Low smoke zero halogen flame retardant fire resistant branch cable

Abstract

The application discloses a low-smoke halogen-free flame-retardant fire-resistant branch cable and relates to the technical field of branch cables.The low-smoke halogen-free flame-retardant fire-resistant branch cable comprises two cable bodies and an insulating block, a protection mechanism is arranged between the two cable bodies, the protection mechanism comprises a double-hole frame, a main protection shell and an auxiliary protection shell, two housings are fixed to the surface of the main protection shell, and a plug rod is fixed to penetrate the inner surface of the double-hole frame. The protection mechanism can protect the "Y-shaped branch" at the branch joint of the low-smoke halogen-free flame-retardant fire-resistant branch cable, avoid the deformation or breakage of the joint due to the accidental falling of building materials, the collision of tools, the misoperation and pulling of construction personnel and the extrusion of other objects, ensure the normal power supply of the cable, promote the smooth progress of construction, and improve the use effect of the low-smoke halogen-free flame-retardant fire-resistant branch cable.

Description

A low-smoke, halogen-free, flame-retardant, and fire-resistant branch cable Technical Field

[0001] This invention relates to the field of branch cable technology, specifically to a low-smoke, halogen-free, flame-retardant, and fire-resistant branch cable. Background Technology

[0002] Branch cables are a type of high-efficiency cable system composed of main cables and branch cables. By setting branch joints at specific intervals and using specific processes on the main cable, electrical energy is precisely distributed to branch lines, providing stable power supply to various electrical devices. With the rapid development of industrial production and the continuous advancement of urban construction, electrical scenarios are becoming increasingly complex, and fire hazards are increasing accordingly. Traditional cables often release large amounts of dense smoke and toxic halogen gases during fires, which not only obstructs the rescuer's vision but also causes serious injury to rescuers. Therefore, in order to improve the safety and reliability of power systems under fire conditions and meet the stringent fire safety requirements of modern engineering, low-smoke halogen-free flame-retardant and fire-resistant branch cables are widely used.

[0003] Currently, existing low-smoke halogen-free flame-retardant and fire-resistant branch cables have the following shortcomings:

[0004] When low-smoke halogen-free flame-retardant fire-resistant branch cables are exposed to complex construction environments for extended periods, the "Y-shaped junctions" at their branch joints are prone to deformation or breakage due to accidental falling building materials, tool collisions, misoperation by construction workers, or compression from other objects. This can affect the normal power supply of the cable, leading to delays in construction progress and further reducing the effectiveness of the low-smoke halogen-free flame-retardant fire-resistant branch cables.

[0005] Therefore, we propose a low-smoke, halogen-free, flame-retardant, and fire-resistant branch cable to address the problems mentioned in the background section. Summary of the Invention

[0006] The purpose of this invention is to provide a low-smoke halogen-free flame-retardant fire-resistant branch cable. By setting up a protective mechanism, the "Y-shaped fork" at the branch joint of the low-smoke halogen-free flame-retardant fire-resistant branch cable can be protected, avoiding deformation or breakage at the joint due to accidental falling building materials, collisions with tools, misoperation and pulling by construction personnel, or compression by other objects. This ensures the normal power supply of the cable and promotes the smooth progress of construction, thereby improving the performance of the low-smoke halogen-free flame-retardant fire-resistant branch cable and solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a low-smoke halogen-free flame-retardant and fire-resistant branch cable, comprising two cable bodies and a single insulating block, wherein the insulating block is injection molded and fixed on the outside of the two cable bodies, and a protective mechanism is provided between the two cable bodies for protection at the connection point of the two cable bodies.

[0008] The protective mechanism includes a double-hole frame, a main protective shell, and a secondary protective shell. Two shells are fixed between adjacent main and secondary protective shells. A rod is connected to the inner side of the double-hole frame. A circular block is rotatably disposed inside the shell. A circular rod is sleeved on the axis of each circular block. A perforated block is fixed to one end of each circular rod away from the circular block. A spring is sleeved on the outer periphery of the circular rod. The secondary protective shell has multiple rectangular holes for fitting the shell.

[0009] Preferably, the main protective shell has two first grooves, the secondary protective shell has two second grooves, anti-slip pads are provided in both the first and second grooves, each perforated block is bonded to one side of the perforated sealing block, a tubular sponge block is bonded to the other side of each perforated sealing block, and a sealing pad is bonded to the bottom of each annular block.

