Plastic granulator production line control system includes heating system, transmission system, cooling system and process parameter measurement system, which is mainly composed of electrical appliances, instruments and actuators (i.e., control panel and workstation). The main function of the plastic particle machine control system is: control and adjust the main auxiliary drive motor, the output of speed and power to meet the process requirements, and can make the main auxiliary coordination; Plastic molding machines for testing and adjusting temperature, pressure and flow; Realize the control or automatic control of the whole device.
The electrical control of the extrusion device is roughly divided into two parts: drive control and temperature control, which realizes the extrusion process including temperature, pressure and cooling.
1. Plastic granulator production line temperature control
Plastic wire and cable insulation and sheath extrusion are characterized by viscous flows based on thermoplastic deformation. In addition to the requirements of plastic particles machine screw and external heating bucket, plastic melt extrusion, and the spiral extrusion of plastic heat itself, the temperature requirements of the host should be considered from the overall, therefore, should not only consider the heater heating open and close, but also consider the cooling of hot screw factors. Plastic granulator requires correct and reasonable determination of the position and installation method of the thermocouple of the measuring element, and the reading of the temperature control instrument can reflect the actual temperature of the component. The precision of the temperature control instrument and the system should be well matched. The stability of the temperature control system of the whole plastic granule machine can meet the requirements of the extrusion temperature of various plastics.
2. Plastic granulator production line screw speed control
Plastic granulator adjusting screw speed and stability is an important technical requirement for host transmission. Screw speed directly determines the number of products and speed, normal production to achieve high yield need to achieve as far as possible the speed required by the work of plastic particle machine screw speed requirements. Because the fluctuation of speed will lead to the fluctuation of impact extrusion quality, the cable diameter will change if the traction line speed does not change.
3. Plastic granulator production line diameter control
As mentioned above, in order to ensure the cable diameter of the product, in addition to the control line core (core) dimensional tolerance, extrusion temperature, screw speed and traction device, the control line speed and outer diameter measurement should also be ensured. In the plastic particle unit equipment should be at any time to test the cable diameter, through the feedback of the error signal to adjust the traction or screw speed, out-of-tolerance of the correct diameter.
4. Plastic granulator production line was required to obtain roll tension control
In order to ensure that the coil is taken down at different line speeds, constant tension is required for the work from the empty disk. It is hoped that the tension adjustment mechanism of the storage line of wiring equipment can be received, or the electrical system considering constant line speed and constant tension winding can be considered, etc.