A fireproof cable for charging stations

Abstract

The present invention relates to a fireproof cable for charging stations applied in the field of cables. Two fusible areas are arranged on the cable body, and a ring sleeve, a telescopic sleeve, an anti-sagging sleeve and a connecting rope are arranged on the outside of the cable body to form a connection structure with fire resistance and surrounding effects. When a fire occurs in the cable body, the fuse is melted to achieve the disconnection of the main cable and the auxiliary cable. Subsequently, through the winding process of the connecting rope, the main cable and the auxiliary cable are further separated, so that the fire on the main cable is not easy to continue to spread to the electrical equipment on both sides, thereby effectively protecting the electrical equipment. Under the connection of the connecting rope and the surrounding effect of the anti-sagging sleeve, the disconnected and burning main cable is not easy to sag and cause the fire to be transmitted to other objects, thereby effectively reducing the hazard of fire spread. In addition, the smoke of the external fire source can enter the anti-sagging sleeve and be transmitted laterally along it, so that the smoke sensor can alarm in time, thereby providing an auxiliary monitoring means for the external fire source near the cable body.

Description

Technical Field

[0001] The present invention relates to a cable, and in particular to a fireproof cable for a charging station applied in the cable field. Background Art

[0002] New energy charging system technology is an essential technology for energy-saving, environmentally friendly and green travel vehicles that is currently being promoted in my country and developed by countries around the world. It is a facility that provides power charging services and is usually used to charge electric vehicles and hybrid vehicles.

[0003] For digital smart charging stations, the supporting multifunctional charging system cable products are indispensable products. However, due to the transmission of high-power current, the insulation material of the power supply conductor of the cable supporting products heats up during charging and ages, or it is very easy to cause spontaneous combustion due to short circuit, current overload, etc.

[0004] The specification of Chinese patent CN202211505672.9 discloses an environmentally friendly flame-retardant and fireproof intelligent cable. When a fire occurs on the cable body, the thermal wire transfers the temperature to the temperature measuring optical fiber, the electric valve closes, and the water in the hollow ring increases the force on the alloy sealing plug. The alloy sealing plug gradually melts and flushes the alloy sealing plug on the side close to the fire out of the injection nozzle. The water in the guide tube is ejected at high pressure through the injection nozzle, realizing autonomous and rapid fire extinguishing and effectively preventing the spread of fire.

[0005] However, the extent of a cable fire is difficult to predict. Although extinguishing the fire by delivering water through the cable itself can alleviate the fire, it may not completely extinguish the fire. The fire can easily spread along the cable to the electrical equipment on both sides of the cable, not only causing the electrical equipment to burn, but also easily causing the fire to expand. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that when a fire occurs in a cable, the fire easily spreads to the electrical equipment on both sides of the cable, which not only causes the electrical equipment to burn, but also easily causes the fire to expand.

[0007] In order to solve the above problems, the present invention provides a fireproof cable for a charging station, comprising a cable body electrically connected between a pair of electrical devices, the cable body comprising a main cable, a pair of auxiliary cables and a pair of fuses, the main cable is located between the pair of auxiliary cables, and the two are electrically connected through a pair of fuses, the pair of auxiliary cables are electrically connected to a pair of electrical devices, and a current sensor is electrically installed between the two;

[0008] The outer sleeve of the main cable is provided with an anti-droop sleeve, both ends of the anti-droop sleeve are fixedly connected with ring sleeves, the end of the ring sleeve away from the anti-droop sleeve is fixedly connected with a telescopic sleeve, the end of the telescopic sleeve away from the ring sleeve is fixedly connected with a positioning box, a pair of positioning boxes are respectively fixedly installed on a pair of electrical equipment, the telescopic sleeve and the positioning box are both sleeved on the outside of the cable body, a mesh plate is fixedly connected between the main cable and the inner wall of the ring sleeve, the ends of the pair of ring sleeves close to each other are fixedly connected with one end of a connecting rope, and the other ends of the pair of connecting ropes extend in the direction of approaching each other until they respectively move through the pair of ring sleeves and are respectively fixedly connected to the electric rotating shafts in a pair of rotating shaft boxes, and the pair of rotating shaft boxes are respectively fixedly installed on a pair of electrical equipment.

