A board card detection device and detection system

Abstract

The application provides a board detection device and a detection system. Technical scheme points of the application include a track base plate, a support assembly, and a sensor assembly. The sensor assembly is installed on the support assembly in a position-adjustable and / or angle-adjustable manner. The support assembly is connected to the track base plate, so that a detection light path of the sensor assembly can be aligned with an effective detection area of a board on a conveying track. The application has the advantage of meeting detection requirements of various different boards.

Description

Technical Field

[0001] This application relates to the field of circuit board testing equipment technology, and in particular to a circuit board testing device and testing system. Background Technology

[0002] Current AOI conveyor track detection devices typically use diffuse reflection photoelectric sensors to detect circuit boards, enabling actions such as board entry sensing, deceleration sensing, board stop sensing, and board exit sensing. However, the installation positions of these photoelectric sensors are fixed and cannot be adjusted.

[0003] As electronic products are used in increasingly diverse applications, circuit board shapes and sizes are becoming more varied, with irregular polygons and multiple shapes being pieced together to form a single board. Furthermore, there are different gaps and cutouts between the boards. Due to the fixed installation position of current sensor detection devices and their lack of flexibility in adjustment, their ability to identify and detect different shaped boards is low, failing to meet the detection requirements of various boards. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application provides a circuit board testing device and testing system to solve the problems existing in related technologies. The technical solution is as follows:

[0005] In a first aspect, embodiments of this application provide a circuit board inspection device, installed on the transport track of an AOI (Automated Optical Inspection) device, comprising: a track base plate, a support assembly, and a sensor assembly; the sensor assembly is mounted on the support assembly in a position-adjustable and / or angle-adjustable manner; the support assembly is connected to the track base plate so that the detection optical path of the sensor assembly can be aligned with the effective detection area of ​​the circuit board on the transport track. The adjustable position or angle of the sensor assembly on the transport track adapts to the inspection scenarios of circuit boards of various shapes and sizes on the transport track, improving the detection success rate.

[0006] In one embodiment, the support assembly is connected to the track substrate in a position-adjustable and / or angle-adjustable manner. The support assembly assists the sensor assembly in achieving multi-directional position and angle adjustment functions, adapting to the detection scenarios of various shapes and sizes of boards on the transport track, and improving the detection success rate.

[0007] In one embodiment, the support assembly includes a first support connected to the track substrate in a positionally adjustable manner along the X-axis of the conveying track. The sensor assembly is mounted on the projection area of ​​the board and is mounted on the first support in a positionally adjustable manner along the Y-axis of the conveying track and / or an angleably adjustable manner around the X-axis. The sensor assembly is mounted on the projection area of ​​the board via the first support, which enables multi-directional position and angle adjustment of the sensor assembly. When the first support fixes the sensor assembly directly above or below the board under test, the height of the first support is related to the board clearance height.

[0008] In one embodiment, the support assembly includes a second support connected to the track substrate in a positionally adjustable manner along the X-axis of the conveying track. The sensor assembly is mounted on the projection area of ​​the track substrate and is mounted on the second support in a manner that allows for angular adjustment around the X-axis and / or around the Y-axis. The sensor assembly is mounted on the projection area of ​​the track substrate via the second support, which enables multi-directional position and angle adjustment functions for the sensor assembly.

[0009] In one embodiment, the second bracket includes a fixed end and a movable end. The fixed end is connected to the track base plate, and the movable end is rotatably mounted on the fixed end. The sensor assembly is mounted on the movable end. The position of the fixed end on the conveying track is adjustable, and the angle of the movable end on the fixed end is adjustable, making the adjustment methods of the sensor assembly mounted on the movable end more diverse.

[0010] In one embodiment, the sensor assembly includes a reflective photoelectric sensor and / or a through-beam photoelectric sensor. The transmitting and receiving ends of the through-beam photoelectric sensor are respectively mounted on opposite sides of the conveyor track. The reflective and through-beam photoelectric sensors are used to generate light spots adapted to the effective detection area of ​​the detection board. Different types of photoelectric sensors are selected according to different detection requirements to meet the detection needs of different boards. The through-beam photoelectric sensor, by using the thickness of the board to block light, can achieve light flux change detection.

