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1. The safety door is not closed.

• Problem: The machine displays an error message during spraying if the door is not completely closed.

• Troubleshooting: Close the safety door completely and turn off the error message before attempting the spraying operation again.

2. The injection signal is either absent or always present.

• Software testing: Access the I/O Output page (F4)> F4) . Check the signal pins: 04 (Inject) and 05 (Inject Back). Perform a manual output to test the indicator lights on the motherboard.

• Voltage check: Measure the valve output signal (pin D100 for injection and D101 for reverse injection). The standard voltage must be 24V.

• Switching contacts (if faulty): If pin 04 is faulty, you can switch to the backup pin (e.g., pin 29) by going to page F6 and entering the password.1234 Press F3 to change the port address, then swap the corresponding signal wires on the motherboard.

3. Stuck fuel injector or pressure valve.

• Check the coil: Use a multimeter to measure the resistance between the two terminals of the coil. The normal value is approximately 21 Ω . If there is no resistance or the value is too high, the coil needs to be replaced.

• Inspect the valve body: Disassemble and clean the valve. Note: Remember the correct positions of the internal components when reassembling. If cleaning is ineffective, the valve needs to be replaced.

4. Low temperature or presence of foreign objects.

• Temperature: Check the type of plastic being used and set the appropriate temperature on page F8 . Ensure a minimum heating time (usually 10 minutes or longer depending on the type of plastic) for the plastic to melt completely.

• Foreign objects: If there is an unusual noise during spraying, there may be metal or foreign objects in the screw shaft. It needs to be disassembled for cleaning and removal of the foreign objects.

5. Worn screw shaft or missile head assembly

• This is due to mechanical wear and tear after prolonged use. If the above steps are ineffective, the wear should be checked and the screw shaft or rocket head assembly replaced.

If you encounter any difficulties during the process, you can contact Haitian Vietnam’s technical department directly for assistance.

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1. The safety door is not closed.

• Problem: The machine displays an error message on the screen during the material loading process.

• Procedure: Check and completely close the safety door before loading.

2. Fueling signal is malfunctioning.

• Test: Go to the I/O Output page (F4) to manually test the feed signal (usually point 06 ).

• Troubleshooting: If node 06 is faulty (no signal or always outputs a signal), switch to an unused node (e.g., node 29):

  • Go to page F6 , enter your password.1234 , select F3 to change the node number (Original: 6, New: 29).

  • Next, swap the corresponding signal wires at the electrical panel (motherboard).

  • Check that the power supply to the valve is at least 24V .

3. Stuck fuel intake valve or pressure valve.

• Check the coil: Use a multimeter to measure the resistance between the two terminals of the coil. The normal value is approximately 21 Ω . If there is no resistance or the resistance is too high, the coil needs to be replaced.

• Inspect the valve body: Disassemble and clean the valve body thoroughly. If it still doesn’t work after cleaning, the valve must be replaced.

4. Low temperature or foreign object in the barrel.

• Temperature: Check the type of plastic being used and reset the melting temperature accordingly. On page F8 , you can adjust the heating time (usually 10-30 minutes).

• Foreign object: If there is an unusual noise coming from the puller barrel, there may be metal or a foreign object inside. It needs to be disassembled for cleaning and removal of the foreign object.

5. Clogged funnel neck or worn screw shaft.

• Clogged funnel neck: The screw rotates but cannot extract the adhesive because the resin is stuck in the funnel neck. The solution is to clean and unclog the funnel.

• Worn screw: The resin has seeped through but the sealant isn’t taking hold. The screw wear needs to be checked and replaced if necessary.

6. Motor or feeder failure

• Symptom: There is an unusual noise coming from the base or the 5-star motor.

• Troubleshooting: Disassemble, inspect, identify the faulty internal components, and proceed with replacement.

If the above steps don’t resolve the issue, you should contact Haitian’s technical support department for more in-depth assistance.

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• Open the electrical cabinet: Open the protective box and disconnect the signal connectors attached to the AK668 (or equivalent) circuit board.

• Cleaning: Use a brush and compressed air to remove dust and dirt from the circuit board before in-depth testing.

2. Circuit board repair process

• Identify the faulty component: Measure and test the output signal control system for heating section 4. The fault is usually in the small signal switching components on the circuit.

• Replacing components: * Use a heat gun and soldering iron to remove the damaged component.

  • Clean the solder joints thoroughly using flux or specialized circuit cleaning fluid.

  • Solder the new components into the correct positions, ensuring a secure solder joint with no short circuits.

3. Install and reconnect.

• Installing the circuit board: Place the circuit board back in its original position and tighten the retaining screws.

