KR100785244B1 - Measuring method of oil film thickness for coil strip - Google Patents

Abstract

A method of measuring oil film thickness for a coil strip is provided to measure the oil film thickness safely and exactly in spite of environmental changes and elapsed time. A method of measuring oil film thickness for a coil strip includes the steps of: installing a standard gauge for providing a reference value required to compensate quality of material of the running coil strip and the luminance of ultraviolet or infrared such that the standard gauge can be scanned by an oil film thickness sensor; detecting whether the oiled coil strip normally enters a running line in the state that the oil film thickness sensor is on standby at the specified location; setting up the detailed information of the coil strip for measuring the oil film thickness of the coil strip entering the running line; and measuring and storing the oil film thickness in the length and the width directions of the running coil strip respectively in the sate that a normal operation is accomplished by checking the line velocity of the running coil strip.

Description

Measuring method of oil content of steel sheet {Measuring method of oil film thickness for coil strip}

1 is a schematic configuration diagram of a conventional oil induction measurement device by the ultraviolet absorption method

Figure 2 is a perspective view showing an embodiment of the steel sheet induction measurement device according to the present invention

3A is an exemplary view showing a scan operation performed by the oil flow rate measuring apparatus of FIG.

Figure 3b is an exemplary view showing a scan operation made by another embodiment of the present invention in which three oil flow rate measuring sensors are installed

Figure 4 is an overall flow chart made in the method of measuring the steel plate oil in accordance with the present invention

<Explanation of symbols for the main parts of the drawings>

3: steel sheet 11: oiler 14a, 14b: support

15: standard machine 16: ELM guide 16: ball screw

18: cable bare 20, 20a, 20b, 20c: oil flow sensor

21 repeater 22 signal converter 24 motor

25 motor drive unit 23 encoder 30 control computer

40: parent computer

The present invention relates to a technique for continuously measuring the amount of oil applied on the steel plate in the running direction in the width direction and the running direction of the steel plate, and more specifically, always stable against changes in the surrounding environment and over time in measuring the oil amount of the steel plate. The present invention relates to a method of measuring the oil content of a steel sheet to enable accurate measurement.

In general, methods and apparatuses for measuring the oil content of steel sheets so far known include a primitive method of visually determining an excess or shortage of oil content and a method of determining the oil content of an oil content by a portable oil meter at a running end of the steel sheet. It was generalized.

These conventional methods are methods for judging the whole with only a small amount of measurement data, and cannot be said to be a method of spatially and accurately managing the excess and deficiency of the oil quantity with respect to the coil electric field.

In addition, in the case of using a portable flowmeter, a method of measuring the portable flowmeter by bringing it into close proximity to or close to the steel plate is mainly used. However, this method is used in order to prevent it from being affected by ambient lighting (commonly called disturbance light). Since the distance must be kept constant, and there is no response speed that can correspond to the steel plate running at high speed, and it is affected by the vibration of the steel plate, it is impossible to measure the steel plate while it is running. There is a limit.

In recent years, automatic measuring devices have been developed, such as infrared absorption method and ultraviolet irradiation method.

First, in the case of the infrared absorption method, the oil on the steel sheet absorbs infrared rays of some wavelengths in the infrared rays, and irradiates a certain amount of infrared rays from the outside to produce infrared rays of a specific wavelength in the reflected light and other wavelengths not absorbed by the oil. The amount of oil applied to the steel sheet is calculated by comparing the amount of infrared rays. This infrared absorption method is a method used for the measurement of coating amount other than a gas analyzer and oil.

For example, when the amount of infrared rays irradiated to the steel sheet is A0 and the amount of infrared rays of a specific wavelength reflected from the steel sheet is A1, the relationship of the following equation (1) is obtained.

A1 = A0EXP (-μt)

Where μ is the specific absorption rate of the oil, t is the thickness of the oil layer applied to the steel sheet. Since A0 and μ are already known values, it is possible to determine the thickness t of the oil layer by measuring A1, and in practice, R = A1 / A0.

However, such an infrared absorption method can be used as it is for the measurement of high concentration oil content of 500 [mg / m ² ] or more.

