Aero blade orthopedic torque wrench system

Abstract

The application relates to an aviation blade straightening torque wrench system and relates to the field of aviation blade straightening, which comprises a hydraulic torque wrench system, the hydraulic torque wrench system comprises a wrench head, the wrench head is provided with a diffuse reflection plane; further comprising a laser interferometer, the laser interferometer comprises a laser, a beam splitter and an interference detection system, the beam splitter divides an incident light beam into a measuring light beam and a reference light beam and projects the measuring light beam and the reference light beam to the diffuse reflection plane; further comprising an optical collimation system, the optical collimation system comprises two hollow straight pipes, optical component systems are arranged behind the two hollow straight pipes; the interference detection system is connected with a hydraulic control system; a light speed adjusting pipe is arranged on a light path of the measuring light beam, the light speed adjusting pipe comprises a stainless steel pipe; further comprising an air compressor, the air compressor is connected with the inside of the light speed adjusting pipe, an air inlet of the air compressor is connected with a gas container; further provided with a refrigeration system, a refrigeration pipe is wrapped outside the stainless steel pipe, and a temperature sensor is attached to the inner wall of the stainless steel pipe. The application has the effect of realizing high-precision torsional straightening of aviation blades.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero blade straightening, and in particular to an aero blade straightening torque wrench system. BACKGROUND

[0002] The aero blade of an aero engine is a rotating part in a turbine, and its precise structure and aerodynamic performance directly determine the thrust and efficiency of the engine. The aero blade works in an extreme environment of high temperature, high pressure and high speed, and a slight deviation in its geometric profile, twist angle and other parameters can cause the efficiency of the aero engine to decrease, the vibration to intensify, and even serious safety accidents to occur. Therefore, the requirements for the aero blade are extremely harsh during the manufacturing and maintenance of the aero blade, reaching the micron level.

[0003] At present, the straightening of the aero blade relies on a traditional twist straightening system. The traditional twist straightening system usually drives through a hydraulic or electric drive, and transmits power to a wrench head via bearings, pistons, gears and other mechanical structures, so as to apply a torque to the aero blade. However, the bearings, pistons, gears and other mechanical structures of the traditional twist straightening system inevitably have gaps. After the gaps of these mechanical structures are stacked step by step, a large error is generated. In precise manufacturing, how to eliminate the error caused by these mechanical structures is a core technology and a core difficulty in the industrial mother machine manufacturing system.

[0004] In the aero precise manufacturing technology, the step-by-step stacking of the mechanical structure gap error has a much greater influence on the product quality and aviation safety than the traditional mechanical manufacturing. Therefore, in the aero precise manufacturing technology, the precision needs to be much higher than the traditional precision in the traditional industrial mother machine manufacturing system. However, the gaps of the mechanical structures at all levels are inevitable, and the error stacking is inevitable. The traditional manufacturing process equipment can only improve the manufacturing process, and it is difficult to meet the precision requirements of the aero precise manufacturing. Therefore, for the straightening of the aero blade, a solution is needed, which can bypass the mechanical error chain and directly monitor and control the execution end with high precision. SUMMARY

[0005] In view of the deficiencies in the prior art, one of the purposes of the present application is to provide an aero blade straightening torque wrench system.

[0006] The aero blade straightening torque wrench system provided by the present application adopts the following technical solution:

[0007] The aero blade straightening torque wrench system comprises a hydraulic torque wrench system, the hydraulic torque wrench system comprises a wrench head and a support for fixing the aero blade, and the hydraulic control system of the hydraulic torque wrench system has a signal input end, and the wrench head is provided with a diffuse reflection plane on one side;

[0008] The laser interferometer further comprises a laser, a beam splitter and an interference detection system;

[0009] The laser interferometer comprises a laser, a beam splitter and an interference detection system, and the beam splitter divides the incident light beam into a measurement light beam and a reference light beam;

[0010] The measurement light beam and the reference light beam are projected to the left and right ends of the diffuse reflection plane of the wrench head;

