Tin spraying device and tin spraying method for long circuit board

Abstract

The invention discloses a tin spraying device and a tin spraying method for a long circuit board, the tin spraying device for the long circuit board comprises a tin spraying box and an air knife box, the tin spraying box is provided with a plurality of tin spraying pipes for spraying tin to the long circuit board, the air knife box is provided with an air knife pipe for blowing and cleaning the long circuit board after tin spraying, and the air knife box is provided with a plurality of tin spraying pipes for spraying tin to the long circuit board. The tin spraying pipes and the air knife pipes are vertically arranged downwards; the tin spraying method of the tin spraying device for the long circuit board comprises the following steps: S1, clamping; s2, spraying tin; s3, air knife cleaning; and 4, resetting and blanking. When the conveying assembly conveys the long circuit board into the tin spraying box for tin spraying operation, the adjusting mechanism enables the surface of the long circuit board to face upwards so as to facilitate tin spraying, when the long circuit board enters the air knife box for blowing cleaning, the adjusting mechanism enables the long circuit board to gradually deflect downwards, in this way, the gravity is used for assisting in downward flowing of tin liquid, and the tin spraying efficiency is improved. And part of the tin liquid remaining in the concave area can be thoroughly cleaned.

Description

Technical Field

[0001] The present invention relates to the technical field of spraying tin on long circuit boards, and particularly to a tin spraying device and a tin spraying method for long circuit boards. Background Art

[0002] In the production process of circuit boards, tin spraying is an important step. Its purpose is to evenly cover a layer of tin on the solder pads of the circuit board to improve the solderability and electrical performance of the circuit board. After the surface of the circuit board adheres enough tin / tin-lead, the excess tin / tin-lead is scraped off by using hot air pressure.

[0003] For example, a circuit board tin spraying device and process disclosed in the patent publication number CN116095966B. In this technical solution, the circuit board is always moved horizontally back and forth by a magnetic levitation component, and tin spraying and air knife cleaning are carried out. When the circuit board reaches the air knife cleaning area, only the airflow blowing horizontally acts on the air knife. This results in that part of the tin liquid on the surface of the circuit board completely depends on the blowing action of the airflow, and part of the tin liquid in the concave area of the circuit board will be blocked by the surrounding and cannot be blown out, thus leading to incomplete cleaning of the tin liquid. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies existing in the prior art, and a tin spraying device and a tin spraying method for long circuit boards are proposed.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A tin spraying device for long circuit boards includes a tin spraying box and an air knife box. A plurality of tin spraying pipes for spraying tin on the long circuit board are installed on the tin spraying box, and air knife pipes for spraying and cleaning the long circuit board after tin spraying are installed on the air knife box. Each of the tin spraying pipes and the air knife pipes is vertically downward;

[0007] A conveying component for conveying the long circuit board is installed in the tin spraying box. The conveying component includes a reciprocating lead screw, a guide rod, a lead screw nut, a guide slider, a first bracket, and a second bracket. Fixing mechanisms are provided on the opposite sides of the lead screw nut and the guide slider, and the fixing mechanisms are used for clamping and fixing the long circuit board. A servo motor is fixedly installed on the side wall of the air knife box, and the output shaft of the servo motor is fixedly connected to the reciprocating lead screw;

[0008] Adjusting mechanisms for adjusting the angle of the long circuit board are provided on each of the fixing mechanisms. The adjusting mechanisms include an adjusting box, a rotating shaft, an adjusting gear, an adjusting rack, and a driving mechanism. The adjusting rack and the adjusting gear are both arranged in the adjusting box, and the adjusting gear and the adjusting rack are meshed with each other. The rotating shaft extends into the adjusting box and is fixed at the center position of the adjusting gear. The driving mechanism is used for driving the adjusting rack to move.

[0009] Preferably, both the first bracket and the second bracket are fixed on the side wall of the solder spraying box, wherein the guide rod is fixed on the side wall of the first bracket, the reciprocating lead screw is rotatably arranged on the side wall of the second bracket, the guide slider slidably penetrates through the guide rod, and the lead screw nut and the reciprocating lead screw form a lead screw pair.

