Board surface cleaning system for PCB production and processing and cleaning method thereof

Abstract

The invention belongs to the field of circuit board cleaning equipment, and provides a board surface cleaning system for PCB production and processing and a cleaning method thereof.The board surface cleaning system is characterized in that concave holes are formed in the tops of two opposite side plates of the cleaning box, positioning wheels are arranged in the concave holes, and a through lifting rotating shaft is arranged in the center of each positioning wheel; positioning plates are arranged on the opposite surfaces of the two lifting rotating shafts, positioning assemblies are arranged on the positioning plates, and the positioning assemblies are used for fixing a circuit board; a lifting gear is arranged on the lifting rotating shaft and on the outer side of the cleaning box body, a lifting turnover assembly is arranged on the lifting gear, and the lifting turnover assembly drives the circuit board to achieve lifting turnover in the cleaning box body; through the cleaning mechanism, the circuit board is cleaned at intervals, the cleaning state of the circuit board can be observed conveniently in the cleaning process, and the situation that the cleaning time is too long is avoided.

Description

Technical Field

[0001] The invention belongs to the field of circuit board cleaning equipment, in particular to a board surface cleaning system and a cleaning method for PCB circuit board production and processing. Background Art

[0002] PCB, or printed circuit board, is a board that forms electrical connections between electronic components by laying conductive copper foil patterned on the surface of insulating materials (such as glass fiber, epoxy resin, etc.). It is the provider of electrical connections for electronic components, the brain and heart of electronic products, and is widely used in various electronic devices. Therefore, whether it is simple household appliances, complex smart devices, or industrial control systems, they cannot do without the support of PCB boards.

[0003] The manufacturing process of PCB is complicated. Taking the four-layer printed circuit board as an example, its manufacturing process mainly includes PCB layout, core board production, inner PCB layout transfer, core board punching and inspection, lamination, drilling, copper chemical precipitation of hole wall, outer PCB layout transfer and outer PCB etching.

[0004] Therefore, electric welding is required during the production of PCB boards. During the welding process, chemical substances such as flux will remain on the surface of the PCB boards. If these residues are not removed in time, they may cause corrosion to electronic devices, printed transmission lines and spot welding, thereby reducing the performance and stability of the PCB boards. Therefore, cleaning is an important step to ensure the stability of electronic products and the index values ​​of electrical equipment.

[0005] Among the existing cleaning methods, the most common way is for workers to place the processed PCB circuit boards in a machine with a cleaning agent for cleaning. However, during the cleaning process, it is impossible to accurately know the degree of cleaning of the PCB electrical board. If the cleaning time is too long, it may cause the board surface to turn white or damage the electrical components thereon. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a board surface cleaning system and a cleaning method for PCB circuit board production and processing, so as to solve the problem in the prior art that during the cleaning process of the PCB circuit board, the cleaning condition cannot be well known, resulting in the cleaning time being too long and causing damage to the circuit board.

[0007] A board surface cleaning system and a cleaning method for PCB circuit board production and processing, comprising a cleaning box, two opposite side plates of the cleaning box are provided with concave holes on the top, a positioning wheel is provided in the concave holes, a lifting shaft is provided through the center of the positioning wheel, and a positioning plate is provided on the opposite sides of the two lifting shafts, and a positioning assembly is provided on the positioning plate, and the positioning assembly is used to fix the circuit board;

[0008] A lifting gear is provided on the lifting shaft and on the outside of the cleaning box, a placement plate is provided under the cleaning box, and a lifting and flipping assembly is provided on the placement plate. The lifting and flipping assembly drives the circuit board to be lifted and flipped in the cleaning box by driving the lifting shaft.

[0009] Preferably, the vertical section of the concave hole is "U"-shaped, and the two concave holes are arranged relatively to each other, the positioning wheel is movably inserted into the concave hole, and the lifting shaft is fixedly connected to the positioning wheel.

[0010] Preferably, the positioning assembly includes an insertion rod, a side plate, a positioning block and a rubber block, the side wall of the positioning plate is symmetrically provided with through holes distributed up and down, the vertical section of the side plate is "L"-shaped, and the insertion rod is symmetrically distributed on the side plate.

