Cleaning apparatus for PCBs with holes and method of operation thereof

Abstract

The application belongs to the technical field of printed circuit, and particularly relates to a cleaning equipment for PCB with holes and a working method thereof. The cleaning equipment for PCB with holes comprises a conveying belt for conveying the PCB and making the PCB parallel to the conveying direction; and a plurality of limiting mechanisms uniformly arranged on the conveying surface of the conveying belt along the conveying direction. The limiting mechanism comprises four elastic limiting wheels arranged in an inverted trapezoidal shape and forming an upper opening placement position. The wheel surface of the elastic limiting wheel has an annular limiting groove with adjustable width. The cleaning equipment for PCB with holes and the working method thereof limit the PCB by using the limiting mechanism with the elastic limiting wheel, so that the two elastic limiting wheels located below are pushed to shrink the annular limiting groove by the corresponding first limiting member during the process of passing through the low-pressure cleaning module, so that the PCB is deflected, the line contact between the elastic limiting wheel and the PCB is realized, and the water flow can directly flush onto the inner wall of the through hole.

Description

Technical Field

[0001] This invention belongs to the field of printed circuit technology, specifically relating to the cleaning or polishing of conductive patterns, and particularly to a cleaning device for PCB boards with holes and its working method. Background Technology

[0002] Printed circuit boards, also known as PCBs, are the support structures for electronic components. During the manufacturing process, holes need to be drilled in the PCB to create the required openings, and the board then undergoes a cleaning process.

[0003] For example, an automatic PCB cleaning mechanism with patent number "CN224218601U" clamps the surface of the PCB board through a clamping mechanism and drives the PCB board through the cleaning station to complete the cleaning of the PCB board.

[0004] However, because the clamping mechanism clamps the surface of the PCB board, the clamping surface of the PCB board cannot be cleaned. At the same time, the direction of the water jet is parallel to the inner wall of the through hole on the PCB board, resulting in insufficient cleaning force of the water jet on the inner wall of the through hole.

[0005] Therefore, how to solve the above two problems at the same time is a problem that urgently needs to be solved by those skilled in the art.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0007] This disclosure provides at least one cleaning device for perforated PCB boards and its working method.

[0008] In a first aspect, embodiments of this disclosure provide a cleaning device for perforated PCB boards, comprising: a conveyor belt for conveying PCB boards and ensuring the PCB boards are parallel to the conveying direction; a plurality of limiting mechanisms uniformly disposed on the conveying surface of the conveyor belt along the conveying direction, the limiting mechanisms comprising: four elastic limiting wheels arranged in an inverted trapezoidal shape and forming an upper opening placement position, the wheel surface of the elastic limiting wheels having an annular limiting groove with an adjustable width; and a low-pressure cleaning module comprising: a pair of first limiting members and at least a pair of low-pressure cleaning nozzles, wherein both first limiting members and both low-pressure cleaning nozzles are... The low-pressure cleaning nozzles are arranged on both sides of the conveyor belt along the conveying direction, and the spraying direction of the low-pressure cleaning nozzles is perpendicular to the conveying direction. The initial width H1 of the annular limiting groove is greater than the thickness H2 of the PCB board. During the process of the limiting mechanism driving the PCB board through the low-pressure cleaning module, the elastic limiting wheel located below abuts against the corresponding first limiting member and retracts inward. By reducing the width of the annular limiting groove, the PCB board is tilted relative to the conveying direction, so that the elastic limiting wheel makes line contact with the PCB board while the inner wall of the through hole on the PCB board forms an inclined cleaning angle with the rinsing direction of the low-pressure cleaning nozzle.

[0009] In one optional embodiment, the two first limiting members are staggered in the conveying direction; wherein, during the process of the limiting mechanism driving the PCB board through the low-pressure cleaning module, when one of the first limiting members abuts against the elastic limiting wheel located below and in front of the conveying direction, the other first limiting member simultaneously abuts against the elastic limiting wheel located below and in the rear of the conveying direction, so that the PCB board is tilted relative to the conveying direction.