[0010] Preferably, the driving mechanism includes a driving gear and a driving screw. The driving screw is rotatably arranged in the adjusting box and is threadedly connected with the adjusting rack. The driving gear is fixed at the upper end of the driving screw, and a driving toothed plate is fixedly connected to the inner wall of the air knife box.

[0011] Preferably, the fixing mechanism includes a fixing plate, a movable plate, a lifting screw and a lifting gear. The lifting screw is rotatably arranged at the upper end of the fixing plate. The lifting screw is threadedly connected with the movable plate. The lifting gear is fixed at the upper end of the lifting screw. A suspension rod is fixedly connected to the top inside the solder spraying box. The lower end of the suspension rod is fixedly connected with a locking rack. The rotating shaft is fixedly connected with the adjacent fixing plate.

[0012] Preferably, both the guide slider and the lead screw nut are rotatably connected to the adjacent rotating shaft. An angle sensor is arranged on the guide slider. An electromagnetic control valve is installed in the air knife tube. The angle sensor is used to detect the rotation angle of the rotating shaft, and the electromagnetic control valve controls the air flow velocity in the air knife tube according to the angle value detected by the angle sensor.

[0013] Preferably, a limiting rod is fixedly connected inside the adjusting box, and the limiting rod slidably penetrates through the adjusting rack.

[0014] Preferably, two limiting columns are fixedly connected to the upper end of the fixing plate, and both limiting columns slidably penetrate through the movable plate.

[0015] The present invention also discloses a solder spraying method for a solder spraying device of a long circuit board, including the following steps:

[0016] S1. Clamping: Insert the long circuit board between the fixing plate and the movable plate, start the servo motor, the conveying component can be operated to drive the long circuit board to move forward. During the forward movement, the fixing mechanism can automatically operate to clamp the long circuit board.

[0017] S2. Solder spraying: The conveying component drives the fixed long circuit board into the solder spraying box. At this time, the servo motor is turned off for a period of time. The tin liquid discharge pipe of the solder spraying device can be connected to the solder spraying pipe, and the long circuit board can be subjected to solder spraying treatment through the solder spraying pipe.

[0018] S3. Air knife cleaning: Start the servo motor again and operate the conveying component, the long circuit board after solder spraying treatment can be transported into the air knife box, and hot air flow can be conveyed to the air knife tube through a hot air blower to blow and clean the tin liquid on the surface of the long circuit board.

[0019] S4. Reset and unload. Continue to start the servo motor. The conveying component can drive the long circuit board that has been sprayed with tin and cleaned to move back. At this time, the fixing mechanism can loosen itself, and the user can remove the long circuit board.

[0020] The present invention has the following beneficial effects:

[0021] 1. By setting a fixing mechanism that can adjust the long circuit board, when the conveying component transports the long circuit board into the tin spraying box for tin spraying operation, the adjusting mechanism turns the surface of the long circuit board upward to facilitate tin spraying. When the long circuit board enters the air knife box for blowing and cleaning, the adjusting mechanism gradually deflects the long circuit board downward. In this way, the gravity is used to assist the tin liquid to flow downward, so that part of the tin liquid remaining in the concave area can be cleaned thoroughly.

[0022] 2. By setting an angle sensor to detect the rotation angle of the rotating shaft, the deflection angle of the long circuit board can be judged. At the same time, the electromagnetic control valve controls the air flow velocity of the air knife tube according to the deflection angle of the long circuit board. In this way, when the downward deflection angle of the long circuit board is small and the windward area is large, the air flow velocity can be reduced, and when the downward deflection angle of the long circuit board is large and the windward area is small, the air flow velocity can be increased. In this way, not only can the blowing and cleaning effect be guaranteed, but also the action of the wind force on the long circuit board can be limited to avoid damaging the long circuit board.

[0023] 3. By setting an adjusting mechanism composed of components such as an adjusting gear, an adjusting rack and a driving mechanism, it can automatically adjust the long circuit board to the corresponding angle as the conveying component transports the long circuit board to the corresponding area. This seamless collaborative working method greatly improves the continuity and smoothness of the production line.

