JP2013127088A - Reliability monitoring device and reliability monitoring method of continuous hot-dip galvanizing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reliability monitoring device and a reliability monitoring method of a continuous hot-dip galvanizing line capable of monitoring the reliability of a measured value by a coating weight gauge or an alloying degree gauge without changing the constitution of the coating weight gauge.SOLUTION: In a continuous hot-dip galvanizing apparatus for manufacturing continuously a galvanized steel sheet, when a pure galvanized steel sheet is manufactured to the same steel strip, a zinc coating weight is measured by a coating weight gauge for measuring the coating weight by using a fluorescent X-ray measured value of zinc adhering to the steel strip after being dipped into a molten zinc bath, and further, when a hot-dip galvannealed steel sheet is manufactured, an alloying degree and a coating weight are measured by an alloying degree gauge for determining the alloying degree and the coating weight by using an X-ray diffraction pattern of iron contained in an alloy layer formed on the steel strip after being dipped into the molten zinc bath and alloyed, and the reliability of a measured value by the coating weight gauge or the alloying degree gauge is monitored based on a deviation between the coating weight measured by the coating weight gauge and the coating weight measured by the alloying degree gauge.

Description

  The present invention is a continuous hot-dip galvanizing facility (line) for continuously producing galvanized steel sheets, measured values measured by an adhesion meter and an alloying degree meter arranged downstream of a zinc tank holding a hot-dip zinc bath. The present invention relates to a reliability monitoring device and a reliability monitoring method for a continuous hot-dip galvanizing facility for monitoring the reliability of the steel.

As equipment for continuously producing a galvanized steel sheet, for example, there is a production equipment for hot dip galvanized steel sheet as described in Patent Document 1 (hereinafter sometimes referred to as “continuous galvanized equipment”). Proposed.
In the continuous hot dip galvanizing facility described in Patent Document 1, first, as shown in FIG. 5, a zinc bath (pot) holding a hot dip zinc bath (hereinafter sometimes referred to as “plating bath 6”). ) The steel strip S annealed in the previous step is continuously supplied into 4 and the steel strip S is immersed in the plating bath 6 to adhere the plating. Then, the traveling direction of the steel strip S is changed vertically upward by the sink roll 34 disposed in the plating bath 6, and the steel strip S to which plating is attached is pulled up above the plating bath 6. In addition, FIG. 5 is a figure which shows the structure of a general continuous hot dip galvanization equipment.

Next, with respect to the steel strip S that has been deposited and pulled up above the plating bath 6, the amount of plating deposited is adjusted by wiping (gas wiping) with the gas injected by the gas wiping device 8, and galvanized. Manufacture steel sheets.
In FIG. 5, a support roll 36 for stabilizing the traveling line of the steel strip S supplied into the plating bath 6 from obliquely upward to downward is shown. Here, the support roll 36 also has a function of suppressing warpage generated in the steel strip S by sandwiching both front and back surfaces of the steel strip S.

In such a continuous hot dip galvanizing facility, generally, there are many cases where the adhesion amount of the plating to the steel strip S is measured using an adhesion amount meter and an alloying degree meter arranged downstream of the zinc tank 4. .
Here, the adhesion amount meter is a sensor capable of measuring the adhesion amount using a measured value of zinc (Zn) adhering to the steel strip S using, for example, a fluorescent X-ray non-dispersion method. Such an adhesion meter using fluorescent X-rays is suitable for measuring the adhesion amount of a single metal, and is used when manufacturing a hot dip galvanized steel sheet (GI) as a galvanized steel sheet. It is done. Specifically, the plating adhesion amount is measured using a steel sheet having a known zinc adhesion amount as a calibration curve.

On the other hand, in alloyed hot dip galvanizing, since the plating layer is made of zinc and iron, the component of the steel sheet is iron. Therefore, in order to measure the amount of iron only in the plated portion, measurement by fluorescent X-rays There is a problem that the value is not available. For this reason, in alloying hot dip galvanization, it is difficult to use an adhesion meter by fluorescent X-rays, and an alloying degree meter using an X-ray diffraction method is used. This is a method for obtaining the Fe concentration (alloying degree) and the amount of plating adhesion from the X-ray diffraction pattern of iron (Fe) during plating (see Non-Patent Document 1). Also in this method, a material having a known degree of alloying (iron concentration) and a known adhesion amount is used as a calibration curve.
In addition, the manufacture of the alloyed hot-dip galvanized steel sheet (GA) was different from the manufacture of the pure galvanized steel sheet (GI), and the steel strip S after gas wiping was heated in the alloying furnace 10 to deposit zinc. The steel strip S is alloyed.

As described above, the adhesion principle using the fluorescent X-ray and the alloying degree meter using the X-ray diffraction method have different measurement principles. In an adhesion meter using fluorescent X-rays, a material in which the adhesion amount of one element is changed is usually registered as a calibration curve, and a measured value is converted into an adhesion amount. For this reason, it is suitable for the measurement of the amount of pure metal deposited, but in the case of an alloy, it is necessary to use a calibration curve for the material with a fixed component ratio and the amount of deposited material changed. It is not suitable for measuring the amount of zinc plating. Therefore, in general, only one type of calibration curve corresponding to a pure galvanized steel sheet is registered in the adhesion meter using fluorescent X-rays in the hot dip galvanizing line.
On the other hand, the alloying degree meter measures the Fe concentration (alloying degree) and the plating adhesion amount using an iron X-ray diffraction pattern while using a material having a known iron concentration and adhesion amount as a calibration curve.

Japanese Patent Laid-Open No. 2003-231959

Kawatetsu Steel Technical Report 18 (1986) "Method for continuous measurement of Fe concentration in hot-dip galvanized layers"

Like the conventional continuous hot dip galvanizing equipment mentioned above, when using either an adhesion meter or an alloying degree meter depending on the type of plated steel sheet to be manufactured, in the state where one measuring device is used, the other measurement The device is not used.
On the other hand, by using the galvanized adhesion amount measured by the adhesion meter and the galvanized adhesion amount measured by the alloying meter without using the adhesion meter and the alloying meter separately, It is conceivable to monitor the reliability of the measurement values measured by the adhesion meter and the alloying degree meter. This is due to the fact that it is suitable for the prevention of shipment of plated steel sheets with deteriorated quality to detect anomalies occurring in the adhesion meter or the alloying degree meter at an early stage and to interrupt or stop the production. .

  As described above, the measured value measured by the adhesion meter and the alloying degree meter by using the measured value of the galvanized adhesion amount measured by the adhesion meter and the measured galvanization adhesion amount measured by the alloying degree meter. In the case of a configuration in which only one type of calibration curve corresponding to a pure galvanized steel sheet is registered, the composition of the adhesion meter is an alloy as a galvanized steel sheet. When producing a galvannealed steel sheet, a situation occurs in which the galvanized adhesion amount measured by the adhesion meter and the galvanized adhesion amount measured by the alloying degree meter are greatly different.

On the other hand, when manufacturing galvannealed steel sheets as galvanized steel sheets, in order to improve measurement accuracy, for example, both galvanized steel sheets and alloying degree meters are compatible with pure galvanized steel sheets. It is conceivable to register two types of calibration curves corresponding to the calibrated hot-dip galvanized steel sheet and switch the two types of calibration curves according to the type of the steel sheet.
However, in order to make the deposit meter configuration so that two types of calibration curves can be registered, it is necessary to make modifications that require high costs by the manufacturer of the adherence meter, etc. There is a risk that the cost will increase.
The present invention has been made paying attention to the above problems, and monitors the reliability of measured values measured by the adhesion meter and the alloying degree meter without changing the configuration of the adhesion meter. It is an object to provide a reliability monitoring device and a reliability monitoring method for a continuous hot dip galvanizing facility.

