Frequency control extruder What?

Host extrusion machine adopts frequency control process must take into account the pressure and velocity are two important technological factors. For pressure, the process requires some extrusion machine is mainly controlled outlet pressure constant, the device at the beginning of the work, carried out speed control, when it reaches the demand pressures, it is necessary to switch to the pressure control. The switching process should also be no impact, which requires the drive with very high control accuracy to collusion pressure signal, in order to achieve pressure PID control. For speed, extrusion rate is an important parameter describing extrusion machine extrusion process, which symbolizes the height of the size of machine productivity, factors affecting the rate of many, such as the nose resistance, screw speed, barrel structure, a constant pressure in the nose Under the circumstances, the most important is the screw speed. Therefore, the control constant screw speed no mutation is the most important. In the actual extrusion machine control process, often using closed-loop speed control with encoder. Today, technology has become increasingly sophisticated inverter control, it can generally applicable to the harsh working environment, using vector inverter control to achieve extrusion machine host transmission has become a trend. Current mainstream vector control speed control technology has the following characteristics: a wide speed setting range: without external feedback, the speed range can be set up to 1:50; 2 steady high speed precision: without external feedback, the entire debt the range, speed accuracy can be stable at 0.5%; 3 with a friendly user interface makes it easy to access a variety of automation systems; 4 has a powerful software tool for developers to complete drive system solutions. 5 When using vector control, can greatly provide high torque output at low frequencies. Extrusion machine main drive motor driven primarily by the screw rotation after the parallel shaft helical gear reducer gear for constant torque speed when changing speed or less at the fundamental frequency. The conventional use of V / f control type inverter compared to starting torque due to consider the load, to set the appropriate torque boost, if the torque boost set too high loads at low frequency excitation light will be too easily lead to serious motor heat, affect the stability of operation of the device. Therefore, the application range of the frequency converter vector control has been expanded to any Extruders fields.