Heavy-duty SANY SR250 Rotary Drilling Rig

250kN · m full force, stronger than 220 when entering the rock

Rated at 250kN · m, dual speed of 7-26rpm, suitable for direct drying in moderately weathered, hard rock, and thick gravel layers. It is easy, efficient, and does not hold up traffic for 220 laborious tasks;
Engine: Caterpillar C9 (300kW/408 horsepower) or Mitsubishi 6D24-TL (250kW), with sufficient power reserve, stable performance at high/low temperatures, controllable fuel consumption, and durability.

70 meter deep hole, 2.3-meter large hole, 74 ton stabilizer

The maximum aperture is 2.3 meters, the maximum depth is 70 meters (friction rod)/54 meters (machine lock rod), which is 4 meters deeper than 220 meters and stronger in rock penetration;
The whole machine weighs 71-74 tons, with a track width of 4.3 meters and reinforced mast. The 60-70 meter deep hole has stable verticality, no shaking, and good hole quality.

220 price, 280 activity, full cost-effectiveness

Compared to 220C: torque+30, depth+4, rock penetration strength, 100-200 higher bench shift;
Compared to 280, it is 15 tons lighter, cheaper, fuel-efficient, and saves on transportation costs during transit. It is easy to pick up and has fast cost recovery;
Suitable for: high-rise buildings, bridges, subways, deep foundations, hard rocks, insufficient 220, and wasteful 280.

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