A tin coating apparatus and method for composite strips

Abstract

A tin-coating device for composite strip includes a tin-coating mold. Strip limiting blocks are arranged on both the left and right sides of the tin-coating mold, and multiple partitions are arranged between two strip limiting blocks. The position of each partition is adjustable according to the number and width of the tin-coating channels. Adjustment mechanisms are respectively arranged on the left and right sides of the tin-coating mold. Each adjustment mechanism includes an adjusting screw, which is supported by bearings in an adjusting handle on a mounting frame. Multiple movable frames are threaded onto the adjusting screw in sequence. The connecting arm of each movable frame is connected to a partition. Each movable frame has a U-shaped opening groove, into which a nut block is inserted. The lower end of the nut block has a semi-circular threaded opening groove that threadedly engages with the adjusting screw. The nut block is locked by a positioning pin on the movable frame. Using this device and method, the position, width, and number of strips to be coated with tin on the composite strip are controllable. The tin-coating device is simple to adjust, the process is streamlined, efficiency is high, and it is environmentally friendly and pollution-free.

Description

Technical Field

[0001] This invention belongs to the field of hot-dip tinning, and specifically relates to a tinning apparatus and method for composite strips. Background Technology

[0002] For components that require soldering, such as semiconductor packages, crystal oscillators, lead frames, and photovoltaic cells, the surface of the composite strip or component is usually fully covered by hot-dip tin coating or electroplating. However, some fields only require partial soldering of composite strips or components, such as oscillators for automotive motors.

[0003] Currently, the method for selective tin coating on the surface of composite strips is as follows: A thin film is typically applied to areas of the composite strip where soldering is not required, followed by full-coverage tin plating. The film is then removed, achieving selective tin coating. However, to avoid the formation of intermetallic compounds between the substrate and plating materials during electroplating, which could affect the circuit current after component assembly, a nickel layer is usually pre-plated on the composite strip surface as a barrier layer. The disadvantages of this method are: ① The cyanide used for complexing electroplating is highly environmentally harmful; ② The process of plating nickel before tin and applying and removing the film is complex; ③ The nickel transition layer wastes resources and increases production costs. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a tin coating device and method for composite strips. This method allows for selective coating of the tin layer in terms of position, width, and number of strips, based on the requirements of the composite strip. The tin coating device is easy to adjust, the process is streamlined, the tin coating efficiency is high, unnecessary waste is avoided, and the process is environmentally friendly and pollution-free.

[0005] The objective of this invention is achieved as follows:

[0006] A tin-coating device for composite strip includes a tin-coating mold for coating a tin layer onto the composite strip. Strip limiting blocks are provided on the left and right sides of the tin-coating mold. Multiple partitions for forming tin-coating channels are provided between two strip limiting blocks. The position of each partition can be adjusted according to the number and width of the tin-coating channels. Adjustment mechanisms for the partitions are provided on the left and right sides of the tin-coating mold. Each adjustment mechanism includes an adjusting screw, which is supported by a bearing in an adjusting handle on a mounting frame. Multiple movable frames are sequentially threaded onto the adjusting screw. A connecting arm of each movable frame is connected to a partition. Each movable frame has a U-shaped opening groove into which a nut block is inserted. The lower end of the nut block has a semi-circular opening groove. The inner wall of the opening groove is threaded to engage with the adjusting screw. The nut block is locked by a positioning pin on the movable frame. The connecting arms of each movable frame slide to form a circumferential limit. The outermost movable frame slides to form a circumferential limit with the mounting frame.

[0007] The strip limiting block is adjustable in position. The strip limiting block has an L-shaped cross-section. The horizontal arm of the strip limiting block has two strip-shaped fixing holes in the middle. Four fastening holes are provided on both sides of the strip-shaped fixing holes. The position of the strip limiting block is adjusted by adjusting bolts through the strip-shaped fixing holes. The position of the moving frame is fastened by locking bolts through the fastening holes.

[0008] The front and rear ends of the tin coating channel are respectively provided with guide plates, and the guide plates are provided with guide grooves. One guide groove is connected to the tin flow inlet, and the other guide groove is connected to the tin flow outlet.

[0009] The partition includes a first partition, a second partition, a third partition, a fourth partition, a fifth partition, a sixth partition, a seventh partition, and an eighth partition. The first partition, the second partition, the third partition, and the fourth partition all have Z-shaped corners bent to the left at both ends, and the fifth partition, the sixth partition, the seventh partition, and the eighth partition all have Z-shaped corners bent to the right at both ends.

