Cable with fireproof function

Abstract

The invention discloses a cable with a fire-resistant function, and belongs to the technical field of cables, the cable comprises a cable, the upper end and the lower end of the cable are detachably connected with an upper connector and a lower connector respectively, the cable can be connected through mutual cooperation of the upper connector and the lower connector, the cable comprises a cable core with a conductive function, and the cable core is connected with the cable. And an insulating layer is wrapped outside the wire core. According to the invention, when the cable is burnt by fire or the cable is short-circuited to generate high temperature, a flame retardant in the fireproof channel is heated, the flame retardant expands along with the heating of the flame retardant, and part of the flame retardant enters the butt joint groove or the butt joint plug through the first one-way channel so as to break the negative pressure state in the butt joint groove; thus, the upper connector and the lower connector are separated, cable separation is completed, fire spreading is avoided, and then the locking sleeve is rotated to connect the connecting cylinder with the cable.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to a cable with fire resistance function. Background Art

[0002] Cable is a device for transmitting electric energy or signals, usually composed of several or several groups of wires. However, if a cable has a fire problem, the impact is serious, so the fire resistance of the cable is required to be high. In the event of a fire, it can prevent the fire from spreading and buy time for evacuation and fire fighting. At present, most fire-resistant cables on the market use composite materials to increase the fire resistance of the cables. Although this method can increase the fire resistance of the cables, various composite materials will also increase the weight of the cables, reduce the flexibility of the cables, make the cables difficult to shape, and seriously affect the installation efficiency.

[0003] A Chinese patent discloses a super flame retardant and fire resistant cable (authorization publication number CN118281641B). The connection device used in the patent can set a limit on the connection between the male connector and the female connector to avoid the male connector and the female connector from being separated when the super flame retardant and fire resistant cable is laid, thereby improving the stability of the connection. However, the connection of the above patent technology and the existing cable joints cannot be automatically separated when the cable is heated or burned by flames. When a fire or short circuit occurs in the cable, it will gradually spread along the cable. If it is not disconnected in time, the fire will expand. Therefore, the present invention provides a cable with fire resistance function to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a cable with fire resistance function to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A fire-resistant cable comprises a cable, wherein the upper and lower ends of the cable are detachably connected with an upper connector and a lower connector respectively, and the cable can be connected by the cooperation of the upper connector and the lower connector, and the cable comprises a wire core with a conductive function, the outside of the wire core is wrapped with an insulating layer, the outside of the insulating layer is wrapped with a shielding layer, the outside of the shielding layer is wrapped with a filling layer with a fire-resistant function, the outside of the filling layer is wrapped with a protective layer, the outside of the protective layer is wrapped with a fire-resistant layer, and a plurality of fire-resistant channels are opened inside the fire-resistant layer, and the fire-resistant channels are filled with flame retardants, and the fire resistance of the cable can be increased by the flame retardants.

[0006] As a further solution of the present invention, the upper connector and the lower connector both include a connecting cylinder, the lower end of the connecting cylinder is threadedly connected to a locking sleeve, the interior of the connecting cylinder is also fixedly connected to a fixing plate, and a clamping structure for clamping the wire core is rotatably connected below the fixing plate.

[0007] As a further solution of the present invention, the upper end of the fixed plate is slidably connected with a wrapping tube for docking and conducting, the outer wall of the wrapping tube is provided with a supporting spring for facilitating the resetting of the wrapping tube, the lower end of the wrapping tube is symmetrically fixedly connected with two conductive sleeves, and the conductive sleeves are connected to the clamping structure, thereby being used for transmitting current.

[0008] As a further solution of the present invention, the clamping structure includes two conductive clamps, which are rotatably connected to the connecting cylinder, and a torsion spring is provided at the rotating connection between the conductive clamp and the connecting cylinder to facilitate the resetting of the conductive clamp, and the upper ends of the conductive clamps are respectively in contact with two conductive sleeves, thereby facilitating the transmission of current.

