Aircraft product part online measurement mechanism and measurement method

Abstract

The application relates to an aviation product part online measurement mechanism and a measurement method. At present, manual measurement is mainly adopted in aviation product tool assembly, unified measurement specification and process are lacked, only the experience of operators is relied on for processing, efficiency is low, measurement results are obviously inconsistent, and the method is not suitable for modern aviation product manufacturing requirements. The application provides an aviation product part online measurement mechanism and a measurement method aiming at the above problems, which are composed of a control ECU module, a detection card plate, a detection card plate profile, a feature data acquisition unit, a motion mechanism, a Y-shaped joint, a feature block, a cylinder assembly, a limiting block and a connecting plate. The detection card plate limiting position is taken as a measurement position, the detection card plate reference is taken as a measurement reference, the actual positions of three feature key points of one profile of an aviation product part are measured, actual data and deviation data from a theoretical position are displayed in real time, a certain degree of automatic measurement is realized, and the method has the characteristics of rapidness and high repeated positioning precision.

Description

TECHNICAL FIELD

[0001] The present application relates to an online measurement mechanism and measurement method for an aviation product part. BACKGROUND

[0002] At present, the shape design of an aviation product is to apply aerodynamic principles to make the lift high, the resistance small, the stability good, and the maneuverability good. For example, the fuselage is as streamlined as possible, and protrusions are reduced to reduce the resistance. The shape of the wing is also scientifically configured according to the use occasion and performance requirements. Therefore, the importance of the shape precision of the aviation product to the overall performance is self-evident. Most aviation manufacturing enterprises in China still rely on the detection method of process equipment such as mold lines and templates for the detection of the shape of the aviation product. The present application is to design an online measurement mechanism in some complex detection environments in the assembly tooling of the aviation product parts. SUMMARY

[0003] The technical problem to be solved by the present application is that in the assembly tooling of the aviation product parts, due to the limitation of the product structure, the shape is not only large but also has a complex spatial profile and related key point detection, which requires a lot of manpower and material resources. The manual measurement method lacks unified measurement specifications and measurement processes, and only relies on the personal experience of workers to process, which is low in efficiency and inconsistent in measurement results, and is not sufficient to meet the requirements of modern aviation product manufacturing. On the other hand, for the detection of large-size and large-range parts such as aircraft skin, a more efficient, fast, high-precision, high-repetition positioning precision and automatic measurement method is needed to complete the detection. The present application is aimed at the above problems, and is attached to the assembly tooling, and the tooling positioning shape is taken as the basis, and the datum of the tooling positioning mechanism (detection card) is taken as the system measurement datum to measure the real-time deviation data of the actual position and the theoretical position of part of the key points in the aviation product. In practical application, the shape profile of the aircraft skin product can be completely measured by expansion and combination, the precision is not more than ±0.02mm, and the positive and negative deviation values of the real-time product are displayed.

[0004] The purpose of the present application is to provide an online measurement mechanism for an aviation product part. A segment of a circular arc profile of one profile of an aviation product part is selected as a typical representative of the profile, and three typical feature points are selected from the segment of the circular arc profile to represent the profile, and three feature data acquisition units are used to complete the acquisition of the three typical feature points, so as to realize the extraction of product feature points in a complex environment and data analysis and processing, thereby providing an online measurement mechanism and measurement method for an aviation product part, and realizing a high-precision, high-efficiency and automatic measurement method and measurement process.

