QFN tin pot tinning tool

Abstract

The utility model belongs to the technical field of tin coating equipment, and particularly relates to a QFN tin pot tin coating tool which comprises a tool box, and a rapid tin coating mechanism is fixedly installed in an inner cavity of the tool box. The rapid tin coating mechanism comprises a fixing frame, the bottom of the fixing frame is fixedly connected with the bottom of an inner cavity of the tool box, a two-way motor is fixedly installed on the inner surface of the fixing frame, a rotating shaft is fixedly installed at the output end of the two-way motor through a speed reducer, and a worm is fixedly installed on the outer surface of the rotating shaft. According to the QFN tin pot tinning tool, the two-way motor drives the worm to rotate through the rotating shaft, the worm drives the threaded rod to rotate through the worm gear, the threaded rod moves downwards through the lifting frame, the lifting frame drives the tinning frame to stretch into the tin pot, QFN welding is immersed in a tin metal solution in the tin pot, and the tin attaching step is carried out; in the tin coating step, tin can be attached to nine QFN welding feet at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to tin lining equipment technical field especially relates to QFN tin pot tin lining frock. BACKGROUND

[0002] QFN is a kind of pinless package, square or rectangle, package bottom central position has a large area bare pad for heat conduction, around the package periphery of large pad there is electrically connected conductive pad, and currently for plug-in device tin lining mainly has manual solder tin lining and tin pot tin lining, tin lining is a kind of metal surface treatment technology, by heat treatment the molten tin is coated on metal surface, then after cooling solidification forms protective layer.

[0003] In order to solve large-scale QFN tin lining, usually tin pot is used for tin lining, which will exist the following problems in actual operation:

[0004] 1, since QFN side pin soldering end is bare copper, bare copper is easy to react chemically in air, form copper oxide, this oxidation will lead to solder tin difficult to adhere on the pad of QFN side, in order to avoid the influence of oxidation layer on the adhesion of solder tin, usually QFN soldering leg is contacted with tin solution for a long time, so that tin solution is on the copper oxide, further increases the tinning difficulty, and also increases the contact time of QFN soldering leg with air, further increases the thickness of oxidation layer, thereby increasing the tinning difficulty.

[0005] 2, since QFN side pin is torn off protective film at soldering leg before tin lining, then concentrate on QFN soldering leg tin lining, since manual tin lining process is time-consuming, usually a QFN soldering leg is torn film to tin lining about four hours, therefore QFN soldering leg exists a layer of oxidation layer with different thickness, leads to different tin lining effect of each QFN soldering leg, greatly increases the tinning difficulty. UTILITY MODEL CONTENTS

[0006] In order to overcome the defects of the prior art pointed out above, the present utility model person has made deep research, and after paying a lot of creative labor, the present utility model is completed.

[0007] Specifically, the technical problem to be solved by the utility model is to provide QFN tin pot tin lining frock, to solve the cutting surface of the current QFN easy to oxidize, lead to QFN side affect the effect of solder tin, increase the tinning difficulty, and manual tin lining process can only single QFN tin lining, tin lining speed is slow, since the time required for QFN soldering leg film tearing to tin lining step is long, lead to QFN side bare copper soldering end time is long, more easy to be oxidized, lead to further increase the tinning difficulty.

[0008] To solve the above technical problems, the utility model provides the following technical scheme:

[0009] The utility model provides a QFN tin pot tinning tool, including tool box, the inner chamber of tool box is fixedly installed with quick tinning mechanism,

[0010] The quick tinning mechanism includes a fixed frame, the bottom of the fixed frame is fixedly connected with the bottom of the inner chamber of the tool box, a bidirectional motor is fixedly installed on the inner surface of the fixed frame, a rotating shaft is fixedly installed on the output end of the bidirectional motor through a speed reducer, and a worm is fixedly installed on the outer surface of the rotating shaft.

[0011] As an improved technical solution, the quick tinning mechanism further includes a threaded rod, a worm wheel is fixedly installed on the outer surface of the threaded rod, and a lifting frame is threadedly installed on the outer surface of the threaded rod.

[0012] As an improved technical solution, the bottom end of the threaded rod is rotatably connected with the bottom of the inner chamber of the tool box, and the outer surface of the worm wheel is engaged with the outer surface of the worm.

[0013] As an improved technical solution, the bottom of the lifting frame is fixedly installed with an upper tinning mechanism, the upper tinning mechanism includes an upper tinning frame, a placing groove is formed in the top of the upper tinning frame, an upper tinning groove is formed in the top of the placing groove, and a solution observation groove is arranged on the top of the upper tinning frame and away from the placing groove.