[0009] As a further supplement to the present application, the melt is located on the inner side of the ring sleeve, a heater is fixedly installed inside the ring sleeve, a heat-conducting ring in contact with the heater is fixedly connected to the inner wall of the ring sleeve, and a plurality of evenly distributed heat-conducting blocks are fixedly connected between the heat-conducting ring and the melt.

[0010] As a further supplement to the present application, a controller is installed inside the positioning box, and the controller includes a line current monitoring module, an auxiliary fuse module and a fire isolation module. The current sensor is electrically connected to the line current monitoring module, the electric shaft is electrically connected to the fire isolation module, and the heater is electrically connected to the auxiliary fuse module.

[0011] As another improvement of the present application, the connecting rope includes a rope core, the outer side of the rope core is provided with a mesh sleeve, and the space between the rope core and the mesh sleeve is filled with a hydraulic filler, and the outer surface of the mesh sleeve is fixedly provided with an outer sleeve.

[0012] As another improved supplement of the present application, the rope core is made of fire-retardant rope, the mesh sleeve is made of fire-proof cloth and its surface is provided with evenly distributed micropores, the hydraulic filler is made of a mixture of powdered hydraulic inorganic gelling material and water, and the outer sleeve is made of plastic material.

[0013] As a further supplement to the present application, a rope hole is provided on the ring sleeve for the connecting rope to pass through, and the rope hole is located on the inner side of the anti-droop sleeve. The anti-droop sleeve is provided with multiple evenly distributed smoke holes, and the anti-droop sleeve, the ring sleeve, the telescopic sleeve and the positioning box are interconnected.

[0014] As a further supplement to the present application, the telescopic sleeve includes a plurality of inner and outer sleeves, the outer ends of the sleeves except the outermost layer are fixedly connected with sliders, and the inner ends of the sleeves except the innermost layer are provided with sliding grooves for the sliders to slide.

[0015] A fireproof cable for a charging station, and a method for using the cable comprises the following steps:

[0016] W1. When the main cable is short-circuited or overloaded, the heat generated by the current change will cause the fuse to melt, and the circuit between the cable body and the electrical equipment will be disconnected. Before the fuse melts, the current data monitored by the current sensor will first show short-circuit current changes or overload current changes. After the fuse melts, the current decreases to zero.

[0017] When the controller receives the above current data changes, the fire prevention mode is turned on: the electric shafts in a pair of shaft boxes are started through the fire isolation module to reel in the connecting rope, drive a pair of rings to approach each other, and extend the telescopic sleeves, so that the main cable with the possibility of spontaneous combustion is away from the auxiliary cables and electrical equipment on both sides;

[0018] W2. When a fire occurs in the main cable without short circuit or overload, the cable body is disconnected from the electrical equipment circuit. At this time, the monitored current data gradually decreases to disappear, and there is no short circuit current or overload current change;

[0019] When the controller receives the above current data changes, it first starts the auxiliary fuse module to melt the fuse due to heat, and then turns on the fire protection mode. Its operation is the same as the fire protection mode in W1, so that the main cable where the fire is located is kept away from the secondary cables and electrical equipment on both sides.

[0020] As another improvement of the present application, a smoke sensor is fixedly connected inside the positioning box, the controller also includes a smoke sensing module and an alarm module, and the smoke sensor is electrically connected to the smoke sensing module.

[0021] A fireproof cable for a charging station, the method of using the cable also includes the following steps: when a smoke sensor detects the presence of smoke, a controller receives a change in smoke sensor data, activates an alarm module, and sends a danger warning to a monitoring center of the charging station, indicating that there may be a fire in the area where the cable body passes, so that staff can conduct on-site inspections in a timely manner.

