A cleaning device for tin-plated circuit board production

Abstract

This invention discloses a cleaning device for tin-plated circuit board production, relating to the field of circuit board cleaning. The proposed solution includes: a cleaning box, with both ends open and higher than the middle, for loading and unloading circuit boards; a belt conveyor mechanism installed at both ends of the cleaning box for conveying the circuit boards; a positioning conveyor mechanism, sealed and installed on the cleaning box for positioning and conveying the circuit boards; a cleaning mechanism distributed on the upper and lower sides of the circuit boards for rinsing the circuit boards from multiple angles; a water tank fixed to the surface of the cleaning box for providing a water source; and a pressurization system fixed to the surface of the cleaning box. By positioning and conveying the circuit boards through the positioning conveyor mechanism, the conveying effect of the positioning conveyor mechanism is ensured, and the edges of the circuit boards are not constantly obstructed, thus not affecting the edge cleaning of the positioning conveyor mechanism. Furthermore, the cleaning mechanism sprays detergent from multiple angles to ensure thorough cleaning of the outer surface of the circuit boards.

Description

Technical Field

[0001] This invention relates to the field of circuit board cleaning, and more particularly to a cleaning device for the production of tin-plated circuit boards. Background Technology

[0002] Before tin plating, residual oil stains, dust, and other contaminants on the surface of the circuit board, such as at the solder joints, can affect the tin plating process. Therefore, the circuit board is cleaned before tin plating.

[0003] For example, CN116056357A discloses a cleaning device for tin-plated circuit board production, including a main body of the cleaning equipment, a circuit board conveyor belt installed on the main body of the cleaning equipment, and several fixing structures symmetrically installed in pairs on the outer surface of the circuit board conveyor belt. The fixing structure includes a fixing rod, a clamping spring structure, an anti-detachment baffle, a telescopic connecting column, and a fixing clamp. The clamping spring structure and the anti-detachment baffle are both installed inside the fixing rod. The fixing clamp is located inside the fixing rod. The telescopic connecting column passes through the inner wall of the fixing rod and connects the fixing clamp and the anti-detachment baffle together. By setting the fixing structure on the circuit board conveyor belt, when cleaning the circuit board body, the circuit board body can be placed on the circuit board conveyor belt and fixed for cleaning using the fixing structure, so that the circuit board body will not move when being cleaned, and thus the circuit board body can be effectively cleaned.

[0004] This patented method of cleaning by fixing the circuit board has several problems. First, both sides and the outer perimeter of the circuit board need to be cleaned, but this patent can only clean one side at a time. Furthermore, fixing the outer perimeter of the circuit board by the fixed structure will prevent the outer perimeter from being cleaned, affecting the cleaning efficiency and effect. Second, since the oil stains that are difficult to clean on the surface of the circuit board are currently the detergents used for cleaning, they are acidic. Even if a weak acid detergent is used, if too much is used, it will corrode the circuit board. If too little is used, it will affect the cleaning effect. It is impossible to adjust the amount of detergent accordingly. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a cleaning device for the production of tin-plated circuit boards, so as to achieve multi-angle cleaning and improve cleaning efficiency and effect by adjusting the amount of detergent.

[0006] To achieve the above-mentioned technical objectives, the present invention provides a cleaning device for the production of tin-plated circuit boards:

[0007] It includes: a cleaning box, open at both ends and higher than the middle, for the entry and exit of circuit boards; a belt conveyor mechanism, installed at both ends of the cleaning box, for conveying circuit boards; a positioning conveyor mechanism, sealed and installed on the cleaning box, for positioning and conveying circuit boards; a cleaning mechanism, distributed on the upper and lower sides of the circuit boards, for rinsing the circuit boards from multiple angles; a water tank, fixed to the surface of the cleaning box, for providing a water source; and a pressurization system, fixed to the surface of the cleaning box, for drawing water from the water tank, pressurizing it, and supplying it to the cleaning mechanism.

