Intelligent detection device for butt-joint finish machining of large components of airplane

Abstract

The invention belongs to the technical field of aircraft assembly detection, and relates to an intelligent detection device for butt-joint finish machining of large components of an aircraft. The precise sliding table module and the high-precision displacement sensor are installed on the small tool, efficient and high-precision detection of finish machining of the large aircraft component is achieved, the precise sliding table module can achieve spatial positioning of the X axis, the Y axis and the Z axis, the displacement sensor is driven to move in a fixed route, and the displacement sensor is a high-precision magnetic induction displacement sensor. The measurement precision can reach 0.01 mm, the measurement precision requirement is met, measurement is carried out in a mode of touching the parts, and the surface flatness of the parts and the step difference between the parts can be measured. In the product production process, inspection personnel adopt the intelligent measurement device, so that the product quality control is improved in the aspects of measurement efficiency and measurement precision, the measurement mode is improved, and the upgrading and transformation of digital detection are realized.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft assembly detection, and relates to an intelligent detection device for finishing the docking of large aircraft components. Background Art

[0002] The fine machining of large aircraft parts can reduce the accumulated errors and coordination errors of parts, improve the relative position accuracy between aircraft parts, and in the process of docking and assembly, fine machining can ensure the manufacturing accuracy of the entire fuselage and the coordination and interchangeability of docking and assembly, which plays an important role in the quality of aircraft assembly. At the same time, the fine machining inspection of large parts is particularly important and is an important link in the assembly process of large aircraft parts. Through fine machining inspection, the defective position of parts can be found, the fault point can be handled in time, and serious quality problems can be avoided. Taking the finishing inspection of the central wing in the assembly plant as an example, due to the special structure of the aircraft and space limitations, a dial indicator is currently installed on the machine tool to measure the flatness of the central wing and outer wing mating surfaces, the distance from the lower wall panel reference hole to the end face of the part, and the step difference between the mating parts. The current measuring device mainly uses a pair of dial indicators with two standard gauges for comparative measurement. The measurement process requires the operator and inspector to cooperate in the measurement, and the machine tool needs to be manually cranked, the gauge needs to be zeroed and the standard gauge needs to be replaced multiple times, and finally manual numerical calculations are performed. This measurement method is complicated and cumbersome. The entire measurement process takes 1 hour, which is inefficient. In addition, the manual zeroing and manual calculations make it difficult to guarantee the measurement accuracy, and the measurement effect is not ideal.

[0003] At present, laser trackers, three-coordinate measuring machines and iGPS measurement systems are widely used digital measurement systems in the aviation manufacturing industry for measuring component finishing. Laser trackers and three-coordinate measuring machines have high measurement accuracy, but due to the complexity of their own measurement systems, large device structure dimensions, space limitations for layout and installation, and high measurement costs. The iGPS networking accuracy and measurement accuracy are slightly lower. It is further affected by the number of engineering transmitters, product structure, and layout of the digital assembly system. iGPS is more suitable for measurement environments with low measurement accuracy and large measurement range. At present, there is no dedicated detection system for the finishing of large aircraft components that can achieve high-precision and high-efficiency measurement, is not limited by layout and installation space, and can take cost factors into consideration. Therefore, there is an urgent need for a set of intelligent large component finishing detection devices.

[0004] This project uses precision slide modules and high-precision displacement sensors to achieve efficient and high-precision inspection of the finishing of large aircraft components, including surface flatness measurement of parts and step difference measurement between parts, to improve the shortcomings of current measuring devices and achieve the replacement and upgrading of detection equipment. Summary of the invention

[0005] In order to adapt to the high-quality development needs of aviation products, and to address the current problems of difficult to ensure measurement accuracy, low measurement efficiency and high cost in the finishing of large aircraft components, an intelligent detection device for the finishing of large components is invented. The device is connected and fixed with the aircraft structure by a small tooling, and a precision slide module and a high-precision displacement sensor are arranged on the small tooling. The precision slide module can realize three-axis spatial positioning, and the measurement accuracy of the displacement sensor can reach 0.01mm. The slide module and sensor are controlled by the electronic control system to realize automatic zeroing before measurement, and measurements are performed according to the fixed moving route set by the program. The device can measure the flatness of parts, the relative distance of parts and the step difference between parts, etc., to achieve efficient and high-precision detection.

