Emergency treatment method for failure of plastic processing equipment
In the long-term use of plastic processing equipment, there will be a variety of problems, such as the host can not start, the head discharge is not long or blocked, the motor current is unstable and so on. If not handled in time, it may lead to more serious faults of plastic processing equipment. Therefore, in order to help users solve their problems, let’s introduce the causes and maintenance methods of easy faults of plastic processing equipment. The specific contents are as follows.
Plastic processing equipment is prone to failure and maintenance methods:
Plastic processing equipment is prone to failure. 1. The main motor cannot be started: if the start-up sequence is wrong, check whether the fuse is burned; There is a problem with the main motor thread; The interlocking device related to the main motor works.
Maintenance method: start up again according to the correct start-up sequence, check the sequence, check the circuit of the main motor, and check the status of the interlocking device related to the main motor. If the oil pump does not open, check whether the lubricating oil pump is started. The motor cannot be turned on. Turn off the main power supply and wait for 5 minutes before starting. The induction power of the frequency converter is not discharged. Check whether the emergency button is reset.
Plastic processing equipment is prone to failure II: poor discharge or blockage of the machine head: poor plasticization of materials, failure of a certain section of the heater or wide molecular weight distribution of plastics. The operating temperature setting is low and unstable. There may be foreign matters that are not easy to melt.
Maintenance method: replace if necessary, check the heater, and negotiate with the technician if necessary. Verify the set temperature of each section; Increase the temperature setting value; Clean and check the extrusion system and head.
Plastic processing equipment is prone to failure III: uneven feeding caused by unstable host current, damage or poor lubrication of main motor bearing and no heating. The heater of a certain section fails or the phase is wrong, the screw adjusting pad is wrong, and the components interfere.
Maintenance method: eliminate the fault, check the feeder, and replace the bearing if necessary. Repair the main motor and replace the heater if necessary. Check whether each heater works normally, pull out the screw, check whether the screw interferes, and check the adjustment pad.
Plastic processing equipment is prone to failure 4: after the plastic is added to the hopper, it falls smoothly on the screw and is bitten by the screw thread.
Maintenance method: with the rotation of the screw, the screw is forced to move towards the machine head, forming a mechanical conveying process. When the plastic runs from the feeding port to the machine head, due to the gradual reduction of the thread depth of the screw and the existence of resistance such as filter screen, splitter plate and machine head, a high pressure is formed in the plastic plasticization process, which presses the material tightly, improves its heat transfer conductivity and helps the plastic melt quickly, At the same time, the pressure is gradually increased so that the gas originally existing between the material particles is discharged from the exhaust hole.
While the pressure increases, the plastic is heated by the outside on the one hand. On the other hand, during the movement of compression, shear and mixing, the plastic itself also produces a lot of heat due to the internal friction force. Under the combined action of external force and internal force, the plastic temperature gradually increases, and its physical state also experiences the changes of glass state, high elastic state and viscous flow state.
