Self-cleaning antifouling steel rail capable of eliminating stray current

Abstract

The utility model discloses a self-cleaning antifouling steel rail capable of eliminating stray current, which belongs to the technical field of steel rail traffic, comprises a rail head, a rail web and a rail foot, and is characterized in that high-insulation and high-wear-resistance coatings are arranged on the surfaces of the rail web and the rail foot of the steel rail, and self-cleaning coatings are arranged on the surfaces of the high-insulation and high-wear-resistance coatings. And therefore, coating structures with high insulating property, high wear resistance and waterproof and antifouling properties are formed on the surfaces of the rail waist and the rail foot of the steel rail. The self-cleaning antifouling steel rail for eliminating the stray current is simple in structure, insulation, wear resistance and waterproof and antifouling effects are guaranteed, the steel rail can be guaranteed to meet long-term effective protection of the stray current in different humid pollution environments, and the self-cleaning antifouling steel rail has high cost performance.

Description

Technical Field

[0001] The utility model belongs to the technical field of rail transportation, and in particular relates to a self-cleaning and anti-fouling rail capable of eliminating stray current. Background Art

[0002] Urban rail transit, such as subways, light rails, trams, and new rail transit systems, mainly use DC traction power supply, which feeds power to the train through the contact network (rail), and the running rails return the power to the traction substation. Due to the external environment, maintenance methods, construction technology, and materials, the rails and the roadbed structure cannot be completely insulated. In this way, when the traction current flows through the rails, it cannot all flow back to the negative pole of the traction substation from the rails. A small part of it leaks from the location where the rails are poorly insulated from the ground to the roadbed and the surrounding soil, forming stray current. The presence of stray current will cause electrochemical corrosion to the rails themselves and the public facilities, pipelines, and buildings around the rails, reducing the service life of the rails, buried pipelines, and buildings. Therefore, it is necessary to take protective measures to avoid the formation of stray currents.

[0003] At present, there are two main forms of stray current protection. One is to set insulating materials on the outside of the rails to wrap the rails. Although this method can effectively increase the insulation resistance between the rails and surrounding structures, gaps will be formed in the insulating materials during installation and use. Under actual operating conditions and in humid environments, the insulation performance of the rail system cannot be maintained, and the stray current problem of the rail system cannot be fundamentally solved. In addition, the protection system of this method is complex, the construction is difficult, and the protection cost is high. The other is to apply an insulating coating on the outside of the rails to achieve stray current protection. This protection method enables the rails to have insulation and wear resistance, but the existing insulating coating does not have self-cleaning and anti-fouling properties. Its insulation performance will be greatly reduced in a humid and oily environment. Therefore, for areas with severe pollution, the durability of the insulation performance of the existing insulating coating cannot be guaranteed. Utility Model Content

[0004] In response to one or more of the above defects or improvement needs in the prior art, the utility model provides a self-cleaning and anti-fouling rail that eliminates stray currents, which can improve the durability of the insulating performance of the insulating coating and ensure that the rails can meet the long-term and effective protection against stray currents in different humid and polluted environments.

[0005] To achieve the above-mentioned purpose, the utility model provides a self-cleaning and anti-fouling steel rail for eliminating stray current, the steel rail comprising a rail head, a rail waist and a rail foot, the surfaces of the rail waist and the rail foot are provided with a coating structure, the coating structure consists of a high-insulation and high-wear-resistant coating and a self-cleaning coating, the high-insulation and high-wear-resistant coating is coated on the surface of the steel rail, and the self-cleaning coating is coated on the surface of the high-insulation and high-wear-resistant coating.

[0006] As a further improvement of the present invention, the rail head comprises a rail head top surface, a rail head bottom surface and a rail head side surface, and the rail head bottom surface and the rail head side surface are provided with the coating structure.

[0007] As a further improvement of the present invention, the total thickness of the high-insulation and high-wear-resistant coating is not less than 120 μm.

[0008] As a further improvement of the utility model, the high-insulation and high-wear-resistant coating is provided with at least two layers, and the thickness of each layer is between 30 μm and 150 μm.