[0010] In one optional embodiment, the cleaning equipment for perforated PCB boards further includes a high-pressure rinsing module, which includes a pair of second limiting members and at least a pair of high-pressure rinsing nozzles; wherein the two second limiting members and the two high-pressure rinsing nozzles are arranged on both sides of the conveyor belt along the conveying direction; during the process of the limiting mechanism driving the PCB board through the high-pressure rinsing module, the two second limiting members are adapted to push against four elastic limiting wheels to clamp the PCB board.

[0011] In one alternative embodiment, the resilient limiting wheel is connected to the conveyor belt via a pair of mounting brackets; the resilient limiting wheel includes a left half wheel and a right half wheel; wherein the left half wheel is adapted to be inserted into the right half wheel to form the resilient limiting wheel.

[0012] In one optional embodiment, the end face of the right half-wheel facing the left half-wheel has a receiving blind hole; the outer diameter of the left half-wheel is smaller than the inner diameter of the receiving blind hole; and the end of the left half-wheel facing the right half-wheel is adapted to be inserted into the receiving blind hole.

[0013] In one optional embodiment, both the outer ends of the left half wheel and the right half wheel have retaining rings; wherein, after the left half wheel is inserted into the right half wheel, the annular limiting groove is formed between the two retaining rings.

[0014] In one optional embodiment, the outer end face of the left half wheel and the outer end face of the right half wheel each have a mounting post; wherein the mounting post is adapted to pass through the mounting hole on the corresponding mounting bracket, and the outer end of the mounting post is provided with a limit cap; a return spring is sleeved on the mounting post, one end of the return spring abuts against the mounting bracket, and the other end abuts against the limit cap.

[0015] In one alternative implementation, the maximum adjustable width of the annular limiting groove is less than the thickness of the PCB board.

[0016] Secondly, this disclosure also provides a method for operating a cleaning device for a PCB board with holes, comprising: conveying the PCB board via a conveyor belt; limiting the PCB board via a limiting mechanism on the conveyor belt; vertically spraying cleaning fluid toward the PCB board through a low-pressure cleaning nozzle in a low-pressure cleaning module to clean the PCB board; and tilting the PCB board by pushing an elastic limiting wheel in the limiting mechanism with a first limiting member in the low-pressure cleaning module, thereby making the elastic limiting wheel in line contact with the PCB board and simultaneously forming an inclined cleaning angle between the inner wall of the through hole on the PCB board and the rinsing direction of the low-pressure cleaning nozzle.

[0017] In an optional embodiment, in the method of tilting the PCB board by pushing the elastic limiting wheel in the limiting mechanism with the first limiting member in the low-pressure cleaning module, the two first limiting members are staggered in the conveying direction, so that when one of the first limiting members abuts against the elastic limiting wheel located below and in front of the conveying direction during the process of the limiting mechanism driving the PCB board through the low-pressure cleaning module, the other first limiting member abuts against the elastic limiting wheel located below and in the rear of the conveying direction at the same time, so that the PCB board is tilted relative to the conveying direction.

[0018] The beneficial effects of this invention are that the cleaning equipment and its working method for PCB boards with holes use a limiting mechanism with elastic limiting wheels to limit the PCB board. During the process of the PCB board passing through the low-pressure cleaning module, the two elastic limiting wheels located below will shrink the annular limiting groove due to the push of the corresponding first limiting member, causing the PCB board to deflect. This results in line contact between the elastic limiting wheels and the PCB board, avoiding surface contact that could lead to cleaning residue. At the same time, the deflection of the PCB board causes the water jet direction to form an angle with the inner wall of the through hole, allowing the water to directly rinse the inner wall of the through hole.

