CN113686896A

CN113686896A - PCB visual inspection equipment

Info

Publication number: CN113686896A
Application number: CN202110821587.2A
Authority: CN
Inventors: 周益和; 杨达利
Original assignee: Shenzhen Chonvo Intelligent Co ltd
Current assignee: Shenzhen Chonvo Intelligent Co ltd
Priority date: 2021-07-20
Filing date: 2021-07-20
Publication date: 2021-11-23
Anticipated expiration: 2041-07-20
Also published as: CN113686896B

Abstract

The application relates to the field of SMT processing and checking equipment, in particular to PCB visual detection equipment which comprises a frame body, a first track plate, a second track plate and a visual detection device; a channel for the PCB to pass through is reserved between the first track plate and the second track plate; the opposite plate surfaces of the first track plate and the second track plate are provided with transmission rails, and the transmission rails are used for transmitting the PCB to the detection position of the visual detection device; the opposite plate surfaces of the first track plate and the second track plate are respectively provided with an impurity inlet and a gas outlet which are oppositely arranged; the frame body is provided with an air bag; the gas bag is provided with an electromagnetic pulse valve for gas to flow out; an outlet pipe of the electromagnetic pulse valve is connected to the gas outlet. Gaseous passing through the electromagnetic pulse valve and flowing into the gas flow export in the gas package, gaseous guide through the gas flow export will be attached to the impurity of PCB face and insufflate in the impurity inlet, and this application has the effect that improves impurity influence PCB board and detect the precision problem.

Description

PCB visual inspection equipment

Technical Field

The application relates to the field of SMT processing and checking equipment, in particular to PCB visual detection equipment.

Background

SMT paster refers to the shorthand of a series of process flows processed on the basis of PCB. SMT is a surface mount technology (surface mount technology) and is one of the most popular techniques and technologies in the electronic assembly industry. After each process flow of the SMT chip is finished, the PCB is detected, so that errors of the pre-process can be found in advance, and loss is reduced.

Automatic optical inspection (AOI for short) is widely used in SMT patch technology. Automatic optical inspection during automated inspection, the machine passes through the camera automatic scanning PCB of horizontal migration, gathers the image, and the solder joint of test compares with the qualified parameter in the database, through image processing, inspects out the defect on the PCB to show the defect through the display, supply maintainer to repair.

In view of the above-mentioned related art, the inventor believes that when impurities are attached to the surface of the PCB in the pre-set process, the impurities tend to cover the detection points on the PCB, which causes the image obtained by the automatic optical inspection to be inconsistent with the image in the database, thereby reducing the detection accuracy.

Disclosure of Invention

In order to improve the problem that impurity influences PCB board and detects the precision, this application provides a PCB board visual detection equipment.

The application provides a PCB board visual detection equipment adopts following technical scheme:

a PCB visual inspection device comprises a frame body, a first track plate connected with the frame body, a second track plate connected with the frame body and a visual inspection device connected with the frame body; a channel for the PCB to pass through is reserved between the first track plate and the second track plate; the opposite plate surfaces of the first track plate and the second track plate are provided with conveying rails, and the conveying rails are used for conveying the PCB to the detection position of the visual detection device; the opposite plate surfaces of the first track plate and the second track plate are respectively provided with an impurity inlet and a gas outlet which are oppositely arranged; the impurity inlet is used for allowing impurities on the surface of the PCB to enter; the gas outflow port is used for blowing out gas attached to impurities on the surface of the PCB; the frame body is provided with an air bag; the gas bag is provided with an electromagnetic pulse valve for gas to flow out; an outlet pipe of the electromagnetic pulse valve is connected to the gas flow outlet.

Through adopting above-mentioned technical scheme, convey the PCB board to visual detection device's detection position in-process at the conveying rail, the electromagnetic pulse valve starts, gaseous in the gas bag flows into the gas flow export through the electromagnetic pulse valve, gaseous guide through the gas flow export, will adhere to in the impurity of PCB face blows and blows in the impurity inlet, thereby realize the effect of clean PCB face, the instantaneous of electromagnetic pulse valve is opened and close simultaneously, can blow the stubborn impurity of PCB face, improve gaseous clean effect to the PCB face, thereby reduce the risk that impurity covers the check point on the PCB board, and then improve the problem that impurity influences PCB board detection precision.

