A fastener plate under stray current protection system

Abstract

The application discloses a fastener plate lower anti-stray current system, which realizes the increase of the creepage distance of the fastener system, the reduction of the surface contaminant accumulation and the prevention of the internal conductive path from being penetrated by dust, oil and water and other contaminants, thereby making the fastener system have good insulation performance during long-term use. In the application, a plate lower insulation plate with good insulation performance is arranged under the iron pad plate to realize the electrical isolation between the upper iron part of the fastener and the track bed, and the insulation coating with good insulation performance and elasticity is sprayed on the surface of the fastener to realize the filling and sealing of the gaps of the components on the upper part of the fastener, thereby preventing the decrease of the overall insulation performance of the fastener caused by long-term use. The scheme is basically consistent with the installation of the general fastener, does not increase additional processes, and will not be obviously affected by any subsequent rail adjustment, and is suitable for large-scale construction.

Description

Technical Field

[0001] This invention relates to the field of power supply and stray current prevention in track engineering, and particularly to a stray current prevention system under a fastener plate. Background Technology

[0002] In subway engineering, due to the limitations of DC power supply and the installation method where rails are usually fixed to the track bed only at the fasteners, the DC current generated during train operation will inevitably leak into the surrounding environment because the fasteners cannot be completely insulated from the ground. In particular, as the years of operation increase, the damage and pollution at the fasteners become more serious, causing the insulation performance of the fasteners themselves to deteriorate continuously, resulting in more and more current (stray current) leaking into the surrounding environment from the fasteners.

[0003] As urbanization continues, urban scale and municipal construction are also constantly expanding. This necessitates laying more infrastructure within limited urban space, such as pipelines for gas, water, and oil, as well as underground structures. These facilities contain a large amount of metal materials. Due to current leakage generated during rail transit operation, the metal materials in these structures can suffer severe electrochemical corrosion, leading to safety risks such as pipeline damage and structural instability after long-term use.

[0004] To address the aforementioned problems, this patent proposes a stray current prevention system under the fastener plate through research, resulting in a fastener stray current prevention system with simple structure and excellent insulation performance. Summary of the Invention

[0005] To address the aforementioned problems, this invention aims to provide a stray current prevention system under the fastener plate. By insulating the lower part of the fastener and sealing the gaps at the upper part, it increases the creepage distance of the fastener system, reduces the accumulation of surface contaminants, and prevents internal conductive paths from being penetrated by contaminants such as dust and oil. This results in the fastener system having good insulation performance for long-term use.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a stray current prevention system under a fastener plate, comprising a sleeper, a height adjustment pad, and a fastener iron pad, wherein rail spike bolts are simultaneously inserted between the three components for fastening, characterized in that: an insulating device is provided between the height adjustment pad and the fastener iron pad to insulate and separate the two; insulating components are provided between the sleeper and the height adjustment pad, and between the height adjustment pad and the fastener iron pad; and a deformable sealing insulating layer is sprayed at the joints of all the above components.

[0007] Preferably, the insulating device is an under-plate insulating plate that is tightly attached to the bottom surface of the fastener pad and the corresponding insulating component. The under-plate insulating plate is vertically enclosed by an insulating side plate, and the edge of the under-plate insulating plate extends outward in the circumferential direction with protruding under-plate insulating plates.

[0008] Preferably, an insulating positioning cylinder extending to a certain height to the top and bottom of the lower insulating plate is vertically disposed on the surface of the lower insulating plate that mates with the rail spike bolt.

[0009] Preferably, insulating positioning rings that are tightly fitted to the outer wall of the rail spike bolt are embedded on both the top and bottom sides of the inner wall of the insulating positioning cylinder.

[0010] Preferably, the insulating component is a bottom expansion sealing ring that is in close contact with the surface of the sleeper and the height adjustment pad, and the surface of the height adjustment pad and the fastener iron pad, and the bottom expansion sealing ring is wrapped around the outer periphery of the track spike bolt.

[0011] The beneficial effects of this invention are:

[0012] 1. In terms of installation, the system can be assembled with the fasteners as a whole, and its positioning is consistent with the fasteners. It will not change due to the adjustment of the rail position, which is convenient for large-scale use.

[0013] 2. The system is installed using rail spike bolts and fastener pads for fixing, eliminating the need for pretreatment such as grinding and degreasing of the rails, which greatly saves construction time, significantly improves construction efficiency, and facilitates large-scale use.

[0014] 3. The system is installed below the bottom surface of the rail and will not affect other operations on the rail or the inspection of rail welds during construction;

[0015] 4. The system is located below the fastener pad, does not change the contact state between the rail and the pad under the rail in the original fastener system, and will not affect the performance of the original fastener; installation and removal are relatively convenient, and it is particularly suitable for existing line renovation projects.

[0016] 5. The system has an insulating positioning cylinder surrounding the outer edge of the fastener pad in the middle of the insulating plate under the board, which increases the creepage distance of the system and can also limit the relative sliding between the two, so as to avoid excessive wear of the insulating plate under the board due to excessive sliding, thereby affecting the service life.

