Halogen-free flame-retardant cable

Abstract

The utility model discloses a halogen-free flame-retardant cable, which comprises four groups of copper conductors, and each group comprises seven copper conductors. Four insulating layers are arranged on the periphery of the outer side of the main tensile stay wire at equal angles, and the tensile property of the halogen-free flame-retardant cable can be improved through the arrangement of the main tensile stay wire; the outer side of the insulating layer is sleeved with a row of fixing sleeves, and every two adjacent fixing sleeves are connected through a circle of auxiliary tensile wires. According to the halogen-free flame-retardant cable, the main tensile stay wire made of the polyamide fiber is arranged in the center of the halogen-free flame-retardant cable, so that when the halogen-free flame-retardant cable is pulled, the tensile property of the whole halogen-free flame-retardant cable can be improved by the main tensile stay wire; furthermore, through the cooperative use of the auxiliary tensile wire made of polyamide fiber and the fixing sleeve, when the main tensile wire is damaged by tensile force, the tensile performance of the halogen-free flame-retardant cable can be improved through the cooperation of the auxiliary tensile wire and the fixing sleeve, so that the damage of the halogen-free flame-retardant cable is avoided.

Description

Technical Field

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

[0002] Halogen-free flame-retardant cables are widely used in the construction and subway fields due to their low combustion, low smoke and non-toxicity. However, there are still some problems with the halogen-free flame-retardant cables on the market, such as:

[0003] The patent name disclosed in the prior art with the announcement number "CN216353541U" is "A load-bearing halogen-free flame-retardant cable", which discloses that the supporting core is formed by twisting steel wire or aluminum alloy wire, has strong tensile resistance, and the length of the flame-retardant core is longer than that of the supporting core. When laid vertically, the tension is mainly supported by the middle supporting core, and the surrounding flame-retardant core will not be subjected to excessive tension, so as to maintain the stability and service life of the original structure; and the flame-retardant core adopts 8000 series aluminum alloy core conductor, which is about 1 / 3 lighter than the copper core cable, further reducing the weight of the cable;

[0004] Although the halogen-free flame retardant cable in the above-mentioned prior art mainly supports the tension by the middle supporting wire core when it is laid vertically, when the halogen-free flame retardant cable is subjected to a large tension and the middle supporting wire core is damaged, the tensile performance of the halogen-free flame retardant cable will be reduced, thereby affecting the service life of the halogen-free flame retardant cable. Utility Model Content

[0005] The utility model aims to provide a halogen-free flame-retardant cable to solve the problem raised in the above-mentioned background technology that although the halogen-free flame-retardant cables on the market at present mainly support the tension by the middle supporting wire core when they are laid vertically, when the halogen-free flame-retardant cables are subjected to a large tension and the middle supporting wire core is damaged, the tensile performance of the halogen-free flame-retardant cables will be reduced, thereby affecting the service life of the halogen-free flame-retardant cables.

[0006] To achieve the above object, the utility model provides the following technical solution: a halogen-free flame-retardant cable, comprising a copper conductor, wherein the copper conductor is arranged in four groups, each group having seven conductors;

[0007] The outer side of each group of copper conductors is covered with an insulating layer;

[0008] The main tensile wire has four insulating layers arranged at equal angles around its outer side. The setting of the main tensile wire can improve the tensile performance of the halogen-free flame-retardant cable;

[0009] The outer sleeve of the insulating layer is provided with a row of fixing sleeves, and two adjacent fixing sleeves are connected by a circle of auxiliary tensile wire;

[0010] An inner sheath is arranged on the outer side of the fixing sheath, and an outer sheath is arranged on the outer side of the inner sheath.

[0011] Preferably, the outer side of the fixing sleeve is connected to the outer side surface of the main tensile wire, and the main tensile wire and the auxiliary tensile wire are both made of polyamide fiber.

[0012] Through the arrangement of the above structure, the main tensile wire and the auxiliary tensile wire, both made of polyamide fiber, can greatly improve the tensile performance of the halogen-free flame-retardant cable.

[0013] Preferably, connecting columns are installed at equal angles on the outside of the main tensile wire, and the outer ends of the connecting columns are connected to the inner side walls of the inner sheath, and the outer sides of the connecting columns are sleeved with connecting springs.

[0014] Through the arrangement of the above structure, the connecting column can improve the stability of the main tensile line.

[0015] Preferably, one end of the connecting spring is connected to the inner wall of the inner sheath, and the other end of the connecting spring is connected to the outer side of the connecting column.

[0016] Through the arrangement of the above structure, the force accumulated by the connecting spring can drive the squeezed inner sheath to reset in the later stage.

[0017] Preferably, both left and right sides of the connecting column are connected to the corresponding fixing sleeves, and the length of the connecting column is greater than the diameter of the fixing sleeve, and the connecting column is made of rubber.

