JPH11292454A - Container crane spreader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container crane spreader light in weight and without occurring bend or twist in a flexible frame. SOLUTION: In a container crane spreader equipped with a fixed frame: hung on a trolley, and a flexible frame flexibly provided in right and left directions in accordance with the length of an antenna to a fixed frame, the fixed frame is made a boxlike box main body 28, and also right and left flexible frames are made a telescopic type with each other fo form inner and outer side box frames 29 and 30 slidably supported on the box main body 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a spreader for a container crane.

[0002]

2. Description of the Related Art FIG. 5 is an overall schematic view showing an example of a general container crane. In the figure, reference numeral 1 denotes a container ship moored on a quay 2 and the container ship 1 The container 4 is to be unloaded.

The container crane 3 is provided with a leg 6 on a traveling rail 5 laid along the quay 2 so as to be able to travel,
A girder 7 extending in a substantially horizontal direction is disposed above the leg 6 so as to project toward the sea, and a trolley 9 is provided on a traversing rail 8 laid so as to extend along the girder 7 so as to be able to traverse. Has the following configuration.

As shown in FIGS. 6 and 7, the trolley 9 has a trolley body 11 and traversing wheels 12 which roll on the traversing rails 8, and is mounted in a machine room 10 (see FIG. 5). Both ends of a traversing rope 13 wound around a traversing drum (not shown) provided and stretched along the longitudinal direction of the girder 7 are connected to the trolley body 11 to rotate the traversing drum forward or The trolley 9 is traversed by being rotationally driven in the direction of inversion.

[0005] The trolley 9 is provided with the machine room 10.
A head block 15 is hung by a hoisting rope 14 wound around a hoisting drum (not shown) provided in the inside and extending along the longitudinal direction of the girder 7. The hoisting drum is rotatably driven in the direction of normal rotation or reversal so as to be wound up or down.

The head block 15 includes a container 4
The spreader 16 for gripping the twist lock 17
It is attached detachably.

The twist lock 17 is connected to the spreader 1
The head block 15 and the spreader 16 can be integrated with each other by inserting a lock pin 19 into a long hole formed on the upper surface of the hanging portion 18 and twisting the lock pin 19 with a hydraulic cylinder or the like. It has become.

As shown in FIGS. 5, 7 and 8, the spreader 16 is provided with an endless frame 21 and 22 extending from the fixed frame 20 along the longitudinal direction of the fixed frame 20. The right and left telescopic frames 21 and 22 are fixed to separate sides of the parallel portion of the chain 26 via fixing portions 21 ′ and 22 ′ and driven by the driving device 27. In the left-right direction perpendicular to the traversing direction, it slides together to extend or slides together to reduce the size. It can be hung.

At the distal ends of the telescopic frames 21 and 22, a twist lock 23 for holding the container 4, configured similarly to the twist lock 17 of the head block 15, and the twist lock 23 is fitted to the container 4. A guide arm 24 for positioning at the time of joining is mounted. The guide arm 24 can rotate from an open position, which is flipped upward, to a position that engages with a corner of the container 4 by the operation of the hydraulic motor 25, whereby the container 4 is moved. Spreader 1 integrated with head block 15 from trolley 9 for suspension
When the container 6 is lowered directly above the container 4, the spreader 16 is moved to the container 4 even if a slight displacement occurs.
Is correctly positioned and the twist lock 23 is
To be surely fitted.

The telescopic frame 2 of the normal spreader 16
As shown in FIGS. 8 and 9, each of the frames 1 and 22 has a configuration in which two frames having a rectangular shape whose cross section is long in the vertical direction are connected and arranged at intervals in the width direction of the fixed frame 20. The telescopic frames 21 and 22 are supported by slide portions 21a, 21b, 22a and 22b (FIG. 9) so that they can pass each other with respect to the fixed frame 20. Also, the telescopic frame 2
In addition to the rectangular shapes long in the up-down direction as shown in FIG. 9, some of them have an I-shaped frame.

