Download Manual, Automatic Hot Melt Gun Model AD-28

Automatic Hot Melt Gun
Model AD-28
Part 106 992A
NORDSON CORPORATION
l
AMHERST, OHIO.
USA
0
Nordson
42-14-00
CORPORA
‘TION
TECHNICAL
/ Amherst, Ohio 44&T/
PUB1
/CATION
CONTENTS
Title
Page
Contents
.
Page
Description
.
Specifications
Ancillary
Gun
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Equipment
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Assembi y Drawing
Theory
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.
of Operation
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Installation
.
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Operation
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Repair
.
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Trouble
Shooting
Chart
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-10
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-11
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-12
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-12
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Maintenance
and Electrical
Disassembly
.
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Reassembly
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Data
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Electrical
Exploded
View
Parts List
Service
.
Parts List
Optional
Parts List
42-14-O
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LITHO
lSSUE0
l/77
SUPERSEDES
U.S.A.
0
Nordso/t
CORPORATION
/Amherst,
TECHNICAL
Ohio 44001
AUTOMATIC
HOT
MODEL
Part
Figure
GUN
AD-28
Number
270
Model
1 -
MELT
4 2 - 14- 1
PUBLICATION
651
AD-28
Auto
Gun
DESCRIPTION
The
Model
AD-28
some other
gun
is heated
250F
The
Automatic
thermoplastic
Hot
materials
by two 170
Watt
Melt
Gun
Extrusion
at temperatures
cartridge
heaters
is designed
from
and
375OF
control
to apply
(19OOC)
led
hot melt
to 450°F
by preset
adhesives
(232OC).
thermostats
and
The
available
increments.
AD-28
The gun
features
is actuated
per minute
are
a bellows
in the
extrusion
by an electro-pneumatic
possible
when
a rapid
head
instead
solenoid
response
solenoid
of a packing
valve.
Cycling
cartridge
speeds
assembly.
to 2,400
cycles
is used.
SPECIFICATIIONS
Electrical
(heater
Operating
Air
Pressure
.
.
l
230
.
.
.
.
20 to 70 PSIG
VA.C,
50,/60
.
.
.
.
.
.
.
3.25
Nozzles
.
.
.
.
.
.
.
231 0X.X,
Solenoid
Valves
.
.
.
.
.
Refer
to Pages
.
.
.
.
.
Refer
to Applicator
Melt
Hose
.
Ibs.
Hz,
(1.4
Weight
Hot
LITHO
circuit).
(1.47
340
to 4.9
Watts,
I. 5 Amp
kg/cm2)
kg)
231 XXX,
57-l-
220 OXX,
270 59X
Series
1 and 57- l-3
Service
Manual
U.S.A.
na-onnrn
8178
COPYRIGHT
j)
1978 NORDSON
in
4 2 - I4-
2
0
Nordson
CORPORATION
/Amherst,
O~$IO44001
TECHNICAL
,
i ,,,>I
AIR
CYLINDER
AIR
PISTON
,/---
/
UPPER
PUBLICATION
BODY
BELLOWS
HEATER
THERMOSTAT
Figure
ISSUED
l/77
2
-
AD-28
Automatic
Gun
Drawing
LiTHO
SUPERSEDES
U S A.
0
Nordson
CORPORATION
/Amherst.
TECHNICAL
Ohio 44001
THEORY
The
AD-28
Automatic
bellows
assembly
heat control.
The
seat assembly
ball
tip.
The
upper
body
ed to the
upper
cylinder
two
is comprised
cartridge
is fastened
is secured
to the
to the
material
to the
is fed
of two machined
bodies.
