Integrated circuit board cleaning equipment and cleaning method

Abstract

The invention relates to the field of circuit boards, in particular to integrated circuit board cleaning equipment and a cleaning method. The inner barrel is located in the outer barrel, the inner barrel and the outer barrel are connected through a damping mechanism, and an ultrasonic generator is arranged on the outer wall of the inner barrel; the water flow driving mechanism is arranged at the bottom of the inner barrel and used for driving the cleaning liquid in the inner barrel to rotate at a set speed; the bracket is arranged at the top of the peripheral wall of the outer barrel; the circuit board placing rack is used for placing a plurality of circuit boards and is inserted into the inner barrel, and the circuit board placing rack is connected with the bracket; the square box is arranged at the bottom of the circuit board placing frame, a filter screen is arranged at the bottom of the square box, and the square box can be turned over downwards to be opened. According to the cleaning device, vibration transmitted from the inner barrel to the outer barrel is reduced through the damping mechanism, so that vibration of the circuit board is reduced, high-frequency vibration damage to the circuit board is prevented, dirt can be concentrated to the middle of the bottom of the inner barrel through rotating cleaning liquid, and therefore the dirt is gathered on the filter screen, the replacement frequency of the cleaning liquid is reduced, resources are saved, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit boards, and in particular to an integrated circuit board cleaning device and a cleaning method. Background Art

[0002] In the electronics manufacturing industry, batch automated cleaning of integrated circuit boards is an important step in the production, maintenance, and repair of circuit boards. This is especially true after electronic components are installed, soldered, or used for a long time, where solder, residue, dust, oil, or other dirt may accumulate, affecting circuit performance.

[0003] A Chinese patent with the announcement number CN115811837B discloses a PCB circuit board stripping and cleaning device, which belongs to the field of circuit board cleaning and includes an ultrasonic cleaning machine body, an ultrasonic cleaning tank provided inside the ultrasonic cleaning machine body, a placement device provided in the ultrasonic cleaning tank of the ultrasonic cleaning machine body, the placement device including a clamping frame, a lifting bracket and an electric telescopic rod, a lifting bracket provided inside the clamping frame, and the lifting bracket movably mounted inside the clamping frame. The first partition plate, the second partition plate and the third partition plate in the lifting bracket divide the clamping chamber of the assembly frame into multiple placement chambers, and then the circuit boards to be cleaned are placed one by one in each placement chamber of the clamping chamber. The way the circuit boards are placed in the clamping chamber can improve the disadvantages of centralized placement of the circuit boards, such as reducing the trouble of incomplete cleaning caused by the circuit boards sticking to each other after being wetted, and the phenomenon of the circuit boards stacking at the bottom of the ultrasonic cleaning tank of the ultrasonic cleaning machine body also prolonging the cleaning time.

[0004] However, the above-mentioned disclosed solutions have the following shortcomings: the circuit board is placed in an assembly frame, and the assembly frame is directly placed in an ultrasonic cleaning tank. During ultrasonic cleaning, the vibration may cause high-frequency vibration of the circuit board and damage the circuit board. In addition, the dirt cleaned from the circuit board is directly dispersed into the cleaning liquid, which is easy to quickly contaminate the cleaning liquid. The cleaning liquid needs to be replaced frequently, which is time-consuming and labor-intensive, and increases costs. Summary of the Invention

[0005] The purpose of the present invention is to propose an integrated circuit board cleaning device and a cleaning method to address the problems in the background technology that high-frequency vibration of the circuit board may cause damage, and that dirt is directly dispersed into the cleaning liquid and the cleaning liquid needs to be replaced frequently.

[0006] In one aspect, the present invention provides an integrated circuit board cleaning device, comprising:

[0007] outer barrel;

[0008] The inner barrel is located inside the outer barrel. The inner barrel and the outer barrel are connected by a shock-absorbing mechanism to reduce the transmission of vibration from the inner barrel to the outer barrel. An ultrasonic generator is provided on the outer wall of the inner barrel.

