Circuit board detection device

Abstract

The invention relates to the technical field of circuit board production equipment, and particularly provides a circuit board detection device. The detection device comprises a conveying guide rail and two visual cameras arranged above and below the conveying guide rail, a positioning clamp used for positioning and clamping a circuit board is installed and conveyed along the conveying guide rail, background frames are oppositely installed at the upper end and the lower end of the conveying guide rail, and the positioning clamp penetrates through the position between the two background frames in the conveying process. The two background frames are used for matching with the two visual cameras in a one-to-one correspondence manner to perform visual detection on the two surfaces of the circuit board; a switch assembly used for controlling the two vision cameras to be turned on is fixed to the conveying guide rail located on one side. The contrast of an image capturing environment is enhanced, the interference of shadows is eliminated, image features are highlighted, and then the precision of image detection and recognition is improved; in addition, the problems of response errors or response faults and the like caused by the fact that an existing sensor is prone to various interferences are solved, and reliability and stability of visual detection are improved.

Description

Technical Field

[0001] The invention relates to the technical field of circuit board production equipment, and specifically proposes a circuit board detection device. Background Art

[0002] In the production and manufacturing process of circuit boards, welding and fixing of electronic components is a key step in circuit board assembly. After effective welding, the reliability of electrical connection between electronic components and the stability of welding and fixing are ensured. Therefore, after completing the circuit board welding process, it is necessary to conduct quality inspection on the solder joints of the circuit board. Under the existing technology, in order to avoid detection omissions and improve detection efficiency, visual inspection is basically used to quickly detect the solder joints of the circuit board. In the visual inspection system, the image is captured by the camera lens, and the image is processed and analyzed by the background image processing system to determine whether there are defects in the welding.

[0003] Under the existing technology, camera lenses basically use sensors to achieve self-starting. Although sensors have advantages such as quick response, they are easily interfered by various factors such as ambient light, electromagnetism, vibration, temperature, humidity, noise, dust, obstacles, etc., so in actual use, there will be problems such as response errors or response failures, which affect the reliability and stability of work execution and increase the difficulty of subsequent maintenance; in addition, in the process of capturing images through visual detection, changes in the surrounding environment image and interference from shadows will also increase the difficulty of image analysis, thereby increasing the possibility of visual misjudgment and affecting detection accuracy. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a circuit board detection device, which is used to solve the problems mentioned in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a circuit board detection device, including a conveying rail and two visual cameras arranged above and below the conveying rail, a positioning fixture for positioning and clamping the circuit board is installed along the conveying rail, and background frames cooperating with the visual cameras on the same side are relatively installed at the upper and lower ends of the conveying rail, and the positioning fixture passes between the two background frames during the conveying process.

[0006] A switch assembly is fixed on one side of the conveying rail; the switch assembly includes a switch frame fixed on the conveying rail, on which are fixed two touch-pressure switches electrically connected to two visual cameras one-to-one; the switch frame is equipped with a horizontally movable side shift frame, on which are vertically oppositely equipped two vertical shift frames that move synchronously with the side shift frame, and touch-pressure rods for triggering touch-pressure switches at corresponding positions are horizontally fixed.

[0007] When the positioning fixture moves, it passes between two vertical moving frames. The positioning fixture jacks up the two vertical moving frames up and down, and makes the side moving frame move closer to the switch frame. When the side moving frame is closest to the switch frame, the touch rod correspondingly touches the touch switch, and the two vision cameras are turned on. When the positioning fixture is separated from the switch assembly, the side moving frame and the vertical moving frame automatically reset.

[0008] Preferably, the positioning fixture includes a fixture frame that moves horizontally along the conveying guide rail and has a rectangular frame structure. A supporting frame for horizontally placing the circuit board is fixedly arranged horizontally inside the fixture frame, and a clamping mechanism for clamping and positioning the circuit board is assembled on the supporting frame.

[0009] Preferably, the side moving frame includes a U-shaped plate that is horizontally slidably mounted on the switch frame. The notch of the U-shaped plate faces the positioning fixture, and the U-shaped plate is elastically connected to the switch frame. The two vertical moving frames are assembled on the U-shaped plate. A V-shaped block is fixedly arranged on the U-shaped plate, and the outer V-shaped surface of the V-shaped block is arranged正对 to the sliding direction of the U-shaped plate. A touch wheel is vertically rotatably mounted on the fixture frame. When the positioning fixture moves along the conveying guide rail, the touch wheel rolls and contacts with the outer V-shaped surface of the V-shaped block.