[0005] The technical solution adopted by the present application to solve the technical problem is:

[0006] An online measurement mechanism for aviation product parts is composed of a detection card (1), a feature data acquisition unit (2), a motion mechanism (3), a Y-shaped joint two (4), a positioning pin one (5), a fastening nut (6), a Y-shaped joint two (7), a cylinder assembly (8), an adapter plate one (9), a support one (10), a connecting plate one (11), a support two (12), a limiting block one (13), a limiting block two (14), a feature block (15), a detection card profile (16), a control ECU module (17), and a gas valve, characterized in that: the online measurement mechanism is mainly composed of the motion mechanism (3), three feature data acquisition units (2), and the control ECU module (17); the control ECU module (17) is bidirectionally connected with the feature data acquisition unit (2) and the motion mechanism (3); the motion mechanism (3) is rigidly connected with the three feature data acquisition units (2) through positioning pins and screws; the three feature data acquisition units (2) are linked with the motion mechanism (3); the control ECU module (17) directly controls the input signals of the motion mechanism (3) and the three feature data acquisition units (2), and processes, stores, and displays the collected measurement data; and the three feature data acquisition units (2) cooperatively collect the coordinate data of three typical feature points of a typical representative circular arc profile in one profile of aviation product parts; and the coordinate data of the three typical feature points are the most basic data for determining a reference circular arc in the profile.

[0007] The motion mechanism (3) is composed of a detection card plate (1), a Y-shaped joint (4), a positioning pin (5), a fastening screw (6), a Y-shaped joint (7), a cylinder assembly (8), an adapter plate (9), a support (10), a connecting plate (11), a support (12), a limiting block (13), a limiting block (14), a feature block (15), and a detection card plate profile (16). The detection card plate (1) is hingedly connected with the Y-shaped joint (4) by positioning pins and screws. The Y-shaped joint (4) is rigidly connected with the piston rod of the cylinder assembly (8). The detection card plate (1) is rigidly connected with the connecting plate (11) by positioning pins and screws. The detection card plate (1) is rigidly connected with three feature data acquisition units (2) by positioning pins and fastening screws. The three feature data acquisition units (2) are linked with the motion mechanism (3). The detection card plate (1) is rigidly connected with the limiting block (14) by positioning pins and screws. The support (12) is rigidly connected with the limiting block (13) by positioning pins and screws. The support (12) is hingedly connected with the connecting plate (11) by positioning pins and fastening screws (6). The Y-shaped joint (7) is hingedly connected with the piston rod of the cylinder assembly (8). The Y-shaped joint (7) is hingedly connected with the pneumatic rod of the cylinder assembly (8). The support (10) is rigidly connected with the cylinder assembly (8) through the adapter plate (9) by positioning pins and screws. The detection card plate (1) is composed of a detection card plate profile (16), positioning pin holes, and screw mounting holes. The detection card plate profile (16) is consistent with the numerical model of the measured aviation product part profile.

[0008] The feature data acquisition unit (2) is composed of a connecting plate (2-1), an outlet joint (2-2), an inlet joint (2-3), a telescopic cylinder (2-4), a support (2-5), a distance measuring sensor (2-6), a shell (2-7), a connecting plate (2-8), a support (2-9), a connecting plate (2-10), and a feature block (15). The connecting plate (2-1) is rigidly connected with the feature block (15), the connecting plate (2-10), and the telescopic cylinder (2-4) by positioning pins and screws. The connecting plate (2-10) is rigidly connected with the distance measuring sensor (2-6). The distance measuring sensor (2-6) is a rebound LVDT differential displacement sensor. The feature block (15) directly controls the telescopic action of the telescopic cylinder (2-4) and realizes synchronous linkage and signal acquisition through the distance measuring sensor (2-6). The signals are returned to the control ECU module (17) for data processing. The distance measuring sensor (2-6) is rigidly connected with the connecting plate (2-8) through the supports (2-5) and (2-9), positioning pins, and screws. The telescopic cylinder (2-4) is rigidly connected with the outlet joint (2-2), the inlet joint (2-3), and the connecting plate (2-8). The shell (2-7) is rigidly connected with the connecting plate (2-8) by screws.

