JPH0456670B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an operation control device for a pulverization system, and more particularly to one improved so as to be able to automate manual operations when restarting the operation.

[Background of the invention and its problems]

Generally, the operation control device for a grinding system such as a ball mill uses a CFW constant flow rate control method using a so-called constant feedway (hereinafter referred to as CFW) to control the amount of material to be ground fed into the grinding system. Ta. However, since this method does not take into account changes in the operating conditions of the grinding system, it is not always possible to obtain satisfactory control results.

For this reason, recent efforts have been made to detect physical quantities that change according to the operating conditions of the crushing system and to keep them constant.
A CFW flow rate variable control system that variably controls the CFW flow rate is adopted.

Incidentally, in either case, the former two methods require various manual control operations by the driver when restarting the operation.

That is, in order to perform the startup processing mode when restarting operation, the operator first performs a sequential startup operation, and then
The feeding of the material to be crushed into the grinding system is started by manually setting the feeding amount setting value of the material to be crushed to an appropriate feeding amount setting value such as gradually increasing the feeding amount setting value of the material to be crushed. Then, it was determined whether the controlled signal as a physical quantity detected from the grinding system had stabilized, and when it was determined that the signal was stabilized, an operation was performed to shift to a fixed value mode using normal automatic control. .

However, with such conventional grinding system operation control devices, differences tend to occur in the initial feed rate setting of the material to be crushed when restarting operation depending on the operator, and there is also a problem with stabilization. Differences tend to occur at the time of judgment, and in particular, the latter judgment tends to be delayed in order to avoid the undesirable hunting phenomenon that occurs due to the judgment being made too early, so it is often necessary to stabilize the operation control of the crushing system. It took a long time to transform. As a result, there was a serious problem in that there was a lot of waste in power consumption when restarting the operation, and the resulting pulverized product was likely to have uneven quality.

[Purpose of the invention]

Therefore, the present invention has been made in view of the above points, and by automating the manual operation at the time of restarting operation, it is possible to stabilize the operation control operation in a short time, and furthermore, it is possible to stabilize the operation control operation in a short time. The object of the present invention is to provide an extremely good operation control device for a pulverization system that is improved so as to reduce power consumption as much as possible and improve the quality of the obtained pulverized product as much as possible.

[Summary of the invention]

That is, in order to achieve the above object, the present invention includes a detection means for detecting a physical quantity that changes depending on the operating conditions of a crushing system as a controlled signal, and a detection means for detecting a physical quantity that changes depending on the operating conditions of a grinding system, and a detection means for detecting a physical quantity that changes depending on the operating conditions of a crushing system, and a detection means for detecting a physical quantity that changes depending on the operating conditions of a grinding system. and a control system for sending a control signal for a constant value control mode to the grinding system to variably control the amount of material to be crushed to be supplied to the grinding system based on a target value, the control system average value data of the supply amount of the material to be crushed at the time of the previous operation stop, additional data that gives a predetermined amount of extra to the average value data, and tolerance width data that gives a predetermined tolerance range to the target value. Pre-stored storage means, reading out the average value data and extra data from the storage means, setting the initial feeding amount of the material to be crushed at the start of the current operation, and starting based on the set value. initial feeding amount setting means for sending a control signal for the processing mode from the control system to the grinding system; A determining means for determining whether the control signal is within an allowable range of the target value, and a command for continuing the startup processing mode or shifting to the fixed value control mode according to the determination result by the determining means. The present invention is characterized in that it includes mode command means for giving a mode command to the control system.

[Embodiments of the invention]

An embodiment of the present invention will be described in detail below with reference to the drawings.

That is, in FIG. 1, 10 is a crushing system, a ball mill 11, and a bucket elevator 1.
2. Separator 13, belt scale 14, and sound pressure detectors 15a and 15b such as microphones.
It is composed of etc. Then, the crushed clinker, which is obtained by crushing the clinker which is the material to be crushed discharged from the ball mill 11, is transported to the bucket elevator 1.
2 to the separator 13. The crushed clinker transferred to this separator 12 is classified here, so that a part of it is transferred to the discharge port 13.
1 is discharged as a pulverized product, and the remainder is fed into the ball mill 11 again via a return path 132.

Further, clinker, which is a material to be crushed, is fed into the ball mill 11 in an amount according to a command by a control signal outputted from a control unit 30 as a control system, which will be described later, using a belt scale 14. .

