Metal plate surface detection device based on machine vision

Abstract

The utility model belongs to the technical field of detection, and particularly discloses a metal plate surface detection device based on machine vision. A conveying, detecting and lifting mechanism of the device is electrically connected with a controller, and the controller judges the oil stain condition on the surface of the metal plate according to an image of the detecting mechanism and outputs a result; conveying belts of the conveying mechanism are symmetrically arranged on the two sides of a rack and support a plurality of hanging rods at intervals, a motor I is fixed to the lower portion of the rack, and a transmission assembly I is connected with an output shaft of the motor I and the conveying belts. A lifting support of the lifting mechanism is fixed to the outer side of the conveying belt, sliding frames are symmetrically fixed to the inner side of the lifting support, sliding plates are slidably arranged on the sliding frames, clamping assemblies are fixed to the sliding plates and can clamp the two ends of the hanging rod, a lifting assembly is arranged on the lifting support, and the driving end of the lifting assembly is connected with the two sliding plates. The detection mechanism is arranged in front of and behind the lifting mechanism, a camera lens directly faces the lifting support, and the camera is electrically connected with the controller. The device has the characteristics of simple structure, high detection efficiency and precision, and strong adaptability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of detection, specifically relates to a metal plate surface detection device based on machine vision which has simple structure, high detection efficiency and precision and strong adaptability. BACKGROUND

[0002] In industrial production, metal plates are widely used in the fields of automobiles, aerospace, electrical systems, etc. as important raw materials and components. These fields have very high requirements for the cleanliness of metal surfaces because contaminants such as oil stains may affect the performance, reliability and safety of products. For example, in automobile manufacturing, oil stains may cause increased friction between components, thereby affecting the running efficiency and safety of the entire vehicle. Therefore, metal plate oil stain detection is a key link to ensure product quality and performance.

[0003] For metal plate surface oil stain detection, the traditional method is to visually observe the glossiness, color change and whether there is sticky liquid deposition on the metal surface to determine the presence of oil stains. Although visual method is simple to operate and does not require additional equipment, it requires higher experience and skill of the detection personnel, and may not effectively detect small or hidden oil stains, which is highly subjective.

[0004] With the progress of science and technology and the development of industrial production, metal plate surface oil stain detection has emerged detection technologies such as infrared spectroscopy, electron microscope detection, hyperspectral camera detection, etc. which not only improve the detection efficiency compared with visual method, but also reduce the error caused by human factors, providing a more reliable and accurate means for metal plate oil stain detection. At present, in order to ensure the accuracy and consistency of metal plate oil stain detection, various countries and industry organizations have formulated corresponding detection standards and specifications. These standards and specifications cover the selection of detection methods, the execution of detection steps, the determination of detection results, etc., providing clear guidance and basis for metal plate oil stain detection. At the same time, the formulation of these standards and specifications also promotes the further development and improvement of metal plate oil stain detection technology. However, there are still some problems in the existing technology, such as the high price of infrared spectroscopy instruments, the high requirement for the professional knowledge of the operator; the need for professional equipment and technical personnel for electron microscope detection, the complexity of operation, the high cost of detection, and the small detection range and low detection efficiency; the high cost of hyperspectral camera equipment, the complexity of data processing, the need for professional software and technical personnel for operation and analysis, etc.

[0005] In order to solve the problems existing in the foregoing technology, visual detection technologies based on traditional image processing have also appeared in the prior art, such as a gray threshold segmentation method: converting a collected metal plate surface image into a gray image, setting a fixed threshold according to the difference between the gray values of the oil stain area and the background area, and judging the pixels with a gray value higher or lower than the threshold as oil stain pixels, and then extracting the oil stain area; although the algorithm is simple and the calculation speed is fast, the selection of the threshold depends on experience, and for the case that the light is uneven and the gray value of the oil stain is close to the gray value of the background, the segmentation effect is poor, and misjudgment and omission are prone to occur, so it is difficult to adapt to complex industrial production environments. Therefore, an edge detection method has appeared: using edge detection operators such as Sobel and Canny to detect the areas with sharp changes in gray value in the image, since the oil stain area usually has obvious edges at the junction with the clean metal surface, the oil stain contour is outlined by identifying these edges, which provides a basis for further analyzing the oil stain area, shape and other parameters; although the edge detection method can reduce the dependence on experience and misjudgment and omission compared with the gray threshold segmentation method, it is also sensitive to noise, and scratches, stains and other interference factors on the metal plate surface are easily misjudged as oil stain edges, and the edge detection accuracy is greatly reduced in a low-contrast scene. Practical new type content

