High-tensile polypropylene cable

Abstract

The invention relates to the technical field of cables, in particular to a high-tensile polypropylene cable, which comprises a plurality of wire cores arranged in a ring array; a functional layer wrapping the wire core; the filling material is used for filling a gap between the wire core and the functional layer; the inner protective layer wraps the functional layer; the plurality of tensile profiles are spirally wound on the inner protection layer and are distributed along the axial direction of the wire core; the cross section of each tensile profile is V-shaped, and the opening of each tensile profile faces the inner protective layer; the ends, close to the inner protection layer, of every two adjacent tensile profiles abut against each other, every two adjacent tensile profiles are rotationally connected with each other, the rotating shafts are parallel to the length directions of the tensile profiles, and a certain distance is formed between each rotating shaft and the inner protection layer. The interception layer wraps all the tensile profiles; and the outer protection layer wraps the interception layer. The problem that an existing cable is low in tensile property can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a high-tensile polypropylene cable. Background Art

[0002] A polypropylene cable is a cable that uses polypropylene as an insulating layer or sheath material. It has significant advantages in high-temperature resistance, high-frequency transmission, and corrosion-resistant scenarios, so its application fields are also increasing. With the expansion of application fields, there will inevitably be occasions where the cable is pulled strongly, such as when the cable may need to be pulled through pipes or cable trays during installation, when the moving parts of automobiles or mechanical equipment require frequent bending and stretching of the cable, and when the cable is stretched due to the driving of wind or water flow after installation, etc.

[0003] In response to this situation of being frequently pulled, a tensile structure needs to be designed inside the cable to improve the strength of the cable. In existing cables and structures, mainly by adding tensile members inside the cable or improving the material strength of the cable, but when the cable is pulled, these methods still do not change the local stress situation of the cable, so the improvement of the tensile performance of the cable is limited. Summary of the Invention

[0004] The present invention provides a high-tensile polypropylene cable, which can effectively solve the problem of low tensile performance of existing cables in the background art.

[0005] A high-tensile polypropylene cable provided by the present invention includes: Multiple wire cores arranged in an annular array; A functional layer that wraps all the wire cores; Filler that fills the gap between the wire cores and the functional layer; An inner protective layer that wraps the functional layer; Multiple tensile profiles spirally wrapped around the inner protective layer and axially distributed along the wire cores; the cross-section of each tensile profile is V-shaped, and the opening faces the inner protective layer; the ends of adjacent two tensile profiles close to the inner protective layer abut against each other, and adjacent two tensile profiles are rotatably connected to each other, the rotation axis is parallel to the length direction of the tensile profile, and there is a distance between the rotation axis and the inner protective layer; An interception layer that wraps all the tensile profiles; An outer protective layer that wraps the interception layer.

[0006] Further, each wire core includes a conductor, a nylon layer, an insulating layer, and a metal shielding layer arranged in sequence from the inside to the outside.

[0007] Further, each tensile profile includes alternately arranged abutting segments and connecting segments. Both ends of the V-shaped opening of each connecting segment are bent outward; the end portions of the abutting segments of two adjacent tensile profiles abut against each other, and two adjacent tensile profiles are rotatably connected through the end portions of the connecting segments.

[0008] Further, both ends of the V-shaped opening of the abutting segment are bent to form two first circular rings.

[0009] Further, the two first circular rings are located between both ends of the V-shaped opening of the abutting segment.

[0010] Further, the two ends bent outward of the connecting segment are respectively bent to form a second circular ring and a clamping groove. Two adjacent tensile profiles are clamped and connected through the second circular ring and the clamping groove to form a rotatable connection.

[0011] Further, the opening of the clamping groove faces away from the direction of the inner protective layer.

[0012] Further, after all the tensile profiles are wound around the inner protective layer, all the abutting segments and all the connecting segments are respectively aligned in the axial direction of the inner protective layer.

[0013] Further, an arc structure is arranged on the side of the tensile profile away from the inner protective layer.

[0014] Further, the interception layer is a heat-shrinkable film layer wrapped around the outside of all the tensile profiles.

