Manufacturing and installation method for the transformation from a 24-sided shape to a circular shape of a large opening angle section of a stainless steel wind tunnel

Abstract

The present application provides a manufacturing and installation method for the 24-square-to-round transformation of the large-opening angle section of a stainless steel wind tunnel, which includes cutting the materials for 24 square plates and 24 arc plates; assembling four groups of square-to-round transformation segments, spot-welding each group of square-to-round transformation segments to a steel platform, and spot-welding the overlapping web segments to the outer peripheral wall at the upper end of the square-to-round transformation segments; completing the welding of the square-to-round transformation segments and removing the overlapping web segments after cooling; sequentially installing flanges, square-to-round transformation segments, square plates, and overlapping web segments on the large-opening angle section housing, completing the tack welding of the flanges and arc plates, and completing the tack welding of the overlapping web segments and square plates; completing the welding of the square-to-round transformation segments and square plates, installing anti-deformation components at the lower end face of the inner wall of the arc plates, completing the welding of the flanges and arc plates, removing the anti-deformation components and installing them at the upper end face of the inner wall of the square plates, completing the welding of the overlapping web segments and square plates, and welding the butt welds of adjacent overlapping web segments. This method improves the manufacturing efficiency of the 24-square-to-round transformation.

Description

Technical Field

[0001] This application relates to the field of wind tunnels, and particularly to a manufacturing and installation method for the 24-sided to circular transition in the large opening angle section of a stainless steel wind tunnel. Background Art

[0002] The operating temperature of the stainless steel wind tunnel is extremely low, close to -196°C. It adopts a double-layer shell structure. The internal sections such as the large opening angle section, the stabilization section, the contraction section, and the test section are installed inside the external pressure-bearing shell. The inner wall surface of the position in the pressure-bearing shell where there is no internal section is installed with a 24-sided bushing as the internal flow channel. The inlet section of the large opening angle section is circular, while the outlet section of the 24-sided bushing is a regular 24-sided polygon. Therefore, a 24-sided to circular transition is provided at the inlet of the large opening angle section to connect the internal flow channels of the 24-sided bushing and the large opening angle section.

[0003] The 24-sided to circular transition in the large opening angle section of the stainless steel wind tunnel consists of 24 arc plates, 24 square plates, flanges, 24 overlapping plates, and overlapping webs. The flanges are connected to the outer peripheral walls of the 24 arc plates, and the 24-sided to circular transition is installed on the large opening angle section by connecting with the flanges at the inlet of the large opening angle section. The overlapping webs are connected to the outer peripheral walls of the 24 square plates, and the overlapping plates are vertically connected to the overlapping webs and form an overlapping relationship with the 24-sided bushing to prevent air flow from backflowing.

[0004] The accuracy requirements for the 24-sided to circular transition are high, and there are the following difficulties in the manufacturing and installation process: First, there are a total of 48 welds in the square-to-round structure, and it is difficult to ensure the accuracy after welding. If press forming is used, the cost is high. Second, the thicknesses of the arc plates and square plates are very thin, and large concave deformations will occur in the 24-sided to circular transition structure after the installation and welding of the flanges and overlapping webs. Third, the overlapping accuracy requirements for the overlapping plates and the 24-sided bushing are high, and it is difficult to ensure the installation accuracy of the large opening angle section, the docking accuracy, and the overlapping accuracy between the 24-sided to circular transition and the 24-sided bushing simultaneously. Summary of the Invention

[0005] This application provides a manufacturing and installation method for the 24-sided to circular transition in the large opening angle section of a stainless steel wind tunnel, aiming to solve the problem of low manufacturing accuracy of the existing 24-sided to circular transition in the large opening angle section of the wind tunnel.

[0006] The technical solution of this application is as follows:

[0007] A manufacturing and installation method for the 24-sided to circular transition in the large opening angle section of a stainless steel wind tunnel includes the following steps:

[0008] S1, cut the 24 square plates respectively and prepare the bevels, and cut the 24 arc plates respectively and press them into shape;

[0009] S2. Draw the ground pattern of the transformation from a twenty-four-sided shape to a circular shape on the steel platform. Assemble four sets of the segment for the transformation from a square to a circle in sequence. Align the lower end of each set of the segment for the transformation from a square to a circle with the ground pattern and fix it to the steel platform by spot welding. Spot weld each set of the lapped web segments on the outer peripheral wall of the upper end of the corresponding set of the segment for the transformation from a square to a circle.

