CN113058730B - Closed-circuit control system and method for high-pressure roller grinding before magnetite grinding - Google Patents
Closed-circuit control system and method for high-pressure roller grinding before magnetite grinding Download PDFInfo
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- CN113058730B CN113058730B CN202110325577.XA CN202110325577A CN113058730B CN 113058730 B CN113058730 B CN 113058730B CN 202110325577 A CN202110325577 A CN 202110325577A CN 113058730 B CN113058730 B CN 113058730B
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- 238000000227 grinding Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 50
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 310
- 238000012216 screening Methods 0.000 claims abstract description 135
- 238000007885 magnetic separation Methods 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 57
- 229910052742 iron Inorganic materials 0.000 claims description 32
- 230000003139 buffering effect Effects 0.000 claims description 23
- 230000002441 reversible effect Effects 0.000 claims description 20
- 238000009826 distribution Methods 0.000 claims description 17
- 230000009471 action Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002184 metal Substances 0.000 description 13
- 229910052751 metal Inorganic materials 0.000 description 13
- 238000012423 maintenance Methods 0.000 description 12
- 238000003860 storage Methods 0.000 description 8
- 238000007599 discharging Methods 0.000 description 7
- 238000005065 mining Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
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- 230000036541 health Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The invention provides a closed-circuit control system and a closed-circuit control method for high-pressure roller grinding before magnetite grinding, which belong to the technical field of ore dressing, wherein the method comprises the steps of carrying out screening operation by arranging a plurality of high-pressure roller grinding units and a plurality of vibrating units, accurately controlling the high-pressure roller grinding units and the vibrating units by a control system to obtain oversize materials and undersize materials, taking the oversize materials as return materials through a return belt conveyor, and enabling the undersize materials to enter a magnetic separation process; the invention improves the automation degree of the whole high-pressure roller mill closed-circuit screening system, reduces the manual control link, and realizes the technical effect of accurate control of the production progress under the condition of saving human resources.
Description
Technical Field
The invention relates to the technical field of mineral separation, in particular to a closed-circuit control system and method for high-pressure roller grinding before magnetite grinding.
Background
Before magnetite is subjected to magnetic separation, the magnetite is crushed by a high-pressure roller mill to reduce the energy consumption of the ore grinding operation at the lower stage. The granularity of the product is enabled to be below 3mm-6mm through a high-pressure roller grinding-closed-circuit screening process, then the product obtained through screening is subjected to large-granularity wet magnetic separation, and finally the tail flicking can reach 30% -40%; by improving the tail flick rate, the technical effects of greatly reducing the energy consumption and the production and operation cost of the subsequent grinding and selecting system are achieved.
The existing control of the high-pressure roller grinding-closed-circuit screening process comprises the control of the material level of a mineral bin, the control of the movement of a mine leakage car, the control of the full feeding of the high-pressure roller grinding, the control of the iron passing protection of the high-pressure roller grinding and the maintenance control of related equipment; the control system has the following defects that all the post workers at all the positions control the operation according to production experience:
1. the operation level of the post worker influences the control level of the high-pressure grinding-closed-circuit screening process, and the condition of human misoperation often occurs;
2. each link needs a post worker to finish control operation, so that labor cost is greatly increased, noise and dust of an operation site environment cause health injury to the post worker.
Therefore, a closed-circuit control method for the high-pressure roller grinding before magnetite grinding, which has high automation degree, is needed.
Disclosure of Invention
The invention aims to provide a closed-circuit control system and a closed-circuit control method for high-pressure roller grinding before magnetite grinding, and the automatic and efficient operation of the whole production line is realized by arranging a plurality of high-pressure roller grinding units and a plurality of vibration units when a single high-pressure roller grinding machine is stopped for maintenance or a single vibration screen is stopped for maintenance.
In order to achieve the above purpose, the invention provides a closed-circuit control method for high-pressure roller grinding before magnetite grinding, which comprises the following steps: feeding the new material formed by the vibration feeder and the returned material conveyed by the returned belt conveyor into a first belt conveyor provided with a first mine leakage car;
The first material is sent into X high-pressure roller grinding units for crushing operation to form crushed materials; the high-pressure roller mill unit comprises a high-pressure roller mill feeding buffer bin, a high-pressure roller mill feeding belt conveyor and a high-pressure roller mill which are correspondingly arranged; the material self-leaking mine car I is sent into a high-pressure roller mill feeding buffer bin and is sent into the high-pressure roller mill for crushing through a high-pressure roller mill feeding belt conveyor; x is more than or equal to 3, and X is an integer;
feeding crushed materials into a second belt conveyor provided with a second mine leakage car;
the second ore leakage car sends the crushed materials into Y vibrating units for screening operation to obtain oversize materials and undersize materials, the oversize materials are taken as return materials through a return belt conveyor, and the undersize materials enter a magnetic separation process; the vibrating unit comprises a screening buffer bin, a screening feeding belt conveyor and a vibrating screen which are correspondingly arranged; the crushed material is sent into a screening buffer bin from a second leaking mine car, and is sent into a vibrating screen for screening through a screening feeding belt conveyor, wherein Y is more than or equal to 6, and Y is an integer.
Further, preferably, in the step of feeding the material from the leaky mine car into the high-pressure roller mill feeding buffer bin, the method further comprises:
detecting the material level of the high-pressure roller mill feeding buffer bin, if a certain high-pressure roller mill feeding buffer bin carries out low material level alarm, distributing the material of the pair of high-pressure roller mill feeding buffer bins by the mine leakage car until the high-pressure roller mill feeding buffer bin carries out high material level alarm, and completing the material distribution operation of the high-pressure roller mill feeding buffer bin by the mine leakage car;
When all high-pressure grinding feeding buffering bins perform low material level alarming, the starting-up quantity of the vibrating feeder is increased to increase the feeding quantity;
when all high-pressure roller mill feeding buffering bins carry out high material level alarming, the starting-up quantity of the vibrating feeder is reduced to reduce the feeding quantity.
Further, preferably, the step of feeding the crushed material from the second leaky mine car into the screening and buffering bin further comprises:
the second mine leakage vehicle is used for distributing the screening feeding buffer bin in a reciprocating and circulating mode one by one according to the setting sequence; detecting the material level of the screening feeding buffer bin;
if a certain screening feeding buffer bin carries out low material level alarm, a second mine leakage car carries out material distribution on the screening feeding buffer bin;
if a certain screening feeding buffer bin carries out high material level alarm, stopping distributing the screening feeding buffer bin by a second mine leakage car;
when all screening feeding buffer bins perform low material level alarming, the interlocking high-pressure roller mill feeding belt conveyor accelerates to increase the feeding amount;
when all screening feeding buffer bins carry out high material level alarming, the linked high-pressure roller mill feeding belt conveyor decelerates to reduce the feeding amount.
