CN110965068A - Acid tank acid outlet structure for uniform acid washing of wide titanium belt - Google Patents
Acid tank acid outlet structure for uniform acid washing of wide titanium belt Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/024—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by a combination of dipping and spraying
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Abstract
The invention provides an acid tank acid outlet structure for uniform acid washing of a wide titanium belt, and belongs to the technical field of rolling quality control. This go out sour mouthful structure includes sour groove both sides play sour mouthful, bottom play sour mouthful and top play sour mouthful, and sour groove both sides play sour mouthful connection rectangle leads sour case, and sour groove bottom play sour mouthful sets up trapezoidal baffle-box, and sour groove top play sour mouthful arranges on the sour roof beam of top play. The structure greatly solves the problem of uneven pickling of the current wide titanium belt, can ensure the pickling effect, is convenient to use and can be conveniently popularized.
Description
Technical Field
The invention relates to the technical field of rolling quality control, in particular to an acid tank acid outlet structure for uniform acid washing of a wide titanium belt.
Background
The wide titanium belt has wide application in the fields of aviation, ocean, nuclear power and the like, and has wide development prospect. In the wide titanium strip cold rolling production, in order to ensure good surface quality after the wide titanium strip is rolled and stability of the rolling process, an acid washing procedure is required to remove an oxide layer on the surface of the titanium strip. In the comparison of the thickness distribution data of the cross section of the titanium belt before and after on-site pickling, the thickness reduction quantity of the edge part and the middle part of the titanium belt is uneven in the pickling process, so that a thickness sharp point appears in the middle part after pickling, the convexity of the cross section is obviously increased after pickling, and the plate shape problems of medium wave, rib rising and the like of the wide titanium belt in the subsequent rolling process are easily caused. The existing arrangement method of acid outlets of a wide titanium belt pickling tank mostly adopts a direct-spraying type combination of the acid outlets at two sides of the pickling tank and the acid outlet at the bottom, wherein four acid outlets at two sides of the pickling tank and the side wall of the pickling tank form 30 degrees, one acid outlet at the bottom is vertical to the tank bottom and faces upwards, and the acid outlets are designed and arranged to cause the difference of the turbulence intensity of acid liquor along the transverse direction of a titanium belt in the pickling process, so that the transverse pickling of the titanium belt is not uniform. The acid tank acid outlet design and arrangement method for uniformly pickling the wide titanium belt can obviously improve the production quality of the pickling process of the wide titanium belt.
Disclosure of Invention
The invention aims to provide an acid tank acid outlet structure for uniform acid washing of a wide titanium belt.
The structure comprises acid outlets on two sides of an acid tank, an acid outlet at the bottom of the acid tank and an acid outlet at the top of the acid tank, wherein the acid outlets on two sides of the acid tank are connected with a rectangular acid guide box, the acid outlet at the bottom of the acid tank is provided with a trapezoidal buffer box, and the acid outlet at the top of the acid tank is arranged on an acid outlet beam at the top.
Wherein, the acid outlet beam at the top is two, and three rectangular acid outlet ports at the top of the acid tank are uniformly arranged on each acid outlet beam at the top.
Round holes are uniformly formed in the surface of the trapezoidal buffer box.
Two ends of the top acid outlet beam are respectively connected with the rectangular acid guide boxes on two sides, and the rectangular acid guide boxes are sealed with the side walls of the acid tank.
The inner diameter of the top acid outlet beam is consistent with the acid outlets on the two sides of the acid tank, the acid outlet on the top of the acid tank is in the shape of a flat slit, the sizes of the acid outlet are the same, and the acid outlet is uniformly distributed along the length direction of the top acid outlet beam.
The opening angles of acid outlets at the tops of the three acid tanks are 45 degrees downward of the horizontal line and opposite to the movement direction of the titanium belt.
The trapezoid buffer box is sealed with the bottom of the acid tank and is arranged right above the acid outlet at the bottom of the acid tank.
The number of the round holes is not less than 3, and the sizes of the round holes are the same.
