Circuit board film removing circulating system

Abstract

The utility model discloses a circuit board film-removing circulating system, which comprises a conveying device and a spraying device, the conveying device comprises a roller group arranged along the conveying direction, the spraying device comprises a spraying pipe group arranged along the conveying direction, and the spraying pipe group is used for spraying film-removing liquid medicine to a circuit board conveyed along the roller group; the spraying device further comprises a filtering device and an adding device; the spraying device further comprises a main tank; the filtering device comprises a collecting tank and a residue filtering part, the residue filtering part is connected to the main tank, the collecting tank is used for collecting the sprayed film-removing liquid medicine and outputting the film-removing liquid medicine to the residue filtering part, and the residue filtering part is used for filtering the film-removing liquid medicine and outputting the filtered film-removing liquid medicine to the main tank; the adding device comprises a stock solution tank, a stirring tank, a storage tank and a metering tank which are connected in sequence, the metering tank is connected to the main tank, and the stock solution tank is used for outputting stock solution to the stirring tank; a stirring mechanism is arranged in the stirring tank, the stirring mechanism is used for stirring and mixing an additive solution and a stock solution which are added into the stirring tank to form a film-removing liquid medicine, and the storage tank is used for storing the film-removing liquid medicine formed by stirring and mixing; the metering tank comprises an overflow pipe and a bottom pipe, one end of the overflow pipe is communicated with the side wall of the metering tank and extends upwards to a set position in the metering tank, the bottom pipe is communicated between the bottom of the metering tank and the main tank, the bottom pipe is provided with a switch valve, and the metering tank is used for receiving quantitative film removing liquid medicine from the storage tank and outputting the liquid medicine to the main tank; the spraying pipe set is used for sucking the film removing liquid medicine from the main groove and spraying the liquid medicine to the circuit board. The utility model provides the circulating system which fully utilizes the film-removing liquid medicine and keeps the impurity content and the concentration of the film-removing liquid medicine stable.

Description

Technical Field

[0001] The utility model relates to the field of circuit board manufacturing, in particular to a circuit board film removal circulation system. Background Art

[0002] During the production of circuit boards, the required circuit patterns need to be etched on the board surface through development and etching. After the etching of the circuit board is completed, the dry film remaining on the board surface needs to be removed by spraying sodium hydroxide solution. In the process of spraying and removing the film, making full use of the liquid raw materials, improving the utilization rate of the liquid, and avoiding waste can significantly reduce production costs, and at the same time can also reduce the amount of wastewater, which is beneficial to environmental protection.

[0003] Therefore, it is very necessary to design a production system for the circuit board film removal process to fully utilize the spray solution, while ensuring that the impurity content and concentration of the solution being used are maintained within a reasonable range to ensure the stability of the circuit board production quality. Utility Model Content

[0004] The utility model aims to provide a circuit board film stripping circulation system to solve the problems of film stripping solution waste and unstable impurity content and concentration of the solution.

[0005] The utility model provides a circuit board film removal circulation system, comprising a conveying device and a spraying device, the conveying device comprising a roller group arranged along the conveying direction, the spraying device comprising a nozzle group arranged along the conveying direction, the nozzle group being used to spray film removal liquid on the circuit board conveyed along the roller group; further comprising a filtering device and an adding device, the spraying device further comprising a main tank; the filtering device comprising a collecting tank and a filter residue part, the filter residue part being connected to the main tank, the collecting tank being used to collect the film removal liquid after spraying and output the film removal liquid to the filter residue part, the filter residue part being used to filter the film removal liquid and output it to the main tank; the adding device comprising a raw liquid tank, a stirring tank, a storage tank and The metering tank is connected to the main tank, and the stock liquid tank is used to output the stock liquid to the stirring tank; a stirring mechanism is arranged inside the stirring tank, and the stirring mechanism is used to stir and mix the added liquid and the stock liquid added to the stirring tank to form a defilming solution, and the storage tank is used to store the defilming solution formed by stirring and mixing; the metering tank includes an overflow pipe and a bottom pipe, one end of the overflow pipe is connected to the side wall of the metering tank and extends upward to a set position inside the metering tank, the bottom pipe is connected between the bottom of the metering tank and the main tank, and the bottom pipe is provided with a switch valve, the metering tank is used to receive a certain amount of defilming solution from the storage tank and output it to the main tank; the spray pipe group is used to absorb the defilming solution from the main tank and spray it on the circuit board.

