JP3305256B2 - Spreader cable winding device for 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 spreader cable winding device for a container crane and, more particularly, to preventing abnormal tension of a cable such as an electric wire when the spreader is wound up or down by a hoisting rope, and cutting the cable. The present invention relates to a spreader cable winding device for a container crane, which can prevent such accidents.

[0002]

2. Description of the Related Art With the spread of container ships, loading and unloading of large quantities of containers has been carried out in harbors. Various container cranes have been developed to streamline such loading and unloading.

[0003] A container crane is a trolley (moving body, moving vehicle) that travels in a horizontal direction on a fixed structure on the land and moves to a position above a hull, and a spreader (hanging up and down from the trolley). And a rope hoisting drum for raising and lowering the spreader with a rope, and a hydraulic device for holding the container on the spreader. And, in order to operate this electric motor for a hydraulic device on the spreader side,
A cable is interposed between the trolley and the spreader.

[0004] A spreader cable winding device for a container crane as described above will be described with reference to FIGS. 4 to 6. In the container crane, a main girder 52 is horizontally supported on a traveling leg 51, and an elevating girder 53 is connected to the main girder 52 on the sea side, and a tension link 54 is mounted between the main girder 52 and the elevating girder 53. Have been. A trajectory 55 is laid along the main girder 52 and the elevation girder 53.
The trolley 56 runs on the top 5. The trolley 56 has a cab 57.

The spreader 58 is suspended from a trolley 56 by a hoisting rope 59. In the machine room 60 behind the main girder 52, an undulating device 61 and a traversing device 62 are provided.
And a hoisting device 63.

When the driver is in the cab 57, the undulating device 61
Is driven to raise the tension link 54, or the traversing device 62 is driven to cause the trolley 56 to traverse on the trajectory 55. Further, the driver drives the hoisting device 63 to lift and lower the hoisting rope 59, while holding the container 64 in the hull 65 by the holding means 66 provided on the spreader 58 and discharges the container 64 to land. And conversely, loading from land to ship.

[0007]

For such an operation, a cable 67 is required together with a hoisting rope 59, as shown in FIG. The cable 67 is fixed at a point A with respect to the trolley 56 and at a point B with respect to the spreader 58, respectively, passes through a basket 68, and is stored therein. In such a storage system, when the spreader 58 is wound by using the hoisting rope 59, the cable 67
Is spirally dropped into the basket 68 by its own weight.

According to the structure shown in FIG. 5, when the spreader 58 and the cable 67 relatively swing during the winding operation, the slack portion 67a at the lower end of the cable 67 does not enter the basket 68. There was a droop to the outside.
When the part 67a of the cable 67 is not stored in the basket 68, the cable 67 may be damaged when the spreader 58 and the container 64 are attached and detached.

FIG. 6 shows another connection method (winding method) for connecting the cable 67. In this method, a cable 67 has a lower end fixed to a spreader 58 at a point B through a cable guide 69 and an upper end connected to a winding drum 70 provided on the trolley 56. When winding or lowering the spreader 58, the winding drum 70 is driven in synchronization with the hoisting / lowering speed of the hoisting rope 59 and the cable 6
7 is wound on a winding drum 70.

The driving device (not shown) for the winding drum 70 is provided separately from the driving device for the winding drum (not shown) for the hoisting rope 59. Here, the hoisting rope 59 may be elongated by a load, and as a result, the hoisting speed of the hoisting rope 59 may change. Therefore, it is very difficult to synchronize the winding / unwinding speed of the cable 67 with the hoisting / unwinding speed of the hoisting rope 59 at all times. There was a problem that there was.

When the spreader is driven up and down by a rope,
There is a demand for a container crane that can prevent a situation in which a cable is inadvertently strained due to inadvertent tension and the container falls.