Optionally, the side wall of the gas outlet is rotatably connected with a plurality of air baffle plates arranged at intervals; the second track plate is provided with an electric push rod; a push rod of the electric push rod is connected with connecting rods fixed with the side walls of the plurality of wind disturbing plates; the electric push rod is used for pushing the connecting rod to move along the axial direction of the connecting rod.

Through adopting above-mentioned technical scheme, when the electromagnetic pulse valve starts, start electric putter, electric putter's push rod is at flexible in-process, drive the connecting rod along self axial displacement, the axial displacement of connecting rod drives the polylith and rotates the vortex board swing of connecting in the gas flow export, thereby make the gaseous change flow direction through the gas flow export, thereby realize the effect of the air current of equidirectional to the jetting of PCB board face, improve the problem that the components and parts of PCB board obstruct gaseous clean impurity, and then improve the clean effect through the gaseous clean PCB face of gas flow export.

Optionally, an air outlet pipe is arranged between the first track plate and the second track plate; two ends of the air outlet pipe are respectively and rotatably connected to the first track plate and the second track plate; a blowing pipe facing the surface of the first track plate is obliquely fixed on the side wall of the air outlet pipe; the blowing pipe is communicated with the inner cavity of the air outlet pipe; the air outlet pipe is communicated with the gas outlet.

Through adopting above-mentioned technical scheme, when the gaseous outflow that flows in the gas pocket, flow in the inner chamber of a tuber pipe, some is gaseous blows to impurity import through the gas outflow, and because the swing of wind disturbing plate, the part gas through the gas outflow will be followed not equidirectional jetting to impurity import, another part is gaseous blows to the face of first track board through the blowing pipe, the gas of these two parts forms the turbulent flow at the intersection of PCB face, thereby reduce the clean dead angle of gaseous clean PCB face, improve the effect of gaseous clean PCB face.

Optionally, the side wall of the air outlet pipe is fixedly connected with a light supplement lamp for supplementing light to the PCB surface.

Through adopting above-mentioned technical scheme, the setting of light filling, on the one hand, improves the luminance of PCB face, improves the dim image fuzzy problem that leads to the visual detection device to gather of PCB face, and on the other hand rotates out the tuber pipe, alright adjust the light filling angle of light filling lamp, makes the light filling lamp adapt to the light filling angle of the PCB board of different thickness.

Optionally, a movable block is fixedly connected to the peripheral side of the end portion of the air outlet pipe, and the movable block is located in the air outlet; the periphery of the connecting rod is obliquely and fixedly connected with a fixed rod, and the end part of the fixed rod, far away from the connecting rod, is fixedly connected with a dovetail block; the lateral wall of the movable block is provided with a dovetail groove for the dovetail block to slide and connect along the radial direction of the air outlet pipe.

Through adopting above-mentioned technical scheme, when electric putter's push rod is flexible, self axial displacement is followed to the connecting rod, the dead lever removes along the removal of connecting rod, at the in-process that the dead lever removed, the dovetail piece slides along the length direction of dovetail, through the cooperation of dovetail and dovetail piece, at electric putter's the flexible in-process of push rod, realize that the dead lever promotes the effect of movable block swing back and forth, thereby realize out tuber pipe swing back and forth's effect, make the gas that the blowing pipe blew off, can realize the effect of clean PCB face different positions, reduce the clean dead angle of the clean PCB face of gas.

Optionally, the end part of the air outlet pipe located in the air outlet is fixedly connected with a heating wire of an external power supply.

Through adopting above-mentioned technical scheme, the heater heating gets into the intraductal gas of air-out to the gas that the heating blowing pipe flows out, with the moisture fast drying of PCB face, reduce the risk that the PCB face is corroded by the water, improve PCB's life.

Optionally, the frame body is provided with a vacuum pump, and an air suction port pipeline of the vacuum pump is connected to the impurity inlet; the surface of the first track plate, which is far away from the second track plate, is provided with a sliding hole, and the sliding hole extends along the length direction of the conveying track; the sliding hole is communicated with the impurity inlet; the inner wall of the impurity inlet is provided with a scraper blade for scraping impurities adhered to the inner wall of the impurity inlet; and a displacement rod which is slidably arranged in the sliding hole is fixed on the side wall of the scraper.