[0011] The optical collimation system comprises two hollow straight tubes, and the two hollow straight tubes are parallel to the pointing directions of the measurement light beam and the reference light beam, respectively;

[0012] The two optical component systems are arranged behind the two hollow straight tubes and are used for adjusting the angles of the light rays;

[0013] The two optical component systems respectively adjust the return light beams transmitted by the two hollow straight tubes and introduce the return light beams into the interference detection system for interference;

[0014] The detection signal output end of the interference detection system is connected to the signal input end of the hydraulic control system, so that the interference detection system realizes feedback control on the hydraulic torque wrench system;

[0015] The optical speed adjustment tube is arranged on the measurement light beam and comprises a stainless steel tube, and the two ends of the stainless steel tube are sealed by tempered glass plates;

[0016] The air compressor is further arranged, the air outlet of the air compressor is communicated with the inside of the optical speed adjustment tube, and the air inlet of the air compressor is connected to a gas container;

[0017] The refrigeration system is further arranged, the refrigeration pipe of the refrigeration system is arranged outside the stainless steel tube, and the temperature sensor is attached to the inner wall of the stainless steel tube;

[0018] The temperature sensor is connected to the temperature signal input end of the microprocessor of the refrigeration system, so that feedback control on the temperature is realized.

[0019] In the aviation precision manufacturing technology, the step-by-step superposition of mechanical structure gap errors has a greater influence on product quality and aviation safety than traditional mechanical manufacturing.

[0020] The present application provides a solution that can bypass the mechanical error chain and directly monitor and control the execution end with high precision for the orthopedic of the aviation blade.

[0021] In the process of twisting and straightening the aviation blade with the wrench head, the whole wrench head will move, the measurement reference of the traditional laser interferometer is established on the internal fixed reference light path, only the absolute displacement between the laser interferometer and the measurement target can be realized, and the relative change between the components of the target object itself cannot be directly measured. When the wrench head moves or vibrates as a whole during the force process, the irrelevant displacement of this part will be measured as an error, so that the key parameter of the twist angle of the wrench head cannot be effectively and directly captured by the traditional laser interferometer.

[0022] In the patent application, the relative displacement between the left and right ends of the wrench head is detected, so that the twist parameter information of the whole wrench head is obtained. The technical problem that the traditional laser interferometer cannot effectively detect the relative movement of the component itself in the case of overall displacement is overcome, and the dynamic, overall, anti-interference and accurate detection effect is obtained, and the effect of accurate straightening of the overall angle of the aviation blade is realized.

[0023] By adopting the above technical scheme, the independent reference mirror necessary for the traditional interferometer is abandoned, the measurement light beam and the reference light beam are synchronously projected to the diffuse reflection plane of the wrench head, so that when the wrench head inevitably shakes slightly during rotation, the measurement light beam and the reference light beam can change synchronously, thereby avoiding the error introduced in the interference detection, greatly improving the perception accuracy of the wrench head, and improving the precision of the aviation blade straightening.

[0024] In addition, the application introduces a specially designed optical collimation system, which performs secondary screening on the light reflected by the wrench head, so that the light that has lost phase correlation due to diffuse reflection has coherence again after collimation screening. This design successfully bypasses the inherent error chain of the traditional twist straightening system, and realizes high-precision direct measurement of the actual twist state of the wrench head.

[0025] To address measurement errors introduced by environmental factors in laser measurements, this invention introduces a specific gas into a sealed light velocity adjustment tube using an air compressor. By changing the gas pressure, the gas density is initially adjusted, laying the foundation for precise control of the refractive index. Building upon this, the invention introduces a refrigeration system based on temperature sensor feedback control. On one hand, the refrigeration system eliminates refractive index fluctuations caused by the temperature rise and subsequent cooling resulting from gas compression by the air compressor. On the other hand, it achieves precise control of the gas refractive index through cooling. Based on the ideal gas law PV=nRT, in a closed pipeline, the volume V and the amount of gas n remain constant. Therefore, the pressure P is directly proportional to the temperature T. By actively cooling the pipeline through the refrigeration system, according to the above formula, the decrease in temperature T directly leads to a synchronous decrease in gas pressure P. Gas molecules are more densely distributed within a fixed space, resulting in a significant increase in gas density. Since the refractive index of a gas is proportional to its density, and the control precision of the refrigeration system is far greater than that of relying on the air compressor, the fluctuation of the refractive index is controlled within a very small range, achieving precise control of the gas refractive index.

