A low smoke halogen-free flame retardant cable

Abstract

The present invention relates to the field of cable technology, specifically to a low-smoke halogen-free flame-retardant cable, comprising a plurality of conductor cores, the outer sheath of the conductor cores is provided with an isolation layer, the outer sheath of the plurality of isolation layers is provided with an inner sheath, the outer sheath of the inner sheath is provided with a functional protection component, the outer part of the functional protection component is wrapped with a binding belt, and the outer sheath of the binding belt is provided with an outer sheath; the functional protection component comprises a plurality of circular rings sheathed on the outer part of the inner sheath, a cooling component is fixedly connected between two adjacent circular rings, and an isolation component is installed on the outer side of the circular ring to prevent the ignition point from extending to both sides from the spontaneous combustion point of the cable, and the isolation component comprises a plurality of elastic plates made of magnetic metal material fixedly connected to the circular rings, a limiting groove is provided on the side of the elastic plate away from the circular ring, and a rubber ring is provided on the outer sheath of the plurality of elastic plates. The problem of the cost of protecting the existing cable when the short-circuit spontaneous combustion point is blocked by the bridge frame and moves in a direction parallel to the cable is solved.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to a low-smoke halogen-free flame-retardant cable. Background Art

[0002] Fire-resistant cables are an important component of cable products. After the cable is burned, the internal structure may have been severely damaged and generally cannot be used anymore. After searching, the Chinese invention patent with application number CN202210797700.2 discloses a Class B1 flame-retardant cable. The heat-deformed part is deformed by heat to expand the inner bend of the outer sheath, so that the internal space of the outer sheath becomes larger, the side wall is separated from the core, and the resistance to pulling out the core is reduced, so that the damaged flame-retardant core can be easily pulled out and the new flame-retardant core can be inserted, so that a single core can be replaced without replacing the entire cable, thereby reducing costs.

[0003] The above-mentioned device is suitable for the situation where a single cable core is damaged due to a short circuit in the cable. It can pull out a single longer cable core inside the cable and replace it. Generally, multiple cables are installed on the bridge. When one of the cables short-circuit and spontaneously combusts, even if the short-circuited line can be cut off in time, it will also affect other cables in the bridge. Moreover, after the spontaneous combustion point is blocked by the bridge, it will move along the surface of the bridge in a direction parallel to the cable, which can easily cause local damage to the surrounding good cables. In this case, the cable is generally damaged in a small section. It is difficult to pull out the cable core for replacement. The damaged part of the cable can only be cut off, and then the broken cable can be connected with tools. However, it is difficult to protect the cable when the short-circuit spontaneous combustion point is blocked by the bridge and moves in a direction parallel to the cable, resulting in an extended burn length and increased cost of later cable maintenance. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a low-smoke halogen-free flame-retardant cable, which solves the cost problem of the existing cables being difficult to protect when the short-circuit spontaneous combustion point is blocked by the bridge and moves in a direction parallel to the cable.

[0005] To achieve the above object, the present invention provides the following technical solution: a low-smoke halogen-free flame-retardant cable, comprising a plurality of conductor cores, the outer sheath of the conductor cores is provided with an isolation layer, the outer sheaths of the plurality of isolation layers are provided with an inner sheath, the outer sheath of the inner sheath is provided with a functional protection component, the outer side of the functional protection component is wrapped with a binding belt, and the outer sheath of the binding belt is provided with an outer sheath;

[0006] The functional protection component includes a plurality of circular rings sleeved on the outside of the inner sheath, a cooling component is fixedly connected between two adjacent circular rings, and an isolation component is installed on the outside of the circular ring to prevent the ignition point from extending to both sides from the spontaneous combustion point of the cable;

[0007] The isolation assembly includes multiple elastic plates made of magnetic metal material fixedly connected to the circular ring, a limiting groove is provided on the side of the elastic plate away from the circular ring, a rubber ring extending into the limiting groove is sleeved on the outside of the multiple elastic plates, multiple storage grooves are provided on the outside of the circular ring, the storage grooves are filled with magnetic balls, and a rubber membrane covering the storage grooves is fixedly connected to the outside of the circular ring.