[0006] It can be seen from the above scheme that after the spraying device sprays the defilming liquid on the circuit board, the liquid mixed with the membrane residue will be collected by the collecting tank and the membrane residue will be filtered through the filter residue part. The filtered defilming liquid has effective liquid components, which are output to the main tank, absorbed by the nozzle group and reused for spraying. Since the concentration of the effective components of the liquid flowing into the main tank after spraying is reduced, it is necessary to supplement the effective components by the adding device to maintain the concentration unchanged. The adding device can stir and prepare the defilming liquid with a higher concentration and output it to the main tank quantitatively. Therefore, through the circulating spraying and filtration of the liquid in the main tank and the quantitative liquid supplementation by the adding device, the defilming liquid can be fully utilized, and the impurity content and concentration of the liquid can be maintained stable, thereby reducing production costs and environmental pollution risks.

[0007] A preferred solution is that a heating unit and a cooling unit are provided in the main tank, and the heating unit and the cooling unit are used to stabilize the temperature of the film removal solution.

[0008] It can be seen that by controlling the heating unit and the cooling unit one hot and one cold, the temperature of the film removal solution can be made to fluctuate slightly above and below the optimal temperature, maintaining a constant temperature and achieving the best production effect.

[0009] A further solution is that a circulation pump is arranged outside the main tank, and the main tank includes a liquid inlet and a liquid outlet, which are respectively connected to the two ends of the circulation pump, and the liquid inlet and the liquid outlet are respectively arranged at opposite ends in the length direction of the main tank.

[0010] It can be seen that setting up a circulating pump can make the defilming solution in the longer main tank circulate, maintain the temperature of the defilming solution in the main tank, and keep the concentration uniform.

[0011] A further solution is that the filter residue part includes a reflux cylinder, a slag receiving funnel and an inclined filter screen frame, the collecting trough guides the defilming liquid after spraying to fall into the upper part of the first side of the filter screen frame, the slag receiving funnel is located at the lower part of the second side of the filter screen frame, the first side of the filter screen frame is higher than the second side, the reflux cylinder is located at the lower part of the filter screen frame, and the reflux cylinder is used to collect the defilming liquid filtered by the filter screen frame and overflow it to the main trough.

[0012] It can be seen that the defilming liquid mixed with membrane residue flows through the filter frame, and the filtered defilming liquid flows into the reflux cylinder and flows back to the main tank to prevent the membrane residue from flowing into the main tank. The membrane residue is gradually filtered along the inclined trend of the filter frame and falls into the residue receiving funnel for subsequent recycling. Since the filtered defilming liquid may still contain certain impurities, a reflux cylinder is set to receive the defilming liquid and overflow to the main tank. The impurities can be settled in the reflux cylinder and the impurities can be fully removed.

[0013] A further solution is that the capacity of the stirring tank is greater than or equal to twice the capacity of the stock liquid tank, and the capacity of the storage tank is greater than or equal to twice the capacity of the stirring tank.

[0014] It can be seen that the progressive capacity can meet the needs of mixing and storing the defilming solution.

[0015] A further solution is that the nozzle group includes a suction pump, a main body and several branch nozzles. The suction pump is arranged in the main tank, and the several branch nozzles are connected to the main body and arranged in sequence along the conveying direction. The suction pump is used to pump the defilming solution into the main body and spray it out from the branch nozzles.

[0016] It can be seen that after the liquid suction pump absorbs the film removal liquid from the main tank, it is first pumped into the main body, and then flows from the main body into each branch nozzle, and is sprayed out from multiple nozzles on the branch nozzle, so that the liquid can be evenly sprayed along the transmission direction of the circuit board.

[0017] A further solution is that the main tank includes a first tank body and a second tank body arranged along the length direction thereof, and liquid suction pumps are provided inside the first tank body and the second tank body.

[0018] It can be seen from this that the main tank can be divided into multiple tanks to better control the circulation of the defilming solution and facilitate the maintenance of subsequent production lines.

[0019] A further solution is that the main tank also includes a connecting channel, a first end of the connecting channel is connected to the first tank body, a second end of the connecting channel is connected to the second tank body, the second end of the connecting channel is higher than the first end, the metering tank is connected to the second tank body, and the main pipes connected to the suction pumps inside the first tank body and the second tank body are not connected to each other.