[0009] As a further solution of the present invention, in order to increase the clamping degree of the conductive clamp on the wire core, the ends of the two conductive clamps close to each other are rotatably connected with a first slide bar and a second slide bar, respectively, the first slide bar and the second slide bar are arranged alternately in an X shape, and the first slide bar is slidably connected to the second slide bar.

[0010] As a further solution of the present invention, a pressure rod is movably connected above the connection between the first sliding rod and the second sliding rod, the pressure rod is located inside the wrapping tube, and a positioning frame is fixedly connected below the wrapping tube, the positioning frame is fixedly connected to the lower end of the fixing plate, the pressure rod is slidably connected to the positioning frame, and the lower end of the pressure rod is located below the positioning frame and is fixedly connected to a butt joint for pushing the first sliding rod and the second sliding rod.

[0011] As a further solution of the present invention, the outer diameter of the wrapping tube in the upper connecting head is larger than the outer diameter of the wrapping tube in the lower connecting head, and the outer walls of the fixed plates inside the upper connecting head and the lower connecting head are respectively fixedly connected with docking grooves and docking plugs, and the docking of the upper connecting head and the lower connecting head can be completed by inserting the docking plug into the docking groove.

[0012] As a further solution of the present invention, a plurality of third one-way channels are fixedly connected to the outer wall of the docking groove, and the docking plug includes a plug body, the interior of the plug body is hollow, and one end of the plug body away from the fixed plate is fixedly connected to a rubber plug, and the interior of the rubber plug is fixedly connected to a second one-way channel.

[0013] As a further solution of the present invention, a plurality of liquid adding pipes for adding flame retardant to the inside of the fire-resistant channel are fixedly connected to the outer wall of the fixed plate, the liquid adding pipes correspond to the fire-resistant channels respectively, and the liquid adding pipes include a tube body, an upper baffle ring is fixedly connected to the inside of the tube body, a dustproof plate is slidably connected to the inside of the upper baffle ring, a lower baffle ring is fixedly connected below the upper baffle ring, and a sealing ball is movably connected to the inside of the lower baffle ring.

[0014] As a further solution of the present invention, a push rod is fixedly connected between the dustproof plate and the sealing ball, a push spring is fixedly connected between the sealing ball and the tube body, and a first one-way channel is also fixedly connected to the outer wall of the tube body, the first one-way channel is connected to the docking groove, and only the air in the tube body is allowed to enter the docking groove through the first one-way channel.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. When the present invention is used, the docking plug is inserted into the docking groove when the upper connector and the lower connector are connected. When the docking plug is inserted into the docking groove, the rubber plug will slide in the docking groove. At this time, the air in the docking groove will be discharged to the outside through the third one-way channel. When the two connecting cylinders are docked with each other, negative pressure will be formed in the docking groove. The negative pressure in the docking groove will absorb the docking plug, so that the two connecting cylinders are close to each other and connected, thereby completing the connection between the upper connector and the lower connector, thereby completing the connection of the cable. In this way, the cable can be quickly connected.

[0016] 2. When the present invention is used, when the cable is burned by fire or the cable short-circuit generates high temperature, the flame retardant inside the fire-resistant channel will be heated. As the flame retardant is heated, the flame retardant will expand, and part of the combustion aid will enter the docking groove or the docking plug through the first one-way channel, thereby breaking the negative pressure state in the docking groove, and then separating the upper connector and the lower connector, completing the separation of the cables, preventing the spread of fire, and then rotating the locking sleeve to connect the connecting cylinder to the cable.

[0017] 3. When the present invention is used, after the connection is completed, the top rod is pressed to open the tube body, and then the flame retardant is added into the fire-resistant channel through the liquid adding pipe to increase the fire resistance of the cable.

