Thyristor shell nickel plating device and using method thereof

Abstract

The invention relates to the field of electroplating equipment, in particular to a thyristor shell nickel plating device and a using method thereof.The thyristor shell nickel plating device comprises a nickel plating pool, an electroplating frame is vertically arranged on the nickel plating pool in a sliding mode, a lifting piece for driving the electroplating frame to vertically slide is arranged on the nickel plating pool, and a water sinking frame is arranged on the electroplating frame; a plurality of shell placing mechanisms for placing tube shells are uniformly distributed on the water sinking frame, each shell placing mechanism comprises a branch pipe arranged on the water sinking frame, a bearing plate is coaxially arranged on each branch pipe, and a first electrifying supporting rod and a second electrifying supporting rod which are the same in structure are vertically and slidably arranged on each bearing plate; the multiple first electrified supporting rods and the multiple second electrified supporting rods are evenly distributed in the circumferential direction of the axis of the supporting pipe and are sequentially arranged in a staggered mode, the pipe shell is used for being placed on the tops of the first electrified supporting rods or the tops of the second electrified supporting rods, a jacking assembly is arranged on the supporting pipe, and a power supply part is arranged on the electroplating frame. The electroplating device has the effect of improving the electroplating quality of the tube shell.

Description

Technical Field

[0001] This application relates to the field of electroplating equipment, and in particular to a nickel plating apparatus for thyristor casings and its method of use. Background Technology

[0002] A thyristor is a high-power semiconductor device, also known as a silicon controlled rectifier (SCR). It has functions such as controlled rectification and contactless switching and is widely used in the field of power electronics. The thyristor's casing, as the packaging carrier, not only undertakes mechanical support and electrical connection functions, but also needs to meet the requirements of heat dissipation, insulation and environmental protection.

[0003] Nickel plating of thyristor casings is an important protective method for rust prevention. The plated part (the casing is made of metal) and the mounting bracket conduct electricity through physical contact. Due to the tight metal contact between the plated part and the mounting bracket, a conductive path is formed. However, this area is blocked by the mounting bracket itself, causing the current to not reach the surface of the contact surface evenly. The deposition of the electroplating layer requires metal ions in the electrolyte to obtain electrons and be reduced on the cathode (plated part) surface. However, because the contact point is blocked by the mounting bracket, the ions cannot diffuse freely to this area, thus forming a "shielding dead angle" on the surface of the plated part. This may leave bare traces of no plating at the contact point of the plated part after the mounting bracket is removed (i.e., "mount mark"), which greatly affects the appearance and corrosion resistance of the plated part and has shortcomings. Summary of the Invention

[0004] To address the issue of plating interruptions occurring at conductive points between the plated parts and the mounting fixtures, this application provides a nickel plating apparatus for thyristor housings and its usage method.

[0005] Firstly, the thyristor casing nickel plating apparatus provided in this application adopts the following technical solution: A nickel plating apparatus for thyristor casings includes a nickel plating tank, an electroplating rack vertically slidably mounted on the nickel plating tank, a lifting component for driving the electroplating rack to slide vertically on the nickel plating tank, a submersible rack on the electroplating rack, and multiple casing placement mechanisms evenly distributed on the submersible rack for placing the casings. Each casing placement mechanism includes a branch pipe mounted on the submersible rack, a support plate coaxially mounted on the branch pipe, and a first energized support rod and a second energized support rod with identical structures vertically slidably mounted on the support plate. Multiple first and second energized support rods are evenly distributed circumferentially along the axis of the branch pipe. The first and second energized support rods are arranged alternately. The pipe shell is used to place on the top of the first or second energized support rod. A top support assembly is provided on the branch pipe. The top support assembly is used to drive the first and second energized support rods to slide back and forth alternately. A power supply component is provided on the electroplating rack. The power supply component is used to supply power to the first or second energized support rod.

[0006] By adopting the above technical solution, the worker first places the thyristor shell on the support plate. At this time, the shell is supported by multiple first energized support rods. The lifting component drives the electroplating rack to slide vertically downward, so that the submersible rack and the support plate are immersed in the electroplating solution in the nickel plating bath. Then, the power supply component supplies power to the first energized support rods. After a period of time, a layer of metallic nickel is electroplated on the surface of the shell. Subsequently, the supporting component drives the first and second energized support rods to slide back and forth alternately, so that multiple second energized support rods support the shell. Then, the power supply component supplies power to the second energized support rods. After a period of time, a layer of metallic nickel is electroplated on the surface of the shell again. The above process is repeated until the nickel layer on the surface of the shell meets the requirements of the composite product. In this way, the surface of the shell is electroplated evenly, reducing the impact of the "shielding dead corner" on the surface plating of the shell, thereby improving the appearance and corrosion resistance of the shell.

