A continuous nickel plating device

Abstract

The utility model provides a kind of continuous nickel plating device, including multistage nickel plating mechanism and multistage annealing mechanism connected in turn, the multistage nickel plating mechanism includes electrolytic alkaline cleaning tank, electrolytic pickling tank and several nickel plating wells connected in turn, so that workpiece is sequentially subjected to alkaline cleaning treatment by electrolytic alkaline cleaning tank, after pickling treatment by electrolytic pickling tank, into nickel plating well and carries out nickel plating;The last stage nickel plating well is connected with plating solution recovery component, for cleaning workpiece to obtain recycled plating solution, the recycled plating solution is added in each stage nickel plating well in the form of process make-up water;The utility model can improve the nickel plating effect of workpiece, reduce the plating solution loss of nickel plating process, and increase the annealing effect of steel.

Description

Technical Field

[0001] This utility model relates to the field of steel processing equipment, and in particular to a continuous nickel plating device. Background Technology

[0002] To ensure the performance of steel, steel is usually nickel-plated and annealed. Nickel-plated steel strips are widely used in the manufacture of lithium battery casings. However, existing nickel-plated steel strips generally suffer from poor adhesion between the plating layer and the substrate during the preparation process, which increases the complexity of the nickel plating process. At the same time, before entering the annealing process, the workpiece usually needs to be cleaned to ensure the removal of residual plating solution from the workpiece surface. However, existing rinsing equipment directly generates waste liquid, increasing the loss of plating solution.

[0003] Furthermore, current annealing processes only involve one stage of annealing, resulting in poor annealing effects. After electroplating nickel onto the steel, the softening temperatures of the nickel layer and the steel differ, making it difficult to perform proper annealing on the steel with the nickel layer within the same annealing mechanism. Utility Model Content

[0004] The purpose of this invention is to provide a continuous nickel plating apparatus that can improve the nickel plating effect of workpieces, reduce the loss of plating solution in the nickel plating process, and enhance the annealing effect of steel.

[0005] To solve the above-mentioned technical problems, this utility model provides a continuous nickel plating device, including a multi-stage nickel plating mechanism and a multi-stage annealing mechanism connected in sequence. The multi-stage nickel plating mechanism includes an electrolytic alkaline washing tank, an electrolytic acid washing tank, and a number of nickel plating wells connected in sequence, so that the workpiece is subjected to alkaline washing treatment in the electrolytic alkaline washing tank and acid washing treatment in the electrolytic acid washing tank before entering the nickel plating well for nickel plating. The final nickel plating well is connected to a plating solution recovery component for cleaning the workpiece to obtain recovered plating solution, which is added to each stage of the nickel plating well in the form of process water.

[0006] Furthermore, a brushing component, a first rinsing component, and a hot air drying component are sequentially connected between the electrolytic alkaline washing tank and the electrolytic acid washing tank, so that the brushing component brushes the workpiece surface with a degreasing agent solution, the first rinsing component rinses the workpiece surface with residual degreasing agent solution, and the hot air drying component removes residual liquid from the workpiece surface.

[0007] Furthermore, a second rinsing component and a water washing component are sequentially connected between the electrolytic pickling tank and the nickel plating well, so that the second rinsing component rinses the acid residue on the workpiece surface, and the water washing component sprays and rinses the workpiece surface.

[0008] Furthermore, a third rinsing component and a high-pressure spray rinsing component are sequentially connected between the plating solution recovery component and the multi-stage annealing mechanism, so that the third rinsing component is used to rinse the plating solution remaining on the workpiece surface, and the high-pressure spray rinsing component is used to remove the rinsing waste liquid from the workpiece surface.

[0009] Furthermore, the multi-stage nickel plating mechanism also includes an uncoiler and a welding machine. After the workpiece in coil form is uncoiled by the uncoiler, the beginning and end of two adjacent workpieces are connected by the welding machine so that the workpieces can continuously enter the electrolytic alkaline washing tank.

[0010] Furthermore, the multi-stage annealing mechanism includes a primary annealing mechanism and a secondary annealing mechanism connected in sequence. The primary annealing mechanism and the secondary annealing mechanism are connected by a connecting chamber, so that after the workpiece is annealed by the primary annealing mechanism, the connecting chamber transports the workpiece to the secondary annealing mechanism for secondary annealing.