Generally, in order to load the container 4 on the container ship 1 using the container crane 3, first, a spreader 16 integrated with a head block 15 suspended on a trolley 9 is suspended and placed on the container 4. Then, the spreader 16 and the container 4 are integrated by inserting the lock pin 19 of the twist lock 23 into a long hole formed on the upper surface of the container 4 and twisting the lock pin 19 with a hydraulic cylinder or the like. Head block 15 in the state
Then, a series of operations is performed in which the spreader 16 is hoisted, the trolley 9 is traversed to a target position on the container ship 1, and then the head block 15 and the spreader 16 are unwound, and the container 4 is landed on the container ship 1. .

In such a container crane 3, since the destination of the container 4 is often known in advance, the trolley 9 is automatically traversed after setting the destination address of the container 4 and integrated with the head block 15. Spreader 1
6 can be manually operated only by the operator in the cab 36.

[0013]

However, as described above, when the operator suspends the spreader 16 integrated with the head block 15 on the container 4 and connects the spreader 16 to the container 4, the spreader 16 is generally connected to the container 4. There is a problem that the spreader 16 is damaged because it is placed so as to collide with the container 4.

That is, when the spreader 16 is suspended,
Only the front ends of the telescopic frames 21 and 22 are in contact with the upper surface of the container 4. Since the telescopic frames 21 and 22 have a cantilever structure with respect to the fixed frame 20, the head block 15 and the spreader 16 When a large weight (for example, more than 10 tons) acts on the telescopic frames 21 and 22 at the time of the collision, the telescopic frames 21 and 22
Receives a very large bending load, for example, about 3 to 4 times the bending load received when the container 4 is hung. For this reason, the conventional spreader 16 has a problem that the telescopic frames 21 and 22 are bent. When the telescopic frames 21 and 22 are bent, the telescopic frames 21 and 22 cannot be expanded or contracted by sliding. Therefore, repair is required, and the life of the spreader 16 is shortened. .

The conventional spreader 16 is shown in FIGS.
As shown in the above, since the center lines in the width direction of the left and right telescopic frames 21 and 22 are not aligned, that is, they pass each other, when the container 4 is hung by the spreader 16, the telescopic frames 21 and 22 are eccentric. There has been a case where the device is twisted under a load (torsional load).

Also, as described above, the telescopic frames 21 and
In order not to cause bending or twisting of 2,
It is necessary to take measures such as increasing the size of the spreader 16 or increasing the thickness of the fixed frame 20 and the expansion and contraction frames 21 and 22. However, in this case, the weight of the spreader 16 increases, and thus the container crane increases. However, there is a problem in that the hoisting power increases and the operating cost increases.

Conventionally, it has been considered to increase the cross-sectional strength of the fixed frame 20 and the telescopic frames 21 and 22 so that the cross-sectional shape becomes a box shape.

However, when the fixed frame and the telescopic frame are box-shaped as described above, the telescopic frames 21 and 22 cannot pass each other as shown in FIGS. It is difficult to expand and contract the telescopic frame with a large stroke in response to a change in the length of the container. For this reason, it has been considered that the left and right telescopic frames have a two-stage telescopic structure (telescopic).

However, when each of the left and right telescopic frames has a two-stage telescopic structure as described above, it is possible to maintain sufficient strength because the telescopic frame is greatly bent and bent when the container is suspended. No, it was not an effective method.

The present invention has been made in view of the above circumstances, and has as its object to provide a spreader for a container crane which is lightweight and does not cause bending or twisting of the telescopic frame.

[0021]

According to the first aspect of the present invention,
In a container crane spreader including a fixed frame suspended from a trolley and a telescopic frame provided to be able to expand and contract in the left-right direction in accordance with the length of the container with respect to the fixed frame, the fixed frame has a box shape. A spreader for a container crane, characterized in that the box body is an inner and outer box frame slidably supported by the box body as the telescopic frames on the left and right are nested with each other,
It is related to.

According to a second aspect of the present invention, the nested inner box frame is supported inside one end of the box body by inner support portions provided at positions above and below the center line in the width direction, and the nested outer frame is provided. The box frame is supported inside the other end of the box body by side support portions provided above and below a position symmetrical in the width direction with respect to the center line in the width direction, and is supported by the box body in the outer box frame. 2. The spreader for a container crane according to claim 1, wherein cutouts are formed at upper and lower portions on a base end side to avoid interference with an inner support portion when sliding.

