A wind tunnel coaxiality detection device

Abstract

The utility model provides a kind of wind tunnel coaxiality detection device, belong to wind tunnel coaxiality detection technical field, this wind tunnel coaxiality detection device includes rigid support frame, cross reference frame, measuring arm, spherical contact head and laser alignment component, the rigid support frame is octastar topological structure, the cross reference frame includes center block and cross beam, the center block is fixed in the geometric center position of the rigid support frame, the both ends of the cross beam connect the center block and the rigid support frame;The measuring arm is two-section telescopic arm structure, is installed on the cross beam, along the cross beam and rotates around the center block;Spherical contact head is arranged on the side of the measuring arm away from the cross beam, for contact with the measured surface point, eliminate directional error;Can solve the technical problem that large circular component coaxiality is difficult to accurately measure in wind tunnel construction.

Description

Technical Field

[0001] This utility model belongs to the field of wind tunnel coaxiality testing technology, specifically, it relates to a wind tunnel coaxiality testing device. Background Technology

[0002] The purpose of wind tunnel coaxiality testing is to ensure the consistency between the flow characteristics of the wind tunnel and the structure of the experimental equipment in relative position, thus avoiding errors in test results due to mismatch between the equipment and the airflow. In wind tunnel experiments, accurate measurement and control of the airflow coaxiality are typically required to ensure measurement accuracy. This usually necessitates the use of high-precision sensors, laser Doppler velocimeters, and airflow distribution probes for detection and correction. Optimizing wind tunnel design and improving testing techniques can enhance the efficiency and reliability of wind tunnel testing, especially in high-precision testing where minimizing the impact of external interference is crucial.

[0003] The coaxiality deviation of the tunnel is the deviation between the measured distance and the theoretical distance between the inner wall position of each section of the structure and the tunnel axis. The tunnel axis is the line connecting the centroids of the cross sections of each section of the tunnel. The control of the coaxiality of the tunnel includes the accuracy control of the forming surface of the tunnel bottom plate, the accuracy control of the forming surface of the tunnel side wall, and the control of the forming surface of the bottom of the cast-in-place slab under the tunnel grid.

[0004] According to the requirements, the deviation between the bottom and sidewall profile coordinates of the contraction section and the theoretical profile coordinates should be ≤ ±0.2%H (H is the height). The height of the contraction section is approximately 30m, which translates to a profile coordinate deviation of ≤ 60mm. Since the coaxiality of the contraction section is ≤ 15mm, simply controlling the precision of the contraction section based on the theoretical profile coordinates is insufficient to meet the coaxiality requirements. The bottom and sidewalls must be controlled based on the coaxiality deviation. The top profile coordinate of the contraction section is 10mm, with profile precision stricter than coaxiality precision. The top of the contraction section will be controlled using profile precision. The remaining sections of the tunnel will be controlled with reference to the coaxiality of the contraction section. The tunnel axis is a virtual spatial axis and cannot be directly laid out for point marking. Auxiliary lines need to be laid out to determine the virtual axis, ensuring that the tunnel civil construction and subsystem equipment installation follow the same baseline to achieve coaxiality that meets design requirements.

[0005] Existing wind tunnel construction faces the technical challenge of accurately measuring the coaxiality of medium to large circular components. Utility Model Content

[0006] In view of this, the present invention provides a wind tunnel coaxiality detection device, which can solve the technical problem of difficulty in accurately measuring the coaxiality of large circular components in wind tunnel construction and improve the geometric accuracy of wind tunnel airflow channels.

[0007] This utility model is implemented as follows: This invention provides a wind tunnel coaxiality testing device, comprising a rigid support frame, a cross-shaped reference frame, a measuring arm, a spherical contact head, and a laser alignment assembly. The rigid support frame has an octagonal star-shaped topology. The cross-shaped reference frame includes a central block and horizontal and vertical beams. The central block is fixed at the geometric center of the rigid support frame, and the two ends of the horizontal and vertical beams connect the central block and the rigid support frame. The measuring arm is a two-section telescopic arm structure, mounted on the horizontal and vertical beams, and rotates along the horizontal and vertical beams around the central block. The spherical contact head is located on the side of the measuring arm away from the horizontal and vertical beams for point contact with the measured surface to eliminate directional errors. The laser alignment assembly includes a laser and a target. The laser is positioned 50 mm directly above the central block, and the target is fixed at the center of the wind tunnel outlet flange end face.

