Continuous cleaning equipment for PCB (Printed Circuit Board) etching liquid

Abstract

The invention belongs to the technical field of PCB (printed circuit board) processing, particularly relates to continuous cleaning equipment for PCB etching liquid, and aims to solve the problems that the etching liquid is wasted during existing ice particle cleaning and the distance between a nozzle and a PCB cannot be unified, the following scheme is provided: the continuous cleaning equipment comprises a cleaning box, a partition plate is fixed in the cleaning box, and the partition plate is fixed in the cleaning box; a cleaning cavity and a liquid removing cavity are formed in the cleaning box through a partition plate, a communication opening is formed in the partition plate, the cleaning cavity communicates with the liquid removing cavity through the communication opening, and a first conveying component and a second conveying component are arranged in the cleaning cavity and the liquid removing cavity correspondingly and used for conveying a PCB from the liquid removing cavity into the cleaning cavity. According to the PCB cleaning device, etching liquid attached to the surface of a PCB can be removed and collected before dry ice particle cleaning is carried out, waste of the etching liquid is avoided, the distance between a nozzle below a lifting pipe and the top of the PCB can be guaranteed all the time in the later dry ice particle cleaning process, and therefore the PCB can be effectively and comprehensively cleaned.

Description

Technical Field

[0001] The present invention relates to the technical field of PCB board processing, and particularly to a continuous cleaning device for PCB board etching solution. Background Art

[0002] PCB board etching removes excess copper conductors through chemical solutions to form the required circuit patterns. After etching, the residual etching solution on the board surface must be cleaned to prevent circuit corrosion and ensure the quality of the circuit pattern.

[0003] In the prior art, there are still the following deficiencies in the process of cleaning the etching solution on the PCB board:

[0004] 1. In the prior art, when removing the etching solution on the PCB board, a dry ice particle cleaning machine is generally used for cleaning. However, when cleaning with dry ice particles, the etching solution attached to the PCB board sublimates and vaporizes with the dry ice particles, resulting in waste of the etching solution;

[0005] 2. When cleaning with dry ice particles, the distance between the nozzle and the PCB board is in the range of 10 - 20 millimeters, and the thickness of the PCB board is not uniform. As a result, during subsequent cleaning, the distance between the nozzle and the PCB board is too large or too small, affecting the cleaning effect of the PCB board.

[0006] In view of the above problems, the present invention document proposes a continuous cleaning device for PCB board etching solution. Summary of the Invention

[0007] The purpose of the present invention is to solve the deficiencies of waste of etching solution during existing ice particle cleaning and the inability to unify the distance between the nozzle and the PCB board, and to propose a continuous cleaning device for PCB board etching solution.

[0008] To achieve the above purpose, the present invention adopts the following technical solutions:

[0009] A continuous cleaning device for PCB board etching solution includes a cleaning box. A partition is fixed inside the cleaning box. The cleaning box is divided into a cleaning chamber and a liquid removal chamber by the partition. A communication port is provided in the partition, and the cleaning chamber and the liquid removal chamber are connected through the communication port. First and second conveying members are respectively arranged in the cleaning chamber and the liquid removal chamber for conveying the PCB board from the liquid removal chamber to the cleaning chamber;

[0010] It further includes a first air outlet pipe and a second air outlet pipe located in the liquid removal chamber for blowing away the residual etching solution on the top and bottom of the PCB board, and a fixed pipe and a lifting pipe arranged in the cleaning chamber for cleaning the top and bottom of the PCB board;

[0011] A blowing structure is arranged in the liquid removal chamber for comprehensively blowing away the residual etching solution on the PCB board;

[0012] Adjusting structure, arranged in the cleaning chamber, for controlling the distance between the lifting tube and the PCB board.

[0013] In a possible design, the first conveying member is composed of a plurality of second rotating rollers, and the plurality of second rotating rollers all rotate in the cleaning chamber. The second conveying member includes a plurality of first rotating rollers, and the plurality of first rotating rollers all rotate in the liquid removal chamber. A conical conveying cylinder is fixedly sleeved on the outer wall of the first rotating roller. The diameter of the conical conveying cylinder gradually decreases from one end to the other end, for conveying the PCB board in an inclined state. A first limiting plate is fixedly sleeved on the outer wall of the end of the conical conveying cylinder with a smaller diameter. A second limiting plate is fixedly sleeved on the outer wall of the end of the second rotating roller corresponding to the first limiting plate. The second limiting plate and the first limiting plate are both used for limiting the PCB board during transportation. Material ports are arranged on both sides of the cleaning box, and the two material ports are respectively communicated with the cleaning chamber and the liquid removal chamber; the conical conveying cylinder conveys the PCB board in the liquid removal chamber, and the shape design of the conical conveying cylinder can make the PCB board have an inclined design at a certain angle, so that the etching solution on it converges towards the lower end, thus facilitating the preliminary removal and recycling of the etching solution in the later stage.

