Electrolytic polishing method for stainless steel pipe

Abstract

The present application relates to the technical field of stainless steel pipe polishing processing, in particular to a pipe electrolytic polishing processing method for stainless steel pipe, which adopts an alkali immersion cleaning device, comprising a fixing base and a cleaning mechanism, in the cleaning mechanism, the scraper one and the scraper two can cooperate to wipe and scrape the aluminum hydroxide thin layer attached to the inner and outer walls of the stainless steel pipe, ensure the surface of the stainless steel pipe to fully contact with the air, so as to accelerate the subsequent nitric acid passivation reaction rate, avoid the time consumed by the reaction of nitric acid and aluminum hydroxide thin layer; the spray pipe one and the spray pipe two can cooperate to clean the inner and outer walls of the stainless steel pipe after wiping and scraping at the same time, reduce the time consumed by separate cleaning of the inner and outer walls of the stainless steel pipe, improve the cleaning efficiency of the stainless steel pipe after alkali immersion, and further shorten the electrolytic polishing time of the stainless steel pipe.

Description

Technical Field

[0001] This invention relates to the technical field of stainless steel pipe polishing, specifically to a method for electrolytic polishing of stainless steel pipes. Background Technology

[0002] Stainless steel pipe is a hollow, long, round steel material. Among metal pipes with the same bending and torsional strength, it is lighter in weight and is widely used in industrial pipelines for petroleum, chemical, and medical applications, as well as in mechanical structural components. To ensure the surface gloss of stainless steel pipes during use, they are often polished before use. Common polishing methods can be divided into mechanical polishing and electrolytic polishing. Electrolytic polishing includes degreasing, electrolytic polishing, alkali immersion, acid passivation, and cleaning. Compared with mechanical polishing, electrolytic polishing has the advantages of a smoother and brighter surface, no surface alteration layer, and no additional stress.

[0003] The existing electropolishing process for stainless steel pipes has the following defects: 1. After electropolishing, the stainless steel pipe is immersed in alkali to neutralize the surface with dilute sulfuric acid. At this time, in order to completely neutralize the dilute sulfuric acid on the surface of the stainless steel pipe, an excess of sodium carbonate is used during the alkali immersion process. Since the neutralization reaction is exothermic, the excess sodium carbonate reacts with the stainless steel pipe to form a thin layer of aluminum hydroxide. The thin layer isolates the stainless steel pipe from the outside world, thus affecting the rate of the subsequent passivation reaction.

[0004] The alkali immersion process requires cleaning the surface of stainless steel pipes. However, the existing cleaning steps after alkali immersion cannot clean the inner and outer walls of the stainless steel pipes simultaneously, which affects the cleaning efficiency after alkali immersion and thus the electrolytic polishing efficiency of the stainless steel pipes. Summary of the Invention

[0005] The purpose of this invention is to provide a method for electrolytic polishing of stainless steel pipes. Scraper 1 and scraper 2 work together to scrape off the thin layer of aluminum hydroxide adhering to the inner and outer walls of the stainless steel pipe. Spray pipe 1 and spray pipe 2 work together to clean the inner and outer walls of the stainless steel pipe simultaneously, resulting in better cleaning effect and higher cleaning efficiency for the stainless steel pipe.

[0006] The present invention is achieved by the following technical solution: an electrolytic polishing method for stainless steel pipes. The method employs an alkali immersion cleaning device, which includes a fixed base, and a cleaning mechanism is installed on the upper surface of the fixed base.

[0007] The cleaning mechanism includes a vertical frame, which is installed on the right side of the upper end face of the fixed base. A supporting cylinder is provided on the left end face of the vertical frame. Symmetrical baffles are installed on the right side of the circumference of the supporting cylinder. An adjustment part is provided on the supporting cylinder. A spray pipe for cleaning the inner wall of the stainless steel pipe is installed at the upper end of the adjustment part. A scraper for cleaning the inner wall of the stainless steel pipe is installed at the lower end of the adjustment part. Symmetrical support rods for supporting the stainless steel pipe are installed on the upper end face of the fixed base.

[0008] The fixed base has symmetrical support spring rods installed on its upper surface and between the support rods. A cleaning plate is installed on the upper end of the support spring rods. The cleaning plate is equipped with a scraper and a spray pipe for cleaning and washing the outer wall of the stainless steel pipe.

