A wind knife structure of a PCB cleaning device

Abstract

The utility model discloses a kind of air knife structures of PCB cleaning device, applied in PCB cleaning device technical field, and its technical solution main point is: including pedestal;Several lower conveying lines are rotationally connected in parallel on the pedestal, and lower air knife assembly for cleaning the back of PCB is fixedly connected to the bottom of the lower conveying line, the top of the lower conveying line is based on rotating assembly and is provided with upper air knife assembly rotationally connected to the pedestal on one end, the lower air knife assembly and the upper air knife assembly all include air knife seat and blow assembly fixedly connected to the middle position in the air knife seat along the conveying direction perpendicular to PCB, air knife seat is fixedly connected with suction assembly for absorbing dust impurities blown off in the both ends of the blow assembly;With technical effect is: simple structure, convenient maintenance, good cleaning effect.

Description

Technical Field

[0001] This utility model relates to the technical field of PCB board cleaning devices, and in particular to an air knife structure for a PCB board cleaning device. Background Technology

[0002] During the packaging, unpacking, and front / back mounting processes of PCBs, dust and impurities easily adhere to the PCB surface, leading to quality defects such as printing defects, excessive solder, stencil blockage, insufficient solder after reflow, solder bridging, open solder joints, and cold solder joints. To remove dust and impurities from the PCB surface, air knives are typically used to blow air onto the surface, ensuring a clean PCB. However, existing air knife structures have several drawbacks. First, the air knife is directly fixed to the conveyor line, requiring complete disassembly when the air vent is blocked, hindering future maintenance. Second, existing air knife structures remove dust and impurities directly by blowing air onto the PCB surface, but the blown-off dust and impurities remain suspended in the air or adhere to the conveyor line, continuing to adhere to the PCB surface and affecting the cleaning effect. Therefore, improvements are necessary. Utility Model Content

[0003] The purpose of this utility model is to provide an air knife structure for a PCB board cleaning device, which has the advantages of simple structure, convenient maintenance, and good cleaning effect.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an air knife structure for a PCB board cleaning device, including a base; a plurality of lower conveyor lines are rotatably connected in parallel on the base, a lower air knife assembly for cleaning the back of the PCB board is fixedly connected to the bottom of the lower conveyor lines, and an upper air knife assembly is provided at one end of the lower conveyor line based on a rotating component and rotatably connected to the base. Both the lower air knife assembly and the upper air knife assembly include an air knife seat and a blowing component fixedly connected to the middle position of the air knife seat along the conveying direction perpendicular to the PCB board. The air knife seat is symmetrically fixedly connected to the two ends of the blowing component to suction components for absorbing the blown-off dust and impurities.

[0005] The present invention is further configured such that: the rotating assembly includes a rotating seat fixedly connected to the base and a rotating shaft whose axis is fixedly connected to one end of the air knife seat along a conveying direction parallel to the PCB board; a gas spring for supporting the air knife seat is provided between the end of the air knife seat away from the rotating shaft and the base; and a lifting handle is also fixedly connected to the end of the air knife seat away from the rotating seat.

[0006] The present invention is further configured such that: the blowing assembly includes a blowing cavity opened in the air knife seat along the direction perpendicular to the PCB board conveying direction, and a blowing pipe symmetrically and fixedly connected to the middle of the top surface of the air knife seat for blowing air into the blowing cavity; an air outlet groove communicating with the blowing cavity is opened at the center of the bottom of the air knife seat; a blowing plate is fixedly connected to the bottom of the air knife seat; and a blowing groove communicating with the air outlet groove is opened in the blowing plate.

[0007] The present invention is further configured such that: the suction assembly includes suction chambers symmetrically opened inside the air knife seat along the conveying direction perpendicular to the PCB board and located on both sides of the blowing chamber, and suction pipes symmetrically and fixedly connected to both ends of the top surface of the air knife seat for suction into the suction chambers; an air inlet groove communicating with the suction chambers is opened at the center of the bottom of the air knife seat; a suction plate is fixedly connected to the bottom of the air knife seat; and a suction groove communicating with the air inlet groove is opened inside the suction plate.

[0008] The present invention is further configured such that: the end of the suction plate away from the air knife seat is provided with an inwardly inclined suction surface, and the included angle between the inclined suction surface and the side of the suction plate is between 30° and 60°.

