Novel tube shell cleaning method

Abstract

The invention relates to the technical field of tube shell cleaning processes, in particular to a novel tube shell cleaning method. The method has the advantages that hydrochloric acid and hydrogen peroxide are proportioned in the first solution, the tube shell is placed in the solution for oxidation reaction, smudginess, oxidation parts and ceramic smudginess parts on the metal surface fall off, then hydrochloric acid is used for certain dilution, reduction reaction is carried out on the tube shell, dry printing traces and oxidation parts on the surface of the tube shell are removed, and the tube shell is obtained. Cleaning is carried out in the midway under flowing deionized water, it is ensured that residual liquid on the surface of the tube shell is cleaned away, impurities adsorbed on the surface of the tube shell are removed through ultrasonic cleaning, oxidized dirt on the surface of the tube shell can be removed in an acid pickling mode, and the tube shell can strongly react with a prepared solution of acid and hydrogen peroxide; and small burrs at some unobservable positions and observable positions of the tube shell react with the tube shell, so that the burrs are shortened or eliminated, and the lengths of the burrs which cannot be eliminated are shortened while the diameter of the tip is increased.

Description

Technical Field

[0001] The invention relates to the technical field of tube shell cleaning technology, in particular to a new tube shell cleaning method. Background Art

[0002] The third generation of low-light-level image intensifiers is mainly composed of two parts: the photocathode assembly and the anode assembly. The anode assembly consists of a tube shell, a fluorescent screen, and a microchannel plate. The tube shell is the main structure of the image intensifier, supporting the photocathode and placing the microchannel plate and the fluorescent screen. The three form a three-layer structure from the photocathode to the microchannel plate and then to the fluorescent screen through the tube shell. Inside the image intensifier, the photocathode converts light into photoelectrons through the gallium arsenide surface, and the photoelectrons are multiplied through the microchannel plate. The fluorescent screen then converts the photoelectrons into optical signals that become visible images. In order to achieve the stability of these processes, a clean ultra-high vacuum environment needs to be maintained inside the tube shell.

[0003] During the sealing process of the tube shell, the ceramic parts will be cleaned, the metal parts will be polished and cleaned, and then the metal parts and ceramic parts will be welded in sequence according to the structural order using silver-copper solder. The welded tube shell will be cleaned, and after high-temperature baking and degassing, it will be put into use in the production of image intensifiers. However, it is difficult to remove dirt on the ceramic surface, metal oxidation marks, and fine burrs on the metal edge with general cleaning processes.

[0004] At present, the main difficulties of the third-generation low-light image intensifier are lifespan, signal-to-noise ratio, equivalent background and other performance issues. The lifespan depends on the vacuum degree and internal degassing in the tube. The vacuum degree in the tube is determined by the internal pressure sealing cavity of the tube making table, and the internal degassing of the bare tube is composed of the degassing of the tube shell and the microchannel plate. The vacuum degree and cleanliness of the tube affect the equivalent background and signal-to-noise ratio at the same time. If the tube shell is not cleaned thoroughly, too much gas is released in the tube, and the internal pollution will affect the overall performance of the bare tube.

[0005] The anode assembly is the most easily discharged part of the bare tube. The tube shell as the overall structure carries the phosphor screen and the microchannel plate at the same time, so it is very easy for the tube shell to discharge with the phosphor screen and the microchannel plate. When sharp burrs of a certain length appear on the metal parts of the tube shell and the adjacent parts of the phosphor screen and the microchannel plate, the burrs and the phosphor screen and the microchannel plate are very likely to produce tip discharge under high voltage. At the same time, since the tube shell is a multi-layer structure, it is impossible to observe whether there are burrs in some parts. Summary of the invention

[0006] The object of the present invention is to solve at least one of the technical drawbacks.

[0007] Therefore, an object of the present invention is to provide a new tube shell cleaning method to solve the problems mentioned in the background technology and overcome the shortcomings of the prior art.