[0011] Furthermore, the connecting chamber is connected to the first-stage annealing mechanism via a first pipeline, and the connecting chamber is connected to the second-stage annealing mechanism via a second pipeline. This allows the hot air from the first-stage annealing mechanism to enter the connecting chamber via the first pipeline and then enter the second-stage annealing mechanism via the second pipeline when the first-stage annealing mechanism is cooling down, so that the connecting chamber and the second-stage annealing mechanism can be preheated.

[0012] Furthermore, a replacement chamber is provided on one side of the connecting chamber, and the replacement chamber has the same structure as the connecting chamber, so that when the connecting chamber is being maintained, the replacement chamber is connected to the primary annealing mechanism and the secondary annealing mechanism through the first pipeline and the second pipeline.

[0013] Furthermore, the bottom of the connecting chamber and the replacement chamber are laid with tracks, and both the connecting chamber and the replacement chamber can move along the tracks. The connecting chamber has several rotating rollers arranged in sequence inside, and the workpiece is transported by the rotating rollers.

[0014] Furthermore, the upper temperature limit of the primary annealing mechanism is higher than that of the secondary annealing mechanism.

[0015] The beneficial effects of this utility model are as follows: the workpiece passes through a multi-stage nickel plating mechanism and a multi-stage annealing mechanism in sequence, so that the workpiece can be treated by alkaline washing in an electrolytic alkaline washing tank to reduce the grease on the surface of the workpiece. Then, it is treated by acid washing in an electrolytic acid washing tank to dissolve the oxide film on the surface of the workpiece and expose the active iron substrate, thereby improving the bonding force between the electroplated nickel layer and the iron substrate. With the help of several continuously set nickel plating wells, the stability and uniformity of the nickel plating layer on the surface of the workpiece can be guaranteed.

[0016] Meanwhile, due to the installation of the plating solution recovery unit, after the workpiece is nickel plated, the surface of the workpiece can be cleaned by the plating solution recovery unit to obtain the recovered plating solution. The recovered plating solution can then be replenished to each level of nickel plating well in the form of process water, which can effectively reduce the degree of plating solution loss. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the multi-stage nickel plating mechanism in this utility model.

[0019] Figure 3 This is the multi-stage annealing mechanism in this utility model.

[0020] Figure 4 This is a schematic diagram of the connection structure between the connecting compartment and the replacement compartment in this utility model.

[0021] Reference numerals: 1. Multi-stage nickel plating mechanism; 11. Electrolytic alkaline washing tank; 12. Electrolytic acid washing tank; 13. Nickel plating well; 14. Plating solution recovery unit; 15. Brushing unit; 16. First rinsing unit; 17. Hot air drying unit; 18. Second rinsing unit; 19. Water washing unit; 110. Third rinsing unit; 111. High-pressure spray rinsing unit; 112. Uncoiler; 113. Welding machine; 2. Multi-stage annealing mechanism; 21. First-stage annealing mechanism; 22. Second-stage annealing mechanism; 23. Connecting chamber; 24. First pipeline; 25. Second pipeline; 26. Changing chamber; 27. Track. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0023] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation of this utility model.

[0024] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0025] like Figures 1-4 The present invention provides a continuous nickel plating apparatus, comprising a multi-stage nickel plating mechanism 1 and a multi-stage annealing mechanism 2 connected in sequence. The multi-stage nickel plating mechanism 1 includes an electrolytic alkaline washing tank 11, an electrolytic acid washing tank 12, and a plurality of nickel plating wells 13 connected in sequence, so that the workpiece is subjected to alkaline washing treatment in the electrolytic alkaline washing tank 11 and acid washing treatment in the electrolytic acid washing tank 12 in sequence, and then enters the nickel plating wells 13 for nickel plating. The last nickel plating well 13 is connected to a plating solution recovery component 14 for cleaning the workpiece to obtain recovered plating solution, which is added to each stage of the nickel plating wells 13 in the form of process water replenishment.

