A wind tunnel model angle patch measuring tool

Abstract

This invention provides a measuring fixture for angle plates on wind tunnel models, comprising: a measuring arm, a base, a first set screw, an angle plate connector, and a second set screw. The first set screw passes through a first connecting hole to fix the angle plate connector in a first keyway. The angle plate to be measured is assembled in the second keyway of the angle plate connector. The second set screw passes through a second connecting hole and abuts against the bottom surface of the angle plate, pushing the angle plate upwards until the angle surface to be measured is completely abutted against the measuring arm. At this point, the tilt angle of the measuring arm is consistent with the tilt angle of the angle surface to be measured. Since the length of the measuring arm is fixed, the height difference between the two ends of the measuring arm can then be measured, and the tilt angle of the angle surface to be measured can be calculated using inverse trigonometric functions. This measuring fixture can measure angle plates of any angle, and the measurement is convenient and highly accurate.

Description

Technical Field

[0001] This utility model relates to the field of wind tunnel technology, and in particular to a tooling for measuring the angle of a wind tunnel model. Background Technology

[0002] The manufacturing precision of wind tunnel experimental models has a significant impact on the wind tunnel test data. In particular, the assembly precision and accurate angle division of the wind tunnel model's rudder have the greatest impact on the interpretation of experimental data. Therefore, high precision is required for the rudder installation angle and angle plates of the wind tunnel model to ensure accurate angular changes of the rudder on the model and obtain accurate wind tunnel data.

[0003] Angle plates are typically machined using wire EDM machines, with tolerances controlled to within 0.005mm. This places high demands on both the machine operator and the precision of the wire EDM machine. Furthermore, the small size and variety of angle plates make measurement difficult. Current conventional measurement methods include using a universal angle gauge for light comparison or a sine bar dial indicator. When using a universal angle gauge, the small angle surface necessitates observing the gap under light, requiring a high level of skill from the operator, as measurements taken by different individuals can vary slightly. Using a sine bar dial indicator requires a stopwatch, which is highly sensitive to the surface roughness of the wire-cut surface and prone to needle slippage, leading to measurement errors. Therefore, there is a need in this field for a convenient and highly accurate measuring fixture capable of measuring angle plates at any angle. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing an angle measuring fixture that is capable of measuring angle plates at any angle, and offers convenient and high-precision measurement capabilities.

[0005] This utility model provides a wind tunnel model angle plate measuring fixture, including: a measuring arm, a base, a first set screw, an angle plate connector, and a second set screw; one side of the base has a first connecting hole arranged in the horizontal direction, and the middle of the base has a first keyway arranged in the vertical direction, the first connecting hole passing through the side wall of the base and communicating with the first keyway; the measuring arm is a rod-shaped structure of uniform thickness, and a rotating shaft is connected to the upper part of the base at a position corresponding to the first keyway, the center of the measuring arm being rotatably connected to the rotating shaft; the angle plate connector is detachably connected in the first keyway, and the first set screw passes through the first connecting hole and abuts against the angle plate connector; the middle of the angle plate connector has a second keyway and a second connecting hole arranged in the vertical direction, the second keyway is detachably connected to the angle plate to be measured, and the second set screw passes through the second connecting hole and abuts against the bottom surface of the angle plate, so that the angle surface to be measured on the upper side of the angle plate abuts against the measuring arm.

[0006] Furthermore, the measuring arm has ends at both ends.

[0007] Furthermore, the end is cylindrical. Furthermore, the distance between the central axes of the two ends of the measuring arm is 100mm.

[0008] Furthermore, the measuring arm has a transition hole at its center, and the rotating shaft is connected in the transition hole.

[0009] Furthermore, the first keyway has chamfers on both sides facing the end of the measuring arm.

[0010] Furthermore, the width of the chamfer is greater than the width of the measuring arm.

[0011] Furthermore, the chamfer has an inclination of 45°.

