S03 Accumulator

8/12/2019 S03 Accumulator

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D 28160--8 en 0905 / PIR

PRESSURE ACCUMULATOR FOR HYDRAULIC ROCK DRILL

Repair instructions

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2005 SANDVIK TAMROCK CORP., Tampere PlantP.O.Box 100FIN--33311 TAMPERE, FinlandTel. +358 205 44 121Telefax +358 205 44 120

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CONTENTS

1. GENERAL 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. CHECKING THE FILLING GAS PRESSURE 3. . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. REMOVING THE PRESSURE ACCUMULATOR FROM THE ROCK DRILL 3.

4. DISMANTLING THE PRESSURE ACCUMULATOR 4. . . . . . . . . . . . . . . . . . . . . .

5. CHECKING THE PRESSURE ACCUMULATOR 4. . . . . . . . . . . . . . . . . . . . . . . . .

6. ASSEMBLY 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7. FILLING 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7.1. Filling device of pressure accumulators 7. . . . . . . . . . . . . . . . . . . . . . . .

7.2. Filling instruction 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7.3. Filling pressures of accumulators 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7.3.1. Low pressure accumulator (LP) 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7.3.2. High pressure accumulator (HP) 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7.3.3. Pressure of stabilizer accumulator 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8. MOUNTING THE PRESSURE ACCUMULATOR ON THE ROCK DRILL 11. . . .


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1. GENERAL

As in all hydraulic machinery so also in hydraulic drill rigs cleanness is the most importantconsideration if trouble--free operation is to be ensured. We therefore recommend that allmaintenance work of the accumulators is done in a clean and dustless room.

The condition of pressure accumulator should be checked always when the accumulatoris dismantled and when the rock drill is overhauled. The rock drill special tool set includesall the tools needed in maintenance and checking the accumulators.

Experiences have shown that the first (originally fitted) accumulator diaphragm does notreach the normal service life, particularly if the time interval between the pressurizationand taking into use is long. For this reason the accumulators supplied as spares areunpressurized. There is a note of this on the accumulator.

The accumulator bottom and cover should always be kept as a pair. Tamrock suppliescovers and bottoms only as a pair; other parts such as diaphragms and filling valves canbe obtained separately.

Only qualified service personnel may service the pressureaccumulators. The following instructions must be strictly observed;failure to do so may cause a danger of accident.

Before removing the accumulator from the rock drill, discharge theaccumulator pressure by opening the filling valve.

Repair of a pressure accumulator by welding or by other means is strictlyforbidden.

While using the gauge, the pressure relief hole must always be pointedto the opposite direction from any persons close by to avoid personalinjures in case the sudden pressure discharge.

WARNING

WARNING

WARNING

WARNING


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2. CHECKING THE FILLING GAS PRESSURE

Check the accumulator filling gas pressure once a week. The rock drill special tool setincludes two pressure gauges for this purpose: one gauge with the scale 0...100 bar forthe high pressure accumulator, and the other with the scale 0...10 bar for the low pressureaccumulator.

a b

1. Remove the cap (a).

2. Screw the pressure gauge to the filling valve.3. Undo the lock nut (b).

4. Wait until the needle of the gauge stops and then read the gauge indication.

5. Close the lock nut (b).

6. Unscrew the gauge from the filling valve and fit the cap (a) in place.

3. REMOVING THE PRESSURE ACCUMULATOR FROM THE ROCKDRILL

Pressure accumulator can be changed without demounting the rock drill from the feed.If you for some reason cannot immediately install a new accumulator, must the open oilchannels be covered thoroughly with eg. plastic plugs.

1. Discharge the accumulator pressure by opening the filling valve!

2. Undo the accumulator bolts (wrench size 24 mm).

Do not start the hydraulic power pack if an accumulator is not in place inthe rock drill.

WARNING


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4. DISMANTLING THE PRESSURE ACCUMULATOR

Before dismantling the accumulator, be sure it has no pressure.

1

2

1. Fasten the assembly stand (1) in the vice, and place the accumulator in the standwith the bottom upwards.

2. The same number appears both on the accumulators cover as well as on thebottom. The cover and the bottom must remain paired.

3. Make sure that the filling valve is open!

4. Open the accumulator bottom with the opener (2).

5. CHECKING THE PRESSURE ACCUMULATOR

1. Check the accumulator visually for wear, damage, corrosion, etc.

2. Clean and check the threads carefully.

If the threads are badly corroded or worn, the accumulator must bescrapped!

WARNING

WARNING


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6. ASSEMBLY

a

b

b

20 Nm 40 Nm secure with glue

b

10 Nm

b

1. Fit a new or inspected diaphragm in the cover. Make sure that the diaphragm isin the groove and fitted the right way down.

2. Lubricate the surface (a) with vaseline or lanolin.


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Check that the number on the cover and the bottom is the same.

D The high pressure accumulator is marked with uneven numbers and the lowpressure accumulator with even numbers.

HP LP

3. Lubricate the threads of the bottom with vaseline or lanolin.

4. Screw the bottom all the way in and tighten it with the special tool to a torque of150 Nm.

D

When the pressure accumulator diaphragm is changed, the O--rings (b) shouldalso be changed.

