KR101049847B1 - Crack detection unit - Google Patents

Abstract

The crack detection unit according to the present invention acquires an image to detect cracks in the base metal, and to be symmetrical to both sides of the image processing apparatus and the image processing apparatus manufactured to prevent the inflow of contaminants therein through the purge of the fluid. It is disposed to irradiate the light source to the base material, and includes a first and a second lighting device manufactured to prevent the inflow of contaminants therein through the purge of the fluid.

Therefore, the present invention can solve the problem of contaminants attached to the window portion of the image processing apparatus, preventing the view of the camera, and the problem of lowering the brightness of the light source irradiated by the lighting apparatus by the contaminants. Therefore, an excellent image can be acquired with respect to a base material, and it can detect whether the crack of the said base material generate | occur | produced correctly.

Edge, Crack, Rolling Mill, Anti-Pollution

Description

Crack detection unit {Unit for decting crack}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crack detection unit, and relates to a crack detection unit capable of preventing contaminants from entering therein.

When rolling a base material such as an electrical steel sheet by using a rolling mill, for example, a cold rolling mill (CRM) and an ultra-thin cold mill (ZRM: sendzimir mill), cracks may occur in the base material due to a setting error or malfunction of the rolling mill. Can be. In order to detect this, a crack detection module was mounted in the rolling mill. However, since a large amount of contaminants such as oil and water vapor exist in the rolling mill, the contaminants enter the crack detection module and contaminate the crack detection module. That is, contaminants are attached to the camera constituting the crack detection module, the window part disposed under the camera, and protecting the camera. As a result, the camera cannot secure a field of view so that an excellent image cannot be obtained, and the brightness of the lighting device is lowered.

In order to solve the above problems, the present invention is to make the image processing apparatus and the lighting device constituting the crack detection unit to enable the purge of the fluid, so that the cracks to prevent contaminants from entering the image processing device and the lighting device. Provide a detection unit.

The crack detection unit according to the present invention obtains an image to detect cracks in the base material, and is designed to prevent the inflow of contaminants through the purge of the fluid, and the symmetry on both sides of the image processing device It is arranged to achieve a light source to the base material, and comprises a first and second lighting device to prevent the contaminants from entering through the purge of the fluid.

The first and second lighting devices have an acute angle between the center line of the light source irradiated to the base material region to be detected by the first and second lighting apparatuses and the central extension line of the image processing apparatus toward the base material region to be detected. It is arranged to achieve.

The first and second lighting devices have the same angle as the center line of the light source irradiated to the base material area to be detected by the first and second lighting devices and the center extension line of the image processing device toward the base material area to be detected. Is arranged to.

The image processing apparatus may include a sensor housing having an internal space, a sensing unit disposed in the sensor housing and acquiring an image to detect cracks in the base material, and purging the sensing unit to introduce contaminants into the sensing unit. And a first purge means for preventing and a second purge means disposed under the sensor housing to prevent contaminants from entering the sensor housing.

One end of the sensor housing is provided with an inlet through which an external fluid is introduced, and the other end is provided with an outlet through which the fluid is discharged.

The sensing unit includes a cover provided with an inner space, a camera disposed in the cover to acquire an image of the base material, and a window unit disposed corresponding to the front side of the camera to protect the camera.

The first purge means is disposed so as to communicate with one side of the cover to be discharged to the lower portion of the cover and the first pipe for injecting fluid to the lower side of the window portion disposed in the cover, the flow of fluid injected to the lower side of the window portion And a first guide member for controlling and discharging into the sensor housing.

The second purge means is connected to a lower part of the sensor housing and is formed in a cylindrical shape of which the diameter becomes narrower toward the lower side, and disposed on both outer sides of the outlet of the sensor housing in the discharge member to face each other. And a first air knife and a second air knife for respectively injecting a high pressure fluid, and a lower side of the separation space between the first air knife and the second air knife, and injected from the first and second air knife. And a second guide member configured to control the flow of the fluid and discharge the fluid to the discharge member.

Each of the first and second air knives includes a supply part connected to a second pipe for providing a fluid and having an internal space, and upper and lower lips facing each other to form a discharge port through which the air is discharged. do.

