A device and method for detecting hub bolt hole blockage online

Abstract

The present invention provides an online detection device and method for hub bolt hole blockage, which relates to the field of hub bolt hole blockage detection. The scheme adopted is: comprising a bracket, an industrial camera is arranged on the bracket, and the industrial camera is located above the conveyor line; the industrial camera is electrically connected to a controller, and the controller can control the industrial camera to take pictures. The controller is provided with an image analysis module, a storage module and an input module, and a detection sensor is electrically connected to the controller, and the detection sensor is arranged on the conveyor line. Along the conveying direction of the conveyor line, the detection sensor is located behind the industrial camera. When the detection sensor starts to detect the wheel hub to be tested, the controller controls the industrial camera to take pictures. When the detection sensor cannot detect the wheel hub to be tested, the controller controls the industrial camera to stop taking pictures. The present invention can detect whether the bolt hole of the wheel hub to be tested is blocked online, and the detection is accurate and effective, which greatly reduces the labor intensity of workers.

Description

Technical Field

[0001] The invention relates to the field of wheel hub bolt hole blockage detection, and in particular to an online detection device and method for wheel hub bolt hole blockage. Background Art

[0002] The wheel hub is also called the wheel rim. According to the characteristics and requirements of different models, the wheel hub surface treatment process will also adopt different methods, which can be roughly divided into two types: baking paint and electroplating. In order to make the wheel hub have better heat dissipation, the process basically adopts baking paint treatment, that is, spraying paint first and then electric baking. The cost is relatively economical and the color is beautiful and long-lasting. Even if the vehicle is scrapped, the color of the wheel hub remains unchanged; in order to prevent the wheel hub bolt holes from being contaminated by paint during painting and affecting the later assembly, it is necessary to use protective plugs to block the bolt holes before painting so that the paint cannot be sprayed into the bolt holes. After painting, the protective plugs are manually removed, but omissions are inevitable during the disassembly process. If no inspection is performed, it will have a great impact on the later assembly of the whole vehicle. In the prior art, after the wheel hub is electrically baked, the wheel hub on the conveyor line is manually inspected comprehensively, but the inspection efficiency is low, the accuracy is low, and the labor intensity is high.

[0003] Therefore, in view of the current status of the above-mentioned prior art, it is an urgent problem to develop an online detection device and method for wheel hub bolt hole blockage. Summary of the invention

[0004] In order to overcome the deficiencies in the above-mentioned prior art, the present invention provides an online detection device and method for wheel hub bolt hole blockage, which can detect online whether the bolt holes of the wheel hub to be tested are blocked, has high detection accuracy, and greatly reduces the labor intensity of workers.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: an online detection device and method for wheel hub bolt hole blockage, comprising a bracket, an industrial camera is arranged on the bracket, the industrial camera is located above the conveyor line, and the industrial camera is used to obtain a black and white image of the wheel hub; the industrial camera is electrically connected to a controller, the controller can control the industrial camera to take pictures, the controller is provided with an image analysis module, a storage module and an input module, the image analysis module can determine whether there is a deviation between the center angles of all two adjacent bolt holes on the image of the wheel hub to be tested, and the storage module can store the qualified center angle degree of the wheel hub; and also includes a detection sensor, the detection sensor is electrically connected to the controller, the detection sensor is arranged on the conveyor line, and along the conveying direction of the conveyor line, the detection sensor is located behind the industrial camera, when the detection sensor starts to detect the wheel hub to be tested, the controller controls the industrial camera to take pictures, and when the detection sensor cannot detect the wheel hub to be tested, the controller controls the industrial camera to stop taking pictures. Through the cooperation of industrial cameras, controllers and detection sensors, the wheel hub can be photographed and the center angles of all two adjacent bolt holes on the image of the wheel hub to be tested can be measured and judged whether they are qualified. When a bolt hole is blocked, the image cannot display the corresponding bolt hole, resulting in a large deviation in the center angles of the two adjacent bolt holes. Therefore, it is judged that there are blocked bolt holes in the wheel hub to be tested, which improves the detection efficiency and accuracy and greatly reduces the labor intensity of workers.

[0006] Furthermore, a strip light source is provided on the bracket, and the strip light source is located above the conveyor line and obliquely below the industrial camera, and the strip light source adopts a white light source. The strip light source can improve the light intensity, improve the image clarity, avoid misjudgment, and further improve the measurement accuracy.

