JPH09151076A - Transfer crane and its operation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently perform cargo handling work in a container yard. SOLUTION: A transfer crane 20 to perform cargo handling work in a container yard, has laterally movable lower installed trolley 27 and upper installed trolley 34 by vertically leaving an interval. When containers 29 under stage stacking containers 29 are taken out, the upper installed trolley 34 temporarily raises these just above those. After the containers 29 are taken out by the lower installed trolley 27, the temporarily raised containers 29 are lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer crane for handling containers in a container yard or the like for collecting and delivering containers for transporting cargo, and a method of operating the same.

[0002]

2. Description of the Related Art Conventionally, in a container terminal, a container yard for temporarily storing containers has been employed by using a method as shown in FIG. There are many places. The number of stages is, for example, about 3 to 4 stages. Technical materials related to the automation of container terminals include, for example, the magazine “Port Handling” September 1982 (Vol. 27, No. 5). Japanese Utility Model Application Laid-Open No. 60-57584 discloses a prior art in which small containers are stacked in a large container.

Referring to FIG. 19, a container yard has:
A self-propelled transfer crane for loading and unloading containers is provided, and the main frame 1 has a gate shape in which a main girder 2 is used as a horizontal girder and both ends are supported by legs 3 and 4. Rubber tires 5 and 6 are provided at the bases of the legs 3 and 4. In some cases, the vehicle may have wheels for rail travel. A trolley 7 can reciprocate along the main girder 2. A spreader 8 is suspended from the trolley 7 to load and unload the container 9. A passage through which the trailer 10 can travel is provided between the legs 3 and 4, and the container 9 is transferred between the stacked containers 9 and the trailer 10.

As shown in FIG. 19A, for example, when a container 9 at a lowermost position indicated by a is taken out of a container 9 stacked in three stages and is to be mounted on a trailer 10, b
It is necessary to temporarily remove the container 9 immediately above indicated by c and c. Therefore, as shown in FIGS. 19 (2) and (3), it is necessary to lift the containers 9 indicated by c and b one by one and move them to a nearby empty space. Next, as shown in FIG. 19D, the target container 9 indicated by a
, The trolley 7 moves to a position on the trailer 10 as shown in FIG. 19 (5), and the container 9 is lowered from the spreader 8.

FIG. 20 shows a container 9 by a spreader 8.
The principle of lifting and releasing is shown. The container 9 has a rectangular parallelepiped shape, and an upper corner fitting 11 is attached to an upper corner, and a lower corner fitting 12 is attached to a lower corner. Twist locks 13 are provided at four corners on the lower surface of the spreader 8, and can be engaged with and disengaged from the upper corner fitting 11 of the container 9. An actuator for angularly displacing the twist lock 13 around its axis is built in the spreader 8, and a cable 14 is connected to the power supply. Also spreader 8
Is suspended from the trolley 7 by the wire 15 and the wire 1
Ascending and descending are carried out in accordance with the hoisting and lowering of 5.

FIG. 21 shows a structure related to the engagement between the twist lock 13 and the upper corner fitting 11. As shown in FIG. 21A, a long hole 16 is formed on the upper surface of the upper corner fitting 11, and side holes 17 and 18 are formed on the side surface. As shown in FIG. 21 (2), an elongated lock member 19 is provided at the tip of the twist lock 13. When the twist lock 13 is inserted into the elongated hole 16 and changes its direction, the lock member 19 engages in the upper corner fitting 11. And the container 9 can be lifted. When the locked lock member 19 is again oriented in the direction of the long hole 16, the twist lock 13 is moved to the upper corner fitting 11.
Can be withdrawn.

FIGS. 22 and 23 show JIS Z161.
The shapes of the upper corner fitting 11 and the lower corner fitting 12 defined as 6 are shown. (1) and (3) of each figure show a left side view and a front view, respectively. FIG.
(2) is a plan view, and (4) and (5) of FIG. 22 are shown in FIG.
2 (3) is a sectional view taken along section line IV-IV and V-V, respectively. (4) of FIG. 23 is a bottom view and FIG.
(2) and (5) correspond to the section line II- in FIG.
Sectional views as seen from II and VV respectively. The upper corner fitting 11 and the lower corner fitting 12 each have a long hole 16 formed on the upper surface or the lower surface, and the side hole 1 is formed on the side surface.
7 and 18 are formed together and can be used for cargo handling work.