In order to solve the above-mentioned problems, among the present inventions, the invention described in claim 1 is the fluorescent X of zinc adhering to a steel strip after being immersed in a molten zinc bath when producing a pure galvanized steel sheet. An adhesion meter that measures the amount of adhesion using the line measurement value, and an alloy layer formed on the steel strip after being immersed and alloyed in the molten zinc bath when producing an alloyed hot-dip galvanized steel sheet An alloying degree meter for obtaining an alloying degree and an adhesion amount using an X-ray diffraction pattern of iron included, and provided in a continuous hot dip galvanizing facility for continuously producing a galvanized steel sheet,
For the same steel strip, measure the adhesion amount with the adhesion meter, measure the alloying degree and adhesion amount with the alloying degree meter,
Based on the deviation between the adhesion amount measured by the adhesion meter and the alloying degree and adhesion amount measured by the alloying meter, the reliability of the measured value of the adhesion meter or the alloying meter is determined. A reliability monitoring device for a continuous hot-dip galvanizing line, comprising a reliability monitoring unit for monitoring.

According to the present invention, during the manufacture of the galvanized steel sheet, for the same steel strip, the adhesion amount is measured with an adhesion meter and the alloying degree and the adhesion amount are measured with an alloying degree meter, and the reliability monitoring unit is Based on the deviation between the adhesion amount measured by the adhesion meter and the adhesion amount measured by the alloying meter, the reliability of the measured value of the adhesion meter or alloying meter is monitored.
For this reason, regardless of the type of galvanized steel sheet to be manufactured in the continuous hot dip galvanizing line, by using the measured value measured with the adhesion meter and the measured value measured with the alloying degree meter, the configuration of the adhesion meter can be configured. Without changing, it is possible to monitor the reliability of the measured value of the adhesion meter or the alloying degree meter.

  Next, of the present invention, the invention described in claim 2 is the invention described in claim 1, wherein the reliability monitoring unit manufactures an alloyed hot-dip galvanized steel sheet as the galvanized steel sheet. The adhesion measured by the adhesion meter according to a conversion formula obtained in advance showing the correlation between the degree of alloying measured by the alloying meter and the adhesion amount and the adhesion amount measured by the adhesion meter. A corrected adhesion amount measurement value calculation unit that calculates a corrected adhesion amount measurement value with the amount corrected; a corrected adhesion amount measurement value calculated by the correction adhesion amount measurement value calculation unit; and the adhesion amount measured by the alloying degree meter And a reliability determination unit that determines that the reliability of the measurement value of the alloying degree meter is lowered when the deviation is equal to or greater than a preset deviation threshold value.

According to the present invention, when manufacturing an alloyed hot dip galvanized steel sheet, the corrected adhesion amount measurement value calculation unit included in the reliability monitoring unit measures the adhesion amount measured by the alloying degree meter and the adhesion amount measured by the adhesion amount meter. The corrected adhesion amount measurement value obtained by correcting the adhesion amount measured by the adhesion amount meter is calculated by a conversion formula obtained in advance representing the correlation with the above. In addition to this, when the reliability determination unit provided in the reliability monitoring unit has a deviation between the calculated corrected adhesion amount measurement value and the degree of alloying and the adhesion amount measured with the alloying degree meter is equal to or greater than a preset deviation threshold. Further, it is determined that the reliability of the measured value of the alloying degree meter is lowered.
For this reason, when manufacturing an alloyed hot-dip galvanized steel sheet without changing the configuration of the adhesion meter to a configuration that can register two types of calibration curves, the measurement accuracy by the adhesion meter is improved, It becomes possible to accurately monitor the reliability of the measured value of the alloying meter.

Next, among the present inventions, the invention described in claim 3 is the invention described in claim 1 or 2, wherein the reliability monitoring unit manufactures a pure galvanized steel sheet as the galvanized steel sheet. Is characterized in that the alloying degree and the adhesion amount are measured by the alloying degree meter only when the adhesion amount measured by the adhesion amount meter is less than a preset adhesion amount threshold value. .
According to the present invention, when the reliability monitoring unit manufactures a pure galvanized steel sheet as a galvanized steel sheet, the alloying degree meter is used only when the adhesion amount measured by the adhesion meter is less than a preset adhesion amount threshold value. Measure the degree of alloying and the amount of adhesion.
For this reason, it is possible to reduce the load applied to the alloying degree meter in a state where the adhesion amount measured by the adhesion amount meter is large, and alloying in a state where the measurement accuracy of the alloying degree meter is lowered. It becomes possible to prevent the use of the meter.

Next, among the present inventions, the invention described in claim 4 uses the fluorescent X-ray measurement value of zinc adhering to the steel strip after being immersed in a molten zinc bath when producing a pure galvanized steel sheet. An adhesion meter for measuring the adhesion amount and iron contained in the alloy layer formed in the steel strip after being immersed in the molten zinc bath and alloyed when producing an alloyed hot-dip galvanized steel sheet An alloying degree meter that determines the degree of alloying and the amount of adhesion using the X-ray diffraction pattern of, and for a continuous hot dip galvanizing equipment for continuously producing a galvanized steel sheet,
For the same steel strip, measure the adhesion amount with the adhesion meter, measure the alloying degree and adhesion amount with the alloying degree meter,
Based on the deviation between the adhesion amount measured by the adhesion meter and the alloying degree and adhesion amount measured by the alloying meter, the reliability of the measured value of the adhesion meter or the alloying meter is determined. A method for monitoring reliability of a continuous hot-dip galvanizing line, comprising a reliability monitoring step for monitoring.

According to the present invention, at the time of manufacturing the galvanized steel sheet, for the same steel strip, the adhesion amount is measured with an adhesion meter and the alloying degree and the adhesion amount are measured with an alloying degree meter. Based on the deviation between the adhesion amount measured by the adhesion meter and the adhesion amount measured by the alloying meter, the reliability of the measured value of the adhesion meter or alloying meter is monitored.
For this reason, regardless of the type of galvanized steel sheet to be manufactured in the continuous hot dip galvanizing line, by using the measured value measured with the adhesion meter and the measured value measured with the alloying degree meter, the configuration of the adhesion meter can be configured. Without changing, it is possible to monitor the reliability of the measured value of the adhesion meter or the alloying degree meter.

  Next, among the present inventions, the invention described in claim 5 is the invention described in claim 4, wherein the reliability monitoring step is to manufacture an alloyed hot-dip galvanized steel sheet as the galvanized steel sheet. The adhesion measured by the adhesion meter according to a conversion formula obtained in advance showing the correlation between the degree of alloying measured by the alloying meter and the adhesion amount and the adhesion amount measured by the adhesion meter. A corrected adhesion amount measurement value calculation step for calculating a corrected adhesion amount measurement value obtained by correcting the amount, a corrected adhesion amount measurement value calculated in the correction adhesion amount measurement value calculation step, and the adhesion amount measured by the alloying degree meter And a reliability determination step for determining that the reliability of the measured value of the alloying degree meter is lowered when the deviation is equal to or greater than a preset deviation threshold value.

