Method of linear spiral armature manufacturing. RU patent 2519259.

IPC classes for russian patent Method of linear spiral armature manufacturing. RU patent 2519259. (RU 2519259):

H02G1/04 - for mounting or stretching (wire stretchers in general B25B0025000000)

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Method for manufacturing spiral-shaped clamp / 2259621
Proposed method meant for use in manufacturing spiral-shaped clamps for fastening self-bearing conductors on 6 - 35 kV overhead power transmission lines involves treatment of several steel wires to twist together their central sections and to transform their circular sections into spirals of desired pitch and diameter. Thermosetting tube is put on wires and clamping eye is shaped. Wire spirals are placed in oven and exposed therein to temperature of 150 - 180 °C for 10 minutes, whereupon ends of extreme sections of wires are fused. Clamps manufactured by this method are noted for ability of multiple reuse and provide for reliable fixation of wires or cables designed for operation under severe conditions (ice, wind, vibrations, and the like).

Method of linear spiral armature manufacturing / 2519259
Method lies in processing of rigid members made as threads (metal wires with protective coating or without it, non-metal rods, etc.). Wire with diameter from 0.1 mm up to 24 mm are unwounded from coils, cut into sections, at that a spherical shape is provided to ends of the cut sections, the cut sections are collected into bundles and fastened into a strand with length determination of the strand middle part, the strand is twisted in turns with their number from 1 up to 150 turns; the middle part of the strand can remain unwind for certain cases of application for the manufactured linear spiral armature; then end parts of the strand are shaped as spiral with a regular pitch and diameter, or with an alternating pitch and diameter or with a regular pitch and alternating diameter and vice a versa. Length Lm of the strand medium part is defined from the below ratio: Lm=(0.05÷3)·(L1+L2/2), where L1 is the strand length measured from the left end of the medium part up to the left end of the strand in a ready-to-use article while L2 is the strand length measured from the right end of the medium part up to the right end of the strand in a ready-to-use article respectively.

FIELD: electricity.

SUBSTANCE: method lies in processing of rigid members made as threads (metal wires with protective coating or without it, non-metal rods, etc.). Wire with diameter from 0.1 mm up to 24 mm are unwounded from coils, cut into sections, at that a spherical shape is provided to ends of the cut sections, the cut sections are collected into bundles and fastened into a strand with length determination of the strand middle part, the strand is twisted in turns with their number from 1 up to 150 turns; the middle part of the strand can remain unwind for certain cases of application for the manufactured linear spiral armature; then end parts of the strand are shaped as spiral with a regular pitch and diameter, or with an alternating pitch and diameter or with a regular pitch and alternating diameter and vice a versa. Length Lm of the strand medium part is defined from the below ratio: Lm=(0.05÷3)·(L1+L2/2), where L1 is the strand length measured from the left end of the medium part up to the left end of the strand in a ready-to-use article while L2 is the strand length measured from the right end of the medium part up to the right end of the strand in a ready-to-use article respectively.

EFFECT: method features simplicity of the process for manufacturing of linear spiral armature and it may be implemented in stationary and field conditions, and the articles manufactured with its use are characterised by low own costs and high operational reliability.

16 cl, 1 dwg

The invention relates to the field of power engineering, in particular to methods for producing linear spiral fittings, such as spiral clamps for mounting one or more wires as insulated and non-protected, to whip or reference linear insulators, other insulating constructions or not insulating constructions, and also for fastening of fiber-optic cables overhead transmission lines of all voltage classes and air lines of communication, respectively.

There is a method of manufacturing clamping spiral type for attaching protected self-bearing wires to the supports of overhead power lines 6-35 kV, which consists in processing of steel wire by giving it the form of a spiral with a constant pitch, in connection strands, rounding the tips of the wire strands and forming fastening loops, with the first Central segments of the steel wire is intended for fastening loops forming connect with each other, twisting them with each other, then the end pieces of the wire strands processed to give them a shape of a spiral specified diameter and spacing, and the bond of several wires in strands shall be implemented by use heat shrink tubing, which pushes the entire length of each wire strands, then molded mounting loop, placed a wire spiral in thermal chamber for 20-30 minutes at a temperature of 150-180°C, remove them from thermal chamber and time after exposure rounded tips of the wire spirals performed by melting them to obtain sealed in material shrink tube ends of the wire spirals [1].

This method of manufacturing clamping spiral type is applicable solely to secure self-supporting wires of overhead electrical power lines 6-35 kV, that is only for lines of low voltage classes, which significantly limits the scope of its practical use. In addition, this method is time consuming, as it is linked with the necessity of applying the technology of fastening wires in strands through heat-shrink tubing (need expensive thermal cameras; the process of fixing heat-shrink tubing on the wires strictly regulated and long).

Also known method of manufacture of linear spiral fittings, consisting in the processing of rigid elements in the form of threads limited or unlimited length by giving it the shape of a spiral, the bond in strands by drawing on their surface coatings, made on the basis of a composite material, or composition of the powder paints and shape the final product [2].

This well-known method is not free from shortcomings also. As a material for manufacturing line fittings in this way is taken mainly steel wire, which in some cases may affect the condition of the contact surface attached to the line spiral reinforcement of the object, for example, insulator, fiber optic cable, or even wire when exposed to mechanical factors such as vibration, dancing, ice covering on overhead transmission lines and fiber-optic communication lines.