[0008]

In the conventional transfer crane, when removing the stacked lower and middle containers 9, it is necessary to temporarily remove the upper containers 9 one by one. Such unloading / transferring operations in the container yard are also referred to as shuffling operations, and cause wasteful work requiring time and effort. Further, since the removed containers 9 are dispersedly arranged in the empty space positions, the storage position management of the containers 9 becomes complicated, which is one of the major causes of erroneous management. If there is no empty space in the bay where containers are stacked, the transfer crane must be run to move the removed container 9 into the adjacent bay, which is increasingly time, labor and management problems. Will occur.

Although a three-dimensional automatic warehouse system and a rotating three-dimensional storage system have been proposed as a concept for eliminating or facilitating the shuffle operation, the container 9 is large and heavy, so that the construction It has not been realized yet because of the high cost.

[0010] It is an object of the present invention to provide a transfer crane and a method of operating the transfer crane that can efficiently perform cargo handling work in a container yard.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a transfer crane for loading and unloading containers in a container yard for storing and stacking containers. The main frame is provided with two rails vertically spaced from each other in the direction in which the horizontal girder extends, and the main frame is moved along the lower rails. A possible lower installation trolley, an upper installation trolley capable of moving the main frame along the upper rail, a suspension means mounted on the lower installation trolley, and a hanging means for individually loading and unloading the stacked containers, A container mounted on the upper trolley and directly above the container to be unloaded by the hanging means is suspended to a position higher than the moving position of the lower trolley. A transfer crane which comprises a holding can lifting means raise.
According to the present invention, when another container is stacked immediately above the container to be unloaded, the upper-installed trolley temporarily holds and lifts, and the lower-installed trolley unloads the target container. Do. After the loading / unloading of the target container is completed, the container held by the upper trolley is returned, so that the shuffling operation is simplified, time and labor can be saved, and work efficiency can be improved.

Further, the present invention relates to a transfer crane for loading and unloading containers in a container yard for storing containers in a stacked manner, wherein the transfer crane has a gate shape which supports both ends of a horizontal girder with legs. The part is mounted on the main frame movable in the container yard, the first trolley movable on the horizontal girder of the main frame, the second trolley movable on the horizontal girder of the main frame, and the first trolley, The container can be lifted above the uppermost part of the stacked containers, and the hanging means for individually loading and unloading the stacked containers, and the second trolley is mounted on the container and unloaded by the hanging means. Lifting means capable of lifting and holding the container located immediately above the container to be subjected to the processing above the uppermost part of the stacked containers, and At least one of the trolley,
A transfer crane characterized in that the hanging crane or the lifting means to be mounted can pass each other while avoiding the other trolley on the cross girder when there is no load while the container is not lifted. According to the present invention, when another container is stacked immediately above the container to be unloaded, the second trolley temporarily holds the container, and the first trolley unloads the container. Do. Since the first trolley and the second trolley can pass each other on the cross beam portion when there is no load, the second trolley can be retracted to the side that does not hinder the movement of the first trolley. Second after the target container has been loaded and unloaded
Since the trolley returns from the evacuation position and returns the held container, the shuffle operation is simplified, time and labor can be saved, and work efficiency can be improved.

Further, according to the present invention, the suspension means or the lifting means mounted on one of the first and second trolleys does not interfere with one of the first and second trolleys when no load is applied. , Can be raised or inclined. According to the present invention, interference can be prevented by raising or tilting the suspending means or the lifting means, and the first trolley and the second trolley can easily pass each other.

Further, the present invention relates to a transfer crane for loading and unloading containers in a container yard for storing and stacking containers, wherein the transfer crane has a gate shape in which both ends of the cross beam are supported by legs. The part is mounted on the main frame movable in the container yard, the first trolley movable on the horizontal girder of the main frame, the second trolley movable on the horizontal girder of the main frame, and the first trolley, First suspending means capable of suspending a container up to the number of stages one less than the maximum number of stacked stages above the uppermost portion of the stacked containers, and A transfer crane characterized by including a second suspending means capable of suspending containers up to a number of stages one less than the maximum number of stacked stages above an upper portion. According to the present invention, when another container is stacked immediately above the container to be unloaded, the other trolley different from the one on which the unloading work is performed is temporarily lifted and then evacuated. The container is loaded and unloaded by one of the trolleys.
Since the first trolley and the second trolley have the same first suspending means and second suspending means, respectively, the unloading operation and the holding operation therebetween can be performed equally. After the loading / unloading of the target container is completed, the other trolley returns from the retracted position and returns the held container, so that the shuffling operation is simplified, time and labor can be saved, and work efficiency can be reduced. Can be improved.