[0014] In a possible design, the blowing structure includes two connecting frames sliding on the inner wall of the top of the liquid removal cavity. The bottom ends of the two connecting frames are fixedly connected to the top of the first air outlet pipe. A nut block located between the two connecting frames is fixedly arranged on the top of the first air outlet pipe. A first threaded rod threadedly connected to the nut block is rotatably connected in the liquid removal cavity. A plurality of first jet members are arranged at the bottom of the first air outlet pipe for spraying compressed air onto the top of the PCB board. A U-shaped frame is slidably connected to the inner wall of the bottom of the liquid removal cavity. A second threaded rod is rotatably connected in the liquid removal cavity and is threadedly connected to the U-shaped frame. A plurality of first connecting plates are fixedly arranged on the top of the U-shaped frame. An elastic structure is arranged in each of the plurality of first connecting plates, and the first connecting plate is fixedly connected to the second air outlet pipe through the elastic structure for making the second air outlet pipe fit the bottom of the conical conveying cylinder. The U-shaped frame and the second threaded rod are both located below the conical conveying cylinder. A plurality of second jet members are arranged at the top of the second air outlet pipe for spraying compressed air onto the bottom of the PCB board. One ends of the second threaded rod and the first threaded rod rotatably extend to one side of the cleaning box and are connected by a synchronous pulley and a synchronous belt. A driving motor is fixedly arranged on one side of the cleaning box away from the synchronous pulley and the synchronous belt through a frame. The output shaft of the driving motor is fixedly connected to one end of the second threaded rod through a coupling; the driving motor drives the first threaded rod and the second threaded rod to rotate through the synchronous pulley and the synchronous belt, and the first air outlet pipe and the second air outlet pipe move synchronously. An external air compressor conveys air into the first air outlet pipe and the second air outlet pipe through a first three-way pipe and sprays it onto the top and the bottom of the PCB board through a first nozzle and a second nozzle, blowing the etching solution on the PCB board to the lower end of the PCB board. Since the first nozzle and the second nozzle are both arranged at a certain oblique angle, the etching solution on the PCB board can flow along the inclined surface of the PCB board, initially removing the etching solution on the PCB board, and the etching solution just drops into the liquid removal cavity for convenient reuse later.

[0015] In a possible design, the elastic structure includes a lifting groove arranged on one side of the first connecting plate. A fixed column is fixedly arranged in the lifting groove. A connecting arm fixedly connected to the second air outlet pipe is slidably sleeved on the outer wall of the fixed column. A first spring is fixedly arranged between the bottom of the connecting arm and the inner wall of the bottom of the lifting groove, and the first spring is sleeved on the outer wall of the fixed column. The cooperation of the first spring and the connecting arm makes the second air outlet pipe fit the bottom of the conical conveying cylinder; when the conical conveying cylinder conveys the PCB board, the etching solution on the PCB board will adhere to the surface of the conical conveying cylinder and gather into drops at the bottom of the conical conveying cylinder. The second threaded rod drives the U-shaped frame and the second air outlet pipe to move to one side, and the second air outlet pipe touches the bottom of the conical conveying cylinder under the elastic force of the first spring for scraping the etching solution gathered into drops at the bottom of the conical conveying cylinder to prevent too much etching solution attached to the conical conveying cylinder from reattaching to the PCB board.

[0016] In a possible design, the adjustment structure includes a plurality of second connecting plates fixed to the bottom of the lifting tube. The bottom ends of the plurality of second connecting plates are all fixed with cross plates. The bottoms of the plurality of cross plates are all rotatably connected with rubber wheels through bases. The rubber wheels cooperate with the PCB board to push the lifting tube up and down. The two ends of the lifting tube are respectively slidably connected to the inner walls of both sides of the cleaning chamber. The lifting tube and the fixed tube are respectively located above and below the second rotating roller. A plurality of nozzles are fixed to the sides of the lifting tube and the fixed tube close to each other, and are used to blow dry ice particles onto the top and bottom of the PCB board. A second three-way pipe penetrates through the cleaning box. Two of the ends of the second three-way pipe are respectively communicated with the fixed tube and the lifting tube, and the other end of the second three-way pipe is communicated with an external dry ice particle cleaning machine. Limit blocks located below the lifting tube are fixed to the inner walls of both sides of the cleaning chamber far away from each other, and are used to limit the lifting tube. When the second rotating roller conveys the PCB board to one side, the PCB board cooperates with the rubber wheel and pushes the cross plate and the lifting tube to move upward by a certain distance, controlling the distance between the nozzle at the bottom of the lifting tube and the top of the PCB board, ensuring that the dry ice particles can effectively impact and clean the surface of the PCB board, while avoiding damage to the PCB board caused by too low local temperature due to being too close, or poor cleaning effect due to being too far away. When cleaning the PCB board, the external dry ice particle cleaning machine cleans the top and bottom of the PCB board through the lifting tube, the fixed tube and the nozzle. The dry ice particles contact the etching solution residues on the PCB board under high-speed spraying. The dry ice particles quickly absorb heat and sublimate into gaseous carbon dioxide, generating a strong impact force. The combined action of this impact force and the low-temperature embrittlement effect of dry ice causes the etching solution residues to quickly disintegrate and peel off. The peeled residues are carried away together with the gas generated by the sublimation of dry ice, without leaving any residues, and comprehensively and effectively completing the cleaning operation of the PCB board.

[0017] In a possible design, an air suction fan is provided on the top of the cleaning box through an exhaust groove. A gas collecting box is fixed to the top of the cleaning box. One side of the gas collecting box is communicated with the exhaust groove through a first hose, and is used to inject the gas in the cleaning chamber into the gas collecting box. A second hose is provided on the side of the gas collecting box away from the first hose. A mounting rack is slidably connected in the gas collecting box, and the top end of the mounting rack extends above the gas collecting box. A HEPA air filter is fixed in the mounting rack and is used to filter the fine particles in the gas. When cleaning in the cleaning chamber, the dry ice is cleaned to form carbon dioxide. The carbon dioxide gas is conveyed to the gas collecting box through the air suction fan, and the HEPA air filter can filter the fine particles in the gas, preventing these fine particles from being discharged to the outside and polluting the air.

