PLC application in plastic packaging container injection moulding machine

PLC application in plastic injection moulding machine container zhuzhou institute of technology la-mei yan Yuan Youwei welcome to e exhibition hall 1 injection molding machine injection molding machine, vertical injection molding machine, second-hand injection molding machine, vacuum forming machine, foam injection molding machine,. 。 。 Abstract: this paper analyses the current plastic packaging container problems that exist in the injection moulding machine transmission device, points out the use of PLC control scheme, and gives the hardware design and software implementation method. Key words: automatic control system; Induction motor; Real-time control 1 introduction with the constant improvement of the packaging mechanization and automation level packaging actuator movement has become increasingly complex and changeful. Transmission mechanism is used to power and the working machine of the prime mover to the agency. At the same time in the process of transfer for the speed regulation of exercise transform (in the form of Continuous motion into rotary motion into BaiGong or mobile, periodic pulse movement, etc. ) 。 Its transmission device used in mechanical transmission, hydraulic transmission, pneumatic drive and electrical drive, etc. Transmission device is used for the engine output power and motion transmission, assigned to the actuator device, including all kinds of transmission, such as energy storage element. This article mainly introduced based on programmable controller ( PLC controller) In the plastic packaging container application of injection molding machine screw drive. 2 plastic packaging container injection molding machine screw transmission device of the working principle of the transmission device schematic diagram is shown in figure 1. The transmission device has two kinds of power supply, the induction motor 1 and 6 cylinder. When the preliminary model, according to the conditions of raw material plastication borrow a gearbox 2 have a variable to determine the required speed, and make the screw 5 one-way rotary and uniform back ( Backward speed depends on the piston back pressure) The compound movement; And when injection, make its produce by slow - Fast - Slower speed linear movement. The transmission device can barely meet the requirements of processing technology, dismantling and cleaning up the screw is also more convenient. However, the automation degree is not high, and stepless speed changing gear transmission 2 have certain speed is not constant. Because of the speed of the screw back at a constant speed of 5 only depends on the piston back pressure, the speed using the screw transmission device not well controlled. As a result, the plastic packaging container injection molding machine screw transmission device is characterized by a high degree of automation is not, and the speed of the screw can't get the precise control of faults, urgent need to improve. As a result, the plastic packaging containers in the injection molding machine screw drive device, need to adopt the advanced equipment and computer automatic control technology, to complete its process control. This paper mainly introduced the program controller ( PLC) The control system design and programming. 3 the system hardware design with the development of large scale integrated circuit, the microprocessor as the core of programmable controller obtained the rapid development of the programmable controller ( Programmable Controller, hereinafter referred to as a PC or PL) Is the logic operation, timing, counting and arithmetic operations such as control program stored in a string of instruction form to memory, and then according to the content of the storage, input and output components such as analog and digital on the installation of production equipment and production process control. PLC has been widely used in various fields, to meet the modern efficient, a large number of automation requirements of mass production. Such as motor start-stop, solenoid valve open and close, count, temperature, pressure and flow of the product set and speed control and so on. In this paper, design of PLC in the plastic packaging container injection molding machine screw transmission device, the application of the control system hardware is mainly composed of programmable logic controller ( PLC) , relays, power supply. Programmable controller ( PLC) Using OMRON CPM1A company - 20CDR— A model, basic unit I/O points is 12/8. Dc power supply provide power supply for input channel. The output of the PLC relay control external electric motor positive &negative switching. I/O address allocation is shown in figure 2:4 software packaging container design of plastic injection molding machine screw drive control system, control mode is a complex, high real-time requirements of control system. To the outside world parameters in real time measurement and deadlines in handling of these parameters, as well as the corresponding rotational speed, displacement, torque, pressure on the gas in real-time control. The whole process is a process in real time, system can complete multiple tasks at the same time. According to the technical requirements, and maintainability at the same time, considering the convenience degree, the degree of the following diagram, as shown in figure 3. 5 conclusion by adopting PLC to control, effectively avoid the screw rotation movement too fast or too slow, as well as the required speed linear motion can not meet the requirement of the process of faults. Using PLC controller control plastic packaging container, injection molding machine screw drive system, reasonable structure, complete functions, convenient operation, high reliability and good speed control features, can fully meet the requirements of processing technology. This system has the promotion of practical value.
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