CN111515010A - Ball mill control method using electric lugs - Google Patents
Ball mill control method using electric lugs Download PDFInfo
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- CN111515010A CN111515010A CN202010476985.0A CN202010476985A CN111515010A CN 111515010 A CN111515010 A CN 111515010A CN 202010476985 A CN202010476985 A CN 202010476985A CN 111515010 A CN111515010 A CN 111515010A
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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
- B02C17/04—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 with unperforated container
- B02C17/06—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 with unperforated container with several compartments
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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
- B02C17/10—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 with one or a few disintegrating members arranged in the container
Abstract
A ball mill control method using electric lugs comprises a ball mill, wherein the ball mill is provided with three bins, the electric lugs are correspondingly arranged outside each bin, each electric lug is connected with a control device, and the control device is connected with a material returning device and a feeding device. The control device judges the ore amount in each bin according to each electric lug signal and controls the feeding amount of the material returning device and the feeding device. The control method comprises the following steps: firstly, calibrating each bin electric lug to obtain an excess coefficient of each electric lug, and judging the integral excess state; and then calculating the total feeding amount, the current feeding amount and the current returning amount in turn according to a formula. According to the invention, the feeding amount and the returning amount are automatically adjusted according to the excessive coefficient of the ore in each bin, so that the problem that one bin of the ball mill is over-saturated while the other bin of the ball mill is hungry is solved, and the overall grinding efficiency of the ball mill is improved; on the other hand, the rapid abrasion caused by the collision of the grinding body and the lining plate is avoided. The invention reduces the labor intensity of operators and saves the energy consumption.
Description
Technical Field
The invention relates to the field of ore mills, in particular to a ball mill control method using an electric lug.
Background
The grinding of ore is an important link in ore dressing, the 800kw ball mill is the most common equipment in ore grinding operation, and the ball mill adopts a three-bin grid structure and is divided into a coarse grinding bin, a middle grinding bin and a fine grinding bin according to the grain size of the ore to be ground. The broken materials and the return materials sequentially enter a coarse grinding bin, a middle grinding bin and a fine grinding bin according to a fixed proportion for grinding. In order to monitor the feeding amount, an electric lug is arranged outside the rough grinding bin of the ball mill, and the electric lug can detect the material level of ore through sound. When the feeding is excessive, the grinding body cannot be knocked on the lining plate when thrown off, the sound is stuffy, and the current value of the electric ear signal is low; when the feeding is too little, the grinding body knocks the lining plate when falling, the sound is loud, and the current value of the electric ear signal is high. Thereby enabling the operator to control the amount of material delivered by the electric ear signal.
But this control scheme is not perfect. In actual work, due to changes of ore properties (such as hardness, mud content and the like) and particle sizes, or due to unbalanced proportion of grinding bodies in each bin, the grinding efficiency of each bin has large difference, and the phenomenon that one bin is over-saturated and the other bin is hungry often occurs. The over-full bin has low grinding efficiency and less discharge, which causes the hungry of the lower bin. The hunger storehouse has less material feeding, so the grinding body and the lining board are knocked and collided to cause rapid abrasion. The current solution is to manually participate in the control, reduce the total feed rate, and increase the feed back ratio. This solution requires a lot of experience from the operator, but this experience is not an accurate and dependent control due to human factors, and the operator cannot adjust the solution at any time. Mineral separation is continuous operation for a long time, and for an 800kw ball mill, the reduction of the mineral grinding efficiency causes huge energy consumption. Therefore, the invention provides a control method capable of automatically and accurately solving the problems of overfull and hunger of the ball mill, which is very important.
