CN103691544B - The method and apparatus that in a kind of grind grading process, ore slurry pump pit level controls - Google Patents
The method and apparatus that in a kind of grind grading process, ore slurry pump pit level controls Download PDFInfo
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- CN103691544B CN103691544B CN201310722091.5A CN201310722091A CN103691544B CN 103691544 B CN103691544 B CN 103691544B CN 201310722091 A CN201310722091 A CN 201310722091A CN 103691544 B CN103691544 B CN 103691544B
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Abstract
The invention discloses the method and apparatus that in a kind of grind grading process, ore slurry pump pit level controls.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 at the end of a nearest regulating cycle; According to the pulp volume that described first actual liquid level and described second actual liquid level are formed respectively in described pump pond, calculate the changing value of described pump pond pulp volume in a nearest regulating cycle; Based on the changing value of described pulp volume, calculate the regulated value of output flow, and regulate with the output flow that the regulated value of described output flow is current to described pump pond.By the technical scheme of the application, more accurately the mineral slurry flux that pump pond exports can be adjusted to the flow met required for pump pond ore pulp input and output balance by the calculated regulated value of the changing value of pulp volume, thus keep the stable of liquid level in pump pond more accurately, indirectly make the effect of grind grading more stable.
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 controls.
Background technology
In the production process of ore smelting, owing to digging up mine, the raw ore ore obtained does not reach smelting requirements, needs first to carry out ore dressing to raw ore ore, thus obtains the concentrate meeting smelting requirements, be used further to smelting process.The links such as ore-dressing practice mainly comprises crushing and screening, grind grading to raw ore ore, sorts, essence mine dehydration.Wherein, grinding process is by the ore grinding of fragmentation to suitable granularity, and the mineral pulverized are supplied to the process of sorting.In grinding process, because ore is pulverized, effective mineralogical composition can dissociate out from gangue, and different effective mineralogical composition is dissociated mutually.Grinding operation is to provide the critical process sorting raw material, to the control situation of grinding process, whether the granularity directly having influence on ore milling product can be reached suitable granularity, and then impact sorts the quality of process and dressing product.
See Fig. 1, show the course of work of ore mill in a kind of grinding process.Mineral aggregate and water are mixed to ore mill by input respectively, the ore pulp formed after the pulverizing of ore mill exports pump pond again to, ore pulp in pump pond carries out classification process by being pumped to grading plant (being generally cyclone), what overflow in grading plant is the ore pulp meeting particle requirement, enter next stage operation, do not meet the requirements of the grinding returning ball mill and carry out again.Wherein, the mineral slurry flux exported due to leading portion ore mill, the situation real-time change such as overflow and cause the mineral slurry flux in front pump pond to be in the state of real-time change after classification, in pump pond, the liquid level of ore pulp is understood real-time change, is difficult to keep stable, and in pump pond, the instability of liquid level can have a great impact the effect tool of ore pulp classification.When liquid level is too high in pump pond, ore pulp overflow from pump pond is easily caused 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, thus has influence on the stable of the transfer pressure of grading plant, has a strong impact on the grading effect of grading plant.Visible, in pump pond, liquid level is stablized, and is the necessary condition of grind grading process stabilization.
In order to keep the stable of liquid level in pump pond, what adopt in prior art is regulate the mineral slurry flux that pump pond exports based on the difference between the actual liquid level in current time pump pond and default datum level in real time, is stabilized in datum level to make the liquid level in pump pond.But, be that owing to causing the reason of page height instability in pump pond the mineral slurry flux in pump pond exported to by ore mill not identical with the output flow 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 datum level can not difference in reflected pump pond between the input flow rate of ore pulp and output flow, do not have corresponding relation between the two, therefore, difference based on actual liquid level and datum level regulates the output flow in pump pond, the adjustment inaccuracy of output flow will be made, thus cause liquid level in pump pond to be difficult to stablize, thus the grading effect of grind grading process is affected.
Summary of the invention
Technical problems to be solved in this application are, the method and apparatus that pump pit level in a kind of grind grading process controls is provided, based on the difference between the actual liquid level in current time pump pond and default datum level, the output flow in pump pond is regulated with carrying out linear correlation in real time and the pump pond output flow that causes regulates coarse technical problem to solve conventionally.
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 controls, 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 at the end of a nearest regulating cycle;
According to the pulp volume that described first actual liquid level and described second actual liquid level are formed respectively in described pump pond, calculate the changing value of described pump pond pulp volume in a nearest regulating cycle;
Based on the changing value of described pulp volume, calculate the regulated value of output flow, and regulate with the output flow that the regulated value of described output flow is current to described pump pond.
Optionally, described first actual liquid level is that the liquid level of start time to described pump pond of a described nearest regulating cycle detects the actual liquid level detected value obtained, and described second actual liquid level is that the liquid level of finish time to described pump pond of a described nearest regulating cycle detects the actual liquid level detected value obtained.
Optionally, first actual liquid level of described acquisition pump pond when a nearest regulating cycle starts, comprising:
Using a sense cycle before the start time of a described nearest regulating cycle as the first sense cycle, obtain in described first sense cycle and described pump pond is detected and all actual liquid level detected values of obtaining, and calculate the mean value of all actual liquid level detected values in described first sense cycle, as described first actual liquid level;
Second actual liquid level of described acquisition described pump pond at the end of a nearest regulating cycle, comprising:
Using a sense cycle before the finish time of a described nearest regulating cycle as the second sense cycle, obtain in described second sense cycle and described pump pond is detected and all actual liquid level detected values of obtaining, and all actual liquid levels calculated in described second sense cycle detect the mean value in week, as described second actual liquid level.
