Views: 19 Author: Site Editor Publish Time: 2023-05-22 Origin: Site
The operation of plastic pelletizing machines involves a wide range of the national economy. It is not only an indispensable and basic production link for a large number of industrial and agricultural products but also an important source of environmental pollution in China. Therefore, the progress of plastic granulator technology is closely related to the development of the national economy. Here we introduce the cooling system and control system of the plastic pelletizing machine.
Cooling System
Control system
Screw pelletizing machine manipulation system
The plastic extruded in the plastic pelletizing machine layer formed by the cooling device should be cooled and shaped immediately after leaving the head, otherwise, it will be deformed under the action of gravity. The cooling method usually uses water cooling, and according to the different water temperatures, divided into rapid cooling and slow cooling. Rapid cooling is the direct cooling of cold water. Rapid cooling of plastic extrusion layer sizing is beneficial. But for crystalline polymers, due to sudden heat cooling, easy to internal residual stress in the extrusion layer organization, resulting in the use of the process of cracking, general PVC plastic layer using rapid cooling. Slow cooling is to reduce the internal stress of the product. In the cooling water tank of the plastic pelletizing machine, sections were placed in different temperatures of water, so that the product gradually cooled down and shaped PE and PP extrusion on the use of slow cooling. That is, after hot water, warm water, cold water three cooling.
The control system of a plastic pelletizing machine includes a heating system, cooling system, and process parameter measurement system, which is mainly composed of electrical appliances, instruments, and actuators (i.e. control panel and operation table).
Its main functions are to control and regulate the dragging motors of the main and auxiliary machines. The output speed and power follow the process requirements, and can make the main and auxiliary machines work in coordination; to detect and regulate the temperature, pressure, and flow of plastic in the extruder; to realize the control or automatic control of the whole unit.
The main role of the twin-screw plastic pelletizing machine manipulation system is to achieve the manipulation of the extruder screw speed ratio, barrel temperature and melt pressure, and other technical parameters in the extrusion technology. At this stage, the main options are the surface manipulation system and the PLC manipulation system.
Single-screw plastic pelletizing machine said that the functions between the two are: temperature manipulation of the surface manipulation system can achieve control switch two manipulations. The use of intelligent surface to achieve simple proportional manipulation, while the PLC manipulation system can be based on analog communication to achieve PID manipulation.
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