Cable terminal anti-fracture device

Abstract

The utility model relates to the field of cable installation, in particular to a cable terminal anti-fracture device which comprises a cable and an end cover, one end of the cable is provided with an opening, the side wall of the end cover is fixedly communicated with a connecting pipe, the inner bottom wall of the end cover is provided with a conduction assembly used for conducting current, and the conduction assembly is fixedly connected with a fixing column. The other end of the fixing column penetrates through the open hole to be in threaded connection with a locking ring, a cable guide seat is fixedly connected to the inner bottom wall of the end cover, the end, away from the hole, of the cable penetrates through the cable guide seat and extends to the outside through a connecting pipe, and a damping assembly used for reducing cable abrasion in the vibration environment is arranged on the inner side wall of the connecting pipe. According to the utility model, the fixing assembly is used to replace the traditional crimping mode, thereby fundamentally preventing the crimping part from being impacted for a long time to easily cause metal fatigue, crack generation and final fracture, and reducing the risk of grounding loop interruption.

Description

Technical Field

[0001] This utility model relates to the field of cable installation, and specifically to a cable terminal anti-breakage device. Background Technology

[0002] As a key component of the train bogie, the grounding device's core function is to stably conduct the operating current, system fault current, and lightning current generated by the car body to the axle, and then guide them to the ground via the wheel and rail. This ensures the safety of onboard personnel and the stable operation of electrical equipment, and effectively prevents electrolytic corrosion of the train bearings during operation. The continuous and stable conduction of the grounding circuit directly determines the normal output of the train's traction power and the reliable operation of the onboard electrical systems, and is an important guarantee for the overall safe operation of the train series.

[0003] In existing technologies, such as the Weidmüller SAKPE4 grounding terminal, this product is a screw-type grounding terminal with a modular design. The insulation material is a heat-resistant material with a flame-retardant rating of UL94 V-0. It is compatible with cable specifications from 0.5mm² to 6mm². The cable conductor and the terminal conductive piece are tightly crimped together by an M3 crimp screw, and then the terminal is fixed to the carbon brush holder of the grounding device using threaded fasteners, forming a low-impedance current conduction path to achieve reliable conduction of the train grounding circuit, while meeting the electromagnetic compatibility and safety protection requirements of rail transit scenarios.

[0004] However, in actual use, the conductive tabs of the Weidmüller SAKPE4 grounding terminals are connected to the cables via crimping. During train operation, continuous vibrations repeatedly act on the crimped area. Long-term vibration and impact can easily lead to metal fatigue and cracking at the crimped joint, ultimately causing the terminal to break. After the terminal breaks, the current cannot be transmitted through the terminal to grounding components such as the carbon brush holder, causing an interruption in the grounding circuit, which in turn leads to train malfunctions and seriously affects the safety and stability of train operation. Therefore, it is necessary to propose a cable terminal anti-breakage device. Utility Model Content

[0005] To address the aforementioned issues, this invention provides a cable terminal anti-breakage device, which replaces the traditional crimping method with a fixing component. This fundamentally prevents the crimped area from being subjected to long-term impact, which can easily lead to metal fatigue, cracks, and ultimately breakage, thus reducing the risk of grounding circuit interruption.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A cable terminal anti-breakage device includes a cable and an end cap. One end of the cable has an opening. A connecting pipe is fixedly connected to the side wall of the end cap. A conducting component for conducting current is provided on the inner bottom wall of the end cap. A fixing post is fixedly connected to the conducting component. A locking ring is threaded through the opening at the other end of the fixing post. A cable guide seat is fixedly connected to the inner bottom wall of the end cap. The end of the cable away from the opening passes through the cable guide seat and extends to the outside through the connecting pipe. A shock-absorbing component for reducing cable wear is provided on the inner side wall of the connecting pipe.

[0007] The technical principles of the above solution are as follows:

[0008] By drilling a hole at the end of the cable, the cable end is secured using the hole and a fixing post. A locking ring then restricts cable movement, preventing it from detaching from the fixing post. The fixing post also acts as a conductor, connecting the cable to the current path of the conductive assembly. The cable is then passed through a cable guide seat, further limiting and guiding it to reduce sway and direct it towards the connecting pipe. Inside the connecting pipe, the cable is further secured by a shock-absorbing assembly. It then extends through the connecting pipe to the external ground, connecting the end cap to the train. The conductive assembly fits against the train, thus connecting the current path between the train and the ground.