[0006] According to the deficiencies of the prior art, the utility model provides a metal plate surface detection device based on machine vision which is simple in structure, high in detection efficiency and precision, and strong in adaptability.

[0007] The utility model is such a realization that: including frame, still including conveying mechanism, detection mechanism, lifting mechanism, controller, conveying mechanism, detection mechanism and lifting mechanism are electric connection with controller respectively, the controller judges the oil stain condition of metal plate surface according to the detection image of detection mechanism and exports the judgment result;

[0008] The conveying mechanism includes a conveyor belt, a transmission assembly I and a motor I, the conveyor belt is symmetrically provided with two roots and is rotationally arranged at the top of the rack on both sides, a plurality of hanging rods for hanging metal plates are supported on the two conveyor belts at the top of the rack along the moving direction, the motor I is fixedly arranged at the lower part of the rack, and the transmission assembly I is connected with the output shaft of the motor I and the conveyor belt to drive the rotation and movement of the conveyor belt.

[0009] The lifting mechanism includes a lifting bracket, a sliding frame, a sliding plate, a clamping assembly and a lifting assembly, the lifting bracket is vertically fixed on the outer side of the two conveyor belts at the top of the rack, the sliding frame is symmetrically fixed on the inner side of the two lifting brackets, the sliding plate is slidingly arranged on the sliding frame, the clamping assembly is symmetrically fixed on the corresponding sliding plate on both sides and can clamp the two ends of the hanging rod, and the lifting assembly is arranged on the lifting bracket and connected with the two sliding plates at the driving end to drive the sliding plate to move up and down.

[0010] The detection mechanism is arranged in front of and behind the lifting mechanism in the moving direction of the conveying belt, the camera lens of the detection mechanism is directed to the surface of the metal plate lifted by the lifting mechanism, and the camera is electrically connected with the controller.

[0011] Further, the clamping assembly comprises a telescopic rod and a clamping block, the telescopic rod is fixedly arranged on the sliding plate, the clamping block is fixedly arranged on the telescopic end of the telescopic rod away from the sliding plate, a clamping groove capable of embedding the end of the suspension rod is formed in the end of the clamping block away from the telescopic rod, and the bottom of the sliding frame is fixedly provided with a limiting block capable of abutting against the sliding plate.

[0012] Further, the lifting assembly comprises a motor II, a transmission assembly II, a bevel gear I, a bevel gear II and a rotating shaft II, the motor II is fixedly arranged at the top end of the lifting support, the rotating shaft II is rotatably arranged at the top end of the lifting support, the bevel gear I is fixedly connected with the motor shaft of the motor II, the bevel gear II is fixedly arranged at one end of the rotating shaft II and engaged with the bevel gear I, and the transmission assembly II is connected with the rotating shaft II and the sliding plate respectively to drive the sliding plate to move up and down.

[0013] Further, the transmission assembly I and the transmission assembly II are chain transmission pairs respectively, and the controller is an industrial computer, a PC or other special programmable control device.

[0014] Further, the lifting mechanism further comprises a support rod and a position sensor, the support rod is fixedly arranged at the lower part of the front end or the rear end of the lifting support, and the position sensor is fixedly arranged on the support rod between the two lifting supports and electrically connected with the controller.

[0015] Further, the detection mechanism further comprises a light source and a detection support, the detection support is arranged in front of and behind the lifting mechanism in the moving direction of the conveying belt, the two bottom ends of the detection support are fixedly connected with the racks outside the conveying belt respectively, the camera is fixedly arranged on the cross bar of the detection support, the light source is fixedly arranged on the other cross bar of the detection support above the camera, and the camera and the light source are electrically connected with the controller respectively.

