Anode device for chroming inner hole of large-length-diameter-ratio reducer pipe

Abstract

The utility model belongs to the technical field of electroplating, and discloses an anode device for chroming an inner hole of a large-length-diameter-ratio reducer pipe, which comprises an anode cable (1), a collector head (2), an anode bar (3), a positioning taper sleeve (5), an upper extension pipe (7) and a lower extension pipe (8), the upper extension pipe (7) is connected and fastened with the upper end of the plating piece (6) through a spigot, and the lower extension pipe (8) is connected and fastened with the lower end of the plating piece (6) through a spigot; and one end of the anode bar (3) is firstly in threaded connection with the outer guide sleeve, and then is in threaded connection with the current collecting head (2). According to the utility model, the problems that the connection between the anode cable and the current collecting head is loosened and virtually connected, the guide sleeve falls off and displaces, the inner wall is scratched, the positioning taper sleeve is blocked, the anode cable and the anode bar are ablated, and the normal use of the chromium plating device is influenced can be effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electroplating, and particularly relates to an anode device used for chromium plating of inner holes of variable diameter pipes with a large aspect ratio. Background Art

[0002] like Figure 1 As shown, the existing inner hole chrome plating anode device of large-diameter reducer pipe parts (also called plated parts) is to connect the anode cable and the anode rod through the collector head and conduct the positive current, fix the plated part in the plating solution, and the anode rod is inserted into the plated part and reciprocates up and down for a certain period of time to achieve chrome plating of the inner hole of the plated part. In order to make the inner hole chrome plating layer uniform, it is necessary to ensure that the anode rod is always in the center of the inner hole of the plated part.

[0003] The anode rod is fixed in the center of the straight bore part of the inner hole of the plated part by a guide sleeve, whose outer diameter matches the inner diameter of the straight bore part of the inner hole of the plated part, and whose inner diameter matches the outer diameter of the anode rod. The guide sleeve is sleeved on the anode rod, and has a countersunk hole for matching with the set screw. The end face of the guide sleeve is petal-shaped, which is convenient for the liquid to flow unimpeded in the plated part.

[0004] The anode rod is guided and positioned by the positioning cone sleeve, and is guided to extend from the end of the plated component into its interior without friction and to be located in the center of the plated component. It is a cylindrical part with a blind hole. The inner diameter of the blind hole matches the outer diameter of the anode rod. It is sleeved on the anode rod, and the outer diameter matches the inner diameter of the straight bore part of the plated component. The outer edge of the bottom is arc-shaped, and a countersunk hole for matching with a set screw is opened on it. The end face of the positioning cone sleeve is petal-shaped, which facilitates the unimpeded flow of liquid in the plated component.

[0005] The above positioning method is effective for parts with an aspect ratio of ≤40, but when it is used for chrome plating of the inner hole of a reducer part (consisting of a long straight bore and a short bell mouth) with a long length (≥1400mm) and a large aspect ratio (41-70), the effective length of the anode remains unchanged and the anode travel increases due to the increase in the length of the part. When the coating thickness remains unchanged, the electroplating time is extended. The existing anode device for chrome plating of the inner hole of a reducer part with a large aspect ratio has the following problems during use:

[0006] 1. The anode cable and the collector are tightly plugged in and connected by soldering. During use, due to gravity and stretching, the connection may become loose, virtual, the anode cable may burn out, or the anode may burn out, interrupting the electroplating process.

[0007] 2. The three guide sleeves are fixed on the anode rod by set screws. During use, due to friction and gravity, once the set screws are loosened, the three guide sleeves will move on the anode rod and fail to play a guiding role, affecting the uniformity of the coating. At the same time, they will also scratch the inner wall and affect the appearance quality of the coating.

[0008] 3. The positioning cone sleeve is also fixed to the anode rod by a set screw. The outer edge of the bottom is arc-shaped, and the guide section is short. When entering and exiting the inner hole, especially when entering and exiting the inner hole with a changing cross-section, jamming may occur, resulting in local deviation of the coating thickness and rework. Utility Model Content

[0009] The technical problems to be solved by the utility model are: the connection between the anode cable and the collector is loose and virtual, the guide sleeve falls off and shifts, scratches the inner wall, the positioning cone sleeve is stuck, the anode cable and the anode rod are burned, affecting the normal use of the chrome plating device and further affecting the quality of the coating.