Further, the present invention relates to an operation method of a transfer crane for loading and unloading containers in a container yard for storing containers in a stacked manner, wherein the transfer crane has a gate shape in which both ends of the cross beam are supported by legs. Two trolleys that can move along the cross beam part of the transfer crane are installed at different heights, and the trolley installed at the top is directly above the container where the trolley installed at the bottom should load and unload. The container located in the lower part is lifted and held to a position higher than the moving position of the trolley installed in the lower part, and after the trolley installed in the lower part loads and unloads the container,
An operation method of a transfer crane, characterized by returning a container held by an upper trolley to an original position. According to the present invention, when another container is stacked immediately above the container to be unloaded, the trolley installed at the top is temporarily lifted and held, and the target trolley is installed at the bottom. Loading and unloading of containers. After the loading / unloading of the target container is completed, the container held by the trolley installed at the top is returned, so that the shuffling operation is simplified, time and labor can be saved, and work efficiency is improved. be able to.

Further, the present invention relates to a method of operating a transfer crane for loading and unloading containers in a container yard for storing containers in a stacked manner, and has a gate shape in which both ends of a cross beam are supported by legs. First and second trolleys movable along the cross beam of the transfer crane are installed at the same height level, and the first trolley can lift the container above the top of the stacked containers. , The second trolley is capable of lifting and holding a container having a number of stages one less than the maximum number of stacked containers above the top of the stacked containers, the first or second trolley. At least one of the trolleys can pass each other avoiding the other trolley on the cross beam when the container is not lifted and the load is not loaded. In a state where the container is lifted immediately above the container to be loaded and unloaded, the first trolley moves laterally while holding the container while avoiding the range in which the first trolley moves for loading and unloading the container, 1
An operation method of a transfer crane, wherein a container held by a second trolley is returned to an original position after the trolley loads and unloads containers. According to the present invention, when another container is stacked immediately above the container to be unloaded, the second trolley temporarily holds the container, and the first trolley unloads the container. Do. At this time, the second trolley is laterally moved and held so as to avoid the moving range of the first trolley. Since the first trolley and the second trolley can pass each other on the cross beam part when no load is applied, the second trolley is the first trolley.
The trolley can be retracted to a side that does not hinder the movement of the trolley. After the loading / unloading of the target container is completed, the second trolley returns from the retreat position and returns the held container, thereby simplifying the shuffle operation, saving time and labor, and improving work efficiency. Can be done.

Further, the present invention relates to an operation method of a transfer crane for loading and unloading containers in a container yard for storing containers in a stacked manner, wherein the transfer crane has a gate shape in which both ends of the cross beam are supported by legs. First and second trolleys movable along the cross beam of the transfer crane are installed at the same height level, and the first and second trolleys are one stage less than the maximum number of stacked stages of the stacked containers. A container having a number of stages can be lifted and held above the top of the stacked containers, and one of the first and second trolleys is a container located immediately above the container to be unloaded. In a state of being lifted,
The other of the first or second trolley moves laterally to hold the container while avoiding the area where the other trolley moves for loading and unloading the container. After unloading, the first
Alternatively, a transfer crane operating method characterized by returning a container held by one of the second trolleys to an original position. According to the present invention, when another container is stacked immediately above the container to be unloaded, the other trolley different from the one on which the unloading work is performed is temporarily lifted and then evacuated. The container is loaded and unloaded by one of the trolleys. Since the first trolley and the second trolley can hang both individual containers and stacked containers equally, the unloading operation and the holding operation therebetween can be performed equally. After the loading and unloading of the container by one trolley is completed, the other trolley returns from the retracted position and returns the held container, so that the shuffle operation is simplified, time and labor can be saved, and Efficiency can be improved.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1, 2, 3 and 4 are
Transfer crane 2 according to a first embodiment of the present invention
0 shows a schematic configuration. 1 is a front view, FIG. 2 is a left side view, FIG. 3 is a plan view, and FIG. 4 is a front view of a portion related to holding of a container.

