Comprehensive protection B1-level flame-retardant cable for rail transit

Abstract

The invention discloses a comprehensive protection B1-level flame-retardant cable for rail transit, and belongs to the technical field of cables, the comprehensive protection B1-level flame-retardant cable for rail transit comprises a plurality of core bodies which are distributed in a circumferential symmetry manner, and a plurality of limiting blocks which are arranged in a mirror symmetry manner are arranged on the outer sides of the plurality of core bodies; every four limiting blocks form a group, and meanwhile the multiple limiting blocks are arranged to be of the same shape and structure. According to the invention, the braid layer and the flexible bumps are arranged to bend the cable, and the buffer layer and the buffer grooves of hexagonal structures are arranged to perform vibration buffering, so that the cable can adapt to different bending angles, and breakage or damage caused by overlarge rigidity of the cable is avoided; meanwhile, the buffer layer and the buffer groove of the hexagonal structure can absorb and relieve vibration from a train through elastic contraction deformation, and the design enables the cable not to directly bear all vibration impacts, thereby reducing cable aging and damage caused by vibration.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cables, and particularly relates to a comprehensive protection B1-grade flame-retardant cable for rail transit. BACKGROUND

[0002] The comprehensive protection B1-grade flame-retardant cable for rail transit is a high-performance cable specially designed for rail transit systems, which has good flame-retardant properties, can delay the spread of fire and reduce the release of toxic gases in the event of a fire, and can protect passengers and staff. In the process of operation of the rail transit system, due to long-time power supply and use of a large number of electrical equipment, the risk of fire accidents is high. The B1-grade flame-retardant cable meets the national standard and can effectively prevent the spread of fire sources, delay the occurrence and spread of fire, thereby reducing the threat of fire to personnel and equipment. The rail transit system usually includes a plurality of important electrical equipment, such as signal systems and power supply systems. The B1-grade flame-retardant cable can ensure that these systems can still operate stably for a long time in extreme fire conditions, thereby avoiding equipment failure and affecting the normal operation of the train.

[0003] The existing comprehensive protection B1-grade flame-retardant cable for rail transit is often installed in a tunnel, and the cable must be laid in accordance with certain bending radius requirements, otherwise it may cause cable damage or performance degradation. However, when laying the cable in the tunnel, the space limitation makes it more difficult to control the bending radius, which can easily cause uneven stress on the cable and increase the risk of tunnel cable failure. In addition, the tunnel is often affected by the vibration of the subway train, which can cause cable fatigue, especially under high-frequency vibration, small cracks can appear in the wires or insulation layer inside the cable, which can expand over time, affecting the long-term stability and safety of the cable. SUMMARY

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

[0005] The technical solution adopted to solve the above technical problems is: a comprehensive protection B1-grade flame-retardant cable for rail transit, comprising a plurality of core bodies arranged in circumferential symmetry, and a core body protection sleeve arranged outside the core body, a plurality of limit blocks arranged outside the core body, the limit blocks being arranged in mirror symmetry, and the limit blocks being arranged in groups of four, and the limit blocks being arranged in the same shape and structure. Four said limit block overall circular structure is provided, and four limit block middle through the opening of the inner groove, while the four limit block between the connection through the opening of the half core groove, the core and the core protection cover is located in the half core groove of the limit block, and two limit block to the core and the core protection cover for limiting, four said limit block outside recess, and the recess of the limit block is provided with dismounting assembly.

[0006] Through the above technical scheme, when the cable is subjected to external force, it can be moderately stretched and bent, reducing the stress concentration caused by vehicle body vibration or track deformation, prolonging the service life of the cable, effectively dispersing the vibration from the train, and helping to evenly distribute the vibration energy through its geometric shape, reducing local excessive stress, ensuring uniform stress on the cable surface, and avoiding local damage.

[0007] Further, the dismounting assembly comprises a half-arc plate, and one end of the half-arc plate is rotatably connected with a rubber rope, and the rubber rope is made of elastic anti-skid rubber material, and the end of the rubber rope away from the half-arc plate is rotatably connected with a folding plate, and the folding plate has a V-shaped structure as a whole.

