CN104475240A - Classification pressure control method and classification pressure control device in grinding-classification process - Google Patents

Classification pressure control method and classification pressure control device in grinding-classification process Download PDF

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CN104475240A
CN104475240A CN201410815721.8A CN201410815721A CN104475240A CN 104475240 A CN104475240 A CN 104475240A CN 201410815721 A CN201410815721 A CN 201410815721A CN 104475240 A CN104475240 A CN 104475240A
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pressure
value
current
change threshold
cyclone
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CN104475240B (en
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李宗平
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Zhongye Changtian International Engineering Co Ltd
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Zhongye Changtian International Engineering Co Ltd
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Abstract

The embodiment of the application discloses a classification pressure control method and a classification pressure control device in a grinding-classification process. The method comprises the following steps: detecting the current pressure valve of a classification device; calculating the current pressure change value according to the difference between the current pressure value and a preset pressure value; analyzing the numerical range of the current pressure value and the numerical range of the current pressure change value; increasing the swirler starting quantity in response to conditions that the current pressure value is greater than a reasonable upper pressure limit value and the current pressure change value is greater than a first change threshold; keeping the swirler starting quantity constant in response to conditions that the current pressure value is greater than the reasonable upper pressure limit value and the current pressure change value is less than the first change threshold; reducing the swirler starting quantity in response to conditions that the current pressure value is less than a reasonable lower pressure limit value and the current pressure change value is less than a second change threshold; and keeping the swirler starting quantity constant in response to conditions that the current pressure value is less than the reasonable lower pressure limit value and the current pressure change value is less than the second change threshold.

Description

The method and apparatus that in a kind of grind grading process, transfer pressure controls
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, transfer pressure 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 is delivered to grading plant (being generally hydrocyclone) by ore slurry pump and is carried out classification process, 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, what grading plant generally adopted is hydrocyclone.Particularly, in hydrocyclone, owing to there is granularity difference or density contrast between coarse granule and fine grained, varying in size of the power such as centrifugal force, centripetal buoyancy, fluid drag that both are subject to, major part fine grained is discharged by overflow pipe suitable for reading under the effect of eddy flow, and coarse granule then throws to a barrel wall, glides along bucket wall, discharge from end opening, thus realize coarse granule and fine grain classification.
It should be noted that, because ore pulp delivers to grading plant by ore slurry pump from pump pond, under the many factors impacts such as the mineral pulp level in pump pond and ore pulp pump lift, the transfer pressure (hydraulic pressure as hydrocyclone) of grading plant is also unstable but can real-time change, and the instability of transfer pressure can have a great impact the effect tool of ore pulp classification.When transfer pressure is too low, many fine graineds cannot be separated, and when transfer pressure is too high, then can cause to comprise coarse granule and fine grain ore pulp overflows simultaneously.Visible, only have and keep transfer pressure to be stabilized in rational scope, the grading effect of guarantee ore pulp.
In order to keep the stable of transfer pressure, what adopt in prior art is regulate based on the frequency of difference to ore slurry pump between the actual transfer pressure of current classification device and default reference pressure in real time, to regulate ore slurry pump to the pressure of grading plant transfer ore pulp, thus the transfer pressure of grading plant is stabilized in reference pressure.But, due to the frequency of ore slurry pump change after ore slurry pump to the ore pulp that grading plant is carried need the regular hour just can reach with regulate after the transfer pressure that adapts of frequency, for the adjustment of this frequency adjustment is complete from the transfer pressure that is adjusted to of ore slurry pump frequency there is the regular hour postpones, therefore, prior art is by regulating ore slurry pump frequency based on the difference between actual transfer pressure and reference pressure in real time, transfer pressure is not also regulated for last secondary frequencies and does not adjust and completely just once more have adjusted ore slurry pump frequency, this tend causes the excessive adjustment of transfer pressure, the fluctuation causing transfer pressure larger and 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 transfer pressure in a kind of grind grading process controls being provided, excessively adjusting and fluctuating large technical problem to solve the transfer pressure caused according to regulating ore slurry pump frequency based on the difference between actual transfer pressure and reference pressure in real time conventionally.
For solving the problems of the technologies described above, this application provides a kind of method that in grind grading process, transfer pressure controls, the method comprises:
Detect the transfer pressure of grading plant at current time, as current pressure values;
The detected value obtained before a nearest measurement period using transfer pressure, as in first force value, according to described current pressure values and described difference between first force value, calculates current pressure changing value;
Analyze the number range belonging to described current pressure values and the number range belonging to described current pressure changing value;
Reasonable upper pressure limit value is greater than and described current pressure changing value is greater than the first change threshold in response to described current pressure values, be increased to the first quantity with the current unlatching quantity of the first regulated quantity by cyclone in grading plant, to control the transfer pressure of described grading plant by the cyclone opening described first quantity;
Reasonable upper pressure limit value is greater than and described current pressure changing value is less than the first change threshold in response to described current pressure values, keep the current unlatching quantity of cyclone in described grading plant constant, to control the transfer pressure of described grading plant by the cyclone opening described current unlatching quantity;
Reasonable low pressure limit value is less than and described current pressure changing value is less than the second change threshold in response to described current pressure values, with the second regulated quantity, the current unlatching quantity of cyclone in described grading plant is reduced to the second quantity, to control the transfer pressure of described grading plant by the cyclone opening described second quantity;
Reasonable low pressure limit value is less than and described current pressure changing value is greater than the second change threshold in response to described current pressure values, keep the current unlatching quantity of cyclone in described grading plant constant, to control the transfer pressure of described grading plant by the cyclone opening described current unlatching quantity;
Wherein, described reasonable upper pressure limit value is greater than described reasonable low pressure limit value, and described first change threshold is not more than 0, and described second change threshold is not less than 0.
In addition, this application provides the device that in a kind of grind grading process, transfer pressure controls, this device comprises:
Detection module, for detecting the transfer pressure of grading plant at current time, as current pressure values;
Computing module, for the detected value that obtains before a nearest measurement period using transfer pressure as in first force value, according to described current pressure values and described difference between first force value, calculates current pressure changing value;
Analysis module, for analyzing the number range belonging to described current pressure values and the number range belonging to described current pressure changing value;
First increases module, for being greater than reasonable upper pressure limit value in response to described current pressure values and described current pressure changing value is greater than the first change threshold, with the first regulated quantity, the current unlatching quantity of cyclone in grading plant is increased to the first quantity, to control the transfer pressure of described grading plant by the cyclone opening described first quantity;
First keeps module, for being greater than reasonable upper pressure limit value in response to described current pressure values and described current pressure changing value is less than the first change threshold, keep the current unlatching quantity of cyclone in described grading plant constant, to control the transfer pressure of described grading plant by the cyclone opening described current unlatching quantity;
First reduces module, for being less than reasonable low pressure limit value in response to described current pressure values and described current pressure changing value is less than the second change threshold, with the second regulated quantity, the current unlatching quantity of cyclone in described grading plant is reduced to the second quantity, to control the transfer pressure of described grading plant by the cyclone opening described second quantity;
Second keeps module, for being less than reasonable low pressure limit value in response to described current pressure values and described current pressure changing value is greater than the second change threshold, keep the current unlatching quantity of cyclone in described grading plant constant, to control the transfer pressure of described grading plant by the cyclone opening described current unlatching quantity;
Wherein, described reasonable upper pressure limit value is greater than described reasonable low pressure limit value, and described first change threshold is not more than 0, and described second change threshold is not less than 0.
