CN111472001B - Tin stripping equipment - Google Patents
Tin stripping equipment Download PDFInfo
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- CN111472001B CN111472001B CN202010364826.1A CN202010364826A CN111472001B CN 111472001 B CN111472001 B CN 111472001B CN 202010364826 A CN202010364826 A CN 202010364826A CN 111472001 B CN111472001 B CN 111472001B
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- tin
- tin stripping
- stripping
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/08—Apparatus, e.g. for photomechanical printing surfaces
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Abstract
Disclosed is a tin stripping apparatus, which may include: at least two solution tanks fluidly disconnected from each other; a tin stripping groove portion which is provided on a part of the top surfaces of the at least two solution tanks in the vertical direction and is shared by the at least two solution tanks; and a circulation portion including a first sub-circulation portion that transports the tin stripping liquid contained in the solution tank into the tin stripping section and externally circulates the tin stripping liquid together with a fluid passage for discharging the tin stripping liquid in the tin stripping section into the solution tank, and a second sub-circulation portion that internally circulates the tin stripping liquid contained in each solution tank in the corresponding solution tank. During the tin stripping process, the tin stripping liquid of each solution tank of the at least two solution tanks is subjected to external circulation between the tin stripping groove part and the corresponding solution tank for a preset time through the first sub-circulation part according to a preset sequence.
Description
Technical Field
The invention relates to the technical field of removing of metal coatings, in particular to tin removing equipment.
Background
Printed Circuit Boards (PCBs) are one of the important components in the electronics industry and are the supports for electronic components. Generally, in a process of manufacturing a printed circuit board, after a wiring pattern is formed by screen printing or a photochemical method, a conductive pattern is plated with tin to form a corrosion-resistant metal protective layer for protecting the wiring pattern, thereby protecting the wiring pattern from corrosion damage during a subsequent alkaline etching process. After the completion of the alkaline etching, it is necessary to remove the tin protective layer formed on the surface of the wiring pattern and the copper-tin alloy formed at the interface between the tin protective layer and the Cu substrate for subsequent processing.
In the tin stripping process, a tin stripping solution (also referred to as a tin stripping solution) is generally used to dissolve the tin plating layer by a chemical stripping method. For example, in the actual production process, the PCB board with the tin plating layer can be immersed in the tin stripping solution to achieve the purpose of tin stripping. However, the above-mentioned tin stripping method has problems that the tin stripping solution is not sufficiently used, tin is easily oxidized, and/or the production efficiency is low.
Disclosure of Invention
One object of the invention is to provide a tin stripping device.
An object of the present invention is to provide a tin stripping apparatus capable of solving at least one of the above problems.
The tin stripping device according to the invention can comprise: at least two solution tanks fluidly disconnected from each other; a tin stripping groove portion which is provided on a part of the top surfaces of the at least two solution tanks in the vertical direction and is shared by the at least two solution tanks; and a circulating part including a first sub-circulating part which transports the tin stripping liquid contained in the solution tank into the tin stripping groove part and externally circulates the tin stripping liquid together with a fluid passage for discharging the tin stripping liquid in the tin stripping groove part into the solution tank, and a second sub-circulating part which internally circulates the tin stripping liquid contained in each solution tank in the corresponding solution tank. During the tin stripping process, the tin stripping liquid of each solution tank of the at least two solution tanks is subjected to external circulation between the tin stripping groove part and the corresponding solution tank for a preset time through the first sub-circulation part in a preset sequence. The tin stripping groove part can comprise: a housing; the tin stripping tank is arranged in the shell; and the conveying part is arranged in the tin removing groove and comprises an upper conveying part and a lower conveying part which are provided with conveying rollers. At least one of the upper and lower conveyors (1240 a, 1240 b) further includes at least one auxiliary roller (1242), the at least one auxiliary roller (1242) being disposed between the conveyor rollers (1241) of the upper conveyor (1240 a) adjacent to each other and/or between the conveyor rollers (1241) of the lower conveyor (1240 b) adjacent to each other, the at least one auxiliary roller (1242) including brush filaments (1242-4) disposed on an outer circumferential surface thereof.
In an embodiment according to the present invention, the first sub-circulation part may include: first circulation pumps having the same number as the number of the solution tanks, each of the first circulation pumps being disposed on a corner of the top surface of the corresponding solution tank of the at least two solution tanks that is not overlapped with the tin-stripping bath section; the main infusion tube extends in parallel with the tin stripping groove part along a first horizontal direction crossed with the vertical direction and is arranged above the at least two solution tanks, and the first circulating pump is connected to the main infusion tube; and a plurality of groups of branch infusion tubes which are connected to the main infusion tube and extend into the tin removing groove part.
In an embodiment according to the invention, each set of branch infusion tubes may comprise: a vertical infusion tube extending in a vertical direction from the main infusion tube; the upper infusion tube extends from the top end of the vertical infusion tube to the upper part of the tin removing groove part along a second horizontal direction crossed with the first horizontal direction and the vertical direction; and the lower infusion tube extends from the vertical infusion tube to the lower part of the tin-stripping groove part along the second horizontal direction.
In an embodiment according to the invention, the upper infusion tube may comprise: a first sub-upper infusion tube extending from a top end of the vertical infusion tube into an upper portion of the tin-stripping groove portion and including an end portion located at a middle position of the tin-stripping groove portion in the second horizontal direction; and a second sub upper infusion tube closer to the lower infusion tube than the first sub upper infusion tube and connected to an end of the first sub upper infusion tube.
In an embodiment according to the present invention, the lower infusion tube and the second sub-upper infusion tube may include an opening that delivers the tin-stripping solution into the tin-stripping bath portion.
