Rotary drilling rig SBSH-250D (with the diesel drive) : The drilling equipment

The diesel engine Cummins QSK19 with 650h.p. capacity is notable for its low fuel consumption and efficiency. In-line arrangement of the compressor, the engine and the pumping unit make the servicing of these parts easier. The fuel tank of 2,5 m³ provides a 24-hour non-stop operation of the drill. The traveling of the rig, its leveling, lifting and lowering of the mast, the drill tool feed and its rotation as well as screwing of the rods is performed by the hydraulic drive.

The hydraulic drive based on the mobile Bosch Rexroth hydraulics provides highly reliable work of the drill, smoothness of operations, eliminated hydroshocks, reduction of noise and vibration and precision in operations regulation. Capacity of the regulated pumps is set automatically by the feedback system and depends on the speed of the performed operations which is set by the distributor with proportional control. The hydraulic drive has an idle mode which allows to keep the hydraulic system in stable temperatures of instant readiness. This mode has proved to be valuable in freezing winter conditions. When all hydraulic operations are switched off, the pumps are set at a minimal working capacity to pump 10-15 l/min of the power oil through the block of hydraulic system.

Upon customer’s request the drilling rig can be equipped with the compressor of 28m³/min or 40m³/min capacity depending on the diameter of drilling.

Rational arrangement of the main units of the drill provides stability of the machine during drilling or traveling.

The mast frame is of closed type with spacer blocks. The strengthened design of the anchor bar that holds the mast swing cylinders provides durability and reliability of the mast at the thrust force of 35 tons and the torque of 1300 kgm.

The cable-reel feed drive system (with two hydraulic cylinders) of the drill tool damps down bumps and vibrations when drilling fractured rocks.

The supporting and the rotating units are separated. This is done to protect the rotating unit from bumps and vibrations.

The cabin has been enlarged. It has a window heater, insulation of walls, floor and ceiling. The cabin has a wooden floor with rubber covering, an air heater and an air conditioner.

There is also an anti-vibration chair, two control panels with an indicators block showing the main drilling parameters like the depth of drilling, the speed of sinking, spindle rotation frequency and etc. This simplifies the drill operation and increases comfort of the operator.

TECHNICAL CHARACTERISTICS

Тype of drill	SBSH of rotary type
Temperature conditions	from -40⁰С up to +50⁰С
Rock hardness according to prof. Protodyakonov scale	6…….20
Hole diameter, nominal, mm	200……270
Rod length, m	9,85
Number of rods, items.	4(3 in a separator)
Max. depth of drilling, m	37
Incline of the hole to the vertical, degree.	0-30 (or every 5 degrees).
Feed drive system	Two hydraulic cylinders, 4-fold cable-reel system
Max. feed thrust, tf.	Up to 35
Speed of drill tool thrust when drilling, m/min	Continuously variable from 0 to 6
Max. speed of drill tool thrust, m/min: - lifting - lowering	32 25
Max. drill tool rotation frequency, rpmin	Continuously variable from 0 to 150
Max. torque on the bit, kgf*m	1300
Rotation unit drive	Two hydraulic motors by Bosch Rexroth
Dust suppression	wet, dry (at your choice)
Type of engine	Diesel engine QSK19 Cummins
Engine capacity, kW (h.p.)	485 (650)
Nominal rotation frequency, rpmin	1800
Type of fuel	Diesel fuel according to GOST 305-82 (Russian State Standard)
Specific fuel consumption, l/kW*h	0,24
Hourly average fuel consumption at optimal loading of the engine, l	65
Operating capacity of fuel tank, l	2500
Тype of the coolant in the engine cooling system	Tosol-А40М (Tosol-А65М)
Volume of the coolant in the cooling system , l.	390
Prestart warm up of the engine and compressor	heaters «Eberspecher»
Electronic control and monitoring of the engine	Electronic module ECM of the engine
Compressor capacity, m³/min	28; 40 (at your choice)
Compressed air pressure (excess), MPa (kgf/sm²)	0,7 (7)
Compressor air end	By leading manufacturers
Compressor drive	From the engine to the clutch “Stromag”
Electronic control and monitoring of the compressor	Compressor controller
Type of the pumps	Pumping unit by Bosch Rexroth includes : - 2 regulated axial-piston pumps with a tilted block; - 2 regulated axial-piston pumps with a wabble plate
Pump drive	From the engine through the clutch “Stromag”
Drive of the engine cooling fans, the compressor, the hydraulics and of the dust suppressing system	Axial-piston hydraulic motors by Bosch Rexroth
Drive of the crawler-mounting system	Two regulated axial-piston hydraulic motors by Bosch Rexroth with the charge-and-safety brake valves
Control switch gear	Section blocks by Bosch Rexroth with LS-control of М4 type
Max. operating pressure, kgf/sm²	250
Type of power fluid	Mineral oil of multigrade low-temperature hydraulic type
Filtration of power fluid	Filters «МР FILTRI» - pressure filter (filtering degree- 10 micron); -discharge filter (filtering degree- 10 micron); -intake filter (filtering degree — 25 micron).
Mounting of the drill	Crawler mounting
Traveling speed	Up to 2,5 -regulated
Max. grade-ability of the traveling drill, degrees.	12
Number of leveling jacks, items	3
Length of jack stroke, mm	1000
Heating of the water tank (for wet dust suppression)	Torch heater
Heating of the cabin	Air heater by Eberspecher
Air conditioner	On-roof air conditioner by Webasto
Overall dimensions of the drilling rig, m with the mast up: -length -width -height with the mast down: -length -height	10,5 5,7 18,4 17,8 6,6
Mass, kg	90 000

Additional equipment by request. Available options.

Centralized Lincoln lubrication;
Automatic fire extinguishing system;
Automated data collecting system;
Welding generator;
Nominal hole diameter of 311 mm (by 3 rods, depth of drilling- 27m);
Length of the drilling rod -11,4 m (depth of drilling - 43m);
Length of jack stroke - 1200mm

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Rotary drilling rig SBSH-250D (with the diesel drive)

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