CN102818615A - Control method, controller and control system for material metering, and mixing station - Google Patents
Control method, controller and control system for material metering, and mixing station Download PDFInfo
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Abstract
The invention provides a control method for material metering. The control method comprises the steps of: according to a frequency change control policy and a preset target material metering weight, calculating a weight value of materials which are conveyed by a material conveyor before a motor of the material conveyor shifts gear and changes frequency each time, wherein the frequency change control policy leads a work frequency of the motor of the material conveyor to increase from a non-highest frequency to the highest frequency gradually, and then to decrease from the highest frequency to the lowest frequency gradually; receiving weight of materials conveyed by the material conveyor which is obtained by a weight detecting device; when the weight of the materials conveyed by the material conveyor which is obtained by the weight detecting device reaches the weight value of materials which are conveyed by the material conveyor before the motor shifts gear and changes frequency, shifting gear and changing frequency of the motor by a control frequency changer according to the frequency change control policy. In addition, the invention further provides a controller and a control system for material metering, and a mixing station. According to the technical scheme disclosed by the invention, frequency of the motor of the material conveyor is changed among various frequencies according to the actual demand, so that metering precision and metering efficiency are improved, and loss is reduced.
Description
Technical field
The present invention relates to the measure control field, particularly a kind of material metering control method, controller, system and mixing plant.
Background technology
In various mixing plants, generally need earlier starting material such as sand, stone to be carried out accurately and metering fast, mix stirring again.Existing measurement technology is used two kinds of frequencies of height to control worm conveyor the scale hooper convey materials is measured, and by the weight sensor in the scale hooper weight signal of material is passed and to change electronic signal transmission to signal transmitting device into, is sent to PLC again.Worm conveyor inertia is big, power is high owing to have only two grades frequency measurement; After variable is near desired value, do not measure in a period of time, promptly get into the steady stage of scale; Utilize worm conveyor inertia to carry starting material, stop to measure actual weighing value until worm conveyor; If actual weighing value also has certain gap than desired value, then also need mend scale.Whole metering process possibly carry out the steady stage of scale repeatedly and mend the scale stage, until reaching desired value, so that consuming time longer.In the transfer process of low-and high-frequency, the span that frequency is bigger causes the loss of electric machine easily in addition, reduces the life-span of motor.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of raising measuring accuracy and efficient, and reduces material metering control method, controller, system and the mixing plant of the loss of electric machine.
In order to solve the problems of the technologies described above; The invention provides a kind of material metering control method; Said control method comprises; Calculate the gravimetric value of convey materials before the each gear shift frequency conversion of material conveyor motor according to VFC strategy and preset material metering target weight, said VFC strategy makes the frequency of operation of said material conveyor motor begin progressively to be increased to highest frequency from non-highest frequency, progressively is reduced to low-limit frequency then; The weight of the material conveyor convey materials that the reception Weight detecting device records; During weight of material value before weight that said Weight detecting device records the material conveyor convey materials reaches said material conveyor motor gear shift frequency conversion, the control of conversion device carries out the gear shift frequency conversion according to said VFC strategy.
The present invention also provides a kind of controller, is used for material metering, comprises input media, memory storage, control device and output unit, and said input media is used to receive the weight of the material conveyor convey materials that Weight detecting device records; Said memory storage is used to store the material metering target weight that presets; Said control device; Be used for calculating the gravimetric value of convey materials before the each gear shift frequency conversion of material conveyor motor according to VFC strategy and preset material metering target weight; Send the gear shift steering order during weight of material value before weight that said Weight detecting device records the material conveyor convey materials reaches said material conveyor motor gear shift frequency conversion; Said VFC strategy makes the frequency of operation of said material conveyor motor begin progressively to be increased to highest frequency from non-highest frequency, progressively is reduced to low-limit frequency then; Said output unit is used to receive the steering order that said control device sends, and exports steering order to Frequency Converter Control material conveyor motor gear shift frequency conversion.
The present invention also provides a kind of material metering control system, and said system comprises material conveyor, frequency converter, controller and Weight detecting device, and said material conveyor is used for the material conveyor electric machine frequency convey materials according to said frequency converter output; Said frequency converter, the steering order that is used for sending according to said controller changes the electric machine frequency of material conveyor; Said controller is used for according to the said frequency converter of Weight control of said material conveyor institute convey materials the material conveyor motor being carried out the gear shift frequency conversion; Said Weight detecting device is used to detect the weight of material conveyor institute convey materials, and weight signal is sent to controller, and said controller is above-mentioned controller.
