JP3039445B2 - Container crane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane for handling containers.

[0002]

2. Description of the Related Art There is a demand for more efficient handling of containers. For this reason, as shown in Japanese Patent Publication No. 7-68036, one container crane includes a crane in which two trolleys for lifting containers and a trolley for placing containers between the two trolleys are provided. The three trolleys are adapted to run on the crane girder (including the boom). The center trolley relays the container,
The container cradle is suspended from the trolley.

[0003] When a trolley on the sea side lifts a container from a ship, one or both of the trolley and the relay trolley travel, and a cradle for the relay trolley is placed below the container on which the trolley is suspended. Position and place container on cradle. Next, one or both of the relay trolley and the land-side trolley are driven to position the relay trolley container below the land-side trolley, and the container is transferred to the land-side trolley. The trolley on the land side unloads the container on land.

In Japanese Utility Model Laid-Open No. 59-149889, a cradle for a relay trolley is provided so as to be movable up and down.
However, the space between the cradle and the trolley is steel. Also, the trolley on the land side does not run.

[0005] Japanese Unexamined Patent Publication No. Hei 5-97251 discloses a structure in which a second girder of the same length as the boom and on which a bogie carrying a container runs is provided below the boom on which the trolley runs. is there. The container is lifted by a trolley, placed on a trolley, and the trolley travels to the crane's leg side, and is transported to the ground side by a lifting platform. The second girder on which the truck travels goes up and down.

[0006] Japanese Utility Model Publication No. 61-39749 discloses a method in which a second girder provided with a conveyor is provided below a traveling range of two trolleys, and the second girder is moved in the traveling direction of the trolley. It is to move up and down. Second
The girder tip is located above the ship's container.

[0007]

The object of the invention is to be Solved Tokuoyake flat 7-68036
In the relay trolley disclosed in Japanese Unexamined Patent Application Publication No. 59-149889, a cradle on which containers are placed and a trolley running on a girder are connected by a steel frame. There is a considerable height distance between the cradle and the trolley. The cradle holds a container with a mass of several tens of tons. In particular, since the relay trolley travels with a container mounted thereon, the steel frame is large and heavy.
For this reason, the supporting trolley, girder, boom, and its legs also become heavy.

Further, the height of the cradle of the relay trolley disclosed in Japanese Patent Publication No. 7-68036 is higher than the uppermost part of the containers stacked on the deck of the ship. For this reason, the relay trolley can be located above the ship. However, the height of the cradle cannot be changed because the cradle is suspended by a steel frame. 59-149
Although the receiving tray of the relay trolley disclosed in Japanese Patent No. 889 can be raised and lowered,
You cannot descend close to the ship's deck. For this reason, even if the unloading progresses, the trolley on the sea side and the trolley on the land side need to raise the lifting device to a high position, and it takes time to unload. The same applies when loading containers on ships.

Japanese Patent Application Laid-Open No. 5-97251, Japanese Utility Model Publication No. 61
Since the second girder of JP-A-39749 is long,
Large and heavy.

The lifting device of the sea-side trolley disclosed in Japanese Patent Application Laid-Open No. 5-97251 goes up and down through the second girder, so that it is necessary to prevent collision with a traveling bogie, and sufficient control is required to improve cargo handling efficiency. Is required.

[0011] Japanese Utility Model Publication No. 61-39747 discloses
Since the second girder moves horizontally, the land-side cargo handling position is limited.

A first object of the present invention is to reduce the weight of a container crane having a relay trolley.

[0013]

[0014]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
The first means, girder and boom, the first digit on both sides of two trolley travels, the second digit central trolley runs made, the second digit, the first 1 digit
At a more horizontal position than the side of the first girder
And fixed, the position of the tip of the second digit of the sea side the
Characterized by being on the land side of the first digit on the sea side.
I do.

A second means for achieving the above object is as follows:
A first tensioner connecting the upper end of the mast and the end of the boom
Tension bar, the first tension boom and the boom
Connect the land side and the upper end of the mast from the connection point with
The second tension bar, the girder and the boom,
The first rail on which the two trolleys on both sides run,
A second rail on which a trolley travels ;
Rails are installed more horizontally than the first rail
And the position of the sea-side end of the second rail is
The connection point between the second tension bar and the boom is used as a reference.
And the position of the sea-side end of the second rail.
The rail shall be on the land side of the first rail on the sea side.
And, characterized by.

