Surface defect detection device for high-speed strip steel cold rolling line based on machine visual identification

Abstract

The invention relates to the technical field of machine vision surface detection, in particular to a machine vision recognition-based surface defect detection device applied to a high-speed strip steel cold rolling line. A guide rail base is arranged, and a C-shaped main body frame, a servo driving assembly, a detection assembly and a blowing air pipe assembly are arranged on the guide rail base in a sliding mode; wherein the guide rail base comprises a detection working section and a debugging preparation section; the main body frame comprises two straight arms which are arranged up and down in the extension direction of the guide rail base, and the detection assembly and the blowing air pipe assembly are arranged on the sides, facing strip steel, of the straight arms; the light emitting direction of the light source unit is inclined for 5-30 degrees towards one side of the camera unit; the purge air pipe assembly comprises a first purge air pipe blowing towards the camera unit and a second purge air pipe blowing towards the light source unit. According to the design, compact up-down integrated design is achieved through the C-shaped main body frame, and dirt purging is achieved through the purging air pipe assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of machine vision surface detection, and in particular to a surface defect detection device based on machine vision recognition and applied to a high-speed strip steel cold rolling line. Background Art

[0002] During the rolling process of the strip steel on the high-speed strip cold rolling line, the surface may crack or produce other defects due to local overheating or decarburization due to material problems of the steel billet, improper temperature or speed control.

[0003] Currently, some companies are using online inspection methods, utilizing machine vision recognition technology, to inspect the surface defects of steel strips. Strip surface quality inspection systems are key equipment for ensuring strip surface quality. They are typically located at the exit of production lines and are used to detect surface defects, enabling quality inspectors to grade the strip surface quality. Based on visual recognition technology, high-speed cameras continuously scan and photograph the upper and lower surfaces of the running strip, forming a clear image of the strip surface. This image is then analyzed by a processing unit using a specific algorithm to extract features from the defects. Finally, a decision-making classification algorithm is used to determine the defect category and present it to a computer system (including information such as defect category, location, and size).

[0004] A clear image of the strip surface is a prerequisite for ensuring the efficient operation of the strip surface quality inspection system. The traditional design is to place detection elements such as cameras in the sensor room, and the corresponding light source equipment in the light source room. The sensor room and the light source room are equipped with glass windows to protect the equipment from contamination by impurities such as oil, gas, and dirt on site.

[0005] However, the high-speed cold rolling line has a small space, and the traditional surface quality inspection system is bulky and inconvenient to install. Furthermore, due to the high production line speed, the surface of the strip is hot during the rolling process, and after being rolled by the rollers, a lot of oxidized flaky oxides and dust are produced. There is also a lot of oil, gas, emulsions, and sludge at the rolling site, which may fall on the glass windows of the sensor room and the light source room. However, the production line cannot be wiped while it is running, which will affect the inspection effect over time. Even after the production line stops, due to the small space of the cold rolling line and the high temperature of the equipment, it cannot be immediately entered, and the inspection system cannot be easily wiped. Here, the surface quality inspection system is located in a relatively closed space. The surface quality inspection system is always located inside the production line during operation or shutdown. The high temperature environment will seriously affect the service life of the equipment. Summary of the Invention

[0006] (1) Technical issues to be resolved In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a surface defect detection device based on machine vision recognition for use in a high-speed strip cold rolling line to solve the technical problem that the existing high-speed strip cold rolling line has a narrow line space, a fast production line speed, and a harsh environment, resulting in poor performance of the surface defect detection device system.

