Control system operation of production line of plastic granulator
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Brief introduction of Chengdu plastic machinery operation of production line control system of plastic granulator
The control system of plastic granulator includes heating system, transmission system, cooling system and process parameter measurement system, mainly composed of electrical appliances, instruments and actuators (i.e. control panel and workstation). The main functions of the control system of the plastic granulator are as follows: the main auxiliary driving motor controlled and adjusted, the output of speed and force meeting the process requirements, and the main auxiliary coordination; the plastic molding machine for testing and adjusting temperature, pressure and flow; and the control or automatic control of the whole device.
The electrical control of extrusion device is roughly divided into two parts: drive control and temperature control, which realizes the extrusion process including temperature, pressure and cooling.
1. Temperature control of main machine of plastic granulator
The extrusion of insulation and sheath of plastic wires and cables is based on the viscous flow of thermoplastic deformation. In addition to the required screw and external heating barrel of plastic granulator, plastic melt extrusion, and the heating of the screw extrusion plastic itself, the main machine required by the temperature should be considered in general, therefore, not only the opening and closing of heater heating, but also the factors of cooling hot screw should be considered. The position and installation method of the thermocouple of the measuring element should be determined correctly and reasonably. The actual temperature of the component can be reflected from the reading of the temperature control instrument. The accuracy of the temperature control instrument and the system should be well matched. The stability of the temperature control system of the whole plastic granulator can meet the requirements of various plastic extrusion temperatures.
2. Screw speed control of plastic granulator
It is an important technical requirement for the speed and stability of the screw of the plastic granulator to be transmitted by the main machine. Screw speed directly determines the number and speed of products. In order to achieve high profits in normal production, it is necessary to achieve the speed required by screw speed of plastic granulator as much as possible. Because the fluctuation of rotation speed will cause the fluctuation of impact extrusion mass, it will cause the change of cable diameter without the change of traction line speed.
3. Diameter control of plastic granulator
As mentioned above, in order to ensure the size of the cable diameter of the product, in addition to the need to control the core (core) dimensional tolerance, extrusion temperature, screw speed and traction device, it should also ensure to control the line speed and outer diameter measurement. At any time, the outer diameter of the cable should be tested for the equipment of the plastic granule unit, and the traction or screw speed and the correct diameter of the out of tolerance should be adjusted through the feedback of the error signal.
4. The requirement of the roll tension control of the plastic granulator
In order to ensure the coiling at different wire speeds, constant tension is needed to work from the empty disk. It is hoped to receive the wire tension adjustment mechanism of wiring equipment, or consider the electrical system of constant wire speed and constant tension winding, etc.