[0026] Ultimately, this invention constructs a closed-loop control circuit based on high-precision monitoring and control of the wrench head by directly feeding back the high-precision signal output by the interference detection system to the hydraulic control system of the hydraulic torque wrench system. This fundamentally reduces the error caused by the progressive accumulation of mechanical clearance, enabling the torsional straightening accuracy of aero-blades to break through the limits of traditional torsional straightening systems and stably meet the stringent requirements at the micrometer level.

[0027] The preferred orthopedic technique is as follows:

[0028] S1: A standard aircraft blade is installed in the support, the wrench head holds the standard aircraft blade, and the laser interferometer projects the measurement beam and the reference beam onto the diffuse reflection plane of the wrench head to obtain a preliminary interference image of the end position of the wrench head.

[0029] S2: Adjust the pressure and density of the gas in the tube by regulating the speed of light with an air compressor, adjust the temperature of the gas by using a refrigeration system, and precisely adjust the optical path difference to adjust the preliminary interference image into a standard interference image.

[0030] S3: Remove the standard aircraft blade, install the aircraft blade to be corrected, use the wrench head to correct the aircraft blade to be corrected, and obtain real-time interference images with the laser interferometer.

[0031] S4: The interference detection system of the laser interferometer compares the real-time interference image with the standard interference image until the real-time interference image and the standard interference image are within the tolerance range, then controls the hydraulic torque wrench system to stop the correction.

[0032] By adopting the technical scheme, the standard aviation blade is used for system calibration, that is, a preliminary interference image of the wrench head at a target position is acquired, the gas in the optical speed adjustment tube is adjusted actively, the interference image generated by the interference detection system is calibrated accurately to an ideal state, and through the step, the hydraulic torque wrench system is no longer dependent on indirect readings on any mechanical transmission chain in the actual straightening process of the aviation blade, but directly takes the calibrated standard interference image as a reference. In the straightening process, the difference between the current interference state and the standard state is compared in real time, when the real-time interference image and the standard interference image reach the tolerance range, the interference detection system sends a signal, and the hydraulic torque wrench system receives the signal and stops the straightening of the aviation blade. The process based on end direct measurement and comparison with the reference fundamentally solves the problem of error transmission and superposition in the traditional straightening system, ensures that the straightening result of each aviation blade is highly consistent with the standard aviation blade, and greatly improves the qualification rate and reliability of the product.

[0033] Preferably, the diffuse reflection plane is formed on the surface of the wrench head by spraying or bonding a layer of diffuse reflection material.

[0034] By adopting the technical scheme, a diffuse reflection plane with low cost, simple process and high reliability is provided. The scheme avoids complex surface finishing on the wrench head body, and can be completed only by mature spraying or bonding process, greatly reducing the manufacturing difficulty and production cost.

[0035] Preferably, the wrench head is sprayed with black paint around the circumference of the diffuse reflection plane.

[0036] By adopting the technical scheme, the black paint can maximize the absorption of stray light reflected from the environment and other parts of the wrench head, effectively suppress the stray light into the optical collimation system, and significantly improve the accuracy of the interference signal.

[0037] Preferably, the refrigeration system adopts a liquid nitrogen evaporation refrigeration system.