[0007] (2) Technical solution In order to achieve the above-mentioned object, the present invention provides a surface defect detection device based on machine vision recognition and applied to a high-speed strip cold rolling line, wherein a detection station for the surface defect detection device is provided on the horizontal conveying strip conveying path of the high-speed strip cold rolling line, and the surface defect detection device includes a guide rail base, a C-shaped main frame slidably arranged on the guide rail base, a servo drive assembly, a detection assembly and a purge air pipe assembly; wherein, The guide rail base is mounted on the ground of the inspection station, and a guide rail is provided on the top surface of the guide rail base. The guide rail base includes an inspection working section located below the strip steel and a debugging preparation section located on the side of the high-speed strip steel cold rolling line. The direction of the guide rail is parallel to the strip steel and perpendicular to the conveying direction of the strip steel. The bottom of the main frame is provided with a walking wheel, and the servo drive assembly drives the main frame to move along the guide rail on the guide rail base, so that the main frame switches between the inspection working section and the debugging preparation section. The main frame includes two upper and lower straight arms arranged along the extension direction of the guide rail base and a vertical connecting arm connecting the two straight arms, and the detection assembly and the purge air pipe assembly are both arranged on the side of the straight arm facing the strip steel; The detection assembly includes a camera unit for sampling the surface of the steel strip in a vertical direction, and a light source unit arranged on the side of the camera unit along the conveying direction of the steel strip; the camera unit is arranged in the inner cavity of the straight arm, and the light source unit is hung on the side of the straight arm through a bracket; the light output direction of the light source unit is inclined by 5°-30° toward one side of the camera unit; The purge air pipe assembly includes an air pump and a first purge air pipe and a second purge air pipe connected to the air pump and arranged along the extension direction of the straight arm; the air port of the first purge air pipe blows toward the camera unit to purge dirt on the lens glass of the camera unit; the air port of the second purge air pipe blows toward the light source unit to purge dirt on the light output glass of the light source unit.

[0008] Preferably, the number of the detection components and the number of the purge air pipe components are both 2, which are respectively arranged on the two straight arms.

[0009] Preferably, the light source unit on the lower straight arm is located on the first side of the camera unit, and the light source unit on the upper straight arm is located on the second side of the camera unit, and the first side and the second side are two different directions along the conveying direction of the strip.

[0010] Preferably, the first side is in the same direction as the conveying direction of the steel strip, and the second side is in the opposite direction to the conveying direction of the steel strip.

[0011] Preferably, the light source unit includes a long strip of shell arranged along the extension direction of the straight arm, a light source arranged in the shell and a light-emitting glass arranged on the light-emitting opening of the shell; the shell includes a back panel, two oppositely arranged side panels, two oppositely arranged end panels and the light-emitting opening; the back panel is connected to the bracket to fix the light source unit to the straight arm; the height of the first side panel away from the camera unit is greater than the height of the second side panel close to the camera unit, and the plane where the light-emitting opening is located forms an angle with the horizontal plane, so that the light-emitting direction of the light source unit is inclined 5°-30° toward one side of the camera unit.

[0012] Preferably, the first purge air pipe is arranged on the side adjacent to the camera unit and the light source unit, and the second purge air pipe is arranged on the side close to the light output glass of the first side panel away from the camera unit; the first purge air pipe and the second purge air pipe are high-temperature resistant glass tubes.

[0013] Preferably, the detection assembly includes a plurality of light sources and cameras arranged along the extension direction of the straight arm; the length of the purge air pipe assembly in the extension direction of the straight arm is greater than the length of the detection assembly in the extension direction of the straight arm.

[0014] Preferably, a cooling component is also included for cooling the detection component.

[0015] Preferably, the guide rail base includes the guide rail, a shelf parallel to the guide rail and located below the guide rail, and multiple support columns supporting the guide rail and the shelf; the electrical connection lines of the servo drive assembly, detection assembly and purge air pipe assembly are connected to the external power supply and controller through a drag chain, and the drag chain is placed on the shelf.

[0016] Preferably, the servo drive is in transmission connection with at least one of the travel wheels to drive the travel wheel to move on the guide rail.

