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Adaptation Measures for Single-Arm and Double-Boom Rock Drilling Rigs in High-Dust Environments
Release time:
2026-09-04
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Summary:
During tunneling and mining operations, rock‑drilling rigs continuously operate in high‑dust environments. Dust ingress not only jeopardizes operator health but also accelerates wear of moving parts, clogs radiators, and causes electrical system malfunctions, severely limiting equipment lifespan and operational efficiency. Systematic adaptive measures are essential to ensure the reliable performance of rock‑drilling rigs under dusty working conditions.
I. Source Control of Drilling Dust: Wet Rock-Drilling Systems
Wet drilling is the core method for controlling dust generated during borehole excavation. In this technique, pressurized water is continuously injected through the central bore of the drill rod, creating a high‑pressure water mist at the bottom of the hole that wets the rock dust and suppresses its dispersion, achieving dust‑reduction rates of 75% to 90%. Simultaneously, the water flow carries rock cuttings out of the borehole, preventing dust accumulation that could cause bit jamming or hole blockage, while also providing continuous cooling to the drill bit and protecting the tool from damage caused by friction‑induced high temperatures.
During maintenance, operators should check the slag‑flushing water pressure at each shift. If the pressure is too low, effective atomization cannot be achieved; if it is too high, water may seep into the impact mechanism, accelerating component corrosion. Aging seals can cause flushing water to leak along the drill pipe instead of reaching the bottom of the hole. Wear of the water seal is one of the most common failure points in the water‑circulation system and should be replaced as a preventive measure.
II. Centralized Collection of Respirable Dust: Dry Dust-Removal Systems
For respirable dust that is difficult to fully capture in wet rock drilling, modern rock‑drilling rigs are typically equipped with dry dust collectors: negative pressure draws dust‑laden air from the drill hole into a cartridge‑type filter, and a pulse‑jet cleaning system periodically removes accumulated dust, ensuring that the dust concentration at the exhaust outlet complies with national standards.
Differential pressure is a key parameter for assessing the operating condition of a dust collector. Under normal operation, the differential pressure should remain stable within the range of 800 to 1,500 Pa. When the differential pressure consistently exceeds 2,000 Pa, it indicates that the filter cartridges are clogged with dust or that the cleaning system has malfunctioned, requiring prompt troubleshooting; conversely, an excessively low differential pressure may result from damaged filter cartridges or air leaks at the seals.
Daily maintenance should focus on the following aspects:
- Filter cartridge cleaning: Under high-dust conditions, it is recommended to clean the outer filter once daily by blowing air from the inside outward, maintaining a pressure of 0.4 to 0.6 MPa to prevent damage to the filter media caused by excessive pressure. For hard particulates, the pressure may be slightly increased to 0.6–0.7 MPa; for soft particulates, it should be appropriately reduced to 0.3–0.4 MPa.
- Seal inspection: Verify that the seal between the filter cartridge and the support plate is intact to prevent dust from bypassing the filter element and being discharged directly into the atmosphere.
- Pulse valves and solenoid valves: Regularly inspect the diaphragm for tears or air leaks, check the solenoid coil for overheating or burnout, and ensure there are no air leaks at the connection between the valve body and the air receiver.
- Compressed air quality: If the compressed air used for pulse-jet cleaning contains oil or moisture, it can corrode the diaphragm and form an oily sludge layer on the filter cartridge surface, accelerating caking and blockage. Therefore, the air receiver and piping should be regularly drained to remove oil and water.
III. Isolation and Protection for Operators: Sealed Pressurized Cab
Cabin enclosure and internal microenvironment control serve as critical safeguards for protecting operator health in high-dust environments.
Sealing is the foundation of dust protection. The cab must be fully enclosed to isolate it from external dust and noise, with in-cab noise levels kept below 75 dB. Building on this, pressurized cab technology incorporates active sealing: by supplying pre‑filtered air into the cab, a slight positive pressure higher than ambient outdoor pressure is maintained, effectively preventing dust from entering through gaps around doors and windows. For openings—such as those for wiring harnesses and pipelines—that pass through the cab floor, a modular sealing system should be employed to provide centralized, integrated sealing.
The fully enclosed cab is equipped with an air-conditioning system that filters fresh air while regulating indoor temperature and humidity, providing operators with a relatively stable working environment. The cab also meets FOPS/ROPS certification standards, ensuring safety protection even in dusty conditions. During routine inspections, pay close attention to the condition of the sealing strips and promptly replace any seals that have become deformed or cracked.
IV. Comprehensive Protection of Critical Systems
Hydraulic systems operating in dusty environments face heightened demands for sealing and cooling. The oil‑return filter element should be replaced according to the standard maintenance schedule—every 250 hours for the first service, then every 500 hours thereafter; in high‑dust conditions, the replacement interval should be further shortened. Regular oil sampling is required to monitor cleanliness, and the hydraulic fluid should be changed promptly if contamination levels exceed acceptable limits. The tank breather must be equipped with a high‑efficiency filtration element to prevent dust from entering the system through the breather port.
The cooling system should be cleaned weekly by blowing compressed air (or low-pressure water combined with a cleaning agent) in the reverse direction—from the inside to the outside—through the heat sink fins to remove accumulated dust and debris, thereby maintaining cooling efficiency.
All cable penetrations through walls in the electrical control cabinet shall be sealed. Desiccant packets may be placed inside the control cabinet and replaced regularly. In high‑dust environments, the frequency of electrical maintenance operations should be increased accordingly.
V. Tiered Maintenance System
Adaptive maintenance for rock‑drilling rigs under dusty operating conditions should be governed by a tiered implementation standard:
- Daily inspection: Check the pressure and flow rate of the slag‑cooling water, observe the status of the filter differential pressure indicator, and drain the air compressor and the gas storage tank via their drain valves.
- Weekly inspection: Use compressed air to back-blow the cooling fins, check and clean the air filter element differential pressure, and verify that the cab sealing strips are in good condition.
- Monthly inspection: Disassemble and inspect or replace the dust‑removal filter cartridge (replace ahead of schedule if the differential pressure exceeds 2,000 Pa or reaches the upper limit of 1,800 Pa); clean the hydraulic oil tank breather; and check the seals of all electrical control cabinets.
- Quarterly inspection: Collect hydraulic oil samples for contamination analysis, verify the cab pressurization system’s airflow and air pressure, inspect the cabin air filter, and replace periodic consumables such as the hydraulic return-line filter.
Through a systematic three-tiered protection system—source‑level dust suppression, centralized dust collection, and operator isolation—the rock‑drilling rig can maintain stable operational performance in high‑dust environments, ensuring construction continuity and safeguarding the occupational health of operators.
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