PCB feeding and discharging conveying device

Abstract

The application relates to a feeding and discharging conveying device of a PCB (Printed Circuit Board), and relates to the technical field of PCB testing.The feeding and discharging conveying device of the PCB comprises a rack, a row wheel conveying assembly and a board placing assembly.The rack comprises a main support and an auxiliary support, and the main support and the auxiliary support are fixedly connected with each other.The row wheel conveying assembly is connected with the auxiliary support, and the row wheel conveying assembly comprises a first screw rod assembly and a row wheel set.The first screw rod assembly is connected with the auxiliary support and the row wheel set, and the row wheel set is used for conveying PCB workpieces.The board placing assembly is connected with the main support, and the board placing assembly comprises a board placing frame and a moving assembly.The moving assembly is slidingly connected with the main support, and the board placing frame comprises a discharging board placing plate, a table top beam and a discharging connecting plate.The discharging board placing plate is fixedly connected with the moving assembly, the table top beam is arranged at two ends of the discharging board placing plate and is fixedly connected with the moving assembly, and the discharging connecting plate is connected with one end of the table top beam away from the discharging board placing plate.The row wheel set is arranged between the two table top beams, and the board placing frame is used for bearing vertically stacked PCB workpieces.

Description

Technical Field

[0001] This application relates to the technical field of PCB board testing, and more particularly to a PCB board loading and unloading conveying device. Background Technology

[0002] In the functional testing of PCB boards, flying probe testing is required. Flying probes interact with predetermined points on the board to test its functions. In order to ensure the stability and accuracy of the test, flying probe testing often involves manually transporting the PCB board to the flying probe testing machine for functional testing, and then transporting it out after testing. Since the testing time is long, a lot of manual time is required to replace the board for testing in a timely manner, resulting in low testing efficiency.

[0003] Invention Patent

[0004] This application provides a PCB board loading and unloading transportation device to solve the technical problems in the prior art, such as long testing time, the need to spend a lot of manual time to change boards for testing in a timely manner, and low testing efficiency.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: to provide a PCB board loading and unloading conveying device, the PCB board loading and unloading conveying device comprising:

[0006] The frame includes a main support and a secondary support, wherein the main support and the secondary support are connected and fixed to each other.

[0007] A wheeled transport assembly is connected to the sub-support. The wheeled transport assembly includes a first lead screw assembly and a wheeled assembly. The first lead screw assembly connects the sub-support and the wheeled assembly. The wheeled assembly is used to transport PCB board workpieces.

[0008] A board placement assembly is connected to the main support. The board placement assembly includes a board placement frame and a moving component. The moving component is slidably connected to the main support. The board placement frame includes a discharge board, a table beam, and a discharge connecting plate. The discharge board is fixedly connected to the moving component. The table beam is located at both ends of the discharge board and is fixedly connected to the moving component. The discharge connecting plate is connected to the end of the table beam away from the discharge board. A roller assembly is located between two table beams. The board placement frame is used to support vertically stacked PCB board workpieces.

[0009] By adopting the above technical solution, the staff places the vertically stacked PCB workpieces between the discharge plate and the discharge connecting plate. The first lead screw assembly drives the roller assembly to move upward, and after a PCB workpiece is abutted, the roller assembly transports it to the testing station. Then, the first lead screw assembly drives the roller assembly to move downward, and the moving component drives the board placement frame to move, so that the next PCB workpiece corresponds and matches with the roller assembly. The roller assembly then transports the next PCB workpiece out, completing the automatic loading and transportation operation. The automatic unloading is based on the same principle as the automatic loading, and its structure is simple and its working efficiency is high.

[0010] Optionally, the wheel assembly includes a lifting mounting plate, friction wheels, a synchronous belt, and a plate clamp drive pulley. The lifting mounting plate is connected to the first lead screw assembly. Multiple friction wheels and multiple plate clamp drive pulleys are respectively located on both sides of the lifting mounting plate. Each friction wheel and each plate clamp drive pulley are correspondingly connected in a transmission manner. The multiple plate clamp drive pulleys are connected to each other through the synchronous belt.