First, because very small amount of absorption occurs at low concentration of oil, the amount of reflected light hardly changes with respect to irradiated infrared rays, and R is close to 1, so accurate measurement is impossible. In this case, the ratio R does not change even if the amount of infrared rays A0 irradiated to increase the amount of infrared rays reflected by a specific wavelength is large, and thus there is a first limitation of the infrared absorption method.

In addition, another drawback of the infrared absorption method is that the infrared wavelength to be irradiated is set to 2 to 5 [μm]. Since the specific wavelength absorbed according to the oil species is in the range of 3 to 4 [μm], the wavelength must be included in these wavelengths. Infrared rays in this wavelength range are used in the surrounding objects from the room temperature to the temperature range near 80 [℃]. It is generated and input to the measuring device, and the infrared light and the irradiated infrared light of the surroundings are not emitted light like a laser light, but are naturally emitted light. Therefore, it is impossible for the infrared detection device to distinguish them. In other words, if the ambient temperature change is large, the measurement error occurs even if the temperature change is minimized by the measuring device itself.

In summary, the infrared absorption method has an inherent problem that it is difficult to measure accurately at low concentrations of oil, and the measurement error increases when the ambient temperature change is large.

Next, the ultraviolet absorption method is introduced to compensate for the shortcomings of the infrared absorption method, which is a method of irradiating ultraviolet rays from the outside and detecting visible light. This ultraviolet absorption method is similar to the infrared absorption method in that the ultraviolet rays are irradiated from the outside, except that the visible rays are detected, and the amount of visible rays detected is proportional to the amount of oil on the steel sheet.

FIG. 1 is a schematic configuration diagram of a conventional oil absorption measurement apparatus using an ultraviolet absorption method. For example, as shown in FIG. 1, in the ultraviolet light emitting diodes 1a and 1b of the sensor head 1 by pulse oscillation, FIG. Ultraviolet rays are emitted and detected by the light receiving lens 1c and then input to the transducer 2 through the ultraviolet filter 1d and the amplifier 1e, and at this time, the ultraviolet light emitting diodes 1a, When the amount of ultraviolet rays emitted from 1b) is U0 and the amount of visible light detected by the light receiving lens 1c is U1 and the thickness of the oil layer 4 coated on the steel sheet 3 is t, the relationship of Equation 2 below is obtained. Hold.

U1 = U0 × η × t

Here, η is fluorescence generating efficiency indicating the generation rate of visible light generated from the oil according to the irradiation of ultraviolet rays, that is, fluorescence.

Also in this ultraviolet absorption method, the amount U1 of visible light returning to the detection apparatus at the low concentration oiling amount is very small. In the infrared absorption method described above, even if the irradiated infrared ray A0 is increased, the ratio R is calculated. As a result, the detection sensitivity cannot be increased. However, in the ultraviolet absorption method, only the visible light is irrespective of the amount of ultraviolet rays. The point of detection is a big difference. That is, as the amount of ultraviolet rays U0 to be irradiated is gradually increased, the amount of visible rays U1 returned to the detection apparatus is increased. In this ultraviolet absorption method, since only the visible light amount U1 is detected, a large signal can be obtained even when t is small. For this characteristic, the ultraviolet absorption method is used.

However, the ultraviolet absorption method has the following problems.

One is that ultraviolet rays tend to be absorbed by the material, so if the window where ultraviolet rays are projected inside the detection device and the transmission window where the visible light generated from the oil on the surface of the steel sheet are incident to the detection device are contaminated, UV light is absorbed. In particular, contamination of the window through which ultraviolet rays are transmitted causes a large measurement error. Since the pollution of the window progresses slowly, it becomes a factor of change over time.

On the other hand, when the amount of ultraviolet light that is irradiated changes, only a visible light amount is detected, which may cause measurement errors. In the case of the infrared absorption method, the ratio of reflected light and irradiated light is detected. In this regard, the infrared absorption method does not have a problem of the change of the irradiation light to a certain extent. However, these only change the output in time. In fact, studies conducted by the present inventors confirmed that the general ultraviolet light source generates a maximum amount of light of 0.1 to 0.2% in one hour.

On the other hand, in general, the current value flowing through the high-pressure mercury lamp and the light emitting diode is controlled to be constant.