[0010] Preferably, two sliding plates are symmetrically fixed on two outer side walls at opposite positions of the fixture frame. The fixture frame moves between the conveying guide rails through the two sliding plates. The vertical moving frame includes a guide post that is vertically slidably mounted on the U-shaped plate. One end of the guide post is fixedly provided with a roller frame, and the roller frame is located inside the notch of the U-shaped plate. The touch rod is horizontally fixedly arranged at the other end of the guide post, and the touch rod is biased towards the switch frame. The roller frame is elastically connected to the U-shaped plate, and a roller is horizontally rotatably mounted on the roller frame. When the sliding plate moves, it rolls and contacts with the rollers in the two vertical moving frames.

[0011] Preferably, the supporting frame is provided with a rectangular window. The clamping mechanism includes two first clamping strips that are horizontally and relatively slidably mounted on the supporting frame and two second clamping strips that are horizontally and relatively slidably mounted on the supporting frame. The two first clamping strips and the two second clamping strips are arranged around the window of the supporting frame. Two driving components for driving the two first clamping strips and the two second clamping strips to synchronously clamp the circuit board are also assembled on the supporting frame.

[0012] Preferably, the driving component includes a plurality of shaft seats fixed on the supporting frame. A bidirectional lead screw is horizontally rotatably mounted on the plurality of shaft seats. Both threaded sections of the bidirectional lead screw are threadedly connected with driving blocks. The first clamping strip is fixed between two driving blocks in relative positions in the two driving components. Connecting rods are hinged on the driving blocks. One second clamping strip is hinged on the two connecting rods in one driving component, and the other second clamping strip is hinged on the two connecting rods in the other driving component.

[0013] Preferably, a rectangular window is opened on the background frame to avoid circuit board detection; a light bar is installed around the rectangular window on the background frame, and the light bar is located on the frame surface facing away from the visual camera on the same side.

[0014] Preferably, the No. 1 clamping bar and the No. 2 clamping bar both have a side clamping surface for laterally clamping the circuit board and a downward pressing surface for pressing down to fit the circuit board.

[0015] Preferably, a touch pressure head for contacting with the touch pressure switch is fixed to the end of the touch pressure rod.

[0016] The above technical scheme has the following advantages or beneficial effects: The present invention provides a circuit board detection device, which enhances the contrast of the image capture environment, eliminates the interference of shadows, highlights the image features, and then improves the accuracy of image detection and recognition by setting background frames above and below and setting light strips distributed around the windows of the background frame; in addition, a positioning fixture is used to position the circuit board for visual detection, and a switch assembly is fixedly arranged relative to the background frame. In the process of moving the circuit board, the automatic start control of the visual camera is realized by the touch-pressure switch assembly. It is a pure mechanical touch-pressure switch structure, which replaces the existing widely used sensor start-up method, solves the problem that the existing sensors are susceptible to various interferences and have response errors or response failures, and improves the reliability and stability of visual detection. In addition, the switch assembly adopts a two-stage top touch-pressure start-up method. On the one hand, it can cooperate with the background frame to start the visual detection at a fixed point to ensure the uniformity of the detection position. On the other hand, it basically avoids the situation of the visual camera being started by accident, reduces the interference of irrelevant image capture, and improves the detection efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention and its features, configurations and advantages will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts throughout the drawings, which are not drawn to scale, with emphasis on illustrating the subject matter of the present invention.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of a circuit board detection device provided by the present invention.

[0019] Figure 2 It is a front view of a circuit board detection device provided by the present invention.

[0020] Figure 3 It is a three-dimensional structural diagram of a circuit board detection device provided by the present invention when a background frame is not assembled.

[0021] Figure 4 It is a three-dimensional structural diagram of the assembly structure of the clamping mechanism and the supporting frame.

[0022] Figure 5 It is a three-dimensional structure diagram of the assembly structure of the clamping mechanism and the supporting frame from another perspective.

[0023] Figure 6 It is a three-dimensional structure diagram of the switch assembly.

