Filter Apparatus Scraper Blade Topology Control
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Solution Overview
Problem
Existing filter apparatuses, particularly rotary vacuum drum and disc filters, face challenges in continuous cake discharge and yield optimization due to manual adjustment of scraper blades, which requires stopping the operation and risks damage to brittle ceramic filter surfaces.
Innovation Solution
A filter apparatus with an angular position sensor and actuator system that continuously adjusts the scraper blade's distance from the filter surface based on measured topology, allowing for automatic and precise scraping without stopping the operation, and using lasers to calculate cake volume and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual adjustment of scraper blade is used, then the scraper blade can be positioned close to the filter surface for maximum cake scraping, but the operation must be stopped and there is risk of damage to the brittle ceramic filter surface
Solution Approach 1:
The patent replaces the manual mechanical adjustment system with an automated optical measurement and actuation system. Lasers measure the filter surface topology and an actuator automatically adjusts the scraper blade position based on the measured data, eliminating the need for manual intervention and reducing the risk of damage to the ceramic filter surface.
Solution Approach 2:
The system enables the filter apparatus to automatically monitor and adjust its own operation parameters. The laser measurement system continuously tracks the filter surface topology and the control system autonomously positions the scraper blade, allowing the system to serve itself without external intervention.
2Productivity
If the scraper blade is positioned very close to the filter surface, then cake scraping efficiency is maximized, but the risk of contact and damage to the filter surface increases
Solution Approach 1:
The patent implements a feedback control system where lasers continuously measure the filter surface topology and this information is fed back to the control system, which adjusts the scraper blade position in real-time. This closed-loop feedback ensures the blade remains optimally close to the surface without contacting it, maximizing scraping efficiency while minimizing damage risk.
Solution Approach 2:
The system performs preliminary measurement of the filter surface topology using lasers before the scraping operation begins. This advance knowledge of the surface geometry allows the scraper blade to be pre-positioned at the optimal distance, preventing contact while maximizing scraping efficiency from the start of operation.
3Ease of operation
If manual adjustment of scraper blade is used, then simple device structure is maintained, but operation interruptions and maintenance requirements increase
Solution Approach 1:
The patent substitutes simple manual mechanical adjustment with an automated system combining optical sensors (lasers), measurement electronics, and an actuator. While this increases device complexity, it eliminates operation interruptions and enables continuous production, providing a net benefit in terms of overall operational ease.
Solution Approach 2:
The automated system performs self-adjustment without requiring operator intervention. The laser measurement system and actuator work together to automatically maintain optimal scraper blade positioning, freeing operators from repetitive adjustment tasks and enabling uninterrupted continuous operation.
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
This solution enables continuous operation with increased productivity, maximized cake scraping, and minimized risk of scraper blade contact with the filter surface, resulting in higher yield and reduced maintenance interruptions.
Implementation Method 1
The topology of the filter surface is measured with at least one laser
Implementation Method 2
Vacuum filtration is based on producing a suction within the filtrate channels and thereby forming a cake of mineral on the surface of the filter medium
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The apparatus comprises a cylindrical drum (20) that is supported on a rotatable shaft (21) having a centre axis (X-X), a number of filter plates (25) being attached to the drum (20), said filter plates (25) forming a filter surface (20A) on the drum (20), a scraper blade (31) for scraping a cake (60) from the filter surface (20A), an angular position sensor (70) for measuring the angular (φ) position of the drum (20). The filter apparatus (10) comprises further an actuator (30) for continuously adjusting the distance (D1) of a tip of the scraper blade (31) from the filter surface (20A) based on the predetermined topology of the filter surface (20A) at each angular (φ) position of the drum (20).