Light-speed-adjustable laser interference system applied to turbojet nozzle shell shape correcting tool

Abstract

A light speed adjustable laser interference system applied to a turbojet nozzle shell shape righting tool comprises a Michelson interference system and the shape righting tool, the shape righting tool comprises a bottom plate, a front plate, a rear plate and an upper plate, the front plate, the rear plate and the upper plate form a mounting frame, a first through hole is formed in the upper portion of the mounting frame, an upper pressing shape righting mechanism is assembled in the first through hole, and a second through hole is formed in the lower portion of the mounting frame. The bottom plate is provided with a Michelson interference system, the Michelson interference system comprises a light stroke difference and light velocity fine tuning system, the light stroke difference and light velocity fine tuning system comprises a glass tube, an oil container and a bidirectional pump, the side wall of the glass tube is provided with an oil supply port, the glass tube is vertically arranged on a light path between the beam splitter and the reflective mirror, and the oil supply port is communicated with the bidirectional pump. And a floating transparent sheet with the density smaller than that of the light-transmitting oil is arranged in the glass tube. The optical path difference is adjusted in the mode that the liquid level in the light path difference and light speed fine adjustment system rises and falls, the equal optical path is achieved between the reflection reflective mirror and the transmission reflective mirror, and the positioning, measuring and shape correcting precision is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of optical technology, and particularly to a laser interference system. Background Art

[0002] The nozzle of a jet engine is one of the key components of the engine, and its design and manufacturing precision directly affect the performance of the engine, such as thrust, fuel efficiency, noise, etc. The nozzle is usually made of superalloy and needs to withstand extreme temperatures and pressures. During the manufacturing process, geometric shape deviations may occur due to thermal deformation or mechanical stress. At this time, an orthopedic tooling is required to restore its design dimensions.

[0003] The nozzle has thin-wall and multi-curvature characteristics, such as a convergent-divergent profile. The orthopedic effect of complex geometric shapes is uneven, and it is difficult for traditional rigid tooling to apply force evenly. Local over-extrusion may cause buckling or wrinkling, while areas with insufficient support are under-corrected and require manual intervention for adjustment, resulting in poor consistency.

[0004] An interferometer is a precision measuring instrument designed based on the principle of wave superposition, mainly used to obtain information on the phase or optical path difference of waves through interference phenomena, thereby indirectly measuring physical quantities. Its core principle is to divide a beam of waves (such as light waves) into two or more beams, propagate through different paths, and then recombine them. The target parameters are deduced by analyzing the changes in interference fringes.

[0005] A laser interferometer can measure the angular swing and vibration frequency of a moving axis, and analyze the laser linewidth in combination with acousto-optic modulation technology. With its nanometer-level precision and wide applicability, the interferometer has become a core tool in scientific research and industrial inspection. From basic physics experiments to cosmic observations, and then to microelectronics manufacturing and biomedical engineering, its technology has continuously promoted the innovation in the field of precision measurement.

[0006] During the process of using an interferometer to assist in high-precision orthopedic treatment, the adjustment of the distances between the optical components of the interferometer is generally manually adjusted and fixed. For example, the position of the mirror, the position of the semi-transparent semi-reflecting mirror, the position of the laser, etc. The positional relationship of these optical components directly determines the detection performance of the device and even the correctness of the detection results. Manual adjustment has personal experience and other uncertain factors, which are prone to cause errors.

[0007] In addition, for the adjusted interferometer, during a single measurement, the positions of the optical components are fixed. Therefore, no matter whether the imaging effect is clear or not, it is difficult to perform manual intervention. Summary of the Invention

[0008] The purpose of the present invention is to provide a light-speed adjustable laser interference system applied to the orthopedic tooling of a turbojet nozzle housing to solve the problems existing in the above-mentioned prior art.

[0009] The above technical object of the present invention is achieved through the following technical solutions: A light speed adjustable laser interference system applied to an orthopedic tooling for a turbojet nozzle housing, including a Michelson interference system. The Michelson interference system includes a laser, a beam splitter, a reflecting mirror, a transmitting mirror, an industrial camera, and a microprocessor system. It includes an orthopedic tooling, and the orthopedic tooling includes a bottom plate, a front plate, a rear plate, and an upper plate; The front plate, rear plate, and upper plate form an installation frame; A first through hole is provided above the installation frame, and an upper pressing and orthopedic mechanism is assembled in the first through hole; An upper driving device is provided above the upper pressing and orthopedic mechanism; The upper pressing and orthopedic mechanism includes a tightening part and a pressing part; The tightening part is arranged above the upper plate, and the bottom of the tightening part is fixedly connected to the upper part of the pressing part through a locking bolt; The pressing part is arranged below the upper plate, and the lower part of the pressing part has an inclined surface; The Michelson interference system further includes a light path travel difference and light speed fine adjustment system; The reflecting mirror is fixed on the pressing part for monitoring the up and down movement distance of the pressing part; The transmitting mirror is fixed on the orthopedic tooling for cooperating with the laser, the beam splitter, and the reflecting mirror to form a first Michelson interference optical path; The microprocessor system reads the interference image of the first Michelson interference optical path through the industrial camera; The light path travel difference and light speed fine adjustment system includes a glass tube, an oil container, and a two-way pump; The side wall of the glass tube has an oil supply port, the oil supply port is connected to one pump port of the two-way pump, the other pump port of the two-way pump is connected to the oil container, and the oil container stores light-transmitting oil; Both ends of the glass tube are flat and transparent, and the glass tube is vertically arranged on the optical path between the beam splitter and the reflecting mirror; A floating transparent thin sheet with a density less than that of the light-transmitting oil is arranged in the glass tube, and the thin sheet is used to eliminate the unevenness of the light-transmitting oil liquid surface.