The present invention also provides a kind of mixing plant, comprises stirring system, material feed system, metering system and control system, and said metering system comprises above-mentioned material metering control system.
Technique effect of the present invention is to be the multifrequency conversion through the material conveyor electric machine frequency; Make the frequency of operation of material conveyor motor begin progressively to be increased to highest frequency, progressively be reduced to low-limit frequency then from non-highest frequency, and gear shift frequency conversion during the weight of material value before the weight that Weight detecting device records the material conveyor convey materials reaches said material conveyor motor gear shift frequency conversion; Whole metering process is more flexible; And when measuring near desired value, the material conveyor electric machine frequency is more and more littler, and transmission speed is then more and more littler; Drop levels off to zero; Error in dipping is within the controlled range fully, and whole metering process free of discontinuities is accomplished, thereby improves measuring accuracy and efficient.The conversion of material conveyor electric machine frequency is more mild in addition, has also reduced the loss to the material conveyor motor, has prolonged its life-span.
Description of drawings
The material metering control method schematic flow sheet that Fig. 1 provides for the embodiment of the invention;
Fig. 2 is the sinusoidal curve figure of material metering under the ideal case;
The material metering control method process flow diagram that Fig. 3 provides for another embodiment of the present invention based on sinusoidal variation;
Fig. 4 is the particular flow sheet of step S303 among Fig. 3;
A kind of embodiment that Fig. 5 controls for the material metering that Fig. 3 provides;
The structural drawing of the controller that is used for material metering that Fig. 6 provides for the embodiment of the invention;
The structural drawing of the material metering control system that Fig. 7 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of material metering control method, adopts the multiple spot frequency-conversion processing, makes that material conveyor electric machine frequency conversion jump amplitude is little and efficient is high in the whole metering process.Generally speaking; The equipment of realizing this control method comprises material conveyor, frequency converter, controller and Weight detecting device; Through controller control of conversion device; The material conveyor electric machine frequency is changed with control mass transport speed, and combine the whole material metering process of FEEDBACK CONTROL of Weight detecting device.
The general precision prescribed of desirable measurement flow is accurate, and efficient is high, and little to the hardware device loss; So in theory, on the one hand, the size of electric machine frequency when the precision of metering is near desired value; Promptly the time more near desired value; The frequency of material conveyor motor is more little, just can guarantee that the blanking error is more little, thereby improve measuring accuracy; On the other hand, level and smooth change of frequency helps the operation of motor, can reduce the loss of electric machine, prolongs electrical machinery life.So desirable metering curve must have one to rise and fall and change milder, and peak value is arranged, and requires slope to level off to zero at last.
According to above-mentioned analysis, be illustrated in figure 1 as a kind of material metering control method schematic flow sheet that the embodiment of the invention provides, concrete steps comprise:
S101. calculate at every turn the shift gears gravimetric value of convey materials before the frequency conversion of material conveyor motor according to VFC strategy and preset material metering target weight; Said VFC strategy makes the frequency of operation of said material conveyor motor begin progressively to be increased to highest frequency from non-highest frequency, progressively is reduced to low-limit frequency then;
S103. receive the weight of the material conveyor convey materials that Weight detecting device records;
S105. during the weight of material value before weight that said Weight detecting device records the material conveyor convey materials reaches said material conveyor motor gear shift frequency conversion, the control of conversion device carries out the gear shift frequency conversion according to said VFC strategy.
Be the multifrequency conversion through above-mentioned control method material conveyor electric machine frequency; Make the frequency of operation of material conveyor motor begin progressively to be increased to highest frequency, progressively be reduced to low-limit frequency then from non-highest frequency, and gear shift frequency conversion during the weight of material value before the weight that Weight detecting device records the material conveyor convey materials reaches said material conveyor motor gear shift frequency conversion; Whole metering process is more flexible; And when measuring near desired value, the material conveyor electric machine frequency is more and more littler, and transmission speed is then more and more littler; Drop levels off to zero; Error in dipping is within the controlled range fully, and whole metering process free of discontinuities is accomplished, thereby improves measuring accuracy and efficient.The conversion of material conveyor electric machine frequency is more mild in addition, has also reduced the loss to the material conveyor motor, has prolonged its life-span.
