CN103406193A - Method and device for controlling discharging of multiple ore grinding bins in ore grinding process - Google Patents
Method and device for controlling discharging of multiple ore grinding bins in ore grinding process Download PDFInfo
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- CN103406193A CN103406193A CN2013103822376A CN201310382237A CN103406193A CN 103406193 A CN103406193 A CN 103406193A CN 2013103822376 A CN2013103822376 A CN 2013103822376A CN 201310382237 A CN201310382237 A CN 201310382237A CN 103406193 A CN103406193 A CN 103406193A
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Abstract
The invention discloses a method and device for controlling discharging of multiple ore grinding bins in an ore grinding process. The method comprises the steps: determining a fundamental vibrating frequency of current controlled discharging according to the current actual discharging amount in the ore grinding process; detecting an actual material level of each ore grinding bin, and calculating a frequency regulating coefficient of each ore grinding bin according to the actual material level of each ore grinding bin, wherein the lower the actual material level of the ore grinding bin is, the smaller the frequency regulating coefficient is; determining a product of the frequency regulating coefficient of each ore grinding bin and the fundamental vibrating frequency as a target vibrating frequency of a vibrating ore feeder of each ore grinding bin. According to the technical scheme of the invention, the condition of emptying of the ore grinding bin in a discharging process can be effectively avoided, the probability of ore-free operation of the vibrating ore feeder is reduced, and thus the condition that the actual discharging amount greatly deviates from the controlled discharging amount instantly due to emptying of the ore grinding bin is reduced so that the discharging amount of the ore grinding is uniform and accurate, and the granularity of ore ground products is stable.
Description
Technical field
The application relates to the ore smelting field, particularly relates to the method and apparatus that in a kind of grinding process, the blanking of many ore grindings storehouse is controlled.
Background technology
In the production process of ore smelting, the raw ore ore obtained due to mining does not reach smelting requirements, needs first the raw ore ore to be carried out to ore dressing, thereby obtains meeting the concentrate of smelting requirements, is used further to smelting process.The links such as ore-dressing practice mainly comprises the crushing and screening of raw ore ore, grind grading, sorts, essence mine dehydration.Wherein, grinding process is that the ore grinding of fragmentation is arrived to suitable granularity, and the mineral that will pulverize offer the process of sorting.In grinding process, because ore is pulverized, effectively mineralogical composition can be from gangue, dissociating out, and different effective mineralogical compositions are dissociated mutually.
Grinding operation is to provide the critical process that sorts raw material, to the control situation of grinding process, will directly have influence on the granularity of ore milling product, and then impact sorts the quality of process and dressing product.Different optimum granularity is arranged under various mineral processing circuit due to various mineral aggregates, therefore, for given mineral aggregate and mineral processing circuit, need to guarantee that the particle size stable of ore milling product is on the optimum granularity of this given mineral aggregate and mineral processing circuit.
Under the grinding process controlled condition set, product granularity is whole can be changed along with the ore grinding storehouse discharge quantity of grinding process and change, therefore, for the granularity that makes ore milling product, can be stabilized on the optimum granularity of this grinding process controlled condition, just need the ore grinding storehouse discharge quantity of controlling grinding process to be stabilized on control discharge quantity corresponding to this optimum granularity.Referring to Fig. 1, the equipment that relates to the blanking of ore grinding storehouse that shows a kind of grinding process forms, the broken mineral aggregate of crossing is stored in each ore grinding storehouse, vibrofeeder by each ore grinding bin discharge port external (throw in to the conveyer belt of same conveyer by the control of M1～M6), so that this conveyer belt is delivered to mineral aggregate in ore mill and carries out grinding operation, wherein, vibrofeeder is controlled the actual discharge quantity in ore grinding storehouse according to vibration frequency.In order to keep the actual discharge quantity in ore grinding storehouse to be stabilized in, control on discharge quantity, in prior art, the vibration frequency of each vibrofeeder is to regulate according to the current actual discharge quantity (WI) in ore grinding storehouse, wherein, described actual discharge quantity is to obtain by the mineral aggregate weight detected on conveyer belt, is the summation of each actual cutting stock weight in ore grinding storehouse.
In a grinding process, usually adopt a plurality of ore grindings storehouse to be simultaneously this grinding attachment operation feed, wherein, the discharging opening in each ore grinding storehouse is controlled blanking by different separately vibrofeeders respectively.In the prior art, the vibration frequency of each vibrofeeder is all identical, particularly, and when vibration frequency is controlled, first according to current actual discharge quantity, calculate the benchmark vibration frequency, then the vibration frequency of each vibrofeeder all is set to this benchmark vibration frequency.But in actual grinding process, because ore passes through the broken mineral aggregate diameter formed afterwards between 0～300 millimeter, the granular size of mineral aggregate is also inhomogeneous, and bulk mineral aggregate input speed is slow, it is fast that the fritter mineral aggregate is thrown in speed, so, even the vibration frequency of each vibrofeeder immobilizes, also can there be fluctuation among a small circle in actual discharge quantity (WI), visible, and in fact the speed of the ore grinding storehouse blanking that each are different there are differences.Therefore, according to prior art, be arranged to identical vibration frequency for the vibrofeeder in each ore grinding storehouse, through the regular hour, difference on each ore grinding storehouse blanking velocity will cause part ore grinding storehouse the situation of hole capital after selling all securities when blanking, to occur, can lower time without material in the ore grinding storehouse of part hole capital after selling all securities, throw in to the actual discharge quantity (WI) on the conveyer belt of conveyer and will significantly reduce, thereby make actual discharge quantity (WI) moment significantly depart from the control discharge quantity, cause ore grinding storehouse discharge quantity inhomogeneous, inaccurate, finally cause the ore milling product granularity unstable.
Summary of the invention
The embodiment of the present application technical problem to be solved is, the method and apparatus that provides many ore grindings storehouse blanking in a kind of grinding process to control, take and solve according in prior art, causing inhomogeneous, the inaccurate and unsettled technical problem of ore milling product granularity of ore grinding storehouse blanking as the vibrofeeder in each ore grinding storehouse arranges identical vibration frequency.
