Dispersion Table Speed Control for Combination Weighing Accuracy
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Solution Overview
Problem
The existing combination weighing apparatuses face accuracy issues in distributing articles to hoppers due to increased rotation speed when the total weight exceeds a predetermined value, leading to excessive supply and compromised accuracy.
Innovation Solution
A combination weighing apparatus that controls the rotation speed of the dispersion table based on the mass value of articles, setting it to a first speed for lighter loads and a slower second speed for heavier loads to maintain accurate distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotation speed of the dispersion table is increased to handle large total weight of articles, then the supply amount of articles to each hopper increases, but the combination accuracy deteriorates due to exceeding target input amount
Solution Approach 1:
The dispersion table's rotation speed is made dynamically adjustable based on the detected total weight of articles. The control unit automatically selects between a first rotation speed (for smaller loads) and a second rotation speed (for larger loads), optimizing both productivity and accuracy for different operating conditions without manual intervention.
Solution Approach 2:
The system changes the operational parameter (rotation speed) of the dispersion table based on the mass value of articles detected by the acquisition unit. By adjusting the rotation speed parameter according to the load condition, the system maintains accurate distribution while handling varying quantities of articles efficiently.
2Reliability
If the rotation speed of the dispersion table is set to a constant high speed to prevent article adhesion, then article adhesion is suppressed, but the supply amount to each hopper becomes excessive when total mass is large
Solution Approach 1:
Instead of using a constant high rotation speed, the system dynamically adjusts the rotation speed based on the actual load condition. The acquisition unit detects the total weight, and the control unit selects the appropriate rotation speed to prevent adhesion only when necessary, while avoiding excessive supply when the load is large.
Solution Approach 2:
The system uses feedback from the acquisition unit that continuously monitors the total weight of articles on the dispersion table. Based on this feedback, the control unit adjusts the rotation speed in real-time, preventing article adhesion when the load is small while reducing speed when the load is large to maintain accurate hopper input.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves the accuracy of article distribution to each hopper by adjusting the rotation speed according to the supply amount, preventing excessive supply and enhancing overall combination accuracy.
Implementation Method 1
a dispersion table configured to rotate an article supplied from an outside around a central axis defined in a substantially vertical direction and to convey the article in a direction away from the central axis
Data Source
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AI summary
A weighing apparatus according to the present invention comprises: a dispersion table 10 configured to rotate an article 100 supplied from an outside around a central axis C defined in a substantially vertical direction and to convey the article 100 in a direction away from the central axis C; an acquisition unit 2 configured to acquire a mass value of the article 100 placed on the dispersion table 10; and a control unit 3 configured to control a rotation speed of the dispersion table 10 on the basis of the mass value. The control unit 3 is configured to set the rotation speed of the dispersion table 10 to a first rotation speed when the mass value is equal to or less than a first mass value, and to set the rotation speed of the dispersion table 10 to a second rotation speed slower than the first rotation speed when the mass value is a second mass value heavier than the first mass value.