[0010] By adopting the above technical solution, the upper pressing and straightening mechanism of the orthopedic tooling can greatly improve the straightening accuracy with the aid of the Michelson interference system. The Michelson interference system includes a main optical system, an industrial camera, and a light path difference and light speed fine-tuning system. The main optical system is a conventional Michelson interferometer including a laser, a beam splitter, a reflecting mirror, a transmitting mirror, an industrial camera, and a microprocessor system. The settings of the reflecting mirror, the transmitting mirror, and the beam splitter in the main optical system, as well as the optical path, are the same as those in the prior art. However, when the industrial camera detects interference fringes with unequal and large light path differences, due to problems such as low contrast and blurred interference fringes, the actual monitoring accuracy cannot meet the requirements of straightening. Therefore, an equal optical path needs to be achieved between the reflecting mirror and the transmitting mirror; Since both the reflecting mirror and the transmitting mirror are arranged on the orthopedic tooling or the upper pressing and straightening mechanism through mounting rods, the adjustment can be carried out by adjusting the mounting rods. However, this adjustment method has poor accuracy and is very cumbersome; After introducing the light path difference and light speed fine-tuning system, the height of the light-transmitting oil in the glass tube can be adjusted by relying on a two-way pump. The height of the light-transmitting oil affects the time required for light to pass through it, and accordingly adjusts the light path difference. The refractive index of the light-transmitting oil has a smaller impact on the light path, which can further improve the adjustment accuracy. The glass tube is generally set vertically or horizontally and is always arranged on the optical path between the laser and the mirror, so as to achieve the adjustment of the light path difference. In this solution, the industrial camera uses a high-resolution MOS camera to monitor the change of interference fringes. The transparent sheet can effectively reduce the fluctuation of the liquid level in the glass tube. The equal optical path difference significantly increases the contrast of the interference fringes, making the recognition accuracy of the MOS camera higher and also greatly improving the positioning, measurement, and straightening accuracy.

[0011] In a further embodiment, the reflecting mirror is fixedly installed on the pressing part through a first mounting rod; One end of the first mounting rod where the reflecting mirror is arranged extends out of the mounting frame; The reflecting surface of the reflecting mirror is set horizontally; The transmitting mirror is fixedly installed on the right side of the rear plate through a second mounting rod; The reflecting surface of the transmitting mirror is set vertically.

[0012] By adopting the above technical solution, the reflecting mirror and the transmitting mirror form an orthogonal optical path layout. The extended design of the first mounting rod avoids the occlusion of the optical path by the frame structure. The combination of the horizontal and vertical reflecting surfaces ensures a stable interference optical path after the laser beam passes through the beam splitter, providing a reference plane for displacement measurement.

[0013] In a further embodiment, a second through hole is provided on the front plate, and the second through hole is used to accommodate the front end of the nozzle to be orthopedically treated; On the left and right sides of the second through hole, there are respectively arranged front pressing and straightening mechanisms. The front pressing and straightening mechanism includes a positioning plate and a movable plate. The positioning plate is an L-shaped plate fixed at the lower left front side of the front plate. The positioning plate does not exceed the left edge and the lower edge of the front plate, and the bent part of the positioning plate is located at the lower left corner of the front plate. The movable plate includes an extrusion part and a locking part. The extrusion part is arranged at the right end of the front side of the front plate. The bottom of the extrusion part is slidably installed on the upper inner side of the positioning plate, and a locking part is integrally formed on the right side of the extrusion part. The locking part is perpendicular to the extrusion part and is arranged towards the rear side direction of the front plate. Another locking bolt is arranged on the locking part. The movable plate is movably connected to the front plate through the another locking bolt, and the movable plate is used to cooperate with the positioning plate to extrude and straighten the front end of the nozzle to be straightened at the second through hole. A right driving device is arranged on the right side of the locking part.

[0014] By adopting the above technical solution, a front pressing and straightening mechanism is arranged between the front plate and the fixed plate, wherein the positioning plate is completely covered between the front plate and the fixed plate. The movable plate includes an extrusion part and a locking part, wherein the locking part is arranged outside the front plate and the fixed plate. When the movable plate is driven, the movable plate will approach the positioning plate, so as to straighten the fixed nozzle to be straightened. The upper pressing and straightening mechanism is installed above the upper plate. Due to the thin-wall part characteristic of the nozzle, applying pressure to one place may cause deformation in another place. Therefore, the front pressing mechanism and the upper pressing mechanism actually perform extrusion and straightening synchronously.

[0015] In a further embodiment, a fixed plate is arranged in front of the front pressing and straightening mechanism. First screw holes are arranged at the four corners of the front side of the fixed plate. The fixed plate is bolted to the front plate. An avoidance groove is arranged above the extrusion part. The avoidance groove is used to avoid the bolt at the upper right when the extrusion part moves from left to right. A plurality of second screw holes corresponding to the positions of the first screw holes are arranged at the upper left end, the lower left end and the lower right end of the front side of the positioning plate, and the positioning plate is bolted to the front plate.

