The hole drilling equipment is specially designed for efficient rock drilling in hard strata such as granite, limestone, and basalt. Equipped with a powerful diesel engine and hydraulic control system, the crawler chassis delivers excellent off-road performance, enabling flexible movement on mountain slopes, muddy mines, and rugged construction sites. Featuring a stable sealing structure and dustproof and high-temperature-resistant design, the machine supports long-hour continuous operation. With simple operation, low failure rate, and affordable spare parts cost, it becomes essential construction machinery for global mining, infrastructure, and geotechnical engineering projects. If you are interested, please contact Yugong Machinery immediately for more information.
Crawler Down the Hole Drilling Machine Parameters
| Main Specifications | YG 412B-1 | YG 416T-1 | YG 420B-1 | YG 420TA-1 |
| Feeding method | Hydraulic cylinder + chain | Hydraulic cylinder + chain | Hydraulic cylinder + chain | Hydraulic cylinder + chain |
| Feed total length | 4,600 mm | 5,500 mm | 5,500 mm | 5,880 mm |
| Feed extension | 800 mm | 970 mm | 970 mm | 970 mm |
| Feed travel length | 2,680 mm | 3,670 mm | 3,670 mm | 3,670 mm |
| Feed force max. | 15 kN | 15 kN | 15 kN | 20 kN |
| Feed speed max. | 16 m/s | 26 m/s | 26 m/s | 30 m/s |
| Pullback force max. | 25 kN | 25 kN | 25 kN | 45 kN |
| Hole range | Φ90-115 mm | Φ90-115 mm | Φ90-127 mm | Φ90-138 mm |
| Optimum hole depth | 21 m | 21 m | 21 m | 21 m |
| Drill pipe | Φ60 mm × 2 m | Φ60 mm × 3 m | Φ76 mm × 3 m | Φ76 mm × 3 m |
| Hammer | 3.5″ | 3.5″ | 4″ | 4″ |
| Rotation torque | 1,650 N·m | 2,200 N·m | 2,200 N·m | 3,200 N·m |
| Rotation speed | 100-220 rpm | 0-150 rpm | 0-150 rpm | 60-110 rpm |
| Fuel tank capacity | 115 L | 70 L | 70 L | 70 L |
| Tramming speed max. | 2.5 km/h | 2.5 km/h | 2.5 km/h | 3 km/h |
| Gradeability max. | 25° | 25° | 25° | 25° |
| Ground clearance | 310 mm | 310 mm | 310 mm | 310 mm |
| Track frame oscillation angle | / | ±10° | ±10° | ±10° |
| Traction force max. | 40 kN | 40 kN | 40 kN | 54 kN |
| Weight (w/o Options) | 3,950 | 4,620 | 4,620 | 5,500 |
| Dimensions (L×W×H) | 4,450×2,080×2,460 mm | 5,700×2,130×2,300 mm | 5,700×2,130×2,300 mm | 5,600×2,308×2,500 mm |
| Dust Collection | exist | exist | exist | exist |
6 Working Process for Down The Hole Drilling Rigs
The down-the-hole drilling rig is efficient hard rock downhole drilling equipment widely used in mining, road construction, and quarry projects. Its full working process is simple, stable, and highly mechanized.
- Site Positioning & Equipment Stabilization: Operators drive the crawler down the hole drilling machine to the preset drilling position. Adjust the support legs to level and fix the whole machine, preventing shaking or deviation during high-intensity rock drilling. Accurate positioning ensures standard borehole spacing and angle.
- Pre-operation Inspection & System Startup: Check air pressure, hydraulic system, and drill bit tightness. Start the diesel engine and air compressor to build stable air pressure. Test the rotation and feeding system to ensure all parts work normally before formal drilling.
- Rock Drilling & Impact Breaking: Lower the drill bit to touch the rock surface. The DTH hammer inside the hole uses high-pressure air to generate high-frequency impact force. Meanwhile, the rotary system drives the drill rod to rotate slowly. The dual effect of impact and rotation crushes the hard rock layer by layer.
- Air Discharge of Rock Slag: During drilling, continuous compressed air flows through the drill rod, blowing broken rock debris and dust out of the borehole. This automatic slag removal avoids hole blocking and ensures smooth and straight drilling.
- Rod Extension & Deep Drilling: When the first drill rod reaches the limit depth, the machine automatically stops feeding. Operators connect a new drill rod and continue drilling until the hole meets the designed depth.
