A PCB board electrical testing machine

Abstract

The present invention provides a PCB board electrical testing machine, comprising a frame, a capacitance imaging detection mechanism, a reciprocating PCB board delivery and testing mechanism, a gantry-shaped pressing mechanism and a manipulator loading and unloading mechanism, wherein the reciprocating PCB board delivery and testing mechanism comprises a first linear module and a PCB board fixing table; the capacitance imaging detection mechanism comprises a gantry support, a second linear module and a camera positioning device and a planar array capacitance imaging detection device; the first linear module sequentially passes through the gantry-shaped pressing mechanism and the bottom of the gantry support; the gantry-shaped pressing mechanism comprises a first gantry support leg and a second gantry support leg, a first telescopic cylinder and a second telescopic cylinder respectively mounted on the first gantry support leg and the second gantry support leg, and a pressing plate mounted on the first telescopic cylinder and the second telescopic cylinder, wherein a window is arranged on the pressing plate. The PCB board electrical testing machine of the present invention realizes the automatic detection of PCB boards and improves the detection efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of PCB board detection, and in particular to a PCB board electrical detection machine. Background Art

[0002] PCB printed circuit boards are important electronic components. In general production lines, visual inspection staff are required to inspect the PCB boards one by one, which is labor-intensive, inefficient and misses many defects. The manual method is used to detect whether the circuits of each part of the PCB board meet the design parameter requirements. The detection speed is slow and cannot meet the needs of rapid detection, resulting in low work efficiency. No matter in terms of detection speed, efficiency and cost control, it is not satisfactory, which brings difficulties to the large-scale integrated production of enterprises.

[0003] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0004] The invention provides a PCB board electrical testing machine, aiming to solve the technical problems of low efficiency and low detection accuracy of manual detection of PCB board defects.

[0005] The technical solution of the present invention is as follows:

[0006] A PCB board electrical testing machine comprises a frame, and a capacitance imaging detection mechanism, a reciprocating PCB board delivery and testing mechanism, a gantry-shaped material pressing mechanism and a manipulator loading and unloading mechanism arranged on a table of the frame, wherein the reciprocating PCB board delivery and testing mechanism comprises a first linear module and a PCB board fixing table arranged on the first linear module; the capacitance imaging detection mechanism comprises a gantry support, a second linear module arranged on the gantry support, and a camera positioning device and a planar array capacitance imaging detection device arranged on the second linear module; the first linear module passes through the gantry-shaped material pressing mechanism and the bottom of the gantry support in sequence; the gantry-shaped material pressing mechanism comprises a first gantry support foot and a second gantry support foot respectively arranged on both sides of the first linear module, a first telescopic cylinder and a second telescopic cylinder respectively mounted on the first gantry support foot and the second gantry support foot, and a pressing plate mounted on the first telescopic cylinder and the second telescopic cylinder, wherein the pressing plate is provided with a window for exposing the PCB board on the PCB board fixing table for the camera positioning device and the planar array capacitance imaging detection device to collect images.

[0007] In an optional embodiment of the present invention, the PCB board fixing platform includes a bottom plate and a top plate suspended above the bottom plate by a plurality of latches, the top plate is provided with a groove for accommodating the PCB board, the groove wall of the groove is provided with a notch for facilitating the removal of the PCB board from the groove, and the bottom plate is mounted on the slider of the first linear module by hand screws.

[0008] In an optional embodiment of the present invention, the camera positioning device and the planar array capacitive imaging detection device are installed on the second linear module via a T-shaped plate, the transverse plate portion of the T-shaped plate is connected to the slider of the second linear module, and the camera positioning device and the planar array capacitive imaging detection device are arranged on the vertical plate of the T-shaped plate.

[0009] In an optional embodiment of the present invention, the camera positioning device includes an up and down fine-tuning mechanism arranged on the vertical plate of the T-shaped plate, a camera installed on the up and down fine-tuning mechanism, and a light source assembly arranged below the camera through an L-shaped connector.

[0010] In an optional embodiment of the present invention, the robot loading and unloading mechanism includes four pallet placement positions distributed in a field shape on the surface of the table plate of the frame, and a PCB board transfer robot arranged in the center of the four pallet placement positions; wherein each of the pallet placement positions is composed of four L-shaped limiting edges that are spaced apart from each other and distributed in a quadrilateral.