[0026] The workpiece passes through a multi-stage nickel plating mechanism and a multi-stage annealing mechanism in sequence. The workpiece can be treated with alkaline washing in an electrolytic alkaline washing tank to reduce the grease on the surface of the workpiece. Then it is treated with acid washing in an electrolytic acid washing tank to dissolve the oxide film on the surface of the workpiece and expose the active iron substrate, thereby improving the adhesion between the electroplated nickel layer and the iron substrate. With the help of several continuously set nickel plating wells, the stability and uniformity of the nickel plating layer on the surface of the workpiece can be guaranteed.

[0027] Meanwhile, due to the installation of the plating solution recovery unit, after the workpiece is nickel plated, the surface of the workpiece can be cleaned by the plating solution recovery unit to obtain the recovered plating solution. The recovered plating solution can then be replenished to each level of nickel plating well in the form of process water, which can effectively reduce the degree of plating solution loss.

[0028] In this scheme, the workpiece can be steel strip. A 5% degreasing agent solution is used in the electrolytic alkaline washing tank to clean the surface of the steel strip, mainly removing grease. The main components of the degreasing agent are sodium hydroxide and surfactant. The alkaline washing tank solution needs to be replaced after a period of use. In the electrolytic acid washing tank, the steel strip is passed through a 5% sulfuric acid solution, while electrodes placed on both sides of the steel strip in the solution tank perform electrolytic acid washing. This dissolves the oxide film on the surface of the steel strip, exposing the active iron substrate, to ensure the adhesion of the electroplated nickel layer to the iron substrate. The bonding force of the body is such that after a period of use, the iron ion concentration in the plating bath increases and needs to be replaced, which will generate concentrated acid waste liquid. In the nickel plating well, the steel strip is immersed in the metallic nickel salt solution as the cathode and the metallic nickel plate is used as the anode. After connecting the DC power supply, a metallic nickel plating layer is deposited on the surface of the steel strip. The electroplating solution used consists of 5% nickel chloride, 5% boric acid and 30% nickel sulfate. The anode uses a titanium basket to load nickel blocks. The nickel plating bath is maintained by continuous filtration and purification. The plating solution is recycled and replenished quantitatively, and no waste liquid is generated.

[0029] The plating solution recovery unit includes a welded steel vertical tank equipped with a guide roller. After the workpiece is electroplated in the plating solution tank, it is rinsed sequentially from the primary recovery tank to the final recovery tank. Demineralized water is sprayed from the final recovery tank in the form of atomized spray. After the workpiece is rinsed out of a certain recovery tank, it is sprayed with demineralized water from the next recovery tank. The sprayed water enters the tank of that stage to rinse the steel strip. At the same time, guide rollers are installed, which are equipped with pressure rollers to squeeze the surface of the steel strip dry, thereby further reducing the loss of steel strip carried out. Water from the recovery tank is periodically added to the plating solution tank as process water for plating.

[0030] It is worth mentioning that the transfer of workpieces between each stage of the process in this solution can be carried out by transmission rollers.

[0031] Preferably, a brushing component 15, a first rinsing component 16, and a hot air drying component 17 are sequentially connected between the electrolytic alkaline washing tank 11 and the electrolytic acid washing tank 12, so that the brushing component 15 brushes the workpiece surface with a degreasing agent solution, the first rinsing component 16 rinses the workpiece surface with residual degreasing agent solution, and the hot air drying component 17 removes residual liquid from the workpiece surface.

[0032] Specifically, the washing components are equipped with a horizontal welded carbon steel trough, which contains one pair of alkaline washing brush rollers and one pair of water washing brush rollers. The brush rollers are driven by a motor. A pair of squeeze rollers are installed at the inlet and outlet of the carbon steel trough and between the two pairs of brushes. The upper squeeze rollers are pressed down by a cylinder. The alkaline solution used for washing is a degreasing agent solution, and the water used is fresh water, which is used in a spraying manner, recycled, and replaced regularly.

[0033] The first rinsing component uses desalinated water to rinse the steel strip via spraying, in order to remove residual degreasing agent solution from the surface of the steel strip. The spraying water is recycled and replaced periodically.

[0034] The hot air drying unit is installed on a vertical channel and uses hot air to dry the surface of the strip steel. The air is heated by a steam heater and then blown onto the surface of the strip steel by a blower.

[0035] Preferably, a second rinsing component 18 and a water washing component 19 are sequentially connected between the electrolytic pickling tank 12 and the nickel plating well 13, so that the second rinsing component 18 rinses the acid residue on the surface of the workpiece, and the water washing component 19 sprays and rinses the surface of the workpiece.