[0008] Based on the above technical solution, the wind tunnel coaxiality testing device of this utility model can be further improved as follows: The central block is located at the intersection of the wind tunnel axis and the plane of the rigid support frame, and serves as the mechanical origin of the laser alignment assembly.

[0009] Furthermore, a rotary joint with a crossed roller bearing structure is provided between the measuring arm and the center block to provide continuous rotation of the measuring arm from 0 to 360°.

[0010] Furthermore, the center block has a cross-shaped through hole at its center, the top hole has a 60° chamfer, and the bottom hole has a 45° chamfer, which is used to eliminate laser diffraction rings.

[0011] Furthermore, the spherical contact head is a zirconia ceramic ball.

[0012] Furthermore, the laser is attached to the axis of the cross-shaped through hole via a magnetic base, and a 90° line-generating lens is provided at the front light outlet.

[0013] Furthermore, the target is a transparent acrylic disc with 0.5 mm concentric circles silkscreened on its surface.

[0014] Furthermore, a 0.5 mm preloaded wave spring is provided at the connection between the rotary joint and the measuring arm.

[0015] Furthermore, a screw is fixed to the bottom of the rigid support frame, and a spherical foot pad is fixed to the side of the screw away from the rigid support frame for adjusting the levelness of the rigid support frame.

[0016] Furthermore, the rigid support frame is welded and fixed by 8 main beams and 8 cross beams, and the fixed interface end has a 45° bevel sawing structure.

[0017] Compared with existing technologies, the beneficial effects of the wind tunnel coaxiality testing device provided by this utility model are: The rigid support frame, employing an octagonal star-shaped topology, enhances the stability and vibration resistance of the entire device. This structure helps maintain the accuracy of the device during wind tunnel testing and reduces the impact of external vibrations or errors on measurement results.

[0018] The cross-shaped reference frame includes a central block and horizontal and vertical beams. The central block is located at the intersection of the wind tunnel axis and the plane of the support frame, serving as the mechanical origin of the laser alignment assembly. This design ensures the accuracy of laser alignment during wind tunnel coaxiality testing, thereby guaranteeing the precision of the test.

[0019] The two-section telescopic arm structure of the measuring arm can be flexibly adjusted to meet different measurement needs. It is mounted on the horizontal and vertical beams and can rotate around the central block, thus achieving 360° omnidirectional inspection. This design enhances the adaptability of the device and the flexibility of measurement.

[0020] A spherical contact head, installed on the side of the measuring arm away from the horizontal and vertical beams, contacts the surface being measured, eliminating directional errors. This spherical contact head ensures precise contact with the object being measured, further improving the accuracy of the inspection.

[0021] The laser is positioned 50 mm directly above the center block, allowing for precise alignment with the target (located at the center of the wind tunnel outlet flange end face). The laser's positioning and the target's fixation ensure more accurate laser calibration throughout the wind tunnel coaxiality testing process, eliminating alignment errors.

[0022] A rotary joint with crossed roller bearings is installed between the measuring arm and the center block, providing continuous rotation from 0 to 360°. This allows the measuring arm to rotate freely in a wind tunnel, increasing the range and flexibility of the inspection.

[0023] The center of the central block has a cross-shaped through hole, and the top and bottom holes are chamfered at 60° and 45° respectively, which is intended to eliminate laser diffraction rings, thereby improving the accuracy of the laser beam and reducing measurement errors.

[0024] The spherical contact head uses zirconia ceramic balls, which have high wear resistance and high hardness, and can maintain stability and accuracy during long-term use.

[0025] The laser is attached to the axis of the cross-shaped through hole via a magnetic base, and is equipped with a 90° line-generating lens at the front end to ensure the accurate output direction of the laser beam, further improving the accuracy of laser measurement.

[0026] The target is a transparent acrylic disc with 0.5 mm concentric circles screen-printed on its surface, which can clearly display the light spot during laser alignment and improve the accuracy of laser alignment.

[0027] A 0.5 mm pre-tensioned wave spring is installed at the connection between the rotary joint and the measuring arm to enhance the stability of the connection and prevent measurement accuracy from being affected by vibration or loosening during use.

