Blow Molding Device Kinematic Linkage for Compact Mold Actuation
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Solution Overview
Problem
Existing blow molding systems face complexity in managing the movement of the base portion or bottom relative to the lateral supports, which complicates the optimal shaping of plastic containers during the blow molding process, especially when aiming for compactness with one lateral support fixed and the other movable.
Innovation Solution
A device with a kinematic connection between the movable lateral body and the bottom, utilizing a cam-like profile and link rod mechanism to enable cyclic movement parallel to the articulation axis, and a lever system for transferring motion between lateral bodies, allowing for independent rotation and simplifying the opening, closing, and lifting processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If one lateral support is fixed and the other is movable to achieve compactness, then device compactness is improved, but the complexity of managing the base portion movement increases
Solution Approach 1:
The patent merges the functions of the two lateral supports by making them independently movable relative to the supporting structure, rather than having one fixed and one movable. This allows the base portion to be supported by two movable elements that can work together to simplify the overall movement management while maintaining compactness.
Solution Approach 2:
The patent introduces dynamic capability to both lateral supports, allowing them to move independently relative to the supporting structure. This dynamic design enables more flexible and simplified control of the base portion movement trajectory, resolving the complexity issue while maintaining compact device geometry.
2Manufacturing precision
If the bottom has a movement trajectory with both longitudinal and transverse components to achieve optimal blow molding, then shaping quality is improved, but the implementation complexity increases
Solution Approach 1:
The patent segments the movement control into two independent parts: the lateral supports handle the transverse movement component, while the base portion's longitudinal movement is managed separately through its own actuation system. This segmentation allows each component to focus on a specific movement direction, simplifying the overall implementation while achieving the required complex trajectory for optimal shaping.
Data Source
AI summary
A device for blow molding containers, which is provided with a supporting frame for at least one station for blow molding preforms in order to obtain containers, the blow molding station including two lateral bodies and a bottom which are adapted to provide by blow molding at least one container, at least one of the two lateral bodies being movable on command by way of means for cyclic opening and closing, with respect to the supporting frame, about an articulation axis that is substantially parallel to the axis of the at least one container, means being provided for kinematic connection between the at least one movable lateral body and the bottom and being adapted to produce cyclically the movement of the bottom along a movement direction substantially parallel to the; the cyclic opening and closing means include an actuation body which is supported by a first link rod which can be moved with respect to the supporting frame about a pivoting axis which is substantially parallel to the articulation axis (101), the first link rod being kinematically connected to the at least one movable lateral body and being associated rotatably with a contoured body that defines a cam-like profile that can be engaged by at least one engagement element supported by the bottom.