Electrotinning process for tinned sheet

Abstract

The invention discloses an electrotinning process for a tin-plated thin plate, which belongs to the technical field of electroplating devices and comprises the following steps: carrying out acid pickling work on a thin plate workpiece on a first group of hangers by utilizing rotation of a turntable, and clamping a second group of hangers onto a moving plate at the same time; washing the first group of sheet workpieces with water, and pickling the second group of sheet workpieces with acid; electroplating the sheet workpieces in the first group, washing the sheet workpieces in the second group, and pickling the sheet workpieces in the third group; when a tinned thin plate is subjected to the tinning process, the rotating disc rotates to drive the multiple sets of hanging tools to rotate at the same time, workpieces on the multiple sets of hanging tools can be subjected to the procedures of acid pickling, water washing, electroplating and the like, the working efficiency is improved, and when the procedures of acid pickling, water washing, electroplating and the like are carried out, the hanging tools can be continuously subjected to the feeding procedure; and efficient utilization of waiting time is realized by utilizing process time overlapping.

Description

Technical Field

[0001] This invention belongs to the field of electroplating equipment technology, and relates to an electroplating process, specifically an electroplating tin process for tin-plated thin plates. Background Technology

[0002] Irregularly shaped tin-plated sheets, with their flexible and versatile structural forms, are widely used in various fields such as food packaging containers and hardware accessories. Electroplating tin onto their surface is a key process for improving the product's corrosion resistance, conductivity, and compatibility with subsequent processing.

[0003] In existing technologies, the electroplating of tin-plated sheets often adopts a single-set rack-based step-by-step operation mode. The rack needs to carry the workpiece to complete pickling, water washing, electroplating and other processes in sequence. There are significant waiting intervals between each process, making it impossible to achieve parallel processing of multiple sets of racks, and production efficiency is difficult to improve. The racks in the electroplating tank are mostly rotating. This movement causes the workpiece to shake due to centrifugal force, resulting in inconsistent contact time and current distribution between the workpiece and the plating solution. At the same time, the rotation and movement will cause irregular eddies and dead zones in the plating solution, which will destroy the uniformity of the composition, temperature and metal ion concentration of the plating solution, and ultimately cause quality problems such as uneven plating thickness and surface micro-defects.

[0004] Patent CN222557121U discloses a high-efficiency electroplating device for tin cans. By setting up gears, Z-blocks, racks, a first fixed rod, a second fixed rod, and a container, a servo motor drives the gears to make circular motion. When the gears rotate clockwise, they drive the two racks that are meshed with them to move towards each other, which makes it easier for two workers to put the tin cans into the two containers at the same time, shortening the time required to place the tin cans and making the electroplating of tin cans more efficient.

[0005] However, the patent has the following drawbacks: the electroplating device can only perform electroplating on tin cans, the waiting interval between each process is long, it cannot achieve parallel processing of multiple sets of fixtures, the production efficiency is low, and when electroplating a batch of tin cans, it is necessary to wait for the electroplating of the first batch of workpieces to be completed before the next batch of workpieces can be electroplated, resulting in low electroplating efficiency. Summary of the Invention

[0006] The purpose of this invention is to solve the problems of low production efficiency caused by the use of single-set racks for tin plating of thin tin-plated sheets in existing processes, which involve long waiting intervals between each step and cannot achieve parallel processing of multiple sets of racks; as well as the rotation and movement of the racks in the electroplating tank, which causes the workpiece to shake due to centrifugal force, resulting in inconsistent contact time and current distribution of the plating solution; at the same time, the rotation causes irregular eddies and dead zones in the plating solution, which easily leads to uneven plating thickness and surface micro-defects. The invention provides a tin plating process for thin tin-plated sheets.