[0015] Through the technical solution of the present invention, the following technical effects can be achieved: When the cable of the present invention is pulled, the tensile force received by the cable can be transmitted to all the tensile profiles through the connection between the tensile profiles, and each tensile profile can redistribute the tensile force to the outer protective layer and the inner protective layer of the cable, greatly increasing the acting area of the tensile force, and the acting length can extend to all places on the cable where there are tensile profiles, so as to effectively disperse the tensile force and improve the tensile resistance of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of the high-tensile polypropylene cable in the present invention; Figure 2 It is a cross-sectional view of the high-tensile polypropylene cable in the present invention; Figure 3Schematic diagram of the structure of the tensile profile before wrapping in the present invention; Figure 4 Schematic diagram of the structure of the tensile profile after wrapping in the present invention; Figure 5 Cross-sectional view of the tensile profile after wrapping in the present invention; Figure 6 Working principle diagram of the tensile profile in the present invention.

[0018] Reference numerals: 1, wire core; 2, filler; 3, functional layer; 4, inner protective layer; 5, tensile profile; 51, abutting section; 52, connecting section; 53, first ring; 54, second ring; 55, card slot; 56, arc structure; 6, interception layer; 7, outer protective layer. Detailed implementation manners

[0019] The following will describe the basic principles and main features of the technical solutions of the present invention in conjunction with the drawings in the embodiments of the present invention. The following will be described more intuitively through one or more embodiments. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0020] In the description of the present invention, 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 relationships, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated features must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0021] A high-tensile polypropylene cable, the specific structure of which is as Figures 1 to 5 shown, including the following components: Located at the very center of the cable are multiple wire cores 1 for conducting electricity. The multiple wire cores 1 are arranged in an annular array, and the outer sides of adjacent wire cores 1 are in contact with each other. If necessary, a nylon rod or a carbon fiber rod can be provided at the center of the array of the multiple wire cores 1 to provide support for the wire cores 1.

[0022] Located outside the wire core 1 is the functional layer 3. The functional layer 3 can wrap all the wire cores 1; the material of the functional layer 3 will be selected according to the specific use scenario of the cable, so that the cable can be directionally improved in a certain function. For example, if the functional layer 3 is made of cross-linked polyethylene material, the corrosion resistance of the cable can be improved; if the functional layer 3 is made of ceramic silicon material, the heat insulation performance inside and outside the cable can be enhanced.

[0023] The filler 2 is used to fill the gap between the core 1 and the functional layer 3. The filler 2 is usually a filling rope made of materials such as flame-retardant PP and asbestos. In addition to playing a flame-retardant role, the setting of the filler 2 can also ensure the fixation of the core 1 and absorb the impact force from the outside world on the cable, thereby playing a role in protecting the core 1.

[0024] Outside the functional layer 3 is the inner protective layer 4. After the core 1, the filler 2, and the functional layer 3 are combined, it will wrap around the circumference of the functional layer 3. The inner protective layer 4 is made of polypropylene.

[0025] Outside the inner protective layer 4, there are multiple tensile profiles 5 arranged. The tensile profiles 5 will be spirally wound around the inner protective layer 4. The multiple tensile profiles 5 are parallel to each other and are axially distributed along the core 1. The angle between the length direction of each tensile profile 5 and the axis of the inner protective layer 4 is 10 - 20°. After all the tensile profiles 5 are installed, they will be in the form as Figure 1 shown to cover the outer surface of the inner protective layer 4.

[0026] The cross-section of each tensile profile 5 is V-shaped, and the opening of the V-shape faces the inner protective layer 4. After installation, the two ends of the V-shaped opening will abut against the outer surface of the inner protective layer 4; the ends of adjacent two tensile profiles 5 close to the inner protective layer 4 (i.e., one end of the V-shaped opening) will abut against each other, and adjacent two tensile profiles 5 are rotatably connected. The rotation axis is parallel to the length direction of the tensile profile 5, and there is a certain distance between the rotation axis and the inner protective layer 4.

[0027] Outside the tensile profile 5 is the interception layer 6, which will wrap around the tensile profile 5 after all the tensile profiles 5 are installed.

[0028] After the interception layer 6 is set, the outer protective layer 7 can be formed by injection molding outside the interception layer 6. The interception layer 6 is used to control the shape of the inner circle of the outer protective layer 7, so that the outer protective layer 7 will not enter the tensile profile 5 during injection molding and affect the operation of the tensile profile 5. The outer protective layer 7 is also made of polypropylene, and components can be added according to the usage requirements, such as adding benzotriazole ultraviolet absorbers to improve the anti-aging function of the cable.

