Detection device for steel coil surface defects and strip surface image acquisition method

Abstract

The present invention provides a detection device for steel coil surface defects and a strip steel surface image acquisition method, which belong to the field of strip steel production technology. The detection device of the present invention includes a frame arranged across the raw material inlet end of the cold rolling line, and an image acquisition module, a strip steel detection module and a control module connected to the frame, wherein the image acquisition module and the strip steel 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 capturing the surface image of the strip steel unrolled from the steel coil; the strip steel detection module is used to detect whether there is a strip steel in the shooting area of ​​the imaging device, and when the strip steel detection module detects the strip steel, the control module turns on the image acquisition module to capture the surface image of the strip steel and determine the surface defects of the strip steel. The present invention is conducive to improving the efficiency of strip steel surface defect inspection, and thus is conducive to improving the production efficiency of the production line.

Description

Technical Field

[0001] The invention relates to the field of strip steel production, and in particular to a device for detecting surface defects of a steel coil and a method for collecting surface images of the strip steel. Background Art

[0002] In the strip steel production process, the quality inspection of the steel coil surface is a crucial link. The surface defects of the steel coil not only affect the appearance of the product, but also may have a significant impact on the structural strength and performance of the product.

[0003] In the prior art, the detection of surface defects of steel coils mainly relies on manual visual inspection. This method relies on the personal experience and subjective judgment of the inspector, which is not only inefficient, but also difficult to ensure the consistency and accuracy of the detection results due to human factors.

[0004] Therefore, a new solution is needed to solve the above technical problems. Summary of the invention

[0005] In view of the shortcomings of the prior art described above, an object of the present invention is to provide a device for detecting surface defects of steel coils and a method for acquiring surface images of strip steel, so as to solve the problem of low production efficiency of production lines caused by surface defect detection of steel coils in the prior art.

[0006] To achieve the above-mentioned purpose and other related purposes, the present invention provides a detection device for surface defects of steel coils, which is specifically configured as follows: it includes a frame arranged across the raw material inlet end of a cold rolling line, and an image acquisition module, a strip steel detection module and a control module connected to the frame, wherein the image acquisition module and the strip steel 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 capturing a surface image of the strip steel unrolled from the steel coil; the strip steel detection module is used to detect whether there is a strip steel in the capturing area of ​​the imaging device, and when the strip steel detection module detects the strip steel, the control module turns on the image acquisition module to capture the surface image of the strip steel, and determines the surface defects of the strip steel based on the surface image of the strip steel.

[0007] Optionally, the detection device also includes 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 steel detection module includes a speed sensor, and the speed sensor is used to detect the moving speed of the strip steel to determine the position of the surface defect of the strip steel.

[0009] Optionally, the image acquisition module also includes a first adjustment mechanism and a light source connected to the active end of the first adjustment mechanism, the first adjustment mechanism is used to adjust the illumination angle of the light source, and / or drive the light source to approach or move away from the strip, and the light source provides illumination for the imaging device to capture the surface image of the strip.

[0010] Optionally, the temperature detection module includes a first temperature sensor, a second temperature sensor and a third temperature sensor, the first temperature sensor is used to detect the real-time temperature of the imaging device, the second temperature sensor is used to detect the real-time temperature of the light source, and the third temperature sensor is used to detect the real-time temperature of the speed sensor.

[0011] Optionally, the frame includes a protective cover having an opening on a side of the protective cover facing the strip steel, and the image acquisition module and the strip steel detection module are both arranged in the protective cover; the cooling module includes 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 configured as a line scan camera; the image acquisition module also includes a protective shell, the line scan camera is arranged in the protective shell, a window is provided on the side of the protective shell facing the strip, the shooting surface of the line scan camera is arranged opposite to the window, and the surface image of the strip is captured through the window.

[0013] Optionally, the image acquisition module also includes a second adjustment mechanism and a purge mechanism located below the window, the movable end of the second adjustment mechanism is connected to the protective shell to drive the imaging device to approach or move away from the strip, and / or drive the imaging device to move along the cross-set direction of the frame; the purge mechanism includes an air knife, which extends along the cross-set direction of the frame and continuously blows air along the conveying direction of the strip.

[0014] Optionally, there are more than one line scan camera, the air knife and the second adjustment mechanism, and the three are arranged in a one-to-one correspondence; the multiple line scan cameras are arranged at intervals along the span direction of the frame, and the scanning lines of the multiple line scan cameras are on a straight line.