[0007] Furthermore, the bracket includes a support beam, on which a first crossbar and a second crossbar are movably arranged up and down, the first crossbar and the second crossbar are both retractable structures, the second crossbar is located below the first crossbar, the first crossbar is provided with the industrial camera, and the second crossbar is provided with the strip light source. The positions of the industrial camera and the light source can be adjusted according to the condition of the wheel hub to be measured, thereby improving the applicability of the device.

[0008] Furthermore, a base is provided at the bottom of the support beam, and rollers are provided below the base to facilitate movement.

[0009] Furthermore, a speed sensor is also included, the speed sensor is electrically connected to the controller, the speed sensor is used to detect the real-time speed of the conveyor line, and the controller can also control the exposure time of the industrial camera according to the real-time speed of the conveyor line. The exposure time of the industrial camera can be controlled according to the change of the conveyor line speed, ensuring that clear and undistorted images can be captured when the conveyor line decelerates or accelerates the working speed, further improving the measurement accuracy.

[0010] Furthermore, the image analysis module can also determine whether the shape of each bolt hole is circular. The bolt hole may be slightly blocked due to the skewed installation of the protective plug and poor painting, resulting in the bolt hole shape on the image not being circular. By using the image analysis module to determine whether the shape of the bolt hole is a regular circle, it is possible to find out whether the bolt hole is slightly blocked, further improving the detection accuracy.

[0011] Furthermore, the bracket is also provided with an alarm, which is electrically connected to the controller, and when the bolt hole of the wheel hub to be tested is blocked or slightly blocked, the alarm sends out a corresponding alarm, which can promptly remind the staff to take corresponding measures.

[0012] The present invention also provides a method for detecting hub bolt hole blockage online, using the above-mentioned hub bolt hole blockage online detection device, comprising the following steps:

[0013] S01: adjusting the positions of the industrial camera, the strip light source and the detection sensor according to the size of the wheel hub and the size of the conveyor line;

[0014] S02: inputting the qualified center angles of two adjacent bolt holes into the controller;

[0015] S03: Start the conveyor line;

[0016] S04: the controller adjusts the exposure time of the industrial camera according to the real-time speed of the conveyor line, and when the detection sensor starts to sense the wheel hub to be measured, the industrial camera starts to take pictures and transmit image information of the wheel hub to be measured;

[0017] S05: the image analysis module performs image analysis, and when the image analysis module determines that there is a deviation in the size of the central angle a1 of two adjacent bolt holes on the image or the shape of the bolt hole is not circular, the alarm device issues a corresponding alarm;

[0018] S06: loop S04 and S05. It is possible to detect whether the bolt hole of the wheel hub to be tested is blocked online, with high detection accuracy and greatly reducing the labor intensity of workers.

[0019] Furthermore, in S05, when the image analysis module determines that the center angle of two adjacent bolt holes on the wheel hub deviates from the qualified center angle degree, the alarm device issues a blockage alarm; when the image analysis module determines that the center angle degree of any two adjacent bolt holes on the wheel hub is the same as the qualified center angle degree, the image analysis module further determines whether the shape of the bolt hole is circular. When it is determined that there is a bolt hole that is not circular, the alarm device issues an alarm of unqualified shape.

[0020] Furthermore, in S03, when the speed sensor detects that the real-time speed is zero, the controller controls the industrial camera to stop taking pictures, thereby preventing the industrial camera from repeatedly acquiring images of the same wheel hub when the conveyor line stops operating.

[0021] It can be seen from the above technical solutions that the present invention has the following advantages:

[0022] The present invention provides an online detection device and method for the blockage of wheel hub bolt holes. Through the cooperation of an industrial camera, a controller and a detection sensor, the wheel hub can be photographed and the center angles of all two adjacent bolt holes on the image of the wheel hub to be tested can be measured and determined to be qualified. When a bolt hole is blocked, the image cannot display the corresponding bolt hole, resulting in a large deviation in the center angles of the two adjacent bolt holes. Therefore, it is determined that the wheel hub to be tested has blocked bolt holes, which improves the detection efficiency and detection accuracy and greatly reduces the labor intensity of workers. The light intensity is increased by a strip light source, the image clarity is improved, misjudgment is avoided, and the measurement accuracy is further improved. The speed sensor can control the exposure time of the industrial camera according to the change of the conveyor line speed, further improving the measurement accuracy. The image analysis module can also detect whether the bolt hole is slightly blocked, further improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the assembly structure of the on-line detection device for hub bolt hole blockage and the conveyor line in a specific implementation manner of the present invention.

[0025] Figure 2 It is a schematic diagram of the principle of an online detection device for hub bolt hole blockage in a specific implementation manner of the present invention.

