Measuring Scale Assembly With Thermal Expansion Decoupling
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Solution Overview
Problem
Position measuring devices face challenges in achieving high resolution and accuracy while accommodating thermal expansion differences between materials, requiring a fixation method that prevents constraining forces during temperature changes.
Innovation Solution
A compact arrangement with a main carrier, intermediate carrier, and scale, featuring multiple fastening elements that provide rigid and rotational support, allowing for double decoupling in translational degrees of freedom and thermal insulation, ensuring no constraining forces are exerted on the scale during temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the scale is directly attached to the main carrier, then the device structure is simple, but thermal expansion differences cause constraining forces that reduce measurement accuracy
Solution Approach 1:
The patent divides the attachment system into multiple segments: the main carrier, intermediate carriers (first and second), and the scale. This segmentation allows each component to move independently to accommodate thermal expansion while maintaining overall structural integrity, thereby preventing constraining forces on the scale.
Solution Approach 2:
The patent introduces intermediate carriers as mediator components between the main carrier and the scale. These intermediaries absorb thermal expansion differences through their own movement capabilities, preventing direct transmission of constraining forces to the scale and maintaining measurement accuracy.
2Ease of manufacture
If the scale is fixed rigidly at one point, then the attachment is simple, but thermal expansion causes constraining forces that reduce measurement precision
Solution Approach 1:
Instead of a single rigid fixation point, the patent segments the attachment into multiple points with different characteristics: one rigid fixation point and one or more elastic attachment points. This allows the scale to be securely attached while accommodating thermal expansion through the elastic points.
Solution Approach 2:
The patent applies different attachment qualities at different locations: rigid attachment at certain points for stability and elastic attachment at other points for thermal accommodation. This local differentiation allows the system to maintain both ease of manufacture and measurement precision.
3Measurement precision
If multiple fastening elements are used to decouple the scale thermally, then measurement accuracy is maintained, but the device complexity increases
Solution Approach 1:
The patent uses segmentation to create a modular multi-carrier structure where each carrier performs a specific function. This modular approach, while increasing component count, allows for standardized manufacturing and assembly, partially offsetting the complexity increase through design regularity.
Solution Approach 2:
The intermediate carriers serve multiple functions: they provide thermal decoupling, enable relative movement, and maintain structural support. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in overall device complexity.
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
Enables precise position measurement with reduced thermal interference, allowing for the scale to move freely relative to the main carrier, maintaining accuracy and resolution while preventing direct heat transfer and facilitating easy replacement of the intermediate carrier if damaged.
Implementation Method 1
In most cases, the scale and the carrier consist of materials with different thermal expansion properties
Implementation Method 2
The second support forms an elastic attachment point, so that, starting from the fixing support, a thermally induced longitudinal displacement of the scale relative to the carrier body is possible
Data Source
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AI summary
An arrangement (10) comprises a main beam (12), an intermediate beam (14) arranged on the main beam (12), and a scale (16) arranged on the intermediate beam (14). The arrangement (10) includes a first and second fastening element (22, 24) integrated into the main beam (12) and a third and fourth fastening element (26, 28). The first fastening element (22) is configured such that it rigidly supports the intermediate beam (14) at a first position (P1) in the longitudinal direction (X) on the main beam (12). The second fastening element (24) is configured such that it supports the intermediate beam (14) at a second position (P2) in the longitudinal direction (X), which differs from the first position (P1), allowing it to move freely relative to the main beam (12). The third fastening element (26) is designed such that it rigidly supports the scale (16) at the first position (P1) in the longitudinal direction (X) on the intermediate support (14).The fourth fastening element (28) is designed such that it carries the scale (16) in a third position (P3) that differs from the first position (P1) and the second position (P2) in the longitudinal direction (X) so as to be freely movable relative to the intermediate support (14).