[0017] (3) Beneficial effects The present invention provides a surface defect detection device for a high-speed steel strip cold rolling line based on machine vision recognition, which comprises a guide rail base, a C-shaped main frame slidably arranged on the guide rail base, a servo drive assembly, a detection assembly, and a purge air pipe assembly. The guide rail base is mounted on the ground of the detection station, and a guide rail is provided on the top surface of the guide rail base. The guide rail base includes a detection working section located below the steel strip and a debugging preparation section located on the side of the high-speed steel strip cold rolling line. The main frame includes two straight arms arranged vertically along the extension direction of the guide rail base and a connecting arm vertically connecting the two straight arms. The detection assembly and the purge air pipe assembly are both arranged on the side of the straight arm facing the steel strip. The light emitting direction of the light source unit is inclined by 5°-30° toward one side of the camera unit. The purge air pipe assembly includes a first purge air pipe blowing toward the camera unit, and a second purge air pipe blowing toward the light source unit. The surface defect detection device for a high-speed steel strip cold rolling line based on machine vision recognition provided by the present invention has at least the following beneficial effects: (1) The C-shaped main frame realizes a compact upper and lower integrated design. Under the condition of the narrow space of the high-speed strip cold rolling line, only a very narrow space is required for installation; (2) The guide rail base includes a detection working section located below the strip and a debugging preparation section located on the side of the high-speed strip cold rolling line. The detection working section is located below the strip at the detection station, and the debugging preparation section is located on the side of the high-speed strip cold rolling line. When the surface defect detection device is working, the main frame moves to the detection working section. When surface defect detection is no longer required, the main frame moves to the debugging preparation section, which does not affect other operations of the high-speed strip cold rolling line. At the same time, since the cold rolling temperature of the strip is generally 600℃-800℃ when the high-speed strip cold rolling line is working, electronic components such as cameras and light sources are in a high-temperature state. Reducing their time in a high-temperature environment is beneficial to extending the working life of the electronic components. (3) The light emitting direction of the light source unit is tilted 5°-30° toward one side of the camera unit 241, so that the light from the light source unit can illuminate the sampling area of the camera unit at a better angle, thereby reducing the inaccuracy of the sampling image caused by light problems, thereby reducing the deviation of the detection results; (4) The direction in which the air outlet of the first purge air pipe blows toward the camera unit may be parallel to the surface of the lens glass of the camera unit, or slightly tilted toward the lens glass, so that dirt on the lens glass can be blown away; the direction in which the air outlet of the second purge air pipe blows toward the light source unit may be parallel to the surface of the light output glass of the light source unit, or slightly tilted toward the light output glass, so as to blow away dirt on the light output glass of the light source unit; (5) The light source unit on the lower straight arm is located on the first side of the camera unit, and the light source unit on the upper straight arm is located on the second side of the camera unit. The first side and the second side are two different directions along the conveying direction of the strip steel; the blowing directions of the first purge air pipes arranged above and below are opposite, and the blowing directions of the second purge air pipes are opposite, so that the same-direction airflow will not be generated to cause the dirt to be rolled back, thereby reducing the conditions for shooting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the high-speed strip cold rolling line and the surface defect detection device of the present invention.

[0019] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the surface defect detection device in the detection working section.

[0020] Figure 3 for Figure 1 Schematic diagram of the structure of the surface defect detection device from another angle.

[0021] Figure 4 This is a structural diagram of the main frame.

[0022] Figure 5 for Figure 4 A structural diagram of the main frame from another angle.

[0023] Figure 6 It is a structural diagram of the lower straight arm.

[0024] Figure 7 Schematic diagram of the structure of the upper straight arm.

[0025] Figure 8 This is the front view of the surface defect detection device.

[0026] Figure 9 This is the right side view of the surface defect detection device.

[0027] Figure 10 For the Figure 9 Cross-sectional view in the BB direction. DETAILED DESCRIPTION

[0028] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below with reference to the accompanying drawings and through specific embodiments. Figure 1 The orientation is referenced.

[0029] like Figures 1 to 10 As shown, the present invention provides a structural schematic diagram of a surface defect detection device 20 applied to a high-speed strip cold rolling line 10 in an embodiment.

[0030] An inspection station 30 for setting a surface defect inspection device 20 is provided on a conveying path of the horizontally conveyed strip steel 11 of the high-speed strip cold rolling line 10 .

[0031] Specifically, behind the last pair of rollers 111 (along Figure 1 Between the conveyor rollers (not numbered in the figure) and the conveyor rollers (direction of the arrow in the figure indicates the direction of strip transport), space is reserved for an inspection station 30. As the steel strip 11 passes through the inspection station 30, sufficient space is reserved above and below the steel strip 11 for the placement of cameras and other devices such as the surface defect inspection device 20. This allows the device to capture images of the upper or lower surface of the steel strip 11 directly above or below it, automatically detecting surface defects on the strip 11 through image recognition technology.

