Powder Unloading Device Shearing Unit Pneumatic Flow
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Solution Overview
Problem
Unloading powders with high angles of repose from bulk containers often results in blocked pneumatic delivery systems, making it difficult to maintain a steady flow rate and leading to inefficiencies in the unloading process.
Innovation Solution
A device comprising a collection unit for tight fluid communication with the inner liner, a shearing unit that imparts mechanical shear energy to the powder, and a delivering unit for pneumatic unloading, which includes an air lock and secondary valve to maintain free-flowing properties, allowing for effective unloading of powders with high angles of repose and agglomerating properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pneumatic delivery system is used to unload powders from bulk containers with inner liners, then solids are contained and protected from environmental contaminants, but powders with high angle of repose cause blocking in the pneumatic tubing
Solution Approach 1:
The device performs preliminary actions on the powder before pneumatic delivery by aerating the powder in the collection unit to reduce its angle of repose, and by shearing the powder in the shearing unit to break agglomerates. These preliminary treatments ensure the powder is properly prepared for stable pneumatic flow, preventing blocking while maintaining contamination protection.
Solution Approach 2:
The collection unit and shearing unit act as intermediary components between the inner liner and the pneumatic delivery system. These intermediaries prepare the powder (aeration and shearing) before it enters the pneumatic tubing, resolving the contradiction by ensuring flow stability without compromising the sealed containment system.
2Ease of operation
If aeration is applied to reduce powder angle of repose, then powder flows more easily in discharge opening, but it is insufficient for powders with very high angle of repose
Solution Approach 1:
The device merges two treatment methods: aeration (from prior art) and mechanical shearing (new contribution). The aeration unit reduces the angle of repose while the shearing unit breaks agglomerates. This combination provides comprehensive treatment that addresses both aspects of flowability, ensuring reliable steady-state flow for powders with very high angles of repose.
Solution Approach 2:
The device applies multiple parameter changes to the powder: aeration changes the physical state and angle of repose, while shearing changes the particle size distribution and breaks agglomerates. These cumulative parameter changes transform the powder properties sufficiently to achieve steady flow even for difficult-to-flow powders.
3Productivity
If coupling device is opened to clear blocks, then flow is restored, but the advantages of closed system are reduced
Solution Approach 1:
The device performs preliminary shearing treatment to break potential agglomerates before they can cause blocking in the pneumatic tubing. By addressing the root cause of blocking upstream in the shearing unit, the system maintains continuous operation without needing to open the coupling device, thus preserving both productivity and contamination protection.
Solution Approach 2:
The device converts the potential harm of agglomerates causing blocks into a benefit by using the shearing unit to deliberately break down agglomerates in a controlled manner. This transforms the problematic agglomerating tendency into an opportunity for thorough particle size control and flow optimization, preventing blocks before they occur.
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 ensures a steady flow rate and efficient unloading of powders with angles of repose greater than 35°, even those that agglomerate, by imparting mechanical shear energy and maintaining free-flowing properties through pneumatic delivery, enhancing the unloading process and preventing contamination.
Implementation Method 1
a shearing unit, in fluid communication with the collection unit, comprising shearing means for shearing the powder
Implementation Method 2
a separate delivering unit, in down stream fluid communication with the shearing unit, the delivering unit comprising an output for pneumatic unloading means
Data Source
AI summary
Device for unloading a powder from standardized bulk containers equipped with an inner liner, the device comprising a collection unit suitable for being tightly fixed on the container and suitable for being in fluid communication with the interior of the liner; a shearing unit, in fluid communication with the collection unit, comprising shearing means for shearing the powder; and a separate delivering unit, in down stream fluid communication with the shearing unit, the delivering unit comprising an output suitable for connecting pneumatic unloading means.