The present invention has been made in view of the above circumstances, and achieves the following objects. An object of the present invention is to provide a spreader cable winding device for a container crane that can reliably prevent a cable connecting a trolley and a spreader from being cut when a container is hoisted or lowered by a hoisting rope. . Another object of the present invention is to provide a spreader cable winding method for a container crane, which can reliably and inexpensively prevent a cable connecting between a trolley and a spreader when a container is wound up and down by a hoisting rope. An object of the present invention is to provide a taking device. Still another object of the present invention is to provide a spreader cable winding device for a container crane capable of mechanically simplifying the means for achieving the above object and reliably preventing an accident from occurring. . Still other objects of the present invention will be more specifically and clearly described through the following embodiments.

[0013]

A spreader cable winding device for a container crane according to the present invention is provided with a cable provided between a moving body and a hanger and between the moving body and the hanger. A hoisting rope for suspending the hoist from the moving body, a cable winding drum for winding the cable, a hoisting hoist drum for winding the hoisting rope, and the cable winding drum And an interlocking driving means for driving the hoisting hoist drum in conjunction with the hoisting hoist drum, wherein the interlocking driving means synchronizes with the hoisting hoisting drum hoisting speed and the hoisting speed, and It has a speed tuning mechanism for controlling the winding speed and unwinding speed of the take-up drum.

The speed tuning mechanism is mechanically interposed between the cable winding drum and the hoisting hoist drum, and does not perform tuning by computer control or the like. That is, the tension between the rope and the cable is automatically tuned mechanically and self-controlled,
The cable tension does not unilaterally increase abnormally.

The spreader cable take-up device for a container crane according to the present invention is the spreader cable take-up device for a container crane according to claim 1, wherein the speed tuning mechanism comprises the hoisting hoist drum and the cable take-up drum. And a speed reduction mechanism provided between them.

[0016] The reduction mechanism includes a connection reduction gear connected to a reduction gear shaft of a hoisting hoist drum, a connection shaft connected to the connection reduction gear, a reduction gear of the connection shaft and the cable winding drum. It is more preferable to have a transmission band provided therebetween. A coupling mechanism including such a speed reducer further demonstrates that the speed tuning mechanism is mechanical.

The spreader cable winding device for a container crane according to the present invention is the spreader cable winding device for a container crane according to claim 1 or 2, wherein a tension acting on the cable is provided between the cable and the hanging member. And a resistance means for absorbing at least a part of the cable and resisting the winding operation of the cable.

It is preferable that the resistance means is provided at an intermediate position of the cable. The provision of the resistance means enables mechanical control for the speed tuning. Such resistance means include springs, in particular,
A mainspring spring is preferred. The resistance by such resistance means is based on the action / reaction, and simultaneously reduces the instantaneous abnormal tension of the cable.

[0019]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view showing a main part of a spreader cable winding device for a container crane according to the present embodiment. FIG. 2 is a perspective view of the same.

As shown in FIGS. 1 and 2, in the present embodiment, the cable winding drum 5 for the spreader cable 4 and the hoisting drum 3 for the hoisting rope 2 are mechanically connected. Thus, the winding speeds of the two drums 5 and 3 are synchronized.

That is, both the hoisting drum 3 and the cable winding drum 5 are driven by the winding motor 6. The hoisting motor 6 is provided with a hoisting speed reducer 7. The hoisting reducer 7 is connected to the hoisting hoisting drum 3. The hoisting speed reducer 7 is connected to the cable winding drum 5 via a connecting speed reducer 11, a connecting shaft 12, and a winding speed reducer 9.

The hoisting drum 3, the hoisting speed reducer 7, and the hoisting motor 6 are provided on the left and right, one set each. The left and right hoisting speed reducers 7 are connected to each other via a connecting speed reducer 11 and a connecting shaft 12. Pull-ups 13 and 14 are provided on the winding speed reducer 9 and the connecting shaft 12 of the cable winding drum 5 respectively. When the transmission belt 15 is circulated around these pulleys 13 and 14, the take-up reduction gear 9 and the connection shaft 12 are connected.

In FIG. 1, reference numeral 1 denotes a trolley body 1
(Moving body). The trolley main body 1 corresponds to the main body of the trolley 56 described above. That is, the trolley body 1 is provided so as to run on a crane.

