JPH05223460A - Detecting device for missing of fire brick of rotary kiln - Google Patents

Abstract

PURPOSE:To enable rapid and accurate detection of the notch of a fire brick by a method wherein through synchronization of the number of revolutions of a rotary kiln with scanning of a temperature sensor, the time of occurrence of fire brick missing and the missing place are both automatically detected to announce an alarm. CONSTITUTION:During operation of a plant, a rotary kiln 1 is driven with the aid of an electric motor 6. Simultaneously, a pulse proportioning the number of revolutions of the rotary kiln 1 is inputted to a sequence 7 from a pulse oscillator 9 coupled to the electric motor 6, and the number of the pulses is counted by a counter circuit 11. Further, the number of counts is inputted to a present position computing circuit 12. Meanwhile, measurement data of a temperature sensor 3 is read at intervals of a specified pulse and inputted to a deciding circuit 14 through ON of a trigger 13. A difference between a present read value and a preceding read value is determined. When the difference therebetween exceeds a bias value, it is decided that the missing of a fire brick 2 occurs. Further, an electric motor 8 is controlled by a control circuit 15, and scanning of the temperature sensor 3 is executed on an X-axis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting a lack of refractory brick stuck inside a rotary kiln used in a firing process in a cement plant.

[0002]

2. Description of the Related Art An example of a conventional refractory brick missing detection method will be described with reference to FIG. In the figure, a rotary kiln 1 is provided with a refractory brick 2 inside, and is configured to rotate 2-3 times per minute while the plant is operating. In order to measure the outer wall temperature of the rotary kiln 1, a temperature sensor 3 such as an infrared thermometer is provided. The temperature sensor 3 measures the rotary kiln 1 while scanning it on the X axis as shown by a broken line. The measurement result is input to the computer 4, the computer 4 performs data processing and image processing, and the result is displayed on the CRT 5.

The display screen of the CRT 5 shows the relationship between the scan position L of the temperature sensor 3 and the measured temperature as shown in FIG. By reading the scan distance L corresponding to the point (for example, "A" point) where the temperature is changing rapidly from this display screen, the refractory brick missing position can be detected.

[0004]

However, in such a conventional refractory brick missing detection method, the rotational speed of the rotary kiln 1 and the scanning time of the temperature sensor 3 such as an infrared temperature measuring device are not always synchronized. Therefore, the place where the refractory brick 2 is missing is L in the X direction of the rotary kiln 1.
The position on the circumference of the position cannot be specified.

If the rotational speed of the rotary kiln 1 is not synchronized with the scanning time of the temperature sensor 3 such as an infrared thermometer, the accuracy of the temperature value with respect to each distance in the X-axis direction is not constant. That is, if the scanning time of the temperature sensor 3 such as the infrared temperature measuring device is constant and the speed of the rotary kiln 1 is high, the temperature measurement scanning range by the temperature sensor 3 such as the infrared temperature measuring device is not continuous as shown in FIG. As a result, there is a possibility that the temperature measurement may leak. Furthermore, in order to perform image processing and display on the CRT 5, image processing software by the computer 4 and the CRT 5 are required, and there is a problem that the detection device is expensive.

The present invention has been made in view of the above circumstances, and an object thereof is a rotary kiln refractory brick missing detection device capable of accurately specifying a missing location of a refractory brick stuck inside a rotary kiln and causing no measurement leakage. To provide.

[0007]

In order to achieve the above-mentioned object, the present invention drives a rotary kiln in a rotary kiln lacking refractory brick detecting device for detecting a lack of a refractory brick stretched inside a rotary kiln. An electric motor,
A pulse oscillator coupled to this motor to output the position from the origin, a temperature sensor swinging motor that reads the pulse value of this pulse oscillator to determine the scan position of the temperature sensor, and controls this motor Temperature sensor swing motor control circuit, circuit for resetting the counter that determines the origin on the rotary kiln, judgment circuit for reading the data from the temperature sensor to judge the absence of refractory bricks, and lack of the refractory bricks It is characterized by being composed of a sequencer having a circuit that sometimes generates an alarm.

[0008]

According to the present invention, by synchronizing the rotation speed of the rotary kiln and the scanning of the temperature sensor such as an infrared thermometer, both when and where the refractory brick is missing are automatically detected and an alarm is generated. Therefore, the location where the refractory brick is missing can be known quickly and accurately.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention. As shown in the figure, the rotary kiln refractory brick missing device of the present invention includes an electric motor 6 for driving the rotary kiln 1, a pulse transmitter 9 coupled to the electric motor 6, and an X-axis of the rotary kiln 1. It is composed of a temperature sensor 3 such as an infrared temperature measuring device for measuring the temperature above, a temperature sensor swinging electric motor 8 for scanning the temperature sensor 3, and a calculation and control sequencer 7. The sequencer 7 also includes a counter circuit 11 and a current position calculation circuit 12
A read trigger 13, a determination circuit 14, and a sensor swing motor control circuit 15.