[0018] In a possible design, a plurality of the rubber wheels located at the bottom of the cross plate respectively correspond to the positions of the corresponding second rotating rollers, and the lifting pipe and the fixed pipe are located between two adjacent second rotating rollers.

[0019] In a possible design, the first jetting member and the second jetting member correspond to each other in position and are both located between two adjacent conical conveying cylinders. The first jetting member is composed of two first nozzles, the second jetting member is composed of two second nozzles, and both the first nozzles and the second nozzles are arranged obliquely at an angle of 15° - 20° for blowing the etching solution attached to the PCB board towards the lower end of the PCB board. A plurality of the first connecting plates are all located between two adjacent conical conveying cylinders.

[0020] In a possible design, a first three-way pipe penetrates through the cleaning box. Two ends of the first three-way pipe are respectively communicated with a first air outlet pipe and a second air outlet pipe, and the other end of the first three-way pipe is communicated with an external air compressor for delivering compressed air into the first air outlet pipe and the second air outlet pipe.

[0021] In a possible design, a plurality of circular grooves are provided on the bottom inner wall of the communication port. A plurality of lifting rods are slidably connected in the plurality of circular grooves. The bottom ends of the plurality of lifting rods are all fixed with second springs, and the bottom ends of the second springs are fixed on the bottom inner wall of the corresponding circular grooves. The top ends of the plurality of lifting rods are all provided with balls for supporting the PCB board. The heights of the plurality of lifting rods gradually decrease along the axial direction of the conical conveying cylinder. The conical conveying cylinder conveys the PCB board to the cleaning cavity through the communication port. During the conveying process, the lifting rods and the balls support the PCB board under the action of the second springs. When the PCB board completely detaches from the conical conveying cylinder and moves onto the second rotating roller, the PCB board tilts and falls onto the second rotating roller. The cooperation of the lifting rods and the second springs can avoid a large - force impact between the PCB board and the second rotating roller under the buffering action of the PCB board, ensuring the safety of the PCB board.

[0022] Beneficial effects: In the present invention, the bottoms of the two connecting frames are fixedly connected to the top of the first air outlet pipe. A plurality of first jet members are provided at the bottom of the first air outlet pipe. A U-shaped frame is slidably connected to the bottom inner wall of the liquid removal chamber. A plurality of first connecting plates are fixed to the top of the U-shaped frame. The plurality of first connecting plates are fixedly connected to the second air outlet pipe through an elastic structure. A plurality of second jet members are provided at the top of the second air outlet pipe. The diameter of the conical conveying cylinder gradually decreases from one end to the other end from left to right. The first air outlet pipe and the second air outlet pipe move synchronously, and the top and bottom of the PCB board are sprayed through the first nozzle and the second nozzle. And under the shape design of the conical conveying cylinder, the etching solution on the PCB board can flow along the inclined surface of the PCB board and be preliminarily removed, and the etching solution falls into the liquid removal chamber for later reuse;

[0023] In the present invention, a lifting groove is provided on one side of the first connecting plate. A fixed column is fixed in the lifting groove. A connecting arm fixedly connected to the second air outlet pipe is slidably sleeved on the outer wall of the fixed column. The bottom of the connecting arm and the bottom inner wall of the lifting groove are fixed with the same first spring. When the conical conveying cylinder conveys the PCB board, the etching solution on the PCB board will adhere to the surface of the conical conveying cylinder and gather into drops at the bottom of the conical conveying cylinder. The second threaded rod drives the U-shaped frame and the second air outlet pipe to move to one side. The second air outlet pipe touches the bottom of the conical conveying cylinder under the elastic force of the first spring, so as to scrape off the etching solution gathered into drops at the bottom of the conical conveying cylinder and prevent too much etching solution attached to the conical conveying cylinder from reattaching to the PCB board;

[0024] In the present invention, a cross plate is fixed to the bottom of the lifting pipe through a second connecting plate. A rubber wheel is rotatably connected to the bottom of the cross plate. The two ends of the lifting pipe are respectively slidably connected to the inner walls of both sides of the cleaning chamber. The lifting pipe and the fixed pipe are respectively located above and below the second rotating roller. A plurality of nozzles are fixed to one side of the lifting pipe and the fixed pipe close to each other. When the second rotating roller conveys the PCB board to one side, the PCB board cooperates with the rubber wheel and pushes the cross plate and the lifting pipe to move upward by a certain distance, controlling the distance between the nozzle at the bottom of the lifting pipe and the top of the PCB board to ensure that the dry ice particles can effectively impact and clean the surface of the PCB board.

[0025] In the present invention, the etching solution attached to the surface of the PCB board can be removed and collected before the dry ice particle cleaning, avoiding the waste of the etching solution, and during the later dry ice particle cleaning process, the distance between the nozzle below the lifting pipe and the top of the PCB board can be ensured at all times, so that the PCB board can be effectively and comprehensively cleaned. Description of the drawings

[0026] Figure 1 It is a three-dimensional structural schematic diagram of a continuous cleaning device for PCB board etching solution provided in Embodiment 1 of the present invention;

[0027] Figure 2 It is a three - dimensional sectional structure schematic diagram of a continuous cleaning device for PCB board etching solution provided in Embodiment 1 of the present invention;

[0028] Figure 3 It is a sectional structure schematic diagram of a continuous cleaning device for PCB board etching solution provided in Embodiment 1 of the present invention;

[0029] Figure 4 It is a three - dimensional sectional structure schematic diagram of a partition board, a second rotating roller and a conical conveying cylinder of a continuous cleaning device for PCB board etching solution provided in Embodiment 1 of the present invention;

