Acoustic Emission Sensor Fixing for Rock Breaking Tests
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing acoustic emission test systems for rock breaking under high temperature and high pressure suffer from signal interference and inaccuracy due to unstable sensor fixation, signal line bending, and temperature-related issues, leading to poor test data quality and increased maintenance costs.
Innovation Solution
A tempo-spatial evolution test system with a triaxial cavity coupling bracket and acoustic emission amplifier assembly that maintains stable sensor contact, uses a PVC heat insulation layer, and employs a clamp fixing spring to ensure accurate signal transmission and reduce temperature interference, featuring a triaxial cavity lifting oil cylinder and guide columns for precise movement and heat insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If acoustic emission sensors are fixed using adhesive bonding or tape wrapping, then the sensors can be easily installed, but the sensors may move or fall off during the test process, causing signal transmission interruption and requiring frequent maintenance
Solution Approach 1:
The fixing device is divided into multiple components: a fixing sleeve that fits over the sensor, a clamping mechanism with adjustable clamps, and a mounting bracket. This segmentation allows for easy installation while providing reliable signal transmission by securing the sensor firmly in place during testing
Solution Approach 2:
The clamping mechanism features adjustable clamps that can be tightened or loosened as needed. This dynamic adjustment capability allows operators to easily install and remove sensors while ensuring stable signal transmission when clamped securely during the test process
2Device complexity
If acoustic emission amplifiers are placed on rear platforms or tied to upright columns, then the system structure is simplified, but signal line bending or kinking occurs, negatively impacting signal transmission quality
Solution Approach 1:
A signal line protection conduit acts as an intermediary between the amplifier and the sensor, guiding the signal line along a protected path that prevents bending or kinking. This intermediary structure maintains simple system layout while ensuring high-quality signal transmission throughout the test process
3Adaptability or versatility
If acoustic emission amplifiers contact the triaxial cavities under high temperature conditions, then the system integration is improved, but the transmitted signals become disordered, preventing acquisition of accurate test data
Solution Approach 1:
The acoustic emission amplifier is extracted from direct contact with the high-temperature triaxial cavity environment and placed in a separate, temperature-controlled location. This separation maintains system integration through coordinated positioning while protecting the amplifier from thermal interference that would otherwise disorder the transmitted signals
4Device complexity
If no dedicated fixing device is provided for acoustic emission sensors, then the device complexity is reduced, but the contact stability between sensors and triaxial cavities deteriorates, leading to poor test data quality
Solution Approach 1:
The fixing device provides localized, precise positioning features including a tapered bore in the fixing sleeve that matches the sensor geometry, and adjustable clamps that apply localized pressure at specific points. This localized quality enhancement ensures optimal sensor-cavity contact and signal accuracy without requiring complex overall device structure
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 system provides stable and accurate acoustic emission signal transmission, reduces maintenance needs, and extends sensor lifespan, ensuring reliable rock mechanics test data under high temperature and pressure conditions.
Implementation Method 1
a clamp fixing spring connecting the N acoustic emission detection heads end to end to form a ring... the clamp fixing spring connecting the acoustic emission sensors provides a clamping force forcing the acoustic emission detection heads to be firmly clamped on the outer wall of the triaxial cavity
Implementation Method 2
Between the outer metal cylinder and the inner metal cylinder coaxially sleeved there is formed a condensation cavity communicating with the cooling water circulation pipeline
Implementation Method 3
cooling water circulation pipeline
Implementation Method 4
acoustic emission sensor assembly... acoustic emission detection heads... the acoustic emission sensor and the acoustic emission sensor clamp
Data Source
AI summary
A tempo-spatial evolution test system for rock breaking in deep and complex environment includes an acoustic emission sensor assembly and an acoustic emission amplifier assembly that are arranged on a rock mechanics test system. A triaxial cavity coupling bracket is arranged on an outer wall of the triaxial cavity and between two sets of acoustic emission sensor assemblies. The triaxial cavity coupling bracket includes a plate-shaped bracket, two sickle-shaped brackets, and at least three bracket bolts, which can be tightly wrapped on the outer wall of the triaxial cavity. A lateral side of the plate-shaped bracket vertically fixes two guide columns. The acoustic emission amplifier assembly is arranged between the two guide columns and is located above the plate-shaped bracket, and the acoustic emission amplifier assembly is connected to the acoustic emission sensor assembly through a signal line.