The large crusher working at the mine site can reach 10,000 tons of crushed ore per day. The operating current of the motor can vary from 25 to 220A, and the starting current can be as high as 1500A. The crusher and its power controller are in a harsh environment, each This kind of noise and electromagnetic interference are serious. In addition, the power control is also related to the size of the ore block and the hardness, humidity, and viscosity of the ore, which puts higher requirements on the controller. To this end, the author uses a programmable controller (PLC) that can withstand harsh environments to complete the task of the computer part of this system.
Software implementation The key problem of software implementation is to solve the algorithm problem. The general PID algorithm, its proportion, integral, and differential coefficients are more difficult to set. Although many methods have been proposed in the literature, they are not ideal. At present, the better one is the "critical proportionality adjustment method" which appeared in the 1970s. This method requires several critical tests. The commonly used Fuzzy control algorithm is first attached to the figure of the crusher power controller hardware block diagram ore particle hydraulic servo system speed control feeding system ore block crusher material level sensor dial display alarm sp dial self-made motor current sampling interface circuit "Machinery Industry Automation 》 The correct membership function should be given, and then a series of membership degrees can be obtained according to the membership function and some related calculations. The membership degrees take values ​​in intervals, and they are made into a fuzzy control table with 7 rows and 10 columns. This fuzzy control table, regardless of the accuracy of D / A, always divides the output of the computer into more than 10 levels. For example, a 7-row 13-column control table divides the output into 13 levels. The level difference is large, and the accuracy is not High, if there are more levels, the control table will increase, causing inconvenience. A practical fuzzy control algorithm is adopted, which is called the microcomputer control algorithm of unsteady automatic control system.
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