[0026] Figure 3 The figure is a flow chart of the on-line detection method for hub bolt hole blockage in a specific embodiment of the present invention.

[0027] In the figure, 1. base, 2. controller, 3. rotating arm, 4. clamp assembly, 5. alarm, 6. cross bar 1, 7. industrial camera, 8. cross bar 2, 9. strip light source, 10. wheel hub to be tested, 11. detection sensor, 12. conveyor line, 13. speed sensor. DETAILED DESCRIPTION

[0028] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0029] like Figure 1 As shown, this specific embodiment provides an online detection device for hub bolt hole blockage, including a bracket, an industrial camera 7, a strip light source 9, an alarm 5, a controller 2 and a detection sensor 11; the bracket is provided with an industrial camera 7, the industrial camera 7 is used to obtain an image of the wheel hub, the industrial camera 7 adopts a black and white camera, can obtain a black and white image, and more clearly display the blockage of the bolt hole, the industrial camera 7 is located above the conveyor line 12, in order to further improve the image clarity, the bracket is also provided with a strip light source 9, the strip light source 9 is located above the conveyor line 12 and below the industrial camera 7, the strip light source 9 adopts a white light source; the industrial camera 7 is electrically connected to the controller 2, the controller 2 can control the industrial camera 7 to take pictures, the controller 2 is provided with an image analysis module, a storage module and an input module, the image analysis module can obtain the size of the central angle a1 of all two adjacent bolt holes on the image of the wheel hub 10 to be tested and compare it with the qualified central angle a1 through digital image measurement technology. 0 for comparison, the storage module can store the corresponding indicators of the qualified wheel hub, that is, the size of the qualified central angle a0, the input module is used to input relevant indicators, in this specific embodiment, the input module also includes a keyboard, which is convenient for workers to operate; the detection sensor 11 is electrically connected to the controller 2, and the detection sensor 11 is arranged on the conveyor line 12. The detection sensor 11 can adopt a proximity switch or a through-beam photoelectric switch. In this specific embodiment, a through-beam photoelectric switch is used. Along the conveying direction of the conveyor line 12, the detection sensor 11 is located behind the industrial camera 7. When the detection sensor 11 starts to detect the wheel hub 10 to be tested, the controller 2 controls the industrial camera 7 to take pictures. When the detection sensor 11 cannot detect the wheel hub 10 to be tested, the controller 2 controls the industrial camera 7 to stop taking pictures; in this specific embodiment, the industrial camera 7 adopts the Hikvision CL022 line array camera, the controller 2 adopts the Hikvision VC3505, and the image analysis module is equipped with the Hikvision visual software VM-6100.

[0030] In order to facilitate adjustment according to the size of the wheel hub and ensure that a complete and clear wheel hub image is captured, the bracket includes a support beam, on which a cross bar 1 6 and a cross bar 2 8 are movably arranged up and down, and a clamp assembly 4 is arranged at the ends of the cross bar 1 6 and the cross bar 2 8, and the clamp assembly 4 is locked on the support beam by bolts. The cross bar 1 6 and the cross bar 2 8 both adopt a telescopic structure. In this specific embodiment, the cross bar 1 6 and the cross bar 2 8 adopt an electric telescopic rod for easy adjustment. The cross bar 2 8 is located below the cross bar 1 6, and an industrial camera 7 is arranged on the cross bar 1 6, and a strip light source 9 is arranged on the cross bar 2 8. In order not to affect the shooting of the industrial camera 7, the clamp assembly 4 of the cross bar 2 8 is rotatably connected to the cross bar 2 8 through a rotating arm 3 that can rotate in a horizontal plane; in order to facilitate the movement of the device, a base 1 is arranged at the bottom of the support beam, and a roller is arranged below the base 1.

[0031] When the wheel hub is not taken off the line in time, it will cause the wheel hub to be blocked on the conveyor line 12. In order to avoid a large amount of wheel hubs piling up and causing collisions, the conveyor line 12 will slow down and stop. When the number of wheel hubs returns to normal, the speed of the conveyor line 12 rises to the set speed, which leads to a change in the real-time speed of the conveyor line 12. Since the industrial camera 7 has a certain frequency when performing image acquisition, it is expressed by frame rate, and the unit is fps. For example, 30fps means that the camera can collect up to 30 frames of images in 1 second and then synthesize a complete image. When shooting a moving object, the shooting speed of the industrial camera 7 needs to correspond to the speed of the object, otherwise the final image will be distorted. In order to make the conveyor line 12 fast In order to ensure that the industrial camera 7 can obtain a clear and real image when the speed changes, the device also includes a speed sensor 13. The speed sensor 13 can be a photoelectric speed sensor 13, a magnetoelectric speed sensor 13, or a Hall speed sensor 13. In this specific embodiment, a photoelectric encoding wheel is used. The speed sensor 13 is electrically connected to the controller 2. The speed sensor 13 is used to detect the real-time speed of the conveyor line 12. The controller 2 can control the exposure time of the industrial camera 7 according to the real-time speed of the conveyor line 12, and then change the shooting frame rate of the industrial camera 7, so that the shooting speed of the industrial camera 7 corresponds to the speed of the object moving, so as to obtain a clear and undistorted image of the wheel hub 10 to be measured when the speed changes, thereby avoiding misjudgment.