[0011] By adopting the above technical solution, the first lead screw assembly drives the lifting mounting plate to move up and down, multiple friction wheels match and correspond with the PCB board workpiece, the board clamp transmission pulley is connected to the friction wheel transmission, the synchronous belt moves, the synchronous belt drives the board clamp transmission pulley to move, and then drives the friction wheel to rotate, so that multiple friction wheels move synchronously, realizing the stable transportation of the PCB board workpiece by the friction wheel.

[0012] Optionally, the first lead screw assembly includes a lifting guide rod, a lifting guide sleeve seat, an upper end plate of the guide rod, a bearing seat, and a lifting lead screw. The bearing seat is disposed on the sub-support, and the lifting guide sleeve seats are provided on both sides of the bearing seat. The lifting guide sleeve seats are disposed on the sub-support, the lifting guide rod is disposed in the lifting guide sleeve seat, and the lifting lead screw is disposed in the bearing seat. The upper end plate of the guide rod is connected and fixed to the upper end of the lifting guide rod and the lifting lead screw, and the upper end plate of the guide rod is connected and fixed to the wheel assembly.

[0013] By adopting the above technical solution, the upper end plate of the guide rod is connected to the lifting mounting plate, two lifting guide rods are set at both ends of the upper end plate of the guide rod, and the lifting screw is set between the two lifting guide rods. The lifting screw is set in the bearing seat and rotates to make the entire first screw assembly move up and down. The lifting guide rod moves up and down synchronously. The lifting guide rod is set in the lifting guide sleeve seat to make the up and down movement more stable and prevent the deviation from occurring during the up and down movement. Its structure is simple, the movement is stable, and the error is reduced.

[0014] Optionally, the main support includes an upper support, a lower support, and a reinforcing plate. The upper support and the lower support are connected and fixed together by the reinforcing plate. The sub-support is connected and fixed together with the lower support. The upper support is provided with a first mounting plate, and the lower support is provided with a second mounting plate.

[0015] By adopting the above technical solution, slide rails are set on the first mounting plate and the second mounting plate to allow the moving component to move along the first mounting plate and the second mounting plate. The reinforcing plate connects the upper bracket and the lower bracket, making the overall structure more stable, realizing the stable movement of the board placement frame, and ensuring the stable transportation of PCB board workpieces.

[0016] Optionally, the moving component includes a first moving component and a second moving component. The first moving component includes a first slide rail, a second slide rail, a first slider, a second slider, a support plate, and a second lead screw assembly. The first slide rail is disposed on the first mounting plate. The first slider is connected to the upper end of the support plate and is slidably connected to the first slide rail. The second slide rail is disposed on the second mounting plate. The second slider is connected to the lower end of the support plate and is slidably connected to the second slide rail. The second lead screw assembly is disposed on the second mounting plate and between the second slide rails. The second lead screw assembly is connected to the second slider.

[0017] By adopting the above technical solution, the first slider is matched with the first slide rail, the second slider is matched with the second slide rail, the pallet is connected and fixed to the first slider and the second slider, the pallet is connected and fixed to the pallet rack, and when the pallet moves along the first slide rail and the second slide rail, it drives the pallet rack to move. The second lead screw assembly drives the pallet to move. The structure is simple and the transportation is stable.

[0018] Optionally, the second lead screw assembly includes a lead screw mounting seat, a lead screw positioning seat, and a translation lead screw. The translation lead screw is disposed between the second slide rails. One end of the second slide rail is provided with the lead screw mounting seat, and the other end of the second slide rail is provided with the lead screw positioning seat. The translation lead screw connects the lead screw mounting seat and the lead screw positioning seat.

[0019] By adopting the above technical solution, the lead screw mounting base and the lead screw positioning base are connected to the translation lead screw, so that the translation lead screw remains stable during rotation, thereby enabling the pallet to move stably and ensuring the stable transportation of PCB board workpieces.

