CN2275260Y - Fuzzy frequency conversion controller for load of ore crusher - Google Patents

Abstract

The utility model relates to a fuzzy frequency conversion controller for load of ore crushers, which is composed of a control circuit which adopts a chip of an 8098 single chip microcomputer as a core, a storage circuit which is composed of ROM, EEROM, and RAM chips, a keyboard entry and number display circuit, and an interface circuit of multi-output and input. The technique of fuzzy logic control is applied by the controller, and the frequency of an output power supply of an alternating-current converter is adjusted timely by monitoring a load current of the crusher and simulating the experience of skilled operators, so the stepless speed regulation of a plate-feed-plate drive motor is realized so as to regulate material feeding speed and the load of the crusher keeps ideal working condition as much as possible. The controller can increase yield, save energy and protect equipment.

Description

Ore crusher load obscurity frequency-converting control device

The utility model relates to a kind of device that the single chip microcomputer chip is regulated electric variable of using, and exactly, relates to a kind of ore crusher load obscurity frequency-converting control device of using the nineties fuzzy logic control technology.This device is by detecting the high-voltage motor load of disintegrating machine; feed the machine rotating speed of motor through fuzzy logic control by AC converter step-less adjustment plate; realize the optimum control of ore crusher load, thereby realize increasing the purpose of output, energy efficient and protection equipment.

Ore crusher is to be used for ore is carried out the broken heavy equipment of processing.When ore enters factory, mostly be from the mine bulk raw that directly exploitation comes greatly, must make it to become the specification that meets technological requirement, can use for production line through the crusher in crushing operation.The ore reduction system normally forms (referring to Fig. 1) by board-like feeding machine 1, disintegrating machine 2 and feed belt 3 etc., promptly feeds machine 1 by plate ore is fed after disintegrating machine 2 carries out fragmentation, pours feed belt 3 again into and sends into production line.Because ore grain size difference is very big, plate is fed raw material size on the machine, hardness height and stacking situation and is had no rule, and randomness is very big, is difficult to traditional autocontrol method the disintegrating machine load be realized closed-loop control: in case overload, just make disintegrating machine " plug is dead ", have a strong impact on production; As because of the frequent trip protection of overload, the motor that frequent switching is started bears the impact of great start-up current and generates heat, so that burn, has also aggravated the wearing and tearing of plant equipment; As reduce plate and feed the machine operational throughput, just reduced unit-hour output, enterprise energy consumption is increased, labour productivity reduces.And the carrying out in order to guarantee to produce, common disintegrating machine all moves under underload or underload situation, causes a large amount of open circuit loss.How to bear under what condition in equilibrium rationally, the drive motor realization closed loop of ore crusher is controlled automatically, become an all unsolved at present scientific research difficult problem both at home and abroad, abroad some leading company is (as the little wild field of Japan, Mitsubishi, German O ﹠amp; K etc.) do not see that in this respect it has success to carry out the report of closed-loop control yet.

Fuzzy logic control is successful, a most practical current artificial intelligence control technology.The fuzzy mathematics birth comes from 60 generation of this century, receives various countries' control expert's concern, and from the nineties, has become one of hot spot technology of automation field.Fuzzy logic control can be in the occasion that is difficult to maybe can't set up mathematical model, and simulation manual control thought is carried out directly, rapidly, effectively control controlling object according to experience.When the experience of scientific and technical personnel according to the operator, sum up one group " if ... then ... " conditional statement of form, and the process control software that is compiled into of the arithmetic statement that will utilize this fuzzy logic inference, put in the fuzzy logic controller based on single-chip microcomputer, this controller just can possess whole abilities that the operator operates machines through fuzzy logic inference, and this controller operator's subjective mistake can not occur and make production run control optimization more, effective.

The good characteristic of fuzzy logic control is that also it need not to set up mathematical model (and mathematical model often is difficult to set up or can't set up at all in complication system) and just can realize the closed loop of system or equipment is controlled automatically.And structure of fuzzy controller is simple, and hardware is realized easily, and is with low cost; Be suitable for relying on people's intuition or experience to carry out manual occasion especially, anthropomorphic dummy's operation realizes control automatically.Therefore, fuzzy logic control in recent years obtains flourish: the household appliances of large quantities of fuzzy controls (as air conditioner, electric cooker, refrigerator, video camera etc.) are asked the city in succession and are well received; Industries such as the metallurgy in industrial circle, chemical industry, building materials, the application of fuzzy logic control has also obtained the achievement that attracts people's attention.

The purpose of this utility model provides a kind of ore crusher load obscurity frequency-converting control device, by this device the supervision of disintegrating machine load current is realized the fuzzy variable frequency control of plate hello dynamo-electric machine rotating speed, thereby increase unit-hour output, cut down the consumption of energy and prolong equipment life.

