Design of PLC control system for automatic packagi

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Design of PLC control system for automatic packaging of plate stacking three

③ three stations connected by servo machines, and the actuator of each station is mostly completed by the cylinder controlled by electromagnetic direction. Therefore, insufficient air pressure in the cylinder, loose mechanical limit and its accidental faults will affect the work completion of this station, delaying the action time, which will lead to stacking, turnover and blocking of the conveying section. Therefore, in the design, time monitoring and fault alarm can be set for each cylinder that must be in place. The servo system is composed of Ohm odc-1001 and Panasonic dv80x, and is programmed and controlled by teaching method

ohm i/o signal interface has 48 terminals in total. We adopt the open collector control mode, and use twisted pair shielded wire to lead the pulse output terminal to the CN i/f terminal of dv80x to control the pulse and pulse symbol input. At the same time, the program selection terminal Cha CHB and the start signal are led to the terminal and connected to the output module of PLC as the program selection channel signal of servo. Select standby as the end signal of servo program and connect it to the input module of PLC. When PLC receives this signal, it can carry out other actions on the production line. In addition, we draw a return to origin signal from the PLC output end, so that the servo machine can find the origin again due to negative tolerance after the specified program. The reflective photoelectric switch is selected for the origin signal, so that the total cumulative error is within m, which can meet the accuracy requirements. In the selection of switching power supply, the capacity of servo 24V power supply should not be too small and should be used separately. It should be strictly distinguished from PLC 24V to avoid interference. Therefore, PLC should also pay attention to this problem in the selection of modules, try to avoid waiting and mix the signal of setting long-term training programs with other signals in one module. At the same time, priority can be given to the use of PLC modules with independent com terminals. Servo control program (inc mode programming) is as follows:

step1 dim= (0000.0000

step2 pos=+787.9800


speed= from nothing to 100


step3 pos=+42.00001



slope= the role of lubricating oil on the testing machine 30

step4 pos=+12


step6 end

step7 rtn

step8 end

the main equipment of the plastic packaging section is a continuous resistance furnace, and its temperature control is mainly composed of two parts: sr-73pid temperature control Meter and solid-state voltage regulator (or pac03a three-phase voltage regulator controller). The temperature control meter inputs analog quantity through K-type thermocouple and outputs VDC voltage to control three solid-state relays SSR (or directly control pac03a three-phase voltage regulating controller), and each solid-state relay (or controller) is brought into the heating tube respectively. The output of solid-state voltage regulators is controlled by potentiometers, and each solid-state voltage regulator is also equipped with several heating tubes. General control of temperature control meter and solid-state voltage regulator 3. The experimental method of regular impact tester is completed by PLC. In this way, the temperature in the plastic sealed furnace can be fully controlled by sections, the pressure can be adjusted by sections, and the temperature can be controlled at about 180 ℃ by sections. The packaged box can be plastic sealed. Other actions in this section, such as box pushing, sealing and cutting, film releasing, etc., are controlled by PLC

IV. conclusion

building board is a relatively popular new building decoration material. However, due to the structural characteristics of decorative board: large area, small volume, vulnerable edges and corners, fragile surface, etc., the packaging of its finished products has become an urgent problem to be solved. At present, most of China's building materials enterprises use manual packaging, which leads to high labor intensity and no guarantee of the quality of finished products. Since the automatic packaging line was put into use in this enterprise, the above problems have been basically solved, the qualified rate of finished products has been greatly improved, and the number of workers on the production line has been reduced by nearly 3/4, which has been highly praised by users

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