A highly durable, anti-interference tow chain cable

Abstract

The utility model provides a kind of high durable anti-interference drag chain cable, including the reinforcing core that is sequentially arranged from inside to outside, conductor unit, shielding layer, buffer layer and outer sheath;Conductor unit is multiple, and each conductor unit includes conductor core wire and the insulating layer of covering the conductor core wire, the recess is equipped on the insulating layer surface;Each conductor unit is respectively covered shielding layer outside, and shielding layer includes inner layer shield and outer layer shield;Buffer layer covers all conductor unit, and bubble hole is equipped in buffer layer inside;Outer sheath covers buffer layer, and anti-skid line is equipped on outer sheath outer surface.The utility model is through the spiral groove on the insulating layer surface and aramid fiber reinforcing core located in the center of cable, when cable reciprocating bending, evenly disperses mechanical stress;Significantly reduce stress concentration, avoid conductor fracture and insulating layer aging, to improve the reliability and bending life of cable.

Description

Technical Field

[0001] This utility model belongs to the field of drag chain cable technology, specifically a high-durability, anti-interference drag chain cable. Background Technology

[0002] Drag chain cables, as the core transmission carrier of industrial automation equipment, undertake the dual functions of power supply and signal control. In high-dynamic scenarios such as CNC machine tools and robotic production lines, cables need to withstand dozens of reciprocating bends, axial tensions, and mechanical frictions per minute. Their reliability directly affects the operating accuracy and maintenance costs of the equipment.

[0003] Currently, mainstream drag chain cables generally suffer from the following technical bottlenecks:

[0004] 1. Traditional structures use a single PVC or rubber sheath, which is prone to cracking due to material fatigue during long-term bending. More importantly, the cable center lacks tensile support, and bending stress concentrates at the conductor-insulation interface, causing the conductor to undergo metal lattice fracture due to repeated stress concentration; the insulation layer ages faster due to plastic deformation.

[0005] 2. Industrial environments contain strong electromagnetic interference sources such as frequency converters and servo motors. Existing shielding layers mostly use single aluminum foil longitudinal wrapping or copper wire weaving. Aluminum foil is prone to gap effects due to bending in the high-frequency range, while single-layer weaving is not efficient enough in shielding low-frequency magnetic fields; therefore, it is impossible to form full-band shielding, resulting in increased signal bit error rate and large deviations in the positioning accuracy of precision equipment.

[0006] 3. Traditional sheath materials become brittle below -20℃ and soften above 80℃, and have a low abrasion resistance coefficient. Continuous friction within the cable chain groove results in a large monthly average wear of the sheath, and oil penetration further accelerates material swelling and failure. Utility Model Content

[0007] The purpose of this invention is to provide a highly durable and anti-interference drag chain cable that can solve stress distribution problems while providing good electromagnetic shielding.

[0008] The high-durability, anti-interference drag chain cable provided by this utility model includes, from the inside out, a reinforcing core, conductor units, a shielding layer, a buffer layer, and an outer sheath; there are multiple conductor units, each conductor unit includes a conductor core wire and an insulation layer covering the conductor core wire, and the surface of the insulation layer is provided with grooves; each conductor unit is covered by a shielding layer, which includes an inner shielding layer and an outer shielding layer; the buffer layer covers all conductor units, and the buffer layer has air bubbles inside; the outer sheath covers the buffer layer, and the outer surface of the outer sheath is provided with anti-slip textures.

[0009] In one embodiment of the aforementioned drag chain cable, the reinforcing core is located at the geometric center of the cable, is made of multiple strands of aramid fibers twisted together, and is covered with a polyimide film.

[0010] In one embodiment of the aforementioned drag chain cable, the number of conductor units is 4 to 12 groups, which are evenly distributed around the central reinforcing element. Each group of conductor units consists of 2 to 5 insulated wire cores twisted together, and the twisting direction is consistent with the cable cabling direction.

[0011] In one embodiment of the aforementioned drag chain cable, the single conductor core is composed of a bundle of tinned copper wires with a diameter of 0.1 to 0.2 mm, and the bundle pitch is 8 to 10 times the outer diameter of the conductor core.

[0012] In one embodiment of the aforementioned drag chain cable, the insulation layer is made of modified polyetheretherketone material extruded and wrapped around the conductor core wire. The grooves on the surface of the insulation layer are spiral-shaped, with a groove depth of 0.05 mm to 0.1 mm and a pitch of 1.0 to 1.5 times the outer diameter of the insulation layer.

[0013] In one embodiment of the aforementioned drag chain cable, the inner shield is an aluminum-plastic composite tape, which is overlapped in a longitudinal wrapping manner, with an overlap width of not less than 25% of the bandwidth; the outer shield is a metal wire braided mesh with a braiding density of not less than 90%.

