External thread quality detection device

Abstract

The invention provides an external thread quality detection device, and relates to the field of detection, and the detection device comprises a housing which is internally provided with a containing cavity, the housing is provided with an opening communicated with the containing cavity, and the opening is used for allowing a to-be-detected stud to extend into the containing cavity; the camera shooting assembly is connected with the inner wall of the containing cavity, and the camera shooting assembly is located on at least one side of the central axis of the opening; the light source assembly is fixed to the inner wall of the containing cavity. The detection device has a small view blind area, so that the identification accuracy of the external thread surface defects is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of detection, in particular to a detection device for external thread quality. BACKGROUND

[0002] After the stud is processed, the quality of the external thread of the stud needs to be detected to confirm whether there is a defect on the surface of the external thread, such as surface cracks or splashed adhered slag. If observed by artificial observation, the detection efficiency will be reduced, and the detection needs to be detected by a detection device.

[0003] In related detection devices, machine vision recognition is performed by acquiring an image of the surface of the external thread, but the recognition accuracy of such devices for defects is low. SUMMARY

[0004] The present application provides a detection device for thread quality, which is used to solve the technical problem of how to improve the recognition accuracy of defects on the external surface of the thread.

[0005] The present application provides a detection device for thread quality, which is used to solve the technical problem of how to improve the recognition accuracy of defects on the external surface of the thread.

[0006] In some embodiments, the camera assembly includes a plurality of cameras, each of which is connected to the inner wall and is arranged at intervals around the central axis.

[0007] In some embodiments, each camera is rotationally connected to the inner wall, and the rotation axis of each camera is perpendicular to the central axis.

[0008] In some embodiments, the at least two cameras form a camera group, each camera forms a plurality of camera groups, and each camera group is arranged at intervals around the central axis; in one camera group, a plurality of cameras are arranged at intervals in a direction parallel to the central axis, and adjacent cameras form a first included angle, which is the same as the included angle between the upper surface and the lower surface of the thread of the stud.

[0009] In some embodiments, the camera assembly is slidingly connected to the inner wall, and the camera assembly can slide relative to the inner wall in a direction parallel to the central axis.

[0010] In some embodiments, the camera assembly is slidably connected to the inner wall so that the camera assembly can rotate relative to the inner wall of the accommodating cavity, and the rotation axis of the camera assembly coincides with the central axis.

[0011] In some embodiments, the lighting assembly includes a plurality of lighting devices, and the camera device and the lighting devices are spaced apart in a direction surrounding the central axis.

[0012] In some embodiments, the shell is a polygonal prism, the opening is located at the bottom of the polygonal prism, the inner side wall of the polygonal prism includes a camera inner wall and a lighting inner wall, and the camera inner wall and the lighting inner wall are arranged at intervals; wherein, the lighting device is fixed to the camera inner wall, and the lighting device is fixed to the lighting inner wall.

[0013] In some embodiments, the angles between the illumination inner walls and the imaging inner wall on both sides of the imaging inner wall are the same.

[0014] In some embodiments, the area of ​​the illuminated inner wall is larger than the area of ​​the imaged inner wall.

[0015] An embodiment of the present invention provides a device for detecting the quality of external threads, which includes a shell having an internal accommodating cavity and an opening connected to the accommodating cavity, a camera assembly connected to the inner wall of the accommodating cavity and located on at least one side of the central axis of the opening. By arranging the camera assembly on the side of the central axis, after the stud to be inspected is extended into the accommodating cavity from the opening, the camera assembly is located on the side perpendicular to the length direction of the stud, so that the camera assembly will not be blocked by the threads of the external thread, so that the upper and lower surfaces of the external thread can be photographed at the same time, reducing the blind spot of the field of view of the detection device, thereby improving the detection device's recognition accuracy of surface defects of the external thread; at the same time, the detection device also includes a light source assembly located in the accommodating cavity, which is used to provide lighting for the accommodating cavity, so that the camera assembly can capture an image of the external thread with sufficient brightness and clarity, further improving the detection device's recognition accuracy of surface defects of the external thread. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a device for detecting the quality of external threads provided by an embodiment of the present invention; Figure 2 A schematic diagram of the relative positional relationship between a camera device and a lighting device in an apparatus for detecting external thread quality provided by an embodiment of the present invention; Figure 3 A schematic diagram of the relative positional relationship between the camera group and the housing in the external thread quality detection device provided by an embodiment of the present invention; Figure 4Another structure schematic diagram of the external thread quality detection device provided by the embodiment of the present application is provided.