[0009] The water flow driving mechanism is arranged at the bottom of the inner barrel and is used to drive the cleaning liquid in the inner barrel to rotate at a set speed;

[0010] A bracket is arranged on the top of the outer peripheral wall of the outer barrel;

[0011] A circuit board placement rack is used to place multiple circuit boards and is inserted into the inner barrel so that the circuit boards are located below the level of the cleaning liquid. The circuit board placement rack is connected to the bracket;

[0012] And a square box is arranged at the bottom of the circuit board placement rack, the bottom of the square box is a filter screen, and the square box can be turned downward to open, so as to discharge the accumulated materials on the filter screen.

[0013] Preferably, the shock absorbing mechanism includes a plurality of elastic members arranged at the bottom of the inner barrel, a screw rod vertically arranged at the bottom of the elastic member, and a plurality of elastic support blocks arranged on the outer peripheral wall of the inner barrel; a limiting ring is provided on the screw rod, the screw rod passes through the bottom of the outer barrel and is locked by a nut, and the elastic support block contacts the inner peripheral wall of the outer barrel.

[0014] Preferably, the water flow driving mechanism includes a power protection box arranged on the outer wall of the bottom of the inner barrel, a power device arranged in the power protection box, a turntable arranged on the output shaft of the power device, and a plurality of water flow driving plates arranged on the turntable.

[0015] Preferably, the bracket is a U-shaped bracket, the U-shaped groove of the U-shaped bracket opens toward the inner barrel, two brackets are symmetrically arranged on the outer barrel, positioning blocks are provided on the top of the two brackets, and the circuit board placement rack is placed between the two positioning blocks. Positioning grooves are provided on the top of the two brackets, and the positioning grooves form openings on the opposite end faces of the two brackets.

[0016] Preferably, the circuit board placement rack includes a plurality of equidistantly arranged U-shaped rods, flat plates arranged at both ends of the bottom of the U-shaped rods, and a plurality of circuit board placement strips arranged on the horizontal sections of the bottom of the plurality of U-shaped rods. A placement groove is provided on the circuit board placement strip, and the bottom of the circuit board is placed in the placement groove. The flat plates are placed on the bracket and the positions on both sides are limited by positioning blocks. In addition, a pressure plate is provided on the U-shaped rod for sliding along the vertical direction.

[0017] Preferably, a square frame is provided at the bottom of the circuit board placement rack, and the square box consists of two half box bodies, which are rotatably connected to the two ends of the bottom of the square frame respectively. In the cleaning state, the two half box bodies are assembled into a square box. When cleaning the upper surface of the filter screen, the two half box bodies are flipped outward and opened.

[0018] Preferably, a state adjustment mechanism is provided on the flat plate to change the state of the two half boxes being joined or opened.

[0019] In another aspect, the present invention provides a method for cleaning an integrated circuit board, comprising the following steps:

[0020] S1. Start the water flow driving mechanism to make the cleaning liquid in the inner barrel rotate at a low speed, place the circuit board on the circuit board placement rack, and then put the circuit board placement rack into the inner barrel so that the circuit board is below the liquid level of the cleaning liquid;

[0021] S2. Start the ultrasonic generator to start ultrasonic cleaning. The dirt washed off the circuit board is concentrated to the bottom of the inner barrel under the action of the rotating flow and then falls onto the filter;

[0022] S3. After cleaning, turn off the ultrasonic generator and remove the circuit board placement rack, then turn off the water flow driving mechanism;

[0023] S4. Open the square box, clean the dirt on the filter, and prepare to start the next circuit board cleaning work.