[0016]

1 to 8 show an embodiment of the present invention.
This will be described below. In FIG. 1, the container crane 20
Is for cargo handling between the ship S and a vehicle (not shown) on the land side. The crane 20 has a girder 31 provided horizontally above the four legs 21 and 22. On the sea side of girder 31,
A boom 32 that rotates upward from a horizontal state is provided. The upper end of the mast 24 provided above the leg 22 and the girder 31 on the leg 21 side are connected by a tension bar 27.
The upper end of the mast 24 and the boom 32 are connected at 28 and 29 from the tension bar. Tension bars 28, 29
Consists of links or ropes. There are ropes to rotate the boom, but they are not shown.

There are three trolleys 41, 45, 60 that run on the girder 31 and the boom 32. The boom 32 is one of the girders. It may also be called a digit. Trolley 41
Is on the land side, and the receiving side 61 of the trolley 60 for the land side and the relay
It is to handle the container between and. Trolley 45
Is for loading and unloading containers between the ship S and the cradle 61 of the trolley 60 for relay. The trolley 45 travels from the sea-side end of the boom 32 to near the land-side end of the girder 31.

The trolley 41 is moved from the land-side loading position to the trolley 6.
The vehicle travels in a range up to the relay position with 0. The land-side cargo handling position is a position between the land-side leg 21 and the sea-side leg 22, or a position on the land side of the land-side leg 21. Here, the space between the leg 21 and the leg 22 is the cargo handling position, and the hanging member 42, the container C
A guide 35G for guiding the ascending / descending movement is provided. The relay position is in a range from between the leg 21 and the leg 22 to above the ship S (the position of the boom 32).

The trolley 45 travels mainly between the upper part of the ship S (the position of the boom 32) and the trolley 60. Trolley 4
The range of the relay position between the trolley 60 and the trolley 60 is a range between a position near the leg 22 between the legs 21 and 22 and above the ship S.

The trolleys 41 and 45 hang suspenders 42 and 46 for detaching the container from above through ropes. The hoists 42, 46 are raised and lowered by a hoisting device (not shown).

In the relay trolley 60, a receiving table 61 on which a container is placed is suspended via a rope 62. The cradle 61 can be placed even when the container has a stacking cone on its lower surface.
The receiving table 61 can be moved up and down. The cradle 61 can be lowered onto the ground in consideration of replacement of the rope.

4 and 5, trolleys 41 and 45 are used.
Travels on rails 47, 47 installed on the inner side surfaces of the boom 32 and the girder 31.

The girder 31 and the boom 32 are each composed of two parallel members. The two members are a plurality of cross beams 33
Are connected by A rail 35 on which the trolleys 41 and 45 run is provided at a lower portion of the inner side surface of each of the members of the girder 31 and the boom 32. Girder 31 and boom 3
An auxiliary girder 37 for the trolley 60 is fixed to an outer side surface of each of the members 2. Rails 38 and 39 are provided at the lower part of the upper surface and the outer side surface of each member of the auxiliary girder 37. Since the auxiliary girder 37 is integral with the girder 31 and the boom 32, it is a girder and a boom, but they are separately referred to here for convenience. Further, the auxiliary girder 37 may be included in the girder 31 or the boom 32 in some cases. The auxiliary digit may be simply referred to as a digit.

The trolley 60 is installed outside the auxiliary girder 37 and is divided into right and left. Each trolley 60 runs on rails 38,39. The trolley 60 is the rail 38
, A wheel in contact with the inner side surface of the rail 38 (the surface on the other trolley 60 side), and a wheel in contact with the side surface of the rail 39 (both not shown). Thus, traveling can be performed while preventing the trolley 60 from tipping over. The frame of the trolley 60 has a vertical section
L-shaped. The frame is a vertical piece 81 having wheels and the like.
And a horizontal piece 82 on which a traveling device or a hoisting device 70 described below is mounted, and an inclined member 83 connecting the both. That is, it is a cantilever type. Therefore, a large space can be obtained above the horizontal piece 82. Therefore, devices such as the hoisting device 70 can be easily installed. Also, in a system in which devices such as the hoisting device 70 are installed in the machine room 50 (rope trolley type or semi-rope trolley type), the rope can be easily arranged by utilizing a large space above.