[0038] By adopting the technical scheme, the liquid nitrogen evaporation refrigeration system can provide extremely low refrigeration temperature and extremely high heat absorption efficiency, which enables the refrigeration system to control the temperature of the gas in the optical speed adjustment tube extremely quickly and accurately, thereby realizing higher precision and stable control of the refractive index of the gas. The temperature control precision beyond the conventional refrigeration mode suppresses the temperature disturbance caused by the environment and the compressed gas of the air compressor, thereby controlling the refractive index fluctuation of the gas in the optical path within a very small range, ensuring the long-term absolute reliability of the measurement reference in the high-precision straightening process of the aviation blade, and meeting the stringent requirements of aviation manufacturing on ultra-stable measurement environment.

[0039] Preferably, the gas container stores xenon gas.

[0040] By adopting the above technical scheme, the xenon gas, which has high refractive index temperature coefficient and extremely stable chemical properties, is selected, so that the risk of flammability and explosion of the gas and the risk of chemical reaction with the pipeline material are completely avoided while ensuring that the system has high control sensitivity, and the optimal gas medium selection is provided for realizing high-precision, high-safety and long-term stability of the refractive index active control, which is very suitable for high-precision aviation blade straightening.

[0041] Preferably, the contact surface of the support for fixing the aviation blade is provided with a protective pad, and the protective pad is made of flexible wear-resistant material, and the protective pad is used to protect the surface of the aviation blade.

[0042] By adopting the above technical scheme, the protective pad effectively disperses and absorbs the clamping force generated by the rigid clamping through its own slight deformation, effectively prevents scratches or indentations on the surface of the aviation blade caused by rigid contact during straightening, and avoids local damage to the aviation blade caused by stress concentration.

[0043] Preferably, an inclination sensor is arranged on the support, and the inclination sensor is used to detect the initial installation posture of the aviation blade.

[0044] The inclination sensor is electrically connected with the hydraulic torque wrench system.

[0045] When the inclination sensor detects that the aviation blade is within the tolerance range of the vertical posture, the hydraulic torque wrench system is allowed to start.

[0046] By adopting the above technical scheme, by detecting the initial installation posture of the aviation blade, the risk of straightening angle error caused by the inclined installation of the aviation blade is completely eliminated from the source, the risk of human operation error is reduced, and it is ensured that each straightening process can be stably repeated and the straightening result is reliable.

[0047] Preferably, the length of the hollow straight pipe is 5-10 cm, the diameter of the inner cavity of the hollow straight pipe is 3-6 cm, and the inner wall of the hollow straight pipe adopts a black frosted structure.

[0048] By adopting the above technical scheme, the length of the hollow straight pipe is 5-10 cm, and the diameter of the inner cavity is 3-6 cm, which ensures that the hollow straight pipe has sufficient depth and sufficient inner cavity diameter, can effectively physically shield and preliminarily screen the large-angle scattered light returned from the diffuse reflection plane, and only allows light close to parallel to pass, thereby achieving the best balance between the compactness of the optical system and the stray light suppression effect.

[0049] In addition, the inner wall of the hollow straight pipe adopts a black frosted structure matched with the size of the hollow straight pipe, which can further screen out stray light and fundamentally guarantee the micron-level precision of angle measurement in the aviation blade straightening process.

[0050] In summary, the present application includes at least one of the following beneficial technical effects:

[0051] 1. The present application creatively discards the independent reference mirror necessary for the traditional interferometer, synchronously projects the measurement beam and the reference beam to the diffuse reflection plane of the wrench head, so that when the wrench head inevitably shakes slightly during rotation, the measurement beam and the reference beam can change synchronously, thereby avoiding errors introduced in interference detection, and greatly improving the perception accuracy of the wrench head;

[0052] 2. The present application introduces a specially designed optical collimation system, which performs secondary screening on the light reflected by the wrench head, so that the light that has lost phase correlation due to diffuse reflection regains coherence after collimation screening, successfully bypassing the inherent error chain of the traditional twist straightening system, and realizing high-precision direct measurement of the actual twist state of the wrench head;