The transfer crane 20 has a gate-shaped main frame 21. The main frame 21 has a substantially horizontal main girder 22 as a cross beam, and both ends thereof are supported by substantially vertical legs 23 and 24. Leg 2
Tires 25 and 26 are provided at the bases of the tires 3 and 24, respectively, and are movable in a direction perpendicular to the paper surface of FIG. 1, that is, in the left and right direction of FIG. The lower installation trolley 27 that can reciprocate in the direction in which the main girder 22 extends is installed below the main girder 22. Lower installation trolley 27
Is mounted with a spreader 28 as a suspending means, and the container 29 can be individually suspended. Spreader 2
8 basically lifts the container 29 as shown in FIGS.
The technique described in FIG. 23 is applied. The movement of the container 29 is performed by being loaded on a transport vehicle such as the trailer 30.
The lower installation trolley 27 performs loading and unloading of the containers 29 between the stacked containers 29 and the trailer 30.
A rail 32 is provided on the runway girder 31 below the main girder 22 for moving the lower installation trolley 27.

At the same height as the main girder 22,
A beam rail 33 is provided, and an upper installation trolley 34 is movable. A spreader 36 as a lifting means is suspended from the upper installation trolley 34 by a wire 35. The lower end of the spreader 37 has a corner fitting lock portion 37.

As shown in FIGS. 1 and 2, the container 2
The spreader 28 holding the container 29 is lifted by the lower trolley 27 by winding up the wire 38 to a position higher than the height of the uppermost step of the container 9. Top installation trolley 3
4 can lift a two-stage container 29 smaller by one than the maximum number of stacks to a position higher than the lower installation trolley 27. As shown in FIG.
The trailer 30 for loading and moving the vehicle comprises a container loading chassis 39 and a chassis retractable tractor 40 which are separably connected. As shown in FIG. 4, the container 29 has a
An upper corner fitting 41 and a lower corner fitting 42 equivalent to the upper corner fitting 11 and the lower corner fitting 12 shown in FIG. The corner fitting lock portion 37 is displaced in and out,
A lock pin 43 is provided that can be inserted into a side hole of the upper corner fitting 41 in a protruding state, and the two-stage container 29 can be lifted simultaneously using the upper corner fitting 41.

FIGS. 5, 6, 7 and 8 show the operation of taking out the lowermost container 29 shown as A among the stacked containers 29 using the transfer crane 20 and placing it on the trailer 30. FIG. 5 shows the following operation.

(1) The lower installation trolley 27 is stopped at an arbitrary position deviated from the position immediately above the container 29 to be handled, which is indicated by A.

(2) The upper installation trolley 34 is traversed to a position immediately above the container 29 indicated by A.

(3) Wire 3 for suspending the spreader 36
5, the corner metal lock portion 37 is aligned with the position of the upper corner metal 41 shown in FIG. 4 with respect to the container 29 indicated by B, and the lock pin 43 is automatically inserted into the side hole of the upper corner metal 41. To lock.

(4) Wind the wire 35 and spreader 36
Is raised, and the containers 29 indicated by B and C are lifted in a stacked state.

FIG. 6 shows the following operation.

(5) The lower installation trolley 27 is traversed to a position immediately above the container 29 indicated by A.

(6) Unwind the wire 38 and spreader 28
Is inserted into a long hole on the upper surface of the upper corner fitting 41 of the container 29 indicated by A, and is locked by angular displacement.

(7) Wind the wire 38 and spreader 28
And the container 29 indicated by A is lifted.

FIG. 7 shows the following operation.

(8) The lower installation trolley 27 is traversed to a position just above the trailer 30.

(9) Unwind the wire 38 and spreader 28
Is lowered, the container 29 indicated by A is transferred to the trailer 30, the twist lock is unlocked, the wire 38 is wound up, and the spreader 28 is raised.

FIG. 8 shows the following operation.

(10) Unwind the wire 35 and spreader 36
Is lowered, the container 29 indicated by B and C is lowered to the ground, and the corner fitting lock portion 37 is unlocked, and FIG.
And the lock pin 43 shown in FIG.

(11) Wind the wire 35 and spreader 36
To rise.

