Rotating Mechanism Dual Detection for Industrial Robot Positioning
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Solution Overview
Problem
Industrial robots with rotating shafts that rotate 360 degrees or more and 720 degrees or less struggle to accurately return to their original position due to errors in motor controllers and insufficient detection mechanisms.
Innovation Solution
A rotating mechanism with a supporting body, a rotating body, a motor, a first detecting mechanism, and a second detecting mechanism, where the second detecting mechanism includes a swing member and an engaging member to switch between ON and OFF at a specific position, allowing the motor controlling means to rotate the rotating body to that position for precise return to the original position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single detection piece and original position sensor are used to detect the rotating shaft position, then the device complexity is reduced, but the measurement precision is insufficient because the detection piece is detected at two positions in the rotating range
Solution Approach 1:
The detection function is segmented into two independent mechanisms: the first detecting mechanism (original position sensor and detection piece) that detects at two positions, and the second detecting mechanism (orientation sensor and swing body) that detects at one position. This segmentation allows each mechanism to perform its specific detection function without interference, resolving the contradiction between device simplicity and detection precision.
Solution Approach 2:
The swing body acts as an intermediary element that converts the rotation of the rotating shaft into a swinging motion. The orientation sensor detects the swing body's position, which indirectly indicates the rotating shaft's position. This intermediary mechanism enables precise detection of the original position by transforming the detection target from the rotating shaft directly to the swing body's oscillating motion.
2Reliability
If the motor controller loses track of the rotating position due to errors, then the reliability of position tracking deteriorates, but no method is provided to return the rotating shaft to the original position
Solution Approach 1:
The system uses feedback from both detecting mechanisms to determine when the rotating shaft has returned to the original position. The first detecting mechanism provides feedback on the detection piece's position, while the second detecting mechanism provides feedback on the swing body's orientation. When both feedback signals indicate the correct position, the system confirms the rotating shaft has returned to the original position, enabling reliable error recovery.
Solution Approach 2:
The patent establishes a predetermined return method that is prepared in advance for when the motor controller loses track of position. The controlling means is pre-programmed with the logic to rotate the shaft in a specific direction and use both detecting mechanisms to confirm when the original position is reached. This preliminary preparation ensures that even after errors occur, the system can reliably return to the correct position without requiring complex real-time decision-making.
3Adaptability or versatility
If the rotating shaft rotates 360 degrees or more and 720 degrees or less, then the adaptability of the rotating mechanism is increased, but the difficulty of detecting and measuring the original position increases
Solution Approach 1:
The system dynamically adapts to the rotating shaft's position within its 360-720 degree range by using the swing body's oscillating motion. As the rotating shaft rotates through its extended range, the swing body swings accordingly, and the orientation sensor continuously tracks this swing. This dynamic detection approach allows the system to accurately identify the original position regardless of how many full rotations the shaft has completed, maintaining detection accuracy across the full adaptable range.
Data Source
AI summary
A rotating mechanism which returning a rotating body to an original position. The first detecting mechanism for detecting that the rotating body is in the original position is provided with a first section-to-be-detected affixed to the rotating body and the first detecting section affixed to a supporting body. A second detecting mechanism is provided with a swing member attached to the supporting body, an engaging member that lets the swing member swing, a second section-to-be-detected affixed to the swing member, and a second detecting section affixed to the supporting body. The first detecting section detects the first section-to-be-detected at one or two positions, and the second detecting section switches between ON and OFF at one position. The rotating body is first rotated to the position at which the second detecting section switches between ON and OFF, in order to return the rotating body to its original position.