Preferably; Said VFC strategy is specially: confirm that according to the material conveyor electric machine frequency gear of setting and from said material conveyor electric machine frequency gear the initial gear structure of non-highest frequency is the longitudinal axis with the frequency; With time is the sinusoidal curve of transverse axis; Make the sinusoidal curve of the said structure of material conveyor electric machine frequency transforming gear match begin progressively to be increased to highest frequency, progressively be reduced to low-limit frequency then from non-highest frequency.
Preferably, the electric machine frequency of said material conveyor has 3 gears that height is different at least.
Preferably, the said initial gear of confirming according to said material conveyor electric machine frequency gear is the frequency size gear placed in the middle in the said setting material conveyor motor gear.
Preferably, the working time before the each conversion of said material conveyor electric machine frequency gear equates.
Because according to analysis to desirable measurement flow; The material conveyor electric machine frequency satisfies condition and can reach technique effect; The embodiment of the invention has been chosen sinusoidal curve to satisfy the requirement of desirable measurement flow curve, so the embodiment of the invention also provides the control method of a kind of material conveyor electric machine frequency based on sinusoidal variation.Be appreciated that ground, the change curve that can realize technical purpose is not to be only limited to sinusoidal curve, and the embodiment of the invention only is example with the sinusoidal curve, below this embodiment is specified.
Fig. 2 is the sinusoidal curve figure of material metering under the ideal case, and wherein, T is the time shaft of metering; F is the frequency (relevant with the transmission speed of material conveyor motor) of material conveyor motor; Because electric machine frequency and the proportional relation of convey materials quality, thereby the area of the closed figure of curve and coordinate axis formation can be regarded the weighing value of material metering as.As shown in the figure, the A point is the sinusoidal curve peak, and promptly the highest frequency point is the rated power of motor under the perfect condition; The B point is the original frequency point; The C point is the sinusoidal curve minimum point, promptly measures end point, and electric machine frequency trends towards zero.
Under the situation of reality; The motor of multi-frequency control generally can't be accomplished and the on all four control that levels off to unlimited Frequency point of desirable measurement flow curve; But also can measure curve the operation of motor multi-frequency is set according to ideal; The metering curve is tried one's best and desirable measurement flow curve fitting, make it roughly be sinusoidal curve.
Based on above-mentioned analysis, this embodiment of the invention provide based on sinusoidal material metering control method, as shown in Figure 3, concrete steps are following:
S301. receive the weight of the material conveyor convey materials that Weight detecting device records;
S303. calculate the gravimetric value of convey materials before the each gear shift frequency conversion of material conveyor motor according to VFC strategy and preset material metering target weight; Said VFC strategy makes the frequency of operation of said material conveyor motor begin progressively to be increased to highest frequency from non-highest frequency, progressively is reduced to low-limit frequency then;
Particularly, the detailed step of above-mentioned steps S303, as follows as shown in Figure 5:
S3031. according to actual conditions controller is carried out parameter setting, to confirm the frequency gear of material conveyor motor, this frequency gear is generally more than 3.Particularly, the said curvilinear function that the frequency gear is set is:
Wherein, A is the rated frequency of material conveyor motor, 0 < x≤π.
Thereby can calculate material conveyor motor different frequency Y, thereby set out material conveyor electric machine frequency gear according to the different values of x.For match sinusoidal curve function also reduces error as far as possible; Need do some restrictions to the value of x here; Confirm the value of x according to the gear number of confirming setting, thereby confirm the gear frequency of material conveyor motor, n promptly ought be set, and (n is an integer; And in n >=3) when shelves, it is big or small directly equidistantly to divide n the interval frequency that just can obtain qualified concrete gear in the π interval 0.Example; As shown in Figure 5; When the material conveyor electric machine frequency is set to 7 grades; Then the value of x is
π, just can access the frequency size of seven gears in the substitution curve equation one by one.
