CN218755978U - Atmosphere Protection Air Knife - Google Patents
Atmosphere Protection Air Knife Download PDFInfo
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- CN218755978U CN218755978U CN202222577935.9U CN202222577935U CN218755978U CN 218755978 U CN218755978 U CN 218755978U CN 202222577935 U CN202222577935 U CN 202222577935U CN 218755978 U CN218755978 U CN 218755978U
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- air knife
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- wind shield
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Abstract
The utility model provides an atmosphere protection air knife, which comprises an air knife, wherein the upper end of the air knife is fixedly connected with an upper protection cover, and the interior of the upper protection cover forms an upper protection cavity; the lower end of the air knife is fixedly connected with a lower protective cover, and a lower protective cavity is formed inside the lower protective cover; the lower protective cover comprises a first cover body and a wind shield sheet arranged in the first cover body; the first cover body is of a pipe shape, the upper end of the first cover body is fixed with the air knife in a sealing way, and the lower end of the first cover body is opened; the main body of the wind shield sheet is downwards inclined from the edge to the center to form a funnel shape, and the center of the wind shield sheet is provided with a middle hole; a plurality of strip holes are vertically and uniformly formed in the first cover body; the upper end of the wind-shielding sheet is flush with the upper end of the strip hole, and the height of the lower end of the wind-shielding sheet is equal to the height of the middle point of the strip hole. The utility model discloses can all carry out inert gas from welding and take out tin liquid level to the solidification of surface solder and protect to reach and reduce the purpose of welding and taking surface oxidation.
Description
Technical Field
The utility model relates to an atmosphere protection air knife belongs to and welds area production facility technical field.
Background
When a lead-free solder ribbon is produced using a conventional process, the following problems occur: 1. the surface of the lead-free solder is easy to oxidize to form a flaky oxide layer, the oxide layer is brittle, and the lead-free solder can expose the interior of the solder to cause deep oxidation when falling to a certain extent in the contact process of the guide wheel, so that the weldability of the solder strip is influenced; 2. after the tin strip is taken out of the tin furnace, because the solder has poorer liquidity than tin-lead solder, tiny oxidation particles are easily generated after the solder is contacted with oxygen, and the liquidity of the solder is reduced by the small particles, tin nodules are easily formed on the surface of the solder strip, so that the appearance of a product is rough, and the size of the product exceeds the standard.
Therefore, the conventional solder strip production process is not suitable for the production of lead-free solder and some adjustments are required.
Because the production of the current solder strip uses an air knife, the invention mainly needs to solve two problems: 1. at the lower end of the air knife, the air knife continuously outputs airflow, so that a stable positive pressure state needs to be kept, and the air cannot interfere with the wind power action of the air knife on the welding strip in the protection cavity. 2. Because the tin liquid level has certain fluctuation in the production process, the lower end protection cavity also needs to have the capacity of adapting to the lifting of a certain tin liquid level. 3. The upper end of the air knife needs to have certain refrigerating capacity so as to ensure that the solder on the surface of the tin strip can be completely solidified within a protection distance, and meanwhile, positive pressure atmosphere needs to be formed in the protection cavity so as to prevent air from flowing in.
Disclosure of Invention
The embodiment of the utility model provides an atmosphere protection air knife can all carry out inert gas from welding and take out tin liquid level to the solidification of surface solder and protect to the not enough that exists among the prior art, thereby reach and reduce the mesh of welding and taking surface oxidation.
In order to realize the technical purpose, the embodiment of the utility model provides an adopt technical scheme is:
an atmosphere protection air knife comprises an air knife, wherein the upper end of the air knife is fixedly connected with an upper protection cover, and an upper protection cavity is formed inside the upper protection cover; the lower end of the air knife is fixedly connected with a lower protective cover, and a lower protective cavity is formed inside the lower protective cover;
the lower protective cover comprises a first cover body and a wind shield sheet arranged in the first cover body; the first cover body is of a pipe shape, the upper end of the first cover body is fixed with the air knife in a sealing way, and the lower end of the first cover body is opened;
the main body of the wind shield sheet is downwards inclined from the edge to the center to form a funnel shape, and the center of the wind shield sheet is provided with a middle hole; a plurality of strip holes are vertically and uniformly formed in the first cover body; the upper end of the wind-shielding sheet is flush with the upper end of the strip hole, and the height of the lower end of the wind-shielding sheet is equal to the height of the middle point of the strip hole.