[0010] In order to solve the above technical problems, the specific technical solutions of the utility model are as follows:

[0011] An anode device for chrome plating the inner hole of a large aspect ratio reducer comprises an anode cable 1, a collector head 2, an anode rod 3, a positioning cone sleeve 5, an upper connecting tube 7 and a lower connecting tube 8; the upper connecting tube 7 is connected and fastened to the upper end of a plated piece 6 through a stopper, and the lower connecting tube 8 is connected and fastened to the lower end of the plated piece 6 through a stopper; one end of the anode rod 3 is firstly threadedly connected to an outer guide sleeve, and then threadedly connected to the collector head 2 after the connection, two middle guide sleeves are sleeved on the anode rod, and the connection between the middle guide sleeve and the anode rod 3 is wrapped and positioned with PVC insulating tape to prevent the middle guide sleeve from moving along the anode rod 3; one end of the anode cable 1 is fixed in the collector head 2 by soldering, the anode rod 3 is connected to the anode cable 1 through the collector head 2, and the anode rod 3 is threadedly connected to the collector head 2 to conduct the current in the anode cable 1; the positioning cone sleeve 5 is fixed to the bottom of the anode rod 3 by threading.

[0012] Wherein, both ends of the anode rod 3 are threaded structures.

[0013] The outer guide sleeve and the middle guide sleeve are used to position the anode rod 3 .

[0014] The outer diameters of the side guide sleeves and the middle guide sleeves match the inner diameter of the straight bore portion of the inner hole of the plated component 6, and the end faces are petal-shaped.

[0015] Among them, the end face of the positioning cone sleeve is petal-shaped.

[0016] The utility model has the following advantages: it can effectively solve the problems of loose connection and virtual connection between anode cable and collector head, falling and displacement of guide sleeve, scratching inner wall, stuck positioning cone sleeve, anode cable and anode rod burning, affecting the normal use of chrome plating device. It avoids the interruption of electroplating process, reduces rework of plated parts, and effectively improves the quality of plating and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the anode device originally used for chrome plating of the inner hole of the parts;

[0018] Figure 2 This is a schematic structural diagram of an anode device for chrome plating the inner hole of a large aspect ratio reducer tube according to the utility model;

[0019] Figure 3 This is a schematic diagram of the positional relationship of various components when the anode rod moves from the plated piece to the bottom of the lower connecting tube.

[0020] Among them, 1 is anode cable, 2 is collector head, 3 is anode rod, 4 is guide sleeve, 5 is positioning cone sleeve, 6 is plated part, 7 is upper connecting long tube, 8 is lower connecting long tube, and 9 is set screw. DETAILED DESCRIPTION

[0021] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0022] like Figure 2-Figure 3 As shown, the anode device for chrome plating of the inner hole of a large aspect ratio reducer tube of the utility model comprises the following parts:

[0023] Anode cable 1, collector head 2, anode rod 3, guide sleeve 4, positioning cone sleeve 5, plated part 6, upper connecting long tube 7, lower connecting long tube 8;

[0024] in,

[0025] (1) Anode cable 1, used for conducting current and connected to the rectifier;

[0026] (2) The collector head 2 is used to connect the anode cable 1 and the anode rod 3. Compared with the previous collector head, the structure of the collector head 2 has been optimized and improved, and the overall length has been shortened, which effectively prevents the anode from being exposed to the liquid surface during electroplating, causing power failure, dry burning, and even anode burnout;

[0027] (3) Anode rod 3, serving as the positive electrode during electroplating, is used to conduct current and deposit chromium ions on the tube wall; compared with the previous anode rod, the structure of anode rod 3 has been optimized and improved, and both ends of anode rod 3 have been changed to threaded structures to facilitate the connection and fixation of guide sleeve 4 and positioning cone sleeve 5;