[0017] Explanation of reference numerals 10, housing; 11, accommodating cavity; 12, opening; 13, camera inner side wall; 14, illumination inner side wall; 20, camera assembly; 21, camera device; 22, camera group; 30, illumination assembly; 31, illumination device. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described in detail below with reference to the drawings and specific embodiments.

[0019] In the specific embodiments, each specific technical feature in each of the various embodiments described can be combined in various combinations, for example, different specific technical features can form different embodiments through combination, in order to avoid unnecessary repetition, various possible combinations of each specific technical feature in the present application are not described again.

[0020] Here, it also needs to be explained that, in order to avoid the present application being obscured by unnecessary details, only the structures and / or processing steps closely related to the scheme of the present application are shown in the drawings, and other details not closely related to the present application are omitted.

[0021] In addition, it also needs to be explained that the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. In the following description, the terms "first\second\..." are only used to distinguish different objects, and do not mean that the objects have the same or relationship. It should be understood that the positions described by the terms "above", "below", "inner", "outer" and other positional nouns are the positions in the normal use state.

[0022] The thread quality detection device provided in the following specific embodiments can be used to detect any external thread screw structure, which can be a separate part such as a screw or a bolt, or a connecting part or a transmission part with external threads on other devices. The structure and function of the thread quality detection device will be described in examples in combination with the embodiments.

[0023] In some embodiments, as Figure 1As shown, the detection device comprises a shell 10, a camera assembly 20 and a light source assembly 30, the shell 10 has a containing cavity 11 inside, and the shell 10 has an opening 12 for the stud to be detected to extend into the containing cavity 11; the camera assembly 20 is connected with the inner wall of the containing cavity 11, and the camera assembly 20 is located at least one side of the central axis of the opening 12, which can be understood as, in the state that the stud to be detected extends into the containing cavity 11 through the opening 12, the camera assembly 20 is located at the side of the stud in the direction perpendicular to the length direction of the stud, for the convenience of description, the length direction of the stud provided below is called the vertical direction, and the direction perpendicular to the vertical direction is called the horizontal direction, by setting the camera assembly 20 at the side of the stud in the horizontal direction, the camera assembly 20 can simultaneously capture the upper surface and the lower surface of the external thread of the stud, if the camera assembly 20 is set on the top surface or the bottom surface of the containing cavity 11, due to the shielding effect of the thread, the camera assembly 20 can only capture the upper surface of the thread or only capture the lower surface of the thread, thereby causing the detection device to have a blind area of at least 50%, if the surface defect of the thread is located in the blind area, the detection device cannot identify the defect at this position, thereby reducing the identification accuracy of the detection device for defects, and the detection device provided in the application sets the camera assembly 20 at one side of the stud in the horizontal direction, thereby being able to simultaneously obtain the upper surface and the lower surface of the external thread of the stud, thereby greatly reducing the visual blind area of the detection device and improving the identification accuracy of the detection device for the surface defects of the external thread. Optionally, the camera assembly 20 can only include one camera device, by making the camera device rotate and slide relative to the stud, thereby making the camera device be able to capture different parts of the external thread of the stud, the relative movement can be realized by the relative movement of the stud and the shell, and the relative movement can also be realized by the movement of the camera device relative to the shell.