[0030] Figure 5 It is a three - dimensional structure schematic diagram of a first air outlet pipe, a second air outlet pipe and a first spray head of a continuous cleaning device for PCB board etching solution provided in Embodiment 1 of the present invention;

[0031] Figure 6 It is a three - dimensional structure schematic diagram of the second air outlet pipe and the conical conveying cylinder of a continuous cleaning device for PCB board etching solution provided in Embodiment 1 of the present invention;

[0032] Figure 7 It is a three - dimensional exploded structure schematic diagram of a first connecting plate and a fixing column of a continuous cleaning device for PCB board etching solution provided in Embodiment 1 of the present invention;

[0033] Figure 8 It is a three - dimensional structure schematic diagram of a lifting pipe, a fixing pipe and a rubber wheel of a continuous cleaning device for PCB board etching solution provided in Embodiment 1 of the present invention;

[0034] Figure 9 It is a three - dimensional sectional structure schematic diagram of an air collecting box of a continuous cleaning device for PCB board etching solution provided in Embodiment 1 of the present invention;

[0035] Figure 10 It is a three - dimensional structure schematic diagram of a partition board, a lifting rod, a second rotating roller and a conical conveying cylinder of a continuous cleaning device for PCB board etching solution provided in Embodiment 2 of the present invention;

[0036] Figure 11 It is a three - dimensional exploded structure schematic diagram of a lifting rod and a partition board of a continuous cleaning device for PCB board etching solution provided in Embodiment 2 of the present invention.

[0037] In the figure: 1, cleaning box; 2, partition board; 3, communication port; 4, cleaning chamber; 5, liquid removal chamber; 6, material port; 7, first rotating roller; 8, conical conveying cylinder; 9, first limiting plate; 10, connecting frame; 11, first air outlet pipe; 12, nut block; 13, first threaded rod; 14, first spray head; 15, first three-way pipe; 16, U-shaped frame; 17, second threaded rod; 18, first connecting plate; 19, second air outlet pipe; 20, second spray head; 21, lifting groove; 22, fixed column; 23, connecting arm; 24, first spring; 25, fixed pipe; 26, nozzle; 27, lifting pipe; 28, limiting block; 29, second connecting plate; 30, cross plate; 31, rubber wheel; 32, second three-way pipe; 33, suction fan; 34, air collecting box; 35, first hose; 36, mounting frame; 37, HEPA air filter; 38, second hose; 39, round groove; 40, lifting rod; 41, second spring; 42, ball; 43, second rotating roller; 44, second limiting plate; 45, driving motor. Detailed implementation manner

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0039] Embodiment 1: Refer to Figures 1 - 3 , a cleaning device, which relates to the technical field of PCB board processing. The device includes a cleaning box 1, and a partition board 2 is fixedly installed inside the cleaning box 1. This partition board 2 divides the internal space of the cleaning box 1 into two independent parts, namely a cleaning chamber 4 and a liquid removal chamber 5. At the same time, a communication port 3 is provided inside the partition board 2, so that the cleaning chamber 4 and the liquid removal chamber 5 can communicate with each other through this communication port 3.

[0040] Refer to Figures 2 - 4 , in the cleaning chamber 4 and the liquid removal chamber 5, a first conveying member and a second conveying member are respectively provided for conveying the PCB board in these two chambers. Specifically, the first conveying member is composed of a plurality of second rotating rollers 43, and these second rotating rollers 43 are all rotatably installed in the cleaning chamber 4. The second conveying member includes a plurality of first rotating rollers 7, and these first rotating rollers 7 are all rotatably installed in the liquid removal chamber 5. In particular, a conical conveying cylinder 8 is fixedly sleeved on the outer wall of each first rotating roller 7, and the diameter of this conical conveying cylinder 8 gradually decreases from one end to the other end. Such a design can make the PCB board inclined during the conveying process, which is helpful for the convergence and removal of the etching solution.

[0041] Refer to Figure 4, a first limiting plate 9 is fixedly sleeved on the outer wall of the smaller-diameter end of the conical conveying cylinder 8. Inside the cleaning chamber 4, a second limiting plate 44 is fixedly sleeved on the outer wall of one end of the second rotating roller 43 corresponding to the first limiting plate 9. The combined action of these two limiting plates can limit the PCB board during transportation and prevent it from shifting during the conveying process.

[0042] Refer to Figure 3 , in addition, material inlets 6 are provided on both sides of the cleaning box 1, and these two material inlets 6 are respectively communicated with the cleaning chamber 4 and the liquid removal chamber 5, facilitating the entry and exit of the PCB boards.

[0043] Refer to Figure 2 , Figure 3 and Figure 5 , inside the liquid removal chamber 5, a blowing structure is also provided for comprehensively blowing the residual etching solution on the PCB board. This blowing structure includes two connecting frames 10, which are slidably installed on the top inner wall of the liquid removal chamber 5 and are fixedly connected to the top of the first air outlet pipe 11 at the bottom. A nut block 12 is also fixedly installed on the top of the first air outlet pipe 11, and this nut block 12 is in threaded cooperation with the first threaded rod 13 rotatably connected inside the liquid removal chamber 5. A plurality of first jet members are provided at the bottom of the first air outlet pipe 11 for spraying compressed air onto the top of the PCB board. At the same time, a U-shaped frame 16 is slidably connected to the bottom inner wall of the liquid removal chamber 5, and a plurality of first connecting plates 18 are fixedly installed on the top of this U-shaped frame 16. An elastic structure is provided inside each first connecting plate 18, and the second air outlet pipe 19 is fixedly connected through this elastic structure. Such a design can make the second air outlet pipe 19 closely fit the bottom of the conical conveying cylinder 8. A plurality of second jet members are provided at the top of the second air outlet pipe 19 for spraying compressed air onto the bottom of the PCB board. Specifically, one ends of the first threaded rod 13 and the second threaded rod 17 both rotatably extend to one side of the cleaning box 1 and are connected by a synchronous pulley and a synchronous belt. A driving motor 45 is fixedly installed on one side of the cleaning box 1 away from the synchronous pulley and the synchronous belt through a frame, and the output shaft of this driving motor 45 is fixedly connected to one end of the second threaded rod 17 through a coupling.