[0006] The technical solution of the present invention is as follows:

[0007] Intelligent detection device for finishing of large aircraft parts, such as the attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 and attached Figure 4 As shown, it includes a fixed base, positioning bolts, locking nuts, X-axis slide, M4 screws, L-shaped supports, Z-axis slide, Y-axis slide, U-shaped bracket, displacement sensor, sensor nuts, connectors, power switch, reset button, electric control box, display screen, calibration block, M5 nuts, M5 bolts, power module, drive module and data processing module.

[0008] Among them, the fixed base, positioning bolts, locking nuts, M4 screws, L-shaped supports, U-shaped brackets, sensor nuts, connectors, calibration blocks, M5 nuts, and M5 bolts constitute the structural part of the device, and the X-axis slide, Z-axis slide, Y-axis slide, displacement sensor, power switch, reset button, electrical control box, display screen, power module, drive module, and data processing module constitute the electrical control part of the device.

[0009] The fixed base is made of alloy steel and is used to fix the overall measuring device. It has a compact structure and can be installed in a small area. It can be defined as a small tooling and is connected to the aircraft structure through two positioning bolts, two locking nuts. The calibration block is used to calibrate the sensor before the detection device is measured, and is also connected and fixed by positioning bolts and locking nuts. The outer diameter of the positioning bolt is 13mm, and the inner diameter of the locking nut is 13mm. It is matched and connected with the φ13 hole on the aircraft body structure. Finally, the calibration block, the fixed base and the φ13 hole of the aircraft body structure are coaxially fixed. The X-axis slide is connected to the fixed base by four M5 nuts and four M5 bolts. The slide is mainly composed of a slide base, a stepper motor, a lead screw and a slider, as shown in the attached Figure 5As shown, the stepper motor, lead screw and slider are installed on the slide base. The stepper motor adopts 28 series two-phase four-wire high-precision motor, which is controlled by the drive module and can drive the lead screw to rotate. The lead screw rotates and the slider translates, thereby realizing the movement of the slide. The movement range of the X-axis slide is 100mm. The L-shaped support is connected to the slider on the X-axis slide through four M4 screws. The movement of the slider in the X-axis slide can drive the Z-axis slide and the Y-axis slide to move as a whole. Similarly, the Y-axis slide is fixedly installed on the slider of the Z-axis slide by four M4 screws. The Z-axis slide can move in the Z-axis direction under the drive of the stepper motor, and drive the Y-axis slide to move as a whole. Finally, the Y-axis slide can translate in the Y-axis direction under the drive of the stepper motor, thus realizing the function of the three-axis slide module. The U-shaped bracket is connected to the slider of the Y-axis slide by four M4 screws. The connecting piece is fixed by two M4 screws and the U-shaped bracket. There is a φ8 round hole on the connecting piece. The displacement sensor is placed on the U-shaped bracket. At the same time, the displacement sensor passes through the φ8 round hole of the connecting piece. The other end of the displacement sensor is fixed to the connecting piece by a φ8 sensor nut. Therefore, the displacement sensor can translate with the Y-axis slide.