First aspect, the embodiment of the present application provide a kind of method that in grinding process, the blanking of many ore grindings storehouse is controlled, and the method comprises:
According to the current actual discharge quantity of grinding process, determine the benchmark vibration frequency that current blanking is controlled;
Detect the actual material level in each ore grinding storehouse, and, according to the actual material level in each ore grinding storehouse, calculate the Frequency regulation factor in each ore grinding storehouse; Wherein, the ore grinding storehouse that actual material level is less, Frequency regulation factor is less;
By the product of the Frequency regulation factor in each ore grinding storehouse and described benchmark vibration frequency, be defined as the target vibration frequency of the vibrofeeder in each ore grinding storehouse.
Optionally, described actual material level according to each ore grinding storehouse, calculate the Frequency regulation factor in each ore grinding storehouse, is specially:
Calculate the actual material level in each ore grinding storehouse and the ratio between the benchmark material level, as the Frequency regulation factor in each ore grinding storehouse.
Optionally, described actual material level according to each ore grinding storehouse, calculate the Frequency regulation factor in each ore grinding storehouse, comprising:
Calculate the actual material level in each ore grinding storehouse and the ratio between the benchmark material level, as the adjustment factor to be revised in each ore grinding storehouse;
Judge in a nearest abnormality juding cycle whether grinding process meets the blanking condition of being obstructed; The described blanking condition of being obstructed means: the actual discharge quantity in the described abnormality detection cycle is in stable state, and the benchmark vibration frequency in the described abnormality detection cycle is in fluctuation status;
If so, according to default correction value, increase the adjustment factor to be revised in each ore grinding storehouse, obtain the Frequency regulation factor in each ore grinding storehouse;
If not, the adjustment factor to be revised in each ore grinding storehouse is defined as to the Frequency regulation factor in each ore grinding storehouse.
Optionally, whether the actual discharge quantity in the cycle and benchmark vibration frequency meet the blanking condition of being obstructed in a nearest abnormality detection in described judgement, comprising:
Calculate the first discharge quantity average, the second discharge quantity average, first frequency average and second frequency average; Wherein, described the first discharge quantity average is the mean value of all actual discharge quantities in the nearest abnormality juding cycle, described the second discharge quantity average is the mean value of all actual discharge quantities in nearest half abnormality juding cycle, described first frequency average is the mean value of all benchmark vibration frequencies in the nearest abnormality juding cycle, and described second frequency average is the mean value of all benchmark vibration frequencies in nearest half abnormality juding cycle;
Calculate the ratio of difference and described the first discharge quantity average between described the first discharge quantity average and the second discharge quantity average, as discharge quantity, change ratio, and the ratio that calculates difference and described first frequency average between described first frequency average and second frequency average determines, as the frequency change ratio;
Judge whether that described discharge quantity variation ratio is greater than the first proportion threshold value and described frequency change ratio is less than the second proportion threshold value;
If so, determine in the nearest abnormality juding cycle that grinding process meets the blanking condition of being obstructed;
If not, determine that in the nearest abnormality juding cycle, the discontented foot of grinding process is expected the condition of being obstructed.
Optionally, described correction value according to presetting increases the adjustment factor to be revised in each ore grinding storehouse, before obtaining the adjustment factor in each ore grinding storehouse, also comprises:
Whether the actual material level that judges all ore grindings storehouse all is less than the default control material level;
If so, carry out described correction value according to presetting and increase the adjustment factor to be revised in each ore grinding storehouse, obtain the Frequency regulation factor in each ore grinding storehouse;
If not, carry out the described Frequency regulation factor that the adjustment factor to be revised in each ore grinding storehouse is defined as to each ore grinding storehouse.
Optionally, described actual material level according to each ore grinding storehouse, after calculating the Frequency regulation factor in each ore grinding storehouse, also comprises:
Judge whether the moment that current time changes apart from last each current vibration frequency in ore grinding storehouse reaches the current adjusting constraint cycle, if, carry out describedly by the product of the Frequency regulation factor in each ore grinding storehouse and described benchmark vibration frequency, be defined as the target vibration frequency of the vibrofeeder in each ore grinding storehouse.
Optionally, described benchmark material level is 70% of the maximum material level in described ore grinding storehouse.
Second aspect, the embodiment of the present application provide the device that in a kind of grinding process, the blanking of many ore grindings storehouse is controlled, and comprising:
Reference frequency module, for the benchmark vibration frequency of determining that according to the current actual discharge quantity of grinding process current blanking is controlled;
Coefficients calculation block, for detection of the actual material level in each ore grinding storehouse, and, according to the actual material level in each ore grinding storehouse, calculate the Frequency regulation factor in each ore grinding storehouse; Wherein, the ore grinding storehouse that actual material level is less, Frequency regulation factor is less;
The target frequency module, for the product of the Frequency regulation factor by each ore grinding storehouse and described benchmark vibration frequency, be defined as the target vibration frequency of the vibrofeeder in each ore grinding storehouse.
Optionally, described coefficients calculation block, specifically be used to the actual material level that calculates each ore grinding storehouse and the ratio between the benchmark material level, as the Frequency regulation factor in each ore grinding storehouse.
Optionally, described coefficients calculation block specifically comprises:
Treat the correction factor submodule, be used to the actual material level that calculates each ore grinding storehouse and the ratio between the benchmark material level, as the adjustment factor to be revised in each ore grinding storehouse;
The judgement submodule that is obstructed, be used to judge a nearest abnormality juding in the cycle grinding process whether meet the blanking condition of being obstructed; The described blanking condition of being obstructed means: the actual discharge quantity in the described abnormality detection cycle is in stable state, and the benchmark vibration frequency in the described abnormality detection cycle is in fluctuation status;
The first adjustment factor submodule, in the situation that judgment result is that of the described judge module that is obstructed be, according to default correction value, increase the adjustment factor to be revised in each ore grinding storehouse, obtain the Frequency regulation factor in each ore grinding storehouse;
The second adjustment factor submodule, in the situation that the described judge module that is obstructed the determination result is NO, the adjustment factor to be revised in each ore grinding storehouse is defined as to the Frequency regulation factor in each ore grinding storehouse.
