KR100352589B1 - An apparatus for detecting a defect in a strip - Google Patents

Abstract

PURPOSE: An apparatus for detecting defects on strip is provided which is installed on a line after rolling or oil coating to detect size and position of defects accurately by sensing vibration due to defects through a vibration sensor so that quality of products is improved. CONSTITUTION: The apparatus for detecting defects of a strip(1) comprises a defect detector comprising a roller(10) with which strip comes into contact, and sensors installed at left and right sides of the roller to sense vibration of the roller due to defects(3) of strip; and a display part comprising a warning lamp for indicating sensing of defects of strip, a display window(27) for displaying data inputted from the defect detector, and a volume switch(35) having magnitude of a specific frequency or more through the warning lamp by designating volume set per frequency band for vibration frequency inputted from the defect detector, wherein the display part is connected to the sensors to display data sensed.

Description

An apparatus for detecting a defect in a strip}

The present invention relates to a defect detection apparatus of a strip, and more particularly, to a roller type defect detection apparatus for detecting irregularities of a strip by detecting a defect caused by vibration of the strip by a sensor attached to a roller shaft contacting the strip. .

In general, hot rolled coils are temper-rolled to prevent straightening, slicing, and staggering, then trimmed to the desired width to apply oil and shear to prevent rust on the strip. Packed and supplied to the consumer. Since hot rolling or temper rolling is carried out by rollers having various characteristics, when foreign matter enters the roller, the foreign matter adheres to the roller and unevenness (dent) having a certain pitch is formed on the strip. This is a decisive factor of quality deterioration.

The conventional method for detecting the above-described defects was performed at the inspection table 2 as shown in FIG. That is, the defect 3 of the strip 1 was visually confirmed and investigated by the inspection stand 2 provided on the process line. However, there is a limit to the inspection method which is visually confirmed, and in particular, since the strip is located on a line moving continuously, the identification becomes more difficult.

In addition, in order to visually identify a defect on the line, the speed of the line must be lowered to 30mpm, which is much lower than 300 to 500mpm, and then the existence of the defect must be confirmed. There was a problem of deterioration. Moreover, even when the speed of the line is slowed down and the fault is detected by touch, there is a limit in the ability of the human person. Therefore, the detection is uncertain, and in the case of requiring extensive inspection, the inspection must be performed in pairs of two. Reinforcement is needed.

In the case of detecting the unevenness occurring after the inspection table process, since the oil for preventing rust is applied on the strip 1, it becomes impossible to visually check the oil after washing the oil or as shown in FIG. 2. When the oil-coated strip is transferred through the guide roller 5 by the oiler 7, the line must be stopped and then detected by touch. Therefore, even in the visual inspection method after applying the oil, there is a problem in that the manufacturing cost increases because a process for washing the oil must be added separately, and it is not preferable because the washed oil becomes an important cause of contaminating the environment. Purifying oil is also expensive. In the case of detecting a defect by touch, a problem occurs that the line stops, and the uneven defects generated during the rolling process appear continuously with a constant pitch, so that a wide range of inspections have to be performed. The cost increases as the number of people increases. In addition, since the oil-based contamination occurs on the coated gloves during the tactile test, it adversely affects the environment.

The present invention has been proposed to solve the above problems, it is installed on the line after rolling or oil coating to detect the vibration caused by the defect by the vibration sensor to improve the product quality by detecting the exact size and location of the defect It is an object of the present invention to provide an apparatus for detecting defects of strips that can be made.

It is another object of the present invention to provide a defect detecting apparatus for a strip, by which defects can be detected without interruption of a line or deceleration of speed, so that the process can be quick and manufacturing cost can be reduced.

Still another object of the present invention is to provide a defect detecting apparatus for a strip capable of displaying data such as the diameter of the rolling roller by the detected defect data.

In order to achieve the above object, the defect detection apparatus of the strip according to the present invention is a defect detector for contacting the strip to detect the defect of the strip, a detector fixing portion for fixing and moving the defect detector, the above-described defect detector It is connected to the display unit and displays the position, size and various data of the defect.