Upper and lower lips of each of the first and second air knives are mounted to the supply portion so as to face the direction in which the second guide member is disposed.

An upper portion of the second guide member communicates with a space between the first air knife and the second air knife, and a lower portion of the second guide member communicates with the discharge member.

The second guide member is manufactured in a smaller size than that of the discharge member and is disposed in the discharge member, and is manufactured in a cylindrical shape having a smaller diameter toward the lower side.

Each of the first and second lighting apparatuses is disposed to correspond to a light source generating module for illuminating a base material and the light source generating module, and a purge for preventing contaminants from entering the light source generating module through purging of the fluid. Means;

The light source generating module includes a lighting housing having an inner space, a light source unit disposed in the lighting housing to generate a light source, and a window unit disposed below the light source unit to protect the light source unit.

The purge means is disposed on both outer sides of the window portion at the lower side of the housing, disposed to face each other, and spaced between the first and second air knives and the first and second air knives for respectively injecting a high pressure fluid. It is disposed under the space, and includes a guide member for controlling and discharging the flow of the fluid injected from the first and second air knife.

Each of the first and second air knives includes a supply part connected to a pipe for providing a fluid and having an internal space, and upper and lower ribs facing each other to form a discharge port through which the air is discharged.

The guide member is disposed to correspond to the lower side of the separation space between the first air knife and the second air knife, and is manufactured to have a narrower diameter toward the lower side.

The image processing apparatus, the first and the second lighting apparatus are installed in the rolling mill.

As described above, the present invention manufactures the image processing device and the lighting device constituting the crack detection unit so that the fluid can be purged. Thus, the contamination of the contaminants into the image processing apparatus and the lighting apparatus may be blocked by the purge of the fluid. As a result, it is possible to solve the problem that contaminants adhere to the window unit and the lighting apparatus of the image processing apparatus. Therefore, an excellent image can be acquired with respect to a base material, such as an electrical steel plate currently rolling, and it can detect whether the crack of the said base material generate | occur | produces correctly.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in different forms, only the present embodiments are intended to enable the disclosure of the present invention to be completed and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you. Like numbers refer to like elements on the drawings.

1 is a block diagram of a crack detection unit according to an embodiment of the present invention. 2 is a view for explaining the arrangement of the image processing apparatus, the first and second lighting apparatus of the crack detection unit according to an embodiment of the present invention.

Referring to FIG. 1, a crack detection unit according to an exemplary embodiment of the present invention may include first and second detection devices 400 and 500 and first and second detection devices disposed correspondingly on an edge portion of a base material M, respectively. It is connected to the signal 400, 500, and the conversion means 600 for converting the image signal input from the first and second detection device (400, 500) into a digital signal. In the present embodiment, the base metal (M) uses an electrical steel sheet containing a large amount of silicon, but is not limited thereto, and various materials may be used. In the present embodiment, the crack detection system is mounted in a rolling mill to detect cracks in the edge portion of the base material M in the rolling mill. Here, the rolling mill may be any one of a cold rolling mill (CRM) and an ultra-thin cold mill (ZRM). In this case, the first and second detection apparatuses 400 and 500 according to the present exemplary embodiment may detect cracks in the edge portion without being contaminated by contaminants such as oil and water vapor in the rolling mill.

