JPS6111170Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a winding device that unwinds and winds up wires, ropes, cables, etc., and particularly handles long cables attached to self-propelled vehicles equipped with industrial televisions, etc. This invention relates to a cable winding device suitable for

Conventionally, various tension adjustment means have been adopted in unidirectional devices that let out or wind up long objects such as threads, ropes, and paper cloth under tension adjustment. A device for appropriately controlling tension with a single device for work in two opposite directions requires complicated limiting means, and no practical device has been provided. Therefore, for example, as shown in Figure 1, in the event of a leakage accident in underground gas pipes, etc., in order to detect the crack failure location, it is necessary to set intervals of about 100 m.
Dig it up, cut the pipe, and connect wire 3 from one end.
a, connect it to the ground winding machine 1a on the other end side, connect the wire 3a to a vehicle equipped with a television camera 2a for pipe inspection, and connect it in one direction with the cable 3 attached to the vehicle equipped with the television camera 2a. The ground winding machine 1 on the cable 3 side is used for pulling and moving, inspecting in one direction, and then inspecting in the opposite direction.
After the inspection is completed, it is necessary to disconnect the wire 3a or cable 3 and use the ground winding machines 1a and 1b to wind it up. It was a laborious process, and the inspection distance was limited to approximately 120 meters, requiring excavation in two locations.

The purpose of the present invention is to obtain a cable winding machine that can improve the above-mentioned disadvantages. First, a self-propelled vehicle 2 equipped with a television camera attached to a cable was driven back and forth about 100 meters inside one pipe A, and after performing a reciprocating inspection, the inside of the other pipe B was inspected in the same manner. 200m with one excavation.
The above inspection is made possible by adapting the tension of the cable 3 to the movements of the self-propelled vehicle and changes in cable length, as well as changes in the required tension. Adjustments are made appropriately using a simple cable tension sensing mechanism.

Embodiments of the present invention will be described below with reference to side views.

FIG. 2 is a side view schematically showing the winding device of the present invention. A cable tension sensing actuation mechanism S is provided at the end of the pedestal of the winding device 1, which has a cable drum 23 that is rotated forward and backward by an electric drive. and the mechanism S
is provided with a gear housing 4, a fixed pulley 5 on the outside thereof, and a movable pulley 6 pivotally attached to the tip of a swinging arm 7,
It is swingably attached to a shaft 25 erected at the tip of a frame 26 which is supported by a shaft 27 at the end of the frame. For example, when the winding device 1 is mounted on a truck loading platform as shown in FIG. 2, the frame 26 protrudes outside the loading platform during work, and is retracted into the truck as shown by the dotted line in FIG. 3 when the work is completed. It is rotated so that

The cable 3 is surrounded by a fixed pulley 5 and a movable pulley 6, and is connected to a winding cable drum 23 via a traverse mechanism 24, and the tip of the cable 3 is connected to the self-propelled vehicle 2.

FIG. 4 is a longitudinal sectional side view of the gear housing 4, and the arm shaft 8 on which the swinging arm 7 is fixed is connected to the gear frame 9 in the housing, and is shown in FIG. 5 in the direction of the arrow AA. As shown, small gears 10 and 11 are held inside the frame 9 in a meshed state. The pinion 10 coaxially fixes the pinion 12 outside the frame 9, and also the pinion 11.
The small gear 13 on the outside of the frame 9 on the opposite side is coaxially fixed.

The small gear 12 meshes with a large gear 14, as shown in FIG. 17, and its rotation range is limited to 90 degrees by a stopper 16 protruding from the inner wall of the gear housing 4 that fits into the arcuate groove 17. Further, the small gear 13 meshes with a large gear 15 as shown in FIG. 19, and is fitted into the arcuate groove 19 by a stopper 18 protruding from the inner wall of the gear housing 4.
Its rotation range is limited to 90°.

Furthermore, between the large gear 15 and the inner wall of the gear housing 4,
A coil spring 20 loosely fitted to the arm shaft 8 is interposed, and one end of the coil spring 20 is connected to the gear housing 4.
In addition, the other ends are respectively engaged with the large gears 15, and their elastic force causes the stopper 18 to come into pressure contact with one end of the arcuate groove 19, as shown in FIG.

These states shown in FIGS. 6 and 7 are the conditions of the movable pulley 6.
This shows the case when the cable tension is not increased.

As described above, a differential gear mechanism having the arm shaft 8 as an input shaft and the large gears 14 and 15 as output sides is configured in the gear case 4.

In addition, 21 and 22 are large gears 14 and 15, respectively.
The small gear for the sensor meshes with the cable drum 23, and its rotation is connected to an electric signal means (not shown) that controls an electric circuit that drives the cable drum 23.

The winding device of the present invention is constructed as described above, and its operation will be explained below.