[0024] At the same time, the light source assembly 30 is fixed to the inner wall of the shell 10, for providing illumination for the stud in the containing cavity 11, so that the camera assembly 20 can capture images with sufficient brightness and sufficient clarity, thereby further improving the identification accuracy of the detection device for the surface defects of the external thread.

[0025] An embodiment of the present invention provides a device for detecting the quality of external threads, which includes a shell having an internal accommodating cavity and an opening connected to the accommodating cavity, a camera assembly connected to the inner wall of the accommodating cavity and located on at least one side of the central axis of the opening. By arranging the camera assembly on the side of the central axis, after the stud to be inspected is extended into the accommodating cavity from the opening, the camera assembly is located on the side perpendicular to the length direction of the stud, so that the camera assembly will not be blocked by the threads of the external thread, so that the upper and lower surfaces of the external thread can be photographed at the same time, reducing the blind spot of the field of view of the detection device, thereby improving the detection device's recognition accuracy of surface defects of the external thread; at the same time, the detection device also includes a light source assembly located in the accommodating cavity, which is used to provide lighting for the accommodating cavity, so that the camera assembly can capture an image of the external thread with sufficient brightness and clarity, further improving the detection device's recognition accuracy of surface defects of the external thread.

[0026] In some embodiments, as Figure 2 As shown, the camera assembly 20 includes a plurality of camera devices 21, each of which is connected to the inner wall of the accommodating cavity 11, and each of the camera devices 21 is arranged at intervals around the central axis of the opening 12. When the stud to be inspected extends into the accommodating cavity 11 from the opening 12, the plurality of camera devices 21 surround the outside of the stud, thereby being able to obtain images of different sides of the external thread from different angles, thereby eliminating the need to rotate the camera device 21 relative to the stud to obtain images of the external thread on different sides of the stud, thereby improving the detection efficiency of the detection device. It should be noted that the number and setting position of the camera devices 21 are related to the lens wide angle of the camera device 21. The sum of the lens wide angles of each camera device 21 needs to be at least 360 degrees, so that the detection device can capture images of different sides of the external thread without blind spots. For example, the lens wide angle of each camera device 21 is 120 degrees, and the number of camera devices 21 is 3. In the horizontal cross section, each camera device 21 forms an angle of 120 degrees with the vertical line connecting the central axis.

[0027] In some embodiments, as Figure 2As shown, each camera 21 is rotationally connected with the inner wall, and the rotation axis of each camera 21 is perpendicular to the central axis. It can be understood that each camera 21 can produce a yawing motion relative to the inner wall. By yawing the camera 21, the orientation of the lens of the camera 21 can be adjusted. It should be noted that if the lens of the camera 21 is not oriented correctly to the surface of the external thread, the upper surface or the lower surface of the external thread obtained by shooting will be distorted in shape due to the angle inclination. In order to avoid the influence of shape distortion on surface defects, the obtained image needs to be corrected by linearity correction, which will affect the detection efficiency. By setting the camera 21 to be able to yaw relative to the inner wall, the lens of the camera 21 can be directed to the upper surface or the lower surface of the external thread, thereby reducing the shape distortion of the external thread surface image obtained by the camera 21. In the subsequent machine vision recognition process, the linearity correction process is saved, and the detection efficiency of the external surface defects is improved.

