Device for preparing plating layer with uniform thickness through electroplating and operation method thereof

Abstract

The invention discloses a device for preparing a plating layer with uniform thickness through electroplating, which comprises an electroplating bath, an anode and an adjusting device for controlling the exposed area of the anode in the electroplating bath, the anode is arranged in the electroplating bath, the adjusting device comprises a multi-section shielding sleeve, a rope and a driving wheel, the multi-section shielding sleeve is arranged in the electroplating bath, and the rope is arranged on the multi-section shielding sleeve. The multi-section shielding sleeve is arranged in the electroplating bath and is sleeved outside the anode from the bottom of the anode, the driving wheel is arranged above the multi-section shielding sleeve and is connected with the top of the multi-section shielding sleeve through a rope, and the length of the multi-section shielding sleeve is adjusted through the driving wheel, so that the exposed area of the anode in the electroplating bath is adjusted; the anode area is consistent with the electroplating workpiece area through the adjusting device, power line concentration at the two ends of the electrode is reduced, and the electroplating layer is uniform in thickness.

Description

Technical Field

[0001] The present invention relates to the field of electroplating, and in particular to a device for preparing a coating with uniform thickness by electroplating and an operating method thereof. Background Art

[0002] Electroplating technology is an additive manufacturing technology that belongs to the field of surface treatment technology. It has the advantages of fast forming speed, good coating adhesion, and high hardness. Therefore, it is widely used in aerospace, automobile manufacturing, medical, electronics, and engineering machinery. At present, electroplated chromium layers are widely used on the surface of piston rods in engineering machinery. Piston rods serve as connecting parts of pistons and connecting parts with frequent movements and high technical requirements. The quality of piston rod processing directly affects the service life and reliability of the entire hydraulic cylinder. Since the piston rod is in contact with the seal of the guide sleeve, the size of the piston rod, the uniformity of the coating thickness, and the surface roughness have a great influence on the life of the seal. Therefore, it is necessary to prepare a piston rod with uniform coating thickness.

[0003] In order to improve the thickness uniformity of the hydraulic cylinder piston rod, patent application number 201110375741.4 proposed a piston rod surface electroplating process. By using a small amount of repeated plating, and grinding after each chrome plating, and polishing after reaching the required size, it has the advantages of uniform electroplating layer thickness and greatly improved corrosion resistance. However, it requires repeated electroplating, grinding and polishing, resulting in low production efficiency and insufficient corrosion resistance in the leakage area of ​​the piston rod.

[0004] Existing similar patents typically utilize multiple types of cathode shielding or excess power line absorbing fixtures to achieve shielding operations for different piston rod types and achieve relatively consistent plating thickness. However, this approach struggles to accommodate variations in piston rod length and diameter, requiring the production of multiple fixtures. This is both costly and inefficient, and it is difficult to meet the requirements for uniform plating thickness across a wide range of piston rod types and specifications. Summary of the Invention

[0005] In view of the problems existing in the above-mentioned prior art, in order to achieve uniformity in the thickness of the electroplated coating of piston rods of different lengths and avoid thick coating at both ends of the piston rod, in order to ensure that the coating thickness and size of each part of the piston rod meet the design requirements and achieve uniformity in the overall electroplated coating thickness of the piston rod, according to the characteristics of the concentration of electric lines at both ends of the electrode in the electroplating electric field, the present invention provides an electroplating device for preparing uniform thickness coating to achieve anode area adjustment, ensure that the area of ​​the electroplating anode is consistent with that of the piston rod, and avoid large ends at both ends of the piston rod; the electroplating device for preparing uniform thickness coating comprises: an electroplating tank, an anode, and an adjustment device for controlling the exposed area of ​​the anode in the electroplating tank, the anode is arranged in the electroplating tank, and by arranging the adjustment device for controlling the exposed area of ​​the anode in the electroplating tank in the electroplating tank, the thickness uniformity of the electroplated coating is high, and the height of the multi-section shielding sleeve is adjusted by a rope using the driving wheel in the adjustment device. The height of the upper end surface of the multi-section shielding sleeve is kept level with the lower bottom of the electroplated workpiece, ensuring that the anode area is consistent with the electroplated workpiece area, reducing the concentration of electric lines at both ends of the electrode, and having the advantage of uniform electroplating coating thickness.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a device for preparing a coating of uniform thickness by electroplating, comprising: an electroplating tank, an anode, and an adjusting device for controlling the exposed area of ​​the anode in the electroplating tank, the anode being arranged in the electroplating tank, the adjusting device comprising: a multi-section shielding sleeve, a rope, and a driving wheel, the multi-section shielding sleeve being arranged in the electroplating tank and being sleeved on the outside of the anode from the bottom of the anode, the driving wheel being arranged above the multi-section shielding sleeve and being connected to the top of the multi-section shielding sleeve by a rope, the length of the multi-section shielding sleeve being adjusted by the driving wheel, and then the exposed area of ​​the anode in the electroplating tank being adjusted.