[0020] Optionally, the second moving component includes a vertical guide rod, a vertical lead screw, and a lifting connecting plate. The lifting connecting plate connects the two table beams and is located below the discharge plate. The vertical guide rod is located at both ends of the discharge plate, with its lower end connected to the lifting connecting plate. The vertical lead screw connects the discharge plate and the lifting connecting plate and is located between the two vertical guide rods.

[0021] By adopting the above technical solution, the vertical guide rod and the vertical lead screw connect the discharge plate and the lifting connecting plate. The vertical lead screw and the vertical guide rod move up and down synchronously, causing the lifting connecting plate and the discharge plate to move up and down, thereby driving the entire plate-laying frame to move up and down, so that the height of the PCB board workpiece on the plate-laying frame is consistent with the height of the workstation to be placed, so that the PCB board workpiece can be accurately transported to the workstation to be placed.

[0022] Optionally, the plate-laying assembly includes a photoelectric sensor bracket, which is located on the outer side of the table crossbeam.

[0023] By adopting the above technical solution, when the plate-laying frame moves up and down to align with the workstation, the photoelectric sensor bracket detects the specific height, enabling the moving component to accurately drive the plate-laying frame to the correct height, thus improving accuracy.

[0024] Optionally, the board placement assembly includes a positioning sensor. The PCB board workpiece is transported to the testing host for testing. The positioning sensor is located on the left and right side entry and exit beams of the testing host and is used to sense the PCB board workpiece.

[0025] By adopting the above technical solution, after the positioning sensor detects the corresponding PCB board workpiece, the wheel assembly starts to move and transports the PCB board workpiece out, thus completing the accurate transportation of the PCB board workpiece.

[0026] Optionally, the wheel assembly includes a sensing guide block, which is disposed on the lifting mounting plate. The sensing guide block and the friction wheel are disposed on the same horizontal straight line, and the sensing guide block is provided with a guide groove.

[0027] By adopting the above technical solution, the guide groove on the induction guide block is used to guide the PCB board workpiece during the transportation of the wheel assembly, so as to prevent the PCB board workpiece from shifting position during transportation and falling off.

[0028] The beneficial effects of this application are as follows: This application provides a PCB board loading and unloading transportation device. The operator places vertically stacked PCB board workpieces between the unloading plate and the unloading connecting plate. The first lead screw assembly drives the roller assembly to move upward, and after abutting a PCB board workpiece, the roller assembly transports it to the testing station. Then, the first lead screw assembly drives the roller assembly to move downward, and the moving component drives the board placement frame to move, so that the next PCB board workpiece corresponds and matches with the roller assembly. The roller assembly then transports the next PCB board workpiece out, completing the automatic loading and transportation operation. Automatic unloading involves transporting the processed PCB board to this device, which is the same as the PCB board loading and transportation principle. Its structure is simple, and its working efficiency is high, realizing the automatic loading and unloading transportation of PCB board workpieces. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0030] Figure 1 This is a schematic diagram of the overall structure of a PCB board loading and unloading conveying device provided in an embodiment of this application;

[0031] Figure 2 This is a schematic diagram of the plate-laying frame provided in an embodiment of this application;

[0032] Figure 3 This is a schematic diagram of the structure of the wheel assembly provided in the embodiments of this application;

[0033] Figure 4 This is a schematic diagram of the structure of the secondary support and the first lead screw assembly provided in the embodiments of this application;

[0034] Figure 5 This is a schematic diagram of the structure of the mobile component provided in an embodiment of this application;

[0035] Figure 6 This is a schematic diagram of the main support structure provided in this embodiment.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100. Frame; 110. Main support; 111. Upper support; 112. Lower support; 113. Reinforcing plate; 114. First mounting plate; 115. Second mounting plate; 120. Auxiliary support; 200. Wheel transport assembly; 211. Lifting guide rod; 212. Lifting guide sleeve seat; 213. Upper end plate of guide rod; 214. Bearing seat; 215. Lifting screw; 220. Wheel assembly; 221. Lifting mounting plate; 222. Friction wheel; 223. Synchronous belt; 224. Plate clamp transmission pulley; 225. 1. Induction guide block; 226. Guide groove; 300. Plate feeding assembly; 311. Discharge plate; 312. Table crossbeam; 313. Discharge connecting plate; 321. First slide rail; 322. Second slide rail; 323. First slider; 324. Second slider; 325. Support plate; 326. Vertical guide rod; 327. Vertical lead screw; 328. Lifting connecting plate; 331. Lead screw mounting seat; 332. Lead screw positioning seat; 333. Translation lead screw; 340. Photoelectric induction bracket; 350. Position sensing plate. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0040] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0041] like Figures 1 to 6 As shown, this application provides a PCB board loading and unloading transportation device, which includes a frame 100, a wheeled transportation assembly 200, and a board placement assembly 300.