[0024] 4. By setting components such as a lifting screw and a lifting gear, after the long circuit board is inserted between the fixed plate and the movable plate, when the conveying component moves forward by itself, the fixing mechanism can be automatically started to clamp the long circuit board. When the conveying component drives the processed long circuit board to move back, the fixing mechanism can automatically loosen the long circuit board. In this way, the long circuit board is automatically clamped and unloaded according to the working progress, which can further improve the overall processing efficiency. Description of the Drawings

[0025] Figure 1 It is a front structural schematic diagram of a tin spraying device for a long circuit board proposed by the present invention;

[0026] Figure 2 It is a back structural schematic diagram of a tin spraying device for a long circuit board proposed by the present invention;

[0027] Figure 3 It is an internal sectional structural schematic diagram of a tin spraying device for a long circuit board proposed by the present invention;

[0028] Figure 4 For Figure 3 the enlarged schematic view of the structure at position A in

[0029] Figure 5 the schematic view of the structure of the fixing mechanism for clamping a long circuit board in the present invention;

[0030] Figure 6 the schematic view of the structure of the reciprocating lead screw and the adjustment mechanism on one side of the lead screw nut in the present invention;

[0031] Figure 7 the schematic view of the internal sectional structure of the air knife box in the present invention;

[0032] Figure 8 the schematic view of the internal sectional structure of the solder spraying box in the present invention.

[0033] In the figure: 1 solder spraying box, 2 air knife box, 3 air knife tube, 4 solder spraying tube, 5 first bracket, 6 second bracket, 7 guide rod, 8 reciprocating lead screw, 9 servo motor, 10 long circuit board, 11 fixing plate, 12 movable plate, 13 guide slider, 14 angle sensor, 15 adjustment box, 16 limit post, 17 lifting screw rod, 18 lifting gear, 19 driving gear, 20 driving screw rod, 21 lead screw nut, 22 rotating shaft, 23 limit rod, 24 adjustment gear, 25 adjustment rack, 26 driving toothed plate, 27 locking rack, 28 suspension rod. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0035] Embodiment 1:

[0036] Referring to Figure 1 , a solder spraying device for a long circuit board includes a solder spraying box 1 and an air knife box 2. A plurality of solder spraying tubes 4 for spraying solder onto the long circuit board 10 are installed on the solder spraying box 1, and an air knife tube 3 for blowing and cleaning the long circuit board 10 after solder spraying is installed on the air knife box 2. Each solder spraying tube 4 and air knife tube 3 are vertically downward;

[0037] Inside the tin spraying box 1, a conveying assembly for conveying the long circuit board 10 is installed. The conveying assembly includes a reciprocating lead screw 8, a guide rod 7, a lead screw nut 21, a guide slider 13, a first bracket 5, and a second bracket 6. Fixed mechanisms are provided on the opposite sides of the lead screw nut 21 and the guide slider 13. The fixed mechanisms are used to clamp and fix the long circuit board 10. A servo motor 9 is fixedly installed on the side wall of the air knife box 2, and the output shaft of the servo motor 9 is fixedly connected to the reciprocating lead screw 8; both the first bracket 5 and the second bracket 6 are fixed on the side wall of the tin spraying box 1. Among them, the guide rod 7 is fixed on the side wall of the first bracket 5, the reciprocating lead screw 8 is rotatably arranged on the side wall of the second bracket 6, the guide slider 13 slidably penetrates the guide rod 7, and the lead screw nut 21 and the reciprocating lead screw 8 form a lead screw pair.

[0038] An adjusting mechanism for adjusting the angle of the long circuit board 10 is provided on each fixed mechanism.

[0039] In this embodiment, after the long circuit board 10 is fixed between the lead screw nut 21 and the guide slider 13 by the fixed mechanism, the servo motor 9 is started, which can drive the reciprocating lead screw 8 to rotate. In this way, the lead screw nut 21 can be moved horizontally, so that the conveying assembly can convey the fixed long circuit board 10 into the tin spraying box 1 for tin spraying treatment. During the tin spraying treatment, the servo motor 9 can be turned off to stop the conveying assembly from moving to facilitate the tin spraying operation. After the tin spraying treatment is completed, the servo motor 9 is started again to drive the conveying assembly to operate, and the long circuit board 10 can be conveyed into the air knife box 2.

