Balance high-precision deformation measuring device and measuring method based on binocular vision

Abstract

The invention belongs to the technical field of high-speed wind tunnel tests, and discloses a balance high-precision deformation measuring device and method based on binocular vision. According to the measuring device, a balance to be measured is fixed on the upper surface of a seismic isolation table through a balance supporting mechanism, and a binocular vision camera system is fixed through a binocular vision system supporting mechanism; the binocular vision camera system shoots the balance to be measured. The measuring method comprises the steps of shooting mark point images; initially positioning edge points; carrying out sub-pixel edge detection; carrying out least square fitting on the edge points; carrying out secondary fitting on the edge points; calculating the deformation of the measured balance; and judging whether to replace the measured balance. According to the balance high-precision deformation measuring device and method based on binocular vision, high-precision measurement of balance deformation is achieved on the premise that the balance is not damaged, and technical guarantee is provided for reliable application of a high-speed wind tunnel balance.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-speed wind tunnel tests, and particularly relates to a high-precision deformation measurement device and method for a balance based on binocular vision. Background Art

[0002] Currently, in high-speed wind tunnel tests, when plastic deformation occurs or cracks appear in the structural components of the balance, the balance signal will be abnormal. It is extremely time-consuming and laborious to determine whether the balance has deformed, whether it can continue to be used, and whether manual calibration needs to be repeated by collecting signal data. Once it is not timely determined that the data abnormality is caused by the balance, it is easy to spend a lot of time checking each system related to the high-speed wind tunnel one by one, resulting in a long interruption of the high-speed wind tunnel test and affecting the quality and efficiency of the high-speed wind tunnel test.

[0003] Currently, there is an urgent need to develop a high-precision deformation measurement device and method for a balance based on binocular vision. Summary of the Invention

[0004] One technical problem to be solved by the present invention is to provide a high-precision deformation measurement device for a balance based on binocular vision, and another technical problem to be solved by the present invention is to provide a high-precision deformation measurement method for a balance based on binocular vision to overcome the defects of the prior art.

[0005] In the high-precision deformation measurement device for a balance based on binocular vision of the present invention, the balance to be measured is fixed on the upper surface of the vibration isolation table through a balance support mechanism, and the binocular vision camera system is fixed through a binocular vision system support mechanism; The balance support mechanism includes a horizontal balance bracket, and a balance roll angle adjustment block is fixed at the rear end of the balance bracket; the balance to be measured is a rod balance, the rear end of the balance to be measured is a fixed end and is inserted into the balance roll angle adjustment block; the front end of the balance to be measured is a suspended end, and the rod body is suspended above the balance bracket; The binocular vision system support mechanism includes a lateral displacement stage and a vertical displacement stage; the lateral displacement stage is parallel to the balance bracket, a vertical displacement stage is fixed on the lateral displacement stage, and the binocular vision camera system is fixed on the vertical displacement stage, and the binocular vision camera system photographs the balance to be measured; Marking points are pasted on the balance to be measured, the marking points are circular dots, and the diameter range of the circular dots is 1 mm to 3 mm.

[0006] Furthermore, the vibration isolation table is a damping optical vibration isolation table, the material is stainless steel, the tabletop of the vibration isolation table is a three-layer sandwich honeycomb structure, the upper surface of the tabletop is subjected to a matte treatment with a Midi pattern, and a polymer composite damping rubber vibration isolation pad is arranged at the bottom of the tabletop; the amplitude of the vibration isolation table is less than 4 μm, and the flatness is 0.02 - 0.05 mm / m 2 .

[0007] Further, the balance support includes a positioning block and a balance horizontal support plate that are sequentially connected from front to back, and the balance horizontal support plate is connected to the balance roll angle adjustment block; The positioning block is provided with a plurality of threaded holes I corresponding to the screw holes on the surface of the vibration isolation table, and the positioning block is fixed by bolts that penetrate the threaded holes I from top to bottom and insert into the screw holes on the surface of the vibration isolation table; The balance roll angle adjustment block is provided with a plurality of threaded holes VI corresponding to the screw holes on the surface of the vibration isolation table, and the balance roll angle adjustment block is fixed by bolts that penetrate the threaded holes VI from top to bottom and insert into the screw holes on the surface of the vibration isolation table; A flange is fixed on the rear end face of the balance adapter, and a plurality of flange holes are provided in the circumferential direction of the flange. The balance adapter is fixed on the front end face of the balance roll angle adjustment block by screws passing through the flange holes; A tapered hole is provided on the front end face of the balance adapter, and the tapered section at the rear end of the measured balance is inserted into the tapered hole for fixation; The balance roll angle adjustment block adjusts the roll angle of the measured balance.

