A single piece of slender tube parts equipped with independent power supply and flow chrome plating device

Abstract

The invention discloses a single-piece slender tube part equipped with an independent power supply and a flow chrome plating device, comprising an upper bracket, a lower bracket, a slender tube and an anode steel wire, and also comprising an upper bracket lifting mechanism, which is fixedly mounted on one side of the upper bracket and drives the upper bracket to move and clamp or loosen the slender tube; an anode steel wire tensioning mechanism, which is arranged below the lower bracket and is used to clamp the anode steel wire; an independent power supply system, which is arranged beside the lower bracket, the positive electrode is connected to the anode steel wire tensioning mechanism, and the negative electrode is connected to the lower bracket, so as to provide an independent power supply for the single slender tube; a pipeline circulation system and an electroplating tank, which are arranged beside the upper bracket and the lower bracket and are used to connect the upper bracket, the lower bracket and the electroplating tank to form a flow circulation loop of the electroplating liquid; a control system, which controls the up and down movement of the upper bracket lifting mechanism and the start or stop of the independent power supply system, the pipeline circulation system and the anode steel wire tensioning mechanism. The invention has a self-centering function and is convenient for implementing automated production.

Description

Technical Field

[0001] The invention belongs to the technical field of electroplating mechanical devices, and in particular relates to a single-piece slender tube part equipped with an independent power supply and a flow chrome plating device. Background Art

[0002] A long and thin tube deep hole works in a high temperature, high pressure and high speed environment, and needs to have extremely high wear resistance and ablation resistance. Ordinary metal materials are difficult to meet the requirements of this working condition. So far, metal chromium is the material with the best wear resistance and ablation resistance that has been discovered. In order to meet the working requirements of the long and thin tube, it is usually necessary to electroplate a layer of metal chromium on the surface of the metal material.

[0003] Current situation: On the one hand, when chrome is plated on the surface of a slender tube with a deep hole, generally one hanger is equipped with one power supply, and multiple slender tubes are clamped on one hanger. Due to the differences in manufacturing quality of the thickness of the anode steel wire, the thickness of the copper layer, the thickness of the lead layer, etc. configured for each slender tube, and the differences in the conductive properties of other conductive parts of the hanger due to various reasons, the current allocated to each slender tube on each hanger is inconsistent, resulting in differences in the chrome deposition rate of the inner wall of the deep hole of each slender tube, resulting in inconsistent thickness of each chrome plating layer, which greatly reduces the chrome plating pass rate and seriously affects the chrome plating quality of the product.

[0004] On the other hand, when a certain slender tube is chromium-plated, the entire slender tube is generally immersed in the chromium plating solution without a special solution flow device. We generally call this chromium plating method "immersion chromium plating". In addition to the main reaction of reducing metallic chromium and depositing it on the surface of the substrate during chromium plating, there must be a side reaction of electrolyzing more water than reducing chromium metal. When the inner wall of the deep small hole of the slender tube is "immersion chromium plating", the electroplating solution in the deep small hole mainly relies on the hydrogen and oxygen produced by the side reaction to drive the solution to circulate and replenish the consumed and diluted part in time. This method makes the circulation speed of the electroplating solution in the deep small hole slow, and it is difficult to replenish the consumed and diluted electrolyte in time. In addition, the large amount of gas gradually generated from the bottom to the top in the deep small hole in the electroplating solution seriously causes the solution resistance to gradually increase from the bottom to the top in a gradient during the electroplating process, and also affects the distribution of polarization resistance. This phenomenon directly leads to a decrease in the current density on the inner wall of the deep small hole from bottom to top, causing the metal chromium deposition rate to also decrease from bottom to top, resulting in an uneven distribution of the chrome plating thickness from bottom to top on the slender tube, which is mainly manifested in that the chromium layer is thicker at the lower end and thinner at the upper end. There are also some problems such as poor gas emission in the deep small hole caused by the deflection of the hanger, resulting in a thin chromium layer in the middle part and thicker at both ends.