[0028] In some embodiments, as Figure 3 As shown, the camera assembly 20 includes a plurality of camera groups 22, each camera group 22 is arranged at intervals around the central axis of the opening 12, so that the images of different sides of the external thread of the stud can be obtained by each camera group 22. Each camera group 22 includes a plurality of cameras 21. The cameras 21 in the same camera group 22 are arranged at intervals in a direction parallel to the central axis of the opening 12, and the orientations of the adjacent two cameras 21 in the same camera group 22 form a first included angle, which is the same as the included angle between the upper surface and the lower surface of the same thread of the external thread of the stud. It can be understood that, in the state that the stud extends into the receiving cavity 11 through the opening 12, at least one of the cameras 21 in the same camera group 22 can be directed to the upper surface of the external thread, and at least one of the cameras 21 can be directed to the lower surface of the external thread, so that the images of the lower surface and the upper surface of the external thread without shape distortion can be obtained at one time, thereby eliminating the need to repeatedly adjust the orientation of the camera 21 during detection, and further improving the detection efficiency of the external thread quality detection. Optionally, each camera 21 is rotationally connected with the inner wall of the receiving cavity 11, and the rotation axis of each camera 21 is perpendicular to the central axis of the opening 12, so that the first included angle of the orientations of the adjacent cameras 21 can be adjusted by yawing the cameras 21 relative to the inner wall. In the case of detecting different models of external threads, the first included angle is adjusted to a state suitable for the external thread by yawing the cameras 21, thereby improving the versatility of the detection device.

[0029] In some embodiments, as Figure 2As shown, the camera assembly 20 is in sliding connection with the inner wall of the accommodating cavity 11, and the camera assembly 20 can slide relative to the inner wall of the accommodating cavity 11 in a direction parallel to the central axis of the opening 12. In the state where the stud to be detected extends into the accommodating cavity 11 through the opening 12, the camera assembly 20 can slide relative to the length direction of the stud through the sliding of the camera assembly 20, so that the camera assembly 20 can capture images of the external thread at different heights of the stud. Optionally, the camera assembly 20 includes a plurality of camera devices 21, each of which can slide relative to the inner wall of the accommodating cavity 11 as a whole, or each of which can independently slide relative to the inner wall of the accommodating cavity 11.

[0030] In some embodiments, as shown in Figure 2 As shown, the camera assembly 20 is in sliding connection with the inner wall of the accommodating cavity 11, and the camera assembly 20 can slide relative to the inner wall of the accommodating cavity 11 in a direction parallel to the central axis of the opening 12. In the state where the stud to be detected extends into the accommodating cavity 11 through the opening 12, the camera assembly 20 can slide relative to the length direction of the stud through the sliding of the camera assembly 20, so that the camera assembly 20 can capture images of the external thread at different heights of the stud. Optionally, the camera assembly 20 includes a plurality of camera devices 21, each of which can slide relative to the inner wall of the accommodating cavity 11 as a whole, or each of which can independently slide relative to the inner wall of the accommodating cavity 11.

[0031] In some embodiments, as shown in Figure 2 As shown, the camera assembly 20 is in sliding connection with the inner wall of the accommodating cavity 11, and the camera assembly 20 can slide relative to the inner wall of the accommodating cavity 11 in a direction parallel to the central axis of the opening 12. In the state where the stud to be detected extends into the accommodating cavity 11 through the opening 12, the camera assembly 20 can slide relative to the length direction of the stud through the sliding of the camera assembly 20, so that the camera assembly 20 can capture images of the external thread at different heights of the stud. Optionally, the camera assembly 20 includes a plurality of camera devices 21, each of which can slide relative to the inner wall of the accommodating cavity 11 as a whole, or each of which can independently slide relative to the inner wall of the accommodating cavity 11.

[0032] In some embodiments, as shown in Figure 4As shown, the shell 10 is a polygonal prism, that is, the shell 10 comprises a top wall, a bottom wall and a plurality of side walls between the top and the bottom, the adjacent side walls form a certain included angle and the adjacent side walls form a ridge, wherein the opening 12 is located at the bottom of the shell 10, the top wall, the bottom wall and the side walls form a containing cavity 11, the part of the side wall adjacent to the containing cavity 11 is an inner side wall, different inner side walls are respectively used to install different components, in order to facilitate the following distinction, the inner side walls used to install different components are respectively called the camera inner wall 13 and the lighting inner wall 14, the camera inner wall 13 is used to install the camera device 21, and the lighting inner wall 14 is used to install the lighting device 31, in the direction around the central axis of the opening 12, the camera inner wall 13 and the lighting inner wall 14 are arranged at intervals, it should be noted that the camera inner wall 13 and the lighting inner wall 14 are both planes, by arranging the camera inner wall 13 and the lighting inner wall 14 at intervals, the camera device 21 and the lighting device 31 can be arranged at intervals around the central axis of the opening 12, and the installation of the camera device 21 and the lighting device 31 is more convenient and reliable.

