Cement Printer Hopper Fluidization Pipes for Bridging Prevention
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Solution Overview
Problem
Existing cement printer hoppers face issues with material flow irregularities, such as bridging and ratholing, particularly with hygroscopic materials like fine grain mortar, which are exacerbated by environmental humidity, and existing solutions like climate control and fluidization pads are costly or require structural modifications.
Innovation Solution
A frame-based fluidization system with angled pipes and openings is integrated into the hopper to introduce compressed air for uniform material flow, preventing arching and ratholing without permanent modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compressed air is introduced through fluidization pads mounted on hopper walls, then material flow uniformity is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The fluidization system is segmented into multiple pipes distributed throughout the hopper volume, each pipe containing multiple openings. This segmentation allows compressed air to be introduced at multiple locations simultaneously, achieving uniform material fluidization without requiring complex pad structures mounted on walls.
Solution Approach 2:
Compressed air is introduced through pipes and openings to fluidize the material in the hopper. The pneumatic system creates upward air flows that counteract gravity and material arching, preventing ratholing and bridging while maintaining simple hopper geometry.
2Reliability
If fluidization pads are permanently mounted on hopper walls, then material flow is improved, but hopper wall integrity and versatility are compromised
Solution Approach 1:
The fluidization system is extracted from the hopper wall structure and placed as separate, removable pipes positioned within the hopper volume. This allows the pipes to be easily installed and removed without permanently modifying the hopper walls, preserving wall integrity and enabling the hopper to be reused for different materials.
Solution Approach 2:
The fluidization pipes are designed to be dynamically positionable within the hopper, allowing adjustment of pipe locations and orientations based on material characteristics and hopper geometry. This dynamic adaptability enables the same pipe system to effectively fluidize different materials without permanent modifications.
3Reliability
If vibration is applied to the hopper to prevent arching, then material flow is improved, but structural complexity and maintenance requirements increase
Solution Approach 1:
Instead of mechanical vibration, compressed air is used to fluidize the material and prevent arching. The pneumatic approach eliminates the need for vibration motors, mounting structures, and control systems, significantly reducing device complexity while maintaining effective material 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 ensures consistent material flow in humid environments by fluidizing the material, addressing bridging and ratholing effectively while avoiding costly modifications and structural complexity.
Implementation Method 1
A fluidization system for fluidizing material within a hopper includes a frame... Each pipe is formed with at least one opening therein, the at least one opening facing into the interior of the hopper. A fluid pathway is formed from the conduit to the opening.
Data Source
AI summary
A fluidization system for fluidizing granular material within a hopper has a frame configured to be disposed against and supported by an interior of a hopper in a substantially horizontal orientation. The frame forms a gas conduit and a plurality of fluidization pipes are in fluid communication with the frame. The fluidization pipes extend from the frame at an angle relative to the frame and each fluidization pipe has at least one opening, so there is a fluid pathway being formed from the conduit to the opening.