CN101950171A - Intelligent hierarchical control method and control device for ore grinding in concentration plant - Google Patents
Intelligent hierarchical control method and control device for ore grinding in concentration plant Download PDFInfo
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Abstract
The invention relates to the technical field of ore grinding control in a concentration plant, in particular to an intelligent hierarchical control method and a control device for ore grinding in a concentration plant. The control method comprises the following program processes: controlling system initialization; judging whether ore feeding quantity control is implemented or not; implementing ore feeding quantity PID control; judging whether ore water feeding control is implemented or not; implementing the ore water feeding control; judging whether ore water discharging control is implemented or not; implementing the ore water discharging control; judging whether cyclone inlet pulp density and water replenishing cascade control is implemented or not; judging whether pump sump liquid level control is implemented or not; implementing the pump sump liquid level control; judging whether the ore grinding process is finished or not; finishing the ore grinding process; judging whether to return or not; and carrying out interconnected control on each processing device. The device comprises an upper computer, a lower computer, a detecting instrument and an executing mechanism. The invention enables the system to have the characteristics of high control accuracy, high regulating speed, strong interference resistance, stability, reliability and the like, accurately regulates the operating parameters in real time, and improves the working efficiency and the product quality of grinding classification.
Description
Technical field
The present invention relates to ore grinding control technology field, ore dressing plant, particularly a kind of ore dressing plant ore grinding intelligence hierarchical control method and opertaing device.
Background technology
Grinding procedure mainly is with the particle of ore through milled processed beading degree level, offers ore-dressing technique, prepares to meet the raw material of ore dressing production granularity for ore-dressing technique, is the preparatory process of ore-dressing technique.After the grinding of ore process physics, the classification, particle is varied down to certain degree, and just can reach the monomer dissociation of ore or be similar to monomer dissociation, in theory, thin more metal recovery and the metal enrichment that helps ore-dressing technique more of grinding particle size.Therefore grinding process is to influence the key link that ore dressing is produced, and it is directly restricting dressing product quality and metal recovery rate.But grinding particle size is thin more, and its energy consumption is big more, and the grinding process energy consumption accounts for 40% ~ 60% of the whole ore dressing process in ore dressing plant.Therefore, when guaranteeing grinding particle size, also to cut down the consumption of energy as much as possible, save material.In order to improve grinding efficiency, to save energy and reduce the cost, improve the economic benefit in concentrate grade and the recovery and raising ore dressing plant, realize that the automatic control of grinding process has crucial economic implications.
As shown in Figure 1, grinding process generally is divided into two sections grindings and classification.First section ore grinding generally adopts autogenous grinding or Semi-Autogenous mode, mining factory is shipped relatively large ore tentatively grinds, iron ore slurry after the grinding carries out classification by one section cyclone, and its overflow flows to the next stage ore grinding, and its underflow turns back to first section autogenous tumbling mill and grinds again.Second section ore grinding adopts ball milling method, and the iron ore that first section autogenous tumbling mill ground continues to grind, and carries out classification once more by two sections cyclones then, and its overflow flows to mineral processing circuit, and its underflow turns back to second section bowl mill and grinds again.
Along with international iron ore price goes up significantly, the exploitation of China's iron ore and sort and highlight increasing economic worth and strategic value.And the quality of grind grading directly influences the grade height of ore dressing finished product, so the classification of grind grading intelligence has very important vital role.Yet what partly taked grind grading in present most of ore dressing plants is simple control automatically, even still adopts manually operated method, and not only efficient is low, and error is also bigger.
Summary of the invention
The objective of the invention is to overcome top described problem, a kind of ore dressing plant ore grinding intelligence hierarchical control method is provided, can better improve the effect of grind grading, thereby enhance productivity greatly, reduce cost.
Another object of the present invention provides a kind of ore dressing plant ore grinding intelligence step control equipment.
