Image acquisition device for metal surface cleanliness detection

Abstract

The utility model discloses an image acquisition device for metal surface cleanliness detection, which comprises a detection table, a conveying mechanism and an image acquisition mechanism are arranged on the detection table, the conveying mechanism comprises a conveying belt arranged in the middle of the upper part of the detection table, and the image acquisition mechanism is used for acquiring image information of a workpiece to be detected. The image acquisition mechanism comprises two L-shaped detection supports which are arranged on the two sides of the detection table respectively, independent imaging modules are arranged on the L-shaped detection supports respectively, the imaging modules are a surface acquisition module and a polarization acquisition module respectively, the surface acquisition module is composed of a camera body, a lens and a light source, and the polarization acquisition module is composed of a polarization acquisition module. The polarization acquisition module consists of a polarization camera main body, a polarization lens and a polarization light source; according to the invention, two groups of different contrast images can be obtained, image samples are increased, errors of a single camera in image acquisition can be avoided, and a metal cleanliness detection result is more accurate.

Description

Technical Field

[0001] The utility model relates to an image acquisition device, in particular to an image acquisition device used for detecting the cleanliness of metal surfaces. Background Art

[0002] Surface cleanliness refers to the presence of contaminants on the surface of a workpiece or object. It consists of two factors: the type and concentration of contaminants. The type of contaminants is determined by the process and production steps, while the concentration is determined by the metal material and surface roughness. Surface cleanliness directly impacts product quality, especially for parts that require subsequent electroplating processes. Lower cleanliness can directly affect the plating effect.

[0003] According to the publication number CN216208668U, a mechanism for detecting the surface cleanliness of metal sheets has been published, including a base plate, a guide rail, a detection head mechanism, a cloth changing mechanism, a camera, and a pressure film. When the device is in operation, the metal sheet is fixed to the discharge platform on the base by a limit block, and the detection head mechanism equipped with a non-woven fabric is driven to move by the guide rail. The pressure is detected by the pressure film to ensure that the non-woven fabric applies uniform force to the metal sheet. By setting the movement trajectory of the detection head, the number of times the non-woven fabric is wiped is further stabilized. After the non-woven fabric sampling is completed, it is reset, and the camera extracts the image of the target area as the basis for cleanliness detection. After the acquisition is completed, the non-woven fabric is replaced by the cloth changing mechanism. In this process, the surface cleanliness of different materials can be detected by changing the reference data, which effectively improves the accuracy of the test results, makes up for the defects of manual sampling, and improves the production efficiency of the industrial assembly line.

[0004] According to publication number CN216309710U, a surface cleanliness testing device is disclosed, which belongs to the technical field of high-precision processing of semiconductors, wafers, OLEDs, etc. It includes a background light source, a co-directional light source, a bracket, a coaxial ring light source, a prism, a prism fixing bracket, a droplet, a sample to be tested and an imaging system. The prism is fixed to the prism fixing bracket by a top screw fixing screw. By imaging in the same image from multiple perspectives such as top view and side view, an effective combined measurement of UV analysis, infrared analysis, surface structure analysis, and 3D contact angle analysis is achieved. It has great benefits in evaluating the physical and chemical properties of solid materials, especially in solving the misjudgment of surface cleanliness caused by objective surface roughness, chemical diversity and surface structure, and improving the accuracy and reliability of surface cleanliness testing. It plays a very important role in industries such as semiconductors, wafers, silicon wafers, new materials research, and biomimetic materials, and has extremely high promotion value. However, this method requires different methods for different detection objects.

[0005] Based on the above two patents, existing cleanliness detection devices, similar to the surface cleanliness detection method for metal sheets, require contact with the surface of the object being tested to obtain a basis for judgment. There are two major problems with this. The contact type can effectively detect objects with a large contact surface, but it is difficult to achieve surface contact for parts with small size and irregular surfaces. Different contact schemes need to be adjusted for different parts, and high requirements are placed on the placement and spacing of the parts. The second vision-based detection method can achieve surface detection through the collected images and adapt to various stains by changing the detection scheme. However, it also has problems. The UV analysis and infrared methods used are based on the reflection of different substances under ultraviolet or infrared conditions. For low concentrations of surface pollutants, the difference presented will be very small. Most existing image acquisition devices use a single camera acquisition mode, and the small number of image samples they collect makes the collected images unable to serve as an accurate basis for judgment. They also have additional ultraviolet and infrared devices, which have certain cost requirements. Utility Model Content

[0006] The utility model aims to provide an image acquisition device for metal surface cleanliness detection, which can acquire different images of a workpiece to be detected for comparison, thereby avoiding errors in image acquisition by a single camera.

