Workpiece Position Detection Compensation Method
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Solution Overview
Problem
In manufacturing plants, the inefficiency in detecting the precise position of workpieces suspended by hangers leads to prolonged production times and reduced efficiency, especially when repeated judgments are needed about the alignment of vehicle bodies and components during assembly.
Innovation Solution
A method involving a position detection unit that records and statistically processes differences between actual and reference stop positions to calculate a compensation amount, allowing the unit to be positioned for accurate detection, thereby reducing the need for repeated fine position detection and enabling quicker assembly processes. Additionally, this method judges the necessity of hanger maintenance by monitoring compensation amounts, preventing hanger malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rough position detection is used to judge whether the difference between reference stop position and actual stop position falls within allowable range, then the detection process is simple and quick, but the position detection precision is insufficient leading to repeated judgments and prolonged production time
Solution Approach 1:
The patent applies preliminary action by pre-calculating compensation amounts based on historical position detection data before actual position detection is needed. The system stores multiple past position detection results, calculates compensation amounts in advance, and uses these pre-computed values to adjust detection positions, thereby achieving high-precision detection without time-consuming repeated measurements during production.
Solution Approach 2:
The patent implements feedback by using past position detection results to calculate compensation amounts that are fed back into the detection system. The system continuously accumulates position detection data, computes compensation values based on deviations from reference positions, and applies these compensation values to improve subsequent detection accuracy, creating a closed-loop feedback mechanism that enhances precision over time.
2Measurement precision
If fine position detection is performed repeatedly when the difference falls outside allowable range, then the position detection precision improves, but the production efficiency is significantly reduced due to multiple detection cycles
Solution Approach 1:
The system performs preliminary calculation of compensation amounts using historical data before actual detection is needed. By pre-computing these compensation values and storing them for immediate use, the system eliminates the need for repeated fine detection cycles, thereby maintaining high precision while preserving production efficiency.
Solution Approach 2:
The patent uses copying by utilizing past position detection results as reference data for calculating compensation amounts. Instead of performing new repeated measurements, the system copies and analyzes historical detection data to derive compensation values that improve current detection accuracy without requiring additional time-consuming measurement cycles.
3Measurement precision
If the position detection unit is fixed at the reference stop position, then the device complexity is low and operation is simple, but the detection accuracy decreases when the hanger has position deviations
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the detection position parameter based on calculated compensation amounts. Instead of keeping the detection unit fixed at the reference position, the system modifies the detection position parameter using compensation values derived from historical data, thereby adapting to hanger position deviations and improving detection accuracy without requiring complex mechanical adjustments.
Solution Approach 2:
The system performs preliminary calculation of compensation amounts that determine the optimal detection position before actual detection occurs. By pre-computing these position adjustments based on historical data, the system prepares the correct detection position in advance, eliminating the need for complex real-time position adjustment mechanisms while maintaining high detection accuracy.
Data Source
AI summary
The stop position of a workpiece is detected by a position detection unit. A control unit calculates and records a difference between the detected stop position (actual stop position) and a reference stop position set in advance. After recording the difference multiple times, the control unit performs a statistical processing of the differences and calculates a compensation amount based on results of the statistical processing. In the next position detecting, the position detection unit is disposed at a compensated position which is obtained by adding the compensation amount to the reference stop position, and in this state, detects the position of a predetermined portion of the workpiece.