Adjustable bridge wind tunnel test bracket

Abstract

The present invention relates to the technical field of wind tunnel test supports, and more specifically to an adjustable bridge wind tunnel test support, comprising a support body and an adjustment support, wherein a connecting column is vertically arranged in the center of the support body, the connecting column being a hollow structure, and a disc for connecting a model is arranged at the top of the connecting column; the adjustment support is provided in two groups and is detachably arranged at both ends of the support body; a group of slide grooves are symmetrically arranged at the center of the support body, with scales on both sides of the slide grooves, a screw and a hanging ring for hanging a spring are arranged in the slide grooves, and a plurality of mass blocks for counterweights are arranged on the screw rods. The support body proposed by the present invention has a small spring suspension range and is light in weight, and is suitable for most bridges; if the experimental model requires a heavier mass or a larger spring suspension distance, detachable adjustment support parts can be added to both ends of the support body to meet the counterweight requirements and keep the spring suspension distance within the applicable range.

Description

Technical Field

[0001] The invention relates to the technical field of wind tunnel test brackets, and in particular to an adjustable bridge wind tunnel test bracket. Background Art

[0002] Wind tunnel testing of bridges is essential before the construction of long-span bridges. With the advancement of bridge wind resistance research, the test equipment used in existing wind tunnel tests is no longer well-suited for modern bridges or is inconvenient to use. For example, the brackets used to secure the models in wind tunnel tests involve multiple issues, such as counterweights, spring suspension distances, and model fixation. Sometimes the required weight of the model is too high to be met with mass blocks alone, and the spring suspension distance range of existing brackets is not suitable for most models. These issues cannot be addressed uniformly, and often, meeting one requirement leaves another unresolved.

[0003] Therefore, a new type of support equipment is needed that can meet the testing requirements of modern bridges. The support design should be adjustable, flexible, and universal, capable of supporting and adjusting different models. In addition, the support should be low-cost and stable to facilitate its promotion and application. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention aims to provide an adjustable bridge wind tunnel test bracket to solve the problems of unstable quality, limited spring suspension range, and poor versatility of the existing brackets.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0006] Provided is an adjustable bridge wind tunnel test bracket, comprising a bracket main body and an adjustment bracket, wherein a connecting column is vertically arranged at the center of the bracket main body, the connecting column is a hollow structure, and a disc for model connection is provided at the top of the connecting column; two groups of adjustment brackets are provided and are detachably arranged at both ends of the bracket main body; a group of slide grooves are symmetrically provided at the center position of the bracket main body, scales are provided on both sides of the slide grooves, a screw and a ring for hanging a spring are provided in the slide groove, and a plurality of groups of mass blocks for counterweights are provided on the screw rods.

[0007] Furthermore, the two adjusting supports are also provided with sliding grooves, and the sliding grooves on the adjusting supports are provided with lifting rings.

[0008] Furthermore: the bracket body is spindle-shaped, a dial is rotatably provided at the center of the bracket body, a through hole is provided at the center of the dial for the connecting column to pass through, and a 360° angle scale line is provided on the surface of the dial.

[0009] Furthermore, a plurality of arc grooves are provided on the scale plate with the center of the circle as the axis, and bolts for fixing the rotation angle of the scale plate are provided in the arc grooves.

[0010] Furthermore: the connecting column is provided with an inner cavity, and the inner cavity is provided with a detachable cover and multiple groups of detachable cast iron cylinders.

[0011] Furthermore: a first bolt for fixing and adjusting the position of the bracket is provided in the slide groove on the bracket body.

[0012] Furthermore: a threaded hole is vertically provided on one side of the bracket body close to the adjustment bracket, a second bolt is provided in the threaded hole, a first installation groove is horizontally provided at the bottom end of the threaded hole, a limit block is movably provided in the first installation groove, a limit groove for limiting the limit block is provided on one side of the adjustment bracket close to the limit block, and a limit inclined surface matching the second bolt is provided on one end of the limit block close to the second bolt.

[0013] Furthermore, one end of the limiting block away from the limiting groove is connected to one end of a return spring, and the other end of the return spring is connected to the side wall of the first installation groove.