[0033] In some embodiments, as shown in Figure 4 As shown, the included angles between the lighting inner walls 14 on both sides of the camera inner wall 13 are the same, so that the two lighting devices 31 fixed to the two lighting inner walls 14 can illuminate the outer thread at the same angle on both sides of the camera device 21, the illumination of one side of the lighting device 31 forms a shadow on the other side, which is just illuminated by the lighting device 31 on the other side, thereby minimizing the shadow formed on the surface of the outer thread by the illumination, further reducing the influence of the shadow in the image on the identification of the surface defects, and further improving the identification accuracy of the surface defects of the outer thread.

[0034] In some embodiments, as shown in Figure 4 As shown, the area of the lighting inner wall 14 is greater than the area of the camera inner wall 13, it can be understood that in order to provide sufficient illumination for the outer thread, the size of the lighting device 31 is greater than the size of the camera device 21, so that the area of the lighting inner wall 14 is set to be greater than the area of the camera inner wall 13, thereby providing sufficient installation space for the lighting device 31.

[0035] The above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application, although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A device for detecting the quality of external threads, characterized in that: The detection device comprises: A housing having an accommodating cavity therein, and the housing having an opening communicating with the accommodating cavity, the opening being used for allowing the stud to be tested to extend into the accommodating cavity; a camera assembly connected to the inner wall of the accommodating cavity, the camera assembly being located on at least one side of the central axis of the opening; The light source assembly is fixed to the inner wall of the accommodating cavity.

2. The detection device according to claim 1, characterized in that The camera assembly includes a plurality of camera devices, each of which is connected to the inner wall and is arranged at intervals around the central axis.

3. The detection device according to claim 2, characterized in that Each camera device is rotatably connected to the inner wall, and a rotation axis of each camera device is perpendicular to the central axis.

4. The detection device according to claim 2 or 3, characterized in that: The at least two camera devices form a camera group, each camera device forms a plurality of camera groups, and each camera group is arranged at intervals around the central axis; In one camera group, a plurality of camera devices are spaced apart in a direction parallel to the central axis, and adjacent camera devices are oriented to form a first angle, which is the same as the angle between the upper and lower surfaces of the thread of the stud.

5. The detection device according to claim 1, characterized in that The camera assembly is slidably connected to the inner wall, and the camera assembly can slide relative to the inner wall along a direction parallel to the central axis.

6. The detection device according to claim 1 or 5, characterized in that: The camera assembly is slidably connected to the inner wall so that the camera assembly can rotate relative to the inner wall of the accommodating cavity, and the rotation axis of the camera assembly coincides with the central axis.

7. The detection device according to claim 2, characterized in that The lighting assembly includes a plurality of lighting devices, and the camera device and the lighting devices are arranged at intervals in a direction surrounding the central axis.

8. The detection device according to claim 7, characterized in that The housing is a polygonal prism, the opening is located at the bottom of the polygonal prism, the inner sidewall of the polygonal prism includes an imaging inner wall and an illumination inner wall, and the imaging inner wall and the illumination inner wall are arranged at intervals; Wherein, the lighting device is fixed on the camera inner wall, and the lighting device is fixed on the lighting inner wall.

9. The detection device according to claim 8, characterized in that The included angles between the illumination inner walls and the imaging inner wall on both sides of the imaging inner wall are the same.

10. The detection device according to claim 8, characterized in that: The area of ​​the illuminated inner wall is larger than the area of ​​the imaging inner wall.

Images