PCB developing device

Abstract

The utility model discloses a printed circuit board (PCB) developing device which comprises a developing machine main body, a receiving groove is arranged in the developing machine main body, a partition plate is vertically arranged in the receiving groove, the receiving groove is divided into a front collecting groove and a rear settling groove by the partition plate, a cover plate is arranged above the settling groove, and a conveying pump and a circulating pump are respectively arranged on the cover plate. A liquid inlet pipe connected with the conveying pump is inserted into the collecting tank, and a liquid outlet pipe connected with the conveying pump is inserted into the precipitation tank. The collecting tank is used for collecting the sprayed developing solution, the conveying pump drives the developing solution to flow to the precipitation tank, the precipitation tank is used for simply precipitating the sprayed developing solution, and the circulating pump is used for pumping out the developing solution which does not contain floccules or contains less floccules on the upper layer for recycling. The liquid inlet pipes connected with the conveying pump and the circulating pump perform certain glue residue filtration through the filter screen cover, and through filtration and precipitation, the glue residue separation treatment in the spraying developing liquid is realized, and the situation that the conveying pipeline, the spraying pipeline and the spraying head are blocked by flocculation in the developing liquid is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of PCB production, in particular to a PCB developing device. Background Art

[0002] The PCB developing device is used to develop the unexposed parts of the PCB. Since the developer does not react with the exposed parts, the final pattern is that the circuit part is yellow copper and the part without the circuit is blue-green.

[0003] The development process in PCB production often uses alkaline solutions. The developer reacts with the photosensitive film that has not undergone photocuring reaction in the exposure process to dissolve it. At the same time, a spray flushing method is used to flush and remove the "glue residue" produced after the PCB development reaction.

[0004] The PCB developing device sprays the developer to flush the PCB, and the developer is recycled through a reflux cycle. Since most of the existing PCB developing devices do not have developer filtering measures, the glue residue flushed by the developer enters the developer and forms flocculent or gel-like substances after a period of use. During the circulation process, it is easy to clog the developer delivery pipes, spray pipes and spray heads, requiring regular cleaning and maintenance. If premature blockage occurs, it cannot be predicted and will take up working time for cleaning and maintenance, affecting normal production. Improvement is urgently needed. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a PCB developing device for solving the problem that the prior PCB developing device has no developer filtering measures, resulting in glue residue entering the developer and easily clogging the developer delivery pipeline, spray pipeline and spray head during the circulation process.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A PCB developing device comprises a developing machine main body, wherein a receiving groove is arranged in the developing machine main body, a partition is vertically arranged in the receiving groove, the receiving groove is divided by the partition into two independent spaces, a collecting groove and a sedimentation groove, one in front and one behind, a cover plate is arranged above the sedimentation groove, a delivery pump and a circulation pump are respectively arranged on the cover plate, a liquid inlet pipe connected to the delivery pump is inserted in the collecting groove, a liquid outlet pipe connected to the delivery pump is inserted in the sedimentation groove, a liquid inlet pipe connected to the circulation pump is inserted in the sedimentation groove, a liquid outlet end of the liquid outlet pipe connected to the circulation pump is fixedly connected with a connecting pipe, the connecting pipe is connected to a spray head above the collecting groove, and the spray head is located directly above the collecting groove.

[0008] Preferably, filter screens are installed at the liquid inlet ends corresponding to the liquid inlet pipes of the circulation pump and the delivery pump.

[0009] Preferably, the distance between the liquid inlet end corresponding to the liquid inlet pipe of the circulation pump and the bottom of the inner wall of the sedimentation tank is not less than two-thirds of the depth of the sedimentation tank, and the distance between the liquid inlet end corresponding to the liquid inlet pipe of the delivery pump and the bottom of the inner wall of the collection tank is not less than one-third of the depth of the collection tank.

[0010] Preferably, the volume of the collecting tank is not greater than the volume of the sedimentation tank.

[0011] Preferably, the delivery pump and the circulation pump are fixedly installed at a position on the top of the cover plate close to the front end and at a position on the top of the cover plate close to the rear end, respectively.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model divides a receiving tank into mutually independent collecting tanks and settling tanks by partitioning the receiving tank. The collecting tank collects the sprayed developer. The delivery pump drives the developer to flow to the settling tank. The settling tank simply settles the sprayed developer. The precipitated flocs are located at the bottom of the settling tank. The circulation pump extracts the developer without flocs or with less flocs in the upper layer for recycling. The liquid inlet pipes connected to the delivery pump and the circulation pump are both filtered for a certain amount of glue residue through a filter screen. Through filtering and precipitation, the separation of glue residue in the sprayed developer is achieved, and the occurrence of the situation that the flocs in the developer block the delivery pipeline, the spray pipeline and the spray head is reduced. The utility model has strong practicality and solves the problem that the existing PCB developing device does not have developer filtering measures, resulting in the glue residue entering the developer and clogging the developer delivery pipeline, the spray pipeline and the spray head easily during the circulation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the corresponding position of the receiving groove of the utility model;

[0016] Figure 3 It is a structural schematic diagram of the corresponding positions of the delivery pump and the circulation pump of the utility model.

