Manual, Automatic Hot Melt Gun Model AD-28
Contents
1. 3 i EY AMHERST OHIO 44001 USA Figure 1 Model AD 28 Auto Gun DESCRIPTION The Model AD 28 Automatic Hot Melt Extrusion Gun is designed to apply hot melt adhesives and some other thermoplastic materials at temperatures from 375 F 190 C to 450 F 232 C The gun is heated by two 170 Watt cartridge heaters and controlled by preset thermostats available in 25 F increments The AD 28 features a bellows in the extrusion head instead of a packing cartridge assembly The gun is actuated by an electro pneumatic solenoid valve Cycling speeds to 2 400 cycles per minute are possible when a rapid response solenoid is used SPECIFICATIONS Electrical heater circuit 230 VAC 50 60 Hz 340 Watts 1 5 Amp Operating Air Pressure 20 to 70 PSIG 1 4 to 4 9 kg cm 8 78 Corrected heater specs Weight P 48e 3 se ox 3 25 165 1 47 kg Nozzles p oa we 8 231 OXX 231 220 270 59X Series Solenoid Valves Refer to Pages 57 1 1 57 1 3 Hot Melt Hose E g cO Refer to Applicator Service Manual LITHO U S A 8 72 1 77 COPYRIGHT C 1978 NORDSON Pern Cnrnarnaararn 42 14 2 CORPORATION Amherst Ohio 44001 TECHNICAL PUBLICATION AIR CYLINDER _ AIR PISTON UPPER BODY D E _ BELLOWS A HEATER ul ee LOWER BODY THERMOSTAT Figure 2 AD 28 Automatic Gun Drawing ISSUED 1 77 SUPERSEDES LITHO2. 270 615 241 109 940 181 270 653 270 654 270 655 Long Engagement Nozzles Optional Engagement Nozzles Dual Orifice Nozzles Extended Nozzles ISSUED 4 78 SERVICE PARTS Description Kit Seal AD 28 O ring Viton 3 4 x 7 8 O ring Viton 1 8 x 1 4 O ring Viton 5 8 x 3 4 Piston Assembly Air Gasket Air Piston Kit Bellows AD 28 Bellows O ring Viton 3 4 x 7 8 O ring Viton 5 8 x 3 4 Body w Sleeve Lower Body Lower Gun Sleeve Lower Gun Ball Tip and Seat Assembly Seat O ring Viton 3 4 x 7 8 Tip OPTIONAL THERMOSTATS Description Thermostat w Heat Limiter 3759F 1909C Thermostat w Heat Limiter 400 F 204 C Thermostat w Heat Limiter 4259F 2189C ANCILLARY EQUIPMENT 23 OXX Series 231 XXX Series 220 OXX Series 270 59X Series SUPERSEDES 8 77 TECHNICAL PUBLICATION N d ezis Buli 0 pasinay g y LITHO USA
3. Damaged ball tip and seat assembly Insufficient clearance between air piston and upper gun body Too long air line between gun and solenoid Faulty bellows spring Adhesive not up to application temperature Gun fails to extrude adhesive Nozzle clogged Insufficient air to gun solenoid Gun not heating Faulty solenoid valve Worn air piston Air movement around gun causes cooling Insufficient clearance between air piston and air cylinder SUPERSEDES TECHNICAL PUBLICATION 42 14 85 SOLUTION Replace ball tip and seat assembly Back piston off bellows stem 1 4 to 1 2 turn Replace ball tip and seat assembly Back piston off bellows stem 1 4 to 1 2 turn Use 3 nipple to attach solenoid to gun Replace spring Allow additional warm up time Clean check nozzle Increase actuating air to gun solenoid Check thermostat Check gun heaters 2 Replace solenoid Replace air piston Eliminate cooling air flow Tighten air piston on bellows stem 1 4 to 1 2 tum COPYRIGHT C 1977 NORDSON 42 14 6 CORPORATION Amherst Ohio 44007 TECHNICAL PUBLICATION TROUBLE SHOOTING Continued CONDITION PROBABLE CAUSE Gun fails to heat Open gun circuit fuse SOLUTION Replace open fuse Faulty thermostat Replace thermostat Check electrical leads at hose collar Replace gun heaters 2 Faulty thermostat Replace thermostat MAINTENANCE To perform t
