Wind tunnel balance calibration fixing device and use method thereof

Abstract

The invention belongs to the technical field of multi-component aerodynamic load measurement sensors, and discloses a wind tunnel balance calibration fixing device and a use method thereof. The wind tunnel balance calibration fixing device is of a steel piece and copper piece combined structure, and a pressing block, an upper cushion block, a balance and rudder, a lower cushion block and a calibration supporting rod are sequentially stacked from top to bottom to form a combined body. The assembly is positioned through the pin I and the pin II and fixed through four sets of gaskets distributed in the circumferential direction of the pressing block, bolts and a special screw located in the center of the pressing block. The use method comprises the following steps: mounting the calibration support rod; installing an upper cushion block, a balance, a rudder, a lower cushion block and a pressing block; mounting a pin I and a pin II; and installing four groups of bolts, gaskets and special screws, and fixing the assembly. According to the wind tunnel balance calibration fixing device and the use method thereof, a guarantee is provided for realizing static calibration of a control plane hinge moment balance or a component balance.

Description

Technical Field

[0001] The present invention belongs to the technical field of multi-component aerodynamic load measurement sensors, and particularly relates to a calibration fixing device for a wind tunnel balance and a using method thereof. Background Art

[0002] At present, in high-speed wind tunnel tests such as hinge moment and component force measurement tests, the balance and rudder are mostly integrated or separated. To complete the calibration of hinge moment balances and component balances, the reverse installation method is usually used to fixedly install the hinge moment measurement rudder or component (hereinafter referred to as the measurement rudder). The measurement rudder is usually of a special shape. For large-sized measurement rudders, pin holes, threaded holes or through holes can be provided on the measurement rudder to fix the measurement rudder and the calibration strut. However, in the case where the measurement rudder cannot be damaged too much, the measurement rudder and the calibration strut cannot be fixed by simultaneously providing pin holes and threaded holes or through holes. At the same time, in order to reduce the mass of the calibration strut, lower the processing cost and cycle, a special calibration fixing device for a wind tunnel balance needs to be developed.

[0003] Currently, there is an urgent need to develop a calibration fixing device for a wind tunnel balance and a using method thereof. Summary of the Invention

[0004] One technical problem to be solved by the present invention is to provide a calibration fixing device for a wind tunnel balance, and another technical problem to be solved by the present invention is to provide a using method of the calibration fixing device for a wind tunnel balance.

[0005] The calibration fixing device for a wind tunnel balance of the present invention includes a steel and copper combined structure, including balance and rudder 1, upper cushion block 2, lower cushion block 3, pin Ⅰ 4, special screw 5, pressing block 6, pin Ⅱ 7, gasket 8, bolt 9 and calibration strut; The pressing block 6, upper cushion block 2, balance and rudder 1, lower cushion block 3, and calibration strut are stacked in sequence from top to bottom to form a combined body; the combined body is positioned by pin Ⅰ 4 and pin Ⅱ 7 that sequentially pass through the pressing block 6, upper cushion block 2, balance and rudder 1, lower cushion block 3, and calibration strut from top to bottom, and is fixed by four groups of gaskets 8, bolts 9 distributed circumferentially along the pressing block 6 and a special screw 5 located at the center of the pressing block 6; The balance and rudder 1, pressing block 6, and calibration strut are made of steel, and the upper cushion block 2 and lower cushion block 3 are made of copper; The balance and rudder 1 includes a balance and a rudder connected in sequence from left to right, and the balance and the rudder are integrally processed or separately combined and processed; the balance is a hinge balance or a component balance, and the rudder is a regular rudder or an irregular rudder. The regular rudder includes a triangular rudder, a parallelogram rudder, and a rhombic rudder; The lower surface of the upper cushion block 2 is provided with an upper cushion block profile 21 matching the upper surface of the balance and rudder 1, the upper surface of the upper cushion block 2 is provided with an upper cushion block reference surface 22 matching the lower surface of the pressing block 6, and the remaining surface is a plane; The upper surface of the lower cushion block 3 is provided with a lower cushion block profile surface 25 that matches the lower surface of the balance and rudder 1, and the lower surface of the lower cushion block 3 is provided with a lower cushion block reference surface 26 that matches the strut reference surface I 10, and the remaining surfaces are flat surfaces; The calibration strut includes an installation section 12, a straight section 14, and a connecting cone 15 that are sequentially connected from front to back.

