Electrolytic bath short circuit port bus crimping surface roughening process

Abstract

The invention discloses a roughening process for a crimping surface of a bus at a short-circuit port of an electrolytic cell. The method comprises the following steps: measuring the milling flatness of a crimping surface of a short circuit port, roughening a bus crimping surface with the crimping milling surface flatness meeting the requirement, detecting the grinding precision, roughening the crimping surface of the short circuit port again, detecting the grinding precision for the second time, and coating a protective aluminum surface oxide layer: coating the crimping roughened surface with the protective aluminum surface oxide layer; the method comprises the following steps: cleaning a protective oxide layer coated on a crimping surface before mounting a short circuit port, and airing after cleaning; and roughening the crimping surface of the short circuit port for the second time. By means of the technological process, it can be ensured that the initial machining flatness of the electrolytic cell short circuit port crimping face, the roughness of the roughened crimping face and the prevention of the roughened face from being oxidized all meet the requirements, and the short circuit port pressure drop in the electrolytic cell short circuit construction technology is made to be below 3 mv or even lower.

Description

Technical Field

[0001] The invention relates to the technical field of hardware processing, and in particular to a roughening process for the crimping surface of a busbar at a short-circuit junction of an electrolytic cell. Background Art

[0002] The main function of the busbar at the short-circuit junction of the electrolytic cell is to conduct electricity and short-circuit. The voltage drop at the short-circuit junction has a certain impact on the energy consumption of the electrolytic cell and is one of the main statistical voltage drops of the electrolytic cell energy consumption. In the past, the crimping surface of the busbar at the short-circuit junction of the electrolytic cell was processed for smooth crimping, that is, the two crimping surfaces were milled and crimped together by bolts to increase the contact area of ​​the busbar and reduce the voltage drop. However, practice has shown that the voltage drop of the busbars crimped together by milling has increased to more than 10mv. The voltage drop of the crimping surface that has been roughened is lower, which can reach less than 3mv. Therefore, many large electrolytic cells currently roughen the crimping surface of the busbar at the short-circuit junction of the electrolytic cell during construction.

[0003] The roughening of the crimping surface of the busbar at the short-circuit junction of the electrolytic cell must not only ensure the roughness of the crimping surface Ra3.2, but also ensure the flatness of the crimping surface and prevent the oxidation of the aluminum crimping surface after grinding. To meet these three requirements, a set of effective processing technology must be available. However, the current roughening process has poor operating efficiency and also has shortcomings in meeting the requirements of flatness, roughness and anti-oxidation. Summary of the invention

[0004] Aiming at the defects of the existing roughening process in terms of operating efficiency, flatness, roughness, anti-oxidation and the like, the present invention provides a roughening process for the crimping surface of the busbar at the short-circuit junction of an electrolytic cell, which has higher operating efficiency and better product flatness, roughness and anti-oxidation effects.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: a roughening process for the crimping surface of the busbar of the short-circuit port of the electrolytic cell, which is carried out according to the following steps: (1) Measure the milling flatness of the short-circuit crimping surface; (2) Roughening the busbar crimping surface whose crimping milling surface flatness meets the requirements; (3) Check the grinding accuracy: Apply a uniform layer of red lead powder on the wear-resistant particle side of the grinding plate, put the wear-resistant particle side of the grinding plate in contact with the roughened surface, gently push the grinding plate back and forth 2-3 times, and remove the grinding plate. At this time, the roughened surface part of the short-circuit junction is red, and the rest is the aluminum surface color. The red part represents the higher part of the roughened surface; (4) Roughen the short-circuit crimping surface again: Roughen the red part of the crimping surface after the grinding accuracy is tested with a grinding plate; (5) Secondary inspection of grinding accuracy: Apply a uniform layer of red lead powder on the wear-resistant particle side of the grinding plate again, put the wear-resistant particle side of the grinding plate in contact with the roughened surface, gently push the grinding plate back and forth 2-3 times, and coat more than 90% of the surface. Remove the grinding plate and observe whether the red color of the crimped grinding surface is uniform; (6) Apply protective aluminum surface oxide layer: Apply protective aluminum surface oxide layer on the crimping roughened surface; (7) Cleaning: Before installing the short-circuit junction, clean the protective oxide layer on the crimping surface and dry it after cleaning; (8) Secondary roughening of the crimping surface of the short-circuit joint: Use a wire brush to roughen the cleaned crimping surface again. After roughening, install the crimping surface and tighten it with bolts.

[0006] In step (1), use a knife edge gauge and a feeler gauge to measure the flatness of the crimped milling surface. Place the knife edge of the knife edge gauge perpendicular to the milling surface from different directions and observe whether there is light passing between the knife edge and the milling surface. Where there is light, there is a gap. Use a 0.03mm feeler gauge to measure the gap and ensure that the gap is not greater than 0.03mm.

[0007] The roughening process of step (2) is performed by using an angle grinder with a grinding wheel to improve work efficiency.

[0008] In step (6), the aluminum surface oxide layer is protected by mixing engine oil and diesel in a certain ratio (engine oil: diesel = 2:8) with red lead powder, first storing it indoors and applying one layer, then stacking it outdoors and applying two layers.

