JP2001026393A - Deck crane device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small and light deck crane that can reliably sling and stow onboard craft while occupying a reduced area on decks. SOLUTION: An upright mast 4 on a deck 10 carries a post 5 turnable thereabout. The post 5 carries a fixed boom 6 having a winch and a wire rope 81. On the opposite sides of the boom 6 are hydraulic cylinders 71 and 73 for alternately pulling a wire rope 43 wound on a swing sheave 41 on the top of the mast 4. The swing sheave 41 has means for securing the wire rope 43 halfway.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved deck crane for suspending and recovering a boat mounted on a mother ship.

[0002]

2. Description of the Related Art Conventionally, a deck crane has been employed as a device for suspending or recovering a small boat mounted on a mother ship to the sea.

In this deck crane, a boom provided with a top sheave for suspending a boat mounted on a deck, and a turning device for turning the boom are provided. As the turning device, a gear provided on the boom side is provided with a hydraulic motor. In general, the boom is turned by the rotation of a hydraulic motor.

[0004]

However, in the above-mentioned conventional example, a gear mechanism for turning the boom side must be provided at a lower portion of the deck crane or the like. In addition to the problem that the available area of the vehicle is reduced, the weight of the device is increased by the gear mechanism, which is not suitable for a ship in which the navigation speed is important.

The present invention has been made in view of the above-mentioned problems, and a small and lightweight deck crane capable of reliably suspending and accommodating a mounted boat while suppressing the occupied area of the deck. The purpose is to provide.

[0006]

SUMMARY OF THE INVENTION A first aspect of the present invention is a deck crane having a boom installed on a deck of a ship and capable of turning, a winch for suspending a mounted boat on the sea surface or on the deck, and a wire rope. , A rotatable cylindrical member is disposed around the outer periphery of a columnar member erected on the deck, and a boom provided with a winch is fixed to the cylindrical member, and the columnar member is provided on both side surfaces of the boom. An actuator is provided for alternately pulling a second wire rope wound around a guide member provided on an upper portion of the member, and the guide member is provided with a means for fixing a middle of the second wire rope.

In a second aspect based on the first aspect, the guide member locks the middle of the second wire rope, and the actuator comprises a pair of hydraulic cylinders. Attach both ends of the wire rope to the piston rod of the hydraulic cylinder, respectively.

According to a third aspect of the present invention, in the first aspect of the present invention, an extendable / removable stabilizer is interposed between the boom and a boat suspended on a winch.

In a fourth aspect based on the first aspect, the top sheave is supported so as to be rotatable around an axis of the boom.

In a fifth aspect based on the first aspect, the winch comprises a hydraulic motor directly connected to a drum for winding a wire rope and a flow rate of hydraulic oil supplied to the hydraulic motor in a stepwise manner. An increasing / decreasing speed adjusting means is provided.

In a sixth aspect based on the second aspect, the hydraulic cylinder is provided with a plurality of hydraulic pressure sources, and the speed of expansion and contraction of the piston rod is adjusted stepwise according to the number of hydraulic pressure sources to be operated. Change to

[0012]

Therefore, the first and second inventions are as follows.
The boom provided with the winch is coupled to the cylindrical member, and can be pivoted about a columnar member erected on the deck, and a guide member for guiding the second wire rope is fixedly mounted on the columnar member. Since the second wire rope wound around the guide member is locked to the guide member by the fixing means, both ends of the second wire rope are alternately pulled by actuators provided on both side surfaces of the boom. And, the boom can be swung in the pulled direction, and the boat suspended by the winch can be moved between on the deck and on the sea surface. The deck crane can be made smaller and lighter than when turning the boom, increasing the available area on the deck and reducing the weight of the deck crane. It is possible to sailing speed improve.

According to a third aspect of the present invention, the suspended boat is suspended by a single wire rope from a winch. The distance between the boat and the boom is appropriately adjusted by a stabilizer provided in the middle of the boom. This prevents the suspended boat from rotating or swinging and coming into contact with the mother ship's hull and outfittings.Because the stabilizer is removable, after landing on the sea surface, remove the stabilizer and navigate. can do.