S3033. confirm initial gear according to said material conveyor electric machine frequency gear.For fear of excessive loss's material conveyor motor, it is the most high-grade that initial gear is not preferably frequency, and promptly initial gear can make the material conveyor electric machine frequency have one from low to high for other gears beyond the high tap position of frequency elimination rate, more from high in the end change procedure.Because material conveyor electric machine frequency and mass transport speed are linear proportional relation; Thereby initial frequency is low more; The efficient of material metering must be low more; Thereby in order to take into account metering efficient and the material conveyor loss of electric machine, initial gear is preferably selected frequency size gear placed in the middle, and (when gear was counted n and is odd number, the big or small gear placed in the middle of frequency was the n/2 shelves; When gear was counted n and is even number, frequency size gear placed in the middle was n/2-1 shelves and n/2+1 shelves).Example, as shown in Figure 5, if the material conveyor electric machine frequency is set to 7 grades, initial gear can be selected 1 to 6 arbitrary gear, but preferably selects 4 grades.
S3035. be the longitudinal axis with frequency F, time T is a transverse axis, according to said initial gear frequency and said other gear frequency structure sinusoidal curves, makes the said sinusoidal curve of material conveyor electric machine frequency transformation curve match.Because the x value that the choosing of each gear frequency is based on equidistance is definite; So each gear frequency becomes the equidistance relation at the corresponding transverse axis time value T of the sinusoidal curve of said structure; Be to equate working time before the each conversion of said material conveyor electric machine frequency gear, then material conveyor electric machine frequency transformation curve with said initial gear frequency and said except that initial gear frequency other gear frequencies to be turning point be the stepped of horizontal equidistance along the sinusoidal curve of said structure.As shown in Figure 5; To set 7 grades of frequencies and the 4th grade is that initial frequency is an example, the structure sinusoidal curve, and then this sinusoidal curve of material conveyor electric machine frequency match is since the 4th grade of frequency; Every through one grade of frequency formation of unit interval rising curve break; Until highest frequency, every then through one grade of frequency formation of unit interval decline curve break, until low-limit frequency.
S3037. according to the material conveyor electric machine frequency transformation curve of said match, the proportionate relationship of curve and cumulative area that coordinate axis forms and the whole curves and the total area that coordinate axis forms when calculating the each gear shift frequency conversion of material conveyor motor.Because every grade of frequency of material conveyor motor is confirmed; And each gear shift institute elapsed time equates; And material conveyor electric machine frequency transformation curve with said initial gear frequency and said except that initial gear frequency other gear frequencies to be turning point be the stepped of horizontal equidistance along the sinusoidal curve of said structure; Thereby can calculate the rectangular area of each turning point frequency institute's duration in the material conveyor electric machine frequency transformation curve of said match respectively; Rectangular area sum; All curves are the rectangular area sum of whole turning point frequency institute's duration of material conveyor electric machine frequency transformation curve of said match with the total area that coordinate axis forms, thus the proportionate relationship of curve and cumulative area that coordinate axis forms and the whole curves and the total area that coordinate axis forms when drawing the each gear shift frequency conversion of material conveyor motor.As shown in Figure 5; Because the material conveyor electric machine frequency transformation curve of match is stepped; So with each gear shift frequency conversion is that boundary is divided into 10 rectangles with it; Calculate the area of each rectangle respectively, curve and cumulative area that coordinate axis forms and all curves and the total area that coordinate axis forms through the rectangular area addition can be calculated each gear shift frequency conversion time the then, thereby the proportionate relationship of drawing.
The gravimetric value of convey materials before the each gear shift frequency conversion of proportionate relationship calculating material conveyor motor of curve and cumulative area that coordinate axis forms and whole curves and the total area that coordinate axis forms during S3039. according to the each gear shift frequency conversion of material conveyor motor.Because electric machine frequency and the linear proportional relation of convey materials quality; Thereby the area of the closed figure that forms of curve and coordinate axis can regard the weighing value of material metering as, i.e. the proportionate relationship of convey materials accumulating weight and material metering target weight when curve and the proportionate relationship of cumulative area that coordinate axis forms and the whole curves and the total area that coordinate axis forms can be regarded the each gear shift frequency conversion of material conveyor motor as during the each gear shift frequency conversion of material conveyor motor.So can calculate the gravimetric value of convey materials before the each gear shift frequency conversion of material conveyor motor according to this proportionate relationship and the material metering target weight that presets.
S305. during the weight of material value before weight that Weight detecting device records the material conveyor convey materials reaches said material conveyor motor gear shift frequency conversion, the control of conversion device carries out the gear shift frequency conversion according to said VFC strategy.