Further, preferably, in the step of crushing by feeding the material into the high-pressure roller mill via the high-pressure roller mill feed belt conveyor, the high-pressure roller mill feed belt conveyor feeds the material into the high-pressure roller mill via the high-pressure roller mill hopper, the method comprising:
When the high-pressure roller mill hopper gives an alarm on the high material level of the high-pressure roller mill hopper, the corresponding high-pressure roller mill feeding belt conveyor is interlocked to decelerate;
when the high-pressure roller mill hopper gives an alarm of the low material level of the high-pressure roller mill hopper, the corresponding high-pressure roller mill feeding belt conveyor is interlocked to accelerate.
Further, preferably, when all screening feeding buffer bins perform low material level alarm and the high-pressure roller mill hopper simultaneously performs high material level alarm, the high-pressure roller mill feeding belt conveyor is preferentially linked to accelerate;
when all screening feeding buffering bins perform high material level alarming, and the high-pressure roller mill feeding hopper simultaneously performs low material level alarming, the high-pressure roller mill feeding belt conveyor is preferentially linked to slow down.
Further, it is preferable that the inclination angle of the high-pressure grinding feeding surge bin and the screening feeding surge bin is equal to 70 degrees, and the high-pressure grinding feeding surge bin and the screening feeding surge bin are square table type with large upper part and small lower part.
Further, preferably, in the step of feeding the material from the leaky mine car into the high-pressure roller mill feeding buffer bin and feeding the material into the high-pressure roller mill for crushing by the high-pressure roller mill feeding belt conveyor, the method further comprises:
according to whether an iron device exists on the high-pressure roller mill feeding belt conveyor, adjusting the action of a plow-type unloading machine arranged in the conveying direction of the high-pressure roller mill feeding belt conveyor so as to remove the iron device in the material on the high-pressure roller mill feeding belt conveyor; wherein,
When iron devices are detected in materials on the high-pressure roller mill feeding belt conveyor, triggering the plow-type unloading machine to press the high-pressure roller mill feeding belt conveyor, and enabling the iron devices on the high-pressure roller mill feeding belt conveyor to enter the receiving hopper through a discharge port of the plow-type unloading machine; when the ironware gets into and connects the hopper, trigger plow discharge machine and break away from high-pressure roller mill feed belt conveyor.
Further, preferably, in the step of forming the new material by the vibratory feeder, the method further comprises:
conveying raw ore to a raw ore bin through a long-distance belt conveyor, and detecting the raw ore level of the raw ore bin;
when the raw ore material level exceeds the preset high material level of the raw ore, carrying out high material level alarm of the raw ore bin, and stopping the chain long-distance belt conveyor;
when the raw ore material level exceeds the preset low material level of the raw ore, the low material level alarm of the raw ore bin is carried out, and the chain long-distance belt conveyor is started.
Further, preferably, when the high-pressure roller mill feeding belt conveyor needs to be overhauled, the discharge hopper gate valve of the corresponding high-pressure roller mill feeding buffer bin is closed in a linkage mode.
The invention also comprises a closed-circuit control system for the high-pressure roller grinding before magnetite grinding, which comprises a material conveying unit, a material crushing unit, a material screening unit and a control unit;
The material conveying unit is used for feeding the new material formed by the vibrating feeder and the returned material conveyed by the returned material belt conveyor into the belt conveyor I provided with the first mine leakage car;
the material crushing unit is used for conveying the first material of the mining car into the X high-pressure roller grinding units for crushing operation to form crushed materials; the high-pressure roller mill unit comprises a high-pressure roller mill feeding buffer bin, a high-pressure roller mill feeding belt conveyor and a high-pressure roller mill which are correspondingly arranged; the material self-leaking mine car I is sent into a high-pressure roller mill feeding buffer bin and is sent into the high-pressure roller mill for crushing through a high-pressure roller mill feeding belt conveyor; x is more than or equal to 3, and X is an integer;
the material screening unit is used for feeding the crushed materials into a second belt conveyor provided with a second mine leakage car; the second ore leakage car sends the crushed materials into Y vibrating units for screening operation to obtain oversize materials and undersize materials, the oversize materials are taken as return materials through a return belt conveyor, and the undersize materials enter a magnetic separation process; the vibrating unit comprises a screening buffer bin, a screening feeding belt conveyor and a vibrating screen which are correspondingly arranged; the crushed material self-leaking mine car II is sent into a screening buffer bin, and is sent into a vibrating screen for screening through a screening feeding belt conveyor, wherein Y is more than or equal to 6, and Y is an integer;
And the control unit is used for controlling the material conveying unit, the material crushing unit and the material screening unit.
As described above, the closed-circuit control system and method for the high-pressure roller grinding before magnetite grinding have the following beneficial effects:
1. by setting the number and control mode of the high-pressure roller mill and the vibrating screen, the production of the whole system is orderly carried out during the shutdown maintenance period of the high-pressure roller mill and the vibrating screen, and the production progress of the whole assembly line is further ensured;
2. the reversible motor linkage of the single bin alarm and the mine leakage vehicle is adopted, and the mode of the full bin alarm and the start-stop linkage of the vibrating feeder at the lower part of the raw ore bin is adopted, so that the high-level alarm or low-level alarm condition of a multi-ore bin of the high-pressure roller grinding system is solved; the multi-bin alarm system realizes the hierarchical processing of multi-bin alarm, and realizes the purposes that the operation variables of single-stage control are unique and the variables are different from each other, so that the operation conflict of multi-head control is avoided, and the overall working efficiency is further improved.
3. The automation degree of the whole high-pressure roller mill closed-circuit screening system is improved, the manual control link is reduced, and the accurate control of the production progress is realized under the condition of saving human resources.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Furthermore, the invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and readily appreciated by reference to the following description and claims in conjunction with the accompanying drawings and a more complete understanding of the invention. In the drawings:
fig. 1 is a schematic view of a scene of a closed-circuit control method for a high-pressure roller mill before magnetite grinding according to an embodiment of the invention.
wherein ,
10. a raw ore bin; 101. a raw ore bin level gauge; 11. a long-distance belt conveyor; 12. a new feed belt conveyor; 13. a vibratory feeder; 20. a first belt conveyor; 21. a first mine leakage vehicle; 211. a reversible motor for the mine car; 212. a leakage mine car proximity switch; 213. a position sensor of the mine leakage vehicle; 31. a high-pressure roller mill feeding buffer bin; 311. high-pressure roller mill feeding buffering bin discharging hopper; 312. a high-pressure roller mill feeding buffering bin level gauge; 313. a discharge hopper gate valve of a high-pressure roller mill feeding buffer bin; 32. a high-pressure roller mill feeding belt conveyor; 321. a motor of a high-pressure roller mill feeding belt conveyor; 33. high-pressure roller mill; 331. a high pressure roller mill hopper; 332. a hopper manometer of the high-pressure roller mill; 34. a belt conveyor III; 40. a second mine leakage vehicle; 401. a second reversible motor of the mine leakage vehicle; 41. a belt conveyor II; 50. a return belt conveyor; 51. screening a buffer bin; 511. screening a buffer bin discharge hopper; 52. a screening feed belt conveyor; 53. a vibrating screen; 512. screening buffering bin level gauge; 61. plow discharger; 62. a first metal detector; 63. a second metal detector; 64. a plow discharger motor; 71. a pump; 72. and (5) a pump pool.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
The high-pressure roller mill closed-circuit screening system is characterized in that new material formed by a vibrating feeder and return material conveyed by a return belt conveyor are fed into the belt conveyor provided with a mine leakage car; the material is sent into a high-pressure roller mill by the mine leakage car for crushing operation, so as to form crushed material; feeding crushed materials into a belt conveyor provided with a mine leakage car; the mine leakage car sends the crushed materials into a vibrating screen for screening operation to obtain oversize materials and undersize materials, the oversize materials are taken as returned materials through a returned material belt conveyor, and the undersize materials enter a magnetic separation operation flow.