[0028] (4) Guide sleeve 4, used to position anode rod 3, so that anode rod 3 is always kept at the center of plated object 6 during electroplating process. Compared with previous guide sleeves, guide sleeve 4 has been optimized and improved in structure, and the guide length has been increased. The inner part of outer guide sleeve 4a is a stepped hole, which is connected to one end of anode rod 3 by threaded connection. The middle guide sleeves 4b and 4c are through holes, which are sleeved on anode rod 3. The connection between the two ends of guide sleeves 4b and 4c and anode rod 3 is wrapped with PVC insulating tape for positioning, so as to prevent guide sleeves 4b and 4c from moving along anode rod 3. After wrapping, the outer diameter of insulating tape should be larger than the diameter of anode rod 3. The outer diameter of guide sleeves 4a, 4b and 4c matches the inner diameter of the straight bore part of the inner hole of plated object 6, and the end face is petal-shaped, so as to facilitate the unimpeded flow of liquid in the plated object;

[0029] (5) Positioning cone sleeve 5, used for guiding and positioning anode rod 3. Compared with the previous positioning cone sleeve, the positioning cone sleeve 5 has been optimized and improved in structure, with increased guiding and tapered length. It is shaped like a long cylindrical part with a tapered end. At the beginning of electroplating, under the action of the positioning cone sleeve 5, anode rod 3 is introduced into the inner hole of the tube. During the electroplating process, anode rod 3 is always kept at the center of plated part 6. Its outer diameter matches the inner diameter of the straight bore part of the inner hole of plated part 6, and its end face is petal-shaped, which is convenient for the liquid to flow unimpeded in plated part 6;

[0030] (6) After the plated workpiece 6 is energized with current, a chromium layer is deposited on the surface of the plated workpiece 6 as the anode rod 3 moves up and down.

[0031] (7) The upper connecting tube 7 mainly plays the role of cathodic protection, making the electric line distribution at the upper end of the plated part 6 uniform, and also guides the anode rod 3 into the plated part 6. Compared with the previous upper connecting tube, the structure of the upper connecting tube 7 is optimized and improved, and the connection mode with the plated part 6 is changed from clamp connection to stop connection;

[0032] (8) The lower connecting tube 8 mainly plays the role of cathodic protection, guiding the anode rod 3 to run out of the plated part, so that the electric lines of the tapered aperture at the lower end of the plated part 6 are evenly distributed. Compared with the previous lower connecting tube, the structure of the lower connecting tube 8 is optimized and improved, and the connection method with the plated part 6 is changed from a clamp connection to a stopper connection;

[0033] The connection relationship between the above-mentioned components is as follows: the upper connecting tube 7 is connected and fastened to the upper end of the plated piece 6 through a stopper, and the lower connecting tube 8 is connected and fastened to the lower end of the plated piece 6 through a stopper; one end of the anode rod 3 is first threadedly connected to the outer guide sleeve 4a, and then connected to the collector head 2 through a thread. The two middle guide sleeves 4b and 4c are sleeved on the anode rod, and the connection between the guide sleeves 4b and 4c and the anode rod 3 is wrapped and positioned with PVC insulating tape to prevent the guide sleeves 4b and 4c from moving along the anode rod 3. After wrapping, the outer diameter of the insulating tape must be larger than the diameter of the anode rod 3; one end of the anode cable 1 is fixed in the collector head 2 by soldering, the anode rod 3 is connected to the anode cable 1 through the collector head 2, and the anode rod 3 and the collector head 2 are threadedly connected to conduct the current in the anode cable 1; the positioning cone sleeve 5 is fixed to the bottom of the anode rod 3 by a threaded connection.

