Deflection-resistant aluminum alloy core aluminum foil shielding power cable

Abstract

The utility model discloses a bending-resistant aluminum alloy core aluminum foil shielding power cable, which comprises four aluminum alloy core power wire core groups which are arranged at intervals of 90 degrees in the circumferential direction through a cross-shaped polyethylene isolation core frame and are twisted together to form a cable core, the twisting pitch of the cable core is 30mm to 55mm, each aluminum alloy core power wire core group comprises a small-diameter power wire core and a large-diameter power wire core, and the diameter of the small-diameter power wire core and the diameter of the large-diameter power wire core are smaller than that of the cross-shaped polyethylene isolation core frame. Each of the small-diameter power wire core and the large-diameter power wire core comprises an aluminum alloy conductor, a foaming EVA extruded insulating layer and an EVA lapped insulating layer, and the aluminum alloy conductor is formed by concentrically twisting an aluminum alloy single-wire inner core and a plurality of aluminum wires around the outer part of the aluminum alloy single-wire inner core; a PTFE wrapping antifriction layer, an aluminum foil shielding layer, a ferrite film wrapping layer and a polyurethane outer sheath layer are sequentially wrapped outside the cable core, and the thickness of the aluminum foil shielding layer is 6-20 microns. The power cable has better bending resistance, the aluminum foil shielding layer is not easy to crack, and the shielding performance is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a flexural resistant aluminum alloy core aluminum foil shielded power cable. Background Art

[0002] In automated industrial production lines, multi-core cables are often used in robots, mobile drive systems, etc. The electrical connection and control of small robots and electronic machines require the application of highly flexible and flex-resistant shielded cables. The outer diameters of general multi-core cables vary, and the flex resistance is poor. Under repetitive torsion and bending working conditions, the cores are prone to wire breakage and have poor durability. Moreover, the aluminum foil shielding layer is prone to cracking when subjected to repeated bending during operation, the shielding performance is unstable, and the anti-interference ability is weakened, which in turn affects the electrical characteristics of the cable. Utility Model Content

[0003] The utility model aims to solve the technical problem of providing a flexurally resistant aluminum alloy core aluminum foil shielded power cable in view of the deficiencies in the prior art. The flexurally resistant aluminum foil shielding layer has better crack resistance, and the shielding performance is more stable and the durability is good.

[0004] The utility model solves the above technical problems through the following technical solutions.

[0005] The flex-resistant aluminum alloy core aluminum foil shielded power cable comprises four aluminum alloy core power wire core groups which are arranged 90 degrees apart from each other in the circumferential direction through a cross-shaped polyethylene isolation core frame and twisted together to form a cable core. The cable core twist pitch is 30mm to 55mm. The aluminum alloy core power wire core group comprises a small-diameter power wire core and a large-diameter power wire core. Both the small-diameter power wire core and the large-diameter power wire core comprise an aluminum alloy conductor, a foamed EVA extruded insulation layer and an EVA wrapped insulation layer. The aluminum alloy conductor comprises an aluminum alloy monofilament inner core and a plurality of aluminum wires twisted concentrically around the outside of the aluminum alloy monofilament inner core. The outside of the cable core is sequentially coated with a PTFE wrapped friction reduction layer, an aluminum foil shielding layer, a ferrite film wrapped layer and a polyurethane outer sheath layer. The thickness of the aluminum foil shielding layer is 6μm to 20μm.

[0006] Preferably, the inner core wire diameter of the aluminum alloy monofilament is 0.08 mm to 0.2 mm.

[0007] Preferably, the aluminum wire has a diameter of 0.01 mm to 0.08 mm.

[0008] Preferably, the thickness ratio of the foamed EVA extruded insulation layer to the EVA wrapped insulation layer is 2:1 to 8:1.

[0009] Preferably, the PTFE wrapped anti-friction layer is a PTFE resin unidirectional spiral overlapping wrapped structure with a thickness of 100 μm to 350 μm.

