High tensile polypropylene cable

Abstract

The application relates to the technical field of cables, in particular to a high-tension-resistance polypropylene cable which comprises the following parts: a plurality of cores arranged in a ring array; a functional layer covering all the cores; a filler filling the interspaces between the cores and the functional layer; an inner protective layer covering the functional layer; a plurality of tension-resistance profiles spirally wrapped on the inner protective layer and distributed along the axial direction of the cores; the cross section of each tension-resistance profile is V-shaped, and the opening of the V-shaped cross section faces the inner protective layer; the end portions of the adjacent two tension-resistance profiles close to the inner protective layer abut against each other, and the adjacent two tension-resistance profiles are rotationally connected with each other, the rotation axis is parallel to the length direction of the tension-resistance profiles, and a space is formed between the rotation axis and the inner protective layer; an intercepting layer covering all the tension-resistance profiles; and an outer protective layer covering the intercepting layer. The application can effectively solve the problem of low tension resistance of the existing cable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cables, in particular to a high-tension-resistance polypropylene cable. BACKGROUND

[0002] The polypropylene cable is a cable with polypropylene as the insulating layer or sheath material, which has obvious advantages in high-temperature resistance, high-frequency transmission and corrosion resistance, so its application fields are becoming more and more. With the expansion of application fields, there will inevitably be occasions where the cable is subjected to a large tension, such as the cable being pulled through the pipe or bridge during installation, the cable being frequently bent and stretched in the moving parts of the automobile or mechanical equipment, and the cable being stretched by the wind or water flow after installation.

[0003] In response to such frequent pulling, the cable needs to be designed with a tension-resistant structure to improve the strength of the cable. In the existing cables and structures, the tension-resistant parts are added inside the cable or the material strength of the cable is improved, but these ways still cannot change the local stress of the cable when the cable is subjected to tension, so the improvement of the tension resistance of the cable is limited. SUMMARY

[0004] The present application provides a high-tension-resistance polypropylene cable, which can effectively solve the problem of low tension resistance of the existing cable in the background art.

[0005] The present application provides a high-tension-resistance polypropylene cable, which comprises:

[0006] a plurality of cores arranged in a ring array;

[0007] a functional layer covering all the cores;

[0008] a filler filling the gap between the cores and the functional layer;

[0009] an inner protective layer covering the functional layer;

[0010] a plurality of tension-resistant profiles spirally wrapped on the inner protective layer and distributed along the axial direction of the cores; the cross section of each tension-resistant profile is V-shaped, and the opening is directed to the inner protective layer; the end portions of the adjacent two tension-resistant profiles close to the inner protective layer abut each other, and the adjacent two tension-resistant profiles are connected to each other by rotation, the rotation axis is parallel to the length direction of the tension-resistant profile, and a gap is formed between the rotation axis and the inner protective layer;

[0011] an interception layer covering all the tension-resistant profiles;

[0012] an outer protective layer covering the interception layer.

[0013] Further, each core comprises a conductor, a nylon layer, an insulating layer and a metal shielding layer arranged in sequence from inside to outside.

[0014] Further, in each tensile resistance profile, the abutting sections and the connecting sections are arranged alternately, and the V-shaped opening of each connecting section is bent outward at both ends; the end portions of the abutting sections of two adjacent tensile resistance profiles abut each other, and the two adjacent tensile resistance profiles are rotatably connected through the end portions of the connecting sections.

[0015] Further, the V-shaped opening of the abutting section is bent at both ends to form two first circular rings.

[0016] Further, the two first circular rings are located between the two ends of the V-shaped opening of the abutting section.

[0017] Further, the two ends of the connecting section bent outward are bent to form a second circular ring and a clamping groove, respectively, and the two adjacent tensile resistance profiles are clamped to form a rotatable connection through the second circular ring and the clamping groove.

[0018] Further, the opening of the clamping groove faces away from the inner protective layer.

[0019] Further, after all the tensile resistance profiles are wrapped around the inner protective layer, all the abutting sections and all the connecting sections are aligned in the axial direction of the inner protective layer.

[0020] Further, the side of the tensile resistance profile away from the inner protective layer is provided with a circular arc structure.

[0021] Further, the intercepting layer is a heat-shrinkable film layer wrapped around the outer side of all the tensile resistance profiles.

