A dry ice cleaning device for PCB circuit boards

Abstract

The present invention relates to the technical field of PCB circuit board cleaning, and proposes a dry ice cleaning device for PCB circuit boards, comprising a vertical box, a loading unit, a unloading unit, a dry ice cleaning unit, and a drive assembly. The vertical box has a cylindrical cavity with a horizontal axis, and has an inlet and an outlet, two opposite vents, and an air passage. The dry ice cleaning unit is rotatably arranged in the cylindrical cavity, and has a cleaning space that can be connected to the inlet and the outlet, or to the two vents, and the cleaning space is provided with a limiting transmission channel that can clamp the two opposite side edges in the normal direction of the PCB circuit board. The drive assembly is arranged in the vertical box, and can drive the dry ice cleaning unit to pitch and rotate, so that the cleaning space is connected to the inlet and the outlet, or to the two vents. Through the above technical solution, the problem of poor practicality of the existing cleaning method of the cleaning machine is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of PCB circuit board cleaning, and in particular to a dry ice cleaning device for a PCB circuit board. Background Art

[0002] PCB circuit board is one of the important components of the electronics industry and is widely used in various electronic devices. PCB circuit board consists of an insulating base plate, connecting wires and pads for assembling and soldering electronic components. It has the dual functions of a conductive circuit and an insulating base plate, and can replace complex wiring to achieve electrical connection between components in the circuit. In order to ensure the quality of the PCB board, it is necessary to clean the dust and impurities adsorbed on the surface of the PCB circuit board after processing. For the surface cleaning of the PCB circuit board, dry ice cleaning is usually adopted, that is, dry ice powder is sprayed onto the surface of the PCB circuit board. After the dry ice powder contacts the dust on the surface of the PCB circuit board, it quickly vaporizes and blows the dust away. The dry ice powder will not form new pollution after vaporization, which not only improves the cleaning effect of the PCB circuit board surface, but also reduces the damage to the PCB circuit board.

[0003] In the prior art, for the cleaning of PCB circuit boards using dry ice, a cleaning machine is usually used. The cleaning machine has a linear conveyor belt that can deliver the PCB circuit board into a cleaning chamber. The cleaning chamber is equipped with a visual inspection, a movable nozzle, and a clamping and positioning component. The PCB circuit board has two board surfaces. The clamping and positioning component clamps the PCB circuit board after visual inspection, and can drive the PCB circuit board to flip so that the two board surfaces face the nozzle respectively, thereby achieving comprehensive cleaning of the two board surfaces. However, in the actual cleaning process, the clamping and positioning component abuts and clamps the outer edge of the PCB circuit board along the extension direction of the board surface, and in order to avoid damaging the PCB circuit board, its clamping force should not be too large. However, the spraying of dry ice powder on the PCB circuit board will give it an impact force, causing the PCB circuit board to vibrate or shake, and the PCB circuit board is easy to detach from the clamping, which requires stopping the machine and removing the detached PCB circuit board, resulting in reduced cleaning efficiency and poor practicality. In addition, during the dry ice cleaning process, a large amount of carbon dioxide generated by the sublimation of dry ice will overflow in the cleaning chamber, causing the carbon dioxide content in the space where the cleaning machine is located (dust-free workshop) to increase, which is unsafe. At the same time, impurities carried by the cleaning will also be brought into the space where the cleaning machine is located (dust-free workshop), causing environmental pollution and poor practicality. Summary of the Invention

[0004] The present invention provides a dry ice cleaning device for a PCB circuit board, which solves the problem of poor practicality of the existing cleaning method of a cleaning machine.

[0005] The technical solution of the present invention is as follows: A dry ice cleaning device for a PCB circuit board, comprising:

[0006] A vertical box body has a cylindrical cavity with a horizontal axis, an inlet and an outlet are provided on the side wall of the cylindrical cavity and pass through the vertical box body in a horizontal direction, and two opposite vents are also provided on the side wall of the cylindrical cavity; a line connecting the inlet and the outlet is arranged at an angle to a line connecting the two vents; an air passage is provided in the vertical box body and communicates with the two vents;

[0007] A loading unit is provided on one side of the vertical box body and has a feeding end corresponding to the inlet;

[0008] a material discharge unit, arranged on the other side of the vertical box body, and having a material discharge end corresponding to the outlet;

[0009] a dry ice cleaning unit rotatably disposed in the cylindrical cavity, having a cleaning space that can communicate with the inlet and the outlet, or with the two vents, wherein the cleaning space is provided with a limit transmission channel for clamping two opposite side edges of the PCB in a normal direction thereof;

[0010] A drive assembly is disposed in the vertical box and is dynamically connected to the dry ice cleaning unit, and is used to drive the dry ice cleaning unit to pitch and rotate so that the cleaning space is connected to the inlet and outlet, or to the two vents.