[0008] Further, the lateral displacement table is a horizontal square flat plate; The edge of the lateral displacement table is provided with a plurality of threaded holes VII corresponding to the screw holes on the surface of the vibration isolation table, and the lateral displacement table is fixed by bolts that penetrate the threaded holes VII from top to bottom and insert into the screw holes on the surface of the vibration isolation table; A protruding lateral displacement table guide rail is provided on the horizontal central axis of the lateral displacement table, and sunken lateral displacement table card slots are provided on both sides of the lateral displacement table guide rail; The vertical displacement table is a vertical square flat plate; Reinforcing ribs are provided on the back of the vertical displacement table; A plurality of threaded holes II are provided on the edge of the vertical displacement table; The lower end of the vertical displacement table is mounted on the lateral displacement table guide rail and the lateral displacement table card slot of the lateral displacement table through slider II, and the vertical displacement table moves back and forth along the lateral displacement table guide rail and the lateral displacement table card slot through slider II, and is positioned and fixed by tightening the positioning bolts matching the lateral displacement table card slot of slider II; The front face of the vertical displacement table faces the balance support, and a protruding vertical displacement table guide rail is provided on the vertical central axis of the front face of the vertical displacement table, and sunken vertical displacement table card slots are provided on both sides of the vertical displacement table guide rail; Slider I is mounted on the vertical displacement table guide rail and the vertical displacement table card slot, and slider I moves up and down along the vertical displacement table guide rail and the vertical displacement table card slot. Threaded hole III is provided on slider I, and threaded hole III corresponds to threaded hole II; The slider I is assisted to be fixed by tightening the positioning screws on the slider I that match the vertical displacement table card slot.

[0009] Further, the binocular vision camera system is fixedly installed through an L-shaped binocular vision camera support; The vertical plate of the binocular vision camera support matches the front end face of slider I, and threaded hole IV is provided on the vertical plate, and threaded hole IV matches threaded hole III on slider I. The binocular vision camera support is fixed by a bolt assembly passing through threaded hole IV, threaded hole III, and threaded hole II; The front end of the horizontal plate of the L-shaped binocular vision camera bracket is connected to the telescopic connecting plate of the camera bracket by means of fixing with track clamping screws; the lower surface of the front end of the telescopic connecting plate of the camera bracket is connected to the cross beam by means of fixing with track clamping screws; the cross beam is parallel to the balance to be measured, and the front end face of the cross beam fixes the front mounting plate of the camera bracket. A number of threaded holes Ⅴ are provided on the front mounting plate of the camera bracket. The right camera and the left camera are fixed on the cross beam by screws screwed into the threaded holes Ⅴ. A strip light source is provided on the central axis of the lower surface of the cross beam, and a data acquisition module is provided on the upper surface of the cross beam. The right camera and the left camera are respectively connected to the data acquisition module by cables, and the data acquisition module is connected to the computer by a cable; the images captured by the right camera and the left camera are transmitted to the computer through the data acquisition module. The binocular vision camera system moves forward and backward through the slider Ⅱ, moves up and down through the slider Ⅰ, and moves left and right through the telescopic connecting plate of the camera bracket; it also supplements the forward and backward movement through the cross beam, and the telescopic connecting plate of the camera bracket supplements the left and right movement.

