Automatic detection equipment based on machine vision

Abstract

The utility model provides automatic detection equipment based on machine vision, and relates to the technical field of automatic detection equipment. Comprising a rack, a conveying belt, a gantry support and a control system. An adjustable sliding block and an adjusting support are arranged on the gantry support, the sliding block carries a camera assembly capable of moving transversely, double-light-source assemblies with adjustable angles and heights are arranged on the front side and the rear side of the gantry support, and 10-60-degree multi-angle illumination is achieved through a rotating assembly. The adjusting support is connected with the photoelectric probe through a three-level hinge rod, and the camera is accurately triggered to shoot. According to the scheme, through cooperative adjustment of the light source, the camera and the trigger, the problems that existing equipment is poor in compatibility and low in detection precision are solved, and the device is particularly suitable for multi-variety and high-precision industrial production lines.

Description

TECHNICAL FIELD

[0001] The utility model relates to automatic detection equipment technical field, specifically, relate to a kind of automatic detection equipment based on machine vision, it is applicable to the rapid visual detection of product in industrial production line, such as appearance defect identification, size measurement etc. BACKGROUND

[0002] The existing visual detection equipment usually adopts fixed light source and camera layout, and has the following problems:

[0003] The light source angle is fixed, and cannot adapt to different product surface reflection characteristics, resulting in unstable imaging quality;

[0004] The camera position is difficult to adjust, and it is difficult to match the detection needs of multiple specifications of products;The synchronization of triggering detection is poor, and it is easy to miss detection or repeat shooting. For example, the existing fixed gantry type detection equipment adjusts the position of light source and camera depending on manual operation, which is low in efficiency and prone to problems such as reflection. INVENTION CONTENTS

[0005] The utility model discloses an automatic visual detection equipment, which significantly improves the detection accuracy and compatibility by a multi-degree-of-freedom light source and camera adjustment system combined with a dynamic triggering mechanism.

[0006] The utility model adopts the following scheme:

[0007] An automatic detection equipment based on machine vision comprises a rack, a conveying belt mechanism is arranged on the rack to convey products, and further comprises a control system and a gantry support arranged above the conveying belt, an adjustable sliding block and an adjusting support are movably arranged on the gantry support, a camera assembly connected to the control system is arranged on the adjustable sliding block to adapt to photographing detection of the products on the conveying belt, and the camera assembly is adapted to move in the width direction of the conveying belt mechanism through the adjustable sliding block;A trigger connected to the control system is arranged on the adjusting support, and the camera assembly is adapted to be triggered to perform photographing detection when the products pass through the trigger;First and second light source assemblies with adjustable light source angles are respectively arranged on the front and back sides of the camera assembly, and the first and second light source assemblies are adapted to irradiate the products from the front and back sides.

[0008] Further, the first light source assembly is arranged on the vertical rod of the gantry support, and is adapted to be raised and lowered on the gantry support to adjust the height of the light source;A vertical column assembly is arranged at the upstream end of the gantry support, the second light source assembly is adapted to be raised and lowered on the vertical column assembly to adjust the height of the light source, and the vertical column assembly is arranged at the upstream end of the camera assembly.

[0009] Further, the first light source assembly and the second light source assembly each comprise a rotating assembly and a light bar, wherein the rotating assembly on the first light source assembly connects the light bar with the gantry support, and the rotating assembly on the second light source assembly connects the light bar with the column assembly.

[0010] Further, the rotating assembly comprises an optical axis, a first optical axis support, a second optical axis support and an adapter, the first optical axis support is movably arranged on the gantry support or the column assembly, the second optical axis support is connected to the first optical axis support through the optical axis, so that the second optical axis support is adapted to rotate on the first optical axis support around the optical axis, and the adapter connects the light bar with the second optical axis support.

[0011] Further, the adjustable sliding block is connected with a camera support, the camera support comprises a first X-axis sliding block, a Z-axis sliding rail connected to the first X-axis sliding block, and a movable rod arranged on the Z-axis sliding rail and used for connecting a camera assembly, and the camera assembly is adapted to rotate on the movable rod.

[0012] Further, the adjusting support comprises a second X-axis sliding block, a first adjusting rod connected to the second X-axis sliding block, a second adjusting rod hingedly connected to the first adjusting rod through a connecting block, and a third adjusting rod hingedly connected to the second adjusting rod through a connecting block, the third adjusting rod is connected with a photoelectric probe through a probe adapter block, and the photoelectric probe is connected to the control system.

