WO2007086775A1

WO2007086775A1 - Device for winding a fiber-optic cable on a supporting wire

Info

Publication number: WO2007086775A1
Application number: PCT/RU2006/000667
Authority: WO
Inventors: Evgeny Borisovich Gaskevich
Original assignee: Zakrytoe Aktsionernoe Obschestvo 'opticheskie Mikrokabelnye Tekhnologii'
Priority date: 2006-01-24
Filing date: 2006-12-13
Publication date: 2007-08-02
Also published as: RU2309109C1

Abstract

The invention relates to overhead mounting of fibre-optic cables (FOC), in particular, to devices for winding a fibre-optic cable on a supporting wire. Said invention makes it possible to develop a device enabling a reliable and fast fixation of the FOC to the current-carrying wire or the lightening conductor of an overhead power transmission line. The inventive device comprises a frame (1), which is connected to a rotation drive (4) and is embodied in such a way that it is displaceable along the supporting wire (7) and rotatable thereabout , and a spool (2) which is used for winding the FOC, is arranged inside the frame (1) in such a way that it is rotatable in a vertical direction with respect to the frame axis of rotation, and is embodied in the form of two drums (2), which are rigidly fixed to a common shaft and are symmetrically spaced with respect to the supporting wire (7). The FOC is wound on both drums, which are provided with the FOC transitions from one to the other drum comprising the rotation drive (4) for rotating the frame (1) in such a way that said frame (1), together with the spool (2) arranged therein, being moved along the supporting wire (7), rotates thereabout, wherein, during the movement of the device along the supporting line (7), the FOC alternately unwinds from the drums (2) and spirally winds on the supporting wire (7).

Description

Device for winding fiber optic cable onto a carrier wire

FIELD OF THE INVENTION The invention relates to the field of aerial laying of fiber optic cables (BOK) and, in particular, to devices for winding BOK onto a carrying wire, including devices for winding BOK onto a current-carrying wire or lightning cable of an overhead power line )

State of the art

The standard and most common technologies for laying BOK on overhead power lines are suspension of a dielectric self-supporting optical cable and replacing a ground wire with a ground wire with an integrated optical cable. However, these technologies are inconvenient or practically not applicable for transmission lines of low and medium voltage classes. In particular, on a power transmission line of voltage up to 35 kV inclusive, in most cases there is no lightning cable and the addition of a lightning cable with an integrated optical cable is impossible. Self-supporting optical cable often does not fit into the design of power lines, reduces its reliability due to additional wind and ice loads. In many countries, the use of self-supporting optical cable is prevented by another problem - vandalism. A self-supporting optical cable, suspended at a small height on the poles of power lines, looks like a cable with copper pairs and often becomes the subject of theft. Other technologies for laying BOK over an overhead power line (replacing a current-carrying wire with a current-carrying wire with an integrated optical cable, attaching the optical cable to the carrier wire with special clamps or tape, etc.) are rarely used because of their high cost and for other reasons.

An effective alternative to replacing a ground wire or using a self-supporting BOK is the technology of winding a thin optical cable onto a current-carrying wire or ground wire of a power transmission line. This technology can be used on power lines of low, medium and high class voltages.

The installation of fiber optic cable by the method of winding can be performed using a universal winding machine. For this type of installation, specialized devices have been developed - winding machines (see DE 3702781 Al, 08/08/1988 and DE 3228227 C2, 02/02/1984) Their principle of operation is as follows: one mechanism (traction) allows the device to move uniformly along the cable, the second mechanism (winding) at the same time rotates the drum fixed on the machine with the construction length of the cable around the cable. Fiber optic cable is simultaneously unwound from the drum and wound onto a cable.

Before the passage of the next passage on the supports, special bridges are strengthened, necessary for preparing the mechanisms for work.

The winding machine rises to the support and hangs on the cable with a towing device in the direction of movement. A drum with a cable is installed on the machine. In places of approach to the support, the cable is fixed with a special clamp, which prevents it from unwinding from the cable. After that, the traction and winding devices are started.

The construction length of the cable is wound on the span between the two supports.

When the winding machine approaches the next support, the cable is again fixed with a clip that prevents it from unwinding, after which the machine is dismantled and can be used on the next span.

On the support itself, the cable is fixed on both sides by anchor clamps.

Improving the design of machines for winding fiber-optic cable allowed to create the device disclosed in RU 21315 Ul, 10.01.2002 and which is the closest analogue of the claimed invention. The device for aerial laying of fiber optic cable (BOK) on a carrier wire contains two coils designed for winding BOK and connected with a rotation drive, while the coils are mounted on the shaft with the possibility of joint rotation and are located symmetrically relative to the carrier wire, BOK is wound on both coils, with the BOK switching from one coil to another.

