PCB chip mounter and chip mounting method

Abstract

The invention discloses a PCB chip mounter, and belongs to the technical field of surface mounting. A PCB chip mounter comprises a platform and a conveying part arranged on the platform, and further comprises a limiting assembly used for fixing a PCB, the limiting assembly comprises an adsorption part and a clamping part, the adsorption part is fixedly installed on the upper surface of the platform, and the clamping part is fixedly connected to the lower surface of the platform; the floating shaft is used for detecting the accuracy of a PCB station, one end of the floating shaft is in transmission connection with a servo motor through an electromagnetic clutch, and the floating wheel is rotationally installed on the platform; a photoelectric sensor is used for monitoring the position and area of a PCB, the actual use number of suction cups is controlled, stable adsorption of the suction cups and the PCB is guaranteed, the PCB is clamped through clamping rods, limiting blocks are attached to the two sides of the PCB, then the PCB is pressed, the PCB is prevented from deviating in the surface mounting process, a box body and an air outlet box are arranged, and the surface mounting efficiency of the PCB is improved. And air is blown to the PCB through the air pipe and the air outlet box before entering the next process, so that dust and impurities on the surface of the PCB are removed.

Description

Technical Field

[0001] This invention relates to the field of surface mount technology, and more particularly to a PCB board pick and place machine and a pick and place method. Background Technology

[0002] Surface mount technology (SMT) is currently the most popular technology and process in the electronics assembly industry. It's a circuit assembly technology that mounts leadless or short-lead surface mount components onto the surface of a printed circuit board (PCB) or other substrate, and then solders them using methods such as reflow soldering or dip soldering. A pick-and-place machine is a device used to achieve high-speed, high-precision component placement. The pick-and-place machine precisely places surface mount components onto the PCB by moving the placement head. The performance and speed of the pick-and-place machine directly determine the production efficiency, capacity, and product performance of the entire SMT production line. The PCB conveyor mechanism feeds the PCB into the pick-and-place machine and positions it below the machine so that the placement head can place the components onto the PCB.

[0003] However, in the existing technology, the placement machine is prone to uneven placement of PCB boards during operation. The placement operation may be offset, resulting in inaccurate placement position and reduced PCB board production quality. Summary of the Invention

[0004] The purpose of this invention is to solve the problem that existing vibration monitoring devices can only monitor the vibration of drive shafts under no-load conditions and cannot fully obtain vibration data of drive shafts under actual use conditions, resulting in limited monitoring data. Therefore, this invention proposes a PCB board placement machine and placement method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A PCB board placement machine includes a platform and a conveying unit disposed on the platform, and further includes: a limiting component for fixing the PCB board, the limiting component including an adsorption part and a clamping part, the adsorption part being fixedly installed on the upper surface of the platform, and the clamping part being fixedly connected to the lower surface of the platform; a floating shaft for detecting the accuracy of the PCB board station, one end of the floating shaft being driven by a servo motor through an electromagnetic clutch, and the floating shaft being rotatably mounted on the platform.

[0007] Preferably, the conveying unit includes a conveying shaft and conveying wheels fixedly mounted on the surface of the conveying shaft. Supports are fixedly mounted on both sides of the platform, and both ends of the conveying shaft are rotatably mounted on the supports via bearing seats.

[0008] To ensure that the motor drives multiple sets of conveyor shafts to operate synchronously, a synchronous pulley is fixedly installed at one end of each conveyor shaft, and two adjacent sets of synchronous pulleys are connected by a synchronous belt drive. One end of one set of conveyor shafts is connected to a motor.

[0009] Preferably, the adsorption unit includes a first cylinder and a suction cup connected to the telescopic rod end of the first cylinder. The first cylinder is fixedly installed on the platform, and a through hole is opened in the platform. A photoelectric sensor is fixedly installed in the through hole.

