Rotatable Blow Mould Toggle Lever Closure
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Solution Overview
Problem
Existing mold designs for blow molding hollow bodies, especially in hydraulic shaping, face challenges in securely holding the mold closed under high pressure while maintaining simplicity for cleaning, as complex mechanisms like air cushions or moving wedges complicate the cleaning process and risk soiling during filling.
Innovation Solution
A two-part mold with rotatable parts connected to toggle levers and an actuating mechanism, where the toggle levers are positioned near their dead center to exert an elastic force, allowing secure closure with minimal force and keeping the complex mechanism separate from the mold's operational area, facilitating easy cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air cushions or moving wedges are used to hold the mold closed under high pressure, then the mold can be securely closed, but the structure becomes more complex and difficult to clean
Solution Approach 1:
The patent extracts the complex closing mechanism (toggle levers with elastic force) from the direct mold closure path, positioning it remotely to act on the mold parts through a simpler connection. This separates the high-force generation function from the mold contact area, making the mold easier to clean while maintaining secure closure through the mechanical advantage of the toggle lever system.
Solution Approach 2:
The toggle levers act as intermediary mechanical elements between the elastic force source and the mold parts. They transmit and amplify the elastic force to achieve secure mold closure without requiring complex pneumatic or hydraulic systems directly at the mold interface, thus simplifying the overall structure while maintaining reliability.
2Reliability
If complex closing mechanisms like air cushions are used, then the mold can be held closed under high pressure, but cleaning becomes more difficult and soiling risk increases
Solution Approach 1:
The complex toggle lever mechanism with elastic force is positioned remotely from the mold cavity, extracting it from the area that requires frequent cleaning. This allows the mold surfaces to be accessed and cleaned easily while the closure mechanism remains isolated, reducing soiling risk and simplifying maintenance operations.
Solution Approach 2:
The elastic force in the toggle lever mechanism automatically maintains mold closure without requiring external control systems or frequent adjustments. This self-regulating feature reduces the need for complex control mechanisms that would require cleaning, while the simple mechanical structure that remains is easily maintainable.
3Force
If toggle levers are positioned near dead center with elastic force, then minimal force is needed to keep mold closed, but the mechanism must be precisely positioned
Solution Approach 1:
The patent changes the operational parameter of the toggle levers by positioning them near the dead center position where mechanical advantage is maximized. This parameter change reduces the force required to maintain mold closure, though it requires precise manufacturing and assembly to achieve the correct initial positioning for optimal mechanical advantage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design ensures the mold remains securely closed under high pressure with reduced operational complexity, allowing for straightforward cleaning and protection from soiling during hydraulic molding and filling processes.
Implementation Method 1
the actuating mechanism exerts an elastic force on the connecting axis of the toggle levers in the direction of their dead center
Data Source
AI summary
The present invention relates to a mold for molding hollow bodies from parisons. It is the object of the invention to provide such a mold having a closing mechanism, which allows the mold to be securely held closed even under high pressure and which is in addition easy to clean. The object is achieved according to the invention by a two-part mold (1a, 1b) for molding hollow bodies, in particular containers, from parisons by way of a gaseous or liquid pressure medium introduced under pressure into the parison, in which at least a part of the mold (1a, 1b) is supported so it is rotatable about an axis of rotation (3), and therefore the two parts are transferable from an open position into a closed position, and wherein each mold part (1a, 1b) is connected to one end of a toggle lever (4a, 4b) so it is rotatable about an axis (5a, 5b) parallel to the axis of rotation (3). The two other ends of the two toggle levers are connected to one another and to an actuating mechanism (7, 8, 9) so they are rotatable about an axis (6) parallel to the axis of rotation. The mold is characterized according to the invention in that the toggle levers (4a, 4b) are located shortly before their dead center in the closed position of the mold and the actuating mechanism (7, 8, 9) exerts an elastic force on the connecting axis (6) of the toggle levers (4a, 4b) in the direction of their dead center.