A preset thermostat
underside
lower
heat
body
of the
upper
lower
to hold
The upper
top of the
into
OF OPERATION
heaters.
end of the bellows.
is secured
Molten
Gun
and
4 2 - 14- 3
PUB1 /CAT/ON
the
body
body
bellows
functions
The lower
is attached
and
makes
contact
air
with
An air
in place.
as the
body houses
to the block
cy linder
the
for
the
piston
bellows
is fasten-
base;
the
air
body.
exchanger
passages
in the
lower
throwJgh an electrically
body
Two cartridge
heaters
maintain
the application
temperature
heated
hose.
connected
electrically
to the hot melt hose through the armored
cordset.
in the gun.
They
are
INSTALLATION
3 -
Figure
The
AD-28
Automatic
Gun
may
AD-28
be mounted
Mounting
to extrude
Dimensions
material
in any
direction
necessary
for
the application.
A
A
1.
Secure
in the
2.
Attach
If the gun
jury,
the
is mounted
a deflector
AD-28
retainer
plate
to a l/2”
mounting
a non-circulating
so that
the
(shield)
(12.7
allows
LITHO
should
hot material
be installed
mm) diameter
mounting
the gun to be fastened
hot melt
hose to the
body.
Wrap the hose - gun connection
cure the insulating
cuff with the cable
3.
extruded
with
tie
Connect
the gun’s armored
cordset
to the
connections;
the green lead is the ground
male
cause
between
bar.
securely
connector
an insulating
could
the gun and
The square
to the
located
cuff
personnel
in the
to prevent
the operator.
head
mounting
set screw
bar.
gun’s
heat
in-
lower
loss.
Se-
supplied.
hose collar.
connection.
The
two
white
leads
are
the
power
U.S.A.
lSSUf D
8178
CIIDrDarnre
l/77
COPYRIGHT
C’ 1978
NORDSON
4 2 -
0
Nordson
Ia-4
INSTALLATION,
CQRPORA
After
the
cordset
electrical
to the
Install
5.
Do not begin this installation
power connection.
power to the applicator
has been shut off.
connections
hose collar
a solenoid
Attach
regulated
and
and
in the upper
A separate
actuated
When
7.
PUB1
ICATION
installation
start-up
have
retainer
been
supplied
the nipple
completed
secure
the armored
kit.
in the installation
supplied.
Wire
the solenoid
valve
to
filtered
solenoid
air
line
to the solenoid
are attached
to the
l/8
valve.
NPT
street
elbow
located
gun body.
air
supply
at an air
has been
instruct
cordset
procedure
device.
The nipple
NOTE:
the
on the gun using
triggering
a separately
at the hose collar
with
valve
the appropriate
6.
TECHNICAl
/ Amherst, Ohio 44001
(Continued)
This is a 230 VAC
until al I electrical
4.
TION
line
to the guns is suggested
pressure
completed,
other
refer
to
than
that
driving
the applicator
since
the guns may be
the applicator
service
manual
pump.
for initial
ions.
OPERATION
The
are
Nordson
heated
Hot Melt
system
to the appropriate
The AD-28
0
exceed
+
r*
A
Gun
not extrude
application
self-relieves
this
adhesive
at 800
maximum
unless
the applicator,
PSIG
operating
(56.25
kg/cm
to avoid
pressure
2 ) hydraulic
injury
air
pressure
pressure
within
the
is dependent
hydraulic
upon
the
5)
6)
gun cycle
8)
nozzle
selection
adhesive
The gun’s
gulator
pressure.
to personnel
Do not
or damage
to
system
4)
7)
and guns
following:
type of hydraulic
s stem (piston pump, gear pump)
length of hot melt 1:ose(s)
gun application
temperature
(as determined
by gun thermostat)
2)
3)
hoses
temperature.
equipment.
actuating
1)
will
size
(orifice
of gear
viscosity
actuating
ahead
size
(operating)
air
and
flow
rate)
speed
pump valve
pressure
(pressure
may
of the gun in the air
relief,
be determined
supply
internal
and
circulation)
adjusted
by installing
a standard
air
re-
line.
LITHO
ISSUED
l/77
SUPERSFl7FS
U S A.
0
Nordson
CORPORATION
TECHNICAL
Ohio 44001
/Amherst.
