Bending-resistant and twisting-resistant cable
By introducing a spring layer into the welding cable to resist external forces, the burnout problem caused by stress fatigue of copper conductors is solved, which extends the cable life and reduces costs, and improves the working efficiency of the welding robot.
Patent Information
- Application Number
- CN202421460892.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-25
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-06-25
AI Technical Summary
During the bending and torsion process of existing welding cables, stress fatigue at the fixed end of the copper conductor leads to an increase in resistance, resulting in burnout of the conductive nozzle, short service life, and frequent replacement, which increases the operating cost of the welding robot.
A spring layer is added between the air conduit and the copper conductor layer. The spring resists external forces, weakens the stress and fatigue problems, and adopts a multi-layer structure including a non-woven fabric strip and a flame retardant insulating layer to protect the spring and copper conductor.
The service life of welding cables is extended to 12-15 months, reducing the replacement frequency, improving the working efficiency of welding robots and reducing operating costs, while increasing the current carrying capacity of the cable.
Smart Images
Figure CN223180864U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cables, in particular to a bending and torsion resistant cable. Background Art
[0002] With the rapid development of science and technology, the intelligent welding robot industry is experiencing unprecedented growth. As a critical process in the manufacturing industry, welding's automation and intelligent capabilities are crucial for improving overall manufacturing efficiency and ensuring product quality. Currently, the intelligent welding robot industry is experiencing rapid growth, finding widespread application not only in traditional sectors like automotive, shipbuilding, and aerospace, but also demonstrating significant market potential in emerging areas like new energy and electronic information technology.
[0003] With the continuous advancement of technological innovation and the continuous expansion of application areas, intelligent welding robots will play an even more important role in the manufacturing industry. At the same time, the industry is striving for independent innovation, improving product quality and service levels to meet market changes and challenges. In the actual operation of welding robots, the service life of existing welding cables is 6 to 8 months. A small number of welding cables will burn out after 4 to 6 months of operation, affecting production and product quality. Replacing welding cables every 4 months is too frequent and the equipment operating costs are too high. Through the analysis of the burned-out device cables, the specific situation is as follows:
[0004] (1) The burnt parts all appear in the conductive nozzle part of the welding robot which is often bent and twisted.
[0005] (2) It mainly manifests itself in the copper conductor fixing part of the conductive nozzle, where some copper wires are broken. When the number of broken copper wires reaches a certain amount, the resistance increases sharply, and the cable at the conductive nozzle part is burned out under a high current of 500A.
[0006] (3) Analysis of the causes of the problems is that the tension and torsional forces generated by the continuous bending, twisting and translation of the conductive nozzle are concentrated at the fixed end of the copper conductor of the conductive nozzle. Due to stress fatigue, the copper single wire breaks. When the number reaches a certain level, the resistance of the fixed part of the copper conductor continues to increase. Under a high current of 500A, the temperature of the conductive nozzle increases and it burns out. Utility Model Content
[0007] To this end, the technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide a bending and torsion resistant cable. A layer of spring is added between the air guide tube and the copper conductor layer. When the cable is subjected to external force, it is first resisted by the spring, thereby reducing the force on the welding conductor, greatly improving the service life of the welding cable and reducing the operating cost of the welding robot.
[0008] To solve the above technical problems, the present utility model provides a bend-resistant and torsion-resistant cable, comprising: an air duct, a first non-woven fabric tape, a spring layer, a sleeve, a copper conductor layer, a second non-woven fabric tape, and a flame-retardant insulating layer; the first non-woven fabric tape is wound around the surface of the air duct; the spring layer is disposed outside the first non-woven fabric tape; the sleeve is wrapped outside the spring layer; the copper conductor layer is laid outside the sleeve; the second non-woven fabric tape is wound around the outer surface of the conductor; and the flame-retardant insulating layer is disposed outside the second non-woven fabric tape.
[0009] In an embodiment of the present utility model, the spring layer comprises a plurality of springs, and the above-mentioned springs are all longitudinally wound around the outer surface of the first non-woven fabric tape.
[0010] In an embodiment of the present utility model, the number of the springs is 18.
[0011] In an embodiment of the present utility model, the diameter of the springs is 2.5 mm.
[0012] In an embodiment of the present utility model, the wire diameter of the springs is 1.0 mm.
[0013] In an embodiment of the present utility model, the copper conductor layer comprises a plurality of copper conductors, which are arranged in a circle around the outer surface of the sleeve.
[0014] In an embodiment of the present utility model, the copper conductor is made by stranding a plurality of soft copper wires.
[0015] In an embodiment of the present utility model, the diameter of the soft copper wires is 0.15 mm.
[0016] In an embodiment of the present utility model, the sleeve is a PVC sleeve.
[0017] In an embodiment of the present utility model, the flame-retardant insulating layer is made of thermoplastic vulcanized rubber TPV.