[0042] The frame 100 includes a main support 110 and a secondary support 120. The main support 110 and the secondary support 120 are connected and fixed to each other. The main support 110 and the secondary support 120 are vertically connected. The bottom of the secondary support 120 is provided with a mounting plate, which is in contact with the ground and supports the entire frame 100.

[0043] The wheel transport assembly 200 is connected to the sub-support 120. The wheel transport assembly 200 includes a first lead screw assembly and a wheel group 220. The first lead screw assembly connects the sub-support 120 and the wheel group 220. The wheel group 220 is used to transport PCB board workpieces.

[0044] The board placement assembly 300 is connected to the main support 110. The board placement assembly 300 includes a board placement frame and a moving assembly. The moving assembly is slidably connected to the main support 110. The board placement frame includes a discharge board 311, a table beam 312, and a discharge connecting plate 313. The discharge board 311 is connected and fixed to the moving assembly. The table beam 312 is located at both ends of the discharge board 311 and is connected and fixed to the moving assembly. The discharge connecting plate 313 is connected to the end of the table beam 312 away from the discharge board 311. The wheel set 220 is located between the two table beams 312. The board placement frame is used to support vertically stacked PCB board workpieces.

[0045] Workers place vertically stacked PCB workpieces between the discharge plate 311 and the discharge connecting plate 313. The first lead screw assembly drives the roller assembly 220 to move upward, and after a PCB workpiece is caught, the roller assembly 220 transports it to the testing station. Then, the first lead screw assembly drives the roller assembly 220 to move downward, and the moving component drives the board placement frame to move, so that the next PCB workpiece corresponds and matches with the roller assembly 220. The roller assembly 220 then transports the next PCB workpiece out, completing the automatic feeding and transportation operation. Its structure is simple and its work efficiency is high.

[0046] like Figure 3 As shown, the wheel assembly 220 includes a lifting mounting plate 221, friction wheels 222, a synchronous belt 223, and a plate clamp drive pulley 224. The lifting mounting plate 221 is connected to the first lead screw assembly. Multiple friction wheels 222 and multiple plate clamp drive pulleys 224 are respectively located on both sides of the lifting mounting plate 221. Each friction wheel 222 and each plate clamp drive pulley 224 are correspondingly connected for transmission. Multiple plate clamp drive pulleys 224 are connected to each other through the synchronous belt 223. The first lead screw assembly drives the lifting mounting plate 221 to move up and down. Multiple friction wheels 222 are matched and correspond to PCB board workpieces. The plate clamp drive pulleys 224 are connected for transmission to the friction wheels 222. When the synchronous belt 223 moves, it drives the plate clamp drive pulleys 224 to move, which in turn drives the friction wheels 222 to rotate, so that multiple friction wheels 222 move synchronously, realizing the stable transportation of PCB board workpieces by the friction wheels 222.