Each of the trolleys 60 includes a traveling device (including an electric motor and the like) for traveling the trolley 60, and a hanger 6
1 has a hoisting device (including an electric motor or the like) 70 for raising and lowering 1. The control devices of the trolleys 60 are located in the machine room 50 installed in the girder 31 so that the traveling (including stop) of the two trolleys 60 is synchronized and the lifting and lowering of the hanging members 61 are synchronized. For this purpose, the trolleys 60, 60
Is equipped with various detectors. For example, a rotation amount detector for a wheel, a traveling position detector, a rotation amount detector for a hoisting device, and the like. The trolleys 60 and 60 and the machine room 50 are connected with curtain cables (not shown) like the other trolleys 41 and 45.
Connected with.

When viewed from the traveling direction of the trolleys 60, 60, the distance between the ropes 62a, 62b of one trolley 60 and the ropes 62a, 62b of the other trolley 60 is larger than the length of the hanging members 42, 46 and the container. large. The legs 22, 22 are outside the ropes 62a, 62b. The ropes 62a, 62b drawn out from the hoisting device 70 of each trolley 60 are fixed to one point of each end of the cradle 61 via sheaves 63a, 63b. As is apparent from FIG. 6, one trolley 60 has four ropes and four sheaves. In addition, "fixed to one point" is when viewed from the traveling direction of the trolley 60, and the actual fixed points are four points. In FIG. 6, if the positions of the sheaves 63a and 63b are the same, the fixing points of the ropes 62a and 62b to the cradle 61 can be the same.

When viewed from the traveling direction of the trolleys 60, the ropes 62a, 62b are inclined symmetrically to the left and right with respect to a vertical line centered on the respective fixed points. The angles θ2 and θ2 formed by the ropes 62a and 62b with respect to the vertical line are the same. For this reason, it is possible to suppress the swing of the receiving table 61 due to the wind from the longitudinal direction of the container.

The traveling of the trolley 60 and the pedestal 61
The device for moving up and down can be installed in the machine room 50 without being provided in the trolley 60. In this case, there is no fixed point of the ropes 62a, 62b on the cradle 61.

Traveling of the trolleys 41 and 45 and the hanging tool 6
The device for performing the lifting and lowering steps 2 and 66 may be installed in the trolleys 41 and 45 or in the machine room 50 of the girder 32.

FIG. 6 is a view seen from a horizontal direction perpendicular to the traveling direction of the trolley. Four ropes 62a, 62b, 6 drawn out from the drum 71 of the hoisting device 70
2a, 62b are sheaves 63a, 63b, 63a, 63
It is fixed to the cradle 61 via b. In the traveling direction of the trolley 60, the interval at which the rope is hung from the trolley 60 is sufficiently larger than the interval between fixed points to the cradle 61 (the interval at which the cradle 61 is lifted). The inclination angle θ1 of each rope with respect to the vertical line at each fixed point is the same. "62a, 62b" is described as "62", and "6
3a, 63b "may be described as" 63 ". The rope 62 may be a chain.

According to this, since the ropes 62a and 62b between the trolley 60 and the cradle 61 are inclined, the sway of the cradle 61 due to the traveling of the trolley 60 can be suppressed. Further, since the ropes 62a and 62b are fixed to the receiving table 61, the swing of the receiving table 61 can be easily suppressed.
Moreover, since two systems are provided, it is easy to suppress the swing of the cradle 61. Further, since the inclination angles θ1 of the ropes 62a and 62b are the same, it is possible to make the winding amount of the rope of the drum 71 the same.

7 and 8, the girders 31, 37 and the booms 32, 37 are connected by pins 30. Brackets projecting upward from the girders 31 and 37 and the booms 32 and 37 are connected by pins 30. All the rails 35, 38, 39 are provided below the pins 30. Since the pins 30 are above the rails 35, 38, 39, the construction of the bracket is simplified. Also, the connecting portions between the rails can be made vertical. The wheels of the trolley 60 are mounted on the horizontal surface on the upper surface of the rail 38, but the rail 38 may be inclined inward.

