A mesh plate processing method and system applied to an air knife, the air knife and equipment

Abstract

The application discloses a mesh plate processing method, system, air knife and equipment applied to the air knife. The method comprises the following steps: obtaining an existing mesh hole diameter of an existing mesh plate and a distance between the existing mesh hole and a gas inlet according to the structure of the existing mesh plate; determining an initial mesh hole diameter in the improved mesh plate based on the air knife parameters, the existing mesh hole diameter and the distance between the existing mesh hole and the gas inlet; establishing a finite element model and configuring the initial mesh hole diameter in the improved mesh plate into the finite element model to obtain an improved mesh plate model with the mesh hole diameter gradually increasing from the direction of the gas inlet; calculating the first air knife lip outlet airflow pressure distribution of the improved mesh plate model in the width direction of the air knife by using a fluid simulation software, and correcting the initial mesh hole diameter by using the first air knife lip outlet airflow pressure distribution and constraint conditions to obtain a corrected diameter in the improved mesh plate; wherein the second air knife lip outlet airflow pressure distribution formed by the corrected diameter meets the constraint conditions.

Description

Technical Field

[0001] This application relates to the field of steel rolling technology, and in particular to a method, system, air knife, and equipment for processing perforated plates using an air knife. Background Technology

[0002] Air knives are crucial equipment in hot-dip galvanizing production, significantly impacting product quality. In continuous hot-dip galvanizing lines, air knives use a pair of slit-shaped nozzles spanning the entire width of the strip to spray a continuous, knife-like flat airflow. This scrapes away excess molten zinc from the strip surface, leaving a uniform and appropriate zinc layer. Excess zinc flows back to the zinc bath, thus achieving precise control over the zinc layer. Higher air pressure results in stronger zinc scraping and a thinner zinc layer. Surface defects in hot-dip galvanized products are strongly correlated with the air knife's performance; therefore, the airflow must be highly stable and uniform to prevent surface defects.

[0003] The internal structure of existing air knives, such as Figures 1A-1B As shown, the air knife mainly consists of a cavity 1, adjusting bolts 2, a perforated plate 3, a lower blade lip 4, and an upper blade lip 5. The perforated plate 3 has evenly distributed round holes or other shaped mesh holes. Existing air knives have single-sided air intake, which results in slightly higher pressure on the side closer to the blower and slightly lower pressure on the side farther from the blower. Figure 2 As shown.

[0004] To ensure the symmetry and uniformity of the injected gas in the lateral direction, and to make the pressure and velocity of the injected gas more uniform in the lateral direction, i.e., the width direction of the blade lip exit, the air chamber is generally designed with double-sided air intake. However, double-sided air intake makes the air knife structure more complex. Moreover, the pressure of the double-sided air intake cannot be guaranteed to be completely consistent; there will still be a pressure difference depending on the distance from the blower. This pressure difference will be reflected in the final injected airflow, causing uneven coating thickness and other related defects on the strip steel.

[0005] Therefore, the problem with the existing technology is that the air knife blows unevenly, which causes surface defects in the strip steel. Summary of the Invention

[0006] This invention provides a method, system, air knife, and equipment for processing perforated plates using an air knife, to solve or partially solve the technical problem of surface defects in strip steel caused by uneven airflow from the air knife in the prior art.

[0007] To address the aforementioned technical problems, a first aspect of the present invention discloses a method for processing perforated plates used in air knives, the method comprising:

[0008] The existing mesh aperture and the distance between the existing mesh and the air inlet are obtained based on the structure of the existing mesh plate; wherein, the existing mesh plate has a plurality of existing mesh holes of equal size evenly distributed in it;

[0009] Based on the air knife parameters, the existing mesh aperture, and the distance between the existing mesh and the air inlet, the initial mesh aperture in the improved perforated plate is determined;

[0010] A finite element model is established, and the initial mesh aperture in the improved perforated plate is configured into the finite element model to obtain an improved perforated plate model with aperture increasing from small to large in the direction of the air inlet.