[0008] Further, the end of the folding plate facing the rubber rope is arranged at an angle with the rubber rope, and the two sides of the end of the half-arc plate away from the rubber rope are rotatably connected with connecting rods, and the other ends of the connecting rods are rotatably connected with the middle part of the folding plate, and the half-arc plate and the rubber rope limit the limit block.

[0009] Through the above technical scheme, during the operation of the rail transit cable, due to the change of temperature, the cable will expand or shrink, which can effectively absorb the expansion and contraction of the cable due to temperature change, avoid the stress generated by the temperature difference of the cable, and reduce the risk of cable rupture or damage.

[0010] Further, the bending block of the limit block is provided with a reinforcing layer, and the reinforcing layer is connected with the limit block by glue, and the outer wall of the reinforcing layer is provided with four recessed strips arranged in a cross shape, the reinforcing layer is made of synthetic fiber material, and a plurality of No. 2 heat dissipation holes arranged in a linear and equidistant manner are formed in the recessed strips on the outer wall of the reinforcing layer.

[0011] Through the above technical scheme, in the rail transit system, the cable is often affected by the vibration during vehicle driving, and the braided layer and the flexible protrusion can help reduce the direct transmission of these vibrations to the cable, avoid the damage of the cable caused by frequent vibration for a long time, and reduce the risk of wear, aging and cable rupture.

[0012] Further, a plurality of arc-shaped grooves arranged in circumferential symmetry are formed on the two sides of the reinforcing layer, and the arc-shaped grooves are communicated with the No. 2 heat dissipation holes, the core protection cover and the core are located in the recessed strips on the outer wall of the reinforcing layer, and the core protection cover is connected with the reinforcing layer by glue.

[0013] Further, the outer side of the reinforcing layer and the core protection sleeve is connected with a fire-retardant layer by glue, and the fire-retardant layer is located between the two groups of limiting blocks, the fire-retardant layer is a halogen-free environmentally friendly fire-retardant material, and a plurality of first heat dissipation holes are arranged in a circumferentially symmetrical manner on the outer wall of the fire-retardant layer, the first heat dissipation holes are located on the same straight line as the second heat dissipation holes in the core protection sleeve and the reinforcing layer concave strips.

[0014] Through the above technical scheme, the hexagonal structure of the buffer groove not only helps to reduce the direct impact of external vibration, but also can optimize the absorption and dispersion effect of vibration through its geometric shape, thereby enhancing the anti-seismic ability of the cable to the vibration generated during the operation of the subway train, this design can effectively stabilize the internal structure of the cable, especially in the frequent vibration environment, maintain the integrity and stability of the cable, and ensure that the cable will not be affected by vibration during long-term use. Performance decline.

[0015] Further, the outer side of the fire-retardant layer and the limiting block is sleeved with a buffer layer, the buffer layer is a polyurethane material, and the buffer layer and the fire-retardant layer and the limiting block are connected by glue, the buffer layer is provided with a plurality of buffer grooves, and the buffer grooves are arranged in a hexagonal structure.

[0016] Further, the outer side of the buffer layer is sleeved with a bending block, a plurality of the bending blocks are fixedly connected with an outer protective sleeve between each other, the bending block comprises a plurality of woven layers and flexible protrusions, the woven layers and the flexible protrusions are arranged alternately, and the woven layers and the flexible protrusions are fixedly connected, the flexible protrusions are made of flexible fire-retardant rubber material, and the woven layers on both sides of the buffer layer are fixedly connected with a moving plate, a plurality of mounting grooves are arranged in a circumferentially symmetrical manner on the corner of the moving plate.

[0017] Through the above technical scheme, while adding the buffer layer and the hexagonal structure buffer groove in the design, the B1 grade fire-retardant property ensures that the cable can effectively delay the spread of fire and increase the safety of the cable even if a fire occurs when the cable is subjected to external vibration or impact.