Disclosure of Invention
In order to overcome the defects in the background technology, the invention discloses a ball mill control method using an electric lug, which adopts the following technical scheme:
a ball mill control method using electric lugs comprises a ball mill, wherein the ball mill is provided with three bins, namely a coarse grinding bin, a middle grinding bin and a fine grinding bin, electric lugs are correspondingly arranged outside each bin, each electric lug is connected with a control device, and the control device is connected with a material returning device and a feeding device; the control device judges the ore amount in each bin according to each electric lug signal and controls the feeding amount of the material returning device and the feeding device; the control method comprises the following steps:
s1: firstly, calibrating electric lugs corresponding to a rough grinding bin, a middle grinding bin and a fine grinding bin, respectively obtaining current values I1, I2 and I3 corresponding to each electric lug in a serious excess state, an optimal material level state and a serious deficiency state, and storing the current values in a control device;
s2: if the average current value of the electric lug in unit time is I and the excess coefficient of the electric lug is K, K = (I-I2)/(I2-I1) when I1 is not less than I < I2; when I = I2, K = 0; when I2 < I.ltoreq.I 3, K = (I-I2)/(I3-I2); setting the excess coefficients of the electric lugs corresponding to the rough grinding bin, the middle grinding bin and the fine grinding bin as K1, K2 and K3 respectively, and judging that the ore amount in each bin is in an excess state when K1, K2 and K3 are more than or equal to-1 and less than 0; when K1, K2 and K3=0, the ore amount in each bin is judged to be in a proper state; when the ore quantity in each bin is more than 0 and less than or equal to 1, K1, K2 and K3 are judged to be in a shortage state; setting the total excess coefficient to K0, K0= K1+ K2+ K3;
s3: the total feeding amount in unit time is G, the original total feeding amount is G0,
obtaining G according to a formula G = (1 + K0) × G0, stopping feeding when G is less than or equal to 0, and returning to S2;
s4: setting the current feeding amount in unit time as A and the current returning amount as B; the original feeding amount in unit time is A0;
according to a = a0 (1 + K1), B = G-a0 (1 + K1);
obtaining the current feeding amount A and the current returning amount B;
s5: the control device controls the feeding amount of the material returning device and the feeding device according to the current feeding amount A and the current returning amount B, and then returns to the S2 for circulation.
Further improve technical scheme, feeder includes vibratory feeder and weighing conveyer belt.
Further improve technical scheme, return device includes grader, vibratory feeder and weighing conveyer belt.
Further improve technical scheme, controlling means includes the PLC controller.
Due to the adoption of the technical scheme, compared with the background technology, the invention has the following beneficial effects:
according to the invention, the feeding amount and the returning amount can be automatically adjusted according to the excessive coefficient of the ore in each bin, so that on one hand, the problem that one bin of the ball mill is over-saturated while the other bin of the ball mill is hungry is solved, and the overall grinding efficiency is improved; on the other hand, the rapid abrasion caused by the collision of the grinding body and the lining plate is avoided.
The invention marks the optimal material level of each bin, and in the period time, the excessive coefficient of each bin is self-fed back and corrected, so that the ore amount of each bin tends to the optimal material level, and the overall grinding efficiency of the ball mill is improved.
The invention reduces the labor intensity of operators and saves the energy consumption.
Drawings
FIG. 1 is a schematic view of the structure of a ball mill according to the present invention.
Fig. 2 is a block diagram of a calculation flow of the electric ear excess coefficient of each bin.
FIG. 3 is a block diagram of the flow of the calculation of the feed amount and the return amount.
In the figure: 1. a coarse grinding bin; 2. a middle grinding bin; 3. finely grinding the bin; 4. an electric ear; 5. a feeding device; 6. a material returning device.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
An 800kw mining ball mill, as shown in fig. 1, has three bins, a rough grinding bin 1, a middle grinding bin 2 and a fine grinding bin 3. Outside each bin, an electric lug 4 is correspondingly arranged. Each electric lug 4 is connected with a control device, and the control device is connected with a material returning device 6 and a feeding device 5. The control device comprises a PLC (programmable logic controller), and the PLC can judge the ore amount in each bin according to each electric lug 4 signal and control the feeding amount of the material returning device 6 and the feeding device 5.