[0022] In summary, the present application forms a fire-resistant and enclosing connection structure on the outside of the cable body by setting two fusible areas on the cable body, and setting a ring sleeve, a telescopic sleeve, an anti-sagging sleeve and a connecting rope. When a fire occurs on the cable body, the main cable and the auxiliary cable are disconnected by the melting of the fuse. Subsequently, the main cable and the auxiliary cable are further separated by the winding process of the connecting rope, so that the fire on the main cable is not easy to continue to spread to the electrical equipment on both sides, thereby protecting the equipment. Moreover, under the connection of the connecting rope and the enclosing effect of the anti-sagging sleeve, a pair of ring sleeves remain connected, and the disconnected and burning main cable is not easy to sag and cause the fire to be transferred to other objects, effectively reducing the hazard of fire spread. In addition, through the setting of the smoke hole on the anti-sagging sleeve, the smoke from the external fire source can enter the anti-sagging sleeve and be transmitted horizontally along the area between the anti-sagging sleeve and the cable body, so that the smoke sensor detects the smoke signal and alarms in time, thereby providing an auxiliary monitoring means for external fire sources in the area where the cable body passes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The first embodiment of the present application is a three-dimensional Figure 1 ;

[0024] Figure 2 The first embodiment of the present application is a three-dimensional Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the side structure of the first embodiment of the present application. Figure 1 ;

[0026] Figure 4 This is a schematic diagram of the side structure of the first embodiment of the present application. Figure 2 ;

[0027] Figure 5 This is a side structural schematic diagram of the fire prevention process in the first embodiment of the present application;

[0028] Figure 6 This is a schematic diagram of the side structure of the first embodiment of the present application. Figure 3 ;

[0029] Figure 7 This is a schematic diagram of the front structure of the ring sleeve in the first embodiment of the present application;

[0030] Figure 8 This is a schematic diagram of the side structure of the telescopic sleeve in the first embodiment of the present application;

[0031] Fig. 9 This is a front structural schematic diagram of the connecting rope according to the second embodiment of the present application;

[0032] Fig.10 This is a three-dimensional diagram of the third embodiment of the present application;

[0033] Fig.11 This is a side structural schematic diagram of the third implementation mode of the present application;

[0034] Fig.12 This is a partial side structural schematic diagram of the third implementation mode of the present application;

[0035] Fig.13 This is a system diagram of this application.

[0036] Description of the numbers in the figure:

[0037] 1 cable body, 101 main cable, 102 auxiliary cable, 103 melt, 2 ring sleeve, 201 rope hole, 3 telescopic sleeve, 31 casing, 32 slider, 33 slide groove, 4 positioning box, 5 shaft box, 6 anti-sagging sleeve, 601 smoke hole, 7 connecting rope, 701 rope core, 702 hydraulic filler, 703 mesh sleeve, 704 outer sleeve, 8 controller, 9 mesh plate, 10 smoke sensor, 11 heater, 12 thermal conductive ring, 13 thermal conductive block. DETAILED DESCRIPTION

[0038] The following is a detailed description of three implementation methods of the present application in conjunction with the accompanying drawings.

[0039] The first implementation method:

[0040] The present invention provides a fireproof cable for a charging station, see Figure 1-3 , including electrical connection to a pair of electrical devices (such as Figure 3 The cable body 1 comprises a main cable 101, a pair of auxiliary cables 102 and a pair of fuses 103. The main cable 101 is located between the pair of auxiliary cables 102, and the two are electrically connected through a pair of fuses 103. The material of the fuse 103 is the same as the melt material in the existing fuse, such as lead alloy. The pair of auxiliary cables 102 are electrically connected to a pair of electrical equipment, and current sensors (not shown in the figure) are electrically installed between the two. There is a pair of current sensors, one connected between the device A and the left auxiliary cable 102, and the other connected between the device B and the right auxiliary cable 102. The function of both of them is to monitor the change of current value between the auxiliary cable 102 and the electrical equipment.

