CN111298952B - Control method for time-interval variable-speed variable-frequency automatic operation of ball mill - Google Patents
Control method for time-interval variable-speed variable-frequency automatic operation of ball mill Download PDFInfo
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- CN111298952B CN111298952B CN202010241874.1A CN202010241874A CN111298952B CN 111298952 B CN111298952 B CN 111298952B CN 202010241874 A CN202010241874 A CN 202010241874A CN 111298952 B CN111298952 B CN 111298952B
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- ball mill
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000000227 grinding Methods 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims description 37
- 230000005540 biological transmission Effects 0.000 claims description 19
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 238000000498 ball milling Methods 0.000 claims description 2
- 239000002002 slurry Substances 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005299 abrasion Methods 0.000 abstract description 2
- 239000004575 stone Substances 0.000 description 6
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
Classifications
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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
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
A control method for time-interval variable-speed variable-frequency automatic operation of a ball mill is carried out according to the following steps: in the first stage, the frequency converter sets the running frequency of 50HZ, the running time is 3 hours, and the running speed of the motor is 14.3 revolutions per minute; in the second stage, the frequency converter sets the running frequency of 45HZ, the running time is 2 hours, and the running speed of the motor is 12.8 revolutions per minute; in the third stage, the frequency converter sets the running frequency of 42HZ, the running time is 2 hours, and the running speed of the motor is 12 revolutions per minute; and in the fourth stage, the frequency converter sets the running frequency of 40HZ, the running time is 2.5 hours, and the running speed of the motor is 11.5 revolutions per minute. The control method is simple and easy to operate, effectively reduces impact damage to the transformer, reduces the voltage drop of a power grid, prolongs the service life of the motor, shortens the grinding time of the ball mill, improves the utilization rate of the ball mill, reduces abrasion of a lining and a grinding body of the ball mill, and reduces the manufacturing cost of slurry.
Description
Technical Field
The invention relates to a control method of a ball mill starting form, in particular to a control method of a ball mill for time-interval variable-speed variable-frequency automatic operation.
Background
Ball mills are grinding equipment commonly used in the production field. The early ball mill adopts a self-coupling voltage reduction starting mode, and the starting current of the motor can reach 6-7 times of the rated current of the motor; in a soft start mode adopted in the later period, the starting current of the motor can also reach 4-5 times of the rated current of the motor; the starting modes cause too large impact on a transformer power grid, large voltage fluctuation, reduced power factor and overlarge starting power consumption, accelerate the aging degree of a contactor arranged in a starting cabinet and a mechanical transmission facility arranged in a ball mill, and bring negative factors to users.
At present, there are many energy-saving control devices or methods suitable for ball mills. Many energy-saving control devices only control the starting current, and because different materials need different rotating forces, the current is not easy to control, or the precision of the equipment needing to be controlled is higher, the investment or purchase cost is higher, and great economic burden or pressure is brought to users; many energy-saving control methods do not save electricity, and the impact force applied to the ball mill during starting is very large, so that the ball mill bearing and the wave box gear are easy to damage, the service cycle is short, and the maintenance cost is high.
With the rapid development of the electrical appliance automation control technology, the defect that the operation mode of the ball mill is changed by a method of controlling the frequency of a frequency converter and the operation forwarding and time of a transmission motor of the ball mill through a PLC program is also overcome, but the frequency converter and the transmission motor of the ball mill are optimized in the starting stage of the ball mill, and the later operation of the ball mill does not specifically control the efficiency improvement of the ball mill on ground materials, so that the method can reduce the impact of the ball mill on a power grid during starting, but still cannot solve the practical problems of short service life, low efficiency, high operation cost and the like of the ball mill.
Disclosure of Invention
The invention provides a control method for realizing the variable-frequency of a ball mill at different time intervals and different rotating speeds aiming at the defect of adverse consequences generated in the production process due to the existing starting mode of the ball mill in the background technology.
