Combination Weighing Control Unit Reducing Article Loss
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Solution Overview
Problem
In combination weighing apparatuses, when the target weighing value is reduced while the article type remains the same, overscale or loss of articles can occur due to the need for total discharge processing, which increases article loss.
Innovation Solution
A control unit manages the apparatus to discharge articles from all hoppers while keeping them in the conveying unit when the target weighing value is reduced, allowing the articles to be reused when the new value is set, thereby minimizing loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If total discharge processing is executed when target weighing value is reduced, then appropriate weighing value combination can be selected, but article loss increases
Solution Approach 1:
The control unit determines in advance whether the currently conveyed article is suitable for the new target weighing value before executing total discharge processing. By performing preliminary assessment of article suitability, the system可以避免 unnecessary total discharge and reduce article loss while still ensuring appropriate weighing value combination can be selected when needed.
Solution Approach 2:
The system changes the operational parameter from executing total discharge processing unconditionally to conditionally executing it based on article suitability assessment. This parameter change allows the system to maintain weighing precision by selecting appropriate combinations only when necessary, while minimizing article loss by avoiding unnecessary discharges.
2Manufacturing precision
If total discharge processing is executed to avoid overscale, then weighing accuracy is maintained, but productivity decreases
Solution Approach 1:
The control unit performs preliminary determination of article suitability before executing total discharge processing. This preliminary action allows the system to maintain weighing accuracy by ensuring appropriate article selection while avoiding unnecessary production interruptions, thus maintaining productivity.
Solution Approach 2:
By conditionally executing total discharge processing only when articles are unsuitable for the new target weighing value, the system maintains continuous useful action. The conveying unit continues to convey and the control unit continues to select combinations without unnecessary interruptions, preserving productivity while maintaining weighing accuracy through selective discharge.
3Loss of substance
If articles are discharged from hoppers while remaining in conveying unit, then article loss is reduced, but control complexity increases
Solution Approach 1:
The control unit performs preliminary determination of article suitability before controlling hopper discharge. This preliminary assessment simplifies the control logic by providing a clear decision criterion: if articles are suitable, maintain current operation; if unsuitable, execute conditional discharge from hoppers only. This reduces control complexity compared to unconditional total discharge while minimizing article loss.
Data Source
AI summary
In a combination weighing apparatus, a control unit executes combination weighing processing with a second value used as a target weighing value after controlling all of the hoppers so as to discharge the article while leaving the article in the conveying unit when the second value is less than a first value in a case where the target weighing value is changed from the first value to the second value.