[0011] The pressure distribution of the airflow at the outlet of the first cutter lip in the air knife width direction of the improved perforated plate model is calculated using fluid simulation software. The initial mesh aperture is then corrected using the pressure distribution at the outlet of the first cutter lip and its constraints to obtain the corrected aperture in the improved perforated plate. The pressure distribution of the airflow at the outlet of the second cutter lip formed by the corrected aperture satisfies the constraints.

[0012] Preferably, a plurality of existing mesh holes in the existing mesh plate are evenly arranged in rows and columns; each existing mesh hole in a single column is equidistant from the air inlet.

[0013] Preferably, determining the initial mesh diameter in the improved perforated plate based on the air knife parameters, the existing mesh aperture, and the distance between the existing mesh and the air inlet specifically includes:

[0014] Substitute the air knife parameters, the existing mesh aperture, and the distance between the existing mesh and the air inlet into the formula. The initial mesh aperture is obtained; where i represents the mesh in different columns, n is the number of mesh columns, and r i Let r0 be the initial mesh aperture, r0 be the existing mesh aperture, and d be the current mesh aperture. i The distance between the existing mesh and the air inlet is denoted by w, where w is the width of the air knife lip, and x is the linear coefficient.

[0015] Preferably, the step of calculating the airflow pressure distribution at the first cutter lip outlet in the air knife width direction using fluid simulation software, and correcting the initial mesh aperture using the first cutter lip outlet airflow pressure distribution and its constraints to obtain the corrected aperture in the improved perforated plate specifically includes:

[0016] Based on the airflow pressure distribution at the first blade outlet, extract the first air pressure value P at the blade outlet in the air knife width direction, which satisfies the first distance threshold from the air inlet. j The second air pressure value P that meets the second distance threshold at the air inlet. y ;

[0017] Using the first air pressure value P j The second air pressure value P y The constraints are used to correct the initial mesh aperture to obtain the corrected aperture.

[0018] Preferably, the use of the first air pressure value P j The second air pressure value P y The constraints are used to correct the initial mesh aperture to obtain the corrected aperture, specifically including:

[0019] If P j P y If the aforementioned constraints are not met, determine P. j P y The size; the constraint condition is: |P j -P y | / P j <2%

[0020] If |P j -P y | / P j ≥2%, and P j ≥P y Increase the linear coefficient x to adjust the initial mesh aperture to obtain the corrected aperture.

[0021] If |P j -P y | / P j ≥2%, and P y ≥P j The initial mesh aperture is adjusted by reducing the linear coefficient x to obtain the corrected aperture.

[0022] Preferably, after redesigning the initial mesh aperture, the method further includes:

[0023] After each adjustment of the initial mesh aperture, the corresponding airflow pressure distribution at the third blade outlet is calculated using the fluid simulation software;

[0024] Use the aforementioned constraints to verify whether the airflow pressure distribution at the outlet of the third blade lip meets the conditions;

[0025] If satisfied, the mesh aperture that satisfies the aforementioned constraint condition will be determined as the corrected aperture.

[0026] If not satisfied, adjust again.

[0027] Preferably, after obtaining the corrected aperture in the improved perforated plate, the method further includes;

[0028] The improved perforated plate is obtained based on the modified aperture processing, so that the airflow pressure distribution at the outlet of the second cutter lip formed by the air knife equipped with the improved perforated plate satisfies the constraint condition.

[0029] A second aspect of the present invention discloses a perforated plate processing system for use with an air knife, comprising:

[0030] The acquisition module is used to acquire the existing mesh aperture of the existing mesh plate and the distance between the existing mesh and the air inlet based on the structure of the existing mesh plate; wherein, the existing mesh plate includes a plurality of existing mesh holes that are evenly distributed and of equal size;

[0031] The determination module is used to determine the initial mesh diameter in the improved perforated plate based on the air knife parameters, the existing mesh diameter, and the distance between the existing mesh and the air inlet.

[0032] The model building module is used to build a finite element model and configure the initial mesh aperture in the improved perforated plate into the finite element model to obtain an improved perforated plate model with aperture increasing from small to large in the direction of the air inlet.

