Detection device based on machine vision

Abstract

The utility model relates to the technical field of machine vision detection, in particular to a detection device based on machine vision. The detection device comprises a portal frame, a detection camera, a jig, a light source and a processing terminal, the detection camera is connected with the portal frame, and the detection camera is used for shooting a to-be-detected plane of a to-be-detected component below the portal frame and outputting a plane image; the jig is arranged below the portal frame, a light through hole of a hollow structure is formed in the jig, supporting edges protruding upwards are arranged on the periphery of the light through hole, and the supporting edges are used for bearing a to-be-detected plane; the light source is arranged below the jig and is used for supplementing light to the to-be-detected plane through the light through hole; and the processing terminal is connected with the image output port of the detection camera and is used for outputting a detection result of the to-be-detected plane according to the plane image. According to the technical scheme, the to-be-detected part can be supported through the jig, so that the levelness deviation of the to-be-detected plane of the to-be-detected part is within the preset range, and the detection quality of machine vision detection of the to-be-detected part is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of machine vision inspection, and in particular to an inspection device based on machine vision. Background Technology

[0002] In the semiconductor field, screen printing, also known as stencil printing, is a printing process that uses a screen printing stencil. A screen printing stencil typically consists of a main body made of an aluminum alloy frame and woven stainless steel wire, coated with latex of the corresponding shape according to the design drawings. During printing, ceramic paste is placed on the screen printing stencil, and pressure is applied using a squeegee or scraper to transfer the paste through the grid area of ​​the stencil to the raw ceramic sheet below, thus forming specific patterns, lines, or functional layers, such as electrodes, resistors, and capacitors, on the raw ceramic sheet.

[0003] Because of the parallelism error between the aluminum alloy frame and the screen, if the aluminum alloy frame is placed horizontally and the screen is photographed for inspection, the parallelism error may prevent the accurate detection of clogging defects in the screen. Therefore, a new type of inspection device is needed to improve the inspection quality of screen printing screens. Utility Model Content

[0004] In view of the above-mentioned technical problems, the present invention provides a machine vision-based inspection device that can support the inspection plane of the component to be inspected so that its level deviation is within a preset range, thereby improving the inspection quality of the component to be inspected by machine vision.

[0005] The present invention provides the following solutions:

[0006] This utility model embodiment provides a machine vision-based detection device, the device comprising:

[0007] Gantry frame;

[0008] An inspection camera is connected to a gantry frame. The inspection camera is used to capture images of the plane under the gantry frame of the component to be inspected and output a planar image. The component to be inspected includes a screen printing stencil.

[0009] The fixture is located below the gantry frame. The fixture has a hollow structure with a light-transmitting hole. The outer periphery of the light-transmitting hole has an upward-protruding support rib. The support rib is used to support the surface to be inspected so that the horizontal deviation of the surface to be inspected is within a preset range.

[0010] The light source is located below the fixture and is used to provide supplemental light to the surface to be inspected through the light-transmitting hole;

[0011] The processing terminal is connected to the image output port of the detection camera. The processing terminal is used to output the detection results of the plane to be inspected based on the planar image.

[0012] In one optional embodiment, the outer periphery of the support rib is provided with a plurality of threaded holes, and an adjusting nut is provided in the threaded holes. The adjusting nut is used to adjust the level deviation of the top surface of the support rib.

[0013] In one alternative embodiment, the fixture is further provided with a positioning protrusion for positioning the part to be inspected.

[0014] In one alternative embodiment, the fixture is further provided with a clearance groove, which is used by the user to perform pick-up and put-down operations on the part to be inspected.

[0015] In an optional embodiment, the device further includes:

[0016] A vertical adjustment mechanism is installed on the gantry. The drive port of the vertical adjustment mechanism is connected to the processing terminal. The vertical adjustment mechanism is equipped with a mounting bracket for the detection camera.

[0017] The rangefinder is mounted on the vertical adjustment mechanism. The output port of the rangefinder is connected to the processing terminal. The rangefinder is used to measure the vertical distance between itself and the plane to be inspected and outputs the result to the processing terminal.