Compared with prior art, the present invention has the following advantages:
There is provided according to the application's embodiment, for the method and apparatus that transfer pressure in grind grading process controls, the adjustment that transfer pressure in grading plant opens quantity by cyclone in grading plant controls, and the pressure trend embodied according to the current pressure values of transfer pressure and the change value of pressure in a period of time recently determines that the regulative mode of quantity opened by cyclone simultaneously, specifically, when current pressure values is higher than zone of reasonableness, if nearest pressure change presents the reduction trend of increase tendency or underswing, increase the unlatching quantity of cyclone, if nearest pressure change presents the reduction trend of enough amplitudes, keep the unlatching quantity of cyclone constant, and when current pressure values is lower than zone of reasonableness, if nearest pressure change presents the increase tendency of reduction trend or underswing, reduce the unlatching quantity of cyclone, if nearest pressure change presents the increase tendency of enough amplitudes, refuse the frequency increasing ore slurry pump, as can be seen here, when transfer pressure does not also adjust complete for this frequency adjustment, even if current pressure values does not also adjust to zone of reasonableness, change value of pressure also can embody pressure trend to be enough to that transfer pressure is changed to and to be adjusted to zone of reasonableness, now keep the unlatching quantity of cyclone constant, and no longer regulate according to the skew of current pressure values relative to zone of reasonableness, so just can avoid the excessive adjustment of transfer pressure, transfer pressure is made to keep stable, thus improve the grading effect of grind grading process.
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 flow chart of method one embodiment that transfer pressure controls in grind grading process in the application;
Fig. 3 is the flow chart of regulating frequency one embodiment when current pressure is in zone of reasonableness in the embodiment of the present application;
Fig. 4 is the flow chart of another embodiment of method that transfer pressure controls in grind grading process in the application;
Fig. 5 is the flow chart of device one embodiment that transfer pressure controls in grind grading process in the 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 research, why prior art can produce the problem that transfer pressure excessively adjusts, it is realized by the adjustment of ore slurry pump frequency that reason to be in prior art the control of transfer pressure, and the regulative mode of ore slurry pump frequency is only determine according to the difference between the currency of actual transfer pressure and default reference pressure.Specifically, once detect that current pressure values departs from zone of reasonableness, prior art will adopt the frequency adjustment mode adapted relative to the skew of reference pressure with current pressure values, also namely current pressure values higher than reducing frequency adjustment and current pressure values during reference pressure lower than increasing frequency adjustment during reference pressure, but, the change that frequency adjustment due to ore slurry pump feeds back to transfer pressure has certain time delay, when frequency regulates suitable, transfer pressure does not adapt to suitable frequency completely toward contact, now transfer pressure still departs from reference pressure, but now prior art will continue to regulate to suitable frequency, thus cause the excessive adjustment of frequency and the excessive adjustment of transfer pressure.
Based on above-mentioned analysis, one of main thought of the application is: the problem excessively adjusted in order to avoid transfer pressure, on the one hand, transfer pressure in grading plant can be controlled by the adjustment of cyclone unlatching quantity in grading plant, transfer pressure is controlled with respect to adjustment ore slurry pump, control directly by regulating grading plant to realize transfer pressure has less time delay, on the other hand, cyclone opens the regulative mode of quantity simultaneously according to the current pressure values of transfer pressure and the change value of pressure in nearest a period of time, and when current pressure values departs from zone of reasonableness, if what change value of pressure embodied is be not enough to make transfer pressure be changed to the pressure trend of zone of reasonableness, cyclone is regulated to open quantity according to current pressure values relative to the skew of zone of reasonableness, if what change value of pressure embodied is be enough to make transfer pressure be changed to the pressure trend of zone of reasonableness, cyclone is no longer regulated to open quantity, therefore, when transfer pressure does not also adjust complete for this frequency adjustment, even if current pressure values does not also adjust to zone of reasonableness, change value of pressure also can embody to be enough to make transfer pressure be changed to the pressure trend of zone of reasonableness, the unlatching quantity of cyclone now just can be kept constant, thus avoid the excessive adjustment of transfer pressure, transfer pressure is made to keep stable, thus improve the grading effect of grind grading process.
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 transfer pressure controls in grind grading process in the application by embodiment.
See Fig. 2, show the flow chart of method one embodiment that transfer pressure controls in grind grading process in the application.In the present embodiment, such as specifically can comprise the steps:
S201, detect grading plant at the transfer pressure of current time, as current pressure values.
Wherein, to the test example of transfer pressure as being every a fixing sampling period, just detect once, as a detection per second transfer pressure current pressure values and preserve.Be understandable that, in some embodiments, the mode of database can be adopted to preserve the force value that each moment detects.Particularly, can the force value used be needed to be kept in real-time data base current adjustment, and do not need the force value used to be kept in historical data base, also be, the force value detected in a nearest measurement period is hereinafter described kept at real-time data base, do not belong to the force value detected in a nearest measurement period and be kept at historical data base, only to need when carrying out current adjustment to obtain desired data from real-time data base.When the force value of transfer pressure being detected, first this force value can be kept in real-time data base, and after a measurement period, then this force value is moved in historical data base to preserve.
S202, the detected value that obtains before a nearest measurement period using transfer pressure, as in first force value, according to described current pressure values and described difference between first force value, calculate current pressure changing value.
Be understandable that, current pressure changing value is the variation tendency for embodying a nearest measurement period internal classification pressure, detect when it is and starts based on a nearest measurement period first concentration value with at the end of the difference of current pressure values that detects calculate.Wherein, the duration of a nearest measurement period can empirically pre-set, such as 5 seconds.
In some embodiments of the present embodiment, current pressure changing value can be the change representing transfer pressure force value size in a nearest measurement period, such as, current pressure changing value can equal current pressure values and the difference between first force value, that is, current pressure changing value can be calculated by following formula:
PI tend＝PI-PI last；
Wherein, PI tendrepresent current pressure changing value, PI represents current pressure values, PI lastrepresent in first force value.
In other embodiments of the present embodiment, current pressure changing value can be such as the speed of transfer pressure force value change in a nearest measurement period, such as, based on current pressure values and the difference between first force value, current pressure changing value can equal the business of this difference and a nearest measurement period duration, that is, current pressure changing value can be calculated by following formula:
PI tend = PI - PI last T ;
Wherein, PI tendrepresent current pressure changing value, PI represents current pressure values, PI lastrepresent in first force value, T represents the duration of a nearest measurement period.Be understandable that, PI tendcan select according to the needs calculated with the unit of T, such as, when " min " selects in the unit of T, PI tendunit can be " kpa/min ".
S203, analyze the number range belonging to described current pressure values and the number range belonging to described current pressure changing value.
In the present embodiment, to the analysis of number range belonging to current pressure values, be to determine whether current transfer pressure meets grading effect requirement.During specific implementation, a zone of reasonableness can be set for the size of transfer pressure, if the current pressure values of transfer pressure is in this zone of reasonableness, then can think that this current pressure values meets grading effect requirement, namely the grading plant of this current pressure values is in without the need to adjusting transfer pressure, if and the current pressure values of transfer pressure is not in this zone of reasonableness, then can think that this current pressure values does not meet grading effect requirement, the grading plant being namely in this current pressure values needs the direction of transfer pressure to this zone of reasonableness to adjust.Wherein, this zone of reasonableness can be delimited by reasonable upper pressure limit value and reasonable low pressure limit value, and described reasonable upper pressure limit value is greater than described reasonable low pressure limit value.Wherein, reasonable upper pressure limit value and reasonable low pressure limit value can be arranged according to knowhow.Such as, reasonable upper pressure limit value can be set to 120kpa, and reasonable low pressure limit value can be set to 80kpa.