[0016] Further, a plurality of regularly arranged protrusions are arranged along the length direction on the conveying belt, gaps capable of supporting the suspension rods are left between the protrusions, and the suspension rods are supported in the corresponding gaps of the two conveying belts.

[0017] Further, the sliding frame is provided with a longitudinally extending sliding groove, the sliding plate is provided with a sliding block, and the sliding block is slidingly arranged in the sliding groove.

[0018] Further, the slide plate is fixedly provided with a connecting rod extending to the outside of the lifting support, and the driving end of the lifting assembly is connected with the corresponding connecting rod on the slide plate to drive the slide plate to move up and down.

[0019] Compared with the prior art, the utility model has the beneficial effects that:

[0020] 1、The utility model discloses a conveying mechanism, lifting mechanism and detection mechanism are all with controller electric connection can realize the automatic conveying of metal plate, lifting and detection can improve detection efficiency and consistency, and the clamping assembly of lifting mechanism can stably hold the suspension rod, and cooperation lifting assembly can drive the slide plate to move up and down realizes the stable lifting of metal plate, and the cooperation of position sensor and controller can accurately control the position of metal plate, can ensure the consistency and stability of detection process, and reduces artificial operation error, and detection mechanism is arranged in the lifting mechanism before and after the moving direction of conveyer belt, and the camera lens is directly opposite metal plate, and cooperation light source can obtain the clear front and back surface image of metal plate to facilitate subsequent detection analysis, finally realizes the continuous automation of detection process, greatly improves detection efficiency simultaneously, also reduces the demand of manual intervention, and therefore is especially suitable for the detection of industrial assembly line environment.

[0021] 2、Compared with infrared spectrum method, electron microscope detection method, hyperspectral camera detection method and the like in the prior art, the utility model not only has relatively low equipment cost, but also can reach higher detection precision and efficiency, has better cost benefit, and moreover, automatic detection reduces manpower cost and time cost, improves production efficiency, is favorable for the large -scale application of industrial production.

[0022] In conclusion, the utility model discloses the design of innovative automatic device, solves the pain point of low precision, high cost and dependence on manual of traditional detection method, realizes the efficient, accurate, economic detection of metal plate surface oil stain, provides reliable technical support for improving industrial product quality and production intelligent level. ACCURACY

[0023] Figure 1 It is the structural diagram of the detection device of the utility model;

[0024] Figure 2 It is the front view of Figure 1 ;

[0025] Figure 3 It is the left view of Figure 1 ;

[0026] Figure 4 It is the structure enlarged view of the slide of the utility model and the connecting component;

[0027] Figure 5The enlarged view of the clamping assembly structure of the utility model;

[0028] Figure 6 The enlarged view of the lifting assembly structure of the utility model;

[0029] In the figure: 1 - frame, 2 - conveying mechanism, 21 - conveying belt, 22 - transmission assembly I, 23 - motor I, 24 - suspension rod, 25 - protrusion, 3 - detection mechanism, 31 - camera, 32 - light source, 33 - detection support, 4 - lifting mechanism, 41 - lifting support, 42 - sliding frame, 421 - sliding groove, 43 - sliding plate, 431 - sliding block, 44 - clamping assembly, 441 - telescopic rod, 442 - clamping block, 443 - clamping groove, 444 - limiting block, 45 - lifting assembly, 451 - motor II, 452 - transmission assembly II, 453 - bevel gear I, 454 - bevel gear II, 455 - rotating shaft II, 46 - support rod, 47 - position sensor, 48 - connecting rod, 5 - metal plate. DETAILED DESCRIPTION

[0030] The utility model makes further explanation in combination with the drawings and examples, but does not add any way to the utility model with limit, any change or improvement based on the utility model teaching, all belong to the protection scope of the utility model.