[0006] Furthermore, the upper surface of the rudder of the balance and rudder 1 is provided with a balance and rudder profile surface I 11, and the lower surface is provided with a balance and rudder profile surface II 16; there are vertically penetrating vertical pin holes I 19 and pin holes II 20 on the rudder of the balance and rudder 1.

[0007] Furthermore, the upper cushion block 2 is provided with vertically penetrating vertical pin holes III 23 and pin holes IV 24.

[0008] Furthermore, the lower cushion block 3 is provided with vertical pin holes V 27 and pin holes VI 28.

[0009] Furthermore, the pressing block 6 is a square block, provided with pin holes VII 29 and pin holes VIII 30; the upper surface is provided with a pressing block reference surface I 33, and the lower surface is provided with a pressing block reference surface II 34; the pin holes VII 29 and pin holes VIII 30 are used for the installation and positioning of the assembly, the pressing block reference surface I 33 assists in the installation of the assembly, and the pressing block reference surface II 34 matches the upper cushion block reference surface 22 of the upper cushion block 2.

[0010] Furthermore, the special screw 5 is provided with an external thread, the upper end surface is provided with an internal hexagon 36, and the lower end surface is provided with a special screw surface 35 for pressing against the assembly.

[0011] Furthermore, the upper surface of the installation section 12 is provided with a strut reference surface I 10, and the lower surface is provided with a strut reference surface III 17; the upper surface of the equal value section 14 is provided with a strut reference surface II 13, and the lower surface is provided with a strut reference surface IV 18; the strut reference surface I 10 matches the lower cushion block reference surface 26 and is used for installing the lower cushion block 3, the balance and rudder 1, the upper cushion block 2, and the pressing block 6, and the strut reference surface III 17 is the installation reference for reverse calibration; the strut reference surface II 13 and the strut reference surface IV 18 are used to check whether the wind tunnel balance calibration fixing device is installed in place; a threaded hole II 37 is provided on the central axis of the connecting cone 15 of the calibration strut for fixing with the calibration mechanism.

