CN116273423A - Crushing system control method based on cyclic load - Google Patents
Crushing system control method based on cyclic load Download PDFInfo
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- 125000004122 cyclic group Chemical group 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012216 screening Methods 0.000 claims abstract description 62
- 239000000047 product Substances 0.000 claims abstract description 34
- 238000005303 weighing Methods 0.000 claims abstract description 30
- 239000012467 final product Substances 0.000 claims abstract description 17
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The application discloses a crushing system control method based on cyclic load, which comprises the following steps: the method comprises the steps of calculating and controlling cyclic load through a product granularity curve of a crusher in a crushing system and screening efficiency of screening equipment, and determining a numerical range of the cyclic load according to screening efficiency fluctuation caused by ore properties; the method comprises the steps of acquiring weighing conveying quantity in real time through a feeding belt conveyor belt balance, a returning belt conveyor belt balance and a final product belt conveyor belt balance, carrying out balance correction on the mineral quantity according to the weighing conveying quantity, and calculating an actual circulating load through the conveying quantity obtained through weighing after the balance correction; and (3) according to the comparison between the actual circulating load and the control circulating load, adjusting the ore discharge port and the ore feeding quantity parameters of the crusher, and recalculating the actual circulating load until the actual circulating load is within the control range of the control circulating load. According to the method, the running state of the crushing system is indirectly reflected through the cyclic load fluctuation analysis, the degree of automation is high, and the labor intensity of operators can be greatly reduced.
Description
Technical Field
The invention relates to the technical field of crushing, in particular to a crushing system control method based on cyclic load.
Background
The crushing system and the grinding system form an ore preparation link of the concentrating mill, the product quality of the crushing system directly influences the operation and cost of the subsequent grinding system, and the crushing system is a key link for realizing more crushing and less grinding. The crushing system is typically comprised of a medium crushing, fine crushing, screening, and connecting each of the job belt conveyors. The medium crushing is usually a cone crusher, the fine crushing is usually a cone crusher or a high-pressure roller mill, and in special cases, the superfine crushing operation is carried out. The basic control of actual production operation of the crushing system of the mineral processing plant mainly comprises the linkage control of automatic start and stop of the whole system, the linkage control of automatic stop of the accident state of the crushing system, the power control of a local cone crusher (for example, the invention patent application publication number: CN 106345600A) and the like. Control methods and strategies based on the whole crushing system are not yet involved. The main reason is that in the actual production process, production managers and actual operators do not normally analyze, evaluate and control indexes and parameters such as balance, stability and energy consumption of the whole system. In most cases, once unstable production and deviation of technological parameters are encountered, and the subsequent production needs cannot be met, detailed and systematic flow investigation work is usually carried out on the crushing system by corresponding manpower and material resources of factories or workshops. The problems are ascertained through flow investigation, specific reasons are analyzed, control strategies and improvement measures are researched and formulated on the basis of the problems, and then the problems are solved, the production is stabilized, and qualified products are obtained through adjustment.
Applicant analyzes the current state of the art of crushing systems, which have the following outstanding problems and drawbacks in terms of control, automation, intellectualization:
(1) The product granularity of the crushing system is not changed greatly, the product granularity is easy to achieve, and the crushing system generally has a flexible maintenance space, so that the control requirement is low, and the automatic and intelligent technology implementation of the crushing system is not greatly improved. For example, in a crushing system, automation and intelligent degrees of a jaw crusher, a cone crusher and the like are relatively high, but intelligent demands of screening equipment, a belt conveyor and the like are relatively low, and the whole system is low.
(2) The current control of the crushing system is mainly focused on the granularity of the final product, when the granularity of the product is problematic, the ore discharge opening of the middle and fine crushing equipment is usually adjusted by adopting a manual means, the control parameters of the high-pressure roller mill are adjusted, and the labor intensity of manual operation is high.
(3) At present, the ore feeding amount of screening operation is not detected and controlled. The screening work ore feeding amount directly influences the screening work load, the screening efficiency and the quality of the undersize products; meanwhile, the processing capacity of a subsequent fine crushing and high-pressure roller mill can be influenced by the quantity of the oversize materials in the screening operation.
(4) The feeding equipment at the front end of the current crusher can adjust the feeding amount according to the hopper material level at the upper part of the cone crusher when the automation degree is high, so that the crusher is guaranteed to be fully fed, but the power, the subsequent product amount and the product granularity are not usually concerned, and no system consideration is caused.