According to the closed-circuit control system and method for the high-pressure roller mill before magnetite milling, the number and control mode of the high-pressure roller mill and the vibrating screen are set, so that the whole system production is orderly carried out during the shutdown maintenance period of the high-pressure roller mill and the vibrating screen, and the production progress of the whole assembly line is further ensured; the reversible motor linkage of the single bin alarm and the mine leakage vehicle is adopted, and the mode of the full bin alarm and the start-stop linkage of the vibrating feeder at the lower part of the raw ore bin is adopted, so that the problem of high material level alarm or low material level alarm in multiple ore bins is solved; the multi-bin alarm system realizes the hierarchical processing of multi-bin alarm, and realizes the purposes that the operation variables of single-stage control are unique and the variables are different from each other, so that the operation conflict of multi-head control is avoided, and the overall working efficiency is further improved. The automation degree of the whole high-pressure roller mill closed-circuit screening system is improved, the manual control link is reduced, and the accurate control of the production progress is realized under the condition of saving human resources.
Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 illustrates a general description of a scenario of a closed-loop control method for a high-pressure roller mill prior to magnetite milling. Specifically, fig. 1 is a schematic view of a scenario of a closed-loop control method for a high-pressure roller mill before magnetite grinding according to an embodiment of the present invention; as shown in FIG. 1, the closed-loop control method for the high-pressure roller grinding before magnetite grinding comprises steps S1-S4.
S1, feeding new material formed by the vibration feeder 13 and returned material conveyed by the returned material belt conveyor 50 into a belt conveyor one 20 provided with a first leakage mine car 21.
Raw ore is fed into the raw ore bin 10 from a raw ore storage yard through a long-distance belt conveyor 11, and materials are fed into a new feeding belt conveyor 12 of a high-pressure roller mill workshop through a vibrating feeder 13 at the bottom of the raw ore bin 10. The new feed belt conveyor 12 conveys new material and return material conveyed by the return belt conveyor 50 is fed together to the first belt conveyor 20 with the first hopper car 21 disposed above.
It should be noted that, according to the mineral yield in the practical application scenario, the number of the vibration feeders may be 4-6, and in this embodiment, 4 vibration feeders are taken as an example.
As an improvement of the embodiment, in the step of forming new material by the vibration feeder, the method for automatically adjusting the raw ore bin capacity is further included: the raw ore is conveyed to the raw ore bin 10 by a long-distance belt conveyor 11, and the raw ore level of the raw ore bin 10 is detected; when the raw ore material level exceeds the preset high material level of the raw ore, the high material level of the raw ore bin is alarmed, and the chain long-distance belt conveyor 11 is stopped; when the raw ore level exceeds the preset low raw ore level, the low raw ore bin level alarm is carried out, and the chain long-distance belt conveyor 11 is started.
Specifically, the automatic capacity adjustment of the raw ore bin is realized through a raw ore bin capacity control module of a control system, and the raw ore bin capacity control module comprises a raw ore bin level gauge 101 arranged at the top of the raw ore bin 10 and a long-distance belt conveyor 11 which are in common linkage. Wherein the feeding amount of the long-distance belt conveyor 11 is set to be 1.1-1.2 times of the feeding amount of the new feeding belt conveyor 12, and the raw ore bin high level and the raw ore bin low level alarm are set. The concrete control mode is that when the raw ore bin material level detection is in a high material level, high material level alarm is carried out, and the long-distance belt conveyor 11 is stopped in a linkage way. When the raw ore bin level detection is at a low level, a low level alarm is carried out, and the long-distance belt conveyor 11 is started in a chain manner.
In short, the raw ore bin capacity control module formed by the raw ore bin level gauge 101 and the long-distance belt conveyor 11 keeps the conveying capacity of the long-distance belt conveyor 11 high as the discharging capacity of the Yu Yuankuang bin 10, and the control mode is simple and effective only by adjusting the starting and stopping of the long-distance belt conveyor 11 through the level of the raw ore bin 10.
S2, the first mining car 21 sends the material into X high-pressure roller grinding units for crushing operation to form crushed materials; the high-pressure roller mill unit comprises a high-pressure roller mill feeding buffer bin 31, a high-pressure roller mill feeding belt conveyor 32 and a high-pressure roller mill 33 which are correspondingly arranged; the material self-leaking mine car I21 is sent into a high-pressure roller mill feeding buffer bin 31, and is sent into a high-pressure roller mill 33 for crushing through a high-pressure roller mill feeding belt conveyor 32; x is more than or equal to 3, and X is an integer. In the practical implementation process, the design number X of the high-pressure grinding units is 3-5.
Specifically, the materials are fed into the high-pressure roller mill feeding belt conveyor 32 through the discharge hopper 311 at the lower part of the high-pressure roller mill feeding buffer bin 31, then automatically flow into the high-pressure roller mill 33 after being fed into the high-pressure roller mill feeding hopper 331, and all the products after being crushed by the high-pressure roller mill 33 are fed into the belt conveyor III 34 and transferred to a screening workshop. Each high-pressure roller mill is provided with the same buffer bin, and the structure of the buffer bin is a square table with the inclination angle of 70 degrees and the upper part and the lower part of the buffer bin are small. The large-inclination ore bin can ensure the flow of the high-pressure roller mill product below 3-6mm, and stop the blockage of the ore bin.
In order to realize continuous operation of the assembly line, a plurality of high-pressure grinding units are simultaneously arranged, the number of the high-pressure grinding units is adjusted according to the actual production value in the application scene, and in this embodiment, 3 high-pressure grinding units are taken as an example. Wherein, 3 high-pressure roller mills include a reserve high-pressure roller mill, and every high-pressure roller mill corresponds to set up high-pressure roller mill feed belt conveyor 32 and high-pressure roller mill feed surge bin 31.
The number of the 3 high-pressure roller mills is 2 to 1. Because each high-pressure roller mill needs to carry out roller nail maintenance operation every day, the maintenance time is about 2-3 hours, and the time-division roller nail maintenance of 3 high-pressure roller mills can be realized by adopting a high-pressure roller mill system with 2 work and 1 equipment, the operation rate consistency of a high-pressure roller mill ring joint and a later mill selection link is realized, and the productivity of the whole system is ensured.