[0040] When the long circuit board 10 enters the air knife box 2, the adjusting mechanism on the fixed mechanism will drive the long circuit board 10 to gradually deflect downward to the vertical state. At this time, the hot air flow conveyed by equipment such as a hot air blower can be introduced into the air knife pipe 3 on the upper side of the air knife box 2 to blow and clean the tin liquid on the surface of the long circuit board 10. In this way, with the assistance of gravity, the tin liquid on the surface of the long circuit board 10 can be made to flow downward, so that part of the tin liquid remaining in the concave area can be cleaned thoroughly.

[0041] Embodiment 2

[0042] Compared with the embodiment, this embodiment also has the following further content:

[0043] Refer to Figure 6 , the adjusting mechanism includes an adjusting box 15, a rotating shaft 22, an adjusting gear 24, an adjusting rack 25 and a driving mechanism. The adjusting rack 25 and the adjusting gear 24 are both arranged in the adjusting box 15, and the adjusting gear 24 and the adjusting rack 25 are meshed with each other. The rotating shaft 22 extends into the adjusting box 15 and is fixed at the center position of the adjusting gear 24. The driving mechanism is used to drive the adjusting rack 25 to move.

[0044] The driving mechanism includes a driving gear 19 and a driving screw 20. The driving screw 20 is rotatably arranged in the adjusting box 15 and is threadedly connected to the adjusting rack 25. The driving gear 19 is fixed to the upper end of the driving screw 20. A driving tooth plate 26 is fixedly connected to the inner wall of the air knife box 2. Specifically, the driving tooth plate 26 corresponds to the driving gear 19, and when the two come into contact, the driving tooth plate 26 can cause the driving gear 19 to rotate.

[0045] Referring to Figure 5 , the fixing mechanism includes a fixing plate 11, a movable plate 12, a lifting screw 17 and a lifting gear 18. The lifting screw 17 is rotatably arranged at the upper end of the fixing plate 11. The lifting screw 17 is threadedly connected to the movable plate 12. The lifting gear 18 is fixed to the upper end of the lifting screw 17. A suspension rod 28 is fixedly connected to the inner top of the solder spraying box 1. The lower end of the suspension rod 28 is fixedly connected to a locking rack 27. The rotating shaft 22 is fixedly connected to the adjacent fixing plate 11. Specifically, the locking rack 27 corresponds to the lifting gear 18, and when the two come into contact, the locking rack 27 can force the lifting gear 18 to rotate.

[0046] A limiting rod 23 is fixedly connected inside the adjusting box 15, and the limiting rod 23 slidably penetrates through the adjusting rack 25. By providing the limiting rod 23, the adjusting rack 25 can be limited to move only vertically up and down, so that when the driving screw 20 rotates, the adjusting rack 25 can only move vertically under the action of the thread. At the same time, the thread action between the driving screw 20 and the adjusting rack 25 can be utilized to ensure that the angle of the rotating shaft 22 remains stable.

[0047] Two limiting columns 16 are fixedly connected to the upper end of the fixing plate 11, and both of the two limiting columns 16 slidably penetrate through the movable plate 12. By providing the limiting columns 16, it can not only ensure the stable up and down movement of the movable plate 12, but also limit the movable plate 12. When the lifting screw 17 rotates, the movable plate 12 can only move vertically up and down under the action of the thread transmission.

[0048] The guiding slider 13 and the lead screw nut 21 are both rotatably connected to the adjacent rotating shaft 22. Specifically, referring to Figure 5 , the left rotating shaft 22 is rotatably connected to the guiding slider 13, and the right rotating shaft 22 is rotatably connected to the lead screw nut 21.

[0049] In this embodiment, referring to Figure 5 , when clamping the long circuit board 10, the long circuit board 10 can be inserted between the fixing plate 11 and the movable plate 12. At this time, the fixing plate 11 and the movable plate 12 can hold the long circuit board 10, but do not clamp the long circuit board 10, which can prevent the long circuit board 10 from falling when the conveying component starts to convey the long circuit board 10.

