Multi-stage water blocking device for horizontal line of PCB

Abstract

The utility model discloses a kind of multi-stage water retaining roller devices of PCB horizontal line prevents medicine water slot, including respectively being set in the material inlet wheel group and the material outlet wheel group of two sides of machine table main body, material inlet wheel group is sequentially provided with first high-level roller set, low roller set and second high-level roller set to material outlet wheel group direction, each roller set is two layers of roller structure for clamping the upper and lower surfaces of PCB, first high-level roller set and second high-level roller set are located on same horizontal line, and higher than the material inlet wheel group, material outlet wheel group of two sides, low roller set is located below first high-level roller set and second high-level roller set. The utility model solves the problem that liquid is not completely scraped in the prior art for the way of preventing medicine water slot of PCB, medicine water is wasted, and environment and equipment are easily damaged.

Description

Technical Field

[0001] This utility model relates to the field of PCB manufacturing processes, and in particular to a multi-stage water-blocking device for preventing chemical spillage in PCB horizontal lines. Background Technology

[0002] In existing technologies, the prevention of chemical cross-contamination in PCB pretreatment horizontal lines mainly relies on the following solutions, but all have significant drawbacks. For example, the traditional single-roller structure cannot completely scrape the solution, and chemical residue leads to cross-contamination. The single-roller structure can only scrape 60%-70% of the solution from the board surface, with actual measured residual amounts >5ml / board (board size 610mm×480mm). This results in a concentration fluctuation of >15% after cross-contamination (e.g., if pickling solution mixes into the micro-etching tank, the H2SO4 concentration increases from 8.5% to 10%), and the frequency of replenishment increases to twice per shift, significantly increasing the cost of chemical usage. In addition, existing water-blocking rollers have poor adaptability and cannot adapt to board thicknesses ranging from 0.3-3.0mm (getting stuck on thin boards and not scraping the solution cleanly on thick boards), requiring frequent replacement of roller assemblies. There are also problems with the silicone rollers wearing out quickly, having a short replacement cycle, and high maintenance costs.

[0003] Besides the traditional methods mentioned above, the currently used fixed scraper method has several drawbacks. The hard scraper easily scratches the board surface, leading to a decrease in yield. Furthermore, the collision between the scraper and the roller exacerbates wear on transmission components, and the wear generates microparticles, increasing the difficulty of wastewater treatment. For example, using an air knife for purging results in high energy consumption and environmental pollution from the dispersed chemical mist. Using absorbent cotton rollers leads to fiber shedding that contaminates the board surface, potentially causing copper particles to appear in subsequent electroplating processes.

[0004] In view of this, this technical solution proposes a multi-stage water-blocking wheel device, which uses three sets of silicone rollers arranged in a staggered, high-low-high step configuration to form a three-stage liquid film breaking action of squeezing, releasing, and re-squeezing, which greatly reduces the risk of cross-contamination and waste between chemical tanks and saves chemical costs. Utility Model Content

[0005] The present invention aims to at least partially solve one of the technical problems in the related technologies. Therefore, the main objective of this invention is to provide a multi-stage water-blocking device for preventing chemical cross-contamination in PCB horizontal lines, thereby addressing the problems of incomplete scraping, excessive chemical waste, environmental pollution, and equipment damage associated with existing methods for preventing chemical cross-contamination in PCBs.

[0006] To achieve the above objectives, this utility model provides a multi-stage water-blocking roller device for preventing chemical cross-contamination in PCB horizontal lines, comprising an infeed roller assembly and an outlet roller assembly respectively disposed on both sides of the machine body. The feed roller assembly is provided with a first high roller assembly, a low roller assembly, and a second high roller assembly in sequence towards the discharge roller assembly. Each roller assembly is a two-layer roller structure used to clamp the upper and lower surfaces of the PCB board. The first high roller assembly and the second high roller assembly are located on the same horizontal line and are higher than the feed roller assembly and the discharge roller assembly on both sides. The low roller assembly is located below the first high roller assembly and the second high roller assembly.

[0007] As a further embodiment of this utility model, the surfaces of the first high-position roller assembly, the low-position roller assembly, and the second high-position roller assembly are all provided with micro-textures with a depth between 20-50μm, which are used to cause the liquid medicine on the PCB board to form droplets.

[0008] As a further embodiment of this utility model, the first high-position roller assembly, the low-position roller assembly, and the second high-position roller assembly are all silicone roller assembly structures.