[0010] The displacement sensor uses a high-precision magnetic induction displacement sensor with a measurement accuracy of up to 0.01mm. The displacement sensor can be driven to achieve spatial positioning through the three-axis servo slide module. The sensor has a built-in reset spring, and the head can be automatically retracted. The sensor head touches the surface of the part for measurement. Due to the different convex and concave amounts on the surface of the part, the corresponding retraction value of the sensor is also different, so the electrical signal transmitted by the sensor is also different. This method can measure the flatness of the surface of the part and the step difference between the parts. The outer shell of the electric control box is made of ABS material and is made by 3D printing. It is used to install various electric control modules inside, including power modules, drive modules, and data processing modules. The power module can output 12V DC voltage and 5V DC voltage, which is used to power all electronic components, including the stepper motor, drive module, data processing module, displacement sensor, and display screen of the XYZ axis slide module. The stepper motor and drive module of the slide module require 12V DC voltage, and the data processing module, displacement sensor, and display screen require 5V DC voltage. The data processing module uses the stm32 minimum system board, which has the characteristics of high performance and low power consumption. It is the core module in the electric control box and can communicate data with the drive module, displacement sensor, and display screen at the same time. According to the characteristics of the body structure and the corresponding programming, the data processing module transmits the corresponding instructions to the drive module according to the set fixed measurement route. The drive module drives and controls the X, Y, and Z three-axis slides according to the instructions, and can control the rotation direction and rotation step angle of the three slide stepper motors, and finally realize the spatial positioning of the displacement sensor and the measurement of the surface of the part. The display screen uses a small OLED LCD screen, which can display the flatness value, step difference value, and part distance of the part through program control. The power switch uses a metal self-locking reset switch, which is installed on the upper part of the electric control box to control the execution and shutdown of the entire measuring device. The reset button is used for the zeroing operation of the three-axis slide of the measuring device. Before each measurement or when re-measurement is required, by pressing the reset button, it will be reset and measured again according to the fixed measurement route. If the reset button is pressed twice in succession, the two modes of measuring part flatness and step difference between parts can be switched. Each mode corresponds to a different fixed measurement route, which is jointly implemented by the data processing module and the drive module.

[0011] The method of using the intelligent detection device for finishing of large aircraft parts is as follows:

[0012] Step 1: Before measuring, the operator shall first clean the surface of the machine structure, clean the metal chips and impurities in the positioning holes, ensure that the measurement process does not damage the parts, ensure that the measurement conditions meet the requirements, and the inspector shall check whether the measuring device circuit is intact and operate according to the operating procedure manual.

[0013] Step 2: After completing the preparation work, the inspector places the fixed base and calibration block on the body structure to be tested, determines the fine-machining docking area to be tested, connects it with two positioning bolts, two locking nuts and two positioning holes on the body structure, and tightens the locking nuts with tools. At this time, ensure the stability of the entire measuring device, and no slight shaking should occur to avoid measurement errors. At this time, the fixing preparation process of the measuring device before measurement is completed.

[0014] Step 3: Start measuring, turn on the power switch, the device is started, press the reset button, the measuring device starts the calibration work before measurement, according to the set code program, the data processing module sends instructions to the drive module, the drive module controls the X, Y, Z axis slide to achieve the spatial precise positioning of the three-axis slide module, drive the displacement sensor to the calibration block, make the head of the displacement sensor contact the surface of the calibration block, when the measuring head of the displacement sensor is compressed to a certain value, the slide module automatically stops moving, completing the zero calibration process, at this time the display screen shows "zeroing completed, select measurement mode".

[0015] Step 4: After zeroing and calibration, according to the program settings, the three-axis slide module drives the displacement sensor to start measuring the surface of the part. First, press the reset button. The current mode is to measure the flatness of the part. The three-axis slide module will drive the displacement sensor to the surface of the part to be measured, so that the sensor measuring head and the part are in contact, and move along a fixed trajectory. The measuring head of the displacement sensor slides on the surface of the part to be measured. The measured data values ​​will be recorded in real time during the process. After completing the measurement route, the flatness of the part surface is automatically calculated through the program formula, and the data results are displayed on the display, such as "flatness = 0.02mm". After the flatness measurement is completed, the three-axis slide module drives the displacement sensor back to the calibration block, repeats the process of step three, and re-zeroes and calibrates.

