Flexible Rigid Hopper Powder Doser for Precision Dispensing
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Solution Overview
Problem
Existing powder dosers face challenges with accuracy and speed in dispensing pharmaceutical powders due to volumetric systems' variability with powder density, durability issues with aperture closures, and inefficiencies in stirrer designs that leave unstirred powder in hoppers.
Innovation Solution
A powder doser system featuring a hopper with a flexible material upper portion and a rigid metal or metal alloy lower portion, equipped with a vibration device, a pin that reciprocates and rotates to control powder flow, and multiple stirrers to ensure thorough mixing, along with a transfer system for precise dispensing and weighing, optimized by a control system adjusting stirrer rotation, vibration, and pin motion for accuracy and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If volumetric systems are used for measuring powder, then dispensing speed is improved, but accuracy deteriorates due to powder density variations
Solution Approach 1:
The system incorporates a weighing mechanism that provides real-time feedback on powder mass during dispensing. The controller monitors the actual powder mass and adjusts dispensing parameters dynamically to achieve the target dose weight, resolving the accuracy issue while maintaining speed
Solution Approach 2:
The invention replaces traditional volumetric measurement mechanisms with a gravimetric (weight-based) measurement system. This substitution allows accurate dose control based on mass rather than volume, eliminating the problem of density variations affecting accuracy
2Measurement precision
If gravimetric systems are used for weighing powder, then accuracy is improved, but productivity deteriorates due to weighing time and flow variability
Solution Approach 1:
The system performs preliminary actions by pre-positioning the closure and preparing the dispensing mechanism before actual powder release. This reduces the time required during the critical weighing phase, allowing faster operation while maintaining gravimetric accuracy
Solution Approach 2:
The invention employs dynamic control of the closure and dispensing parameters during the weighing process. The system can adjust flow rate and timing in real-time based on feedback, optimizing the balance between speed and accuracy
3Manufacturing precision
If closures are used to control powder flow through aperture, then dosing control is improved, but reliability deteriorates due to wear and clogging
Solution Approach 1:
The invention inverts the traditional approach by making the closure the moving element that opens and closes the aperture, rather than having a stationary closure with a moving pin. This reversal reduces wear on the aperture edges and improves reliability
Solution Approach 2:
The system changes the material parameters of the closure and aperture surfaces to reduce friction and adhesion. By selecting materials with appropriate surface properties, the system minimizes powder sticking and clogging while maintaining dosing precision
4Reliability
If harder materials are used for closure and aperture, then durability is improved, but performance deteriorates due to powder adhesion and clogging
Solution Approach 1:
The invention optimizes the surface parameters of the closure and aperture by selecting materials with specific friction and adhesion characteristics. This allows the system to maintain durability while preventing powder sticking and clogging
Solution Approach 2:
The system may employ composite material structures combining hard wear-resistant layers with surface treatments or coatings that reduce powder adhesion. This composite approach simultaneously achieves durability and smooth powder flow
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 system achieves precise and consistent dispensing of pharmaceutical powders in the range of 0 to 500 mg with rapid dose times, minimizing errors and powder adhesion, while maintaining durability and scalability for various applications.
Implementation Method 1
a vibration device configured to agitate the hopper
Implementation Method 2
The vibration device may be a piezo-electric actuator
Data Source
AI summary
A powder doser for accurately dispensing powder, for example a pharmaceutical substance, into a receptacle, the powder doser comprising a hopper with a tip having an aperture through which powder may flow, a closure to close the aperture and a vibration device configured to agitate the hopper, wherein a first portion of the hopper is formed of flexible material and a second portion proximate the tip is formed of substantially rigid material.