[0015] The present invention also provides a strip surface image acquisition method, which is applied to any of the above-mentioned devices for detecting surface defects of steel coils, and the method comprises:

[0016] Real-time acquisition of the strip steel condition within the imaging range of the image acquisition module, wherein the strip steel condition includes whether the strip steel passes through or not;

[0017] After confirming that the steel strip has passed through, the surface image of the steel strip is acquired by the imaging device of the image acquisition module.

[0018] Optionally, the method further comprises:

[0019] Acquire a first real-time temperature of the imaging device, a second real-time temperature of the light source of the image acquisition module, and a third real-time temperature of the speed sensor of the strip detection module;

[0020] The cooling efficiency of the cooling module is adjusted according to the first real-time temperature, the second real-time temperature and the third real-time temperature.

[0021] As described above, the device for detecting surface defects of a steel coil and the method for collecting surface images of a steel strip of the present invention have the following beneficial effects:

[0022] A frame is installed across the raw material inlet end of the cold rolling line, and an image acquisition module, a strip steel detection module and a control module are arranged on the frame, wherein the image acquisition module and the strip steel detection module are located above the cold rolling line and are electrically connected to the control module. When the strip steel detection module detects that a strip steel passes through the shooting area of ​​the imaging device of the image acquisition module, the control module turns on the imaging device to acquire the surface image of the strip steel, and identifies and judges the acquired image to confirm the surface defects of the strip steel, thereby replacing manual visual inspection, which is beneficial to improving the efficiency of strip steel surface defect inspection, and then beneficial to improving the production efficiency of the production line, and also beneficial to ensuring the consistency and accuracy of strip steel surface defect inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a device for detecting surface defects of a steel coil according to an embodiment of the present invention;

[0024] Figure 2 Display as Figure 1 Schematic diagram of the local structure;

[0025] Figure 3 Display as Figure 2 A first partial structural schematic diagram of;

[0026] Figure 4 Display as Figure 2 A second partial structural schematic diagram;

[0027] Figure 5 Display as Figure 4 Schematic diagram of the local structure.

[0028] Description of Reference Numerals

[0029] 1-frame; 11-bracket; 12-protective cover; 121-opening;

[0030] 2-image acquisition module; 21-imaging device; 22-first adjustment 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 adjustment mechanism; 251-third connecting plate; 252-linear module; 26-air knife;

[0031] 3-strip steel detection module; 31-speed sensor;

[0032] 4- Control module;

[0033] 5-cooling module; 51-air cooling mechanism; 52-water cooling mechanism. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0035] It should be noted that the diagram provided in the present embodiment only illustrates the basic concept of the present invention in a schematic manner, so the diagram only shows the components related to the present invention rather than drawing according to the number, shape and size of the components during actual implementation. The form, quantity and proportion of each component during actual implementation can be changed at will, and the component layout form may also be more complicated. The structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that the present invention can be implemented, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effect that the present invention can produce and the purpose that can be achieved. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of narration, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0036] See also Figures 1 to 5The present invention provides a device for detecting surface defects of steel coils, comprising a frame 1 straddling the raw material inlet end of a cold rolling line, that is, the frame 1 straddling the width direction of the steel strip unrolled from the steel coil. The frame 1 is equipped with an image acquisition module 2, a steel strip detection module 3 and a control module 4, wherein the image acquisition module 2 and the steel strip detection module 3 are both located above the cold rolling line, that is, above the steel strip, and are electrically connected to the control module 4.

[0037] The image acquisition module 2 includes an imaging device 21, which is used to capture the surface image of the steel strip. The steel strip detection module 3 is used to detect whether there is a steel strip in the shooting area of ​​the imaging device 21. When the steel strip detection module 3 detects that there is a steel strip in the shooting area of ​​the imaging device 21, the control module 4 turns on the image acquisition module 2 to capture the surface image of the steel strip through the imaging device 21. After the control module 4 obtains the surface image of the steel strip, it identifies and judges the image to determine the surface defects of the steel strip, thereby replacing manual visual inspection, which is conducive to improving the efficiency of the steel strip surface defect inspection, thereby improving the production efficiency of the production line, and also conducive to ensuring the consistency and accuracy of the steel strip surface defect inspection.

