JP2002087376A - Davit type boat lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the construction of a davit type boat lifting device. SOLUTION: The davit type boat lifting device 5 comprises a pair of columnar cradles 12 to be turnably connected to a mother ship 1, a hydraulic cylinder 21 for driving the cradles 12 with their turnable ends turned from the inside of the mother ship 1 to the outside, and a pair of wire ropes 7 to be delivered from the turnable ends of the cradles 12. The cradles 12 are turned and a mounted boat 4 lifted via the wire ropes 7 is carried into and out of the mother ship 1. Beam connection beams 13, 14 are provided for connecting the cradles 12 and a pair of hydraulic cylinders 21 are provided in parallel to the cradles 12 so that the hydraulic cylinders 21 sufficiently extending in a turned condition can support the cradles 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a davit type lifting device for carrying a rescue boat or a high-speed suspension or the like and carrying it into and out of a mother ship.

[0002]

2. Description of the Related Art A davit-type lifting device is provided with a structure called a davit that rotates with respect to a mother ship, and a mounted suspension suspended via the davit is discharged from the mother ship to the sea. . As this conventional structure, for example, there is the following.

[0003] A davit is provided with a pair of columns called cradles whose base ends are rotatably supported on a deck, and a pair of hydraulic cylinders between each cradle and the deck.

As a davit, a connecting beam for connecting a pair of cradles is provided, and one hydraulic cylinder is provided between the center of the connecting beam and the deck.

[0005] In any of the conventional structures described above, by extending the hydraulic cylinder, each davit is driven from a retracted position where it fits on the deck to a swinging position where its rotating tip protrudes above the sea.

[0006]

However, in the conventional structure, it is necessary to precisely extend and retract the hydraulic cylinders in a precise manner, and there is a problem that the hydraulic circuit becomes complicated.

Further, in the conventional structure, when a large load acts on one of the wire ropes, the davit may be deformed. To cope with this, it is necessary to provide a stress wire rope or a piston cylinder that is stretched between each cradle and the deck in a state where the davit is in the swinging position, and the provision of these components complicates the lifting device. There was a problem.

The present invention has been made in view of the above problems, and has as its object to simplify the structure of a davit type lifting apparatus.

[0009]

According to a first aspect of the present invention, there is provided a pair of columnar cradles rotatably connected to a mother ship, and each of the cradles is driven such that a tip end of the rotation is swung from the mother ship. A davit type lifting device that includes a hydraulic cylinder and a pair of wire ropes that are unreeled from the rotating tip of each cradle, and rotates each cradle to carry in and out the loading hangers suspended from each wire rope to the mother ship. Apply.

A beam-shaped connecting beam for connecting each cradle is provided, a pair of hydraulic cylinders are provided alongside each cradle, and the rotating tip of each cradle extends completely in the state of the davit oscillated from the mother ship. In addition, each hydraulic cylinder supports each cradle.

A second invention is characterized in that, in the first invention, one end of each hydraulic cylinder is connected to a connection beam.

[0012] In a third aspect based on the second aspect, the connecting beam includes a joining flange protruding from each cradle;
A beam member passed between the joining flange portions, and one end of each hydraulic cylinder is connected to each joining flange portion.

According to a fourth aspect of the present invention, in the third aspect of the present invention, each of the cradles is provided with a bent portion that bends so as to hold the mounting, and a joining flange portion is formed along each bent portion. And

[0014]

According to the first aspect of the present invention, since the davit is integrated by connecting the cradle by the connecting beam, the hydraulic cylinders extend and contract while synchronizing with each other via the davit. For this reason, it is not necessary to precisely manage the amount of hydraulic oil guided to each hydraulic cylinder, and the hydraulic circuit can be simplified.

When the loads on the wire ropes are different, the hydraulic cylinders that have been fully extended support the cradle with respect to the hull when the davit is in a protruding state, thereby suppressing deformation of the davit. As a result, there is no need to provide a stress wire rope or a piston cylinder stretched between each cradle and the mother ship in the swinging state, and the structure can be simplified.

According to the second aspect of the present invention, since one end of each hydraulic cylinder is connected to the connecting beam, each hydraulic cylinder is crossed without interfering with each cradle when each hydraulic cylinder is extended. The cradle can be arranged side by side in the rotation axis direction, and the lifting device can be made more compact.

According to the third aspect of the present invention, since one end of the hydraulic cylinder is connected to the joint flange projecting from the cradle, the hydraulic cylinder can be disposed close to the cradle, and the load on each wire rope can be increased. Are different from each other, the deformation of the davit can be suppressed.

According to the fourth aspect of the present invention, since the joining flange is formed along the bent portion of the cradle, the rigidity of the cradle is increased by the joining flange, and the weight of the lifting device can be reduced.