[0007] Optionally, the lifting component includes a lifting cylinder disposed next to the nickel plating tank and electrically connected to the control system, and the electroplating rack is disposed on the piston rod of the lifting cylinder.

[0008] By adopting the above technical solution, the control system starts the lifting cylinder, the piston rod of the lifting cylinder retracts, and the piston rod of the lifting cylinder drives the electroplating rack to descend, and the electroplating rack drives the tube shell on the submersible rack to be immersed in the electroplating solution of the nickel plating tank.

[0009] Optionally, the top support assembly includes a protective sleeve coaxially disposed at the bottom of the support plate. The protective sleeve is hollow inside and open at the top. The branch pipe passes through the bottom of the protective sleeve. Insulating rods are provided at the bottom of the first and second energized support rods. The insulating rods slide vertically through the bottom of the protective sleeve. A round rod is provided on the insulating rod at the bottom of the protective sleeve. An intermediate disk is coaxially disposed on the branch pipe below the protective sleeve. A rod-changing tube is rotatably disposed on the intermediate disk. A rotating component is provided on the branch pipe to drive the rod-changing tube to rotate. Multiple V-shaped drive slots are evenly opened on the rod-changing tube along its axis. The number of drive slots is half the number of round rods. The round rods slide in cooperation with the drive slots. When the round rod at the bottom of the first energized support rod abuts against the drive slot, the round rod at the bottom of the second energized support rod abuts against the top of the rod-changing tube.

[0010] By adopting the above technical solution, the rotating component drives the changing rod tube to rotate. The rotating changing rod tube pushes the round rod corresponding to the second energized support rod to gradually slide out of the driving slot through the inclined driving slot, while the round rod corresponding to the first energized support rod will gradually slide into the driving slot. During this process, the tube shell is smoothly replaced from the top of the first energized support rod to the top of the second energized support rod. The "shielding dead angle" between the tube shell and the top of the first energized support rod will be electroplated and repaired after the second energized support rod is energized, thereby reducing the impact of the "shielding dead angle" on the tube shell.

[0011] Optionally, the rotating component includes a base tube coaxially disposed at the bottom of the intermediate disk, the base tube being sleeved on the branch tube, and a gap existing between the inner circumferential sidewall of the base tube and the outer circumferential sidewall of the branch tube. A drive ring is coaxially disposed at the bottom of the rod-changing tube, and a gap exists between the inner circumferential sidewall of the drive ring and the outer circumferential sidewall of the branch tube. A liquid inlet is opened between the inner and outer sides of the base tube, communicating with the inner side of the drive ring. Multiple injection ports are opened between the inner and outer sides of the drive ring. The injection nozzles are evenly distributed circumferentially along the axis of the drive ring. The axis of the injection nozzle is inclined to the axis of the branch pipe. A tray is coaxially arranged on the base pipe, and the tray abuts against the bottom of the drive ring. A liquid supply pipe is arranged on the electroplating rack. A connecting pipe is connected between the liquid supply pipe and the inner side wall of the base pipe. A water pump electrically connected to the control system is arranged next to the nickel plating tank. The liquid inlet end of the water pump is connected to the bottom of the nickel plating tank through a liquid inlet pipe. A flexible hose is connected between the liquid supply pipe and the liquid outlet end of the water pump.

[0012] By adopting the above technical solution, the control system starts the water pump, which supplies electroplating solution into the supply pipe through the inlet pipe and the hose. The electroplating solution in the supply pipe flows into the inner side of the drive ring in the order of connecting pipe, base pipe and liquid inlet, and then sprays out from the spray nozzle on the drive ring. The reaction force of the electroplating solution sprayed out of the spray nozzle causes the drive ring to rotate. The drive ring drives the rod changing pipe to rotate synchronously, thereby realizing the alternating reciprocating sliding between the first energized support rod and the second energized support rod.

[0013] Optionally, the hose is equipped with a flow valve electrically connected to the control system.

[0014] By adopting the above technical solution, workers can adjust the total flow rate recorded by the flow valve during the time interval between the top of the first energized support rod and the top of the second energized support rod. Then, they can indirectly design the total flow rate recorded by the flow valve in a single operation on the control system. This allows the control system to indirectly control the start and stop time of the water pump, thus facilitating the electroplating of the pipe shell.

