.

[0039] S2, the No. 1 intermediate shaft 2 is lifted vertically upward to above the expanded metal platform 18 by the No. 1 hand-operated hoist 9 and the No. 2 hand-operated hoist 10, and then the No. 1 intermediate shaft 2 is lifted to the sixth position by the straps fixed on the No. 3 eye plate 13 and the No. 4 eye plate 14.

[0040] The sixth position refers to any position above the expanded metal platform 18 which does not interfere with the main engine auxiliary equipment located above the expanded metal platform 18.

[0041] The main engine auxiliary equipment includes oil pumps, coolers and the like.

[0042] S3, the No. 2 intermediate shaft 3 is lowered to the fifth position on the double bottom by the No. 1 hand-operated hoist 9 and the No. 2 hand-operated hoist 10.

[0043] Specifically, first, the No. 2 intermediate shaft 3 is lifted upward by the No. 1 hand-operated hoist 9 and the No. 2 hand-operated hoist 10 so that the bearing 6 of the No. 2 intermediate shaft 3 is separated from the bearing base 5;

[0044] Then, the No. 2 intermediate shaft 3 is moved horizontally so that the bearing 6 of the No. 2 intermediate shaft 3 is offset from the bearing base 5, and then the No. 2 intermediate shaft 3 is lowered vertically so that it passes through the No. 1 intermediate shaft bearing base 4 and the No. 2 intermediate shaft bearing base 5 and is then lowered to rest on the sleepers 16 / 17 arranged on the double bottom plate.

[0045] In this embodiment, two sleepers are arranged, and the two sleepers are respectively arranged on the side edges of the No. 1 intermediate shaft bearing base 4 and the No. 2 intermediate shaft bearing base 5.

[0046] S4, the stern shaft 1 is horizontally pulled out from the first position in the stern tube to the second position by using the No. 1 hand-operated hoist 9 and the No. 2 hand-operated hoist 10, and then the stern shaft is vertically lifted upward from the second position to the third position.

[0047] S5, the stern shaft at the third position is transferred to the fourth position by using the belts fixed on the No. 1 eye plate 11 and the No. 2 eye plate 12.

[0048] S6, after the No. 1 intermediate shaft 2, the No. 2 intermediate shaft 3 and the stern shaft 1 are all placed, the staff checks the rear bearing in the stern tube.

[0049] The above merely describes the preferred embodiments of the present application and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for removing the stern shaft to inspect the aft bearing of the stern tube, characterized in that, Specifically, the following steps are included: S1, set a horizontal beam on the bulkhead, install No. 1 and No. 2 hand chain hoists on the beam, and fix No. 1 eye plate, No. 2 eye plate, No. 3 eye plate and No. 4 eye plate on the deck above the beam respectively. S2, use the No. 1 and No. 2 chain hoists to lift the No. 1 intermediate shaft vertically upward, and then use the straps fixed to the No. 3 and No. 4 eye plates to hoist the No. 1 intermediate shaft to the sixth position. S3, use the No. 1 and No. 2 chain hoists to lower the No. 2 intermediate shaft to the fifth position of the double bottom; S4. Use the No. 1 and No. 2 chain hoists to horizontally pull the stern shaft out from the first position inside the stern tube to the second position, and then lift the stern shaft vertically upward from the second position to the third position. S5, using the straps fixed to eyeplates 1 and 2, the stern shaft in the third position is moved to the fourth position; S6, staff inspect the rear bearing inside the stern tube.

2. The method for removing the stern shaft to inspect the stern tube bearing according to claim 1, characterized in that, Eyeplates No. 1, No. 2, No. 3 and No. 4 are all fixed to the reinforcing ribs on the lower end face of the deck.

3. The method for removing the stern shaft to inspect the stern tube bearing according to claim 1 or 2, characterized in that, Eyeplates No. 1 and No. 2 are located on one side of the crossbeam, and eyeplates No. 3 and No. 4 are located on the other side of the crossbeam. The crossbeam, the stern shaft that has not been pulled out and lifted, and intermediate shafts No. 1 and No. 2 are located in the same vertical plane.

4. The method for removing the stern shaft to inspect the stern tube bearing according to claim 1, characterized in that, The specific steps in step S3 of using chain hoists No. 1 and No. 2 to lower the No. 2 intermediate shaft to the fifth position of the double-layer bottom are as follows: Use the No. 1 and No. 2 hand chain hoists to lift the No. 2 intermediate shaft upwards to separate its bearing from the bearing base; Then, move the No. 2 intermediate shaft horizontally to separate its bearing from the bearing base, and then lower the No. 2 intermediate shaft vertically so that it passes through the bearing bases of the No. 1 and No. 2 intermediate shafts and sinks down to sit on the sleepers set on the double-layer base plate.

5. The method for removing the stern shaft to inspect the stern tube bearing according to claim 4, characterized in that, Two sleepers are provided, with the two sleepers respectively located on the sides of the No. 1 intermediate shaft bearing base and the No. 2 intermediate shaft bearing base.

6. The method for removing the stern shaft to inspect the stern tube bearing according to claim 1, characterized in that, The sixth position is a position above the corrugated steel plate platform that will not cause the No. 1 intermediate shaft to interfere with the main auxiliary equipment located above the corrugated steel plate platform.

7. The method for removing the stern shaft to inspect the stern tube bearing according to claim 1, characterized in that, The end of the beam furthest from the bulkhead is also fixed to the deck by structural components.

8. The method for removing the stern shaft to inspect the stern tube bearing according to claim 7, characterized in that, The structural component is a reinforcing plate or a rib.

9. The method for removing the stern shaft to inspect the stern tube bearing according to claim 7, characterized in that, The crossbeam is an I-beam.

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