[0011] In one embodiment, the reflective photoelectric sensor is installed in one or a combination of the following arrangements: the reflective photoelectric sensor is installed directly above the board; the reflective photoelectric sensor is installed diagonally above the board; the reflective photoelectric sensor is installed directly below the board. Different detection layouts are selected according to different detection requirements to meet the detection needs of various boards.

[0012] In one embodiment, the through-beam photoelectric sensor is located on the upper surface of the conveyor track; alternatively, the transmitting and receiving ends of the through-beam photoelectric sensor are located above and below the board, respectively, and at least one end is angle-adjustable via the bracket assembly. Different layouts can compensate for the influence of varying luminous flux across different track widths.

[0013] Secondly, embodiments of this application provide a board detection system, including a conveying mechanism and a control unit, and further including at least three detection devices; the detection devices are arranged sequentially along the conveying direction of the boards on the conveying mechanism, and respectively realize board entry sensing function, board stop sensing function, and board exit sensing function; the control unit is electrically connected to the conveying mechanism and the detection devices respectively. Multiple detection devices are arranged sequentially along the conveying direction of the boards on the conveying mechanism, and can respectively realize corresponding sensing functions.

[0014] In one embodiment, the detection device includes at least one reflective photoelectric sensor and / or at least one through-beam photoelectric sensor. The sensor assembly generates signal changes when the circuit board obstructs or reflects the detection optical path. The control unit determines the positional state of the circuit board based on the signal changes. The control unit can control the conveying mechanism to perform corresponding actions based on the circuit board height, the relative position of the imaging component and the surface under test (e.g., when the imaging component is above the surface under test, the detection device can use a through-beam photoelectric sensor or a reflective photoelectric sensor positioned below), and imaging requirements (e.g., when the imaging requirement is to avoid shadows at the edges of the circuit board image, and the imaging component is above the surface under test, the detection device can use a through-beam photoelectric sensor or a reflective photoelectric sensor positioned below). By combining the detection advantages of different sensors and integrating them on a set of conveying tracks, the control unit can better meet the circuit board detection requirements.

[0015] The advantages or beneficial effects of the above technical solutions include at least the following:

[0016] The sensor assembly is mounted on the support assembly in a position-adjustable or angle-adjustable manner. The support assembly is mounted on the track substrate in a position-adjustable or angle-adjustable manner. The sensor assembly can be adjusted within a certain range along the X-axis, around the X-axis, along the Y-axis, and around the Y-axis via the support assembly on the track substrate. This adapts to the detection scenarios of various shapes and sizes of boards on the transport track, improves the detection success rate, and meets the detection requirements of the boards.

[0017] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0018] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0019] Figure 1 This is a top view schematic diagram of the detection device in this utility model;

[0020] Figure 2 This is a side view of the detection device in this utility model;

[0021] Figure 3 This is a first schematic diagram of the sensor assembly in this utility model;

[0022] Figure 4 This is a second schematic diagram of the sensor assembly in this utility model;

[0023] Figure 5 This is a third schematic diagram of the sensor assembly in this utility model;

[0024] Figure 6 This is a fourth distribution diagram of the sensor assembly in this utility model;

[0025] Figure 7 This is a top view schematic diagram of the detection system in this utility model.

[0026] In the diagram: 100, track base plate; 200, support assembly; 300, sensor assembly; 301, reflective photoelectric sensor; 302, through-beam photoelectric sensor; 400, board; 500, first support; 600, second support; 601, support fixed end; 602, support movable end; 701, infeed photoelectric sensor; 702, stop photoelectric sensor; 703, outfeed photoelectric sensor; 801, infeed fiber optic sensor; 802, deceleration fiber optic sensor; 803, stop fiber optic sensor; 804, outfeed fiber optic sensor. Detailed Implementation

[0027] In the following description, only certain exemplary embodiments are briefly described to make the objectives, features, and advantages of this invention more apparent. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] Example 1

[0030] like Figures 1 to 6 As shown, this embodiment provides a board detection device, which is installed on the transport track of an AOI device, including: a track base plate 100, a bracket assembly 200, and a sensor assembly 300; the sensor assembly 300 is installed on the bracket assembly 200 in a position-adjustable and / or angle-adjustable manner; the bracket assembly 200 is connected to the track base plate 100 so that the detection optical path of the sensor assembly 300 can be aligned with the effective detection area of ​​the board 400 on the transport track.