[0024] Compared with the prior art, the present invention has the following beneficial technical effects:

[0025] 1. The shock-absorbing mechanism reduces the vibration transmitted from the inner barrel to the outer barrel, thereby reducing the vibration of the circuit board placement rack and further reducing the vibration of the circuit boards, which helps to improve the placement stability of the circuit boards and prevent high-frequency vibration damage to the circuit boards;

[0026] 2. The low-speed rotating cleaning liquid can improve the ultrasonic cleaning uniformity and cleaning effect, prevent some areas of the circuit board from not being cleaned properly, and the rotating cleaning liquid can concentrate the dirt to the middle of the bottom of the inner barrel, thereby gathering on the filter. When the circuit board is subsequently removed, most of the cleaned dirt is taken out at the same time, which helps to keep the cleaning liquid clean, reduce the frequency of cleaning liquid replacement, save resources and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic structural diagram of an embodiment of the present invention;

[0028] Figure 2 for Figure 1 Schematic diagram after removing the outer barrel;

[0029] Figure 3 for Figure 2 Cross-sectional view of part of the structure;

[0030] Figure 4 for Figure 2 Schematic diagram after removing the inner barrel;

[0031] Figure 5 for Figure 4 Schematic diagram from another perspective.

[0032] Figure numerals: 1. outer barrel; 2. bottom support; 3. avoidance; 4. inner barrel; 5. elastic part; 6. screw; 7. limiting ring; 8. power protection box; 9. turntable; 10. water flow driving plate; 11. outer flange; 12. ultrasonic generator; 13. bracket; 14. positioning block; 15. U-shaped rod; 16. circuit board placement bar; 17. placement groove; 18. square frame; 19. shaft fixing seat; 20. square box; 21. filter screen; 22. triangular guide plate; 23. flat plate; 24. handle a; 25. vertical rod; 26. connecting rope; 27. handle b; 28. avoidance groove; 29. limiting strip; 30. limiting disk; 31. pressure plate; 32. strip groove; 33. sliding sleeve; 34. elastic support block. DETAILED DESCRIPTION

[0033] Example 1, as Figure 1-Figure 4 As shown, the present invention provides an integrated circuit board cleaning device, comprising:

[0034] Outer barrel 1;

[0035] The inner barrel 4 is located inside the outer barrel 1. The inner barrel 4 and the outer barrel 1 are connected by a shock-absorbing mechanism to reduce the transmission of vibration of the inner barrel 4 to the outer barrel 1. An ultrasonic generator 12 is provided on the outer wall of the inner barrel 4. To facilitate maintenance and replacement of the ultrasonic generator 12, an avoidance opening 3 for the ultrasonic generator 12 to pass through is provided on the outer barrel 1.

[0036] The water flow driving mechanism is provided at the bottom of the inner barrel 4 and is used to drive the cleaning liquid in the inner barrel 4 to rotate at a set speed, a low speed, and a rotation speed not exceeding two revolutions per second;

[0037] A bracket 13 is provided on the top of the outer wall of the outer barrel 1;

[0038] A circuit board placement rack is used to place multiple circuit boards and is inserted into the inner barrel 4 so that the circuit boards are located below the level of the cleaning liquid. The circuit board placement rack is connected to the bracket 13;

[0039] And a square box 20 is arranged at the bottom of the circuit board placement rack. The bottom of the square box 20 is a filter screen 21. The square box 20 can be flipped downward to open, so as to discharge the deposits on the filter screen 21.

[0040] Example 2, as Figure 1-Figure 3 As shown, the integrated circuit board cleaning device proposed by the present invention, compared with the first embodiment, this embodiment introduces the structure of the shock absorbing mechanism and the water flow driving mechanism in detail.

[0041] The shock-absorbing mechanism includes a plurality of elastic members 5 arranged at the bottom of the inner barrel 4, a screw 6 vertically arranged at the bottom of the elastic member 5, and a plurality of elastic support blocks 34 arranged on the outer peripheral wall of the inner barrel 4; a limiting ring 7 is provided on the screw 6, the screw 6 passes through the bottom of the outer barrel 1 and is locked by a nut, and the elastic support block 34 is in contact with the inner peripheral wall of the outer barrel 1; through the elastic support block 34 and the elastic member 5, the vibration of the inner barrel 4 can be reduced from being transmitted to the outer barrel 1; in an optional embodiment, the elastic member 5 and the elastic support block 34 are both elastic rubber cylinders, and a bottom support 2 is provided at the bottom of the outer barrel 1, through which the screw 6 and the nut are separated from the ground; in addition, in order to prevent the cleaning liquid in the inner barrel 4 from accidentally entering between the outer barrel 1 and the inner barrel 4, an outer flange 11 is provided at the top of the inner barrel 4, the outer flange 11 buckles the top of the outer barrel 1 but the two do not contact, and a certain gap is left to prevent the outer flange 11 from transmitting vibration to the outer barrel 1.