The structure is designed and arranged at the acid outlet of the acid tank under the condition that the overall structure of the acid tank is unchanged, the acid outlet of the acid tank is changed as follows, the acid outlet direct-injection type acid outlet on the two sides of the acid tank is designed and modified into the top acid outlet beam rectangular acid outlet oblique jet type slit acid outlet, and the acid outlet direct-injection type acid outlet on the bottom is designed and modified into the trapezoidal buffer tank circular hole acid outlet. Adding rectangular acid guide boxes at acid outlets on two sides of the acid tank and connecting the rectangular acid guide boxes with acid outlet beams at the top of the acid tank; the acid outlet beam is provided with three sections of rectangular acid outlets; the bottom acid outlet is additionally provided with a trapezoidal buffer box with a plurality of round holes. In the process of pickling the wide titanium strip, acid liquor enters from acid outlets on two sides of the acid tank, enters into the top acid outlet beam through the rectangular acid guide boxes additionally arranged on two sides of the inner wall of the acid tank, is sprayed into the acid tank through the 3 sections of rectangular acid outlets on the acid outlet beam, and is sprayed into the acid tank through a plurality of round holes in the trapezoidal buffer boxes additionally arranged at the acid outlet on the bottom.
In the structure, acid outlets at symmetrical positions on two sides introduce acid liquor into the same top acid outlet beam through a rectangular acid guide box. The number of round holes formed in the upper surface of the trapezoidal buffer box is gradually increased from the narrow side to the long side of the trapezoid.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the structure fully considers the leakproofness and the structural integrity of the acid tank after modification. Acid outlets at symmetrical positions on two sides of the acid tank are respectively connected with two sides of the acid outlet beam at the top through a rectangular acid guide box, so that the uniformity of introducing acid liquid into the acid outlet beam is ensured, and the uniform and symmetrical flow of acid in the width direction is ensured. Under the arrangement of an acid outlet of an original acid tank, the turbulent flow intensity of acid liquid on the surface of the titanium belt in the width direction is not uniformly distributed, and the turbulent flow intensity gradually decreases from the two side edges to the middle. According to the invention, the acid liquor is uniformly sprayed into the acid tank from the rectangular acid outlet of the top acid outlet beam, and the turbulent flow intensity of the acid liquor is uniformly distributed in the width direction of the surface of the titanium strip, wherein the turbulent flow intensity of the acid liquor is represented as that the turbulent flow intensity of the acid liquor is slightly increased from the two side edges to the middle part. In actual pickling, the pickling supplied materials often have certain convexity, and the pickling mode that the middle part turbulence intensity is high in the width direction is adopted, so that the pickling strength of the middle part can be enhanced, the excessive thinning of the edge part can be slowed down, the convexity of the pickled titanium strip can be improved, and the problem of nonuniform pickling caused by the fact that the two-side direct-injection type acid outlet is adopted in the pickling of the wide titanium strip can be avoided.
Drawings
FIG. 1 is a first structural diagram of an acid outlet of an acid tank for uniform acid washing of a wide titanium strip according to the present invention;
FIG. 2 is a schematic diagram of the acid outlet structure of the acid tank for uniform acid washing of a wide titanium strip according to the present invention;
FIG. 3 is a schematic structural view of a rectangular acid guiding box with acid outlets at two sides of an acid tank in the acid tank acid outlet structure for uniform acid washing of wide titanium belts according to the present invention;
FIG. 4 is a schematic structural view of a trapezoidal buffer box at the acid outlet at the bottom of the acid tank in the acid outlet structure of the acid tank for uniformly pickling wide titanium belts of the invention;
FIG. 5 is a schematic diagram of an acid outlet beam at the top of an acid tank in the acid outlet structure of the acid tank for uniform pickling of wide titanium belts according to the present invention;
FIG. 6 is a comparison graph of the turbulence intensity of the surface of a conventional titanium strip after the acid outlets of the direct-injection acid tank on two sides of the wide titanium strip and the acid outlets of the acid tank for uniform acid washing of the wide titanium strip are respectively implemented;
FIG. 7 is a comparison graph of the turbulence intensity of the surface of a titanium strip after the acid outlet beams at the top of an acid tank adopt different numbers of rectangular acid outlets in the acid outlet structure of the acid tank for uniformly pickling the wide titanium strip;
FIG. 8 is a comparison graph of the surface turbulence intensity of a titanium strip after the rectangular acid outlet of the acid outlet beam at the top of the acid tank adopts different opening angles in the acid outlet structure of the acid tank for uniform acid washing of the wide titanium strip;
FIG. 9 is a sectional thickness variation diagram and an acid-washing reduction diagram of a titanium strip before and after acid-washing by using the direct-injection acid-bath acid-outlet structure on both sides of the wide titanium strip, wherein (a) is the sectional thickness variation diagram of the titanium strip before and after acid-washing, and (b) is the acid-washing reduction diagram;
FIG. 10 is a diagram showing the thickness change of the cross section of a titanium strip before and after the pickling of the acid outlet structure of the acid bath for uniformly pickling a wide titanium strip according to the present invention.