Through adopting above-mentioned technical scheme, when the electromagnetic pulse valve starts, open the vacuum pump, because vacuum pump and impurity inlet pipe connection, impurity import department will produce the negative pressure, the impurity that is located impurity import department will be inhaled to the vacuum pump, it remains to reduce the impurity that the PCB board is located impurity import department, the setting of scraper blade simultaneously, through the cooperation in displacement pole and the hole that slides, be convenient for follow-up will remain in the impurity of impurity import inner wall and strike off, the gas that reduces the air current flow export blows the impurity in the impurity import again to PCB's risk.

Optionally, the first track plate is provided with two organ shields for covering the sliding holes; the two organ protective covers are respectively and symmetrically arranged along the axis of the displacement rod; one end of the organ protective cover is fixedly connected to the peripheral side of the displacement rod, and the other end of the organ protective cover is fixedly connected to the side wall of the sliding hole.

Through adopting above-mentioned technical scheme, the design of organ protection casing reduces impurity and drops out the outer risk of impurity import through the hole that slides, reduces the risk that impurity blocks up in the hole that slides when the scraper blade strikes off impurity simultaneously.

Optionally, a sealing cover is detachably connected to the surface of the first track plate, which is away from the second track plate; the sealing cover is used for covering the sliding hole; when the sealing cover is connected with the first track plate, the end part of the displacement rod, which is far away from the scraper, is positioned in the inner cavity of the sealing cover.

Through adopting above-mentioned technical scheme, reduce the risk that the external gas that first track board deviates from second track board face department flows into in the impurity import to reduce the risk that the suction of impurity import department is not enough when the vacuum pump opens.

Optionally, a first magnetic strip ring is fixedly connected to an opening of the sealing cover; the surface of the first track plate, which is far away from the second track plate, is fixedly connected with a second magnetic strip ring; the sliding hole is positioned in the second magnetic strip ring; the first magnetic strip ring and the second magnetic strip ring are attracted.

Through adopting above-mentioned technical scheme, be convenient for the sealed cowling dismouting in first track board face when, improve the sealing performance of sealed cowling and first track board.

In summary, the present application includes at least one of the following beneficial technical effects:

1. gas in the gas bag flows into the gas outlet through the electromagnetic pulse valve, the gas is guided by the gas outlet to blow impurities attached to the PCB surface and blow the impurities into the impurity inlet, so that the PCB surface cleaning effect is realized, meanwhile, the electromagnetic pulse valve is instantly opened and closed to blow stubborn impurities on the PCB surface, the cleaning effect of the gas on the PCB surface is improved, the risk that the detection points on the PCB are covered by the impurities is reduced, and the problem that the detection precision of the PCB is influenced by the impurities is solved;

2. the connecting rod is driven by the electric push rod to move along the axial direction of the connecting rod, and the air disturbing plates which are rotationally connected to the air outlet are driven to swing, so that the air passing through the air outlet changes the flowing direction, the effect of blowing air flows in different directions to the surface of the PCB is realized, the problem that components of the PCB block air to clean impurities is solved, and the cleaning effect of the air passing through the air outlet on the surface of the PCB is improved;

3. through blowing pipe and gas outflow, divide into two parts gas with the gas in the gas package and blow to the PCB face, because the swing of disturbing the aerofoil, the part gas through gas outflow will follow equidirectional impurity import jetting, and the gas of these two parts intersects at the PCB face and forms the turbulent flow to reduce the clean dead angle of gaseous clean PCB face, improve the effect of gaseous clean PCB face.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present application.

Fig. 2 is a schematic structural diagram for showing a cleaning device according to an embodiment of the present application.

Fig. 3 is an enlarged view of a portion a of fig. 1.

Fig. 4 is a schematic structural diagram for illustrating a second track plate according to an embodiment of the present application.

Fig. 5 is an enlarged view of fig. 4 at a portion B.

Fig. 6 is an enlarged view of fig. 2 at the portion C.

Fig. 7 is a schematic diagram for illustrating a positional relationship between the seal cover and the first track plate according to an embodiment of the present disclosure.

