JPS58125577A - Cable reel device of travelling body such as crane - Google Patents

Abstract

PURPOSE:To make it possible to absorb the torsion of a signal cable caused by its winding by connecting the signal cable which has been formed into a coil shape and to which a spring material has been longitudinally attached, to the signal core line of a composite cable. CONSTITUTION:The signal core line of a composite cable 4 is connected to a travelling body via a signal cable 8, and this cable 8 is formed by covering core lines 8a such as many optical fibers in a body, while a band shaped spring 8b is longitudinally attached to said cable. Further, said cable having its roll diameter d is formed into a coil shape elastically deformable in its radial direction, and wound around a fixed drum 9. In such a constitution, when the main reel 5 is, for example, turned in the winding direction, the number (n) of turns of the cable 8 increases in proportion to the rotation of the main reel 5, while the roll diameter (d) decreases, allowing the torsion of the cable 8 to be absorbed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a cable for transmitting driving power and other various control signals to a moving object such as a large crane, which is paid out or wound around as the moving object moves. The present invention relates to a reel device, and more specifically, to a cable reel equipment that is effective when using a metal cable having a power wire for power supply and a large number of signal wires for signal or control purposes. .

Conventionally, in this type of reel device, the reel rotates as the moving object moves, so the following steps are required to connect the beginning end of the cable wound around the reel to the fixed wiring section of the moving object. That's how it was done. That is, a brush connected to the cable and rotating integrally with the reel was made to slide on a slip ring connected to the fixed wiring, thereby making it possible to conduct electricity between the rotating part and the fixed part.

However, in the case of the above-mentioned connection using brushes and slip rings, the structure is made in Australia and is expensive, and at the same time, as the number of core wires increases due to the increase in control signals, the number of slip rings increases, resulting in an overall problem. It became large, and there was no hope of making it more compact. Further, in the control signal, noise that happens to occur on the horizontal axis between the brush and the slip ring may cause malfunction. For this reason, the use of optical signals to transmit control signals (including telephone, video signals, etc.) has been considered, and the rotary system developed by India has been put into practical use at This type is only available for single-core optical fibers, and one for multi-core optical fibers has not been developed. Therefore, when a large number of signals are required to be transmitted, it is necessary to multiplex them in a single source fiber, but this multi-signal system has the problem of being very expensive.

This invention was proposed in consideration of the above-mentioned circumstances, and it is possible to connect a moving object and a composite cable without using a slip ring 1e to prevent malfunction of the moving object, and to connect the moving object to a composite cable without using a slip ring. The purpose is to enable the introduction of optical fibers into the six signal and control pins of the composite cable.

The present invention will be described below based on embodiments shown in the drawings.

Figures 1 and 2 are the 11th part of this invention! This is an example, and the reference numeral 1 in the figure is a pedestal.
It is mounted on a moving body such as a crane (as shown) and moved as one, and a pair of support brackets 2A and 2B are provided on the top surface of the bracket 2A and 2B facing each other at a distance. Of these support brackets 2 people/2B,
A support shaft 3 is supported horizontally and rotatably on the support bracket 2A on the left side of FIG. A main reel 5 on which 4 is wound is attached. The main reel 5 is biased in the direction of winding the composite cable 4 by a torque motor (as shown).The main reel 5 is electrically connected to the movable body and has a support shaft 3. Slip rings 6, 6, 6 having a circumferential contact surface centered at The brushes 7, 7, and 7, which are rotated together with the brushes, are arranged so that they can be slid on each other.

On the other hand, the coded core wire of the composite cable 4 is connected to a moving body (as shown in the figure) via a signal cable 8, and this signal cable 8 includes a large number of optical fibers, etc. as shown in FIG. It is formed by integrally covering 8 m of core wires, and a band-shaped spring material 8b is attached longitudinally, and is further formed into a coil shape having a winding diameter d and being elastically deformable in the radial direction. Also, inside this signal cable 8, a fixed drum 9 having a smaller diameter (outer diameter D) than this signal cable 8 is provided.
is inserted through the fixed drum 9, and the support shaft 3
It is fixed to the support bracket 2B on the right side of FIG. 1 coaxially with and spaced apart from the support bracket 2B. Furthermore, the signal cable 8
is a support arm 10 housed on the side of the main reel 5.
This allows it to revolve around the fixed drum 9.