[0050] Referring to Figure 3 , Figure 4, after the long circuit board 10 actively moves into the solder spraying tank 1, the lifting gear 18 above the movable plate 12 will come into contact with and mesh with the locking rack 27 in the solder spraying tank 1 (see the attached Figure 8 ). Then, as the long circuit board 10 continues to move, the lifting gear 18 will start to rotate under the action of the locking rack 27. The lifting gear 18 can drive the lifting screw 17 below it to rotate together. In this way, the movable plate 12 can be moved towards the fixed plate 11 until the lifting gear 18 leaves the locking rack 27, and the movable plate 12 can just clamp the long circuit board 10. Subsequently, the conveying component will drive the clamped long circuit board 10 to move below the solder spraying pipe 4 for solder spraying operation.

[0051] When the long circuit board 10 is processed and the reciprocating lead screw 8 rotates to move the lead screw nut 21 back, when the conveying component drives the processed long circuit board 10 to move back, the lifting gear 18 will pass by the locking rack 27 again and mesh with it again. At this time, the locking rack 27 can make the lifting gear 18 rotate in the reverse direction, which will also drive the lifting screw 17 to rotate in the reverse direction, so that the movable plate 12 moves away from the fixed plate 11, and the long circuit board 10 can be gradually loosened, and the user can easily remove the processed long circuit board 10. In this way, automatically clamping and unloading the long circuit board 10 according to the working progress can effectively improve the overall processing efficiency.

[0052] Furthermore, when the conveying component drives the clamped long circuit board 10 into the air knife box 2, refer to Figure 4 、 Figure 5 、 Figure 6 and Figure 7 , the driving gear 19 above the adjusting box 15 will come into contact with and mesh with the driving rack 26 in the air knife box 2. Then, the driving gear 19 will start to rotate under the action of the driving rack 26. The driving gear 19 will drive the driving screw 20 to rotate, and the adjusting rack 25 will move downward, which can drive the adjusting gear 24 to rotate. The adjusting gear 24 can drive the rotating shaft 22 to rotate. Since the rotating shaft 22 is fixedly connected to the fixed plate 11, when the rotating shaft 22 rotates, it can drive the fixed plate 11 to rotate together. In this way, the long circuit board 10 clamped and fixed between the fixed plate 11 and the movable plate 12 can be deflected downward together, and the long circuit board 10 is forced to gradually deflect from the horizontal state to the vertical state.

[0053] Subsequently, the conveying component stops driving the long circuit board 10 to move, and a hot air flow is introduced into the air knife pipe 3 through equipment such as a hot air blower and blown towards the long circuit board 10 deflected to the vertical state, which can blow off the tin liquid on the surface of the long circuit board 10. At the same time, with the auxiliary action of gravity, the tin liquid in some sunken areas of the long circuit board 10 can also flow downward naturally. In this way, it can ensure that the tin liquid on the surface of the long circuit board 10 is effectively blown and cleaned.

[0054] When the blowing is completed and the conveying assembly drives the long circuit board 10 to move back, the driving tooth plate 26 will force the driving gear 19 to rotate in the reverse direction. As a result, the driving screw 20 will also be driven to rotate in the reverse direction, and the adjusting rack 25 will be moved upward. In this way, the adjusting gear 24 and the rotating shaft 22 will be driven to rotate in the reverse direction, and the fixing plate 11 and the long circuit board 10 fixed thereon will be gradually deflected upward to the horizontal state, which facilitates the removal of the long circuit board 10 after complete back-movement and the re-clamping of a new long circuit board 10.

[0055] In this embodiment, by providing an adjustment mechanism composed of components such as the adjusting gear 24, the adjusting rack 25, and the driving mechanism, the long circuit board 10 can be automatically adjusted to the corresponding angle as the conveying assembly transports the long circuit board 10 to the corresponding area. This seamless collaborative working method greatly improves the continuity and smoothness of the production line.

