Borehole Wall Grinding Device for Accurate Elastic Modulus Measurement
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Solution Overview
Problem
Current in-situ measurement methods for rock elasticity in boreholes face significant errors due to incomplete contact between the measuring pressure head and the curved inner wall of rock boreholes, leading to inaccurate elastic modulus measurements.
Innovation Solution
A device is designed to grind the side surface of the rock borehole inner wall to form two parallel planes, allowing for full contact with the measuring pressure head, utilizing a system comprising a direct current motor, right-angle drive steering gear, grinding cylinder, and displacement sensor for precise grinding and real-time monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rigid loading plate with radian section is used to measure elastic modulus in different directions, then directional measurement capability is improved, but contact area with curved borehole wall remains small leading to measurement error
Solution Approach 1:
The patent applies preliminary action by grinding the curved borehole wall surface into a flat surface before conducting elastic modulus measurements. This pre-processing step creates an optimal measurement surface that ensures full contact between the loading plate and borehole wall, eliminating contact area issues and improving measurement precision before the actual measurement takes place.
Solution Approach 2:
The patent transforms the curved borehole wall surface into a flat surface through grinding. This changes the geometric form from curved to flat, allowing the rigid loading plate with radian section to achieve complete contact with the borehole wall, thereby improving both contact area and measurement precision while maintaining directional measurement capability.
2Reliability
If traditional in-situ measurement device is used, then measurement of rock elasticity is achieved, but incomplete contact between pressure head and borehole wall causes large errors
Solution Approach 1:
The measurement process is divided into two stages: first, the borehole wall is ground to create a flat surface; second, the elastic modulus measurement is performed. This preliminary action of surface preparation ensures that when the pressure head contacts the borehole wall, complete contact is achieved, eliminating the error of incomplete contact and improving measurement precision.
Solution Approach 2:
The patent replaces the direct contact measurement approach with a two-stage process involving mechanical grinding followed by measurement. The grinding mechanism transforms the borehole wall surface geometry, substituting the problematic direct contact scenario with a controlled surface preparation step that ensures optimal contact conditions for subsequent measurement.
3Measurement precision
If grinding device is added to prepare borehole wall surface, then contact area is improved, but device complexity increases
Solution Approach 1:
The patent merges the grinding function and measurement function into a single integrated device. The grinding mechanism and the elastic modulus measurement system are combined in one apparatus, allowing both surface preparation and measurement to be performed sequentially without requiring separate equipment, thereby improving contact area while limiting the increase in device complexity.
Solution Approach 2:
The device is designed with multi-functionality, incorporating both grinding capabilities and measurement capabilities in a single universal apparatus. This allows the device to perform surface preparation and elastic modulus measurement tasks, reducing the need for multiple separate devices and managing overall system complexity while achieving improved contact area.
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 achieves high automation and visualization with reduced measurement errors, environmental sustainability, and compact, portable equipment, ensuring accurate elastic modulus measurements by ensuring full contact between the pressure head and the ground surfaces.
Implementation Method 1
a direct current motor is fixedly installed on the base, one end of the direct current motor is electrically connected to a controller, and the other end of the direct current motor is in drive connection with a second rotating shaft of a right-angle drive steering gear
Implementation Method 2
the grinding cylinder drives the translation movable plate to move left and right, and then the grinding heads are driven to move to grind the cambered surface of the inner wall of the rock borehole
Data Source
AI summary
A device for grinding a side surface of an inner wall of a borehole comprises a base on which a direct current motor is installed on the base, one end of the direct current motor is electrically connected to a controller, and the other end of the direct current motor is in drive connection with a second rotating shaft of a right-angle drive steering gear by a universal drive joint. The controller is connected to an air pressure valve by a cable, and the air pressure valve is connected to an air pump through an air pipe. One end, away from the universal drive joint, of the right-angle drive steering gear is provided with a grinding cylinder. Grinding heads are respectively connected to first rotating shafts at both sides of the right-angle drive steering gear.