JP3050581B2 - Detecting method of attached slip sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention is suitable for use in detecting unrecovered slip sheet adhering to a metal strip on the entrance side of a manufacturing facility for a metal strip such as a cold rolled stainless steel sheet using a slip sheet. The present invention relates to a slip sheet detection method.

[Prior art]

When winding a metal strip such as a stainless steel plate, insert a slip sheet (made of kraft paper, neutral paper, etc.) between the metal strips to prevent scuffing caused by misalignment between the metal strips. Is commonly done. Since the slip sheet is unnecessary in the next process, it is collected when the metal strip is passed on the next process entry side. At this time, the slip sheet may be collected normally, but it is broken or two sheets are inserted (the slip sheet is insufficient during the winding of the metal strip in the previous process, and the slip sheet is supplied from another slip sheet supply device. When the slip sheet is inserted twice, there is a possibility that a part of the slip sheet may adhere to the metal strip without being recovered and enter the processing equipment. If the slip-sheet enters the processing equipment while adhering to the metal strip, the slip-sheet may burn, for example, around a welder, or wrap around a roll, etc., resulting in product quality defects in the metal strip. There is. Therefore, it is necessary to find and remove the uncollected interleaf paper before adhering to the metal strip and entering the processing equipment. Conventionally, such adhered slip sheets have generally been monitored by a person, but from the viewpoint of improving work efficiency and improving the work environment, it is required to detect the slip sheets with a detection device. For this reason, as a technology for detecting an attached slip sheet, Japanese Utility Model Application
In -55187, an electric resistance roll method is proposed.

[Problems to be solved by the invention]

However, in the prior art described in the above-mentioned publication, undetection or over-detection of the slip sheet may occur due to run-out of a metal strip, for example, a steel sheet, a change in slip sheet quality, or penetration of rolling oil. There was a problem of lack of sex. Further, since the above-mentioned conventional technique is a technique for detecting paper while the roll is in contact with the strip, the strip may be damaged. The present invention has been made in view of the above-mentioned conventional problems, and has an object to provide a method for detecting a slip sheet that can stably detect a slip sheet that is not in contact with a metal strip. I do.

[Means to solve the problem]

The present invention provides a method for detecting a sheet attached to a metal strip when the metal strip is conveyed to a processing line, wherein the color of the metal strip is optically changed at each strip end at each strip end. The present invention solves the above-mentioned problem by detecting the slip sheet based on a color difference between the detected color during the running of the metal strip and the reference color. Further, each color component signal is sampled several tens of times, and the average value of each color of the sampled color signal is read as a representative value of the reference color. In addition, reference color data is stored in advance for each metal strip, and the slip sheet is detected based on a color difference between a detected color while the metal strip is running and the reference color.

[Action]