[0007] The objective of this invention can be achieved through the following technical solutions: An electroplating tin process for tin-plated thin sheets includes the following steps: S1: The first motor drives the turntable to rotate 90 degrees clockwise, transferring the thin plate workpiece on the first set of fixtures from the operating area to the pickling area; the electric push rod drives the moving plate to descend, and pickling is performed on the thin plate workpiece on the fixture; at the same time, the second set of fixtures is clamped onto the moving plate in the operating area. S2: Drive the turntable to rotate 90 degrees clockwise again, transferring the thin plate workpieces on the first set of fixtures from the pickling area to the washing area; at this time, the thin plate workpieces on the second set of fixtures are transferred from the operating area to the pickling area; drive the moving plate to descend again, performing washing on the thin plate workpieces on the first set of fixtures and pickling on the thin plate workpieces on the second set of fixtures; at the same time, engage the third set of fixtures onto the moving plate in the operating area; S3: Next, drive the turntable to rotate 90 degrees clockwise, transferring the thin sheet workpieces on the first set of fixtures from the washing area to the electroplating area; at this time, the thin sheet workpieces on the second set of fixtures are transferred from the pickling area to the washing area, and the thin sheet workpieces on the third set of fixtures are transferred from the operating area to the pickling area; drive the moving plate to descend again, performing electroplating on the thin sheet workpieces on the first set of fixtures, washing on the thin sheet workpieces on the second set of fixtures, and pickling on the thin sheet workpieces on the third set of fixtures; simultaneously, engage the fourth set of fixtures onto the moving plate in the operating area; S4: Drive the turntable to rotate 90 degrees clockwise again to transfer the electroplated thin sheet workpieces on the first set of hangers to the operating area for unloading by the robot and clamping the unplated thin sheet workpieces onto the moving plate; at the same time, perform electroplating, water washing and pickling on the thin sheet workpieces on the second, third and fourth sets of hangers.

[0008] This invention uses a turntable to drive multiple sets of fixtures to rotate, enabling pickling, washing, and electroplating processes to be performed in parallel. When pickling, washing, and electroplating thin sheet workpieces, the feeding process is not affected, and the efficiency of the production line is improved by utilizing the overlap of time.

[0009] Furthermore, in S1, the thin plate workpiece is suspended on the first set of hangers by a hook unit, and the first set of hangers is clamped onto the moving plate by a robot arm.

[0010] Furthermore, the hook unit consists of a fixed hook and a rotating hook. An external force is applied to the rotating hook to make it fit with the fixed hook. Then, the holes of several thin plate workpieces are simultaneously inserted into the two sets of hooks. After the external force is released, the rotating hook is reset and together with the fixed hook, they are spread open in the workpiece hole.

[0011] Furthermore, the rotating hook, through the cooperation of a torsion spring and a rotating shaft, allows the angle of the rotating shaft to be adjusted on the fixed seat.

[0012] Furthermore, in S3, each group of thin plate workpieces is perpendicular to the pickling zone, water washing zone, and electroplating zone, and each group of thin plate workpieces is lowered into the pickling tank, water washing tank, and electroplating tank for pickling, water washing, and electroplating.

[0013] Furthermore, in S4, during the pickling, washing, and electroplating of the thin plate workpiece, the second motor drives the rotating block to rotate, and the rotating block drives the connecting rod to move around its center, thereby pulling the sliding rod to move back and forth in a straight line within the first limiting groove, ultimately driving the thin plate workpiece to always move parallel to both sides of the tank during the pickling, washing, and electroplating processes.

[0014] Furthermore, in S2, S3, and S4, when the thin plate workpiece is subjected to pickling, washing, and electroplating operations, it remains in the middle position on both sides of the tank while moving within each tank.

[0015] Furthermore, in S4, while the thin plate workpiece is being pickled in the pickling zone, the adjacent thin plate workpiece can simultaneously undergo water washing and electroplating processes.

[0016] Furthermore, in S4, during the rotation of the turntable, the thin plate workpiece on the hanger passes through the guide groove, the curvature of the guide groove is consistent with the curvature of the hanger during rotation, and the guide groove collects the waste liquid flowing down from the thin plate workpiece.

[0017] Furthermore, in S4, when the moving plate moves above the operating area, it works with the robot to assemble the unplated thin plate workpiece onto the moving plate, which does not affect the pickling, washing and electroplating of thin plate workpieces on other sets of fixtures.

