Atlas Copco SECOROC COP 84.2L Manual - Halaman 9

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1. Technical Data

Breakout bench

It is always most convenient to

break the hammer threads on the

rig. For circumstances, when the

threads cannot be broken or tend to

get stuck, there is a breakout bench

available. Ordering No.

9178.

N.B. Failure to attach the wrench

as illustrated (B, C) may result in

damage to the cylinder. Any such

damage will not qualify for compen-

sation.

Removing the drill bit

The drill bit can be removed in a number of different ways, depending

on the tools available. The following two meth-

ods are commonly used:

A. Breaking the driver-chuck

joint using percussion only

Run the hammer into the rock or a thick plank.

Apply light feed force.

Carefully start the impact mechanism of the

hammer.

Stop the impact mechanism as soon as the

driver-chuck joint "cracks".

Run the hammer up the feed beam to a

suitable working height, and unthread the driver

chuck and drill bit.

N.B. Beware of the weight of the drill bit. It could

be too heavy to hold.

B. Breaking the driver-chuck joint

using the bit removal tool

If the driver-chuck joint is very tight, the special bit-

removal tool should be used to break the joint.

Important: Never use a sledge-hammer on down-

the-hole hammers.

Place the bit-removal tool in the drill steel support.

N.B. Looking from behind the feed beam, make sure

that the shaft of the bit-removal tool is touching the left-

hand edge of the feed beam.

Carefully run the bit down into the bit removal tool.

Slowly start up the impact mechanism of the hammer.

Stop the impact mechanism as soon as the

driver-chuck joint "cracks".

Unscrew the driver chuck by rotating the COP

hammer to the LEFT (anti-clockwise).

Dirt in the hammer

Stoppages and breakdowns caused by dirt in the percussion mecha-

nism are practically inevitable with all rock drills, and DTH hammers are

no exception. However, it should be remembered that, while DTH ham-

mers are no more sensitive to dirt than tophammers, there is obviously

a greater risk of dirt ingress in down-the-hole drilling, especially during

pipe jointing. Any dirt that enters the drill pipes goes straight into the

percussion mechanism. To ensure reliable operation of the hammer,

every effort should therefore be made to prevent dirt from entering the

drill pipes. The following rules should be observed:

Always keep drill pipes clean. Always store or stack drill pipes

in such a way that the risk of dirt ingress is minimized. Do not let

the thread ends rest on grit or mud. Use thread covers wherever

practicable.

Always keep the open thread end of the drill pipe covered during

jointing, and remove the cover just before the pipe is coupled up.

Before coupling up, check that the drill pipe is clean around the

threads and on the inside. If in doubt, blow clean the pipe. Remember

to cover the pipe end that is already in the hole.

If threads are dirty, they should be cleaned using a strong bristle

brush or a cloth.

N.B. Always clean away from the hole in the pipe. Do NOT let grit fall

into the hole in the pipe. After cleaning, always coat the threads with

Atlas Copco thread grease before jointing.

Take extra care during jointing operations when drilling in abrasive

rock formations, since the ingress of quartz particles into the hammer

will cause heavy wear.

When drilling holes in water-bearing rock, never leave the hammer

at the hole bottom with the air supply switched off. If drilling is to be

suspended temporarily, always pull up the hammer by at least two

pipe lengths.

Clean around the driver chuck before changing the drill bit. Make

sure the shank of the new drill bit is clean.

Keep the hammer clean and plug both ends when not in use.

Change worn or damaged parts in good

time.

All Secoroc COP down-the-hole hammers

contain a check valve that is designed to trap

a quantity of air inside the hammer when the

air supply is switched off. In most conditions,

this prevents the ingress of water and dirt

into the hammer during jointing operations.

The check valve A and O-ring B must be

fault-free when drilling in water-bearing for-

mations. When drilling deep holes in rock

with a high water inﬂ ow, however, it is pos-

sible that some seepage of water into the

front of the hammer will take place during

jointing. Since only very small particles of

dirt would be able to penetrate the

hammer in this way, the threat to the

hammer is not serious.

The sealing efﬁ ciency of the check

valve can be checked by pouring

a small quantity of lubricant through

the top sub of the hammer, with the

hammer held vertical. If the lubricant

passes through the checkvalve, then

the valve spring and/or valve seal

is worn or damaged and should be

replaced immediately.

WARNING

Take great care when jointing the drill pipes and handling the drill

bit.

Mind your ﬁ ngers!

Keep your clothing, hair etc. well clear of rotating components!

Carelessness can result in serious injury.

Other instructions

Wear to the driver chuck and hammer cylinder

Since the driver chuck and hammer

cylinder are "sand-blasted" continuously

by large volumes of abrasive cuttings

during drilling, they eventually be come

worn out. The areas adjacent to the

cuttings grooves in the drill bit will

be subjected to the most wear. To pre-

vent uneven wear of the hammer cylin-

der, therefore, the driver chuck and bit

should be marked as shown in ﬁ gure,

before the chuck is lifted off the bit.

When ﬁ tting the driver chuck back on