[0044] Specifically, when the driving motor 45 is started, it can drive the first threaded rod 13 and the second threaded rod 17 to rotate synchronously through the synchronous pulley and the synchronous belt, thereby driving the first air outlet pipe 11 and the second air outlet pipe 19 to move synchronously. At this time, an external air compressor conveys air into the first air outlet pipe 11 and the second air outlet pipe 19 through the first three-way pipe 15, and sprays the top and bottom of the PCB board through the first nozzles 14 and the second nozzles 20. This can blow the etching solution on the PCB board towards the lower end of the PCB board and flow along the inclined surface of the PCB board, realizing the preliminary removal of the etching solution. These removed etching solutions will fall into the liquid removal chamber 5 for convenient reuse later.

[0045] Reference Figure 6 and Figure 7 Figure 7 , the elastic structure includes a lifting groove 21 provided on one side of the first connecting plate 18, and a fixing column 22 is firmly fixed in the lifting groove 21. On the outer wall of the fixing column 22, a connecting arm 23 is slidably sleeved, and the connecting arm 23 is firmly fixed to the second air outlet pipe 19. Between the bottom of the connecting arm 23 and the inner wall of the bottom of the lifting groove 21, a first spring 24 is fixed, and the first spring 24 is also sleeved on the outer wall of the fixing column 22.

[0046]

[0046] This structure enables the second air outlet pipe 19 to closely fit the bottom of the conical conveying cylinder 8 under the elastic force of the first spring 24. When the conical conveying cylinder 8 conveys the PCB board, the etching solution on the PCB board will adhere to the surface of the conical conveying cylinder 8 and gather into drops at its bottom. At this time, the U-shaped frame 16 and the second air outlet pipe 19 are driven by the second threaded rod 17 to move to one side. Due to the elastic force of the first spring 24, the second air outlet pipe 19 will closely touch the bottom of the conical conveying cylinder 8, thereby scraping off the gathered etching solution drops, effectively preventing too much etching solution attached to the conical conveying cylinder 8 from reattaching to the PCB board.

[0047] Reference Figure 2 、 Figure 3 and Figure 8 Figure 8 , in the cleaning chamber 4, a fixed pipe 25 and a lifting pipe 27 are also provided for cleaning the top and bottom of the PCB board. At the same time, an adjusting structure is also provided to control the distance between the lifting pipe 27 and the PCB board to ensure the cleaning effect. The adjusting structure includes a plurality of second connecting plates 29 fixed to the bottom of the lifting pipe 27, and a cross plate 30 is firmly fixed to the bottom end of each second connecting plate 29. At the bottom of the cross plate 30, rubber wheels 31 are rotatably connected through a base, and these rubber wheels 31 cooperate with the PCB board to push the lifting pipe 27 to lift and lower. Both ends of the lifting pipe 27 are slidably connected to the inner walls of both sides of the cleaning chamber 4, ensuring that the lifting pipe 27 can move up and down smoothly. The lifting pipe 27 and the fixed pipe 25 are respectively located above and below the second rotating roller 43, and a plurality of nozzles 26 are fixed to the side where they are close to each other for blowing dry ice particles to the top and bottom of the PCB board. A second three-way pipe 32 penetrates through the cleaning box 1, and two of the ends of the second three-way pipe 32 are respectively connected to the fixed pipe 25 and the lifting pipe 27, and the other end is connected to an external dry ice particle cleaning machine. On the inner walls of both sides of the cleaning chamber 4, limit blocks 28 are fixed, and these limit blocks 28 are located below the lifting pipe 27 for limiting the lifting pipe 27.

[0048] Specifically, when the second rotating roller 43 conveys the PCB board to one side, the PCB board will cooperate with the rubber wheel 31 to push the cross plate 30 and the lifting pipe 27 upward by a certain distance, thereby controlling the distance between the nozzle 26 at the bottom of the lifting pipe 27 and the top of the PCB board. This can not only ensure that the dry ice particles can effectively impact and clean the surface of the PCB board, but also avoid damage to the PCB board caused by too low local temperature due to being too close, or poor cleaning effect due to being too far. When cleaning the PCB board, the external dry ice particle cleaning machine will clean the top and bottom of the PCB board through the lifting pipe 27, the fixed pipe 25 and the nozzle 26. The dry ice particles contact the etching solution residues on the PCB board under high-speed spraying, quickly absorb heat and sublimate into gaseous carbon dioxide, generating a strong impact force. The combined action of this impact force and the low-temperature embrittlement effect of dry ice causes the etching solution residues to quickly disintegrate and peel off, and the peeled residues are carried away together with the gas generated by the sublimation of dry ice, comprehensively and effectively completing the cleaning operation of the PCB board.

