Device for detecting surface defects of steel coil
By installing an image acquisition and detection module at the raw material inlet of the cold rolling line, surface defects of steel coils can be automatically detected, solving the problem of low efficiency in manual inspection, achieving efficient and accurate defect identification, and improving production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2026-03-10
AI Technical Summary
In existing technologies, the detection of surface defects in steel coils relies on manual visual inspection, which leads to low efficiency and makes it difficult to guarantee the consistency and accuracy of the detection results.
A frame is installed across the raw material inlet of the cold rolling line, and an image acquisition module, a strip steel detection module, and a control module are installed. The imaging equipment acquires images of the strip steel surface and performs identification and judgment, replacing manual visual inspection.
This improves the efficiency of strip steel surface defect inspection, ensures the consistency and accuracy of inspection, and thus enhances the production efficiency of the production line.
Smart Images
Figure CN223986054U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the strip production technical field especially, and it is a kind of detection device for steel coil surface defect. BACKGROUND
[0002] In the strip production process, the quality detection of the surface of the steel coil is a crucial link. The surface defects of the steel coil not only affect the appearance of the product, but also can have a significant impact on the structural strength and performance of the product.
[0003] In the prior art, the detection of the surface defects of the steel coil mainly relies on manual visual inspection. This method relies on the personal experience and subjective judgment of the inspector, and not only is inefficient, but also due to human factors, the consistency and accuracy of the detection results are difficult to guarantee.
[0004] Therefore, a new scheme is needed to solve the above technical problems. SUMMARY
[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a detection device for the surface defects of the steel coil, to solve the problem of low production efficiency of the production line caused by the detection of the surface defects of the steel coil in the prior art.
[0006] To achieve the above-mentioned purposes and other related purposes, the utility model provides a detection device for the surface defects of the steel coil, which is specifically configured as follows: a rack is arranged across the raw material inlet end of the cold rolling line, and an image acquisition module, a strip detection module and a control module are connected to the rack, wherein the image acquisition module and the strip detection module are located above the cold rolling line and are electrically connected to the control module; the image acquisition module includes an imaging device for shooting the surface image of the uncoiled strip; the strip detection module is used to detect whether there is a strip in the shooting area of the imaging device, and when the strip detection module detects the strip, the control module starts the image acquisition module to acquire the surface image of the strip, and determines the surface defects of the strip according to the surface image of the strip.
[0007] Optionally, the detection device further comprises a temperature detection module and a cooling module electrically connected to the control module, the temperature detection module is used to detect the real-time temperature of the image acquisition module and the strip detection module, and the control module adjusts the cooling efficiency of the cooling module on the image acquisition module and the strip detection module according to the real-time temperature.
[0008] Optionally, the strip detection module comprises a speed sensor, and the speed sensor is used to detect the moving speed of the strip to determine the position of the surface defects of the strip.
[0009] Optionally, the image acquisition module further comprises a first adjusting mechanism and a light source connected to a movable end of the first adjusting mechanism, the first adjusting mechanism being configured to adjust an illumination angle of the light source and / or to move the light source closer to or farther away from the strip steel, the light source providing illumination when the imaging device captures the surface image of the strip steel.
[0010] Optionally, the temperature detection module comprises a first temperature sensor, a second temperature sensor and a third temperature sensor, the first temperature sensor being configured to detect a real-time temperature of the imaging device, the second temperature sensor being configured to detect a real-time temperature of the light source, and the third temperature sensor being configured to detect a real-time temperature of the speed sensor.
[0011] Optionally, the rack comprises a protective cover, an opening being formed on a side of the protective cover facing the strip steel, and the image acquisition module and the strip steel detection module are arranged in the protective cover; the cooling module comprises an air cooling mechanism and / or a water cooling mechanism to cool the image acquisition module and the strip steel detection module.
[0012] Optionally, the imaging device is a line-scan camera; the image acquisition module further comprises a protective shell, the line-scan camera being arranged in the protective shell, a view window being formed on a side of the protective shell facing the strip steel, and a shooting surface of the line-scan camera being arranged opposite to the view window and capturing the surface image of the strip steel through the view window.
[0013] Optionally, the image acquisition module further comprises a blowing mechanism arranged below the view window, the blowing mechanism comprising an air knife, the air knife extending along a cross direction of the rack and continuously blowing air along a conveying direction of the strip steel.