[0047] like Figure 4As shown, the first lead screw assembly includes a lifting guide rod 211, a lifting guide sleeve seat 212, a guide rod upper end plate 213, a bearing seat 214, and a lifting lead screw 215. The bearing seat 214 is mounted on the auxiliary support 120, and lifting guide sleeve seats 212 are provided on both sides of the bearing seat 214. The lifting guide sleeve seats 212 are mounted on the auxiliary support 120. The lifting guide rod 211 is located in the lifting guide sleeve seat 212, and the lifting lead screw 215 is located in the bearing seat 214. The guide rod upper end plate 213 is connected and fixed to the upper ends of the lifting guide rod 211 and the lifting lead screw 215. The guide rod upper end plate 213 is connected to the upper end of the guide rod 211 and the upper end of the lifting lead screw 215. The wheel assembly consists of 220 pieces connected and fixed. The upper end plate 213 of the guide rod is connected to the lifting mounting plate 221. Two lifting guide rods 211 are located at both ends of the upper end plate 213 of the guide rod. The lifting screw 215 is located between the two lifting guide rods 211. The lifting screw 215 is located in the bearing seat 214. Rotation of the lifting screw 215 causes the entire first screw assembly to move up and down. The lifting guide rods 211 move up and down synchronously. The lifting guide rods 211 are located in the lifting guide sleeve seat 212 to make the up and down movement more stable and prevent deviation during the up and down movement. Its structure is simple, the movement is stable, and the error is reduced.

[0048] like Figure 4 , Figure 6 As shown, the main support 110 includes an upper support 111, a lower support 112, and a reinforcing plate 113. The upper support 111 and the lower support 112 are connected and fixed together by the reinforcing plate 113. The auxiliary support 120 is connected and fixed together with the lower support 112. The upper support 111 is provided with a first mounting plate 114, and the lower support 112 is provided with a second mounting plate 115. The first mounting plate 114 and the second mounting plate 115 are used to set slide rails so that the moving component can move along the first mounting plate 114 and the second mounting plate 115. The reinforcing plate 113 connects the upper support 111 and the lower support 112, making its overall structure more stable, realizing the stable movement of the board placement rack, and ensuring the stable transportation of PCB board workpieces.

[0049] like Figure 5 , Figure 6As shown, the moving assembly includes a first moving assembly and a second moving assembly. The first moving assembly includes a first slide rail 321, a second slide rail 322, a first slider 323, a second slider 324, a support plate 325, and a second lead screw assembly. The first slide rail 321 is mounted on the first mounting plate 114. The first slider 323 is connected to the upper end of the support plate 325 and is slidably connected to the first slide rail 321. The second slide rail 322 is mounted on the second mounting plate 115. The second slider 324 is connected to the lower end of the support plate 325 and is slidably connected to the second slide rail 322. The second lead screw assembly... The rod assembly is mounted on the second mounting plate 115, and the second lead screw assembly is located between the second slide rails 322. The second lead screw assembly is connected to the second slider 324. In this embodiment, the first slider 323 is matched and corresponds to the first slide rail 321, and the second slider 324 is matched and corresponds to the second slide rail 322. The support plate 325 is connected and fixed to the first slider 323 and the second slider 324. The support plate 325 is connected and fixed to the plate-laying frame. When the support plate 325 moves along the first slide rail 321 and the second slide rail 322, it drives the plate-laying frame to move. The second lead screw assembly drives the support plate 325 to move. The structure is simple and the transportation is stable.

[0050] like Figure 5 As shown, the second lead screw assembly includes a lead screw mounting base 331, a lead screw positioning base 332, and a translation lead screw 333. The translation lead screw 333 is disposed between the second slide rails 322. One end of the second slide rail 322 is provided with the lead screw mounting base 331, and the other end of the second slide rail 322 is provided with the lead screw positioning base 332. The translation lead screw 333 connects the lead screw mounting base 331 and the lead screw positioning base 332. The lead screw mounting base 331 and the lead screw positioning base 332 connect the translation lead screw 333, so that the translation lead screw 333 remains stable during rotation, thereby enabling the pallet 325 to move stably and ensuring the stable transportation of PCB board workpieces.