[0019] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a cleaning device for perforated PCB boards provided in an embodiment of the present disclosure; Figure 2 This is a schematic diagram of a limiting mechanism provided in an embodiment of the present disclosure; Figure 3 This is a schematic diagram of the structure of a low-pressure cleaning module and a high-pressure flushing module provided in an embodiment of the present disclosure; Figure 4 This is a schematic diagram of the structure of an elastic limiting wheel when the PCB board is not tilted, provided in an embodiment of this disclosure; Figure 5 This is a schematic diagram of the structure of an elastic limiting wheel for tilting a PCB board, provided in an embodiment of this disclosure. Figure 6 A simplified diagram illustrating a vertical water flow rinsing an inclined PCB board, provided as an embodiment of this disclosure; Figure 7 A simplified diagram illustrating the use of inclined water flow to rinse a horizontal PCB board, as provided in this embodiment of the disclosure. Figure 8 This is a schematic diagram of the structure of an elastic limiting wheel provided in an embodiment of the present disclosure; Figure 9 This is a cross-sectional structural schematic diagram of an elastic limiting wheel provided in an embodiment of the present disclosure.

[0023] In the picture: 1. Conveyor belt; 2. Limiting mechanism; 21. Elastic limiting wheel; 210. Annular limiting groove; 211. Left half wheel; 212. Right half wheel; 2121. Accommodating blind hole; 213. Retaining ring; 214. Mounting post; 215. Limiting cap; 216. Return spring; 22. Upper opening placement position; 23. Mounting bracket; 3. Low-pressure cleaning module; 31. First limiting component; 32. Low-pressure cleaning nozzle; 4. High-pressure flushing module; 41. Second limit component; 42. High-pressure flushing nozzle; 5. PCB board. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the figures, the thickness of parts may be exaggerated or reduced for the purpose of effectively depicting the technical content.

[0026] Line contact: The edge fits against the surface.

[0027] Surface contact: Surfaces touching each other.

[0028] The cleaning equipment for PCB boards with holes includes: a conveyor belt 1, an acid pickling module, a high-pressure rinsing module 4, a low-pressure cleaning module 3, and a drying module. The conveyor belt 1 drives the PCB board 5 through the above modules in sequence to complete the cleaning.

[0029] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] like Figures 1 to 5 As shown, at least one embodiment provides a cleaning device for perforated PCB boards, including: a conveyor belt 1, a plurality of limiting mechanisms 2, and a low-pressure cleaning module 3.

[0031] Specifically, such as Figure 1 As shown, the conveyor belt 1 is used to transport the PCB board 5 and makes the PCB board 5 parallel to the transport direction F1.

[0032] Specifically, such as Figure 2As shown, several limiting mechanisms 2 are evenly arranged on the conveying surface of the conveyor belt 1 along the conveying direction F1; wherein, the limiting mechanism 2 includes: four elastic limiting wheels 21 arranged in an inverted trapezoidal shape and forming an upper opening placement position 22, the PCB board 5 is vertically placed in the upper opening placement position 22, and the wheel surface of the elastic limiting wheel 21 has an annular limiting groove 210 with adjustable width.

[0033] Specifically, such as Figure 3 As shown, the low-pressure cleaning module 3 includes: a pair of first limiting members 31 and at least a pair of low-pressure cleaning nozzles 32; wherein, the two first limiting members 31 and the two low-pressure cleaning nozzles 32 are arranged on both sides of the conveyor belt 1 along the conveying direction F1, and the spraying direction F2 of the low-pressure cleaning nozzles 32 is perpendicular to the conveying direction F1.

[0034] Specifically, such as Figure 4 , Figure 5 As shown, the initial width H1 of the annular limiting groove 210 is greater than the thickness H2 of the PCB board 5. During the process of the limiting mechanism 2 driving the PCB board 5 through the low-pressure cleaning module 3, the elastic limiting wheel 21 located below abuts against the corresponding first limiting member 31 and retracts inward. By reducing the width of the annular limiting groove 210, the PCB board 5 is tilted relative to the conveying direction F1. This causes the elastic limiting wheel 21 to make line contact with the PCB board 5, while the inner wall of the through hole 51 on the PCB board 5 forms an inclined cleaning angle with the rinsing direction of the low-pressure cleaning nozzle 32.