The objective of the claimed invention is to provide a device that provides reliable and fast fastening of a fiber optic cable on a current-carrying wire or ground wire of an overhead power line. SUMMARY OF THE INVENTION

The technical result of the claimed invention is achieved using a device for winding fiber optic cable (BOK) on a carrier wire containing a frame associated with a rotation drive that is located outside the frame and configured to rotate around the carrier wire, and a BOK winding coil installed inside the frame with the possibility of rotation perpendicular to the axis of rotation of the frame. In one of the embodiments of the invention, the coil is made in the form of two drums rigidly mounted on a common shaft and spaced symmetrically relative to the carrier wire, while the shaft is fixed at its ends on the frame from the inside.

In yet another embodiment of the invention, the BOK is wound on both drums, wherein the transitions of BOK from one drum to another are made in such a way that the angle between the BOK vanishing point from one drum and the BOK entry point on the other drum is projected onto a plane perpendicular to the axis of rotation coil, is 180 degrees. In this case, the length of the BOK section between the vanishing point from one drum and the entry point to another drum is approximately equal to half the circumference of the drum.

In yet another embodiment of the invention, the inner walls of the drums ("cheeks") have special cutouts with rounded edges that ensure smooth winding of the BOK when moving from one drum to another and guarantee a bending radius of BOK no less than the critical bending radius of BOK.

In one embodiment of the invention, the rotation drive, which is located outside the frame, provides the translational movement of the frame into the rotational movement of the frame so that when moving along the main wire, the frame with a coil installed inside it rotates around the main wire.

In yet another embodiment of the invention, the BOK winding device further comprises a tensioner mounted on the frame and designed to maintain a predetermined BOK tension. BOK passes through the tensioner, while on the one hand the tensioner provides tension The BOK required to lay the BOK on the base wire, and on the other hand, the tensioner provides the tension of the BOK in the section between the tensioner and the coil no more than is necessary for winding the BOK from the coil.

In one embodiment of the invention, the BOK winding device comprises a rear support, and the BOK winding device is supported on a carrier wire with two points: the rotation drive rollers and the rear support.

In one embodiment of the invention, the rear support is made in the form of a system of rollers mounted on the frame with the possibility of rotation relative to the frame in a plane perpendicular to the axis of rotation of the frame, while the center of gravity of the device is located below the point of contact with the rear support of the carrier wire.

In another embodiment of the invention, the rear support is made in the form of a sleeve mounted on the frame, while the carrier wire passes inside the sleeve, and when the device moves along the carrier wire, the sleeve slides along the carrier wire.

In yet another embodiment, the BOK winding device further comprises a springy jerk absorber designed to dampen the BOK jerks when switching from drum to drum.

In yet another embodiment of the invention, the BOK winding device further comprises a balancer mounted on a rotation drive that prevents rotation of the rollers by which the rotation drive rests on the carrier wire around the carrier wire when the device is moving along the carrier wire.

A brief description of the drawings in FIG. 1 shows a device for winding BOK onto a carrier wire, top view. in FIG. 2 shows a device for winding BOK onto a carrier wire, side view. in FIG. 3 shows a coil, a top view. in FIG. 4 shows a coil, side view. DETAILED DESCRIPTION OF THE INVENTION

A device for winding a BOK onto a support wire shown in FIG. 1, 2, contains the following main structural elements:

• frame 1 associated with the rotation drive 4 • coil 2 mounted inside the frame 1 with rotation

• back support 6

• heavy weight 5

• springy shock absorber 8 • balancer 9

The frame 1 is supported on the supporting wire 7 at two points - by the rollers of the rotation drive 4 and the rear support 6. The frame 1 is driven along the supporting wire 7 either from the ground using a tow rope or using a special tractor (the tractor can be mounted on a supporting wire in front of the device, and the traction of the tractor can be transmitted to the device by means of a hitch). A coil 2 is installed inside the frame 1, which can rotate freely on the shaft, and the coil shaft is fixed at its ends on the frame from the inside. The rotation drive 4 provides the translational movement of the frame 1 in the rotational movement of the frame 1 so that when moving along the main wire 7, the frame 1 with the coil 2 installed on it rotates around the main wire 7.

Coil 2 is made in the form of two drums rigidly mounted on a common shaft (axis) and spaced symmetrically with respect to the carrier wire 7. BOK is wound on both drums to maintain balancing of the device when moving along the carrier wire 7. When winding BOK onto the drums, BOK transitions from one drum to another, so that the angle between the BOK vanishing point from one drum and the BOK approach point to another drum, in a projection onto a plane perpendicular to the coil shaft, is 180 degrees, FIG. 3, 4. Moreover, the inner walls of the drums (“cheeks”) 10 have special cutouts Sl and S2 with rounded edges that ensure smooth winding of the BOK when switching from one drum to another and guarantee a bending radius of BOK no less than critical bending radius BOK. In this case, the length of the BOK section between the vanishing point from one drum and the entry point to another drum is approximately equal to half the circumference of the drum.