The 3 high-pressure roller mill feeding surge bins 31 are distributed by the first hopper car 21. The concrete material distribution mode is that when a certain high-pressure roller mill feeding buffer bin 31 carries out low material level alarming, the first mine leakage car 21 walks to the high-pressure roller mill feeding buffer bin 31, and after the high-pressure roller mill feeding buffer bin 31 is unloaded to a high material level, the high material level alarming is excited, and the first mine leakage car 21 leaves the bin.
When the middle high-pressure roller mill 33 is stopped for maintenance, namely the middle high-pressure roller mill feeding buffer bin 31 is standby, the material distribution of the two side ore bins must be switched to pass through the middle bin, and the middle bin can only be forced to receive the material, which is the most unfavorable condition of the material distribution of the ore bins. The distribution switching conditions that the single bin is used for fixed-point distribution for a long time until the single bin is fully distributed or the single bin is used for fixed-point discharge until the single bin is obliquely empty are adopted, so that the number of times that the mine car which is taken as a material distribution vehicle passes through the intermediate buffer bin is reduced to the greatest extent. Thereby prolonging the storage time of the intermediate buffer bin to the maximum extent at the source.
Assuming that the first leaky car 21 only distributes material to a single high-pressure grinding feed buffer bin 31 (only feeds and does not discharge material at the moment), the time required for the high-pressure grinding feed buffer bin 31 to be distributed from the empty bin to full storage is t 1a Hours. When the high-pressure roller mills at the two sides work and the middle high-pressure roller mill is stopped, the time required for the buffer bin of the high-pressure roller mill at the two sides to be fully stored from the empty bin is 2t 1a The time required for the mine leakage car to pass through the top of the feeding buffer bin of the middle high-pressure roller mill is t 2a The feeding buffer bin of the middle high-pressure roller mill is fully stored under the working stateNumber of times n=t 1a /t 2a The time required for full storage of the feeding buffer bin of the middle high-pressure roller mill is t 3a ＝2t 1a ×(t 1a /t 2a )。
And the full storage time t of the feeding buffer bin of the middle high-pressure roller mill 3a The time is set to be 12-18 hours, and the time meets the requirement of 12 hours of the longest overhaul time of the most unfavorable overhaul of the high-pressure roller mill (the high-pressure roller mill changes the grinding roller). And pass through t 3a The time required for the leaky mine car to pass through the top of the feeding buffer bin of the middle high-pressure roller mill is t 2a The effective volume storable t of the single high-pressure roller mill feeding buffer bin can be finally determined 1a Hours of material. When t 3a The effective volume of a single high-pressure grinding feeding buffer bin with the value of 12-18 hours can store t 1a Hours of material.
As an improvement of this embodiment, the step of feeding the material from the first leaky mine car 21 into the high pressure grinding feed buffer bin 31 further includes: detecting the material level of the high-pressure roller mill feeding buffer bin 31, and if a certain high-pressure roller mill feeding buffer bin carries out low material level alarm, distributing the high-pressure roller mill feeding buffer bin 31 by the first mine leakage vehicle 21 until the high-pressure roller mill feeding buffer bin 31 carries out high material level alarm, and distributing the high-pressure roller mill feeding buffer bin 31 by the first mine leakage vehicle 21; when all the high-pressure grinding feeding buffer bins 31 carry out low material level alarming, the starting-up quantity of the vibrating feeder 13 is increased to increase the feeding quantity; when all the high-pressure grinding feeding buffer bins 31 perform high material level alarming, the starting-up quantity of the vibrating feeder 13 is reduced to reduce the feeding quantity.
It should be noted that, the material level alarm of the high-pressure roller mill feeding surge bin is realized by a high-pressure roller mill feeding surge bin material level control module, and the high-pressure roller mill feeding surge bin material level control module comprises a high-pressure roller mill feeding surge bin material level gauge 312, a mine leakage car reversible motor 211 and a vibrating feeder 13 which are mutually interlocked. Detecting the material level of the high-pressure roller mill feeding buffer bin through a high-pressure roller mill feeding buffer bin material level indicator 312, and giving a high material level alarm if the material level exceeds the preset high material level of the preset high-pressure roller mill feeding buffer bin; if the material level is lower than the preset low material level of the preset high-pressure roller mill feeding buffer bin, the low material level alarm is carried out; the high-pressure roller mill feeding buffer bin is preset with a high material level and the high-pressure roller mill feeding buffer bin is preset with a low material level, and the setting is carried out according to the actual use situation. When the material level in the high-pressure grinding feeding buffer bin is in the low material level alarm, the reversible motor of the remote operation mine leakage car moves to the high-pressure grinding feeding buffer bin with the low material level alarm for material distribution. When the high material level alarm is detected by all the 3 high-pressure roller mill feeding buffering bins, the working table number of the vibration feeder is automatically reduced by interlocking to adjust the feeding amount. When the low material level alarm is detected by all the 3 high-pressure roller mill feeding buffering bins, the working table number of the vibration feeder is automatically increased by interlocking to adjust the feeding amount.
The mine leakage vehicle is driven by a mine leakage vehicle driving control module according to a set control mode, the mine leakage vehicle driving control module comprises a mine leakage vehicle reversible action motor 211, a mine leakage vehicle proximity switch 212 and mine leakage vehicle position sensors 213 which are arranged every 2-3 meters along the mine leakage vehicle driving route, the mine leakage vehicle position can be displayed on a control screen, and a remote terminal can be used for controlling the mine leakage vehicle reversible action motor 211, so that the distribution position of the mine leakage vehicle is controlled.
In one particular embodiment, in the step of crushing by feeding high pressure roller mill 33 via high pressure roller mill feed belt conveyor 32, high pressure roller mill feed belt conveyor 32 feeds material into high pressure roller mill 33 via high pressure roller mill hopper 331, the method comprising: when the high-pressure roller mill hopper 331 carries out high-level alarming of the high-pressure roller mill hopper, the corresponding high-pressure roller mill feeding belt conveyor 32 is interlocked to decelerate; when the high-pressure roller mill hopper 331 alarms for low material level of the high-pressure roller mill hopper, the corresponding high-pressure roller mill feeding belt conveyor 32 is interlocked to accelerate.
The hopper level control of the high-pressure roller mill is realized by a hopper level control module of the high-pressure roller mill, and the hopper level control module of the high-pressure roller mill comprises a high-pressure roller mill hopper pressure gauge 332 and a high-pressure roller mill feeding belt conveyor motor 321 which are in linkage. The material loading of the high pressure roll mill hopper is detected by a high pressure roll mill hopper pressure gauge 332. When the high-pressure roller mill hopper pressure gauge 332 detects that the weight of the material in the high-pressure roller mill hopper 331 is higher than 95% of the weight of the full hopper, a high material level alarm is carried out, and the motor 321 of the chain high-pressure roller mill feeding belt conveyor automatically carries out chain frequency-reducing speed reduction. When the high-pressure roller mill hopper pressure gauge 332 detects that the weight of the material in the high-pressure roller mill hopper 331 is lower than 85% of the weight of the full hopper, a low material level alarm is carried out, and the motor 321 of the chain high-pressure roller mill feeding belt conveyor is automatically chain-increased in frequency and accelerated.