[0007] Furthermore, a plating workpiece is provided in the plating tank, and the plating workpiece serves as a cathode.

[0008] Furthermore, the electroplating workpiece and the anode are connected to the negative electrode and the positive electrode in the electroplating system respectively.

[0009] Furthermore, the electroplating workpiece is fixed at a distance of 6 to 8 cm from the anode; the walls of the electroplating tank at both ends are 5 to 10 cm away from the anode and the electroplating workpiece, and the bottom of the electroplating tank is located 20 to 30 cm away from the bottom of the anode.

[0010] Furthermore, the electroplated workpiece is a piston rod.

[0011] Furthermore, a liquid outlet is provided at the bottom of the electroplating tank, and a liquid inlet is provided at the upper end.

[0012] Furthermore, the electroplating device for preparing a uniform thickness coating is also provided with a circulation pump, the inlet and outlet of the circulation pump are respectively connected to the liquid outlet and liquid inlet of the electroplating tank through pipelines.

[0013] Furthermore, the bottom of the multi-section shielding sleeve is connected to the bottom of the electroplating tank, and the upper end is connected to the driving wheel through a rope.

[0014] Furthermore, the multi-section shielding sleeve includes: sleeve I, sleeve II, sleeve III, sleeve II is slidably mounted on sleeve III, sleeve I is slidably mounted on sleeve II, so that sleeve I, sleeve II and sleeve III are maintained on the same busbar, wherein the bottom of sleeve III is connected to the electroplating tank.

[0015] An operating method for an electroplating device for preparing a uniform thickness coating, the specific operating method is as follows: S1: Turn on the circulation pump and electroplating heating system, wait until the plating bath temperature rises to 55-60℃, and maintain this temperature; S2: After fixing the electroplating workpiece, control the driving wheel to drive the rope according to the length of the electroplating workpiece, and adjust the height of the multi-section shielding sleeve so that the height of the upper end surface of the sleeve I is level with the bottom of the electroplating workpiece, ensuring that the anode area is consistent with the area of ​​the electroplating workpiece; S3: After the workpiece to be electroplated is activated in the electroplating tank for 2-3 minutes, the power is turned on and electroplating is carried out for 110-120 minutes; S4: After the electroplating is completed, turn off the electroplating power supply, turn off the circulation pump, and finally clean the surface of the electroplated workpiece to ensure its surface cleanliness.

[0016] During electroplating, the workpiece to be plated is placed parallel to the anode.

