JPS6296262A - Cable winding device - Google Patents

Abstract

PURPOSE:To avoid twist of a cable caused by rotation of a winding drum and to permit use of multi-conductor optical fiber cable, by providing means for preventing twist of a cable drawn out from a fixed drum in accordance with a normal and reverse rotation of a rotary drum. CONSTITUTION:Movement of a moving unit enables a winding drum 16 to wind and unwind a cable 15 corresponding the movement and then cable twist preventing means 29 functions. When a winding drum 16 unwinds the cable 15, a rotary drum 26 rotates by the same angle for unwinding the cable 15 so thattension of the cable 15 between fixed drums is loosened. Then, a support arm 34 of a guide pulley 35 is rotated by action of a spiral spring and the cable 15 is wound to a fixed drum by the rotated angle by the guide pulley 35. When the winding drum 16 winds the cable 15, twist of the cable 15 is prevented by reverse operation. Therefore, it is possible to fasten a fixed side and a moving unit by a single cable, whereby a multi-conductor optical fiber can be also used.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cable winding device, and in particular, it is installed in a mobile device such as a mobile crane, and is used to supply power from a fixed side on the ground or to a cable for communication. This invention relates to a cable winding device that winds up or unwinds the cable as the moving device moves.

[Prior Art] Generally, a cable winding device 5A has a structure as shown in FIG. 7.

As shown in the figure, a power cable 1 extending from a stationary side on the ground to a moving device is wound around a winding drum 2. The cable 1 has a length that allows the moving device to move freely. Rotating shaft 3 of winding drum 2
is fixed to the moving device by bearings 4.5. A constant torque is applied to the winding drum 2 so that the power cable 1 wound thereon is unwinded when the movable device moves away from the fixed side, and is wound up when the movable device approaches the fixed side. In order to apply a constant torque to the winding drum 2, a torque motor 6 installed parallel to the rotating shaft 3 of the winding drum 2 is attached via a reducer 7 (a gear 8 and a rotating shaft 3
The winding drum 2 is connected to a gear 9 attached to the winding drum 2 by a chain 10. Note that 11 is a magnetic brake. Three slip rings 12 are fixed to the rotating shaft 3 in order to transmit electric power from the rotating side to the stationary side of the moving device main body. The power cable 1 wound around the winding drum 2 has three copper wires installed inside it, and these copper wires run from the center of the drum 2 through the rotating shaft 3 to the three slip rings 12 mentioned above. each connected. Brushes 13 are provided on both sides of the slip ring 12 so as to sandwich it therebetween. A cable (not shown) connected to this brush 13 is extended to a predetermined position on the main body of the moving device.

[Problems to be Solved by the Invention] In the conventional cable winding device, power was supplied from the rotating side to the stationary side of the moving device body using the slip ring 12 and the brush 13.
If used inside, slip ring 12 and brush 1
It is impossible to convey by 3.

If the cable 1 is directly connected from the winding drum 2 to the fixed side of the moving device main body via the rotating shaft 3, the cable 1 will be twisted and damaged.

It is also possible to use a connector to untwist the optical fiber, but in this case there is a limit to the number of fibers.

[Object of the Invention] The present invention was devised to effectively solve the problems in conventional cable winding devices. An object of the present invention is to provide a cable winding device capable of eliminating twisting caused by rotation of a winding drum.

[Summary of the Invention] In order to achieve the above object, the present invention winds and unwinds the middle of a power or communication cable connected between a stationary side and a moving device on a winding drum provided on the moving device. In the cable winding device, the cable winding device allows the moving device to travel freely, and the cable winding device is located between the winding drum and the cable fixing side of the moving device, and is provided on the rotating shaft of the winding drum. a rotating drum for winding up the passing cable; a fixed drum fixed to the cable fixing side of the moving device opposite to the rotating drum for winding up the cable; and a fixed drum for winding the cable. It is equipped with a cable twist prevention means for preventing twisting of the cable fed out to the rotating drum according to the forward and reverse rotation of the drum, and eliminates twisting that occurs when the rotating side and the stationary side are directly connected with the cable. It was designed to do so.

