JPH03186362A - Apparatus for controlling grinding operation - Google Patents

Abstract

PURPOSE:To perform the control corresponding to the actual grinding state of a grinder by controlling the operation state of the grinder by comparing the reference acoustic characteristic generated when the grinder is in a required operation state with the actual acoustic characteristic generated during the grinding operation of the grinder. CONSTITUTION:An actual acoustic characteristic detection means 43 analyzes frequency distribution from the acoustic signal Sr from the microphone 46 arranged in the vicinity of the rotary cylinder of a grinder 10 to output the same as an actual acoustic characteristic Fr. A plurality of reference acoustic characteristics are stored in a reference acoustic characteristic memory means 44 at every conditions such as a grinding particle size or the like and a predetermined reference acoustic characteristic Fn is outputted corresponding to a calling request. An operation state control means 45 reads the reference acoustic characteristic Fn corresponding to the setting of the operation condition of a grinding apparatus 1 set by a control part 41 from the reference acoustic characteristic detection means 44 and the actual acoustic characteristic Fr of the grinder 10 during operation is monitored by the actual acoustic characteristic detection means 43 and the respective characteristics Fn, Fn are compared to extract the difference therebetween and the control part 41 is adjusted so that the actual acoustic characteristic Fr approaches the reference acoustic characteristic Fn.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pulverization operation control device, and can be used to control the operation of a pulverizer used in pulverization operations such as cement production.

[Background technology]

BACKGROUND ART Conventionally, pulverization processing has been carried out in the production of powder products, and various pulverizers are used depending on the target particle size of the pulverized product and the pulverization conditions. Its operation is automated by a control device.

For example, in a sequential processing type pulverizer, depending on the properties such as the hardness of the pulverized raw material input externally and the state such as dryness and wetness,
The crusher is controlled by automatically setting the crushing time and crushing operation until a predetermined particle size is obtained.

Further, in a continuous processing type crusher, the crusher is controlled based on similar conditions by automatically setting the crushing operation and the amount of feed material so that a predetermined particle size is obtained during passage.

[Problem to be solved by the invention]

However, in an in-vehicle crusher, it is difficult to directly check the internal target particle size and particle size distribution during operation. In particular, in a closed-loop pulverizer that includes a classifier or the like, the state of pulverization cannot be determined from the pulverized product taken out.

Therefore, when automatically operating the crusher using the control device,
There is a problem in that it is difficult to perform feedback adjustment based on the actual pulverization state in the pulverizer, and it is not possible to appropriately respond to changes in the state of the pulverized raw material or the state of the pulverizer.

An object of the present invention is to provide a pulverization operation control device that can perform control according to the actual pulverization state of a pulverizer.

[Means to solve the problem]

The present invention provides a reference acoustic characteristic storage means that stores a reference acoustic characteristic that occurs when a crusher is in a desired operating state, and an actual acoustic characteristic that detects an actual acoustic characteristic that occurs while the crusher is in a crushing operation. A pulverizing operation control device is constructed by providing a detecting means and an operating state adjusting means for comparing the actual acoustic characteristic and the reference acoustic characteristic to adjust the operating state of the pulverizer.

Here, as the reference acoustic characteristic, one obtained by subjecting the actually measured acoustics to a predetermined spectrum analysis process, etc. can be used, and appropriate items such as frequency distribution and peak position may be selected. Furthermore, in addition to data based on actual measurements, data obtained by adding calculation adjustment to actual measurement data, completely synthetic data, etc. may be used.

Further, as the reference acoustic characteristic storage means, one that stores a plurality of reference acoustic characteristics corresponding to the pulverization state data such as the particle size and distribution of the pulverized material in the pulverizer in the form of a data table can be adopted. At this time, if condition data representing the nature and state of the pulverized material and the operating state of the pulverizer are also stored, it can be referenced when adjusting the operation of the pulverizer.

Further, the actual acoustic characteristic detection means may be any device that performs the same analysis process on the actual acoustic characteristics as in recording the reference acoustic characteristics and outputs data that can be compared with each other.

Further, as the operating condition adjustment means, for example, a method that searches for a reference acoustic characteristic that substantially matches the actual acoustic characteristic and adjusts the operating condition of the crusher based on condition data such as the operating condition corresponding to that data is used. can.

[For production]

In the present invention, the actual acoustic characteristics of the crusher in operation are detected by the actual acoustic characteristics detection means, and the actual acoustic characteristics are combined with the reference acoustic characteristics stored in the reference acoustic characteristics storage means by the operating condition adjustment means. compare. At this time, the sound from the pulverizer during operation includes not only the operating sound of the pulverizer itself, but also the crushing sound and collision sound of the pulverized material being crushed inside, and the acoustic characteristics are determined by the nature and condition of the pulverized material. It also shows a unique frequency distribution and peak position depending on the particle size, etc. Therefore, by referring to the reference acoustic characteristic corresponding to the actual acoustic characteristic representing the current pulverization state, it is possible to grasp the pulverization state such as the particle size inside the pulverizer from the outside. Therefore, it becomes possible to adjust the operation settings of the crusher according to the crushing state ascertained by the operating condition adjusting means, thereby achieving the above object.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows a pulverizing apparatus 1 that performs closed-loop pulverization centering around a pulverizer IO.

