Fatigue-resistant copper alloy dropper wire for electrified railway

Abstract

The utility model relates to the technical field of electrified railway contact networks, and particularly discloses an anti-fatigue copper alloy dropper wire for an electrified railway, which comprises a copper alloy wire core and an insulating layer coated on the outer surface of the copper alloy wire core, the copper alloy wire core is formed by twisting a plurality of same wire core strands; the wire core strand is formed by twisting a first copper alloy monofilament and a plurality of second copper alloy monofilaments; and the diameter ratio of the first copper alloy monofilament to the second copper alloy monofilament is 1: (0.44-0.45). By optimally designing the structure of the copper alloy dropper wire, controlling the diameter ratio of the first copper alloy monofilament to the second copper alloy monofilament and controlling the number of stranded strands of the stranded wires, the copper alloy dropper wire reduces the single-wire gap after stranding, enables the copper alloy wire core to be stranded more tightly, can prevent the problems of looseness, strand breakage, wire breakage and the like of the stranded wires after high-frequency vibration, and improves the production efficiency of the copper alloy dropper wire. Meanwhile, the strength and the bending resistance of the dropper wire are improved, so that the service life and the stability of the dropper wire are prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electrified railway contact network, in particular to a fatigue-resistant copper alloy suspension string for electrified railway. Background Art

[0002] In the electrified railway system, the dropper plays an important role in suspending and supporting the contact network. The working environment of the electrified railway is complex. The contact network must not only withstand the impact and high-frequency vibration of the high-speed train, but also experience harsh natural environments such as high temperature and sunshine, low temperature and rain and snow. Therefore, in the actual operation process, the existing dropper often breaks, which seriously endangers the operation safety of the electrified railway.

[0003] Traditional suspension strings are usually made of 7 copper alloy single wires of the same diameter twisted into one strand, which are then twisted into a copper alloy core, that is, twisted in a 7*(1+6) manner to form a copper alloy core. Although suspension strings with this structure have good electrical conductivity, the gap between the single wires is large after twisting, and there are problems such as easy erosion and aging by the harsh external environment, or loosening of the strands after high-frequency vibration, resulting in the service life and stability of the suspension strings failing to meet the use requirements. Utility Model Content

[0004] The purpose of the utility model is to design a fatigue-resistant copper alloy suspension string for electrified railways in view of the problems that the existing suspension string structure is prone to corrosion and aging and the stranded wire is prone to loosening, which effectively solves the problems that the existing suspension string is prone to corrosion and aging, poor fatigue resistance, and the stranded wire is prone to loosening, thereby improving the service life and stability of the suspension string.

[0005] The utility model is realized through the following technical solutions:

[0006] A fatigue-resistant copper alloy dropper wire for electric railway is designed, the copper alloy dropper wire comprising: a copper alloy wire core and an insulating layer coated on the outer surface of the copper alloy wire core;

[0007] The copper alloy wire core is formed by twisting a plurality of identical wire core strands; the wire core strands are formed by twisting a first copper alloy monofilament and a plurality of second copper alloy monofilaments; the diameter ratio of the first copper alloy monofilament to the second copper alloy monofilament is 1:(0.44-0.45).

[0008] Specifically, the purpose of the utility model is to provide a fatigue-resistant copper alloy suspension string for electrified railways. It can be understood that the utility model uses 1 copper alloy monofilament with a diameter of a and 10 copper alloy monofilaments with a diameter of 0.44a~0.45a to twist into 1 strand, and then twist 7 strands into a copper alloy core, that is, the twisting method is 7*(1+10), and then a layer of high temperature resistant, corrosion resistant, aging resistant and wear resistant material is coated on the outer surface of the twisted copper alloy core to form an insulating layer, so as to solve the problem that the existing suspension strings are prone to broken strands and broken wires, thereby improving the mechanical strength and bending resistance of the suspension strings, and then improving its service life and stability.

[0009] Furthermore, a fatigue-resistant copper alloy dropper wire for electrified railways: the copper alloy dropper wire also includes: an adhesive layer coated on the outer surface of the copper alloy wire core, and the adhesive layer is arranged between the copper alloy wire core and the insulating layer.

[0010] Preferably, the utility model further provides an adhesive layer between the copper alloy wire core and the insulating layer to improve the bonding force between the copper alloy wire core and the insulating layer.

[0011] Furthermore, a fatigue-resistant copper alloy suspension string for electrified railways: the copper alloy wire core is formed by twisting 7 identical wire core strands.

[0012] Furthermore, a fatigue-resistant copper alloy suspension string for electrified railways: the core strands include: 1 first copper alloy monofilament and 10 second copper alloy monofilaments; the 10 second copper alloy monofilaments are twisted with 1 first copper alloy monofilament to form 1 core strand.

[0013] Furthermore, a fatigue-resistant copper alloy suspension string for electrified railway: the diameter ratio of the first copper alloy monofilament to the second copper alloy monofilament is 1:0.447.

[0014] Beneficial effects of the utility model:

[0015] (1) The utility model optimizes the structure of the copper alloy suspension string, controls the diameter ratio of the first copper alloy monofilament and the second copper alloy monofilament, and controls the number of twisted strands of the strands, thereby reducing the single wire gap after twisting, making the copper alloy wire core twisted more tightly, and preventing the strands from loosening, breaking, and breaking after high-frequency vibration. At the same time, the strength and bending resistance of the suspension string are improved, thereby extending its service life and stability.

[0016] (2) The copper alloy suspension string designed by the utility model can effectively prevent the corrosion and aging of the copper alloy core due to the harsh environment such as high temperature sunshine, low temperature rain and snow, by coating the copper alloy core with an insulating layer, and can further prevent the loosening of the strands after high-frequency vibration, or even the breaking of strands and wires, thereby extending the service life of the copper alloy suspension string. The utility model can also improve the bonding force between the copper alloy core and the insulating layer by providing an adhesive layer, thereby preventing the insulating layer from peeling off or falling off during use.

