Troubleshooting

Plastic extruder is the most common mechanical equipment for recycling waste plastics.

In the daily operation of the extruder, the extruder will inevitably have various failures that affect the normal production of plastic machinery. Below we will analyze some common faults that are both recorded.

Host current is unstable

1. Causes:

⑴ feeding is uneven. ⑵The main motor bearing is damaged or poorly lubricated. ⑶ A certain heater fails and does not heat up. ⑷The screw adjustment pad is incorrect, or the phase is wrong, and the components interfere.

2. Treatment method:

⑴Check the feeder to troubleshoot. ⑵Check the main motor and replace the bearing if necessary. ⑶Check that each heater is working properly and replace the heater if necessary. ⑷Check the adjustment pad and pull out the screw to check for interference.

Main motor cannot start

1. Causes:

⑴The driving procedure is wrong. ⑵There is a problem with the main motor thread, and the fuse is burned out. ⑶The interlocking device associated with the main motor functions.

2. Treatment method:

⑴Check the procedure and drive again in the correct driving order. ⑵Check the host circuit. ⑶Check if the lubricating oil pump is started and check the status of the interlocking device related to the main motor. The oil pump does not turn on and the click cannot be opened. ⑷Check if the emergency button is reset. ⑸The inverter does not discharge the induction power. Wait for 5 minutes after turning off the main power supply.

The machine head is not well discharged or blocked

1. Causes:

⑴A certain section of the heater does not work, and the material is not plasticized. ⑵The operating temperature setting is low, or the molecular weight distribution of the plastic is mad and unstable. ⑶There may be foreign matter that is not easy to melt.

2. Treatment method:

⑴Check the heater and replace if necessary. ⑵Verify the set temperature of each section and negotiate with the technician if necessary to increase the temperature setting. ⑶Clean and inspect the extrusion system and the machine head.

Main electric starting current is too high

1. Causes:

⑴The heating time is insufficient and the torque is large. ⑵A certain heater does not work.

2. Treatment method:

⑴Apply the hand truck when driving. ⑵If it is not easy, extend the heating time or check whether the heaters are working properly.

The main motor makes an abnormal sound

1. Causes:

⑴The main motor bearing is damaged. ⑵One of the main motor thyristor rectifier lines is damaged by a thyristor.

2. Treatment method:

⑴Replace the main motor bearing. ⑵Check the thyristor rectification current and replace the thyristor components if necessary.

Main motor bearing temperature rise is too high

1. Causes:

⑴bearing lubrication is poor. ⑵ bearing wear is serious.

2. Causes:

⑴Check and add lubricant.⑵Check the main bearing and replace if necessary.

The head pressure is unstable

1. Causes:

⑴The main motor speed is not uniform, the feeding motor speed is not uniform, and the feeding amount fluctuates.

2. Treatment method:

⑴Check the main motor control system and bearings. ⑵Check the feeding system motor and control system.

Lubricating oil pressure is low

1. Causes:

⑴Lubricating oil system pressure regulating valve pressure setting value is too low. ⑵The oil pump is faulty or the suction pipe is blocked.

2. Treatment method:

⑴Check and adjust the lubrication system pressure regulating valve. ⑵Check the oil pump and suction pipe.

Automatic screen changer is slow or not working

1. Causes:

⑴air pressure or low oil pressure. ⑵cylinder (or hydraulic station) air leakage (or oil leakage)

2. Treatment method:

⑴Check the power system of the screen changer. ⑵Check the seal of the cylinder or cylinder.

Safety pin or safety key is cut off

1. Causes:

⑴Extrusion system torque is too large. ⑵main motor and input oil pump bearing connection is different

2. Treatment method:

⑴Check the extrusion system for foreign matter such as metal to enter the stuck screw. At the beginning, check whether the warm-up time or temperature rise value meets the requirements. ⑵Adjust the main motor.