[0018] The processing terminal is also used to control the vertical adjustment mechanism to move the detection camera according to the vertical distance, so that the shooting focal length of the detection camera is within the target range.

[0019] In an optional embodiment, the device further includes:

[0020] The mobile platform is connected at its top to the bottom of the fixture, and its drive port is connected to the processing terminal. The mobile platform is used to drive the fixture to move under the control of the processing terminal.

[0021] The clamping mechanism, located on the support plate at the top of the mobile platform, is used to fix the parts to be inspected on the fixture.

[0022] In one alternative embodiment, the clamping mechanism includes:

[0023] A crossbar is installed on one side of the fixture;

[0024] The telescopic joint is connected to the crossbar. The control port of the telescopic joint is connected to the processing terminal. The telescopic joint is used to push the crossbar to fix the part to be inspected on the fixture.

[0025] In an optional embodiment, the clamping mechanism further includes:

[0026] At least one inductive switch is disposed on the plane of the crossbar that is in close contact with the fixture. The output port of the inductive switch is connected to the processing terminal. The inductive switch is used to output an inductive signal to the processing terminal when it senses that the crossbar is in close contact with the fixture.

[0027] In an optional embodiment, the clamping mechanism further includes:

[0028] At least one buffer element is disposed on the plane of the crossbar that is in close contact with the fixture.

[0029] In an optional embodiment, the clamping mechanism further includes:

[0030] The slide rail is installed along the extension and retraction direction of the expansion joint, and the slide rail is slidably connected to the crossbar.

[0031] Compared with the prior art, the machine vision-based detection device of this invention has the following advantages:

[0032] The inspection device of this utility model includes a gantry frame, an inspection camera, a fixture, a light source, and a processing terminal. The inspection camera is connected to the gantry frame and is used to photograph the plane of the component to be inspected below the gantry frame and output a planar image. The fixture is set below the gantry frame and has a hollowed-out light-transmitting hole. The outer periphery of the light-transmitting hole has upward-protruding support ribs for supporting the plane to be inspected. The light source is set below the fixture and is used to provide supplemental lighting to the plane to be inspected through the light-transmitting hole. The processing terminal is connected to the image output port of the inspection camera and is used to output the inspection results of the plane to be inspected based on the planar image. This technical solution can support the component to be inspected by using a fixture, ensuring that the horizontal deviation of the plane to be inspected is within a preset range. It can also improve the clarity of overhead shots when the inspection camera photographs the plane to be inspected, providing better accuracy for machine vision inspection of screen printing stencils and other components, thereby improving the inspection quality of machine vision inspection of the components. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A first structural schematic diagram of the machine vision-based detection device provided in an embodiment of this utility model;

[0035] Figure 2 A schematic diagram of the second structure of the machine vision-based detection device provided in an embodiment of this utility model;

[0036] Figure 3 A schematic diagram of the structure of the light source provided in an embodiment of this utility model.

[0037] Explanation of reference numerals in the attached drawings: 1-Gantry frame, 2-Inspection camera, 3-Jig, 4-Light source, 5-Bearing plate, 6-Vertical adjustment mechanism, 7-Range meter, 8-Fixed base, 9-Moving platform, 10-Clamping mechanism, 11-Vertical pushing mechanism, 12-Base;

[0038] 31-Light transmission hole, 32-Support rib, 33-Positioning protrusion, 34-Void clearance groove;

[0039] 51 - Threaded hole;

[0040] 101-Horizontal bar, 102-Telescopic device, 103-Inductive switch, 104-Buffer, 105-Slide rail. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the embodiments of the present utility model.

[0042] Please see Figure 1 , Figure 1 This is a first structural schematic diagram of a machine vision-based inspection device. The inspection device includes a gantry, an inspection camera, a fixture, a light source, and a processing terminal.

