ZEGA D470A DTH blasthole drilling rig
Three main types of holes are drilled in surface mining
1. Blast holes
Hole diameter 115 – 229 mm (4½ – 9 in)
Hole depth 6 – 20 m (18 – 60 ft)
− Blast holes are production holes and will be filled with explosives
− Drilling accuracy is important to obtain good and even distribution of the explosives in the rock
− This will optimize fragmentation and facilitate further handling such as mucking, hauling and crushing
2.Buffer holes
Hole diameter 115 – 152 mm (4½ – 6 in)
Hole depth 6 – 20 m (18 – 60 ft)
3.Perimeter holes (pre-split)
Hole diameter 115 – 152 mm (4½ – 6 in)
Hole depth 6 – 20 m (18 – 60 ft)
− Pre-split and buffer holes are used for wall control
− This method reduces the amount of waist rock excavation and also the risk of rock fall from pit walls
− Usually smaller hole diameter than blast holes to carry less explosives
Technical parameter
| Model | ZEGA D470A | Hole range | Φ138 - 165 mm |
| Suitable DTH hammer sizes | 5 inch | Drill pipe handling capacity | 4+1 |
| Drill pipe outer diameter | Φ114 mm | Drill pipe length | 7m |
| Hole depth | 35m | Rotation speed | 0-105 rpm |
| Max. torque | 4310 N.m | Rod handling | 4+1 |
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Engine |
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| Engine model | Caterpillar C11 | Rated power | 287 kw |
| Emission standard | Tier IIIA | Fuel tank capacity | 600L |
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Air compressor- Zega |
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| Maximum working pressure | 24 bar | Rated F.A.D | 20 m³/min(706cfm) |
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Feed beam |
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| Hydraulic motor | Hydraulic cylinder +steel wire | Feed length | 9100 mm |
| Travel length | 6500 mm | Feed extension | 1300 mm |
| Maximum feeding rate | 0.88m/s | Max. Feed force | 34.5KN |
| Max pull up force | 67.6 KN | Tramming speed | 3km/h |
| Traction force | 117.7 KN | Hill climbing ability | 25° |
| Track frame oscillation angle | 士10° | Ground clearance | 420 mm |
| Weight | 23000 kg | Dimension | 11280*2500*3530 mm |
Application
Quarrying aggregate – limestone
Application demands
− A wide spread of customers in this application, from small quarries serviced by contract drillers to big operations with own personnel and equipment
Blast hole drilling
Hole diameter 90 – 205 mm (3½” – 8”)
Hole depth 10 – 30m
− Many quarries are located close to urban areas and environmental regulations put restrictions on drilling parameters
− Hole accuracy is important
− Noise restrictions give DTH drilling an advantage
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