plastic extruder fault, how to do?

Plastic extruder is a common plastic machinery equipment, in the daily operation of the process of the extruder, extruder will inevitably appear a variety of faults, affecting the normal production of plastic machinery, we will analyze the extruder fault in detail.

The current of the main engine is unstable

1. Production reasons: (1) Uneven feeding.

(2) Main motor bearing is damaged or badly lubricated.

(3) A section of heater fails to heat.

(4) Screw adjusting pad is wrong, or phase is wrong, element interference.

2. Treatment methods:

(1) Check the feeding machine and troubleshoot.

(2) Overhaul the main motor and replace the bearing if necessary.

(3) Check whether each heater is working normally and replace the heater if necessary.

(4) Check the adjusting pad and pull out the screw to check whether the screw interferes or not.

The main motor cannot start

1. Causes:

(1) There is a mistake in the driving procedure.

(2) There is a problem with the thread of the main motor, whether the fuse is burned ring.

(3) The interlocking device related to the main motor plays a role

2. Treatment methods:

(1) Check the procedure and start again in the correct starting order.

(2) Check the main motor circuit.

(3) Check whether the lubricating oil pump is started, and check the state of interlocking devices related to the main motor.

The oil pump won't start, and the motor can't start.

(4) Check whether the emergency button is reset.

(5) The induction current of the frequency converter has not been discharged, turn off the main power and wait for 5 minutes before starting.

Poor discharge or blockage of the nose

1. Causes:

(1) Some section of heater does not work, and the material is not plasticized properly.

(2) The operating temperature is set low, or the molecular weight distribution of plastics is wide and unstable.

(3) There may be foreign bodies that do not melt easily.

2. Treatment methods:

(1) Check the heater and replace it if necessary.

(2) Verify the set temperature of each section, negotiate with the technologist when necessary, and raise the set value of temperature

(3) Clean and check the extrusion system and machine head.

The main starting current is too high

1. Causes:

(1) Insufficient heating time and large torque.

(2) The heater does not work in a certain section.

2. Treatment methods:

(1) Use handwheel when driving. If it is not easy, extend the heating time or check whether the heaters in each section work normally.

Abnormal sound from main motor

1. Causes:

(1) Main motor bearing is damaged.

(2) A silicon controlled rectifier circuit of the main motor is damaged.

2. Treatment methods:

(1) Replace the main motor bearing.

(2) Check the SCR rectifier circuit and replace the SCR element if necessary