[0009] The present invention is further configured such that: a uniform air distribution plate is fixedly connected inside the blowing cavity and the suction cavity, and a plurality of uniform air distribution holes are evenly opened on the uniform air distribution plate to improve the uniformity of blowing or suction; the diameter of the uniform air distribution holes in the suction cavity gradually decreases from the middle position of the uniform air distribution plate to both sides, and the diameter of the uniform air distribution holes in the blowing cavity gradually increases from the middle position of the uniform air distribution plate to both sides.

[0010] The present invention is further configured such that: both the blowing plate and the suction plate are horizontally adjustable and fixed on the air knife seat based on the locking adjustment assembly to adjust the intensity of blowing or suction. The locking adjustment assembly includes several adjustment grooves opened at the bottom of the air knife seat along the conveying direction parallel to the PCB board and locking holes opened on the blowing plate or the suction plate. Both the blowing plate and the suction plate are locked and fixed on the air knife seat by bolts and nuts.

[0011] The present invention is further configured such that: the blower seat is provided with an upper conveying line between the blower plate and the suction plate for abutting against the surface of the PCB board to ensure the flatness of the PCB board during transport.

[0012] In summary, this utility model has the following beneficial effects:

[0013] 1. By setting a rotating seat and a rotating shaft on the base, the upper air knife assembly can rotate around the rotating shaft to open and close. At the same time, the air knife seat is supported by a gas spring at the end away from the rotating shaft. When maintenance is required, simply pull the handle to lift the air knife seat, and the gas spring will automatically support and keep it in the open state. There is no need to disassemble the air knife as a whole, which greatly reduces the difficulty of maintenance and shortens the maintenance time.

[0014] 2. A blowing component is set in the middle of the air knife seat, and suction components are symmetrically set at both ends to form a closed-loop cleaning process in which the middle blows air to remove dust and the sides simultaneously remove it. When the blowing component sprays airflow onto the PCB board surface through the blowing channel to blow away the dust, the suction channels of the suction components on both sides immediately suck the suspended dust into the suction chamber and discharge it to the external dust removal system through the suction pipe. This prevents the dust from falling back onto the PCB board or adhering to the conveyor line, thus avoiding secondary pollution of the PCB board. By tilting the suction surface at the end of the suction plate, the dust suction range is expanded, and the airflow is guided to converge into the suction channel, enhancing the local negative pressure suction. Even small dust particles can be effectively captured. At the same time, the diameter of the air distribution holes in the blowing chamber increases from the middle to both sides, so that the airflow velocity at the edge is higher than that in the central area, ensuring that the dust at the edge of the PCB board is fully blown away. Meanwhile, the diameter of the air distribution holes in the suction chamber decreases from the middle to both sides, increasing the suction strength at the edge and preventing dust from escaping from both sides. The combination of the two makes the blowing and suction airflow evenly cover the entire PCB board surface, greatly improving the cleaning uniformity of the PCB board.

[0015] 3. By locking the adjustment components, the blowing plate and suction plate can be moved horizontally along the PCB board conveying direction, changing the opening size of the blowing channel and suction channel. This allows for adjustment of the blowing or suction intensity for PCB boards of different thicknesses or with varying degrees of dust adhesion. Increasing the opening of the blowing plate enhances the blowing force, while decreasing the opening of the suction plate increases the negative pressure, achieving dynamic adaptation of cleaning intensity and avoiding insufficient cleaning caused by a fixed air volume. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0017] Figure 2 This is a structural cross-sectional view of the air knife assembly in this embodiment;

[0018] Figure 3 yes Figure 2 Enlarged schematic diagram of part A;

[0019] Figure 4 This is a schematic diagram of the air distribution plate inside the blower assembly in this embodiment;

[0020] Figure 5 This is a schematic diagram of the air distribution plate inside the air intake assembly in this embodiment;

[0021] Figure 6This is an exploded view of the locking adjustment assembly in this embodiment.