[0033] The correction module is used to calculate the airflow pressure distribution at the first cutter lip outlet in the air knife width direction of the improved perforated plate model using fluid simulation software, and to correct the initial mesh aperture using the first cutter lip outlet airflow pressure distribution and its constraint conditions to obtain the corrected aperture in the improved perforated plate; wherein the airflow pressure distribution at the second cutter lip outlet formed by the corrected aperture satisfies the constraint conditions.

[0034] Preferably, a plurality of existing mesh holes in the existing mesh plate are evenly arranged in rows and columns; each existing mesh hole in a single column is equidistant from the air inlet.

[0035] Preferably, the correction module is specifically used for:

[0036] Substitute the air knife parameters, the existing mesh aperture, and the distance between the existing mesh and the air inlet into the formula. The initial mesh aperture is obtained; where i represents the mesh in different columns, n is the number of mesh columns, and r i Let r0 be the initial mesh aperture, r0 be the existing mesh aperture, and d be the current mesh aperture. i The distance between the existing mesh and the air inlet is denoted by w, where w is the width of the air knife lip, and x is the linear coefficient.

[0037] Preferably, the correction module is specifically used for:

[0038] Based on the airflow pressure distribution at the first blade outlet, extract the first air pressure value P at the blade outlet in the air knife width direction, which satisfies the first distance threshold from the air inlet. jThe second air pressure value P that meets the second distance threshold at the air inlet. y ;

[0039] Using the first air pressure value P j The second air pressure value P y The constraints are used to correct the initial mesh aperture to obtain the corrected aperture.

[0040] Preferably, the correction module is specifically used for:

[0041] The first air pressure value P is utilized j The second air pressure value P y The constraints are used to correct the initial mesh aperture to obtain the corrected aperture, specifically including:

[0042] If P j P y If the aforementioned constraints are not met, determine P. j P y The size; the constraint condition is: |P j -P y | / P j <2%

[0043] If |P j -P y | / P j ≥2%, and P j ≥P y Increase the linear coefficient x to adjust the initial mesh aperture to obtain the corrected aperture.

[0044] If |P j -P y | / P j ≥2%, and P y ≥P j The initial mesh aperture is adjusted by reducing the linear coefficient x to obtain the corrected aperture.

[0045] Preferably, the system further includes an adjustment module for:

[0046] After each adjustment of the initial mesh aperture, the corresponding airflow pressure distribution at the third blade outlet is calculated using the fluid simulation software;

[0047] Use the aforementioned constraints to verify whether the airflow pressure distribution at the outlet of the third blade lip meets the conditions;

[0048] If satisfied, the mesh aperture that satisfies the aforementioned constraint condition will be determined as the corrected aperture.

[0049] If not satisfied, adjust again.

[0050] Preferably, the system further includes a preparation module for;

[0051] The improved perforated plate is obtained based on the modified aperture processing, so that the airflow pressure distribution at the outlet of the second cutter lip formed by the air knife equipped with the improved perforated plate satisfies the constraint condition.

[0052] A third aspect of the present invention discloses an air knife comprising an improved perforated plate prepared using the aforementioned method.

[0053] A fourth aspect of the present invention discloses an apparatus comprising the air knife described above.

[0054] Through one or more technical solutions of the present invention, the present invention has the following beneficial effects or advantages:

[0055] This invention discloses a method, system, air knife, and equipment for processing perforated plates used in air knives. The method involves obtaining the existing mesh aperture and distance between the existing mesh and the air inlet based on the structure of the existing perforated plate. Then, an initial mesh aperture is determined for an improved perforated plate, and a finite element model is established. The initial mesh aperture is then incorporated into the finite element model to obtain an improved perforated plate model with apertures increasing from the air inlet direction. Fluid simulation software is used to calculate the airflow pressure distribution at the first blade lip outlet in the air knife width direction of the improved perforated plate model. The initial mesh aperture is then corrected using the first blade lip outlet airflow pressure distribution and its constraints to obtain the corrected aperture in the improved perforated plate. This technical solution only requires changing the perforated plate aperture without altering the air knife inlet method, making it simple to implement and low-cost. By optimizing the perforated plate aperture of the air knife, the flow field uniformity at the air knife blade lip outlet can be effectively improved, thereby reducing defects caused by uneven zinc layer thickness on the strip surface, improving the strip surface quality, and resulting in significant economic benefits.

