High-strength long-span oxidized conductive aluminum beam and preparation method thereof
By embedding ultra-high strength 7-Series aluminum alloy ferrule into the aluminum beam profile and performing optimization processing, the problems of insufficient strength and high cost of long-span alumina beams are solved, and the effects of high strength, low cost and high efficiency oxidation are achieved.
Patent Information
- Application Number
- CN202411689354.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-02-25
AI Technical Summary
The existing long-span alumina beams are prone to bending deformation due to insufficient strength and rigidity, and are costly, which limits their further development and application.
By embedding the ultra-high strength 7-Series aluminum alloy ferrule inside the traditional aluminum beam profile, and using extrusion, stretching, sawing and welding processes, long-span oxidized conductive aluminum beams with high strength and rigidity were prepared.
It significantly improves the strength and rigidity of aluminum beams, reduces material costs, avoids electrochemical corrosion, improves oxidation efficiency and conductive properties, and meets the needs of long-span applications.
Smart Images
Figure CN119507004A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of aluminum beam preparation, and in particular to a high-strength long-span oxidized conductive aluminum beam and a preparation method thereof. Background Art
[0002] Aluminum alloy materials are widely used in the manufacture of various structural parts due to their light weight and high strength. Among them, aluminum alloy anodized conductive beams are an important application of aluminum alloy profiles, mainly used for the conduction of anodizing tanks. Traditional aluminum alloy oxidation conductive beams are produced using 1 series or 6 series aluminum alloys. These aluminum alloys have good electrical conductivity and can meet the production and use needs of small and medium-sized oxidation tanks. However, due to the insufficient strength and rigidity of 1 series or 6 series aluminum alloys, bending and deformation are prone to occur during long-span use, which can often only be solved by heightening. However, heightening itself will increase the weight of the material and cause bending, and heightening will also increase the material cost and affect the height of the equipment design.
[0003] With the development of vertical oxidation of solar frame profiles, the demand for oxidation conductive beams is also increasing. In order to improve oxidation efficiency and reduce costs, the single-row span has reached more than 9 meters, and there are even 11-meter production lines. However, the current conductive beams are prone to bending and deformation during long-span use due to insufficient strength and rigidity. Although the existing heightening scheme can improve the strength of long-span oxidation aluminum beams to a certain extent, this method has some obvious problems. First, increasing the thickness or width of the aluminum beam will significantly increase the material cost, which is an important consideration for large-scale production. Secondly, due to the limited strength and rigidity of 1-series or 6-series aluminum alloys, even if their thickness or width is increased, the aluminum beam may still bend and deform during long-span use, which will affect the normal operation and life of the equipment.
[0004] Therefore, existing solutions still have the problems of insufficient strength and high cost, which limits their further development and application. Summary of the invention
[0005] The purpose of the present invention is to provide an oxidized conductive aluminum beam with high strength, low application cost and meeting the requirements of long-span applications, and a preparation method thereof, so as to at least provide a beneficial choice or create conditions for solving one or more technical problems existing in the prior art.
[0006] To achieve the above objectives, the present invention adopts the following technical solutions.
[0007] A method for preparing a high-strength, long-span, oxidized conductive aluminum beam, the preparation steps of which are as follows: 1) extruding to obtain an aluminum beam outer body, the aluminum beam outer body is a 1-series or 6-series aluminum alloy profile, the aluminum beam outer body has an inner cavity with an I-shaped or I-shaped cross section; 2) extruding to obtain an aluminum beam insert, the aluminum beam insert is a 7-series aluminum alloy, the tensile strength of the aluminum beam insert is greater than 500MPa, the yield strength is greater than 400MPa, and the shape of the aluminum beam insert is consistent with the shape of the inner cavity; 3) plugging, The aluminum beam insert obtained by extrusion is inserted into the corresponding inner cavity of the aluminum beam outer body obtained by extrusion in step 1) to obtain a prefabricated aluminum beam; 4) Stretching, the prefabricated aluminum beam obtained in step 3) is sent to a stretching machine for stretching, and the stretching amount is 5%-10%; 5) Sawing, the aluminum beam stretched in step 4) is transferred to a sawing machine for sawing, and the sawing amount is 0.4-0.6 meters at both ends; 6) End sealing, after sawing, an aluminum plate of the same material as the aluminum beam outer body is fully welded to the end of the aluminum beam to obtain a high-strength long-span oxidized conductive aluminum beam.