In an embodiment according to the present invention, at least one of the lower infusion tube and the second sub-upper infusion tube may comprise a main tube and a protrusion protruding from the main tube, and the protrusion is provided with a plurality of openings.
In an embodiment according to the present invention, when the tin stripping apparatus includes two solution tanks, the first sub-circulation portion may include two first circulation pumps. The two first circulation pumps may be disposed on adjacent corners of the top surfaces of the two solution tanks that do not overlap with the tin stripping bath section.
In an embodiment according to the present invention, the first sub-circulation part may further include the same number of filters as the number of the solution tanks. Each filter may be disposed adjacent to and in fluid communication with a respective first circulation pump.
In an embodiment according to the present invention, the fluid passage for discharging the tin stripping liquid in the tin stripping groove part to the solution tank may include the same number of flow guides as the number of solution tanks. Each flow guide may be disposed between the tin stripping bath and each of the at least two solution tanks.
In an embodiment according to the invention, each flow guide comprises: the upper flow guide pipes are arranged below the tin stripping tank and are communicated with the tin stripping tank in a fluid manner; and a baffle groove having an inverted triangular cross section and fluidly communicating the plurality of upper flow ducts and the respective solution tanks, and including a liquid discharge port at a lower apex portion of the inverted triangle.
In an embodiment according to the invention, the liquid outlet of the guiding gutter may be arranged distant from the liquid inlet of the respective first circulation pump in the sectional view.
In an embodiment according to the present invention, the second sub-circulation portion may include the same number of second circulation pumps as the number of solution tanks. Each second circulating pump can internally circulate the tin stripping liquid in the corresponding solution tank of the at least two solution tanks.
In an embodiment according to the present invention, the liquid inlet and the liquid outlet of each solution tank communicating with the second circulation pump may be provided on a side surface of at least one of the side surfaces of the solution tank remote from the liquid outlet of the guiding gutter and the liquid inlet communicating with the first circulation pump.
In an embodiment according to the present invention, the at least one auxiliary roller may further include: a roller shaft; and a roller body mounted on the roller shaft and having a plurality of brush wire holes provided on an outer circumferential surface thereof, the brush wires being fixed to the brush wire holes.
In an embodiment according to the present invention, at least one of the transport rollers may include: a roller shaft; a plurality of roller pieces mounted on the roller shaft and spaced apart from each other by a predetermined distance; and at least one weight mounted on the roller shaft, disposed between adjacent roller pieces among the plurality of roller pieces, and having a predetermined weight.
Drawings
These and/or other aspects will become apparent and more readily appreciated from the following description of the exemplary embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a perspective view of a tin stripping apparatus according to an exemplary embodiment of the inventive concept;
fig. 2 is a sectional view of a tin stripping apparatus taken along line I-I' of fig. 1 according to an exemplary embodiment of the inventive concept;
fig. 3 is a schematic diagram illustrating an embodiment of an upper infusion tube or a lower infusion tube, according to an exemplary embodiment of the present inventive concept;
fig. 4 is a sectional view of a tin stripping apparatus taken along lines II-II ', III-III ', and IV-IV ' of fig. 1, respectively, according to an exemplary embodiment of the inventive concept;
FIG. 5 is a schematic view of an embodiment of an auxiliary roller according to an exemplary embodiment of the inventive concept;
fig. 6 is a perspective view of an embodiment of a transport roller according to an exemplary embodiment of the inventive concept; and
fig. 7 is a sectional view of the transport roller taken along line V-V' of fig. 6 according to an exemplary embodiment of the inventive concept.
Detailed Description
The principles of the present invention will be described in further detail below with reference to the accompanying drawings and exemplary embodiments to make the technical solution of the present invention clearer.
Fig. 1 is a perspective view of a tin stripping apparatus according to an exemplary embodiment of the inventive concept. In the drawings, the X-axis, the Y-axis, and the Z-axis are not limited to three axes of a rectangular coordinate system, and may be explained in a broader sense. For example, the X, Y, and Z axes may be perpendicular to each other, or may represent different directions that are not perpendicular to each other.
Referring to fig. 1, a tin stripping apparatus 1000 according to an exemplary embodiment of the inventive concept may include a solution tank 1100 and a tin stripping bath 1200.
As shown in fig. 1, the solution tank 1100 of the tin stripping apparatus 1000 may include two solution tanks (i.e., solution tanks 1100a and 1100 b), and the solution tanks 1100a and 1100b may be disposed adjacent to each other. Solution tanks 1100a and 1100b may be two separate solution tanks. In other words, the solution tanks 1100a and 1100b may be fluidly disconnected from each other (i.e., physically separated from each other). Although it is illustrated in fig. 1 that the tin stripping apparatus 1000 includes two solution tanks, according to an exemplary embodiment of the present invention, it is not limited thereto, for example, the tin stripping apparatus 1000 may include at least two solution tanks (such as three or more solution tanks).
The tin stripping groove portion 1200 may be provided on a part of the top surface of the solution tanks 1100a and 1100 b. In other words, the tin-stripping groove section 1200 may at least partially overlap with the solution tanks 1100a and 1100b in the vertical direction (i.e., the Z-axis direction). In an embodiment according to the present invention, the solution tanks 1100a and 1100b may share one tin stripping bath 1200.
