JPH10338466A - Crane for harbor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crane for a harbor, having good continuity of the traveling movement and cargo handling work. SOLUTION: Crawler-type traveling devices 5 are provided on both end sides of respective sill beams of a sea side leg 1 and a land side leg 2 for supporting a jib 3, the crawler-type traveling devices 5 are grounded to the floor 102 of a quay without generating the vertical floating caused by deformation or floating by mechanical connection of frames of the crawler-type traveling devices 5, a driving wheel, a driven wheel and clawlers and the weight during stopping and traveling, and therefore, height displacement by supporting load, to be generated between the crawler-type traveling devices 5 is prevented. Therefore, fixing of a crane is dispensed with in performing cargo handling work by stopping the crane, a spreader 11 suspending a container 100 can be safely and vertically moved, and a traverse trolley 9 can be safely and laterally moved on the jib 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a port crane for loading and unloading containers and the like at a port.

[0002]

2. Description of the Related Art Main ports are mainly used for handling containers transported by ships and the like. For this reason, in major ports, the handling volume of containers is extremely large, and a large amount of cargo handling work is required. Therefore, in order to support the distribution of containers that tend to concentrate at major ports, in recent years, it has been promoted to distribute container handling operations to nearby local ports. However, at each local port, independent cargo handling machines are being installed in order to cope with an increase in cargo handling volume, since cargo handling is carried out simply by mainly using a ship crane or a truck crane.

As shown in FIG. 6, for example, such a cargo handling machine is provided with a horizontal retractable tower type jib crane 50 provided with a plurality of sets of tire traveling devices 51 and a plurality of outrigger columns 52. As shown in FIG. 7, a simple type of crane in which the running track is omitted, such as one in which a plurality of sets of tire running devices 61 and a plurality of outrigger columns 62 are provided at both lower ends of a bridge-shaped leg of a container crane 60. Has been applied.

[0004]

However, in each of the simple cranes 50 and 60 described above, if the lifted containers are moved while traveling, the tire traveling devices 51 and 61 will bend differently. However, there is a possibility that the stability may be deteriorated. For this reason, each of the above cranes 5
At 0, 60, when the cargo handling work is performed, after stopping at the cargo handling work position, the outrigger posts 52, 62 are lowered and landed to be in a fixed state, and then the container is lifted to perform the cargo handling work. After stopping the work and pulling the jib etc. to the center position, the outrigger support 5
2 and 62 must be lifted off and taken to the released state, and then traveled by the tire traveling devices 51 and 61. Therefore, when the cargo handling work position changes frequently, the cargo handling work must be temporarily stopped and moved each time, so that the work efficiency is poor.

[0005] In view of the above, an object of the present invention is to provide a port crane with good continuity between traveling movement and cargo handling work.

[0006]

A port crane according to the present invention for solving the above-mentioned problems is a port crane provided with traveling means for traveling on a floor at a front side and a rear side in a traveling direction. The traveling means is a crawler type traveling device.

The above-mentioned harbor crane is characterized in that an equalizer device for equilibrating a load applied to the crawler type traveling device on the front side and the rear side in the traveling direction is provided.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a port crane according to the present invention will be described with reference to FIGS. FIG. 1 is a side view showing the entire structure, and FIG.
2 is a sectional view taken along the line II-II, and FIG. 3 is an enlarged enlarged view of the lower part of FIG.

In FIGS. 1 and 2, 1 is a seaside leg, 2 is a land leg, and these legs 1 and 2 are rigidly connected respectively. A main girder 3 is supported horizontally on the legs 1 and 2. A sill beam 4 is provided at the lower end of each of the legs 1 and 2. Reference numeral 5 denotes a crawler-type traveling device which is a traveling means. As shown in FIG. 3, a saddle 7 provided at an upper central portion of the traveling device has a shaft 8 attached to saddle brackets 6 at both ends of the sill beam 4 of each of the legs 1 and 2. Each of the legs 1 and 2 is swingably connected to each other, and is driven synchronously by a driving device (not shown) mounted on the legs 1 and 2.

