Railway vehicle grounding band

Abstract

The application relates to the rail transit technical field, in particular to a rail vehicle grounding strip. The rail vehicle grounding strip comprises a fixed section, a curved section and a contact section; the fixed section comprises a first conductive copper plate, a second conductive copper plate and a metal wire layer arranged between the first conductive copper plate and the second conductive copper plate; the curved section comprises an elastic insulating main body and a metal wire layer filled in the elastic insulating main body; the elastic insulating main body of the curved section is connected with the first conductive copper plate and the second conductive copper plate; the contact section comprises an elastic insulating main body and a metal wire layer filled in the elastic insulating main body; the elastic insulating main body of the contact section is connected with the elastic insulating main body of the curved section; the metal wire layer of the contact section is connected with the metal wire layer of the curved section; and at one end far from the curved section, the metal wire layer of the contact section is exposed outside the elastic insulating main body of the contact section. The rail vehicle grounding strip has good conductive reliability, wear resistance and fatigue resistance.

Description

Technical Field

[0001] This application relates to the field of rail transit technology, and in particular to a grounding strip for rail vehicles. Background Technology

[0002] In railless rail transit systems such as straddle-type monorails and maglev trains, there is no electrical connection path between the vehicle and the track provided by traditional steel rails. During vehicle operation, the onboard electrical equipment, such as the high-voltage power supply system and traction system, continuously operates, generating leakage currents to varying degrees. Simultaneously, static electricity accumulates due to friction between the vehicle body and the air. If these charges cannot be conducted to the ground in a timely manner, they will form a potential on the vehicle body, potentially affecting the normal operation of the onboard electrical equipment and posing a risk of electric shock to passengers when they board or alight, endangering their safety.

[0003] To address this issue, existing technologies typically involve installing grounding devices on the platform, which connect to the vehicle's grounding terminal when the vehicle enters the station, forming a temporary grounding path. Common grounding devices include rigid contact rails, grounding carbon brushes, and grounding copper strips. In actual operation, grounding devices need to withstand hundreds of bending cycles, mechanical wear, and current surges daily, placing extremely high demands on the conductivity, toughness, wear resistance, and fatigue resistance of the materials. However, existing solutions have significant limitations: rigid contact rails are complex to install and prone to mechanical interference; carbon brushes wear quickly, require frequent replacement, and have poor conductivity stability; while ordinary copper strips have good conductivity, their fatigue performance is poor, and they are prone to breakage after repeated bending.

[0004] Therefore, there is an urgent need for a grounding strip that combines excellent conductivity, mechanical toughness, and fatigue resistance to meet the safety grounding requirements of high-density, high-reliability urban rail transit operations. Utility Model Content

[0005] This utility model solves at least to some extent the above-mentioned technical problems and provides a grounding strip for rail vehicles.

[0006] Embodiments of this disclosure provide a grounding strip for a rail vehicle, comprising: Fixed section: a grounding component connecting the rail vehicle, the fixed section including a first conductive copper plate, a second conductive copper plate, and a fixed section metal wire layer disposed between the first conductive copper plate and the second conductive copper plate; Bending section: includes a bending section elastic insulating body and a bending section metal wire layer filled in the bending section elastic insulating body; the bending section metal wire layer is connected to the fixed section metal wire layer, and the elastic body is connected to the first conductive copper plate and the second conductive copper plate; Contact segment: includes a contact segment elastic insulating body and a contact segment metal wire layer filled inside the contact segment elastic insulating body; the contact segment elastic insulating body is connected to the bending segment elastic insulating body, the contact segment metal wire layer is connected to the bending segment metal wire layer, and at one end away from the bending segment, the contact segment metal wire layer is exposed outside the contact segment elastic insulating body.

[0007] The technical solution provided in this application has at least the following beneficial effects: Through the segmented structural design, the grounding strip achieves fixed installation, flexible bending and reliable contact functions. The structure is reasonable and adapts to the state changes when vehicles enter and leave the station, ensuring the reliability and safety of the grounding process.

[0008] In other embodiments of this application, the bent section further includes a marking hole, which is located on the outside of the metal wire layer of the contact section.

[0009] The technical solution provided in this application has at least the following beneficial effects: the wear condition of the grounding strip can be observed intuitively through the marking holes, realizing visualized wear management, facilitating the formulation of scientific replacement plans, and improving maintenance efficiency.

[0010] In other embodiments of this application, the metal wires in the fixed section metal wire layer, the bent section metal wire layer, and the contact section metal wire layer are all wavy.