[0032] Specifically, in this embodiment, the surface defect detection device 20 includes a guide rail base 21, a C-shaped main frame 22 slidably arranged on the guide rail base 21, a servo drive assembly 23, a detection assembly 24 and a purge air pipe assembly 25.

[0033] The guide rail base 21 is mounted on the ground of the inspection station 30, and a guide rail 212 is provided on the top surface of the guide rail base 21. Figure 2 and Figure 8 The guide rail base 21 includes a detection working section 2111 located below the strip steel 11 and a debugging preparation section 2112 located on the side of the high-speed strip steel cold rolling line 10.

[0034] The direction of the guide rail 212 is parallel to the strip steel 11 and perpendicular to the conveying direction of the strip steel 11. A walking wheel 26 is provided at the bottom of the main frame 22. The servo drive assembly 23 drives the main frame 22 to move along the guide rail 212 on the guide rail base 21, so that the main frame 22 switches between the detection working section 2111 and the debugging preparation section 2112. The detection working section 2111 is located below the strip 11 at the detection station 30, and the debugging preparation section 2112 is located on the side of the high-speed strip cold rolling line 10; when the surface defect detection device 20 is working, the main frame 22 moves to the detection working section 2111; when surface defect detection is no longer needed, the main frame 22 moves to the debugging preparation section 2112, which does not affect other operations of the high-speed strip cold rolling line 10. At the same time, since the cold rolling temperature of the strip 11 is generally 600℃-800℃ when the high-speed strip cold rolling line 10 is working, electronic components such as cameras and light sources are in a high temperature state. Reducing their time in a high temperature environment is beneficial to extending the working life of the electronic components.

[0035] Among them, the main frame 22 includes two straight arms (specifically, an upper straight arm 221 and a lower straight arm 222) arranged along the extension direction of the guide rail base 21 and a connecting arm 223 arranged vertically to connect the two straight arms. The detection component 24 and the purge air pipe component 25 are both arranged on the side of the straight arm facing the strip steel 11.

[0036] Specifically, the detection assembly 24 and the purge air pipe assembly 25 are provided according to the need of surface detection and whether it is necessary to detect the upper surface and the lower surface of the steel strip 11 at the same time.

[0037] In this embodiment, there are two detection assemblies 24 and two purge air pipe assemblies 25, each of which is provided on the two straight arms. It is understood that in other embodiments, the detection assembly 24 and the purge air pipe assembly 25 may be provided on only one straight arm, so that only one surface of the strip 11 is inspected for defects.

[0038] Please combine Figure 2-Figure 5 The detection component 24 includes a camera unit 241 for sampling the surface of the strip steel 11 in the vertical direction, and a light source unit 242 arranged on the side of the camera unit 241 along the conveying direction of the strip steel 11; the camera unit 241 is arranged in the inner cavity 202 of the straight arm, and the light source unit 242 is hung on the side of the straight arm through the bracket 50; the light output direction of the light source unit 242 is inclined 5°-30° toward one side of the camera unit 241.

[0039] Specifically, the detection assembly 24 and the purge air pipe assembly 25 provided on the lower straight arm 222 are used as an example. The camera unit 241 of the detection assembly 24 is provided in the inner cavity 202 of the lower straight arm 222. The camera unit 241 is in the vertical direction, upwardly capturing images, so as to sample the lower surface of the steel strip 11. The light source unit 242 is hung on the side of the straight arm via a bracket 50, and the light emitting direction of the light source unit 242 is tilted 5°-30° toward one side of the camera unit 241, so that the light from the light source unit 242 can illuminate the sampling area of the camera unit 241 at a preferred angle, thereby reducing the inaccuracy of the sampling image caused by lighting problems, thereby reducing the deviation of the detection results.