[0042] The water flow driving mechanism includes a power protection box 8 arranged on the outer wall of the bottom of the inner barrel 4, a power device arranged in the power protection box 8, a turntable 9 arranged on the output shaft of the power device, and multiple water flow driving plates 10 arranged on the turntable 9; in an optional embodiment, the power device is a combination of a motor and a reducer, which reduces the speed of rotation through the reducer to drive the turntable 9 to rotate slowly, and then drives the cleaning liquid in the inner barrel 4 to rotate in a directional manner through the water flow driving plate 10, and multiple water flow driving plates 10 are provided.

[0043] Example 3, as Figure 1 and Figure 4 As shown, the present invention proposes an integrated circuit board cleaning device. Compared with the second embodiment, this embodiment introduces the structure of the circuit board placement rack in detail.

[0044] The bracket 13 is a U-shaped bracket, and the U-shaped groove of the U-shaped bracket opens toward the inner barrel 4. Specifically, the outer flange 11 passes through the U-shaped bracket. Two brackets 13 are symmetrically arranged on the outer barrel 1. Positioning blocks 14 are provided on the tops of the two brackets 13. The circuit board placement rack is placed between the two positioning blocks 14. Positioning grooves are provided on the tops of the two brackets 13, and the positioning grooves form openings on the opposite end faces of the two brackets 13.

[0045] The circuit board placement rack includes a plurality of U-shaped rods 15 arranged at equal intervals, a flat plate 23 arranged at both ends of the bottom of the U-shaped rod 15, and a plurality of circuit board placement bars 16 arranged on the horizontal sections of the bottom of the plurality of U-shaped rods 15. A placement groove 17 is provided on the circuit board placement bar 16, and the bottom of the circuit board is placed in the placement groove 17. The flat plate 23 is placed on the bracket 13 and the position on both sides is limited by the positioning block 14. A handle a24 is provided on the flat plate 23. The circuit board placement rack is kept stable on the bracket 13 by its own weight. In order to improve the placement stability of the circuit board, the circuit board placement bar 16 and the placement groove 17 are both U-shaped. In addition, a pressure plate 31 is provided on the U-shaped rod 15 for sliding in the vertical direction. After the circuit board is placed, the top of the circuit board is pressed by the pressure plate 31 to further improve the stability of the circuit board. In an optional embodiment, the pressure plate 31 is a flat plate and a plurality of strip grooves 32 are provided on it to reduce the resistance to the rotation of the cleaning liquid. A plurality of sliding sleeves 33 are provided at both ends of the pressure plate 31. The sliding sleeves 33 are sleeved on the vertical section of the U-shaped rod 15 and can slide up and down.

[0046] Furthermore, a square frame 18 is provided at the bottom of the circuit board placement rack, and the square box 20 is composed of two half box bodies, which are rotatably connected to the two ends of the bottom of the square frame 18 respectively. In the cleaning state, the two half box bodies are assembled into the square box 20. When cleaning the upper surface of the filter 21, the two half box bodies are flipped outward and opened; in this embodiment, a shaft fixing seat 19 is provided at both ends of the bottom of the square frame 18, and a shaft is rotatably provided on the shaft fixing seat 19, and the top of the half box body is connected to the shaft.

[0047] Example 4, as Figure 4-Figure 5 As shown, the present invention proposes an integrated circuit board cleaning device. Compared with the third embodiment, this embodiment introduces the structure of the state adjustment mechanism in detail.

