Ceramic Powder Compacting Device Pneumatic Expansion Control
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Solution Overview
Problem
Existing compacting devices for ceramic powder layers face issues with non-uniform expansion counterpressure, leading to cracks and fissures, and high friction between steel belts and plastic sliding blocks, causing movement resistance, wear, and defects in the end product.
Innovation Solution
A compacting device with a pneumatic pusher using a gas cushion to control expansion, reducing direct contact and friction, and incorporating a hydraulic system with pressure regulation to manage expansion counterpressure, ensuring uniform pressure across the powder layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a flexible sheet supported by hydraulic jacks is used to counter expansion, then the expansion countering pressure is uniform across the powder layer, but the friction between the steel belt and plastic sliding blocks causes high movement resistance and wear
Solution Approach 1:
The patent replaces the mechanical sliding block system with a pneumatic system. Instead of using plastic sliding blocks that physically contact and friction against the steel conveyor belt, the invention introduces compressed air cushions between the pushers and the belt. This substitution eliminates direct mechanical contact and friction while maintaining the expansion countering function through pneumatic pressure.
Solution Approach 2:
The patent employs pneumatic technology by using compressed air to create cushions between the pushers and the conveyor belt. The air supply system delivers compressed air to multiple pushers, allowing them to exert expansion countering force without direct contact with the belt. This pneumatic approach resolves the friction and wear problems inherent in mechanical sliding contact systems.
2Device complexity
If sliding blocks are used to counter expansion, then the device structure is simple, but the friction causes defects on the inner surface of the belt affecting the end product
Solution Approach 1:
The patent replaces the mechanical sliding block system with a pneumatic system. Instead of using plastic sliding blocks that physically contact and friction against the steel conveyor belt, the invention introduces compressed air cushions between the pushers and the belt. This substitution eliminates direct mechanical contact and friction while maintaining the expansion countering function through pneumatic pressure.
Solution Approach 2:
The patent introduces compressed air as an intermediary substance between the pushers and the conveyor belt. This air cushion acts as a mediator that transmits the expansion countering force without requiring direct contact between solid surfaces. The intermediary air layer prevents friction, wear, and surface defects while enabling the pushers to effectively counter powder layer expansion.
3Ease of operation
If a single manifold supplies fluid to all hydraulic jacks, then the system is simple to operate, but the expansion countering effect is not uniform at lateral edges versus centre
Solution Approach 1:
The patent divides the expansion countering function into multiple independent pushers distributed across the width of the conveyor belt. Each pusher is supplied with compressed air through separate channels or manifolds, allowing independent pressure regulation. This segmentation enables different lateral regions (edges versus centre) to receive appropriately differentiated pressure, achieving uniform expansion countering effect across the entire width.
Solution Approach 2:
The patent applies the principle of local quality by enabling different regions of the conveyor belt width to have different pressure characteristics. The air supply system is configured to provide differentiated compressed air pressure to pushers at lateral edges compared to those at the centre, matching the local expansion characteristics of the powder layer in different regions and achieving overall uniform expansion countering.
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 significantly reduces friction and wear, prevents cracks and fissures, and maintains the integrity of the compacted powder layer by controlling expansion without blocking it, while minimizing belt resistance and wear.
Implementation Method 1
A compacting device with a pneumatic pusher using a gas cushion to control expansion, reducing direct contact and friction
Implementation Method 2
The European patent EP-B1-1 585 620 (SACMI) describes a solution to the above-mentioned problem of post-expansion of the material in transit in which a flexible sheet is used, supported by a row of hydraulic jacks arranged beside each other in a transverse direction with respect to the feeding direction of the conveyor belt
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A device (100) for compacting a layer (MT) of powder material; the device (100) comprises a movable surface (12), which is designed to convey the layer (MT) of powder material in a predefined feeding direction (F); a compacting belt (22) positioned over the transport surface (12); a pressing station (40, 45, 50, 55), which is designed to press the compacting belt (22) towards the transport surface (12), so as to press the layer (MT) of powder material; and an expansion countering station (80), which is designed to counter the expansion of the layer (MT) of powder material downstream of the pressing station (40, 45, 50, 55) and comprises a pusher delivering a gas under pressure to create a pushing gas cushion (STR; STR*) on the compacting belt (22).