[0009] The above-mentioned alkali immersion cleaning device is used to clean stainless steel pipes, including the following steps: Step 1, workpiece degreasing: use degreasing agent or acetone and a scouring pad to remove heavy oil stains from the surface of stainless steel pipes.

[0010] The second step is water washing and acid immersion: the stainless steel pipe is cleaned with pure water using a high-pressure water gun, and then the cleaned stainless steel pipe is immersed in dilute sulfuric acid.

[0011] Step 3, electrolytic polishing: Place the acid-impregnated stainless steel tube at the anode and pass electricity through the electrolyte. Under appropriate operating parameters, an electrolytic reaction occurs, thereby dissolving and polishing the surface of the stainless steel tube.

[0012] Step 4, Alkali Immersion Cleaning: Immerse the stainless steel pipe obtained in Step 3 in sodium carbonate solution. After a period of time, remove the stainless steel pipe, pass it through the support cylinder, and place it on the support rod. Rotate the stainless steel pipe and use scraper one and spray pipe one in conjunction with scraper two and spray pipe two to clean the inside and outside of the alkali-immersed stainless steel pipe simultaneously.

[0013] Step 5, acid immersion cleaning: Place the stainless steel pipe obtained in step 4 into a dilute nitric acid solution for passivation reaction. After a period of time, remove the stainless steel pipe and clean it with a high-pressure water gun.

[0014] Step 6: Drying and Packaging: Wipe and dry the stainless steel tubes obtained in Step 5, and finally package the stainless steel tubes.

[0015] Optionally, the left end face of the vertical frame is provided with a sliding groove, and a movable block fixedly connected to the supporting cylinder is slidably arranged inside the sliding groove. A connecting groove is provided inside the movable block, and a bidirectional cylinder is installed inside the connecting groove. A locking block symmetrically arranged front and rear is slidably arranged inside the connecting groove. The locking block is fixedly connected to the telescopic end of the bidirectional cylinder on the same side. A serrated protrusion is installed on the side of the locking block away from the telescopic end of the bidirectional cylinder. Rubber strips that cooperate with the locking blocks on the same side are installed on the front and rear sides of the sliding groove.

[0016] Optionally, the adjustment unit includes a linkage plate fixed to the lower end of the moving block. The supporting cylinder has an adjustment groove that runs vertically through it. Multiple adjustment plates are arranged inside the adjustment groove from left to right. The adjustment plates are mounted on the supporting cylinder via spring hinges. A traction rope is installed on the lower side of the adjustment plates. The right end of the traction rope is fixedly connected to the linkage plate. A placement plate is installed on the upper end of the adjustment plates via hinges. A spray pipe is installed on the placement plate. A scraper is installed on the lower end of the adjustment plates via hinges.

[0017] Optionally, the left and right ends of the support rod are equipped with movable rods via bearings, and the movable rods are slidably disposed on the upper surface of the fixed base. A linkage rod is installed between the movable rods on the same support rod. A two-way cylinder is installed on the upper surface of the fixed base and between the linkage rods via a motor mount. The two telescopic ends of the two-way cylinder are fixedly connected to the two linkage rods at the front and rear, respectively.

[0018] Optionally, the cleaning plate has a U-shaped structure. A scraper is installed in the middle of the upper surface of the horizontal section of the cleaning plate. The two vertical sections of the cleaning plate are inclined towards the scraper, and spray pipes are installed on the upper surfaces of both vertical sections. The scraper is slightly higher than the two vertical sections of the cleaning plate to ensure that the spray pipes do not come into contact with the stainless steel pipe when the scraper comes into contact with it, thus ensuring the cleaning effect of the spray pipes. The inclined arrangement of the two vertical sections of the cleaning plate ensures that the wastewater generated during the cleaning of the stainless steel pipe by the spray pipes enters the interior of the cleaning plate, preventing wastewater from splashing onto the fixed base and affecting environmental hygiene.

[0019] Optionally, a support frame is detachably installed on the left side of the upper end face of the fixed base, and a connecting block is installed on the right end face of the support frame to support the support cylinder and engage with the support cylinder. The support frame and the connecting block cooperate with each other to ensure the stability of the support cylinder during the cleaning process. There are multiple support frames, and the support frames are of different heights, so the support frames of different heights can adapt to the changes in the height of the support cylinder.