[0014] Furthermore: a second mounting groove is provided on the lower side of the first mounting groove, a ball is provided in the second mounting groove, and the upper side of the ball contacts the limit block.

[0015] The beneficial effects of the present invention are:

[0016] 1. The bracket body proposed in the present invention has a small range of spring suspension distance and is light in weight, making it suitable for most bridges. If the experimental model requires a heavier mass or a larger spring suspension distance, detachable adjustment bracket parts can be added to both ends of the bracket body to meet the counterweight requirements and keep the spring suspension distance within the applicable range.

[0017] 2. The present invention uses the cooperation between the screw and the slide to pass the required number of mass blocks on the screw, and then fix them with a nut adapted to the screw. The screw slides in the slide, so that the connection of the mass blocks is stable and it is convenient to change the distance of the mass blocks relative to the center of the bracket, thereby changing the rotation radius to meet the mass moment of inertia required by the model. At the same time, scales are provided on both sides of the slide, which realizes the function of more convenient mass block movement and distance measurement. It is no longer necessary for staff to measure the distance with a ruler, which is more convenient.

[0018] 3. The connecting column of the bracket of the present invention is neither hollow nor solid. The inner cavity provided in the connecting column is filled with movable cast iron cylinders. By changing the number of cast iron cylinders in the inner cavity, the total mass of the bracket can be adjusted. At the same time, the surface of the dial provided on the bracket body is engraved with 360° angle scale lines, which eliminates the process of manual measurement of the model angle, reduces the error in the experimental process, and makes the experimental results more accurate.

[0019] 4. By setting a second bolt, when the second bolt rests on the guide limit inclined surface of the limit block, the limit block is forced to move toward the limit groove and embed into the limit groove, thereby achieving fixation between the adjustment bracket and the bracket body and preventing the adjustment bracket from rotating at will. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the overall structure of the adjustable bridge wind tunnel test bracket provided in Example 1 of the present invention;

[0021] Figure 2 A schematic diagram of the structure of the adjustment bracket provided in Example 1 of the present invention;

[0022] Figure 3 A schematic cross-sectional view of the connection structure between the bracket body and the adjustable bracket provided in Example 2 of the present invention;

[0023] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0024] 1. Disc, 2. Connecting column, 3. Dial, 4. Arc groove, 5. Screw, 6. Lifting ring, 7. First bolt, 8. Adjustment bracket, 9. Bracket body, 10. Slide groove, 11. Threaded hole, 12. Second bolt, 13. First mounting groove, 14. Limit block, 15. Limit groove, 16. Limiting inclined plane, 17. Return spring, 18. Second mounting groove, 19. Ball. DETAILED DESCRIPTION

[0025] The specific embodiments of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all inventions and creations utilizing the concepts of the present invention are protected.

[0026] Example 1

[0027] Reference Figure 1-Figure 2, an adjustable bridge wind tunnel test bracket, including a bracket body 9 and an adjustment bracket 8, the bracket body 9 is spindle-shaped, and a connecting column 2 is vertically arranged in the center of the bracket body 9. The connecting column 2 is a hollow structure, and the connecting column 2 is provided with an inner cavity, and the inner cavity is provided with a detachable cover and multiple groups of detachable cast iron cylinders. The main purpose is to change the weight of the bracket itself, so as to better adjust the counterweight mass required by the model; a disc 1 for model connection is provided at the top of the connecting column 2; the adjustment bracket 8 is provided with two groups and is detachably arranged at both ends of the bracket body 9; a group of slide grooves 10 are symmetrically provided on the bracket body 9 in the center position, and scales are provided on both sides of the slide groove 10. A screw rod 5 and a ring 6 for hanging a spring are provided in the slide groove 10, and a plurality of groups of mass blocks for counterweights are provided on the screw 5. Screw 5 is primarily used to secure the counterweight mass. The mass is threaded onto screw 5 and slides within slot 10, changing the mass's position and thereby adjusting the distance from the mass to the center of bracket body 9 to meet the model's mass moment of inertia and other requirements. Slots 10 are also provided on the two adjustment brackets 8, each containing a lifting ring 6. This lifting ring 6 is used to suspend the spring, and its position can be adjusted to adjust the spring's suspension distance.