[0011] In an optional embodiment of the present invention, a pallet lifting device is provided in each of the pallet placement positions, and the pallet lifting device includes a pallet carrying plate, and a screw driving assembly arranged below the pallet carrying plate; the screw driving assembly includes a first hanging bracket fixedly connected to the bottom surface of the table plate of the frame, a screw motor installed on the first hanging bracket, and a support frame fixed on the screw nut of the screw motor and used to push the pallet carrying plate up and down.

[0012] In an optional embodiment of the present invention, the first bracket includes a motor mounting plate and a first support column and a second support column vertically arranged at both ends of the motor mounting plate, the support frame includes a screw nut mounting plate and a first support plate and a second support plate vertically arranged at intervals on the screw nut mounting plate, the first support plate and the second support plate are both connected to the bottom surface of the pallet bearing plate, and a first sleeve and a second sleeve are arranged at both ends of the screw nut mounting plate, and the first sleeve and the second sleeve are respectively slidably mounted on the first support column and the second support column.

[0013] In an optional embodiment of the present invention, the pallet lifting device also includes an optocoupler sensing component for sensing the movement position of the screw nut mounting plate, the optocoupler sensing component includes a sensor mounting strip arranged on the motor mounting plate, a plurality of optocoupler sensors arranged at intervals on the sensor mounting strip, and a baffle arranged on the screw nut mounting plate.

[0014] In an alternative embodiment of the present invention, the PCB board transfer manipulator includes a manipulator mounting base, a manipulator joint disposed on the manipulator mounting base, a rotation motor disposed at the end of the manipulator joint, and a first PCB board grasping mechanism and a second PCB board grasping mechanism mounted on the rotation shaft of the rotation motor through a C-shaped plate. The top edge facing the opening of the C-shaped plate is connected to the rotation shaft of the rotation motor. A third telescopic cylinder and a fourth telescopic cylinder are respectively mounted on the left side edge and the right side edge of the C-shaped plate. The first PCB board grasping mechanism and the second PCB board grasping mechanism are respectively connected to the third telescopic cylinder and the fourth telescopic cylinder.

[0015] In an alternative embodiment of the present invention, both the first PCB board grasping mechanism and the second PCB board grasping mechanism include a suction cup mounting plate, chutes provided at four corners of the suction cup mounting plate and having sliding directions pointing to the center of the suction cup mounting plate, and suction nozzles mounted in the chutes.

[0016] The beneficial effects are as follows: The present invention provides a PCB board electrical testing machine, which includes a frame, a capacitance imaging detection mechanism, a reciprocating PCB board feeding and testing mechanism, a gantry-shaped pressing mechanism, and a manipulator loading and unloading mechanism. The reciprocating PCB board feeding and testing mechanism includes a first linear module and a PCB board fixing table; the capacitance imaging detection mechanism includes a gantry bracket, a second linear module, a camera positioning device, and a planar array capacitance imaging detection device; the first linear module sequentially passes under the gantry-shaped pressing mechanism and the gantry bracket; the gantry-shaped pressing mechanism includes a first gantry support leg, a second gantry support leg, a first telescopic cylinder and a second telescopic cylinder respectively mounted on the first gantry support leg and the second gantry support leg, and a pressing plate erected on the first telescopic cylinder and the second telescopic cylinder. A window is provided on the pressing plate. The PCB board electrical testing machine of the present invention realizes the automatic detection of PCB boards and improves the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a PCB board electrical testing machine of the present invention.

[0018] Figure 2 It is a schematic structural diagram of the detection part of a PCB board electrical testing machine of the present invention.

[0019] Figure 3 It is Figure 2 an enlarged view of area A in

[0020] Figure 4 It is a schematic structural diagram of a screw rod pushing assembly of the present invention.

[0021] Figure 5 It is Figure 4 an enlarged view of area B in

[0022] Figure 6 The present invention is a schematic diagram of the installation structure of a first PCB board grabbing mechanism and a second PCB board grabbing mechanism.