[0008] More preferably, the outer body of the aluminum beam is a 1060 aluminum profile or a 6063 aluminum profile.
[0009] More preferably, the same aluminum beam outer body has at least two inner cavities, and the inner cavities are arranged in parallel.
[0010] More preferably, the shapes of the inner cavities are the same or different.
[0011] More preferably, the inner cavity is located in the middle area of the outer body of the aluminum beam.
[0012] More preferably, the aluminum beam insert is a 7075 aluminum alloy profile.
[0013] More preferably, the cross-section of the outer body of the aluminum beam is a square with a side length of 200±20mm, and the four corners of the square have chamfers of 10±2mm respectively; the aluminum beam body has two I-shaped inner cavities arranged side by side, and the width of the cross-section of each I-shaped inner cavity is 5-6mm and the height is 100-120mm; the width of the aluminum beam core is 0.5-1.0mm smaller than the width of the inner cavity, and the height of the aluminum beam core is 0.5-1.0mm smaller than the height of the inner cavity.
[0014] More preferably, the cross-section of the outer body of the aluminum beam is a square with a side length of 200±20mm, and the four corners of the square have chamfers of 10±2mm respectively; the aluminum beam body has an I-shaped inner cavity arranged side by side, the width of the I-shaped inner cavity at both ends is 35-50mm, the width in the middle is 5-10mm, the height is 130-150mm, and the height in the middle is 110-140mm; the width of the aluminum beam core at both ends is 0.5-1.0mm smaller than the width of the inner cavity at both ends, the width in the middle of the aluminum beam core is 0.5-1.0mm smaller than the width in the middle of the inner cavity, the height of the aluminum beam core is 0.5-1.0mm smaller than the height of the inner cavity, and the height in the middle of the aluminum beam core is 0.5-1.0mm smaller than the height of the inner cavity.
[0015] More preferably, the length of the aluminum beam body is greater than 9 meters, and the length of the aluminum beam core is not less than the length of the aluminum beam body.
[0016] On the other hand, the present invention also provides a high-strength long-span oxidized conductive aluminum beam, which is prepared by the preparation method of the high-strength long-span oxidized conductive aluminum beam as described above.
[0017] Compared with the prior art, the present invention mainly solves the following technical problems.
[0018] 1) Solve the problem of insufficient strength of existing long-span anodized aluminum beams. Due to the insufficient strength and rigidity of 1-series or 6-series aluminum alloys, existing long-span anodized aluminum beams are prone to bending and deformation during actual use, which will affect the normal operation and life of the equipment. The present invention changes the structural design of traditional aluminum beam profiles and embeds ultra-high-strength 7-series aluminum alloys inside, greatly enhancing the strength and rigidity of the aluminum beam itself, thereby effectively solving this problem.
[0019] 2) The problem of high cost of existing long-span anodized aluminum beams is solved. The existing solution is mainly to increase the thickness or width of the aluminum beam to improve its strength, but this will also lead to an increase in material costs. The present invention optimizes the structural design of the aluminum beam, which not only improves the strength of the aluminum beam but also avoids increasing material costs, thereby effectively solving this problem.
[0020] 3) Solve the problem of conductivity loss in existing long-span alumina beams. Since 1-series or 6-series aluminum alloys have good conductivity but insufficient strength and rigidity, they tend to use higher-strength 6-series aluminum alloys. However, increased strength leads to decreased conductivity, and thickening or heightening the aluminum beam will also increase the conduction area and resistance. Existing long-span alumina beams may lose conductivity during actual use. The present invention reduces the loss of conductivity by mainly using the external high-conductivity 1-series or 6-series aluminum beam outer body for conduction, thereby effectively solving this problem.
[0021] 4) Solve the problem of electrochemical corrosion in existing long-span aluminum beams. Since different metals may have obvious electrochemical corrosion, if different metals such as steel are used to strengthen the aluminum beam, electrochemical corrosion may occur. The present invention effectively solves this problem by using aluminum alloy to avoid obvious electrochemical corrosion between different metals.