In the present embodiment, to the analysis of number range belonging to current pressure changing value, be to determine current transfer pressure variation tendency.During specific implementation, the first change threshold being not more than 0 and the second change threshold being not less than 0 can be set respectively for the variation tendency of transfer pressure, when current pressure values is greater than reasonable upper pressure limit value, the magnitude relationship between current pressure changing value and the first change threshold can be compared, when current pressure is less than reasonable low pressure limit value, the magnitude relationship between current pressure changing value and the second change threshold can be compared.Wherein, if current pressure changing value is greater than 0, what then it embodied is the variation tendency that transfer pressure is in increase, and, when current pressure changing value is greater than 0, current pressure changing value is larger, shows that the increase tendency amplitude of transfer pressure is larger, and the speed that transfer pressure increases is faster; If current pressure changing value is less than 0, what then it embodied is the variation tendency that transfer pressure is in reduction, and, when current pressure changing value is less than 0, current pressure changing value is less, shows that the reduction trend of transfer pressure is larger, and the speed that transfer pressure reduces is faster.In addition, the first change threshold and the second change threshold can be arranged according to knowhow.Such as, the first change threshold can be set to 0 or-5kpa/min, and reasonable low pressure limit value can be set to 0 or 5kpa/min.
It should be noted that, in the present embodiment, the analysis result of number range belonging to number range and current pressure changing value belonging to current pressure values, can determine whether the variation tendency whether current classification pressure is in zone of reasonableness and current classification pressure can be enough to make transfer pressure remain on zone of reasonableness or offset to zone of reasonableness, thus select based on this regulative mode cyclone in grading plant being opened to quantity, also namely, select according to the analysis result of S203 the execution entering S204 ~ S207.
Be understandable that, in some embodiments of the present embodiment, in order to make the control of transfer pressure more accurate, more refinement can be carried out to the number range of current pressure values to divide, such as, with reasonable upper pressure limit value, reasonable low pressure limit value divides on the basis of the number range of current pressure values, the number range of current pressure values can also be divided further with high pressure cut off value and low-pressure interface value, this high pressure cut off value is greater than reasonable upper pressure limit value, low-pressure interface value is less than reasonable low pressure limit value, such as, be 120kpa and rationally low pressure limit value is on the basis of 80kpa in reasonable upper pressure limit value, high pressure cut off value can be set to 130kpa, low-pressure interface value can be set to 70kpa.Similarly, in order to make classification will from control more accurate, also can carry out more refinement to the number range of current pressure changing value to divide, such as, dividing on the basis of the number range of current pressure changing value with the first change threshold and the second change threshold, can also divide the number range of current pressure changing value further with the 3rd change threshold and the 4th change threshold, the 3rd change threshold is greater than 0, and the 4th change threshold is less than 0.Such as, the 3rd change threshold can be set to 5kpa/min, and the 4th change threshold can be set to-5kpa/min.
S204, be greater than reasonable upper pressure limit value in response to described current pressure values and described current pressure changing value is greater than the first change threshold, be increased to the first quantity with the current unlatching quantity of the first regulated quantity by cyclone in grading plant, to control the transfer pressure of described grading plant by the cyclone opening described first quantity.
Be understandable that, current pressure values is greater than reasonable upper pressure limit value and shows that current transfer pressure is too high, it is increase that current pressure changing value is greater than the reduction trend that the first change threshold shows that current classification pressure is in increase tendency or is in underswing, visible, too high but also its variation tendency of current not only transfer pressure shows that transfer pressure also the speed that reduces of more and more higher or transfer pressure can be crossed slow and be not enough to make transfer pressure be reduced to zone of reasonableness, now, the cyclone quantity of opening in grading plant can be increased, opening when quantity increases to make cyclone to make transfer pressure reduce.Wherein, the increase mode of quantity opened by cyclone, is, with the first regulated quantity, current unlatching quantity is increased to the first quantity.Such as, the first quantity can be current unlatching quantity and the first regulated quantity sum, and this first regulated quantity is greater than 0.
S205, be greater than reasonable upper pressure limit value in response to described current pressure values and described current pressure changing value is less than the first change threshold, keep the current unlatching quantity of cyclone in described grading plant constant, to control the transfer pressure of described grading plant by the cyclone opening described current unlatching quantity.
Be understandable that, current pressure values is greater than reasonable upper pressure limit value and shows that current transfer pressure is too high, current pressure changing value is less than the first change threshold and shows that current classification pressure is in the reduction trend of enough amplitudes, visible, although current transfer pressure is too high but its variation tendency shows that the speed that transfer pressure reduces is enough to make transfer pressure be reduced to zone of reasonableness enough soon, now, the current unlatching quantity of cyclone can be kept constant, when to make cyclone unlatching quantity constant, the transfer pressure of grading plant can be avoided excessively to reduce.
S206, be less than reasonable low pressure limit value in response to described current pressure values and described current pressure changing value is less than the second change threshold, with the second regulated quantity, the current unlatching quantity of cyclone in described grading plant is reduced to the second quantity, to control the transfer pressure of described grading plant by the cyclone opening described second quantity.
Be understandable that, current pressure values is less than reasonable low pressure limit value and shows that current transfer pressure is too low, current pressure changing value is less than the second change threshold and shows that current classification pressure is in reduction trend or is in the increase tendency of underswing, visible, too low but also its variation tendency of current not only transfer pressure shows that transfer pressure also the speed that increases of more and more lower or transfer pressure can be crossed slow and be not enough to time stage pressure increase to zone of reasonableness, now, the cyclone quantity of opening in grading plant can be reduced, opening when quantity reduces to make cyclone to make transfer pressure increase.Wherein, the minimizing mode of quantity opened by cyclone, is, with the second regulated quantity, current unlatching quantity is decreased to the second quantity.Such as, the second quantity can be current unlatching quantity and the second regulated quantity sum, and this second regulated quantity is less than 0.
S207, be less than reasonable low pressure limit value in response to described current pressure values and described current pressure changing value is greater than the second change threshold, keep the current unlatching quantity of cyclone in described grading plant constant, to control the transfer pressure of described grading plant by the cyclone opening described current unlatching quantity.
Be understandable that, current pressure values is less than reasonable low pressure limit value and shows that current transfer pressure is too low, current pressure changing value is greater than the second change threshold and shows that current classification pressure is in the increase tendency of enough amplitudes, visible, although current transfer pressure is too low but its variation tendency shows that the speed that transfer pressure increases is enough to make transfer pressure increase to zone of reasonableness enough soon, now, the current unlatching quantity of cyclone can be kept constant, when to make cyclone unlatching quantity constant, the transfer pressure of grading plant can be avoided excessively to increase.
It should be noted that, too high and be in the situation of the reduction trend of increase tendency or underswing for transfer pressure, the increase tendency of transfer pressure is different, the unlatching quantity of cyclone is increased according to the first identical regulated quantity, often just make the adjustment of transfer pressure excessive or not enough, similarly, too low and be in the situation of the increase tendency of reduction trend or underswing for transfer pressure, the reduction trend of transfer pressure is also different, the unlatching quantity of cyclone is reduced according to the second identical regulated quantity, often just make classification will from adjustment excessive or not enough.In order to avoid this transfer pressure adjust excessive and not enough, make the control of transfer pressure more accurate, in some embodiments of the present embodiment, described first regulated quantity and described second regulated quantity can be all such as change datum quantity to determine according to current cyclone, wherein, described current cyclone changes datum quantity and determines according to described current pressure variable quantity, the first regulated quantity varied in size so just can be adopted to make the current unlatching quantity of cyclone reduce different amplitudes when transfer pressure increase tendency is in different amplitude, also can reduce to adopt the second regulated quantity varied in size to make the current unlatching quantity of cyclone increase different amplitudes when trend is in different amplitude at transfer pressure, to make the control of transfer pressure more accurate.Particularly, the first regulated quantity and the second regulated quantity such as can be calculated by following formula:
OP = MOD ( PI tend K ) ;
Wherein, OP is that current cyclone changes datum quantity, PI tendfor current pressure variable quantity, MOD represents and rounds algorithm, and K is preset constant, and such as, K can be 20kpa/min.