[0010] Preferably, the clamping part includes a third cylinder, which is configured as a dual-axis cylinder, and the telescopic rod ends on both sides of the third cylinder are pinned to connecting rods. One end of the connecting rod is pinned to a clamping rod, and one end of the clamping rod is provided with a limit block.

[0011] To minimize the length of the connecting rod and to avoid interference between the clamping rod and the platform, the platform is further provided with symmetrical slots on both sides, and positioning blocks are symmetrically arranged on one side of each slot. The clamping rod is pinned between the two sets of positioning blocks.

[0012] Preferably, a floating wheel is fixedly installed on the surface of the floating shaft, and two sets of floating frames are slidably arranged on both sides of the platform. Both ends of the floating wheel are rotatably connected to the floating frame through bearing seats. Two sets of support plates are symmetrically installed on both sides of the platform. A guide groove is opened in the support plate, and one side of the floating frame is slidably installed in the guide groove.

[0013] Preferably, a box is fixedly installed on the bracket, and an air outlet box is connected to the box via an air pipe. The air outlet box is fixedly installed on one side of the bracket, and an air outlet hole is connected to one side of the air outlet box.

[0014] To reduce the need for additional drive structures within the equipment, a gear is fixedly mounted on one end of the motor, two sets of guide bars are symmetrically arranged on the housing, a rack is slidably mounted between the guide bars, a push rod is fixedly connected to the bottom of the rack, one end of the push rod extends through the housing and into the housing, and a piston plate is fixedly connected to one end of the housing, the piston plate being slidably mounted within the housing.

[0015] A patch mounting method includes the following steps:

[0016] Step 1: Place the PCB board on the conveyor rollers, start the motor to drive the conveyor shaft to rotate, and use the friction between the conveyor rollers and the PCB board to move the PCB board to the placement station. After monitoring by the photoelectric sensor, the data is transmitted to the PLC control system and recorded.

[0017] Step 2: Start the external air pump connected to the first cylinder and suction cup to suction the PCB board. At the same time, start the third cylinder. The extension rod of the third cylinder drives the connecting rod to extend to both sides. Since the clamping rod is pinned to one end of the connecting rod and the clamping rod is pinned to the platform, the third cylinder controls the two sets of clamping rods to swing towards the center of the platform to limit the PCB board and prevent the PCB board from shifting during the placement process.

[0018] Step 3: The photoelectric sensor monitors the PCB board's workstation. During the placement process, after the PCB board is displaced, the photoelectric sensor sends a signal to the PLC. The PLC controls the second cylinder to move the floating frame upward. Then, it controls the servo motor and electromagnetic clutch to rotate the floating shaft. The floating wheel drives the PCB board to move to the workstation data recorded in Step 1, further ensuring the accuracy of the PCB board's placement position.

[0019] Step 4: After the surface mount technology (SMT) is completed, the motor is started to drive the conveyor wheel to rotate and transport the PCB board to the next process. During the transport process, the rack and pinion drive the push rod to push the piston plate in the box and blow air into the PCB board through the air outlet box to remove dust and impurities from the PCB board before it enters the next process.

[0020] Compared with the prior art, the present invention provides a PCB board placement machine, which has the following beneficial effects:

[0021] 1. This PCB board placement machine uses multiple sets of first cylinders and suction cups on the platform to adsorb PCB boards. It uses photoelectric sensors to monitor the size and position of the PCB boards, controls the actual number of suction cups used, and ensures stable adsorption between the suction cups and the PCB boards.

[0022] 2. This PCB board placement machine has two sets of third cylinders set below the platform. The two ends of the third cylinders are pinned to the connecting rods, which are pinned to the clamping rods. The clamping rods are controlled to clamp the PCB board. After the limit block is attached to both sides of the PCB board, it is pressed to prevent the PCB board from shifting during the placement process.