[0010] A first soldering channel is formed between the first and second partitions. The corners of the second and third partitions are closed and do not form a soldering channel. A second soldering channel is formed between the third and fourth partitions. A baffle is provided at the corners of the fourth and fifth partitions, so no soldering channel is formed. A third soldering channel is formed between the fifth and sixth partitions. The corners of the sixth and seventh partitions are closed and do not form a soldering channel. A fourth soldering channel is formed between the seventh and eighth partitions.

[0011] The lower end of the adjustment mechanism is provided with a connecting plate, and both ends of the connecting plate are provided with two strip-shaped guide grooves. The lower end of the movable frame is provided with two downward-extending guide posts. The guide posts are inserted into the strip-shaped guide grooves for sliding engagement, and the lower end of the guide posts is locked with a nut.

[0012] The adjustment handle and the guide plate are both fixedly connected to the mounting frame by bolts.

[0013] A method for tin coating a composite strip includes the following steps:

[0014] 1) Surface treatment: After cleaning the surface of the composite strip with a lint-free cloth, apply flux;

[0015] 2) Tin coating: Under a protective atmosphere, the composite strip is rapidly tinned by contacting the tin flow through a tin coating device;

[0016] 3) Cooling: The composite strip obtained after tin coating is conveyed by guide rollers and cooled online.

[0017] Step 2) The protective atmosphere is nitrogen or argon.

[0018] Step 2) The direction of the tin flow is horizontally opposite to the direction of the composite strip drive.

[0019] The beneficial effects of this invention are:

[0020] 1. Controllable tin coating: It can selectively apply tin to specified positions, widths, and numbers of strips according to the requirements of the composite strip to be tinned;

[0021] 2. Stable and efficient tinning: The molten tin flows horizontally and counter-clockwise through the tinning die and the composite strip. The contact distance and time between the composite strip and the tin flow are long, the tin flow surface is stable, the tinning is uniform, and the tin flow speed can be accelerated to improve the tinning efficiency.

[0022] 3. Simplified process: The process is simplified by reducing steps such as film application, nickel plating, and film removal;

[0023] 4. Energy saving and environmental protection: It avoids the use of cyanide for complexation, reducing environmental pollution, and avoids nickel plating, reducing the consumption of metal resources. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the tin coating device of the present invention;

[0025] Figure 2 This is a schematic diagram of the upper structure of the tin-coating mold and adjustment mechanism of the present invention;

[0026] Figure 3 This is a schematic diagram of the lower structure of the tin-coating mold and adjustment mechanism of the present invention;

[0027] Figure 4 This is a partial cross-sectional view of the tin-coating mold of the present invention;

[0028] Figure 5 This is a partial structural schematic diagram of the adjustment mechanism of the present invention;

[0029] Figure 6 This is a flowchart of the present invention;

[0030] Figure 7 This is a schematic diagram of a double-strand composite strip to be tin-coated;

[0031] Figure 8 This is a schematic diagram of three composite strips to be tin-coated.

[0032] Explanation of reference numerals in the attached drawings: Solder inlet 1a, Solder outlet 1b, Soldering mold 2, Adjustment mechanism 3, Mounting frame 3a, Guide plate 4a, Guide channel 4b, Strip limiting block 5, Strip fixing hole 5a, First partition 6a, Second partition 6b, Third partition 6c, Fourth partition 6d, Fifth partition 6e, Sixth partition 6f, Seventh partition 6g, Eighth partition 6h, Adjusting screw 7a, Adjusting handle 7b, Opening groove 8, First nut block 9a, Second nut block 9b, Third nut block 9c, Fourth nut block 9d, First moving frame 10a, Second moving frame 10b, Third moving frame 10c, Fourth moving frame 10d, U-shaped opening groove 11, First positioning pin 12a, Second positioning pin 12b, Third positioning pin 12c, Fourth positioning pin 12d. Connecting plate 13, guide groove 13a, guide post 13b, first tinning channel 14a, second tinning channel 14b, third tinning channel 14c, fourth tinning channel 14d, baffle 15, pump 16. Implementation

[0033] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details.

[0034] See Figures 1 to 5 A tin-coating device for composite strip includes a tin-coating mold 2. L-shaped strip limiting blocks 5 are provided on the left and right sides of the tin-coating mold 2. Two strip-shaped fixing holes 5a are provided in the middle of the horizontal arm of the strip limiting block 5. Adjusting bolts move and fix the position of the strip limiting block 5 through the strip-shaped fixing holes 5a.