[0020] Optionally, an inclined block is installed on the lower end face of the fixed base, wherein the height of the vertical section on the right side of the inclined block is less than the vertical height on the left side of the inclined block, so that the fixed base can tilt downward from left to right, thereby ensuring that the wastewater in the cleaning process is discharged smoothly from left to right, and avoiding solid impurities in the waste liquid from adhering to the inner wall of the stainless steel pipe when it is in a horizontal position.

[0021] Optionally, a guide frame is installed through the lower side of the vertical frame, which is inclined downward from left to right and matches the right end of the cleaning plate. The wastewater generated from cleaning the inner wall of the stainless steel pipe and the wastewater generated from cleaning the outer wall of the stainless steel pipe fall evenly onto the guide frame. The guide frame can guide and discharge the wastewater from cleaning the inner and outer walls of the stainless steel pipe in a unified manner.

[0022] Optionally, multiple ball bearings are evenly arranged on the left end face of the baffle to reduce friction between the stainless steel tube and the baffle during rotation and to avoid wear on the right end face of the stainless steel tube.

[0023] Compared with the prior art, the above-mentioned electrolytic polishing method for stainless steel pipes has the following advantages: 1. In the cleaning mechanism designed in this invention, scraper one and scraper two work together to wipe and remove the thin layer of aluminum hydroxide adhering to the inner and outer walls of the stainless steel pipe, ensuring that the surface of the stainless steel pipe is in full contact with the air, thereby accelerating the subsequent nitric acid passivation reaction rate and avoiding the time consumed by the reaction between nitric acid and the thin layer of aluminum hydroxide.

[0024] 2. The spray pipe one and spray pipe two designed in this invention can work together to clean the inner and outer walls of the stainless steel pipe at the same time after wiping and scraping, reducing the time consumed by cleaning the inner and outer walls of the stainless steel pipe separately, improving the cleaning efficiency of the stainless steel pipe after alkali immersion, and further shortening the electrolytic polishing time of the stainless steel pipe.

[0025] 3. The movable block designed in this invention moves up and down, thereby changing the center height of the supporting cylinder. The vertically movable supporting cylinder, the forward and backward movable support rod, and the spray pipe one and spray pipe two work together to clean stainless steel pipes of different diameters, making it more versatile.

[0026] 4. The tilting block designed in this invention allows the stainless steel pipe to be tilted downwards from left to right during cleaning, which facilitates the smooth discharge of wastewater from the inside of the stainless steel pipe after cleaning. Attached Figure Description

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Figure 1 This is a flowchart of the electrolytic polishing process for stainless steel pipes provided in an embodiment of the present invention.

[0030] Figure 2 This is a three-dimensional installation structure diagram of the alkali immersion cleaning device and the stainless steel pipe provided in the embodiment of the present invention.

[0031] Figure 3 This is a front view of the installation structure between the fixed base and the inclined block provided in an embodiment of the present invention.

[0032] Figure 4 This is a front view of the alkali immersion cleaning device provided in this embodiment of the invention after removing the inclined block and rotating it by a certain angle.

[0033] Figure 5 This is a schematic diagram of the installation structure between the interior of the vertical frame and the moving block provided in an embodiment of the present invention (viewed from left to right).

[0034] Figure 6 This is a three-dimensional structural schematic diagram of the alkali soaking and cleaning device provided in an embodiment of the present invention.

[0035] Figure 7 This is part of the embodiments provided by the present invention. Figure 6 A schematic diagram of the three-dimensional structure.

[0036] Figure 8 This is part of the embodiments provided by the present invention. Figure 7 A schematic diagram of the three-dimensional structure.

[0037] Figure 9 This is a schematic diagram of the three-dimensional installation structure between the baffle and the ball provided in an embodiment of the present invention.

[0038] Figure 10 This is part of the embodiments provided by the present invention. Figure 6 A schematic diagram of the three-dimensional structure.

[0039] Figure 11 This is a schematic diagram of the three-dimensional installation structure between the support spring rod and the cleaning plate provided in an embodiment of the present invention.

[0040] Figure 12 This is provided by the embodiments of the present invention. Figure 11 A magnified view of a portion of the image.