Optionally, the described output flow current to described pump pond with the regulated value of described output flow regulates, and comprising:
Obtain current time and detect the actual liquid level detected value obtained, as current actual liquid level;
Magnitude relationship between more described current actual liquid level and the first default upper limit level, the first bottom limit level; Wherein, described first upper limit level is greater than default datum level, and the first bottom limit level is less than described datum level;
Be greater than described first upper limit level in response to described current actual liquid level, increase the current output flow in described pump pond with the absolute value of described regulated value;
Be less than described first bottom limit level in response to described current actual liquid level, reduce the current output flow in described pump pond with the absolute value of described regulated value;
In response to described current actual liquid level between described first upper limit level and described 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 pulp volume, calculates the regulated value of output flow, comprising:
Obtain current time and detect the actual liquid level detected value obtained, as current actual liquid level;
Magnitude relationship between more described current actual liquid level and the second default upper limit level, the second bottom limit level; Wherein, described second upper limit level is greater than default datum level, and the second bottom limit level is less than described datum level;
In response to described current level between described second upper limit level and described second bottom limit level, according to described pulp volume changing value and first regulate the product of scale parameter, determine described regulated value;
Be greater than described second upper limit level in response to described current level or described current level is less than described second bottom limit level, regulate the product of scale parameter according to the changing value and second of described pulp volume, determine described regulated value;
Wherein, described first scale parameter is regulated to be less than described second adjustment scale parameter.
Optionally, also comprise:
Obtain the adjustment constraint cycle of current time;
Judge whether moment institute's elapsed time that described current time changes apart from the output flow in last described pump pond reaches the described present confinement cycle more than;
If so, the described step regulated with the output flow that the regulated value of described output flow is current to described pump pond is entered.
Optionally, in the adjustment constraint cycle of described acquisition current time, comprising:
Obtain current time and detect the actual liquid level detected value obtained, as current actual liquid level;
Using the number range belonging to described current actual liquid level as current level scope, determine the adjustment constraint cycle of described current time according to described current level scope; Wherein, it is far away that current level scope departs from default datum level, and the adjustment constraint cycle of described current time is longer.
In addition, the embodiment of the present application additionally provides the device that in a kind of grind grading process, pump pit level controls, and this device comprises:
First liquid level acquisition module, for obtaining first actual liquid level of pump pond when a nearest regulating cycle starts;
Second liquid level acquisition module, for obtaining second actual liquid level of described pump pond at the end of a nearest regulating cycle;
Volume Changes computing module, for the pulp volume formed in described pump pond respectively according to described first actual liquid level and described second actual liquid level, calculates the changing value of described pump pond pulp volume in a nearest regulating cycle;
Regulated value computing module, for the changing value based on described pulp volume, calculates the regulated value of output flow;
Flow-rate adjustment module, regulates for the output flow current to described pump pond with the regulated value of described output flow.
Optionally, described first actual liquid level is that the liquid level of start time to described pump pond of a described nearest regulating cycle detects the actual liquid level detected value obtained, and described second actual liquid level is that the liquid level of finish time to described pump pond of a described nearest regulating cycle detects the actual liquid level detected value obtained.
Optionally, described first liquid level acquisition module comprises:
First detected value obtains submodule, for a sense cycle before the start time of a described nearest regulating cycle as the first sense cycle, obtain in described first sense cycle and described pump pond is detected and all actual liquid level detected values of obtaining;
First liquid level gauge operator module, for calculating the mean value of all actual liquid level detected values in described first sense cycle, as described first actual liquid level;
Described second liquid level acquisition module comprises:
Second detected value obtains submodule, for a sense cycle before the finish time of a described nearest regulating cycle as the second sense cycle, obtain in described second sense cycle and described pump pond is detected and all actual liquid level detected values of obtaining;
Second liquid level gauge operator module, detects the mean value in week, as described second actual liquid level for all actual liquid levels calculated in described second sense cycle.
Optionally, described Flow-rate adjustment module, comprising:
Current level obtains submodule, detects the actual liquid level detected value obtained, as current actual liquid level for obtaining current time;
First limit value comparison sub-module, for the magnitude relationship between more described current actual liquid level and the first default upper limit level, the first bottom limit level; Wherein, described first upper limit level is greater than default datum level, and the first bottom limit level is less than described datum level;
Increasing submodule, for being greater than described first upper limit level in response to described current actual liquid level, increasing the current output flow in described pump pond with the absolute value of described regulated value;
Reducing submodule, for being less than described first bottom limit level in response to described current actual liquid level, reducing the current output flow in described pump pond with the absolute value of described regulated value;
Add and submodule, in response to described current actual liquid level between described first upper limit level and described 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 level obtains submodule, detects the actual liquid level detected value obtained, as current actual liquid level for obtaining current time;
Second limit value comparison sub-module, for the magnitude relationship between more described current actual liquid level and the second default upper limit level, the second bottom limit level; Wherein, described second upper limit level is greater than default datum level, and the second bottom limit level is less than described datum level;
First ratio calculating sub module, in response to described current level between described second upper limit level and described second bottom limit level, according to described pulp volume changing value and first regulate the product of scale parameter, determine described regulated value;
Second ratio calculating sub module, for being greater than described second upper limit level in response to described current level or described current level is less than described second bottom limit level, regulate the product of scale parameter according to the changing value and second of described pulp volume, determine described regulated value;
Wherein, described first scale parameter is regulated to be less than described second adjustment scale parameter.
