Plastic Injection Feeding Bar for Synchronized Mold Bar Transfer
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Solution Overview
Problem
Current plastic injection devices have high machinery complexity and long cycle times due to the individual engagement of mold bars, limiting their efficiency in mass production of multi-component plastic parts.
Innovation Solution
A plastic injection device with a feeding bar system that allows multiple mold bars to be displaced by pushing one mold bar, reducing the need for complex actuating members and enabling synchronized movement of mold bars between stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each mold bar is individually engaged by a transfer device, then the mold bars can be moved precisely, but the machinery complexity increases and cycle time increases
Solution Approach 1:
Multiple mold bars are merged into a single feeding bar structure, allowing one actuating member to move all mold bars simultaneously. This combining approach reduces the number of individual transfer devices from multiple to one, significantly simplifying the transfer system while maintaining synchronized positioning of all mold bars.
Solution Approach 2:
The feeding bar serves multiple functions: it acts as a support structure for multiple mold bars, a transfer mechanism for moving them, and a synchronization device for coordinated movement. This multi-functional design eliminates the need for separate individual engagement devices for each mold bar.
2Adaptability or versatility
If each mold bar is individually engaged by a transfer device, then the mold bars can be moved independently, but the cycle time increases
Solution Approach 1:
The feeding bar enables continuous synchronized movement of all mold bars through a single actuating action. Instead of sequentially moving each mold bar individually (which would increase cycle time), the system performs continuous useful action by moving all mold bars simultaneously in one operation, thereby reducing cycle time while maintaining movement flexibility.
3Device complexity
If multiple mold bars are moved by a single actuating member, then the device complexity is reduced, but the mold bars must be moved simultaneously rather than independently
Solution Approach 1:
The feeding bar merges multiple mold bars into a unified structure that can be actuated by a single member. This merging maintains adaptability because the entire assembly of mold bars on the feeding bar can be positioned and transferred as a coordinated unit, providing flexibility at the system level even though individual mold bars move together.
Data Source
Figure 1a~1b
Figure 2a~2c
Figure 3a~3b
AI summary
The present invention is concerned with a plastic injection device having at least one injection station (2a, 2b) with a mold (12), a plurality of mold bar (5, 5a, 5b, 5c, 5d, 5e, 5f), which are moveable relative to the mold (12), and a transfer system for moving mold bars into and out of the mold (12). Further, the transfer system has a feeding bar (4) extending partially within and partially outside the mold (12) and arranged to receive and guide at least two mold bars such that movement of a first mold bar within the feeding bar (4) may be caused by movement of a second mold bar within said feeding bar (4). Further, the invention relates to a method for manufacturing plastic parts in a plastic injection station.