Filter Press Non-Contact Sensor Load Monitoring
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Solution Overview
Problem
Filter presses for solid-liquid separation require extensive operator experience to coordinate process parameters, leading to potential excessive loads on filter elements and reduced service life, necessitating a solution for optimal parameter adjustment and load monitoring.
Innovation Solution
Incorporation of non-contact sensors in the bending zone of the press wall to monitor pressure loads, connected to evaluation and control devices for real-time adjustment of feed quantity, stock density, and inlet pressure, enabling automated control and optimized filter cake formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If operator experience is used to coordinate process parameters, then filter press operation can be maintained, but excessive loads on filter elements occur and service life is reduced
Solution Approach 1:
The patent replaces manual operator judgment and mechanical load estimation with electronic sensors that directly measure the load on filter elements. Load cells or strain gauges provide real-time electrical signals representing mechanical loads, which are then processed by control systems to automatically adjust operating parameters, eliminating reliance on operator experience while preventing excessive loads
Solution Approach 2:
The patent implements a closed-loop feedback system where sensors continuously monitor filter element loads and feed this information back to the control system. The control system automatically adjusts process parameters based on this feedback to maintain loads within safe limits, thereby extending filter element service life without requiring operator intervention
2Productivity
If pressuring force is increased to improve filtration capacity, then filter cake formation improves, but excessive loads damage filter elements
Solution Approach 1:
The patent employs dynamic adjustment of pressing forces based on real-time load measurements. Rather than applying constant high pressure, the system continuously monitors filter element loads and dynamically adjusts the pressing force to optimize filtration capacity while preventing damage, allowing the pressuring force to vary within safe operational limits
Solution Approach 2:
The patent changes operational parameters (pressing force, feed rate, cycle timing) based on real-time load data from sensors. By dynamically adjusting these parameters, the system maximizes filtration capacity during safe load periods while preventing damage when load limits are approached, effectively decoupling productivity from excessive loading
3Extent of automation
If non-contact sensors are installed in bending zone to monitor press wall load, then automated control is enabled, but device complexity increases
Solution Approach 1:
The patent introduces non-contact sensors positioned in the bending zone of the press wall as intermediaries between the mechanical loading and the control system. These sensors detect structural deformations or vibrations caused by filter element loads and convert them into electrical signals, enabling automated control without direct mechanical contact or complex installation
Solution Approach 2:
The patent replaces complex mechanical load measurement systems with non-contact sensing technology. Instead of using mechanical linkages, gears, or direct contact sensors that would add significant complexity, the system uses optical, capacitive, or vibrational sensors that detect load conditions remotely, simplifying the overall device architecture while enabling automation
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 setup reduces filter cycle times, enhances filter element capacity, and allows for a constructively optimized design with reduced membrane thickness, enabling increased filter element count and improved process automation.
Implementation Method 1
Optical sensors with possibly scaling come into consideration as non-contact sensors
Implementation Method 2
Furthermore, the sensor can be an inductive sensor or a capacitive sensor
Implementation Method 3
Furthermore, the sensor can be an inductive sensor or a capacitive sensor
Data Source
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AI summary
The invention relates to a filter press for the solid-liquid separation of suspensions, comprising several plate-shaped filter elements connected in series and clamped together at their edges. These elements are pressed against a counter-support plate by means of a pressure plate. Each plate-shaped filter element comprises a press wall, a plate frame, and a filter medium on its end faces, such as a filter cloth or a membrane. The filter press also has a suspension inlet, preferably arranged centrally, and one or more filtrate outlets. In the inventive design of the filter press, the pressure on the press wall, such as strain, deformation, or change in length, is detected at least by means of a non-contact sensor, and such a sensor is assigned to at least one filter element. The sensor signals are processed by means of an evaluation unit and, if necessary,The data is transmitted via a control device to a monitoring device. If the sensor(s) operate continuously, process parameters of the filter press can be changed, particularly the feed rate, material density, inlet pressure, and filter cake formation.