[0008] Preferably, it further includes: a first acquisition module for acquiring circuit board surface data; a second acquisition module for acquiring wastewater data; and a cleaning recognition module for inputting the surface data and wastewater data into a trained cleaning recognition model and outputting washing data, which serves as the adjustment parameter of the booster system.

[0009] Preferably, baffles are fixed at both ends of the cleaning box, and a drain pipe is fixed at the bottom of the cleaning box.

[0010] Preferably, the belt conveyor mechanism includes a first conveyor belt, a second conveyor belt, and support rollers. Multiple support rollers are provided, and both ends of the multiple support rollers are rotatably connected to the cleaning box. Both ends of the first conveyor belt and the second conveyor belt are sleeved on the support rollers.

[0011] Preferably, the positioning and conveying mechanism includes: a guide plate with conveying guide wheels evenly distributed throughout its surface, and the conveying guide wheels being rotatably and sealed to the guide plate; a synchronous pulley fixed to the end of the conveying guide wheel; a synchronous toothed belt sleeved on the synchronous pulley for linkage between multiple conveying guide wheels; and a sealing plate fixedly and sealed to the bottom of the guide plate, and the sealing plate being fixedly and sealed to the cleaning box.

[0012] Preferably, the cleaning mechanism includes: a main pipe, which is rotatably and sealingly connected to the cleaning box; a branch pipe, which is rotatably and sealingly connected to the end of the main pipe; and a nozzle, which is rotatably and sealingly connected to the branch pipe.

[0013] Preferably, the outer periphery of the end of the main pipe is fixed with an extension edge, the end of the branch pipe is fixed with a connector, and the connector is rotatably sealed to the extension edge, and a water wheel is fixed inside the branch pipe.

[0014] Preferably, the pressurization system includes: a booster pump fixed to the cleaning tank; an inlet pipe, the water tank being connected to the input end of the booster pump via the inlet pipe; an outlet pipe, the main pipe being connected to the output end of the booster pump via the outlet pipe, the end of the main pipe being rotatably sealed with a rotary joint, and the end of the outlet pipe being fixedly connected to the end of the rotary joint; and a solenoid valve fixed to the outlet pipe for controlling the flow rate within the outlet pipe.

[0015] Preferably, a steam generating mechanism is fixed to the outer surface of the cleaning box. The steam generating mechanism includes: a fixing box fixed to the cleaning box; a heating element fixed inside the cleaning box, the inner cavity of the heating element being connected to the output end of a booster pump through a water outlet pipe; an air pump fixed inside the fixing box, the input end of which is connected to the inner cavity of the heating element; and an air nozzle penetrating the surface of the cleaning box and fixed to the fixing box, the output end of the air pump being connected to the air nozzle.

[0016] As can be seen from the above technical solutions, this application has the following beneficial effects:

[0017] 1. The positioning and conveying mechanism positions and conveys the circuit board, ensuring the conveying effect of the positioning and conveying mechanism, and the edge of the circuit board is not always blocked, which does not affect the edge cleaning of the positioning and conveying mechanism. In addition, the cleaning mechanism sprays detergent from multiple angles to ensure that the outer surface of the circuit board is thoroughly cleaned.

[0018] 2: By collecting surface data of circuit boards and washing wastewater data, the contamination status of the current batch of circuit boards can be analyzed to predict the contamination status of the next batch of circuit boards, thereby adjusting the amount of detergent used. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of a cleaning device for tin-plated circuit board production provided by the present invention;

[0021] Figure 2 This is a top view of a cleaning device for tin-plated circuit board production provided by the present invention;

[0022] Figure 3 This invention provides a front sectional view of a cleaning device for tin-plated circuit board production.

[0023] Figure 4 This invention provides a side cross-sectional view of a cleaning device for tin-plated circuit board production.

[0024] Figure 5 This invention provides a partial cross-sectional view of the positioning and conveying mechanism of a cleaning device for tin-plated circuit board production.

[0025] Figure 6This invention provides a partial cross-sectional view of the cleaning mechanism of a cleaning device for tin-plated circuit board production.