[0010] Preferably, the main protective shell is connected to the secondary protective shell, and the side of both the main and secondary protective shells near the double-hole frame abuts against the far end of the double-hole frame. The insertion rod passes through each shell and is connected to the far end of the double-hole frame.

[0011] Preferably, the insertion rod passes through one side of the secondary protective shell, and the insertion rod sequentially passes through each rectangular hole and extends out from the other side of the secondary protective shell; each shell respectively mates with the rectangular hole.

[0012] Preferably, one end of the spring abuts against the inner side of each perforated block, the other end of the spring abuts against each annular block, and the other end of each rod away from the annular block passes through the insert rod.

[0013] Preferably, the tubular sponge block is disposed inside the housing, with one end of the tubular sponge block near the perforated block extending into the perforated sealing block, the inner wall of each tubular sponge block contacting the outer side of each spring, and the other end of each round rod penetrating the sealing gasket.

[0014] Preferably, the outer surface of the sealing gasket contacts the inner wall of each housing, the side of the perforated sealing block away from the perforated block abuts against the housing, and one side of the insulating block is fixed to the other side of the double-hole frame.

[0015] Preferably, each of the cable bodies includes a sheath layer and two shielding layers, the inner wall of each sheath layer is provided with a flame-retardant layer, the inner wall of each flame-retardant layer is provided with a fire-resistant layer, and the inner wall of each fire-resistant layer is provided with a wrapping layer.

[0016] Preferably, each of the shielding layers has an insulating layer on its inner wall, and each insulating layer has a conductive core inside it. The four shielding layers are divided into two groups, and a filling layer is provided between each wrapping layer and each group of shielding layers.

[0017] Preferably, the two sheath layers are respectively disposed inside the two round holes of the double-hole frame, and the four anti-slip pads are divided into two groups, with the portion of each sheath layer extending into the double-hole frame in contact with the anti-slip pad.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] (I) By setting up a protective mechanism, this invention can protect the "Y-shaped fork" at the branch joint of the low-smoke halogen-free flame-retardant fire-resistant branch cable, avoiding deformation or breakage at the joint due to accidental falling of building materials, collision of tools, misoperation and pulling by construction personnel, or squeezing by other objects, thereby ensuring the normal power supply of the cable and promoting the smooth progress of construction. This improves the performance of the low-smoke halogen-free flame-retardant fire-resistant branch cable. When it is necessary to separate the main protective shell and the secondary protective shell from the double-hole frame, the cooperation of two movable perforated blocks, two shells and two ring blocks can be used to move the two round rods, two perforated sealing blocks and two tubular sponge blocks, while stretching the two springs.

[0020] (ii) The present invention then utilizes the cooperation of two moved round rods to separate the insert rod from the two housings. Then, by utilizing the cooperation of the moved main protective housing, two rectangular holes, and two housings, the main protective housing and the secondary protective housing can be separated from the double-hole frame. When it is necessary to reset the main protective housing and the secondary protective housing to their original positions, the above-mentioned components can be reversed. At this time, by utilizing the cooperation of the main protective housing, the secondary protective housing, the double-hole frame, the insert rod, the two housings, the two first grooves, the two second grooves, the two sets of anti-slip pads, and the two rectangular holes, the "Y-shaped fork" at the branch joint of the low-smoke halogen-free flame-retardant fire-resistant branch cable can be protected.

[0021] (III) By setting two cable bodies and insulation blocks, this invention can form a low-smoke halogen-free flame-retardant and fire-resistant branch cable, thereby achieving precise distribution of electrical energy to the branch lines and providing stable power supply to various electrical equipment. Under the action of the sheath layer, the tensile strength and tear resistance of the cable body can be enhanced, thereby protecting the internal structure of the cable body from damage. Under the action of the flame-retardant layer, the spread and propagation of flames can be effectively prevented, thereby buying more time for personnel evacuation and fire rescue, and thus reducing the losses caused by fire. Under the action of the fire-resistant layer, flames and heat can be effectively blocked, so that the internal temperature of the cable body rises slowly, thereby ensuring that the cable body works normally for a certain period of time.

