A manufacturing method for a manhole door of a wind tunnel settling chamber

Abstract

The present application provides a manufacturing method for a manhole door of a wind tunnel settling chamber, including: selecting a steel plate with the same thickness as the fairing plate and rolling it, so that the curvature of the rolled steel plate is consistent with the curvature of the settling chamber shell; drawing a plurality of fairing plate outer contour lines on the inner arc surface of the steel plate, and taking the center points of the fairing plate outer contour lines as the reference, assembling a plurality of cylinders corresponding to the fairing plate outer contour lines one by one on the outer arc surface of the steel plate; welding the cylinders to the steel plate; cutting along the fairing plate outer contour lines; welding a plurality of circular plates on the settling chamber shell, installing the whole of the fairing plate and the cylinders in the settling chamber shell, and taking the end faces of the circular plates as the reference to repair and match the corresponding cylinder end faces until the end faces of the circular plates and the corresponding cylinder end faces are coplanar; disassembling the plurality of fairing plates and cylinders, and welding them to the circular cover plates respectively, installing the fairing plates, cylinders, and circular cover plates on the settling chamber shell, and connecting them to the corresponding circular plates by bolts respectively. This method greatly improves the manufacturing efficiency of the manhole door of the settling chamber.

Description

Technical Field

[0001] The present application relates to the field of wind tunnels, and particularly to a manufacturing method for a manhole door of a wind tunnel settling chamber. Background Art

[0002] The settling chamber is a large-sized constant cross-section duct located in front of the contraction section, with multiple layers of damping nets installed inside to improve the uniformity of the air flow and reduce its turbulence intensity. Manhole doors are installed at the front and rear positions between the damping nets in the settling chamber for inspecting the state of the damping nets before and after wind tunnel tests.

[0003] The inner wall surface of the settling chamber is an air flow profile. The manhole door cannot adopt the conventional structure of a connecting pipe + flanges + flange cover in design. It mainly consists of a fairing plate, a cylinder, a circular cover plate, and a circular plate. The fairing plate is an arc plate with the same curvature as the shell of the settling chamber; the cylinder is an annular web, connected to the outer wall surface of the fairing plate at one end and to the circular cover plate at the other end; the circular plate and the circular cover plate are circular ring plates. The circular plate is connected to the outer wall surface of the settling chamber, and the circular cover plate is bolted to the circular plate to install the manhole door. After the manhole door is installed, the fairing plate and the inner wall surface of the settling chamber together form an air flow profile.

[0004] The existing manufacturing process for the manhole door of the settling chamber is as follows: a margin is reserved in the thickness of the fairing plate, and after blanking, it is pressed into shape, and then assembled and welded with the cylinder and the circular cover plate. After welding, the inner wall surface of the fairing plate is machined. This process can ensure the accuracy of the inner wall surface of the fairing plate, but the construction cost is high, the construction period is long, and at the same time, the thickness margin of the fairing plate is determined by manual experience, and it is easy to form a step difference between the fairing plate and the inner wall surface of the settling chamber after installation. Summary of the Invention

[0005] The present application provides a manufacturing method for a manhole door of a wind tunnel settling chamber, aiming to solve the problem of low manufacturing efficiency of the existing manhole door of the wind tunnel settling chamber.

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

[0007] A manufacturing method for a manhole door of a wind tunnel settling chamber includes the following steps:

[0008] S1, select a steel plate with the same thickness as the fairing plate and roll it, and after rolling, the curvature of the steel plate is consistent with the curvature of the shell of the wind tunnel settling chamber;

[0009] S2, draw a plurality of spaced-apart outer contour lines of the fairing plate on the inner arc surface of the steel plate, and based on the center point of each outer contour line of the fairing plate, assemble a plurality of corresponding cylinders on the outer arc surface of the steel plate, and the cylinders correspond to the outer contour lines of the fairing plate one by one;

[0010] S3, weld the cylinders to the steel plate, and perform stress relief heat treatment on the cylinders and the steel plate;

