Self-Cleaning Dosing Apparatus for Masterbatch Color Change
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Solution Overview
Problem
Existing dosing systems for adding masterbatch to plastic production machines require significant time to empty and clean the material hopper when switching between different colors, leading to inefficiencies and downtime.
Innovation Solution
A self-cleaning dosing apparatus with a material hopper, feed screw, cylindrical insert, motor, slide gate, pneumatic piston, air nozzle, and Venturi pump that reverses the feed screw rotation and uses air streams to completely remove all traces of material from the system, allowing for quick and automated cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional dosing systems are used for adding masterbatch to plastic production machines, then dosing accuracy can be maintained, but significant time is required to empty and clean the material hopper when switching between different colors
Solution Approach 1:
The system performs self-cleaning automatically through a reversible feed screw that back-transports residual material and a Venturi pump that creates negative pressure to extract material from the hopper and feed screw, eliminating the need for manual cleaning intervention
Solution Approach 2:
A Venturi pump uses pneumatic principles to create negative pressure that pulls residual material from the hopper and feed screw through a collection tube, enabling automated removal of material traces without mechanical disassembly
2Productivity
If manual cleaning procedures are used to remove material traces from the dosing apparatus, then complete cleaning can be achieved, but operational downtime increases significantly
Solution Approach 1:
The reversible feed screw performs preliminary action by back-transporting residual material from the feed screw and hopper before the Venturi pump completes the cleaning process, ensuring thorough removal of material traces
Solution Approach 2:
The system automatically cleans itself through the combination of reversible feed screw back-transport and Venturi pump extraction, eliminating manual cleaning operations and reducing downtime
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 rapid and thorough removal of all material traces from the dosing apparatus, reducing downtime and facilitating seamless transitions between different masterbatch colors, improving operational efficiency in injection molding, extrusion, and extrusion blow molding processes.
Implementation Method 1
A Venturi pump creates negative pressure that pulls residual material from the hopper and feed screw
Implementation Method 2
A reversible feed screw back-transports residual material
Data Source
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AI summary
A self-cleaning dosing apparatus includes a material hopper for containing pellets of material, a feed screw, a first material outlet through which pellets of material fall by gravity onto a first end of the feed screw for the feeding of pellets to a process machine. A second material outlet is located beneath the first end of the feed screw, with a slide gate blocking the second material outlet. A pneumatic piston is provided for pulling the slide gate to unblock the second material outlet, and a Venturi pump is located under the second material outlet for pulling pellets through the second material outlet when the slide gate is opened.