[0038] Exemplarily, the imaging device 21 includes but is not limited to a line scan camera, an area array camera, etc.

[0039] In some embodiments, the image acquisition module 2 further includes a first adjustment mechanism 22 and a light source 23, and the light source 23 is mounted on the movable end of the first adjustment mechanism 22. The first adjustment mechanism 22 is used to adjust the angle of light emitted by the light source 23 to the steel strip, or to adjust the relative distance between the light source 23 and the steel strip, or to adjust the angle of light emitted by the light source 23 to the steel strip, and the relative distance between the light source 23 and the steel strip, so that the light source 23 can provide illumination for the imaging device 21 to capture the surface image of the steel strip, thereby facilitating the improvement of 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 steel strip.

[0040] Exemplarily, in order to prevent the light intensity of the external environment from affecting the imaging clarity of the imaging device 21, the light intensity of the light source 23 can be set to 10000 Lux.

[0041] 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 the bracket 11 of the frame 1, and the bracket 11 is provided with a first strip hole, through which the distance between the first connecting plate 221 and the strip steel can be adjusted. The positioning block 224 is screwed on the first connecting plate 221 by screws. After the distance between the first connecting plate 221 and the strip steel is adjusted, the positioning screw 223 passes through the bracket 11 and is connected to the positioning block 224, thereby fixing the first connecting plate 221 on the bracket 11. The first connecting plate 221 is provided with an arc hole, and the second connecting plate 222 is connected to the first connecting plate 221 through the arc hole, so that the second connecting plate 222 can rotate relative to the first connecting plate 221. And the second connecting plate 222 is installed with a light source 23, and the irradiation angle of the light source 23 is adjusted by rotating the second connecting plate 222.

[0042] In some embodiments, the imaging device 21 is configured as a line scan camera. In order 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 further includes a protective shell 24, in which the line scan camera is installed. A window 241 is provided on the side of the protective shell 24 facing the steel strip, and the shooting surface of the line scan camera is arranged opposite to the window 241, and the surface image of the steel strip is captured through the window 241.

[0043] Exemplarily, the window 241 is made of a transparent material, such as glass, to ensure that the line scan camera captures the surface image of the strip through the window 241. In order to ensure that the line scan camera is in a closed environment, the protection level of the protective shell 24 can be set to IP65.

[0044] 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 in the protective shell 24, so that the second adjustment mechanism 25 can drive the imaging device 21 to approach or move away from the strip, or drive the imaging device 21 to move along the cross-set direction of the frame 1, or drive the imaging device 21 to approach or move away from the strip, and drive the imaging device 21 to move along the cross-set direction of the frame 1, so that the shooting range of the imaging device 21 can completely cover the width direction of the strip.

[0045] In one example, the second adjustment mechanism 25 includes a third connecting plate 251 and a linear module 252. The third connecting plate 251 is provided with a second strip hole, and is mounted on the inner side wall of the protective cover 12 of the frame 1 through the second strip hole. The position of the third connecting plate 251 in the span direction of the frame 1 can be adjusted through the second strip hole, that is, the relative position of the third connecting plate 251 and the width direction of the strip can be adjusted. The linear module 252 is connected to the third connecting plate 251, and the driving end of the linear module 252 is installed with a protective shell 24, and the linear module 252 drives the protective shell 24 to approach or move away from the strip.

[0046] In some embodiments, the image acquisition module 2 further includes a purge mechanism, which is located below the viewing window 241 to blow away the dust below the viewing window 241, which is beneficial to reducing the impact of dust on the imaging clarity of the line scan camera, and is also beneficial to preventing the line scan camera from capturing dust into the image of the strip surface, thereby facilitating the subsequent misjudgment of strip surface defects and improving the accuracy of judging strip surface defects. The purge mechanism includes an air knife 26, which extends along the span direction of the frame 1 and continuously blows air along the conveying direction of the strip to blow away the dust.

[0047] In some embodiments, more than one line scan camera is provided, and the number of line scan cameras can be 1, 2, 3, etc., and the specific number is adaptively set according to the shooting range of the line scan camera and the width size of the strip. More than one second adjustment mechanism 25 and air knife 26 are also provided, and the number of the second adjustment mechanism 25 and air knife 26 is set one-to-one according to the number of line scan cameras, so that each line scan camera is correspondingly provided with an air knife 26 and a second adjustment mechanism 25, so that there is an air knife 26 in front of the shooting surface of each line scan camera to blow away the dust, and each line scan camera can be controlled separately, which is conducive to improving the flexibility of line scan camera adjustment.