[0023] The figures are as follows:

[0024] 10-frame; 20-capacitive imaging detection mechanism; 30-reciprocating PCB board delivery and detection mechanism; 40-gantry pressing mechanism; 50-manipulator loading and unloading mechanism; 60-first linear module; 70-PCB board fixing table; 80-gantry bracket; 90-second linear module; 100-camera positioning device; 610-planar array capacitive imaging detection device; 110-first gantry support foot; 120-second gantry support foot; 130-first telescopic cylinder; 140-second telescopic cylinder; 150-pressing plate; 160-window; 170-bottom plate; 180-latch; 190-top plate; 210-notch; 220-hand screw; 230-T-type plate; 240-up and down fine-tuning mechanism; 250-camera; 260-L-shaped connector; 270-light source assembly; 280-tray placement card; 290-PCB board transfer manipulator; 300-L Type limiting edge; 310-tray lifting device; 320-tray bearing plate; 330-screw driving assembly; 340-first bracket; 350-screw motor; 370-support frame; 380-motor mounting plate; 390-first support column; 400-second support column; 410-screw nut mounting plate; 420-first support plate; 430-second support plate; 440-first sleeve; 450-second sleeve; 460- Sensor mounting strip; 470- optocoupler sensor; 480- baffle; 490- manipulator mounting seat; 500- manipulator joint; 510- rotating motor; 520- molded plate; 530- first PCB board grabbing mechanism; 540- second PCB board grabbing mechanism; 550- rotating shaft; 560- third telescopic cylinder; 570- fourth telescopic cylinder; 580- suction cup mounting plate; 590- slide groove; 600- suction nozzle. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1The present invention provides a PCB board electrical testing machine, comprising a frame 10, and a capacitive imaging detection mechanism 20, a reciprocating PCB board delivery mechanism 30, a gantry-shaped pressing mechanism 40 and a manipulator loading and unloading mechanism 50 arranged on a table of the frame 10, see Figure 2 The reciprocating PCB board delivery mechanism 30 includes a first linear module 60 and a PCB board fixing table 70 arranged on the first linear module 60; the capacitive imaging detection mechanism 20 includes a gantry bracket 80, a second linear module 90 arranged on the gantry bracket 80, and a camera positioning device 100 and a planar array capacitive imaging detection device 610 arranged on the second linear module 90; the first linear module 60 passes through the gantry-shaped pressing mechanism 40 and the bottom of the gantry bracket 80 in sequence; the gantry-shaped pressing mechanism 40 includes a split A first gantry leg 110 and a second gantry leg 120 are respectively arranged on both sides of the first linear module 60, a first telescopic cylinder 130 and a second telescopic cylinder 140 are respectively installed on the first gantry leg 110 and the second gantry leg 120, and a pressing plate 150 is mounted on the first telescopic cylinder 120 and the second telescopic cylinder 130, and a window 160 is provided on the pressing plate 150 for exposing the PCB board on the PCB board fixing platform 70 for the camera positioning device and the planar array capacitive imaging detection device 100 to collect images. When the PCB board electrical testing machine of the present invention is in operation, the manipulator loading and unloading mechanism 50 first grabs the PCB board and places it on the PCB board fixing table 70, the first linear module 60 moves to send the PCB board fixing table 70 to the bottom of the gantry-shaped pressing mechanism 40, the gantry-shaped pressing mechanism 40 presses the PCB board on the PCB board fixing table 70, and then the second linear module 90 drives the camera positioning device and the planar array capacitive imaging detection device 100 to move to the top of the PCB board for image acquisition. The PCB board electrical testing machine of the present invention realizes the automation of PCB board detection and improves the detection efficiency of PCB boards.

[0027] It should be noted that planar array capacitance imaging is a prior art, and the planar array capacitance imaging device includes a capacitance sensor, a data measurement and acquisition module, and a computer; the capacitance sensor converts the distribution of the object field medium of the object to be measured into a capacitance value; the data measurement and acquisition module is used to measure and collect the capacitance value between any two electrode sheets, and transmit the measured capacitance data to the computer; the computer optimizes the capacitance data through a fuzzy C-means clustering algorithm, uses the optimized capacitance value as the image reconstruction value, and combines a non-iterative image processing algorithm or an iterative image processing algorithm to reconstruct the defect image to obtain a reconstructed image. In another embodiment of the present invention, the capacitance imaging detection mechanism for detecting the PCB board can also be replaced with its visual detection mechanism (CCD camera).

[0028] See also Figure 2In an optional embodiment of the present invention, the PCB board fixing platform 70 includes a bottom plate 170 and a top plate 190 suspended and mounted on the bottom plate 170 by a plurality of latches 180, the top plate 190 is provided with a groove for accommodating the PCB board, the groove wall of the groove is provided with a notch 210 for facilitating the removal of the PCB board from the groove, and the bottom plate 170 is mounted on the slider of the first linear module 60 by a hand screw 220. In this embodiment, the PCB board fixing platform 70 of the present invention can be quickly replaced with other types of PCB board detection by the hand screw 220, the bottom plate 170 and the top plate 190 are connected by a latch to reduce the mass of the PCB board fixing platform 70 and extend the service life of the first linear module 60, and the bottom plate 170 and the top plate 190 are connected by the latch 180 to facilitate the adjustment of the height of the top plate 190.