[0016] By adopting the above technical solution, the fixed plate is rigidly fixed to the front plate through the four-corner bolts, and the three-point screw hole layout of the positioning plate ensures the installation stability while avoiding interference with the front plate bolts. The avoidance groove design of the extrusion part allows it to avoid the fixed bolts during the full-stroke movement, ensuring the continuity of the orthopedic action.

[0017] In a further embodiment, another Michelson interferometer system is further provided on the bottom plate; The another Michelson interferometer system includes another laser, another beam splitter, another reflecting mirror, another transmitting mirror, another industrial camera and another optical path difference and light speed fine-tuning system; The another reflecting mirror is arranged on the locking part for monitoring the left-right moving distance of the locking part; The another transmitting mirror is arranged at the upper front side of the fixed plate for cooperating with another laser, another beam splitter and another reflecting mirror to form a second Michelson interference optical path; The Michelson interferometer system and the another Michelson interferometer system share a microprocessor system; The microprocessor system reads the interference image of the second Michelson interference optical path through another industrial camera.

[0018] By adopting the above technical solution, the second set of Michelson interferometer system is the same as the first set, but the movable plate moves horizontally and cooperates with the positioning plate for extrusion orthopedics, while the upper pressing orthopedic mechanism moves from top to bottom. Therefore, the orientations of the beam splitters set in the two are different, and the lasers are both vertically upward. The two sets of Michelson interferometers share a microprocessor system, enabling the pressing mechanisms on both sides to cooperate more closely and avoiding unexpected deformation of the thin-walled parts during multiple extrusions in different directions.

[0019] In a further embodiment, the another reflecting mirror is fixedly installed on the locking part through a third mounting rod; The third mounting rod is an L-shaped rod, and the end of the third mounting rod where the another reflecting mirror is arranged extends from the back to the front out of the front side of the fixed plate; The reflecting surface of the another reflecting mirror is vertically arranged; The another transmitting mirror is fixedly installed on the front side of the fixed plate through a fourth mounting rod; The reflecting surface of the another transmitting mirror is horizontally arranged.

[0020] By adopting the above technical solution, the second set of interference system independently monitors the orthopedic displacement in the horizontal direction. Its L-shaped mounting rod ensures that the mirror moves synchronously with the locking part, and the arrangement of the vertical and horizontal reflecting surfaces forms a complete interference optical path.

[0021] In a further embodiment, the other optical path difference light speed fine-tuning system includes another glass tube, another oil container, and another two-way pump; The other glass tube is vertically arranged on the optical path between another beam splitter and another transmissive mirror.

[0022] By adopting the above technical solution, the glass tube in another set of optical path difference light speed fine-tuning system is also vertically arranged. For the adjustment of the optical path difference, whether adjusting the transmissive mirror or the reflective mirror is the same. As long as the final optical path difference is ensured to be equal, the contrast of the image will be higher, and it is also more convenient for the MOS camera to identify, thereby improving the orthopedic accuracy.

[0023] In a further embodiment, the transparent oil can be any one of silicone oil, white oil, synthetic ester oil, fluorinated oil, vegetable oil, or methyl silicone oil.

[0024] By adopting the above technical solution, several listed transparent oils all have high light transmittance, stability of refractive index, low volatility, and moderate viscosity. They can not only accurately control the liquid level through a peristaltic pump but also reduce the liquid surface disturbance. Among them, methyl silicone oil has excellent temperature stability and chemical inertness and is suitable for long-term use. Synthetic ester oil has better refractive index matching characteristics and can quickly stabilize the liquid surface through the fine adjustment of the peristaltic pump combined with the damping effect of the floating sheet, ensuring the repeatability of the optical path difference adjustment and avoiding the errors existing in the traditional mechanical stage for adjusting the optical path. It is especially suitable for rapid calibration in high-precision industrial scenarios; The light speed travel difference fine-tuning system using methyl silicone oil has the characteristics of good colorless transparent light transmittance, temperature resistance (-50°C to 200°C), weak volatility inside the device, stable chemical properties for an extremely long time, moderate liquid viscosity, high adjustment sensitivity and accuracy, etc.

[0025] The speed of light in air is generally taken as 3×10 8 m / s.

[0026] The refractive index range of methyl silicone oil at 25°C is usually: 1.390 - 1.410, and the specific value varies slightly with viscosity and temperature. For example: low-viscosity silicone oil: refractive index 1.375; medium-high-viscosity silicone oil: refractive index 1.403. Taking the typical refractive index 1.395 as an example, the light speed is calculated as: 2.15×10 8 m / s.

[0027] In the present invention, by adjusting the liquid level height in the glass tube, the travel distance of light in the transparent liquid is adjusted. Furthermore, a high-precision optical path (optical path difference) adjustment is formed.

[0028] Taking methyl silicone oil as an example, the difference in the speed of light between the two is 0.85×10 8m / s, which is 28% of the speed of light in air. When the liquid level in the glass tube is adjusted to 1mm, it is equivalent to adjusting the position of the optical device by only 0.28mm.

[0029] It is possible to adjust a larger liquid level, which is equivalent to adjusting a smaller liquid level in a glass tube. Therefore, the adjustment accuracy is greatly improved.

[0030] In a further embodiment, the remaining space above the liquid level of the glass tube and the other glass tube and outside the liquid in the transparent liquid holding container is a vacuum space.