Ore dressing plant of the present invention ore grinding intelligence hierarchical control method is characterized in that comprising following program circuit:
1) control system initialization,
2) judge whether to implement mine-supplying quantity control, judgement is, then implements mine-supplying quantity PID control,
3) judge not and implement mine-supplying quantity PID control and finish, then judge whether to implement that judgement is, then implement to mineral water control to mineral water control,
4) judge not and implement that control finishes to mineral water, then judge whether to implement the ore discharge water management, judgement is, then implements the ore discharge water management,
5) judge not and implement the ore discharge water management and finish, then judge whether to implement cyclone inlet pulp density and add the control of water tandem that judgement is, then implement cyclone inlet pulp density and add the control of water tandem,
6) judge not and implement cyclone inlet pulp density and add the control of water tandem and finish, then judge whether to implement the control of pump pit level, judgement is, then implements the control of pump pit level,
7) judgement is denied and is implemented pump pit level control end, judges then whether ore grinding finishes, and judgement is that then ore grinding end is judged not, then returns the 1st) step,
8) each process equipment is carried out interlocked control.
When system was in described interlocked control state, according to the flow process of grinding process, the backward that realizes each process equipment starts and order is stopped, and the stopping in emergency of total system, and each technology interlock device realizes that interlocking stops simultaneously.For example, described interlocked control is that the load interlocking of ore feeder and one section autogenous grinding and two sections ball millings starts or stops, and when " tripe expands " appearred in one section autogenous grinding, control system stopped automatically to the ore deposit, after " tripe expands " solves, recovered to give the ore deposit automatically.When " tripe expands " appears in two sections ball millings, control system also will stop to the ore deposit automatically, and stop one section autogenous grinding operation, after " tripe expands " solves, recover automatically to give the ore deposit and move from bowl mill.So-called " tripe expands " is exactly that the interior ore of ball bowl mill is too much, and the ball bowl mill can not normally be moved.
Described mine-supplying quantity PID is controlled to be respectively with the mine-supplying quantity setting value, belt claims value of feedback to be input to the PID controller, the output quantity of PID controller outputs to vibrofeeder, mine-supplying quantity is by controlling for the ore control loop, should form by belt conveyer scale and vibrofeeder to the plant equipment in ore control loop, should directly control the frequency converter of vibrofeeder to the output valve in ore control loop, regulate the rotating speed of vibrofeeder by frequency converter, thereby adjusting mine-supplying quantity, should be provided with manual control and two kinds of control modes of automatic control type to the ore control loop, when ordinary production, use automatic control mode, when overhauling and safeguarding, use manual control mode.
Described cyclone inlet pulp density and add the water tandem and be controlled to be respectively with the pulp density setting value, pulp density claims value of feedback to be input to one-level PID controller, the output quantity of one-level PID controller is as adding the discharge setting value, be input to secondary PID controller with adding the discharge value of feedback, the output of secondary PID controller is used for control and adds Water flow adjusting valve, the pid control circuit that water management is a closed loop is added in the pump pond, the pid control circuit of this closed loop is made up of flowmeter and motorized valve, by the value of feedback of adding the water pipe flow is regulated electrically operated valve, thereby realize the water yield of adding in control pump pond, the concentration control of pump pond also is a pid control circuit, add the water management loop by densimeter and pump pond and constitute tandem control jointly, its principal parameter is a pump pond concentration, second parameter is that discharge is added in the pump pond, when the pump pond was added water management loop and concentration control loop and is arranged to automated manner simultaneously, this moment, tandem control brought into operation.
Describedly be controlled to be bowl mill to mineral water and give the control of mineral water flow mathematical model, by giving the control of mineral water control loop, this control loop is made up of flowmeter and motorized valve, this loop is by the feedback of drainpipe flow being regulated the size of motorized valve aperture, thereby the mineral water flow is given in control, this control loop also is a pid control circuit, but the setting value of amount of water is by parameters such as the total amount of bowl mill materials inside and water percentage are set up mathematical model, and bowl mill adds the mathematical model that discharge calculates to the ore deposit and is:
That is:
Wherein: F: bowl mill is given the ore deposit amount of water;
W
1: bowl mill raw ore mine-supplying quantity;
W
2: bowl mill sand return amount;
M
1: feed ore concentration;
M
2: sand return concentration;
M
3: ore milling concentration;
C: sand return ratio.
The humidity, sand return amount and the sand return humidity that should be pointed out that supposition ore in this system are stable, and above-mentioned model could be effectively.Draw by calculated with mathematical model, and have only when this control loop under automatic running status, the setting value that could use calculated with mathematical model to draw.Above-mentioned various in concrete parameter determine according to concrete mine conditions is different.