[0010] S3. Complete the welding of each set of the segment for the transformation from a square to a circle. After each set of the segment for the transformation from a square to a circle cools down to room temperature, remove the lapped web segments.

[0011] S4. Install the flange, four sets of the segment for the transformation from a square to a circle, four square plates, and four sets of the lapped web segments on the large-opening-angle section shell in sequence. Complete the tack welding between the flange and the arc plate. Complete the tack welding between the lapped web segments and the square plates.

[0012] S5. Complete the welding between the segment for the transformation from a square to a circle and the square plates. Install the anti-deformation component at the plane position where the lower end face of the inner wall of the arc plate is located. Complete the welding between the flange and the arc plate. Remove the anti-deformation component and install it at the plane position where the upper end face of the inner wall of the square plate is located. Complete the welding between the lapped web segments and the square plates. Finally, weld the butt welds between adjacent lapped web segments, and then complete the assembly welding of the transformation from a twenty-four-sided shape to a circular shape.

[0013] S6. Remove the anti-deformation component. Hoist the large-opening-angle section shell and the whole transformation from a twenty-four-sided shape to a circular shape to the upper position. Adjust the installation angle of the large-opening-angle section until it is qualified. Taking the outlet end face of the twenty-four-sided bushing as the reference, install twenty-four lapped plates in blocks and complete the welding between adjacent lapped plates.

[0014] As a technical solution of the present application, in step S1, after the twenty-four square plates are cut, prepare K-shaped grooves on both side ends of the outer contour of the square plates, and the groove angle is 45 - 50°.

[0015] As a technical solution of the present application, in step S2, each set of the segment for the transformation from a square to a circle includes six arc plates and five square plates. When each set of the segment for the transformation from a square to a circle is assembled, the lower end face of each arc plate faces down and fits with the steel platform, and the upper end face of each square plate faces up. The six arc plates are sequentially connected through adjacent lower corner ends, and each square plate is connected between two adjacent arc plates.

[0016] As a technical solution of the present application, in step S3, after the welding of each set of the segment for the transformation from a square to a circle, use a template to check the forming accuracy, and perform point pressing and straightening on the unqualified parts of the forming accuracy.

[0017] As a technical solution of the present application, in step S4, when installing the four square plates, the two side ends of the outer contour of the square plates are trimmed so that the edge center distances of the twenty-four square plates meet the design requirements.

[0018] As a technical solution of the present application, in step S5, the anti-deformation component includes a plurality of arc plates, a plurality of connecting plates and a plurality of wedge blocks; the plurality of arc plates are connected end to end in sequence, and the wedge blocks are inserted between the ends of two adjacent arc plates; bolt holes are formed at the ends of each arc plate, and both ends of the connecting block are connected to the bolt holes on two adjacent arc plates through bolts.

[0019] As a technical solution of the present application, in step S5, when installing the anti-deformation component, first install the plurality of arc plates on the inner peripheral wall of the twenty-four-square-to-round structure, then insert and hammer the wedge blocks between two adjacent arc plates, and finally place the connecting plate on the upper surfaces of the ends of two adjacent arc plates, and fasten the two adjacent arc plates by using the bolts and the connecting plate.

[0020] Advantages of the present application:

[0021] The present application provides a method for manufacturing and installing a twenty-four-square-to-round structure in a large-opening section of a stainless steel wind tunnel. By dividing the square-to-round structure into multiple segments for butt welding and then locally rectifying and finally assembling as a whole, it avoids manufacturing special molds for pressing forming, greatly reducing the manufacturing cost. At the same time, during the segmented welding process of the square-to-round structure, it is fixed by using the existing overlapping webs and steel platforms, effectively controlling the welding deformation and improving the forming accuracy; and during the installation process of the square-to-round structure, by finally trimming and installing four square plates, the overall installation accuracy of the twenty-four-square-to-round structure is greatly improved. In addition, during the welding process of the flange, overlapping web, arc plate and square plate, the anti-deformation component is installed, effectively controlling the concave deformation of the twenty-four-square-to-round structure and ensuring the final forming accuracy of the twenty-four-square-to-round structure. Secondly, after the large-opening section is hoisted in place, the overlapping plate is installed based on the outlet end face of the twenty-four-sided bushing, improving the docking accuracy and overlapping accuracy between the twenty-four-square-to-round structure and the twenty-four-sided bushing while ensuring the installation accuracy of the large-opening section. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the application,

