Non-welded Stress Testing Device for Power Plant Boiler Components
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Solution Overview
Problem
Existing stress-strain monitoring methods for high-temperature pressure-bearing components in power plant boilers require welding an optical fiber to the pipeline surface, making it difficult to remove the substrate for secondary detection.
Innovation Solution
A device comprising an adjusting assembly with bearing blocks, connecting rods, and an elastic member, along with a test assembly that includes double-headed motors and a rotating shaft, allows for stress testing of high-temperature components without welding, by adjusting the device to fit the pipeline caliber and using a high-temperature binder to secure the optical fiber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical fiber is welded to the pipeline surface through a substrate, then measurement precision and reliability are improved, but ease of operation deteriorates because the substrate cannot be easily removed for secondary detection
Solution Approach 1:
The device is divided into multiple detachable bearing blocks that can be independently positioned and removed. Each bearing block contains an optical fiber sensor that can be separately installed and removed from the pipeline surface, allowing secondary detection without removing the entire substrate system
Solution Approach 2:
The bearing blocks are designed with adjustable positioning mechanisms that allow them to be dynamically installed and removed from the pipeline. The optical fiber sensors are temporarily fixed during detection and can be easily removed afterward, transforming the static welded connection into a dynamic, reversible attachment process
2Reliability
If a substrate is used to weld the optical fiber to the pipeline, then reliability of the connection is improved, but device complexity increases due to the additional substrate component
Solution Approach 1:
The substrate is extracted from the system and replaced by bearing blocks that directly contact the pipeline surface. The optical fiber sensors are mounted on these simplified bearing blocks without requiring a separate substrate layer, reducing overall device complexity while maintaining reliable connection through direct bearing block-to-pipeline contact
Solution Approach 2:
The bearing blocks serve as intermediary elements between the optical fiber sensors and the pipeline surface. These blocks provide a reliable connection interface while being simpler in structure than the traditional substrate, acting as a mediating component that reduces complexity compared to the original substrate-based system
3Adaptability or versatility
If the detectable range is increased to cover larger pipeline calibers, then adaptability is improved, but device complexity increases due to additional adjusting mechanisms
Solution Approach 1:
The bearing blocks are designed as universal components that can be adjusted to fit different pipeline calibers. The adjusting assembly uses standardized mechanisms that can accommodate various pipe sizes, allowing the same basic device structure to serve multiple detection applications across different pipeline dimensions without requiring completely different device configurations
Solution Approach 2:
The device achieves adaptability to different pipeline calibers by changing geometric parameters of the bearing blocks and connecting rods. The adjusting mechanisms modify the spatial dimensions and angles of the device components to match different pipeline sizes, allowing the same device to adapt to various calibers through parameter adjustment rather than structural redesign
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
The device enables real-time, non-contact stress monitoring of high-temperature components, improves the detectable range, and facilitates easy disassembly and secondary detection by avoiding substrate welding.
Implementation Method 1
light waves of the light source are used to sense a strain condition through an optical fiber grating sensor, and information is reflected in real time through a signal demodulation system
Implementation Method 2
an elastic member, a first connecting rod, and a second connecting rod are disposed in the accommodating groove
Data Source
AI summary
The present invention belongs to the technical field of stress detection and provides a method and device for testing stress of a high-temperature component of a power plant boiler. The adjusting assembly includes a plurality of bearing blocks, each bearing block is provided with an accommodating groove vertically, limiting blocks are disposed at two ends of the accommodating groove symmetrically, an elastic member, a first connecting rod, and a second connecting rod are disposed in the accommodating groove, and a limiting plate is fixedly connected to one end of each of the first connecting rod and the second connecting rod. According to the present invention, lengths of the first connecting rod and the second connecting rod extending out of the accommodating groove are adjusted, so that the device can be adjusted according to a caliber of a pipeline of the power plant boiler.