AD-31 Handguns Manual.pdf - 第8页

8 108 835A Daily Operation Relieving Hydraulic Pressure Remove system pressure before disassembling and replacing any gun components. 1 . Heat the system to operating temperature. W ARNING : System or material pressurize…

108 835A

Daily Operation

Startup

WARNING: Hot! Risk of burns. Wear

heat-protective clothing, safety goggles and/or

heat-protective gloves depending on the symbol

shown.

1. At the applicator, bring the adhesive to application

temperature.

WARNING: Do not swivel or trigger the gun

while it is cold.

2. Turn on the applicator pump. Adjust the system

hydraulic pressure to the value required for the

application. The recommended adhesive

hydraulic pressure range is 2.41 - 4.83 MPa (350 -

700 psi).

WARNING: For most extrusion applications,

adhesive should not project further than 18 in.

from the nozzle when the gun is fired in the

horizontal position. Otherwise, system hydraulic

pressure may be too high, resulting in poor

pattern control and harm to personnel or

equipment.

3. Place the trigger lock in the unlocked position (see

Figure 2).

4. Aim the handgun so the nozzle is pointing at the

substrate.

5. Begin dispensing adhesive by squeezing the

handgun trigger toward the handle.

6. Stop dispensing adhesive by releasing the trigger.

Shutdown

WARNING: Hot! Risk of burns. Wear

heat-protective clothing, safety goggles and/or

heat-protective gloves depending on the symbol

shown.

1. Place the trigger lock in the locked position

(see Figure 2).

2. Turn off power to the applicator pump as

described in your applicator technical manual.

S Systems with a piston pump:

Reduce pump air pressure to zero and

disconnect the supply air line to the pump.

Place the air pump ON/OFF switch in the

OFF position.

S Systems with a gear pump:

Turn the motor speed dial to 0%.

Place the motor ON/OFF (or START/STOP)

switch in the OFF (or STOP) position.

3. Place the trigger lock in the unlocked position

(see Figure 2).

4203002

Figure 2 Lock Positions

1. Unlocked position 2. Locked position

4. Place a suitable waste container, capable of

withstanding adhesive temperatures of 230 _C

(450 _F), on the floor near the dispensing point.

5. Aim the gun so the nozzle points into the

container.

6. Drain adhesive from the handgun by squeezing

the trigger toward the handle. Continue

dispensing adhesive until system hydraulic

pressure is relieved and the gun is drained of

adhesive. Properly dispose of the drained

adhesive.

7. Place the trigger lock in the locked position

(see Figure 2).

8. Hang the handgun by the gun slot at the top of the

handle.

9. Relieve any residual hydraulic pressure as

described in the following topic.

10. Shut down the applicator as described in your

applicator operator instructions or technical

manual.

108 835A

Daily Operation

Relieving Hydraulic Pressure

Remove system pressure before disassembling and

replacing any gun components.

1. Heat the system to operating temperature.

WARNING: System or material pressurized.

Relieve pressure. Failure to observe may result

in serious burns.

2. Follow the procedures described in your applicator

technical manual to relieve system pressure. In

general, relieving system pressure requires that

you perform all of the following actions that are

appropriate for your unit:

S Systems with a piston pump:

Reduce pump air pressure to zero and

disconnect the supply (incoming) air line.

Place the air pump ON/OFF switch in the

OFF position.

S Systems with a gear pump:

Turn the motor speed dial to 0%.

Place the motor ON/OFF (or START/STOP)

switch in the OFF (or STOP) position.

3. Shield the area and the operator.

4. Trigger all handguns to relieve any trapped

hydraulic pressure.

5. Place the trigger lock in the locked position

(see Figure 2).

6. Reduce air pressure to the handgun by reducing

gun air pressure to zero at the regulator (spray

and swirl guns only).

WARNING: Hot! Risk of burns. Wear

heat-protective clothing, safety goggles and/or

heat-protective gloves depending on the symbol

shown.

7. Wear heat-protective safety gloves.

8. Place a pan under the drain valve and drain the

unit manifold by following the procedure described

in the applicator technical manual.

CAUTION: Equipment damage can occur if the

applicator drain valve is turned with anything

other than a screwdriver. Use only a screwdriver

to turn the drain valve.

9. Use a screwdriver to open the drain valve.

10. Allow the manifold to drain as completely as

possible.

11. Use a screwdriver to close the drain valve.

12. Properly dispose of the drained adhesive.

Daily Maintenance

Cleaning Exterior Surfaces

Clean all exterior gun and nozzle surfaces daily. Use a

cleaning fluid such as Nordson Type R fluid.

Accumulated hot melt material forms char, which can

cause unreliable operation of the applicator.

WARNING: Risk of death or serious injury from

explosion or fire if Nordson Type R fluid is heated

above 245 _C (475 _ F). Do not use Type R fluid

on surfaces that are above 245 _C (475 _ F).

108 835A

Weekly Maintenance

Cleaning the Nozzle

Clean gun nozzles weekly unless operating experience

indicates that a different schedule must be followed.

Depending on several factors, nozzle cleaning may be

required more or less frequently than once a week.

Among the factors affecting cleaning frequency are the

plant environment and the adhesive used.

CAUTION: Gun nozzles can be damaged if an

open torch, drill, or broach is used for cleaning.

Use only a pin-type probe to clean a nozzle.

To clean a nozzle on a Series AD-31 Handgun:

1. Heat the system to the adhesive manufacturer’s

recommended application temperature.

2. Relieve the system hydraulic pressure. (Refer to

Relieving Hydraulic Pressure in Daily Operation.)

3. Disconnect and lock out power to the main circuit

breaker for the applicator input power line.

4. Place the trigger lock in the locked position

(see Figure 2).

5. Use an appropriate size wrench to loosen the

nozzle.

4203003

Figure 3 Removing a Nozzle

6. Remove the nozzle.

7. Place the nozzle in a container of Nordson Type R

fluid and heat the container to the adhesive

melting point using a controlled heating source.

WARNING: Risk of death or serious injury from

explosion if Nordson Type R fluid is heated

above 245 _C (475 _ F). To maintain Type R fluid

at a safe temperature, use a controlled heating

source, such as a deep-fat fryer or hot plate with

a temperature controller.

WARNING: Risk of death or serious injury from

fire hazard if Nordson Type R fluid is heated

using an open flame or an unregulated heat

source. To maintain Type R fluid at a safe

temperature, use a controlled heating source,

such as a deep-fat fryer or hot plate with a

temperature controller.

WARNING: Risk of death or serious injury from

fire or toxic fumes. Use extreme care in selecting

a cleaning fluid other than Type R fluid. Cleaning

fluids other than Type R may present a toxic or a

fire hazard, even at room temperature.

CAUTION: Sludge formation can occur on a

nozzle if an incompatible cleaning fluid is used

with the hot melt adhesive. If a fluid other than

Nordson Type R fluid is used, test the fluid with a

small sample of the adhesive for compatibility

before using the fluid in the hot melt system.

NOTE: Another method of cleaning nozzles is to

place them in an ultrasonic cleaner filled with Type

R fluid.

8. Clean the nozzle bore by using a pin-type probe.

4204026

Figure 4 Cleaning a Nozzle with a Pin-type Probe

9. Reassemble the nozzle onto the gun.

10. Restore the system to normal operation by

following the startup procedures in the applicator

technical manual.