Be understandable that, too high and be in the situation of the reduction trend of increase tendency or underswing for transfer pressure, transfer pressure is different higher than the amplitude of zone of reasonableness, increase the unlatching quantity of cyclone according to the first identical regulated quantity, often just make the adjustment of transfer pressure excessive or not enough.In order to avoid this transfer pressure adjust excessive and not enough, make the control of transfer pressure more accurate, in some embodiments of the present embodiment, too high and be in the situation of the reduction trend of increase tendency or underswing for transfer pressure, the first regulated quantity varied in size can be adopted to make the current unlatching quantity of cyclone increase different amplitudes when transfer pressure amplitude different from zone of reasonableness, increase more to make when transfer pressure is higher, cyclone being opened quantity, thus the follow-up reduction that can have by a larger margin of transfer pressure.Specifically, when described current pressure values is greater than high pressure cut off value, described first regulated quantity specifically can be chosen as the first high-amplitude regulated quantity; When described current pressure values is less than high pressure cut off value and is greater than described reasonable upper pressure limit value, described first regulated quantity specifically can be chosen as the first regulated quantity by a narrow margin; Wherein, described high pressure cut off value is greater than described reasonable upper pressure limit value, and the amplitude of accommodation of described first high-amplitude regulated quantity to described current unlatching quantity is greater than the amplitude of accommodation of described second high-amplitude regulated quantity to described current unlatching quantity.Such as, aforementioned with current cyclone change datum quantity determine on the embodiment basis of the first regulated quantity, the first high-amplitude regulated quantity such as can be set to OP+1, described second by a narrow margin regulated quantity can be set to OP.
Similarly, too low and be in the situation of the increase tendency of reduction trend or underswing for transfer pressure, transfer pressure is different lower than the amplitude of zone of reasonableness, reduces the unlatching quantity of cyclone, often just make the adjustment of transfer pressure excessive or not enough according to the second identical regulated quantity.In order to avoid this transfer pressure adjust excessive and not enough, make the control of transfer pressure more accurate, in some embodiments of the present embodiment, too low and be in the situation of the increase tendency of reduction trend or underswing for transfer pressure, the second regulated quantity varied in size can be adopted to make the current unlatching quantity of cyclone reduce different amplitudes when transfer pressure amplitude different from zone of reasonableness, reduce more to make when transfer pressure is lower, cyclone being opened quantity, thus the follow-up increase that can have by a larger margin of transfer pressure.Specifically, when described current pressure values is less than low-pressure interface value, described second regulated quantity is specifically as follows the second high-amplitude regulated quantity; When described current pressure values is greater than low-pressure interface value and is less than described reasonable low pressure limit value, described second regulated quantity is specifically as follows the second regulated quantity by a narrow margin; Wherein, described low-pressure interface value is less than described reasonable low pressure limit value, the amplitude of accommodation of described second high-amplitude regulated quantity to described current unlatching quantity be greater than described second by a narrow margin regulated quantity to the amplitude of accommodation of described current unlatching quantity.Such as, aforementioned with current cyclone change datum quantity determine on the embodiment basis of the second regulated quantity, the second high-amplitude regulated quantity such as can be set to OP-1, described second by a narrow margin regulated quantity can be set to OP.
It should be noted that, transfer pressure is different higher than the amplitude of zone of reasonableness, the reduction trend being enough to make transfer pressure be reduced to zone of reasonableness is different, judge whether variation tendency is enough to make transfer pressure be adjusted to zone of reasonableness according to the first identical change threshold, often just make the reduction of transfer pressure excessive or not enough.In order to avoid this transfer pressure reduce excessive and not enough, make the control of transfer pressure more accurate, in some embodiments of the present embodiment, too high and be in the situation of the reduction trend of increase tendency or underswing for transfer pressure, the first change threshold varied in size can be adopted to determine whether to increase the unlatching quantity of cyclone when transfer pressure amplitude different from zone of reasonableness, just can be increased when transfer pressure is in the reduction trend of more low amplitude to make the unlatching quantity of the cyclone when transfer pressure is higher, transfer pressure can reduce faster when so just can be made higher.Specifically, when described current pressure values is greater than high pressure cut off value, described first change threshold such as can be specially the first high-amplitude change threshold; When described current pressure values is less than high pressure cut off value and is greater than described reasonable upper pressure limit value, described first change threshold is such as specifically as follows the first change threshold by a narrow margin; Wherein, described high pressure cut off value is greater than described reasonable upper pressure limit value, and described first high-amplitude change threshold is less than the described first change threshold by a narrow margin.Such as, the first high-amplitude change threshold can be set to-20kpa/min, described first by a narrow margin change threshold can be set to 0.
Similarly, transfer pressure is different lower than the amplitude of zone of reasonableness, the increase tendency being enough to make transfer pressure increase to zone of reasonableness is different, judge whether variation tendency is enough to make transfer pressure be adjusted to zone of reasonableness according to the second identical change threshold, often just make the increase of transfer pressure excessive or not enough.In order to avoid this transfer pressure increase excessive and not enough, make the control of transfer pressure more accurate, in some embodiments of the present embodiment, too low and be in the situation of the increase tendency of reduction trend or underswing for transfer pressure, the second change threshold varied in size can be adopted to determine whether to reduce the unlatching quantity of cyclone when transfer pressure amplitude different from zone of reasonableness, just can be reduced when transfer pressure is in the increase tendency of more low amplitude to make the unlatching quantity of the cyclone when transfer pressure is lower, transfer pressure can increase faster when so just can be made lower.Specifically, when described current pressure values is less than low-pressure interface value, described second change threshold is such as specifically as follows the second high-amplitude change threshold; When described current pressure values is greater than low-pressure interface value and is less than described reasonable low pressure limit value, described second change threshold is such as specifically as follows the second change threshold by a narrow margin; Wherein, described low-pressure interface value is less than described reasonable low pressure limit value, and described second high-amplitude change threshold is greater than the described second change threshold by a narrow margin.Such as, the second high-amplitude change threshold can be set to 20kpa/min, described second by a narrow margin change threshold can be set to 0.
Sometimes in actual production, although current pressure values is in zone of reasonableness, the variation tendency amplitude that current pressure values embodies is comparatively large, and now, although current transfer pressure has been in zone of reasonableness, it will exceed zone of reasonableness subsequently.In order to avoid transfer pressure exceeds zone of reasonableness subsequently in this case, in some embodiments of the present embodiment, zone of reasonableness is in for transfer pressure but the larger situation of variation tendency amplitude, can determine that the current unlatching quantity of cyclone will remain unchanged, increases or reduce according to the variation tendency of transfer pressure, to make the unlatching quantity suitably regulating cyclone when transfer pressure was in significantly variation tendency, thus transfer pressure is follow-up can keep in the reasonable scope.Particularly, as shown in Figure 3, in the present embodiment, according to the analysis result of S203, except selecting to enter except S204 ~ S207 execution, such as, can also select to enter S301 ~ S303 and perform:
S301, be less than reasonable upper pressure limit value in response to described current pressure values and be greater than reasonable low pressure limit value and described current pressure changing value is greater than the 3rd change threshold, with the 3rd regulated quantity, the current unlatching quantity of cyclone in described grading plant is increased to the 3rd quantity, to control the transfer pressure of described grading plant by the cyclone opening described 3rd quantity.