[0022] The technical scheme of the present application can achieve the following technical effects:

[0023] When the cable of the present application is pulled, the pulling force to which the cable is subjected can be transmitted to all the tensile resistance profiles through the connection between the tensile resistance profiles, and each tensile resistance profile can redistribute the pulling force to the outer protective layer and the inner protective layer of the cable, greatly increasing the action area of the pulling force and extending the action length to all the places on the cable where the tensile resistance profiles are present, thereby effectively dispersing the pulling force and improving the tensile resistance of the cable. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1 is a structural schematic diagram of the high tensile resistance polypropylene cable in the present application;

[0026] Figure 2A cross-sectional view of the high-tensile polypropylene cable in the present application;

[0027] Figure 3 A structural schematic diagram before the tensile profile is wrapped in the present application;

[0028] Figure 4 A structural schematic diagram after the tensile profile is wrapped in the present application;

[0029] Figure 5 A cross-sectional view after the tensile profile is wrapped in the present application;

[0030] Figure 6 A working principle diagram of the tensile profile in the present application.

[0031] The reference signs: 1, core; 2, filler; 3, functional layer; 4, inner protective layer; 5, tensile profile; 51, abutting section; 52, connecting section; 53, first circular ring; 54, second circular ring; 55, clamping groove; 56, circular arc structure; 6, intercepting layer; 7, outer protective layer. DETAILED DESCRIPTION

[0032] The basic principles and main features of the technical solutions of the present application will be described below in combination with the drawings in the embodiments of the present application. The described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0033] In the description of the present application, the words indicating the orientation or positional relationship (such as up, down, left, right, etc.) are based on the orientation shown in the drawings or some conventional positional relationship, only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the features referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0034] A high-tensile polypropylene cable, the specific structure of which is shown in Figures 1-5 and comprises the following components:

[0035] The most central part of the cable is a plurality of cores 1 for conducting electricity, which are arranged in a ring array, and the outer sides of adjacent cores 1 are in close contact with each other. If necessary, a nylon rod or a carbon fiber rod can be arranged in the center of the array of the plurality of cores 1 to provide support for the cores 1.

[0036] The outer side of the core 1 is a functional layer 3, which can cover all the cores 1; the material of the functional layer 3 can be selected according to the specific use scenario of the cable, so that the cable can be oriented to improve certain functions, for example, if the functional layer 3 is made of cross-linked polyethylene material, it can improve the corrosion resistance of the cable; if the functional layer 3 is made of ceramic silicon material, it can enhance the heat insulation performance inside and outside the cable.

[0037] The filler 2 is used to fill the gap between the core 1 and the functional layer 3, and the filler 2 is usually a filling rope made of flame-retardant PP, asbestos or the like. In addition to the flame-retardant effect, the filler 2 can also fix the core 1 and absorb the impact force from the outside, thereby protecting the core 1.

[0038] The outer side of the functional layer 3 is the inner protective layer 4, which is made of polypropylene and wraps around the functional layer 3 after the combination of the core 1, the filler 2 and the functional layer 3.

[0039] A plurality of tensile profiles 5 are arranged outside the inner protective layer 4, and the tensile profiles 5 are spirally wrapped around the inner protective layer 4. The tensile profiles 5 are parallel to each other and are distributed along the axial direction of the core 1. The angle between the length direction of each tensile profile 5 and the axial direction of the inner protective layer 4 is 10-20°. After all the tensile profiles 5 are installed, the outer side of the inner protective layer 4 is fully covered as shown in the figure. Figure 1

[0040] The cross section of each tensile profile 5 is V-shaped, and the opening of the V-shaped is directed towards the inner protective layer 4. After installation, the two ends of the V-shaped opening abut against the outer side of the inner protective layer 4. The end portions of the adjacent two tensile profiles 5 (i.e. one end of the V-shaped opening) abut against each other, and the adjacent two tensile profiles 5 are rotatably connected to each other. The rotation axis is parallel to the length direction of the tensile profile 5, and a gap is formed between the rotation axis and the inner protective layer 4.

[0041] The outer side of the tensile profile 5 is the intercept layer 6, which wraps around the tensile profile 5 after all the tensile profiles 5 are installed.

[0042] After the intercept layer 6 is installed, the outer protective layer 7 can be formed on the outer side of the intercept layer 6 by injection molding. The intercept layer 6 is used to control the shape of the inner ring of the outer protective layer 7, so that the outer protective layer 7 does not enter the tensile profile 5 during injection molding and affects the working of the tensile profile 5. The outer protective layer 7 is also made of polypropylene and can be added with ingredients according to the use requirements, such as adding benzotriazole ultraviolet resistant agent to improve the anti-aging function of the cable.