[0014] In one embodiment of the aforementioned drag chain cable, the buffer layer is made of silicone rubber material with a Shore hardness of 40A to 50A, a thickness of 0.3mm to 0.5mm, a bubble pore diameter of 0.1mm to 0.2mm, and a bubble pore volume ratio of 15% to 20%.

[0015] In one embodiment of the aforementioned drag chain cable, the outer sheath is made of TPU / PTFE blend material, and the anti-slip pattern shown is a diamond pattern.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. The aramid fiber reinforcing core located at the center of the cable and the spiral grooves on the surface of the insulation layer evenly distribute mechanical stress when the cable is bent back and forth; significantly reducing stress concentration, avoiding conductor breakage and insulation aging, thereby improving the reliability and bending life of the cable;

[0018] 2. The double-layer combination of aluminum-plastic composite strip longitudinal wrapping and tinned copper wire braided mesh forms a layered shielding mechanism; the electromagnetic interference attenuation is increased to more than 60dB, effectively isolating external electromagnetic signals and internal crosstalk, ensuring the stability of signal transmission, and is especially suitable for high-precision control environments, solving the shortcomings of the existing single shielding structure.

[0019] 3. By combining the low-hardness silicone rubber material and uniformly distributed air bubbles in the buffer layer with the TPU / PTFE blend material of the outer sheath and the diamond-shaped anti-slip texture on the surface, the gradient optimization of shock absorption and wear resistance is achieved. Compared with traditional PVC, the wear resistance is improved by 3-5 times, absorbing external impacts and reducing friction loss. At the same time, it can work stably in a temperature range of -40℃ to 120℃, and enhances the resistance to oil and chemical corrosion, making it suitable for variable industrial environments and extending the overall life of the cable. Attached Figure Description

[0020] Figure 1 This is a cross-sectional structural diagram of one embodiment of the present invention.

[0021] Figure 2 for Figure 1 A magnified schematic diagram of the middle conductor unit.

[0022] Figure 3 This is a side view of the cable in this embodiment.

[0023] The attached figures are labeled as follows:

[0024] 1-Reinforcing core, 2-Polyimide film, 3-Conductor core wire, 4-Insulation layer, 5-Spiral groove, 6-Aluminum-plastic composite strip, 7-Tin-plated copper wire braided mesh, 8-Buffer layer, 9-Bubble holes, 10-Outer sheath, 11-Rhombus anti-slip texture. Detailed Implementation

[0025] The relevant technical solutions will now be clearly and completely described with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments, and not all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0026] like Figure 1 As shown, the high-durability, anti-interference drag chain cable disclosed in this embodiment has a multi-layer coaxial structure, including a reinforcing core 1, a conductor unit, a shielding layer, a buffer layer 8, and an outer sheath 10 arranged sequentially from the inside out. Each layer is tightly bonded together through physical wrapping or extrusion processes to form an integrated cable structure that is resistant to bending and interference.

[0027] The reinforcing core 1 is located at the geometric center of the cable and is made of multiple strands of aramid fibers twisted together, with a polyimide film 2 covering the surface. The film is fixed to the surface of the aramid fibers by hot melt bonding to improve the overall tensile strength and bending stability of the cable and prevent the cable from being overstretched or deformed during reciprocating motion.

[0028] Five groups of conductor units are evenly distributed around the reinforcing core in the circumferential direction. Each group consists of three insulated wire cores twisted together, with the twisting direction consistent with the cabling direction.

[0029] like Figure 2 As shown, the single conductor core 3 is composed of stranded tinned copper wire with a diameter of 0.15mm, and the stranding pitch is 9 times the outer diameter of the conductor core.

[0030] The insulation layer 4 is made of modified polyetheretherketone material extruded and wrapped around the conductor core 3. Its surface is machined with a spiral groove 5 with a depth of 0.08 mm and a groove pitch of 1.2 times the outer diameter of the insulation layer. The spiral groove can reduce stress concentration between the insulation layer and the conductor core when bending.

[0031] Each conductor unit is covered by a shielding layer, which consists of an inner aluminum-plastic composite strip 6 and an outer tin-plated copper wire braided mesh 7, forming a double-layer shielding structure.

[0032] The aluminum-plastic composite strip 6 is overlapped in a longitudinal wrapping manner, with an overlap width of not less than 25% of the strip width; the tin-plated copper wire braided mesh 7 is woven with tin-plated copper wire with a diameter of 0.13mm and a weaving density of 92%, and is bonded to the aluminum-plastic composite strip 6; it is used to isolate external electromagnetic interference and internal signal crosstalk.

[0033] The buffer layer 8 encloses all conductor units and is made of silicone rubber material with a Shore hardness of 45A and a thickness of 0.4mm. Its interior is uniformly distributed with air bubbles 9 of 0.15mm in diameter, accounting for 18% of the volume. The buffer layer is set to absorb external impacts and vibrations and reduce frictional losses during bending.