[0043] The gantry frame is mounted on a base, which serves as a support platform for the entire testing device and can be made of marble or metal. The gantry frame consists of two parallel columns, with a crossbeam at the top of each column. The gantry frame can be constructed by welding metal square tubing or by assembling metal profiles; no specific limitations are specified. The gantry frame is fixed to the base to form the main structure of the testing device.

[0044] The inspection camera can be any type of industrial inspection camera, such as a line scan camera. Line scan cameras acquire images through line-by-line scanning, featuring high resolution and high scanning speed, and can accurately capture detailed information of the parts under inspection. The inspection camera is connected to a gantry crane and is used to photograph the plane of the part under inspection below the gantry crane, outputting a planar image. The part under inspection can be a screen printing plate or a raw ceramic tile, etc., without specific limitations. When inspecting raw ceramic tiles, a glass support can be placed horizontally.

[0045] The fixture can be manufactured from aluminum alloy, for example, by milling based on its design structure. The main structure of the fixture is designed to match the shape of the part to be inspected; for example, for a rectangular screen printing stencil, the fixture is designed as a corresponding rectangular frame. The fixture is positioned below the gantry frame and has perforated light-transmitting holes. The outer periphery of these holes has upward-protruding support ribs, the width of which can be set according to actual needs, such as 2-8mm. These support ribs support the surface to be inspected, ensuring that the horizontal deviation of the surface is within a preset range. Taking screen printing stencil inspection as an example, when the fixture supports the screen printing stencil, the outer frame of the stencil is located on the outer periphery of the support ribs, and the top of the support ribs is in contact with the screen surface, ensuring that the screen is in an ideal horizontal state during inspection.

[0046] The light source can be set as an LED light source, with LED beads distributed in an array on the light source board, allowing light to evenly illuminate the part under inspection through the light-transmitting holes of the fixture. The light source can be equipped with heat sinks or fans for heat dissipation to ensure the stability of the LED beads during long-term operation. The light source is positioned below the fixture and is used to supplement the light on the surface under inspection through the light-transmitting holes. When detecting blockages on the screen printing stencil, the light emitted by the light source passes through the mesh of the stencil, and the inspection camera can capture a bright spot at that location; conversely, the absence of a bright spot indicates a blockage defect at that location.

[0047] The processing terminal can be configured as an industrial computer. The processing terminal is connected to the image output port of the inspection camera. Image processing software can be configured on the processing terminal. The processing terminal is used to output the inspection results of the plane to be inspected based on the planar image.

[0048] When inspecting a component, it is placed on a fixture, the inspection device is activated, and the inspection camera begins to capture images of the surface of the component. During the image capture, the light source continuously illuminates the surface to ensure image clarity. The inspection camera transmits the captured image to a processing terminal in real time. The processing terminal analyzes and processes the image according to preset inspection algorithms and standards. An inspection report can be displayed on the terminal's screen, containing basic information about the component, the inspection result (pass or fail), defect location, and type. For non-compliant components, detailed defect images and analysis data can be output to facilitate subsequent processing and printing process improvements by the operator.

[0049] In the inspection of screen printing stencils, ensuring that the surface to be inspected is ideally level is crucial for obtaining accurate results. Although the support ribs of the fixture can support the surface to be inspected, in practical applications, factors such as processing errors, equipment vibration, and component deformation due to long-term use may cause deviations in the levelness of the top surface of the support ribs. This means that the component to be inspected is not perfectly level after placement, and when the inspection camera takes a picture from above, the image is prone to distortion, leading to a decrease in inspection accuracy.

[0050] Based on this, in one specific embodiment, the outer periphery of the support rib is provided with multiple threaded holes, such as... Figure 1 As shown, threaded holes are located on the support plate at the bottom of the fixture, at right angles to the four edges of the support plate. Adjusting nuts are installed inside the threaded holes to adjust the levelness deviation of the top surface of the support rib. When the levelness deviation of the top surface of the support rib is not within the target range, the levelness deviation is adjusted by rotating the adjusting nuts.

