Appearance detection device

Abstract

The utility model relates to the technical field of visual inspection, and discloses an appearance inspection device which comprises a first plane coaxial light source, the first plane coaxial light source comprises a light guide plate and a lamp panel arranged on the periphery of the light guide plate. A light reflecting layer is arranged on the back side surface of the light guide plate, a stripe pattern is printed on the front side surface opposite to the back side surface, and the stripe pattern comprises a plurality of lightproof strip-shaped lines which are arranged in parallel at intervals; the light reflecting layer is composed of a plurality of arc-shaped protruding points, and the arc-shaped protruding points are used for reflecting light emitted into the light guide plate from the lamp panel and enabling the light to be emitted out from the front face and the side face of the light guide plate. According to the appearance detection device disclosed by the utility model, stripe light spots can be formed on the surface of the workpiece without arranging a stripe grating plate.

Description

Technical Field

[0001] This utility model relates to the field of visual inspection technology, and in particular to an appearance inspection device. Background Technology

[0002] Visual inspection uses industrial cameras to replace human eyes in performing functions such as recognition and inspection. A typical visual inspection system consists of a camera and a light source. Visual inspection systems can effectively improve the inspection speed and accuracy of production lines, while preventing misjudgments caused by human eye fatigue.

[0003] Existing visual inspection devices generally include a light-emitting component and a camera. The light-emitting component emits light from top to bottom onto the workpiece, illuminating its surface. The camera then takes a picture of the illuminated workpiece to detect surface defects. When it is necessary to detect whether there is distortion on the workpiece surface, a striped grid plate is usually inserted between the light-emitting component and the workpiece to form striped light spots on the workpiece surface. However, the installation of the striped grid plate is not only cumbersome but also occupies installation space.

[0004] Therefore, it is necessary to design an appearance inspection device that can form striped light spots on the surface of the workpiece without the need for a striped grid plate.

[0005] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Utility Model Content

[0006] This invention provides an appearance inspection device that can form striped light spots on the surface of a workpiece without the need for a striped grid plate.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An appearance inspection device includes a first planar coaxial light source;

[0009] The first planar coaxial light source includes a light guide plate and a lamp plate disposed on the outer periphery of the light guide plate; a light reflective layer is disposed on the back side of the light guide plate, and a striped pattern is printed on the front side opposite to the back side; the striped pattern includes a plurality of opaque stripes arranged at intervals and parallel to each other.

[0010] The light-reflecting layer consists of several arc-shaped protrusions, which are used to reflect the light emitted from the lamp panel into the light guide plate and to allow the light to exit from the front and side of the light guide plate.

[0011] Optionally, at least three of the first planar coaxial light sources are provided;

[0012] All the first planar coaxial light sources are arranged in a circular array around the center line of the detection station, and the light guide plate of the first planar coaxial light source is parallel to the center line around the detection station.

[0013] Optionally, the appearance inspection device further includes a second planar coaxial light source; at least three second planar coaxial light sources are provided, and the structure of the second planar coaxial light source is the same as that of the first planar coaxial light source;

[0014] All the second planar coaxial light sources are arranged in a circumferential array around the center line of the detection station, and the light guide plate of the second planar coaxial light source is inclined relative to the center line around the detection station.

[0015] Optionally, the appearance inspection device may also include an inspection camera;

[0016] The detection camera is mounted on one side of the light guide plate with its lens facing the back side.

[0017] Optionally, the appearance inspection device also includes a coaxial light source, which is located directly above the inspection station;

[0018] The detection hole and light emission hole of the coaxial light source are spaced apart from top to bottom, and the light emission hole is directly opposite the detection station.

[0019] Optionally, the coaxial light source further includes a housing, a beam splitter, a diffuser, and a light-emitting plate;

[0020] The beam splitter, the diffuser plate, and the light-emitting plate are all installed in the housing. The light-emitting plate emits light towards the diffuser plate. The light passes through the diffuser plate, is emitted towards the beam splitter, and is reflected by the beam splitter before being emitted from the light-emitting hole towards the detection station.

[0021] Optionally, the arc-shaped protrusion has a groove that is recessed from the back side of the light guide plate toward the center of the light guide plate, and the arc-shaped edge of the groove is used to reflect the light emitted by the lamp plate into the light guide plate.

[0022] Optionally, the appearance inspection device may also include a control module;

[0023] The control module is electrically connected to each of the first planar coaxial light sources, and the control module is also electrically connected to the detection camera.

[0024] Optionally, the light board includes a circuit board and LED beads mounted on the circuit board.