[0048] Multiple line scan cameras are arranged at intervals along the span direction of the frame 1, so that the shooting range of the multiple line scan cameras can completely cover the width of the strip, which is conducive to improving the speed of image acquisition, thereby realizing real-time detection of the strip. And the scanning lines of the multiple line scan cameras are kept in a straight line, which is conducive to improving the overall accuracy of the images taken by the line scan cameras after splicing.

[0049] In one example, the strip steel detection module 3 includes a photoelectric sensor, which detects whether there is a strip steel in the shooting area of ​​the imaging device 21 .

[0050] In another example, the strip steel detection module 3 includes a speed sensor 31, which is used to detect the moving speed of the strip steel. When the speed sensor 31 detects that the moving speed of the strip steel is greater than 0, it indicates that there is a strip steel in the shooting area of ​​the imaging device 21, and the control module 4 turns on the imaging device 21 to collect the surface image of the strip steel. Furthermore, by convolving the detected moving speed of the strip steel, the length information of the strip steel can be obtained, and when the control module 4 identifies and judges the collected image and finds the surface defects of the strip steel, the specific position of the surface defects on the strip steel can be determined for subsequent operations.

[0051] Exemplarily, the speed sensor 31 may be configured as a Doppler laser speed meter or the like.

[0052] 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 is used to detect the real-time temperature of the image acquisition module 2 and the strip steel detection module 3. The control module 4 adjusts the cooling efficiency of the cooling module 5 on the image acquisition module 2 and the strip steel detection module 3 according to the real-time temperature, thereby maintaining the temperature of the image acquisition module 2 and the strip steel detection module 3 within the normal working temperature range to ensure the normal working of the image acquisition module 2 and the strip steel detection module 3.

[0053] 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 arranged on the imaging device 21, and is used to detect the real-time temperature of the imaging device 21, and upload the real-time temperature to the control module 4. The second temperature sensor is arranged on the light source 23, and is used to detect the real-time temperature of the light source 23, and upload the real-time temperature to the control module 4. The third temperature sensor is arranged on the speed sensor 3, and is used to detect the real-time temperature of the speed sensor 3, and upload the real-time temperature to the control module 4.

[0054] Exemplarily, the first temperature sensor is a temperature sensor provided by 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 .

[0055] In one example, the frame 1 includes a protective cover 12, and the image acquisition module 2 and the strip steel detection module 3 are both installed in the protective cover 12, so that the image acquisition module 2 and the strip steel detection module 3 are isolated from the external high temperature and high dust environment, which is conducive to improving the service life of the image acquisition module 2 and the strip steel detection module 3. The protective cover 12 is provided with an opening 121 on the side facing the strip steel, and the opening 121 is used for the image acquisition module 2 to capture the surface image of the strip steel, the strip steel detection module 3 to detect whether there is a strip steel in the shooting area of ​​the imaging device 21, and the light source 23 to irradiate the strip steel to avoid, that is, the imaging device 21 can capture the surface image of the strip steel through the opening 121, the speed sensor 31 can detect the strip steel through the opening 121, and the light emitted by the light source 23 passes through the opening 121 and irradiates on the strip steel.

[0056] The cooling module 5 includes an air cooling mechanism 51 and a water cooling mechanism 52, or the cooling module 5 includes the air cooling mechanism 51, or the cooling module 5 includes the water cooling mechanism 52, so as to cool down the image acquisition module 2 and the strip steel detection module 3 located in the protective cover 12. Cooling the image acquisition module 2 and the strip steel detection module 3 by the cooling module 5 is beneficial to ensure the normal operation of the image acquisition module 2 and the strip steel detection module 3, and is also beneficial to prolonging the service life of the image acquisition module 2 and the strip steel detection module 3.

[0057] Exemplarily, the air cooling mechanism 51 is used to speed up the flow of air in the protective cover 12 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, and the like.

[0058] The water cooling mechanism 52 includes a cooling pipe which is wound around the housings of the imaging device 21 , the light source 23 and the speed sensor 31 , and the cooling pipe is filled with cooling water to cool the imaging device 21 , the light source 23 and the speed sensor 31 .

