Efficient Deep Hole Excavation in Hard Rock
Deep hole pre-splitting operations in f6-f20 hard rock formations present significant challenges for traditional construction equipment. Drilling Rigs modified with Excavator Converted Drilling Rigs (ECDs) generally suffer from insufficient guidance accuracy, with hole diameter deviations often exceeding the project's permitted value by 2%. Ultra-high pressure Rock Splitters, while capable of rock fracture, suffer from significant randomness in hole positioning and uncontrollable drilling quality. Conventional Down-The-Hole Drilling Rigs often experience a sudden drop in penetration rate and abnormal tool wear when drilling in formations above f18.
This hard rock down-the-hole drill rig achieves breakthroughs through three key technological innovations:
Core Technical Features
① A closed-loop hydraulic servo feed system detects rock property changes in real time and automatically adjusts impact energy.
② A drill pipe system equipped with a hydraulically cushioned drill adapter extends drill tool life by 200% compared to traditional down-the-hole drilling rigs.
③ A modular power adapter interface is compatible with the Excavator Converted Drilling Rigs platform and Ultra-high-pressure Rock Splitters auxiliary rock breaking devices.
Verified by the National Geotechnical Engineering Equipment Testing Center:
1. Continuous drilling efficiency reaches 1.8 m/min in F20 granite.
2. Ø127 mm hole diameter deviation is controlled within 0.5%.
3. 42% reduction in drilling cost per meter compared to imported down-the-hole drilling rigs.
Standard Maintenance Procedures
① Check hydraulic oil contamination every 50 hours (NAS level 7 or below).
② Check the flatness of the drill adapter end face every 20 meters (tolerance ≤ 0.02mm).
③ Do not forcefully disassemble the drill rod while it is still cool.
(A granite mine successfully converted the drill rig into a pre-splitting directional blasting device, achieving a charge positioning accuracy of ±5cm.)
Engineering Application Examples
In a quartzite pre-splitting blasting project, compared to traditional excavator converted drilling rigs, single-cycle drilling time was reduced by 58% and overbreak by 76%. For layered rock masses difficult to handle with ultra-high-pressure rock splitters, this equipment achieves precise contour shaping, increasing the half-hole retention rate to 91%.
Jiangsu Aneng Drilling Equipment Technology Co., Ltd.
