Common faults and solutions for PET bottle blowing-part 4

January 08, 2022

Q16: Alarm sounds

Reason:

The main motor current is too large, and the thermal relay overload current protection is cut off

Solutions:

check motor failure or adjust thermal relay overload current

Q17: Air switch adjustment

Reasons:

1. Short circuit of live wire and voltage regulating circuit

2. The motor burns out

Solutions:

1. If the switch is closed, it will trip. First disconnect the heating air switch, and then close it. If it jumps again, it means that the main circuit is short-circuited and grounded. Close the air switch one by one. When it is closed, it will jump. There is a problem with a voltage regulating circuit of this air switch, please check one by one

2. If the motor starts to trip, it means there is a problem with the motor branch circuit

Q18: The lamp does not light up

Reasons:

1. The voltage regulating circuit is damaged

2. The lamp filament is broken

3. The SCR is damaged or disconnected

4. The lamp tube is disconnected

Solutions:

1. Measure the voltage at both ends of the lamp with a multimeter ACV250 gear

2. If there is 220V, the lamp filament is broken, remove it, and recheck with multimeter R×1 file

3. If it is "0", check the corresponding voltage regulating circuit, first measure whether there is voltage output, and then whether there is voltage input, if there is input but no output, it is generally because the SCR is damaged or the potentiometer is disconnected.

4. When the potentiometer is adjusted, the indicator light changes in brightness, which can indicate that the thyristor is intact, and it is concluded that the lamp is broken

Q19: The stretch rod fails to rise and return to the original position after the mold is opened

Reasons:

1. The position of the magnetic pole switch is too low, and the piston of the cylinder does not pass the magnetic pole switch after the stretch rod reaches the bottom of the stretch position.

2. The stretching speed of the stretching rod is too fast.

Solutions:

1. First manually raise the stretch rod to its original position, and then adjust the magnetic pole switch to a higher position to ensure that the magnetic pole switch can sense the piston when the stretch rod reaches the bottom of the position.

2. Tighten the screw of the one-way throttle valve joint under the stretching cylinder clockwise to reduce the speed of the stretching rod. Note that changing the speed of the stretching rod may affect the blowing effect, which can be adjusted appropriately. The time setting of "delayed blowing" is matched to achieve the ideal effect of blowing when the stretch rod reaches the bottom of the bottle.

The above is the Common faults and solutions for PET bottle blowing-part 4 we have listed for you. You can submit the following form to obtain more industry information we provide for you.

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