[0029] See also Figure 2 In an optional embodiment of the present invention, the camera positioning device 100 and the planar array capacitive imaging detection device 610 are installed on the second linear module 90 through a T-shaped plate 230, the transverse plate portion of the T-shaped plate 230 is connected to the slider of the second linear module 90, and the camera positioning device and the planar array capacitive imaging detection device 100 are arranged on the vertical plate of the T-shaped plate 230. In this embodiment, the function of the T-shaped plate 230 is to facilitate the camera positioning device and the planar array capacitive imaging detection device 100 to face the side of the gantry-shaped pressing mechanism 40, and the T-shaped plate 230 can also increase the area of ​​the slider on the second linear module 90 where the sensor can be installed, so that a variety of detection devices for detecting different defects of the PCB board can be arranged on the T-shaped plate 230, so as to realize more detection functions of the PCB board electrical testing machine.

[0030] See also Figure 3 In an optional embodiment of the present invention, the camera positioning device 100 includes an up-down fine-tuning mechanism 240 disposed on the vertical plate of the T-plate 230, a camera 250 mounted on the up-down fine-tuning mechanism 240, and a light source assembly 270 disposed below the camera 250 via an L-shaped connector 260. In this embodiment, in order to achieve clearer image acquisition, the camera 250 in the present invention can also adjust the distance between itself and the PCB board to be tested through the up-down fine-tuning mechanism 240.

[0031] See also Figure 1In an optional embodiment of the present invention, the manipulator loading and unloading mechanism 50 includes four tray placement positions 280 distributed in a field shape on the surface of the table of the rack 10, and a PCB board transfer manipulator 290 arranged at the center of the four tray placement positions 280; wherein each of the tray placement positions 280 is composed of four L-shaped limiting edges 300 spaced from each other and distributed in a quadrilateral. In this embodiment, the four L-shaped limiting edges 300 can just wrap the four corners of the PCB board tray, and can well limit the PCB board tray on the rack. For example, the four tray placement positions 280 are used to place the PCB board to be tested, the PCB board that has been tested OK, the PCB board with an open circuit defect, and the PCB board with a short circuit defect, respectively. The four tray placement positions 280 are arranged around the PCB board transfer manipulator 290, and the structure is more compact.

[0032] See also Figure 1 In an optional embodiment of the present invention, a pallet lifting device 310 is disposed in each of the pallet placement positions 280, and the pallet lifting device 310 includes a pallet carrying plate 320 and a screw driving assembly 330 disposed below the pallet carrying plate 280; see Figure 4 The screw driving assembly 330 includes a first bracket 340 fixedly connected to the bottom surface of the table of the frame 10, a screw motor 350 mounted on the first bracket 340, and a support frame 370 fixed on the screw nut of the screw motor 350 and used to drive the tray carrier plate 280 to rise and fall. In this embodiment, the tray carrier plate 280 is driven by the screw motor 350, which can more easily control the lifting height of the tray carrier plate 280 and reduce the shaking of the tray carrier plate 280 during the lifting process.

[0033] See also Figure 4In an optional embodiment of the present invention, the first bracket 340 includes a motor mounting plate 380 and a first support column 390 and a second support column 400 vertically arranged at both ends of the motor mounting plate 380, the support frame 370 includes a screw nut mounting plate 410 and a first support plate 420 and a second support plate 430 vertically arranged on the screw nut mounting plate 410 at intervals, the first support plate 420 and the second support plate 430 are both connected to the bottom surface of the tray supporting plate 280, and the first sleeve 440 (linear bearing) and the second sleeve 450 (linear bearing) are arranged at both ends of the screw nut mounting plate 410, and the first sleeve 440 and the second sleeve 450 are respectively slidably mounted on the first support column 390 and the second support column 400. In this embodiment, the guiding mechanism formed by the first sleeve 440, the second sleeve 450, the first support column 390 and the second support column 400 can further improve the stability of the lifting and lowering of the tray supporting plate 280. In addition, a second bracket is provided above the screw of the screw motor 350 to improve the rotation stability of the screw. The top of the screw of the screw motor 350 passes through the second bracket and cooperates with the second bracket through a bearing.