Optionally, the described judgement submodule that is obstructed specifically comprises:
The mean value computation submodule, be used to calculating the first discharge quantity average, the second discharge quantity average, first frequency average and second frequency average; Wherein, described the first discharge quantity average is the mean value of all actual discharge quantities in the nearest abnormality juding cycle, described the second discharge quantity average is the mean value of all actual discharge quantities in nearest half abnormality juding cycle, described first frequency average is the mean value of all benchmark vibration frequencies in the nearest abnormality juding cycle, and described second frequency average is the mean value of all benchmark vibration frequencies in nearest half abnormality juding cycle;
The ratio calculating sub module, for calculating the ratio of difference and described the first discharge quantity average between described the first discharge quantity average and the second discharge quantity average, as discharge quantity, change ratio, and the ratio that calculates difference and described first frequency average between described first frequency average and second frequency average determines, as the frequency change ratio;
Ratio judgement submodule, be used to judging whether that described discharge quantity variation ratio is greater than the first proportion threshold value and described frequency change ratio is less than the second proportion threshold value;
The first result of determination submodule, in the situation that judgment result is that of submodule of described ratio judgement is to determine in the nearest abnormality juding cycle that grinding process meets the blanking condition of being obstructed;
The second result of determination submodule, for the determination result is NO in the situation that described ratio judges submodule, determine that in the nearest abnormality juding cycle, the discontented foot of grinding process is expected the condition of being obstructed.
Optionally, described coefficients calculation block also comprises:
Material controlling judgement submodule, in the situation that described judgment result is that of submodule of judgement of being obstructed is to judge whether the actual material level in all ore grindings storehouse all is less than the default control material level;
First triggers submodule, in the situation that judgment result is that of submodule of described material controlling judgement is to trigger described the first adjustment factor submodule;
Second triggers submodule, for the determination result is NO in the situation that described material controlling judges submodule, triggers described the second adjustment factor submodule.
Optionally, also comprise:
The constraint judge module, for after described coefficients calculation block starts, judge whether current time reaches the adjusting constraint cycle apart from the moment that last each current vibration frequency in ore grinding storehouse changes;
The frequency trigger module, in the situation that judgment result is that of described constraint judge module is to trigger described target frequency module.
Optionally, described benchmark material level is 70% of the maximum material level in described ore grinding storehouse.
Compared with prior art, the application has the following advantages:
The technical scheme of the embodiment of the present application, what adopt is, the vibration frequency that to determine according to actual discharge quantity is as the benchmark vibration frequency, and calculate the Frequency regulation factor in each ore grinding storehouse according to each actual material level in ore grinding storehouse, using the product of the Frequency regulation factor in each ore grinding storehouse and benchmark vibration frequency more respectively as the target vibration frequency of the vibrofeeder in each ore grinding storehouse, wherein, the ore grinding storehouse that actual material level is less, Frequency regulation factor is less.Because the target vibration frequency of each ore grinding storehouse vibrofeeder is no longer all identical benchmark vibration frequency, but with the Frequency regulation factor of the actual material level calculating in each ore grinding storehouse gained, the benchmark vibration frequency is regulated, thereby make the ore grinding storehouse target vibration frequency that actual material level is lower less, blanking velocity is slower, hole capital after selling all securities appears in the ore grinding storehouse of reducing low actual material level when blanking the actual discharge quantity of situation just can not decrease in the blanking process, thereby reduce because of the instantaneous situation of controlling discharge quantity that significantly departs from of the actual discharge quantity in ore grinding storehouse, make ore grinding storehouse discharge quantity more even, more accurate, the ore milling product granularity is more stable.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, the accompanying drawing the following describes is only some embodiment that put down in writing in the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is that the equipment that relates to blanking in grinding process forms schematic diagram;
Fig. 2 is the flow chart of the embodiment of the method 1 that in the application, in grinding process, the blanking of many ore grindings storehouse is controlled;
Fig. 3 is the flow chart of the flow chart of Frequency regulation factor one embodiment in each ore grinding storehouse of calculating in the embodiment of the present application;
Fig. 4 judges the be obstructed flow chart of an embodiment of state of grinding process blanking in the embodiment of the present application;
Fig. 5 is the structure chart of the device embodiment 1 that in the application, in grinding process, the blanking of many ore grindings storehouse is controlled;
Fig. 6 is the structure chart of an embodiment of coefficients calculation block 502 in the embodiment of the present application;
Fig. 7 is the structure chart of an embodiment of judgement submodule 602 of being obstructed in the embodiment of the present application;
Fig. 8 is the structure chart of the another embodiment of coefficients calculation block 502 in the embodiment of the present application;
Fig. 9 is the structure chart of the device embodiment 2 that in the application, in grinding process, the blanking of many ore grindings storehouse is controlled.
The specific embodiment
In order to make those skilled in the art person understand better the application's scheme, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Based on the embodiment in the application, those of ordinary skills are not making under the creative work prerequisite the every other embodiment obtained, and all belong to the scope of the application's protection.
The inventor finds through research, and prior art is why can generating portion ore grinding storehouse empty and all the other ore grinding storehouses still have the situation of mineral aggregate, and reason is that prior art adopts is that vibration frequency for each ore grinding storehouse vibrofeeder setting is all identical.In fact, because the mineral aggregate size is inhomogeneous, and the distribution of each feed bin Mineral Material size is inconsistent, can cause each ore grinding storehouse under identical vibration frequency, to have slightly different blanking velocities, each ore grinding storehouse adopts identical vibration frequency will certain hour after, make the actual material level in each ore grinding storehouse produce very big difference, so also with regard to inevitably make the ore grinding storehouse of hanging down actual material level prior to the ore grinding storehouse hole capital after selling all securities of the actual material level of height and without expect can under.
Discovery based on above-mentioned research, the application's main thought is: the benchmark vibration frequency that no longer will determine according to current actual discharge quantity is directly as the vibration frequency in each ore grinding storehouse, but be each ore grinding storehouse calculated rate adjustment factor according to the actual material level in each ore grinding storehouse, with the Frequency regulation factor in each ore grinding storehouse, the benchmark vibration frequency is regulated again, target vibration frequency after regulating is as the current vibration frequency in each ore grinding storehouse, wherein, the ore grinding storehouse that actual material level is lower, its Frequency regulation factor is less.Because the vibration frequency in each ore grinding storehouse is that actual material level by the ore grinding storehouse decides, the higher vibration frequency of actual material level is larger, and blanking velocity is faster; The lower vibration frequency of actual material level is less, and blanking velocity is slower; The situation of hole capital after selling all securities appears in the low actual material level ore grinding storehouse that so just can reduce each ore grinding storehouse to adopt identical vibration frequency and cause when blanking prior to the ore grinding storehouse hole capital after selling all securities of the actual material level of height.