• Wiring: Reconnect all signal jacks. Pay particular attention to checking the heating control signal wires (section 4) to ensure good contact.

4. Operational testing

• Turn on the machine and observe the display on the control panel.

• Check the signal output status at the heating page. If the error has been corrected, the temperature of section 4 will begin to rise and display a normal operating status.

Repairing circuit boards requires precise soldering skills. If you are not confident, you should contact the technical department for professional replacement or repair assistance.

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• Moldless machine: Clean the jaw surface thoroughly and apply anti-rust oil to protect the metal surface.

• The machine is currently clamped: Clean the mold and perform mold closing at low pressure (do not use high pressure). This helps avoid jamming of the clamps or difficulty in opening the mold after a long period of inactivity.

2. Clean the puller barrel and screw shaft.

• Cleaning the plastic: Use PP or PS plastic scraper to clean the barrel, pushing out any remaining raw materials or flammable plastic inside.

• Screw position: After cleaning, move the screw back to its maximum position . This helps prevent any remaining plastic from burning during the next heating cycle.

• Cooling system: Close the coolant valve on the puller barrel and use an air hose to clean out any accumulated water.

3. General cleaning and cleaning of electrical cabinets.

• Cleaning the machine body: Wipe away any dust, dirt, and grease adhering to the machine body.

• Safe cleaning of electrical cabinets:

  • Turn off the power and wait 15 minutes before opening the electrical cabinet to ensure that the electronic components have discharged completely, thus ensuring the safety of the circuit.

  • Use a dry cloth to wipe away dust and use an air blower to remove dust from hard-to-reach areas.

  • Moisture and insect protection: Place additional desiccant bags and seal the electrical cabinet tightly to prevent component oxidation or damage to wiring caused by rodents.

4. Conclusion

• After completing the above steps, proceed to turn off the main circuit breaker (CB) of the machine to completely cut off the power.

Following this procedure correctly will help keep the machine in optimal condition and ready to resume operation whenever needed.

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• Mechanical inspection: Examine the bolted connections of the phase wire, neutral wire, and especially the ground wire (PE) to ensure they are secure.

• Continuity testing: Use a multimeter to check the continuity of the system.

• Insulation test: Inspect the motor at the inverter by measuring the voltage, voltage, and current (U, V, W) between the U, V, and W wires, and each wire against ground to ensure there is no short circuit to the casing.

Step 2: Turn on the power switch and check the parameters.

• Protection check: Check the condition of the circuit breakers (CPs) or fuses that protect the heating element.

• Voltage specifications: Before switching on the main power, measure the voltage to ensure that the voltage between the phase wires is 380V and the voltage between the phase wires and the neutral wire is 220V .

• Screen startup: After closing the CP, observe the startup screen. If there are any error warnings, address them immediately. Ensure that the electronic gauges are displayed stably.

Step 3: Check the heating system.

• Temperature setting: Set the temperature appropriate for the type of plastic being used.

• Important note: After the screw barrel reaches the set temperature, it must be kept at that temperature for at least 30 minutes before operation. This allows the plastic to melt completely, reduces internal friction, and protects the lifespan of the screw shaft.

Step 4: Check operating conditions

• Check the safety conditions around the machine before starting it.

• Inspect the hydraulic oil system, lubrication oil level, and coolant system.

Steps 5 & 6: Manual operation and final check

• Perform the operations in manual mode to check the movements of the mold, screw, and jig for smoothness or any unusual noises.

• Check all other technical conditions before switching to automatic operation mode.

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• Impurities or iron particles get inside the puller barrel.

• The problem stems from the raw materials.

• The clearance between the screw shaft and the puller barrel is not up to standard due to geometric or installation errors.

2. Points to check and address

• Balance: Check and remeasure the balance of the machine body.

• Barrel play: Check if the barrel is tilting downwards due to improper installation.

• Cooling system: Ensure the cooling system nuts are tightened securely.

• Concentricity of the coupling: Check the concentricity of the coupling, ensuring it does not exceed the permissible standard.

• Drying time: Ensure a minimum cold start resistance time of 30 minutes when heating the puller barrel.

• Guide rails: Check the straightness and proper installation of the guide rails.

3. Technical adjustment process

• Using a feeler gauge: Use a 0.02 mm feeler gauge to check the narrowest points between the outer diameter of the screw shaft and the inner hole of the puller barrel (at 8 points on the support).

• Adjusting the rear support: * If the gap at the two lower left corners is small: Loosen the corresponding screws and adjust to press down or lift up.

  • The typical adjustment range is between 1.0 mm and 1.5 mm .

• Concentricity measurement: Use a center gauge to remeasure the concentricity of the frame and the puller barrel; the inherent error should be within 0.30 mm .