[0026] Figure 7 An enlarged structural diagram of point A of a cleaning device for tin-plated circuit board production provided by the present invention;

[0027] Figure 8 A schematic diagram of the overall structure of the pressurization system of a cleaning device for tin-plated circuit board production provided by the present invention;

[0028] Figure 9 This invention provides a schematic diagram of the cleaning and identification module structure of a cleaning device for tin plating circuit board production.

[0029] Figure Descriptions: 1. Cleaning box; 11. Baffle; 12. Drain pipe; 2. Belt conveyor mechanism; 21. First conveyor belt; 22. Second conveyor belt; 23. Support roller; 3. Positioning conveyor mechanism; 31. Guide plate; 32. Conveyor guide wheel; 33. Synchronous pulley; 34. Synchronous toothed belt; 35. Sealing plate; 4. Cleaning mechanism; 41. Main pipe; 411. Extension edge; 42. Diverter pipe; 421. Connector; 422. Water wheel; 43. Nozzle; 44. Rotary joint; 5. Water tank; 6. Pressurization system; 61. Booster pump; 62. Inlet pipe; 63. Outlet pipe; 64. Solenoid valve; 7. Steam generator; 71. Fixing box; 72. Heating element; 73. Air pump; 74. Air nozzle. Detailed Implementation

[0030] The following description is exemplary in nature and is not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. The figures are merely schematic representations of the concept and principles of embodiments of this disclosure and do not necessarily show the specific dimensions and scale of the various embodiments of this disclosure. Certain details or structures of embodiments of this disclosure may be exaggerated in particular portions of certain figures.

[0031] Example 1, see Figure 1 , Figure 2 and Figure 3 As shown, a cleaning device for tin-plated circuit board production includes a cleaning box 1, a belt conveyor mechanism 2, a positioning conveyor mechanism 3, a cleaning mechanism 4, a water tank 5, and a pressurization system 6. The two ends of the cleaning box 1 are open and higher than the middle, so that water is collected in the middle. One side is used to enter the circuit board and the other side is used to exit the circuit board. Baffles 11 are fixed at both ends of the cleaning box 1 to prevent water from splashing out from both sides. A drain pipe 12 is fixed at the bottom of the cleaning box 1 for discharging wastewater.

[0032] See Figure 1 and Figure 2 As shown, the belt conveyor mechanism 2 is installed at both ends of the cleaning box 1 for conveying circuit boards. The belt conveyor mechanism 2 includes a first conveyor belt 21, a second conveyor belt 22, and support rollers 23. There are multiple support rollers 23, and both ends of the multiple support rollers 23 are rotatably connected to the cleaning box 1. Both ends of the first conveyor belt 21 and the second conveyor belt 22 are sleeved on the support rollers 23. The specific number and distribution position of the support rollers 23 are determined according to the distribution position of the first conveyor belt 21 and the second conveyor belt 22, and are not specifically limited here. By rotating the support rollers 23, the first conveyor belt 21 and the second conveyor belt 22 can be driven to roll, thereby conveying the circuit boards.

[0033] See Figure 4 and Figure 5 As shown, the positioning and conveying mechanism 3 is sealed and installed on the cleaning box 1. It is used to position and convey the circuit board, ensuring that the circuit board does not shake and also allowing the circuit board to move horizontally. The positioning and conveying mechanism 3 includes: a guide plate 31 with conveying guide wheels 32 evenly distributed through its surface, and the conveying guide wheels 32 are rotatably and sealed to the guide plate 31; a synchronous pulley 33 fixed to the end of the conveying guide wheel 32; a synchronous toothed belt 34 sleeved on the synchronous pulley 33 for linkage between multiple conveying guide wheels 32; and a sealing plate 35 fixedly and sealed to the bottom of the guide plate 31, and the sealing plate 35 is fixedly and sealed to the cleaning box 1. The purpose is to isolate the synchronous pulley 33 and the synchronous toothed belt 34 outside the cleaning box 1, avoid contamination of the synchronous pulley 33 and the synchronous toothed belt 34, and improve their service life.