[0031] In a further embodiment, the bidirectional pump and the other bidirectional pump are both peristaltic pumps, and the flexible tubes of the peristaltic pumps are both arranged in a vacuum container.

[0032] By adopting the above technical solution, the glass tube and the oil container are evacuated, which ensures smooth flow, stability and linearity of the flow, and the accuracy of equipment operation. The flexible pump tube of the peristaltic pump is encapsulated in a vacuum box, which realizes the combination of the peristaltic pump and the vacuumed glass tube and oil container, improves the efficiency of optical path difference adjustment, and avoids liquid level oscillation caused by pressure fluctuations.

[0033] In summary, the present invention has the following beneficial effects: 1. Through the setting of the Michelson interference system and the light stroke difference light speed fine-tuning system, the nozzle correction control with nanometer-level precision can be achieved. The traditional correction tooling relies on manual experience to judge the deformation amount, while the dual interference system of the present invention can monitor the displacement changes in the up and down and horizontal directions in real time, and cooperate with the microprocessor system to achieve closed-loop control. The light stroke difference adjustment system uses liquid medium to adjust the optical path, which has higher resolution and stability than the mechanical adjustment method. In particular, the design of the floating sheet effectively suppresses the fluctuation of the liquid level and improves the contrast of the interference fringes, which makes the Michelson interference system optical path adjustment more efficient, and significantly improves the recognition accuracy of the industrial camera and the correction accuracy. 2. Through the setting of the upper clamping orthopedic mechanism and the front clamping orthopedic mechanism, they can be driven independently but work together. The force size and direction can be adjusted in real time according to the moving distance feedback from the interference system. The structural design of the L-shaped mounting rod and the avoidance groove not only ensures the accurate positioning of the optical components, but also ensures the freedom of movement of the mechanical parts. The three-point bolt fixing method enables the positioning plate to remain stable when subjected to a large orthopedic force, thereby avoiding the secondary deformation problem caused by insufficient rigidity of traditional tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1It is a schematic diagram of the overall structure in the light speed adjustable laser interference system applied to the orthopedic tooling of the turbojet nozzle housing, used to reflect the positional relationship between the Michelson interferometer system and the light path difference light speed fine-tuning system on the orthopedic tooling; Figure 2 It is a partial schematic diagram of the Michelson interference system in the light speed adjustable laser interference system applied to the orthopedic tooling of the turbojet nozzle housing, used to reflect the Michelson interference system; Figure 3 It is a schematic diagram of the orthopedic tooling in the light speed adjustable laser interference system applied to the orthopedic tooling of the turbojet nozzle housing, used to reflect the orthopedic tooling; Figure 4 It is a schematic diagram of the upper pressing orthopedic mechanism in the light speed adjustable laser interference system applied to the orthopedic tooling of the turbojet nozzle housing, used to reflect the upper pressing orthopedic mechanism; Figure 5 It is a schematic diagram of the front pressing orthopedic mechanism in the light speed adjustable laser interference system applied to the orthopedic tooling of the turbojet nozzle housing, used to reflect the front pressing orthopedic mechanism; Figure 6 It is a schematic diagram of the light path difference light speed fine-tuning system in the light speed adjustable laser interference system applied to the orthopedic tooling of the turbojet nozzle housing, used to reflect the light path difference light speed fine-tuning system.

[0035] In the figure, 1 is the orthopedic tooling; 11 is the bottom plate; 12 is the front plate; 13 is the rear plate; 14 is the upper plate; 2 is the upper pressing orthopedic mechanism; 21 is the tightening part; 22 is the pressing part; 3 is the upper driving device; 4 is the Michelson interference system; 41 is the laser; 42 is the beam splitter; 43 is the reflecting mirror; 44 is the transmitting mirror; 45 is the industrial camera; 46 is the microprocessor system; 47 is the light path difference light speed fine-tuning system; 471 is the glass tube; 472 is the oil container; 473 is the two-way pump; 5 is the thin sheet; 6 is the front pressing orthopedic mechanism; 61 is the positioning plate; 62 is the movable plate; 621 is the extrusion part; 622 is the locking part; 7 is the fixing plate; 8 is the right driving device; 9 is another reflecting mirror; 10 is another transmitting mirror. Detailed implementation mode

[0036] The following further elaborates on the present invention in conjunction with the attached drawings.

[0037] Among them, the same components are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the attached Figure 1In the directions mentioned, the terms "bottom surface" and "top surface", "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component. Additionally, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this specification, "a plurality" means two or more, unless otherwise specifically defined.