[0041] Icons: 1. Fixed base; 11. Support spring rod; 12. Cleaning plate; 13. Scraper II; 14. Spray pipe II; 15. Support frame; 16. Connecting block; 17. Inclined block; 18. Guide frame; 2. Cleaning mechanism; 21. Vertical frame; 211. Slide groove; 212. Moving block; 213. Connecting groove; 214. Double-acting cylinder I; 215. Locking block; 216. Serrated protrusion; 217. Rubber strip; 22. Support cylinder; 23. Baffle; 231. Ball bearing; 24. Adjustment part; 241. Linkage plate; 242. Adjustment plate; 243. Traction rope; 244. Placement plate; 25. Spray pipe I; 26. Scraper I; 27. Support rod; 271. Moving rod; 272. Linkage rod; 273. Double-acting cylinder II; 3. Stainless steel pipe. Implementation

[0042] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] See Figure 2 as well as Figure 6 An electrolytic polishing method for stainless steel pipes is disclosed. This method employs an alkali immersion cleaning device, which includes a fixed base 1, and a cleaning mechanism 2 is mounted on the upper surface of the fixed base 1.

[0044] See Figure 4 as well as Figure 7 The cleaning mechanism 2 includes a vertical frame 21, which is installed on the right side of the upper end face of the fixed base 1. A supporting cylinder 22 is provided on the left end face of the vertical frame 21. A front-to-back symmetrical baffle 23 is installed on the right side of the circumference of the supporting cylinder 22. An adjustment part 24 is provided on the supporting cylinder 22. A spray pipe 25 for cleaning the inner wall of the stainless steel pipe 3 is installed at the upper end of the adjustment part 24. A scraper 26 for cleaning the inner wall of the stainless steel pipe 3 is installed at the lower end of the adjustment part 24. A support rod 27 for supporting the stainless steel pipe 3 is installed on the upper end face of the fixed base 1.

[0045] See Figure 5The vertical frame 21 has a sliding groove 211 on its left end face. A movable block 212, which is fixedly connected to the supporting cylinder 22, is slidably arranged inside the sliding groove 211. A connecting groove 213, which runs through the front and rear, is opened inside the moving block 212. A bidirectional cylinder 214 is installed inside the connecting groove 213. A locking block 215, which is symmetrically arranged in front and rear, is slidably arranged inside the connecting groove 213. The locking blocks 215 are fixedly connected to the telescopic ends of the bidirectional cylinder 214 on the same side. A serrated protrusion 216 is installed on the side of the locking block 215 away from the telescopic end of the bidirectional cylinder 214. Rubber strips 217 that cooperate with the locking blocks 215 on the same side are installed on the front and rear sides of the sliding groove 211.

[0046] See Figure 4 as well as Figure 8 The adjustment part 24 includes a linkage plate 241 fixed to the lower end of the moving block 212. The supporting cylinder 22 has an adjustment groove that runs vertically through it. Multiple adjustment plates 242 are arranged inside the adjustment groove from left to right. The adjustment plates 242 are mounted on the supporting cylinder 22 by spring hinges. A traction rope 243 is installed on the lower side of the adjustment plates 242. The right end of the traction rope 243 is fixedly connected to the linkage plate 241. A placement plate 244 is installed on the upper end of the adjustment plates 242 by hinges. A spray pipe 25 is installed on the placement plate 244. A scraper 26 is installed on the lower end of the adjustment plates 242 by hinges.

[0047] See Figure 6 , Figure 11 as well as Figure 12 The fixed base 1 has symmetrical support spring rods 11 installed on its upper surface and between the support rods 27. The upper ends of the support spring rods 11 are all equipped with cleaning plates 12. The cleaning plates 12 are respectively equipped with scraper 13 and spray pipe 14 for cleaning and washing the outer wall of the stainless steel pipe 3.

[0048] The adjusting plate 242 is inclined upwards from left to right. In operation, the stainless steel pipe 3 passes through the supporting cylinder 22 from left to right, placing it on the support rod 27. The right end of the stainless steel pipe 3 abuts against the baffle 23, and the lower side wall of the stainless steel pipe 3 abuts against the scraper 13. The supporting spring rod 11 and the cleaning plate 12 cooperate to ensure that the scraper 13 always abuts against the stainless steel pipe 3. External force (manual winding or existing winding motor winding) drives the traction rope 243 to move to the right. At this time, the traction rope 243 drives the adjusting plate 242 to rotate counterclockwise. 2. The length of the lower part of the spring hinge shaft is greater than the length of the upper part of the adjusting plate 242. During the rotation of the adjusting plate 242, the scraper 26 abuts against the inner wall of the stainless steel pipe 3. At this time, the placement plate 244 moves the spray pipe 25 to the vicinity of the inner wall of the stainless steel pipe 3. The greater length of the lower part of the adjusting plate 242 at the spring hinge shaft than the upper part of the adjusting plate 242 at the spring hinge shaft can ensure that when the scraper 26 abuts against the inner wall of the stainless steel pipe 3 during the rotation of the adjusting plate 242, the spray pipe 25 does not contact the inner wall of the stainless steel pipe 3, thus ensuring the spraying effect of the spray pipe 25.