[0007] The utility model is realized through the following technical solutions:

[0008] An image acquisition device for detecting the cleanliness of metal surfaces includes an inspection platform, on which a transmission mechanism and an image acquisition mechanism are provided. The transmission mechanism includes a conveyor belt arranged in the middle of the upper part of the inspection platform for transporting a workpiece to be inspected to an acquisition area corresponding to the image acquisition mechanism. The image acquisition mechanism is used to obtain image information of the workpiece to be inspected, and the image acquisition mechanism includes two L-shaped inspection brackets respectively arranged on both sides of the inspection platform. Independent imaging modules are respectively provided on the L-shaped inspection brackets, and the imaging modules are respectively a surface acquisition module and a polarization acquisition module, wherein the surface acquisition module is composed of a camera body, a lens and a light source, and the polarization acquisition module is composed of a polarization camera body, a polarization lens and a polarization light source.

[0009] Preferably, the L-shaped detection bracket includes a vertical guide rail and a horizontal guide rail, and the two guide rails are connected at 90° and the stability of the L-shaped detection bracket is increased by setting supporting angle pieces, wherein a horizontal telescopic rod is slidably sleeved in the horizontal guide rail, and the imaging module is provided at the end of the horizontal telescopic rod away from the vertical guide rail, and a bracket base is provided at the bottom of the detection bracket, the bracket base is connected to both sides of the detection platform, and a connecting tube is provided on the top of the bracket base, and the vertical guide rail is movably sleeved in the connecting tube.

[0010] Furthermore, an integrated seat is provided at one end of the horizontal telescopic rod away from the vertical guide rail, a rotating table is connected to the bottom of the integrated seat, a connecting piece is fixedly provided on the side of the rotating table away from the integrated seat, and assembly holes for unified connection are reserved on the connecting piece from top to bottom for the camera body, lens and light source.

[0011] Furthermore, the bracket base is provided with a base bolt hole, and a plurality of bolt fixing holes for connecting and fixing with the bracket base are reserved evenly and equidistantly on both sides of the testing platform.

[0012] Furthermore, the vertical guide rail and the horizontal telescopic rod are provided with scale marks for adjusting the height and length of the detection bracket.

[0013] Preferably, the conveyor belt is installed in the middle of the upper part of the detection platform through detachable fixing parts provided on both sides.

[0014] Preferably, the conveying mechanism also includes a bottom motor, a gearbox and a transmission belt. The bottom motor is arranged below the conveyor belt. The output end of the bottom motor is connected to the gearbox through a connecting shaft, and the output end of the gearbox is connected to the pulley on one side of the conveyor belt through a transmission belt.

[0015] Preferably, it also includes a control mechanism, which includes a motor controller, a camera and light source controller, and a control switch. The motor controller, the camera and the light source controller are connected to an industrial computer. The control switch is used to start the detection platform and is arranged on one side of the detection platform.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention provides two different imaging modules, including a surface acquisition module consisting of a camera body, a lens, and a light source, and a polarization acquisition module consisting of a polarization camera body, a polarization lens, and a polarization light source. This can obtain two different sets of contrast images, increase the number of image samples, avoid the error of a single camera in image acquisition, and make the metal cleanliness detection results more accurate.

[0018] (2) The image acquisition mechanism of the present invention includes a detection bracket. The position of the detection bracket can be manually adjusted by means of a bracket base provided at the bottom of the detection bracket and a number of bolt fixing holes evenly and equidistantly reserved on both sides of the detection table. The detection bracket also includes a vertical guide rail with adjustable height and a horizontal telescopic rod that can be extended and retracted in the horizontal direction, thereby further changing the height position of the imaging mechanism, etc., and can adapt to different types of workpieces to be detected, making image acquisition more flexible and reliable;

[0019] (3) By setting up a detachable structure of the detection bracket and transmission belt of the device, the application scenarios of the device can be improved, and the installation and recycling are more convenient and flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the detection bracket structure of the utility model;

[0022] Figure 3 This is a schematic structural diagram of the imaging module of the present utility model;

[0023] Figure 4 This is a schematic diagram of the transmission mechanism structure of the present utility model.

[0024] In the figure: 1. Inspection table; 2. Conveyor belt; 21. Bottom motor; 22. Gearbox; 23. Drive belt; 3. Inspection bracket; 31. Vertical guide rail; 32. Horizontal guide rail; 33. Support angle piece; 34. Horizontal telescopic rod; 35. Bracket base; 36. Connecting pipe; 4. Imaging module; 41. Integrated seat; 42. Rotating table; 43. Connecting piece; 5. Removable fixing piece. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to specific embodiments. The following description is intended to explain the present invention rather than to limit it.