[0025] Optionally, the opaque stripe pattern is a straight stripe or a serpentine stripe.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The appearance inspection device provided by this utility model has a light-reflecting layer on the back side of a light guide plate for reflecting light incident on the light guide plate, and a striped pattern on the front side of the light guide plate. Light emitted from the lamp plate is reflected by the light-reflecting layer and then strikes the striped pattern, exiting from the light-transmitting area between the opaque stripes, thereby forming striped light spots on the workpiece surface. In this embodiment, striped grid plates are not required to form striped light spots on the workpiece surface.

[0028] This invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of this invention. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is an installation diagram of the appearance inspection device provided in this embodiment of the utility model;

[0031] Figure 2 This is a schematic diagram of the striped pattern provided in an embodiment of the present utility model.

[0032] Reference numerals: 1. First plane coaxial light source; 11. Light guide plate; 12. Lamp plate; 13. Light reflection layer; 14. Striped pattern; 2. Second plane coaxial light source; 3. Detection camera; 4. Coaxial light source; 41. Housing; 42. Beam splitter; 43. Diffuser plate; 44. Light emitting plate; 100. Opaque striped pattern. Detailed Implementation

[0033] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0034] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0035] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0036] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0037] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0038] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0039] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0040] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0041] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0042] In view of the deficiencies of the existing appearance inspection devices, the applicant, based on years of practical experience and professional knowledge in the design and manufacture of such products, and in conjunction with the application of theoretical principles, actively researched and innovated in order to create a technology that could solve the deficiencies of the existing technology and make the appearance inspection device more practical. After continuous research, design, and repeated prototype production and improvement, this utility model with real practical value was finally created.

[0043] Please refer to Figures 1 to 2 This utility model provides an appearance inspection device, including a first planar coaxial light source 1; the first planar coaxial light source 1 includes a light guide plate 11 and a lamp plate 12 disposed on the outer periphery of the light guide plate 11; a light reflective layer 13 is disposed on the back side of the light guide plate 11, and a striped pattern 14 is printed on the front side opposite to the back side, the striped pattern 14 including a plurality of parallel and spaced opaque striped lines 100; the light reflective layer 13 is composed of a plurality of arc-shaped protrusions, the arc-shaped protrusions are used to reflect the light from the lamp plate 12 into the light guide plate 11, and to make the light exit from the front side of the light guide plate 11.

[0044] In this embodiment of the appearance inspection device, a light-reflecting layer 13 is provided on the back side of the light guide plate 11 to reflect the light incident on the light guide plate 11, and a striped pattern 14 is provided on the front side of the light guide plate 11. The light emitted from the lamp plate 12 is reflected by the light-reflecting layer 13 and then shines onto the striped pattern 14, exiting from the light-transmitting area between the opaque striped lines 100, thereby forming striped light spots on the workpiece surface. In this embodiment, striped light spots can be formed on the workpiece surface without the need for a striped grid plate, reducing the installation work of the striped grid plate and helping to reduce the overall size of the appearance inspection device.

[0045] Optionally, at least three first planar coaxial light sources 1 are provided; all first planar coaxial light sources 1 are arranged in a circumferential array around the center line of the detection station, and the light guide plate 11 of the first planar coaxial light sources 1 is parallel to the center line around the detection station.

[0046] Specifically, the first planar coaxial light source 1 arranged in a surrounding manner can detect whether there are surface defects on the outer peripheral surface of the workpiece under test. Generally, the number of first planar coaxial light sources 1 is not less than three and preferably not more than six. When the outer peripheral diameter of the workpiece is large, the number of first planar coaxial light sources 1 can be appropriately increased.

[0047] Optionally, the appearance inspection device further includes a second planar coaxial light source 2; at least three second planar coaxial light sources 2 are provided, and the structure of the second planar coaxial light source 2 is the same as that of the first planar coaxial light source 1; all the second planar coaxial light sources 2 are arranged in a circumferential array around the center line of the inspection station, and the light guide plate 11 of the second planar coaxial light source 2 is inclined relative to the center line of the inspection station.

[0048] Specifically, the second planar coaxial light source 2 is used to detect whether there are surface defects on the inclined surface of the top outer periphery of the workpiece under test.

[0049] Optionally, the appearance inspection device also includes an inspection camera 3; the inspection camera 3 is mounted on one side of the light guide plate 11 with its lens facing the back side. The inspection camera 3 can take pictures of the workpiece under test through the first planar coaxial light source 1, thereby knowing whether the stripe light spots on the surface of the workpiece under test are distorted or deformed, and thus determining whether the workpiece under test is qualified.