[0005] This series of reasons has greatly affected the uniformity of the thickness of the chrome plating layer on the inner wall of the deep and small holes of the slender tube, greatly reduced the chrome plating pass rate, and seriously affected the performance of the product. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a single-piece slender tube part equipped with an independent power supply and a flow chrome plating device. The device has a simple structure, is easy to operate, and is convenient for implementing automated production. The anode steel wire and the slender tube have a self-centering function during the clamping and installation process, which avoids the eccentricity of the anode steel wire in the inner hole of the slender tube. The single-piece slender tube is equipped with an independent power supply, which avoids the uneven current distribution phenomenon. A special flow chrome plating device is used to accelerate the circulation of the chrome plating solution and improve the uniformity of the resistance of the solution at different depths in the slender tube.

[0007] The object of the present invention is achieved in that:

[0008] A single-piece slender tube part equipped with an independent power supply and flow chrome plating device, comprising an upper bracket and a lower bracket, the upper bracket and the lower bracket are placed vertically, a slender tube is clamped between the upper bracket and the lower bracket, and an anode steel wire is inserted into the central holes of the upper bracket, the lower bracket and the slender tube. The device also includes an upper bracket lifting mechanism, which is fixedly installed on one side of the upper bracket and is used to drive the upper bracket to move up and down, clamp or loosen the slender tube, so that the axis of the slender tube is coaxial with the axis of the anode steel wire; an anode steel wire tensioning mechanism is arranged below the lower bracket and is used to clamp the anode steel wire and make the anode steel wire have a self-centering effect, and the lower end of the anode steel wire extends into the central hole of the anode steel wire tensioning mechanism; an independent power supply system is arranged beside the lower bracket, and the positive electrode of the power supply is connected to the anode wire through the anode conductor The line is connected to the anode steel wire tensioning mechanism, and the negative pole of the power supply is connected to the lower bracket through the cathode wire, so as to provide an independent power supply for the single slender tube; the pipeline circulation system and the electroplating tank are arranged beside the upper bracket and the lower bracket, and the electroplating tank contains the electroplating solution. The pipeline circulation system is used to connect the upper bracket, the lower bracket and the electroplating tank, and the electroplating solution in the electroplating tank enters from the lower bracket, is injected upward into the slender tube, flows out from the upper bracket and returns to the electroplating tank, so as to form a flow circulation loop; the control system is electrically connected to the upper bracket lifting mechanism, the independent power supply system, the pipeline circulation system and the anode steel wire tensioning mechanism respectively, and is used to control the up and down movement of the upper bracket lifting mechanism and the start or stop of the independent power supply system, the pipeline circulation system and the anode steel wire tensioning mechanism.

[0009] Furthermore, the upper bracket includes an upper bracket body, an upper bracket stopper arranged below the upper bracket body, and an anode steel wire self-centering insulating plug, a sealing gasket a and an upper self-centering elastic jacket arranged in the upper bracket body from top to bottom in sequence, and an upper chamber and a lower chamber are vertically arranged at the center of the upper bracket body, the upper chamber is used to accommodate the anode steel wire self-centering insulating plug, limit the anode steel wire and ensure the self-centering of the anode steel wire, and the lower chamber accommodates the sealing gasket a and the upper self-centering elastic jacket. The upper self-centering elastic jacket opens or tightens radially under the action of the clamping force, clamps or loosens the slender tube and limits one end of the slender tube, so that the axis of the slender tube is coaxial with the axis of the anode steel wire. An L-shaped channel is provided between the upper chamber and the lower chamber for the electroplating solution to circulate from bottom to top. One end of the L-shaped channel extends to the side wall of the upper bracket body and is connected to the pipeline circulation system. The upper bracket stopper is used to limit the downward movement of the upper self-centering elastic jacket to avoid falling when loading and unloading the slender tube.

[0010] Furthermore, the lower bracket includes a lower bracket body, a lower bracket stopper arranged above the lower bracket body, and a lower self-centering elastic jacket, a sealing gasket b, an anode steel wire lower insulating plug, a sealing gasket c and an insulating material pressing screw arranged in the lower bracket body from top to bottom. The center of the lower bracket body is vertically provided with an upper chamber and a lower chamber. The upper chamber is used to accommodate the lower self-centering elastic jacket and the sealing gasket b. The lower self-centering elastic jacket is used to clamp or loosen the slender tube and limit the other end of the slender tube so that the axis of the slender tube is aligned with the axis of the anode steel wire. Coaxial, the sealing gasket b is used to prevent leakage of the electroplating liquid, the lower chamber accommodates the anode steel wire lower insulating plug, the sealing gasket c and the insulating material holding screw, which together form insulation and sealing effects, and guide the assembly of the anode steel wire. A cross-shaped channel is passed through the upper chamber and the lower chamber for the electroplating liquid to circulate from bottom to top. One end of the cross-shaped channel extends to the side wall of the lower bracket body and is connected to the pipeline circulation system. The lower bracket block is used to limit the upward movement of the lower self-centering elastic jacket to prevent it from being pulled out and falling during loading and unloading.