[0010] The high-precision deformation measurement method of the balance based on binocular vision of the present invention includes the following steps: S10. Take images of the marked points; The right camera and the left camera synchronously collect the images of the marked points of the balance to be measured, match the marked points with the digital model of the balance to be measured, and obtain the model coordinates of the marked points. S20. Initial positioning of edge points; The Canny pixel edge detection algorithm is used to process the grayscale images captured by the right camera and the left camera to obtain edge points with 1 pixel point as the basic unit, which are defined as roughly positioned edge points. S30. Sub-pixel edge detection; The gradient amplitude mean method is used to improve the accuracy of the edge from 1 pixel point to 0.1 pixel point to obtain precisely positioned edge points. S40. Least square fitting of edge points; Use the following general equation of a plane ellipse to fit the ellipse to obtain the parameters B, C, D, E, F: ; Calculate the ellipse center coordinates according to the following formula: ; Among them, x , y are respectively the horizontal and vertical coordinate values of a point on the ellipse; x 0 , y 0 are respectively the horizontal and vertical coordinate values of the ellipse center; S50. Secondary fitting of edge points; After the first fitting, calculate the residuals of each edge point. According to the preset residual threshold, remove the edge points that exceed the residual threshold, and then perform a second least squares fitting on the remaining edge points to obtain the edge point image. S60. Calculate the deformation amount of the balance to be measured. Compare the original image at the marked points of the balance to be measured with the dot image composed of the edge points of the marked points, and calculate the deformation amount of the balance to be measured. S70. Determine whether to replace the balance to be measured. If the deformation amount exceeds 5 μm, it is determined that the structural components of the balance to be measured have undergone plastic deformation or cracks, and it is necessary to suspend the high-speed wind tunnel test and replace the balance to be measured.

[0011] Furthermore, the gradient magnitude mean method includes the following steps: S31. Calculate the gradient magnitude along the gradient direction on the roughly located edge points ; S32. Under the preset threshold , determine the value range of the precisely located edge points that satisfy the gradient magnitude ; S33. Take the gradient components and as weights, and according to the following sub-pixel correction formula for the edge position along the gradient direction, obtain the position of the precisely located edge points: ; where and are the distance components of a pixel point along the gradient direction from the roughly located edge point; and are the gradient components of a pixel point along the gradient direction from the roughly located edge point; is the number of pixel points along the gradient direction; is for x the sub-pixel variable value of the edge position along the gradient direction, is for y the sub-pixel variable value of the edge position along the gradient direction; Let the roughly located edge point be , and the gradient direction be , then when , the next two points for calculating the gradient magnitude along the gradient direction are and , where , .

[0012] The high-precision deformation measurement device and method for a balance based on binocular vision of the present invention achieve high-precision measurement of the balance deformation without damaging the balance, providing technical support for the reliable application of high-speed wind tunnel balances. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the high-precision deformation measurement device for a balance based on binocular vision of the present invention; Figure 2 It is a schematic structural diagram of the balance support mechanism in the high-precision deformation measurement device for a balance based on binocular vision of the present invention; Figure 3 It is a schematic structural diagram of the binocular vision system support mechanism in the high-precision deformation measurement device for a balance based on binocular vision of the present invention; Figure 4 It is a schematic structural diagram of the binocular vision system in the high-precision deformation measurement device for a balance based on binocular vision of the present invention; Figure 5 It is a marked point image obtained by the high-precision deformation measurement method for a balance based on binocular vision of the present invention; Figure 6 It is a fitted ellipse obtained by the high-precision deformation measurement method for a balance based on binocular vision of the present invention; Figure 6 In, the red circle is the fitted ellipse of the edge points of the circular mark image, and the red central dot is the center of the fitted ellipse; Figure 7 It is an edge point image obtained by the high-precision deformation measurement method for a balance based on binocular vision of the present invention; Figure 8 It is a schematic diagram of the principle of the gradient amplitude mean method adopted by the high-precision deformation measurement method for a balance based on binocular vision of the present invention.