[0015] Optionally, the power supply component includes a connecting ring disk coaxially disposed on the branch pipe, a spacer post disposed between the connecting ring disk and the support plate, a negative wire electrically connected to the control system passing through the branch pipe, two brush grooves being formed on the circumferential outer wall of the connecting ring disk, a graphite brush electrically connected to the negative wire being slidably disposed in the brush groove, a tension spring supporting the graphite brush and the brush groove, and an insulating layer being sleeved on the top of both the first energized support rod and the second energized support rod, such that when one of the graphite brushes abuts against one of the first energized support rods, the other graphite brush abuts against the insulating layer on one of the second energized support rods.

[0016] By adopting the above technical solution, when the top of the first energized support rod abuts against the tube shell, the graphite brush corresponding to the first energized support rod abuts against the outer wall of the first energized support rod under the action of the tension spring, while the other graphite brush abuts against the insulating layer of the second energized support rod. At this time, the current from the negative electrode wire is transmitted to the tube shell through the graphite brush and the first energized support rod, thereby electroplating the surface of the tube shell.

[0017] Optionally, the insulating rod has a polygonal cross-section, a limiting plate is provided on the insulating rod, and a reset spring is provided between the limiting plate and the connecting ring disc.

[0018] By adopting the above technical solution, during the electroplating process, only the first or second energized support rod can contact the tube shell. At the same time, when the tube shell is at the top of the first energized support rod, the reset spring can prevent the end of the second energized support rod from being electroplated, thereby reducing the occurrence of electroplating on structures other than the tube shell and greatly improving the utilization rate of the electroplating solution.

[0019] Optionally, a first sealing ring is provided between the protective sleeve and the insulating rod, and a second sealing ring is provided between the support plate and the insulating layer.

[0020] By adopting the above technical solution, the occurrence of electroplating solution entering the protective casing is reduced.

[0021] Secondly, this application provides a method for using a nickel plating apparatus for thyristor casings, employing the following technical solution: A method for using a thyristor casing nickel plating device includes the following steps: S1. The worker first places the thyristor casing on the support plate, at which time the casing is supported by multiple first energized support rods. S2. The lifting component drives the electroplating rack to slide vertically, so that the submersible rack moves the support plate into the electroplating solution in the nickel plating tank; S3. The power supply component supplies power to the first energized support rod. After a period of time, the surface of the tube shell on the first energized support rod is electroplated. S4. The top support assembly drives the first energized support rod and the second energized support rod to slide back and forth alternately, so that multiple second energized support rods support the tube shell. Then, the power supply component supplies power to the second energized support rods. After a period of time, the surface of the tube shell is electroplated again. S5. The top support assembly drives the first energized support rod and the second energized support rod to slide back and forth alternately multiple times.

[0022] By adopting the above technical solution, the tube shell is alternately lifted by the first and second energized support rods and electroplated, thereby making the coating on the surface of the tube shell more complete and beautiful, reducing the possibility of "shielding dead corners", and improving the corrosion resistance of the tube shell after electroplating.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. The worker first places the thyristor shell on the support plate. At this time, the shell is supported by multiple first energized support rods. The lifting component drives the electroplating rack to slide vertically downward, so that the submersible rack and the support plate are immersed in the electroplating solution in the nickel plating tank. Then, the power supply component supplies power to the first energized support rods. After a period of time, a layer of metallic nickel is electroplated on the surface of the shell. Subsequently, the supporting component drives the first and second energized support rods to slide back and forth alternately, so that multiple second energized support rods support the shell. Then, the power supply component supplies power to the second energized support rods. After a period of time, a layer of metallic nickel is electroplated on the surface of the shell again. The above process is repeated until the nickel layer on the surface of the shell meets the requirements of the composite product. In this way, the surface of the shell is electroplated evenly, reducing the impact of the "shielding dead corner" on the surface plating of the shell, thereby improving the appearance and corrosion resistance of the shell. 2. The rotating component drives the changing rod tube to rotate. The rotating changing rod tube pushes the round rod corresponding to the second energized support rod to gradually slide out of the driving slot through the inclined driving slot, while the round rod corresponding to the first energized support rod will gradually slide into the driving slot. During this process, the tube shell is smoothly replaced from the top of the first energized support rod to the top of the second energized support rod. The "shielding dead angle" between the tube shell and the top of the first energized support rod will be electroplated and repaired after the second energized support rod is energized, thereby reducing the impact of the "shielding dead angle" on the tube shell. 3. When the top of the first energized support rod abuts against the casing, the graphite brush corresponding to the first energized support rod abuts against the outer wall of the first energized support rod under the action of the tension spring, while the other graphite brush abuts against the insulating layer of the second energized support rod. At this time, the current from the negative electrode wire is transmitted to the casing through the graphite brush and the first energized support rod, thereby electroplating the surface of the casing. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0025] Figure 2 This is a structural schematic diagram in the embodiments of this application used to illustrate the positional relationship between the sleeve, the support plate, and the drive ring.