[0056] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0057] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0058] Figures 1A-1BA prior art air knife structure according to an embodiment of the present invention is shown;

[0059] Figure 2 A schematic diagram of pressure distribution in the prior art according to an embodiment of the present invention is shown;

[0060] Figure 3 A flowchart of a perforated plate processing method applied to an air knife according to an embodiment of the present invention is shown;

[0061] Figure 4 A schematic diagram of the modified aperture arrangement in an improved perforated plate according to an embodiment of the present invention is shown.

[0062] Figure 5 A schematic diagram of a perforated plate processing system applied to an air knife according to an embodiment of the present invention is shown. Detailed Implementation

[0063] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0064] To address the surface defects in strip steel caused by uneven airflow from an air knife, the internal structure of existing air knives needs improvement to ensure more uniform gas pressure and velocity in the transverse direction, i.e., the width direction of the blade lip exit. However, existing technologies that simply change from single-sided to double-sided air intake do not fundamentally solve the problem. Therefore, this invention addresses this issue by modifying the perforated plate, changing the aperture size to improve airflow uniformity.

[0065] In this embodiment of the invention, a method for processing perforated plates applied to air knives is disclosed, see below. Figure 3 The method includes:

[0066] Step 101: Obtain the existing mesh aperture and the distance between the existing mesh and the air inlet based on the existing mesh structure.

[0067] Specifically, the existing perforated plate has a number of existing mesh holes of equal size evenly distributed in it. The number of existing mesh holes is not limited in this embodiment, and the existing mesh holes are specifically circular, polygonal, or irregularly shaped.

[0068] All existing mesh openings on the existing perforated plate are of the same size; therefore, measuring the diameter of any one existing mesh opening will give the diameter of all existing mesh openings. Furthermore, several existing mesh openings in the existing perforated plate are arranged in rows and columns, with each existing mesh opening in a single column equidistant from the air inlet. For example, Figure 1B The mesh has several rows, arranged from near to far from the air intake. Figure 1B (Arranged from left to right in the middle), in the second column, each mesh opening is equidistant from the air inlet. Therefore, the relative distance between each column of mesh openings and the air inlet is: d i (i = 1, 2, 3, ..., n, where n is the number of mesh columns).

[0069] Step 102: Determine the initial mesh diameter in the improved perforated plate based on the air knife parameters, the existing mesh aperture, and the distance between the existing mesh and the air inlet.

[0070] In this embodiment, the air knife parameters, existing mesh aperture, and distance between the existing mesh and the air inlet are substituted into the formula. The initial mesh aperture is obtained. Here, i represents the mesh in a different column, n is the number of mesh columns, and r... i r0 is the initial mesh aperture, r0 is the existing mesh aperture, and d i Let w be the distance between the existing mesh and the air inlet, w be the width of the air knife lip, and x be the linear coefficient. From the above formula, we can see that the initial mesh aperture size r... i The distance d between the existing mesh and the air inlet i Linear correlation. Therefore, by using the above formula to improve the aperture of each column of mesh in the existing perforated plate and its distance from the air inlet, the initial aperture of each column of mesh mapped onto the improved perforated plate can be obtained.

[0071] It is worth noting that in the improved perforated plate, the initial mesh diameter of each mesh in a single row is the same, and the distance between each mesh and the air inlet in a single row is equal. In addition, the mesh diameter in each row is arranged from small to large from the direction of the air inlet.

[0072] Step 103: Establish a finite element model and configure the initial mesh aperture in the improved perforated plate into the finite element model to obtain an improved perforated plate model with aperture increasing from small to large in the direction of the air inlet.

[0073] In this embodiment, the existing perforated plate is improved, and a perforated plate model is established with the aperture increasing from small to large in the direction of the air inlet.