[0035] In this embodiment, the PCB board 5 is limited by a limiting mechanism 2 with elastic limiting wheels 21. During the process of passing through the low-pressure cleaning module 3, the two elastic limiting wheels 21 located below will deflect the PCB board 5 due to the pushing and contraction of the annular limiting groove 210 by the corresponding first limiting member 31. This causes the elastic limiting wheels 21 to make line contact with the PCB board 5, avoiding surface contact that would result in cleaning residue on the surface of the PCB board 5. At the same time, the deflection of the PCB board causes an angle between the water jet direction F2 and the inner wall of the through hole 51, allowing the water to directly rinse the inner wall of the through hole 51.

[0036] In some embodiments, the first limiting member 31 and the low-pressure cleaning nozzle 32 are fixedly mounted on the table of the cleaning equipment. The conveyor belt 1 drives the limiting mechanism 2 and the PCB board 5 inside the limiting mechanism 2 to move relative to the table, thereby completing the cleaning through the low-pressure cleaning module 3.

[0037] like Figure 4 As shown, in some embodiments, the two first limiting members 31 are staggered in the conveying direction F1.

[0038] Specifically, such as Figure 5As shown, during the process of the limiting mechanism 2 driving the PCB board 5 through the low-pressure cleaning module 3, when one first limiting member 31 abuts against the elastic limiting wheel 21 located below and in front of the conveying direction, another first limiting member 31 simultaneously abuts against the elastic limiting wheel 21 located below and in the rear of the conveying direction, so that the PCB board 5 is tilted relative to the conveying direction F1.

[0039] In this embodiment, when the through hole 51 is about to enter the cleaning area of ​​the low-pressure cleaning nozzle 32, the first limiting member 31 abuts against the corresponding elastic limiting wheel 21 to make the PCB board 5 tilted relative to the conveying direction F1, so that the low-pressure cleaning nozzle 32 can rinse the inner wall of the through hole 51.

[0040] In some embodiments, the specific structure of the low-pressure cleaning nozzle 32 is the prior art; optionally, the low-pressure cleaning nozzle 32 has a plurality of water outlet holes arranged vertically, so that the cleaning area of ​​the low-pressure cleaning nozzle 32 is a vertically arranged elongated strip, thereby enabling the entire surface of the PCB board 5 to be cleaned when it passes through the cleaning area.

[0041] like Figure 3 As shown, in some embodiments, the cleaning equipment for perforated PCB boards further includes a high-pressure rinsing module 4; wherein the high-pressure rinsing module 4 includes a pair of second limiting members 41 and at least a pair of high-pressure rinsing nozzles 42.

[0042] Specifically, the two second limiting members 41 and the two high-pressure rinsing nozzles 42 are arranged on both sides of the conveyor belt 1 along the conveying direction F1; during the process of the limiting mechanism 2 driving the PCB board 5 through the high-pressure rinsing module 4, the two second limiting members 41 are adapted to push against the four elastic limiting wheels 21 to clamp the PCB board 5.

[0043] In this embodiment, the high-pressure flushing module 4 is located upstream of the low-pressure cleaning module 3. Since the high-pressure flushing module 4 has a large impact force, a pair of second limiting members 41 are provided so that when the PCB board 5 passes through the high-pressure flushing module 4, it pushes against the four elastic limiting wheels 21 to clamp the PCB board 5.

[0044] In some embodiments, the specific structure of the high-pressure rinsing nozzle 42 is the prior art; optionally, the high-pressure rinsing nozzle 42 has a plurality of water outlet holes arranged vertically, so that the cleaning area of ​​the high-pressure rinsing nozzle 42 is a vertically arranged elongated strip, thereby enabling the entire surface of the PCB board 5 to be cleaned when it passes through the cleaning area.

[0045] In some embodiments, the width of the annular limiting groove 210 at the low-pressure cleaning module 3 is greater than the width at the high-pressure rinsing module 4; and the elastic limiting wheel 21 is pushed on only one side at the low-pressure cleaning module 3, while it is pushed on both sides at the high-pressure rinsing module 4.

