Portable X-ray Diffractometer Curved Guide Mechanism
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Solution Overview
Problem
Conventional portable X-ray diffractometers suffer from reduced measurement precision and repeatability due to mechanical issues like friction and unbalanced movements, and their large size limits their use in confined spaces for analyzing residual stresses in materials like bridge trestles or turbine blades.
Innovation Solution
A portable X-ray diffractometer with a compact design using a system of recirculating balls and a linear driving bar with a sliding drive element, allowing precise and constant movement along a curved guide, and incorporating precision adjustment means like a laser pointer and micrometer for accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rack and pinion mechanism is used to move the supporting carriage along the curved guide, then the portable X-ray diffractometer can achieve movement along the curved path, but the mechanical friction and wear reduce measurement precision and repeatability
Solution Approach 1:
The patent replaces the traditional rack and pinion mechanical transmission system with a direct electric motor drive system. The electric motor (12) is directly coupled to the supporting carriage (4) through a coupling mechanism, eliminating the intermediate rack (33) and pinion (34) components. This substitution removes the sources of mechanical friction, wear, and backlash that degraded measurement precision, while maintaining the capability to move the carriage along the curved guide (3).
Solution Approach 2:
The patent extracts and removes the rack and pinion mechanism from the system. By taking out these problematic mechanical transmission elements, the design eliminates the harmful friction and wear effects they produced, while the electric motor directly provides the necessary motion control for the supporting carriage along the curved path.
2Ease of operation
If the electric motor is fixed to the supporting carriage to enable movement, then the diffractometer can be positioned for analysis, but the unbalanced movements reduce measurement precision
Solution Approach 1:
The patent segments the motor system into two separate components: the electric motor (12) remains fixed to the base structure, while only the driving mechanism (coupling, transmission elements) is attached to the supporting carriage (4). This segmentation isolates the heavy, unbalanced motor from the moving carriage, preventing unbalanced movements during operation while still enabling precise positioning through the coupled driving mechanism.
3Reliability
If the diffractometer is designed for permanent lab installation, then stable analysis can be performed, but samples cannot be moved to the lab for analysis
Solution Approach 1:
The patent transforms the diffractometer from a static, permanently installed lab instrument into a dynamic, portable system. The supporting carriage (4) with source unit (6) and detector unit (7) is designed to move along a curved guide (3) that can be positioned at various locations. This dynamic positioning capability allows the instrument to be deployed on-site at different positions while maintaining stable measurement conditions during operation, thus achieving both reliability and adaptability.
4Weight of moving object
If the portable diffractometer is made compact for transport, then it can be moved to various locations, but the size limits access to confined spaces
Solution Approach 1:
The patent segments the diffractometer into a stationary base structure and a movable supporting carriage assembly. The carriage (4) carrying the source unit (6) and detector unit (7) can be independently positioned along the curved guide (3), allowing the measurement components to reach into confined spaces while the base remains outside. This segmentation enables access to tight areas without requiring the entire instrument to be compact enough to fit within the confined space.
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, repeatable, and constant measurements in limited spaces, facilitating on-site analysis of samples that cannot be moved, with reduced size and weight for easier transport and maintenance.
Implementation Method 1
a beam of X-rays generated by a source unit
Implementation Method 2
the same beam being reflected by the sample and acquired by a detector unit
Data Source
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AI summary
The invention is an X-ray diffractometer (1) suited to determine the residual stresses in polycrystalline materials subjected to analysis, comprising: a supporting structure (2) in which it is possible to identify a curved guide (3) essentially in the shape of an arc of a circle, along which a supporting carriage (4) is slidingly coupled; a driving unit (5) that sets the supporting carriage (4) moving along the curved guide (3); an X-ray source unit (6) and a detector unit (7), connected to the supporting carriage (4) for their rotation with respect to the point at the height of which said sample is positioned. In the X-ray diffractometer the driving unit (5) comprises: a driving bar (8) essentially arranged between the opposite ends (31, 32) of a chord of the curved guide (3) and defining a longitudinal axis (x) that lies on a plane (π) essentially parallel to the plane (ρ) defined by the same curved guide (3); a drive element (9) movable along the driving bar (8) and operatively associated with the supporting carriage (4) through articulation means (10) so as to allow the linear motion of the drive element (9) to be transformed in the curved motion of the supporting carriage (4); power means (11) associated with a first end of the driving bar (8) to set the drive element (9) moving according to the longitudinal axis (x).