[0011] Furthermore, the pipeline circulation system includes a liquid inlet pipeline, a liquid discharge pipeline, a water pump, a solenoid valve and a flow meter. The liquid inlet pipeline is connected to the cross-shaped channel of the lower bracket body, and the liquid discharge pipeline is connected to the L-shaped channel of the upper bracket body. The water pump is arranged in the electroplating tank and is used to extract the plating liquid from the electroplating tank and send it into the liquid inlet pipeline. The solenoid valve and the flow meter are arranged on the liquid inlet pipeline. The solenoid valve is used to open or close the liquid supply / discharge, and the flow meter is used to control the flow rate of the plating liquid. The plating liquid is injected into the inner hole of the slender tube from bottom to top through the liquid inlet pipeline, and flows out upward from the liquid discharge pipeline to circulate into the electroplating tank.

[0012] Furthermore, the anode steel wire tensioning mechanism includes a self-centering chuck and a hydraulic cylinder connected to the chuck and arranged below the self-centering chuck. The self-centering chuck is used to clamp the anode steel wire and make the anode steel wire self-centering. The hydraulic cylinder drives the anode steel wire through the movement of the hydraulic cylinder piston to straighten and tighten the anode steel wire.

[0013] Furthermore, a metal gasket and a sealing ring are tightly fitted in the center hole of the upper self-centering elastic jacket. The sealing ring is sleeved on the lower end of the metal gasket. The inner hole diameter of the metal gasket is consistent with the inner hole diameter of the slender tube, so that the electric field lines in the holes at both ends of the slender tube remain consistent with the state of the inner hole during electroplating. The sealing ring is used for sealing to prevent leakage of the electroplating solution.

[0014] Furthermore, the upper chamber of the upper bracket body is an upper circular and lower conical structure, which cooperates with the self-centering insulating plug of the anode steel wire. The self-centering insulating plug of the anode steel wire guides and self-centers the anode steel wire for downward assembly. A conical hole is provided at the bottom of the lower chamber of the upper bracket body, which cooperates with the conical part of the upper self-centering elastic jacket to form self-centering.

[0015] Furthermore, a metal gasket and a sealing ring are tightly fitted in the center hole of the lower self-centering elastic jacket. The sealing ring is sleeved on the upper end of the metal gasket. The inner hole diameter of the metal gasket is consistent with the inner hole diameter of the slender tube, so that the electric field lines in the holes at both ends of the slender tube remain consistent with the state of the inner hole during electroplating. The sealing ring is used for sealing to prevent leakage of the electroplating solution.

[0016] Furthermore, a conical hole is provided on the top of the upper chamber of the lower bracket body, which cooperates with the conical part of the lower self-centering elastic jacket to form self-centering. A conical hole is provided on the upper part of the lower insulating plug of the anode steel wire to guide the downward assembly of the anode steel wire, and a through hole is provided in the internal center to cooperate with the anode steel wire.

[0017] Furthermore, the upper end of the anode steel wire is arranged as a conical head, and the top of the anode steel wire self-centering insulating plug is axially provided with a conical hole matching the conical head of the anode steel wire, so that the anode steel wire forms self-centering when assembled downward.