Because the hopper level control of the high pressure roller mill is closely related to the operating pressure of the high pressure roller mill, the product granularity of the high pressure roller mill is directly influenced, and therefore, precise control is required. Because the material level gauge is of a ray reflection principle type and can only measure the material level height at a single point, the accurate control requirement of the material level gauge cannot be met. The accurate control of the working pressure of the high-pressure roller mill is realized by selecting a more accurate high-pressure roller mill hopper pressure gauge. The control mode has unique operation variable, and can indirectly and effectively control the weight of the high-pressure roller mill hopper with 90% of full hopper, thereby realizing the full extrusion ore feeding of the high-pressure roller mill and optimizing the crushing effect of the high-pressure roller mill.
As an improvement of the implementation, in order to protect the high-pressure roller mill from iron, in the step of feeding the material from the first leakage mine car 21 into the high-pressure roller mill feeding buffer bin 31 and feeding the material into the high-pressure roller mill 33 for crushing through the high-pressure roller mill feeding belt conveyor 32, the method further comprises an iron removing step, wherein the specific step comprises the steps of adjusting the action of the plow-type unloading machine 61 arranged in the conveying direction of the high-pressure roller mill feeding belt conveyor 32 according to the presence or absence of an iron on the high-pressure roller mill feeding belt conveyor 32 so as to remove the iron in the material on the high-pressure roller mill feeding belt conveyor 32; when iron devices are detected in the materials on the high-pressure roller mill feeding belt conveyor 32, triggering the plow-type unloader 61 to press the high-pressure roller mill feeding belt conveyor 32, and enabling the iron devices on the high-pressure roller mill feeding belt conveyor 32 to enter a receiving hopper through a discharge port of the plow-type unloader 61; when the iron enters the receiving hopper, the plow 61 is triggered to disengage the high pressure roller mill feed belt conveyor 32.
It should be noted that, the protection of the over-iron of the high-pressure roller mill is realized by an over-iron protection control module of the high-pressure roller mill. The over-iron protection control module of the high-pressure roller mill comprises a plow discharger 61, a first metal detector 62, a second metal detector 63 and a plow discharger motor 64. Specifically, the over-iron protection control module of the high-pressure roller mill is composed of a first metal detector 62 arranged at the upper part of the feeding belt conveyor 32 of the high-pressure roller mill, a plow discharger 61 positioned 3 meters in front of the metal detector 62 along the material conveying direction, a receiving hopper arranged below a discharge opening of the plow discharger 61, and a second metal sensor 63 arranged at an upper opening of the receiving hopper. The first metal detector detects the iron device and automatically alarms, and triggers the linked plow discharger motor 64 to rotate forward, the plow discharger 61 presses the belt, the iron device falls into the receiving hopper through the plow discharger discharge hole, the second metal detector 63 on the receiving hopper detects the iron device and automatically alarms, triggers the linked plow discharger motor 64 to rotate reversely, and the plow discharger 61 is separated from the belt.
The iron detection pre-alarm through the front metal detector is adopted before the material is fed into the high-pressure roller mill, the plow discharger removes iron, and the rear metal detector detects whether the iron is removed or not, so that the shutdown of the high-pressure roller mill feeding belt conveyor 32 is not required when the iron is removed, the iron removal effect is ensured, the influence on the high-pressure roller mill feeding is avoided, and the high-pressure roller mill is favorably protected.
S3, feeding crushed materials into a second belt conveyor 41 provided with a second mine leakage car 40.
S4, the second mine leakage car 40 sends the crushed materials into Y vibrating units for screening operation to obtain oversize materials and undersize materials, the oversize materials are taken as return materials through a return belt conveyor 50, and the undersize materials enter a magnetic separation process; wherein the vibration unit comprises a screening buffer bin 51, a screening feeding belt conveyor 52 and a vibration screen 53 which are correspondingly arranged; the crushed materials are sent into a screening buffer bin 51 from a second leaky mine car 40, sent into a vibrating screen 53 for screening through a screening feeding belt conveyor 52, and Y is more than or equal to 6 and is an integer.
It should be noted that, according to the mineral yield in the actual application scene, the number of the vibrating screens can be 6-10, in this embodiment, 6 vibrating screens are taken as an example; the 6 shakers contained 2 spare screens.
The material is fed into the second belt conveyor 41 provided with the second hopper car 40 above, is fed into the screening feeding belt conveyor 52 through the discharge hopper 511 at the lower part of the screening buffer bin 51, is fed into the 6 vibrating screens 53, and the undersize material automatically flows to the undersize pump pool 72, is conveyed to the large-granularity pre-magnetic separation by the pump 71, enters the magnetic separation workshop, and the oversize material is fed into the returning belt conveyor 50 to form a closed circuit. Each vibrating screen 53 is provided with the same screening buffer bin 51, the structure of the buffer bin is a square table with the inclination angle of 70 degrees and the upper part and the lower part, 6 screening buffer bins 51 and the vibrating screens 53 are divided into a left group and a right group, and three screens in each group comprise two positive screens and one standby screen; namely two vibrating screens working normally and one spare vibrating screen.
In a specific implementation process, the screening buffer bins stop at the middle of each group, namely when the middle screening buffer bin is standby, the cloth materials of the screening buffer bins at two sides are switched to be required to pass through the middle screening buffer bin, and the middle screening buffer bin can only be forced to receive the materials at the moment, so that the most adverse condition of the cloth materials of the screening buffer bins is that in the embodiment, the number of the screening buffer bins is 6, more ore bins are arranged, the mode of continuously running the cloth materials from the first bin to the last bin in a reciprocating manner is adopted, the mode of arranging the ore bins is adopted, and the problems that the number of the ore bins is more, the high material level or the low material level of the plurality of ore bins are alarmed when the cloth materials are switched at fixed points, and the switching is not timely and mutually conflicted are avoided.
The material distribution mode of the second mining car 40 is set to reciprocate continuously from the first bin to the last bin. When the material is only distributed to the single screening surge bin 51 (only fed and not discharged at the moment), the time required from empty bin to full storage is t 1b Hours. When the intermediate vibrating screen 53 of each group is stopped, the time for the second mine leakage vehicle to pass through the intermediate screening surge bin 51 is 1/6 of the total distribution time, so that the time for the intermediate screening surge bin 51 to go from empty to full is 6t 1b ，t 1b The effective volume of the single screening surge bin 51 can store t for 0.5-1 hour 1b Hours of material.
That is, in the most unfavorable case, that is, when the intermediate screening surge bins of both groups are standby bins, the time required for the intermediate screening surge bins to be fully charged from empty is a single binThe net storage time of the individual ore bins (continuous feeding without discharging at this time, from empty bin to full storage) is 6 times, i.e. 6t 1b ，t 1b The required value is 0.5-1 hour, namely the total time is 3-6 hours, and the time greatly exceeds the replacement time of the screen mesh of the vibrating screen and the vibration exciter, so that the maintenance of the standby vibrating screen is realized under the condition of not influencing production, and the productivity of the whole system is favorably ensured.