In an embodiment according to the present invention, the tin stripping apparatus 1000 may further include a circulation portion that circulates the tin stripping liquid, which will be described in detail below. The circulation portion may include a first sub-circulation portion and a second sub-circulation portion. The first sub-circulation unit can convey the tin stripping liquid contained in the solution tanks 1100a and 1100b into the tin stripping groove section 1200 and externally circulate the tin stripping liquid together with a flow path for discharging the tin stripping liquid in the tin stripping groove section 1200 into the solution tank 1100a or 1100b, thereby forming a tin stripping liquid extra-circulation path. The second sub-circulation unit may internally circulate the solder stripping solution contained in each of the solution tanks 1100a and 1100b inside the corresponding solution tank, thereby forming an internal circulation path of the solder stripping solution.
In this case, when the tin stripping process is performed, the tin stripping liquid of each of the solution tanks 1100a and 1100b (or more) may be externally circulated between the tin stripping groove section 1200 and the corresponding solution tank for a predetermined time in a predetermined order by the first sub-circulation section. For example, the tin stripping liquid in one of the solution tanks 1100a and 1100b may be first conveyed into the tin stripping tank section 1200 by the first sub-circulation section, and the tin stripping liquid in the tin stripping tank section 1200 may be discharged into the corresponding solution phase through a fluid passage between the tin stripping tank section 1200 and the corresponding solution tank, and the tin stripping liquid may be externally circulated between the tin stripping tank section 1200 and the one solution tank for a predetermined time. When it is necessary to replace the tin-stripping liquid, the used tin-stripping liquid may be discharged from the tin-stripping bath 1200 to the one solution tank while the unused tin-stripping liquid contained in the other solution tank of the solution tanks 1100a and 1100b is conveyed into the tin-stripping bath 1200 by the first sub-circulation section so that the tin-stripping liquid is externally circulated between the tin-stripping bath 1200 and the other solution tank for a predetermined time. As a result, the tin stripping equipment provided by the embodiment of the invention can ensure the continuous tin stripping process, and avoid the reduction of production efficiency caused by replacing the tin stripping liquid.
Further, while the first sub-circulation unit externally circulates the tin stripping liquid, the second sub-circulation unit internally circulates the tin stripping liquid stored in the solution tank 1100a, and internally circulates the tin stripping liquid stored in the solution tank 1100 b. As a result, since the tin stripping solution can be sufficiently circulated by the tin stripping apparatus according to the embodiment of the present invention, the tin stripping solution can be further sufficiently utilized, thereby avoiding waste of the tin stripping solution.
The solution tank 1100, the tin stripping bath 1200, and the circulation unit of the tin stripping apparatus 1000 will be described in detail below with reference to fig. 1 and fig. 2 to 4.
Fig. 2 is a sectional view of a tin stripping apparatus taken along line I-I' of fig. 1 according to an exemplary embodiment of the inventive concept. Fig. 3 is a schematic diagram illustrating an embodiment of an upper infusion tube or a lower infusion tube, according to an exemplary embodiment of the present inventive concept. Fig. 4 is a sectional view of a tin stripping apparatus taken along lines II-II ', III-III ', and IV-IV ' of fig. 1, respectively, according to an exemplary embodiment of the inventive concept.
As shown in fig. 2 and 4, the tin stripping groove portion 1200 may include: a housing 1210; a tin stripping groove 1220 arranged in the shell body 1210; and a conveying part disposed in the tin stripping groove 1220.
The case body 1210 may be an outer shell of the tin-stripping bath 1200 to seal and protect components of the tin-stripping bath 1200 located inside the case body 1210.
The tin stripping bath 1220 may be disposed in the case body 1210. The stripping bath 1220 may define a space for performing a stripping process. Specifically, during the tin stripping process, the tin stripping solution in the solution tank 1100 may be conveyed into the tin stripping tank 1220, and the article containing the tin plating layer may be soaked in the tin stripping solution of the tin stripping tank 1220, so that the tin plating layer is stripped by the tin stripping solution. In the embodiment according to the invention, the tin-plated layer can be removed by using the tin-removing liquid through a chemical stripping method.
In an embodiment according to the present invention, at least one of the sidewalls of the tin stripping groove 1220 may be spaced apart from a corresponding inner sidewall of the inner sidewalls of the case 1210 by a predetermined distance. During the performance of the tin stripping process, the tin stripping liquid in the tin stripping bath 1220 may overflow from the top of the sidewalls of the tin stripping bath 1220, and be discharged to the lower solution tank through the space S defined by the at least one sidewall of the tin stripping bath 1220 and the corresponding inner sidewall of the case 1210 (or through a pipe disposed in the space S defined by the at least one sidewall of the tin stripping bath 1220 and the corresponding inner sidewall of the case 1210). As shown in fig. 2, tin-stripping channel 1220 may have a "u" shape.
As shown in fig. 2 and 4, the transport portion 1240 may be disposed in the tin stripping bath 1220 and may be used to transport an article to be tin stripped (such as a PCB board) from a feed opening of the tin stripping bath 1200 to a discharge opening of the tin stripping bath 1200 via the tin stripping bath 1220 in a first horizontal direction (i.e., an X-axis direction or a length direction of the tin stripping bath 1200) that intersects with a vertical direction. The conveyor 1240 may include an upper conveyor 1240a and a lower conveyor 1240b disposed symmetrically to each other in the vertical direction. Each of the upper and lower conveyors 1240a and 1240b may include a conveying roller 1241. The conveying rollers 1241 may extend in a second horizontal direction (i.e., the Y-axis direction or the width direction of the solder stripping groove portion 1200) that intersects the vertical direction and the first horizontal direction, and may be arranged in the first horizontal direction. The conveying roller 1241 can provide a supporting force for the object to be detinned and a driving force for the movement of the object to be detinned during the detinning process. In addition, the time consumed by the tin-stripping article passing through the tin-stripping tank 1220 can be adjusted by controlling the rotation speed of the conveying roller 1241, and further the time for tin-stripping treatment of the tin-stripping article can be adjusted. In this case, different traveling speeds of the articles to be detinned may be provided by the conveying rollers 1241 according to the tin layer thickness of the articles to be detinned, and the like. The transport part according to an embodiment of the inventive concept will be described in detail below with reference to fig. 5 to 7, and thus, will not be described again herein.