Described mine-supplying quantity is controlled to be the fuzzy control of mine-supplying quantity and other parameter, Fuzzy control system is adjusted mine-supplying quantity and other parameter automatically according to the running status of ball bowl mill, when system is in fuzzy control, control system is with automatic power and Changing Pattern thereof according to bowl mill, judge the running status of bowl mill, promptly when the power increase, the ore grinding quantitative change in the bowl mill is big, should reduce the setting value of bowl mill mine-supplying quantity this moment, thereby the ore grinding amount in the bowl mill is met the requirements of in the scope.Otherwise when the power minimizing, the ore grinding quantitative change in the bowl mill is little, and should increase the setting value of bowl mill mine-supplying quantity this moment, thereby the ore grinding amount in the bowl mill is met the requirements of in the scope.Under the fuzzy control state, according to the condition of production, change a setup parameter every one period regular time, interval time should be decided according to on-the-spot practical condition, and general adjustment in 25～35 minutes at interval once.
Described mine-supplying quantity is controlled to be the fuzzy control of regulating mine-supplying quantity according to the power of bowl mill and rate of change thereof.Fuzzy system inquires about to determine mine-supplying quantity according to the variable power e and the rate of change ec of bowl mill by fuzzy rule.
Design of Fuzzy Control System:
(1) linguistic variable of fuzzy control
The same with most of Fuzzy control systems, we adopt the system architecture of the single output of dual input, because voltage is constant, we consider the variation of power by monitoring current.In this Fuzzy control system, we with the electric current of reality and in theory the variable quantity ec of the deviation e between the electric current of operate as normal and deviation as input, the variable quantity of mine-supplying quantity
As output.
(2) input language variable error e, error rate ec and output language variable
The basic domain of assignment list language variable current deviation e elect [20A ,+20A] as, the basic domain of deviation variation rate ec is elected [4A ,+4A], mine-supplying quantity variable quantity as
Basic domain elect [12t/h ,+12t/h] as.Selected
The domain of fuzzy set be 6 ,-5 ,-4 ,-3 ,-2 ,-1,0,1,2,3,4,5,6}, the then quantizing factor of deviation e
, the quantizing factor of deviation variation rate ec
, give the ore deposit variable quantity
Scale factor
The language value of these three linguistic variables is all chosen 7 language value: PB, PM, PS, ZE, NS, NM, NB.
Rule of thumb, can determine on each domain in order to describe fuzzy subset PB, PM, PS, ZE, NS, NM, the membership function of NB
, and it is as shown in table 1 to set up the assignment table of linguistic variable e in view of the above, the assignment table of ec is as shown in table 2,
The assignment table as shown in table 3.
Based on summary of experience, draw the control law that one group of 49 fuzzy condition statement constitutes, these fuzzy condition statements are concluded, set up the fuzzy control state table of reflection ball bowl mill mine-supplying quantity control system, as shown in table 4.
Each bar fuzzy condition statement that fringe table 4 comprises all determines a fuzzy relation, and they have 49, promptly
By the union of 49 fuzzy relations, obtain total fuzzy relation and be:
Based on the reasoning composition rule, and use the maximum membership degree method this fuzzy set is carried out fuzzy judgment, we set up question blank as shown in table 5.
Like this, by the PLC program, in each sampling period, by calculating deviate
Change with deviation
, multiply by quantizing factor separately respectively, obtain required e of question blank and ec, and then find corresponding
, multiply by scale factor, promptly obtain the variable quantity of actual mine-supplying quantity, add original mine-supplying quantity, be the mine-supplying quantity of the ball bowl mill of current PLC output, realized the automatic control of ball bowl mill mine-supplying quantity like this.
A kind of equipment that is used for described ore dressing plant ore grinding intelligence hierarchical control method, it is characterized in that comprising host computer, by the Industrial Ethernet joining slave computer of host computer therewith, by controlling the net joining measuring instrument of slave computer, topworks therewith, form the control system that integrates functions such as detection, control, monitoring management.
Described slave computer is the PLC system, comprises power module, the joining CPU of power module therewith, joining, the one group of I/O template being set up in parallel of power module, CPU therewith respectively.
