Electrophoretic hanger for steel pipes
By designing an electrophoresis hanger that is compatible with multiple specifications, and using a conical pin and a spring probe to achieve uniform distribution of electrophoretic liquid inside and outside the steel pipe fittings, the problem of thin coating or exposed substrate in the inner hole is solved, the protective performance of the parts is improved and the equipment cost is reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG HONGWEI TECH CO LTD
- Filing Date
- 2025-09-09
- Publication Date
- 2026-08-04
AI Technical Summary
During the electrophoresis process, uneven electric field distribution in steel pipe fittings can lead to excessively thin coatings or exposed substrates in the inner bore. Furthermore, existing lifting tools are difficult to adapt to workpieces of different diameters and lengths, increasing equipment costs.
An electrophoresis hanger comprising a main frame and a mounting bracket was designed. A conical pin and a spring probe are used to ensure uniform distribution of the electrophoretic solution. The combination structure of movable and fixed brackets can adapt to steel pipes of different specifications to achieve uniform coating inside and outside.
It solves the problem of excessively thin coating on the inner hole or exposed substrate, ensuring the overall protective performance of the parts, while reducing equipment costs and the risk of wire wear, and adapting to the installation requirements of workpieces of different specifications.
Smart Images
Figure CN224591058U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electrophoretic coating technology, and in particular to an electrophoretic lifting device for steel pipe fittings. Background Technology
[0002] During the electrophoresis process, steel pipe fittings (such as automotive drive shafts, hydraulic oil pipes, and piston rods in construction machinery) often suffer from uneven electric field distribution between their interior and exterior surfaces. This can lead to a situation where the coating thickness on the outer surface meets the standard, but the coating on the inner holes is too thin, or even exposes the substrate, affecting the overall protective performance of the parts. Moreover, existing electrophoresis lifting fixtures for steel pipe fittings are mostly of fixed specifications, making it difficult to adapt to workpieces of different diameters and lengths, thus increasing equipment costs. Utility Model Content
[0003] To address the aforementioned issues, this invention provides an electrophoretic lifting device for steel pipe fittings, which can be adapted to various specifications of steel pipe fittings, ensuring that a uniform electrophoretic coating can be formed on both the inner and outer surfaces of the parts.
[0004] Therefore, the technical solution of this utility model is: an electrophoresis hanger for steel pipe fittings, including a main frame and a mounting frame. The main frame includes a top crossbeam and two side support rods, and a hanging ring is provided on the top crossbeam. The mounting frame includes a fixed bracket and a movable bracket. The fixed bracket is in the shape of an inverted mountain and has a vertical guide rail in the middle. The movable bracket has a vertical movable strip in the middle, and the upper end of the movable strip is slidably installed in the guide rail and locked by bolts. Both the fixed bracket and the movable bracket are provided with positioning seats, and a conical pin is fixed on the positioning seat. The conical pin has several axial guide grooves. The two sides of the fixed bracket are rotatably mounted on the support rods through a rotating shaft. A float is fixed at the bottom of the movable bracket, and the float drives the mounting frame to rotate around the rotating shaft.
[0005] Based on the above scheme and as a preferred embodiment of the above scheme: the fixed bracket is provided with an upper positioning seat, and a first conical pin is fixed on the upper positioning seat. The first conical pin is made of brass. A spring probe is provided inside the upper positioning seat. One end of the spring probe is connected to a wire, and the other end is electrically connected to the first conical pin.
[0006] Based on the above scheme and as a preferred embodiment of the above scheme: the upper positioning seat is provided with a mounting groove, and the mounting groove is provided with an internal thread; the top of the upper positioning seat is provided with a probe mounting hole, and the tail of the spring probe extends into the mounting groove; the tail of the first conical pin is provided with a protruding first mounting post, and the first mounting post is provided with an external thread structure, which works in conjunction with the mounting groove; the top of the first mounting post abuts against the tail of the spring probe.