According to the above means, the following effects can be obtained.

Since a box body having a box-shaped cross section is provided with a nested inner box frame and an outer box frame which can be expanded and contracted to the left and right, the inner and outer box frames are provided as compared with the conventional spreader. The bending rigidity of the box frame can be greatly increased, and because of the nesting type, the center axes in the width direction of the inner box frame and the outer box frame coincide with each other. The application of a torsional load can be prevented, so that the strength of the spreader is improved, the problem of damage is reduced, and the life can be extended.

Further, the inner box frame is slidably supported inside one end of the box body by inner support portions provided above and below the center line in the width direction.
The outer box frame is supported inside the other end of the box body by side support portions provided on the upper and lower surfaces at positions symmetrical in the width direction with respect to the center line in the width direction. The upper and lower portions of the base end of the frame that are supported by the box body are formed with cutouts that prevent the outer box frame from interfering with the inner support when the inner and outer box frames expand and contract. The box frame and the outer box frame can freely expand and contract with a large stroke without interfering with each other.

[0026]

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

FIGS. 1 to 4 show an embodiment of the present invention. As shown in FIGS. 6 and 7, the trolley 9 is connected to the lower part of the head block 15 to move up and down. The spreader 16 is configured as follows.

Instead of the fixed frame 20 connected to the head block 15 shown in FIGS.
As shown in FIG. 4, a box body 28 having a box-shaped cross section is provided.

Further, the box body 28 is provided with a nested inner box frame 29 and an outer box frame 30 which can be extended and contracted right and left.

The nested inner box frame 29 is slidably supported inside one end 28a of the box main body 28 by an inner support 31 provided at a position above and below the center line in the width direction as shown in FIG. Have been.

The inner support portion 31 is fixed to the inner surface of the box body 28 so as to face the inner support rail 31a and the inner support rail 31a provided at the upper and lower positions of the center line in the width direction of the inner box frame 29. It is constituted by a guide member 31b fixed by a bracket 32, and a sliding surface between the inner support rail 31a and the guide member 31b is subjected to molybdenum sintering or the like to form an oilless bearing structure. The inner support rail 31a is provided over substantially the entire length of the inner box frame 29, and the guide member 31b is connected to one end 28a of the box main body 28 and from the one end 28a to the other end 28b. It is provided at two positions, that is, at a position separated by a required distance. Reference numeral 33 in FIGS. 3 and 4 denotes a buffer member such as rubber provided between the inner surface of the box main body 28 and the guide member 31b.

As shown in FIG. 4, the nested outer box frame 30 has side support portions 34 provided on upper and lower surfaces at positions symmetrical in the width direction with respect to the center line in the width direction.
Thus, it is supported inside the other end 28b of the box main body 28.

The side support portion 34 includes a side support rail 34a provided on the upper and lower surfaces of a width direction end portion with respect to a width center line of the outer box frame 30, and the side support rail 3
4a, a guide member 34b fixed to the inner surface of the box body 28 by a fixing bracket 32 so as to face the box body 4a. The sliding surface between the side support rail 34a and the guide member 34b has a molybdenum sintered body. The structure of the oil-less bearing is achieved. The side support rails 34a are connected to the outer box frame 30.
Are provided over substantially the entire length of the guide member 3.
4b are provided at two positions, that is, the other end 28b of the box body 28 and a position at a required distance from the other end 28b to the one end 28a. Also in this case, a cushioning member such as rubber is provided between the inner surface of the box main body 28 and the guide member 34b.

Further, at the upper and lower ends of the outer box frame 30 on the base end side supported by the box body 28,
As shown in FIGS. 2 and 3, the box frames 29, 3
The outer box frame 3 when sliding 0
A notch 35 is formed to prevent 0 from interfering with the guide member 31b of the inner support portion 31.

Next, the operation of the illustrated example will be described.