[0034] See also Figure 5 In an optional embodiment of the present invention, the tray lifting device 310 further includes an optical coupling induction component for sensing the moving position of the screw nut mounting plate 410, and the optical coupling induction component includes an induction mounting strip 460 disposed on the motor mounting plate 380, a plurality of optical coupling sensors 470 disposed at intervals on the induction mounting strip 460, and a baffle 480 disposed on the screw nut mounting plate 410. In this embodiment, the optical coupling sensor 470 can be used to easily know the lifting distance of the screw nut mounting plate 410 each time, thereby facilitating the lifting and positioning of the tray carrier plate 280 above the screw nut mounting plate 410. The number of optical coupling sensors 470 can be set according to actual needs, and can be specifically determined by the number of PCB board trays, and the lifting height of the PCB board trays can be divided into as many levels as the number of PCB board trays.

[0035] See also Figure 1 In an optional embodiment of the present invention, the PCB board transfer robot 290 includes a robot mounting seat 490, a robot joint 500 arranged on the robot mounting seat 490, a rotating motor 510 arranged at the end of the robot joint 500, and a first PCB board grasping mechanism 530 and a second PCB board grasping mechanism 540 mounted on the rotating shaft of the rotating motor 510 through a molded plate 520, see Figure 6, the top edge facing the opening of the U-shaped plate 520 is connected to the rotating shaft 550 of the rotating motor 510. A third telescopic cylinder 560 and a fourth telescopic cylinder 570 are respectively installed on the left side and the right side of the U-shaped plate 520. The first PCB board grasping mechanism 530 and the second PCB board grasping mechanism 540 are respectively connected to the third telescopic cylinder 560 and the fourth telescopic cylinder 570. In this embodiment, the PCB board transfer manipulator 290 can grasp 2 pieces of待测 PCB boards at a time. After one PCB board is tested, the other PCB board can be immediately tested next time. This can reduce the number of times the PCB board transfer manipulator 290 picks up and places the待测 PCB boards, extend the service life of the manipulator and improve the test efficiency.

[0036] See Figure 6 , in an alternative embodiment of the present invention, both the first PCB board grasping mechanism 530 and the second PCB board grasping mechanism 540 include a suction cup mounting plate 580, a chute 590 provided at four corners of the suction cup mounting plate 580 and with a sliding direction pointing to the center of the suction cup mounting plate 580, and a suction nozzle 600 installed in the chute 590. In this embodiment, the 4 suction nozzles 600 form a rectangle with adjustable size, so as to meet the grasping of PCB boards with different sizes. There are 2 nuts threadedly connected to the suction nozzle 600. When fixing, the suction cup mounting plate 580 is clamped between the 2 nuts. When adjusting the position, just loosen the nuts.

[0037] In summary, the present invention provides a PCB board electrical testing machine, including a frame, a capacitance imaging detection mechanism, a reciprocating PCB board feeding and testing mechanism, a gantry-shaped pressing mechanism and a manipulator loading and unloading mechanism. The reciprocating PCB board feeding and testing mechanism includes a first linear module and a PCB board fixing table; the capacitance imaging detection mechanism includes a gantry bracket, a second linear module, a camera positioning device and a planar array capacitance imaging detection device; the first linear module sequentially passes under the gantry-shaped pressing mechanism and the gantry bracket; the gantry-shaped pressing mechanism includes a first gantry support leg, a second gantry support leg, a first telescopic cylinder and a second telescopic cylinder respectively installed on the first gantry support leg and the second gantry support leg, and a pressing plate erected on the first telescopic cylinder and the second telescopic cylinder. There is a window on the pressing plate. The PCB board electrical testing machine of the present invention realizes the automatic detection of PCB boards and improves the detection efficiency.

[0038] Although the present invention has been disclosed above with preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those of ordinary skill in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention is subject to the scope defined by the claims.

Claims

1. A PCB board electrical testing machine, characterized in that: The invention comprises a frame, and a capacitance imaging detection mechanism, a reciprocating PCB board delivery and detection mechanism, a gantry-shaped pressing mechanism and a manipulator loading and unloading mechanism arranged on a table of the frame, characterized in that the reciprocating PCB board delivery and detection mechanism comprises a first linear module and a PCB board fixing table arranged on the first linear module; the capacitance imaging detection mechanism comprises a gantry support, a second linear module arranged on the gantry support, and a camera positioning device and a planar array capacitance imaging detection device arranged on the second linear module; the first linear module passes through the gantry-shaped pressing mechanism and the bottom of the gantry support in sequence; the gantry-shaped pressing mechanism comprises a first gantry support foot and a second gantry support foot respectively arranged on both sides of the first linear module, a first telescopic cylinder and a second telescopic cylinder respectively mounted on the first gantry support foot and the second gantry support foot, and a pressing plate mounted on the first telescopic cylinder and the second telescopic cylinder, and the pressing plate is provided with a window for exposing the PCB board on the PCB board fixing table for the camera positioning device and the planar array capacitance imaging detection device to collect images.

