Spherical Alignment Device for Material Testing Force Transmission
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Solution Overview
Problem
Material testing machines face challenges in minimizing measurement errors due to position, angle, and offset errors during sample preparation and clamping, which can lead to non-reproducible results.
Innovation Solution
An alignment device with adjustable pressure elements, including a combination of adjusting screws and segment cushions, is used to compensate for offsets and angular deviations between test force transmission rods, allowing for precise alignment before testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If alignment devices are installed to minimize position and angle errors, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The alignment device enables self-alignment of the test piece through the spherical surface and ball socket mechanism, eliminating the need for complex external alignment systems. The operator simply places the test piece, and the spherical interface automatically compensates for angular deviations and position errors, achieving high measurement precision without adding significant device complexity.
Solution Approach 2:
The spherical surface on the test force transmission rod acts as an intermediary element between the rod and the ball socket in the alignment device. This spherical interface mediates the connection, allowing automatic alignment and compensation of errors while maintaining a relatively simple overall device structure.
2Reliability
If additional alignment components are added to eliminate transverse forces, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The alignment device performs self-alignment automatically through the spherical surface and ball socket mechanism. The operator only needs to place the test piece into position, and the system automatically compensates for misalignments and eliminates transverse forces, maintaining ease of operation while significantly improving reliability.
3Manufacturing precision
If spherical surface alignment is implemented, then manufacturing precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The invention implements a spherical surface on the end of the test force transmission rod that interfaces with a ball socket in the alignment device. This spherical geometry enables automatic alignment and compensation of position and angle errors, achieving high manufacturing precision. While spherical components require slightly more complex manufacturing than simple cylindrical rods, the design remains relatively straightforward and is well-suited for standard machining processes.
Data Source
Figure 1
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AI summary
The alignment device (10) comprises a moving crosshead (11,12) and a test load transmission device (41), whose front side on an end is designed rollable in a bending shape for the angle change caused by the material testing machine (1). The front side is in contact with a bent inner side of an inner housing, and the inner housing is supported against an outer housing (51) over one of the pressure elements (30a). The inner housing is a trough-shaped bearing housing, whose trough base is readjusted in areas of the arcuate front side of the test load transmission device.