[0034] For example, multiple synchronous pulleys 33 are connected by a synchronous toothed belt 34, so that as long as one of the conveyor pulleys 32 rotates, the other conveyor pulleys 32 can also rotate synchronously.

[0035] It is worth mentioning that both the conveyor guide roller 32 and the support roller 23 are driven by motors, but the motors are not shown in this embodiment.

[0036] For further details, please refer to [link / reference]. Figure 4 , Figure 6 , Figure 7 and Figure 8As shown, the cleaning mechanism 4 is distributed on the upper and lower sides of the circuit board for rinsing the circuit board from multiple angles. The cleaning mechanism 4 includes: a main pipe 41, which is rotatably and sealingly connected to the cleaning box 1; a branch pipe 42, which is rotatably and sealingly connected to the end of the main pipe 41; and a nozzle 43, which is rotatably and sealingly connected to the branch pipe 42. An extension edge 411 is fixed to the outer periphery of the end of the main pipe 41, and a connector 421 is fixed to the end of the branch pipe 42. The connector 421 is rotatably and sealingly connected to the extension edge 411. A water wheel 422 is fixed inside the branch pipe 42. The connection method between the nozzle 43 and the branch pipe 42 is the same as the connection method between the branch pipe 42 and the main pipe 41. That is, when water flows into the main pipe 41, it will impact the water wheel 422 to rotate, causing the water wheel 422 to drive the branch pipe 42 to rotate. Similarly, the nozzle 43 can also rotate, thereby achieving the effect of rinsing the circuit board from multiple angles.

[0037] See Figure 1 and Figure 8 As shown, water tank 5 is fixed to the surface of cleaning tank 1 to provide water; pressurization system 6 is fixed to the surface of cleaning tank 1 to extract water from water tank 5, pressurize it, and supply it to cleaning mechanism 4. Pressurization system 6 includes: pressurization pump 61, fixed to cleaning tank 1; water inlet pipe 62, through which water tank 5 is connected to the input end of pressurization pump 61; water outlet pipe 63, through which main pipe 41 is connected to the output end of pressurization pump 61, and the end of main pipe 41 is rotatably sealed with a rotary joint 44, and the end of water outlet pipe 63 is fixedly connected to the end of rotary joint 44; solenoid valve 64 is fixed to water outlet pipe 63 to control the flow rate in water outlet pipe 63.

[0038] Furthermore, a steam generating mechanism 7 is fixed to the outer surface of the cleaning box 1. The steam generating mechanism 7 includes: a fixing box 71, fixed to the cleaning box 1; a heating element 72, fixed inside the cleaning box 1, the inner cavity of the heating element 72 being connected to the output end of the booster pump 61 through a water outlet pipe 63; an air pump 73, fixed inside the fixing box 71, the input end being connected to the inner cavity of the heating element 72; and an air nozzle 74, penetrating the surface of the cleaning box 1 and fixed to the fixing box 71, the output end of the air pump 73 being connected to the air nozzle 74. For example, the heating element 72 heats water to generate steam, and the air pump 73 sends the steam into the air nozzle 74 to spray it onto the circuit board, which can heat the circuit board, promote the dissolution of oil stains, and further improve the cleaning effect.

[0039] It should be noted that the heating element 72 in this embodiment is a resistance wire heating or a graphite heating, and the specific heating structure is not limited here.

[0040] Example 2, see Figure 2 and Figure 9As shown, a cleaning device for tin-plated circuit board production, based on embodiment 1, further includes a first acquisition module, a second acquisition module and a cleaning identification module, wherein each module and the solenoid valve 64 are connected by wired and / or wireless means.

