Atlas Copco 8431080042 Инструкции к продуктам - Страница 9

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LTP61 H700-25

Adapt the shape of the reaction bar so that the point of contact (K) falls within the marked area (F).

The minimum breaking force is obtained if the point of contact (K) is on or close to line (B –

E).

If the point of contact falls within angle (α) – in area (G) – there is a risk of overloading of the bear-

ings for the machine drive and deformation of the reaction bar.

If the point of contact is outside angles ± 15

hexagon sleeve and reduced torque accuracy.

Bending the reaction bar, Fig B

It is recommended to concentrate the heat to the inside radius in order not to reduce the original

width (W), see fig. B.

Heat the spot to red colour.

After bending, allow to cool slightly in room temperature and then chill.

In order for the torque reaction bar to be as light as possible it is recommended that the section out-

side the bend be configured as shown in Fig. B.

After bending, attach the accompanying warning sign to the reaction bar, see fig. C, and mark the

side of the reaction bar that should be placed against the support in a suitable way.

Assembling the reaction bar

Place the reaction bar in the wanted position on the machine.

Tighten the nut to a torque of 70 Nm, 90 Nm or 100 Nm respectively, in accordance with the specifi-

cation on the exploded views.

Check regularly that the lock ring is firmly secured.

Using the reaction bar

Apply the reaction bar according to figure C – opposite the direction of the drive of the machine – be-

fore starting the machine.

Never put your hand on or close to the reaction bar while the machine is being used.

Tightening torque

For accurate operation and safety, the tightening torque of the nut runner must be set correctly in relation

to the screw joint. Check the tightening torque given to the joint in question.

The air pressure is set at as high a level as possible up to max 6.3 bar – with the aid of a compressed air

regulator. Installation of an Atlas Copco regulator, type MIDI REG 15, is recommended.

Loosen the set screw and adjust the torque setting by means of the screw. The torque is increased when

screwing the screw clock-wise. After adjustment, tighten the screw.

If shut-off is carried out at high speed of revolution, causing a high torque scatter, it is recommended

to reduce the air pressure.

Verification of tightening torque

Atlas Copco Torque Analyser, ACTA 3000, plus an appropriately-sized in-line transducer, IRTT to-

gether with the available test joints are recommended equipment.

– in areas (H) – there is a risk of rapid wear of the

Operation