[0012] The usage method of the wind tunnel balance calibration fixing device of the present invention includes the following steps: S10. Use a special bolt to tighten the threaded hole II 37 to fixedly connect the connecting cone 15 to the calibration mechanism; S20. Place the upper cushion block 2 above the balance and rudder 1, making the surface 21 of the upper cushion block fit closely with the surface I 11 of the balance and rudder, aligning the pin hole I 19 vertically with the pin hole III 23, and aligning the pin hole II 20 vertically with the pin hole IV 24; S30. Place the lower cushion block 3 below the balance and rudder 1, making the surface 25 of the lower cushion block fit closely with the surface II 16 of the balance and rudder, aligning the pin hole V 27 vertically with the pin hole I 19 and the pin hole III 23, and aligning the pin hole VI 28 vertically with the pin hole II 20 and the pin hole IV 24; S40. After pressing and placing the upper cushion block 2, the balance and rudder 1, and the lower cushion block 3 on the installation section 12 of the calibration support rod, make the reference surface 26 of the lower cushion block fit closely with the support rod reference surface I 10, aligning the pin hole IX 39 vertically with the pin hole V 27, the pin hole I 19, and the pin hole III 23, and aligning the pin hole X 40 vertically with the pin hole VI 28, the pin hole II 20, and the pin hole IV 24; S50. Place the pressing block 6 on the upper cushion block 2, making the reference surface II 34 of the pressing block fit closely with the reference surface 22 of the upper cushion block, aligning the pin hole VII 29 vertically with the pin hole III 23, the pin hole I 19, the pin hole V 27, and the pin hole IX 39, and aligning the pin hole VIII 30 vertically with the pin hole IV 24, the pin hole II 20, the pin hole VI 28, and the pin hole X 40; S60. Insert the dowel pin I 4 from top to bottom through the pin hole VII 29 of the pressing block 6, the pin hole III 23 of the upper cushion block 2, the pin hole I 19 of the balance and rudder 1, the pin hole V 27 of the lower cushion block 3, and the pin hole IX 39 of the calibration support rod; insert the dowel pin II 7 from top to bottom through the pin hole VIII 30 of the pressing block 6, the pin hole IV 24 of the upper cushion block 2, the pin hole II 20 of the balance and rudder 1, the pin hole VI 28 of the lower cushion block 3, and the pin hole X 40 of the calibration support rod; S70. Place the washers 8 on the respective through holes 32 of the pressing block 6, insert the four groups of bolts 9 through the inner holes of the washers 8, then place the threaded sections of the bolts 9 from top to bottom into the through holes 32 from the reference surface I 33 of the pressing block, and then screw them into the threaded hole III 38 to fix the pressing block 6, the upper cushion block 2, the balance and rudder 1, the lower cushion block 3, and the calibration support rod, and ensure that the reference surface II 34 of the pressing block fits closely with the reference surface 22 of the upper cushion block, the surface 21 of the upper cushion block fits closely with the surface I 11 of the balance and rudder, the surface 25 of the lower cushion block fits closely with the surface II 16 of the balance and rudder, and the reference surface 26 of the lower cushion block fits closely with the support rod reference surface I 10; S80. Insert a wrench into the hexagon socket 36, rotate the wrench to screw the special screw 5 into the threaded hole I 31 until the special screw surface 35 of the special screw 5 presses tightly against the reference surface 22 of the upper cushion block, thereby fixing the pressing block 6, the upper cushion block 2, the balance and rudder 1, the lower cushion block 3, and the calibration support rod; S90. Fine-tune the four groups of bolts 9 and the special screw 5 again to fix the assembly; S100. Check the parallelism between the reference surface I 33 of the pressing block, the support rod reference surface II 13, and the measuring beam or reference plane on the balance and rudder 1 to ensure that the wind tunnel balance calibration fixing device is installed in place; S110. Rotate the roll device of the calibration mechanism by 180°, check the parallelism between the strut reference plane Ⅲ17, the strut reference plane Ⅳ18 and the measuring beam or reference plane of the balance and the rudder 1, and ensure that the wind tunnel balance calibration fixing device is reversely installed in place.

[0013] The wind tunnel balance calibration fixing device and its usage method of the present invention ensure that the profiled part of the rudder is not damaged and there is sufficient contact area by setting the upper cushion block and the lower cushion block; the mass of the calibration strut is reduced, and the processing cost and cycle are lowered by setting the pressing block and the calibration strut; the precise positioning and installation of the calibration fixing device are achieved by setting the pin holes without damaging the measuring rudder too much; it provides technical guarantee for realizing the static calibration of the rudder hinge moment balance. Description of the Drawings