[0019]

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

As shown in FIGS. 1-4, the deck 2 of the mother ship 1
On the upper part is provided a suspension 11 on which the loading carriage 4 is mounted, and a davit type lifting apparatus 5 for suspending the loading carriage 4 and carrying in and out.
Is installed.

The lifting device 5 includes a davit 6 oscillated from the deck 2, a hydraulic cylinder 8 for driving the davit 6, a pair of wire ropes 7 drawn out from the rotating tip of the davit 6, and each wire rope 7. And a winch 9 that winds the reel. A ball-shaped hook 19 is connected to the tip of each wire rope 7, and the hook 19 is detachably connected to a joint provided at the front and rear portions of the mounting carriage 4.

The davit 6 has a pair of pillars called cradles 12 whose base ends are rotatably connected to the deck 2, and the wire rope 7 is extended from the rotating tip of each cradle 12. The base end of each cradle 12 is rotatably supported via a pin 15.

The davit 6 has connecting beams 13 and 14 for connecting each cradle 12 in a beam shape.
Are integrated via the connecting beams 13 and 14. One connecting beam 13 connects the tip of each cradle 12, and the other connecting beam 14 connects the middle of each cradle 12.

A pair of hydraulic cylinders 21 are provided between the davit 6 and the deck 2 alongside each cradle 12. Each hydraulic cylinder 21 functions to rotate the davit 6 by the expansion and contraction operation, and also functions to support each cradle 12 with respect to the deck 2 by extending each hydraulic cylinder 21 in the swinging state shown in FIG.

Each hydraulic cylinder 21 has a rod 26 projecting and extending from the cylinder 25 when hydraulic oil is guided from a hydraulic source through a hydraulic pipe (not shown), and the hydraulic oil is returned to the tank. The rod 26 is retracted and contracts.

Each cradle 12 is formed in a U-shape so as to hold the mounting carriage 4. Each cradle 1
2 is a horizontal portion 12 extending in a substantially horizontal direction from the rotation base end portion.
a and an upright portion 1 extending substantially upright from the horizontal portion 12a.
2b, and an inclined portion 12c extending obliquely upward from the upright portion 12b.

As shown in FIG. 1 and FIG.
The joint flanges 3 and 14 are formed by joint flanges 16 and 17 projecting from the side of each cradle 12 and beam members 46 and 47 passed between the joint flanges 16 and 17.
Each of the beam members 46 and 47 is formed in a beam shape having a box-shaped cross section, but is not limited thereto, and a pipe material having a circular cross section may be used.

Each joining flange 17 is provided with each cradle 12
Is formed in a box shape along a bent portion 12d where the upright portion 12b and the inclined portion 12 intersect. The bending stiffness of each cradle 12 is increased by each joint flange portion 17.

Each hydraulic cylinder 21 is provided between the deck 2 and each joint flange portion 17. In each hydraulic cylinder 21, the base end of a cylinder 25 is rotatably connected to the deck 2 via a pin 22, and the distal end of a rod 26 is connected to the joint flange 17 via a pin 23. A bracket 24 for supporting the pin 23 is formed to protrude from each joint flange portion 17.

Each pin 22 serving as a fulcrum of each hydraulic cylinder 21 is disposed on the deck 2 on the inner side of the hull from each pin 15 serving as a fulcrum of the davit 6. This allows
When the hydraulic cylinder 21 is extended, the davit 6 rotates outward of the hull.

As shown in FIG. 3, each hydraulic cylinder 21 is driven to the retracted position by contracting most, and the horizontal portion 12a of each cradle 12 is seated on the receiving member 20 on the deck 2. In this stored state, the hydraulic cylinders 21 are arranged so as to be substantially parallel to the upright portions 12b of the cradle 12.

When the hydraulic cylinders 21 extend to the maximum from the retracted state, as shown in FIG.
Is rotated by the angle θ and is held at the swing position. In this swinging state, the load acting on each cradle 12 is extended to the deck 2 via each hydraulic cylinder 21 extended to the stroke limit.
Act on.

At the side of each cradle 12 are four pulleys 3
1 to 34 are attached. Each wire rope 7 is wound around each pulley 31 to 34 so that each cradle 12
It is arranged along.

One of the wire ropes 7 drawn out from the winch 9 is guided to pulleys 34 attached to the base end of the cradle 12 via pulleys 27 and 28 attached to the deck 2. The other wire rope 7 unreeled from the winch 9 is a pulley 2 mounted on the deck 2.
It is guided via 9, 30, 35 to a pulley 34 attached to the pivoting base end of the cradle 12.

