JPH1030966A - Automatic measuring method for temperature of high-temperature object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an automatic measuring method in which the temperature measurement in a batch of a high-temperature object such as molten iron or the like can be automated. SOLUTION: A temperature input signal from a temperature sensor 1 is read out automatically every moment into a computing device 9 so as to be stored continuously as time-series data, the prescribed number of progressions is created on the basis of the stored time-series continuous data, a balance-point discrimination computing operation is performed sequentially, an obtained balance-point discrimination progression is averaged and processed, a temperature measured value is found so as to be displayed on a display device 11 which outputs the obtained temperature measured value, and the measured value is output to a host computer or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically measuring the temperature of a high-temperature object, and is suitable for batch-wise measuring the temperature of hot metal, molten steel or steel in a steel making process using a temperature sensor such as a thermocouple. A simple automatic temperature measurement method.

[0002]

2. Description of the Related Art Conventionally, when the temperature of a high-temperature object is measured in batches by using a temperature sensor such as a thermocouple, for example, as disclosed in JP-A-49-15614, recording is performed simultaneously with the start of measurement. The operator operates the gauge to draw the measurement signal, the operator sees the measured waveform, determines the stabilized equilibrium point, reads the temperature measurement value from the equilibrium point, and then applies the measured value.・ It was common to make an inappropriate decision.

[0003]

However, in the above-mentioned conventional method, in addition to the original operation of measuring the temperature, it is necessary for a human to intervene in determining the equilibrium point of the measured waveform, reading the measured value, and the like. For this reason, there are many problems in determining the suitability of measurement values, such as performing measurement work without noticing the disconnection of the temperature sensor, and causing individual differences in the determination of equilibrium points and reading of measurement values. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and is capable of automatically judging an equilibrium point and judging the suitability or unsuitability of a measured temperature value. It is an object of the present invention to provide a method for automatically measuring a high-temperature object.

[0005]

According to the present invention, when a temperature of a high-temperature object is automatically measured in a batch by using a temperature sensor, a temperature input signal from the temperature sensor is automatically read every moment. A step of continuously storing as series data, a step of creating a predetermined number of sequences from the stored time-series continuous data, and sequentially performing an equilibrium point discrimination operation, An automatic temperature measurement method for a high-temperature object, comprising: a step of obtaining a temperature measurement value by performing an averaging process; and a step of outputting the obtained temperature measurement value.

The following (A),
It is preferable to use the following equation (C) for calculating the measured temperature value using the equation (B). | T _i −T _{i + 1} | ≦ α (i = j,... J + m−1)... (A) Max (T _j, T _{j + 1,} ... T _{j + m} ) −Min (T _{j, T j + 1, ...} T j + m) ≦ β (j = 1, ... n-m) .................. (B) T * = (ΣT i -Max T i -Min T i) / (M-2) (i = k,... K + m) (C) where α, β: parameters, T ^* : temperature measurement values.

Preferably, the reading is automatically started when the temperature input signal exceeds a predetermined threshold value, and the disconnection of the temperature sensor is automatically detected. desirable.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing an embodiment of a temperature measuring device to which the present invention is applied, and FIG. 2 is a block diagram showing a configuration of the arithmetic device. In these figures, reference numeral 1 denotes a temperature sensor having a thermocouple 1a attached to the tip, which is handled by an operator 2. Reference numeral 3 denotes a high-temperature hot metal flowing in the tapping gutter 4, for example. Reference numeral 5 denotes a wiring for transmitting a measurement signal detected by the temperature sensor 1. Reference numeral 6 denotes a multi-point switch for switching the measurement signals from the plurality of temperature sensors 1. Reference numeral 7 denotes a thermocouple converter for measuring temperature, and 8 denotes a thermocouple converter for detecting disconnection. The thermoelectromotive force on the order of mV detected by the temperature sensor 1 is, for example, a DC voltage of 1 to 5 VDC or a DC current of 4 to 20 mA DC. Into a DC reference signal S. 9 is an arithmetic unit, 10
Is an alarm device, and 11 is a display device.

The above-mentioned multipoint switch 6, the thermocouple converter 7 for temperature measurement, the thermocouple converter 8 for disconnection detection, and the arithmetic unit 9
Is usually stored integrally with the measuring panel 12 installed at the site. In addition, the alarm device 10 and the display device 11 are also a measuring panel.
It is often housed and placed in 12. The arithmetic unit 9
As shown in FIG. 2, an A / D input unit 13, an arithmetic processing unit 14, such as a microcomputer, a transistor output unit 15, a computer link unit 16, and these device units are individually time-series. It is composed of a programmable controller 17 for controlling.