[0018] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0019] 1. The present invention has a simple structure, is easy to use, has reliable positioning, and has automated operation conditions. The anode steel wire and the slender tube have a self-centering function during the clamping and installation process, thereby avoiding the eccentricity of the anode steel wire in the inner hole of the slender tube and reducing the unevenness of the thickness of the chrome plating layer on the inner wall of the slender tube along the circumferential direction;

[0020] 2. The single-piece slender tube is equipped with an independent power supply, which avoids the uneven current distribution between different workpieces caused by the traditional method of multiple slender tubes equipped with one power supply;

[0021] 3. A special flow chrome plating device is used. Through the flow chrome plating method, the plating solution in the inner hole of the slender tube can circulate in time, speed up the flow of the plating solution, and take away the gas generated by the side reaction in time, which reduces the resistance drop from top to bottom of the plating solution in the inner hole of the slender tube, improves the current uniformity of each part of the deep hole, and reduces the diameter cone difference at both ends of the inner hole after chrome plating;

[0022] 4. The closed pipeline circulation system prevents the chromium mist generated during the electroplating process from diffusing into the environment, thus avoiding corrosion and pollution to the environment;

[0023] 5. It has greatly improved the processing quality and performance of the product, and has high economic benefits and social value. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the upper bracket structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the lower bracket structure of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the anode steel wire tensioning mechanism of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the upper self-centering elastic jacket of the present invention;

[0029] Reference numerals

[0030] In the attached drawings, 1 is the upper support lifting mechanism, 2 is the upper support, 3 is the slender tube (workpiece), 4 is the anode steel wire, 5 is the lower support, 6 is the anode steel wire tensioning mechanism, 7 is the independent power supply system, 8 is the electroplating solution, 9 is the electroplating tank, 10 is the pipeline circulation system, and 11 is the control system

[0031] 21 is the upper bracket body; 22 is the L-shaped channel; 23 is the sealing gasket a; 24 is the upper self-centering elastic jacket; 25 is the upper bracket stopper; 26 is the anode steel wire self-centering insulating plug;

[0032] 41 is a conical head;

[0033] 51 is a lower bracket stopper, 52 is a lower bracket body, 53 is an anode steel wire lower insulating plug, 54 is a sealing gasket c, 55 is an insulating material pressing screw, 56 is a lower self-centering elastic jacket, 57 is a sealing gasket b, and 58 is a cross-shaped channel;

[0034] 61 is a self-centering chuck, 62 is a hydraulic cylinder, and 63 is a hydraulic cylinder piston;

[0035] 71 is an anode wire, 72 is a cathode wire;

[0036] 10-1 is a liquid inlet pipe, 10-2 is a liquid discharge pipe, 10-3 is a water pump, 10-4 is a solenoid valve, and 10-5 is a flow meter;

[0037] 21-1 is the tapered hole of the lower chamber of the upper bracket body

[0038] 24-1 is a sealing ring, 24-2 is the conical part of the upper self-centering elastic jacket, and 24-3 is a metal gasket;

[0039] 52-1 is a tapered hole of the upper chamber of the lower support body;

[0040] 53-1 is the tapered hole of the insulating plug under the anode steel wire. DETAILED DESCRIPTION

[0041] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0042] See also Figure 1-Figure 5 , a single-piece slender tube part equipped with an independent power supply and a flow chrome plating device, which is used to chrome-plate the inner wall of the deep hole of the slender tube, comprising an upper bracket 2 and a lower bracket 5, the upper bracket 2 and the lower bracket 5 are placed vertically, and a slender tube 3 is clamped between the upper bracket 2 and the lower bracket 5, and an anode steel wire 4 is passed through the central hole of the upper bracket 2, the lower bracket 5 and the slender tube 3. During chrome plating, the upper bracket 2 and the lower bracket 5 are respectively installed together with the two ends of the slender tube 3 through a hole-axis matching method, ensuring that the slender tube 3 is clamped on the chrome plating device in a vertically placed state, so that the electroplating solution can be evenly filled in the inner hole of the slender tube 3, and can flow from bottom to top along the inner hole of the slender tube 3, and circulate in time to replenish the consumed electroplating solution and discharge the hydrogen and oxygen generated during the electroplating process;

[0043] The chrome plating device also includes an upper bracket lifting mechanism 1, which is fixedly installed on one side of the upper bracket 2. The upper bracket lifting mechanism 1 is controlled by a control system 11 to drive the upper bracket 2 to move up and down, so that the upper self-centering elastic jacket 24 in the upper bracket 2 can move up and down manually or automatically, so as to achieve the function of clamping and clamping the slender tube 3, so that the axis of the slender tube 3 is coaxial with the axis of the anode steel wire 4;