[0008] Preferably, the cooling component includes a plurality of metal rods distributed between two circular rings, both ends of the metal rods are sleeved with rubber sleeves, one end of the rubber sleeve is movably extended to the inside of the circular ring, a circular hole matching the rubber sleeve is provided on one side of the circular ring, both ends of the metal rods are provided with arc grooves, and the inner wall of the rubber sleeve is provided with an anti-sliding block extending to the inside of the arc groove.

[0009] Preferably, the circular ring comprises a left half ring and a right half ring, both ends of the left half ring are provided with extension grooves, and both ends of the right half ring are provided with extension blocks that movably extend into the extension grooves.

[0010] Preferably, an anti-slip strip is fixedly connected to one end of the outer side of the left half ring away from the elastic plate, and an anti-slip groove matched with the anti-slip strip is provided on the outer side of the extension block.

[0011] Preferably, the inner walls of the left half ring and the right half ring are both provided with a plurality of fold line grooves, and the circular ring is made of metal.

[0012] Preferably, the isolation layer comprises an inner shielding layer sleeved on the outside of the conductor core, the outer part of the inner shielding layer is sleeved with an insulating layer, the outer part of the insulating layer is sleeved with an outer shielding layer, and the outer part of the outer shielding layer is sleeved with a metal shielding layer.

[0013] Preferably, an insulated conductor bobbin is provided at the inner center of the inner sheath, and a filler is filled inside the inner sheath outside the metal shielding layer.

[0014] Preferably, the inner sheath is made of halogen-free, low-smoke, flame-retardant polyolefin.

[0015] Preferably, the adjacent metal rods are filled with filling strips slidably connected to the inner sheath, and the binding belts are wrapped around the functional protection components and the outside of the filling strips.

[0016] Compared with the prior art, the present invention provides a low-smoke halogen-free flame-retardant cable, which has the following beneficial effects:

[0017] 1. Through the functional protection components set up, the spontaneous combustion point of the cable is isolated from both sides, and the burning point that moves in the direction parallel to the cable after being blocked by the bridge is blocked, so that the burning point that originally moved in the direction parallel to the cable is blocked and moves in the direction away from the cable. When the cables on both sides are also affected by the short-circuited and spontaneously combusted cables, the functional protection components on both sides are deployed again to block the burning point that moves in the direction parallel to the cable. By changing the direction of the burning point that originally moved in the direction of the cable and tilting it away from the cable, a state of gradual protection of the cable from the spontaneous combustion point to both sides is formed. The burning point that moves along the direction of the cable is changed step by step through the process of multiple blocking to change the direction away from the cable, thereby reducing the length of the cable that is affected by other cables that are short-circuited and spontaneously combusted in the bridge. In the later maintenance of the cable, it is only necessary to replace the burned area of ​​the cable and reconnect it, which can reduce the loss of the cable burned by other short-circuited and spontaneously combusted cables in the bridge and reduce the cost of later cable maintenance.

[0018] 2. Through the setting of the isolation component, a firewall can be formed on both sides of the spontaneous combustion point of the cable, blocking the combustion point from moving in a direction parallel to the cable and keeping the combustion point away from the cable. At the same time, a magnetic ball layer is formed on the surface of the elastic plate using a magnetic ball, which increases the thickness of the firewall and improves the blocking effect on the combustion point on the cable that moves from the spontaneous combustion point in a direction parallel to the cable. Moreover, the magnetic ball can absorb heat from the cable surface and the surrounding environment, and then fall off the cable after the temperature rises to a certain level, forming a heat absorption and cooling effect on the spontaneous combustion point of the cable, reducing the temperature around the spontaneous combustion point of the cable, and improving the blocking effect of the firewall formed by the elastic plate on the combustion point on the cable surface.