On the trolley body 1, a hoisting drum 3 and a cable winding drum 5 are rotatably supported. The hoisting hoist drum 3 is for winding the hoisting rope 2 for suspending a spreader (a hoisting tool, not shown in FIG. 1; see reference numeral 10 in FIG. 3). The cable winding drum 5 is for winding the spreader cable 4. The lower end or the lower part of the cable 4 is fixed to an appropriate position of the spreader, not shown.

The hoisting drum 3 and the cable winding drum 5 are mechanically connected and driven by a set of driving devices. Further, interlocking drive means for synchronizing the winding speeds of the two drums 3 and 5 is interposed between the two sets of the lifting tool winding drum 3 and the cable winding drum 5.

The interlocking drive means includes a hoist motor 6,
A hoisting reducer 7 for the hoisting hoisting drum 3, a connecting mechanism 8 for connecting the hoisting reducers 7, a winding reducer 9 for the cable winding drum 5, a connecting mechanism 8, and a winding reducer. And a power transmission belt 15 for connecting the power transmission belt 9 with the power transmission belt 9. The connection mechanism 8 includes a connection reduction gear 11 and a connection shaft 1.
2 is provided. The hoisting hoisting drum 3 that makes a pair on the left and right is coaxially arranged.

The connecting speed reducer 11 is connected to the hoisting speed reducer 7 and the connecting shaft 12. The hoisting speed reducer 7 is connected to the hoisting hoist drum 3. Reduction gear 1 for connection
1 are connected by a connection shaft 12. The connection reduction gear 11 is a mechanical transmission means such as a gear, a transmission band, and the like.
It has a deceleration function by a combination of screws, bevel gears and the like.

A first pulley 13 is fixed to the input shaft of the winding speed reducer 9 coaxially with the input shaft. On the connecting shaft 12,
A second pulley 14 is fixedly provided coaxially with the second pulley 14. The first pulley 13 and the second pulley 14 are connected by a transmission belt 15 stretched therebetween.

As described above, the connecting means for connecting the hoisting drum 3 and the cable winding drum 5 includes the speed reducer. Such a speed reducer does not need to be provided in both the hoisting drum 3 and the cable winding drum 5, and mechanically connects the hoisting drum 3 and the cable winding drum 5. What is necessary is just to interpose as one reduction gear or one reduction gear unit having one reduction gear function in the connecting means.

In order to synchronize the winding speeds of the hoisting drum 3 and the cable winding drum 5, the two drums 3, 5 are used.
The speed reduction ratio i of the speed reducer provided therebetween can be expressed by the following equation. i = D / d / n D: diameter of hoisting drum 3 for hoisting tool, d: diameter of winding drum 5 for cable n: number of ropes per corner of spreader

As shown in FIG. 3, the hoisting drum 3
Is wound around a sheave 19 (corresponding to a moving pulley indicated by reference numeral 19 in FIG. 6) provided on the spreader 10 (if the number of windings is 1, n =
2). The cable 4 discharged from the cable winding drum 5 is fixed to an appropriate position point B of the spreader 10 (corresponding to the position point B in FIG. 6).

FIG. 3 shows a connection structure between the cable 4 and the spreader 10. A connecting wire 17 is stretched between a middle position C of the lower part of the cable 4 and a moving point D slightly away from the fixing position point B on the spreader 10. The position point C is a fixed point on the cable 4, but the moving point D is not a fixed point on the spreader 10. Point C of connection wire 17
The other end is fixed to an appropriate position of a mainspring spring 18 fixed on the spreader 10. The mainspring 18 absorbs the difference between the respective hoisting speeds that can occur between the hoisting rope 2 and the cable 4 and relieves the abnormal tension that is suddenly applied to the cable 4 due to an abnormal load. The cable 4 is prevented from being cut.

Next, the operation and effect of this embodiment will be described. When the left and right hoist motors 6 are driven, the left and right hoisting drums 3 are driven in synchronism, and the left and right hoisting ropes 2 are wound up or down at a predetermined speed, and are suspended via the spreader 10. The container (not shown) is moved up and down.