The utility model is achieved in that and includes casing, with the one chip microcomputer is control core circuit and output, input interface circuit, it is characterized in that: the single chip microcomputer chip model in the control circuit is MC8098, its storer includes: the technological parameter in the rom chip of storing process control program, the storing process control program, and can realize power down, the RAM chip of the intermediate data when preserving the EEROM chip of data and the work of storing process control program when resetting; Realize that keyboard interrupt, input and autoscan show that digital peripheral control unit chip is 8279; Its output/input interface includes: three road analog input interfaces, two-way solid-state relay output interface, and one the tunnel can realize PWM output interface and RS422 serial communication interface of D/A conversion; Above-mentioned output/input interface is all realized inside and outside two cover power supplys and serial connection photoelectric isolating device, to realize inside and outside electrical isolation.

The rom chip model of above-mentioned storage control program is 27256, and the EEROM chip model of storage technology parameter is 2817A, and the RAM chip model of storage intermediate data is 6264.

The utility model is a kind of fuzzy control device of developing at present domestic and international ore crusher inefficiency, this device is by the load current of monitoring disintegrating machine, adjust plate in good time and feed the machine rotating speed of motor, thereby adjust its rate of feeding, the load of disintegrating machine is remained under the ideal operation state as far as possible, realize Optimal Control.This device is a successful example of using fuzzy control technology, be difficult to, even may do not setting up under the operating mode of mathematical model, experience by the simulation skilled operators, realization is controlled automatically to the closed loop of heavy equipment, both improve equipment productivity and increased output, reduce energy resource consumption again, also prolong service life of structure.This device also is the new breakthrough of single chip microcomputer in Industry Control Application, simple, the realization easily of its hardware configuration, and with low cost, reliable operation can realize closed-loop stabilization control when changes in process parameters, having should general popularizing application prospect.

Fig. 1 is the position view of the utility model in the ore crusher device systems.

Fig. 2 is the position view of the utility model in ore reduction machine equipment electric system.

Fig. 3 is a casing profile stereographic map of the present utility model.

Fig. 4 is a control circuit block scheme of the present utility model.

Fig. 5 is single-chip microcomputer and a memory portion electrical schematic diagram thereof in the control circuit of the present utility model.

Fig. 6 is a peripheral hardware control section electrical schematic diagram in the control circuit of the present utility model.

Fig. 7 is an output/input interface circuit electrical schematic diagram in the control circuit of the present utility model.

Referring to Fig. 1, Fig. 2.The ore crusher device systems includes board-like feeding machine 1, disintegrating machine 2 and feed belt 3, the utility model is monitored as 4 pairs of disintegrating machine 2 load currents of fuzzy logic frequency-converting control device, change the output current frequency of three-phase alternating current frequency converter 5 by its output, thereby realize the intelligent stepless speed governing of plate hello dynamo-electric machine rotating speed.Wherein the utility model control device 4 and AC converter 5 start instrument such as protection equipment can pack into (shown in Fig. 2 dotted line) in the standard switch board with other.The utility model is by current transformer 23 electric current of disintegrating machine motor 21 to be introduced switch board, through load current converter 22 its working current is converted to the standard signal of 4-20ma again, carry out non-contact detection and be input in the utility model, as the foundation of fuzzy logic control.

Referring to Fig. 3, Fig. 4, the utility model includes casing 41 and with control circuit, the output/input interface circuit of single chip microcomputer chip core, wherein the single chip microcomputer chip model in the control circuit is 8098; This chip has 10 A/D conversion input interfaces of multichannel and a plurality of timer, also can be connected to the output of PWM (D/A) and RS422 serial port, and order set is abundant, is desirable Industry Control single-chip microcomputer.Its memory circuit includes: the rom chip 27256 of storing process Control work program, the technological parameter of setting in the storing process Control work program, and can realize power down, the RAM chip 6264 of the intermediate data when preserving the EEROM chip 2817A of data and the work of storing process control program when resetting.The controller chip 8279 that also has peripheral hardware work such as supervisory keyboard and charactron can realize that keyboard interrupt, input and digital autoscan show.The input and output interfaces circuit includes: one tunnel pulse input and the three kinds of simulating signal input channels in scene that can send into 0-5V, 0-10ma and 4-20ma respectively; Two-way solid-state relay output SSR, the output of No. one electromagnetic relay RELAY, one road PWM output can realize the D/A conversion, and output signal can be any of 0-5V, 0-10ma and 4-20ma.Other has the RS422 interface to realize serial communication, and its communication distance can reach 1200 meters.

The electrical schematic diagram of the utility model control circuit can see Fig. 5, Fig. 6 and shown in Figure 7 for details.In order to guarantee under industrial environment normally steady operation, the utility model has been taked some special measures on anti-interference.At first the output/input interface circuit all adopts inside and outside two cover insulating power supplies and uses photoelectric isolating device, makes the inside and outside electrical isolation fully of the utility model control circuit, to get rid of external interference.In addition, 8098 chips power up with manual reset circuit on, make it to produce precipitous rising (decline) edge, it is correct to guarantee to reset.Also on 8 data lines of 8098 chips all and connect a 100K resistance to+5 volts, can be in reset mode (because of the machine code of 8098 reset instructions is FFH) when the work that makes it is wrong.