Furthermore, the upper protective cover comprises a second cover body and a third cover body which are communicated with each other into a whole, and the main bodies of the second cover body and the third cover body are tubular; the lower end of the second cover body is fixed with the air knife in a sealing mode, the upper portion and the lower portion of the third cover body are respectively provided with an air inlet, and the upper end of the third cover body is open.
Further, the diameter of the third cover body is smaller than that of the second cover body.
Furthermore, the lower protective cover adopts stainless steel, aluminum alloy or glass material.
Furthermore, the distance between the upper end of the long hole and the upper edge of the first cover body is 9-11mm, the length of the long hole is 5-10mm, and the distance between the lower end of the long hole and the lower edge of the first cover body is 4-6mm.
Further, the aperture of the middle hole is 2.5 to 3 times of the aperture of the air knife.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is:
the utility model discloses can form atmosphere protection before tin takes surface solder solidifies completely, make the tin area accomplish the integer and solidify under the anaerobic condition, the surface does not have the oxide layer almost, can eliminate surface particle completely for no matter there is showing the improvement in outward appearance or weldability to the unleaded solder.
Drawings
Fig. 1 is a schematic structural diagram in an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of an embodiment of the present invention.
Fig. 3 is a sectional view of the air knife and the lower protective cover in the embodiment of the present invention.
Fig. 4 is a cross-sectional view of a lower protective cover according to an embodiment of the present invention.
Fig. 5 is a schematic structural view of a lower protection cover portion in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides an atmosphere protection air knife, including an air knife 1; the upper end of the air knife 1 is fixedly connected with an upper protective cover 2, and an upper protective cavity is formed inside the upper protective cover 2; the lower end of the air knife 1 is fixedly connected with a lower protective cover 3, and a lower protective cavity is formed inside the lower protective cover 3;
as shown in fig. 3, 4 and 5, the lower protective cover 3 includes a first cover 301 and a wind-blocking sheet 302 provided in the first cover 301; the first cover body 301 is of a tube shape, the upper end of the first cover body 301 is fixed with the air knife 1 in a sealing mode, and the lower end of the first cover body 301 is opened;
the main body of the wind shield sheet 302 is inclined downwards from the edge to the center to form a funnel shape, and the center of the wind shield sheet 302 is provided with a middle hole 304; a plurality of strip holes 303 are vertically and uniformly arranged on the first cover body 301; the upper end of the wind-shielding sheet 302 is flush with the upper end of the long hole 303, and the height of the lower end of the wind-shielding sheet 302 is equal to the height of the midpoint of the long hole 303.
Wherein, the lower protective cover 3 is made of stainless steel, aluminum alloy or glass and other materials which do not react with or are mutually soluble with the solder. The total height of the lower protection cover 3 is about 20mm, the part overlapped with the air knife 1 is about 4-5 mm, the lower end of the air knife 1 is adhered by high-temperature resistant sealant, long holes 303 are arranged at positions 10mm away from the upper edge at uniform intervals, the length of each hole is 5-10mm, and the height of each hole is about 5mm below each long hole 303. The lower protection cover 3 is internally provided with a wind shield 302 with a certain inclination, the upper edge of the wind shield 302 is flush with the upper end of the strip hole 303, the height of the middle hole 304 is equal to the height of the midpoint of the strip hole 303, and the aperture of the middle hole 304 is about 2.5 to 3 times of the aperture of the air knife 1.
As shown in fig. 1 and 2, the upper protective cover 2 includes a second cover 201 and a third cover 202 which are integrally communicated with each other, and the main bodies of the second cover 201 and the third cover 202 are tubular; the lower end of the second cover body 201 is fixed with the air knife 1 in a sealing way, the upper part and the lower part of the third cover body 202 are respectively provided with an air inlet 203, and the upper end of the third cover body 202 is opened. Further, the diameter of the third cover 202 is smaller than that of the second cover 201. The larger diameter of the second enclosure 201 is coupled to the air knife 1 and the smaller diameter of the third enclosure 202 reduces the nitrogen flow.
During production, the lower edge of the lower protective cover 3 can be completely immersed in the molten tin, and the liquid level height can be adjusted to the middle position of the strip-shaped hole 303, so that the liquid level can be kept in the range of the strip-shaped hole 303 all the time no matter the liquid level is reduced due to molten tin loss or is increased (generally within the range of +/-2 mm) when solder is periodically replenished, and a good air outlet effect can be always kept. When air knife 1 continuously blows, wind can blow to the tin area that is close to the tin liquid position earlier, reach control coating about, then can blow to the tin liquid surface through the well 304 in the middle of wind-blocking piece 302 and here the air knife also leads to the nitrogen gas, in order to reduce the solder oxidation, later can form the gas backward flow after being reflected by the tin liquid surface, guided to outer wall department by wind-blocking piece 302, discharge through rectangular hole 303, if do not have wind-blocking piece 302, the air current of backward flow has probably been used to the tin area, cause the air current to interfere, cause bad phenomena such as tin is inhomogeneous. Thus, the lower end of the air knife is completely protected by nitrogen gas, and air is isolated.