[0014] In the figure, 1. Tested balance; 2. Vibration isolation table; 3. Balance support; 4. Balance roll angle adjustment block; 5. Horizontal displacement table; 6. Vertical displacement table; 7. Binocular vision camera system; 8. Balance horizontal support plate; 9. Balance adapter; 10. Taper hole; 11. Flange hole; 12. Flange; 13. Threaded hole Ⅰ; 14. Positioning bolt; 15. Horizontal displacement table guide rail; 16. Vertical displacement table guide rail; 17. Threaded hole Ⅱ; 18. Slide block Ⅰ; 19. Positioning screw; 20. Threaded hole Ⅲ; 21. Binocular vision camera support; 22. Threaded hole Ⅳ; 23. Strip light source; 24. Data acquisition module; 25. Right camera; 26. Left camera; 27. Threaded hole Ⅴ; 28. Front mounting plate of the camera support; 29. Computer; 30. Telescopic connecting plate of the camera support; 31. Cross beam; 32. Threaded hole Ⅵ; 33. Positioning block; 34. Threaded hole Ⅶ; 35. Slide block Ⅱ; 36. Horizontal displacement table card slot; 37. Vertical displacement table card slot. Detailed implementation mode

[0015] The following uses specific specific examples to illustrate the implementation mode of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0016] Example: As Figure 1 shown, the high-precision deformation measurement device of the balance based on binocular vision in this embodiment fixes the measured balance 1 on the upper surface of the vibration isolation table 2 through the balance support mechanism, and fixes the binocular vision camera system 7 through the binocular vision system support mechanism; The balance support mechanism includes a horizontal balance bracket 3, and a balance roll angle adjustment block 4 is fixed at the rear end of the balance bracket 3; the measured balance 1 is a lever balance, the rear end of the measured balance 1 is a fixed end and is inserted into the balance roll angle adjustment block 4; the front end of the measured balance 1 is a suspended end, and the rod body is suspended above the balance bracket 3; The binocular vision system support mechanism includes a horizontal displacement stage 5 and a vertical displacement stage 6; the horizontal displacement stage 5 is parallel to the balance bracket 3, a vertical displacement stage 6 is fixed on the horizontal displacement stage 5, and a binocular vision camera system 7 is fixed on the vertical displacement stage 6, and the binocular vision camera system 7 photographs the measured balance 1; Marking points are pasted on the measured balance 1, the marking points are round dots, and the diameter range of the round dots is 1 mm to 3 mm.

[0017] Furthermore, the vibration isolation table 2 is a damping optical vibration isolation table, the material is stainless steel, the table top of the vibration isolation table 2 is a three-layer sandwich honeycomb structure, the upper surface of the table top is subjected to a Midi pattern matte treatment, and a polymer composite damping rubber vibration isolation pad is arranged at the bottom of the table top; the amplitude of the vibration isolation table 2 is less than 4 μm, and the flatness is 0.02 to 0.05 mm / m 2 .

[0018] Furthermore, as Figure 2 shown, the balance bracket 3 includes a positioning block 33 and a balance horizontal support plate 8 connected in sequence from front to back, and the balance horizontal support plate 8 is connected to the balance roll angle adjustment block 4; A plurality of threaded holes I 13 corresponding to the screw holes on the table top of the vibration isolation table 2 are arranged on the positioning block 33, and the positioning block 33 is fixed by bolts passing through the threaded holes I 13 from top to bottom and inserted into the screw holes on the table top of the vibration isolation table 2; On the balance roll angle adjusting block 4, there are several threaded holes Ⅵ32 corresponding to the screw holes on the tabletop of the vibration isolation table 2. The balance roll angle adjusting block 4 is fixed by bolts that pass through the threaded holes Ⅵ32 from top to bottom and insert into the screw holes on the tabletop of the vibration isolation table 2. On the rear end face of the balance adapter 9, a flange 12 is fixed. Several flange holes 11 are arranged circumferentially on the flange 12. The balance adapter 9 is fixed on the front end face of the balance roll angle adjusting block 4 by screws passing through the flange holes 11. On the front end face of the balance adapter 9, a tapered hole 10 is provided. The tapered section at the rear end of the measured balance 1 is inserted into the tapered hole 10 for fixation. The balance roll angle adjusting block 4 adjusts the roll angle of the measured balance 1.

