RU2415032C1 - Dropper for attaching contact wire to carrying cable - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention refers to electric transport industry, and can be used in overhead catenaries of overhead system of electric railways. Dropper for attaching the contact wire to carrying cable is made of polyimide twisted plain-laid rope. One end of polyimide rope is made so that it can be connected to contact wire by means of dropper clip through thimble, and the other end can be connected to carrying cable by means of loop assembly. Dropper is equipped with adjusting clamp installed in its middle part to adjust the length of the latter. Adjusting clamp can be made of galvanised or copper-clad steel wire with diametre of 3-4 mm.

EFFECT: simplifying the design and installation of dropper, as well as enlarging its service life.

2 cl, 2 dwg

Description

The invention relates to the field of electric transport and can be used in contact suspensions of the contact network of electric railways.

The contact suspension string is used to isolate the contact wire from the support cable in order to prevent electro-corrosion damage at the joints of the links.

Known copper strings of contact suspension, having a constant length, in which the loops at the ends of the strings are made either by twisting the wire, or by crimping it with a sleeve (Markvardt K.T., Vlasov I.I. “Contact network”, M .: Transport, 1977, pp. .63-65).

Also known is a string for attaching a contact wire to a bearing cable of a contact suspension (RU 22917 U1, B60L 1/00, 05/10/2002), which is made of wire and includes thimbles and clamps, one of the clamps being made in the form of a sleeve with two wires covering the wire holes in which the bracket is inserted, and the ends of the bracket are divorced after mounting the clamp.

The disadvantages of this string are the complexity of the design and the complexity of installation.

The technical result of the claimed invention is to simplify the design and installation of the string, as well as increasing its life.

The specified technical result is achieved in that the string for attaching the contact wire to the supporting cable is made of a polyamide twisted three-strand rope with a diameter of 3-6 mm, one end of which is made with the possibility of connection with the contact wire through a string clamp through the thimble, and the other with the possibility of connection with carrying cable through a loop node, while the string is equipped with an adjusting bracket mounted in the middle of the string.

In this case, the adjusting bracket can be made of galvanized or steel-copper wire with a diameter of 3-4 mm.

The manufacture of a string from a polyamide twisted three-strand rope with a diameter of 3-6 mm, one end of which is made with the possibility of connecting with a contact wire through a string clamp through a thimble, and the other with the possibility of connecting with a support cable through a loop knot, and the ability to control the length of the string the adjusting bracket installed in the middle part of the string provides non-ferrous metal savings by reducing the cost of string clamps and bimetallic steel-copper wire, using s in the known solutions, as well as ease of installation, reliability and durability of the strings despite the simplicity of design.

Strings are primarily mounted on heavily loaded sections, on high rises, on uninsulated interfaces in ice melting schemes, on large bridges and other places where there is increased mechanical and electromechanical wear of the strings.

Do not install the strings in places where electric arc or thermal influences are possible, for example, in the places of sediment and pulling of locomotives with mixed traction, in open air gaps with protection against burns, etc.

To fix polyamide ropes directly on wires or clamps, various types of knots can be applied: simple single, loop, combined and simple double.

The best option is that the string is mounted on a supporting cable with a loop knot, and with a contact wire - by means of a simple double knot using a string clamp through a thimble.

For the manufacture of strings using a polyamide (for example, kapron) twisted three-strand rope of a cable twist, which is made in its entirety.

Optimal is the implementation of strings with a diameter of 3-6 mm. The choice of this range is due to the fact that the diameter of less than 3 mm does not ensure the reliability of the string during operation due to the formation of a "wave" in front of the current collector of the electric rolling stock, and is also subjected to a hood. Increasing the diameter of more than 6 mm is impractical because it does not have a significant effect on improving performance, but increases the material consumption and string weight, which can adversely affect the state of the contact suspension.

To facilitate the adjustment of the length of the polyamide rope (height adjustment of the contact wire), it is advisable to insert an adjusting bracket into the string. Winding the required number of turns, provide the desired string length. The adjusting bracket is also designed to compensate for the extraction of nylon ropes during operation. The adjusting bracket can be made of galvanized or steel-copper wire with a diameter of 3-4 mm.

The essence of the claimed invention is illustrated by drawings, where figure 1 schematically shows the mounting of the string, figure 2 is a General view of the adjusting bracket.

Figure 1 shows a string made of a polyamide twisted three-strand rope 1 for attaching a contact wire 2 to a support cable 3. One end of the polyamide rope 1 is made with the possibility of connecting to the contact wire 2 through a string clamp 4 through a copper thimble 5, and the other end of the polyamide the rope 1 is made with the possibility of connection with the supporting cable 3 by means of a loop node 6. To adjust the length of the string (or contact wire 2 in height during installation) it contains an adjusting bracket 7 (figure 2), installed in Wed the back of the polyamide rope 1 (string).

A string is made and mounted for attaching a contact wire to a supporting cable of an electrified railway as follows.

From a polyamide twisted three-strand rope 1 of a cable twist, a string of the desired length is made. The length of the polyamide rope 1 (string) is determined by the structural height of the contact suspension in the places of installation of the strings, taking into account the required margin for nodes and adjustment. Having measured the desired length, the polyamide rope 1 is cut with a special cutter or an ordinary knife. To prevent fluffing, the ends of the polyamide rope 1 must be bandaged and melted with a candle or blowtorch. One of the ends of the polyamide rope 1 is fixed on the supporting cable 3 by tying a simple single knot 6.

Then the second end of the polyamide rope 1 is connected to the contact wire 2 using a string clamp 4 through the thimble 5 with a simple double knot.

After that, in the middle part of the polyamide rope 1 insert the adjusting bracket 7. Winding the required number of turns, provide the desired length of the polyamide rope 1 (string).

Thus, the claimed string not only provides isolation of the contact wire from the support cable, but also is distinguished by its simplicity of design, reliability and durability, it is easy to assemble and dismantle, provides real savings in non-ferrous metals, and also eliminates overflow and electromechanical wear.

Claims (2)

1. A string for attaching a contact wire to a support cable, characterized in that the string is made of a polyamide twisted three-strand rope, one end of which is made with the possibility of connection with the contact wire by means of a string clamp through a thimble, and the other with the possibility of connection with the support cable by means of a loop node, while the string is equipped with an adjusting bracket installed in the middle of the string. 2. The string according to claim 1, characterized in that the adjusting bracket is made of galvanized or steel-copper wire with a diameter of 3-4 mm

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