A circuit board detection device

Abstract

The present invention relates to the technical field of circuit board production equipment, and specifically provides a circuit board detection device; the detection device includes a conveying guide rail and two vision cameras arranged above and below the conveying guide rail. A positioning fixture for positioning and clamping the circuit board is installed and conveyed along the conveying guide rail. Background frames are relatively installed at the upper and lower ends of the conveying guide rail. The positioning fixture passes through between the two background frames during the conveying process. The two background frames are used to cooperate with the two vision cameras respectively to perform vision detection on both sides of the circuit board. A switch assembly for controlling the two vision cameras to turn on is fixed on one side of the conveying guide rail. The contrast of the image capture environment is enhanced, the interference of shadows is eliminated, the image features are highlighted, and thus the accuracy of image detection and recognition is improved; in addition, the problems that existing sensors are easily affected by various interferences and have response errors or response failures are solved, and the reliability and stability of vision detection are improved.

Description

Technical Field

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

[0002] In the production and manufacturing process of circuit boards, the welding and fixing of electronic components is a key step in circuit board assembly. After effective welding, it is necessary to ensure the reliability of the electrical connection between electronic components and the stability of the welding and fixing. Therefore, after the circuit board welding process is completed, it is essential to detect the quality of the solder joints of the circuit board. In the prior art, in order to avoid detection omissions and improve detection efficiency, the visual detection method is basically used to quickly detect the solder joints of the circuit board. In the visual detection system, image capture is performed through a camera lens, and the image is processed and analyzed by a background image processing system to determine whether there are defects at the welding points.

[0003] In the prior art, the camera lens basically uses a sensor to achieve self-start. Although the sensor has advantages such as rapid response, it is easily interfered by various factors such as ambient light, electromagnetism, vibration, temperature, humidity, noise, dust, and obstacles. Therefore, in the actual use process, there will be problems such as response errors or response failures, which affect the reliability and stability of work execution and also increase the difficulty of subsequent maintenance; in addition, during the process of capturing images through visual detection, the changes in the surrounding environment images and the interference of shadows will also increase the difficulty of image analysis, and then increase the possibility of visual misjudgment, affecting the detection accuracy. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a circuit board detection device for solving the problems mentioned in the above background art.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A circuit board detection device includes a conveying guide rail and two visual cameras arranged above and below the conveying guide rail. A positioning fixture for positioning and clamping the circuit board is installed and conveyed along the conveying guide rail. Background frames are relatively installed at the upper and lower ends of the conveying guide rail and are matched with the visual cameras on the same side. The positioning fixture passes through between the two background frames during the conveying process.

[0006] A switch assembly is fixed on one side of the conveying guide rail; the switch assembly includes a switch frame fixed on the conveying guide rail, and two touch switches corresponding to the two visual cameras are fixedly arranged on the switch frame; a side shift frame that moves horizontally is assembled on the switch frame, and two vertical shift frames that move synchronously with it are vertically and relatively assembled on the side shift frame. Touch pressure rods that touch the touch switches at corresponding positions are horizontally fixed on the two vertical shift frames.

[0007] When the positioning fixture moves, it passes between the two vertical moving frames, and the positioning fixture pushes 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 pressure rod correspondingly touches the touch pressure switch, and the two visual cameras are turned on; when the positioning fixture is separated from the switch assembly, the side moving frame and the vertical moving frame are automatically reset.

[0008] Preferably, the positioning fixture comprises a fixture frame which moves horizontally along the conveying guide rail and has a rectangular frame structure, a supporting frame for horizontally placing the circuit board is horizontally fixed in the fixture frame, and a clamping mechanism for clamping and positioning the circuit board is mounted on the supporting frame.

[0009] Preferably, the side shift frame includes a 匚-shaped plate horizontally slidably mounted on the switch frame, the notch of the 匚-shaped plate faces the positioning fixture, and the 匚-shaped plate and the switch frame are elastically connected; the two vertical shift frames are assembled on the 匚-shaped plate; a V-shaped block is fixed on the 匚-shaped plate, and the outer V-shaped surface of the V-shaped block is arranged opposite to the sliding direction of the 匚-shaped plate; a touch-pressure wheel is vertically rotatably mounted on the fixture frame; when the positioning fixture moves along the conveying guide rail, the touch-pressure wheel rolls in contact with the outer V-shaped surface of the V-shaped block.