[0018] 4. The present invention not only reduces the weight of the cable itself to facilitate the installation and transportation of the cable by opening a number of fire-resistant channels for storing flame retardants in the cable, but also reserves enough flame retardant storage space for the cable, so that more flame retardants can be stored in the cable, thereby greatly increasing the fire resistance of the cable. At the same time, the addition of flame retardants will not affect the flexibility of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of the structure of a cable with fire resistance function.

[0020] Figure 2 The figure is a cross-sectional view of a cable with fire resistance function.

[0021] Figure 3 This is a disassembled diagram of the upper and middle connector of a cable with fire-resistant function.

[0022] Figure 4 The figure is a cross-sectional view of a fire-resistant cable middle and upper connector.

[0023] Figure 5 This is a diagram of the internal structure of a fire-resistant cable middle and upper connector.

[0024] Figure 6 The present invention is a cross-sectional view of a liquid adding pipe in a cable having fire-resistant function.

[0025] Figure 7 It is a fire-resistant cable Figure 5 A magnified view of the structure at center.

[0026] Figure 8 The figure is a cross-sectional view of a pressure rod in a cable with fire resistance function.

[0027] Fig. 9 The present invention is a connection diagram of an upper connector and a lower connector in a cable with fire resistance function.

[0028] Fig.10 It is a fire-resistant cable Fig. 9 Enlarged view of the structure at point B in the middle.

[0029] Fig.11 The figure is a cross-sectional view of a cable with fire-resistant function.