[0035] Multiple baffles for forming tin plating channels are provided between the two strip limiting blocks 5. The position of each baffle can be adjusted according to the number and width of the tin plating channels. The front and rear ends of the tin plating channels are respectively provided with guide plates 4a that are fixed to the mounting frame 3a by bolts. A guide groove 4b is provided in the guide plate 4a. One guide groove 4b is connected to the tin flow inlet 1a, and the other guide groove 4b is connected to the tin flow outlet 1b. The tin flow is made to flow by the pump 16.

[0036] The partitions include a first partition 6a, a second partition 6b, a third partition 6c, a fourth partition 6d, a fifth partition 6e, a sixth partition 6f, a seventh partition 6g, and an eighth partition 6h. The first partition 6a, the second partition 6b, the third partition 6c, and the fourth partition 6d each have a Z-shaped bend to the left at both ends, and the fifth partition 6e, the sixth partition 6f, the seventh partition 6g, and the eighth partition 6h each have a Z-shaped bend to the right at both ends. These bends communicate with the guide channel 4b. A first coating is formed between the first partition 6a and the second partition 6b. The solder flow channel 14a is formed between the corner of the second partition 6a and the third partition 6b, where the solder flow channel is closed and no solder flow channel is formed. The second solder flow channel 14b is formed between the third partition 6c and the fourth partition 6d. A baffle 15 is provided at the corner of the fourth partition 6a and the fifth partition 6b, where no solder flow channel is formed. The third solder flow channel 14c is formed between the fifth partition 6e and the sixth partition 6f. The corner of the sixth partition 6a and the seventh partition 6b is closed and no solder flow channel is formed. The fourth solder flow channel 14d is formed between the seventh partition 6g and the eighth partition 6h.

[0037] The tin-coating mold 2 is provided with adjustment mechanisms 3 for partitions on its left and right sides. The adjustment mechanism 3 includes an adjustment screw 7a, which is supported by a bearing on the mounting frame 3a and fixedly connected to an adjustment handle 7b by bolts. Multiple movable frames are threadedly connected to the adjustment screw 7a in sequence. The connecting arm of each movable frame is connected to a partition of an adjustable tin-coating channel. Each movable frame is provided with a U-shaped opening groove 11, and a nut block is fitted in the U-shaped opening groove 11 with a clearance. The lower end of the nut block is provided with a semi-circular opening groove 8. The inner wall of the opening groove 8 is threaded and threadedly engaged with the adjustment screw 7a. The nut block is locked by a positioning pin provided on the movable frame.

[0038] The lower end of the adjusting mechanism 3 is provided with a connecting plate 13. Both ends of the connecting plate 13 are provided with two strip-shaped guide grooves 13a. The lower end of each movable frame is provided with two downward-extending guide posts 13b. The guide posts 13b are inserted into the strip-shaped guide grooves 13a for sliding engagement, and the lower ends of the guide posts 13b are locked with nuts. Four fastening holes 5b are provided on both sides of the strip-shaped fixing hole 5a. The fastening holes 5b are used to fasten the position of the movable frame through locking bolts. The connecting arms of each movable frame slide in sequence to form circumferential limits. The outermost movable frame slides in with the mounting frame 3a to form a circumferential limit. Example 1:

[0039] See Figure 7 The composite strip is 25mm wide, and a 3.5mm wide tin layer is coated on both sides of the composite strip at a distance of 4.0mm from the left and right edges.

[0040] See Figures 1 to 5According to Example 1, the tinning mold 2 is adjusted at the position of the composite strip to be tinned. First, the L-shaped strip limiting blocks 5 set on the left and right sides of the tinning mold 2 are adjusted. By loosening the fixing bolts on the first strip fixing hole 5a, the distance between the strip limiting blocks 5 is adjusted to be the same as the width of the composite strip, and then tightened to fix the strip limiting blocks 5.