[0038] As Figures 1-6 shown, the light speed adjustable laser interference system applied to the orthopedic tooling for a turbojet nozzle housing includes a Michelson interference system 4. The Michelson interference system includes a laser 41, a beam splitter 42, a reflecting mirror 43, a transmitting mirror 44, an industrial camera 45, and a microprocessor system 46. It includes an orthopedic tooling 1, and the orthopedic tooling 1 includes a bottom plate 11, a front plate 12, a rear plate 13, and an upper plate 14. The front plate 12, the rear plate 13, and the upper plate 14 form an installation frame. A first through hole is provided above the installation frame, and an upper pressing and orthopedic mechanism 2 is assembled in the first through hole. An upper driving device 3 is provided above the upper pressing and orthopedic mechanism 2. The upper pressing and orthopedic mechanism 2 includes a tightening part 21 and a pressing part 22. The tightening part 21 is arranged above the upper plate 14, and the bottom of the tightening part 21 is fixedly connected to the upper part of the pressing part 22 through a locking bolt. The pressing part 22 is arranged below the upper plate 14, and the lower part of the pressing part 22 has an inclined surface. The Michelson interference system 4 further includes a light path difference and light speed fine-tuning system 47. The reflecting mirror 43 is fixed on the pressing part 22 and is used to monitor the up and down movement distance of the pressing part 22. The transmitting mirror 44 is fixed on the orthopedic tooling 1 and is used to cooperate with the laser 41, the beam splitter 42, and the reflecting mirror 43 to form a first Michelson interference optical path. The microprocessor system 46 reads the interference image of the first Michelson interference optical path through the industrial camera 45. The light path difference and light speed fine-tuning system 47 includes a glass tube 471, an oil container 472, and a two-way pump 473. The side wall of the glass tube 471 has an oil supply port, and the oil supply port is connected to one pump port of the two-way pump 473. The other pump port of the two-way pump 473 is connected to the oil container 472, and the oil container 472 stores a light-transmitting oil. The two ends of the glass tube 471 are flat and transparent. The glass tube 471 is vertically arranged on the optical path between the beam splitter 42 and the reflecting mirror 43. A floating transparent thin sheet 5 with a density less than that of the light-transmitting oil is arranged in the glass tube 471, and the thin sheet 5 is used to eliminate the unevenness of the light-transmitting oil liquid surface.

[0039] By adopting the above technical solution, the upper pressing and orthopedic mechanism 2 of the orthopedic tooling 1 can greatly improve the orthopedic accuracy with the aid of the Michelson interference system 4. The Michelson interference system 4 includes a main optical system, an industrial camera 45, and a light path difference and light speed fine-tuning system 47. The main optical system is a conventional Michelson interferometer including a laser 41, a beam splitter 42, a reflecting mirror 43, a transmitting mirror 44, an industrial camera 45, and a microprocessor system 46. The settings of the reflecting mirror 43, the transmitting mirror 44, and the beam splitter 42 in the main optical system, as well as the optical path, are the same as those in the prior art. However, when the industrial camera 45 detects interference fringes with unequal and large deviations in the optical path difference, due to problems such as low contrast and blurred interference fringes, the actual monitoring accuracy cannot meet the requirements of orthopedics. Therefore, it is necessary to achieve equal optical path between the reflecting mirror 43 and the transmitting mirror 44; Since both the reflecting mirror 43 and the transmitting mirror 44 are arranged on the orthopedic tooling 1 or the upper pressing and orthopedic mechanism 2 through mounting rods, the adjustment can be made by adjusting the mounting rods. However, this adjustment method has poor accuracy and is very cumbersome; After introducing the light path difference and light speed fine-tuning system 47, the height of the light-transmitting oil in the glass tube 471 can be adjusted by relying on the two-way pump 473. The height of the light-transmitting oil affects the time required for light to pass through it, and accordingly adjusts the optical path difference. The refractive index of the light-transmitting oil has a smaller impact on the optical path, thus further improving the adjustment accuracy. The glass tube 471 is generally arranged vertically or horizontally and is always arranged on the optical path between the laser 41 and the reflecting mirror, so as to be able to adjust the optical path difference. In this solution, the industrial camera 45 uses a high-resolution MOS camera to monitor the change of interference fringes. The transparent sheet 5 can effectively reduce the fluctuation of the liquid level in the glass tube 471. The equal optical path difference significantly increases the contrast of the interference fringes, making the recognition accuracy of the MOS camera higher and greatly improving the positioning, measurement, and orthopedic accuracy.

[0040] In a further embodiment, the reflecting mirror 43 is fixedly installed on the pressing part 22 through a first mounting rod. One end of the first mounting rod where the reflecting mirror 43 is arranged extends out of the mounting frame. The reflecting surface of the reflecting mirror 43 is arranged horizontally. The transmitting mirror 44 is fixedly installed on the right side of the rear plate 13 through a second mounting rod. The reflecting surface of the transmitting mirror 44 is arranged vertically.

[0041] By adopting the above technical solution, the reflecting mirror 43 and the transmitting mirror 44 form an orthogonal optical path layout. The extended design of the first mounting rod avoids the occlusion of the optical path by the frame structure. The combination of the horizontal and vertical reflecting surfaces ensures that the laser beam forms a stable interference optical path after passing through the beam splitter 42, providing a reference plane for displacement measurement.

[0042] In a further embodiment, a second through-hole is provided on the front plate 12. The second through-hole is used to accommodate the front end of the nozzle to be orthopedically corrected. On the left and right sides of the second through-hole, front pressing and orthopedic mechanisms 6 are respectively provided. The front pressing and orthopedic mechanism 6 includes a positioning plate 61 and a movable plate 62. The positioning plate 61 is an L-shaped plate fixedly arranged at the lower left front side of the front plate 12. The positioning plate 61 does not exceed the left and lower edges of the front plate 12. The bent part of the positioning plate 61 is located at the lower left corner of the front plate 12. The movable plate 62 includes an extrusion part 621 and a locking part 622. The extrusion part 621 is arranged at the right front side of the front plate 12. The bottom of the extrusion part 621 is slidably installed on the inner upper side of the positioning plate 61. A locking part 622 is integrally formed on the right side of the extrusion part 621. The locking part 622 is perpendicular to the extrusion part 621 and is arranged in the direction of the rear side of the front plate 12. Another locking bolt is provided on the locking part 622. The movable plate 62 is movably connected to the front plate 12 through another locking bolt. The movable plate 62 is used to cooperate with the positioning plate 61 to extrude and orthopedically correct the front end of the nozzle to be orthopedically corrected at the second through-hole. A right driving device 8 is provided on the right side of the locking part 622.