[0024] In the figure: 1. Conveyor guide rail; 2. Positioning fixture; 21. Fixture frame; 211. Slide plate; 212. Touching wheel; 22. Supporting frame; 221. Guide notch; 23. Clamping mechanism; 231. First clamping strip; 232. Second clamping strip; 233. Driving component; 2331. Shaft seat; 2332. Bi-directional lead screw; 2333. Driving block; 2334. Connecting rod; 3. Background frame; 31. Light bar; 4. Switch assembly; 41. Switch frame; 42. Touching switch; 43. Side-shifting frame; 431. C-shaped plate; 432. Guide rod; 433. First spring; 434. V-shaped block; 44. Vertical-shifting frame; 441. Guide post; 442. Roller frame; 443. Second spring; 444. Roller; 45. Touching rod; 451. Touching head; 5. Vision camera. Specific implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] In order to enable those skilled in the art of this technology to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] As Figure 1 and Figure 2As shown, a circuit board inspection device includes a conveying rail 1 and two visual cameras 5 arranged above and below the conveying rail 1. It should be noted that the conveying rail 1 is a guiding structure for horizontally conveying circuit boards in the conveying system of the existing inspection device. The device has an existing visual inspection system. The existing visual inspection system generally includes a lighting component, a camera and lens for capturing images, an image acquisition card for receiving and transmitting image digital information, image processing software and a computing platform for processing and analyzing image digital information, a communication module, a control system and other components; the two visual cameras 5 are both execution devices for capturing images in the visual inspection system, including a lens part, and the visual cameras 5 are correspondingly installed on a special camera rack, which is not shown in the figure. A positioning fixture 2 for positioning and clamping a circuit board is installed along the conveying guide rail 1, and background frames 3 are relatively installed at the upper and lower ends of the conveying guide rail 1. The positioning fixture 2 passes between the two background frames 3 during conveying. The two background frames 3 are used to cooperate with two visual cameras 5 to perform visual inspection on both sides of the circuit board in a one-to-one manner; a rectangular window is opened on the background frame 3 to avoid circuit board inspection. The inspection device provided by the present invention is used to perform solder joint visual inspection on circuit boards of specific sizes. When the positioning fixture 2 drives the circuit board to move to the middle of the upper and lower background frames 3, all solder joint positions on both sides of the circuit board are located within the range of the rectangular window, and the visual camera 5 can capture an image of a single side of the circuit board through the rectangular window; the frame surface of the background frame 3 is horizontal and the color is uniform, which can enhance the contrast around the image capture area. In addition, a light bar 31 is installed around the rectangular window on the background frame 3, and the light bar 31 is located on the frame surface of the visual camera 5 on the same side. The light bar 31 can use a white light source. By distributing the light source around the visual capture area, the influence of shadows is eliminated, and the features and defects on the circuit board can be further highlighted, thereby improving the inspection accuracy.

[0028] like Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the positioning fixture 2 includes a fixture frame 21 with a rectangular frame structure, and slide plates 211 are symmetrically welded on two outer side walls at relative positions on the fixture frame 21. The fixture frame 21 moves between the conveying guide rails 1 through the two slide plates 211; a supporting frame 22 for horizontally placing the circuit board is horizontally welded inside the fixture frame 21, and a clamping mechanism 23 for clamping and positioning the circuit board is assembled on the supporting frame 22. The supporting frame 22 is provided with a rectangular window, and two guide notches 221 are provided at each frame edge of the supporting frame 22 relative to the window; the clamping mechanism 23 includes two No. 1 clamps 231 horizontally relatively slidably mounted on the supporting frame 22 and two No. 2 clamps 232 horizontally relatively slidably mounted on the supporting frame 22; the two No. 1 clamps 231 and the two No. 2 clamps 232 are arranged around the window of the supporting frame 22, and the No. 1 clamps 231 and the No. 2 clamps 232 are both slidably mounted in the two guide notches 221 at corresponding positions; the supporting frame 22 is also equipped with two driving components 233 that drive the two No. 1 clamps 231 and the two No. 2 clamps 232 to synchronously clamp the circuit board. The driving assembly 233 includes two shaft seats 2331 welded on the supporting frame 22, and bidirectional screws 2332 are horizontally rotatably installed on the two shaft seats 2331, and the two threaded sections of the bidirectional screws 2332 are threadedly connected to the driving blocks 2333; the No. 1 clamp 231 is welded between the two driving blocks 2333 in relative positions in the two driving assemblies 233; the driving blocks 2333 are hinged with connecting rods 2334; a No. 2 clamp 232 is hinged on the two connecting rods 2334 in one driving assembly 233, and the other No. 2 clamp 232 is hinged on the two connecting rods 2334 in the other driving assembly 233; both bidirectional screws 2332 can be connected to the output shaft of a micro motor (the micro motor is not shown in the figure), and the micro motor can be fixed to the outer wall of the clamp frame 21 by screws. In order to make the circuit board present a horizontal clamping state as a whole, both the first clamping bar 231 and the second clamping bar 232 have side clamping surfaces for clamping the circuit board laterally and downward pressing surfaces for pressing the circuit board downward.