[0051] like Figure 2 As shown, the second moving component includes a vertical guide rod 326, a vertical lead screw 327, and a lifting connecting plate 328. The lifting connecting plate 328 connects two table beams 312 and is located below the discharge plate 311. The vertical guide rod 326 is located at both ends of the discharge plate 311, with its lower end connected to the lifting connecting plate 328. The vertical lead screw 327 connects the discharge plate 311 and the lifting connecting plate 328. Between two vertical guide rods 326, the vertical guide rods 326 and the vertical screw 327 connect the discharge plate 311 and the lifting connecting plate 328. The vertical screw 327 and the vertical guide rods 326 move up and down synchronously, causing the lifting connecting plate 328 and the discharge plate 311 to move up and down, thereby driving the entire plate-laying frame to move up and down, so that the height of the PCB board workpiece on the plate-laying frame is consistent with the height of the workpiece to be placed at the work station, so that the PCB board workpiece can be accurately transported to the work station to be placed.

[0052] like Figure 2 As shown, the board placement assembly 300 includes a photoelectric sensor bracket 340 and a positioning sensor plate 350. The photoelectric sensor bracket 340 is located on the outer side of the table crossbeam 312. When the board placement frame moves up and down to align with the workstation, the photoelectric sensor bracket 340 detects the specific height, enabling the moving component to accurately drive the board placement frame to the correct height, thus improving accuracy. The PCB board workpiece is transported to the testing host (not shown in the figure) for testing. The positioning sensor plate 350 is located on the left and right side entry and exit crossbeams of the testing host. The positioning sensor plate 350 is used to sense the PCB board workpiece. After the positioning sensor plate 350 senses the corresponding PCB board workpiece, the wheel assembly 220 starts to move, transporting the PCB board workpiece out, thus completing the accurate transport of the PCB board workpiece. In this embodiment, the photoelectric sensor bracket 340 and the positioning sensor plate 350 are located on the same side of the board placement frame.

[0053] like Figure 3 As shown, the wheel assembly 220 includes a sensing guide block 225, which is mounted on the lifting mounting plate 221. The sensing guide block 225 and the friction wheel 222 are mounted on the same horizontal straight line. The sensing guide block 225 is provided with a guide groove 226. The guide groove 226 on the sensing guide block 225 is used to guide the PCB board workpiece during the transportation of the wheel assembly 220, so as to prevent the PCB board workpiece from shifting its position during transportation and falling off.

[0054] In summary, those skilled in the art will readily understand that this application provides a PCB board loading and unloading transport device. Workers place vertically stacked PCB workpieces between the unloading plate 311 and the unloading connecting plate 313. The first lead screw assembly drives the roller assembly 220 upwards, catching a PCB workpiece. The roller assembly 220 then transports the workpiece to the testing station. The first lead screw assembly then drives the roller assembly 220 downwards, and the moving component moves the board placement frame, aligning the next PCB workpiece with the roller assembly 220. The roller assembly 220 then transports the next PCB workpiece, completing the automatic loading and unloading operation. Automatic unloading transport removes the PCB workpiece from the testing station, following the same principle as automatic loading transport. It has a simple structure and high efficiency.