[Example] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view showing the cable winding device of the present invention, and FIG.
3 is a side sectional view of FIG. 2, and FIG. 4 is a sectional view taken along the line TV-rV of FIG. 3.

As shown in the figure, a winding drum 16 is provided on the mobile device side for winding up the middle of a cable 15 that extends from a fixed side on the ground to a predetermined position in the mobile device for communication, power supply, etc. .

This winding drum 16 is supported by a rotation @17, and this rotating shaft 17 is supported by bearings 18 and 19. The winding drum 16 is equipped with a torque motor 20 for winding or unwinding the cable 15 as the moving device travels so as not to create slack in the cable 15 between the stationary side on the ground and the moving device. are connected. This torque motor 20 connects a gear 22 provided through a speed reducer 21 and a gear 23 provided on the rotating shaft 17 of the winding drum 16 with a chain 24 to apply a constant torque to the winding drum 16. It is working. In addition, 25 is a magnetic brake.

The above structure is the same as that of the conventional example, and a particular feature of the present invention is that a twist prevention mechanism 17 is connected to the rotating shaft 17 to prevent twisting that occurs when the rotating side and the stationary side are directly connected with the cable 15. The details are as follows.

At the end of the rotating shaft 17 facing the winding drum 16, there is a rotating drum 26 having a diameter much smaller than that of the winding drum 16.
is fixed and provided integrally with the winding drum 16. The cable 15 whose part is wound around the winding drum 16 is disposed so that its moving device side passes through the rotation @17. Further, the cable 15 is wound around a rotating drum 26 connected to the rotating shaft 17 in a number equal to or greater than the maximum number of cable windings of the winding drum 16. Note that the cable 15 disposed within the rotating shaft 17 is fixed so as not to move within the rotating shaft 17. The rotating drum 2 is located on the cable fixed side 27 of the moving device coaxially with the rotating drum 26 and opposite thereto.
A fixed drum 28 having a diameter larger than 6 is provided and is fixed to the main body of the moving device.

Between the rotating drum 26 and the fixed drum 28, a cable 1 is connected between these two drums 26 and 28.
A cable twist prevention means 29 is provided to guide the winding and unwinding operations of the cable 15 and prevent the cable 15 from twisting. Specifically, each of the rotating drum 26 and the fixed drum 28 is provided with a bearing 30.31 as shown in FIG.
: The stake has been passed. In particular, the bearing 31 on the fixed drum 28 side
is provided on the cable fixed side 27 of the fixed drum 28. As shown in FIGS. 3 and 4, inside the fixed drum 28, a spiral spring 33 has one end attached to the inner wall of the fixed drum 28 and a narrow end attached to the support shaft 32 in order to apply a constant torque to the support shaft 32. It is fixedly provided. Furthermore,
A support arm 34 is provided between the rotating drum 26 and the fixed drum 28, the base end of which is fixed to the support shaft 32, and a guide pulley 35, which will be described later, attached to the distal end. This support arm 3
4, a guide pulley 35 is provided extending beyond the outer circumference of the fixed drum 28 in order to guide the exchange of the cable 15 between the rotating drum 26 and the fixed drum 28. The support part 36 of 35 is rotatably connected to the support arm 34 in the radial direction of the pulley 35, and
The mounting angle of the guide pulley 35 is such that the cable 15 extending from the winding portion of the drum 26, 28 to the guide pulley 35 fits optimally into the groove of the pulley 35.

Next, the effect will be explained.

When the moving device moves, the cable 15 of the moving force is wound up or rewound by the winding drum 16 accordingly. As the winding drum 16 rotates, the twist prevention mechanism functions as shown in FIGS. 5 and 6. 5 is a view taken along the line V-V in FIG. 3, and FIG. 6 is a view taken along the line IV--IV in FIG. 3, and these figures are simplified for the sake of explanation.