[0009] As a further improvement of the present invention, the thickness of the self-cleaning coating is between 20 μm and 80 μm.

[0010] As a further improvement of the present invention, the total thickness of the coating structure is not greater than 1000 μm.

[0011] As a further improvement of the present invention, the volume resistivity of the high insulation and high wear-resistant coating is not less than 1×10 14 Ω·cm;

[0012] and / or,

[0013] The water contact angle of the self-cleaning coating is not less than 150°, and the water rolling angle is not more than 10°.

[0014] As a further improvement of the utility model, the high-insulation and high-wear-resistant coating is one or more of epoxy resin coating, polyurethane coating, polysiloxane coating, and fluorosilicone modified resin coating.

[0015] As a further improvement of the utility model, the self-cleaning antifouling coating is an epoxy resin coating or a polyurethane coating or a polysiloxane coating or a fluorosilicone modified resin coating.

[0016] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0017] In general, compared with the prior art, the above technical solutions conceived by the utility model have the following beneficial effects:

[0018] (1) The self-cleaning and anti-fouling rail for eliminating stray current of the utility model can effectively prevent the traction current from leaking out from the side and bottom of the rail by arranging a high-insulation and high-wear-resistant coating on the surface of the rail waist and rail foot, eliminate the stray current between the rail and the surrounding environment, and reduce or eliminate the wear of the coating, thereby extending the service life of the coating. Furthermore, a self-cleaning coating is arranged on the surface of the high-insulation and high-wear-resistant coating, which can be waterproof and anti-fouling, and can effectively prevent the high-insulation and high-wear-resistant coating from being polluted by sewage in a humid environment, resulting in a reduction in insulation performance, thereby ensuring that the rail meets the long-term effective protection of stray current in different humid and polluted environments.

[0019] (2) The self-cleaning and anti-fouling rail for eliminating stray current of the utility model can ensure that each layer of the high-insulation and high-wear-resistant coating has insulating and wear-resistant properties and can be evenly coated on the surface of the structure by setting the high-insulation and high-wear-resistant coating into at least two layers, and the thickness of each layer is between 30 μm and 150 μm; and the volume resistivity of the high-insulation and high-wear-resistant coating is limited to not less than 1×10 14 Ω·cm and the total thickness is not less than 120μm to ensure that it provides sufficient insulation and wear resistance for the rail.

[0020] (3) The utility model is a self-cleaning and anti-fouling rail that eliminates stray current. The water contact angle of the self-cleaning coating is limited to not less than 150°, and the water rolling angle is not more than 10°, and the thickness of the self-cleaning coating is between 20μm and 80μm. While meeting the anti-fouling and waterproof performance of the coating, it can ensure that the rail can meet the long-term effective protection of stray current in different humid and polluted environments, and can also improve its economy.

[0021] (4) The self-cleaning and anti-fouling rail for eliminating stray current of the utility model has a simple structure, and has guaranteed insulation, wear resistance, waterproof and anti-fouling effects. It can ensure that the rail can meet the long-term effective protection of stray current in different humid and polluted environments, and also has a high cost performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a schematic diagram of the structure of a self-cleaning and anti-fouling rail for eliminating stray current in an embodiment of the utility model;

[0024] Figure 2 It is a structural schematic diagram of a self-cleaning and anti-fouling rail for eliminating stray current in another embodiment of the utility model.

[0025] In all the drawings, the same figure numbers represent the same technical features, specifically: 1. rail head; 11. top surface of rail head; 12. bottom surface of rail head; 13. side surface of rail head; 2. rail waist; 3. rail foot; 4. high insulation and high wear-resistant coating; 5. self-cleaning coating. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] Example:

[0032] See also Figure 1-2 The self-cleaning and anti-fouling steel rail for eliminating stray current in the preferred embodiment of the utility model comprises a rail head 1, a rail waist 2 and a rail foot 3. The surfaces of the rail waist 2 and the rail foot 3 are provided with a coating structure.