[0018] The beneficial effects of this invention are: 1. In the process of electroplating tin-plated thin plates, the rotation of the turntable drives multiple sets of fixtures to rotate simultaneously, enabling the thin plate workpieces on multiple sets of fixtures to undergo pickling, washing, electroplating and other processes, thereby improving the working efficiency. Moreover, during the pickling, washing and electroplating processes, the fixtures can be continuously loaded, making efficient use of waiting time by utilizing the overlap of process time, and significantly improving the operating efficiency of the production line.

[0019] 2. This invention can simultaneously process workpieces on multiple sets of hangers in pickling tanks, washing tanks, and electroplating tanks. By driving the hangers to move back and forth in a parallel straight line along the long side of the tank, the workpieces pass through the liquid at a uniform speed and smoothly, ensuring that the contact time and current distribution between each workpiece and the liquid are completely consistent. At the same time, the disturbance to the liquid caused by this movement is a regular laminar flow, which can effectively avoid the generation of eddies and dead zones, thereby maintaining the uniformity of the composition, temperature, and metal ion concentration of the liquid in the tank.

[0020] 3. This invention adjusts the angle of the rotating hook to make it parallel to the fixed hook. After the hole on the thin plate workpiece is fitted into the two hooks and then released, the torsion spring resets and drives the rotating hook and the fixed hook to open the hole of the workpiece, thereby preventing the workpiece from shaking during the electroplating process and improving the tin plating quality of the thin plate workpiece. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the operation of the present invention; Figure 3 This is a schematic diagram of the connection between the turntable and the hanger of the present invention; Figure 4 This is a schematic diagram of the lower surface structure of the turntable of the present invention; Figure 5 yes Figure 3 A frontal view diagram; Figure 6 yes Figure 3 A front view sectional diagram; Figure 7 This is a schematic diagram showing the connection between the rotating block and the connecting rod; Figure 8 This is a schematic diagram of the structure of the fixed hook and the rotating hook of the present invention; Figure 9 This is a cross-sectional schematic diagram of the fixing seat of the present invention.

[0022] In the diagram: 1. Support plate; 101. Support rod; 102. First motor; 103. Second motor; 104. Fixing frame; 2. Turntable; 201. First limiting groove; 202. Rotating block; 203. Connecting rod; 204. Hinge shaft; 205. Bearing; 206. Second limiting groove; 3. Sliding rod; 4. Electric push rod; 5. Moving plate; 501. Third limiting groove; 6. Hanger; 601. Large hook; 602. Fixing rod; 603. Fixing seat; 6031. Cavity; 6032. Torsion spring; 604. Fixing hook; 605. Rotating hook; 606. Rotating shaft; 7. Pickling tank; 8. Guide channel; 9. Washing tank; 10. Electroplating tank. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1-2 As shown, an electroplating tin process for a tin-plated sheet includes the following steps: S1: In the operating area, the thin plate workpiece is suspended on the first set of hangers 6 through the hook unit, and the first set of hangers 6 is snapped onto the moving plate 5 by the robot arm, so as to realize the assembly of the workpiece with the hanger 6 and the hanger 6 with the moving plate 5. S2: The first motor 102 drives the turntable 2 to rotate 90 degrees clockwise, transferring the thin plate workpiece on the first set of hangers 6 from the operating area to the pickling area; the electric push rod 4 drives the moving plate 5 to descend, and pickling is performed on the thin plate workpiece on the hanger 6; at the same time, the second set of hangers 6 is engaged with the moving plate 5 in the operating area. S3: Drive the turntable 2 to rotate 90 degrees clockwise again, transferring the thin plate workpieces on the first set of hangers 6 from the pickling area to the washing area; at this time, the thin plate workpieces on the second set of hangers 6 are transferred from the operating area to the pickling area; drive the moving plate 5 to descend again, performing water washing on the thin plate workpieces on the first set of hangers 6 and pickling on the thin plate workpieces on the second set of hangers 6; at the same time, engage the third set of hangers 6 onto the moving plate 5 in the operating area; S4: Next, drive the turntable 2 to rotate 90 degrees clockwise, transferring the thin plate workpieces on the first set of hangers 6 from the washing area to the electroplating area; at this time, the thin plate workpieces on the second set of hangers 6 are transferred from the pickling area to the washing area, and the thin plate workpieces on the third set of hangers 6 are transferred from the operating area to the pickling area; drive the moving plate 5 to descend again, performing electroplating on the thin plate workpieces on the first set of hangers 6, washing on the thin plate workpieces on the second set of hangers 6, and pickling on the thin plate workpieces on the third set of hangers 6; at the same time, engage the fourth set of hangers 6 onto the moving plate 5 in the operating area; S5: Drive the turntable 2 to rotate 90 degrees clockwise again to transfer the electroplated thin plate workpieces on the first set of hangers 6 to the operating area for unloading by the robot and clamping the unplated thin plate workpieces onto the moving plate 5; at the same time, perform electroplating, water washing and pickling on the thin plate workpieces on the second, third and fourth sets of hangers 6. S6: Repeat S5 to complete the loading, pickling, washing, electroplating and unloading of all thin plate workpieces in sequence.