Wherein: 1-acid outlets at two sides of the acid tank; 2-acid outlet at the bottom of the acid tank; 3-acid tank bottom; 4-rectangular acid guide box; 5-acid beam is discharged from the top; 6-acid outlet at the top of the acid tank; 7-a trapezoidal buffer tank; 8-round hole.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description is made with reference to the accompanying drawings and specific embodiments.
The invention provides an acid outlet structure of an acid tank for uniformly pickling wide titanium belts.
At present, acid tanks mostly adopt 4 acid outlets on two sides and 1 acid outlet at the bottom to directly spray acid in the acid pickling process of a wide titanium strip, the acid outlet arrangement mode seriously influences the acid pickling uniformity of the wide titanium strip, so that the thickness reduction quantity of the edge part and the middle part of the titanium strip is not uniform, the problems of increased convexity, sharp point in the middle part and the like of the titanium strip after acid pickling are caused, and the adverse effects are caused on the rolling stability and the plate shape quality of the follow-up wide titanium strip.
As shown in fig. 1 and 2, the acid outlet structure of the present invention includes acid outlets 1 at two sides of the acid tank, acid outlets 2 at the bottom of the acid tank, and acid outlets 6 at the top of the acid tank, wherein the acid outlets 1 at two sides of the acid tank are connected to a rectangular acid guide box 4, the acid outlets 2 at the bottom of the acid tank are provided with a trapezoidal buffer box 7, and the acid outlets 6 at the top of the acid tank are arranged on a top acid outlet beam 5.
As shown in fig. 5, there are two top acid outlet beams 5, and three rectangular acid tank top acid outlets 6 are uniformly arranged on each top acid outlet beam 5.
As shown in FIG. 4, round holes 8 are uniformly formed on the surface of the trapezoidal buffer tank 7.
As shown in FIG. 3, two ends of the top acid outlet beam 5 are respectively connected with the rectangular acid guide boxes 4 at two sides, and the rectangular acid guide boxes 4 are sealed with the side walls of the acid tank.
The inner diameter of the top acid outlet beam 5 is consistent with the acid outlets 1 on the two sides of the acid tank, and the acid outlet 6 on the top of the acid tank on the acid outlet beam 5 on the top of the acid tank is in the shape of a flat slit, has the same size and is uniformly arranged along the length direction of the top acid outlet beam 5.
The opening angles of the acid outlets 6 at the tops of the three acid tanks are 45 degrees downward of the horizontal line and are opposite to the moving direction of the titanium belt.
The trapezoid buffer tank 7 is sealed with the acid tank bottom 3, and the trapezoid buffer tank 7 is arranged right above the acid outlet 2 at the acid tank bottom.
The number of the round holes 8 is not less than 3, and the sizes of the round holes 8 are the same.
Experiments prove that under the arrangement of the acid outlet of the original acid tank, the turbulence intensity of the acid liquid on the surface of the titanium strip in the width direction is unevenly distributed, and the turbulence intensity is gradually reduced from the two side edges to the middle part, which is shown in the attached figure 6. The acid liquor is uniformly sprayed into the acid tank from the rectangular acid outlet of the top acid outlet beam, the turbulent flow intensity of the acid liquor is uniformly distributed in the width direction of the surface of the titanium strip, and the turbulent flow intensity of the acid liquor is represented as that the turbulent flow intensity of the acid liquor increases gradually from the side parts to the middle part of the titanium strip, and the structure is shown in figure 6. In actual pickling, the pickling incoming material often has certain convexity, and the pickling mode that the middle part turbulence intensity is high in the width direction is adopted, so that the pickling strength of the middle part can be enhanced, the excessive thinning of the edge part can be slowed down, the convexity of the pickled titanium strip can be improved, and the problem of uneven pickling caused by the fact that the two-side direct-injection type acid outlet is adopted in the pickling of the wide titanium strip can be avoided.
The number of the rectangular acid outlet slits is three. As shown in the attached figure 7, the comparison shows that the surface turbulence intensity of the titanium belt under the slit structure is lower, and the normal operation of turbulent acid washing is difficult to ensure; under the three-slit structure, the surface turbulence intensity of the titanium belt is moderate, the turbulence intensity distribution is relatively uniform, and meanwhile, the pickling strengthening is carried out on the middle part of the titanium belt, so that the method plays an important role in reducing the convexity of the pickled titanium belt; under the five-slit structure, the turbulence intensity is too low at the positions of two sides of the titanium strip at a certain distance from the edge, which can cause uneven pickling, and the thickness of the position after pickling is not reduced enough, thus failing to provide a good section profile for subsequent cold rolling.
