CN113820273A

CN113820273A - Detection system for PCB (printed circuit board)

Info

Publication number: CN113820273A
Application number: CN202110950374.XA
Authority: CN
Inventors: 陈泽贤; 李泽旭
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2021-12-21

Abstract

The invention belongs to the technical field of PCB detection: in particular to a detection system of a PCB printed circuit board. The invention relates to a detection system of a PCB (printed Circuit Board), which comprises a base frame, a material platform, a material moving mechanism, a conveyor belt, a detector and a controller, wherein the base frame is provided with a plurality of material conveying grooves; with the development of the PCB typesetting process, if the manual feeding and discharging and plate turning mode is still adopted to supply materials for the detection equipment, workers can be quickly exhausted and are difficult to keep up with the working time of the detection equipment; the automatic feeding and discharging and plate turning device utilizes the arranged conveying belt and the material moving mechanism, and the controller controls the devices to automatically feed and discharge materials and turn the plate on the PCB printed circuit board, so that the steps of manual feeding and discharging and plate turning in the conventional PCB printed circuit board detection system are replaced, the PCB printed circuit board is conveniently detected, the working beat is kept stable, and the operation effect of the PCB printed circuit board detection system is improved.

Description

Detection system for PCB (printed circuit board)

Technical Field

The invention belongs to the technical field of PCB detection: in particular to a detection system of a PCB printed circuit board.

Background

A Printed Circuit Board (PCB) is an indispensable basic electronic component in all electronic products. In the production process, the quality of the circuit generated by the processed and etched copper-clad plate must be detected. At present, the main detection mode is to adopt manual feeding and discharging and utilize a special automatic optical detection instrument to detect the PCB. Regarding the main feeding and discharging and turning plate mode of the PCB detection system in the prior art, the following can be found: the application research of PCB defect detection charging and discharging systems of Jian dragon, Lin, Chenjiaxiong, and the like [ J ] electromechanical engineering technology, 2018,47(008):97-100,252. along with the development of typesetting technology, automatic optical detection equipment is not limited to single-layer inner-layer copper-clad plate detection any more, and also comprises the detection of finished PCB printed circuit boards formed by laminating multiple layers of copper-clad plates, wherein the number of layers can reach 128 layers at most, and the quality can reach 15kg at most. If still adopt the manual work to go up the unloading and then turn over the mode of board for check out test set feed this moment, the workman can be tired out soon, is difficult to keep up check out test set's beat, has seriously influenced the productivity. The multi-axis manipulator adopted by the automatic detection equipment in the prior art is high in use cost, and the integration degree of the detection process of the automatic plate turnover machine on the PCB is insufficient.

For example, a chinese patent with application number CN201310303303.6 provides a batch defect detecting system for PCB boards, comprising: the thermal infrared imager is used for collecting the infrared radiation energy of the PCB to be detected and outputting a corresponding infrared image; a black body to provide a reference for target temperature measurement; a detection platform; a pressure sensor; an image format conversion module; the power supply and control module is used for providing an excitation signal of the PCB to be detected and controlling the thermal infrared imager to work; the counting and timing module is used for counting and numbering the detected PCB and recording the duration time of an excitation signal of the detected PCB; according to the technical scheme, the infrared image and the temperature information of the detected PCB are analyzed and processed through the analysis platform in the power-on state, the fault information of the detected PCB is obtained, and a statistical report is generated. However, the problem of automatic feeding and discharging and automatic plate turning of the PCB is not completely solved, and the problem of manual placement of the PCB for detection is not solved by the technical scheme.

In view of the above, in order to solve the above problems, the present invention provides a detection system for a PCB, which solves the above technical problems.