[0050] Optionally, the appearance inspection device also includes a coaxial light source 4, which is located directly above the inspection station. The detection hole and light emission hole of the coaxial light source 4 are spaced apart from top to bottom, and the light emission hole faces the inspection station. The inspection camera 3 can take pictures of the top of the workpiece to be inspected through the detection hole and the light emission hole.

[0051] Optionally, the coaxial light source 4 also includes a housing 41, a beam splitter 42, a diffuser plate 43, and a light-emitting plate 44; the beam splitter 42, the diffuser plate 43, and the light-emitting plate 44 are all installed in the housing 41, the light-emitting plate 44 emits light to the diffuser plate 43, the light passes through the diffuser plate 43 and is emitted by the beam splitter 42 and reflected by the beam splitter 42 before being emitted from the light-emitting hole to the detection station.

[0052] Optionally, the arc-shaped protrusion has a groove that extends from the back side of the light guide plate 11 to the center of the light guide plate 11, and the arc-shaped edge of the groove is used to reflect the light from the lamp plate 12 into the light guide plate 11.

[0053] Optionally, the appearance inspection device also includes a control module; the control module is electrically connected to each of the first planar coaxial light sources 1, and the control module is electrically connected to the inspection camera 3.

[0054] Specifically, the control module is used to control a first planar coaxial light source 1 and a corresponding detection camera 3 to work. After the detection camera 3 takes a picture, it controls another first planar coaxial light source 1 and a corresponding detection camera 3 to work, thereby achieving the purpose of sequential detection and avoiding different stripe light spots being projected onto the surface of the workpiece at the same time, which would affect the detection accuracy.

[0055] Optionally, the light board 12 includes a circuit board and LED beads mounted on the circuit board.

[0056] Optionally, the opaque stripe pattern 100 can be a straight stripe or a serpentine stripe.

[0057] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. An appearance inspection apparatus characterized by comprising: The first planar coaxial light source (1) comprises a light guide plate (11) and a lamp plate (12) arranged at the outer periphery of the light guide plate (11); a light reflection layer (13) is arranged on the back side of the light guide plate (11), and a stripe pattern (14) is printed on the front side opposite to the back side, the stripe pattern (14) comprising a plurality of non-transparent stripe patterns (100) arranged in parallel at intervals. The light reflection layer (13) is composed of a plurality of arc convex points, which are used to reflect the light emitted by the lamp plate (12) into the light guide plate (11) and make the light emitted from the front side of the light guide plate (11). The first planar coaxial light source (1) is provided with at least three.

2. The appearance inspection apparatus according to claim 1, characterized by All the first planar coaxial light sources (1) are arranged in a circular array around the center line of the detection station, and the light guide plates (11) of the first planar coaxial light sources (1) are parallel to the center line of the detection station. The second planar coaxial light source (2) is also provided with at least three, and the structure of the second planar coaxial light source (2) is the same as that of the first planar coaxial light source (1).

3. The appearance inspection apparatus according to claim 2, characterized by All the second planar coaxial light sources (2) are arranged in a circular array around the center line of the detection station, and the light guide plates (11) of the second planar coaxial light sources (2) are arranged obliquely relative to the center line of the detection station. The detection camera (3) is installed on one side of the light guide plate (11) and the lens thereof faces the back side.

4. The appearance inspection apparatus according to claim 1, characterized by The coaxial light source (4) is located directly above the detection station. The detection hole and the light emitting hole of the coaxial light source (4) are arranged at intervals from top to bottom, and the light emitting hole faces the detection station.

5. The appearance inspection apparatus according to claim 2, characterized by The coaxial light source (4) further comprises a shell (41), a light splitter (42), a diffusion plate (43) and a light emitting plate (44). The light splitter (42), the diffusion plate (43) and the light emitting plate (44) are all installed in the shell (41), the light emitting plate (44) emits light to the diffusion plate (43), the light passes through the diffusion plate (43) and is reflected by the light splitter (42) to the detection station.

6. The appearance inspection apparatus according to claim 5, wherein The arc convex points have a groove recessed from the back side of the light guide plate (11) to the middle part of the light guide plate (11), and the edge arc surface of the groove is used to reflect the light emitted by the lamp plate (12) into the light guide plate (11). The control module is electrically connected to each of the first planar coaxial light sources (1), and the control module is electrically connected to the detection camera (3).

7. The appearance inspection apparatus according to claim 1, wherein The lamp plate (12) comprises a circuit board and LED lamp beads mounted on the circuit board.

8. The appearance inspection apparatus according to claim 4, wherein The non-transparent stripe patterns (100) are straight lines or serpentine lines. ​ 9. The appearance inspection apparatus according to claim 1, wherein ​ 10. The appearance inspection apparatus according to claim 1, wherein ​

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