The utility model accomplishes that in order to satisfy the field demand of Industry Control the output/input interface signal form is various on the output/input interface circuit, and conditioning is convenient and circuit structure is simple.Referring to Fig. 7, its analog input interface can be three kinds of 0-5V, 0-10ma and 4-20ma, and wherein 0-5V voltage signal input circuit is: earlier through R1, C1 filtering, disturb to eliminate extraneous spike pulse; The linear light that constitutes through U1 (LM358) and U2 (optocoupler TLP521) and R2, R3, R4, C2 makes the voltage signal of input be converted into the voltage signal internally with respect to CPU every circuit again, to reduce and to avoid the influence of external interference to control circuit CPU.This voltage signal is adjusted to the required voltage (4.5V) of 8098 inner A/D conversions through low-power consumption amplifier U3 (ICL7611) amplification again.Other forms of signal condition method is: the 0-10ma current signal is formed the 0-5V voltage signal, the above-mentioned same input circuit of going further through R5.The 4-20ma current signal is formed voltage signal through R6, through the amplification of R7, C3 filtering and amplifier U4, also walk above-mentioned same input circuit after the translation again.Wherein can make this circuit be fit to the input of various ma level current signals by adjusting potentiometer W1, W2.

The output interface of CPU8098 has one the tunnel can the adjustable pwm signal of output pulse width, this pwm signal is isolated through optocoupler V5 (6N137) light earlier, the active secondary filtering circuit of forming via U6, U7 (high input impedance CA3140) again, make pwm signal through voltage signal output level and smooth, that become 0～5V after amplifying, amplifier U8 (LM358) then makes the voltage drop on R8, the R9 follow output voltage signal to change; Transistor T 2, T3 constitute complex pipe and have big voltage amplification factor, can form constant electric current output.As long as adjust output voltage as required, just can obtain required current signal.And this circuit output impedance is very little, its current signal output impedance≤500 Ω when 4～20ma exports.This output interface can directly link to each other with the AC converter input end.

The utility model has been developed model machine, and is installed to running test in the limestone crushing system of cement mill.This cement mill disintegrating apparatus is from external introduction, and unit-hour output is 240 tons, and the traction electric machine that its plate is fed machine is Δ/YY double-speed motor.When originally using, disintegrating machine often is in underload or crosses the sanction state, and actual unit-hour output has only 180 tons, and often burns motor because of frequent pole-changing control.After the utility model is installed, adopt fuzzy controller monitoring disintegrating machine motor load, the control AC converter changes output frequency, thereby control panel is fed machine drive motor rotating speed and is carried out closed-loop control, through the long-play test, when disintegrating machine control load setting rated load 85% the time, its unit-hour output reaches 240 tons, output improves more than 30%; Because of using the frequency control of contactless soft start, economize on electricity in a year just reaches 300,000 yuan, has also protected motor again.

Test is to utilize the utility model directly the three-phase alternating current frequency converter to be carried out fuzzy logic control when implementing, the power work frequency that changes plate hello machine drive motor is adjusted the disintegrating machine working load: when the load of disintegrating machine was lower than ideal value in a period of time, plate was fed machine and is just quickened automatically; When its load is higher than ideal value, just slow down automatically.Prescribe a time limit when load is lower than down, plate is fed chance and is carried at full speed, and sends alarm signal, tells to lack material on the field worker conveyer belt; Equally, when the disintegrating machine average load was higher than the upper limit alarm value, the plate machine of feeding also can suddenly stop and send alarm signal, waiting load to descend after, enter the adjustment state again automatically.Realize the Optimal Control of disintegrating machine load thus.During enforcement, two-way solid-state relay output interface SSR is used for the off signal that control panel is fed board motor and disintegrating machine motor, and another road electromagnetic relay output interface RELAY then is used to drive the warning electric bell.

Claims (2)

1, a kind of ore crusher load obscurity frequency-converting control device, include casing, with the one chip microcomputer is control core circuit and output, input interface circuit, it is characterized in that: the single chip microcomputer chip model in the control circuit is MC8098, its storer includes: the technological parameter in the rom chip of storing process control program, the storing process control program, and can realize power down, the RAM chip of the intermediate data when preserving the EEROM chip of data and the work of storing process control program when resetting; Realize that keyboard interrupt, input and autoscan show that digital peripheral control unit chip is 8279; Its output/input interface includes: three road analog input interfaces, two-way solid-state relay output interface, and one the tunnel can realize PWM output interface and RS422 serial communication interface of D/A conversion; Above-mentioned output/input interface is all realized inside and outside two cover power supplys and serial connection photoelectric isolating device, to realize inside and outside electrical isolation.

2, ore crusher load obscurity frequency-converting control device as claimed in claim 1, it is characterized in that: the rom chip model of above-mentioned storage control program is 27256, the EEROM chip model of storage technology parameter is 2817A, and the RAM chip model of storage intermediate data is 6264.

Images