Pressure mechanical and electrical control system based on PLC

1 introduction in order to meet the requirement of modern industrial production efficiency, must design a more efficient, more intelligent, more security press of digital control system. Numerical control ( 数控) In modern developed a kind of automatic control technology, is to use digital signal to control the machine movement and machining process of a kind of method. This thesis combined with the network configuration, and visual man-machine interface, programmable controller PLC controller and use digital control technology to design a set of electric control system simple small press. The principle of control system design 2. 1 small press process principle of mechanical press working principle is to use the slider-crank mechanism, the circular motion of motor into the reciprocating linear motion of the slider, so as to realize the processing of stamping parts. Mechanical press is widely used on engineering and manufacturing of a forging equipment, it can be now all the forging technology of manufacturing, such as sheet metal blanking, forming, heat and cold extrusion, powder metallurgy, etc. Forging technology is able to achieve artifacts are of good quality and less material consumption and the advantage of high productivity [ 1] 。 2. 2 control system architecture of this small press electrical control system of three-phase 380 v, 50 hz power supply, the main arrangement in the electric control cabinet, electric control system of operation buttons and instrumentation is focused on the right front button on the site of the post, press the operation the work schedule in the mobile button. Press, a total of four move button respectively inserted in the press after the left front, left, right, right rear pillar bolt on the box, the user can according to the actual need operation or only one of them at the same time, need not move button stations is in short circuit plug. Press control system is the core of Siemens, omron CS series programmable controller and the PILZ ( Peel. Safety relay. Application of industrial Ethernet communication technology, electric control cabinet, pit, control station and beams with operation station and slide block. As shown in figure 1 to press the principle diagram of the control systems. Reserved communication interface of HMI, communication frequency of 100 mbit/s. 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, has the mould height, automatic air cushion stroke adjustment etc. Figure 1 press control systems division principle in figure 2. 3 small press PLC control system of electric automation system application of omron CS1H programmable controller as the core of the system control unit, two omron guide rack installed in electric cabinet, with internal cables to connect two parts articulated module [ 2] 。 Figure ( 2) The principle diagram of the PLC programmable controller structure. CS series programmable controller PLC is a medium size, by putting a program into several tasks to improve the efficiency of programming, and has a processing quickly, high capacity, multiple ports support agreement macros, and other significant characteristics of excellent level 3 network seamless communication, at the same time to make it as FA controller is the core of the ability to deal with high-level information flexibly. A CPU rack consists of a CPU unit, a power supply unit, a CPU motherboard, basic I/O unit, special I/O units, and CPU bus units. The optional serial communication board and memory card. Install module includes digital quantity input/output module, temperature module, analog input/output module. All electrical control signal input into the PLC, and then through the central processing unit to carry on the comprehensive summary signal processing, such as: press shaft temperature detection by normal PT100 platinum temperature measuring body temperature can be real-time monitoring flywheel bearing, overtemperature main motor stop, in order to protect the mechanical mechanism. When the temperature of the shaft is too high, through the axial temperature sensor signals, to the CPU for processing, in the program for temperature alarm setting instruction, after processing by the program, programming good man-machine interface, good corresponds to an address in the man-machine interface of the program, and through the man-machine interface question temperature real-time monitoring and feedback; And lubrication as place out eventually to signal processing program through question real-time monitoring lubrication times and time intervals. Figure 2 contour structure programmable controller PLC programmable controller of main characteristics are as follows: high reliability has a strong anti-interference ability, can work under the bad working environment. Does not require the cooling fan, air conditioning and does not require special power supply. Resistant to vibration and impact, at the scene of the workshop can be used directly; Simple and easy to modify, change, easy to master; Flexible component structure to install, easy to expand, the price is appropriate; Longevity and low power consumption, but for the lithium battery storage, power loss, the program can be retained; Small volume, light weight, small occupied space; Have complete self-diagnosis function, easy to check the maintenance. 2. 3 the main motor speed control system of press speed regulating device for the main motor G120 control, can meet the fine-tuning, stroke ( Single, inching, continuous) Different needs. In the condition of fine-tuning, main motor speed operation, and can be positive and negative to the operation, and stroke number 1 - 7 times/min; And in the condition of stroke, main motor can only be positive speed, continuous state, corresponding stroke number eight Continuous 20 times/minutes. Use pressure unit, should avoid frequent start-stop main motor.
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