[0014] As an improved technical solution, the inner surface of the upper tinning frame is threadedly connected with the outer surface of the lifting frame.

[0015] As an improved technical solution, the bottom of the inner chamber of the tool box is fixedly installed with a placing frame, and the top of the placing frame is fixedly installed with a tin pot.

[0016] After the above technical solution is adopted, the utility model has the following beneficial effects:

[0017] 1. The utility model discloses a design for reducing the tin adhesion difficulty at the QFN soldering leg, the bidirectional motor, the rotating shaft, the worm and the worm wheel are used in cooperation, the worm wheel, the threaded rod, the lifting frame and the upper tinning frame are used in cooperation, and the upper tinning frame and the upper tinning groove are used in cooperation, so that the QFN soldering leg is quickly and evenly tinned, the problem of great difficulty in manual tinning is solved, and the uniformity of tinning at each QFN soldering leg is ensured.

[0018] 2. The utility model discloses a design of increasing the time of tearing film to tin of QFN, through the cooperation of tinning frame, placing groove and tinning groove, thereby reaching the effect that the original manual tinning can only tinning one QFN each time, becomes tinning nine QFN pin feet at the same time, reduces the time of tearing film to tinning of QFN pin feet, greatly reduces the oxidation effect of copper pin feet of QFN, reduces the difficulty of tinning of the oxidation layer of pin feet. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be to the embodiment description needed to use the drawing briefly introduced, obviously, the following description in the drawing is only some embodiments of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings. Among them:

[0020] Figure 1 It is the whole three-dimensional structure schematic diagram of QFN tin pot of the utility model.

[0021] Figure 2 It is the three-dimensional sectional structure schematic diagram of tool box of QFN tin pot of the utility model.

[0022] Figure 3 It is the three-dimensional structure schematic diagram of quick tin mechanism and tinning mechanism of QFN tin pot of the utility model.

[0023] Figure 4 It is the three-dimensional structure schematic diagram of tinning frame of QFN tin pot of the utility model.

[0024] BRIEF DESCRIPTION OF DRAWINGS:

[0025] 1, tool box;2, quick tin mechanism;21, fixed frame;22, bidirectional motor;23, rotating shaft;24, worm;25, threaded rod;26, worm wheel;27, lifting frame;3, tinning mechanism;31, tinning frame;32, placing groove;33, tinning groove;34, solution observation groove;4, placing frame;5, tin pot. DETAILED DESCRIPTION

[0026] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled person in the art without creative labor belong to the scope of protection of the utility model.

[0027] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications will also change accordingly.

[0028] Meanwhile, "and / or" or "and / or" appearing in the full text means that it includes three schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B schemes are satisfied at the same time.

[0029] In addition, in the present application, the description such as "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the present application.

[0030] As shown in Figure 1 , Figure 2 and Figure 3 , the present embodiment provides a QFN tin pot tinning tool, which comprises a tool box 1, and a quick tinning mechanism 2 fixedly installed in the inner cavity of the tool box 1.

[0031] The quick tinning mechanism 2 comprises a fixing frame 21, the bottom of the fixing frame 21 is fixedly connected with the bottom of the inner cavity of the tool box 1, a bidirectional motor 22 is fixedly installed on the inner surface of the fixing frame 21, a rotating shaft 23 is fixedly installed on the output end of the bidirectional motor 22 through a speed reducer, and a worm 24 is fixedly installed on the outer surface of the rotating shaft 23.

[0032] The rotating shaft 23 and the worm 24 are two, and the thread on the worm 24 presents positive and negative threads.

[0033] The bidirectional motor 22 is electrically connected with an external power supply, and the bidirectional motor 22 is controlled by an external PLC programming program.

[0034] As shown in Figure 1 , Figure 2 and Figure 3 , the quick tinning mechanism 2 further comprises a threaded rod 25, a worm wheel 26 is fixedly installed on the outer surface of the threaded rod 25, and a lifting frame 27 is threadedly installed on the outer surface of the threaded rod 25.

[0035] The worm gear 26 and the threaded rod 25 have two, two thread direction opposite worm 24 drive two worm gear 26 rotation, make the threaded rod 25 in the worm gear 26 rotation direction opposite, make two threaded rod 25 drive the lifting frame 27 to one direction movement.

[0036] As Figure 1 , Figure 2 and Figure 3 Commonly shown, the bottom end of the threaded rod 25 and the bottom of the tool box 1 cavity rotation connection, the outer surface of the worm gear 26 and the outer surface of the worm 24 meshing.