In the present embodiment, dividing on the basis of the number range of current pressure changing value with the first change threshold and the second change threshold, the number range of current pressure changing value can also be divided further with the 3rd change threshold and the 4th change threshold, 3rd change threshold is greater than 0, and the 4th change threshold is less than 0.Such as, the 3rd change threshold can be set to 5kpa/min, and the 4th change threshold can be set to-5kpa/min.
Be understandable that, current pressure values is in reasonable upper pressure limit value and rationally shows that current transfer pressure is in zone of reasonableness between low pressure limit value, current pressure changing value is greater than the 3rd change threshold and the 3rd change threshold is greater than 0 shows that the increase tendency amplitude of current classification pressure is excessive, visible, although current transfer pressure is in zone of reasonableness and its variation tendency shows that transfer pressure subsequently can be too high, now, the cyclone quantity of opening in grading plant can be increased, opening when quantity increases to make cyclone to make the transfer pressure of grading plant also keep in the reasonable scope subsequently.Wherein, the increase mode of quantity opened by cyclone, is, with the 3rd regulated quantity, current unlatching quantity is increased to the 3rd quantity.Such as, the 3rd quantity can be current unlatching quantity and the 3rd regulated quantity sum, and the 5th regulated quantity is greater than 0.In addition, change according to current cyclone the embodiment that datum quantity determines the first regulated quantity and the second regulated quantity with reference to aforementioned, 3rd regulated quantity also can be such as change datum quantity according to aforementioned current cyclone to determine, particularly, the 3rd regulated quantity such as can be set to OP.
S302, be less than reasonable upper pressure limit value in response to described current pressure values and be greater than reasonable low pressure limit value and described current pressure changing value is less than the 3rd change threshold and is greater than the 4th change threshold, keep the current unlatching quantity of cyclone in described grading plant constant, to control the transfer pressure of described grading plant by the cyclone opening described current unlatching quantity.
Be understandable that, current pressure values is in reasonable upper pressure limit value and rationally shows that current transfer pressure is in zone of reasonableness between low pressure limit value, current pressure changing value is between the 3rd change threshold and the 4th change threshold and the 3rd change threshold is greater than 0, 4th change threshold is less than 0 and shows that the variation tendency of current classification pressure is suitable, visible, current not only transfer pressure is in zone of reasonableness but also its variation tendency shows that transfer pressure fluctuation is subsequently also little, now, the current unlatching quantity of cyclone can be made to remain unchanged, the transfer pressure of grading plant can be made also to keep in the reasonable scope subsequently when to make cyclone unlatching quantity constant.
S303, be less than reasonable upper pressure limit value in response to described current pressure values and be greater than reasonable low pressure limit value and described current pressure changing value is less than the 4th change threshold, with the 4th regulated quantity, the current unlatching quantity of cyclone in described grading plant is reduced to the 4th quantity, to control the transfer pressure of described grading plant by the cyclone opening described 4th quantity.
Be understandable that, current pressure values is in reasonable upper pressure limit value and rationally shows that current transfer pressure is in zone of reasonableness between low pressure limit value, current pressure changing value is less than the 4th change threshold and the 4th change threshold is less than 0 shows that the reduction trend amplitude of current classification pressure is excessive, visible, although current transfer pressure is in zone of reasonableness and its variation tendency shows that transfer pressure subsequently can be too low, now, the cyclone quantity of opening in grading plant can be reduced, opening when quantity reduces to make cyclone to make the transfer pressure of grading plant also keep in the reasonable scope subsequently.Wherein, the minimizing mode of quantity opened by cyclone, is, with the 4th regulated quantity, current unlatching quantity is reduced to the 4th quantity.In addition, change according to current cyclone the embodiment that datum quantity determines the first regulated quantity and the second regulated quantity with reference to aforementioned, 4th regulated quantity also can be such as change datum quantity according to aforementioned current cyclone to determine, particularly, the 4th regulated quantity such as can be set to OP.
Then Fig. 2 is returned.
It should be noted that, if all regulated the current unlatching quantity of cyclone after the current pressure values of current time at every turn detecting and preserve transfer pressure, the adjustment of cyclone unlatching quantity will be made too frequent, this not only causes larger overhead, and transfer pressure can be made under the frequent adjustment of quantity opened by cyclone to produce larger fluctuation.Therefore, in some embodiments of the present embodiment, the constraint cycle of being longer than sense cycle can also be set, for each current time detecting transfer pressure, the time that only once ore slurry pump frequency changes in current time distance goes when reaching more than the constraint cycle to determine that the regulative mode of cyclone unlatching quantity also regulates the unlatching quantity of cyclone accordingly again, cyclone so just can be avoided to open quantity regulating too frequently, thus not only can reduce overhead but also transfer pressure can be made more stable.Particularly, the present embodiment such as can also comprise: judge whether moment institute's elapsed time that described current time changes apart from the unlatching quantity of cyclone in last described grading plant reaches the constraint cycle more than, if so, then execution S203 and subsequent step is entered.Wherein, the constraint cycle such as can be set to 100 seconds.
Be understandable that, when introducing the embodiment of the present embodiment, involved design parameter setting value is all exemplary, and in the present embodiment, the setting value of each parameter can adopt and include but not limited to above cited numerical value.
By the technical scheme of the present embodiment, on the one hand, transfer pressure in grading plant can be controlled by the adjustment of cyclone unlatching quantity in grading plant, transfer pressure is controlled with respect to adjustment ore slurry pump, control directly by regulating grading plant to realize transfer pressure has less time delay, on the other hand, cyclone opens the regulative mode of quantity simultaneously according to the current pressure values of transfer pressure and the change value of pressure in nearest a period of time, and when current pressure values departs from zone of reasonableness, if what change value of pressure embodied is be not enough to make transfer pressure be changed to the pressure trend of zone of reasonableness, cyclone is regulated to open quantity according to current pressure values relative to the skew of zone of reasonableness, if what change value of pressure embodied is be enough to make transfer pressure be changed to the pressure trend of zone of reasonableness, cyclone is no longer regulated to open quantity, therefore, when transfer pressure does not also adjust complete for this frequency adjustment, even if current pressure values does not also adjust to zone of reasonableness, change value of pressure also can embody to be enough to make transfer pressure be changed to the pressure trend of zone of reasonableness, the unlatching quantity of cyclone now just can be kept constant, thus avoid the excessive adjustment of transfer pressure, transfer pressure is made to keep stable, thus improve the grading effect of grind grading process.
In order to the application mode of technical scheme in actual scene making those skilled in the art clearly understand the application, for an application scenarios, a kind of embodiment of the application in practical application will be introduced in detail below.But it should be noted that the embodiment of this application scenarios is only spirit for the ease of understanding the application and principle and illustrates, the embodiment of the application is unrestricted in this regard.On the contrary, the embodiment of the application can be applied to applicable any scene.
See Fig. 4, show the flow chart of another embodiment of method that transfer pressure controls in grinding process in the application.In the present embodiment, can comprise the following steps:
S401, detect grading plant at the transfer pressure of current time, as current pressure values.
In the present embodiment, main detected parameters and controling parameters can be preserved, can check when overhauling equipment later.The parameter of preserving, such as, can comprise the current pressure values etc. that each moment detects transfer pressure, and the quantity that each parameter is preserved can be all data in a nearest preset time period, such as, supplemental characteristic in nearest 3 months.
S402, the detected value that obtains before a nearest measurement period using transfer pressure, as in first force value, according to current pressure values and the difference between first force value, calculate current pressure changing value.
Particularly, the duration of measurement period can select 5 seconds, then current pressure changing value can be calculated by following formula:
PI tend = ( PI - PI last ) × 60 T ;
Wherein, PI tendrepresent current pressure changing value, PI represents current pressure values, PI lastrepresent in first force value, T represents the duration of a nearest measurement period, i.e. T=5.Be understandable that, PI tendunit be " kpa/min ".