[0026] Figure 3 This is a cross-sectional view used in the embodiments of this application to illustrate the positional relationship between the protective sleeve, the connecting ring disk, and the graphite brush.

[0027] Figure 4This is a structural schematic diagram in the embodiments of this application used to illustrate the positional relationship between the round rod, the rod changing tube, and the drive ring.

[0028] Explanation of reference numerals in the attached drawings: 1. Tube shell; 2. Nickel plating tank; 3. Electroplating rack; 4. Lifting cylinder; 5. Submersible rack; 6. Shell placement mechanism; 61. Branch pipe; 62. Support plate; 63. First energized support rod; 64. Second energized support rod; 65. Top support assembly; 651. Protective casing; 652. Insulating rod; 653. Round rod; 654. Intermediate plate; 655. Rod changing pipe; 656. Rotating component; 6560. Base pipe; 6561. Drive ring; 6562. Liquid inlet; 6563. Spray nozzle; 6564. Tray; 6 565. Supply pipe; 6566. Connecting pipe; 6567. Water pump; 6568. Inlet pipe; 6569. Hose; 657. Drive slot; 66. Power supply component; 661. Connecting ring disc; 662. Spacer; 663. Negative conductor; 664. Brush slot; 665. Graphite brush; 666. Tensioning spring; 667. Insulation layer; 7. Flow valve; 8. Limiting plate; 9. Reset spring; 10. First sealing ring; 11. Second sealing ring; 12. Support pipe; 13. Sleeve; 14. Third sealing ring. Detailed Implementation

[0029] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0030] Example 1 This application discloses a nickel plating apparatus for thyristor casings.

[0031] Reference Figure 1 A nickel plating apparatus for thyristor casings includes a nickel plating tank 2, in which an anode nickel plate (not shown in the figure) electrically connected to a control system is arranged. An electroplating rack 3 is vertically slidably arranged on the nickel plating tank 2. A lifting component is arranged on the nickel plating tank 2 to drive the electroplating rack 3 to slide vertically. The lifting component includes a lifting cylinder 4 bolted to the side of the nickel plating tank 2 and electrically connected to the control system. The electroplating rack 3 is bolted to the piston rod of the lifting cylinder 4.

[0032] Reference Figure 1 , Figure 2 and Figure 3 Below the electroplating rack 3, a submersible rack 5 is welded. Multiple shell-holding mechanisms 6 for placing the shell 1 are evenly distributed on the submersible rack 5. Each shell-holding mechanism 6 includes a branch pipe 61 welded to the submersible rack 5. A support plate 62 is coaxially arranged on the branch pipe 61. A first energized support rod 63 and a second energized support rod 64 with identical structures are vertically slidably arranged on the support plate 62.

[0033] Reference Figure 3 and Figure 4The first energized support rod 63 and the second energized support rod 64 are both made of metal. Three of the first energized support rod 63 and the second energized support rod 64 are evenly distributed around the support plate 62 along the axis of the branch pipe 61. The first energized support rod 63 and the second energized support rod 64 are arranged alternately around the support plate 62. The tube shell 1 is used to be placed on the top of the first energized support rod 63 or the top of the second energized support rod 64.

[0034] The worker first places the cleaned metal tube shell 1 on top of the first energized support rod 63. Then, the control system starts the lifting cylinder 4. The piston rod of the lifting cylinder 4 retracts, and the piston rod of the lifting cylinder 4 drives the electroplating rack 3 to slide vertically downward. The electroplating rack 3 drives the tube shell 1 on the submerged rack 5 to be immersed in the electroplating solution in the nickel plating tank 2.

[0035] Reference Figure 3 and Figure 4 A top support assembly 65 is arranged on the branch pipe 61. The top support assembly 65 is used to drive the first energized support rod 63 and the second energized support rod 64 to slide vertically back and forth alternately. The top support assembly 65 includes a protective sleeve 651 coaxially welded to the bottom of the support plate 62. The protective sleeve 651 is hollow inside and open at the top.

[0036] Reference Figure 3 The branch pipe 61 vertically passes through the inner and outer walls of the bottom of the protective cylinder 651. The bottom of the first energized support rod 63 and the second energized support rod 64 are both bolted with an insulating rod 652 with a polygonal cross-section. The insulating rod 652 slides vertically through the inner and outer walls of the bottom of the protective cylinder 651. A first sealing ring 10 is arranged between the protective cylinder 651 and the insulating rod 652. The first sealing ring 10 is made of rubber material.

[0037] Reference Figure 3 A round rod 653 is welded to the insulating rod 652 at the bottom of the casing 651. An intermediate disc 654 is coaxially welded to the branch pipe 61 below the casing 651. A support pipe 12 is welded between the intermediate disc 654 and the bottom of the casing 651.