The defect detector includes a strip contact roller which rotates in contact with the strip, left and right vibration sensors mounted on both ends of the shaft of the strip contact roller to detect vibration caused by a defect of the strip, and mounted on the strip contact roller. It consists of a safety cover to promote safety.

The defect detector fixing part comprises a detector fixing angle for fixing the defect detector to the oiler, a detector conveying means mounted on an upper portion of the detector fixing angle to move the defect detector from side to side, and contacting and separating the defect detector from the strip. It consists of a detector contact means. The detector transfer means includes a first detector moving screw mounted on an upper part of the detector fixed angle, a handle for operating the first detector moving screw, and a first detector moving screw engaged with the first detector moving screw to operate the defect detector. It consists of a second detector moving screw for moving the to a desired position. In addition, the detector contact means is composed of an air cylinder connected to the second detector moving screw.

The display unit has a warning light indicating the occurrence of a defect by the detection of vibration, a data display window displaying data input from a defect detector such as a pitch of a defect on a strip, and a vibration frequency input from the defect detector for each frequency band. It consists of a volume control switch for designating a volume to display the size of a defect through a warning lamp, and a power source comprising a battery for supplying power to the display unit. The warning lamp is composed of a vibration detection warning light indicating the detection of vibration and the left and right vibration warning light indicating the position of a defect. In addition, the diameter of the rolling roller of the line can be known by calculating the pitch of the defect displayed on the data display window. Since the display portion is connected to the defect detector by a connecting jack and is supplied with power by a detachable battery, one display portion can be used for a plurality of lines.

1 is a view showing a defect detection apparatus of a conventional strip.

2 is a view showing a defect detection apparatus of another conventional strip.

3 (a) to 3 (c) are plan, front and side views, respectively, of a defect detector of a defect detection apparatus according to the present invention;

4 is a view showing a display portion of a defect detection apparatus according to the present invention.

5 is a view showing a detector fixing part of the defect detection apparatus according to the present invention.

6 is a view showing the operation of the defect detection apparatus of the strip according to the present invention.

Explanation of symbols on the main parts of the drawings

1: strip 3: defect

5: guide roller 7: oiler

10: strip contact roller 11: strip contact roller shaft

13: bearing base 15: support stand

17a, 17b: left and right vibration detection sensor 20: angle connection pipe

22: connection jack 27: data display window

29: Vibration detection warning light 30a, 30b: Left and right vibration warning light

35: volume control switch 40: detector fixed angle

41a: Moving screw of first detector 41b: Moving screw of second detector

43: handle 45: air cylinder

Hereinafter, a defect detection apparatus for a strip according to the present invention will be described in detail with reference to the accompanying drawings. Incidentally, the same components as in the prior art will be described with the same reference numerals.

3 (a) to 3 (c) are plan, front and side views, respectively, of a defect detector of a strip according to the present invention. As shown in the figure, the defect detector includes a strip contact roller 10 in which the strip is in contact with and rotates, a strip contact roller shaft 11 inserted into the strip contact roller 10, and the strip contact roller shaft ( 11 is inserted into the bearing 13, the support 15 for supporting the bearing 13, and the roller shaft 11 is attached to both ends of the vibration of the roller due to the defect of the strip (1) Safety cover for detecting the left vibration sensor (17a) and the right vibration sensor (17b) for detecting, and for supporting the user's safety when the strip 1 is in contact with the roller 10 is installed on the support (15) It consists of 19. An angle connecting pipe 20 is mounted on the support 15 to connect the defect detector to the display unit of FIG. 4 through the connection jack 22.

In the above configuration, the strip contact roller 10 rotates in contact with the strip 1. At this time, if there is an uneven defect in the strip, vibration occurs in the roller 10 as the contact between the strip 1 and the roller 10 progresses, and the vibration is left and right vibrations attached to both ends of the roller shaft 11. After being detected by the sensors 17a and 17b, the frequency of the vibration is amplified by the amplifier of the control box in the vibration sensors 17a and 17b to detect even the minute frequency, that is, the minute defect. This amplified frequency is filtered by a filter and distinguished by the magnitude of the vibration.

