HF-44A economic core drilling rig 

I.  General

HF-44A  Core  Drill,  a  new  type  of  product  with enhanced  capacity,  is  a  kind  of  hydraulic-driven, spindle, diamond-bit, small-diameter core drill with fairly powerful  drilling  force. It is mainly  suitable for exploration  of metal or non-metal solid mineral ore  bed.  It  is  widely  applied  in  core  drill  with diamond  bit  or  hard  tungsten-carbide-tipped   bit and diamond bit in the field of geology, metallurgy, coal mine, hydrological  and engineering  drilling. It can  also  be  used  in  the  fields  of  superficial-zone

petroleum  and  natural  gas  mining,  mine  workings  ventilation  and  water  discharge  tunnel  drilling  as  well  as foundation  pile  construction  in  large  diameter.  It  is  in  reasonable  structure,  light  weight,  powerful  capacity, multiuse, steady performance, high responsibility and high standardization and generalization.

1)   Core Drilling

2. Drilling Angel ~0 to 360°

4. Rotator

Type: Feeding with double oil cylinders hydraulic pressure, rotating mechanically. Spindle I.D~93   mm (3.66 inch)

Speed of spindle:

Max. torque of spindle~3.2  KN·m (2358 lbf·ft)

Spindle stroke~600   mm (23.62 inch)

Max. lifting force of spindle ~120  KN (26976 lbf)

Max. thrust of spindle~90   KN (20232 lbf)

5. Hoist 

Form planetary gearing

Wire rope dia~17.5 mm(0.69 inch) or 18.5 mm(0.73 inch)

Drum capacity for rope(170 kg/mm2  equivalent to 241839 lb/inch2) ~ (17.5mm steel wire rope)    110m(360.8 feet)

(18.5mm steel wire rope)     90m(295.2 feet) Max. lifting force (single rope)~45 KN (10116 lbf)

Lifting speed of the wire rope

Power eng speed 1000r/min 0.47; 0.86; 1.22; 1.78 m/s (1.54; 2.82; 4.00; 5.84 feet/s) Power eng speed 1500r/min     0.70; 1.29; 1.84; 2.68 m/s (2.30; 4.23; 5.90; 8.79 feet/s) Power eng speed 1700r/min       0.805; 1.485; 2.12; 3.08 m/s (2.64; 4.87; 6.95; 10.10 feet/s) 

6. Clutch

Form: Dry single chip friction clutch

7. Gearbox

Form: sliding gearbox (4 speeds are positive and 1 is negative).

8. Oil Pump

Form: Single Gear Pump

Displacement        ~32+12  L/min (8.5+3.2 US Gallons/min)

Working pressure    ~0 to 8  MPa (0~1160 psi)

Max. pressure    ~12  MPa (1740 psi)

9. Water Brake

Working speed (r/min) ~700-800

Single rope compensational speed~3--8  m/s (9.84--26.2 feet/s)

Single rope compensational load~45  KN (10116 lbf)

10. Drill Frame

Form sliding skids type (with sliding base)

Drill backward stroke   ~460  mm (18.11 inch)

11. Dimensions (L×W×H) ~3030×1100×1890   mm (119.3×43.3×74.4 inch)

12. Weight of drill (without power unit) ~about 2150 kg(4741 lb)

13. Max. weight of dischargeable apparatus ~300 kg (662 lb)