[0038] Reference Figure 3 and Figure 4 A rod changing tube 655 is coaxially rotatably connected to the intermediate disk 654. Multiple drive slots 657 with V-shaped cross sections are evenly opened on the rod changing tube 655 and along its axis. The V-shaped angle of the drive slots 657 is rounded.

[0039] Reference Figure 3 and Figure 4The number of drive slots 657 is half that of round rods 653. The round rods 653 slide in the drive slots 657. When the round rod 653 at the bottom of the first energized support rod 63 abuts against the drive slot 657, the round rod 653 at the bottom of the second energized support rod 64 abuts against the top of the rod changing tube 655. A rotating component 656 for driving the rod changing tube 655 to rotate is arranged on the support tube 61.

[0040] Reference Figure 3 The rotating component 656 includes a base tube 6560 coaxially welded to the bottom of the intermediate disk 654. The base tube 6560 is sleeved outside the branch tube 61. There is a gap between the inner circumferential sidewall of the base tube 6560 and the outer circumferential sidewall of the branch tube 61. A drive ring 6561 is coaxially welded to the bottom of the rod changing tube 655. There is a gap between the inner circumferential sidewall of the drive ring 6561 and the outer circumferential sidewall of the branch tube 61.

[0041] Reference Figure 3 and Figure 4 A liquid inlet 6562 is opened between the inner and outer walls of the base tube 6560 and the inner side of the drive ring 6561. Multiple injection ports 6563 are opened between the inner and outer walls of the drive ring 6561. The multiple injection ports 6563 are evenly distributed circumferentially along the axis of the drive ring 6561. The axis of the injection ports 6563 is inclined to the axis of the branch tube 61. A tray 6564 is coaxially welded on the base tube 6560. The tray 6564 abuts against the bottom of the drive ring 6561.

[0042] Reference Figure 1 and Figure 3 A liquid supply pipe 6565 is bolted to the electroplating rack 3. A connecting pipe 6566 connects the liquid supply pipe 6565 to the inner wall of the base pipe 6560. A water pump 6567, which is electrically connected to the control system, is bolted to the side of the nickel plating tank 2. An inlet pipe 6568 connects the inlet end of the water pump 6567 to the bottom of the nickel plating tank 2. A flexible hose 6569 connects the liquid supply pipe 6565 to the outlet end of the water pump 6567. A flow valve 7, which is electrically connected to the control system, is bolted to the flexible hose 6569.

[0043] Reference Figure 3 The electroplating rack 3 is equipped with a power supply component 66, which is used to supply power to the first energized support rod 63 or the second energized support rod 64. The power supply component 66 includes a connecting ring disk 661 coaxially welded to the branch pipe 61. A spacer post 662 is welded between the connecting ring disk 661 and the support plate 62. A negative wire 663 electrically connected to the control system is passed through the branch pipe 61. The negative wire 663 is used to connect to the negative terminal of the power supply.

[0044] Reference Figure 3Two brush grooves 664 are provided on the outer circumferential wall of the connecting ring disk 661. A graphite brush 665 electrically connected to the negative electrode wire 663 is slidably arranged in the brush groove 664. The graphite brush 665 is made of graphite. A tension spring 666 is supported between the graphite brush 665 and the brush groove 664. The tension spring 666 is made of metal. The top of the first energized support rod 63 and the second energized support rod 64 are both covered with an insulating layer 667.

[0045] Reference Figure 3 When one graphite brush 665 abuts against one of the first energized support rods 63, the other graphite brush 665 abuts against the insulating layer 667 on one of the second energized support rods 64. A second sealing ring 11 is provided between the support plate 62 and the insulating layer 667. The second sealing ring 11 is made of rubber material. A limiting plate 8 is welded on the insulating rod 652. A reset spring 9 is supported between the limiting plate 8 and the connecting ring disc 661. The reset spring 9 is made of metal material.

[0046] Reference Figure 2 and Figure 3 A sleeve 13 is coaxially welded to the bottom of the rod changing tube 655. The sleeve 13 is fitted onto the outside of the protective sleeve 651. A third sealing ring 14 is arranged between the bottom of the sleeve 13 and the top of the drive ring 6561. The third sealing ring 14 is made of rubber material. The undefined materials inside the sleeve 13 are all made of non-metallic materials.

[0047] The control system supplies power to the negative conductor 663. The current flows sequentially along the negative conductor 663, the graphite brush 665 and the first energized support rod 63 to the tube shell 1. After a period of time, a layer of metallic nickel is electroplated onto the surface of the tube shell 1.