According to the fourth aspect of the present invention, since the top sheave is rotatable around the boom axis, when the suspended boat swings, the top sheave also swings and follows the movement of the wire rope. can do.

According to a fifth aspect of the present invention, the flow rate of hydraulic oil supplied to the hydraulic motor of the winch is increased or decreased stepwise,
It can be adjusted to a desired elevating speed, and in particular, by lowering the elevating speed when the boat is drained, the impact at the time of draining can be suppressed.

According to the sixth aspect of the present invention, the expansion and contraction speed of the hydraulic cylinder can be changed according to the number of hydraulic supply sources to be operated.
By reducing the speed at the start or end of the turn and increasing the speed during the turn, the boat can be moved quickly while facilitating positioning and the like.

[0017]

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

FIGS. 1 to 3 are a side view, a plan view, and a perspective view of a ship showing an example of a deck crane to which the present invention is applied. 3 is installed, and on the deck 10 is also mounted a boat 2 accommodated by the deck crane 3.
It is placed via 2 and 12.

1 and 2, the deck crane 3 is a mast 4 (a columnar member) erected on a deck 10.
A post 5 of a cylindrical member is pivotably supported, and a boom 6 is fixed to the post 5.

The boom 6 is provided with a winch 8 for lifting and lowering a wire rope 81 for suspending the boat 2, and a turning device 7 for turning the boom 6 within a predetermined range. In this example, as shown in FIG. 2, the turning range of the boom 6 is set to about 90 degrees, and
Is turned to a position where it can ascend and descend from the deck 10 to the sea surface on the side of the shore 11.

The mast 4 has a swivel sheave 41 (guide member) constituting the swivel device 7 fixed to an upper portion thereof, and has a cylindrical shape on the outer periphery of the side surface through bearings 52, 52 as shown in FIG. Is supported so as to be pivotable about the axis C.

As shown in FIG. 1, a boom 6 is connected to an upper portion of the post 5 through a bracket 50 projecting outward, and the tip of the boom 6 extends almost to the center of the mounted boat 2. Is done. The boom 6 is coupled to the bracket 50 by a reamer bolt 51 or the like, and is supported so as to be able to pivot around the mast 4 together with the post 5.

On the other hand, on the lower surface of the boom 6, an extendable / removable stabilizer 9 connected to the stern side of the mounted boat 2 is provided. When the mounted boat 2 is being lifted, the stabilizer 9 will be described later. By making such adjustment, unnecessary swinging of the mounted boat 2 is prevented.

On the side surface of the boom 6, there is provided a hydraulic unit 30 which accommodates a turning hydraulic device 13 for supplying hydraulic pressure to the turning device 7 and the winch 8 and a lifting hydraulic device 14, respectively.

First, the winch 8 provided on the upper surface of the boom 6
Is composed of a drum 80 capable of winding one end of a wire rope 81 and a hydraulic motor 85 for driving the drum 80. The drum 80 and the hydraulic motor 85 are directly connected without a reduction gear. .

The wire rope 81 is connected to the boom 6
The hook 82 suspends the mounted boat 2 via a ring 84 at the tip of the wire rope 81 as shown in FIG. 7, and the hook 82 is attached to the top sheave 61 at the tip of the wire rope 81. A stopper 83 is provided to prevent entanglement.

At the tip of the boom 6, as shown in FIG.
A case 62 in which a top sheave 61 is housed is supported so as to be rotatable around the axis of the boom 6.

A top sheave 61 for guiding the wire rope 81 is supported by a shaft inside a case 62, and a shaft 63 is formed in the case 62. The shaft 63 is open at the end face of the boom 6. The top sheave 61 is rotatable around the axis of the boom 6 by being supported by the portion 64.

Therefore, when the mounted boat 2 suspended on the wire rope 81 swings, the top sheave 61
By rotating around the axis of the boom 6, the movement of the wire rope 81 can be followed.

