JP2000255974A - Rocking restraining apparatus for head block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain rocking of a head block to facilitate alignment between a container guide and a container, so as to efficiently conduct cargo handling work for the container. SOLUTION: This apparatus is a rocking restaining apparatus for a head block 3 of a container crane, in which a container 14 is hoisted up or lowered down by a spreader 9 suspended via the head block 3 in a trolley 2 moving on a crane boom 1, and the apparatus is provided with a brake for applying frictional force to a sheave 6 arranged on the head block 3, so as to regulate rotation of the sheave 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head block locking suppressing device.

[0002]

2. Description of the Related Art A container crane travels on a traveling rail laid along a quay and loads or unloads a container with a container ship berthing. On the upper part of the legs of the container crane, there is a girder provided horizontally so as to be orthogonal to the traveling rail and a boom provided so as to protrude toward the sea side of the girder and connected rotatably in a vertical direction. Is provided. When the container ship berths, the boom stands upright so as not to obstruct the berthing, and when loading and unloading, it is held horizontally so as to protrude above the container ship. As shown in FIG.
A traveling rail 4 is laid on the boom 1 of the container crane, and a trolley 2 is provided on the traveling rail 4 so as to be movable via wheels 2a. The head block 3 is suspended from the trolley 2 by a rope 12, and can be moved up and down by a hoisting device provided on a land side on a girder (not shown). 4 on the lower surface of the head block 3.
A spreader 9 which is a hanging tool of the container 14 provided with a flipper 9a at a corner is detachably provided.

[0003]

However, in the above-mentioned conventional head block, when the spreader is lowered to above the container and the container is to be gripped, the head block is suspended due to a change in the sag of the left and right ropes suspending the head block. Locking occurs in which the whole swings about the longitudinal horizontal axis, and the flipper (container guide) does not smoothly contact the four corners of the container, making it difficult to align the container guide with the container and improving the efficiency of container handling. There are problems such as bad.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and suppresses the locking of the head block, facilitates the alignment between the container guide and the container, and improves the efficiency of the container handling operation. It is an object of the present invention to provide a head block locking suppressing device for realizing the locking.

[0005]

According to the present invention, there is provided a locking device for a head block which lifts and lowers a container by a spreader suspended via a head block on a trolley moving on a crane boom. A locking device for a head block provided with a brake for adjusting the rotation of the sheave by applying a frictional force to the sheave disposed on the head block.

[0006] It is preferable that the above-mentioned locking suppressing device comprises a disk provided on a sheave shaft and a brake for bringing a frictional force into contact with the disk.

[0007] The locking suppressing device may be constituted by a brake for applying a frictional force across the side surface of the sheave.

Next, the operation of the present invention will be described. When hoisting the container, the head block suspended by the rope is lowered and the spreader is lowered onto the container. The hoisting and lowering of the rope is performed by a hoisting device (not shown) provided on the land side on the girder. When the spreader grips the container, the spreader is guided by container guides provided at four corners of the spreader to align the spreader with the container, and a container tightening device provided at the four corners of the lower surface of the spreader (see FIG. (Not shown) to grip the container. When the spreader is lowered above the container and stopped, rocking in which the whole head block swings around the horizontal axis in the longitudinal direction may occur due to the change in sag of the left and right ropes hanging the head block, When locking occurs, the sheave is braked to apply frictional force, thereby converting the kinetic energy into heat energy and dissipating it to suppress locking, so that the container guide and the container are aligned. Therefore, the efficiency of the cargo handling operation of the container can be improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a trolley and a head block according to the present invention. FIG. 2 is a side view of the locking device of the head block.