According to the present invention, when manufacturing an alloyed hot-dip galvanized steel sheet, in the corrected adhesion amount measurement value calculation step included in the reliability monitoring step, the adhesion amount measured by the alloying degree meter and the adhesion amount measured by the adhesion amount meter The corrected adhesion amount measurement value obtained by correcting the adhesion amount measured by the adhesion amount meter is calculated by a conversion formula obtained in advance representing the correlation with the above. In addition to this, in the reliability determination step of the reliability monitoring step, when the deviation between the calculated corrected adhesion amount measured value and the adhesion amount measured by the alloying degree meter is equal to or larger than a preset deviation threshold value, alloying is performed. It is determined that the reliability of the measured value of the meter is lowered.
For this reason, when manufacturing an alloyed hot-dip galvanized steel sheet without changing the configuration of the adhesion meter to a configuration that can register two types of calibration curves, the measurement accuracy by the adhesion meter is improved, It becomes possible to accurately monitor the reliability of the measured value of the alloying meter.

  According to the present invention, during the production of a galvanized steel sheet, regardless of the type of galvanized steel sheet to be manufactured, the measured value measured with an adhesion meter and the measured value measured with an alloying degree meter are used. It becomes possible to monitor the reliability of the measurement value of the adhesion meter or the alloying degree meter without changing the configuration of the meter.

It is a figure which shows schematic structure of the continuous hot dip galvanization equipment provided with the reliability monitoring apparatus of this invention. It is a figure which shows the structure of a reliability monitoring apparatus. It is an example of the graph used for preparation of a conversion type | formula. It is a flowchart which shows the operation | movement which a reliability monitoring apparatus performs. It is a figure which shows the structure of a general continuous hot dip galvanization installation.

(First embodiment)
Hereinafter, a first embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described with reference to the drawings.
(Constitution)
First, the structure of the continuous hot dip galvanization equipment provided with the reliability monitoring apparatus of this embodiment is demonstrated using FIG.
(Schematic configuration of continuous galvanizing equipment)
FIG. 1 is a diagram showing a schematic configuration of a continuous hot dip galvanizing facility provided with a reliability monitoring device 1 of the present embodiment. In FIG. 1, the same components as those shown in FIG. 5 are denoted by the same reference numerals.
At the time of manufacturing a galvanized steel sheet, in a continuous hot dip galvanizing facility, a steel strip S that has been pretreated such as degreasing and washing in a pretreatment tank (not shown) before entering the plating layer from the snout 2 is subjected to an annealing furnace (not shown). Annealing.
Thereafter, the steel strip S annealed in the annealing furnace is immersed in a plating bath 6 (molten zinc bath) held in a zinc bath 4 (zinc pot), and the plating bath 6 is adhered to the steel strip S.

And the adhesion amount of plating is wiped (gas wiping) and adjusted by injecting gas from the gas wiping apparatus 8 to the steel strip S after being immersed in the plating bath 6.
Thereafter, in the case of producing an alloyed hot dip galvanized steel sheet (GA) as a galvanized steel sheet, the steel strip S is heated in the alloying furnace 10 to heat the steel strip S with zinc (Zn) and iron. An alloy layer made of (Fe) is formed.

On the other hand, when producing a pure galvanized steel sheet (GI) as a galvanized steel sheet, heating in the alloying furnace 10 is not performed.
That is, in the continuous hot dip galvanizing equipment shown in FIG. 1, a galvanized steel sheet (pure galvanized steel sheet, alloyed hot dip galvanized steel sheet) is manufactured through the above processes.
Here, the continuous hot dip galvanizing equipment shown in FIG. 1 has an adhesion meter 12 and an alloying degree meter 14 arranged on the downstream side of the alloying furnace 10.

The adhesion amount meter 12 can measure the adhesion amount of zinc adhering to the steel strip S after being immersed in the plating bath 6 (molten zinc bath) in the zinc bath 4 using a fluorescent X-ray non-dispersion method. It is a sensor. That is, when manufacturing a pure galvanized steel sheet, the adhesion amount meter 12 uses the fluorescent X-ray measurement value of zinc adhering to the steel strip S after being immersed in a molten zinc bath to determine the above adhesion amount. taking measurement. In addition, the measured value which the adhesion amount meter 12 measured is output to the gas wiping apparatus control part 16 which controls the injection amount of the gas from the gas wiping apparatus 8, for example, at the time of manufacture of a pure galvanized steel plate (GI) Used for feedback control of plating thickness.
Further, only one type of calibration curve corresponding to the pure galvanized steel sheet is registered in the adhesion meter 12.

  The alloying degree meter 14 uses an X-ray diffraction method to determine the alloying degree and plating adhesion of an alloy layer made of zinc and iron formed in the steel strip S after being immersed in the plating bath 6 (hot zinc bath). This is a sensor for obtaining the quantity. That is, when the alloying dip galvanized steel sheet is manufactured, the alloying degree meter 14 is made of iron contained in the alloy layer formed in the steel strip S after being immersed in the molten zinc bath and alloyed. Using the X-ray diffraction pattern, the degree of alloying and the amount of adhesion are determined. Note that the degree of alloying (iron content ratio) and the amount of plating adhesion measured by the alloying degree meter 14 are measured values measured by the alloying degree meter 14, for example, controlling the gas injection amount from the gas wiping device 8. Is output to the gas wiping device control unit 16 to be used for feedback control with respect to the plating thickness at the time of manufacturing the alloyed hot-dip galvanized steel sheet (GA). Further, the alloying degree and the plating adhesion amount measured by the alloying degree meter 14 are output to the alloying furnace control unit 18 that controls the alloying furnace 10, and at the time of producing the alloyed hot-dip galvanized steel sheet (GA). Used for feedback control on the degree of alloying.

In addition, in the alloying degree meter 14, two types of calibration curves corresponding to pure galvanized steel sheets and galvannealed steel sheets are registered. Note that it is relatively easy to register two types of calibration curves in the alloying degree meter 14. These two types of calibration curves are switched according to an information signal input from an operation determination unit described later.
Here, the measurement values measured by the adhesion amount meter 12 and the alloying degree meter 14 are output to the reliability monitoring unit 20 described later. In addition, the description regarding the structure of the reliability monitoring part 20 is mentioned later.

(Configuration of reliability monitoring device)
Hereinafter, the detailed configuration of the reliability monitoring apparatus 1 will be described with reference to FIG. 1 and FIG. 2. FIG. 2 is a diagram illustrating the configuration of the reliability monitoring apparatus 1.
As shown in FIG. 2, the reliability monitoring apparatus 1 can receive measurement values measured by the adhesion meter 12 and the alloying degree meter 14 and can transmit information signals to the alloying degree meter 14. The reliability monitoring unit 20 is provided. In the following explanation, the measured values measured by the adhesion meter 12 and the alloying degree meter 14 are measured for the same steel strip S by the adhesion meter 12 and the alloying degree meter. 14 describes the case where the above alloying degree and adhesion amount are measured.

