Powder Dosing Device with Endless Screw for Precision Dispensing
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Solution Overview
Problem
Existing powder dosing devices in the chemical and pharmaceutical industry lack precision for weighing small quantities of powders, often leading to contamination risks and product degradation, with most devices unable to achieve the required precision of 1 to 2 mg with accuracy of 0.1 to 0.2 mg.
Innovation Solution
A dosing device with a cap featuring an endless screw and a dispensing opening on the second end face, allowing for precise control and dispensing of small powder masses by positioning the opening in communication with the endless screw, enabling precise dosing of less than 5 mg, particularly less than 3 mg, with accuracy below 1 mg, and incorporating features like vibration or tapping to improve powder flow and an agitator to prevent stacking effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional powder dispensing devices are used, then ease of operation is maintained, but measurement precision deteriorates (unable to achieve 0.1 to 0.2 mg accuracy)
Solution Approach 1:
The device segments the powder flow path into distinct zones: a feed hopper for powder accumulation, an endless screw for controlled transport, and a dispensing opening for precise release. This segmentation allows each component to be optimized for its specific function, achieving high precision dosing while maintaining operational simplicity.
Solution Approach 2:
The endless screw acts as an intermediary mechanism between the feed hopper and the dispensing opening. It provides controlled, incremental powder transport, enabling precise dosing of 0.1 to 0.2 mg while maintaining ease of operation through automated mechanical control.
2Productivity
If manual weighing operations are performed, then device complexity is low, but productivity deteriorates (tedious successive weighing operations)
Solution Approach 1:
The device performs self-service through automated operation. The endless screw automatically transports and dispenses powder without requiring manual intervention for each weighing operation. This enables high-speed automated dosing of multiple powder types while maintaining simplicity through self-contained mechanical automation.
Solution Approach 2:
The device enables continuous powder dispensing operations through the rotating endless screw, which continuously transports powder from the feed hopper to the dispensing opening. This continuous action eliminates the tedious sequential manual weighing process, significantly improving productivity while keeping the automation system relatively simple.
3Reliability
If powder is exposed to environment during dispensing, then ease of operation is maintained, but object-affected harmful factors increase (contamination and degradation)
Solution Approach 1:
The device employs a closed feed hopper and capped dispensing mechanism that creates a protective barrier between the powder and the environment. This enclosed structure prevents contamination while maintaining ease of operation through simple opening and closing actions, without requiring complex protective systems.
Solution Approach 2:
The device extracts and isolates the powder from the external environment by containing it within the feed hopper and dispensing mechanism. This isolation protects the powder from contamination and degradation while allowing controlled dispensing, maintaining operational simplicity through a self-contained design.
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
The device achieves high precision in dosing small powder masses, reduces contamination risks, and minimizes product degradation by allowing precise control over powder dispensing, saving time and improving powder preservation, with the ability to automate weighing operations and adapt to various powder types and sizes.
Implementation Method 1
The feed hopper supplies an endless screw. By rotating the endless screw, it is possible to dispense controlled quantities of powder through the opening.
Implementation Method 2
incorporating features like vibration or tapping to improve powder flow and an agitator to prevent stacking effects
Data Source
AI summary
A power measure-dispensing cap including a body having a first end face, which is designed to be brought into contact with a powder container, and a second end face which, together with the first end face, defines at least one feed opening which flares out towards the first end face, the feed opening supplying at least one endless screw; and at least one opening. The opening is disposed in the second end face in contact with the endless screw.