[0031] In this embodiment, the detection device is installed on the conveyor rail of the AOI equipment. The detection device includes a rail base plate 100, a support assembly 200, and a sensor assembly 300. Two rail base plates 100 are used, respectively installed on both sides of the conveyor rail. The support assembly 200 is connected to the rail base plate 100. The sensor assembly 300 is installed on the support assembly 200 in a position-adjustable and / or angle-adjustable manner, allowing the sensor assembly 300 to be adjusted within a certain range on the rail base plate 100 via the support assembly 200, including its position along the X-axis, its angle around the X-axis, its position along the Y-axis, and its angle around the Y-axis (where the X-axis is the conveying direction along the conveyor rail, and the horizontal projection of the Y-axis is perpendicular to the X-axis; see details). Figure 1 (Coordinate system) The position and angle of the sensor assembly 300 on the conveying track can be adjusted to adapt to the detection scenarios of various shapes and sizes of boards 400 on the conveying track, improve the detection success rate, and meet the detection requirements of boards 400.

[0032] The sensor assembly 300 includes several sensors. The sensor assembly 300 can adopt a single sensor scheme or a dual sensor scheme. Through a safety redundancy design, if one sensor fails, the other sensor can still work normally, ensuring successful detection.

[0033] Multiple mounting holes are reserved on the track substrate 100 along the track conveying direction. The bracket assembly 200 can be installed at different positions on the track substrate 100 through the aforementioned mounting holes to achieve multiple fixing methods for detection, better meeting the needs of the detection scenario.

[0034] The support assembly 200 is connected to the track base plate 100 in a position-adjustable and / or angle-adjustable manner.

[0035] The bracket assembly 200 is installed and fixed through multiple pre-drilled mounting holes on the track base plate 100, thereby achieving the effect of adjusting the position of the bracket assembly 200 on the track base plate 100 along the track conveying direction. The bracket assembly 200 can adopt a multi-segment structure, which has a fixed end and a movable end. The fixed end is installed on the track base plate 100 through the mounting holes, and the movable end can rotate freely around the fixed end at multiple angles, thereby achieving the effect of adjusting the angle of the bracket assembly 200 on the track base plate 100.

[0036] The support assembly 200 includes a first support 500, which is connected to the track substrate 100 in a manner that allows for positional adjustment along the X-axis of the conveying track. The sensor assembly 300 is mounted on the projection area of ​​the board 400 and is mounted on the first support 500 in a manner that allows for positional adjustment along the Y-axis of the conveying track and / or angle adjustment around the X-axis.

[0037] The first bracket 500 is mounted on the track base plate 100 in an adjustable manner along the X-axis direction of the conveying track through the mounting holes of the track base plate 100. The sensor assembly 300 is mounted on the first bracket 500 in an adjustable manner along the Y-axis direction of the conveying track or in an adjustable manner around the Y-axis direction. The sensor assembly 300 is mounted on the projection area of ​​the board 400 (directly above or below the board 400) through the first bracket 500. The height of the first bracket 500 is related to the height of the board.

[0038] The first bracket 500 has a mounting groove extending in the Y-axis direction, and the sensor assembly 300 is disposed in the mounting groove, thereby realizing the position adjustment function of the sensor in the Y-axis direction; the sensor assembly 300 has an angle adjustment component, which can make the sensor rotate within a certain angle range, thereby realizing the angle adjustment function of the sensor around the X-axis direction.