4 2 - 14- 5
PllBLICATlON
TROUBLESHOOTING
CONDITION
PROBABLE
Mel ten material
leaks
around seat when
nozzle
is removed
seat assembly.
Air
leaks
between
Dirty
air
cylinder
and upper
gun body
Gun
fails
or damaged
tip and seat assembly.
Replace
gasket.
Tighten
4 screws.
air
cyl inder
cylinder
bellows
Damaged
bellows.
in nozzle
Replace
O-ring.
Replace
bel lows.
Clean
or seat.
or replace
Replace
bal I tip and seat
piston
clearance
and upper
Too long air
and solenoid.
Faulty
O-ring.
ball
nozzle
stem
l/4
or seat.
tip and seat assembly.
.
Insufficient
air
gasket.
loose.
Damaged
Dirt
line
between
gun body.
between
gun
Back piston off bellows
to l/2 turn.
stem
Use 3” nipple
solenoid
to attach
l/4
to gun.
Replace
bel lows spring.
Adhesive
to extrude
ball
Damaged
Damaged
fails
Replace
tip and
Back
iston off bellows
to l/ f turn.
assembly
Gun
ball
SOLUTION
Insufficient
clearance
between
piston and upper gun body.
Air
to shut off
+
CAUSE
spring.
Al low additional
not up to application
warm-up-time.
temperature.
adhesive
Nozzle
Clean
clogged.
Insufficient
(check)
Increase
air to gun solenoid.
nozzle.
actuating
air
to gun
solenoid.
Gun
Faulty
Worn
not heating.
solenoid
valve.
air piston.
~~1
Insufficient
LITHO
clearance
U.S A.
ISSUED
1177
thermostat
Check
gun heaters
.
(2).
Replace
solenoid
.
Replace
air piston.
I
I
1
Check
SUPERSEDES
I
between
COPYRIGHT
@
I977
NORDSON
4 2 - I4-
0
Notdson
6
TROUBLE
CQRPORA
SHOOTING,
fails
/Amherst.
PROBABLE
Open
to heat
Faulty
PUB1
ICATION
gun circuit
fuse.
thermostat.
Defective
Faulty
overheats
SOLUTION
CAUSE
Loose electrical
Gun
TECHNICAL
Ohio 44001
(Continued)
CONDITION
Gun
TION
open
Replace
thermostat.
Check
collar.
connection.
heaters.
thermostat
Replace
.
fuse.
electrical
leads
Replace
gun heaters
Replace
thermostat.
at hose
(2).
I
m
0
MAINTENANCE
To perform
to optimum standards the
contaminants
and charred adhesive.
Wear
safety
gloves
AD-28
automatic
gun should be kept clean and free
The gun should be cleaned
on a regular basis.
(P/N
902
and eye
514)
protection
when
handling
from
2
u’
rfl
0
hot parts.
;
vl
.
A
t
::
%
Cleaning
solvents
may be caustic,
ing a cleaning
solvent
regarding
safe use.
other
than
Do not use an open flame device
by extreme
heat may result.
0
0
toxic,
Type
to heat
or a fire
R. Always
hazard.
follow
the gun or its components.
Do not use a drill or broach to clean a hot melt nozzle.
and a flame1 ess heat gun to clean hot melt nozzles.
Electrical
Use care when selectthe solvent’s
caution
Use a piano
Damage
wire
Y
f
caused
probe
Repair
The AD-28
contains
and two cartridge
The thermostat
two
may be checked
When
NOTE:
electrical
a preset
components:
thermostat
erature
replacing
and replaced
the thermostat
quickly
be certain
aftelr removing
a built-in
heat
limiter)
to replace
the gun’s
it with
electrical
enclosure.
one of the same temp-
rating.
The two cartridge
the heaters,
(with
heaters.
heaters may be checked
after removing
the electrical
enclosure.
the gun lower body must be separated
from the rest of the gun.
To replace
LITHO
ISSUE0
4/78
SUPERSEDES
1177
U.S.A.