FIGS. 9, 10, 11 and 12 show a transfer crane 50 according to a second embodiment of the present invention.
2 shows a schematic configuration of. FIG. 9 is a front view, FIGS. 10 and 11 are cross-sectional views taken along section lines XX and XI-XI in FIG. 9, and FIG. 12 is a plan view. In this embodiment, the first
Portions similar to those in the embodiment are denoted by the same reference numerals, and description thereof is omitted.

The transfer crane 50 has a gate-shaped main frame 51. The main frame 51 has a substantially horizontal main girder 52 as a horizontal girder, and both ends thereof are supported by substantially vertical legs 53 and 54. Leg 5
Tires 25 and 26 are provided at the bases of the tires 3 and 54, respectively, and are movable in a direction perpendicular to the paper surface of FIG. 9, that is, in the left and right directions of FIGS. A first trolley 55 and a second trolley 56 equivalent to the lower trolley 27 are installed so as to be able to reciprocate along the main girder 52. The spreader 36 is mounted on the second trolley 56. The spreader 36 is attached to the second trolley 56 so that the first trolley 55 and the second trolley 56 can pass each other in a state where the spreader 36 is pulled up at no load.
A frame 57 is provided for pulling up to a position higher than 5.

A lifting arm 58 extending downward from the spreader 36 and having a corner fitting lock portion 37 at the tip is provided with a lifting arm 58 shown in FIG.
Alternatively, as shown by phantom lines in FIG. 11, they can be raised or inclined, respectively, so that they do not interfere with the trolley 55 when they pass each other. In addition, two rails 5 inside and outside
A runway girder 61 for supporting 9, 60 is provided inside the main girder 52. The first trolley 55 and the second trolley 56 run on the inner rail 60 and the outer rail 59, respectively. Thus, the first trolley 55 and the second
By making it possible to pass the trolley 56,
The passage of the trailer 30 can be provided on both sides, and the required width W can be reduced. If passing is impossible,
For example, when the first trolley 55 traverses right above the trailer 30 on the right side in FIG. 9 and the container 29 is transferred, the second trolley 56 is traversed further rightward than directly above the trailer 30 and retracted. Therefore, it is necessary to increase the width W.

FIGS. 13, 14 and 15 show an operation of taking out the lowermost container 29 shown as A among the stacked containers 29 using the transfer crane 50 and transferring the container 29 to the left trailer 30. . When the container 29 is transferred to the trailer 30 on the right side, the first trolley 55 and the second trolley 56 may be moved past each other and their positions may be switched when there is no load when the container 29 is not lifted. In FIG. 13, the following operation is shown.

(1) The first trolley 55 is stopped at an arbitrary position deviating from the position immediately above the container 29 to be handled, indicated by A.

(2) The second trolley 56 is traversed to a position immediately above the container 29 indicated by A.

(3) Wire 3 for suspending the spreader 36
5, the corner metal lock portion 37 is aligned with the position of the upper corner metal 41 shown in FIG. 4 with respect to the container 29 indicated by B, and the lock pin 43 is automatically inserted into the side hole of the upper corner metal 41. To lock.

(4) Wind up the wire 35 and spread the spreader 36.
Is raised, and the containers 29 indicated by B and C are lifted in a stacked state.

FIG. 14 shows the following operation.

(5) The second trolley 56 is retracted to a position where the first trolley 55 does not hinder the lateral movement.

(6) Container 2 indicated by A for the first trolley 55
Move to the position just above 9.

(7) Unwind the wire 38 and spreader 28
Is inserted into a long hole on the upper surface of the upper corner fitting 41 of the container 29 indicated by A, and is locked by angular displacement.

(8) Wind the wire 38 and spread the spreader 28
And the container 29 indicated by A is lifted.

FIG. 15 shows the following operation.

(9) Traverse the first trolley 55 to a position just above the trailer 30.

(10) Unwind the wire 38 and spreader 28
Is lowered, the container 29 indicated by A is transferred to the trailer 30, the twist lock is unlocked, the wire 38 is wound up, and the spreader 28 is raised.

(11) Container 2 indicated by A for the second trolley 55
Return it to just above the original position of 9.

(12) Unwind the wire 35 and spreader 36
Is lowered, the container 29 indicated by B and C is lowered to the ground, and the corner fitting lock portion 37 is unlocked, and FIG.
And the lock pin 43 shown in FIG.

