RU2232455C1 - Compression-type strain clamp - Google Patents

Abstract

FIELD: power engineering.

SUBSTANCE: proposed compression-type strain clamp designed for fixing steel-aluminum conductors and steel cables to corner dead-end pole of power transmission line has steel anchor made in the from of rod with hole to receive steel core of conductor, lug for fixing clamp to pole, and aluminum casing with shank for compressing anchor with conductor steel core, aluminum part of conductor, and conductor running to stub. Steel anchor and aluminum casing have their section similar in shape to that of conductor being erected. Cross-sectional area of aluminum casing F_c is larger than that of aluminum part of conductor F_a.p. so that F_c : F_a.p. ratio is between 1.5 and 5.0. Length L_comp of aluminum casing part being compressed is chosen from expression L_comp : D_c = 4.5 - 7.3, where D_c is diameter of conductor being erected.

EFFECT: reduced metal input for aluminum casings which reduces cost of clamp.

1 cl, 3 dwg

Description

The invention relates to the field of electric power, and more specifically to extensible clamps for fastening steel-aluminum wires and steel ropes to the anchor-angle supports of overhead power lines.

Known extruded clamp for multi-wire wires and steel ropes of overhead power lines, containing a metal body with an eye, and the clip is provided with a flexible wire element enveloping the body, the ends of which are loose, and a sleeve pressed during installation, worn on the loose ends of the flexible element and intended for location it meets the said ends of the flexible element of the loose ends of the wire being mounted, while the cross section of the flexible element is two times smaller than the section of the wire being mounted rovoda [1].

However, such a clamp has significant disadvantages, namely:

- the complexity of the design of this clamp; the introduction of the design of an additional flexible wire element and sleeve, fixing during installation the loose ends of the wires of the inserted element, not only leads to complication, but also complicates the installation of the clamp;

- high labor costs in the manufacture and installation of the clamp, due to the multi-element and complexity of the design.

The closest technical solution in relation to the proposed one is a pressure-tightened clamp for attaching steel-aluminum wires to the anchor-angle supports of overhead power lines, containing a steel anchor made in the form of a rod with a hole for fixing the steel core of the wire in it, an eye for attaching the clip to the support and aluminum case with a shank for crimping the anchor with a steel core of the wire, the aluminum part of the wire and the wire going into the cable [2].

The disadvantages of this clamp are the increased labor costs in its manufacture, arising due to the need to carry out flats in the anchor, which provides crimping of the clamp with round dies, high metal consumption of aluminum cases, because the ratio of the cross-sectional area of the aluminum case to the cross-sectional area of the aluminum part of the wire being mounted is 3.5-7.0, and also due to the large length of the pressed part of the wire, which is in the range from 7.5 to 8.0 times the diameter of the wire being mounted.

The technical result achieved by the implementation of this invention is to reduce labor costs by simplifying the design of the clamp (the anchor is made without flats), as well as to reduce the metal consumption achieved by the optimal choice of the ratio of sizes of the elements of the clamp, since non-compliance with these ratios can lead to insufficient the strength of wire sealing in the clamp, or to a significant increase in metal consumption, which affects the cost of the clamp.

The specified technical result is achieved due to a combination of essential design features reflected in the claims, namely: a compressible tension clamp for fixing steel-aluminum wires to the anchor-angle supports of overhead power lines, contains a steel anchor made in the form of a rod with a hole for fixing steel wire core, an eye for attaching the clamp to the support and an aluminum case with a shank for crimping the anchor with a steel wire core, aluminum hour ty wires and wires going into the loop; moreover, the steel anchor and the aluminum casing are made with a cross-section identical in shape to the cross-section of the wire being mounted, while the cross-section F _{k of the} aluminum casing is chosen to be larger in area than the cross-section F _a.pr. the aluminum part of the wire over the area so that the ratio F _k : F _a.pr. is in the range of 1.5-5.0, and the length L _ODA. extruded part of the aluminum casing is selected from the ratio of L _opr. : D _approx. = 4.5-7.3, where D _approx. - diameter of the wire being mounted.