[0016] Step 5: When measuring the step difference between two parts, press the reset button twice in succession to switch from the part flatness measurement mode to the part step difference measurement mode. As in step 4, follow the fixed step difference measurement route set by the program. The three-axis slide module first drives the displacement sensor to the surface of "Part No. 1" and records the measurement value of "Part No. 1" through the sensor measuring head. Then, the three-axis slide module drives the displacement sensor to the surface of "Part No. 2" and records the measurement value of "Part No. 2". After the measurement is completed, the data processing module automatically calculates the step difference value and displays the data results on the display screen, such as "Step Difference".

[0017] =0.15mm”.

[0018] Step 6: After measuring the flatness of the parts and the step difference between the parts, the display will save the corresponding measurement data. The inspector will check and record the measurement results. If the finishing value of the next part needs to be measured, repeat the above steps 2, 3, 4, and 5. After all the measurements are completed, turn off the power switch, remove the positioning bolts and locking nuts, remove the fixed base and calibration block, and collect all the accessories of the measuring device to avoid leaving them on the aircraft.

[0019] Beneficial effects of the present invention:

[0020] The present invention adopts the method of installing a precision slide module and a high-precision displacement sensor on a small tooling to realize efficient and high-precision detection of the fine processing of large aircraft components. The precision slide module can realize the spatial positioning of the three axes of XYZ, and drive the displacement sensor to realize the movement of a fixed route. The displacement sensor adopts a high-precision magnetic induction displacement sensor with a measurement accuracy of up to 0.01mm, which meets the measurement accuracy requirements. The measurement is performed by touching the parts, and the surface flatness of the parts and the step difference between the parts can be measured.

[0021] During the product production process, inspectors use the above-mentioned intelligent measuring devices to improve product quality control in terms of measurement efficiency and accuracy, improve the measurement method, and realize the upgrade and transformation of digital detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an axonometric view of an intelligent detection device for finishing the docking of large aircraft parts;

[0023] Figure 2 This is the left view of the intelligent detection device for finishing the docking of large aircraft parts;

[0024] Figure 3 This is the main view of the intelligent detection device for the finishing of large aircraft parts;

[0025] Figure 4 It is a schematic diagram of each module in the electric control box;

[0026] Figure 5 This is the internal structure distribution diagram of the slide.

[0027] Among them, 1-fixed base, 2-positioning bolt, 3-locking nut, 4-X-axis slide, 5-M4 screw, 6-L-type support, 7-Z-axis slide, 8-Y-axis slide, 9-U-type bracket, 10-displacement sensor, 11-sensor nut, 12-connector, 13-power switch, 14-reset button, 15-electric control box, 16-display screen, 17-calibration block, 18-M5 nut, 19-M5 bolt, 20-power module, 21-drive module, 22-data processing module. DETAILED DESCRIPTION

[0028] Embodiment 1:

[0029] Intelligent detection device for finishing of large aircraft parts, such as the attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 and attached Figure 4 As shown, it includes a fixed base 1, a positioning bolt 2, a locking nut 3, an X-axis slide 4, an M4 screw 5, an L-shaped support 6, a Z-axis slide 7, a Y-axis slide 8, a U-shaped bracket 9, a displacement sensor 10, a sensor nut 11, a connector 12, a power switch 13, a reset button 14, an electric control box 15, a display screen 16, a calibration block 17, an M5 nut 18, an M5 bolt 19, a power module 20, a drive module 21 and a data processing module 22.

[0030] Among them, the fixed base 1, the positioning bolt 2, the locking nut 3, the M4 screw 5, the L-shaped support 6, the U-shaped bracket 9, the sensor nut 11, the connecting piece 12, the calibration block 17, the M5 nut 18, and the M5 bolt 19 constitute the structural part of the device, and the X-axis slide 4, the Z-axis slide 7, the Y-axis slide 8, the displacement sensor 10, the power switch 13, the reset button 14, the electric control box 15, the display screen 16, the power module 20, the drive module 21, and the data processing module 22 constitute the electronic control part of the device.

