CN103691544A - Method and device for controlling liquid level in ore pulp pump sump during ore grinding and classification - Google Patents
Method and device for controlling liquid level in ore pulp pump sump during ore grinding and classification Download PDFInfo
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Abstract
The invention discloses a method and a device for controlling a liquid level in an ore pulp pump sump during ore grinding and classification. The method comprises the steps of acquiring a first actual liquid level of the pump sump in the beginning of a latest adjustment cycle, and a second actual liquid level of the pump sump at the end of the latest adjustment cycle, calculating a variation value of an ore pulp volume of the pump sump in the latest adjustment cycle according to ore pulp volumes formed by the first actual liquid level and the second actual liquid level in the pump sump respectively, calculating an adjustment value of an output flow based on the variation value of the ore pulp volume, and adjusting the current output flow of the pump sump with the adjustment value of the output flow. With the adoption of the technical scheme, the ore pulp flow output by the pump sump can be adjusted to the flow required to balance ore pulp input and output of the pump sump more precisely according to the adjustment value calculated by the variation value of the ore pulp volume, so that the stable liquid level in the pump sump can be kept more precisely, and an ore grinding and classification effect is more stabilized indirectly.
Description
Technical field
The application relates to Process Control of Mineral Dressing field, particularly relates to the method and apparatus that in a kind of grind grading process, pump pit level is controlled.
Background technology
In the production process of ore smelting, the raw ore ore obtaining due to mining does not reach smelting requirements, needs first 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 of pulverizing are offered to the process of sorting.In grinding process, because ore is pulverized, effectively mineralogical composition can dissociate out from gangue, and different effective mineralogical compositions are dissociated mutually.Grinding operation is to provide the critical process that sorts raw material, and whether the control situation to grinding process can reach suitable granularity by the granularity that directly has influence on ore milling product, and then impact sorts the quality of process and dressing product.
Referring to Fig. 1, show the course of work of ore mill in a kind of grinding process.Mineral aggregate and water are thrown in to ore mill and are mixed respectively, through the ore pulp forming after the pulverizing of ore mill, export again pump pond to, ore pulp in pump pond carries out classification processing by being pumped to grading plant (being generally cyclone), what in grading plant, overflow is the ore pulp that meets particle requirement, enter next stage operation, do not meet the requirements of and return ball mill and carry out grinding again.Wherein, because the situation real-time change such as overflow after the mineral slurry flux of leading portion ore mill output, classification cause the state of the mineral slurry flux in front pump pond in real-time change, in pump pond, the liquid level of ore pulp is understood real-time change, is difficult to keep stable, and in pump pond, the unstable meeting of liquid level has a great impact the effect tool of ore pulp classification.When liquid level is too high in pump pond, easily causes ore pulp overflow from pump pond to go out and cause the loss of ore pulp; When in pump pond, liquid level is too low, air easily enters in pump and causes cavitation erosion, affects the output of pump, thereby has influence on transfer pressure stable of grading plant, has a strong impact on the grading effect of grading plant.Visible, in pump pond, liquid level is stable, is the necessary condition of grind grading process stabilization.
In order to keep the stable of liquid level in pump pond, available technology adopting be that the difference between the actual liquid level based on current time pump pond and default benchmark liquid level regulates the mineral slurry flux of pump pond output in real time so that the liquid level in pump pond is stabilized in benchmark liquid level.But, not identical with the output flow in pump pond owing to causing in pump pond the unsettled reason of page height to be that ore mill is exported to the mineral slurry flux in pump pond, and pump pond is not generally the cylinder that upper and lower floor space is identical, therefore, the difference of pump pond actual liquid level and benchmark liquid level can not reflected pump pond in the input flow rate of ore pulp and the difference between output flow, do not have corresponding relation between the two, therefore, difference based on actual liquid level and benchmark liquid level regulates the output flow in pump pond, will make the adjusting inaccuracy of output flow, thereby cause liquid level in pump pond to be difficult to stablize, thereby the grading effect of grind grading process is affected.
Summary of the invention
The application's technical problem to be solved is, the method and apparatus that provides pump pit level in a kind of grind grading process to control, regulates coarse technical problem with the pump pond output flow solving according to the difference between the actual liquid level based on current time pump pond and default benchmark liquid level is carried out linear correlation and regulated and cause the output flow in pump pond in real time in prior art.
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of method that in grind grading process, pump pit level is controlled, and the method comprises:
Obtain first actual liquid level of pump pond when a nearest regulating cycle starts, and obtain second actual liquid level of described pump pond when a nearest regulating cycle finishes;
The ore pulp volume forming in described pump pond respectively according to described the first actual liquid level and described the second actual liquid level, calculates described pump pond at the changing value of a nearest regulating cycle chats volume of slurry;
Changing value based on described ore pulp volume, calculates the regulated value of output flow, and with the regulated value of described output flow, the current output flow in described pump pond is regulated.
Optionally, the zero hour that described the first actual liquid level is a described nearest regulating cycle liquid level in described pump pond is detected the actual liquid level detected value obtaining, the finish time that described the second actual liquid level is a described nearest regulating cycle liquid level in described pump pond is detected the actual liquid level detected value obtaining.
Optionally, described in obtain first actual liquid level of pump pond when a nearest regulating cycle starts, comprising:
A sense cycle of usining before zero hour of a described nearest regulating cycle is as the first sense cycle, obtain all actual liquid level detected values that described pump pond detected in described the first sense cycle and obtained, and calculate the mean value of all actual liquid level detected values in described the first sense cycle, as described the first actual liquid level;
Described second actual liquid level of described pump pond when a nearest regulating cycle finishes that obtain, comprising:
A sense cycle of usining before finish time of a described nearest regulating cycle is as the second sense cycle, obtain all actual liquid level detected values that described pump pond detected in described the second sense cycle and obtained, and all actual liquid levels that calculate in described the second sense cycle detect all mean value, as described the second actual liquid level.