[0036] Specifically, the second rinsing component uses demineralized water from the subsequent washing process to rinse the activated steel strip in a counter-current spray manner. At the same time, the spray water enters the tank to further rinse the steel strip to remove residual acid on the surface of the steel strip, which will generate low-concentration acidic wastewater.

[0037] The water washing component uses a desalinated water counter-current spray method to further clean the rinsed steel strip. At the same time, the sprayed water enters the tank to further rinse the steel strip to remove residual rinsing waste liquid on the surface of the steel strip, in preparation for the next step of electroplating. The rinsing water generated in this process is recycled to the process of the second rinsing component.

[0038] Preferably, a third rinsing component 110 and a high-pressure spray rinsing component 111 are sequentially connected between the plating solution recovery component 14 and the multi-stage annealing mechanism 2, so that the third rinsing component 110 is used to rinse the plating solution remaining on the surface of the workpiece, and the high-pressure spray rinsing component 111 is used to remove the rinsing waste liquid from the surface of the workpiece.

[0039] Specifically, the third rinsing component uses desalinated water from the subsequent rinsing process to further clean the surface of the steel strip by counter-current spray rinsing. At the same time, the spray water enters the tank to further rinse the steel strip and remove residual plating solution. This process generates nickel-containing wastewater.

[0040] The high-pressure spray rinsing component uses a demineralized water counter-current spray rinsing method to further clean the surface of the steel strip and remove residual rinsing waste liquid. At the same time, the spray water enters the tank to further rinse the steel strip. The rinsing water generated in this process is reused in the process of the third rinsing component in the previous stage.

[0041] Preferably, the multi-stage nickel plating mechanism 1 further includes an uncoiler 112 and a welding machine 113. After the workpiece in coil form is uncoiled by the uncoiler 112, the beginning and end ends of two adjacent workpieces are connected by the welding machine 113 so that the workpieces continuously enter the electrolytic alkaline washing tank 11.

[0042] Specifically, the uncoiler is used to load raw material rolls and unwind them, and its specific unwinding process is consistent with existing technology.

[0043] The welding machine is used to connect the front and rear steel strips together. The welding is carried out by a butt welding machine, which produces virtually no waste gas.

[0044] It is worth mentioning that after the welding machine finishes welding the steel strip and the steel strip is transferred to the electrolytic alkaline washing tank, the steel strip needs to pass through the inlet looper so that the steel strip is stored at the inlet looper, which plays a buffering role and ensures the continuous operation of the production line. At the same time, an outlet looper and an inlet looper are also installed between the discharge position of the high-pressure spray washing component and the feeding position of the multi-stage annealing mechanism to further ensure the continuous operation of the production line.

[0045] Preferably, the multi-stage annealing mechanism 2 includes a primary annealing mechanism 21 and a secondary annealing mechanism 22 connected in sequence. The primary annealing mechanism 21 and the secondary annealing mechanism 22 are connected by a connecting chamber 23 so that after the workpiece is annealed by the primary annealing mechanism 21, the workpiece is transported by the connecting chamber 23 to the secondary annealing mechanism 22 for secondary annealing.

[0046] Specifically, because this solution has a primary annealing mechanism and a secondary annealing mechanism, the steel can undergo two consecutive annealing processes, increasing the annealing effect. For hard steel, the two annealing processes can transform the substrate from a hard state to a soft state, and the nickel from a hard state to a soft state. Testing the adhesion between the two can effectively increase the ductility and bonding strength of the nickel layer on the steel. This dual-stage annealing structure can also be used to study the effects of continuous annealing temperature and dwell time on the alloy layer thickness, the effects of over-aging temperature and dwell time on the properties of the steel strip, the changes in the properties of the alloy layer and steel strip after continuous annealing of a soft substrate, the changes in the properties of the alloy layer and steel strip after continuous annealing of a hard substrate, and the changes in the hardness and ductility of the nickel plating layer after annealing.

[0047] In addition, due to the setting of the connecting chamber, the steel can be kept warm and preheated through the connecting chamber when it enters the secondary annealing mechanism from the primary annealing mechanism, so as to avoid heat loss and increase the preheating effect.