[0051] In practice, a high-precision level and other measuring tools are used to measure the levelness data of the top surface of the support rib. When a levelness deviation is detected to exceed the preset target range, the adjusting nut at the corresponding position is rotated according to the measurement data. If one end of the support rib is too high, the adjusting nut at that end is loosened to lower the support rib at that end; if one end is too low, the adjusting nut at that end is tightened to raise the support rib. Through this adjustment method, precise control of the levelness of the top surface of the support rib can be achieved, ensuring that when the part to be inspected is placed on the support rib, the levelness deviation of its inspected surface is within a very small range, meeting the requirements of high-precision testing.

[0052] During the inspection process, it is necessary to ensure that the part to be inspected is accurately placed in the appropriate position on the fixture each time. Based on this, the fixture is also equipped with positioning protrusions, which are used to position the part to be inspected. The positioning protrusions can be set at the reference right angle position of the fixture. The positioning protrusions are two perpendicular right angles. When placing the part to be inspected, its outer right angles are pressed tightly against the positioning protrusions to accurately position the part to be inspected.

[0053] Furthermore, the fixture is also equipped with clearance slots, which are used by the user to place and remove the parts to be inspected. For example... Figure 1 As shown, clearance slots are formed on the parallel and opposite edges of the fixture, with one clearance slot located at a reference right angle to the fixture. These clearance slots provide operators with space for picking and placing the screen printing stencil, preventing the positioning protrusions from obstructing the operation. Operators can more easily and accurately place the screen printing stencil into the designated position on the light-transmitting platform and remove it from the platform, improving the convenience and efficiency of the operation.

[0054] Furthermore, the detection device also includes a vertical adjustment mechanism and a rangefinder; please refer to [link / reference needed]. Figure 1and Figure 2 The vertical adjustment mechanism is mounted on the gantry frame. Its drive port is connected to the processing terminal. The vertical adjustment mechanism has a mounting base for the detection camera and is used to adjust the camera's position in the Z-axis. The rangefinder can be configured as a laser rangefinder or other types depending on actual needs. The rangefinder is mounted on the vertical adjustment mechanism, and its output port is connected to the processing terminal. The rangefinder measures the vertical distance between itself and the plane to be inspected and outputs the result to the processing terminal. The processing terminal also controls the vertical adjustment mechanism to move the detection camera based on the vertical distance, ensuring the camera's focal length is within the target range.

[0055] A built-in program in the processing terminal can calculate the optimal shooting position and focal length range of the inspection camera based on the vertical distance data fed back by the rangefinder, combined with preset detection parameters and the characteristics of different components to be inspected. The processing terminal controls the vertical adjustment mechanism to precisely adjust the vertical position of the inspection camera, ensuring that the camera's shooting focal length is always within the target range.

[0056] The vertical adjustment mechanism can be configured as a lead screw and nut structure, controlled by a servo motor to adjust the vertical position of the inspection camera. With the precise coordination of the vertical adjustment mechanism and the rangefinder, the inspection camera can always maintain the most suitable vertical position for shooting. This results in clearer, more complete images of the screen printing stencil, with richer detail, improving the detection capability for minor defects (such as broken lines), thereby enhancing inspection accuracy and providing a more reliable basis for the quality assessment of the screen printing stencil.

[0057] It is understandable that configuring a vertical adjustment mechanism and a rangefinder can enable the inspection device to adapt to the inspection needs of screen printing plates with different thicknesses and surface flatness. The inspection camera can accurately adjust its vertical position according to the actual situation of the surface to be inspected, so that the shooting focal length is always in the optimal state.

[0058] In practical applications, if the fixture cannot be moved, the inspection camera can only photograph a fixed area, which may result in blind spots for some larger parts to be inspected. Therefore, in one specific embodiment, the inspection device further includes a moving platform and a clamping mechanism:

[0059] The top of the mobile platform connects to the bottom of the fixture, and the drive port of the mobile platform connects to the processing terminal. The mobile platform is used to drive the fixture to move under the control of the processing terminal. Please continue reading. Figure 1 The moving platform allows the fixture to move along the X and Y directions, increasing the inspection range of the parts to be inspected. A clamping mechanism, mounted on a support plate at the top of the moving platform, is used to secure the parts to be inspected on the fixture.

