Compartmentalized Hopper for Uniform Granular Layer Deposition
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Solution Overview
Problem
Existing additive manufacturing methods face challenges in achieving uniform layer thickness and efficient material deposition, particularly for large surfaces, and require laborious cleaning when switching between different materials, leading to increased machine complexity and cost.
Innovation Solution
A hopper design with aligned discharge orifices, a conical lower part, and compartmentalized walls ensures uniform material distribution and easy material change without residue, using geometric characteristics to maintain a constant flow rate and reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single hopper with a notched cylinder is used to control material flow, then the quantity of material deposited can be controlled, but the machine complexity increases and material change requires complete cleaning
Solution Approach 1:
The hopper is divided into multiple independent compartments, each with its own discharge orifice. This segmentation allows each compartment to be independently filled and emptied, enabling material deposition without requiring complete cleaning of the hopper when changing materials. The compartmentalization resolves the contradiction by simplifying material change operations while maintaining controlled material flow.
Solution Approach 2:
Each compartment is designed with specific geometric characteristics (conical lower part, inclined walls at specific angles) optimized for its discharge function. The compartment walls are inclined at angles between 15-45 degrees to ensure proper material flow. This local optimization allows each compartment to function independently with controlled material flow while the overall structure remains simple.
2Manufacturing precision
If a scraper is used to distribute material uniformly, then layer uniformity can be achieved, but excess material must be deposited and recovered, complicating the machine
Solution Approach 1:
The compartmentalized hopper design allows the system to self-regulate material deposition. Each compartment empties independently through its discharge orifice, and the compartment walls are designed to facilitate complete emptying without requiring external recovery mechanisms. The scraper remains simple in function, only needing to distribute material rather than recover excess, thus reducing machine complexity while maintaining layer uniformity.
3Ease of operation
If the hopper is designed for complete emptying, then material change becomes easier, but the discharge geometry becomes more complex
Solution Approach 1:
The hopper compartments are pre-filled with material before the deposition process begins. The conical lower part and inclined walls are designed in advance to ensure complete emptying during the deposition cycle. This preliminary configuration allows material change to occur simply by refilling compartments without requiring complex discharge mechanisms or geometry changes during operation.
Solution Approach 2:
The wall inclination angles are optimized within a specific range (15-45 degrees) to balance complete emptying capability with structural simplicity. By controlling this geometric parameter, the system achieves easy material change without requiring overly complex discharge geometry. The conical shape and angle parameters are selected to facilitate flow while maintaining a simple overall structure.
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 uniform layer deposition with reduced machine complexity and cost, allowing seamless transitions between materials without cleaning, suitable for various additive manufacturing processes.
Implementation Method 1
a conical lower discharge part, the lower part comprising two transverse walls inclined towards the discharge orifices
Implementation Method 2
the interior of the hopper comprises a coating whose coefficient of friction with the deposited granular material is less than 0.1
Implementation Method 3
the hopper comprises a vibration device installed on an exterior wall
Implementation Method 4
a scraper; means for moving the discharge hopper and the scraper relative to the depositing surface
Data Source
Figure 1~2
Figure 3A~4
Figure 5A~7
AI summary
A device for depositing a layer of granular material on a deposition surface, which device comprises: • - a discharge hopper; • - a scraper; • - means for moving the discharge hopper and the scraper relative to the deposition surface; characterised in that the hopper comprises: • - a plurality of discharge holes (331...335), aligned in a transverse direction (y); • - a top portion (310) and a conical bottom discharge portion (320), the bottom portion (320) comprising two transverse walls (321, 322) that are inclined towards the discharge holes; • - a transverse compartmentalisation of the discharge portion, each compartment comprising two walls (341, 342, 343) perpendicular to the transverse walls of the conical discharge portion and inclined towards the discharge hole, so as to form, facing each discharge hole, a pyramid-shaped conduit in the bottom discharge portion, the consecutive walls (342, 343) of two compartments being joined at a corner where they meet in the bottom discharge portion.