[0029] When positioning and clamping the circuit board, first place the circuit board flat on the support frame 22, then start the two micro motors synchronously, so that the two bidirectional lead screws 2332 rotate synchronously, the two bidirectional lead screws 2332 drive the two No. 1 clamps 231 to slide towards each other, and synchronously drive the two No. 2 clamps 232 to slide towards each other through four connecting rods 2334, and then position and clamp the circuit board between the two No. 1 clamps 231 and the two No. 2 clamps 232; it should be added here that in order to facilitate the subsequent rapid image analysis, the circuit board is placed on the support frame 22 in the same placement state each time. The positioning and clamping of the circuit board by the positioning fixture 2 makes the position of the circuit board uniform during each detection process, reduces the influence of the position state on the detection accuracy, and also improves the subsequent analysis response speed of the image.

[0030] As Figure 2 , Figure 3 and Figure 6 shown, a switch assembly 4 for controlling the opening of two vision cameras 5 is fixed on one side conveying guide rail 1. A notch for avoiding the switch assembly 4 is formed on this side conveying guide rail 1. The switch assembly 4 is arranged in the middle in the direction of the conveying guide rail 1 relative to the background frame 3 as a whole. The switch assembly 4 includes a switch frame 41 fixed to the side wall of the conveying guide rail 1 by bolts. Two touch switches 42 electrically connected to the two vision cameras 5 in one-to-one correspondence are horizontally and penetratingly embedded and fixed on the switch frame 41. A side shift frame 43 is assembled on the switch frame 41. The side shift frame 43 includes a C-shaped plate 431. The notch of the C-shaped plate 431 faces the positioning fixture 2. Two guide rods 432 that are horizontally slidably matched with the switch frame 41 are welded on the C-shaped plate 431. A first spring 433 is sleeved on the guide rods 432. Two ends of the first spring 433 are respectively welded to the switch frame 41 and the C-shaped plate 431. A V-shaped block 434 is welded on the upper side plate of the C-shaped plate 431. The outer V-shaped surface of the V-shaped block 434 is arranged facing the sliding direction of the C-shaped plate 431. A touch wheel 212 is vertically rotatably installed on the fixture frame 21. When the positioning fixture 2 moves along the conveying guide rail 1, the touch wheel 212 rolls and contacts the outer V-shaped surface of the V-shaped block 434.

[0031] As Figure 2 , Figure 3 and Figure 6 shown, vertical shift frames 44 are correspondingly assembled on the upper and lower side plates of the C-shaped plate 431. The two vertical shift frames 44 are arranged vertically and oppositely. The vertical shift frame 44 includes a guide post 441 vertically and slidably installed on the side plate of the C-shaped plate 431. The guide post 441 has a square cross-section. One end of the guide post 441 is welded with a roller frame 442. The roller frame 442 is located in the notch of the C-shaped plate 431. The other end of the guide post 441 is horizontally welded with a touch rod 45. The touch rod 45 is biased towards the switch frame 41. A second spring 443 is sleeved on the guide post 441. Two ends of the second spring 443 are respectively welded to the C-shaped plate 431 and the roller frame 442. A roller 444 is horizontally rotatably installed on the roller frame 442. When the slide plate 211 moves, it rolls and contacts the rollers 444 in the two vertical shift frames 44. The touch rods 45 installed on the two vertical shift frames 44 are used to touch the two touch switches 42 in one-to-one correspondence. A touch head 451 that touches and contacts the touch switch 42 is fixed to the end of the touch rod 45.

