Composite contact applied to railway electromagnetic relay and assembly thereof

Abstract

The utility model belongs to the field of railway electromagnetic relays, and particularly relates to a composite contact applied to a railway electromagnetic relay and an assembly thereof. The utility model provides a composite contact applied to a railway electromagnetic relay. The composite contact comprises a substrate layer, a transition layer and a wear-resistant layer. The substrate layer is made of Ag-Cu-Ni alloy; the outer surface of the substrate layer is coated with the transition layer, and the transition layer is made of AgSnO2; the outer surface of the transition layer is coated with the wear-resistant layer, and the wear-resistant layer is made of Ag-Graphene. According to the composite contact applied to the railway electromagnetic relay and the assembly thereof provided by the utility model, the arc erosion resistance of the contact can be improved, the steady-state contact resistance can be reduced, and cadmium-free environment-friendly materials are used.

Description

Technical Field

[0001] This utility model belongs to the field of railway electromagnetic relays, specifically relating to a composite contact and its components used in railway electromagnetic relays. Background Technology

[0002] Existing railway electromagnetic relay contacts all adopt a simple strip structure and are mostly made of silver-cadmium oxide (AgCdO) alloy. This structure and material generally have many problems, such as the node resistance increasing with the degree of oxidation, affecting the stability of signal transmission, and arc erosion easily causing pitting distortion on the contact surface, shortening the service life. In addition, cadmium has high environmental risks. Utility Model Content

[0003] This utility model provides a composite contact and its components for use in railway electromagnetic relays, which can effectively solve the problems in the background art.

[0004] This utility model provides a composite contact for use in railway electromagnetic relays, comprising a base layer, a transition layer, and a wear-resistant layer; the base layer is made of Ag-Cu-Ni alloy; the transition layer is coated on the outer surface of the base layer and is made of AgSnO2; the wear-resistant layer is coated on the outer surface of the transition layer and is made of Ag-Graphene.

[0005] As a further optimization of this utility model, the composite contact is a strip with a superior arc cross-section, wherein the chord surface is used for fixing and the superior arc surface is used as a conductive contact surface.

[0006] As a further optimization of this utility model, the thickness of the base layer is 0.5-1.2mm.

[0007] As a further optimization of this utility model, the thickness of the transition layer is 50-80μm.

[0008] As a further optimization of this utility model, the wear-resistant layer thickness is 15-30μm.

[0009] This utility model also provides a component, including a copper sheet and the aforementioned composite contact used in railway electromagnetic relays;

[0010] The copper sheet is strip-shaped, with one end fixed and the other end forked into two layers from the middle. One layer is horizontal, and the other is curved. The horizontal layer is horizontal, while the curved layer is bent into an arc shape away from the horizontal layer. The end of the curved layer faces the surface of the horizontal layer and a connector is installed there.

[0011] As a further optimization of this utility model, the end of the arc-shaped layer is forked into two halves from the middle, and each half is provided with a composite contact.

[0012] As a further optimization of this utility model, the part of the arc-shaped layer where the composite contact is installed is bent into a "Z" shape towards the horizontal layer.

[0013] As a further optimization of this utility model, the horizontal layer is bent into a "Z" shape in the direction away from the arc-shaped layer.

[0014] This utility model provides a composite contact and its components for use in railway electromagnetic relays, which can improve the contact's resistance to arc erosion and reduce steady-state contact resistance. All materials used are cadmium-free and environmentally friendly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the cross-sectional structure of the contact point in Example 1;

[0016] Figure 2 This is a schematic diagram of the component structure of Example 2;

[0017] Among them, there is composite contact 1, base layer 1a, transition layer 1b, wear-resistant layer 1c, copper sheet 2, horizontal layer 2a, and arc-shaped layer 2b. Detailed Implementation

[0018] Example 1

[0019] like Figure 1 As shown, the composite contact 1 in this embodiment includes a base layer 1a, a transition layer 1b, and a wear-resistant layer 1c.

[0020] The substrate 1a is made of Ag-Cu-Ni alloy with a thickness of 0.5-1.2 mm. The substrate 1a is used to provide support for the foundation and conductivity of the foundation.

[0021] The transition layer 1b is coated on the outer surface of the substrate layer 1a. The transition layer 1b is made of AgSnO2 and has a thickness of 50-80μm.