[0046] like Figure 6 As shown, in this embodiment, the PCB board 5 is tilted relative to the conveying direction F1 at the low-pressure cleaning module 3, so that the low-pressure cleaning nozzles 32 on both sides can rinse the inner walls of both sides of the through hole 51; and as Figure 7 As shown in (a), the related technology uses an inclined spray method, which can only clean the inner wall of one side of the through hole 51; while as Figure 7 As shown in (b), if a multi-angle spraying method is used, the cleaning fluid will be sprayed onto the already cleaned PCB board 5, causing contamination.

[0047] like Figure 8 As shown, in some embodiments, the elastic limiting wheel 21 is connected to the conveying surface of the conveyor belt 1 via a pair of mounting brackets 23; specifically, the elastic limiting wheel 21 includes a left half wheel 211 and a right half wheel 212; the left half wheel 211 is adapted to be inserted into the right half wheel 212 to form the elastic limiting wheel 21.

[0048] like Figure 9 As shown, in some embodiments, the end face of the right half wheel 212 facing the left half wheel 211 is provided with a receiving blind hole 2121; the outer diameter of the left half wheel 211 is smaller than the inner diameter of the receiving blind hole 2121; the end of the left half wheel 211 facing the right half wheel 212 is adapted to be inserted into the receiving blind hole 2121.

[0049] like Figure 9 As shown, in some embodiments, the outer ends of both the left half-wheel 211 and the right half-wheel 212 have retaining rings 213; wherein, after the left half-wheel 211 is inserted into the right half-wheel 212, an annular limiting groove 210 is formed between the two retaining rings 213. In this embodiment, the width H3 of the right half-wheel 212 is less than the thickness of the PCB board 5, so that the PCB board 5 can be clamped at the high-pressure flushing module 4.

[0050] like Figure 9 As shown, in some embodiments, the maximum adjustable width of the annular limiting groove 210 is less than the thickness of the PCB board 5. In this embodiment, the maximum adjustable width H4 of the elastic limiting wheel 21 after installation is less than the thickness of the PCB board 5, to prevent the PCB board 5 from getting stuck in the notch.

[0051] Optionally, the thickness H2 of the PCB board 5 is 6mm, the width H3 of the right half wheel 212 is 5mm, and the maximum adjustable width H4 of the annular limiting groove 210 is 3mm; at the high-pressure flushing module 4, both the left half wheel 211 and the right half wheel 212 of the elastic limiting wheel 21 are pressed and moved by 1mm; at the low-pressure cleaning module 3, either the left half wheel 211 or the right half wheel 212 of the elastic limiting wheel 21 is pressed and moved by 1mm.

[0052] In some embodiments, the outer end face of the left half wheel 211 and the outer end face of the right half wheel 212 both have mounting posts 214; wherein the mounting posts 214 are adapted to pass through the mounting holes on the corresponding mounting brackets 23, and the outer end of the mounting posts 214 is provided with limit caps 215; a return spring 216 is sleeved on the mounting posts 214, one end of the return spring 216 abuts against the mounting brackets 23, and the other end abuts against the limit caps 215.

[0053] Optionally, the connecting end of the limit cap 215 is threadedly connected to the mounting post 214.

[0054] At least one embodiment also provides a method of operating a cleaning device for a perforated PCB board, comprising: conveying a PCB board 5 via a conveyor belt 1; limiting the PCB board 5 via a limiting mechanism 2 on the conveyor belt 1; vertically spraying cleaning fluid toward the PCB board 5 via a low-pressure cleaning nozzle 32 in a low-pressure cleaning module 3 to clean the PCB board 5; and tilting the PCB board 5 by pushing the elastic limiting wheel 21 in the limiting mechanism 2 with a first limiting member 31 in the low-pressure cleaning module 3, thereby making the elastic limiting wheel 21 in line contact with the PCB board 5 while simultaneously forming an inclined cleaning angle between the inner wall of the through hole 51 on the PCB board 5 and the rinsing direction of the low-pressure cleaning nozzle 32.