[0009] The above approach has the following beneficial effects:

[0010] 1. This utility model, through the threaded engagement of the fixing post and the locking ring, combined with the limiting guidance of the cable guide seat, forms a double fixation from the end of the cable and the extension section, effectively limiting the displacement and shaking of the cable in the vibration environment, avoiding fatigue fracture at the terminal connection caused by long-term pulling or swinging, and extending the service life of the cable.

[0011] 2. In this utility model, the shock-absorbing component inside the connecting pipe can buffer the impact force caused by vibration, and at the same time reduce the direct friction between the cable and the inner wall of the connecting pipe. It is especially suitable for high-frequency vibration scenarios such as trains, reducing problems such as insulation layer damage and decreased conductivity caused by wear, and ensuring the stable connection of the current path.

[0012] 3. In this utility model, the fixing column has the dual functions of fixing and conducting electricity, eliminating the need for additional conductive connectors. While ensuring the cable is securely fixed, it also ensures a tight fit between the cable and the conductive components, reducing the risk of poor contact. The overall structure is designed with threaded connections and through guides, making installation convenient and the connection firm, while taking into account both assembly efficiency and safety of use.

[0013] Furthermore, the conductive assembly includes several carbon brush holders, and several bases are fixedly connected to the inner bottom wall of the end cap. The top of each base is fixedly connected to a carbon brush holder, and a spring is fixedly connected to the top of each carbon brush holder. The top of one carbon brush holder is fixedly connected to the end of the fixing post away from the locking ring. Carbon brushes are detachably connected to the top of each spring. The carbon brushes are electrically connected to the carbon brush holders, and the carbon brush holders are electrically connected to each other.

[0014] Beneficial effects: The spring can always provide elastic pressure to the carbon brush, ensuring that the carbon brush and the train contact surface are in close contact, avoiding the interruption of conductivity caused by contact gaps under vibration environment; the parallel design of multiple carbon brush holders forms a redundant current path, so that the overall conductivity is not affected when a single carbon brush wears or fails, improving the reliability of the device operation; the detachable design of the carbon brush facilitates later maintenance and replacement, reducing the cost of use.

[0015] Furthermore, each carbon brush has a limiting frame fitted and slidably fitted on its outer sidewall. Each limiting frame is fixedly connected to a fixing rod, and the other end of each fixing rod is fixedly connected to the inner sidewall of the end cap.

[0016] Beneficial effects: The limiting frame is fixed to the end cap by the fixing rod, which can restrict the movement direction of the carbon brush, prevent the carbon brush from shifting or tilting due to vibration, ensure the contact accuracy between the carbon brush and the contact surface, prevent the carbon brush from falling off, and ensure conductivity stability and structural safety.

[0017] Furthermore, a washer is provided between the locking ring and the cable.

[0018] Beneficial effects: The washer can fill the gap between the locking ring and the cable surface, increase the contact area and disperse the locking pressure of the locking ring, avoid excessive local pressure from damaging the cable, and prevent the locking ring from loosening under vibration, further improving the cable fixing firmness.

[0019] Furthermore, an anti-slip silicone layer is fixedly connected to the top of the end cap.

[0020] Beneficial effects: The anti-slip silicone layer increases the friction between the top of the end cap and the contact surface of the train, allowing it to firmly adhere to the train surface during installation. This prevents the end cap from sliding or shifting due to force or vibration during assembly, ensuring precise alignment between the end cap and the train. At the same time, the elasticity of the silicone material can fill the tiny gaps in the contact surface, improving the connection seal and reducing the risk of loosening in vibration environments, thus balancing ease of installation and connection stability.

[0021] Furthermore, the outer wall of the end cap is coated with an insulating layer.

[0022] Beneficial effects: The insulating layer on the outer wall of the end cover forms full circumferential protection, preventing accidental electrical conduction between the device and other metal parts of the train, and preventing current leakage or short circuit; at the same time, it can resist external environmental corrosion, extend the service life of the end cover, and adapt to the complex environment of train outdoor operation.

[0023] Furthermore, the contact surface between the cable guide and the cable is coated with a lubricating layer.

[0024] Beneficial effects: The lubricating layer can reduce the coefficient of friction between the cable and the cable guide seat, reduce cable wear during vibration, and protect the cable insulation layer; at the same time, it makes the slight movement of the cable within a limited range smoother, avoids local stress concentration caused by jamming, and further reduces the risk of breakage.

[0025] Furthermore, the outer wall of the end cap is engraved with anti-slip texture.

[0026] Beneficial effects: The anti-slip texture increases the friction between the end cap and the installation tools or hands, making it easier to tighten the connection between the end cap and the train during installation and preventing tools from slipping and affecting assembly efficiency; at the same time, it is easier to apply force during later maintenance and disassembly, improving maintenance convenience.