4. OPERATION The Nordson Hot Melt system will not extrude adhesive unless the applicator hoses and guns are heated to the appropriate application temperature The AD 28 self relieves at 800 PSIG 56 25 kg cm2 hydraulic pressure Do not exceed this maximum operating pressure to avoid injury fo personnel or damage to equipment Gun actuating air pressure is dependent upon the following pressure within the hydraulic system type of hydraulic system piston pump gear pump length of hot melt hose gun application temperature as determined by gun thermostat nozzle size orifice size and flow rate gun cycle operating speed selection of gear pump valve pressure relief internal circulation adhesive viscosity C1 4 kenge gege ee ee ee The gun s actuating air pressure determined and adjusted by installing a standard air gulator ahead of the gun in the air supply line LITHO USA ISSUED 1 77 SUPERSFNES CORPORATION Amherst Ohio 44001 LITHO U S A ISSUED 1 77 TROUBLESHOOTING CONDITION PROBABLE CAUSE Dirty or damaged ball tip and seat assembly Molten material leaks around seat when nozzle is removed Insufficient clearance between piston and upper gun body Damaged air cylinder gasket Air leaks between air cylinder and upper gun body Air cylinder loose Damaged bellows O ring Damaged bellows Dirt in nozzle or seat Gun fails to shut off
5. U S A CORPORATION Amherst Ohio 44001 TECHNICAL PUBLICATION 42 14 3 THEORY OF OPERATION The AD 28 Automatic Gun is comprised of two machined bodies The lower body houses the bellows assembly and two cartridge heaters A preset thermostat is attached to the block for heat control The seat assembly is fastened to the underside of the lower body and makes contact with the bellows ball tip The upper body is secured to the lower body to hold the bellows in place air piston is fasten ed to the upper end of the bellows The upper body functions as the air cylinder base the air cylinder is secured to the top of the upper body Molten material is fed into heat exchanger passages in the lower body through an electrically heated hose Two cartridge heaters maintain the application temperature in the gun They are connected electrically to the hot melt hose through the armored cordset INSTALLATION Figure 3 AD 28 Mounting Dimensions 8 78 Corrected dimensions The AD 28 Automatic Gun may be mounted to extrude material in any direction necessary for the application If the gun is mounted so that the extruded hot material could cause personnel jury a deflector plate shield should be installed between the gun and the operator l Secure the AD 28 to a 1 2 12 7 mm diameter mounting bar The square head set screw in the retainer mounting allows the gun to be fastened securely to the mounting bar 2 Attach
6. a non circulating hot melt hose to the male connector located in the gun s lower body Wrap the hose gun connection with an insulating cuff to prevent heat loss cure the insulating cuff with the cable tie supplied 3s Connect the gun s armored cordset to the hose collar The two white leads are the power connections the green lead is the ground connection LITHO U S A 4 1 8 78 1 77 COPYRIGHT C 1978 NORDSON 42 14 4 Nordson CORPORATION Amherst Ohio 44001 TECHNICAL PUBLICATION INSTALLATION Continued This is a 230 VAC power connection Do not begin this installation procedure until all electrical power to the applicator has been shut off 4 After the electrical connections at the hose collar have been completed secure the armored cordset to the hose collar with the cordset retainer supplied in the installation kit Se Install a solenoid valve on the gun using the nipple supplied Wire the solenoid valve to the appropriate triggering device 6 separately regulated and filtered air line to the solenoid valve NOTE The nipple and solenoid are attached to the 1 8 NPT street elbow located in the upper gun body A separate air supply line to the guns is suggested since the guns may be actuated at an air pressure other than that driving the applicator pump 7 When installation has been completed refer to the applicator service manual for initial start up instructions