[0026] refer to Figure 1 As shown, the utility model provides an image acquisition device for metal surface cleanliness detection, including a detection table 1, and a conveyor belt 2 is provided on the detection table 1 through a detachable fixing part 5, and L-shaped detection brackets 3 are also provided on both sides of the detection table 1, and imaging modules 4 are provided on the detection brackets 3, and the imaging modules 4 are respectively a surface acquisition module and a polarization acquisition module. The surface acquisition module consists of a camera body, a lens and a light source for directly acquiring the surface image of the workpiece, while the polarization acquisition module consists of a polarization camera body, a polarization lens and a polarization light source for acquiring the polarization image of the object surface. The covering parts of the two imaging modules are separated to reduce the interference of the light source error, and at the same time, two sets of different images are obtained through these two different image acquisition methods, which increases the contrast image samples and reduces the detection error.

[0027] refer to Figure 2As shown, the detection bracket 3 includes a vertical guide rail 31 and a horizontal guide rail 32, and the two guide rails are connected at 90 degrees. The stability of the bracket is increased by supporting angle pieces 33. A horizontal telescopic slide rod 34 is slidably sleeved in the horizontal guide rail 32. An imaging module 4 is provided at one end of the horizontal telescopic slide rod 34 away from the vertical guide rail 31. A bracket base 35 is provided at the bottom of the detection bracket 3, and a connecting tube 36 is provided at the top of the bracket base 35. The vertical guide rail 31 is slidably sleeved in the connecting tube 36. The vertical guide rail 31 and the horizontal guide rail 32 are used to adjust the detection range of the imaging module.

[0028] refer to Figure 3 As shown, the imaging module 4 is mounted on the connecting piece 43 and connected to the horizontal telescopic rod 34 through the integrated seat 41. The integrated seat 41 is arranged at the end of the horizontal telescopic rod 34 away from the vertical guide rail 31, and a rotating platform 42 is connected to the bottom of the integrated seat 41. The connecting piece 43 is fixedly arranged on the side of the rotating platform 42 away from the integrated seat 41. Assembly holes are reserved on the connecting piece 43 from top to bottom for the camera body, lens and light source, which can be connected in a unified manner. The camera and the light source are coaxially connected. The diameter of the light source is smaller than the diameter of the lens and does not affect the lens's image acquisition. The rotating platform 42 can adjust the angle of the entire imaging module 4, and the integrated seat 41 is also provided with a control line plug for powering the rotating platform 42 and a turntable switch button for controlling the start and stop of the rotating platform 42. After selecting a suitable angle, the rotating platform 42 can be powered off to maintain a fixed shooting angle. The surface acquisition module and the polarization acquisition module have the same structure, and a data transmission socket can also be provided on the imaging module 4 to power the imaging module 4 or transmit the collected data.

[0029] In order to ensure the supporting strength, the bracket base 35 is a trapezoidal structure as a whole. A base bolt hole is provided on the bracket base 35, and a number of bolt fixing holes are reserved on both sides of the detection platform 1. The bracket base 35 is connected to the detection platform 1 by bolts, and the several bolt fixing holes on both sides of the detection platform 1 can also adjust the position of the detection bracket 3 and then adjust the detection position of the camera.

[0030] refer to Figure 4 As shown, a bottom motor 21 is also provided under the detection table 1, and the speed of the conveyor belt 2 can be adjusted by the bottom motor 21. The bottom motor 21 is connected to the gearbox 22 through a connecting shaft. The output end of the gearbox 22 is connected to the pulley on one side of the conveyor belt 2 through a transmission belt 23 to provide power for the conveyor belt. The motor controller, camera and light source controller are connected to the industrial computer through a network cable. The industrial computer controls the detection process and presents the results on the display. Finally, the detection results can be obtained through image processing. At the same time, the control switch is set on one side of the device. Simple control adjustment under the default parameters can be achieved through the control switch, and the conveyor belt is provided with a conveyor belt distance adjustment bolt to adjust the distance between the two ends of the conveyor belt to achieve tightness adjustment.

[0031] A light shield is provided on the detection platform 1. When the detection bracket 3 is located in the same horizontal plane and the imaging module 4 is relatively close, in order to avoid the influence of the dual light source on the polarization acquisition, the light shield can be covered on the detection bracket 3 and the detection platform 1 and the two parts of the imaging module 4 are separated. An adjustable opening is provided on the light shield, which can be used to reduce the light source interference to the two cameras. At the same time, when the dual detection brackets 3 are collecting images of larger workpieces, they can be staggered and centered, that is, the two detection brackets 3 are not in the same horizontal plane. By extending each of the horizontal telescopic rods 34, the images are collected in sequence to ensure the effect.