An opening 62B through which the wire rope 81 is inserted is formed in the lower surface 62A of the case 62. When the stopper 83 comes into contact with the lower surface 62A provided with the opening 62B, the hook 82 is excessively raised. Regulate.

As shown in FIG. 3, a plurality of wire ropes 22 connected to the suspenders 21 of the boat 2 are connected to the ring 84 suspended from the hooks 82.
The load of the mounted boat 2 is supported by one wire rope 81.

Since the mounted boat 2 is suspended at one point by the deck crane 3, one end of a stabilizer 9 provided on the lower surface of the boom 6 is attached to the stern to prevent the boat 2 from swinging or rotating during elevating or turning. To the side.

Here, the stabilizer 9 is configured as shown in FIG. 6, and includes a double pulley 91 connected to the boom 6 side, and a suspension
Double pulley 9 connected to a suspender 24 provided on the stern side of the vehicle
2 and a rope 93 connecting these double pulleys 91 and 92
The mounted boat 2 is suspended by a wire rope 81 at a substantially central portion thereof, and is connected by connecting the stern side and the lower surface of the boom 6 with a rope 93, and the length of the rope 93 is adjusted. Unnecessary rotation and swing during lowering are prevented, and contact with the hull 1 of the mother ship is prevented.

For this reason, the double pulley 92 on the boat 2 side is
A hook 95 for connecting to the suspender 24 and the like, and a rope 9
And a lock mechanism 94 for locking the length of the rope 93 at an arbitrary position. The lock mechanism 94 is, for example, one in which a rope 93 is inserted between a pair of biased wedges.
In the state where the tension is not applied, the length of the rope 93 from the double pulley 91 on the lower surface of the boom 6 to the mounted boat 2 is adjusted to an arbitrary length. Is held.

Next, a turning device 7 for turning the boom 6 between the deck 10 and the sea surface protruding from the side of the shore 11 will be described with reference to FIGS.

First, as shown in FIGS. 2 and 3, the turning device 7 includes a pair of hydraulic cylinders 71 and 73 provided on both side surfaces of the boom 6 and a pair of hydraulic cylinders 71 and 73 connected to the hydraulic cylinders 71 and 73. The wire rope 43 and the revolving sheave 41 fixed to the upper part of the mast 4 to lock the wire rope 43 in the middle and wind the wire rope 43 can be formed.

In FIG. 2, a hydraulic cylinder 71 is disposed on the side surface of the boom 6 facing the center side (upward in the figure) of the hull 1 and supported at the base end, while the hydraulic cylinder 73 is
The base end is supported by the side surface of the boom 6 facing the side of the hull 1 on the side of the ship 11 (downward in the figure).

The hydraulic cylinders 71 and 73 are provided with the piston rods 72 and 74 facing the turning sheave 41 on the mast 4 side, respectively.
The ends of the wire rope 43 wound around the revolving sheave 41 are respectively connected to the ends of 74.

On the other hand, as shown in FIGS. 4 and 5, a notch 42 is formed in the swiveling sheave 41 around which the wire rope 43 is wound, and the notch 42 is fixed in the middle of the wire rope 43. The collar 44 is housed.
That is, in the middle of the wire rope 43, the collar 44 is locked to the notch 42 and fixed to the turning sheave 41.

The revolving sheave 4 provided with the notch 42
1, a holder 45 formed by bending a plate-like member is fastened to prevent the collar 44 from falling out of the notch 42.
The middle of the wire rope 43 is securely connected to the turning sheave 41.

Accordingly, the boom 6 is connected to the post 5 and is pivotable with respect to the mast 4, while the wire rope 4 is connected at both ends to the piston rods 72, 74.
3 is connected to the turning sheave 41 in the middle,
By expanding and contracting the piston rods 72, 74 of the hydraulic cylinders 71, 73 provided on both side surfaces of the boom 6, the boom 6 can turn according to the tension applied to the wire rope 43.