[0039] The bracket assembly 200 includes a second bracket 600, which is connected to the track substrate 100 in a position adjustable along the X-axis of the conveying track. The sensor assembly 300 is mounted on the projection area of ​​the track substrate 100 and is mounted on the second bracket 600 in a manner that is adjustable around the X-axis and / or around the Y-axis.

[0040] The second bracket 600 is mounted on the upper end of the track substrate 100 through the mounting holes of the track substrate 100 in a manner that the position is adjustable along the X-axis direction of the conveying track. The sensor assembly 300 is mounted on the second bracket 600 in a manner that the angle around the X-axis direction is adjustable or the angle around the Y-axis direction is adjustable. The sensor assembly 300 is mounted on the projection area of ​​the track substrate 100 through the second bracket 600.

[0041] The second bracket 600 has a fixed end and a movable end. The fixed end is mounted on the track base plate 100, and the movable end can rotate around the fixed end. The sensor assembly 300 is disposed on the movable end. When the movable end rotates, it can drive the sensor assembly 300 to rotate around the X-axis, thereby realizing the angle adjustment function of the sensor around the X-axis. The sensor assembly 300 has a built-in angle adjustment component, which can make the sensor rotate within a certain angle range, thereby realizing the angle adjustment function of the sensor around the Y-axis.

[0042] The second bracket 600 includes a bracket fixed end 601 and a bracket movable end 602. The bracket fixed end 601 is connected to the track base plate 100, and the bracket movable end 602 is rotatably disposed on the bracket fixed end 601. The sensor assembly 300 is mounted on the bracket movable end 602.

[0043] The second bracket 600 includes a fixed end 601 and a movable end 602. The fixed end 601 is mounted on the track base plate 100 through mounting holes in the track base plate 100 in a position adjustable along the X-axis of the conveying track. The movable end 602 is rotatably mounted on the fixed end 601 and can rotate freely around the fixed end 601 at multiple angles. The sensor assembly 300 is mounted on the movable end 602. When the movable end 602 rotates, it can drive the sensor assembly 300 to rotate within a certain angle range, thereby achieving the effect of multi-angle adjustment of the sensor assembly 300.

[0044] The sensor assembly 300 includes a reflective photoelectric sensor 301 and / or a through-beam photoelectric sensor 302. The transmitting end and receiving end of the through-beam photoelectric sensor 302 are respectively installed on opposite sides of the conveying track. The reflective photoelectric sensor 301 and the through-beam photoelectric sensor 302 are used to generate light spots adapted to the effective detection area of ​​the detection board 400.

[0045] The sensor assembly 300 can adopt a reflective photoelectric sensor 301. The reflective photoelectric sensor 301 is used to generate a light spot that is adapted to the effective detection area of ​​the detection board 400. It includes circular light spot photoelectric sensors, square light spot photoelectric sensors, linear light spot photoelectric sensors and laser photoelectric sensors, etc. Different types of photoelectric sensors can be selected according to different needs.

[0046] The sensor assembly 300 can also be a through-beam photoelectric sensor 302. The through-beam photoelectric sensor 302 includes an optical fiber transmitter and an optical fiber receiver. The optical fiber transmitter and the optical fiber receiver are respectively set on the track substrate 100 on opposite sides of the conveying track. The light transmission change is detected by the thickness of the board 400. The corresponding threshold is set at the amplifier end of the through-beam optical fiber sensor, and the digital signal is output to the control system.

[0047] The reflective photoelectric sensor 301 is installed in one or a combination of the following arrangements: the reflective photoelectric sensor 301 is installed directly above the board 400; the reflective photoelectric sensor 301 is installed diagonally above the board 400; the reflective photoelectric sensor 301 is installed directly below the board 400.

[0048] The reflective photoelectric sensor 301 is mounted on the track substrate 100 via the bracket assembly 200 in at least three of the following detection layouts or a combination of the above detection layouts:

[0049] ① The reflective photoelectric sensor 301 is installed directly above the board 400. ② The reflective photoelectric sensor 301 is installed diagonally above the board 400. ③ The reflective photoelectric sensor 301 is installed directly below the board 400. Alternatively, it can be a combination of top and bottom layouts, diagonally top and bottom layouts, etc. Different detection layouts can be selected according to different detection requirements, providing flexibility and meeting the detection needs of various boards 400.