0
Notdson
CORPORATION
MAINTENANCE,
/Amherst,
TECHNICAL
Ohio 44001
42-14-T
PUBLICATION
(Continued)
Before separating
the lower body check the cartridge
heaters to determine
if they
are faulty.
This can be done by conducting
a cold ohms resistance
test on each
heater.
NOTE:
The cold
ohms resistance
reading
should
be:
306-357
ohms.
Remember,
the cartridge
heaters are control led by the thermostat
w/heat
limiter . If the t hermostat or heat limiter
has failed
in the open mode the heaters will not function.
Check across the
thermostat
leads for continuity
before assuming the heaters are defective.
connections
Check the gun’s electrical
components
are defective.
Also,
replace
b e certai n to check the gun circuit
i t with a fuse of the same ampere
A
fuse (found
rating.
before
assuming
in the applicator)
e
the gun’s
electrical
If it is open
(blown),
DISASSEMBLY
Do not attempt
to disassemble
the AD-28
gun or disconnect
the hot melt hose until
the electrical
and air supply to the applicator
have been shut off and hydraulic
pressure in the system has been relieved.
Aft ‘er removing
the electrical
for key numbers):
enclosure
disassemble
the AD-28
in this manner
(refer
1.
Loosen and remove the four screws and lockwashers
upper body (8).
This frees the air cylinder
gasket
assembl y (5).
2.
To remove the air piston assembly loosen the locknut
(6) while
nut.
Then thread the air piston assembl y off the bel lows stem.
3.
To free the bellows or the cartridge
heaters remove the four oval head screws
end of the gun.
Doing this will free the ball seat (19),
the lower body (17),
(18),
from the upper
4.
Now
the spring
5.
The ball
bellows.
tip
(21)
Be certain
ball tip.
NOTE:
LITHO
at the hose collar
(12),
that
body
to Figure
that secure the air cylinder
(3) to the
(4) and permits access to the air piston
holding
the air
piston
assembly
from the lower
and the sleeve
(8).
bellows
(13),
is attached
0 -ring
(15)
to the bellows
and support
(13)
washer
is removed
(16)
are free.
by threading
it off the
to hold the bellows by the flats on the upper end when removing
the
Following
this procedure
wil I eliminate
damage to the bellows or threads.
The ball tip (2 1) and seat (19)
241 109.
must be replaced
as a set.
Use P/N
U.S A.
ISSUED
l/77
6
SUPERSEDES
COPYRIGHT
@
1977 NORDSON
4 2 - 14-
8
0
Notdson
DISASSEMBLY,
6.
TECHNICAL PUBLICATION
/ Amherst, Ohio 44001
(Continued)
The thermostat
the thermostat
(Refer
CQRPORATION
to the
is attached
to the lower body by two fill ister head screws.
When replacing
(26) be certain
to replace
it with the correct temperature-rated
thermostat.
Parts List for temperature-ratings
and part numbers).
REASSEMBLY
1.
(See
Figure
stat (26)
6) insert
to the block
the cartridge
with
heaters
(25)
2.
Place
3.
Thread the bal I tip (21) on the bellows using
by the flats on the upper end when threading
the bellows
support
washer
4.
Insert the bellows
(13) with
the tip appears at the lower
5.
Place
the spring
(12)
over
in the lower
body
(17).
Attach
the thermo-
two screws.
(16)
and O-ring
(15)
end of the lower
Locktite
#40 on the threads.
the ball
tip on to avoid
its O-ring
(14) through
end of the body.
the bellows
in the upper
and position
Hold
damage
the upper
end of the lower
the upper
body
body.
the bellows
to the bellows.
body until
(8) on the lower
body
(17).
NOTE:
Be certain
to orient the upper body on the lower body properly.
The
street elbow (7) where the solenoid valve is attached
should be directly
above
6.
7.
Insert the sleeve (18) in the lower end of the lower body, be certain
the O-ring
is in position
on the ball seat (19),
and secure the ball seat,
lower body and upper body together
with
four oval head screws.