[0019] Furthermore, as Figure 3 shown, the lateral displacement table 5 is a horizontal square flat plate. Several threaded holes Ⅶ34 corresponding to the screw holes on the tabletop of the vibration isolation table 2 are arranged on the edge of the lateral displacement table 5. The lateral displacement table 5 is fixed by bolts that pass through the threaded holes Ⅶ34 from top to bottom and insert into the screw holes on the tabletop of the vibration isolation table 2. On the horizontal central axis of the lateral displacement table 5, a protruding lateral displacement table guide rail 15 is provided. On both sides of the lateral displacement table guide rail 15, sunken lateral displacement table card slots 36 are provided. The vertical displacement table 6 is a vertical square flat plate. Reinforcing ribs are provided on the back of the vertical displacement table 6. Several threaded holes Ⅱ17 are arranged on the edge of the vertical displacement table 6. The lower end of the vertical displacement table 6 is installed on the lateral displacement table guide rail 15 and the lateral displacement table card slot 36 of the lateral displacement table 5 through a slider Ⅱ35. The vertical displacement table 6 moves back and forth along the lateral displacement table guide rail 15 and the lateral displacement table card slot 36 through the slider Ⅱ35, and is positioned and fixed by tightening the positioning bolt 14 that matches the lateral displacement table card slot 36. The front of the vertical displacement table 6 faces the balance support 3. On the vertical central axis of the front of the vertical displacement table 6, a protruding vertical displacement table guide rail 16 is provided. On both sides of the vertical displacement table guide rail 16, sunken vertical displacement table card slots 37 are provided. The slider Ⅰ18 is installed on the vertical displacement table guide rail 16 and the vertical displacement table card slot 37. The slider Ⅰ18 moves up and down along the vertical displacement table guide rail 16 and the vertical displacement table card slot 37. Threaded holes Ⅲ20 are provided on the slider Ⅰ18, and the threaded holes Ⅲ20 correspond to the threaded holes Ⅱ17. The slider Ⅰ18 is assisted in fixation by tightening the positioning screw 19 that matches the vertical displacement table card slot 37 on the slider Ⅰ18.

[0020] Furthermore, as Figure 4 shown, the binocular vision camera system 7 is fixedly installed through an L-shaped binocular vision camera bracket 21. The vertical plate of the binocular vision camera bracket 21 matches the front end face of the slider I 18. Threaded holes IV 22 are provided on the vertical plate, and the threaded holes IV 22 match the threaded holes III 20 on the slider I 18. The binocular vision camera bracket 21 is fixed by a bolt assembly passing through the threaded holes IV 22, threaded holes III 20, and threaded holes II 17; The front end of the horizontal plate of the L-shaped binocular vision camera bracket 21 is connected to the camera bracket telescopic connection plate 30 by means of fixing with track mounting screws; the lower surface of the front end of the camera bracket telescopic connection plate 30 is connected to the cross beam 31 by means of fixing with track mounting screws; the cross beam 31 is parallel to the measured weighing scale 1, and the front end face of the cross beam 31 is fixed with a camera bracket front mounting plate 28. A number of threaded holes V 27 are provided on the camera bracket front mounting plate 28. The right camera 25 and the left camera 26 are fixed to the cross beam 31 by screws screwed into the threaded holes V 27; A strip light source 23 is provided on the central axis of the lower surface of the cross beam 31, and a data acquisition module 24 is provided on the upper surface of the cross beam 31. The right camera 25 and the left camera 26 are respectively connected to the data acquisition module 24 by cables, and the data acquisition module 24 is connected to the computer 29 by a cable; the images captured by the right camera 25 and the left camera 26 are transmitted to the computer 29 through the data acquisition module 24; The binocular vision camera system 7 moves forward and backward through the slider II 35, moves up and down through the slider I 18, and moves left and right through the camera bracket telescopic connection plate 30; it also supplements the forward and backward movement through the cross beam 31, and the camera bracket telescopic connection plate 30 supplements the left and right movement.