[0059] Exemplarily, the air knife 26 is installed at the opening 121 of the protective cover 12 , which helps to prevent dust outside the protective cover 12 from entering the protective cover 12 .

[0060] In summary, the present invention provides a detection device for surface defects of steel coils, which is achieved by installing a frame across the raw material inlet end of the cold rolling line, and arranging an image acquisition module, a strip detection module and a control module on the frame, 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. When the strip detection module detects that a strip passes through the shooting area of ​​the imaging device of the image acquisition module, the control module turns on the imaging device to capture the surface image of the strip, and identifies and judges the captured image to confirm the surface defects of the strip, thereby replacing manual visual inspection, which is beneficial to improving the efficiency of strip surface defect inspection, and further beneficial to improving the production efficiency of the production line, and is also beneficial to ensuring the consistency and accuracy of strip surface defect inspection.

[0061] The present invention also provides a method for collecting images of a steel strip surface, which is applied to the above-mentioned device for detecting surface defects of a steel coil. The method may include steps S110 to S120, which are described in detail as follows:

[0062] Step S110, acquiring the condition of the steel strip within the imaging range of the image acquisition module 2 in real time.

[0063] Exemplarily, the strip steel condition includes whether the strip steel passes through or not, that is, whether the strip steel passes through within the imaging range of the image acquisition module 2 .

[0064] In some embodiments, after turning on the detection device for surface defects of the steel coil, the control module 4 turns on the strip detection module 3 located above the cold rolling line, and uses the speed sensor 31 to detect whether there is a strip passing through the shooting area of ​​the imaging device 21 of the image acquisition module 2.

[0065] Step S120 , after confirming that the steel strip has passed, the surface image of the steel strip is acquired by the imaging device 21 of the image acquisition module 2 .

[0066] In some embodiments, when the strip inspection module 3 detects that a strip has passed through the shooting area of ​​the imaging device 21 , the control module 4 turns on the imaging device 21 of the image acquisition module 2 to capture the surface image of the strip, and transmits the captured strip surface image to the control module 4 .

[0067] In order to ensure the normal operation of the image acquisition module 2 and the strip steel detection module 3, the method further includes steps S210 to S220, which are described in detail as follows:

[0068] Step S210 , obtaining a first real-time temperature of the imaging device 21 , a second real-time temperature of the light source 23 of the image acquisition module 2 , and a third real-time temperature of the speed sensor 31 of the strip detection module 3 .

[0069] In some embodiments, a first real-time temperature of the imaging device 21 of the image acquisition module 2 is detected by a first temperature sensor, and the first real-time temperature is uploaded to the control module 4. A second real-time temperature of the light source 23 of the image acquisition module 2 is detected by a second temperature sensor, and the second real-time temperature is uploaded to the control module 4. A third real-time temperature of the speed sensor 31 of the strip detection module 3 is detected by a third temperature sensor, and the third real-time temperature is uploaded to the control module 4.

[0070] Step S220: adjusting the cooling efficiency of the cooling module 5 according to the first real-time temperature, the second real-time temperature and the third real-time temperature.

[0071] In some embodiments, the control module 4 compares the acquired first real-time temperature with the temperature range of normal operation of the imaging device 21. If the first real-time temperature is greater than the temperature range of normal operation of the imaging device 21, the cooling efficiency of the cooling module 5 is increased; if the first real-time temperature is less than the temperature range of normal operation of the imaging device 21, the cooling efficiency of the cooling module 5 is reduced.

[0072] The control module 4 compares the acquired second real-time temperature with the temperature range for normal operation of the light source 23. If the second real-time temperature is greater than the temperature range for normal operation of the light source 23, the cooling efficiency of the cooling module 5 is increased; if the second real-time temperature is less than the temperature range for normal operation of the light source 23, the cooling efficiency of the cooling module 5 is reduced.

[0073] The control module 4 compares the acquired third real-time temperature with the temperature range for normal operation of the speed sensor 31. If the third real-time temperature is greater than the temperature range for normal operation of the speed sensor 31, the cooling efficiency of the cooling module 5 is improved; if the third real-time temperature is less than the temperature range for normal operation of the speed sensor 31, the cooling efficiency of the cooling module 5 is reduced.