[0012] Furthermore, the angle plate connector has two or more models, and the size of the second keyway in the angle plate connector of different models matches the size of the angle plate of the corresponding model.

[0013] Furthermore, the second connecting hole is coaxially arranged with the second keyway.

[0014] Compared with the prior art, this utility model has the following advantages: In use, the first set screw passes through the first connecting hole to fix the angle plate connector in the first keyway. The angle plate to be measured is assembled in the second keyway of the angle plate connector. The second set screw passes through the second connecting hole and abuts against the bottom surface of the angle plate, pushing the angle plate upwards so that the angle surface to be measured on the angle plate is completely abutted against the measuring arm. At this time, the tilt angle of the measuring arm is consistent with the tilt angle of the angle surface to be measured. Since the length of the measuring arm is fixed, the height difference between the two ends of the measuring arm can then be measured, and the tilt angle of the angle surface to be measured can be calculated using inverse trigonometric functions. This measuring fixture can measure angle plates of any angle, and the measurement is convenient and highly accurate. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a wind tunnel model angle measuring fixture according to an embodiment of the present invention; Figure 2 This is a vertical cross-sectional view of a wind tunnel model angle measuring fixture according to an embodiment of the present invention.

[0017] The attached diagram is labeled as follows: 1: Measuring arm; 11: Adapter hole; 12: End; 2: Base; 21: First connecting hole; 22: Rotating shaft; 23: First keyway; 24: Chamfer; 3: First set screw; 4: Angle plate connector; 41: Second keyway; 42: Second connecting hole; 5: Second set screw; 6: Angle plate. Detailed Implementation

[0018] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] like Figure 1 and Figure 2As shown, this utility model embodiment provides a wind tunnel model angle plate measuring fixture, including: a measuring arm 1, a base 2, a first set screw 3, an angle plate connector 4, and a second set screw 5; one side of the base 2 has a first connecting hole 21 arranged in the horizontal direction, and the middle of the base 2 has a first keyway 23 arranged in the vertical direction. The first connecting hole 21 passes through the side wall of the base 2 and communicates with the first keyway 23. The angle plate connector 4 is detachably connected to the first keyway 23. The first set screw 3 passes through the first connecting hole 21 and abuts against the angle plate connector 4, realizing the assembly and fixing function of the angle plate connector 4. The measuring arm 1 is a rod-shaped structure with uniform thickness. A rotating shaft 22 is connected to the upper part of the base 2 at a position corresponding to the first keyway 23. The center of the measuring arm 1 is rotatably connected to the rotating shaft 22. The measuring arm 1 can rotate circumferentially around the rotating shaft 22. Specifically, the center of the measuring arm 1 has a transition hole 11, and the rotating shaft 22 is connected to the transition hole 11.

[0022] The angle plate connector 4 has a second keyway 41 and a second connecting hole 42 arranged vertically in the middle. The angle plate 6 to be measured is detachably connected in the second keyway 41. The second set screw 5 passes through the second connecting hole 42 and abuts against the bottom surface of the angle plate 6, so that the angle to be measured surface on the upper side of the angle plate 6 abuts against the measuring arm 1. Preferably, in order to ensure the abutment effect between the second set screw 5 and the angle plate 6, the second connecting hole 42 and the second keyway 41 are arranged coaxially.

[0023] In one specific embodiment, when using this invention, the first set screw 3 passes through the first connecting hole 21 to fix the angle piece connector 4 in the first keyway 23. The angle piece 6 to be measured is assembled in the second keyway 41 of the angle piece connector 4. The second set screw 5 passes through the second connecting hole 42 and abuts against the bottom surface of the angle piece 6, pushing the angle piece 6 upward so that the angle surface to be measured of the angle piece 6 is completely abutted against the measuring arm 1. At this time, the tilt angle of the measuring arm 1 is consistent with the tilt angle of the angle surface to be measured. Since the length of the measuring arm 1 is fixed, the height difference between the two ends of the measuring arm 1 is then measured, and the tilt angle of the angle surface to be measured of the angle piece 6 can be calculated by inverse trigonometric functions. This measuring fixture can measure angle pieces 6 at any angle, and the measurement is convenient and highly accurate.