[0028] The rigid support frame is equipped with a screw at the bottom, and a spherical foot pad is fixed on the side of the screw away from the frame. This allows for adjustment of the level of the rigid support frame, ensuring the stability of the device on the ground and thus improving the accuracy of the measurement.

[0029] The rigid support frame is welded and fixed by eight main beams and eight crossbeams, with the fixed joints featuring a 45° beveled sawing structure. This structure enhances the compressive strength and stability of the support frame, ensuring that the entire device will not deform during long-term operation.

[0030] This device solves the technical problem of accurately measuring the coaxiality of large circular components in wind tunnel construction, and improves the geometric accuracy of the wind tunnel airflow channel. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of a wind tunnel coaxiality testing device. Figure 2 This is a schematic diagram of the laser alignment assembly. The attached diagram lists the components represented by each number as follows: 10. Rigid support frame; 20. Cross-shaped reference frame; 21. Center block; 22. Horizontal and vertical beams; 30. Measuring arm; 40. Spherical contact head; 50. Laser alignment assembly; 51. Laser; 52. Target. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figure 1-2The diagram shows an embodiment of a wind tunnel coaxiality testing device provided by this utility model. In this embodiment, it includes a rigid support frame 10, a cross-shaped reference frame 20, a measuring arm 30, a spherical contact head 40, and a laser alignment assembly 50. The rigid support frame 10 has an octagonal star topology. The cross-shaped reference frame 20 includes a central block 21 and horizontal and vertical beams 22. The central block 21 is fixed at the geometric center of the rigid support frame 10, and the two ends of the horizontal and vertical beams 22 connect the central block 21 and the rigid support frame 10. The measuring arm 30 is a two-section telescopic arm structure, installed on the horizontal and vertical beams 22, and rotates along the horizontal and vertical beams 22 and around the central block 21. The side of the measuring arm 30 away from the horizontal and vertical beams 22 is provided with a spherical contact head 40 for point contact with the measured surface to eliminate directional errors. The laser alignment assembly 50 includes a laser 51 and a target 52. The laser 51 is located 50 mm directly above the central block 21, and the target 52 is fixed at the center of the wind tunnel outlet flange end face.

[0035] In the above technical solution, the central block 21 is located at the intersection of the wind tunnel axis and the plane of the rigid support frame 10, and is used as the mechanical origin of the laser alignment component 50.

[0036] Furthermore, in the above technical solution, a rotary joint is provided between the measuring arm 30 and the center block 21, which is a cross roller bearing structure, to provide continuous rotation of the measuring arm 30 from 0 to 360°.

[0037] Furthermore, in the above technical solution, the center block 21 is provided with a cross-shaped through hole, the top hole is chamfered at 60°, and the bottom hole is chamfered at 45°, in order to eliminate laser diffraction rings.

[0038] Furthermore, in the above technical solution, the spherical contact head 40 is a zirconia ceramic ball.

[0039] Furthermore, in the above technical solution, the laser 51 is attached to the axis of the cross-shaped through hole by a magnetic base, and a 90° line-generating lens is provided at the front light outlet.

[0040] Furthermore, in the above technical solution, the target 52 is a transparent acrylic disc with 0.5 mm concentric circles silkscreened on its surface.

[0041] Furthermore, in the above technical solution, a 0.5 mm preloaded wave spring is provided at the connection between the rotary joint and the measuring arm 30.

[0042] Furthermore, in the above technical solution, a screw is fixed to the bottom of the rigid support frame 10, and a spherical foot pad is fixed to the side of the screw away from the rigid support frame 10 for adjusting the levelness of the rigid support frame 10.

[0043] Furthermore, in the above technical solution, the rigid support frame 10 is fixed by welding 8 main beams and 8 cross beams, and the fixed interface end has a 45° bevel sawing structure.

[0044] Specifically, the principle of this invention is as follows: In use, firstly, the rigid support frame is placed at the wind tunnel testing location, ensuring its levelness can be adjusted using the bottom screws and spherical feet. The stability of the frame is then checked to ensure that all components are securely fixed and will not produce errors due to vibration or external influences.

