A device for controlling chrome plating on the inner wall of a deep small hole and automatic clamping of electrodes

Abstract

The invention discloses a controllable power supply and automatic electrode clamping device for chrome plating on the inner wall of a deep small hole, comprising an anode rod upper end clamping device and an anode rod lower end clamping device, wherein the anode rod lower end clamping device is arranged at the bottom and cooperates with the anode rod upper end clamping device to clamp the anode rod; a slender tube is sleeved outside the anode rod and arranged between the anode rod upper end clamping device and the anode rod lower end clamping device, and is the cathode part of the electroplating; the cathode clamping device is used to clamp or loosen the slender tube; a DC current source i s1 and the DC current source i s2 The positive electrode is connected to the clamping device at the upper end of the anode rod and the clamping device at the lower end of the anode rod to transfer the current to the anode rod, and the negative electrode is connected to the cathode clamping device to transfer the current to the slender tube; the DC current source i s1 and the DC current source i s2 Power is supplied from both ends of the anode rod respectively, and the current at both ends is adjustable to achieve controllable power supply.

Description

Technical Field

[0001] The invention relates to the technical field of electroplating, and in particular to a controllable power supply and automatic electrode clamping device for chrome plating on the inner wall of a deep small hole. Background Art

[0002] A long and thin deep hole is in extremely harsh working conditions and needs to have extremely high wear resistance and ablation resistance. Ordinary metal materials are difficult to meet the requirements of this working condition. Usually, a layer of metal chromium needs to be electroplated on the inner wall surface of the deep hole.

[0003] On the one hand, since the aspect ratio of the slender tube exceeds 70, during the electroplating process, due to the attenuation of the anode current, the current density in different parts of the inner wall of the deep hole is inconsistent, resulting in different metal chromium deposition rates in different parts of the inner wall, making the thickness of the chromium layer in different parts inconsistent, which seriously affects the product quality.

[0004] On the other hand, in the traditional electroplating process of a certain slender tube, manual clamping and handling are all adopted, which has high labor intensity, poor working environment, and is not conducive to occupational health. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of existing chrome plating power supply devices and provide a controllable power supply and automatic electrode clamping device for chrome plating on the inner wall of a deep small hole. Through research and experimental verification, the use of a controllable power supply device can solve the problem of uneven distribution of plating thickness on slender tubes.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A controllable power supply and automatic electrode clamping device for chrome plating on the inner wall of a deep small hole, comprising an anode rod upper end clamping device, which is installed on an electroplating equipment machine tool; an anode rod lower end clamping device, which is installed on the electroplating equipment machine tool and is arranged below the anode rod upper end clamping device, and cooperates with the anode rod upper end clamping device to clamp the anode rod; a slender tube, which is sleeved on the outside of the anode rod and placed between the anode rod upper end clamping device and the anode rod lower end clamping device, and the inner hole surface of the tube is electroplated with chrome, and is the cathode part of the electroplating; a cathode clamping device, which is arranged on the outside of the slender tube, one end of which is installed on the electroplating equipment machine tool, and the other end is used to clamp or loosen the slender tube; a DC current source i s1 The positive electrode is connected to the clamping device at the upper end of the anode rod, and the current is transmitted from the clamping device at the upper end of the anode rod to the anode rod. The negative electrode is connected to the cathode clamping device, and is clamped and contacted with the slender tube through the cathode clamping device; the DC current source i s2 The positive electrode is connected to the clamping device at the lower end of the anode rod, and the current is transmitted from the clamping device at the lower end of the anode rod to the anode rod. The negative electrode is connected to the cathode clamping device, and is clamped and contacted with the slender tube through the cathode clamping device; the DC current source i s1 and the DC current source is2 Power is supplied from both ends of the anode rod respectively, and the current at both ends is adjustable to achieve controllable power supply.

[0008] Preferably, the anode rod upper end clamping device and the anode rod lower end clamping device both include a first cylinder, a first piston, a shell, a clamping sleeve, an elastic sleeve and a sealing cover. The first cylinder is fixedly mounted on the electroplating equipment machine tool. One end of the first piston is connected to the first cylinder and is driven by the first cylinder to reciprocate up and down. The other end of the first piston extends into the shell and is connected to the clamping sleeve. A cavity is provided in the shell, and the clamping sleeve is arranged in the cavity. The elastic sleeve is arranged in the clamping sleeve. Under the push-pull action of the first cylinder on the first piston, the clamping sleeve and the elastic sleeve drive the clamping sleeve to reciprocate up and down. The clamping sleeve and the elastic sleeve are squeezed inward or opened outward by the matching wedge-shaped conical surfaces, thereby clamping or loosening the anode rod.

