Twin Screw Extruder Mixing Adjuster for Easy Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing intermeshing type twin screw extruders face challenges in achieving a sufficient drawing effect and easy screw extraction due to limitations in mixing degree adjusting devices, such as interference during screw extraction and inadequate fine-adjustment capabilities.
Innovation Solution
The implementation of a mixing degree adjusting device with spacer bars and gate plates that can be rotated and moved to adjust the flow route, allowing for easy screw extraction and sufficient drawing effect by minimizing interference and maintaining a stable flow route configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the curvature of the half arc surface of the slot bars is made smaller than the curvature of the inner peripheral surface of the barrel to obtain the sufficient drawing effect, then the drawing effect is improved, but it becomes not easy to extract the slot bars at the time of maintenance
Solution Approach 1:
The slot bars are designed to be movable rather than fixed, allowing them to be extracted and repositioned. The grooves in the barrel provide guided movement paths, enabling the slot bars to be dynamically adjusted or removed for maintenance while maintaining the desired curvature for drawing effect during operation.
Solution Approach 2:
The mixing degree adjusting device is segmented into multiple independent slot bars that can be individually extracted and repositioned. This segmentation allows maintenance personnel to remove specific slot bars without disassembling the entire device, facilitating easier maintenance while maintaining the overall drawing effect configuration.
2Productivity
If the large outer diameter portion or a flight of the screws and the small inner diameter portion of the barrel interfere with each other in the taper ring method, then the mixing degree adjusting device can control flow rate, but the screws cannot be extracted forward without moving the barrel
Solution Approach 1:
The mixing degree adjusting device is divided into separate slot bar components that can be independently removed from the barrel. This segmentation allows the screws to be extracted without requiring the barrel to move, as the adjusting device components are separated into removable segments.
Solution Approach 2:
The slot bars are designed to be extractable from the barrel through dedicated extraction grooves. This extraction capability allows the mixing degree adjusting device to be removed separately from both the barrel and screws, enabling screw maintenance without barrel movement while preserving flow rate control functionality when the slot bars are reinstalled.
3Shape
If the cutouts of the gate plates have the curvature that is substantially equal to the inner periphery of the barrel, then the gate plates can be positioned, but the adjusting range of the mixing degree is narrowed and it is not possible to obtain the sufficient drawing effect
Solution Approach 1:
The slot bars are designed to be movable within grooves, allowing dynamic adjustment of their positions to optimize both the drawing effect and mixing degree adjusting range. This dynamic positioning capability enables the system to achieve sufficient drawing effect while maintaining a wide adjusting range, unlike fixed gate plates with constrained curvature options.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A mixing degree adjusting device comprises a pair of spacer members arranged at a position sandwiching both round sectional portions of a pair of screws from both sides in the aligning direction of the pair of screws, and a pair of drawing members arranged as a position sandwiching both the round sectional portions from both sides in the orthogonal direction that is orthogonal to the aligning direction. The spacer members are movable between an adjusting position opposing to the round sectional portions, and a retracting position, when the screws are extracted from the barrel, for retracting to the outside until the passage of the screws is accepted. Opposing portions opposing to the round sectional portions at the time of moving to the adjusting position are formed in a substantially linear shape extending in parallel with the orthogonal direction seen from the axial direction of the screws. The drawing members are movable in the direction approaching to and retracting from the round sectional portions along the opposing portions in an area intervening between the opposing portions of both the spacer members at the time of moving to the adjusting position, and when the screws are extracted from the barrel, retractable to the outside until the passage of the screws is accepted.