The first and second detection devices 400 and 500 are devices for detecting cracks in the edge portion of the base material M, and are disposed correspondingly above the edge portion of the base material M. Here, since the first and second detection devices 400 and 500 have the same configuration, the description of the second detection device 500 will be omitted below. The first detection device 400 is disposed above the edge portion of the base material M to acquire an image of the edge portion, and is disposed to be symmetrical on both sides of the image processing apparatus 100. It includes a first and second lighting device (200, 300) for irradiating the light to the part. In addition, it is preferable that the detection area of the edge portion acquired by the image processing apparatus 100 is 50 mm to 100 mm. This is because the accuracy of crack detection is inferior when the detection area is 50 mm to 100 mm. In addition, in the present embodiment, as described above, the first and second lighting apparatuses 200 and 300 are disposed to be symmetrical to both sides of the image processing apparatus 100. Here, the first and second lighting devices 200 and 300 are disposed not to be perpendicular to the edge of the base material M, but to be inclined. That is, the first and second lighting devices have an angle formed by the center line of the light source irradiated to the base material region to be detected by the first and second lighting apparatuses and the center extension line of the image processing apparatus toward the base material region to be detected. It is arranged to form an acute angle. In addition, when the center line of the light source irradiated by the first and second lighting apparatuses 200 and 300 is perpendicular to the edge portion, the light source reflected from the edge portion is a camera (not shown) of the image processing apparatus 100. This is because it is emitted to the outside of the base material M without being incident on the substrate. As a result, an excellent image of the edge portion cannot be acquired by the image processing apparatus 100. In addition, the first and second lighting devices may be formed of an angle formed by a center line of the light source irradiated to the base material region to be detected by the first and second lighting apparatuses and a central extension line of the image processing apparatus toward the base material region to be detected. It is preferable to arrange so that (theta) ₁ , (theta) ₂ ) may be the same. That is, it is preferable that the inclination angle of the first lighting device 200 and the second lighting device 300 is the same.

2 is a diagram illustrating an image processing apparatus 100 according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the image processing apparatus 100 according to the embodiment includes a sensor housing 120 having an internal space and a sensing unit disposed in the sensor housing 120 to acquire an image of an edge portion of the base material M. FIG. 110 and a first purge means 150 for purging a fluid in the sensing unit 110 to prevent contaminants from flowing into the sensing unit 110 and a lower portion of the sensor housing 120. It includes a second purge means 130 for preventing contaminants from entering the sensor housing 120.

The sensor housing 120 is manufactured in a rectangular box shape or a cylindrical shape provided with an inner space. Of course, the present invention is not limited thereto, and may be manufactured in various shapes having internal spaces. An upper portion of the sensor housing 120 is provided with an inlet 141 through which external fluid, for example, air, flows into the sensor housing 120, and an outlet through which the air introduced into the sensor housing 120 flows out. 142 is provided.

The sensing unit 110 is installed inside the housing 120 and serves to acquire an image of the base material M. The sensing unit 110 according to the present exemplary embodiment acquires an image of the edge portion of the base material M and detects a crack of the edge portion. The sensing unit 110 corresponds to a cover 113 having an inner space, a camera 111 disposed in the cover 113 to acquire an image of the edge portion, and a lower side of the camera 111 in the cover 113. The window unit 112 is disposed to protect the camera 111. In this embodiment, a line scan camera is used as the camera 111. The line scan camera is an apparatus for acquiring an image of a moving object and includes an image sensor camera (not shown) for acquiring an image of a moving object and a controller (not shown) for driving the image sensor camera. The camera 111 is disposed to correspond to the upper side of the edge portion of the base material (M), it is preferably disposed to be perpendicular to the base material (M). The window 112 is disposed on the front side of the camera 111 to serve to protect the camera 111. In this case, the window 112 may be manufactured using a light transmissive plate, for example, quartz. Of course, the present invention is not limited thereto, and the window unit 112 may be manufactured using various light transmitting materials.

The first purge means 150 serves to prevent contaminants from adhering to the window portion 112 by purging the fluid under the window portion 112. In this embodiment, air is used as the fluid. The first purge means 150 is connected to one side of the cover 113 of the first pipe 151 and the cover 113 to supply air to the lower side of the window portion 112 disposed in the cover 113 It is connected to the lower includes a first guide member 152 manufactured to protrude to the lower side of the cover. Here, the first guide member 152 is manufactured in a cylindrical shape having an internal space, but is not limited thereto and may be manufactured in various shapes having an internal space. The first guide member 152 serves to discharge the air injected downward of the window portion 112 into the sensor housing 120 through the first guide member 152. Here, the pipe is preferably coupled to one side of the cover 113 of the lower side of the window 112. As such, by spraying air to the lower side of the window 112 using the first purge means 150 and discharging it into the sensor housing 120, it is possible to prevent the contaminants from adhering to the window 112. Can be. The contaminants may be prevented from adhering to the window 112 by using a flow of air transferred to the lower side of the window 112.

