RU2704488C1 - Connecting dummy clamp - Google Patents

Abstract

FIELD: electricity; power engineering.

SUBSTANCE: invention relates to electric power engineering and can be used as connecting point clamps when performing work with wires not insulated for overhead transmission lines, as well as with steel cables (ground wires) for protection of overhead power lines from direct lightning strikes. Clamp consists of two dies 1 with two finned chutes 2 in each die bolted together by means of bolt joint 5. In the cutters there are cutouts 3 so that during the assembly of the clamp the wire of the die engages with each other. Radius R of rounding of chute 4 is determined by average diameter of group of fixed wires and provides reliable clamping of both minimum and maximum diameter wires. On the inner side of the surface of the slices, along the entire length, ribbing is made along two chutes, besides, the ribs have triangular shape with rounded tops.

EFFECT: use of a connection die-like clamp of the given design will allow to expand the range of diameters of the used wires, and also it will allow to reduce weight and metal consumption, to ensure reliable connection of wires without their damage.

1 cl, 1 dwg

Description

The invention relates to the field of electric power and can be used as connecting die clamps when working with wires of uninsulated aluminum, steel-aluminum for overhead power lines.

Known Die clamp for lightning protection cables of overhead power lines, (see the description of patent for invention No. 2024140 RU H02G 7/05, published: 11/30/1994), comprising a housing made in the form of two dies with grooves for cables or wires, and their mechanism clamping bolt type, characterized in that one of the dies is made in the form of a straight plate, and each trough of the other die is formed by two radii, smoothly passing sequentially from one to another.

The disadvantages of this die clamp are the complexity of manufacturing tooling for the manufacture of the die, in which each trough is formed by two radii, smoothly moving sequentially from one to another.

Due to the fact that one of the dies is made in the form of a straight plate, it is not possible, after fixing by the clamping mechanism of the bolt type, to save the cross-section of a cable or wire of round profile.

Known Connection clamp for steel ropes and steel wires (see the description of the patent for invention RU 2372698, H02G 7/05, published: 10.11.2009. Bull. No. 31). The invention relates to the field of electric power and can be used as connecting clamps for steel ropes and steel wires when grounding overhead power lines. The clamp is made of a rectangular case, a trough-shaped die, bolted connection with a latch at the end of the bolt.

The disadvantages of such a clamp include the complexity on the inner bent surface of the bent edges of the die to make triangular notches with a height of (0.4 ÷ 0.95) mm.

During the final tightening with a fixed-torque wrench due to the fact that the die body is made of a rectangular sheet, the outer surface of the steel wire rope or steel wire is crushed, its original cross-sectional shape is lost, which will inevitably lead to a decrease in the reliability of this product, not to ensure regulatory strength sealing steel ropes and steel wires.

Fixation by local plastic deformation, punching is used only when the threaded connection does not need to be disassembled in operation, but when re-using the clamp, it is necessary to clean the contact surfaces of the housing and at least one die of the profile section, which is problematic without dismantling the clamp.

Known connecting die clamp (see the description of the patent for invention RU 2365008, H02G 7/05, published: 08/20/2009. Bull. No. 23). The invention relates to the field of electric power and can be used as connecting die clamps for connecting aluminum, steel-aluminum and protected wires in loops and branches of overhead power lines. The clamp consists of a housing and several dies in which grooves are made. The connected wires are laid in the grooves of the housing and dies and fastened with bolted connections.

With the relative simplicity of the design of the clamp, the following problematic issues should be noted. On the surface of the grooves of the casing and the dies, the triangular-shaped protrusions are made with a small height and the distance between the peaks of the protrusions, which will lead to an increased amount of torque when tightening the bolt connection with a key, which will lead to a change in the shape of the connected wires, and a reduction in its service life. Dies based on one bolted connection when tightening the nuts tend to turn around the axis of the bolt, which can lead to damage to the wire. It is noted as a positive solution when, after tightening the bolts, the wires take an oval shape and are pressed into the body of the bolts. Such contact and a change in the shape of the wire during vibrations from the action of the wind load are stress concentrators, which will ultimately affect the operational performance of the wire.