[0014] Optionally, the image acquisition module further comprises a second adjusting mechanism, a movable end of the second adjusting mechanism being connected to the protective shell to move the imaging device closer to or farther away from the strip steel and / or to move the imaging device along the cross direction of the rack.
[0015] Optionally, the line-scan camera, the air knife and the second adjusting mechanism are each provided with more than one and are arranged one-to-one; a plurality of the line-scan cameras are arranged at intervals along the cross direction of the rack, and scanning lines of the plurality of line-scan cameras are on a straight line.
[0016] As described above, the detection device for surface defects of a steel coil has the following beneficial effects:
[0017] By setting up a rack at the raw material inlet end of the cold rolling line, and setting up an image acquisition module, a strip steel detection module and a control module on the rack, wherein the image acquisition module and the strip steel detection module are located above the cold rolling line and are electrically connected with the control module, when the strip steel detection module detects that there is strip steel passing through the shooting area of the imaging equipment of the image acquisition module, the control module starts the imaging equipment to collect the surface image of the strip steel, and identifies the collected image to realize the confirmation of the surface defects of the strip steel, thereby replacing manual visual inspection, which is conducive to improving the efficiency of the strip steel surface defect inspection, and further conducive to improving the production efficiency of the production line, and also conducive to ensuring the consistency and accuracy of the strip steel surface defect inspection. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 A structure schematic diagram of a detection device for steel coil surface defects is shown in the embodiment of the present application.
[0019] Figure 2 A partial structure schematic diagram is shown in the embodiment of the present application. Figure 1
[0020] A first partial structure schematic diagram is shown in the embodiment of the present application. Figure 3 Figure 2 A second partial structure schematic diagram is shown in the embodiment of the present application.
[0021] Figure 4 A second partial structure schematic diagram is shown in the embodiment of the present application. Figure 2
[0022] A second partial structure schematic diagram is shown in the embodiment of the present application. Figure 5 Figure 4 A partial structure schematic diagram is shown in the embodiment of the present application.
[0023] BRIEF DESCRIPTION OF DRAWINGS
[0024] 1-rack; 11-bracket; 12-protective cover; 121-opening;
[0025] 2-image acquisition module; 21-imaging equipment; 22-first adjusting mechanism; 221-first connecting plate; 222-second connecting plate; 223-positioning screw; 224-positioning block; 23-light source; 24-protective shell; 241-window; 25-second adjusting mechanism; 251-third connecting plate; 252-linear module; 26-air knife;
[0026] 3-strip steel detection module; 31-speed sensor;
[0027] 4-control module;
[0028] 5-cooling module; 51-air cooling mechanism; 52-water cooling mechanism. DETAILED DESCRIPTION
[0029] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.
[0030] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the illustrations only show components relevant to this utility model and are not drawn according to the actual number, shape, and size of the components in implementation. In actual implementation, the shape, quantity, and proportion of each component can be arbitrarily changed, and the component layout may be more complex. The structures, proportions, and sizes shown in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.
[0031] like Figures 1 to 5 As shown, some embodiments of this application provide a detection device for surface defects in steel coils, including a frame 1 spanning the raw material inlet end of a cold rolling line, i.e., the frame 1 spans the width direction of the unfolded strip of the steel coil. An image acquisition module 2, a strip detection module 3, and a control module 4 are mounted on the frame 1, wherein the image acquisition module 2 and the strip detection module 3 are both located above the cold rolling line, i.e., above the strip, and are electrically connected to the control module 4.
[0032] Image acquisition module 2 includes imaging device 21, which is used to capture surface images of the strip steel. Strip steel detection module 3 is used to detect whether there is strip steel in the imaging area of imaging device 21. When strip steel detection module 3 detects strip steel in the imaging area of imaging device 21, control module 4 activates image acquisition module 2 to acquire surface images of the strip steel through imaging device 21. After control module 4 acquires the surface image of the strip steel, it identifies and judges the image to determine surface defects of the strip steel, thereby replacing manual visual inspection, which helps to improve the efficiency of strip steel surface defect inspection, thus improving the production efficiency of the production line, and also helps to ensure the consistency and accuracy of strip steel surface defect inspection.
[0033] For example, the imaging device 21 may include, but is not limited to, a line scan camera, an area scan camera, etc.