[0022] (iv) The present invention, through the action of the wrapping layer, makes the cable body less susceptible to the influence of the external environment, thereby extending the service life of the cable body; through the action of the conductor core, it can reduce the loss of electrical energy during transmission and improve the power transmission efficiency of the cable body; through the action of the insulation layer, it can effectively prevent leakage and short circuit, thereby ensuring the stability and reliability of power transmission of the cable body during long-term operation; through the action of the shielding layer, it can effectively suppress external electromagnetic interference, ensuring the stability and accuracy of signal transmission of the cable body; through the action of the filling layer, it can increase the overall mechanical strength of the cable body and protect its internal conductors and insulation layers from external damage. Attached Figure Description

[0023] Figure 1 is a perspective view of a low-smoke halogen-free flame-retardant and fire-resistant branch cable of the present invention;

[0024] Figure 2 is a perspective view of a low-smoke halogen-free flame-retardant fire-resistant branch cable according to the present invention from another angle.

[0025] Figure 3 is a perspective view of the cable body of a low-smoke halogen-free flame-retardant and fire-resistant branch cable according to the present invention.

[0026] Figure 4 is a partial sectional perspective view of the protective mechanism of a low-smoke halogen-free flame-retardant and fire-resistant branch cable of the present invention.

[0027] Figure 5 is a schematic diagram of the cable body structure of a low-smoke halogen-free flame-retardant and fire-resistant branch cable according to the present invention.

[0028] Figure 6 is a perspective cross-sectional view of the protective mechanism of a low-smoke halogen-free flame-retardant and fire-resistant branch cable of the present invention from another angle.

[0029] Figure 7 is a perspective view of the protective mechanism of a low-smoke halogen-free flame-retardant and fire-resistant branch cable according to the present invention.

[0030] Figure 8 is a perspective view of another angle of the protective mechanism of a low-smoke halogen-free flame-retardant and fire-resistant branch cable of the present invention.

[0031] Figure 9 is an enlarged perspective view of point A in Figure 6 of the present invention, which is a low-smoke halogen-free flame-retardant and fire-resistant branch cable.

[0032] Figure 10 is an exploded view of the protective mechanism of a low-smoke halogen-free flame-retardant and fire-resistant branch cable according to the present invention.

[0033] In the diagram: 1. Cable body; 101. Sheath layer; 102. Flame retardant layer; 103. Fire resistant layer; 104. Wrapping layer; 105. Shielding layer; 106. Conductor core; 107. Insulation layer; 108. Filler layer; 2. Protective mechanism; 201. Double-hole frame; 202. Main protective shell; 203. Secondary protective shell; 204. Shell; 205. Insert rod; 206. Circular block; 207. Round rod; 208. Perforated block; 209. Spring; 210. Perforated sealing block; 211. Tubular sponge block; 212. Sealing gasket; 213. Rectangular hole; 214. Anti-slip pad; 215. First groove; 216. Second groove; 3. Insulation block. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1: Please refer to Figures 1-10. The present invention provides a technical solution: a low-smoke halogen-free flame-retardant and fire-resistant branch cable, including two cable bodies 1 and a single insulating block 3. The insulating block 3 is injection molded and fixed on the outside of the two cable bodies 1. A protective mechanism 2 is provided between the two cable bodies 1. The protective mechanism 2 is used for protection at the connection of the two cable bodies 1.

