Screw Press Discharge Sensor for Dielectric Filtrate Measurement

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Solution Overview

Problem

Existing methods for measuring filtrate content in screw presses are time-consuming and inaccurate, leading to delayed adjustments in chemical dosing and potential fluctuations that affect subsequent processes.

Innovation Solution

A sensor arrangement is positioned in the discharge area of the screw press, measuring the dielectric constant of the feed material to determine filtrate content, with a guide and compensation mechanism to maintain constant pressure on the sensor, using magnetic springs for precise measurement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If manual sampling and discrete time interval measurement are used, then device complexity is reduced, but measurement precision and timeliness deteriorate

Engineering Contradiction:

Improvefiltrate content measurement precisionVSAvoidsensor arrangement complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces manual sampling and mechanical measurement methods with a dielectric sensor system that continuously measures filtrate content through dielectric constant detection. This substitution enables automated, real-time measurements with high precision while eliminating the need for manual intervention and discrete time interval sampling.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The sensor arrangement enables continuous measurement of filtrate content during screw press operation, rather than relying on discrete time interval sampling. The sensor continuously monitors the dielectric constant of the material, providing uninterrupted data for real-time control and optimization of the dewatering process.

Inventive Principle:

Principle #20Continuity of useful action

2Loss of time

If measurement is performed in the dewatering area under varying pressure, then measurement timeliness is improved, but measurement precision deteriorates due to pressure effects on dielectric constant

Engineering Contradiction:

Improvemeasurement delayVSAvoidfiltrate content measurement precision

Core Design Contradiction:

Loss of timeVSMeasurement precision

Solution Approach 1:

The patent performs preliminary dewatering in the dewatering area to reduce filtrate content, then completes the measurement process in the discharge area where pressure is reduced. This preliminary action allows the material to be partially processed before measurement, enabling accurate dielectric constant measurement without the interference of high pressure while maintaining continuous monitoring capability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent employs a dynamic sensor arrangement that can adapt to varying pressure conditions. The sensor system is designed to operate in the discharge area where pressure conditions are more favorable for accurate dielectric measurement, while the overall system dynamically responds to changing material properties during the dewatering process.

Inventive Principle:

Principle #15Dynamics

3Productivity

If screw press parameters are adjusted based on delayed sampling information, then device complexity is reduced, but productivity deteriorates due to suboptimal operation

Engineering Contradiction:

Improvescrew press operating efficiencyVSAvoidautomatic control system complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements a feedback control system where the dielectric sensor continuously monitors filtrate content and this information is fed back to automatically adjust screw press parameters. The feedback loop enables real-time optimization of dewatering efficiency, chemical dosing, and press operation, eliminating the delays associated with manual sampling and analysis.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The screw press system performs self-adjustment based on dielectric sensor measurements, automatically optimizing its own operation without external intervention. The system self-regulates parameters such as screw speed, press force, and chemical dosing based on real-time filtrate content measurements, enabling continuous optimal performance.

Inventive Principle:

Principle #25Self-service

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

Enables continuous, accurate, and timely measurement of filtrate content, allowing for automatic adjustment of screw press parameters to maintain optimal operating conditions.

Implementation Method 1

measuring the dielectric constant of the feed material to determine filtrate content

Methodology Applied

Scientific EffectDielectric constant measurement: Dielectric Permittivity

Implementation Method 2

using magnetic springs for precise measurement

Methodology Applied

Scientific EffectMagnetic spring force: Magnetism

Data Source

PatentUS12365159B2Method and device for measuring the filtrate content on a screw press

Publication Date: 2025.07.22 ANDRITZ AG

AI summary

The invention relates to a screw press for separating filtrate from a feed material. It is characterised in that a sensor arrangement comprising a sensor for measuring the filtrate content is arranged in the discharge area, the feed material flowing towards and/or around the sensor. This allows simple, prompt, and accurate measurement of the filtrate content.