[0011] S4. Use a grinding wheel to cut along the outer contour lines of each of the rectifier plates respectively to obtain a plurality of rectifier plates and cylinders connected together;

[0012] S5. Weld a plurality of circular plates to the stable section housing respectively, and install the plurality of connected rectifier plates and the cylinders in the stable section housing; with the end face of the circular plate as a reference, machine the end face of the corresponding cylinder until the end face of the circular plate and the end face of the corresponding cylinder are coplanar;

[0013] S6. Disassemble the plurality of connected rectifier plates and the cylinders, weld the single rectifier plates and the cylinders to the corresponding circular cover plates respectively, and finally install the connected rectifier plates, the cylinders and the circular cover plates on the stable section housing respectively, and bolt the circular cover plates to the corresponding circular plates.

[0014] As a technical solution of the present application, in step S2, the minimum distance between the outer contour of the steel plate and the outer contour line of any one rectifier plate is greater than 200 mm, and the minimum distance between adjacent rectifier plate outer contour lines is greater than 200 mm.

[0015] As a technical solution of the present application, in step S2, a margin of 5 - 8 mm is reserved in the width direction of the cylinder.

[0016] As a technical solution of the present application, in step S2, the center line of the cylinder coincides with the center point of the outer contour line of the corresponding rectifier plate.

[0017] As a technical solution of the present application, in step S3, before welding the cylinder and the steel plate, a plurality of longitudinal rib plates and transverse rib plates are spot - welded on the inner arc surface of the steel plate, and the longitudinal rib plates and the transverse rib plates are removed after the overall heat treatment of the cylinder and the steel plate.

[0018] As a technical solution of the present application, in step S5, when the plurality of connected rectifier plates and the cylinders are installed in the stable section housing respectively, adjust the position of the rectifier plate so that there is no step difference between the rectifier plate and the stable section housing.

[0019] As a technical solution of the present application, in step S6, after the manhole door composed of the rectifier plate, the cylinder and the circular cover plate is installed, measure the gap between the rectifier plate and the stable section housing, mark the position with a larger gap on the rectifier plate, disassemble the manhole door at the position with a larger gap, perform surfacing and grinding on the marked position of the rectifier plate by tungsten inert gas welding, and finally install the disassembled manhole door again. The beneficial effects of the present application:

[0020] The present application provides a manufacturing method for a manhole door of a wind tunnel settling chamber. After rolling a steel plate, a plurality of cylinders are welded on the outer wall surface, and then they are respectively cut into a plurality of fairing plates + cylinders, avoiding the individual pressing and forming of the fairing plates followed by welding. This enables the one-time batch production of the manhole door of the settling chamber, greatly improving the production efficiency. At the same time, by using the whole steel plate, longitudinal rib plates, and transverse rib plates as constraints and performing post-weld heat treatment, the deformation of the fairing plates during the welding and cutting of the cylinders is greatly reduced, avoiding the machining of the fairing plates, saving the construction cost, and shortening the construction period. In addition, by reserving a margin on the cylinders and assembling the manhole door for the second time, the zero-step difference between the manhole door and the inner wall surface of the settling chamber after installation is ensured, effectively improving the installation accuracy of the manhole door. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the application, and therefore 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.

[0022] For the front view of the manhole door provided by the embodiment of the present application;

[0023] Figure 1 For the sectional view of the manhole door provided by the embodiment of the present application;

[0024] Figure 2 For the first process schematic diagram of the manhole door manufacturing provided by the embodiment of the present application;

[0025] Figure 3 For the second process schematic diagram of the manhole door manufacturing provided by the embodiment of the present application;

[0026] Figure 4 For the third process schematic diagram of the manhole door manufacturing provided by the embodiment of the present application;

[0027] Figure 5 For the fourth process schematic diagram of the manhole door manufacturing provided by the embodiment of the present application;

[0028] Figure 6 For the fifth process schematic diagram of the manhole door manufacturing provided by the embodiment of the present application;

[0029] Figure 7 For the fifth process schematic diagram of the manhole door manufacturing provided by the embodiment of the present application.