[0018] Through the arrangement of the above structure, the connecting column made of rubber material can be well reset.

[0019] Preferably, the connecting column and the connecting spring are arranged in a one-to-one correspondence, and the connecting column is reset by the connecting spring.

[0020] Through the arrangement of the above structure, the stored force of the connecting spring can drive the squeezed connecting column to reset.

[0021] Preferably, the fixing sleeve is arranged in a circular ring-shaped structure, and the material of the fixing sleeve is galvanized steel strip.

[0022] Through the arrangement of the above structure, the cooperation between the fixing sleeve made of galvanized steel strip and the auxiliary tensile wire can resist a certain tensile force, thereby improving the tensile performance of the halogen-free flame-retardant cable.

[0023] Compared with the prior art, the beneficial effect of the utility model is that the halogen-free flame-retardant cable, through the use of the auxiliary tensile wire made of polyamide fiber and the fixed sleeve, when the main tensile wire is damaged by tension, the auxiliary tensile wire and the fixed sleeve can cooperate to improve the tensile performance of the halogen-free flame-retardant cable, thereby avoiding damage to the halogen-free flame-retardant cable. The specific contents are as follows:

[0024] (1) The main tensile wire made of polyamide fiber is arranged at the center of the halogen-free flame-retardant cable, and then when the halogen-free flame-retardant cable is pulled, the main tensile wire can improve the tensile performance of the entire halogen-free flame-retardant cable;

[0025] Furthermore, by using the auxiliary tensile wire made of polyamide fiber in combination with the fixed sleeve, when the main tensile wire is damaged by tension, the auxiliary tensile wire and the fixed sleeve can cooperate to improve the tensile performance of the halogen-free flame-retardant cable, thereby avoiding damage to the halogen-free flame-retardant cable.

[0026] (2) When the halogen-free flame-retardant cable is squeezed and flattened, the rubber connecting post can be reset through the stored force of the connecting spring, and then the connecting post drives the inner sheath and the outer sheath at the squeezed position to reset, so that the halogen-free flame-retardant cable can be quickly deformed and reset after being squeezed and flattened;

[0027] (3) At the same time, the fixing sleeves are connected to the fixing sleeves on both sides through the connecting column, so that the stability of the fixing sleeve installation can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0029] Figure 2 This is a schematic diagram of the three-dimensional structure of the auxiliary tensile wire of the utility model;

[0030] Figure 3 This is a schematic diagram of the three-dimensional structure of the main tensile wire of the utility model;

[0031] Figure 4 This is a schematic diagram of the connection structure between the main tensile wire and the fixed sleeve of the utility model;

[0032] Figure 5 This is a schematic diagram of the three-dimensional structure of the fixing sleeve of the utility model;

[0033] Figure 6 This is a schematic diagram of the connection structure between the main tensile wire and the connecting column of the utility model;

[0034] Figure 7 It is a schematic diagram of the connection structure between the connection spring and the connection column of the utility model.

[0035] In the figure: 1. main tensile wire; 2. insulation layer; 3. inner sheath; 4. outer sheath; 5. fixing sleeve; 6. secondary tensile wire; 7. connecting column; 8. connecting spring; 9. copper conductor. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] See also Figure 1-Figure 7 , the utility model provides the following technical solutions:

[0038] Embodiment 1: In this embodiment, the tensile strength of the halogen-free flame-retardant cable can be further improved, thereby increasing the service life of the halogen-free flame-retardant cable. Figure 1-Figure 5 As shown, it includes copper conductors 9, and the copper conductors 9 are arranged in four groups, each group having seven; the outer side of each group of copper conductors 9 is provided with an insulating layer 2; the main tensile wire 1, the outer side of which is provided with four insulating layers 2 at equal angles, and the arrangement of the main tensile wire 1 can improve the tensile performance of the halogen-free flame-retardant cable;

[0039] A row of fixed sleeves 5 are sleeved on the outer side of the insulating layer 2, and two adjacent fixed sleeves 5 are connected by a circle of secondary tensile wire 6; an inner sheath 3 is arranged on the outer side of the fixed sleeve 5, and an outer sheath 4 is sleeved on the outer side of the inner sheath 3. The outer side of the fixed sleeve 5 is connected to the outer side of the main tensile wire 1, and the main tensile wire 1 and the secondary tensile wire 6 are both made of polyamide fiber. The entire halogen-free flame retardant cable is moved to the use area. When the halogen-free flame retardant cable is laid vertically, the main tensile wire 1 is set at the center of the halogen-free flame retardant cable. At this time, the main tensile wire 1 is subjected to a certain tensile force, so the tensile force on the copper conductor 9 can be reduced, and then the tensile performance of the entire halogen-free flame retardant cable can be improved, so that the service life of the halogen-free flame retardant cable is greatly improved;

[0040] When the main tensile wire 1 is damaged due to a large tensile force, the fixed sleeve 5 and the auxiliary tensile wire 6 sleeved on the outside of the insulating layer 2 will be subjected to a certain tensile force, thereby reducing the tensile force on the insulating layer 2 and protecting the copper conductor 9 in the insulating layer 2. Therefore, the cooperation between the auxiliary tensile wire 6 and the fixed sleeve 5 can further improve the tensile performance of the halogen-free flame-retardant cable, thereby avoiding damage to the halogen-free flame-retardant cable.