[0020] It can be seen that the overflow connection between the first tank body and the second tank body is set to achieve different concentrations of the drug solution in different tank bodies. By using an independent suction pump to absorb and spray, the spray pipes located at different positions in the transmission direction of the circuit board can spray defilming drug solutions of different concentrations, and the circuit board is sprayed with a gradient of drug solution concentration, so that the defilming effect on the circuit board is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the utility model. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the flow direction of the film removal solution in one embodiment of the utility model.

[0023] Figure 2 It is a schematic diagram of an embodiment of the utility model.

[0024] Figure 3 It is a schematic diagram of a metering tank according to an embodiment of the utility model.

[0025] Figure 4It is a schematic diagram of a heating unit and a cooling unit according to an embodiment of the utility model.

[0026] Figure 5 It is a schematic diagram of the main slot of an embodiment of the utility model.

[0027] Figure 6 It is a schematic diagram of a spray device according to an embodiment of the utility model.

[0028] Figure 7 It is a schematic diagram of a first tank body and a second tank body in one embodiment of the utility model. DETAILED DESCRIPTION

[0029] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0031] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0032] Reference Figures 1 to 7 The present embodiment provides a circuit board defilming circulation system, including a conveying device, a spraying device, a filtering device and a adding device. The conveying device includes a roller group 11 arranged in sequence along the conveying direction, including two upper and lower rows of roller groups 11. The circuit board 5 can be conveyed between the two rows of roller groups 11. The spraying device includes two upper and lower rows of nozzle groups 21 arranged along one side of the conveying direction. The upper and lower rows of nozzle groups 21 can simultaneously spray defilming liquid on the upper and lower surfaces of the circuit board 5 to defilm.

[0033] The filtering device includes a collecting tank 31 and a filter residue part, and the spraying device includes a main tank 22. The filter residue part is connected to the main tank 22. The collecting tank 31 is located at the lower part of the conveying device and can be used to collect the demembraning liquid mixed with membrane residue after spraying. The collected demembraning liquid flows into the filter residue part for filtration. After filtering the membrane residue, the demembraning liquid flows back and is output to the main tank 22.

[0034] The adding device is used to add a high-concentration film removal solution to the main tank 22 to maintain a constant concentration of the film removal solution in the main tank 22. The adding device includes a stock solution tank, a stirring tank, a storage tank and a metering tank 44 connected in sequence, and the metering tank 44 is connected to the main tank 22. The stock solution tank is used to output the stock solution to the stirring tank. The stirring tank is provided with a stirring mechanism inside, which can stir and mix the stock solution and the added liquid added thereto to form a film removal solution. The added liquid is generally pure water and other additives, which are used to mix with the stock solution in a proportion to form a film removal solution with a suitable concentration component. The mixed film removal solution will be output to the storage tank for storage. It should be noted that the concentration of the film removal solution stored in the storage tank is higher than the concentration of the film removal solution in the main tank 22.

[0035] When the concentration of the liquid in the main tank 22 decreases, the metering tank 44 can receive a certain amount of the film removal liquid from the storage tank and output it to the main tank 22. Figure 3 As shown, the metering tank 44 includes an overflow pipe 441 and a bottom pipe 442, one end of the overflow pipe 441 is connected to the side wall of the metering tank 44 near the bottom and extends into the inside of the metering tank 44, and one end of the overflow pipe 441 extends upward inside the metering tank 44 to a set position, for example, a capacity of ten liters. The storage tank is connected to the metering tank 44 through a pipeline and outputs the defilming solution. When the water level of the defilming solution in the metering tank 44 rises to ten liters, it will flow out from one end of the overflow pipe 441 and will no longer rise, thereby ensuring that the volume of the solution in the metering tank 44 is constant, and the overflowing defilming solution can flow back to the storage tank for reuse. The metering tank 44 is connected to the main tank 22 via a bottom pipe 442. The bottom pipe 442 is connected to the bottom of the metering tank 44. The bottom pipe 442 is provided with a switch valve 443 for controlling the on and off. When the metering tank 44 is full, the switch valve 443 can be opened to output the defilming solution to the main tank 22. It should be noted that when opening the switch valve 443, the connection between the storage tank and the metering tank 44 needs to be closed to prevent too much defilming solution from flowing into the main tank 22.