Next, the operation of this embodiment will be described.
During operation of the plant, the rotary kiln 1 is driven by the electric motor 6 so as to rotate 2-3 times per minute. This electric motor 6
Sequencer 7 from pulse generator 9 coupled to
A pulse proportional to the rotation speed of the rotary kiln 1 is input to, and the number of pulses is counted by the counter circuit 11.

At the first start, the temperature sensor 3 such as an infrared thermometer is placed at the origin measurement position and the reset button 10 is pressed to reset the counter value of the counter circuit 11 to zero. Next, the counter number of the counter circuit 11 is input to the current position calculation circuit 12 to calculate the current measured temperature position. That is, the diameter of the rotary kiln 1 is D,
As shown in FIG. 2, assuming that the temperature measurement zone is W, the scan of the temperature sensor 3 per rotation of the rotary kiln 1 moves by W, and if P pulse is generated in one rotation of the rotary kiln 1, X of the temperature sensor 3 is generated. Axial movement distance Al and Y
The axial movement distance Bl is expressed by the following equation.

[0012]

[Equation 1] Here, C is the count number, and x is the movement distance in the X-axis direction.

Next, the detection of the loss of the refractory brick 2 is calculated as follows because the temperature of the missing portion rises with respect to the ambient temperature. First, the measurement data of the temperature sensor 3 such as an infrared temperature measuring instrument is input to the determination circuit 14 by turning on the read trigger 13 every time when a certain number of pulses is reached, and the measurement data at that time is read. The determination circuit 14 calculates the difference between the previous value read by the previous read trigger and the absolute value of the current value read by the current read trigger,
If the value T exceeds the bias value, it is determined that the refractory brick 2 is missing, and an alarm is output together with the current position data Al and Bl, so that the refractory brick 2 can be detected.

A temperature sensor 3 such as an infrared temperature measuring device
The scanning in the X-axis direction controls the temperature sensor swing motor 8 so that the scanning distance on the X axis increases in proportion to the pulse count number. Therefore, the speed reference of the temperature sensor swing motor control circuit 15 is determined. The temperature sensor swinging electric motor 8 is controlled by the output.

As described above, according to this embodiment, it is possible to automatically detect the missing time and missing position data of the refractory brick 2 and generate an alarm.

[0016]

As described above, according to the present invention,
When the refractory bricks stuck inside the rotary kiln are missing and the missing position data can be automatically detected and an alarm can be generated, uniform and stable production is impaired and the part where the refractory bricks are missing. It is possible to minimize the occurrence of damage to the rotary kiln due to the difference in the temperature expansion coefficient.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing a defect in a temperature measurement scanning range by a general temperature sensor.

FIG. 3 is a block diagram of a conventional refractory brick missing detection device.

FIG. 4 CRT in a conventional refractory brick missing detection device
Of temperature distribution display screen.

[Explanation of symbols]

1 ... Rotary kiln, 2 ... Fireproof brick, 3 ... Temperature sensor such as infrared thermometer, 4 ... Calculator, 5 ... CRT, 6 ...
Rotary kiln drive motor, 7 ... Sequencer, 8 ... Temperature sensor swing motor, 9 ... Pulse transmitter, 10 ... Counter reset push button switch, 11 ... Counter circuit, 12 ... Current position calculation circuit, 13 ... Read trigger , 14 ... Judgment circuit, 15 ... Sensor swing motor control circuit.

Claims (1)

[Claims] 1. A rotary kiln lacking refractory brick detecting device for detecting a lack of a refractory brick stretched inside a rotary kiln, comprising: an electric motor for driving the rotary kiln;
A pulse oscillator coupled to this motor to output the position from the origin, a temperature sensor swinging motor that reads the pulse value of this pulse oscillator to determine the scan position of the temperature sensor, and controls this motor Temperature sensor swing motor control circuit, circuit for resetting the counter that determines the origin on the rotary kiln, judgment circuit for reading the data from the temperature sensor to judge the absence of refractory bricks, and lack of the refractory bricks A rotary kiln refractory brick missing detection device comprising a sequencer having a circuit that sometimes generates an alarm.