[0024] In one aspect of this utility model embodiment, the measuring arm 1 has end caps 12 at both ends. The end caps 12 facilitate accurate measurement of the height difference between the two ends of the measuring arm 1. In a preferred embodiment, the end caps 12 are cylindrical, so that the axis of the cylinder is the positioning point for measurement, resulting in more accurate measurement results. Optionally, the distance between the central axes of the end caps 12 at both ends of the measuring arm 1 is 100mm.

[0025] In one aspect of this utility model embodiment, the first keyway 23 has chamfers 24 on both sides facing the measuring arm 1. The width of the chamfers 24 is greater than the width of the measuring arm 1. This design reduces the restriction of the base 2 on the rotation range of the measuring arm 1, expands the rotation angle of the measuring arm 1, and ensures that its angle measurement range is sufficiently large. In a specific embodiment, the inclination of the chamfers 24 is 45°. In order to match the size of different models of angle plates 6, the angle plate connector 4 has two or more models, and the size of the second keyway 41 in the angle plate connector 4 of different models matches the size of the corresponding model of angle plate 6.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A tooling for measuring angle plates on a wind tunnel model, characterized in that, include: Measuring arm (1), base (2), first set screw (3), angle plate connector (4), and second set screw (5); The base (2) has a first connecting hole (21) arranged in the horizontal direction on one side, and a first keyway (23) arranged in the vertical direction in the middle of the base (2). The first connecting hole (21) passes through the side wall of the base (2) and communicates with the first keyway (23). The measuring arm (1) is a rod-shaped structure with uniform thickness. A rotating shaft (22) is connected to the upper part of the base (2) at a position corresponding to the first keyway (23). The center of the measuring arm (1) is rotatably connected to the rotating shaft (22). The angle plate connector (4) is detachably connected in the first keyway (23), and the first set screw (3) passes through the first connecting hole (21) and abuts against the angle plate connector (4); The angle plate connector (4) has a second keyway (41) and a second connecting hole (42) arranged vertically in the middle. The angle plate (6) to be measured is detachably connected in the second keyway (41). The second set screw (5) passes through the second connecting hole (42) and abuts against the bottom surface of the angle plate (6) so that the angle surface to be measured on the upper side of the angle plate (6) abuts against the measuring arm (1).

2. The wind tunnel model angle measuring fixture according to claim 1, characterized in that, The measuring arm (1) has ends (12) at both ends.

3. The wind tunnel model angle measuring fixture according to claim 2, characterized in that, The end (12) is cylindrical.

4. The wind tunnel model angle measuring fixture according to claim 3, characterized in that, The distance between the central axes of the two ends (12) of the measuring arm (1) is 100mm.

5. The wind tunnel model angle measuring fixture according to claim 1, characterized in that, The measuring arm (1) has a transition hole (11) at its center, and the rotating shaft (22) is connected in the transition hole (11).

6. The wind tunnel model angle measuring fixture according to claim 1, characterized in that, The first keyway (23) has chamfers (24) on both sides facing the measuring arm (1).

7. The wind tunnel model angle measuring fixture according to claim 6, characterized in that, The width of the chamfer (24) is greater than the width of the measuring arm (1).

8. The wind tunnel model angle measuring fixture according to claim 7, characterized in that, The chamfer (24) has an inclination of 45°.

9. The wind tunnel model angle measuring fixture according to claim 1, characterized in that, The angle plate connector (4) has two or more models, and the size of the second keyway (41) in the angle plate connector (4) of different models matches the size of the angle plate (6) of the corresponding model.

10. The wind tunnel model angle measuring fixture according to any one of claims 1 to 9, characterized in that, The second connecting hole (42) is coaxially arranged with the second keyway (41).

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