Torque each screw to 25-30
inch-pounds.
Thread
the air
piston
of the upper body.
secure the assembly
8.
Place
gasket
Torque
9.
10.
the gun thermostat.
the air cylinder
assembly (5) on the bellows
Then back the air piston off
on the bellows
stem.
gasket
(4) on the upper
until the air piston rests against the top
l/4 to l/2 turn.
Use the locknut
(6) to
body,,
and secure the air cylinder
to the upper
each screw to 25-30
inch-pounds.
position
hod;/ with
the air
cylinder
(3) over
the
four screws and lockwashers.
Attach
the bracket
and armored cordset with bracket
to the rear of the lower body.
Make
the electrical
connections
(refer to Figure 4).
Attach the electrical
enclosure
to the gun
body with two screws.
Place
the nozzle
in the retaining
nut and secure
the retaining
nut to the
lower
end of the
gun.
LITHO
ISSUED
T/77
SUPERsrnFs
U.S.A.
0
Motdson
CORPORATION
/Amherst,
TECHNICAL
Ohio 44001
PUB1
/CATION
42
- 9
14 -
THERMOSTAT
,
, 1, ,
,
--/HEAT
LIMITER
,_
/’/’
ARMORED
CORDSET
Figure
4
-
Wiring
Diagram
L-2
Figure
5 -
Electrical
ELECTRICAL
I Part
066
Heater,
270
653
270
654
Thermostat
Thermostat
270
655
270
656”
LITHO
Shipped
U.S.A.
/ss//Fn
l/77
PARTS
LIST
Description
No.
938
*
Schematic
with
unless
Cartridge,
240
Req’d.
VAC,
w/Heat
w/Heat
Limiter,
Limiter,
Thermostat
w/Heat
Thermostat
w/Heat
otherwise
specified.
170 Watts
375OF
400°F
(190°C)
(204OC)
Limiter,
425OF
(2 18oC)
Limiter,
450°F
(232OC)
2
4 2 -
'I &
CORPORA
I O
TION
TECHNICAL
/ Amherst. Ohio 44001
PUBLICATION
28
24
/
Figure
ISSUED
l/77
6 - AD-28
Exploded
SUPERSFI)F-C
View
LITHO
U.S.A.
0
Nordson
CORPORATIQN
/Amherst.
TECHNICAL
Ohio 44001
PARTS
Fig.
4 2 -14-l
LIST
Descript
Req’d.
Part
;
2
3
270 651
981
140
983 120
153 028
Gun,
. Screw,
Automatic,
Fil.
Hd.,AD-2:3
lo-32
. Lockwasher,
#lo
. Cylinder,
Air
4
5
153031
153 022
.
.
Gasket,
Air Cylinder
Piston Assembl y, Air
6
984
240
539
274
.
.
.
.
10
11
940
973
270
270
270
981
983
090
125
263
157
607
148
120
.
.
.
.
.
.
.
O-ring,
7/32 x 11/32
El bow, Street,
l/8 NPT
Body, Upper Gun
Mounting , Retainer
Insulator
Screw,
Fil.
Hd.,
lo-32
x l-1/4
Lockwasher,
#lo
12
13
981 405
152 934
270 617
.
.
.
Screw,
Spring
Bellows
14
940
060
.
.
15
16
940
270
161
616
:
.
. O-ring,
Vi ton, l/8 x l/4
. Rod, Bellows
. Bellows
O-ring,
Viton,
5/8x
3/4
Washer,
Bel lows Support
1
1
1
1
1
17
18
270
270
626
615
.
.
Body w/Sleeve,
Lower
. Sleeve,
Lower Body
1
1
241
109
.
940
181
:
981
231
197
312”
I
.