The operation of the cable reel device configured as above will be explained below. In the following explanation, when the composite cable 4 is pulled as the moving body moves,
When the main reel 5 is rotated clockwise when viewed from the arrow direction in FIG. 1 and the composite cable 4 becomes slack, the main reel 5
is rotated counterclockwise by a torque motor or the like, and the single-coupled cable 4 is wound up.

That is, when the main reel 5 rotates in the pick-up direction,
As the main reel 5 rotates, the number of turns n of the signal cable 8 increases and the winding diameter d decreases, and when the main reel 5 rotates in the feeding direction, the number of turns n of the signal cable 8 increases.
decreases, and the winding diameter d increases due to the force that causes damage to the spring material 8b.
increases to absorb the twist of the signal cable 8.

To explain in detail the function of the signal cable 8, the length L of the coiled portion of the signal cable 8 is equal to the number of turns ns! There is a dispute of L*nπd for the diameter d, and when the main reel 5 has completely wound the composite cable 4, the winding g
! In is maximum (Ilm-) and winding id is minimum (however, d
>D), and the main reel 5 rotates N times in order to unwind the entire composite cable 4, so that the signal cable 8
The number of turns is the minimum (am-N), and the number of turns 1d is the maximum. Figure 3 shows a second embodiment of the present invention.
In place of the band-shaped spring material 8b of the first embodiment, a linear spring material 8C of 1m81 length is attached vertically, and these are wrapped together to form eight signal cables.

In each of the above-mentioned embodiments, optical fibers are used for the signal core wire of the composite cable 4 and the signal cable 8, but the present invention can also be applied to a case where metal laminated wires are used for these. Further, in the above embodiment, the support shaft 3 is supported by one of the support brackets 2A, but the support shaft 3 is inserted through the fixed drum 9, and the support shaft 3 is supported by the support brackets 2A and 2A.
It may be supported by both B.

As is clear from the above description, the present invention is based on a method in which a spring material is vertically attached to the signal core wire of a composite cable wound around a main reel mounted on a moving body such as a crane, and the wire is formed into a coil shape. After the signal cable is connected, the number of turns of the coiled signal cable is increased or decreased by the rotation of the main reel as the composite cable is wound and unwound, and the diameter of the coil is increased or decreased as the number of turns changes. Cable torsion can be accommodated, making it possible to connect moving objects and composite cables without using slip rings.Furthermore, it is possible to connect composite cables that use many optical fibers for signals to mobile objects. It has the effect that it can be used for connection.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 show a first embodiment of this invention.
Figure 1 is an explanatory diagram of the overall configuration, Figure @2 is a sectional view of a signal cable formed into a coiled shape, and Figure 3 is a diagram of the present invention @2.
This shows an example and is a cross-sectional view of a signal cable formed into a coil shape. 01...Main frame, 2 people, 2B...Support bracket, 3...・Support shaft, 4...Sliding cable, 5...Main gear, 8.8 people...Signal cable, 8a-
1゜...6 women, 8b/8C...spring material, 9.
... Fixed drum, 10 ... Support arm. Applicant Fujikura Electric Wire Co., Ltd.

Claims (1)

[Claims] A frame that can be moved together with a moving object such as a crane (1
), a pair of support brackets z? (2A and 2B) are fixed facing each other with a space between them, and between these support brackets is a main cable for winding a composite cable (4) having a power core wire and a signal core wire. A reel (5) is rotatably provided, and a fixed drum (9) having the same axis as the main reel and spaced apart in the axial direction is fixed to one of the support brackets, and the signal core wire of the composite cable is attached to this fixed drum. A signal cable (8.8 people) having a core (8a) that connects the core wire and a moving body and a fused or band-shaped spring material (Bb, 8c) longitudinally attached to this core wire is elastically connected in the radial direction. A cable reel device for mobile objects such as cranes, which is characterized by being formed into a coil shape that is deformable and has a larger diameter than a fixed drum.