[0022] Reference numerals: 1. Base; 2. Lower conveyor line; 3. Lower air knife assembly; 4. Rotating assembly; 41. Rotating seat; 42. Rotating shaft; 43. Lifting handle; 5. Upper air knife assembly; 51. Air knife seat; 52. Blowing assembly; 521. Blowing chamber; 522. Blowing pipe; 523. Air outlet slot; 524. Blowing plate; 525. Blowing slot; 53. Suction assembly; 531. Suction chamber; 532. Suction pipe; 533. Air inlet slot; 534. Suction plate; 535. Suction slot; 536. Inclined suction surface; 54. Air distribution plate; 55. Air distribution hole; 56. Locking and adjusting assembly; 561. Adjusting slot; 562. Locking hole; 6. Upper conveyor line. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings.

[0024] Example:

[0025] refer to Figures 1 to 6 A PCB board cleaning device includes an air knife structure comprising a base 1, several lower conveyor lines 2 rotatably connected in parallel on the base 1, a lower air knife assembly 3 for cleaning the back of the PCB board fixedly connected to the bottom of the lower conveyor lines 2, and an upper air knife assembly 5 rotatably connected to the base 1 at one end based on a rotating assembly 4 at the top of the lower conveyor lines 2. Both the lower air knife assembly 3 and the upper air knife assembly 5 include an air knife seat 51 and a blowing assembly 52 fixedly connected to the middle position of the air knife seat 51 along the conveying direction perpendicular to the PCB board. At both ends of the blowing assembly 52, suction assemblies 53 for absorbing the blown-off dust and impurities are symmetrically fixedly connected to the air knife seat 51. The blowing assembly 52 is set in the middle of the air knife seat 51, and the suction assemblies 53 are symmetrically set at both ends, forming a closed-loop cleaning process of blowing air to remove dust in the middle and suctioning it simultaneously on both sides, avoiding dust from falling back onto the PCB board or adhering to the conveyor line, and avoiding secondary pollution of the PCB board.

[0026] refer to Figure 1Specifically, the rotating assembly 4 includes a rotating seat 41 fixedly connected to the base 1 and a rotating shaft 42 whose axis is fixedly connected to one end of the air knife seat 51 along the conveying direction parallel to the PCB board. A gas spring (not shown in the attached figure) is provided between the end of the air knife seat 51 away from the rotating shaft 42 and the base 1 to support the air knife seat 51. The two ends of the gas spring are respectively hinged to the air knife seat 51 and the base 1 to provide support for the rotating seat 41 when it is lifted, so as to prevent the rotating seat 41 from falling. A lifting handle 43 is also fixedly connected to the end of the air knife seat 51 away from the rotating seat 41. By setting the rotating seat 41 and the rotating shaft 42 on the base 1, the upper air knife assembly 5 can rotate around the rotating shaft 42 to open and close. At the same time, the gas spring supports the end of the air knife seat 51 away from the rotating shaft 42. When maintenance is required, simply lift the lifting handle 43 to lift the air knife seat 51. The gas spring will automatically support and keep it in the open state without disassembling the air knife as a whole, which greatly reduces the difficulty of maintenance and shortens the maintenance time.

[0027] refer to Figures 2 to 3 Specifically, the blowing assembly 52 includes a blowing cavity 521 opened in the air knife seat 51 along the direction perpendicular to the PCB board conveying and a blowing pipe 522 symmetrically fixedly connected to the middle of the top surface of the air knife seat 51 for blowing air into the blowing cavity 521. An air outlet groove 523 communicating with the blowing cavity 521 is opened at the center of the bottom of the air knife seat 51. A blowing plate 524 is fixedly connected to the bottom of the air knife seat 51. A blowing groove 525 communicating with the air outlet groove 523 is opened in the blowing plate 524. External air enters the blowing cavity 521 from the blowing pipe 522, enters the blowing groove through the air outlet groove 523 and blows onto the surface of the PCB board. The blowing seat has an upper conveyor line 6 between the blowing plate 524 and the suction plate 534 for abutting against the surface of the PCB board to ensure the flatness of the PCB board conveying.

[0028] refer to Figures 2 to 3 Specifically, the suction assembly 53 includes suction chambers 531 symmetrically opened inside the air knife seat 51 along the direction perpendicular to the PCB board conveying and located on both sides of the blowing chamber 521, and suction pipes 532 symmetrically fixedly connected to both ends of the top surface of the air knife seat 51 for suction into the suction chambers 531. An air inlet groove 533 communicating with the suction chambers 531 is opened at the center of the bottom of the air knife seat 51. A suction plate 534 is fixedly connected to the bottom of the air knife seat 51. A suction groove 535 communicating with the air inlet groove 533 is opened inside the suction plate 534. The suction plate 534 has an inwardly inclined suction surface 536 at the end away from the air knife seat 51. By tilting the suction surface 536 at the end of the suction plate 534, the dust suction range is expanded, and the airflow is guided to converge towards the suction groove 535, thereby enhancing the local negative pressure suction. Even dust particles with small particle sizes can be effectively captured. The angle between the inclined suction surface 536 and the side of the suction plate 534 is between 30° and 60°, and is preferably 45° in this embodiment.