However, the luminous efficiency of these high-pressure mercury lamps and light-emitting diodes changes over time due to deterioration, so it is very difficult to accurately, precisely and consistently generate the amount of ultraviolet light generated even by controlling some of the electrical input current and voltage. Second task.

Furthermore, when such high-pressure mercury lamps and light-emitting diodes are installed in actual production facilities, changes in the characteristics of electronic circuits due to ambient disturbance light, changes in temperature near the installation site, trace oils floating in humidity and air, especially in the ambient atmosphere The detection signal is changed by a small amount of contaminants deposited on the surface of the mist and the detection device window. Air purge is carried out for the contamination of such a detector window, but it cannot be completely prevented. Therefore, how to stabilize the temporally changing characteristic is the second problem.

The present invention is to solve the problems of the conventional oil content measuring technology as described above, the object of the present invention is to enable the continuous measurement in the width direction and the running direction of the steel sheet applied oil amount In addition, by providing the measurement reference values that flexibly respond to changes in the surrounding environment and changes over time, as well as to measure the oiling or non-oiling of the steel plate in operation, it is always stable against the change of the surrounding environment and the change over time in the oil amount measurement of the steel sheet. The present invention provides a method for measuring the oil content of a steel sheet to enable accurate and accurate measurement.

A characteristic of the present invention for achieving the above object is the oiling made by the oil content measuring device of the steel sheet for measuring the oil content by irradiating ultraviolet or infrared rays and detecting the amount of light through the oil content measuring sensor movable in the width direction of the steel sheet A method of measuring a quantity, the method comprising: (a) a first step of scanning-mounting a standard group for providing a reference value necessary for material correction of the traveling steel sheet and correction of illuminance of ultraviolet rays or infrared rays by the oil induction measuring sensor; (b) a second step of detecting whether the oil-plated steel sheet normally enters the traveling line while the oil-oil measuring sensor is placed at a designated position; (c) a third step of setting detailed information of the steel sheet for measuring the oil content of the steel sheet entering the traveling line; (d) A steel sheet oil content measuring method comprising a fourth step of checking and storing the oil quantity in the longitudinal direction and the width direction of the traveling steel sheet in a state where normal operation is performed by checking the line speed of the traveling steel sheet.

In the method of measuring steel plate oil content according to the present invention, (c) the third step, (c1) after the detailed information of the traveling steel plate is set up, scanning the standard machine with the oil content measuring sensor to perform oiling of the steel plate It may be configured to further comprise the step of setting the calibration curve for the amount measurement, wherein the step (c1), taking the part of the ultraviolet or infrared light amount irradiated to the traveling steel sheet to scan the standard, and The method may include detecting visible light converted through a fluorescent material, and controlling an amount of ultraviolet light or infrared light irradiated to the traveling steel sheet by setting a calibration curve based on the size of the detected visible light.

In the method of measuring steel sheet oil flow rate according to the present invention, (c) the third step may include: (c2) after the detailed information of the traveling steel sheet is set up, check whether the designated time has elapsed and periodically check Scanning the standard by a measuring sensor may be configured to further include setting a calibration curve for measuring the oil content of the traveling steel sheet, wherein step (c2), checking whether the specified time has elapsed ; Taking a part of the amount of ultraviolet or infrared light irradiated onto the traveling steel sheet each time the specified time elapses, scanning the standard machine, and detecting visible light converted through the fluorescent material of the standard machine; The calibration curve may be set based on the size of the detected visible light to control the amount of ultraviolet or infrared light emitted to the traveling steel sheet.

In the method of measuring the steel plate induction amount according to the present invention, it may be preferable that the fourth step (d) is performed by dividing the entire length of the traveling steel plate into predetermined equal parts and repeating each divided zone.

The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration of the steel sheet induction measurement device according to the present invention and a preferred embodiment of the method and the resulting effects thereof.

FIG. 2 is a perspective view illustrating a steel plate oil inflow rate measuring apparatus according to the present invention, in which a preferred embodiment of the apparatus for measuring the front oil amount of the traveling steel sheet is illustrated. The case where it is installed so that a movement in the width direction of () is illustrated is illustrated.