The opening of the rectangular acid outlet is at an angle of 45 degrees downwards from the horizontal line and is opposite to the moving direction of the titanium belt. Referring to fig. 8, it is found through comparison that when the opening angle is 30 °, the turbulent intensity curve is smoother, the pickling uniformity is good, but the turbulent intensity is relatively low, and the pickling effect cannot be ensured; when the opening angle is 45 degrees, the overall turbulence intensity is improved, the curve is relatively smooth, and the pickling uniformity is good; when the opening angle is 60 degrees, the turbulence intensity in the middle range is very high, the turbulence intensity is extremely different from that of the edge part, the middle part is easy to be over-pickled, and finally the pickling is not uniform. The 45-degree oblique jet slit acid spraying mode can enhance the relative flow of the acid liquid and the titanium belt, improve the turbulence intensity of the surface of the titanium belt, improve the condition that the pickling thickness of the middle part of the titanium belt is insufficient, and accelerate the pickling speed.
The bottom acid outlet is provided with the round hole on the upper surface by additionally arranging the trapezoidal buffer box, so that the uniformity and consistency of acid liquor spraying from the bottom acid outlet are ensured, the problem that the acid washing on the upper surface and the lower surface is uneven due to the fact that the acid outlet position is too concentrated and the scouring corrosion on the middle part of the lower surface of the titanium belt is too strong under the direct-spraying type acid outlet mode of the bottom acid outlet is avoided.
The acid outlet design and arrangement method of the acid tank can ensure uniform acid washing of the wide titanium belt and ensure structural integrity and sealing performance of the acid tank after modification. The invention has simple design and arrangement method, convenient use and operation and is beneficial to popularization and application.
The following description is given with reference to specific examples.
In the specific design, the rectangular acid guide box 4 guides the acid liquor entering from the acid outlets at two sides into the acid outlet beam 5 at the top; acid liquor flowing out of the acid outlets 1 on the two sides of the acid tank enters the top acid outlet beam 5 through the rectangular acid guide box 4, so that the uniformity of introduction of the acid liquor of the top acid outlet beam is ensured; the two top acid outlet beams 5 are spaced at a certain distance, the inner diameter of each top acid outlet beam is consistent with the acid outlet 1 on the two sides of the acid tank, and acid liquor is sprayed into the acid tank from the acid outlet 6 on the top of the three rectangular acid tanks of the top acid outlet beams 5; the acid outlet 6 at the top of the acid tank is in the shape of a flat slit, has the same size and is uniformly arranged along the length direction of the acid outlet beam, and the opening of the acid outlet is 45 degrees downward from the horizontal line and is opposite to the movement direction of the titanium belt, so that the uniformity of acid liquid injection is ensured; trapezoidal buffer tank 7 is sealed to be arranged just above acid outlet 2 in the acid vat bottom to evenly set up the round hole 8 of a plurality of size unanimity on the buffer tank upper surface, guarantee that the acidizing fluid that the acid outlet of bottom entered can evenly spout into the acid vat.
The working principle of the invention is as follows: the acid outlets at the symmetrical positions on the two sides of the acid tank are respectively connected with the two sides of the acid outlet beam at the top through the rectangular acid guide box, so that the uniformity of introducing acid liquor into the acid outlet beam is ensured, and the uniform and symmetrical flow of the acid in the width direction is ensured. Acid liquor is evenly sprayed into the acid tank from the rectangular acid outlets which are arranged in three equal parts on the acid outlet beam at the top, so that the uniformity of the turbulence intensity of the acid liquor in the width direction of the surface of the titanium strip is ensured, and the problem of uneven acid washing caused by directly spraying acid from the acid outlets at two sides in the acid washing of the wide titanium strip is solved. The opening of the rectangular acid outlet is downward at an angle of 45 degrees with the horizontal line and is in an oblique jet acid spraying mode opposite to the movement direction of the titanium strip, so that the relative flow of the acid liquid and the titanium strip can be enhanced, the turbulence intensity of the surface of the titanium strip is improved, the condition that the thickness of the middle part of the titanium strip is insufficient in acid washing can be improved, and the acid washing speed is accelerated. The bottom acid outlet is provided with the trapezoidal buffer tank and the round small holes on the upper surface, so that the uniformity and consistency of acid liquor injection from the bottom acid outlet are ensured, and the problems that the acid outlet position is too concentrated, the scouring corrosion on the middle part of the lower surface of the titanium belt is too strong, and the acid washing on the upper surface and the lower surface is not uniform are avoided. The acid outlet design arrangement method of the acid tank can ensure uniform acid washing of the wide titanium belt and ensure structural integrity and sealing performance of the acid tank after modification. The invention has simple design and arrangement method, convenient use and operation and is beneficial to popularization and application.