When moving along the main wire 7, the frame 1 with the coil 2 installed on it rotates around the main wire 7, as a result of which the BOK is wound off the coil 2 and spirals onto the main wire 7 with a certain winding pitch. In this case, the BOK is wound alternately from different drums, which minimizes the displacements of the center of gravity of the device when it moves along the supporting wire 7. To maintain the specified tension of the BOK when winding onto the supporting wire 7, a weight 5 is used in the claimed device.

The weight 5 is a system of rollers that maintains a given BOK tension while winding the BOK onto a carrier wire. The BOK passes through the tensioner, on the one hand, the tensioner provides the BOK tension necessary to lay the BOK on the carrier wire, and on the other hand, the tensioner provides the BOK tension in the section between the tensioner and the coil no more than is necessary for winding the BOK from the coil. The tractor is fixed on the frame and when the device moves along the carrier wire rotates around the carrier wire together with the frame. When moving in the opposite direction (rollback), the weight carrier also maintains the specified BOK tension, choosing the excess BOK.

The rear support 6 can be made in the form of a system of rollers, which can be mounted on the frame with the possibility of rotation relative to the frame in a plane perpendicular to the axis of rotation of the frame, or in the form of a sleeve mounted on the frame so that the carrier wire passes inside the sleeve.

In addition, to extinguish BOK jerks when switching from drum to drum, a special additional device is used - a spring jerk absorber 8. In addition, to prevent the rotation of the rollers, which the rotation drive rests on the carrier wire, around the carrier wire when the device moves along the carrier wire, it is used special additional device - balancer 9, mounted on a rotation drive.

Claims

Claim

1. Device for winding fiber optic cable (BOK) onto a carrier wire, comprising a frame associated with a rotation drive and configured to move along the carrier wire and rotate around the carrier wire, and a BOK winding coil mounted inside the frame to rotate perpendicularly the axis of rotation of the frame, while the coil is made in the form of two drums rigidly mounted on a common shaft and spaced symmetrically relative to the carrier wire, and BOK is wound on both drums, while the transitions BOK from one used a rabana to another, in which the rotation drive transfers the translational motion of the frame into the rotational movement of the frame so that when moving along the main wire the frame with a coil installed inside it rotates around the main wire, while moving the device along the main wire BOK is alternately wound from the drums and spirals onto the supporting wire.

2. The device according to claim 1, characterized in that the angle between the BOK vanishing point from one drum and the BOK approach point to another drum, in a projection onto a plane perpendicular to the shaft of the coil, is approximately 180 degrees.

3. The device according to claim 2, characterized in that the inner walls of the drums have special cutouts with rounded edges, which ensure smooth winding of the BOK when switching from one drum to another and guaranteeing a bending radius of BOK no less than the critical bending radius of BOK.

4. The device according to claim 3, characterized in that the length of the BOK section between the vanishing point from one drum and the entry point to another drum is approximately equal to half the circumference of the drum.

5. The device according to claim 1, characterized in that it further comprises a weighting device mounted on a frame that supports a given tension

BOK, which is wound onto the supporting wire, and ensures the BOK tension between the heavy and the coil no more than is necessary for winding the BOK from the coil.

6. The device according to claim 5, characterized in that the weighting unit is configured to maintain a predetermined tension BOK wound on the carrier wire, also when the device stops and the device rolls back.

7. The device according to claim 1, characterized in that it comprises a rear support.

8. The device according to p. 7 characterized in that the rear support is made in the form of a system of rollers mounted on the frame with the possibility of rotation relative to the frame in a plane perpendicular to the axis of rotation of the frame.

9. The device according to claim 8, characterized in that the center of gravity of the device is located below the point of contact by the system of rollers of the carrier wire.

10. The device according to claim 7, characterized in that the rear support is made in the form of a sleeve fixed to the frame, while the carrier wire passes inside the sleeve, and when the device moves along the carrier wire, the sleeve slides along the carrier wire.

11. The device according to claim 1, characterized in that it further comprises a springy jerk absorber designed to dampen the BOK jerks when switching from drum to drum.

12. The device according to claim 1, characterized in that it further comprises a balancer fixed to the rotation drive, designed to prevent the rotation of the rollers by which the rotation drive rests on the carrier wire around the carrier wire when the device moves along the carrier wire.