The second purge means 130 is connected to the lower portion of the sensor housing 120 and is disposed to face each other in the discharge member 134 and the discharge member 134 produced in a cylindrical shape that the diameter becomes smaller toward the lower side is a high pressure The first and second air knives 132a and 132b for injecting the air therebetween, and the first and second air knives 132a and the second air knives 132b are disposed to correspond to the lower side of the separation space. And a second guide member 133 for controlling the flow rate and flow of the air injected by the two air knives 132a and 132b.

The discharge member 134 primarily blocks the contaminants from flowing into the second guide member 133 and the sensor housing 120, or induces the flow of air discharged by the second guide member 133. It serves to discharge to the outside of the discharge member 134. This, the discharge member 134 is connected to the lower portion of the sensor housing 120, is manufactured in a cylindrical shape that becomes narrower toward the lower side. This is to prevent the air from flowing backward at the end of the discharge member 134, that is, the area where the air flows out, and block external contaminants from entering the discharge member 134. Of course, the present invention is not limited thereto, and the discharge member 134 may be manufactured in various cylindrical shapes, the diameter of which is narrowed toward the lower side.

The first and second air knives 132a and 132b serve to inject high pressure air to the lower side of the outlet 142 formed under the sensor housing 120. Each of the first and second air knives 132a and 132b includes supply parts 132a-1 and 132b-1 connected to second pipes 131a and 131b for supplying air, and supply parts 132a-1 and 132b-1. And upper and lower ribs 132a-2, 132a-3, 132b-2, and 132b-3 which are mounted to form a discharge hole through which air is discharged. Here, each of the upper and lower lips 132a-2, 132a-3, 132b-2, and 132b-3 is disposed to face each other so that the air of the supply parts 132a-1 and 132b-1 is in the upper lip 132a-1. , 132b-1) and the lower lip 132a-2, it is preferably disposed so as to be injected through the separation space, that is, the discharge port. In addition, the discharge port between the upper lip (132a-1, 132b-1) and the lower lip (132a-2, 132b-2) is preferably disposed in the direction in which the second guide member 133 is disposed. Each of the first and second air knives 132a and 132b is mounted at both outer sides of the outlet 142 of the sensor housing 120 at the bottom of the sensor housing 120. Accordingly, when air is supplied to the supply parts 132a-1 and 132b-1 through the second pipes 131a and 131b, the air is provided at the upper and lower ribs 132a-2, 132a-3, 132b-2, and 132b. -3 is injected at high speed through the discharge port formed between. In addition, the air injected at high speed through the discharge port is transferred into the second guide member 133 located below the first and second air knifes 132a and 132b. Thereafter, the air is controlled by the second guide member 133 and discharged outside the second guide member 133, that is, into the discharge member 134.

The second guide member 133 secondaryly blocks the inflow of contaminants into the sensor housing 120 or induces a flow of air discharged from the first and second air knives 132a and 132b to discharge the member. 134 to be discharged. In addition, it serves to maintain the flow rate of the air discharged from the first and second air knife (132a, 132b). The second guide member 133 is preferably disposed below the space between the first air knife 132a and the second air knife 132b. In addition, the second guide member 133 is produced in a cylindrical shape in which the diameter becomes narrower toward the lower side. In this embodiment, the second guide member 133 is manufactured into a cylindrical shape whose diameter decreases toward the lower side. Accordingly, the air flows from the first and second air knives 132a and 132b by the second guide member 133 and is discharged to the outside of the second guide member 133. Thereafter, the air discharged from the second guide member 133 is controlled by the discharge member 134 and discharged to the outside of the discharge member 134. As such, by injecting air into the lower portion of the sensor housing 120 using the second purge means 130 and discharging the air, it is possible to prevent contaminants from entering the sensor housing 120.

3 is a view showing a first lighting device according to an embodiment of the present invention.

The first and second lighting apparatuses 200 and 300 are disposed to be symmetrical to both sides of the image processing apparatus 100 to serve to illuminate the edge portion of the base material M. Since the first and second lighting apparatuses 200 and 300 are manufactured in the same configuration and shape, only the first lighting apparatus 200 will be described below.