[0041] Combination Figure 3 and Figure 4, the outer side of the main cable 101 is provided with an anti-drooping sleeve 6, both ends of the anti-drooping sleeve 6 are fixedly connected with a ring sleeve 2, the end of the ring sleeve 2 away from the anti-drooping sleeve 6 is fixedly connected with a telescopic sleeve 3, the end of the telescopic sleeve 3 away from the ring sleeve 2 is fixedly connected with a positioning box 4, a pair of positioning boxes 4 are respectively fixedly installed on a pair of electrical equipment, the telescopic sleeve 3 and the positioning box 4 are both sleeved on the outer side of the cable body 1, a mesh plate 9 is fixedly connected between the inner wall of the main cable 101 and the ring sleeve 2, the ends of the pair of ring sleeves 2 close to each other are fixedly connected with one end of a connecting rope 7, the other ends of the pair of connecting ropes 7 extend in a direction close to each other until they are respectively movably passed through a pair of ring sleeves 2 and are respectively fixedly connected to the electric shafts in a pair of rotating shaft boxes 5, a pair of rotating shaft boxes 5 are respectively fixedly installed on a pair of electrical equipment, a rope hole 201 is opened on the ring sleeve 2 for the connecting rope 7 to pass through, and the rope hole 201 is located on the inner side of the anti-drooping sleeve 6, and the anti-drooping sleeve 6, the ring sleeve 2, the telescopic sleeve 3 and the positioning box 4 are more than one.

[0042] The anti-sagging sleeve 6 can be made of fireproof cloth material, such as glass fiber, the connecting rope 7 can be made of fire-retardant rope, and the ring sleeve 2, the telescopic sleeve 3 and the mesh plate 9 can be made of flame-retardant or non-combustible materials, such as ceramics and gypsum boards.

[0043] A controller 8 is installed inside a pair of positioning boxes 4, that is, the number of controllers 8 is the same as that of current sensors, which are also a pair. During setting, the current sensor and the electric shaft on device A are electrically connected to the controller 8 in the positioning box 4 on device A, and the current sensor and the electric shaft on device B are electrically connected to the controller 8 in the positioning box 4 on device B, which facilitates data transmission; specifically, the controller 8 includes a line current monitoring module, an auxiliary fuse module and a fire isolation module, the current sensor is electrically connected to the line current monitoring module, and the electric shaft is electrically connected to the fire isolation module.

[0044] See also Figure 6 and Figure 7 The melt 103 is located on the inner side of the ring sleeve 2, a heater 11 is fixedly installed inside the ring sleeve 2, the heater 11 is electrically connected to the auxiliary fuse module, a heat-conducting ring 12 in contact with the heater 11 is fixedly connected to the inner wall of the ring sleeve 2, and a plurality of evenly distributed heat-conducting blocks 13 are fixedly connected between the heat-conducting ring 12 and the melt 103.

[0045] See also Figure 8 The telescopic sleeve 3 includes a plurality of sleeves 31 arranged inside and outside. The outer ends of the remaining sleeves 31 except the outermost layer are fixedly connected with sliders 32, and the inner ends of the remaining sleeves 31 except the innermost layer are provided with sliding grooves 33 for the sliders 32 to slide, so that the telescopic sleeve 3 has the function of free telescopic expansion and contraction. Figure 3 As shown, when the melt 103 is in a normal solid state, the telescopic sleeve 3 is in a contracted state and connected between the ring sleeve 2 and the positioning box 4. Figure 5As shown, when the fire protection mode is activated, the telescopic sleeve 3 is extended under the drive of the ring sleeve 2, so that the main cable 101 and the auxiliary cable 102 are smoothly separated.