The pin 30 can be provided below the rail 38. In this case, the connection between the rail 38 of the girder 31 and the rail 38 of the boom 32 is provided on the girder 31 side with respect to the pin 30 or on the boom 32 side with respect to the pin 30. This connection is inclined with respect to the lead wire. When the connecting portion is provided on the girder 31 side, the inclined surface of the end of the rail on the girder 31 side is located above the inclined surface of the end of the rail on the boom 32 side. When the connecting portion is provided on the boom 32 side, the relationship between the inclined surfaces is reversed.

A case where the container C of the ship S is loaded on the land side in such a configuration will be described. The relay trolley 60 stops between the position of the container C to be unloaded and the unloading position on the land side. The trolley 45 raises the hanging tool 46 holding the container C. When the lower surface of the container has risen to a height at which it can travel toward the trolley 60, the rising is stopped. In this state, the trolley 60 is a relay trolley 60.
Start running toward. If the trolley 45 stops at the position of the stopped trolley 60, the hanging tool 46
And lower the container C. Thus the ship S
Is carried out. Next, the hanging tool 46 is slightly raised, and the trolley 45 moves to the sea side toward the position of the next container C. The trolley 45 does so when the lifting and lowering and running of the hanging tool 46 can be performed simultaneously.

When the trolley 45 starts moving toward the ship S,
The trolley 41 moves and stops at the position of the trolley 60. The trolley 41 travels while maintaining the height of the hanging member 42 at a height based on the height of the upper surface of the container on the receiving table 61, and reaches above the receiving table 61. Then, the trolley 41 lowers the hanging tool 42, grasps the container C of the cradle 61,
Raise and lift, travel toward the land side, and guide 35
At the position of G , lower the container C
Take down. If the trolley 41 can perform the traveling and the lowering of the suspending device 42 at the same time, this is done. Thus, the transportation to the land side is performed.

The stop position of the relay trolley 60 and the height position of the cradle 61 are determined by the loading time of the trolley 45 from the ship S to the cradle 61 and the trolley 41 from the cradle 61 to the unloading position on the land side. Is determined at a position where the cargo handling time is almost the same. The waiting time of one of the trolleys 41 and 45 is prevented from increasing. Therefore, the relay position between the trolley 45 and the trolley 60 may be above the ship S. Generally, when handling containers on the deck of the ship S, the trolley 60 is located on the sea side near the legs 22. The trolley 60 is located above the ship S when loading and unloading a container in the hold. The stop position of the trolley 60 is
Is near the position where the robot goes up and down.

The stop position of the relay trolley 60 and the height position of the receiving stand 61 are calculated and determined by the operator of the trolley 60 designating the cargo handling position of the next container. Alternatively, it is sequentially determined according to the cargo handling plan of the first container. The trolley 60 operates automatically.

The height position of the cradle 61 of the relay trolley 60 will be described. The trolley 45 lifts the container C, and moves the container C to a height at which the container C can travel toward the cradle 61.
To rise. The height at which the vehicle can travel is considered based on the minimum height. Next, the hanger 46 is run toward the cradle 61 while maintaining the height of the hanger 46. Cradle 6
The trolley 45 is stopped above 1 and the hanging tool 46 is lowered. The height position of the receiving table 61 is a height at which the trolley 45 can travel without changing the height of the container C while the container C is suspended. The height of the cradle 61 is slightly lower than the lower surface of the container C that has been lifted. Therefore, if the cradle 61 is above the container on the deck of the ship S, the lower surface of the container is higher than the height of the cradle 61. Trolley 45
Is stopped above the pedestal 61, the hanging tool is lowered.

The case of unloading the container above the container stacked on the deck of the ship S will be described. FIG. 1 shows a case where the container at the position C1 is unloaded in the initial state of unloading, and the container at the position C1 is lifted. The height position of the cradle 61 is slightly higher than the upper surface of the uppermost container C2 on the cradle 61 side than the position of C1. The lower surface of the container C lifted by the lifting tool 46 is higher than the cradle 61. The height of container C2 is trolley 4.
This is a height that becomes an obstacle in running of No. 5.