[0022] The wear-resistant layer 1c is coated on the outer surface of the transition layer 1b. The wear-resistant layer 1c is made of Ag-Graphene and has a thickness of 15-30μm.

[0023] In this embodiment, the composite contact 1 is made into a strip with a superior arc cross-section, wherein the chord surface is used for fixing and the superior arc surface is used as a conductive contact surface.

[0024] A comparative experiment was conducted using the composite contact 1 in this embodiment and a traditional pure silver-cadmium oxide alloy, and the following results were obtained:

[0025] (1) After 100,000 switching cycles, the resistance increment in this embodiment is ≤15%, while the resistance increment in the comparative example is ≥40%;

[0026] (2) The anti-fusion welding current in this embodiment can be as high as 120A, while the anti-fusion welding current in the comparative example is ≤80A;

[0027] (3) The material cost of this embodiment can be reduced by about 18% compared to the comparative example.

[0028] Example 2

[0029] like Figure 2 As shown, the components provided in this embodiment include not only the composite contact 1 of Embodiment 1, but also a copper sheet 2.

[0030] The copper sheet 2 is strip-shaped. One end of the copper sheet 2 is used for fixing. The other end of the copper sheet 2 is forked into two layers from the middle. The lower layer is a horizontal layer 2a, which is a horizontal strip-shaped sheet. The upper layer is an arc-shaped layer 2b, which is bent into an arc shape away from the horizontal layer 2a. The composite contact 1 is installed on the surface of the arc-shaped layer 2b facing the horizontal layer 2a.

[0031] Preferably, the end of the arc-shaped layer 2b is forked into two halves from the middle, and each half is provided with a composite contact 1.

[0032] Preferably, the portion of the arc-shaped layer 2b at which the composite contact 1 is installed is bent toward the horizontal layer 2a into a step or a "Z" shape.

[0033] Preferably, the horizontal layer 2a forms a step-like shape downwards, that is, it bends into a "Z" shape in a direction away from the arc-shaped layer 2b.

[0034] All of the above preferred structures can enhance the elasticity and recovery effect of the composite contact 1 during electrical contact.

[0035] It should be noted that the terms "upper," "lower," "left," and "right" in this application refer to the accompanying drawings in the specification, and are intended to more intuitively express the technical solution, not to limit the scope of protection.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A composite contact for use in a railway electromagnetic relay, characterized in that, The composite contact point comprises a base layer, a transition layer and a wear-resistant layer; the base layer is made of Ag-Cu-Ni alloy; the transition layer is coated on the outer surface of the base layer and is made of AgSnO2; and the wear-resistant layer is coated on the outer surface of the transition layer and is made of Ag-Graphene.

2. A composite contact assembly for use in a railway electromagnetic relay according to claim 1, wherein The composite contact point is in the shape of a strip with an optimal arc cross section, wherein the chord surface is used for fixation and the optimal arc surface is used as a conductive contact surface.

3. The composite contact for use in a railway electromagnetic relay according to claim 1, wherein The thickness of the base layer is 0.5-1.2mm.

4. The composite contact for use in a railway electromagnetic relay according to claim 1, wherein The thickness of the transition layer is 50-80μm.

5. The composite contact for use in a railway electromagnetic relay according to claim 1, wherein The thickness of the wear-resistant layer is 15-30μm.

6. An assembly characterized by, The composite contact point is applied to a railway electromagnetic relay. The copper sheet is in the shape of a strip, one end of the copper sheet is fixed, and the other end of the copper sheet is bifurcated into two layers from the middle, one of which is a horizontal layer and the other is an arc-shaped layer; the horizontal layer is in the shape of a horizontal layer. The arc-shaped layer is curved into an arc shape away from the horizontal layer, and the end of the arc-shaped layer is installed towards the surface of the horizontal layer.

7. An assembly according to claim 6, wherein The end of the arc-shaped layer is bifurcated into two petals, each of which is provided with a composite contact point.

8. An assembly according to claim 6, wherein The part of the end of the arc-shaped layer where the composite contact point is installed is bent into a "Z" shape towards the horizontal layer.

9. An assembly according to claim 6, wherein, The horizontal layer is bent into a "Z" shape away from the arc-shaped layer.

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