Integrated Hole Sealing Device for Underground Blasting
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Solution Overview
Problem
Current hole sealing methods in underground coal mining, such as using yellow sand, are labor-intensive and ineffective, and existing devices like the water-expanded capsule are prone to damage during loosening blasting due to inadequate protection and are not suitable for comprehensive prevention and treatment of coal and gas outbursts.
Innovation Solution
An integrated hole sealing device comprising a capsule plug, outer and inner capsules, a borehole water injection pipe, and a tapered plug, which forms a closed hollow cylindrical cavity, with a steel wire layer and valves for controlled water injection and expansion, and an explosive wire tube for protection during blasting, allowing for efficient sealing and water injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water-expanded capsule is used for hole sealing, then the sealing effect is improved, but the capsule is easily damaged during loosening blasting due to lack of front end protection
Solution Approach 1:
The device is divided into multiple functional segments: a protective front end structure, a capsule body, and a sealing section. The front end structure is separated from the capsule body, allowing independent optimization of each part's function - the front end provides protection while the capsule provides sealing capability.
Solution Approach 2:
The front end structure acts as a protective shield that absorbs and disperses blasting energy before it reaches the capsule body. This beforehand cushioning prevents direct damage to the capsule during loosening blasting operations.
2Reliability
If the capsule expands both laterally and longitudinally, then the sealing capability is improved, but the pipelines inside the capsule are easily broken
Solution Approach 1:
The pipeline is nested within the capsule structure in a telescopic configuration, allowing the pipeline to extend and contract with the capsule during expansion while maintaining its structural integrity. The pipeline is positioned and supported to accommodate lateral and longitudinal expansion without breaking.
Solution Approach 2:
The pipeline structure is designed to be dynamic rather than rigid, allowing it to adapt to the capsule's expansion movements. The telescopic design enables the pipeline to flex and move with the capsule during both lateral and longitudinal expansion phases.
3Device complexity
If yellow sand is used for sealing holes, then the method is simple, but the labor intensity is high and the sealing effect is unsatisfactory
Solution Approach 1:
The device uses hydraulic expansion through water injection to achieve capsule expansion and sealing. This replaces the manual labor-intensive yellow sand filling method with an automated hydraulic system that provides both simpler operation and superior sealing effectiveness.
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 integrated device effectively disperses blasting energy, prevents damage to the capsule, and ensures high operational efficiency by allowing for easy integration with blasting devices, providing effective hole sealing and water injection while protecting against coal and gas outbursts.
Implementation Method 1
each of the outer capsule and the inner capsule consists of a capsule outer sleeve, a steel wire layer and a capsule inner container
Implementation Method 2
suppress adsorption and desorption of gas through coal seam water injection
Implementation Method 3
injecting water into a capsule to expand the capsule
Implementation Method 4
The tapered plug disperses energy generated by loosening blasting to protect the capsule from being damaged by the loosening blasting
Implementation Method 5
A part, located in the hollow cylindrical cavity, of the borehole water injection pipe is telescopically wound on an outer side of the inner capsule
Data Source
AI summary
An integrated hole sealing, device includes a capsule plug, an outer capsule having a first hole site, an inner capsule having a second hole site, a capsule water injection pipe, a borehole water injection pipe and a tapered plug. Two ends of the outer capsule and the inner capsule are respectively fixed on the capsule plug and the tapered plug. The capsule plug, the tapered plug, the outer capsule and the inner capsule form a closed hollow cylindrical cavity. A middle part of the inner capsule is a hollow pipeline, and two ends thereof respectively correspond to the first and second hole sites. The borehole water injection pipe passes through the hollow cylindrical cavity. A part, located in the hollow cylindrical cavity, of the borehole water injection pipe is telescopically wound outside the inner capsule. The capsule water injection pipe passes through the capsule plug and extends into the hollow cylindrical cavity.