For example, in FIG. 2, while the hydraulic cylinder 73 on the side of the boat 11 is contracted, the hydraulic cylinder 7 on the opposite side is contracted.
As shown in FIG. 5, when the swinging sheave 41 is extended, the middle of the turning sheave 41 is fixed to the turning sheave 41, so that the tension of the wire rope 43 on the side of the shore 11 increases, and the boom 6 It can turn clockwise in the figure.

As shown in FIG. 8, springs 75, 75 for urging the piston rods 72, 74 in the contracting direction are housed inside the hydraulic cylinders 71, 73.
After the turning hydraulic device 13 stops, the boom 6 can be fixed at an arbitrary turning position by the respective piston rods 72 and 74 pulling the wire rope 43.

Here, the turning hydraulic device 13 for driving the hydraulic cylinders 71 and 73 will be described with reference to the circuit diagram of FIG.

First, the hydraulic cylinders 71, 73 are defined with contracting oil chambers 71a, 73a accommodating a spring 75 and extending oil chambers 71b, 73b. 73b are connected to each other through a communication passage 120, while the contraction-side oil chamber 71a is
3 is connected to the oil passage 112, and also the contraction side oil chamber 73a.
Is connected to the oil passage 113.

First to fourth hydraulic units 101 to 104 are disposed in the oil passages 112 and 113, and each hydraulic unit sequentially operates in response to a command from the control device 31 (see FIGS. 2 and 3). The boom 6 is started up and stopped sequentially at the end of turning to control the turning speed of the boom 6 in multiple stages. Since the hydraulic units 101 to 104 have the same configuration, only the hydraulic unit 101 will be described below.

In FIG. 8, the oil passages 112 and 113 are connected to the motor pump 1 via slow return valves 116 and 117 and operating check valves 114 and 115, respectively.
10 and the electromagnetic directional control valve 111. The oil passages 112 and 113 and the motor pump 110 are connected to the oil passage 1
The motor pump 110 is provided with a motor (not shown) and rotates forward or backward to supply hydraulic pressure to one of the oil passages 112a and 113a. A normally closed manual valve 119 is interposed between the oil passages 112 and 113 for maintenance or the like.

The electromagnetic directional control valve 111 switches the three positions L, S, and R in the figure. At the position L in the figure, the tank 118 communicates with the oil passage 113 while the position in the figure R Then, the oil passage 112 is communicated with the tank 118, and the oil passages 112 and 113 are shut off from the tank 118 at the position S in the figure.

Here, the control device 31 controls the switching position of the electromagnetic direction switching valve 111 and the rotation direction of the motor pump 110 in accordance with the turning direction of the boom 6, and for example, in FIG. , The electromagnetic directional control valve 111 is set to the R switching position,
The motor pump 110 is rotated forward.

At this time, the oil passage 112a communicates with the tank 118, and the motor pump 110 connects the oil passage 113a to the oil passage 1
Hydraulic oil is discharged to 13, and the hydraulic pressure causes the operation check valve 114 to open.

The hydraulic oil that has passed through the slow return valve 117 from the oil passage 113 flows into the contraction-side oil chamber 73a of the hydraulic cylinder 73, and contracts the piston rod 74.

Further, due to the contraction of the piston rod 74, the hydraulic oil in the extension-side oil chamber 73b flows into the extension-side oil chamber 71b of the hydraulic cylinder 71 via the oil passage 120, and drives the piston rod 72 to extend. By this extension drive,
Hydraulic oil in the contraction-side oil chamber 71a of the hydraulic cylinder 71 is discharged to an oil passage 112, and further the slow return valve 1
16 and the oil passage 11 through the operation check valve 114
The fluid flows back from 2a to the motor pump 110, and the clockwise turning of the boom 6 is started.

On the other hand, when the boom 6 is turned counterclockwise in FIG. 2, the opposite is the case, and the switching position of the electromagnetic directional control valve 111 is set to the position L shown in FIG. When the motor pump 110 is reversed, the hydraulic cylinder 71 is contracted and driven, while the hydraulic cylinder 73 is driven.
Is driven to extend, and the boom 6 starts turning counterclockwise.