[0018] The above technical solution of the present utility model has the following advantages compared with the prior art:
[0019] A bend-resistant and torsion-resistant cable according to the present utility model adds a spring layer between the air duct and the copper conductor layer. When the welding head nozzle continuously bends, twists, and translates, the acting force is first resisted by the spring, thereby weakening the force on the welded conductor. When the spring is subjected to bending and torsional forces, the spring forms an arc, so that the stress fatigue force point is transformed into a force-bearing arc, greatly improving the service life of the welding cable. The operating life of the cable is increased to 12 - 15 months, reducing the operating cost of the welding robot. The reduction in the number of cable replacements improves the working efficiency of the welding robot. In addition, since the welding cable is provided with a spring layer, the outer diameter of the cable conductor layer increases accordingly, and the copper conductor with the same cross-section increases the current-carrying capacity of the cable. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to make the content of the present utility model easier to be clearly understood, the following further describes the present utility model in detail according to the specific embodiments of the present utility model in conjunction with the accompanying drawings, where
[0021] Figure 1 is a schematic structural diagram of the bend-resistant and torsion-resistant cable in the preferred embodiment of the present utility model;
[0022] Description of the reference numerals in the drawings: 1. Air duct; 2. First non-woven fabric tape; 3. Spring layer; 4. Sleeve; 5. Copper conductor layer; 6. Second non-woven fabric tape; 7. Flame-retardant insulating layer. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0023] The following further describes the present utility model in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the embodiments cited do not limit the present utility model.
[0024] As Figure 1 shown, a bend-resistant and torsion-resistant cable includes: an air duct 1, a first non-woven fabric tape 2, a spring layer 3, a sleeve 4, a copper conductor layer 5, a second non-woven fabric tape 6, and a flame-retardant insulating layer 7; the first non-woven fabric tape 2 is wound around the surface of the air duct 1; the spring layer 3 is arranged outside the first non-woven fabric tape 2; the sleeve 4 is wrapped outside the spring layer 3; the copper conductor layer 5 is laid outside the sleeve 4; the second non-woven fabric tape is wound around the outer surface of the conductor; the flame-retardant insulating layer 7 is arranged outside the non-woven fabric tape.
[0025] In this embodiment, the spring layer 3 includes a plurality of springs, and the above springs are all longitudinally wound around the outer surface of the first non-woven fabric tape 2.
[0026] During actual processing, the first non-woven fabric tape 2 is wrapped around the air duct 1; 18 springs are longitudinally placed outside the first non-woven fabric tape 2, with a spring diameter of Ф2.5mm and a spring wire diameter of Ф1.0. A sleeve 4 made of PVC material at 105°C is extruded outside the springs, which can effectively ensure the free expansion and contraction of the springs; then a copper conductor layer 5 is stranded outside the sleeve 4. In this embodiment, the copper conductor layer 5 includes a number of copper conductors, and the copper conductors are 32-strand stranded wires composed of soft copper wires with a diameter of Ф0.15, and each strand of stranded wire is 117 / 0.15mm; a second non-woven fabric tape 6 is wrapped outside the copper stranded wire again; a flame-retardant insulation layer 7 made of TPV elastomer flame-retardant material at 105°C is extruded on the outermost layer.
[0027] For the cable prepared by the above process, its rated voltage is 100V, the operating temperature is -20°C to +105°C, and the operating current is 500A. When the welding head contact tip is continuously bent, twisted, and translated, its acting force is first resisted by the springs, thereby weakening the force on the copper conductor layer 5. At the same time, when the spring layer 3 is subjected to bending and twisting forces, the springs will form an arc, so that the stress fatigue stress point is transformed into a stressed arc, greatly improving the service life of the welding cable; the operating life of the existing cable, which is 6 - 8 months, has been increased to 115 months, reducing the operating cost of the welding robot, and the reduction in the number of cable replacements improves the working efficiency of the welding robot.
[0028] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.
Claims
1. A bend and torsion resistant cable, characterized in that: Including: An air duct, a first non-woven fabric tape, a spring layer, a sleeve, a copper conductor layer, a second non-woven fabric tape, and a flame-retardant insulating layer; The first non-woven fabric tape is wound around the surface of the air duct; the spring layer is arranged outside the first non-woven fabric tape; the sleeve is wrapped outside the spring layer; the copper conductor layer is laid outside the sleeve; the second non-woven fabric tape is wound around the outer surface of the conductor; the flame-retardant insulating layer is arranged outside the second non-woven fabric tape; wherein, the spring layer includes a plurality of springs, and the above-mentioned springs are all longitudinally arranged around the outer surface of the first non-woven fabric tape.
2. The bend - and - torsion - resistant cable according to claim 1, wherein: The number of the springs is 18.
3. A bend-torsion resistant cable according to claim 1, characterized in that: The diameter of the springs is 2.5 mm.
4. A bend-twist resistant cable according to claim 1, characterized in that: The wire diameter of the springs is 1.0 mm.
5. A bend-torsion resistant cable according to claim 1, characterized in that: The copper conductor layer includes a plurality of copper conductors, which are arranged in a circle around the outer surface of the sleeve.
6. The bend-torsion resistant cable according to claim 5, wherein: The copper conductor is made by stranding a plurality of soft copper wires.
7. The bend - and - torsion resistant cable according to claim 6, wherein: The diameter of the soft copper wires is 0.15 mm.
8. A bend and torsion resistant cable according to claim 1, characterized in that: The sleeve is a PVC sleeve.
9. The bend-torsion resistant cable according to claim 1, wherein: The flame-retardant insulating layer is made of thermoplastic vulcanized rubber TPV.