[0040] Taking the detection assembly 24 and the purge air pipe assembly 25 provided on the upper straight arm 221 as an example, the camera unit 241 of the detection assembly 24 is provided in the inner cavity 202 of the upper straight arm 221. The camera unit 241 captures images downward in the vertical direction to sample the upper surface of the steel strip 11. The light source unit 242 is hung on the side of the straight arm via a bracket 50, and the light emitting direction of the light source unit 242 is tilted 5°-30° toward one side of the camera unit 241, so that the light from the light source unit 242 can illuminate the sampling area of the camera unit 241 at a better angle, thereby reducing the inaccuracy of the sampling image caused by light problems, thereby causing deviations in the detection results.

[0041] Please combine Figure 3-Figure 6 The purge air pipe assembly 25 includes an air pump (not shown) and a first purge air pipe 251 and a second purge air pipe 252 connected to the air pump and arranged along the extension direction of the straight arm; the air outlet of the first purge air pipe 251 blows toward the camera unit 241 to clean the dirt on the lens glass of the camera unit 241; the air outlet of the second purge air pipe 252 blows toward the light source unit 242 to clean the dirt on the light output glass 2421 of the light source unit 242. In order to facilitate the display of the detection assembly 24, Figures 1-9 The purge air pipe assembly 25 provided at the upper straight arm 221 is not shown in the figure; the purge air pipe assembly 25 provided at the lower straight arm 222 is shown in the figure.

[0042] During the rolling process, the surface of the steel strip 11 is at high temperature and is rolled by the rollers, so a lot of oxide dust is produced after oxidation. Therefore, the image of the camera unit 241 is covered with dust, so the fill light of the light source unit 242 is very necessary. At the same time, the presence of a large amount of dust, iron oxide debris, oil and gas and other dirt makes it very easy for dust to accumulate on the surface of the camera unit 241 and the light source unit 242. During the rolling process, the dirt on the lens glass of the camera unit 241 and the dirt on the light output glass 2421 of the light source unit 242 must be blown away in real time.

[0043] Generally speaking, the direction in which the air outlet of the first purge air pipe 251 blows toward the camera unit 241 can be parallel to the surface of the lens glass of the camera unit, or slightly tilted toward the lens glass, so that dirt on the lens glass can be blown away. Similarly, the direction in which the air outlet of the second purge air pipe 252 blows toward the light source unit 242 can be parallel to the surface of the light output glass 2421 of the light source unit 242, or slightly tilted toward the light output glass 2421, so as to blow away dirt on the light output glass 2421 of the light source unit 242.

[0044] Those skilled in the art should know that the C-shaped main frame 22 can be set as an internal hollow structure for routing electrical circuits and other structures of the surface defect detection device 20, such as transmission wires of the detection component 24.

[0045] Those skilled in the art should know that the main innovation of the present invention lies in how to design the overall structure of the surface defect detection device 20, the connection structure of its circuit, the network connection between the detection component 24 and the industrial computer and the background server, etc., which can be set by those skilled in the art as needed.

[0046] Please combine the specific Figure 5-Figure 9 In a preferred embodiment, the light source unit 242 includes a long shell (not numbered in the figure) arranged along the extension direction of the straight arm, a light source (not numbered in the figure) arranged in the shell, and a light-emitting glass 2421 arranged on the light-emitting opening (not numbered in the figure) of the shell; the shell includes a back plate 2422, two side plates arranged opposite to each other, two end plates arranged opposite to each other (not numbered in the figure), and a light-emitting opening. The back plate 2422 is connected to the bracket 50 to fix the light source unit 242 to the straight arm. Among them, the height of the first side plate 2423 away from the camera unit 241 is greater than the height of the second side plate 2424 close to the camera unit 241. Therefore, the plane where the light-emitting opening is located forms an angle with the horizontal plane, so that the light-emitting direction of the light source unit 242 is tilted 5°-30° toward one side of the camera unit 241. By making the plane where the light output opening of the light source unit 242 arranged on the side of the camera unit 241 is located form an angle with the horizontal plane, the light output direction of the light source unit 242 is adjusted so that the center of the light emitted by the light source is basically concentrated on the center point of the image captured by the camera unit 241, thereby improving the quality of the captured image.

[0047] Preferably, in this embodiment, the light source unit 242 on the lower straight arm 222 is located on the first side of the camera unit 241, and the light source unit 242 on the upper straight arm 221 is located on the second side of the camera unit 241, and the first side and the second side are two different directions along the conveying direction of the strip steel 11.