[0044] like Figure 4 As shown, the anode steel wire tensioning mechanism 6 is arranged below the lower bracket 5, and is used to clamp the anode steel wire 4 and make the anode steel wire 4 self-centering. The lower end of the anode steel wire 4 extends into the center hole of the anode steel wire tensioning mechanism 6; Figure 4As shown, the anode steel wire tensioning mechanism 6 includes a self-centering chuck 61 and a hydraulic cylinder 62 connected to the chuck and arranged below the self-centering chuck 51. The self-centering chuck 61 is used to clamp the anode steel wire 4 and make the anode steel wire 4 have a self-centering effect. The hydraulic cylinder 62 drives the anode steel wire 4 through the push-pull action of the hydraulic cylinder piston 63 to straighten and tighten the anode steel wire 4.

[0045] An independent power supply system 7, i.e., each slender tube is equipped with an independent power supply, which is arranged beside the lower bracket 5, the positive electrode of the power supply is connected to the anode steel wire tensioning mechanism 6 through the anode wire 71, and the negative electrode of the power supply is connected to the lower bracket 5 through the cathode wire 72, so as to provide independent power supply for the single slender tube;

[0046] The pipeline circulation system 10 and the electroplating tank 9 are arranged beside the upper support 2 and the lower support 5. The electroplating tank 9 contains the electroplating solution 8. The pipeline circulation system 10 is used to connect the upper support 2, the lower support 5 and the electroplating tank 9, and the electroplating solution 8 in the electroplating tank 9 enters from the lower support 5, is injected upward into the slender tube 3, flows out from the upper support 2 and returns to the electroplating tank 9, forming a flow circulation loop;

[0047] The control system 11 is electrically connected to the upper support lifting mechanism 1, the independent power supply system 7, the pipeline circulation system 10 and the anode steel wire tensioning mechanism 6, respectively, and is used to control the up and down movement of the upper support lifting mechanism 1 and the start or stop of the independent power supply system 7, the pipeline circulation system 10 and the anode steel wire tensioning mechanism 6.

[0048] like Figure 2 , Figure 5As shown, in this embodiment, the upper bracket 2 includes an upper bracket body 21, an upper bracket stopper 25 fixedly connected to the lower part of the upper bracket body 21, and an anode steel wire self-centering insulating plug 26, a sealing gasket a23 and an upper self-centering elastic jacket 24 arranged in the upper bracket body 21 from top to bottom. The center of the upper bracket body 21 is vertically provided with an upper chamber and a lower chamber, and the upper chamber is used to accommodate the anode steel wire self-centering insulating plug 26, which limits the anode steel wire 4 The lower chamber contains a sealing gasket a23 and an upper self-centering elastic jacket 24. The upper self-centering elastic jacket 24 opens or tightens radially under the clamping force, clamps or loosens the slender tube 3 and limits one end of the slender tube 3, so that the axis of the slender tube 3 is coaxial with the axis of the anode steel wire 4. An L-shaped channel 22 is provided between the upper chamber and the lower chamber for the electroplating solution 8 to circulate from bottom to top. One end of the L-shaped channel 22 extends to the upper support The side wall of the frame body 21 is connected to the pipeline circulation system 10. The upper support block 25 is used to limit the downward movement of the upper self-centering elastic jacket 24 to prevent it from falling when loading and unloading the slender tube. The upper chamber of the upper support body 21 is an upper round and lower conical structure, which cooperates with the anode steel wire self-centering insulating plug 26. The anode steel wire self-centering insulating plug 26 guides and self-centers the anode steel wire 4 downward assembly. The center hole of the upper self-centering elastic jacket 24 is tightly fitted with a metal washer 2 4-3 and a sealing ring 24-1, the sealing ring 24-1 is sleeved on the lower end of the metal gasket 24-3, the inner hole diameter of the metal gasket 24-3 is consistent with the inner hole diameter of the slender tube 3, so that the electric field lines in the holes at both ends of the slender tube remain consistent with the state of the inner hole during electroplating, and the sealing ring 24-1 is used for sealing to prevent leakage of the electroplating solution. A conical hole 21-1 is provided at the bottom of the lower chamber of the upper bracket body 21, which cooperates with the conical part 24-2 of the upper self-centering elastic jacket to form self-centering.