[0037] As Figure 1 , Figure 3 and Figure 4 Commonly shown, the bottom of the lifting frame 27 is fixedly installed with the tin mechanism 3, the tin mechanism 3 includes the tin frame 31, the top of the tin frame 31 is provided with the placing groove 32, the top of the placing groove 32 is provided with the tin slot 33, and the top of the tin frame 31 and away from the placing groove 32 is provided with the solution observation groove 34.

[0038] The tin slot 33 has nine, and each tin slot 33 has two placing grooves 32, the two corners of the QFN are placed in the placing groove 32, so that the welding part of the QFN can be immersed in the tin slot 33, and the solution observation groove 34 can be observed in real time the depth of the tin frame 31 immersed in the tin metal solution in the tin pot 5.

[0039] As Figure 1 , Figure 3 and Figure 4 Commonly shown, the inner surface of the tin frame 31 and the outer surface of the lifting frame 27 are threadedly connected.

[0040] As Figure 2 Shown, the bottom of the tool box 1 cavity is fixedly installed with the placing frame 4, and the top of the placing frame 4 is fixedly installed with the tin pot 5.

[0041] The tin pot 5 is electrically connected with the external power supply, and the tin pot is controlled by the external PLC programming program.

[0042] In use, the user first places the tin pot 5 on the placing rack 4 in the tool box 1, then places tin metal in the tin pot 5, and starts the tin pot 5 to melt the tin metal, then the user tears off the protective film of the soldering part of the QFN, and places the QFN in the processing box, then the user takes out nine QFNs from the processing box, and places them in the placing grooves 32 of the upper tinning rack 31, so that the soldering legs of the QFNs are inserted into the upper tinning grooves 33, then the bidirectional motor 22 drives the worm 24 to rotate through the rotating shaft 23, the worm 24 drives the threaded rod 25 to rotate through the worm wheel 26, the threaded rod 25 moves downward through the lifting frame 27, the lifting frame 27 drives the upper tinning rack 31 to immerse into the tin pot 5, so that the QFNs are immersed into the tin metal solution in the tin pot 5 to perform the tinning step, since there are nine upper tinning grooves 33 on the upper tinning rack 31, the tinning step can be performed on the soldering legs of the nine QFNs at the same time.

[0043] It should be understood that the use of these embodiments is only for the purpose of illustrating the present application and is not intended to limit the scope of protection of the present application. In addition, it should also be understood that after reading the technical content of the present application, those skilled in the art can make various modifications, modifications and / or deformations to the present application, and all these equivalent forms also fall within the protection scope defined by the claims attached to the present application.

Claims

1. A QFN tin pot tinning tool, comprising a tool box (1), characterized in that: The inner cavity of the tooling box (1) is fixedly installed with a rapid tin filling mechanism (2); The rapid tin filling mechanism (2) comprises a fixing frame (21), the bottom of the fixing frame (21) is fixedly connected with the bottom of the inner cavity of the tooling box (1), the inner surface of the fixing frame (21) is fixedly installed with a bidirectional motor (22), the output end of the bidirectional motor (22) is fixedly installed with a rotating shaft (23) through a speed reducer, and the outer surface of the rotating shaft (23) is fixedly installed with a worm (24).

2. The QFN tin pot tinning tooling of claim 1, wherein: The rapid tin filling mechanism (2) further comprises a threaded rod (25), the outer surface of the threaded rod (25) is fixedly installed with a worm wheel (26), and the outer surface of the threaded rod (25) is threadedly installed with a lifting frame (27).

3. The QFN tin pot tinning tool of claim 2, wherein: The bottom end of the threaded rod (25) is rotatably connected with the bottom of the inner cavity of the tooling box (1), and the outer surface of the worm wheel (26) is engaged with the outer surface of the worm (24).

4. The QFN tin pot tinning tooling of claim 2, wherein: The bottom of the lifting frame (27) is fixedly installed with an upper tin filling mechanism (3), the upper tin filling mechanism (3) comprises an upper tin filling frame (31), the top of the upper tin filling frame (31) is provided with a placing groove (32), the top of the placing groove (32) is provided with an upper tin groove (33) penetratingly formed, and the top of the upper tin filling frame (31) and away from the placing groove (32) is provided with a solution observation groove (34).

5. The QFN tin pot tinning fixture of claim 4, wherein: The inner surface of the upper tin filling frame (31) is threadedly connected with the outer surface of the lifting frame (27).

6. The QFN tin pot tinning fixture of claim 1, wherein: The bottom of the inner cavity of the tooling box (1) is fixedly installed with a placing frame (4), and the top of the placing frame (4) is fixedly installed with a tin pot (5).

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