[0056] Embodiment III

[0057] Compared with Embodiment II, this embodiment also has the following further content:

[0058] An angle sensor 14 is provided on the guiding slider 13, and an electromagnetic control valve is installed in the air knife tube 3. The angle sensor 14 is used to detect the rotation angle of the rotating shaft 22, and the electromagnetic control valve controls the air flow velocity in the air knife tube 3 according to the angle value detected by the angle sensor 14. It should be noted that the electromagnetic control valve gradually opens only when the rotating shaft 22 starts to rotate clockwise (the reference direction of the rotation of the rotating shaft 22 is Figure 6 the state shown), that is, when the rotating shaft 22 starts to drive the fixing plate 11 and the long circuit board 10 to gradually deflect downward, the electromagnetic control valve gradually opens, and when the conveying assembly drives the long circuit board 10 to move back and the long circuit board 10 gradually deflects upward, the electromagnetic control valve is always closed.

[0059] In this embodiment, according to Embodiment II, when the rotating shaft 22 drives the fixing plate 11 and the long circuit board 10 fixed thereon to gradually deflect downward to the vertical state, the angle sensor 14 real-time detects the rotation angle of the rotating shaft 22, and the electromagnetic control valve gradually opens according to the received detection signal and controls the air flow velocity discharged from the air knife tube 3. Specifically, when the long circuit board 10 deflects downward at a small angle and has a large windward area, the air flow velocity is reduced, and when the long circuit board 10 deflects downward at a large angle and has a small windward area, the air flow velocity is increased. In this way, both the blowing and cleaning effect can be ensured, and at the same time, the force on the long circuit board 10 by the wind can be limited to avoid damage to the long circuit board 10.

[0060] In addition, the present invention also proposes a soldering tin method for the above-mentioned soldering tin device for a long circuit board, including the following steps:

[0061] S1. Clamping: Insert the long circuit board 10 between the fixed plate 11 and the movable plate 12. Start the servo motor 9, which can make the conveying component operate and drive the long circuit board 10 to move forward. During the forward movement, the fixing mechanism automatically operates to clamp the long circuit board 10.

[0062] S2. Tin spraying: The conveying component drives the fixed long circuit board 10 into the tin spraying box 1. At this time, the servo motor 9 is turned off for a period of time. Connect the tin liquid discharge pipe of the tin spraying device to the tin spraying pipe 4, and tin spraying treatment can be carried out on the surface of the long circuit board 10 through the tin spraying pipe 4.

[0063] S3. Air knife cleaning: Start the servo motor 9 again and make the conveying component operate, which can transport the long circuit board 10 after tin spraying treatment into the air knife box 2. Hot air can be conveyed to the air knife pipe 3 through the hot air blower to blow and clean the tin liquid on the surface of the long circuit board 10.

[0064] S4. Resetting and blanking: Continue to start the servo motor 9, which can drive the long circuit board 10 that has completed tin spraying and cleaning to move back through the conveying component. At this time, the fixing mechanism can loosen itself, and the user can remove the long circuit board 10.

[0065] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A tin spraying device for a long circuit board, comprising a tin spraying box (1) and an air knife box (2), characterized in that, A plurality of solder spraying pipes (4) for spraying solder onto the long circuit board (10) are installed on the solder spraying box (1). A blower pipe (3) for blowing and cleaning the long circuit board (10) after solder spraying is installed on the air knife box (2). Each of the solder spraying pipes (4) and the blower pipes (3) is arranged vertically downward; A conveying assembly for conveying the long circuit board (10) is installed in the solder spraying box (1). The conveying assembly includes a reciprocating lead screw (8), a guide rod (7), a lead screw nut (21), a guide slider (13), a first bracket (5), and a second bracket (6). Fixing mechanisms are provided on the opposite sides of the lead screw nut (21) and the guide slider (13). The fixing mechanisms are used for clamping and fixing the long circuit board (10). A servo motor (9) is fixedly installed on the side wall of the air knife box (2). The output shaft of the servo motor (9) is fixedly connected to the reciprocating lead screw (8); An adjusting mechanism for adjusting the angle of the long circuit board (10) is provided on each of the fixing mechanisms. The adjusting mechanism includes an adjusting box (15), a rotating shaft (22), an adjusting gear (24), an adjusting rack (25), and a driving mechanism. The adjusting rack (25) and the adjusting gear (24) are both arranged in the adjusting box (15), and the adjusting gear (24) and the adjusting rack (25) are meshed with each other. The rotating shaft (22) extends into the adjusting box (15) and is fixed at the axial center position of the adjusting gear (24). The driving mechanism is used for driving the adjusting rack (25) to move.