S403, judge whether moment institute's elapsed time that described current time changes apart from the unlatching quantity of last cyclone reaches the constraint cycle more than; If so, S404 is entered; If not, S401 is returned.
Wherein, the duration retraining the cycle can be set to 100 seconds.
Be understandable that, when once the moment of change of frequency does not reach the constraint cycle in current time distance, return when can wait for the next detection moment and perform S401, enter the next adjustment detecting the moment.
S404, the number range belonging to current pressure values and the number range belonging to current pressure changing value, determine that the regulative mode of quantity opened by cyclone, and calculate the unlatching of the cyclone after regulating quantity.
In the present embodiment, the upper pressure limit of equipment can be 180kpa, and high pressure cut off value can be 130kpa, reasonable upper pressure limit value can be 120kpa, reasonable low pressure limit value can be 80kpa, and low-pressure interface value can be 70kpa, and the low pressure limit of equipment can be 0kpa; First change threshold can comprise the first high-amplitude change threshold and first change threshold by a narrow margin, second change threshold can comprise the second high-amplitude change threshold and second change threshold by a narrow margin, wherein, first high-amplitude change threshold can be-20kpa/min, first change threshold can be the 0, second high-amplitude change threshold by a narrow margin can be 20kpa/min, second by a narrow margin change threshold can be 0,3rd change threshold can be 5kpa/min, and the 4th change threshold can be-5kpa/min; First regulated quantity can comprise the first high-amplitude regulated quantity and first regulated quantity by a narrow margin, second regulated quantity can comprise the second high-amplitude regulated quantity and second regulated quantity by a narrow margin, wherein, first high-amplitude regulated quantity can be OP+1, first by a narrow margin regulated quantity can be OP, second high-amplitude regulated quantity can be OP-1, second by a narrow margin regulated quantity can be OP, 3rd regulated quantity and the 4th regulated quantity can be OP, wherein, OP represents that current cyclone changes datum quantity, and its formula that can refer in previous embodiment calculates.On the basis of above setting parameter, the regulative mode of ore slurry pump frequency can be determined according to table 1:
Table 1
Sequence number PI place number range PI tendThe number range at place Frequency adjustment mode
1 130＜PI≤180 PI tend≥-20 NUM＝NUM+1+OP
2 130＜PI≤180 PI tend＜-20 NUM＝NUM
3 120＜PI≤130 PI tend≥0 NUM＝NUM+OP
4 120＜PI≤130 PItend＜0 NUM＝NUM
5 80≤PI≤120 PI tend≥5 NUM＝NUM+OP
6 80≤PI≤120 -5≤PI tend＜5 NUM＝NUM
7 80≤PI≤120 PI tend＜-5 NUM＝NUM+OP
8 70≤PI＜80 PI tend≤0 NUM＝NUM-1+OP
9 70≤PI＜80 PI tend＞0 NUM＝NUM
10 0≤PI＜70 PI tend≤20 NUM＝NUM+OP
11 0≤PI＜70 PI tend＞20 NUM＝NUM
In Table 1, PI represents current pressure values, PI tendrepresent current pressure changing value, NUM represents the unlatching quantity of cyclone.It should be noted that, in table 1, cyclone is opened on basis that the regulative mode of quantity is the embodiment introduced in preceding method embodiment 1 and is determined, but it is easy and clear in order to what describe in the present embodiment, state in a tabular form, therefore the determination mode in table 1 is the basic thought meeting the application introduced in previous embodiment.
S405, run cyclone, to control the transfer pressure of grading plant with the unlatching quantity after regulating.
By the technical scheme of the present embodiment, transfer pressure in grading plant can be controlled by the adjustment of cyclone unlatching quantity in grading plant, and ore slurry pump frequency cyclone opens the regulative mode of quantity simultaneously according to the current pressure values of transfer pressure and the change value of pressure in nearest a period of time, therefore, when transfer pressure does not also adjust complete for this frequency adjustment, even if current pressure values does not also adjust to zone of reasonableness, change value of pressure also can embody to be enough to make transfer pressure be changed to the pressure trend of zone of reasonableness, now just can refuse again to carry out regulating frequency according to current pressure values relative to the skew of zone of reasonableness, thus avoid the excessive adjustment of transfer pressure, transfer pressure is made to keep stable, thus improve the grading effect of grind grading process.
Corresponding to embodiment of the method, present invention also provides the device that in a kind of grind grading process, transfer pressure controls.
See Fig. 5, show the structure chart of device one embodiment that transfer pressure controls in grind grading process in the application.In the present embodiment, described device such as specifically can comprise:
Detection module 501, for detecting the transfer pressure of grading plant at current time, as current pressure values;
Computing module 502, for the detected value that obtains before a nearest measurement period using transfer pressure as in first force value, according to described current pressure values and described difference between first force value, calculates current pressure changing value;
Analysis module 503, for analyzing the number range belonging to described current pressure values and the number range belonging to described current pressure changing value;
First increases module 504, for being greater than reasonable upper pressure limit value in response to described current pressure values and described current pressure changing value is greater than the first change threshold, with the first regulated quantity, the current unlatching quantity of cyclone in grading plant is increased to the first quantity, to control the transfer pressure of described grading plant by the cyclone opening described first quantity;
First keeps module 505, for being greater than reasonable upper pressure limit value in response to described current pressure values and described current pressure changing value is less than the first change threshold, keep the current unlatching quantity of cyclone in described grading plant constant, to control the transfer pressure of described grading plant by the cyclone opening described current unlatching quantity;
First reduces module 506, for being less than reasonable low pressure limit value in response to described current pressure values and described current pressure changing value is less than the second change threshold, with the second regulated quantity, the current unlatching quantity of cyclone in described grading plant is reduced to the second quantity, to control the transfer pressure of described grading plant by the cyclone opening described second quantity;
Second keeps module 507, for being less than reasonable low pressure limit value in response to described current pressure values and described current pressure changing value is greater than the second change threshold, keep the current unlatching quantity of cyclone in described grading plant constant, to control the transfer pressure of described grading plant by the cyclone opening described current unlatching quantity;
Wherein, described reasonable upper pressure limit value is greater than described reasonable low pressure limit value, and described first change threshold is not more than 0, and described second change threshold is not less than 0.
In the first possible embodiment of the present embodiment:
When described current pressure values is greater than high pressure cut off value, described first regulated quantity is such as specifically as follows the first high-amplitude regulated quantity; When described current pressure values is less than high pressure cut off value and is greater than described reasonable upper pressure limit value, described first regulated quantity is such as specifically as follows the first regulated quantity by a narrow margin; Wherein, described high pressure cut off value is greater than described reasonable upper pressure limit value, the amplitude of accommodation of described first high-amplitude regulated quantity to described current unlatching quantity be greater than described first by a narrow margin regulated quantity to the amplitude of accommodation of described current unlatching quantity;
When described current pressure values is less than low-pressure interface value, described second regulated quantity is such as specifically as follows the second high-amplitude regulated quantity; When described current pressure values is greater than low-pressure interface value and is less than described reasonable low pressure limit value, described second regulated quantity is such as specifically as follows the second regulated quantity by a narrow margin; Wherein, described low-pressure interface value is less than described reasonable low pressure limit value, the amplitude of accommodation of described second high-amplitude regulated quantity to described current unlatching quantity be greater than described second by a narrow margin regulated quantity to the amplitude of accommodation of described current unlatching quantity.