The present invention provides various tests and studies in order to find a technology that can detect a slip sheet adhered to a metal strip without undetected or overdetected with high reliability and that can be detected in a non-contact manner. Was done. As a result, there is a large color difference between the metal strip such as a steel plate with metallic luster and the slip sheet, and this color difference means that there is a clear color difference between the metal strip and the slip sheet. I found that. Therefore, the inventor has focused on this color difference and conceived that it is best to detect the color of the metal strip and to detect the color difference from the reference color in order to detect the slip sheet. Further, by optically detecting in this manner, the detection device can be brought into non-contact with the metal band plate, and the adhesion of the slip sheet can be detected stably without damaging the metal band plate product. The present invention has been made based on the above findings. Advantageous Effects of Invention According to the present invention, it is possible to prevent undetected or overdetected without contacting a metal band plate when detecting an attached slip sheet, and to detect highly reliable and stable attached slip sheet. . Therefore, there is no trouble on the product which may occur when the slip sheet adheres to the metal strip in the metal strip processing line. In addition, there is no need for a person to monitor the adhesion state of the slip sheet. Further, since the interleaved paper can be detected without contacting the metal strip, the metal strip is not damaged. In addition, according to a survey by the inventor, it was confirmed that a detection rate of more than 90% was obtained because the color difference was focused on when the slip sheet attached to the metal strip was detected by the apparatus of the present invention. did it. At this time, since the reference color of the present invention is a color detected at the end of the band plate for each band plate, a color difference can be detected according to a detection condition different for each band plate, and the detection accuracy of the attached slip sheet can be improved. Could be improved.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. This embodiment is an apparatus for detecting a slip sheet adhered to a steel sheet 1 having a configuration as shown in FIG. As shown in FIG. 1, the detection device mainly includes a sensor head unit 2 and a control unit 3. The sensor head unit 2 detects a color signal of the steel plate 1, and emits a reference light for irradiating the steel plate 1. And a spectroscope 5 for receiving light reflected from the light source and decomposing the light into red (R), green (G), and blue (B) color components. In the figure, reference numeral 5A
Is a light receiving lens, and 5R, 5G, and 5B are amplifiers for amplifying the R, G, and B color component signals. The light source 4 is a steel plate 1
The reference light can be emitted at an angle of, for example, 45 degrees with respect to the normal direction, and the light receiving lens 5A can receive the reflected light from, for example, the normal direction of the steel plate 1. The control unit 3 calculates the color difference from the detected color signal and detects the presence of the attached slip sheet. The interface unit 6 receives the R, G, and B color component signals output from the sensor head unit 2. An A / D converter 7 for converting the received signal, which is an analog signal, from analog to digital (A / D) and digitizing the signal; and converting the digitized R, G, and B component signals to a steel plate. (In the embodiment, the color at the tip of each steel sheet is used as a reference color for each steel sheet to calculate the color difference between the reference color and the detected color)
, A determining unit 9 for determining whether or not the slip sheet is attached to the steel sheet based on the calculated color difference, and an R, G, B color component signal of the steel sheet 1 and the like. A memory 10 for storing, and an output unit 11 for outputting a detection signal indicating that a slip sheet is attached to a slip sheet removing device 16 to be described later
And a display unit 12 for indicating that a slip sheet is attached.
And a keyboard 13 for inputting calculation conditions, detection start commands, and the like. In FIG. 1, reference numeral 14 denotes the attached slip sheet detection device, and reference numeral 15 denotes the slip sheet. Hereinafter, the operation of the embodiment will be described. First, when the steel plate 1 is being conveyed in the direction of the arrow in the figure, reference light from the illumination light source 4 is referred to the steel plate 1. The light reflected from the steel plate 1 is separated into R, G, and B color components by a spectroscope, and the component signals are input to the control unit 3. The control unit 3 digitizes the component signal by the A / D converter 7 through the interface unit 6,
To enter. The calculation unit 8 detects a color difference from the input digital color component signals by calculation, and detects a change in the detected color difference from the steel plate 1.
It is determined whether or not the upper slip sheet 15 is attached. In the embodiment, since the surface state of the steel sheet 1 is different for each coil of the steel sheet 1, first, at the tip of the steel sheet 1,
The color of the steel sheet 1 is read and teaching is performed. Thereby, the color difference can be accurately detected for each steel plate 1. In addition, at the time of reading, since the shape of the steel plate 1 and the fluctuation of the pass line and the like function as disturbances, the same type of steel plate 1 causes a difference in color difference. Therefore, in order to correct the difference in color difference due to the disturbance, each color component signal is sampled several tens times while the steel plate 1 is running, and the average value of each color of the sampled color signal is read as a representative value of the reference color. .
As a result, the reference colors can be read without being affected by disturbance, and the color difference detection accuracy can be improved. Therefore, when the slip sheet 15 adheres to the steel sheet 1, the color difference changes, for example, by 10 or more, and therefore, it is possible to accurately detect that the slip sheet 14 adheres to the steel sheet 1. FIG. 2 shows an example in which the apparatus of the embodiment is applied to a steel sheet processing line. The steel sheet processing line shown in FIG. 2 has a process section 19 such as a heat treatment furnace for annealing, and a slip sheet removing device for removing the attached slip sheet 15 on the inlet side of the process section 19.
16 are provided. This slip-sheet removing device 16 is a roll peripheral surface for removing the slip-sheet 15 from the steel sheet 1 when the slip-sheet 15 is detected by the attached slip-sheet detecting device 14 according to the embodiment provided on the upstream side. A brush roll 17 having a brush fixed thereto and capable of rotating and moving up and down, and an air nozzle for removing the removed slip sheet out of the line by blowing gas such as air
With 18. In the drawing, reference numeral 20 denotes a rotation drive unit for rotating the brush roll 17 based on a slip sheet adhesion detection signal output from the adhesion slip sheet detection device 14, and 21 denotes a brush roll 17 based on the detection signal. Is a cylinder for moving up and down. In this steel sheet processing line, when the steel sheet is conveyed in the direction of the arrow in the figure, the attached slip sheet detection device 14 detects that the slip sheet 15 is attached to the steel sheet 1 on the upstream side.
The detection signal is input to a slip sheet removal signal 16 provided downstream. The slip-sheet removing signal 16 causes the rotary roller 20 and the cylinder 21 to rotate and lower the brush roll 17 based on the detection signal. Brush roll 17 sweeps over the steel plate,
Air is blown from the air nozzle 18 onto the steel sheet to remove the slip sheet 18 from the steel sheet 1. As described above, the removal of the slip sheet is completed before the process section 19 on the downstream side is entered, and the quality trouble in the process section 19 is prevented. In the above-described embodiment, a steel plate is exemplified as the metal band plate. However, the metal band plate capable of detecting the attached slip sheet according to the present invention is not limited to the steel plate, as long as the color can be optically detected. Thus, the slip sheet can be detected for any of the metal strips. In the above embodiment, the reference color is determined by sampling the color signal at the tip of each steel plate 1. However, the reference color used in practicing the present invention is not limited to this. In advance, the reference color data corresponding to the steel plate and the processing content can be read and used.

