Nonmetal coated cable

Abstract

The utility model discloses a nonmetal coated cable, which comprises a sheath layer and at least two wire parts arranged in the sheath layer at intervals, each wire part comprises a conductor and an insulating layer tightly coated on the outer side of the conductor, and a filling part is arranged between the two wire parts. The filling part comprises a filling strip and a pull wire used for increasing the tensile strength of the filling strip, the pull wire is located in the center of the filling strip, and the two sides of the filling strip are connected with the insulating layer, so that the situation that the middle of the insulating wire core is sunken, and the subsequent machining procedure is affected is prevented; therefore, the tensile strength of the filling strip can be further improved, and the final production precision of the cable is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cable production, and more specifically, relates to a non-metallic coated cable. Background Art

[0002] The cable has the characteristics of being electrified inside and insulated outside. It is a device for transmitting electric energy or signals. It is usually a rope-like cable made of several or several groups of wires (at least two in each group). Each group of wires is insulated from each other and are often twisted around a center. The entire outside is covered with a highly insulating covering.

[0003] During cable production, the spacing between adjacent conductor surfaces should be ensured to be within a certain range. Currently, most workshops use filling strips and extruded tubes for production, but the production accuracy of the extrusion die does not meet the requirements, which will cause the middle of the insulated core to be concave and the finished product to be flanging. Summary of the invention

[0004] The main purpose of the utility model is to provide a non-metallic coated cable which can improve the cable production accuracy and the core depression.

[0005] In order to achieve the above object, the technical solution of the utility model is:

[0006] A non-metallic sheathed cable comprises a sheath layer and at least two conductor portions spaced apart in the sheath layer, the conductor portions comprising a conductor and an insulating layer tightly sheathed on the outside of the conductor, a filling portion is provided between the two conductor portions, the filling portion comprises a filling bar and a traction line for increasing the tensile strength of the filling bar, the traction line is located at the center of the filling bar, and the two sides of the filling bar are respectively connected to the insulating layer.

[0007] In a specific embodiment of the present invention, the pulling line is arranged at an equal distance from the wire portions on both sides.

[0008] In a specific embodiment of the present invention, the pulling line is arranged in parallel with the conductors on both sides.

[0009] In a specific embodiment of the present invention, the filling strip is a square structure, and the pulling line is arranged along the length direction of the filling strip.

[0010] In a specific embodiment of the present invention, the traction line is a member made of aramid yarn material.

[0011] In a specific embodiment of the present invention, the filling strip is a flame-retardant PVC insulating material component.

[0012] In a specific embodiment of the present invention, the interval between adjacent insulating layers is greater than 3.18 mm.

[0013] In a specific embodiment of the present invention, the conductor is a copper material component.

[0014] In a specific embodiment of the present invention, the insulating layer and the sheath layer are both made of polyvinyl chloride material.

[0015] One of the above technical solutions of the utility model has at least one of the following advantages or beneficial effects:

[0016] The utility model provides a filling portion between the conductor portions, and connects the two sides of the filling strip to the insulating layer respectively, thereby preventing a depression from occurring in the middle of the insulating core to affect subsequent processing procedures, and by arranging a pulling wire at the center position of the filling strip, the tensile strength of the filling strip can be further increased, thereby improving the final production accuracy of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0018] Figure 1 It is an overall cross-sectional view of an embodiment of the utility model. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0020] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0021] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0023] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal connection between two elements, indirect connection, or an interactive relationship between two elements.

[0024] The following disclosure provides many different embodiments or examples for implementing different solutions of the present invention.

[0025] Reference Figure 1 As shown, a non-metallic sheathed cable includes a sheath layer 1, two conductor parts 2 spaced apart in the sheath layer 1, and a filling part 3 arranged between the two conductor parts 2, wherein the conductor part 2 includes a conductor 21 and an insulating layer 22 tightly wrapped around the outside of the conductor 21, the conductor 21 is a copper material component, and the interval between adjacent insulating layers 22 is maintained greater than 3.18 mm.

[0026] In one embodiment of the utility model, the insulating layer 22 and the sheath layer 1 are both made of polyvinyl chloride material, wherein the insulating layer 22 is made of 60°C polyvinyl chloride insulation material of UL standard, the average value of the insulation thickness is not less than the specified nominal value, and the thinnest point of the insulating layer 22 is not less than 85% of the nominal thickness, and the outer sheath 1 is made of 60°C polyvinyl chloride sheath material of UL standard, and the thickness of the thinnest point of the outer sheath 1 is not less than 80% of the nominal thickness.