Each of the pulleys 34 attached to the rotation base end of the cradle 12 is offset from the pin 15 serving as the center of rotation of the cradle 12 so as to be closer to the pulleys 27 and 35 on the deck 2. This prevents the wire rope 7 from being pulled into the pulley 31 while the davit 6 rotates from the swing position to the storage position.

The pulley 31 provided at the tip of the cradle 12 is provided with a bearing 41 so that it can swing with respect to the cradle 12.
Supported through. This prevents the wire rope 7 from rubbing against the groove of the pulley 31 when the suspended mounting 4 swings.

The operation of the embodiment of the present invention configured as described above will now be described.

As shown in FIG. 3, the davit 6 is seated on the receiving member 20 in the retracted state in which the hydraulic cylinders 21 are in the most contracted state, and the mount 4 is lowered onto the rest 11 on the deck 2. In this retracted state, the davit 6 is arranged so as to hold the mounting 4, and the hydraulic cylinders 21 are arranged so as to be arranged beside the upright portion 12 b of each cradle 12, so that the installation space for the lifting device 5 is set. Can be reduced.

When the hydraulic cylinders 21 extend to the maximum from the retracted state, as shown in FIG.
Is held at the swinging position rotated by the angle θ. In this swinging state, the suspended carrier 4 is separated from the side of the ship 3 to the outside, and the carrier 4 can be lifted and lowered at sea. Also, when loading and unloading cargo from the deck 2 to the loading carriage 4,
The tilt angle of the davit 6 is adjusted so that the mounting carrier 4 abuts against the side 3 of the mother ship 1.

Since the cradle 6 is integrated by connecting the cradle 6 with the connecting beams 13 and 14, the hydraulic cylinders 21 extend and contract while synchronizing with each other via the davit 6. For this reason, it is not necessary to precisely control the amount of hydraulic oil guided to each hydraulic cylinder 21, and the hydraulic circuit can be simplified.

In the swinging state, the load acting on each cradle 12 acts on the deck 2 via each hydraulic cylinder 21 extended to the stroke limit. For this reason, when a large load acts on one of the wire ropes, each hydraulic cylinder 21 in the fully extended state supports each cradle 12 with respect to the deck 2, and the deformation of the davit 6 is suppressed. As a result, there is no need to provide a stress wire rope or a piston cylinder that is stretched between each cradle 12 and the deck 2 in the swinging state, and the structure can be simplified.

Each hydraulic cylinder 21 is connected to the connecting beams 13, 1
Due to the structure interposed between 4 and deck 2, each hydraulic cylinder 21 is arranged before and after each cradle 12, and crosses each cradle 12 without interference when each hydraulic cylinder 21 is extended. As a result, each hydraulic cylinder 21 can be arranged close to the cradle 12, and the lifting device 4 can be made compact.

The structure in which one end of the hydraulic cylinder 21 is connected to the joining flange portion 17 protruding from the cradle 12 enables the hydraulic cylinder 21 to be arranged close to the cradle 12, and the load on each wire rope 7 is reduced. The deformation that occurs in the davit 6 when different from each other can be suppressed.

Since the joining flange 17 is formed along the bent portion 2d, the rigidity of the cradle 12 is increased by the joining flange 17, and the weight of the lifting device 4 can be reduced.

It is apparent that the present invention is not limited to the above-described embodiments, but can be variously modified within the scope of the technical idea.

[Brief description of the drawings]

FIG. 1 is a plan view of a davit type lifting device showing an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a front view in the same storage state.

FIG. 4 is a front view in a swinging state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mother ship 2 Deck 4 Loading 5 Lifting device 6 Davit 7 Wire rope 9 Winch 12 Cradle 12d Bending part 13 Connecting beam 14 Connecting beam 17 Joining flange part

Claims (4)

[Claims] 1. A pair of column-shaped cradles rotatably connected to a mother ship, a hydraulic cylinder for driving each of the cradles so that a tip of the cradle protrudes from the mother ship, and a rotation of each of the cradles. A pair of wire ropes fed from a moving tip portion, a davit type lifting device that rotates each of the cradles and carries in / out a loaded suspension suspended on each of the wire ropes to / from the mother ship. A beam-shaped connecting beam is provided. A pair of the hydraulic cylinders are provided alongside the cradle. A davit-type lifting device characterized by supporting. 2. The davit type lifting device according to claim 1, wherein one end of each of the hydraulic cylinders is connected to the connection beam. 3. The connecting beam includes a joining flange protruding from each of the cradles, and a beam member passed between the joining flanges, and one end of each of the hydraulic cylinders is connected to each of the joining flanges. The davit type lifting device according to claim 2, wherein: 4. The davit according to claim 3, wherein a bent portion is formed in each of the cradles to bend so as to hold the mounting member, and the joining flange portion is formed along each of the bent portions. Type lifting equipment.