[0009] Preferably, the DC current source i s1 The positive electrode is connected to the elastic sleeve in the clamping device at the upper end of the anode rod, and the current is transferred from the elastic sleeve to the anode rod. The DC current source i s2 The positive electrode is connected to the elastic sleeve in the clamping device at the lower end of the anode rod, and the current is transferred from the elastic sleeve to the anode rod.

[0010] Preferably, the anode rod is a cylindrical metal rod, which is a slender tube with deep small holes and chrome-plated anode part. The two ends of the anode rod respectively pass through the sealing covers of the anode rod upper end clamping device and the anode rod lower end clamping device, and extend into the elastic jacket.

[0011] Preferably, the cathode clamping device comprises two symmetrically arranged cathode clamping blocks, each cathode clamping block is provided with a rotating shaft and a connecting rod, the middle parts of the two cathode clamping blocks enclose a space for clamping the slender tube, the connecting rod is arranged at the rear of the cathode clamping block, one end is hinged to the cathode clamping block, and the other end is hinged to the second piston, the right side of the second piston is connected to the second cylinder, and the second cylinder is fixedly installed on the electroplating equipment machine tool, the cathode clamping device drives the second piston to push and pull the connecting rod linearly through the second cylinder, so that the cathode clamping block rotates around the rotating shaft to achieve clamping and loosening of the slender tube, and when the cathode clamping device is working, it clamps the middle position of the slender tube in the length direction to make the current distribution uniform.

[0012] Preferably, the DC current source i s1 The negative electrode, DC current source i s2 The negative electrodes are all connected to the cathode clamping blocks of the cathode clamping device.

[0013] Beneficial effects of the present invention:

[0014] 1. The present invention adopts two current sources to supply electricity from both ends of the anode respectively, and the current size at both ends is adjustable and controllable, so that the current density at both ends of the anode is controllable, the current distribution is uniform, and the thickness of the chrome plating layer on the inner wall of the slender tube is more uniform;

[0015] 2. Both ends of the anode and the cathode are pneumatically clamped, which provides the basic conditions for realizing automatic clamping and reduces the labor intensity of operators;

[0016] 3. Due to the use of two-end controllable power supply method, the effective current density on the workpiece surface is more uniform, which greatly improves the product processing qualification rate, reduces the proportion of electrolytic chromium stripping or acid chromium stripping, greatly reduces the consumption of electricity and plating solution, and reduces the emission of heavy metals such as chromium anhydride, with significant energy-saving and emission reduction effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a schematic structural diagram of the anode rod upper end clamping device and the anode rod lower end clamping device of the present invention;

[0019] Figure 3 It is a schematic structural diagram of the cathode clamping device of the present invention.

[0020] Reference numerals

[0021] 1. Clamping device at the upper end of anode rod; 2. Anode rod; 3. Slender tube; 4. Cathode clamping device; 5. Clamping device at the lower end of anode rod; 6. DC current source i s1 , 7. DC current source i s2 ;

[0022] 11. first cylinder, 12. first piston, 13. housing, 14. clamping sleeve, 15. elastic sleeve, 16. sealing cover, 17. wedge-shaped conical surface;

[0023] 41. cathode clamping block; 42. rotating shaft; 43. connecting rod; 44. second piston; 45. second cylinder. DETAILED DESCRIPTION

[0024] The working principle and structure of the present invention are further described in detail below in conjunction with the embodiments and drawings.