[0046] A fireproof cable for a charging station, and a method for using the cable comprises the following steps:

[0047] W1. When the main cable 101 is short-circuited or overloaded, the heat generated by the current change will cause the fuse 103 to melt (this is the working principle of the existing fuse), and the circuit between the cable body 1 and the electrical equipment is disconnected. Before the fuse 103 melts, the current data monitored by the current sensor first shows a short-circuit current change or an overload current change. After the fuse 103 melts, the current decreases to zero.

[0048] When the controller 8 receives the above current data change, the fire prevention mode is turned on: the electric shafts in the pair of shaft boxes 5 are started through the fire isolation module to reel in the connecting rope 7, drive the pair of rings 2 to approach each other, and extend the telescopic sleeve 3, so that the main cable 101 with the possibility of spontaneous combustion is away from the auxiliary cables 102 and electrical equipment (such as Figure 5 shown);

[0049] W2. When a fire occurs in the main cable 101 without short circuit or overload, the cable body 1 is disconnected from the circuit of the electrical equipment. At this time, the monitored current data gradually decreases to disappear, and there is no short circuit current or overload current change;

[0050] When the controller 8 receives the above-mentioned current data change, it first starts the auxiliary fuse module to make the fuse 103 melt due to heat, and then starts the fire protection mode. Its operation is the same as the fire protection mode in W1, so that the main cable 101 where there is fire is kept away from the auxiliary cables 102 and electrical equipment on both sides.

[0051] There are many factors that may cause cable fires, such as line short circuit, overload, excessive local resistance, external fire source, etc. Therefore, the present application considers two fire situations: one is a short circuit or overcurrent that generates a lot of heat and causes the fuse to disconnect, such as step W1. When this type of circuit fault occurs, the fuse 103 directly melts, and the main cable 101 and the auxiliary cable 102 are disconnected. The other is other factors that do not generate a lot of heat, such as step W2. This type of situation causes the cable to be disconnected and the fuse 103 fails to melt. At this time, the auxiliary fuse module is required to actively heat and melt the fuse 103 to disconnect the main cable 101 and the auxiliary cable 102. It is determined whether to use the auxiliary fuse. The module method is: the current change data between the cable body 1 and a pair of devices are collected through the current sensor. After monitoring the circuit current disconnection, the collected current change data is compared with the short-circuit current range value and the overload current range value that will cause the fuse 103 to blow, which are pre-stored in the controller 8. If there is an identical current change, it indicates that there is a corresponding short circuit or overcurrent situation, and you can choose not to use the auxiliary fuse module (that is, perform step W1, but choosing to use the auxiliary fuse module will not affect it, and it can further ensure the blowing of the fuse 103). On the contrary, if there is no identical current change, you must perform step W2 to blow the fuse 103.

[0052] After the fuse 103 is melted and the fire protection mode is entered, on the one hand, the main cable 101 where fire is possible is separated from the auxiliary cable 102, and at the same time, the ring sleeve 2 and the telescopic sleeve 3 have flame retardant properties. When the fire on the main cable 101 reaches the ring sleeve 2, it is not easy to continue to spread to the electrical equipment on both sides, thereby protecting the equipment. On the other hand, after the main cable 101 is burned, due to the connection function and flame retardant performance of the connecting rope 7, as well as the flame retardant performance of the anti-sagging sleeve 6 and the surrounding effect on the main cable 101, the pair of ring sleeves 2 remain connected, and the disconnected and burning main cable 101 is not easy to sag and transfer the fire to other objects, thereby effectively reducing the hazard of fire spread.

[0053] Second implementation method:

[0054] This embodiment is based on the embodiment 1, and the structure of the connecting rope 7 is specifically set as follows: Fig. 9 The connecting rope 7 includes a rope core 701, a mesh sleeve 703 is provided on the outer side of the rope core 701, and a hydraulic filler 702 is filled between the rope core 701 and the mesh sleeve 703, an outer surface fixed sleeve 704 is provided on the outer surface of the mesh sleeve 703, the rope core 701 is made of fire-retardant rope, the mesh sleeve 703 is made of fire-proof cloth and its surface is provided with uniformly distributed micropores, the hydraulic filler 702 is made of a mixture of powdered hydraulic inorganic gelling material and water, and the outer sleeve 704 is made of plastic material, such as polyethylene.

