Mechanical press control system design based on PLC

1 introduction of industrial robots, programmable controller and numerical control machine tool known as the three pillars of automation industry, now has been widely applied in various fields of industrial production. Machine tool is one of the indispensable equipment in the machinery manufacturing, its all kinds of mechanical transmission system and electric control system of precision fitted to guarantee of normal or overfulfilled work more effectively. And only in the optimization of the update of PLC in the control system design, can promote the vigorous development of a manufacturing I, make the machine tool control level to the next level. Figure 1 2 principle of mechanical press control system control principle diagram can be seen in figure 1, PLC is the core of the control system, the input signal for the sensor and proximity switch, button, trip switches, CAM switches, hands output operation station, pressure switches, liquid level switch, etc. ; The output signal to control the intermediate relay, contactor, solenoid valves, lights. To fine tune, inching, single, continuous preset schedule control; Timing control and monitoring, who will take care of the lubrication system. Can control of hydraulic overload protection of peace weighing apparatus of wind pressure monitoring of automatic adjustment and control; And use the CAM to achieve a single repeat. Simplifies the system structure, useful for the control and monitoring of press and to improve the safety performance is analyzed. Press is placed in the exposure of the external environment, the surrounding environment temperature should be in - 5 - 40 ℃ and ensure that the environment is dry, well ventilated, acid and alkali corrosion. Press has the necessary chain operation, instructions, and safety protection, comply with GB5226 - 2002 'machine tool electrical equipment general technical conditions' and JB3350-83 'mechanical press safety technical conditions'. The whole control plan 3 3 system. 1 press control system hardware system design is the core of omron CJ2M - CPU33 programmable controller, D netcom TAB, 2 safety relay ( PZHZ X4P,PNOZ X2. 8页) RS -, OMRON 422/485 option board, power supply module, I/O control unit, 0. 7 m connecting cable, I/O interface unit, temperature control unit, the analog module, relay output module, dc input unit, bus module, DeviceNet communications module, etc. Are installed in the electric control enclosure. To facilitate the machine operation and maintenance, on the operation panel except equipped with necessary indicator light is also equipped with PRO - FACE GP4501TADW touch screen, the rated voltage DC24V screen size 10. 4 inches, the working condition of main control circuit is used to indicate press and parameter Settings, such as control pressure, loading mode parameters such as height, air travel. The press adopts a series of mechanical and electrical integration technology, main motor adopt ac frequency conversion motor, schedule control and other auxiliary motion control application of the electronic CAM switch, have lubrication frequency detection function, can be displayed on the touch screen key number of lubricating oil supply points; Application of digital measurement and control technology, with die height adjustment function. PLC controller and frequency converter connection, the pressure of the flywheel and transmission system by the rated voltage AC380V, rated frequency 50 hz three-phase asynchronous motor. PLC through Ethernet local area network communication frequency converter, set by the tag name docking with the address of the packet of frequency inverter speed control and the actual current velocity feedback and start to stop, the monitoring of three phase line voltage current. Ethernet standard topology is always linear topology, is a kind of computer LAN technology. IEEE IEEE802. 3 standards formulated the standard Ethernet technology, including the physical connection, electronic signal, and the content of the medium access layer protocol. Node docking faster, more stable, more precise and effective accurate work in the industrial environment. PLC and touch screen connection, also using Ethernet communication, make touch screen screen monitor the corresponding address information and change various parameter values. DeviceNet is Allen - by the United States Bradley company manufacturing a automation technology of fieldbus standard. PLC to carry D network module, PLC controller through D netcom inquiry module connection electronic CAM and the Angle indicator, real-time monitoring of the slider. Figure 2 is a network communication. Figure 3 and figure 4 is I/O address allocation table, operation station by wiring diagram and schematic configuration of hardware wiring, the principle diagram and the wiring diagram is given. Figure 2 network communication diagram in figure 3 key input operation station address allocation table figure 4 double valve control output address assignment 3. 2 hardware communication configuration ( 1) Because inverter chosen AB755 series inverter, and omron PLC communication need EDS files, the first frequency converter and PC with Internet connection, set up the common IP network segment, using Rs - Linx installation EDS files, scan converter node, set the IP address of the inherent. Then using OMRON Network in software Configurator to realize communication through the EIP. Scan network node set membership, read on.
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