[0053] 3. For the measurement error introduced by environmental factors on laser measurement, the present application fills a specific gas into the closed light speed adjustment pipe through an air compressor, preliminarily adjusts the gas density by changing the gas pressure, thereby laying a foundation for accurate control of the refractive index, and on this basis, the present application introduces a refrigeration system based on temperature sensor feedback control, which on the one hand eliminates the refractive index fluctuations caused by the temperature rise and subsequent temperature drop of the gas compressed by the air compressor; on the other hand, it realizes precise control of the refractive index of the gas through cooling. Based on the ideal gas state equation PV=nRT, in a closed pipeline, the volume V and the amount of gas substance n remain unchanged, so the pressure P and the temperature T are in a proportional relationship. According to the above formula, the decrease of temperature T will directly lead to the synchronous decrease of gas pressure P, and the gas molecules will be distributed more closely in the fixed space, that is, the gas density will increase significantly. The refractive index of the gas is proportional to the gas density, and the control accuracy of the refrigeration system is much higher than that of the air compressor, so the fluctuation of the refractive index is controlled in a very small range, and the refractive index of the gas is precisely controlled. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 is a schematic diagram of the overall structure of the aviation blade straightening torque wrench system according to an embodiment of the present application;

[0055] Figure 2 is a schematic diagram of the measurement beam and reference beam projection path according to an embodiment of the present application.

[0056] Reference numerals: 1, wrench head; 2, support; 3, diffuse reflection plane; 4, laser interferometer; 5, measuring beam; 6, reference beam; 7, stainless steel tube; 8, refrigeration tube; 9, inclination sensor. DETAILED DESCRIPTION

[0057] The following description will be made in conjunction with the accompanying drawings Figure 1 - the accompanying drawings Figure 2 The application is further described in detail.

[0058] The application discloses an aerofoil blade straightening torque wrench system.

[0059] Reference Figure 1 and Figure 2 The aerofoil blade straightening torque wrench system comprises a hydraulic torque wrench system, a support 2 for fixing the aerofoil blade, a laser interferometer 4 and an optical collimation system. The hydraulic torque wrench system serves as an actuator, comprising a wrench head 1 for clamping and twisting the aerofoil blade and an internal hydraulic control system having an input end for receiving external signals. To realize high-precision optical measurement, a diffuse reflection plane 3 is specially arranged on the side of the wrench head 1 for laser measurement, which can be conveniently formed on the surface of the wrench head 1 by spraying or bonding a layer of diffuse reflection material. In this embodiment, barium sulfate paint is selected as the diffuse reflection material and is sprayed on the wrench head 1. The barium sulfate paint has a diffuse reflectivity of more than 95% and good chemical stability. To further improve the signal-to-noise ratio, black paint is preferably sprayed on the periphery of the diffuse reflection plane 3 to effectively absorb ambient stray light.

[0060] The laser interferometer 4 of the application is the key to realizing high-precision measurement, which comprises a laser, a beam splitter and an interference detection system for processing interference signals. The beam splitter divides the incident light beam into a measuring beam 5 and a reference beam 6. The fundamental difference from the traditional laser interferometer is that the measuring beam 5 and the reference beam 6 are both projected onto the diffuse reflection plane 3 of the wrench head 1, and the measuring beam 5 and the reference beam 6 are respectively located at the left and right ends of the diffuse reflection plane 3. This design eliminates the reference mirror in the traditional laser interferometer and projects both beams onto the wrench head 1 to form a differential measurement system. When the wrench head 1 undergoes overall displacement or vibration, the optical paths of the two beams change synchronously, and this part of common-mode interference in the interference signal is cancelled. When the wrench head 1 is twisted, different optical path changes occur at both ends, and the differential signal is captured by the interference detection system, thereby directly outputting accurate information corresponding to the twist angle, effectively overcoming the measurement error introduced by overall displacement.