[0033] Specifically, the coating structure consists of a high-insulation and high-wear-resistant coating 4 and a self-cleaning coating 5, wherein the high-insulation and high-wear-resistant coating 4 is directly coated on the surface of the rail, i.e., the surface of the rail waist 2 and the rail foot 3, and the self-cleaning coating 5 is coated on the surface of the high-insulation and high-wear-resistant coating 4.

[0034] In a preferred embodiment, the high-insulation and high-wear-resistant coating 4 and the self-cleaning coating 5 are preferably continuously coated on the corresponding structure to form a uniform coating structure. In this embodiment, the high-insulation and high-wear-resistant coating 4 coated on the surface of the rail has reliable insulation performance on the one hand, which can effectively prevent the traction current from leaking out from the side and bottom of the rail and eliminate the stray current between the rail and the surrounding environment. On the other hand, it has wear resistance, which can reduce or eliminate coating wear and extend the service life of the coating. Furthermore, the self-cleaning coating 5 coated on the surface of the high-insulation and high-wear-resistant coating 4 can be waterproof and anti-fouling, and can effectively prevent the high-insulation and high-wear-resistant coating 4 from being polluted by sewage in a humid environment, resulting in reduced insulation performance, and the dust and impurities on the surface of the self-cleaning coating 5 can also be easily cleaned and taken away by water and air flow, which can ensure that the rail meets the long-term effective protection of stray current in different humid and polluted environments.

[0035] Furthermore, the rail head 1 comprises a rail head top surface 11, a rail head side surface 13 and a rail head bottom surface 12, and the rail head side surface 13 and the rail head bottom surface 12 are preferably also provided with a coating structure.

[0036] In actual settings, the top surface 11 of the rail head serves as the rolling contact surface of the wheel and the area adjacent to the contact surface, and does not need to be coated with a coating structure. If the top surface 11 of the rail head is coated with a coating structure, on the one hand, the coating structure will affect the contact between the wheel and the top surface 11 of the rail head, and on the other hand, the coating structure will also hinder the current from flowing back from the rail to the traction substation.

[0037] Preferably, the high insulation and high wear-resistant coating 4 is selected from existing materials with a volume resistivity not less than 1×10 14 Ω·cm to ensure its insulation performance.

[0038] Preferably, the total thickness of the high-insulation and high-wear-resistant coating 4 is not less than 120 μm to ensure sufficient insulation performance and wear resistance. For example, when the high-insulation and high-wear-resistant coating 4 has only one layer, the single-layer coating thickness is greater than or equal to 120 μm; when the high-insulation and high-wear-resistant coating 4 has multiple layers, the total coating thickness of the multiple layers is not less than 120 μm.

[0039] Furthermore, the high-insulation and high-wear-resistant coating 4 has at least two layers, and the thickness of each layer is between 30 μm and 150 μm. At this time, the total thickness of the two or more layers of high-insulation and high-wear-resistant coating 4 is not less than 120 μm.

[0040] In this preferred embodiment, since it takes a certain amount of time to coat the coating each time before the next coating can be applied, when the thickness of each layer of the high-insulation and high-wear-resistant coating 4 is less than 30 μm, its insulation and wear-resistant effect is limited, and multiple coatings are required to meet the insulation and wear-resistant requirements, resulting in an extended construction period and increased construction costs; when the thickness of each layer of the high-insulation and high-wear-resistant coating 4 is greater than 150 μm, the coating thickness is too large and it is difficult to coat it evenly on the surface of the structure, resulting in inconsistent insulation and wear-resistant properties on the surface of the structure, affecting the service life of the coating. Therefore, it is more appropriate to set the thickness of each layer of the high-insulation and high-wear-resistant coating 4 between 30 μm and 150 μm.

[0041] In a specific embodiment, two layers of high insulation and high wear-resistant coating 4 are uniformly coated on the surface of the rail, wherein the first layer has a thickness of 60 μm, the second layer has a thickness of 60 μm, and the total thickness of the two layers of high insulation and high wear-resistant coating 4 is 120 μm. Figure 2 shown.