2. The PCB board electrical testing machine according to claim 1, characterized in that: The PCB board fixing platform includes a bottom plate and a top plate suspended above the bottom plate by a plurality of latches, the top plate is provided with a groove for accommodating the PCB board, the groove wall of the groove is provided with a notch for facilitating the PCB board to be taken out of the groove, and the bottom plate is installed on the slider of the first linear module by hand screws.

3. The PCB board electrical testing machine according to claim 1 or 2, characterized in that: The camera positioning device and the planar array capacitive imaging detection device are installed on the second linear module via a T-shaped plate, the transverse plate portion of the T-shaped plate is connected to the slider of the second linear module, and the camera positioning device and the planar array capacitive imaging detection device are arranged on the vertical plate of the T-shaped plate.

4. The PCB board electrical testing machine according to claim 3, characterized in that: The camera positioning device includes an up-and-down fine-tuning mechanism arranged on the vertical plate of the T-shaped plate, a camera installed on the up-and-down fine-tuning mechanism, and a light source assembly arranged below the camera through an L-shaped connector.

5. The PCB board electrical testing machine according to claim 1, characterized in that: The robot loading and unloading mechanism includes four pallet placement positions distributed in a field shape on the surface of the table top of the frame, and a PCB board transfer robot arranged in the center of the four pallet placement positions; wherein each of the pallet placement positions is composed of four L-shaped limiting edges that are spaced apart from each other and distributed in a quadrilateral.

6. The PCB board electrical testing machine according to claim 5, characterized in that: A pallet lifting device is provided in each of the pallet placement positions, and the pallet lifting device includes a pallet carrying plate and a screw driving assembly arranged below the pallet carrying plate; the screw driving assembly includes a first hanging bracket fixedly connected to the bottom surface of the table plate of the frame, a screw motor installed on the first hanging bracket, and a support frame fixed on the screw nut of the screw motor and used for driving the pallet carrying plate to rise and fall.

7. The PCB board electrical testing machine according to claim 6, characterized in that: The first hanger includes a motor mounting plate, and a first support column and a second support column vertically arranged at both ends of the motor mounting plate. The support frame includes a screw nut mounting plate, and a first support plate and a second support plate vertically arranged at intervals on the screw nut mounting plate. Both the first support plate and the second support plate are connected to the bottom surface of the tray bearing plate. First sleeves and second sleeves are arranged at both ends of the screw nut mounting plate, and the first sleeve and the second sleeve are respectively sleeved on the first support column and the second support column in a sliding manner.

8. The PCB board electrical testing machine according to claim 7, characterized in that: The tray lifting device further includes an opto-coupler induction component for sensing the movement position of the screw nut mounting plate. The opto-coupler induction component includes an inductor mounting strip plate arranged on the motor mounting plate, a plurality of opto-coupler inductors arranged at intervals on the inductor mounting strip plate, and a baffle arranged on the screw nut mounting plate.

9. The PCB board electrical testing machine according to claim 5, characterized in that: The PCB board transfer manipulator includes a manipulator mounting seat, a manipulator joint arranged on the manipulator mounting seat, a rotating motor arranged at the end of the manipulator joint, and a first PCB board grasping mechanism and a second PCB board grasping mechanism mounted on the rotating shaft of the rotating motor through a C-shaped plate. The top edge facing the opening of the C-shaped plate is connected to the rotating shaft of the rotating motor, and a third telescopic cylinder and a fourth telescopic cylinder are respectively mounted on the left side edge and the right side edge of the C-shaped plate. The first PCB board grasping mechanism and the second PCB board grasping mechanism are respectively connected to the third telescopic cylinder and the fourth telescopic cylinder.

10. The PCB board electrical testing machine according to claim 9, characterized in that: Both the first PCB board grasping mechanism and the second PCB board grasping mechanism include a suction cup mounting plate, sliding grooves arranged at the four corners of the suction cup mounting plate and with sliding directions pointing to the center of the suction cup mounting plate, and suction nozzles mounted in the sliding grooves.

Images