Described measuring instrument comprises to the ore deposit flow instrumentation, adds discharge measuring instrument, bowl mill bearing temperature measuring instrument, pump pit level measuring instrument, cyclone entrance concentration measuring instrument for mineral water flow instrumentation, ore discharge discharge measuring instrument, pump pond.
Described topworks comprises device start/shut-down mechanism, frequency control mechanism, valve regulated mechanism.
Host computer major control function comprises that grinding process control flow chart, control panel operation, real time data demonstration, equipment running status demonstration, motorized valve control, alarm indication, equipment open/stops, control mode is selected and multinomial function such as audio alert.Slave computer is responsible for data acquisition and control, can break away from upper main frame and work alone, and host computer is responsible for the monitoring management of control system, and host computer carries out communication by a built-in Industrial Ethernet network interface card and slave computer.
Software system design of the present invention comprises the Control Software of slave computer PLC and the monitoring software design of host computer.The design of PLC Control Software mainly comprises writing of hardware configuration and parameter setting, communication definitions and user program etc.The control program of native system is mainly controlled, is added water management to mineral water control, ore discharge water management, pump pond by master routine and the sequential control of bowl mill ore feeder, mine-supplying quantity.Subroutine modules such as the control of cyclone entrance concentration, the control of pump pit level control enclosure motorized valve constitute.Whether each subroutine call will be judged according to the relevant controlled variable that host computer passes down.Design 1s interrupt routine module and 100ms cycle interruption handler module in addition, wherein the 1s interrupt routine is used for realizing the fuzzy control and the parameter warning function of bowl mill, and 100ms cycle interruption handling procedure is used for realizing the calculating of data sampling and bowl mill reference current value and the functions such as " tripe expands " judgement of bowl mill.
Have high reliability, high anti-jamming capacity in order to ensure control system, native system has adopted different control methods such as interlocked control, PID control, tandem control, mathematical model control, fuzzy control, realizes the intellectuality control of grind grading jointly.
When system was in the interlocked control state, according to the flow process of grinding process, the backward that realizes each process equipment starts and order is stopped, and the stopping in emergency of total system, and each technology interlock device realizes that interlocking stops simultaneously.For example, ore feeder and one section load interlocking from break-in and two sections ball millings start or stop, and when " tripe expands " appearred in one section autogenous grinding, control system stopped automatically to the ore deposit, after " tripe expands " solves, recovered to give the ore deposit automatically.When " tripe expands " appears in two sections ball millings, control system also will stop to the ore deposit automatically, and stop one section autogenous grinding operation, after " tripe expands " solves, recover to give ore deposit and bowl mill operation automatically.
Now, along with fast development of computer technology, at present the PLC of most of world-famous brands can both satisfy to big inertia, the time become, nonlinear grind grading process realizes intelligent control.
Characteristics such as the present invention has adopted interlocked control, and different control methods such as tandem control, fuzzy control make system have the control accuracy height, and governing speed is fast, antijamming capability is strong, reliable and stable.Use this method control grinding process have easy to operate, control flexibly, reliable in quality, powerful, can regulate operating parameter real-time and accurately, and then improve the work efficiency and the product quality of grind grading, economic benefit and obvious social benefit improve.
Description of drawings
Fig. 1 is the grinding process process flow diagram.
Fig. 2 is a control method process flow diagram of the present invention.
Fig. 3 is a PID control synoptic diagram of the present invention.
Fig. 4 is a tandem control synoptic diagram of the present invention.
Fig. 5 is a device structure block diagram of the present invention.
Embodiment
Further specify the specific embodiment of the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, grinding process generally is divided into two sections grindings and classification.First section ore grinding generally adopts autogenous grinding or Semi-Autogenous mode, mining factory is shipped relatively large ore tentatively grinds, iron ore slurry after the grinding carries out classification by one section cyclone, and its overflow flows to the next stage ore grinding, and its underflow turns back to first section autogenous tumbling mill and grinds again.Second section ore grinding adopts ball milling method, and the iron ore that first section autogenous tumbling mill ground continues to grind, and carries out classification once more by two sections cyclones then, and its overflow flows to mineral processing circuit, and its underflow turns back to second section bowl mill and grinds again.
