Toggle Bearing Structure for Easier Bush Replacement in Injection Molding
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Solution Overview
Problem
Injection molding machines face maintainability issues due to bush wear over time, requiring frequent replacement and maintenance.
Innovation Solution
The injection molding machine incorporates a toggle mechanism with removable bearing portions, allowing for easier maintenance by providing a gap between main body-side and division bearing portions, enabling the connection pin to be shifted and the bush to be replaced without interference from the tie bar, thus improving maintainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bearing portion is made as a single integrated structure, then the structural strength and rigidity are improved, but the maintainability and ease of bush replacement deteriorate
Solution Approach 1:
The bearing portion is divided into a main body-side bearing portion and a division bearing portion that can be separated from each other. This segmentation allows the bush to be replaced by removing only the division bearing portion, significantly improving maintainability while the main body-side bearing portion retains the structural strength requirements.
2Reliability
If the bush is replaced after wear, then the reliability is maintained, but the loss of time for maintenance increases
Solution Approach 1:
By segmenting the bearing portion into removable division bearing portion and main body-side bearing portion, the bush replacement process is simplified to only require removal of the division bearing portion, dramatically reducing maintenance time while ensuring reliability through proper bush replacement.
Solution Approach 2:
The division bearing portion is extracted as a separate removable component that can be easily detached to access and replace the bush, eliminating the need to disassemble the entire bearing portion and reducing maintenance time.
3Stability of the object's composition
If the connection pin is constrained by the tie bar position, then the structural stability is improved, but the ease of operation for maintenance deteriorates
Solution Approach 1:
The bearing portion is segmented into removable division bearing portion, allowing the connection pin to be accessed and shifted for bush replacement without being constrained by the tie bar position, improving ease of maintenance while maintaining structural stability during operation.
Data Source
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AI summary
An injection molding machine (10) includes a toggle mechanism (150) which connects a movable platen (120) and a rear platen (130) . The toggle mechanisms (150) includes a plurality of links (151, 152, 153, 154), a first connection portion which connects the movable platen (120) and the link (152), a second connection portion which connects the links (152, 153) to each other, and a third connection portion which connects the rear platen (130) and the link (154) . At least one of the first to third connection portions includes a height position changing mechanism which changes a height position of a connection pin (50) of the connection portion.