The reliability monitoring unit 20 is formed using, for example, a PC (Personal Computer) or the like, and includes an operation determination unit 22, a corrected adhesion amount measurement value calculation unit 24, a stability determination unit 26, and a result collection unit 28. The reliability determination unit 30 and the alarm output unit 32 are provided.
The operation determination unit 22 determines whether the type of galvanized steel sheet manufactured in the continuous hot dip galvanizing facility is a pure galvanized steel sheet (GI) or an alloyed hot dip galvanized steel sheet (GA).
Here, the determination of the type of galvanized steel sheet by the operation determination unit 22 is performed using, for example, command information (information signal) input by an administrator or operator of the continuous hot dip galvanizing facility.

Moreover, if the operation determination part 22 determines the kind of galvanized steel plate manufactured in a continuous hot-dip galvanization equipment, the information signal containing the determined type of galvanized steel sheet will be referred to the alloying degree meter 14 and the corrected adhesion amount. It outputs to the measured value calculation part 24 and the reliability determination part 30.
The corrected adhesion amount measurement value calculation unit 24 stores a conversion formula obtained in advance. The corrected adhesion amount measurement value calculation unit 24 receives an input of a measurement value measured by the adhesion amount meter 12 and an information signal output by the operation determination unit 22. In addition, the description regarding the conversion formula memorize | stored in the correction | amendment adhesion amount measured value calculation part 24 is mentioned later.

  Further, the corrected adhesion amount measurement value calculation unit 24 includes information that the type of the galvanized steel sheet manufactured in the continuous hot dip galvanizing equipment is a pure galvanized steel sheet in the information signal input from the operation determination unit 22. If the measured value input from the adhesion amount meter 12 is used as the adhesion amount measured by the adhesion amount meter 12, an information signal including this adhesion amount is output to the result collecting unit 28.

  On the other hand, when the information signal input from the operation determination unit 22 includes information that the type of the galvanized steel sheet manufactured in the continuous galvanizing equipment is an alloyed galvanized steel sheet, that is, the galvanized steel sheet When manufacturing an alloyed hot-dip galvanized steel sheet, a corrected adhesion amount measurement value obtained by correcting the measurement value input from the adhesion amount meter 12 by a stored conversion formula is calculated. Then, the calculated corrected adhesion amount measurement value is used as the adhesion amount measured by the adhesion amount meter 12, and an information signal including the adhesion amount is output to the result collecting unit 28.

In the present embodiment, a case will be described in which the conversion formula stored in the corrected adhesion amount measurement value calculation unit 24 has individual conversion coefficients depending on the front side surface and the back side surface of the steel strip S. . The individual conversion coefficients corresponding to the front side surface and the back side surface are created and stored in advance in accordance with, for example, the measurement ability of the adhesion meter 12 and the alloying degree meter 14.
The stability determination unit 26 determines whether or not the measurement values measured by the adhesion amount meter 12 and the alloying degree meter 14 can be used for processing in the results collection unit 28 and the reliability determination unit 30, and the determination result is determined. The included information signal is output to the result collection unit 28.

Here, the determination by the stability determination unit 26 is performed, for example, on the condition that the steel strip S to be measured is the same steel strip S, the operation of the continuous hot dip galvanizing facility is stable, or the like. . The state in which the operation of the continuous hot dip galvanizing equipment is stable is, for example, a state in which the speed of the continuous hot dip galvanizing equipment has not changed or has hardly changed.
The result collection unit 28 receives the information signal output from the corrected adhesion amount measurement value calculation unit 24 and the stability determination unit 26 and the measurement value measured by the alloying degree meter 14.

  In addition, the result collection unit 28 uses the information signal output from the stability determination unit 26 as the measurement value measured by the adhesion meter 12 and the alloying degree meter 14 for processing in the result collection unit 28 and the reliability determination unit 30. When the information signal includes a result determined to be possible, the measurement value included in the information signal output from the corrected adhesion amount measurement value calculation unit 24 and the measurement value input from the alloying degree meter 14 are synchronized. Let The information signal including the two synchronized measurement values is output to the reliability determination unit 30.

The reliability determination unit 30 is based on the information signal input from the result collection unit 28 and the measurement value included in the information signal output from the corrected adhesion amount measurement value calculation unit 24 and the measurement value input from the alloying degree meter 14. The deviation from is continuously calculated. In the reliability determination unit 30, the deviation between the measurement value included in the information signal output from the corrected adhesion amount measurement value calculation unit 24 and the measurement value input from the alloying degree meter 14 is determined, for example, at a predetermined cycle. You may calculate intermittently.
In addition to this, when the information signal input from the operation determination unit 22 includes information that the type of the galvanized steel sheet manufactured in the continuous hot dip galvanizing equipment is a pure galvanized steel sheet, the calculated deviation Is less than a preset deviation threshold using the following determination formula (1).
| Zn1-ZnG1 | <ΔZn1 (1)

Here, in the above-described determination formula (1), “Zn1”, “ZnG1”, and “ΔZn1” are respectively defined as the following values.
Zn1: Measurement value included in the information signal output by the corrected adhesion amount measurement value calculation unit 24 ZnG1: Measurement value input from the alloying degree meter ΔZn1: Deviation threshold Note that the deviation threshold (ΔZn1) is, for example, These are experimentally measured values and theoretical values, which are set in advance.

On the other hand, when the information signal input from the operation determination unit 22 includes information that the type of the galvanized steel sheet manufactured in the continuous hot dip galvanizing equipment is an alloyed hot dip galvanized steel sheet, the calculated deviation Is less than a preset deviation threshold using the following determination formula (2).
| Zn2-ZnG2 | <ΔZn2 (2)

Here, in the above-described determination formula (2), “Zn2”, “ZnG2”, and “ΔZn2” are respectively defined as the following values.
Zn2: a measurement value included in the information signal output by the corrected adhesion amount measurement value calculation unit 24 ZnG2: a measurement value input from the alloying degree meter ΔZn2: a deviation threshold value The deviation threshold value ΔZn2 is the deviation threshold value ΔZn1 described above Similarly, for example, experimentally measured values and theoretical values are set in advance.
Specifically, the determination performed by the reliability determination unit 30 determines that the calculated deviation is less than the deviation threshold when the determination formula (1) or (2) is satisfied, and the determination formula (1) or When (2) is not established, it is determined that the calculated deviation is greater than or equal to the deviation threshold.

If the determination formula (1) or (2) is not satisfied and the calculated deviation is determined to be equal to or greater than the deviation threshold, the reliability determination unit 30 outputs an information signal including the determination result, Output to the alarm output unit 32.
Here, the calculated deviation is equal to or greater than the deviation threshold value, and further, the information signal input from the operation determination unit 22 includes information that the type of the galvanized steel sheet manufactured in the continuous hot dip galvanizing facility is a pure galvanized steel sheet. If it is included, the determination result that the reliability of the measured value of the adhesion meter 12 is reduced is added to the information signal output to the alarm output unit 32.

On the other hand, the calculated deviation is equal to or greater than the deviation threshold value, and further, the information signal input from the operation determination unit 22 indicates that the type of galvanized steel sheet manufactured in the continuous hot dip galvanizing facility is an alloyed hot dip galvanized steel sheet. Is included, the determination result that the reliability of the measured value of the alloying degree meter 14 is reduced is added to the information signal output to the alarm output unit 32.
When an information signal is input from the reliability determination unit 30, the alarm output unit 32 outputs an alarm by voice, display (warning text), or the like. Note that the alarm output from the alarm output unit 32 is, for example, an alarm that prompts an administrator or worker to stop the operation of the continuous galvanizing facility.