The A / D input unit 13 inputs the analog signal of the DC reference signal S converted by the thermocouple converter 7 for measuring temperature and the thermocouple converter 8 for detecting disconnection and converts the analog signal into a digital signal. It has the function to do. Further, the transistor output unit 15 has a function of outputting a measurement signal and a read request signal to, for example, a host computer used in the production management system, and a function of outputting a status display signal, an alarm signal, and the like to the alarm device 10. The computer link unit 16
Has a function of outputting a BCD signal to the display device 11 to display the measured temperature value. The arithmetic processing device 14 includes a memory 18 for storing programs and data, and an arithmetic processing unit 19, and performs various arithmetic processes described later. This memory
The number of data stored in 18 is desirably about 80, for example.

Then, when the worker 2 immerses the temperature sensor 1 in the hot metal 3 flowing in the tapping gutter 4 and measures the temperature, the measurement signal is transmitted to the multipoint switch 6 via the wiring 5. . The measurement signal is sent to a thermocouple converter 7 for temperature measurement.
Is input to the disconnection detection thermocouple converter 8 and is converted into the DC reference signal S. Here, if the thermocouple 1a is in a disconnected state, it is output to the alarm device 10 via the transistor output unit 15 of the arithmetic unit 9, so that the display lamp is turned on and an alarm is issued by a buzzer. If the thermocouple 1a is normal, the DC reference signal S from the thermocouple converter 7 for temperature measurement is taken in the A / D input unit 13 in a time series and stored in the data area of the memory 18; According to the program written in advance in the arithmetic processing unit 19,
The determination of the equilibrium point and the calculation of the measured temperature value are performed according to the procedure shown in FIG.

The procedure will be described below. The measurement signals read in time series are stored in the memory 18 as data, and T ₁ , T ₂ ,
T ₃ ,... T _n (where, n; parameter, where n ≧
Store sequentially and sequentially as the sequence of 3). Using an arbitrary integer m (where m ≧ 2) and j as parameters from the sequence of data stored in the memory 18, a sequence consisting of m pieces of continuous data is moving averaged as shown in FIG. While shifting one by one by the calculation method, until an integer parameter j that satisfies the equilibrium point discriminant shown in the following equations (1) and (2) is obtained.
repeat.

| T _i −T _{i + 1} | ≦ α (i = j,... J + m−1) (1) Max (T _j, T _{j + 1,} ... T _{j + m} ) − Min (T _j, T _{j + 1,} ... T _{j + m} ) ≦ β (j = 1,..., Nm) (2) where α, β; parameters. By changing the integer parameter j in order from 1 to nm, the equilibrium point discriminants of the above (1) and (2) are checked to determine whether or not there is a satisfactory integer parameter j. If a satisfactory integer parameter j is not found, it is determined that "temperature measurement has failed", an alarm is displayed on the alarm device 10, and the thermocouple is replaced to prepare for another measurement. When a satisfying integer parameter j is found, j at that time is set to k (k = 1,... Nm), and a sequence satisfying the above equilibrium point discriminant is T _k , T _{k + 1} , T
_{As k + 2} ,..., T _{k + n} , an arithmetic average is performed using the following equation (3) to obtain a measured temperature value T ^* .

T ^* = (ΣT _i −Max T _i −Min T _i ) / (m−2) (i = k,... K + m) (3) where Max T _i is T _i , Min T _i is the minimum value of T _i , which is excluded to improve the accuracy of the average value. When a plurality of satisfying integer parameters j are found, for example, (Max−Mi
n) The one having the smallest value may be selected as k. The obtained temperature measurement value T ^* is output to the display device 11 and also to a host computer or the like.

Although the temperature sensor 1 is described as being handled by the worker 2 in the above example, it goes without saying that the present invention is also applicable to a case where the temperature is automatically measured using an automatic measuring device. Absent. Further, the present invention is not limited to the measurement of hot metal temperature, but in the steelmaking process, for example, batch-type temperature measurement of molten steel or continuous cast slabs, rolled materials, etc. of a converter, and quality judgment and quality assurance in other technical fields. ,
The present invention can also be applied to batch-like temperature measurement required for confirmation of manufacturing conditions and the like.

[0016]

EXAMPLE The automatic measuring method of the present invention was applied to the measurement of hot metal temperature during tapping of a blast furnace. An immersion thermocouple was used as the temperature sensor 1 and arranged at each of the four tapping gutters 4 as measurement locations, and the input was switched one by one with the multipoint switch 6. It should be noted that a signal for determining the measurement location was also input simultaneously. The display device 11 is of a liquid crystal type and has a resolution of 1 ° C., for example, so that each parameter can be input. This LCD type is programmable controller
It also has a function to display all the data stored inside 17.

