JPS6111875B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for correcting the inclination of a lifting beam, and more particularly to a device for correcting the inclination of a lifting beam suspended by four wire ropes suitable for use in cargo handling of marine containers, etc. It is.

1 to 3, an outline of a container crane having a lifting beam to which the present invention is applied, the conventional technology, and the problems thereof will be explained.

In each figure, 12 is a lifting beam with a special attachment/detachment device for hanging containers.

Reference numerals 13, 14, 15, and 16 are wire ropes for hoisting containers. One end of each rope is wrapped around a hoisting drum 17 installed in the machine room 40 of the crane, and the other end is wrapped around a hoisting drum 17 installed in the machine room 40 of the crane. A sheave 18 installed at the rear, a sheave 19 installed on a trolley 42 that moves on a girder 41 and a boom 43, and a sheave 2 fixed on a lifting beam 12 suspended from the bottom of the trolley 42.
0, sheave 21 fixed to trolley 42, boom 4
After sequentially passing through the fixed sheave 22 at the tip of 3,
It is similarly fixed to a wire rope fixing device 23 installed at the tip of the boom 43.

Note that the wire rope fixing device 23 is not a device that simply fixes the wire rope, but also a device that fixes the lifting beam 12 at an inclination as shown by the chain line in FIG.
The trim adjust function gives the lifting beam 12 an inclination as shown by the chain line in Figure 3.
In some cases, it is a device that has a wrist adjust function to give a trim adjustment, and when performing trim adjustment, wire ropes 13 and 14 or 15 and 16 are each set as one set, and each set is hoisted up and down in opposite directions at the same time. In the case of lift adjustment, the wire ropes 13 and 15 or 14 and 16 are each set as a set, and each set is hoisted up and down in opposite directions at the same time.

Also, the wire ropes 13, 14, 15, and 16 are connected to the lifting beam 1 due to the difference in rope length.
2 to avoid unbalanced tilt and twist.
Precise length adjustment is performed during rope reaving.

However, wire ropes undergo permanent elongation due to changes over time during operation, and the elongation rate is not uniform depending on the twist of the wire rope, tension, etc.

In particular, in container cranes where the wire ropes are long and unbalanced repeated impact loads are applied to each wire rope due to sudden ground cutting or swinging of the container during operation, the wire rope length changes significantly due to the difference in elongation rate. , and occur within a relatively short period of time.

In this case, four wire ropes 13, 14, 1
Since the lengths of the lifting beams 5 and 16 are different, even if the above-mentioned trim adjust device or rest adjust device is installed, the lengths of the two wire ropes can be adjusted simultaneously. It is not possible to correct the torsion that occurs around the diagonal axis of the lifting beam 12, and therefore it becomes difficult to attach and detach the lifting beam 12 and the container, which has a large negative effect on speeding up cargo handling.

However, until now, there has been no example equipped with a device for correcting the inclination of the lifting beam 12 caused by the unbalanced stretching of the four wire ropes, and the correction method has been to fix one end of the wire rope with a rope clamp. Means were used to adjust the length of the wire ropes 13, 14, 15, 16 on the hoisting drum 17.

This method includes wire ropes 13, 14, 15,
Remove the rope clamp fixing one end of each wire rope, and adjust the length of each wire rope to the hoisting drum 1.
7, but when removing the rope clamp, the wire ropes 13, 1
4, 15, and 16 must be temporarily fixed by another method, and the work setup is extensive, so this method requires several workers and a long time.

Therefore, not only when corrections are forced during cargo handling, but also at times other than cargo handling, the time loss is significant.
This method was also problematic in terms of safety, as the work involved the risk of falling off.

The purpose of the present invention is to minimize the adverse effects on cargo handling caused by changes in the posture of the lifting beam caused by the unavoidable property of permanent elongation inherent in wire ropes, in a short time and safely. The object of the present invention is to provide a device capable of correcting the amount of elongation.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings shown in FIGS. 4 to 8.