[0032] The operating principle of the present utility model is as follows: the device is started by controlling the switch, and the original default parameters such as conveyor belt speed and light source brightness can also be reasonably adjusted through the industrial computer according to the size, length and other characteristics of the workpiece to be detected, and the height and position of the detection bracket 3 are manually adjusted by adjusting the installation position of the bracket base 35 and the height of the vertical guide rail 31, and then the position of the imaging module 4, i.e. the camera, lens and light source, is further adjusted through the horizontal telescopic rod 34. After the adjustment is completed, the workpiece to be detected is placed at the starting end of the conveyor belt 2, and two different sets of image samples are obtained through two different imaging modules 4, the surface acquisition module and the polarization acquisition module, and displayed on the display screen.

[0033] The above content is a further detailed description of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these embodiments. For ordinary technicians in the technical field of the present invention, without departing from the concept of the present invention, they can also make several simple deductions or substitutions, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. An image acquisition device for detecting the cleanliness of a metal surface, characterized in that: The invention comprises a detection platform (1), wherein a transmission mechanism and an image acquisition mechanism are arranged on the detection platform (1), wherein the transmission mechanism comprises a conveyor belt (2) arranged in the middle of the upper part of the detection platform for conveying the workpiece to be detected to the acquisition area corresponding to the image acquisition mechanism, wherein the image acquisition mechanism obtains image information of the workpiece to be detected, and the image acquisition mechanism comprises two L-shaped detection brackets (3) respectively arranged on both sides of the detection platform (1), and independent imaging modules (4) are respectively arranged on the L-shaped detection brackets (3), wherein the imaging modules are respectively a surface acquisition module and a polarization acquisition module, wherein the surface acquisition module is composed of a camera body, a lens and a light source, and the polarization acquisition module is composed of a polarization camera body, a polarization lens and a polarization light source.

2. The image acquisition device for metal surface cleanliness detection according to claim 1, characterized in that: The L-shaped detection bracket (3) includes a vertical guide rail (31) and a horizontal guide rail (32), and the two guide rails are connected at 90 degrees and the stability of the L-shaped detection bracket (3) is increased by providing a supporting angle piece (33), wherein a horizontal telescopic rod (34) is slidably sleeved in the horizontal guide rail (32), and the imaging module (4) is provided at one end of the horizontal telescopic rod (34) away from the vertical guide rail (31), and a bracket base (35) is provided at the bottom of the detection bracket (3), and the bracket base (35) is connected to both sides of the detection table (1), and a connecting pipe (36) is provided on the top of the bracket base (35), and the vertical guide rail (31) is movably sleeved in the connecting pipe (36).

3. The image acquisition device for metal surface cleanliness detection according to claim 2, characterized in that: An integrated seat (41) is provided at one end of the horizontal telescopic rod (34) away from the vertical guide rail (31), a rotating platform (42) is connected to the bottom of the integrated seat (41), a connecting member (43) is fixedly provided on one side of the rotating platform (42) away from the integrated seat (41), and assembly holes for unified connection are reserved on the connecting member (43) from top to bottom for the camera body, lens and light source.

4. The image acquisition device for metal surface cleanliness detection according to claim 2, characterized in that: The bracket base (35) is provided with base bolt holes, and a plurality of bolt fixing holes for connecting and fixing with the bracket base (35) are reserved at even intervals on both sides of the detection platform (1).

5. The image acquisition device for metal surface cleanliness detection according to claim 2 or 3, characterized in that: The vertical guide rail (31) and the horizontal telescopic rod (34) are provided with scale marks for adjusting the height and length of the detection bracket (3).

6. The image acquisition device for metal surface cleanliness detection according to claim 1, characterized in that: The conveyor belt (2) is mounted in the middle of the upper portion of the detection platform (1) via detachable fixing members (5) provided on both sides.

7. The image acquisition device for metal surface cleanliness detection according to claim 1, characterized in that: The conveying mechanism further comprises a bottom motor (21), a gearbox (22) and a transmission belt (23). The bottom motor (21) is arranged below the conveyor belt (2). The output end of the bottom motor (21) is connected to the gearbox (22) via a connecting shaft, and the output end of the gearbox (22) is connected to a pulley on one side of the conveyor belt via a transmission belt (23).

8. The image acquisition device for metal surface cleanliness detection according to claim 1, characterized in that: It also includes a control mechanism, which includes a motor controller, a camera and light source controller, and a control switch. The motor controller, the camera and the light source controller are connected to an industrial computer. The control switch is used to start the detection platform and is arranged on one side of the detection platform.

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