System Equipment Anatomy Analysis of Plastic Granulator

Plastic granulator control system includes heating system, cooling system and process parameters measurement system, mainly by the electrical, instrumentation and implementing agencies. Below we will plastic granulator / system is divided into six areas for anatomical analysis: ① screw speed control: Screw speed regulation and stability of the host drive is one of the important process requirements. Screw speed directly determines the amount of plastic and extrusion speed, the normal production always want to maximize the maximum speed and achieve high output, the extruder screw speed required from starting to the required working speed, the available speed range to be large . And the stability of the speed of the high demand, because the speed fluctuations will lead to fluctuations in the amount of extrusion, extrusion quality, so no change in the traction line speed, it will result in changes in cable diameter. Similarly, such as traction device line speed fluctuations can also lead to changes in the cable diameter, screw and traction line speed can be reflected by the corresponding instrument on the console, extrusion should be closely observed to ensure high quality and yield.
② pressure control of the extruder: In order to reflect the head of the extrusion situation, the need to detect the extrusion head pressure, as the domestic extruder without head pressure sensor, the screw extrusion is generally measured after the thrust substitution Head pressure measurement, screw load table can correctly reflect the size of the extrusion pressure. The fluctuation of extrusion pressure is also one of the important factors causing the unstable quality of extrusion. The fluctuation of extrusion pressure is closely related to the extrusion temperature, the use of cooling device, the duration of continuous operation and other factors. When anomalies occur, the rapid exclusion can be ruled out and the production shut down must be reorganized. This not only avoids the increase of wastes, but also prevents the accident from occurring. By testing the pressure gauge readings, you can know the plastic pressure state in the extrusion, the general take the thrust limit alarm control.

③ plastic granulator temperature control: wire and cable insulation and sheathing of plastic extrusion is based on the deformation characteristics of thermoplastic, making it in a viscous flow state. In addition to requiring external heating screw and barrel, spread to the plastic to melt out, but also consider the screw extrusion plastic itself, the heat, so the host requires the temperature should be considered from the overall, it is necessary to consider the heater to open and Off, but also consider the screw extrusion heat outflow of factors to be cooled, there must be effective cooling facilities. And requires the correct and reasonable determination of the location of the thermocouple measurement components and installation methods, from the temperature readings accurately reflect the actual temperature of each section of the host. As well as the requirements of precision temperature control and system with the good, so that the host temperature control system stability of the volatility reached a variety of plastic extrusion temperature requirements.

④The electrical automation control: This is to achieve high-speed extrusion production line should have the process control requirements, mainly: boot temperature interlock; work pressure protection and interlocking; extrusion, traction two components of the proportion of synchronous control; Take-up and traction synchronization control; OD on-line detection and feedback control; according to various needs of the components of the stand-alone and machine tracking control.
⑤ winding tension control requirements: In order to ensure the line under different wire-speed, from the disk to the work of a constant tension requirements, I hope to receive a cable storage line tension adjustment mechanism, or consider the electrical constant speed System and constant tension system winding and so on.
⑥ outside diameter control: In order to ensure the size of the product cable diameter, in addition to the requirements of the control core size tolerances, the extrusion temperature, screw speed, traction device line speed and other aspects should be controlled and guaranteed, while the outer diameter Measurement control is a comprehensive reflection of the above control accuracy and level. Extrusion machine equipment, especially high-speed extrusion line, should be equipped with on-line diameter detector, at any time on the cable to detect the diameter, and the feedback signal to adjust the over-tolerance traction or screw speed, correct the outer diameter Very bad.