[0017] The beneficial effects of the present invention are: (1) By using the driving wheel in the adjustment device to adjust the height of the multi-section shielding sleeve through a rope, the height of the upper end surface of the multi-section shielding sleeve is kept level with the bottom of the electroplating workpiece, ensuring that the anode area is consistent with the electroplating workpiece area, reducing the concentration of electric lines at both ends of the electrode, and having the advantage of uniform electroplating coating thickness; The multi-section shielding sleeve has a simple and compact structure, is reliable in use, and has low manufacturing cost; The present invention has a simple structure, is easy to use, has strong applicability, and is suitable for the electroplating needs of various types of piston rods. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention; In the figure: 1. Driving wheel; 2. Anode; 3. Rope; 4. Sleeve I; 5. Sleeve II; 6. Sleeve III; 7. Piston rod; 8. Electroplating tank; 9. Circulating pump. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention pertains. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0021] like Figure 1 As shown, an electroplating device for preparing a uniform thickness coating includes: an electroplating tank 8, an anode 2, an adjusting device for controlling the exposed area of ​​the anode 2 in the electroplating tank 8, a piston rod 7, and a circulation pump 9. The anode 2 is arranged in the electroplating tank 8, and the electroplating tank 8 is provided with a liquid outlet at the bottom and a liquid inlet at the top. The inlet and outlet of the circulation pump 9 are respectively connected to the liquid outlet and liquid inlet of the electroplating tank 8 through pipes. The circulation pump 9 draws liquid from the bottom of the electroplating tank 8 and returns it to the top to ensure uniform circulation of the liquid in the electroplating tank 8; the adjusting device includes: a multi-section shielding sleeve, a rope 3, and a driving wheel 1. The multi-section shielding sleeve is arranged in the electroplating tank 8 and is sleeved on the outside of the anode 2 from the bottom. The driving wheel 1 is arranged above the multi-section shielding sleeve and is connected to the top of the multi-section shielding sleeve through the rope 3. The length of the multi-section shielding sleeve is adjusted by the driving wheel 1 to thereby adjust the exposed area of ​​the anode 2 in the electroplating tank 8. The piston rod 7 and the anode 2 are respectively connected to the negative electrode and the positive electrode in the electroplating system.

[0022] Rope 3 is made of nylon rope.

[0023] The piston rod 7 is fixed at a distance of 26 to 8 cm from the anode; the walls of the electroplating tank 8 at both ends are 75 to 10 cm away from the anode 2 and the piston rod, and the bottom of the electroplating tank 8 is located 20 to 30 cm away from the bottom of the anode 2.

[0024] The bottom of the multi-section shielding sleeve is connected to the bottom of the electroplating tank 8, and the upper end is connected to the driving wheel 1 through the rope 3.

[0025] The multi-section shielding sleeve includes: sleeve I4, sleeve II5, sleeve III6, sleeve II5 is slidably mounted on sleeve III6, sleeve I4 is slidably mounted on sleeve II5, so that sleeve I4, sleeve II5 and sleeve III6 are kept on the same busbar, wherein the bottom of sleeve III6 is connected to the electroplating tank 8.

[0026] A limiting structure is arranged between the sleeve I4, the sleeve II5 and the sleeve III6, that is, the upper end surfaces of the sleeve I4, the sleeve II5 and the sleeve III6 are provided with an outward-folded annular folded edge, the diameter of the sliding hole for installing the sleeve II5 on the sleeve I4 is smaller than the annular folded edge of the sleeve II5, and the diameter of the sliding hole for installing the sleeve III6 on the sleeve II5 is smaller than the annular folded edge of the sleeve III6. The annular folded edge plays a role of limiting and sealing to prevent the electroplating liquid of the shielded anode 2 part from flowing out of the gap and affecting the electroplating layer.

[0027] An operating method for an electroplating device for preparing a uniform thickness coating, the specific operating method is as follows: S1: Turn on the circulation pump 9 and the electroplating heating system, wait until the liquid temperature of the electroplating tank 8 rises to 55-60°C, and maintain this temperature; S2: After fixing the piston rod 7, control the driving wheel 1 to drive the rope 3 according to the length of the piston rod 7, and adjust the height of the multi-section shielding sleeve so that the upper end surface of the sleeve I 4 is level with the lower bottom of the piston rod 7, ensuring that the area of ​​the anode 2 is consistent with the area of ​​the piston rod 7; S3: After the piston rod 7 is activated in the electroplating tank 8 for 2-3 minutes, the power is turned on and electroplating is performed for 110-120 minutes; S4: After the electroplating is completed, the electroplating power supply is turned off, the circulation pump 9 is turned off, and finally the surface of the processed piston rod 7 is cleaned to ensure its surface cleanliness.