(5) The current crushing system has no control target and no control means, and the energy consumption, the lining plate consumption condition, the processing capacity fluctuation and the like of the crushing system are not automatically detected and intelligently controlled, wherein the lining plate material consumption of the crusher in the crushing system, the roll surface abrasion and the consumption of the high-pressure roller mill are the main cost components of the crushing system, and the influence on the benefit of a concentrating mill is larger.
The applicant finds that the cyclic load is an important parameter for embodying closed-circuit operation of the crushing system, and directly reflects the operation efficiency of crushing equipment and screening equipment, and can indirectly embody the parameter change of the equipment, and mainly comprises that the ore discharge opening of the crusher is bigger, the screening equipment blocks sieve holes and the like. The entire crushing system can be intelligently controlled by using the cyclic load as a characterization parameter. At present, no related technology for intelligently controlling a crushing system by adopting a circulating load exists.
Disclosure of Invention
Based on the current state of control of the crushing system, the invention provides an intelligent control method of the crushing system based on process calculation, on-site instrument and meter detection and analysis by utilizing intelligent technology and big data analysis. The technical scheme adopted by the application is as follows:
a method of cyclic load based crushing system control, comprising:
step S1, obtaining a control cyclic load of a crushing system through a product granularity curve of a crusher in the crushing system and screening efficiency calculation of screening equipment, and determining a control cyclic load numerical range according to screening efficiency fluctuation caused by ore properties;
step S3, during the running process of the crushing system, acquiring weighing conveying quantity in real time through the feeding belt conveyer belt balance 4, the returning belt conveyer belt balance 8 and the final product belt conveyer belt balance 12, carrying out balance correction on the mineral quantity according to the weighing conveying quantity, and calculating through the weighing conveying quantity after the balance correction to acquire an actual circulating load;
and S4, according to the comparison of the actual circulating load and the control circulating load, adjusting ore discharge port parameters of the crusher, ore feeding quantity parameters of the crushing feeding equipment and the screening feeding equipment, and returning to the step S3 until the actual circulating load is within the numerical range of the control circulating load.
Optionally, the crusher comprises a medium crusher and a fine crusher.
Optionally, the balance correction of the ore quantity according to the weighing conveying quantity means:
the feeding amount is adjusted by the fine crushing feeding device 9, so that the weighing and conveying amount of the return belt conveyor belt balance 8 + the weighing and conveying amount of the final product belt conveyor belt balance 12 = the weighing and conveying amount of the ore feeding belt conveyor belt balance 4-formula 2 is realized.
Alternatively, correction balance means that the difference in values on both sides of the equal sign of equation 2 is within ±5%.
Optionally, in a three-section one-closed loop process, the control cyclic load calculation formula is as follows:
C S ＝(1-β 1 *E)/(β 5 * E) 100; equation 1
Wherein C is S Is a cyclic load of a three-section one-closed flow; e is the screening efficiency; beta 1 Is the percentage of the material content of the medium crushed product smaller than the mesh size; beta 5 Is the percentage of material content in the finely divided product that is smaller than the mesh size.
Optionally, after correction of the equilibrium, according to oversize material Q 4 Undersize material Q 3 The actual circulating load is calculated, Q3 is the weighing and conveying amount of the belt balance 12 of the belt conveyor of the final product, and Q4 is the weighing and conveying amount of the belt balance 8 of the return belt conveyor.
Optionally, adjusting ore delivery parameters of the crusher, the crushing feeder and the screening feeder according to the comparison of the actual cyclic load and the control cyclic load, including:
if the actual circulating load is lower than the lower limit of the circulating load control range, firstly, the ore discharge port of the crusher is enlarged; increasing the feeding amount of the screening equipment until the actual circulating load is within the control circulating load range under the condition that the ore discharge port is regulated to the maximum and the actual circulating load is still lower than the lower limit of the control circulating load range;
if the actual circulating load is higher than the upper limit of the circulating load control range, firstly reducing the ore discharge port of the crusher; in the case where the discharge opening is adjusted to a minimum, the actual cyclic load is still higher than the upper limit of the control cyclic load range, the screening apparatus feed is reduced until the actual cyclic load is within the control cyclic load range.