As shown in Figure 2, the steel plate oil flow rate measuring apparatus according to an embodiment of the present invention is installed at the rear end of the oil injector 11 for applying oil to the steel plate 3 continuously and the ultraviolet light or the surface of the steel sheet At least one oil flow rate measuring sensor 20 for measuring the oil amount of the steel sheet by irradiating infrared rays and detecting the amount of light reflected from the steel sheet, and a sensor movement for moving the oil rate measuring sensor 20 in the width direction of the traveling steel sheet. Means for controlling the movement in the width direction of the oil inflow rate measuring sensor by controlling the sensor moving means, controlling the amount of ultraviolet rays or infrared rays irradiated from the oil inflow rate measuring sensor 20, and detected by the oil inflow rate measuring sensor. The control computer 30 collects the light quantity and calculates and stores the oil amount of the steel sheet, and is installed within the moving range of the oil amount measurement sensor 20 and sets a reference value for setting the calibration curve of the sensor. The configuration including the standard device 15 containing external or reference materials provided by the infrared radiation amount reference value and the light detection amount reference value.

In addition, according to the control signal transmitted from the control computer 30, by adjusting the amount of ultraviolet light or infrared light irradiated from the oil inflow rate measuring sensor 20 and controlling the signal amount converted by the amount of light detected by the oil inflow rate measuring sensor 20 A repeater 21 and a signal converter 22 for transmitting to the computer 30 are included.

Here, the sensor moving means, the support (14a, 14b) which are respectively installed on both sides of the traveling steel plate (3), both ends are fixed to the upper portion of the two support and the oil inflow measuring sensor is moved in the width direction of the steel plate LM guide 17 and ball screw 16 for guiding and supporting the head portion of the sensor to be possible, a cable bare 18 having a cable for electrically connecting the repeater and the oil flow rate measuring sensor, and the ball screw 16 Motor 24 and its driver 25 coupled to each other to provide rotational force, and the number of revolutions of the ball screw 16 for calculating the movement distance of the oil flow rate measuring sensor. It comprises the encoder 23 provided in.

The control computer 30 is connected to an upper computer 40 which executes a command set by an administrator. The control computer 30 is configured to perform a widthwise movement of the oil flow rate measuring sensor 20 according to a command indicated by the upper computer. The control unit is movably controlled to a position of) and detects the amount of light reflected from the standard unit 15 to reset the reference values for the light irradiation amount and the light detection amount reference value irradiated from the oil intake measurement sensor for measuring the oil inflow rate.

The standard group 15 includes a metal plate made of any one of aluminum and copper having a uniform surface state, and a plastic film made of any one of teflon and acryl, which emits fluorescence, is attached to the metal plate, and glass is placed on the plastic film. Alternatively, the non-fluorescent acrylic plate is attached, and the standard group is configured by shielding the surroundings so that air and moisture do not enter. This standard 15 is preferably installed in the width movement maximum distance of the oil flow rate measuring sensor 20, which is inside of one side support, as shown in FIG. The sensor is controlled to repeat the movement in the width direction within the maximum width of the traveling steel plate, and when the calibration curve is set using the standard, the oil flow rate measuring sensor 20 reaches the maximum movement distance in the width direction (that is, the support position on which the standard is installed). By moving it to reset the calibration curve reference value using the standard.

If it is desired to measure the non-oiling of the traveling steel sheet, in the configuration of FIG. 2, an additional oil flow rate measuring sensor is installed on the rear surface of the traveling steel sheet (not illustrated) and electrically connected to the repeater and the signal converter. This will be possible by forming separate channels that can be connected.

Further, the oil flow rate measuring sensor 20 may be provided in plural number side by side in the width direction of the steel sheet, preferably three (see Fig. 3b) may be arranged. In this case, one oil level measurement sensor in the center is fixedly disposed on the upper portion of the center of the steel plate, and two oil level measurement sensors on both sides are installed to be moved by a predetermined section along the width direction for measuring the oil amount in the width direction of the traveling steel plate. It would be desirable to be.

