Borehole Charging Tube With Anchors and Backflow Valve
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Solution Overview
Problem
Existing explosive material charging devices face challenges in wet boreholes due to poor adhesion, leading to material flow-out, inexact charging, and safety hazards, and are time-consuming, inflexible, and not cost-effective.
Innovation Solution
An explosive material charging device with a top and bottom anchor unit, an expandable tube, and a backflow prevention valve, allowing secure engagement with the borehole wall, preventing material flow-out, and enabling precise and efficient charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional plugs and cartridges are used in wet boreholes, then explosive material can be held in the borehole, but the high water pressure causes the plug or cartridge to be pushed out and explosive material to flow out and splash
Solution Approach 1:
The patent employs a flexible membrane that separates the explosive material from the water-filled borehole environment. This membrane acts as a barrier that prevents water pressure from directly acting on the explosive material while allowing the system to accommodate the water pressure forces without failure
Solution Approach 2:
The flexible membrane serves as an intermediary element between the explosive material and the water pressure. It transfers and distributes the water pressure forces around the borehole while maintaining separation between the explosive material and water, preventing direct contact and potential failure
2Productivity
If conventional charging devices are used in wet boreholes with cracks and cavities, then charging operation can be performed, but poor adhesion causes explosive material to flow out and splash onto the crosscut floor
Solution Approach 1:
The flexible membrane creates a sealed environment that isolates the explosive material from water and prevents it from contacting the borehole walls where adhesion problems occur. This eliminates the adhesion issue entirely by removing the interface where poor bonding would occur
Solution Approach 2:
The membrane acts as an intermediary barrier that prevents direct contact between explosive material and water, thereby eliminating adhesion problems caused by water interference. It allows the explosive material to be contained without requiring adhesion to the borehole walls
3Ease of operation
If plugs and cartridges are pushed into wet boreholes, then explosive material can be charged, but the high water pressure building up affects the plug or cartridge with force from above together with the weight of the explosive material
Solution Approach 1:
The flexible membrane distributes the water pressure forces around the entire borehole circumference rather than concentrating them on a single plug or cartridge. This pressure distribution eliminates the net upward force that would otherwise push the charging device out of the borehole
Solution Approach 2:
The membrane serves as a pressure-distributing intermediary that equalizes water pressure forces around the borehole. It prevents concentrated force buildup on the charging device by spreading the load around the entire perimeter, eliminating the net force problem
4Productivity
If conventional charging methods are used in wet boreholes, then explosive material can be charged, but inexact amount of explosive material is used due to cracks or cavities in the borehole wall
Solution Approach 1:
The flexible membrane creates a defined, sealed chamber that precisely controls the volume available for explosive material. This sealed environment ensures that the correct amount of explosive material is contained regardless of borehole irregularities such as cracks or cavities
Solution Approach 2:
The membrane acts as a boundary definition intermediary that creates a precise charging volume. It separates the charging zone from the borehole irregularities, ensuring that the explosive material quantity is controlled by the membrane enclosure rather than by the irregular borehole geometry
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 ensures safe, precise, and efficient explosive material charging in wet boreholes, reducing safety risks and operational time, while being adaptable to various borehole configurations.
Implementation Method 1
a top anchor unit and a bottom anchor unit each configured to engage the borehole wall by means of radially outward extending resilient devices
Implementation Method 2
the bottom anchor unit comprises a backflow prevention valve device configured to prevent the explosive material to flow out from the expandable tube member
Implementation Method 3
an expandable tube member arranged between the top anchor unit and the bottom anchor unit and configured to be charged with explosive material
Data Source
AI summary
The present invention concerns an explosive material charging device and a method of positioning the explosive material charging device in a borehole. The explosive material charging device comprises a top anchor unit and a bottom anchor unit each configured to engage the borehole wall, an expandable tube member arranged between the top anchor unit and the bottom anchor unit and configured to be charged with explosive material, the bottom anchor unit comprises a backflow prevention valve device configured to prevent the explosive material to flow out from the expandable tube member, wherein the backflow prevention valve device is openable for permitting a charging hose to enter the expandable tube member for reaching the interior of the top anchor unit.