[0030] In the figure: 1. upper connector; 2. cable; 3. lower connector; 4. clamping structure; 5. docking groove; 6. liquid filling pipe; 7. docking plug; 100, connecting cylinder; 101, locking sleeve; 102, shrinkage notch; 103, fixing plate; 104, conductive sleeve; 105, wrapping tube; 106, supporting spring; 107, baffle; 108, pressure rod; 109, abutment; 110, sliding notch; 111, connecting rod; 112, reset spring; 113, positioning frame; 200, wire core; 201, insulation layer; 202, shielding layer; 203, filling layer; 204, protective layer; 205, fire-resistant layer; 206, fire-resistant channel; 400, conductive clamp; 401, fixed rod; 402, first slide rod; 403, second slide rod; 404, sliding window; 405, sliding block; 406, compression spring; 600, tube body; 601, upper retaining ring; 602, lower retaining ring; 603, dustproof plate; 604, ejector rod; 605, blocking ball; 606, positioning column; 607, ejector spring; 608, first one-way channel; 700, plug body; 701, second one-way channel; 702, rubber plug; 703, third one-way channel. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1 , Figure 2 as well as Fig.11 In an embodiment of the present invention, a fire-resistant cable includes a cable 2, wherein the upper and lower ends of the cable 2 are detachably connected with an upper connector 1 and a lower connector 3, respectively, and the cable 2 can be connected by the cooperation between the upper connector 1 and the lower connector 3. The cable 2 includes a core 200 with a conductive function, and the core 200 is wrapped with an insulating layer 201 on the outside. The insulating layer 201 is made of polyvinyl chloride (PVC) material, and the insulating layer 201 is wrapped with a shielding layer 202 on the outside. The shielding layer 202 is a copper mesh, and the copper mesh can prevent and control signal interference. The shielding layer 202 is wrapped with a filling layer 203 with a fire-resistant function on the outside. The filling layer 203 is a fire-resistant fiber. The filling layer 203 can be used to fill the inside of the cable 2 to make its structure more compact and increase the fire resistance of the cable 2. The outside of the filling layer 203 is wrapped with a protective layer 204, which is also a PVC material. The outside of the protective layer 204 is wrapped with a fire-resistant layer 205, which is composed of polyvinyl chloride, aluminum hydroxide (ATH) and magnesium hydroxide (MH). The outside of the fire-resistant layer 205 is also coated with fire-resistant paint, and a number of fire-resistant channels 206 are opened inside the fire-resistant layer 205. The fire-resistant channels 206 are filled with flame retardants. The fire resistance of the cable 2 can be increased by the flame retardants. See also Figure 3-5, the upper connector 1 and the lower connector 3 both include a connecting cylinder 100, the lower end of the connecting cylinder 100 is threadedly connected with a locking sleeve 101, the cable 2 is inserted into the connecting cylinder 100 and then the locking sleeve 101 is rotated to lock the connecting cylinder 100 to the outside of the cable 2, specifically, a plurality of shrinkage notches 102 are provided on the outer wall of the connecting cylinder 100, and the locking sleeve 101 moves upward along the connecting cylinder 100 when it rotates, and the locking sleeve 101 compresses the shrinkage notch 102 as the locking sleeve 101 moves, so that the connecting cylinder 100 is tightly sleeved on the outside of the cable 2; A fixing plate 103 is also fixedly connected to the interior of the connecting cylinder 100, and a clamping structure 4 for clamping the wire core 200 is rotatably connected to the bottom of the fixing plate 103, and a wrapping tube 105 for docking and conducting is slidably connected to the upper end of the fixing plate 103, and two conductive sleeves 104 are symmetrically fixedly connected to the lower end of the wrapping tube 105, and the conductive sleeves 104 are connected to the clamping structure 4, and are used for current transmission; Specifically, a support spring 106 is sleeved on the outer wall of the wrapping tube 105 to facilitate the resetting of the wrapping tube 105. A baffle 107 is fixedly connected to the outer wall of the wrapping tube 105. The support spring 106 is located below the baffle 107. More specifically, one end of the support spring 106 is fixedly connected to the fixing plate 103, and the other end is fixedly connected to the baffle 107. See also Figure 4 , the clamping structure 4 includes two conductive clamping plates 400, the two conductive clamping plates 400 are rotatably connected to the connecting cylinder 100, and a torsion spring is provided at the rotatable connection between the conductive clamping plates 400 and the connecting cylinder 100 for facilitating the resetting of the conductive clamping plates 400. Specifically, two mounting grooves are provided on the inner wall of the connecting cylinder 100, and a fixing rod 401 is fixedly connected inside the mounting groove. The conductive clamping plates 400 are rotatably sleeved on the outside of the fixing rod 401, and the torsion spring is also sleeved on the outside of the fixing rod 401, and the upper ends of the conductive clamping plates 400 are respectively in contact with the two conductive sleeves 104, thereby facilitating the transmission of current. More specifically, a conductive copper sheet is fixedly connected to the inner lower end of the conductive sleeve 104, and the upper end of the conductive clamping plates 400 abuts against the bottom of the conductive copper sheet. More specifically, the wrapping tube 105, the conductive clamping plates 400 and the conductive copper sheet are all conductive; Please refer to Figure 4 , Figure 5 , Figure 7 as well as Figure 8In order to increase the clamping degree of the conductive clamping plate 400 on the wire core 200, the ends of the two conductive clamping plates 400 close to each other are rotatably connected to the first slide bar 402 and the second slide bar 403, the first slide bar 402 and the second slide bar 403 are staggered in an X shape, and the first slide bar 402 is slidably connected to the second slide bar 403. Specifically, a sliding window 404 is symmetrically opened on the outer wall of the second slide bar 403, and a sliding block 405 is slidably connected inside the sliding window 404. A rotating shaft is fixedly connected between the two sliding blocks 405, the first slide bar 402 is rotatably connected to the rotating shaft, and a compression spring 406 is also fixedly connected inside the sliding window 404; For details, please refer to Figure 4 A pressure rod 108 is movably connected above the connection between the first slide bar 402 and the second slide bar 403, and the pressure rod 108 is located inside the wrapping tube 105. A positioning frame 113 is fixedly connected below the wrapping tube 105. The positioning frame 113 is fixedly connected to the lower end of the fixing plate 103. The pressure rod 108 is slidably connected to the positioning frame 113, and the lower end of the pressure rod 108 is located below the positioning frame 113 and is fixedly connected to a butt joint 109 for pushing the first slide bar 402 and the second slide bar 403; In order to facilitate the return of the pressure rod 108, a return spring 112 is provided on the outer sleeve of the pressure rod 108 above the positioning frame 113. Figure 8 In order to prevent the pressure rod 108 from over-pushing the first slide bar 402 and the second slide bar 403, the pressure rod 108 includes an outer sleeve and an inner slide bar, and a transition spring is fixedly connected to the inside of the outer sleeve. When the pressure rod 108 cannot push the first slide bar 402 and the second slide bar 403, the outer sleeve will compress the transition spring; In order to increase the stability of the positioning frame 113, two sliding notches 110 are symmetrically opened on the outer wall of the wrapping tube 105, and the upper end of the positioning frame 113 is symmetrically fixedly connected with two connecting rods 111, and the two connecting rods 111 pass through the sliding notches 110 and are fixedly connected to the fixing plate 103. For details, please refer to Figure 4 .