[0050] The through-beam photoelectric sensor 302 is located on the upper surface of the conveying track, or the transmitting end and receiving end of the through-beam photoelectric sensor 302 are located above and below the board 400, respectively, and at least one end of it is angle-adjustable through the bracket assembly 200.

[0051] The optical fiber transmitter and receiver of the through-beam photoelectric sensor 302 are both located above the surface of the conveyor track. One end of the through-beam photoelectric sensor 302 is located above the board 400, and the other end is located below the board 400. When the board 400 reaches the through-beam position of the sensor, it will block the transmitting and receiving optical paths, thereby realizing the detection of changes in optical flux.

[0052] In addition, the angle of one end (optical fiber transmitter or optical fiber receiver) of the through-beam photoelectric sensor 302 is adjustable. By adjusting the angle, the influence of changes in light flux with different track widths can be compensated, making the detection method more flexible and the detection results more accurate.

[0053] Example 2

[0054] like Figure 7As shown, this embodiment provides a board detection system, including a conveying mechanism and a control unit, and also includes at least three detection devices; the detection devices are arranged sequentially along the conveying direction of the board 400 on the conveying mechanism, and respectively realize the board entry sensing function, board stop sensing function, and board exit sensing function; the control unit is electrically connected to the conveying mechanism and the detection devices respectively.

[0055] In this embodiment, the detection system includes a conveying mechanism, a control unit, and at least three detection devices according to Embodiment 1. The at least three detection devices are arranged sequentially along the conveying direction of the upper plate 400 of the conveying mechanism to respectively realize the plate entry sensing function, the plate stop sensing function, and the plate exit sensing function.

[0056] When the sensor assembly 300 on the detection device adopts a reflective photoelectric sensor 301, the reflective photoelectric sensor 301 includes an infeed photoelectric sensor 701, a stop photoelectric sensor 702, and an outfeed photoelectric sensor 703. The main functions of the infeed photoelectric sensor 701, the stop photoelectric sensor 702, and the outfeed photoelectric sensor 703 are, in order, to determine that the board has entered the equipment, to trigger the stop photoelectric sensor of the board to control the belt conveyor to achieve a rapid stop function, and to determine that the board is about to be transported to the outside of the equipment.

[0057] When the sensor assembly 300 on the detection device adopts a through-beam photoelectric sensor 302, the through-beam photoelectric sensor 302 includes an inlet fiber optic sensor 801, a deceleration fiber optic sensor 802, a stop fiber optic sensor 803, and an outlet fiber optic sensor 804. The through-beam photoelectric sensor 302 has the same function as the reflective photoelectric sensor 301, and the detection method will not be described in detail here.

[0058] When more than four detection devices are used, a safety redundancy design is adopted so that if one set of detection devices fails, another set of detection devices can still work normally to ensure successful detection.

[0059] The detection device includes at least one reflective photoelectric sensor 301 and / or at least one through-beam photoelectric sensor 302. The sensor assembly 300 generates a signal change when the board 400 blocks or reflects the detection optical path. The control unit determines the position state of the board 400 based on the signal change.

[0060] The reflective photoelectric sensor 301 and the through-beam photoelectric sensor 302 can combine their respective detection advantages, select appropriate detection schemes according to different detection scenarios, and be integrated into a set of conveyor tracks to better meet the detection needs of board 400.

[0061] When the board 400 blocks or reflects the detection optical path, the sensor component 300 generates a signal change. The control unit determines the position of the board 400 on the conveyor track based on the signal change. The control unit can determine the position of the board 400 based on the board height, the relative position of the imaging component and the surface to be tested (e.g., when the imaging component is above the surface to be tested, the detection device can use a through-beam photoelectric sensor or a reflective photoelectric sensor set below), and the imaging requirements (e.g., when the imaging requirement is that the edge of the board image does not have a shadow area, when the imaging component is above the surface to be tested, the detection device can use a through-beam photoelectric sensor or a reflective photoelectric sensor set below). Based on the position of the board 400, the control unit controls the conveyor mechanism to perform board feeding, board stopping, or board ejection actions.