Particularly, said Weight detecting device is used to detect the weight of material conveyor convey materials, and is connected with controller line.During weight of material value before the weight that records the material conveyor convey materials reaches said material conveyor motor gear shift frequency conversion, be about to signal and send to controller, make the material conveyor electric machine frequency carry out the gear shift frequency conversion by controller control of conversion device.
Above-mentioned material metering control method makes the material conveyor electric machine frequency be the multifrequency conversion; Make the frequency of operation of material conveyor motor begin progressively to be increased to highest frequency from non-highest frequency; Progressively be reduced to low-limit frequency then; And gear shift frequency conversion during the weight of material value before the weight that Weight detecting device records the material conveyor convey materials reaches said material conveyor motor gear shift frequency conversion, whole metering process is more flexible, and error in dipping more easy to control; Avoid scale surely to reach the flow process of mending scale, thereby improve measuring accuracy and efficient.The conversion of material conveyor electric machine frequency is more mild in addition, has also reduced the loss to the material conveyor motor, has prolonged its life-span.
The embodiment of the invention also provides a kind of controller, is used for material metering, and is as shown in Figure 6, comprises input media 601, memory storage 603, control device 605 and output unit 607.
Wherein, said input media 601 is used to receive the weight of the material conveyor convey materials that Weight detecting device records;
Said memory storage 603 is used to store the material metering target weight and the material conveyor electric machine frequency gear that preset, and said material conveyor electric machine frequency gear number is at least 3;
Said control device 605; Be used for calculating the frequency of each gear and the initial gear of confirming non-highest frequency according to the material conveyor electric machine frequency gear number of said memory storage 603 storages; Thereby formulate the VFC strategy; And according to the material metering target weight of said memory storage 603 storages and the accumulation weight of material before the each gear shift frequency conversion of said VFC policy calculation material conveyor motor, the weight sending controling instruction of the material conveyor convey materials that the reception Weight detecting device that receives according to said input media 601 then records.Said control device 605 specifically comprises control strategy formulation equipment 6051, gear shift weight computing equipment 6053, logic determines equipment 6055 and gear shift frequency conversion equipment 6057.Said control strategy is formulated equipment 6051, is used for calculating the frequency of each gear and the initial gear of confirming non-highest frequency according to the material conveyor electric machine frequency gear number of said memory storage 603 storages, thereby formulates the VFC strategy; Said gear shift weight computing equipment 6053, the accumulation weight of material before the each gear shift frequency conversion of VFC policy calculation material conveyor motor that is used for formulating equipment 6051 formulations according to the material metering target weight and the said control strategy of said memory storage 603 storages; Said logic determines equipment 6055, the weight of the material conveyor convey materials that the reception Weight detecting device that accumulation weight of material before the each gear shift frequency conversion of material conveyor motor that is used for calculating according to said gear shift weight computing equipment 6053 and input media 601 receive records judges whether the material conveyor motor is carried out the gear shift frequency conversion; Said gear shift frequency conversion equipment 6057, the control strategy that judgement that is used for making according to said logic determines equipment 6055 and said VFC policy development equipment 6051 are formulated sends the steering order of gear shift frequency conversion.
Said output unit 607 is used to receive the steering order that said control device 605 sends, and exports steering order to Frequency Converter Control material conveyor motor gear shift frequency conversion.
The said controller course of work is following: at first, in memory storage 603, preset the material metering target weight with experience as the case may be by operating personnel, confirm material conveyor electric machine frequency gear number, this frequency gear number is at least 3; Then; Control strategy in the control device 605 is formulated equipment 6051 according to the frequency of each gear of material conveyor electric machine frequency gear number calculating of said memory storage 603 storages and the initial gear of confirming non-highest frequency; Thereby confirm the VFC strategy; And calculate the accumulation weight of material before the each gear shift frequency conversion of material conveyor motor according to the material metering target weight of said memory storage 603 storages and said control strategy by gear shift weight computing equipment 6053 in the control device 605; And then the logic determines equipment 6055 in the control device 605 judges whether the material conveyor motor is carried out the gear shift frequency conversion; During accumulation weight of material before the weight of the material conveyor convey materials that reception Weight detecting device that input media 601 receives records reaches the each gear shift frequency conversion of material conveyor motor that said gear shift weight computing equipment 6053 calculates; Promptly make the judgement of gear shift frequency conversion, send the gear shift frequency conversion steering order of (comprise and be transformed to which shelves) thereby formulate the VFC strategy that equipment 6051 formulates according to this judgement and said control strategy by gear shift frequency conversion equipment 6057 in the control device 605; At last, output unit 607 is sent to frequency converter with the steering order that control device 605 sends, and realizes material conveyor motor gear shift frequency conversion by frequency converter.