[0048] The plate 23 is provided with a state adjustment mechanism for changing the splicing or opening state of the two half box bodies; specifically, the state adjustment mechanism includes a triangular guide plate 22, a vertical rod 25 and a connecting rope 26; the triangular guide plate 22 is arranged on the outer surface of the two half box bodies, and a groove is arranged on the inclined surface of the triangular guide plate 22, and a hanging rod is arranged in the groove; an avoidance groove 28 is arranged on the plate 23, and the vertical rod 25 passes through the avoidance groove and the positioning groove on the bracket 13, and the two ends of the connecting rope 26 are respectively connected to the bottom of the vertical rod 25 and the hanging rod, and a handle b27 is provided at the bottom of the vertical rod 25, and a limit bar 29 and a limit plate 30 are provided on the vertical rod 25. The limit bar 29 is located above the limit plate 30, and the limit bar 29 is horizontal at the bottom of the positioning groove.

[0049] In a fifth embodiment, the present invention provides a method for cleaning an integrated circuit board, using the integrated circuit board cleaning device of the fourth embodiment, and specifically comprising the following steps:

[0050] S1. Start the water flow driving mechanism to make the cleaning liquid in the inner barrel 4 rotate at a low speed, place the circuit board on the circuit board placement rack, and then put the circuit board placement rack into the inner barrel 4 so that the circuit board is below the liquid level of the cleaning liquid;

[0051] S2, start the ultrasonic generator 12 to start ultrasonic cleaning. The dirt washed off the circuit board is concentrated to the bottom of the inner barrel 4 under the action of the rotating flow, and then falls onto the filter 21;

[0052] S3. After cleaning, turn off the ultrasonic generator 12 and remove the circuit board placement rack, then turn off the water flow driving mechanism;

[0053] S4. Open the square box 20, clean the dirt on the filter 21, and prepare to start the next circuit board cleaning work.

[0054] In summary, when the present invention is in use, the motor is started to rotate the cleaning liquid in the inner barrel 4 at a low speed, the circuit board is placed on the placement groove 17, and then the circuit board placement rack is placed in the inner barrel 4 so that the circuit board is located below the liquid level of the cleaning liquid. At this time, the flat plate 23 is pressed on the bracket 13, and the two half-box bodies are combined into a square box 20. Then, the ultrasonic generator 12 is started to start ultrasonic cleaning. The dirt cleaned from the circuit board is concentrated to the bottom of the inner barrel 4 under the action of the rotation of the cleaning liquid, and then falls onto the filter 21. After cleaning, the ultrasonic generator 12 is turned off and the circuit board placement rack is taken out, and then the motor is turned off. If the next cleaning is needed immediately, the motor and ultrasonic generator 12 do not need to be turned off. After taking out the circuit board, the two vertical rods 25 are rotated upward to pull up the two half-box bodies to flip open, clean the filter 21 and then reset. In the present invention, the vibration transmitted from the inner barrel 4 to the outer barrel 1 is reduced by the shock-absorbing mechanism, thereby reducing the vibration of the circuit board placement rack, further reducing the vibration of the circuit board, helping to improve the placement stability of the circuit board, and preventing the circuit board from being damaged by high-frequency vibration; the low-speed rotating cleaning liquid can improve the ultrasonic cleaning uniformity and cleaning effect, preventing some areas of the circuit board from being not cleaned properly, and the rotating cleaning liquid can concentrate the dirt to the middle of the bottom of the inner barrel 4, thereby gathering on the filter 21, and subsequently taking out the circuit board while taking out most of the cleaned dirt, which helps to keep the cleaning liquid clean, reduce the frequency of changing the cleaning liquid, save resources, and reduce costs.

[0055] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. An integrated circuit board cleaning device, characterized in that: include: Outer barrel (1); The inner barrel (4) is located in the outer barrel (1). The inner barrel (4) and the outer barrel (1) are connected via a shock-absorbing mechanism to reduce the transmission of vibration of the inner barrel (4) to the outer barrel (1). An ultrasonic generator (12) is provided on the outer wall of the inner barrel (4). A water flow driving mechanism is provided at the bottom of the inner barrel (4) and is used to drive the cleaning liquid in the inner barrel (4) to rotate at a set speed; A bracket (13) is arranged on the top of the outer peripheral wall of the outer barrel (1); A circuit board placement rack is used to place a plurality of circuit boards and is inserted into the inner barrel (4) so that the circuit boards are located below the level of the cleaning liquid. The circuit board placement rack is connected to the bracket (13); A square box (20) is arranged at the bottom of the circuit board placement rack. The bottom of the square box (20) is a filter screen (21). The square box (20) can be turned downward to open, thereby draining the deposits on the filter screen (21).