[0048] Preferably, in a preferred improvement of this embodiment, the first purge air pipe 251 is disposed on the side adjacent to the camera unit 241 and the light source unit 242, and the second purge air pipe 252 is disposed on the side of the first side plate 2423 away from the camera unit 241 and close to the light exit glass. Since the light source unit 242 on the lower straight arm 222 is located on the first side of the camera unit 241, and the light source unit 242 on the upper straight arm 221 is located on the second side of the camera unit 241, the upper and lower first purge air pipes 251 and second purge air pipes 252 have opposite blowing directions, thereby preventing the generation of unidirectional airflow that would cause dirt to be rolled back and degrade the shooting conditions.

[0049] In this embodiment, the first side is the same direction as the conveying direction of the steel strip 11 , and the second side is the opposite direction to the conveying direction of the steel strip 11 .

[0050] Preferably, since the operating temperature of the high-speed strip cold rolling line is 600° C.-800° C., the first purge air pipe 251 and the second purge air pipe 252 are glass tubes.

[0051] In this embodiment, as mentioned above, the C-shaped main frame 22 may be a hollow structure for routing electrical circuits and other structures of the surface defect detection device 20 , such as transmission wires of the detection component 24 .

[0052] In the upper straight arm 221 and the lower straight arm 222, along the extension direction of the straight arm, the detection component 24 includes multiple light source units 242 and camera units 241 arranged along the extension direction of the straight arm. Generally speaking, the image acquisition area of a camera unit 241 is fixed. When the width of the strip 11 is relatively large, a camera unit 241 cannot cover the entire surface image of the strip 11 in width. In this case, multiple camera units 241 can be arranged along the extension direction of the straight arm. For example, please combine Figure 9 The inner cavity 202 of the straight arm is divided into three installation chambers 2021 by a partition with a middle wire hole, and one camera unit 241 is set in each installation chamber 2021.

[0053] Similarly, the number of light source units 242 matching the camera unit 241 may also be multiple.

[0054] In a preferred embodiment, the light source unit 242 is configured as a long strip of light source. Only one light source unit 242 needs to be provided to ensure that the length of the light source unit 242 is greater than the total length of multiple camera units 241, so that the light emitted by the light source unit 242 can illuminate the image acquisition area of each camera unit 241.

[0055] In another preferred embodiment, the length of the purge air pipe assembly 25 in the extension direction of the straight arm is greater than the length of the detection assembly 24 in the extension direction of the straight arm, so as to ensure that all positions of the detection assembly 24 are purged.

[0056] Preferably, in this embodiment, the guide rail base 21 includes a guide rail 212, a deck 213 parallel to and located below the guide rail 212, and a plurality of support columns 214 supporting the guide rail 212 and the deck 213. The electrical connection lines of the servo drive assembly 23, the detection assembly 24, and the purge air pipe assembly 25 are connected to an external power supply and controller via a drag chain 27, which is placed on the deck 213. The electrical connection lines can extend from the drag chain 27 to the interior of the main frame 22 to connect to various electrical components, such as the solenoid valves of the servo drive assembly 23, the detection assembly 24, and the purge air pipe assembly 25.

[0057] In this embodiment, the servo driver 23 is in transmission connection with at least one running wheel 26 to drive the running wheel 26 to move on the guide rail 212. Alternatively, in other embodiments, the servo driver 23 may directly drive the main frame 22 via the running wheel 26 by means of a push rod, so that the main frame 22 moves on the guide rail 212. Those skilled in the art may configure the configuration as needed.