In one specific embodiment, the step of feeding crushed material from the second leaky mine car 40 into the screening surge bin 51 further includes: the second mine leakage vehicle 40 distributes materials to the screening feeding buffer bin 51 in a reciprocating and circulating mode one by one according to the setting sequence; detecting the material level of the screening feeding buffer bin 51; if a certain screening feeding buffer bin 51 carries out low material level alarm, a second mine leakage car 40 carries out material distribution on the screening feeding buffer bin; if a certain screening feeding buffer bin 51 carries out high material level alarm, the second mine leakage car 40 stops distributing the screening feeding buffer bin; when the whole screening feed surge bin 51 gives a low level alarm, the interlocking high pressure roller mill feed belt conveyor 32 accelerates to increase the feed amount; when the full screen feed surge bin 51 is high level warning, the interlocking high pressure roller mill feed belt conveyor 32 is decelerated to reduce the amount of feed.
The screening buffer bin level control link is realized by a screening buffer bin level control module, and the screening buffer bin level control module comprises a screening buffer bin level gauge 512, a mine leakage car two reversible motor 401 and a high-pressure roller mill feeding belt conveyor motor 321 which are mutually linked. Screening buffer bin 51 is subjected to material level detection by using screening buffer bin material level indicator 512, and when the material level of the screening buffer bin is lower than a preset low material level, a low material level alarm is performed; the remote operation mine leakage car II reversible motor 401 moves to the screening buffer bin with current alarm for material distribution. When the material level of the screening buffer bin exceeds the preset high material level, high material level alarm is carried out, and the second reversible motor of the mine leakage car is remotely operated to enable the mine leakage car to move to the screening buffer bin which does not carry out high material level alarm. When the high material level alarm is detected by all 6 screening buffer bins, the motor 321 of the high-pressure roller mill feeding belt conveyor automatically performs chain frequency-reducing speed reduction. When the low material level alarm is detected by all 6 screening buffer bins, the motor 321 of the high-pressure grinding feeding belt conveyor is automatically linked to accelerate in a frequency increasing way.
The control mode is linked by a reversible motor of a single bin alarm and a mine leakage car, and a full bin alarm and a high-pressure roller mill feeding belt conveyor motor 321 are linked. The multi-bin alarm control method realizes the hierarchical control processing of multi-bin alarm, and achieves the aims that the single-stage control operation variable is unique and the variable is different from each other, so that the operation conflict of multi-head control is avoided, and the control is simple, effective and smooth.
In one particular embodiment, when all of the screen feed surge bins 51 are low level alerting and the high pressure mill hopper 331 is high level alerting simultaneously, the priority linkage high pressure mill feed belt conveyor 32 accelerates; when all screening feed surge bins 51 are giving a high level alarm and the high pressure mill hopper 331 is simultaneously giving a low level alarm, the priority linkage high pressure mill feed belt conveyor 32 is decelerated.
That is, the high pressure roller mill hopper level control module and the screening surge bin level control module are both automatically interlocked with the high pressure roller mill feed belt conveyor motor 321, the operation priority is set to be screening surge bin level control prior to high pressure roller mill hopper level control, and screening surge bin level is preferentially adjusted when operation conflicts.
In summary, by prioritizing the participation of a single operating variable in both control objectives, i.e., prioritizing the interlocking operation of the high pressure grinding feed belt conveyor motor 32 to the screening surge bin level control over the high pressure grinding hopper level control, operational conflicts are advantageously avoided, optimizing the overall control program.
In one particular embodiment, when the high pressure roller mill feed belt conveyor 32 requires servicing, the discharge hopper gate valve 313 of its corresponding high pressure roller mill feed surge bin is interlocked shut. Similarly, when the screen feed belt conveyor 52 needs to be serviced, the discharge hopper gate valves of its corresponding screen surge bin are interlocked shut. Specifically, the overhaul control module is composed of electrohydraulic gate valves which are respectively arranged on the discharging hopper below each high-pressure roller mill feeding buffering bin and the sieving buffering bin. When the under-bin feeding belt conveyor overhauls, the discharging of the ore bin is cut off. Through the electrohydraulic gate valve arranged on the discharging hopper below the feeding buffer bin of the high-pressure roller mill and the screening buffer bin, the material flow can be cut off and ore feeding is stopped when the follow-up equipment of the lower belt conveyor is overhauled, thereby realizing static overhauling of the follow-up equipment and being beneficial to maintenance of the follow-up equipment.
The invention also comprises a closed-circuit control system for the high-pressure roller grinding before magnetite grinding.
The closed-circuit control system for the high-pressure roller grinding before magnetite grinding comprises a material conveying unit, a material crushing unit, a material screening unit and a control unit; a material conveying unit, configured to feed the new material formed by the vibratory feeder 13 and the return material conveyed by the return belt conveyor 50 into a first belt conveyor 20 provided with a first hopper car 21; the material crushing unit is used for conveying the first material 21 of the mining car into the X high-pressure roller grinding units for crushing operation to form crushed materials; the high-pressure roller mill unit comprises a high-pressure roller mill feeding buffer bin 31, a high-pressure roller mill feeding belt conveyor 32 and a high-pressure roller mill 33 which are correspondingly arranged; the material self-leaking mine car I21 is sent into a high-pressure roller mill feeding buffer bin 31, and is sent into a high-pressure roller mill 33 for crushing through a high-pressure roller mill feeding belt conveyor 32; x is more than or equal to 3, and X is an integer; a material screening unit for feeding crushed material into a second belt conveyor 41 provided with a second hopper car 40; the second hopper car 40 sends the crushed materials into Y vibrating units for screening operation to obtain oversize materials and undersize materials, the oversize materials are taken as return materials through a return belt conveyor 50, and the undersize materials enter a magnetic separation process; wherein the vibration unit comprises a screening buffer bin 51, a screening feeding belt conveyor 52 and a vibration screen 53 which are correspondingly arranged; the crushed materials are sent into a screening buffer bin 51 from a second leaky mine car 40, sent into a vibrating screen 53 for screening through a screening feeding belt conveyor 52, and Y is more than or equal to 6 and is an integer. And the control unit is used for controlling the material conveying unit, the material crushing unit and the material screening unit.
Specifically, the control unit comprises a raw ore bin capacity control module, a high-pressure roller mill feeding buffer bin material level control module, a mine leakage car traveling control module, a high-pressure roller mill feeding hopper material level control module, a high-pressure roller mill iron passing protection control module, a screening buffer bin material level control module and an overhaul control module.
The raw ore bin capacity control module comprises a raw ore bin level gauge 101 arranged at the top of a raw ore bin 10 and a long-distance belt conveyor 11 which are in common linkage.
The material level alarm of the high-pressure roller mill feeding buffering bin is realized by a high-pressure roller mill feeding buffering bin material level control module, and the high-pressure roller mill feeding buffering bin material level control module comprises a high-pressure roller mill feeding buffering bin material level gauge 312, a mine leakage car reversible motor 211 and a vibrating feeder 13 which are mutually interlocked.