As shown in Figure 2, ore dressing plant of the present invention ore grinding intelligence hierarchical control method is characterized in that comprising following program circuit:
1) control system initialization,
2) judge whether to implement mine-supplying quantity control, judgement is, then implements mine-supplying quantity PID control,
3) judge not and implement mine-supplying quantity PID control and finish, then judge whether to implement that judgement is, then implement to mineral water control to mineral water control,
4) judge not and implement confluent control and finish, judge whether to implement the ore discharge water management, judgement is, then implements the ore discharge water management,
5) judge not and implement water discharge control and finish, then judge whether to implement cyclone inlet pulp density and add the control of water tandem that judgement is, then implement cyclone inlet pulp density and add the control of water tandem,
6) judge not and implement cyclone inlet pulp density and add the control of water tandem and finish, then judge whether to implement the control of pump pit level, judgement is, then implements the control of pump pit level,
7) judgement is denied and is implemented pump pit level control end, judges then whether ore grinding finishes, and judgement is that then ore grinding end is judged not, then returns the 1st) step,
8) each process equipment is carried out interlocked control.
When system was in described interlocked control state, according to the flow process of grinding process, the backward that realizes each process equipment starts and order is stopped, and the stopping in emergency of total system, and each technology interlock device realizes that interlocking stops simultaneously.For example, described interlocked control is that the load interlocking of ore feeder and one section autogenous grinding and two sections ball millings starts or stops, and when " tripe expands " appearred in one section autogenous grinding, control system stopped automatically to the ore deposit, after " tripe expands " solves, recovered to give the ore deposit automatically.When " tripe expands " appears in two sections ball millings, control system also will stop to the ore deposit automatically, and stop one section autogenous grinding operation, after " tripe expands " solves, recover to give ore deposit and autogenous tumbling mill operation automatically.
As shown in Figure 3, described mine-supplying quantity PID is controlled to be respectively with the mine-supplying quantity setting value, belt claims value of feedback to be input to the PID controller, the output quantity of PID controller outputs to vibrofeeder, mine-supplying quantity is by controlling for the ore control loop, the plant equipment of this control loop is made up of belt conveyer scale and vibrofeeder, should directly control the frequency converter of vibrofeeder to the output valve in ore control loop, regulate the rotating speed of vibrofeeder by frequency converter, thereby adjusting mine-supplying quantity, should be provided with manual control and control two kinds of control modes automatically to the ore control loop, when ordinary production, use automatic control mode, when overhauling and safeguarding, use manual control mode.
As shown in Figure 4, described cyclone inlet pulp density and add the water tandem and be controlled to be respectively with the pulp density setting value, pulp density claims value of feedback to be input to one-level PID controller, the output quantity of one-level PID controller is as adding the discharge setting value, be input to secondary PID controller with adding the discharge value of feedback, the output of secondary PID controller is used for control and adds Water flow adjusting valve, the pid control circuit that water management is a closed loop is added in the pump pond, the pid control circuit of this closed loop is made up of flowmeter and motorized valve, by the value of feedback of adding the water pipe flow is regulated electrically operated valve, thereby realize the water yield of adding in control pump pond, the concentration control of pump pond also is a pid control circuit, add the water management loop by densimeter and pump pond and constitute tandem control jointly, its principal parameter is a pump pond concentration, second parameter is that discharge is added in the pump pond, when the pump pond was added water management loop and concentration control loop and is arranged to automated manner simultaneously, this moment, tandem control brought into operation
Describedly be controlled to be grinding machine to mineral water and give the control of mineral water flow mathematical model, by giving the control of mineral water control loop, this control loop is made up of flowmeter and motorized valve, this loop is by the feedback of drainpipe flow being regulated the size of motorized valve aperture, thereby the mineral water flow is given in control, this control loop also is a pid control circuit, but the setting value of amount of water is by parameters such as the total amount of grinding machine materials inside and water percentage are set up mathematical model, and grinding machine adds the mathematical model that discharge calculates to the ore deposit and is:
That is:
Wherein: F: grinding machine is given the ore deposit amount of water;
W
1: grinding machine raw ore mine-supplying quantity;
W
2: grinding machine sand return amount;
M
1: feed ore concentration;
M
2: sand return concentration;
M
3: ore milling concentration;
C: sand return ratio.
The humidity, sand return amount and the sand return humidity that should be pointed out that supposition ore in this system are stable, and above-mentioned model could be effectively.Draw by calculated with mathematical model, and have only when this control loop under automatic running status, the setting value that could use calculated with mathematical model to draw.Above-mentioned various in concrete parameter determine according to concrete mine conditions is different.