[0032] Due to the skewed installation of the protective plug and poor painting, the bolt hole may be slightly blocked, causing the shape of the bolt hole on the image to be not a regular circle. In order to detect slight blockages and further improve the detection accuracy of the device, the image analysis module can also determine whether the shape of each bolt hole is a regular circle through digital image measurement technology.

[0033] In order to be able to promptly remind the staff to take corresponding measures, an alarm 5 is provided on the bracket, and the alarm 5 is electrically connected to the controller 2. When the bolt hole of the wheel hub 10 to be tested is blocked or the shape is unqualified, the alarm 5 sends out a corresponding alarm; in this specific embodiment, the alarm 5 is provided with a voice player and a display, and the display can display the corresponding text whether the bolt hole is blocked or slightly blocked.

[0034] The detection principle of this device:

[0035] like Figure 2 As shown, when there is a blocked bolt hole, the black and white image of the wheel hub 10 to be tested obtained by the industrial camera 7 cannot display the blocked bolt hole. When the image analysis module detects the center angle of two adjacent bolt holes, due to the missing hole, the center angle degree of one pair of adjacent bolt holes deviates greatly from the qualified center angle degree. Based on this, it is determined that the wheel hub 10 to be tested has a blocked bolt hole.

[0036] like Figure 3 As shown, this specific embodiment also provides a method for online detection of hub bolt hole blockage, using the above-mentioned online detection device for hub bolt hole blockage, comprising the following steps:

[0037] S01: Adjust the positions of industrial cameras, strip light sources and detection sensors according to the size of the wheel hub and the size of the conveyor line;

[0038] S02: Input the qualified center angles of two adjacent bolt holes into the controller;

[0039] S03: Start the conveyor line;

[0040] S04: The controller adjusts the exposure time of the industrial camera according to the real-time speed of the conveyor line. When the detection sensor starts to sense the wheel hub to be tested, the industrial camera starts to take pictures and transmit the image information of the wheel hub to be tested;

[0041] S05: The image analysis module performs image analysis. When the image analysis module determines that there is a deviation in the size of the central angle a1 of two adjacent bolt holes on the image or the shape of the bolt hole is not circular, the alarm device issues a corresponding alarm;

[0042] S06: Repeat S04 and S05.

[0043] Among them, in S05, when the image analysis module determines that the size of the center angle of two adjacent bolt holes on the wheel hub deviates from the qualified center angle, the alarm sends out a blockage alarm; when the image analysis module determines that the size of the center angle of any two adjacent bolt holes on the wheel hub is the same as the qualified center angle, the image analysis module determines whether the shape of the bolt hole is a regular circle. When it is determined that there is a bolt hole that is not a regular circle, the alarm sends out a slight blockage alarm. The shape of the bolt hole can be checked, so as to timely discover the situation of slight blockage of the bolt hole, and further improve the detection accuracy.

[0044] In S03, when the speed sensor detects that the real-time speed is zero, the controller controls the industrial camera to stop taking pictures, so as to avoid the industrial camera repeatedly acquiring images of the same wheel hub when the conveyor line stops operating.

[0045] From the above specific implementations, it can be seen that the present invention has the following beneficial effects:

[0046] 1. Through the cooperation of the industrial camera 7, the controller 2 and the detection sensor 11, the wheel hub can be photographed and the central angles of all two adjacent bolt holes on the image of the wheel hub to be tested can be measured and judged whether they are qualified, thereby improving the detection efficiency and detection accuracy and greatly reducing the labor intensity of workers;

[0047] 2. The strip light source 9 is used to increase the light intensity, improve the image clarity, avoid misjudgment, and further improve the measurement accuracy;

[0048] 3. The speed sensor 13 can control the exposure time of the industrial camera according to the change of the conveyor line speed, thereby further improving the measurement accuracy;

[0049] 4. The image analysis module can also detect whether the bolt hole is slightly blocked, further improving the detection accuracy.