[0030] Reference numerals: 1 - manhole door; 2 - settling chamber housing; 3 - circular plate; 4 - cylinder; 5 - circular cover plate; 6 - fairing plate; 7 - steel plate; 8 - outer contour line of the fairing plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] 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. Components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents 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.

[0033] It should be noted that like reference numerals and letters denote like 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.

[0034] 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.

[0035] 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.

[0036] 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" only 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.

[0037] In the description of the present application, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "connected", and "joined" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. 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.

[0038] Embodiment:

[0039] Please refer to Figure 1 , and in cooperation with referring to Figure 2 , there are a total of six identical manhole doors 1 on the stabilizing section housing 2. The diameter of the manhole door 1 is 600 mm, and the thicknesses of the rectifying plate 6 and the cylinder 4 are 8 mm.

[0040] As Figure 3 shown, select a steel plate 7 with dimensions of 8×2000×2800 mm and roll it with the same curvature as the stabilizing section housing 2. Draw six rectifying plate outer contour lines 8 on the inner arc surface of the rolled steel plate 7. The minimum distance between the six rectifying plate outer contour lines 8 is greater than 200 mm, and the minimum distance between the six rectifying plate outer contour lines 8 and the outer contour of the steel plate 7 is greater than 200 mm.

[0041] As Figure 4 shown, with the center points of the rectifying plate outer contour lines 8 as the reference, assemble multiple cylinders 4 on the outer arc surface of the steel plate 7. When assembling, the six cylinders 4 correspond to the six rectifying plate outer contour lines 8 one by one to ensure that the center point of each cylinder 4 coincides with the center point of the corresponding rectifying plate outer contour line 8. Leave an 8-mm margin in the width direction of the cylinder 4. When assembling the cylinder 4 and the arc surface of the steel plate 7, machine the cylinder 4 to make the gap between the cylinder 4 and the steel plate 7 less than 1 mm. Weld the cylinder 4 and the steel plate 7 using flux-cored wire gas shielded welding. Before welding, spot-weld multiple longitudinal rib plates and transverse rib plates on the inner arc surface of the steel plate 7. After welding, perform stress relief heat treatment on the cylinder 4 and the steel plate 7, and remove the longitudinal rib plates and transverse rib plates after stress relief heat treatment.

[0042] As Figure 5 shown, use a grinding wheel to cut along the rectifying plate outer contour lines 8 to cut the six connected rectifying plates 6 and cylinders 4 from the steel plate 7. As Figure 6As shown in the figure, six circular plates 3 are installed on the outer wall surface of the stabilizing section housing 2 and welded. Then, six connected flow straightening plates 6 and cylinders 4 are respectively installed inside the stabilizing section housing 2, and the positions of each connected flow straightening plate 6 and cylinder 4 are adjusted so that there is no step difference between each flow straightening plate 6 and the stabilizing section housing 2. Taking the end face of the circular plate 3 as the reference surface, mark the part where each cylinder 4 extends beyond the end face of the corresponding circular plate 3 in the width direction. Then, disassemble the six connected flow straightening plates 6 and cylinders 4, and use a grinding wheel to cut the cylinders 4 along the marked lines.

[0043] As Figure 7 shown in the figure, use flux-cored wire gas shielded welding to weld the six cut-connected flow straightening plates 6 and cylinders 4 to the circular cover plates 5 respectively. Then, install the six welded-connected flow straightening plates 6, cylinders 4, and circular cover plates 5 on the stabilizing section housing 2 and bolt-connect them to the corresponding circular plates 3 respectively. Measure the gap between each flow straightening plate 6 and the stabilizing section housing 2, mark the parts where the gap is more than 2 mm on the flow straightening plates 6, disassemble the manhole door 1, build up and grind the marked parts of the flow straightening plates 6 by tungsten inert gas welding, and finally install the manhole door 1 again.