4 is a diagram illustrating a display unit displaying various types of data detected by the above-described defect detector. As shown in the figure, the display section is provided with a power switch 25 for turning the power on / off and a power lamp 26 indicating the on / off state. Vibration detection warning light 29, left vibration warning light 30a and right vibration warning light 30b are installed next to the power switch 25 so that when the strip 1 coming into contact with the strip contact roller 10 is defective, The detection warning lamp 29 notifies the presence of the defect and at the same time the position of the defect is notified by the left and right vibration warning lamps 30a and 30b.

The frequencies output from the left and right vibration sensing sensors 17a and 17b are classified by frequency band as shown in Table 1. At this time, the size of each frequency is proportional to the size of the defect of the strip. That is, as the size of the defect increases, the intensity of vibration of the strip contact roller 10 increases, and in proportion thereto, the size of the frequency input to the display unit also increases.

Volume sensor left side right One 0 to 5 Hz 0 to 5 Hz 2 5 to 10 Hz 5 to 10 Hz 3 10 to 15 Hz 10 to 15 Hz 4 15 to 20 Hz 15 to 20 Hz 5 20-25 Hz 20-25 Hz 6 25 to 30 Hz 25 to 30 Hz 7 30 to 35 Hz 30 to 35 Hz 8 35 Hz or more 35 Hz or more

The volume control switch 35 displays each of the above volumes. If a defect exists in the strip and the left and right vibration detection sensors 17a and 17b detect vibration, the vibration detection warning light 29 lights up and the left vibration warning light 30a or the right vibration warning light 30b lights up, and thus the position of the defect. Is displayed. When the vibration detection warning light 29 is continuously turned on in the lower volume of the volume control switch 35, the volume switch 35 is adjusted to an upper level to recognize the maximum vibration frequency input to determine the size of a defect. In addition, when there is a very small defect in the strip 1 which does not affect the use of the strip 1 described above, the vibration detection warning lamp 29 is continuously turned on at the lower volume, and the volume switch 35 is turned to the upper level. By adjusting, it is possible to ignore the minute defects described above. That is, when the volume of the volume control switch 35 is set, if a defect of a frequency smaller than the frequency corresponding to the set volume is detected, the vibration detection warning light 29 does not light and a defect of a frequency greater than the frequency is detected. Only when the vibration detection warning light 29 is turned on. Therefore, the size of the detected defect can be determined according to the set volume value, and a defect smaller than a frequency corresponding to the set volume value can not be detected and can be ignored.

The data display window 27 displays data such as a vibration period, that is, the pitch of the defect 3 and the like. In general, since the defects of the strip are caused by foreign matters mixed in the rolling process such as the temper rolling process and adhered to the rolling roller, the defects occur continuously with a constant pitch. Therefore, the pitch of a defect means the circumference of a rolling roller, and the diameter of a rolling roller can be calculated | required from this circumference.

Since the display portion is connected to the display portion by the connecting jack 22 and is supplied with power by the battery 31 as shown in FIG. 4, the display portion is movable and connected to the detection apparatus mounted on each line. By simply connecting 22, one display can be connected to a plurality of detectors for use. At this time, various data such as the diameter of the rolling roller on the line can be obtained based on the vibration period of the vibration frequency and the like displayed on the data display window 27.

The reset switch 32 is for resetting the data displayed on the data display window 27 to 0. The reset switch 32 is for removing new data from the previous line and displaying new data when the display unit is moved to another line. .