[0049] like Figure 3As shown, in this embodiment, the lower bracket 5 includes a lower bracket body 52, a lower bracket stopper 51 arranged above the lower bracket body 52, and a lower self-centering elastic jacket 56, a sealing gasket b57, an anode steel wire lower insulating plug 53, a sealing gasket c54 and an insulating material pressing screw 55 arranged in the lower bracket body 52 from top to bottom. The center of the lower bracket body 52 is vertically provided with an upper chamber and a lower chamber, and the upper chamber is used to accommodate the lower self-centering elastic jacket 56 and the sealing gasket b5 7, the lower self-centering elastic jacket 56 is used to clamp or loosen the slender tube 3 and limit the other end of the slender tube, so that the axis of the slender tube 3 is coaxial with the axis of the anode steel wire 4, the sealing gasket b57 is used to prevent the electroplating solution 8 from leaking, the lower chamber contains the anode steel wire lower insulating plug 53, the sealing gasket c54 and the insulating material pressing screw 55, the three together play the role of insulation and sealing, and form a guide for the assembly of the anode steel wire 4, the upper chamber and the lower chamber are connected by a cross-shaped channel 58 for electroplating The liquid 8 circulates from bottom to top, one end of the cross-shaped channel 58 extends to the side wall of the lower bracket body 52 and is connected to the pipeline circulation system 10. The lower bracket stopper 51 is used to limit the upward movement of the lower self-centering elastic jacket 56 to prevent it from being pulled out and falling during loading and unloading. The top of the upper chamber of the lower bracket body 52 is provided with a tapered hole 52-1, which cooperates with the conical part of the lower self-centering elastic jacket 56 to form self-centering. The upper part of the anode steel wire lower insulating plug 53 is provided with a tapered hole 53-1 , guide the anode steel wire 4 to be assembled downward, a through hole is provided in the inner center, which cooperates with the anode steel wire 4, and a metal gasket 24-3 and a sealing ring 24-1 are tightly fitted in the center hole of the lower self-centering elastic jacket 56. The sealing ring 24-1 is sleeved on the upper end of the metal gasket 24-3. The inner hole diameter of the metal gasket 24-3 is consistent with the inner hole diameter of the slender tube 3, so that the electric field lines in the holes at both ends of the slender tube remain consistent with the inner hole state during electroplating. The sealing ring 24-1 is used for sealing to prevent leakage of the electroplating solution.

[0050] The pipeline circulation system 10 includes a liquid inlet pipeline 10-1, a liquid discharge pipeline 10-2, a water pump 10-3, a solenoid valve 10-4 and a flow meter 10-5. The liquid inlet pipeline 10-1 is connected to the cross-shaped channel 58 of the lower bracket body, and the liquid discharge pipeline 10-2 is connected to the L-shaped channel 22 of the upper bracket body. The water pump 10-3 is arranged in the electroplating tank 9, and is used to extract the electroplating liquid 8 from the electroplating tank 9 and send it into the liquid inlet pipeline 10-1. The solenoid valve 10-4 and the flow meter 10-5 are arranged on the liquid inlet pipeline 10-1. The solenoid valve 10-4 is used to open or close the liquid supply / drainage, and the flow meter 10-5 is used to control the flow rate of the electroplating liquid 8. The electroplating liquid 8 is injected from the bottom to the top into the inner hole of the slender tube 3 through the liquid inlet pipeline 10-1, and flows out upward from the liquid discharge pipeline 10-2 to circulate into the electroplating tank 9.

[0051] The slender tube 3 described in the present invention is a cylindrical slender tube-like part, and is a workpiece to be electroplated by the device.

[0052] The anode steel wire 4 in the present invention is a cylindrical anode whose surface layer is made of an inert metal material to avoid dissolution under the action of electric current. The upper end is provided with a conical head 41. The top of the anode steel wire self-centering insulating plug 26 is axially provided with a conical hole matching the conical head 41 of the anode steel wire, so that the anode steel wire 4 can be self-centering when assembled downward.