[0021] The high-precision deformation measurement method of the weighing scale based on binocular vision in this embodiment includes the following steps: S10. Capture the marked point image; The right camera 25 and the left camera 26 synchronously collect the marked point image of the measured weighing scale 1 as Figure 5 shown, match the marked points with the digital model of the measured weighing scale 1, and obtain the model coordinates of the marked points; S20. Initial positioning of edge points; Using the Canny pixel edge detection algorithm, process the grayscale images captured by the right camera 25 and the left camera 26 to obtain edge points with 1 pixel point as the basic unit, defined as roughly positioned edge points; S30. Sub-pixel edge detection; Using the gradient amplitude mean method, improve the accuracy of the edge from 1 pixel point to 0.1 pixel point to obtain precisely positioned edge points; S40. Least squares fitting of edge points; As Figure 6 shown, use the following general equation of a plane ellipse to fit the ellipse and obtain the parameters B, C, D, E, F: ; Calculate the coordinates of the ellipse center according to the following formula: ; wherein, x and y are respectively the horizontal and vertical coordinate values of a point on the ellipse; x 0 and y 0 are respectively the horizontal and vertical coordinate values of the ellipse center; S50. Quadratic fitting of edge points; After the first fitting, calculate the residual of each edge point, remove the edge points exceeding the preset residual threshold, and then perform a second least squares fitting on the remaining edge points to obtain an edge point image as Figure 7 shown; S60. Calculate the deformation of the balance 1 to be measured; Compare the original image at the marked points of the balance 1 to be measured with the dot image composed of the edge points of the marked points, and calculate the deformation of the balance 1 to be measured; S70. Determine whether to replace the balance 1 to be measured; If the deformation exceeds 5 μm, it is determined that the structural components of the balance 1 to be measured have undergone plastic deformation or cracks, and it is necessary to suspend the high-speed wind tunnel test and replace the balance 1 to be measured.

[0022] Furthermore, the gradient amplitude mean method includes the following steps: S31. Calculate the gradient amplitude along the gradient direction at the roughly located edge points ; S32. Determine the value range of the accurately located edge points that satisfy the gradient amplitude under the preset threshold ; S33. Take the gradient components and as weights, and according to the following edge position sub-pixel correction formula along the gradient direction, obtain the position of the accurately located edge points: ; wherein, and are the distance components of a pixel point along the gradient direction from the roughly located edge point; and are the gradient components of a pixel point along the gradient direction from the roughly located edge point; is the number of pixel points along the gradient direction; is x the sub-pixel variable value of the edge position along the gradient direction, is ySub-pixel variable value of the edge position in the gradient direction; As Figure 8 shown, let the roughly located edge point be , the gradient direction be , then when , the next two points for calculating the gradient magnitude along the gradient direction are and , where , .

[0023] The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A high-precision deformation measuring device based on binocular vision, characterized in that: The measuring device fixes the measured balance (1) on the upper surface of the seismic isolation platform (2) via a balance support mechanism, and fixes the binocular vision camera system (7) via a binocular vision system support mechanism; The balance support mechanism comprises a horizontal balance support (3), the rear end of which is fixed with a balance roll angle adjustment block (4); the measured balance (1) is a rod-type balance, the rear end of which is a fixed end, into which the balance roll angle adjustment block (4) is inserted; the front end of the measured balance (1) is a suspended end, and the rod body is suspended above the balance support (3); The binocular vision system support mechanism comprises a lateral displacement platform (5) and a vertical displacement platform (6); the lateral displacement platform (5) is parallel to the balance support (3), a vertical displacement platform (6) is fixed on the lateral displacement platform (5), a binocular vision camera system (7) is fixed on the vertical displacement platform (6), and the binocular vision camera system (7) photographs the measured balance (1); The measured balance (1) is pasted with a marking point, which is a round dot with a diameter ranging from 1 mm to 3 mm.

2. The high-precision deformation measuring device based on binocular vision according to claim 1 is characterized in that: The isolation platform (2) is a damped optical isolation platform, made of stainless steel. The table top of the isolation platform (2) is a three-layer sandwich honeycomb structure. The upper surface of the table top is treated with a matte finish. A polymer composite damping rubber isolation pad is arranged at the bottom of the table top. The amplitude of the isolation platform (2) is less than 4 μm, and the flatness is 0.02-0.05 mm / m. 2 .

