A continuous wire electro-coating apparatus

Abstract

The application relates to the technical field of metal plating, in particular to a metal wire continuous electric coating device. The device comprises a wire unwinding device, a wire winding device, a coating tank, a power supply and a conductive device. The conductive devices are symmetrically arranged on the two sides of the coating tank or between the two coating tanks. The metal wire is sequentially wound on the wire spool of the wire unwinding device, the metal wheel of the conductive device and the wire spool of the wire winding device, and the metal wire is driven to move by the wire spool. The metal wire passes through the coating tank and is completely immersed in the coating liquid in the coating tank. The device can improve the uniformity of current distribution during metal wire plating through the symmetric design of the negative electrode and the multi-negative electrode design, prevent local high current density, prevent coating scorching and hydrogen pores generated by high current density, and improve the compactness of the coating.

Description

Technical Field

[0001] This utility model relates to the field of metal plating technology, specifically to a device for continuous electroplating of metal wires. Background Technology

[0002] Continuous electroplating technology for metal wires, as an important method in the field of surface treatment, has made significant progress in recent years through automation control and process optimization. Among existing technologies, the rotating cathode traction mechanism proposed in British Patent GB1372341A effectively improves the uniformity of metal wire transmission and avoids surface scratches caused by traditional mechanical clamping. For example, Chinese Patent CN103741186A achieves online control of coating thickness through a segmented anode structure and a closed-loop feedback system.

[0003] However, existing equipment still suffers from the following drawbacks during electroplating: prominent local current density polarization; due to uneven electric field distribution between the anode and the metal wire (especially at the wire edges), local hot spots with large current density gradients are easily formed, leading to coarse coating grains or even scorching. Simultaneously, uneven current distribution also results in uneven hydrogen evolution side reactions, and unvented hydrogen gas can form micropores at the coating / solution interface. All of these problems contribute to a decrease in the density of the coating.

[0004] Therefore, there is a need to propose a continuous electrocoating device for metal wires with uniform current distribution in order to improve the density of the metal wire coating. Utility Model Content

[0005] To address the problems of existing technologies, this invention proposes a continuous electrocoating device for metal wires. The specific solution is as follows:

[0006] A continuous electrocoating device for metal wire includes: a wire feeding device, a wire take-up device, a coating tank, a power supply, a coating anode, and a conductive device. The wire feeding device and the wire take-up device are located at opposite ends of the coating tank. Conductive devices are arranged symmetrically about the coating tank between the wire feeding device and the coating tank, and between the wire take-up device and the coating tank. Each conductive device includes a housing, a metal stator, a liquid conductive medium, a metal rotor, and a metal wheel. One end of the metal stator is fixed inside the housing, and one end of the metal rotor is rotatably connected inside the housing while the other end is fixed to the metal wheel. The space between the metal stator and the metal rotor is filled with the liquid conductive medium. The metal wire is sequentially wound onto the spool of the wire feeding device, the metal wheel of the conductive device, and the spool of the wire take-up device. The spool drives the metal wire to move, and the metal wire passes through the coating tank and is completely immersed in the coating liquid. The metal stator of the conductive device is connected to the negative terminal of the power supply, and the coating anode in the coating tank is connected to the positive terminal of the power supply.

[0007] Furthermore, it includes multiple coating grooves, and conductive devices are also provided between adjacent coating grooves. The conductive devices on both sides of each coating groove are symmetrical about the coating groove.

[0008] Furthermore, the coated anode is in the form of a sheet or a C-shaped cylinder.

[0009] Furthermore, one end of the metal rotor is rotatably connected to the housing via a bearing.

[0010] Furthermore, the conductive devices provided between the pay-off device and the coating tank, and between the take-up device and the coating tank, are either independent or integrated with the pay-off device / take-up device.

[0011] Furthermore, the liquid conductive medium is a liquid metal.

[0012] This invention takes into account the long coating area in the continuous electrocoating device for metal wires, which corresponds to high resistance of long wires. Therefore, by adding a conductive device to the continuous electrocoating device and designing symmetrical negative electrodes and multiple negative electrodes, the current distribution of the product can be improved, preventing localized high current density. This prevents coating scorching and hydrogen porosity caused by high current density, thus improving the density of the coating. At the same time, the uniform current distribution can also increase the coating speed, improve the current conversion efficiency, reduce the hydrogen content in the coating, lower the finished coating voltage, and save energy. Attached Figure Description

[0013] The embodiments of this utility model will be further described below with reference to the accompanying drawings, wherein:

[0014] Figure 1 A schematic diagram of the continuous electrocoating device for metal wires in Example 2 is shown;

[0015] Figure 2 A cross-sectional schematic diagram of the conductive device is shown;

[0016] Figure 3 The electrode current conditions of each segment in Example 1 are shown;

[0017] Figure 4 The electrode current conditions for each segment in Example 2 are shown.