2. The integrated circuit board cleaning device according to claim 1, characterized in that: The shock absorbing mechanism comprises a plurality of elastic members (5) arranged at the bottom of the inner barrel (4), a screw rod (6) vertically arranged at the bottom of the elastic member (5), and a plurality of elastic support blocks (34) arranged on the outer peripheral wall of the inner barrel (4); a limiting ring (7) is arranged on the screw rod (6), the screw rod (6) passes through the bottom of the outer barrel (1) and is locked by a nut, and the elastic support block (34) contacts the inner peripheral wall of the outer barrel (1).

3. The integrated circuit board cleaning device according to claim 1, characterized in that: The water flow driving mechanism comprises a power protection box (8) arranged on the outer wall of the bottom of the inner barrel (4), a power device arranged in the power protection box (8), a turntable (9) arranged on the output shaft of the power device, and a plurality of water flow driving plates (10) arranged on the turntable (9).

4. The integrated circuit board cleaning device according to claim 1, characterized in that: The bracket (13) is a U-shaped bracket, and the U-shaped groove of the U-shaped bracket opens toward the inner barrel (4). Two brackets (13) are symmetrically arranged on the outer barrel (1). Positioning blocks (14) are arranged on the tops of the two brackets (13). The circuit board placement rack is placed between the two positioning blocks (14). Positioning grooves are arranged on the tops of the two brackets (13), and the positioning grooves form openings on the opposite end surfaces of the two brackets (13).

5. The integrated circuit board cleaning device according to claim 4, characterized in that: The circuit board placement rack comprises a plurality of U-shaped rods (15) arranged at equal intervals, flat plates (23) arranged at both ends of the bottom of the U-shaped rods (15), and a plurality of circuit board placement bars (16) arranged on the horizontal sections of the bottom of the plurality of U-shaped rods (15). A placement groove (17) is provided on the circuit board placement bar (16), the bottom of the circuit board is placed in the placement groove (17), the flat plate (23) is placed on the bracket (13) and the position of both sides is limited by the positioning block (14). In addition, a pressing plate (31) is provided on the U-shaped rod (15) to slide in the vertical direction.

6. The integrated circuit board cleaning device according to claim 4, characterized in that: A square frame (18) is provided at the bottom of the circuit board placement rack. The square box (20) is composed of two half box bodies. The two half box bodies are rotatably connected to the two ends of the bottom of the square frame (18). In the cleaning state, the two half box bodies are assembled into the square box (20). When cleaning the upper surface of the filter (21), the two half box bodies are turned outward and opened.

7. The integrated circuit board cleaning device according to claim 6, characterized in that: A state adjustment mechanism is provided on the flat plate (23) for changing the states of the two half boxes being joined or opened.

8. A method for cleaning an integrated circuit board, using the integrated circuit board cleaning device according to claim 1, characterized in that: The following steps are involved: S1. Start the water flow driving mechanism to rotate the cleaning liquid in the inner barrel (4) at a low speed, place the circuit board on the circuit board placement rack, and then place the circuit board placement rack into the inner barrel (4) so that the circuit board is located below the liquid level of the cleaning liquid; S2, start the ultrasonic generator (12) to start ultrasonic cleaning, and the dirt washed off the circuit board is concentrated to the bottom of the inner barrel (4) under the action of the rotating flow, and then falls onto the filter (21); S3. After cleaning is completed, the ultrasonic generator (12) is turned off and the circuit board placement rack is removed, and then the water flow driving mechanism is turned off; S4, open the square box (20), clean the dirt on the filter (21), and prepare to start the next circuit board cleaning work.

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