[0025] The turntable 2 is circumferentially distributed with an operation area, an acid pickling area, a water washing area, and an electroplating area. The operation area is used to assemble the thin plate workpieces on the hanger 6 with the moving plate 5. The acid pickling area is equipped with an acid pickling tank 7 for acid pickling the thin plate workpieces. The water washing area is equipped with a water washing tank 9 for water washing the thin plate workpieces. The electroplating area is equipped with an electroplating tank 10 for electroplating the thin plate workpieces.

[0026] A guide channel 8 is provided between the pickling tank 7, the water washing tank 9 and the electroplating tank 10. The guide channel 8 is arc-shaped and matched with the arc of the hanger 6 when it rotates. The guide channel 8 is used to facilitate the collection of waste liquid by the hanger 6 when the thin plate workpiece is rotated to the next process after it is finished in the water washing tank 9 or the pickling tank 7.

[0027] The operation area, pickling area, water washing area and electroplating area are arranged in a cross shape; in the initial state, the four moving plates 5 on the turntable 2 correspond to the operation area, pickling area, water washing area and electroplating area respectively.

[0028] Thin sheet workpieces are suspended on the first set of hangers 6 via hook units. The first set of hangers 6 is then attached to the moving plate 5 by a robotic arm, thus assembling the workpiece with the hangers 6 and the hangers 6 with the moving plate 5. The thin sheet workpieces are distributed perpendicular to the pickling area and are lowered to the pickling tank 7 for pickling. While the thin sheet workpieces are being pickled in the pickling area, the water washing and electroplating processes of adjacent thin sheet workpieces can be carried out simultaneously without interfering with the water washing and electroplating operations of adjacent thin sheet workpieces, thus enabling multiple processes to proceed in parallel.

[0029] The turntable 2 can drive the hanger 6 to rotate. Support rods 101 are rotatably installed around the top of the turntable 2. In this embodiment, there are four support rods 101. A support plate 1 is rotatably installed on the upper surface of the support rods 101. A second motor 103 is rotatably installed on the upper surface of the turntable 2. A bearing 205 is installed between the output end of the second motor 103 and the turntable 2. The output end of the second motor 103 passes through the bearing 205 and is fixedly connected to the upper surface of the rotating block 202. A fixing frame 104 is fixedly installed on the upper part of the second motor 103. The fixing frame 104 is located outside the second motor 103. A first motor 102 is installed on the upper part of the fixing frame 104. The drive shaft of the first motor 102 is fixedly connected to the fixing frame 104. The first motor 102 is fixed on the support plate 1.

[0030] The first motor 102 provides driving force to the turntable 2. The rotation of the turntable 2 causes the hanger 6 to rotate. The rotation of the hanger 6 enables it to move from one process to the next, completing the uninterrupted transition between processes. This achieves automated continuous flow between the tanks and reduces the need for manual intervention.

[0031] Please see Figures 3-7 As shown, a first limiting groove 201 is provided on the lower surface of the turntable 2. The first limiting grooves 201 are distributed circumferentially around the center of the turntable 2. In this embodiment, four first limiting grooves 201 are provided, and the four first limiting grooves 201 are arranged in a cross shape. Each first limiting groove 201 is equipped with a matching sliding rod 3. The first limiting groove 201 is a straight line shape.