Above-mentioned controller makes the material conveyor electric machine frequency be the multifrequency conversion; Make the frequency of operation of material conveyor motor begin progressively to be increased to highest frequency from non-highest frequency; Progressively be reduced to low-limit frequency then; And gear shift frequency conversion during the weight of material value before the weight that Weight detecting device records the material conveyor convey materials reaches said material conveyor motor gear shift frequency conversion, whole metering process is more flexible, and error in dipping more easy to control; Avoid scale surely to reach the flow process of mending scale, thereby improve measuring accuracy and efficient.The conversion of material conveyor electric machine frequency is more mild in addition, has also reduced the loss to the material conveyor motor, has prolonged its life-span.
The embodiment of the invention also provides a kind of material metering control system, and is as shown in Figure 7, comprises material conveyor 701, frequency converter 703, controller 705 and Weight detecting device 707.
Wherein, said material conveyor 701 is used for the material conveyor electric machine frequency convey materials according to said frequency converter 703 outputs;
Said frequency converter 703 is used for the electric machine frequency according to the steering order change material conveyor 701 of said controller 705 transmissions;
Said controller 705 is used for carrying out the gear shift frequency conversion according to 703 pairs of material conveyor motors of the said frequency converter of Weight control of said material conveyor institute convey materials;
Said Weight detecting device 707 is used to detect the weight of material conveyor institute convey materials, and weight signal is sent to controller 705.
Said controller 705 is above-mentioned controller, and its 26S Proteasome Structure and Function has been done comparatively detailed elaboration above-mentioned the explanation, repeats no more here.Under the control of said controller, each of said material metering control system formed respective outer side edges work, realizes the material metering control function.
Above-mentioned material metering control system makes the material conveyor electric machine frequency be the multifrequency conversion; Make the frequency of operation of material conveyor motor begin progressively to be increased to highest frequency from non-highest frequency; Progressively be reduced to low-limit frequency then; And gear shift frequency conversion during the weight of material value before the weight that Weight detecting device records the material conveyor convey materials reaches said material conveyor motor gear shift frequency conversion, whole metering process is more flexible, and error in dipping more easy to control; Avoid scale surely to reach the flow process of mending scale, thereby improve measuring accuracy and efficient.The conversion of material conveyor electric machine frequency is more mild in addition, has also reduced the loss to the material conveyor motor, has prolonged its life-span.
The embodiment of the invention also provides a kind of mixing plant, comprises stirring system, material feed system, metering system, control system and auxiliary equipment, and said metering system comprises above-mentioned material metering control system.Technical scheme of the present invention can apply to various building materials mixing plants such as concrete mixing plant, bituminous mixing plant, dry powder mortar mixing plant.
Above-mentioned mixing plant makes the material conveyor electric machine frequency be the multifrequency conversion through the material metering control system; Make the frequency of operation of material conveyor motor begin progressively to be increased to highest frequency from non-highest frequency; Progressively be reduced to low-limit frequency then; And gear shift frequency conversion during the weight of material value before the weight that Weight detecting device records the material conveyor convey materials reaches said material conveyor motor gear shift frequency conversion, whole metering process is more flexible, and error in dipping more easy to control; Avoid scale surely to reach the flow process of mending scale, thereby improve measuring accuracy and efficient.The conversion of material conveyor electric machine frequency is more mild in addition, has also reduced the loss to the material conveyor motor, has prolonged its life-span.
Combine accompanying drawing that embodiment of the present invention has been done detailed description above; But the present invention is not limited to above-mentioned embodiment; In the ken that one skilled in the relevant art possessed, can also make many variations, all belong to protection scope of the present invention it.