When the motor pump 110 is stopped and the switching position of the electromagnetic direction switching valve 111 is set to S in FIG. 8, the oil passages 112 and 113 are shut off from the tank 118 and the operation check valve 114 and 115
Is closed to seal the hydraulic oil in the hydraulic cylinders 71 and 73, and the boom 6
In its swiveling position.

When the first hydraulic unit 101 is actuated in this way, the boom 6 starts turning in an arbitrary direction,
Thereafter, by sequentially operating the hydraulic units 102, 103, and 104, the turning speed of the boom 6 can be sequentially increased from the first speed to the fourth speed. 104, 103, 10
If the steps 2 and 101 are sequentially stopped, the boom 6 can be stopped smoothly while sequentially reducing the speed from the fourth speed to the first speed.

Next, the lifting hydraulic device 14 for driving the winch 8 will be described with reference to FIG.

The elevating hydraulic device 14 is provided with two hydraulic pumps 132 and 133 driven by a motor 131 and a hydraulic motor 85 for transmitting hydraulic pressure from the hydraulic pumps 132 and 133.
And an electromagnetic direction switching valve 134, 135 for selectively supplying the oil passage 136 and the oil passage 137 communicating with the oil passage 137.
The rotation direction of the drum 80 connected to the hydraulic motor 85 and the elevating speed are controlled. Further, a brake 141 for holding the drum 80 at an arbitrary position and an electromagnetic direction switching valve 140 are also provided.

The hydraulic pump 132 includes the electromagnetic directional control valve 13
4 is connected to the hydraulic pump 133 and the electromagnetic directional control valve 1
35 is connected to these electromagnetic directional control valves 134, 13
Reference numeral 5 selectively controls the three switching positions U, S, and D to control the ascending / descending direction and the speed. The speed is controlled by using the electromagnetic direction switching valve 134 as the first speed, using the electromagnetic direction switching valve 135 as the second speed, and starting the driving of the hydraulic motor 85 by the hydraulic pressure and the flow rate of the hydraulic pump 132.
By adding the oil pressure and the flow rate from the hydraulic pump 133, the elevation speed can be switched between two stages.

First, the electromagnetic directional control valve 1 for controlling the first speed
In the switching position U of FIG. 34, the hydraulic pressure of the hydraulic pump 132 is supplied to the oil passage 136 on the winding side of the hydraulic motor 85, and the pressure oil that has passed through the counterbalance valve 142 is supplied to the drum 80.
In the winding direction of the wire rope 81,
The pressure oil discharged from the hydraulic motor 85 to the oil passage 137 is returned from the electromagnetic directional switching valve 134 to the return oil passage 138 via the relief valve 139, returns to the tank, and is suspended on the wire rope 81. Raise 2.

On the other hand, the switching position D of the electromagnetic directional switching valve 134
Then, the hydraulic pressure of the hydraulic pump 132 is supplied to the oil passage 137 on the delivery side of the hydraulic motor 85, and the counter balance valve 142 is opened according to the oil pressure of the oil passage 137.
By circulating the hydraulic oil in the oil passage 136 from the electromagnetic direction switching valve 134 to the return oil passage 138 via the relief valve 139, the drum 80 is driven at a constant speed in the direction in which the wire rope 81 is fed out, and The suspended mounted boat 2 is lowered.

The switching position S of the electromagnetic directional switching valve 134
Then, the drive of the hydraulic motor 85 is stopped by closing the oil passages 136 and 137, and the pressure oil from the hydraulic pump 132 returns to the return oil passage 138 via the relief valve 139.

When the electromagnetic direction switching valve 135 for the second speed is set to the U or D switching position, the operation is almost the same as that for the first speed, but the hydraulic oil discharged to the tank side passes through the relief 139. The oil can be returned to the return oil passage 138 without any change to allow a large flow rate, and the driving speed of the hydraulic motor 85 can be improved as compared with the first speed.