[0011] Preferably, the other end of the insertion rod extends to the through hole and is movably arranged, and the two side panels and the positioning plate together form a "concave" shape, and the positioning blocks are symmetrically distributed up and down on one side of the positioning plate close to the circuit board and on the opposite surfaces of the two side panels, and the number of the positioning blocks on the positioning plate is not less than two, the rubber block is located between the upper and lower positioning blocks, and the circuit board is inserted into the rubber block.

[0012] Preferably, the top and bottom of the positioning plate are provided with spaced-apart latching pins, and the side plates are provided with elastic pull ropes above and below the insertion rod, and the other ends of the elastic pull ropes are connected with rubber sleeves, and when the side plates are fixed to the circuit board, the rubber sleeves are inserted into the latching pins.

[0013] Preferably, support plates are provided on the four corners of the bottom of the cleaning box, the placement plate is connected between two of the support plates, and heating rods with an external power supply are symmetrically provided inside the cleaning box and near the bottom.

[0014] Preferably, an air supply machine is provided on the top of the placement plate, an exhaust plate is provided on the top of the bottom plate of the cleaning box, the exhaust plate is provided with air outlet holes distributed at intervals, and an air supply pipe connected to the air outlet holes and the air supply machine is provided.

[0015] Preferably, the number of gear teeth on the lifting gear is one-half of the entire gear disk, and the lifting and flipping assembly includes a power gear, a motor, a positioning clamp and a lifting cylinder. The power gear is at the bottom of the lifting gear and the two cooperate with each other. A vertical plate is provided on one side of the power gear, and the motor is installed on the vertical plate. The output shaft of the motor passes through the vertical plate and is connected to the power gear.

[0016] Preferably, the positioning clamp is connected to one end of the lifting shaft extending out of the cleaning box body, the positioning clamp is rotatably connected on the lifting shaft, the lifting cylinder is fixedly connected to the top of the placement plate, and the cylinder rod of the lifting cylinder is fixedly connected to the outer wall of the positioning clamp, and when the gear teeth on the lifting gear are engaged with the power gear, the lifting shaft no longer rotates.

[0017] A method for using a board surface cleaning system for PCB circuit board production and processing comprises the following specific steps:

[0018] S1: There is a positioning assembly on the positioning plate inside the cleaning box. The circuit board is placed in the cleaning box so that the two sides of the circuit board are inserted into the rubber blocks on the positioning plate. The side plates on both sides are moved so that the rubber blocks on the side plates fix the other two sides of the circuit board. The rubber sleeves on the side plates connected by the elastic pull ropes are inserted into the bayonet pins to fix the circuit board.

[0019] A specific cleaning agent is put into the cleaning box so as to submerge the circuit board.

[0020] S2: Start the motor, the output shaft of the motor is connected to the power gear, the power gear cooperates with the lifting gear, so as to drive the lifting gear to rotate, and drive the circuit board to rotate in the cleaning box through the lifting shaft for cleaning.

[0021] S3: At the same time, the air supply machine is started, and the air supply machine conveys gas into the exhaust plate through the air supply pipe, and the gas emerges through the air outlet, thereby forming bubbles in the cleaning agent. The bubbles can not only make the cleaning agent in the cleaning box tumble, but also burst after contacting the circuit board, and the impurities attached to the circuit board are adhered and discharged.

[0022] S4: The number of teeth on the lifting gear is half. When all of them are engaged with the power gear, the lifting gear will not be driven to rotate. At this time, the circuit board has rotated 180 degrees. The staff can check the cleanliness of the circuit board at this time. When impurities are still present, the motor is reversed, and the lifting gear will be engaged with the power gear to clean the circuit board again. After turning 180 degrees again, it stops rotating. When the cleaning is completed, the cylinder is started, and the cylinder rod rises to drive the lifting shaft to rise in the concave hole, so that the circuit board rises out of the cleaning box, and the circuit board is removed to complete the cleaning work.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention sets a positioning component inside the cleaning box. After the circuit board is fixed, the motor is started and driven by the power gear to engage with the lifting gear, so that the circuit board is driven to rotate and clean in the cleaning box through the lifting shaft. The number of gears of the lifting gear is half. When all the gears are engaged, the circuit board will no longer rotate and will flip 180 degrees horizontally. At this time, the staff can check the condition of the circuit board. After cleaning, the circuit board is driven to rise by the lifting cylinder, so that the cleaning condition of the circuit board can be checked during the cleaning process to avoid the situation where the cleaning time is too long and damage to the circuit board is caused. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the overall circuit board cleaning equipment in the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the concave holes and positioning plates inside the cleaning box in the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the lifting gear and other components outside the cleaning box in the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the lifting gear and the lifting and flipping assembly in the present invention;

[0029] Figure 5 It is a schematic diagram of the structure of the positioning plate and the positioning assembly in the present invention;

[0030] Figure 6 It is a schematic diagram of the structure of the cleaning box, the internal exhaust plate, the heating rod and other components in the present invention;

[0031] Figure 7 It is a schematic diagram of the structure of components such as the external air supply machine and air pipe of the cleaning box in the present invention.