[0036] After being filtered and input with new liquid, the film removal liquid in the main tank 22 will be sucked by the spray pipe group 21 and sprayed on the circuit board. The film removal liquid after spraying enters a new cycle.

[0037] In this embodiment, if Figure 2 and Figure 4 As shown, a heating unit 221 and a cooling unit 222 are provided in the main tank 22, wherein the heating unit 221 is a heating rod, and the cooling unit 222 is a cooling threaded tube, in which cold water flows, and the temperature of the film removal solution can be slightly fluctuated above and below a specific temperature through the heating unit 221 and the cooling unit 222, thereby stabilizing the temperature of the solution. It should be noted that, according to the different lengths of the main tank 22, multiple groups of heating units 221 and cooling units 222 can be evenly arranged to better control the temperature.

[0038] In this embodiment, a circulation pump 223 is arranged outside the main tank 22. The main tank 22 includes a liquid inlet and a liquid outlet. The liquid inlet and the liquid outlet are respectively arranged at opposite ends in the length direction of the main tank 22 to ensure that the liquid inlet and the liquid outlet are far enough apart. The circulation pump 223 fully promotes the circulation of the defilming solution inside the main tank 22, so that the concentration uniformity of the defilming solution at various places in the main tank 22 is improved.

[0039] In this embodiment, the filter residue section includes a reflux cylinder 321, a residue receiving funnel 322 and an inclined filter screen frame 323. The collection tank 31 collects the film removal liquid mixed with film residue after spraying and guides the film removal liquid to the upper part of the first side of the filter screen frame 323. The residue receiving funnel 322 is located at the lower part of the second side of the filter screen frame 323. The first side of the filter screen frame 323 is higher than the second side. Since the filter screen frame 323 is inclined, the film removal liquid will flow from the higher first side to the second side, wherein the film residue will fall into the residue receiving funnel 322 along the filter screen frame 323 for collection, and the filtered film removal liquid will flow out of the filter screen frame 323. In particular, the filter residue section is generally provided with an electric brush to clean the filter screen frame 323 to promote the film residue remaining on the filter screen frame 323 to fall into the residue receiving funnel 322. A reflux cylinder 321 is provided at the lower part of the filter frame 323. Since there may still be fine membrane residue impurities in the membrane removal liquid after filtration, the membrane removal liquid is received by the reflux cylinder 321, and then overflows from the top to the main tank 22 through the overflow of the reflux cylinder 321, while the membrane residue impurities settle to the bottom of the reflux cylinder 321.

[0040] In this embodiment, the capacity of the stirring tank is greater than or equal to twice the capacity of the raw liquid tank, and the capacity of the storage tank is greater than or equal to twice the capacity of the stirring tank. In particular, the raw liquid tank is set to 200 liters, the stirring tank is set to 500 liters, and the storage tank is set to 1000 liters.

[0041] In this embodiment, if Figure 6 As shown, the nozzle group 21 includes a liquid suction pump 211, a main body 212 and a plurality of branch nozzles 213. The liquid suction pump 211 is arranged in the main tank 22. The main body 212 is extended along the conveying direction. The plurality of branch nozzles 213 are sequentially arranged along the conveying direction and connected to the main body 212. The liquid suction pump 211 is used to pump the film removal liquid into the main body 212. Each branch nozzle 213 is provided with a plurality of nozzles 214, which are arranged perpendicular to the conveying direction. The film removal liquid is sequentially pumped into the main body 212, the branch nozzles 213 and the nozzles 214 and then sprayed out. In particular, the film removal liquid sucked by the liquid suction pump 211 needs to pass through a filter screen and filter cotton before being pumped into the main body 212 to reduce the impurity content.

[0042] In this embodiment, if Figure 7As shown, the main tank 22 is provided with a first tank body 224 and a second tank body 225 along its length direction, and a liquid suction pump 211 is provided inside the two tank bodies. In particular, the two tank bodies are provided with a heating unit 221 and a cooling unit 222. In addition, the main tank 22 also includes a connecting channel 226, the first end of the connecting channel 226 is connected to the first tank body 224, and the second end is connected to the second tank body 225. The second end of the connecting channel 226 is higher than the first end. The new liquid output by the metering tank 44 is output to the second tank body 225, and the liquid suction pump 211 and the main body 212 of the two tank bodies are not connected to each other. This structure is set so that the concentration of the defilming liquid in the second tank body 225 is higher than that in the first tank body 224. The concentration of the defilming liquid received by different positions of the circuit board along the transmission direction can be set to be different, so as to achieve a step-by-step defilming effect and better complete the defilming process.