[0027] Furthermore, the shock absorption assembly includes a first guide rail and a second guide rail. A first slider is slidably fitted on the inner wall of the first guide rail, and a second slider is slidably fitted on the inner wall of the second guide rail. The top of the second slider is fixedly connected to the bottom of the first slider. A spring-loaded shaft is fixedly connected to the ends of both the first and second guide rails. The other end of each spring-loaded shaft is fixedly connected to the inner wall of the connecting tube. A cable passes through the first slider and the second slider and is fixedly connected to both of them.

[0028] Beneficial effects: The elastic reset function of the rebound shaft allows the cable to quickly return to its initial position after vibration, which can buffer the vibration impact force on the cable and reduce fatigue damage caused by long-term shaking; at the same time, the slider is fixed to the cable, further limiting the cable displacement and avoiding excessive wear or pulling of the cable in the connecting pipe.

[0029] Furthermore, a rubber ring is fixedly connected to the end of the connecting tube away from the end cap.

[0030] Beneficial effects: The rubber ring can reduce the impact on the connecting pipe when the first and second guide rails swing, thereby improving the service life of the device and reducing wear. Attached Figure Description

[0031] Figure 1 This is a top axonometric view of an embodiment of the cable terminal anti-breakage device of this utility model.

[0032] Figure 2 for Figure 1 Enlarged view of section A.

[0033] Figure 3 This is a cross-sectional view of an embodiment of the cable terminal anti-breakage device of this utility model.

[0034] Figure 4 This is an isometric view of an embodiment of the cable terminal anti-breakage device of this utility model.

[0035] Figure 5 This is a bottom-view axonometric drawing of an embodiment of the cable terminal anti-breakage device of this utility model.

[0036] The reference numerals in the accompanying drawings of the instruction manual include: 1. End cap; 2. Connecting tube; 3. Base; 4. Brush holder; 5. Carbon brush; 6. Limiting frame; 7. Fixing rod; 8. Spring; 9. Cable; 10. Cable guide seat; 11. Fixing post; 12. Locking ring; 13. First guide rail; 14. Second guide rail; 15. First slider; 16. Second slider; 17. Springback shaft. Detailed Implementation

[0037] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0038] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] The following detailed description illustrates the specific implementation method:

[0041] Example 1:

[0042] As attached Figure 1As shown in Figure 2: A cable terminal anti-breakage device includes a cable 9 and an end cap 1. One end of the cable 9 has an opening. A connecting pipe 2 is fixedly connected to the side wall of the end cap 1. A conductive component for conducting current is provided on the inner bottom wall of the end cap 1. A fixing post 11 is welded to the conductive component. The other end of the fixing post 11 passes through the opening and is threadedly connected to a locking ring 12. A cable guide seat 10 is bolted to the inner bottom wall of the end cap 1. The end of the cable 9 away from the opening passes through the cable guide seat 10 and extends to the outside through the connecting pipe 2. A shock-absorbing component for reducing wear on the cable 9 is provided on the inner side wall of the connecting pipe 2.

[0043] Specifically, during installation, first align the opening with the fixing post 11 and pass it through, so that the fixing post 11 passes through the end of the cable 9. Then, tighten the locking ring 12 onto the end of the fixing post 11 away from the conductive component. The end of the cable 9 is firmly fixed by the threaded engagement between the locking ring 12 and the fixing post 11. Then, pass the end of the cable 9 away from the hole through the cable guide seat 10 and the connecting pipe 2 in sequence. The cable guide seat 10 forms a limiting guide for the cable 9, so that the cable 9 extends along the direction of the connecting pipe 2 to the outside and is grounded. Finally, fix the end cover 1 to the corresponding installation position on the train to complete the overall assembly.

[0044] As shown in Figures 1 and 3, the conductive assembly includes several carbon brush holders 4. Several bases 3 are bolted to the inner bottom wall of the end cap 1. The top of each base 3 is bolted to the carbon brush holder 4. A spring 8 is welded to the top of each carbon brush holder 4. The top of one of the carbon brush holders 4 is welded to the end of the fixing post 11 away from the locking ring 12. A carbon brush 5 is detachably connected to the top of each spring 8. The carbon brush 5 is electrically connected to the carbon brush holder 4. The carbon brush holders 4 are electrically connected to each other.