[0019] 3. By setting the left half ring and the right half ring, the covering of the inner sheath of the cable and the assembly of the functional protection components can be carried out simultaneously, and then the assembled functional protection components can be fixed on the inner sheath of the cable. There is no need to gradually assemble the functional protection components along the length direction after the inner sheath of the cable is covered, which improves the production automation degree and speed of cables with functional protection components.

[0020] 4. The cooling component can absorb the temperature of the cable surface and drop the metal rod that has absorbed the heat at the burned part of the cable, thereby reducing the heat around the spontaneous combustion point of the cable and reducing the possibility of the heat of the cable at the spontaneous combustion point being transferred to both sides, causing the cables on both sides to be damaged due to excessive temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 is a three-dimensional schematic diagram of the cable of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the functional protection component of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of a part of the functional protection component of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the cooling component of the present invention;

[0026] Figure 5 This is a state diagram of the ring and the isolation assembly of the present invention when they are working normally inside the cable;

[0027] Figure 6 It is a state diagram of the ring and the isolation assembly of the present invention when they are damaged at the spontaneous combustion point of the cable;

[0028] Figure 7 It is a schematic diagram of the structure of the ring of the present invention;

[0029] Figure 8 It is a schematic diagram of the structure of the elastic plate and the rubber ring of the present invention;

[0030] Fig. 9 For the present invention Figure 1 Schematic diagram of the structure enlarged at point A in the middle.

[0031] In the figure: 1. conductor core; 2. isolation layer; 21. inner shielding layer; 22. insulation layer; 23. outer shielding layer; 24. metal shielding layer; 3. inner sheath; 4. functional protection component; 41. ring; 411. left half ring; 412. right half ring; 413. extension block; 414. anti-slip strip; 42. cooling component; 421. metal rod; 422. rubber sleeve; 423. anti-slip block; 43. isolation component; 431. elastic plate; 432. rubber ring; 433. magnetic ball; 434. rubber film; 5. binding tape; 6. outer sheath; 7. insulated conductor bobbin; 8. filler; 9. filling strip. DETAILED DESCRIPTION

[0032] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0033] Embodiment 1

[0034] In order to prevent the spontaneous combustion point from moving in a direction parallel to the cable after being blocked by the bridge when the cable short-circuit spontaneous combustion occurs in the bridge, reduce the impact of a single cable short-circuit spontaneous combustion in the bridge on the surrounding cables, and achieve the purpose of reducing the length of the burned cable. Figure 1-Figure 6As one embodiment of the present invention, a low-smoke halogen-free flame-retardant cable comprises a plurality of conductor cores 1, an insulating layer 2 is provided on the outside of the conductor cores 1, an inner sheath 3 is provided on the outside of the plurality of insulating layers 2, a functional protection component 4 is provided on the outside of the inner sheath 3, a binding belt 5 is wrapped around the outside of the functional protection component 4, an outer sheath 6 is provided on the outer sheath of the binding belt 5, when in use, the binding belt 5 is wrapped around the outside of the functional protection component 4 to form a smooth cylindrical shape on the outside of the functional protection component 4, so that it is convenient to use an extruder to cover the outer sheath 6 on the outside, when the cable is affected by other cables that spontaneously ignite due to a short circuit in the cable bridge, the outer sheath 6 of the cable at the burnt part of the spontaneous combustion point is damaged, the binding belt 5 is also burned, and the functional protection component 4 at the burnt part of the cable is no longer wrapped, at this time the functional protection component 4 is unfolded to isolate the cable combustion point from both sides, and the spontaneous combustion point is blocked by the cable bridge The burning point moving in the direction parallel to the cable is then blocked, so that the burning point originally moving in the direction parallel to the cable is blocked and then moves in the direction away from the cable. When the cables on both sides are also affected by the short-circuited and self-ignited cables, the functional protection components 4 on both sides are deployed again to block the burning point moving in the direction parallel to the cable. By changing the direction of the burning point originally moving in the direction of the cable and tilting it away from the cable, a state of gradual protection of the cable from the self-ignition point to both sides is formed. The burning point moving along the direction of the cable is gradually changed away from the cable by utilizing multiple blocking processes, thereby reducing the length of the cable burned by other cables short-circuited and self-ignited in the cable tray. During the later maintenance of the cable, only the burned area of ​​the cable needs to be replaced and reconnected, which can reduce the loss of the cable burned by other short-circuited and self-ignited cables in the cable tray and reduce the cost of later cable maintenance.