The tilt correction device 24 of the lifting beam 12 according to the present invention is also installed at the tip of the boom 43 as an alternative to the conventional wire rope fixing device 23 shown in FIG.

In FIGS. 7 and 8, 25 is a guide rail fixed to the boom body, and 26 is a moving frame that can move on the guide rail 25 in the left-right direction in FIG.

A rack 27 is attached to the lower part of the moving frame 26 and meshes with a rack pinion 28.

A prime mover 29 has a brake and drives the rack pinion 28 via a power transmission device 30.

The equalizing beam 31 is connected to the movable frame 26 by a pin 33, and one end of the wire ropes 13, 14 is fixed on both sides of the equalizing beam 31 at equal distances from each pin 33.

The equalizing beam 32 is connected to the movable frame 26 by a pin 34, and one end of the wire ropes 15, 16 is fixed on both sides of the equalizing beam 32 at equal distances from each pin 34.

The support rod 35 has one end connected to the horizontal extension of the movable frame 26 and the other end connected to the equalization beam 31, and the equalization beam 31 is connected to the pin 33.
It is what supports the rotation around the
At the joint with the moving frame 26, the support rod 3
5 has a male thread of a certain length, and a nut 39 is attached to a rotating joint 37 attached to the moving frame 26.
The structure is such that it is fixed in place.

Further, the equalizing beam 31 and the support rod 35 are also connected by a rotating joint 38.

Therefore, by rotating the nut 39, the support rod 35 can be expanded and contracted.
The equalized beam 31 is expanded and contracted by the support rod 35.
can be forced to rotate around a certain angle pin 33.

Like the support rod 35, the support rod 36 is connected at one end to the moving frame 26 and at the other end to the equalization beam 32, and each connection portion has the same structure as each connection portion of the support rod 35.

Since this embodiment is configured as described above,
By retracting the support rod 35 and rotating the equalizing beam 31 counterclockwise, the wire rope 13
is lowered and at the same time the wire rope 14 is raised.

Furthermore, by extending the support rod 35 and rotating the equalizing beam 31 clockwise, the wire ropes 13 and 14 perform the opposite operations described above.

On the other hand, the wire ropes 15 and 16 fixed to the equalization beam 32 by the expansion and contraction of the support rod 36
performs the same operation as the wire ropes 13 and 14 described above.

Furthermore, when the movable frame 26 is moved to the left in FIG. 7 with the support rods 35 and 36 fixed with nuts 39 so that the equalization beams 31 and 32 do not rotate, a set of two wire ropes 13, 14 are lowered at the same time, and a pair of wire ropes 15, 16 are raised at the same time.

Moreover, when the moving frame 26 is moved upward in FIG. 7, the wire ropes 13, 14 and 15,
6 performs the opposite operation to the case of downward movement described above.

Hereinafter, a method of correcting the lifting beam inclination according to this embodiment will be explained based on FIGS. 4 to 6.

In each figure, solid lines represent four wire ropes 1
The lengths of 3, 14, 15, and 16 are adjusted appropriately,
The lifting beam 12 is shown in a state where there is no inclination or twist, and the container 44 is also placed on the ground or on a ship in the same state, so the lifting beam 12 and the container 44 are in the easiest state to attach and detach. .

Chain lines indicate wire ropes 13, 14, 15, 16
This shows an example of a state in which the lifting beam 12 is tilted and twisted due to the unbalanced elongation of the wire. This occurs when the amount of elongation of the wire rope 15 is greater than that of the rope 16, and the amount of elongation of each wire rope 13 and 15 and each wire rope 14 and 16 is not equal.

In order to correct this complicated inclination and twist and return to the state shown by the solid line, in the device according to this embodiment, first, by extending the support rod 35, the equalizing beam 31 is moved clockwise by the necessary angle. When rotated, the wire rope 13 is raised and the wire rope 14 is lowered at the same time, so that the inclination shown in FIG. 5 can be corrected.