[0043] By adopting the above technical solution, a front pressing and orthopedic mechanism 6 is provided between the front plate 12 and the fixed plate 7, wherein the positioning plate 61 is completely covered between the front plate 12 and the fixed plate 7; The movable plate 62 includes an extrusion part 621 and a locking part 622, wherein the locking part 622 is arranged outside the front plate 12 and the fixed plate 7. When the movable plate 62 is driven, the movable plate 62 will move closer to the positioning plate 61, so as to orthopedically correct the fixed nozzle to be orthopedically corrected. The upper pressing and orthopedic mechanism 2 is installed above the upper plate 14; Due to the thin-walled part characteristics of the nozzle, applying pressure to one place may cause deformation in another place. Therefore, the front pressing mechanism and the upper pressing mechanism actually perform extrusion and orthopedic correction synchronously.

[0044] In a further embodiment, a fixed plate 7 is provided in front of the front pressing and orthopedic mechanism 6. First screw holes are provided at the four corners of the front side of the fixed plate 7. The fixed plate 7 is bolted to the front plate 12. An avoidance groove is provided above the extrusion part 621. The avoidance groove is used to avoid the bolt at the upper right when the extrusion part 621 moves from left to right. A plurality of second screw holes corresponding to the positions of the first screw holes are provided at the upper left end, the lower left end and the lower right end of the front side of the positioning plate 61. The positioning plate 61 is bolted to the front plate 12.

[0045] By adopting the above technical solution, the fixed plate 7 is rigidly fixed to the front plate 12 through bolt connections at the four corners. The three-point screw hole layout of the positioning plate 61 avoids bolt interference with the front plate 12 while ensuring installation stability. The design of the avoidance groove of the extrusion part 621 allows it to avoid the fixed bolt during the full stroke movement, ensuring the continuity of the orthopedic action.

[0046] In a further embodiment, another Michelson interferometer system is also provided on the bottom plate 11. The another Michelson interferometer system includes another laser, another beam splitter, another reflecting mirror 9, another transmitting mirror 10, another industrial camera and another optical path difference and light speed fine-tuning system. The another reflecting mirror 9 is arranged on the locking part 622 and is used for monitoring the left and right moving distance of the locking part 622. The another transmitting mirror 10 is arranged at the upper front side of the fixing plate 7 and is used for cooperating with the another laser, the another beam splitter and the another reflecting mirror 9 to form a second Michelson interference optical path. The Michelson interferometer system 4 and the another Michelson interferometer system share the microprocessor system 46, and the microprocessor system 46 reads the interference image of the second Michelson interference optical path through the another industrial camera.

[0047] By adopting the above technical solution, the second set of Michelson interferometer system 4 is the same as the first set, but the movable plate 62 moves horizontally and cooperates with the positioning plate 61 for extrusion straightening, while the upper pressing and straightening mechanism 2 moves from top to bottom. Therefore, the orientations of the beam splitters 42 arranged in the two are different, and the lasers 41 are both arranged vertically upward. The two sets of Michelson interferometers share a microprocessor system 46, enabling the pressing mechanisms on both sides to cooperate more closely and avoiding unexpected deformation of the thin-walled part during multiple extrusions in different directions.

[0048] In a further embodiment, the another reflecting mirror 9 is fixedly installed on the locking part 622 through a third mounting rod. The third mounting rod is an L-shaped rod. The end of the third mounting rod where the another reflecting mirror 9 is arranged extends from the back to the front out of the front side of the fixing plate 7. The reflecting surface of the another reflecting mirror 9 is vertically arranged. The another transmitting mirror 10 is fixedly installed on the front side of the fixing plate 7 through a fourth mounting rod. The reflecting surface of the another transmitting mirror 10 is horizontally arranged.

[0049] By adopting the above technical solution, the second set of interference system independently monitors the straightening displacement in the horizontal direction. Its L-shaped mounting rod ensures that the reflecting mirror moves synchronously with the locking part 622, and the arrangement of the vertical and horizontal reflecting surfaces forms a complete interference optical path.

[0050] In a further embodiment, the another optical path difference and light speed fine-tuning system includes another glass tube, another oil container and another two-way pump. The another glass tube is vertically arranged on the optical path between the another beam splitter and the another transmitting mirror 10.

[0051] By adopting the above technical solution, the glass tube 471 in another set of light path difference and light speed fine-tuning system 47 is also vertically arranged. For the adjustment of the optical path difference, it doesn't matter whether it is the transmission mirror or the reflection mirror 43 that is adjusted. As long as the final optical path difference is equal, the contrast of the image will be higher, and it will be more convenient for the MOS camera to identify, thus improving the orthopedic accuracy.

[0052] In a further embodiment, the light-transmitting oil can be any one of silicone oil, white oil, synthetic ester oil, fluorinated oil, vegetable oil or methyl silicone oil.