Optionally, in the crushing system, the extracted ore is conveyed to an ore bin, then the extracted ore is fed into a middle crushing crusher 2 for crushing through a middle crushing feeding device 1, the middle crushed product generated by the middle crushing crusher 2 is discharged to a feeding belt conveyor 3, the feeding belt conveyor 3 is used for conveying materials to a screening device 6 for screening, the oversize materials enter an on-screen return belt conveyor 7 and are fed into a fine crushing crusher 10 through a fine crushing feeding device 9 for fine crushing, the fine crushed product generated by the fine crushing crusher 10 and the middle crushed product generated by the middle crushing crusher 2 are combined and enter a follow-up operation through the feeding belt conveyor 3, the screening device 6, the on-screen return belt conveyor 7 and the fine crushing crusher 10 to form a closed circuit, and the undersize materials enter a final product belt conveyor 11.
Optionally, step S2 is further included after step S1, a product granularity curve of the crusher in the operation of the crushing system is collected, and a control cyclic load numerical range is recalculated and obtained in combination with the actual condition of screening efficiency.
The application has the following beneficial effects:
(1) In the closed-circuit crushing system, the circulating load is used as the control parameter of the crushing system to connect the crushing equipment, the screening equipment and the belt conveyor thereof, and the circulating load fluctuation analysis is used for indirectly reflecting the running state of the crushing system, so that the degree of automation is high, and the labor intensity of operators can be greatly reduced.
(2) By intelligent control, the process investigation work of the crushing system with large workload, manpower and material resource consumption is canceled and replaced, the real-time analysis of relevant parameters of the process investigation of the crushing system is realized, crushing and screening production loads are reasonably distributed, the crushing and screening efficiency is greatly improved, and the electricity consumption is controllable.
(3) According to the invention, through calculation and analysis of cyclic load and combination of system detection operation parameters, intelligent control of the crushing system is realized, and finally, the system control of optimal processing capacity, qualified product granularity, low energy consumption and reasonable service life of the lining plate of the crushing system is achieved.
(4) The invention can grasp the characteristic of ore crushability through long-term big data analysis and detection, and judge the property change of the ore according to the cyclic load condition, thereby reasonably adjusting the system capacity, prolonging or shortening the operation time of the crushing system and playing the maximum production energy efficiency.
Drawings
Fig. 1 is a schematic view of a crushing system according to an embodiment of the invention.
Fig. 2 is a flow chart of a method of controlling a cyclic load based crushing system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the embodiment, the control cyclic load is obtained through theoretical calculation and actual material detection, the weighing conveying quantity is obtained through a belt scale of a belt conveyor in actual production, and the actual cyclic load is obtained through calculation. The actual circulation load is compared with the control circulation load, and ore feeding quantity of crushing equipment and screening equipment is regulated by adjusting ore discharge port parameters, so that the stability is finally achieved. The system realizes the integral control of the crushing system, timely reflects the running state of the crushing system, realizes intelligent control, can greatly improve the system capacity and the operation rate, and simultaneously reduces the consumption of main materials of the lining plate, the roller surface and the screen plate.
The crushing system based on the cyclic load of the present embodiment includes a medium crushing feeder 1 (belt feeder or vibratory feeder), a medium crushing crusher 2 (cone crusher or other crusher), a feeding belt conveyor 3, a feeding belt conveyor belt scale 4 (electronic belt scale or nucleon scale), a screening feeder 5 (belt feeder or vibratory feeder), a screening device 6 (circular vibratory screen or linear vibratory screen, etc.), an on-screen return belt conveyor 7, a return belt conveyor belt scale 8 (electronic belt scale or nucleon scale), a fine crushing feeder 9 (belt feeder or vibratory feeder), a fine crushing crusher 10 (cone crusher or high pressure roller mill), a final product belt conveyor 11, and a final product belt conveyor belt scale 12 (electronic belt scale or nucleon scale). The crushing equipment of the crushing system can be cone crushers, hammer crushers, impact crushers, high-pressure roller mills and other equipment, and the screening equipment can be a circular vibrating screen, a linear vibrating screen, a banana vibrating screen and the like.
