Vacuum Sizing Tank with Electronic Flow Control
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Solution Overview
Problem
Current extrusion methods lack precise control over water and vacuum flows, leading to unwanted deformation of molten plastic extrudate due to unpredictable forces and temperature variations, which complicates the formation of small and thin-walled plastic products.
Innovation Solution
A vacuum sizing tank system equipped with water pumps, manifolds, valves, sensors, and controllers to manage water and vacuum flows, ensuring uniform and controlled conditions, including temperature zones, to minimize deformation and achieve precise extrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual valve adjustment is used to control water flow, then the system is simple to operate, but the manufacturing precision deteriorates due to lack of precise flow control
Solution Approach 1:
The patent replaces manual mechanical valve adjustment with an automated electronic control system that uses sensors to detect water flow rates and electronically actuates valves to maintain precise flow rates. This substitution of mechanical manual control with an electromechanical automated system resolves the contradiction by achieving high manufacturing precision through precise electronic flow control while accepting increased device complexity as the trade-off.
Solution Approach 2:
The patent implements a feedback control system where sensors continuously monitor water flow rates and provide this information to a controller that adjusts valve positions to maintain desired flow rates. This closed-loop feedback mechanism enables precise manufacturing accuracy by automatically compensating for flow variations, resolving the contradiction between precision and complexity through intelligent control.
2Manufacturing precision
If completely open valves are used to allow water flow into the tank, then the ease of operation is improved, but the manufacturing precision deteriorates due to uncontrolled flow rates and lack of uniformity
Solution Approach 1:
The patent implements a self-regulating system where sensors automatically detect flow rates and the electronic control system automatically adjusts valve positions to maintain uniform flow rates without operator intervention. This self-service automation resolves the contradiction by achieving precise flow uniformity while eliminating the need for manual valve adjustment, thereby maintaining ease of operation through automated control.
Solution Approach 2:
The patent replaces manual mechanical valve operation with an automated electronic control system that uses sensors to detect flow rates and electronically actuates valves to maintain uniform flow rates. This substitution resolves the contradiction by achieving high flow uniformity while simplifying operation through automation, removing the need for manual valve control.
3Temperature
If water flow is increased to cool the extrudate, then the cooling effectiveness is improved, but the manufacturing precision deteriorates due to unwanted forces and eddies acting on the extrudate
Solution Approach 1:
The patent implements a dynamic control system that continuously adjusts water flow rates based on real-time sensor feedback to maintain optimal cooling while minimizing harmful effects. The system dynamically balances cooling effectiveness against shape accuracy by adjusting flow rates to prevent eddies and unwanted forces, resolving the contradiction through adaptive control that responds to actual process conditions.
Solution Approach 2:
The patent changes water flow rate parameters dynamically based on process conditions, using sensor feedback to adjust flow rates to optimal levels that provide sufficient cooling while preventing harmful eddies and forces. This parameter optimization resolves the contradiction by finding the precise flow rate balance point that achieves both cooling effectiveness and shape accuracy.
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 system enables precise control of water and vacuum flows, reducing unwanted forces and achieving tighter tolerances, such as +/-0.0007" ID/OD for small diameter tubes, significantly improving the precision of extruded products compared to existing methods.
Implementation Method 1
The vacuum sizing tank may comprise an enclosed trough capable of holding water, holding a plurality of vacuum
Implementation Method 2
The water pump applies pressure to the various manifolds, which direct the water into and through the tank in a controlled fashion
Implementation Method 3
the molten plastic is easily susceptible to deformation up until it is sufficiently cooled to a solid state
Data Source
AI summary
A vacuum sizing tank configured to provide controlled fluid flow. A fluid control system and a vacuum sizing tank utilizing electronic controls to create and maintain controllable fluid flow within the tank. Flow meters may measure the flow in and out of the tank to maintain consistency. Temperature meters may measure the temperatures for each of the flows to maintain consistency. An electronic circuit may compare the values with preset values. Any difference between the values may trigger change by varying the voltage applied to a variable speed water pump.