[0028] As a preferred embodiment, a scale plate 3 is rotatably mounted at the center of the bracket body 9. A through-hole is provided at the center of the scale plate 3 for the connecting column 2 to pass through. The surface of the scale plate 3 is provided with 360° angle scale lines. This facilitates adjustment of the model's angle of attack, eliminating the need for manual testing of the model's angle, reducing experimental errors, and resulting in more accurate experimental results. The scale plate 3 is provided with multiple sets of arc grooves 4 centered on the center of the circle. Bolts are located within the arc grooves 4 to secure the rotation angle of the scale plate 3. The scale plate 3 can be rotated by adjusting the bolts to adjust the model's angle of attack. In this embodiment, a first bolt 7 is located within a slide groove 10 on the bracket body 9 to secure the position of the adjustable bracket 8.

[0029] The spring suspension distance refers to the distance between the spring and the bracket, which is also commonly referred to as the "hanging height" or "hanging length". It is a bracket adjustment method commonly used in wind tunnel tests. In the bridge wind tunnel test, the model needs to be hung on the bracket, and the external force on the model is reduced by spring suspension to ensure the accuracy of the test results. The spring suspension distance is an important parameter for adjusting the hanging height. By adjusting the spring suspension distance, the magnitude of the force applied to the model can be controlled. If the experimental model requires a heavier mass, or a larger spring suspension distance, a detachable adjustment bracket 8 part can be added to both ends of the bracket body 9, which not only meets the counterweight requirements, but also keeps the spring suspension distance within the applicable range. Therefore, an adjustable spring suspension distance can meet the requirements of different models, which is conducive to ensuring the accuracy of the test.

[0030] Example 2

[0031] In order to achieve fixation between the adjustment bracket 8 and the bracket body 9 and prevent the adjustment bracket 8 from rotating at will, this embodiment has the following design.

[0032] Reference Figure 3 A threaded hole 11 is vertically provided on the side of the bracket body 9 near the adjustment bracket 8. A second bolt 12 is disposed in the threaded hole 11. A first mounting slot 13 is transversely provided at the bottom end of the threaded hole 11. A limit block 14 is movably disposed in the first mounting slot 13. Specifically, one end of the limit block 14, which is away from the limit slot 15, is connected to one end of a return spring 17. The other end of the return spring 17 is connected to the side wall of the first mounting slot 13. A limit slot 15 for limiting the position of the limit block 14 is provided on the side of the adjustment bracket 8 near the limit block 14. A limit inclined surface 16 that cooperates with the second bolt 12 is provided on the end of the limit block 14 near the second bolt 12.

[0033] When conducting a bridge wind tunnel test, if the experimental model requires a heavier mass or a larger spring suspension distance, it is necessary to add a detachable adjustment bracket 8 part at both ends of the bracket body 9. At this time, the second bolt 12 can be rotated so that the second bolt 12 moves downward toward the limit block 14. When the second bolt 12 abuts against the guide limit inclined surface 16 of the limit block 14, the second bolt 12 is continued to be rotated so that the limit block 14 is forced to move toward the limit groove 15 and embeds into the limit groove 15, thereby achieving the fixation between the adjustment bracket 8 and the bracket body 9 and preventing the adjustment bracket 8 from rotating at will; when the adjustment bracket 8 is not needed, the second bolt 12 is moved upward away from the limit block 14 so that the second bolt 12 does not exert force on the limit block 14, thereby resetting the limit block 14 under the action of the reset spring 17 and releasing the fixed relationship between the adjustment bracket 8 and the bracket body 9.

[0034] As a preferred embodiment, a second mounting groove 18 is provided below the first mounting groove 13. A ball 19 is provided in the second mounting groove 18. The upper side of the ball 19 contacts the stop block 14. The rolling friction greatly reduces the friction force when the stop block 14 moves, allowing the stop block 14 to move more effectively and prevent it from getting stuck.

