Efficient backflow electrotinning equipment

Abstract

The embodiment of the utility model provides efficient backflow electrotinning equipment which comprises a plated material belt, a hot air box and a cold air box, a heating device is arranged in the hot air box, the heating device comprises hot air heads arranged in a hot air area, the hot air heads are connected with a heating fan, and the plated material belt passes through the space between the two hot air heads; a cooling device is arranged in the cold air box and comprises a cold air opening formed in the bottom of the cold air area, the cold air opening is connected with an air cooler, an airflow guiding piece is arranged on the edge of the cold air opening, and a plated material belt passes through the upper portion of the airflow guiding piece and outputs hot air through a heating fan. The surface tin layer of the plated material belt is melted, the internal stress of the tin layer is reduced, a bright outer layer is formed, then cold air is output through the air cooler to cool the plated material belt passing through the airflow guide piece, so that the tin layer is firm, the internal stress of the tin layer can be reduced through the means, and tin whiskers are effectively prevented from growing.

Description

Technical Field

[0001] This utility model relates to, but is not limited to, the field of electroplating equipment, and particularly to a high-efficiency reflow tin plating equipment. Background Technology

[0002] Electroplating is a process of depositing a layer of metal onto a metal surface. It generates a metal film with specific properties on the metal surface, which can improve corrosion resistance, beautify the surface, and improve the physical and chemical properties of the metal surface.

[0003] Tin is a common electroplating metal. In the tin electroplating process, there are usually two states: bright tin and matte tin. During the electroplating process, tin and copper diffuse into each other to form intermetallic compounds, which causes the stress in the tin layer to increase rapidly. This causes tin atoms to diffuse along the crystal boundary to form tin whiskers, resulting in defective products. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, this utility model provides a high-efficiency reflow tin plating equipment, which solves the technical problem that in some electroplating processes, tin and copper diffuse into each other to form metal compounds, causing the stress in the tin layer to increase rapidly, and causing tin atoms to diffuse along the crystal boundary to form tin whiskers, resulting in defective products.

[0006] (II) Technical Solution

[0007] The purpose of this utility model is to provide a high-efficiency reflow tin plating equipment, which includes a strip to be plated, a hot air box, and a cold air box. The hot air box is located adjacent to the cold air box. The hot air box and the cold air box are respectively provided with a hot air zone and a cold air zone. A heating device is provided in the hot air box. The heating device includes a hot air head located in the hot air zone. The hot air head is connected to a heating fan. There are two or more hot air heads, which are arranged opposite each other in pairs. The strip to be plated passes between two hot air heads.

[0008] The cold air box is equipped with a cooling device, which includes a cold air inlet located at the bottom of the cold air zone. The cold air inlet is connected to a cold air blower, and an airflow guide is provided at the edge of the cold air inlet. The material to be plated passes over the airflow guide.

[0009] Preferably, an insulation cover is provided above the hot air zone, and a set of limit wheels is also provided inside the hot air zone.

[0010] Preferably, a partition plate is provided between the hot air box and the cold air box, and the partition plate is provided with a feeding hole.

[0011] Preferably, both the hot air box and the cold air box are provided with limiting guide wheels, and the number of limiting guide wheels is more than two, and they are arranged opposite each other in pairs.

[0012] Preferably, the heating fan is located at the bottom of the hot air box, and an air supply pipe is connected between it and the hot air head inside the hot air box.

[0013] Preferably, the air cooler is located at the bottom of the air cooler box, and an air supply pipe is provided between it and the air vent inside the air cooler box.

[0014] Preferably, a hot air flow channel is formed between the hot air heads.

[0015] Preferably, the airflow guide includes an airflow channel, a left wind deflector, a right wind deflector, and a fixing plate. The left and right wind deflectors are disposed on both sides of the airflow channel, and the number of fixing plates is two, which are respectively disposed on both sides of the left and right wind deflectors.

