JPH032792B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a mobile energy transmission line wound on a reel for transmitting electric power, communication, or any other energy, and a mobile energy transmission line formed between an energy supply source or its supplied part. The present invention relates to providing an energy transmission device that can be advantageously used in a relative rotation part. Cable reels are used to supply power to mobile machines such as stackers and reclaimers, and to send and receive control signals. This is because it does not meet the installation conditions for contact power supply lines such as trolley wires, and it is not possible to achieve satisfactory current collection when transporting materials that generate a large amount of dust, such as coal. A cable reel winds an energy transmission line, such as a cab tire cable, around its reel body, and as the transmission line is pulled out from the reel and moved, energy is transmitted to a mobile machine. In this case, the problem is that the energy transmission line and the energy supply source or its supply part must be connected while allowing rotation of the reel. In other words, when the reel is mounted on a moving machine, the lead-out end of the energy transmission line must be led to the energy supply source, and the winding side of the energy transmission line must be guided to the energy supply section of the mobile machine while allowing the reel to rotate. First, when the reel is installed on the energy supply source side, the lead-out end of the energy transmission line must be connected to the mobile machine, and the winding end must be connected to the energy supply source while allowing rotation of the reel. Conventionally, a slip ring device has generally been used to transfer energy in a relative rotation section constructed between such a reel and an energy supply source or a device on the side of the supply section. However, since this device achieves energy transmission while allowing the rotation of the reel through mutual rotational contact between the slip ring and the brush, the sliding of the brush causes progress of wear and noise, and especially When remotely controlling a mobile machine by transmitting control signals, there was a risk of malfunction. In view of the problem of the rotating contact method using such a slip-spring device, a device that transmits energy without any rotating contact part is prepared by providing a shaft and a case that is rotatable relative to the shaft, and transmitting energy between the shaft and the case. It is known that a transmission lead wire is wound in a spiral shape, and the spiral shape of the lead wire allows relative rotation. In this case, the spiral shape of the lead wire must be maintained constant so that the lead wire does not buckle due to the relative rotation of the shaft and the case. Conventionally, in this regard, both ends of the lead wire were fixed to the shaft and the case, respectively, and an elastic member was attached to the lead wire to give the lead wire an elastic force to expand the diameter outward to maintain a constant spiral shape. It is held in However, the biggest problem with that method is that the lead wires are fixed to both the shaft and the case.
Irregular bending and tension are applied to the lead wire as the shaft and case rotate relative to each other, and tension is also generated when the lead wire is subjected to an elastic force that causes the lead wire to expand in diameter. Such bending and tension shorten the service life of the lead wires, which poses an obstacle to stable energy transmission over a long period of time. In view of the problems of the prior art described above, the present invention has been developed to provide a long-term rotational connection without applying irregular bending or tension to the energy transmission lead wire wound in a spiral shape with elasticity between the shaft and the case. The purpose of the present invention is to provide a non-rotating contact type energy transfer device that can maintain stable performance over a long period of time. That is, as is clear from the accompanying drawings, the device of the present invention has shafts 8, 80 and cases 9, 90 that are rotatable relative to the shafts 8, 80. A pair of inner and outer elastic members 51, 52 are housed in a spiral manner around a shaft 80, and the inner and outer elastic members 51, 5
The outer elastic member 52 has an energy transmission lead wire 16 sandwiched between the two and wound in a spiral.
The inner end is fixed to the shafts 8, 80, and the outer end is fixed to the cases 9, 90 to connect the shafts 8, 80 and the cases 9, 90, and one inner elastic member 51 is fixed to the outer end. Only the inner end, together with the inner end of the outer elastic member 52, is fixed to the shafts 8, 80 without fixing the ends, whereby the energy transmission lead wire 16
The energy transmission lead wire 16 is provided so that it can be pressed from the inside against the outer elastic member 52 at all times, and the energy transmission lead wire 16 is connected to the inner and outer elastic members 51, 5.
The inner and outer elastic members 51 and 5
It extends further from the outer end of the case 9, 90 and is inserted into and out of a wire passage hole 91 provided in the cases 9, 90, and has an extra length 16' on the outside of the case 9, 90. A detailed explanation will be given below with reference to the drawings of the embodiments. In FIG. 1, 1 indicates the reel body, and 2 indicates the energy transmission line. In this embodiment, the energy transmission line 2 is an example in which a communication-power composite cabtire cable is used.
