JPH07284687A - Raw material supply controller of pulverizing equipment - Google Patents

Abstract

PURPOSE:To surely maintain the load state of respective ball mills at an optimum state by checking the pulverizing material supply rate to the respective ball mills actually distributed by a distributor in accordance with the pulverizing material supply rate signals from a distribution flow meter with an overall arithmetic and logic unit and executing the feedback relating to the distribution ratio control of the distributor. CONSTITUTION:The pulverizing material supply rates to the respective ball mills 5, 6 actually distributed by the distributor 4 are checked in accordance with the pulverizing material supply rate signal 26 from the distribution flow meter 27 and the feedback control relating to the distribution ratio control of the distributor 4 is executed in the overall arithmetic and logic unit. The raw material supply rate signal 28 from a raw material supplying machine 1 is utilized as a feedback signal relating to the raw material supply rate control by a raw material supply rate arithmetic and logic unit 24. Then, the discrete adjustment of the pulverizing material supply rates to the respective ball mills 5, 6 is made possible according to the loading states of the respective ball mills 5, 6 and, therefore, the loading states of the respective ball mills 5, 6 are maintained at the optimum state. The pulverizing efficiency of the pulverizing equipment 7 is thus improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raw material supply control device for crushing equipment.

[0002]

2. Description of the Related Art A raw material is roughly crushed by a preliminary crusher such as a vertical roller mill having a high crushing ability, and the crushed material from the preliminary crusher is distributed to a pair of ball mills having a high fine crushing ability for finish crushing. Such crushing equipment is conventionally known.

FIG. 3 shows an example of a conventional raw material supply control device in such a crushing facility. As shown in the drawing, a preliminary crusher 3 for roughly crushing the raw material 2 from the raw material feeder 1 and the preliminary crusher. The crushing equipment 7 is constituted by the ball mills 5 and 6 for finishing and crushing the crushed product 2 ′ evenly distributed from the ball mills 3 and 3 through the distributor 4, and the crushing equipment 7 is emitted near the ball mills 5 and 6 by the finish crushing. Acoustic sensors 8 and 9 for detecting the crushing sound are respectively arranged, and the acoustic levels detected by the acoustic sensors 8 and 9 are input to the calculator 12 as load state quantity signals 10 and 11, and the calculator 12 outputs The control signal 13 is calculated so that the sum of the load state quantities of the ball mills 5 and 6 judged from the load state quantity signals 10 and 11 is held at a predetermined set value, and the control signal 13 causes the raw material feeder 1 to operate. Drive The feed rate of the raw material is controlled by adjusting the rotation speed of the dynamic motor.

That is, since the sound level of the crushing sound of each ball mill 5 and 6 changes according to the load condition, the correspondence between the sound level of the crushing sound and the load condition of each ball mill 5 and 6 is investigated beforehand. By inputting the corresponding relationship data into the arithmetic unit 12, the load condition of each ball mill 5, 6 is quantitatively judged from the sound level of the crushing sound, and when the load condition of each ball mill 5, 6 is optimum. The raw material supply amount is controlled by using the sum of the load state amounts based on the detected sound level as a set value.

[0005]

However, in such a conventional apparatus, since the ball mills 5 and 6 of the same kind are equally distributed, it is premised that the load states of the ball mills 5 and 6 are synchronized. The ball mills 5 and 6 have slightly different unique mechanical characteristics, and the crushed product 2 ′ from the preliminary crusher 3 is in a state in which the particle size and properties are biased. In many cases, the load states of the ball mills 5 and 6 may change individually because the distribution is often done in the above. Moreover, such a change in the load state is not limited to a temporary change. ,
The operation of the crushing facility 7 tends to be accumulated over a long period of time.

Because, as shown in FIG. 4, the pulverized product 2 "discharged from the ball mills 5 and 6 is guided to the classifier 14 and classified into the fine powder 2a and the coarse powder 2b, and the finely ground fine powder is obtained. Only the powder 2a is collected as a product by the transportation machine 15 and the coarse powder 2b, which is not sufficiently crushed, is re-supplied to the inlet side of the ball mills 5 and 6 via the transportation machine 16 and the like. If the ball mills 5 and 6 are overloaded and the crushing efficiency is lowered, the re-supply amount (return amount) of the coarse powder 2b is naturally increased, and the ball mill 5, 5 is increased by the increase of the re-supply amount of the coarse powder 2b. This is because the overload state of 6 will be continued.