[0017] (3) The copper alloy dropper string of the utility model also has high electrical conductivity and good mechanical strength, and can meet the use requirements of the electric railway system for dropper strings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic structural diagram of a fatigue-resistant copper alloy suspension string for electrified railways designed for Example 1 of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of a fatigue-resistant copper alloy suspension string for electrified railways provided in Comparative Example 1.

[0021] Markings in the figure: 1-first copper alloy single wire, 2-second copper alloy single wire, 3-adhesive layer, 4-insulating layer, 5-third copper alloy single wire. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom" and the like indicate positions or positional relationships, which are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second" and the like are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein.

[0024] Example 1

[0025] like Figure 1 As shown, a fatigue-resistant copper alloy dropper wire for electric railway is provided, the copper alloy dropper wire comprising: a copper alloy wire core, and an adhesive layer 3 and an insulating layer 4 sequentially coated on the outer surface of the copper alloy wire core;

[0026] Wherein: the copper alloy wire core is formed by twisting 7 identical wire core strands;

[0027] Each core strand is twisted by twisting 1 first copper alloy monofilament 1 with a diameter of a and 10 second copper alloy monofilaments 2 with a diameter of 0.447a; then 7 strands of the same core strands are twisted to form a copper alloy core, that is, a twisting method of 7*(1+10) is adopted; after twisting, an adhesive layer 3 and an insulating layer 4 are sequentially wrapped on the outside of the copper alloy core, so as to obtain a fatigue-resistant copper alloy suspension string for electrified railways. The setting of the insulating layer 4 can effectively protect the copper alloy core from corrosion by the external environment. Ten second copper alloy monofilaments 2 are twisted around one first copper alloy monofilament 1.

[0028] Comparative Example 1

[0029] like Figure 2 As shown, a copper alloy dropper wire for electrified railway is provided, the copper alloy dropper wire comprising: a copper alloy wire core, and an adhesive layer 3 and an insulating layer 4 sequentially coated on the outer surface of the copper alloy wire core;

[0030] Wherein: the copper alloy wire core is formed by twisting 7 identical wire core strands;

[0031] Each core strand is formed by twisting 7 third copper alloy monofilaments 5 with the same diameter, and then the 7 core strands are twisted to form a copper alloy core, that is, comparative example 1 adopts a 7*(1+6) twisting method; after twisting, an adhesive layer 3 and an insulating layer 4 are wrapped in sequence on the outside of the copper alloy core to obtain a copper alloy suspension string for electrified railways.

[0032] The difference between Comparative Example 1 and Example 1 is that Example 1 uses copper alloy monofilaments of different diameters to twist together to form the core strands, while Comparative Example 1 uses copper alloy monofilaments of the same diameter to twist together to form the core strands.

[0033] The suspension string structure designed in the above-mentioned embodiment 1 is a structure in which one copper alloy monofilament (first copper alloy monofilament 1) with a diameter of a and ten copper alloy monofilaments (second copper alloy monofilament 2) with a diameter of 0.447a are twisted into one strand of wire core strand, and then twisted into 7 strands to form a copper alloy core, that is, the twisting method is 7*(1+10). This method can reduce the single wire gap after twisting, so that the copper alloy core is twisted more tightly, which not only makes the suspension string have good mechanical strength, but also improves the bending resistance of the suspension string and prolongs its service life.

[0034] However, the suspension string structure provided in Comparative Example 1 has a large gap between single wires after twisting, and impurities such as external corrosive water vapor can easily enter the interior of the suspension string through the gap, thereby aggravating the corrosion and aging of the suspension string. At the same time, due to the large gap between single wires, the suspension strings of this structure are prone to loosening after twisting through high-frequency vibration, ultimately resulting in the service life and stability of the suspension strings failing to meet the use requirements.

[0035] The above preferred embodiments of the utility model are only used to explain the utility model, and are not used to limit the utility model. Any obvious changes or modifications derived from the technical solution of the utility model are still within the protection scope of the utility model.

Claims

1. A fatigue-resistant copper alloy suspension wire for electric railway, characterized in that: The copper alloy suspension string comprises: a copper alloy wire core and an insulating layer (4) coated on the outer surface of the copper alloy wire core; The copper alloy wire core is formed by twisting a plurality of identical wire core strands; the wire core strands are formed by twisting a first copper alloy single wire (1) and a plurality of second copper alloy single wires (2); The diameter ratio of the first copper alloy single wire (1) to the second copper alloy single wire (2) is 1:(0.44-0.45).

2. The fatigue-resistant copper alloy dropper wire for electric railway according to claim 1, characterized in that: The copper alloy suspension string further comprises: an adhesive layer (3) coated on the outer surface of the copper alloy wire core, and the adhesive layer (3) is arranged between the copper alloy wire core and the insulating layer (4).

3. The fatigue-resistant copper alloy suspension wire for electric railway according to claim 1, characterized in that: The copper alloy wire core is formed by twisting 7 identical wire core strands.

4. The fatigue-resistant copper alloy dropper wire for electric railway according to claim 1, characterized in that: The core strand comprises: one first copper alloy single wire (1) and ten second copper alloy single wires (2); Ten second copper alloy single wires (2) are twisted with one first copper alloy single wire (1) to form one core wire strand.

5. The fatigue-resistant copper alloy dropper wire for electric railway according to claim 1, characterized in that: The diameter ratio of the first copper alloy single wire (1) to the second copper alloy single wire (2) is 1:0.447.

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