[0017] 6. This patent utilizes an insulating coating and an expansion sealing ring under the plate to achieve insulation and sealing of the upper and lower parts of the fastener, thereby improving the insulation performance of the track system. Attached Figure Description

[0018] Figure 1 This is an assembly structure diagram of the insulation device of the present invention.

[0019] Figure 2 For the present invention Figure 1 Partial cross-sectional view.

[0020] Figure 3 For the present invention Figure 2 Partial front view.

[0021] Figure 4 This is a cross-sectional view of the insulating plate under the board of the present invention. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] See attached document Figures 1-4 The illustrated stray current prevention system under the fastener plate includes a sleeper 10, a height adjustment pad 20, and a fastener iron pad 30, all three of which are secured together by rail spike bolts 40. Figures 1-2 As shown, an insulating device is provided between the height adjustment pad 20 and the fastener pad 30 to insulate them. Insulating components are also provided between the sleeper 10 and the height adjustment pad 20, and between the height adjustment pad 20 and the fastener pad 30. A deformable sealing insulating layer is sprayed at all the joints of these components. This insulating device, installed between the height adjustment pad 20 and the fastener pad 30, achieves electrical isolation between the fasteners and components on the upper part of the fastener pad 30 and the track bed. The insulating components further insulate and seal between the sleeper 10 and the height adjustment pad 20, and between the height adjustment pad 20 and the fastener pad 30, enhancing the sealing effect of the insulating device after separating the rail components.

[0024] The sealing and insulating layer is preferably made of an insulating coating with good insulation properties and elasticity (such as long-life room temperature vulcanizing silicone rubber insulating coating). It is sprayed onto the surface of the fastener to fill and seal the gaps between the upper components. During use, this sealing and insulating layer can adapt to the deformation of the components due to its elasticity, preventing cracks from forming at the original seal due to relative displacement caused by component deformation, thus avoiding damage to the overall seal and preventing a decline in the overall insulation performance of the fastener over long-term use. This sealing and insulating layer itself has good hydrophobic and oleophobic properties and low dust adsorption capacity, ensuring surface cleanliness under long-term use conditions.

[0025] The installation of the insulation device is basically the same as that of existing general fasteners, without adding extra procedures. It does not require high skills or physical strength from on-site construction personnel, and any subsequent adjustments to the rails will not have a significant impact on it, making it suitable for large-scale construction. Furthermore, since the system is installed under the rails, it will not affect subsequent rail flaw detection work.

[0026] Specifically, such as Figures 1-4 As shown, the insulating device is an under-plate insulating plate 1 that is tightly attached to the bottom surface of the fastener iron pad 30 and the corresponding insulating component. An insulating side plate 11 vertically surrounds the outer periphery of the under-plate insulating plate 1, and protruding under-plate insulating plates 12 extend outwards circumferentially from the edge of the under-plate insulating plate 1. Based on the insulation provided by the under-plate insulating plate 1 between the height adjustment pad 20 and the fastener iron pad 30, the overall length of the insulating side plate 11 and the protruding under-plate insulating plates 12 increases the creepage distance of the fastener system, reduces the accumulation of surface contaminants, and prevents the internal conductive path from being penetrated by contaminants such as dust and oil. This results in good insulation performance of the fastener system over long-term use, reduces stray currents leaking to the ground, and significantly reduces the electrochemical corrosion of the surrounding metal materials.

[0027] Preferably, the insulating side plate 11 can be configured as an outward inclined slope structure, which reduces the top height of the insulating side plate 11 while ensuring an effective creepage distance, thereby reducing the capacity of oil stains to accumulate on the surface of the insulating plate 1 below the plate.

[0028] To achieve a sealing effect between the under-plate insulation plate 1 and the rail spike bolt 40, such as Figures 2-3 As shown, an insulating positioning cylinder 13 is vertically installed on the surface of the under-plate insulating plate 1 that mates with the rail spike bolt 40, extending to a certain height at both the top and bottom of the under-plate insulating plate 1. Its installation, in conjunction with the rail spike bolt 40, serves to isolate contaminants from the upper surface of the fastener pad 30, preventing contaminants accumulated on the upper surface of the fastener pad 30 from moving downwards along the rail spike bolt 40 to the track bed, thus avoiding the drawback of forming a conductive path. This restricts the flow of contaminants from the surface of the under-plate insulating plate 1 to the side sleeper, achieving the purpose of increasing the system creepage distance. It also limits the relative sliding between the two and prevents contaminants such as oil, water, and dust from moving downwards and creating a conductive path. During system assembly, the sealing insulating layer is sprayed into the mating gap between the rail spike bolt 40 and the upper and lower ends of the insulating positioning cylinder 13 to achieve a sealing and insulating effect.