[0041] Remove the third positioning pin 12c and the fourth positioning pin 12d, allowing the third nut block 9c and the fourth nut block 9d to move downwards and engage with the adjusting screw 7a. Restore the third positioning pin 12c and the fourth positioning pin 12d, fixing the third nut block 9c and the fourth nut block 9d in relative contact with the adjusting screw 7a. Loosen the bolts at the lower ends of the third moving frame 10c and the fourth moving frame 10d, allowing the moving frames to move relative to each other. By rotating the adjusting handle 7b, push the third moving frame 10c and the fourth moving frame 10d, ensuring that the corresponding third partition plates 6c and the fourth partition plates 6d are fully engaged. Tighten the corresponding fastening bolts on the strip limiting block 5, and also tighten the bolts at the lower ends of the third moving frame 10c and the fourth moving frame 10d, fixing the third moving frame 10c and the fourth moving frame 10d. Remove the third locating pin 12c and the fourth locating pin 12d, causing the third nut block 9c and the fourth nut block 9d to move upwards and disengage from the adjusting screw 7a. Return the third locating pin 12c and the fourth locating pin 12d to their original positions, fixing the third nut block 9c and the fourth nut block 9d to remain relatively disconnected from the adjusting screw 7a. This operation closes the second soldering channel 14b, which is composed of the third partition 6c and the fourth partition 6d. Following the same procedure, close the third soldering channel 14c, which is composed of the fifth partition 6e and the sixth partition 6f. This leaves only the soldering channel corresponding to the number of solder strips of the composite strip to be soldered.

[0042] Remove the first positioning pin 12a and the second positioning pin 12b, allowing the first nut block 9a and the second nut block 9b to move downwards and engage with the adjusting screw 7a. Restore the first positioning pin 12a and the second positioning pin 12b, fixing the first nut block 9a and the second nut block 9b in relative contact with the adjusting screw 7a. Loosen the bolts at the lower ends of the first moving frame 10a and the second moving frame 10b, allowing the moving frames to move relative to each other. By rotating the adjusting handle 7b, push the first moving frame 10a and the second moving frame 10b, so that the first partition 6a corresponding to the first moving frame 10a is 4.0mm away from the adjacent strip limiting block 5, and the first partition 6a and the second partition 6b corresponding to the first moving frame 10a and the second moving frame 10b are 3.5mm apart. Tighten the corresponding fastening bolts on the strip limiting block 5, and also tighten the bolts at the lower ends of the first moving frame 10a and the second moving frame 10b, fixing the first moving frame 10a and the second moving frame 10b. Remove the first positioning pin 12a and the second positioning pin 12b, causing the first nut block 9a and the second nut block 9b to move upwards and disengage from the adjusting screw 7a. Return the first positioning pin 12a and the second positioning pin 12b to their original positions, fixing the first nut block 9a and the second nut block 9b to remain relatively disconnected from the adjusting screw 7a. This operation opens the first tinning channel 14a, composed of the first partition 6a and the second partition 6b. The width of the first tinning channel 14a is 3.5mm, and the distance between the first tinning channel 14a and the adjacent strip limiting block 5 is 4.0mm. Following the above operation, adjust the fourth tinning channel 14d, composed of the seventh partition 6g and the eighth partition 6h. The width of the fourth tinning channel 14d is 3.5mm, and the distance between the fourth tinning channel 14d and the adjacent strip limiting block 5 is 4.0mm. This ensures that the position and width of the retained tinning channel correspond to the position and width of the composite strip to be tinned. Example 2:

[0043] See Figure 8 The composite strip is 35mm wide. Both sides of the composite strip are coated with a 3.0mm wide tin layer at a distance of 2.5mm from the left and right edges. The middle of the composite strip is coated with a 6.0mm wide tin layer at a distance of 14.5mm from both the left and right edges.

[0044] See Figures 1 to 5 According to Example 2, the tinning mold 2 is adjusted at the position to be tinned on the composite strip. First, the L-shaped strip limiting blocks 5 on the left and right sides of the tinning mold 2 are adjusted. By loosening the fixing bolts on the first strip-shaped fixing hole 5a, the distance between the strip limiting blocks 5 is adjusted to be the same as the width of the composite strip, and then tightened to fix the strip limiting blocks 5.