The mine leakage vehicle is driven according to a set control mode through a mine leakage vehicle driving control module, and the mine leakage vehicle driving control module comprises a mine leakage vehicle reversible action motor 211, a mine leakage vehicle proximity switch 212 and mine leakage vehicle position sensors 213 which are arranged every 2-3 meters along the mine leakage vehicle driving route.
The hopper level control of the high-pressure roller mill is realized by a hopper level control module of the high-pressure roller mill, and the hopper level control module of the high-pressure roller mill comprises a high-pressure roller mill hopper pressure gauge 332 and a high-pressure roller mill feeding belt conveyor motor 321 which are in linkage.
The over-iron protection of the high-pressure roller mill is realized by an over-iron protection control module of the high-pressure roller mill. The over-iron protection control module of the high-pressure roller mill comprises a plow discharger 61, a first metal detector 62, a second metal detector 63 and a plow discharger motor 64.
The screening buffer bin level control module comprises a screening buffer bin level gauge 512, a mining car II reversible motor 401 and a high-pressure roller mill feeding belt conveyor motor 321 which are mutually linked.
The overhaul control module is composed of electrohydraulic gate valves which are respectively arranged on the discharging hopper below each high-pressure roller mill feeding buffering bin and the sieving buffering bin.
The specific implementation manner of the closed-circuit control system of the high-pressure roller before magnetite grinding is the same as that of the closed-circuit control method of the high-pressure roller before magnetite grinding, and is not repeated here.
In summary, the invention relates to a closed-circuit control system and a method for high-pressure roller grinding before magnetite grinding, which realize that the production of the whole system is orderly carried out during the shutdown maintenance period of the high-pressure roller grinding and the vibrating screen by setting the quantity and the control mode of the high-pressure roller grinding and the vibrating screen, thereby ensuring the production progress of the whole assembly line; the reversible motor linkage of the single bin alarm and the mine leakage vehicle is adopted, and the mode of the full bin alarm and the start-stop linkage of the vibrating feeder at the lower part of the raw ore bin is adopted, so that the problem of high material level alarm or low material level alarm in multiple ore bins is solved; the multi-bin alarm system realizes the hierarchical processing of multi-bin alarm, and realizes the purposes that the operation variables of single-stage control are unique and the variables are different from each other, so that the operation conflict of multi-head control is avoided, and the overall working efficiency is further improved. The automatic degree of the whole high-pressure roller mill closed-circuit screening system is improved, the manual control link is reduced, and the technical effect of accurate control of the production progress is realized under the condition of saving human resources.
However, it will be appreciated by those skilled in the art that various modifications may be made to the magnetite pre-mill high pressure roller mill closed circuit control system and method provided by the present invention described above without departing from the teachings of the present invention. Accordingly, the scope of the invention should be determined from the following claims.
Claims (9)
1. A closed-circuit control method for a high-pressure roller mill before magnetite grinding is characterized by comprising the following steps:
feeding the new material formed by the vibration feeder and the returned material conveyed by the returned belt conveyor into a first belt conveyor provided with a first mine leakage car;
the first material is sent to X high-pressure roller grinding units for crushing operation to form crushed materials; the high-pressure roller mill unit comprises a high-pressure roller mill feeding buffer bin, a high-pressure roller mill feeding belt conveyor and a high-pressure roller mill which are correspondingly arranged; the material is sent into a high-pressure roller mill feeding buffer bin from the first mine leakage car and is sent into the high-pressure roller mill for crushing through the high-pressure roller mill feeding belt conveyor; x is more than or equal to 3, and X is an integer; at least one standby high-pressure roller mill exists in the X high-pressure roller mill units; wherein, the high/low material level alarm of the high-pressure roller mill feeding buffer bin is linked with the reversible motor of the first mine leakage car; the material is sent into the feeding buffer bin of the high-pressure roller mill in a reciprocating and circulating mode one by one according to the setting sequence from the first mine leakage car, and the method further comprises the following steps: detecting the material level of a high-pressure roller mill feeding buffer bin, and if a certain high-pressure roller mill feeding buffer bin carries out low material level alarm, distributing a pair of high-pressure roller mill feeding buffer bins by a mine leakage car until the high-pressure roller mill feeding buffer bin carries out high material level alarm, wherein the first mine leakage car finishes the material distribution operation of the high-pressure roller mill feeding buffer bin; when all high-pressure grinding feeding buffering bins perform low material level alarming, the starting-up quantity of the vibrating feeder is increased to increase the feeding quantity; when all high-pressure grinding feeding buffering bins carry out high material level alarming, the starting-up quantity of the vibrating feeder is reduced to reduce the feeding quantity;
The crushed materials are fed into a second belt conveyor provided with a second mine leakage car;
the second ore leakage car sends the crushed materials into Y vibrating units for screening operation to obtain oversize materials and undersize materials, the oversize materials are taken as return materials through a return belt conveyor, and the undersize materials enter a magnetic separation process; the vibrating unit comprises a screening buffer bin, a screening feeding belt conveyor and a vibrating screen which are correspondingly arranged; the crushed materials are sent into a screening buffer bin from the second mine leakage vehicle and are sent into the vibrating screen for screening through the screening feeding belt conveyor, wherein Y is more than or equal to 6, and Y is an integer; the high/low material level alarm of the screening feeding buffer bin is linked with a reversible motor of the second mine leakage car; the vibrating units are divided into two groups, the number of the vibrating units in each group is 3, and a vibrating screen in a standby state is arranged in each group of vibrating units.
2. The closed-circuit control method for high-pressure roller grinding before magnetite grinding according to claim 1, wherein the step of feeding the crushed material from the secondary hopper car into a screening buffer bin further comprises:
the second mine leakage vehicle is used for distributing the screening feeding buffer bin in a reciprocating and circulating mode one by one according to the setting sequence; detecting the material level of the screening feeding buffer bin;
If a certain screening feeding buffer bin carries out low material level alarm, a second mine leakage car carries out material distribution on the screening feeding buffer bin;
if a certain screening feeding buffer bin carries out high material level alarm, stopping distributing the screening feeding buffer bin by a second mine leakage car;
when all screening feeding buffer bins perform low material level alarming, the interlocking high-pressure roller mill feeding belt conveyor accelerates to increase the feeding amount;
when all screening feeding buffer bins carry out high material level alarming, the linked high-pressure roller mill feeding belt conveyor decelerates to reduce the feeding amount.
3. The magnetite pre-grinding high-pressure roller grinding closed-circuit control method according to claim 1, wherein,
in the step of crushing by feeding the high-pressure roller mill through the high-pressure roller mill feed belt conveyor, the high-pressure roller mill feed belt conveyor feeds material into the high-pressure roller mill through the high-pressure roller mill hopper, the method comprising:
when the high-pressure roller mill hopper gives an alarm on the high material level of the high-pressure roller mill hopper, the corresponding high-pressure roller mill feeding belt conveyor is interlocked to decelerate;
and when the high-pressure roller mill hopper gives an alarm of the low material level of the high-pressure roller mill hopper, the corresponding high-pressure roller mill feeding belt conveyor is interlocked to accelerate.
