Drum Dosing Device Vacuum Control for Mass Precision
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Solution Overview
Problem
Drum dosing devices often fail to produce dosing quantities of powdered products within a specific mass tolerance range due to variations in powder density and filter clogging, leading to inconsistent dosing.
Innovation Solution
A method that uses a drum dosing device with a measuring device to determine the mass of ejected dosing quantities, forming a mass mean value and adjusting the partial vacuum level to maintain dosing within a predetermined range, thereby compensating for long-term changes in powder density and filter clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If volumetric dosing via drum dosing device is used, then dosing speed and productivity are improved, but dosing mass precision deteriorates
Solution Approach 1:
The patent implements a feedback control system where a measuring device determines the actual mass of each dosing quantity, and this information is used to adjust the partial vacuum level for subsequent dosing operations. This closed-loop feedback mechanism allows the system to maintain high productivity while improving dosing mass precision by continuously correcting deviations from the target mass.
Solution Approach 2:
The patent changes the operating parameter (partial vacuum level) dynamically based on measured dosing masses. By adjusting the vacuum level in response to measured deviations, the system optimizes the balance between dosing speed and mass precision, resolving the contradiction between maintaining high productivity and achieving accurate dosing.
2Object-affected harmful factors
If filter element is used to apply partial vacuum, then powder containment is improved, but dosing consistency deteriorates due to filter clogging
Solution Approach 1:
The feedback control system detects changes in dosing mass caused by filter clogging and compensates by adjusting the partial vacuum level. This allows the system to maintain consistent dosing despite the deteriorating filter condition, while still containing powder effectively through the filter element.
Solution Approach 2:
The system dynamically adjusts the partial vacuum level in response to filter clogging. Rather than using a static vacuum setting, the system adapts the vacuum parameter in real-time to compensate for filter element degradation, maintaining dosing consistency throughout operation.
3Manufacturing precision
If mass measurement and tendency regulation is implemented, then dosing precision is improved, but device complexity increases
Solution Approach 1:
The patent implements a relatively simple feedback control system that measures dosing mass and adjusts vacuum level accordingly. The feedback mechanism uses straightforward comparison of measured mass to target mass, with simple adjustment rules, avoiding overly complex control algorithms while still achieving improved dosing precision.
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 method ensures consistent dosing masses by adjusting the partial vacuum level based on mass mean values, maintaining dosing within the target range and reducing the need for operator intervention, enhancing efficiency and preventing incorrectly dosed products.
Implementation Method 1
a partial vacuum can be applied thereto through the filter element. Under the effect of the partial vacuum, powder is suctioned into the dosing openings
Implementation Method 2
a measuring device for the mass determination of the dosing quantities
Data Source
AI summary
A method is for producing individual dosing quantities of a powdered product via a drum dosing device. Individual masses of multiple ejected dosing quantities are sequentially determined. A mass mean value is formed and compared to a predetermined inner target mass range. If the mass mean value is inside the range, the level of the partial vacuum acting on the dosing opening in the filling position remains unchanged, and the above formation of a mass mean value begins anew. If the mass mean value is outside the range, an adapted partial vacuum is ascertained such that in the case of excessively low mass mean value, the level of the partial vacuum is increased, and in the case of excessively high mass mean value, the level of the partial vacuum is decreased. The adapted partial vacuum is applied to the dosing opening in the filling position.