Extrusion Device Prestressing Element Alignment
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Solution Overview
Problem
Existing extrusion devices face issues with unreliable strip fixation, leading to unintended displacement and undefined gap sizes due to obliquely applied fixing forces, resulting in inconsistent material thickness and homogeneity during profile production.
Innovation Solution
The extrusion device employs a pivoting lever as a prestressing element with variable contact surfaces and a double-armed lever mechanism to ensure parallel alignment of the pressure transmission element with the strip, allowing for self-aligning force application and adjustable contact pressure, along with a pivotable carrier and spring-loaded prestressing element for controlled gap adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clamp is used to fix the strip, then the strip can be held in position, but the fixing force presses obliquely on the strip causing unintended displacement and undefined gap size
Solution Approach 1:
The pressure transmission element is designed to be pivotable about an axis parallel to the roller axis, allowing it to dynamically adjust its orientation. This pivoting capability enables the element to self-align and maintain a parallel orientation with the pressure surface of the strip during operation, ensuring that the fixing force is always applied perpendicularly to the strip surface rather than obliquely.
Solution Approach 2:
The pressure transmission element acts as an intermediary between the fixing element and the strip. By introducing this intermediate component with pivotable connection, the system transforms the oblique fixing force into a perpendicular force application on the strip, while the pivotable connection absorbs any misalignment or displacement tendencies.
2Device complexity
If the pressure transmission element has a structurally predetermined orientation, then the structure is simple, but it cannot adapt to deviations from parallel orientation with the pressure surface
Solution Approach 1:
The pressure transmission element is designed to be pivotable about an axis parallel to the roller axis, allowing it to dynamically adjust its orientation. This pivoting capability enables the element to self-align and maintain a parallel orientation with the pressure surface of the strip during operation, ensuring that the fixing force is always applied perpendicularly to the strip surface rather than obliquely.
3Device complexity
If the fixing force is applied with a fixed direction, then the mechanism is simple, but it cannot compensate for deviations in parallel orientation
Solution Approach 1:
The pressure transmission element is designed to be pivotable about an axis parallel to the roller axis, allowing it to dynamically adjust its orientation. This pivoting capability enables the element to self-align and maintain a parallel orientation with the pressure surface of the strip during operation, ensuring that the fixing force is always applied perpendicularly to the strip surface rather than obliquely.
Solution Approach 2:
The pivotable connection provides a form of mechanical feedback where the orientation of the pressure transmission element automatically adjusts in response to any deviations or misalignments. The element naturally seeks and maintains the correct parallel orientation through its pivoting capability, providing self-correction without requiring external control systems.
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
This solution ensures reliable and consistent strip positioning, maintaining parallel alignment and adjustable contact pressure, reducing the risk of jamming and allowing for automatic adjustment of the gap, thereby achieving uniform material thickness and homogeneity in profile production.
Implementation Method 1
the strip is prestressed by a prestressing element in the radial direction in relation to the roller with respect to the latter in the operating position with a force
Implementation Method 2
the prestressing element is designed as a pivoting lever which can be pivoted about a tensioning axis parallel to the roller axis, in order not only to enable the force introduced to be amplified by means of appropriately dimensioned lever arms
Data Source
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AI summary
The invention relates to an extrusion device for producing a profile from plasticizable material. A strip (3) defining a roller gap is pre-tensioned in a predetermined position against the contact surface (10) by means of a fixing element (11) with a force Ft. For this purpose, the fixing element (11) has a planar pressure transmission element (12) which bears against a pressure surface (13) of the strip (3). To automatically adjust the desired parallel orientation of the pressure transmission element (12) relative to the pressure surface (13), the pressure transmission element (12) is designed as a double-armed lever. Furthermore, the extrusion device is equipped with a pre-tensioning element (20) pivotable about a clamping axis (19), by which the strip (3) is additionally pre-tensioned against the roller (2) in the radial direction with a force (Fr).By pivoting the prestressing element (20), the strip (3) is relieved of both tension forces.