Described mine-supplying quantity is controlled to be the fuzzy control of mine-supplying quantity and other parameter, Fuzzy control system is adjusted mine-supplying quantity and other parameter automatically according to the running status of bowl mill, when system is in fuzzy control, control system is with automatic power and Changing Pattern thereof according to bowl mill, judge the running status of bowl mill, the i.e. ore grinding quantitative change that increases in the bowl mill when power is big, and should reduce the setting value of bowl mill mine-supplying quantity this moment, thereby the ore grinding amount in the bowl mill is met the requirements of in the scope.Otherwise little when the ore grinding quantitative change that power reduces in the bowl mill, should increase the setting value of bowl mill mine-supplying quantity this moment, thereby the ore grinding amount in the bowl mill is met the requirements of in the scope.Under the fuzzy control state, according to the condition of production, change a setup parameter every one period regular time, interval time should be decided according to on-the-spot practical condition, and general adjustment in about 25～35 minutes at interval once.
Described mine-supplying quantity is controlled to be the fuzzy control of regulating mine-supplying quantity according to the power of bowl mill and rate of change thereof.Fuzzy system inquires about to determine mine-supplying quantity according to the variable power e and the rate of change ec of bowl mill by fuzzy rule.
Design of Fuzzy Control System:
(1) linguistic variable of fuzzy control
The same with most of Fuzzy control systems, we adopt the system architecture of the single output of dual input, because voltage is constant, consider the variation of power by monitoring current.In this Fuzzy control system, with the electric current of reality and in theory the variable quantity ec of the deviation e between the electric current of operate as normal and deviation as input, the variable quantity of mine-supplying quantity
As output.
(2) input language variable error e, error rate ec and output language variable
The assignment table
The basic domain of linguistic variable current deviation e is elected [20A ,+20A] as, and the basic domain of deviation variation rate ec is elected [4A ,+4A], mine-supplying quantity variable quantity as
Basic domain elect [12t/h ,+12t/h] as.Selected
The domain of fuzzy set be 6 ,-5 ,-4 ,-3 ,-2 ,-1,0,1,2,3,4,5,6}, the then quantizing factor of deviation e
, the quantizing factor of deviation variation rate ec
, give the ore deposit variable quantity
Scale factor
The language value of these three linguistic variables is all chosen 7 language value: PB, PM, PS, ZE, NS, NM, NB.
Rule of thumb, can determine on each domain in order to describe fuzzy subset PB, PM, PS, ZE, NS, NM, the membership function of NB
, and it is as shown in table 1 to set up the assignment table of linguistic variable e in view of the above, the assignment table of ec is as shown in table 2,
The assignment table as shown in table 3.
Based on summary of experience, draw the control law that one group of 49 fuzzy condition statement constitutes, these fuzzy condition statements are concluded, set up the fuzzy control state table of reflection ball bowl mill mine-supplying quantity control system, as shown in table 4.
By the union of 49 fuzzy relations, obtain total fuzzy relation and be:
Based on the reasoning composition rule, and use the maximum membership degree method this fuzzy set is carried out fuzzy judgment, set up question blank as shown in table 5.
Like this, by the PLC program, in each sampling period, by calculating deviate
Change with deviation
, multiply by quantizing factor separately respectively, obtain required e of question blank and ec, and then find corresponding
, multiply by scale factor, promptly obtain the variable quantity of actual mine-supplying quantity, add original mine-supplying quantity, be the mine-supplying quantity of the bowl mill of current PLC output, realized the automatic control of bowl mill mine-supplying quantity like this.
As shown in Figure 5, a kind of equipment that is used for described ore dressing plant ore grinding intelligence hierarchical control method, it is characterized in that comprising host computer, by the Industrial Ethernet joining slave computer of host computer therewith, by controlling the net joining measuring instrument of slave computer, topworks therewith, form collection and detect, functions such as control, monitoring management are in the control system of one
Described slave computer is the PLC system, comprises power module, the joining CPU of power module therewith, and joining, the one group of I/O template being set up in parallel of power module, CPU therewith respectively,
Described measuring instrument comprises to the ore deposit flow instrumentation, adds discharge measuring instrument, bowl mill bearing temperature measuring instrument, pump pit level measuring instrument, cyclone entrance concentration measuring instrument for mineral water flow instrumentation, ore discharge discharge measuring instrument, pump pond
Described topworks comprises device start/shut-down mechanism, frequency control mechanism, valve regulated mechanism.