[0036] The protective mechanism 2 includes a double-hole frame 201, a main protective shell 202, and a secondary protective shell 203. Two shells 204 are fixed between adjacent main protective shells 202 and secondary protective shells 203. A plug rod 205 is connected to the inner side of the double-hole frame 201. A ring block 206 is rotatably disposed inside the shell 204. A round rod 207 is sleeved on the axis of each ring block 206. A perforated block 208 is fixed to one end of each round rod 207 away from the ring block 206. A spring 209 is sleeved on the outer periphery of the round rod 207. The secondary protective shell 203 has multiple rectangular holes 213 for fitting with the shell 204. The main protective shell 202 has two... The first groove 215 and the secondary protective shell 203 have two second grooves 216. Anti-slip pads 214 are provided in both the first groove 215 and the second groove 216. Each perforated block 208 is bonded to one side of the perforated sealing block 210, and a tubular sponge block 211 is bonded to the other side of each perforated sealing block 210. A sealing gasket 212 is bonded to the bottom of each annular block 206. The main protective shell 202 is connected to the secondary protective shell 203. The sides of the main protective shell 202 and the secondary protective shell 203 near the double-hole frame 201 abut against the far end of the double-hole frame 201. The insertion rod 205 passes through each shell 204 and connects with the double-hole frame. The distal end of 201 is connected, and the insertion rod 205 passes through one side of the secondary protective shell 203. The insertion rod 205 passes through each rectangular hole 213 in sequence and extends out from the other side of the secondary protective shell 203. Each shell 204 mates with the rectangular hole 213. One end of the spring 209 abuts against the inside of each perforated block 208, and the other end of the spring 209 abuts against each ring block 206. The other end of each round rod 207 away from the ring block 206 passes through the insertion rod 205. The tubular sponge block 211 is disposed inside the shell 204. The end of the tubular sponge block 211 near the perforated block 208 extends into the perforated sealing block 2. 10. The inner wall of each tubular sponge block 211 contacts the outer side of each spring 209. The other end of each round rod 207 passes through the sealing gasket 212. The outer surface of the sealing gasket 212 contacts the inner wall of each housing 204. The side of the perforated sealing block 210 away from the perforated block 208 abuts against the housing 204. One side of the insulating block 3 is fixed to the other side of the double-hole frame 201. Two sheath layers 101 are respectively set inside the two round holes of the double-hole frame 201. The four anti-slip pads 214 are divided into two groups. The part of each sheath layer 101 that extends into the double-hole frame 201 contacts the anti-slip pad 214.

[0037] In this embodiment, when it is necessary to separate the main protective shell 202 and the secondary protective shell 203 from the double-hole frame 201, the main protective shell 202 is first pressed down, and then a force is applied to each of the two perforated blocks 208, so that the two perforated blocks 208 move away from the main protective shell 202. At this time, the two moving perforated blocks 208 will drive the corresponding round rod 207, the corresponding perforated sealing block 210 and the corresponding tubular sponge block 211 to move together. At the same time, each moving perforated block 208 will drive the corresponding ring block 206 to move axially. During the movement, the ring block 206 applies pressure to the spring 209, so that the spring 209 is subjected to force and undergoes elastic deformation. Since the annular block 206 is connected to the circular rod 207, the circular rod 207 gradually separates from the insertion rod 205. When the circular rod 207 is completely separated from the insertion rod 205, the insertion rod 205 is operated to move it closer to the double-hole bracket 201 until it reaches its limit position. At this point, the stopped insertion rod 205 will separate from both housings 204 and the secondary protective housing 203. Then, the force applied to the two perforated blocks 208 is released. Both perforated blocks 208 will then reset under the return force of their corresponding springs 209. After that, the secondary protective housing 203 is pressed down, and the main protective housing 202 is moved away from the secondary protective housing 203. At this time, the moving main protective shell 202, in cooperation with the corresponding first groove 215, will drive the corresponding anti-slip pad 214 and the two shells 204 to move. The two moving shells 204 will cause the corresponding perforated blocks 208 to move. When the two perforated blocks 208 have moved out of the corresponding rectangular holes 213, the main protective shell 202 can be taken out directly, and then the secondary protective shell 203 can be taken out. At this time, the main protective shell 202 and the secondary protective shell 203 are separated from the double hole frame 201. When it is necessary to reset the main protective shell 202 and the secondary protective shell 203 to their original positions, the operation process described above can be reversed to connect the main protective shell 202 and the secondary protective shell 203. When all the above components are returned to their original positions (as shown in Figures 1 and 2), the "Y-shaped fork" at the branch joint of the low-smoke halogen-free flame-retardant fire-resistant branch cable can be protected through the cooperation of the main protective shell 202, the secondary protective shell 203, the double-hole frame 201, the insertion rod 205, the two shells 204, the two sets of anti-slip pads 214, the two first grooves 215, the two second grooves 216, and the two rectangular holes 213. Simultaneously, the tubular sponge block 211 lubricates the spring 209 and bearing inside the corresponding shell 204, preventing rust and extending their service life. Furthermore, the cooperation of the corresponding perforated sealing block 210 and the corresponding sealing gasket 212 prevents leakage of the lubricating oil (pre-injected) inside the corresponding tubular sponge block 211, thus preventing environmental pollution and reducing contact between the lubricating oil and air, thereby reducing the oxidation rate of the lubricating oil.