[0011] As a further technical solution, the dry ice cleaning unit includes:

[0012] A flip box is rotatably arranged in the cylindrical cavity, and connecting shafts are respectively provided on both sides of the flip box, which are collinear with the axis of the cylindrical cavity and extend outward, and both connecting shafts are rotatably connected to the vertical box body; the flip box has a through cavity that radially passes through both ends along the connecting shaft, and the through cavity is the cleaning space; the through cavity has a length direction that is in the same direction as the through direction, a width direction that is in the same direction as the axis of the connecting shaft, and a height direction that is perpendicular to the length direction and the width direction;

[0013] The first transmission structure comprises two groups, the two groups of the first transmission structures being spaced apart along the height direction, each group of the first transmission structures comprising two first rotating shafts spaced apart along the length direction, each of the first rotating shafts being disposed along the width direction and rotatably connected to the flip box; each of the first transmission structures is connected to a first driver;

[0014] There are two first adjustment structures, the two first adjustment structures are respectively arranged on both sides of the through cavity along the width direction, and each first adjustment structure has a mounting portion arranged toward the other first adjustment structure and movable along the width direction;

[0015] Two first upper conveyor belts are provided, and the two first upper conveyor belts are respectively arranged on the two mounting portions and are dynamically connected to the two first rotating shafts in one set of the first transmission structures;

[0016] Two first lower conveyor belts are provided, and the two first lower conveyor belts are respectively arranged on the two mounting portions and are dynamically connected to the two first rotating shafts in the other group of the first transmission structures. The two first lower conveyor belts and the two first upper conveyor belts form a position-limiting transmission channel arranged along the length direction and clamping the two side edges of the PCB circuit board;

[0017] Two dry ice cleaning structures are provided. The two dry ice cleaning structures are respectively arranged on both sides of the through cavity along the height direction, and are used to spray dry ice powder onto the two surfaces of the PCB circuit board respectively.

[0018] As a further technical solution, both ends of the turnover box are provided with arc-shaped sliding parts adapted to the side walls of the cylindrical cavity.

[0019] As a further technical solution, the first rotating shafts are all spline shafts.

[0020] As a further technical solution, the first regulating structure includes:

[0021] a first sliding plate, slidably disposed in the through cavity along the width direction, wherein the mounting portion is located on the first sliding plate;

[0022] an adjusting screw disposed colinearly with the connecting shaft, the adjusting screw being threadably connected to a nut portion disposed within the connecting shaft, one end of the adjusting screw extending into the through cavity, and being rotatably connected to the first sliding plate;

[0023] The through cavity is provided with a first guide rod for limiting the sliding of the first sliding plate; the first sliding plate is provided with a first through hole for the first rotating shaft to pass through;

[0024] Wherein, the connecting shaft has an axial hole connected to the through cavity, and the nut portion is located at one end of the axial hole close to the through cavity.

[0025] As a further technical solution, the dry ice cleaning structure includes:

[0026] A fixing seat, arranged on the inner wall of the through cavity, having a material guide cavity connected to an external dry ice supply device;

[0027] There are multiple nozzles, each of which is evenly distributed on the fixed seat and connected to the material guide cavity. Each of the nozzles has a nozzle facing the limit transfer channel.

[0028] As a further technical solution, the drive assembly includes:

[0029] an axle seat, arranged in the vertical box;

[0030] A power shaft is rotatably arranged on the shaft seat along the width direction, with both ends extending out of the shaft seat;

[0031] There are two first sprockets, which are respectively arranged at two ends of the power shaft;

[0032] There are two second sprockets, the two second sprockets are respectively arranged on the two connecting shafts, and the two second sprockets are arranged in a one-to-one correspondence with the two first sprockets;

[0033] There are two transmission chains, each of which is annularly sleeved on the outer periphery of the corresponding first sprocket and the second sprocket;

[0034] The second driver is arranged on the shaft seat and is connected to the power shaft in power.

[0035] As a further technical solution, an air jet assembly is further included, and the air jet assembly is arranged at one of the vents; the air jet assembly includes:

[0036] There are multiple air nozzles, each of which is evenly arranged in the corresponding air passage, and each of which is used to communicate with an external pressure pump;

[0037] A flip plate is vertically arranged in the air passage, and the top end of the flip plate is rotatably connected to the vertical box. The flip plate is used to rotate upward after the dry ice cleaning structure completes spraying of dry ice powder and the air nozzle sprays air, so as to block the corresponding air passage.

[0038] As a further technical solution, the loading unit has a loading channel that is used to clamp two opposite side edges of the PCB circuit board in the normal direction and corresponds to the limiting transfer channel.

[0039] As a further technical solution, the blanking unit has a blanking channel that is used to clamp two opposite side edges of the PCB circuit board in the normal direction and corresponds to the limit transmission channel.