[0074] Specifically, due to the initial mesh aperture size r i The distance d between the existing mesh and the air inlet iThe relationship is linear. Therefore, the further away from the air inlet, the larger the initial mesh aperture. Based on this, different aperture sizes are designed on the improved mesh plate, referencing the distance between the existing mesh and the air inlet. The aperture size is determined according to the aforementioned formula.

[0075] Step 104: Calculate the airflow pressure distribution at the outlet of the first cutter lip in the air knife width direction using fluid simulation software, and correct the initial mesh aperture using the airflow pressure distribution at the outlet of the first cutter lip and its constraints to obtain the corrected aperture in the improved mesh plate.

[0076] Specifically, in order to make the mesh aperture in the improved perforated plate meet the requirements of airflow uniformity in this embodiment, and to make the gas pressure and velocity ejected from the improved perforated plate more uniform in the lateral direction, i.e. the width direction of the blade lip outlet, this embodiment needs to use constraint conditions to correct the initial mesh aperture.

[0077] After obtaining the airflow pressure distribution at the first blade outlet, a first air pressure value P is extracted based on the first blade outlet airflow pressure distribution, which is the distance from the blade outlet in the air knife width direction to the air inlet that meets a first distance threshold (for example, the first distance threshold is the threshold closest to the air inlet). j The second air pressure value P that is at a distance from the air inlet that meets a second distance threshold (e.g., the second distance threshold is the threshold furthest from the air inlet). y Using the first air pressure value P j Second atmospheric pressure value P y The initial mesh aperture is corrected by constraints to obtain the corrected aperture.

[0078] See the schematic diagram of the modified aperture arrangement in the improved perforated plate. Figure 4 .

[0079] exist Figure 4 In this design, the corrected aperture of each mesh in a single row is the same, and the distance between each mesh and the air inlet in a single row is equal. Furthermore, the aperture diameter in each row is arranged from smallest to largest from the direction of the air inlet.

[0080] The constraint condition in this embodiment is: |P j -P y | / P j <2%. Therefore, we will determine P. j P y Does P satisfy the constraints? j P y If the constraints are met, an improved perforated plate can be prepared accordingly.

[0081] If P j P y If the constraints are not met, then further determine P. j Py The size is adjusted selectively based on the size. Specifically, if |P j -P y | / P j ≥2%, and P j ≥P y Increase the linear coefficient x to adjust the initial mesh aperture to obtain the corrected aperture, so that the airflow pressure distribution at the outlet of the second blade lip formed by the corrected aperture satisfies the constraint conditions. If |P j -P y | / P j ≥2%, and P y ≥P j The linear coefficient x is reduced to adjust the initial mesh aperture to obtain the corrected aperture, so that the pressure distribution of the airflow at the outlet of the second blade formed by the corrected aperture satisfies the constraint conditions.

[0082] Of course, adjusting the initial mesh aperture may require one or more adjustments. After each adjustment, under the same intake conditions, the pressure distribution at the cutter lip outlet is recalculated using fluid simulation software on the model with the optimized aperture size scheme. Based on the results, the aperture size is further optimized until it meets |P j -P y | / P j ≤2%.

[0083] Specifically, under the same inlet conditions, the corresponding airflow pressure distribution at the third cutter lip outlet was calculated using fluid simulation software. Specifically, after each adjustment of the initial mesh aperture, a finite element model was established, and the adjusted mesh aperture was incorporated into the finite element model to obtain an adjusted mesh plate model with apertures increasing from the inlet direction. The airflow pressure distribution at the third cutter lip outlet in the air knife width direction was then calculated using fluid simulation software.

[0084] Verify whether the airflow pressure distribution at the outlet of the third blade meets the constraints. If it does, determine the mesh aperture when the constraints are met as the corrected aperture. If it does not meet the constraints, adjust and execute the above process again until the airflow pressure distribution at the outlet of the third blade corresponding to the mesh aperture meets the constraints.

