JPS6213277B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a cable crane, and particularly to a drive system for a hoisting rope hanger thereof.

[Background of the invention]

In the cable crane disclosed in Japanese Patent Application Laid-Open No. 55-101590, the hoisting rope has a small tension when no load is applied, and the rope causes a large deflection due to its own weight, so the hoisting rope is suspended midway by a hanger carrier.

FIG. 1 is a schematic side view of a general cable crane, in which a main rope 3 is stretched between a main tower 1 and a auxiliary tower 2, and a hook 5 is suspended from a trolley 4 that runs across the main rope 3. The hoisting rope 13 passes from the hoisting device 7 in the machine room 6 to the guide sheep 9 of the main tower 1,
It reaches the auxiliary tower 2 from the hoisting sheave 8 of the trolley 4, passing through the hook 5 and passing through the hoisting sheave 8'. In order to prevent deflection of the hoisting lobe 13 between the guide sheave 9 and the hoisting sheave 8 of the trolley 4 and between the hoisting sheave 8' and the lobe end 10 of the auxiliary tower 2, hanger carriers 11, 11' and 12, 12' is provided.
This hanger carrier 11, 11', 12, 1
2' runs on the main rope 3, and has a drive mechanism that arranges the trolley 4 and the main and auxiliary towers 1 and 2 at equal intervals.

Figure 2 is a cable crane rope layout diagram showing the conventional hanger carrier drive system.
This is an example in which the number of hanger carriers is two pairs.

15 is a transverse rope, one end of which is fixed to the rope end 14' of the trolley 4, passes through the guide sheave 17 provided in the auxiliary tower 2, passes through the drive sheave 18' at the top of the auxiliary tower 2, and extends to the main tower 1 side. It passes through the drive sheave 18 at the top of the tower 1 and reaches the traverse device 26. From the traversing device drum, it passes again through the guide sheave 16 provided in the main tower 1 and reaches the rope end 14 of the trolley 4. In this way, the transverse rope 15
are arranged endlessly, so the traverse device 2
When the trolley 6 is driven, the trolley 4 traverses on the main rope 3.

Carrier sheaves 19, 19', 20, 20' are fixed on the shafts of the drive sheaves 18, 18', and rotate at the same time as the drive sheaves 18, 18'. The diameter of the carrier sheaves 19, 19', 20, 20' is 2/3, 20, 2/2 of the diameter of the drive sheaves 18, 18'.
0' is 1/3. Therefore, the carrier ropes 21, 22 stretched between the respective carrier sheaves 19, 19', 20, 20'
It moves by 2/3 or 1/3 of the amount of movement of 5. The carrier rope 21, which moves 2/3 with respect to the transverse rope 15, is fixed to the hanger carriers 12, 12' at points a, a', and the carrier rope 22, which moves 1/3, is fixed to the hanger carriers 11, 11' at points b,
It is fixed at point b′. Therefore, when the trolley 4 traverses, the hanger carriers 12, 12' move by 2/3 of the traverse amount of the trolley 4, and the hanger carriers 11, 11' move by 1/3. As a result, the space between the trolley 4 and each of the towers 1 and 2 is always divided into three equal parts.

In this conventional hanger carrier drive system, the carrier ropes 21 and 22 are endlessly connected between the main and sub towers, so a force twice as much as the carrier rope tension acts between the towers, and a large amount of wind load is also received. The disadvantage was that it increased the strength of the tower and also increased the foundation load.

[Purpose of the invention]

An object of the present invention is to reduce the load acting on the main and sub-towers.

[Summary of the invention]

The present invention provides winding drums for carrier ropes in each of the main and sub-towers, and the rope is paid out from one of the drums by the movement of the hanger carrier.
By winding it around the other drum, there is no need to fold back the carrier rope.

[Embodiment of the Invention] The present invention will be described below with reference to an embodiment shown in FIG.

Drive sheave 2 driven by a transverse rope 15
3 and 23' are provided on each main and sub-tower, and rope drums 24, 24', 25 and 25' are fixed coaxially. The diameter of the rope drums 24, 24' is the same as the drive sheave 2.
3, 23' 2/3, and rope drum 25,
The diameter of 25' is 1/3. Main tower side rope drum 2
The carrier rope 21 let out from the rope drum 25 is wound around the rope drum 24' on the auxiliary tower side, and the carrier rope 22 let out from the rope drum 25 in the same way.
is wound onto the rope drum 25'. Hanger carriers 12 and 12' are fixed to the carrier rope 21 at points a and a', and the carrier rope 22
Hanger carriers 11, 11' are fixed at points b, b'.

With this configuration, the hanger carriers 12, 12' move by 2/3 of the amount of movement of the transverse rope 15, that is, the amount of movement of the trolley 4, and the hanger carriers 11, 11' move by 1/3 of the amount of movement of the trolley 4. . Therefore, the hanger carriers 11, 11', 12, 1
2' can always accurately divide the distance between the trolley 4 and each column into three equal parts. In this case, carrier rope 2
1 and 22 are not endless like in the past, and no large loads are applied to the main and sub-towers.

〔Effect of the invention〕

In the present invention, since the carrier ropes are not connected endlessly as in the past, there is no carrier rope to fold back, and the load acting on each main and sub-tower due to the tension of the carrier ropes is reduced to half of the conventional one, thus reducing the weight of each tower. , it is also possible to reduce the foundation load.

[Brief explanation of the drawing]

Figure 1 is a schematic side view of a cable crane, Figure 2 is a rope layout diagram of a conventional cable crane,
FIG. 3 is a rope layout diagram of a cable crane showing an embodiment of the present invention. 3... Main rope, 4... Trolley, 7... Hoisting device, 8, 8'... Hoisting sheave, 11, 11', 1
2, 12'... Hanger carrier, 13... Hoisting rope, 15... Traverse rope, 21, 22... Carrier rope, 23, 23'... Drive sheave, 24, 24', 25, 25'... rope drum.

Claims (1)

[Claims] 1. A trolley is freely suspended from the main cable placed between the main tower and the auxiliary tower of the cable crane, and the trolley is connected between the main tower and the auxiliary tower via the drum of the traverse device installed on one side of the main tower and the auxiliary tower. A part of the traversing rope that is hung endlessly between the two is fixed to the trolley, and the hoisting rope that is fed out from the drum of the hoisting device provided on one of the main tower and the sub-tower is suspended from the trolley. A hanger carrier fixed to the other tower via a device and supporting the hoisting rope is freely suspended from the main rope, and a drive sheave supporting the transverse rope in each of the main tower and the auxiliary tower. A plurality of rope drums with different diameters that rotate simultaneously are provided in pairs on each tower, a carrier rope is passed between the pair of rope drums, and in the pair of rope drums, the rope drum of one tower is connected to the carrier rope. 1. A cable crane characterized in that a rope drum of the other tower is provided so that the carrier rope is fed out when the cable is wound up, and a hanger carrier is fixed to the carrier rope.