Claims (9)
1. a material metering control method is characterized in that, said control method comprises:
Calculate the gravimetric value of convey materials before the each gear shift frequency conversion of material conveyor motor according to VFC strategy and preset material metering target weight; Said VFC strategy makes the frequency of operation of said material conveyor motor begin progressively to be increased to highest frequency from non-highest frequency, progressively is reduced to low-limit frequency then;
The weight of the material conveyor convey materials that the reception Weight detecting device records;
During weight of material value before weight that said Weight detecting device records the material conveyor convey materials reaches said material conveyor motor gear shift frequency conversion, the control of conversion device carries out the gear shift frequency conversion according to said VFC strategy.
2. method according to claim 1 is characterized in that, said VFC strategy is specially:
Confirm that according to the material conveyor electric machine frequency gear of setting and from said material conveyor electric machine frequency gear the initial gear structure of non-highest frequency is the longitudinal axis with the frequency; With time is the sinusoidal curve of transverse axis; Make the sinusoidal curve of the said structure of material conveyor electric machine frequency transforming gear match begin progressively to be increased to highest frequency, progressively be reduced to low-limit frequency then from non-highest frequency.
3. method according to claim 1 and 2 is characterized in that, the electric machine frequency of said material conveyor has 3 gears that height is different at least.
4. method according to claim 2 is characterized in that, the said initial gear of confirming according to said material conveyor electric machine frequency gear is the frequency size gear placed in the middle in the said setting material conveyor motor gear.
5. method according to claim 2 is characterized in that, the working time before the each conversion of said material conveyor electric machine frequency gear equates.
6. a controller is used for material metering, comprises input media, memory storage, control device and output unit, it is characterized in that,
Said input media is used to receive the weight of the material conveyor convey materials that Weight detecting device records;
Said memory storage is used to store the material metering target weight that presets;
Said control device; Be used for calculating the gravimetric value of convey materials before the each gear shift frequency conversion of material conveyor motor according to VFC strategy and preset material metering target weight; Send the gear shift steering order during weight of material value before weight that said Weight detecting device records the material conveyor convey materials reaches said material conveyor motor gear shift frequency conversion; Said VFC strategy makes the frequency of operation of said material conveyor motor begin progressively to be increased to highest frequency from non-highest frequency, progressively is reduced to low-limit frequency then;
Said output unit is used to receive the steering order that said control device sends, and exports steering order to Frequency Converter Control material conveyor motor gear shift frequency conversion.
7. controller according to claim 6 is characterized in that, said memory device also is used to store preset material conveyor electric machine frequency gear number;
Said control device comprises control strategy formulation equipment, gear shift weight computing equipment, logic determines equipment and gear shift frequency conversion equipment,
Said control strategy is formulated equipment; Be used for calculating the frequency of each gear according to the material conveyor electric machine frequency gear number of said memory device stores; And confirm the initial gear of non-highest frequency, thereby formulate the VFC strategy from said material conveyor electric machine frequency gear;
Said gear shift weight computing equipment, the accumulation weight of material before the each gear shift frequency conversion of VFC policy calculation material conveyor motor that is used for formulating according to the material metering target weight and the said control strategy formulation equipment of said memory device stores;
Said logic determines equipment, the weight of the material conveyor convey materials that the reception Weight detecting device that accumulation weight of material before the each gear shift frequency conversion of material conveyor motor that is used for calculating according to said gear shift weight computing equipment and input media receive records judges whether the material conveyor motor is carried out the gear shift frequency conversion;
Said gear shift frequency conversion equipment, the control strategy that judgement that is used for making according to said logic determines equipment and said VFC policy development equipment are formulated sends the steering order of gear shift frequency conversion.
8. material metering control system, said system comprises material conveyor, frequency converter, controller and Weight detecting device,
Said material conveyor is used for the material conveyor electric machine frequency convey materials according to said frequency converter output;
Said frequency converter, the steering order that is used for sending according to said controller changes the electric machine frequency of material conveyor;
Said controller is used for according to the said frequency converter of Weight control of said material conveyor institute convey materials the material conveyor motor being carried out the gear shift frequency conversion;
Said Weight detecting device is used to detect the weight of material conveyor institute convey materials, and weight signal is sent to controller,
It is characterized in that said controller is claim 6 or 7 described controllers.
9. a mixing plant comprises stirring system, material feed system, metering system and control system, it is characterized in that, said metering system comprises the said material metering control system of claim 8.
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| CN102818615B (en) | 2015-01-07 |
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