[0008] In order to achieve the above-mentioned purpose, an embodiment of one aspect of the present invention provides a new tube shell cleaning method, comprising the following steps: 1) using detergent or washing powder and water to prepare a solution to remove oil from the tube shell;

[0009] 2) Use deionized water to clean the shell three times, and then use ultrasonic waves to submerge the shell in deionized water for 10-15 minutes;

[0010] 3) Use hydrochloric acid, hydrogen peroxide and deionized water to prepare a cleaning solution, soak the tube shell in the solution for 30 seconds, cool the pickling solution in a water bath during pickling, and control the pickling solution temperature at 17℃~25℃;

[0011] 4) Rinse the tube shell under flowing deionized water for 5 minutes;

[0012] 5) Use hydrochloric acid and deionized water to prepare pickling solution, heat the pickling solution to 75℃-85℃, and soak the tube shell in the solution for 5s;

[0013] 6) Rinse under running tap water for 5 minutes;

[0014] 7) Rinse under running deionized water for 5 minutes;

[0015] 8) Ultrasonicate a mixture of 3% alkaline detergent and 0.5% neutral detergent for 10 minutes;

[0016] 9) Rinse under running deionized water for 10 minutes, changing the water 3 times;

[0017] 10) Ultrasonicate in deionized water for 10 min, and keep the deionized water flowing during the ultrasonication;

[0018] 11) Rinse under running deionized water for 10 minutes;

[0019] 12) Ultrasonicate in deionized water for 10 min, and keep the deionized water flowing during the ultrasonication;

[0020] 13) Rinse under running deionized water for 15 minutes;

[0021] 14) Ultrasonication in alcohol for 10 min;

[0022] 15) Dry in an oven at 100°C.

[0023] Preferably, in any of the above schemes, the ultrasonic cleaning in step 2), step 8), step 10), step 12) and step 14) is performed using a 120Khz ultrasonic cleaning instrument, and the power of the ultrasonic cleaning instrument is 200W.

[0024] The technical effects achieved by adopting the above scheme are:

[0025] Preferably, in any of the above schemes, the ratio of the cleaning solution in step 3) is 1 part of hydrochloric acid, 2 parts of hydrogen peroxide and 10 parts of deionized water.

[0026] The technical effects achieved by adopting the above scheme are:

[0027] Preferably, in any of the above schemes, the temperature of the pickling solution in step 3) is controlled at 7°C.

[0028] The technical effects achieved by adopting the above scheme are:

[0029] Preferably, in any of the above schemes, the pickling solution is heated to 75° C. in step 5).

[0030] The technical effects achieved by adopting the above scheme are:

[0031] Preferably, in any of the above schemes, the ratio of the pickling solution in step 5) is 4 parts hydrochloric acid and 1 part deionized water.

[0032] The technical effects achieved by adopting the above scheme are:

[0033] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0034] Compared with the traditional cleaning method, the new tube shell cleaning method performs two solution cleanings on the tube shell. In the first solution, hydrochloric acid and hydrogen peroxide are mixed in a certain ratio, and the tube shell is placed in the solution for oxidation reaction to make the dirty oxidized part of the metal surface and the dirty part of the ceramic fall off. Then, hydrochloric acid is used to dilute the tube shell to a certain extent and then the tube shell is reduced to remove the dry marks and oxidized parts on the surface of the tube shell, making the tube shell bright and full of metallic luster. In the middle, it is cleaned under flowing deionized water to ensure that the residual liquid on the surface of the tube shell is cleaned, and then ultrasonic cleaning is performed to remove the surface of the tube shell. It absorbs impurities to ensure the cleanliness of the tube shell surface. While removing oil stains on the tube shell surface, it can also clean the tube shell by means of acid-prepared solution. The pickling method can remove oxidized dirt on the tube shell surface and reduce vacuum pollution and gas release inside the tube; remove dirt on the tube shell ceramic and reduce leakage current on the ceramic surface; the tube shell will react strongly with the solution prepared by acid and hydrogen peroxide, causing some tiny burrs at unobservable and observable positions of the tube shell to react with it, shortening or eliminating these burrs. If they cannot be eliminated, their length will be shortened while the tip diameter will be enlarged, reducing the probability of discharge at the tip. DETAILED DESCRIPTION

[0035] The present invention is further described below, but the protection scope of the present invention is not limited to the following description.