[0060] The clamping mechanism can be designed as a cylinder-driven gripper, where the opening and closing of the gripper is controlled by the extension and retraction of the cylinder to fix the part to be inspected. Alternatively, an electric clamping method can be used, where a motor drives a screw to create relative movement of the gripper to clamp the part to be inspected. The shape and clamping force of the gripper can be adjusted for parts of different shapes and sizes.

[0061] For example, the clamping mechanism includes a crossbar and a telescopic element.

[0062] A crossbar is positioned on one side of the fixture, parallel to the Y-axis. An extension joint connects to the crossbar, extending parallel to the X-axis. The control port of the extension joint connects to the processing terminal. The extension joint is used to push the crossbar to fix the component to be inspected on the fixture. Taking screen printing stencil inspection as an example, the extension and retraction of the extension joint is controlled by the processing terminal. When the screen printing stencil needs to be clamped, the extension joint retracts, making the crossbar fit tightly against the side of the stencil. After the inspection of the screen printing stencil is completed, the extension joint extends, separating the crossbar from the stencil. Through the cooperation of the crossbar and the extension joint, a uniform and stable fixing force can be provided to the screen printing stencil, preventing displacement and shaking of the stencil during inspection, allowing the inspection camera to capture clear and accurate planar images.

[0063] Furthermore, the clamping mechanism also includes at least one inductive switch.

[0064] The inductive switch is mounted on the horizontal bar, flush against the surface of the fixture. Please refer to the following document. Figure 1 To ensure accurate sensing, two induction switches can be installed along the length of the crossbar. These switches are mechanical microswitches, and their output ports are connected to a processing terminal. The switches detect when the crossbar is in close contact with the fixture and output a signal to the processing terminal. If the induction switches are triggered when the telescopic device retracts, it indicates that the crossbar is in close contact with the screen printing plate, and the processing terminal controls the telescopic device to stop.

[0065] To further ensure reliable clamping of the parts to be inspected, the clamping mechanism also includes at least one buffer and a slide rail.

[0066] The buffer is mounted on the crossbar, flush against the surface of the fixture, located on one side of the inductive switch. The buffer possesses good elasticity and shock absorption properties, and is made of rubber or silicone material. When the crossbar moves towards the part to be inspected under the push of the telescopic device, the buffer first contacts the fixture or the part to be inspected, using its own elastic deformation to absorb the impact force, slowing down the movement speed of the crossbar and preventing damage to the part to be inspected and the inspection device from rigid collisions. Simultaneously, the buffer also provides a certain degree of anti-slip effect, increasing the friction between the crossbar and the part to be inspected, making the fixation more secure.

[0067] The slide rail is installed along the extension and retraction direction of the expansion joint, and is slidably connected to the crossbar. The slide rail can be a high-precision linear slide rail, paired with a wear-resistant slider. The slider is tightly fixed to the crossbar, ensuring smooth and stable sliding of the crossbar on the slide rail. During installation, the position of the slide rail is adjusted to ensure that the direction of movement of the crossbar is consistent with the fixed direction of the part to be inspected, providing reliable guidance for the precise movement of the crossbar. Furthermore, limit devices can be installed at both ends of the slide rail to prevent excessive movement of the crossbar and ensure the safe operation of the testing device.

[0068] To ensure effective illumination of the components under inspection, a vertical pushing mechanism can be installed on one side of the light source. Please refer to [link / reference]. Figure 3 The vertical pushing mechanism can achieve vertical movement using electric push rods, cylinders, or lead screw and nut transmission mechanisms. Taking an electric push rod as an example, one end is fixed to the frame of the detection device, and the other end is connected to the light source. The control port of the electric push rod is connected to the processing terminal. The processing terminal calculates the optimal illumination position of the light source based on the type and surface characteristics of the screen printing stencil to be inspected, as well as the image information fed back by the detection camera. Then, the processing terminal sends control commands to the electric push rod, which, by adjusting the extension length of the electric push rod, pushes the light source up and down in the vertical direction, changing the relative height between the light source and the screen printing stencil, thereby achieving personalized illumination adjustment for different screen printing stencils.