4. The magnetite pre-grinding high-pressure roller grinding closed-circuit control method according to claim 2, characterized in that,
when all screening feeding buffering bins perform low material level alarming, the high-pressure roller mill feeding hopper performs high material level alarming at the same time, the high-pressure roller mill feeding belt conveyor is preferentially linked to accelerate;
when all screening feeding buffering bins perform high material level alarming, the high-pressure roller mill feeding hopper simultaneously performs low material level alarming on the high-pressure roller mill feeding hopper, the high-pressure roller mill feeding belt conveyor is preferentially linked to slow down.
5. The magnetite pre-grinding high-pressure roller grinding closed-circuit control method according to claim 1, wherein,
the inclination angles of the high-pressure grinding feeding buffer bin and the screening feeding buffer bin are equal to 70 degrees, and the high-pressure grinding feeding buffer bin and the screening feeding buffer bin are square tables with large upper parts and small lower parts.
6. The magnetite pre-grinding high-pressure roller grinding closed-circuit control method according to claim 1, wherein,
and in the step that the material is fed into a high-pressure roller mill feeding buffer bin from the first mine leakage car and is fed into the high-pressure roller mill for crushing through the high-pressure roller mill feeding belt conveyor, the method further comprises the following steps:
according to whether an iron device exists on the high-pressure roller mill feeding belt conveyor, adjusting the action of a plow-type unloading machine arranged in the conveying direction of the high-pressure roller mill feeding belt conveyor so as to remove the iron device in the materials on the high-pressure roller mill feeding belt conveyor; wherein,
Triggering a plow-type unloader to press the high-pressure roller mill feeding belt conveyor after detecting that an iron device exists in materials on the high-pressure roller mill feeding belt conveyor, wherein the iron device on the high-pressure roller mill feeding belt conveyor enters a receiving hopper through a discharge port of the plow-type unloader; and triggering the plow-type unloader to be separated from the high-pressure roller mill feeding belt conveyor after the ironware enters the receiving hopper.
7. The magnetite pre-grinding high-pressure roller grinding closed-circuit control method according to claim 1, wherein,
in the step of forming new material by the vibration feeder, the method further comprises the following steps:
conveying raw ore to a raw ore bin through a long-distance belt conveyor, and detecting the raw ore level of the raw ore bin;
when the raw ore material level exceeds the preset high material level of the raw ore, carrying out high material level alarm of the raw ore bin, and stopping the chain long-distance belt conveyor;
when the raw ore material level exceeds the preset low material level of the raw ore, the low material level alarm of the raw ore bin is carried out, and the chain long-distance belt conveyor is started.
8. The magnetite pre-grinding high-pressure roller grinding closed-circuit control method according to claim 1, wherein,
when the high-pressure roller mill feeding belt conveyor needs to be overhauled, the discharge hopper gate valve of the corresponding high-pressure roller mill feeding buffer bin is closed in a linkage mode.
9. The closed-circuit control system for the high-pressure roller mill before magnetite grinding is characterized by comprising a material conveying unit, a material crushing unit, a material screening unit and a control unit;
the material conveying unit is used for feeding the new material formed by the vibrating feeder and the returned material conveyed by the returned material belt conveyor into the belt conveyor I provided with the first mine leakage car;
the material crushing unit is used for conveying the material into the X high-pressure roller grinding units for crushing operation to form crushed materials; the high-pressure roller mill unit comprises a high-pressure roller mill feeding buffer bin, a high-pressure roller mill feeding belt conveyor and a high-pressure roller mill which are correspondingly arranged; the material is sent into a high-pressure roller mill feeding buffer bin from the first mine leakage car and is sent into the high-pressure roller mill for crushing through the high-pressure roller mill feeding belt conveyor; x is more than or equal to 3, and X is an integer; the X high-pressure grinding units comprise a high-pressure grinding machine in a standby state; wherein, the high/low material level alarm of the high-pressure roller mill feeding buffer bin is linked with the reversible motor of the first mine leakage car; the material is sent into the feeding buffer bin of the high-pressure roller mill in a reciprocating and circulating mode one by one according to the setting sequence from the first mine leakage car, and the method further comprises the following steps: detecting the material level of a high-pressure roller mill feeding buffer bin, and if a certain high-pressure roller mill feeding buffer bin carries out low material level alarm, distributing a pair of high-pressure roller mill feeding buffer bins by a mine leakage car until the high-pressure roller mill feeding buffer bin carries out high material level alarm, wherein the first mine leakage car finishes the material distribution operation of the high-pressure roller mill feeding buffer bin; when all high-pressure grinding feeding buffering bins perform low material level alarming, the starting-up quantity of the vibrating feeder is increased to increase the feeding quantity; when all high-pressure grinding feeding buffering bins carry out high material level alarming, the starting-up quantity of the vibrating feeder is reduced to reduce the feeding quantity;
The material screening unit is used for feeding the crushed materials into a second belt conveyor provided with a second mine leakage car; the second ore leakage car sends the crushed materials into Y vibrating units for screening operation to obtain oversize materials and undersize materials, the oversize materials are taken as return materials through a return belt conveyor, and the undersize materials enter a magnetic separation process; the vibrating unit comprises a screening buffer bin, a screening feeding belt conveyor and a vibrating screen which are correspondingly arranged; the crushed materials are sent into a screening buffer bin from the second mine leakage vehicle and are sent into the vibrating screen for screening through the screening feeding belt conveyor, wherein Y is more than or equal to 6, and Y is an integer; a high/low material level alarm of the screening feeding buffer bin is linked with a reversible motor of a second mine leakage car;
the control unit is used for controlling the material conveying unit, the material crushing unit and the material screening unit; the vibrating units are divided into two groups, the number of the vibrating units in each group is 3, and a vibrating screen in a standby state is arranged in each group of vibrating units.
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| AT4116U1 (en) * | 2000-03-16 | 2001-02-26 | Othmar Ing Hajek | MOBILE SYSTEM FOR CRUSHING ROCK |
| CN203265247U (en) * | 2013-05-14 | 2013-11-06 | 宜都中起重工机械有限公司 | Economical garbage pretreatment system |
| CN104624346B (en) * | 2015-03-13 | 2017-06-27 | 中冶北方（大连）工程技术有限公司 | The closed circuit wet screening system of high pressure roller mill |
| CN106179674B (en) * | 2016-07-11 | 2018-04-17 | 杨立武 | One kind steel-making tailings recycling recoverying and utilizing method and system |
| CN208098193U (en) * | 2018-02-26 | 2018-11-16 | 重钢西昌矿业有限公司 | A kind of high-pressure roller mill feeding system of even feeding |
| CN112007738B (en) * | 2019-12-19 | 2022-03-22 | 中蓝连海设计研究院有限公司 | Unmanned mine homogenizing batching system and method |
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