Bal I Tip and Seat Assembly
Seat (Items 19 and 2 1 are matched
set)
: O-ring,
Viton,
3/‘4 x 7/8
Tip (Items 19 and 21 are matched
set)
Screw,
Oval
Hd.,
10-32 x 2-l/4
Nozzle
1
1
1
1
4
1
152
938
270
981
290
066
656*
000
.
.
.
Nut,
Nozzle
Retaining
Cartridge,
Heater,
2d40 VAC,
170 Watts
Thermostat
w/Heat
Limiter,
45oOF
Screw,
Fil . Hd.,
5-40 x l/4
1
2
1
2
933
972
270
981
056
050
602
178
.
.
Connector,
Connector,
Enclosure,
Screw,
Pan
3
1
1
2
270
609
608
.
Cordset,
Bracket
:
.
.
.
.
Wire Group
Terminal,
Ring Tongue
Conduit,
Electrical
Cordset
1
1
1
.
.
.
.
.
.
.
.
.
1
1
1
1
4
4
19
20
21
22
23
24
25
26
27
;8
933
270
981
983
Shipped
with
No.
i’on
Key
*
006
610
113
120
.
.
.
:
.
unless otherwise
Nut,
Nut,
1
1
lo-32
(3/8”
Seal Lock,
Set,
Sq.
Ref.
4
4
1
x 1
Flats)
lo-32
(7/16”
Hd.,
3/8-16
1
1
Flats)
1
1
1
1
1
2
2
1
1
1
x 3/4
Porcelain
Male,
9/‘16-18
x l/4
Electrical
w/Plate
Hd.,
lo-24
x 7/8
NPT
1
Armored
Bracket,
Conduit
Conduit,
Flexible
Fitting,
Conduit
Fitting,
Electrical
Screw,
Fil.
Hd
lo-23
Lockwasher,
#lb’
Electric
Conduit
x 3/8
specified.
U.S.A.
/SSUED
1
6
7
8
9
1 ITHO
PUBLICATION
lo/78
.
SUPERSEDES
8/n
COPYRIGHT
3
1978 NORDSON
I
0
Nordson
42-14-12
CQRPORA
TION
/Amherst.
SERVICE
Fig/Key
6/20
6/14
6/15
Part
No.
270
940
624
181
153 031
6/;3
6/20
6/15
6/18
6/19
6/20
6/2 1
Kit,
Bellows,
AD-28
. BeI lows
. O-ring,
Viton,
3/4x
7/8
. O-ring,
Viton,
5/8 x 3/4
Ref.
1
1
Ref.
1
1
940
161
270
626
Body w/Sleeve,
. Body, Lower
270
615
.
241
109
940
181
Ball Tip and Seat
. Seat
. O-ring,
Viton,
. Tip
sleeve,
OPTIONAL
No.
270
270
270
653
654
655
1
Lower
Gun
Lower
Gun
Ref.
1
1
1
Assembly
3,/4*x
7/8
THERMOSTATS
Description
I
I
Thermostat
Thermostat
w/Heat
w/Heat
Limiter,
Limiter,
375OF
400°F
(19oOC)
(204OC)
Thermostat
w/Heat
Limiter,
425OF
(218oC)
ANCILLARY
Long Engagement
Req’d.
Ref.
1
1
1
1
1
625
617
181
I Part
EQUIPMENT
Nozzles
Optional
Engagement
Dual Orifice
Nozzles
Extended
Nozzles
/CA TION
Kit, Seal AD-28
. G-ring,
Viton,
3/4 x 7/8
. O-ring,
Viton,
l/8 x l/4
. O-ring,
Viton,
“i/8 x 3/4
Air
. Piston Assembly,
Air Piston
. Gasket,
270
270
940
6/;7
PUB1
PARTS
Description
940 060
940 161
153 022
6/S
6/4
TECHNICAL
Ohio 44001
Nozzles
.
.
.
’
.
.
.
.
231
OXX
Series
.
.
.
.
.
.
231 XXX
220 OXX
Series
Series
270
Series
59X
LITHO
ISSUED
d/78
SUPERSEDES
8/77
U.S.A.