[0049] After the stainless steel tube 3 is placed, it is rotated by external force (manually applied driving force, etc.). During the rotation of the stainless steel tube 3, scraper 1 26 and scraper 2 13 work together to scrape off the thin layer of aluminum hydroxide adhering to the inner and outer walls of the stainless steel tube 3, ensuring that the surface of the stainless steel tube 3 is in full contact with the air, thereby accelerating the subsequent nitric acid passivation reaction rate and avoiding the time consumed by the reaction between nitric acid and the thin layer of aluminum hydroxide.

[0050] After the aluminum hydroxide thin layer on the surface of the stainless steel pipe 3 is scraped off, high-pressure water is pumped into the spray pipe 25 and the spray pipe 14. Then, the spray pipe 25 and the spray pipe 14 work together to clean the inside and outside of the stainless steel pipe 3 with high-pressure water. After the stainless steel pipe 3 is cleaned, it is removed from the support column 22.

[0051] See Figure 12 The cleaning plate 12 has a U-shaped structure. A scraper 13 is installed in the middle of the upper surface of the horizontal section of the cleaning plate 12. The two vertical sections of the cleaning plate 12 are inclined towards the scraper 13, and spray pipes 14 are installed on the upper surface of the two vertical sections of the cleaning plate 12. The scraper 13 is slightly higher than the two vertical sections of the cleaning plate 12 to ensure that the spray pipes 14 do not come into contact with the stainless steel pipe 3 when the scraper 13 comes into contact with the stainless steel pipe 3, thus ensuring the cleaning effect of the spray pipes 14. The inclined arrangement of the two vertical sections of the cleaning plate 12 can ensure that the wastewater generated by the spray pipes 14 during the cleaning of the stainless steel pipe 3 enters the interior of the cleaning plate 12, avoiding the wastewater from splashing onto the fixed base 1 and affecting environmental hygiene.

[0052] See Figure 4 The fixed base 1 has a support frame 15 detachably installed on the left side of its upper end face. The support frame 15 has a connecting block 16 installed on its right end face to support the support cylinder 22 and to engage with the support cylinder 22. The support frame 15 and the connecting block 16 cooperate with each other to ensure the stability of the support cylinder 22 during the cleaning process. There are multiple support frames 15, and the support frames 15 are of different heights. Therefore, the support frames 15 of different heights can adapt to the changes in the height of the support cylinder 22.

[0053] See Figure 4 The vertical frame 21 is equipped with a guide frame 18 that is inclined downward from left to right and matches the right end of the cleaning plate 12. The wastewater generated from cleaning the inner wall of the stainless steel pipe 3 and the wastewater generated from cleaning the outer wall of the stainless steel pipe 3 fall evenly onto the guide frame 18. The guide frame 18 can guide and discharge the wastewater from cleaning the inner and outer walls of the stainless steel pipe 3 in a unified manner.

[0054] See Figure 9 The left end face of the baffle 23 is evenly provided with a plurality of ball bearings 231 to reduce the friction between the stainless steel tube 3 and the baffle 23 during rotation and to avoid wear on the right end face of the stainless steel tube 3.

[0055] See Figure 6 as well as Figure 10 The supporting rod 27 has movable rods 271 installed at its left and right ends via bearings, and the movable rods 271 are slidably mounted on the upper surface of the fixed base 1. Linkage rods 272 are installed between the movable rods 271 on the same supporting rod 27. A two-way cylinder 273 is installed on the upper surface of the fixed base 1 and between the linkage rods 272 via a motor mount. The two telescopic ends of the two-way cylinder 273 are fixedly connected to the two linkage rods 272 respectively.