[0035] In order to reduce the impact of short-circuit spontaneous combustion on the cables on both sides and other adjacent cables, refer to Figure 2 and Figure 3 The functional protection component 4 includes a plurality of circular rings 41 sleeved on the outside of the inner sheath 3, a cooling component 42 is fixedly connected between two adjacent circular rings 41, and an isolation component 43 is installed on the outside of the circular ring 41 to block the ignition point from extending to both sides from the spontaneous combustion point of the cable. When in use, the outer sheath 6 and the binding belt 5 of the cable burned by the short-circuit spontaneous combustion around the cable in the bridge are damaged after being burned, and the internal functional protection component 4 is exposed. After the isolation component 43 is unfolded, a protective wall is formed on both sides of the spontaneous combustion point of the cable to block the ignition point of the cable from moving in a direction parallel to the cable after being blocked by the bridge due to the short-circuit spontaneous combustion. During the burning process of the cable, the cable and the cooling component 42 are both heated up. After the cooling component is heated to a certain temperature, it is detached from the cable to remove part of the heat on the cable, and the damage to the cable caused by spontaneous combustion in the cable bridge is reduced by the dual methods of isolating the spontaneous combustion point of the cable and cooling the cable.

[0036] The normal range of cable heating is generally around 40°C, which is the normal temperature of the cable surface during operation. Because the wire itself has a high temperature resistance, it is basically 65°C, 70°C, 90°C or even higher. However, it should be noted that if the cable heats up beyond the normal range for a long time, it may affect its service life and safety. The temperature range for magnet demagnetization depends on its Curie temperature. Generally speaking, the Curie temperature of ordinary ferrite magnets is between 450°C and 480°C. When the temperature exceeds this range, the magnet will begin to demagnetize, while NdFeB magnets usually demagnetize at above 340°C.

[0037] Taking advantage of the demagnetization characteristics of magnets in high temperature environments, refer to Figure 3 , magnets are used to improve the blocking effect of the spontaneous combustion point of the cable. The isolation component 43 includes multiple elastic plates 431 made of magnetic metal material fixedly connected to the circular ring 41. A limiting groove is provided on the side of the elastic plate 431 away from the circular ring 41. The outer parts of the multiple elastic plates 431 are sleeved with rubber rings 432 extending to the inner part of the limiting groove. The outer side of the circular ring 41 is provided with multiple storage grooves, and the storage grooves are filled with magnetic balls 433. The outer part of the circular ring 41 is fixedly connected with a rubber film 434 covering the storage grooves. When in use, the elastic plate 431 is pressed on the circular ring 41 in the normal use state of the cable, and a circle of rubber ring 432 is sleeved on the outer side of the elastic plate 431 to wrap the elastic plate 431 on the circular ring 41, and then the elastic plate 431 is bound again on the outer side with a binding belt 5. At this time, the state of the circular ring 41 and the isolation component 43 is as follows: Figure 5 .

[0038] When the cable is burned by the surrounding short-circuited cables in the bridge, the outer sheath 6 and the binding belt 5 of the cable are burned and damaged, and the rubber ring 432 is also burned and broken. At this time, the outer side of the elastic plate 431 is no longer bound. The elastic plate 431 deflects away from the ring 41 due to its own elasticity. In an ideal state, it rotates to a direction perpendicular to the cable axis. At this time, the state of the ring 41 and the isolation component 43 is as follows. Figure 6 At this time, the unfolded elastic plate 431 forms a firewall on both sides of the cable spontaneous combustion point, preventing the cable from being blocked by the bridge frame after short-circuiting and spontaneously igniting, and moving in a direction parallel to the cable, so that the short-circuit spontaneous combustion direction is tilted and moves away from the cable. At the same time, in the early stage of cable spontaneous combustion, the temperature of the magnetic ball 433 has not yet increased, and the rubber film 434 is burned. The magnetic ball 433 moves to the surface of the elastic plate 431 due to the magnetic attraction with the elastic plate 431 made of magnetic metal material, and forms a magnetic ball layer on the surface of the elastic plate 431.