[0025] like Figures 1 to 3 As shown, a controllable power supply and automatic electrode clamping device for chrome plating of the inner wall of a deep small hole comprises an anode rod upper end clamping device 1 and an anode rod lower end clamping device 5 installed on a machine tool of an electroplating equipment. The anode rod lower end clamping device 5 is arranged below the anode rod upper end clamping device 1 and cooperates with the anode rod upper end clamping device 1 to clamp the anode rod 2;

[0026] like Figure 2 As shown, the anode rod upper end clamping device 1 and the anode rod lower end clamping device 5 have the same structure and function, and both include a first cylinder 11, a first piston 12, a shell 13, a clamping sleeve 14, an elastic clamping sleeve 15 and a sealing cover 16. The first cylinder 11 is fixedly mounted on the electroplating equipment machine tool. One end of the first piston 12 is connected to the first cylinder 11 and is driven by the first cylinder 11 to reciprocate up and down. The other end extends into the shell 13 and is connected to the clamping sleeve 14. A cavity is provided in the shell 13. The clamping sleeve 14 is arranged at In the cavity, the elastic jacket 15 is arranged in the clamping sleeve 14. Under the push and pull action of the first cylinder 11 on the first piston 12, the clamping sleeve 14 and the elastic jacket 15 drive the clamping sleeve 14 to reciprocate up and down. The clamping sleeve 14 and the elastic jacket 15 are squeezed mutually by the matching wedge-shaped conical surfaces 17 to make the elastic jacket 15 shrink inward or open outward, thereby clamping or loosening the anode rod 2. The sealing cover 16 is fixedly installed at the bottom of the shell 13. A through hole is provided in the middle of the sealing cover 16 for inserting the anode rod 2.

[0027] The slender tube 3 is also included. The slender tube 3 is sleeved outside the anode rod 2 and placed between the anode rod upper end clamping device 1 and the anode rod lower end clamping device 5. The slender tube 3 is a deep small hole tube part, which is the object of electroplating processing. The inner hole surface needs to be electroplated with chrome, and it is the cathode part of the electroplating.

[0028] It also includes a cathode clamping device 4, which is arranged outside the slender tube 3, one end of which is installed on the electroplating equipment machine tool, and the other end is used to clamp or loosen the slender tube 3; Figure 3 As shown, the cathode clamping device 4 includes two symmetrically arranged cathode clamping blocks 41, each cathode clamping block 41 is provided with a rotating shaft 42 and a connecting rod 43, the middle parts of the two cathode clamping blocks 41 enclose a space for clamping the slender tube 3, the connecting rod 43 is arranged at the rear part of the cathode clamping block 41, one end is hinged to the cathode clamping block 41, and the other end is hinged to the second piston 44, the right side of the second piston 44 is connected to the second cylinder 45, and the second cylinder 45 is fixedly installed on the electroplating equipment machine tool. The cathode clamping device 4 drives the second piston 44 to push and pull the connecting rod 43 in a straight line through the second cylinder 45, so that the cathode clamping block 41 rotates around the rotating shaft 42 to achieve clamping and loosening of the slender tube 3. When the cathode clamping device 4 is working, it should clamp the middle position of the length direction of the slender tube 3 to make the current distribution uniform.

[0029] It also includes a DC current source i s1 6. The DC current source i s1 The positive electrode of 6 is connected to the elastic jacket 15 of the clamping device 1 at the upper end of the anode rod, and the current is transmitted from the elastic jacket 15 of the clamping device 1 at the upper end of the anode rod to the anode rod 2, and the negative electrode is connected to the cathode clamping block 41 of the cathode clamping device 4, and is clamped and contacted with the elongated tube 3 through the cathode clamping block 41 of the cathode clamping device 4;

[0030] It also includes a DC current source i s2 7. The DC current source i s2 The positive electrode of 7 is connected to the elastic jacket 15 of the clamping device 5 at the lower end of the anode rod, and the current is transmitted from the elastic jacket 15 of the clamping device at the lower end of the anode rod to the anode rod 2, and the negative electrode is connected to the cathode clamping device 4, and is clamped and contacted with the elongated tube 3 through the cathode clamping block 41 of the cathode clamping device;

[0031] The anode rod 2 in the present invention is a cylindrical metal rod, which is made of a steel wire surface plated with copper (or silver) and then lead-plated. It is a slender tube with a deep small hole and chrome-plated anode part. The two ends of the anode rod 2 respectively pass through the sealing covers 16 of the anode rod upper end clamping device 1 and the anode rod lower end clamping device 5, and extend into the elastic sleeve 15.

[0032] During electroplating, two current sources i are used s1 、i s2 Power is supplied from both ends of the anode, and the current at both ends of the anode rod can be adjusted according to the thickness of the coating on the inner hole of the slender tube.