[0018] Among them, 1-paying device, 2-coating groove, 3-power supply, 4-conductive device, 5-retracting device, 6-metal wire, 41-shell, 42-metal stator, 43-liquid conductive medium, 44-metal rotor, and 45-metal wheel. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0020] Example 1

[0021] A continuous electrocoating device for metal wire includes: a wire feeding device 1, a wire take-up device 5, a coating groove 2, a power supply 3, a coating anode, and a conductive device 4. The coating anode is sheet-shaped. The wire feeding device 1 and the wire take-up device 5 are located at both ends of the coating groove 2. A conductive device 4 is provided between the wire feeding device 1 and the coating groove 2, and between the wire take-up device 5 and the coating groove 2. The conductive devices 4 are symmetrically arranged about the coating groove 2. Each conductive device 4 includes a housing 41, a metal stator 42, a liquid conductive medium 43, a metal rotor 44, and a metal wheel 45. One end of the metal stator 42 is fixed inside the housing 41. One end of the rotor 44 is rotatably connected to the housing 41 via a bearing, and the other end is fixed with a metal wheel 45. The space between the metal stator 42 and the metal rotor 44 is filled with a liquid conductive medium 43 - liquid metal. The metal wire 6 is wound sequentially on the spool of the wire feeding device 1, the metal wheel 45 of the conductive device 4, and the spool of the wire taking device 5. The spool drives the metal wire 6 to move. The metal wire 6 passes through the coating tank 2 and is completely immersed in the coating liquid in the coating tank. The metal stators 42 of the two conductive devices 4 are respectively connected to the negative terminal of the power supply 3, and the coating anode in the coating tank is connected to the positive terminal of the power supply 3. The conductive devices 4 are independent.

[0022] The unwinding and take-up devices are located at both ends of the coating tank. The unwinding device unwinds the coated wire wound on the spool, while the take-up device winds the wire that has passed through the coating tank onto the take-up spool. The wire should be under tension to prevent bending and straightening. The wire is completely immersed in the coating solution in the coating tank and connected to a symmetrical conductive device connected to the negative terminal of the coating power circuit. The anode in the coating tank is connected to the positive terminal of the power supply. Under the influence of the potential between the anode and the cathode of the wire in the coating tank, metal ions in the coating solution gradually deposit onto the surface of the wire. To achieve a balanced current on the wire, the negative terminal of the power supply connected to the wire is designed symmetrically to avoid excessive local current in the wire, which could cause burning or hydrogen porosity. Figure 3 It can be seen that the current difference is smaller at different points in the device after symmetrical design, while the current in the single negative pole device is larger closer to the take-up end.

[0023] Example 2

[0024] The overall structure is similar to that of Embodiment 1, except that multiple evenly spaced coating grooves 2 are provided, specifically three coating grooves 2, as shown in the attached figure. Figure 1 As shown, a conductive device 4 is also provided between adjacent coating grooves. The conductive device 4 is located in the middle of the adjacent coating grooves 24, and the two adjacent conductive devices 4 are symmetrical about the middle coating groove 2.

[0025] From the appendix Figure 4 It can be seen that the current difference is smaller at different points in the device after symmetrical design, while the current in the single negative pole device is larger closer to the take-up end.

[0026] The foregoing description describes some exemplary embodiments of this utility model. It is understood that the above embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model. The features in these embodiments can be recombine in a suitable manner, and the resulting solutions are still within the scope of protection claimed by this utility model. Based on the above embodiments, all other embodiments obtained by those skilled in the art without inventive effort, that is, all modifications, equivalent substitutions, and improvements made within the spirit and principles of this application, fall within the scope of protection claimed by this utility model.

Claims

1. A continuous electrocoating device for metal wires, characterized in that, include: The device comprises a wire feeding device (1), a wire taking-up device (5), a coating tank (2), a power supply (3), a coating anode, and a conductive device (4); the wire feeding device (1) and the wire taking-up device (5) are located at both ends of the coating tank (2); a conductive device (4) is provided between the wire feeding device (1) and the coating tank (2), and between the wire taking-up device (5) and the coating tank (2). The conductive device (4) is symmetrically arranged about the coating tank (2). The conductive device (4) includes a housing (41), a metal stator (42), a liquid conductive medium (43), a metal rotor (44), and a metal wheel (45). One end of the metal stator (42) is fixed to the housing (41). Inside the casing (41), one end of the metal rotor (44) is rotatably connected to the casing (41), and the other end is fixed with a metal wheel (45). The space between the metal stator (42) and the metal rotor (44) is filled with a liquid conductive medium (43). The metal wire (6) is wound sequentially on the spool of the wire feeding device (1), the metal wheel (45) of the conductive device (4), and the spool of the wire taking device (5). The spool drives the metal wire (6) to move. The metal wire (6) passes through the coating tank (2) and is completely immersed in the coating liquid in the coating tank. The metal stator (42) of the conductive device (4) is connected to the negative terminal of the power supply (3), and the coating anode in the coating tank is connected to the positive terminal of the power supply (3).

2. The continuous electrocoating device for metal wires according to claim 1, characterized in that, It contains multiple coating grooves (2), and conductive devices (4) are also provided between adjacent coating grooves. The conductive devices (4) on both sides of each coating groove are symmetrical about the coating groove.

3. The continuous electrocoating device for metal wires according to claim 1, characterized in that, The coated anode is in sheet or C-shaped cylindrical form.

4. The continuous electrocoating device for metal wires according to claim 1, characterized in that, One end of the metal rotor (44) is rotatably connected to the housing (41) via a bearing.

5. The continuous electrocoating device for metal wires according to claim 1, characterized in that, The conductive device (4) provided between the wire feeding device (1) and the coating groove (2), and between the wire taking-up device (5) and the coating groove (2), is either independent or integrated with the wire feeding device (1) / wire taking-up device (5).

6. The continuous electrocoating device for metal wires according to claim 1, characterized in that, The liquid conductive medium (43) is a liquid metal.

Images