[0085] In some optional embodiments, after obtaining the modified aperture in the improved perforated plate, the improved perforated plate is machined based on the modified aperture to ensure that the airflow pressure distribution at the outlet of the second cutter lip formed by the air knife equipped with the improved perforated plate meets the constraint conditions. Since the improved perforated plate and the existing perforated plate can be applied to the same air knife, the existing perforated plate can be replaced by the machined improved perforated plate, thereby making the gas pressure and velocity ejected from the air knife more uniform in the transverse direction, i.e., in the width direction of the cutter lip outlet.

[0086] The above is a detailed description of the technical solution of this embodiment. This technical solution only requires changing the aperture of the perforated plate, without changing the air knife inlet method, making it simple to implement and low in cost. By optimizing the aperture of the perforated plate of the air knife, the uniformity of the flow field at the air knife lip exit can be effectively improved, thereby reducing defects caused by uneven zinc layer thickness on the strip surface, improving the surface quality of the strip, and resulting in significant economic benefits.

[0087] Based on the same inventive concept, the following embodiments describe a perforated plate processing system applied to an air knife. (See attached image.) Figure 5 ,include:

[0088] The acquisition module 501 is used to acquire the existing mesh aperture diameter of the existing mesh plate and the distance between the existing mesh and the air inlet according to the structure of the existing mesh plate; wherein, the existing mesh plate includes a plurality of existing mesh holes that are evenly distributed and of equal size;

[0089] The determination module 502 is used to determine the initial mesh diameter in the improved perforated plate based on the air knife parameters, the existing mesh diameter, and the distance between the existing mesh and the air inlet.

[0090] Model building module 503 is used to build a finite element model and configure the initial mesh aperture in the improved mesh plate into the finite element model to obtain an improved mesh plate model with aperture increasing from small to large in the direction of the air inlet.

[0091] The correction module 504 is used to calculate the airflow pressure distribution at the first cutter lip outlet in the air knife width direction of the improved perforated plate model using fluid simulation software, and to correct the initial mesh aperture using the first cutter lip outlet airflow pressure distribution and its constraint conditions to obtain the corrected aperture in the improved perforated plate; wherein the airflow pressure distribution at the second cutter lip outlet formed by the corrected aperture satisfies the constraint conditions.

[0092] Preferably, a plurality of existing mesh holes in the existing mesh plate are evenly arranged in rows and columns; each existing mesh hole in a single column is equidistant from the air inlet.

[0093] Preferably, the correction module 504 is specifically used for:

[0094] Substitute the air knife parameters, the existing mesh aperture, and the distance between the existing mesh and the air inlet into the formula. The initial mesh aperture is obtained; where i represents the mesh in different columns, n is the number of mesh columns, and r i Let r0 be the initial mesh aperture, r0 be the existing mesh aperture, and d be the current mesh aperture. i The distance between the existing mesh and the air inlet is denoted by w, where w is the width of the air knife lip, and x is the linear coefficient.

[0095] Preferably, the correction module 504 is specifically used for:

[0096] Based on the airflow pressure distribution at the first blade outlet, extract the first air pressure value P at the blade outlet in the air knife width direction, which satisfies the first distance threshold from the air inlet. j The second air pressure value P that meets the second distance threshold at the air inlet. y ;

[0097] Using the first air pressure value P j The second air pressure value P y The constraints are used to correct the initial mesh aperture to obtain the corrected aperture.

[0098] Preferably, the correction module 504 is specifically used for:

[0099] If P j P y If the aforementioned constraints are not met, determine P. j P y The size; the constraint condition is: |P j -P y | / P j <2%

[0100] If |P j -P y | / P j ≥2%, and P j ≥P y Increase the linear coefficient x to adjust the initial mesh aperture to obtain the corrected aperture.

[0101] If |P j -P y | / P j ≥2%, and P y ≥P j The initial mesh aperture is adjusted by reducing the linear coefficient x to obtain the corrected aperture.