Optionally, the described regulated value with described output flow regulates the current output flow in described pump pond, comprising:
Obtain current time and detect the actual liquid level detected value obtaining, as current actual liquid level;
More described current actual liquid level and the first default upper limit liquid level, the magnitude relationship between the first bottom limit level; Wherein, described the first upper limit liquid level is greater than default benchmark liquid level, and the first bottom limit level is less than described benchmark liquid level;
In response to described current actual liquid level, be greater than described the first upper limit liquid level, with the absolute value of described regulated value, increase the current output flow in described pump pond;
In response to described current actual liquid level, be less than described the first bottom limit level, with the absolute value of described regulated value, reduce the current output flow in described pump pond;
In response to described current actual liquid level, between described the first upper limit liquid level and described the first bottom limit level, the current output flow sum of described regulated value and described pump pond is redefined as the current output flow in described pump pond.
Optionally, the described changing value based on described ore pulp volume, the regulated value of calculating output flow, comprising:
Obtain current time and detect the actual liquid level detected value obtaining, as current actual liquid level;
More described current actual liquid level and the second default upper limit liquid level, the magnitude relationship between the second bottom limit level; Wherein, described the second upper limit liquid level is greater than default benchmark liquid level, and the second bottom limit level is less than described benchmark liquid level;
In response to described current liquid level between described the second upper limit liquid level and described the second bottom limit level, according to described ore pulp volume changing value and first regulate the product of scale parameter, determine described regulated value;
In response to described current liquid level, be greater than described the second upper limit liquid level or described current liquid level is less than described the second bottom limit level, according to the changing value of described ore pulp volume and second, regulate the product of scale parameter, determine described regulated value;
Wherein, described first regulate scale parameter to be less than described the second adjusting scale parameter.
Optionally, also comprise:
Obtain the adjusting constraint cycle of current time;
More than judging whether moment institute's elapsed time that described current time changes apart from the output flow in described pump of last time pond reaches the described current constraint cycle;
If so, enter the described step current output flow in described pump pond being regulated with the regulated value of described output flow.
Optionally, described in obtain current time the adjusting constraint cycle, comprising:
Obtain current time and detect the actual liquid level detected value obtaining, as current actual liquid level;
The number range of usining under described current actual liquid level, as current liquid level scope, is determined the adjusting constraint cycle of described current time according to described current liquid level scope; Wherein, it is far away that current liquid level scope departs from default benchmark liquid level, and the adjusting constraint cycle of described current time is longer.
In addition, the embodiment of the present application also provides the device that in a kind of grind grading process, pump pit level is controlled, and this device comprises:
The first liquid level acquisition module, for obtaining first actual liquid level of pump pond when a nearest regulating cycle starts;
The second liquid level acquisition module, for obtaining second actual liquid level of described pump pond when a nearest regulating cycle finishes;
Change in volume computing module, the ore pulp volume for forming in described pump pond respectively according to described the first actual liquid level and described the second actual liquid level, calculates described pump pond at the changing value of a nearest regulating cycle chats volume of slurry;
Regulated value computing module, for the changing value based on described ore pulp volume, calculates the regulated value of output flow;
Flow-rate adjustment module, regulates the current output flow in described pump pond for the regulated value with described output flow.
Optionally, the zero hour that described the first actual liquid level is a described nearest regulating cycle liquid level in described pump pond is detected the actual liquid level detected value obtaining, the finish time that described the second actual liquid level is a described nearest regulating cycle liquid level in described pump pond is detected the actual liquid level detected value obtaining.
Optionally, described the first liquid level acquisition module comprises:
The first detected value obtains submodule, for the sense cycle of usining before zero hour of a described nearest regulating cycle, as the first sense cycle, obtain all actual liquid level detected values that in described the first sense cycle, described pump pond detected and obtained;
The first liquid level gauge operator module, for calculating the mean value of all actual liquid level detected values in described the first sense cycle, as described the first actual liquid level;
Described the second liquid level acquisition module comprises:
The second detected value obtains submodule, for the sense cycle of usining before finish time of a described nearest regulating cycle, as the second sense cycle, obtain all actual liquid level detected values that in described the second sense cycle, described pump pond detected and obtained;
The second liquid level gauge operator module, detects all mean value for all actual liquid levels that calculate in described the second sense cycle, as described the second actual liquid level.
Optionally, described Flow-rate adjustment module, comprising:
Current liquid level is obtained submodule, detects the actual liquid level detected value obtaining, as current actual liquid level for obtaining current time;
The first limit value comparison sub-module, for more described current actual liquid level and the first default upper limit liquid level, the magnitude relationship between the first bottom limit level; Wherein, described the first upper limit liquid level is greater than default benchmark liquid level, and the first bottom limit level is less than described benchmark liquid level;
Increase submodule, for be greater than described the first upper limit liquid level in response to described current actual liquid level, with the absolute value of described regulated value, increase the current output flow in described pump pond;
Reduce submodule, for being less than described the first bottom limit level in response to described current actual liquid level, with the absolute value of described regulated value, reduce the current output flow in described pump pond;
Add and submodule, in response to described current actual liquid level between described the first upper limit liquid level and described the first bottom limit level, the current output flow sum of described regulated value and described pump pond is redefined as the current output flow in described pump pond.
Optionally, described regulated value computing module comprises:
Current liquid level is obtained submodule, detects the actual liquid level detected value obtaining, as current actual liquid level for obtaining current time;
The second limit value comparison sub-module, for more described current actual liquid level and the second default upper limit liquid level, the magnitude relationship between the second bottom limit level; Wherein, described the second upper limit liquid level is greater than default benchmark liquid level, and the second bottom limit level is less than described benchmark liquid level;
The first ratio calculating sub module, in response to described current liquid level between described the second upper limit liquid level and described the second bottom limit level, according to described ore pulp volume changing value and first regulate the product of scale parameter, determine described regulated value;
The second ratio calculating sub module, for being greater than described the second upper limit liquid level or described current liquid level is less than described the second bottom limit level in response to described current liquid level, according to the changing value of described ore pulp volume and second, regulate the product of scale parameter, determine described regulated value;
Wherein, described first regulate scale parameter to be less than described the second adjusting scale parameter.
Optionally, also comprise:
Constraint cycle acquisition module, for obtaining the adjusting constraint cycle of current time;
Constraint judge module, more than judging whether moment institute's elapsed time that described current time changes apart from the output flow in described pump of last time pond reaches the described current constraint cycle;
Regulate trigger module, in the situation that judgment result is that of described constraint judge module is to trigger described Flow-rate adjustment module.