The feeding device 5 comprises a vibratory feeder and a weighing conveyer belt and is used for feeding the ore particles crushed in the previous process into the ball mill according to weight. The PLC controls the amplitude of the vibration feeder through current to adjust the feeding amount of the vibration feeder. The weighing conveyer belt weighs the ore particles, feeds back a weighing signal to the PLC, and then sends the ore particles into the ball mill.
The material returning device 6 comprises a classifier, a vibration feeder and a weighing conveyer belt and is used for returning the mineral aggregate with larger particles in the discharge of the ball mill into the ball mill according to the weight and regrinding the mineral aggregate. The grader is used for grading the discharged material of the ball mill. The vibratory feeder and the weighing conveyer belt function as described above.
The three storehouses of ball mill are used for grinding ore particles step by step, and three storehouses intercommunication, ore particles flow out in order from thick to thin. After the feed ore particles are ground by the coarse grinding bin 1, the volume of the feed ore particles is reduced, and the feed ore particles can enter the middle grinding bin 2 through a first grate; after the ore particles in the middle grinding bin 2 are ground, the volume of the ore particles is continuously reduced, and the ore particles can enter the fine grinding bin 3 through a second grid; after the ore particles in the fine grinding bin 3 are ground, the volume of the ore particles is continuously reduced, and the ore particles can be discharged out of the grinding machine body through a third grid. In general, the phenomenon of "overfull" occurs in the first two chambers, in particular the rough grinding chamber 1, while the phenomenon of "starvation" occurs in the latter two chambers, in particular the fine grinding chamber 3. In order to solve the phenomena of 'over-saturation' and 'hungry' of the ball mill, the invention discloses a control method which comprises the following steps:
example 1:
in the embodiment, the EBO-M801 type electric ear 4 is adopted, the acoustic measurement range is 80-140db, and the corresponding output current is 4-20 mA. The output current is collected by the DCS system and is transmitted to the PLC through the signal conversion module.
S1: before the ball mill is put into use, the electric lugs 4 corresponding to the rough grinding bin 1, the middle grinding bin 2 and the fine grinding bin 3 need to be calibrated respectively to obtain current values I1, I2 and I3 corresponding to the electric lugs 4 in a serious excess state, an optimal material level state and a serious shortage state. The measured values of I1=5mA, I2=12mA and I3=17mA of the electric ear 4 corresponding to the rough grinding chamber 1, I1=6mA, I2=11mA and I3=15mA of the electric ear 4 corresponding to the middle grinding chamber 2, and I1=5mA, I2=10mA and I3=14mA of the electric ear 4 corresponding to the fine grinding chamber 3 were stored in the PLC controller.
S2: at a certain time, if the average current value I =8mA of the electric ear 4 of the rough grinding bin 1 in 20min, K1= (I-I2)/(I2-I1) = (8-12)/(12-5) = -0.57; when the average current value I =10mA of the electric ear 4 of the middle grinding bin 2 in 20min, K2= (I-I2)/(I2-I1) = (10-11)/(11-6) = -0.2; when the average current value I =11mA of the electric ear 4 of the fine grinding bin 3 in 20min, K3= (I-I2)/(I3-I2) = (11-10)/(14-10) = 0.25. Since K1 is more than or equal to-1 and K2 is less than 0, the ore amount in the rough grinding bin 1 and the middle grinding bin 2 is judged to be in an excessive state; since K3 is more than 0 and less than or equal to 1, the ore amount in the fine grinding bin 3 is judged to be in an insufficient state; the total excess factor K0= K1+ K2+ K3= -0.52, indicating that the total ore volume of the mill is in an excess state.
S3: setting the total feeding amount in unit time as G, the original total feeding amount as G0, G0=120kg/min,
g =57.6kg/min was obtained from the formula G = (1 + K0) × G0= (1-0.52) × 120;
s4: setting the current feeding amount in unit time as A and the current returning amount as B; the raw material feeding amount in unit time is A0=100kg/min, and the raw material returning amount is B0=20 kg/min;
A=A0*（1+K1），B=G-A=G-A0*（1+K1）；
obtaining the current feeding amount A =43kg/min and the current returning amount B =14.6 kg/min;
s5: during the next 20min period, the PLC controller adjusted the feed device 5 to feed at 43kg/min and the return device 6 to feed at 14.6kg/min, and then returned to S2 for circulation.