[0009] As a further embodiment of this utility model, the first high-position roller group, the low-position roller group, and the second high-position roller group are all fixed at both ends to the two sides of the machine body, on the slide rail bracket for adjusting the spacing between each roller group.

[0010] As a further embodiment of this utility model, the center distance between each adjacent wheel of the first high-position wheel group, the low-position wheel group and the second high-position wheel group is 48mm-52mm, and the difference in wheel surface height between the first high-position wheel group, the second high-position wheel group and the low-position wheel group is 10mm.

[0011] As a further improvement of this utility model, the slide rail bracket is provided with an adjustment knob for manually fine-tuning the spacing of the roller assembly.

[0012] The beneficial effects of this utility model are as follows: This technical solution utilizes three (or more) sets of rollers arranged in a staggered pattern (first high roller set, low roller set, and second high roller set) to ensure that the PCB board undergoes a continuous undulating path of diagonal upward, diagonal downward, and diagonal upward during transport. Gravity and compression are used to promote the full dripping of the chemical solution. Furthermore, the 20-50μm micro-texture design on the roller surface further accelerates the detachment of the chemical solution droplets from the board surface, reducing the residual amount to less than 1 / 3 of that of traditional methods. This significantly reduces chemical waste and the frequency of replenishment, effectively avoids tank contamination caused by chemical cross-contamination (concentration fluctuation <15%), and comprehensively improves production efficiency and environmental benefits. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of this utility model 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 some embodiments of the technical solutions of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0014] Figure 1 This is a top view schematic diagram of the various roller groups and the feed and discharge roller groups installed on the main body of the machine in this utility model.

[0015] Figure 2 This is a schematic diagram showing the movement trajectory of the PCB board between each roller group during the operation of the structure of this utility model.

[0016] Figure 3 This is a side view of the overall structure of this utility model.

[0017] Figure 4 This is a top view of the structure of this utility model in actual operation.

[0018] Figure 5 This is a schematic diagram of the overall structure of this utility model after it is assembled with other workstations.

[0019] 1 Machine body 14 Low-position roller assembly 10 Feed wheel assembly 15 Slide rail bracket 11 Discharge wheel set 16 Adjustment knob 12 First high-position wheel assembly 2 PCB board 13 Second high-position roller assembly Detailed Implementation

[0020] as follows: Please see the appendix Figure 1-5 , In this design, a feed roller assembly (10) and a discharge roller assembly (11) are installed on both sides of the main body (1) of the machine, serving as the entrance and exit of the PCB board (2). From the feed roller assembly (10) to the discharge roller assembly (11), a first high roller assembly (12), a low roller assembly (14), and a second high roller assembly (13) are arranged in sequence. Each roller assembly consists of two layers of wheels, which clamp the upper and lower surfaces of the PCB board (2) for transport. The first high roller assembly (12) and the second high roller assembly (13) are located on the same horizontal line, and this height is higher than the positions of the feed roller assembly (10) and the discharge roller assembly (11) on both sides. The low roller assembly (14) is located below the first high roller assembly (12) and the second high roller assembly (13), forming a stepped structure with varying heights.

[0021] Specifically, when the PCB board (2) enters from the feed roller group (10), it will tilt upwards to the first high roller group (12), where a portion of the liquid medicine is initially squeezed out. Then it will tilt downwards to the low roller group (14), where gravity will cause the liquid medicine to collect and drip. Then it will tilt upwards to the second high roller group (13), where it will be squeezed again to completely remove the residue. Finally, it will be discharged through the discharge roller group (11). During this process, the efficiency of chemical removal is significantly improved through multiple squeezing and gravity release actions, solving the problem of incomplete scraping. The residual amount of chemical solution is greatly reduced from >5ml / board in the traditional method, reducing chemical waste and replenishment frequency (reduced from 2 times / shift), thereby saving chemical costs and reducing the risk of chemical cross-contamination (such as the concentration fluctuation of pickling solution mixed into the micro-etching tank <15%), reducing environmental pollution and equipment wear, and adapting to PCB boards (2) with different thicknesses of 0.3-3.0mm, avoiding the problems of jamming or incomplete scraping, and extending the equipment maintenance cycle. It is conceivable that if the PCB board (2) enters from one side of the feed wheel and runs at an angle after operation, the subsequent boards will need to be reversed.

[0022] Reference Appendix Figure 1 In a preferred embodiment of this utility model, the surfaces of the first high-position roller group (12), the low-position roller group (14), and the second high-position roller group (13) are provided with micro-textures with a depth between 20-50μm, so that when the PCB board (2) passes through the roller group, the medicine attached to the board surface can be more quickly gathered to form droplets.