[0010] Preferably, the lay direction of the aluminum wires is opposite to that of the cable cores.

[0011] Preferably, the lay length of the aluminum alloy conductor is 5 to 15 times the outer diameter of the aluminum alloy conductor.

[0012] Preferably, the outer diameter of the small-diameter power line core is smaller than the outer diameter of the large-diameter power line core.

[0013] Preferably, the thickness of the ferrite film wrapping layer is 3 μm to 8 μm.

[0014] Preferably, the thickness of the polyurethane outer sheath layer is 1 mm to 4 mm.

[0015] Beneficial effects of the utility model:

[0016] 1. Four aluminum alloy core power core groups consisting of small-diameter power cores and large-diameter power cores of unequal diameters are separated and twisted together through a cross-shaped polyethylene isolation core frame, so that the cable core structure is balanced and the cable core twist distance is optimized to 30mm to 55mm, which helps to improve flexibility and flexural resistance and has better durability. The aluminum alloy conductor is formed by twisting aluminum wire around the aluminum alloy monofilament inner core, so that the aluminum alloy conductor has good mechanical strength and flexibility, enhances flexural resistance, reduces the occurrence of wire breakage, and ensures stable and reliable electrical characteristics of the core.

[0017] 2. A double-layer shielding layer structure is formed by an aluminum foil shielding layer and a ferrite film wrapping layer, and the thickness of the aluminum foil shielding layer is optimized to 6μm to 20μm. A ferrite film wrapping layer, such as a Ni-Zn ferrite film wrapping layer, is added to the outside of the aluminum foil shielding layer to effectively alleviate stress concentration in the aluminum foil shielding layer and reduce torque. On the basis of thinning the thickness of the aluminum foil shielding layer, it helps to prevent cracking of the aluminum foil shielding layer, which is beneficial to enhance the shielding effect, improve anti-interference performance, ensure stable shielding performance, and improve durability.

[0018] 3. Aluminum alloy conductors and aluminum foil shielding layers replace traditional copper core conductors and copper foil shielding layers. Aluminum alloy conductors have creep resistance and elongation comparable to copper conductors, are safe, stable and reliable, can significantly reduce material costs, reduce procurement costs, and are conducive to widespread application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the utility model.

[0020] In the figure: 1-aluminum alloy core power line core group, 2-cross-shaped polyethylene isolation core frame, 3-small diameter power line core, 4-large diameter power line core, 5-aluminum alloy conductor, 6-foamed EVA extruded insulation layer, 7-EVA wrapped insulation layer, 8-PTFE wrapped friction reduction layer, 9-aluminum foil shielding layer, 10-ferrite film wrapped layer, 11-polyurethane outer sheath layer. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0022] like Figure 1 As shown, the flex-resistant aluminum alloy core aluminum foil shielded power cable of the embodiment of the utility model comprises four aluminum alloy core power wire core groups 1 which are arranged 90 degrees apart from each other in the circumferential direction through a cross-shaped polyethylene isolation core frame 2 and twisted together to form a cable core, and the cable core lay length is 30mm to 55mm. The aluminum alloy core power wire core group 1 comprises a small-diameter power wire core 3 and a large-diameter power wire core 4, and the outer diameter of the small-diameter power wire core 3 is smaller than the outer diameter of the large-diameter power wire core 4. The small-diameter power wire core 3 and the large-diameter power wire core 4 both comprise an aluminum alloy conductor 5, a foamed EVA extruded insulation layer 6 and an EVA wrapped insulation layer 7. The aluminum alloy conductor 5 is composed of an aluminum alloy monofilament inner core and a plurality of aluminum wires twisted concentrically around the outside of the aluminum alloy monofilament inner core. Furthermore, the lay direction of the aluminum wire is opposite to that of the cable core, and the lay length of the aluminum alloy conductor 5 is 5 to 15 times the outer diameter of the aluminum alloy conductor 5. Specifically, the inner core wire diameter of the aluminum alloy monofilament is 0.08 mm to 0.2 mm, and the wire diameter of the aluminum wire is 0.01 mm to 0.08 mm. The thickness ratio of the foamed EVA extruded insulation layer 6 to the EVA wrapped insulation layer 7 is 2:1 to 8:1.