[0102] Preferably, the system further includes an adjustment module for:

[0103] After each adjustment of the initial mesh aperture, the corresponding airflow pressure distribution at the third blade outlet is calculated using the fluid simulation software;

[0104] Use the aforementioned constraints to verify whether the airflow pressure distribution at the outlet of the third blade lip meets the conditions;

[0105] If satisfied, the mesh aperture that satisfies the aforementioned constraint condition will be determined as the corrected aperture.

[0106] If not satisfied, adjust again.

[0107] Preferably, the system further includes a preparation module for;

[0108] The improved perforated plate is obtained based on the modified aperture processing, so that the airflow pressure distribution at the outlet of the second cutter lip formed by the air knife equipped with the improved perforated plate satisfies the constraint condition.

[0109] Based on the same inventive concept, the following embodiments describe an air knife, including an improved perforated plate prepared using the aforementioned method. Specifically, the air knife in this embodiment can be a single-sided air knife or a double-sided air knife. Both single-sided and double-sided air knives can be configured with the improved perforated plate described in the foregoing embodiments.

[0110] The above is a detailed description of the embodiments of the present invention. Through the above-described measures, the pressure deviation at the blade lip outlet can be eliminated and the airflow uniformity at the blade lip outlet of the air knife can be improved. The above-described measures are only examples, and the present invention is not limited to the specific embodiments of the air knife structure described above in terms of shape and size.

[0111] Based on the same inventive concept, the following embodiments describe a device including the air knife described in the foregoing embodiments.

[0112] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages:

[0113] This invention discloses a method, system, air knife, and equipment for processing perforated plates used in air knives. The method involves obtaining the existing mesh aperture and distance between the existing mesh and the air inlet based on the structure of the existing perforated plate. Then, an initial mesh aperture is determined for an improved perforated plate, and a finite element model is established. The initial mesh aperture is then incorporated into the finite element model to obtain an improved perforated plate model with apertures increasing from the air inlet direction. Fluid simulation software is used to calculate the airflow pressure distribution at the first blade lip outlet in the air knife width direction of the improved perforated plate model. The initial mesh aperture is then corrected using the first blade lip outlet airflow pressure distribution and its constraints to obtain the corrected aperture in the improved perforated plate. This technical solution only requires changing the perforated plate aperture without altering the air knife inlet method, making it simple to implement and low-cost. By optimizing the perforated plate aperture of the air knife, the flow field uniformity at the air knife blade lip outlet can be effectively improved, thereby reducing defects caused by uneven zinc layer thickness on the strip surface, improving the strip surface quality, and resulting in significant economic benefits.

[0114] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

Claims

1. A method for processing perforated plates used in air knives, characterized in that, The method includes: The existing mesh aperture and the distance between the existing mesh and the air inlet are obtained based on the structure of the existing mesh plate; wherein, the existing mesh plate has a plurality of existing mesh holes of equal size evenly distributed in it; Based on the air knife parameters, the existing mesh aperture, and the distance between the existing mesh and the air inlet, the initial mesh aperture in the improved perforated plate is determined. Specifically, this includes substituting the air knife parameters, the existing mesh aperture, and the distance between the existing mesh and the air inlet into a formula. The initial mesh aperture is obtained; wherein, For meshes in different columns, The number of mesh columns, r i The initial mesh aperture is, r 0 represents the existing mesh aperture. d i The distance between the existing mesh and the air inlet. w The width of the air knife blade lip. x The coefficients are linear. A finite element model is established, and the initial mesh aperture in the improved perforated plate is configured into the finite element model to obtain an improved perforated plate model with aperture increasing from small to large in the direction of the air inlet. The improved perforated plate model is calculated using fluid simulation software to determine the airflow pressure distribution at the first cutter lip outlet in the air knife width direction. The initial mesh aperture is then corrected using this pressure distribution and its constraints to obtain the corrected aperture in the improved perforated plate. Specifically, this involves extracting a first air pressure value P at the cutter lip outlet in the air knife width direction, based on the first cutter lip outlet airflow pressure distribution, which satisfies a first distance threshold from the air inlet. j The second air pressure value P that meets the second distance threshold at the air inlet. y Using the first air pressure value P j The second air pressure value P y The constraints are used to correct the initial mesh aperture to obtain the corrected aperture; wherein, if P j P y If the aforementioned constraints are not met, determine P. j P y The size; the constraint condition is: |P j -P y | / P j <2%; if |P j -P y | / P j ≥2%, and P j ≥P y Increase the linear coefficient x to adjust the initial mesh aperture to obtain the corrected aperture; if |P j -P y | / P j ≥2%, and P y ≥P j The initial mesh aperture is adjusted by reducing the linear coefficient x to obtain the corrected aperture; the airflow pressure distribution at the second blade outlet formed by the corrected aperture satisfies the constraint condition.