As shown in FIG. 8, when the cable 3 is connected to the movable pulley 6 and the fixed pulley 5 and is let out,
When the payout speed becomes lower than the moving speed of the self-propelled vehicle 2, tension is generated in the cable 3, pulling the movable pulley 6 upward, and the arm shaft 8 rotates in the X direction. At the same time, the gear frame 9 in the gear case 4 rotates in the X direction, and accordingly the large gears 14 and 15 both try to rotate in the x direction as shown in FIGS.
5 is elastically pressed in the y direction by the coil spring 20, only the large gear 14 rotates in the x direction by an angle twice the rotation angle of the arm shaft 8 due to the differential mechanism, and the large gear 15 , the sensor pinion 22 and the sensor remain in their original state.

The rotation of the large gear 14 is 90 degrees as described above.
Therefore, the swing angle of the arm 7 is limited to 45 degrees as shown in the lower part of FIG. 3, and the slack adjustment is performed within that range.

Sensor small gear 21 meshing with large gear 14
converts tension fluctuations in this range into electrical signals,
The rotation of the cable drum 23 is changed.

When the cable 3 is wound up, the movable pulley 6 is pulled up by the tension, and the arm shaft 8 is
direction and rotate the large gear 14 in the same way as when feeding out.
rotates in the x direction, and after the stopper 16 comes into contact with the other end of the arcuate groove 17, tension control is started. That is, when the tension of the cable 3 becomes even greater, the large gear 15 rotates in the x direction while resisting the elastic force of the coil spring 20, and the cable 3
The rotation of the cable drum 23 by the rotation of the sensor small gear 22 is controlled to vary so that the tension of the coil spring 20 and the elastic force of the coil spring 20 are in balance.

During this time, the gear wheel 14, the sensor pinion 21 and the sensor are kept in a maximum operating state.

When winding up the long cable 3, it is necessary to wind it up so that it does not slacken, so the tension is greater than when it is unrolled.
To prevent cable 3 from sagging by swinging within a range of
Further, the rotation of the cable drum 23 is changed so as not to forcefully pull the self-propelled vehicle.

A potentiometer, a differential transformer, etc. can be used to convert the rotation of the sensor small gears 21 and 22 into electrical signals.

Furthermore, it goes without saying that the control polarity of the sensor must be reversed between the time of feeding and the time of winding up.

In the above embodiments, a differential gear mechanism made of spur gears is used, but even if a general differential gear mechanism using bevel gears or a differential mechanism using levers, links, etc. is adopted, A similar effect can be obtained. Further, the arcuate grooves 17 and 19 provided in the large gears 14 and 15 are not necessarily limited to a rotation angle range of 90 degrees, but can be set to any range in terms of design.

Since the present invention has the above-described structure and operation, it uses a differential mechanism to detect fluctuations in tension fluctuation conditions during feeding and winding by the swinging of the same movable pulley. Since the rotation of the cable drum can be effectively controlled, it is extremely effective as a cable winding device for moving various cables, especially for inspecting television cameras in underground pipes using self-propelled vehicles.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional underground pipe inspection method, Fig. 2 is an explanatory diagram showing a mode of using the winding device of the present invention, and Fig. 3 is an explanatory diagram of an embodiment of the winding device of the present invention. The schematic side view, FIG. 4, is a longitudinal cross-sectional view of the gear case, and FIGS. The illustrative diagram, FIG. 8, is an explanatory diagram showing the operating range of the swing arm. DESCRIPTION OF SYMBOLS 1... Winding device, 2... Self-propelled vehicle, 3... Cable, 4... Gear casing, 5... Fixed pulley, 6... Movable pulley, 7... Swinging arm, 8... Arm shaft, 9...
...gear frame, 10, 11, 12, 13...small gear,
14, 15... Large gear, 16, 18... Stopper, 17, 19... Arc groove, 20... Coil spring, 21, 22... Small gear for sensor, 23...
...cable drum.

Claims (1)

[Scope of utility model registration request] In a winding device that lets out and winds up a cable 3, a swinging arm 7 is provided with a movable pulley 6 at the tip that swings due to the tension of the cable 3, and a differential mechanism is used to control the rotation of the swinging arm shaft 8. It is interlocked with two large gears 14 and 15 via one of the large gears 15.
The rotation range of both large gears 14 and 15 is limited while applying a spring elastic force in the direction opposite to the rotation of swing arm 7 to , 22 to the control signal circuit of the electric circuit for rotationally driving the cable drum 23, the cable drum 23 can be controlled in different swing ranges of the swing arm 7 when the cable 3 is fed out and when the cable 3 is wound up. A cable winding device characterized in that it is equipped with a cable tension sensing actuation mechanism S that changes rotation.