[0031] The fixed base 1 is made of alloy steel and is used to fix the overall measuring device. It has a compact structure and can be installed in a small area. It can be defined as a small tooling and is connected to the aircraft structure through two positioning bolts 2 and two locking nuts 3. The calibration block 17 is used for sensor calibration before the detection device is measured, and is also connected and fixed by the positioning bolts 2 and locking nuts 3. The positioning bolt 2 has an outer diameter of 13mm, and the locking nut 3 has an inner diameter of 13mm, which is matched with the φ13 hole on the aircraft body structure. Finally, the calibration block 17, the fixed base 1 and the φ13 hole of the aircraft body structure are coaxially fixed. The X-axis slide 4 is connected to the fixed base 1 by four M5 nuts 18 and four M5 bolts 19. The slide is mainly composed of a slide base, a stepper motor, a lead screw and a slider, as shown in the attached figure. Figure 5As shown, the stepper motor, lead screw and slider are installed on the slide base, wherein the stepper motor adopts a 28 series two-phase four-wire high-precision motor, which is controlled by the drive module 21 and can drive the lead screw to rotate. When the lead screw rotates, the slider will translate, thereby realizing the movement of the slide. The moving range of the X-axis slide 4 is 100mm. The L-shaped support 6 is connected to the slider on the X-axis slide 4 through four M4 screws 5. The movement of the slider in the X-axis slide 4 can drive the Z-axis slide 7 and the Y-axis slide 8 to move as a whole. Similarly, the Y-axis slide 8 is fixedly installed on the slider of the Z-axis slide 7 by four M4 screws 5. The Z-axis slide 7 can move in the Z-axis direction under the drive of the stepper motor, and at the same time drive the Y-axis slide 8 to move as a whole. Finally, the Y-axis slide 8 can translate in the Y-axis direction under the drive of the stepper motor, thus realizing the function of the three-axis slide module. The U-shaped bracket 9 is connected to the slider of the Y-axis slide 8 by four M4 screws 5. The connecting piece 12 is fixed by two M4 screws 5 and the U-shaped bracket 9. There is a φ8 circular hole on the connecting piece 12. The displacement sensor 10 is placed on the U-shaped bracket 9. At the same time, the displacement sensor 10 passes through the φ8 circular hole of the connecting piece 12, and the other end is fixed to the connecting piece 12 by a φ8 sensor nut 11. Therefore, the displacement sensor 10 can translate with the Y-axis slide 8.

[0032] The displacement sensor 10 adopts a high-precision magnetic induction displacement sensor, and the sensor measurement accuracy can reach 0.01mm. The displacement sensor 10 can be driven to achieve spatial positioning through the three-axis servo slide module. The sensor has a built-in reset spring, and the head can be automatically retracted. The sensor head touches the surface of the part for measurement. Due to the different convex and concave amounts of the part surface, the corresponding retracted values ​​of the sensor are also different, so the electrical signals transmitted by the sensor are also different. In this way, the flatness of the part surface and the step difference between the parts can be measured. The outer shell of the electric control box 15 is made of ABS material and is made by 3D printing. It is used to install various electric control modules inside, including a power module 20, a drive module 21, and a data processing module 22. The power module 20 can output 12V DC voltage and 5V DC voltage, which is used to power all electronic components, including the stepper motor, drive module 21, data processing module 22, displacement sensor 10, and display screen 16 of the XYZ axis slide module, wherein the stepper motor and drive module 21 of the slide module require 12V DC voltage, and the data processing module 22, displacement sensor 10 and display screen 16 require 5V DC voltage. The data processing module 22 uses the stm32 minimum system board, which has the characteristics of high performance and low power consumption. It is the core module in the electric control box 15 and can communicate data with the drive module 21, the displacement sensor 10, and the display screen 16 at the same time. According to the characteristics of the body structure and the corresponding programming, the data processing module 22 transmits the corresponding instructions to the drive module 21 according to the set fixed measurement route. The drive module 21 drives and controls the X, Y, and Z three-axis slides according to the instructions, and can control the rotation direction and rotation step angle of the three slide stepper motors, and finally realizes the spatial positioning of the displacement sensor 10 and the measurement of the surface of the part. The display screen 16 uses a small OLED liquid crystal screen, which can display the flatness value, step difference value and part distance of the part through program control. The power switch 13 uses a metal self-locking reset switch, which is installed on the upper part of the electric control box 15 and is used to control the execution and shutdown of the entire measuring device. The reset button 14 is used for the zeroing operation of the three-axis slide of the measuring device. Before each measurement or when re-measurement is required, by pressing the reset button 14, it will be reset and measured again according to the fixed measurement route. If the reset button 14 is pressed twice in succession, the switching between the two modes of measuring part flatness and inter-part step difference can be realized. Each mode corresponds to a different fixed measurement route, which is jointly realized by the data processing module 22 and the driving module 21.