Therefore, the lifting and lowering of the onboard boat 2 is started slowly at the first speed, and then the lifting and lowering work is performed quickly by setting the speed at the second speed. Then, when stopping, by returning to the first speed again, the mounted boat 2 can be smoothly moved on the deck 10 or on the sea surface.

In particular, when the onboard boat 2 is hoisted or landed, an impact is generated when the bottom of the boat is drained from the sea surface. Therefore, the impact at the time of draining can be reduced by making the ascent / descent speed variable. is there.

The deck crane 3 constructed as described above
The landing or accommodation work of the mounted boat 2 is performed as follows.

First, a description will be given of a case where the mounted boat 2 is caused to land on the sea surface on the side of the side of the boat 11 as shown at 2 'in FIG. 2 from the state of being placed on the deck 10 as shown in FIG.

As shown in FIG. 1, the boat 2 has a deck 10
On the pedestal 12 of the boat, and in this state, the mounted boat 2
The ring 84, through which the wire rope 22 is inserted, is suspended from the hook 82, and the double pulley 92 of the stabilizer 9 is suspended from the suspension 24 of the mounted boat 2 as shown in FIGS.
To complete the boarding of the onboard boat 2. As shown in FIGS. 1 and 3, a rope 2 is
3 is mounted and operated by an operator on the deck 10 of the mother ship.

Next, the lifting of the mounted boat 2 by the winch 8 is started.

The elevating hydraulic device 14 is started, and the electromagnetic directional valves 134 and 135 are sequentially switched to the position U shown in FIG. 9 to start slowly ascending at the first speed and then rapidly ascending at the second speed. When it reaches the specified height,
Return to the first position and stop slowly.

During this ascent, the occupant of the onboard boat 2 operates the stabilizer 9 to contract the rope 93 in accordance with the ascent of the boat, and the onboard boat 2 suspended at one point swings or turns by wind or the like. To prevent Similarly, the worker on the deck 10 also operates the rope 23 connected to the bow side of the mounted boat 2 to suppress the boat from swinging.

Next, the boom 6 is turned by the turning device 7.

When the turning hydraulic device 13 is started, first, the first
The hydraulic pump 101 of the hydraulic unit 101 is operated to switch the electromagnetic direction switching valve 111 to the switching position R shown in FIG.
Start turning.

That is, while the hydraulic cylinder 73 on the side of the shore 11 contracts, the other hydraulic cylinder 71 expands, and the piston rod 74 pulls the wire rope 43, so that the post 5 The boom 6 turns clockwise.

After the first hydraulic unit 101 starts turning at the first speed, the second to fourth hydraulic units 102 to 104 are sequentially operated to change the turning speed from the first speed to the first speed. The speed is increased sequentially to a speed of 4.

During this turning, the occupant of the boat 2 gradually extends the rope 93 of the stabilizer 9 in accordance with the turning, while the worker on the deck 10 pulls the rope 23 on the bow side, as shown in FIG. Then, the mounted boat 2 is rotated counterclockwise to prevent contact with the hull 1 of the mother ship.

When the onboard boat 2 reaches the sea surface on the side of the shore 11, the fourth to second hydraulic units 104 to 102 are sequentially stopped to decelerate, and further reach the position 2 ′ shown in FIG. The first hydraulic unit 101 is also stopped, and the turning is completed.

At the position 2 'on the side of the shore 11 side, the operation of the stabilizer 9 and the operation of the rope 23 cause the onboard boat 2'
Is substantially parallel to the hull 1 of the mother ship, and water landing on the sea surface is performed in this state.

By starting the lifting / lowering hydraulic device 14 and sequentially switching the electromagnetic directional switching valves 134 and 135 to the switching position D shown in FIG. 9, the vehicle starts to descend slowly at the first speed and then at the second speed. When the ship descends quickly and approaches the sea surface, it returns to the 1st speed again and makes it land slowly. Also during this descent, the hull 1 and the mounted boat 2 can be prevented from coming into contact with each other by gradually extending the rope 93 of the stabilizer 9 and the rope 23 on the bow side.