[0045] Remove the third positioning pin 12c and the fourth positioning pin 12d, allowing the third nut block 9c and the fourth nut block 9d to move downwards and engage with the adjusting screw 7a. Restore the third positioning pin 12c and the fourth positioning pin 12d, fixing the third nut block 9c and the fourth nut block 9d in relative contact with the adjusting screw 7a. Loosen the bolts at the lower ends of the third moving frame 10c and the fourth moving frame 10d, allowing the moving frames to move relative to each other. By rotating the adjusting handle 7b, push the third moving frame 10c and the fourth moving frame 10d, ensuring that the corresponding third partition plates 6c and the fourth partition plates 6d are fully engaged. Tighten the corresponding fastening bolts on the strip limiting block 5, and also tighten the bolts at the lower ends of the third moving frame 10c and the fourth moving frame 10d, fixing the third moving frame 10c and the fourth moving frame 10d. Remove the third locating pin 12c and the fourth locating pin 12d, causing the third nut block 9c and the fourth nut block 9d to move upwards and disengage from the adjusting screw 7a. Then, restore the third locating pin 12c and the fourth locating pin 12d, fixing the third nut block 9c and the fourth nut block 9d to remain relatively disconnected from the adjusting screw 7a. This operation closes the second soldering channel 14b, which is composed of the third partition plate 6c and the fourth partition plate 6d. That is, only the soldering channel corresponding to the number of solder strips of the composite strip to be soldered remains.

[0046] Remove the first positioning pin 12a and the second positioning pin 12b, allowing the first nut block 9a and the second nut block 9b to move downwards and engage with the adjusting screw 7a. Restore the first positioning pin 12a and the second positioning pin 12b, fixing the first nut block 9a and the second nut block 9b in relative contact with the adjusting screw 7a. Loosen the bolts at the lower ends of the first moving frame 10a and the second moving frame 10b, allowing the moving frames to move relative to each other. By rotating the adjusting handle 7b, push the first moving frame 10a and the second moving frame 10b, so that the first partition 6a corresponding to the first moving frame 10a is 2.5mm away from the adjacent strip limiting block 5, and the first partition 6a and the second partition 6b corresponding to the first moving frame 10a and the second moving frame 10b are 3.0mm apart. Tighten the corresponding fastening bolts on the strip limiting block 5, and also tighten the bolts at the lower ends of the first moving frame 10a and the second moving frame 10b, fixing the first moving frame 10a and the second moving frame 10b. Remove the first positioning pin 12a and the second positioning pin 12b, causing the first nut block 9a and the second nut block 9b to move upwards and disengage from the adjusting screw 7a. Return the first positioning pin 12a and the second positioning pin 12b to their original positions, fixing the first nut block 9a and the second nut block 9b to remain relatively disconnected from the adjusting screw 7a. This operation opens the first soldering channel 14a, composed of the first partition 6a and the second partition 6b. The width of the first soldering channel 14a is 3.0 mm, and the distance between the first soldering channel 14a and the adjacent strip limiting block 5 is 2.5 mm. Following the above operation, adjust the fourth soldering channel 14d, composed of the seventh partition 6g and the eighth partition 6h. The width of the fourth soldering channel 14d is 3.0 mm, and the distance between the fourth soldering channel 14d and the adjacent strip limiting block 5 is 2.5 mm. Adjust the third soldering channel 14c, which is composed of the fifth partition 6e and the sixth partition 6f. The width of the third soldering channel 14c is 6.0mm, and the distance between the third soldering channel 14c and the strip limiting blocks 5 on the left and right sides is 14.5mm. That is, the position and width of the reserved soldering channel correspond to the position and width of the composite strip to be soldered.

[0047] See Figure 6 The above-described Examples 1 and 2 are selectively coated with a tin layer according to a tin coating method for composite strips, including the following steps:

[0048] 1) Surface treatment: At room temperature, the surface of the composite strip in Example 1 and Example 2 is cleaned with a lint-free cloth to keep the surface to be tinned clean; flux is added to the surface through the flux tank assembly to complete the surface pretreatment of the composite strip to be tinned.

[0049] 2) Tin coating: Under the protective atmosphere of nitrogen and argon, the composite strips to be tinned in Examples 1 and 2 are respectively placed on the surface of the tin coating device with the tin coating channel position and width adjusted above. The pump 16 of the tin coating device is turned on, and the molten tin flows from the tin inlet 1a into the tin coating channel of the tin coating mold 2. The direction of the tin flow is horizontal and opposite to the direction of the composite strip transmission.

