ZhangJiaGang Antron Machinery,Co.,Ltd

Characteristics of plastic granulator and common fault repair


Characteristics of plastic granulator and common fault repair


Plastic granulator Features: After the plastic is added to the hopper, the hopper falls smoothly onto the screw and is bitten by the screw thread. As the screw rotates, the thread is forced to advance toward the head to form a mechanical conveying process. When the plastic is running from the feeding port to the machine head, the thread depth of the screw is gradually reduced, and due to the resistance of the filter screen, the manifold and the head, a high pressure is formed in the plastic plasticizing process, and the material is pressed. It is dense, improving its heat conductivity, helping the plastic to melt quickly, and gradually increasing the pressure to allow the gas originally present between the pellets to be discharged from the vent.
While the pressure is rising, the plastic is heated by the outside on the one hand. On the other hand, during the movement of compression, shearing and agitation, the plastic itself generates a large amount of heat due to the internal friction force. Under the combined action of external force and internal force, The temperature of the plastic is gradually increasing, and its physical state also undergoes a change of the glass state-high elastic state-viscous flow state.
Plastic granulators are prone to failures and repair methods:
Fault: The main unit current is unstable, resulting in uneven feeding, main motor bearing damage or poor lubrication, and no heating. If a certain heater fails or the phase is wrong, the screw adjustment pad is wrong and the components interfere.
Repair method: Troubleshoot, check the feeder and replace the bearing if necessary. Repair the main motor and replace the heater if necessary. Check if the heaters are working properly, pull out the screw to check the screw for interference, and check the adjustment pad.
Fault: The main motor cannot be started: the driving sequence is wrong, check whether the fuse is burned; the main motor thread has a problem; the interlocking device related to the main motor works.
Maintenance method: re-drive according to the correct driving sequence, check the sequence, check the main motor circuit, and check the status of the interlock device related to the main motor. The oil pump does not turn on and check if the lubricant pump is activated. The motor cannot be turned on, wait for 5 minutes after turning off the main power supply, and the inverter does not discharge the sensor. Check if the emergency button is reset.
Fault: The machine head is not well discharged or blocked: the material is not plasticized. A certain section of the heater does not work or the plastic has a wide molecular weight distribution. The operating temperature setting is low and unstable. There may be foreign matter that does not melt easily.
Maintenance method: Replace if necessary, check the heater, and consult with the technician if necessary. Verify the set temperature of each section; increase the temperature setting; clean and check the extrusion system and the machine head.

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