Description of reference numerals: 1. a frame body; 2. a first track plate; 21. an impurity inlet; 22. a sliding hole; 23. an organ shield; 24. a second magnetic strip coil; 3. a second track plate; 31. a gas flow outlet; 32. a wind disturbing plate; 33. a mounting cavity; 34. an electric push rod; 35. a connecting rod; 351. fixing the rod; 352. a dovetail block; 4. a visual inspection device; 41. an XY axis moving platform; 42. a camera; 5. a transfer rail; 51. a feed inlet; 52. a discharge port; 53. a rubber conveyor belt; 54. a guide wheel; 55. a drive motor; 6. air bags; 61. an electromagnetic pulse valve; 7. a vacuum pump; 71. an impurity barrel; 711. an impurity inlet; 712. a breathable bag; 8. an air outlet pipe; 81. a light supplement lamp; 82. a blowpipe; 83. a heater; 84. a movable block; 841. a dovetail groove; 9. a squeegee; 91. a displacement rod; 10. a sealing cover; 101. a first magnetic strip coil.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

The embodiment of the application discloses PCB board visual detection equipment. Referring to fig. 1, a PCB panel visual inspection apparatus includes a frame body 1, a first track plate 2, a second track plate 3, a visual inspection device 4 and a cleaning device, wherein the first track plate 2 and the second track plate 3 are all bolted to the frame body 1, the first track plate 2 and the second track plate 3 are arranged relatively, and a channel for the PCB panel to pass through is reserved between the first track plate 2 and the second track plate 3. The opposite surfaces of the first track plate 2 and the second track plate 3 are provided with a conveying rail 5, the conveying rail 5 is provided with a feeding hole 51 and a discharging hole 52, and the conveying rail 5 is used for conveying the PCB to a detection position of the visual detection device 4. Before the conveying rail 5 conveys the PCB to the detection position of the visual detection device 4, the cleaning device cleans the surface of the PCB, and the risk that the detection points on the PCB are covered by impurities is reduced.

Referring to fig. 1, specifically, conveying rail 5 includes rubber conveyor belt 53, guide pulley 54 and driving motor 55, the area face of rubber conveyor belt 53 supplies the butt of PCB board, the face of first track board 2 and second track board 3 all rotates and is connected with two or more guide pulleys 54, two or more guide pulleys 54 extend the setting along the direction of delivery of conveying rail 5, rubber conveyor belt 53 is around locating two or more sides of guide pulley 54, the equal bolted connection of face that first track board 2 and second track board 3 deviate from mutually has driving motor 55, the face of first track board 2 and second track board 3 is passed in the pivot of driving motor 55, guide pulley 54 is fixed in driving motor 55's pivot coaxially.

Referring to fig. 1, the vision inspection device 4 includes an XY axis moving platform 41 bolted to the frame body 1 and a camera 42 bolted to the XY axis moving platform 41, the XY axis moving platform 41 drives the camera 42 to move horizontally, the camera 42 is located above the conveying rail 5, and the camera 42 is used for collecting an image of the PCB. It should be noted that the camera 42 is located between the inlet 51 and the outlet 52, i.e. at the detection position of the visual detection device 4.

Referring to fig. 1 and 2, the opposite surfaces of the first track plate 2 and the second track plate 3 are respectively provided with an impurity inlet 21 and a gas outlet 31 which are arranged oppositely, the impurity inlet 21 is used for allowing impurities on the surface of the PCB to enter, and the gas outlet 31 is used for blowing gas attached to the impurities on the surface of the PCB to flow out. The impurity inlet 21 and the gas outlet 31 are both provided extending in the conveying direction of the conveying rail 5.

Referring to fig. 1 and 2, the cleaning apparatus includes an air bag 6 bolted to a frame body 1 and a vacuum pump 7 bolted to the frame body 1, the air bag 6 is hermetically connected with an electromagnetic pulse valve 61 for passing gas, and an outlet pipe of the electromagnetic pulse valve 61 is connected to a gas outlet 31. An air suction pipeline of the vacuum pump 7 is connected with an impurity barrel 71, an impurity inlet 711 is formed in the side wall of the impurity barrel 71 in a penetrating mode, a ventilation bag 712 connected to the impurity inlet 711 in a sealing mode is arranged in the inner cavity of the impurity barrel 71, and the impurity inlet 711 is connected to the impurity inlet 21 through a pipeline. The electromagnetic pulse valve 61 and the vacuum pump 7 are started, compressed air in the air bag 6 intermittently flows out of the gas outlet 31, and the impurities on the PCB surface are blown to the impurity inlet 21 by the gas guided by the gas outlet 31, and negative pressure is generated at the impurity inlet 21 after the vacuum pump 7 is started due to the arrangement of the vacuum pump 7 and the impurity barrel 71, so that the impurities at the impurity inlet 21 are sucked into the ventilation bag 712, and the cleaning operation of the PCB surface can be completed.