7. 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 The cold ohms resistance reading should be 306 357 ohms Remember the cartridge heaters are controlled by the thermostat w heat limiter If the thermo stat 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 Check the gun s electrical connections at the hose collar before assuming the gun s electrical components are defective Also be certain to check the gun circuit fuse found in the applicator If it is open blown replace it with a fuse of the same ampere rating 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 After removing the electrical enclosure disassemble the AD 28 in this manner refer to Figure 6 for key numbers l Loosen and remove the four screws and lockwashers that secure the air cylinder 3 to the upper body 8 This frees the air cylinder gasket 4 and permits access to the air piston assembly 5 2 remove the air piston assembly loosen the locknut 6 while holding the air piston assembly nut Then thread the air piston assembly off the bellows stem 3 free the bel
8. 3 4 1 152 934 Spring 270 617 Bellows 940 060 O ring Viton 1 8 x 1 4 1 Rod Bellows 1 Bellows 1 940 161 O ring Viton 5 8 x 3 4 1 270 616 Washer Bellows Support 270 626 Body w Sleeve Lower 270 615 Sleeve Lower Body 241 109 Ball and Seat Assembly 1 2 Seat Items 19 and 21 are matched set 1 a 940 181 e O ring Viton 3 4 x 7 8 1 Tip Items 19 21 are matched set 1 981 197 Screw Oval Hd 10 32 x 2 1 4 4 231 312 Nozzle xe 152 290 Nut Nozzle Retaining 1 b 938 066 Cartridge Heater 240 VAC 170 Watts 2 5 270 656 Thermostat w Heat Limiter 450 F 1 981 000 Screw Fil Hd 5 40 x 1 4 2 gt 933 056 Connector Porcelain 3 E 972 050 Connector Male 9 16 18 x 1 4 NPT 270 602 Enclosure Electrical w Plate 1 981 178 Screw Pan Hd 10 24 x 7 8 2 270 608 Bracket 1 270 609 Cordset Armored S Wire Group 1 933 006 Terminal Ring Tongue 1 270 610 Conduit Electrical Cordset Bracket Conduit l Conduit Flexible Electric Fitting Conduit 1 i a Fitting Electrical Conduit 1 981 113 Screw Fil Hd 10 23 x 3 8 4 983 120 Lockwasher 710 4 Shipped with unless otherwise specified LITHO U S A ISSUED 10 78 SUPERSEDES 8 77 COPYRIGHT 1978 NORDSON 42 14 12 CORPORATION Amherst Ohio 44007 270 624 940 181 940 060 940 161 153 022 153 031 270 625 270 617 940 181 940 161 270 626
9. Amherst Ohio 4400 TECHNICAL PUBLICATION 42 14 9 THERMOSTAT HEAT LIMITER pre ARMORED E 2 HEATERS 2 Figure 4 Wiring Diagram LI Figure 5 Electrical Schematic ELECTRICAL PARTS LIST Description 938 066 Heater Cartridge 240 VAC 170 Watts 270 653 Thermostat w Heat Limiter 3750F 190 C 270 654 Thermostat w Heat Limiter 400 F 204 C 270 655 Thermostat w Heat Limiter 4259F 218 C 270 656 Thermostat w Heat Limiter 450 F 232 C Shipped with unless otherwise specified LITHO U S A ISSHEN 1 77 Criipepernre CP VDIC Ff 1077 nn 42 14 10 CORPORATION Amherst Ohio 4490 TECHNICAL PUBLICATION Figure 6 AD 28 Exploded View ISSUED 1 77 SUPERSFNES LITHO U S A Nordson CORPORATION Amherst Ohio 44001 TECHNICAL PUBLICATION 42 14 11 PARTS LIST Ess Part No Description 270 651 Gun Automatic AD 28 ef 1 981 140 Screw Fil Hd 10 32 x 1 4 2 983 120 Lockwasher 10 4 3 153 028 Cylinder Air 4 153 031 Gasket Air Cylinder 5 153 022 Piston Assembly Air l 6 984 539 Nut 10 32 3 8 Flats 1 240 274 Nut Seal Lock 10 32 7 16 Flats 1 940 090 O ring 7 32 x 11 32 1 Z 973 125 Elbow Street 1 8 NPT 1 8 270 263 Body Upper Gun 9 270 157 Mounting Retainer 1 270 607 Insulator 1 1 981 148 Screw Fil Hd 10 32 x 1 1 4 2 983 120 Lockwasher 710 2 981 405 Screw Set Sq Hd 3 8 16 x
10. Automatic Hot Melt Gun Model AD 28 Part 106 992A NORDSON CORPORATION e AMHERST OHIO e USA 42 14 00 CORPORATION Amherst Ohio 4400 TECHNICAL PUBLICATION CONTENTS Title Page 2 w E 4 42 14 0 Contents Page 2 4 e 00 Description a ak amp Specifications gt s EO w o 1 Ancillary Equipment 4 o Gun Assembly Drawing G 1 2 Theory of Operation a o 3 lhstalldHiOM a 5 e oe 3 Operation 1 d B a 4 Trouble Shooting Chart amp amp amp FS 5 Maintenance and Electrical Repair a 6 Disassembly 4 5052 5 7 0 5 xw 2 7 Redssembly 46 OE amp LX 0 8 Electrical Data a 4 4 5 9 Exploded View 2 ko 3 A HN 2 10 Parts List E 3 i Ro de 004 CH TEC 11 Service Parts List P x ie 4 de g 2 Optional Parts List WM 8 5 we 12 LITHO U S A ISSUED 1 77 SUPERSEDES CORPORATION Amherst Ohio 44001 TECHNICAL PUBLICATION 42 14 1 AUTOMATIC HOT MELT GUN MODEL AD 28 Part Number 270 651 D NORDSON CORPORATION Vordson 5