[0011] The technical solution provided in this application has at least the following beneficial effects: the wavy metal wire design significantly improves the bending fatigue life of the grounding strip, enhances its deformation capacity, and avoids the problem of breakage caused by repeated bending.

[0012] In other embodiments of this application, the head of the contact segment is tapered at the end furthest from the curved segment.

[0013] The technical solution provided in this application has at least the following beneficial effects: the conical head design reduces mechanical resistance during contact, facilitates the contact process between the grounding strip and the grounding grid, improves the reliability and stability of the contact, and reduces wear.

[0014] In other embodiments of this application, the fixing section further includes a fixing through hole through which a fixing member passes to fix the fixing section and the grounding component of the rail vehicle.

[0015] The technical solution provided in this application brings at least the following benefits: through the cooperation of the fixing through hole and the fixing part, a reliable connection between the grounding strip and the vehicle grounding terminal is realized, ensuring the stability of the electrical connection and the reliability of the mechanical fixation.

[0016] In other embodiments of this application, the fixing through hole passes through the fixing section of the metal wire layer.

[0017] The technical solution provided in this application has at least the following beneficial effects: it ensures that the fixing component can reliably fix the grounding strip, and it also realizes the electrical connection between the fixing component and the metal wire, thereby improving the power conduction performance of the grounding strip.

[0018] In other embodiments of this application, the flexible insulating body of the bending section and the flexible insulating body of the contact section are made of rubber.

[0019] The technical solution provided in this application has at least the following beneficial effects: the rubber material has good elasticity and aging resistance, which can provide stable contact force and effectively protect the internal metal wire, thus extending the service life of the grounding strip.

[0020] In other embodiments of this application, the areas of the first conductive copper plate and the second conductive copper plate are larger than the area of ​​the fixed section metal wire layer, and the gaps between the first conductive copper plate and the second conductive copper plate in the areas not covered by the fixed section metal wire layer are filled with insulating material.

[0021] The technical solution provided in this application has at least the following beneficial effects: it ensures sufficient conductive contact area, avoids the risk of short circuit between conductive copper plates, and improves the safety and reliability of the grounding strip.

[0022] In other embodiments of this application, the insulating material is rubber.

[0023] The technical solution provided in this application brings at least the following beneficial effects: rubber not only has good insulation properties, but also integrates well with the overall structure of the grounding strip, providing additional structural strength and environmental protection.

[0024] In other embodiments of this application, the fixed section of the metal wire layer is welded to the first conductive copper plate and the second conductive copper plate.

[0025] The technical solution provided in this application has at least the following beneficial effects: the welded connection ensures a low-resistance connection between the metal wire and the conductive copper plate, improves the current conduction efficiency, and guarantees the conductivity reliability of the grounding strip.

[0026] Compared with the prior art, the grounding strip for rail vehicles provided in this application has at least the following beneficial effects: 1) By using a brazing process to firmly connect the metal wire to the conductive copper plate, extremely low contact resistance and a stable and efficient current path are ensured. This solves the problem of decreased conductivity caused by loosening and oxidation in traditional crimping or mechanical connection methods, and improves conductivity reliability. 2) The core conductor uses a corrugated metal wire, which has a more uniform stress distribution during repeated bending, avoiding metal fatigue fracture caused by stress concentration. This allows the grounding strip to withstand far more bending cycles than ordinary flat conductors, thus extending its service life many times over. 3) Rubber is used as the insulation and encapsulation body. Its excellent elasticity, aging resistance and weather resistance protect the internal metal structure from corrosion, oxidation and mechanical damage. At the same time, the appropriate contact force provided by the rubber ensures the stability of the grounding contact and adapts to various complex operating environments. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art 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 effort.

[0028] Figure 1 This is a schematic diagram of the grounding strip structure in this embodiment; Figure 2 This is a cross-sectional view of the grounding strip fixing section in this embodiment; Figure 3 This is a cross-sectional view of the bent section of the grounding strip in this embodiment; Figure 4 This is a cross-sectional view of the grounding strip in this embodiment; Figure 5 This is a schematic diagram of the grounding strip working principle in this embodiment; Figure 6 This is a perspective view of the grounding strip in this embodiment; Figure 7 This is a schematic diagram of the grounding strip installation structure in this embodiment; In the above figures: 1-1. Fixed section; 1-2. Bending section; 1-3. Contact section; 1-4. Marking hole; 1-5. Head of contact section; 1-6. Fixed through hole; 2-1, First conductive copper plate; 2-2, Second conductive copper plate; 2-3, Fixed section metal wire layer; 2-4, Insulator; 3-1. Elastic insulation body of the bending section; 3-2. Metal wire layer of the bending section; 4-1. Elastic insulation body of the contact section; 4-2. Metal wire layer of the contact section; 5. Bolts; 6. Vehicle grounding components. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0030] The prefixes such as "first" and "second" used in this application embodiment are merely for distinguishing different descriptive objects and do not limit the position, order, priority, quantity, or content of the described objects. The use of ordinal numbers and other prefixes used to distinguish descriptive objects in this application embodiment does not constitute a limitation on the described objects. The description of the described objects is given in the claims or the context of the embodiments, and should not constitute unnecessary restrictions due to the use of such prefixes. Furthermore, in the description of this embodiment, unless otherwise stated, "multiple" means two or more.