Optionally, described constraint cycle acquisition module comprises:
Current liquid level is obtained submodule, detects the actual liquid level detected value obtaining, as current actual liquid level for obtaining current time;
The constraint cycle is determined submodule, for the number range of usining under described current actual liquid level, as current liquid level scope, determines the adjusting constraint cycle of described current time according to described current liquid level scope; Wherein, it is far away that current liquid level scope departs from default benchmark liquid level, and the adjusting constraint cycle of described current time is longer.
Compared with prior art, the application has the following advantages:
The technical scheme of the embodiment of the present application, obtains first actual liquid level of pump pond when a nearest regulating cycle starts, and obtains second actual liquid level of described pump pond when a nearest regulating cycle finishes; The ore pulp volume forming in described pump pond respectively according to described the first actual liquid level and described the second actual liquid level, calculates described pump pond at the changing value of a nearest regulating cycle chats volume of slurry; Changing value based on described ore pulp volume, calculates the regulated value of output flow, and with the regulated value of described output flow, the current output flow in described pump pond is regulated.As can be seen here, because the regulated value of output flow in the embodiment of the present application is to take the changing value of a nearest regulating cycle chats volume of slurry to calculate as benchmark, and the difference between ore pulp is exported in ore pulp volume and pump pond that the variable quantity of ore pulp volume is mineral slurry flux injection pump pond in a nearest regulating cycle of ore mill output, therefore, the regulated value being obtained by the changing value calculating of ore pulp volume can be adjusted to the output flow in pump pond the mineral slurry flux in injection pump pond more accurately, thereby keep more accurately the stable of liquid level in pump pond, thereby make the grading effect of grind grading process more stable.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, the accompanying drawing the following describes is only some embodiment that record in the application, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the course of work schematic diagram of ore mill in grinding process;
Fig. 2 is the basic flow sheet of the embodiment of the method 1 that in the application, in grind grading process, pump pit level is controlled;
Fig. 3 is the schematic diagram of an embodiment of regulating cycle and sense cycle in the embodiment of the present application;
Fig. 4 is the schematic diagram of pump pool structure one embodiment in the embodiment of the present application;
Fig. 5 is that in the embodiment of the present application, the regulated value with output flow regulates the flow chart of an embodiment to the current output flow in pump pond;
Fig. 6 is the flow chart that calculates regulated value one embodiment of output flow in the embodiment of the present application;
Fig. 7 be in the embodiment of the present application in grind grading process pump pit level control the flow chart of another embodiment;
Fig. 8 is the structure chart of the device embodiment 1 that in the application, in grind grading process, pump pit level is controlled;
Fig. 9 is the structure chart of the first liquid level acquisition module 801 1 embodiments in the embodiment of the present application;
Figure 10 is the structure chart of the second liquid level acquisition module 802 1 embodiments in the embodiment of the present application;
Figure 11 is the structure chart of Flow-rate adjustment module 805 1 embodiments in the embodiment of the present application
Figure 12 regulates the structure chart of computing module 804 1 embodiments in the embodiment of the present application;
Figure 13 is the structure chart of the device embodiment 2 that in the application, in grind grading process, pump pit level is controlled;
Figure 14 retrains the structure chart of cycle acquisition module 1,101 one embodiments in the embodiment of the present application.
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.Embodiment based in the application, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the application's protection.
Inventor finds through long-term research, why inaccurate to the control of pump pit level in prior art, be because prior art is difference based between actual liquid level and benchmark liquid level, pump pond output flow to be regulated and realizes pump pit level and control, by actual liquid level in pump pond is adjusted to, in benchmark liquid level, realize the stable of actual liquid level.But, in pump pond, level stability is actually and requires the input flow rate (being ore mill output flow) in pump pond both equate with output flow (ore slurry pump output flow), and relation between actual liquid level and benchmark liquid level can not reflected pump pond input flow rate and output flow between relation, therefore, by actual liquid level in pump pond being adjusted to mineral slurry flux that the mode of benchmark liquid level can cause ore mill output, with respect to the difference of pump pond input flow rate and output flow, excessively regulated or regulated inadequate situation, thereby caused the inaccurate of adjusting.
Based on the above-mentioned of inventor, research and analyse, the application's main thought is: by the changing value of pump pond ore pulp volume in a nearest regulating cycle, calculate the regulated value of output flow, and with this regulated value, the current output flow in pump pond is regulated.Because the ore pulp change in volume value in pump pond is the accumulation in a nearest regulating cycle of deviation between pump pond input flow rate and output flow, the mineral slurry flux of pump pond output can the difference based on pump pond input flow rate and output flow be regulated, realize more accurately the mineral slurry flux of pump pond output is adjusted to the mineral slurry flux that ore mill is exported to pump pond, thereby realize that pump pond output flow is regulated more accurately, keep more accurately stablizing of liquid level pump pond in.
It should be noted that, related noun " ore mill " herein, expression be the grinding attachment using in the grinding process of ore-dressing technique, also can be described as " grinding machine ".Wherein, the technical scheme of the embodiment of the present application is applicable to multiple different grinding attachment, for example ball mill or semi-autogenous mill.
After having introduced the application's basic thought, below in conjunction with accompanying drawing, by embodiment, describe the specific implementation of the method and apparatus that in the application's grind grading process, pump pit level is controlled in detail.
Referring to Fig. 2, show the basic flow sheet of the embodiment of the method 1 that in the application, in grind grading process, pump pit level is controlled.In the present embodiment, described method for example can comprise the following steps:
S201, obtain first actual liquid level of pump pond when a nearest regulating cycle starts, and obtain second actual liquid level of described pump pond when a nearest regulating cycle finishes.
Wherein, a nearest regulating cycle can be take that current time is the finish time one fixing time period of duration.For example, a nearest regulating cycle can be front this time period in 10 seconds of current time.