[0038] Example 2: As shown in Figures 1-3 and 5, each cable body 1 includes a sheath layer 101 and two shielding layers 105. Each sheath layer 101 has a flame-retardant layer 102 on its inner wall, each flame-retardant layer 102 has a fire-resistant layer 103 on its inner wall, each fire-resistant layer 103 has a wrapping layer 104 on its inner wall, each shielding layer 105 has an insulation layer 107 on its inner wall, and each insulation layer 107 has a conductor core 106 inside. The four shielding layers 105 are divided into two groups, and a filler layer 108 is provided between each wrapping layer 104 and each group of shielding layers 105.

[0039] In this embodiment, when the cable body 1 is subjected to a certain degree of external force during laying and use, the sheath layer 101 can protect the conductor core 106 and insulation layer 107 inside the cable body 1 from damage, thereby improving the service life and reliability of the cable body 1. When the cable body 1 encounters a fire, the flame-retardant layer 102 effectively prevents the spread of flames, thus slowing the development of the fire and buying more time for personnel evacuation and fire rescue. When the cable body 1 is in a fire, the fire-resistant layer 103 improves its heat insulation performance and mechanical strength, effectively blocking heat conduction and preventing damage to the internal structure of the cable body 1 due to high temperatures. When the cable body 1 is used in a humid environment, the wrapping layer 104 enhances its stability, ensuring long-term stable operation under various harsh environments and extending its service life. When high-frequency or low-frequency electromagnetic interference sources exist around the cable body 1, the shielding layer 105 effectively reflects and absorbs electromagnetic signals, ensuring signal transmission within the cable body 1. When the cable body 1 is in use, the conductor core 106 effectively reduces energy loss during transmission, thereby improving the power transmission capacity of the cable body 1. Efficiency: When the cable body 1 is used again, the insulation layer 107 can effectively prevent current leakage, thereby ensuring the safe operation of the cable body 1 and reducing the risk of accidents such as short circuits and leakage due to poor insulation performance. When the cable body 1 is in use, the filling layer 108 can enhance the overall mechanical strength of the cable body 1, thereby improving the compressive and tensile strength of the cable body 1, making it less susceptible to damage during laying and use, and extending its service life. When low-smoke halogen-free flame-retardant fire-resistant branch cables are required, the two conductor cores 106 at the branch joint of one cable body 1 (main branch cable) are first exposed. Then, the two conductor cores 106 at the joint of the other cable body 1 (branch cable) are welded to the two conductor cores 106 at the branch joint of one cable body 1. Then, the four conductor cores 106 at the branch joints of the two cable body 1s that have completed the welding operation are injection molded, so that the two adjacent conductor cores 106 in each cable body 1 do not contact each other. When the injection molding operation is completed, an insulating block 3 will be formed at the branch joint of the two adjacent cable bodies 1. With the cooperation of the two cable bodies 1 and the insulating block 3, a low-smoke halogen-free flame-retardant fire-resistant branch cable can be formed.