The technical scheme adopted by the invention is as follows: a control method for time-interval variable-speed variable-frequency automatic operation of a ball mill comprises the following steps:
(1) first stage
Setting the running frequency of a frequency converter of the ball mill to be 50HZ, the running time to be 3 hours and the running speed of a motor of the ball mill to be 14.3 revolutions per minute;
(2) second stage
Setting the running frequency of a frequency converter of the ball mill to be 45HZ, the running time to be 2 hours and the running speed of a motor of the ball mill to be 12.8 revolutions per minute;
(3) the third stage
Setting the running frequency of a frequency converter of the ball mill to be 42HZ, setting the running time to be 2 hours, and setting the running speed of a motor of the ball mill to be 12 r/min;
(4) fourth stage
The frequency converter of the ball mill is set to have the operation frequency of 40HZ, the operation time of 2.5 hours and the operation speed of the motor of the ball mill of 11.5 revolutions per minute.
When the ball mill is controlled by variable frequency at variable time and variable speed, the diameter and the proportion of a grinding body are selected according to the particle size of a grinding material, and the diameter grading of the grinding body is selected according to the following requirements:
the diameter of the medium aluminum material grinding body is as follows: 70mm, 60mm, 50mm, 40 mm;
diameter of the high-aluminum material grinding body: 30mm and 20 mm.
When the control method is applied, a transmission motor of the ball mill is connected with a frequency converter, and the frequency converter and the transmission motor are both connected with a PLC; the frequency of the frequency converter at each stage and the rotating speed value of the transmission motor are preset in the PLC.
After the ball mill is started, the ball mill is operated according to requirements in each stage, and the conversion between the operation parameters of each stage is preset in a PLC program.
Compared with the prior art, the time-interval variable-rotating-speed variable-frequency control method of the ball mill disclosed by the invention is simple and easy to operate, the ball mill is started in a variable-frequency mode, operates in a time-interval variable-rotating-speed mode, and compared with other step-down starting or thyristor throttling soft starting, the impact damage to a transformer is effectively reduced, the voltage drop of a power grid is reduced, the service life of a motor is prolonged, the grinding time of the ball mill is shortened, the utilization rate of the ball mill is improved, the abrasion of a lining and a grinding body of the ball mill is reduced, the power consumption is saved by 10%, and the manufacturing cost of slurry is reduced.
Detailed Description
The present invention will be further described with reference to the following examples.
The control method for the time-interval variable-rotating-speed variable-frequency automatic operation of the ball mill is to control the ball mill to adopt a variable-frequency starting mode and realize the time-interval variable-rotating-speed automatic operation. In the control method, when the ball mill is controlled by variable frequency, time-interval and variable speed, the diameter and the proportion of the grinding body are selected according to the grain diameter of the grinding material, and the diameter grading of the grinding body is selected according to the following requirements:
the diameter of the medium aluminum material grinding body is as follows: 70mm, 60mm, 50mm, 40 mm;
diameter of the high-aluminum material grinding body: 30mm and 20 mm.
The high-aluminum material is adopted to improve the hardness and the wear resistance of the grinding body and ensure the diameter of the grinding body. The scheme can reduce the gap between the grinding bodies in the ball mill, increase the friction area and accelerate the later grinding speed of slurry.
The set operation flow of the ball mill is set according to raw ore materials. The grain diameter ratio of materials in the barrel is larger during the initial operation of the ball mill, and then the materials are designed to run at 50Hz, when a grinding body and the ground materials rotate to 80-85 degrees along with the barrel of the ball mill, the grinding body and the materials leave a circular track and fall along a parabolic track free body (a throwing state), the grinding body falling along the parabolic track impacts and grinds the materials below the barrel of the ball mill, so that the large-grain-diameter materials are quickly damaged and refined, the materials in the ball mill are reduced in grain diameter through one section of impact grinding, a large amount of impact force is not needed, and the grinding among media is increased along with the reduction of the operation speed of the ball mill.
The grinding body and the material have relative friction to slide (the landing) between each layer of grinding body during along the rotatory improvement of ball mill barrel, when the grinding body is equal to the dynamic friction angle with the frictional force of barrel with the material of being ground, grinding body and material just glide (the state of shedding), produce grinding efficiency to the material, reduce design ball mill operating speed one by one according to material grinding time and particle diameter and reduce in proper order and reduce, design ball mill operating speed according to the levigated state of material.
The specific control method comprises the following steps:
(1) first stage
The frequency converter of the ball mill is set to have the operation frequency of 50HZ, the operation time of 3 hours and the operation speed of the motor of the ball mill of 14.3 revolutions per minute.