[0043] The tensile principle of the tensile profile 5 is as follows:

[0044] In the traditional structure, when the cable is pulled by external force, only the distance from the force point to the fixed point of the cable will be affected by the pulling force, and the main effect is on the outer protective layer of the cable. The local force of the cable is very large, so it is easy to be damaged. In the present cable, the tensile profile 5 is arranged outside the inner protective layer 4, and the tensile profile 5 is spirally wrapped around the inner protective layer 4. The tensile profile 5 is parallel to each other and is distributed along the axial direction of the core 1. The angle between the length direction of each tensile profile 5 and the axial direction of the inner protective layer 4 is 10-20°. After all the tensile profiles 5 are installed, the outer side of the inner protective layer 4 is fully covered as shown in the figure. Figure 6 ​As shown, when the cable is pulled to the right, due to the overall V-shaped structure of the tensile profile 5, the pulling force will cause the V-shaped opening of the tensile profile 5 to expand, and as the V-shaped opening expands, the overall thickness of the tensile profile 5 will decrease. When the tensile profile 5 deforms, the first tensile profile 5 to the left of it will not move because the V-shaped opening end of it abuts against the deformed tensile profile 5, and the rotating connection will move downward to the right with the deformed tensile profile 5. This will cause the first tensile profile 5 to the left to have a tendency to deform and flip, and the right side of the first tensile profile 5 to the left will change from an inclined state to a vertical state, so that the upper side of the right side is pressed more tightly against the outer protective layer 7 and the lower side is pressed more tightly against the inner protective layer 4. Since the second tensile profile 5 to the left also has an abutting and rotating connection relationship with the first tensile profile 5 to the left, the second tensile profile 5 will also have a tendency to deform and flip, and so on. In this way, the pulling force on the cable to the right will be distributed to all the tensile profiles 5, and each tensile profile 5 will be able to redistribute the pulling force to the outer protective layer 7 and the inner protective layer 4 of the cable, greatly increasing the area of the pulling force and extending the length of the pulling force to all the places where the tensile profiles 5 are present on the cable, thereby effectively dispersing the pulling force and avoiding damage to the cable in a local area. Similarly, when the cable is pulled to the left, the pulling force will also be distributed in this way.

[0045] Preferably, each wire core 1 comprises a conductor, a nylon layer, an insulation layer, and a metal shielding layer arranged from inside to outside. The conductor is made of multiple fine copper wires twisted together, and the twisted structure disperses stress, reduces the risk of metal fatigue fracture caused by repeated bending, and improves the utilization rate of the effective cross-sectional area. The nylon layer is a high-temperature nylon tape wrapped around the outside of the conductor, which has good high-temperature resistance. The insulation layer can be a traditional cross-linked polyethylene material or a polypropylene material. The metal shielding layer can be in the form of an aluminum foil or a copper foil wrapped around the insulation layer, which can evenly distribute the electric field and reduce the risk of partial discharge of the cable.

[0046] In order to further simplify the structure of the tensile profile 5 and save production costs, in the present cable, it is preferred that each tensile profile 5 comprises alternating abutting sections 51 and connecting sections 52, and the V-shaped opening ends of each connecting section 52 are bent outward; the end portions of the abutting sections 51 of adjacent two tensile profiles 5 abut against each other, and the adjacent two tensile profiles 5 are rotatably connected to each other through the end portions of the connecting sections 52.

[0047] In this structure, the tensile profile 5 can realize continuous manufacturing and installation forming, that is, first, the V-shaped profile is made by drawing process, then the sections of the V-shaped profile are punched and bent into the shape of the abutting section 51 and the connecting section 52 by a punching tool, and finally a plurality of tensile profiles 5 are simultaneously wound on the inner protective layer 4 using a winding device. It can be seen that the above process can greatly save the time of manufacturing and assembling the tensile profile 5, and greatly reduce the production cost. Preferably, a gap is formed between the bending sections of the abutting section 51 and the connecting section 52 to avoid mutual interference between them. The number of abutting sections 51 and connecting sections 52 is preferably set to three abutting sections 51 and three connecting sections 52 in each spiral of the tensile profile 5, so that the tensile profile 5 has a large enough rotation angle and supporting force in the tensile function as described above, to ensure the best tensile function.

[0048] Preferably, two first circular rings 53 are formed by bending at both ends of the V-shaped opening of the abutting section 51. The first circular ring 53 can increase the abutting area of the two abutting sections 51, and can increase the contact area between the abutting section 51 and the inner protective layer 4 to avoid scratching the inner protective layer 4 by the tensile profile 5. At the same time, the first circular ring 53 provides an arc-shaped contact surface for the tensile profile 5, making the rotation and homing of the tensile profile 5 more sensitive, thereby improving the response speed of the cable tensile function. Preferably, the two first circular rings 53 are located between the two ends of the V-shaped opening of the abutting section 51, so that the contact points of the first circular ring 53 and the inner protective layer 4 are always between the two ends of the V-shaped opening. Therefore, when transmitting force at the rotation connection, the tensile profile 5 is more likely to turn over, and if it is set outside the two ends of the V-shaped opening, the tensile profile 5 is more likely to deform the side wall, affecting the realization of the tensile function of the tensile profile 5.