[0044] It can be seen from this that this method adopts a process of welding the manhole door 1 components on the rolled whole steel plate 7 and then dividing them into multiple manhole doors 1, realizing the one-time batch production of the manhole door 1 and solving the problem of low construction efficiency caused by single-piece welding after the manhole door 1 is formed by pressing. At the same time, it adopts a process of using the whole steel plate 7 as a constraint and applying heat treatment during the welding process, solving the problem that the curvature of the thin-walled flow straightening plate 6 becomes smaller during the welding process and requires machining, saving construction costs and shortening the construction period. In addition, it has developed a secondary assembly process for the stabilizing section manhole door 1, solving the problems of step difference and large gap between the manhole door 1 and the housing after installation, and effectively improving the installation accuracy of the manhole door 1.

[0045] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A manufacturing method of a manhole door for a wind tunnel settling chamber, characterized in that, It includes the following steps: S1. Select a steel plate with the same thickness as the rectifying plate and roll it. After rolling, the curvature of the steel plate is consistent with that of the wind tunnel settling chamber shell; S2. Draw multiple spaced rectifying plate outer contour lines on the inner arc surface of the steel plate. Taking the center point of each rectifying plate outer contour line as a reference, assemble multiple corresponding cylinders on the outer arc surface of the steel plate, and the cylinders correspond one by one to the rectifying plate outer contour lines; S3. Weld the cylinders to the steel plate and perform stress relieving heat treatment on the cylinders and the steel plate. In step S3, before welding the cylinders to the steel plate, spot weld multiple longitudinal rib plates and transverse rib plates on the inner arc surface of the steel plate, and remove the longitudinal rib plates and the transverse rib plates after the overall heat treatment of the cylinders and the steel plate; S4. Use a grinding wheel to cut along each rectifying plate outer contour line respectively to obtain multiple connected rectifying plates and cylinders; S5. Weld multiple circular plates to the settling chamber shell respectively, and install the multiple connected rectifying plates and cylinders inside the settling chamber shell; Taking the end face of the circular plate as a reference, machine the end face of the corresponding cylinder until the end face of the circular plate and the end face of the corresponding cylinder are coplanar; S6. Disassemble the multiple connected rectifying plates and cylinders, weld the single rectifying plates and cylinders to the corresponding round cover plates respectively, and finally install the connected rectifying plates, cylinders and round cover plates on the settling chamber shell respectively, and bolt-connect the round cover plates to the corresponding circular plates respectively. In step S6, after the manhole door composed of the rectifying plate, the cylinder and the round cover plate is installed, measure the gap between the rectifying plate and the settling chamber shell, mark the positions on the rectifying plate where the gap is greater than 2 mm, disassemble the manhole door at the positions where the gap is greater than 2 mm, build up the weld and grind the marked positions of the rectifying plate by tungsten inert gas welding, and finally install the disassembled manhole door again.

2. The manufacturing method of the manhole door of the wind tunnel settling chamber according to claim 1, characterized in that, In step S2, the minimum distance between the outer contour of the steel plate and any rectifying plate outer contour line is greater than 200 mm, and the minimum distance between adjacent rectifying plate outer contour lines is greater than 200 mm.

3. The manufacturing method of the manhole door for the wind tunnel settling chamber according to claim 1, characterized in that, In step S2, a margin of 5 - 8 mm is reserved in the width direction of the cylinder.

4. The manufacturing method of the manhole door of the wind tunnel settling chamber according to claim 1, characterized in that In step S2, the center line of the cylinder coincides with the center point of the corresponding rectifying plate outer contour line.

5. The manufacturing method of the manhole door of the wind tunnel settling chamber according to claim 1, characterized in that, In step S5, when the multiple connected rectifying plates and cylinders are installed inside the settling chamber shell respectively, adjust the position of the rectifying plate so that there is no step difference between the rectifying plate and the settling chamber shell.

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