Rail transit comprehensive protection b1 grade flame-retardant cable

Abstract

The application discloses a rail transit comprehensive protection B1-grade flame-retardant cable and belongs to the cable technical field.The rail transit comprehensive protection B1-grade flame-retardant cable comprises a plurality of circumferentially and symmetrically arranged core bodies, a plurality of limit blocks symmetrically arranged on the outer sides of the core bodies, and a plurality of limit blocks symmetrically arranged on the outer sides of the core bodies, wherein the limit blocks are arranged in groups of four, and the limit blocks are of the same shape structure.The woven layer and the flexible protrusions are arranged to bend the cable, the buffer layer and the hexagonal buffer grooves are arranged to buffer the vibration, the cable can adapt to different bending angles, the fracture or damage caused by the excessively large rigidity of the cable is avoided, the buffer layer and the hexagonal buffer grooves can be elastically contracted and deformed to absorb and relieve the vibration from the train, the cable does not directly bear all the vibration impacts, and the cable aging and damage caused by the vibration are reduced.

Description

Technical Field

[0001] This invention belongs to the field of cable technology, specifically relating to a comprehensive protective B1-grade flame-retardant cable for rail transit. Background Technology

[0002] The B1-grade flame-retardant cable for rail transit is a high-performance cable specifically designed for rail transit systems. It possesses excellent flame-retardant properties, slowing the spread of flames and reducing the release of toxic gases in the event of a fire, thus ensuring the safety of passengers and staff. During operation, rail transit systems face a high risk of fire due to prolonged power supply and the use of numerous electrical devices. The B1-grade flame-retardant cable, conforming to national standards, effectively prevents the spread of fire, slowing the occurrence and spread of fire, thereby reducing the threat of fire to personnel and equipment. Rail transit systems typically include several critical electrical devices, such as signaling systems and power supply systems. The B1-grade flame-retardant cable ensures that these systems maintain stable operation for an extended period even in extreme fire conditions, preventing equipment failure and ensuring normal train operation.

[0003] Existing Class B1 flame-retardant integrated protection cables for rail transit are often installed in tunnels. During cable laying, specific bending radius requirements must be followed; otherwise, cable damage or performance degradation may occur. However, space constraints in tunnels make controlling the bending radius more difficult, easily leading to uneven cable stress and increasing the risk of failure. Furthermore, tunnels are frequently subjected to vibrations from subway trains, which can cause cable fatigue, especially under high-frequency vibrations. This can cause micro-cracks to appear in the conductors or insulation layers of the cable, which may propagate over time, affecting the long-term stability and safety of the cable. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a comprehensive protection B1-level flame-retardant cable for rail transit.

[0005] The technical solution adopted to solve the above technical problems is: a comprehensive protection B1-level flame-retardant cable for rail transit, including a number of cores arranged in a circumferentially symmetrical manner, and a core protective sleeve is sleeved on the outside of the cores. A number of limiting blocks arranged in a mirror symmetrical manner are arranged on the outside of the number of cores, and the number of limiting blocks are grouped into groups of four, and the number of limiting blocks are arranged in the same shape and structure.

[0006] The four limiting blocks are arranged in a circular structure, and an inner groove is opened through the middle of the four limiting blocks. At the same time, a semi-core groove is opened through the connection between each pair of the four limiting blocks. The core and the core protective sleeve are located in the semi-core groove of the limiting block, and the two limiting blocks limit the core and the core protective sleeve. The outer side of the four limiting blocks is provided with a groove, and a disassembly and assembly component is provided in the groove of the limiting block.

[0007] The above technical solution enables the cable to stretch and bend appropriately when subjected to external force, reducing stress concentration caused by vehicle vibration or track deformation, extending the cable's service life, and effectively dispersing vibrations from the train. Its geometry helps to distribute vibration energy evenly, reducing excessive local stress, ensuring uniform stress on the cable surface, and avoiding local damage.

[0008] Furthermore, the assembly / disassembly component includes a semi-arc plate, and a rubber rope is rotatably connected to one end of the semi-arc plate. The rubber rope is made of elastic, non-slip rubber material. A folding plate is rotatably connected to the end of the rubber rope away from the semi-arc plate, and the folding plate is arranged in a V-shape.

[0009] Furthermore, the folding plate is set at an angle to the rubber rope at one end, and the two sides of the semi-arc plate away from the rubber rope are rotatably connected to connecting rods, and the other end of the connecting rods is rotatably connected to the middle of the folding plate. At the same time, the semi-arc plate and the rubber rope limit the position of the limiting block.