The bucket elevator 12 is provided with a detector 16 for detecting a driving load (for example, bucket elevator current or electric power) of a motor (not shown) that is a driving source of the bucket elevator 12.

Further, the ball mill 11 is provided with a detector 17 for detecting a mill drive load (for example, electric power consumption E), and the return path 132
A detector 18 is provided for detecting the return amount of crushed clinker.

And each of the detectors 15a, 15b, 16,
Each detection output from 17 and 18 is sent to an analog-to-digital converter (hereinafter referred to as ADC) 31 of a control unit 30 in the grinding system 1.
It is supplied as a controlled signal component that provides a physical quantity that changes according to the zero operating conditions.

On the other hand, the control unit 30 as the control system includes, in addition to the ADC 31, a digital input unit (hereinafter referred to as DI) 32, a central processing unit (hereinafter referred to as CPU) 33, and a read-only memory (hereinafter referred to as ROM). )34
a, random access memory (hereinafter referred to as RAM) 34b, interface 35 and digital-to-analog converter (hereinafter referred to as DAC)
It is composed of 36 mag.

The detection outputs, that is, the controlled signal components inputted to the ADC 31 are digitized and then supplied to the CPU 33 via the DI 132.

Here, in accordance with the program contents stored in the ROM 34a, the CPU 33 uses the controlled signal component as the input signal, the target set value data for the fixed value control mode by automatic control, which is registered in advance in the RAM 34b, and the data as described below. The interface 3 performs so-called PID calculations and other necessary calculations based on each data required in the start-up processing mode at the time of restarting operation, and outputs control signals for each mode according to the so-called CFW variable flow rate control method.
5. The analog signal is converted into an analog signal via the DAC 36 and supplied to the belt scale 14 in the grinding system 10.

Note that the CPU 33 is supplied with an operation ON or OFF signal from an operation switch 37 via the DI 32.

In addition, the RAM 34b contains target setting value data for the fixed value control mode by normal automatic control regarding the amount of material to be crushed, as well as data from the previous operation that is required for the start-up processing mode when restarting the operation. R% extra data required to set the average value data of the previous feed amount and this average value data plus a certain amount of extra amount R% as the initial feed amount setting value at the time of restarting operation. is written. In addition, the RAM 34b has a process for determining whether the controlled signal obtained in order to determine the stabilization of the control operation in the start-up processing mode is within the allowable range of S% of the target value when restarting the operation. The allowable width data of S% required for this is written. Furthermore, if the controlled signal obtained in the startup processing mode at the time of restarting operation does not reach the allowable range within S% of the target value even after a certain period of time (T), the startup processing mode is forcibly stopped. T time data necessary for shifting to fixed value control mode by automatic control is written.

Next, the operation of the pulverization system operation control device configured as described above will be explained with reference to the flowchart shown in FIG.

That is, when the operation switch 37 is turned on in step S1, the CPU 33 takes in the operation-on signal and reads out the program for restarting operation from the ROM 34a. Then, first step
S2 startup processing mode starts. Next, proceeding to step S3, the CPU 33 extracts from the RAM 34b the average value data of the amount of materials to be crushed immediately before the previous operation stop and adds a certain amount R% to this average value data.
The R% extra data that gives the extra amount of is read out, and the initial feed amount of the material to be crushed at the time of restarting the current operation is set. Then, this initial feeding amount set value data is sent out from the CPU 33 and supplied to the belt scale 14 via the interface 35 and DAC 36. As a result, clinker, which is a material to be crushed, is fed into the ball mill 11 in an amount corresponding to the initial feeding amount set value data, and the crushing control operation is started.

Here, the reason for setting the initial feeding amount data of the material to be crushed to be R% (for example, 10 to 50%) higher than the average value immediately before the previous operation stop is to speed up the start-up when restarting operation. This is to shorten the time required to stabilize the startup processing mode. In this case, the clinker, which is the material to be crushed, may be actually introduced instantaneously, but may be gradually introduced over a certain period of time, for example, 20 seconds, in consideration of maintenance of the crushing system.

Then, when the operation of the crushing system 10 is restarted, the detected outputs in the startup processing mode, that is, the controlled signals that are physical quantities, are sent from the detectors 15a, 15b, 16, 17, and 18 via the ADC 31 and the DI 32.
It will be supplied to CUP33.