Then, as shown in FIG. 3, the ring 84 is detached from the hook 82 and the double pulley 92 of the stabilizer 9 is detached from the stern side suspender 24, and then the winch 8 is rolled up to mount the boat 2. Navigation begins.

On the other hand, in order to accommodate the mounted boat 2 which has returned to the position 2 'shown in FIG. 2 on the deck 10, ascending and descending and turning are performed in reverse to the above-described landing.

First, the winch 8 is driven and the hook 82
Is lowered, and the ring 84 connected to the wire rope 22
As shown in FIGS. 3 and 6, the hook 9 is attached to the hook 82, the stabilizer 9 with the rope 93 extended is passed to the mounted boat 2, and the hook 95 of the double pulley 92 is attached to the stern side suspender 24. . At the same time, the rope 23 on the bow side of the mounted boat 2 is transferred to the worker on the mother ship deck 10.

Next, the lifting hydraulic device 14 is started, and the electromagnetic directional control valves 134 and 135 are sequentially switched to the switching position U shown in FIG. When the vehicle is quickly lifted at the second speed and reaches a predetermined height, the speed is returned to the first speed again, and then the vehicle slowly stops.
During this ascent, the stabilizer 9 is used in the same manner as during the landing.
The length of the rope 93 and the length of the rope 23 on the bow side are adjusted to prevent the hull 1 and the mounted boat 2 from coming into contact with each other.

Then, the turning hydraulic device 13 is started, the first hydraulic unit 101 is operated, and the electromagnetic direction switching valve 1 is turned on.
By switching 11 to the switching position L shown in FIG. 8, the boom 6 starts turning counterclockwise in FIG.

That is, while the hydraulic cylinder 73 on the side of the shore 11 is extended, the other hydraulic cylinder 71 is contracted, and the piston rod 72 pulls the wire rope 43, so that the post 5 The boom 6 turns counterclockwise.

After the first hydraulic unit 101 starts turning at the first speed, the second to fourth hydraulic units 102 to 104 are sequentially operated to change the turning speed from the first speed to the first speed. The speed is increased sequentially to a speed of 4.

During this turning, the occupant of the onboard boat 2 gradually contracts the rope 93 of the stabilizer 9 according to the turning, while the worker on the deck 10 gradually extends the rope 23 on the bow side. At 2, the mounted boat 2 is rotated clockwise to prevent contact with the hull 1 of the mother ship and to guide the mounted boat 2 onto the pedestals 12,12.

When the onboard boat 2 approaches the pedestals 12, 12, the fourth to second hydraulic units 104 to 102 are sequentially stopped to decelerate. 101 is also stopped and the turn is terminated.

Next, the accommodation work is completed by driving the winch 8 to lower the mounted boat 2 and placing it on the pedestals 12, 12 smoothly.

In this manner, the rotatable post 5 is disposed on the outer periphery of the mast 4 erected on the deck 10, and the boom 6 is fixed to the post 5, and both sides of the boom 6 are By arranging hydraulic cylinders 71 and 73 for alternately pulling a wire rope 43 fixed in the middle to a swiveling sheave 41 provided at the upper part of the mast 4, the boom 6 is swung within a range required for the lifting work of the mounted boat 2. The deck crane 3 can be made smaller and lighter than when the boom is turned by the gear mechanism as in the above-described conventional example, and the available area on the deck 10 is increased. At the same time, the weight of the deck crane 3 can be reduced, and the sailing speed of the ship can be improved.

In addition, the turning hydraulic device 13 for driving the hydraulic cylinders 71 and 73 includes a plurality of hydraulic units 101 to
A desired turning speed can be obtained by adjusting the number of hydraulic units that are configured and operated, and positioning during turning can be performed quickly and smoothly.

