CN101179906A - Inner opening-shaped stannum port of spilled stannum port - Google Patents
Inner opening-shaped stannum port of spilled stannum port Download PDFInfo
- Publication number
- CN101179906A CN101179906A CNA2007101711335A CN200710171133A CN101179906A CN 101179906 A CN101179906 A CN 101179906A CN A2007101711335 A CNA2007101711335 A CN A2007101711335A CN 200710171133 A CN200710171133 A CN 200710171133A CN 101179906 A CN101179906 A CN 101179906A
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- tin
- stannum
- stannum export
- port
- export
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Abstract
The invention relates to a tin furnace part of PCBA board soldering tin, in particular a tin outlet of a tin furnace. A rectangle inner tube and outer tube form a tin outlet in a dual rectangular shape. The tin outlet on the inner tube is provided with a tin spill-way which is a rectangle opening with a depth of 2mm to 8mm. The invention has a simple structure and is capable of effectively increasing soldering efficiency and is applicable for large-scale automatic product; furthermore, oxidation layer on molten tin surface layer is effectively prevented from being retained on the surface of the PCBA board, and the quality of soldering spots is ensured.
Description
Technical field
The present invention relates to a kind of tin stove parts of the PCBA of being used for boards solder, especially a kind of stannum export of stannum furnace.
Background technology
Common wave-soldering adopts manual operations usually, and production efficiency is lower, for the comparatively intensive PCBA plate of need pad, this welding manner is more inadequate, in addition, because stannum export too small (generally long 2 millimeters), can bring the obstruction of scruff, thereby cause the large tracts of land of rosin joint to produce stannum export; At the comparatively intensive PCBA plate of pad, the stannum export of employing structure is also arranged, but common stannum export of stannum furnace is flat mouthful design, in order to realize scolding tin operation to the PCBA plate, generally need maintenance distance once between PCBA plate and stannum export, guarantee to make tin liquor can the electric elements on the PCBA plate of top be welded on the one hand from the stannum export ejection, guarantee simultaneously can in time discharge stannum export from the tin liquor of stannum export ejection subsequently, prevent that stannum export pressure is excessive, influence welding quality, but also there is fault of construction in this structure: when tin liquor when stannum export sprays, because the tin liquor of upper space is owing to directly contact the formation oxide layer with air, this part oxide layer at first contacts with the PCBA plate of top along with tin liquor is gushed out from stannum export, in the wings under the frontal impact of tin liquor, make this part oxide layer oppressed on PCBA plate face, be difficult for it being taken away, make oxide layer remain between solder joint and the PCBA plate, have a strong impact on welding quality by the stannum export tin liquor of gushing out subsequently.
Summary of the invention
In order to overcome the deficiency that above-mentioned various scolding tin exists, when especially adopting the intensive PCBA plate of the point-to-point wave-soldering butt welding point of automatic selectivity to weld, inefficiency, be unsuitable for extensive batch machining, and contact easily forms the deficiency of rosin joint, the invention provides a kind of simple in structurely, can effectively improve welding efficiency, guarantee the stannum export of stannum furnace of the quality of welded contact.
The technical solution adopted for the present invention to solve the technical problems is: open back shape type stannum export in a kind of excessive tin mouth, form back the shape stannum export by the interior pipe and the outer tube of rectangle, the stannum export stannum export of interior pipe is provided with the Xi Kou that overflows.The electronic devices and components to be welded that described structure is mainly used on the PCBA plate are mainly concentrated the welding that is distributed in back the close medial region in shape weld zone.
For the ease of the processing of the Xi Kou that overflows, guarantee the tin liquor Xi Kou outflow of can overflowing equably simultaneously, further: described excessive Xi Kou is a rectangle gap.
For the degree of depth of the Xi Kou that overflows rationally is set, crossing shallow may rising comes the Xi Kou that overflows excessive tin effect should be arranged, cross and to cause tin liquor before the stannum export of emerging, just to flow out deeply from the Xi Kou that overflows, make the emerge height of stannum export of tin ripple on the low side, influence welding quality, more further: the degree of depth of described excessive Xi Kou is 2～8mm.