Therefore, in the conventional device, the load state quantity signal 1
Even if the sum of the load state amounts of the ball mills 5 and 6 judged from 0 and 11 is held at a predetermined set value, for example, one ball mill 5 is in an overload state beyond its capacity and the other ball mill 6 is In some cases, the following useless low-load conditions may occur, so each ball mill 5,
There is a possibility that the individual load states of the ball mills 5 and 6 cannot be kept in the optimum state only by controlling the raw material supply amount so that the total of the load state amounts of No. 6 is kept at a predetermined set value. .

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a raw material supply control device for a crushing facility which can surely maintain the load state of each ball mill in an optimum state.

[0009]

DISCLOSURE OF THE INVENTION The present invention comprises a preliminary crusher for roughly crushing a raw material from a raw material supply machine, and a pair of ball mills for finishing crushing a pulverized material distributed from the preliminary crusher through a distributor. A raw material supply control device for a crushing facility equipped with, and a detector for detecting the load state of each ball mill,
Based on the load state quantity signal from the detector, the pulverized material supply amount for calculating and outputting an increase / decrease command signal for increasing or decreasing the pulverized material supply amount to each ball mill so as to maintain the load state of each ball mill in an optimum state A calculator and a preliminary crusher which outputs a distribution ratio signal calculated based on an increase / decrease command signal from the crushed material supply amount calculator to the distributor and which corresponds to an increase / decrease of the crushed product which cannot be handled by the distribution ratio control of the distributor. Of a raw material supply device based on a total arithmetic unit for calculating and outputting a total amount increase / decrease command signal for increasing / decreasing the raw material supply amount, and a control signal calculated based on the total amount increase / decrease command signal from the general arithmetic unit A raw material supply amount calculator that controls the supply amount, and a distribution flowmeter that detects the pulverized product supply amount of each ball mill actually distributed by the distributor and feeds back the pulverized product supply amount signal to the integrated calculator. Be prepared It is an butterfly.

[0010]

According to the present invention, therefore, the load condition of each ball mill is detected by the detector, and the load condition amount signals for quantitatively judging the load condition are input to the respective crushed product supply amount calculators. In the quantity calculator, an increase / decrease command signal for increasing / decreasing the pulverized material supply amount to each ball mill is calculated so as to maintain the load state of each ball mill in an optimum state, and the increase / decrease command signal is output to the total calculator, and in the total calculator, A distribution ratio signal for adjusting the distribution ratio of the distributor is calculated based on the increase / decrease command signals and output to the distributor.

At this time, if there is an increase / decrease in the amount of pulverized material that cannot be handled by the distribution ratio control of the distributor, a total amount increase / decrease command signal for increasing / decreasing the amount of raw material supplied to the preliminary crusher is issued by the general arithmetic unit. The raw material supply amount is calculated and output to the raw material supply amount arithmetic unit, and the raw material supply amount is controlled by the raw material supply amount arithmetic unit by a control signal calculated based on the total amount increase / decrease command signal from the general arithmetic unit. It

Further, in the total computing unit, the pulverized material supply amount to each ball mill actually distributed by the distributor is confirmed based on the pulverized material supply amount signal from the distribution flow meter, and the distribution of the distributor is performed. Feedback control related to the ratio control is performed.

By the above control, the amount of pulverized material supplied to each ball mill is individually adjusted according to the load state of each ball mill detected by the detector, and the load state of each ball mill is maintained in the optimum state.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the raw material supply control device of the present invention, and the parts denoted by the same reference numerals as in FIG. 3 represent the same parts.

Similar to the conventional example shown in FIG. 3, the preliminary crusher 3 for roughly crushing the raw material 2 from the raw material supply device 1 and the crushed product uniformly distributed from the preliminary crusher 3 through the distributor 4 A crushing equipment 7 is constituted by a pair of ball mills 5 and 6 for finishing and crushing 2 ', and acoustic sensors 8 and 9 (detection) for detecting a crushing sound generated by the finish crushing are provided in the vicinity of the ball mills 5 and 6, respectively. Are provided respectively.

However, in this embodiment, the acoustic sensors 8 and 9 are
The acoustic level detected by the load state quantity signal 10, 1
1 is input to separate pulverized material supply amount calculators 17 and 18, respectively.
In 7 and 18, the increase / decrease command signals 19 and 20 for increasing / decreasing the amount of pulverized material supplied to the ball mills 5 and 6 are calculated so as to keep the load states of the ball mills 5 and 6 in the optimum state, and the integrated calculator 21 is calculated. It is intended for output.

