In the application of mechanical and electrical products in plastic film production line

Abstract: this article mainly introduces the mechanical and electrical products ( Touch screen, PLC, frequency converter, temperature controller, etc. ) In the application of plastic film production line. The combination of HMI and PLC control system, and inverter and other automation products, friendly interface and simple operation, to achieve the upgrade technology with high efficiency and energy saving equipment. Stable and reliable system operation proved: in the product, control of high efficiency and is worthy of reference for the industry peers and promotion. Key words: in, frequency converter, PLC controller, man-machine interface, the thermostat 1 introduction in recent years, to adapt to the packaging industry for the requirement of packaging is increasing, the rapid development of the market a variety of functional membrane. Through two-way stretch production of plastic film can effectively improve the material tensile properties ( The tensile strength is 3 - not stretch film 5 times) , barrier properties, optical properties, heat, cold resistance, dimension stability, a variety of performance, such as thickness uniformity and have the production speed, large capacity, high efficiency, rapid development market. Current with the development of modern science and technology, has a broad market, plastic film equipment such as film packaging, medical and health care, penetration items, especially health and products of penetration, has a more strict requirements on products. Such equipment is mainly imported from Europe and the United States in the past, because of the high cost and maintenance cost, some domestic enterprises also begin to develop, the price is only about 1/10 of the imported equipment, the corresponding control level is uneven. In the face of increasingly complex requirements and corresponding production efficiency problem, based on the platform of the DVP series PLC and HMI and servo automation products, successfully implements a set of sets of mechanical and electrical products based plastic film production line automatic control system. This control system control core part full use in the product, including PLC, touch screen, frequency converter and temperature control table, etc. Complete machine contour diagram is shown in figure 1. Figure 1 machine contour map 2 manufacturing process control system and system background introduction of plastic film usually manufacturing process diagram as shown in figure 2, figure 2 plastic film manufacturing process diagram at first the factory adopts synchronous controller + inverter synchronous adjustment, PLC, frequency converter, synchronous device, temperature control table, and other products are not the same brand, use rise especially services more troublesome, after communication with customers and ultimately determine the use of frequency converter + PLC + touch screen + temperature control table for complete system solutions. 3 3 system solution. 1 system configuration control system technology scheme of equipment configuration as shown in table 1, table 1 control scheme of equipment configuration table above table only enumerate control system main components, low-voltage electrical appliances are also included in this ( Low voltage circuit breaker, electromagnetic contactor, electromagnetic relays, buttons, lights, etc. ) , detection sensor ( Proximity switch, trip switch, etc. ) , inverter communication cable, etc. , here are not here. 3. 2 control framework this equipment adopts RS232 communication between touch screen with PLC, considering station is more likely to affect the communication speed, so the temperature controller, inverter, PLC and touch screen respectively using RS485 communication connection, system control framework as shown in figure 3: figure 3 system control block diagram 3. Three control ( 1) The main monitoring picture first boot into the main monitoring picture ( As shown in figure 4) Here, all parameters can be set and watch the equipment data; , through the button, can be in accordance with the switch in figure 7 is variable frequency synchronization between in operation. Various frequency converter speed can be directly on the jump out to the small keyboard input digital, can also through the small pop-up window by up and down key for fine-tuning. The main monitoring picture (figure 4 system 2) Temperature setting and display the temperature setting and display, in the industry mostly USES the average temperature control instrument, original set and check the temperature when need to relevant personnel to run in the past, especially in the mold, cold water machine installed in the equipment above, every change Settings are climbing up and down, very inconvenient. This we have adopted in temperature control table with RS485 communication interface, all temperature setting and monitoring of information can be directly on the touch screen operation, and can be modified according to process requirements, at any time really convenient and quick. Figure 5 is the temperature setting and display; Figure 5 the temperature display and set your picture ( 3) System parameter images mainly work on the page with the main monitoring picture of frequency inverter speed correction parameters to set and modify, and can store different products production parameters, next time again the product production time formula can be directly call parameters, greatly saves time, and also reduce the waste of material. As shown in figure 6: system parameter Settings screen (figure 6 4) Process parameters images due to cancel the original use of synchronous controller, now all motor synchronization are given by the frequency converter after operation by PLC, this page can be set respectively each inverter speed proportional relationship. As shown in figure 7: figure 7 process parameter Settings screen winding length setting, by setting the parameters, can make the winding motor when reach the set length automatically, automatic cut off the original products, at the same time in above the scroll, in order to achieve the production line without stop in shaft of product.
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