Optionally, also comprise:
Constraint cycle acquisition module, for obtaining the adjustment constraint cycle of current time;
Constraint judge module, for judging whether moment institute's elapsed time that described current time changes apart from the output flow in last described pump pond reaches the described present confinement cycle more than;
Regulating trigger module, for when the judged result of described constraint judge module is for being, triggering described Flow-rate adjustment module.
Optionally, described constraint cycle acquisition module comprises:
Current level obtains submodule, detects the actual liquid level detected value obtained, as current actual liquid level for obtaining current time;
The constraint cycle determines submodule, for using the number range belonging to described current actual liquid level as current level scope, determines the adjustment constraint cycle of described current time according to described current level scope; Wherein, it is far away that current level scope departs from default datum level, and the adjustment 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 at the end of a nearest regulating cycle; According to the pulp volume that described first actual liquid level and described second actual liquid level are formed respectively in described pump pond, calculate the changing value of described pump pond pulp volume in a nearest regulating cycle; Based on the changing value of described pulp volume, calculate the regulated value of output flow, and regulate with the output flow that the regulated value of described output flow is current to described pump pond.As can be seen here, because the regulated value of output flow in the embodiment of the present application is for benchmark calculates with the changing value of pulp volume in a nearest regulating cycle, and the variable quantity of the pulp volume pulp volume in mineral slurry flux injection pump pond in a nearest regulating cycle that to be namely ore mill export and pump pond export the difference between ore pulp, therefore, more accurately the output flow in pump pond can be adjusted to the mineral slurry flux in injection pump pond by the calculated regulated value of the changing value of pulp volume, thus keep the stable of liquid level in pump pond more accurately, thus 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, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
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 pump pit level controls in grind grading process in the application;
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 the flow chart carrying out adjustment one embodiment in the embodiment of the present application with the output flow that the regulated value of output flow is current to pump pond;
Fig. 6 is the flow chart of regulated value one embodiment calculating output flow in the embodiment of the present application;
Fig. 7 is that in the embodiment of the present application, in grind grading process, pump pit level controls the flow chart of another embodiment;
Fig. 8 is the structure chart of the device embodiment 1 that pump pit level controls in grind grading process in the application;
Fig. 9 is the structure chart of the first liquid level acquisition module 801 1 embodiment in the embodiment of the present application;
Figure 10 is the structure chart of the second liquid level acquisition module 802 1 embodiment in the embodiment of the present application;
Figure 11 is the structure chart of Flow-rate adjustment module 805 1 embodiment in the embodiment of the present application
Figure 12 is the structure chart of regulating calculation module 804 1 embodiment in the embodiment of the present application;
Figure 13 is the structure chart of the device embodiment 2 that pump pit level controls in grind grading process in the application;
Figure 14 is the structure chart retraining cycle acquisition module 1,101 one embodiment in the embodiment of the present application.
Detailed description of the invention
The application's scheme is understood better in order to make those skilled in the art person, 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 some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained 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, being because prior art regulates pump pond output flow based on the difference between actual liquid level and datum level and realizes pump pit level and control, namely datum level realizing the stable of actual liquid level by being adjusted to by actual liquid level in pump pond.But, in pump pond, level stability is actually and requires that both the input flow rate in pump pond (i.e. ore mill output flow) and output flow (ore slurry pump output flow) are equal, and relation between actual liquid level and datum level can not relation between reflected pump pond input flow rate and output flow, therefore, the mineral slurry flux that ore mill can be caused to export by the mode that actual liquid level in pump pond is adjusted to datum level is excessively regulated or is regulated inadequate situation relative to the difference of pump pond input flow rate and output flow, thus causes the inaccurate of adjustment.
Research and analyse based on the above-mentioned of inventor, the main thought of the application is: by the changing value of pump pond pulp volume in a nearest regulating cycle, calculate the regulated value of output flow, and regulate with the output flow that this regulated value is current to pump pond.Namely pulp volume changing value due to pump pond is the accumulation of deviation in a nearest regulating cycle between pump pond input flow rate and output flow, the mineral slurry flux that pump pond is exported can regulate based on the difference of pump pond input flow rate and output flow, the mineral slurry flux realized pump pond exports more accurately is adjusted to the mineral slurry flux that pump pond exported to by ore mill, thus realize regulating more accurately pump pond output flow, keep the stable of liquid level in pump pond more accurately.
It should be noted that, noun " ore mill " involved herein, expression be the grinding attachment used 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, such as ball mill or semi-autogenous mill.
After the basic thought describing the application, below in conjunction with accompanying drawing, described in detail the specific implementation of the method and apparatus that pump pit level controls in the application's grind grading process by embodiment.
See Fig. 2, show the basic flow sheet of the embodiment of the method 1 that pump pit level controls in grind grading process in the application.In the present embodiment, described method such as can comprise the following steps:
S201, first actual liquid level of acquisition pump pond when a nearest regulating cycle starts, and obtain second actual liquid level of described pump pond at the end of a nearest regulating cycle.