[0009] The measurement method of the aviation product part online measurement mechanism specifically comprises the following process steps:

[0010] (1) In order to obtain the aviation product part surface data and ensure accurate positioning and installation in assembly, a characteristic surface is selected as a typical representative, a characteristic arc is the most basic data of a characteristic surface, and three characteristic points are the most basic data of a characteristic arc. By taking the positioning limit position of the detection card as the measurement position and the detection card reference as the measurement reference, a typical characteristic surface in the aviation product part is selected as the representative surface and is designated as the measurement surface. A typical arc is selected as the representative in a typical characteristic surface, and three characteristic points are selected to represent the arc. Thus, the actual position measurement of the three key characteristic points is used to obtain the installation data of the aviation product part in the assembly process;

[0011] (2) The aviation product part button to be measured is selected, a request command is sent to the control ECU module (17), after being processed by the control ECU module (17), the left end of the three-position five-way electromagnetic reversing valve of the cylinder assembly (8) is powered, the cylinder assembly (8) drives the motion mechanism (14), the detection card (1), the characteristic data acquisition unit (2), the limit block two (14), the characteristic block (15), and the detection card surface (16) to move to the joint position of the limit block two (14) and the limit block one (13), the three-position five-way electromagnetic reversing valve of the cylinder assembly (8) stops power supply and is in the middle position, the cylinder assembly locking switch is opened to lock the motion mechanism (14), and the positioning limit position of the motion mechanism (14) is the measurement position;

[0012] (3) Select the measurement of the aviation product parts button, send a request command to the control ECU module (17), after processing by the control ECU module (17), control the two-position five-way electromagnetic reversing valve left end of the telescopic cylinder (2-4) of the characteristic data acquisition unit (2) to supply power, the three telescopic cylinders (2-4) are extended to drive the characteristic block (15), the connecting plate two (2-1), the connecting plate five (2-10), and the distance sensor (2-6) to be linked to the surface of the measured product, contact the surface of the measured product in the stress-free state, obtain the signal transmission to the ECU module (17), the signal acquisition is 3 characteristic point coordinate data of a section of characteristic circular arc surface of one characteristic surface, after the data acquisition is completed, the two-position five-way electromagnetic reversing valve of the telescopic cylinder (2-4) of the characteristic data acquisition unit (2) is not supplied power at both ends, the telescopic cylinder (15-4) stops moving and is in a pressure maintaining state, after the state is stable, the worker observes the real-time data on the touch screen, displays the positive and negative deviation values of the measured product and the theoretical position of the product, records the completion, and then presses the back button, the two-position five-way electromagnetic reversing valve right end of the telescopic cylinder (2-4) of the characteristic data acquisition unit (2) is powered, the three telescopic cylinders (2-4) are retracted, the telescopic cylinder (2-4) drives the characteristic block (15), the connecting plate two (2-1), the connecting plate five (2-10), and the distance sensor (2-6) to be linked to the back, the telescopic cylinder (2-4) returns to the initial limit block position, the two-position five-way electromagnetic reversing valve is not powered and stops moving.

[0013] (4) The right end of the three-position five-way electromagnetic reversing valve of the cylinder assembly (8) is powered, the cylinder assembly (8) drives the moving mechanism (14), the detection card (1), the characteristic data acquisition unit (2), the limit block two (14), the characteristic block (15), and the detection card surface (16) to be linked to the initial position, the three-position five-way electromagnetic reversing valve of the cylinder assembly (8) is not powered to the middle position, the cylinder assembly (8) stops moving, and the measured product is removed, and the measurement is completed. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the present application.

[0015] Figure 2 It is a schematic diagram of the moving mechanism (3) of the present application.

[0016] Figure 3 It is a schematic diagram of the characteristic data acquisition unit (2) of the present application.

[0017] Figure 4 It is a schematic diagram of the signal acquisition and processing control principle of the present application.