That is, since the sound level of the crushing sound of each ball mill 5 and 6 changes according to the load condition, the correspondence between the sound level of the crushing sound and the load condition of each ball mill 5 and 6 is investigated in advance. By inputting the corresponding relationship data into the crushed material supply amount calculators 17 and 18, the load states of the ball mills 5 and 6 can be determined from the sound level of the crushing sound in the crushed material supply amount calculators 17 and 18. Judge quantitatively,
The increase / decrease command signals 19 and 20 for correcting the excess or deficiency of the load state amount based on the acoustic level detected when the load states of the ball mills 5 and 6 are in the optimum state are calculated and output to the general calculator 21. I am doing it.

Further, in the total calculator 21, the distribution ratio signal 22 calculated based on the increase / decrease command signals 19 and 20 from the pulverized material supply amount calculators 17 and 18 is output to the distributor 4. The total amount increase / decrease command signal 23 for increasing / decreasing the raw material supply amount to the preliminary crusher 3 is calculated according to the increase / decrease of the pulverized material 2'which cannot be handled by the distribution ratio control of the distributor 4, and the raw material supply amount calculator 24 is operated. It is intended for output.

In the raw material supply amount calculator 24, the raw material supply amount is controlled by adjusting the rotation speed of the drive motor of the raw material supply machine 1 based on the total amount increase / decrease command signal 23 from the general arithmetic unit 21. The control signal 25 for the calculation is calculated and output to the raw material feeder 1.

Further, between the distributor 4 and the one ball mill 5, the crushed material supply amount to the one ball mill 5 actually distributed by the distributor 4 is detected to detect the crushed material supply amount signal 2.
A distributed flow meter 27 for feeding back 6 to the general computing unit 21 is provided.

The distribution flowmeter 27 is preferably arranged individually between the distributor 4 and each of the ball mills 5 and 6, but as in the illustrated example, for example, the raw material feeder 1 is used as a scale conveyor for raw materials. By inputting the raw material supply amount signal 28 indicating the supply amount from the raw material supply device 1 to the general computing unit 21, even if the distribution flow meter for detecting the supply amount of the pulverized material to the other ball mill 6 is omitted, The pulverized material supply amount to the other ball mill 6 can be calculated from the raw material supply amount by the total arithmetic unit 21.

Further, as in the illustrated example, the raw material feeder 1
The raw material supply amount signal 28 may be used as a feedback signal of the raw material supply amount calculator 24 by passing the raw material supply amount signal 28 from the raw material supply amount calculator 24 through the raw material supply amount calculator 24.

Then, the crushing sounds of the ball mills 5 and 6 are detected by the respective acoustic sensors 8 and 9, and the acoustic level thereof is used as the load state quantity signals 10 and 11, respectively, and the crushed material supply amount calculator 1
When input to 7 and 18, respectively, each pulverized material supply amount calculator 1
In 7 and 18, the increase / decrease command signals 19 and 20 for increasing / decreasing the amount of pulverized material supplied to the ball mills 5 and 6 are calculated so as to keep the load states of the ball mills 5 and 6 in the optimum state, and the integrated calculator 21 is calculated. The integrated computing unit 21 computes a distribution ratio signal 22 for adjusting the distribution ratio of the distributor 4 based on the increase / decrease command signals 19 and 20, and outputs it to the distributor 4.

At this time, when there is an increase / decrease in the pulverized material 2'which cannot be dealt with by the distribution ratio control of the distributor 4, that is, each of the increase / decrease command signals 19 and 20 increases or decreases the pulverized material supply amount. When the increase / decrease command signals 19 and 20 cannot be offset as in the case of requesting, the total amount for increasing / decreasing the raw material supply amount to the preliminary crusher 3 in the general arithmetic unit 21. The increase / decrease command signal 23 is calculated and output to the raw material supply amount calculator 24. By the control signal 25 calculated by the raw material supply amount calculator 24 based on the total amount increase / decrease command signal 23 from the general calculator 21. The rotation speed of the drive motor of the raw material feeder 1 is adjusted to control the raw material supply amount.

Further, in the total arithmetic unit 21, the pulverized material supply amount to each of the ball mills 5, 6 actually distributed by the distributor 4 is confirmed based on the pulverized material supply amount signal 26 from the distribution flow meter 27. Then, feedback control regarding the distribution ratio control of the distributor 4 is performed.

The raw material supply amount signal 28 from the raw material supply device 1 is used as a feedback signal for controlling the raw material supply amount by the raw material supply amount calculator 24.

