JPH08192789A - Maintenance inspection method of propelling device of ship - Google Patents

Abstract

PURPOSE: To perform an inspection and maintenance of a propelling device while a ship is put still in a floating condition. CONSTITUTION: A part of a ship's bottom structure 1 is composed of a frame 3 being a support structure of a turning type propelling device 4. A sealing part to block up a clearance between a ship's bottom opening 2 and the frame 3 arranged in the ship's bottom structure 1 is positioned above a full load draft line WL. A hatch 6 is arranged on an upper deck 5 in response the frame 3. A hook 33 from a crane is hooked on a slinging work wire rope 32 extended over the frame 3. The frame 3 and the turning type propelling device 4 are suspended outside of a ship through the hatch 6 still in an integrated condition. Inspection and maintenance work of the turning type propelling device 4 is performed outside of the ship.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for maintaining and inspecting a propulsion device for a ship, which enables the propulsion device mounted on the ship to be carried out and maintained.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional propulsion device for a ship, which is inserted into a stern tube b as a protection tube at the stern portion a of the ship and the inner surface of the stern tube b. A propeller shaft c, which is rotatably supported by a stern tube bearing fixed to the ship, is arranged in the fore and aft direction of the propeller shaft c.
The propeller d is attached to the rear end of the main engine e, and the front end of the propeller shaft c is connected to the rear end of the intermediate shaft f whose front end is connected to the main engine e installed on the hull. The power is transmitted to the propeller shaft c through the intermediate shaft f and the propeller d
And a sealing device g for closing the gap between the inner peripheral surface of the stern tube b and the outer peripheral surface of the propeller shaft c at the rear end of the stern tube b to prevent water from entering the interior of the ship. It is configured to do so. In the figure, h is a speed reducer attached to the output system of the main engine e, and i is a rudder.

Conventionally, in the above-mentioned propulsion device of a ship, a large-scale inspection work or maintenance work, such as checking the wear state of the propeller shaft c, is carried out instead of the routine maintenance work. As a more used method, first, dismantle the propulsion device and take out the target member, then perform the necessary work,
Inspect the propeller shaft c and if it is worn, repair it or replace it with a new one.
After completing a series of operations, the propulsion device is reassembled.

[0004]

However, in the case of the above-mentioned conventional method, the shaft system such as the stern tube b, the propeller shaft c and the intermediate shaft f and the propeller d are located below the full load waterline WL of the ship. And the sealing device g is the stern tube b.
Since it is provided at the rear end of the ship, it is necessary to mount the ship on the inside of the dog when carrying out inspection work or maintenance work of a large-scale propulsion device that involves dismantling work. Therefore, there is a problem that the period and cost for performing the inspection work and the maintenance work are significantly increased.

[0005] Therefore, the present invention is directed to a ship which allows the propulsion device to be inspected and maintained while the boat is in a floating state without the need to mount the ship, thereby eliminating the need to mount the ship in the dog. It is intended to provide a maintenance and inspection method for propulsion devices.

[0006]

In order to solve the above-mentioned problems, the present invention provides a ship bottom opening of a required size in a part of the ship bottom structure of the stern in advance, and inserts it into the ship bottom opening to insert the ship bottom. The structure, which is a part of the structure, can be detachably fixed to the peripheral edge of the bottom opening of the ship through a sealing material, and rotational power is applied to the propeller shaft from the input shaft that is detachably connected to the main engine. The propeller mounted at the rear end of the propeller shaft is transmitted to generate a propulsive force, and the propeller is supported by a turning propulsion device which is horizontally turned by a turning drive device and steered. The seal part with the ship bottom structure is located above the full load water line of the ship,
Furthermore, a hatch is provided on the upper deck, and the above-mentioned frame and the swing-type propulsion device are carried in and out through the hatch on the upper deck, and maintenance inspection of the propulsion device of the ship is carried out outside the hull. Let's do it.