[0032] A rotating block 202 is rotatably mounted on the center of the lower surface of the turntable 2. The rotating block 202 is cubic in shape. A hinge shaft 204 is hinged at each of the four corners of the rotating block 202. One end of a connecting rod 203 is fixedly mounted on the hinge shaft 204. The other end of the connecting rod 203 is hinged to the sliding rod 3 through the hinge shaft 204.

[0033] The side wall of the rotating block 202 is provided with a second limiting groove 206, which facilitates the rotation of the rotating rod; the rotating rod is L-shaped; the second limiting groove 206 is arc-shaped; the sliding rods 3 are arranged symmetrically in pairs.

[0034] The second motor 103 drives the rotating block 202 to rotate. When the rotating block 202 rotates, it drives the connecting rod 203 to move around the rotating block 202 as the center. The connecting rod 203 drives the sliding rod 3 to move linearly in the first sliding groove. The sliding rod 3 drives the hanger 6 to move linearly, realizing the hanger 6 to move back and forth linearly in the electroplating tank 10. During the tin plating process of the tin-plated sheet, the workpiece and the two long sides of the electroplating tank 10 are parallel to each other, and the length of the workpiece on the hanger 6 is always equal to the length of the two sides of the tank. The workpiece always maintains a parallel state during the movement.

[0035] When the hanger 6 moves in a straight line parallel to both sides of the electroplating tank 10, the workpiece on the hanger 6 passes through the electroplating solution at a uniform speed and smoothly along the long side of the tank, without any problems of insufficient local contact or over-plating. The plating layer is of uniform thickness and dense crystallization. In contrast, when the hanger 6 rotates in the electroplating tank 10 for tin plating, it reduces the impact of centrifugal force on the workpiece, which can cause shaking, uneven plating solution disturbance, and current distribution deviation, making it easy to have defects such as uneven plating thickness, pinholes, and pitting.

[0036] Parallel movement causes regular laminar flow disturbances to the plating solution, without generating local eddies or dead zones. It can effectively maintain the uniformity of composition, temperature, pH value, and metal ion concentration in the plating solution, ensuring a stable distribution of the electroplating electric field and improving the quality of workpiece electroplating.

[0037] The sliding rod 3 is L-shaped. Symmetrically arranged electric push rods 4 are fixedly installed on the lower surface of the end of the sliding rod 3 away from the turntable 2. The electric push rods 4 are vertically distributed. A movable plate 5 is fixedly installed at the output end of the electric push rod 4. Multiple evenly distributed third limiting grooves 501 are opened on one side of the movable plate 5. A hanger 6 is installed in the third limiting groove 501. The upper large hook 601 of the hanger 6 is engaged in the third limiting groove 501.

[0038] Please see Figure 3 and Figures 8-9 As shown, the hanger 6 is equipped with multiple evenly arranged fixing rods 602, and fixing seats 603 are fixedly installed at both ends of the fixing rods 602. The fixing seats 603 are approximately C-shaped. A hook unit is installed on the fixed base 603. The hook unit consists of a fixed hook 604 and a rotating hook 605. An external force is applied to the rotating hook 605 to make it fit with the fixed hook 604. Then, the holes of several thin plate workpieces are simultaneously inserted into the two sets of hooks. After the external force is released, the rotating hook 605 is reset and together with the fixed hook 604, it is spread open in the workpiece hole.

[0039] The fixed base 603 has symmetrically arranged cavities 6031 inside. A rotating shaft 606 is rotatably installed in the cavity 6031. A torsion spring 6032 is sleeved on the rotating shaft 606. One end of the torsion spring 6032 is connected to the upper side wall of the cavity 6031, and the other end of the torsion spring 6032 is connected to the lower side wall of the cavity 6031.

[0040] A rotating hook 605 is fixedly connected to the support end of the rotating shaft 606, and a fixed hook 604 is also fixedly installed on the fixed base 603.

[0041] The worker manually controls the rotating hook 605 to be aligned with the fixed hook 604, causing the torsion spring 6032 to exert force. Then, the hole on the workpiece is inserted into the fixed hook 604 and the rotating hook 605. When the worker releases his hand, the torsion spring 6032 returns to its original position, and the rotating hook 605 and the fixed hook 604 support the hole on the workpiece, further fixing the workpiece and reducing its shaking during the electroplating process, thus improving the quality of electroplating.

[0042] When the thin plate workpiece on the hanger 6 is electroplated in the electroplating tank 10, the hanger 6 and the long side of the electroplating tank 10 are always kept parallel.

[0043] Working principle: The first motor 102 is fixed on the support plate 1. The first motor 102 outputs driving force to drive the turntable 2 to rotate as a whole. The hanger 6 on the turntable 2 rotates accordingly, so that it enters the pickling tank 7, the guide tank 8, the water washing tank 9, and the electroplating tank 10 in sequence, completing the uninterrupted automated flow of each process and reducing manual intervention. During the electroplating process, the staff unloads the plated workpiece and then clamps the workpiece to be plated. The overlapping of process time realizes the efficient use of waiting time and significantly improves the operating efficiency of the production line.

[0044] When the hanging fixture 6 is continuously and automatically flowing through each process, the guide channel 8 is set between each processing tank to collect the waste liquid carried by the workpiece when it is transferred out of the pickling tank 7 and the washing tank 9, so as to avoid cross-contamination.

[0045] Then, the output end of the second motor 103 is fixedly connected to the rotating block 202 through the bearing 205. When the second motor 103 drives the rotating block 202 to rotate, the connecting rod 203 makes a circular motion with the rotating block 202 as the center, thereby pulling the sliding rod 3 to move back and forth in a straight line in the first limiting groove 201. The electric push rod 4 at the bottom of the sliding rod 3 drives the hanger 6 to move synchronously, ensuring that the hanger 6 and the workpiece are always parallel to the two sides of the tank in the electroplating tank 10.

[0046] By engaging the large hook 601 on the upper part of the hanger 6 into the third limiting groove 501 of the moving plate 5, and then adjusting the angle of the rotating hook 605 to make it parallel with the fixed hook 604, the hole on the workpiece is fitted into the two hooks and then released. The torsion spring 6032 resets and drives the rotating hook 605 and the fixed hook 604 to open the hole of the workpiece, thus preventing the workpiece from shaking during the electroplating process.

[0047] After the hanger 6 rotates with the turntable 2 to the station of the electroplating tank 10, the second motor 103 drives the sliding rod 3 to move the hanger 6 back and forth in a parallel straight line along the long side of the tank. During the parallel movement, the workpiece passes through the electroplating solution at a uniform speed and smoothly, and the contact time and current distribution with the plating solution are consistent. At the same time, the disturbance to the plating solution is a regular laminar flow, which will not generate eddies or dead zones, and maintains the uniformity of the plating solution composition, temperature and metal ion concentration.

[0048] Compared to rotational movement, parallel movement avoids problems such as workpiece shaking and uneven plating solution disturbance caused by centrifugal force, ensuring uniform plating thickness and dense crystallization, and reducing defects such as pinholes and pits.

[0049] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A tin-plating process for tin-plated thin sheets, characterized in that: Includes the following steps: S1: Use the first motor (102) to drive the turntable (2) to rotate 90 degrees clockwise, and transfer the thin plate workpiece on the first set of hangers (6) from the operation area to the pickling area; The electric actuator (4) drives the moving plate (5) to descend, and performs pickling on the thin plate workpiece on the fixture (6); at the same time, the second set of fixtures (6) is snapped onto the moving plate (5) in the operating area. S2: Drive the turntable (2) to rotate 90 degrees clockwise again to transfer the thin plate workpiece on the first set of hangers (6) from the pickling area to the washing area; At this time, the thin plate workpiece on the second set of hangers (6) is transferred from the operating area to the pickling area; the moving plate (5) is driven down again to perform water washing on the thin plate workpiece on the first set of hangers (6) and pickling on the thin plate workpiece on the second set of hangers (6); at the same time, the third set of hangers (6) is snapped onto the moving plate (5) in the operating area. S3: Next, drive the turntable (2) to rotate 90 degrees clockwise to transfer the thin plate workpiece on the first set of hangers (6) from the water washing area to the electroplating area; at this time, the thin plate workpiece on the second set of hangers (6) is transferred from the pickling area to the water washing area, and the thin plate workpiece on the third set of hangers (6) is transferred from the operating area to the pickling area; drive the moving plate (5) to descend again to perform electroplating on the thin plate workpiece on the first set of hangers (6), water washing on the thin plate workpiece on the second set of hangers (6), and pickling on the thin plate workpiece on the third set of hangers (6); at the same time, the fourth set of hangers (6) is snapped onto the moving plate (5) in the operating area; S4: Drive the turntable (2) again to rotate 90 degrees clockwise to transfer the electroplated thin plate workpieces on the first set of hangers (6) to the operating area to unload the workpieces with the robot and clamp the unplated thin plate workpieces onto the moving plate (5); at the same time, perform electroplating, water washing and pickling work on the thin plate workpieces on the second, third and fourth sets of hangers (6).

2. The electroplating tin process for a tin-plated sheet according to claim 1, characterized in that: In S1, the thin plate workpiece is suspended on the first set of hangers (6) by the hook unit, and the first set of hangers (6) is attached to the moving plate (5) by the robot arm.

3. The electroplating tin process for a tin-plated sheet according to claim 2, characterized in that: The hook unit consists of a fixed hook (604) and a rotating hook (605). An external force is applied to the rotating hook (605) to make it fit with the fixed hook (604). Then, the holes of several thin plate workpieces are simultaneously inserted into the two sets of hooks. After the external force is released, the rotating hook (605) is reset and together with the fixed hook (604) is spread open in the workpiece hole.

4. The electroplating tin process for a tin-plated sheet according to claim 3, characterized in that: The rotating hook (605) allows the angle of the rotating shaft (606) to be adjusted on the fixed seat (603) through the cooperation of the torsion spring (6032) and the rotating shaft (606).

5. The electroplating tin process for a tin-plated sheet according to claim 1, characterized in that: In S3, each group of thin plate workpieces is perpendicular to the pickling zone, water washing zone and electroplating zone, and each group of thin plate workpieces is lowered into the pickling tank (7), water washing tank (9) and electroplating tank (10) for pickling, water washing and electroplating.

6. The electroplating tin process for a tin-plated sheet according to claim 1, characterized in that: In S4, when the thin plate workpiece is pickled, washed, and electroplated, the second motor (103) drives the rotating block (202) to rotate. The rotating block (202) drives the connecting rod (203) to move around its center, thereby pulling the sliding rod (3) to move back and forth in a straight line in the first limiting groove (201). Finally, the thin plate workpiece is always parallel to both sides of the tank for pickling, washing, and electroplating.

7. The electroplating tin process for a tin-plated sheet according to claim 1, characterized in that: In S2, S3 and S4, when the thin plate workpiece is being pickled, washed, and electroplated, it remains in the middle position on both sides of the tank while moving horizontally within each tank.

8. The electroplating tin process for a tin-plated sheet according to claim 1, characterized in that: In step S4, while the thin plate workpiece is being pickled in the pickling zone, the adjacent thin plate workpieces can simultaneously undergo water washing and electroplating processes.

9. The electroplating tin process for a tin-plated sheet according to claim 1, characterized in that: In S4, during the rotation of the turntable (2), the thin plate workpiece on the hanger (6) passes through the guide groove (8). The arc of the guide groove (8) is consistent with the arc of the hanger (6) when it rotates. The guide groove (8) collects the waste liquid flowing down from the thin plate workpiece.

10. The electroplating tin process for a tin-plated sheet according to claim 1, characterized in that: In S4, when the moving plate (5) moves above the operating area, it works with the robot to assemble the unplated thin plate workpiece onto the moving plate (5), which does not affect the pickling, washing and electroplating of the thin plate workpieces on other sets of hangers (6).

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