[0033] Embodiment 2:

[0034] The method of using the intelligent detection device for finishing of large aircraft parts is as follows:

[0035] Step 1: Before measuring, the operator shall first clean the surface of the machine structure, clean the metal chips and impurities in the positioning holes, ensure that the measurement process does not damage the parts, ensure that the measurement conditions meet the requirements, and the inspector shall check whether the measuring device circuit is intact and operate according to the operating procedure manual.

[0036] Step 2: After completing the preparation work, the inspector places the fixed base 1 and the calibration block 17 on the body structure to be tested, determines the fine-machining docking area to be tested, connects them with two positioning bolts 2, two locking nuts 3 and two positioning holes on the body structure, and tightens the locking nuts 3 with tools. At this time, ensure the stability of the entire measuring device, and no slight shaking should occur to avoid measurement errors. At this time, the fixing preparation process of the measuring device before measurement is completed.

[0037] Step 3: Start measuring, turn on the power switch 13, the device is started, press the reset button 14, the measuring device starts the calibration work before measurement, according to the set code program, the data processing module 22 sends instructions to the drive module 21, the drive module 21 controls the X, Y, and Z axis slides to achieve precise spatial positioning of the three-axis slide module, and drives the displacement sensor 10 to the calibration block 17, so that the head of the displacement sensor 10 contacts the surface of the calibration block 17. When the measuring head of the displacement sensor 10 is compressed to a certain value, the slide module automatically stops moving, completing the zero calibration process. At this time, the display screen 16 displays the words "Zeroing completed, select measurement mode".

[0038] Step 4: After zeroing and calibration, according to the program settings, the three-axis slide module drives the displacement sensor 10 to start measuring the surface of the part. First, press the reset button 14. The current mode is to measure the flatness of the part. The three-axis slide module will drive the displacement sensor 10 to move to the surface of the part to be measured, so that the sensor measuring head and the part are in contact, and move along a fixed trajectory. The measuring head of the displacement sensor 10 performs sliding measurement on the surface of the part to be measured. The measured data values ​​in the process will be recorded in real time. After completing the measurement route, the flatness of the part surface is automatically calculated through the program formula, and the data results are displayed on the display screen 16, for example, "flatness = 0.02mm". After the flatness measurement is completed, the three-axis slide module drives the displacement sensor 10 back to the calibration block 17, repeats the process of step three, and re-zeroes and calibrates.

[0039] Step 5: When measuring the step difference between two parts, press the reset button 14 twice in succession to switch from the part flatness measurement mode to the part step difference measurement mode. As in step 4, according to the fixed step difference measurement route set by the program, the three-axis slide module first drives the displacement sensor 10 to the surface of "Part No. 1" and records the measurement value of "Part No. 1" through the sensor measuring head. Then, the displacement sensor 10 is driven to the surface of "Part No. 2" through the three-axis slide module, and the measurement value of "Part No. 2" is recorded. After the measurement is completed, the data processing module 22 automatically calculates the step difference value and displays the data result through the display screen 16, for example, "step difference = 0.15mm".