As shown in fig. 1 and fig. 2 and 4, the first sub-circulation part may include: a first circulation pump 1310 provided on a corner of the top surface of the corresponding one of the solution tanks 1100 that does not overlap with the tin-stripping groove section 1200; a main infusion tube 1320 extending in parallel to the tin-stripping tank 1200 in the first horizontal direction and provided above the solution tank 1100, the first circulation pump 1310 being connected to the main infusion tube 1320; and a plurality of sets of branch infusion tubes 1330 connected to the main infusion tube 1320 and extending into the tin-stripping tank 1200.
Referring to fig. 1, the first sub-circulation part may include two first circulation pumps 1310. One first circulation pump 1310 may be disposed on a corner of the top surface of the solution tank 1100a that does not overlap the tin stripping bath 1200, and the other first circulation pump 1310 may be disposed on a corner of the top surface of the solution tank 1100b that does not overlap the tin stripping bath 1200. As shown in fig. 1, the two first circulation pumps 1310 may be disposed on adjacent corners of the top surfaces of the two solution tanks 1100a and 1100b that do not overlap with the tin-stripping bath portion. However, the exemplary embodiment according to the present invention is not limited thereto, and for example, when the solution tank 1100 is three or more, the first sub-circulation part may include three or more first circulation pumps 1310. The number of the first circulation pumps 1310 may be the same as the number of the solution tanks 1100.
In an embodiment in accordance with the invention, both first circulation pumps 1310 may be connected to the main infusion line 1320. In other words, two first circulation pumps 1310 may share a main infusion line 1320. While the first sub-circulation part may include three or more first circulation pumps 1310, the three or more first circulation pumps 1310 may also share one main infusion tube 1320.
During the tin stripping process, the tin stripping solution in the corresponding solution tank 1100 is conveyed into the tin stripping tank 1200 through the main liquid conveying pipe 1320 by one first circulating pump 1310 of the at least two first circulating pumps 1310. When the tin stripping liquid needs to be replaced, the tin stripping liquid in the tin stripping tank 1200 is discharged into the corresponding solution tank 1100, and meanwhile, the unused tin stripping liquid in another solution tank 1100 can be conveyed into the tin stripping tank 1200 through the main infusion pipe 1320 by another first circulating pump 1310 of the at least two first circulating pumps 1310.
As shown in fig. 1 and 2, each set of branch infusion tubes 1330 may include: a vertical infusion tube 1331 extending vertically from the main infusion tube 1320; an upper infusion tube 1332 extending from a top end of the vertical infusion tube 1331 in a second horizontal direction into an upper portion of the tin-stripping groove 1200; and a lower infusion tube 1333 extending from the vertical infusion tube 1331 in the second horizontal direction into a lower portion of the tin-stripping tank 1200. During the tin stripping process, tin stripping solution in the main infusion tube 1320 can be delivered to the upper infusion tube 1332 and the lower infusion tube 1333 via the vertical infusion tube 1331, and finally delivered to the tin stripping tank 1220 via the openings provided on the upper infusion tube 1332 and the lower infusion tube 1333. As shown in fig. 4, an upper infusion tube 1332 and a lower infusion tube 1333 may be provided on both sides of the transporter 1240 in the vertical direction.
As shown in fig. 2, the upper infusion tube 1332 may include a first sub-upper infusion tube 1332-1 and a second sub-upper infusion tube 1332-2. The first sub upper infusion tube 1332-1 may extend from a tip of the vertical infusion tube 1331 into an upper portion of the tin-stripping groove 1200 and include an end portion located at a middle position of the tin-stripping groove 1200 in the second horizontal direction. The second sub-upper infusion tube 1332-2 may be closer to the lower infusion tube 1333 than the first sub-upper infusion tube 1332-1 and connected to the end of the first sub-upper infusion tube 1332-1. In this case, the lower fluid conduit 1333 and the second sub-upper fluid conduit 1332-2 may include openings that deliver the de-tinning liquid into the de-tinning tank 1220. As a result, as the distance between the lower infusion tube 1333 and the second sub-upper infusion tube 1332-2 from the item to be solder-stripped decreases, the solder stripping rate can be increased, and the solder stripping solution can be utilized more fully. In addition, as shown in fig. 2, a fixing device F may be further provided between the first sub upper infusion tube 1332-1 and the second sub upper infusion tube 1332-2 to fix the second sub upper infusion tube 1332-2.
However, the structures of the upper infusion tube 1332 (or the second sub-upper infusion tube 1332-2) and the lower infusion tube 1333 according to an embodiment of the inventive concept are not limited to the above-described embodiment. For example, as shown in fig. 3, in some embodiments, at least one of the upper infusion tube 1332 (or the second sub-upper infusion tube 1332-2) and the lower infusion tube 1333 can include a main tube M and a protrusion P protruding from the main tube M toward the items to be tinned. The projection P may have a plurality of openings on its surface facing the item to be tin-stripped. By the structure of the upper infusion tube 1332 (or the second sub-upper infusion tube 1332-2) and the lower infusion tube 1333, the tin-stripping solution can be injected more uniformly, and can be further fully utilized.
