A shaft locking device for LNG ship shafting and its installation method

Abstract

This invention discloses an installation method for a shaft locking device for an LNG ship's shaft system. The method involves first welding a fixed base to the hull structure on one side of the second shaft flange, placing a column on the fixed base, and then placing a locking block on the column. Next, a sleeve is inserted into the shaft locking disc from the second shaft flange side. The positions of the locking block and column are adjusted according to the sleeve to ensure that the plunger on the locking block can be inserted into the sleeve. After adjustment, the locking block and column are fixed, and the sleeve is removed. This method effectively ensures the gap between the plunger and the plunger hole on the shaft locking disc, preventing misalignment between the plunger and the plunger hole on the shaft locking disc, thereby improving the installation accuracy and efficiency of the shaft locking device.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a shaft locking device for LNG ship shafting and its installation method. Background Technology

[0002] LNG carriers typically have two marine diesel engines. When one engine fails, the other can still operate normally. During navigation, the stern current generates torque on the non-operating propeller, causing the shafting to rotate. This torque is then transmitted to the diesel engine, negatively impacting its performance. Therefore, a shaft lock is necessary to prevent the propeller and main engine from rotating. One type of shaft lock uses a plunger inserted into a hole in a shaft lock disc. However, maintaining a very small gap between the plunger and the hole in the shaft lock disc, and the need to fix the locking block to the hull structure, presents significant installation challenges. Therefore, designing a suitable shaft lock fixing method and installation mechanism is a pressing issue. Summary of the Invention

[0003] In view of this, the present invention provides an LNG ship shafting locking device and its installation method to solve the problems existing in the background art.

[0004] A method for installing a shaft locking device for an LNG carrier shafting system specifically includes the following steps:

[0005] S1, place the locking disc between the first shaft flange and the second shaft flange, and use connecting bolts to fix the first shaft flange, the locking disc and the second shaft flange into one piece;

[0006] S2, weld the fixed base to the hull structure on the side of the second shaft flange A, and place the column on the fixed base;

[0007] S3, place the locking block with the retractable plunger on the column, the initial state of the plunger is the retracted state;

[0008] S4, insert the sleeve into the plunger hole of the locking disc from side B of the first shaft flange;

[0009] S5, adjust the position of the locking block so that its plunger is aligned with the sleeve, and make the plunger extend out of the locking block to insert into the sleeve;

[0010] S6. Adjust the position of the column so that the locking block is in the middle of the column support surface. After adjusting, weld the bottom of the column to the fixed base.

[0011] S7. Fill the gap between the upper surface of the column and the lower surface of the locking block with shims caused by welding deformation, and then use bolts to lock and fix the locking block to the column.

[0012] S8, retract the plunger into the locking block, and then remove the sleeve.

[0013] Preferably, the sleeve includes a cylindrical body and a ring folded outward from one end of the cylindrical body. When the cylindrical body of the sleeve is inserted into the plunger hole of the locking disc, the ring is attached to the B side of the locking disc.

[0014] Preferably, the wall thickness of the cylinder is equal to the difference between the plunger hole diameter and the plunger diameter of the locking disc.

[0015] Preferably, the wall thickness of the cylinder is 2 mm.

[0016] Preferably, the sleeve is made of thin sheet iron or copper, and the gasket is made of thin sheet copper.

[0017] Preferably, the column has an I-shaped structure, with the lower panel of the column welded and fixed to the fixed base, and the upper panel fixed to the locking block by bolts.

[0018] An LNG ship shafting locking device includes a locking disc disposed between a first shaft flange and a second shaft flange and fixed to the first shaft flange and the second shaft flange by bolts, a fixed base welded to the hull structure on the A side of the second shaft flange, a column welded to the fixed base, a locking block fixed to the column by bolts, and a sleeve inserted into a plunger hole of the locking disc from the B side of the first shaft flange. The locking block is provided with a retractable plunger, the plunger is aligned with the sleeve, and a gasket is filled in the welding deformation gap between the locking block and the column.

[0019] The beneficial effects of this invention are:

[0020] 1. In this invention, the fixed base is first welded and fixed to the hull structure on one side of the second shaft flange. The column is placed on the fixed base, and the locking block is placed on the column. Then, the sleeve is inserted into the locking disc from one side of the second shaft flange. The position of the locking block and the column is adjusted according to the sleeve to ensure that the plunger on the locking block can be inserted into the sleeve. After adjustment, the locking block and the column are fixed, and the sleeve is removed. This can effectively ensure the gap between the plunger and the plunger hole on the locking disc, prevent the plunger from misaligning with the plunger hole on the locking disc, and thus improve the installation accuracy and efficiency of the locking device.