[0034] In some embodiments, the image acquisition module 2 further includes a first adjustment mechanism 22 and a light source 23, the light source 23 being mounted on the movable end of the first adjustment mechanism 22. The first adjustment mechanism 22 adjusts the angle of the light rays from the light source 23 onto the strip, or adjusts the relative distance between the light source 23 and the strip, or adjusts the angle of the light rays from the light source 23 onto the strip and the relative distance between the light source 23 and the strip, so that the light source 23 can provide illumination for the imaging device 21 to capture images of the strip surface, thereby improving the imaging clarity of the imaging device 21. It should be noted that the illumination range of the light source 23 can cover the width direction of the strip.
[0035] For example, in order to avoid the influence of ambient light intensity on the imaging sharpness of imaging device 21, the light intensity of light source 23 can be set to 10000 Lux.
[0036] In one example, the first adjustment mechanism 22 includes a first connecting plate 221, a second connecting plate 222, a positioning screw 223, and a positioning block 224. The first connecting plate 221 is mounted on a bracket 11 of the frame 1. The bracket 11 has a first strip hole through which the distance between the first connecting plate 221 and the strip can be adjusted. The positioning block 224 is screwed onto the first connecting plate 221. After the distance between the first connecting plate 221 and the strip is adjusted, the positioning screw 223 passes through the bracket 11 and connects to the positioning block 224, thereby fixing the first connecting plate 221 onto the bracket 11. The first connecting plate 221 has an arc-shaped hole through which the second connecting plate 222 connects to the first connecting plate 221, allowing the second connecting plate 222 to rotate relative to the first connecting plate 221. A light source 23 is mounted on the second connecting plate 222, and the illumination angle of the light source 23 can be adjusted by rotating the second connecting plate 222.
[0037] In some embodiments, the imaging device 21 is configured as a line scan camera. To prevent the high dust environment of the cold rolling line from affecting the normal operation of the line scan camera, the image acquisition module 2 also includes a protective housing 24, in which the line scan camera is installed. A viewing window 241 is provided on the side of the protective housing 24 facing the strip, and the imaging surface of the line scan camera is positioned opposite to the viewing window 241, through which the surface image of the strip is captured.
[0038] For example, the viewing window 241 is made of a transparent material, such as glass, to ensure that the line scanner can capture surface images of the strip steel through the viewing window 241. To ensure that the line scanner is in a closed environment, the protection rating of the protective housing 24 can be set to IP65.
[0039] In some embodiments, the image acquisition module 2 further includes a second adjustment mechanism 25. The movable end of the second adjustment mechanism 25 is connected to a protective shell 24, and an imaging device 21 is installed inside the protective shell 24. This allows the second adjustment mechanism 25 to move the imaging device 21 closer to or away from the strip steel, or to move the imaging device 21 along the spanning direction of the frame 1, or to move the imaging device 21 closer to or away from the strip steel and to move the imaging device 21 along the spanning direction of the frame 1, so that the imaging range of the imaging device 21 can completely cover the width direction of the strip steel.
[0040] In one example, the second adjustment mechanism 25 includes a third connecting plate 251 and a linear module 252. The third connecting plate 251 has a second slotted hole, through which it is mounted on the inner wall of the protective cover 12 of the frame 1. The second slotted hole allows adjustment of the position of the third connecting plate 251 in the spanning direction of the frame 1, i.e., adjusting the relative position of the third connecting plate 251 with respect to the width direction of the strip. The linear module 252 is connected to the third connecting plate 251, and a protective shell 24 is mounted on the drive end of the linear module 252. The linear module 252 drives the protective shell 24 to move closer to or away from the strip.
[0041] In some embodiments, the image acquisition module 2 further includes a blowing mechanism located below the viewing window 241 to disperse dust located below the viewing window 241. This helps reduce the impact of dust on the image clarity of the line scan camera and also helps prevent the line scan camera from capturing dust into the image of the strip surface, thereby avoiding subsequent misjudgments of strip surface defects and improving the accuracy of strip surface defect judgment. The blowing mechanism includes an air knife 26, which extends along the spanning direction of the frame 1 and continuously blows air along the strip conveying direction to disperse dust.
[0042] In some embodiments, one or more line scan cameras are provided. The number of line scan cameras can be one, two, three, etc., and the specific number is adapted to the shooting range of the line scan cameras and the width of the strip steel. One or more second adjustment mechanisms 25 and air knives 26 are also provided. The number of second adjustment mechanisms 25 and air knives 26 corresponds one-to-one with the number of line scan cameras, so that each line scan camera is equipped with one air knife 26 and one second adjustment mechanism 25. This ensures that each line scan camera has an air knife 26 blowing away dust in front of its shooting face, and allows for individual control of each line scan camera, which improves the flexibility of line scan camera adjustment.