[0032] In the figure:

[0033] 1. Cleaning box; 2. Concave hole; 3. Positioning wheel; 4. Lifting shaft; 5. Positioning plate; 6. Lifting gear; 7. Placement plate; 8. Insertion rod; 9. Side plate; 10. Positioning block; 11. Rubber block; 12. Through hole; 13. Bayonet pin; 14. Elastic pull rope; 15. Rubber sleeve; 16. Support plate; 17. Heating rod; 18. Air supply machine; 19. Exhaust plate; 20. Air outlet; 21. Air pipe; 22. Power gear; 23. Motor; 24. Positioning clamp; 25. Lifting cylinder; 26. Vertical plate. DETAILED DESCRIPTION

[0034] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0035] As attached Figure 1 To Attachment Figure 7 As shown:

[0036] Embodiment 1: The present invention provides a board surface cleaning system and a cleaning method for PCB circuit board production and processing, comprising a cleaning box 1, two opposite side plates 9 of the cleaning box 1 are provided with concave holes 2 on the top, a positioning wheel 3 is provided in the concave hole 2, a lifting shaft 4 is provided through the center of the positioning wheel 3, and a positioning plate 5 is provided on the opposite sides of the two lifting shafts 4, and a positioning assembly is provided on the positioning plate 5, and the positioning assembly is used to fix the circuit board;

[0037] A lifting gear 6 is provided on the lifting shaft 4 and on the outside of the cleaning box 1, a placement plate 7 is provided under the cleaning box 1, and a lifting and flipping component is provided on the placement plate 7. The lifting and flipping component drives the circuit board to realize lifting and flipping in the cleaning box 1 by driving the lifting shaft 4.

[0038] It should be noted that, by arranging a positioning component inside the cleaning box 1, after the circuit board is fixed, the motor 23 is started, and it is driven by the power gear 22 to engage with the lifting gear 6, so that the circuit board is driven to rotate and clean in the cleaning box 1 through the lifting shaft 4. The number of gears of the lifting gear 6 is half. When all the engagements are completed, the circuit board will no longer rotate and will flip horizontally by 180 degrees. At this time, the staff can check the condition of the circuit board. After cleaning, the circuit board is driven to rise by the lifting cylinder 25, so that the cleaning condition of the circuit board can be checked during the cleaning process to avoid the situation where the cleaning time is too long and damage to the circuit board is caused.

[0039] In this embodiment, the vertical section of the recessed hole 2 is "U"-shaped, and the two recessed holes 2 are arranged relatively to each other, the positioning wheel 3 is movably inserted into the recessed hole 2, and the lifting shaft 4 is fixedly connected to the positioning wheel 3.

[0040] The recessed hole 2 is provided so that the lifting shaft 4 can achieve up and down displacement in the recessed hole 2, thereby driving the circuit board to rise out of the cleaning box 1 after cleaning. The positioning wheel 3 is provided on the lifting shaft 4, and the two sides of the positioning wheel 3 are clamped on the recessed hole 2, so that the lifting shaft 4 can achieve vertical movement.

[0041] In this embodiment, the positioning assembly includes an insertion rod 8, a side panel 9, a positioning block 10 and a rubber block 11. The side wall of the positioning plate 5 is symmetrically provided with through holes 12 distributed up and down. The vertical section of the side panel 9 is "L"-shaped, and the insertion rod 8 is symmetrically distributed on the side panel 9.

[0042] In this embodiment, the other end of the insertion rod 8 extends to the through hole 12 and is movably arranged, and the two side panels 9 and the positioning plate 5 together form a "concave" shape. The positioning blocks 10 are symmetrically distributed up and down on the side of the positioning plate 5 close to the circuit board and on the opposite surfaces of the two side panels 9, and the number of positioning blocks 10 on the positioning plate 5 is not less than two. The rubber block 11 is located between the upper and lower positioning blocks 10, and the circuit board is inserted into the rubber block 11.