Disclosure of Invention

In order to make up for the defects of the prior art, the invention provides the detection system of the PCB, and the detection system of the PCB replaces the steps of manual feeding and discharging and plate turning in the existing detection system of the PCB by the cooperation of the material moving mechanism and the conveyor belt, so that the unstable factors are reduced, and the efficiency of the detection system of the PCB is improved.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a detection system of a PCB (printed Circuit Board), which comprises a base frame, a material platform, a conveyor belt, a detector and a controller, wherein the base frame is provided with a plurality of detection holes; a material table is arranged in the base table, and the top of the material table is fixedly connected with a detection table; a detector is arranged above the detection table and is slidably mounted on the base frame; a fixed conveying belt is arranged in the base frame, and the upper surface of the conveying belt is flush with the upper surface of the material table; the material moving mechanism is further arranged in the base frame and comprises a rotary table, the rotary table is rotatably mounted at the top end of the material table, a screw rod and a slide rod are arranged on the rotary table, a slide block is in threaded transmission connection with the screw rod, the slide block is in sliding connection with the slide rod, an electric telescopic rod is fixedly connected to the side edge of the slide block, the tail end of the electric telescopic rod is rotatably connected with a connecting rod, and a driving rotor is arranged at the connection position of the connecting rod and the electric telescopic rod; the bottom of the connecting rod is fixedly connected with a sucker; the controller controls the operation of the system;

the quality of a circuit generated by a processed and etched copper-clad plate must be detected in the production process of the printed circuit board, the main detection mode at present adopts manual feeding and discharging, a special detector is used for detecting the printed circuit board, along with the development of a typesetting process, a detection object is not limited to the detection of a single-layer inner-layer copper-clad plate any more, the detection of a finished product PCB formed by laminating multiple layers of copper-clad plates is also included, the number of layers can reach 128 at most, the quality can reach 15kg, and at the moment, if the manual feeding and discharging and plate turning mode is still adopted for supplying materials to detection equipment, workers can quickly fatigue and are difficult to follow the working cycle of the detection equipment;

therefore, the controller is started, and the controller is used for controlling the transportation of the conveyor belt, the rotation of the turntable, the sliding of the straightening frame, the sliding and up-down movement of the detector and the expansion and contraction of the electric telescopic rod; directly placing a PCB to be detected on a conveyor belt, conveying the PCB to a position close to a detection table by the conveyor belt, extending an electric telescopic rod, rotating a turntable to transfer a sucker above the PCB, sliding a slider downwards, adsorbing the PCB, sliding the slider upwards and rotating the turntable, moving the PCB to the position above the detection table, sliding downwards, placing the PCB on the detection table, loosening the sucker, after placement, moving the slider upwards, shortening the electric telescopic rod, rotating the turntable, moving the sucker away from the PCB, moving a detector slidably mounted on the top of a base frame to the position right above the PCB, carrying out photographing detection, moving the detector back to the original position, controlling the slider to move downwards, extending the electric telescopic rod, rotating the turntable, moving the sucker to the PCB, sucking one side of the PCB, the driving rotor at the joint of the electric telescopic rod and the connecting rod drives the connecting rod to turn upwards, the PCB is turned, the slider is controlled to move downwards immediately, the PCB is placed on the detection table, the sucker is loosened immediately, the electric telescopic rod is contracted, the driving rotor drives the connecting rod to rotate downwards, the slider moves upwards, the sucker is removed, the detector is moved to the position above the PCB, the back side of the PCB is photographed and detected, and after the front side and the back side of the PCB are detected, the sucker is controlled to move to the position above the PCB, and the sucker is adsorbed to the conveyor belt to be conveyed away; according to the invention, the cooperation of the arranged conveying belt, the screw pair, the sliding block, the electric telescopic frame, the connecting rod and the sucker is utilized to replace manual feeding and discharging, so that the PCB is conveniently detected, the working beat is kept stable, and the operation effect of the detection system of the PCB is improved.

Preferably, the top of the material table is fixedly connected with a fixing frame; the fixed frame is provided with a slide rail; the utility model discloses a PCB printed circuit board, including slide rail, swing frame, mount, power drive device, electric putter, and electric putter, PCB, and electric putter, wherein the electric putter, and electric putter, wherein the PCB, and electric putter are used for the electric putter, and printed circuit board, and the PCB, and the electric putter are arranged on the printed circuit board, and the printed circuit board are arranged on the printed circuit board, and the printed wiring board, and the printed circuit board, and the printed wiring board, and the board are arranged on the printed wiring board, and the printed wiring board are arranged on the board, and the board are arranged on the board are.

Preferably, the surface of the straightening frame and the surface of the L-shaped block facing the center of the detection table are adhered with a cushion pad, and the surface of the cushion pad is covered with a fixedly connected aluminum foil; the blotter can prevent to put up and when L-shaped piece simultaneous operation in the pendulum, plays the effect of buffering when the edge of PCB printed circuit board and the contact surface contact of putting up and L-shaped piece in the pendulum, prevents to cause the injury to the edge of PCB printed circuit board, and the tinfoil piece that links firmly on the blotter can also avoid removing the friction between PCB printed circuit board in-process and blotter and produce static, prevents to cause electrostatic damage to the components and parts on the PCB printed circuit board.