【The invention's effect】

As described above, according to the present invention, a slip sheet attached to a metal strip can be detected reliably and stably without contacting the metal strip. Therefore, the slip sheet can be accurately detected, and thereby the slip sheet can be removed before the metal strip processing, so that it is possible to prevent the occurrence of a trouble on a product that may occur due to the sticking of the slip sheet. . Further, since the detecting device does not contact the metal strip, no scratch is generated. Also, since there is no need for a person to monitor the state of adhesion of the slip sheet, excellent effects such as a marked improvement in work efficiency can be obtained. According to the investigation by the inventor, an excellent effect that a detection rate exceeding 90% can be obtained when the slip sheet is detected according to the present invention was obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram including a partial cross-sectional view showing a configuration of an attached slip sheet detection device according to an embodiment of the present invention, and FIG. 2 is a configuration of a slip sheet removal device to which the detection device is applied. It is sectional drawing including the block diagram shown. DESCRIPTION OF SYMBOLS 1 ... Steel plate, 2 ... Sensor head part, 3 ... Control part, 4 ... Illumination light source, 5 ... Spectroscope, 6 ... Interface, 7 ... A / D converter, 8 ... Calculation part , 9… Judgment unit, 10… Memory, 11… Output unit, 12… Display unit, 13… Keyboard, 14… Adhesive slippage detector, 15… Interleaf (adhesive slipsheet), 16 ... Slip-sheet removal device, 17 ... Brush roll, 18 ... Air nozzle, 19 ... Process section.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-81846 (JP, A) JP-A 62-55187 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01V 8/10

Claims (3)

(57) [Claims] 1. A method for detecting a sheet attached to a metal strip when the metal strip is conveyed to a processing line, wherein the color of the metal strip is optically determined at the tip of the strip for each strip. A method for detecting an attached slip sheet, wherein the detected slip sheet is detected based on a color difference between a detected color while the metal strip is running and the reference color. 2. The method according to claim 1, wherein each color component signal is sampled several tens of times, and an average value for each color of the sampled color signal is read as a representative value of a reference color.
The method for detecting an attached slip sheet according to claim 1. 3. The method according to claim 1, wherein data of a reference color is stored in advance for each metal strip, and the slip sheet is detected based on a color difference between a detected color while the metal strip is running and the reference color. The method for detecting an attached slip sheet according to claim 1.