Referring to the attached figure 9, before the process optimization, the titanium strip has the problems of large convexity, obvious edge thinning, convex peaks in the middle and the like after acid pickling, and the middle part of the titanium strip is not subjected to acid pickling from the aspect of acid pickling thinning amount; referring to the attached figure 10, after the process is optimized, the titanium strip is uniformly reduced by acid washing, and the profile of the section is improved.
The foregoing is a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should be considered as the protection scope of the present invention.
Claims (8)
1. The utility model provides an acid tank acid outlet structure of even pickling of broad width titanium strip which characterized in that: the acid guide device comprises acid outlets (1) on two sides of an acid tank, an acid outlet (2) on the bottom of the acid tank and an acid outlet (6) on the top of the acid tank, wherein the acid outlets (1) on two sides of the acid tank are connected with a rectangular acid guide box (4), the acid outlet (2) on the bottom of the acid tank is provided with a trapezoidal buffer box (7), and the acid outlet (6) on the top of the acid tank is arranged on an acid outlet beam (5) on the top.
2. The acid tank acid outlet structure for uniform acid washing of wide titanium belts according to claim 1, wherein: the number of the top acid outlet beams (5) is two, and three rectangular acid outlet openings (6) at the top of the acid tank are uniformly arranged on each top acid outlet beam (5).
3. The acid tank acid outlet structure for uniform acid washing of wide titanium belts according to claim 1, wherein: round holes (8) are uniformly formed in the surface of the trapezoidal buffer box (7).
4. The acid tank acid outlet structure for uniform acid washing of wide titanium belts according to claim 1, wherein: two ends of the top acid outlet beam (5) are respectively connected with the rectangular acid guide boxes (4) on two sides, and the rectangular acid guide boxes (4) are sealed with the side wall of the acid tank.
5. The acid tank acid outlet structure for uniform acid washing of wide titanium belts according to claim 1, wherein: the inner diameter of the top acid outlet beam (5) is consistent with that of the acid outlets (1) on the two sides of the acid tank, the acid outlet (6) on the acid outlet beam (5) on the top of the acid tank is in the shape of a flat slit, and the acid outlet is the same in size and is uniformly arranged along the length direction of the top acid outlet beam (5).
6. The acid tank acid outlet structure for uniform acid washing of wide titanium strips according to claim 2, wherein: the opening angles of the acid outlets (6) at the tops of the three acid tanks are 45 degrees downward of the horizontal line and opposite to the movement direction of the titanium belt.
7. The acid tank acid outlet structure for uniform acid washing of wide titanium belts according to claim 1, wherein: the trapezoidal buffer box (7) is sealed with the bottom (3) of the acid tank, and the trapezoidal buffer box (7) is arranged right above the acid outlet (2) at the bottom of the acid tank.
8. The acid tank acid outlet structure for uniform acid washing of wide titanium belts according to claim 3, wherein: the number of the round holes (8) is not less than 3, and the sizes of the round holes (8) are the same.
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| CN201911099057.0A CN110965068B (en) | 2019-11-11 | 2019-11-11 | Acid tank acid outlet structure for uniform acid washing of wide titanium belt |
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| CN201911099057.0A CN110965068B (en) | 2019-11-11 | 2019-11-11 | Acid tank acid outlet structure for uniform acid washing of wide titanium belt |
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| CN110965068B CN110965068B (en) | 2020-12-08 |
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| CN108624895A (en) * | 2018-08-03 | 2018-10-09 | 扬州道明智控科技有限公司 | A kind of steel band acid dip pickle |
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| DE102008032933A1 (en) * | 2008-07-12 | 2010-01-14 | Sms Siemag Aktiengesellschaft | Apparatus and method for spraying pickling and / or rinsing liquid on a metallic material to be treated |
| CN101665946A (en) * | 2008-09-01 | 2010-03-10 | 鞍钢股份有限公司 | Device and method for controlling cold-rolling steel strip pickling turbulence |
| CN106011901A (en) * | 2016-07-04 | 2016-10-12 | 无锡联创薄板有限公司 | Strip steel acid pickling device conducting oblique spraying |
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