Universal Sensor Fixing Device for Rock Mechanics Testing
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Solution Overview
Problem
Current acoustic emission test sensors in rock mechanical experiments lack effective fixing devices, leading to issues with parallelism, coupling, and consistency, especially with irregularly shaped test pieces, resulting in inaccurate and inefficient testing due to adhesion failures and pseudo signals.
Innovation Solution
A universal acoustic emission test sensor fixing device with a radial positioning mechanism, supporting arms, bases, and parallelism adjusting members forms a universal revolute pair using ball heads and spherical holes, ensuring secure and parallel attachment of sensors to variously shaped test members, utilizing elastic members to maintain consistent force and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rubber belt winding or bungee fastening is used to fix acoustic emission sensors, then the fixing process is simple, but fine parallelism between sensor end face and coupling face cannot be ensured and fine coupling is difficult
Solution Approach 1:
The patent introduces a specialized fixing device as an intermediary between the sensor and tested member. This device includes positioning mechanisms and parallelism adjusting members that mediate the connection, ensuring fine parallelism and accurate coupling while maintaining ease of operation through standardized attachment procedures.
Solution Approach 2:
The fixing device performs preliminary positioning and parallelism adjustment before final sensor attachment. The positioning mechanisms pre-establish the correct geometric relationship between sensor and coupling face, eliminating the need for complex post-adjustment procedures.
2Reliability
If couplers such as butter or vaseline are used, then coupling between sensor and tested member is achieved, but adhesion reduction or failure of rubber belt occurs
Solution Approach 1:
The fixing device acts as an intermediary that provides mechanical coupling through positioning mechanisms and pressing structures, reducing or eliminating the need for organic couplers like butter or vaseline. This prevents adhesion failure of rubber belts while maintaining reliable sensor coupling through controlled mechanical contact.
Solution Approach 2:
The patent replaces chemical coupling methods (butter, vaseline) with mechanical coupling mechanisms including positioning structures and pressing members. This substitution eliminates the adhesion problems associated with organic couplers while achieving reliable mechanical coupling.
3Ease of operation
If rubber belt is used for fixing, then initial sensor attachment is achieved, but great binding forms during radial swelling and deforming causing sensor damage
Solution Approach 1:
The fixing device incorporates dynamic adjustment capabilities with parallelism adjusting members that can adapt to radial swelling and deformation of tested members. The positioning mechanisms maintain appropriate pressure and alignment throughout the deformation process, preventing excessive binding forces that would damage the sensor.
Solution Approach 2:
The fixing device allows parameter changes in positioning and pressing force during the testing process. As the tested member undergoes radial swelling, the adjustable mechanisms modify the contact parameters to maintain optimal coupling without creating damaging binding forces on the sensor.
4Ease of operation
If bungee is used for fastening, then sensor attachment is achieved, but sensor tumbles and fine contact cannot be ensured
Solution Approach 1:
The fixing device serves as an intermediary that provides stable positioning through positioning mechanisms and parallelism adjusting members. This intermediary structure prevents sensor tumbling by maintaining geometric constraints, ensuring fine and consistent contact between the sensor surface and the tested member throughout the testing process.
5Productivity
If conventional fixing methods are used, then sensor mounting is completed, but consistency of force to sensor in same batch of tested members cannot be ensured resulting in pseudo signals
Solution Approach 1:
The fixing device provides universal positioning and force application mechanisms that work consistently across different tested members in the same batch. The standardized positioning mechanisms and adjustable pressing members ensure uniform force application, eliminating variations that cause pseudo signals while maintaining efficient mounting procedures.
6Ease of operation
If rubber belt or bungee fixing is used, then sensor attachment is achieved, but mounting of other deforming test sensors becomes very inconvenient
Solution Approach 1:
The fixing device incorporates universal positioning mechanisms and standardized mounting interfaces that accommodate multiple types of test sensors including acoustic emission sensors and deforming sensors. The parallelism adjusting members and positioning structures provide a versatile platform that simplifies the mounting of various sensor types without requiring separate fixing systems.
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 ensures accurate and truthful test results by maintaining sensor parallelism and consistency, reducing pseudo signals, and allowing for convenient sensor placement and adjustment during testing, improving test efficiency and sensor longevity.
Implementation Method 1
The radial positioning mechanism comprises two elastomers and one screw... the elastomers are respectively connected with rigid ends... the screw forms screw pairs respectively with the screw holes in the two rigid ends
Implementation Method 2
the ball heads of the two auxiliary supporting arms are respectively located within the spherical holes of the two bases to form universal revolute pairs
Data Source
AI summary
A universal multipurpose sensor fixing device comprises a radial positioning mechanism, supporting mechanisms, bases, acoustic emission test sensor mounting mechanisms, and parallelism adjusting members. Each supporting mechanism includes a main arm and an auxiliary arm having one end connected to the main arm and a ball head on the other end. A parallelism adjusting member mounting mechanism is provided at the joint of the main arm and the auxiliary arm. The main arms are respectively connected to the two free ends of the radial positioning mechanism to position the auxiliary arms at the inner sides of the main arms, arranged axis symmetrically with respect to the central line of the radial positioning mechanism. The ball heads of the two auxiliary arms are located within spherical holes of the bases to form universal revolute pairs. A set of acoustic emission test sensor mounting mechanisms are mounted at each base.