[0040] Step 6: After measuring the flatness of the parts and the step difference between the parts, the display screen 16 will save the corresponding measurement data. The inspector will view and record the measurement results. If the matching finishing value of the next part needs to be measured, repeat the process contents of the above steps 2, 3, 4 and 5. After all the measurements are completed, turn off the power switch 13, remove the positioning bolts 2 and the locking nuts 3, remove the fixed base 1 and the calibration block 17, and collect all the accessories of the measuring device to avoid leaving them on the aircraft.

Claims

1. Intelligent detection device for finishing of large aircraft parts, characterized by: It comprises a fixed base (1), an X-axis slide (4), an L-shaped support (6), a Z-axis slide (7), a Y-axis slide (8), a U-shaped bracket (9), a displacement sensor (10), a connecting piece (12), a power switch (13), a reset button (14), an electric control box (15), a display screen (16), a calibration block (17), a power module (20), a drive module (21) and a data processing module (22); The fixed base (1) is connected to the aircraft structure; the calibration block (17) is connected and fixed by a positioning bolt (2) and a locking nut (3); the positioning bolt (2) has an outer diameter of 13 mm, the locking nut (3) has an inner diameter of 13 mm, and is matched and connected with a φ13 hole on the aircraft body structure, and finally the calibration block (17), the fixed base (1) and the φ13 hole on the aircraft body structure are coaxially fixed; the X-axis slide (4) is connected to the fixed base (1) by four M5 nuts (18) and four M5 bolts (19), and the X-axis slide (4) is composed of a slide base, a stepper motor, a lead screw and a slider. The stepper motor adopts a 28 series two-phase four-wire high-precision motor, which is controlled by a drive module (21), and the moving range of the X-axis slide (4) is 100 mm; The L-shaped support (6) is connected to the slider on the X-axis slide (4), and the movement of the slider in the X-axis slide (4) can drive the Z-axis slide (7) and the Y-axis slide (8) to move as a whole; the Y-axis slide (8) is fixedly installed on the slider of the Z-axis slide (7) by four M4 screws (5); the U-shaped bracket (9) is connected to and fixed to the slider of the Y-axis slide (8) by four M4 screws (5), and the connecting piece (12) is fixed by two M4 screws (5) and the U-shaped bracket (9), and there is a φ8 circular hole on the connecting piece (12), and the displacement sensor (10) is placed on the U-shaped bracket (9), and the displacement sensor (10) passes through the φ8 circular hole of the connecting piece (12), and the other end is fixed to the connecting piece (12) by a φ8 sensor nut (11), so that the displacement sensor (10) can be translated along with the Y-axis slide (8); The electric control box (15) comprises a power module (20), a drive module (21), and a data processing module (22); The power module (20) can output a 12V DC voltage and a 5V DC voltage, and supplies power to a stepper motor, a drive module (21), a data processing module (22), a displacement sensor (10), and a display screen (16) of an XYZ-axis slide table module, wherein the stepper motor and the drive module (21) of the slide table module require a 12V DC voltage, and the data processing module (22), the displacement sensor (10), and the display screen (16) require a 5V DC voltage; the data processing module (22) is a core module in the electric control box (15), and can simultaneously communicate data with the drive module (21), the displacement sensor (10), and the display screen (16), and a program is written accordingly according to the characteristics of the machine body structure; The power switch (13) is a metal self-locking reset switch, which is installed on the upper part of the electric control box (15) and is used to control the execution and shutdown of the entire measuring device; the reset button (14) is used for the zeroing operation of the three-axis slide table of the measuring device.

2. The intelligent detection device for finishing of large aircraft parts according to claim 1, characterized in that: The fixed base (1) is made of alloy steel.

3. The intelligent detection device for finishing of large aircraft parts as claimed in claim 1 or 2, characterized in that: The displacement sensor (10) has a measurement accuracy of 0.01 mm, and can be driven by a three-axis servo slide module to achieve spatial positioning.