Further, the reel 1 is mounted on a moving body 3. Therefore, the drawn end of the transmission line 2 from the reel 1 is guided to the energy supply source side, and the power line 2A is connected to the power supply section 4, and the communication line 2B is connected to the transmission section 5. The reel 1 is rotatably supported by being integrally connected to the right end 8A of a tubular shaft 8 which is rotatably supported by a stand 6 installed on the movable body 3 via a roller bearing. The periphery of the left end 8B of the shaft 8 is covered with a case 9 installed on the stand 6, and a rotary joint is installed in the case 9. In this embodiment, power is connected to the slip ring device 10 and communication is connected by a transmission device 11 embodied in accordance with the present invention. That is, the case 9 has a partition 9A in the center to form a right chamber 9A and a left chamber 9B. Then, in the right ventricle 9A, a slip ring 12 is installed on the shaft 8B, while the slip ring 12 is attached to the shaft 8B.
The brush 13 that comes into sliding contact with is attached and supported by a support rod 14 attached to the inner wall of the case 9, and the slip ring 12 and the power line 2A of the transmission line 2 are connected, and the brush 13 and the power supply part 15 are connected and rotated. Achieving contact and connection. On the other hand, inside the left ventricle 9B, an energy transmission lead wire 16 is spirally wound between the shaft 8B and the case 9, and the inner wound end of the lead wire 16 is connected to the communication line 2B of the transmission line 2. The outer wound end of the lead wire 16 is connected to the receiving section 17 of the moving body 3, and the lead wire 16 is configured to transmit and receive communications while allowing the reel 2 to rotate in a spiral manner. In the above embodiment, the lead wire 16 and the slip ring device 10 are housed in a common case 9, but a case dedicated to each of the slip ring device lead wires 16 can be prepared separately, and the shaft 8 also supports the reel shaft. The side 8A and the rotary joint side shaft 8B can be independent. This way case 9
It is also possible to form a so-called unit by connecting the one shaft 8B to the reel 1 and fixing it on a stand to allow relative rotation or vice versa. Furthermore, the shafts of the slip-spring device 10 and the lead wire 16 may be made independent by using cases individually, and these may be connected to form a series of rotary joints. 2 to 4 show specific examples of the energy transfer device of the present invention. The device 11 has a tubular shaft 8
0 and a case 90, both of which are connected to each other by a ball bearing 70 and are configured to be relatively rotatable. A wire passage hole 91 is formed in the case 90 to draw the lead wire to the outside, and a lead-in hole 81 is formed in the shaft 80 to draw the lead wire inside and take it out from the shaft. In the space between the case 90 and the shaft 80, a pair of band-shaped elastic members 5 are provided.
1 and 52 and an energy transmission lead wire 16 are housed in a spiral manner, with the lead wire 16 being sandwiched between the elastic members 51 and 52. Inner ends of elastic members 51 and 52 and lead wire 1
6 is collectively fixed to the shaft 80 with a fixture 53,
The inner end of the lead wire 16 is further drawn into the shaft from the fixed portion through the lead-in hole 81 and guided to the transmission line wound on a reel or to the movable body. The lead wire 16 is wound into a spiral inside the case from the fixed part of the shaft 80, and then is drawn out to the outside with its outer end freely going in and out through the wire passage hole 91 of the case, and the extra length 16' is drawn out to the drawing side. After removing the stopper 54
The cable is fixed to the transmission line and guided to the moving body or the transmission line to be wound onto a reel. The innermost elastic member 51 is wound spirally from the fixing part of the shaft 80, and then its tip protrudes from the wire passage hole 91 of the case 90 and is slightly bent to connect the lead wire 1.
A guide portion 51a is formed to help the wire passing through the wire, and this guide portion 51a is set as a free end. This elastic member 5
1, the lead wire 16 receives an elastic force so as to constantly expand in diameter. On the other hand, the elastic member 52 wound outward is fixed to the shaft 80 and its outer end is fixed to the inner wall near the wire passage hole 91 of the case with a fixture 55, thereby connecting the case 90 and the shaft 80. The inner surface of the lead wire 16, which is elastically expanded in diameter, is received in contact with the lead wire 16. The functions of the device configured as described above are as follows when the shaft 80 is connected to the reel and one case 90 is fixed to the movable body. In this case, the stopper 54 is fixed to the moving body. First, when the shaft 80 rotates in one direction as the reel rotates and the lead wire 16 is wound in such a way that the diameter thereof is reduced, the elastic members 51 and 52 are also wound together, and the force of elastic expansion of the lead wire 16 is reduced. Elastic member 52
The diameter is reduced while constantly receiving it. In addition, the lead wire 16 is slightly dragged in the winding direction, but due to the dragging, the extra length 1
6' slides into the case through the wire passage hole 91 and attempts to absorb the amount of drag.