In the stage, the particle size of the materials filled in the ball mill is larger, and the materials inside the ball mill run quickly to collide with the grinding bodies (ball stones) for impact and friction, so that the crushing and refining of the materials are accelerated.
(2) Second stage
The frequency converter of the ball mill is set to have the operation frequency of 45HZ, the operation time of 3 hours and the operation speed of the motor of the ball mill of 12.8 revolutions per minute.
In the stage, the grain diameter of the materials in the ball mill is refined, and the reduction of the rotating speed of the ball mill increases the friction coefficient of a grinding body (ball stone) to accelerate the refinement of the materials.
(3) The third stage
The frequency converter of the ball mill is set to have the operation frequency of 42HZ, the operation time of 4 hours and the operation speed of the motor of the ball mill of 12 r/min.
In the stage, the particle size of the materials in the ball mill is very refined into slurry, the rotation speed of the ball mill is reduced to increase the friction coefficient of a grinding body (ball stone), the slurry materials are prevented from being attached to the wall by inertia and separated from the grinding body (ball stone), and the material refinement is accelerated.
(4) Fourth stage
The frequency converter of the ball mill is set to have the operation frequency of 38HZ, the operation time of 2.5-3 hours and the operation speed of the motor of the ball mill of 11.5 revolutions per minute.
In the stage, the particle size of the materials in the ball mill is very refined into slurry, the rotation speed of the ball mill is reduced to increase the friction coefficient of a grinding body (ball stone), the slurry materials are prevented from being attached to the wall by inertia and separated from the grinding body (ball stone), and the material refinement is accelerated.
When the control method is applied, a transmission motor of the ball mill is connected with a frequency converter, and the frequency converter and the transmission motor are both connected with a PLC; the frequency of the frequency converter at each stage and the rotating speed value of the transmission motor are preset in the PLC.
After the ball mill is started, the ball mill is operated according to requirements in each stage, and the conversion between the operation parameters of each stage is set through a PLC.
Specific examples illustrate: in the first stage, the ball mill is started, and the PLC sets the running frequency of a frequency converter connected with the ball mill to be 50HZ and the running time to be 3 hours; setting the running speed of a motor of the ball mill to be 14.3 revolutions per minute; when the operation time of the ball mill reaches 3 hours, the PLC program automatically jumps to the second stage, and executes the parameters of the second stage on the frequency of the frequency converter, the rotating speed and the operation time of the transmission motor, namely the frequency converter sets the operation frequency to be 45HZ, the operation time to be 2 hours, and the operation speed of the ball mill motor to be 12.8 revolutions per minute; and the rest can be done until the ball milling finishes the four stages of milling work.
Claims (1)
1. A control method for time-phased variable-speed variable-frequency automatic operation of a ball mill is characterized in that a transmission motor of the ball mill is connected with a frequency converter, and the frequency converter and the transmission motor are both connected with a PLC (programmable logic controller); presetting the frequency of a frequency converter at each stage and the rotating speed value of a transmission motor in the PLC;
the control method comprises the following steps:
(1) first stage
The frequency converter of the ball mill is set to have the operation frequency of 50HZ, the operation time of 3 hours and the operation speed of a transmission motor of the ball mill of 14.3 revolutions per minute;
(2) second stage
Setting the running frequency of a frequency converter of the ball mill to be 45HZ, the running time to be 2 hours, and the running speed of a transmission motor of the ball mill to be 12.8 revolutions per minute;
(3) the third stage
Setting the running frequency of a frequency converter of the ball mill to be 42HZ, setting the running time to be 2 hours, and setting the running speed of a transmission motor of the ball mill to be 12 r/min;
(4) fourth stage
Setting the running frequency of a frequency converter of the ball mill to be 38HZ, setting the running time to be 2.5-3 hours, and setting the running speed of a transmission motor of the ball mill to be 11.5 revolutions per minute;