[0056] To further improve the applicability of the cleaning mechanism 2, when cleaning stainless steel pipes 3 of different diameters after alkali immersion, the position of the vertically adjustable moving block 212 is used to move the supporting cylinder 22, thus changing the center position of the supporting cylinder 22 and consequently the distance between the supporting cylinder 22 and the fixed base 1. When the moving block 212 moves to the designated position, the bidirectional cylinder 214 is activated to move the locking block 215 forward and backward, causing the locking block 215 to contact the rubber strip 217. At this time, the serrated protrusion 216 is engaged inside the rubber strip 217, thereby making the serrated protrusion 216 engage with the rubber strip 217. The protrusion 216 and the rubber pad cooperate to fix the locking block 215 on the vertical frame 21. The moving block 212 and the locking block 215 also cooperate to fix it on the vertical frame 21. At the same time, the two-way cylinder 273 is activated to drive the linkage rod 272 to move. During the movement of the linkage rod 272, the moving rod 271 drives the support rod 27 to move. Thus, the vertically moving support cylinder 22, the forward and backward moving support rod 27, and the spray pipe 1 25 and spray pipe 2 14 cooperate to clean stainless steel pipes 3 of different diameters, making it more versatile.

[0057] See Figure 3 An inclined block 17 is installed on the lower end face of the fixed base 1. The height of the vertical section on the right side of the inclined block 17 is less than the vertical height on the left side of the inclined block 17. Therefore, the fixed base 1 can be tilted downward from left to right, thereby ensuring that the wastewater in the cleaning process is discharged smoothly from left to right, and avoiding solid impurities in the waste liquid from adhering to the inner wall of the stainless steel pipe 3 when it is in a horizontal position.

[0058] See Figure 1 The above-mentioned alkali immersion cleaning device also includes the following steps in the cleaning process of stainless steel pipes: Step 1: Degreasing the workpiece: Use a degreasing agent or acetone and a scouring pad to remove heavy oil stains from the surface of the stainless steel pipe 3.

[0059] Step 2, water washing and acid soaking: Use a high-pressure water gun to clean the stainless steel pipe 3 with pure water, and then soak the cleaned stainless steel pipe 3 in dilute sulfuric acid.

[0060] Step 3, electrolytic polishing: Place the acid-impregnated stainless steel tube 3 at the anode and pass electricity through the electrolyte. Under appropriate operating parameters, an electrolytic reaction occurs, thereby dissolving and polishing the surface of the stainless steel tube 3.

[0061] Step 4, Alkali Immersion Cleaning: Immerse the stainless steel pipe 3 obtained in Step 3 in sodium carbonate solution. After a period of time, remove the stainless steel pipe 3, pass it through the support cylinder 22, and place it on the support rod 27. Rotate the stainless steel pipe 3 and use scraper 1 26, spray pipe 1 25 and scraper 2 13, spray pipe 2 14 to clean the inner and outer sides of the alkali-immersed stainless steel pipe 3 simultaneously.

[0062] Step 5, acid immersion cleaning: Place the stainless steel tube 3 obtained in step 4 into a dilute nitric acid solution for passivation reaction. After a period of time, take out the stainless steel tube 3 and clean it with a high-pressure water gun.

[0063] Step 6, Drying and Packaging: Wipe and dry the stainless steel tube 3 obtained in step 5, and finally package the stainless steel tube 3.