In the embodiment that the present embodiment the second is possible:
When described current pressure values is greater than high pressure cut off value, described first change threshold is such as specifically as follows the first high-amplitude change threshold; When described current pressure values is less than high pressure cut off value and is greater than described reasonable upper pressure limit value, described first change threshold is such as specifically as follows the first change threshold by a narrow margin; Wherein, described high pressure cut off value is greater than described reasonable upper pressure limit value, and described first high-amplitude change threshold is less than the described first change threshold by a narrow margin;
When described current pressure values is less than low-pressure interface value, described second change threshold is such as specifically as follows the second high-amplitude change threshold; When described current pressure values is greater than low-pressure interface value and is less than described reasonable low pressure limit value, described second change threshold is such as specifically as follows the second change threshold by a narrow margin; Wherein, described low-pressure interface value is less than described reasonable low pressure limit value, and described second high-amplitude change threshold is greater than the described second change threshold by a narrow margin.
In the third possible embodiment of the present embodiment, described first regulated quantity and described second regulated quantity such as all can change datum quantity to determine according to cyclone, wherein, described cyclone change datum quantity such as can be determined according to described current pressure variable quantity.
In the present embodiment the 4th kind of possible embodiment, described device such as can also comprise:
Second increases module, for being less than reasonable upper pressure limit value in response to described current pressure values and being greater than reasonable low pressure limit value and described current pressure changing value is greater than the 3rd change threshold, with the 3rd regulated quantity, the current unlatching quantity of cyclone in described grading plant is increased to the 3rd quantity, to control the transfer pressure of described grading plant by the cyclone opening described 3rd quantity;
3rd keeps module, for being less than reasonable upper pressure limit value in response to described current pressure values and being greater than reasonable low pressure limit value and described current pressure changing value is less than the 3rd change threshold and is greater than the 4th change threshold, keep the current unlatching quantity of cyclone in described grading plant constant, to control the transfer pressure of described grading plant by the cyclone opening described current unlatching quantity;
Second reduces module, for being less than reasonable upper pressure limit value in response to described current pressure values and being greater than reasonable low pressure limit value and described current pressure changing value is less than the 4th change threshold, with the 4th regulated quantity, the current unlatching quantity of cyclone in described grading plant is reduced to the 4th quantity, to control the transfer pressure of described grading plant by the cyclone opening described 4th quantity;
Wherein, described 3rd change threshold is greater than 0, and described 4th change threshold is less than 0.
In the present embodiment the 5th kind of possible embodiment, described device such as can also comprise:
Judge module, for judging whether moment institute's elapsed time that described current time changes apart from the unlatching quantity of cyclone in last described grading plant reaches the constraint cycle more than;
Trigger module, for when the judged result of described judge module is for being, triggers described analysis module.
By the technical scheme of the present embodiment, on the one hand, transfer pressure in grading plant can be controlled by the adjustment of cyclone unlatching quantity in grading plant, transfer pressure is controlled with respect to adjustment ore slurry pump, control directly by regulating grading plant to realize transfer pressure has less time delay, on the other hand, cyclone opens the regulative mode of quantity simultaneously according to the current pressure values of transfer pressure and the change value of pressure in nearest a period of time, and when current pressure values departs from zone of reasonableness, if what change value of pressure embodied is be not enough to make transfer pressure be changed to the pressure trend of zone of reasonableness, cyclone is regulated to open quantity according to current pressure values relative to the skew of zone of reasonableness, if what change value of pressure embodied is be enough to make transfer pressure be changed to the pressure trend of zone of reasonableness, cyclone is no longer regulated to open quantity, therefore, when transfer pressure does not also adjust complete for this frequency adjustment, even if current pressure values does not also adjust to zone of reasonableness, change value of pressure also can embody to be enough to make transfer pressure be changed to the pressure trend of zone of reasonableness change, the unlatching quantity of cyclone now just can be kept constant, thus avoid the excessive adjustment of transfer pressure, transfer pressure is made to keep stable, thus improve the grading effect of grind grading process.
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 (12)

1. the method that in grind grading process, transfer pressure controls, is characterized in that, comprising:
Detect the transfer pressure of grading plant at current time, as current pressure values;
The detected value obtained before a nearest measurement period using transfer pressure, as in first force value, according to described current pressure values and described difference between first force value, calculates current pressure changing value;
Analyze the number range belonging to described current pressure values and the number range belonging to described current pressure changing value;
Reasonable upper pressure limit value is greater than and described current pressure changing value is greater than the first change threshold in response to described current pressure values, be increased to the first quantity with the current unlatching quantity of the first regulated quantity by cyclone in grading plant, to control the transfer pressure of described grading plant by the cyclone opening described first quantity;
Reasonable upper pressure limit value is greater than and described current pressure changing value is less than the first change threshold in response to described current pressure values, keep the current unlatching quantity of cyclone in described grading plant constant, to control the transfer pressure of described grading plant by the cyclone opening described current unlatching quantity;
Reasonable low pressure limit value is less than and described current pressure changing value is less than the second change threshold in response to described current pressure values, with the second regulated quantity, the current unlatching quantity of cyclone in described grading plant is reduced to the second quantity, to control the transfer pressure of described grading plant by the cyclone opening described second quantity;
Reasonable low pressure limit value is less than and described current pressure changing value is greater than the second change threshold in response to described current pressure values, keep the current unlatching quantity of cyclone in described grading plant constant, to control the transfer pressure of described grading plant by the cyclone opening described current unlatching quantity;
Wherein, described reasonable upper pressure limit value is greater than described reasonable low pressure limit value, and described first change threshold is not more than 0, and described second change threshold is not less than 0.
2. method according to claim 1, is characterized in that,
When described current pressure values is greater than high pressure cut off value, described first regulated quantity is specially the first high-amplitude regulated quantity; When described current pressure values is less than high pressure cut off value and is greater than described reasonable upper pressure limit value, described first regulated quantity is specially the first regulated quantity by a narrow margin; Wherein, described high pressure cut off value is greater than described reasonable upper pressure limit value, the amplitude of accommodation of described first high-amplitude regulated quantity to described current unlatching quantity be greater than described first by a narrow margin regulated quantity to the amplitude of accommodation of described current unlatching quantity;
When described current pressure values is less than low-pressure interface value, described second regulated quantity is specially the second high-amplitude regulated quantity; When described current pressure values is greater than low-pressure interface value and is less than described reasonable low pressure limit value, described second regulated quantity is specially the second regulated quantity by a narrow margin; Wherein, described low-pressure interface value is less than described reasonable low pressure limit value, the amplitude of accommodation of described second high-amplitude regulated quantity to described current unlatching quantity be greater than described second by a narrow margin regulated quantity to the amplitude of accommodation of described current unlatching quantity.
3. method according to claim 1, is characterized in that,
When described current pressure values is greater than high pressure cut off value, described first change threshold is specially the first high-amplitude change threshold; When described current pressure values is less than high pressure cut off value and is greater than described reasonable upper pressure limit value, described first change threshold is specially the first change threshold by a narrow margin; Wherein, described high pressure cut off value is greater than described reasonable upper pressure limit value, and described first high-amplitude change threshold is less than the described first change threshold by a narrow margin;
When described current pressure values is less than low-pressure interface value, described second change threshold is specially the second high-amplitude change threshold; When described current pressure values is greater than low-pressure interface value and is less than described reasonable low pressure limit value, described second change threshold is specially the second change threshold by a narrow margin; Wherein, described low-pressure interface value is less than described reasonable low pressure limit value, and described second high-amplitude change threshold is greater than the described second change threshold by a narrow margin.
4. method according to claim 1, it is characterized in that, described first regulated quantity and described second regulated quantity are all change datum quantity to determine according to current cyclone, and wherein, described current cyclone changes datum quantity and determines according to described current pressure variable quantity.