[0029] refer to Figures 4 to 5 Specifically, a uniform air distribution plate 54 is fixedly connected inside the blowing chamber 521 and the suction chamber 531. The uniform air distribution plate 54 is evenly provided with a number of uniform air distribution holes 55 to improve the uniformity of blowing or suction. The diameter of the uniform air distribution holes 55 in the suction chamber 531 gradually decreases from the middle of the uniform air distribution plate 54 to both sides, while the diameter of the uniform air distribution holes 55 in the blowing chamber 521 gradually increases from the middle of the uniform air distribution plate 54 to both sides. The increasing diameter of the uniform air distribution holes 55 in the blowing chamber 521 from the middle to both sides makes the airflow velocity at the edge higher than that in the center area, ensuring that the dust at the edge of the PCB board is fully blown away. The decreasing diameter of the uniform air distribution holes 55 in the suction chamber 531 from the middle to both sides increases the suction strength at the edge and prevents dust from escaping from both sides. The combination of the two makes the blowing and suction airflow evenly cover the entire surface of the PCB board, greatly improving the cleanliness and uniformity of the PCB board.

[0030] refer to Figure 6 Specifically, both the blower plate 524 and the suction plate 534 are horizontally adjustable and fixed to the air knife seat 51 based on the locking adjustment assembly 56 to adjust the intensity of blowing or suction. The locking adjustment assembly 56 includes several adjustment grooves 561 opened at the bottom of the air knife seat 51 along the conveying direction parallel to the PCB board, and locking holes 562 opened on the blower plate 524 or the suction plate 534. The blower plate 524 or the suction plate 534 are locked and fixed to the air knife seat 51 by bolts and nuts. By using the locking adjustment assembly 56, the blower plate 524 and the suction plate 534 can be horizontally moved along the conveying direction of the PCB board, changing the opening size of the blowing groove 525 and the suction groove 535. This allows for adjustment of the blowing or suction intensity for PCB boards of different thicknesses or with different degrees of dust adhesion. Increasing the opening of the blower plate 524 can enhance the blowing force, or decreasing the opening of the suction plate 534 can increase the negative pressure, achieving dynamic adaptation of cleaning intensity and avoiding insufficient cleaning caused by a fixed air volume.

[0031] Brief description of usage: During use, the PCB board is conveyed by the lower conveyor line 2 on the base 1. The upper conveyor line 6 of the upper air knife assembly 5 cooperates with the lower conveyor line 2 to clamp the PCB board to ensure flat conveying. An external air source supplies air to the blowing chamber 521 through the blowing pipe 522. After the airflow is evenly distributed by the air distribution plate 54, it is sprayed at high speed from the blowing channel 525 onto the surface of the PCB board to blow away dust. At the same time, the suction assembly 53 is connected to the negative pressure system through the suction pipe 532, forming a negative pressure in the suction chamber 531, which draws the airflow carrying dust from the suction channel 535 into the air intake channel 533. After being filtered by the air distribution plate 54 in the suction chamber 531, the air is sent to the external dust removal device through the suction pipe 532. During maintenance, the upper air knife assembly 5 rotates around the rotating shaft 42 to open when the handle 43 is pulled up. The gas spring support keeps it in the open state so that it can directly contact the inside for cleaning or maintenance. The bolts and nuts of the locking adjustment assembly 56 can also be loosened as needed, and the blowing plate 524 and the suction plate 534 can be moved along the adjustment groove 561 to adjust the opening size of the blowing groove 525 and the suction groove 535. After changing the blowing and suction intensity, the bolts and nuts can be tightened again to achieve cleaning of PCB boards of different specifications.