[0048] The annealing process in the primary and secondary annealing mechanisms is the same as the existing annealing methods and has the same structure, so it will not be described in detail here.

[0049] In one embodiment of this solution, the connecting chamber 23 is equipped with several sequentially arranged rotating rollers. The workpiece is transported via these rollers. Gates are provided at the connection points between the connecting chamber and the primary annealing mechanism and between the connecting chamber and the secondary annealing mechanism. The opening and closing of the gates are controlled by a hydraulic system so that the primary and secondary annealing mechanisms can be insulated from each other during heating and cooling.

[0050] It is worth mentioning that several rollers are controlled by the same motor, and the ends of the rollers are connected to transmission equipment such as chains and synchronous belts, so that the rollers can be driven synchronously by the same motor, thereby transporting the steel on the rollers.

[0051] In another embodiment of this scheme, the upper temperature limit of the primary annealing mechanism 21 is higher than that of the secondary annealing mechanism 22, which makes the annealing effect of the steel better, so as to eliminate coating stress, soften the nickel layer, increase the bonding force and improve the ductility of the nickel layer, while obtaining the corrosion resistance of the nickel-iron alloy diffusion layer.

[0052] Preferably, the interior of the connecting chamber 23 is connected to the interior of the primary annealing mechanism 21 via the first pipe 24, and the interior of the connecting chamber 23 is connected to the interior of the secondary annealing mechanism 22 via the second pipe 25. This allows the hot air inside the primary annealing mechanism 21 to enter the connecting chamber 23 via the first pipe 24 and then enter the secondary annealing mechanism 22 via the second pipe 25 when the primary annealing mechanism 21 is cooling down, so that the connecting chamber 23 and the secondary annealing mechanism 25 are preheated.

[0053] Specifically, during the cooling process in the primary annealing unit, a portion of the high-temperature gas from the primary annealing unit is transported to the connecting chamber through the first pipeline, thereby raising the temperature inside the connecting chamber. This ensures that when the steel subsequently enters the secondary annealing unit through the connecting chamber, it can be preheated, increasing the efficiency of the subsequent secondary heating. Simultaneously, when the high-temperature gas is input from the connecting chamber into the secondary annealing unit through the second pipeline, it can preheat the interior of the secondary annealing unit, allowing the secondary annealing unit to reach the set temperature more quickly when the steel is transported there.

[0054] Preferably, a replacement chamber 26 is provided on one side of the connecting chamber 23, and the replacement chamber 26 has the same structure as the connecting chamber 23, so that when the connecting chamber 23 is being maintained, the replacement chamber 26 is connected to the primary annealing mechanism 21 and the secondary annealing mechanism 22 through the first pipeline 24 and the second pipeline 25.

[0055] Specifically, since the connecting chamber is connected between the two annealing mechanisms, the roller conveying equipment and pipelines inside it are quite important. Therefore, in order to ensure the stable use of the connecting chamber, it is necessary to perform regular maintenance and inspection. During maintenance and inspection, the replacement chamber can be swapped with the connecting chamber, and the replacement chamber can be used to transport steel between the two annealing mechanisms. This allows the connecting chamber to be maintained regularly without affecting the annealing efficiency of the steel.

[0056] Preferably, the bottom of the connecting compartment 23 and the replacement compartment 26 are provided with a track 27, and both the connecting compartment 23 and the replacement compartment 26 can move along the track 27.

[0057] Specifically, by moving the connecting bin and the replacement bin synchronously along the track, when the connecting bin moves away from the annealing mechanism, the replacement bin moves to the transportation position between the two annealing mechanisms, thereby ensuring the stability and continuity of steel transportation.

[0058] It is worth mentioning that the first and second pipelines are connected to the connecting compartment using detachable methods such as bolted or threaded connections. The first and second pipelines are also connected to the replacement compartment using the same detachable method, so as to ensure that the first and second pipelines can be connected to the replacement compartment when the connecting compartment is being maintained.

[0059] This utility model is not limited to the above-described preferred embodiments. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made in their shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this utility model.

