Intelligent Probing Rod for Deep Goaf Detection
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Solution Overview
Problem
Deep coal mining and downhole rescue sites present challenges due to extreme depths, unstable rock strata, and complex internal structures, making direct access and effective detection difficult, especially in emergency situations where separate drilling and detection processes are inefficient.
Innovation Solution
An internal peeping detection-while-drilling system comprising an intelligent probing rod with sensors, cable drill pipes, a signal relay sub, a ground control terminal, and remote data transmission system, which integrates drilling and detection by forming a stable channel and enabling real-time 3D imaging and communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If ground borehole drilling is performed to reach deep goaf, then detection channel can be formed, but the overlying stratum experiences violent mining disturbance making stable drilling channel formation difficult
Solution Approach 1:
The drill pipe assembly is divided into multiple cable drill pipe assemblies connected in series, allowing the drilling system to reach deep goaf while maintaining stability through modular segmentation. Each cable drill pipe assembly can be independently managed and replaced, solving the problem of maintaining stable drilling channel formation in mining-disturbed strata.
Solution Approach 2:
A protective transmission mechanism is introduced as an intermediary between the drilling bit and the instrument cabin, protecting the instrument cabin during drilling operations and enabling stable channel formation through the violent mining-disturbed strata. The protective mechanism extends out to expose the instrument cabin only after entering the target goaf.
2Measurement precision
If separate drilling and detection processes are performed, then each function can be performed thoroughly, but efficiency is low and accident handling requirements cannot be met
Solution Approach 1:
The system merges drilling and detection functions into a single integrated drill pipe assembly. The intelligent probing rod with instrument cabin performs detection functions while being drilled into the goaf, eliminating the need for separate drilling and detection operations. This resolves the contradiction by achieving both thorough detection and high efficiency simultaneously.
Solution Approach 2:
The drill pipe assembly serves multiple functions: it drills into the goaf, protects the instrument cabin, transmits data and power, and enables detection. The cable drill pipes not only serve as drilling tools but also as transmission channels for power and data, demonstrating multi-functionality that improves both detection accuracy and efficiency.
3Reliability
If instrument cabin is protected during drilling, then instrument safety is ensured, but detection capability is limited until after entering target goaf
Solution Approach 1:
The protective transmission mechanism is designed to be dynamic, protecting the instrument cabin during drilling operations and then extending out to expose the instrument cabin after entering the target goaf. This dynamic transformation allows the system to switch between protection mode and detection mode, resolving the contradiction between instrument safety and detection accessibility.
4Loss of information
If data transmission cable is laid through cable drill pipes, then power and data transmission is enabled, but signal attenuation occurs over long distances
Solution Approach 1:
The transmission system is segmented into multiple cable drill pipe assemblies with signal relay subs positioned at intervals. Each relay sub receives, processes, and retransmits signals, dividing the long transmission distance into shorter segments. This segmentation reduces signal attenuation and maintains data transmission fidelity over long distances to deep goaf.
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
Enhances detection efficiency, facilitates emergency rescues by providing real-time visualization and bidirectional communication, overcoming the limitations of complex environments and improving detection accuracy through integrated drilling and detection technology.
Implementation Method 1
a sensor assembly including a sonar sensor, a lidar sensor and an audio and video sensor is provided in the instrument cabin
Implementation Method 2
a sensor assembly including a sonar sensor, a lidar sensor and an audio and video sensor is provided in the instrument cabin
Implementation Method 3
the transmission cable is configured to transmit acquired data of the sensor assembly to the ground control terminal in the form of the power carrier
Implementation Method 4
the signal relay receives a power carrier signal of a transmission cable in the lower cable drill pipe, performs demodulation, preprocessing, gain amplification, denoising, storage and modulation on the power carrier signal
Data Source
AI summary
An internal peeping detection-while-drilling system includes an intelligent probing rod, cable drill pipes, a signal relay sub, a ground control terminal, a data interpretation and goaf reconstruction imaging software system, and a remote data transmission system, where the intelligent probing rod includes an up-down separated protective transmission mechanism and an instrument cabin; the intelligent probing rod includes a lower end connected to a drilling bit, and an upper end connected to each of the cable drill pipes; the instrument cabin is provided in the up-down separated protective transmission mechanism, and provided with a sonar-lidar-audio/video sensor assembly; the cable drill pipes are connected to each other to form a cable and data transmission channel; the signal relay sub is provided between the cable drill pipes at intervals; and an uppermost end of the cable drill pipe is connected to the ground control terminal.