Preferably, the conical surface of the sucker is provided with an annular corrugated section, the edge of the port of the sucker is provided with a pressing sheet which is fixedly connected, the strength of the pressing sheet is lower than that of a welding leg of a component, and the pressing sheet drives the edge of the sucker to generate deformation deflection when stressed; when the sucker contacts the surface of the PCB (printed circuit board) along with the lifting of the rotating body and generates adsorption, the sucker is extruded by the sucker to deflect by the sucker when contacting the PCB and gradually pushes down the sucker, the presser plate contacting the raised component on the PCB continues to slide by matching with the corrugated section on the conical surface of the sucker, and the corrugated section is used as the allowance for deformation of the part of the presser plate contacting the PCB and the surface component, so that the acting force of the end presser plate of the sucker on the PCB is limited in a safe range, the damage of the presser plate on the component on the PCB is avoided, the presser plate drives the sucker to deflect towards the inner side or the outer side of the component according to the position relation between the position contacting the raised component and the sucker, the component is separated or wrapped, and finally the tail end of the sucker completely contacts the surface of the PCB along with the presser plate, and then the sucking disc is adsorbed on the PCB so as to stabilize the operation process of the detection system of the PCB.

Preferably, the tail end of the pressing sheet is provided with a round angle; in PCB printed circuit board's testing process, through setting up the fillet at the preforming end, make the preforming when receiving the sucking disc effect to press to PCB printed circuit board surface, utilize the fillet end to be convenient for the preforming and produce on PCB printed circuit board surface and slide, avoid PCB printed circuit board to cause the fish tail to play the effect of protection to PCB printed circuit board.

Preferably, examine test table top and place the diaphragm, when the sucking disc adsorbs PCB printed circuit board's hole site, the sucking disc adsorbs the diaphragm of below through PCB printed circuit board's hole site, plug up PCB printed circuit board's hole site and reach the effect of adsorbing PCB printed circuit board, when the diaphragm is adsorbed by the sucking disc with PCB printed circuit board simultaneously, it is rotatory through the connecting rod, by the adsorbed PCB printed circuit board turn-over, place it back on putting and examining the test table, adsorb the diaphragm at PCB printed circuit board back again and remove to the material bench, so that the detector detects PCB printed circuit board's the back, thereby PCB printed circuit board's detecting system's operational effect has been stabilized.

The invention has the following beneficial effects:

1. through setting up material moving mechanism and conveyer belt mating reaction, replaced the artifical step of going up unloading and turning over the board in the detecting system of current PCB printed circuit board, reduced the unstable factor, increased PCB printed circuit board's detecting system's efficiency.

2. Through setting up the centering frame and L-shaped piece, can effectual centering PCB printed circuit board's position, what the detector of being convenient for was accurate detects PCB printed circuit board.

3. Through setting up the preforming at the sucking disc end, make its extrusion that receives the sucking disc when contacting PCB printed circuit board produce the deflection, and along with the gradual holding down of sucking disc, can make the preforming that contacts protruding components and parts position on the PCB printed circuit board continue to produce and slide, cooperate the ripple section on the sucking disc conical surface, make the preforming according to the position and the sucking disc position relation between the protruding components and parts of contacting, make the preforming drive the inboard or the outside skew of sucking disc to components and parts, separate components and parts or wrap up, make the sucking disc end contact PCB printed circuit board surface along with the preforming completely at last, and then realize the absorption of sucking disc on PCB printed circuit board, thereby the operation process of PCB printed circuit board's detecting system has been stabilized.

Drawings

The invention is further described with reference to the following figures and embodiments.