[0029] The tensile principle of the tensile profile 5 is as follows: Under the traditional structure, when the cable is pulled by an external force, usually only the distance from the cable stress point to the fixed point on the cable will be affected by the tensile force, and it mainly acts on the outer protective layer of the cable. The local stress on the cable will be very large, so it is easy to have damage problems. In this cable, as Figure 6As shown, when the cable is pulled to the right, since the tensile profile 5 is in a V-shape as a whole, the pulling force will drive a local tensile profile 5 to produce such deformation that the V-shaped opening expands, and as the V-shaped opening expands, the overall thickness of the tensile profile 5 will become smaller. Then, when this tensile profile 5 is deformed, the first tensile profile 5 on its left will not move because its V-shaped opening end presses against the deformed tensile profile 5, and the rotating connection will move to the lower right along with the deformed tensile profile. In this way, the first tensile profile 5 on the left will have a tendency to flip and deform, and the right side of the first tensile profile 5 on the left will change from an inclined state to a vertical state. This makes the upper part of this side more tightly pressed against the outer protective layer 7, and the lower part more tightly pressed against the inner protective layer 4. Since the second tensile profile 5 on the left is also in contact and rotationally connected with the first tensile profile 5 on the left, the second tensile profile 5 will also tend to flip and deform. Similarly, when the cable is pulled to the right, it will be distributed to all tensile profiles 5, and each tensile profile 5 can redistribute the tensile force to the outer protective layer 7 and inner protective layer 4 of the cable, greatly increasing the area of action of the tensile force, and the effective length can be extended to all places on the cable where the tensile profile 5 is located, thereby effectively dispersing the tensile force and preventing local damage to the cable. Similarly, when the cable is pulled to the left, the tensile force will also be distributed in this way.

[0030] Preferably, each wire core 1 includes a conductor, a nylon layer, an insulating layer and a metal shielding layer arranged in sequence from the inside to the outside. The conductor is formed by spirally twisting a plurality of fine copper wires. The twisted structure disperses the stress, can reduce the risk of metal fatigue fracture caused by repeated bending, and improve 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 insulating layer can be a traditional cross-linked polyethylene material, or a polypropylene material can be used. The metal shielding layer can be in the form of an insulating layer wrapped with aluminum foil or copper foil. The metal shielding layer can evenly distribute the electric field and reduce the risk of local discharge in the cable.

[0031] In order to further simplify the structure of the tensile profile 5 and save production costs, in this cable, it is preferred to provide alternating abutment sections 51 and connecting sections 52 in each tensile profile 5, and the two ends of the V-shaped opening of each connecting section 52 are bent outward; the ends of the abutment sections 51 of two adjacent tensile profiles 5 abut against each other, and the two adjacent tensile profiles 5 are rotatably connected to each other through the ends of the connecting section 52.

[0032] Under this structure, the tensile profile 5 can achieve continuous manufacturing and installation forming, that is: first, a V-shaped profile is produced through a drawing process, and then each section of the V-shaped profile is stamped and bent into the shapes of the abutting section 51 and the connecting section 52 using a stamping tool. Finally, multiple tensile profiles 5 are simultaneously wound around the inner protective layer 4 using a winding device. It can be seen that the above process can greatly save the time for manufacturing and assembling the tensile profile 5 and greatly reduce the production cost. It is best to process a certain gap between the bent sections of the abutting section 51 and the connecting section 52 to avoid mutual interference between the two. The number of the abutting section 51 and the connecting section 52 is preferably set such that in one turn of the helix of each tensile profile 5, there are three abutting sections 51 and three connecting sections 52, so that the tensile profile 5 can have a large enough rotation angle and supporting force in the tensile function as described above, ensuring the best tensile function.

[0033] Preferably, two first rings 53 are bent at both ends of the V-shaped opening of the abutting section 51. The first rings 53 can increase the abutting area between the two abutting sections 51, and can also increase the contact area between the abutting section 51 and the inner protective layer 4 to prevent the tensile profile 5 from scratching the inner protective layer 4. At the same time, the first rings 53 provide an arc-shaped contact surface for the tensile profile 5, making the rotation and return of the tensile profile 5 more sensitive, thereby improving the response speed of the cable's tensile function. Preferably, the two first rings 53 are located between the two ends of the V-shaped opening of the abutting section 51, so that the contact points between the first rings 53 and the inner protective layer 4 will also always be between the two ends of the V-shaped opening. Then, when transmitting force at the rotational connection, the tensile profile 5 will be more likely to generate a flipping trend. If it is set outside the two ends of the V-shaped opening, the tensile profile 5 will be more likely to generate a sidewall deformation trend, affecting the realization of the tensile function of the tensile profile 5.