[0074] When the cooling module 5 adopts the air cooling mechanism 51, if the air cooling mechanism 51 adopts a fan, the cooling efficiency of the cooling module 5 can be changed by changing the rotation speed of the fan. If any of the first real-time temperature, the second real-time temperature and the third real-time temperature is higher than the normal operating temperature range of the corresponding device, the air cooling mechanism 51 improves the cooling efficiency.

[0075] When the cooling module 5 adopts the water cooling mechanism 52, the cooling efficiency of the cooling module 5 can be changed by changing the temperature of the cooling water in the cooling pipe and the flow rate of the cooling water. Since the cooling pipes for cooling the imaging device 21, the light source 23 and the speed sensor 31 are independently provided, the cooling efficiency of each cooling pipe can be controlled separately.

[0076] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A device for detecting surface defects of a steel coil, characterized in that: include: The frame is installed across the raw material inlet end of the cold rolling line; An image acquisition module, connected to the frame and located above the cold rolling line, includes an imaging device for capturing a surface image of the steel strip unrolled from the steel coil; A strip steel detection module, connected to the frame and located above the cold rolling line, for detecting whether there is a strip steel in the shooting area of ​​the imaging device; A control module is connected to the frame and is electrically connected to the image acquisition module and the strip steel detection module. When the strip steel detection module detects the strip steel, the control module turns on the image acquisition module to capture a surface image of the strip steel, and determines surface defects of the strip steel based on the surface image of the strip steel.

2. The device for detecting surface defects of a steel coil according to claim 1, characterized in that: The detection device also includes 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.

3. The device for detecting surface defects of a steel coil according to claim 2, characterized in that: The strip steel detection module comprises a speed sensor, and the speed sensor is used to detect the moving speed of the strip steel to determine the position of the surface defect of the strip steel.

4. The device for detecting surface defects of a steel coil according to claim 3, characterized in that: The image acquisition module also includes a first adjustment mechanism and a light source connected to the active end of the first adjustment mechanism. The first adjustment mechanism is used to adjust the irradiation angle of the light source and / or drive the light source to approach or move away from the strip. The light source provides illumination for the imaging device to capture the surface image of the strip.

5. The device for detecting surface defects of a steel coil according to claim 4, characterized in that: The temperature detection module includes a first temperature sensor, a second temperature sensor and a third temperature sensor. The first temperature sensor is used to detect the real-time temperature of the imaging device, the second temperature sensor is used to detect the real-time temperature of the light source, and the third temperature sensor is used to detect the real-time temperature of the speed sensor.

6. The device for detecting surface defects of a steel coil according to claim 2, characterized in that: The frame includes a protective cover, which has an opening on a side facing the strip steel, and the image acquisition module and the strip steel detection module are both arranged in the protective cover; the cooling module includes an air cooling mechanism and / or a water cooling mechanism to cool the image acquisition module and the strip steel detection module.

7. The device for detecting surface defects of a steel coil according to any one of claims 1 to 6, characterized in that: The imaging device is configured as a line scan camera; the image acquisition module also includes a protective shell, the line scan camera is arranged in the protective shell, a window is provided on the side of the protective shell facing the strip, the shooting surface of the line scan camera is arranged opposite to the window, and the surface image of the strip is captured through the window.

8. The device for detecting surface defects of a steel coil according to claim 7, characterized in that: The image acquisition module also includes a second adjustment mechanism and a purging mechanism located below the viewing window, wherein the movable end of the second adjustment mechanism is connected to the protective shell to drive the imaging device to approach or move away from the strip, and / or drive the imaging device to move along the cross-set direction of the frame; the purging mechanism includes an air knife, which extends along the cross-set direction of the frame and continuously blows air along the conveying direction of the strip.

9. A method for collecting images of a strip surface, characterized in that: Applied to the device for detecting surface defects of a steel coil as claimed in any one of claims 1 to 8, the method comprising: Real-time acquisition of the strip steel condition within the imaging range of the image acquisition module, wherein the strip steel condition includes whether the strip steel passes through or not; After confirming that the steel strip has passed through, the surface image of the steel strip is acquired by the imaging device of the image acquisition module.

10. The method for collecting the surface image of a steel strip according to claim 9, characterized in that: The method further comprises: Acquire a first real-time temperature of the imaging device, a second real-time temperature of the light source of the image acquisition module, and a third real-time temperature of the speed sensor of the strip detection module; The cooling efficiency of the cooling module is adjusted according to the first real-time temperature, the second real-time temperature and the third real-time temperature.

Images