[0041] Embodiment 2: In this embodiment, the halogen-free flame-retardant cable that has been deformed due to extrusion can be quickly reset. Figure 6-Figure 7As shown, connecting columns 7 are installed at equal angles on the outside of the main tensile wire 1, and the outer ends of the connecting columns 7 are connected to the inner wall of the inner sheath 3, and the outer side of the connecting columns 7 is sleeved with connecting springs 8, one end of the connecting springs 8 is connected to the inner wall of the inner sheath 3, and the other end of the connecting springs 8 is connected to the outer side of the connecting columns 7. The left and right sides of the connecting column 7 are connected to the corresponding fixing sleeve 5, and the length of the connecting column 7 is greater than the diameter of the fixing sleeve 5, and the material of the connecting column 7 is rubber material. The connecting column 7 and the connecting spring 8 are arranged in a one-to-one correspondence, and the connecting column 7 is reset by the connecting spring 8. The fixing sleeve 5 is arranged in a circular ring shape, and the material of the fixing sleeve 5 is galvanized steel strip. When the halogen-free flame-retardant cable is squeezed and flattened, the connecting column 7 and the connecting spring 8 corresponding to the squeezed position are also squeezed to a certain extent. At this time, the connecting spring 8 is squeezed and accumulates force, and the rubber connecting column 7 is squeezed. When the halogen-free flame-retardant cable is not squeezed by the outside world, the rubber connecting column 7 can be reset by the accumulated force of the connecting spring 8, and then the inner sheath 3 and the outer sheath 4 at the squeezed position of the connecting column 7 are stretched outward, so that the halogen-free flame-retardant cable can be quickly deformed and reset after being squeezed and flattened. The contents not described in detail in this specification belong to the existing technology known to professional and technical personnel in this field.

[0042] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A halogen-free flame-retardant cable, comprising a copper conductor (9), wherein the copper conductor (9) is arranged in four groups, each group having seven conductors; It is characterized in that Also includes: The outer side of each group of copper conductors (9) is covered with an insulating layer (2); A main tensile wire (1) has four insulating layers (2) arranged at equal angles on its outer sides. The arrangement of the main tensile wire (1) can improve the tensile performance of the halogen-free flame-retardant cable. A row of fixing sleeves (5) is sleeved on the outer side of the insulating layer (2), and two adjacent fixing sleeves (5) are connected via a loop of auxiliary tensile wire (6); An inner protective sleeve (3) is arranged on the outer side of the fixing sleeve (5), and an outer protective sleeve (4) is arranged on the outer side of the inner protective sleeve (3).

2. The halogen-free flame-retardant cable according to claim 1, characterized in that: The outer side of the fixing sleeve (5) is connected to the outer side surface of the main tensile wire (1), and the main tensile wire (1) and the auxiliary tensile wire (6) are both made of polyamide fiber.

3. The halogen-free flame-retardant cable according to claim 1, characterized in that: A connecting column (7) is installed at an equal angle on the outside of the main tensile wire (1), and the outer end of the connecting column (7) is connected to the inner wall of the inner sheath (3), and a connecting spring (8) is sleeved on the outside of the connecting column (7).

4. The halogen-free flame-retardant cable according to claim 3, characterized in that: One end of the connecting spring (8) is connected to the inner wall of the inner sleeve (3), and the other end of the connecting spring (8) is connected to the outer side of the connecting column (7).

5. The halogen-free flame-retardant cable according to claim 3, characterized in that: The left and right sides of the connecting column (7) are connected to the corresponding fixing sleeve (5), the length of the connecting column (7) is greater than the diameter of the fixing sleeve (5), and the material of the connecting column (7) is rubber.

6. The halogen-free flame-retardant cable according to claim 3, characterized in that: The connecting column (7) and the connecting spring (8) are arranged in a one-to-one correspondence, and the connecting column (7) is reset by the connecting spring (8).

7. The halogen-free flame-retardant cable according to claim 1, characterized in that: The fixing sleeve (5) is arranged in a circular ring-shaped structure, and the material of the fixing sleeve (5) is a galvanized steel strip.

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