5 is a diagram illustrating a detector fixing unit for fixing a defect detector. As shown in the figure, the detector fixing angle 40 is mounted on the oiler 7, and the first detector moving screw 41a is mounted on the upper portion thereof, and the second detector moving screw 41b is mounted on the first detector. The second detector moving screw 41b moves to the left and right as the handle 43 installed at one end of the first detector moving screw 41a engages with the moving screw 41a. An air cylinder 45 is attached to the second detector moving screw 41b. The air cylinder 45 is connected to the angle connecting pipe 23 of the defect detector to move the defect detector and attach the strip contact roller 10 to the strip 1.

Hereinafter, a defect detecting apparatus for a strip according to the present invention will be described in detail with reference to FIG. 6.

As shown in the figure, the strip 1 is first applied with oil by the oiler 7 and then output through the guide roller 5 in the direction of the arrow on the drawing. At this time, when the handle 43 of the first detector moving screw 41a mounted on the detector fixing angle 40 is operated, the second detector moving screw 41b moves left and right. After operating the handle 43 to move the strip contact roller 10 of the defect detector to be in complete contact with the strip 1, the air cylinder 45 is operated to operate the above-described strip 1 and the defect detector. The contact rollers 10 are brought into contact with each other. When the strip 1 is contacted with the strip contact roller 10 described above and then output through the guide roller 5, if a defect 3 exists in the strip 1, the contact is caused by the defect 3 described above. The roller 21 vibrates and the vibration is detected by the left and right vibration detecting sensors 17a and 17b attached to the strip contact roller shaft 11.

The frequencies of the vibrations detected by the left and right vibration detection sensors 17a and 17b are amplified by the amplifiers of the vibration detection sensors 17a and 17b, filtered by the filters, and then input to the display unit through the connection jacks 22. By the input of the above-mentioned vibration frequency, the vibration detection warning light 29 of the display unit lights up to signal the presence of a defect, and at the same time, the left vibration warning light 30a or the right vibration warning light 30b lights up to signal the location of the defect. That is, the left and right vibration warning lamps 30a and 30b are turned on as described above, so that the occurrence position of the defects on the left and right sides can be determined.

The magnitude of the vibration frequency output from the left and right vibration detection sensors 17a and 17b is proportional to the size of the strip 1 defect. In order to determine the size of the defect, the volume control switch 35 displays a volume corresponding to each frequency band of each vibration frequency so as to determine the size of the defect by setting the volume of the volume control switch 35. It becomes possible.

That is, when the frequency corresponding to the magnitude of the defect detected by the left and right vibration detection sensors 17a and 17b is greater than the frequency band of the volume set by the volume control switch 35, the vibration detection warning light 29 lights up. And the left vibration warning light 30a or the right vibration warning light 30b is turned on, while a frequency corresponding to the magnitude of the defect detected by the left and right vibration detection sensors 17a and 17b is set in the volume control switch 35. When the frequency is smaller than the frequency band of the set volume, the vibration detection warning light 29, the left vibration warning light 30a or the right vibration warning light 30b are not turned on. In such a case, a defect of a frequency smaller than the frequency band of the set volume is not detected.

In the device of the present invention, vibrations caused by defects detected by the vibration sensors 17a and 17b are detected by frequency, but are not displayed to the driver how much the values are. Therefore, when a defect of more than a certain size is to be detected, the frequency corresponding to the defect of the specific size is first found and the volume corresponding to the frequency is set. When the defect of the specific size is detected, the vibration detection warning lamp 29 is turned on. The size of the defect can be determined. If one defect is present on the strip, the line continues to be detected and the defect is repeatedly detected and the volume can be set each time to determine the size of the defect.

For example, when a defect corresponding to the oscillation frequency 18 Hz occurs on the left side of the strip 1, the volume control switch 35 is set to volume 1 (vibration frequency 0 to 5 Hz) to determine the oscillation frequency and the magnitude of the defect. If set, the vibration detection warning light 29 and the left vibration warning light 30a are turned on at the same time to inform the driver of the presence and location of the defect. When the driver raises the volume level to the volume 2 (vibration frequency 5 to 10 Hz), the volume 3 (vibration frequency 10 to 15 Hz), and the volume 4 (vibration frequency 15 to 20 Hz), the driver detects the vibration. The warning light 29 and the left vibration warning light 30a are continuously lit, but when the volume is set to 5 (vibration frequency 20-25 Hz), the above-mentioned vibration detection warning light 29 and the left vibration warning light 30a are turned off. By the extinguishing described above, the driver recognizes that the size of the defect 3 corresponds to the volume 4, determines the size of the defect, and determines the frequency band corresponding to the size of the defect in Table 1 above.