[0022] Compared with the prior art, the present invention has at least the following advantages and beneficial effects.
[0023] 1. Improved strength and rigidity: The present invention significantly enhances the strength and rigidity of the aluminum beam itself by embedding ultra-high strength 7 series aluminum alloy inside the traditional aluminum beam profile. This makes the use of long-span aluminum beams feasible while basically maintaining the original aluminum beam's electrical conductivity and not causing energy waste. This innovative design effectively solves the problem of bending and deformation in the prior art due to the lack of strength and rigidity of aluminum alloys during long-span use.
[0024] Second, reduce material costs: The processing method of the present invention first extrude and produce 1 series or 6 series aluminum profiles with I-shaped or I-shaped inner cavity structures, and ultra-high strength 7 series aluminum alloy profiles with corresponding inner cavity specifications reduced by 0.5-1mm. This design not only improves the strength and rigidity of the aluminum beam, but also avoids excessive increase in material thickness or width, thereby reducing material costs. This has important economic significance for large-scale production.
[0025] 3. Avoid electrochemical corrosion: The aluminum alloy of the present invention is mainly used to avoid obvious electrochemical corrosion between different metals. At the same time, the design of all-aluminum alloy also avoids obvious electrochemical corrosion between dissimilar metals, and is convenient for sawing. The end closure can also effectively avoid the problem of secondary corrosion of the material. This design effectively solves the problem of electrochemical corrosion that may occur between dissimilar metals in the prior art and improves the service life of the material.
[0026] 4. Improve oxidation efficiency and reduce costs: The design of the present invention is to meet the development needs of vertical oxidation of solar frame profiles, improve oxidation efficiency and reduce costs. By changing the structural design of traditional aluminum beam profiles, the structural strength of the original aluminum beam can be greatly improved, making the use of long-span aluminum beams feasible, thereby improving oxidation efficiency and reducing production costs.
[0027] In general, compared with the prior art, the present invention not only has significant improvements in strength and rigidity, but also has significant advantages in material cost, electrochemical corrosion and oxidation efficiency, etc. This invention provides new ideas and methods for the design and production of long-span aluminum beams and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 Shown is a schematic structural diagram of a 1060 aluminum profile with an I-shaped inner cavity in Example 1 of the present invention.
[0029] Figure 2 Shown is a schematic structural diagram of an I-shaped 7075 aluminum alloy profile in Example 1 of the present invention.
[0030] Figure 3 Shown is a schematic structural diagram of a 1060 aluminum profile with an I-shaped inner cavity in Example 3 of the present invention.
[0031] Figure 4 Shown is a schematic structural diagram of an I-shaped 7075 aluminum alloy profile in Example 3 of the present invention. DETAILED DESCRIPTION
[0032] The specific implementation of the present invention is further described below to make the technical solution and beneficial effects of the present invention clearer and more specific. The following embodiments are exemplary and intended to explain the present invention, but cannot be construed as limiting the present invention.
[0033] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention.
[0034] A high-strength, long-span, oxidized conductive aluminum beam changes the structural design of traditional aluminum beam profiles, embeds ultra-high-strength 7-series aluminum alloy inside the conductive aluminum beam, and thus greatly enhances the strength and rigidity of the conductive aluminum beam itself, thereby effectively solving the problem of insufficient strength of the long-span oxidized aluminum beam. At the same time, since the external high-conductivity 1-series or 6-series aluminum beam outer body is mainly used for conduction, the loss of conductive performance is small, solving the problem of conductive performance loss of the long-span oxidized aluminum beam. In addition, since the aluminum beam outer body and the internal insert are both made of aluminum alloy, obvious electrochemical corrosion between different metals can be avoided, thereby effectively solving the problem of electrochemical corrosion that may occur in the long-span oxidized aluminum beam. In particular, combined with the end closure, the directly exposed 7-series aluminum alloy inner beam is prevented from corrosion in the air, and the ingress of external corrosive air into the incompletely filled inner cavity structure is also avoided, thereby effectively solving the problem of secondary corrosion that may occur in the long-span oxidized aluminum beam.