(13) Wind up the wire 35 and spread the wire 36.
To rise.

FIGS. 16 and 17 show a schematic configuration of a transfer crane 70 according to a third embodiment of the present invention. 16 is a front view, and FIG. 17 is a cross-sectional line X of FIG.
Sectional views as seen from VII-XVII are shown. In this embodiment, portions corresponding to the first or second embodiment are denoted by the same reference numerals, and description thereof is omitted.

The transfer crane 70 has a gate-shaped main frame 71. The main frame 71 has a substantially horizontal main girder 72 as a horizontal girder, and both ends are supported by substantially vertical legs 73 and 74. Leg 7
Tires 25 and 26 are provided at the bases of the tires 3 and 74, respectively, and are movable in a direction perpendicular to the paper surface of FIG. 16, that is, in the left-right direction of FIG. The first trolley 75 and the second trolley 56 are reciprocally movable along the main girder 72.
And the first trolley 75 is equivalent to the second trolley 56. A spreader 76 is attached to each of the first and second trolleys 75 and 56. In a state in which the containers 29 of one less than the maximum number of stacked stages are suspended, each of the two trolleys 75 and 56 is so arranged that the lower end thereof is higher than the uppermost stage of the container 29 of the maximum number of stacked stages. Is provided with a frame 57 for lifting the spreader 76.

Since the first and second trolleys 75 and 56 are equivalent, the roles of container transfer and temporary lifting are exchanged as necessary according to the position of the trailer 30 on which the container 29 is transferred. can do. Thereby, the passage of the trailer 30 can be provided on both sides, and the required width W can be reduced. If the roles cannot be exchanged, for example, when the first trolley 75 traverses right above the trailer 30 on the right side of FIG.
The second trolley 56 has to be moved to the right side of the trailer 30 and retracted to the right, and the width W needs to be increased. The operations after the roles for container transfer and temporary lifting are determined are the same as the operations as the first trolley 55 and the second trolley 56 in the second embodiment.

FIG. 18 shows a container 29 temporarily lifted by the corner fitting lock portions 37 of the spreaders 36 and 76.
The position of the corner fitting is shown. In the first, second, and third embodiments, as shown in FIG. 18A, side holes on the side surface of the upper corner fitting 41 of the lowermost container 29 in a stacked state that can be simultaneously pulled up are used. When the lowermost container 29 is raised, the container 29 immediately above it is simultaneously raised. This is the same when the lower corner fitting 42 of the lowermost container 29 is used as shown in FIG. 18 (3) and FIG.
As shown in (4), the upper corner metal fitting 41 and the lower corner metal fitting 42 of the upper and lower containers 29 can be simultaneously pulled up.

[0060]

As described above, according to the present invention, among the containers stacked in the container yard, when another container is stacked immediately above the container to be unloaded, The upper trolley lifts and holds the trolley once, and the lower trolley loads and unloads the target container. After the loading / unloading of the target container is completed, the container held by the upper trolley is returned, so that the shuffling operation is simplified, time and labor can be saved, and work efficiency can be improved.
The upper installation trolley can temporarily lift a plurality of containers at the same time, and can be lowered as it is after the work by the lower installation trolley, so that the shuffle operation can be significantly reduced.

Further, according to the present invention, when another container is stacked immediately above the container to be unloaded and loaded by the first trolley, the second trolley is temporarily lifted and held, The loading / unloading of the target container is performed by one trolley. Since the first trolley and the second trolley can pass each other on the cross beam portion when there is no load, the second trolley can be retracted to the side that does not hinder the movement of the first trolley. After the loading / unloading of the target container is completed, the second trolley returns from the retreat position and returns the held container, thereby simplifying the shuffle operation, saving time and labor, and improving work efficiency. Can be done.

According to the present invention, interference can be prevented by raising or tilting the suspending means or the lifting means, and the first trolley and the second trolley can easily pass each other. The first and second trolleys movable with respect to the part can be used properly.