Be understandable that, the first actual liquid level when a nearest regulating cycle starts, be the actual liquid level of the zero hour of a nearest regulating cycle, similarly, actual liquid level when a nearest regulating cycle finishes, be the actual liquid level of the finish time of a nearest regulating cycle, wherein, the second actual liquid level can be the actual liquid level of current time.It should be noted that, actual liquid level can detect by the moment different the detected value that obtains actual liquid level to the liquid level in pump pond, each actual liquid level constantly can directly adopt this constantly to detect the actual liquid level detected value obtaining to represent, or, also can adopt the mean value of all actual liquid level detected values that detect in the section sometime at this moment place to represent.It should be noted that, actual liquid level detected value with respect to a direct moment of employing, adopt mean value to represent the first actual liquid level and the second actual liquid level, can reduce the impact on the first actual liquid level and the second actual liquid level of the error that detects, make the first actual liquid level and the second actual liquid level more accurate.
For example, in the possible embodiment of the first of S201, the zero hour that described the first actual liquid level is a described nearest regulating cycle liquid level in described pump pond is detected the actual liquid level detected value obtaining, the finish time that described the second actual liquid level is a described nearest regulating cycle liquid level in described pump pond is detected the actual liquid level detected value obtaining.
And for example, in the possible embodiment of the second of S202, the obtain manner of the first actual liquid level, can comprise: a sense cycle of usining before zero hour of a described nearest regulating cycle is as the first sense cycle, obtain all actual liquid level detected values that described pump pond detected in described the first sense cycle and obtained, and calculate the mean value of all actual liquid level detected values in described the first sense cycle, as described the first actual liquid level; Simultaneously, the obtain manner of the second actual liquid level, can comprise: a sense cycle of usining before finish time of a described nearest regulating cycle is as the second sense cycle, obtain all actual liquid level detected values that described pump pond detected in described the second sense cycle and obtained, and all actual liquid levels that calculate in described the second sense cycle detect all mean value, as described the second actual liquid level.Wherein, the duration of the first sense cycle equates with the duration of the second sense cycle, and for example, duration is 20 seconds.Be understandable that, the first sense cycle is different from the finish time of the second sense cycle, and be the zero hour of a nearest regulating cycle finish time of the first sense cycle, and be the finish time of a nearest regulating cycle finish time of the second sense cycle.Each period-luminosity relation as shown in Figure 3, the duration of supposing regulating cycle and sense cycle is identical, wherein, t0 is the finish time of current time, a nearest regulating cycle and the finish time of the second sense cycle, t1 is the zero hour of a nearest regulating cycle and the finish time of the first sense cycle, t2 is the zero hour of the second sense cycle, and t3 is the zero hour of the first sense cycle.
Then return to Fig. 2.After S201 is complete, enter S202.
S202, the ore pulp volume forming in described pump pond respectively according to described the first actual liquid level and described the second actual liquid level, calculate described pump pond at the changing value of a nearest regulating cycle chats volume of slurry.
It should be noted that, the changing value of ore pulp volume in pump pond, relevant with the structure in pump pond, when calculating, need to calculate in conjunction with the structure in pump pond.Wherein, for pump pond arbitrarily, the variable quantity of ore pulp volume can calculate by formula (1):
ΔV=∫∫dsdl （1）
Wherein, △ V is the changing value of ore pulp volume, and s represents that pump pond is at the area at liquid level l place, and for example, liquid level is that the area in 0 o'clock pump pond is its floor space.
For example, Fig. 4 shows a kind of common pump pool structure, and its former and later two sides are inverted trapezoidal, two sides, left and right and upper and lower two bottom surfaces are rectangle, and wherein, the bottom surface length of side is a, b, trapezoidal two hypotenuses and bottom surface angulation are respectively α and β, if the first actual liquid level is l
0, the second actual liquid level is l
1, the changing value of ore pulp volume can calculate by formula (2):
S203, the changing value based on described ore pulp volume, calculate the regulated value of output flow, and with the regulated value of described output flow, the current output flow in described pump pond regulated.
Wherein, between the changing value of ore pulp volume and the regulated value of output flow, have a kind of fixing conversion relation, this conversion relation is that the duration of the corresponding nearest regulating cycle of changing value of the unit that adopts of the numerical value by output flow and ore pulp volume determines.Wherein, in this conversion relation, the relation between the regulated value of output flow and the changing value of ore pulp volume can be expressed as formula (3):
Δv=k·ΔV （3）
Wherein, the regulated value that △ v is output flow, △ V is the changing value of ore pulp volume, k is reduced parameter.
Be understandable that, the adjusting of output flow is identical with the variation of ore pulp volume; When ore pulp volume increases, the changing value of ore pulp volume is greater than 0, and output flow needs to increase, and the regulated value of output flow should be greater than 0; When ore pulp volume reduces, the changing value of ore pulp volume is less than 0, and output flow need to reduce, and the regulated value of output flow should be less than 0.Therefore, the numerical value of k is greater than 0.For example, if the unit of output flow is got cube m/h, the regulated value of output flow is equivalent to the changing value of ore pulp volume in 1 hour, and if the duration of a nearest regulating cycle is 10 seconds, the value of k is 360.
It should be noted that, when actual liquid level departs from default benchmark liquid level and when little, because the adjusting of output flow and the variation of ore pulp volume are consistent, can directly utilize aforementioned regulated value to revise the current output flow in pump pond.But, when actual liquid level departs from benchmark liquid level when excessive, if utilize aforementioned regulated value to revise output flow, may make so actual liquid level always in compared with high or cannot return to benchmark liquid level compared with low situation.In order to depart from benchmark liquid level at actual liquid level, actual liquid level can be returned to benchmark liquid level when excessive, the regulated value that can also adopt the embodiment shown in Fig. 5 to realize with described output flow in the present embodiment regulates the current output flow in described pump pond, comprises particularly:
S501, obtain current time and detect the actual liquid level detected value obtain, as current actual liquid level.
S502, more described current actual liquid level and the first default upper limit liquid level, the magnitude relationship between the first bottom limit level; Wherein, described the first upper limit liquid level is greater than default benchmark liquid level, and the first bottom limit level is less than described benchmark liquid level.
Wherein, the first upper limit liquid level and the first bottom limit level can be set based on maximum level, and for example, 90%, the first bottom limit level that the first upper limit liquid level can be set as maximum level can be set as 20% of maximum level.
S503, in response to described current actual liquid level, be greater than described the first upper limit liquid level, with the absolute value of described regulated value, increase the current output flow in described pump pond.
