Vibrating Funnel Dosing Device for Coarse Bulk Materials
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Solution Overview
Problem
Existing dosing devices face issues with wear and tear when handling coarse bulk materials like broken raw coal or lignite, leading to material flow disruptions, lump formation, and inaccurate measurement results due to the inability to effectively handle coarse materials with sharp edges.
Innovation Solution
A dosing device equipped with a vibrating funnel and a blow-out nozzle using hot air or inert gas to prevent caking and promote smooth material flow, along with a compensator to decouple vibrations from the load cell measurement, ensuring reliable feeding and complete emptying while minimizing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional dosing device is used for coarse bulk materials, then the device structure is simple, but the device suffers from high wear and tear and material flow disruptions
Solution Approach 1:
A vibration generator is integrated into the funnel to generate vibrations that prevent coarse bulk materials from digging into each other, forming bridges, or creating lumps during feeding and emptying operations. This mechanical vibration approach maintains feeding reliability for coarse materials without requiring complex structural modifications to the dosing device.
Solution Approach 2:
A blow-out nozzle is introduced to deliver hot air or inert gas directly into the discharge area of the dosing rotor. This pneumatic assistance loosens and removes material bridges and lumps formed by coarse bulk materials, ensuring complete emptying and continuous feeding without increasing mechanical complexity of the dosing mechanism.
2Reliability
If a vibration generator is added to the funnel, then feeding reliability is improved, but the measurement result may be influenced by vibrations
Solution Approach 1:
The vibration generator is positioned and mounted in such a way that its vibrations are directed into the funnel and dosing rotor, while the load cell measuring system is isolated from these vibrations. This spatial separation and selective coupling allows the vibration generator to improve feeding reliability without transmitting harmful vibrations to the measurement system, preserving measurement precision.
3Productivity
If coarse bulk materials are conveyed without assistance, then the device structure is simple, but material flow disruptions and lump formation occur
Solution Approach 1:
The vibration generator creates continuous low-amplitude vibrations in the funnel and dosing rotor, preventing coarse bulk materials from interlocking and forming bridges during the conveying process. This ensures continuous material flow and complete emptying without requiring complex mechanical conveying aids.
Solution Approach 2:
The blow-out nozzle delivers hot air or inert gas to the discharge area, creating a pneumatic field that loosens and removes material bridges and lumps. This pneumatic assistance maintains material flow continuity for coarse bulk materials without adding complex mechanical conveying components.
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 solution enables safe, low-wear feeding and reliable material flow, reducing inaccuracies and preventing lump formation, thus enhancing the dosing device's performance with coarse materials.
Implementation Method 1
the vibration generator can be arranged in such a way that it vibrates predominantly in the horizontal direction, so that the measurement result of the load cell measuring in the vertical direction is not influenced
Implementation Method 2
The blow-out jet from one or more nozzles, which are preferably designed as flat nozzles, loosens the flow of material running through the dosing device at the discharge station, as a result of which loosening of the bulk material that may have stuck together is achieved
Data Source
AI summary
In order to increase the fitness for use of a dosing device (1) for continuously and gravimetrically dosing pourable material, particularly rough fuels, a flow of material is conveyed from a charging opening (5) to an emptying opening (7) in a housing (4) with a rotor (3), which is driven about a vertical rotation axis, while determining the instantaneous load over a measuring section, and with a force measuring device (10), which detects the instantaneous load of the flow of material guided via the rotor (3) and which is connected to the housing (4) mounted on a pivot axis (8). According to the invention, a vibrating funnel (50) with a vibration generator (52) is provided above the charging opening (5) of the rotor (3).