[0023] and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 Schematic diagram of the structure of the 24-sided to round transformation provided by the embodiment of the present application;

[0025] Figure 2 Schematic diagram of the process of segmental assembly and welding of square to round transformation provided by the embodiment of the present application;

[0026] Figure 3 Schematic diagram of the first installation process of the 24-sided to round transformation provided by the embodiment of the present application;

[0027] Figure 4 Schematic diagram of the second installation process of the 24-sided to round transformation provided by the embodiment of the present application;

[0028] Figure 5 Schematic diagram of the third installation process of the 24-sided to round transformation provided by the embodiment of the present application;

[0029] Figure 6 Schematic diagram of the fourth installation process of the 24-sided to round transformation provided by the embodiment of the present application;

[0030] Figure 7 Schematic diagram of the structure of the anti-deformation component provided by the embodiment of the present application.

[0031] Icons: 1 - large opening angle section housing; 2 - arc plate; 3 - square plate; 4 - lapped plate; 5 - lapped web; 6 - flange; 7 - square to round transformation segment; 8 - steel platform; 9 - anti-deformation component; 10 - circular arc plate; 11 - wedge block; 12 - connecting plate; 13 - lapped web segment. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Usually, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the detailed description of the embodiments of the present application provided in the accompanying drawings below is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0034] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0036] In addition, in the present application, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being above, over, and on the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being below, under, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0037] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0038] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "arranged", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0039] Embodiment:

[0040] Please refer to Figure 1 , the opposite side distance of the square plate 3 in the transformation from twenty-four sides to a circle is 6850 mm, the opposite side distance of the overlapping plate 4 is 6910 mm, the thicknesses of the square plate 3, the arc plate 2, the overlapping plate 4, and the overlapping web 5 are 10 mm, and the material is austenitic stainless steel S30403.

[0041] As Figure 2As shown in the figure, twenty-four square plates 3 are cut to size and K-type grooves are prepared at both ends of the outer contour of each square plate 3, with a groove angle of 50°. Twenty-four arc plates 2 are cut to size and are formed by pressing using a hydraulic press. Draw the ground pattern of the transformation from square to circle on the steel platform 8, and sequentially assemble four sets of square-to-circle segments 7 composed of six adjacent arc plates 2 and five square plates 3. When each set of square-to-circle segments 7 is assembled, the lower end face of the arc plate 2 faces down and fits with the steel platform 8, and the upper end face of the square plate 3 faces up. The overlapping web 5 is sequentially divided into four identical overlapping web segments 13 and cut to size, and the overlapping web segments 13 are spot welded on the outer peripheral wall of the upper end of each set of square-to-circle segments 7. Each set of square-to-circle segments 7 is welded using tungsten inert gas welding. Before welding, the lower end of each set of square-to-circle segments 7 is aligned with the ground pattern and spot welded to the steel platform 8. After each set of square-to-circle segments 7 cools to room temperature, the overlapping web segments 13 are removed. After each set of square-to-circle segments 7 is welded, the forming accuracy is checked using a template, and the unqualified parts are corrected by spot pressing using a press until they are qualified.