[0048] At this time, the control system stops supplying power to the negative conductor 663 and starts the water pump 6567. The water pump 6567 pumps the electroplating solution in the nickel plating tank 2 into the drive ring 6561 in sequence through the inlet pipe 6568, along the hose 6569, supply pipe 6565, connecting pipe 6566, base pipe 6560 and liquid inlet 6562.

[0049] Then, the electroplating liquid is sprayed out at an angle from the spray nozzle 6563 on the drive ring 6561. The reaction force of the electroplating liquid sprayed out from the spray nozzle 6563 causes the drive ring 6561 to rotate a certain number of times. During this process, the flow valve 7 records the flow rate through the hose 6569 at all times until the single flow rate recorded by the flow valve 7 reaches the design requirements. At this time, the control system stops the water pump 6567.

[0050] During the entire recording process of the flow valve 7, the drive ring 6561 will drive the rod changing tube 655 to rotate at a fixed angle. During this process, the inclined surface of the drive slot 657 on the rod changing tube 655 will push the round rod 653 at the bottom of the second energized support rod 64 to slide upward. The reset spring 9 corresponding to the second energized support rod 64 will be continuously compressed, while the round rod 653 corresponding to the first energized support rod 63 will gradually slide into the drive slot 657.

[0051] At the same time, the reset spring 9 corresponding to the first energized support rod 63 gradually recovers its deformation until the rod changing tube 655 stops rotating. At this time, the graphite brush 665 corresponding to the first energized support rod 63 will abut against the insulating layer 667 on the first energized support rod 63.

[0052] The graphite brush 665 corresponding to the second energized support rod 64 will abut against the second energized support rod 64. The tube shell 1 is replaced by the top of the first energized support rod 63 and the top of the second energized support rod 64. The first sealing ring 10 and the second sealing ring 11 ensure the sealing of the internal space of the protective sleeve 651.

[0053] Subsequently, the control system supplies power to the negative wire 663 again. At this time, the second energized support rod 64 will be energized and the tube shell 1 will be electroplated. The above process is repeated multiple times for electroplating. Since the first energized support rod 63 and the second energized support rod 64 support the tube shell 1 at different positions, the surface of the tube shell 1 is completely electroplated with a layer of metallic nickel.

[0054] The implementation principle of Example 1 is as follows: The worker first places the cleaned metal tube shell 1 on the top of the first energized support rod 63. Then, the control system starts the lifting cylinder 4. The piston rod of the lifting cylinder 4 retracts, and the piston rod of the lifting cylinder 4 drives the electroplating rack 3 to slide vertically downward. The electroplating rack 3 drives the tube shell 1 on the submerged rack 5 to be immersed in the electroplating solution in the nickel plating tank 2.

[0055] The control system supplies power to the negative conductor 663. The current flows sequentially along the negative conductor 663, the graphite brush 665 and the first energized support rod 63 to the tube shell 1. After a period of time, a layer of metallic nickel is electroplated onto the surface of the tube shell 1.

[0056] At this time, the control system stops supplying power to the negative conductor 663 and starts the water pump 6567. The water pump 6567 pumps the electroplating solution in the nickel plating tank 2 into the drive ring 6561 in sequence through the inlet pipe 6568, along the hose 6569, supply pipe 6565, connecting pipe 6566, base pipe 6560 and liquid inlet 6562.

[0057] Then, the electroplating liquid is sprayed out at an angle from the spray nozzle 6563 on the drive ring 6561. The reaction force of the electroplating liquid sprayed out from the spray nozzle 6563 causes the drive ring 6561 to rotate a certain number of times. During this process, the flow valve 7 records the flow rate through the hose 6569 at all times until the single flow rate recorded by the flow valve 7 reaches the design requirements. At this time, the control system stops the water pump 6567.

[0058] During the entire recording process of the flow valve 7, the drive ring 6561 will drive the rod changing tube 655 to rotate at a fixed angle. During this process, the inclined surface of the drive slot 657 on the rod changing tube 655 will push the round rod 653 at the bottom of the second energized support rod 64 to slide upward. The reset spring 9 corresponding to the second energized support rod 64 will be continuously compressed, while the round rod 653 corresponding to the first energized support rod 63 will gradually slide into the drive slot 657.

[0059] At the same time, the reset spring 9 corresponding to the first energized support rod 63 gradually recovers its deformation until the rod changing tube 655 stops rotating. At this time, the graphite brush 665 corresponding to the first energized support rod 63 will abut against the insulating layer 667 on the first energized support rod 63.

[0060] The graphite brush 665 corresponding to the second energized support rod 64 will abut against the second energized support rod 64. The tube shell 1 is replaced by the top of the first energized support rod 63 and the top of the second energized support rod 64. The first sealing ring 10 and the second sealing ring 11 ensure the sealing of the internal space of the protective sleeve 651.