Wherein, a nearest regulating cycle can be the time period of the fixing duration taking current time as finish time.Such as, a nearest regulating cycle can be this time period in 10 seconds before current time.
Be understandable that, the first actual liquid level when a nearest regulating cycle starts, be the actual liquid level of the start time of a nearest regulating cycle, similarly, actual liquid level at the end of a nearest regulating cycle, 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 be detected by the liquid level in the different moment to pump pond and obtain the detected value of actual liquid level, the actual liquid level in each moment can directly adopt this moment to detect the actual liquid level detected value obtained to represent, or, the mean value of all actual liquid level detected values detected also can be adopted in the section sometime at this moment place to represent.It should be noted that, relative to the actual liquid level detected value directly adopting a moment, mean value is adopted to represent the first actual liquid level and the second actual liquid level, the error that can reduce to detect on the impact of the first actual liquid level and the second actual liquid level, make the first actual liquid level and the second actual liquid level more accurate.
Such as, in the first possible embodiment of S201, described first actual liquid level is that the liquid level of start time to described pump pond of a described nearest regulating cycle detects the actual liquid level detected value obtained, and described second actual liquid level is that the liquid level of finish time to described pump pond of a described nearest regulating cycle detects the actual liquid level detected value obtained.
And for example, in the embodiment that the second of S202 is possible, the obtain manner of the first actual liquid level, can comprise: using a sense cycle before the start time of a described nearest regulating cycle as the first sense cycle, obtain in described first sense cycle and described pump pond is detected and all actual liquid level detected values of obtaining, and calculate the mean value of all actual liquid level detected values in described first sense cycle, as described first actual liquid level; Simultaneously, the obtain manner of the second actual liquid level, can comprise: using a sense cycle before the finish time of a described nearest regulating cycle as the second sense cycle, obtain in described second sense cycle and described pump pond is detected and all actual liquid level detected values of obtaining, and all actual liquid levels calculated in described second sense cycle detect the mean value in week, as described second actual liquid level.Wherein, the duration of the first sense cycle is equal with the duration of the second sense cycle, and such as, duration is 20 seconds.Be understandable that, the first sense cycle is different from the finish time of the second sense cycle, and the finish time of the first sense cycle is the start time of a nearest regulating cycle, and the finish time of the second sense cycle is the finish time of a nearest regulating cycle.Each period-luminosity relation as shown in Figure 3, suppose that the duration of regulating cycle and sense cycle is identical, wherein, t0 is current time, the finish time of a nearest regulating cycle and the finish time of the second sense cycle, t1 is the start time of a nearest regulating cycle and the finish time of the first sense cycle, t2 is the start time of the second sense cycle, and t3 is the start time of the first sense cycle.
Then Fig. 2 is returned.After S201 is complete, enter S202.
S202, the pulp volume formed in described pump pond respectively according to described first actual liquid level and described second actual liquid level, calculate the changing value of described pump pond pulp volume in a nearest regulating cycle.
It should be noted that, the changing value of pulp volume in pump pond, relevant with the structure in pump pond, need the structure in conjunction with pump pond to calculate when calculating.Wherein, for arbitrary pump pond, the variable quantity of pulp volume can pass through formula (1) and calculate:
ΔV=∫∫dsdl（1）
Wherein, △ V is the changing value of pulp volume, and s represents the area of pump pond at liquid level l place, and such as, when liquid level is 0, the area in pump pond is its floor space.
Such as, 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, then the changing value of pulp volume can pass through formula (2) and calculates:
S203, changing value based on described pulp volume, calculate the regulated value of output flow, and regulate with the output flow that the regulated value of described output flow is current to described pump pond.
Wherein, there is a kind of fixing conversion relation between the changing value of pulp volume and the regulated value of output flow, this conversion relation is that the duration of a nearest regulating cycle corresponding to the changing value of unit and the pulp volume adopted by the numerical value of output flow determines.Wherein, in this conversion relation, the relation between the regulated value of output flow and the changing value of pulp volume can be expressed as formula (3):
Δv=k·ΔV（3）
Wherein, △ v is the regulated value of output flow, and △ V is the changing value of pulp volume, and k is reduced parameter.
Be understandable that, the adjustment of output flow is identical with the change of pulp volume; When pulp volume increases, the changing value of pulp volume is greater than 0, then output flow needs to increase, and the regulated value of output flow should be greater than 0; When pulp volume reduces, the changing value of pulp volume is less than 0, then output flow needs to reduce, and the regulated value of output flow should be less than 0.Therefore, the numerical value of k is greater than 0.Such as, if the unit of output flow to be got cube m/h, then the regulated value of output flow is equivalent to the changing value of pulp volume in 1 hour, and if the duration of a nearest regulating cycle is 10 seconds, then the value of k is 360.
It should be noted that, when actual liquid level departs from default datum level and be little, because the adjustment of output flow is consistent with the change of pulp volume, can directly utilize the aforementioned regulated value output flow current to pump pond to revise.But, when actual liquid level depart from datum level excessive time, if utilize aforementioned regulated value to revise output flow, actual liquid level so may be made to be in higher or lower situation always and cannot datum level to be returned to.In order to depart from actual liquid level datum level excessive time actual liquid level can be returned to datum level, the embodiment shown in Fig. 5 can also be adopted realize in the present embodiment and regulate with the output flow that the regulated value of described output flow is current to described pump pond, comprise particularly:
S501, acquisition current time detect the actual liquid level detected value obtained, as current actual liquid level.