The significance of the above adjustment is that the total feeding amount, especially the feeding amount of the ore particles, is reduced, so that the material level of the rough grinding bin 1 tends to be in an optimal state; because the granularity of return charge ore granule is little, can not grind through corase grind storehouse 1, and get into middling mill storehouse 2 or fine grinding storehouse 3, consequently, increase the return charge proportion in the total feed volume, make return charge ore granule get into fine grinding storehouse 3 fast, guarantee that fine grinding storehouse 3 has suitable ore volume, be favorable to avoiding the quick wearing and tearing of rinding body and welt in the fine grinding storehouse 3.
Example 2:
the control method according to embodiment 1 is different from embodiment 1 in that:
s2: at a certain moment, if the average current value I =7mA of the electric ear 4 of the rough grinding bin 1 in 20min, K1= (I-I2)/(I2-I1) = (7-12)/(12-5) = -0.72; when the average current value I =9mA of the electric ear 4 of the middle grinding bin 2 in 20min, K2= (I-I2)/(I2-I1) = (9-11)/(11-6) = -0.4; since K1 is more than or equal to-1 and K2 is less than 0, the ore amount in the rough grinding bin 1 and the middle grinding bin 2 is judged to be in an excessive state; the average current value I = I2=10mA of the electric ear 4 of the fine grinding chamber 3 in 20min, then K3=0. Since K3=0, it is determined that the ore amount in the fine grinding silo 3 is in an appropriate state; the total excess factor K0= K1+ K2+ K3= -1.12, indicating that the total ore volume of the mill is in a severe excess state.
S3: setting the total feeding amount in unit time as G, the original total feeding amount as G0, G0=120kg/min,
and G = (1 + K0) × G0 to obtain G = -14.4 kg/min, and the PLC stops the feeding device 5 and the material returning device 6 to feed because G is less than or equal to 0 and returns to S2.
The significance of the above adjustment is that the overall ore volume of the mill is in a severe excess condition, the feed is stopped, the mill is allowed to digest the excess ore for a period of time, and then the excess factor is returned to S2 to re-check each bin.
Example 3:
the control method according to embodiment 1 is different from embodiment 1 in that:
s2: at a certain moment, if the average current value I =11mA of the electric ear 4 of the rough grinding bin 1 in 20min, K1= (I-I2)/(I2-I1) = (11-12)/(12-5) = -0.14; when the average current value I of the electric ear 4 of the middle grinding bin 2 in 20min is =11.5mA, K2= (I-I2)/(I3-I2) = (11.5-11)/(15-11) = 0.16; when the average current value I =11mA of the electric ear 4 of the fine grinding bin 3 in 20min, K3= (I-I2)/(I3-I2) = (11-10)/(14-10) = 0.25. Since K1 is more than or equal to-1 and less than 0, the ore amount in the rough grinding bin 1 and the middle grinding bin 2 is judged to be in an excessive state; since K2 is more than 0 and K3 is less than or equal to 1, the ore amount in the fine grinding bin 3 is judged to be in an insufficient state; the total excess factor K0= K1+ K2+ K3=0.27, indicating that the total ore charge of the mill is in an underrun condition.
S3: setting the total feeding amount in unit time as G, the original total feeding amount as G0, G0=120kg/min,
g =152.4kg/min was obtained from the formula G = (1 + K0) × G0= (1 + 0.27) × 120;
s4: setting the current feeding amount in unit time as A and the current returning amount as B; the raw material feeding amount in unit time is A0=100kg/min, and the raw material returning amount is B0=20 kg/min;
A=A0*（1+K1），B=G-A=G-A0*（1+K1）；
obtaining the current feeding amount A =86kg/min and the current returning amount B =66.4 kg/min;
s5: during the next 20min period, the PLC controller adjusted the feed device 5 to feed at 111.8kg/min and the return device 6 to feed at 40.6kg/min, and then returned to S2 for circulation.