[0061] To ensure that the scattered light returned from the diffuse reflection plane 3, which has lost part of the coherence, can be effectively collected and used for interference, the optical collimation system in the application includes two hollow straight tubes parallel to the pointing direction of the measurement beam 5 and the reference beam 6, the length of the hollow straight tube is 5-10 cm, the diameter of the hollow straight tube cavity is 3-6 cm, and the inner wall of the hollow straight tube is black frosted to suppress internal reflection, in the embodiment, the length of the hollow straight tube is 5 cm, and the diameter of the hollow straight tube cavity is 3 cm, which ensures that the large-angle scattered light returned from the diffuse reflection plane can be shielded by the hollow straight tube, and only nearly parallel light is allowed to pass. Behind the two hollow straight tubes, an optical assembly system for adjusting the angle of light is arranged, which is formed by combining a prism, a mirror and a converging lens, which is responsible for collimating and phase adjusting the returned light beams transmitted back through the hollow straight tube, and finally guiding to the interference detection system for interference, and the detection signal output end of the interference detection system is connected to the signal input end of the hydraulic control system of the hydraulic torque wrench system, thereby constructing a direct closed-loop feedback control loop, so that the interference measurement result can guide the stop of the orthopedic action in real time.

[0062] An optical speed adjustment tube is arranged on the light path of the measurement beam 5, the optical speed adjustment tube includes a stainless steel tube 7, and the two ends of the stainless steel tube 7 are sealed by tempered glass plates to form a closed light path. Further, the application also includes an air compressor, the air outlet of the air compressor is connected to the inside of the optical speed adjustment tube, and the air inlet of the air compressor is connected to a gas container storing a specific gas, the specific gas needs to meet a high temperature coefficient of refractive index, and in the embodiment, xenon gas is preferred, which is an inert gas and does not chemically react with the stainless steel tube, so that the system can be ensured to operate stably for a long time. By adjusting the gas pressure in the optical speed adjustment tube through the air compressor, the gas density is changed to preliminarily change the refractive index of the gas. To further realize precise control, the application also provides a refrigeration system, which needs to meet the requirement of providing extremely high refrigeration efficiency to realize rapid and accurate regulation of temperature, and therefore, in the embodiment, a liquid nitrogen evaporation refrigeration system is preferred. The refrigeration pipe 8 of the refrigeration system is wrapped outside the stainless steel tube 7, and a temperature sensor is attached to the inner wall of the stainless steel tube 7, which is connected to the temperature signal input end of the microprocessor of the refrigeration system to form a temperature feedback control loop. Based on the ideal gas state equation, in the closed pipeline, the gas is actively cooled by the refrigeration system to realize precise regulation of the pressure and density of the gas, and the refractive index of the gas is proportional to the density, so that high-precision and high-stability control of the refractive index is finally realized.

[0063] In the aviation precision manufacturing technology, the step-by-step superposition of mechanical structure gap errors has a much greater influence on product quality and aviation safety than traditional mechanical manufacturing.

[0064] The present application aims at the orthopaedics of aviation blades, and provides a solution capable of bypassing a mechanical error chain and directly monitoring and controlling an execution end with high precision.

[0065] The orthopaedics process of the present application is as follows:

[0066] S1: a standard aviation blade is loaded in the support 2, the wrench head 1 clamps the standard aviation blade, the laser interferometer 4 projects the measuring beam 5 and the reference beam 6 to the diffuse reflection plane 3 of the wrench head 1, and a preliminary interference image of the end position of the wrench head 1 is obtained;

[0067] S2: the pressure and density of the gas in the light speed adjustment tube are adjusted by the air compressor, the temperature of the gas is adjusted by the refrigeration system, the optical path difference is precisely adjusted, and the preliminary interference image is adjusted to a standard interference image;

[0068] S3: the standard aviation blade is removed, and an aviation blade to be orthopaed is loaded, the wrench head 1 orthopaed the aviation blade to be orthopaed, and the laser interferometer 4 obtains a real-time interference image;

[0069] S4: the interference detection system of the laser interferometer 4 compares the real-time interference image with the standard interference image, until the real-time interference image and the standard interference image reach a tolerance range, and the hydraulic torque wrench system is controlled to stop orthopaed.