Magnitude relationship between S502, more described current actual liquid level and the first default upper limit level, the first bottom limit level; Wherein, described first upper limit level is greater than default datum level, and the first bottom limit level is less than described datum level.
Wherein, the first upper limit level and the first bottom limit level can set based on maximum level, and such as, the first upper limit level can be set as 90% of maximum level, and the first bottom limit level can be set as 20% of maximum level.
S503, be greater than described first upper limit level in response to described current actual liquid level, increase the current output flow in described pump pond with the absolute value of described regulated value.
Particularly, formula (4) can be adopted to calculate output flow now:
FI=FI+|Δv|（4）
Wherein, FI is the current output flow in pump pond, and △ v is the regulated value of output flow.
S504, be less than described first bottom limit level in response to described current actual liquid level, reduce the current output flow in described pump pond with the absolute value of described regulated value.
Particularly, formula (5) can be adopted to calculate output flow now:
FI=FI+Δv（5）
Wherein, FI is the current output flow in pump pond, and △ v is the regulated value of output flow.
S505, in response to described current actual liquid level between described first upper limit level and described 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, formula (6) can be adopted to calculate output flow now:
FI=FI-|Δv|（6）
Wherein, FI is the current output flow in pump pond, and △ v is the regulated value of output flow.
Be understandable that, between the first upper limit level and the first bottom limit level, also can further for actual liquid level delimits the reasonable liquid level interval that comprises datum level; If actual liquid level is in this interval, then can carry out regulation output flow according to formula (6); If actual liquid level is interval higher than this, then only can carry out regulation output flow when pulp volume variable quantity is greater than 0 according to formula (6); If actual liquid level is interval lower than this, then only can carrys out regulation output flow when pulp volume variable quantity is less than 0 according to formula (6), thus ensure the uniformity of actual liquid level and datum level further.
Then Fig. 2 is returned.
It should be noted that, actual liquid level is more close to the datum level preset, the adjustment space of output flow is larger, more be not easy the problem occurring excessively regulating, and during maximum level or the minimum level of actual liquid level more close to pump pond, the adjustment space of output flow is less, more easily occurs the problem excessively regulated.For this problem, the present embodiment can also calculate on the basis of output flow regulated value at the changing value based on pulp volume, departs from the situation of datum level, adopt and carry out certain adjustment to regulated value according to actual liquid level.Such as, the regulated value that formula (7) calculates output flow can be passed through:
Δv=m·k·ΔV（7）
Wherein, m is for regulating scale parameter, and depart from the different situations of datum level at actual liquid level under, m gets different numerical value.
When calculating regulated value based on formula (7), the regulated value calculating output flow can adopt the mode shown in Fig. 6 particularly, comprising:
S601, acquisition current time detect the actual liquid level detected value obtained, as current actual liquid level.
Magnitude relationship between S602, more described current actual liquid level and the second default upper limit level, the second bottom limit level; Wherein, described second upper limit level is greater than default datum level, and the second bottom limit level is less than described datum level.
Wherein, the second upper limit level and the second bottom limit level can set based on maximum level, and such as, the second upper limit level can be set as 70% of maximum level, and the second bottom limit level can be set as 40% of maximum level.
S603, in response to described current level between described second upper limit level and described second bottom limit level, according to described pulp volume changing value and first regulate the product of scale parameter, determine described regulated value.
S604, be greater than described second upper limit level in response to described current level or described current level is less than described second bottom limit level, regulate the product of scale parameter according to the changing value and second of described pulp volume, determine described regulated value.
Wherein, described first scale parameter m is regulated
1be less than described second and regulate scale parameter m
2.Such as, 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, 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 now can be adopted to carry out the division of value region to liquid level, and determine how to utilize regulated value to calculate output flow based on the liquid level numerical intervals belonging to actual liquid level and the positive and negative of pulp volume changing value.Such as, 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, then:
When actual liquid level > first liquid level is prescribed a time limit, then 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 pulp volume changing value is greater than 0 time, then 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 pulp volume changing value is less than 0 time, then actual liquid level belongs to high liquid level district, FI=FI;
When the second liquid level lower limit≤actual liquid level≤the second liquid level is prescribed a time limit, then actual liquid level belongs to reasonable liquid level district, FI=FI+m
1k Δ V;
When the first liquid level lower limit≤actual liquid level < second liquid level lower limit and pulp volume changing value is greater than 0 time, then actual liquid level belongs to low liquid level district, FI=FI;
When the first liquid level lower limit≤actual liquid level < second liquid level lower limit and pulp volume changing value is less than 0 time, then actual liquid level belongs to low liquid level district, FI=FI+m
1k Δ V;
When actual liquid level < the first liquid level lower limit, then actual liquid level belongs to ultralow liquid level district, FI=FI-|m
1k Δ V|.
Then Fig. 2 is returned.
In the prior art, the mineral slurry flux that pump pond exports regulates in real time based on the actual liquid level detected in real time, but because the output flow after regulating needs the regular hour that actual liquid level just can be made to change, therefore, the mode regulated in real time in prior art regulates too frequent, the excessive adjustment of output flow can be caused, make adjustment inaccurate.In the present embodiment, too frequent in order to avoid regulating, can be that twice continuous print regulates and arrange the constraint cycle, make no longer to regulate in a period of time after each adjustment, after waiting for that actual liquid level puts in place with the output flow change after regulating, then regulate.Particularly, as shown in Figure 7, the present embodiment can also comprise:
The adjustment constraint cycle of S701, acquisition current time.