[0018] 1-detection card plate, 2-feature data acquisition unit, 3-mechanism, 4-Y joint two, 5-positioning pin one, 6-fastening nut, 7-Y joint two, 8-cylinder assembly, 9-adapter plate one, 10-support one, 11-connection plate one, 12-support two, 13-limiting block one, 14-limiting block two, 15-feature block, 16-detection card plate profile, 17-control ECU module

[0019] 2-1-connection plate two, 2-2-gas outlet joint, 2-3-gas inlet joint, 2-4-telescopic cylinder, 2-5-support three, 2-6-distance measuring sensor, 2-7-housing, 2-8-connection plate three, 2-9-support four, 2-10-connection plate five DETAILED DESCRIPTION

[0020] The technical scheme is realized through the following technical measures and is further described as follows:

[0021] Figure 1 is a schematic diagram of the three-dimensional structure of the present application, Figure 4 is a schematic diagram of the signal acquisition and processing control principle, an online measurement mechanism for aviation product parts, composed of a detection card plate (1), a feature data acquisition unit (2), a mechanism (3), a Y joint two (4), a positioning pin one (5), a fastening nut (6), a Y joint two (7), a cylinder assembly (8), an adapter plate one (9), a support one (10), a connection plate one (11), a support two (12), a limiting block one (13), a limiting block two (14), a feature block (15), a detection card plate profile (16), and a control ECU module (17), characterized in that: the online measurement mechanism is mainly composed of a mechanism (3), three feature data acquisition units (2), and a control ECU module (17); the control ECU module is bidirectionally connected with the feature data acquisition unit (2) and the mechanism (3); the mechanism (3) is rigidly connected with the three feature data acquisition units (2) through positioning pins and screws; the three feature data acquisition units (2) are linked with the mechanism (3); the control ECU module (17) directly controls the cylinder assembly (8) of the mechanism (3), the feature block (15) of the three feature data acquisition units (2), and the input signal, and performs data processing, storage, and display on the collected measurement data; the three feature data acquisition units (2) cooperatively complete the collection of coordinate data of three typical feature points of a typical representative circular arc profile in one profile of an aviation product part; the three typical feature point coordinate data are the most basic and effective method for determining a reference circular arc in the profile; the three feature data acquisition units (2) start measuring only after the mechanism (3) and the three feature data acquisition units (2) are linked to the limiting block one (13) and the limiting block two (14) by the cylinder assembly (8).

[0022] Figure 2 is the schematic diagram of the motion mechanism (3) of the present application, the motion mechanism (3) is mainly composed of detection card (1), Y joint two (4), positioning pin one (5), fastening screw (6), Y joint two (7), cylinder assembly (8), adapter plate one (9), support one (10), connecting plate one (11), support two (12), limit block one (13), limit block two (14), feature block (15), detection card profile (16), detection card (1) is hinged with Y joint two (4) by positioning pin and screw, Y joint two (4) is rigidly connected with the piston rod of cylinder assembly (8), detection card (1) is rigidly connected with adapter plate one (11) by positioning pin and screw, detection card (1) is rigidly connected with three feature data acquisition units (2) by positioning pin and fastening screw, three feature data acquisition units (2) are linked with motion mechanism (3); detection card (1) is rigidly connected with limit block two (14) by positioning pin and screw; support two (12) is rigidly connected with limit block one (13) by positioning pin and screw, support two (12) is hingedly connected with connecting plate one (11) by positioning pin and fastening screw (6); Y joint two (7) is hingedly connected with the piston rod of cylinder assembly (8), Y joint two (7) is hingedly connected with the pneumatic rod of cylinder assembly (8); support one (10) is rigidly connected with cylinder assembly (8) through adapter plate one (9) by positioning pin and screw, detection card (1) is composed of detection card profile (16), positioning pin hole and screw mounting hole, detection card profile (16) is consistent with the numerical model of the profile of the aviation product parts.