Below in conjunction with accompanying drawing, by embodiment, describe the specific implementation of the method and apparatus that in the application's grinding process, the blanking of many ore grindings storehouse is controlled in detail.
Referring to Fig. 2, show the flow chart of the embodiment of the method 1 that in the application, in grinding process, the blanking of many ore grindings storehouse is controlled.The present embodiment can comprise the following steps:
S201, determine according to the current actual discharge quantity of grinding process the benchmark vibration frequency that current blanking is controlled.
Due to the mineral aggregate in the ore grinding storehouse by vibrofeeder by blanking to the conveyer belt of conveyer, so the actual discharge quantity in ore grinding storehouse can obtain by the detection of the material flow detection device on conveyer to mass flow, wherein, material flow detection device can be for example belt conveyer scale, and each discharge quantity, mass flow can refer to the weight of mineral aggregate.Wherein, to the detection of mass flow, can be every a fixing sampling period, just detect once, for example, per second detects a mass flow and preserves.In addition, the mass flow detected can adopt the mode of database to preserve.
In the present embodiment, can be directly as current actual discharge quantity of this moment at each mass flow constantly detected, but because mineral aggregate meeting not of uniform size causes actual discharge quantity in the situation that the constant existence fluctuation of vibration frequency.In order to obtain, reduce the error that this fluctuation brings, current actual discharge quantity also can calculate by following formula:
WI=a
1×WI
end+a
2×WI
mid+a
3×WI
start；
Wherein, WI is current actual discharge quantity, WI
endFor the mass flow that current time detects, WI
StartFor the mean value of all mass flows of detecting in a nearest sense cycle, WI
midFor the mean value of all mass flows of detecting in nearest half sense cycle, a
1～a
3Be respectively the first to the 3rd weight coefficient and a
1A
2A
3.For example, get current time and be sense cycle, WI in first 60 seconds
StartFor the mean value of mass flow in nearest 60 seconds, WI
midMean value for mass flow in nearest 30 seconds; Wherein, a
1Can be preferably 0.2, a
2Can be preferably 0.3, a
3Can be preferably 0.5.
It should be noted that, the benchmark vibration frequency can adopt multiple different mode when definite.
The first determines that the mode of benchmark vibration frequency can be according to current actual discharge quantity, to determine current benchmark vibration frequency in real time, and wherein, as long as current actual discharge quantity changes, current benchmark vibration frequency also can be ensued variation.
But in practice, because mineral aggregate meeting not of uniform size causes actual discharge quantity in the situation that the constant existence fluctuation of vibration frequency, according to actual discharge quantity, determine the benchmark vibration frequency in real time, can cause current benchmark vibration frequency fluctuation on a large scale to occur, the actual discharge quantity of next being controlled by this benchmark vibration frequency will depart from the control discharge quantity.
The impact brought for fear of the fluctuation of actual discharge quantity, the second determines that the mode of benchmark vibration frequency can be first to calculate actual discharge quantity to depart from the deviation ratio of controlling discharge quantity, then according to number range under described deviation ratio, determine the current constraint cycle, if the time when current time changes apart from last benchmark vibration frequency surpasses the current constraint cycle, utilize the deviation ratio to redefine current benchmark vibration frequency, if the time when current time changes apart from last benchmark vibration frequency does not surpass the current constraint cycle, current benchmark vibration frequency remains unchanged.Wherein, the deviation ratio can adopt following formula to calculate:
In following formula, WI is current discharge quantity, WI
0For controlling discharge quantity, P is the deviation ratio.In addition, the deviation ratio also can mean with the percentage of P.
The deviation ratio larger to affiliated number range, adopt the longer current constraint cycle.For example, using P as the deviation ratio, the current constraint cycle can be 4T when P >=0.5, and the first current constraint cycle can be 3T when 0.2<P<0.5, and the current constraint cycle can be 2T when 0.1<P≤0.2, and the current constraint cycle can be T when P≤0.1.Wherein, T can be preferably 100 seconds.
In addition, utilizing the deviation ratio to redefine current benchmark vibration frequency, can be also for example to carry out according to the number range under the deviation ratio:
(1) if the absolute value of described deviation ratio belongs to the first proportion, current benchmark vibration frequency for example can be calculated by following formula:
Wherein, SI is current benchmark vibration frequency, b
1Be the first default coefficient, P is the deviation ratio, and WI is current actual discharge quantity, WI
0For controlling discharge quantity; For example, b
1Can be preferably 1/3;
(2) if the absolute value of described deviation ratio belongs to the second proportion, current benchmark vibration frequency for example can be calculated by following formula:
Wherein, SI is current benchmark vibration frequency, b
2Be the second default coefficient, P is the deviation ratio, and WI is current actual discharge quantity, WI
0For controlling discharge quantity; For example, b
2Can be preferably 1/2;
(3) if the absolute value of described deviation ratio belongs to the 3rd proportion, current benchmark vibration frequency for example can be calculated by following formula:
Wherein, SI is current benchmark vibration frequency, b
3Be the 3rd default coefficient, P is the deviation ratio, and WI is current actual discharge quantity, WI
0For controlling discharge quantity; For example, b
3Can be preferably 1;
(4) if the absolute value of described deviation ratio belongs to the 4th proportion, current benchmark vibration frequency for example can be calculated by following formula:
Wherein, SI is current benchmark vibration frequency, and P is the deviation ratio, and WI is current actual discharge quantity, WI
0For controlling discharge quantity; For example, b
4Can be preferably 1;
(5) if the absolute value of described deviation ratio belongs to the 5th proportion, current benchmark vibration frequency is constant.
In these five kinds of modes of above-mentioned (1)～(5), described the first proportion to described the 5th proportion reduces successively, and the default coefficient of the described first default coefficient to the four can increase successively and all be not more than 1.For example, the first proportion can be that P >=0.5, the second proportion can be that 0.2<P<0.5, the three proportion can be that 0.1<P≤0.2, the four proportion can be that 0.02<P≤0.1, the five proportion can be P≤0.02.
S202, detect the actual material level in each ore grinding storehouse, and, according to the actual material level in each ore grinding storehouse, calculate the Frequency regulation factor in each ore grinding storehouse; Wherein, the ore grinding storehouse that actual material level is less, Frequency regulation factor is less.