Particularly, can adopt formula (4) to calculate output flow now:
FI=FI+|Δv| （4）
Wherein, FI is the current output flow in pump pond, the regulated value that △ v is output flow.
S504, in response to described current actual liquid level, be less than described the first bottom limit level, with the absolute value of described regulated value, reduce the current output flow in described pump pond.
Particularly, can adopt formula (5) to calculate output flow now:
FI=FI+Δv （5）
Wherein, FI is the current output flow in pump pond, the regulated value that △ v is output flow.
S505, in response to described current actual liquid level between described the first upper limit liquid level and described the first bottom limit level, the current output flow sum of described regulated value and described pump pond is redefined as the current output flow in described pump pond.
Particularly, can adopt formula (6) to calculate output flow now:
FI=FI-|Δv| （6）
Wherein, FI is the current output flow in pump pond, the regulated value that △ v is output flow.
Be understandable that, between the first upper limit liquid level and the first bottom limit level, also can be further for actual liquid level be delimited a reasonable liquid level interval that comprises benchmark liquid level; If actual liquid level, in this interval, can carry out regulation output flow according to formula (6); If actual liquid level is higher than this interval, can only at ore pulp volume change, being greater than at 0 o'clock carrys out regulation output flow according to formula (6); If actual liquid level is lower than this interval, can only at ore pulp volume change, being less than at 0 o'clock carry out regulation output flow according to formula (6), thus further guarantee the uniformity of actual liquid level and benchmark liquid level.
Then return to Fig. 2.
It should be noted that, actual liquid level is more close to default benchmark liquid level, the adjusting space of output flow is larger, more be not easy to occur the excessively problem of adjusting, and actual liquid level is during more close to the maximum level in pump pond or minimum level, the adjusting space of output flow is less, more easily occurs the problem excessively regulating.For this problem, the present embodiment can also calculate on the basis of output flow regulated value at the changing value based on ore pulp volume, departs from the situation of benchmark liquid level according to actual liquid level, adopts regulated value is carried out to certain adjustment.For example, can calculate by formula (7) regulated value of output flow:
Δv=m·k·ΔV （7）
Wherein, m is for regulating scale parameter, departs from m under the different situations of benchmark liquid level get different numerical value at actual liquid level.
While calculating regulated value based on formula (7), the regulated value that calculates output flow can adopt the mode shown in Fig. 6 particularly, comprising:
S601, obtain current time and detect the actual liquid level detected value obtain, as current actual liquid level.
S602, more described current actual liquid level and the second default upper limit liquid level, the magnitude relationship between the second bottom limit level; Wherein, described the second upper limit liquid level is greater than default benchmark liquid level, and the second bottom limit level is less than described benchmark liquid level.
Wherein, the second upper limit liquid level and the second bottom limit level can be set based on maximum level, and for example, 70%, the second bottom limit level that the second upper limit liquid level can be set as maximum level can be set as 40% of maximum level.
S603, in response to described current liquid level between described the second upper limit liquid level and described the second bottom limit level, according to described ore pulp volume changing value and first regulate the product of scale parameter, determine described regulated value.
S604, in response to described current liquid level, be greater than described the second upper limit liquid level or described current liquid level is less than described the second bottom limit level, according to the changing value of described ore pulp volume and second, regulate the product of scale parameter, determine described regulated value.
Wherein, described first regulate scale parameter m
1be less than described second and regulate scale parameter m
2.For example, m
1can be 1/3, m
2can be 1/2.
Be understandable that, embodiment shown in Fig. 5 and Fig. 6 can be implemented simultaneously, now can adopt the first liquid level upper limit, the second liquid level upper limit, the second liquid level lower limit and the first liquid level lower limit liquid level to be carried out to the division of value region, and the positive and negative of liquid level numerical value interval based under actual liquid level and ore pulp change in volume value determine how to utilize regulated value to calculate output flow.For example, suppose that the first liquid level upper limit, the second liquid level upper limit, the second liquid level lower limit and the first liquid level lower limit reduce successively:
In actual liquid level > the first liquid level, in limited time, actual liquid level belongs to superelevation liquid level district, FI=FI+|m
1k Δ V|;
When the second liquid level upper limit < actual liquid level≤the first liquid level upper limit and ore pulp change in volume value are greater than 0, actual liquid level belongs to high liquid level district, FI=FI+m
1k Δ V;
When the second liquid level upper limit < actual liquid level≤the first liquid level upper limit and ore pulp change in volume value are less than 0, actual liquid level belongs to high liquid level district, FI=FI;
In the second liquid level lower limit≤actual liquid level≤the second liquid level, in limited time, actual liquid level belongs to reasonable liquid level district, FI=FI+m
1k Δ V;
When first liquid level lower limit≤actual liquid level < the second liquid level lower limit and ore pulp change in volume value are greater than 0, actual liquid level belongs to low liquid level district, FI=FI;
When first liquid level lower limit≤actual liquid level < the second liquid level lower limit and ore pulp change in volume value are less than 0, actual liquid level belongs to low liquid level district, FI=FI+m
1k Δ V;
Under actual liquid level < the first liquid level, in limited time, actual liquid level belongs to ultralow liquid level district, FI=FI-|m
1k Δ V|.
Then return to Fig. 2.
In the prior art, the mineral slurry flux of pump pond output is the actual liquid level based on real-time detection and regulating in real time, but because needing the regular hour, the output flow after regulating just can make actual liquid level change, therefore, the mode regulating in real time in prior art regulates too frequent, can cause the excessive adjusting of output flow, make to regulate inaccurate.In the present embodiment, too frequent for fear of regulating, can be set the constraint cycle for twice continuous adjusting, make no longer to regulate in each adjusting a period of time afterwards, after waiting for that actual liquid level puts in place with the output flow variation after regulating, then regulate.Particularly, as shown in Figure 7, the present embodiment can also comprise:
S701, the adjusting constraint cycle of obtaining current time.
Wherein, the mode of obtaining can comprise: obtain current time and detect the actual liquid level detected value obtaining, as current actual liquid level; The number range of usining under described current actual liquid level, as current liquid level scope, is determined the adjusting constraint cycle of described current time according to described current liquid level scope; Wherein, it is far away that current liquid level scope departs from default benchmark liquid level, and the adjusting constraint cycle of described current time is longer.