[0040] The present invention has the following beneficial effects: the loading and unloading units ensure the entry and exit of PCBs. The position-limiting transmission channel provided in the dry ice cleaning unit can clamp the two opposing sides of the PCB in the normal direction, ensuring the stability of the PCB during dry ice cleaning and preventing the PCB from being pinched, thus providing high practicality. Furthermore, the dry ice cleaning unit, driven by a drive assembly, connects the cleaning space to two vents, ensuring that generated carbon dioxide is directly discharged through the air passage in the vertical box, thereby preventing overflow into the space and contaminating the environment, ensuring safety and high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Figure 1 Schematic diagram of the structure of the dry ice cleaning device for PCB circuit boards provided in an embodiment of the present invention Figure 1 ;

[0043] Figure 2 Schematic diagram of the structure of the dry ice cleaning device for PCB circuit boards provided in an embodiment of the present invention Figure 2 (Hidden sealing cover);

[0044] Figure 3 Schematic diagram of the main structure of the vertical box and dry ice cleaning unit of the dry ice cleaning device for PCB circuit boards provided by the embodiment of the present invention Figure 1 ;

[0045] Figure 4 Schematic diagram of the main structure of the vertical box and dry ice cleaning unit of the dry ice cleaning device for PCB circuit boards provided by the embodiment of the present invention Figure 2 (The side wall of the vertical box is cut open);

[0046] Figure 5 for Figure 3 A schematic cross-sectional view of a vertical housing and a dry ice cleaning unit of a dry ice cleaning device for a PCB circuit board provided in an embodiment;

[0047] Figure 6 A schematic structural diagram of a dry ice cleaning unit of a dry ice cleaning device for a PCB circuit board provided in an embodiment of the present invention;

[0048] Figure 7 A schematic diagram of the main structure of a dry ice cleaning unit of a dry ice cleaning device for a PCB circuit board provided by an embodiment of the present invention (full cross-section);

[0049] Figure 8 A schematic side view (half-section) of a dry ice cleaning unit of a dry ice cleaning device for a PCB circuit board provided in an embodiment of the present invention;

[0050] Figure 9 A schematic structural diagram of a loading unit or unloading unit of a dry ice cleaning device for a PCB circuit board provided in an embodiment of the present invention;

[0051] Figure: 10, vertical box; 11, cylinder cavity; 12, sealing cover; 13, inlet; 14, outlet; 15, vent; 16, air passage; 20, loading unit; 21, bottom box seat; 22, vertical plate; 23, second sliding plate; 24, bidirectional screw; 25, adjustment drive; 26, second upper conveyor belt; 27, second lower conveyor belt; 28, second rotating shaft; 29, third drive; 30, unloading unit; 40, dry ice cleaning unit; 41, flip box; 411, through cavity; 41 2. Connecting shaft; 42. First rotating shaft; 43. First adjusting structure; 431. First sliding plate; 432. Adjusting screw; 44. First upper conveyor belt; 45. First lower conveyor belt; 46. Dry ice cleaning structure; 461. Fixed seat; 462. Nozzle; 47. First driver; 50. Drive assembly; 51. Shaft seat; 52. Power shaft; 53. First sprocket; 54. Second sprocket; 55. Second driver; 56. Drive chain; 60. Jet assembly; 61. Air nozzle; 62. Flip plate. DETAILED DESCRIPTION

[0052] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0053] Please also refer to Figures 1 to 5 The dry ice cleaning device for PCB circuit boards provided by the present invention is now described. The dry ice cleaning device for PCB circuit boards includes a vertical box 10, a loading unit 20, a unloading unit 30, a dry ice cleaning unit 40, and a driving assembly 50.

[0054] Specifically, the vertical housing 10 has a cylindrical cavity 11 with a horizontal axis. The side walls of the cylindrical cavity 11 are provided with an inlet 13 and an outlet 14 that extend horizontally through the vertical housing 10. The side walls of the cylindrical cavity 11 are also provided with two opposing vents 15. The line connecting the inlet 13 and the outlet 14 is arranged at an angle to the line connecting the two vents 15. The vertical housing 10 is provided with an air passage 16 that communicates with the two vents 15. The loading unit 20 is disposed on one side of the vertical housing 10 and has a feed end corresponding to the inlet 13. The unloading unit 30 is disposed on the other side of the vertical housing 10 and has a discharge end corresponding to the outlet 14. The dry ice cleaning unit 40 is rotatably disposed in the cylindrical cavity 11 and has a cleaning space that can communicate with the inlet 13 and the outlet 14, or with the two vents 15. The cleaning space is provided with a limit transmission channel that can clamp two opposing sides of the PCB in the normal direction. The drive assembly 50 is disposed in the vertical box 10 and is power-connected to the dry ice cleaning unit 40 , and can drive the dry ice cleaning unit 40 to pitch and rotate so that the cleaning space is connected to the inlet 13 and the outlet 14 , or to the two vents 15 .

[0055] The operating principle of the PCB dry ice cleaning device provided in this embodiment is as follows: in an initial state, the dry ice cleaning unit 40 is connected to the inlet 13 and the outlet 14. The PCB to be cleaned is placed on the loading unit 20, transported by the loading unit 20, and enters the limited transfer channel in the cleaning space through the inlet 13. Once the PCB to be cleaned enters the limited transfer channel, the dry ice cleaning unit 40, driven by the drive assembly 50, pitches and rotates to connect the cleaning space with the two vents 15. At this time, the dry ice cleaning unit 40 cleans the PCB in the limited transfer channel, and the generated carbon dioxide gas is directly transferred to the air passage 16 through the two vents. When the dry ice cleaning unit 40 is finished, it pitches and rotates downward until it connects to the inlet 13 and the outlet 14. The cleaned PCB is then introduced into the unloading unit 30 through the outlet 14.