In FIG. 1, if there is no container closer to the trolley 60 than the container at the position C2,
The height position of 1 is below the upper surface of the container C2.
In this case, when the trolley 46 passes over the container C2, the traveling and the lowering of the hanging members 46 are simultaneously performed toward the receiving table 61.

As the unloading proceeds, as shown in FIG. 2, when the height of the container is lowered and the container at the position C3 is to be unloaded, the height of the cradle 61 is set at the container C3.
The height is slightly higher than the upper surface of the uppermost container C4 on the cradle 61 side. The height of the container C4 is a height that becomes an obstacle in running the trolley 45. FIG. 2 shows a state where the container C3 is lifted.

As the unloading proceeds further, as shown in FIG. 3, the container on the deck disappears, and the container C5 in the hold is released.
When the container C5 is unloaded, the height at which the suspended container C5 can travel is the height at which it can travel on the deck.

As described above, since the height position of the cradle 61 is lowered in accordance with the progress of unloading of the container, the operation of raising the hanging members 46 of the trolley 45 becomes unnecessary.
The cargo handling time can be reduced. Further, since the height position of the cradle 61 is lowered, the height position of the hanging member 42 of the trolley 41 is also lowered. For this reason, the cargo handling time by the trolley 41 can also be shortened.

The height of the hanging member 42 of the trolley 41 and the trolley 4
The height of the hanger 46 of the fifth embodiment is substantially the same. However, the height of the suspender 42 for grasping the container placed on the receiving table 61 may be lower depending on how to grasp. For example, with the rear flipper protruding downward in the traveling direction of the trolley 41, the trolley 41
, And the flipper hits the container of the cradle 61. In this case, the cradle 61 swings, but is suppressed because the rope 62 is stretched diagonally.

The height position of the cradle 61 may be higher than the lower surface of the container when the trolley 45 travels, but this is not necessary. The height of the cradle 61 of the trolley 60 at the time of unloading is determined by the trolley 4 with the container suspended.
Reference numeral 5 denotes a height based on a height at which the vehicle can travel toward the cradle 61. More specifically, the height is a height based on a height at which the container suspended by the suspending tool 46 can be lowered and placed on the receiving table 61. The height position of the cradle 61 may be sufficiently lower than the lower surface of the container of the hanger 46 when the traveling of the trolley 45 and the lowering of the hanger 46 can be performed simultaneously.

The trolley 41 traveling from the unloading position to the receiving table 61 raises the suspender 42 at the unloading position and stops the lifting slightly above the height of the receiving table 61.
Next, the traveling of the trolley 41 is started, the traveling is stopped above the cradle 61, and the hanging member 42 is lowered. Cradle 61
The trolley 41 grasping the container (1) slightly raises the hanging member 42 and moves the hanging member 42 toward the unloading position. The traveling of the trolley 41 is stopped at the unloading position, and the hanging member 42 is lowered.

The trolleys 41 and 45 are operated manually or automatically. The trolleys 41 and 45 may run and move up and down simultaneously. Unless the traveling and the elevating are performed at the same time, it is possible to easily control the swing of the hanging tool during traveling. In addition, since the height from the container of the ship S to the cradle 61 is low, the effect that the trolley 45 moves and moves up and down simultaneously is small. The trolley 41 has a high possibility of performing traveling and elevating at the same time. The trolley 60 travels and moves up and down automatically.

In the above embodiment, the stop position of the trolley 60 in the traveling direction is changed depending on the position of the next container to be unloaded from the ship. However, one traveling position can be set for a plurality of containers. This is to prevent the cradle 61 from shaking. The stopping position of the lifting and lowering of the receiving table 61 can be similarly set.

Since the cradle 61 is suspended from the trolley 60 with the rope 62, it can be made lighter and smaller than a steel frame.

When the hanging members 42, 46 of the trolleys 41, 45 transfer the container with the receiving table 61, the receiving table 61 may shake due to the swing of the hanging members 42, 46 or the like. In order to prevent this, the tension angle of the rope 62 that suspends the cradle 61 is increased.