[0032] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment that make creative contributions as needed, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A PCB board cleaning device with an air knife structure, comprising a base (1); characterized in that, Several lower conveyor lines (2) are rotatably connected in parallel on the base (1). A lower air knife assembly (3) for cleaning the back of the PCB board is fixedly connected to the bottom of the lower conveyor line (2). An upper air knife assembly (5) is provided on the top of the lower conveyor line (2) based on the rotating assembly (4), with one end rotatably connected to the base (1). Both the lower air knife assembly (3) and the upper air knife assembly (5) include an air knife seat (51) and a blowing assembly (52) fixedly connected to the middle position of the air knife seat (51) along the conveying direction perpendicular to the PCB board. The air knife seat (51) is symmetrically fixedly connected to the two ends of the blowing assembly (52) with suction assemblies (53) for absorbing the blown-off dust and impurities.

2. The air knife structure of the PCB board cleaning device according to claim 1, characterized in that, The rotating assembly (4) includes a rotating seat (41) fixedly connected to the base (1) and a rotating shaft (42) whose axis is fixedly connected to one end of the air knife seat (51) along the conveying direction parallel to the PCB board. A gas spring for supporting the air knife seat (51) is provided between the end of the air knife seat (51) away from the rotating shaft (42) and the base (1). A lifting handle (43) is also fixedly connected to the end of the air knife seat (51) away from the rotating seat (41).

3. The air knife structure of the PCB board cleaning device according to claim 1, characterized in that, The blowing assembly (52) includes a blowing cavity (521) opened in the air knife seat (51) along the direction perpendicular to the PCB board conveying and a blowing pipe (522) symmetrically fixedly connected to the middle of the top surface of the air knife seat (51) for blowing air into the blowing cavity (521). The bottom center of the air knife seat (51) is provided with an air outlet groove (523) communicating with the blowing cavity (521). The bottom of the air knife seat (51) is fixedly connected with a blowing plate (524). The blowing plate (524) is provided with a blowing groove (525) communicating with the air outlet groove (523).

4. The air knife structure of the PCB board cleaning device according to claim 3, characterized in that, The suction assembly (53) includes suction chambers (531) symmetrically opened inside the air knife seat (51) on both sides of the blowing chamber (521) along the direction perpendicular to the PCB board conveying, and suction pipes (532) symmetrically fixedly connected to both ends of the top surface of the air knife seat (51) for suction into the suction chambers (531). An air inlet groove (533) communicating with the suction chambers (531) is opened at the center of the bottom of the air knife seat (51). A suction plate (534) is fixedly connected to the bottom of the air knife seat (51). A suction groove (535) communicating with the air inlet groove (533) is opened inside the suction plate (534).

5. The air knife structure of the PCB board cleaning device according to claim 4, characterized in that, The suction plate (534) has an inwardly inclined suction surface (536) at one end away from the air knife seat (51), and the angle between the inclined suction surface (536) and the side of the suction plate (534) is between 30° and 60°.

6. The air knife structure of the PCB board cleaning device according to claim 4, characterized in that, A uniform air distribution plate (54) is fixedly connected inside the blowing chamber (521) and the suction chamber (531). The uniform air distribution plate (54) is evenly provided with a plurality of uniform air distribution holes (55) for improving the uniformity of blowing or suction. The diameter of the uniform air distribution holes (55) in the suction chamber (531) gradually decreases from the middle position of the uniform air distribution plate (54) to both sides, and the diameter of the uniform air distribution holes (55) in the blowing chamber (521) gradually increases from the middle position of the uniform air distribution plate (54) to both sides.

7. The air knife structure of the PCB board cleaning device according to claim 4, characterized in that, The blowing plate (524) and the suction plate (534) are both horizontally adjustable and fixed on the air knife seat (51) based on the locking adjustment component (56) to adjust the intensity of blowing or suction. The locking adjustment component (56) includes several adjustment grooves (561) opened at the bottom of the air knife seat (51) along the conveying direction parallel to the PCB board and locking holes (562) opened on the blowing plate (524) or the suction plate (534). The blowing plate (524) or the suction plate (534) are both locked and fixed on the air knife seat (51) based on bolts and nuts.

8. The air knife structure of the PCB board cleaning device according to claim 4, characterized in that, The air knife holder (51) is provided with an upper conveying line (6) between the blowing plate (524) and the suction plate (534) to abut against the PCB board surface to ensure the flatness of the PCB board during transport.

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