[0016] (III) Beneficial Effects

[0017] By outputting hot air through a heating fan, the hot air flow formed between two hot air heads is first used to heat the strip to be plated, so that the tin layer on the surface of the strip melts and reduces its internal stress, forming a bright outer layer. Then, cold air is output through a cooling fan to cool the strip to be plated through the airflow guide, so as to make the tin layer firm. The above methods can reduce the internal stress of the tin layer and effectively prevent tin whisker growth. Attached Figure Description

[0018] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0019] Figure 1 This is a top view of the overall structure of a high-efficiency reflow tin plating equipment;

[0020] Figure 2 This is a main view of the overall structure of a high-efficiency reflow tin plating equipment;

[0021] Figure 3 This is a schematic diagram of two hot air heads facing each other to form a hot air flow channel in a high-efficiency reflow tin plating equipment;

[0022] Figure 4 This is a front view of the airflow guide of a high-efficiency reflow tin plating equipment.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Plated strip; 2. Hot air box; 3. Cold air box; 4. Hot air zone; 5. Cold air zone; 6. Hot air head; 7. Heating fan; 8. Cold air outlet; 9. Cold air fan; 10. Air flow guide; 101. Air flow channel; 102. Left wind deflector; 103. Right wind deflector; 104. Fixed plate; 105. Locking screw; 11. Heat preservation cover; 12. Limit wheel set; 13. Partition board; 14. Feeding through hole; 15. Limit guide wheel; 16. Air supply pipe; 17. Gas transmission pipe; 18. Hot air flow channel. Detailed implementation mode

[0025] In order to make the purpose, technical solution and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0026] The following combines the attached Figures 1 to 4 , for further description. The present utility model discloses an efficient reflux electroplating tin device, which includes a plated strip 1, a hot air box 2 and a cold air box 3. Among them, the workpiece after tin plating is on the plated strip 1. The hot air box 2 is arranged adjacent to the cold air box 3. A hot air zone 4 and a cold air zone 5 are respectively arranged in the hot air box 2 and the cold air box 3. A heating device is arranged in the hot air box 2. The heating device includes a hot air head 6 arranged in the hot air zone 4. The hot air head 6 is connected with a heating fan 7. The number of hot air heads 6 is more than 2 and they are arranged opposite to each other in pairs. The plated strip 1 passes between two opposite hot air heads 6, and the hot air output by the two hot air heads 6 will heat the surface of the plated strip 1. The heating temperature is about 285 degrees Celsius to melt the foggy tin layer formed on the surface of the plated strip, so that the surface of the tin layer becomes a bright tin layer, and the internal stress in the heated coating layer will be further reduced;

[0027] A cooling device is arranged in the cold air box 3. The cooling device includes a cold air outlet 8 arranged at the bottom of the cold air zone 5. The cold air outlet 8 is connected with a cold air fan 9. An air flow guiding member is arranged at the edge of the cold air outlet 8. The plated strip 1 passes above the air flow guiding member, and the cold air output by the cold air fan 9 will cool the formed bright tin layer to facilitate the discharging efficiency.

[0028] In a preferred embodiment, a heat preservation cover 11 is arranged above the hot air zone 4, and a limit wheel set 12 is also arranged inside the hot air zone 4. The limit wheel set 12 is in a "C" shape, and guide wheels (not shown in the figure) for limiting the plated strip 1 are arranged at its upper and lower ends. Among them, 3 limit wheel sets 12 are arranged in the hot air zone 4.

[0029] In a preferred embodiment, a partition board 13 is arranged between the hot air box 2 and the cold air box 3. A feeding through hole 14 is arranged on the partition board 13 to facilitate the passing of the plated strip.

[0030] In a preferred embodiment, both the hot air box 2 and the cold air box 3 are provided with limiting guide wheels 15. There are two or more limiting guide wheels 15, which are arranged opposite to each other in pairs. There is a space between the two opposing limiting guide wheels 15 to allow the material to be plated strip 1 to pass through. The two opposing limiting guide wheels 15 will simultaneously limit the left and right sides of the material to be plated strip 1 as it passes through.