[0036] Embodiment 1: A new tube shell cleaning method, which comprises the following steps:

[0037] 1) Use detergent or washing powder and water to prepare a solution to degrease the tube shell;

[0038] 2) Use deionized water to clean the tube shell three times, and then use ultrasonic to submerge the tube shell in deionized water for 10 minutes;

[0039] 3) Use hydrochloric acid, hydrogen peroxide and deionized water to prepare a cleaning solution, soak the tube shell in the solution for 30 seconds, cool the pickling solution in a water bath during pickling, and control the pickling solution temperature at 17°C;

[0040] 4) Rinse the tube shell under flowing deionized water for 5 minutes;

[0041] 5) Use hydrochloric acid and deionized water to prepare pickling solution, heat the pickling solution to 75°C, and soak the tube shell in the solution for 5 seconds;

[0042] 6) Rinse under running tap water for 5 minutes;

[0043] 7) Rinse under running deionized water for 5 minutes;

[0044] 8) Ultrasonicate a mixture of 3% alkaline detergent and 0.5% neutral detergent for 10 minutes;

[0045] 9) Rinse under running deionized water for 10 minutes, changing the water 3 times;

[0046] 10) Ultrasonicate in deionized water for 10 min, and keep the deionized water flowing during the ultrasonication;

[0047] 11) Rinse under running deionized water for 10 minutes;

[0048] 12) Ultrasonicate in deionized water for 10 min, and keep the deionized water flowing during the ultrasonication;

[0049] 13) Rinse under running deionized water for 15 minutes;

[0050] 14) Ultrasonication in alcohol for 10 min;

[0051] 15) Dry in an oven at 100°C.

[0052] As an optional technical solution of the present invention, the ultrasonic cleaning in step 2), step 8), step 10), step 12) and step 14) is performed using a 120Khz ultrasonic cleaning instrument, and the power of the ultrasonic cleaning instrument is 200w.

[0053] As an optional technical solution of the present invention, the ratio of the cleaning solution in step 3) is 1 part of hydrochloric acid, 2 parts of hydrogen peroxide and 10 parts of deionized water.

[0054] As an optional technical solution of the present invention, the ratio of the pickling solution in step 5) is 4% hydrochloric acid and 1% deionized water.

[0055] This embodiment uses a shorter ultrasonic cleaning time and a lower temperature, which can reduce the damage to the tube shell caused by cleaning.

[0056] Embodiment 2: A new tube shell cleaning method, which comprises the following steps:

[0057] 1) Use detergent or washing powder and water to prepare a solution to degrease the tube shell;

[0058] 2) Use deionized water to clean the tube shell three times, and then use ultrasonic to submerge the tube shell in deionized water for 15 minutes;

[0059] 3) Use hydrochloric acid, hydrogen peroxide and deionized water to prepare a cleaning solution, soak the tube shell in the solution for 30 seconds, cool the pickling solution in a water bath during pickling, and control the pickling solution temperature at 25°C;

[0060] 4) Rinse the tube shell under flowing deionized water for 5 minutes;

[0061] 5) Use hydrochloric acid and deionized water to prepare pickling solution, heat the pickling solution to 85°C, and soak the tube shell in the solution for 5 seconds;

[0062] 6) Rinse under running tap water for 5 minutes;

[0063] 7) Rinse under running deionized water for 5 minutes;

[0064] 8) Ultrasonicate a mixture of 3% alkaline detergent and 0.5% neutral detergent for 10 minutes;

[0065] 9) Rinse under running deionized water for 10 minutes, changing the water 3 times;

[0066] 10) Ultrasonicate in deionized water for 10 min, and keep the deionized water flowing during the ultrasonication;

[0067] 11) Rinse under running deionized water for 10 minutes;

[0068] 12) Ultrasonicate in deionized water for 10 min, and keep the deionized water flowing during the ultrasonication;

[0069] 13) Rinse under running deionized water for 15 minutes;

[0070] 14) Ultrasonication in alcohol for 10 min;

[0071] 15) Dry in an oven at 100°C.

