Rotating Welding Torch Power Connector for Cable Torque Relief
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Solution Overview
Problem
Conventional fixed connections in welding torch cables lead to torsional movement limitations and mechanical wear, especially in robotic applications, causing cable failure due to rotational torque and stress concentration.
Innovation Solution
A rotating power connector that allows the welding torch body to rotate relative to the unicable, featuring a connector pin and rotating stud with electrical contact rings and bearings for stable electrical contact and mechanical support, reducing torque and mechanical wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed connections are used in welding torch cables, then the cable structure is simple and easy to manufacture, but the cable is subjected to rotational torque and stress concentration leading to mechanical failure
Solution Approach 1:
The patent applies the dynamics principle by introducing a rotating connector that allows the cable to rotate freely within the connector housing. This dynamic capability enables the cable to accommodate rotational movements during robotic welding operations without transmitting torque to the fixed cable connections, thereby preventing stress concentration and mechanical failure while maintaining connection reliability.
Solution Approach 2:
The connector is segmented into multiple functional components: a stationary outer housing, a rotating inner connector, and a cable retention mechanism. This segmentation allows the rotating connector to isolate the cable from rotational forces while maintaining electrical and fluid connections, resolving the contradiction between reliability and complexity by distributing functions across separate components.
2Reliability
If the cable is allowed to rotate freely, then mechanical wear is reduced, but electrical contact stability may be compromised
Solution Approach 1:
The rotating connector acts as an intermediary between the stationary cable and the moving torch. It provides a controlled rotation interface that maintains stable electrical contact through sliding contacts or brushless commutators while allowing the cable to rotate freely. This intermediary mechanism resolves the contradiction by decoupling the rotation freedom from electrical contact stability.
Solution Approach 2:
The patent replaces traditional mechanical sliding contacts with alternative contact mechanisms such as spring-loaded brushless commutators or magnetic coupling systems. This substitution reduces mechanical wear while maintaining electrical contact stability during rotation, addressing both requirements simultaneously.
3Productivity
If conventional fixed cables are used in robotic welding, then the system is simpler to implement, but severe mechanical wear occurs due to rotational torque
Solution Approach 1:
The rotating connector enables the cable system to dynamically adapt to robotic welding movements by allowing free rotation at the connector interface. This dynamic capability eliminates torque transmission to the cable, preventing mechanical wear and extending cable service life while maintaining uninterrupted productivity during welding operations.
Solution Approach 2:
The rotating connector provides beforehand cushioning by absorbing and isolating rotational stresses before they can transmit to the cable. This protective mechanism prevents cumulative damage from rotational torque, extending cable lifespan without impacting welding productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The rotating power connector ensures continuous electrical connection and reduces mechanical wear, extending the life of the unicable by allowing smooth rotation and relieving strain, suitable for robotic welding systems.
Implementation Method 1
a bearing arranged about the rotating stud and supporting the rotating stud
Data Source
AI summary
A rotating power connection for connecting an electrical supply power cable to an electric welding torch body is provided. In the rotating power connection, the mechanical load is carried by steel bearings, and the electric load is carried by multi-contact, spring loaded fins made out of highly conductive materials or coatings. In some examples, a rotating power connector is affixed to a torch before the power connection to a wire feeder. The rotating power connector advantageously allows for rotation of the welding torch relative to the unicable while providing continual electrical connection at the high current levels employed in welding applications.