Referring to FIG. 4, the first lighting device 200 is disposed under the light source generating module 210 and the light source generating module 210 that irradiates a light source to an edge of the base material M, and the light source generating module 210. It includes a purge means 220 to prevent contaminants from flowing into.

The light source generating module 220 includes a plurality of light source units 211 for producing a light source, an illumination housing 212 covering the plurality of light source units 211, and a light source unit 211 in the illumination housing 212. It is disposed below the and includes a window portion 213 for protecting the light source unit 211. In this embodiment, a light emitting diode that emits a red light source is used as the light source generator. The lighting housing 212 is manufactured in a rectangular box shape or a cylindrical shape provided with an inner space. Of course, the present invention is not limited thereto, and may be manufactured in various shapes provided with internal spaces.

The purge means 220 is provided on both outer sides of the lower side of the window portion 213, and the first and second air knife 221a, 221b for injecting high pressure air, and the first and second air knife 221a, 221b. And a guide member 222 disposed correspondingly to a lower side of the separation space and controlling the flow of air injected from the first and second air knives 221a and 221b.

The first and second air knives 221a and 221b serve to inject high pressure air into the lower side of the window 213. Each of the first and second air knives 221a and 221b is connected to supply parts 221a-1 and 221b-1 connected to pipes 223a and 223b for supplying air and to supply parts 221a-1 and 221b-1. And upper and lower ribs 221a-2, 221a-3, 221b-2, and 221b-3 mounted to face each other so as to form discharge holes through which air is discharged. Here, each of the upper and lower ribs 221a-2, 221a-3, 221b-2, and 221b-3 is disposed to face each other so that air from the supply parts 221a-1 and 221b-1 is discharged from the upper lip 221a-2. , 221a-3 and the lower lip (221b-2, 221b-3) is formed so as to be spaced apart, that is to be injected through the discharge port. In addition, the discharge port between the upper lip (221a-2, 221a-3) and the lower lip (221b-2, 221b-3) is preferably arranged in the direction in which the guide member 222 is disposed. Each of the first and second air knives 221a and 221b is mounted at both outer sides of the window 213 at the lower portion of the lighting housing 212. Therefore, when air is supplied to the supply parts 221a-1 and 221b-1 through the pipes 223a and 223b, the air is upper and lower lips 221a-2, 221a-3, 221b-2 and 221b-3. It is injected at high speed through the discharge port formed between. The high speed jet air is discharged to the guide member 222 positioned below the first and second air knifes 221a and 221b and then discharged to the outside of the guide member 222.

5 is a photograph of crack detection of an edge portion of a mother using a crack detection system according to an exemplary embodiment of the present invention. FIG. 6 is an enlarged view of the crack shown in FIG. 5.

Hereinafter, referring to FIGS. 1 to 4, the crack of the edge portion of the base material M is detected using a crack detection unit according to an embodiment of the present invention, and the contaminants of the crack detection unit adhere to the cracks. Explain how to avoid it.

First, the crack detection unit according to the embodiment is mounted inside a rolling mill, for example, one of a cold rolling mill (CRM) and an ultra-thin cold rolling mill (ZRM). And the crack detection unit is used to detect the crack of the edge part of the base material M in a rolling mill.

Referring to FIG. 1, each edge portion of the base material M is disposed correspondingly to the lower portions of the first and second detection devices 400 and 500. Here, the base material M according to the present embodiment uses an electrical steel sheet with a high content of silicon. Of course, without being limited to this, various steel materials may be used as the base material (M). The first and second detection apparatuses 400 and 500 acquire images of the edge portion. Hereinafter, a method of acquiring an image of the edge portion by the first detection device 400 will be described. First, the light source is irradiated to the edge region of the base material M to be detected by using the first and second lighting devices 200 and 300. At this time, it is preferable that the first and second lighting devices 200 and 300 are arranged not to be perpendicular to the edge portion of the base material M, but to be inclined. That is, it is preferable that the center line and the edge portion of the light source irradiated to the edge portion of the base material M by the first and second lighting devices 200 and 300 form an acute angle. Then, the angle θ ₁ formed by the center line of the light source irradiated to the edge portion of the base material M by the first lighting device 200 and the edge portion, and the edge portion of the base material M by the second lighting device 300. additional center line and the edge of the illumination source to achieve preferably arranged to be equal to the angle θ _2. Then, the image of the edge portion is acquired using the image processing apparatus 100. That is, the light sources emitted by the first and second lighting apparatuses 200 and 300 and irradiated to the edge portion are reflected from the edge portion and incident to the camera 111 of the image processing apparatus 100. Thus, as illustrated in FIGS. 5 and 6, the image processing apparatus 100 may acquire an image of an excellent edge portion, and analyze the image to detect whether or not a crack has occurred.