[0009] Through the process flow of the present invention, it can be ensured that the initial processing flatness of the crimping surface of the short-circuit port of the electrolytic cell, the roughness of the roughened crimping surface and the prevention of oxidation of the roughened surface all meet the requirements (including: flatness ≤ 0.03 / 1000, contact degree Ra>3.2, tested with a grinding plate and red lead powder, the contact area is more than 80%; the color of the red lead powder on the processed surface does not turn black before installation), so that the short-circuit port voltage drop in the electrolytic cell short-circuit construction technology is below 3mv, or even lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0011] The following is combined with Figure 1 The present invention is further described by specific embodiments: In this embodiment, the roughening process of the crimping surface of the busbar at the short-circuit port of the electrolytic cell is carried out according to the following steps: (1) Measurement of the milling flatness of the short-circuit crimping surface: Use a knife edge gauge and a feeler gauge to measure the flatness of the crimping milling surface. Hold the knife edge of the knife edge gauge perpendicular to the milling surface from different directions and observe whether there is light passing between the knife edge and the milling surface. Where there is light, there is a gap. Use a 0.03mm feeler gauge to measure the gap and ensure that the gap is not greater than 0.03mm.

[0012] (2) Roughening of short-circuit crimping: The busbar crimping surface whose crimping milling surface flatness meets the requirements is roughened. The angle grinder is used to roughen with a grinding wheel instead of the traditional scraper roughening method to improve work efficiency.

[0013] (3) Use a grinding plate to test the grinding accuracy: Apply a uniform layer of red lead powder on the wear-resistant particle side of the grinding plate, put the wear-resistant particle side of the grinding plate in contact with the roughened surface, gently push the grinding plate back and forth 2-3 times, and remove the grinding plate. At this time, the roughened surface of the short-circuit junction is partly red and partly aluminum surface color. The red part represents the higher part of the roughened surface.

[0014] (4) Roughen the short-circuit crimping surface again: Roughen the red part of the crimping surface after checking the grinding accuracy with a grinding plate.

[0015] (5) Use the grinding plate to check the grinding accuracy again: Apply a uniform layer of red lead powder on the wear-resistant particle side of the grinding plate again, put the wear-resistant particle side of the grinding plate in contact with the roughened surface, gently push the grinding plate back and forth 2-3 times, remove the grinding plate, and observe whether the red color of the crimped polished surface is uniform and covers more than 90% of the surface.

[0016] (6) Apply protective coating to the aluminum surface oxide layer: Mix engine oil and diesel in a ratio of 2:8 with red lead powder and apply it on the crimped roughened surface. Apply one layer for indoor storage and two layers for outdoor storage.

[0017] (7) Cleaning of protective layer before installation: Before installing the short-circuit junction, clean the protective oxide layer on the crimping surface with acetone, clean it and let it dry.

[0018] (8) Secondary roughening of the crimping surface of the short-circuit joint: Use a wire brush to roughen the cleaned crimping surface again. After roughening, install the crimping surface and tighten it with bolts.

[0019] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. A roughening process for the crimping surface of a busbar at a short-circuit junction of an electrolytic cell, characterized in that: Follow these steps: (1) Measure the milling flatness of the short-circuit crimping surface; (2) Roughening the busbar crimping surface whose crimping milling surface flatness meets the requirements; (3) Check the grinding accuracy: Apply a uniform layer of red lead powder on the wear-resistant particle side of the grinding plate, put the wear-resistant particle side of the grinding plate in contact with the roughened surface, gently push the grinding plate back and forth 2-3 times, and remove the grinding plate. At this time, the roughened surface part of the short-circuit junction is red, and the rest is the aluminum surface color. The red part represents the higher part of the roughened surface; (4) Roughen the short-circuit crimping surface again: Roughen the red part of the crimping surface after the grinding accuracy is tested with a grinding plate; (5) Secondary inspection of grinding accuracy: Apply a uniform layer of red lead powder on the wear-resistant particle side of the grinding plate again, put the wear-resistant particle side of the grinding plate in contact with the roughened surface, gently push the grinding plate back and forth 2-3 times, and coat more than 90% of the surface. Remove the grinding plate and observe whether the red color of the crimped grinding surface is uniform; (6) Apply protective aluminum surface oxide layer: Apply protective aluminum surface oxide layer on the crimping roughened surface; (7) Cleaning: Before installing the short-circuit junction, clean the protective oxide layer on the crimping surface and dry it after cleaning; (8) Secondary roughening of the crimping surface of the short-circuit joint: Use a wire brush to roughen the cleaned crimping surface again. After roughening, install the crimping surface and tighten it with bolts.

2. The roughening process for the crimping surface of the busbar of the electrolytic cell short-circuit junction according to claim 1 is characterized in that: In step (1), use a knife edge gauge and a feeler gauge to measure the flatness of the crimped milling surface. Place the knife edge of the knife edge gauge perpendicular to the milling surface from different directions and observe whether there is light passing between the knife edge and the milling surface. Where there is light, there is a gap. Use a 0.03mm feeler gauge to measure the gap and ensure that the gap is not greater than 0.03mm.

3. The roughening process for the crimping surface of the busbar of the electrolytic cell short-circuit junction according to claim 1 is characterized in that: The roughening process of step (2) is performed by using an angle grinder with a grinding wheel to improve work efficiency.

4. The roughening process for the crimping surface of the busbar of the electrolytic cell short-circuit junction according to claim 1 is characterized in that: In step (6), the aluminum surface oxide layer is protected by mixing engine oil and diesel in a ratio of 2:8 with red lead powder, first storing it indoors and applying one layer, then stacking it outdoors and applying two layers.

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