Therefore, according to the above embodiment, the amount of pulverized material supplied to each ball mill 5, 6 can be individually adjusted according to the load state of each ball mill 5, 6, so that the load of each ball mill 5, 6 can be adjusted. The state can be reliably maintained in the optimum state, and the pulverization efficiency of the pulverization equipment 7 can be significantly improved as compared with the conventional case.

Further, in the above-described embodiment, the example in which the load states of the ball mills 5 and 6 are detected by using the acoustic sensors 8 and 9 has been shown, but the detectors that detect the load states of the ball mills 5 and 6 are shown. In addition to the acoustic sensors 8 and 9, it is possible to employ various detectors capable of outputting signals having a corresponding relationship with the load states of the ball mills 5 and 6, and as shown in FIG. , Transporters 15, 16 for transporting the refined powder 2a or the coarse powder 2b classified by the classifier 14.
Torque detectors 29, 30 for detecting the drive motor load of
Torque detector 3 for detecting the drive motor load of the classifier 14
1. Fine powder 2a or coarse powder 2b classified by classifier 14
It is possible to adopt flowmeters 32, 33, etc. for detecting the flow rate of the above in place of the acoustic sensor.

The raw material supply control device of the crushing equipment of the present invention is not limited to the above-mentioned embodiment, and a distribution flow meter may be individually arranged between the distributor and each ball mill. In that case, it is not necessary to input the raw material supply amount signal from the raw material supply unit to the general arithmetic unit, and the raw material supply amount of the raw material supply unit is controlled by the control signal from the raw material supply amount arithmetic unit. It is not necessary to feed back the raw material supply amount signal to the raw material supply amount calculator when it can be expected to reliably control the above, and other various modifications can be made without departing from the scope of the present invention. Is.

[0031]

According to the raw material supply control device for the crushing equipment of the present invention described above, the amount of crushed material supplied to each ball mill can be adjusted individually according to the load state of each ball mill. It is possible to achieve the excellent effect that the load condition can be reliably maintained in the optimum condition and the crushing efficiency of the crushing equipment can be significantly improved as compared with the conventional case.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

FIG. 2 is a schematic view showing another embodiment of the present invention.

FIG. 3 is a schematic view showing a conventional example.

FIG. 4 is a schematic view showing a peripheral configuration of the ball mill shown in FIG.

[Explanation of symbols]

 1 Raw Material Supply Machine 2 Raw Material 2'Crushed Material 3 Preliminary Crusher 4 Distributor 5 Ball Mill 6 Ball Mill 7 Crushing Equipment 8 Acoustic Sensor (Detector) 9 Acoustic Sensor (Detector) 10 Load State Quantity Signal 11 Load State Quantity Signal 17 Grinding Material supply amount calculator 18 Crushed material supply amount calculator 19 Increase / decrease command signal 20 Increase / decrease command signal 21 Overall calculator 22 Distribution ratio signal 23 Overall amount increase / decrease command signal 24 Raw material supply amount calculator 25 Control signal 26 Crushed material supply amount signal 27 Distributed flowmeter 28 Raw material supply amount signal 29 Torque detector (detector) 30 Torque detector (detector) 31 Torque detector (detector) 32 Flowmeter (detector) 33 Flowmeter (detector)

Claims (1)

[Claims] 1. A raw material for a crushing facility comprising a preliminary crusher for roughly crushing a raw material from a raw material feeder and a pair of ball mills for finishing crushing a crushed product distributed from the preliminary crusher through a distributor. A supply control device, a detector for detecting the load state of each ball mill, and a pulverized material supply to each ball mill so as to maintain the load state of each ball mill in an optimum state based on the load state amount signal from the detector. A pulverized material supply amount calculator for calculating and outputting an increase / decrease command signal for increasing / decreasing the amount, and a distribution ratio signal calculated based on the increase / decrease command signal from the pulverized material supply amount calculator for output to the distributor, Comprehensive computing unit that computes and outputs the total amount increase / decrease command signal for increasing / decreasing the amount of raw material supply to the preliminary crusher according to the increase / decrease of the pulverized material that cannot be handled by the distribution ratio control of the distributor Of the total amount increase / decrease command signal A raw material supply amount calculator for controlling the raw material supply amount of the raw material supply device by a control signal calculated based on
A raw material supply for a crushing facility, which is equipped with a distribution flow meter that detects the pulverized material supply amount of each ball mill actually distributed by a distributor and feeds back the pulverized material supply amount signal to a general computing unit. Control device.