[0055] When there is a fire on the main cable 101, the fire will burn to the connecting rope 7, and the outer sleeve 704 will melt first under high temperature, exposing the mesh sleeve 703 and the hydraulic filler 702, so that the hydraulic filler 702 loses moisture and solidifies under the action of the fire, forming a hard fireproof layer, protecting the outside of the rope core 701, providing further protection for it, so that the connecting rope 7 can support and connect the pair of ring sleeves 2 for a longer time, and reduce the sagging of the cable body 1.

[0056] The third implementation method:

[0057] This embodiment adds the following structure based on the embodiment 1 or the embodiment 2: Figure 10-13 A smoke sensor 10 is fixedly connected to the interior of the positioning box 4. The controller 8 also includes a smoke sensing module and an alarm module. The smoke sensor 10 is electrically connected to the smoke sensing module. A plurality of evenly distributed smoke holes 601 are provided on the anti-droop sleeve 6. The smoke holes 601 facilitate the smoke from the external fire source to enter the anti-droop sleeve 6 and to be transmitted laterally along the area between the anti-droop sleeve 6 and the cable body 1 until it is transmitted to the positioning box 4 on one side and the smoke signal is detected by the smoke sensor 10.

[0058] Therefore, through the above-mentioned structural setting, a method for using a fire-proof cable for a charging station also includes the following steps: when a smoke sensor 10 detects the presence of smoke, the controller 8 receives the data change of the smoke sensor 10, starts the alarm module, and sends a danger warning to the charging station monitoring center, indicating that there is a possibility of fire in the area where the cable body 1 passes, so that the staff can conduct on-site inspections in time. Through the above process, an auxiliary monitoring means is provided for the timely discovery of external fire sources, which facilitates timely and effective handling of fires and reduces fire losses.

[0059] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A fireproof cable for a charging station, comprising a cable body (1) electrically connected between a pair of electrical devices, characterized in that: The cable body (1) comprises a main cable (101), a pair of auxiliary cables (102) and a pair of fuses (103); the main cable (101) is located between the pair of auxiliary cables (102), and the two are electrically connected through a pair of fuses (103); the pair of auxiliary cables (102) are electrically connected to a pair of electrical equipment, and a current sensor is electrically installed between the two; The outer sleeve of the main cable (101) is provided with an anti-droop sleeve (6), both ends of the anti-droop sleeve (6) are fixedly connected to a ring sleeve (2), one end of the ring sleeve (2) away from the anti-droop sleeve (6) is fixedly connected to a telescopic sleeve (3), one end of the telescopic sleeve (3) away from the ring sleeve (2) is fixedly connected to a positioning box (4), a pair of positioning boxes (4) are respectively fixedly installed on a pair of electrical equipment, the telescopic sleeve (3) and the positioning box (4) are both sleeved on the outer side of the cable body (1), a mesh plate (9) is fixedly connected between the main cable (101) and the inner wall of the ring sleeve (2), one end of the pair of ring sleeves (2) close to each other is fixedly connected to one end of a connecting rope (7), the other ends of the pair of connecting ropes (7) extend in a direction of approaching each other until they are respectively movable through the pair of ring sleeves (2) and are respectively fixedly connected to the electric shafts in a pair of shaft boxes (5), and the pair of shaft boxes (5) are respectively fixedly installed on a pair of electrical equipment; The melt (103) is located on the inner side of the annular sleeve (2), a heater (11) is fixedly installed inside the annular sleeve (2), a heat-conducting ring (12) in contact with the heater (11) is fixedly connected to the inner wall of the annular sleeve (2), and a plurality of evenly distributed heat-conducting blocks (13) are fixedly connected between the heat-conducting ring (12) and the melt (103); A controller (8) is installed inside the positioning box (4), and the controller (8) includes a line current monitoring module, an auxiliary fuse module and a fire isolation module. The current sensor is electrically connected to the line current monitoring module, the electric shaft is electrically connected to the fire isolation module, and the heater (11) is electrically connected to the auxiliary fuse module.