4. The intelligent detection device for finishing of large aircraft parts as claimed in claim 1 or 2, characterized in that: The outer shell of the electric control box (15) is made of ABS material and is manufactured by 3D printing.

5. The intelligent detection device for finishing of large aircraft parts as claimed in claim 3, characterized in that: The outer shell of the electric control box (15) is made of ABS material and is manufactured by 3D printing.

6. The intelligent detection device for finishing of large aircraft parts as claimed in claim 1, 2 or 5, characterized in that: The display screen (16) is a small OLED liquid crystal screen.

7. The intelligent detection device for finishing of large aircraft parts as claimed in claim 3, characterized in that: The display screen (16) is a small OLED liquid crystal screen.

8. The intelligent detection device for finishing of large aircraft parts as claimed in claim 4, characterized in that: The display screen (16) is a small OLED liquid crystal screen.

9. The method for using the intelligent detection device for finishing of large aircraft parts according to any one of claims 1 to 8, characterized in that: Here are the steps: Step 1: Before measuring, the operator should first clean the surface of the machine structure and the metal chips and impurities in the positioning holes; Step 2: After completing the preparation work, the inspector places the fixed base (1) and the calibration block (17) on the machine body structure to be tested, determines the fine-machining docking area to be tested, connects the two positioning bolts (2), two locking nuts (3) and two positioning holes on the machine body structure, and tightens the locking nuts (3) with a tool; Step 3: Start measuring, turn on the power switch (13), the device is started, press the reset button (14), the measuring device starts the calibration work before measurement, according to the set code program, the data processing module (22) sends instructions to the driving module (21), the driving module (21) controls the X, Y, and Z axis slides to achieve the spatial precision positioning of the three-axis slide module, drives the displacement sensor (10) to the calibration block (17), and makes the head of the displacement sensor (10) contact the surface of the calibration block (17). When the measuring head of the displacement sensor (10) is compressed to a certain value, the slide module automatically stops moving, and the zero calibration process is completed. At this time, the display screen (16) displays the words "zeroing completed, select measurement mode"; Step 4: After zeroing and calibration, according to the program settings, the three-axis slide module drives the displacement sensor (10) to start measuring the surface of the part; first, press the reset button (14), the current mode is to measure the flatness of the part, the three-axis slide module will drive the displacement sensor (10) to move to the surface of the part to be measured, so that the sensor measuring head and the part are in contact, and move according to a fixed trajectory. The measuring head of the displacement sensor (10) performs sliding measurement on the surface of the part to be measured. The measured data values ​​during the process will be recorded in real time. After completing the measurement route, the flatness of the part surface is automatically calculated by the program formula, and the data results are displayed on the display screen (16). After the flatness measurement is completed, the three-axis slide module drives the displacement sensor (10) back to the calibration block (17), and repeats the process of step 3 to re-zero calibration; Step 5: When measuring the step difference between two parts, the reset button (14) is pressed twice in succession to switch from the part flatness measurement mode to the part step difference measurement mode. According to the fixed step difference measurement route set by the program, the three-axis slide module first drives the displacement sensor (10) to the surface of "Part No. 1" and records the measurement value of "Part No. 1" through the sensor measuring head; then the displacement sensor (10) is driven to the surface of "Part No. 2" through the three-axis slide module and the measurement value of "Part No. 2" is recorded. After the measurement is completed, the data processing module (22) automatically calculates the step difference value and displays the data result through the display screen (16); Step 6: After completing the measurement of the part flatness and the step difference between parts, the display screen (16) will save the corresponding measurement data, and the inspection personnel will view and record the measurement results. If it is necessary to measure the matching finishing value of the next part, repeat the process contents of steps 2, 3, 4 and 5 above. After all measurements are completed, turn off the power switch (13), remove the positioning bolts (2) and the locking nuts (3), and remove the fixed base (1) and the calibration block (17).

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