[0072] This embodiment adopts a higher cleaning temperature and a longer ultrasonic cleaning time, which further improves the cleaning effect.

[0073] In summary, compared with the traditional cleaning method, the new tube shell cleaning method performs two solution cleanings on the tube shell. In the first solution, hydrochloric acid and hydrogen peroxide are used in a certain ratio, and the tube shell is placed in the solution for oxidation reaction to make the dirty oxidized part of the metal surface and the dirty part of the ceramic fall off. Then, hydrochloric acid is used to dilute the tube shell to a certain extent and then the tube shell is reduced to remove the dry marks and oxidized parts on the surface of the tube shell, making the tube shell bright and full of metallic luster. In the middle of the process, it is cleaned under flowing deionized water to ensure that the residual liquid on the surface of the tube shell is cleaned, and then ultrasonic cleaning is used to remove impurities adsorbed on the surface of the tube shell to ensure the cleanliness of the surface of the tube shell. While removing the oil on the surface of the tube shell, the tube shell can also be cleaned by acid preparation solution. The acid cleaning method can remove oxidized dirt on the surface of the tube shell, reduce the vacuum pollution inside the tube and its gas release; remove the dirt on the ceramic of the tube shell and reduce the leakage current on the ceramic surface; the tube shell will react strongly with the preparation solution of acid and hydrogen peroxide, so that some small burrs at the unobservable and observable positions of the tube shell will react with it, so that these burrs will become shorter or eliminated, and those that cannot be eliminated will have their length shortened while the tip diameter will be enlarged, reducing the probability of discharge at the tip.

[0074] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new tube shell cleaning method, Features: The following steps are involved: 1) Use detergent or washing powder and water to prepare a solution to degrease the tube shell; 2) Use deionized water to clean the shell three times, and then use ultrasonic waves to submerge the shell in deionized water for 10-15 minutes; 3) Use hydrochloric acid, hydrogen peroxide and deionized water to prepare a cleaning solution, soak the tube shell in the solution for 30 seconds, cool the pickling solution in a water bath during pickling, and control the pickling solution temperature at 17℃~25℃; 4) Rinse the tube shell under flowing deionized water for 5 minutes; 5) Use hydrochloric acid and deionized water to prepare pickling solution, heat the pickling solution to 75℃-85℃, and soak the tube shell in the solution for 5s; 6) Rinse under running tap water for 5 minutes; 7) Rinse under running deionized water for 5 minutes; 8) Ultrasonicate a mixture of 3% alkaline detergent and 0.5% neutral detergent for 10 minutes; 9) Rinse under running deionized water for 10 minutes, changing the water 3 times; 10) Ultrasonicate in deionized water for 10 min, and keep the deionized water flowing during the ultrasonication; 11) Rinse under running deionized water for 10 minutes; 12) Ultrasonicate in deionized water for 10 min, and keep the deionized water flowing during the ultrasonication; 13) Rinse under running deionized water for 15 minutes; 14) Ultrasonication in alcohol for 10 min; 15) Dry in an oven at 100°C.

2. A new tube shell cleaning method according to claim 1, Features: The ultrasonic cleaning in step 2), step 8), step 10), step 12) and step 14) is performed using a 120Khz ultrasonic cleaning instrument with a power of 200W.

3. A new tube shell cleaning method according to claim 2, Features: The ratio of the cleaning solution in step 3) is 1 part of hydrochloric acid, 2 parts of hydrogen peroxide and 10 parts of deionized water.

4. A new tube shell cleaning method according to claim 3, Features: In step 3), the temperature of the pickling solution is controlled at 7°C.

5. A new tube shell cleaning method according to claim 4, Features: In the step 5), the pickling solution is heated to 75°C.

6. A new tube shell cleaning method according to claim 5, Features: In the step 5), the ratio of the pickling solution is 4:1 of hydrochloric acid and 1:1 of deionized water.