New Arrival China Core Drilling Machine - Dth hammer bit factory manufacturer supplier price for sale – TDS
New Arrival China Core Drilling Machine - Dth hammer bit factory manufacturer supplier price for sale – TDS Detail:
DTH (Down the hole) drilling is a rotary percussive drilling method. Hammer which is used for generating strong impacts is attached to the bottom of the drill string and a drill bit is attached to the lower end of the DTH hammer. The movement of the piston in the DTH hammer is caused by high pressure compressed air. The shock waves that travel to the bit are passed on to the rock mass through the cutting edges or carbide buttons on the bit. As a result, cracks are formed in the rock mass which results in formation of rock chips. Cuttings are removed from the hole by the air circulated from bottom to top to flush the hole.
| Model | Thread Connection | OD(mm) | Rec.Hole Size | Shank Style | Working Pressure(Bar) | 
| CD35 | API 2 3/8″ Reg | φ82mm | φ90-φ105 | 
DHD3.5
 CD35  | 
1.0-1.5Mpa | 
| CD45 | API 2 3/8″ Reg | φ99mm | φ110-φ135 | 
Cop44
 DHD340  | 
1.0-2.5Mpa | 
| CSD4 | API 2 3/8″ Reg | φ99mm | φ110-φ135 | 
SD4
 CSD4  | 
1.0-2.5Mpa | 
| CQL40 | API 2 3/8″ Reg | φ99mm | φ110-φ135 | 
QL40
 CQL40  | 
1.0-2.5Mpa | 
| CD55 | 
API 2 3/8″ Reg
 API 3 1/2″ Reg  | 
φ125mm | φ135-φ155 | 
Cop54
 DHD350R  | 
1.0-2.5Mpa | 
| CSD5 | API 3 1/2″ Reg | φ125mm | φ135-φ155 | 
SD5
 CSD5  | 
1.0-2.5Mpa | 
| CQL50 | API 3 1/2″ Reg | φ125mm | φ135-φ155 | 
Cop54
 QL50  | 
1.0-2.5Mpa | 
| CD65 | API 3 1/2″ Reg | φ148mm | φ155-φ190 | 
Cop64
 DHD360  | 
1.0-2.5Mpa | 
| CSD6 | API 3 1/2″ Reg | φ148mm | φ155-φ190 | 
SD6
 CSD6  | 
1.0-2.5Mpa | 
| CQL60 | API 3 1/2″ Reg | φ148mm | φ155-φ190 | 
Cop64
 QL60  | 
1.0-2.5Mpa | 
| CD85 | API 4 1/2″ Reg | φ185mm | φ195-φ254 | 
Cop84
 DHD380  | 
1.0-2.5Mpa | 
| CSD85 | API 4 1/2″ Reg | φ185mm | φ195-φ254 | 
SD8
 CSD8  | 
1.0-2.5Mpa | 
| CQL80 | API 4 1/2″ Reg | φ185mm | φ195-φ254 | 
QL80
 CQL80  | 
1.0-2.5Mpa | 
| CSD10 | 
API 4 1/2″ Reg
 API 5 1/2″ Reg  | 
φ225mm | φ254-φ311 | 
SD10
 CSD10  | 
1.0-2.5Mpa | 
| CN100 | API 6 5/8″ Reg | φ225mm | φ254-φ311 | 
NUMA100
 CN100  | 
1.0-2.5Mpa | 
| CSD12 | API 6 5/8″ Reg | φ275mm | φ305-φ445 | 
SD12
 CSD12  | 
1.0-2.5Mpa | 
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