[0031] As Figures 1 to 6 The utility model discloses a metal plate surface oil stain detection device, including frame 1, still include conveying mechanism 2, detection mechanism 3, lifting mechanism 4, controller, conveying mechanism 2, detection mechanism 3 and lifting mechanism 4 are electrically connected with controller respectively, the controller judges the oil stain condition on the surface of metal plate according to the detection image of detection mechanism 3 and exports the judgment result.

[0032] Conveying mechanism 2 includes conveying belt 21, transmission assembly I 22, motor I 23, the conveying belt 21 is symmetrically provided with two and is rotationally arranged in the top both sides of frame 1, the top both sides of frame 1 are supported with a number of the suspension rod 24 that can hang metal plate 5 on conveying belt 21 along the direction of movement interval, motor I 23 is fixedly arranged in the lower part of frame 1, transmission assembly I 22 is connected with the output shaft of motor I 23 and conveying belt 21 to drive the rotation of conveying belt 21 to move respectively.

[0033] The lifting mechanism 4 comprises lifting supports 41, a sliding frame 42, sliding plates 43, clamping assemblies 44 and lifting assemblies 45. The lifting supports 41 are vertically fixed outside the two conveying belts 21 at the top end of the rack 1 respectively. The sliding frame 42 is provided with two symmetrically fixed inside the two lifting supports 41. The sliding plates 43 are slidingly arranged on the sliding frame 42. The clamping assemblies 44 are symmetrically fixed on the corresponding sliding plates 43 on both sides and can clamp the two ends of the hanging rod 24. The lifting assemblies 45 are arranged on the lifting supports 41 and the driving ends thereof are connected with the two sliding plates 43 respectively to drive the sliding plates 43 to move up and down.

[0034] The detection mechanism 3 is arranged in front of and behind the lifting mechanism 4 in the moving direction of the conveying belt 21. The camera 31 of the detection mechanism 3 is directed to the surface of the metal plate 5 lifted by the lifting mechanism 4. The camera 31 is electrically connected with the controller.

[0035] The clamping assembly 44 comprises telescopic rods 441 and clamping blocks 442. The telescopic rods 441 are fixedly arranged on the sliding plates 43. The clamping blocks 442 are fixedly arranged on the telescopic ends of the telescopic rods 441 away from the sliding plates 43. The clamping blocks 442 are provided with clamping grooves 443 at the ends away from the telescopic rods 441, which can embed the end of the hanging rod 24. The bottom of the sliding frame 42 is fixedly provided with limiting blocks 444 which can abut against the sliding plates 43.

[0036] The lifting assembly 45 comprises a motor II 451, a transmission assembly II 452, bevel gears I 453 and II 454 and a rotating shaft II 455. The motor II 451 is fixedly arranged at the top end of the lifting support 41. The rotating shaft II 455 is rotatably arranged at the top end of the lifting support 41. The bevel gear I 453 is fixedly connected with the motor shaft of the motor II 451. The bevel gear II 454 is fixedly arranged at one end of the rotating shaft II 455 and engaged with the bevel gear I 453. The transmission assembly II 452 is connected with the rotating shaft II 455 and the sliding plates 43 respectively to drive the sliding plates 43 to move up and down.

[0037] The transmission assembly I 22 and the transmission assembly II 452 are chain transmission pairs respectively. The controller is an industrial computer, a PC or other special programmable control device.

[0038] The lifting mechanism 4 further comprises support rods 46 and position sensors 47. The support rods 46 are fixedly arranged at the lower part of the front end or the rear end of the lifting support 41. The position sensors 47 are fixedly arranged on the support rods 46 between the two lifting supports 41. The position sensors 47 are electrically connected with the controller.

[0039] The detection mechanism 3 further comprises a light source 32 and a detection bracket 33, the detection bracket 33 is arranged in front of and behind the lifting mechanism 4 in the moving direction of the conveying belt 21, the two side bottom ends of the detection bracket 33 are fixedly connected with the rack 1 outside the conveying belt 21, the camera 31 is fixedly arranged on the horizontal rod of the detection bracket 33, the light source 32 is fixedly arranged on the other horizontal rod of the detection bracket 33 above the camera 31, and the camera 31 and the light source 32 are electrically connected with the controller.