Referring to fig. 3 and 4, in the present embodiment, in order to improve the problem that the components of the PCB block the gas from cleaning impurities, a plurality of baffle plates 32 are rotatably connected to the side wall of the gas outlet 31, and the baffle plates 32 are perpendicular to the conveying direction of the conveying rail 5. The installation cavity 33 that communicates with gas flow outlet 31 is seted up to second track board 3's inside, bolt connection has electric putter 34 in installation cavity 33, electric putter 34's push rod coupling joint has connecting rod 35, connecting rod 35 and polylith air disturbing plate 32's lateral wall welded fastening, when electric putter 34 starts, electric putter 34's push rod is flexible, drive connecting rod 35 along self axial displacement, connecting rod 35's axial displacement drives polylith air disturbing plate 32 swing back and forth, thereby make the gaseous change flow direction through gas flow outlet 31, thereby realize the effect of the air current of equidirectional to the jetting of PCB board plane, improve the problem that the components and parts of PCB board hinder gaseous clean impurity.

Referring to fig. 3 and 4, an air outlet pipe 8 is arranged between the first track plate 2 and the second track plate 3, a light supplement lamp 81 is fixedly connected to the outer wall of the air outlet pipe 8, and the light supplement lamp 81 is used for supplementing light to the surface of the PCB to improve the problem of image blurring collected by the camera 42. Two ends of the air outlet pipe 8 are respectively connected to the opposite plate surfaces of the first track plate 2 and the second track plate 3 in a rotating manner. Wherein one end of the air outlet pipe 8 is communicated with the gas outlet 31. The lateral wall of the air outlet pipe 8 is welded with the blowpipe 82 in an inclined manner, the blowpipe 82 is communicated with the inner cavity of the air outlet pipe 8, the air outlet of the blowpipe 82 faces the board surface of the first track board 2, and the blowpipe 82 is used for guiding the gas in the air outlet pipe 8 to the PCB board surface.

Referring to fig. 5, be provided with external power supply in the port of air-out pipe 8 and gas outflow 31 intercommunication and stretch into the heater 83 in the air-out pipe 8, the purpose of design heater 83 is that the heating gets into the gas in the air-out pipe 8 to the gas that heating blowing pipe 82 flowed out dries the moisture of PCB face fast, reduces the risk that the PCB face was corroded by water.

Referring to fig. 4 and 5, a portion of the circumferential side of the end portion of the outlet duct 8 communicating with the gas outlet 31 is located inside the gas outlet 31, and a movable block 84 is welded to the circumferential side of the outlet duct 8 located inside the gas outlet 31. The lateral wall slope welding of connecting rod 35 has dead lever 351, the tip welding that connecting rod 35 was kept away from to dead lever 351 has dovetail block 352, dovetail 841 that supplies dovetail block 352 to slide and connect is offered towards dovetail block 352's surface, borrow this design, at connecting rod 35 axial displacement in-process, dovetail block 352 slides along the length direction of dovetail 841, cooperation through dovetail 841 and dovetail block 352, at the flexible in-process of electric putter's 34 push rod, realize that dead lever 351 promotes movable block 84 swing back and forth's effect, thereby realize out the effect of tuber pipe 8 swing back and forth, the effect of clean PCB face different positions can be realized to the gas that makes blowpipe 82 blow off.

Referring to fig. 2 and 6, in this embodiment, in order to reduce the risk that the impurities are attached to the inner wall of the impurity inlet 21, the plate surface of the first track plate 2 departing from the second track plate 3 is provided with a sliding hole 22, the sliding hole 22 extends along the conveying direction of the conveying rail 5, and the sliding hole 22 is communicated with the impurity inlet 21. The inner wall of the impurity inlet 21 is provided with a scraper 9 abutting against the inner wall of the impurity inlet 21, and the scraper 9 is used for scraping impurities adhered to the inner wall of the impurity inlet 21.