[0018] The beneficial effects of the present application are as follows: By arranging the woven layer and the flexible protrusion, when the cable is installed, the worker can directly move the cable, the woven layer is rotated towards the flexible protrusion, the woven layer is extruded, and under the action of the arc-shaped groove in the reinforcing layer and the synchronous bending of the internal components of the cable, stress is generated when the cable is bent, especially at the bending part with a large angle, which may cause damage to the insulating layer of the cable or breakage of the internal conductor, the stress at the bending part can be effectively dispersed to avoid stress concentration, thereby prolonging the service life of the cable.

[0019] The application sets the buffer layer and the buffer groove with hexagonal structure, when the subway train passes through the cable, the buffer groove of the buffer layer is elastically contracted and deformed, the vibration generated by the subway train is buffered, the buffer groove with hexagonal structure provides relatively uniform stress distribution, under the action of external force, the buffer layer can evenly disperse the vibration and impact force, reduce the local stress, avoid structural damage of some parts of the cable due to excessive stress. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the overall structure schematic diagram of the application; Figure 2 is the local structure schematic diagram of the application; Figure 3 is the sectional structure schematic diagram of Figure 2 ; Figure 4 is the structure schematic diagram of the connection between the buffer layer and the limiting block of the application; Figure 5 is the structure schematic diagram of the connection between the limiting block and the flame-retardant layer of the application; Figure 6 is the structure schematic diagram of the connection between the reinforcing layer and the limiting block of the application; Figure 7 is the structure schematic diagram of the limiting block of the application; Figure 8 is the first perspective structure schematic diagram of the disassembly and assembly component of the application; Figure 9 is the second perspective structure schematic diagram of the disassembly and assembly component of the application.

[0021] Significant: 1, outer protective sleeve;2, bending block;3, buffer layer;4, limiting block;5, half core body groove;6, core body protective sleeve;7, core body;8, reinforcing layer;9, arc-shaped groove;10, No. 1 heat dissipation hole;11, flame-retardant layer;12, groove;13, disassembly and assembly component;14, buffer groove;15, half-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 DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the application more clear and understandable, the application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the application, and are not used to limit the application.

[0023] As Figures 1-2The embodiment of the application is a kind of rail transit comprehensive protection B1 grade flame-retardant cable, including several circumferentially symmetrically distributed core 7, and the core 7 outside position is sleeved with core protection sleeve 6, several core 7 outside position is provided with several mirror image symmetrically arranged limiting block 4, and several limiting block 4 four are a group, simultaneously several limiting block 4 are the same shape structure setting, four limiting block 4 whole is circular structure setting, the bending block 2 in limiting block 4 is provided with reinforcing layer 8, can be stretched and bent moderately when cable is subjected to external force, reduce the stress concentration due to the vibration of car body or track deformation, prolong the service life of cable, effectively dispersing the vibration from the train at the same time, help to distribute vibration energy evenly through its geometry, reduce local excessive stress, ensure that the cable surface is uniformly stressed, avoid local damage, and the reinforcing layer 8 and limiting block 4 are connected by glue, and 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, and the reinforcing layer 8 is provided with a plurality of circumferentially symmetrically arranged arc-shaped grooves 9 on both sides, and the arc-shaped grooves 9 are communicated with the second heat dissipation holes 19.