[0040] The conveying belt 21 is provided with a plurality of regularly arranged protrusions 25 along the length direction, gaps for supporting the hanging rods 24 are formed between the protrusions 25, and the two sides of the hanging rod 24 are supported in the corresponding gaps of the two conveying belts 21. The arrangement of the protrusions 25 can ensure that the hanging rod 24 does not deviate during movement, and ensure that the lifting mechanism 4 can accurately lift the hanging rod 24 so that the detection mechanism 3 can take pictures.

[0041] The sliding frame 42 is provided with a longitudinally extending sliding groove 421, and the sliding plate 43 is provided with a sliding block 431 which is slidingly arranged in the sliding groove 421.

[0042] The sliding plate 43 is fixedly provided with a connecting rod 48 extending to the outside of the lifting bracket 41, and the driving ends of the lifting assemblies 45 are connected with the corresponding connecting rods 48 on the two sliding plates 43 to drive the sliding plates 43 to move up and down.

[0043] The model of the camera 31 is MV-GEF1205GC, and the lens model is MV-LD-16-5M-F, and the light source 32 is a ring light source with the model of MV-HLH70R / G / B / W / 90.

[0044] The working principle and working process of the utility model:

[0045] As shown in the drawings, Figures 1 to 6 When working, the metal plate 5 to be detected is hung on the hanging rod 24, the conveying belt 21 drives the hanging rod 24 to move, when the hanging rod 24 reaches the limited position of the lifting mechanism 4, the position sensor 47 senses the hanging rod 24 and transmits a signal to the clamping assembly 44, the clamping assembly 44 clamps the hanging rod 24, the clamping groove 443 clamps the end of the hanging rod 24, the hanging rod 24 is limited to prevent slipping to prevent falling, then the motor II 451 drives the bevel gear I 453 to rotate and drives the bevel gear II 454 to rotate, so that the rotating shaft II 455 drives the sliding plate 43 to rise to the limited position through the transmission assembly II 452, at this time, the camera 31 of the detection mechanism 3 takes pictures of the front and rear surfaces of the metal plate 5, then the controller judges the oil stain condition of the surface of the metal plate 5 according to the image and outputs the judgment result, and when the sliding frame 42 falls after detection, the limiting block 444 can limit the position.

[0046] The above merely describes a preferred embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A machine vision based metal sheet surface inspection apparatus comprising a frame (1), characterized in that: Also include conveying mechanism (2), detection mechanism (3), lifting mechanism (4), controller, the conveying mechanism (2), detection mechanism (3) and lifting mechanism (4) are electrically connected with controller respectively, the controller judges the oil stain condition on the surface of metal plate (5) according to the detection image of detection mechanism (3) and outputs the judgment result; The conveying mechanism (2) includes a conveyor belt (21), a transmission assembly I (22), a motor I (23), the conveyor belt (21) is symmetrically provided with two and is rotatably arranged at the top of the rack (1) on both sides, a plurality of hanging rods (24) capable of hanging metal plates (5) are supported on the two conveyor belts (21) at the top of the rack (1) along the moving direction, the motor I (23) is fixedly arranged at the lower part of the rack (1), the transmission assembly I (22) is connected with the output shaft of the motor I (23) and the conveyor belt (21) to drive the conveyor belt (21) to rotate and move respectively; The lifting mechanism (4) includes a lifting bracket (41), a sliding frame (42), a sliding plate (43), a clamping assembly (44) and a lifting assembly (45), the lifting bracket (41) is vertically fixed outside the two conveyor belts (21) at the top of the rack (1) respectively, the sliding frame (42) is provided with two and is symmetrically fixed inside the two lifting brackets (41), the sliding plate (43) is slidably arranged on the sliding frame (42), the two clamping assemblies (44) are symmetrically fixed on the corresponding sliding plates (43) on both sides and can clamp the two ends of the hanging rod (24), the lifting assembly (45) is arranged on the lifting bracket (41) and the driving end is connected with the two sliding plates (43) respectively to drive the sliding plates (43) to move up and down; The detection mechanism (3) is arranged in front of and behind the lifting mechanism (4) in the moving direction of the conveyor belt (21), the camera (31) lens of the detection mechanism (3) directly faces the surface of the metal plate (5) lifted by the lifting mechanism (4), and the camera (31) is electrically connected with the controller.