[0055] For the specific structure and implementation process of the cleaning equipment for PCBs with holes, please refer to the relevant discussion in the above embodiments, which will not be repeated here.

[0056] In some embodiments, in the method of tilting the PCB board 5 by pushing the elastic limiting wheel 21 in the limiting mechanism 2 with the first limiting member 31 in the low-pressure cleaning module 3, the two first limiting members 31 are staggered in the conveying direction F1, so that when one first limiting member 31 abuts against the elastic limiting wheel 21 located below and in front of the conveying direction during the process of the limiting mechanism 2 driving the PCB board 5 through the low-pressure cleaning module 3, the other first limiting member 31 abuts against the elastic limiting wheel 21 located below and in the rear of the conveying direction at the same time, so that the PCB board 5 is tilted in the conveying direction F1.

[0057] In summary, this cleaning equipment and its working method for PCB boards with holes uses a limiting mechanism 2 with elastic limiting wheels 21 to limit the PCB board 5. During the process of the PCB board 5 passing through the low-pressure cleaning module 3, the two elastic limiting wheels 21 located below will shrink the annular limiting groove 210 due to the pushing of the corresponding first limiting member 31, causing the PCB board 5 to deflect. This results in line contact between the elastic limiting wheels 21 and the PCB board 5, avoiding surface contact that would leave cleaning residue on the surface of the PCB board 5. At the same time, the deflection of the PCB board causes an angle between the water jet direction F2 and the inner wall of the through hole 51, allowing the water to directly rinse the inner wall of the through hole 51.

[0058] In this document, when it is said that the first component is located on the second component, this can mean that the first component can be directly formed on the second component, or that the third component can be inserted between the first component and the second component.

[0059] In this document, when an element or layer is referred to as being “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be an intermediate element or layer.

[0060] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0061] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the apparatus in use or operation.

[0062] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A cleaning device for PCB boards with holes, characterized in that, include: A conveyor belt (1) is used to transport PCB board (5) and to make PCB board (5) parallel to the transport direction; Several limiting mechanisms (2) are evenly arranged on the conveying surface of the conveyor belt (1) along the conveying direction. The limiting mechanism (2) includes: four elastic limiting wheels (21) arranged in an inverted trapezoidal shape and forming an upper opening placement position (22). The wheel surface of the elastic limiting wheel (21) has an annular limiting groove (210) with adjustable width. A low-pressure cleaning module (3) includes: a pair of first limiting members (31) and at least a pair of low-pressure cleaning nozzles (32), wherein the two first limiting members (31) and the two low-pressure cleaning nozzles (32) are arranged on both sides of the conveyor belt (1) along the conveying direction, and the spraying direction of the low-pressure cleaning nozzles (32) is perpendicular to the conveying direction; wherein The initial width H1 of the annular limiting groove (210) is greater than the thickness H2 of the PCB board (5); During the process of the limiting mechanism (2) driving the PCB board (5) through the low-pressure cleaning module (3), the elastic limiting wheel (21) located below abuts against the corresponding first limiting component (31) and retracts inward. By reducing the width of the annular limiting groove (210), the PCB board (5) is tilted relative to the conveying direction. This causes the elastic limiting wheel (21) to make line contact with the PCB board (5) while the inner wall of the through hole (51) on the PCB board (5) forms an inclined cleaning angle with the rinsing direction of the low-pressure cleaning nozzle (32).

2. The cleaning equipment for PCB boards with holes as described in claim 1, characterized in that, The two first limiting members (31) are staggered in the conveying direction; wherein During the process of the limiting mechanism (2) driving the PCB board (5) through the low-pressure cleaning module (3), when one of the first limiting members (31) abuts against the elastic limiting wheel (21) located below and in front of the conveying direction, the other first limiting member (31) abuts against the elastic limiting wheel (21) located below and in the rear of the conveying direction, so that the PCB board (5) is tilted relative to the conveying direction.