For example, in the liquid level number range of aforementioned division, when being superelevation liquid level district or ultralow liquid level district, current liquid level scope can adopt the adjusting as current time in the 2 seconds constraint cycle, when current liquid level scope Wei Gao liquid level district Huo Di liquid level district, can adopt the adjusting as current time in the 5 seconds constraint cycle, when current liquid level scope is reasonable liquid level district, can adopt the adjusting as current time in the 10 seconds constraint cycle.
S702, judge whether moment institute's elapsed time that described current time changes apart from the output flow in described pump of last time pond reaches the described current constraint cycle more than; If so, enter S703.
S703, enter the described step current output flow in described pump pond being regulated with the regulated value of described output flow.
By regulating the constraint cycle, the present embodiment can avoid the mineral slurry flux of pump pond output excessively to regulate, and current liquid level scope based on different is selected the different adjusting constraint cycles, can be at actual liquid level excessive or actual liquid level is carried out regulating relatively frequently when too small and carry out relatively lax adjusting at actual liquid level during close to benchmark liquid level, thus can in the situation that keeping pump pit level stable, effectively avoid ore pulp to overflow jumping out and situation that pump pond is vacant occurs.
Then return to Fig. 2.
By the technical scheme of the present embodiment, because the ore pulp change in volume value in pump pond is the accumulation in a nearest regulating cycle of deviation between pump pond input flow rate and output flow, mineral slurry flux that the mineral slurry flux of pump pond output can be based on injection pump pond and the difference of pump pond output flow are regulated, realize more accurately the mineral slurry flux of pump pond output is adjusted to the mineral slurry flux that ore mill is exported to pump pond, thereby realize that pump pond output flow is regulated more accurately, keep more accurately stablizing of liquid level pump pond in.
Corresponding to embodiment of the method, the device that the application also provides a kind of ore grinding pump pond output flow to control.
Referring to Fig. 8, show the structure chart of the device embodiment 1 that in the application, in grind grading process, pump pit level is controlled.In the present embodiment, described device can comprise:
The first liquid level acquisition module 801, for obtaining first actual liquid level of pump pond when a nearest regulating cycle starts;
The second liquid level acquisition module 802, for obtaining second actual liquid level of described pump pond when a nearest regulating cycle finishes;
Change in volume computing module 803, the ore pulp volume for forming in described pump pond respectively according to described the first actual liquid level and described the second actual liquid level, calculates described pump pond at the changing value of a nearest regulating cycle chats volume of slurry;
Regulated value computing module 804, for the changing value based on described ore pulp volume, calculates the regulated value of output flow;
Flow-rate adjustment module 805, regulates the current output flow in described pump pond for the regulated value with described output flow.
Wherein, optionally, the zero hour that described the first actual liquid level is a described nearest regulating cycle liquid level in described pump pond is detected the actual liquid level detected value obtaining, the finish time that described the second actual liquid level is a described nearest regulating cycle liquid level in described pump pond is detected the actual liquid level detected value obtaining.
Wherein, optional, in a kind of the first liquid level acquisition module 801 embodiments as shown in Figure 9, described the first liquid level acquisition module 801 can comprise:
The first detected value obtains submodule 901, for the sense cycle of usining before zero hour of a described nearest regulating cycle, as the first sense cycle, obtain all actual liquid level detected values that in described the first sense cycle, described pump pond detected and obtained;
The first liquid level gauge operator module 902, for calculating the mean value of all actual liquid level detected values in described the first sense cycle, as described the first actual liquid level;
Wherein, optional, in a kind of the second liquid level acquisition module 802 embodiments as shown in figure 10, described the second liquid level acquisition module 802 can comprise:
The second detected value obtains submodule 1001, for the sense cycle of usining before finish time of a described nearest regulating cycle, as the second sense cycle, obtain all actual liquid level detected values that in described the second sense cycle, described pump pond detected and obtained;
The second liquid level gauge operator module 1002, detects all mean value for all actual liquid levels that calculate in described the second sense cycle, as described the second actual liquid level.
Wherein, optional, in a kind of Flow-rate adjustment module 805 embodiments as shown in figure 11, described Flow-rate adjustment module 805 can comprise:
Current liquid level is obtained submodule 1101, detects the actual liquid level detected value obtaining, as current actual liquid level for obtaining current time;
The first limit value comparison sub-module 1102, for more described current actual liquid level and the first default upper limit liquid level, the magnitude relationship between the first bottom limit level; Wherein, described the first upper limit liquid level is greater than default benchmark liquid level, and the first bottom limit level is less than described benchmark liquid level;
Reduce submodule 1104, for being less than described the first bottom limit level in response to described current actual liquid level, with the absolute value of described regulated value, reduce the current output flow in described pump pond;
Add and submodule 1105, in response to described current actual liquid level between described the first upper limit liquid level and described the first bottom limit level, the current output flow sum of described regulated value and described pump pond is redefined as the current output flow in described pump pond.
Wherein, optional, in a kind of adjusting computing module 804 embodiments as shown in figure 12, described regulated value computing module 804 can comprise:
Current liquid level is obtained submodule 1101, detects the actual liquid level detected value obtaining, as current actual liquid level for obtaining current time;
The second limit value comparison sub-module 1201, for more described current actual liquid level and the second default upper limit liquid level, the magnitude relationship between the second bottom limit level; Wherein, described the second upper limit liquid level is greater than default benchmark liquid level, and the second bottom limit level is less than described benchmark liquid level;
The first ratio calculating sub module 1202, in response to described current liquid level between described the second upper limit liquid level and described the second bottom limit level, according to described ore pulp volume changing value and first regulate the product of scale parameter, determine described regulated value;
The second ratio calculating sub module 1203, for being greater than described the second upper limit liquid level or described current liquid level is less than described the second bottom limit level in response to described current liquid level, according to the changing value of described ore pulp volume and second, regulate the product of scale parameter, determine described regulated value;
Wherein, described first regulate scale parameter to be less than described the second adjusting scale parameter.
Referring to Figure 13, show the structure chart of the device embodiment 2 that in the application, in grind grading process, pump pit level is controlled.In the present embodiment, except all structures shown in Fig. 8, can also comprise:
Constraint cycle acquisition module 1301, for obtaining the adjusting constraint cycle of current time;
Regulate trigger module 1303, in the situation that judgment result is that of described constraint judge module 1302 is to trigger described Flow-rate adjustment module 805.