[0042] Furthermore, when the high-insulation and high-wear-resistant coating 4 is set as a single layer, it is one of epoxy resin coating, polyurethane coating, polysiloxane coating, and fluorosilicone modified resin coating; when the high-insulation and high-wear-resistant coating 4 is set as multiple layers, each layer is one of epoxy resin coating, polyurethane coating, polysiloxane coating, and fluorosilicone modified resin coating.

[0043] In a specific embodiment, the high-insulation and high-wear-resistant coating 4 is provided with two layers, the inner layer may be an epoxy resin coating, and the outer layer may be a fluorosilicone modified resin coating, or both layers may be polysiloxane coatings.

[0044] Preferably, the water contact angle of the self-cleaning coating 5 is not less than 150°, and the water rolling angle is not more than 10°. It is a super-hydrophobic material with good waterproof, anti-corrosion and anti-adhesion properties.

[0045] Furthermore, the thickness of the self-cleaning coating 5 is between 20 μm and 80 μm.

[0046] In this embodiment, the self-cleaning coating 5 is mainly used for waterproofing and anti-fouling, and does not need to be set too thick. Too thick a coating will consume more coating materials and reduce economic efficiency. Too thin a coating will make it difficult to form a complete coating structure. Therefore, it is more appropriate to set the thickness of the self-cleaning coating 5 between 20μm and 80μm.

[0047] Preferably, the self-cleaning coating 5 may be coated with a single layer or multiple layers, without any specific limitation.

[0048] Preferably, the self-cleaning coating 5 is an epoxy resin coating, a polyurethane coating, a polysiloxane coating, or a fluorine-silicon modified resin coating.

[0049] Specifically, the self-cleaning coating 5 may be made of the same coating material as the high-insulation and high-wear-resistant coating 4, or may be made of different coating materials.

[0050] Furthermore, the total thickness of the coating structure is not greater than 1000 μm, that is, the thickness of all high-insulation and high-wear-resistant coatings 4 plus the thickness of all self-cleaning coatings 5 ​​is not greater than 1000 μm. When the total thickness of the coating structure exceeds 1000 μm, it will affect the installation between the rail and the fastener.

[0051] Further preferably, the total thickness of the coating structure does not exceed 400 μm, which can simultaneously meet the functionality and economy requirements of the coating structure.

[0052] Specifically, the coating process of the above coating structure includes:

[0053] (1) Cleaning of rail surface;

[0054] In a preferred embodiment, the rail surface cleaning treatment preferably adopts a mechanical rust removal form, such as sandblasting. After the cleaning treatment, the cleanliness reaches Sa3 level and the roughness is 40-100 μm. The sandblasting sand material is preferably angular steel sand. The angular steel sand is not only hard, but also its angular structure is more conducive to forming irregular impact pits on the rail surface, which can significantly improve the interlocking effect and bonding strength of the coating.

[0055] In another preferred embodiment, the rail surface cleaning treatment can also be carried out by grinding and cleaning with a power tool, and after the cleaning treatment, the cleanliness level reaches St3 level.

[0056] (2) High-insulation and high-wear-resistant coating 4 "coating-hardening" process: The first layer of high-insulation and high-wear-resistant coating 4 is evenly coated on the surface of the cleaned steel rail waist 2 and rail foot 3 by spraying (or scraping, rolling, dipping), and the surface is left to dry; then the second layer of high-insulation and high-wear-resistant coating 4 is coated on the surface of the cleaned steel rail waist 2 and rail foot 3, and the surface is left to dry.

[0057] In a preferred embodiment, one or more layers of high-insulation and high-wear-resistant coatings 4 are coated according to the above-mentioned procedure and wait for drying.

[0058] In a preferred embodiment, the coating area of ​​each layer of high-insulation and high-wear-resistant coating 4 also includes the rail head side surface 13 and the rail head bottom surface 12 .

[0059] (3) Self-cleaning coating 5 "coating-hardening" process: The self-cleaning coating 5 is evenly coated on the cleaned rail waist 2 and rail foot 3 by spraying (or scraping, rolling, dipping), and then the surface is left to dry.