[0042] As Figure 3 and Figure 4 shown, the flange 6 and four sets of square-to-circle segments 7 are sequentially installed on the large opening angle section shell 1. Adjust the installation positions of the four sets of square-to-circle segments 7 so that the central axes of the four sets of square-to-circle segments 7 coincide with the central axis of the large opening angle section shell 1 and ensure that the deviation of the edge center distance of the four sets of square-to-circle segments 7 is within 2 mm. Install the last four square plates 3. When installing, the two ends of the outer contour of the square plate 3 are trimmed to ensure that the deviation of the edge center distance of the twenty-four square plates 3 is within 2 mm. Install four overlapping web segments 13, complete the tack welding of the flange 6 and the arc plate 2, complete the tack welding of the overlapping web segments 13 and the square plate 3, and weld the square-to-circle segment 7 and the square plate 3 using tungsten inert gas welding.

[0043] As Figure 7 shown, the anti-deformation component 9 is composed of multiple arc plates 10, multiple connecting plates 12, and multiple wedge blocks 11. A bolt hole is provided at each end of each arc plate 10. The eight arc plates 10 are sequentially connected end to end to form a ring, and there is a gap between adjacent arc plates 10. The connecting plate 12 is a square plate, and a waist-shaped hole is provided at each end of each connecting plate 12. The connecting plate 12 is placed on the upper surface of the ends of two adjacent arc plates 10, and bolts are installed in the waist-shaped holes at both ends of the connecting plate 12 to fix the two adjacent arc plates 10, thereby connecting the eight arc plates 10 into a whole. In addition, the wedge block 11 is a trapezoidal steel block, which is inserted and tightened into the gap between two adjacent arc plates 10.

[0044] As Figure 5As shown in the figure, an anti-deformation component 9 is installed at the plane position of the lower end face of the inner wall of the arc plate 2: First, eight arc plates 10 are respectively installed on the inner peripheral wall of the 24-sided to circular transition. Then, wedges 11 are inserted between adjacent arc plates 10 and the wedges 11 are hammered with a sledgehammer to make the wedges 11 in a compacted state. Finally, the connecting plate 12 is placed on the upper surface of adjacent arc plates 10, and bolts are used to fasten the connecting plate 12 and adjacent arc plates 10. After the anti-deformation component 9 is installed, the welding of the flange 6 and the arc plate 2 is completed by flux-cored wire gas shielded welding.

[0045] As Figure 6 As shown in the figure, after the welding of the flange 6 and the arc plate 2 is completed, the anti-deformation component 9 is removed and installed at the plane position of the upper end face of the inner wall of the square plate 3. Wedges 11 are inserted into the gap between the inner wall surface of the 24-sided to circular transition and the outer wall surface of the arc plate 10. After the wedges 11 are inserted, two operators simultaneously hammer the wedges 11 in symmetric positions along the same circumferential direction with a sledgehammer to make them compacted. Then, the welding between the overlapping web segment 13 and the square plate 3 is completed by flux-cored wire gas shielded welding, and finally the butt welds between adjacent overlapping web segments 13 are welded.

[0046] The anti-deformation component 9 is removed, and the large opening angle section shell 1 and the 24-sided to circular transition are hoisted in place as a whole. The elevation and axis angle of the large opening angle section are adjusted until they are qualified, and it is ensured that the butt step difference between the arc plate 2 of the 24-sided to circular transition and the 24-sided bushing is within 2 mm. Taking the outlet end face of the 24-sided bushing as the reference, twenty-four overlapping plates 4 are installed in blocks. The positions of the twenty-four overlapping plates 4 are adjusted to ensure that the deviation of the opposite side distance is within 2 mm and the overlapping accuracy between the twenty-four overlapping plates 4 and the 24-sided bushing meets the requirements.

[0047] In summary, this method adopts a process of partial welding and local shaping and then general assembly after passing inspection. It solves the problems of high cost caused by the need to manufacture special molds in the pressing forming process and low accuracy caused by large rebound of thin plates. It develops a detachable anti-deformation component 9 with a simple structure and can be reused, which solves the problem of unqualified edge center distance caused by concave deformation during the welding process of the 24-sided to circular transition thin plate, effectively controls the concave deformation of the 24-sided to circular transition, and ensures the final forming accuracy of the 24-sided to circular transition. At the same time, this method also adopts a process of installing the overlapping plates 4 with the interface as the reference after the 24-sided to circular transition is installed qualified, which solves the problem that it is difficult to meet the requirements of the installation accuracy of the large opening angle section, the butt accuracy of the 24-sided to circular transition, and the overlapping accuracy at the same time. It improves the butt accuracy and overlapping accuracy between the 24-sided to circular transition and the 24-sided bushing while ensuring the installation accuracy of the large opening angle section.

