Dynamic Stripper Pressure Control for Plastic Melt Filtration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing melt filter devices for separating impurities from plastic melts face issues with stripper effectiveness due to pressure fluctuations, leading to potential lifting and increased friction, resulting in reduced performance and wear.
Innovation Solution
A device with a pressure sensor and actuator system that automatically adjusts the contact pressure of the stripper based on material pressure, using hydraulic or electronic transducers to maintain optimal contact without external intervention, allowing for radial discharge of residues and separate control of filtering and conveying speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact pressure of the stripper is increased to prevent lifting, then the reliability of residue removal is improved, but the friction and wear between the stripper and filter body increase
Solution Approach 1:
The stripper contact pressure is made dynamically adjustable through a control system that modifies the contact pressure according to actual operating conditions. The device includes a control device for automatically modifying the contact pressure of the stripper to the actual conditions without intervention from the outside, allowing the system to adapt pressure levels to prevent stripper lifting while minimizing friction and wear.
Solution Approach 2:
A sensor detects the actual conditions (such as material pressure or stripper position) and feeds this information back to the control device, which automatically adjusts the stripper contact pressure accordingly. This feedback mechanism ensures the stripper maintains optimal contact pressure to prevent lifting while avoiding excessive pressure that would cause increased friction and wear.
2Object-generated harmful factors
If the contact pressure of the stripper is decreased to reduce friction, then the wear is reduced, but the stripper can be lifted by material pressure and lose effectiveness
Solution Approach 1:
The stripper contact pressure is made dynamically adjustable through a control system that modifies the contact pressure according to actual operating conditions. The device includes a control device for automatically modifying the contact pressure of the stripper to the actual conditions without intervention from the outside, allowing the system to adapt pressure levels to prevent stripper lifting while minimizing friction and wear.
Solution Approach 2:
A sensor detects the actual conditions (such as material pressure or stripper position) and feeds this information back to the control device, which automatically adjusts the stripper contact pressure accordingly. This feedback mechanism ensures the stripper maintains optimal contact pressure to prevent lifting while avoiding excessive pressure that would cause increased friction and wear.
3Ease of operation
If axial pushing of residue is used to discharge it, then the discharge function is achieved, but the wear increases and device stability decreases
Solution Approach 1:
The residue discharge mechanism is changed from axial pushing to radial lifting. The stripper is configured to lift residue from the filter surface in the radial direction, transporting it away on the quickest path from the filter surface. This dimensional change in the discharge direction eliminates the need for axial pushing, thereby reducing abrasive loads on the filter while maintaining effective residue removal.
Data Source
AI summary
The invention relates to a device which is used to continuously filter material mixtures, in particular for separating impurities from plastic melts. The device includes a hollow cylindrically-shaped filter element (2) which is arranged inside a housing (1), an annular chamber (22) which is defined from the outside of the filter element (2) and an inner wall of the housing, and at least one stripper (23) which can be pressed onto the filter body by an adjusting device. The stripper is used to remove the impurities detained on the filter element (2) due to a relative movement of the filter element (2) and the stripper (23). The adjusting device contains a pressure sensor (42, 53) which is used to detect the pressure of the material mixture upstream from the filter body and an actuator (43) which is connected to the pressure sensor, the actuator being used to adjust the pressure of the stripper (23) according to the pressure detected by the pressure sensor.