[0031] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B; the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone.

[0032] In the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0033] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0034] Railless straddle-type monorails and maglev vehicles, lacking the natural grounding path of rails, require specialized grounding devices to release leakage currents from onboard high-voltage equipment and static electricity accumulated through friction within the vehicle body upon entering the station. However, existing grounding devices generally suffer from poor conductivity reliability, short mechanical lifespan, and inconvenient maintenance, making it difficult to meet the demands of high-density, high-reliability operations. In particular, grounding devices need to withstand hundreds of bending cycles, mechanical wear, and current surges daily, placing extremely high demands on the conductivity, mechanical properties, and durability of the materials used.

[0035] This application provides a grounding strip for a rail vehicle, such as... Figure 1 The grounding strip of the rail vehicle shown adopts a segmented design, including a fixed section 1-1, a curved section 1-2, and a contact section 1-3.

[0036] like Figure 7 As shown, fixed section 1-1 connects to vehicle grounding component 6. (As indicated...) Figure 2 , Figure 4 As shown, the fixed section 1-1 includes a first conductive copper plate 2-1, a second conductive copper plate 2-2, and a fixed section metal wire layer 2-3 disposed between the first conductive copper plate 2-1 and the second conductive copper plate 2-2.

[0037] like Figure 3 , Figure 4 As shown, the bending section 1-2 includes a bending section elastic insulating body 3-1 and a bending section metal wire layer 3-2 filled in the bending section elastic insulating body; the bending section metal wire layer 3-2 is connected to the fixed section metal wire layer 2-3, and the bending section elastic insulating body 3-1 is connected to the first conductive copper plate 2-1 and the second conductive copper plate 2-2.

[0038] like Figure 4 As shown, the contact segment 1-3 includes a contact segment elastic insulating body 4-1 and a contact segment metal wire layer 4-2 filled inside the contact segment elastic insulating body 4-1; the contact segment elastic insulating body 4-1 is connected to the bending segment elastic insulating body 3-1, the contact segment metal wire layer 4-2 is connected to the bending segment metal wire layer 3-2, and at the end away from the bending segment 1-2, the contact segment metal wire 4-2 is exposed outside the contact segment elastic insulating body 4-1.

[0039] like Figure 5As shown, when a vehicle enters the station, the platform grounding rail gradually approaches the vehicle. The metal wire layer 4-2 of contact section 1-3, which is furthest from the curved section 1-2, first contacts the grounding rail. Under the inertia of the vehicle, the curved section 1-2 begins to bend and deform, and the grounding strip changes from a straight state to a curved state, maintaining stable contact between contact section 1-2 and the grounding rail. At this time, static electricity and leakage current from the vehicle body are introduced into the grounding rail through the path of the first conductive copper plate 2-1, the second conductive copper plate 2-2, the fixed section metal wire layer 2-3, the curved section metal wire layer 3-2, and the contact section metal wire layer 4-2. When the vehicle leaves the station, the curved section gradually returns to a straight state due to the elastic restoring force of the rubber.

[0040] The structure of the vehicle track grounding strip disclosed in this embodiment ensures a smooth and reliable grounding process. The first conductive copper plate 2-1 and the second conductive copper plate 2-2 of the fixed section 1-1 ensure a reliable electrical connection with the vehicle grounding component 6. The corrugated metal wire and the elastic rubber body provide excellent fatigue resistance and bending life.

[0041] Furthermore, in this embodiment, since the grounding device needs to withstand hundreds of bending cycles and mechanical wear every day in actual operation, the wear of the grounding strip is very severe in such a harsh application environment. Wear to a certain extent will affect the grounding effect, necessitating effective wear monitoring methods. For example... Figure 6 As shown, the bent section also includes marking holes 1-4. The marking holes 1-4 are positioned on the outside of the metal wire layer 4-2 of the contact section, avoiding the metal wire layer. For example, a marking hole 1-4 with a diameter of 3mm is provided 70mm from the head of the contact section, and the marking hole 1-4 is 3mm from the edge of the metal wire layer 4-2. Therefore, during routine maintenance, maintenance personnel should periodically check the distance between the marking hole and the head. If the distance is less than 35mm, the grounding strip needs to be replaced.