2. The spraying tin device for a long circuit board according to claim 1, wherein The first bracket (5) and the second bracket (6) are both fixed on the side wall of the solder spraying box (1). The guide rod (7) is fixed on the side wall of the first bracket (5). The reciprocating lead screw (8) is rotatably arranged on the side wall of the second bracket (6). The guide slider (13) slidably penetrates through the guide rod (7). The lead screw nut (21) and the reciprocating lead screw (8) form a lead screw pair.

3. The spray tin device for a long circuit board according to claim 1, characterized in that, The driving mechanism includes a driving gear (19) and a driving screw (20). The driving screw (20) is rotatably arranged in the adjusting box (15) and is threadedly connected to the adjusting rack (25). The driving gear (19) is fixed at the upper end of the driving screw (20). A driving toothed plate (26) is fixedly connected to the inner wall of the air knife box (2).

4. A solder spraying device for a long circuit board according to claim 1, characterized in that, The fixing mechanism includes a fixing plate (11), a movable plate (12), a lifting screw (17), and a lifting gear (18). The lifting screw (17) is rotatably arranged at the upper end of the fixing plate (11). The lifting screw (17) is threadedly connected to the movable plate (12). The lifting gear (18) is fixed at the upper end of the lifting screw (17). A suspension rod (28) is fixedly connected to the inner top of the solder spraying box (1). A locking rack (27) is fixedly connected to the lower end of the suspension rod (28). The rotating shaft (22) is fixedly connected to the adjacent fixing plate (11).

5. A solder spraying device for a long circuit board according to claim 1, characterized in that, The guiding slider (13) and the lead screw nut (21) are both rotatably connected to the adjacent rotating shaft (22). An angle sensor (14) is provided on the guiding slider (13). An electromagnetic control valve is installed in the air knife tube (3). The angle sensor (14) is used to detect the rotation angle of the rotating shaft (22), and the electromagnetic control valve controls the air flow velocity in the air knife tube (3) according to the angle value detected by the angle sensor (14).

6. The spray tin device for a long circuit board according to claim 1, characterized in that, A limiting rod (23) is fixedly connected inside the adjusting box (15), and the limiting rod (23) slidably penetrates through the adjusting rack (25).

7. The spraying tin device for a long circuit board according to claim 4, characterized in that, Two limiting columns (16) are fixedly connected to the upper end of the fixed plate (11), and both of the two limiting columns (16) slidably penetrate through the movable plate (12).

8. The spraying method of a spraying tin device for a long circuit board according to any one of claims 1-7, characterized in that, It includes the following steps: S1. Clamping: Insert the long circuit board (10) between the fixed plate (11) and the movable plate (12). Start the servo motor (9), which can make the conveying component operate and drive the long circuit board (10) to move forward. During the forward movement, the fixing mechanism automatically operates to clamp the long circuit board (10). S2. Tin spraying: The conveying component drives the fixed long circuit board (10) into the tin spraying box (1). At this time, the servo motor (9) is turned off for a period of time. Connect the tin liquid discharge pipe of the tin spraying device to the tin spraying pipe (4), and tin spraying treatment can be carried out on the surface of the long circuit board (10) through the tin spraying pipe (4). S3. Air knife cleaning: Start the servo motor (9) again and make the conveying component operate, which can transport the long circuit board (10) after tin spraying treatment into the air knife box (2). Hot air can be conveyed to the air knife tube (3) through a hot air blower to blow and clean the tin liquid on the surface of the long circuit board (10). S4. Resetting and blanking: Continue to start the servo motor (9), which can drive the long circuit board (10) that has been sprayed with tin and cleaned to move back through the conveying component. At this time, the fixing mechanism can loosen itself, and the user can take down the long circuit board (10).

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