In addition, as shown in fig. 1, the first sub-circulation part may further include a filter 1340. The filters 1340 may be disposed adjacent to and in fluid communication with the respective first circulation pumps 1310. The tin stripping solution can be delivered to the tin stripping tank 1220 after passing through the filter 1340. The filter 1340 can be used to filter impurities in the tin stripping solution, so as to prevent the impurities from entering the tin stripping tank 1220 together with the tin stripping solution and causing damage or pollution to the articles to be stripped. As shown in fig. 1, the number of filters 1340 may be the same as the number of first circulation pumps 1310.
By the above-described first sub-cycle portion, the solder stripping liquid can be sufficiently utilized.
Further, in an embodiment according to the inventive concept, the second sub-circulation part may include a second circulation pump (not shown) disposed outside the solution tank 1100. The number of the second circulation pumps may be the same as the number of the solution tanks. The second circulation pump can be used for internally circulating the tin stripping liquid contained in each solution tank inside the corresponding solution tank, so as to form an internal circulation path of the tin stripping liquid. In an embodiment according to the present invention, the second sub-circulation part may include two second circulation pumps, one of the second circulation pumps may internally circulate the solder stripper contained in the solution tank 1100a inside the solution tank 1100a, and the other of the second circulation pumps may internally circulate the solder stripper contained in the solution tank 1100b inside the solution tank 1100 b. As a result, the tin stripping liquid can be further fully utilized through the second sub-circulation part, and the waste of the tin stripping liquid is avoided. In this case, the second circulation pumps may be respectively disposed at sides of the respective solution tanks distant from the corresponding first circulation pump 1310. In other words, the liquid inlet and the liquid outlet of each solution tank 1100 communicating with the second circulation pump may be disposed on a side surface of the solution tank 1100 away from the liquid inlet communicating with the first circulation pump 1310, thereby enabling the solder stripping liquid inside the solution tank 1100 to be circulated more sufficiently.
Further, as shown in fig. 2 and 4, the fluid passage for discharging the tin-stripping solution in the tin-stripping bath section 1200 into the respective solution tanks 1100 may include the same number of flow guide sections 1400 as the number of solution tanks 1100. Each flow guide 1400 may be disposed between the tin stripping bath 1200 and each solution tank 1100, respectively, and may fluidly communicate the tin stripping bath 1200 with the corresponding solution tank 1100, respectively.
Each flow guide 1400 may include: a plurality of upper flow guide tubes 1410 disposed below the tin stripping tank section 1200 and in fluid communication with the tin stripping tank section 1200; and a flow guide channel 1420 having an inverted triangular cross-section and being in fluid communication with the plurality of upper flow guide tubes 1410 and the corresponding solution tank 1100, and including a liquid discharge port at a lower vertex angle portion of the inverted triangle. However, embodiments according to the present invention are not limited thereto, and for example, the flow guide tube 1410 may further extend into the space S as described above.
As shown in fig. 2 and 4, the flow conduit 1410 may extend in a second horizontal direction and be arranged in a first horizontal direction. During the tin stripping process, the tin stripping liquid in the tin stripping tank 1220 can overflow from the top of the tin stripping tank 1220 and flow into the flow guide tube 1410. Under the condition, the contact between the tin stripping solution and the air can be further reduced, and further tin ions in the tin stripping solution are prevented from being further oxidized by the air. Then, the solder stripping liquid flowing into the flow guide tube 1410 may flow into the flow guide channel 1420 through the openings provided in the flow guide tube 1410. Finally, the solder stripping solution is discharged into the corresponding solution tank 1100 through a liquid discharge port on the diversion trench 1420.
In the cross-sectional view, the drain outlet of the diversion trench 1420 can be set to be far away from the liquid inlet of the corresponding first circulating pump, so as to avoid the decrease of the utilization rate of the solder stripping liquid caused by the too small distance between the drain outlet and the liquid inlet of the first circulating pump. Further, in the second sub-circulation portion, a liquid inlet and a liquid outlet of each solution tank 1100 communicating with the second circulation pump may be further provided on a side surface of the solution tank 1100 away from the liquid outlet of the baffle 1420. Therefore, the solder stripping liquid in the solution tank 1100 can be circulated more sufficiently.
Next, the transportation part 1240 according to an embodiment of the inventive concept will be described in detail with reference to fig. 4 and 5 to 7.
Fig. 5 is a schematic view of an embodiment of an auxiliary roller according to an exemplary embodiment of the inventive concept.
Fig. 6 is a perspective view of an embodiment of a transport roller according to an exemplary embodiment of the inventive concept. Fig. 7 is a sectional view of the transport roller taken along line V-V' of fig. 6 according to an exemplary embodiment of the inventive concept.
As shown in fig. 4, the conveyor 1240 may include an upper conveyor 1240a and a lower conveyor 1240b. The item to be stripped of tin may be moved between the upper conveyor 1240a and the lower conveyor 1240b.
In an embodiment according to the inventive concept, each of the upper and lower conveyors 1240a and 1240b may include a conveying roller 1241. The conveying rollers 1241 of the upper conveying part 1240a and the conveying rollers 1241 of the lower conveying part 1240b may be disposed opposite to each other.
In an embodiment according to the inventive concept, at least one of the upper and lower conveyors 1240a and 1240b may further include at least one auxiliary roller 1242 in addition to the conveyor roller 1241. Specifically, when the auxiliary rollers 1242 are included only in the upper conveyors 1240a, the auxiliary rollers 1242 may be disposed between the conveying rollers 1241 of the upper conveyors 1240a adjacent to each other, and disposed opposite to the corresponding conveying rollers 1241 of the lower conveyors 1240b. When the auxiliary rollers 1242 are included only in the lower conveyor 1240b, the auxiliary rollers 1242 may be disposed between the conveying rollers 1241 of the lower conveyor 1240b adjacent to each other, and disposed opposite to the corresponding conveying rollers 1241 of the upper conveyor 1240 a. When the auxiliary rollers 1242 are included in both the upper and lower conveyors 1240a and 1240b, the auxiliary rollers 1242 may be disposed opposite to each other in the vertical direction or may be shifted (or staggered) from each other in the vertical direction.