The purpose of the invention is to develop a connecting die clamp, which provides normalized strength of termination of uninsulated aluminum, steel-aluminum wires for overhead power lines, which will expand the diameter range of the wires used, as well as reduce the weight and metal consumption, ensure reliable connection of wires without damaging them.

The above-mentioned positive technical result was achieved due to a new set of distinctive design solutions of the connecting die clamp, consisting of two dies with two finned grooves in each die, fastened with a bolt connection. Cuts are made in the dies in such a way that when assembling the clamp on the wire, the dies mesh with each other. The cutouts allow the clamp, due to lateral gaps, varying from 0.15 mm to 0.25 mm, depending on the range of wire diameters, to smoothly enter the joint without distortion when tightening the bolted connection, and also during assembly to avoid distortion between the dies by side surfaces. The main purpose of the cutouts is to provide an extension of the range of diameters of the wires used, since due to the cuts, the side surfaces of the dies do not abut against each other, but pass through each other, which reduces the cross section formed by finned grooves, which in turn allows the use of smaller clamps the diameter of the wire than currently used with the classic design of the clamp. The radius R of the rounding of the gutter of the dies is determined by the average diameter of the group of fastened wires, selected so as to ensure reliable clamping of both the minimum and maximum diameter of the wire. On the inner side of the surface of the dies, along the entire length there is a ribbing along two troughs, the ribs having a triangular shape with rounded vertices in cross section. The height of the profile of the ribs is adopted in the range H = (0.5 ÷ 2.0) mm, the step of the ribs T = (0.9 ÷ 5.0) mm. The distance between the axes of the finned grooves of the dies is determined as A = (1.0-3.0) d _cf. wires d _cf. wires - the average diameter of the wire from the group of wires mounted in the clamp for these dies. The length of the dies is determined from the following relationship L = (3.7 ÷ 5.4) d _{cf. wires} dice width B = (3.2-4.7) d _{cf. wires} .

The completed ribbing of the dies due to the specially selected shape of the ribs eliminates the slipping of the wire in the clamp without damaging them.

The invention is illustrated in the drawing, where in FIG. 1 shows a General view of the connecting die clamp, consisting of two dies 1 with grooves 2 located on the sides, having cutouts 3, ribs 4 in the grooves of the dies. The dies are interconnected by bolted connections 5. The invention works as follows. Before mounting the connecting clamp, the bolt joint 5 is disassembled beforehand, the clamp is disassembled, the ends of the connected wires are prepared, as well as the finned grooves 2 dies 1, in accordance with the technical regulations. The connected ends of the wire are stacked in the finned grooves 2 towards each other so that they exit from the ends of the clamp at a distance of about 10 mm, after which two bolted joints 5 are assembled by hand, with the final tightening with a key with a fixed torque.

The main advantage of this device is the expansion of the diameter range of the wires used, as well as the reduction in mass and metal consumption due to the use of cutouts in the structure, ensuring the standard strength of the connected uninsulated aluminum and aluminum-steel wires without damage due to the use of specially selected finning of the gutters.

Claims (1)

Connecting die clamp for connecting non-insulated aluminum, steel-aluminum wires for overhead power lines, containing two dies with two finned grooves in each die, bolted together, cuts are made in the dies so that when assembling the clamp on the wire, the dies mesh with each other , lateral gaps between the dies vary in the range from 0.15 mm to 0.25 mm, depending on the diameter range of the group of wires mounted in the clamp, the radius R of the rounding of the groove of the dies op is divided by the average diameter of the group of fixed wires, on the inner side of the surface of the dies along the entire length there is a ribbing along two grooves, the ribs have a triangular shape in section with rounded peaks, the height of the profile of the ribs varies in the range H = (0.5 ÷ 2.0) mm, rib spacing T = (0.9 ÷ 5.0) mm, the distance between the axes of the finned grooves A, the length L, the width B of the dies, are determined from the following relationships A = (1.0-3.0) d _cf. where d _{cf wires} - the average diameter of the wire from the group of wires mounted in the clamp for these dies, L = (3,7 ÷ 5.4) d _{cf. wires} , V = (3.2-4.7) d _{cf. wires} .

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