3A is an exemplary view illustrating a scan operation that may be performed by the oil flow rate measuring apparatus of FIG. 2. FIG. 3A illustrates an operation of performing longitudinal and widthwise scans of a steel plate with one sensor, and FIG. 3B shows three oil flow rates. When the measurement sensor is installed, it illustrates a scan operation that can be performed by one sensor 20a fixedly disposed at the center and two sensors 20b and 20c disposed at both sides thereof. Here, a plurality of the oil intake measurement sensors 20a, 20b, and 20c are arranged side by side in the width direction of the steel plate, and one oil intake measurement sensor 20a fixedly disposed at the center of the steel plate is used to measure the oil in the longitudinal direction of the steel plate. Two oil flow rate measuring sensors 20b and 20c which are used for the purpose of measuring and disposed on both sides illustrate the state used for the purpose of measuring the oil amount in the width direction.

4 is an overall flow chart of the method for measuring steel plate oil flow rate according to the present invention. In the oil flow rate measuring device illustrated in FIGS. 40) is connected, and when the length of the coil is 1500 m in a state in which the standard of the material of the traveling steel plate and the standard for providing illuminance correction of ultraviolet or infrared rays is installed to be scanned by the oil induction measuring sensor. An embodiment of a method for measuring oil flow rate is disclosed.

The oil-injection measuring method according to the present invention includes a first step (not shown in the drawing) of installing a standard to be scanned by the oil-injection measuring sensor and a second step of detecting whether the oil-plated steel sheet normally enters the traveling line. (S101, S103), the third step (S105, S107) of setting up the detailed information of the steel plate to determine whether it is normal, and the fourth step (S109-) of measuring and storing the oil content in the longitudinal direction and the width direction of the traveling steel plate (S109-). S123).

The first step is a step of installing a standard to provide a reference value necessary for the material of the traveling steel sheet and the roughness correction of ultraviolet rays or infrared rays, as shown in FIG.

In the second step, the step of waiting for the oil-injection measuring sensor at an initial designated position (S01), and checking whether there is an interrupt command indicating that the oil-free steel sheet is received from the host computer in the standby state, It is determined whether or not to enter normally (S103). In this step, when the oil-plated steel sheet enters the driving line normally, the steel sheet information is transmitted online from the host computer, so that the information can be received and set up. On the contrary, if an interrupt instruction indicating that the oil-free steel sheet is entered is detected (S103 of &Quot; Y " branch) The control computer controls the sensor moving means to move the oil flow rate measuring sensor to an arbitrary position previously designated for non-oil measurement (S131), and repeats the oil flow measurement by the designated number of times at that position After the execution (S133 and S135), the result is returned to the step of storing the result (S137) and waiting at the initial designated position again. At this time, the steel sheet information online from the host computer may be a coil number, the oiling code indicating the degree of oiling and whether or not the steel sheet, the width and thickness of the steel sheet, coil length, material information, roughness information, and the like.

The third step is a step (S105) of receiving and setting up detailed information of the steel sheet for measuring the oil flow rate of the steel sheet entering the traveling line (S105) and determining whether the steel sheet information is normal (S107). ).

In step (c), in step (c1), after the detailed information of the traveling steel sheet is normally set up, a calibration curve for measuring the oil content of the traveling steel sheet on which detailed information is set by scanning the standard with the oiling flow measuring sensor is set up. It may be configured to further comprise a step (S109), wherein the step (c1), taking a portion of the ultraviolet light amount irradiated to the traveling steel sheet to scan the standard, and converts through the fluorescent material of the standard Detecting the visible light, and setting a calibration curve based on the detected size of the visible light, and controlling the amount of ultraviolet light emitted to the traveling steel sheet.

In addition, (c) the third step, (c2) further comprises the step of checking whether the specified time has elapsed after the detailed information of the traveling steel sheet is normally set up, by the oil intake measurement sensor periodically at a specified time The standard machine may be programmed to perform the step of setting a calibration curve for measuring the oil content of the traveling steel sheet.

The fourth step is to check the line speed of the traveling steel sheet running by the analog input from the host computer after the preparation of the sensor measurement, the set speed (for example 50mpm) to distinguish whether the line speed is normal operation or trial operation operation In case of abnormality, it is determined that the operation is normal. If the abnormality is detected (S111), and if the detection result is normal operation ("Y" branch of S111), the length preset in the longitudinal direction of the traveling steel sheet (for example, For example, a length sufficient to determine whether uniform oiling is made in the longitudinal direction of the steel sheet may be sufficient. In the present invention, the case of a coil having a full length of 1500 m is taken as an example. Step (S113, S115, S123-S125) to measure and store the oil quantity until reaching the &quot; And comprises a step (S117, S119, S123-S125) of storing as many times as to measure the amount of ointment. These stored values allow for trends in future measurement results and allow for processing and storage of unit coil performance.

