![]() The electrical signal is connected to the forward rotation start signal of the frequency converter, the clamping and backing relay signals are connected to the reverse start signal of the frequency converter, and the corresponding relationship between the external relay signal and the positive and negative rotation signal of the frequency converter is shown in Figure 5.Ģ.2 Variable frequency design ideas of injection molding machine Injection molding machine control system PLC external input side, output side wiring distribution diagram as shown in Figure 4.īonding injection molding machine variable frequency control process, mold opening, seat feeding, glue injection following The control system adopts the mainstream PLC products of Mitsubishi CorporationįX3U-32MR / A, 16 input / 16 output, in order to make the control system more intuitive, in addition to the four hardware buttons of the normal allocation of PLC input address, in the MCGSE configuration software also assigned virtual component M address, in order to configuration visual control. 1 System Hardware Design System adopts Mitsubishi FR with higher application rate -740 frequency converter, frequency converter main circuit wiring as shown in Figure 3, in which the mold opening and closing is an electric machine control system, seat advance and seat retreat is an electric machine control system, corresponding to the positive and negative rotation of the electric machine, M1-M3 respectively corresponds to the mold opening and closing motor, seat advance and retreat motor, glue shooting motor.The electromagnet uses the frequency changer to manufacture, its other components still uses the electromagnetically operated valve control system, through the electromagnetism valve, the middle relay has realized the injection molding machine other technological control, based on the frequency change and the PLC configuration control system plan as shown in Figure 2. The four movements of mold closing, plastic injection, seat entering and seat back, and mold opening are required to change speed. ![]() The controller adopts PLC, and the peripheral of PLC is equipped with on-off type input and executor type output. ![]() The control system adopts an machine interface HMI based on MCGSE software. (3) the injection molding technology (3) mainly has the following aspects: mold closing, seat injection, injection glue, seat withdrawal, mold opening, lwm yam., in which the four stages of mold closing, seat entry, seat withdrawal, glue injection and mold opening have the difference between high speed and low speed, and the specific operation process of the process is shown in figure 1. The main function of the txhaj tshuaj molding tshuab is to heat, inject and form the raw materials. Based on the limitation of speed control of traditional injection molding machine equipment, the part of injection molding machine which needs frequent variable speed can be changed into frequency conversion (2), which can realize the fast dynamic state adjustment of industrial technology, and effectively save energy, while the introduction of configuration control system can make the control more intuitive and flexible. The frequency converter can adjust the frequency flexibly and realize the flexible control of speed. The connection of the control system of the traditional injection molding machine is complex (1), which is inconvenient and flexible, and can not meet the production needs of multiple types of products. With the diversified consumption demand of plastic finished products in modern life, the production control of injection molding machine urgently needs to be adjusted by maneuvering. The parameters such as injection pressure can not be matched effectively and timely, so it is difficult to repair the system in the event of failure. As the equipment for the production of plastics, the processing action of txhaj tshuaj molding tshuab often has sudden change in speed, the steady setting of shadow sound preparation is used, such as injection glue, seat and so on, which require good variable speed performance, but the traditional injection molding machine depends entirely on the control mode of hydraulic electromagnet, and the hardware and circuit are complex. Plastics are widely used in various industries.
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