Next, the support rod 36 is shortened and the equalized beam 3
2 by a necessary angle in the counterclockwise direction, the wire rope 15 is raised and the wire rope 16 is lowered at the same time, thereby correcting the inclination shown in FIG. 6.

By rotating the equalizing beams 31 and 32, the lifting beam 12 is returned to the state shown by solid lines in FIGS. 5 and 6, with no inclination or deviation with respect to the container 44, and then in the trim adjust direction. Perform tilt correction.

The inclination in the trim adjust direction is determined by adjusting the support rod 3 so that the equalization beams 31 and 32 do not rotate.
5 and 36 are fixed by nuts 39, and move the movable frame 26 to the left in FIG. 7, the wire ropes 13 and 14 are simultaneously lowered and the wire ropes 15 and 16 are simultaneously raised, thereby making corrections. I can do it.

Therefore, adjustment of the length of each pair of wire ropes by rotating the equalizing beams 31 and 32, and subsequent movement of the movable frame 26, can easily cause the difference in the amount of elongation of the four wire ropes. The inclination and twist of the lifting beam 12 can be corrected.

Further, the device of the present invention has wire ropes 13, 14.
is one equalized beam 31, wire rope 1
5 and 16 are connected to both ends of one equalizing beam 32, the wire rope tension due to the weight of the hanging load such as the lifting beam is balanced, and therefore the length of the wire ropes 13, 14, 15, and 16 is It has the function of not receiving drag due to the weight of the suspended load during adjustment.

As another embodiment of the present invention, the extension and contraction operations of the support rods 35 and 36 that rotate the equalization beams 31 and 32 are driven by a prime mover, and remote correction from the crane operating room is possible. An example in which a restore adjust function is provided by additionally configuring the rods 35 and 36 so that they can be expanded and contracted by the same amount at the same time, and as a mechanism for rotating the equalization beams 31 and 32. There is an example in which a gear is attached and the gear is driven by a driving transmission device such as a rack. In addition, equalized beams 31 and 32
Adopts a wire rope winding drum instead of
By combining this with a mechanism that rotates the wire rope winding drum, it is possible to increase the correction allowance and facilitate the adjustment of each wire rope length required during rope reaving.

As described above, by using the device according to the present invention, it is possible to correct the torsion and inclination of a lifting beam lifted by a plurality of ropes each having a different amount of elongation, so that the lifting beam can always be kept in a normal posture. It has an effect that can be operated with.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a container crane suitable for applying one embodiment of the present invention, FIG. 2 is a side view taken along AA in FIG. 1, and FIG. 3 is a side view taken along BB in FIG. 1. ,
Figure 4 is a correlation diagram of the lifting beam and container in normal and abnormal conditions, and Figure 5 is C in Figure 4.
-C side view, FIG. 6 is a DD side view in FIG. 4, FIG. 7 is a plan view showing a correction device according to an embodiment of the present invention, and FIG. 8 is a sectional view taken along EE in FIG. 7. It is. 13, 14, 15, 16...Wire rope, 25
...Guide rail, 26...Moving frame, 27...Rack, 28...Rack pinion, 31, 32...Equalizing beam, 35, 36...Support rod, 37, 38
...Rotating joint, 39...Natsuto.

Claims (1)

[Claims] 1 A rack 27 is provided on a frame 26 movable along a straight guide rail 25, and the rack 27
A drive pinion 28 that meshes with 7 is provided on the guide frame 25 side, and the two equalizing beams 3
1 and 32 are provided on the movable frame 26 so as to be rotatable about their longitudinal centers, and a support rod 3 having a screw is provided between the ends of the respective equalizing beams 31 and 32 and the movable frame 26.
Wire ropes 13 and 1 are connected by wire ropes 5 and 36 and are provided so that the lengths of the support rods 35 and 36 can be changed, and the lifting beams 12 are suspended from respective ends of the two equalizing beams 31 and 32.
A lifting beam tilt correction device characterized in that 4, 15, and 16 are fixed.