The significance of the adjustment lies in that the total feeding amount, especially the returning amount, is increased, so that the returning ore particles quickly enter the middle grinding bin 2 and the fine grinding bin 3, the proper ore amount of the middle grinding bin 2 and the fine grinding bin 3 is ensured, on one hand, the quick abrasion of a grinding body and a lining plate in the fine grinding bin 3 is avoided, on the other hand, the material level of the middle grinding bin 2 and the fine grinding bin 3 tends to the optimal state, and the grinding efficiency is improved. The feeding amount of ore particles is reduced, the grinding pressure of the rough grinding bin 1 is relieved, and the material level of the rough grinding bin 1 tends to be in the optimal state. When the material level of the rough grinding bin 1 is in the best state, the grinding efficiency is highest, and the ore amount of the middle grinding bin 2 can be increased rapidly.
Fig. 2 is a block diagram of a calculation flow of the electric lug excess coefficient of each bin, and fig. 3 is a block diagram of a calculation flow of a feeding amount and a return amount. It can be seen that the above 3 embodiments can be automatically completed under the control of the PLC controller, and can circulate automatically within a period of time to continuously correct the feeding amount and the returning amount.
The present invention is not described in detail in the prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A ball mill control method using electric lugs comprises a ball mill, wherein the ball mill is provided with three bins, namely a coarse grinding bin, a middle grinding bin and a fine grinding bin, and is characterized in that: electric lugs are correspondingly arranged outside each bin, each electric lug is connected with a control device, and the control device is connected with a material returning device and a feeding device; the control device judges the ore amount in each bin according to each electric lug signal and controls the feeding amount of the material returning device and the feeding device; the control method comprises the following steps:
s1: firstly, calibrating electric lugs corresponding to a rough grinding bin, a middle grinding bin and a fine grinding bin, respectively obtaining current values I1, I2 and I3 corresponding to each electric lug in a serious excess state, an optimal material level state and a serious deficiency state, and storing the current values in a control device;
s2: if the average current value of the electric lug in unit time is I and the excess coefficient of the electric lug is K, K = (I-I2)/(I2-I1) when I1 is not less than I < I2; when I = I2, K = 0; when I2 < I.ltoreq.I 3, K = (I-I2)/(I3-I2); setting the excess coefficients of the electric lugs corresponding to the rough grinding bin, the middle grinding bin and the fine grinding bin as K1, K2 and K3 respectively, and judging that the ore amount in each bin is in an excess state when K1, K2 and K3 are more than or equal to-1 and less than 0; when K1, K2 and K3=0, the ore amount in each bin is judged to be in a proper state; when the ore quantity in each bin is more than 0 and less than or equal to 1, K1, K2 and K3 are judged to be in a shortage state; setting the total excess coefficient to K0, K0= K1+ K2+ K3;
s3: the total feeding amount in unit time is G, the original total feeding amount is G0,
obtaining G according to a formula G = (1 + K0) × G0, stopping feeding when G is less than or equal to 0, and returning to S2;
s4: setting the current feeding amount in unit time as A and the current returning amount as B; the original feeding amount in unit time is A0;
according to a = a0 (1 + K1), B = G-a0 (1 + K1);
obtaining the current feeding amount A and the current returning amount B;
s5: the control device controls the feeding amount of the material returning device and the feeding device according to the current feeding amount A and the current returning amount B, and then returns to the S2 for circulation.
2. A method for controlling a ball mill using an electric lug as set forth in claim 1, wherein: the feeding device comprises a vibration feeder and a weighing conveyer belt.
3. A method for controlling a ball mill using an electric lug as set forth in claim 1, wherein: the material returning device comprises a grader, a vibration feeder and a weighing conveyer belt.
4. A method for controlling a ball mill using an electric lug as set forth in claim 1, wherein: the control device comprises a PLC controller.
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Application publication date: 20200811 |
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