[0010] Through the above technical solution, the rail transit cable will expand or contract due to temperature changes during operation. It can effectively absorb the expansion and contraction caused by temperature changes, avoid the stress caused by temperature difference, and thus reduce the risk of cable breakage or damage.

[0011] Furthermore, a reinforcing layer is provided inside the bending block of the limiting block, and the reinforcing layer is connected to the limiting block by glue. At the same time, four concave strips with a cross-shaped structure are provided on the outer wall of the reinforcing layer. The reinforcing layer is made of synthetic fiber material, and several second heat dissipation holes are opened through the concave strips on the outer wall of the reinforcing layer in a linear and equidistant manner.

[0012] Through the above technical solutions, in rail transit systems, cables are often affected by vibrations during vehicle operation. Braided layers and flexible bumps can help reduce the direct transmission of these vibrations to the cables, avoid long-term damage from frequent vibrations, and reduce the risk of wear, aging, and cable breakage.

[0013] Furthermore, several symmetrically arranged arc-shaped grooves are provided on both sides of the reinforcing layer, and the arc-shaped grooves are connected to the second heat dissipation hole. The core protective sleeve and the core are located in the concave strip on the outer wall of the reinforcing layer, and the core protective sleeve is connected to the reinforcing layer by adhesive.

[0014] Furthermore, a flame-retardant layer is connected to the outer side of the reinforcing layer and the core protective sleeve by adhesive, and the flame-retardant layer is located between the two sets of limiting blocks. The flame-retardant layer is made of halogen-free environmentally friendly flame-retardant material. At the same time, several heat dissipation holes No. 1 are symmetrically distributed in a circle on the outer wall of the flame-retardant layer. The No. 1 heat dissipation hole is on the same straight line as the No. 2 heat dissipation hole in the concave strip of the core protective sleeve and the reinforcing layer.

[0015] Through the above technical solutions, the hexagonal buffer groove not only helps to reduce the direct impact of external vibration, but also optimizes the absorption and dispersion of vibration through its geometry, thereby enhancing the cable's resistance to vibration generated during subway train operation. This design can effectively stabilize the internal structure of the cable, especially in frequent vibration environments, maintaining the integrity and stability of the cable and ensuring that the cable's performance will not degrade due to vibration during long-term use.

[0016] Furthermore, a buffer layer is provided on the outside of the flame-retardant layer and the limiting block. The buffer layer is made of polyurethane and is connected to the flame-retardant layer and the limiting block by adhesive. The buffer layer has several buffer grooves through it, and the buffer grooves are arranged in a hexagonal structure.

[0017] Furthermore, a bending block is sleeved on the outer side of the buffer layer, and an outer protective sleeve is fixedly connected between each pair of the bending blocks. The bending block includes several woven layers and flexible protrusions. The woven layers and flexible protrusions are alternately arranged and fixedly connected to each other. The flexible protrusions are made of flexible flame-retardant rubber. Meanwhile, a movable plate is fixedly connected to the woven layers on both sides of the buffer layer. Several mounting grooves distributed in a circular pattern are opened through the corners of the movable plate.

[0018] By incorporating a buffer layer and a hexagonal buffer groove into the design, the B1-level flame retardant properties ensure that even if a fire occurs when the cable is subjected to external vibration or impact, the spread of fire can be effectively slowed down, thus increasing the safety of the cable.

[0019] The beneficial effects of this invention are as follows:

[0020] This invention, by incorporating a braided layer and flexible protrusions, allows workers to directly move the cable during installation. The braided layer rotates towards the flexible protrusions, compressing the braided layer. Simultaneously, the arc-shaped grooves within the reinforcing layer cause the internal components of the cable to bend synchronously. This bending generates stress, especially at large bends, which could potentially damage the cable's insulation or break the internal conductors. This invention effectively disperses stress at the bends, preventing stress concentration and thus extending the cable's service life.

[0021] This invention incorporates a buffer layer and a hexagonal buffer groove. When a subway train passes over the cable, the buffer groove of the buffer layer undergoes elastic contraction and deformation, thus buffering the vibration generated by the subway train. The hexagonal buffer groove design provides a more uniform force distribution. Under the action of external forces, the buffer layer can evenly disperse vibration and impact forces, reduce local stress, and prevent structural damage to a certain part of the cable due to excessive stress. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a partial structural schematic diagram of the present invention;

[0024] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure;

[0025] Figure 4 This is a schematic diagram of the connection between the buffer layer and the limiting block of the present invention;

[0026] Figure 5 This is a schematic diagram of the connection between the limiting block and the flame-retardant layer of the present invention;

[0027] Figure 6 This is a schematic diagram of the connection between the reinforcing layer and the limiting block of the present invention;

[0028] Figure 7 This is a schematic diagram of the limiting block structure of the present invention;

[0029] Figure 8 This is a first-view structural diagram of the disassembly and assembly components of the present invention;

[0030] Figure 9 This is a second-view structural diagram of the disassembly and assembly components of the present invention.

