RU2313873C1 - Suspension clamp - Google Patents

Abstract

FIELD: electrical power engineering, in particular, helical-shaped suspension clamps for fastening of optical self-carrier communication cables on support of air power lines.

SUBSTANCE: the clamp is made in the form of a helical protector and a strand of power wire spirals. The protector and the strand are completely coated by a special plastic (polyvinylidene chloride or polyethylene) and wound on the cable so that their helical turns would not touch one another. The length of the protector (L_protector)is selected from the dependence of the length of the strand (L_strand) from relation: L_protector /L_strand = 0.3÷1.1. The strand loop is fixed by the clamp and inserted in the trough of the suspension that is made in the form of a Ω-shaped profile or in the form of a disk.

EFFECT: simple in manufacture and reliable in service: characterized by low manufacture expenditures, doesn't injure the cable sheath and can be reused after the primary dismantling.

7 cl, 1 dwg

Description

The invention relates to the field of electric power, in particular to supporting clamps of a spiral type, designed to suspend optical self-supporting non-metallic communication cables on the supports of overhead power lines.

A support clamp is known, which is a preformed bar (tread) in the form of a spiral of a certain length and pitch, covering the cable tightly around the circumference, while the middle part of the spiral is made in the form of a twisted loop, for which the clamp is attached to the line support [1].

This design of the supporting clamps of the spiral type is simple, easy to mount on the lines, but at the same time has a number of significant drawbacks:

- insufficient reliability of work on overhead power lines, due to the loose fit of the ends of the spiral tread on the cable;

- a high probability of damage to the cable sheath with a spiral protector, especially with strong winds and vibrations.

The closest technical solution to the proposed one is a support clip for hanging an optical self-supporting non-metallic communication cable on the supports of overhead power lines, containing a suspension, a spiral protector, a strand of power wire spirals, consisting of at least two branches and loops wound over the cable, fixed to the suspension [2].

However, this clamp is also not without significant drawbacks. Firstly, the design of this clamp is extremely complicated, which is most likely due to its functional purpose - it is designed to work both as a supporting clamp and a tension clamp. In addition, the clamp is suitable exclusively for suspension of wires of overhead power lines and when the fiber-optic cable of the communication line is fixed, the ends of the wire spirals will damage the cable sheath. Labor costs for the manufacture of such clamps are quite large, since the inner surfaces of the spiral strands and tread are coated with a mixture of glue with an abrasive to ensure reliable adhesion of the tread and strands to the surface of the wire or cable, while the manufacturing process using this technology is unsafe and time-consuming.

The applicant set himself the specific practical task of developing a spiral-type support clamp that is simple enough in design and reliable during long-term operation for suspension and fastening of optical self-supporting non-metallic cables of communication lines, fixed, for example, on poles of overhead power transmission lines of low voltage or a contact network of railways , electric city transport, etc. A technical positive result from the use of the inventive spiral support clamp is to ensure its reliable operation for a long uninterrupted service life, simplicity of construction and installation, and reduction of cost and manufacturing costs. The specified result is achieved due to a new set of essential design features that are stated in the next version of the claims: "support clip for hanging an optical self-supporting non-metallic communication cable on the supports of overhead power lines, containing a suspension, a spiral protector, a strand of power wire spirals, consisting of at least least of two branches wound over the cable and a loop fixed to the suspension; the spiral protector and a strand of power wire spirals are located in a sheath made of a layer of plastic coating, the spiral protector is wound on the cable so that the turns of the tread are located between the turns of the branches of the strands of power wire spirals, the suspension is made in the form of an Ω-shaped profile with a groove along its circular perimeter, into which the loop of the strand of power wire spirals is inserted, while the length of the spiral tread l of the _tread depends on the length of the strand of power wire spirals l of the _lock and is selected from the relation l _tread / l _locks = 0.3 ÷ 1.1; the step of winding the spiral tread is equal to the step of winding the strands of power wire spirals; a loop of a strand of power wire spirals is fixed to the suspension by means of a clamp; polyvinyl chloride is selected as a plastic coating; polyethylene is selected as a plastic coating; the suspension is made in the form of a disk with a groove along its circular surface.