[0014] Figure 1 is a perspective view of the wind tunnel balance calibration fixing device of the present invention; Figure 2 is a front view of the wind tunnel balance calibration fixing device of the present invention; Figure 3 is a top view of the wind tunnel balance calibration fixing device of the present invention; Figure 4 is a left view of the wind tunnel balance calibration fixing device of the present invention; Figure 5 is a front view of the balance and the rudder in the wind tunnel balance calibration fixing device of the present invention; Figure 6 is a top view of the balance and the rudder in the wind tunnel balance calibration fixing device of the present invention; Figure 7 is a left view of the balance and the rudder in the wind tunnel balance calibration fixing device of the present invention; Figure 8 is a front view of the upper cushion block in the wind tunnel balance calibration fixing device of the present invention; Figure 9 is a top view of the upper cushion block in the wind tunnel balance calibration fixing device of the present invention; Figure 10 is Figure 9 the A-A cross-sectional view of Figure 11 is Figure 9 the B-B cross-sectional view of Figure 12 is a front view of the lower cushion block in the wind tunnel balance calibration fixing device of the present invention; Figure 13 is a top view of the lower cushion block in the wind tunnel balance calibration fixing device of the present invention; Figure 14 is Figure 13 the A-A cross-sectional view of Figure 15 is Figure 13 the B-B sectional view; Figure 16 is the front view of the pressure block in the wind tunnel balance calibration fixing device of the present invention; Figure 17 is the top view of the pressure block in the wind tunnel balance calibration fixing device of the present invention; Figure 18 is the front view of the special screw in the wind tunnel balance calibration fixing device of the present invention; Figure 19 is the top view of the special screw in the wind tunnel balance calibration fixing device of the present invention; Figure 20 is the front view of the calibration support rod in the wind tunnel balance calibration fixing device of the present invention; Figure 21 is the top view of the calibration support rod in the wind tunnel balance calibration fixing device of the present invention; Figure 22 is the top view of the calibration support rod in the wind tunnel balance calibration fixing device of the present invention; Figure 23 is Figure 21 the A-A sectional view.

[0015] In the figure, 1. balance and rudder; 2. upper cushion block; 3. lower cushion block; 4. pin Ⅰ; 5. special screw; 6. pressure block; 7. pin Ⅱ; 8. gasket; 9. bolt; 10. support rod reference plane Ⅰ; 11. balance and rudder profile Ⅰ; 12. installation section; 13. support rod reference plane Ⅱ; 14. straight section; 15. connecting cone; 16. balance and rudder profile Ⅱ; 17. support rod reference plane Ⅲ; 18. support rod reference plane Ⅳ; 19. pin hole Ⅰ; 20. pin hole Ⅱ; 21. upper cushion block profile; 22. upper cushion block reference plane; 23. pin hole Ⅲ; 24. pin hole Ⅳ; 25. lower cushion block profile; 26. lower cushion block reference plane; 27. pin hole Ⅴ; 28. pin hole Ⅵ; 29. pin hole Ⅶ; 30. pin hole Ⅷ; 31. threaded hole Ⅰ; 32. through hole; 33. pressure block reference plane Ⅰ; 34. pressure block reference plane Ⅱ; 35. special screw surface; 36. internal hexagon; 37. threaded hole Ⅱ; 38. threaded hole Ⅲ; 39. pin hole Ⅸ; 40. pin hole Ⅹ. Specific embodiments

[0016] The present invention will be described in detail below with reference to the drawings and embodiments.

[0017] Embodiment: The design load requirements of the wind tunnel balance calibration fixing device in this embodiment are as follows: the lift Y component is 170 N, the pitching moment Mz component is 10.7 N·m, and the hinge moment Mx component is 1.6 N·m. The static calibration uncertainty is better than 0.5%.

[0018] AsFigures 1 to 23 As shown in Figures 1 to 23 , the wind tunnel balance calibration fixture of this embodiment is a combined structure of steel and copper parts, including balance and rudder 1, upper cushion block 2, lower cushion block 3, pin Ⅰ 4, special screw 5, pressure block 6, pin Ⅱ 7, gasket 8, bolt 9 and calibration support rod; The pressure block 6, upper cushion block 2, balance and rudder 1, lower cushion block 3, and calibration support rod are stacked in sequence from top to bottom to form a combined body; the combined body is positioned by pin Ⅰ 4 and pin Ⅱ 7 that pass through the pressure block 6, upper cushion block 2, balance and rudder 1, lower cushion block 3, and calibration support rod from top to bottom in sequence, and is fixed by four groups of gaskets 8, bolts 9 distributed circumferentially along the pressure block 6 and the special screw 5 located at the center of the pressure block 6; The balance and rudder 1, pressure block 6, and calibration support rod are steel parts with sufficient strength and stiffness; the upper cushion block 2 and lower cushion block 3 are copper parts, which can better protect the corresponding surface of the balance and rudder 1 from being damaged by pressing; The balance and rudder 1 include a balance and a rudder connected in sequence from left to right, and the balance and the rudder are processed integrally or by split combination; the balance is a hinge balance or a component balance, and the rudder is a regular rudder or an irregular rudder. The regular rudder includes a triangular rudder, a parallelogram rudder, and a rhombic rudder; The lower surface of the upper cushion block 2 is provided with an upper cushion block surface 21 that matches the upper surface of the balance and rudder 1, and the upper surface of the upper cushion block 2 is provided with an upper cushion block reference surface 22 that matches the lower surface of the pressure block 6, and the remaining surface is a plane; The upper surface of the lower cushion block 3 is provided with a lower cushion block surface 25 that matches the lower surface of the balance and rudder 1, and the lower surface of the lower cushion block 3 is provided with a lower cushion block reference surface 26 that matches the support rod reference surface Ⅰ 10, and the remaining surface is a plane; The calibration support rod includes an installation section 12, an equal - straight section 14, and a connection cone 15 connected in sequence from front to back.