[0049] The rotation connection between the two tensile profiles 5 can be realized by the existing rotation structure, but in order to reduce the number of components and improve the assembly efficiency, the second circular ring 54 and the clamping groove 55 are preferably formed by bending at the two ends of the outwardly bent connecting section 52, and the inner wall of the clamping groove 55 is also arc-shaped. The adjacent two tensile profiles 5 are connected by the second circular ring 54 and the clamping groove 55, so that only the second circular ring 54 needs to be pressed into the clamping groove 55 using a pressing device to complete the rotation connection and installation of the two. Preferably, the opening of the clamping groove 55 is set to face away from the inner protective layer 4, so that the second circular ring 54 can be pressed into the second circular ring 54 in the direction of the cable from the outside to the inside during installation, facilitating installation operation.

[0050] Preferably, after all the tensile profiles 5 are wrapped on the inner protective layer 4, all the abutting sections 51 and all the connecting sections 52 are respectively aligned in the axial direction of the inner protective layer 4, so as to avoid mutual interference between the abutting sections 51 and the connecting sections 52, and only need to operate along the axial direction when pressing the second circular ring 54 into the clamping groove 55 during installation, which can facilitate the installation of the tensile profiles 5.

[0051] Preferably, the tensile profiles 5 are provided with a circular arc structure 56 away from the inner protective layer 4, which can avoid scratching the inside of the outer protective layer 7, and at the same time, the width of the tensile profiles 5 at this position can be wider than that of the sharp corner structure, which can play a stronger abutting effect with the outer protective layer 7 during overturning.

[0052] Preferably, the intercepting layer 6 is a heat shrinkable film layer wrapped outside all the tensile profiles 5, so that the pressure during wrapping can be appropriately reduced to avoid excessive deformation of the tensile profiles 5 due to excessive pressure, which affects the tensile effect; after the wrapping is completed, only by blowing hot air, the heat shrinkable film layer can shrink tightly on the outside of the tensile profiles 5 to form a cylindrical intercepting film, realizing the intercepting effect during the injection molding of the outer protective layer 7.

[0053] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A high tensile polypropylene cable, characterized in that, The utility model relates to a kind of cable, including: Multiple wire cores (1) are arranged in a ring array; A functional layer (3) encloses all the wire cores (1); A filler (2) fills the gap between the wire cores (1) and the functional layer (3); An inner protective layer (4) encloses the functional layer (3); Multiple tensile profiles (5) are spirally wrapped on the inner protective layer (4) and are distributed axially along the wire cores (1);The cross section of each tensile profile (5) is V-shaped, and the opening is directed towards the inner protective layer (4);The end of the two adjacent tensile profiles (5) close to the inner protective layer (4) abuts, and the two adjacent tensile profiles (5) are connected to each other by rotation, the rotation axis is parallel to the length direction of the tensile profile (5), and a distance is formed between the rotation axis and the inner protective layer (4); An intercepting layer (6) encloses all the tensile profiles (5); An outer protective layer (7) encloses the intercepting layer (6).

2. The high tensile polypropylene cable according to claim 1, characterized in that, Each wire core (1) includes a conductor, a nylon layer, an insulating layer and a metal shielding layer arranged in order from inside to outside.

3. The high tensile polypropylene cable according to claim 1, characterized in that, In each tensile profile (5), the abutting section (51) and the connecting section (52) are arranged alternately, the V-shaped opening of each connecting section (52) is bent outward at both ends, and the end of the abutting section (51) of the two adjacent tensile profiles (5) abuts each other, and the two adjacent tensile profiles (5) are connected to each other by rotation through the end of the connecting section (52).

4. The high tensile polypropylene cable according to claim 3, characterized in that, The V-shaped opening of the abutting section (51) is bent to form two first circular rings (53).

5. The high tensile polypropylene cable according to claim 4, characterized in that, The two first circular rings (53) are located between the two ends of the V-shaped opening of the abutting section (51).

6. The high tensile polypropylene cable according to claim 3, characterized in that, The two ends of the connecting section (52) are bent outward to form a second circular ring (54) and a clamping groove (55), respectively, and the two adjacent tensile profiles (5) are connected by rotation through the second circular ring (54) and the clamping groove (55).

7. The high tensile polypropylene cable according to claim 6, characterized in that, The opening of the clamping groove (55) is directed away from the inner protective layer (4).

8. The high tensile polypropylene cable according to claim 3, characterized in that, After all the tensile profiles (5) are wrapped on the inner protective layer (4), all the abutting sections (51) and all the connecting sections (52) are aligned in the axial direction of the inner protective layer (4), respectively.

9. The high tensile polypropylene cable according to claim 1, characterized in that, The side of the tensile profile (5) away from the inner protective layer (4) is provided with a circular arc structure (56).

10. The high tensile polypropylene cable according to claim 1, characterized in that, The intercepting layer (6) is a heat-shrinkable film layer wrapped outside all the tensile profiles (5).

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