FIG. 1 is a perspective view of the overall structure of the present invention;

FIG. 2 is a perspective view of the inspection station and transport apparatus of the present invention;

FIG. 3 is a cross-sectional view of the suction cup and wafer of the present invention;

in the figure: 1. a base frame; 2. a material platform; 11. a conveyor belt; 12. a detector; 21. a detection table; 211. a membrane; 212. an L-shaped block; 22. a turntable; 221. a screw rod; 222. a slide bar; 223. a slider; 224. an electric telescopic rod; 225. a connecting rod; 226. a suction cup; 227. tabletting; 23. a fixed mount; 231. a frame is arranged; 232. a cushion pad.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 3, the detection system for PCB according to the present invention includes a base frame 1, a material table 2, a conveyor belt 11, a detector 12 and a controller; a material table 2 is arranged in the base table, and the top of the material table 2 is fixedly connected with a detection table 21; a detector 12 is arranged above the detection table 21, and the detector 12 is slidably mounted on the base frame 1; a fixed conveyor belt 11 is arranged in the base frame 1, and the upper surface of the conveyor belt 11 is flush with the upper surface of the material platform 2; the material moving mechanism is further arranged in the base frame and comprises a rotary table 22, the rotary table 22 is rotatably mounted at the top end of the material table 2, a screw rod 221 and a sliding rod 222 are arranged on the rotary table 22, a sliding block 223 is in threaded transmission connection with the screw rod 221, the sliding block 223 is in sliding connection with the sliding rod 222, the side edge of the sliding block 223 is fixedly connected with an electric telescopic rod 224, the tail end of the electric telescopic rod 224 is rotatably connected with a connecting rod 225, and a driving rotor is arranged at the connection position of the connecting rod 225 and the electric telescopic rod 224; the bottom of the connecting rod 225 is fixedly connected with a sucker 226; the controller controls the operation of a detection system of the PCB;

in the production process of the printed circuit board, the quality of a circuit generated by a processed and etched copper-clad plate must be detected, the main detection mode at present is to adopt manual feeding and discharging, a special detector 12 is used for detecting the printed circuit board, along with the development of a typesetting process, a detection object is not limited to the detection of a single-layer inner-layer copper-clad plate any more, the detection of a finished product PCB formed by laminating multiple layers of copper-clad plates is also included, the number of layers can reach 128 at most, the quality can reach 15kg, and at the moment, if the manual feeding and discharging and plate turning mode is still adopted for supplying materials to detection equipment, workers can quickly fatigue and are difficult to keep up with the working beat of the detection equipment;

therefore, the invention directly places the PCB to be detected on the conveyor belt 11 by starting the controller, and is transported to a position close to the detection table 21 by the conveyor belt 11, the electric telescopic rod 224 extends, the turntable 22 rotates to transfer the sucker 226 to the upper part of the PCB, the slide block 223 slides downwards, after the PCB is absorbed, the slide block 223 slides upwards and the turntable 22 rotates, the PCB is moved to the upper part of the detection table 21 and then slides downwards, the PCB is placed on the detection table 21, the sucker 226 is immediately released, after the placement, the slide block 223 moves upwards, the electric telescopic rod 224 shortens, the turntable 22 rotates, the sucker 226 is moved away from the PCB, the detector 12 which is slidably arranged on the top of the base frame 1 moves to the upper part of the PCB for photographing detection, the detector 12 moves back to the original position, and then the slide block 223 is controlled to move downwards, the electric telescopic rod 224 extends, the turntable 22 rotates, the sucker 226 moves to the PCB, one side of the PCB is sucked up, the driving rotor at the joint of the electric telescopic rod 224 and the connecting rod 225 drives the connecting rod 225 to turn upwards, the PCB is turned over, the sliding block 223 is controlled to move downwards immediately, the PCB is placed on the detection table 21, the sucker 226 is loosened immediately, the electric telescopic rod 224 is contracted, the driving rotor drives the connecting rod 225 to rotate downwards, the sliding block 223 moves upwards, and the sucker 226 is removed; then the detector 12 is moved to the upper part of the PCB, the back of the PCB is photographed and detected, after the front and back detection of the PCB is finished, the control sucker 226 is moved to the upper part of the PCB, the PCB is absorbed and moved to the conveyor belt 11, then the sucker is loosened, and the PCB is conveyed away; the invention utilizes the material moving mechanism to drive the sucker 226 to transfer the PCB, thereby replacing manual feeding and discharging, further achieving the purposes of conveniently detecting the PCB and maintaining the stability of working rhythm, and further improving the operation effect of the detection system of the PCB.