  In addition, the reliability monitoring part 20 compares the adhesion amount which the adhesion amount meter 12 measured with the preset adhesion amount threshold value, when manufacturing a pure galvanized steel plate (GI) as a galvanized steel plate. Then, only when the adhesion amount measured by the adhesion amount meter 12 is less than the adhesion amount threshold value, the degree of alloying and the adhesion amount are measured by the alloying degree meter 14. That is, when the adhesion amount measured by the adhesion amount meter 12 is equal to or larger than the adhesion amount threshold value, a command signal for stopping the measurement is output to the alloying degree meter 14. Here, the adhesion amount threshold is set according to the voltage rating of the alloying degree meter 14, for example.

(Conversion formula)
The conversion formula stored in the corrected adhesion amount measurement value calculation unit 24 will be described below with reference to FIGS. 1 and 2 and FIG. FIG. 3 is an example of a graph showing the correlation between the measured value of zinc (Zn) measured using the adhesion meter 12 and the measured value of zinc (Zn) measured using the alloying degree meter 14. It is an example of the graph used for preparation of a conversion type | formula.

When creating the graph shown in FIG. 3, first, a sample plate of an alloyed hot-dip galvanized steel sheet (GA) is prepared in which the zinc content contained in the alloy layer is adjusted to a preset value. . Then, the adhesion amount of zinc is measured at an off-line position using the alloying degree meter 14 with respect to the prepared sample plate. Next, with respect to the same sample plate, the adhesion amount of zinc is measured at an off-line position using the adhesion amount meter 12. In FIG. 3, the measured value of zinc (Zn) measured using the adhesion meter 12 is shown on the horizontal axis as “adherence meter Zn measured value (g / m ² )”. Similarly, in FIG. 3, the measured value of zinc (Zn) measured using the alloying degree meter 14 is shown as “alloying degree meter Zn measured value (g / m ² )” on the vertical axis.

As described above, after measuring the amount of zinc adhered to the sample plate a plurality of times (preferably three times or more, more preferably five times or more), using these measured values, the following formula (3) Create
Y = a · X + b (3)
Here, in the above formula (3), “Y”, “X”, “a”, and “b” are respectively defined as the following values.
Y: Measured value of zinc (Zn) measured using the alloying degree meter 14 (Zinc adhesion amount converted from iron content ratio and adhesion amount)
X: Measured value of zinc (Zn) measured using the adhesion amount meter 12 (adhesion amount)
a: slope of conversion coefficient b: intercept of conversion coefficient

Here, the slope a and the intercept b of the conversion coefficient are shown in FIG. 3 from a plurality of intersections of the measured value measured using the adhesion meter 12 and the measured value measured using the alloying degree meter 14. These average values are calculated and calculated based on a straight line indicating the calculated average values.
In this embodiment, as an example, a case will be described in which the slope a of the transform coefficient is “1.1575” and the intercept b of the transform coefficient is “5.6295”.
In the present embodiment, the adhesion amount threshold is set to 40.00 (g / m ² ) as an example from the value of “adherence amount Zn measured value” shown in FIG.

After creating the above equation (3), a conversion equation represented by the following equation (4) is created using the calculated slope a and intercept b of the conversion coefficient.
rmg = a · mg + b (4)
Here, in the conversion formula (4), “rmg” and “mg” are respectively defined as the following values. Note that “a” and “b” are the same as the above-described formula (3).
rmg: corrected adhesion amount measurement value calculated by the corrected adhesion amount measurement value calculation unit 24 mg: measured value (actual value) of zinc (Zn) measured using the adhesion amount meter 12

  As described above, the reliability monitoring unit 20 measures the amount of adhesion with the adhesion amount meter 12 and the degree of alloying with the alloying degree meter 14 for the same steel strip S at the time of manufacturing the galvanized steel sheet. In the state where the adhesion amount is measured, the zinc (adhesion amount) measurement value (Zn1, Zn2) measured by the adhesion amount meter 12 and the zinc (adhesion amount) measurement value (ZnG1) measured by the alloying degree meter 14 , ZnG2), the reliability of the measured value of the adhesion meter 12 or the alloying meter 14 is monitored based on deviations (| Zn1-ZnG1 |, | Zn2-ZnG2 |).

  Moreover, when the reliability monitoring part 20 manufactures an alloyed hot-dip galvanized steel plate (GA) as a galvanized steel plate by the above, the correction | amendment which correct | amended the adhesion amount measured with the adhesion amount meter 12 by the conversion formula calculated | required previously. A corrected adhesion amount measurement value calculation unit 24 for calculating the adhesion amount measurement value (Zn2) is provided. In addition to this, the reliability monitoring unit 20 determines the deviation (| Zn2) between the corrected adhesion amount measured value (Zn2) calculated by the corrected adhesion amount measured value calculation unit 24 and the adhesion amount (ZnG2) measured by the alloying degree meter 14. A reliability determination unit 30 that determines that the reliability of the measured value of the alloying degree meter 14 is lowered when −ZnG2 |) is equal to or greater than a preset deviation threshold (ΔZn2).

In addition, as described above, when the reliability monitoring unit 20 manufactures a pure galvanized steel sheet (GI) as the galvanized steel sheet, the adhesion amount measured by the adhesion amount meter 12 is less than a predetermined adhesion amount threshold value. Only the degree of alloying and the amount of adhesion are measured by the alloying degree meter 14.
The reliability monitoring unit 20 uses the corrected adhesion amount measurement value (Zn2) corrected by the conversion formula in which the conversion coefficient is switched according to the front side surface and the back side surface of the steel strip S, and uses the deviation (| Zn2-ZnG2 |) may be calculated.

(Operation)
Hereinafter, the operation performed by the reliability monitoring apparatus 1 of the present embodiment will be described with reference to FIGS. 1 to 3 and FIG. 4.
FIG. 4 is a flowchart showing an operation performed by the reliability monitoring apparatus 1.
When the reliability monitoring apparatus 1 starts operation (processing) during the manufacture of the galvanized steel sheet, first, in step S10, the stability determination unit 26 determines the measurement values measured by the adhesion amount meter 12 and the alloying degree meter 14. Then, it is determined whether or not it can be used for processing in the result collection unit 28 and the reliability determination unit 30.
In step S10, when the stability determination unit 26 determines that the measurement values measured by the adhesion meter 12 and the alloying degree meter 14 can be used for processing in the result collection unit 28 and the reliability determination unit 30, the reliability is determined. The operation performed by the monitoring device 1 proceeds to step S12.

On the other hand, when the stability determination unit 26 determines that the measurement values measured by the adhesion amount meter 12 and the alloying degree meter 14 are not usable for processing in the result collection unit 28 and the reliability determination unit 30, the reliability monitoring device The operation performed by 1 repeats the process of step S10.
In step S12, the operation determination part 22 determines whether the kind of galvanized steel plate manufactured in a continuous hot dip galvanizing facility is a pure galvanized steel plate (GI). That is, it is determined whether the type of the galvanized steel sheet is a pure galvanized steel sheet (GI) or an galvannealed steel sheet (GA).
In step S12, when the operation determination unit 22 determines that the type of the galvanized steel sheet is a pure galvanized steel sheet (GI), the operation performed by the reliability monitoring apparatus 1 proceeds to step S20.