The ore is conveyed to an ore bin in a mining field, then the ore is fed into a middle crushing crusher 2 through a middle crushing feeding device 1 for crushing, the middle crushed product generated by the middle crushing crusher 2 is discharged to a feeding belt conveyor 3, the feeding belt conveyor 3 conveys materials to enter a pre-screening buffer ore bin, then the screening feeding device 5 feeds the materials to a screening device 6 for screening, the oversize materials enter an on-screen return belt conveyor 7 and return to the pre-fine crushing buffer ore bin, the finely crushed materials are fed into a fine crushing crusher 10 through a fine crushing feeding device 9 for fine crushing, and the fine crushed product generated by the fine crushing crusher 10 and the middle crushed product generated by the middle crushing crusher 2 are combined and enter a follow-up operation through the feeding belt conveyor 3, and the feeding belt conveyor 3, the screening device 6, the on-screen return belt conveyor 7 and the fine crushing crusher 10 form the ore crushing machine. The undersize material enters a final product belt conveyor 11 for conveying to ore grinding operations. Belt scales 4, 8 and 12 are respectively arranged on the ore feeding belt conveyor 3, the return belt conveyor 7 and the final product belt conveyor 11 to weigh to obtain real-time conveying quantity, and real-time circulating load values are obtained through calculation.
The crushing system control method based on the cyclic load comprises the following steps:
step S1, obtaining a control cyclic load of a crushing system through product granularity curves of a medium crushing crusher 2 and a fine crushing crusher 10 in the crushing system and screening efficiency calculation of a screening device 6, and determining a numerical range of the control cyclic load according to a planned production fluctuation condition (mainly referred to as fluctuation of the screening efficiency caused by materials);
for example: the flow chart is shown in fig. 2, and the calculation formula of the control cyclic load is as follows:
C S ＝Q 5 /Q 1 ＝(1-β 1 *E)/(β 5 * E) 100; equation 1
Wherein Cs is the control cyclic load of a three-section one-closed flow; q1 is a medium crushing product; q2 is the screened feed; q3 is undersize material; q4 is oversize material; q5 is a finely divided product; e is the screening efficiency, generally 80% -90%; β1 is the percentage of material content in the medium size product that is smaller than the mesh size; beta 5 is the percentage of material content in the finely divided product that is smaller than the mesh size.
Crushing and screening are carried out by adopting a three-section one-closed-circuit process in a copper ore dressing plant, wherein a standard cone crusher for the American-tall and tall is adopted for the middle crushing, and a CSS=38mm of a middle crushing ore discharge port; a short-head cone crusher of the mepiquat chloride is selected for fine crushing, and a fine crushing ore discharging port CSS=16mm; the granularity of the three-section one-closed-circuit final screening sieve mesh is controlled to be 12mm. Firstly, verifying that the content of-12 mm is 16% according to a particle size curve obtained by CSS=38mm of a middle crushed ore discharge port of a sample of the android crusher; the particle size curve obtained for the fine discharge opening css=16 mm verified that the-12 mm content was 63%. Obtaining a size fraction content value below a sieve mesh according to a sample theory, and calculating to obtain a cyclic load of 173.02% when the screening efficiency E=80% according to a formula 1; when the screening efficiency e=90%, the calculation obtained the cyclic load was 150.97%.
Through the theoretical calculation, the fluctuation of screening efficiency caused by ore property and other factor changes is considered, and the calculated control cyclic load, namely the control cyclic load of three-section one-closed control of a copper mine, is 150.97% -173.02%.
And S2, carrying out product granularity detection of each operation section according to the running condition of the crushing system and combining the characteristics of ores to obtain a product granularity curve, and recalculating to obtain a control cyclic load numerical range by combining the actual condition of screening efficiency. The more realistic control loop load obtained in step S2 can be used to mutually verify with the control loop load of step S1 to ensure the accuracy of the control loop load, but is not required.
Step S3, in the production process, weighing and conveying quantity is obtained in real time through a belt scale 4 on the ore feeding belt conveyor 3, a belt scale 8 on the screen return belt conveyor 7 and a belt scale 12 on the final product belt conveyor 11, balance correction of ore quantity is carried out according to the weighing and conveying quantity, and actual circulating load is obtained through calculation of the weighing and conveying quantity on the basis of correction balance;
balance correction of ore quantity based on weighing delivery, e.g. three-stage-closed-circuit copper ore according to the above example, screening ore feed Q 2 ＝Q 3 +Q 4 From the theoretical point of view, the balance can be realized after the production is stable. The corresponding steps are as follows:
the weighing conveyance amount of the belt scale 8 on the return-on-screen belt conveyor 7+the weighing conveyance amount of the belt scale 12 on the final product belt conveyor 11=the weighing conveyance amount of the belt scale 4 on the ore feeding belt conveyor 3. Equation 2
If the balance is not achieved, the fine adjustment of the feeding amount can be achieved by the fine adjustment of the feeding device 9 under the buffer bin, and the balance requirement can be within + -5% of the numerical difference between the two sides of the formula 2.