2. The metal sheet surface inspection apparatus based on machine vision according to claim 1, characterized in that: The clamping assembly (44) includes a telescopic rod (441) and a clamping block (442), the telescopic rod (441) is fixedly arranged on the sliding plate (43), the clamping block (442) is fixedly arranged on the telescopic end of the telescopic rod (441) away from the sliding plate (43), one end of the clamping block (442) away from the telescopic rod (441) is provided with a clamping groove (443) capable of embedding the end of the hanging rod (24), and the bottom of the sliding frame (42) is fixedly provided with a limiting block (444) capable of abutting against the sliding plate (43).

3. The metal sheet surface inspection apparatus based on machine vision according to claim 1, characterized in that: The lifting assembly (45) comprises a motor II (451), a transmission assembly II (452), a bevel gear I (453), a bevel gear II (454) and a rotating shaft II (455). The motor II (451) is fixedly arranged at the top end of the lifting support (41). The rotating shaft II (455) is rotatably arranged at the top end of the lifting support (41). The bevel gear I (453) is fixedly connected with the motor shaft of the motor II (451). The bevel gear II (454) is fixedly arranged at one end of the rotating shaft II (455) and is engaged with the bevel gear I (453). The transmission assembly II (452) is connected with the rotating shaft II (455) and the sliding plate (43) respectively to drive the sliding plate (43) to move up and down.

4. The metal sheet surface inspection apparatus based on machine vision according to claim 3, characterized in that: The transmission assembly I (22) and the transmission assembly II (452) are chain transmission pairs respectively. The controller is an industrial computer, a PC or other special programmable control device.

5. The metal sheet surface inspection apparatus based on machine vision according to claim 1, characterized in that: The lifting mechanism (4) further comprises a support rod (46) and a position sensor (47). The support rod (46) is fixedly arranged at the lower part of the front end or the rear end of the lifting support (41). The position sensor (47) is fixedly arranged on the support rod (46) between the two lifting supports (41). The position sensor (47) is electrically connected with the controller.

6. The metal sheet surface inspection apparatus based on machine vision according to claim 1, characterized in that: The detection mechanism (3) further comprises a light source (32) and a detection support (33). The detection support (33) is arranged in front of and behind the lifting mechanism (4) in the moving direction of the conveying belt (21). The bottom ends of the two sides of the detection support (33) are fixedly connected with the rack (1) outside the conveying belt (21). The camera (31) is fixedly arranged on the cross bar of the detection support (33). The light source (32) is fixedly arranged on the other cross bar of the detection support (33) above the camera (31). The camera (31) and the light source (32) are electrically connected with the controller respectively.

7. The metal sheet surface inspection apparatus based on machine vision according to claim 1, characterized in that: A plurality of regularly arranged protrusions (25) are arranged along the length direction on the conveying belt (21). The protrusions (25) are provided with gaps that can hold the suspension rods (24). The suspension rods (24) are held on the corresponding gaps of the two conveying belts (21).

8. The metal sheet surface inspection apparatus based on machine vision according to claim 1, characterized in that: The sliding frame (42) is provided with a longitudinally extending sliding groove (421). The sliding plate (43) is provided with a sliding block (431). The sliding block (431) is slidingly arranged in the sliding groove (421).

9. The metal sheet surface inspection apparatus based on machine vision according to any one of claims 1 to 8, characterized in that: A connecting rod (48) extending to the outside of the lifting support (41) is fixedly arranged on the sliding plate (43). The driving ends of the lifting assembly (45) are connected with the corresponding connecting rods (48) on the two sliding plates (43) to drive the sliding plates (43) to move up and down.

Images