Cable for compound motion of servo electric torque fastener

Abstract

The present invention provides cable for compound motion of a servo electric torque fastener. The cable comprises a cable core and an outer sheath coated at the exterior of the cable core; the cable core includes four power transmission insulation wires and at least six signal control wires; each signal control wire includes a pair twist set formed by two insulation wires; a belting of the first layer of non-absorbent materials, a metal shielding layer and a belting of second layer of non-absorbent materials are arranged at the exterior of the pair twist set; the cable core includes an inner cable core and an outer cable core; the inner cable core includes two or three power transmission insulation wires and fillings; the inner cable core is coated with the belting of the non-absorbent materials; and the outer cable core is residual power transmission insulation wires and all the signal control wires. The cable for compound motion of the servo electric torque fastener has good low-temperature flexibility in the low-temperature state and cannot have the problems that the insulation wires and the outer sheath are subjected to cracking, breaking and brittle rupture so as to result in cable breakdown and cable failure.

Description

technical field [0001] The invention relates to a cable, in particular to a composite motion cable for a servo electric torque tightener. Background technique [0002] Industrial robots are equipped with "servo electric torque fasteners" on their arms for product manufacturing and assembly. Servo electric torque fasteners are also used in the assembly of other high-precision industrial equipment. The cables connecting and controlling the servo electric torque tightener perform continuous, uninterrupted bending, twisting, twisting and other movements with the continuous movement of the robot arm or drag chain system; because such cables operate at high speeds, Working under high-intensity, high-frequency, and complex continuous motion states requires long-term, stable and effective transmission functions (electricity, data, signals, etc.), which poses a problem for the bending, bending, and torsion life of cables. Great challenge. [0003] In the prior art, three cables are...

AI Technical Summary

Problems solved by technology

This three-cable control method has the following deficiencies: 1) When the cables perform high-speed, high-strength, high-frequency, and complex continuous motions with the robot arm or drag chain system, it is easy to generate mutual interaction between the cables. The phenomenon of entanglement, mutual fetters, and kinks, when such phenomena occur, the cable is easily broken, resulting in cable failure, causing the shutdown of the robot or towline system; 2) The installation and laying of the cable is very cumbersome and the installation cost is high; 3) Existing products all use PVC as the material for insulation and sheathing, but the tensile strength, tensile strength, and creep resistance of PVC are not good. Under high-intensity continuous motion operations, especially continuous stretching motion and torsion When Qurao moves, the service life of the cable is very low; 4) The shielding effect of the signal cable is not good, because it adopts a total shielding method to prevent electromagnetic interference. Although this type of shielding method can prevent external electromagnetic interference to the cable, the cable The electromagnetic interference between the internal 3 pairs of 6 cable core signal lines cannot be protected, which will lead to internal crosstalk; 5) The low temperature flexibility is not good, and it is not suitable for continuous motion at low temperature, because the insulation and protection of existing products The sheaths are all made of PVC, and due to the limitation of the material characteristics of PVC, the minimum operating temperature of PVC is only -5°C. Below this temperature, the insulation and sheath of the cable will be brittle under continuous motion, resulting in cable shock. wear, causing the cable to fail, which may endanger the safety of personnel in severe cases

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