Introduction: Blister machine (also called thermoplastic molding machine) is to add heat-plasticized PVC, PE, PP, PET, HIPS and other thermoplastic coils into various shapes of high-grade packaging boxes, boxes and other products. machine. The current common products are: daily necessities blister packaging, hardware blister packaging, automotive supplies blister packaging, electronic products blister packaging, food blister packaging, cosmetics blister packaging, computer peripherals blister packaging, toy blister packaging, Sports goods blister packaging, stationery, blister packaging. Its requirements for the control system are to ensure easy operation, high precision of mechanical action and temperature control, short production time, and to save mechanical power consumption as much as possible under the same production conditions.
Blister machine works: Blister molding, also known as thermoplastic molding, this molding process is the use of the vacuum pump vacuum suction heating softened after the PVC, PET, PETG, APTT, PP, PE, PS and other thermoplastic plastic sheet The material is blister molded into various shapes of vacuum cover, plastic tray, bubble shell and so on.
Its main structure is composed of feeding, drawing, upper and lower electric heating furnace, lower gate, multi-functional adjustable size, lower mold plate, upper mold, upper gate, knife gate, slicing, placing piece and equip with vacuum device; Pneumatic device is the main power source. Its puller, upper die, lower die, and cutter use electric, screw drive, intermediate relays, travel switches and other electrical appliances to form a fully automatic control system.
Huichuan System Architecture: Huichuan automatic plastic machine control system uses 10.4 inch HMI touch screen, H2U 3232 PLC plus seven 16-point output module to control 112 electric furnace heating block heating, 1KW servo drive cutter action, two 5.5KW servo Drive the upper and lower molds separately; a 3KW servo control system moves the sheet.
Process requirements: According to the process requirements of the control system, the system needs to control four servo operations, in which the upper mold servo, the lower mold servo and pull-table servo operation accuracy requirements are 0.05mm. At the same time, when the PLC is controlling the heating of the electric furnace, it is necessary to control the heating in the form of PWM, which is convenient for meeting the demand of different temperature control in the same time when different products are produced. In order to facilitate customers to produce different products, the process parameters of their production need to be preserved.
Inovance Control Solutions: According to the customer's actual process requirements, we used the IS620P series servo and H2U 3232MTQ PLC plus seven 16-point output module control and 10-inch IT5100T HMI to complete the customer control requirements.
1) Through HMI's recipe function, the customer's production process parameters are all saved under the formula. The stand-alone HMI can save up to 32 groups of recipes. At the same time, our HMI also supports the USB storage function, and the data can be saved in mass through the U disk.
2) Through the servo operation position mode, precise positioning control function can be realized. Through the actual measurement of the site, our control accuracy can reach within 5 pulses.
3) The adjustable pulse output is realized by the PLC timing pulse and counter. The reference procedure is as follows:
4) By holding the register and counter off the power supply, the system can be automatically processed under the unmanned operation of the automatic mode. When the production is completed, the system will automatically stop running and alarm. The reference procedure is as follows:
Live picture:
Conclusion: The system uses full servo control, compared with the traditional cylinder and inverter control system, the system control accuracy has been improved; improve the product's molding quality; also reduce the system's noise; canceled the timer, reduced The cost of the system.
When the PLC controls the servo by pulse, it needs to do pulse interference processing work. If it is handled improperly, it will directly affect the servo control precision, and it will also affect the device structure. Therefore, we recommend using shielded twisted pair as the control.
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