[0043] The above embodiment only expresses one implementation method of the utility model, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A circuit board film stripping circulation system, comprising a conveying device and a spraying device, wherein the conveying device comprises a roller group arranged along the conveying direction, and the spraying device comprises a nozzle group arranged along the conveying direction, and the nozzle group is used to spray a film stripping liquid on the circuit board conveyed along the roller group, characterized in that: It also includes a filtering device and an adding device, and the spraying device also includes a main tank; The filtering device comprises a collecting tank and a filter residue part, wherein the filter residue part is connected to the main tank, the collecting tank is used to collect the film removal liquid after spraying and output the film removal liquid to the filter residue part, and the filter residue part is used to filter the film removal liquid and output it to the main tank; The adding device comprises a raw liquid tank, a stirring tank, a storage tank and a metering tank which are connected in sequence, the metering tank is connected to the main tank, and the raw liquid tank is used to output raw liquid to the stirring tank; The stirring tank is provided with a stirring mechanism inside, the stirring mechanism is used to stir and mix the added liquid and the original liquid added into the stirring tank to form the film removal solution, and the storage tank is used to store the film removal solution formed by stirring and mixing; The metering tank comprises an overflow pipe and a bottom pipe, one end of the overflow pipe is connected to the side wall of the metering tank and extends upward to a set position inside the metering tank, the bottom pipe is connected between the bottom of the metering tank and the main tank, and the bottom pipe is provided with a switch valve, and the metering tank is used to receive a fixed amount of the film removal solution from the storage tank and output it to the main tank; The spray pipe group is used to absorb the film removal solution from the main tank and spray the circuit board.

2. A circuit board film removal circulation system according to claim 1, characterized in that: A heating unit and a cooling unit are arranged in the main tank, and the heating unit and the cooling unit are used to stabilize the temperature of the film removal solution.

3. A circuit board film removal circulation system according to claim 1, characterized in that: A circulation pump is arranged outside the main tank, and the main tank comprises a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are respectively connected to two ends of the circulation pump, and the liquid inlet and the liquid outlet are respectively arranged at opposite ends in the length direction of the main tank.

4. A circuit board film removal circulation system according to claim 1, characterized in that: The filter residue part includes a reflux cylinder, a residue receiving funnel and an inclined filter screen frame, the collecting trough guides the defilming liquid after spraying to fall into the upper part of the first side of the filter screen frame, the residue receiving funnel is located at the lower part of the second side of the filter screen frame, the first side of the filter screen frame is higher than the second side, the reflux cylinder is located at the lower part of the filter screen frame, and the reflux cylinder is used to collect the defilming liquid filtered by the filter screen frame and overflow it to the main trough.

5. A circuit board film removal circulation system according to claim 1, characterized in that: The capacity of the stirring tank is greater than or equal to twice the capacity of the stock solution tank, and the capacity of the storage tank is greater than or equal to twice the capacity of the stirring tank.

6. A circuit board film removal circulation system according to any one of claims 1 to 5, characterized in that: The nozzle group includes a liquid suction pump, a main body and a plurality of branch nozzles. The liquid suction pump is arranged in the main tank. The plurality of branch nozzles are connected to the main body and arranged in sequence along the conveying direction. The liquid suction pump is used to pump the film removal solution into the main body and spray it out from the branch nozzles.

7. A circuit board film removal circulation system according to claim 6, characterized in that: The main tank comprises a first tank body and a second tank body arranged along the length direction thereof, and the liquid suction pump is arranged inside the first tank body and the second tank body.

8. A circuit board film removal circulation system according to claim 7, characterized in that: The main tank also includes a connecting channel, a first end of the connecting channel is connected to the first tank body, and a second end of the connecting channel is connected to the second tank body. The second end of the connecting channel is higher than the first end. The metering tank is connected to the second tank body, and the main pipes connected to the suction pumps inside the first tank body and the second tank body are not connected to each other.

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