Referring to fig. 6 and 7, a displacement rod 91 slidably inserted into the sliding hole 22 is welded to the side wall of the scraper 9, two organ shields 23 for covering the sliding hole 22 are disposed on the first track plate 2, and the two organ shields 23 are symmetrically disposed on the axis of the displacement rod 91. One end of the organ guard 23 is bonded to the peripheral side of the displacement rod 91, and the other end is bonded to the side wall of the slide hole 22. The organ shield 23 is designed to reduce the risk of impurities falling out of the impurity inlet 21 through the slide hole 22.

Referring to fig. 6 and 7, a sealing cover 10 is disposed on a surface of the first track plate 2 away from the second track plate 3, a first magnetic strip ring 101 is bonded to an opening of the sealing cover 10, and the first magnetic strip ring 101 is made of a rubber magnetic strip. The surface of the first track plate 2 departing from the second track plate 3 is fixedly connected with a second magnetic strip ring 24, the second magnetic strip ring 24 is also made of rubber magnetic strips, the sliding hole 22 is positioned in the second magnetic strip ring 24, and the first magnetic strip ring 101 and the second magnetic strip ring 24 are mutually attracted. When the first magnetic strip ring 101 and the second magnetic strip ring 24 are mutually attracted, the end part of the displacement rod 91 far away from the scraper 9 is positioned in the inner cavity of the sealing cover 10, so that the risk that the outside air at the position of the first track plate 2 far away from the plate surface of the second track plate 3 flows into the impurity inlet 21 is reduced, and the risk that the negative pressure attraction force at the position of the impurity inlet 21 is insufficient is reduced.

The implementation principle of the PCB visual inspection equipment in the embodiment of the application is as follows: in the process that the conveying rail 5 conveys the PCB from the feeding hole 51 to the detection position of the visual detection device 4, the electromagnetic pulse valve 61 and the vacuum pump 7 are started, the heating wire 83 is externally connected with a power supply, compressed air in the air bag 6 intermittently supplies air to the air outlet 31 through the electromagnetic pulse valve 61, one part of air is blown to the impurity inlet 21 through the air outlet 31, the other part of air is blown to the surface of the first track plate 2 through the blowing pipe 82, the impurities on the surface of the PCB are blown into the impurity inlet 21 by the air, and the impurities fall into the ventilation bag 712, so that the cleaning operation of the surface of the PCB can be completed.

When need not to carry out the benefit to the PCB board, start electric putter 34, the cooperation of electric putter 34 and connecting rod 35 realizes polylith air disturbing plate 32 wobbling effect, go out 8 wobbling effects of tuber pipe, make gaseous from equidirectional to PCB face jetting, the blowing pipe 82 blows the gas that flows out to the gas and the gas outflow mouth 31 of first track board 2 faces, form the turbulent flow in PCB face intersection, reduce the clean dead angle of gaseous clean PCB face, improve the effect of gaseous clean PCB face.

When needing to mend the light to the PCB board, electric putter 34 is in the off-state, starts light filling lamp 81, and light filling lamp 81 improves the blurred problem of image that camera 42 gathered to PCB face light filling, and when needs adjustment light filling angle, can start electric putter 34 and close after the settlement time, goes out the rotation of tuber pipe 8, drives the light filling lamp 81 that is located 8 week sides of tuber pipe to rotate to realize the regulation of light filling angle.

After the production operation is finished, an operator can separate the sealing cover 10 from the first track plate 2, hold the displacement rod 91 and slide back and forth along the length direction of the sliding hole 22, and the scraper 9 can scrape impurities attached to the inner wall of the impurity inlet 21, so that the cleanliness of the impurity inlet 21 is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a PCB board visual detection equipment which characterized in that: the device comprises a frame body (1), a first track plate (2) connected with the frame body (1), a second track plate (3) connected with the frame body (1) and a visual detection device (4) connected with the frame body (1); a channel for a PCB to pass through is reserved between the first track plate (2) and the second track plate (3); the opposite plate surfaces of the first track plate (2) and the second track plate (3) are respectively provided with a conveying rail (5), and the conveying rails (5) are used for conveying the PCB to the detection position of the visual detection device (4); the opposite plate surfaces of the first track plate (2) and the second track plate (3) are respectively provided with an impurity inlet (21) and a gas outlet (31) which are oppositely arranged; the impurity inlet (21) is used for allowing impurities on the surface of the PCB to enter; the gas outlet (31) is used for blowing out gas attached to impurities on the surface of the PCB; the frame body (1) is provided with an air bag (6); the air bag (6) is provided with an electromagnetic pulse valve (61) for air to flow out; an outlet conduit of the electromagnetic pulse valve (61) is connected to the gas outlet port (31).