In the embodiment according to the present invention, the number of the auxiliary rollers 1242 is not limited, and the number thereof may be set according to actual needs. When the auxiliary rollers 1242 in the upper or lower conveyors 1240a or 1240b are plural, the auxiliary rollers 1242 may be alternately disposed with the conveying rollers 1241 in the corresponding sub conveyor (e.g., the upper or lower conveyors 1240a or 1240 b), and may be disposed opposite to the corresponding conveying rollers 1241 (or the auxiliary rollers 1242) of the other sub conveyor (e.g., the upper or lower conveyors 1240a or 1240 b). In an embodiment according to the inventive concept, although an example in which the auxiliary roller 1242 may be disposed between each pair of adjacent conveying rollers 1241 of the upper conveyor 1240a is illustrated in fig. 4, the auxiliary roller 1242 according to an embodiment of the invention may be disposed between a portion of the adjacent conveying rollers 1241 of the upper conveyor 1240 a.
In an embodiment according to the present invention, the auxiliary roller 1242 may include brush filaments 1242-4 provided on an outer circumferential surface thereof. Specifically, as shown in fig. 5, the auxiliary roller 1242 may include a roller shaft 1242-1, a roller body 1242-2 mounted on the roller shaft 1242-1, a plurality of brush wire holes 1242-3 provided on an outer circumferential surface of the roller body 1242-2, and brush wires 1242-4 fixed to the brush wire holes 1242-3. When the auxiliary roller 1242 provides a driving force for the movement of an object (such as a PCB) to be detinned during the execution of the detinning process, the brush wires 1242-4 may also be used to provide a mechanical force to the tin plating layer soaked by the detinning solution on the object (such as a PCB), thereby improving the detinning efficiency. In addition, the auxiliary roller 1242 including the brush wires 1242-4 is convenient to install, and the rotation of the auxiliary roller 1242 including a plurality of brush wires 1242-4 can stir the solder stripping solution to a certain extent, so that the utilization rate of the solder stripping solution can be further improved.
In an embodiment according to the present invention, since the brush filaments 1242-4 may be in direct contact with the PCB board, the brush filaments 1242-4 may be made of a material having flexibility (such as carbon fiber filaments, carbon fiber cloth, PP, nylon, etc.), thereby preventing the brush filaments 1242-4 from damaging the PCB board.
In addition, in an embodiment according to the inventive concept, the conveying roller 1241 may be a thin discharge roller. Specifically, the transport rollers 1241 may include roller shafts 1241-1 and roller blades 1241-2 mounted on the roller shafts 1241-1.
However, embodiments according to the inventive concept are not limited thereto. For example, referring to fig. 6 and 7, at least a portion of the transport rollers 1241 may further include at least one weight 1241-3 mounted on the roller shaft 1241-1.
As shown in fig. 6 and 7, the roller shaft 1241-1 may pass through the roller blade 1241-2 and pass through the weight 1241-3 in a long axis direction of the weight 1241-3. Specifically, the roller piece 1241-2 may have a central through hole, and the weight part 1241-3 may have a through hole extending in the direction of the long axis of the weight part 1241-3. In this case, the roller shaft 1241-1 may be passed through the center through-hole of the roller piece 1241-2 and the through-hole of the weight part 1241-3 extending in the long axis direction of the weight part 1241-3, respectively. In an embodiment according to the inventive concept, the roller shaft 110 may include a carbon fiber shaft.
The roller piece 1241-2 may be plural, and the plurality of roller pieces 120 may be disposed to be spaced apart from each other by a predetermined distance. The weight part 1241-3 may be disposed between a pair of roller blades 1241-2 adjacent to each other and have a predetermined weight. Although it is illustrated in fig. 6 that the conveying roller 1241 may include three weight portions 1241-3, embodiments according to the present invention are not limited thereto, and for example, the conveying roller 1241 may include at least one weight portion 1241-3. For example, the transport roller 1241 may include one weight 1241-3 provided at the center of the roller shaft 1241-1. When the weight part 1241-3 is plural, the plural weight parts 1241-3 may be provided spaced apart from each other. As shown in fig. 6, the weight portions 1241-3 may be disposed symmetrically to each other about the center in the length direction of the roller shaft 1241-1.
In an embodiment according to the present invention, the distance of the outer circumferential surface of the weight part 1241-3 from the outer circumferential surface of the roller shaft 1241-1 may be less than or equal to the distance of the outer circumferential surface of the roller piece 1241-2 from the outer circumferential surface of the roller shaft 1241-1. In other words, the outer circumferential surfaces of the weight portions 1241-3 may or may not be in contact with the article being transported. In addition, the length of the weight part 1241-3 may be less than or equal to the distance between the roller pieces 1241-2 adjacent to each other among the plurality of roller pieces 1241-2. In this case, the weight portions 1241-3 may be spaced apart from the roller pieces 1241-2 at both sides by the same distance as each other. Although the weight parts 1241 to 3 illustrated in fig. 6 have a circular tube shape, embodiments according to the present invention are not limited thereto, and the weight parts 1241 to 3 may have an olive shape or a dumbbell shape, for example. The weight portions 1241-3 having a circular tube shape will be described below as an example.