2. A fireproof cable for a charging station according to claim 1, characterized in that: The connecting rope (7) comprises a rope core (701), the outer side of the rope core (701) is provided with a mesh sleeve (703), a hydraulic filler (702) is filled between the rope core (701) and the mesh sleeve (703), and an outer layer sleeve (704) is fixedly provided on the outer surface of the mesh sleeve (703).

3. A fireproof cable for a charging station according to claim 2, characterized in that: The rope core (701) is made of fireproof and flame-retardant rope, the net sleeve (703) is made of fireproof cloth and has evenly distributed micropores on its surface, the hydraulic filler (702) is made of a mixture of powdered hydraulic inorganic gelling material and water, and the outer sleeve (704) is made of plastic material.

4. A fireproof cable for a charging station according to claim 1, characterized in that: The ring sleeve (2) is provided with a rope hole (201) for the connecting rope (7) to movably pass through, and the rope hole (201) is located on the inner side of the anti-droop sleeve (6). The anti-droop sleeve (6) is provided with a plurality of evenly distributed smoke holes (601). The anti-droop sleeve (6), the ring sleeve (2), the telescopic sleeve (3) and the positioning box (4) are interconnected.

5. A fireproof cable for a charging station according to claim 1, characterized in that: The telescopic sleeve (3) comprises a plurality of sleeves (31) arranged inside and outside each other, the outer ends of the sleeves (31) except the outermost layer are fixedly connected to sliders (32), and the inner ends of the sleeves (31) except the innermost layer are provided with sliding grooves (33) for the sliders (32) to slide.

6. A fireproof cable for a charging station according to claim 1, characterized in that: The method of use includes the following steps: W1. When the main cable (101) is short-circuited or overloaded, the heat generated by the current change will cause the fuse (103) to melt, and the circuit between the cable body (1) and the electrical equipment will be disconnected. Before the fuse (103) melts, the current data monitored by the current sensor first shows a short-circuit current change or an overload current change. After the fuse (103) melts, the current decreases to zero. When the controller (8) receives the above-mentioned current data change, the fire prevention mode is turned on: the electric shafts in a pair of shaft boxes (5) are started through the fire prevention isolation module, so that the electric shafts are reeled in the connecting rope (7), driving the pair of ring sleeves (2) to approach each other, and the telescopic sleeve (3) is extended, so that the main cable (101) with the possibility of spontaneous combustion is away from the auxiliary cables (102) and electrical equipment on both sides; W2. When a fire occurs in the main cable (101) without short circuit or overload, the cable body (1) is disconnected from the circuit of the electrical equipment. At this time, the monitored current data gradually decreases to disappear, and there is no short circuit current or overload current change; When the controller (8) receives the above-mentioned current data change, it first starts the auxiliary fuse module to heat and melt the fuse (103), and then starts the fire protection mode. Its operation is the same as the fire protection mode in W1, so that the main cable (101) where the fire occurs is kept away from the auxiliary cables (102) and electrical equipment on both sides.

7. A fireproof cable for a charging station according to claim 6, characterized in that: A smoke sensor (10) is fixedly connected inside the positioning box (4), and the controller (8) further comprises a smoke sensing module and an alarm module, and the smoke sensor (10) is electrically connected to the smoke sensing module.

8. A fireproof cable for a charging station according to claim 7, characterized in that: The method of use also includes the following steps: when a certain smoke sensor (10) detects the presence of smoke, the controller (8) receives the data change of the smoke sensor (10), activates the alarm module, and sends a danger warning to the charging station monitoring center, indicating that there is a possibility of fire in the area where the cable body (1) passes, so that the staff can conduct on-site inspection in time.

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