[0013] Beneficial effects:

[0014] The angle, position and height of the camera assembly are adjusted, so that the detection range of the detection system is greatly improved, and the adaptability of the equipment is improved; the trigger with adjustable position is matched with the camera assembly, product detection of different heights can be adapted, the dynamic triggering mechanism makes the missed detection rate less than 0.01%, and the single-piece detection time is less than or equal to 0.5 s; the two light source assemblies are arranged, so that the two sides of the product can be synchronously illuminated when photographing, the reflection problem is reduced, and the detection quality is improved; the angles of the two light source assemblies are adjustable, so that products of different heights and sizes can be adapted. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is a structural schematic view of an automatic detection equipment based on machine vision according to an embodiment of the present application;

[0016] Fig. 2 is a structural schematic view of a gantry support of an automatic detection equipment based on machine vision according to an embodiment of the present application;

[0017] Fig. 3It is the light source assembly structure schematic view of the embodiment of the utility model, DETAILED DESCRIPTION

[0018] In combination Figs. 1-3 As shown in the combination, the embodiment provides a kind of based on machine vision's automated detection equipment, including rack 1, the rack 1 is provided with conveying belt mechanism 2 to be used for transmission product, still include: control system and the gantry bracket of setting in the conveying belt mechanism 2 upper, the adjustable slide 3 and adjusting support 4 are movably arranged on the gantry bracket, the adjustable slide 3 is provided with the camera assembly 5 connected to the control system to be suitable for the photographing detection of product on conveying belt, and the camera assembly 5 is suitable for moving in the width direction of conveying belt mechanism by the adjustable slide 3;The trigger 6 connected with the control system is provided on the adjusting support 4, when product passes through the trigger 6, it is suitable to trigger the camera assembly 5 and carry out photographing detection;First light source assembly 7 and second light source assembly 8 of light source angle adjustable are respectively provided on the front and back of the camera assembly 5, and the first light source assembly 7 and second light source assembly 8 are suitable for illuminating the product from front and back.

[0019] In combination Fig. 1 As shown in the combination, in the scheme, the rack 1 bottom is provided with movable wheel 9 and fixed structure 10, movable wheel 9 can be conveniently moved rack 1, by setting fixed structure 10 can be positioned at specified position, prevent rack 1 from moving when working.The conveying belt mechanism 2 is arranged on rack 1, for transmission product.The gantry bracket is arranged on the rack 1, and located in the upper of the conveying belt mechanism 2.The gantry bracket includes vertical rod 11 and horizontal moving slide rail 12 horizontally arranged on vertical rod 11, the adjustable slide 3 can be moved on the horizontal moving slide rail 12 by manual mode, to control the position of the camera assembly 5 on X axis, in preferred embodiment, the horizontal moving slide rail 12 can also be provided with horizontal moving mechanism such as ball screw, so that the adjustable slide 3 can be automatically moved left and right on horizontal moving slide rail 12.Similarly, the adjusting support 4 is installed on the horizontal moving slide rail 12, and can also adopt ball screw and the like horizontal moving mechanism to drive the adjusting support 4 left and right horizontal moving.

[0020] In combination Figs. 1-2As shown, in this embodiment, the adjustable slider 3 is connected with a camera support, which includes a first X-axis slider 13, a Z-axis sliding rail 14 connected to the first X-axis slider 13, and a movable rod arranged on the Z-axis sliding rail 14 for connecting the camera assembly 5, and the camera assembly 5 is adapted to rotate on the movable rod. Through this arrangement, on the one hand, the camera assembly 5 can be lifted to adapt to products of different sizes, and on the other hand, the angle of the camera assembly 5 can be adjusted to adapt to different shooting angle requirements. Since the adjustable slider 3 can move on the transverse sliding rail 12, the position of the camera assembly 5 can be conveniently adjusted. The camera assembly 5 of this embodiment can use an existing industrial camera, and after obtaining image information through shooting, the image information is sent to the control system for identification processing.

[0021] The adjusting support 4 includes a second X-axis slider 15, a first adjusting rod 16 connected to the second X-axis slider 15, a second adjusting rod 17 hingedly connected to the first adjusting rod 16 through a connecting block, and a third adjusting rod 18 hingedly connected to the second adjusting rod 17 through a connecting block, and the third adjusting rod 18 is connected with a photoelectric probe through a probe adapter block, and the photoelectric probe is connected to the control system. Through this scheme, the position, height and angle of the trigger 6 can be conveniently adjusted to adapt to different product requirements. The trigger 6 is used to cooperate with the camera assembly 5, and when the trigger 6 detects a product, the camera assembly 5 is triggered to take a picture. The trigger 6 can use a photoelectric probe. The photoelectric probe is connected through three-stage hinged rods, and when a product reaches the sensing range of the photoelectric probe, the photoelectric probe is triggered to take a picture, ensuring accurate shooting position. The photoelectric signal is processed in real time through the PLC control system, and the trigger delay error is less than 1 ms.

[0022] In this embodiment, two groups of light source assemblies are symmetrically arranged on the front and rear sides of the camera assembly 5. Specifically, the first light source assembly 7 is arranged on the vertical rod 11 of the gantry support, and is adapted to be lifted on the gantry support to adjust the height of the light source; the upstream end of the gantry support is provided with a column assembly 19, and the second light source assembly 8 is adapted to be lifted on the column assembly 19 to adjust the height of the light source, and the column assembly 19 is arranged at the upstream end of the camera assembly 5. Through the two groups of light source assemblies, light can be simultaneously irradiated on both sides of the product, reducing the problem of product reflection and improving the efficiency of visual inspection. The two groups of light source assemblies can be adjusted in height and angle to adapt to different product specifications.