As shown in fig. 7, the weight portions 1241-3 may include the weight body a and a protective case conformally covering the weight body a. The protective case may include: a first wall portion b surrounding a through hole through which the roller shaft 1241-1 of the weight portion 1241-3 passes; a second wall part c surrounding the first wall part b and spaced apart from the first wall part b by a predetermined distance; a third wall part d connecting a first end of the first wall part b and a first end of the second wall part c; and a cover plate e connecting the second end of the first wall portion b and the second end of the second wall portion c and sealing a space defined by the first wall portion b, the second wall portion c, and the third wall portion d. The weight body a may have a circular tube shape and may be inserted into the space.
In the embodiment according to the present invention, the weight body a may have a predetermined weight and may be formed of a metal material. The protective case may be formed of a corrosion-resistant material to seal and protect the weight body a. Specifically, the weight body a may be formed of copper or stainless steel, and the protective case may be formed of PVC or PP. However, embodiments according to the present invention are not limited to the above materials.
In the embodiment according to the present invention, by the above-described structure of the conveying roller 1241, it is possible to avoid an influence of a solution used during the tin stripping process, a process temperature, and the like on the conveying roller. In addition, when the conveying roller is soaked in the corresponding solution, the influence of buoyancy on article conveying can be avoided. Therefore, it is possible to stably support and transport the article during the execution of the corresponding process.
According to the embodiment of the invention, the tin stripping device can achieve at least one of the following effects: reducing tin to air contact during tin stripping process, thereby preventing Sn 2+ Is oxidized into Sn by oxygen in the air 4+ (ii) a The tin stripping liquid is fully circulated, and the utilization rate of the tin stripping liquid is improved; the production efficiency is improved; by using the auxiliary roller, the tin stripping efficiency and the utilization rate of the tin stripping liquid can be improved; and avoiding the influence of the solution used during the tin stripping process, the process temperature and the like on the conveying roller.
Although the tin stripping apparatus according to the exemplary embodiments of the inventive concept is described above with reference to the accompanying drawings, the invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the inventive concept.
Claims (13)
1. A tin stripping apparatus, comprising:
at least two solution tanks (1100) in fluid non-communication with each other;
a tin stripping bath (1200) provided on a part of the top surface of the at least two solution tanks (1100) in the vertical direction and shared by the at least two solution tanks (1100);
a circulation part including a first sub-circulation part that conveys the tin stripping liquid contained in the solution tanks (1100) into the tin stripping bath (1200) and externally circulates the tin stripping liquid together with a fluid passage for discharging the tin stripping liquid in the tin stripping bath (1200) into the solution tanks (1100), and a second sub-circulation part that internally circulates the tin stripping liquid contained in each solution tank (1100) in the corresponding solution tank (1100); and
a flow guide part (1400) respectively arranged between the tin stripping tank (1220) and each solution tank (1100) of the at least two solution tanks (1100),
wherein, during the tin stripping process, the tin stripping solution of each of the at least two solution tanks (1100) is externally circulated between the tin stripping tank section (1200) and the corresponding solution tank for a predetermined time by a first sub-circulation section in a predetermined order,
wherein the tin-stripping groove (1200) comprises: a housing (1210); a tin stripping tank (1220) arranged in the shell (1210); and a conveying part (1240) provided in the tin stripping tank (1220), the conveying part (1240) including an upper conveying part (1240 a) and a lower conveying part (1240 b) each having a conveying roller (1241),
wherein at least one of the upper and lower conveyers (1240 a, 1240 b) further comprises at least one auxiliary roller (1242), the at least one auxiliary roller (1242) being disposed between the mutually adjacent conveying rollers (1241) of the upper conveyer (1240 a) and/or between the mutually adjacent conveying rollers (1241) of the lower conveyer (1240 b), the at least one auxiliary roller (1242) comprising brush filaments (1242-4) disposed on an outer circumferential surface thereof,
wherein each flow guide (1400) comprises: a plurality of upper flow guide pipes (1410) arranged below the tin removing tank (1220) and communicated with the tin removing tank (1220) in a fluid mode; and a baffle channel (1420) having an inverted triangular cross-section and fluidly communicating the plurality of upper draft tubes (1410) with the respective solution tanks (1100), and including a drain at a lower apex of the inverted triangle.
2. The tin stripping apparatus as claimed in claim 1, the first sub-cycle comprising:
first circulation pumps (1310) having the same number as the number of the solution tanks (1100), each first circulation pump (1310) being disposed on a corner of the top surface of the corresponding solution tank (1100) of the at least two solution tanks (1100) that does not overlap with the tin-stripping bath section (1200);
a main infusion tube (1320) extending in parallel to the tin-stripping tank section (1200) in a first horizontal direction intersecting the vertical direction and disposed above the at least two solution tanks (1100), the first circulation pump (1310) being connected to the main infusion tube (1320); and
a plurality of sets of branch infusion tubes (1330) connected to the main infusion tube (1320) and extending into the tin-stripping tank (1200).
3. The tin stripping apparatus as set forth in claim 2, wherein each set of branch infusion tubes (1330) includes:
a vertical infusion tube (1331) extending in a vertical direction from the main infusion tube (1320);
an upper infusion tube (1332) extending from the top end of the vertical infusion tube (1331) into the upper part of the tin-stripping groove part (1200) along a second horizontal direction intersecting the first horizontal direction and the vertical direction; and
and a lower infusion tube (1333) extending from the vertical infusion tube (1331) to the lower part of the tin-stripping groove part (1200) along the second horizontal direction.