[0023] 3. This PCB board placement machine is equipped with a floating shaft 1 and a floating wheel 2. The servo motor 14 and photoelectric sensor 23 at one end of the floating shaft 1 are electrically connected. During the placement process, if the PCB board shifts due to the placement process, the photoelectric sensor 23 sends a signal to the PLC, which starts the second cylinder 13 to drive the floating frame 12 to move upward. Then, the servo motor 14 and electromagnetic clutch 15 are controlled to drive the floating shaft 1 to rotate. The rotation of the floating wheel 2 drives the PCB board to reset, further ensuring the accuracy of the PCB board placement position.

[0024] 4. This PCB board placement machine has a housing with a piston plate inside. The piston plate is connected to a push rod, which is connected to a rack. During the rotation of the motor, the rack is driven by the gear to move the push rod and the piston plate, thereby blowing air onto the PCB board through the air pipe and the air outlet box to remove dust and impurities from its surface.

[0025] The parts not described in this device are the same as or can be implemented using existing technologies. This invention uses photoelectric sensors to monitor the PCB board, monitor the size and position of the PCB board, control the actual number of suction cups used, and ensure the adsorption stability between the suction cups and the PCB board. The PCB board is clamped using clamping rods. After the limiting block and both sides of the PCB board are attached, it is pressed to prevent the PCB board from shifting during the mounting process. A box and an air outlet are set up. Before entering the next process, the PCB board is blown with air through the air pipe and the air outlet to remove dust and impurities from its surface. Attached Figure Description

[0026] Figure 1 This is a front-view three-dimensional structural diagram of a PCB board placement machine proposed in this invention;

[0027] Figure 2 This is a bottom-view three-dimensional structural diagram of a PCB board pick and place machine proposed in this invention;

[0028] Figure 3 This invention proposes a PCB board pick and place machine. Figure 2 Enlarged structural diagram of section B;

[0029] Figure 4 This is a three-dimensional schematic diagram of a floating shaft drive structure for a PCB board pick and place machine proposed in this invention;

[0030] Figure 5 This invention proposes a PCB board pick and place machine. Figure 1 Enlarged structural diagram of section A;

[0031] Figure 6 This is a three-dimensional structural diagram of the conveyor section of a PCB board placement machine proposed in this invention;

[0032] Figure 7 This is a partial cross-sectional view of the housing structure of a PCB board placement machine proposed in this invention.

[0033] In the diagram: 1. Floating shaft; 2. Floating wheel; 3. Platform; 4. First cylinder; 5. Suction cup; 6. Conveyor shaft; 7. Conveyor wheel; 8. Motor; 9. Synchronous pulley; 10. Synchronous belt; 11. Support; 12. Floating frame; 13. Second cylinder; 14. Servo motor; 15. Electromagnetic clutch; 16. Third cylinder; 17. Connecting rod; 18. Clamping rod; 19. Limiting block; 20. Groove; 21. Positioning block; 22. Through hole; 23. Photoelectric sensor; 24. Support plate; 25. Guide groove; 26. Rack; 27. Gear; 28. Push rod; 29. ​​Piston plate; 30. Housing; 31. Air pipe; 32. Air outlet box; 33. Air outlet. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0035] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Example:

[0037] Reference Figures 1-7 A PCB board placement machine includes a platform 3 and a conveying unit disposed on the platform 3. The conveying unit includes a conveying shaft 6 and conveying wheels 7 fixedly mounted on the surface of the conveying shaft 6. Supports 11 are fixedly mounted on both sides of the platform 3. Both ends of the conveying shaft 6 are rotatably mounted on the supports 11 via bearing seats. A synchronous pulley 9 is fixedly mounted on one end of the conveying shaft 6. Two adjacent sets of synchronous pulleys 9 are connected by a synchronous belt 10. One set of conveying shaft 6 is connected to a motor 8.

[0038] In this embodiment, a conveyor unit is provided to drive the PCB board from the previous process to the surface mount process. After the surface mount process is completed, the PCB board is then conveyed to the next process. Specifically, the start motor 8 drives the synchronous pulley 9 at the output shaft end, which in turn drives the synchronous pulley 9 at the shaft end of the conveyor shaft 6 through the synchronous belt 10. At the same time, the conveyor shaft 6 on the surface of the platform 3 rotates. The friction between the conveyor wheel 7 and the PCB board is used to move the PCB board on the platform 3.