On the other hand, if the operation determination part 22 determines in step S12 that the kind of galvanized steel sheet is not a pure galvanized steel sheet (GI), the operation | movement which the reliability monitoring apparatus 1 performs will transfer to step S30.
In step S <b> 20, the corrected adhesion amount measurement value calculation unit 24 outputs an information signal including the measurement value input from the adhesion amount meter 12 to the result collection unit 28. In step S20, when the corrected adhesion amount measurement value calculation unit 24 outputs an information signal to the result collection unit 28, the operation performed by the reliability monitoring device 1 proceeds to step S22.

In step S22, the result collection unit 28 synchronizes the measurement value (Zn1) included in the information signal output from the corrected adhesion amount measurement value calculation unit 24 with the measurement value (ZnG1) input from the alloying degree meter 14. The information signal including the two synchronized measurement values (Zn1, ZnG1) is output to the reliability determination unit 30. In step S22, when the performance collecting unit 28 outputs an information signal to the reliability determining unit 30, the operation performed by the reliability monitoring device 1 proceeds to step S24.
The process performed in step S22 is premised on the process in which the operation determination unit 22 determines that the type of the galvanized steel sheet is a pure galvanized steel sheet (GI) in step S12. The measured value input from the chemical meter 14 is a value measured using a calibration curve corresponding to a pure galvanized steel sheet.

In step S24, the reliability determination unit 30 deviates between the measurement value (Zn1) included in the information signal output from the corrected adhesion amount measurement value calculation unit 24 and the measurement value (ZnG1) input from the alloying degree meter 14. (| Zn1-ZnG1 |) is continuously calculated. When the deviation (| Zn1-ZnG1 |) is continuously calculated in step S24, the operation performed by the reliability monitoring apparatus 1 proceeds to step S26.
In step S26, the reliability determination unit 30 determines whether the calculated deviation (| Zn1-ZnG1 |) is less than a preset deviation threshold (ΔZn1) using the above-described determination formula (1). To do.
In step S26, when the reliability determination unit 30 determines that the calculated deviation (| Zn1-ZnG1 |) is less than a preset deviation threshold (ΔZn1), the operation performed by the reliability monitoring apparatus 1 is performed in step S20. Return to.

On the other hand, when the reliability determination unit 30 determines in step S26 that the calculated deviation (| Zn1-ZnG1 |) is greater than or equal to a preset deviation threshold (ΔZn1), the operation performed by the reliability monitoring apparatus 1 is as follows. Control goes to step S28.
In step S28, the warning output unit 32 outputs a warning by voice or display (warning text), etc., and prompts the manager or worker to stop the operation of the continuous hot dip galvanizing equipment. In step S28, when the alarm output unit 32 outputs an alarm, the operation performed by the reliability monitoring device 1 is terminated.
In the processing from step S24 to S28, the adhesion amount (ZnG1) measured by the adhesion amount meter 12 is less than a predetermined adhesion amount threshold value (in this embodiment, “40.00 (g / m ² )”). Only in this case, the degree of alloying and the amount of adhesion are measured by the alloying degree meter 14.

  In step S30, the corrected adhesion amount measurement value calculation unit 24 calculates a corrected adhesion amount measurement value obtained by correcting the measurement value (actual measurement value) input from the adhesion amount meter 12 by the above conversion formula (4). An information signal including the calculated corrected adhesion amount measurement value (Zn 2) is output to the result collection unit 28. In step S30, when the corrected adhesion amount measurement value calculation unit 24 outputs an information signal to the result collection unit 28, the operation performed by the reliability monitoring device 1 proceeds to step S32.

  In step S32, the result collection unit 28 corrects the measured adhesion amount (Zn2) included in the information signal output from the corrected adhesion amount measurement value calculation unit 24 and the measured value (ZnG2) input from the alloying degree meter 14. And outputs an information signal including the two synchronized measurement values (Zn2, ZnG2) to the reliability determination unit 30. In step S32, when the performance collecting unit 28 outputs an information signal to the reliability determining unit 30, the operation performed by the reliability monitoring apparatus 1 proceeds to step S34.

The process performed in step S32 is premised on the process in which the operation determination unit 22 determines in step S12 that the type of the galvanized steel sheet is an alloyed hot-dip galvanized steel sheet (GA). The measured value input from the alloying degree meter 14 is a value measured using a calibration curve corresponding to the alloyed hot-dip galvanized steel sheet.
In step S34, the reliability determination unit 30 deviates between the measurement value (Zn2) included in the information signal output from the corrected adhesion amount measurement value calculation unit 24 and the measurement value (ZnG2) input from the alloying degree meter 14. (| Zn2-ZnG2 |) is continuously calculated. When the deviation (| Zn2-ZnG2 |) is continuously calculated in step S34, the operation performed by the reliability monitoring apparatus 1 proceeds to step S36.

In step S36, the reliability determination unit 30 determines whether the calculated deviation (| Zn2-ZnG2 |) is less than a preset deviation threshold (ΔZn2) using the above-described determination formula (2). To do.
In step S36, when the reliability determination unit 30 determines that the calculated deviation (| Zn2-ZnG2 |) is less than a preset deviation threshold (ΔZn2), the operation performed by the reliability monitoring apparatus 1 is performed in step S30. Return to.

On the other hand, when the reliability determination unit 30 determines in step S36 that the calculated deviation (| Zn2-ZnG2 |) is greater than or equal to a preset deviation threshold (ΔZn2), the operation performed by the reliability monitoring apparatus 1 is as follows. Control goes to step S38.
In step S38, the warning output unit 32 outputs a warning by voice, display (warning text) or the like, and prompts the administrator or worker to stop the operation of the continuous hot dip galvanizing facility. In step S38, when the alarm output unit 32 outputs an alarm, the operation performed by the reliability monitoring device 1 ends.
In step S28 or step S38, the operation performed by the reliability monitoring apparatus 1 after the alarm output unit 32 outputs an alarm may be returned to step S10.

  As described above, the processes from step S24 to S28 and the processes from step S34 to S38 measure the above adhesion amount with the adhesion meter 12 for the same steel strip S during the manufacture of the galvanized steel sheet. In the state where the degree of alloying and the amount of adhesion are measured by the alloying degree meter 14, the amount of adhesion (Zn1, Zn2) measured by the adhesion amount meter 12 and the amount of adhesion (ZnG1) measured by the alloying degree meter 14 , Corresponding to a reliability monitoring step of monitoring the reliability of the measured value of the adhesion meter 12 or the alloying degree meter 14 based on the deviation from ZnG2).

Further, as described above, step S30 included in the reliability monitoring step calculates a corrected adhesion amount measurement value (Zn2) obtained by correcting the adhesion amount measured by the adhesion amount meter 12 by the conversion equation (4) obtained in advance. This corresponds to the corrected adhesion amount measurement value calculation step.
Further, as described above, step S36 of the reliability monitoring step includes the deviation (| Zn2) between the corrected adhesion amount measurement value (Zn2) calculated in step S30 and the adhesion amount (ZnG2) measured by the alloying degree meter 14. This corresponds to a reliability determination step in which it is determined that the reliability of the measured value of the alloying degree meter 14 is lowered when −ZnG2 |) is equal to or greater than a preset deviation threshold (ΔZn2).