[0007] Based on the above scheme and as a preferred embodiment of the above scheme: the left rotating shaft of the fixed bracket is a hollow structure, and the inner wall of the left side of the fixed bracket is provided with a first threading hole and a first threading groove, the first threading hole being connected to the interior of the hollow rotating shaft; the top of the fixed bracket is provided with a second threading hole and a second threading groove, the second threading hole being opposite to the first threading groove.
[0008] Based on the above scheme and as a preferred embodiment of the above scheme: the movable strip is provided with a through hole, the guide rail is provided with a long slot, and the bolt passes through the through hole and locks into the long slot.
[0009] Compared with the prior art, the beneficial effects of this utility model are: 1. The steel pipe fitting is fixed by the conical pins on the upper and lower positioning seats, and the electrophoretic liquid enters the steel pipe fitting through the axial guide groove on the conical pin. This optimizes the electric field distribution inside and outside the steel pipe fitting during the electrophoresis process, effectively solving the problem of the inner hole coating being too thin or exposed when the outer surface coating meets the standard, and ensuring the overall protective performance of the parts.
[0010] 2. The mounting bracket is configured as a separate fixed bracket and a movable bracket. The movable bracket's movable bar can slide along the guide rail of the fixed bracket and be locked in place by bolts. The through holes on the movable bar cooperate with the long slots in the guide rail, which facilitates quick locking and loosening of the bolts, enabling flexible adjustment of the movable bracket's position. The installation position can be adjusted according to steel pipes of different diameters and lengths, eliminating the need to equip different specifications of workpieces with separate lifting tools, thus reducing equipment costs.
[0011] 3. A spring probe is installed inside the positioning seat on the fixed bracket. The spring probe is electrically connected to the conical pin made of brass, which can ensure that the current is stably conducted to the workpiece during the electrophoresis process and avoid the coating quality being affected by poor conductivity. The hollow rotating shaft on the left side of the fixed bracket, the first wire hole and the first wire groove on the inner wall, and the second wire hole and the second wire groove on the top can organize the connecting wires in an orderly manner, so as to avoid the wires being messy and affecting the electrophoresis process, and also reduce the risk of wire wear. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 A magnified view of a portion of the image; Figure 3 This is a cross-sectional view of the structure of the first conical ejector pin of this utility model; Figure 4 This is a diagram showing the usage state of this utility model; Figure 5 for Figure 4 A magnified view of a portion of the image; Figure 6This is a schematic diagram of the structure of this utility model (length adjusted and the specifications of the conical ejector pin changed); Figure 7 This is a diagram showing the usage state of this utility model (length adjustment and replacement of the conical ejector pin specification).
[0013] The components are marked as follows: main frame 1, top crossbeam 11, side support rods 12, fixed bracket 2, guide rail 21, long slot 22, first wire hole 23, first wire groove 24, second wire hole 25, second wire groove 26, movable bracket 3, base plate 31, movable strip 32, rotating shaft 4, bolt 5, float ball 6, upper positioning seat 7, mounting groove 71, probe mounting hole 72, spring probe 73, first conical ejector pin 8, first mounting column 81, guide groove 82, lower positioning seat 9, second conical ejector pin 10, steel pipe fitting 20. Detailed Implementation
[0014] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.
[0015] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.
[0016] See the attached drawings. The steel pipe electrophoresis hanger described in this embodiment includes a main frame 1 and a mounting frame. The main frame 1 includes a top crossbeam 11 and two side support rods 12. The top crossbeam 11 is provided with a hanging ring 13, which can be hung on a moving track and driven into the electrophoresis tank by the moving track.
[0017] The mounting bracket includes a fixed bracket 2 and a movable bracket 3. The fixed bracket 2 is in the shape of an inverted mountain and has a vertical guide rail 21 in the middle. The guide rail 21 has a vertically arranged elongated slot 22. The fixed bracket 2 is rotatably mounted on the support rod 12 on both sides through a rotating shaft 4, so that the fixed bracket 2 can rotate around the main frame 1 through the rotating shaft 4.
