JPH0242034Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a power supply device for supplying electricity to a rotating part of a crane or the like, and particularly relates to a holding structure for a power supply cable.

[Background of the idea]

Generally, in equipment having a rotating part such as a crane or a catenarian loader, a swing power supply device is required to supply electricity from a fixed part that supports the rotating part to the rotating part. In other words, there is a drive source for driving the crane in the swinging part, and a drive source for driving the bucket cart in the catenary loader, and it is necessary to supply electricity to these drive sources from the fixed part. It is. Conventionally, a rotating power supply device used in these rotating parts is provided with a hanger 3 that moves on a rail by rollers 2, as shown in FIG. 1, for example.
There is a curtain type in which the power supply cable 4 is held in a spiral or wavy manner, and the power supply cable 4 is expanded and contracted in the free space between the hangers 3, and the power supply cable 4 is sent out and retracted. Some types of curtain type have rails that are linear or circular. Furthermore, as other conventional examples, although not shown, there are various types such as a power track type using a double feeding mechanism of a cable tensioned between drums. These conventional swing power supply devices allow smooth feeding and retraction of power cables,
This is to prevent the power supply cable from swinging greatly as the rotating section rotates, thereby preventing it from taking up a large space.

[Problems with background technology]

However, these conventional swing power supply devices are configured so that they can be used even when the swing angle is large, and the devices themselves are relatively complicated and expensive. Therefore, the swing angle is small, and the swing power supply device is not suitable for use in construction sites such as bridges, and is discarded after several months or a year or two. In order to supply power easily and inexpensively at such a construction site, it is conceivable to use the power supply cable 4 while it is placed directly. However, this makes it difficult for the power supply cable 4 to be smoothly sent out and retracted.

[Purpose of invention]

It is an object of the present invention to provide a small swing power supply device that is a simple and inexpensive device that can be discarded after several months or a year or two, and that can smoothly send out and pull in a power supply cable. With the goal.

[Summary of the idea]

The small swing power supply device of the present invention is one in which one end of a flexible tube containing a built-in power supply cable is connected to a fixed part, the other end is connected to a rotating part, and power is supplied from the lower fixed part to the upper rotating part, A four-sided roller is held by a chain stretched horizontally on the fixed part side with elasticity in the vertical direction, and the four-sided roller is caused to pass through the flexible tube.

As a result, the middle portion of the flexible tube is held with elasticity, and even if the flexible tube moves up and down as it turns, the flexible tube will not be damaged.

Further, the flexible tube is sufficiently suspended below the four-way roller, and the upper flexible tube of the four-way roller is always urged downward by the weight of the lower flexible tube.

As a result, when the flexible tube above the four-way roller becomes slack, it is automatically pulled under the four-way roller.

[Example of idea]

An embodiment of the present invention will be described with reference to FIGS. 2 and 3. In this embodiment, a cab tire cable 11 is used as the power supply cable, and a plurality of cab tire cables 11 are bundled together and protected with a steel wire net 12 to prevent damage, forming one flexible tube 13. has been done. One end of this flexible tube 13 is connected to a connection box 14 on the fixed part side, and the other end is connected to a connection box 15 on the rotating part side.

On the rotating part side, the flexible tube 13 passes through a through hole 17 provided in a rotating base 16 that forms a part of the rotating part. The flexible tube 13 passing through the through hole 17 is further inserted into the four-way roller 18.
pass through.

This four-sided roller is made up of four rollers arranged in a rectangular shape as shown in Figures 4 and 5, and the curved surface of each roller forms a circular hole in the center through which the flexible tube passes. be done. This four-way roller 18 is connected to a fixed base 19 on the fixed part side.
It is held elastically in the vertical direction by a chain 20 stretched horizontally. The flexible tube 13 that has passed the four-way roller 18 hangs down significantly below the four-way roller 18 and is in contact with the floor 21 . A cleat 22 is placed on the floor 21.
is provided to fix a part of the flexible tube 13 to the floor. The flexible tube 13 further extending from the cleat 22 is attached to the fixed base 19 on the fixed part side.
It is connected to a junction box 14 provided in the.

As shown in FIG. 3, the through hole 17 is provided at a position r apart from the rotation center 23 and rotated 25 degrees to the right with respect to the crane direction A. Originally, it is desirable to provide the through hole 17 at the rotation center 23, but since there are other members at the rotation center, it is necessary to shift it from the rotation center position.Also, considering the elasticity of the flexible tube 13 itself, the crane This is because it is necessary to deviate a little from direction A. The turning section of this embodiment turns 100 degrees left and right using this 25 degree line B as a base line.
When turning left and right, the flexible tube 13 is guided by the left V-shaped roller 24 or the right V-shaped roller 24' provided on the fixed base 19, so that excessive force is not applied to the flexible tube 13. I try not to get it.

As shown in FIGS. 6 and 7, this V-shaped roller has two rollers arranged in a V-shape, and the flexible tube moves between the V-shapes. During this left and right turning, when the turning angle increases, the flexible tube 13 is pulled by the turning section and sent out, and when the turning angle decreases, the flexible tube 13 hangs below the four-way roller 18. The flexible tube 13 is pulled in by its own weight.

The steel wire mesh 12 is pulled toward the rotating portion by a metal fitting 25 on the rotating portion side, so as to prevent it from being rolled up from the cab tire cable 11.

As described above, according to the small swing power supply device of this embodiment, the four-sided roller 18, through which the flexible tube 13 whose both ends are connected to the rotating part and the fixed part, passes, and the horizontally stretched roller that holds this four-sided roller Chain 20 is sufficient. Therefore, it is possible to provide a simple and inexpensive small swing power supply device.

[Effect of idea]

According to the small swing power supply device of the present invention, the number of members constituting the device can be reduced, the flexible tube can be retracted by its own weight, and a simple and inexpensive small swing power supply device can be provided. can.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional swing power supply device, FIG. 2 is a front view showing a small swing power supply device according to an embodiment of the present invention, FIG. 3 is a plan view of FIG. 2, and FIG. A plan view of the four-sided roller used in Fig. 2, Fig. 5 is a side view of Fig. 4, Fig. 6 is a front view of the V-shaped roller used in Fig. 2, and Fig. 7 is a side view of Fig. 6. It is a diagram. 1...Rail, 2...Roll, 3...Hanger,
4... Power supply cable, 11... Cab tire cable, 12... Steel wire net, 13... Flexible tube, 14, 15... Connection box, 16... Swivel base, 17... Through hole, 18... ...four-way roller, 19
...Fixed stand, 20...Chain, 21...Floor, 2
2... Cleat, 23... Turning center, 24,2
4'...V-shaped roller, 25...metal fittings.

Claims (1)

[Scope of Claim for Utility Model Registration] A power feeding device that supplies power from the lower fixed part to the upper rotating part by connecting one end of a flexible tube with a built-in power supply cable to a fixed part and the other end to a rotating part. Then, the four-sided rollers are held by a chain stretched horizontally on the fixed part side with elasticity in the vertical direction.
A small swing power supply device characterized in that the flexible tube is passed through the four-sided roller, and the flexible tube above the four-sided roller is always urged downward by the weight of the flexible tube hanging below the four-sided roller.