Emerson EC10 series PLC in the application of the double screw plastic extrusion pelleting machine

Nanjing sharp navigation technology co. , LTD. Cheng Zhinong abstract: Emerson PLC through communication with heating instrument communication, to achieve material and extrusion system temperature control in the processing of other logic control and analog to realize the automatic control of the whole system and provides a friendly man-machine interface. 1, host a mainframe extruder by extrusion, transmission, heating and cooling system composed of three parts. , extrusion system is mainly composed of screw and machine barrel, is a key part of the extruder; Play a role, the transmission system is driven screw, make sure the screw in the process of work have the required torque and rotational speed; Heating, cooling system is mainly to ensure that materials and extrusion system temperature control in the processing. 2. Auxiliary extrusion equipment of auxiliary components according to the types of products. Generally speaking, auxiliary by the agent through setting device, cooling device, traction device, cutting device, as well as products of the coiling or storage device parts, such as. 3. Control system of extruder control system is mainly composed of electrical, instrumentation and actuator, its main function is: ( 1) Control of main, auxiliary engine drive motor, the speed and power required by meet the technological requirements, and ensure the main, auxiliary engine can run harmoniously. （ 2) Control of main, auxiliary engine temperature, pressure, flow rate and the quality of products. （ 3) Realize the automatic control of the unit. , plastic extrusion machine control points 1, 2 pieces of barrel, divided into multiple zones, respectively, accurate temperature control, heating/cooling can be two-way control, control accuracy + / - 1 ℃, the temperature can be displayed and modified. 2, feeder, the host can speed control, and display the current, speed and other parameters. 3, melt pressure and transfinite alarm display. 4, the system state real-time monitoring, various formula parameters real-time modification. 5, the system must have the perfect protection, when the abnormal situation such as seen in current automatic protection device. 6, according to the technical requirements to realize interlock and logical control. Three, system configuration, main PLC the Emerson EC10-1 1614 bra1, integrated two road 12 bit analog input and a 12 bit analog output. EC10 - another extension 4 AD and EC10 - analog input module 4 da analog output module, the system can provide 16 road 14 way switch on-off input, output, 6, 5 analog input analog output. 2, temperature control, temperature control by temperature control module independently, built-in heating/cooling double PID arithmetic, and supports RS485 serial communication function, connected to the PLC communication port COM1, using free communication protocol for data exchange, can read all the actual state of temperature, heating/cooling and displayed on the touch screen, and can modify the temperature set point, the PID parameters such as the touch screen. 3, speed control: host, feeding issued by Emerson EV2000 / EV1000 series frequency converter speed regulating control, unique magnetic flux vector control technology, 0 of motor. 5 hz when 180% of the starting torque, and ensure the precision of speed in 0. Less than 5%. Can be arbitrary change speed, the touch screen through the analog output module converted to 0 10 v analog signal is given to the inverter, it can realize accurate speed for a given host, feeder. At the same time frequency converter parameters such as current, rotational speed through feedback to the PLC analog input module, and on a touch screen for display and transfinite alarm protection control. 4, stripping pressure showed that 4 - pressure sensor output 20 ma analog signal, directly connected to the PLC controller analog input interface, converted to digital quantity after pressure value can be shown, and can be set on the touch screen to overpressure alarm alarm value. 5, the man-machine dialogue interface: selects 10. 4 'true color touch screen and PLC COM0 communication connection, adopts the MODBUS serial communication protocol for data exchange, can real-time display the running state of the system, to control system equipment operation, and it can display the system run data, alarm, content, modification process formulation, etc. 6 and interlock logic control: EC10 step series PLC program capacity is 12 k, instruction processing speed 0. 3 us, according to system perfect logic control program in a technological requirements. 4, the control system features: 1, the built-in two serial communication port, can communication with touch screen and other external devices at the same time. 2, the main PLC controller built-in analog input and output, high cost performance. 3, the system can be extended to 128 largest analog way switch quantity and 19 road, good expansibility. 4, large data capacity, can store multiple sets of formula parameters and other production. Five, summarize the application of nanjing some polymer equipment company is a professional engaged in twin-screw plastic extrusion granulation equipment research and development, production and sales of the company, the widespread adoption of Emerson EC10 PLC controller control system, has the very high cost performance, and stable and reliable, well received by customers.
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