Check the wear limit marks of the threads always after tightening (150 Nm) of the bottom.If the mark (I) in the bottom remains after the tightening between the dot(S) and the mark(R) in the cover, the thread is in order.

If the mark (I) in the bottom goes beyond the mark (R), are the threads of the accumulatorcover and bottom too much worn. Replace the accumulator and discard the old one.

A worn--out or damaged pressure accumulator must be discardedimmediately.

WARNING

WARNING


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7. FILLING

The only allowable filling gas is nitrogen (N2).

Do not fill an unchecked or a too worn accumulator.

D You can refill the accumulator while mounted to the rock drill.

7.1. Pressure accumulator filling device

N21413,14 151011

12 9 8 7 6 5 3 2

1. Accumulator body

2. Filling valve

3. Locking nut

4. Cap

5. Quick coupling stem

6. Quick coupling sleeve

7. Hose

8. Accumulator pressure gauge

9. Gas bottle pressure gauge

10. Pressure reducing valve

11. Pressure regulating valve

12. Shut--off valve

13. Adapter

14. Seal15. Elbow adapter

WARNING

WARNING


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7.2. Filling instruction

1. Remove the cap (4).

2. Screw the elbow adapter (15) to the filling valve (2).

3. Push the quick coupling sleeve (6) onto the stem (5).

4. Undo the locking nut (3).

5. Turn the pressure regulating valve (11) open.

6. Open the nitrogen bottle valve (12). The gauge (9) indicates the pressure in thebottle.

7. Adjust the pressure in the low pressure accumulator to 5 -- 10 bar by turning theregulating valve (11). Gauge (8) indicates the pressure in the accumulator.

8. Adjust the pressure in the H.P. accumulator with the pressure control valve (11),according to the instructions. Gauge (8) indicates the pressure in the accumulator.Max. pressure is marked on the accumulator.

9. Adjust the pressure of the stabilizer accumulator with the pressure control valve,according to the instructions. Gauge (8) indicates the pressure in the accumulator.

10. Close the filling valve (2) by turning the locking nut (3).

11. Close the nitrogen bottle valve (12).

12. Turn the pressure regulating valve (11) open.

13. Disconnect the quick couplings (5) and (6).

14. Release the elbow adapter (15) from the filling valve (2).

15. Mount the checking gauge (0--10 bar) in to the low pressure accumulator fillingvalve (2) and by opening the locking nut (3) let the pressure flow out until the gaugeshows3 -- 5 bar.

16. Tighten the locking nut (3) to20 Nm.

17. Refit the cap (4).

18. Assure the tightness of the accumulator by immersing it in water. Dry theaccumulator carefully for example with compressed air.

19. If the accumulator is not taken into use directly, release the pressure and store itin a dry place protected from dirt.


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7.3. Filling pressures of accumulators

7.3.1. Low pressure accumulator (LP)

Low pressure accumulator damps hydraulic vibrations in the return line. It also preventscavitation in return lines and channels. To get the optimum result of LP--accumulator, gaspressure should be half of the return line pressure. Normally it is from 3 to 5 bars.

7.3.2. High pressure accumulator (HP)

The main function of high pressure accumulator is to store pressurised oil during thereturn stroke of the piston. This stored pressure can be utilized during the next pistonstroke. Another vital function is to dampen vibrations. HP--accumulator gas pressureshould be related to the set max. percussion pressure according to graph below.

Stem--type diaphragm

0

10

20

30

40

50

60

70

80

90

100

100 120 140 160 180 200 220

Percussion pressure

Filling

pressure

Upper limit

Lower limit


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Normal (stemless) diaphragm

0

10

20

30

40

50

60

70

80

90

100

100 120 140 160 180 200 220

Percussion pressure

Filling

pressure

Upper limit

Lower limit

7.3.3. Pressure of stabilizer accumulator

HLX5 T . . . . . . . . . . 8 bar

HFX5 T . . . . . . . . . . 8 bar

HLX5 LT . . . . . . . . 30 bar

HL 800 T. . . . . . . . . 30 barHL 1500 . . . . . . . . . 50 bar

HL 1560 T . . . . . . . 40 bar


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8. MOUNTING THE PRESSURE ACCUMULATOR ON THE ROCK

DRILL

D See Hydraulic rock drill, repair instructions.

1. Before mounting the accumulator on the rock drill, remove the cover plugs fromthe accumulator connection port, and clean the joint surfaces both in theaccumulator and in the rock drill.

2. Check that the bolts move easily in their threads in the drill body. Lubricate thethreads of the bolts.

3. Fit the O--ring and the gasket.

4. Tighten the pressure accumulator bolts in two phases:pretightening100 Nm, final tightening200 Nm.

2

34

1

Tightening of the four--bolt accumulator

The four--bolt accumulator must be tighten by using a cross--tightening

method 1--3--2--4.CAUTION


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Repair instructions

2005 SANDVIK TAMROCK CORP., Tampere PlantP.O.Box 100FIN--33311 TAMPERE, FinlandTel +358 205 44 121

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Notes:

Documents

S03 Accumulator