On the other hand, the rotation of the hoist motor 6 for operating the hoisting drum 3 for the lifting gear is simultaneously performed by the left and right hoisting reducers 7 via the right and left connecting speed reducers 11 and the connecting shaft 12.
After being transmitted to the cable take-up speed reducer 9 via the transmission belt 15, it is mechanically transmitted to the cable take-up drum 5. That is, the cable winding drum 5 is driven by the left and right winding motors 6 via the above-described speed reducer. Therefore, the cable 4 is wound on the cable winding drum 5 at the same speed as the hoisting rope 2 in synchronization with the hoisting rope 2, that is, in a state where both tensions are made uniform by the principle of action and reaction, or Will be unwound. Therefore, no abnormal load is applied to the cable 4.

As shown in FIG. 3, due to a change in elongation of the hoisting rope 2 caused by a change in the weight of the container or other causes, the hoisting / lowering speed V1 of the hoisting rope 2 is changed.
When the difference between the speed of winding and unwinding the cable 4 and the speed V2 of winding and unwinding of the cable 4 occurs, the operation of raising or lowering the cable 4 causes the winding and unwinding speed of the hoisting rope 2 to be increased by the action of the mainspring 18. Follow. Following this, the cable 4
Is further avoided.

[0036]

According to the spreader cable take-up device for a container crane according to the present invention, the spreader is driven by one set of drive devices by mechanically connecting the take-up drum for the cable and the take-up drum for the lifting implement. Since the winding speeds of the two drums are synchronized, the cable is smoothly wound or unwound at a constant speed in synchronization with the hoisting rope. If a tension absorbing means is interposed between the lower part of the cable and the spreader, even if there is a difference in the hoisting speed between the cable and the hoisting rope, the speed difference will be absorbed and the cable will be damaged. Trouble is further avoided. Such an effect makes it possible to efficiently and efficiently carry out container handling with a relatively simple device configuration.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a spreader cable winding device for a container crane according to the present invention.

FIG. 2 is a perspective view showing a main part of FIG. 1;

FIG. 3 is a front view showing a resistance unit constituting the one embodiment.

FIG. 4 is a front view showing a conventional general container crane.

FIG. 5 is a front view showing a conventional spreader cable winding device of a general container crane.

FIG. 6 is a front view showing a spreader cable winding device of a conventional general container crane.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Trolley main body (moving body) 2 ... Hoisting rope 3 ... Hoisting drum for hoisting device 4 ... Cable and spreader cable 5 ... Winding drum for cable 6 ... Hoisting motor 7 ... Hoisting reduction gear 8 ... Coupling mechanism 9 ... Winding reduction Machine 10 ... Spreader (hanging tool) 11 ... Connection speed reducer 12 ... Connection shaft 13 ... First pulley 14 ... Second pulley 15 ... Drive band 17 ... Connection wire 18 ... Spring spring (resistance means)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-136783 (JP, A) JP-A-60-86033 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B66C 13/12 B66C 13/32

Claims (3)

(57) [Claims] 1. A cable provided between a moving body and a hanger
And provided between the moving body and the hanging tool,
A hoisting rope for suspending the hanger from the cable, and a cable winding drum for winding the cable
And a hoisting hoist drum for winding the hoisting rope
A winding drum for the cable;
Interlocking drive means for driving the
The interlocking drive means is provided for controlling a hoisting speed of the hoisting hoist drum.
Of the cable winding drum in synchronization with the
Equipped with a speed tuning mechanism to control winding speed and unwinding speed,  The hanging toolEstablished inActs on the cableAbnormal
To relieve tensionThe winding operation of the cable is
Container crane further comprising resistance means for resistance
Preda cable winding device. 2. The container crane according to claim 1,
In the winding device for a redder cable, the resistance means may be a container cable formed by a spring.
Lane spreader cable winding device. 3. The container crane according to claim 1,
In the winding apparatus for a redder cable, the resistance means is a coil spring constituted by a spring.
Spreader cable winding device for antenna crane.