Tensile Testing Machine Sliding Plate Guide Rod System
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Solution Overview
Problem
Current tensile testing machines lack precision in deformation measurements due to issues like backlash and mechanical noise, particularly in creep tests, and have accuracy problems with the relative positioning of elongation measuring means.
Innovation Solution
The machine incorporates a sliding plate system with guide rods and LVDT sensors, featuring elastic return means and ball guides to improve axial guidance and reduce mechanical play, allowing for precise measurement of specimen elongation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple and economical tensile testing machine design is used, then the device complexity is reduced, but the measurement precision deteriorates due to backlash and mechanical noise
Solution Approach 1:
The measurement system is segmented into multiple independent components: a first sliding plate with first elongation measuring means, a second sliding plate with second elongation measuring means, and an intermediate plate. This segmentation allows each component to be optimized independently while maintaining overall measurement precision without requiring a completely complex integrated design.
Solution Approach 2:
An intermediate plate is introduced as a mediator between the first and second sliding plates. This intermediate plate provides a stable reference structure that facilitates precise relative positioning between the two sliding plates, enabling accurate measurement while keeping the overall device structure relatively simple.
2Device complexity
If conventional elongation measuring means are used, then the device complexity remains low, but the measurement precision deteriorates due to relative positioning accuracy issues between measuring parts
Solution Approach 1:
The intermediate plate serves as a mediator that establishes a stable reference frame for the elongation measuring means. By fixing the measuring means to the intermediate plate and the sliding plates to the respective rods, the system achieves high relative positioning accuracy without complex positioning mechanisms.
Solution Approach 2:
The patent replaces complex mechanical positioning systems with a simpler rod-plate-sensor configuration. The elongation is measured by detecting the relative displacement between the first and second sliding plates along the axial direction, eliminating the need for complex mechanical linkages while maintaining measurement precision.
3Ease of operation
If sliding plates are allowed to move freely along the axial direction, then the ease of operation is improved, but the measurement precision deteriorates due to mechanical play and lack of guidance
Solution Approach 1:
The guide rods provide localized guidance constraints at critical positions where precision is needed, while allowing free movement elsewhere. The first guide rod guides the first sliding plate and the second guide rod guides the second sliding plate, ensuring precise axial movement without restricting the overall ease of operation.
Solution Approach 2:
The guide rods act as intermediaries between the sliding plates and the frame, providing the necessary guidance and constraint. This intermediary structure enables the sliding plates to move smoothly along the axial direction while maintaining precise positioning, resolving the contradiction between ease of operation and measurement precision.
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 configuration enhances measurement accuracy, eliminating singular points and mechanical noise, resulting in smooth and continuous deformation curves during tensile and creep tests.
Implementation Method 1
an elastic return means returning the first and third sliding plates towards each other axially
Implementation Method 2
strain measurements can be performed using inductive LVDT (Linear Variable Differential Transformer)
Data Source
AI summary
A tensile testing machine comprising a test specimen whose elongation is to be measured along a tensile axis, slide plates, an intermediate plate, and first and second parallel guide rods, which freely guide the slide plates axially past them.