[0018] The movable support 3 includes a base plate 31 with a vertical movable strip 32 in the middle. The upper end of the movable strip 32 is slidably mounted in a guide rail 21. The movable strip 32 has a through hole, through which a bolt 5 passes and locks into a long slot 22. The through hole on the movable strip 32 and the long slot 22 in the guide rail 21 facilitate quick locking and loosening of the bolt 5, enabling flexible adjustment of the position of the movable support 3. The installation position can be adjusted according to steel pipes of different diameters and lengths, eliminating the need for separate lifting devices for different specifications of workpieces and reducing equipment costs. A float 6 is fixed at the bottom of the movable support 3. When immersed in the electrophoresis tank, the float 6 is buoyed and can drive the mounting frame to rotate around the main frame 1.
[0019] The fixed bracket 2 has symmetrical upper positioning seats 7 on both sides, and a first conical pin 8 is fixed on the upper positioning seat 7. The first conical pin 8 is made of brass. The upper positioning seat 7 has a mounting groove 71 with internal threads. The top of the upper positioning seat 7 has a probe mounting hole 72, and the tail of the spring probe 73 extends into the mounting groove 71. The tail of the first conical pin 8 has a protruding first mounting post 81 with external threads, which works in conjunction with the mounting groove 71. The top of the first mounting post 81 abuts against the tail of the spring probe 73. One end of the spring probe 73 is connected to an electrical contact via a wire, and the other end is electrically connected to the first conical pin 8. A negative wire is provided on the moving track, and the electrical contact is electrically connected to the negative terminal, thus connecting the steel pipe to the negative terminal. At the same time, different specifications of the first conical pin 8 can be replaced according to the structure of the steel pipe (e.g., Figure 1 and Figure 6 (The first conical ejector pin of a different specification was replaced).
[0020] The left-side rotating shaft of the fixed bracket 2 has a hollow structure. The inner wall of the left side of the fixed bracket 2 has a first threading hole 23 and a first threading groove 24, with the first threading hole 24 communicating with the interior of the hollow rotating shaft. The top of the fixed bracket 2 has a second threading hole 25 and a second threading groove 26, with the second threading hole 25 positioned opposite to the first threading groove 24. The wires on the spring probe 73 pass through the various threading grooves and holes to prevent interference with the electrophoresis process.
[0021] The base plate 31 of the movable bracket 3 is provided with lower positioning seats 9 on both sides. The second conical ejector pin 10 is fixed on the lower positioning seat 9. The second conical ejector pin can be made of insulating material. Similarly, the lower positioning seat is also provided with a mounting groove. The second conical ejector pin is fixed in the mounting groove by a threaded mounting post. The appropriate size of the second conical ejector pin can be replaced according to the diameter of the steel pipe.
[0022] Both the first conical ejector pin 8 and the second conical ejector pin 10 are provided with 3 to 4 axial flow guide grooves 82. The flow guide grooves 82 extend from the tip to the root that connects with the positioning seat, and the edges of the grooves are rounded. The flow guide groove design on the conical ejector pins ensures that the electrophoretic liquid can smoothly enter the interior of the tubular part. Combined with the tiltable design of the workpiece, it promotes the flow of electrolyte in the tube and the discharge of air bubbles, so that a uniform coating can be formed on both the inner hole and the outer surface.
[0023] After the conical ejector pin is inserted into the inner hole of the steel tube, its axial flow channel guides the electrophoretic liquid to flow orderly inside the part, breaking the uneven distribution of the electric field inside and outside the part in traditional electrophoresis, so that a uniform coating can be formed on both the inner hole and the outer surface at the same time. The conical ejector pin, made of brass, has good conductivity. The spring probe is in close contact with the ejector pin through elastic compression. At the same time, the probe is connected to the negative electrode line, forming a stable current path of "negative electrode line - spring probe - conical ejector pin - steel tube", which meets the conductivity requirements of electrophoresis.