[0019] Furthermore, the upper surface of the rudder of the balance and rudder 1 is provided with a balance and rudder surface Ⅰ 11, and the lower surface is provided with a balance and rudder surface Ⅱ 16; vertical pin holes Ⅰ 19 and pin holes Ⅱ 20 that penetrate up and down are provided on the rudder of the balance and rudder 1.

[0020] Furthermore, vertical pin holes Ⅲ 23 and pin holes Ⅳ 24 that penetrate up and down are provided on the upper cushion block 2.

[0021] Furthermore, vertical pin holes Ⅴ 27 and pin holes Ⅵ 28 are provided on the lower cushion block 3.

[0022] Furthermore, the pressure block 6 is a square block, provided with pin holes Ⅶ 29 and pin holes Ⅷ 30; the upper surface is provided with a pressure block reference surface Ⅰ 33, and the lower surface is provided with a pressure block reference surface Ⅱ 34; the pin holes Ⅶ 29 and pin holes Ⅷ 30 are used for the installation and positioning of the combined body, the pressure block reference surface Ⅰ 33 assists in the installation of the combined body, and the pressure block reference surface Ⅱ 34 matches the upper cushion block reference surface 22 of the upper cushion block 2.

[0023] Further, the special screw 5 is provided with an external thread, an internal hexagon 36 is provided on the upper end surface, and a special screw surface 35 for pressing against the assembly is provided on the lower end surface.

[0024] Further, a support rod reference surface I 10 is provided on the upper surface of the installation section 12, and a support rod reference surface III 17 is provided on the lower surface; a support rod reference surface II 13 is provided on the upper surface of the equivalent section 14, and a support rod reference surface IV 18 is provided on the lower surface; the support rod reference surface I 10 matches the lower cushion block reference surface 26 and is used for installing the lower cushion block 3, the balance and rudder 1, the upper cushion block 2, and the pressing block 6. The support rod reference surface III 17 is the installation reference for reverse calibration; the support rod reference surfaces II 13 and IV 18 are used to check whether the wind tunnel balance calibration fixing device is installed in place; a threaded hole II 37 is provided on the central axis of the connecting cone 15 of the calibration support rod and is used for fixing with the calibration mechanism.