[0049] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 9 , on the top of the cleaning box 1, an air suction fan 33 is provided through the exhaust groove for extracting the gas in the cleaning chamber 4. At the same time, a gas collecting box 34 is firmly fixed on the top of the cleaning box 1. One side of the gas collecting box 34 is connected to the exhaust groove through a first hose 35 for injecting the gas in the cleaning chamber 4 into the gas collecting box 34. A second hose 38 is provided on the side of the gas collecting box 34 away from the first hose 35 for discharging the filtered gas. Inside the gas collecting box 34, a mounting frame 36 is slidably connected, and the top end of the mounting frame 36 extends above the gas collecting box 34 for easy removal and replacement. Inside the mounting frame 36, a HEPA air filter 37 is fixed for filtering the tiny particles in the gas.

[0050] Specifically, when cleaning in the cleaning chamber 4, the carbon dioxide gas formed after dry ice cleaning is conveyed to the gas collecting box 34 through the air suction fan 33, and the HEPA air filter 37 can effectively filter the tiny particles in the gas to prevent these tiny particles from being discharged to the outside and causing air pollution.

[0051] Referring to Figure 3 and Figure 8 , at the bottom of the cross plate 30 located inside the cleaning box 1, we installed a plurality of rubber wheels 31. The positions of these rubber wheels 31 are specially designed to correspond to the positions of the corresponding second rotating rollers 43 to ensure the stability and continuity of the PCB board during transportation. In addition, the lifting pipe 27 and the fixed pipe 25 are cleverly placed at the position between two adjacent second rotating rollers 43 to adapt to the transportation and cleaning requirements of the PCB board.

[0052] Reference Figure 3 and Figure 5 The first jet component and the second jet component are designed to be in corresponding positions and are both located between two adjacent conical conveying cylinders 8. The first jet component consists of two first nozzles 14, while the second jet component consists of two second nozzles 20. These nozzles are designed to be arranged obliquely at an angle of 15° - 20°, which can effectively blow the etching solution attached to the PCB board towards the lower end of the PCB board, thus achieving continuous removal of the etching solution. At the same time, a plurality of first connecting plates 18 are also placed between two adjacent conical conveying cylinders 8 to further support the stable operation of the jet component.

[0053] Reference Figure 5 We passed a first three-way pipe 15 through the cleaning box 1. Two ends of the first three-way pipe 15 are respectively communicated with the first air outlet pipe 11 and the second air outlet pipe 19, and the other end is communicated with an external air compressor. In this way, the air compressor can transport compressed air into the first air outlet pipe 11 and the second air outlet pipe 19 through the first three-way pipe 15, thus providing the required power for the jet component.

[0054] Through the above design, this equipment can achieve continuous cleaning of the etching solution on the PCB board, not only improving the cleaning efficiency, but also contributing to the recycling of the etching solution and reducing the production cost.

[0055] Embodiment 2: Refer to Figure 10 and Figure 11 A plurality of circular grooves 39 are provided on the bottom inner wall of the communication port 3. Lift rods 40 are slidably connected in these circular grooves 39. A second spring 41 is fixed to the bottom end of the lift rod 40, and the bottom end of the second spring 41 is fixed to the bottom inner wall of the corresponding circular groove 39. A ball 42 is provided at the top end of the lift rod 40, and these balls 42 are used to support the PCB board. In particular, we designed the heights of a plurality of lift rods 40 to gradually decrease along the axial direction of the conical conveying cylinder 8.

[0056] When the conical conveying cylinder 8 conveys the PCB board into the cleaning chamber 4 through the communication port 3, the lift rods 40 and the balls 42 play a good supporting role for the PCB board under the action of the second spring 41. When the PCB board completely detaches from the conical conveying cylinder 8 and moves onto the second rotating roller 43, since the PCB board is in an inclined state at this time, it will naturally fall onto the second rotating roller 43. In this process, the cooperation between the lift rod 40 and the second spring 41 plays a buffering role, avoiding a large impact force between the PCB board and the second rotating roller 43, thus ensuring the safety of the PCB board.

[0057] A method for using a continuous cleaning device for PCB board etching solution includes the following steps:

[0058] S1. Place the etched PCB board into the liquid removal chamber 5 through the material inlet 6. The PCB board is located above multiple conical conveying cylinders 8. The conical conveying cylinders 8 convey the PCB board. Since the diameter of the conical conveying cylinders 8 gradually decreases from left to right, the PCB board is placed obliquely, causing the etching solution on the PCB board to gradually flow to one side.

[0059] S2. When the conical conveying cylinders 8 rotate to convey the PCB board, the driving motor 45 drives the first threaded rod 13 and the second threaded rod 17 to rotate through the synchronous pulley and synchronous belt. The first air outlet pipe 11 and the second air outlet pipe 19 move synchronously. The external air compressor conveys air into the first air outlet pipe 11 and the second air outlet pipe 19 through the first three-way pipe 15, and sprays the top and bottom of the PCB board through the first spray head 14 and the second spray head 20, blowing the etching solution on the PCB board towards the lower end of the PCB board. Since the first spray head 14 and the second spray head 20 are both arranged at a certain oblique angle, the etching solution on the PCB board can flow along the inclined surface of the PCB board, initially removing the etching solution on the PCB board, and the etching solution just falls into the liquid removal chamber 5 for later reuse.

[0060] S3. When the conical conveying cylinders 8 convey the PCB board, the etching solution on the PCB board will adhere to the surface of the conical conveying cylinders 8 and gather into drops at the bottom of the conical conveying cylinders 8. The second threaded rod 17 drives the U-shaped frame 16 and the second air outlet pipe 19 to move to one side. The second air outlet pipe 19 touches the bottom of the conical conveying cylinders 8 under the elastic force of the first spring 24, so as to scrape off the etching solution gathered into drops at the bottom of the conical conveying cylinders 8, preventing too much etching solution attached to the conical conveying cylinders 8 from reattaching to the PCB board.