As an embodiment of the invention, the top of the material table 2 is fixedly connected with a fixed mount 23; the fixed frame 23 is provided with a slide rail; the slide rail is connected with the centering frame 231 in a sliding manner, a driven rail motor is installed in the slide rail, a fixedly connected electric push rod is arranged between the centering frame 231 and the rail motor, and the top end of the detection table 21 is fixedly connected with an L-shaped block 212; l-shaped block 212 and the centering frame 231 are diagonally distributed on the detection platform, one end of the centering frame 231 connected with the fixing frame 23 is automatically controlled to stretch out and draw back by the electric push rod, when the PCB is placed on the detection platform 21 by the suction cup 226, the fixing frame 23 is pushed to the same horizontal plane at the lower end of the PCB, and then the movement stretching and the L-shaped block 212 are controlled to cooperate to centralize the PCB.

As an embodiment of the present invention, a buffer pad 232 is adhered to the surfaces of the centering frame 231 and the L-shaped block 212 facing the center of the detection table 21, and a fixedly connected aluminum foil is covered on the surface of the buffer pad 232; can prevent through the blotter 232 that sets up when putting up 231 and L-shaped piece 212 simultaneous action, play the effect of buffering when the edge of PCB printed circuit board and the contact surface contact of putting up 231 and L-shaped piece 212, prevent to cause the injury to the edge of PCB printed circuit board, the tinfoil piece that links firmly on the blotter 232 can also avoid removing the friction between PCB printed circuit board in-process and blotter 232 and produce static, prevent to cause electrostatic damage to the components and parts on the PCB printed circuit board.

As an embodiment of the present invention, an annular corrugated section is disposed on the conical surface of the suction cup 226, a pressing sheet 227 fixedly connected to the edge of the port of the suction cup 226 is disposed, the strength of the pressing sheet 227 is lower than the solder foot of the component, and the pressing sheet 227 drives the edge of the suction cup 226 to generate deformation deflection when being stressed; when the sucker 226 contacts the surface of the PCB along with the lifting of the rotating body and generates the adsorption action, the pressing sheet 227 arranged at the port of the sucker 226 is pressed by the sucker 226 to deflect when contacting the PCB, and the pressing sheet 227 contacting the position of the raised element on the PCB can continuously generate the slippage along with the gradual pressing of the sucker 226, and the pressing sheet 227 is matched with the corrugated section on the conical surface of the sucker 226 and used as the allowance of the deformation of the pressing sheet 227 contacting the surface element of the PCB, so that the acting force of the pressing sheet 227 at the end part of the sucker 226 on the PCB can be limited in the safety range, the scratch caused by the pressing sheet 227 can be avoided, the pressing sheet 227 can drive the sucker 226 to shift towards the inner side or the outer side of the element according to the position relation between the position contacting the raised element and the sucker 226, and the element can be separated or wrapped, finally, the tail end of the sucker 226 completely contacts the surface of the PCB along with the pressing sheet 227, so that the sucker 226 is adsorbed on the PCB, and the operation process of the detection system of the PCB is stabilized.

As an embodiment of the present invention, the end of the pressing piece 227 is provided with a rounded corner; in PCB printed circuit board's testing process, through setting up the fillet at preforming 227 end, make preforming 227 when receiving the effect of sucking disc 226 to press to PCB printed circuit board surface, utilize the fillet end to be convenient for preforming 227 and produce on PCB printed circuit board surface and slide, avoid PCB printed circuit board to cause the fish tail to play the effect of protection to PCB printed circuit board.

As an embodiment of the present invention, the diaphragm 211 is disposed on the top of the detection platform 21, when the suction cup 226 is sucked to the hole site of the PCB, the suction cup 226 sucks the lower diaphragm 211 through the hole site of the PCB to block the hole site of the PCB to achieve the effect of sucking the PCB, when the diaphragm 211 and the PCB are sucked by the suction cup 226 at the same time, the connection rod 225 rotates to turn over the sucked PCB, place the sucked PCB on the detection platform 21, and suck and move the diaphragm 211 on the back of the PCB onto the material platform 2, so that the detector 12 can detect the back of the PCB, thereby stabilizing the operation effect of the detection system of the PCB.