[0028] During electroplating, the piston rod 7 is arranged parallel to the anode 2 .

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for preparing a uniform thickness coating by electroplating, characterized in that: include: An electroplating tank, an anode, and an adjusting device for controlling the exposed area of ​​the anode in the electroplating tank. The anode is arranged in the electroplating tank. The adjusting device includes: a multi-section shielding sleeve, a rope, and a driving wheel. The multi-section shielding sleeve is arranged in the electroplating tank and is sleeved onto the outside of the anode from the bottom of the anode. The driving wheel is arranged above the multi-section shielding sleeve and is connected to the top of the multi-section shielding sleeve through a rope. The length of the multi-section shielding sleeve is adjusted by the driving wheel, thereby adjusting the exposed area of ​​the anode in the electroplating tank.

2. The device for preparing a uniform thickness coating by electroplating according to claim 1, characterized in that: The electroplating tank is also provided with an electroplating workpiece, which serves as a cathode.

3. The device for preparing a uniform thickness coating by electroplating according to claim 1, characterized in that: The electroplating workpiece and the anode are connected to the negative electrode and the positive electrode in the electroplating system respectively.

4. The device for preparing a uniform thickness coating by electroplating according to claim 2, characterized in that: The electroplating workpiece is fixed at a distance of 6 to 8 cm from the anode; the walls of the electroplating tank at both ends are 5 to 10 cm away from the anode and the electroplating workpiece, and the bottom of the electroplating tank is located 20 to 30 cm away from the bottom of the anode.

5. The device for preparing a uniform thickness coating by electroplating according to claim 2 or 3, characterized in that: The electroplating workpiece is a piston rod.

6. The device for preparing a uniform thickness coating by electroplating according to claim 2, characterized in that: A liquid outlet is provided at the bottom of the electroplating tank, and a liquid inlet is provided at the top.

7. The device for preparing a uniform thickness coating by electroplating according to claim 6, characterized in that: A circulation pump is also provided, and the inlet and outlet of the circulation pump are respectively connected to the liquid outlet and liquid inlet of the electroplating tank through pipelines.

8. The device for preparing a uniform thickness coating by electroplating according to claim 7, characterized in that: The bottom of the multi-section shielding sleeve is connected to the bottom of the electroplating tank, and the upper end is connected to the driving wheel through a rope.

9. The device for preparing a uniform thickness coating by electroplating according to claim 8, characterized in that: The multi-section shielding sleeve includes: sleeve I, sleeve II, sleeve III, sleeve II is slidably mounted on sleeve III, and sleeve I is slidably mounted on sleeve II, so that sleeve I, sleeve II and sleeve III are kept on the same busbar, wherein the bottom of sleeve III is connected to the electroplating tank.

10. The method for operating an apparatus for preparing a uniform thickness coating by electroplating according to claim 9, characterized in that: The specific operation method is as follows: S1: Turn on the circulation pump and electroplating heating system, wait until the plating bath temperature rises to 55-60℃, and maintain this temperature; S2: After fixing the electroplating workpiece, control the driving wheel to drive the rope according to the length of the electroplating workpiece, and adjust the height of the multi-section shielding sleeve so that the height of the upper end surface of the sleeve I is level with the bottom of the electroplating workpiece, ensuring that the anode area is consistent with the area of ​​the electroplating workpiece; S3: After the workpiece to be electroplated is activated in the electroplating tank for 2-3 minutes, the power is turned on and electroplating is carried out for 110-120 minutes; S4: After the electroplating is completed, turn off the electroplating power supply, turn off the circulation pump, and finally clean the surface of the electroplated workpiece to ensure its surface cleanliness.

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