3. The cleaning equipment for PCB boards with holes as described in claim 1, characterized in that, Also includes: The high-pressure flushing module (4) includes: a pair of second limiting members (41) and at least a pair of high-pressure flushing nozzles (42); in The two second limiting members (41) and the two high-pressure flushing nozzles (42) are both arranged on both sides of the conveyor belt (1) along the conveying direction; During the process of the limiting mechanism (2) driving the PCB board (5) through the high-pressure flushing module (4), the two second limiting members (41) are adapted to push against the four elastic limiting wheels (21) to clamp the PCB board (5).

4. The cleaning equipment for PCB boards with holes as described in claim 2 or 3, characterized in that, The elastic limiting wheel (21) is connected to the conveyor belt (1) via a pair of mounting brackets (23); The elastic limiting wheel (21) includes: a left half wheel (211) and a right half wheel (212); wherein The left half wheel (211) is adapted to be inserted into the right half wheel (212) to form a resilient limiting wheel (21).

5. The cleaning equipment for PCB boards with holes as described in claim 4, characterized in that, The right half wheel (212) has a blind hole (2121) on its end face facing the left half wheel (211). The outer diameter of the left half-wheel (211) is smaller than the inner diameter of the receiving blind hole (2121); The end of the left half-wheel (211) facing the right half-wheel (212) is adapted to be inserted into a receiving blind hole (2121).

6. The cleaning equipment for PCB boards with holes as described in claim 5, characterized in that, The outer ends of the left half wheel (211) and the right half wheel (212) each have a retaining ring (213). Wherein, after the left half wheel (211) is inserted into the right half wheel (212), the annular limiting groove (210) is formed between the two retaining rings (213).

7. The cleaning equipment for PCB boards with holes as described in claim 6, characterized in that, The outer end face of the left half-wheel (211) and the outer end face of the right half-wheel (212) both have mounting posts (214); wherein The mounting post (214) is adapted to pass through the mounting hole on the corresponding mounting bracket (23), and the outer end of the mounting post (214) is provided with a limit cap (215). A reset spring (216) is fitted on the mounting post (214). One end of the reset spring (216) abuts against the mounting bracket (23), and the other end abuts against the limit cap (215).

8. The cleaning equipment for PCB boards with holes as described in claim 7, characterized in that, The maximum adjustable width of the annular limiting groove (210) is less than the thickness of the PCB board (5).

9. A method of operating the cleaning equipment for perforated PCB boards as described in any one of claims 1-8, characterized in that, include: PCB board (5) is conveyed by conveyor belt (1); The PCB board (5) is limited by the limiting mechanism (2) on the conveyor belt (1); The cleaning fluid is sprayed vertically toward the PCB board (5) through the low-pressure cleaning nozzle (32) in the low-pressure cleaning module (3) to clean the PCB board (5). The first limiting member (31) in the low-pressure cleaning module (3) pushes against the elastic limiting wheel (21) in the limiting mechanism (2) to tilt the PCB board (5), so that the elastic limiting wheel (21) makes line contact with the PCB board (5) and at the same time, the inner wall of the through hole (51) on the PCB board (5) forms an inclined cleaning angle with the rinsing direction of the low-pressure cleaning nozzle (32).

10. The working method of the cleaning equipment for PCB boards with holes as described in claim 9, characterized in that, In the method of tilting the PCB board (5) by pushing the elastic limiting wheel (21) in the limiting mechanism (2) with the first limiting member (31) in the low-pressure cleaning module (3), the two first limiting members (31) are staggered in the conveying direction so that when the limiting mechanism (2) drives the PCB board (5) through the low-pressure cleaning module (3), when one of the first limiting members (31) abuts against the elastic limiting wheel (21) located below and in front of the conveying direction, the other first limiting member (31) abuts against the elastic limiting wheel (21) located below and in the rear of the conveying direction, so that the PCB board (5) is tilted in the conveying direction.

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