The specific working process is as follows:

according to the invention, a controller is started, a PCB to be detected is directly placed on a conveyor belt 11 and is transported to a position close to a detection table 21 by the conveyor belt 11, an electric telescopic rod 224 extends, a rotary table 22 rotates to transfer a suction cup 226 to the position above the PCB, a slide block 223 slides downwards, after the PCB is absorbed, the slide block 223 slides upwards and the rotary table 22 rotates to move the PCB to the position above the detection table 21 and then slides downwards, the PCB is placed on the detection table 21, the suction cup is released, after the placement, the slide block 223 moves upwards, the electric telescopic rod shortens, the rotary table 22 rotates to remove the suction cup 226 from the PCB, then an electric push rod pushes a centering frame 231 to work together with an L-shaped block 212 to centralize the PCB, so that a detector 12 arranged on the top of a base frame 1 in a sliding mode moves to the position above the PCB for shooting detection, moving the detector 12 back to the original position, controlling the sliding block 223 to move downwards, extending the electric telescopic rod, rotating the turntable 22, moving the sucker 226 to the PCB, sucking up one side of the PCB, controlling the joint of the electric telescopic rod 224 and the connecting rod 225 to rotate upwards, turning the PCB over, controlling the sliding block 223 to move downwards, placing the PCB back to the detection table 21, releasing the sucker, contracting the electric telescopic rod 224, rotating the connecting rod 225 downwards, moving the sliding block 223 upwards, removing the sucker, centering the centering frame 231 and the L-shaped block 212 under the matching action, moving the detector 12 to the upper side of the PCB, photographing the back of the PCB for detection, controlling the sucker 226 to move to the upper side of the PCB after the front and back detection of the PCB is finished, and adsorbing and moving the sucker to the conveyor belt 11 to be conveyed away.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A PCB printed circuit board's detecting system which characterized in that: comprises a base frame (1), a material platform (2), a conveyor belt (11), a detector (12) and a controller; a material table (2) is arranged in the base frame (1), and the top of the material table (2) is fixedly connected with a detection table (21); a detector (12) is arranged above the detection table, and the detector (12) is slidably mounted on the base frame (1); a fixed conveyor belt (11) is arranged in the base frame (1), and the upper surface of the conveyor belt (11) is flush with the upper surface of the material platform (2); the material moving mechanism is further arranged in the base frame and comprises a rotary table (22), the rotary table (22) is rotatably mounted at the top end of the material table (2), a screw rod (221) and a sliding rod (222) are arranged on the rotary table (22), a sliding block (223) is in threaded transmission connection with the screw rod (221), the sliding block (223) is in sliding connection with the sliding rod (222), the side edge of the sliding block (223) is fixedly connected with an electric telescopic rod (224), the tail end of the electric telescopic rod (224) is rotatably connected with a connecting rod (225), and a driving rotor is arranged at the connection position of the connecting rod (225) and the electric telescopic rod (224); the bottom of the connecting rod (225) is fixedly connected with a sucker (226); the controller controls the operation of the detection system of the PCB.

2. The inspection system of a PCB of claim 1, wherein: the top of the material table (2) is fixedly connected with a fixed frame (23); a slide rail is arranged on the fixed frame (23); the slide rail is connected with the centering frame (231) in a sliding manner, and a driven rail motor is arranged in the slide rail; the swing frame (231) and the track motor are provided with fixedly connected electric push rods, and the top end of the detection table (21) is fixedly connected with an L-shaped block (212); the L-shaped blocks (212) and the centering frame (231) are diagonally distributed on the detection platform, and the centering frame (231) and the L-shaped blocks (212) simultaneously act to center the PCB.

3. The inspection system of a PCB of claim 1, wherein: the surface of the centering frame (231) and the surface of the L-shaped block (212) facing the center of the detection table (21) are adhered with a buffer pad (232), and the surface of the buffer pad (232) is also covered with a fixedly connected aluminum foil.

4. The inspection system of a PCB of claim 1, wherein: the conical surface of the sucker (226) is provided with an annular corrugated section, the edge of the port of the sucker is provided with a pressing sheet (227) which is fixedly connected, the strength of the pressing sheet (227) is lower than the welding leg of a component, and the pressing sheet (227) drives the edge of the sucker (226) to generate deformation deflection when stressed.

5. The inspection system of a PCB of claim 1, wherein: the end of the pressing sheet (227) far away from the suction cup (226) is a round angle.

6. The inspection system of PCB printed circuit board of claim 5, wherein: a membrane (211) is arranged at the top of the detection table (21).