Wherein, the mode of acquisition can comprise: obtain current time and detect the actual liquid level detected value obtained, as current actual liquid level; Using the number range belonging to described current actual liquid level as current level scope, determine the adjustment constraint cycle of described current time according to described current level scope; Wherein, it is far away that current level scope departs from default datum level, and the adjustment constraint cycle of described current time is longer.
Such as, in the liquid level number range of aforementioned division, when current level scope be superelevation liquid level district or ultralow liquid level district time can adopt the adjustment as current time in 2 seconds retrain the cycle, when current level scope be high liquid level district or low liquid level district time can adopt the adjustment as current time in 5 seconds retrain the cycle, can adopt when current level scope is reasonable liquid level district the adjustment as current time in 10 seconds retrain the cycle.
S702, judge whether moment institute's elapsed time that described current time changes apart from the output flow in last described pump pond reaches the described present confinement cycle more than; If so, S703 is entered.
S703, enter the described step regulated with the output flow that the regulated value of described output flow is current to described pump pond.
By regulating the constraint cycle, the present embodiment can avoid the mineral slurry flux to pump pond exports excessively to regulate, and select the different adjustment constraint cycles based on different current level scopes, can actual liquid level excessive or too small time the adjustment of related frequency is carried out to actual liquid level and at actual liquid level close to carrying out relatively lax adjustment during datum level, thus can effectively avoid when keeping pump pit level stable ore pulp to overflow jumping out and situation that pump pond is vacant occurs.
Then Fig. 2 is returned.
By the technical scheme of the present embodiment, namely pulp volume changing value due to pump pond is the accumulation of deviation in a nearest regulating cycle between pump pond input flow rate and output flow, the mineral slurry flux that pump pond is exported can regulate based on the difference of the mineral slurry flux in injection pump pond and pump pond output flow, the mineral slurry flux realized pump pond exports more accurately is adjusted to the mineral slurry flux that pump pond exported to by ore mill, thus realize regulating more accurately pump pond output flow, keep the stable of liquid level in pump pond more accurately.
Corresponding to embodiment of the method, present invention also provides the device that a kind of ore grinding pump pond output flow controls.
See Fig. 8, show the structure chart of the device embodiment 1 that pump pit level controls in grind grading process in the application.In the present embodiment, described device can comprise:
First liquid level acquisition module 801, for obtaining first actual liquid level of pump pond when a nearest regulating cycle starts;
Second liquid level acquisition module 802, for obtaining second actual liquid level of described pump pond at the end of a nearest regulating cycle;
Volume Changes computing module 803, for the pulp volume formed in described pump pond respectively according to described first actual liquid level and described second actual liquid level, calculates the changing value of described pump pond pulp volume in a nearest regulating cycle;
Regulated value computing module 804, for the changing value based on described pulp volume, calculates the regulated value of output flow;
Flow-rate adjustment module 805, regulates for the output flow current to described pump pond with the regulated value of described output flow.
Wherein, optionally, described first actual liquid level is that the liquid level of start time to described pump pond of a described nearest regulating cycle detects the actual liquid level detected value obtained, and described second actual liquid level is that the liquid level of finish time to described pump pond of a described nearest regulating cycle detects the actual liquid level detected value obtained.
Wherein, optionally, in one first liquid level acquisition module 801 embodiment as shown in Figure 9, described first liquid level acquisition module 801 can comprise:
First detected value obtains submodule 901, for a sense cycle before the start time of a described nearest regulating cycle as the first sense cycle, obtain in described first sense cycle and described pump pond is detected and all actual liquid level detected values of obtaining;
First liquid level gauge operator module 902, for calculating the mean value of all actual liquid level detected values in described first sense cycle, as described first actual liquid level;
Wherein, optionally, in one second liquid level acquisition module 802 embodiment as shown in Figure 10, described second liquid level acquisition module 802 can comprise:
Second detected value obtains submodule 1001, for a sense cycle before the finish time of a described nearest regulating cycle as the second sense cycle, obtain in described second sense cycle and described pump pond is detected and all actual liquid level detected values of obtaining;
Second liquid level gauge operator module 1002, detects the mean value in week, as described second actual liquid level for all actual liquid levels calculated in described second sense cycle.
Wherein, optionally, in a kind of Flow-rate adjustment module 805 embodiment as shown in figure 11, described Flow-rate adjustment module 805 can comprise:
Current level obtains submodule 1101, detects the actual liquid level detected value obtained, as current actual liquid level for obtaining current time;
First limit value comparison sub-module 1102, for the magnitude relationship between more described current actual liquid level and the first default upper limit level, the first bottom limit level; Wherein, described first upper limit level is greater than default datum level, and the first bottom limit level is less than described datum level;
Increasing submodule 1103, for being greater than described first upper limit level in response to described current actual liquid level, increasing the current output flow in described pump pond with the absolute value of described regulated value;
Reducing submodule 1104, for being less than described first bottom limit level in response to described current actual liquid level, reducing the current output flow in described pump pond with the absolute value of described regulated value;
Add and submodule 1105, in response to described current actual liquid level between described first upper limit level and described 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, optionally, in a kind of regulating calculation module 804 embodiment as shown in figure 12, described regulated value computing module 804 can comprise:
Current level obtains submodule 1101, detects the actual liquid level detected value obtained, as current actual liquid level for obtaining current time;
Second limit value comparison sub-module 1201, for the magnitude relationship between more described current actual liquid level and the second default upper limit level, the second bottom limit level; Wherein, described second upper limit level is greater than default datum level, and the second bottom limit level is less than described datum level;
First ratio calculating sub module 1202, in response to described current level between described second upper limit level and described second bottom limit level, according to described pulp volume changing value and first regulate the product of scale parameter, determine described regulated value;
Second ratio calculating sub module 1203, for being greater than described second upper limit level in response to described current level or described current level is less than described second bottom limit level, regulate the product of scale parameter according to the changing value and second of described pulp volume, determine described regulated value;
Wherein, described first scale parameter is regulated to be less than described second adjustment scale parameter.