[0023] Figure 3 is the schematic diagram of the feature data acquisition unit (2) of the present application, Figure 4It is the schematic diagram of signal acquisition processing control principle of the application, the characteristic data acquisition unit (2) is composed of connecting plate two (2-1), gas outlet joint (2-2), gas inlet joint (2-3), telescopic air cylinder (2-4), support three (2-5), distance measuring sensor (2-6), shell (2-7), connecting plate three (2-8), support four (2-9), connecting plate five (2-10), characteristic block (15), connecting plate two (2-1) is rigidly connected with characteristic block (15), connecting plate five (2-10), telescopic air cylinder (2-4) by positioning pin and screw, connecting plate five (2-10) is rigidly connected with distance measuring sensor (2-6), distance measuring sensor (2-6) is rigidly connected with connecting plate three (2-8) through support three (2-5), support four (2-9), positioning pin and screw, telescopic air cylinder (2-4) is rigidly connected with gas outlet joint (2-2), gas inlet joint (2-3) and connecting plate three (2-8), shell (2-7) is rigidly connected with connecting plate three (2-8) through screw; the control ECU module (17) controls the cylinder assembly (8) to drive the motion mechanism (3), three characteristic data acquisition units (2) to the specified limit position after the limit block one (13) and the limit block two (14) are engaged as the measurement position, the characteristic block (15) directly controls the telescopic action of the telescopic air cylinder (2-4), and the signal of the distance measuring sensor (2-6) is collected, and the signal is returned to the control ECU module (17) for data processing, storage and display.

[0024] The measurement method of the online measurement mechanism of the aviation product parts, specifically includes the following process steps:

[0025] (1) In order to obtain the aviation product part surface data, so as to ensure accurate positioning and installation in assembly, a characteristic surface is selected as a typical representative, a characteristic arc is the most basic data of a characteristic surface, three characteristic points are the most basic data of a characteristic arc, by taking the limit position of the detection card as the measurement position and the detection card reference as the measurement reference, a typical characteristic surface of the aviation product part is selected as the representative surface and is specified as the measurement surface, a typical arc is selected as the representative on a typical characteristic surface, three characteristic points are selected to represent the arc, so that the actual position measurement of the three key characteristic points is used to obtain the installation data of the aviation product part in the assembly process;

[0026] (2) Select the button of preparing to measure the aviation product parts, request the command to the control ECU module (17), after the processing of the control ECU module (17), control the left end of the three-position five-way electromagnetic reversing valve of the cylinder assembly (8) to supply power, the cylinder assembly (8) drives the moving mechanism (14), the detection card plate (1), the feature data acquisition unit (2), the limit block two (14), the feature block (15), the detection card plate profile (16) linkage, moves to the limit block two (14) and the limit block one (13) joint position, the three-position five-way electromagnetic reversing valve of the cylinder assembly (8) stops power supply in the middle position, the cylinder assembly locking switch opens the locking moving mechanism (14), the positioning limit position of this moving mechanism (14) is the measurement position;

[0027] (3) Select the button of measuring the aviation product parts, send a request command to the control ECU module (17), after the processing of the control ECU module (17), control the left end of the two-position five-way electromagnetic reversing valve of the telescopic cylinder (2-4) of the feature data acquisition unit (2) to supply power, the three telescopic cylinders (2-4) extend to drive the feature block (15), the connecting plate two (2-1), the connecting plate five (2-10), the distance sensor (2-6) linkage to extend to the surface of the measured product, contact the surface of the measured product in the stress-free state, obtain the signal transmission to the ECU module (17), the obtained signal is the three feature point coordinate data of a section of feature arc surface of one feature surface, after the data acquisition is completed, the two-position five-way electromagnetic reversing valve of the telescopic cylinder (2-4) of the feature data acquisition unit (2) is not supplied power at both ends, the telescopic cylinder (15-4) stops moving in the pressure maintaining state, after the state is stable, the worker observes the real-time data on the touch screen, displays the positive and negative deviation numerical value of the measured product and the theoretical position of the product, records the completion, presses the back button, controls the right end of the two-position five-way electromagnetic reversing valve of the telescopic cylinder (2-4) of the feature data acquisition unit (2) to supply power, the three telescopic cylinders (2-4) retreat, the telescopic cylinder (2-4) drives the feature block (15), the connecting plate two (2-1), the connecting plate five (2-10), the distance sensor (2-6) linkage to retreat, the telescopic cylinder (2-4) cylinder returns to the initial limit block position, the two-position five-way electromagnetic reversing valve is not supplied power, stops moving.

