Rotating Dosing Head Radial Slots for Microgram Dispensing
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Solution Overview
Problem
Existing dosing devices are inadequate for precisely dispensing small amounts of powdery or pasty substances into vessels with small openings, often resulting in scattering and clogging due to their design, which limits the minimum dischargeable quantity and is not suitable for strongly coagulating substances.
Innovation Solution
A dosing device with a dosing head featuring a discharge and closure element that can be rotated and translated along the central axis, creating a variable passage opening, and a feed tool that applies a downward force and loosens substances, allowing for precise control over the discharge of microgram amounts and effective handling of sticky materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an annular outlet opening is used in existing dosing devices, then the discharge opening can be closed from above, but the minimum discharge quantity is limited and several bulk material units emerge simultaneously causing scattering
Solution Approach 1:
The annular outlet opening is segmented into multiple radial slots that can be independently controlled. By selectively opening or closing individual slots, the discharge quantity is divided into smaller units, enabling precise dosing of small amounts while preventing multiple bulk material units from emerging simultaneously.
Solution Approach 2:
The outlet opening configuration is made dynamic through the ability to adjust the opening width of individual radial slots. This allows the discharge opening to be optimized for each dosing operation, enabling precise control over minimum discharge quantity while maintaining the ability to close the outlet completely when needed.
2Productivity
If the annular gap width is reduced to decrease discharge rate, then smaller amounts can be discharged, but the gap becomes prone to clogging
Solution Approach 1:
The continuous annular gap is segmented into multiple discrete radial slots. This segmentation allows individual slots to be opened or closed independently, enabling the system to maintain adequate slot widths that resist clogging while achieving precise control over total discharge rate by adjusting the number and opening width of active slots.
Solution Approach 2:
Different radial slots can have different opening widths tailored to specific dosing requirements. This local optimization ensures that each slot maintains sufficient width to prevent clogging while the collective configuration of multiple slots achieves the desired reduced discharge rate for precise dosing.
3Ease of operation
If an upwardly tapering valve body is used, then the outlet can be opened, but radial or horizontal component causes scattering beyond the container opening
Solution Approach 1:
The valve body geometry is changed from an upwardly tapering symmetric conical shape to a configuration with radial slots that discharge vertically downward. This asymmetric design eliminates the radial or horizontal flow components that cause scattering, directing all bulk material units straight down into the container opening.
Solution Approach 2:
The valve body can be adjusted vertically to dynamically control the opening of radial slots. This vertical adjustment mechanism enables outlet opening without the need for an upwardly tapering structure, and the radial slot configuration ensures that discharged material flows vertically without developing radial or horizontal velocity components that would cause scattering.
Data Source
Figure 1~2b
Figure 3a~4
Figure 5a~7b
AI summary
The invention relates to a dosing device for powdery or pasty substances which comprises a discharge and closure element (6, 106, 206, 306, 10 406, 606, 706, 806) comprising a closure area (27, 127, 227, 627, 727) and a discharge area. Said dosing device also comprises a supply tool (12, 212, 412, 612) comprising at least one supply element (15, 215, 315, 415, 615) which is used to guide the substance to an outlet (7, 607). The outlet (7, 607) and the discharge and closure element (6, 106, 206, 306, 406, 606, 706, 806) are arranged on the central longitudinal axis (4) of the dosing head (1, 101, 201, 15 301, 401, 601), and the supply tool can be rotated about the central longitudinal axis (4) in relation to the housing and the at least one supply element can be displaced about the central longitudinal axis (4) on a circular path.Said discharge and closure element can be rotated about the central longitudinal axis (4) in relation to the housing and is embodied such that it can be displaced in a translatory manner in relation to the outlet along the central longitudinal axis (4). The at least one supply element of the supply tool is inclined at a certain angle, on the plane of the circular path thereof in the direction of rotation thereof, for the discharge of substances.