[0033] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A device for controlling chrome plating on the inner wall of a deep small hole and automatic clamping of an electrode, characterized in that: include The anode rod upper end clamping device is installed on the electroplating equipment machine tool; The anode rod lower end clamping device is installed on the electroplating equipment machine tool, arranged below the anode rod upper end clamping device, and cooperates with the anode rod upper end clamping device to clamp the anode rod; The elongated tube is sleeved outside the anode rod and placed between the clamping device at the upper end of the anode rod and the clamping device at the lower end of the anode rod, and the inner hole surface thereof is electroplated with chrome, which is the cathode part of the electroplating; The cathode clamping device is arranged outside the slender tube, one end of which is mounted on the electroplating equipment machine tool, and the other end is used to clamp or loosen the slender tube; DC current source i s1 The positive electrode is connected to the clamping device at the upper end of the anode rod, and the current is transmitted from the clamping device at the upper end of the anode rod to the anode rod. The negative electrode is connected to the cathode clamping device, and is clamped and contacted with the slender tube through the cathode clamping device. DC current source i s2 The positive electrode is connected to the clamping device at the lower end of the anode rod, and the current is transmitted from the clamping device at the lower end of the anode rod to the anode rod. The negative electrode is connected to the cathode clamping device, and is clamped and contacted with the slender tube through the cathode clamping device. The DC current source i s1 and the DC current source i s2 Power is supplied from both ends of the anode rod, and the current at both ends is adjustable to achieve controllable power supply; The anode rod upper end clamping device and the anode rod lower end clamping device both include a first cylinder, a first piston, a shell, a clamping sleeve, an elastic jacket and a sealing cover. The first cylinder is fixedly mounted on the electroplating equipment machine tool. One end of the first piston is connected to the first cylinder and is driven by the first cylinder to reciprocate up and down. The other end of the first piston extends into the shell and is connected to the clamping sleeve. A cavity is provided in the shell, and the clamping sleeve is arranged in the cavity. The elastic jacket is arranged in the clamping sleeve. Under the push and pull action of the first cylinder on the first piston, the clamping sleeve and the elastic jacket drive the clamping sleeve to reciprocate up and down. The clamping sleeve and the elastic jacket are squeezed by the matching wedge-shaped conical surfaces to make the elastic jacket shrink inward or open outward, thereby clamping or loosening the anode rod.

2. The device for controlling chrome plating of inner wall of deep small hole and automatic clamping of electrode according to claim 1, characterized in that: The DC current source i s1 The positive electrode is connected to the elastic sleeve in the clamping device at the upper end of the anode rod, and the current is transferred from the elastic sleeve to the anode rod. The DC current source i s2 The positive electrode is connected to the elastic sleeve in the clamping device at the lower end of the anode rod, and the current is transferred from the elastic sleeve to the anode rod.

3. The device for controlling chrome plating of inner wall of deep small hole and automatic clamping of electrode according to claim 1 is characterized in that: The anode rod is a cylindrical metal rod, which is a slender tube with a deep small hole and chrome-plated anode part. The two ends of the anode rod pass through the sealing covers of the anode rod upper end clamping device and the anode rod lower end clamping device respectively, and then extend into the elastic jacket.

4. The device for controlling chrome plating of inner wall of deep small hole and automatic clamping of electrode according to claim 1, characterized in that: The cathode clamping device comprises two symmetrically arranged cathode clamping blocks, each cathode clamping block is provided with a rotating shaft and a connecting rod, the middle parts of the two cathode clamping blocks enclose a space for clamping the slender tube, the connecting rod is arranged at the rear part of the cathode clamping block, one end is hinged to the cathode clamping block, and the other end is hinged to the second piston, the right side of the second piston is connected to the second cylinder, and the second cylinder is fixedly installed on the electroplating equipment machine tool, the cathode clamping device drives the second piston to push and pull the connecting rod linearly through the second cylinder, so that the cathode clamping block rotates around the rotating shaft to clamp and release the slender tube, and when the cathode clamping device is working, it clamps the middle position of the length direction of the slender tube to make the current distribution uniform.

5. The device for controlling chrome plating on the inner wall of a deep small hole and automatic clamping of an electrode according to claim 4, characterized in that: The DC current source i s1 The negative electrode, DC current source i s2 The negative electrodes are all connected to the cathode clamping blocks of the cathode clamping device.

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