[0007]

[Operation] When the seal portion that closes the gap between the frame and the bottom opening of the ship is positioned above the full load waterline of the ship, the frame and the swing-type propulsion device are suspended from the inside of the hull with the ship in a floating state. It can be carried out, and even if an opening is made in the bottom structure at this time, it will not be flooded inside the ship. In addition, since the inspection and maintenance work of the swivel-type propulsion device can be performed outboard, a suitable working environment can be secured.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of a maintenance / inspection method for a propulsion device for a ship according to the present invention, in which a ship bottom opening 1 having a required size and shape is previously formed in a ship bottom structure 1 at the stern. A frame 3 (column) having a size and shape capable of entering the ship bottom opening 2 and closing the ship bottom opening 2 is incorporated into the ship bottom opening 2 to form a part of the ship bottom structure 1. , The upper end of the joint between the frame 3 and the bottom opening 2 is located above the full load water line WL of the ship,
As a propulsion device for a ship, a swivel-type propulsion device 4 equipped with a contra-rotating propeller device is assembled to the frame 3 to form a block, which is mounted inside the ship. A hatch 6 having a size that allows the frame 3 and the swivel-type propulsion device 4 to integrally pass therethrough is provided on an upper deck 5 located directly above the propulsion device 4.

As shown in the enlarged view of FIG. 3, the joint between the ship bottom opening 2 and the frame 3 is such that the flange 7 formed at the upper end of the frame 3 covers the surrounding ship bottom structure 1. By detachably fixing the flange portion 7 to the peripheral portion of the bottom opening 2 of the bottom structure 1 with a bolt 8, the frame 3 incorporated in the bottom opening 2 is supported by the whole bottom structure 1, and A seal ring 9 is installed between the flange portion 7 and the ship bottom structure 1 along the periphery of the ship bottom opening 2, and the seal part formed by the seal ring 9 is positioned above the full load water line WL of the ship. It is designed to be. At the upper end of the frame 3, a required number of suspension pieces 10 for hanging a wire rope for slinging are provided at appropriate intervals.

Further, as shown in FIG. 4, the turning propulsion device 4 equipped with the above-mentioned counter-rotating propeller device constitutes a part of the bottom structure 1 of the stern and has the turning propulsion device 4 inside the ship. Opening 3a in the frame 3 that will be the support structure for mounting
Bearing 12 in which the upper end of a strut 11 vertically arranged through the opening 3a is installed on the periphery of the opening 3a.
And a ring gear 13 mounted on the outer peripheral surface of the upper end of the strut 11 and rotatably supported by the frame 3, and a pinion mounted on the output shaft of the swing drive device 14 disposed on the frame 3 and the frame 3. 15 and the lower end of the strut 11 has a propeller pot 16
The outer propeller shaft 17a rotatably supporting the outer propeller shaft 17a having a front propeller 18a attached to the rear end inside the propeller pot 16 while supporting the outer propeller shaft 17a.
An inner propeller shaft 17b having a rear propeller 18b attached to the rear end thereof is concentrically inserted therein, and is rotatably supported by a propeller pot 16 so that the two propeller shafts 17
bevel gears 19a fixed to the front ends of a and 17b,
19b and a bevel gear 21 fixed to the lower end of a vertical shaft 20 rotatably supported in the strut 11 are engaged with each other, and power from a main engine 22 of the ship is passed through the vertical shaft 20 and two propellers. Front propeller 1 transmitted to shafts 17a and 17b and attached to outer propeller shaft 17a
8a and the rear side propeller 18b attached to the inner propeller shaft 17b form a contra-rotating propeller device in which the propeller device is rotated in opposite directions. The propellers 18a and 18b are freely turned in a horizontal plane to steer the ship.