[0045] Specifically, the base 3 provides stable support for the carbon brush holder 4. After the fixing post 11 is fixed to one of the carbon brush holders 4, the cable 9 forms a conductive path with the carbon brush holder 4 through the fixing post 11. The remaining carbon brush holders 4 form a parallel circuit through mutual electrical connection. The spring 8 is always in a compressed state, providing continuous elastic pressure to the carbon brush 5, ensuring that the carbon brush 5 is in close contact with the train contact surface and avoiding contact gaps caused by vibration. When a single carbon brush 5 is worn or malfunctions, the remaining carbon brushes 5 can conduct current normally, ensuring continuity of conductivity. When the carbon brush 5 is severely worn, it can be directly disassembled and replaced without the need for an overall disassembly device.

[0046] As shown in Figure 1, the outer side wall of the carbon brush 5 is fitted with a limiting frame 6 that slides and fits. The limiting frame 6 is integrally formed with a fixing rod 7, and the other end of the fixing rod 7 is bolted to the inner side wall of the end cover 1.

[0047] Specifically, the fixing rod 7 firmly fixes the limiting frame 6 to the inside of the end cover 1. The carbon brush 5 is embedded in the limiting frame 6 and can slide up and down along the inner side wall of the limiting frame 6. The limiting frame 6 strictly restricts the movement direction of the carbon brush 5, allowing the carbon brush 5 to only move in the direction of contact with the train, so as to prevent the carbon brush 5 from shifting horizontally or tilting due to train vibration, ensuring that the carbon brush 5 is always in precise contact with the train contact surface, and preventing the carbon brush 5 from falling off the carbon brush holder 4, thus ensuring conductivity stability and structural safety.

[0048] A gasket is provided between the locking ring 12 and the cable 9. An anti-slip silicone layer is bonded to the top of the end cap 1. An insulating layer is coated on the outer wall of the end cap 1. A lubricating layer is coated on the contact surface between the cable guide seat 10 and the cable 9. Anti-slip textures are engraved on the outer wall of the end cap 1.

[0049] Specifically, the washer is attached between the locking ring 12 and the surface of the cable 9, filling the gap between them while dispersing the locking pressure of the locking ring 12, so as to avoid excessive local pressure that could damage the insulation layer of the cable 9.

[0050] When installing end cap 1, the anti-slip silicone layer on top adheres tightly to the train mounting surface, increasing the friction of the contact surface and preventing end cap 1 from sliding or shifting during assembly. It also fills tiny gaps to improve connection sealing. The insulating layer on the outer wall of end cap 1 provides full-circumferential protection, preventing accidental electrical conduction with other metal parts of the train and resisting external corrosion. The lubricating layer on the contact surface between the cable guide seat 10 and the cable 9 reduces the coefficient of friction, allowing for smoother slight movement of the cable 9 during vibration, reducing wear and stress concentration. The anti-slip texture on the outer wall of end cap 1 increases friction with installation tools or hands, facilitating tightening of end cap 1 during installation and simplifying disassembly for later maintenance.

[0051] This utility model addresses the core issues of easy breakage and unstable conductivity of cable 9 terminals under train vibration through a multi-component collaborative design. On one hand, the threaded engagement of the fixing post 11 and the locking ring 12, combined with the limiting and guiding function of the cable guide seat 10, forms a double fixation from the end and extension of cable 9, effectively limiting the displacement and swaying of cable 9 during vibration and preventing fatigue fracture at the terminal connection due to long-term tension. On the other hand, the conductive component provides continuous elastic pressure to the carbon brush 5 through the spring 8, ensuring a tight fit between the carbon brush 5 and the train contact surface, in conjunction with the multi-brush holder. The parallel design ensures a stable current path, while the limiting frame 6 further prevents the carbon brush 5 from shifting and falling off, improving conductivity reliability. In addition, the anti-slip silicone layer on the top of the end cap 1 ensures precise alignment with the train during installation. The outer wall insulation layer and the gaskets at the locking ring 12 respectively enhance insulation protection and cable 9 protection. The lubricating layer of the cable guide seat 10 reduces cable 9 wear, and the anti-slip texture of the end cap 1 improves ease of operation. Ultimately, this achieves stable terminal connection of cable 9, stable conductivity, and comprehensive protection, adapting to the complex operating environment of trains, extending the service life of cable 9, and ensuring safe current transmission.

[0052] Example 2:

[0053] As attached Figure 4 As shown in Figure 5, the difference from Embodiment 1 is that the shock-absorbing assembly includes a first guide rail 13 and a second guide rail 14. A first slider 15 is slidably fitted onto the inner wall of the first guide rail 13, and a second slider 16 is slidably fitted onto the inner wall of the second guide rail 14. The top of the second slider 16 is integrally formed with the bottom of the first slider 15. A spring-loaded shaft 17 is bolted to the ends of both the first guide rail 13 and the second guide rail 14. The other end of the spring-loaded shaft 17 is bolted to the inner wall of the connecting pipe 2. The cable 9 passes through the first slider 15 and the second slider 16 and is snapped into both. A rubber ring is adhered to the end of the connecting pipe 2 away from the end cap 1.