In FIGS. 1 and 2, reference numeral 9 denotes a transverse trolley, which is attached to the main girder 3 so that the main girder 3 can be driven horizontally in a horizontal direction. 10
Is a hoisting rope, which is provided on the traversing trolley 9 and is extended from the trolley 9. Reference numeral 11 denotes a spreader, which is supported by the traversing trolley 9 via the hoisting cable 10 so that the container 100 can be gripped. In the figure, 101 is a ship, and 102 is a quay floor.

In such a port crane, the conventional crawler-type traveling device 5 uses the mechanical connection and weight of the crawler-type traveling device 5 including the frame, the driving wheels and the driven wheels, the caterpillars, etc., both when the vehicle is stopped and when traveling. The crawler-type traveling device 5 comes into contact with the quay floor 102 without causing vertical movement due to deformation or lifting, and the four crawler-type traveling devices 5 are always supported. No height displacement occurs between the devices 5 due to the supporting load.

For this reason, it is not necessary to fix the crane using the outrigger supports or the like when the crane is stopped and the cargo work is performed, so that the spreader 11 on which the container 100 is hung while the crane is stopped and traveling can be safely moved. The trolley 9 can be moved up and down and the trolley 9 can be safely traversed on the main girder 3.

That is, cargo handling work is performed in a state where the crane is stopped without fixing the crane with the outrigger supports or the like, and the container 100 is grabbed or released by the spreader 11, and then the crane is immediately moved. The trolley 9 can move the container 100 up and down or move it horizontally.

Therefore, according to such a port crane, the traveling movement and the cargo handling work can be performed smoothly and continuously, so that the working efficiency can be greatly improved.

A second embodiment of the port crane according to the present invention will be described with reference to FIGS. FIG.
FIG. 5 is an enlarged view of the lower part, and FIG. 5 is an enlarged view of the main part of FIG. However, the same members as those in the first embodiment described above are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

In this embodiment, the equalizer device 2 is provided between the crawler traveling device 5 of one leg (for example, the land leg 2) in the port crane of the first embodiment described above.
0 is provided. As the equalizer device 20,
For example, those disclosed in Japanese Utility Model Publication No. 6-1587 can be applied. In the leg (land side leg 2) provided with such an equalizer device 20, the sill beam 14 is disposed at a position higher than the other leg (sea side leg 1).

Here, the equalizer 20 will be described with reference to FIGS. Reference numeral 16 denotes a saddle bracket, which protrudes from lower surfaces on both ends of the sill beam 14. Reference numeral 17 denotes a saddle, which protrudes above the crawler traveling device 5.

In FIGS. 4 and 5, reference numeral 21 denotes an equalizer beam which is disposed in a pair on both ends of the sill beam 14 and whose center is rotatably connected to the saddle 17 via a shaft 22. The outer side is rotatably connected to the saddle bracket 16 via a shaft 23. 2
Reference numerals 4 and 25 denote brackets, and the equalizer beam 2
1 are respectively protruded. 26 is a tie rod, one end of which is rotatably connected to the bracket 24,
The other end is rotatably connected to the bracket 25. Reference numeral 27 denotes a hydraulic cylinder, and the equalizer beam 21
Are provided in pairs so as to connect between the inner end of the sill beam and the lower surface of the sill beam 14.

The hydraulic cylinder 27 is provided with an electromagnetic shut-off valve in an external conduit communicating with the head side and the rod side.
The hydraulic cylinder 27 is opened so as to operate, and is closed so as to lock the hydraulic cylinder 27 when the traveling of the crane stops.