[0039] The device also includes a limiting component for fixing the PCB board. The limiting component includes an adsorption part and a clamping part. The adsorption part is fixedly installed on the upper surface of the platform 3, and the clamping part is fixedly connected to the lower surface of the platform 3.

[0040] In this embodiment, both an adsorption part and a clamping part are provided to limit the PCB board, effectively preventing the PCB board from shifting during the placement process, which would affect the accuracy of the placement position and ensure the production quality of the PCB board.

[0041] The adsorption unit includes a first cylinder 4 and a suction cup 5 connected to the telescopic rod end of the first cylinder 4. The first cylinder 4 is fixedly installed on the platform 3. A through hole 22 is opened in the platform 3, and a photoelectric sensor 23 is fixedly installed in the through hole 22.

[0042] By setting two sets of third cylinders 16 below platform 3, the two ends of the third cylinder 16 are pinned to connecting rods 17, and the connecting rods 17 and clamping rods 18 are pinned to control the clamping rods 18 to clamp the PCB board. After the limiting block 19 is attached to both sides of the PCB board, it is pressed to prevent the PCB board from shifting during the mounting process.

[0043] The clamping part includes a third cylinder 16, which is a dual-axis cylinder with the model number CXSM25-70X. Both sides of the telescopic rod end of the third cylinder 16 are pinned to the connecting rod 17. One end of the connecting rod 17 is pinned to the clamping rod 18, and one end of the clamping rod 18 is provided with a limit block 19.

[0044] Specifically, the third cylinder 16 is activated, which drives the connecting rod 17 to extend to both sides. During the extension process, the connecting rod 17 drives the clamping rod 18 to rotate around the center of the positioning block 21, thereby driving the clamping rod 18 to move closer to the PCB board. After the limit block 19 contacts the PCB board, the clamping is completed.

[0045] It should be noted that the output shaft end of the third cylinder 16 is pinned to the connecting rod 17, the connecting rod 17 is pinned to the clamping rod 18, and the clamping rod 18 is pinned to the platform 3, thereby eliminating the clamping dead angle and avoiding mutual interference of structural components during clamping.

[0046] The platform 3 has symmetrical slots 20 on both sides, and positioning blocks 21 are symmetrically arranged on one side of the slots 20. The clamping rod 18 is pinned between the two sets of positioning blocks 21.

[0047] In this embodiment, slots 20 are provided on both sides of the platform 3. During the flipping process, the clamping rod 18 swings within the slots 20, which not only shortens the length of the connecting rod 17 as much as possible, but also avoids interference between the flipping of the clamping rod 18 and the platform 3.

[0048] A floating shaft 1 is used to inspect the accuracy of the PCB board workstation. One end of the floating shaft 1 is connected to a servo motor 14 via an electromagnetic clutch 15. A floating wheel 2 is rotatably mounted on a platform 3. The floating wheel 2 is fixedly mounted on the surface of the floating shaft 1. Two sets of floating frames 12 are slidably arranged on both sides of the platform 3. Both ends of the floating wheel 2 are rotatably connected to the floating frame 12 via bearing seats. Two sets of support plates 24 are symmetrically installed on both sides of the platform 3. The support plates 24 have guide grooves 25. One side of the floating frame 12 is slidably mounted in the guide groove 25.

[0049] In this embodiment, a photoelectric sensor 23 is installed in the platform 3. The photoelectric sensor 23 can monitor the PCB board's workstation in real time. During the placement process, if the PCB board is displaced due to the placement process, the photoelectric sensor 23 can send a signal to the PLC. The PLC controls the second cylinder 13 to move, which drives the floating frame 12 to move upward. Then, it controls the servo motor 14 and the electromagnetic clutch 15 to drive the floating shaft 1 to rotate. The floating wheel 2 is used to drive the PCB board to move to the workstation data recorded in step one, further ensuring the accuracy of the PCB board placement position.