As can be understood from the above description, the height position of the cradle 61 of the trolley 60 when the containers on land are loaded on the ship S is lifted from the cradle 61 with reference to the loading position on the ship S side. The height is based on the height at which the trolley 45 can travel toward the ship. The height at which the vehicle can travel is considered based on the minimum height. Cradle 61
Gradually rises.

1 and 5, the auxiliary girder 37 (rails 38, 39) of the boom 32 is located only on the side of the girder 31 from near the connection point 28b between the boom 32 and the tension bar 28. The trolley 60 cannot travel beyond the connection point 28b . Therefore, the load of the auxiliary girder 37 and the trolley 60 is applied to the tension bar 28, but the tension bar 2
I do not participate in 9. Therefore, the tension bar 29 does not need to be large and can be made inexpensive. Further, the boom 32 can be reduced in weight. The auxiliary girder 37 can also be reduced in weight. Trolley 60 is tension bar 2
It is desirable to be able to travel beyond the connection point 28b between 8, but as it can be substantially the same loading and unloading time of the trolley 41, 45 at the location of the connection point 28 b. In a general crane, the connection point 28b is located at a position where the trolleys 41 and 45 can have substantially the same cargo handling time. Conversely, the position of the connection point 28 b is selected in a position that can be substantially the same loading and unloading time of the trolley 41 and 45. The range in which the load is applied only to the tension bar 28 can be said to be the position where the center position in the traveling direction of the trolley 60 intersects the extension line of the tension bar 28 and the rail 38.

The position of the tip of the auxiliary girder 37 (rails 38, 39) on the sea side is such that, when the trolley 60 is located on the tip, the hanging member 46 of the trolley 45 located on the sea side of the trolley 60 can be moved up and down. Position.

The position of the tip of the auxiliary girder 37 (rails 38, 39) on the land side must be such that the trolley 60 can be positioned at least on the land side with respect to the sea-side legs 22. Land leg 21
There is no auxiliary girder 37 on the land side. This is to reduce the possibility of the crane falling.

In the above embodiment, the trolley 60 does not travel when the container is loaded, but the trolley 60 may travel with the container loaded for shortening the time. In this case, the trolley 41 on the land side can be fixed as shown in Japanese Utility Model Laid-Open No. 59-149889.

The case where the trolley 41 and the trolley 60 are installed by extension will be described. The girder 31 and the boom 32 in the range in which the trolleys 41 and 60 run have an auxiliary girder attached to the horizontal outer side surface thereof by welding or bolts.
The rails 38 and 39 are installed on the auxiliary girder. Trolley 41, 6
The machine room for 0 is installed separately on the girder 31. Further, the auxiliary girder is welded to the lower surface of the member which is welded to the upper surfaces of the girder 31 and the boom 32 and protrudes outward. The auxiliary girder is one of girder and boom.

As shown in FIG. 9, the trolley 60 may be of a suspension type. The trolley 60b is suspended from two rails of the auxiliary girder 37b. The lower part of the auxiliary girder 37b is below the lower parts of the girder 31 and the boom 32, and the rail is installed here.

In the above embodiment, the trolley 41 is
It is assumed that cargo handling is carried out between the vehicle and the traveling road surface. However, the same applies to the case where cargo is carried out above the traveling road surface, for example, with equipment having a height of the deck of the ship S.

The technical scope of the present invention is not limited to the language described in the claims or the language described in the section for solving the problem, and is easily replaced by those skilled in the art. It extends to a range.

[0060]

According to the first aspect of the present invention, a relay toro is provided.
The range of travel of the relay is limited, and this relay trolley
To the side of the girder on which the other two trolleys run
Therefore, this girder can be easily installed and can be reduced in weight.

According to the invention of claim 4, the relay trolley is
Set the position of the running rail on the sea side in the middle of the boom and the tension.
Move to the sea side because it is near the connection point with the
Hang the load from the relay trolley with the tension bar
The tension bar and boom on the distal end
It can be a quantity.

[Brief description of the drawings]

FIG. 1 is a side view of a crane according to an embodiment of the present invention.

FIG. 2 is a side view of the crane according to one embodiment of the present invention, illustrating a method of unloading.

FIG. 3 is a side view of a crane according to an embodiment of the present invention, illustrating a method of unloading.