[0031] In a preferred embodiment, a heating fan 7 is disposed at the bottom of the hot air box 2, and an air supply pipe 16 is connected between the heating fan 7 and the hot air head 6 inside the hot air box 2.

[0032] In a preferred embodiment, the air cooler 9 is located at the bottom of the air cooler box 3, and an air supply pipe 17 is provided between the air cooler 9 and the air vent 8 inside the air cooler box 3.

[0033] In a preferred embodiment, a hot air flow channel 18 is formed between two opposing hot air heads 6. When the strip to be plated 1 passes through the hot air flow channel 18, the hot air flow output by the hot air head 6 will heat the workpiece on the strip to be plated 1, so as to achieve the purpose of turning the tin layer surface into a bright tin layer.

[0034] In a preferred embodiment, the airflow guide includes an airflow channel 101, a left baffle plate 102, a right baffle plate 103, and a fixing plate 104. The left baffle plate 102 and the right baffle plate 103 are disposed on both sides of the airflow channel 101 to guide the output cold airflow and improve the cooling efficiency to a certain extent. There are two fixing plates 104, which are respectively disposed on both sides of the left baffle plate 102 and the right baffle plate 103. The fixing plate 104 is provided with locking screws 105 to install and fix the airflow guide 10.

[0035] In summary, by using a heating fan to output hot air, a hot airflow is first formed between two hot air heads to heat the strip to be plated, melting the surface tin layer and reducing its internal stress to form a bright outer layer. Then, a cooling fan outputs cold air to cool the strip passing through the airflow guide, ensuring a firm tin layer. These methods reduce the internal stress of the tin layer, effectively preventing tin whisker growth, and the direct transition from melting to cooling improves production continuity and further increases production efficiency.

[0036] Although the technical solutions according to the present invention have been described with reference to several different embodiments, aspects and features, it is not intended to limit the scope of the present invention, but modifications thereof are included within the broad scope of the foregoing disclosure, drawings and claims.

Claims

1. A high-efficiency reflow tin plating equipment, comprising a strip to be plated, a hot air box, and a cold air box, wherein the hot air box is disposed adjacent to the cold air box, and the hot air box and the cold air box are respectively provided with a hot air zone and a cold air zone, characterized in that: The hot air box is equipped with a heating device, which includes a hot air head located in the hot air zone. The hot air head is connected to a heating fan. There are two or more hot air heads, which are arranged opposite each other. The strip to be plated passes between two hot air heads. The cold air box is equipped with a cooling device, which includes a cold air inlet located at the bottom of the cold air zone. The cold air inlet is connected to a cold air blower, and an airflow guide is provided at the edge of the cold air inlet. The material to be plated passes over the airflow guide.

2. The high-efficiency reflow tin plating equipment according to claim 1, characterized in that: An insulation cover is provided above the hot air zone, and a set of limit wheels is also provided inside the hot air zone.

3. The high-efficiency reflow tin plating equipment according to claim 1, characterized in that: A partition plate is provided between the hot air box and the cold air box, and a feeding hole is provided on the partition plate.

4. The high-efficiency reflow tin plating equipment according to claim 1, characterized in that: Both the hot air box and the cold air box are equipped with limiting guide wheels, and there are more than two limiting guide wheels, which are arranged opposite each other.

5. The high-efficiency reflow tin plating equipment according to claim 1, characterized in that: The heating fan is located at the bottom of the hot air box, and an air supply pipe connects it to the hot air head inside the hot air box.

6. The high-efficiency reflow tin plating equipment according to claim 1, characterized in that: The air cooler is located at the bottom of the air cooler box, and an air supply pipe is installed between it and the air vent inside the air cooler box.

7. The high-efficiency reflow tin plating equipment according to claim 1, characterized in that: A hot air flow channel is formed between the hot air heads.

8. The high-efficiency reflow tin plating equipment according to claim 1, characterized in that: The airflow guide includes an airflow channel, a left wind deflector, a right wind deflector, and a fixing plate. The left and right wind deflectors are located on both sides of the airflow channel, and there are two fixing plates, which are respectively located on both sides of the left and right wind deflectors.

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