Wherein (d) the fourth step, the total length of the traveling steel sheet with the detailed information is set into a predetermined equal part, that is, by dividing the coil into three parts, and may be repeatedly performed for each divided area. To be programmed.

In particular, in the embodiment illustrated in FIG. 3B, the longitudinal oil spreading amount and the width oil spreading amount of the steel sheet can be simultaneously measured in the fourth step, and of course, such an operation may of course be repeatedly performed in the equally divided sections. Could be.

The overall operation of the apparatus and method for measuring the steel sheet induction rate according to the present invention configured as described above will be described taking an example where one sensor is installed.

First, in the first step, the support 14a, 14b to scan the standard (15) for providing a reference value necessary for the illumination correction of the ultraviolet or infrared light output from the material of the traveling steel sheet and the sensor by the oil intake measurement sensor (20) We install on one side of).

Next, in the second step, the oil flow rate measuring sensor 20 is waited at the designated initial position (S101), and in the waiting state, the control computer 30 receives an interrupt instruction indicating that it is an unoiled steel sheet from the host computer 40. Check (S103) to confirm that the oil-coated steel sheet normally enters the traveling line ("N" branch in S103). At this stage, when the oiled steel sheet enters the driving line normally, the steel sheet information, namely the coil number, oiling degree and the presence / absence of the steel sheet, can be found online from the host computer, the width and thickness of the steel sheet, the coil length, the material information. Since the illuminance information is transmitted, the control computer 30 can receive the information. On the contrary, if an interrupt instruction indicating that the non-oiled steel sheet is entered ("Y" branch of S103), the control computer moves the sensor. By controlling the means, the oil flow rate measuring sensor is moved to a predetermined position for oiling / non-oiling (S131), and the oiling / non-oiling is repeated for the designated number of times at the corresponding position (S133, S135). After that, the result is stored (S137) and the process returns to the step of waiting at the initial designated position again.

Next, in the third step, the detailed information of the steel sheet for measuring the oil inflow rate of the steel sheet entering the traveling line is received and set up (S105), and it is determined whether the steel sheet information is normal (S107). At this time, if the material correction or illuminance correction is necessary due to environmental changes and changes over time of the device, the administrator can instruct a control command to the control computer 30 through the host computer 40. After the detailed information of the traveling steel sheet is normally set up, the control computer 30 controls the movement in the width direction of the oil inflow measurement sensor 20 to move up to the maximum movement width, and scans the standard 15 for detailed information. It is possible to set the calibration curve for measuring the oil flow rate of the traveling steel sheet is set (S109). The standard machine scan operation scans the standard machine by taking a part of the amount of ultraviolet light irradiated onto the traveling steel sheet, detects the visible light converted through the fluorescent material of the standard machine, and sets a calibration curve based on the size of the detected visible light. Thus, the amount of ultraviolet light irradiated to the traveling steel sheet can be controlled.

In addition, such a standard scan operation may be checked periodically (not shown) for a specified time elapsed and periodically executed at the designated time.

Finally, in the fourth step, it is checked whether the line speed of the traveling steel sheet set by the analog input from the host computer is equal to or higher than the set speed after completion of the measurement preparation as described above (S111). Here, the set speed is a value for distinguishing whether it is normal operation or trial operation operation. For example, when the traveling speed is 50mpm or more, it is determined that it is normal operation, and the oil level measurement operation of the fourth step is executed. It is judged that the oil flow rate measuring operation is not executed.

That is, as a result of the determination, if the normal operation is performed ("Y" branch of S111), the longitudinal oil flow continuously measured in the 300 m section in the longitudinal direction of the traveling steel sheet (S113, S115), the width direction of the traveling steel sheet In the remaining 200m section, the number of times (where the number n may vary depending on the divided length) is repeatedly measured in the width direction oil (S117, S119). These measured values are stored in a separate storage medium (123-S125) through a control computer or a higher level computer.These stored values enable you to display trends of future measurement results and to process and store unit coil performance. do.