[0023] The cable core is coated with a PTFE wrapped anti-friction layer 8, an aluminum foil shielding layer 9, a ferrite film wrapped layer 10 and a polyurethane outer sheath layer 11 in sequence, and the aluminum foil shielding layer 9 has a thickness of 6 μm to 20 μm. In one embodiment, the PTFE wrapped anti-friction layer 8 is a PTFE resin unidirectional spiral lapped wrapped structure with a thickness of 100 μm to 350 μm. The ferrite film wrapped layer 10 has a thickness of 3 μm to 8 μm. The polyurethane outer sheath layer 11 has a thickness of 1 mm to 4 mm.

[0024] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. Flex-resistant aluminum alloy core aluminum foil shielded power cable, characterized by: The invention comprises four aluminum alloy core power line core groups (1) which are arranged 90 degrees apart from each other in the circumferential direction through a cross-shaped polyethylene isolation core frame (2) and twisted together to form a cable core. The cable core twist pitch is 30 mm to 55 mm. The aluminum alloy core power line core group (1) comprises a small-diameter power line core (3) and a large-diameter power line core (4). The small-diameter power line core (3) and the large-diameter power line core (4) both comprise an aluminum alloy conductor (5), a foamed EVA extruded insulation layer (6) and an EVA wrapped insulation layer (7). The aluminum alloy conductor (5) comprises an aluminum alloy monofilament inner core and a plurality of aluminum wires twisted concentrically around the outside of the aluminum alloy monofilament inner core. The outside of the cable core is sequentially coated with a PTFE wrapped friction reduction layer (8), an aluminum foil shielding layer (9), a ferrite film wrapped layer (10) and a polyurethane outer sheath layer (11). The thickness of the aluminum foil shielding layer (9) is 6 μm to 20 μm.

2. The flex-resistant aluminum alloy core aluminum foil shielded power cable according to claim 1 is characterized in that: The inner core wire diameter of the aluminum alloy monofilament is 0.08 mm to 0.2 mm.

3. The flex-resistant aluminum alloy core aluminum foil shielded power cable according to claim 1 is characterized in that: The diameter of the aluminum wire is 0.01 mm to 0.08 mm.

4. The flex-resistant aluminum alloy core aluminum foil shielded power cable according to claim 1 is characterized in that: The thickness ratio of the foamed EVA extruded insulation layer (6) to the EVA wrapped insulation layer (7) is 2:1 to 8:

1.

5. The flex-resistant aluminum alloy core aluminum foil shielded power cable according to claim 1 is characterized in that: The PTFE wrapped anti-friction layer (8) is a PTFE resin unidirectional spiral overlapping wrapped structure and has a thickness of 100 μm to 350 μm.

6. The flex-resistant aluminum alloy core aluminum foil shielded power cable according to claim 1 is characterized by: The lay direction of the aluminum wires is opposite to that of the cable cores.

7. The flex-resistant aluminum alloy core aluminum foil shielded power cable according to claim 1 is characterized by: The lay length of the aluminum alloy conductor (5) is 5 to 15 times the outer diameter of the aluminum alloy conductor (5).

8. The flex-resistant aluminum alloy core aluminum foil shielded power cable according to claim 1 is characterized by: The outer diameter of the small-diameter power wire core (3) is smaller than the outer diameter of the large-diameter power wire core (4).

9. The flex-resistant aluminum alloy core aluminum foil shielded power cable according to claim 1, characterized in that: The thickness of the ferrite film wrapping layer (10) is 3 μm to 8 μm.

10. The flex-resistant aluminum alloy core aluminum foil shielded power cable according to claim 1, characterized in that: The thickness of the polyurethane outer sheath layer (11) is 1 mm to 4 mm.

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