Based on correction balance, for a three-section one-closed-loop flow, according to C S ＝Q 5 /Q 1 The actual cyclic load is calculated, wherein after the balance is corrected, q1=q3, q4=q5, Q3 is the weighing conveyance amount of the belt scale 12 on the final product belt conveyor 11, and Q4 is the weighing conveyance amount of the belt scale 8 on the return-on-screen belt conveyor 7.
And S4, comparing and analyzing the actual circulating load with the control circulating load, adjusting the parameters such as the ore discharging opening of the medium crushing machine 2, the ore discharging opening of the fine crushing machine 10, the ore feeding amount of the medium crushing feeding equipment 1, the screening feeding equipment 5 and the fine crushing feeding equipment 9, and returning to the step S3 to calculate the actual circulating load again for comparing and analyzing the actual circulating load with the control circulating load, so that the actual circulating load is finally realized within the control range of the control circulating load, and the crushing system is stably and efficiently operated.
Specifically, expert analysis and fuzzy control may be used to develop control logic, and parameter adjustment may be performed according to the control logic, including:
(1) Expert experience is compiled into fuzzy rules, wherein,
the actual cyclic load is compared to the control cyclic load, for example, the following (not all) cases may occur:
input: the actual cyclic load is lower than the lower limit of the control cyclic load range;
the actual cyclic load is higher than the upper limit of the control cyclic load range;
and (3) outputting: the actual cyclic load is below the lower limit of the control cyclic load range, the analytical reasons may be: the ore discharge port of the crusher is too small, so that the granularity is thinned; the ore properties become soft, resulting in finer particle sizes.
Control logic and strategy are determined in conjunction with the above analysis: firstly, the ore discharge port of the crusher is controlled and adjusted intelligently preferentially, and the ore discharge port should be enlarged because the site is low in cyclic load; when the circulation load is still low and cannot be adjusted, a second measure is started to adjust the feeding amount of the screening device, and the feeding amount is increased due to the low circulation load until the actual circulation load is within the control circulation load range.
The actual cyclic load is higher than the upper limit of the control cyclic load range, the analytical reasons may be: the ore discharge port of the crusher becomes large due to abrasion, so that the granularity becomes coarse; hardening ore properties, resulting in coarser particle sizes; the clogging of the screen holes results in coarser particle sizes.
Control logic and strategy are determined in conjunction with the above analysis: firstly, the ore discharge port of the crusher is controlled and adjusted intelligently preferentially, and the ore discharge port should be adjusted to be smaller because the site is high in cyclic load; when the adjustment is impossible; the cyclic load is still high, the second measure is started, the feeding amount of the screening device is adjusted, and the feeding amount is reduced due to the high cyclic load until the actual cyclic load is within the range of the control cyclic load.
(2) Blurring the actual cyclic load (or the result of comparing the actual cyclic load with the control cyclic load);
(3) And taking the blurred actual cyclic load (or the comparison result of the blurred actual cyclic load and the control cyclic load) as the input of a blurring rule, thereby obtaining the output quantity according to the blurring rule.
In summary, the method combines the project ore properties and the parameter analysis of the equipment to form a whole set of expert control logic, adopts a fuzzy control algorithm to judge, and finally realizes the stable control of the actual cyclic load in the control cyclic load range. The fuzzy control algorithm is only an example, and the present application is not limited to adopting other algorithms to determine and output the parameter adjustment amount. For example, the degree to which the actual cyclic load is lower than the lower limit of the controlled cyclic load range may be correlated with the step length to which the ore discharge port is increased and the step length to which the ore feeding amount is increased, the degree to which the actual cyclic load is higher than the upper limit of the controlled cyclic load range may be correlated with the step length to which the ore discharge port is decreased and the step length to which the ore feeding amount is reduced, and the actual cyclic load may be controlled within the controlled cyclic load range by stepwise adjustment.