4. The tin stripping apparatus as set forth in claim 3, wherein the upper infusion tube (1332) includes:
a first sub-upper infusion tube (1332-1) extending from a top end of the vertical infusion tube (1331) into an upper portion of the tinning bath (1200) and including an end portion located at a middle position of the tinning bath (1200) in a second horizontal direction; and
the second sub-upper infusion tube (1332-2) is closer to the lower infusion tube (1333) than the first sub-upper infusion tube (1332-1) and is connected to the end of the first sub-upper infusion tube (1332-1).
5. The tin stripping apparatus as set forth in claim 4, wherein the lower infusion tube (1333) and the second sub-upper infusion tube (1332-2) include openings to deliver the tin stripping solution into the tin stripping tank (1200).
6. The tin stripping apparatus as recited in claim 4, wherein at least one of the lower infusion tube (1333) and the second sub-upper infusion tube (1332-2) includes a main tube and a protrusion protruding from the main tube, and the protrusion is provided with a plurality of openings.
7. The tin stripping apparatus according to claim 2, wherein when the tin stripping apparatus includes two solution tanks (1100), the first sub-circulation portion includes two first circulation pumps (1310),
wherein two first circulation pumps (1310) are provided on adjacent corners of the top surfaces of the two solution tanks (1100) that do not overlap with the tin-stripping bath section (1200).
8. The tin stripping apparatus according to claim 2, wherein the first sub-circulation portion further includes the same number of filters (1340) as the number of solution tanks (1100),
wherein each filter (1340) and the respective first circulation pump (1310) are disposed adjacent to each other and in fluid communication with each other.
9. The tin stripping apparatus according to claim 1, wherein, in a cross-sectional view, the liquid outlet of the flow guide channel (1420) is disposed away from the liquid inlet of the corresponding first circulation pump (1310).
10. The tin stripping apparatus according to claim 1, wherein the second sub-circulation portion includes the same number of second circulation pumps as the number of solution tanks,
wherein each second circulation pump internally circulates the tin stripping liquid in a corresponding solution tank (1100) of the at least two solution tanks (1100).
11. The tin stripping apparatus as claimed in claim 10, wherein the liquid inlet and the liquid outlet of each solution tank (1100) communicating with the second circulation pump are provided on a side surface of at least one of the side surfaces of the solution tank (1100) remote from the liquid outlet of the guiding gutter (1420) and the liquid inlet communicating with the first circulation pump (1310).
12. The tin stripping apparatus as claimed in claim 1, wherein the at least one auxiliary roller (1242) further comprises: a roller shaft (1242-1); and a roller body (1242-2) mounted on the roller shaft (1242-1) and having a plurality of brush wire holes (1242-3) provided on an outer circumferential surface thereof, the brush wires (1242-4) being fixed to the brush wire holes (1242-3).
13. The tin stripping apparatus as claimed in claim 1, wherein at least one of the transport rollers (1241) comprises: a roller shaft (1241-1); a plurality of roller blades (1241-2) mounted on the roller shaft (1241-1), and the plurality of roller blades (1241-2) are spaced apart from each other by a predetermined distance; and at least one weight portion (1241-3) mounted on the roller shaft (1241-1), provided between roller pieces (1241-2) adjacent to each other among the plurality of roller pieces (1241-2), and having a predetermined weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010364826.1A CN111472001B (en) | 2020-04-30 | 2020-04-30 | Tin stripping equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010364826.1A CN111472001B (en) | 2020-04-30 | 2020-04-30 | Tin stripping equipment |
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| Publication Number | Publication Date |
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| CN111472001A CN111472001A (en) | 2020-07-31 |
| CN111472001B true CN111472001B (en) | 2022-10-21 |
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|---|---|---|---|---|
| GB2152398A (en) * | 1984-01-13 | 1985-08-07 | Chemcut Corp | Apparatus for chemically removing solid matter from articles |
| US5378307A (en) * | 1993-04-28 | 1995-01-03 | International Business Machines Corporation | Fluid treatment apparatus |
| US20030150381A1 (en) * | 2000-08-12 | 2003-08-14 | Pill E.K | Apparatus for the spray treatment of printed circuit boards |
| CN110035620A (en) * | 2019-04-29 | 2019-07-19 | 深圳市科路迪机械设备有限公司 | SES production line |
| CN110725001A (en) * | 2019-10-30 | 2020-01-24 | 昆山金易得环保科技有限公司 | A move back tin equipment that is used for moving back tin equipment's conductive brush and contains it |
| CN209994653U (en) * | 2019-01-21 | 2020-01-24 | 龙岩金时裕电子有限公司 | Film stripping, etching and tin stripping machine for multilayer high-precision circuit board |
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2020
- 2020-04-30 CN CN202010364826.1A patent/CN111472001B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2152398A (en) * | 1984-01-13 | 1985-08-07 | Chemcut Corp | Apparatus for chemically removing solid matter from articles |
| US5378307A (en) * | 1993-04-28 | 1995-01-03 | International Business Machines Corporation | Fluid treatment apparatus |
| US20030150381A1 (en) * | 2000-08-12 | 2003-08-14 | Pill E.K | Apparatus for the spray treatment of printed circuit boards |
| CN209994653U (en) * | 2019-01-21 | 2020-01-24 | 龙岩金时裕电子有限公司 | Film stripping, etching and tin stripping machine for multilayer high-precision circuit board |
| CN110035620A (en) * | 2019-04-29 | 2019-07-19 | 深圳市科路迪机械设备有限公司 | SES production line |
| CN110725001A (en) * | 2019-10-30 | 2020-01-24 | 昆山金易得环保科技有限公司 | A move back tin equipment that is used for moving back tin equipment's conductive brush and contains it |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111472001A (en) | 2020-07-31 |
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