As described above, in the reliability monitoring step, when a pure galvanized steel sheet (GI) is manufactured as the galvanized steel sheet, the adhesion amount measured by the adhesion meter 12 is less than a preset adhesion amount threshold value. Only the degree of alloying and the amount of adhesion are measured by the alloying degree meter 14.
In the reliability monitoring step, the deviation (| Zn2) is calculated using the corrected adhesion amount measurement value (Zn2) corrected by the conversion equation in which the conversion coefficient is switched according to the front side surface and the back side surface of the steel strip S. -ZnG2 |) may be calculated.

(Effects of the first embodiment)
The effects of this embodiment are listed below.
(1) In the reliability monitoring device 1 of the present embodiment, when the galvanized steel sheet is manufactured, the above adhesion amount is measured with the adhesion amount meter 12 and the above alloying degree meter 14 with respect to the same steel strip S. The alloying degree and the adhesion amount are calculated. In addition to this, the reliability monitoring unit 20 determines the adhesion amount meter 12 or the alloying degree meter 14 based on the deviation between the adhesion amount measured by the adhesion amount meter 12 and the adhesion amount of zinc obtained from the alloying degree meter 14. Monitor the reliability of measurements.

For this reason, regardless of the type of galvanized steel sheet produced in the continuous hot dip galvanizing line, the measured value measured by the adhesion meter 12 and the measured value measured by the alloying degree meter 14 are used. It is possible to monitor the reliability of the measurement values of the adhesion meter 12 and the alloying degree meter 14 without changing the configuration.
As a result, it is possible to continuously perform a mutual check (cross check) on the adhesion amount meter 12 and the alloying degree meter 14 using the adhesion amount meter 12 and the alloying degree meter 14. It is possible to detect an abnormality occurring in the chemical meter 14 at an early stage.
Thereby, the reliability monitoring apparatus 1 of the present embodiment outputs an alarm or the like when an abnormality occurs in the adhesion amount meter 12 or the alloying degree meter 14 regardless of the type of galvanized steel sheet to be manufactured. Therefore, it is possible to interrupt or stop the production, which is suitable for preventing the shipment of the plated steel sheet having deteriorated quality.

(2) In the reliability monitoring apparatus 1 of the present embodiment, when manufacturing an alloyed hot-dip galvanized steel sheet (GA), the corrected adhesion amount measurement value calculation unit 24 calculates the adhesion amount meter 12 according to a conversion formula obtained in advance. A corrected adhesion amount measurement value obtained by correcting the adhesion amount measured in step (1) is calculated. In addition to this, the reliability judgment unit 30 sets a deviation between the corrected adhesion amount measurement value calculated by the corrected adhesion amount measurement value calculation unit 24 and the alloying degree and the adhesion amount measured by the alloying degree meter 14 in advance. When it is equal to or greater than the threshold value, it is determined that the reliability of the measured value of the alloying degree meter 14 is lowered.
For this reason, when manufacturing an alloyed hot-dip galvanized steel sheet (GA) without changing the configuration of the adhesion meter 12 to a configuration in which two types of calibration curves can be registered, the measurement accuracy by the adhesion meter 12 Thus, the reliability of the measured value of the alloying degree meter 14 can be accurately monitored.
As a result, it is not necessary to modify the adhesion meter 12 at a high cost, and an increase in the manufacturing cost of the plated steel sheet can be suppressed.

(3) In the reliability monitoring apparatus 1 according to the present embodiment, when the reliability monitoring unit 20 manufactures a pure galvanized steel sheet (GI) as a galvanized steel sheet, the adhesion amount measured by the adhesion meter 12 is determined in advance. The alloying degree and the adhesion amount are measured by the alloying degree meter 14 only when it is less than the set adhesion amount threshold.
For this reason, it is possible to reduce the load applied to the alloying degree meter 14 in a state where the adhesion amount measured by the adhesion amount meter 12 is large, and the measurement accuracy of the alloying degree meter 14 is reduced. It becomes possible to prevent the use of the alloying degree meter 14.
As a result, it is possible to suppress damage to the alloying degree meter 14 and suppress an increase in maintenance / operation costs of the continuous hot dip galvanizing line, and a value with a large error as a measured value of the alloying degree meter 14. Can be suppressed from being measured.

(4) In the reliability monitoring device 1 of the present embodiment, the reliability monitoring unit 20 corrects the corrected adhesion amount measurement value corrected by the conversion formula in which the conversion coefficient is switched according to the front side surface and the back side surface of the steel strip S. Is used to calculate the deviation between the measurement value measured by the adhesion meter 12 and the measurement value measured by the alloying degree meter 14.
For this reason, since it becomes possible to obtain a corrected adhesion amount measurement value obtained by correcting the measurement value measured by the adhesion amount meter 12 by a conversion formula corresponding to the surface of the steel strip S, the measurement accuracy by the adhesion amount meter 12 is improved. It becomes possible to make it.
As a result, it is possible to improve the accuracy of mutual check (cross check) on the adhesion amount meter 12 and the alloying degree meter 14 using the adhesion amount meter 12 and the alloying degree meter 14.

(5) In the reliability monitoring method of the present embodiment, when the galvanized steel sheet is manufactured, the above adhesion amount is measured by the adhesion amount meter 12 with respect to the same steel strip S, and the degree of zinc is measured from the alloying degree meter 14. In the state where the adhesion amount is measured, in the reliability monitoring step, the adhesion amount meter is based on the deviation between the measured value of zinc measured by the adhesion amount meter 12 and the measured value of zinc measured by the alloying degree meter 14. The reliability of the measured value of 12 or alloying degree meter 14 is monitored.
For this reason, regardless of the type of galvanized steel sheet produced in the continuous hot dip galvanizing line, the measured value measured by the adhesion meter 12 and the measured value measured by the alloying degree meter 14 are used. It is possible to monitor the reliability of the measured values of the adhesion amount meter 12 and the alloying degree meter 14 without changing the configuration.

As a result, it is possible to continuously perform a mutual check (cross check) on the adhesion amount meter 12 and the alloying degree meter 14 using the adhesion amount meter 12 and the alloying degree meter 14. It is possible to detect an abnormality occurring in the chemical meter 14 at an early stage.
Thereby, the reliability monitoring method according to the present embodiment outputs an alarm or the like when an abnormality occurs in the adhesion meter 12 or the alloying degree meter 14 regardless of the type of galvanized steel sheet to be manufactured. Thus, it becomes possible to interrupt or stop the production, which is a suitable method for preventing the shipment of the plated steel sheet having deteriorated quality.

(6) In the reliability monitoring method of the present embodiment, when an alloyed hot-dip galvanized steel sheet (GA) is manufactured, measurement is performed by the adhesion amount meter 12 using the conversion formula obtained in advance in the corrected adhesion amount measurement value calculation step. A corrected adhesion amount measurement value obtained by correcting the adhered adhesion amount is calculated. In addition, in the reliability determination step, the deviation between the corrected adhesion amount measured value calculated by the corrected adhesion amount measured value calculation unit 24 and the zinc adhesion amount measured by the alloying degree meter 14 is equal to or greater than a preset deviation threshold value. In some cases, it is determined that the reliability of the measured value of the alloying degree meter 14 is lowered.

For this reason, when manufacturing an alloyed hot-dip galvanized steel sheet (GA) without changing the configuration of the adhesion meter 12 to a configuration in which two types of calibration curves can be registered, the measurement accuracy by the adhesion meter 12 Thus, the reliability of the measured value of the alloying degree meter 14 can be accurately monitored.
As a result, it is not necessary to modify the adhesion meter 12 at a high cost, and an increase in the manufacturing cost of the plated steel sheet can be suppressed.