Claims

1. A continuous nickel plating apparatus, characterized in that: The system includes a multi-stage nickel plating mechanism (1) and a multi-stage annealing mechanism (2) connected in sequence. The multi-stage nickel plating mechanism (1) includes an electrolytic alkaline washing tank (11), an electrolytic acid washing tank (12), and a number of nickel plating wells (13) connected in sequence, so that the workpiece is subjected to alkaline washing in the electrolytic alkaline washing tank (11) and acid washing in the electrolytic acid washing tank (12) in sequence, and then enters the nickel plating well (13) for nickel plating. The last nickel plating well (13) is connected to a plating solution recovery component (14) for cleaning the workpiece to obtain the recovered plating solution. The recovered plating solution is added to each stage of the nickel plating well (13) in the form of process water.

2. The continuous nickel plating apparatus according to claim 1, characterized in that: The electrolytic alkaline washing tank (11) and the electrolytic acid washing tank (12) are connected in sequence by a brushing component (15), a first rinsing component (16), and a hot air drying component (17), so that the brushing component (15) brushes the surface of the workpiece with a degreasing agent solution, the first rinsing component (16) rinses the surface of the workpiece with the degreasing agent solution remaining on the surface of the workpiece, and the hot air drying component (17) is used to remove the residual liquid on the surface of the workpiece.

3. The continuous nickel plating apparatus according to claim 1, characterized in that: The electrolytic pickling tank (12) and the nickel plating well (13) are connected in sequence to a second rinsing component (18) and a water washing component (19), so that the second rinsing component (18) rinses the acid residue on the surface of the workpiece, and the water washing component (19) sprays and rinses the surface of the workpiece.

4. The continuous nickel plating apparatus according to claim 1, characterized in that: The plating solution recovery unit (14) and the multi-stage annealing mechanism (2) are connected in sequence by a third rinsing unit (110) and a high-pressure spray rinsing unit (111), so that the third rinsing unit (110) is used to rinse the plating solution remaining on the surface of the workpiece, and the high-pressure spray rinsing unit (111) is used to remove the rinsing waste liquid on the surface of the workpiece.

5. The continuous nickel plating apparatus according to claim 1, characterized in that: The multi-stage nickel plating mechanism (1) also includes an uncoiler (112) and a welding machine (113). After the workpiece in coil form is uncoiled by the uncoiler (112), the beginning and end ends of two adjacent workpieces are connected by the welding machine (113) so that the workpieces continuously enter the electrolytic alkaline washing tank (11).

6. The continuous nickel plating apparatus according to claim 1, characterized in that: The multi-stage annealing mechanism (2) includes a first-stage annealing mechanism (21) and a second-stage annealing mechanism (22) connected in sequence. The first-stage annealing mechanism (21) and the second-stage annealing mechanism (22) are connected by a connecting chamber (23) so that after the workpiece is annealed by the first-stage annealing mechanism (21), the connecting chamber (23) transports the workpiece to the second-stage annealing mechanism (22) for secondary annealing.

7. The continuous nickel plating apparatus according to claim 6, characterized in that: The connecting chamber (23) is connected to the first-stage annealing mechanism (21) via the first pipe (24), and the connecting chamber (23) is connected to the second-stage annealing mechanism (22) via the second pipe (25). When the first-stage annealing mechanism (21) is cooling down, the hot air inside the first-stage annealing mechanism (21) enters the connecting chamber (23) via the first pipe (24) and then enters the second-stage annealing mechanism (22) via the second pipe (25) so that the connecting chamber (23) and the second-stage annealing mechanism (22) are preheated.

8. The continuous nickel plating apparatus according to claim 7, characterized in that: A replacement chamber (26) is provided on one side of the connecting chamber (23), and the replacement chamber (26) has the same structure as the connecting chamber (23) so that when the connecting chamber (23) is being maintained, the replacement chamber (26) is connected to the first-stage annealing mechanism (21) and the second-stage annealing mechanism (22) through the first pipeline (24) and the second pipeline (25).

9. The continuous nickel plating apparatus according to claim 8, characterized in that: The bottom of the connecting chamber (23) and the changing chamber (26) is laid with a track (27), and both the connecting chamber (23) and the changing chamber (26) can move along the track (27). The connecting chamber (23) has a number of rotating rollers arranged in sequence, and the workpiece is transported by the number of rotating rollers.

10. The continuous nickel plating apparatus according to claim 6, characterized in that: The upper temperature limit of the primary annealing mechanism (21) is higher than the upper temperature limit of the secondary annealing mechanism (22).

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