[0070] The core function of the orthopaedics process is to generate a standard interference image by placing a standard aviation blade, then orthopaed the aviation blade to be orthopaed with the standard interference image of the standard aviation blade as a target, and use the difference between the two interference images as a feedback signal, when the difference is small to indicate that the wrench head 1 has accurately reached the tolerance range of the target position, a signal is generated and transmitted to the hydraulic torque wrench system, instructing the hydraulic torque wrench system to stop the orthopaed action, and the orthopaedics process makes the system no longer rely on the indirect reading of the mechanical transmission chain, and further avoids errors.

[0071] In order to further ensure the orthopaedics precision of the aviation blade, a protective pad made of flexible wear-resistant material is arranged on the contact surface of the support 2 for fixing the aviation blade, in this embodiment, the protective pad is made of polyurethane, and the thickness of the protective pad is 3-5 mm, so as to prevent the blade surface from being damaged in the clamping process. In addition, an inclination sensor 9 can also be arranged on the support 2, which is used for detecting the initial installation posture of the aviation blade, and the inclination sensor 9 is electrically connected with the hydraulic torque wrench system, and only when the inclination sensor 9 detects that the aviation blade is in the tolerance range of the vertical posture, the hydraulic torque wrench system is allowed to start, so as to avoid the orthopaed angle error caused by the installation inclination from the source.

[0072] The implementation principle of the embodiment of the present application is as follows:

[0073] The aero blade orthopedic torque wrench system constructs an ultra-precision control system based on optical direct measurement and closed-loop feedback, and realizes micron-level orthopedic treatment of aero blades to completely avoid the gap and error difficult to eliminate in the traditional mechanical transmission chain.

[0074] The aero blade orthopedic torque wrench system discards the fixed reference mirror of the traditional interferometer, projects the measuring light beam 5 and the reference light beam 6 to the left and right ends of the diffuse reflection plane 3 of the wrench head 1, thereby converting the interferometer itself into a high-sensitivity relative displacement sensor. When the wrench head 1 has overall displacement or vibration, the optical paths of the two light beams change synchronously and cancel each other out during interference. When the wrench head 1 has differential displacement at the two ends due to torsion, an optical path difference is generated and is accurately captured by the interference detection system.

[0075] To ensure that the scattered light returned from the rough diffuse reflection surface can effectively participate in interference, the application filters and renews the light through the optical collimation system to restore its coherence. To further improve the absolute accuracy of the reference, the application introduces an active optical path control mechanism. By setting a light speed adjustment tube in the measurement light path and using an air compressor and a refrigeration system based on temperature feedback, the pressure and temperature of the specific gas in the tube are precisely controlled. According to the ideal gas state equation and the proportional relationship between the refractive index of the gas and the density, micron-level compensation and calibration of the refractive index of the gas and the optical path are realized.

[0076] Meanwhile, all the above technologies ultimately serve a "calibration-copying" type of closed-loop orthopedic process. The orthopedic process first uses a standard aero blade to establish a standard interference image as an absolute reference at the target position. In actual orthopedic treatment, the application no longer focuses on the indirect readings of any mechanical transmission chain, but directly compares the continuously collected real-time interference image with the standard interference image. The difference between the two is the direct input signal of the hydraulic control system. When the difference enters the tolerance range, indicating that the wrench head 1 has accurately reproduced the standard position, the hydraulic control system immediately issues a command to stop orthopedic treatment, thereby forming a direct feedback loop with the end optical signal as the only criterion.