2. The visual inspection device of a PCB board of claim 1, wherein: the side wall of the gas outlet (31) is rotatably connected with a plurality of wind disturbing plates (32) which are arranged at intervals; the second track plate (3) is provided with an electric push rod (34); the push rod of the electric push rod (34) is connected with a connecting rod (35) fixed with the side walls of the wind disturbing plates (32); the electric push rod (34) is used for pushing the connecting rod (35) to move along the axial direction of the connecting rod.

3. The visual inspection device of a PCB board of claim 2, wherein: an air outlet pipe (8) is arranged between the first track plate (2) and the second track plate (3); two ends of the air outlet pipe (8) are respectively and rotatably connected to the first track plate (2) and the second track plate (3); a blowing pipe (82) facing the surface of the first track plate (2) is obliquely fixed on the side wall of the air outlet pipe (8); the air blowing pipe (82) is communicated with the inner cavity of the air outlet pipe (8); the air outlet pipe (8) is communicated with the gas outlet (31).

4. The visual inspection device of a PCB board of claim 3, wherein: and the side wall of the air outlet pipe (8) is fixedly connected with a light supplement lamp (81) for supplementing light to the PCB surface.

5. The visual inspection device of a PCB board of claim 3, wherein: the periphery of the end part of the air outlet pipe (8) is fixedly connected with a movable block (84), and the movable block (84) is positioned in the gas outlet (31); a fixed rod (351) is fixedly connected to the peripheral side of the connecting rod (35) in an inclined mode, and a dovetail block (352) is fixedly connected to the end portion, far away from the connecting rod (35), of the fixed rod (351); the side wall of the movable block (84) is provided with a dovetail groove (841) for the dovetail block (352) to slide and connect along the radial direction of the air outlet pipe (8).

6. The visual inspection device of a PCB board of claim 3, wherein: the end part of the air outlet pipe (8) positioned in the gas outlet (31) is fixedly connected with a heating wire (83) of an external power supply.

7. The visual inspection device of a PCB board of claim 1, wherein: the frame body (1) is provided with a vacuum pump (7), and an air suction port pipeline of the vacuum pump (7) is connected to the impurity inlet (21); the surface of the first track plate (2) departing from the second track plate (3) is provided with a sliding hole (22), and the sliding hole (22) extends along the length direction of the conveying track (5); the sliding hole (22) is communicated with the impurity inlet (21); the inner wall of the impurity inlet (21) is provided with a scraper (9) used for scraping impurities adhered to the inner wall of the impurity inlet (21); and a displacement rod (91) which is slidably arranged in the sliding hole (22) is fixed on the side wall of the scraper (9).

8. The visual inspection device of a PCB board of claim 7, wherein: the first track plate (2) is provided with two organ protective covers (23) for covering the sliding holes (22); the two organ protection covers (23) are respectively and symmetrically arranged along the axis of the displacement rod (91); one end of the organ protection cover (23) is fixedly connected to the peripheral side of the displacement rod (91), and the other end of the organ protection cover is fixedly connected to the side wall of the sliding hole (22).

9. The visual inspection device of a PCB board of claim 7, wherein: the surface of the first track plate (2) departing from the second track plate (3) is detachably connected with a sealing cover (10); the sealing cover (10) is used for covering the sliding hole (22); when the sealing cover (10) is connected with the first track plate (2), the end part of the displacement rod (91) far away from the scraper (9) is positioned in the inner cavity of the sealing cover (10).

10. The visual inspection device of a PCB board of claim 9, wherein: a first magnetic strip ring (101) is fixedly connected to an opening of the sealing cover (10); the surface of the first track plate (2) departing from the second track plate (3) is fixedly connected with a second magnetic strip ring (24); the sliding hole (22) is positioned in the second magnetic strip coil (24); the first magnetic strip ring (101) and the second magnetic strip ring (24) are attracted.