[0041] The first acquisition module is used to collect data on the surface of the circuit board. In this embodiment, the first acquisition module is a camera or photometer, etc., which is not specifically limited here. It is used to collect surface images or gloss of the circuit board. Specifically, it is installed on the surface of the cleaning box 1, and the detection unit faces the belt conveyor mechanism 2. In this way, the surface of the circuit board that passes through will be collected. By analyzing the images or gloss, the cleanliness of the circuit board surface can be analyzed. In this embodiment, the acquisition environment of the first acquisition module is under a fixed light source. For example, the solder joints on the surface of the circuit board are made of metal. If there are no stains, its gloss or gray value is within a fixed range. If the gray value extracted from the acquired image or the acquired gloss is not within a fixed range, it indicates that there are stains. By dividing the circuit board into multiple areas and analyzing whether each area is stained, the amount of stains can be counted, thereby reflecting the degree of contamination of the entire circuit board.

[0042] The second acquisition module is used to collect wastewater data. In this embodiment, the second acquisition module is a sensor that can quantify the degree of wastewater pollution, such as an electricity meter or a concentration meter. No specific limitation is made here. It is fixed on the cleaning tank 1, and the detection end is located inside the detection tank 1. Alternatively, an independent detection tank can be added to the bottom of the cleaning tank 1. The wastewater in the detection tank 1 is quantitatively introduced into the detection tank, and the second acquisition module detects it inside the detection tank. This is more accurate. For example, the conductivity of the wastewater in the detection tank can be detected by the electricity meter to determine the degree of wastewater pollution. Combined with the data on the surface of the circuit board, the amount of detergent used, i.e., the amount of water passing through the cleaning mechanism 4, can be further determined.

[0043] The cleaning recognition module is used to input surface data and wastewater data into the trained cleaning recognition model and output washing data. The washing data is used as the adjustment parameter of the pressurization system 6. Specifically, it adjusts the solenoid valve 44. In this embodiment, the water tank 5 contains water mixed with detergent. By controlling the water flow through the solenoid valve 44, the amount of detergent used for cleaning can be controlled.

[0044] The training method for the cleaning recognition model is as follows: Under experimental conditions, multiple sets of historical cleaning feature data and corresponding cleaning water usage are collected. The cleaning water usage is the amount of detergent. The cleaning feature data are gray values ​​or gloss converted from surface data and conductivity or resistivity converted from wastewater data.

[0045] Those skilled in the art can simulate historical cleaning characteristic data and clean the same historical cleaning characteristic data with different cleaning water dosages. Then, based on the effect of cleaning the circuit board, the best set of cleaning water dosages corresponding to the set of historical cleaning characteristic data can be selected. By simulating different historical cleaning characteristic data, multiple sets of historical cleaning characteristic data and corresponding cleaning water dosages can be obtained.

[0046] Historical cleaning feature data and corresponding cleaning water consumption are converted into a set of feature vectors. These feature vectors are used as input to a cleaning identification model. The model outputs the predicted cleaning water consumption for each set of historical cleaning feature data, with the actual cleaning water consumption corresponding to that set as the prediction target. The training objective is to minimize the sum of prediction errors for all historical cleaning feature data. The prediction error is calculated using the formula z. p =(αp-μp) 2 , where z p The prediction error is represented by p, where p is the number of the historical cleaning feature data, αp is the predicted cleaning water consumption corresponding to the p-th group of historical cleaning feature data, and μp is the actual cleaning water consumption corresponding to the p-th group of historical cleaning feature data. The cleaning recognition model is trained until the sum of the prediction errors converges, at which point training stops.

[0047] The cleaning and identification model is either a deep neural network model or a deep belief network model.

[0048] It is worth mentioning that the cleaning recognition model outputs the amount of cleaning water used, which is used as a control parameter for the solenoid valve 44. This parameter needs to be converted into a control signal for the solenoid valve 44. The specific relationship between the amount of cleaning water used and the control signal is determined by those skilled in the art through statistical experiments based on the specific model of the solenoid valve 44, and will not be elaborated here.