[0056] Compared to the prior art, the dry ice cleaning device for PCBs provided in this embodiment features a loading unit 20 and a unloading unit 30 that ensure the entry and exit of PCBs. The position-limiting transmission channel provided in the dry ice cleaning unit 40 can clamp the two opposing sides of the PCB in the normal direction, ensuring the stability of the PCB during dry ice cleaning and preventing the PCB from being pinched, thus providing high practicality. Furthermore, the dry ice cleaning unit 40, driven by the drive assembly 50, connects the cleaning space to two vents, ensuring that the generated carbon dioxide is directly discharged through the air passage 16 in the vertical box 10, thereby preventing overflow into the space and contaminating the environment, ensuring safety and high practicality.

[0057] It should be noted that the air passage 16 can be connected to the exhaust pipe through a pipeline. This structure belongs to the treatment of exhaust gas and is a conventional setting for those skilled in the art, so it will not be described in detail here.

[0058] In some embodiments, the dry ice cleaning unit 40 may be configured as follows: Figures 6 to 8 The structure shown. Figures 6 to 8 The dry ice cleaning unit 40 includes a turning box 41 , a first transmission structure, a first adjustment structure 43 , a first upper conveyor belt 44 , a first lower conveyor belt 45 and a dry ice cleaning structure 46 .

[0059] Specifically, the flip box 41 is rotatably arranged in the cylindrical cavity 11, and a connecting shaft 412 is provided on both sides of the flip box 41, which is colinear with the axis of the cylindrical cavity 11 and extends out. The two connecting shafts 412 are both rotatably connected to the vertical box body 10. The flip box 41 has a through cavity 411 that radially passes through both ends along the connecting shaft 412, and the through cavity 411 is a clean space. The through cavity 411 has a length direction that is in the same direction as the through direction, a width direction that is in the same direction as the axis of the connecting shaft 412, and a height direction that is perpendicular to the length direction and the width direction. There are two groups of first transmission structures, and the two groups of first transmission structures are spaced apart along the height direction. Each group of first transmission structures includes two first rotating shafts 42 spaced apart along the length direction. Each first rotating shaft 42 is arranged along the width direction and is rotatably connected to the flip box 41. Each first transmission structure is connected to a first driver 47. Two first adjustment structures 43 are provided, one on each side of the through-cavity 411 along the width direction. Each first adjustment structure 43 has a mounting portion that faces the other first adjustment structure 43 and is movable along the width direction. Two first upper conveyor belts 44 are provided, one on each mounting portion and dynamically connected to the two first rotating shafts 42 in one set of first transmission structures. Two first lower conveyor belts 45 are provided, one on each mounting portion and dynamically connected to the two first rotating shafts 42 in the other set of first transmission structures. A limited transmission channel is formed between the two first lower conveyor belts 45 and the two first upper conveyor belts 44 along the length direction, clamping the two sides of the PCB. Two dry ice blasting structures 46 are provided, one on each side of the through-cavity 411 along the height direction, capable of spraying dry ice powder onto both surfaces of the PCB.

[0060] In this embodiment, the tilting box 41 is capable of pitching and rotating under the drive assembly 50, thereby enabling the through cavity 411 to simultaneously correspond to the inlet 13 and the outlet 14, or to correspond to the two vents 15. Two first upper conveyor belts 44 and two first lower conveyor belts 45, respectively provided on the two first transmission structures, can form a limited transmission channel. The two first upper conveyor belts 44 and the two first lower conveyor belts 45 correspond one-to-one. The corresponding first upper conveyor belts 44 and first lower conveyor belts 45 can clamp one side of the PCB circuit board between them, and the clamping direction is set along the normal direction of the PCB circuit board, thereby preventing components located on the PCB board from being squeezed during the transmission of the PCB circuit board, facilitating the protection of the PCB circuit board and ensuring the quality of the PCB circuit board.

[0061] The dry ice cleaning mechanism 46 primarily operates after the through-hole 411 is connected to the two vents 15, ensuring that generated carbon dioxide can be directly discharged through the vents 15 into the air passage 16, preventing carbon dioxide accumulation in the workshop. Furthermore, the two first upper conveyor belts 44 ensure that one surface of the PCB is exposed, while the two first lower conveyor belts 45 ensure that the other surface of the PCB is exposed. This ensures that both surfaces of the PCB correspond to the two dry ice cleaning mechanisms 46, ensuring the dry ice cleaning effect.

[0062] In addition, each first transmission structure includes two first rotating shafts 42, which can ensure that a certain space is formed between the two first rotating shafts 42 to avoid blocking the dry ice powder sprayed by the dry ice cleaning structure 46, ensuring that the dry ice powder can directly act on the PCB circuit board.

[0063] The turning box 41 is rotatably mounted within the cylindrical cavity 11, ensuring its rotation. The through-cavity 411 of the turning box 41 ensures the transfer of PCBs while maintaining connectivity with the two vents. Two first adjustment structures 43 drive the two first upper conveyor belts 44 and the two first lower conveyor belts 45 to move relative to or away from each other, enabling the width of the limited transfer channel to be adjusted to accommodate PCBs of varying specifications, demonstrating strong adaptability.