[0021] 2. In this invention, after inserting the plunger into the sleeve, the position of the column is adjusted and fixed. This effectively ensures the gap between the plunger and the plunger hole on the locking disc, and avoids the welding deformation caused by welding the lower end of the column when it is welded to the fixed base, which affects the position of the plunger. This ensures the positional accuracy of the plunger. At the same time, after the column is welded and fixed, the gap between the upper surface of the column and the lower surface of the locking block caused by welding deformation is filled with shims. This prevents the plunger from retracting and the plunger from shifting slightly after the sleeve is removed. This prevents the plunger from misaligning with the plunger hole on the locking disc and avoids the situation where the plunger cannot be inserted into the plunger hole. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the installation status of the locking shaft device.

[0024] Figure 2 This is an end view of the locking disc 3.

[0025] Figure 3 This is a schematic diagram of the sleeve structure.

[0026] Figure 4 This is a schematic diagram of the installation steps for the locking shaft device.

[0027] The meanings of the labels in the diagram are as follows:

[0028] 1 is the first shaft flange, 2 is the second shaft flange, 3 is the locking disc, 4 is the locking block, 5 is the plunger, 6 is the column, 7 is the fixed base, 8 is the gasket, 9 is the sleeve, 91 is the cylinder body, and 92 is the cylinder ring. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0030] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0031] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information.

[0032] The present application will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0033] This invention provides a method for installing a shaft locking device for an LNG ship's shafting system, specifically including the following steps:

[0034] S1, place the locking disc 3 between the first shaft flange 1 and the second shaft flange 2, and use connecting bolts to fix the first shaft flange 1, the locking disc 3 and the second shaft flange 2 into one piece.

[0035] The first shaft flange 1 is a flange on the stern shaft, the second shaft flange 2 is a flange on the intermediate shaft, the surface of the locking disc 3 is larger than the flange surfaces of the first shaft flange and the second shaft flange, the plunger holes on the locking disc 3 are located outside the shaft flange, and the locking disc 3 has multiple plunger holes. In this embodiment, the locking disc 3 is provided with 2 plunger holes, and the 2 plunger holes are symmetrically arranged along the center line of the locking disc.

[0036] S2, weld the fixed base 7 to the hull structure on the side of the second shaft flange 2A, and place the column 6 on the fixed base 7.

[0037] S3, place the locking block 4 with the retractable plunger 5 on the column 6. The initial state of the plunger 5 is the retracted state.

[0038] S4, insert the sleeve 9 into the plunger hole of the locking disc 3 from the B side of the first shaft flange 1.

[0039] The sleeve 9 includes a cylindrical body 91 and a cylindrical ring 92 folded outward from one end of the cylindrical body 91. When the cylindrical body 91 of the sleeve 9 is inserted into the plunger hole of the locking disc 3, the cylindrical ring 92 is attached to side B of the locking disc 3. Figure 3 As shown, the outer diameter of cylinder 91 is D3, and the inner diameter is D2. Figure 1 The diameter of the middle plunger 5 is D1. Figure 2The aperture diameter of the plunger hole on the middle locking shaft disc is D4. Therefore, it is necessary to satisfy D1 < D2 < D3 < D4. Preferably, the wall thickness of the cylinder body 91 is equal to the difference between the aperture diameter of the plunger hole of the locking shaft disc 3 and the diameter of the plunger 5. After the locking shaft device is installed, a certain width of gap can be exactly reserved between the plunger 5 and the plunger hole, thereby improving the installation accuracy of the locking shaft installation.

[0040] In this embodiment, the wall thickness of the cylinder body 91 is 2 mm, that is, the diameter D1 of the plunger 5 is 2 mm smaller than the aperture diameter D4 of the plunger hole.

[0041] In this embodiment, the sleeve 9 is made of thin iron sheet or copper sheet.

[0042] S5. Adjust the position of the locking block 4 so that its plunger 5 is aligned with the sleeve, and make the plunger 5 extend out of the locking block 4 to insert into the sleeve (9).

[0043] S6. Adjust the position of the column 6 so that the locking block 4 is located at the middle position of the support surface of the column 6. After adjustment, weld and fix the bottom of the column 6 to the fixed base 7.

[0044] S7. Fill the welding deformation gap generated between the upper surface of the column 6 and the lower surface of the locking block 4 with gaskets 8, and then lock and fix the locking block 4 and the column 6 with bolts.

[0045] In this embodiment, the gasket 8 is a thin copper sheet.

[0046] In this embodiment, the column 6 is of I-shaped structure. The lower panel of the column 6 is welded and fixed on the fixed base 7, and the upper panel is fixed to the locking block 4 with bolts.

[0047] S8. Retract the plunger 5 into the locking block 4, and then remove the sleeve 9.