The material level in ore grinding storehouse, generally refer to the height of ore grinding storehouse Mineral Material, can detect by level-sensing device.In the present embodiment, a benchmark material level can be set and with actual material level, compare the calculated rate adjustment factor, this benchmark material level can pre-set.For example, the benchmark material level in each ore grinding storehouse can be 70% of the maximum material level in this ore grinding storehouse.
When the calculated rate adjustment factor, a kind of possible account form is: calculate the actual material level in each ore grinding storehouse and the ratio between the benchmark material level, as the Frequency regulation factor in each ore grinding storehouse.For example, the Frequency regulation factor in each ore grinding storehouse can calculate by following formula:
Wherein, a
iBe the Frequency regulation factor in i ore grinding storehouse, L
iBe the actual material level in i ore grinding storehouse, L
I-setIt is the benchmark material level in i ore grinding storehouse.Wherein, each ore grinding storehouse is if identical, the L in each ore grinding storehouse
I-setCan equate.
It should be noted that, in the blanking process in ore grinding storehouse, excessive mineral aggregate ore can make the blanking in ore grinding storehouse be obstructed sometimes.For these excessive ores can, successfully from the discharging opening blanking, can suitably be increased the vibration frequency of ore grinding storehouse rock feeder on original basis.In conjunction with this consideration, when the calculated rate adjustment factor, another kind of possible account form can be using the ratio of actual material level and benchmark material level as adjustment factor to be revised, grinding process is in the blanking state that is obstructed if judge, increase adjustment factor to be revised and obtain Frequency regulation factor, so that the target vibration frequency in each ore grinding storehouse of final gained increases.Particularly, in the present embodiment, calculate as shown in Figure 3 the flow chart of Frequency regulation factor one embodiment in each ore grinding storehouse, present embodiment can comprise:
S301, the actual material level that calculates each ore grinding storehouse and the ratio between the benchmark material level, as the adjustment factor to be revised in each ore grinding storehouse.
S302, judge in a nearest abnormality juding cycle that whether grinding process meets the blanking condition of being obstructed, if enter S303, enters S304 if not; The described blanking condition of being obstructed means: the actual discharge quantity in the described abnormality detection cycle is in stable state, and the benchmark vibration frequency in the described abnormality detection cycle is in fluctuation status.
Wherein, the be obstructed state of condition of blanking can be that the situation of change of the actual discharge quantity in the cycle and benchmark vibration frequency by abnormality juding is judged for grinding process.Wherein, the abnormality juding cycle can be a Preset Time length, a nearest abnormality juding cycle is to be no more than the time period of Preset Time length apart from current time, for example, a nearest abnormality juding cycle can be first 1 minute, first 5 minutes, first 10 minutes, first 30 minutes of current time etc.
In the present embodiment, a kind of possible decision procedure of being obstructed, can utilize the variance of interior actual discharge quantity of abnormality juding cycle and benchmark vibration frequency to mean that variation place situation belongs to stable state or fluctuation status, if the variance of actual discharge quantity is less than the first variance threshold value and illustrates and be in stable state, the variance of benchmark vibration frequency is greater than again the second variance threshold value and illustrates and be in fluctuation status.The another kind of possible decision procedure of being obstructed, can be by two, to mean to change apart from the mean bias ratio in the current time different time sections to be in stable state or fluctuation status, particularly, shown in Figure 4, can complete S302 by following steps:
S401, calculating the first discharge quantity average, the second discharge quantity average, first frequency average and second frequency average.
Wherein, described the first discharge quantity average is the mean value of all actual discharge quantities in the nearest abnormality juding cycle, described the second discharge quantity average is the mean value of all actual discharge quantities in nearest half abnormality juding cycle, described first frequency average is the mean value of all benchmark vibration frequencies in the nearest abnormality juding cycle, and described second frequency average is the mean value of all benchmark vibration frequencies in nearest half abnormality juding cycle.
Wherein, a nearest abnormality juding cycle can be preferably first 20 minutes of current time, and corresponding nearest half abnormality juding cycle can be preferably first 10 minutes of current time.
The ratio of difference and described the first discharge quantity average between S402, described the first discharge quantity average of calculating and the second discharge quantity average, as discharge quantity, change ratio, and the ratio that calculates difference and described first frequency average between described first frequency average and second frequency average determines, as the frequency change ratio.
Wherein, discharge quantity variation ratio and frequency change ratio can be calculated by following two formulas respectively:
Wherein, P
wFor discharge quantity changes ratio, WI
WholeBe the first discharge quantity average, WI
HaBe the second discharge quantity average, P
sFor frequency change ratio, SI
WholeFor first frequency average, SI
HaFor the second frequency average.
S403, judge whether that described discharge quantity variation ratio is greater than the first proportion threshold value and described frequency change ratio is less than the second proportion threshold value, if enter S404, if otherwise enter S405.
Wherein, the first proportion threshold value can be preferably 0.05, the second proportion threshold value and can be preferably 0.02.
Be understandable that, when judgement, can judge first that discharge quantity changes ratio and whether is greater than the first proportion threshold value, if follow again determination frequency variation ratio, whether be less than the second proportion threshold value, perhaps, also can first determination frequency variation ratio whether be less than the second proportion threshold value, discharge quantity changes ratio and whether is greater than the first proportion threshold value if then judge again.In the present embodiment, the order circumscribed not of both judgements.
S404, determine in a nearest abnormality juding cycle that grinding process meets the blanking condition of being obstructed.
S405, determine in a nearest abnormality juding cycle the discontented foot material of the grinding process condition of being obstructed.
Then return to Fig. 3, be understandable that, after S404 is complete, can enters S303 and carry out, after S405 is complete, can enters S304 and carry out.
S303, increase the adjustment factor to be revised in each ore grinding storehouse according to default correction value, obtain the Frequency regulation factor in each ore grinding storehouse.
Wherein, default correction value can be one and be greater than zero constant, and the correction factor for the treatment of in each ore grinding storehouse all obtains the adjustment factor in each ore grinding storehouse with this correction value addition, and for example this correction value can be 0.1, specifically can be expressed as a
i=a
i'+b, wherein, a
iThe adjustment factor that means i ore grinding storehouse, a
i' meaning the correction factor for the treatment of in i ore grinding storehouse, b means the correction value of presetting; Perhaps, default correction value can be also one and be greater than 1 proportionality constant, and the adjustment factor to be revised in each ore grinding storehouse all multiplies each other and obtains the Frequency regulation factor in each ore grinding storehouse with this correction value.