[0035] The present invention can greatly improve the structural strength of the original aluminum beam through different inner cavity structure designs, making the use of long-span aluminum beams feasible, while basically maintaining the original aluminum beam's electrical conductivity and not causing energy waste. In addition, the all-aluminum alloy design will not cause obvious electrochemical corrosion between dissimilar metals, and is convenient for sawing. The end closure can also effectively avoid the problem of secondary corrosion of the material. Example 1.
[0036] A high-strength long-span oxidized conductive aluminum beam is prepared in the following steps.
[0037] 1) A 1060 aluminum profile A with an I-shaped inner cavity is obtained by extrusion production. The length of the 1060 aluminum profile is 10.2 meters, and the cross section is a square with a side length of 200 mm. The four corners of the square have a chamfer of 10 mm respectively. There are two I-shaped inner cavities arranged side by side, and the width W of the cross section of each I-shaped inner cavity is 6 mm, and the height L is 120 mm; Figure 1 shown.
[0038] 2) Extrusion to obtain I-shaped 7075 aluminum alloy profile B, such as Figure 2 As shown in the figure, the I-shaped 7075 aluminum alloy profile has a width of 5.5 mm, a height of 119 mm, and a length of 10.2 meters.
[0039] 3) Insert the I-shaped 7075 aluminum alloy profile obtained by extrusion in step 2) into the corresponding I-shaped inner cavity of the 1060 aluminum profile obtained by extrusion in step 1) to obtain a prefabricated aluminum beam.
[0040] 4) The prefabricated aluminum beam obtained in step 3) is sent to a stretching machine for stretching with a stretching amount of 10%.
[0041] 5) The stretched aluminum beam is transferred to the sawing machine for sawing, and the ends are clamped and 0.6 meters at each end are sawed off.
[0042] 6) After sawing, the prepared 1060 alloy aluminum plate is fully welded to the end of the aluminum beam to obtain a finished conductive aluminum beam 1.
[0043] After actual testing, the finished conductive aluminum beam 1 has a length of 10 meters and can bear a load of 3 tons without bending or deformation, thus meeting the application requirements of long-span oxidized conductive aluminum beams. Example 2.
[0044] A high-strength long-span oxidized conductive aluminum beam is prepared in the following steps.
[0045] 1) A 6063 aluminum profile with an I-shaped inner cavity is obtained by extrusion production. The length of the 6063 aluminum profile is 12.2 meters, and the cross section is a square with a side length of 200 mm. The four corners of the square have a chamfer of 10 mm respectively; there are two I-shaped inner cavities arranged side by side, and the width of the cross section of each I-shaped inner cavity is 5 mm and the height is 100 mm.
[0046] 2) An I-shaped 7075 aluminum alloy profile is obtained by extrusion. The width of the I-shaped 7075 aluminum alloy profile is 4.5 mm, the height is 99 mm, and the length is 12.2 meters.
[0047] 3) Insert the I-shaped 7075 aluminum alloy profile obtained by extrusion in step 2) into the corresponding I-shaped inner cavity of the 6063 aluminum profile obtained by extrusion in step 1) to obtain a prefabricated aluminum beam.
[0048] 4) The prefabricated aluminum beam obtained in step 3) is sent to a stretching machine for stretching with a stretching amount of 5%.
[0049] 5) After stretching, the aluminum beam is transferred to the sawing machine for sawing, and the ends are clamped and 0.4 meters at each end are sawed off.
[0050] 6) After sawing, the prepared 6063 alloy aluminum plate is fully welded to the end of the aluminum beam to obtain a finished conductive aluminum beam 2.
[0051] After actual testing, the finished conductive aluminum beam 2 has a length of 12 meters and can bear a load of 4 tons without bending or deformation, thus meeting the application requirements of long-span oxidized conductive aluminum beams. Example 3.
[0052] A high-strength long-span oxidized conductive aluminum beam is prepared in the following steps.
[0053] 1) A 1060 aluminum profile A with an I-shaped inner cavity is obtained by extrusion production. The length of the 1060 aluminum profile is 10.2 meters, and the cross section is a square with a side length of 200 mm. The four corners of the square have a chamfer of 10 mm respectively; an I-shaped inner cavity is used inside, and the width w1 of the I-shaped inner cavity at both ends is 35 mm, the width w2 in the middle is 5 mm, the height L1 is 150 mm, and the height L2 in the middle is 140 mm; Figure 3 shown.