The invention is illustrated by drawings, where in Fig.1 is a General view of the tension pressed clamp made in accordance with the present invention, a front view perpendicular to the wire line; in FIG. 2 is a section along arrows AA in FIG. 1; figure 3 is a section along the arrows BB in figure 1

The proposed design of a pressed tension clamp for attaching steel-aluminum wires 1 to the anchor-angle supports of overhead power lines consists of a steel anchor 2 with grooves 3 and an eye 4, for which the clamp is attached to the support of the line, as well as an aluminum body 5. Steel anchor 2 is made in the form a circular cross-section rod with a longitudinal hole 6 into which the steel part (core) 7 of the wire 1 is inserted when crimping the wire 1 mounted in the clamp. The aluminum clamp body 5 has a shank 8 for pressing w nufa wire 9. The steel anchor 2 and the aluminum housing 5 are taken of the same round cross-section as the mounted wire 1. In this case, to significantly save metal, the ratio of the cross-sectional area of the aluminum housing 5 and the aluminum part (coil) of wire 1 is selected within certain limits, and it is F _k : F _a.pr. = 1.5-5.0, where F _k is the cross-sectional area of the aluminum clip body 5; F _a.p. - the cross-sectional area of the aluminum part (coil) of the wire being mounted 1. In addition, the length of the pressed part of the aluminum housing 5 is calculated and selected in a certain way with respect to the diameter of the wire being mounted 1, for example, L _opr. : D _approx. = 4.5-7.3, where L _opp. - the length of the pressed part of the aluminum housing 5; D _approx. - diameter of the mounted wire 1.

The inventive clamp is mounted as follows.

First, wire 1 is prepared for installation, for which the aluminum wire is removed for a length equal to 1.3 of the length of the pressed part of the anchor L _a.opp. , then an aluminum case 5 is started on wire 1, while the steel part (core) 7 of wire 1 is inserted into the longitudinal hole 6 of steel anchor 2 and the first crimping of the anchor 2 with the steel core 7 of wire 1 is carried out. The next step, the case 5 moves to anchor 2 to stop in the protrusion, and in the absence of it, keeping the distance (L) from the vertical axis 10 of the eye 4 of the anchor 2 to the end face 11 of the housing 5, after which the risks are pressed from the housing 12 of the housing 5 with the wire 1 and the shank 8 of the housing 5 with a loop wire 9 which p ed that is inserted into the shank 8 of the housing 5.

After the crimping operation, the clamp through the eye 4 is attached to the anchor-angle support of the overhead power line.

The inventive tension extruded clamp for attaching steel-aluminum wires to the anchor-angle supports of overhead power lines can significantly reduce the metal consumption of aluminum cases (1.3-2.0 times or 30-100%), reduce the complexity of manufacturing, since the clamp elements in particular, the anchor and the hull are now performed without flats (faces) and, therefore, do not require additional processing operations; the clamps are mounted with hexagonal dies, the sizes of which are selected depending on the type of wire, which ensures the mechanical and electrical characteristics required during operation on the lines, in particular crimping with hexagonal dies ensures uniform crimping of the wire with the housing and ultimately higher clamp reliability compared to with crimping round dies.

Sources of information

1. USSR author's certificate No. 1014083, class H 02 G 7/02, dated 11.08.81

2. Insulators and fittings of overhead power lines and open switchgears. Catalog No. 560069, Vneshtorgizdat, 1976, p. 112, Fig. 107.

Claims (1)

Pressable clamp for fixing steel-aluminum wires to the anchor-angular supports of overhead power lines, containing a steel anchor made in the form of a rod with a hole for fixing the steel core of the wire, an eye for attaching the clip to the support and an aluminum case with a shank for crimping the anchor with steel the core of the wire, the aluminum part of the wire and the wire going into the cable, characterized in that the steel anchor and the aluminum body are made with a cross section identical in shape with the cross-section of the wire being mounted, while the cross-section F _{k of the} aluminum casing over the area is chosen to be large compared to the cross-section F a _. the aluminum part of the wire over the area so that the ratio F _k : F _a.pr. is in the range of 1.5 ÷ 5.0, and the length L _opr. the pressed part of the aluminum casing is selected from the ratio L _opr. : D _np. = 4.5 ÷ 7.3, where D _ave. Is the diameter of the wire being mounted.

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