S304, the adjustment factor to be revised in each ore grinding storehouse is defined as to the Frequency regulation factor in each ore grinding storehouse.
It should be noted that, in present embodiment, judgment result is that of S302, be in situation, can also be before carrying out S303, whether the actual material level that further judges again all ore grindings storehouse all is less than the default control material level, if can enter again execution S303, if otherwise can enter execution S304.Through further judgement, can judge the situation that all ore grindings storehouse whether all exists blanking to be obstructed, and increase adjustment factor to be revised while only in all ore grindings storehouse, all existing blanking to be obstructed, can avoid excessively regulating vibration frequency and the error brought.Wherein, default control material level can be preferably 50% of maximum material level.
Then return to Fig. 2.
After S202 is complete, can directly enter S203, perhaps, also can judge further first whether current time reaches the current adjusting constraint cycle apart from last each current vibration frequency in ore grinding storehouse institute's elapsed time that changes, if so, can carry out S203, if not, the current vibration frequency that can maintain each ore grinding storehouse is constant, and the vibration frequency that refusal utilizes current benchmark vibration frequency that abovementioned steps obtains and adjustment factor to recalculate each ore grinding storehouse at current time.Wherein, the current adjusting constraint cycle can be adopted changeless time span, for example, the current adjusting constraint cycle by the actual material level in all ore grindings storehouse during all lower than the default control material level can be set to 2T, the current adjusting constraint cycle of all the other situations can be set to T, wherein, T can be preferably 100 seconds.
S203, by the product of the Frequency regulation factor in each ore grinding storehouse and described benchmark vibration frequency, be defined as the target vibration frequency of the vibrofeeder in each ore grinding storehouse.
Wherein, the target vibration frequency of each ore grinding storehouse vibrofeeder can adopt following formula to calculate:
SI
i=a
i×SI
set；
Wherein, SI
iBe the target vibration frequency of i ore grinding storehouse vibrofeeder, a
iBe the Frequency regulation factor in i ore grinding storehouse, SI
setFor current benchmark vibration frequency.
It should be noted that, the vibration frequency of vibrofeeder is actually to be controlled by the motor of vibrofeeder, after S203 has determined the target vibration frequency in each ore grinding storehouse, can regulate running current that should ore grinding storehouse vibrofeeder motor according to each target vibration frequency, adjusting by running current changes the output torque of motor, thereby realizes the adjusting to vibration frequency.
Technical scheme by the present embodiment, because the target vibration frequency of each ore grinding storehouse vibrofeeder is no longer all identical benchmark vibration frequency, but with the Frequency regulation factor of the actual material level calculating in each ore grinding storehouse gained, the benchmark vibration frequency is regulated, thereby make the ore grinding storehouse target vibration frequency that actual material level is lower less, blanking velocity is slower, can effectively avoid just in the ore grinding storehouse of blanking, occurring the situation of hole capital after selling all securities, reduce the probability of vibrofeeder without the ore deposit running, thereby reduce because ore grinding storehouse hole capital after selling all securities causes actual discharge quantity moment and significantly depart from the situation of controlling discharge quantity, make ore grinding storehouse discharge quantity more even, more accurate, the ore milling product granularity is more stable.
Corresponding to embodiment of the method, the embodiment of the present application also provides the device that in a kind of grinding process, the blanking of many ore grindings storehouse is controlled.
Referring to Fig. 5, show the structure chart of the device embodiment 1 that in the application, in grinding process, the blanking of many ore grindings storehouse is controlled.In the present embodiment, described device can comprise:
In the possible embodiment of the first of the present embodiment, described coefficients calculation block 502, specifically be used to the actual material level that calculates each ore grinding storehouse and the ratio between the benchmark material level, as the Frequency regulation factor in each ore grinding storehouse.
In the possible embodiment of the second of the present embodiment, referring to Fig. 6, described coefficients calculation block 502 specifically can comprise:
Treat correction factor submodule 601, be used to the actual material level that calculates each ore grinding storehouse and the ratio between the benchmark material level, as the adjustment factor to be revised in each ore grinding storehouse;
The judgement submodule 602 that is obstructed, be used to judge a nearest abnormality juding in the cycle grinding process whether meet the blanking condition of being obstructed; The described blanking condition of being obstructed means: the actual discharge quantity in the described abnormality detection cycle is in stable state, and the benchmark vibration frequency in the described abnormality detection cycle is in fluctuation status;
The first adjustment factor submodule 603, in the situation that described judgment result is that of judge module 602 of being obstructed be, according to default correction value, increase the adjustment factor to be revised in each ore grinding storehouse, obtain the Frequency regulation factor in each ore grinding storehouse;
The second adjustment factor submodule 604, in the situation that describedly be obstructed that the determination result is NO for judge module 602, be defined as the adjustment factor to be revised in each ore grinding storehouse the Frequency regulation factor in each ore grinding storehouse.
In the third possible embodiment of the present embodiment, in conjunction with the possible embodiment of the second, referring to Fig. 7, the described judgement submodule 602 that is obstructed specifically can comprise:
Mean value computation submodule 701, be used to calculating the first discharge quantity average, the second discharge quantity average, first frequency average and second frequency average; Wherein, described the first discharge quantity average is the mean value of all actual discharge quantities in the nearest abnormality juding cycle, described the second discharge quantity average is the mean value of all actual discharge quantities in nearest half abnormality juding cycle, described first frequency average is the mean value of all benchmark vibration frequencies in the nearest abnormality juding cycle, and described second frequency average is the mean value of all benchmark vibration frequencies in nearest half abnormality juding cycle;
Ratio calculating sub module 702, for calculating the ratio of difference and described the first discharge quantity average between described the first discharge quantity average and the second discharge quantity average, as discharge quantity, change ratio, and the ratio that calculates difference and described first frequency average between described first frequency average and second frequency average determines, as the frequency change ratio;
The first result of determination submodule 704, in the situation that judgment result is that of submodule 703 of described ratio judgement is to determine in the nearest abnormality juding cycle that grinding process meets the blanking condition of being obstructed;
The second result of determination submodule 705, for the determination result is NO in the situation that described ratio judges submodule 703, determine that in the nearest abnormality juding cycle, the discontented foot of grinding process is expected the condition of being obstructed.