[0050] A housing 30 is fixedly installed on the bracket 11. An air outlet box 32 is connected to the housing 30 through an air pipe 31. The air outlet box 32 is fixedly installed on one side of the bracket 11, and an air outlet 33 is connected to one side of the air outlet box 32.

[0051] In this embodiment, a housing 30 is provided. The piston plate inside the housing 30 blows air onto the PCB board through the air outlet 32 ​​to remove dust and impurities from the PCB board before it enters the next process.

[0052] A gear 27 is fixedly installed at one end of the motor 8. Two sets of guide bars are symmetrically arranged on the housing 30. A rack 26 is slidably installed between the guide bars. A push rod 28 is fixedly connected to the bottom of the rack 26. One end of the push rod 28 passes through the housing 30 and extends into the housing 30. A piston plate 29 is fixedly connected to one end of the housing 30. The piston plate 29 is slidably installed inside the housing 30.

[0053] Specifically, after the surface mount technology (SMT) is completed, the starter motor 8 drives the conveyor wheel 7 to rotate and transport the PCB board to the next process. During the transport process, the rack 26 drives the gear 27 to drive the push rod 28 to push the piston plate in the housing 30. Air is blown onto the PCB board through the air outlet 32 ​​to remove dust and impurities from the PCB board before it enters the next process.

[0054] It should be noted that the conveyor shaft 6 moves the piston rod to the initial position by rotating in the opposite direction. In order to prevent dust from being sucked in when the air pipe 31 is drawing in air, a dustproof net is provided in the air outlet 33.

[0055] In addition, to ensure sufficient airflow impact force when cleaning dust and impurities, a pressure booster valve is installed in the air outlet 33. The model can be VBA10A-F02. The pressure booster valve is equipped with a pressure regulator, which can adjust the pressure of the drive chamber through the handle and outlet pressure feedback, thereby setting the outlet pressure and ensuring the cleaning effect.

[0056] In this invention, the PCB board is placed on the conveyor wheel 7 and driven by the conveyor unit from the previous process to the surface mount process. After the surface mount is completed, it is then conveyed to the next process.

[0057] Specifically, the starter motor 8 drives the synchronous pulley 9 at the output shaft end, which in turn drives the synchronous pulley 9 at the shaft end of the conveyor shaft 6 through the synchronous belt 10. At the same time, it drives the conveyor shaft 6 on the surface of the platform 3 to rotate. Using the friction between the conveyor wheel 7 and the PCB board, the PCB board is moved to the chip mounting station. The photoelectric sensor 23 monitors the position and area of ​​the PCB board and transmits the data to the PLC control system, which then records it.

[0058] Based on the monitoring data of the photoelectric sensor 23, the first cylinder 4 is activated according to the area of ​​the PCB board, and the specific number of first cylinders 4 used is determined to avoid complete contact between the suction cup 5 and the PCB board. Specifically, the external air pump connected to the first cylinder 4 and the suction cup 5 is activated to suction the PCB board, thereby achieving tight adsorption of the PCB board and preventing displacement of the PCB board during the mounting process.

[0059] At the same time, the third cylinder 16 is activated. The telescopic rod of the third cylinder 16 drives the connecting rod 17 to extend to both sides. Since the clamping rod 18 is pinned to one end of the connecting rod 17, and since the clamping rod 18 is pinned to the platform 3, the third cylinder 16 controls the two sets of clamping rods 18 to swing towards the center of the platform 3 to limit the PCB board and prevent the PCB board from shifting during the placement process.

[0060] The photoelectric sensor 23 monitors the PCB board's workstation. During the placement process, after the PCB board is displaced, the photoelectric sensor 23 sends a signal to the PLC. The PLC controls the second cylinder 13 to move, which drives the floating frame 12 upward. Then, it controls the servo motor 14 and the electromagnetic clutch 15 to rotate the floating shaft 1. The floating wheel 2 is used to move the PCB board to the workstation data recorded in step one, further ensuring the accuracy of the PCB board placement position.