2. The method as described in claim 1, characterized in that, The existing mesh in the existing mesh plate is evenly arranged in rows and columns; each existing mesh in a single column is equidistant from the air inlet.

3. The method as described in claim 1, characterized in that, The method further includes: After each adjustment of the initial mesh aperture, the corresponding airflow pressure distribution at the third blade outlet is calculated using the fluid simulation software; Use the aforementioned constraints to verify whether the airflow pressure distribution at the outlet of the third blade lip meets the conditions; If satisfied, the mesh aperture that satisfies the aforementioned constraint condition will be determined as the corrected aperture. If not satisfied, adjust again.

4. The method as described in claim 1, characterized in that, After obtaining the corrected aperture in the improved perforated plate, the method further includes: The improved perforated plate is obtained based on the modified aperture processing, so that the airflow pressure distribution at the outlet of the second cutter lip formed by the air knife equipped with the improved perforated plate satisfies the constraint condition.

5. A perforated plate processing system for use with air knives, characterized in that, include: The acquisition module is used to acquire the existing mesh aperture of the existing mesh plate and the distance between the existing mesh and the air inlet based on the structure of the existing mesh plate; wherein, the existing mesh plate includes a plurality of existing mesh holes that are evenly distributed and of equal size; The determination module is used to determine the initial mesh diameter in the improved perforated plate based on the air knife parameters, the existing mesh diameter, and the distance between the existing mesh and the air inlet. Specifically, it includes substituting the air knife parameters, the existing mesh diameter, and the distance between the existing mesh and the air inlet into the formula. The initial mesh aperture is obtained; wherein, For meshes in different columns, The number of mesh columns, r i The initial mesh aperture is, r 0 represents the existing mesh aperture. d i The distance between the existing mesh and the air inlet. w The width of the air knife blade lip. x The coefficients are linear. The model building module is used to build a finite element model and configure the initial mesh aperture in the improved perforated plate into the finite element model to obtain an improved perforated plate model with aperture increasing from small to large in the direction of the air inlet. The correction module is used to calculate the airflow pressure distribution at the first cutter lip outlet in the air knife width direction using fluid simulation software, and to correct the initial mesh aperture using the first cutter lip outlet airflow pressure distribution and its constraints, thereby obtaining the corrected aperture in the improved mesh plate. Specifically, it includes: extracting a first air pressure value P at the cutter lip outlet in the air knife width direction, which satisfies a first distance threshold from the air inlet, based on the first cutter lip outlet airflow pressure distribution. j The second air pressure value P that meets the second distance threshold at the air inlet. y Using the first air pressure value P j The second air pressure value P y The constraints are used to correct the initial mesh aperture to obtain the corrected aperture; wherein, if P j P y If the aforementioned constraints are not met, determine P. j P y The size; the constraint condition is: |P j -P y | / P j <2%; if |P j -P y | / P j ≥2%, and P j ≥P y Increase the linear coefficient x to adjust the initial mesh aperture to obtain the corrected aperture; if |P j -P y | / P j ≥2%, and P y ≥P j The initial mesh aperture is adjusted by reducing the linear coefficient x to obtain the corrected aperture; the airflow pressure distribution at the second blade outlet formed by the corrected aperture satisfies the constraint condition.

6. An air knife, characterized in that, This includes improved perforated plates prepared using the method described in any one of claims 1-4.

7. A device, characterized in that, Includes the air knife as described in claim 6.

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