Characteristics such as the present invention has adopted interlocked control, and different control methods such as tandem control, fuzzy control make system have the control accuracy height, and governing speed is fast, antijamming capability is strong, reliable and stable.Use this method control grinding process have easy to operate, control flexibly, reliable in quality, powerful, can regulate operating parameter real-time and accurately, and then improve the work efficiency and the product quality of grind grading, economic benefit and obvious social benefit improve.
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Claims (10)
1. ore dressing plant ore grinding intelligence hierarchical control method is characterized in that comprising following program circuit:
1) control system initialization,
2) judge whether to implement mine-supplying quantity control, judgement is, then implements mine-supplying quantity PID control,
3) judge not and implement mine-supplying quantity PID control and finish, then judge whether to implement that judgement is, then implement to mineral water control to mineral water control,
4) judge not and implement that control finishes to mineral water, judge whether to implement the ore discharge water management, judgement is, then implements the ore discharge water management,
5) judge not and implement the ore discharge water management and finish, then judge whether to implement cyclone inlet pulp density and add the control of water tandem that judgement is, then implement cyclone inlet pulp density and add the control of water tandem,
6) judge not and implement cyclone inlet pulp density and add the control of water tandem and finish, then judge whether to implement the control of pump pit level, judgement is, then implements the control of pump pit level,
7) judgement is denied and is implemented pump pit level control end, judges then whether ore grinding finishes, and judgement is that then ore grinding end is judged not, then returns the 1st) step,
8) each process equipment is carried out interlocked control.
2. ore dressing plant according to claim 1 ore grinding intelligence hierarchical control method, it is characterized in that when system is in described interlocked control state, flow process according to grinding process, the backward that realizes each process equipment starts and the order parking, and the stopping in emergency of total system, each technology interlock device realizes that interlocking stops simultaneously.
3. ore dressing plant according to claim 1 ore grinding intelligence hierarchical control method, it is characterized in that described mine-supplying quantity PID is controlled to be respectively with the mine-supplying quantity setting value, belt claims value of feedback to be input to the PID controller, the output quantity of PID controller outputs to vibrofeeder, described mine-supplying quantity is by controlling for the ore control loop, should form by belt conveyer scale and vibrofeeder to the plant equipment in ore control loop, should directly control the frequency converter of vibrofeeder to the output valve in ore control loop, regulate the rotating speed of vibrofeeder by frequency converter, thereby adjusting mine-supplying quantity, should be provided with manual control and control two kinds of control modes automatically to the ore control loop, when ordinary production, use automatic control mode, when overhauling and safeguarding, use manual control mode.
4. ore dressing plant according to claim 1 ore grinding intelligence hierarchical control method, it is characterized in that described cyclone inlet pulp density and add the water tandem being controlled to be respectively with the pulp density setting value, pulp density claims value of feedback to be input to one-level PID controller, the output quantity of one-level PID controller is as adding the discharge setting value, be input to secondary PID controller with adding the discharge value of feedback, the output of secondary PID controller is used for control and adds Water flow adjusting valve, the pid control circuit that water management is a closed loop is added in the pump pond, the pid control circuit of this closed loop is made up of flowmeter and motorized valve, by the value of feedback of adding the water pipe flow is regulated electrically operated valve, thereby realize the water yield of adding in control pump pond, the concentration control of pump pond also is a pid control circuit, add the water management loop by densimeter and pump pond and constitute tandem control jointly, its principal parameter is a pump pond concentration, second parameter is that discharge is added in the pump pond, when the pump pond was added water management loop and concentration control loop and is arranged to automated manner simultaneously, this moment, tandem control brought into operation.
5. ore dressing plant according to claim 1 ore grinding intelligence hierarchical control method, it is characterized in that describedly being controlled to be bowl mill to mineral water and giving the control of mineral water flow mathematical model, by giving the control of mineral water control loop, this control loop is made up of flowmeter and motorized valve, this control loop is by the feedback of drainpipe flow being regulated the size of motorized valve aperture, thereby the mineral water flow is given in control, this control loop also is a pid control circuit, but the setting value of amount of water is to set up mathematical model by total amount and water percentage to the bowl mill materials inside, draw by calculated with mathematical model, and have only when this control loop under automatic running status, the setting value that could use calculated with mathematical model to draw.
