Rotary Electrode Cap Release Mechanism for Spot Welding
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Solution Overview
Problem
Existing spot-welding technologies require cumbersome and time-consuming processes for replacing worn electrode caps, often leading to damage and increased movement requirements for welding robots, which complicates the assembly line operations.
Innovation Solution
A releasing mechanism featuring a rotatable member with axially extended cylindrical niches and rollers that allows for simultaneous or sequential unlocking of electrode caps without requiring the welding gun to move between positions, reducing the need for high clamping forces and minimizing robot movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode caps are forcefully mounted using conical coupling or threaded coupling, then the electrode caps can be securely fixed to the welding gun, but the removal process becomes time-consuming and requires multiple robot movements
Solution Approach 1:
The release mechanism segments the electrode cap removal process into distinct phases: the first release element engages with the first electrode cap while the second release element engages with the second electrode cap, allowing independent and simultaneous removal of each cap without requiring sequential operations
Solution Approach 2:
The mechanism merges the removal functions for both electrode caps into a single integrated release mechanism, where both release elements are actuated by the same actuator, combining multiple removal operations into one unified action that reduces robot movements
2Productivity
If removal tools are positioned side by side to handle both electrode caps, then both caps can be removed, but the device bulk increases near assembly lines
Solution Approach 1:
The mechanism nests the two release elements within a single rotatable member, where the release elements are positioned concentrically around the rotation axis rather than side by side, allowing compact integration that reduces the overall footprint of the removal mechanism
Solution Approach 2:
The mechanism transitions from a linear side-by-side arrangement to a radial concentric arrangement around a rotation axis, utilizing the rotational dimension to achieve simultaneous cap removal while minimizing the linear bulk of the device
3Ease of operation
If high clamping forces are applied to unlock electrode caps, then the caps can be removed from forced mounting, but damage to electrode cap carriers increases
Solution Approach 1:
The release elements act as intermediary components between the actuator and the electrode caps, translating the actuator's motion into controlled unlocking actions that reduce direct mechanical stress and clamping forces on the electrode cap carriers
Solution Approach 2:
The mechanism incorporates cushioning through the cam-shaped cavity design, where the alternating sequence of more eccentric and less eccentric lengths provides a progressive unlocking action that cushions the release process and prevents sudden high-force impacts on the electrode cap carriers
Data Source
AI summary
A mechanism for releasing a pair of electrode caps from a pair of electrode cap holders of a spot welding gun. A rotatable member (11) which can be rotated about an axis (x) has an axially extended through cavity (19) with an inner cylindrical wall in which there are formed two axially spaced sets of niches (20, 21). The niches each have a curved axial wall (20c, 21c) with an eccentric profile relative to the axis of rotation (x). The niches of each set have depths and curvatures progressively increasing in a same circumferential direction. Two sets of gripping rollers (24, 25), partially received in the two sets of niches (20, 21), are provided for gripping two electrode caps (E) on a same welding gun.