Next, proceeding to step S4, the CPU 33
Based on the S% allowable width data read from the RAM 34b, it is determined whether the controlled signal in the startup processing mode is within the allowable range of S% of the target value. If the determination at step S4 is YES, the process proceeds to the next step S% to end the startup processing mode, and then proceeds to the next step S6 to shift to the normal fixed value control mode by automatic control. In this fixed value control mode, as described above, the CFW flow rate variable control method is performed based on the target set value data read from the RAM 34b.

However, if the judgment in step S4 is NO, the process proceeds to step S7 and the CPU 33 updates the RAM 34.
Based on the T time data read from b, it is determined whether a certain period of time T (for example, several minutes to several tens of minutes) has elapsed since the start of the startup processing mode.

If the judgment in step S7 is NO, the process returns to step S4 and continues the startup processing mode, but if YES, the process proceeds to step S5, where the startup processing mode is forcibly terminated.
Proceeding to step S6, the process is forcibly shifted to the fixed value control mode using normal automatic control.

After executing the fixed value control mode for a desired time in step S6, when the operation switch 37 is turned off to stop the current operation in step S8, the CPU 33 takes in the operation off signal via the DI 32 and performs normal operation. After stopping the fixed value control mode by automatic control, the process proceeds to the next step S9, where the average value data of the amount of materials to be crushed immediately before the operation is stopped is calculated and stored in the RAM 34b. This ends the series of operation control operations.

In other words, in the case of the operation control device for the pulverization system as described above, the initial feed amount setting value of the material to be pulverized and the stabilization judgment point required for the start-up processing mode when restarting the operation are set based on the process during the previous operation. Since the machine can be operated while automatically adjusting parameters according to the characteristics, there are no differences between operators as in the case of conventional manual operation. This allows the startup processing mode to be stabilized in the shortest possible time, reducing power consumption by several percent.
In addition to making it possible to reduce the above, it is possible to improve the quality of the obtained pulverized product as much as possible, and it is also possible to save labor and improve the maintainability of the pulverization system. Become.

〔Effect of the invention〕

Therefore, as described in detail above, according to the present invention, by automating the manual operation at the time of restarting operation, it is possible to stabilize the operation control operation in a short time, and by extension, the power consumption is reduced. It is possible to provide an extremely good operation control device for a pulverization system that is improved so as to reduce consumption as much as possible and improve the quality of the obtained pulverized product as much as possible.

[Brief explanation of the drawing]

FIG. 1 is a configuration explanatory diagram showing one embodiment of a crushing system operation control device according to the present invention, and FIG. 2 is a flowchart for explaining the operation of FIG. 1. 10... Grinding system, 11... Ball mill, 12...
...bucket elevator, 13...separator,
14... Belt scale, 15a, 15b...
Sound pressure detector (microphone), 131...exhaust port,
132...Return path, 16, 17, 18...
...Detector, 30...Control unit (control system), 31...ADC, 32...DI, 33...
CPU, 34a...ROM, 34b...RAM, 3
5...Interface, 36...DAC, 37
...Driving switch.

Claims (1)

[Claims] 1. A detection means for detecting a physical quantity that changes depending on the operating conditions of the grinding system as a controlled signal, and a detection means for detecting the amount of material to be ground to be supplied to the grinding system so that the controlled signal from this detection means is constant. In an operation control device for a grinding system, which includes a control system that sends a control signal for a fixed value control mode that performs variable control based on a target value to the grinding system, the amount of material to be ground supplied by the control system at the time of the previous operation stop is determined. a storage means in which average value data, additional data that gives a predetermined amount of extra to the average value data, and tolerance width data that gives a predetermined tolerance to the target value are stored in advance, and this storage means The average value data and extra data are read out from the control system to set the initial feeding amount of the material to be crushed at the start of the current operation, and a control signal for the start-up processing mode based on the set value is sent from the control system to the crusher. an initial feeding amount setting means for sending the amount to the system; and reading permissible range data for the target value from the storage means to determine whether the controlled signal from the detecting means in the startup processing mode is within the permissible range for the target value. and mode command means for giving a command to the control system to determine whether to continue the startup processing mode or to shift to the constant value control mode, depending on the determination result by the determination means. A grinding system operation control device featuring: