Electroplating device for hanging nickel plating

Abstract

The present application relates to surface treatment and electrochemical processing equipment technical field, specifically is related to a kind of hanging plating nickel electroplating device, for solving the technical problems of "edge effect" and the liquid temperature fluctuation caused edge shielding imbalance commonly existing in electroplating process, the device includes electrolytic cell, shielding frame and symmetrically arranged shielding control component.Working, shielding frame is set in the periphery of workpiece, and the edge electric line is physically isolated;Shielding control component is equipped with flow resistance frame strip and temperature sensing driving mechanism, temperature sensing driving mechanism can be directly driven flow resistance frame strip to produce the physical displacement close to or away from the side of workpiece by real-time sensing temperature fluctuation of electrolyte.The present application realizes the dynamic closed-loop compensation of shielding strength by "sensing combined with execution" integrated mechanical self-driving mode, effectively eliminates edge scorching and tumorous defects, significantly improves the consistency and high reliability of coating quality in high-end component continuous production.

Description

Technical Field

[0001] This invention relates to the field of surface treatment and electrochemical processing equipment technology, specifically to an electroplating apparatus for nickel plating. Background Technology

[0002] The current high-end equipment manufacturing industry clearly states that it needs to focus on developing high-reliability manufacturing technologies and intelligent equipment for the entire process of metal components to support the large-scale application of critical components in fields such as industrial machine tools, transportation power, and marine engineering equipment. Surface treatment, as an indispensable key link in the preparation and high-reliability manufacturing of metal components, directly determines the final performance and service life of critical components in high-end equipment due to the stability and precision of its processes. Nickel plating, a widely used electroplating process for corrosion protection and strengthening of metal component surfaces, still faces bottlenecks in yield and processing accuracy that are difficult to overcome with existing technologies in actual large-scale industrial applications.

[0003] First, the "edge effect" is a persistent and difficult-to-eliminate problem in electroplating. Because electric field lines spontaneously converge towards the tip or edge of the workpiece under the influence of an electric field, the sides and bottom edges of the workpiece often experience localized current densities far exceeding normal loads. For high-precision rack plating of nickel, this uneven current distribution easily leads to distortions in the microstructure of the plating layer, resulting in physical defects such as scorching, nodules, or increased brittleness due to excessive hydrogen evolution. This severely damages the geometric accuracy and mechanical reliability of precision components.

[0004] Secondly, for thin-edged workpieces with high stress sensitivity, the potential gradient distribution around them is easily affected by severe environmental variables. In continuous electroplating operations, fluctuations in electrolyte temperature directly cause nonlinear changes in solution conductivity and ion migration rate, thereby dynamically altering the coupling strength of electric field lines around the thin edge. Existing shielding technologies mostly employ fixed physical baffles, whose shielding area and relative distance cannot be changed once set, making it difficult to sense temperature field changes in real time and make adaptive physical displacement compensation. This leads to the shielding strength easily jumping between edge scorching due to insufficient shielding and edge plating defects due to excessive shielding in production environments with fluctuating liquid temperatures, making it difficult to meet the consistent quality stability requirements of high-reliability manufacturing throughout the entire process.

[0005] Therefore, how to provide a rack-plating nickel plating device that can accurately suppress edge effects and achieve dynamic shielding compensation according to changes in liquid temperature is a key technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] Therefore, it is necessary to provide an electroplating apparatus for nickel plating to address the problems of existing technologies.

[0007] To address the problems of existing technologies, the present invention adopts the following technical solution: an electroplating apparatus for nickel plating, comprising:

[0008] An electrolytic cell, connected to an inlet pipe and an outlet pipe;

[0009] Anode plates are provided, and are spaced apart along the length of the electrolytic cell;

[0010] A cathode clamping assembly is disposed between two adjacent anode plates. Each clamping assembly includes a lifting frame and several conductive clamps mounted on the lifting frame for vertically clamping the workpiece.

[0011] An edge anti-scorching assembly includes a shielding frame and a displacement drive for driving the shielding frame to move. The shielding frame is fitted around the workpiece when the workpiece is lowered into the electrolytic cell.

[0012] The shielding control assembly has two sets symmetrically arranged on both sides of the shielding frame. Each set of the shielding control assembly includes a flow-blocking frame and a temperature-sensing driving mechanism. The flow-blocking frame is arranged corresponding to the side of the workpiece.

[0013] The temperature-sensing drive mechanism includes a temperature-sensing element, a transmission mechanism, and an actuator. The temperature-sensing element is used to sense changes in the electrolyte temperature and deform to generate a driving force. The transmission mechanism transmits the driving force to the actuator, and the actuator drives the flow-blocking frame to move in a direction closer to or further away from the workpiece side to adjust the shielding strength against the current on the workpiece side.

[0014] Furthermore, the flow-blocking frame is parallel to the vertical side plate of the shielding frame, and the flow-blocking frame is slidably connected to the shielding frame through several limiting sliding shafts. Each vertical side plate of the shielding frame is provided with a strip connecting plate connected to several limiting sliding shafts.

[0015] Furthermore, the executor includes:

[0016] The mounting base is fixedly connected to the vertical side plate of the shielding frame;

[0017] An internally threaded sleeve is connected to the mounting base, and the axis of the internally threaded sleeve is perpendicular to the strip connecting plate;

[0018] The threaded rotating rod is threadedly engaged with the internal threaded sleeve. One end of the threaded rotating rod passes through the strip connecting plate and is rotatably connected to the strip connecting plate. Both sides of the strip connecting plate are provided with retaining rings to prevent the threaded rotating rod from axially displacing relative to it.

[0019] Furthermore, the transmission mechanism includes:

[0020] The heat-insulating outer shell is fixedly connected to the vertical side plate of the shielding frame;

[0021] A planetary gear set is installed inside the heat insulation housing, and the gear ring in the planetary gear set is fixedly connected to the inner wall of the heat insulation housing;

[0022] The output shaft is coaxially and fixedly connected to the central gear in the planetary gear set;

[0023] The input shaft secures the planet carrier in the planetary gear set.

[0024] The driving force generated by the temperature sensing element is transmitted to the planet carrier in the planetary gear set through the input shaft. The end of the output shaft is coaxially fixed to a transmission sleeve, and one end of the threaded rotating rod is inserted into the transmission sleeve, with the two in spline engagement.

[0025] Furthermore, the temperature sensing element is a coiled metal spring with a double-layer structure, the inner layer being a heat-resistant layer and the outer layer being a temperature-sensing layer. A heat-conducting shell is connected to one side of the heat-insulating shell, and a heat-insulating layer is provided between the two. The metal spring is installed inside the heat-conducting shell, and the outer end of the metal spring is fixedly connected to the inner wall of the heat-conducting shell. The input shaft is fixedly connected to the inner end of the metal spring.

[0026] Furthermore, the shielding frame is vertically arranged and includes an inverted U-shaped frame and a movable bottom edge plate. The movable bottom edge plate is slidably connected to the inverted U-shaped frame along the thickness direction of the workpiece. Both ends of the movable bottom edge plate are provided with support bars. The two ends of the support bars are respectively provided with a first wedge block and a second wedge block. Each support bar is provided with an abutment member fixed to the inner wall of the electrolytic cell below it. The abutment member includes a third wedge block and a fourth wedge block.

[0027] When the shielding frame descends to its position, the first wedge block and the third wedge block slide together to drive the movable bottom plate to extend towards the workpiece, thereby shielding the bottom edge of the workpiece; when the shielding frame rises to its reset position, the second wedge block and the fourth wedge block slide together to drive the movable bottom plate to retract in the opposite direction, thereby avoiding the workpiece.

[0028] Furthermore, the displacement driving component includes a guide block and a lifting ring. The guide block is slidably connected to the middle of the lifting frame in the vertical direction. The lifting ring is fixed to the top of the guide block. The top of the shielding frame is fixedly connected to the guide block. The lifting frame is provided with an upper limit plate and a lower limit plate for limiting the lifting stroke of the guide block.

[0029] Furthermore, the lifting frame spans the electrolytic cell in the width direction, and both sides of the lifting frame are provided with supporting arms fixedly connected to the outer wall of the electrolytic cell. The lifting frame slides vertically between the two supporting arms, and the lower end of each supporting arm is fixedly provided with a limiting block for limiting the descent stroke of the lifting frame.

[0030] Furthermore, each side of the electrolytic cell along its length is fixedly provided with a conductive copper busbar, and each anode plate is suspended between two conductive copper busbars by a conductive frame.

[0031] Furthermore, a return water tank is fixedly provided below the electrolytic cell, and the drain pipe connects the return water tank to the electrolytic cell. A supply tank for injecting electrolyte into the electrolytic cell in real time through the inlet pipe is fixedly provided on the side of the return water tank.

[0032] The beneficial effects of this invention compared to the prior art are:

[0033] This invention constructs an adaptive dynamic adjustment system for the edge potential of workpieces by cooperating with a shielding frame and shielding control components, effectively suppressing the "edge effect" during electroplating. Specifically, this invention utilizes a temperature-sensing drive mechanism to sense fluctuations in electrolyte temperature in real time and accurately convert them into physical displacement of the flow-blocking frame relative to the side of the workpiece. This allows for spontaneous closed-loop compensation of shielding strength based on the influence of liquid temperature on conductivity and electric field distribution, completely solving the problem of uncontrolled shielding strength in traditional fixed shielding structures when ambient temperature changes. This integrated mechanical self-driving mode of "sensing combined with execution" not only ensures a high degree of consistency in current density distribution between the workpiece edge and center areas, fundamentally eliminating plating defects such as edge scorching and nodules, but also significantly improves the reliability and process stability of plating quality for precision components in continuous and intelligent production, meeting the technical requirements for high-reliability manufacturing of key components in high-end equipment throughout the entire process. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0035] Figure 2 yes Figure 1 A magnified view of the area indicated by A1 in the diagram;

[0036] Figure 3 It is a three-dimensional cross-sectional view of the electrolytic cell;

[0037] Figure 4 yes Figure 3 The enlarged view of the area indicated by A2 in the diagram;

[0038] Figure 5This is a three-dimensional structural diagram of the shielding frame when the workpiece is lowered into the electrolytic cell;

[0039] Figure 6 This is a three-dimensional structural diagram of the movable bottom edge plate when it retracts.

[0040] Figure 7 This is a planar schematic diagram of the edge anti-scorching component when the workpiece is in the rising state;

[0041] Figure 8 yes Figure 7 The enlarged view of the area indicated in A3;

[0042] Figure 9 It is a three-dimensional structural cross-sectional view of the shielding control component;

[0043] Figure 10 It is a planar sectional view of the shielding control component;

[0044] Figure 11 It is an exploded three-dimensional structural diagram of the threaded rod and transmission sleeve.

[0045] The following are labeled in the diagram: 1. Electrolytic cell; 2. Inlet pipe; 3. Drain pipe; 4. Anode plate; 5. Lifting frame; 6. Conductive clamp; 7. Shielding frame; 8. Flow-blocking strip; 9. Limiting slide shaft; 10. Strip connecting plate; 11. Mounting base; 12. Internal threaded sleeve; 13. Threaded rotating rod; 14. Heat insulation shell; 15. Planetary gear set; 16. Output shaft; 17. Input shaft; 18. Transmission sleeve; 19. Metal spring. ; 20. Heat-conducting outer shell; 21. Inverted U-shaped frame; 22. Movable bottom edge plate; 23. Support bar; 24. First inclined wedge block; 25. Second inclined wedge block; 26. Third inclined wedge block; 27. Fourth inclined wedge block; 28. Guide block; 29. ​​Lifting ring; 30. Upper limit plate; 31. Lower limit plate; 32. Support arm; 33. Limiting block; 34. Conductive copper busbar; 35. Conductive frame; 36. Return water tank; 37. Liquid supply tank. Detailed Implementation

[0046] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0047] refer to Figures 1 to 11The electroplating apparatus for nickel plating shown includes an electrolytic cell 1 connected to an inlet pipe 2 and an outlet pipe 3. The coordination of these two pipes enables real-time circulation and renewal of the electrolyte within the cell, ensuring the uniformity of the chemical composition. In practice, we found that the arrangement of the anode plates 4 directly affects the distribution of electric lines and the flow of the liquid. Therefore, several anode plates 4 are arranged at intervals along the length of the electrolytic cell 1. After installation, a gap is intentionally left between the anode plates 4 and the inner wall of the electrolytic cell 1 to allow for electrolyte flow, which promotes ion exchange efficiency between the anode and cathode. Simultaneously, the anode plates 4 are not completely submerged in the electrolyte; the portion exposed above the liquid surface is used for connection to an external power source. This is to prevent severe electrochemical corrosion or abnormal electrolytic losses caused by contact with the electrolyte at the conductive contact points of the anode plates 4. A cathode clamping assembly is provided between the anode plates 4. Each cathode clamping assembly includes a lifting frame 5 and several conductive clamps 6 mounted on the lifting frame 5 for vertically clamping the workpiece. The conductive clamps 6 can stably suspend the workpiece and ensure reliable current conduction.

[0048] In actual operation, we found that workpieces often suffer from defects such as scorching and nodules at the edges during electroplating due to excessive current density. Therefore, this device is equipped with an edge anti-scorching component, such as... Figure 2 As shown, it includes a shielding frame 7 and a displacement drive for driving the shielding frame 7. The shielding frame 7 is fitted around the workpiece when the workpiece is lowered into the electrolytic cell 1. The shielding effect of the shielding frame 7 on the edge of the workpiece is that it can physically block and redistribute the electric field lines flowing to the edge of the workpiece, so that the current density at the edge is reduced to a reasonable range. Considering that the electroplating production environment is highly corrosive and that the workpiece needs to be completely submerged in the electrolyte during actual use, the conductive clamp 6, the shielding frame 7, the heat insulation shell 14 and the heat-conducting shell 20, and a series of parts submerged in the electrolyte are all coated with an anti-corrosion layer or made of corrosion-resistant electrolytic materials to ensure the structural integrity of the equipment under long-term operation.

[0049] In actual operation, because the overall thickness of the workpiece is uneven, with two thinner sides, these thinner sides are more susceptible to current influence. Therefore, this device is specially equipped with shielding and control components, such as... Figure 2As shown, the component has two sets symmetrically arranged on both sides of the shielding frame 7. Each set of shielding control components includes a flow-blocking frame 8 and a temperature-sensing drive mechanism. The flow-blocking frame 8 is arranged corresponding to the side of the workpiece. The actual function of the flow-blocking frame 8 is to act as a dynamic electric field barrier. By changing its relative distance to the side of the workpiece, the area and strength of the local shielding area can be precisely adjusted. The temperature-sensing drive mechanism includes a temperature-sensing element, a transmission mechanism, and an actuator. The temperature-sensing element is used to sense changes in the electrolyte temperature and deform to generate a driving force. The transmission mechanism transmits this driving force to the actuator, and the actuator drives the flow-blocking frame 8 to move in a direction closer to or away from the side of the workpiece, thereby realizing automatic compensation of the shielding strength as the liquid temperature changes.

[0050] To ensure the smooth displacement of the flow-blocking frame 8, such as Figure 2 , Figure 9 and Figure 10 As shown, the flow-blocking frame 8 is parallel to the vertical side plate of the shielding frame 7. The flow-blocking frame 8 is slidably connected to the shielding frame 7 through several limiting slide shafts 9. Each vertical side plate of the shielding frame 7 is provided with a strip connecting plate 10 connected to several limiting slide shafts 9. The actuator specifically includes a mounting base 11, an internal threaded sleeve 12, and a threaded rotating rod 13. The mounting base 11 is fixedly connected to the vertical side plate of the shielding frame 7. The internal threaded sleeve 12 is connected to the mounting base 11. The axis of the internal threaded sleeve 12 is perpendicular to the strip connecting plate 10. The threaded rotating rod 13 is threadedly engaged with the internal threaded sleeve 12. One end of the threaded rotating rod 13 passes through the strip connecting plate 10 and is rotatably connected to the strip connecting plate 10. Both sides of the strip connecting plate 10 are provided with retaining rings to prevent the threaded rotating rod 13 from axially displacing relative to it. When the threaded rotating rod 13 is driven to rotate, through the conversion action of the threaded pair, it can drive the strip connecting plate 10 and the flow-blocking frame 8 to perform precise linear reciprocating motion.

[0051] The linear reciprocating motion of the threaded rod 13 requires a precise and stable power source. In practice, we found that the small deformation of the temperature sensing element is difficult to meet the requirements of direct drive, and effective torque conversion and transmission amplification are necessary.

[0052] In response to this need, such as Figures 9 to 10As shown, the transmission mechanism includes a heat-insulating housing 14, a planetary gear set 15, an output shaft 16, and an input shaft 17. The temperature-sensing element is a coiled metal spring 19, which has a double-layer structure with an inner heat-resistant layer and an outer temperature-sensing layer. A heat-conducting housing 20 is connected to one side of the heat-insulating housing 14, and a heat-insulating layer is provided between the two. The metal spring 19 is installed inside the heat-conducting housing 20, and the outer end of the metal spring 19 is fixed to the inner wall of the heat-conducting housing 20. The input shaft 17 is fixed to the inner end of the metal spring 19. It should be noted that in actual use, in order to improve the temperature sensing efficiency of the metal spring 19, the heat-conducting housing 20 is sealed and filled with a heat-conducting medium. This heat-conducting medium exists only inside the heat-conducting housing 20 and will not flow out or flow to the heat-insulating housing 14. The heat-conducting medium is used to better achieve heat transfer and eliminate air thermal resistance. When the temperature of the electrolyte in the electrolytic cell 1 fluctuates, heat is rapidly and evenly transferred to the metal spring 19 through the heat-conducting outer shell 20 and the internal heat-conducting medium. Since the temperature-sensing layer on the outside of the metal spring 19 and the temperature-resistant layer on the inside have significantly different coefficients of thermal expansion, the outer layer expands when heated or contracts when cooled much more than the inner layer. This asynchronous volume deformation causes strong bending stress to be generated between the layers of the coiled metal spring 19. Since the outer end of the metal spring 19 is firmly fixed to the inner wall of the heat-conducting outer shell 20, this stress cannot be released outward and can only force its free inner end to produce angular displacement, thereby accurately converting thermal energy into mechanical energy and generating rotational driving force (torque).

[0053] Subsequently, this rotational driving force enters into a series of precise transmission processes. For example... Figures 9 to 11 As shown, the planetary gear set 15 is installed inside the heat insulation housing 14. The gear ring in the planetary gear set 15 is fixedly connected to the inner wall of the heat insulation housing 14. The output shaft 16 is coaxially fixedly connected to the central gear in the planetary gear set 15. The input shaft 17 is fixedly connected to the planet carrier in the planetary gear set 15. When the rotational driving force generated by the inner end of the metal spring 19 drives the input shaft 17 to rotate, the input shaft 17 directly drives the planet carrier to rotate synchronously. Since the gear ring is fixed, the planetary gears installed on the planet carrier will revolve around the gear ring and rotate on their own axis. Through the mechanical meshing of the planetary gears, the power is transmitted to the central gear located at the center, utilizing the transmission of the planetary gear set 15. The dynamic ratio characteristic amplifies the minute rotational speed or torque of the input shaft 17, and drives the output shaft 16 to rotate stably by the central gear. At the same time, the end of the output shaft 16 is coaxially fixed to the transmission sleeve 18, and one end of the threaded rod 13 is inserted into the transmission sleeve 18. The two are splined together, and the rotational power of the output shaft 16 is transmitted to the threaded rod 13 without loss through the transmission sleeve 18. The unique structure of the splined connection ensures the coaxial transmission of torque, while also allowing the threaded rod 13 to produce a minute axial slip when it is heated or subjected to force, avoiding mechanical jamming. Finally, the rotational motion of the threaded rod 13 is converted into the smooth linear displacement of the aforementioned flow-blocking frame 8.

[0054] To prevent the shielding frame 7 from interfering with the workpiece during lifting, such as Figure 5 and Figure 6 As shown, the shielding frame 7 is vertically arranged and includes an inverted U-shaped frame 21 and a movable bottom plate 22. The movable bottom plate 22 is slidably connected to the inverted U-shaped frame 21 along the thickness direction of the workpiece. Each end of the movable bottom plate 22 is provided with a support bar 23, and each end of the support bar 23 is provided with a first wedge block 24 and a second wedge block 25. Below each support bar 23 is an abutment member fixed to the inner wall of the electrolytic cell 1, including a third wedge block 26 and a fourth wedge block 27. When the shielding frame 7 descends to its position, the first wedge block 24 and the third wedge block 26 slide to drive the movable bottom plate 22 to extend towards the workpiece, effectively shielding the electric field lines at the bottom edge of the workpiece. When the shielding frame 7 rises to its reset position, the second wedge block 25 and the fourth wedge block 27 slide to drive the movable bottom plate 22 to retract in the opposite direction, thereby avoiding the workpiece and preventing it from colliding with the workpiece due to the protruding bottom plate.

[0055] In actual operation, we found that a reasonable lifting sequence design is crucial for ensuring the safety of the workpiece entering and exiting the slot and the immediacy of the shielding effect. Therefore, this device achieves asynchronous linkage between the shielding frame 7 and the workpiece through a specific mechanical structure. Specifically, as follows... Figure 2 and Figure 5 As shown, the displacement drive includes a guide block 28 and a lifting ring 29. The guide block 28 is slidably connected to the middle of the lifting frame 5 in the vertical direction. The top of the shielding frame 7 is fixedly connected to the guide block 28. The lifting frame 5 is provided with an upper limit plate 30 and a lower limit plate 31 for limiting the lifting stroke of the guide block 28.

[0056] The specific travel logic described above is as follows: In the initial state, the shielding frame 7 and the workpiece are on the same plane. When the lifting ring 29 is driven to descend, the guide block 28 descends first. At this time, the lifting frame 5 drives the workpiece and the guide block 28 to descend synchronously under the action of gravity and enter the electrolytic cell 1. When the lifting frame 5 descends to the point of contacting the limiting block 33 at the lower end of the support arm 32 and stops displacing, due to the sliding gap between the guide block 28 and the lifting frame 5, the guide block 28 will descend again relative to the lifting frame 5, thereby driving the shielding frame 7 to continue to descend and accurately fit around the workpiece, ensuring that the edge of the workpiece is shielded and protected at the first moment of electroplating.

[0057] In actual operation, we further discovered that this sequential structure can also play a role in avoiding and protecting the workpiece when it leaves the electroplating tank. When the workpiece needs to be removed after electroplating, the guide block 28 is lifted by the lifting ring 29. At this time, since the weight of the lifting frame 5 and the workpiece it carries is much greater than the combined force of the guide block 28 and the shielding frame 7, the shielding frame 7 will move upward before the workpiece until the shielding frame 7 rises above the workpiece. At this time, the guide block 28 and the upper limit plate 30 make physical contact. As the guide block 28 continues to rise, the upper limit plate 30 transmits the pulling force to the lifting frame 5, thereby driving the lifting frame 5 and the workpiece to rise synchronously until the workpiece is completely removed from the electrolytic cell 1. This stroke control of the guide block 28 between the upper limit plate 30 and the lower limit plate 31 effectively avoids the workpiece collision damage caused by the interference of the shielding frame 7 during the extraction process.

[0058] To further improve the overall structural load capacity and operational stability, such as Figures 1 to 3 As shown, the lifting frame 5 spans across the electrolytic cell 1 along its width, and the supporting arm 32 is fixed to the outer wall of the electrolytic cell 1, providing a vertical sliding track for the lifting frame 5. Furthermore, each side of the electrolytic cell 1 along its length is fixedly equipped with a conductive copper busbar 34, and each anode plate 4 is suspended between two conductive copper busbars 34 via a conductive frame 35 to achieve a stable current supply. A return water tank 36 is fixedly installed below the electrolytic cell 1, and a drain pipe 3 connects the return water tank 36 to the electrolytic cell 1. A supply tank 37 is fixedly installed beside the return water tank 36, and the supply tank 37 injects electrolyte into the electrolytic cell 1 in real time through an inlet pipe 2. This closed-loop liquid management system, combined with the aforementioned automatic shielding and control structure, ensures the high quality and high stability of the nickel plating operation.

[0059] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. An electroplating apparatus for nickel plating, characterized in that, include: An electrolytic cell (1) is connected to an inlet pipe (2) and an outlet pipe (3); Anode plates (4) are provided in a plurality of positions and are spaced apart along the length of the electrolytic cell (1); A cathode clamping assembly is disposed between two adjacent anode plates (4). Each clamping assembly includes a lifting frame (5) and several conductive clamps (6) mounted on the lifting frame (5) for vertically clamping the workpiece. The edge anti-scorching component includes a shielding frame (7) and a displacement drive for driving the shielding frame (7) to move. The shielding frame (7) is fitted around the workpiece when the workpiece is lowered into the electrolytic cell (1). The shielding control assembly is provided in two sets and symmetrically arranged on both sides of the shielding frame (7). Each set of the shielding control assembly includes a flow-blocking frame (8) and a temperature-sensing driving mechanism. The flow-blocking frame (8) is arranged corresponding to the side of the workpiece. The temperature-sensing drive mechanism includes a temperature-sensing element, a transmission mechanism, and an actuator. The temperature-sensing element is used to sense changes in electrolyte temperature and deform to generate a driving force. The transmission mechanism transmits the driving force to the actuator, and the actuator drives the flow-blocking frame (8) to move in a direction close to or away from the workpiece side to adjust the shielding strength against the current on the workpiece side.

2. The electroplating apparatus for nickel plating according to claim 1, characterized in that, The flow-blocking frame (8) is parallel to the vertical side plate of the shielding frame (7). The flow-blocking frame (8) is slidably connected to the shielding frame (7) through several limiting slide shafts (9). Each vertical side plate of the shielding frame (7) is provided with a strip connecting plate (10) connected to several limiting slide shafts (9).

3. The electroplating apparatus for nickel plating according to claim 2, characterized in that, The executable includes: Mounting base (11) is fixedly connected to the vertical side plate of the shielding frame (7); An internal threaded sleeve (12) is connected to the mounting base (11), and the axis of the internal threaded sleeve (12) is perpendicular to the strip connecting plate (10). The threaded rod (13) is threadedly engaged with the internal threaded sleeve (12). One end of the threaded rod (13) passes through the strip connecting plate (10) and is rotatably connected to the strip connecting plate (10). Both sides of the strip connecting plate (10) are provided with retaining rings to prevent the threaded rod (13) from axially displacing relative to it.

4. The electroplating apparatus for rack-plating nickel according to claim 3, characterized in that, The transmission mechanism includes: The heat-insulating shell (14) is fixedly connected to the vertical side plate of the shielding frame (7); Planetary gear set (15) is installed inside the heat insulation shell (14), and the gear ring in the planetary gear set (15) is fixedly connected to the inner wall of the heat insulation shell (14); The output shaft (16) is coaxially fixed to the central gear in the planetary gear set (15); Input shaft (17) secures the planet carrier in the planetary gear set (15); The driving force generated by the temperature sensing element is transmitted to the planet carrier in the planetary gear set (15) through the input shaft (17). The end of the output shaft (16) is coaxially fixed to the transmission sleeve (18). One end of the threaded rotating rod (13) is inserted into the transmission sleeve (18), and the two are splined together.

5. The electroplating apparatus for rack-plating nickel according to claim 4, characterized in that, The temperature sensing element is a coiled metal spring (19). The metal spring (19) has a double-layer structure, with an inner heat-resistant layer and an outer temperature-sensing layer. A heat-conducting shell (20) is connected to one side of the heat-insulating shell (14), and a heat-insulating layer is provided between the two. The metal spring (19) is installed inside the heat-conducting shell (20). The outer end of the metal spring (19) is fixedly connected to the inner wall of the heat-conducting shell (20). The input shaft (17) is fixedly connected to the inner end of the metal spring (19).

6. The electroplating apparatus for rack-plating nickel according to claim 1, characterized in that, The shielding frame (7) is vertically arranged and includes an inverted U-shaped frame (21) and a movable bottom plate (22). The movable bottom plate (22) is slidably connected to the inverted U-shaped frame (21) along the thickness direction of the workpiece. Both ends of the movable bottom plate (22) are provided with support bars (23). The two ends of the support bars (23) are respectively provided with a first wedge block (24) and a second wedge block (25). Each support bar (23) is provided with an abutment component that is fixed to the inner wall of the electrolytic cell (1). The abutment component includes a third wedge block (26) and a fourth wedge block (27). When the shielding frame (7) descends to its position, the first wedge (24) and the third wedge (26) slide together to drive the movable bottom plate (22) to extend towards the workpiece to shield the bottom edge of the workpiece; when the shielding frame (7) rises to its reset position, the second wedge (25) and the fourth wedge (27) slide together to drive the movable bottom plate (22) to retract in the opposite direction to avoid the workpiece.

7. The electroplating apparatus for rack-plating nickel according to claim 1, characterized in that, The displacement drive component includes a guide block (28) and a lifting ring (29). The guide block (28) is slidably connected to the middle of the lifting frame (5) in the vertical direction. The lifting ring (29) is fixed to the top of the guide block (28). The top of the shielding frame (7) is fixedly connected to the guide block (28). The lifting frame (5) is provided with an upper limit plate (30) and a lower limit plate (31) for limiting the lifting stroke of the guide block (28).

8. The electroplating apparatus for rack-plating nickel according to claim 1, characterized in that, The lifting frame (5) spans the electrolytic cell (1) in the width direction. Both sides of the lifting frame (5) are provided with supporting arms (32) that are fixed to the outer wall of the electrolytic cell (1). The lifting frame (5) slides between the two supporting arms (32) in the vertical direction. Each supporting arm (32) has a limiting block (33) fixed at its lower end to limit the descent stroke of the lifting frame (5).

9. The electroplating apparatus for rack-plating nickel according to claim 1, characterized in that, Each of the electrolytic cells (1) is fixed with a conductive copper busbar (34) on the top of each side along its length direction, and each of the anode plates (4) is suspended between two of the conductive copper busbars (34) by a conductive frame (35).

10. The electroplating apparatus for rack-plating nickel according to claim 1, characterized in that, A return water tank (36) is fixedly provided below the electrolytic cell (1). The drain pipe (3) connects the return water tank (36) to the electrolytic cell (1). A supply tank (37) is fixedly provided on the side of the return water tank (36) to inject electrolyte into the electrolytic cell (1) in real time through the inlet pipe (2).

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