11. amage to the bellows Insert the bellows 13 with its O ring 14 through the upper end of the lower body until the tip appears at the lower end of the body Place the spring 12 over the bellows and position the upper body 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 the gun thermostat 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 assembly 5 on the bellows until the air piston rests against the top of the upper body Then back the air piston off 1 4 to 1 2 turn Use the locknut 6 to secure the assembly on the bellows stem Place the air cylinder gasket 4 on the upper body position the air cylinder 3 over the gasket and secure the air cylinder to the upper body with four screws and lockwashers Torque each screw to 25 30 inch pounds 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 U S A 1 77 SUPERSENFS CORPORATION
12. lows or the cartridge heaters remove the four oval head screws from the lower end of the gun Doing this will free the ball seat 19 the lower body 17 and the sleeve 18 from the upper body 8 4 Now the spring 12 bellows 13 O ring 15 and support washer 16 are free 5 ball tip 21 that is attached to the bellows 13 is removed by threading it off the bellows Be certain to hold the bellows by the flats on the upper end when removing the ball tip Following this procedure will eliminate damage to the bellows or threads NOTE The ball tip 21 and seat 19 must be replaced as a set Use P N 241 109 LITHO U S A ISSUED 1 77 SUPERSEDES COPYRIGHT C 1977 NORDSON 42 14 8 CORPORATION Amherst Ohio 44001 TECHNICAL PUBLICATION DISASSEMBLY Continued ISSUED The thermostat is attached to the lower body by two fillister head screws When replacing the thermostat 26 be certain to replace it with the correct temperature rated thermostat Refer to the Parts List for temperature ratings and part numbers REASSEMBLY See Figure 6 insert the cartridge heaters 25 the lower body 17 Attach the thermo stat 26 to the block with two screws Place the bellows support washer 16 and O ring 15 in the upper end of the lower body Thread the ball tip 21 on the bellows using Locktite 740 on the threads Hold the bellows by the flats on the upper end when threading the ball tip on to avoid d
13. o optimum standards the AD 28 automatic gun should kept clean and free from contaminants and charred adhesive The gun should be cleaned on a regular basis Loose electrical connection Defective heaters Wear safety gloves P N 902 514 and eye protection when handling hot parts u d Ajajns 8 ing a cleaning solvent other than Type R Always follow the solvent s caution regarding safe use Do not use an open flame device to heat the gun or its components Damage caused by extreme heat may result Cleaning solvents may be caustic toxic or a fire hazard Use care when select gt Do not use drill or broach to clean a hot melt nozzle Use a piano wire probe and a flameless heat gun to clean hot melt nozzles Electrical Repair The AD 28 contains two electrical components a preset thermostat with a built in heat limiter and two cartridge heaters The thermostat may be checked and replaced quickly after removing the gun s electrical enclosure NOTE When replacing the thermostat be certain to replace it with one of the same temp erature rating The two cartridge heaters may be checked after removing the electrical enclosure To replace the heaters the gun lower body must be separated from the rest of the gun LITHO U S A ISSUED 4 78 2 SUPERSEDES 1 77 CORPORATION Amherst Ohio 4400 TECHNICAL PUBLICATION 42 14 7 MAINTENANCE Continued NOTE Before separating the
Download Pdf Manuals
Related Search