The crack detection module according to the present embodiment is installed in the rolling mill as described above. Here, a large amount of oil is injected into the rolling mill, and a large amount of water vapor is generated. However, by using the crack detection module according to the embodiment of the present invention, it is possible to prevent contaminants such as oil and water vapor from entering the crack detection system. In this case, while acquiring an image of the edge portion using the camera 111 of the image processing apparatus 100, air is injected into the lower portion of the window portion 112 using the first purge means 150. That is, air is injected into the lower side of the window portion 112 correspondingly disposed below the camera 111 by using the first purge means 150. Thereafter, the air injected under the window 112 is controlled to flow and flow through the first guide member 152 to be discharged into the sensor housing 120. As such, by spraying air to the lower side of the window 112 using the first purge means 150 and discharging it into the sensor housing 120, it is possible to prevent the contaminants from adhering to the window 112. Can be. The air discharged into the sensor housing 120 includes an outlet 142 provided under the sensor housing 120, a second guide member 133 and a discharge member 134 disposed under the sensor housing 120. Through the outflow of the image processing apparatus 100.

At the same time, the air is injected into the lower side of the sensor housing 120 using the second purge means 130 and discharged, thereby preventing contaminants from entering the sensor housing 120. That is, high pressure air is injected into the lower side of the sensor housing 120 using the first and second air knives 132a and 132b. In this case, the first and second air knives 132a and 132b are disposed at both outer sides of the outlet 142 provided at the lower portion of the sensor housing 120, and the air is lowered below the outlet 142 of the sensor housing 120. Spray it. In addition, the air and the flow rate of the air injected by the first and second air knifes 132a and 132b are controlled by the second guide member 133 and discharged out of the second guide member 133. The air discharged from the second guide member 133 is controlled by the discharge member 134 disposed to surround the second guide member 133 and discharged to the outside of the discharge member 134. As such, by continuously repeating the process of injecting air into the lower side of the sensor housing 120 and discharging it by using the second purge means 130, it is possible to prevent contaminants from entering the sensor housing 120. Can be. In addition, at this time, the outside air is continuously introduced into the sensor housing 120 through the inlet 141 disposed in the upper portion of the sensor housing 120, so that the pressure in the sensor housing 120 and the second purge means 130 is increased. The car can prevent the air from flowing back.

In addition, in the first lighting device 200, the air is sprayed to the lower side of the window unit 213 using the purge means 220. That is, high-pressure air is injected to the lower side of the window portion 213 using the first and second air knives 221a and 221b. Air injected by the first and second air knives 221a and 221b is controlled by the guide member 222 to control the flow and flow rate of the air and is discharged to the outside of the guide member 222. As such, by continuously repeating the process of injecting air into the lower portion of the window portion 213 using the purge means 220 and discharging the air, the contaminants may be prevented from adhering to the window portion 213.

1 is a block diagram of a crack detection system in accordance with an embodiment of the present invention.

2 is a view for explaining the set angle of the camera, the first and second lighting apparatus in the crack detection system according to an embodiment of the present invention.

3 shows a detection device according to an embodiment of the invention.

4 is a view showing a lighting device according to an embodiment of the present invention.