The crusher IO is a transfer medium type tube mill or the like that is rotationally driven by a motor 11, and sequentially finely crushes the crushed raw material supplied from the intake side (left side in the figure) and transfers it to the output side (right side in the figure). Send out continuously.

A conveyance path 21 is arranged on the intake side of the crusher 10.

A blowing fan 22 is connected to the conveyance path 21, and this fan 22 is driven by a motor 23 to generate a flow of air toward the crusher IO. A hopper 25 is connected to the middle of the conveyance path 21 via a supply amount adjustment valve 24.
The pulverized raw material contained in the pulverized material 5 is introduced into the conveyance path 21 in fixed amounts in accordance with the opening degree of the valve 24, and is supplied to the pulverizer 10 by the internal flow.

The take-out side of the crusher IO is connected to a loop-shaped circulation path 31. A circulation fan 32 is arranged in the circulation path 31,
This fan 32 is driven by a motor 33 to generate a flow around the circulation path 31. A classifier 34 and a cyclone separator 35 are disposed in the circulation path 31 between the crusher IO and the fan 32. The classifier 34 is connected to the circulation path 31
The pulverized products from the pulverizer 10, which are conveyed by the flow inside the pulverizer 1, are sorted according to their particle size, and those with a particle size larger than the window (those that are insufficiently pulverized) are returned to the conveying path 21 and transferred to the pulverizer 1.
Grind again at 0. The separator 34 takes out the pulverized products of a predetermined particle size from the pulverized products conveyed from the classifier 33 by the swirling flow, and accumulates them as products in a lower container 36 .

A control device 40 is provided to control the operation of such a crushing device 1.

The control device 40 includes a control section 41 and an operation panel 42 that perform existing open-loop automatic control, and the control section 41 performs the above-described control based on the target particle size, the properties of the pulverized material, etc. that are externally input from the operation panel 42. The rotation state of each motor 11.23° 33 and the opening degree of the supply amount adjustment valve 24 are determined to adjust the crushing operation of the crusher 10 or the flow rate of the crushed material, and the overall operating condition of the crusher l is automatically controlled. Control.

On the other hand, the control device 40 is constructed based on the present invention, and includes an actual acoustic characteristic detecting means 43 and a reference acoustic characteristic storing means 44, and each means 43 and 44 is connected to an operating state adjusting means 45. There is.

The actual acoustic characteristic detection means 43 is an amplification amplifier or FFT.
(Fast Fourier Transform) type spectrum analyzer, etc., to analyze the frequency distribution (see Figure 2) from the acoustic signal S' collected from the microphone 46 placed near the rotating body of the crusher IO. , the actual acoustic characteristic F' is output.

The reference acoustic characteristic storage means 44 stores a plurality of reference acoustic characteristics in advance for each condition such as the pulverized particle size, and outputs a predetermined reference acoustic characteristic Fn in response to a call request specifying the condition such as the pulverized particle size. Here, the reference acoustic characteristics are the crusher 1
This is actual measurement data in which the operating conditions were adjusted so that various particle sizes could be obtained using the intended pulverized material in 0, and the frequency characteristics output by the actual acoustic characteristic detection means 43 in each condition were recorded. It is stored in a table format with data such as granularity as an index.

The operating condition adjustment means 45 reads the reference acoustic characteristic Fn corresponding to the operating condition setting of the crusher l set by the control unit 41 from the reference acoustic characteristic storage means 44, and also reads the actual acoustic characteristic F of the crusher IO in operation. is monitored by the actual acoustic characteristic detecting means 43, the respective characteristics Fr and Fn are compared to extract the differences between them, and the control section 41 is adjusted so that the actual acoustic characteristic Fr approaches the reference acoustic characteristic Fn.

In this embodiment configured in this way, the crushing device l
is automatically operated under the control of the control device 40. That is, the crusher 10, the valve 24, and the fan 22, 32 operate based on the settings of the control unit 41, and the crusher IO finely crushes the crushed raw material that is sequentially supplied and sends it out as a crushed product.

Here, the operating state adjusting means 45 reads out the reference acoustic characteristic Fn corresponding to the target particle size etc. set in the control section 41, and compares it with the actual acoustic characteristic F" inputted sequentially.
Adjust.