In FIG. 1, reference numeral 1 denotes a boom of a container crane. Reference numeral 2 denotes a trolley movably provided on a traveling rail 4 laid on the boom 1 via wheels 2b. 3
Denotes a head block, and a sheave 6 and a trolley 2 provided on the upper surface.
It is suspended by a rope 12 wound around a sheave 5 provided thereon, and is raised and lowered by a hoisting device (not shown) provided on the land side on the girder. Sheave 6
Is fixed to a sheave shaft 7, and the shaft 7 is supported by a bearing 8. A total of four pairs are provided at the four corners of the upper surface of the head block 3 in pairs. Reference numeral 9 denotes a spreader detachably provided on the lower surface of the head block 3.
When gripping the container 4, a container guide (flipper) 9a for guiding the container 14 is pivotally supported. At four corners on the lower surface of the spreader 9, twist lock type container tightening devices (not shown) for gripping the container 14 are provided.

Reference numeral 10 denotes a locking suppressing device, which comprises a disc 10a provided at the end of the sheave shaft 7 and a brake 11 for applying frictional force by interposing the disc 10a therebetween as shown in FIG. The friction force of the brake 11 is
The rotation of the sheave 6 is adjusted by a command sent from a control device (not shown) and the frictional force is adjusted. If the brake 11 is acted on suddenly, slippage occurs between the sheave 6 and the rope 12 and the life of the rope 12 is shortened.

[0012] A locking suppressing device according to claim 3.
As shown by a dashed line in FIG. 2, a brake 11 is provided which adjusts the rotation of the sheave 6 by applying a frictional force to the side surface of the sheave 6 instead of contacting the disk 10a with the disk 10a interposed therebetween. The other configuration is the same as the above-described configuration, and a duplicate description will be omitted.

Next, the operation of this embodiment will be described. When hoisting the container 14, the head block 3 hung on the rope 12 is lowered, and the spreader 9 is lowered onto the container 14. The hoisting and lowering of the rope 12 is performed by a hoisting device (not shown) provided on the land side on the girder 1. When the spreader 9 grips the container 14, the spreader 9 is guided by container guides 9 a provided at four corners of the spreader 9, and
Tightening devices (not shown) provided at the four corners on the lower surface of the spreader 9 for aligning the container with the container 14.
To grip the container. Spreader 9 in container 1
4 When the head block 3 is lowered and stopped, a change in sag of the right and left ropes 12 hanging the head block 3 may cause rocking in which the entire head block 3 swings about a horizontal axis in the longitudinal direction. When rocking occurs, the brake 11 is acted on the sheave 6 to apply frictional force to convert the kinetic energy into heat energy and diverge it, thereby suppressing the rocking. Therefore, the container guide 9a and the container 14 , And the efficiency of the cargo handling work of the container 14 can be improved.

The present invention is not limited to the above embodiment. For example, the brake may be provided on all sheaves on the head block or on some sheaves. Of course, various changes can be made without departing from the gist.

[0015]

As described above, according to the present invention,
The locking that occurs when the head blog is suspended by hanging it down is suppressed by applying a frictional force by applying a brake to the sheave to adjust the rotation, so that the container guide and the container are aligned. Therefore, it is possible to obtain an excellent effect such that the efficiency of the cargo handling work of the container can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a trolley and a head block of the present invention.

FIG. 2 is a side view of the locking device of the head block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crane boom 2 Trolley 3 Head block 4 Travel rail 5, 6 Sheave 7 Shaft 8 Bearing 9 Spreader 10 Locking suppression device 10a Disk 11 Brake 12 Rope 14 Container

Claims (3)

[Claims] 1. A locking device for a head block, which lifts and lowers a container by a spreader suspended via a head block on a trolley moving on a crane boom, wherein the sheave is disposed on the head block. An anti-locking device for a head block, comprising a brake for applying frictional force to adjust the rotation of a sheave. 2. The locking device for a head block according to claim 1, wherein the locking device comprises a disk provided on a sheave shaft, and a brake for bringing a frictional force into contact with the disk. 3. The head block locking suppression device according to claim 1, wherein said locking suppression device comprises a brake that applies frictional force across a side surface of the sheave.