[0034] The rotational connection between two tensile profiles 5 can be achieved through an existing rotational structure. However, in order to reduce the number of components and improve the assembly efficiency, in this cable, it is preferably to respectively provide a second ring 54 and a card slot 55 formed by bending at the two outwardly bent ends of the connecting section 52. The inner wall of the card slot 55 is also arc-shaped. Adjacent two tensile profiles 5 are rotationally connected by snapping the second ring 54 into the card slot 55. In this way, during installation, only a pressing device is needed to press the second ring 54 into the card slot 55 to complete the installation of their rotational connection. Preferably, the opening of the card slot 55 is set to face away from the inner protective layer 4, so that the second ring 54 can be pressed into the second ring 54 in the direction from the outside to the inside of the cable during installation, facilitating the installation operation.

[0035] Preferably, after all the tensile profiles 5 are wrapped around the inner protective layer 4, all the abutting segments 51 and all the connecting segments 52 are axially aligned with each other on the inner protective layer 4, so as to avoid mutual interference between the abutting segments 51 and the connecting segments 52. Moreover, when the second ring 54 is pressed into the clamping groove 55 during installation, only axial operation is required, which can facilitate the installation of the tensile profile 5 more conveniently.

[0036] Preferably, an arc structure 56 is provided on the side of the tensile profile 5 away from the inner protective layer 4, which can avoid scratching the inside of the outer protective layer 7. At the same time, the width of the tensile profile 5 here can be made wider compared with the sharp corner structure, and a stronger abutting effect can be achieved with the outer protective layer 7 during flipping.

[0037] Preferably, the interception layer 6 is a heat-shrinkable film layer wrapped around the outside of all the tensile profiles 5. In this way, the winding pressure can be appropriately reduced during winding, avoiding excessive pressure on the tensile profiles 5 and preventing excessive deformation that may affect their tensile effect. After winding, only by blowing hot air, the heat-shrinkable film layer can shrink and tightly adhere to the outside of the tensile profiles 5 to form a cylindrical interception film, achieving the interception effect during the injection molding of the outer protective layer 7.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-tensile polypropylene cable, characterized in that, Comprising: Multiple wire cores (1), arranged in an annular array; A functional layer (3) that encloses all of the wire cores (1); A filler (2) that fills the gap between the wire cores (1) and the functional layer (3); An inner protective layer (4) that encloses the functional layer (3); Multiple tensile profiles (5), spirally wound around the inner protective layer (4) and axially distributed along the wire cores (1); the cross-section of each tensile profile (5) is V-shaped, and the opening faces the inner protective layer (4); the ends of adjacent tensile profiles (5) close to the inner protective layer (4) abut against each other, and adjacent tensile profiles (5) are rotatably connected to each other, the rotation axis is parallel to the length direction of the tensile profile (5), and there is a distance between the rotation axis and the inner protective layer (4); An interception layer (6) that encloses all of the tensile profiles (5); An outer protective layer (7) that encloses the interception layer (6).

2. The high-tensile polypropylene cable according to claim 1, wherein Each wire core (1) includes a conductor, a nylon layer, an insulating layer, and a metal shielding layer arranged in sequence from the inside out.

3. The high-tensile polypropylene cable according to claim 1, wherein In each tensile profile (5), there are abutting segments (51) and connecting segments (52) arranged alternately, and both ends of the V-shaped opening of each connecting segment (52) are bent outward; the ends of the abutting segments (51) of adjacent tensile profiles (5) abut against each other, and adjacent tensile profiles (5) are rotatably connected to each other through the ends of the connecting segments (52).

4. The high-tensile polypropylene cable according to claim 3, characterized in that, Two first circular rings (53) are formed by bending both ends of the V-shaped opening of the abutting segment (51).

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

6. The high-tensile polypropylene cable according to claim 3, characterized in that, Both ends of the connecting segment (52) bent outward are respectively bent to form a second circular ring (54) and a card slot (55), and adjacent tensile profiles (5) are rotatably connected through the second circular ring (54) and the card slot (55).

7. The high-tensile polypropylene cable according to claim 6, characterized in that, The opening of the card slot (55) faces 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 wound around the inner protective layer (4), all the abutting segments (51) and all the connecting segments (52) are aligned axially on the inner protective layer (4).

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

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

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