The invention is illustrated in the drawing, which shows a General view of a support clip made according to the present invention, a front view perpendicular to the cable of the communication line.

The proposed support clip consists of a spiral tread 1, strands 2 of power wire spirals and suspension 3. Strand 2 is made in the form of two branches 4, 5, wound on cable 6, and a loop 7, into which suspension 3 is inserted, fixed on a support (not shown ) The spiral tread 1 is also wound onto cable 6, but the turns of its spirals are located between the turns of branches 4, 5 of strand 2. The spiral tread 1 and strand 2 of power wire spirals are completely covered by a plastic coating layer, for example, a layer of polyvinyl chloride (PVC) or a layer of polyethylene. The loop 7 of the strand 2 of the power wire spirals in some convenient place for installation is fixed with a clamp 8. The steps for winding the spiral tread 1 and the strand 2 of the power wire spirals are usually the same. Suspension 3 is made in the form of an Ω-shaped profile with a groove along its circular perimeter or, alternatively, in the form of a disk also with a groove along its circular surface, a loop 7 of a strand 2 of power wire spirals is inserted into these grooves. The length l of the _{tread of the} spiral tread 1 directly depends on the length _{l of the} strand of the strand 2 of the power wire spirals and is determined from the ratio l of the _tread / l of the _strand = 0.3 ÷ 1.1.

Mounting the clamp is as follows.

Spiral tread 1 and strand 2 of power wire spirals made on molding equipment are fully protected by a layer of plastic coating (polyvinyl chloride, polyethylene). For this, the tread 1 and strand 2 are dipped into a plastic liquid solution by dipping and then baked in a heating cabinet at a certain temperature and time delay. After that, the finished spiral protector 1 is wound onto the cable 6, and then the finished strand 2 branches 4, 5 are wound onto the cable 6 so that its spiral turns are located between the turns of the spiral tread 1, suspension 3 is inserted into the loop 7 by the trench the support clip is ready for delivery to the line, where it is attached to the intermediate support of the line by the suspension 3.

The declared supporting clamp of a spiral type is simple in its design, its manufacturing technology is not expensive and is environmentally friendly (harmful manual technology for applying glue with abrasive to the surface is excluded), reliable in operation due to the optimal choice of the ratio between the lengths of the spiral tread and the strand power wire spirals, does not damage the cable, because it is hermetically sealed with a plastic coating, has a good design in appearance, can be repeated It must be used after dismantling. MZVA CJSC has launched mass production of these supporting clamps manufactured under the brand name of the PZO 75 series.

Information sources

[1] US patent "Cable protector" No. 2,230,611, class 248-63, published 04.02.1941

[2] US patent "Cable suspension and anchoring means and method" No. 2,947,504, class 248-63, published 02.08.1960

Claims (7)

1. A support clip for hanging an optical self-supporting non-metallic communication cable on overhead power lines, comprising a suspension, a spiral protector, a strand of power wire spirals, consisting of at least two branches wound over a cable and a loop fixed to the suspension, characterized in that that the spiral protector and a strand of power wire spirals are located in a sheath made of a layer of plastic coating, the spiral protector is wound onto the cable so that the turns of the tread are located between y coils branches strands power wire spirals, the suspension is formed with a groove into which is inserted the loop strands power wire spirals, the spiral tread length l _{of the tread} is dependent on the length of the strand strength wire spirals l _strand and is selected from the relation: l _tread / l _strand = 0 , 3 ÷ 1.1. 2. The clamp according to claim 1, characterized in that the step of winding the spiral tread is equal to the step of winding the strands of power wire spirals. 3. The clamp according to claim 1, characterized in that the loop of the strand of the power wire spirals is fixed to the suspension by means of a clamp. 4. The clamp according to claim 1, characterized in that polyvinyl chloride is selected as the plastic coating. 5. The clamp according to claim 1, characterized in that polyethylene is selected as the plastic coating. 6. The clamp according to claim 1, characterized in that the suspension is made in the form of a disk with a groove along its circular surface. 7. The clamp according to claim 1, characterized in that the suspension is made in the form of an Ω-shaped profile with a groove along its circular perimeter.