[0053] By adopting the above technical solution, several listed light-transmitting oils have high light transmittance, stability of refractive index, low volatility and moderate viscosity. They can not only accurately control the liquid level through a peristaltic pump, but also reduce the liquid surface disturbance. Among them, methyl silicone oil has excellent temperature stability and chemical inertness, which is suitable for long-term use. Synthetic ester oil has better refractive index matching characteristics, and can quickly stabilize the liquid surface through the fine adjustment of the peristaltic pump combined with the damping effect of the floating sheet 5, ensuring the repeatability of the optical path difference adjustment, and avoiding the errors existing in the traditional mechanical stage for adjusting the optical path. It is especially suitable for rapid calibration in high-precision industrial scenarios. The light speed travel difference fine-tuning system using methyl silicone oil has the characteristics of good colorless and transparent light transmittance, heat resistance (-50°C to 200°C), weak volatility inside the device, stable chemical properties within an extremely long time, moderate liquid viscosity, high adjustment sensitivity and accuracy.

[0054] The speed of light in air is generally taken as 3×10 8 m / s.

[0055] The refractive index range of methyl silicone oil at 25°C is usually: 1.390 - 1.410, and the specific value varies slightly with viscosity and temperature. For example: low-viscosity silicone oil: refractive index 1.375; medium-high viscosity silicone oil: refractive index 1.403. Taking the typical refractive index 1.395 as an example, the light speed is calculated as: 2.15×10 8 m / s.

[0056] In the present invention, by adjusting the liquid level height in the glass tube, the travel distance of light in the transparent liquid is adjusted. Furthermore, a high-precision optical path (optical path difference) adjustment is formed.

[0057] Taking methyl silicone oil as an example, the difference in the speed of light between the two is 0.85×10 8 m / s, accounting for 28% of the speed of light in air. When the liquid level height in the glass tube is adjusted by 1 mm, it is only equivalent to adjusting the position of the optical device by 0.28 mm.

[0058] It is possible to achieve the effect of adjusting a large liquid level height, which is equivalent to adjusting a smaller liquid level height in the glass tube. Therefore, the adjustment accuracy is greatly improved.

[0059] In a further embodiment, above the liquid levels of the glass tube 471 and another glass tube, in the transparent liquid storage container, the remaining space outside the liquid is a vacuum space.

[0060] In a further embodiment, both the two-way pump 473 and another two-way pump are peristaltic pumps, and the flexible tubes of the peristaltic pumps are all arranged in a vacuum container.

[0061] By adopting the above technical solutions, the glass tube 471 and the oil container 472 are both evacuated. One is to ensure smooth flow, and the other is to ensure stable and linear flow, ensuring the operation accuracy of the equipment. The flexible pump tube of the peristaltic pump is encapsulated in a vacuum box body, realizing the combined use of the peristaltic pump and the evacuated glass tube 471 and oil container 472. While improving the optical path difference adjustment efficiency, it avoids the liquid level oscillation caused by pressure fluctuations.

[0062] In the embodiments disclosed in the present invention, terms such as "installation", "connection", "linkage", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linkage" can be a direct linkage or an indirect linkage through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments disclosed in the present invention can be understood according to specific circumstances.

[0063] This specific embodiment is only an interpretation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A light speed adjustable laser interference system applied to an orthopedic tooling for a turbojet nozzle housing, comprising a Michelson interference system (4), the Michelson interference system including a laser (41), a beam splitter (42), a reflecting mirror (43), a transmitting mirror (44), an industrial camera (45), and a microprocessor system (46), characterized in that: It includes an orthopedic tooling (1), and the orthopedic tooling (1) includes a bottom plate (11), a front plate (12), a rear plate (13) and a top plate (14); The front plate (12), the rear plate (13) and the top plate (14) form an installation frame; Above the installation frame, there is a first through hole, and an upper pressing and orthopedic mechanism (2) is assembled in the first through hole; Above the upper pressing and orthopedic mechanism (2), there is an upper driving device (3); The upper pressing and orthopedic mechanism (2) includes a tightening part (21) and a pressing part (22); The tightening part (21) is arranged above the top plate (14), and the bottom of the tightening part (21) is fixedly connected to the upper part of the pressing part (22) through a locking bolt; The pressing part (22) is arranged below the top plate (14), and there is an inclined surface below the pressing part (22); The Michelson interference system (4) further includes a light path difference and light speed fine-tuning system (47); The reflecting mirror (43) is fixed on the pressing part (22) and is used to monitor the up and down movement distance of the pressing part (22); The transmitting mirror (44) is fixed on the orthopedic tooling (1) and is used to cooperate with the laser (41), the beam splitter (42) and the reflecting mirror (43) to form a first Michelson interference optical path; The microprocessor system (46) reads the interference image of the first Michelson interference optical path through the industrial camera (45); The light path difference and light speed fine-tuning system (47) includes a glass tube (471), an oil container (472) and a two-way pump (473); On the side wall of the glass tube (471), there is an oil supply port, the oil supply port is connected to one pump port of the two-way pump (473), the other pump port of the two-way pump (473) is connected to the oil container (472), and the oil container (472) stores light-transmitting oil; Both ends of the glass tube (471) are flat and transparent, and the glass tube (471) is vertically arranged on the optical path between the beam splitter (42) and the reflecting mirror (43); Inside the glass tube (471), there is a floating transparent thin sheet (5) with a density less than that of the light-transmitting oil, and the thin sheet (5) is used to eliminate the unevenness of the light-transmitting oil liquid surface; 2. The light speed adjustable laser interference system applied to the orthopedic tooling for the turbojet nozzle housing according to claim 1, characterized in that: The reflecting mirror (43) is fixedly installed on the pressing part (22) through a first mounting rod; One end of the first mounting rod where the reflecting mirror (43) is arranged extends out of the installation frame; The reflecting surface of the reflecting mirror (43) is horizontally arranged; The transmitting mirror (44) is fixedly installed on the right side of the rear plate (13) through a second mounting rod; The reflecting surface of the transmitting mirror (44) is vertically arranged; 3. The light speed adjustable laser interference system applied to the orthopedic tooling for the turbojet nozzle housing according to claim 1, wherein: On the front plate (12), there is a second through hole, and the second through hole is used to accommodate the front end of the nozzle to be orthopedically treated; On the left and right sides of the second through hole, there are front pressing and orthopedic mechanisms (6) respectively; The front pressing and orthopedic mechanism (6) includes a positioning plate (61) and a movable plate (62); The positioning plate (61) is an L-shaped plate fixedly arranged at the lower left front side of the front plate (12), the positioning plate (61) does not exceed the left and lower edges of the front plate (12), and the bending part of the positioning plate (61) is located at the lower left corner of the front plate (12); The movable plate (62) includes an extrusion part (621) and a locking part (622); The extrusion part (621) is arranged at the right end of the front side of the front plate (12). The bottom of the extrusion part (621) is slidably installed on the inner upper side of the positioning plate (61). A locking part (622) is integrally formed on the right side of the extrusion part (621); The locking part (622) is perpendicular to the extrusion part (621), and the locking part (622) is arranged in the direction of the rear side of the front plate (12); Another locking bolt is arranged on the locking part (622). The movable plate (62) is movably connected to the front plate (12) through another locking bolt. The movable plate (62) is used to cooperate with the positioning plate (61) to extrude and orthotropically correct the front end of the nozzle to be orthotropically corrected at the second through hole; A right driving device (8) is arranged on the right side of the locking part (622).