[0042] In other embodiments of this application, the grounding strip needs to withstand composite bending stress when entering a curved platform. For example... Figure 6As shown, the wires in the fixed section metal wire layer 2-3, the bent section metal wire layer 3-2, and the contact section metal wire layer 4-2 are all designed with a wavy shape. Straight wires are prone to breakage after frequent bending, affecting grounding reliability. The fixed section metal wire layer 2-3, the bent section metal wire layer 3-2, and the contact section metal wire layer 4-2 are all designed with a wavy shape. For example, the fixed section metal wire layer 2-3, the bent section metal wire layer 3-2, and the contact section metal wire layer 4-2 all adopt a wavy structure with a peak height of 2mm and a wave pitch of 4mm. In the bent section 1-2, the bent section metal wire layer 3-2 is arranged in three layers, with the peaks and troughs of the wires in each layer staggered. The wavy wires absorb bending energy through waveform deformation, avoiding stress concentration. When the grounding strip bends, the waveform of each wire in the metal wire layer undergoes elastic deformation, rather than simply relying on the material's ductility, greatly improving the deformation capacity of the vehicle track grounding strip and better adapting to harsh application environments.

[0043] In other embodiments of this application, when the grounding strip contacts the grounding grid, it is necessary to reduce contact resistance, avoid mechanical interference, and guide the contact process to improve contact reliability. For example... Figure 6 As shown, the head 1-5 of contact section 1-3 is conical, and the thickness of the elastic insulating body 4-1 of the contact section gradually decreases on the side away from the bending section 1-2 until the head 1-5 of contact section 1-3 becomes a triangular structure. The conical head design reduces mechanical resistance during contact, reduces contact impact, facilitates the guidance of the contact process between the grounding strip and the grounding grid, improves the reliability and stability of the contact, and reduces wear.

[0044] In other embodiments of this application, because the grounding strip operates in harsh environments, requiring frequent bending and impacts, it needs to be reliably fixed to the vehicle grounding component 6 to ensure the stability of the electrical connection. For example... Figure 1 As shown, the fixed section 1-1 also includes a fixed through hole 1-6, such as... Figure 7 As shown, the fastener passes through the fixing through hole 1-6 to secure the fixing section 1-1 and the vehicle grounding component 6. For example, the fastener can be a bolt 5. The cooperation between the fixing through hole 1-6 and the fastener achieves a reliable connection between the grounding strip and the vehicle grounding terminal, ensuring the stability of the electrical connection and the reliability of the mechanical fixation.

[0045] To achieve a stable connection structure, multiple fixing through holes 1-6 can be provided, and the fixing through holes 1-6 are arranged symmetrically on both sides. (Reference) Figure 6 In this embodiment, there are four fixing through holes 1-6, with two on each side. (See reference) Figure 7The vehicle grounding component 6 has corresponding connection holes of a number and arrangement that match the fixing through holes 1-6, allowing them to be aligned with the fixing through holes 1-6. Bolts 5 pass through the connection holes and fixing through holes 1-6 to secure the vehicle grounding component 6 and the grounding strip.

[0046] Furthermore, such as Figure 6 As shown, the fixed through hole 1-6 passes through the fixed section metal wire layer 2-3, which on the one hand ensures the reliability of the mechanical connection between the fixed section 1-1 and the vehicle grounding component 6, and on the other hand, the vehicle grounding component 6 directly contacts the fixed section metal wire layer 2-3 through the fixed through hole 1-6, which increases the current path between the vehicle grounding component 6 and the grounding strip, and ensures a reliable electrical connection between the grounding strip and the vehicle grounding component 6.

[0047] Because grounding strips need to withstand frequent pressure and bending during practical applications, the insulating body of the grounding strip needs to have good elasticity, wear resistance and aging resistance to protect the internal metal wires and provide appropriate contact force.

[0048] In other embodiments of this application, the flexible insulating body 3-1 in the bending section and the flexible insulating body 4-1 in the contact section are made of rubber. Rubber material has good elasticity and aging resistance, providing stable contact force and effectively protecting the internal metal wires, thus extending the service life of the grounding strip.