[0055] The above embodiments of this application are merely illustrative examples to clearly illustrate the purpose of this application, and are not intended to limit the implementation of this application. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A PCB board loading and unloading conveying device, characterized in that, The PCB board loading and unloading conveying device includes: The frame (100) includes a main support (110) and a secondary support (120), wherein the main support (110) and the secondary support (120) are connected and fixed to each other; A wheel transport assembly (200) is connected to the sub-support (120). The wheel transport assembly (200) includes a first lead screw assembly and a wheel assembly (220). The first lead screw assembly connects the sub-support (120) and the wheel assembly (220). The wheel assembly (220) is used to transport PCB board workpieces. A board placement assembly (300) is connected to the main support (110). The board placement assembly (300) includes a board placement frame and a moving assembly. The moving assembly is slidably connected to the main support (110). The board placement frame includes a discharge board (311), a table beam (312), and a discharge connecting plate (313). The discharge board (311) is fixedly connected to the moving assembly. The table beam (312) is located at both ends of the discharge board (311) and is fixedly connected to the moving assembly. The discharge connecting plate (313) connects the end of the table beam (312) away from the discharge board (311). The wheel set (220) is located between the two table beams (312). The board placement frame is used to support vertically stacked PCB board workpieces. The first lead screw assembly includes a lifting guide rod (211), a lifting guide sleeve seat (212), a guide rod upper end plate (213), a bearing seat (214), and a lifting lead screw (215). The bearing seat (214) is mounted on the sub-support (120), and the lifting guide sleeve seat (212) is provided on both sides of the bearing seat (214). The lifting guide sleeve seat (212) is mounted on the sub-support (120), the lifting guide rod (211) is located in the lifting guide sleeve seat (212), and the lifting lead screw (215) is located in the bearing seat (214). The guide rod upper end plate (213) is connected and fixed to the upper ends of the lifting guide rod (211) and the lifting lead screw (215). The guide rod upper end plate (213) is connected and fixed to the wheel assembly (220). The main support (110) includes an upper support (111), a lower support (112), and a reinforcing plate (113). The upper support (111) and the lower support (112) are connected and fixed together by the reinforcing plate (113). The auxiliary support (120) is connected and fixed together with the lower support (112). The upper support (111) is provided with a first mounting plate (114), and the lower support (112) is provided with a second mounting plate (115). The moving component includes a first moving component and a second moving component. The first moving component includes a first slide rail (321), a second slide rail (322), a first slider (323), a second slider (324), a support plate (325), and a second lead screw assembly. The first slide rail (321) is disposed on the first mounting plate (114). The first slider (323) is connected to the upper end of the support plate (325) and is slidably connected to the first slide rail (321). The second slide rail (322) is disposed on the second mounting plate (115). The second slider (324) is connected to the lower end of the support plate (325) and is slidably connected to the second slide rail (322). The second lead screw assembly is disposed on the second mounting plate (115) and between the second slide rails (322). The second lead screw assembly is connected to the second slider (324). The second moving component includes a vertical guide rod (326), a vertical screw rod (327), and a lifting connecting plate (328). The lifting connecting plate (328) connects the two table beams (312) and is located below the discharge plate (311). The vertical guide rod (326) is located at both ends of the discharge plate (311), and the lower end of the vertical guide rod (326) is connected to the lifting connecting plate (328). The vertical screw rod (327) connects the discharge plate (311) and the lifting connecting plate (328) and is located between the two vertical guide rods (326).

2. The PCB board loading and unloading conveying device according to claim 1, characterized in that, The wheel assembly (220) includes a lifting mounting plate (221), friction wheels (222), a synchronous belt (223), and a plate clamp drive pulley (224). The lifting mounting plate (221) is connected to the first lead screw assembly. Multiple friction wheels (222) and multiple plate clamp drive pulleys (224) are respectively located on both sides of the lifting mounting plate (221). Each friction wheel (222) and each plate clamp drive pulley (224) are correspondingly connected for transmission. Multiple plate clamp drive pulleys (224) are connected to each other through the synchronous belt (223).

3. The PCB board loading and unloading conveying device according to claim 1, characterized in that, The second lead screw assembly includes a lead screw mounting seat (331), a lead screw positioning seat (332), and a translation lead screw (333). The translation lead screw (333) is disposed between the second slide rails (322). One end of the second slide rail (322) is provided with the lead screw mounting seat (331), and the other end of the second slide rail (322) is provided with the lead screw positioning seat (332). The translation lead screw (333) connects the lead screw mounting seat (331) and the lead screw positioning seat (332).

4. The PCB board loading and unloading conveying device according to claim 1, characterized in that, The plate-laying assembly (300) includes a photoelectric sensor bracket (340), which is located on the outer side of the table beam (312).

5. The PCB board loading and unloading conveying device according to claim 1, characterized in that, The board placement assembly (300) includes a position sensing plate (350). The PCB board workpiece is transported to the test host for testing. The position sensing plate (350) is located on the left and right side entry and exit crossbeams of the test host. The position sensing plate (350) is used to sense the PCB board workpiece.

6. The PCB board loading and unloading conveying device according to claim 2, characterized in that, The wheel assembly (220) includes a sensing guide block (225), which is located on the lifting mounting plate (221). The sensing guide block (225) and the friction wheel (222) are located on the same horizontal straight line. The sensing guide block (225) is provided with a guide groove (226).

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