in the first stage, the ball mill is started, and the PLC sets the running frequency of a frequency converter connected with the ball mill to be 50HZ and the running time to be 3 hours; setting the running speed of a transmission motor of the ball mill to be 14.3 revolutions per minute; when the operation time of the ball mill reaches 3 hours, the PLC program automatically jumps to the second stage, and executes the parameters of the second stage on the frequency of the frequency converter, the rotating speed and the operation time of the transmission motor, namely the frequency converter sets the operation frequency to be 45HZ, the operation time to be 2 hours, and the operation speed of the transmission motor of the ball mill to be 12.8 revolutions per minute; repeating the steps until the ball milling is completed in four stages;
when the ball mill is controlled by time-interval variable-speed frequency conversion, the diameter and the proportion of a grinding body are selected according to the particle size of a grinding material, and the diameter grading of the grinding body is selected according to the following requirements:
the diameter of the medium aluminum material grinding body is as follows: 70mm, 60mm, 50mm, 40 mm;
diameter of the high-aluminum material grinding body: 30mm, 20 mm;
after the ball mill is started, each stage is operated according to requirements, and the conversion between the operation parameters of each stage is preset in a PLC program.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010241874.1A CN111298952B (en) | 2020-03-31 | 2020-03-31 | Control method for time-interval variable-speed variable-frequency automatic operation of ball mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010241874.1A CN111298952B (en) | 2020-03-31 | 2020-03-31 | Control method for time-interval variable-speed variable-frequency automatic operation of ball mill |
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| Publication Number | Publication Date |
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| CN111298952A CN111298952A (en) | 2020-06-19 |
| CN111298952B true CN111298952B (en) | 2021-11-30 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3538991A1 (en) * | 1985-11-02 | 1987-05-21 | Krupp Gmbh | METHOD FOR MINIMIZING MINERAL SUBSTANCES AND DEVICE FOR IMPLEMENTING THE METHOD |
| CN100348328C (en) * | 2005-10-14 | 2007-11-14 | 唐慧光 | Method for improving efficiency, saving energy and lowering consumption of wetting intermitten ball mill |
| CN101797529A (en) * | 2009-12-18 | 2010-08-11 | 深圳市伟创电气有限公司 | Frequency conversion power saving control method of ball mill |
| CN201912972U (en) * | 2010-12-10 | 2011-08-03 | 广州保瓦电子科技有限公司 | High-efficiency ball mill energy saving device |
| CN202479009U (en) * | 2012-01-18 | 2012-10-10 | 山东神州锆业有限公司 | Variable speed grinding device for batch-type ball mill for zirconium silicate ultramicro powder |
| CN108906242A (en) * | 2018-09-10 | 2018-11-30 | 横店集团东磁股份有限公司 | A kind of method of elliposoidal ball mill barrel and its finely divided permanent-magnet ferrite |
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Address after: 063304 No.188 Yutang line, Fengnan District, Tangshan City, Hebei Province Applicant after: Tangshan Hexiang Intelligent Technology Co.,Ltd. Address before: 063000, Daling village, Xinzhuang Town, Fengnan District, Hebei, Tangshan City Applicant before: TANGSHAN HEXIANG INDUSTRIAL Co.,Ltd. |
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Denomination of invention: Control Method of Variable Speed Variable Frequency Automatic Operation of Ball Mill in Different Periods Effective date of registration: 20221008 Granted publication date: 20211130 Pledgee: China Merchants Bank Limited by Share Ltd. Tangshan branch Pledgor: Tangshan Hexiang Intelligent Technology Co.,Ltd. Registration number: Y2022980017596 |
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Date of cancellation: 20221031 Granted publication date: 20211130 Pledgee: China Merchants Bank Limited by Share Ltd. Tangshan branch Pledgor: Tangshan Hexiang Intelligent Technology Co.,Ltd. Registration number: Y2022980017596 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Control Method of Variable Speed Variable Frequency Automatic Operation of Ball Mill in Different Periods Effective date of registration: 20221031 Granted publication date: 20211130 Pledgee: China Merchants Bank Limited by Share Ltd. Tangshan branch Pledgor: Tangshan Hexiang Intelligent Technology Co.,Ltd. Registration number: Y2022980020223 |
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Date of cancellation: 20231122 Granted publication date: 20211130 Pledgee: China Merchants Bank Limited by Share Ltd. Tangshan branch Pledgor: Tangshan Hexiang Intelligent Technology Co.,Ltd. Registration number: Y2022980020223 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Control method for automatic operation of ball mill with variable speed and frequency conversion in different time periods Granted publication date: 20211130 Pledgee: Agricultural Bank of China Tangshan Fengnan Branch Pledgor: Tangshan Hexiang Intelligent Technology Co.,Ltd. Registration number: Y2024980001116 |