As shown in Figure 2, under the current operating conditions, the crusher I
Assuming that the desired particle size is being crushed in the crusher IO, the frequency distribution of the sound generated from the crusher IO is based on the standard acoustic characteristic F.
It will be something like n. Here, the low-frequency peak is the operational noise of the crusher 10, and the high-frequency peak is the sound accompanying the collision and destruction of the crushed objects, and the center of this high-frequency peak is the largest component inside the crusher 10. Corresponds to granularity. On the other hand, if the frequency distribution of the sound generated from the crusher IO during the crushing operation is the actual acoustic characteristic Fr, the center of the high-frequency peak is shifted to the bass side, and the collision sound of crushed objects in the crusher IO, etc. is determined to be sparse. Therefore, the operating state adjusting means 45 adjusts the settings of the control unit 41 and performs operations such as increasing the rotational speed of the crusher 10 and reducing the amount of raw material supplied, so that the actual acoustic characteristic F'' and the reference acoustic characteristic Fn are matched. Each characteristic F
When r and Fn match, it means that the actual particle size in the crusher 10 represented by the actual acoustic characteristic Fr is the same as the particle size in the reference acoustic characteristic Fn, that is, it has been adjusted to the desired particle size input to the control unit 41. become.

According to this embodiment, the following effects can be obtained.

That is, the actual acoustic characteristic detection means 43 and the reference acoustic characteristic storage means 44 detect the crusher I in the current operating state.
By comparing and contrasting the actual acoustic characteristic Pr of IO with the reference acoustic characteristic Fn of the crusher 10 in a previously defined operating state, the particle size etc. inside the current crusher IO can be indirectly but reliably investigated.

Therefore, feedback control corresponding to the actual pulverization state inside the pulverizer 10 can be realized in the control device 40 that automatically operates the pulverizer 1 including the pulverizer 10.
By adjusting the settings in the control unit 41 using the operating state adjustment means 45, it is possible to appropriately respond to fluctuations in the raw material and the crusher 10.

Here, in the embodiment described above, since the reference acoustic characteristic Fn stored in the reference acoustic characteristic storage means 44 is actually measured, control adjustment can be performed based on accurate reference data.

Furthermore, since the actual acoustic characteristic detection means 43 is used to actually measure the reference acoustic characteristic Fn, the basic conditions for each characteristic Fr and Fn can be made the same, and the accuracy in comparison can be improved.

Note that the present invention is not limited to the above embodiments,
It also includes the following modifications.

In other words, the reference acoustic characteristic Fn and the actual acoustic characteristic Fr are not limited to the frequency distribution, but may also be one in which the center frequency and level of the peak corresponding to the particle size of the pulverized material are stored as numerical values from the distribution. , the format of the acoustic characteristics may be selected as appropriate for implementation.

Furthermore, as the conditions to be stored together with the reference acoustic characteristic Fn, conditions that have a large influence on the crushing operation of the crusher 10 may be appropriately selected from among the conditions and properties of the crushed raw material, the operating conditions of each part of the crusher 1, etc. , those that do not have much influence can be omitted as appropriate.

On the other hand, the configuration of the actual acoustic characteristic detecting means 43 is not limited to the above-described embodiment, and may be appropriately set in accordance with the format of the acoustic characteristic described above.

Further, the reference acoustic characteristic storage means 44 may be configured using an appropriate storage means, and its medium format may be appropriately selected during implementation.

Furthermore, a microphone 4 that collects the sound of the crusher IO
The format of 6 is arbitrary, and its location is not limited to the body of the crusher 1O, but may also be in the take-out part, or
The sound is not limited to 0, and the sound from the circulation path 31 may be collected.

Furthermore, in the above embodiment, the settings of the control unit 41 were adjusted based on the comparison between the reference acoustic characteristic Fn and the actual acoustic characteristic Fr, but in the case of experimental crushing using the crusher 10 alone, for example, As the particle size increases, it can also be used for operational control such as stopping operation when the high-frequency peak of the actual acoustic characteristic Fr matches the reference acoustic characteristic Fn.

As described above, the present invention can be applied to various types of crushers 10 and their control devices 40.

〔Effect of the invention〕

As described above, according to the crushing operation control device of the present invention, the actual acoustic characteristics actually generated by the crusher are compared and contrasted with the reference acoustic characteristics stored in advance. The internal state of the pulverizer can be indirectly grasped, control can be performed according to the actual pulverizing state of the pulverizer, and the operating state of the pulverizer can be adapted to fluctuations.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a graph of frequency distribution in the embodiment. l...Crushing device, 10...Crusher, 40...Control device, 43...Actual acoustic characteristic detection means, 44...Reference acoustic characteristic detection means, 45...Driving operation adjustment means, Sr.
...Acoustic signal, F'...Actual acoustic characteristic, Fn...Reference acoustic characteristic.

Claims (1)

[Claims] (1) Reference acoustic characteristic storage means that stores reference acoustic characteristics that occur when the crusher is in the intended operating state, and actual acoustic characteristic detection that detects actual acoustic characteristics that occur while the crusher is in crushing operation. A pulverizing operation control device comprising: means for adjusting the operating state of the pulverizer by comparing the actual acoustic characteristics with the reference acoustic characteristics.