6. ore dressing plant according to claim 1 ore grinding intelligence hierarchical control method, it is characterized in that described mine-supplying quantity is controlled to be the fuzzy control of mine-supplying quantity and other parameter, Fuzzy control system is adjusted mine-supplying quantity and other parameter automatically according to the running status of bowl mill, when system is in fuzzy control, control system is with automatic power and Changing Pattern thereof according to bowl mill, judge the running status of bowl mill, promptly when the power increase, ore grinding quantitative change in the bowl mill is big, should reduce the setting value of bowl mill mine-supplying quantity this moment, thereby the ore grinding amount in the bowl mill is met the requirements of in the scope, otherwise when power reduces, ore grinding quantitative change in the bowl mill is little, and should increase the setting value of bowl mill mine-supplying quantity this moment, thereby the ore grinding amount in the bowl mill is met the requirements of in the scope, under the fuzzy control state, according to the condition of production, change a setup parameter every one period regular time, interval time should be decided to be per 25～35 minutes according to on-the-spot practical condition and adjust once.
7. the ore dressing plant ore grinding intelligence hierarchical control method of stating according to claim 1, it is characterized in that described interlocked control is that the load interlocking of ore feeder and one section autogenous grinding and two sections ball millings starts or stops, when " tripe expands " appears in one section autogenous grinding, control system stops automatically to the ore deposit, after " tripe expands " solves, automatically recover to give the ore deposit, when " tripe expands " appears in two sections ball millings, control system also will stop to the ore deposit automatically, and stop one section autogenous grinding operation, after " tripe expands " solves, recover to give ore deposit and autogenous tumbling mill operation automatically.
8. the ore dressing plant ore grinding intelligence hierarchical control method of stating according to claim 5 is characterized in that described mathematical model is:
That is:
Wherein: F: bowl mill is given the ore deposit amount of water,
W
1: bowl mill raw ore mine-supplying quantity,
W
2: bowl mill sand return amount,
M
1: feed ore concentration,
M
2: sand return concentration,
M
3: ore milling concentration,
C: sand return ratio.
9. ore dressing plant according to claim 6 ore grinding intelligence hierarchical control method, it is characterized in that described fuzzy control is for realizing the automatic control of bowl mill mine-supplying quantity, correlation parameter comprises the electric current of bowl mill, the mine-supplying quantity of bowl mill, bowl mill sand return amount, control system is automatically according to the power and the Changing Pattern thereof of bowl mill, judge the running status of bowl mill, promptly when the power increase, ore grinding quantitative change in the bowl mill is big, reduce the setting value of bowl mill mine-supplying quantity this moment, thereby the ore grinding amount in the bowl mill is met the requirements of in the scope, when power reduces, ore grinding quantitative change in the bowl mill is little, should increase the setting value of bowl mill mine-supplying quantity this moment, thereby the ore grinding amount in the bowl mill is met the requirements of in the scope, under the fuzzy control state, according to the condition of production, change a setup parameter every one period regular time, interval time should be decided to be per 25～35 minutes according to on-the-spot practical condition and adjust once.
10. equipment that is used for the described ore dressing plant of claim 1 ore grinding intelligence hierarchical control method, it is characterized in that comprising host computer, by the Industrial Ethernet joining slave computer of host computer therewith, by controlling the net joining measuring instrument of slave computer, topworks therewith, form the control system that integrates detection, control, monitoring management function
Described slave computer is the PLC system, comprises power module, the joining CPU of power module therewith, and joining, the one group of I/O template being set up in parallel of power module, CPU therewith respectively,
Described measuring instrument comprises to the ore deposit flow instrumentation, adds discharge measuring instrument, bowl mill bearing temperature measuring instrument, pump pit level measuring instrument, cyclone entrance concentration measuring instrument for mineral water flow instrumentation, ore discharge discharge measuring instrument, pump pond
Described topworks comprises device start/shut-down mechanism, frequency control mechanism, valve regulated mechanism.
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