[0060] In a preferred embodiment, the coating area of ​​the self-cleaning coating 5 also includes the rail head side surface 13 and the rail head bottom surface 12 .

[0061] The coating process is simple and efficient, and the insulation, wear resistance, waterproof and anti-fouling effects are guaranteed. It avoids traditional insulating blocks and sheath components and complex on-site installation, greatly reducing the cost of track insulation materials and installation costs.

[0062] The self-cleaning and anti-fouling rail for eliminating stray current in the utility model can effectively prevent the traction current from leaking out from the side and bottom of the rail by arranging a high-insulation and high-wear-resistant coating 4 on the surface of the rail waist 2 and the rail foot 3 of the rail, eliminate the stray current between the rail and the surrounding environment, and can also reduce or eliminate the coating wear and extend the service life of the coating; further, a self-cleaning coating 5 is arranged on the surface of the high-insulation and high-wear-resistant coating 4, which can be waterproof and anti-fouling, and can effectively prevent the high-insulation and high-wear-resistant coating 4 from being polluted by sewage in a humid environment and causing the insulation performance to decrease, thereby ensuring that the rail meets the long-term effective protection of stray current in different humid and polluted environments.

[0063] Through comparative calculation, under the condition of achieving the same protection effect and the same protection time, the manufacturing cost of the utility model can be reduced by more than 20%; and under the same manufacturing cost, the life of the coating structure designed by the utility model can be extended by 3-5 times, achieving good economic and social benefits.

[0064] It is easy for those skilled in the art to understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-cleaning and anti-fouling rail for eliminating stray current, the rail comprising a rail head, a rail waist and a rail foot, characterized in that: The surfaces of the rail waist and rail foot are provided with a coating structure, which consists of a high-insulation and high-wear-resistant coating and a self-cleaning coating. The high-insulation and high-wear-resistant coating is coated on the surface of the rail, and the self-cleaning coating is coated on the surface of the high-insulation and high-wear-resistant coating.

2. The self-cleaning and anti-fouling rail for eliminating stray current according to claim 1, characterized in that: The rail head comprises a rail head top surface, a rail head bottom surface and a rail head side surface, and the rail head bottom surface and the rail head side surface are provided with the coating structure.

3. The self-cleaning and anti-fouling rail for eliminating stray current according to claim 1, characterized in that: The total thickness of the high-insulation and high-wear-resistant coating is not less than 120 μm.

4. The self-cleaning and anti-fouling rail for eliminating stray current according to claim 3, characterized in that: The high-insulation and high-wear-resistant coating is provided with at least two layers, and the thickness of each layer is between 30 μm and 150 μm.

5. The self-cleaning and anti-fouling rail for eliminating stray current according to claim 4, characterized in that: The thickness of the self-cleaning coating is between 20 μm and 80 μm.

6. The self-cleaning and anti-fouling rail for eliminating stray current according to claim 5, characterized in that: The total thickness of the coating structure is no more than 1000 μm.

7. The self-cleaning and anti-fouling rail for eliminating stray current according to any one of claims 1 to 6, characterized in that: The volume resistivity of the high insulation and high wear-resistant coating is not less than 1×10 14 Ω·cm; and / or, The water contact angle of the self-cleaning coating is not less than 150°, and the water rolling angle is not more than 10°.

8. The self-cleaning and anti-fouling rail for eliminating stray current according to claim 7, characterized in that: When the high-insulation and high-wear-resistant coating is provided as a layer, it is one of epoxy resin coating, polyurethane coating, polysiloxane coating, and fluorosilicone modified resin coating; When the high-insulation and high-wear-resistant coating is provided as multiple layers, each layer is one of epoxy resin coating, polyurethane coating, polysiloxane coating and fluorosilicone modified resin coating.

9. The self-cleaning and anti-fouling rail for eliminating stray current according to claim 7, characterized in that: The self-cleaning coating is an epoxy resin coating, a polyurethane coating, a polysiloxane coating, or a fluorine-silicon modified resin coating.

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