[0010] Preferably, slides are symmetrically fixed on two outer walls at relative positions on the clamp frame, and the clamp frame moves between the conveying guide rails through the two slides; the vertical moving frame includes a guide column vertically slidably installed on the 匚-shaped plate, and a roller frame is fixed at one end of the guide column, and the roller frame is located in the recess of the 匚-shaped plate, and the touch-pressure rod is horizontally fixed at the other end of the guide column, and the touch-pressure rod is biased close to the switch frame; the roller frame is elastically connected to the 匚-shaped plate, and rollers are horizontally rotatably installed on the roller frame; when the slide 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, and the clamping mechanism includes two No. 1 clamping bars mounted on the supporting frame for horizontal relative sliding and two No. 2 clamping bars mounted on the supporting frame for horizontal relative sliding; the two No. 1 clamping bars and the two No. 2 clamping bars are arranged around the window of the supporting frame; the supporting frame is also equipped with two driving components for driving the two No. 1 clamping bars and the two No. 2 clamping bars to clamp the circuit board synchronously.

[0012] Preferably, the driving assembly includes a plurality of shaft seats fixed on a supporting frame, and a bidirectional lead screw is horizontally rotatably mounted on the plurality of shaft seats, and the two threaded sections of the bidirectional lead screw are threadedly connected to a driving block; the No. 1 clamp is fixed between two driving blocks in relative positions in the two driving assemblies; connecting rods are hinged on the driving blocks; one of the No. 2 clamps is hinged on two connecting rods in one driving assembly, and the other of the No. 2 clamp is hinged on two connecting rods in another driving assembly.

[0013] Preferably, a rectangular window for avoiding circuit board detection is provided on the background frame; a light bar is assembled around the four sides of the rectangular window on the background frame, and the light bar is located on the frame surface facing away from the same-side vision camera.

[0014] Preferably, both the first clamping bar and the second clamping bar have a side clamping surface for laterally clamping the circuit board and a pressing surface for pressing and fitting the circuit board downward.

[0015] Preferably, a pressing head that is in pressing contact with the touch switch is fixed to the end of the pressing rod.

[0016] The above technical solution has the following advantages or beneficial effects: The present invention provides a circuit board detection device. By arranging the background frame up and down and arranging the light bars distributed around the window of the background frame, 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 is used for visual detection and positioning of the circuit board, and a switch assembly is fixedly arranged relative to the background frame. During the process of moving the circuit board, the automatic opening control of the vision camera is realized by touching the switch assembly. It is a pure mechanical touch switch structure, replacing the existing widely used sensor activation method, solving the problems that the existing sensors are vulnerable to various interferences and have response errors or response failures, etc., improving the reliability and stability of visual detection. In addition, the switch assembly adopts a two-stage top-touch activation method. On the one hand, it can cooperate with the background frame to start visual detection at a fixed point to ensure the unity of the detection position. On the other hand, the situation of accidental touch activation of the vision camera is basically avoided, reducing the interference of irrelevant image capture to improve the detection efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, the present invention and its features, shape, and advantages will become more obvious. The same reference numerals indicate the same parts in all the drawings. The drawings are not deliberately drawn to scale, and the focus is on showing the gist of the present invention.