[0050] 3) Cooling: The tin-coated composite strip is sequentially conveyed and cooled by guide rollers, and then connected to a winding device for winding to complete the tin coating process.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A tin-coating device for composite strips, characterized in that: The device includes a tin-coating mold (2) for coating a tin layer onto a composite strip. The tin-coating mold (2) has strip limiting blocks (5) on its left and right sides. A plurality of partitions for forming tin-coating channels are provided between the two strip limiting blocks (5). The partitions include a first partition (6a), a second partition (6b), a third partition (6c), a fourth partition (6d), a fifth partition (6e), a sixth partition (6f), a seventh partition (6g), and an eighth partition (6h). The first partition (6a), the second partition (6b), the third partition (6c), and the fourth partition (6d) are all provided with Z-shaped corners bent to the left at both ends. The fifth partition (6e), the sixth partition (6f), the seventh partition (6g), and the eighth partition (6h) are all provided with Z-shaped corners bent to the right at both ends. The position of each partition can be adjusted according to the number and width of the tin coating channel. The tin coating mold (2) is provided with partition adjustment mechanisms (3) on the left and right sides respectively. The adjustment mechanism (3) includes an adjustment screw (7a). The adjustment screw (7a) is supported by a bearing in the adjustment handle (7b) on the mounting frame (3a). Multiple movable frames are threaded on the adjustment screw (7a) in sequence. The connecting arm of each movable frame is connected to a partition. Each movable frame is provided with a U-shaped opening groove (11). A nut block is inserted into the U-shaped opening groove (11). The lower end of the nut block is provided with a semi-circular opening groove (8). The inner wall of the opening groove (8) is threaded and threaded with the adjustment screw (7a). The nut block is locked by a positioning pin provided on the movable frame. The connecting arm of each movable frame slides to form a circumferential limit. The outermost movable frame slides to form a circumferential limit with the mounting frame (3a).

2. The tin-coating apparatus for composite strips according to claim 1, characterized in that: The strip limiting block (5) is adjustable in position. The cross section of the strip limiting block (5) is L-shaped. Two strip-shaped fixing holes (5a) are provided in the middle of the horizontal arm of the strip limiting block (5). Four fastening holes (5b) are provided on both sides of the strip-shaped fixing holes (5a). The position of the strip limiting block (5) is adjusted by adjusting bolts through the strip-shaped fixing holes (5a). The position of the moving frame is fastened by locking bolts through the fastening holes (5b).

3. The tin-coating apparatus for composite strips according to claim 1, characterized in that: The front and rear ends of the tin coating channel are respectively provided with guide plates (4a), and the guide plates (4a) are provided with guide grooves (4b). One guide groove (4b) is connected to the tin flow inlet (1a), and the other guide groove (4b) is connected to the tin flow outlet (1b).

4. The tin-coating apparatus for composite strips according to claim 1, characterized in that: A first soldering channel (14a) is formed between the first partition (6a) and the second partition (6b). The corner of the second partition (6b) and the third partition (6c) is closed and does not form a soldering channel. A second soldering channel (14b) is formed between the third partition (6c) and the fourth partition (6d). A baffle (15) is provided at the corner of the fourth partition (6d) and the fifth partition (6e), and no soldering channel is formed. A third soldering channel (14c) is formed between the fifth partition (6e) and the sixth partition (6f). The corner of the sixth partition (6f) and the seventh partition (6g) is closed and does not form a soldering channel. A fourth soldering channel (14d) is formed between the seventh partition (6g) and the eighth partition (6h).

5. The tin-coating apparatus for composite strips according to claim 1, characterized in that: The lower end of the adjustment mechanism (3) is provided with a connecting plate (13). Both ends of the connecting plate (13) are provided with two strip guide grooves (13a). The lower end of each movable frame is provided with two downwardly extending guide posts (13b). The guide posts (13b) are inserted into the strip guide grooves (13a) for sliding cooperation. The lower end of the guide posts (13b) is locked with a nut.

6. The tin-coating apparatus for composite strips according to claim 1 or 3, characterized in that: The adjusting handle (7b) and the guide plate (4a) are both fixedly connected to the mounting frame (3a) by bolts.

7. A method for tin-coating composite strips using the apparatus as described in claim 1, characterized in that, Includes the following steps: 1) Surface treatment: After cleaning the surface of the composite strip with a lint-free cloth, apply flux; 2) Tin coating: Under a protective atmosphere, the composite strip is rapidly tinned by contacting the tin flow through a tin coating device; 3) Cooling: The composite strip obtained after tin coating is conveyed by guide rollers and cooled online.

8. The method according to claim 7, characterized in that: Step 2) The protective atmosphere is nitrogen or argon.

9. The method according to claim 8, characterized in that: Step 2) The direction of the tin flow is horizontally opposite to the direction of the composite strip drive.

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