[0028] (4) Control the right end of the three-position five-way electromagnetic reversing valve of the cylinder assembly (8) to supply power, the cylinder assembly (8) drives the moving mechanism (14), the detection card plate (1), the feature data acquisition unit (2), the limit block two (14), the feature block (15), the detection card plate profile (16) linkage to return to the initial position, the three-position five-way electromagnetic reversing valve of the cylinder assembly (8) is not supplied power to return to the middle position, the cylinder assembly (8) stops moving, the measured product is removed, the measurement is completed.

Claims

1. An online measurement mechanism for aviation product parts, comprising a detection card (1), a feature data acquisition unit (2), a motion mechanism (3), a Y-shaped joint I (4), a positioning pin I (5), a fastening screw (6), a Y-shaped joint II (7), a cylinder assembly (8), an adapter plate I (9), a support I (10), a connecting plate I (11), a support II (12), a limiting block I (13), a limiting block II (14), a feature block (15), a detection card profile (16), a control ECU module (17), and a gas valve, characterized in that: The online measuring mechanism is mainly composed of a moving mechanism (3), three feature data acquisition units (2) and a control ECU module (17); the control ECU module (17) is in bidirectional communication connection with the feature data acquisition units (2) and the moving mechanism (3); the moving mechanism (3) is rigidly connected with the three feature data acquisition units (2) through positioning pins and screws; the three feature data acquisition units (2) are linked with the moving mechanism (3); the control ECU module (17) directly controls the input signals of the moving mechanism (3) and the three feature data acquisition units (2), and processes, stores and displays the collected measurement data; the three feature data acquisition units (2) cooperatively collect the coordinate data of three typical feature points of a typical representative circular arc section of one profile of an aviation product component; the coordinate data of the three typical feature points are the most basic data for determining the reference circular arc in the profile; the moving mechanism (3) is composed of a detection card (1), a Y-shaped joint (4), a positioning pin (5), a fastening screw (6), a Y-shaped joint (7), a cylinder assembly (8), an adapter plate (9), a support (10), a connecting plate (11), a support (12), a limiting block (13), a limiting block (14), a feature block (15) and a detection card profile (16); the detection card (1) is hingedly connected with the Y-shaped joint (4) through positioning pins and screws; the Y-shaped joint (4) is rigidly connected with the piston rod of the cylinder assembly (8); the detection card (1) is rigidly connected with the connecting plate (11) through positioning pins and screws; the detection card (1) is rigidly connected with the three feature data acquisition units (2) through positioning pins and fastening screws; the three feature data acquisition units (2) are linked with the moving mechanism (3); the detection card (1) is rigidly connected with the limiting block (14) through positioning pins and screws; the support (12) is rigidly connected with the limiting block (13) through positioning pins and screws; the support (12) is hingedly connected with the connecting plate (11) through positioning pins and fastening screws (6); the Y-shaped joint (7) is hingedly connected with the piston rod of the cylinder assembly (8); the Y-shaped joint (7) is hingedly connected with the pneumatic rod of the cylinder assembly (8); the support (10) is rigidly connected with the cylinder assembly (8) through the adapter plate (9) and positioning pins and screws; the detection card (1) is composed of a detection card profile (16), a positioning pin hole and a screw mounting hole; the detection card profile (16) is consistent with the numerical model of the profile of the aviation product component. The characteristic data acquisition unit (2) is composed of connecting plate two (2-1), gas outlet joint (2-2), gas inlet joint (2-3), telescopic air cylinder (2-4), support three (2-5), distance measuring sensor (2-6), shell (2-7), connecting plate three (2-8), support four (2-9), connecting plate five (2-10) and characteristic block (15). The connecting plate two (2-1) is rigidly connected with the characteristic block (15), the connecting plate five (2-10) and the telescopic air cylinder (2-4) by positioning pins and screws. The connecting plate five (2-10) is rigidly connected with the distance measuring sensor (2-6). The characteristic block (15) directly controls the telescopic action of the telescopic air cylinder (2-4) and realizes synchronous linkage and signal acquisition through the distance measuring sensor (2-6). The signals are returned to the control ECU module (17) for data processing. The distance measuring sensor (2-6) is rigidly connected with the connecting plate three (2-8) through the support three (2-5), the support four (2-9), positioning pins and screws. The telescopic air cylinder (2-4) is rigidly connected with the gas outlet joint (2-2), the gas inlet joint (2-3) and the connecting plate three (2-8). The shell (2-7) is rigidly connected with the connecting plate three (2-8) by screws.

