With Emerson PLC manufacture precision control cutting machine

This article will Emerson EC20 series PLC applied to the liner cutting machine, by receiving text display information and high speed input signal of encoder, using high speed output to drive the servo amplifier and communication control of frequency converter, so as to realize the precise control of noodles cutting length. When system process liner has just produced, is not as short as we see at ordinary times, but the length is about 1. 3 meters long, so in order to fit for people's consumption and convenient transportation, needs to be cut to length appropriate segments. Long before surface cutting requires human to be hung on the side bar, through the main conveyor belt hook will face after the rod and long face into the equipment. Cutter back-end proximity switch sensing plane rod arrived, control cutting knife cut surface and dry noodles from, while the liner has been a guide surface roller pressure continues to travel forward. Cutter continued cutting noodles, fixed time or length after stop, wait for the next bar. Noodles cutting machine main drive is 3. 7 kw motor, by Emerson inverter speed control; Cutter for servo motor drive, controlled by the servo amplifier; Equipped with text display at the same time, is used to set the section length and the monitor equipment status; Drive bearing with omron 1000 line incremental rotary encoder; For Emerson EC20 - core control agencies PLC。 Technology demands length: cutting out the noodles from 100 mm to 400 mm in length, can adjust the minimum in the range of 1 mm, allowed error of plus or minus 2 mm. The main motor speed: in order to energy saving, when each row a few face, need to motor frequency reduction, until the minimum set speed; When each successive a few face, need to slowly increase the frequency of the motor, set until the highest speed. Cutter action: due to the double edged cutter model, so every time cutting action to turn a half circle, and cutting speed is too slow, to prevent the noodles in the cutter short pile up. Cutting dao: noodles for a fixed length, fixed liner single long case, number of each rod surface cutting knife is fixed. But the knife number within less than the actual value should be adjustable, because sometimes the back part of the long there may be problems such as bending, cannot be made as finished product. At the same time, the rest need recycling renewed growth, so you need to break. Electrical system structure and the whole system of electrical structure diagram as shown in the black line represents the data stream, the arrows represent the data transfer direction. Text display using the MODBUS protocol communication with EC20 PORT0 communication port, including PLC as from the station. Master station sent a bar length, the length information of the main manufacture cutting single long, cutting knife, manual/automatic switch, etc. ; From the station information including the frequency converter, has been cutting knife number, the total surface pole number counting, etc. The inverter and the EC20 PORT1 communication port using free port communication agreement. In the operation of the PLC to send messages of start, stop, frequency converter, frequency set three command, specific time and to send the cycle by the program logic control. A, B two encoder will trust number into the PLC X0 and X1, respectively. PLC application high-speed count function of the encoder signal count, after internal calculation and transformation to determine when to drive servo amplifier. Servo amplifier is connected to the PLC controller high-speed output terminal Y0, is output by PLC high-speed pulse frequency and determine the number of rotational speed and the location of the cutter. Length of the realization of the process control: the encoder signal access length in order to realize the precise control of PLC controller, in fact just put the corresponding relation between encoder and noodles length can be found. Measured through programming experiment, ten rod liner encoder number issued by the pulse is 70610, and through the actual measurements of each side span length of 1527 mm, the available per mm corresponding pulse number 4. 624. So just set length times four in the program. 624, when required by the high speed counter to the cutter movement. Main motor speed setting: the process if direct implementation, according to requirements of the original program modification is larger, the difficulty is how to determine the 'continuous'. If the time interval to determine the concept of continuous, in the case of fixed rotational speed is ok. But after a couple of 'continuous', the other for increased speed, the corresponding time interval will also change, this request is used to determine the 'continuous' time scale also to continuous variation, and the change of time interval and the change of the frequency converter is not completely, the linear relationship between the problem more complicated. This is a kind of approximate method of use: every plane pole coming that increase the frequency, and a certain period of time without surface rod close to the lower frequency signal. Experimental results of this method is roughly the same as the user requirements. Cutter action: the action of cutting knife is controlled by the servo amplifier, measured by the program that needs to receive half a revolution of the 17173 pulse ( A knife is a double edged) 。 Cutter speed problem: actually you just need to find the highest conveyor belt speed when the corresponding rotational speed of the blade and maintain proportionate relationship between them can be realized without accumulation of noodles. Through in-situ test, on conveyor belt speed reaches the highest, cutter servo receives the best pulse frequency of 90 KHZ.
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