The existence of excessive Xi Kou can effectively change the flow direction of tin liquor behind the ejection stannum export.After tin liquor sprays from stannum export, tin liquor can preferentially flow out from the Xi Kou that overflows, so just form certain tin stream that flows to, making the oxide layer of the superiors can directly do not impacted is adsorbed onto on the PCBA plate, even there is the partial oxidation layer to be adsorbed onto on the PCBA plate, can be washed away by the tin liquor that sprays from stannum export subsequently, having guaranteed can residual oxide layer not influence the soldering quality between scolding tin and PCBA plate yet; On the other hand, because surface tension, tin liquor upper surface in the stannum export is spherical shape, make under the not high situation of furnace pressure, may appear at stannum export edge and form rosin joint, influence welding quality, the existence of excessive Xi Kou, change the flow direction of stannum export tin liquor, made tin liquor can maximum possible cover the PCBA plate of stannum export top, guaranteed the adequacy and the fastness of welding.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a stannum export structural representation of the present invention.
Fig. 2 is the placement location schematic diagram of the present invention on the PCBA plate.
1. interior pipe 2. outer tubes 3. excessive tin mouth 4.PCBA plate 5. electronic devices and components among the figure
Embodiment
Open back shape type stannum export in a kind of excessive tin mouth as shown in Figure 1, form back the shape stannum export by the interior pipe 1 and the outer tube 2 of rectangle, the stannum export stannum export of interior pipe 1 is provided with the tin mouth 3 that overflows.Described excessive tin mouth 3 is a rectangle gap, and its degree of depth is 2～8mm.
As shown in Figure 2, stannum export of the present invention is mainly used in the electronic devices and components to be welded 5 main concentrated welding that are distributed in back the shape weld zone near medial region on the PCBA plate 4.
During use, PCBA plate 4 is placed on the precalculated position of stannum export top, and board plane and stannum export stannum export are maintained a certain distance, generally be controlled at 2～6mm.The shape of stannum export can be determined according to the distribution situation of PCBA plate 4 welding positions.Tin liquor keeps earlier certain liquid level to store in stannum export 1～3 minute, the PCBA plate to be welded 4 of top is carried out preheating, so that preceding operation is removed the oxide layer on the PCBA plate 4 at the scaling powder generation chemical reaction of PCBA plate 4 positions to be welded sprayings.Afterwards, the electronic startup of tin stove, push to stannum export by the tin liquor of exerting pressure the tin furnace interior, the continuous lifting of tin liquor face in the stannum export, and tin liquor ejects the stannum export stannum export the most at last, contacts with the PCBA plate 4 of top and welds, guaranteeing that tin liquor and PCBA plate 4 fully weld, excessive tin mouth 3 on the interior pipe 1 is discharged, and takes away the oxide layer and the impurity of tin liquor top layer, also makes the electronic devices and components 5 near excessive tin mouth 3 obtain the welding of abundant tin liquor.At last, take off PCBA plate 4, finish the welding of stannum export top electronic devices and components 5 on the ground PCBA plate 4 from the stannum export top.
Because adopted stannum export method for designing flexibly, enlarged effective solder side, thereby made speed of welding fast on year-on-year basis more than three times with international " automatic selectivity welding tin stove ".
Because stannum export has adopted excessive tin mouth design, this scheme has just been removed the main scruff of welding quality and the oxide skin on tin liquor surface of influencing before welding, the qualification rate of welding is reached more than 99.9%.
Claims (3)
1. open back shape type stannum export in an excessive tin mouth, it is characterized in that: interior pipe (1) and outer tube (2) by rectangle are formed back the shape stannum export, and the stannum export stannum export of interior pipe (1) is provided with the Xi Kou (3) that overflows.
2. open back shape type stannum export in the excessive tin mouth according to claim 1, it is characterized in that: described excessive Xi Kou (3) is a rectangle gap.
3. open back shape type stannum export in the excessive tin mouth according to claim 2, it is characterized in that: the degree of depth of described excessive Xi Kou (3) is 2～8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101711335A CN101179906A (en) | 2007-11-28 | 2007-11-28 | Inner opening-shaped stannum port of spilled stannum port |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101711335A CN101179906A (en) | 2007-11-28 | 2007-11-28 | Inner opening-shaped stannum port of spilled stannum port |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101179906A true CN101179906A (en) | 2008-05-14 |
Family
ID=39405936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101711335A Withdrawn CN101179906A (en) | 2007-11-28 | 2007-11-28 | Inner opening-shaped stannum port of spilled stannum port |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101179906A (en) |
-
2007
- 2007-11-28 CN CNA2007101711335A patent/CN101179906A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C04 | Withdrawal of patent application after publication (patent law 2001) | ||
| WW01 | Invention patent application withdrawn after publication |