[0048] Preferably, the order of the above steps S3 and S4 can be interchanged.

[0049] The present invention also provides a locking shaft device for the shafting of an LNG ship, including a locking shaft disc 3 arranged between the first shaft flange 1 and the second shaft flange 2 and fixed to the first shaft flange 1 and the second shaft flange 2 with bolts, a fixed base 7 welded and fixed on the hull structure on the A side of the second shaft flange 2, a column 6 welded and fixed on the fixed base 7, a locking block 4 fixed on the column 6 with bolts, and a sleeve 9 inserted into the plunger hole of the locking shaft disc 3 from the B side of the first shaft flange 1. The locking block 4 is provided with a telescopic plunger 5, the plunger 5 is aligned with the sleeve 9, and gaskets 8 are filled in the welding deformation gap between the locking block 4 and the column 6.

[0050] As Figure 2 shown, Figure 2The locking disc 3 has two plunger holes. Therefore, when setting up the locking device, the number of the locking devices should match the number of plunger holes on the locking disc 3, that is, a locking device needs to be set at the position of each plunger hole.

[0051] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A method of installing a shaft locking device for a shafting of an LNG carrier, characterized in that, Specifically comprising the following steps: S1, placing the locking shaft disc (3) between the first shaft flange (1) and the second shaft flange (2), and fixing the first shaft flange (1), the locking shaft disc (3) and the second shaft flange (2) into one body by connecting bolts; S2, welding the fixing base (7) to the ship structure on the A side of the second shaft flange (2), and placing the stand column (6) on the fixing base (7); S3, placing the locking block (4) with the telescopic plunger (5) on the stand column (6), and the initial state of the plunger (5) is the retracted state; S4, inserting the sleeve (9) into the plunger hole of the locking shaft disc (3) from the B side of the first shaft flange (1); The sleeve (9) comprises a barrel (91) and a barrel ring (92) folded outward from one end of the barrel (91), when the barrel (91) of the sleeve (9) is inserted into the plunger hole of the locking shaft disc (3), the barrel ring (92) is attached to the B side of the locking shaft disc (3); the thickness of the barrel wall of the barrel (91) is equal to the difference between the plunger hole diameter of the locking shaft disc (3) and the diameter of the plunger (5); S5, adjusting the position of the locking block (4) to make the plunger (5) of the locking block (4) align with the sleeve, and making the plunger (5) extend out of the locking block (4) to be inserted into the sleeve (9); S6, adjusting the position of the stand column (6) to make the locking block (4) be located in the middle position of the supporting surface of the stand column (6), and welding the bottom of the stand column (6) to the fixing base (7) after the adjustment is completed; S7, filling the gasket (8) into the welding deformation gap between the upper surface of the stand column (6) and the lower surface of the locking block (4) caused by welding, and then locking and fixing the locking block (4) and the stand column (6) by bolts; S8, retracting the plunger (5) into the locking block (4), and then removing the sleeve (9).

2. The method of installing a LNG carrier shafting lock shaft device according to claim 1, characterized in that, The thickness of the barrel wall of the barrel (91) is 2mm.

3. The method of installing a LNG carrier shafting lock shaft device according to claim 1, characterized in that, The sleeve (9) is made of thin iron sheet or copper sheet, and the gasket (8) is made of thin copper sheet.

4. The method of installing a LNG carrier shafting lock shaft device according to claim 1, characterized in that, The stand column (6) is in the shape of an I-beam, the lower panel of the stand column (6) is welded to the fixing base (7), and the upper panel is fixed to the locking block (4) by bolts.

5. A LNG carrier shafting lock shaft device, characterized by, It comprises the locking shaft disc (3) arranged between the first shaft flange (1) and the second shaft flange (2) and fixed to the first shaft flange (1) and the second shaft flange (2) by bolts, the fixing base (7) welded to the ship structure on the A side of the second shaft flange (2), the stand column (6) welded to the fixing base (7), the locking block (4) fixed to the stand column (6) by bolts, and the sleeve (9) inserted into the plunger hole of the locking shaft disc (3) from the B side of the first shaft flange (1), the locking block (4) is provided with the telescopic plunger (5), the plunger (5) is aligned with the sleeve (9), the gasket (8) is filled into the welding deformation gap between the locking block (4) and the stand column (6), the sleeve (9) comprises a barrel (91) and a barrel ring (92) folded outward from one end of the barrel (91), when the barrel (91) of the sleeve (9) is inserted into the plunger hole of the locking shaft disc (3), the barrel ring (92) is attached to the B side of the locking shaft disc (3); the thickness of the barrel wall of the barrel (91) is equal to the difference between the plunger hole diameter of the locking shaft disc (3) and the diameter of the plunger (5).

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