In the 4th kind of possible embodiment of the present embodiment, in conjunction with the possible embodiment of the second, described coefficients calculation block 502 can also comprise:
Material controlling judgement submodule 801, in the situation that described judgment result is that of submodule 602 of judgement of being obstructed is to judge whether the actual material level in all ore grindings storehouse all is less than the default control material level;
First triggers submodule 802, in the situation that judgment result is that of submodule 801 of described material controlling judgement is to trigger described the first adjustment factor submodule 603;
Second triggers submodule 803, for the determination result is NO in the situation that described material controlling judges submodule 801, triggers described the second adjustment factor submodule 604.
Referring to Fig. 9, show the structure chart of the device embodiment 2 that in the application, in grinding process, the blanking of many ore grindings storehouse is controlled.In the present embodiment, except all structures shown in Figure 5, described device can also comprise:
In the 6th kind of possible embodiment of the present embodiment, described benchmark material level is 70% of the maximum material level in described ore grinding storehouse.
Technical scheme by the present embodiment, because the target vibration frequency of each ore grinding storehouse vibrofeeder is no longer all identical benchmark vibration frequency, but with the Frequency regulation factor of the actual material level calculating in each ore grinding storehouse gained, the benchmark vibration frequency is regulated, thereby make the ore grinding storehouse target vibration frequency that actual material level is lower less, blanking velocity is slower, can effectively avoid just in the ore grinding storehouse of blanking, occurring the situation of hole capital after selling all securities, reduce the probability of vibrofeeder without the ore deposit running, thereby reduce because ore grinding storehouse hole capital after selling all securities causes actual discharge quantity moment and significantly depart from the situation of controlling discharge quantity, make ore grinding storehouse discharge quantity more even, more accurate, the ore milling product granularity is more stable.
It should be noted that, in this article, relational terms such as the first and second grades only is used for an entity or operation are separated with another entity or operating space, and not necessarily requires or imply between these entities or operation the relation of any this reality or sequentially of existing.Term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make the process, method, article or the equipment that comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.In the situation that not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
For device embodiment, because it corresponds essentially to embodiment of the method, so relevant part gets final product referring to the part explanation of embodiment of the method.Device embodiment described above is only schematic, wherein said module as the separating component explanation can or can not be also physically to separate, the parts that show as module can be or can not be also physical modules, namely can be positioned at a place, or also can be distributed on a plurality of NEs.Can select according to the actual needs wherein some or all of module to realize the purpose of the present embodiment scheme.Those of ordinary skills in the situation that do not pay creative work, namely can understand and implement.
The above is only the application's the specific embodiment; it should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the application's protection domain.
Claims (14)
1. the method that in a grinding process, the blanking of many ore grindings storehouse is controlled, is characterized in that, comprising:
According to the current actual discharge quantity of grinding process, determine the benchmark vibration frequency that current blanking is controlled;
Detect the actual material level in each ore grinding storehouse, and, according to the actual material level in each ore grinding storehouse, calculate the Frequency regulation factor in each ore grinding storehouse; Wherein, the ore grinding storehouse that actual material level is less, Frequency regulation factor is less;
By the product of the Frequency regulation factor in each ore grinding storehouse and described benchmark vibration frequency, be defined as the target vibration frequency of the vibrofeeder in each ore grinding storehouse.
2. method according to claim 1, is characterized in that, described actual material level according to each ore grinding storehouse, calculate the Frequency regulation factor in each ore grinding storehouse, is specially:
Calculate the actual material level in each ore grinding storehouse and the ratio between the benchmark material level, as the Frequency regulation factor in each ore grinding storehouse.
3. method according to claim 1, is characterized in that, described actual material level according to each ore grinding storehouse, calculate the Frequency regulation factor in each ore grinding storehouse, comprising:
Calculate the actual material level in each ore grinding storehouse and the ratio between the benchmark material level, as the adjustment factor to be revised in each ore grinding storehouse;
Judge in a nearest abnormality juding cycle whether grinding process meets the blanking condition of being obstructed; The described blanking condition of being obstructed means: the actual discharge quantity in the described abnormality detection cycle is in stable state, and the benchmark vibration frequency in the described abnormality detection cycle is in fluctuation status;
If so, according to default correction value, increase the adjustment factor to be revised in each ore grinding storehouse, obtain the Frequency regulation factor in each ore grinding storehouse;
If not, the adjustment factor to be revised in each ore grinding storehouse is defined as to the Frequency regulation factor in each ore grinding storehouse.
4. method according to claim 3, is characterized in that, whether the actual discharge quantity in the cycle and benchmark vibration frequency meet the blanking condition of being obstructed in a nearest abnormality detection in described judgement, comprising:
Calculate the first discharge quantity average, the second discharge quantity average, first frequency average and second frequency average; Wherein, described the first discharge quantity average is the mean value of all actual discharge quantities in the nearest abnormality juding cycle, described the second discharge quantity average is the mean value of all actual discharge quantities in nearest half abnormality juding cycle, described first frequency average is the mean value of all benchmark vibration frequencies in the nearest abnormality juding cycle, and described second frequency average is the mean value of all benchmark vibration frequencies in nearest half abnormality juding cycle;
Calculate the ratio of difference and described the first discharge quantity average between described the first discharge quantity average and the second discharge quantity average, as discharge quantity, change ratio, and the ratio that calculates difference and described first frequency average between described first frequency average and second frequency average determines, as the frequency change ratio;
Judge whether that described discharge quantity variation ratio is greater than the first proportion threshold value and described frequency change ratio is less than the second proportion threshold value;
If so, determine in the nearest abnormality juding cycle that grinding process meets the blanking condition of being obstructed;
If not, determine that in the nearest abnormality juding cycle, the discontented foot of grinding process is expected the condition of being obstructed.
5. method according to claim 3, is characterized in that, described correction value according to presetting increases the adjustment factor to be revised in each ore grinding storehouse, before obtaining the adjustment factor in each ore grinding storehouse, also comprises:
Whether the actual material level that judges all ore grindings storehouse all is less than the default control material level;
If so, carry out described correction value according to presetting and increase the adjustment factor to be revised in each ore grinding storehouse, obtain the Frequency regulation factor in each ore grinding storehouse;
If not, carry out the described Frequency regulation factor that the adjustment factor to be revised in each ore grinding storehouse is defined as to each ore grinding storehouse.
