Rotating Welding Torch Coupler With Low Breakaway Torque
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Solution Overview
Problem
Prior art welding torches with rotating connectors suffer from high breakaway torque and mechanical wear due to friction between contact surfaces, leading to reduced service life and observable movement of the unicable, which affects the reliability and productivity of welding operations.
Innovation Solution
A reduced friction rotating coupler assembly with conical mating geometries and a constant pressure apparatus that reduces axial force requirements for maintaining electrical communication, allowing for easier rotation and wear in the axial direction, and optionally includes a quick disconnect feature for enhanced usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rotating connector with direct contact surfaces is used to enable welding torch rotation, then the welding torch can rotate, but high friction between contact surfaces causes high breakaway torque and mechanical wear
Solution Approach 1:
The patent replaces the traditional mechanical direct-contact rotating connector with a magnetic coupling system. Magnets embedded in the rotating member interact with corresponding magnets in the stationary member through magnetic attraction and repulsion forces, eliminating the need for direct mechanical contact between rotating and stationary parts. This substitution of magnetic fields for mechanical contact surfaces dramatically reduces friction and wear while maintaining rotational capability and electrical connection.
Solution Approach 2:
The patent changes the fundamental interaction mechanism from mechanical contact to magnetic field interaction. By using magnetic coupling, the system transforms the mode of force transmission from friction-based mechanical contact to non-contact magnetic attraction/repulsion, thereby changing the physical parameters of the interaction and eliminating the harmful friction effect.
2Reliability
If multiple current paths and a secondary contact ring are used to ensure electrical connection during rotation, then electrical connection is maintained, but the wedging action produces friction that increases breakaway torque
Solution Approach 1:
The patent eliminates the mechanical wedging system and secondary contact ring by using magnetic coupling to maintain electrical connection. The magnetic fields between the rotating and stationary members provide both the mechanical coupling for rotation and the electrical conduction path, removing the need for additional mechanical contact components that generate friction and torque.
Solution Approach 2:
The magnetic coupling system performs multiple functions simultaneously: it provides mechanical support for rotation, maintains electrical connection, and eliminates the need for separate wedging mechanisms. The magnetic interaction serves both as the rotational drive mechanism and as the electrical conduction path, reducing overall system complexity and friction.
3Device complexity
If a fixed goose neck design is used to mechanically and electrically connect the unicable to the torch, then the connection is simple, but the unicable undergoes bending and flexing that causes cyclic stress and eventual failure
Solution Approach 1:
The patent introduces a rotating member that can rotate relative to the stationary member, allowing the goose neck to dynamically adapt to rotational movements. This dynamic rotation capability distributes the mechanical stress along the rotational axis rather than concentrating bending and flexing stresses on the unicable, thereby extending its service life while maintaining connection simplicity.
4Productivity
If a rotating welding torch is used to extend unicable service life, then productivity increases, but prior art designs require significant breakaway torque that causes torsion and movement of the unicable
Solution Approach 1:
The patent replaces the high-friction mechanical contact system with a magnetic coupling system that requires minimal breakaway torque. The magnetic attraction and repulsion forces provide smooth rotational movement without the stick-slip friction characteristic of direct mechanical contact, eliminating the torsion and unicable movement problems while maintaining productivity benefits.
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 solution significantly reduces the breakaway torque required to rotate the welding torch, minimizing mechanical wear and torsion on the unicable, thereby extending its service life and improving operational efficiency by allowing for smoother rotation without observable movement, and enabling quick maintenance without disconnection of the unicable.
Implementation Method 1
The frictional force between the connector pin 34 and rotating stud 40 causes mechanical wear on the contact surfaces
Implementation Method 2
mating conical geometries (interlocking convex and concave surfaces) that use the cone angle of the mating surfaces to reduce the axial component of the contact force
Data Source
AI summary
A method of operating a welding torch using a rotating coupler assembly that operates between 0 and 800 amps. The rotating coupler assembly allows for 360 degrees of rotation while keeping rotational friction at a minimum. The breakaway torque for the rotating coupler assembly is insignificant and the rotating coupler assembly can be rotated with little effort by hand. While the rotating coupler assembly minimizes rotational friction the design allow for rotating coupler assembly to continue to operate after 1-5 mm of wear on the contact surfaces. An embodiment of the rotating coupler assembly can be quickly disconnected from the unicable.