[0023] In practice, when the solution forms large droplets on the plate surface, it will drip off more easily due to gravity, rather than remaining as a difficult-to-remove liquid film. This further reduces the amount of residual solution, lowers the risk of cross-contamination, and effectively saves on the amount of solution used.

[0024] Reference Appendix Figure 2 In a preferred embodiment of this utility model, the first high-position roller group (12), the low-position roller group (14), and the second high-position roller group (13) of this solution all adopt a silicone roller group structure, so that when the roller group is transporting the PCB board (2) on both the upper and lower sides, it can make closer contact with and clamp the PCB board (2) of different thicknesses (especially suitable for board thickness range of 0.3-3.0mm).

[0025] Reference Appendix Figure 1In a preferred embodiment of this utility model, the first high-position roller group (12), the low-position roller group (14), and the second high-position roller group (13) are all fixed at both ends on the slide rail brackets (15) on both sides of the main body of the machine (1). They can be flexibly adjusted by the slide rail. For example, when producing PCB boards (2) of different sizes or when it is necessary to optimize the chemical scraping effect, the operator can directly adjust the relative position of each roller group on the slide rail bracket (15) to ensure that the roller group can always clamp the PCB board (2) at the best spacing, thereby improving the adaptability of the equipment to different production needs.

[0026] Reference Appendix Figure 1 , 2 In a preferred embodiment of this utility model: In this solution, the center distance between adjacent rollers of the first high roller group (12), the low roller group (14), and the second high roller group (13) is 48mm-52mm, and the height difference between the roller surfaces of the high roller group and the low roller group (14) is 10mm, so that the PCB board (2) can fully contact each roller group to achieve effective scraping during the high and low operation process, and avoid the board surface from shaking due to excessive spacing or the board jamming due to insufficient spacing.

[0027] Reference Appendix Figure 1 In a preferred embodiment of this utility model, an adjustment knob (16) is also provided on the slide rail bracket (15), so that the operator can precisely control the distance between the first high-position roller group (12), the low-position roller group (14) and the second high-position roller group (13) by manual fine adjustment. The manual fine adjustment mechanism greatly improves the flexibility and convenience of equipment debugging.

[0028] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made based on the present utility model's technical concept and the contents of the present utility model's technical solution specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A multi-stage water-blocking device for preventing chemical cross-contamination in PCB horizontal lines, characterized in that, include The feed wheel assembly and discharge wheel assembly are respectively located on both sides of the main body of the machine. The feed roller assembly is provided with a first high roller assembly, a low roller assembly, and a second high roller assembly in sequence towards the discharge roller assembly. Each roller assembly is a two-layer roller structure used to clamp the upper and lower surfaces of the PCB board. The first high roller assembly and the second high roller assembly are located on the same horizontal line and are higher than the feed roller assembly and the discharge roller assembly on both sides. The low roller assembly is located below the first high roller assembly and the second high roller assembly.

2. The multi-stage water-blocking device for preventing chemical cross-contamination in PCB horizontal lines according to claim 1, characterized in that, The surfaces of the first high-position roller group, the low-position roller group, and the second high-position roller group are all provided with micro-textures with a depth between 20-50μm, which are used to cause the liquid medicine on the PCB board to form droplets.

3. The multi-stage water-blocking device for preventing chemical cross-contamination in PCB horizontal lines according to claim 1, characterized in that, The first high-position roller assembly, the low-position roller assembly, and the second high-position roller assembly are all silicone roller assembly structures.

4. The multi-stage water-blocking device for preventing chemical cross-contamination in PCB horizontal lines according to claim 1, characterized in that, The first high-position roller group, the low-position roller group, and the second high-position roller group are all fixed at both ends to the two sides of the machine body, on the slide rail bracket used to adjust the spacing between each roller group.

5. The multi-stage water-blocking device for preventing chemical cross-contamination in PCB horizontal lines according to claim 1, characterized in that, The center distance between adjacent wheels in the first high-position wheel group, the low-position wheel group, and the second high-position wheel group is 48mm-52mm, and the difference in wheel surface height between the first high-position wheel group, the second high-position wheel group, and the low-position wheel group is 10mm.

6. The multi-stage water-blocking device for preventing chemical cross-contamination in PCB horizontal lines according to claim 4, characterized in that, The slide rail bracket is equipped with an adjustment knob for manually fine-tuning the spacing of the roller assembly.

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