Settlement Magnetic Ring Assembly for Overburden Mining Monitoring
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Solution Overview
Problem
Existing monitoring devices for dynamic development of overburden mining separated beds face challenges such as high mounting accuracy requirements, construction difficulty, high costs due to non-reusability, and instability in fixing to rock walls, especially in deep rock strata where traditional settlement magnetic rings fail to provide accurate and long-term monitoring.
Innovation Solution
A monitoring device featuring a settlement magnetic ring assembly with an anchor strap assembly that contracts and expands, allowing for adjustable mounting and recovery, and a mounting conduit system that enables stable fixation and retrieval, using long wall anchoring claws and hoop pieces with elastomers for enhanced stability and antiskid structures for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If traditional settlement magnetic ring is used for deep rock strata monitoring, then the device can be mounted in monitoring hole, but the settlement pipe may be broken at upper part during deep hole mounting due to small bearing capacity
Solution Approach 1:
The device divides the monitoring system into segments: drill rod for deep insertion, settlement magnetic ring assembly for measurement, and retrieval mechanism for recovery. This segmentation allows the drill rod to bear the insertion load while the magnetic ring assembly remains protected, solving the bearing capacity limitation of traditional settlement pipes in deep holes
Solution Approach 2:
The drill rod serves as an intermediary tool that transmits force and enables deep hole insertion without requiring the settlement pipe itself to bear the full insertion load. The drill rod's superior strength protects the settlement magnetic ring assembly during deep hole mounting operations
2Ease of operation
If settlement magnetic ring is mounted before anchoring claw bounces off, then the device can be positioned, but the magnetic ring produces displacement under dead weight effect causing inaccurate mounting position
Solution Approach 1:
The device performs preliminary anchoring by expanding the anchoring claws onto the hole wall before final positioning of the settlement magnetic ring. This preliminary action secures the device in place, preventing displacement under dead weight and ensuring accurate mounting position
Solution Approach 2:
The anchoring claws transition from a contracted state during insertion to an expanded state for anchoring, then to a locked state for final positioning. This dynamic sequence allows the device to adapt its configuration: first for easy insertion, then for precise positioning without displacement
3Ease of operation
If existing settlement magnetic ring is used for rock stratum monitoring, then the device can be mounted, but the wall grasping force is weak due to rock hardness being far stronger than soil body, causing inability to fix for long time
Solution Approach 1:
The anchoring claws feature curved surfaces that conform to the cylindrical hole wall, maximizing contact area and distributing stress evenly. This curved geometry enhances the mechanical interlocking between the claws and rock wall, providing strong grasping force capable of withstanding long-term fixation in hard rock strata
Solution Approach 2:
The device combines hard materials for the anchoring claws to engage with rock, elastic materials for the expansion mechanism, and magnetic materials for the sensing ring. This composite structure provides both the strength needed for rock anchoring and the flexibility for reliable long-term fixation
4Device complexity
If gap between settlement pipe and magnetic ring is small, then the device structure is compact, but the measuring span is limited and the magnetic ring cannot freely move if blocked by rock debris or soil grains
Solution Approach 1:
The device separates the drill rod insertion function from the magnetic ring measurement function, with sufficient clearance between them. This segmentation allows the magnetic ring to move freely within the drill rod for full measuring span while the drill rod maintains structural integrity, and prevents blocking by debris
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 solution provides stable and accurate monitoring of overburden mining separated bed development, allows for convenient operation and reuse of the monitoring device, significantly lowering costs, and improves the accuracy and reliability of monitoring results.
Implementation Method 1
an anchor strap assembly (7-3), wherein the anchor strap assembly has a contraction state and an expansion state
Implementation Method 2
a magnetic induction probe... a sinking amount of a soil layer is judged according to the position of the settlement magnetic ring
Data Source
AI summary
A monitoring device and a monitoring method for dynamic development of an overburden mining separated bed are provided. The monitoring device includes a settlement magnetic ring assembly and a mounting conduit. The settlement magnetic ring assembly includes an anchor strap assembly, a magnetic induction iron ring and a magnetic ring sleeve sleeved outside the magnetic induction iron ring. The anchor strap assembly is arranged at the outer circumference of the magnetic ring sleeve and has a contraction state and an expansion state. The anchor strap assembly in the contraction state can move in a monitoring hole, and at least two fixing points at different heights are formed in the anchor strap assembly in the expansion state and the wall of the monitoring hole in a vertical direction. Two ends of the mounting conduit are connected to a drill rod and the magnetic ring sleeve respectively.