Wherein, optional, as shown in figure 14, in a kind of constraint cycle acquisition module 1301 embodiments in the present embodiment, described constraint cycle acquisition module 1301 can comprise:
Current liquid level is obtained submodule 1401, detects the actual liquid level detected value obtaining, as current actual liquid level for obtaining current time;
The constraint cycle is determined submodule 1402, for the number range of usining under described current actual liquid level, as current liquid level scope, determines the adjusting constraint cycle of described current time according to described current liquid level scope; Wherein, it is far away that current liquid level scope departs from default benchmark liquid level, and the adjusting constraint cycle of described current time is longer.
By the application's device embodiment, because the ore pulp change in volume value in pump pond is the accumulation in a nearest regulating cycle of deviation between pump pond input flow rate and output flow, mineral slurry flux that the mineral slurry flux of pump pond output can be based on injection pump pond and the difference of pump pond output flow are regulated, realize more accurately the mineral slurry flux of pump pond output is adjusted to the mineral slurry flux that ore mill is exported to pump pond, thereby realize that pump pond output flow is regulated more accurately, keep more accurately stablizing of liquid level pump pond in.
It should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.Term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being 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 is referring to the part explanation of embodiment of the method.Device embodiment described above is only schematic, the wherein said unit as separating component explanation can or can not be also physically to separate, the parts that show as unit can be or can not be also physical locations, can be positioned at a place, or also can be distributed on a plurality of NEs.Can select according to the actual needs some or all of module wherein to realize the object of the present embodiment scheme.Those of ordinary skills, in the situation that not paying creative work, are appreciated that and implement.
The above is only the application's the specific embodiment; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of 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 grind grading process, pump pit level is controlled, is characterized in that, comprising:
Obtain first actual liquid level of pump pond when a nearest regulating cycle starts, and obtain second actual liquid level of described pump pond when a nearest regulating cycle finishes;
The ore pulp volume forming in described pump pond respectively according to described the first actual liquid level and described the second actual liquid level, calculates described pump pond at the changing value of a nearest regulating cycle chats volume of slurry;
Changing value based on described ore pulp volume, calculates the regulated value of output flow, and with the regulated value of described output flow, the current output flow in described pump pond is regulated.
2. method according to claim 1, it is characterized in that, the zero hour that described the first actual liquid level is a described nearest regulating cycle liquid level in described pump pond is detected the actual liquid level detected value obtaining, the finish time that described the second actual liquid level is a described nearest regulating cycle liquid level in described pump pond is detected the actual liquid level detected value obtaining.
3. method according to claim 1, is characterized in that, described in obtain first actual liquid level of pump pond when a nearest regulating cycle starts, comprising:
A sense cycle of usining before zero hour of a described nearest regulating cycle is as the first sense cycle, obtain all actual liquid level detected values that described pump pond detected in described the first sense cycle and obtained, and calculate the mean value of all actual liquid level detected values in described the first sense cycle, as described the first actual liquid level;
Described second actual liquid level of described pump pond when a nearest regulating cycle finishes that obtain, comprising:
A sense cycle of usining before finish time of a described nearest regulating cycle is as the second sense cycle, obtain all actual liquid level detected values that described pump pond detected in described the second sense cycle and obtained, and all actual liquid levels that calculate in described the second sense cycle detect all mean value, as described the second actual liquid level.
4. method according to claim 1, is characterized in that, the described regulated value with described output flow regulates the current output flow in described pump pond, comprising:
Obtain current time and detect the actual liquid level detected value obtaining, as current actual liquid level;
More described current actual liquid level and the first default upper limit liquid level, the magnitude relationship between the first bottom limit level; Wherein, described the first upper limit liquid level is greater than default benchmark liquid level, and the first bottom limit level is less than described benchmark liquid level;
In response to described current actual liquid level, be greater than described the first upper limit liquid level, with the absolute value of described regulated value, increase the current output flow in described pump pond;
In response to described current actual liquid level, be less than described the first bottom limit level, with the absolute value of described regulated value, reduce the current output flow in described pump pond;
In response to described current actual liquid level, between described the first upper limit liquid level and described the first bottom limit level, the current output flow sum of described regulated value and described pump pond is redefined as the current output flow in described pump pond.
5. method according to claim 1, is characterized in that, the described changing value based on described ore pulp volume, and the regulated value of calculating output flow, comprising:
Obtain current time and detect the actual liquid level detected value obtaining, as current actual liquid level;
More described current actual liquid level and the second default upper limit liquid level, the magnitude relationship between the second bottom limit level; Wherein, described the second upper limit liquid level is greater than default benchmark liquid level, and the second bottom limit level is less than described benchmark liquid level;
In response to described current liquid level between described the second upper limit liquid level and described the second bottom limit level, according to described ore pulp volume changing value and first regulate the product of scale parameter, determine described regulated value;
In response to described current liquid level, be greater than described the second upper limit liquid level or described current liquid level is less than described the second bottom limit level, according to the changing value of described ore pulp volume and second, regulate the product of scale parameter, determine described regulated value;
Wherein, described first regulate scale parameter to be less than described the second adjusting scale parameter.
6. method according to claim 1, is characterized in that, also comprises:
Obtain the adjusting constraint cycle of current time;
More than judging whether moment institute's elapsed time that described current time changes apart from the output flow in described pump of last time pond reaches the described current constraint cycle;
If so, enter the described step current output flow in described pump pond being regulated with the regulated value of described output flow.
7. method according to claim 6, is characterized in that, described in obtain current time the adjusting constraint cycle, comprising:
Obtain current time and detect the actual liquid level detected value obtaining, as current actual liquid level;
The number range of usining under described current actual liquid level, as current liquid level scope, is determined the adjusting constraint cycle of described current time according to described current liquid level scope; Wherein, it is far away that current liquid level scope departs from default benchmark liquid level, and the adjusting constraint cycle of described current time is longer.