The tin belt passes through the air knife 1 and then enters the upper protective cover 2, the upper protective cover 2 is used for carrying out atmosphere protection on solder on the surface of the tin belt before solidification, surface curing is reduced, nitrogen is introduced through the two air inlets 203, and a positive pressure state is formed in the cavity to isolate air from entering. Therefore, the length thereof is set according to the tin plating line speed. The upper protective cover 2 is made of the same material as the lower protective cover 3 and is also bonded with the air knife by high-temperature resistant sealant.
For example, when the linear velocity is 180m/min and the solder temperature is 230 ℃, the temperature of the rear surface of the tin ribbon passing through the air knife 1 is reduced to about 200 ℃, the natural heat dissipation efficiency is about 25 ℃/S, the curing temperature is 183 ℃, the cooling time is 0.68S, the cooling length is 2.04 m, and the cooling effect is accelerated when a certain amount of nitrogen is introduced into the protective cover, so the length of the upper protective cover 2 is designed to be in the range of 1.5m to 2m. At this time, nitrogen gas of 0.05 to 0.1MPa is introduced, so that the tin tape is completely solidified when the tin tape is taken out of the protective cover, and bright and uniform appearance is obtained.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (6)
1. The atmosphere protection air knife is characterized by comprising an air knife (1), wherein the upper end of the air knife (1) is fixedly connected with an upper protection cover (2), and an upper protection cavity is formed inside the upper protection cover (2); the lower end of the air knife (1) is fixedly connected with a lower protective cover (3), and a lower protective cavity is formed inside the lower protective cover (3);
the lower protective cover (3) comprises a first cover body (301) and a wind shield sheet (302) arranged in the first cover body (301); the first cover body (301) is of a pipe shape, the upper end of the first cover body (301) is fixed with the air knife (1) in a sealing mode, and the lower end of the first cover body (301) is provided with an opening;
the main body of the wind shield piece (302) inclines downwards from the edge to the center to form a funnel shape, and the center of the wind shield piece (302) is provided with a middle hole (304); a plurality of strip holes (303) are vertically and uniformly arranged on the first cover body (301); the upper end of the wind shield sheet (302) is flush with the upper end of the long hole (303), and the lower end of the wind shield sheet (302) is as high as the middle point of the long hole (303).
2. The atmosphere protection air knife according to claim 1, characterized in that the upper protection cover (2) comprises a second cover body (201) and a third cover body (202) which are communicated with each other into a whole, and the main bodies of the second cover body (201) and the third cover body (202) are tubular; the lower end of the second cover body (201) is fixed with the air knife (1) in a sealing mode, the upper portion and the lower portion of the third cover body (202) are respectively provided with an air inlet (203), and the upper end of the third cover body (202) is open.
3. The atmospheric protection air knife of claim 2, characterized in that the diameter of the third enclosure (202) is smaller than the diameter of the second enclosure (201).
4. An atmosphere protection air knife according to claim 1, characterized in that the lower protection cover (3) is made of stainless steel, aluminum alloy or glass.
5. The atmosphere protection air knife according to claim 1, wherein the upper end of the elongated hole (303) is 9-11mm away from the upper edge of the first cover (301), the hole length of the elongated hole (303) is 5-10mm, and the lower end of the elongated hole (303) is 4-6mm away from the lower edge of the first cover (301).
6. The atmosphere protection air knife according to claim 1, wherein the aperture of the intermediate hole (304) is 2.5 to 3 times of the aperture of the air knife (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222577935.9U CN218755978U (en) | 2022-09-28 | 2022-09-28 | Atmosphere Protection Air Knife |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222577935.9U CN218755978U (en) | 2022-09-28 | 2022-09-28 | Atmosphere Protection Air Knife |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218755978U true CN218755978U (en) | 2023-03-28 |
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ID=85696271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222577935.9U Active CN218755978U (en) | 2022-09-28 | 2022-09-28 | Atmosphere Protection Air Knife |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218755978U (en) |
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2022
- 2022-09-28 CN CN202222577935.9U patent/CN218755978U/en active Active
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