[0061] After the surface mount technology (SMT) is completed, the starter motor 8 drives the conveyor wheel 7 to rotate and transport the PCB board to the next process. During the transport process, the rack 26 drives the gear 27 to drive the push rod 28 to push the piston plate in the housing 30. Air is blown onto the PCB board through the air outlet 32 ​​to remove dust and impurities from the PCB board before it enters the next process.

[0062] The present invention also discloses a patch application method, comprising the following steps:

[0063] Step 1: Place the PCB board on the conveyor wheel 7, start the motor 8 to drive the conveyor shaft 6 to rotate, and use the friction between the conveyor wheel 7 and the PCB board to move the PCB board to the chip mounting station. After monitoring by the photoelectric sensor 23, the data is transmitted to the PLC control system and recorded.

[0064] Step 2: Start the external air pump connected to the first cylinder 4 and suction cup 5 to suction the PCB board. At the same time, start the third cylinder 16. The extension rod of the third cylinder 16 drives the connecting rod 17 to extend to both sides. Since the clamping rod 18 is pinned to one end of the connecting rod 17 and the clamping rod 18 is pinned to the platform 3, the third cylinder 16 controls the two sets of clamping rods 18 to swing towards the center of the platform 3 to limit the PCB board and prevent the PCB board from shifting during the placement process.

[0065] Step 3: The photoelectric sensor 23 monitors the PCB board's workstation. During the placement process, after the PCB board is displaced, the photoelectric sensor 23 sends a signal to the PLC. The PLC controls the second cylinder 13 to move, which drives the floating frame 12 upward. Then, it controls the servo motor 14 and the electromagnetic clutch 15 to rotate the floating shaft 1. The floating wheel 2 is used to move the PCB board to the workstation data recorded in Step 1, further ensuring the accuracy of the PCB board placement position.

[0066] Step 4: After the surface mount is completed, start motor 8 drives conveyor wheel 7 to rotate and transport the PCB board to the next process. During the transport process, rack 26 drives gear 27 to drive push rod 28 to push piston plate in the housing 30. Air is blown onto the PCB board through air box 32 to remove dust and impurities on the PCB board before it enters the next process.

[0067] It should be noted that the PLC control system is a conventional control system in the mechanical field, and is well known to those skilled in the art, so it will not be described in detail.

[0068] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A PCB mounting machine, comprising a platform (3) and a conveying unit arranged on the platform (3), characterized in that: Also includes: A limit assembly for fixing the PCB board, the limit assembly comprising an adsorption portion and a clamping portion, the adsorption portion being fixedly mounted on the upper surface of the platform (3), and the clamping portion being fixedly connected to the lower surface of the platform (3); A floating shaft (1) is used to detect the accuracy of a PCB board position. One end of the floating shaft (1) is connected to a servo motor (14) via an electromagnetic clutch (15). The floating wheel (2) is rotatably mounted on a platform (3).

2. A PCB board mounter according to claim 1, characterized in that: The conveying part comprises a conveying shaft (6) and a conveying wheel (7) fixedly mounted on the surface of the conveying shaft (6); brackets (11) are fixedly mounted on both sides of the platform (3); and both ends of the conveying shaft (6) are rotatably mounted on the brackets (11) via bearing seats.

3. A PCB board mounter according to claim 2, characterized in that: A synchronous pulley (9) is fixedly mounted on one end of the conveying shaft (6), and two adjacent groups of synchronous pulleys (9) are connected in transmission via a synchronous belt (10), wherein one end of one group of the conveying shafts (6) is connected in transmission to a motor (8).

4. A PCB board mounter according to claim 1, characterized in that: The adsorption part comprises a first cylinder (4) and a suction cup (5) connected to the end of a telescopic rod of the first cylinder (4); the first cylinder (4) is fixedly mounted on a platform (3); a through hole (22) is provided in the platform (3); and a photoelectric sensor (23) is fixedly mounted in the through hole (22).