[0024] As Figures 2-6 The core protection sleeve 6 and the core 7 are located in the concave strip on the outer wall of the reinforcing layer 8, and the core protection sleeve 6 and the reinforcing layer 8 are connected by glue, a plurality of second heat dissipation holes 19 arranged linearly and equidistantly are provided in the concave strip on the outer wall of the reinforcing layer 8, the reinforcing layer 8 and the core protection sleeve 6 are connected by glue, the flame-retardant layer 11 is provided on the outer side of the limiting block 4, and the flame-retardant layer 11 and the limiting block 4 are sleeved with the buffer layer 3, the buffer layer 3 and the buffer groove 14 with a hexagonal structure are added in the design, the B1 grade flame-retardant property ensures that the cable can effectively delay the spread of fire when subjected to external vibration or impact, even in the event of a fire, increases the safety of the cable, the buffer layer 3 is sleeved with the bending block 2, a plurality of bending blocks 2 are fixedly connected with the outer protective sleeve 1 between each other, and the bending block 2 comprises a plurality of braided layers 21 and flexible protrusions 22, the braided layers 21 and the flexible protrusions 22 are arranged alternately, and the braided layers 21 and the flexible protrusions 22 are fixedly connected, the flexible protrusions 22 are made of flexible flame-retardant rubber material, and the braided layers 21 fixedly connected with the moving plate 23 are arranged on both sides of the buffer layer 3, in the rail transit system, the cable is often affected by vibration during vehicle driving, the braided layers 21 and the flexible protrusions 22 can help to reduce the direct transmission of these vibrations to the cable, avoid the damage of the cable caused by frequent vibration for a long time, reduce the risk of wear, aging and cable fracture, a plurality of installation grooves 24 arranged circumferentially are provided in the corner of the moving plate 23, the buffer layer 3 is made of polyurethane material, the buffer layer 3, the flame-retardant layer 11 and the limiting block 4 are connected by glue, the buffer layer 3 is provided with a plurality of buffer grooves 14, and the buffer grooves 14 are arranged in a hexagonal structure, and the flame-retardant layer 11 is located between the two groups of limiting blocks 4.

[0025] AsFigures 1-9 As shown, the fire-retardant layer 11 is a halogen-free environmentally friendly fire-retardant material, and a plurality of first heat dissipation holes 10 are arranged in a circumferentially symmetrical manner on the outer wall of the fire-retardant layer 11. The first heat dissipation holes 10 are located on the same straight line as the second heat dissipation holes 19 in the concave strips of the reinforcing layer 8 and the core protection sleeve 6, and an inner groove 20 is arranged in the middle of the four limiting blocks 4. A half-core groove 5 is arranged at the connection between each two limiting blocks 4. The core 7 and the core protection sleeve 6 are located in the half-core groove 5 of the limiting block 4, and the two limiting blocks 4 limit the core 7 and the core protection sleeve 6. During the operation of the rail transit cable, the cable will expand or contract due to temperature changes. The expansion and contraction of the cable caused by temperature changes can be effectively absorbed, and the stress caused by temperature changes can be avoided, thereby reducing the risk of cable rupture or damage. The recess 12 is arranged on the outer side of the limiting block 4, and the dismounting assembly 13 is arranged in the recess 12 of the limiting block 4. The dismounting assembly 13 includes a half-arc plate 15, and the half-arc plate 15 is rotatably connected to the rubber rope 18 at one end. The rubber rope 18 is made of elastic and anti-slip rubber material. The folding plate 17 is rotatably connected to the end of the rubber rope 18 away from the half-arc plate 15. The folding plate 17 is arranged at an angle with the rubber rope 18. The connecting rods 16 are rotatably connected to the two sides of the end of the half-arc plate 15 away from the rubber rope 18. The hexagonal structure of the buffer groove 14 not only helps to reduce the direct impact of external vibration, but also can optimize the absorption and dispersion effect of vibration through its geometric shape, thereby enhancing the anti-seismic ability of the cable to the vibration generated during the operation of the subway train. This design can effectively stabilize the internal structure of the cable, especially in a frequent vibration environment, maintain the integrity and stability of the cable, and ensure that the cable will not be affected by vibration during long-term use. The connecting rod 16 is rotatably connected to the middle of the folding plate 17 at the other end, and the half-arc plate 15 and the rubber rope 18 limit the limiting block 4. The folding plate 17 is arranged in a V-shaped structure.