[0040] The overall effect and working principle of the mechanism are as follows: When it is necessary to separate the main protective shell 202 and the secondary protective shell 203 from the double-hole frame 201, the main protective shell 202 is pressed down first, and then a force is applied to each of the two perforated blocks 208, so that the two perforated blocks 208 move away from the main protective shell 202. At this time, the two moving perforated blocks 208 will drive the corresponding round rod 207, the corresponding perforated sealing block 210 and the corresponding tubular sponge block 211 to move together. At the same time, each moving perforated block 208 will drive the corresponding ring block 206 to move axially. During the movement, the ring block 206 applies pressure to the spring 209, so that the spring 209 is subjected to force and produces elastic deformation. Since the annular block 206 is connected to the circular rod 207, the circular rod 207 gradually separates from the insert rod 205. When the circular rod 207 is completely separated from the insert rod 205, the insert rod 205 is operated to move towards the double-hole frame 201 until it reaches its limit position. As shown in Figure 10, the insert rod 205 is completely inside the double-hole frame 201. The stopped insert rod 205 will separate from both housings 204 and the secondary protective housing 203. Then, the force applied to the two perforated blocks 208 is released. At this time, both perforated blocks 208 will reset under the cooperation of the corresponding spring 209's rebound force. Then, the secondary protective housing 203 is pressed down, and the main protective housing 202 is moved away from the secondary protective housing. The protective shell 203 moves in the direction of movement. At this time, the moving main protective shell 202, in cooperation with the corresponding first groove 215, drives the corresponding anti-slip pad 214 and the two shells 204 to move. The two moving shells 204 will cause the corresponding perforated blocks 208 to move. When the two perforated blocks 208 move out of the corresponding rectangular holes 213, the main protective shell 202 can be taken out directly, and then the secondary protective shell 203 can be taken out. At this time, the main protective shell 202 and the secondary protective shell 203 are separated from the double hole frame 201. When it is necessary to reset the main protective shell 202 and the secondary protective shell 203 to their original positions, the operation can be reversed according to the above operation process to connect the main protective shell 202 and the secondary protective shell 203. When all the above components are reset to their original positions (as shown in Figures 1 and 2), the "Y-shaped fork" at the branch joint of the low-smoke halogen-free flame-retardant fire-resistant branch cable can be protected by the cooperation of the main protective shell 202, the secondary protective shell 203, the double-hole frame 201, the plug rod 205, the two shells 204, the two sets of anti-slip pads 214, the two first grooves 215, the two second grooves 216 and the two rectangular holes 213. At the same time, under the action of the tubular sponge block 211, the spring 209 and bearing inside the corresponding shell 204 can be lubricated, thereby preventing them from rusting and extending their service life.Furthermore, with the cooperation of the corresponding perforated sealing block 210 and the corresponding sealing gasket 212, the lubricating oil (pre-injected) inside the corresponding tubular sponge block 211 can be prevented from leaking and polluting the surrounding environment, and the contact between the lubricating oil and air can be reduced, thereby reducing the oxidation rate of the lubricating oil. When the cable body 1 is subjected to a certain degree of external force during laying and use, the sheath layer 101 can protect the conductor core 106 and insulation layer 107 inside the cable body 1 from damage, thereby improving the service life and reliability of the cable body 1. When the cable body 1 encounters a fire, the flame-retardant layer 102 effectively prevents the spread of flames, thus slowing the development of the fire and buying more time for personnel evacuation and fire rescue. When the cable body 1 is in a fire, the fire-resistant layer 103 improves its heat insulation performance and mechanical strength, effectively blocking heat conduction and preventing damage to the internal structure of the cable body 1 due to high temperatures. When the cable body 1 is used in a humid environment, the wrapping layer 104 enhances its stability, ensuring long-term stable operation under various harsh environments and extending its service life. When high-frequency or low-frequency electromagnetic interference sources exist around the cable body 1, the shielding layer 105 effectively reflects and absorbs electromagnetic signals, ensuring signal transmission within the cable body 1. When the cable body 1 is in use, the conductor core 106 effectively reduces energy loss during transmission, thereby improving the power transmission capacity of the cable body 1. Efficiency: When the cable body 1 is used again, the insulation layer 107 can effectively prevent current leakage, thereby ensuring the safe operation of the cable body 1 and reducing the risk of accidents such as short circuits and leakage due to poor insulation performance. When the cable body 1 is in use, the filling layer 108 can enhance the overall mechanical strength of the cable body 1, thereby improving the compressive and tensile strength of the cable body 1, making it less susceptible to damage during laying and use, and extending its service life. When low-smoke halogen-free flame-retardant fire-resistant branch cables are required, the two conductor cores 106 at the branch joint of one cable body 1 (main branch cable) are first exposed. Then, the two conductor cores 106 at the joint of the other cable body 1 (branch cable) are welded to the two conductor cores 106 at the branch joint of one cable body 1. Then, the four conductor cores 106 at the branch joints of the two cable body 1s that have completed the welding operation are injection molded, so that the two adjacent conductor cores 106 in each cable body 1 do not contact each other. When the injection molding operation is completed, an insulating block 3 will be formed at the branch joint of the two adjacent cable bodies 1. With the cooperation of the two cable bodies 1 and the insulating block 3, a low-smoke halogen-free flame-retardant fire-resistant branch cable can be formed.