[0064] In this embodiment, regarding the rotation connection of the turnover box 41, fixed plates can be provided at both ends of the cylindrical cavity 11, and rotating holes are provided on the fixed plates. The rotating holes are rotatably connected to the two connecting shafts 412 through rolling bearings. Figure 2 .

[0065] In addition, in order to facilitate the placement of the dry ice cleaning unit 40 in the barrel cavity 11, both ends of the barrel cavity 11 can pass through the vertical box body 10, and a sealing cover 12 that can be detachably connected to the vertical box body 10 is provided. Figure 1 .

[0066] In some embodiments, the above-mentioned turning box 41 can be used as follows Figures 3 to 6 The structure shown. Figures 3 to 6 Both ends of the flip box 41 are provided with arc-shaped sliding parts adapted to the side walls of the cylindrical cavity 11. This structure can ensure smooth contact between the flip box 41 and the side walls of the cylindrical cavity 11, thereby ensuring the sealing effect of the through cavity 411.

[0067] In this embodiment, the arc-shaped sliding portion is mainly the annular abutting edge at the end of the flip box 41. Friction will be generated between the arc-shaped sliding portion and the inner wall of the cylindrical cavity 11. A graphene layer can be provided on the arc-shaped sliding portion to ensure wear resistance and sealing effect.

[0068] In some embodiments, the first rotating shaft 42 may be Figure 6 The structure shown. Figure 6 Each first rotating shaft 42 is a spline shaft. The setting of the spline shaft can ensure the driving of the first upper conveyor belt 44 and the first lower conveyor belt 45, and at the same time can ensure the sliding connection between the first upper conveyor belt 44 and the first lower conveyor belt 45.

[0069] Moreover, the first rotating shaft 42 is rotatably arranged on the flip box 41 , which can ensure that the first driver 47 is located outside the flip box 41 , thereby avoiding the driving occupying the through cavity 411 and ensuring the space utilization of the through cavity 411 .

[0070] In some embodiments, the first adjustment structure 43 may be configured as follows: Figure 8 The structure shown. Figure 8 Each first adjustment structure 43 includes a first sliding plate 431 and an adjustment screw 432. The first sliding plate 431 is slidably disposed within the through-cavity 411 along the width direction, with the mounting portion located on the first sliding plate 431. The adjustment screw 432 is disposed colinearly with the connecting shaft 412. The adjustment screw 432 is threadedly connected to a nut portion disposed within the connecting shaft 412, and one end of the adjustment screw 432 extends into the through-cavity 411 and is rotationally connected to the first sliding plate 431.

[0071] By rotating the adjustment screw 432, the sliding movement of the first sliding plate 431 can be adjusted, thereby ensuring that the spacing between the two first sliding plates 431 can be adjusted, and thus the width of the position-limiting transmission channel can be adjusted to accommodate PCBs of different specifications. Furthermore, the two first sliding plates 431 can also limit the position of the PCB in the width direction, ensuring the stability of the PCB when it is in the position-limiting clamping channel.

[0072] Specifically, a first guide rod is provided in the through-hole 411 to limit the sliding movement of the first sliding plate 431. The first sliding plate 431 is provided with a first through-hole for the first rotating shaft 42 to pass through. The first guide rod ensures support for the first sliding plate 431 while ensuring smooth sliding of the first sliding plate 431. The first through-hole prevents interference with the first rotating shaft 42.

[0073] Specifically, the connecting shaft 412 has an axial hole communicating with the through cavity 411 , and the nut portion is located at one end of the axial hole close to the through cavity 411 . The nut portion is mainly capable of ensuring threaded connection with the adjusting screw 432 .

[0074] In this embodiment, because the shaft hole has a certain depth, the adjustment range of the adjusting screw 432 is consistent with the adjustment depth of the shaft hole, so that the nut end of the adjusting screw 432 can be hidden in the shaft hole, avoiding interference between the adjusting screw 432 and the sealing cover 12 set on the vertical box body 10.

[0075] As an implementation method of this embodiment, the structure of each first upper conveyor belt 44 and each first lower conveyor belt 45 can be the same. Specifically, taking the first upper conveyor belt 44 as an example, the first upper conveyor belt 44 can include a plurality of pulleys spaced apart along the length direction and a belt sleeved around the outer periphery of each pulley. Each pulley is rotatably connected to a corresponding first sliding plate 431, and the rotation axis is arranged along the width direction. The pulleys at both ends along the length direction are provided with spline holes, which can be respectively connected to the two first rotating shafts 42 in power and can be slidably connected to the first rotating shafts 42. This ensures that the first sliding plate 431 can adjust the movement of the first upper conveyor belt 44.

[0076] In some embodiments, the dry ice cleaning structure 46 may be configured as follows: Figure 7 See the structure shown. Figure 7 Each dry ice blasting structure 46 includes a fixed base 461 and a nozzle 462. The fixed base 461 is mounted on the inner wall of the through-hole chamber 411 and defines a material guide cavity that communicates with an external dry ice supply device. Multiple nozzles 462 are provided, each uniformly distributed on the fixed base 461 and connected to the material guide cavity. Each nozzle 462 has a nozzle opening facing the limited transfer channel.