As a mechanism for transmitting the power from the main engine 22 to the vertical shaft 20, an input shaft 24 housed in a housing (gear casing) 23 and an intermediate shaft 25 having a front end connected to the main engine 22. Are detachably connected via a flange 26, and a bevel gear 28a for forward rotation is provided at one end on the outside of the input shaft 24, and the inner diameter is slightly larger than the outside of the input shaft 24 for forward rotation. A hollow shaft 27a for reverse rotation, which includes a hollow shaft 27a and a bevel gear 28b for reverse rotation at one end.
b so that the bevel gears 28a and 28b face each other, and the hollow shafts 27a and 27b are loosely fitted to the input shaft 24 so that they are rotated concentrically with the input shaft 24. The bevel gears 28a and 28b of the two hollow shafts 27a and 27b are supported by the bearings 29a and 29b and meshed with the bevel gear 30 attached to the upper end of the vertical shaft 20.
A forward rotation clutch 31a is provided between the outer circumferential surface of the input shaft 24 and the inner circumferential surface of the forward rotation hollow shaft 27a, and a forward rotation clutch 31a is provided between the outer circumferential surface of the input shaft 24 and the reverse rotation hollow shaft 27b. A reverse rotation clutch 31b is interposed between the two, and two clutches are simultaneously inserted between the forward rotation clutch 31a and the reverse rotation clutch 31b so that the two hollow shafts 27a and 27b are integrated with the input shaft 24 at the same time. An interlock mechanism is provided to prevent this from happening, and when one clutch is engaged, the other clutch is disengaged and is in an idle state.

In order to operate the turning type propulsion device 4 to propel the vessel forward, the forward rotation clutch 31a is first put in the state in which the reverse rotation clutch 31b is disengaged to turn on the power of the main engine 22. The outer propeller shaft 1 is transmitted to the vertical shaft 20 via the intermediate shaft 25, the input shaft 24, the hollow shaft 27a for forward rotation, the bevel gear 28a, and the bevel gear 30 at the upper end of the vertical shaft 20.
7a and the inner propeller shaft 17b are rotated in opposite directions to invert the front propeller 18a and the rear propeller 18b to generate a propulsive force for advancing the vessel. At this time, the propulsion performance of the ship can be improved by equipping the contra-rotating propeller device.

On the other hand, when changing the course of a ship,
By rotating the strut 11 by the turning drive device 14, the front and rear propellers 18a and 18b can be horizontally swung to maneuver in any direction, and when the ship is to be propelled backward, the propeller 18a , 18b
May be rotated 180 degrees, or the reverse rotation clutch 31b may be inserted after the forward rotation clutch 31a is disengaged so that the power from the main engine 22 passes through the reverse rotation hollow shaft 27b and the bevel gear 28b. When the vertical shaft 20 is transmitted to the bevel gear 30 at the upper end of the vertical shaft 20, the vertical shaft 20 is rotated in the direction opposite to the rotation direction when the marine vessel is moved forward, and the marine vessel can be moved backward.

After carrying out the operation of the propulsion device of the ship as described above, when the maintenance and inspection work of the swivel-type propulsion device 4 installed in the ship is to be carried out, the main engine is in a state where the ship is in a floating state. The operation of 22 is stopped, the wire rope 32 for slinging is hung over the hanging piece 10 provided at the upper end of the frame 3, and then the hook 33 is passed through the hatch 6 from above the upper deck 5 by a crane (not shown). Hang it,
The hook 33 is hooked on the wire rope 32 for hanging. In parallel with or after such work, the flange 26 connecting the input shaft 24 and the intermediate shaft 25 is cut off, and the bolt 8 for fixing the flange portion 7 at the upper end of the frame 3 to the hull structure 1 is removed. The frame 3 and the swivel-type propulsion device 4 supported by the frame 3 are removed so as to be in a state of being divided from the hull side, and thereafter, the hook 33 is wound up by a crane to be shown by a chain double-dashed line in FIG. As described above, the frame 3 and the swivel-type propulsion device 4 are hung as an integrated block and carried out of the ship, and are transported to a work place outside the hull where the swivel-type propulsion device 4 is inspected and maintained.

In the above description, since the seal ring 9 as a seal portion arranged between the ship bottom structure 1 and the frame 3 is located above the full load waterline WL of the ship, the ship is in a levitating state. Even if the frame 3 and the swivel-type propulsion device 4 are suspended from the ship, they will not be flooded into the ship, and large-scale inspection work and maintenance of the swivel-type propulsion device 4 with the ship left in a floating state. The work can be easily performed, and the repair work of the frame 3 can be performed at the same time. Further, since the work is performed outboard, a suitable work environment can be easily provided. Can be secured.