[0039] The magnetic ball 433 utilizes the good thermal conductivity of metal to absorb heat from the cable surface and the surrounding environment until the temperature of the magnetic ball 433 rises to a certain level and then gradually demagnetizes. The magnetic attraction between the magnetic ball 433 and the elastic plate 431 is not sufficient to attach the magnetic ball 433 to the elastic plate 431. At this time, the magnetic ball 433 whose temperature has been raised falls off the elastic plate 431, and can form a firewall on both sides of the spontaneous combustion point of the cable, blocking the ignition point from moving in a direction parallel to the cable, and keeping the ignition point away from the cable. At the same time, the magnetic ball 433 is used to form a magnetic ball layer on the surface of the elastic plate 431, which increases the thickness of the firewall and improves the blocking effect on the ignition point on the cable that moves from the spontaneous combustion point in a direction parallel to the cable. Moreover, the magnetic ball 433 can absorb heat from the cable surface and the surrounding environment, and then falls off the cable after the temperature rises to a certain level, forming a heat absorption and cooling effect on the spontaneous combustion point of the cable, reducing the temperature around the spontaneous combustion point of the cable, and improving the blocking effect of the firewall formed by the elastic plate 431 on the ignition point on the cable surface.

[0040] The magnetic ball 433 is small in size and is less likely to affect the operation of the cable. In addition, the magnetic ring sleeve is widely used outside the wire. In order to reduce the impact of the magnetic ball 433 on the cable, a magnetic ball with smaller magnetism can be selected, and the number of magnetic balls 433 in the ring 41 can be controlled to ensure that the operation of the cable is not affected by the magnetic ball 433.

[0041] Embodiment 2

[0042] In order to make the cable processing more convenient, refer to Figure 1-Figure 7 On the basis of the first embodiment, the circular ring 41 comprises a left semi-ring 411 and a right semi-ring 412, both ends of the left semi-ring 411 are provided with extension grooves, both ends of the right semi-ring 412 are provided with extension blocks 413 which are movably extended to the inside of the extension grooves, an end of the outer side of the left semi-ring 411 away from the elastic plate 431 is fixedly connected with an anti-slip strip 414, an anti-slip groove which is adapted to the anti-slip strip 414 is provided on the outer side of the extension block 413, a plurality of folding grooves are provided on the inner walls of the left semi-ring 411 and the right semi-ring 412, and the circular ring 41 is made of metal. When processing the cable, the functional protection component 4 can be assembled first, and then the functional protection components 4 respectively connected to the left semi-ring 411 and the right semi-ring 412 are respectively sleeved on both sides of the inner sheath 3 of the cable, and after the left semi-ring 411 and the right semi-ring 412 are fixed to the inner sheath 3 of the cable, the cable binding belt 5 and the outer sheath 6 can be installed, and the specific installation process of the functional protection component 4 is as follows:

[0043] First, install the cooling assembly 42 between the two left half rings 411 and the right half ring 412, so that the multiple left half rings 411 and the right half rings 412 are connected into a continuous long section, and then the continuous left half rings 411 and the right half rings 412 are respectively put on both sides of the inner sheath 3 along the length direction of the cable inner sheath 3, and the folding groove prevents the circular ring 41 from sliding along the length direction of the cable. Then, press the elastic plate 431 on the circular ring 41, and then use the rubber ring 432 to be put into the limiting groove of the elastic plate 431 to limit the elastic plate 431 on the circular ring 41, and finally use pliers to press the left half ring 411 and the right half ring 41 2, the joint of the left half ring 411 and the right half ring 412 is pressed and deformed and fixed on the inner sheath 3 of the cable, and the anti-slip strip 414 is squeezed and the extension block 413 is pressed and deformed into the anti-slip groove to prevent the ring 41 from falling off the inner sheath 3 of the cable, and the covering of the inner sheath of the cable and the assembly of the functional protection component 4 can be carried out simultaneously, and then the assembled functional protection component 4 can be fixed on the inner sheath 3 of the cable, and there is no need to gradually form the functional protection component 4 along the length direction after the inner sheath 3 of the cable is covered, thereby improving the production automation degree and speed of the cable with the functional protection component 4.

