JPH0724353A - A method for controlling the amount of ore supply based on the grinding noise of a mill grinder - Google Patents

Abstract

(57) [Summary] [Purpose] The mill crusher stabilizes the amount of ore supply without causing idling or overloading and enables automatic control.
A method of controlling the amount of ore supplied by the grinding noise of a mill grinder is provided. [Structure] The crushing sound of the mill picked up by the microphone 1 is converted and amplified into an electric signal through the conversion amplifier 2, and from its output,
Each of them is provided with a first signal detector 4 having a band filter a for detecting the collision sound of the crushing balls of the mill crusher, and a filter b of a predetermined band including the band of the filter a and wider than that. The respective signals are detected by the second signal detector 5, and the controller 3 controls the amount of ore supply so that the ratio of the two signals obtained by the ratio calculator 6 falls within a predetermined range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the amount of ore supplied by the grinding noise of a mill grinder, and more particularly to a control method for stabilizing the amount of ore supplied.

[0002]

2. Description of the Related Art A system diagram of an apparatus used in a conventional ore supply control method is shown in FIG. The crushing sound of the mill crusher is picked up by the microphone 1 and converted into an electric signal. The output of the microphone 1 is amplified by the conversion amplifier 2, and the output signal thereof is input to the controller 3 for the amount of ore supply to control the amount of ore supply. That is, it is converted into an electric signal proportional to the loudness of the sound generated from the mill crusher, and this signal controls the amount of ore supplied.

That is, when the output signal becomes small to some extent, this is because the amount of crushing is large, and therefore the amount of ore supplied is decreased, and conversely, when the output signal becomes somewhat large, the amount of ore is increased.

[0004]

In the above-mentioned conventional ore supply amount control method, the ore supply amount is converted by this signal converted into an electric signal proportional to the magnitude of the sound generated from the mill grinder as described above. It was a control and could not completely grasp the crushing status of the mill crusher. In other words, the idle operation (no load) or overload condition of the mill crusher cannot be detected, and depending on the situation of crushing noise, hunting may occur in the ore feed rate control system and the ore feed rate may become unstable. There was an operational problem that the quantity was reduced and the product quality was deteriorated.

It is an object of the present invention to solve this problem and to provide a method for controlling the amount of ore supplied by the crushing sound of a mill crusher which is capable of stable operation of the mill and has excellent characteristics of the amount of ore supplied. is there.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by collecting the grinding noise of a mill grinder and converting it into an electric signal, and supplying the electric signal level to the mill grinder. The following method was adopted as applied to the method of controlling the amount of ore supplied by the crushing noise of the mill crusher that determines the state of ore and controls the amount of ore supplied. That is, the output of the electric signal is divided into two systems, a signal level of a predetermined bandwidth is detected in the first system, and a signal level of a predetermined wide band including the bandwidth is detected in the second system. Detecting and controlling the feed rate so that the level ratio between the first detection signal level and the second detection signal level falls within a predetermined range. It is a quantity control method.

[0007]

When the mill crusher is unloaded (idling), the crushing balls collide with each other and sound in the frequency band peculiar to the crusher is generated. Conventionally, only the sound level was focused on, and by this, the control was made so as to judge the idling and control so as to supply the iron. However, in the conventional method, the so-called controller has high sensitivity and causes hunting. Analyzes the noise generated by the mill depending on the amount of ore in the mill from the operation results of the mill, and during stable operation, the level ratio between the first detection signal level and the second detection signal level is within a certain range. I found that it is in.

That is, the first detection signal is a frequency band generated by collision of the grinding balls with each other, and the output of the second signal detector is an audible frequency band including the frequency band of the first signal detector. There is. The frequency band width of the first detection signal differs depending on the mill. Therefore, when the level ratio P between the first detection signal and the second detection signal is obtained, generally, when P >> 1, it is during idling, and when P << 1, it is during overload.

In the present application, the value of P is set within a predetermined range determined by the mill, and the ore supply amount is controlled so that the value of P is within the set range. Strictly speaking, the value of P varies depending on individual mills and the properties of the ore (particle size, hardness, etc.), but when the same mill is used, the particle size and hardness of the ore are Even if is slightly changed, the value of P can be regarded as indicating the pulverization state of the mill.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a system diagram of an ore supply amount control apparatus of one embodiment in which the present invention can be preferably implemented. Two systems of outputs of the conventional conversion amplifier 2 shown in FIG. 2 are provided and connected to the first signal detector 4 and the second signal detector 5, respectively. The first signal detector 4 is provided with a first band-pass filter of 3 ± 1.0 KHz for detecting the sound generated by the collision of the crushing balls, and the second signal detector 5 is 0.1 to 10%. 10KH
A second bandpass filter of z is provided.

The outputs of the first signal detector 4 and the second signal detector 5 are the ratio calculator 6 for calculating the ratio P of the output of the first signal detector 4 and the output of the second signal detector 5. Entered in
The output of the ratio calculator 6 is input to the controller 3 to control the amount of ore supply. In this example, P was controlled to be a constant value in the range of 10>P> 0.

According to the present invention, the amount of ore supplied is stabilized without causing an idle operation or an overload condition in the mill crusher, so that automatic control is possible. Furthermore, since the operation can be stabilized and the proper load can be maintained, the distribution width of the fineness of the product can be reduced and the quality can be stabilized.

[0013]

INDUSTRIAL APPLICABILITY The present invention enables unmanned mill operation, and stabilizes the control of the amount of ore supplied to improve the product quality, so that it is extremely excellent in labor saving and productivity improvement. Produce the effect.

[Brief description of drawings]

FIG. 1 is an explanatory view of an apparatus system of an embodiment in which the present invention can be preferably implemented.

FIG. 2 is an explanatory diagram of a system of a conventional example.

[Explanation of symbols]

 1 Microphone 2 Conversion amplifier 3 Controller 4 First signal detector 5 Second signal detector 6 Ratio calculator

Claims (1)

[Claims] 1. A crusher for crushing mill, which collects a crushing sound of a crusher and converts it into an electric signal, and judges the state of ore supply to the crusher based on the level of the electric signal to control the amount of ore supplied. In the method of controlling the amount of ore supplied by sound, the output of the electric signal is divided into two systems, a signal level of a predetermined bandwidth is detected in the first system, and a predetermined level including the bandwidth is detected in the second system. Of a wide band width, and controlling the feed rate so that the level ratio between the first detection signal level and the second detection signal level falls within a predetermined range. A method for controlling the amount of ore supplied by the crushing sound of a machine.