[0031] Reference numerals: 1. Outer protective sleeve; 2. Bending block; 3. Buffer layer; 4. Limiting block; 5. Semi-core groove; 6. Core protective sleeve; 7. Core; 8. Reinforcing layer; 9. Arc groove; 10. No. 1 heat dissipation hole; 11. Flame retardant layer; 12. Groove; 13. Disassembly and assembly assembly; 14. Buffer groove; 15. Semi-arc plate; 16. Connecting rod; 17. Folding plate; 18. Rubber rope; 19. No. 2 heat dissipation hole; 20. Inner groove; 21. Braided layer; 22. Flexible protrusion; 23. Moving plate; 24. Mounting groove. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0033] like Figures 1-2 This embodiment illustrates a Class B1 flame-retardant integrated protection cable for rail transit, comprising several cores 7 arranged symmetrically in a circle, with a core protective sleeve 6 covering the outer portion of each core 7. Several mirror-symmetrical limiting blocks 4 are arranged on the outer sides of each core 7, with four limiting blocks 4 grouped together. The limiting blocks 4 are of the same shape and structure, forming a circular structure. A reinforcing layer 8 is provided within the bending block 2 of each limiting block 4, enabling moderate expansion and contraction and bending when the cable is subjected to external force, reducing the impact of vehicle-induced bending. Stress concentration caused by body vibration or track deformation extends the service life of the cable. At the same time, it effectively disperses the vibration from the train. Its geometry helps to distribute the vibration energy evenly, reduce local excessive stress, ensure uniform stress on the cable surface, and avoid local damage. The reinforcing layer 8 and the limiting block 4 are connected by glue. The outer wall of the reinforcing layer 8 is provided with four concave strips arranged in a cross shape. The reinforcing layer 8 is made of synthetic fiber material. Several circumferentially symmetrical arc grooves 9 are opened through both sides of the reinforcing layer 8. The arc grooves 9 are connected to the second heat dissipation hole 19.

[0034] like Figures 2-6As shown, the core protective sleeve 6 and the core 7 are located within the concave strip on the outer wall of the reinforcing layer 8, and the core protective sleeve 6 is connected to the reinforcing layer 8 by adhesive. Several second-order heat dissipation holes 19 are linearly and equidistantly arranged through the concave strip on the outer wall of the reinforcing layer 8. A flame-retardant layer 11 is connected to the outside of the reinforcing layer 8 and the core protective sleeve 6 by adhesive. A buffer layer 3 is sleeved on the outside of the flame-retardant layer 11 and the limiting block 4. The design incorporates a buffer layer 3 and a hexagonal buffer groove 14. At the same time, the B1-level flame-retardant characteristics ensure that even if a fire occurs when the cable is subjected to external vibration or impact, it can effectively delay the spread of fire and increase the safety of the cable. A bending block 2 is sleeved on the outside of the buffer layer 3. Several bending blocks 2 are fixedly connected to the outer protective sleeve 1 in pairs. The bending block 2 includes several braided layers 21 and flexible protrusions 22. The layers are arranged alternately, and the braided layer 21 and the flexible protrusion 22 are connected and fixed. The flexible protrusion 22 is made of flexible flame-retardant rubber. At the same time, the braided layer 21 on both sides of the buffer layer 3 is fixedly connected to the movable plate 23. In the rail transit system, the cable is often affected by the vibration during the vehicle's operation. The braided layer 21 and the flexible protrusion 22 can help reduce the direct transmission of these vibrations to the cable, avoid the cable being damaged by frequent vibrations for a long time, and reduce the risk of wear, aging and cable breakage. Several mounting grooves 24 are provided through the corners of the movable plate 23 in a circumferentially distributed manner. The buffer layer 3 is made of polyurethane. At the same time, the buffer layer 3 is connected to the flame-retardant layer 11 and the limiting block 4 by glue. Several buffer grooves 14 are provided through the buffer layer 3, and the buffer grooves 14 are arranged in a hexagonal structure. The flame-retardant layer 11 is located between the two sets of limiting blocks 4.