[0034] The specific working process of this device is as follows:

[0035] Step 1: The upper connecting tube 7 is connected and fastened to the upper end of the plated component 6 through a stopper, and the lower connecting tube 8 is connected and fastened to the lower end of the plated component 6 through a stopper;

[0036] Step 2: The anode rod 3 is firstly connected with the guide sleeve 4a by thread, and then connected with the collector head 2 by thread. The two middle guide sleeves 4b and 4c are sleeved on the anode rod. The connection between the anode rod 3 and the guide sleeves 4b and 4c is wrapped with PVC insulating tape to prevent the guide sleeves 4b and 4c from moving along the anode rod 3. After wrapping, the outer diameter of the insulating tape should be larger than the diameter of the anode rod 3.

[0037] Step 3: After soldering, the anode cable 1 and the collector head 2 are fastened with hydraulic pliers, and the connection is tightly wrapped with PVC insulating tape and sealed with heat shrink tube;

[0038] Step 4: Fasten the positioning cone sleeve 5 to the bottom of the anode rod 3 through threaded connection;

[0039] Step 5: Lift the plated workpiece 6 to the plating tank, start the power supply, set the stroke, temperature and electroplating time of the anode rod 3. Adjust the starting position of the anode rod 3 to ensure that the distance between the upper end of the collector head 2 and the upper connecting tube 7 connected to the upper end of the plated workpiece 6 is ≥100mm. Start the electroplating equipment and test run 2 to 3 strokes to ensure that the anode rod runs in the inner hole without jamming and lag, and then close the equipment;

[0040] Step 6: Add chromium plating solution to make the plating solution submerge the upper connecting tube 7, and the height of the upper connecting tube 7 from the liquid surface is ≥100mm. Ensure that the anode rod 3 is always running in the plating solution to avoid power failure due to leaving the liquid surface;

[0041] Step 7: Start the electroplating equipment, and the anode rod 3 moves up and down along with the movement of the winch drum until the set coating thickness is reached.

[0042] After practical verification, it has been found that by adopting the device of the utility model, the anode cable and the collector head are tightly connected, the guide sleeve will not fall off, shift, or scratch the inner wall, the positioning cone sleeve will not get stuck, the anode cable and the anode rod will not be burned, thus avoiding interruptions in the electroplating process, reducing rework of plated parts, and effectively improving the quality of the coating.

[0043] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make several modifications and improvements without departing from the principle of the present invention, and these modifications and improvements should also be considered to belong to the protection scope of the present invention.

Claims

1. An anode device for chromium plating the inner hole of a large aspect ratio reducer tube, characterized in that: The invention comprises an anode cable (1), a collector head (2), an anode rod (3), a positioning cone sleeve (5), an upper connecting tube (7) and a lower connecting tube (8); the upper connecting tube (7) is connected and fastened to the upper end of a plated component (6) through a stopper, and the lower connecting tube (8) is connected and fastened to the lower end of the plated component (6) through a stopper; one end of the anode rod (3) is firstly connected to an outer guide sleeve by thread, and then connected to the collector head (2) by thread, two middle guide sleeves are sleeved on the anode rod, and the connection between the middle guide sleeve and the anode rod (3) is wrapped and positioned by PVC insulating tape to prevent the middle guide sleeve from moving along the anode rod (3); one end of the anode cable (1) is fixed in the collector head (2) by soldering, the anode rod (3) is connected to the anode cable (1) through the collector head (2), and the anode rod (3) and the collector head (2) are connected by thread to conduct the current in the anode cable (1); the positioning cone sleeve (5) is fixed to the bottom of the anode rod (3) by thread connection.

2. The anode device for chromium plating of the inner hole of a large aspect ratio reducer pipe according to claim 1, characterized in that: Both ends of the anode rod are threaded.

3. The anode device for chromium plating of the inner hole of a large aspect ratio reducer pipe according to claim 1, characterized in that: The outer guide sleeve and the middle guide sleeve are used to position the anode rod.

4. The anode device for chromium plating of the inner hole of a large aspect ratio reducer pipe according to claim 1, characterized in that: The outer diameters of the side guide sleeve and the middle guide sleeve match the inner diameter of the straight bore portion of the inner hole of the plated component, and the end faces are petal-shaped.

5. The anode device for chromium plating of the inner hole of a large aspect ratio reducer pipe according to claim 1, characterized in that: The end face of the positioning cone sleeve is petal-shaped.

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