[0061] S4. The conical conveying cylinders 8 convey the PCB board into the cleaning chamber 4 through the communication port 3. During the conveying process, the lifting rod 40 and the ball 42 support the PCB board under the action of the second spring 41. When the PCB board completely detaches from the conical conveying cylinders 8 and moves onto the second rotating roller 43, the PCB board tilts and falls onto the second rotating roller 43. The cooperation of the lifting rod 40 and the second spring 41 can buffer the PCB board and prevent a large impact force between the PCB board and the second rotating roller 43, ensuring the safety of the PCB board.

[0062] When the second rotating roller 43 conveys the PCB board to one side, the PCB board cooperates with the rubber wheel 31 and pushes the cross plate 30 and the lifting pipe 27 to move upward by a certain distance, controlling the distance between the nozzle 26 at the bottom of the lifting pipe 27 and the top of the PCB board, ensuring that the dry ice particles can effectively impact and clean the surface of the PCB board, while avoiding damage to the PCB board caused by too low local temperature due to being too close, or poor cleaning effect due to being too far away; when cleaning the PCB board, the external dry ice particle cleaning machine cleans the top and bottom of the PCB board through the lifting pipe 27, the fixed pipe 25 and the nozzle 26, and the dry ice particles contact the etching solution residues on the PCB board under high-speed spraying; the dry ice particles quickly absorb heat and sublimate into gaseous carbon dioxide, generating a strong impact force; the combined action of this impact force and the low-temperature embrittlement effect of dry ice causes the etching solution residues to quickly disintegrate and peel off; the peeled residues are taken away together with the gas generated by the sublimation of dry ice, leaving no residues; comprehensively and effectively completing the cleaning operation of the PCB board;

[0063] S6. During cleaning, the generated gas is conveyed into the air collecting box 34 by the suction fan 33, and the HEPA air filter 37 can filter the tiny particles in the gas. When cleaning in the cleaning chamber 4, after dry ice cleaning, carbon dioxide is formed. The carbon dioxide gas is conveyed into the air collecting box 34 by the suction fan 33, and the HEPA air filter 37 can filter the tiny particles in the gas, preventing these tiny particles from being discharged to the outside and polluting the air.

[0064] However, as is well known to those skilled in the art, the working principles and wiring methods of the drive motor 45 and the suction fan 33 are common knowledge, and they both belong to conventional means or well-known common sense, so they will not be elaborated here. Those skilled in the art can make any selection according to their needs or convenience.

[0065] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A PCB etching liquid continuous cleaning device, characterized in that: The cleaning box (1) comprises a cleaning box (1), a partition (2) is fixed in the cleaning box (1), a cleaning chamber (4) and a liquid removal chamber (5) are formed in the cleaning box (1) through the partition (2), a connecting port (3) is provided in the partition (2), and the cleaning chamber (4) and the liquid removal chamber (5) are connected through the connecting port (3), and a first conveying member and a second conveying member are respectively provided in the cleaning chamber (4) and the liquid removal chamber (5); It also includes a first air outlet pipe (11) and a second air outlet pipe (19) located in the liquid removal chamber (5), and a fixed pipe (25) and a lifting pipe (27) are provided in the cleaning chamber (4); A blowing structure is arranged in the liquid removal chamber (5) and is used to completely blow away the etching liquid remaining on the PCB board; The regulating structure is arranged in the cleaning chamber (4) and is used to control the distance between the lifting tube (27) and the PCB board.

2. A PCB board etching liquid continuous cleaning device according to claim 1, characterized in that, The first conveying member is composed of a plurality of second rotating rollers (43), and the plurality of second rotating rollers (43) all rotate in the cleaning chamber (4); the second conveying member includes a plurality of first rotating rollers (7), and the plurality of first rotating rollers (7) all rotate in the liquid removal chamber (5); a conical conveying cylinder (8) is fixedly sleeved on the outer wall of the first rotating roller (7); the diameter of the conical conveying cylinder (8) gradually decreases from one end to the other end, and is used to transport the PCB board in an inclined state; a first limiting plate (9) is fixedly sleeved on the outer wall of the end with a smaller diameter of the conical conveying cylinder (8); a second limiting plate (44) is fixedly sleeved on the outer wall of the end of the second rotating roller (43) corresponding to the first limiting plate (9); the second limiting plate (44) and the first limiting plate (9) are both used to limit the PCB board in transportation; material ports (6) are provided on both sides of the cleaning box (1), and the two material ports (6) are respectively connected to the cleaning chamber (4) and the liquid removal chamber (5).