[0025] The usage method of the wind tunnel balance calibration fixing device in this embodiment includes the following steps: S10. Use a special bolt to tighten the threaded hole II 37 to fixedly connect the connecting cone 15 to the calibration mechanism. S20. Place the upper cushion block 2 above the balance and rudder 1, so that the upper cushion block surface 21 closely fits the balance and rudder surface I 11, and the pin hole I 19 is vertically aligned with the pin hole III 23, and the pin hole II 20 is vertically aligned with the pin hole IV 24. S30. Place the lower cushion block 3 below the balance and rudder 1, so that the lower cushion block surface 25 closely fits the balance and rudder surface II 16, and the pin hole V 27 is vertically aligned with the pin holes I 19 and III 23, and the pin hole VI 28 is vertically aligned with the pin holes II 20 and IV 24. S40. After pressing and placing the upper cushion block 2, the balance and rudder 1, and the lower cushion block 3 on the installation section 12 of the calibration support rod, closely fit the lower cushion block reference surface 26 with the support rod reference surface I 10, and the pin hole IX 39 is vertically aligned with the pin holes V 27, I 19, and III 23, and the pin hole X 40 is vertically aligned with the pin holes VI 28, II 20, and IV 24. S50. Place the pressing block 6 on the upper cushion block 2, so that the pressing block reference surface II 34 closely fits the upper cushion block reference surface 22, and the pin hole VII 29 is vertically aligned with the pin holes III 23, I 19, V 27, and IX 39, and the pin hole VIII 30 is vertically aligned with the pin holes IV 24, II 20, VI 28, and X 40. S60. Insert the dowel pin Ⅰ4 from top to bottom successively through the pin hole Ⅶ29 of the pressure block 6, the pin hole Ⅲ23 of the upper cushion block 2, the pin hole Ⅰ19 of the balance and rudder 1, the pin hole Ⅴ27 of the lower cushion block 3, and the pin hole Ⅸ39 of the calibration support rod; insert the dowel pin Ⅱ7 from top to bottom successively through the pin hole Ⅷ30 of the pressure block 6, the pin hole Ⅳ24 of the upper cushion block 2, the pin hole Ⅱ20 of the balance and rudder 1, the pin hole Ⅵ28 of the lower cushion block 3, and the pin hole X40 of the calibration support rod. S70. Place the washers 8 respectively on each through hole 32 of the pressure block 6, pass the four groups of bolts 9 through the inner holes of the washers 8 respectively, then place the threaded sections of the bolts 9 from top to bottom into the through holes 32 from the reference surface Ⅰ33 of the pressure block, and then screw them into the threaded hole Ⅲ38 to fix the pressure block 6, the upper cushion block 2, the balance and rudder 1, the lower cushion block 3 and the calibration support rod, and ensure that the reference surface Ⅱ34 of the pressure block is in close contact with the reference surface 22 of the upper cushion block, the surface 21 of the upper cushion block is in close contact with the surface Ⅰ11 of the balance and rudder, the surface 25 of the lower cushion block is in close contact with the surface Ⅱ16 of the balance and rudder, and the reference surface 26 of the lower cushion block is in close contact with the reference surface Ⅰ10 of the support rod. S80. Insert a wrench into the hexagon socket 36, rotate the wrench to screw the special screw 5 into the threaded hole Ⅰ31 until the special screw surface 35 of the special screw 5 presses against the reference surface 22 of the upper cushion block, thereby fixing the pressure block 6, the upper cushion block 2, the balance and rudder 1, the lower cushion block 3 and the calibration support rod. S90. Fine-tune the four groups of bolts 9 and the special screw 5 again to fix the assembly. S100. Check the parallelism between the reference surface Ⅰ33 of the pressure block, the reference surface Ⅱ13 of the support rod and the measuring beam or reference plane on the balance and rudder 1 to ensure that the wind tunnel balance calibration fixing device is installed in place. S110. Rotate the roll device of the calibration mechanism by 180°, check the parallelism between the reference surface Ⅲ17 of the support rod, the reference surface Ⅳ18 of the support rod and the measuring beam or reference plane on the balance and rudder 1 to ensure that the wind tunnel balance calibration fixing device is installed in place in the reverse direction.

[0026] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and embodiments. For those skilled in the art, without departing from the principle of the present invention, all the features disclosed in the present invention, or all the steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any way. The present invention is not limited to the specific details and the illustrated examples here.