On the other hand, the swivel-type propulsion device 4 which has been inspected and maintained.
In order to incorporate the above into the inside of the hull, contrary to the above-mentioned procedure, the ship bottom in which the frame 3 and the swing-type propulsion device 4 integrated by the crane are provided in the ship bottom structure 1 through the hatch 6 of the upper deck 5. After suspending in the opening 2, the flange portion 7 at the upper end of the frame 3 is fixed to the ship bottom structure 1 by the bolt 8, and the input shaft 24 and the intermediate shaft 25 are connected to the flange 26.
It should be connected by.

As shown by the alternate long and short dash line in FIG. 1, a hatch 34 is provided on the upper deck 5 above the main engine 22, and the hatch 34 is laid over the main engine 22 in the same manner as in the case of the frame 3 and the turning type propulsion device 4. When the hook 36 is hooked on the wire rope 35 for slinging and is wound up by the crane, the main engine 22
Can be carried out of the ship through the hatch 34.

The present invention is not limited to the above-described embodiment. For example, the case where the turning propulsion device 4 equipped with a contra-rotating propeller device is applied as a propulsion device for a ship is shown. It is needless to say that the turning propulsion device 4 including only one propeller may be used in place of the double inversion propeller device, and various changes may be made without departing from the scope of the present invention. .

[0020]

As described above, according to the maintenance / inspection method for a propulsion device for a ship of the present invention, a support structure that constitutes a part of the bottom structure of the stern and is used when the turning propulsion device is mounted in the ship. The seal part that closes the gap between the frame structure that is to be installed on the ship bottom structure and the bottom opening that is provided to incorporate the frame structure into the ship bottom structure is located above the full load waterline of the ship, and the required size on the upper deck. Since a hatch is provided and the frame and the swing-type propulsion device are hung outside the ship as a block through the hatch to perform the inspection and maintenance work of the swing-type propulsion device, the frame and the swing-type propulsion device are put outboard. Even if the ship is lifted up and an opening is made in the ship bottom structure, it will not be flooded into the ship.Therefore, it will be possible to carry out inspections and maintenance work of the swing-type propulsion device while the ship is in a floating state. Protection It unnecessary to Ueka in dog vessels can reduce the cost and time for,
Further, it is possible to perform the inspection and maintenance work in a suitable working environment outside the ship, and it is possible to perform the inspection and maintenance with high accuracy, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a maintenance / inspection method for a marine vessel propulsion device according to the present invention.

FIG. 2 is a view taken along line II-II in FIG.

FIG. 3 is an enlarged view of a part III in FIG.

FIG. 4 is a sectional view showing an example of a turning type propulsion device equipped with a contra-rotating propeller device.

FIG. 5 is a schematic view showing an example of a conventional ship propulsion device.

[Explanation of symbols]

 1 Ship Bottom Structure 2 Ship Bottom Opening 3 Frame 4 Swing Propulsion Device 5 Upper Deck 6 Hatch 9 Seal Ring (Seal) 10 Suspension Piece 14 Swing Drive Device 17a Outer Propeller Shaft 17b Inner Propeller Shaft 18a Front Propeller 18b Rear Propeller 22 Main Engine 24 Input Shaft 32 Wire Rope 33 Hook

Claims (1)

[Claims] 1. A structure in which a required size of a ship bottom opening is provided in advance in a part of the ship bottom structure of the stern, and a frame which is inserted into the ship bottom opening to be a part of the ship bottom structure is provided on the peripheral edge of the ship bottom opening. By making it possible to detachably fix it through a sealing material and transmitting rotational power from the input shaft detachably connected to the main engine to the propeller shaft to rotate the propeller attached to the rear end of the propeller shaft. A swivel propulsion device that generates a propulsive force and horizontally swivels the propeller by a swivel drive device is steered is supported, and the seal portion between the frame and the ship bottom structure is located above the full load waterline of the ship. age,
Furthermore, a hatch is provided on the upper deck, and the above-mentioned frame and swing-type propulsion device are carried in and out through the hatch on the upper deck, and maintenance and inspection of the propulsion device of the ship is carried out outside the hull. Method.