1.Industrial Background

Plastic melting equipment is one of the core equipment in the plastic processing industry. It is mainly used to heat and melt plastic raw materials to provide uniform melt for subsequent molding processes. These equipment are usually composed of heating system, extrusion system, transmission system and control system, among which the screw speed of the extrusion system, the temperature control of the heating system and the stability of the transmission system are crucial to the plastic melting process.

2. Control Requirements

1） Process description:

The VFD can achieve stable control of the melt flow rate during plastic smelting by accurately controlling the screw speed. This helps to maintain the uniformity of the melt temperature and improve the quality of plastic products. The VFD can also be used to control the power of the heating system and adjust the heating rate according to the actual needs of plastic smelting, thereby optimizing energy utilization and reducing energy consumption.

2）Control requirements:

External terminal start and stop, potentiometer speed regulation, and interlocking with transmission and other systems to achieve fault shutdown linkage; strong overvoltage and overcurrent suppression ability in negative pressure state and high speed accuracy.

3.Wiring Diagram

4.Parameter Settings

      1#VFD

5.Photos at Site

6.Solution Features

• Improve production efficiency: The VFD can achieve precise control of the plastic melting process, thereby improving production efficiency. By optimizing the screw speed and heating system, the melting cycle can be shortened and the output can be increased.
• Energy saving and consumption reduction: The VFD can adjust the furnace fan according to actual needs to avoid unnecessary energy waste. In the plastic melting process, the VFD can achieve energy saving of 20%-60%, significantly reducing production costs.
• Enhance equipment stability: The VFD has excellent anti-interference ability and control accuracy, which can ensure the stable operation of plastic melting equipment under complex working conditions. This helps to reduce equipment failure rate and improve the overall reliability of the production line.

In summary, the application of VFD in plastic melting equipment has significant advantages. By accurately controlling the screw speed and optimizing the heating system and transmission system, VFD can improve production efficiency, save energy and reduce consumption, and enhance equipment stability. With the continuous development of industrial automation, the application prospects of frequency converters in the plastic processing industry will be broader. In the future, with the continuous innovation and upgrading of technology, VFD will bring more intelligent and automated functions to plastic melting equipment, promoting the sustainable development of the plastic processing industry.