[0027] In one embodiment of the utility model, the filling portion 3 includes a filling strip 31 and a traction line 32 arranged at the center position of the filling strip 31. The traction line 32 is arranged along the length direction of the filling strip 31, and the traction line 32 is respectively arranged in parallel with the conductors 21 on both sides. The traction line 32 is a 1000D aramid yarn material component. The traction line 32 is used to increase the tensile strength of the filling strip 31, thereby ensuring that the filling strip 31 has a certain tensile resistance, and while strengthening the strength of the filling strip 31, it also has excellent bending characteristics, which can ensure the bending of right angles and corners during the laying process.

[0028] In one embodiment of the utility model, the filling strip 31 is a flame-retardant PVC insulating material component. The flame-retardant PVC insulating material uses a flame-retardant plasticizer instead of a conventional plasticizer, so that when burned, it thermally decomposes to generate non-volatile polyphosphoric acid, which can form a protective film on the solid surface to isolate it from contact with oxygen, and by adding a small amount of aluminum hydroxide into the filling strip 31, a significant smoke suppression effect can be achieved.

[0029] In one embodiment of the utility model, the pulling wire 32 is set at an equal distance from the conductor parts 2 on both sides, so that when extruding the filling strip 31, the eccentricity can be adjusted with the pulling wire 32 as the center to reduce the flanging, and then in the subsequent wire winding and arranging, the flanging can be manually arranged. When extruding the sheath layer 1, a suitable wire joining die can be designed, and a section of the wire joining die can be processed and glued with tape, so that the flanging can be further reduced.

[0030] In one embodiment of the utility model, both sides of the filling strip 31 are respectively connected to the insulating layer 22, and the filling strip 31 is a square structure. The upper and lower ends of the filling strip 31 are respectively connected to the inner wall of the sheath layer 1, thereby preventing a depression from occurring in the middle of the insulating core and affecting subsequent processing procedures.

[0031] In one embodiment of the utility model, an intermediate layer is provided between the insulating layer 22 and the sheath layer 1, and the intermediate layer is evenly coated.

[0032] The production process of the non-metallic coated cable is as follows: firstly, a copper rod with a diameter of 8 mm is subjected to a conductor drawing and annealing process, and the elongation at break of the single wire after annealing is ensured to be not less than 30%;

[0033] Then, the insulation layer 22 is extruded and flame-tested using 60°C polyvinyl chloride insulation material of UL standard;

[0034] Further, the filling strip 31 and the traction line 32 made of 1000D aramid yarn are extruded to ensure that the extruded surface of the filling strip 1 is smooth and the cross section has no defects such as pores and sand holes visible to the naked eye;

[0035] Further, the 60°C polyvinyl chloride sheath material of the UL standard is subjected to the extrusion process of the sheath layer 1, and a layer of cable talcum powder is required to be provided between the insulating layer 22 and the outer sheath 1 to prevent the insulating layer 22 and the outer sheath 1 from adhering to each other, and the outer sheath 1 needs to be vacuumed during extrusion to ensure close contact between the insulating layer 22 and the inner wall of the outer sheath 1;

[0036] The last step is to carry out finished product inspection and packaging procedures, that is, to measure the outer diameter and resistance of the conductor. The insulation resistance of the finished cable should be no less than 50MΩ·km at 20℃.

[0037] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A non-metallic sheathed cable, comprising a sheath layer (1) and at least two conductor parts (2) spaced apart in the sheath layer (1), characterized in that: The wire portion (2) comprises a conductor (21) and an insulating layer (22) tightly wrapped around the outside of the conductor (21); a filling portion (3) is provided between the two wire portions (2); the filling portion (3) comprises a filling bar (31) and a traction line (32) for increasing the tensile strength of the filling bar (31); the traction line (32) is located at the center of the filling bar (31); and both sides of the filling bar (31) are respectively connected to the insulating layer (22).

2. The non-metallic sheathed cable according to claim 1, characterized in that: The pulling wire (32) is arranged at an equal distance from the wire portions (2) on both sides.

3. The non-metallic sheathed cable according to claim 1, characterized in that: The pulling wire (32) is respectively arranged in parallel with the conductors (21) on both sides.

4. The non-metallic sheathed cable according to claim 1, characterized in that: The filling strip (31) is a square structure, and the pulling line (32) is arranged along the length direction of the filling strip (31).

5. The non-metallic sheathed cable according to any one of claims 1 to 4, characterized in that: The traction line (32) is a member made of aramid yarn material.

6. The non-metallic sheathed cable according to claim 4, characterized in that: The filling strip (31) is a flame-retardant PVC insulating material component.

7. The non-metallic coated cable according to claim 1, characterized in that: The interval between adjacent insulating layers (22) is greater than 3.18 mm.

8. The non-metallic sheathed cable according to claim 1, characterized in that: The conductor (21) is a copper material component.

9. The non-metallic sheathed cable according to claim 1, characterized in that: The insulating layer (22) and the sheath layer (1) are both made of polyvinyl chloride material.

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