Tunnel Gas Detector with Lifter for Deep-Hole Sampling
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Solution Overview
Problem
Existing tunnel exploration drill hole gas detection methods are inaccurate, particularly for gases like H2S and SO2, which accumulate at the bottom of drill holes, and fail to record gas concentration relationships with drilling depth, leading to labor-intensive and inefficient evaluations.
Innovation Solution
A tunnel toxic-and-harmful-gas deep-hole detection device comprising a detector, lifter, and control terminal, which allows for wireless data transmission and controlled movement of the detector within the drill hole to collect gas concentration data at various depths, using sensors to monitor tension and water levels for accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a portable gas concentration detector is used at the opening of the drill hole, then the device is easy to operate and portable, but the detection accuracy is poor because heavy gases like H2S and SO2 gather at the bottom of the drill hole and cannot be effectively detected
Solution Approach 1:
The detection process is segmented into multiple depth levels. The detector is divided into a portable unit and a lowering mechanism, allowing the detection function to be separated from the positioning function. This enables the detector to be positioned at different depths (opening, middle, bottom) to systematically capture gas distribution at various levels, resolving the contradiction between portability and detection accuracy.
Solution Approach 2:
The detection approach transitions from a single-point detection (at the opening) to multi-depth detection by introducing the depth dimension. The detector is lowered to different depths along the vertical axis, enabling detection at the bottom where heavy gases accumulate, thereby maintaining portability while significantly improving detection accuracy for heavy gases.
2Loss of information
If manual recording of gas concentration at different depths is performed, then the relationship between gas concentration and drilling depth can be obtained, but the labor intensity is high and efficiency is low
Solution Approach 1:
The system implements automated feedback by connecting the detector to a data recording system. As the detector measures gas concentration at different depths, the data is automatically recorded and associated with the corresponding depth information. This feedback mechanism eliminates manual recording, reducing labor intensity while maintaining complete gas concentration-depth relationship data, thus resolving the contradiction between information completeness and productivity.
Solution Approach 2:
The detection system performs self-recording of detection data at different depths. The automated system independently captures, stores, and processes the gas concentration data along with depth information without requiring manual intervention for recording, thereby maintaining accurate gas concentration-depth relationships while significantly improving detection efficiency and reducing labor requirements.
3Measurement precision
If the detector is manually lowered and raised in the drill hole, then gas detection at different depths is possible, but the detection process is time-consuming and error-prone
Solution Approach 1:
The system transitions from static detection (fixed at opening) to dynamic detection (movable at different depths). The detector is equipped with a lowering and raising mechanism that enables it to dynamically position itself at various depths within the drill hole. This dynamic capability allows systematic multi-depth detection to be performed efficiently, maintaining measurement precision while reducing the time required compared to repeated manual operations.
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
Enables real-time, accurate detection of gas components and concentrations at different depths, establishing a reliable relationship between gas concentration and drilling depth, improving efficiency and reducing errors in tunnel gas evaluations.
Implementation Method 1
A gas detector and a gas sampler are arranged in the shell, and the air inlet is located therebetween
Implementation Method 2
A tension sensor is arranged in an inner cavity of the exhaust net cover. The tension sensor is fixed to the shell and is connected with a cable of the lifter
Implementation Method 3
A level sensor is arranged in an inner cavity of the guard net cover
Implementation Method 4
An exhaust end waterproof gas-permeable membrane is adhered to the inner wall of the exhaust net cover and is used for preventing water from entering the interior of the detection device through the exhaust net cover
Data Source
AI summary
The present invention discloses a tunnel toxic-and-harmful-gas deep-hole detection device and method. The tunnel toxic-and-harmful-gas deep-hole detection device comprises a detector, a lifter, and a control terminal, which are sequentially connected. The control terminal controls the lifter to achieve movement of the lifter. The detector comprises a shell with a hollow interior and two opened ends. An air inlet is formed in the outer wall of the shell. A gas detector and a gas sampler are arranged in the shell, and the air inlet is located therebetween. The tunnel toxic-and-harmful-gas deep-hole detection method comprises two steps, namely a gas detection step and a gas sampling step. The present invention can effectively detect components and concentrations of various gases in a drill hole, wherein the detection data is real-time and accurate.