In the port crane provided with such an equalizer device 20, the electromagnetic shut-off valve is opened during traveling and the stroke of the piston of the hydraulic cylinder 27 is free, so that the crawler traveling device 5 on the front side in the traveling direction can be used. Floor 102
When it sinks into the depressed portion of the vehicle, a large load is temporarily applied to the equalizer beam 21 on the rear side in the running direction, and the equalizer beam 21 rotates so that the outer side is pushed down, and the equalizer beam 21 is moved through the tie rod 26 in the running direction. When the equalizer beam 21 on the front side is driven, the loads applied to the floor 102 from the crawler-type traveling devices 5 on both sides in the traveling direction are balanced.

When the crane stops running in this state, the electromagnetic shut-off valve is closed, the hydraulic cylinder 27 is locked, and the free stroke of the piston is restrained.
The height from 2 to the saddle bracket 16 is fixed.

As a result, since the saddle bracket 16 is in a fixedly supported state, even if the bridge-type structure including the legs 1 and 2 receives a bending moment load in any direction, the bridge-type structure and The entire crawler traveling device 5 evenly shares the bending moment load.

Since the above-described equalizing mechanism of the equalizer device 20 is necessary only when the crane travels on the uneven portion of the floor 102, there is no need to mechanically lock the equalizing mechanism when the crane stops traveling. there is no problem.

Therefore, according to such a port crane, it is possible to obtain the same effect as that of the first embodiment described above, as well as the floor 102.
When traveling on uneven portions of the floor, the load of the crane is evenly supported by each traveling device 5, and when stopped, the bending moment load can be shared by the bridge-type structure and the crawler-type traveling device 5 as a whole. Even if there is an uneven portion, it is possible to prevent overturning and the like, and to improve safety.

The port crane according to the present invention is not limited to the container crane described above, but may be any of various types of cranes used on the quay.

[0026]

The port crane according to the present invention is a port crane provided with traveling means for traveling on the floor at the front side and the rear side in the traveling direction, and the traveling means is a crawler traveling apparatus. The crawler-type traveling device is grounded on the floor without any vertical movement due to deformation or lifting during stopping or traveling, and each crawler-type traveling device is always supported. No height displacement due to the support load occurs. For this reason, it is not necessary to fix the crane when stopping the crane and performing the cargo handling work, so that the traveling movement and the cargo handling work can be smoothly and continuously performed, and the working efficiency can be greatly improved. .

In addition, since the equalizer device is provided to balance the load applied to the crawler type traveling device in the forward direction and the backward direction in the traveling direction, the load of the crane can be applied to each traveling device even if the floor has irregularities. Since it is evenly supported, it is possible to prevent a fall or the like, and to improve safety.

[Brief description of the drawings]

FIG. 1 is a side view showing the overall structure of a first embodiment of a port crane according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an enlarged enlarged view of the lower part of FIG. 2;

FIG. 4 is an extracted enlarged view of a lower portion of the second embodiment of the harbor crane according to the present invention.

FIG. 5 is an enlarged view of a main part extracted from FIG. 4;

FIG. 6 is a schematic configuration diagram of an example of a conventional simple port crane.

FIG. 7 is an extracted enlarged view of a main part of another example of a conventional simplified harbor crane.

[Description of Signs] 1 Seaside leg 2 Landside leg 3 Main girder 4,14 Sill beam 5 Crawler traveling device 6,16 Saddle bracket 7,17 Saddle 8 Axis 9 Traversing trolley 10 Hoisting cable 11 Spreader 20 Equalizer device 21 Equalizer Beam 22, 23 Axis 24, 25 Bracket 26 Tie rod 27 Hydraulic cylinder 100 Container 101 Ship 102 Floor

Claims (2)

[Claims] 1. A port crane provided with traveling means for traveling on a floor at a front side and a rear side in a traveling direction, wherein the traveling means is a crawler type traveling apparatus. 2. The harbor crane according to claim 1, further comprising an equalizer device that balances a load applied to the crawler-type traveling device in a forward direction and a rearward direction in a traveling direction.