[0033] Example 2: Please refer to Figure 3 , Figure 4 , Fig. 9 as well as Fig.10, the outer diameter of the wrapping tube 105 in the upper connector 1 is larger than the outer diameter of the wrapping tube 105 in the lower connector 3, and the outer walls of the fixing plates 103 inside the upper connector 1 and the lower connector 3 are respectively fixedly connected with a docking groove 5 and a docking plug 7, and the docking of the upper connector 1 and the lower connector 3 can be completed by inserting the docking plug 7 into the docking groove 5, and a plurality of third one-way channels 703 are fixedly connected on the outer wall of the docking groove 5, and the third one-way channels 703 allow the gas in the docking groove 5 to be discharged to the outside but prevent the outside air from entering the docking groove 5, and the docking plug 7 includes a plug body 700, the interior of the plug body 700 is hollow, and the end of the plug body 700 away from the fixing plate 103 is fixedly connected with a rubber plug 702, and the interior of the rubber plug 702 is fixedly connected with a second one-way channel 701, and the second one-way channel 701 only allows the air in the plug body 700 to flow to the outside; Example 3: Please refer to Figure 4-Figure 6 In combination with the examples 1 and 2, the outer wall of the fixed plate 103 is fixedly connected with a plurality of liquid adding pipes 6 for adding flame retardant to the inside of the fire-resistant channel 206, the liquid adding pipes 6 correspond to the fire-resistant channels 206 respectively, and the liquid adding pipes 6 include a pipe body 600, an upper retaining ring 601 is fixedly connected inside the pipe body 600, a dust plate 603 is slidably connected inside the upper retaining ring 601, a lower retaining ring 602 is fixedly connected below the upper retaining ring 601, a blocking ball 605 is movably connected inside the lower retaining ring 602, and a top rod 604 is fixedly connected between the dust plate 603 and the blocking ball 605 A pushing spring 607 is fixedly connected between the blocking ball 605 and the tube body 600. In order to ensure the stability of the blocking ball 605, a supporting mesh is fixedly connected to the inside of the tube body 600, and a positioning column 606 is fixedly connected to the upper end of the supporting mesh. The blocking ball 605 is slidably connected to the positioning column 606, and the pushing spring 607 is located outside the positioning column 606. A first one-way channel 608 is also fixedly connected to the outer wall of the tube body 600. The first one-way channel 608 is connected to the docking groove 5, and only the air in the tube body 600 is allowed to enter the docking groove 5 through the first one-way channel 608.