[0017] In the figure: 1. developer body; 2. receiving tank; 201. collecting tank; 202. sedimentation tank; 3. partition; 4. cover plate; 5. delivery pump; 6. circulation pump; 7. connecting pipe; 8. spray head; 9. filter screen. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0019] like Figure 1-3 As shown, the utility model provides a technical solution: a PCB developing device, comprising a developing machine body 1, a receiving groove 2 is arranged in the developing machine body 1, a partition 3 is vertically arranged in the receiving groove 2, and the receiving groove 2 is divided into two independent spaces, a collecting groove 201 and a precipitation groove 202, one in front and one in the back by the partition 3, and the volume of the collecting groove 201 is not greater than the volume of the precipitation groove 202, so as to increase the precipitation time;

[0020] A cover plate 4 is arranged above the sedimentation tank 202, and a delivery pump 5 and a circulation pump 6 are arranged on the cover plate 4 respectively. The liquid inlet pipe connected to the delivery pump 5 is inserted into the collecting tank 201, the liquid outlet pipe connected to the delivery pump 5 is inserted into the sedimentation tank 202, the liquid inlet pipe connected to the circulation pump 6 is inserted into the sedimentation tank 202, and the liquid outlet end of the liquid outlet pipe connected to the circulation pump 6 is fixedly connected with a connecting pipe 7, and the liquid inlet ends corresponding to the liquid inlet pipes of the circulation pump 6 and the delivery pump 5 are both installed with filter screens 9 to prevent the rubber residue from being extracted;

[0021] The distance between the liquid inlet end corresponding to the liquid inlet pipe of the circulation pump 6 and the bottom of the inner wall of the sedimentation tank 202 is not less than two-thirds of the depth of the sedimentation tank 202, and the distance between the liquid inlet end corresponding to the liquid inlet pipe of the delivery pump 5 and the bottom of the inner wall of the collection tank 201 is not less than one-third of the depth of the collection tank 201, ensuring the distance between the liquid inlet pipe of the circulation pump 6 and the bottom of the inner wall of the sedimentation tank 202 to prevent precipitation from directly entering the liquid inlet pipe;

[0022] The delivery pump 5 and the circulation pump 6 are fixedly installed at a position near the front end and the rear end of the top of the cover plate 4 respectively. The connecting pipe 7 is connected to the spray head 8 above the collection tank 201, and the spray head 8 is located directly above the collection tank 201.

[0023] Working principle: PCB is transported in the developing machine body 1, and the spray head 8 sprays the developing solution on the PCB. The sprayed developing solution carries the glue residue on the PCB into the collecting tank 201, and the delivery pump 5 draws the developing solution in the collecting tank 201 into the sedimentation tank 202 for simple sedimentation. The flocculent or coagulated substances formed by the glue residue in the developing solution are easily deposited at the bottom of the sedimentation tank 202. The circulation pump 6 draws out the developing solution in the upper layer of the sedimentation tank 202 and then sprays it through the spray head 8 for recycling. The liquid inlet pipes connected to the delivery pump 5 and the circulation pump 6 are both filtered through the filter screen 9 to filter the glue residue to a certain extent. Through filtering and sedimentation, the separation of the glue residue in the sprayed developing solution is realized, and the occurrence of the coagulation in the developing solution blocking the delivery pipeline, the spray pipeline and the spray head 8 is reduced.

[0024] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A PCB developing device, comprising a developing machine body (1), characterized in that: A receiving tank (2) is arranged in the developing machine body (1), a partition (3) is vertically arranged in the receiving tank (2), the receiving tank (2) is divided by the partition (3) into two independent spaces, a collecting tank (201) and a sedimentation tank (202), one in front and one in the back; a cover plate (4) is arranged above the sedimentation tank (202), a delivery pump (5) and a circulation pump (6) are respectively arranged on the cover plate (4), a liquid inlet pipe connected to the delivery pump (5) is inserted into the collecting tank (201), a liquid outlet pipe connected to the delivery pump (5) is inserted into the sedimentation tank (202), a liquid inlet pipe connected to the circulation pump (6) is inserted into the sedimentation tank (202), a liquid outlet end of the liquid outlet pipe connected to the circulation pump (6) is fixedly connected to a connecting pipe (7), the connecting pipe (7) is connected to a spray head (8) above the collecting tank (201), and the spray head (8) is located directly above the collecting tank (201).

2. A PCB developing device according to claim 1, characterized in that: The liquid inlet ends corresponding to the liquid inlet pipes of the circulation pump (6) and the delivery pump (5) are both equipped with filter screens (9).

3. A PCB developing device according to claim 1, characterized in that: The distance between the liquid inlet end corresponding to the liquid inlet pipe of the circulation pump (6) and the bottom of the inner wall of the sedimentation tank (202) is not less than two-thirds of the depth of the sedimentation tank (202), and the distance between the liquid inlet end corresponding to the liquid inlet pipe of the delivery pump (5) and the bottom of the inner wall of the collection tank (201) is not less than one-third of the depth of the collection tank (201).

4. A PCB developing device according to claim 1, characterized in that: The volume of the collecting tank (201) is not greater than the volume of the sedimentation tank (202).

5. A PCB developing device according to claim 1, characterized in that: The delivery pump (5) and the circulation pump (6) are respectively fixedly mounted at a position on the top of the cover plate (4) close to the front end and at a position on the top of the cover plate (4) close to the rear end.

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