[0035] like Figures 1-9As shown, the flame-retardant layer 11 is made of halogen-free environmentally friendly flame-retardant material. Several symmetrically distributed heat dissipation holes 10 are provided on the outer wall of the flame-retardant layer 11. These holes 10 are aligned with the second heat dissipation holes 19 within the concave strip of the core protective sleeve 6 and the reinforcing layer 8. An inner groove 20 is provided through the center of each of the four limiting blocks 4. A semi-core groove 5 is provided at the connection point between each pair of limiting blocks 4. The core 7 and the core protective sleeve 6 are located within the semi-core groove 5 of the limiting blocks 4, and the two limiting blocks 4 limit the movement of the core 7 and the core protective sleeve 6. During operation, the rail transit cable will expand or contract due to temperature changes. This design effectively absorbs the expansion and contraction caused by temperature changes, avoiding stress caused by temperature differences and reducing the risk of cable breakage or damage. Grooves 12 are provided on the outer sides of the four limiting blocks 4, and a disassembly assembly 13 is provided within the grooves 12 of the limiting blocks 4. The disassembly assembly 13 includes a semi-arc plate 1. 5. A rubber rope 18 is rotatably connected to one end of the semi-arc plate 15. The rubber rope 18 is made of elastic, non-slip rubber. A folding plate 17 is rotatably connected to the end of the rubber rope 18 away from the semi-arc plate 15. The end of the folding plate 17 facing the rubber rope 18 is set at an angle to the rubber rope 18. Connecting rods 16 are rotatably connected to both sides of the end of the semi-arc plate 15 away from the rubber rope 18. The hexagonal buffer groove 14 not only helps to reduce the direct impact of external vibration, but also optimizes the absorption and dispersion effect of vibration through its geometry, thereby enhancing the cable's resistance to vibration generated during subway train operation. This design can effectively stabilize the internal structure of the cable, especially in frequent vibration environments, maintaining the integrity and stability of the cable, and ensuring that the cable's performance will not degrade due to vibration during long-term use. The other end of the connecting rod 16 is rotatably connected to the middle of the folding plate 17. At the same time, the semi-arc plate 15 and the rubber rope 18 limit the limit block 4, and the folding plate 17 is set in a V-shaped structure.

[0036] The working principle of this embodiment is as follows: During production, a core protective sleeve 6 is wrapped around the outer wall of the core 7. The core protective sleeve 6 is made of rubber insulating material and is wrapped by thermoplasticizing to ensure that the core protective sleeve 6 is fully and tightly wrapped around the outside of the core protective sleeve 6. Then, glue is applied to the outside of the core protective sleeve 6, and the four thermoplasticized cores 7 are placed into the concave strips of the reinforcing layer 8 and connected by glue. At the same time, glue is applied to the outer wall of the reinforcing layer 8. The cores 7 and the reinforcing layer 8 are then placed into the flame retardant layer 11, and the first heat dissipation hole 10, the second heat dissipation hole 19 and the core 7 are aligned on the same straight line. Then, the four limiting blocks 4 of the two sets are assembled. A circular frame is placed at both ends of the flame-retardant layer 11. Then, the core protective sleeves 6 and 7 are placed into the half-core grooves 5 of the four limiting blocks 4, so that the four limiting blocks 4 engage and limit the core protective sleeves 6 and core 7, and connect them with glue. Then, the whole assembly 13 is placed into the groove 12 of the limiting block 4. The folding plate 17 is rotated towards the rubber rope 18, so that the folding plate 17 rotates with the connection point of the rubber rope 18 as the origin, and the connecting rod 16 rotates with the connection point of the semi-arc plate 15 as the origin. At the same time, the connecting rod 16 and the folding plate 17 rotate relative to each other, so that the folding plate 17 stretches the rubber rope 18 towards the semi-arc plate 15 with the connection point of the rubber rope 18 as the starting position.

[0037] When the folding plate 17 is attached to the rubber rope 18, since the folding plate 17 is a V-shaped structure, the angled end of the folding plate 17, the connection end between the folding plate 17 and the rubber rope 18, and the turning end of the folding plate 17 together form a triangular structure, which in turn forms a self-locking structure with the connecting rod 16, so that the rubber rope 18 and the semi-arc plate 15 fasten the four limiting blocks 4.