On the other hand, when the lead wire 16 is unwound to expand its diameter due to rotation of the shaft 80 in the opposite direction, the elastic members 51 and 52 are similarly unwound, but both ends are fixed. The elastic member 51 with its outer end free expands in diameter faster and tries to return to its original state than the elastic member 52 with the lead wire 1
6 is unwound while constantly absorbing the elastic diameter expansion force with the elastic member 52. In this case, the lead wire 16 pushes back the dragged portion to the extra length portion 16'. In this way, the spiral shape of the lead wire is contracted or expanded by the relative rotation of the shaft and the case, but at this time, when the elastic diameter expansion force of the lead wire is suppressed from its outer periphery, the elastic member receives it and expands. Undue bending or tension on the lead wire due to radial force does not occur at all. Furthermore, even if the lead wire is wound to reduce its diameter, the extra length provided on the outside absorbs the pulling force generated at that time by entering through the wire passage hole of the case, so no tension is generated on the lead wire at this time. Become.
Elastic members 51, 5 used in the above embodiments
2 is a metal plate spring. In addition, the lead wires 16 and 16' shown in the figure are made up of multiple signal transmission lines 16a, such as conductors or optical fibers, arranged in parallel and integrated by sandwiching insulation protection films 16b from above and below. Line 1 on the surface of the airum layer
If the elastic member 5 is left raised at the position 6a, the elastic member 5
The contact surface with 1 and 52 is reduced, the sliding property is improved, and the wire can be smoothly moved in and out through the wire passage hole. Of course, in addition to this, the contact surface between the elastic members 51 and 52 can be made smaller by adding new linear projections along the longitudinal direction to the exterior surface or forming dot-shaped projections. The lead wire 16 can also be provided between the elastic members 51 and 52 by arranging a plurality of single-core wires in parallel. In this case, it is preferable that the elastic members 51 and 52 swell outward as shown in the figure to ensure that each wire is pressed into the elastic members. As explained above, according to the energy transmission device of the present invention, an elastic member is spirally wound between the shaft and the case, which rotate relative to each other, and the elastic member is connected so as to share tension therewith. The elastic member is used as an outer member, and an inner elastic member that is fixed only to the shaft and wound spirally so that a pressing force is constantly applied to the inner surface of the elastic member is disposed inside the outer member, and An energy transmission lead wire fixed to the shaft is sandwiched between the elastic members of the casing in a spiral shape, and the part extending from the spiral part is freely passed in and out of the wire passage hole of the case. Because it is fixed outside via the extra length, the lead wire can be spirally arranged without tension, and in particular, due to the relative rotation between the shaft and the case, the spiral portion can be wound around the shaft. No tension is applied even when the diameter is contracted or expanded by unwinding, and since the spiral portion of the lead wire is always in contact with the elastic member from the inside and outside, movement is restrained, so irregular local areas can be prevented. To provide a non-contact rotary joint that does not cause bending deformation, fully achieves the intended purpose, and significantly reduces fatigue that increases over time for energy transmission lead wires. .

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the application situation of the device of the present invention;
FIG. 2 is an explanatory cross-sectional view showing one embodiment of the device of the present invention, FIG. 3 is an explanatory cross-sectional view taken along the line A-A' in FIG.
FIG. 4 is an explanatory cross-sectional view taken along line B-B' in FIG. 2. 1: Reel body, 2: Energy transmission line, 3:
Moving body, 8, 8A, 8B, 80: Axis, 9, 90:
Case, 91: Wiring hole, 16: Energy transmission lead wire, 16': Extra length, 51, 52: Elastic member.

Claims (1)

[Claims] 1. It has shafts 8, 80 and cases 9, 90 that are rotatable relative to the shafts 8, 80, and a pair of inner and outer parts are housed in the cases 9, 90 in a spiral manner around the shaft 80. elastic members 51, 52
and an energy transmission lead wire 16 sandwiched between the inner and outer elastic members 51, 52 and wound spirally, the outer elastic member 52 fixing the inner end to the shafts 8, 80 and the outer end. Case 9,9
0 to connect the shafts 8, 80 and cases 9, 90, one inner elastic member 51 does not have its outer end fixed, and only the inner end connects to the outer elastic member 52.
The energy transmission lead wire 16 is fixed to the shafts 8, 80 together with the inner end thereof, so that the energy transmission lead wire 16 can be pressed from the inside and constantly pressed against the outer elastic member 52. It is sandwiched between the inner ends of the inner and outer elastic members 51 and 52 to be fixed to the shafts 8 and 80, and is further extended from the outer ends of the inner and outer elastic members 51 and 52 and provided in the cases 9 and 90. The case 9,
90. An energy transmission device used in a relative rotation part, characterized by having an extra length part 16' on the outside of the shaft.