Twin screw extruder equipment problems
Twin screw extruder equipment problems, this article can help you solve 80%Everyone doing production knows that the machine is the lifeblood. Once the machine fails, it will affect the production efficiency, ranging from a brief shutdown to find the cause of the failure, and the line will be stopped, which will affect the production capacity of the day. None of the company's departments hope that the machine will fail Yes, so today we simply sorted out the 11 fault causes and analysis of the twin-screw extruder. If I can give a little help to my friends, I will be satisfied.
1. The main motor cannot be started
Reason 1: The driving procedure is wrong.
Solution: Check the procedure and restart the vehicle in the correct driving sequence.
Reason 2: There is a problem with the main motor thread, and whether the fuse is burned.
Solution: Check the main motor circuit. Check whether the lubricating oil pump is started, and check the status of interlocking devices related to the main motor. The inverter induction power is not discharged, turn off the main power supply and wait for 5 minutes before starting. Check whether the emergency button is reset.
2. The main motor makes abnormal sound
Reason 1: The main motor bearing is damaged.
Treatment method: replace the main motor bearing.
Reason 2: One of the SCRs in the main motor SCR rectifier circuit is damaged.
Treatment method: check the silicon controlled rectifier circuit, and replace the silicon controlled element if necessary.
Third, the host current is unstable
Reason 1: The feeding is uneven.
Treatment method: Check the feeder and eliminate the fault.
Cause 2: The main motor bearings are damaged or poorly lubricated.
Treatment method: repair the main motor and replace the bearing if necessary.
Reason 3: A certain section of heater fails and does not heat.
Treatment method: Check whether the heaters are working normally, and replace the heaters if necessary.
Reason 4: The screw adjustment pad is wrong, or the phase is wrong, and the component interferes.
Treatment method: Check the adjustment pad and pull out the screw to check whether the screw interferes.
Fourth, the head pressure is unstable
Cause 1: The speed of the main motor is uneven.
Treatment method: check the main motor control system and bearings.
Cause 2: The speed of the feeding motor is uneven, and the feeding amount fluctuates.
Treatment method: Check the motor and control system of the feeding system.
5. The temperature rise of the main motor bearing is too high
Cause: Poor bearing lubrication. The bearings are badly worn.
Treatment method: check and add lubricant. Check the motor bearings and replace if necessary.
Six, the machine head is not smooth or blocked
Reason 1: The heater does not work in a certain section, and the material is poorly plasticized.
Solution: Check the heater and replace if necessary.
Reason 2: The operating temperature is set low, or the molecular weight distribution of the plastic is wide and unstable.
Treatment method: verify the set temperature of each section, and negotiate with the technician if necessary to increase the temperature setting value.
Reason 3: There may be foreign objects that are not easily melted.
Treatment method: clean and check the extrusion system and the machine head.
Seven, the extrusion volume suddenly dropped significantly
Reason 1: The feeding system malfunctions or there is no material in the hopper.
Treatment method: Check the material level of the feeding system or hopper.
Reason 2: The extrusion system enters the hard object and jams the screw, so that the material cannot pass through.
Treatment method: check and clean the extrusion system.
8. The starting current of the main power is too high
Reason: insufficient heating time and high torque. A certain section of heater does not work.
Treatment method: Use a handcart when driving. If it is not easy, extend the heating time or check whether the heaters of each section work normally.
Nine, the lubricating oil pressure is low
Reason 1: The pressure setting value of the lubricating oil system pressure regulating valve is too low.
Treatment method: check and adjust the pressure regulating valve of the lubricating oil system.
Cause 2: The oil pump is malfunctioning or the suction pipe is blocked.
Treatment method: check the oil pump and oil suction pipe.
10. The automatic screen changer is slow or ineffective
Reason 1: Low air pressure or oil pressure.
Treatment method: Check the power system of the screen changer.
Reason 2: Air leakage (or oil leakage) from the cylinder (or hydraulic cylinder).
Treatment method: Check the sealing of the cylinder or hydraulic cylinder.
11. The safety pin or key is cut off
Cause: The torque of the extrusion system is too large.
Treatment method 1: Check whether there are metal or other objects in the extrusion system that are stuck in the screw.
Treatment method 2: At the beginning, check whether the preheating temperature increase time or temperature increase value meets the requirements.
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