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

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

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

[0021] Figure 4 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 pressure wheel; 22. Supporting frame; 221. Guide notch; 23. Clamping mechanism; 231. First clamping strip; 232. Second clamping strip; 233. Driving assembly; 2331. Axle 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 pressure 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 pressure rod; 451. Touching pressure 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 of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0026] In order to enable those in the technical field 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 in the figure, a circuit board detection device includes a conveying guide rail 1 and two vision cameras 5 arranged above and below the conveying guide rail 1. It should be noted that the conveying guide rail 1 is a guiding and guiding structure for horizontal conveyance of circuit boards in the conveying system of existing detection devices. This device has an existing vision detection system, which generally includes components such as an illumination assembly, a camera and lens for image capture, an image acquisition card for receiving and transmitting image digital information, an image processing software and computing platform for processing and analyzing image digital information, a communication module, and a control system. The two vision cameras 5 are both execution devices for capturing images in the vision detection system and include lens parts. The vision cameras 5 are correspondingly installed on a dedicated camera rack, which is not shown in the figure. A positioning fixture 2 for positioning and clamping the circuit board is installed and conveyed along the conveying guide rail 1. Background frames 3 are relatively 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. The two background frames 3 are used to cooperate with the two vision cameras 5 one by one to perform vision detection on both sides of the circuit board. A rectangular window for avoiding circuit board detection is opened on the background frame 3. The detection device provided by the present invention is used for solder joint vision detection of circuit boards with specific dimensions. When the positioning fixture 2 drives the circuit board to move to the exact middle between the upper and lower background frames 3, all the solder joint positions on both sides of the circuit board are within the range of the rectangular window. The vision camera 5 can capture an image of one side of the circuit board through the rectangular window. The frame surface of the background frame 3 is horizontal and has a uniform color, which can enhance the contrast around the image capture area. In addition, light strips 31 are assembled around the rectangular window on the background frame 3, and the light strips 31 are located on the frame surface facing away from the same-side vision camera 5. The light strips 31 can use white light sources. By distributing light sources around the vision capture area, the influence of shadows can be eliminated, and the features and defects on the circuit board can be further highlighted, thereby improving the detection accuracy.

[0028] As Figure 2 , Figure 3 , Figure 4 and Figure 5As shown in the figure, the positioning fixture 2 includes a fixture frame 21 in a rectangular frame structure. Two sliding plates 211 are symmetrically welded on two outer side walls at opposite positions on the fixture frame 21. The fixture frame 21 moves between the conveying guide rails 1 through the two sliding 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 guiding notches 221 are provided at each frame edge of the supporting frame 22 opposite to the window. The clamping mechanism 23 includes two first clamping bars 231 horizontally and relatively slidably mounted on the supporting frame 22 and two second clamping bars 232 horizontally and relatively slidably mounted on the supporting frame 22. The two first clamping bars 231 and the two second clamping bars 232 are arranged around the window of the supporting frame 22, and the first clamping bars 231 and the second clamping bars 232 are slidably mounted in the two guiding notches 221 at corresponding positions. Two driving components 233 for driving the two first clamping bars 231 and the two second clamping bars 232 to synchronously clamp the circuit board are also assembled on the supporting frame 22. The driving component 233 includes two shaft seats 2331 welded on the supporting frame 22. A bidirectional lead screw 2332 is horizontally rotatably mounted on the two shaft seats 2331. Two driving blocks 2333 are threadedly connected to the two threaded sections of the bidirectional lead screw 2332. The first clamping bar 231 is welded between the two driving blocks 2333 at opposite positions in the two driving components 233. Connecting rods 2334 are hinged on the driving blocks 2333. One second clamping bar 232 is hinged on the two connecting rods 2334 in one driving component 233, and the other second clamping bar 232 is hinged on the two connecting rods 2334 in the other driving component 233. The two bidirectional lead 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 on the outer side wall of the fixture frame 21 by screws. In order to make the circuit board present a horizontally clamped state as a whole, the first clamping bar 231 and the second clamping bar 232 both have a side clamping surface for laterally clamping the circuit board and a pressing surface for pressing and fitting the circuit board.