The standard of the immersion thermocouple used here is R type (JIS standard), and its temperature range is 1100 to 1600 ° C.
And Also, a sampling start timer (not shown) is provided, and 50 data are taken in after the temperature signal exceeds 1100 ° C. and the set time in the timer elapses. Note that even if the disconnection detection thermocouple converter 8 exceeds 1100 ° C. and the set time of the timer elapses, the temperature measurement thermocouple converter 7 remains
If the temperature has not reached 1100 ° C, it is judged as `` temperature measurement failure '', an alarm is displayed on the alarm device 10, and the `` temperature measurement failure '' signal and the temperature measurement value `` 9999 ° C '' are sent to the host computer for a certain period of time. (For example, for 3 to 4 seconds), and then automatically reset by an internal timer (not shown) of the programmable controller 17.

When the parameter n is set to 50 and the parameters α and β are set to 1 ° C. and 2 ° C., respectively, the measurement signal (see FIG. 5) from the immersion thermocouple is sampled at a high speed of 100 msec, and 50 data are collected. The data was stored in the data area of the memory 18, and the integer parameter m was set to 6, and the calculation was sequentially performed according to the above procedure. As a result, it was found that when the integer parameter j was k = 24, the expressions (1) and (2) were satisfied. Then, when the measured temperature value T ^* was calculated using the equation (3), T ^* = 1297 ° C. was obtained.

In the above-described embodiment, the description has been made assuming that only the "temperature measurement failure" is displayed as the alarm content. However, if necessary, the "programmable controller abnormality", the "distribution box fuse blown", and the "battery low" are displayed. Or an alarm display such as "Conduction OK", "Measurement Completed", etc.

[0020]

As described above, according to the present invention,
It has excellent effects as described below. (1) The temperature measurement value is automatically read without drawing the temperature measurement waveform on the recorder.Therefore, there is no individual difference in the determination of the equilibrium point, the reading of the measurement value, etc., and quality assurance for the next process is ensured. What can be enhanced. (2) Detection of disconnection of thermocouples, etc., and determination of temperature measurement failure can be automatically obtained, so that the workload of the operator can be significantly reduced. (3) When the measured value exceeds a predetermined threshold value, the measurement signal of the temperature sensor is automatically read and the temperature measurement value is calculated, so that it is possible to make a judgment based on the same standard and standardization can be achieved. .

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a measuring apparatus to which the present invention is applied.

FIG. 2 is a block diagram illustrating a configuration of the arithmetic device of FIG. 1;

FIG. 3 is a flowchart showing a procedure for determining an equilibrium point and calculating a measured temperature value according to the present invention.

4A is an explanatory diagram showing an image of a data sequence stored in a memory, and FIG. 4B is an explanatory diagram showing an image of a data sequence to be processed.

FIG. 5 is a characteristic diagram showing an example of temperature measurement waveform data.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Temperature sensor 1a Thermocouple 2 Worker 3 Hot metal 4 Tapping gutter 5 Wiring 6 Multipoint switch 7 Thermocouple converter for temperature measurement 8 Thermocouple converter for disconnection detection 9 Computing device 10 Alarm device 11 Display device 12 Measurement panel 13 A / D input unit 14 Arithmetic processing unit 15 Transistor output unit 16 Computer link unit 17 Programmable controller 18 Memory 19 Arithmetic processing unit

[Procedure amendment]

[Submission date] July 19, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 3

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

Preferably, the reading is automatically started when the temperature input signal exceeds a predetermined threshold value, and the disconnection of the temperature sensor is automatically detected. desirable.

Claims (4)

[Claims] When automatically measuring the temperature of a high-temperature object batchwise using a temperature sensor, a temperature input signal from the temperature sensor is automatically read every moment and continuously stored as time-series data. Performing a predetermined number of sequences from the stored time-series continuous data and sequentially performing an equilibrium point discrimination operation; and performing an averaging process on the obtained equilibrium point discrimination sequence to measure the temperature. An automatic temperature measurement method for a high-temperature object, comprising: a step of obtaining a value; and a step of outputting the obtained temperature measurement value. 2. The high-temperature object according to claim 1, wherein the following formulas (A) and (B) are used for the calculation of the equilibrium point, and the following formula (C) is used for the calculation of the measured temperature value. Automatic temperature measurement method. | T _i −T _{i + 1} | ≦ α (i = j,... J + m−1)... (A) Max (T _j, T _{j + 1,} ... T _{j + m} ) −Min (T _{j, T j + 1, ...} T j + m) ≦ β (j = 1, ... n-m) .................. (B) T * = (ΣT i -Max T i -Min T i) / (M-2) (i = k,... K + m) (C) where α, β: parameters, T ^* : temperature measurement values. 3. The method according to claim 1, wherein the reading is automatically started when the temperature input signal exceeds a predetermined threshold value. 4. The method for automatically measuring a temperature of a high-temperature object according to claim 1, wherein the disconnection of the temperature sensor is automatically detected.