[0043] It should be noted that by setting a positioning block 10 on the positioning plate 5 and the side plate 9, the rubber block 11 is installed between the positioning blocks 10, and the shape of the rubber block 11 is "concave", so that the circuit board can be inserted into it. The positioning rubber block 11 on the side plate 9 can completely fix the circuit board, ensuring that the circuit board will not fall off when it is turned over.

[0044] The designed rubber block 11 will not cause damage to the circuit board, and is fixed from all sides, effectively reducing the fixing area and improving the cleaning degree of the circuit board.

[0045] Moreover, the side plate 9 is movably connected to the positioning plate 5 through the insertion rod 8, so that the position of the side plate 9 can be adjusted, so that circuit boards of different widths can be targeted, thereby improving the flexibility of the device;

[0046] In this embodiment, the top and bottom of the positioning plate 5 are provided with spaced-apart latching pins 13, and the side plate 9 is provided with elastic pull ropes 14 above and below the insertion rod 8. The other end of the elastic pull rope 14 is connected to a rubber sleeve 15. When the side plate 9 fixes the circuit board, the rubber sleeve 15 is inserted into the latching pin 13.

[0047] It should be noted that an elastic pull rope 14 is provided on the side panel 9. After the rubber block 11 on the side panel 9 fixes the circuit board, the rubber sleeve 15 on the elastic pull rope 14 can be inserted into the pin 13 at the corresponding position, thereby fixing the side panel 9, and the adjustment is simple.

[0048] In this embodiment, support plates 16 are provided at the four corners of the bottom of the cleaning box 1, the placement plate 7 is connected between two support plates 16, and heating rods 17 with an external power supply are symmetrically provided inside the cleaning box 1 and near the bottom.

[0049] It should be noted that the heating rod 17 is externally connected to an external display device, and can heat the cleaning agent, thereby improving the cleaning degree of the cleaning agent.

[0050] In this embodiment, an air supply machine 18 is provided on the top of the placement plate 7, and an exhaust plate 19 is provided on the top of the bottom plate of the cleaning box 1. The exhaust plate 19 is provided with air outlet holes 20 distributed at intervals, and an air supply pipe 21 connected to the air outlet holes 20 and the air supply machine 18 is provided.

[0051] It should be noted that the air supply machine 18 transports gas to the exhaust plate 19 through the air pipe 21, and the gas emerges through the air outlet 20, thereby forming bubbles in the cleaning agent. The bubbles can not only make the cleaning agent in the cleaning box 1 tumble, but also the bubbles will burst after contacting the circuit board. After the bubbles come into contact with the circuit board and burst, they can bring out impurities on the circuit board, thereby improving the cleaning degree of the circuit board.

[0052] In this embodiment, the number of gear teeth on the lifting gear 6 is one-half of the entire gear plate. The lifting and flipping assembly includes a power gear 22, a motor 23, a positioning clamp 24 and a lifting cylinder 25. The power gear 22 is at the bottom of the lifting gear 6 and the two cooperate with each other. A vertical plate 26 is provided on one side of the power gear 22, and the motor 23 is installed on the vertical plate 26. The output shaft of the motor 23 passes through the vertical plate 26 and is connected to the power gear 22.

[0053] In this embodiment, the positioning clamp 24 is connected to one end of the lifting shaft 4 extending out of the cleaning box 1, the positioning clamp 24 is sleeved on the lifting shaft 4 and rotatably connected, the lifting cylinder 25 is fixedly connected to the top of the placement plate 7, and the cylinder rod of the lifting cylinder 25 is fixedly connected to the outer wall of the positioning clamp 24. When the gear teeth on the lifting gear 6 are engaged with the power gear 22, the lifting shaft 4 no longer rotates.

[0054] It should be noted that the positioning clamp 24 is movably mounted on the lifting shaft 4. When the cylinder rod moves upward, the lifting shaft 4 is driven upward from both sides, thereby driving the circuit board to rise out of the cleaning box 1. After cleaning, it can be removed easily and conveniently.