[0061] Subsequently, the control system supplies power to the negative wire 663 again. At this time, the second energized support rod 64 will be energized and the tube shell 1 will be electroplated. The above process is repeated multiple times for electroplating. Since the first energized support rod 63 and the second energized support rod 64 support the tube shell 1 at different positions, the surface of the tube shell 1 is completely electroplated with a layer of metallic nickel.

[0062] Example 2 Embodiment 2 of this application discloses a method for using a nickel plating apparatus for thyristor casings, comprising the following steps: S1. Place the cleaned metal tube shell 1 on top of the first energized support rod 63, start the lifting cylinder 4, and the electroplating rack 3 drives the tube shell 1 on the submerged rack 5 to be immersed in the electroplating solution in the nickel plating tank 2. S2. The control system supplies power to the negative conductor 663, and the tube shell 1 located at the top of the first energized support rod 63 is electroplated for a period of time. S3. The control system starts the water pump 6567 and it works for a period of time. The water pump 6567 draws the electroplating solution in the nickel plating tank 2 into the drive ring 6561 through the inlet pipe 6568, along the hose 6569, supply pipe 6565, connecting pipe 6566, base pipe 6560 and liquid inlet 6562 in sequence, and sprays it out at an angle from the spray nozzle 6563. The drive ring 6561 rotates at a certain angle, and the flow valve 7 records the flow rate through the hose 6569 at all times. S4. The drive ring 6561 will drive the rod changing tube 655 to rotate at a fixed angle, the first energized support rod 63 will descend, the second energized support rod 64 will rise, and the tube shell 1 at the top of the first energized support rod 63 will be replaced at the top of the second energized support rod 64. S5. The control system supplies power to the negative conductor 663 again, and the tube shell 1 located at the top of the second energized support rod 64 is electroplated again for a period of time. S6. The control system restarts the water pump 6567 for a period of time, so that the pipe shell 1 located at the top of the second energized support rod 64 is replaced at the top of the first energized support rod 63. S7. The control system supplies power to the negative conductor 663 again, and the tube shell 1 located at the top of the first energized support rod 63 is electroplated again for a period of time. The above process is repeated multiple times until the requirements for electroplating on the surface of the tube shell 1 are met.

[0063] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for nickel plating thyristor casings, characterized in that: The system includes a nickel plating tank (2), on which an electroplating rack (3) is vertically slidably mounted. A lifting device is provided on the nickel plating tank (2) to drive the electroplating rack (3) to slide vertically. A submersible rack (5) is provided on the electroplating rack (3). Multiple shell-holding mechanisms (6) for placing the shell (1) are evenly distributed on the submersible rack (5). Each shell-holding mechanism (6) includes a branch pipe (61) mounted on the submersible rack (5). A support plate (62) is coaxially mounted on the branch pipe (61). A first energized support rod (63) and a second energized support rod (64) of identical structure are vertically slidably mounted on the support plate (62). The first energized support rod (63) and the second energized support rod (64) are... Multiple support rods (64) are evenly distributed around the axis of the branch pipe (61). The first energized support rod (63) and the second energized support rod (64) are arranged alternately. The pipe shell (1) is used to be placed on the top of the first energized support rod (63) or the top of the second energized support rod (64). A top support assembly (65) is provided on the branch pipe (61). The top support assembly (65) is used to drive the first energized support rod (63) and the second energized support rod (64) to slide back and forth alternately. A power supply component (66) is provided on the electroplating rack (3). The power supply component (66) is used to supply power to the first energized support rod (63) or the second energized support rod (64).

2. The thyristor casing nickel plating apparatus according to claim 1, characterized in that: The lifting component includes a lifting cylinder (4) disposed next to the nickel plating tank (2) and electrically connected to the control system, and the electroplating rack (3) is disposed on the piston rod of the lifting cylinder (4).

3. The thyristor casing nickel plating apparatus according to claim 2, characterized in that: The top support assembly (65) includes a protective sleeve (651) coaxially disposed at the bottom of the support plate (62). The protective sleeve (651) is hollow inside and open at the top. The branch pipe (61) passes through the bottom of the protective sleeve (651). The bottom of the first energized support rod (63) and the second energized support rod (64) are both provided with insulating rods (652). The insulating rods (652) slide vertically through the bottom of the protective sleeve (651). A round rod (653) is provided on the insulating rods (652) at the bottom of the protective sleeve (651). An intermediate plate (654) is coaxially disposed on the branch pipe (61) and below the protective sleeve (651). A rod-changing tube (655) is coaxially rotatably mounted on the branch pipe (61). A rotating component (656) is mounted on the branch pipe (61) to drive the rod-changing tube (655) to rotate. Multiple drive slots (657) with V-shaped cross-sections are evenly opened on the rod-changing tube (655) and along its axis. The number of drive slots (657) is half the number of round rods (653). The round rods (653) slide in cooperation with the drive slots (657). When the round rod (653) at the bottom of the first energized support rod (63) abuts against the drive slot (657), the round rod (653) at the bottom of the second energized support rod (64) abuts against the top of the rod-changing tube (655).