The hydraulic motor 85 of the winch 8 is directly connected to the drum 80 without using a speed reduction mechanism.
While promoting the miniaturization and weight reduction of the device, this hydraulic motor 8
The lifting hydraulic device 14 for driving the boat 5 controls the flow rate supplied to the hydraulic motor 85 by the plurality of electromagnetic directional switching valves 134 and 135, thereby making the lifting speed variable, and the lifting and lowering of the boat 2. The work can be facilitated and the impact at the time of draining can be suppressed.

Further, in addition to the wire rope 81 and the top sheave 60 for suspending the mounted boat 2, the boom 6 is provided with a stabilizer 9 for suppressing the swing or rotation of the mounted boat 2 suspended at one point by the wire rope 81. Because it is provided, it is a single point hanging that can be raised and lowered quickly,
The onboard boat 2 can be prevented from contacting the hull 1 of the mother ship.

In the above embodiment, the wire rope 43 wound around the revolving sheave 41 is alternately pulled by the hydraulic cylinders 71 and 73 of the boom 6.
A similar effect can be obtained even if the wire rope 43 is replaced with a chain.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of the present invention and showing a part of a hull provided with a deck crane device for loading a boat.

FIG. 2 is a plan view showing a part of the hull.

FIG. 3 is a perspective view of the case where the boom is swung to the surface of the sea and a mounted boat is landed.

FIG. 4 is a half sectional view of a mast and a post.

FIG. 5 is a plan view of a mast.

FIG. 6 is a perspective view showing a stabilizer.

FIG. 7 is a sectional view of a top sheave.

FIG. 8 is a circuit diagram of a turning hydraulic device.

FIG. 9 is a circuit diagram of a lifting hydraulic device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hull 2 Boat 3 Deck crane 4 Mast 5 Post 6 Boom 7 Swing device 8 Winch 9 Stabilizer 10 Deck 13 Turning hydraulic device 14 Lifting hydraulic device 30 Hydraulic unit 41 Turning sheave 42 Notch 43 Wire rope 45 Holder 50 Bracket 51 Reamer bolt 52 Bearing 61 Top sheave 62 Case 71, 73 Hydraulic cylinder 72, 74 Piston rod 71A, 73A Oil chamber 75 Spring 80 Drum 81 Wire rope 82 Hook 83 Stopper 85 Hydraulic motor 91, 92 Double pulley 93 Rope 101-104 Hydraulic unit 110 Motor pump 111 Electromagnetic directional switching valve 131 Motor 132, 133 Pump 134, 135 Electromagnetic directional switching valve

Claims (6)

[Claims] 1. A deck crane having a boom installed on a deck of a ship and capable of turning and a winch and a wire rope for suspending a mounted boat on the sea surface or on the deck, and having a columnar shape erected on the deck. A rotatable cylindrical member is disposed on the outer periphery of the member, and a boom provided with a winch is fixed to the cylindrical member. Providing an actuator that alternately pulls the second wire rope to be hung,
A deck crane device, wherein the guide member is provided with a means for fixing the middle of the second wire rope. 2. The guide member locks the middle of a second wire rope, and the actuator comprises a pair of hydraulic cylinders, and both ends of the second wire rope are respectively connected to piston rods of the hydraulic cylinder. The deck crane device according to claim 1, wherein: 3. The deck crane device according to claim 1, further comprising a stabilizer that is extendable and removable from the boat suspended from the winch in the middle of the boom. 4. The deck crane apparatus according to claim 1, wherein the top sheave is supported so as to be rotatable around a boom axis. 5. The winch includes a hydraulic motor directly connected to a drum on which a wire rope is wound, and a lifting / lowering speed adjusting means for increasing / decreasing a flow rate of hydraulic oil supplied to the hydraulic motor in a stepwise manner. The deck crane device according to claim 1. 6. The hydraulic cylinder according to claim 2, wherein the hydraulic cylinder is provided with a plurality of hydraulic supply sources, and changes the expansion and contraction speed of the piston rod stepwise according to the number of hydraulic supply sources to be operated. Deck crane equipment.