See Figure 13, show the structure chart of the device embodiment 2 that pump pit level controls in grind grading process in the application.In the present embodiment, except all structures shown in Fig. 8, can also comprise:
Constraint cycle acquisition module 1301, for obtaining the adjustment constraint cycle of current time;
Constraint judge module 1302, for judging whether moment institute's elapsed time that described current time changes apart from the output flow in last described pump pond reaches the described present confinement cycle more than;
Regulating trigger module 1303, for when the judged result of described constraint judge module 1302 is for being, triggering described Flow-rate adjustment module 805.
Wherein, optionally, as shown in figure 14, in one constraint cycle acquisition module 1301 embodiment in the present embodiment, described constraint cycle acquisition module 1301 can comprise:
Current level obtains submodule 1401, detects the actual liquid level detected value obtained, as current actual liquid level for obtaining current time;
The constraint cycle determines submodule 1402, for using the number range belonging to described current actual liquid level as current level scope, determines the adjustment constraint cycle of described current time according to described current level scope; Wherein, it is far away that current level scope departs from default datum level, and the adjustment constraint cycle of described current time is longer.
By the device embodiment of the application, namely pulp volume changing value due to pump pond is the accumulation of deviation in a nearest regulating cycle between pump pond input flow rate and output flow, the mineral slurry flux that pump pond is exported can regulate based on the difference of the mineral slurry flux in injection pump pond and pump pond output flow, the mineral slurry flux realized pump pond exports more accurately is adjusted to the mineral slurry flux that pump pond exported to by ore mill, thus realize regulating more accurately pump pond output flow, keep the stable of liquid level in pump pond more accurately.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.Term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
For device embodiment, because it corresponds essentially to embodiment of the method, so relevant part illustrates see the part of embodiment of the method.Device embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed on multiple NE.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
The above is only the detailed description of the invention of the application; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the protection domain of the application.
Claims (14)
1. the method that in grind grading process, pump pit level controls, 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 at the end of a nearest regulating cycle;
According to the pulp volume that described first actual liquid level and described second actual liquid level are formed respectively in described pump pond, calculate the changing value of described pump pond pulp volume in a nearest regulating cycle;
Based on the changing value of described pulp volume, calculate the regulated value of output flow, and regulate with the output flow that the regulated value of described output flow is current to described pump pond.
2. method according to claim 1, it is characterized in that, described first actual liquid level is that the liquid level of start time to described pump pond of a described nearest regulating cycle detects the actual liquid level detected value obtained, and described second actual liquid level is that the liquid level of finish time to described pump pond of a described nearest regulating cycle detects the actual liquid level detected value obtained.
3. method according to claim 1, is characterized in that, first actual liquid level of described acquisition pump pond when a nearest regulating cycle starts, comprising:
Using a sense cycle before the start time of a described nearest regulating cycle as the first sense cycle, obtain in described first sense cycle and described pump pond is detected and all actual liquid level detected values of obtaining, and calculate the mean value of all actual liquid level detected values in described first sense cycle, as described first actual liquid level;
Second actual liquid level of described acquisition described pump pond at the end of a nearest regulating cycle, comprising:
Using a sense cycle before the finish time of a described nearest regulating cycle as the second sense cycle, obtain in described second sense cycle and described pump pond is detected and all actual liquid level detected values of obtaining, and calculate the mean value of all actual liquid level detected values in described second sense cycle, as described second actual liquid level.
4. method according to claim 1, is characterized in that, the described output flow current to described pump pond with the regulated value of described output flow regulates, and comprising:
Obtain current time and detect the actual liquid level detected value obtained, as current actual liquid level;
Magnitude relationship between more described current actual liquid level and the first default upper limit level, the first bottom limit level; Wherein, described first upper limit level is greater than default datum level, and the first bottom limit level is less than described datum level;
Be greater than described first upper limit level in response to described current actual liquid level, increase the current output flow in described pump pond with the absolute value of described regulated value;
Be less than described first bottom limit level in response to described current actual liquid level, reduce the current output flow in described pump pond with the absolute value of described regulated value;
In response to described current actual liquid level between described first upper limit level and described 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 pulp volume, calculates the regulated value of output flow, comprising:
Obtain current time and detect the actual liquid level detected value obtained, as current actual liquid level;
Magnitude relationship between more described current actual liquid level and the second default upper limit level, the second bottom limit level; Wherein, described second upper limit level is greater than default datum level, and the second bottom limit level is less than described datum level;
In response to described current level between described second upper limit level and described second bottom limit level, according to described pulp volume changing value and first regulate the product of scale parameter, determine described regulated value;
Be greater than described second upper limit level in response to described current level or described current level is less than described second bottom limit level, regulate the product of scale parameter according to the changing value and second of described pulp volume, determine described regulated value;
Wherein, described first scale parameter is regulated to be less than described second adjustment scale parameter.