[0077] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the basis of the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. An aircraft blade straightening torque wrench system comprising a hydraulic torque wrench system, the hydraulic torque wrench system comprising a wrench head (1) and a support (2) for fixing an aircraft blade, the hydraulic control system of the hydraulic torque wrench system having a signal input, characterized in that The wrench head (1) is provided with a diffuse reflection plane (3) on one side; Further comprising a laser interferometer (4); The laser interferometer (4) comprises a laser, a beam splitter and an interference detection system, the beam splitter divides the incident light beam into a measurement beam (5) and a reference beam (6); The measurement beam (5) and the reference beam (6) are both projected to the left and right ends of the diffuse reflection plane (3) of the wrench head (1); Further comprising an optical collimation system, the optical collimation system comprises two hollow straight tubes, the two hollow straight tubes are respectively parallel to the pointing directions of the measurement beam (5) and the reference beam (6); The rear of the two hollow straight tubes is respectively provided with an optical component system for adjusting the angle of light; The two optical component systems respectively adjust the return beams transmitted by the two hollow straight tubes and introduce the return beams into the interference detection system for interference; The detection signal output end of the interference detection system is connected to the signal input end of the hydraulic control system, so as to realize the feedback control of the interference detection system on the hydraulic torque wrench system; An optical speed adjustment tube is arranged on the light path of the measurement beam (5), the optical speed adjustment tube comprises a stainless steel tube (7), and the two ends of the stainless steel tube (7) are sealed by tempered glass plates; Further comprising an air compressor, the air outlet of the air compressor is communicated with the inside of the optical speed adjustment tube, and the air inlet of the air compressor is connected to a gas container; Further comprising a refrigeration system, the refrigeration pipe (8) of the refrigeration system is wrapped outside the stainless steel tube (7), and a temperature sensor is attached to the inner wall of the stainless steel tube (7); The temperature sensor is connected to the temperature signal input end of the microprocessor of the refrigeration system, so as to realize the feedback control of the temperature.

2. The aircraft blade straightening torque wrench system of claim 1, wherein, The orthopedic process is as follows: S1: a standard aviation blade is loaded in the support (2), the wrench head (1) clamps the standard aviation blade, the laser interferometer (4) projects the measurement beam (5) and the reference beam (6) to the diffuse reflection plane (3) of the wrench head (1), and a preliminary interference image of the end position of the wrench head (1) is obtained; S2: the pressure and density of the gas in the optical speed adjustment tube are adjusted by the air compressor, the temperature of the gas is adjusted by the refrigeration system, the optical path difference is precisely adjusted, and the preliminary interference image is adjusted to a standard interference image; S3: the standard aviation blade is removed, an aviation blade to be orthopedic is loaded, the wrench head (1) orthopedically processes the aviation blade to be orthopedic, and the laser interferometer (4) obtains a real-time interference image; S4: the interference detection system of the laser interferometer (4) compares the real-time interference image with the standard interference image, and when the real-time interference image and the standard interference image reach a tolerance range, the hydraulic torque wrench system is controlled to stop orthopedic.

3. The aircraft blade straightening torque wrench system of claim 1, wherein, The diffuse reflection plane (3) is formed on the surface of the wrench head (1) by spraying or bonding a layer of diffuse reflection material.

4. The aircraft blade straightening torque wrench system of claim 1, wherein, The wrench head (1) is sprayed with black paint around the diffuse reflection plane (3).

5. The aircraft blade straightening torque wrench system of claim 1, wherein, The refrigeration system adopts a liquid nitrogen evaporation refrigeration system.

6. The aircraft blade straightening torque wrench system of claim 1, wherein, The gas container stores xenon gas.

7. The aircraft blade straightening torque wrench system of claim 1, wherein, The contact surface of the support (2) for fixing the aviation blade is provided with a protective pad, the protective pad is made of flexible wear-resistant material, and the protective pad is used for protecting the surface of the aviation blade.

8. The aircraft blade straightening torque wrench system of claim 1, wherein, An inclination sensor (9) is arranged on the support (2), and the inclination sensor (9) is used for detecting the initial installation posture of the aviation blade. The inclination sensor (9) is electrically connected with the hydraulic torque wrench system; When the inclination sensor (9) detects that the aviation blade is in the tolerance range of the vertical posture, the hydraulic torque wrench system allows to start.

9. The aircraft blade straightening torque wrench system of claim 1, wherein, The length of the hollow straight pipe is 5-10 cm, the diameter of the inner cavity of the hollow straight pipe is 3-6 cm, and the inner wall of the hollow straight pipe adopts a black frosted structure.

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