[0058] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0059] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0060] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0061] In the description of this specification, the terms "one embodiment", "some embodiments", "embodiments", "examples", "specific examples" or "some examples" refer to the specific features, structures, materials or characteristics described in conjunction with the embodiment or example and included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0062] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A surface defect detection device for a high-speed cold-rolling steel strip line based on machine vision recognition, wherein a detection station for the surface defect detection device is provided on a horizontal strip conveying path of the high-speed cold-rolling steel strip line, characterized in that: The surface defect detection device includes a guide rail base, a C-shaped main frame slidably arranged on the guide rail base, a servo drive component, a detection component and a purge air pipe component; wherein, The guide rail base is mounted on the ground of the inspection station, and a guide rail is provided on the top surface of the guide rail base. The guide rail base includes an inspection working section located below the strip steel and a debugging preparation section located on the side of the high-speed strip steel cold rolling line. The direction of the guide rail is parallel to the strip steel and perpendicular to the conveying direction of the strip steel. The bottom of the main frame is provided with a walking wheel, and the servo drive assembly drives the main frame to move along the guide rail on the guide rail base, so that the main frame switches between the inspection working section and the debugging preparation section. The main frame includes two upper and lower straight arms arranged along the extension direction of the guide rail base and a vertical connecting arm connecting the two straight arms, and the detection assembly and the purge air pipe assembly are both arranged on the side of the straight arm facing the strip steel; The detection assembly includes a camera unit for sampling the surface of the steel strip in a vertical direction, and a light source unit arranged on the side of the camera unit along the conveying direction of the steel strip; the camera unit is arranged in the inner cavity of the straight arm, and the light source unit is hung on the side of the straight arm through a bracket; the light output direction of the light source unit is inclined by 5°-30° toward one side of the camera unit; The purge air pipe assembly includes an air pump and a first purge air pipe and a second purge air pipe connected to the air pump and arranged along the extension direction of the straight arm; the air port of the first purge air pipe blows toward the camera unit to purge dirt on the lens glass of the camera unit; the air port of the second purge air pipe blows toward the light source unit to purge dirt on the light output glass of the light source unit.

2. The surface defect detection device according to claim 1, characterized in that: There are two detection components and two purge air pipe components, which are respectively arranged on the two straight arms.

3. The surface defect detection device according to claim 2, characterized in that: The light source unit on the lower straight arm is located on the first side of the camera unit, and the light source unit on the upper straight arm is located on the second side of the camera unit. The first side and the second side are two different directions along the conveying direction of the strip.

4. The surface defect detection device according to claim 3, characterized in that: The first side is in the same direction as the conveying direction of the steel strip, and the second side is in the opposite direction to the conveying direction of the steel strip.

5. The surface defect detection device according to claim 1, wherein: The light source unit includes a long strip of shell arranged along the extension direction of the straight arm, a light source arranged in the shell and a light-emitting glass arranged on the light-emitting opening of the shell; the shell includes a back plate, two oppositely arranged side plates, two oppositely arranged end plates and the light-emitting opening; the back plate is connected to the bracket to fix the light source unit to the straight arm; the height of the first side plate away from the camera unit is greater than the height of the second side plate close to the camera unit, and the plane where the light-emitting opening is located forms an angle with the horizontal plane, so that the light-emitting direction of the light source unit is inclined 5°-30° toward one side of the camera unit.

6. The surface defect detection device according to claim 5, characterized in that: The first purge air pipe is arranged on the side adjacent to the camera unit and the light source unit, and the second purge air pipe is arranged on the side close to the light output glass of the first side plate away from the camera unit; the first purge air pipe and the second purge air pipe are high-temperature resistant glass tubes.

7. The surface defect detection device according to any one of claims 1 to 6, characterized in that: The detection assembly includes a plurality of light sources and cameras arranged along the extension direction of the straight arm; the length of the purge air pipe assembly in the extension direction of the straight arm is greater than the length of the detection assembly in the extension direction of the straight arm.

8. The surface defect detection device according to any one of claims 1 to 6, characterized in that: It also includes a cooling component for cooling the detection component.

9. The surface defect detection device according to any one of claims 1 to 6, characterized in that: The guide rail base includes the guide rail, a shelf parallel to the guide rail and located below the guide rail, and multiple support columns supporting the guide rail and the shelf; the electrical connection lines of the servo drive assembly, detection assembly and purge air pipe assembly are connected to an external power supply and controller through a drag chain, and the drag chain is placed on the shelf.

10. The surface defect detection device according to any one of claims 1 to 6, characterized in that: The servo drive is in transmission connection with at least one of the travel wheels to drive the travel wheel to move on the guide rail.

Images