Claims

1. A calibration fixing device for a wind tunnel balance, characterized in that The described wind tunnel balance calibration fixture is a combined structure of steel and copper parts, including a balance and rudder (1), upper cushion block (2), lower cushion block (3), pin I (4), special screw (5), pressing block (6), pin II (7), gasket (8), bolt (9) and calibration support rod; The pressing block (6), upper cushion block (2), balance and rudder (1), lower cushion block (3), and calibration support rod are stacked in sequence from top to bottom to form an assembly; the assembly is positioned by pin I (4) and pin II (7) that pass through the pressing block (6), upper cushion block (2), balance and rudder (1), lower cushion block (3), and calibration support rod from top to bottom in sequence, and is fixed by four groups of gaskets (8), bolts (9) distributed circumferentially along the pressing block (6) and the special screw (5) located at the center of the pressing block (6); The balance and rudder (1), pressing block (6), and calibration support rod are steel parts; the upper cushion block (2) and lower cushion block (3) are copper parts; The balance and rudder (1) includes a balance and a rudder connected in sequence from left to right, and the balance and rudder are processed integrally or by split combination; the balance is a hinge balance or a component balance, and the rudder is a regular rudder or an irregular rudder. The regular rudder includes a triangular rudder, a parallelogram rudder, and a rhombic rudder; The lower surface of the upper cushion block (2) is provided with an upper cushion block profile surface (21) that matches the upper surface of the balance and rudder (1), and the upper surface of the upper cushion block (2) is provided with an upper cushion block reference surface (22) that matches the lower surface of the pressing block (6), and the remaining surfaces are flat; The upper surface of the lower cushion block (3) is provided with a lower cushion block profile surface (25) that matches the lower surface of the balance and rudder (1), and the lower surface of the lower cushion block (3) is provided with a lower cushion block reference surface (26) that matches the support rod reference surface I (10), and the remaining surfaces are flat; The calibration support rod includes an installation section (12), a straight section (14), and a connection cone (15) connected in sequence from front to back.

2. The wind tunnel balance calibration fixing device according to claim 1, characterized in that The upper surface of the rudder of the described balance and rudder (1) is provided with a balance and rudder profile surface I (11), and the lower surface is provided with a balance and rudder profile surface II (16); vertical pin holes I (19) and pin holes II (20) that penetrate up and down are provided on the rudder of the balance and rudder (1).

3. The wind tunnel balance calibration fixing device according to claim 2, wherein, Vertical pin holes III (23) and pin holes IV (24) that penetrate up and down are provided on the upper cushion block (2).

4. The wind tunnel balance calibration fixing device according to claim 3, characterized in that Vertical pin holes V (27) and pin holes VI (28) are provided on the lower cushion block (3).

5. The wind tunnel balance calibration fixing device according to claim 4, characterized in that The pressing block (6) is a square block, provided with pin holes VII (29) and pin holes VIII (30); the upper surface is provided with a pressing block reference surface I (33), and the lower surface is provided with a pressing block reference surface II (34); the pin holes VII (29) and pin holes VIII (30) are used for the installation and positioning of the assembly, the pressing block reference surface I (33) assists in the installation of the assembly, and the pressing block reference surface II (34) matches the upper cushion block reference surface (22) of the upper cushion block (2).

6. The wind tunnel balance calibration fixing device according to claim 5, characterized in that The special screw (5) is provided with an external thread, the upper end surface is provided with an internal hexagon (36), and the lower end surface is provided with a special screw surface (35) for pressing against the assembly.

7. The wind tunnel balance calibration fixing device according to claim 6, wherein, The upper surface of the described installation section (12) is provided with a strut reference plane I (10), and the lower surface is provided with a strut reference plane III (17); the upper surface of the equivalent section (14) is provided with a strut reference plane II (13), and the lower surface is provided with a strut reference plane IV (18); the strut reference plane I (10) matches the lower pad reference plane (26) and is used for installing the lower pad (3), the balance and rudder (1), the upper pad (2) and the pressing block (6), and the strut reference plane III (17) is the installation reference for reverse calibration; the strut reference plane II (13) and the strut reference plane IV (18) are used to check whether the wind tunnel balance calibration fixing device is installed in place; a threaded hole II (37) is arranged on the central axis of the connecting cone (15) of the calibration strut and is used for fixing with the calibration mechanism.