[0077] The fixing seat 461 can ensure the connection of multiple nozzles 462 and can also ensure the supply of materials to the multiple nozzles 462. The fixing seat 461 can be connected to an external dry ice supply device through a flexible pipeline to ensure the dry ice blasting operation.

[0078] In some embodiments, the drive assembly 50 may be configured as follows: Figure 4 and Figure 6 See the structure shown. Figure 4 and Figure 6The drive assembly 50 includes a shaft seat 51, a power shaft 52, a first sprocket 53, a second sprocket 54, a transmission chain 56, and a second driver 55. The shaft seat 51 is arranged in the vertical box body 10. The power shaft 52 is rotatably arranged on the shaft seat 51 along the width direction, and its two ends extend out of the shaft seat 51. There are two first sprockets 53, and the two first sprockets 53 are respectively arranged at the two ends of the power shaft 52. There are two second sprockets 54, and the two second sprockets 54 are respectively arranged on the two connecting shafts 412, and the two second sprockets 54 are arranged in a one-to-one correspondence with the two first sprockets 53. There are two transmission chains 56, and each transmission chain 56 is annularly sleeved on the outer circumference of the corresponding first sprocket 53 and second sprocket 54. The second driver 55 is arranged on the shaft seat 51 and is power-connected to the power shaft 52.

[0079] The power shaft 52 is driven to rotate by the second driver 55 , and the turnover box 41 is driven to pitch and rotate by the two first sprockets 53 , the two second sprockets 54 and the two transmission chains 56 . The structure is simple and easy to control.

[0080] The second driver 55 may be a servo motor or a stepping motor.

[0081] As an implementation method of this embodiment, two limit blocks can be set on the side wall of the cylindrical cavity 11, and the two limit blocks are used to limit the pitch rotation position of the flip box 41 to ensure that the flip cavity is connected with the inlet 13 and the outlet 14, or is stably connected with the two ventilation ports 15.

[0082] In some embodiments, see Figure 5 The dry ice cleaning device for PCB circuit boards also includes an air jet assembly 60, which is arranged at one of the vents 15. The air jet assembly 60 includes an air nozzle 61 and a flip plate 62; there are multiple air nozzles 61, each of which is evenly arranged in a corresponding air passage 16, and each of which can be connected to an external pressure pump. The flip plate 62 is arranged in the air passage 16 along the vertical direction, and the top of the flip plate 62 is rotatably connected to the vertical box 10. After the dry ice cleaning structure 46 completes the spraying of dry ice powder and the air nozzle 61 sprays air, the flip plate 62 can be rotated upward to block the corresponding air passage 16.

[0083] When the dry ice cleaning structure sprays dry ice powder onto the two surfaces of the PCB, the sublimation process takes time and is relatively slow. In addition, the carbon dioxide gas generated by sublimation cannot be discharged from the vents 15 and the air passages 16 in a timely manner.

[0084] The jet assembly 60 is configured to blow pure air into the clean space through multiple air nozzles 61. The generated airflow passes through the surface of the PCB circuit board and comes into contact with the dry ice powder, achieving heat exchange, which can ensure the rapid sublimation of the dry ice powder, thereby improving the cleaning efficiency of the PCB circuit board. Because each air nozzle 61 is disposed in the air passage 16, in order to ensure the flow rate of the airflow and prevent the gas ejected from the air nozzle 61 from directly flowing out of the air passage 16, the provided flip plate 62 can effectively block the air passage 16 corresponding to one of the vents 15, and only when the air nozzle 61 is working, it is blown by the air nozzle 61 and tilted upward to block the corresponding air passage 16. After the air nozzle 61 stops ejecting air, it is tilted downward to a vertical position due to its own gravity to open the air passage 16.

[0085] In order to ensure the stability of the flip plate 62, a magnetic block can be set at the bottom end of the flip plate 62, and an iron block that can be attracted by the magnetic block is set on the inner wall of the air outlet channel 16 to ensure the stability of the flip plate 62 when it is flipped to a vertical setting.

[0086] The air passage 16 may include two branch channels, which correspond to the two vents 15 one by one, and both branch channels may be connected to the exhaust pipe. A filter assembly may be provided in the branch channel to ensure that the passing gas is filtered.

[0087] In some embodiments, the loading unit 20 may be configured as follows: Figure 1 、 Figure 2 and Figure 9 The structure shown. Figure 1 、 Figure 2 and Figure 9 The loading unit 20 has a loading channel that can clamp the two opposite side edges of the PCB circuit board in the normal direction and corresponds to the limiting transmission channel.

[0088] By clamping the two opposite sides of the PCB through the loading channel, the PCB can be prevented from being damaged. At the same time, this loading method can avoid contact with components on the PCB, preventing the components from being scratched, thereby protecting the PCB.

[0089] Specifically, the spacing direction between the inlet 13 and the outlet 14 is set as the first direction, and the axial direction of the cylindrical cavity 11 is set as the second direction.