Further, according to the present invention, when another container is stacked immediately above the container to be unloaded, the other trolley, which is different from one of the trolleys on which the unloading operation is performed, is temporarily stopped. The container is lifted and held, and the target container is loaded and unloaded by one of the trolleys. Since the first trolley and the second trolley have the same first suspending means and second suspending means, respectively, the unloading operation and the holding operation therebetween can be performed equally. After the loading / unloading of the target container is completed, the other trolley returns from the retracted position and returns the held container, so that the shuffling operation is simplified, time and labor can be saved, and work efficiency can be reduced. Can be improved.

Furthermore, according to the present invention, when another container is stacked immediately above the container to be unloaded and unloaded, the transfer crane is temporarily held by the trolley installed at the top, The trolley installed at the bottom is operated to load and unload the target container. After the loading / unloading of the target container is completed, the container held back without any lateral movement by the trolley installed at the top is returned, which simplifies the shuffling operation and saves time and effort. , Work efficiency can be improved.

Furthermore, according to the present invention, when another container is stacked immediately above the container to be unloaded, the second trolley is temporarily lifted and held, and the first trolley is used to hold the container. Unloading.
At this time, the second trolley is laterally moved and held so as to avoid the moving range of the first trolley. Since the first trolley and the second trolley can pass each other on the cross beam portion when there is no load, the second trolley can be retracted to the side that does not hinder the movement of the first trolley. After the loading / unloading of the target container is completed, the second trolley returns from the retreat position and returns the held container, thereby simplifying the shuffle operation, saving time and labor, and improving work efficiency. Can be done.

Furthermore, according to the present invention, when another container is stacked immediately above the container to be unloaded, the other trolley, which is different from the one trolley on the side of the unloading operation, is once used. The container is lifted, retracted and held, and the target container is loaded and unloaded by one of the trolleys. Since the first trolley and the second trolley can hang both individual containers and stacked containers equally, the unloading operation and the holding operation therebetween can be performed equally. After the loading / unloading of the container by one trolley on the side suitable for loading / unloading is completed, the other trolley returns from the retracted position and returns the held container, so that the shuffle operation is simplified, and time and labor are reduced. Can be omitted, and the working efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a first embodiment of the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is a partial front view in the vicinity of a corner fitting lock portion 37 of FIG. 1;

FIG. 5 is a front view showing the operation of the transfer crane 20 of FIG.

FIG. 6 is a front view showing the operation of the transfer crane 20 of FIG.

FIG. 7 is a front view showing the operation of the transfer crane 20 of FIG.

FIG. 8 is a front view showing the operation of the transfer crane 20 of FIG.

FIG. 9 is a schematic front view of a second embodiment of the present invention.

FIG. 10 is a side sectional view taken along the line XX of FIG. 9;

FIG. 11 is a side cross-sectional view as seen from the section line XI-XI of FIG. 9;

FIG. 12 is a plan view of FIG. 9;

FIG. 13 is a front view showing the operation of the transfer crane 50 of FIG.

FIG. 14 is a front view showing the operation of the transfer crane 50 of FIG.

FIG. 15 is a front view showing the operation of the transfer crane 50 of FIG.

FIG. 16 is a schematic front view of a third embodiment of the present invention.

FIG. 17 is a side sectional view taken along the line XVII-XVII of FIG. 16;

FIG. 18 shows a container 2 that can be used in carrying out the present invention.
9 is a simplified side view showing a combination of an upper corner metal fitting 41 and a lower corner metal fitting 42. FIG.

FIG. 19 is a schematic front view showing the configuration and operation of the related art.

FIG. 20 is a perspective view showing a configuration for lifting a container by a conventional spreader.

FIG. 21 is a perspective view showing a schematic configuration of an upper corner fitting and a twist lock of FIG. 20;

FIG. 22 is a diagram showing a shape of an upper corner fitting specified in JIS Z1616.

FIG. 23 is a diagram showing a shape of a lower corner fitting specified in JIS Z1616.