[0032] After the circuit board is positioned and clamped, the positioning fixture 2 can be used to indirectly drive the circuit board to move to complete visual inspection. During the movement, the two slides 211 move horizontally along the conveying guide rail 1, and the slide 211 on one side will pass between the two rollers 444. The slide 211 touches up and down, causing the two rollers 444 to move away from each other. The second spring 443 is compressed, and the two touch-pressure rods 45 move up and down synchronously, so that the two touch-pressure rods 45 are horizontally aligned with the two touch-pressure switches 42 one by one; as the movement proceeds, the touch-pressure wheel 212 moves along the outer V-shaped surface of the V-shaped block 434 and continuously touches the V-shaped block 434. The first spring 433 is gradually compressed, causing the two touch-pressure rods 45 and the two guide pillars 441 to move with the touch-pressure wheel 212. The V-shaped plate 431 synchronously moves toward the direction approaching the switch frame 41, and the touch-pressure rod 45 approaches the touch-pressure switch 42 accordingly. When the touch-pressure wheel 212 rolls to contact the vertex of the outer V-shaped surface of the V-shaped block 434, the distance between the V-shaped plate 431 and the switch frame 41 is closest. In this embodiment, the circuit board just moves to the middle position of the upper and lower background frames 3. At this time, the movement of the positioning fixture 2 is suspended, and the touch-pressure heads 451 of the two touch-pressure rods 45 just press on the touch-pressure switch 42, so that the two visual cameras 5 are turned on synchronously. The upper and lower visual cameras 5 capture images of both sides of the circuit board through the windows of the two background frames 3, and the images are further analyzed through the entire visual inspection system to confirm whether there are welding defects on both sides of the circuit board.

[0033] After completing the visual inspection, the positioning fixture 2 continues to move, and the touch-pressure wheel 212 is separated from the top position of the V-block 434. Under the elastic force of the No. 1 spring 433, the V-shaped plate 431 is automatically reset, and the touch-pressure rod 45 is separated from the touch-pressure switch 42, and the touch-pressure switch 42 rebounds and closes, and the visual camera 5 is paused and started. When the slide plate 211 is separated from the roller 444, the side shift frame 43 is reset under the elastic force of the No. 2 spring 443; when inspecting the next circuit board, the positioning fixture 2 only needs to move in the opposite direction. When the positioning fixture 2 performs a single reciprocating movement along the conveying guide rail 1, two circuit boards can be visually inspected.

[0034] In the present invention, by setting the background frame 3 up and down, and setting the light strips 31 distributed around the window of the background frame 3, the contrast of the image capture environment is enhanced, the interference of shadows is eliminated, the image features are highlighted, and then the accuracy of image detection and recognition is improved; in addition, a positioning fixture 2 is used to position the circuit board for visual detection, and a switch assembly 4 is fixedly arranged relative to the background frame 3. In the process of moving the circuit board, the automatic start control of the visual camera 5 is realized by the touch-pressure switch 42 assembly 4. It is a pure mechanical touch-pressure switch structure, which replaces the existing widely used sensor start-up method, solves the problem that the existing sensor is susceptible to various interferences and has response errors or response failures, and improves the reliability and stability of visual detection. In addition, the switch assembly 4 adopts a two-stage top touch-pressure start-up method. On the one hand, it can cooperate with the background frame 3 to start the visual detection at a fixed point to ensure the uniformity of the detection position. On the other hand, it basically avoids the situation of accidental touch start of the visual camera 5, reduces the interference of irrelevant image capture, and improves the detection efficiency and accuracy.

[0035] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0037] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify them into equivalent embodiments with equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A circuit board inspection device, comprising a conveying rail (1) and two visual cameras (5) arranged above and below the conveying rail (1), characterized in that: A positioning fixture (2) for positioning and clamping a circuit board is installed along the conveying guide rail (1). Background frames (3) cooperating with the vision cameras (5) on the same side are oppositely installed at the upper and lower ends of the conveying guide rail (1). The positioning fixture (2) passes through between the two background frames (3) during the conveying process. A switch assembly (4) is fixed on one side of the conveying guide rail (1). The switch assembly (4) includes a switch frame (41) fixed on the conveying guide rail (1). Two touch switches (42) electrically connected to the two vision cameras (5) one by one are fixed on the switch frame (41). A side shift frame (43) moving horizontally is assembled on the switch frame (41). Two vertical shift frames (44) moving synchronously with it are vertically and oppositely assembled on the side shift frame (43). Touch pressure rods (45) for touching the touch switches (42) at corresponding positions are horizontally fixed on the two vertical shift frames (44). When the positioning fixture (2) moves, it passes through between the two vertical shift frames (44). The positioning fixture (2) pushes the two vertical shift frames (44) upward and downward, and makes the side shift frame (43) move closer to the switch frame (41). When the side shift frame (43) is closest to the switch frame (41), the touch pressure rod (45) touches the touch switch (42) correspondingly, and the two vision cameras (5) are turned on. When the positioning fixture (2) is separated from the switch assembly (4), the side shift frame (43) and the vertical shift frames (44) are automatically reset.