Of course, the present invention is capable of other various embodiments and its several details are capable of modification in accordance with the present invention by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A method of controlling a crushing system based on cyclic loading, comprising:
step S1, obtaining a control cyclic load of a crushing system through a product granularity curve of a crusher in the crushing system and screening efficiency calculation of screening equipment, and determining a control cyclic load numerical range according to screening efficiency fluctuation caused by ore properties;
step S3, in the running process of the crushing system, weighing and conveying quantity is obtained in real time through a feeding belt conveyor belt balance (4), a returning belt conveyor belt balance (8) and a final product belt conveyor belt balance (12), balance correction of the ore quantity is carried out according to the weighing and conveying quantity, and after balance correction, the actual circulating load is obtained through calculation of the weighing and conveying quantity;
and S4, according to the comparison of the actual circulating load and the control circulating load, adjusting ore discharge port parameters of the crusher, ore feeding quantity parameters of the crushing feeding equipment and the screening feeding equipment, and returning to the step S3 until the actual circulating load is within the numerical range of the control circulating load.
2. The cyclic load based crushing system control method of claim 1 wherein the crushers include medium crushing crushers and fine crushing crushers.
3. The method according to claim 2, wherein the balance correction of the ore quantity according to the weighed conveying amount means:
the fine crushing feeding equipment (9) is used for adjusting the feeding quantity, so that the weighing and conveying quantity of the belt balance (8) of the return belt conveyor, the weighing and conveying quantity of the belt balance (12) of the belt conveyor of the final product, the weighing and conveying quantity of the belt balance (4) of the ore feeding belt conveyor are achieved, and the formula 2 is shown.
4. A method of controlling a cyclic load based crushing system according to claim 3, wherein the correction balance means that the difference between the numbers on both sides of the equal sign of equation 2 is within ±5%.
5. The method according to claim 2, wherein the calculation formula of the cyclic load is as follows in a three-stage closed-circuit process:
C S ＝(1-β 1 *E)/(β 5 * E) 100; equation 1
Wherein C is S Is a cyclic load of a three-section one-closed flow; e is the screening efficiency; beta 1 Is the percentage of the material content of the medium crushed product smaller than the mesh size; beta 5 Is the percentage of material content in the finely divided product that is smaller than the mesh size.
6. The method according to claim 1, characterized in that after the correction of the equilibrium, the crushed material Q is treated as oversize material 4 Undersize material Q 3 The actual circulating load is calculated, Q3 is the weighing and conveying quantity of the belt balance (12) of the belt conveyor of the final product, and Q4 is the weighing and conveying quantity of the belt balance (8) of the return belt conveyor.
7. The method of claim 1, wherein adjusting the ore discharge parameters of the crusher, the ore feed parameters of the crushing feeder and the screening feeder based on a comparison of the actual cyclic load and the control cyclic load comprises:
if the actual circulating load is lower than the lower limit of the circulating load control range, firstly, the ore discharge port of the crusher is enlarged; increasing the feeding amount of the screening equipment until the actual circulating load is within the control circulating load range under the condition that the ore discharge port is regulated to the maximum and the actual circulating load is still lower than the lower limit of the control circulating load range;
if the actual circulating load is higher than the upper limit of the circulating load control range, firstly reducing the ore discharge port of the crusher; in the case where the discharge opening is adjusted to a minimum, the actual cyclic load is still higher than the upper limit of the control cyclic load range, the screening apparatus feed is reduced until the actual cyclic load is within the control cyclic load range.
8. The cyclic load-based crushing system control method according to claim 2, wherein in the crushing system, the extracted ore is conveyed to an ore bin, then the extracted ore is fed into the intermediate crusher (2) for crushing through the intermediate crusher feeding device (1), the intermediate crushed product generated by the intermediate crusher (2) is discharged to the ore feeding belt conveyor (3), the ore feeding belt conveyor (3) conveys the material to the screening device (6) for screening, the oversize material enters the on-screen return belt conveyor (7) and is fed into the fine crusher (10) through the fine crusher feeding device (9), the fine crushed product generated by the fine crusher (10) and the intermediate crushed product generated by the intermediate crusher (2) are combined and enter the subsequent operation through the ore feeding belt conveyor (3), the screening device (6), the on-screen return belt conveyor (7) and the fine crusher (10) form a closed circuit, and the undersize material enters the final product belt conveyor (11).
9. The method according to claim 1, further comprising step S2 after step S1, collecting a product particle size curve of a crusher in operation of the crushing system, and recalculating to obtain a control cyclic load value range in combination with actual conditions of screening efficiency.
Priority Applications (1)
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