1.
General presentation
2. Working principle
1. General presentation
Application
•The Hydrastar 200 is designed for rock bolting in hard rock with
Sandvik bolters.
•It’s also suitable for tunneling and mine devellopment drilling with
Sandvik Narrow vein mining jumbos.
1. General presentation
Main Characteristics
•Compact design of the Hydrastar 200 hydraulic percussive rock drill
when mounted on the TU-C bolting heads.
•Excellent ability to install bolts wherever it is need to, even in real
uneven conditions.
•The power level perfectly fitted to the application enables an
outstanding lifetime to the drilling tools.
•Biodegradable oils can be used both in hydraulic and in shank
lubrication to reduce risk of environment.
1. General presentation
1. Pressure accumulator
2. Rotation mecanism
3. Percussion mecanism
4. Flushing head
1. General presentation
Main Specifications
• Hole diameter: Bolting 27 45 mm
Drifting 35 41 mm
• Power class: 10 kW
• Percussion rate: 40 - 65 Hz (according to percussion
pressure)
• Operating pressure:
Percussion 140 - 200 bar
Rotation (max) 210 bar
• Rotation motor type: OMS 125
1. General presentation
Rock Tools
• Drill steels
– Bolting H25 - H28 drifter rods
H22 - H25 integral rods
– Drifting H25 - H28 drifter rods
• Shanks
– Bolting Female R25-R28-R32
– Drifting Male R32-R38
1. General presentation
Main Dimension
• Length: 765
mm
• Profile height: 152 mm
• Width: 297 mm
• Weight: 95 kg
1. General presentation
Rotation Mecanism
• Motor Orbit: OMS 125
• Torque (at 210 bar): 420 Nm
• Rotation speed: 0...280 rpm
• Flow (at max speed): 40 l/min
1. General presentation
Percussion Mecanism
• Operating pressure: 140 - 200 bar
• Percussion power: 6 - 10 kW
• Percussion rate: 40 - 65 Hz
• Flow: 60 l/min
1. General presentation
Accumulator
• Accumulator: gas Nitrogen N2
• Inflating pressure: 55 bar
• Filling valve: Vg8 DIN 7756
1. General presentation
Flushing
• Max pressure (air/water): 15 bar
1. General presentation
Shank Lubrication
• Air flow (at 6 bar): 250 l/min
• Pressure: 2.5 bar
• Oil consumption: 100 g/h
1. General presentation
Oil Recommendations
• Oil operating temperature: +40...+65° C
• Oil Type:
Shell Tellus S68 (Ambient temperature between 0 °C and +30 °C)
Shell Tellus S100 (Ambient temperature above +30 °C)
2. Working principle
Hydraulic law
Liquid transmit applied pressure in all directions and act with equal force
on all equal areas and at right angles to them.
Force = Pressure x Area
Force: daN (10 daN = 1kg), pressure: bar, Area: cm²
2. Working principle
Hydraulic law
F1 s
1
F2 s
2
p
s1>s2
p x s1 = F1 p x s2 =
F2
F1>F2
2. Working principle
Shuttle valve
p1 p2
s1 s2
M
2. Working principle
From the drilling regulation block,
the percussion pressure is always
directed to the front chamber of the
percussion mecanism, the shuttle
valve and the accumulator.
The shuttle valve allows the rear
chamber to be alternatively
pressurized by the percussion flow
then connected to the return line.
2. Working principle
The piston reaches the impact
point, the pressure within the
pilot channel can be release to
the return due to the groove of
the piston.
The pressure is applied now only
ot the smallest pilot chamber of
the shuttle valve. This will move
in the position shown allowing
the rear chamber of the piston to
be connected to the return.
THE PISTON WILL START THE
REVERSE MOTION
2. Working principle
When the piston reaches
the rear position, the high
pressure from front
chamber flows into the pilot
channel.
Both pilot chambers of the
shuttle valve are now
pressurized. But as the
pilot chamber is the largest,
the valve will move in the
position shown.
The rear chamber of the
piston is pressurized. The
rear chamber is larger than
the front one.
THE PISTON STARTS TO
MOVE FORWARD
2. Working principle
Purpose of the accumulator
The accumulator store energy during the reverse motion.
This energy will be supplied to the percussion mecanism at the end of the forward motion to achieve the
highest speed at the impact point.
While the drifter is working, the percussion flow needed varies according to the position of the piston .
The accumulator absorbs the flow surges.
By keeping the accumulator in good working order, you prevent the hoses vibrations and poor drilling
performance.
2. Working principle
Shuttle valve principle
From the pressure inlet groove, the pressure hole allows oil to flow to each ends of the shuttle valve.
The high pressure is therefor always applied on both sides of the spool on diameter D1 and D2.
The pilot area is alternatively pressurized then connected to the return. When it is pressurized the
whole diameter D3 is pressurized (area D1 + the ring area of the pilot area).
2. Working principle
The motion of the valve can be explained by this chart:
2. Working principle
End of Reverse position
2. Working principle
Impact point
2. Working principle
Detail of the pilot channel
As show on this drawing,
when moving in reverse,
the front piston groove
allow H.P. oil to flow into
the pilot channel
2. Working principle
Drawing A : Long stoke
The piston moved in reverse, the pilot channel is pressurized when the piston reaches the
position shown. The piston move to its maximun rear position.
2. Working principle
Drawing B : medium stoke
The screw 2 has been removed. The pilot channel is pressurized sooner. The piston stroke is
reduced (lower impact energy / Higher frequency).
2. Working principle
Drawing C : short stoke
The screw 1 has been removed. The pilot channel is now pressurized at the shortest stroke
of the piston. Note: installing or not the screw 2 has no influence.
2. Working principle
2. Working principle
Rotation mecanism
2. Working principle
Rotation mecanism
The rotation mecanism consist of an hydraulic motor which runs the driver gear. The driver gear is coupled to
the main gear which runs the shank adaptor throught the bronze driver.
All moving parts are lubricated by the hydraulic oil. The drain flow from the hydraulic motor is directed to the
rotation housing. A calibrated jet is connected to the rotation return line R. This increases the drain flow for
better cooling efficiency.
NEVER CONNECT THE INLET PRESSURE TO THE ROTATION PORT R.
The driver gear is guided by two bronze bushings.
The two bushings which guide the maingear are made by steel with a deposit of bronze. One lip seal is
installed on each bushing.