3. A PCB board etching liquid continuous cleaning device according to claim 2, characterized in that, The blowing structure comprises two connecting frames (10) sliding on the top inner wall of the deliquidation chamber (5), the bottom ends of the two connecting frames (10) are fixedly connected to the top of the first air outlet pipe (11), a nut block (12) located between the two connecting frames (10) is fixed on the top of the first air outlet pipe (11), a first threaded rod (13) threadedly connected to the nut block (12) is rotatably connected in the deliquidation chamber (5), a plurality of first jet components are provided at the bottom of the first air outlet pipe (11) for spraying compressed air toward the top of the PCB board, a U-shaped frame (16) is slidably connected to the bottom inner wall of the deliquidation chamber (5), a second threaded rod (17) is rotatably connected in the deliquidation chamber (5), and the second threaded rod (17) is threadedly connected to the U-shaped frame (16), and a plurality of first connecting plates (18) are fixed on the top of the U-shaped frame (16). , a plurality of the first connecting plates (18) are each provided with an elastic structure, and the first connecting plates (18) are fixedly connected to the second air outlet pipe (19) through the elastic structure, so as to make the second air outlet pipe (19) fit the bottom of the conical conveying cylinder (8), the U-shaped frame (16) and the second threaded rod (17) are both located below the conical conveying cylinder (8), a plurality of second jet components are provided on the top of the second air outlet pipe (19), so as to spray compressed air toward the bottom of the PCB board, one end of the second threaded rod (17) and the first threaded rod (13) are both rotated and extended to one side of the cleaning box (1) and are connected through a synchronous wheel and a synchronous belt, a driving motor (45) is fixed to the side of the cleaning box (1) away from the synchronous wheel and the synchronous belt through a frame, and an output shaft of the driving motor (45) is fixedly connected to one end of the second threaded rod (17) through a coupling.

4. A PCB board etching liquid continuous cleaning device according to claim 3, characterized in that, The elastic structure comprises a lifting groove (21) arranged on one side of the first connecting plate (18), a fixing column (22) being fixed in the lifting groove (21), a connecting arm (23) fixedly connected to the second air outlet pipe (19) being slidably sleeved on the outer wall of the fixing column (22), a first spring (24) being fixed at the bottom of the connecting arm (23) and the inner wall of the bottom of the lifting groove (21), and the first spring (24) being sleeved on the outer wall of the fixing column (22), and the cooperation between the first spring (24) and the connecting arm (23) enables the second air outlet pipe (19) to fit the bottom of the conical conveying cylinder (8).

5. A PCB board etching liquid continuous cleaning device according to claim 4, characterized in that, The adjustment structure comprises a plurality of second connecting plates (29) fixed to the bottom of the lifting tube (27), the bottom ends of the plurality of second connecting plates (29) are all fixed with a transverse plate (30), the bottoms of the plurality of transverse plates (30) are all rotatably connected with a rubber wheel (31) through a base, the rubber wheel (31) cooperates with the PCB board to push the lifting tube (27) up and down, the two ends of the lifting tube (27) are respectively slidably connected to the inner walls of the cleaning chamber (4), the lifting tube (27) and the fixed tube (25) are respectively located above and below the second rotating roller (43), and the lifting tube (27) is arranged on the upper side and the lower side of the second rotating roller (43). 7) A plurality of nozzles (26) are fixed on the side close to the fixed tube (25) for blowing dry ice particles toward the top and bottom of the PCB board; a second three-way tube (32) runs through the cleaning box (1); two ends of the second three-way tube (32) are respectively connected to the fixed tube (25) and the lifting tube (27); the other end of the second three-way tube (32) is connected to an external dry ice particle cleaning machine; and two inner walls of the cleaning chamber (4) that are away from each other are fixed with limit blocks (28) located below the lifting tube (27) for limiting the position of the lifting tube (27).

6. A PCB board etching liquid continuous cleaning device according to claim 5, characterized in that: An air intake fan (33) is provided at the top of the cleaning box (1) through an exhaust groove, and an air collecting box (34) is fixed at the top of the cleaning box (1). One side of the air collecting box (34) is connected to the exhaust groove through a first hose (35) for injecting the gas in the cleaning chamber (4) into the air collecting box (34). A second hose (38) is provided on the side of the air collecting box (34) away from the first hose (35). A mounting frame (36) is slidably connected inside the air collecting box (34), and the top end of the mounting frame (36) extends to the top of the air collecting box (34). A HEPA air filter (37) is fixed inside the mounting frame (36) for filtering tiny particles in the gas.

7. A PCB board etching liquid continuous cleaning device according to claim 6, characterized in that: The plurality of rubber wheels (31) located at the bottom of the transverse plate (30) correspond to the positions of the corresponding second rotating rollers (43), and the lifting tube (27) and the fixing tube (25) are located between two adjacent second rotating rollers (43).

8. A PCB board etching liquid continuous cleaning device according to claim 7, characterized in that: The first jet component and the second jet component are positioned correspondingly and are both located between two adjacent conical conveying cylinders (8); the first jet component is composed of two first nozzles (14); the second jet component is composed of two second nozzles (20); the first nozzles (14) and the second nozzles (20) are both arranged at an angle of 15°-20° and are used to blow the etching liquid attached to the PCB board toward the lower end of the PCB board; and the plurality of first connecting plates (18) are all located between two adjacent conical conveying cylinders (8).

9. A PCB board etching liquid continuous cleaning device according to claim 8, characterized in that: A first three-way pipe (15) runs through the cleaning box (1), two ends of the first three-way pipe (15) are respectively connected to the first air outlet pipe (11) and the second air outlet pipe (19), and the other end of the first three-way pipe (15) is connected to an external air compressor for conveying compressed air to the first air outlet pipe (11) and the second air outlet pipe (19).

10. A PCB etching liquid continuous cleaning device according to claim 9, characterized in that: The bottom inner wall of the connecting port (3) is provided with a plurality of circular grooves (39), and lifting rods (40) are slidably connected in the plurality of circular grooves (39). The bottom ends of the plurality of lifting rods (40) are fixed with second springs (41), and the bottom ends of the second springs (41) are fixed to the bottom inner walls of the corresponding circular grooves (39). The top ends of the plurality of lifting rods (40) are provided with balls (42) for supporting the PCB board, and the heights of the plurality of lifting rods (40) gradually decrease along the axial direction of the conical conveying cylinder (8).

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