[0034] The outer sheath 10 covers the buffer layer 8, which is made of TPU / PTFE blend material. It achieves gradient performance through a double-layer co-extrusion process, with the inner layer focusing on flexibility and the outer layer focusing on abrasion resistance. The outer surface of the outer sheath is laser-engraved with diamond-shaped anti-slip texture 11 to improve the cable's abrasion resistance and grip stability.

[0035] In this embodiment, the conductor units can be evenly distributed in 4-12 groups around the reinforcing core, and each group can be formed by twisting 2-5 insulated wire cores together; the diameter of a single conductor core wire can be 0.1-0.2 mm, and the stranding pitch can be 8-10 times the diameter of the conductor core wire; the groove depth on the surface of the insulation layer can be 0.05-0.1 mm; the overlap rate of the aluminum-plastic composite tape is not less than 25%; the weaving density of the tinned copper wire braided mesh is not less than 90%, and the diameter of a single wire can be 0.12-0.15 mm; the Shore hardness of the buffer layer material can be 40-50A, the thickness is 0.3-0.5 mm, the diameter of the air bubbles inside the buffer layer can be 0.1-0.2 mm, and the volume ratio of the air bubbles is 15%-20%.

[0036] This cable achieves high durability and interference resistance through mechanical gradient optimization and electromagnetic layered shielding.

[0037] 1. The aramid fibers of the reinforcing core provide axial rigid support, which, combined with the spiral grooves of the insulation layer, guides stress to be dispersed along the spiral path of the grooves when bending, avoiding stress concentration at the interface between the conductor core and the insulation layer.

[0038] 2. The aluminum-plastic composite belt reflects high-frequency interference through the metal layer, and the tin-plated copper wire woven mesh forms a Faraday cage to absorb low-frequency magnetic fields. The double-layer structure makes the electromagnetic attenuation reach 60dB.

[0039] 3. The bubble pores of the buffer layer absorb impact kinetic energy through compression deformation, and the PTFE outer layer of the outer sheath forms a hard and wear-resistant surface with the diamond-shaped anti-slip texture, thereby improving service life under dynamic working conditions.

[0040] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although detailed descriptions have been provided with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A highly durable, anti-interference drag chain cable, characterized in that: It includes, from the inside out, a reinforcing core, a conductor unit, a shielding layer, a buffer layer, and an outer sheath; There are multiple conductor units, each conductor unit includes a conductor core wire and an insulating layer covering the conductor core wire, and the surface of the insulating layer is provided with grooves; each conductor unit is covered with a shielding layer, which includes an inner shielding layer and an outer shielding layer; a buffer layer covers all conductor units, and the buffer layer has bubble holes inside; an outer sheath covers the buffer layer, and the outer surface of the outer sheath is provided with anti-slip textures.

2. The high-durability, anti-interference drag chain cable as described in claim 1, characterized in that: The reinforcing core is located at the geometric center of the cable and is made of multiple strands of aramid fibers twisted together, with a polyimide film covering its surface.

3. The high-durability, anti-interference drag chain cable as described in claim 1, characterized in that: The number of conductor units is 4 to 12 groups, which are evenly distributed around the reinforcing core. Each group of conductor units consists of 2 to 5 insulated wire cores twisted together, and the twisting direction is consistent with the cable cabling direction.

4. The high-durability, anti-interference drag chain cable as described in claim 1, characterized in that: The conductor core is composed of strands of tinned copper wire with a diameter of 0.1 to 0.2 mm, and the stranding pitch is 8 to 10 times the outer diameter of the conductor core.

5. The high-durability, anti-interference drag chain cable as described in claim 1, characterized in that: The insulation layer is made of modified polyether ether ketone material extruded to cover the conductor core wire. The grooves on the surface of the insulation layer are spiral-shaped, with a groove depth of 0.05 mm to 0.1 mm and a pitch of 1.0 to 1.5 times the outer diameter of the insulation layer.

6. The high-durability, anti-interference drag chain cable as described in claim 1, characterized in that: The inner shield is an aluminum-plastic composite strip, which is overlapped in a longitudinal wrapping manner, with an overlap width of not less than 25% of the bandwidth; the outer shield is a metal wire woven mesh with a weaving density of not less than 90%.

7. The high-durability, anti-interference drag chain cable as described in claim 1, characterized in that: The buffer layer is made of silicone rubber with a Shore hardness of 40A to 50A, a thickness of 0.3mm to 0.5mm, a bubble pore diameter of 0.1mm to 0.2mm, and a bubble pore volume ratio of 15% to 20%.

8. The high-durability, anti-interference drag chain cable as described in claim 1, characterized in that: The outer sheath is made of TPU / PTFE blend material, and the anti-slip pattern shown is a diamond pattern.

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