[0049] In other embodiments of this application, such as Figure 2 As shown, the areas of the first conductive copper plate 2-1 and the second conductive copper plate 2-2 are larger than the area of ​​the fixed section metal wire layer 2-3. The gaps between the first conductive copper plate 2-1 and the second conductive copper plate 2-2 in the uncovered areas of the fixed section metal wire layer 2-3 are filled with insulating material 2-4. After the insulating material 2-4 and the conductive copper plate are vulcanized together, a more integrated composite structure is formed. On the one hand, this structure can better withstand and disperse mechanical stresses such as vibration and impact, improving the connection reliability and long-term stability of the grounding strip in the vehicle operating environment. On the other hand, the insulating material 2-4 seals the edge of the fixed section metal wire layer 2-3, preventing moisture, dust and other contaminants from entering the interior of the fixed section 1-1 from the side, avoiding corrosion and contamination of the fixed section metal wire layer 2-3, thus maintaining excellent conductivity over a long period of time.

[0050] Furthermore, the insulation 2-4 filling the gap between the first conductive copper plate 2-1 and the second conductive copper plate 2-2 in the uncovered area of ​​the fixed section metal wire layer 2-3 is made of rubber. On the one hand, the rubber forms a strong chemical bond and mechanical interlock with the surface of the conductive copper plate, preventing delamination or detachment under vibration and ensuring the long-term integrity of the structure; on the other hand, the rubber material itself has good elasticity, aging resistance, weather resistance and electrical insulation. Its elasticity can buffer the installation force and vibration during operation, protecting the internal metal wires; its insulation ensures that there will be no leakage even in high humidity or polluted environments.

[0051] In other embodiments of this application, the fixed section metal wire layer 2-3 and the first conductive copper plate 2-1 and the second conductive copper plate 2-2 are brazed. The brazing process firmly connects the fixed section metal wire layer 2-3 to the first conductive copper plate 2-1 and the second conductive copper plate 2-2, ensuring extremely low contact resistance and a stable and efficient current path. This solves the problem of decreased conductivity caused by loosening and oxidation in traditional crimping or mechanical connection methods, ensuring the conductivity reliability of the grounding strip.

[0052] The above embodiments are only used to illustrate the technical solutions of this application and not to limit them; although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this application or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of this application, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in this application.

Claims

1. A grounding strip for rail vehicles, characterized in that, include: Fixed section: a grounding component connecting the rail vehicle, the fixed section including a first conductive copper plate, a second conductive copper plate, and a fixed section metal wire layer disposed between the first conductive copper plate and the second conductive copper plate; Bending section: includes a bending section elastic insulating body and a bending section metal wire layer filled in the bending section elastic insulating body; the bending section metal wire layer is connected to the fixed section metal wire layer, and the bending section elastic insulating body is connected to the first conductive copper plate and the second conductive copper plate; Contact segment: includes a contact segment elastic insulating body and a contact segment metal wire layer filled inside the contact segment elastic insulating body; the contact segment elastic insulating body is connected to the bending segment elastic insulating body, the contact segment metal wire layer is connected to the bending segment metal wire layer, and at one end away from the bending segment, the contact segment metal wire layer is exposed outside the contact segment elastic insulating body.

2. The grounding strip for rail vehicles according to claim 1, characterized in that, The curved section also includes a marking hole, which is located on the outside of the metal wire layer of the contact section.

3. The grounding strip for rail vehicles according to claim 1, characterized in that, The metal wires in the fixed section metal wire layer, the bent section metal wire layer, and the contact section metal wire layer are all wavy.

4. The grounding strip for rail vehicles according to claim 1, characterized in that, At the end furthest from the curved section, the head of the contact section is tapered.

5. The grounding strip for rail vehicles according to claim 1, characterized in that, The fixed section also includes a fixed through hole through which a fixing member passes to fix the fixed section and the grounding component of the rail vehicle.

6. The grounding strip for rail vehicles according to claim 5, characterized in that, The fixing through hole passes through the fixing section of the metal wire layer.

7. The grounding strip for rail vehicles according to claim 1, characterized in that, The flexible insulation body of the bending section and the flexible insulation body of the contact section are made of rubber.

8. The grounding strip for rail vehicles according to claim 1, characterized in that, The areas of the first conductive copper plate and the second conductive copper plate are larger than the area of ​​the fixed section metal wire layer, and the gaps between the first conductive copper plate and the second conductive copper plate in the areas not covered by the fixed section metal wire layer are filled with insulating material.

9. The grounding strip for rail vehicles according to claim 8, characterized in that, The insulation material is made of rubber.

10. The grounding strip for rail vehicles according to claim 1, characterized in that, The fixed section of the metal wire layer is welded to the first conductive copper plate and the second conductive copper plate.

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