2. The measurement method of the online measurement mechanism of the aircraft product parts according to claim 1, characterized in that: The measurement method of the online measurement mechanism for the aviation product parts specifically includes the following process steps: (1) In order to obtain the aviation product part surface data and ensure accurate positioning and installation during assembly, a characteristic surface is selected as a typical representative. A characteristic arc is the most basic data of a characteristic surface, and three characteristic points are the most basic data of a characteristic arc. By positioning the limit position of the detection card as the measurement position and the detection card reference as the measurement reference, a typical characteristic surface of the aviation product part is selected as the representative surface and is designated as the measurement surface. Three characteristic points are selected to represent a typical arc, so that the actual position measurement of the three key characteristic points can obtain the installation data of the aviation product part during assembly; (2) Select the aviation product part measurement preparation button to request the control ECU module (17) for command. After the control ECU module (17) processes, the left end of the three-position five-way electromagnetic reversing valve of the cylinder assembly (8) is powered, the cylinder assembly (8) drives the movement mechanism (3), the detection card (1), the characteristic data acquisition unit (2), the limit block two (14), the characteristic block (15) and the detection card surface (16) to move to the joint position of the limit block two (14) and the limit block one (13). The three-position five-way electromagnetic reversing valve of the cylinder assembly (8) stops power supply and is in the middle position. The cylinder assembly locking switch opens to lock the movement mechanism (3). The positioning limit position of the movement mechanism (3) is the measurement position. (3) Select the measurement of the aviation product parts button, send a request command to the control ECU module (17), after processing by the control ECU module (17), control the two-position five-way electromagnetic reversing valve left end of the telescopic cylinder (2-4) of the feature data acquisition unit (2) to supply power, the three telescopic cylinders (2-4) are extended to drive the feature block (15), the connecting plate two (2-1), the connecting plate five (2-10), the distance sensor (2-6) linkage extension to the surface of the measured product, contact the measured product surface in the stress-free state, get the signal transmission to the ECU module (17), the acquisition signal is the three feature point coordinate data of a section of the feature circular arc surface of one feature surface, after the data acquisition is completed, the two ends of the two-position five-way electromagnetic reversing valve of the telescopic cylinder (2-4) of the feature data acquisition unit (2) are not supplied with power, the telescopic cylinder (2-4) stops moving and is in a pressure maintaining state, after the state is stable, the worker observes the real-time data on the touch screen, displays the positive and negative deviation values of the measured product and the theoretical position of the product, records the completion, presses the back button, supplies power to the right end of the two-position five-way electromagnetic reversing valve of the telescopic cylinder (2-4) of the feature data acquisition unit (2), the three telescopic cylinders (2-4) are retracted, the telescopic cylinder (2-4) drives the feature block (15), the connecting plate two (2-1), the connecting plate five (2-10), the distance sensor (2-6) linkage retreat, the telescopic cylinder (2-4) returns to the initial limit block position, the two-position five-way electromagnetic reversing valve is not supplied with power and stops moving; (4) Control the right end of the three-position five-way electromagnetic reversing valve of the cylinder assembly (8) to supply power, the cylinder assembly (8) drives the movement mechanism (3), the detection card (1), the feature data acquisition unit (2), the limit block two (14), the feature block (15), the detection card surface (16) linkage to return to the initial position, control the three-position five-way electromagnetic reversing valve of the cylinder assembly (8) to not supply power to the middle position, the cylinder assembly (8) stops moving, and the measured product is removed.

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