4. The light speed adjustable laser interference system applied to the orthopedic tooling for the turbojet nozzle housing according to claim 3, characterized in that: A fixing plate (7) is arranged in front of the front pressing and orthotropically correcting mechanism (6); First screw holes are arranged at the four corners of the front side of the fixing plate (7); The fixing plate (7) is bolted to the front plate (12); An avoidance groove is arranged above the extrusion part (621); The avoidance groove is used to avoid the bolt in the upper right when the extrusion part (621) moves from left to right; A plurality of second screw holes corresponding to the positions of the first screw holes are arranged at the upper left end, the lower left end and the lower right end of the front side of the positioning plate (61). The positioning plate (61) is bolted to the front plate (12).

5. The light speed adjustable laser interference system applied to the orthopedic tooling for the turbojet nozzle housing according to claim 4, characterized in that: Another Michelson interferometer system is also arranged on the bottom plate (11); The another Michelson interferometer system includes another laser, another beam splitter, another reflecting mirror (9), another transmitting mirror (10), another industrial camera and another optical path difference and light speed fine tuning system; The another reflecting mirror (9) is arranged on the locking part (622) and is used to monitor the left - right moving distance of the locking part (622); The another transmitting mirror (10) is arranged at the upper front end of the front side of the fixing plate (7) and is used to cooperate with another laser, another beam splitter and another reflecting mirror (9) to form a second Michelson interference optical path; The Michelson interferometer system (4) and another Michelson interferometer system share a microprocessor system (46); The microprocessor system (46) reads the interference image of the second Michelson interference optical path through another industrial camera.

6. The light speed adjustable laser interference system applied to the orthopedic tooling for the turbojet nozzle housing according to claim 5, characterized in that: The another reflecting mirror (9) is fixedly installed on the locking part (622) through a third mounting rod; The third mounting rod is an L - shaped rod. The end of the third mounting rod where the another reflecting mirror (9) is arranged extends from the rear to the front out of the front side of the fixing plate (7); The reflecting surface of the another reflecting mirror (9) is vertically arranged; The another transmitting mirror (10) is fixedly installed on the front side of the fixing plate (7) through a fourth mounting rod; The reflecting surface of the another transmitting mirror (10) is horizontally arranged.

7. The light speed adjustable laser interference system applied to the orthopedic tooling for the turbojet nozzle housing according to claim 6, characterized in that: The another optical path difference and light speed fine tuning system includes another glass tube, another oil container and another two - way pump; The another glass tube is vertically arranged on the optical path between another beam splitter and another transmitting mirror (10).

8. The light speed adjustable laser interference system applied to the orthopedic tooling for the turbofan nozzle housing according to claim 1, characterized in that: The light-transmitting oil can be any one of silicone oil, white oil, synthetic ester oil, fluorinated oil, vegetable oil or methyl silicone oil.

9. The light speed adjustable laser interference system applied to the orthopedic tooling for the turbojet nozzle housing according to any one of claims 1 to 7, characterized in that: Above the liquid levels of the glass tube (471) and another glass tube, in the transparent liquid storage container, the remaining space outside the liquid is a vacuum space.

10. The light speed adjustable laser interference system applied to the orthopedic tooling for the turbojet nozzle housing according to any one of claims 1 to 7, characterized in that: The two-way pump (473) and another two-way pump both adopt peristaltic pumps, and the flexible tubes of the peristaltic pumps are all arranged in a vacuum container.

Images