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

100: image processing apparatus 110: sensing unit

130: second purge means 150: first purge means

200: first lighting device 210: sensing unit

210: light source generating unit 220: purge means

Claims (18)

A sensor housing provided with an inner space; A sensing unit disposed in the sensor housing to acquire an image and detect cracks in the base material; And An image processing apparatus having purge means for injecting and purging fluid into the sensing unit and the outside of the sensor housing; And a first and a second lighting device arranged to be symmetrical to both sides of the image processing device to irradiate a light source to the base material, and to prevent contaminants from entering through the purge of the fluid. The method according to claim 1, The first and second lighting devices have an acute angle between the center line of the light source irradiated to the base material region to be detected by the first and second lighting apparatuses and the central extension line of the image processing apparatus toward the base material region to be detected. Crack detection unit arranged to achieve. The method according to claim 2, The first and second lighting devices have the same angle as the center line of the light source irradiated to the base material area to be detected by the first and second lighting devices and the center extension line of the image processing device toward the base material area to be detected. And a crack detection unit arranged to. The method according to claim 1, The image processing apparatus may include: first purging means for purging the inside of the sensing unit to prevent contaminants from entering the sensing unit; And a second purge means disposed under the sensor housing to prevent contaminants from entering the sensor housing. The method according to claim 1, One end of the sensor housing is provided with an inlet for the inflow of external fluid, the other end is formed in communication with the second purge means crack detection unit is provided with an outlet for the discharge of the fluid. The method according to claim 1, The sensing unit includes a cover provided with an inner space, a camera disposed in the cover to acquire an image of the base material, and a window unit disposed corresponding to the front side of the camera to protect the camera. The method according to claim 4, The first purge means is disposed so as to communicate with one side of the cover to be discharged to the lower portion of the cover and the first pipe for injecting fluid to the lower side of the window portion disposed in the cover, the flow of fluid injected to the lower side of the window portion And a first guide member for controlling and discharging into the sensor housing. The method according to claim 4, The second purge means is connected to the lower portion of the sensor housing and the discharge member is formed in a tubular shape narrowing toward the lower side; First and second air knives disposed on both outer sides of the outlet of the sensor housing in the discharge member and disposed to face each other, respectively, for injecting a high pressure fluid; A second guide member corresponding to a lower side of the separation space between the first air knife and the second air knife to control the flow of the fluid injected from the first and second air knives to discharge to the discharge member; Crack detection unit. The method according to claim 8, Each of the first and second air knives includes a supply part connected to a second pipe for providing a fluid and having an internal space, and upper and lower lips facing each other to form a discharge port through which the air is discharged. Crack detection unit. The method according to claim 9, The upper and lower lips of each of the first and second air knives are mounted to the supply part so as to face the direction in which the second guide member is disposed. The method according to claim 8, The upper portion of the second guide member is in communication with the separation space between the first air knife and the second air knife, the crack detection unit is disposed so as to communicate with the discharge member. The method according to claim 8, The second guide member is manufactured to have a smaller size than that of the discharge member and is disposed in the discharge member, and the crack detection unit is manufactured to have a cylindrical shape with a narrower diameter toward the lower side. The method according to claim 1, Each of the first and second lighting apparatuses includes a light source generating module for irradiating illumination to a base material; And a purge means disposed corresponding to a lower side of the light source generating module and preventing contaminants from being introduced into the light source generating module through purging of the fluid. 14. The method of claim 13, The light source generation module includes a lighting housing provided with an inner space; A light source unit disposed in the lighting housing to generate a light source; And a window unit disposed corresponding to the lower side of the light source unit to protect the light source unit. 14. The method of claim 13, The purge means may include: first and second air knives disposed on both outer sides of the window portion at the lower side of the housing and disposed to face each other and respectively inject a high pressure fluid; And a guide member disposed below the separation space between the first air knife and the second air knife to control and discharge the flow of the fluid injected from the first and second air knives. 16. The method of claim 15, Each of the first and second air knives includes a supply part connected to a pipe for providing a fluid and having an inner space, and an upper and a lower lip disposed to face each other to form a discharge port through which the air is discharged. Detection unit. 16. The method of claim 15, The guide member is disposed to correspond to the lower side of the separation space between the first air knife and the second air knife, the crack detection unit is manufactured to be narrower toward the lower side. The method according to claim 1, The image processing apparatus, the first and second lighting apparatus is a crack detection unit installed in the rolling mill.

Images