[0038] After the four limiting blocks 4 are tightened, glue is applied to the outer walls of the limiting blocks 4 and the flame-retardant layer 11. The buffer layer 3 is then fitted onto the limiting blocks 4 and the flame-retardant layer 11. After fitting, glue is applied to the outside of the buffer layer 3. The entire structure of the bending block 2 is then fitted onto the buffer layer 3. Through the above steps, several equally spaced bending blocks 2 are formed. At the same time, the outer protective sleeve 1 is fitted onto the buffer layer 3 between the equally spaced bending blocks 2 to form a complete cable. In use, after the entire cable is moved into the tunnel, the workers push the cable towards the tunnel wall or ground in the bending direction. Several braided layers... 21 and flexible protrusion 22 move synchronously, while braided layer 21 rotates towards flexible protrusion 22, squeezing braided layer 21. At the same time, under the action of arc groove 9 in reinforcing layer 8, its internal components are bent synchronously. Then, through the mounting groove 24 on moving plate 23, bolts are used to connect and fix it to the tunnel. The core 7 can be connected to the terminal block and then used. When the subway train passes through the cable, the buffer groove 14 of the buffer layer 3 in the outer protective sleeve 1 and bending block 2 undergoes elastic contraction and deformation to buffer the vibration generated by the subway train.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A Class B1 flame-retardant integrated protection cable for rail transit, comprising a plurality of cores arranged symmetrically in a circular pattern, wherein a core protective sleeve is fitted over the outer portion of each core, characterized in that: Several limiting blocks are arranged in a mirror-symmetrical manner on the outer side of several cores, and the limiting blocks are arranged in groups of four, and the limiting blocks are arranged in the same shape and structure. The four limiting blocks are arranged in a circular structure, and an inner groove is opened through the middle of the four limiting blocks. At the same time, a semi-core groove is opened through the connection between each pair of the four limiting blocks. The core and the core protective sleeve are located in the semi-core groove of the limiting block, and the two limiting blocks limit the core and the core protective sleeve. The outer side of the four limiting blocks is provided with a groove, and a disassembly and assembly component is provided in the groove of the limiting block. The inner groove of the limiting block is provided with a reinforcing layer, and the reinforcing layer is connected to the limiting block by glue. At the same time, the outer wall of the reinforcing layer is provided with four concave strips arranged in a cross shape. The reinforcing layer is made of synthetic fiber material. Several second heat dissipation holes are opened through the concave strips on the outer wall of the reinforcing layer and are arranged linearly and equally. The reinforcing layer has several symmetrically arranged arc-shaped grooves on both sides, and the arc-shaped grooves are connected to the second heat dissipation hole. The core protective sleeve and the core are located in the concave strip on the outer wall of the reinforcing layer, and the core protective sleeve is connected to the reinforcing layer by glue. The outer side of the reinforcing layer and the core protective sleeve is connected by adhesive with a flame-retardant layer, and the flame-retardant layer is located between two sets of limiting blocks. The flame-retardant layer is made of halogen-free environmentally friendly flame-retardant material. At the same time, several heat dissipation holes No. 1 are symmetrically distributed in a circle on the outer wall of the flame-retardant layer. The No. 1 heat dissipation hole is on the same straight line as the No. 2 heat dissipation hole in the concave strip of the core protective sleeve and the reinforcing layer. A buffer layer is provided on the outside of the flame retardant layer and the limiting block. The buffer layer is made of polyurethane. The buffer layer is connected to the flame retardant layer and the limiting block by glue. The buffer layer has several buffer grooves through it, and the buffer grooves are hexagonal in structure. The buffer layer is fitted with a bending block on the outside. Several bending blocks are fixedly connected to an outer protective sleeve in pairs. The bending block includes several woven layers and flexible protrusions. The woven layers and flexible protrusions are arranged alternately and are fixedly connected to each other. The flexible protrusions are made of flexible flame-retardant rubber. Meanwhile, the woven layers on both sides of the buffer layer are fixedly connected to a movable plate. Several mounting grooves are opened through the corners of the movable plate and are arranged in a circumferential pair.

2. The comprehensive protection B1-grade flame-retardant cable for rail transit according to claim 1, characterized in that, The assembly / disassembly assembly includes a semi-arc plate, one end of which is rotatably connected to a rubber rope. The rubber rope is made of elastic, non-slip rubber. The end of the rubber rope away from the semi-arc plate is rotatably connected to a folding plate, which has an overall V-shaped structure.

3. The comprehensive protection B1-grade flame-retardant cable for rail transit according to claim 2, characterized in that, The folding plate is set at an angle to the rubber rope at one end. The two sides of the semi-arc plate away from the rubber rope are rotatably connected to connecting rods, and the other end of the connecting rods is rotatably connected to the middle of the folding plate. At the same time, the semi-arc plate and the rubber rope limit the position of the limiting block.

Images