[0041] Among them, the sheath layer 101 is made of polyolefin material, the flame retardant layer 102 is made of aluminum hydroxide material, the fire resistant layer 103 is made of ceramicized silicone rubber material, the wrapping layer 104 is made of mica tape material, the shielding layer 105 is made of aluminum foil, the conductor core 106 is made of copper material, the insulation layer 107 is made of polyethylene material, the filler layer 108 is made of glass fiber material, and the insulating block 3 is made of polyolefin material.

[0042] As shown in Figure 1, the two cable bodies 1 inside the double-hole frame 201 are the "Y-shaped junctions" at the branch joints of the low-smoke halogen-free flame-retardant and fire-resistant branch cables.

[0043] Among them, the end of the double-hole frame 201 closest to the main protective shell 202 and the secondary protective shell 203 is the far end, and the end of the double-hole frame 201 furthest from the main protective shell 202 and the secondary protective shell 203 is the near end.

[0044] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-smoke, halogen-free, flame-retardant, fire-resistant branch cable, comprising two cable bodies and a single insulating block, wherein the insulating block is injection molded and fixed to the outside of the two cable bodies, characterized in that: A protective mechanism is provided between the two cable bodies for protection at the connection point. The protective mechanism includes a double-hole frame, a main protective shell, and a secondary protective shell. Two shells are fixed between adjacent main and secondary protective shells. A rod is connected to the inner side of the double-hole frame. A circular block is rotatably disposed inside the shell. A circular rod is sleeved around the axis of each circular block. A perforated block is fixed to one end of each circular rod away from the circular block. A spring is sleeved around the outer circumference of each circular rod. The secondary protective shell has multiple rectangular holes for fitting into the shell. The main protective shell is connected to the secondary protective shell. The sides of both the main and secondary protective shells near the double-hole frame abut against the far end of the double-hole frame. The insertion rod passes through each shell and is connected to the far end of the double-hole frame. One end of the spring abuts against the inner side of each perforated block, and the other end of the spring abuts against each ring block. The other end of each round rod away from the ring block passes through the insertion rod. The outer surface of the sealing gasket contacts the inner wall of each shell. The side of the perforated sealing block away from the perforated block abuts against the shell. One side of the insulating block is fixed to the other side of the double-hole frame.

2. The low-smoke halogen-free flame-retardant fire-resistant branch cable according to claim 1, characterized in that: The main protective shell has two first grooves, and the secondary protective shell has two second grooves. Anti-slip pads are provided in both the first and second grooves. Each perforated block is bonded to one side of a perforated sealing block, and a tubular sponge block is bonded to the other side of each perforated sealing block. A sealing pad is bonded to the bottom of each annular block.

3. The low-smoke halogen-free flame-retardant and fire-resistant branch cable according to claim 1, characterized in that: The insertion rod passes through one side of the sub-protective shell, and the insertion rod sequentially passes through each rectangular hole and extends out from the other side of the sub-protective shell; each shell mates with the rectangular hole respectively.

4. The low-smoke halogen-free flame-retardant and fire-resistant branch cable according to claim 2, characterized in that: The tubular sponge block is disposed inside the housing, with one end of the tubular sponge block near the perforated block extending into the perforated sealing block. The inner wall of each tubular sponge block contacts the outer side of each spring, and the other end of each round rod passes through the sealing gasket.

5. The low-smoke halogen-free flame-retardant and fire-resistant branch cable according to claim 2, characterized in that: Each of the cable bodies includes a sheath layer and two shielding layers. The inner wall of each sheath layer is provided with a flame-retardant layer, the inner wall of each flame-retardant layer is provided with a fire-resistant layer, and the inner wall of each fire-resistant layer is provided with a wrapping layer.

6. The low-smoke halogen-free flame-retardant fire-resistant branch cable according to claim 5, characterized in that: Each of the shielding layers has an insulating layer on its inner wall, and each insulating layer has a conductive core inside it. The four shielding layers are divided into two groups, and a filling layer is provided between each wrapping layer and each group of shielding layers.

7. The low-smoke halogen-free flame-retardant fire-resistant branch cable according to claim 5, characterized in that: The two sheath layers are respectively set inside the two round holes of the double-hole frame, and the four anti-slip pads are divided into two groups. The part of each sheath layer that extends into the double-hole frame is in contact with the anti-slip pad.

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