4. The thyristor casing nickel plating apparatus according to claim 3, characterized in that: The rotating component (656) includes a base tube (6560) coaxially disposed at the bottom of the intermediate disk (654). The base tube (6560) is sleeved on the branch pipe (61). There is a gap between the inner circumferential sidewall of the base tube (6560) and the outer circumferential sidewall of the branch pipe (61). A driving ring (6561) is coaxially disposed at the bottom of the rod changing pipe (655). There is a gap between the inner circumferential sidewall of the driving ring (6561) and the outer circumferential sidewall of the branch pipe (61). A liquid inlet (6562) is opened between the inner and outer sides of the base tube (6560) and the inner side of the driving ring (6561). A plurality of injection ports (6563) are opened between the inner and outer sides of the driving ring (6561). The plurality of injection ports (6563) are arranged along the driving ring (655). The axis of the 561) is evenly distributed around the circumference. The axis of the spray nozzle (6563) is inclined to the axis of the branch pipe (61). A tray (6564) is coaxially arranged on the base pipe (6560). The tray (6564) abuts against the bottom of the drive ring (6561). A liquid supply pipe (6565) is arranged on the electroplating rack (3). A connecting pipe (6566) is connected between the liquid supply pipe (6565) and the inner wall of the base pipe (6560). A water pump (6567) electrically connected to the control system is arranged next to the nickel plating tank (2). The liquid inlet end of the water pump (6567) is connected to the bottom of the nickel plating tank (2) by a liquid inlet pipe (6568). A hose (6569) is connected between the liquid supply pipe (6565) and the liquid outlet end of the water pump (6567).

5. The thyristor casing nickel plating apparatus according to claim 4, characterized in that: The hose (6569) is equipped with a flow valve (7) that is electrically connected to the control system.

6. The thyristor casing nickel plating apparatus according to claim 4, characterized in that: The power supply component (66) includes a connecting ring disk (661) coaxially mounted on the branch pipe (61). A spacer post (662) is provided between the connecting ring disk (661) and the support plate (62). A negative electrode wire (663) electrically connected to the control system is passed through the branch pipe (61). Two brush grooves (664) are opened on the circumferential outer wall of the connecting ring disk (661). Graphite that is electrically connected to the negative electrode wire (663) is slidably disposed in the brush grooves (664). The graphite brush (665) is supported by a tension spring (666) between the brush groove (664). The top of the first energized support rod (63) and the second energized support rod (64) are both covered with an insulating layer (667). When one of the graphite brushes (665) abuts against one of the first energized support rods (63), the other graphite brush (665) abuts against the insulating layer (667) on one of the second energized support rods (64).

7. The thyristor casing nickel plating apparatus according to claim 6, characterized in that: The insulating rod (652) has a polygonal cross-section and a limiting plate (8) is provided on the insulating rod (652). A reset spring (9) is provided between the limiting plate (8) and the connecting ring disc (661).

8. The thyristor casing nickel plating apparatus according to claim 6, characterized in that: A first sealing ring (10) is provided between the protective sleeve (651) and the insulating rod (652), and a second sealing ring (11) is provided between the support plate (62) and the insulating layer (667).

9. A method of using the thyristor casing nickel plating apparatus according to any one of claims 1-8, characterized in that: Includes the following steps: S1. The worker first places the thyristor casing (1) on the support plate (62), at which time the casing (1) is supported by multiple first energized support rods (63); S2. The lifting component drives the electroplating rack (3) to slide vertically, so that the submersible rack (5) drives the support plate (62) to be immersed in the electroplating solution in the nickel plating tank (2); S3. The power supply component (66) supplies power to the first energized support rod (63). After a period of time, the surface of the tube shell (1) on the first energized support rod (63) is electroplated. S4. The top support assembly (65) drives the first energized support rod (63) and the second energized support rod (64) to slide back and forth alternately, so that multiple second energized support rods (64) support the tube shell (1). Then, the power supply component (66) supplies power to the second energized support rods (64). After a period of time, the surface of the tube shell (1) is electroplated again. S5. The top support assembly (65) drives the first energized support rod (63) and the second energized support rod (64) to slide back and forth alternately multiple times.

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