[0069] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0070] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0071] In this application, unless otherwise expressly specified and limited, the terms "connection" and "fixed" should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; "connection" can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0072] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

Claims

1. A machine vision-based detection device, characterized in that, The device includes: Gantry frame; An inspection camera is connected to the gantry frame. The inspection camera is used to capture the plane of the component to be inspected below the gantry frame and output a planar image. The component to be inspected includes a screen printing stencil. A fixture is provided below the gantry frame. The fixture has a hollow structure with a light-transmitting hole. The outer periphery of the light-transmitting hole has an upwardly protruding support rib. The support rib is used to support the plane to be inspected so that the horizontal deviation of the plane to be inspected is within a preset range. A light source is positioned below the fixture, and the light source is used to provide supplemental lighting to the plane to be inspected through the light-transmitting hole; A processing terminal is connected to the image output port of the detection camera, and the processing terminal is used to output the detection result of the plane to be inspected based on the planar image.

2. The machine vision-based detection device according to claim 1, characterized in that, The outer periphery of the support rib is provided with multiple threaded holes, and an adjusting nut is provided in the threaded hole. The adjusting nut is used to adjust the level deviation of the top surface of the support rib.

3. The machine vision-based detection device according to claim 1, characterized in that, The fixture is also provided with a positioning protrusion, which is used to position the component to be inspected.

4. The machine vision-based detection device according to claim 1, characterized in that, The fixture is also provided with a clearance groove, which is used by the user to pick up and put down the component to be inspected.

5. The machine vision-based detection device according to claim 1, characterized in that, The device further includes: A vertical adjustment mechanism is installed on the gantry frame. The drive port of the vertical adjustment mechanism is connected to the processing terminal. The vertical adjustment mechanism is provided with a mounting base for the detection camera. A rangefinder is mounted on the vertical adjustment mechanism. The output port of the rangefinder is connected to the processing terminal. The rangefinder is used to measure the vertical distance between itself and the plane to be inspected and output the result to the processing terminal. The processing terminal is also used to control the vertical adjustment mechanism to move the detection camera according to the vertical distance, so that the shooting focal length of the detection camera is within the target range.

6. The machine vision-based detection device according to claim 1, characterized in that, The device further includes: A mobile platform, the top of which is connected to the bottom of the fixture, and the drive port of the mobile platform is connected to the processing terminal. The mobile platform is used to drive the fixture to move under the control of the processing terminal. A clamping mechanism is disposed on the support plate at the top of the mobile platform, and the clamping mechanism is used to fix the component to be inspected on the fixture.

7. The machine vision-based detection device according to claim 6, characterized in that, The clamping mechanism includes: A crossbar is provided on one side of the fixture; An extension joint is connected to the crossbar, and the control port of the extension joint is connected to the processing terminal. The extension joint is used to push the crossbar to fix the component to be inspected on the fixture.

8. The machine vision-based detection device according to claim 6, characterized in that, The clamping mechanism further includes: At least one inductive switch is disposed on the plane of the crossbar that is in close contact with the fixture. The output port of the inductive switch is connected to the processing terminal. The inductive switch is used to output a sensing signal to the processing terminal when it senses that the crossbar is in close contact with the fixture.

9. The machine vision-based detection device according to claim 6, characterized in that, The clamping mechanism further includes: At least one buffer element is disposed on the plane of the crossbar that is in close contact with the fixture.

10. The machine vision-based detection device according to claim 6, characterized in that, The clamping mechanism further includes: A slide rail is provided along the extension and retraction direction of the telescopic device, and the slide rail is slidably connected to the crossbar.

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