3. The high-precision deformation measuring device based on binocular vision according to claim 2 is characterized in that: The balance support (3) comprises a positioning block (33) and a balance horizontal support plate (8) which are sequentially connected from front to back, and the balance horizontal support plate (8) is connected to the balance roll angle adjustment block (4); The positioning block (33) is provided with a plurality of threaded holes I (13) corresponding to the screw holes on the table top of the seismic isolation table (2), and the positioning block (33) is fixed by bolts that penetrate the threaded holes I (13) from top to bottom and are inserted into the screw holes on the table top of the seismic isolation table (2); The balance roll angle adjustment block (4) is provided with a plurality of threaded holes VI (32) corresponding to the screw holes on the table top of the isolation table (2); the balance roll angle adjustment block (4) is fixed by bolts that penetrate the threaded holes VI (32) from top to bottom and are inserted into the screw holes on the table top of the isolation table (2); a flange (12) is fixed on the rear end surface of the balance adapter (9); a plurality of flange holes (11) are provided in the circumferential direction of the flange (12); the balance adapter (9) is fixed to the front end surface of the balance roll angle adjustment block (4) by screws that pass through the flange holes (11); a tapered hole (10) is provided on the front end surface of the balance adapter (9); the tapered section at the rear end of the measured balance (1) is inserted into the tapered hole (10) and fixed; The balance roll angle adjustment block (4) adjusts the roll angle of the measured balance (1).

4. The high-precision deformation measuring device based on binocular vision according to claim 3 is characterized in that: The lateral displacement platform (5) is a horizontal square flat plate; a plurality of threaded holes VII (34) corresponding to the screw holes on the surface of the seismic isolation platform (2) are arranged on the edge of the lateral displacement platform (5); the lateral displacement platform (5) is fixed by bolts that penetrate the threaded holes VII (34) from top to bottom and are inserted into the screw holes on the surface of the seismic isolation platform (2); a protruding lateral displacement platform guide rail (15) is arranged on the horizontal central axis of the lateral displacement platform (5), and recessed lateral displacement platform slots (36) are arranged on both sides of the lateral displacement platform guide rail (15); The vertical displacement platform (6) is a vertical square flat plate; a reinforcing rib is arranged on the back of the vertical displacement platform (6); a plurality of threaded holes II (17) are arranged on the edge of the vertical displacement platform (6); the lower end of the vertical displacement platform (6) is clamped on the lateral displacement platform guide rail (15) and the lateral displacement platform slot (36) of the lateral displacement platform (5) through a slider II (35); the vertical displacement platform (6) moves forward and backward along the lateral displacement platform guide rail (15) and the lateral displacement platform slot (36) through the slider II (35), and is positioned and fixed by tightening the positioning bolts (14) matching the slider II (35) and the lateral displacement platform slot (36); the front side of the vertical displacement platform (6) faces the balance bracket (3), A protruding vertical displacement platform guide rail (16) is arranged on the vertical center axis of the front side of the vertical displacement platform (6), and recessed vertical displacement platform slots (37) are arranged on both sides of the vertical displacement platform guide rail (16); a slider I (18) is mounted on the vertical displacement platform guide rail (16) and the vertical displacement platform slot (37), and the slider I (18) moves up and down along the vertical displacement platform guide rail (16) and the vertical displacement platform slot (37); a threaded hole III (20) is arranged on the slider I (18), and the threaded hole III (20) corresponds to the threaded hole II (17); and the slider I (18) is auxiliary fixed by tightening a positioning screw (19) on the slider I (18) that matches the vertical displacement platform slot (37).