[0054] Specifically, the first guide rail 13 provides a vertical sliding path for the first slider 15, and the second guide rail 14 provides a horizontal sliding path for the second slider 16. The two work together to allow the cable 9, which is fixed to the first slider 15 and the second slider 16, to move 360° on the horizontal plane. When the train generates multi-directional vibrations, if the vibration is transmitted vertically, the cable 9 drives the first slider 15 to slide along the vertical first guide rail 13. If the vibration is transmitted horizontally, the cable 9 drives the second slider 16 to slide along the horizontal second guide rail 14. This synchronously buffers the impact of vibrations in different directions and prevents the cable 9 from being locally stretched due to unidirectional movement restrictions. The rebound shaft 17 undergoes elastic deformation as the cable 9 is displaced. After the vibration weakens, it uses its own restoring force to drive the first slider 15, the second slider 16, and the cable 9 back to their initial positions, preventing fatigue damage caused by the long-term shaking of the cable 9 inside the connecting pipe 2. At the same time, the rubber ring at the end of the connecting pipe 2 is fitted on the outside of the cable 9, which can reduce the impact on the connecting pipe 2 when the first guide rail 13 and the second guide rail 14 swing.

[0055] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A cable terminal anti-breakage device, characterized in that, Includes a cable (9) and an end cap (1). One end of the cable (9) has an opening. A connecting pipe (2) is fixedly connected to the side wall of the end cap (1). A conductive component for conducting current is provided on the inner bottom wall of the end cap (1). A fixed post (11) is fixedly connected to the conductive component. A locking ring (12) is threaded through the opening at the other end of the fixed post (11). A cable guide seat (10) is fixedly connected to the inner bottom wall of the end cap (1). The end of the cable (9) that is far from the opening passes through the cable guide seat (10) and extends to the outside through the connecting pipe (2). A shock-absorbing component for reducing wear on the cable (9) is provided on the inner side wall of the connecting pipe (2).

2. The cable terminal anti-breakage device according to claim 1, characterized in that, The conductive assembly includes several carbon brush holders (4), and several bases (3) are fixedly connected to the inner bottom wall of the end cap (1). The top of each base (3) is fixedly connected to the carbon brush holder (4), and a spring (8) is fixedly connected to the top of each carbon brush holder (4). The top of one of the carbon brush holders (4) is fixedly connected to the end of the fixing post (11) away from the locking ring (12). A carbon brush (5) is detachably connected to the top of each spring (8). The carbon brush (5) is electrically connected to the carbon brush holder (4), and the carbon brush holders (4) are electrically connected to each other.

3. The cable terminal anti-breakage device according to claim 2, characterized in that, The outer side wall of the carbon brush (5) is fitted with a sliding fit of a limiting frame (6), and the limiting frame (6) is fixedly connected with a fixing rod (7). The other end of the fixing rod (7) is fixedly connected to the inner side wall of the end cap (1).

4. The cable terminal anti-breakage device according to claim 3, characterized in that, A washer is provided between the locking ring (12) and the cable (9).

5. The cable terminal anti-breakage device according to claim 4, characterized in that, The top of the end cap (1) is fixedly connected with an anti-slip silicone layer.

6. The cable terminal anti-breakage device according to claim 5, characterized in that, The outer wall of the end cap (1) is coated with an insulating layer.

7. The cable terminal anti-breakage device according to claim 6, characterized in that, The contact surface between the cable guide (10) and the cable (9) is coated with a lubricating layer.

8. The cable terminal anti-breakage device according to claim 7, characterized in that, The outer wall of the end cap (1) is engraved with anti-slip texture.

9. The cable terminal anti-breakage device according to claim 8, characterized in that, The shock absorption assembly includes a first guide rail (13) and a second guide rail (14). The inner wall of the first guide rail (13) is slidably fitted with a first slider (15), and the inner wall of the second guide rail (14) is slidably fitted with a second slider (16). The top of the second slider (16) is fixedly connected to the bottom of the first slider (15). The ends of the first guide rail (13) and the second guide rail (14) are fixedly connected to the spring-loaded shaft (17), and the other end of the spring-loaded shaft (17) is fixedly connected to the inner wall of the connecting tube (2). The cable (9) passes through the first slider (15) and the second slider (16) and is fixedly connected to both of them.

10. The cable terminal anti-breakage device according to claim 9, characterized in that, A rubber ring is fixedly connected to the end of the connecting tube (2) away from the end cap (1).

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