[0023] In combination with Figs. 1-3As shown, here, the first light source assembly 7 and the second light source assembly 8 both include a rotating assembly 20 and a light bar 21, wherein the rotating assembly 20 on the first light source assembly 7 connects the light bar 21 with the gantry support, and the rotating assembly 20 on the second light source assembly 8 connects its light bar 21 with the column assembly 19. The rotating assembly 20 includes an optical axis 22, a first optical axis support 23, a second optical axis support 24, and an adapter 25, the first optical axis support 23 is movably arranged on the gantry support or the column assembly 19, the second optical axis support 24 is connected to the first optical axis support 23 through the optical axis 22, so that the second optical axis support 24 is adapted to rotate on the first optical axis support 23 around the optical axis 22; the adapter 25 connects the light bar 21 with the second optical axis support 24. By arranging the rotating assembly 20, the angle of the light source assembly is adjusted conveniently.

[0024] The embodiment adjusts the angle, position and height of the camera assembly 5, so that the detection range of the detection system is greatly improved, and the adaptability of the equipment is improved; the trigger 6 with adjustable position is arranged to cooperate with the camera assembly 5, so that the product detection of different heights can be adapted, and the dynamic triggering mechanism makes the missed detection rate <0.01%, and the single-piece detection time is ≤0.5 s; the two groups of light source assemblies are arranged to synchronously illuminate the two sides of the product when photographing, so that the reflection problem is reduced, and the detection quality is improved; the angles of the two groups of light source assemblies are adjustable, so that the products of different heights and sizes can be adapted, thereby greatly improving the universality of the equipment, solving the problems of poor compatibility and low detection precision of the existing detection equipment, and being particularly suitable for multi-variety and high-precision industrial production lines.

[0025] It should be understood that: the above is only the preferred embodiment of the present application, the protection scope of the present application is not limited to the above-mentioned embodiments, and any technical solution belonging to the idea of the present application belongs to the protection scope of the present application.

[0026] The above introduction of the drawings used in the embodiments only shows some embodiments of the present application, and should not be regarded as the limitation of the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without creative labor.

Claims

1. A machine vision based automated inspection apparatus comprising a frame having a conveyor mechanism disposed thereon for transporting products, characterized in that, Also include: The control system and the gantry bracket arranged above the conveying belt, the adjustable slide and the adjusting bracket are movably arranged on the gantry bracket, the camera assembly connected to the control system is arranged on the adjustable slide to adapt to the photographing detection of the product on the conveying belt, and the camera assembly is adapted to move in the width direction of the conveying belt mechanism through the adjustable slide; The trigger connected with the control system is arranged on the adjusting bracket, which is adapted to trigger the camera assembly to take pictures when the product passes through the trigger; The first light source assembly and the second light source assembly with adjustable light source angle are arranged on the front and back of the camera assembly respectively, and the first light source assembly and the second light source assembly are adapted to irradiate the product from the front and back.

2. The machine vision-based automated inspection apparatus of claim 1, wherein, The first light source assembly is arranged on the vertical rod of the gantry bracket, and it is adapted to rise and fall on the gantry bracket to adjust the height of the light source; The vertical column assembly is arranged at the upstream end of the gantry bracket, and the second light source assembly is adapted to rise and fall on the vertical column assembly to adjust the height of the light source, and the vertical column assembly is arranged at the upstream end of the camera assembly.

3. The machine vision-based automated inspection apparatus of claim 2, wherein, The first light source assembly and the second light source assembly both include a rotating assembly and a light bar, wherein the rotating assembly on the first light source assembly connects the light bar with the gantry bracket, and the rotating assembly on the second light source assembly connects the light bar with the vertical column assembly.

4. The machine vision-based automated inspection apparatus of claim 3, wherein, The rotating assembly includes an optical axis, a first optical axis support, a second optical axis support and an adapter, the first optical axis support is movably arranged on the gantry bracket or the vertical column assembly, the second optical axis support is connected to the first optical axis support through the optical axis, so that the second optical axis support is adapted to rotate on the first optical axis support around the optical axis; The adapter connects the light bar with the second optical axis support.

5. The machine vision-based automated inspection apparatus of claim 1, wherein, The adjustable slide is connected with a camera support, the camera support includes a first X-axis slide, a Z-axis slide rail connected to the first X-axis slide, and a movable rod arranged on the Z-axis slide rail for connecting the camera assembly, and the camera assembly is adapted to rotate on the movable rod.

6. The machine vision-based automated inspection apparatus of claim 1, wherein, The adjusting bracket includes a second X-axis slide, a first adjusting rod connected to the second X-axis slide, a second adjusting rod hinged with the first adjusting rod through a connecting block, and a third adjusting rod hinged with the second adjusting rod through a connecting block, and the third adjusting rod is connected with a photoelectric probe through a probe adapter block, and the photoelectric probe is connected to the control system.

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