[0029] When positioning and clamping the circuit board, first place the circuit board flat on the supporting frame 22, and 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 first clamping bars 231 to slide towards each other and approach, and synchronously drive the two second clamping bars 232 to slide towards each other and approach through the four connecting rods 2334, thereby positioning and clamping the circuit board between the two first clamping bars 231 and the two second clamping bars 232. It should be added here that in order to facilitate subsequent rapid image analysis, the circuit board is placed on the supporting frame 22 in the same placement state each time. Through the positioning and clamping of the circuit board by the positioning fixture 2, the position of the circuit board is unified in each detection process, reducing the influence of the position state on the detection accuracy and also improving 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 the 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 slidably matched with the switch frame 41 horizontally 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 on 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 with 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 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 on 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 with 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 for touch contact with the touch switch 42 is fixed at the end of the touch rod 45.

[0032] After the circuit board is positioned and clamped, the circuit board can be indirectly driven to move by the positioning fixture 2 to complete the visual inspection. During the movement, the two sliding plates 211 move horizontally along the conveying guide rail 1. One of the sliding plates 211 passes between the two rollers 444. The sliding plate 211 causes the two rollers 444 to move away from each other by pressing up and down, compressing the second spring 443. The two pressure contact rods 45 move away from each other synchronously up and down, so that the two pressure contact rods 45 are horizontally aligned with the two pressure contact switches 42 one by one. As the movement progresses, the pressure contact wheel 212 moves along the outer V-shaped surface of the V-shaped block 434 and continuously presses against the V-shaped block 434, gradually compressing the first spring 433, causing the two pressure contact rods 45 and the two guide posts 441 to move synchronously with the U-shaped plate 431 in the direction closer to the switch frame 41. The pressure contact rod 45 then approaches the pressure contact switch 42. When the pressure contact wheel 212 rolls to contact the vertex of the outer V-shaped surface of the V-shaped block 434, the distance between the U-shaped plate 431 and the switch frame 41 is the closest. In this embodiment, the circuit board just moves to the exact middle position between the upper and lower background frames 3. At this time, the movement of the positioning fixture 2 pauses, and the pressure contact heads 451 of the two pressure contact rods 45 just press on the pressure contact switches 42, causing the two vision cameras 5 to be turned on synchronously. The upper and lower vision cameras 5 capture images of both sides of the circuit board through the windows of the two background frames 3, and further analyze the images through the entire visual inspection system to confirm whether there are welding defects on both sides of the circuit board.

[0033] After the visual inspection is completed, the positioning fixture 2 continues to move, and the pressure contact wheel 212 separates from the vertex position of the V-shaped block 434. Under the elastic force of the first spring 433, the U-shaped plate 431 automatically resets, the pressure contact rod 45 separates from the pressure contact switch 42, the pressure contact switch 42 rebounds and closes, and the vision camera 5 pauses to start. When the sliding plate 211 separates from the roller 444, under the elastic force of the second spring 443, the side shift frame 43 resets. When detecting the next circuit board, the positioning fixture 2 only needs to move in the reverse direction. When the positioning fixture 2 makes a single reciprocating movement along the conveying guide rail 1, the visual inspection of two circuit boards can be completed.

[0034] In the present invention, by arranging the background frame 3 vertically, and arranging the light bars 31 distributed around through the windows 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 thus the accuracy of image detection and recognition is improved; in addition, a positioning fixture 2 is used to perform visual detection and positioning on the circuit board, and a switch assembly 4 is fixedly arranged relative to the background frame 3. During the process of moving the circuit board, the visual camera 5 is automatically turned on by pressing the switch assembly 4. It is a pure mechanical pressing switch structure, replacing the existing widely used sensor activation method, solving the problems that the existing sensors are vulnerable to various interferences and have response errors or response failures, etc., improving the reliability and stability of visual detection. In addition, the switch assembly 4 adopts a two-stage top-touch pressing activation method. On the one hand, it can cooperate with the background frame 3 to perform fixed-point activation of visual detection to ensure the unity of the detection position. On the other hand, the situation of accidental touch activation of the visual camera 5 is basically avoided, reducing the interference of irrelevant image capture to improve the detection efficiency and accuracy.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 construed as a limitation of the present invention.