5. The high-precision deformation measuring device based on binocular vision according to claim 4 is characterized in that: The binocular vision camera system (7) is fixedly installed via an L-shaped binocular vision camera bracket (21); The vertical plate of the binocular vision camera bracket (21) matches the front end surface of the slider I (18), and a threaded hole IV (22) is provided on the vertical plate. The threaded hole IV (22) matches the threaded hole III (20) on the slider I (18), and the binocular vision camera bracket (21) is fixed by a bolt assembly penetrating the threaded hole IV (22), the threaded hole III (20) and the threaded hole II (17); The front end of the horizontal plate of the L-shaped binocular vision camera bracket (21) is connected to the camera bracket telescopic connecting plate (30) by means of track-mounted screws; the lower surface of the front end of the camera bracket telescopic connecting plate (30) is connected to the crossbeam (31) by means of track-mounted screws; the crossbeam (31) is parallel to the measured balance (1); the front end surface of the crossbeam (31) is fixed to the camera bracket front mounting plate (28); a plurality of threaded holes V (27) are provided on the camera bracket front mounting plate (28); the right camera (25) and the left camera (26) are fixed to the crossbeam (31) by screws screwed into the threaded holes V (27); A strip light source (23) is arranged on the central axis of the lower surface of the crossbeam (31); a data acquisition module (24) is arranged on the upper surface of the crossbeam (31); the right camera (25) and the left camera (26) are respectively connected to the data acquisition module (24) via cables; the data acquisition module (24) and the computer (29) are connected via cables; images captured by the right camera (25) and the left camera (26) are transmitted to the computer (29) via the data acquisition module (24); The binocular vision camera system (7) is moved forward and backward by means of a slider II (35), is moved up and down by means of a slider I (18), and is moved left and right by means of a telescopic connecting plate (30) of a camera bracket. The forward and backward movement is supplemented by means of a crossbeam (31), and the left and right movement is supplemented by means of a telescopic connecting plate (30) of a camera bracket.

6. A high-precision deformation measurement method based on binocular vision for a balance, which is used in the high-precision deformation measurement device based on binocular vision of claim 5, characterized in that: The measuring method comprises the following steps: S10. Take a mark point image; The right camera (25) and the left camera (26) synchronously capture images of the marking points of the measured balance (1), match the marking points with the digital model of the measured balance (1), and obtain the model coordinates of the marking points; S20. Initial positioning of edge points; Using the Canny pixel edge detection algorithm, the grayscale images captured by the right camera (25) and the left camera (26) are processed to obtain edge points with 1 pixel as a basic unit, which are defined as coarse positioning edge points; S30. Sub-pixel edge detection; The gradient amplitude mean method is used to improve the edge accuracy from 1 pixel to 0.1 pixel, and the edge points are precisely located. S40. Least squares fitting of edge points; Use the following general equation of a plane ellipse to fit the ellipse and obtain the parameters B, C, D, E, and F: ； The coordinates of the center of the ellipse are calculated according to the following formula: ； in, x , y are the horizontal and vertical coordinates of a point on the ellipse respectively; x 0. y 0 is the horizontal and vertical coordinate value of the center of the ellipse; S50. quadratic fitting of edge points; After the first fitting, the residual of each edge point is calculated, and the edge points exceeding the residual threshold are removed according to the preset residual threshold, and then the second least squares fitting is performed on the remaining edge points to obtain the edge point image; S60. Calculate the deformation of the measured balance (1); Compare the original image of the measured balance (1) at the marked point with the dot image composed of the edge points of the marked point, and calculate the deformation of the measured balance (1); S70. Determine whether to replace the measured balance (1); If the deformation exceeds 5 μm, it is determined that the structural element of the measured balance (1) has undergone plastic deformation or cracks, and it is necessary to suspend the high-speed wind tunnel test and replace the measured balance (1).

7. The high-precision deformation measurement method based on binocular vision of a balance according to claim 6, characterized in that: The gradient amplitude mean method comprises the following steps: S31. Calculate the gradient amplitude along the gradient direction at the roughly located edge point ; S32. At a preset threshold Under this condition, determine the gradient amplitude The value interval of the precisely positioned edge points; S33. The gradient component and As the weight, according to the following edge position sub-pixel correction formula along the gradient direction, the precise edge point position is obtained: ； in, and is the distance component between a pixel point and the roughly located edge point along the gradient direction; and is the gradient component of a pixel point along the gradient direction and the roughly located edge point; is the number of pixels along the gradient direction; For along x Sub-pixel variable value of edge position in gradient direction, For along y Sub-pixel variable value of edge position in gradient direction; Let the coarse positioning edge point be , the gradient direction is , then when When , the next two points along the gradient direction where the gradient magnitude is calculated are and ,in , .

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