[0048] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A method for manufacturing and installing a stainless steel wind tunnel with a large opening angle section that changes from 24 sides to rounded, characterized in that: The following steps are involved: S1, cutting and beveling the 24 square plates, and cutting and pressing the 24 curved plates; S2, draw twenty-four square-to-circular ground patterns on the steel platform, assemble four groups of square-to-circular segments in sequence, align the lower end of each group of square-to-circular segments with the ground pattern and fix them to the steel platform by spot welding, and spot weld each group of overlapping web segments to the outer peripheral wall of the upper end of each corresponding group of square-to-circular segments; each group of square-to-circular segments includes six arc plates and five square plates, and when each group of square-to-circular segments is assembled, the lower end of each arc plate faces downward and fits against the steel platform, and the upper end of each square plate faces upward, the six arc plates are connected in sequence through adjacent lower corner ends, and each square plate is connected between two adjacent arc plates; S3, completing the welding of each group of the square-to-round segments, and removing the overlapping web segments after each group of the square-to-round segments cools to room temperature; S4, sequentially installing a flange, four groups of the square-to-round segments, four square plates, and four groups of the overlapping web segments on the large-open-angle section shell, completing spot welding between the flange and the arc plate, and completing spot welding between the overlapping web segments and the square plates; S5, completing the welding of the square-to-round segment and the square plate, installing an anti-deformation assembly at the plane position where the lower end surface of the inner wall of the arc plate is located, completing the welding of the flange and the arc plate, removing the anti-deformation assembly and installing it at the plane position where the upper end surface of the inner wall of the square plate is located, completing the welding between the overlapping web segment and the square plate, and finally welding the butt welds between adjacent overlapping web segments, thereby completing the assembly welding of the twenty-four square-to-round segments; S6, remove the anti-deformation component, hoist the large open angle section shell and the twenty-four-sided rounded integral body into position, adjust the installation angle of the large open angle section until it is qualified, and install the twenty-four lap plates in blocks based on the outlet end face of the twenty-four-sided bushing and complete the welding between adjacent lap plates.

2. The manufacturing and installation method of the 24-square rounded stainless steel wind tunnel large-opening-angle section according to claim 1 is characterized in that: In step S1, after the twenty-four square plates are cut, K-shaped grooves are prepared on both sides of the outer contour of the square plates, and the groove angle is 45-50 degrees.

3. The manufacturing and installation method of the 24-square rounded stainless steel wind tunnel large-angle section according to claim 1 is characterized in that: In step S3, after each group of square-to-circle segmented welding is completed, a template is used to check the forming accuracy, and the parts with unqualified forming accuracy are subjected to point pressure correction.

4. The manufacturing and installation method of the 24-square rounded stainless steel wind tunnel large-opening-angle section according to claim 1 is characterized in that: In step S4, when the four square plates are installed, both side ends of the outer contours of the square plates are trimmed so that the edge-to-center distances of the twenty-four square plates meet the design requirements.

5. The manufacturing and installation method of the 24-square rounded stainless steel wind tunnel large-opening-angle section according to claim 1 is characterized in that: In step S5, the anti-deformation component includes multiple arc plates, multiple connecting plates and multiple wedge blocks; the multiple arc plates are connected end to end in sequence, and the wedge block is inserted between the ends of two adjacent arc plates; a bolt hole is opened on the end of each arc plate, and the two ends of the connecting block are respectively connected to the bolt holes on the two adjacent arc plates by bolts.

6. The method for manufacturing and installing the 24-square rounded stainless steel wind tunnel large-angle section according to claim 5 is characterized in that: In step S5, when installing the anti-deformation component, first install multiple arc plates on the inner circumferential wall of the twenty-four-sided rounded shape, then insert and hammer the wedge block between two adjacent arc plates, and finally place the connecting plate on the upper surface of the end of the two adjacent arc plates, and use the bolts and the connecting plate to fasten the two adjacent arc plates.

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