[0036] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "arrange", "connect", "install", "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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0037] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any person skilled in the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essence of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A circuit board inspection device, comprising a conveying rail and two visual cameras arranged above and below the conveying rail, characterized in that: A positioning fixture for positioning and clamping a circuit board is installed and conveyed along the conveying guide rail. Background frames cooperating with the vision cameras on the same side are oppositely installed at the upper and lower ends of the conveying guide rail. The positioning fixture passes through between the two background frames during the conveying process. A switch assembly is fixed on one side of the conveying guide rail. The switch assembly includes a switch frame fixed on the conveying guide rail. Two touch switches electrically connected to the two vision cameras one by one are fixed on the switch frame. A side shifting frame moving horizontally is assembled on the switch frame. Two vertical shifting frames moving synchronously with it are vertically and oppositely assembled on the side shifting frame. Touch pressure rods for touching the touch switches at corresponding positions are horizontally fixed on the two vertical shifting frames. When the positioning fixture moves, it passes through between the two vertical shifting frames. The positioning fixture jacks up the two vertical shifting frames up and down, and makes the side shifting frame move closer to the switch frame. When the side shifting frame is closest to the switch frame, the touch pressure rods correspondingly touch the touch switches, and the two vision cameras are turned on. When the positioning fixture is separated from the switch assembly, the side shifting frame and the vertical shifting frames automatically reset. The positioning fixture includes a fixture frame moving horizontally along the conveying guide rail and having a rectangular frame structure. The side shifting frame includes a U-shaped plate slidably installed horizontally 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 shifting frames are assembled on the U-shaped plate. A V-shaped block is fixed on the U-shaped plate. The outer V-shaped surface of the V-shaped block is arranged正对设置 with the sliding direction of the U-shaped plate. A touch pressure wheel is vertically rotatably installed on the fixture frame. When the positioning fixture moves along the conveying guide rail, the touch pressure wheel rolls and contacts the outer V-shaped surface of the V-shaped block. Two sliding plates are symmetrically fixed on the two outer side walls at the relative positions of the fixture frame. The fixture frame moves between the conveying guide rails through the two sliding plates. The vertical shifting frame includes a guide post slidably installed vertically on the U-shaped plate. One end of the guide post is fixed with a roller frame. The roller frame is located in the notch of the U-shaped plate. The touch pressure rod is horizontally fixed on the other end of the guide post, and the touch pressure rod is biased towards the switch frame. The roller frame is elastically connected to the U-shaped plate, and a roller is horizontally rotatably installed on the roller frame. When the sliding plate moves, it rolls and contacts the rollers on the two vertical shifting frames.

2. A circuit board detection device according to claim 1, characterized in that: A supporting frame for horizontally placing the circuit board is horizontally fixed inside the fixture frame. A clamping mechanism for clamping and positioning the circuit board is assembled on the supporting frame.

3. A circuit board detection device according to claim 2, characterized in that: The supporting frame is provided with a rectangular window. The clamping mechanism includes two first clamping strips slidably installed horizontally and oppositely on the supporting frame and two second clamping strips slidably installed horizontally and oppositely 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 clamp the circuit board synchronously are also assembled on the supporting frame.

4. A circuit board detection device according to claim 3, characterized in that: The driving assembly includes a plurality of shaft seats fixed on a supporting frame, on which bidirectional lead screws are horizontally rotatably mounted, and the two threaded sections of the bidirectional lead screws are threadedly connected to driving blocks; the No. 1 clamp is fixed between two driving blocks in relative positions in the two driving assemblies; connecting rods are hinged on the driving blocks; one of the No. 2 clamps is hinged on the two connecting rods in one driving assembly, and the other of the No. 2 clamps is hinged on the two connecting rods in the other driving assembly.

5. A circuit board detection device according to claim 1, characterized in that: A rectangular window is provided 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.

6. A circuit board detection device according to claim 3, characterized in that: The first clamping bar and the second clamping bar both have side clamping surfaces for laterally clamping the circuit board and downward pressing surfaces for pressing the circuit board downward.

7. A circuit board detection device according to claim 1, characterized in that: A touch pressure head which is in contact with the touch pressure switch is fixed at the end of the touch pressure rod.

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