8. the device that in grind grading process, pump pit level is controlled, is characterized in that, comprising:
The first liquid level acquisition module, for obtaining first actual liquid level of pump pond when a nearest regulating cycle starts;
The second liquid level acquisition module, for obtaining second actual liquid level of described pump pond when a nearest regulating cycle finishes;
Change in volume computing module, the ore pulp volume for forming in described pump pond respectively according to described the first actual liquid level and described the second actual liquid level, calculates described pump pond at the changing value of a nearest regulating cycle chats volume of slurry;
Regulated value computing module, for the changing value based on described ore pulp volume, calculates the regulated value of output flow;
Flow-rate adjustment module, regulates the current output flow in described pump pond for the regulated value with described output flow.
9. device according to claim 8, it is characterized in that, the zero hour that described the first actual liquid level is a described nearest regulating cycle liquid level in described pump pond is detected the actual liquid level detected value obtaining, the finish time that described the second actual liquid level is a described nearest regulating cycle liquid level in described pump pond is detected the actual liquid level detected value obtaining.
10. device according to claim 8, is characterized in that, described the first liquid level acquisition module comprises:
The first detected value obtains submodule, for the sense cycle of usining before zero hour of a described nearest regulating cycle, as the first sense cycle, obtain all actual liquid level detected values that in described the first sense cycle, described pump pond detected and obtained;
The first liquid level gauge operator module, for calculating the mean value of all actual liquid level detected values in described the first sense cycle, as described the first actual liquid level;
Described the second liquid level acquisition module comprises:
The second detected value obtains submodule, for the sense cycle of usining before finish time of a described nearest regulating cycle, as the second sense cycle, obtain all actual liquid level detected values that in described the second sense cycle, described pump pond detected and obtained;
The second liquid level gauge operator module, detects all mean value for all actual liquid levels that calculate in described the second sense cycle, as described the second actual liquid level.
11. devices according to claim 8, is characterized in that, described Flow-rate adjustment module, comprising:
Current liquid level is obtained submodule, detects the actual liquid level detected value obtaining, as current actual liquid level for obtaining current time;
The first limit value comparison sub-module, for more described current actual liquid level and the first default upper limit liquid level, the magnitude relationship between the first bottom limit level; Wherein, described the first upper limit liquid level is greater than default benchmark liquid level, and the first bottom limit level is less than described benchmark liquid level;
Increase submodule, for be greater than described the first upper limit liquid level in response to described current actual liquid level, with the absolute value of described regulated value, increase the current output flow in described pump pond;
Reduce submodule, for being less than described the first bottom limit level in response to described current actual liquid level, with the absolute value of described regulated value, reduce the current output flow in described pump pond;
Add and submodule, in response to described current actual liquid level between described the first upper limit liquid level and described the first bottom limit level, the current output flow sum of described regulated value and described pump pond is redefined as the current output flow in described pump pond.
12. devices according to claim 8, is characterized in that, described regulated value computing module comprises:
Current liquid level is obtained submodule, detects the actual liquid level detected value obtaining, as current actual liquid level for obtaining current time;
The second limit value comparison sub-module, for more described current actual liquid level and the second default upper limit liquid level, the magnitude relationship between the second bottom limit level; Wherein, described the second upper limit liquid level is greater than default benchmark liquid level, and the second bottom limit level is less than described benchmark liquid level;
The first ratio calculating sub module, in response to described current liquid level between described the second upper limit liquid level and described the second bottom limit level, according to described ore pulp volume changing value and first regulate the product of scale parameter, determine described regulated value;
The second ratio calculating sub module, for being greater than described the second upper limit liquid level or described current liquid level is less than described the second bottom limit level in response to described current liquid level, according to the changing value of described ore pulp volume and second, regulate the product of scale parameter, determine described regulated value;
Wherein, described first regulate scale parameter to be less than described the second adjusting scale parameter.
13. devices according to claim 8, is characterized in that, also comprise:
Constraint cycle acquisition module, for obtaining the adjusting constraint cycle of current time;
Constraint judge module, more than judging whether moment institute's elapsed time that described current time changes apart from the output flow in described pump of last time pond reaches the described current constraint cycle;
Regulate trigger module, in the situation that judgment result is that of described constraint judge module is to trigger described Flow-rate adjustment module.
14. devices according to claim 13, is characterized in that, described constraint cycle acquisition module comprises:
Current liquid level is obtained submodule, detects the actual liquid level detected value obtaining, as current actual liquid level for obtaining current time;
The constraint cycle is determined submodule, for the number range of usining under described current actual liquid level, as current liquid level scope, determines the adjusting constraint cycle of described current time according to described current liquid level scope; Wherein, it is far away that current liquid level scope departs from default benchmark liquid level, and the adjusting constraint cycle of described current time is longer.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104635770A (en) * | 2015-01-09 | 2015-05-20 | 山西太钢不锈钢股份有限公司 | Classifier control method based on pulp pump sump liquid level as main control parameter |
| CN104624411B (en) * | 2014-12-24 | 2017-04-05 | 中冶长天国际工程有限责任公司 | The method and apparatus of transfer pressure control during a kind of grind grading |
| CN106959606A (en) * | 2016-01-08 | 2017-07-18 | 石家庄金垦科技有限公司 | Dynamic equalization regulation and control method in concentrate sorting system |
| CN110389601A (en) * | 2018-09-07 | 2019-10-29 | 沈阳化工股份有限公司 | A kind of control method, device and the equipment of stable liquid level |
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2013
- 2013-12-24 CN CN201310722091.5A patent/CN103691544B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104624411B (en) * | 2014-12-24 | 2017-04-05 | 中冶长天国际工程有限责任公司 | The method and apparatus of transfer pressure control during a kind of grind grading |
| CN104635770A (en) * | 2015-01-09 | 2015-05-20 | 山西太钢不锈钢股份有限公司 | Classifier control method based on pulp pump sump liquid level as main control parameter |
| CN106959606A (en) * | 2016-01-08 | 2017-07-18 | 石家庄金垦科技有限公司 | Dynamic equalization regulation and control method in concentrate sorting system |
| CN110389601A (en) * | 2018-09-07 | 2019-10-29 | 沈阳化工股份有限公司 | A kind of control method, device and the equipment of stable liquid level |
| CN110389601B (en) * | 2018-09-07 | 2022-07-12 | 沈阳化工股份有限公司 | Control method, device and equipment for stabilizing liquid level |
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