Rotating Welding Torch Coupler With Conical Low-Torque Contacts
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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 MIG 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 incorporating a quick disconnect mechanism for improved usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotating connector with horizontal contact surfaces and spring biasing is used, then electrical connection is maintained, but friction increases breakaway torque and causes mechanical wear
Solution Approach 1:
The patent replaces horizontal flat contact surfaces with conical contact surfaces. The conical geometry allows the contact normal to be oriented radially outward, perpendicular to the axis of rotation, thereby eliminating the friction component that resists rotation while maintaining electrical contact through the conical interface between the connector pin and rotating stud.
Solution Approach 2:
The patent changes the geometric parameters of the contact surfaces from horizontal planes to conical surfaces with specific angles. This parameter change transforms the friction characteristics, allowing the contact force to be decomposed into radial and axial components, where the radial component maintains electrical contact and the axial component does not create rotational resistance.
2Reliability
If a rotating connector with spring biasing and contact rings is used, then electrical connection is ensured, but mechanical wear leads to torch failure
Solution Approach 1:
The conical contact surfaces reduce concentrated stress at the contact interface by distributing the load over a larger area. The conical geometry allows for self-aligning contact that reduces edge loading and minimizes wear mechanisms, thereby extending the service life of the rotating connector assembly.
Solution Approach 2:
The patent converts the potentially harmful frictional wear into a beneficial self-lubricating mechanism. The conical geometry allows for controlled sliding contact that generates heat and removes debris, while the reduced friction compared to flat surfaces means wear occurs more slowly and predictably, extending component life.
3Device complexity
If a fixed goose neck design is used, then structural simplicity is maintained, but unicable bending and flexing reduces service life
Solution Approach 1:
The patent introduces a rotating coupling mechanism that allows the goose neck to rotate independently of the unicable. This dynamic element decouples the rotational movement of the torch from the unicable, allowing the unicable to remain relatively stationary while the torch rotates, thereby eliminating bending and flexing stresses on the unicable.
Solution Approach 2:
The patent segments the torch assembly into distinct rotational and non-rotational components. The rotating stud and connector pin form a separate rotational subsystem that is mechanically decoupled from the unicable, allowing rotation to occur at the connector interface rather than being transmitted to the unicable.
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 maintaining stability during robotic operations, while enabling quick and efficient maintenance without disconnection of the unicable.
Implementation Method 1
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 need to maintain electrical communication
Implementation Method 2
constant pressure apparatus that reduces axial force requirements for maintaining electrical communication
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.