Dry Drilling Dust Extraction with Rotary Lobe Blower
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Solution Overview
Problem
Existing dry drilling devices for underground mining face challenges in reliably collecting dust and drill cuttings due to inefficient vacuum generators, complex baffle systems, and inadequate filter designs, leading to disruptions in drilling operations and safety concerns, especially in large and longer boreholes.
Innovation Solution
A dedusting device equipped with a rotary piston blower or vacuum pump as a stable vacuum generator, a surface filter with compact elements and a baffle wall coated with rubber or plastic for effective separation and protection, and a cyclone for pre-separation of coarse drill cuttings, ensuring consistent suction and separation of drill cuttings and dust regardless of accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If radial fans are used as vacuum generators, then the device structure is simple, but the volume flow rate cannot be maintained as pressure drop increases
Solution Approach 1:
The patent changes the operating parameters of the vacuum generator by using a rotary lobe blower instead of a radial fan. The rotary lobe blower maintains a more favorable pressure curve that preserves volume flow rate even as pressure drop increases, directly resolving the contradiction between structural simplicity and productivity stability.
2Manufacturing precision
If a baffle plate system is used for separation, then coarse material can be separated, but the system becomes complex and the drill cuttings are crushed
Solution Approach 1:
The patent extracts the separation function from the complex baffle plate system and concentrates it into a single cyclone separator. The cyclone efficiently separates drill cuttings from dust and air without the need for multiple baffle plates, reducing device complexity while maintaining separation effectiveness and avoiding drill cutting crushing.
3Productivity
If the suction bell size is increased to improve capture efficiency, then more dust and drill cuttings can be captured, but the device becomes larger and less suitable for underground use
Solution Approach 1:
The patent changes the operational parameters by using a rotary lobe blower that maintains high volume flow rates. This allows the use of a compact suction bell size while still achieving high capture efficiency, as the vacuum generator compensates for the smaller bell area with superior flow characteristics.
4Manufacturing precision
If bag filters are used for dust filtration, then dust can be separated, but the filters are difficult to clean
Solution Approach 1:
The patent replaces the difficult-to-clean bag filters with disposable cartridge filters. These cartridge filters can be easily removed and replaced without complex cleaning procedures, significantly improving ease of maintenance while maintaining effective dust separation capabilities.
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 reliable and efficient removal of drill cuttings and dust, maintaining consistent drilling operations with reduced noise and extended maintenance intervals, ensuring safety and hygiene by separating coarse materials effectively and protecting filter elements from damage.
Implementation Method 1
Radial fans serve as vacuum generators, creating the necessary negative pressure to flush drill cuttings and dust out through the gap between the drill string and the borehole wall
Implementation Method 2
Dust separation via the cyclone, which is also used in the generally accepted state of the art
Implementation Method 3
the dust filter is designed to precipitate both the dust and the drill cuttings from the volume flow
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
The invention relates to a device for dry drilling using drilling debris flushing and dust extraction, which is suitable for use in a drilling rig having one or especially also a plurality of drilling trucks, wherein each drilling truck having a dust extraction means and drilling debris collector (2') is assigned a vacuum generator (3) that is stable with regard to volume flow, especially in the form of rotary piston blowers (10, 11, 12), and a surface filter (4, 4', 4") having compact elements (5, 6) and serving as a dust filter (2) and drilling debris collector (2'). The surface filter (4) is designed in such a manner that said filter reliably separates both the drilling debris and the dust.