[0024] During work: 1. According to the specifications of the steel pipe fitting 20 to be electrophoresed, loosen the bolts 5 on the movable bracket 3, push the movable bar 32 to slide along the guide rail 21, adjust the distance between the conical ejector pins on the fixed bracket 2 and the movable bracket 3 so that the distance between the two ejector pins matches the length of the part and the diameter of the ejector pins matches the inner hole size of the part.
[0025] 2. Place both ends of the steel pipe fitting 20 onto the conical pins of the fixed bracket 2 and the movable bracket 3 respectively, ensuring that the pins are fully inserted into the inner hole. Then tighten the bolts 5 to lock the movable strip 32 onto the guide rail 21, so that the parts are stably fixed on the lifting device.
[0026] 3. Check the contact state between the spring probe 73 and the first conical pin 8 to ensure that the spring probe 73 is in close contact with the first conical pin 8 due to its elasticity. At the same time, confirm that the electrical contact at the other end of the spring probe is firmly connected to the negative wire to form a complete conductive path.
[0027] 4. The lifting device and steel pipe 20 are suspended together in the electrophoresis tank through the hanging ring 13 of the top crossbeam of the main frame 1. After the power is turned on, the current is conducted to the part through the negative electrode line, spring probe and conical pin. The electrophoretic liquid forms a uniform electric field inside and outside the part (including the inner hole area guided by the guide groove) and the coating deposition begins.
[0028] 5. After electrophoresis is completed, disconnect the power supply and remove the lifting device from the electrophoresis tank. Loosen the bolts and remove the parts. If you need to replace parts of different specifications, repeat steps 1-4.
[0029] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.
Claims
1. A kind of electrophoretic hanger for steel pipe fittings, comprising main frame and mounting rack, the main frame includes top beam and two side support rods, and hanging ring is arranged on the top beam;Characterized in that: The mounting bracket includes a fixed bracket and a movable bracket. The fixed bracket is in the shape of an inverted mountain and has a vertical guide rail in the middle. The movable bracket has a vertical movable strip in the middle, the upper end of which is slidably installed in the guide rail and locked with bolts. Both the fixed bracket and the movable bracket are provided with positioning seats, and a conical pin is fixed on the positioning seat. The conical pin has several axial guide grooves. The two sides of the fixed bracket are rotatably mounted on the support rod via a rotating shaft. A float is fixed at the bottom of the movable bracket, and the float drives the mounting bracket to rotate around the rotating shaft.
2. The electrophoretic spreader hanger for steel pipe sections as claimed in claim 1, characterized in that: The fixed bracket is provided with an upper positioning seat, on which a first conical pin is fixed. The first conical pin is made of brass. A spring probe is provided inside the upper positioning seat. One end of the spring probe is connected to a wire, and the other end is electrically connected to the first conical pin.
3. An electrophoretic spreader hanger for steel pipe sections as claimed in claim 2, characterized in that: The upper positioning seat is provided with a mounting groove, and the inside of the mounting groove is provided with an internal thread; the top of the upper positioning seat is provided with a probe mounting hole, and the tail of the spring probe extends into the mounting groove.
4. The electrophoretic spreader hanger for steel pipe sections as claimed in claim 3, characterized in that: The first conical ejector pin has a protruding first mounting post at its tail end, and the first mounting post has an external thread structure that works in conjunction with the mounting groove; the top of the first mounting post abuts against the tail end of the spring probe.
5. The electrophoretic spreader hanger for steel pipe sections as defined in claim 1, wherein: The left rotating shaft of the fixed bracket is a hollow structure. The inner wall of the left side of the fixed bracket is provided with a first wire hole and a first wire groove. The first wire hole is connected to the inside of the hollow rotating shaft. The top of the fixed bracket is provided with a second wire hole and a second wire groove. The second wire hole and the first wire groove are opposite to each other.
6. An electrophoresis hanger for steel pipes as set forth in claim 1, wherein: The movable strip has a through hole, and the guide rail has a long slot. The bolt passes through the through hole and locks into the long slot.