[0045] Secure the laser to the center block 50 mm directly above it using the magnetic base, ensuring alignment between the laser and the target. Adjust the target position to ensure it is centered on the wind tunnel outlet flange end face, allowing the laser beam to be precisely projected onto the target, thus completing laser alignment.

[0046] Adjust the position and angle of the measuring arm so that it can rotate 360° around the central block with the support of the horizontal and vertical beams. Within the required measurement range, the length of the measuring arm can be adjusted by the telescopic arm structure to adapt to different inspection tasks.

[0047] Move the spherical contact head along the measuring arm direction to ensure accurate contact with the surface being measured. The zirconia ceramic material of the spherical contact head reduces wear and maintains long-term stability.

[0048] When performing wind tunnel coaxiality testing, the laser alignment assembly provides a stable laser beam, and the rotation and extension of the measuring arm allows users to take measurements from different angles and positions. Due to the precise alignment of the laser and the target, measurement errors are minimized, ensuring high accuracy of the test results.

[0049] During the testing process, the coaxiality data of the wind tunnel was recorded using equipment. This data can be used for further analysis of the wind tunnel test results and parameter optimization.

[0050] After testing is completed, all mechanical components, especially the rotating joints and measuring arms, should be inspected regularly to ensure they are functioning properly. The laser and target should be cleaned regularly to prevent dust and dirt from affecting the accuracy of laser alignment.

Claims

1. A wind tunnel coaxiality testing device, characterized in that, The system includes a rigid support frame (10), a cross-shaped reference frame (20), a measuring arm (30), a spherical contact head (40), and a laser alignment assembly (50). The rigid support frame (10) has an octagonal star topology. The cross-shaped reference frame (20) includes a central block (21) and horizontal and vertical beams (22). The central block (21) is fixed at the geometric center of the rigid support frame (10). The two ends of the horizontal and vertical beams (22) connect the central block (21) and the rigid support frame. 10); The measuring arm (30) is a two-section telescopic arm structure, installed on the horizontal and vertical beams (22), and rotates along the horizontal and vertical beams (22) and around the center block (21); The side of the measuring arm (30) away from the horizontal and vertical beams (22) is provided with the spherical contact head (40) for point contact with the measured surface to eliminate directional errors; The laser alignment assembly (50) includes a laser (51) and a target (52), the laser (51) is located 50 mm directly above the center block (21), and the target (52) is fixed at the center of the wind tunnel outlet flange end face.

2. The wind tunnel coaxiality testing device according to claim 1, characterized in that, The central block (21) is located at the intersection of the wind tunnel axis and the plane of the rigid support frame (10), and serves as the mechanical origin of the laser alignment assembly (50).

3. The wind tunnel coaxiality testing device according to claim 2, characterized in that, A rotary joint is provided between the measuring arm (30) and the center block (21), which is a cross roller bearing structure, to provide the measuring arm (30) with 0–360° continuous rotation.

4. The wind tunnel coaxiality testing device according to claim 3, characterized in that, The center block (21) has a cross-shaped through hole at its center, with the top hole having a 60° chamfer and the bottom hole having a 45° chamfer, in order to eliminate laser diffraction rings.

5. The wind tunnel coaxiality testing device according to claim 4, characterized in that, The spherical contact head (40) is a zirconia ceramic ball.

6. The wind tunnel coaxiality testing device according to claim 5, characterized in that, The laser (51) is attached to the axis of the cross-shaped through hole by a magnetic base, and a 90° line-generating lens is provided at the front light outlet.

7. The wind tunnel coaxiality testing device according to claim 6, characterized in that, The target (52) is a transparent acrylic disc with 0.5 mm concentric circles silkscreened on its surface.

8. The wind tunnel coaxiality testing device according to claim 7, characterized in that, A 0.5 mm preloaded wave spring is provided at the connection between the rotary joint and the measuring arm (30).

9. A wind tunnel coaxiality testing device according to claim 8, characterized in that, A screw is fixed to the bottom of the rigid support frame (10), and a spherical foot pad is fixed to the side of the screw away from the rigid support frame (10) for adjusting the level of the rigid support frame (10).

10. A wind tunnel coaxiality testing device according to claim 9, characterized in that, The rigid support frame (10) is welded and fixed by 8 main beams and 8 cross beams, and the fixed interface end has a 45° bevel sawing structure.

Images