[0090] The loading unit 20 may include a bottom box seat 21 connected to the vertical box body 10, two vertical plates 22 located on the bottom box seat 21 and spaced apart along the second direction, two second sliding plates 23 sliding between the two vertical plates 22 along the second direction, a second adjustment structure powered by the two second sliding plates 23, second upper conveyor belts 26 respectively arranged on the two second sliding plates 23, second lower conveyor belts 27 respectively arranged on the two second sliding plates 23, an upper driving member powered by the two second upper conveyor belts 26, and a lower driving member powered by the two second lower conveyor belts 27.

[0091] The two second upper conveyor belts 26 correspond to the two second lower conveyor belts 27 in a one-to-one manner, forming a loading channel between the two. The length of the two second upper conveyor belts 26 can be shorter than the length of the two lower conveyor belts to ensure that the PCB circuit boards can be easily placed on the end of the second lower conveyor belts 27 away from the vertical box 10.

[0092] The upper and lower drive members have the same structure, both including a plurality of second rotating shafts 28 spaced apart along the first direction and a third driver 29. The plurality of second rotating shafts 28 are all rotatably disposed along the second direction on the two vertical plates 22. The second rotating shafts 28 are also splined shafts.

[0093] The structure of each second upper conveyor belt 26 and each second lower conveyor belt 27 can be identical. Specifically, taking the second upper conveyor belt 26 as an example, the second upper conveyor belt 26 can include a plurality of pulleys spaced apart along the length direction and a belt sleeved around the outer periphery of each pulley. Each pulley is rotatably connected to a corresponding second sliding plate 23, and the rotation axis is arranged along the width direction. The pulleys at both ends along the length direction are provided with spline holes, which can be respectively connected to the two second rotating shafts 28 for power and sliding connection. This ensures that the second sliding plate 23 can adjust the movement of the second upper conveyor belt 26, thereby ensuring that it can accommodate PCB circuit boards of different specifications.

[0094] The second adjustment structure may include a bidirectional screw 24 and an adjustment driver 25 . The bidirectional screw 24 is rotatable along the second direction and is arranged on the two vertical plates 22 . Both ends of the screw are respectively screw-fitted with the nut parts on the two second sliding plates 23 .

[0095] In some embodiments, the above-mentioned blanking unit 30 can be used as follows Figure 1 、 Figure 2 and Figure 9 See the structure shown. Figure 1 、 Figure 2 and Figure 9 The blanking unit 30 has a blanking channel that can clamp two opposite side edges of the PCB circuit board in the normal direction and corresponds to the limit transmission channel.

[0096] By clamping the two opposite sides of the PCB through the blanking channel, the PCB can be prevented from being clamped and damaged. At the same time, this blanking method can avoid contact with components on the PCB, preventing the components from being scratched, thereby protecting the PCB.

[0097] Specifically, the unloading unit 30 may have the same structure as the loading unit 20 . During actual installation, the unloading unit 30 may be symmetrically arranged with the loading unit 20 along the vertical plane where the axis of the barrel cavity 11 is located, which will not be elaborated here.

[0098] In addition, as an embodiment of the present invention, a display control unit can be provided, which is electrically connected to the loading unit 20, the unloading unit 30, the dry ice cleaning unit 40, the driving assembly 50 and the jet assembly 60 respectively to ensure that they perform the cleaning work in a coordinated and stable manner.

[0099] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dry ice cleaning device for PCB circuit boards, characterized in that: include: A vertical box (10) has a cylindrical cavity (11) with a horizontal axis. An inlet (13) and an outlet (14) are provided on the side wall of the cylindrical cavity (11) and pass through the vertical box (10) in a horizontal direction. Two opposite vents (15) are also provided on the side wall of the cylindrical cavity (11); a line connecting the inlet (13) and the outlet (14) and a line connecting the two vents (15) are arranged at an angle; and an air passage (16) is provided in the vertical box (10) and communicates with the two vents (15). A loading unit (20) is provided on one side of the vertical box (10) and has a feeding end corresponding to the inlet (13); A discharge unit (30) is provided on the other side of the vertical box (10) and has a discharge end corresponding to the outlet (14); A dry ice cleaning unit (40) is rotatably disposed in the cylindrical cavity (11), and has a cleaning space that can be communicated with the inlet (13) and the outlet (14), or with the two vents (15), wherein the cleaning space is provided with a position limiting transmission channel for clamping two opposite side edges of the PCB in a normal direction thereof; A drive assembly (50) is disposed in the vertical box (10) and is dynamically connected to the dry ice cleaning unit (40), and is used to drive the dry ice cleaning unit (40) to pitch and rotate, so that the cleaning space is connected to the inlet (13) and the outlet (14), or to the two vents (15).