[0053] The chromium plating device of the present invention has a simple structure, is easy to operate, and is convenient for implementing automated production. The single-piece slender tube is equipped with an independent power supply, which avoids the uneven current distribution between different workpieces caused by the traditional multiple slender tubes equipped with one power supply. The special flow chromium plating device is adopted to accelerate the circulation of the chromium plating solution and improve the uniformity of the solution resistance at different depths in the slender tube. It is an important measure to ensure the uniformity of the current density, current efficiency and metal chromium deposition rate at various parts of the inner wall of the deep hole of the slender tube. During the entire electroplating process, the plating solution circulates in a closed pipeline to prevent chromium mist from diffusing into the air, reduce environmental pollution, and improve environmental protection capabilities.

[0054] 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 single-piece slender tube part equipped with an independent power supply and flow chrome plating device, comprising an upper bracket and a lower bracket, the upper bracket and the lower bracket are placed vertically, a slender tube is clamped between the upper bracket and the lower bracket, and an anode steel wire is inserted into the central hole of the upper bracket, the lower bracket and the slender tube, characterized in that: Also includes The upper bracket lifting mechanism is fixedly installed on one side of the upper bracket and is used to drive the upper bracket to move up and down, clamp or loosen the slender tube, so that the axis of the slender tube is coaxial with the axis of the anode steel wire; An anode steel wire tensioning mechanism is arranged below the lower bracket and is used to clamp the anode steel wire and make the anode steel wire self-centering. The lower end of the anode steel wire extends into the center hole of the anode steel wire tensioning mechanism. An independent power supply system is arranged beside the lower bracket, the positive electrode of the power supply is connected to the anode steel wire tensioning mechanism through the anode wire, and the negative electrode of the power supply is connected to the lower bracket through the cathode wire, so as to provide independent power supply for the single slender tube; The pipeline circulation system and the electroplating tank are arranged beside the upper support and the lower support. The electroplating tank contains the electroplating solution. The pipeline circulation system is used to connect the upper support, the lower support and the electroplating tank. The electroplating solution in the electroplating tank enters from the lower support, is injected upward into the slender tube, flows out from the upper support and returns to the electroplating tank, forming a flow circulation loop; A control system, which is electrically connected to the upper support lifting mechanism, the independent power supply system, the pipeline circulation system and the anode steel wire tensioning mechanism, and is used to control the up and down movement of the upper support lifting mechanism and the start or stop of the independent power supply system, the pipeline circulation system and the anode steel wire tensioning mechanism; The upper bracket comprises an upper bracket body, an upper bracket stopper arranged below the upper bracket body, and an anode steel wire self-centering insulating plug, a sealing gasket a and an upper self-centering elastic jacket arranged in the upper bracket body from top to bottom in sequence. An upper chamber and a lower chamber are vertically arranged at the center of the upper bracket body. The upper chamber is used to accommodate the anode steel wire self-centering insulating plug, limit the anode steel wire and ensure the self-centering of the anode steel wire. The sealing gasket a and the upper self-centering elastic jacket are accommodated in the lower chamber. The upper self-centering elastic jacket opens or tightens radially under the action of the clamping force, clamps or loosens the slender tube and limits one end of the slender tube, so that the axis of the slender tube is coaxial with the axis of the anode steel wire. An L-shaped channel is arranged between the upper chamber and the lower chamber for the electroplating solution to circulate from bottom to top. One end of the L-shaped channel extends to the side wall of the upper bracket body and is connected to the pipeline circulation system. The upper bracket stopper is used to limit the downward movement of the upper self-centering elastic jacket to avoid falling when loading and unloading the slender tube.

2. A device for providing a single slender tube component with an independent power supply and a flow chrome plating device according to claim 1, characterized in that: The lower bracket includes a lower bracket body, a lower bracket stopper arranged above the lower bracket body, and a lower self-centering elastic jacket, a sealing gasket b, an anode steel wire lower insulating plug, a sealing gasket c and an insulating material pressing screw arranged in the lower bracket body from top to bottom. An upper chamber and a lower chamber are vertically arranged at the center of the lower bracket body. The upper chamber is used to accommodate the lower self-centering elastic jacket and the sealing gasket b. The lower self-centering elastic jacket is used to clamp or loosen the slender tube and limit the other end of the slender tube so that the axis of the slender tube is coaxial with the axis of the anode steel wire. The sealing gasket b is used to prevent leakage of the electroplating liquid. The lower chamber contains the lower insulating plug of the anode steel wire, the sealing gasket c and the insulating material holding screw, which together form an insulating and sealing effect and guide the assembly of the anode steel wire. A cross-shaped channel is passed through the upper chamber and the lower chamber for the electroplating liquid to circulate from bottom to top. One end of the cross-shaped channel extends to the side wall of the lower bracket body and is connected to the pipeline circulation system. The lower bracket block is used to limit the upward movement of the lower self-centering elastic jacket to prevent it from being pulled out and falling during loading and unloading.