[0029] like Figure 4 As shown, in order to improve the assembly accuracy of the lower insulating plate 1 and the rail spike bolt 40 after mating, insulating positioning rings 2 are embedded on the top and bottom sides of the inner wall of the insulating positioning cylinder 13, closely fitting the outer wall of the rail spike bolt 40. Through the contact between the insulating positioning rings 2 and the upper and lower sides of the rail spike bolt 40, the mating accuracy between the lower insulating plate 1 and the rail spike bolt 40 is improved, achieving the positioning and assembly of the lower insulating plate 1, thereby enhancing its insulation and sealing effect.

[0030] like Figures 2-3As shown, the insulating component is a bottom expansion sealing ring 3 that is tightly attached to the surface of the sleeper 10 and the height adjustment plate 20, and to the surface of the height adjustment plate 20 and the fastener iron plate 30, and the bottom expansion sealing ring 3 is always wrapped around the outer circumference of the track spike bolt 40. Preferably, the bottom expansion sealing ring 3 is made of a material with good elasticity and water-swellable properties. Before the fastener is installed, the bottom expansion sealing ring 3 is installed in the corresponding position by means of adhesive or other methods.

[0031] The principle of this invention is as follows: during on-site construction, the expansion sealing ring 3 of the bottom plate that has not expanded is first fixed between the sleeper 10 and the surface of the height adjustment pad 20, and between the surface of the height adjustment pad 20 and the fastener iron pad 30.

[0032] When assembling the fasteners, place the fastener pad 30 on the upper surface of the lower insulating plate 1, ensuring a good fit between the insulating positioning cylinder 13 and the fastener pad 30, without interference. This prevents damage to the thin-walled structure of the insulating positioning cylinder 13 due to compression or other factors, thus compromising the overall anti-fouling capability of the lower insulating plate 1. Preferably, the lower insulating plate 1 can also be installed on the lower surface of the height adjustment pad 20.

[0033] Since the bottom expansion sealing ring 3 of the insulating plate 1 has been assembled before leaving the factory, it can be placed directly on the sleeper during the track panel assembly and fixed to the sleeper 10 by the track spike bolts 40. The pre-tightening force of the track spike bolts 40 will compress and deform the bottom expansion sealing ring 3, thereby achieving the seal between the bottom insulation plate 1 and the sleeper 10.

[0034] When it is necessary to adjust the height of the track structure and use height adjustment pads, install the bottom expansion sealing rings 3 around the corresponding track spike bolts 40 of the height adjustment pads 20 to be used in advance. The effect and principle of its use are the same as those used on the bottom insulation plate 1.

[0035] After the fasteners are fully installed, insulating coating can be sprayed onto their upper surfaces at the track-laying base or on-site. During the spraying process, special attention should be paid to the joints between the track spike bolts 40 and the elastic washers, flat washers, and iron base plates to prevent poor sealing.

[0036] The above technical solution improves the insulation performance of the insulation system structure of the anti-stray current system under the fastener plate. Its installation is determined by the position of the fastener, and it will not cause mismatch problems with the position of the fastener due to changes in the position of the rail. It can be installed during the rail panel assembly, saving on-site installation time and reducing installation difficulty. It will not significantly affect the construction efficiency of the original rail laying, making it particularly suitable for the renovation project of the existing line without affecting normal operation.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A stray current prevention system under a fastener plate, comprising a sleeper (10), a height adjustment plate (20), and a fastener iron plate (30), wherein rail spike bolts (40) are simultaneously inserted between the three components for fastening, characterized in that: An insulating device is provided between the height adjustment pad (20) and the fastener pad (30) to separate them. Insulating components are provided between the sleeper (10) and the height adjustment pad (20), and between the height adjustment pad (20) and the fastener pad (30). A deformable sealing insulating layer is sprayed at the joint of all the above components. The insulating device is an under-plate insulating plate (1) that is closely attached to the bottom surface of the fastener pad (30) and the corresponding insulating component. An insulating side plate (11) is vertically enclosed around the outer periphery of the under-plate insulating plate (1), and an over-plate insulating plate (12) extends outward along the circumferential direction at the edge of the under-plate insulating plate (1). The insulating side plate (11) is configured as an outward inclined slope structure. The insulating component is a bottom expansion sealing ring (3) that is in close contact with the surface of the sleeper (10) and the height adjustment pad (20), and the surface of the height adjustment pad (20) and the fastener pad (30).

2. The anti-stray current system under the fastener plate according to claim 1, characterized in that: An insulating positioning cylinder (13) extending to a certain height at the top and bottom of the insulating plate (1) is vertically provided on the surface of the insulating plate (1) that cooperates with the rail spike bolt (40).

3. The anti-stray current system under the fastener plate according to claim 2, characterized in that: An insulating positioning ring (2) is embedded on the top and bottom sides of the inner wall of the insulating positioning cylinder (13), which is closely attached to the outer wall of the rail spike bolt (40).

4. The anti-stray current system under the fastener plate according to claim 3, characterized in that: The expansion sealing rings (3) at the bottom of the plate are all wrapped around the outer circumference of the road spike bolts (40).

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