For example, when the winding drum 16 unwinds the cable 15, the rotary drum 26 also rotates by the same angle as the winding drum 16, and the cable 15 is unwinded. Figure 5 (a>(b)(C
) shows a state in which the rotating drum 26 sequentially rotates approximately - regeneratively to the left to wind the cable 15. This unwinding weakens the tension of the cable 15 running between the rotating drum 26 and the stationary drum 28. Since a constant moment 1~ in the left-handed direction is applied to the support arm 34 of the guide pulley 35 by the spiral spring 33, when the tension becomes weaker than this moment, the support arm 111
i134 begins to rotate to the left. When the support arm 34 rotates to the left, the cable 15 is wound around the fixed drum 28 by the guide pulley 35 by the angle of rotation of the arm 34, as shown in FIGS. 6(△), (B), and (C). It turns out. Incidentally, since the cable 15 is wound in multiple layers around the two drums 26 and 28, the winding diameter changes with time during winding or unwinding, but this is rotatably provided. This is allowed by the support part 36 of the pulley 35.

When the winding drum 16 winds up the cable 15, the operation opposite to the above is performed to prevent the cable 15 from twisting.

Since it operates as described above, the cable twist prevention means 29 prevents the cable 15 from twisting due to the forward and reverse rotation of the winding drum 16.
can be completely eliminated by

The cable 15 wound around the rotating drum 26, which has a much smaller diameter than the winding drum 16, is used to prevent twisting of the cable 15, and is preferably made as short as possible. For this reason, it is better to make the diameter of the rotating drum 26 as small as possible, taking into account the permissible bending limit of the cable 15.

In addition, a certain moment is applied to the support arm 34 of the guide pulley 35 by the spiral spring 33 (a certain torque is applied to the support shaft 32).
Therefore, there is a limit to the number of rotations of this arm 34. Therefore, the diameter of the fixed drum 28 is preferably as large as possible so that the number of turns of the cable 15 wound around the fixed drum 28, that is, the number of rotations of the support arm 34, can be reduced.

Furthermore, it is also possible to use a conventional slip ring (indicated by a broken line in FIG. 1) in order to supply power.

In this embodiment, the pulley 35 is used to guide the cable 15 between the rotating drum 26 and the stationary drum 28, but other guide members may be used as long as they can guide the cable 15.

[Effects of the Invention] In summary, the present invention exhibits the following excellent effects.

(1) Since the stationary side on the ground and the moving device are connected by a single cable, and a cable twist prevention means is provided in the middle, it is possible to eliminate twisting that occurs when winding or unwinding with a winding drum.

(2) Since the stationary side on the ground and the mobile device are connected with a single cable, optical fibers for communications etc. can be used.

(3) When using an optical fiber, there is no need to provide a connector because the cable is not interrupted, and a multi-core optical fiber cable can be used.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of the present invention, FIG. 2 is an enlarged perspective view of essential parts of the present invention, FIG. 3 is a side sectional view of FIG. 2, and FIG.
The drawings are a sectional view taken along the line IV--IV in FIG. 3, FIGS. 5 and 6 are views showing the operation of the present invention, and FIG. 7 is a plan view showing a conventional example. In the figure, 15 is a cable, 16 is a winding drum, 17 is a rotating shaft, 26 is a rotating drum, 27 is a cable fixed side of the moving device, 28 is a fixed drum, and 29 is a cable twist prevention means. Patent applicant Chika Ishikawajima Harima Heavy Industries Co., Ltd.
Hiroo Fuji, Patent Attorney Nobuo Kinutani Figure 4 (b) (8) Figure 5 Figure 6

Claims (1)

[Claims] A cable winding device that winds and unwinds the middle of a power or communication cable connected between a stationary side and a moving device onto a winding drum provided on the moving device, thereby allowing the moving device to travel freely. , a rotating drum located between the winding drum and the cable fixed side of the moving device, provided on the rotating shaft of the winding drum and for winding a cable passing through the rotating shaft; and the rotating drum. a fixed drum fixed to the cable fixing side of the moving device to face the moving device and winding up the cable; A cable winding device characterized in that it is equipped with means for preventing cable twisting.