[0055] As can be seen from the above, when the circuit board needs to be cleaned, there is a positioning component on the positioning plate 5 inside the cleaning box 1. The circuit board is placed in the cleaning box, and the two sides of the circuit board are inserted into the rubber blocks 11 on the positioning plate 5. The side panels 9 are moved on both sides so that the rubber blocks 11 on the side panels 9 fix the other two sides of the circuit board. The rubber sleeves 15 connected to the side panels 9 by the elastic pull ropes 14 are inserted into the bayonet pins 13 to fix the circuit board. A specific cleaning agent is placed in the cleaning box 1 so that it submerges the circuit board.

[0056] The motor 23 is started, and the output shaft of the motor 23 is connected to the power gear 22. The power gear 22 cooperates with the lifting gear 6 to drive the lifting gear 6 to rotate, and the circuit board is driven to rotate in the cleaning box 1 through the lifting shaft 4 for cleaning.

[0057] At the same time, the air supply machine 18 is started, and the air supply machine 18 conveys gas to the exhaust plate 19 through the air supply pipe 21, and the gas emerges through the air outlet 20, thereby forming bubbles in the cleaning agent. The bubbles can not only make the cleaning agent in the cleaning box 1 tumble, but also the bubbles will burst after contacting the circuit board, and the impurities attached to the circuit board will be adhered and discharged.

[0058] Because the number of teeth on the lifting gear 6 is half of that of the wheel disc, when it is meshed with the power gear 22 in the initial state, it drives the circuit board to rotate in the cleaning box 1. When the gear teeth on the lifting gear 6 are fully meshed with the power gear 22, the lifting gear 6 will no longer be driven to rotate. At this time, the circuit board has rotated 180 degrees. At this time, although the power gear 22 is still rotating, the circuit board will no longer move. The staff can check the cleanliness of the circuit board at this time. When impurities are still present, the motor 23 is reversed, and the lifting gear 6 will be meshed with the power gear 22. The circuit board rotates in the opposite direction in the cleaning box 1 for cleaning. After reversing 180 degrees again, it stops rotating and the cleanliness of the circuit board is observed again. When cleaning is completed, the cylinder is started, and the cylinder rod rises and drives the lifting shaft 4 to rise in the recessed hole 2 through the positioning clamp 24, so that the circuit board rises out of the cleaning box 1, the circuit board is removed, and the cleaning work is completed.

[0059] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A board surface cleaning system for PCB circuit board production and processing, characterized in that: include: A cleaning box (1), wherein two opposite side plates (9) of the cleaning box (1) are provided with concave holes (2) at the top, a positioning wheel (3) is provided in the concave hole (2), a lifting shaft (4) passing through the center of the positioning wheel (3), and positioning plates (5) are provided on the opposite surfaces of the two lifting shafts (4), and a positioning assembly is provided on the positioning plate (5), and the positioning assembly is used to fix the circuit board; A lifting gear (6) is provided on the lifting shaft (4) and on the outside of the cleaning box (1); a placement plate (7) is provided below the cleaning box (1); a lifting and flipping assembly is provided on the placement plate (7); the lifting and flipping assembly cooperates with the lifting gear (6) to drive the circuit board to be lifted and flipped in the cleaning box (1).

2. The PCB circuit board production and processing board surface cleaning system as claimed in claim 1, characterized in that: The vertical cross-section of the concave hole (2) is "U"-shaped, and the two concave holes (2) are arranged relative to each other. The positioning wheel (3) is movably inserted into the concave hole (2), and the lifting shaft (4) is fixedly connected to the positioning wheel (3).

3. The PCB board surface cleaning system for production and processing as claimed in claim 1, characterized in that: The positioning assembly comprises an insertion rod (8), a side plate (9), a positioning block (10) and a rubber block (11); the side wall of the positioning plate (5) is symmetrically provided with through holes (12) distributed up and down; the vertical section of the side plate (9) is "L"-shaped; and the insertion rod (8) is symmetrically distributed on the side plate (9).

4. The PCB circuit board production and processing board surface cleaning system as claimed in claim 3, characterized in that: The other end of the insertion rod (8) extends into the through hole (12) and is movably arranged, and the two side panels (9) and the positioning plate (5) together form a "concave" shape, and the positioning blocks (10) are symmetrically distributed up and down on a side of the positioning plate (5) close to the circuit board and on the opposite surfaces of the two side panels (9), and the number of the positioning blocks (10) on the positioning plate (5) is not less than two, and the rubber block (11) is located between the upper and lower positioning blocks (10), and the circuit board is inserted into the rubber block (11).