5. method according to claim 1, is characterized in that, also comprises:
Be less than reasonable upper pressure limit value in response to described current pressure values and be greater than reasonable low pressure limit value and described current pressure changing value is greater than the 3rd change threshold, with the 3rd regulated quantity, the current unlatching quantity of cyclone in described grading plant is increased to the 3rd quantity, to control the transfer pressure of described grading plant by the cyclone opening described 3rd quantity;
Be less than reasonable upper pressure limit value in response to described current pressure values and be greater than reasonable low pressure limit value and described current pressure changing value is less than the 3rd change threshold and is greater than the 4th change threshold, keep the current unlatching quantity of cyclone in described grading plant constant, to control the transfer pressure of described grading plant by the cyclone opening described current unlatching quantity;
Be less than reasonable upper pressure limit value in response to described current pressure values and be greater than reasonable low pressure limit value and described current pressure changing value is less than the 4th change threshold, with the 4th regulated quantity, the current unlatching quantity of cyclone in described grading plant is reduced to the 4th quantity, to control the transfer pressure of described grading plant by the cyclone opening described 4th quantity;
Wherein, described 3rd change threshold is greater than 0, and described 4th change threshold is less than 0.
6. method according to claim 1, is characterized in that, also comprises:
Judge whether moment institute's elapsed time that described current time changes apart from the unlatching quantity of cyclone in last described grading plant reaches the constraint cycle more than, if so, the number range belonging to the described current pressure values of the described analysis of execution and the number range belonging to described current pressure changing value is entered.
7. the device that in grind grading process, transfer pressure controls, is characterized in that, comprising:
Detection module, for detecting the transfer pressure of grading plant at current time, as current pressure values;
Computing module, for the detected value that obtains before a nearest measurement period using transfer pressure as in first force value, according to described current pressure values and described difference between first force value, calculates current pressure changing value;
Analysis module, for analyzing the number range belonging to described current pressure values and the number range belonging to described current pressure changing value;
First increases module, for being greater than reasonable upper pressure limit value in response to described current pressure values and described current pressure changing value is greater than the first change threshold, with the first regulated quantity, the current unlatching quantity of cyclone in grading plant is increased to the first quantity, to control the transfer pressure of described grading plant by the cyclone opening described first quantity;
First keeps module, for being greater than reasonable upper pressure limit value in response to described current pressure values and described current pressure changing value is less than the first change threshold, keep the current unlatching quantity of cyclone in described grading plant constant, to control the transfer pressure of described grading plant by the cyclone opening described current unlatching quantity;
First reduces module, for being less than reasonable low pressure limit value in response to described current pressure values and described current pressure changing value is less than the second change threshold, with the second regulated quantity, the current unlatching quantity of cyclone in described grading plant is reduced to the second quantity, to control the transfer pressure of described grading plant by the cyclone opening described second quantity;
Second keeps module, for being less than reasonable low pressure limit value in response to described current pressure values and described current pressure changing value is greater than the second change threshold, keep the current unlatching quantity of cyclone in described grading plant constant, to control the transfer pressure of described grading plant by the cyclone opening described current unlatching quantity;
Wherein, described reasonable upper pressure limit value is greater than described reasonable low pressure limit value, and described first change threshold is not more than 0, and described second change threshold is not less than 0.
8. device according to claim 7, is characterized in that,
When described current pressure values is greater than high pressure cut off value, described first regulated quantity is specially the first high-amplitude regulated quantity; When described current pressure values is less than high pressure cut off value and is greater than described reasonable upper pressure limit value, described first regulated quantity is specially the first regulated quantity by a narrow margin; Wherein, described high pressure cut off value is greater than described reasonable upper pressure limit value, the amplitude of accommodation of described first high-amplitude regulated quantity to described current unlatching quantity be greater than described first by a narrow margin regulated quantity to the amplitude of accommodation of described current unlatching quantity;
When described current pressure values is less than low-pressure interface value, described second regulated quantity is specially the second high-amplitude regulated quantity; When described current pressure values is greater than low-pressure interface value and is less than described reasonable low pressure limit value, described second regulated quantity is specially the second regulated quantity by a narrow margin; Wherein, described low-pressure interface value is less than described reasonable low pressure limit value, the amplitude of accommodation of described second high-amplitude regulated quantity to described current unlatching quantity be greater than described second by a narrow margin regulated quantity to the amplitude of accommodation of described current unlatching quantity.
9. device according to claim 7, is characterized in that,
When described current pressure values is greater than high pressure cut off value, described first change threshold is specially the first high-amplitude change threshold; When described current pressure values is less than high pressure cut off value and is greater than described reasonable upper pressure limit value, described first change threshold is specially the first change threshold by a narrow margin; Wherein, described high pressure cut off value is greater than described reasonable upper pressure limit value, and described first high-amplitude change threshold is less than the described first change threshold by a narrow margin;
When described current pressure values is less than low-pressure interface value, described second change threshold is specially the second high-amplitude change threshold; When described current pressure values is greater than low-pressure interface value and is less than described reasonable low pressure limit value, described second change threshold is specially the second change threshold by a narrow margin; Wherein, described low-pressure interface value is less than described reasonable low pressure limit value, and described second high-amplitude change threshold is greater than the described second change threshold by a narrow margin.
10. device according to claim 7, it is characterized in that, described first regulated quantity and described second regulated quantity all change datum quantity to determine according to cyclone, and wherein, described cyclone changes datum quantity and determines according to described current pressure variable quantity.
11. devices according to claim 7, is characterized in that, also comprise:
Second increases module, for being less than reasonable upper pressure limit value in response to described current pressure values and being greater than reasonable low pressure limit value and described current pressure changing value is greater than the 3rd change threshold, with the 3rd regulated quantity, the current unlatching quantity of cyclone in described grading plant is increased to the 3rd quantity, to control the transfer pressure of described grading plant by the cyclone opening described 3rd quantity;
3rd keeps module, for being less than reasonable upper pressure limit value in response to described current pressure values and being greater than reasonable low pressure limit value and described current pressure changing value is less than the 3rd change threshold and is greater than the 4th change threshold, keep the current unlatching quantity of cyclone in described grading plant constant, to control the transfer pressure of described grading plant by the cyclone opening described current unlatching quantity;
Second reduces module, for being less than reasonable upper pressure limit value in response to described current pressure values and being greater than reasonable low pressure limit value and described current pressure changing value is less than the 4th change threshold, with the 4th regulated quantity, the current unlatching quantity of cyclone in described grading plant is reduced to the 4th quantity, to control the transfer pressure of described grading plant by the cyclone opening described 4th quantity;
Wherein, described 3rd change threshold is greater than 0, and described 4th change threshold is less than 0.
12. devices according to claim 7, is characterized in that, also comprise:
Judge module, for judging whether moment institute's elapsed time that described current time changes apart from the unlatching quantity of cyclone in last described grading plant reaches the constraint cycle more than;
Trigger module, for when the judged result of described judge module is for being, triggers described analysis module.
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CN103706469A (en) * 2013-12-24 2014-04-09 中冶长天国际工程有限责任公司 Method and device for controlling liquid level of pulp pump pool in process of ore grinding classification
CN203830127U (en) * 2014-01-14 2014-09-17 中国矿业大学 Closed type automatic control system for ore grinding classification

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* Cited by examiner, † Cited by third party
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US4470901A (en) * 1982-07-28 1984-09-11 Bethlehem Steel Corp. System for controlling separating gravity in dense-media cyclone
JPH10185792A (en) * 1996-12-26 1998-07-14 Sumitomo Osaka Cement Co Ltd Method and apparatus for measurement of fineness, method and apparatus of control of pulverization process as well as powder manufacturing apparatus
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