Dosing Wiper Yielding Under Lateral Stripping Forces
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Solution Overview
Problem
Existing dosing devices for free-flowing materials face issues with damage to the scraper edge and other components due to excessive lateral forces during the stripping process, leading to inaccurate dosing and potential damage to the device.
Innovation Solution
The dosing device incorporates adjustable holding means that allow the dosing wiper to recede from its position when high stripping forces are detected, preventing damage by setting a limited holding force that yields to operational counter-forces, thus avoiding damage and ensuring precise dosing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the dosing wiper is fixed rigidly to the dosing vessel, then the dosing precision is improved, but the scraper edge and other components are damaged due to excessive lateral forces during stripping
Solution Approach 1:
The dosing wiper is made movable along the longitudinal guide instead of being rigidly fixed. The holding means provide a limited holding force that allows the wiper to retreat automatically when excessive lateral forces occur during stripping, preventing damage while maintaining dosing precision during normal operation
Solution Approach 2:
The holding means act as an intermediary mechanism between the dosing wiper and the dosing vessel. This intermediary provides a controlled connection that allows the wiper to stay positioned during normal dosing while permitting retreat under excessive load, thus mediating between the need for precision and the need for damage prevention
2Measurement precision
If the holding force on the dosing wiper is increased to prevent retreat, then the dosing accuracy is maintained, but the risk of damage to the scraper and drive devices increases due to excessive lateral forces
Solution Approach 1:
The holding force parameter is optimized to a specific range that balances dosing accuracy and damage prevention. The holding means are adjustable to provide sufficient force to maintain wiper position during normal dosing operations while remaining below the threshold that would cause damage during excessive lateral forces
3Reliability
If the dosing wiper is made movable to prevent damage, then the safety of components is improved, but the dosing precision may deteriorate due to potential position changes
Solution Approach 1:
The dosing wiper is designed to be dynamically movable only under specific conditions (excessive lateral forces). During normal dosing operations, the holding means maintain the wiper in a stable positioned state, ensuring dosing precision is not compromised while allowing movement only when necessary for protection
Data Source
Figure 1
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Figure 3
AI summary
The invention relates to a dosing device for volumetrically dosing pourable dosing material, preferably pourable sample material, comprising at least one metering unit (3) that is open towards the top and that is preferably shaped like a beaker. The opening edge (22) of said metering unit defines an opening cross-section, and at least one dosing blade (24) comprising a blade edge (25) that is associated with the opening cross-section and that is preferably parallel to said section. The metering unit and/or the dosing blade is/are displaceable in order to obtain a lateral relative blade movement between the metering unit (3) and the blade edge (25). The aim of the invention is to improve said dosing device in an advantageous manner such that a longitudinal guide (26), along which the dosing blade (24) can be guidingly displaced in a transversal manner to the opening cross-section (23), is provided and that maintaining means (34) that are suitable for producing and adjusting in a dimensionally adjustable manner the maintaining force (61) acting upon the dosing blade (24) in relation to the longitudinal guide (26). When the forces (60) that are exerted upon the dosing blade (24), after the stripping process, exceed the maintaining force, the dosing blade (24) is displaced back along the longitudinal guide (26).