overburden drilling 1.efficient energy transfer 2.faster drilling speed 3.lower oil consumption 4.longer life,less failure
eccentric overburden drilling equipment:
1. 10 years manufacturing experience;
2. Certificate: ISO9001:2008
3. Material: Carbide
Eccentric Reamer System Step-by-step
1. When drilling starts, the reamer swings out and reams the pilot-hole wide enough for the casing tube to slide down behind the drill bit assembly.
2. When the required depth is reached, rotation is reversed carefully, whereupon the reamer swings in , allowing the drill bit assembly to be pulled up through the casing.
3. Casing tubes that are to be left in the drill hole should be sealed at the bottom of the hole by means of cement grout or some other sealing agent.
4. Drilling continues to the desired depth in the bedrock using a conventional drillstring.
NOD140 Eccentric Overburden Drilling Equipment
| 1 | Casing Tube | Maximum O.D.: 171mm Minimum I.D.: 155.6mm |
2 | Drill Pipe | Connection Thread: API2 3/8”Reg O.D.: 89mm Wrench Flats: 65mm | |
3 | Guide Sleeve | Effective length: 205mm | |
4 | DTH-Hammer | HD55, Cop54, SD5, DHD350R, QL50 | |
5 | Casing Shoe | L3=90mm L4=63mm D3=155.3mm D4=143mm | |
6 | Guide Device | L1=55mm L2=160mm D1=141mm D2=154mm | |
7 | Reamer | D5=138mm L5=69.5mm Reaming Diameter: 185mm Reamer has 7*14mm buttons | |
8 | Pilot Bit | D6=138mm L6=66.5mm Gauge button: 8*16mm Face button:8*14mm |
Technical Data
eccenetric overburden rock drill parts