5. The PCB board surface cleaning system for production and processing as claimed in claim 4, characterized in that: The top and bottom of the positioning plate (5) are provided with spaced-apart latches (13); the side plate (9) and above and below the insertion rod (8) are provided with elastic pull ropes (14); the other end of the elastic pull rope (14) is connected to a rubber sleeve (15); when the side plate (9) is fixed to the circuit board, the rubber sleeve (15) is inserted into the latches (13).

6. The PCB circuit board production and processing board surface cleaning system as claimed in claim 1, characterized in that: Support plates (16) are provided at the four corners of the bottom of the cleaning box (1), the placement plate (7) is connected between two of the support plates (16), and heating rods (17) with an external power supply are symmetrically provided inside the cleaning box (1) and near the bottom.

7. The PCB board surface cleaning system for production and processing as claimed in claim 6, characterized in that: An air supply machine (18) is provided on the top of the placement plate (7), an exhaust plate (19) is provided on the top of the bottom plate of the cleaning box (1), and the exhaust plate (19) is provided with air outlet holes (20) distributed at intervals, and an air supply pipe (21) connected to the air outlet holes (20) and the air supply machine (18) is provided.

8. The PCB board surface cleaning system for production and processing as claimed in claim 1, characterized in that: The number of gear teeth on the lifting gear (6) is one-half of the number of gear teeth on the entire toothed disc. The lifting and flipping assembly comprises a power gear (22), a motor (23), a positioning clamp (24) and a lifting cylinder (25). The power gear (22) is at the bottom of the lifting gear (6) and the two cooperate with each other. A vertical plate (26) is provided on one side of the power gear (22). The motor (23) is mounted on the vertical plate (26). The output shaft of the motor (23) passes through the vertical plate (26) and is connected to the power gear (22).

9. The PCB circuit board production and processing board surface cleaning system as claimed in claim 8, characterized in that: The positioning clamp (24) is connected to one end of the lifting shaft (4) extending out of the cleaning box (1), and the positioning clamp (24) is sleeved on the lifting shaft (4) and rotatably connected. The lifting cylinder (25) is fixedly connected to the top of the placement plate (7), and the cylinder rod of the lifting cylinder (25) is fixedly connected to the outer wall of the positioning clamp (24). When the gear teeth on the lifting gear (6) are meshed with the power gear (22), the lifting shaft (4) no longer rotates.

10. A method for using the PCB circuit board production and processing board surface cleaning system according to any one of claims 1 to 9, comprising the following specific steps: S1: There is a positioning component on the positioning plate (5) inside the cleaning box (1). The circuit board is placed in the cleaning box so that the two sides of the circuit board are inserted into the rubber block (11) on the positioning plate (5). The two sides are moved by the side plates (9) so that the rubber blocks (11) on the side plates (9) fix the other two sides of the circuit board. The rubber sleeve (15) on the side plates (9) connected by the elastic pull rope (14) is inserted into the bayonet (13) to fix the circuit board. A specific cleaning agent is placed into the cleaning box (1) so as to submerge the circuit board. S2: The motor (23) is started, and the output shaft of the motor (23) is connected to the power gear (22). The power gear (22) cooperates with the lifting gear (6), thereby driving the lifting gear (6) to rotate, and driving the circuit board to rotate in the cleaning box (1) through the lifting shaft (4) for cleaning. S3: At the same time, the air supply machine (18) is started, and the air supply machine (18) conveys gas into the exhaust plate (19) through the air supply pipe (21), and the gas emerges through the air outlet (20), thereby forming bubbles in the cleaning agent. The bubbles can not only make the cleaning agent in the cleaning box (1) tumble, but also burst after contacting the circuit board, so that impurities attached to the circuit board are adhered and discharged. S4: The number of teeth on the lifting gear (6) is half. When all teeth are engaged with the power gear (22), the lifting gear (6) will no longer be driven to rotate. At this time, the circuit board has rotated 180 degrees. The staff can check the cleanliness of the circuit board. When impurities are still present, the motor (23) is reversed, and the lifting gear (6) is engaged with the power gear (22) to clean the circuit board again. After turning 180 degrees again, the lifting gear (6) stops rotating. When the cleaning is completed, the cylinder is started, and the cylinder rod rises to drive the lifting shaft (4) to rise in the recessed hole (2), so that the circuit board rises out of the cleaning box (1), and the circuit board is removed to complete the cleaning work.

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