[0043] Multiple line scan cameras are spaced apart along the spanning direction of the frame 1, ensuring that the imaging range of the multiple line scan cameras can completely cover the width of the strip, which helps to improve the image acquisition speed and thus realize real-time detection of the strip. Furthermore, the scan lines of the multiple line scan cameras remain in a straight line, which helps to improve the overall accuracy of the stitched images.
[0044] In one example, the strip detection module 3 includes a photoelectric sensor that detects whether there is strip in the imaging area of the imaging device 21.
[0045] In another example, the strip detection module 3 includes a speed sensor 31, which detects the moving speed of the strip. When the speed sensor 31 detects a moving speed greater than 0, it indicates that there is strip in the imaging area of the imaging device 21, and the control module 4 activates the imaging device 21 to acquire a surface image of the strip. Furthermore, by convolving the detected moving speed of the strip, the length information of the strip can be obtained. When the control module 4 identifies and judges the acquired image and discovers surface defects in the strip, it can determine the specific location of the surface defects on the strip for subsequent operations.
[0046] For example, the speed sensor 31 can be configured as a Doppler laser velocimeter, etc.
[0047] In some embodiments, the control module 4 is also electrically connected to a temperature detection module and a cooling module 5. The temperature detection module detects the real-time temperature of the image acquisition module 2 and the strip detection module 3. Based on the real-time temperature, the control module 4 adjusts the cooling efficiency of the cooling module 5 on the image acquisition module 2 and the strip detection module 3, thereby maintaining the temperature of the image acquisition module 2 and the strip detection module 3 within their normal operating temperature range to ensure their normal operation.
[0048] In one example, the temperature detection module includes a first temperature sensor, a second temperature sensor, and a third temperature sensor. The first temperature sensor is mounted on the imaging device 21 to detect the real-time temperature of the imaging device 21 and upload this real-time temperature to the control module 4. The second temperature sensor is mounted on the light source 23 to detect the real-time temperature of the light source 23 and upload this real-time temperature to the control module 4. The third temperature sensor is mounted on the speed sensor 3 to detect the real-time temperature of the speed sensor 3 and upload this real-time temperature to the control module 4.
[0049] For example, the first temperature sensor is a temperature sensor built into the imaging device 21, the second temperature sensor is a temperature sensor configured for the light source 23, and the third temperature sensor is a temperature sensor configured for the speed sensor 31.
[0050] In one example, the frame 1 includes a protective cover 12, inside which the image acquisition module 2 and the strip detection module 3 are installed. This isolates the image acquisition module 2 and the strip detection module 3 from the high-temperature and high-dust environment, thus improving their service life. The protective cover 12 has an opening 121 on the side facing the strip. This opening 121 allows the image acquisition module 2 to acquire surface images of the strip, the strip detection module 3 to detect the presence of strip in the imaging area of the imaging device 21, and the light source 23 to avoid illuminating the strip. In other words, the imaging device 21 can capture surface images of the strip through this opening 121, the speed sensor 31 can detect the strip through this opening 121, and the light emitted by the light source 23 passes through this opening 121 and illuminates the strip.
[0051] The cooling module 5 includes an air-cooling mechanism 51 and a water-cooling mechanism 52, or the cooling module 5 includes either an air-cooling mechanism 51 or a water-cooling mechanism 52, to cool the image acquisition module 2 and the strip steel detection module 3 located inside the protective cover 12. Cooling the image acquisition module 2 and the strip steel detection module 3 through the cooling module 5 helps ensure the normal operation of the image acquisition module 2 and the strip steel detection module 3, and also helps to extend the service life of the image acquisition module 2 and the strip steel detection module 3.
[0052] For example, the air-cooling mechanism 51 is used to accelerate the airflow speed inside the protective cover 12, so as to reduce the internal temperature of the protective cover 12. The air-cooling mechanism 51 includes, but is not limited to, a fan, a combination of a fan and a heat sink, etc.
[0053] The water cooling mechanism 52 includes a cooling pipe that is wound around the housing of the imaging device 21, the light source 23 and the speed sensor 31, and is filled with cooling water to cool the imaging device 21, the light source 23 and the speed sensor 31.
[0054] For example, the air knife 26 is installed at the opening 121 of the protective cover 12, which helps to prevent dust from the outside of the protective cover 12 from entering the protective cover 12.