2. A circuit board detection device according to claim 1, characterized in that: The positioning fixture (2) includes a fixture frame (21) moving horizontally along the conveying guide rail (1) and having a rectangular frame structure. A supporting frame (22) for horizontally placing the circuit board is horizontally fixed inside the fixture frame (21). A clamping mechanism (23) for clamping and positioning the circuit board is assembled on the supporting frame (22).

3. A circuit board detection device according to claim 2, characterized in that: The side shift frame (43) includes a U-shaped plate (431) slidably installed horizontally on the switch frame (41). The notch of the U-shaped plate (431) faces the positioning fixture (2), and the U-shaped plate (431) is elastically connected to the switch frame (41). The two vertical shift frames (44) are assembled on the U-shaped plate (431). A V-shaped block (434) is fixed on the U-shaped plate (431). The outer V-shaped surface of the V-shaped block (434) is arranged正对 to the sliding direction of the U-shaped plate (431). A touch pressure wheel (212) is vertically rotatably installed on the fixture frame (21). When the positioning fixture (2) moves along the conveying guide rail (1), the touch pressure wheel (212) rolls in contact with the outer V-shaped surface of the V-shaped block (434).

4. A circuit board detection device according to claim 3, characterized in that: On two outer sidewalls at opposite positions on the fixture frame (21), slide plates (211) are symmetrically fixed, and the fixture frame (21) moves between the conveying guide rails (1) through the two slide plates (211); the vertical moving frame (44) includes guide posts (441) vertically and slidably mounted on the C-shaped plate (431), one end of the guide posts (441) is fixed with a roller frame (442), the roller frame (442) is located within the notch of the C-shaped plate (431), the touch pressure rod (45) is horizontally fixed at the other end of the guide posts (441), and the touch pressure rod (45) biases towards the proximity of the switch frame (41); the roller frame (442) is elastically connected to the C-shaped plate (431), and a roller (444) is horizontally rotatably mounted on the roller frame (442); when the slide plate (211) moves, it makes rolling contact with the rollers (444) in the two vertical moving frames (44).

5. A circuit board detection device according to claim 2, characterized in that: The support frame (22) is provided with a rectangular window, and the clamping mechanism (23) includes two first clamping bars (231) horizontally and relatively slidably mounted on the support frame (22) and two second clamping bars (232) horizontally and relatively slidably mounted on the support frame (22); the two first clamping bars (231) and the two second clamping bars (232) are arranged around the window of the support frame (22); the support frame (22) is further equipped with a driving assembly (233) for driving the two first clamping bars (231) and the two second clamping bars (232) to synchronously clamp the circuit board.

6. A circuit board detection device according to claim 5, characterized in that: The driving assembly (233) includes a plurality of seat blocks (2331) fixed on the support frame (22), a bidirectional lead screw (2332) is horizontally rotatably mounted on the plurality of seat blocks (2331), and two threaded sections of the bidirectional lead screw (2332) are both threadedly connected with driving blocks (2333); the first clamping bar (231) is fixed between two driving blocks (2333) at opposite positions in the two driving assemblies (233); connecting rods (2334) are hinged on the driving blocks (2333); one of the second clamping bars (232) is hinged on the two connecting rods (2334) in one driving assembly (233), and the other second clamping bar (232) is hinged on the two connecting rods (2334) in the other driving assembly (233).

7. A circuit board detection device according to claim 1, characterized in that: The background frame (3) is provided with a rectangular window for avoiding the detection of the circuit board; around the rectangular window on the background frame (3), a light bar (31) is assembled, and the light bar (31) is located on the frame surface facing away from the visual camera (5) on the same side.

8. A circuit board detection device according to claim 5, characterized in that: Both the first clamping bar (231) and the second clamping bar (232) have side clamping surfaces for clamping the circuit board laterally and a pressing surface for pressing and fitting the circuit board downward.

9. A circuit board detection device according to claim 1, characterized in that: A touch pressure head (451) for making touch contact with the touch switch (42) is fixed at the end of the touch pressure rod (45).

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