Movable Link Mechanism for Extruder Screw Maintenance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In material processing plants with successive screw-type extruders, removing and reinserting the screw shafts of the first extruder is difficult and time-consuming due to the weight and configuration of connecting parts, particularly when the screw shaft must be pulled out through the discharge zone.
Innovation Solution
A movable link with a guided motion mechanism allows the link to transition from a connected position to an open position, enabling easy withdrawal of the screw shafts from the casing bores, facilitated by a mover that performs this guided motion, ensuring the screw shafts can be pulled out near the discharge zone without obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connecting parts are made heavy and robust to ensure structural stability, then the reliability of the connection is improved, but the ease of removing and reinserting the screw shafts deteriorates
Solution Approach 1:
The connecting part (link) is segmented into a fixed portion and a movable portion that can be independently operated. The movable portion can be displaced to open positions, allowing the screw shaft to be removed without moving the heavy fixed portion, thus resolving the contradiction between connection stability and ease of screw shaft removal.
Solution Approach 2:
The link is designed with dynamic characteristics, allowing it to transition between a connected position (providing stable connection) and open positions (enabling screw shaft removal). This dynamic capability allows the system to adapt its state based on operational requirements, resolving the contradiction between maintaining reliable connection and enabling easy maintenance.
2Strength
If the connecting parts are made heavy and robust, then the structural integrity is improved, but the time required for maintenance operations increases
Solution Approach 1:
By segmenting the link into fixed and movable portions, the heavy fixed portion maintains structural integrity while the lighter movable portion can be quickly operated for maintenance. This segmentation allows the screw shaft to be removed without moving the heavy structural components, significantly reducing maintenance time while preserving structural strength.
Solution Approach 2:
The movable portion of the link is extracted as a separate operational element that can be independently displaced. This extraction allows the maintenance operation to focus only on moving the lightweight movable portion rather than manipulating the entire heavy connecting structure, thereby reducing maintenance time while maintaining structural integrity.
3Ease of operation
If the screw shaft is pulled out through the discharge zone as customary, then the ease of screw shaft removal is improved, but this becomes problematic when the other end has motor, coupling and transmission
Solution Approach 1:
The link is segmented into fixed and movable portions, enabling the screw shaft to be removed from the first extruder while the second extruder with its motor, coupling and transmission remains stationary and connected. This segmentation allows independent access to the screw shaft without requiring disconnection or movement of the complex drive train at the second extruder.
Solution Approach 2:
The movable portion of the link acts as an intermediary element that can be displaced to provide access to the screw shaft. This intermediary mechanism allows the screw shaft to be removed without directly interfering with the motor, coupling and transmission assembly at the second extruder, simplifying the overall removal operation despite the presence of complex drive components.
Data Source
AI summary
A material processing plant comprises two screw-type extruding machines (1, 2) which are interconnected by means of a link (29). The link (29) is movable from a position of connection into an open position of release of the casing bores (12). Provision is further made for a mover (38) which acts on the link (29) for implementation of the motion.