[Explanation of symbols]

 20, 50, 70 Transfer crane 21, 51, 71 Main frame 27 Lower installation trolley 28, 36, 76 Spreader 29 Container 30 Trailer 31, 61 Runway girder 34 Upper installation trolley 35, 38 Wire 37 Corner fitting lock part 41 Upper corner fitting 42 Lower corner fitting 43 Lock pin 55, 56, 75 Trolley 57 Lifting frame 58 Lifting arm

Claims (7)

[Claims] 1. A transfer crane for loading and unloading containers in a container yard for storing and stacking containers, wherein the transfer crane has a gate shape that supports both ends of a cross beam with legs. It is movable in the yard, and 2
A main frame in which book rails are vertically spaced from each other, a lower installation trolley that allows the main frame to move along the lower rail, and an upper installation trolley that allows the main frame to move along the upper rail. Suspending means for loading and unloading stacked containers individually mounted on the lower trolley, and a container mounted on the upper trolley and located directly above the container to be unloaded by the suspending means And a hoisting means capable of hoisting and holding the hoist to a position higher than the moving position of the trolley installed below. 2. A transfer crane for loading and unloading containers in a container yard for storing and stacking containers, wherein the transfer crane has a gate shape that supports both ends of a cross beam with legs. A main frame movable in the yard, a first trolley capable of moving the horizontal beam of the main frame, a second trolley movable of the horizontal beam of the main frame, mounted on the first trolley and stacked The container can be lifted above the uppermost part of the container, and the hanging means for individually loading and unloading the stacked containers, and the container should be mounted on the second trolley and should be unloaded by the hanging means The container located directly above the container,
Lifting means that can be lifted and held above the top of the stacked containers, wherein at least one of the first and second trolleys is mounted with the hanging means or the lifting means that lifts the container. A transfer crane characterized by being able to pass each other while avoiding the other trolley on the cross beam when there is no load. 3. The suspension means or the lifting means mounted on one of the first and second trolleys is raised or lowered so as not to interfere with one of the first and second trolleys when there is no load. The transfer crane according to claim 2, wherein the transfer crane can be inclined. 4. A transfer crane for loading and unloading containers in a container yard for storing and stacking containers, wherein the transfer crane has a gate shape that supports both ends of a cross beam with legs. A main frame movable in the yard, a first trolley capable of moving the horizontal beam of the main frame, a second trolley movable of the horizontal beam of the main frame, mounted on the first trolley and stacked First suspending means capable of suspending a container up to the number of stages one less than the maximum number of stacked stages above the uppermost portion of the container, and mounting the second trolley on the uppermost portion of the stacked containers. A transfer crane, comprising: a second suspending means capable of suspending containers up to one stage less than the maximum number of stacked stages. 5. A method of operating a transfer crane for loading and unloading containers in a container yard where containers are stacked and stored, wherein the transfer crane has a gate shape in which both ends of a cross beam are supported by legs. Two trolleys that can move along the cross beam are installed at different heights, and the trolley installed at the top is located directly above the container where the trolley installed at the bottom should be loaded and unloaded. The container is lifted and held to a position higher than the moving position of the trolley installed in the lower part, and the trolley installed in the upper part holds after the trolley installed in the lower part loads and unloads the container. A method for operating a transfer crane, comprising returning the container to its original position. 6. A method of operating a transfer crane for loading and unloading containers in a container yard for storing and stacking containers, the transfer crane having a gate shape supporting both ends of a cross beam with legs. First and second movable parts along the cross beam
The trolley is installed at the same height level, the first trolley can lift the container above the uppermost part of the stacked containers, and the second trolley can be higher than the maximum number of stacked stages of the stacked containers. Can also be lifted and held above the top of the stacked containers, and at least one of the first and second trolleys is free of load when the containers are not lifted. It is possible to pass each other avoiding the other trolley on the cross beam part, and the second trolley lifts the container located immediately above the container to be loaded and unloaded by the first trolley,
The first trolley moves laterally to hold the container while avoiding the range in which the trolley moves for loading and unloading the container, and after the first trolley loads and unloads the container, the second
A method for operating a transfer crane, comprising returning a container held by a trolley to an original position. 7. A method of operating a transfer crane for loading and unloading containers in a container yard for storing and stacking containers, the transfer crane having a gate shape supporting both ends of cross beams with legs. First and second movable parts along the cross beam
The trolleys are installed at the same height level, and the first and second trolleys move the containers having the number of stages one less than the maximum number of the stacked containers above the top of the stacked containers. Each of the first and second trolleys can be lifted and held, and the other of the first and second trolleys is lifted while a container located immediately above the container to be unloaded is lifted. The container moves laterally while avoiding an area to be moved for loading and unloading the container, and holds the container. After the other of the first or second trolleys performs loading and unloading of the container, the first or the second An operation method of a transfer crane, wherein a container held by one of the second trolleys is returned to an original position.