[0034] The working principle of the present invention is: When the present invention is used to connect the cable 2, the two ends of the cable 2 are first connected to the upper connector 1 and the lower connector 3 respectively. When connecting, the wrapping tube 105 is first pressed inward. When the wrapping tube 105 is pressed, the conductive clamping plate 400 is pushed to rotate through the conductive sleeve 104 to separate the two conductive clamping plates 400. Then the cable 2 is inserted into the connecting cylinder 100 and the wire core 200 is inserted between the two conductive clamping plates 400. When the wire core 200 enters between the two conductive clamping plates 400, the wrapping tube 105 is released. At this time, under the action of the torsion spring outside the fixing rod 401, the two conductive clamping plates 400 will approach each other and clamp the wire core 200. Then the locking sleeve 101 is rotated to connect the connecting cylinder 100 with the cable 2. After the connection is completed, the top rod 604 is pressed to open the tube body 600. Then the flame retardant is added to the fire-resistant channel 206 through the liquid adding pipe 6 to increase the fire resistance of the cable 2. When it is necessary to connect the cable 2 or to connect the cable 2 with other cables, the corresponding upper connector 1 or lower connector 3 is connected to the cable 2 or other cables. After the external connection is completed, the upper connector 1 is connected to the lower connector 3. When the upper connector 1 and the lower connector 3 are connected, the docking plug 7 is inserted into the docking groove 5. When the docking plug 7 is inserted into the docking groove 5, the rubber plug 702 will slide in the docking groove 5. At this time, the air in the docking groove 5 will be discharged to the outside through the third one-way channel 703. When the two connecting cylinders 100 are docked with each other, a negative pressure will be formed in the docking groove 5. The negative pressure in the fireproof channel 206 will absorb the docking plug 7, so that the two connecting cylinders 100 are close to each other and connected, thereby completing the connection between the upper connector 1 and the lower connector 3, thereby completing the connection of the cable 2. When the cable 2 is burned by fire or the cable 2 is short-circuited and generates high temperature, the flame retardant inside the fireproof channel 206 will be heated. As the flame retardant is heated, the flame retardant will expand, and part of the combustion aid will enter the docking groove 5 or the docking plug 7 through the first one-way channel 608, thereby breaking the negative pressure state in the docking groove 5, thereby separating the upper connector 1 and the lower connector 3, completing the separation of the cable 2, and preventing the spread of fire; When the upper connector 1 and the lower connector 3 are connected, the two pressure rods 108 will abut against each other, so that the abutting head 109 will tightly abut against the first slide bar 402 and the second slide bar 403, so that the two conductive clamps 400 have a force to approach each other, thereby increasing the tightness between the clamping structure 4 and the cable 2. As the upper connector 1 and the lower connector 3 approach each other, the two pressure rods 108 will compress the internal transition spring. When the negative pressure balance inside the docking groove 5 is broken, the upper connector 1 and the lower connector 3 will separate from each other under the action of the transition spring.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fire-resistant cable, comprising a cable (2), characterized in that: The upper and lower ends of the cable (2) are detachably connected to an upper connector (1) and a lower connector (3), respectively. The cable (2) can be connected by the cooperation of the upper connector (1) and the lower connector (3). The cable (2) comprises a wire core (200) having a conductive function. The wire core (200) is wrapped with an insulating layer (201) on the outside. The insulating layer (201) is wrapped with a shielding layer (202) on the outside. The shielding layer (202) is wrapped with a filling layer (203) having a fire-resistant function on the outside. The filling layer (203) is wrapped with a protective layer (204) on the outside. The protective layer (204) is wrapped with a fire-resistant layer (205) on the outside. The fire-resistant layer (205) is provided with a plurality of fire-resistant channels (206) on the inside. The fire-resistant channels (206) are filled with a flame retardant. The fire retardant can increase the fire resistance of the cable (2).

2. A fire-resistant cable according to claim 1, characterized in that: The upper connector (1) and the lower connector (3) both comprise a connecting cylinder (100), the lower end of the connecting cylinder (100) being threadedly connected to a locking sleeve (101), the interior of the connecting cylinder (100) being fixedly connected to a fixing plate (103), and a clamping structure (4) for clamping a wire core (200) being rotatably connected below the fixing plate (103).