6. method according to claim 1, is characterized in that, also comprises:
Obtain the adjustment constraint cycle of current time;
Judge whether moment institute's elapsed time that described current time changes apart from the output flow in last described pump pond reaches the described present confinement cycle more than;
If so, the described step regulated with the output flow that the regulated value of described output flow is current to described pump pond is entered.
7. method according to claim 6, is characterized in that, in the adjustment constraint cycle of described acquisition current time, comprising:
Obtain current time and detect the actual liquid level detected value obtained, as current actual liquid level;
Using the number range belonging to described current actual liquid level as current level scope, determine the adjustment constraint cycle of described current time according to described current level scope; Wherein, it is far away that current level scope departs from default datum level, and the adjustment constraint cycle of described current time is shorter.
8. the device that in grind grading process, pump pit level controls, is characterized in that, comprising:
First liquid level acquisition module, for obtaining first actual liquid level of pump pond when a nearest regulating cycle starts;
Second liquid level acquisition module, for obtaining second actual liquid level of described pump pond at the end of a nearest regulating cycle;
Volume Changes computing module, for the pulp volume formed in described pump pond respectively according to described first actual liquid level and described second actual liquid level, calculates the changing value of described pump pond pulp volume in a nearest regulating cycle;
Regulated value computing module, for the changing value based on described pulp volume, calculates the regulated value of output flow;
Flow-rate adjustment module, regulates for the output flow current to described pump pond with the regulated value of described output flow.
9. device according to claim 8, it is characterized in that, described first actual liquid level is that the liquid level of start time to described pump pond of a described nearest regulating cycle detects the actual liquid level detected value obtained, and described second actual liquid level is that the liquid level of finish time to described pump pond of a described nearest regulating cycle detects the actual liquid level detected value obtained.
10. device according to claim 8, is characterized in that, described first liquid level acquisition module comprises:
First detected value obtains submodule, for a sense cycle before the start time of a described nearest regulating cycle as the first sense cycle, obtain in described first sense cycle and described pump pond is detected and all actual liquid level detected values of obtaining;
First liquid level gauge operator module, for calculating the mean value of all actual liquid level detected values in described first sense cycle, as described first actual liquid level;
Described second liquid level acquisition module comprises:
Second detected value obtains submodule, for a sense cycle before the finish time of a described nearest regulating cycle as the second sense cycle, obtain in described second sense cycle and described pump pond is detected and all actual liquid level detected values of obtaining;
Second liquid level gauge operator module, for calculating the mean value of all actual liquid level detected values in described second sense cycle, as described second actual liquid level.
11. devices according to claim 8, is characterized in that, described Flow-rate adjustment module, comprising:
Current level obtains submodule, detects the actual liquid level detected value obtained, as current actual liquid level for obtaining current time;
First limit value comparison sub-module, for the magnitude relationship between more described current actual liquid level and the first default upper limit level, the first bottom limit level; Wherein, described first upper limit level is greater than default datum level, and the first bottom limit level is less than described datum level;
Increasing submodule, for being greater than described first upper limit level in response to described current actual liquid level, increasing the current output flow in described pump pond with the absolute value of described regulated value;
Reducing submodule, for being less than described first bottom limit level in response to described current actual liquid level, reducing the current output flow in described pump pond with the absolute value of described regulated value;
Add and submodule, in response to described current actual liquid level between described first upper limit level and described 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 level obtains submodule, detects the actual liquid level detected value obtained, as current actual liquid level for obtaining current time;
Second limit value comparison sub-module, for the magnitude relationship between more described current actual liquid level and the second default upper limit level, the second bottom limit level; Wherein, described second upper limit level is greater than default datum level, and the second bottom limit level is less than described datum level;
First ratio calculating sub module, in response to described current level between described second upper limit level and described second bottom limit level, according to described pulp volume changing value and first regulate the product of scale parameter, determine described regulated value;
Second ratio calculating sub module, for being greater than described second upper limit level in response to described current level or described current level is less than described second bottom limit level, regulate the product of scale parameter according to the changing value and second of described pulp volume, determine described regulated value;
Wherein, described first scale parameter is regulated to be less than described second adjustment scale parameter.
13. devices according to claim 8, is characterized in that, also comprise:
Constraint cycle acquisition module, for obtaining the adjustment constraint cycle of current time;
Constraint judge module, for judging whether moment institute's elapsed time that described current time changes apart from the output flow in last described pump pond reaches the described present confinement cycle more than;
Regulating trigger module, for when the judged result of described constraint judge module is for being, triggering described Flow-rate adjustment module.
14. devices according to claim 13, is characterized in that, described constraint cycle acquisition module comprises:
Current level obtains submodule, detects the actual liquid level detected value obtained, as current actual liquid level for obtaining current time;
The constraint cycle determines submodule, for using the number range belonging to described current actual liquid level as current level scope, determines the adjustment constraint cycle of described current time according to described current level scope; Wherein, it is far away that current level scope departs from default datum level, and the adjustment constraint cycle of described current time is shorter.
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