5. A PCB board mounter according to claim 1, characterized in that: The clamping part comprises a third cylinder (16), the third cylinder (16) is arranged as a double-axis cylinder, and the ends of the telescopic rods on both sides of the third cylinder (16) are pin-connected with connecting rods (17), one end of the connecting rod (17) is pin-connected with a clamping rod (18), and one end of the clamping rod (18) is provided with a limiting block (19).

6. A PCB board mounter according to claim 5, characterized in that: The platform (3) is symmetrically provided with slots (20) on both sides, and a positioning block (21) is symmetrically provided on one side of the slot (20), and the clamping rod (18) is pin-connected between the two groups of positioning blocks (21).

7. A PCB mounting machine according to claim 1, characterized in that: A floating wheel (2) is fixedly mounted on the surface of the floating shaft (1); two groups of floating frames (12) are slidably mounted on both sides of the platform (3); both ends of the floating wheel (2) are rotatably connected to the floating frames (12) via bearing seats; two groups of support plates (24) are symmetrically mounted on both sides of the platform (3); a guide groove (25) is provided in the support plate (24); and one side of the floating frame (12) is slidably mounted in the guide groove (25).

8. A PCB mounting machine according to claim 1, characterized in that: A box body (30) is fixedly mounted on the support (11), and an air outlet box (32) is connected to the box body (30) via an air pipe (31). The air outlet box (32) is fixedly mounted on one side of the support (11), and an air outlet hole (33) is connected to one side of the air outlet box (32).

9. A PCB mounting machine according to claim 8, characterized in that: A gear (27) is fixedly mounted on one end of the motor (8); two groups of guide bars are symmetrically arranged on the box body (30); a rack (26) is slidably mounted between the guide bars; a push rod (28) is fixedly connected to the bottom of the rack (26); one end of the push rod (28) passes through the box body (30) and extends into the box body (30); and a piston plate (29) is fixedly connected to one end of the box body (30); and the piston plate (29) is slidably mounted in the box body (30).

10. A chip placement method, comprising a PCB board chip placement machine according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: Place the PCB board on the conveying wheel (7), start the motor (8) to drive the conveying shaft (6) to rotate, use the friction between the conveying wheel (7) and the PCB board to drive the PCB board to move to the patch station, use the photoelectric sensor (23) to monitor and transmit to the PLC control system, and record; Step 2: Start the external air pump connected to the first cylinder (4) and the suction cup (5) to suck the PCB board, and start the third cylinder (16) at the same time. The telescopic rod of the third cylinder (16) drives the connecting rod (17) to extend to both sides. Since the clamping rod (18) is pin-connected to one end of the connecting rod (17), and since the clamping rod (18) and the platform (3) are pin-connected, the third cylinder (16) controls the two groups of clamping rods (18) to swing toward the center of the platform (3) to limit the PCB board, thereby preventing the PCB board from being displaced during the patch process. Step 3: The photoelectric sensor (23) monitors the working position of the PCB board. During the patch process, after the PCB board is displaced, the photoelectric sensor (23) sends a signal to the PLC. The PLC controls the second cylinder (13) to function, starts the second cylinder (13) to drive the floating frame (12) to move upward, and then controls the servo motor (14) and the electromagnetic clutch (15) to drive the floating shaft (1) to rotate, and uses the floating wheel (2) to drive the PCB board to move to the working position data recorded in step 1, thereby further ensuring the accuracy of the patch position of the PCB board; Step 4: After the patch is completed, the motor (8) is started to drive the conveying wheel (7) to rotate and convey the PCB board to the next process. During the conveying process, the rack (26) drives the gear (27) to drive the push rod (28) to push the piston plate in the box (30) to blow air to the PCB board through the air outlet box (32), so as to remove dust and impurities on the PCB board before entering the next process.

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