The fourth step may be performed by dividing the entire length of the traveling steel plate into three parts and dividing the entire length of the traveling steel plate into a tip part, an intermediate part, and a terminal part and repeating each divided area. For example, if the total length of the coil is 1500m, the tip, middle and end portions are divided equally into 500m each, and in each 500m section of the divided length, the longitudinal measurement is performed in the first 300m section and the width direction in the remaining 200m section. By repeatedly measuring the oil content of the whole steel sheet, it becomes possible to measure more precisely and accurately.

According to the oil content measuring apparatus and method of the steel sheet according to the present invention configured as described above, a scanning device for scanning the upper portion of the traveling steel sheet, that is, the oil content measuring apparatus according to the present invention is larger than the maximum width of the steel sheet. By providing a function to enable scanning in the width direction, by installing a standard that includes a standard material that does not deteriorate and is not affected by the surrounding environment such as temperature and humidity causing changes over time at the edge of the traveling steel sheet, For scanning in the width direction from the top, measuring the width and plate direction oil flow rate, and when the standard value needs to be calibrated after a certain period of time, the range of the width direction scan is extended and installed on the edge of the scanning device. By moving the oil flow sensor above the standard, the amount of fluorescence generated from the standard can be used as the reference It is possible to calibrate the reference value of the oil flow sensor while it is installed in the production line.

Specifically, the present invention has the advantage of providing a specific means to maintain a constant amount of light on the traveling steel sheet while detecting the deterioration attenuation and change of the ultraviolet light source, and the width of the steel sheet to the amount of oil applied on the traveling steel sheet By making it possible to continuously measure in the direction and running direction, there is an advantage that it is possible to always measure stable and accurate against the change of the surrounding environment and the change over time in measuring the oil amount of the steel sheet.

In addition, the calibration of the measuring device by removing the device from the production line up to now has the advantage that can be calibrated in the actual production line installed state.

Claims (6)

In the oil content measuring method made by the oil content measuring device of the steel sheet for measuring the oil content by irradiating ultraviolet or infrared rays and detecting the amount of light through the oil content measuring sensor which is movable in the width direction of the steel sheet, (a) a first step of installing a standard for providing a reference value for correcting roughness of ultraviolet ray or infrared ray and a material of a traveling steel sheet by a scanning oil sensor; (b) a second step of detecting whether the oil-plated steel sheet normally enters the traveling line while the oil-oil measuring sensor is placed at a designated position; (c) a third step of setting detailed information of the steel sheet for measuring the oil content of the steel sheet entering the traveling line; and (d) measuring a line speed of the traveling steel sheet and measuring the oil quantity in the longitudinal direction and the width direction of the traveling steel sheet in a state where normal operation is performed. Way. The method of claim 1, wherein (c) the third step, (c1) after the detailed information of the traveling steel sheet is set up, scanning the standard with the oiling flow rate measuring sensor and setting a calibration curve for measuring the oil content of the traveling steel sheet further comprising: How to measure. The method of claim 2, wherein step (c1) comprises: Taking a portion of the ultraviolet or infrared light emitted to the traveling steel sheet to scan the standard, and detecting visible light converted through the fluorescent material of the standard; And setting a calibration curve based on the size of the detected visible light and controlling the amount of ultraviolet light or infrared light irradiated to the traveling steel plate. The method of claim 1, wherein (c) the third step, (c2) After the detailed information of the traveling steel sheet is set up, it checks whether a specified time has elapsed and periodically sets the calibration curve for measuring the oil quantity of the traveling steel sheet by periodically scanning the standard by the oiling flow rate measuring sensor every designated time. Steel sheet oiling flow measuring method further comprising the step of. The method of claim 4, wherein step (c2), Checking whether a specified time has elapsed; Taking a part of the amount of ultraviolet or infrared light irradiated onto the traveling steel sheet each time the specified time elapses, scanning the standard machine, and detecting visible light converted through the fluorescent material of the standard machine; A method of measuring steel induction amount, characterized in that the calibration curve is set based on the size of the detected visible light, and the amount of ultraviolet or infrared light irradiated to the traveling steel sheet is controlled. The method of claim 1, wherein (d) the fourth step, Steel plate oil flow measurement method characterized in that the entire length of the traveling steel sheet is divided equally into a plurality of sections and repeated for each divided zone.

Images