- Hole Completion & Reset: After reaching the target depth, stop impact and rotation, lift the drill rod and hammer out of the hole. Retract the support legs and move the rig to the next drilling position to complete a full working cycle.
2 Real Customer Cases about YG Down Hole Drilling Equipment
Case 1: United States – Highway Slope Reinforcement Project
- Customer Background: The USA customer is an infrastructure contractor undertaking mountain highway renovation and slope anchor drilling projects. Facing hard rock geology and strict environmental requirements, the customer selected the YG 412B-1 crawler DTH drilling rig after comparing different DTH drilling equipment options.
- Difficulties:
- Hard rock formations required reliable drilling performance and suitable DTH tools.
- Scattered mountain sites required crawler mobility for frequent transfers.
- Slope drilling required suitable hole diameter, feed force, and equipment stability.
- Solution: We recommended the YG 412B-1, featuring a maximum hole diameter of 115 mm, an optimum hole depth of 21 m, a 3.5-inch hammer, a maximum feed force of 15 kN, a maximum pullback force of 25 kN, and a maximum tramming speed of 2.5 km/h. Its dimensions are 4,450 × 2,080 × 2,460 mm, and its weight without options is 3,950 kg. The rig also includes a dust collection system.
- Effect: The selected configuration provides a practical solution for drilling holes within the specified diameter and depth range. Crawler mobility supports movement between work areas, while the dust collection system helps manage drilling dust.
- Customer Feedback: “The crawler design makes moving between work areas convenient. The drilling specifications and dust collection system are important for our highway slope projects.”
Case 2: Saudi Arabia – Open-Pit Quarry Blasting Drilling Project
- Customer Background: The Saudi customer operates a quarry producing construction aggregates from hard rock. The project required a crawler DTH drilling rig suitable for routine blast-hole drilling.
- Difficulties:
- Hard rock required a suitable hammer and drilling configuration.
- Quarry blasting plans required holes within a specific diameter range.
- Dusty working conditions made dust collection and equipment maintenance important.
- Solution: We recommended the YG 420B-1 crawler DTH drilling rig. It supports a hole diameter range of 90–127 mm, an optimum hole depth of 21 m, and a 4-inch hammer. Key specifications include a maximum feed force of 15 kN, maximum pullback force of 25 kN, rotation torque of 2,200 N·m, and maximum tramming speed of 2.5 km/h. The rig weighs 4,620 kg without options and measures 5,700 × 2,130 × 2,300 mm. A dust collection system is also included.
- Effect: The 90–127 mm hole range and 4-inch hammer provide a defined configuration for suitable quarry drilling applications. Crawler mobility supports transfers around the quarry, while dust collection helps manage dust during drilling.
- Customer Feedback: “The YG 420B-1 offers a practical combination of drilling capacity, crawler mobility, and dust collection for our quarry work. Its specifications make it easier to assess whether the rig matches our blasting requirements.”
6 FAQs about YG Down Hole Drilling Equipment
A: 21m.
A: This professional down-the-hole drilling equipment is specially designed for hard rock such as granite, basalt, and limestone. It is widely used for blast holes, anchor holes and water well drilling in mining and road projects.
A: Yes. The machine adopts an integrated hydraulic control system with simple buttons. One operator can complete positioning, drilling, and rod replacement after simple training, saving labor costs.
A: Yes. We provide global technical support, a long-term warranty, and a complete supply of drill bits, hammers, and other vulnerable parts, ensuring worry-free operation for overseas users.
A: Absolutely. We support dust removal system upgrades, power matching, and structural reinforcement customization according to local geology and climate.
A: The main differences are their drill pipe size, hammer size, hole diameter range, and rotation torque.
YG 412B-1: Φ90–115 mm hole range, 3.5-inch hammer, Φ60 × 2 m drill pipe, and 1,650 N·m rotation torque.
YG 420B-1: Φ90–127 mm hole range, 4-inch hammer, Φ76 × 3 m drill pipe, and 2,200 N·m rotation torque.
Factory Direct Downhole Drilling Equipment-Choose YG Machinery
If you are looking for durable, high-efficiency downhole drilling equipment with competitive DTH drilling machine prices, YG industrial-grade downhole drilling machine and downhole drilling rig are your ideal choices. Suitable for highway construction, quarry mining, and slope engineering, our equipment helps you reduce failure rates, improve productivity, and maximize project profits! If you are interested, please contact YG for a discount.