[0044] Embodiment 3

[0045] Although the isolation assembly 43 can prevent the cable burning point from moving to both sides in a direction parallel to the cable, the temperature generated by the short circuit spontaneous combustion can still be transmitted to the cables on both sides of the spontaneous combustion point through the air or the cable, causing the cable to be damaged after it rises to a certain temperature. In order to reduce the temperature of the section around the cable spontaneous combustion point and reduce the possibility of cable damage due to excessive temperature, refer to Figure 1-Figure 8 On the basis of the first embodiment, the cooling component 42 includes a plurality of metal rods 421 distributed between the two circular rings 41, both ends of the metal rods 421 are sleeved with rubber sleeves 422, one end of the rubber sleeve 422 is movably extended to the inside of the circular ring 41, one side of the circular ring 41 is provided with a circular hole adapted to the rubber sleeve 422, both ends of the metal rods 421 are provided with arc grooves, the inner wall of the rubber sleeve 422 is provided with an anti-sliding block 423 extending to the inside of the arc groove, when in use, the cable temperature at the spontaneous combustion point of the cable rises, the metal rods 421 on both sides of the spontaneous combustion point are heated by the heat of the cable and the surrounding environment, and when the temperature of the metal rods 421 When the temperature rises to a certain level, the metal rod 421 melts the rubber sleeves 422 at both ends. The arc grooves at both ends of the metal rod 421 not only increase the firmness of the connection with the rubber sleeve 422 during normal use, but also speed up the speed of heat transfer to the rubber sleeve 422 when it is burned by spontaneous combustion. When the temperature of the metal rod 421 is high, the rubber sleeve 422 melts more quickly and falls off the cable, which can absorb the temperature of the cable surface and fall off the metal rod 421 after absorbing the heat at the burned part of the cable, thereby reducing the heat around the spontaneous combustion point of the cable and reducing the possibility of the heat of the cable at the spontaneous combustion point being transferred to both sides, resulting in excessive temperature and damage to the cables on both sides.

[0046] Reference Figure 1 Adjacent metal rods 421 are filled with filling strips 9 that are slidably connected to the inner sheath 3. The binding belt 5 is wrapped around the functional protection component 4 and the outside of the filling strips 9. The filling strips 9 filled between the metal rods 421 can make the outer circle of the functional protection component 4 smoother, eliminate the gaps between the metal rods 421, and facilitate covering the outer sheath 6 on the outside while preventing the inner side of the outer sheath 6 from being squeezed and deformed.