3. A fire-resistant cable according to claim 2, characterized in that: The upper end of the fixed plate (103) is slidably connected to a wrapping tube (105) for docking and conducting electricity; a support spring (106) is sleeved on the outer wall of the wrapping tube (105) for facilitating the resetting of the wrapping tube (105); the lower end of the wrapping tube (105) is symmetrically fixedly connected to two conductive sleeves (104); and the conductive sleeves (104) are connected to a clamping structure (4), thereby being used for current transmission.

4. A fire-resistant cable according to claim 3, characterized in that: The clamping structure (4) comprises two conductive clamping plates (400), the two conductive clamping plates (400) being rotatably connected to the connecting cylinder (100), and a torsion spring for facilitating the resetting of the conductive clamping plates (400) is provided at the rotatable connection between the conductive clamping plates (400) and the connecting cylinder (100), and the upper ends of the conductive clamping plates (400) are respectively in contact with two conductive sleeves (104), thereby facilitating the transmission of current.

5. A fire-resistant cable according to claim 4, characterized in that: In order to increase the clamping degree of the conductive clamping plate (400) on the wire core (200), the ends of the two conductive clamping plates (400) close to each other are rotatably connected to a first slide bar (402) and a second slide bar (403), the first slide bar (402) and the second slide bar (403) are staggered in an X shape, and the first slide bar (402) is slidably connected to the second slide bar (403).

6. A fire-resistant cable according to claim 5, characterized in that: A pressure rod (108) is movably connected above the connection between the first sliding rod (402) and the second sliding rod (403), the pressure rod (108) is located inside the wrapping tube (105), and a positioning frame (113) is fixedly connected below the wrapping tube (105), the positioning frame (113) is fixedly connected to the lower end of the fixing plate (103), the pressure rod (108) is slidably connected to the positioning frame (113), and the lower end of the pressure rod (108) is located below the positioning frame (113) and is fixedly connected to a butt joint (109) for pushing the first sliding rod (402) and the second sliding rod (403).

7. A fire-resistant cable according to claim 3, characterized in that: The outer diameter of the wrapping tube (105) in the upper connector (1) is greater than the outer diameter of the wrapping tube (105) in the lower connector (3), and the outer walls of the fixing plates (103) inside the upper connector (1) and the lower connector (3) are respectively fixedly connected with a docking groove (5) and a docking plug (7), and the docking of the upper connector (1) and the lower connector (3) can be completed by inserting the docking plug (7) into the docking groove (5).

8. A fire-resistant cable according to claim 7, characterized in that: A plurality of third one-way channels (703) are fixedly connected to the outer wall of the docking groove (5); the docking plug (7) comprises a plug body (700); the interior of the plug body (700) is hollow; an end of the plug body (700) away from the fixing plate (103) is fixedly connected to a rubber plug (702); and the interior of the rubber plug (702) is fixedly connected to a second one-way channel (701).

9. A fire-resistant cable according to claim 8, characterized in that: A plurality of liquid adding pipes (6) for adding flame retardant to the interior of the fire-resistant passage (206) are fixedly connected to the outer wall of the fixed plate (103), the liquid adding pipes (6) respectively corresponding to the fire-resistant passages (206), and the liquid adding pipes (6) comprise a pipe body (600), an upper retaining ring (601) is fixedly connected to the interior of the pipe body (600), a dustproof plate (603) is slidably connected to the interior of the upper retaining ring (601), a lower retaining ring (602) is fixedly connected below the upper retaining ring (601), and a sealing ball (605) is movably connected to the interior of the lower retaining ring (602).

10. A fire-resistant cable according to claim 9, characterized in that: A push rod (604) is fixedly connected between the dustproof plate (603) and the blocking ball (605), a push spring (607) is fixedly connected between the blocking ball (605) and the tube body (600), and a first one-way channel (608) is also fixedly connected to the outer wall of the tube body (600), the first one-way channel (608) is connected to the docking groove (5), and only air in the tube body (600) is allowed to enter the docking groove (5) through the first one-way channel (608).

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