[0026] The working principle of the embodiment is as follows: when the application is produced, the core protection sleeve 6 is wrapped at the position of the outer wall of the core 7, the core protection sleeve 6 is made of rubber insulation material, and is wrapped by heat molding, so that the core protection sleeve 6 is tightly wrapped on the outer side of the core protection sleeve 6, then the outer side of the core protection sleeve 6 is brushed with glue, the four heat-molded cores 7 are put into the concave strips of the reinforcing layer 8, connected by glue, and the outer wall of the reinforcing layer 8 is brushed with glue, the cores 7 and the reinforcing layer 8 of the above steps are put into the flame-retardant layer 11, and the first heat dissipation hole 10, the second heat dissipation hole 19 and the core 7 are located on the same straight line, then the two groups of four limiting blocks 4 are spliced into a circular frame and placed at both ends of the flame-retardant layer 11, then the core protection sleeve 6 and 7 are put into the half-core grooves 5 of the four limiting blocks 4, so that the four limiting blocks 4 clamp and limit the core protection sleeve 6 and the core 7, and are connected by glue, then the whole disassembly assembly 13 is put into the recess 12 of the limiting block 4, the folding plate 17 is rotated towards the rubber rope 18, so that the folding plate 17 rotates around the connection position of the rubber rope 18, and then the connecting position of the connecting rod 16 and the half-arc plate 15 rotates, and the connecting rod 16 and the folding plate 17 rotate relatively, so as to make the folding plate 17 stretch the rubber rope 18 towards the half-arc plate 15.

[0027] When the folding plate 17 is attached to the rubber rope 18, since the folding plate 17 is provided in a V-shaped structure, when the folding plate 17 is attached to the rubber rope 18, the angle end of the folding plate 17 and the connecting end of the folding plate 17 and the rubber rope 18, and the turning end of the folding plate 17 are provided in a triangular structure, and then form a self-locking structure with the connecting rod 16, so that the rubber rope 18 and the half-arc plate 15 fasten the four limiting blocks 4.

[0028] Four limit blocks 4 are fastened, and then glue is brushed on the outer wall of the limit block 4 and the fireproof layer 11, the buffer layer 3 is sleeved with the limit block 4 and the fireproof layer 11, after sleeving, glue is brushed on the outside of the buffer layer 3, the integral structure of the bending block 2 is sleeved with the buffer layer 3, through the above steps, a plurality of equidistant bending blocks 2 are formed, meanwhile, the outer protective sleeve 1 is sleeved with the buffer layer 3 between the equidistant bending blocks 2, a complete cable is formed, when used, the integral cable is moved into the tunnel, then the workers push the cable to the bending direction of the tunnel wall or the ground, a plurality of braided layers 21 and flexible protrusions 22 move synchronously, meanwhile, the braided layer 21 rotates to the flexible protrusion 22 direction, the braided layer 21 is extruded, meanwhile, under the action of the arc-shaped groove 9 in the reinforcing layer 8 and the synchronous bending of the internal components of the cable, the moving plate 23 is used to connect and fix the tunnel through the installation groove 24, the core 7 is connected with the wiring terminal, and then it can be 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 the bending block 2 is elastically contracted and deformed, and the vibration generated by the subway train is buffered.

[0029] The above merely describes preferred embodiments of the present application, but is not used to limit the protection scope of the present application.

Claims

1. A B1 grade flame retardant cable with comprehensive protection for rail transit, comprising a plurality of cores (7) arranged in a circumferentially symmetrical distribution, wherein a core protective cover (6) is provided on the outer portion of the core (7), characterized in that: Several limit blocks (4) are arranged at the outer sides of the core bodies (7) in a mirror-symmetrical manner, and the limit blocks (4) are grouped into four, and the limit blocks (4) are arranged in the same shape and structure. The four limiting blocks (4) are arranged in a circular structure as a whole, and an inner groove (20) is opened through the middle of the four limiting blocks (4). At the same time, a half-core groove (5) is opened through the connection between the four limiting blocks (4). The core (7) and the core protective cover (6) are located in the half-core groove (5) of the limiting blocks (4), and the two limiting blocks (4) limit the core (7) and the core protective cover (6). A groove (12) is opened on the outside of the four limiting blocks (4), and a disassembly assembly (13) is provided in the groove (12) of the limiting block (4).