[0049] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A cleaning device for tin-plated circuit board production, characterized in that, include: Cleaning box (1), with both ends through and higher than the middle, is used for the entry and exit of circuit boards; A belt conveyor (2) is installed at both ends of the cleaning box (1) for conveying circuit boards; The positioning and conveying mechanism (3) is sealed and installed on the cleaning box (1) for positioning and conveying the circuit board. The positioning and conveying mechanism (3) includes: a guide plate (31) with conveying guide wheels (32) uniformly arranged through its surface, and the conveying guide wheels (32) are rotatably and sealed to the guide plate (31); a synchronous pulley (33) fixed to the end of the conveying guide wheel (32); a synchronous toothed belt (34) sleeved on the synchronous pulley (33) for linkage between multiple conveying guide wheels (32); and a sealing plate (35) fixedly and sealed to the bottom of the guide plate (31), and the sealing plate (35) is fixedly and sealed to the cleaning box (1). The cleaning mechanism (4) is distributed on the upper and lower sides of the circuit board and is used to rinse the circuit board from multiple angles. The cleaning mechanism (4) includes: a main pipe (41) which is rotatably and sealed to the cleaning box (1); a branch pipe (42) which is rotatably and sealed to the end of the main pipe (41); and a nozzle (43) which is rotatably and sealed to the branch pipe (42). The outer periphery of the end of the main pipe (41) is fixed with an edge (411), and the end of the branch pipe (42) is fixed with a connector (421), and the connector (421) is rotatably and sealed to the edge (411). A water wheel (422) is fixed inside the branch pipe (42). Water flows into the main pipe (41) and impacts the water wheel (422) to rotate, causing the water wheel (422) to drive the branch pipe (42) to rotate. Similarly, the nozzle (43) rotates to rinse the circuit board from multiple angles. Water tank (5), fixed to the surface of cleaning tank (1), is used to provide water source; The pressurization system (6) is fixed to the surface of the cleaning tank (1) and is used to extract water from the water tank (5), pressurize it, and supply it to the cleaning mechanism (4).

2. The cleaning device for tin-plated circuit board production according to claim 1, characterized in that, It also includes: a first acquisition module, used to acquire data from the surface of the circuit board; The second acquisition module is used to acquire wastewater data; the cleaning recognition module is used to input surface data and wastewater data into the trained cleaning recognition model and output washing data, which is used as the adjustment parameter of the pressurization system (6).

3. The cleaning device for tin-plated circuit board production according to claim 1, characterized in that, Both ends of the cleaning box (1) are fixed with baffles (11), and the bottom of the cleaning box (1) is fixed with a drain pipe (12).

4. The cleaning device for tin-plated circuit board production according to claim 1, characterized in that, The belt conveyor mechanism (2) includes a first conveyor belt (21), a second conveyor belt (22) and a support roller (23). There are multiple support rollers (23), and both ends of the multiple support rollers (23) are rotatably connected to the cleaning box (1). Both ends of the first conveyor belt (21) and the second conveyor belt (22) are sleeved on the support rollers (23).

5. A cleaning device for tin-plated circuit board production according to claim 1, characterized in that, The pressurization system (6) includes: a pressurization pump (61) fixed to the cleaning box (1); Water inlet pipe (62), the water tank (5) is connected to the input end of booster pump (61) through water inlet pipe (62); The main pipe (41) is connected to the output end of the booster pump (61) through the water outlet pipe (63). The end of the main pipe (41) is rotatably sealed with a rotary joint (44), and the end of the water outlet pipe (63) is fixedly connected to the end of the rotary joint (44). The solenoid valve (64) is fixed on the water outlet pipe (63) and is used to control the flow rate in the water outlet pipe (63).

6. A cleaning device for tin-plated circuit board production according to claim 5, characterized in that, A steam generating mechanism (7) is fixed to the outer surface of the cleaning box (1). The steam generating mechanism (7) includes: a fixing box (71) fixed to the cleaning box (1); The heating element (72) is fixed inside the cleaning box (1), and the inner cavity of the heating element (72) is connected to the output end of the booster pump (61) through the water outlet pipe (63); An air pump (73) is fixed inside a fixed box (71), and its input end is connected to the inner cavity of the heating element (72); An air nozzle (74) penetrates the surface of the cleaning box (1) and is fixed to the fixing box (71). The output end of the air pump (73) is connected to the air nozzle (74).

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