6. method according to claim 1, is characterized in that, described actual material level according to each ore grinding storehouse, after calculating the Frequency regulation factor in each ore grinding storehouse, also comprises:
Judge whether the moment that current time changes apart from last each current vibration frequency in ore grinding storehouse reaches the current adjusting constraint cycle, if, carry out describedly by the product of the Frequency regulation factor in each ore grinding storehouse and described benchmark vibration frequency, be defined as the target vibration frequency of the vibrofeeder in each ore grinding storehouse.
7. according to the described method of claim 1～6, it is characterized in that, described benchmark material level is 70% of the maximum material level in described ore grinding storehouse.
8. the device that in a grinding process, the blanking of many ore grindings storehouse is controlled, is characterized in that, comprising:
Reference frequency module, for the benchmark vibration frequency of determining that according to the current actual discharge quantity of grinding process current blanking is controlled;
Coefficients calculation block, for detection of the actual material level in each ore grinding storehouse, and, according to the actual material level in each ore grinding storehouse, calculate the Frequency regulation factor in each ore grinding storehouse; Wherein, the ore grinding storehouse that actual material level is less, Frequency regulation factor is less;
The target frequency module, for the product of the Frequency regulation factor by each ore grinding storehouse and described benchmark vibration frequency, be defined as the target vibration frequency of the vibrofeeder in each ore grinding storehouse.
9. device according to claim 8, is characterized in that, described coefficients calculation block, specifically be used to the actual material level that calculates each ore grinding storehouse and the ratio between the benchmark material level, as the Frequency regulation factor in each ore grinding storehouse.
10. device according to claim 8, is characterized in that, described coefficients calculation block specifically comprises:
Treat the correction factor submodule, be used to the actual material level that calculates each ore grinding storehouse and the ratio between the benchmark material level, as the adjustment factor to be revised in each ore grinding storehouse;
The judgement submodule that is obstructed, be used to judge a nearest abnormality juding in the cycle grinding process whether meet the blanking condition of being obstructed; The described blanking condition of being obstructed means: the actual discharge quantity in the described abnormality detection cycle is in stable state, and the benchmark vibration frequency in the described abnormality detection cycle is in fluctuation status;
The first adjustment factor submodule, in the situation that judgment result is that of the described judge module that is obstructed be, according to default correction value, increase the adjustment factor to be revised in each ore grinding storehouse, obtain the Frequency regulation factor in each ore grinding storehouse;
The second adjustment factor submodule, in the situation that the described judge module that is obstructed the determination result is NO, the adjustment factor to be revised in each ore grinding storehouse is defined as to the Frequency regulation factor in each ore grinding storehouse.
11. device according to claim 10, is characterized in that, the described judgement submodule that is obstructed specifically comprises:
The mean value computation submodule, be used to calculating the first discharge quantity average, the second discharge quantity average, first frequency average and second frequency average; Wherein, described the first discharge quantity average is the mean value of all actual discharge quantities in the nearest abnormality juding cycle, described the second discharge quantity average is the mean value of all actual discharge quantities in nearest half abnormality juding cycle, described first frequency average is the mean value of all benchmark vibration frequencies in the nearest abnormality juding cycle, and described second frequency average is the mean value of all benchmark vibration frequencies in nearest half abnormality juding cycle;
The ratio calculating sub module, for calculating the ratio of difference and described the first discharge quantity average between described the first discharge quantity average and the second discharge quantity average, as discharge quantity, change ratio, and the ratio that calculates difference and described first frequency average between described first frequency average and second frequency average determines, as the frequency change ratio;
Ratio judgement submodule, be used to judging whether that described discharge quantity variation ratio is greater than the first proportion threshold value and described frequency change ratio is less than the second proportion threshold value;
The first result of determination submodule, in the situation that judgment result is that of submodule of described ratio judgement is to determine in the nearest abnormality juding cycle that grinding process meets the blanking condition of being obstructed;
The second result of determination submodule, for the determination result is NO in the situation that described ratio judges submodule, determine that in the nearest abnormality juding cycle, the discontented foot of grinding process is expected the condition of being obstructed.
12. device according to claim 10, is characterized in that, described coefficients calculation block also comprises:
Material controlling judgement submodule, in the situation that described judgment result is that of submodule of judgement of being obstructed is to judge whether the actual material level in all ore grindings storehouse all is less than the default control material level;
First triggers submodule, in the situation that judgment result is that of submodule of described material controlling judgement is to trigger described the first adjustment factor submodule;
Second triggers submodule, for the determination result is NO in the situation that described material controlling judges submodule, triggers described the second adjustment factor submodule.
13. device according to claim 8, is characterized in that, also comprises:
The constraint judge module, for after described coefficients calculation block starts, judge whether current time reaches the adjusting constraint cycle apart from the moment that last each current vibration frequency in ore grinding storehouse changes;
The frequency trigger module, in the situation that judgment result is that of described constraint judge module is to trigger described target frequency module.
14. according to Claim 8～13 described devices, is characterized in that, described benchmark material level is 70% of the maximum material level in described ore grinding storehouse.
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| CN103984314A (en) * | 2014-05-14 | 2014-08-13 | 北京矿冶研究总院 | Intelligent ore feeding control method and device for multiple material machines |
| CN104624355A (en) * | 2015-01-09 | 2015-05-20 | 山西太钢不锈钢股份有限公司 | Raw ore storage yard blanking control method |
| CN106890722A (en) * | 2017-03-09 | 2017-06-27 | 广西冶金研究院有限公司 | A kind of intelligent grinding machine is to ore deposit system and its control method |
| CN109827685A (en) * | 2017-11-23 | 2019-05-31 | 中冶长天国际工程有限责任公司 | Active carbon flue gas purification system, roll feeder discharge efficiency measurement method |
| CN109827787A (en) * | 2017-11-23 | 2019-05-31 | 中冶长天国际工程有限责任公司 | Active carbon flue gas purification system and its roll feeder discharge efficiency measurement method |
| CN111515010A (en) * | 2020-05-29 | 2020-08-11 | 栾川县金鼎矿业有限公司 | Ball mill control method using electric lugs |
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| CN109827787A (en) * | 2017-11-23 | 2019-05-31 | 中冶长天国际工程有限责任公司 | Active carbon flue gas purification system and its roll feeder discharge efficiency measurement method |
| CN111515010A (en) * | 2020-05-29 | 2020-08-11 | 栾川县金鼎矿业有限公司 | Ball mill control method using electric lugs |
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