[0055] In summary, the present invention provides a detection device for surface defects in steel coils. This device involves installing a frame across the raw material inlet of a cold rolling line, and assembling an image acquisition module, a strip steel detection module, and a control module on this frame. The image acquisition module and the strip steel detection module are located above the cold rolling line and electrically connected to the control module. When the strip steel detection module detects strip steel passing through the imaging area of the image acquisition module, the control module activates the imaging device to acquire a surface image of the strip steel. The acquired image is then identified and judged to confirm surface defects in the strip steel, thus replacing manual visual inspection. This improves the efficiency of strip steel surface defect inspection, thereby increasing production line efficiency and ensuring the consistency and accuracy of strip steel surface defect inspection.
[0056] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.
Claims
1. A device for detecting surface defects of a steel coil, characterized by, The application relates to a surface defect detection device for cold-rolled strip steel. The device comprises a rack, which is arranged at the raw material inlet end of a cold rolling line; an image acquisition module, which is connected to the rack and located above the cold rolling line, and comprises an imaging device for shooting the surface image of the uncoiled strip steel; a strip steel detection module, which is connected to the rack and located above the cold rolling line, and is used for detecting whether there is strip steel in the shooting area of the imaging device; and a control module, which is connected to the rack and electrically connected to the image acquisition module and the strip steel detection module, and is used for starting the image acquisition module to acquire the surface image of the strip steel and determining the surface defects of the strip steel according to the surface image of the strip steel when the strip steel detection module detects the strip steel. The detection device further comprises a temperature detection module and a cooling module, which are electrically connected to the control module, the temperature detection module is used for detecting the real-time temperature of the image acquisition module and the strip steel detection module, and the control module adjusts the cooling efficiency of the cooling module on the image acquisition module and the strip steel detection module according to the real-time temperature. The strip steel detection module comprises a speed measurement sensor, which is used for detecting the moving speed of the strip steel to determine the position of the surface defects of the strip steel. The image acquisition module further comprises a first adjusting mechanism and a light source connected to the movable end of the first adjusting mechanism, the first adjusting mechanism is used for adjusting the irradiation angle of the light source and / or driving the light source to approach or move away from the strip steel, and the light source provides illumination when the imaging device shoots the surface image of the strip steel.
2. The apparatus for detecting surface defects of a steel coil according to claim 1, characterized by: The temperature detection module comprises a first temperature sensor, a second temperature sensor and a third temperature sensor, the first temperature sensor is used for detecting the real-time temperature of the imaging device, the second temperature sensor is used for detecting the real-time temperature of the light source, and the third temperature sensor is used for detecting the real-time temperature of the speed measurement sensor.
3. The apparatus for detecting surface defects of a steel coil according to claim 2, characterized by: The rack comprises a protective cover, one side of the protective cover is provided with an opening, and the image acquisition module and the strip steel detection module are arranged in the protective cover; and the cooling module comprises an air cooling mechanism and / or a water cooling mechanism to cool the image acquisition module and the strip steel detection module.
4. The apparatus for detecting surface defects of a steel coil according to claim 3, characterized by: The imaging device is arranged as a line-scan camera; the image acquisition module further comprises a protective shell, the line-scan camera is arranged in the protective shell, one side of the protective shell is provided with a window, the shooting surface of the line-scan camera is arranged opposite to the window, and the line-scan camera shoots the surface image of the strip steel through the window.
5. The apparatus for detecting surface defects of a steel coil according to claim 4, characterized by: The image acquisition module further comprises a blowing mechanism located below the window, the blowing mechanism comprises an air knife, the air knife extends along the arrangement direction of the rack and continuously blows air along the conveying direction of the strip steel.
6. The apparatus for detecting surface defects of a steel coil according to claim 2, wherein: The image acquisition module further comprises a second adjusting mechanism, the movable end of the second adjusting mechanism is connected with the protective shell to drive the imaging device to approach or move away from the strip steel and / or drive the imaging device to move along the arrangement direction of the rack.
7. The apparatus for detecting surface defects of a steel coil according to any one of claims 1 to 6, characterized by: 8. The apparatus for detecting surface defects of a steel coil according to claim 7, characterized by: 9. The apparatus for detecting surface defects of a steel coil according to claim 8, characterized by: 10. The apparatus for detecting surface defects of a steel coil according to claim 9, wherein: The line-scan camera, the air knife and the second adjusting mechanism are provided with more than one, and one-to-one correspondence; multiple line-scan cameras are arranged along the cross direction of the rack, and the scanning lines of multiple line-scan cameras are on a straight line.