In order to detect a defect larger than the defect corresponding to 18 Hz using this relationship, the volume control switch 35 should be set to volume 4. Then, if there is a defect of a frequency larger than the frequency band of the volume 4, the vibration detection warning light 29 is turned on and detected to determine the magnitude of the detected defect.

In practice, it does not detect the defects of negligible size because it does not affect the product of the strip, and it detects the defect of the size that affects the product and removes the foreign substances of the rolling roller, and the boundary affecting the product The size of the defect is set and the volume corresponding to the defect of the set size is set to detect only a defect larger than the size of the set defect.

As such, when it is desired to determine a more accurate size for any one defect, the volume control switch 35 may be adjusted in stages to determine the size of the defect depending on whether the vibration detection warning light 29 is turned on. In addition, in order to determine whether there are any foreign materials affecting the quality of the rolling roller or how many there are, the volume of the vibration detection warning light 29 is set by setting the volume at the volume control switch 35 according to the frequency of the defect affecting the quality. The presence or absence of foreign matter can be determined depending on whether it is lit, and the size of the defect can be determined accordingly. Therefore, the defect detection apparatus of the present invention is preferably convenient to use when detecting a defect of a specific size or more among defects occurring on the strip.

Simultaneously with the above-described warning lights 29 and 30a, various data such as the pitch of the defect 3 are displayed on the data display window 27. In the case of using a rolling roller having a diameter of 1500 mm, the pitch of defects on the strip due to foreign matter adhering to the rolling roller is 1500 mm x 3.14 = 4710 mm, and this value is displayed on the data display window 27 described above. Therefore, the driver can know the diameter of the rolling roller of the line connected to the display unit with reference to the above data.

In one embodiment of the present invention described above, although the defect detection apparatus is mounted on the line after the oil coating step, the defect detection apparatus may be installed on the line before the oil application. Therefore, the position and size of a defect which may occur in all the processes after a rolling process can also be detected correctly. In addition, the above-described defect detection apparatus is of course also applicable to all processes of continuously mailing strips.

The defect detection apparatus of the strip according to the present invention has the following effects.

First, since the defect detection device is mounted on the line, when the defect occurs, the exact position and size of the defect can be known with a small number of people without interruption of the line or deceleration of the line. have.

Second, since the size of the defect is detected by vibrating frequency, not by the naked eye or touch, the exact size of the defect can be known.

Third, since the defect detection device can be installed in the process after oil application, defects of the oil-coated strip after the rolling process can be accurately detected, and there is no need for coating gloves for visual inspection or touch test after oil application. Therefore, environmental pollution can be prevented.

Fourth, when the defect inspection, such as visual inspection or tactile inspection, direct contact of the driver to the strip is unnecessary, thereby preventing safety accidents.

Fifth, since the display unit is connected to the defect detector by a connecting jack and is supplied with power by a detachable battery, one display unit can be used by connecting to a required detector among a plurality of defect detectors installed in each line. Detection cost is reduced. In addition, since the pitch of the defect is displayed on the display unit, data such as the diameter of the rolling roller of the line to which the display unit is connected can be easily grasped.

Claims (1)

A roller in contact with the strip, and A defect detector installed at left and right sides of the roller and configured to detect a vibration of the roller due to a defect of a strip; And Warning lights indicating the detection of defects in the strip, A display window for displaying data input from the defect detector, and The display unit is configured to display the detected data connected to the sensor by configuring a volume control switch for specifying a volume set by the frequency band for the vibration frequency input from the defect detector through the above warning light. Defect detection device of the strip comprising a.

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