[0050] The terms "upper", "lower", "outer side", "inner side", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish the relative relationship in position without giving qualitative description. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0051] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An online detection device for hub bolt hole blockage, characterized in that: The invention comprises a bracket, on which an industrial camera (7) is arranged, the industrial camera (7) is a black and white camera, the industrial camera (7) is located above the conveyor line, and the industrial camera (7) is used to obtain a black and white image of the wheel hub; the industrial camera (7) is electrically connected to a controller (2), the controller (2) is capable of controlling the industrial camera (7) to take pictures, the controller (2) is provided with an image analysis module, a storage module and an input module, the image analysis module is capable of judging whether there is a deviation in the center angle of all two adjacent bolt holes on the image of the wheel hub to be tested, the image analysis module is capable of judging whether the shape of each bolt hole is circular, and the storage module is capable of storing the degree of the qualified center angle of the wheel hub; and the invention also comprises a detection module. A sensor (11), wherein the detection sensor (11) is electrically connected to the controller (2), and the detection sensor (11) is arranged on the conveyor line. Along the conveying direction of the conveyor line, the detection sensor (11) is located behind the industrial camera (7). When the detection sensor (11) starts to detect the wheel hub to be measured, the controller (2) controls the industrial camera (7) to take pictures. When the detection sensor (11) cannot detect the wheel hub to be measured, the controller (2) controls the industrial camera (7) to stop taking pictures. A strip light source (9) is also arranged on the bracket. The strip light source (9) is located above the conveyor line and obliquely below the industrial camera (7). The strip light source (9) adopts a white light source.

2. The on-line detection device for hub bolt hole blockage according to claim 1, characterized in that: The support comprises a support beam, on which a first crossbar (6) and a second crossbar (8) are movably arranged up and down, the first crossbar (6) and the second crossbar (8) both adopt a retractable structure, the second crossbar (8) is located below the first crossbar (6), the first crossbar (6) is provided with the industrial camera (7), and the second crossbar (8) is provided with the strip light source (9).

3. The on-line detection device for hub bolt hole blockage according to claim 2, characterized in that: A base (1) is provided at the bottom of the support beam, and a roller is provided below the base (1).

4. The on-line detection device for hub bolt hole blockage according to claim 1, characterized in that: It also includes a speed sensor (13), which is electrically connected to the controller (2). The speed sensor (13) is used to detect the real-time speed of the conveyor line. The controller (2) can also control the exposure time of the industrial camera (7) according to the real-time speed of the conveyor line.

5. The on-line detection device for hub bolt hole blockage according to claim 4, characterized in that: An alarm (5) is also provided on the bracket. The alarm (5) is electrically connected to the controller (2). When the bolt hole of the wheel hub to be tested is blocked or slightly blocked, the alarm (5) issues a corresponding alarm.

6. A method for online detection of hub bolt hole blockage, characterized in that: Using the on-line detection device for hub bolt hole blockage as claimed in claim 5 comprises the following steps: S01: adjusting the positions of the industrial camera, the strip light source and the detection sensor according to the size of the wheel hub and the size of the conveyor line; S02: inputting the qualified center angles of two adjacent bolt holes into the controller; S03: Start the conveyor line; S04: the controller adjusts the exposure time of the industrial camera according to the real-time speed of the conveyor line, and when the detection sensor starts to sense the wheel hub to be measured, the industrial camera starts to take pictures and transmit image information of the wheel hub to be measured; S05: the image analysis module performs image analysis, and when the image analysis module determines that there is a deviation in the center angles of two adjacent bolt holes on the image or the shape of the bolt hole is not circular, the alarm device issues a corresponding alarm; S06: Loop S04 and S05.

7. The on-line detection method for hub bolt hole blockage according to claim 6, characterized in that: In S05, when the image analysis module determines that the center angle degree of two adjacent bolt holes on the wheel hub deviates from the qualified center angle degree, the alarm device issues a blockage alarm. When the image analysis module determines that the center angle degree of any two adjacent bolt holes on the wheel hub is the same as the qualified center angle degree, the image analysis module further determines whether the shape of the bolt hole is circular. When it is determined that there is a bolt hole that is not circular, the alarm device issues an alarm of unqualified shape.

8. The on-line detection method for hub bolt hole blockage according to claim 7, characterized in that: In S03, when the speed sensor detects that the real-time speed is zero, the controller controls the industrial camera to stop taking pictures.

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