[0054] 2) Extrusion to obtain I-shaped 7075 aluminum alloy profile B, such as Figure 4 As shown; the width of the I-shaped 7075 aluminum alloy profile at both ends is 34.5mm, the width in the middle is 4.5mm, the height L1 is 149mm, the middle height L2 is 139.5mm, and the length is 10.2 meters.
[0055] 3) Insert the I-shaped 7075 aluminum alloy profile obtained by extrusion in step 2) into the corresponding I-shaped inner cavity of the 1060 aluminum profile obtained by extrusion in step 1) to obtain a prefabricated aluminum beam.
[0056] 4) The prefabricated aluminum beam obtained in step 3) is sent to a stretching machine for stretching with a stretching amount of 10%.
[0057] 5) After stretching, the aluminum beam is transferred to the sawing machine for sawing, and the ends are clamped and 0.6 meters at each end are sawed off.
[0058] 6) After sawing, the prepared 1060 alloy aluminum plate is fully welded to the end of the aluminum beam to obtain a finished conductive aluminum beam 3.
[0059] After actual testing, the finished conductive aluminum beam 3 has a length of 10 meters and a load-bearing capacity of 3.5 tons without bending or deformation, thus meeting the application requirements of long-span oxidized conductive aluminum beams. Example 4.
[0060] A high-strength long-span oxidized conductive aluminum beam is prepared in the following steps.
[0061] 1) A 6063 aluminum profile with an I-shaped inner cavity is obtained by extrusion production. The length of the 6063 aluminum profile is 12.2 meters, and the cross section is a square with a side length of 200 mm. The four corners of the square have a chamfer of 10 mm respectively; an I-shaped inner cavity is used inside, and the width w1 of the I-shaped inner cavity at both ends is 50 mm, the width w2 in the middle is 10 mm, the height L1 is 130 mm, and the height L2 in the middle is 110 mm.
[0062] 2) Extrusion obtains an I-shaped 7075 aluminum alloy profile; the width of both ends of the I-shaped 7075 aluminum alloy profile is 49.5 mm, the width in the middle is 9.5 mm, the height L1 is 129 mm, the height L2 in the middle is 109.5 mm, and the length is 12.2 meters.
[0063] 3) Insert the I-shaped 7075 aluminum alloy profile obtained by extrusion in step 2) into the corresponding I-shaped inner cavity of the 6063 aluminum profile obtained by extrusion in step 1) to obtain a prefabricated aluminum beam.
[0064] 4) The prefabricated aluminum beam obtained in step 3) is sent to a stretching machine for stretching with a stretching amount of 5%.
[0065] 5) After stretching, the aluminum beam is transferred to the sawing machine for sawing, and the ends are clamped and 0.4 meters at each end are sawed off.
[0066] 6) After sawing, the prepared 6063 alloy aluminum plate is fully welded to the end of the aluminum beam to obtain a finished conductive aluminum beam 4.
[0067] After actual testing, the finished conductive aluminum beam 4 has a length of 12 meters and a load-bearing capacity of 4.5 tons without bending or deformation, thus meeting the application requirements of long-span oxidized conductive aluminum beams.
[0068] It should be noted that the technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0069] The above embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. The parts not described in the specific embodiments are all prior art or common knowledge.
[0070] It should be noted that, in the description of the present invention, the content of the present invention can be more easily understood by referring to the detailed description of the preferred implementation method of the present invention above and the embodiments included. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those of ordinary skill in the art to which the present invention belongs. When there is a conflict, the definitions in this specification shall prevail.
[0071] In the present invention, the term "prepared from..." is used synonymously with "comprising". The terms "comprising", "including", "having", "containing" or any other variation thereof, as used in the present invention, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus comprising the listed elements is not necessarily limited to only those elements, but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
[0072] In addition, the indefinite articles "a" and "an" before the elements or components of the present invention have no restrictions on the quantity requirements (i.e. the number of occurrences) of the elements or components. Therefore, "a" or "an" should be interpreted as including one or at least one, and the elements or components in the singular form also include the plural form, unless the number is obviously intended to be in the singular form.