FIG. 4 is a longitudinal sectional view of the boom side as viewed from the position of the girder in FIG. 1;

FIG. 5 is a plan view of the boom of FIG. 1;

FIG. 6 is a side view of the trolley of FIG. 1;

FIG. 7 is a side view of a connecting portion between the girder and the boom in FIG. 1;

FIG. 8 is a plan view of FIG. 7;

FIG. 9 is a longitudinal sectional view of a crane according to another embodiment of the present invention.

[Explanation of symbols]

31: girder, 32: boom, 37, 37b: auxiliary girder,
35, 38, 39: rail, 41, 45: trolley, 4
2, 46: hanging tool, 60, 60b: trolley for relay, 6
1: Cradle .

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshiaki Miyanaga 794, Higashi-Toyoi, Kazamatsu, Kudamatsu City, Yamaguchi Prefecture Inside the Hitachi, Ltd.Kasato Plant (56) References JP-A-8-133664 (JP, A) JP-A-9-58973 (JP, A) JP-A-8-503442 (JP, A) (58) Field (Int. Cl. ⁷ , DB name) B66C 19/00-19/02

Claims (7)

(57) [Claims] 1. A girder supported by four legs, a boom connected to an end of the girder and projecting in a horizontal direction in a use state, and three trolleys running on the girder and the boom. In the traveling direction of the three trolleys, the two trolleys at both ends are provided with hanging members for hanging containers, and in the traveling direction, the central trolley places containers from the respective hanging members of the two trolleys. Wherein the hanger of each of the two trolleys can be located above the cradle; the girder and the boom comprise a first spar on which the two trolleys travel; The second that the central trolley runs
And the second digit is located at a position more horizontal than the first digit.
The first girder is fixed to the side surface of the first girder, and the position of the tip of the second girder on the sea side is located on the sea side of the first girder.
And the position of the tip of the sea side of the first girder is located on the land side of the sea of the second girder.
In the state where the center trolley is located at the tip of the side ,
The hanger is the cradle of the height of the center of the trolley of the Toro <br/> re sea side which is positioned on the sea side from said central trolley
A container crane that can be raised and lowered above and below the position. 2. The land of the second girder according to claim 1, wherein a land-side tip of the second girder is located between the sea-side leg and the land-side leg.
A container crane. 3. The container crane according to claim 1, wherein the second girder is fixed to the first girder at a position outside of the first girder in a horizontal direction. 4. A is supported by four legs girder, is connected to the end of the girder, the boom projecting horizontally in the use state, the upper end and the boom of the mast located above the leg A first tension bar connecting a tip end side, a second tension bar connecting a land side of the connection point between the first tension boom and the boom and an upper end of the mast, the girder and the girder; In the traveling direction of the three trolleys, the two trolleys at both ends are provided with suspenders for suspending the container. A cradle on which containers from each hanger can be placed, wherein the hanger of each of the two trolleys can be located above the cradle; And the boom includes a first rail on which the two trolleys travel, and a second rail on which the central trolley travels, wherein the second rail is more horizontal than the first rail. The position of the tip of the second rail on the sea side is at a position based on a connection point between the second tension bar and the boom, and the position of the second rail is The position of the sea-side tip is on the land side of the sea-side position of the first rail, and the position of the sea-side tip of the first rail is the sea-side tip of the second rail. In a state in which the central trolley is located, the suspenders of the trolley on the sea side located closer to the sea than the central trolley can move up and down above the height position of the cradle of the central trolley. Container clay, characterized in that: . 5. The method of claim 4, wherein the second container crane that is characterized lying between the land side of the distal end of the rail and the leg and land side of the leg of the sea side. 6. The method of claim 4, wherein the girder and the boom and the first digit installed the first rail, a second digit installed the second rail, consists, the second The girder is fixed to the outer side surface of the first girder, and the sea-side tip of the second girder is located at a position based on a connection point between the second tension bar and the boom. The position of the tip of the second girder on the sea side is closer to the land than the position of the first girder on the sea side, The container crane. 7. A land according to claim 4, wherein a land-side tip of the second girder is between the sea-side leg and the land-side leg.
A container crane.