Robotic Arm Release Mechanism for Quick Exchange
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Solution Overview
Problem
Existing robotic arm systems face challenges in efficiently and simply exchanging interchangeable arms and work heads, particularly in maintaining control rope length and tension, which is crucial for 'tip following' capabilities, especially in confined spaces, and require complex mechanisms that increase cost and wear.
Innovation Solution
A robotic arm arrangement with a releasable coupling mechanism using axial motion of control cables and ferrules, where actuators are positioned radially, allowing for linear motion of cables, and incorporating a locking mechanism to maintain tension and preloading, enabling quick and precise exchange of arms without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional rigid location and feed-through mechanisms are used for work head exchange, then mechanical and electrical connections are established, but the exchange process becomes complicated and time-consuming
Solution Approach 1:
The system is divided into modular segments: the actuator assembly, the arm assembly with ferrules, and the work head. Each segment can be independently exchanged. The control cables are segmented into discrete units that can be individually managed during exchange, allowing the arm and work head to be exchanged as a coordinated unit while retaining the same actuators and control systems.
Solution Approach 2:
The actuator assembly serves multiple functions: it provides mechanical actuation through the actuator, transmits force through the control cable, and establishes mechanical and electrical connections through the coupling arrangement. This multi-functionality reduces the number of separate mechanisms needed, simplifying the overall exchange process.
2Productivity
If control rope length and tension are not managed during arm exchange, then exchange speed is increased, but tip following capability and path precision are compromised
Solution Approach 1:
The control cables are pre-tensioned and pre-positioned within the arm structure before exchange. The ferrules are pre-positioned at predetermined locations along the control cables, ensuring that when the arm is exchanged, the cables are already in the correct state for immediate operation without requiring post-exchange adjustment.
Solution Approach 2:
The coupling arrangement automatically maintains cable tension and position during exchange. The mechanical coupling between the actuator and ferrule self-adjusts to maintain proper cable tension, eliminating the need for manual intervention to preserve tip following capability while enabling rapid exchange.
3Reliability
If multiple individual mechanisms are used for each control rope during exchange, then precise control is maintained, but the release and connect mechanisms become complex
Solution Approach 1:
Multiple control cables are merged into a single coordinated exchange process. The coupling arrangement allows simultaneous engagement or disengagement of multiple cables through a single operational action, combining what would otherwise require multiple separate mechanisms into one unified system that maintains precision while reducing complexity.
Data Source
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AI summary
A robotic arm arrangement comprises an arm having control cables extending from the base of the arm, and coupling members for coupling the cables to actuators for linear actuation of the cables. The coupling members extend radially outwardly around the arm to enable quick release and replacement of the arm.