Claims
1. A method for preparing a high-strength, long-span, oxidized conductive aluminum beam, characterized in that: The preparation steps are as follows: 1) Extruding an aluminum beam outer body, wherein the aluminum beam outer body is a 1 series or 6 series aluminum alloy profile, and the aluminum beam outer body has an inner cavity with an I-shaped or I-shaped cross section; 2) Extruding an aluminum beam insert, wherein the aluminum beam insert is a 7 series aluminum alloy, the tensile strength of the aluminum beam insert is greater than 500 MPa, the yield strength is greater than 400 MPa, and the shape of the aluminum beam insert is consistent with the shape of the inner cavity; 3) Insertion, inserting the aluminum beam core obtained by extrusion in step 2) into the corresponding inner cavity of the aluminum beam outer body obtained by extrusion in step 1) to obtain a prefabricated aluminum beam; 4) Stretching: the prefabricated aluminum beam obtained in step 3) is sent to a stretching machine for stretching, with a stretching amount of 5%-10%; 5) Sawing: the aluminum beam stretched in step 4) is transferred to a sawing machine for sawing, and the sawing amount is 0.4-0.6 meters at each end; 6) End sealing: After sawing, an aluminum plate made of the same material as the outer body of the aluminum beam is fully welded to the end of the aluminum beam to obtain a high-strength, long-span, oxidized conductive aluminum beam.
2. The method for preparing a high-strength long-span oxidized conductive aluminum beam according to claim 1, characterized in that: The outer body of the aluminum beam is 1060 aluminum profile or 6063 aluminum profile.
3. The method for preparing a high-strength long-span oxidized conductive aluminum beam according to claim 1, characterized in that: The same aluminum beam outer body is provided with at least two inner cavities, and the inner cavities are arranged in parallel.
4. The method for preparing a high-strength long-span oxidized conductive aluminum beam according to claim 3, characterized in that: The shapes of the inner cavities are the same or different.
5. The method for preparing a high-strength long-span oxidized conductive aluminum beam according to claim 1, characterized in that: The inner cavity is located in the middle area of the outer body of the aluminum beam.
6. The method for preparing a high-strength long-span oxidized conductive aluminum beam according to claim 1, characterized in that: The aluminum beam insert is a 7075 aluminum alloy profile.
7. The method for preparing a high-strength long-span oxidized conductive aluminum beam according to claim 1, characterized in that: The cross section of the aluminum beam outer body is a square with a side length of 200±20mm, and the four corners of the square have chamfers of 10±2mm respectively; the aluminum beam body has two I-shaped inner cavities arranged side by side, and the width of the cross section of each I-shaped inner cavity is 5-6mm and the height is 100-120mm; The width of the aluminum beam insert is 0.5-1.0 mm smaller than the width of the inner cavity, and the height of the aluminum beam insert is 0.5-1.0 mm smaller than the height of the inner cavity.
8. The method for preparing a high-strength long-span oxidized conductive aluminum beam according to claim 1, characterized in that: The cross section of the aluminum beam outer body is a square with a side length of 200±20mm, and the four corners of the square have chamfers of 10±2mm respectively; the aluminum beam body has an I-shaped inner cavity arranged side by side, and the width of the two ends of the I-shaped inner cavity is 35-50mm, the width of the middle part is 5-10mm, the height is 130-150mm, and the height of the middle part is 110-140mm; The widths at both ends of the aluminum beam core are 0.5-1.0 mm smaller than the widths at both ends of the inner cavity, the width in the middle of the aluminum beam core is 0.5-1.0 mm smaller than the width in the middle of the inner cavity, the height of the aluminum beam core is 0.5-1.0 mm smaller than the height of the inner cavity, and the middle height of the aluminum beam core is 0.5-1.0 mm smaller than the middle height of the inner cavity.
9. The method for preparing a high-strength long-span oxidized conductive aluminum beam according to claim 1, characterized in that: The length of the aluminum beam body is greater than 9 meters, and the length of the aluminum beam core is not less than the length of the aluminum beam body.
10. A high-strength, long-span, oxidized conductive aluminum beam, characterized in that: The high-strength long-span oxidized conductive aluminum beam is prepared by the preparation method of any one of claims 1 to 9.