[0064] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0065] Furthermore, the terms "first," "second," "number one," and "number two" 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 indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0067] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for electrolytic polishing of stainless steel pipes, the method employing an alkali immersion cleaning device, the alkali immersion cleaning device comprising a fixed base, characterized in that: A cleaning mechanism is installed on the upper surface of the fixed base; wherein: The cleaning mechanism includes a vertical frame, which is installed on the right side of the upper end face of the fixed base. A support column is provided on the left end face of the vertical frame. Symmetrical baffles are installed on the right side of the circumference of the support column. An adjustment part is provided on the support column. A spray pipe for cleaning the inner wall of the stainless steel pipe is installed at the upper end of the adjustment part. A scraper for cleaning the inner wall of the stainless steel pipe is installed at the lower end of the adjustment part. Symmetrical support rods for supporting the stainless steel pipe are installed on the upper end face of the fixed base. Symmetrical support spring rods are installed on the upper surface of the fixed base and between the support rods. A cleaning plate is installed on the upper end of the support spring rods. The cleaning plate is equipped with scraper 2 and spray pipe 2 for cleaning and washing the outer wall of the stainless steel pipe. An inclined block is installed on the lower end face of the fixed base, which causes the fixed base to tilt downwards from left to right. A sliding groove is provided on the left end face of the vertical frame. A movable block that is fixedly connected to the support cylinder is slidably arranged inside the sliding groove. The adjustment part includes a linkage plate fixed to the lower end of the movable block. An adjustment groove that runs vertically through the support cylinder is provided. Multiple adjustment plates are arranged from left to right inside the adjustment groove. The adjustment plates are mounted on the support cylinder through spring hinges. A traction rope is installed on the lower side of the adjustment plates. The right end of the traction rope is fixedly connected to the linkage plate. A placement plate is installed on the upper end of the adjustment plates through a hinge. A spray pipe is installed on the placement plate. A scraper is installed on the lower end of the adjustment plates through a hinge. The process of cleaning stainless steel pipes using the above-mentioned alkali immersion cleaning device includes the following steps: Step 1: Degreasing the workpiece: Use a degreasing agent or acetone and a scouring pad to remove heavy oil stains from the surface of the stainless steel pipe; Step 2, water washing and acid soaking: Use a high-pressure water gun to clean the stainless steel pipe with pure water, and then soak the cleaned stainless steel pipe in dilute sulfuric acid. Step 3, electrolytic polishing: Place the acid-impregnated stainless steel tube at the anode and pass an electric current through the electrolyte. Under appropriate operating parameters, an electrolytic reaction occurs, thereby dissolving and polishing the surface of the stainless steel tube. Step 4, Alkali Immersion Cleaning: Immerse the stainless steel pipe obtained in Step 3 in sodium carbonate solution. After a period of time, take out the stainless steel pipe, pass it through the support cylinder and place it on the support rod. Rotate the stainless steel pipe and use scraper one and spray pipe one in conjunction with scraper two and spray pipe two to clean the inside and outside of the alkali-immersed stainless steel pipe at the same time. Step 5, acid immersion cleaning: The stainless steel pipe obtained in step 4 is placed in a dilute nitric acid solution for passivation reaction. After a period of time, the stainless steel pipe is taken out and then cleaned with a high-pressure water gun. Step 6: Drying and Packaging: Wipe and dry the stainless steel tubes obtained in Step 5, and finally package the stainless steel tubes.

2. The method for electrolytic polishing of stainless steel pipes according to claim 1, characterized in that: The movable block has a through-slot connecting groove inside, and a bidirectional cylinder is installed inside the connecting groove. A locking block with symmetrical front and rear is slidably arranged inside the connecting groove. The locking block is fixedly connected to the telescopic end of the bidirectional cylinder on the same side. A serrated protrusion is installed on the side of the locking block away from the telescopic end of the bidirectional cylinder. Rubber strips that cooperate with the locking blocks on the same side are installed on the front and rear sides of the sliding groove.

3. The method for electrolytic polishing of stainless steel pipes according to claim 1, characterized in that: The left and right ends of the support rod are equipped with movable rods via bearings, and the movable rods are slidably mounted on the upper surface of the fixed base. The movable rods on the same support rod are connected by linkage rods. A two-way cylinder is mounted on the upper surface of the fixed base between the linkage rods via a motor mount. The front and rear telescopic ends of the two-way cylinder are fixedly connected to the front and rear linkage rods respectively.

4. The method for electrolytic polishing of stainless steel pipes according to claim 1, characterized in that: The cleaning plate has a U-shaped structure. A scraper is installed in the middle of the upper surface of the horizontal section of the cleaning plate. The two vertical sections of the cleaning plate are inclined towards the scraper, and spray pipes are installed on the upper surface of both vertical sections of the cleaning plate.

5. The method for electrolytic polishing of stainless steel pipes according to claim 1, characterized in that: A support frame is detachably installed on the left side of the upper end face of the fixed base, and a connecting block that supports the support cylinder and engages with the support cylinder is installed on the right end face of the support frame.

6. The method for electrolytic polishing of stainless steel pipes according to claim 1, characterized in that: A guide frame that slopes downwards from left to right and mates with the right end of the cleaning plate is installed through the lower side of the vertical frame.

7. The method for electrolytic polishing of stainless steel pipes according to claim 1, characterized in that: Multiple ball bearings are evenly distributed on the left end face of the baffle.

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