2. A comprehensive protection B1 flame retardant cable for rail transit according to claim 1, characterized in that: The disassembly assembly (13) includes a semi-arc plate (15), and one end of the semi-arc plate (15) is rotatably connected to a rubber rope (18), and the rubber rope (18) is made of elastic non-slip rubber material. The end of the rubber rope (18) away from the semi-arc plate (15) is rotatably connected to a folding plate (17), and the folding plate (17) is arranged in a V-shaped structure as a whole.

3. A comprehensive protection B1 flame retardant cable for rail transit according to claim 2, characterized in that: The folding plate (17) is arranged at an angle with one end of the rubber rope (18) facing the rubber rope (18), and the semi-arc plate (15) is rotatably connected to the connecting rod (16) on both sides of the end away from the rubber rope (18), and the connecting rod (16) is rotatably connected to the middle part of the folding plate (17). At the same time, the semi-arc plate (15) and the rubber rope (18) limit the limit block (4).

4. The rail transit comprehensive protection B1 grade flame retardant cable according to claim 1, characterized in that: A reinforcing layer (8) is provided in the bending block (2) of the limiting block (4), and the reinforcing layer (8) is connected to the limiting block (4) by glue. At the same time, the outer wall of the reinforcing layer (8) is provided with four concave strips arranged in a cross-shaped structure. The reinforcing layer (8) is made of synthetic fiber material. A plurality of No. 2 heat dissipation holes (19) arranged linearly and equidistantly are opened through the concave strips on the outer wall of the reinforcing layer (8).

5. A comprehensive protection B1 flame retardant cable for rail transit according to claim 4, characterized in that: A plurality of arcuate grooves (9) are provided on both sides of the reinforcing layer (8) and are arranged in a circumferentially symmetrical manner. The arcuate grooves (9) are connected to the second heat dissipation hole (19). The core protective cover (6) and the core (7) are located in the concave strip of the outer wall of the reinforcing layer (8), and the core protective cover (6) and the reinforcing layer (8) are connected by glue.

6. A comprehensive protection B1 flame retardant cable for rail transit according to claim 5, characterized in that: The outer sides of the reinforcing layer (8) and the core protective cover (6) are connected with a flame retardant layer (11) by glue, and the flame retardant layer (11) is located between the two groups of the limit blocks (4). The flame retardant layer (11) is made of a halogen-free, environmentally friendly flame retardant material. At the same time, the outer wall of the flame retardant layer (11) is penetrated by a plurality of No. 1 heat dissipation holes (10) arranged in a circumferentially symmetrical distribution. The No. 1 heat dissipation holes (10) and the No. 2 heat dissipation holes (19) in the concave strips of the core protective cover (6) and the reinforcing layer (8) are located on the same straight line.

7. A comprehensive protection B1 flame retardant cable for rail transit according to claim 6, characterized in that: A buffer layer (3) is provided on the outer side of the flame retardant layer (11) and the limit block (4), and the buffer layer (3) is made of polyurethane. The buffer layer (3) is connected to the flame retardant layer (11) and the limit block (4) by glue. A plurality of buffer grooves (14) are provided through the buffer layer (3), and the buffer grooves (14) are arranged in a hexagonal structure.

8. The rail transit integrated protection B1 flame retardant cable according to claim 7, characterized in that: The buffer layer (3) is sleeved with a bending block (2) on the outside, and a plurality of the bending blocks (2) are fixedly connected with an outer protective sleeve (1) between each other, and the bending block (2) includes a plurality of braided layers (21) and flexible protrusions (22), the braided layers (21) and the flexible protrusions (22) are alternately arranged, and the braided layers (21) and the flexible protrusions (22) are fixedly connected, and the flexible protrusions (22) are made of flexible flame-retardant rubber material. At the same time, the braided layers (21) on both sides of the buffer layer (3) are fixedly connected with a movable plate (23), and a plurality of mounting grooves (24) distributed in a circumferential pair are opened through the corners of the movable plate (23).

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