[0062] This utility model provides a circuit board testing device and testing system. The functions of each module in each device in the embodiments can be found in the corresponding description in the above method. It has the advantage of meeting the testing needs of various different circuit boards.

[0063] In this specification, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0064] In this invention, 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" of 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. The terms "vertical," "horizontal," "left," "right," "above," "below," and similar expressions are for illustrative purposes only and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0065] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A circuit board inspection device, installed on the conveyor track of an AOI (Automated Guided Inspection) device, characterized in that, include: Track base plate (100), support assembly (200), and sensor assembly (300); The sensor assembly (300) is mounted on the bracket assembly (200) in a position-adjustable and / or angle-adjustable manner; The bracket assembly (200) is connected to the track substrate (100) so that the detection optical path of the sensor assembly (300) can be aligned with the effective detection area of ​​the board (400) on the transport track.

2. The circuit board testing device according to claim 1, characterized in that, The support assembly (200) is connected to the track base plate (100) in a position-adjustable and / or angle-adjustable manner.

3. The circuit board testing device according to claim 2, characterized in that, The support assembly (200) includes a first support (500) which is connected to the track substrate (100) in a position adjustable along the X-axis of the transport track. The sensor assembly (300) is mounted on the projection area of ​​the board (400) and is mounted on the first support (500) in a position adjustable along the Y-axis of the transport track and / or in an angle adjustable around the X-axis.

4. The circuit board testing device according to claim 2, characterized in that, The support assembly (200) includes a second support (600) which is connected to the track substrate (100) in a position adjustable along the X-axis of the conveying track. The sensor assembly (300) is mounted on the projection area of ​​the track substrate (100) and is mounted on the second support (600) in an angle adjustable around the X-axis and / or around the Y-axis.

5. The circuit board testing device according to claim 4, characterized in that, The second bracket (600) includes a fixed end (601) and a movable end (602). The fixed end (601) is connected to the track base plate (100), and the movable end (602) is rotatably mounted on the fixed end (601). The sensor assembly (300) is mounted on the movable end (602).

6. The circuit board testing device according to claim 1, characterized in that, The sensor assembly (300) includes a reflective photoelectric sensor (301) and / or a through-beam photoelectric sensor (302). The transmitting end and receiving end of the through-beam photoelectric sensor (302) are respectively installed on opposite sides of the conveying track. The reflective photoelectric sensor (301) and the through-beam photoelectric sensor (302) are used to generate light spots adapted to the effective detection area of ​​the detection board (400).

7. The circuit board testing device according to claim 6, characterized in that, The mounting position of the reflective photoelectric sensor (301) includes one or a combination of the following arrangements: A reflective photoelectric sensor (301) is mounted directly above the board (400); The reflective photoelectric sensor (301) is mounted diagonally above the board (400); The reflective photoelectric sensor (301) is mounted directly below the board (400).

8. The circuit board testing device according to claim 6, characterized in that, The through-beam photoelectric sensor (302) is located on the upper surface of the conveying track, or the transmitting end and receiving end of the through-beam photoelectric sensor (302) are located above and below the board (400) respectively, and at least one end of it is angle-adjustable through the bracket assembly (200).

9. A circuit board testing system, comprising a conveying mechanism and a control unit, characterized in that: It also includes at least three detection devices as described in any one of claims 1-8; The detection devices are arranged sequentially along the conveying direction of the upper plate (400) of the conveying mechanism, and respectively realize the plate entry sensing function, plate stop sensing function and plate exit sensing function; The control unit is electrically connected to both the conveying mechanism and the detection device.

10. The board testing system according to claim 9, characterized in that, The detection device includes at least one reflective photoelectric sensor (301) and / or at least one through-beam photoelectric sensor (302). The sensor assembly (300) generates a signal change when the board (400) blocks or reflects the detection optical path. The control unit determines the position state of the board (400) based on the signal change.

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