2. The dry ice cleaning device for PCB circuit boards according to claim 1, characterized in that: The dry ice cleaning unit (40) comprises: A flip box (41) is rotatably arranged in the cylindrical cavity (11), and connecting shafts (412) are respectively provided on both sides of the flip box (41) and are collinear with the axis of the cylindrical cavity (11) and extend outward, and the two connecting shafts (412) are both rotatably connected to the vertical box body (10); the flip box (41) has a through cavity (411) radially penetrating both ends along the connecting shaft (412), and the through cavity (411) is the cleaning space; the through cavity (411) has a length direction in the same direction as the through direction, a width direction in the same direction as the axis of the connecting shaft (412), and a height direction perpendicular to the length direction and the width direction; The first transmission structure is provided with two groups, the two groups of the first transmission structures are spaced apart along the height direction, each group of the first transmission structures comprises two first rotating shafts (42) spaced apart along the length direction, each first rotating shaft (42) is arranged along the width direction and is rotationally connected to the turnover box (41); each first transmission structure is connected to a first driver (47); Two first adjustment structures (43) are provided, and the two first adjustment structures (43) are respectively arranged on both sides of the through cavity (411) along the width direction, and each first adjustment structure (43) has a mounting portion arranged toward the other first adjustment structure (43) and movable along the width direction; Two first upper conveyor belts (44) are provided, and the two first upper conveyor belts (44) are respectively arranged on the two mounting parts and are dynamically connected to the two first rotating shafts (42) in one set of the first transmission structures; Two first lower conveyor belts (45) are provided, and the two first lower conveyor belts (45) are respectively arranged on the two mounting parts and are dynamically connected to the two first rotating shafts (42) in the other group of the first transmission structure. The two first lower conveyor belts (45) and the two first upper conveyor belts (44) form the limiting transmission channel arranged along the length direction and clamping the two side edges of the PCB circuit board; Two dry ice cleaning structures (46) are provided, and the two dry ice cleaning structures (46) are respectively arranged on both sides of the through cavity (411) along the height direction, and are used to spray dry ice powder onto the two surfaces of the PCB circuit board respectively.

3. The dry ice cleaning device for PCB circuit board according to claim 2, characterized in that: Both ends of the turnover box (41) are provided with arc-shaped sliding parts adapted to the side walls of the cylindrical cavity (11).

4. The dry ice cleaning device for PCB circuit boards according to claim 2, characterized in that: The first rotating shafts (42) are all spline shafts.

5. The dry ice cleaning device for PCB circuit board according to claim 4, characterized in that: The first regulating structure (43) comprises: a first sliding plate (431) slidably disposed in the through cavity (411) along the width direction, the mounting portion being located on the first sliding plate (431); an adjusting screw (432) arranged colinearly with the connecting shaft (412), the adjusting screw (432) being threadedly connected to a nut portion arranged in the connecting shaft (412), one end of the adjusting screw (432) extending into the through cavity (411), and being rotatably connected to the first sliding plate (431); The through cavity (411) is provided with a first guide rod for limiting the sliding of the first sliding plate (431); the first sliding plate (431) is provided with a first through hole for the first rotating shaft (42) to pass through; The connecting shaft (412) has an axial hole communicating with the through cavity (411), and the nut portion is located at one end of the axial hole close to the through cavity (411).

6. The dry ice cleaning device for PCB circuit boards according to claim 2, characterized in that: The dry ice cleaning structure (46) includes: A fixing seat (461) is arranged on the inner wall of the through cavity (411) and has a material guide cavity connected to an external dry ice supply device; There are multiple nozzles (462), each of which is evenly distributed on the fixing seat (461) and communicated with the material guide cavity. Each of the nozzles (462) has a nozzle facing the position-limiting transfer channel.

7. The dry ice cleaning device for PCB circuit boards according to claim 2, characterized in that: The drive assembly (50) comprises: An axle seat (51) is arranged in the vertical box (10); A power shaft (52) is rotatably disposed on the shaft seat (51) along the width direction, with both ends extending out of the shaft seat (51); Two first sprockets (53) are provided, and the two first sprockets (53) are respectively arranged at two ends of the power shaft (52); Two second sprockets (54) are provided, and the two second sprockets (54) are respectively arranged on the two connecting shafts (412), and the two second sprockets (54) are arranged in a one-to-one correspondence with the two first sprockets (53); Two transmission chains (56) are provided, and each transmission chain (56) is annularly sleeved on the outer periphery of the corresponding first sprocket (53) and the second sprocket (54); The second driver (55) is arranged on the shaft seat (51) and is connected to the power shaft (52) in a power manner.

8. The dry ice cleaning device for a PCB circuit board according to any one of claims 2 to 7, characterized in that: It also includes an air jet assembly (60), which is arranged at one of the vents (15); the air jet assembly (60) includes: There are multiple air nozzles (61), each of which is evenly arranged in the corresponding air passage (16), and each of which is used to communicate with an external pressure pump; A flip plate (62) is arranged in the air passage (16) along the vertical direction, and the top end of the flip plate (62) is rotatably connected to the vertical box (10). The flip plate (62) is used to rotate upward in pitch when the dry ice cleaning structure (46) completes spraying of dry ice powder and the air nozzle (61) sprays air, so as to block the corresponding air passage (16).

9. The dry ice cleaning device for a PCB circuit board according to any one of claims 2 to 7, characterized in that: The loading unit (20) has a loading channel for clamping two opposite side edges of the PCB circuit board in the normal direction and corresponding to the position limiting transmission channel.

10. The dry ice cleaning device for PCB circuit board according to claim 9, characterized in that: The blanking unit (30) has a blanking channel for clamping two opposite side edges of the PCB circuit board in the normal direction and corresponding to the position limiting transmission channel.

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