[0047] Embodiment 4

[0048] Reference Figure 1-Figure 9 On the basis of the first embodiment, the isolation layer 2 includes an inner shielding layer 21 sleeved on the outside of the conductor core 1, the outer sleeve of the inner shielding layer 21 is provided with an insulating layer 22, the outer sleeve of the insulating layer 22 is provided with an outer shielding layer 23, the outer sleeve of the outer shielding layer 23 is provided with a metal shielding layer 24, the inner center of the inner sheath 3 is provided with an insulating conductor bobbin 7, the inner sheath 3 is located outside the metal shielding layer 24 and is filled with a filler 8, the material of the inner sheath 3 is halogen-free low-smoke flame-retardant polyolefin, when in use, the inner shielding layer 21, the insulating layer 22, the outer shielding layer 23 and the metal shielding layer 24 wrapped layer by layer on the outside of the conductor core 1 can make the cable better transmit signals without being affected by the external environment, the insulating conductor bobbin 7 enhances the strength of the cable, the halogen-free low-smoke flame-retardant polyolefin inner sheath 3 improves the flame retardant ability of the cable, and the filler 8 achieves the same effect as the filling strip 9, making the overall outer ring formed by the multiple isolation layers 2 more flat while eliminating the gaps between the multiple isolation layers 2.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-smoke, halogen-free, flame-retardant cable, comprising a plurality of conductor cores (1), characterized in that: The conductor core (1) is sheathed with an isolation layer (2) on the outside, the multiple isolation layers (2) are sheathed with an inner sheath (3) on the outside, the inner sheath (3) is sheathed with a functional protection component (4) on the outside, a binding belt (5) is wrapped around the outside of the functional protection component (4), and the binding belt (5) is sheathed with an outer sheath (6) on the outside; The functional protection component (4) comprises a plurality of circular rings (41) sleeved on the outside of the inner sheath (3), a cooling component (42) is fixedly connected between two adjacent circular rings (41), and an isolation component (43) is installed on the outside of the circular rings (41) to prevent the ignition point from extending to both sides from the spontaneous combustion point of the cable; The isolation assembly (43) comprises a plurality of elastic plates (431) made of magnetic metal material fixedly connected to the circular ring (41); a limiting groove is provided on a side of the elastic plate (431) away from the circular ring (41); a rubber ring (432) extending into the limiting groove is sleeved on the outside of the plurality of elastic plates (431); a plurality of storage grooves are provided on the outside of the circular ring (41); magnetic balls (433) are filled in the storage grooves; and a rubber membrane (434) covering the storage grooves is fixedly connected to the outside of the circular ring (41).

2. The low-smoke halogen-free flame-retardant cable according to claim 1, characterized in that: The cooling assembly (42) comprises a plurality of metal rods (421) distributed between two circular rings (41); both ends of the metal rods (421) are sleeved with rubber sleeves (422); one end of the rubber sleeve (422) movably extends into the interior of the circular ring (41); a circular hole matching the rubber sleeve (422) is provided on one side of the circular ring (41); both ends of the metal rods (421) are sleeved with arc grooves; and an anti-sliding block (423) extending into the interior of the arc groove is provided on the inner wall of the rubber sleeve (422).

3. The low-smoke halogen-free flame-retardant cable according to claim 1, characterized in that: The circular ring (41) comprises a left half ring (411) and a right half ring (412); both ends of the left half ring (411) are provided with extension grooves, and both ends of the right half ring (412) are provided with extension blocks (413) that movably extend into the extension grooves.

4. The low-smoke halogen-free flame-retardant cable according to claim 3, characterized in that: An anti-slip strip (414) is fixedly connected to one end of the outer side of the left half ring (411) away from the elastic plate (431), and an anti-slip groove matching the anti-slip strip (414) is provided on the outer side of the extension block (413).

5. The low-smoke halogen-free flame-retardant cable according to claim 3, characterized in that: The inner walls of the left half ring (411) and the right half ring (412) are both provided with a plurality of folding grooves, and the circular ring (41) is made of metal.

6. The low-smoke halogen-free flame-retardant cable according to claim 1, characterized in that: The isolation layer (2) comprises an inner shielding layer (21) sleeved on the outside of the conductor core (1), an insulating layer (22) sleeved on the outside of the inner shielding layer (21), an outer shielding layer (23) sleeved on the outside of the insulating layer (22), and a metal shielding layer (24) sleeved on the outside of the outer shielding layer (23).

7. The low-smoke halogen-free flame-retardant cable according to claim 6, characterized in that: An insulated conductor bobbin (7) is provided at the inner center of the inner sheath (3), and a filler (8) is filled inside the inner sheath (3) outside the metal shielding layer (24).

8. The low-smoke halogen-free flame-retardant cable according to claim 1, characterized in that: The material of the inner sheath (3) is halogen-free, low-smoke, flame-retardant polyolefin.

9. The low-smoke halogen-free flame-retardant cable according to claim 2, characterized in that: Filling strips (9) slidably connected to the inner sheath (3) are filled between adjacent metal rods (421), and the binding belt (5) is wrapped around the outside of the functional protection component (4) and the filling strips (9).

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