(7) In the reliability monitoring method of the present embodiment, when manufacturing a pure galvanized steel sheet (GI) as a galvanized steel sheet in the reliability monitoring step, the adhesion amount measured by the adhesion meter 12 is preset. Only when it is less than the adhesion amount threshold value, the degree of alloying and the adhesion amount are measured by the alloying degree meter 14.
For this reason, it is possible to reduce the load applied to the alloying degree meter 14 in a state where the adhesion amount measured by the adhesion amount meter 12 is large, and the measurement accuracy of the alloying degree meter 14 is reduced. It becomes possible to prevent the use of the alloying degree meter 14.
As a result, it is possible to suppress damage to the alloying degree meter 14 and suppress an increase in maintenance / operation costs of the continuous hot dip galvanizing line, and a value with a large error as a measured value of the alloying degree meter 14. Can be suppressed from being measured.

(8) In the reliability monitoring method of the present embodiment, in the reliability monitoring step, the corrected adhesion amount measurement value corrected by the conversion formula in which the conversion coefficient is switched according to the front side surface and the back side surface of the steel strip S is used. Then, the deviation between the measured value measured by the adhesion amount meter 12 and the measured value measured by the alloying degree meter 14 is calculated.
For this reason, since it becomes possible to obtain a corrected adhesion amount measurement value obtained by correcting the measurement value measured by the adhesion amount meter 12 by a conversion formula corresponding to the surface of the steel strip S, the measurement accuracy by the adhesion amount meter 12 is improved. It becomes possible to make it.
As a result, it is possible to improve the accuracy of mutual check (cross check) on the adhesion amount meter 12 and the alloying degree meter 14 using the adhesion amount meter 12 and the alloying degree meter 14.

(Modification)
Hereinafter, modifications of the present embodiment will be listed.
(1) In the reliability monitoring device 1 of the present embodiment, the conversion coefficient of the conversion formula is switched according to the front side surface and the back side surface of the steel strip S, but the present invention is not limited to this, and the conversion formula The conversion coefficient may be one type.
(2) Although the alloying degree meter 14 has a configuration in which two types of calibration curves corresponding to the pure galvanized steel plate and the galvannealed steel plate are registered, it is not limited to this. That is, the alloying degree meter 14 is configured so that only one type of calibration curve corresponding to a pure galvanized steel sheet is registered, as with the adhesion meter 12, and an alloyed hot-dip galvanized steel sheet (GA) is manufactured. In this case, the measured value of zinc measured by the alloying degree meter 14 may be corrected by a preset conversion formula for the alloying degree meter 14.
(3) In the reliability monitoring method of the present embodiment, the conversion coefficient of the conversion formula is switched according to the front side surface and the back side surface of the steel strip S, but the present invention is not limited to this. One type of conversion coefficient may be used.

DESCRIPTION OF SYMBOLS 1 Reliability monitoring apparatus 2 Snout 4 Zinc tank 6 Plating bath 8 Gas wiping apparatus 10 Alloying furnace 12 Adhesion meter 14 Alloying degree meter 16 Gas wiping apparatus control part 18 Alloying furnace control part 20 Reliability monitoring part 22 Operation determination Section 24 Corrected adhesion amount measurement value calculation section 26 Stability determination section 28 Results collection section 30 Reliability determination section 32 Alarm output section 34 Sink roll 36 Support roll S Steel strip

Claims (5)

When manufacturing pure galvanized steel sheet, an adhesion meter that measures the amount of adhesion using a fluorescent X-ray measurement value of zinc adhering to a steel strip after being immersed in a hot dip galvanizing bath, and an alloyed galvanized steel sheet Alloy for obtaining the degree of alloying and the amount of adhesion using the X-ray diffraction pattern of iron contained in the alloy layer formed in the steel strip after being immersed in the molten zinc bath and alloying A degree meter, and is provided in a continuous hot dip galvanizing facility for continuously producing galvanized steel sheets,
For the same steel strip, measure the adhesion amount with the adhesion meter, measure the alloying degree and adhesion amount with the alloying degree meter,
Based on the deviation between the adhesion amount measured by the adhesion meter and the alloying degree and adhesion amount measured by the alloying meter, the reliability of the measured value of the adhesion meter or the alloying meter is determined. A reliability monitoring device for continuous hot-dip galvanizing equipment, comprising a reliability monitoring unit for monitoring.   The reliability monitoring unit, when producing an alloyed hot-dip galvanized steel sheet as the galvanized steel sheet, measures the alloying degree and adhesion amount measured by the alloying degree meter and the adhesion measured by the adhesion amount meter. A corrected adhesion amount measurement value calculation unit for calculating a corrected adhesion amount measurement value obtained by correcting the adhesion amount measured by the adhesion amount meter by a conversion formula obtained in advance representing a correlation with the amount, and calculation of the corrected adhesion amount measurement value When the deviation between the corrected adhesion amount measurement value calculated by the unit and the adhesion amount measured with the alloying degree meter is equal to or greater than a preset deviation threshold value, the reliability of the measurement value of the alloying degree decreases. A reliability monitoring device for a continuous hot dip galvanizing facility according to claim 1, further comprising: a reliability determination unit that determines that the temperature is high.   In the case of producing a pure galvanized steel sheet as the galvanized steel sheet, the reliability monitoring unit is configured to measure the alloying degree meter only when the adhesion amount measured by the adhesion amount meter is less than a predetermined adhesion amount threshold value. The reliability monitoring device for continuous hot dip galvanizing equipment according to claim 1, wherein the degree of alloying and the amount of adhesion are measured by the method. When manufacturing pure galvanized steel sheet, an adhesion meter that measures the amount of adhesion using a fluorescent X-ray measurement value of zinc adhering to a steel strip after being immersed in a hot dip galvanizing bath, and an alloyed galvanized steel sheet Alloy for obtaining the degree of alloying and the amount of adhesion using the X-ray diffraction pattern of iron contained in the alloy layer formed in the steel strip after being immersed in the molten zinc bath and alloying A continuous hot dip galvanizing facility that continuously produces galvanized steel sheets,
For the same steel strip, measure the adhesion amount with the adhesion meter, measure the alloying degree and adhesion amount with the alloying degree meter,
Based on the deviation between the adhesion amount measured by the adhesion meter and the alloying degree and adhesion amount measured by the alloying meter, the reliability of the measured value of the adhesion meter or the alloying meter is determined. A method for monitoring reliability of a continuous hot-dip galvanizing facility, comprising a reliability monitoring step for monitoring.   In the reliability monitoring step, when producing an alloyed hot-dip galvanized steel sheet as the galvanized steel sheet, the degree of alloying and adhesion amount measured by the alloying degree meter and the adhesion amount measured by the adhesion amount meter A corrected adhesion amount measurement value calculating step for calculating a corrected adhesion amount measurement value obtained by correcting the adhesion amount measured by the adhesion amount meter according to a conversion formula obtained in advance representing a correlation with the amount, and calculation of the corrected adhesion amount measurement value When the deviation between the corrected adhesion amount measured value calculated in step and the adhesion amount measured with the alloying degree meter is equal to or larger than a preset deviation threshold, the reliability of the measurement value of the alloying degree decreases. And a reliability determination step for determining that the continuous hot-dip galvanizing facility is being monitored.

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