4. Post-adjustment check

• After making adjustments, conduct a test run of the system and spray at a slow speed.

• Ensure the machine runs smoothly and there are no unusual noises coming from the screw assembly.

If users encounter any difficulties during the process, they can contact Haitian Vietnam’s technical hotline for direct support.

The post Instructions on adjusting the clearance between the screw shaft and the barrel on the Haitian MA series machines. appeared first on Haitian International.

• Preparation: Move the scaffolding back to its final position.

• Disassembly: Remove the plastic protective caps and hexagonal screws on the rail.

• Secure the batten bar: Attach the batten bar to the rail and move the scaffolding close to the batten bar to secure its position.

• Disconnect: Remove the protective cover, sensor, and the screws securing the drum and cylinder.

• Operation: Turn on the rotating truss function on the control panel and press the button to rotate.

2. Replace the screw shaft.

• Heat preparation: Turn off heating elements 1 and 2, wait for it to cool down, then remove the heating ring.

• Removing the screw shaft: Remove the flange bolts in sequence, then remove the screw shaft tail and pull the screw shaft out.

• Installing a new screw shaft: Thoroughly clean and apply heat-resistant copper grease to the threaded ends. Then reassemble the flange, heating ring, and secure the mounting bracket.

3. Center the spray nozzle.

• Use calipers or a specialized measuring device to check the concentricity between the nozzle and the mold center hole.

• Adjust the alignment bolts at the base of the truss until the required accuracy is achieved.

Note: Always ensure workplace safety, wear heat-resistant gloves, and disconnect the power supply when necessary during maintenance.

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The parts that need to be prepared include:

• Screw and Barrel.

• Screw tip, collar seat, screw collar.

• Nozzle, Front Barrel.

• Hexagon bolts, hexagon plugs, and heat-resistant grease.

2. Install the three-piece screw head assembly.

• Assembly order: Assemble the push ring, retaining ring, and screw head together.

• Important note: The collar seat must be installed correctly to ensure a tight seal and prevent backflow. There are two standards: standard (angled) and flat, depending on the type of machine.

3. Install the screw input assembly.

• Apply heat-resistant grease to the threads of the screw head.

• Screw the head assembly onto the screw shaft counterclockwise and tighten with a specialized wrench.

4. Install the auxiliary parts on the puller barrel.

• Wrap heat-resistant Teflon tape around the hexagonal plugs and insert them into the holes on the puller barrel.

• Clean the contact surfaces between the drumstick and the drumstick cutting board thoroughly.

• Apply high-temperature grease to all flange tightening bolts.

5. Install the front barrel.

• Attach the puller chuck plate to the puller head and tighten the bolts by hand first.

• Tightening rule: Tighten bolts diagonally to ensure even pressure across the contact surfaces.

6. Completion

• Insert the entire screw shaft, with the head attached, into the puller barrel from the rear end.

• Apply heat-resistant grease and attach the nozzle to the puller barrel, then tighten it securely with a specialized wrench.

Adhering to the correct installation procedures and using heat-resistant grease will ensure stable machine operation and easy disassembly during subsequent maintenance.

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• General inspection: Visually inspect the machine for any unusual signs such as oil leaks or strange noises coming from the puller barrel and screw shaft.

• Lubrication and oil filtration system: * Check engine oil and lubricating oil levels.

  • Observe the oil filter pressure gauge; if the needle points to the red mark, the oil filter needs to be replaced immediately.

• Glue dispensing unit: Clean the nozzle, heating ring, temperature sensor, and check the screw connections.

• Leveling the machine: Check the balance of the machine frame and adjust the feet if the machine is unbalanced.

2. Electrical system maintenance

• Safety: Always turn off the power before cleaning the inside of the electrical cabinet.

• Cleaning the electrical cabinet: * Use an air hose to clean the ventilation fan and the inside of the cabinet. Note: Ensure all moisture is expelled from the air hose before blowing air onto the electrical circuits to avoid short circuits and fires.

  • Wipe clean with a dry cloth after blowing away the dust.

• Check connections: Manually inspect the tightness of electrical connections, valve connectors, and any wires connected by the customer.

• Voltage measurement: Use a multimeter to check the 380V, 220V, and 24V power levels to ensure stability.

3. Operational testing and finalization

• Motor: Remove the protective cover to check for oil leaks and listen for unusual noises when the motor is running.

• Safety system: Check the emergency stop buttons and door limit switches.

• Additional lubrication: Apply grease to the joints and bearings.

• Grounding: Inspect the grounding wire to ensure electrical safety for the operator.

Finally, after a final general check, the technician will affix a maintenance sticker to the machine to confirm the completion of the process.

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