According to the spreader 16 shown in FIGS. 1 to 4, a box body 28 having a box-shaped cross section is provided with a
And the outer box frame 30 are provided, so that the box frame 2 is smaller than the conventional spreader.
The bending rigidity of the inner box frame 29 and the inner box frame 29 can be greatly increased because of the nesting.
Since the center axes in the width direction of the box frame 30 and the outer box frame 30 coincide with each other, it is possible to prevent a torsional load from acting on the box frames 29 and 30, thereby improving the strength of the spreader 16 and damaging it. Can be reduced, and the life can be extended.

Further, the nested inner box frame 29 is slidably supported inside one end 28a of the box body 28 by an inner supporting portion 31 provided at a position above and below the center line in the width direction. The box frame 30 is supported inside the other end portion 28b of the box body 28 by side support portions 34 provided on the upper and lower surfaces at positions symmetrical in the width direction with respect to the center line in the width direction. In order to prevent the outer box frame 30 from interfering with the guide member 31b of the inner support portion 31 when the box frames 29, 30 extend and contract, at the upper and lower ends of the outer box frame 30 supported by the box main body 28. Is formed so that the inner box frame 29 and the outer box frame 30 are mutually It is possible to freely expand and contract in a large stroke without negotiations.

The spreader of the container crane according to the present invention is not limited to the above-described example, and the cross-sectional shapes of the box body 28 and the box frames 29 and 30 can be variously selected. Needless to say, the configuration of the side support portion 34 can be variously changed, and other various changes can be made without departing from the gist of the present invention.

[0039]

As described above, according to the first aspect of the present invention, a nested inner box frame and an outer box frame are provided on a box body having a box-shaped cross section. , The bending rigidity of the inner and outer box frames can be greatly increased compared to the conventional spreader, and since it is a nested type, the inner box frame and the outer box frame Since the center axes in the width direction of the box frames coincide with each other, it is possible to prevent the torsional load from acting on the inner and outer box frames, thereby improving the strength of the spreader, reducing the problem of damage, and improving the service life. Can be extended.

Further, according to the second aspect of the present invention, the inner box frame is slidably supported inside one end of the box main body by the inner supporting portions provided above and below the center line in the width direction. The outer box frame is supported inside the other end of the box body by side support portions provided on the upper and lower surfaces at positions symmetrical in the width direction with respect to the center line in the width direction. The upper and lower base sides of the box frame that are supported by the box body form cutouts that prevent the outer box frame from interfering with the inner support when the inner and outer box frames expand and contract. The box frame and the outer box frame can be freely expanded and contracted with a large stroke without interfering with each other. That.

[Brief description of the drawings]

FIG. 1 is a front view of an example of an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 1;

FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 1;

FIG. 5 is an overall schematic diagram illustrating an example of a general container crane.

FIG. 6 is a side view showing an example of a conventional spreader for a container crane.

FIG. 7 is a front view showing an example of a conventional spreader for a container crane.

FIG. 8 is a view taken in the direction of arrows VIII-VIII in FIG. 7;

FIG. 9 is a view taken in the direction of arrows IX-IX in FIG. 7;

[Explanation of symbols]

 Reference Signs List 9 trolley 20 fixed frame 21 telescopic frame 22 telescopic frame 28 box body 28a one end 28b other end 29 inner box frame 30 outer box frame 31 inner support part 34 side support part 35 cutout

Claims (2)

[Claims] 1. A spreader for a container crane, comprising: a fixed frame suspended from a trolley; and a telescopic frame provided to be able to expand and contract in the left-right direction according to the length of the container with respect to the fixed frame. While making the frame a box-shaped box body,
A spreader for a container crane, characterized in that the left and right telescopic frames are nested with each other, and the inner and outer box frames are slidably supported by the box body. 2. The nested inner box frame is supported inside one end of the box body by inner support portions provided above and below the center line in the width direction. Upper and lower bases supported on the inside of the other end of the box body by the side support portions provided at the upper and lower positions symmetrical in the width direction with respect to the direction center line, and supported by the box body in the outer box frame 2. A spreader for a container crane according to claim 1, wherein a notch portion is formed to avoid interference with the inner support portion when sliding.