3. A device for providing a single slender tube component with an independent power supply and a flow chrome plating device according to claim 2, characterized in that: The pipeline circulation system includes a liquid inlet pipeline, a liquid discharge pipeline, a water pump, a solenoid valve and a flow meter. The liquid inlet pipeline is connected to the cross-shaped channel of the lower bracket body, and the liquid discharge pipeline is connected to the L-shaped channel of the upper bracket body. The water pump is arranged in the electroplating tank and is used to extract the electroplating liquid from the electroplating tank and send it into the liquid inlet pipeline. The solenoid valve and the flow meter are arranged on the liquid inlet pipeline. The solenoid valve is used to open or close the liquid supply / drainage, and the flow meter is used to control the flow rate of the electroplating liquid. The electroplating liquid is injected into the inner hole of the slender tube from bottom to top through the liquid inlet pipeline, and flows out upward from the liquid discharge pipeline to circulate into the electroplating tank.

4. A single-piece slender tube component equipped with an independent power supply and a flow chrome plating device according to claim 1, characterized in that: The anode steel wire tensioning mechanism includes a self-centering chuck and a hydraulic cylinder connected to the chuck and arranged below the self-centering chuck. The self-centering chuck is used to clamp the anode steel wire and make the anode steel wire self-centering. The hydraulic cylinder drives the anode steel wire through the movement of the hydraulic cylinder piston to straighten and tighten the anode steel wire.

5. The device for providing a single slender tube component with an independent power supply and a flow chrome plating device according to claim 1, characterized in that: A metal washer and a sealing ring are tightly fitted in the center hole of the upper self-centering elastic jacket. The sealing ring is sleeved on the lower end of the metal washer. The inner hole diameter of the metal washer is consistent with the inner hole diameter of the slender tube, so that the electric field lines in the holes at both ends of the slender tube remain consistent with the state of the inner hole during electroplating. The sealing ring is used for sealing to prevent leakage of the electroplating solution.

6. The device for providing a single slender tube component with an independent power supply and a flow chrome plating device according to claim 1, characterized in that: The upper chamber of the upper bracket body is a circular upper and conical lower structure, which cooperates with the self-centering insulating plug of the anode steel wire. The self-centering insulating plug of the anode steel wire guides and self-centers the anode steel wire for downward assembly. A conical hole is provided at the bottom of the lower chamber of the upper bracket body, which cooperates with the conical part of the upper self-centering elastic jacket to form self-centering.

7. The device for providing a single slender tube component with an independent power supply and a flow chrome plating device according to claim 2, characterized in that: A metal washer and a sealing ring are tightly fitted in the center hole of the lower self-centering elastic jacket. The sealing ring is sleeved on the upper end of the metal washer. The inner hole diameter of the metal washer is consistent with the inner hole diameter of the slender tube, so that the electric field lines in the holes at both ends of the slender tube remain consistent with the state of the inner hole during electroplating. The sealing ring is used for sealing to prevent leakage of the electroplating solution.

8. The device for providing a single slender tube component with an independent power supply and a flow chrome plating device according to claim 2, characterized in that: A conical hole is provided on the top of the upper chamber of the lower bracket body, which cooperates with the conical part of the lower self-centering elastic jacket to form self-centering. A conical hole is provided on the upper part of the lower insulating plug of the anode steel wire to guide the downward assembly of the anode steel wire, and a through hole is provided in the inner center to cooperate with the anode steel wire.

9. The device for providing a single slender tube component with an independent power supply and a flow chrome plating device according to claim 1, characterized in that: The upper end of the anode steel wire is arranged as a conical head, and the top of the anode steel wire self-centering insulating plug is axially provided with a conical hole matching with the conical head of the anode steel wire, so that the anode steel wire forms self-centering when assembled downward.

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