[0035] The present invention uses the cooperation between the screw and the slide groove to pass the required number of mass blocks on the screw, and then fix them with a nut adapted to the screw. The screw slides in the slide groove, so that the connection of the mass blocks is stable and it is convenient to change the distance of the mass blocks relative to the center of the bracket, thereby changing the rotation radius to meet the mass moment of inertia required by the model. At the same time, scales are provided on both sides of the slide groove, which realizes the function of more convenient mass block movement and distance measurement, and does not require staff to measure the distance with a ruler, which is more convenient.

[0036] The adjustable bridge wind tunnel test bracket provided in Example 1 of the present invention has been made into a physical object, and experiments have proved that it has broad application prospects. During the bridge wind tunnel test, the bracket can be used to easily and conveniently adjust the counterweight, spring spacing, change the model angle, change the position of the mass block, etc., so that these key problems can be perfectly solved on one bracket.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0038] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An adjustable bridge wind tunnel test bracket, characterized in that: The invention comprises a bracket body (9) and an adjusting bracket (8), wherein a connecting column (2) is vertically arranged at the center of the bracket body (9), wherein the connecting column (2) is a hollow structure, and a disc (1) for connecting a model is arranged at the top of the connecting column (2); the adjusting bracket (8) is provided with two groups and is detachably arranged at both ends of the bracket body (9); a group of slide grooves (10) are symmetrically arranged at the center position on the bracket body (9), and scales are provided on both sides of the slide groove (10), and a screw rod (5) and a hanging ring (6) for hanging a spring are arranged in the slide groove (10), and a plurality of mass blocks for counterweights are provided on the screw rod (5).

2. The adjustable bridge wind tunnel test bracket according to claim 1, characterized in that: The two adjustment brackets (8) are also provided with a slide groove (10), and a lifting ring (6) is provided in the slide groove (10) on the adjustment bracket (8).

3. The adjustable bridge wind tunnel test bracket according to claim 1, characterized in that: The bracket body (9) is in the shape of a shuttle. A scale plate (3) is rotatably provided at the center of the bracket body (9). A through hole for the connecting column (2) to pass through is provided at the center of the scale plate (3). 360-degree angle scale lines are provided on the surface of the scale plate (3).

4. The adjustable bridge wind tunnel test bracket according to claim 3, characterized in that: The scale disc (3) is provided with a plurality of arc grooves (4) with the center of the circle as the axis, and bolts for fixing the rotation angle of the scale disc (3) are provided in the arc grooves (4).

5. The adjustable bridge wind tunnel test bracket according to claim 1, characterized in that: The connecting column (2) is provided with an inner cavity, and the inner cavity is provided with a detachable cover and a plurality of groups of detachable cast iron cylinders.

6. The adjustable bridge wind tunnel test bracket according to claim 1, characterized in that: A first bolt (7) for fixing and adjusting the position of the bracket (8) is provided in the sliding groove (10) on the bracket body (9).

7. The adjustable bridge wind tunnel test bracket according to claim 1, characterized in that: A threaded hole (11) is vertically provided on one side of the bracket body (9) close to the adjustment bracket (8), a second bolt (12) is provided in the threaded hole (11), a first installation groove (13) is horizontally provided at the bottom end of the threaded hole (11), a limit block (14) is movably provided in the first installation groove (13), a limit groove (15) for limiting the limit block (14) is provided on one side of the adjustment bracket (8) close to the limit block (14), and a limit inclined surface (16) matching the second bolt (12) is provided on one end of the limit block (14).

8. The adjustable bridge wind tunnel test bracket according to claim 7, characterized in that: One end of the limiting block (14) away from the limiting groove (15) is connected to one end of a return spring (17), and the other end of the return spring (17) is connected to the side wall of the first installation groove (13).

9. The adjustable bridge wind tunnel test bracket according to claim 7, characterized in that: A second mounting groove (18) is provided on the lower side of the first mounting groove (13), a ball (19) is provided in the second mounting groove (18), and the upper side of the ball (19) contacts the limit block (14).

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