8. A method of using a calibration fixing device for a wind tunnel balance, which is used for the wind tunnel balance calibration fixing device according to claim 7, characterized in that, It includes the following steps: S10. Use a special bolt to tighten the threaded hole II (37) to fixedly connect the connecting cone (15) to the calibration mechanism; S20. Place the upper pad (2) above the balance and rudder (1) so that the upper pad surface (21) is in close contact with the balance and rudder surface I (11), and the pin hole I (19) is vertically aligned with the pin hole III (23), and the pin hole II (20) is vertically aligned with the pin hole IV (24); S30. Place the lower pad (3) below the balance and rudder (1) so that the lower pad surface (25) is in close contact with the balance and rudder surface II (16), and the pin hole V (27) is vertically aligned with the pin hole I (19) and the pin hole III (23), and the pin hole VI (28) is vertically aligned with the pin hole II (20) and the pin hole IV (24); S40. After pressing and placing the upper pad (2), the balance and rudder (1), and the lower pad (3) on the installation section (12) of the calibration strut, make the lower pad reference plane (26) in close contact with the strut reference plane I (10), and the pin hole IX (39) is vertically aligned with the pin hole V (27), the pin hole I (19), and the pin hole III (23), and the pin hole X (40) is vertically aligned with the pin hole VI (28), the pin hole II (20), and the pin hole IV (24); S50. Place the pressing block (6) on the upper pad (2), make the pressing block reference plane II (34) in close contact with the upper pad reference plane (22), and the pin hole VII (29) is vertically aligned with the pin hole III (23), the pin hole I (19), the pin hole V (27), and the pin hole IX (39), and the pin hole VIII (30) is vertically aligned with the pin hole IV (24), the pin hole II (20), the pin hole VI (28), and the pin hole X (40); S60. Pass the pin I (4) through the pin hole VII (29) of the pressing block (6), the pin hole III (23) of the upper pad (2), the pin hole I (19) of the balance and rudder (1), the pin hole V (27) of the lower pad (3), and the pin hole IX (39) of the calibration strut from top to bottom in sequence; pass the pin II (7) through the pin hole VIII (30) of the pressing block (6), the pin hole IV (24) of the upper pad (2), the pin hole II (20) of the balance and rudder (1), the pin hole VI (28) of the lower pad (3), and the pin hole X (40) of the calibration strut from top to bottom in sequence; S70. Place gaskets (8) on each through hole (32) of the briquetting block (6). Pass four groups of bolts (9) through the inner holes of the gaskets (8) respectively. Then, place the threaded sections of the bolts (9) into the through holes (32) from top to bottom from the reference surface I (33) of the briquetting block, and then screw them into the threaded holes III (38) to fix the briquetting block (6), the upper cushion block (2), the balance and rudder (1), the lower cushion block (3) and the calibration support rod, and ensure that the reference surface II (34) of the briquetting block is in close contact with the reference surface (22) of the upper cushion block, the surface (21) of the upper cushion block is in close contact with the surface I (11) of the balance and rudder, the surface (25) of the lower cushion block is in close contact with the surface II (16) of the balance and rudder, and the reference surface (26) of the lower cushion block is in close contact with the reference surface I (10) of the support rod; S80. Insert a wrench into the hexagon socket (36), rotate the wrench to screw the special screw (5) into the threaded hole I (31) until the special screw surface (35) of the special screw (5) abuts against the reference surface (22) of the upper cushion block, thereby fixing the briquetting block (6), the upper cushion block (2), the balance and rudder (1), the lower cushion block (3) and the calibration support rod; S90. Fine-tune the four groups of bolts (9) and the special screw (5) again to fix the assembly; S100. Check the parallelism between the reference surface I (33) of the briquetting block, the reference surface II (13) of the support rod and the measuring beam or reference plane on the balance and rudder (1) to ensure that the wind tunnel balance calibration fixing device is installed in place; S110. Rotate the roll device of the calibration mechanism by 180°, check the parallelism between the reference surface III (17) of the support rod, the reference surface IV (18) of the support rod and the measuring beam or reference plane on the balance and rudder (1) to ensure that the wind tunnel balance calibration fixing device is installed in place in the reverse direction.

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