Method for detecting the depth of a slot in a hermetic band of a hatch cover of an aircraft

Abstract

The present application relates to a kind of detection methods of aircraft hatch air-tight band groove depth, belong to the technical field of aircraft assembly detection.The present application can realize the high-precision high-efficiency measurement of groove depth, this method uses high-precision laser ranging sensor to realize depth measurement, the analog electric signal generated when sensor moves is transmitted to single-chip microcontroller processing, and is converted into corresponding displacement by program calculation, solve the problem of human measurement error.A kind of digital measurement device is designed, the device is made according to the shape characteristics of air-tight band groove, and the dynamic balance component of cooperation measurement is made, to ensure the stability of measurement, improve the measurement accuracy.Through the measurement method, the continuity of air-tight band groove depth can be realized, the specific depth value of each detection point can be displayed in real time during the whole measurement process, and the minimum depth value is recorded, so as to improve the detection efficiency.

Description

Technical Field

[0001] This invention relates to a method for detecting the depth of the airtight groove in an aircraft canopy, belonging to the field of aircraft assembly and inspection technology. Background Technology

[0002] The fighter jet cockpit is the pilot's control area, housing various functional systems. Among these, the environmental control system is a comprehensive device designed to ensure the appropriate environmental conditions within the aircraft cockpit and equipment bay for the normal operation of the crew and equipment. It functions to supply and distribute air to the cockpit, control cabin pressure, and regulate temperature and humidity. This system includes a cockpit pressurization system and an air conditioning system. The cockpit air supply system provides the air source for pressurization and air conditioning, ensuring the cabin pressure is higher than ambient air pressure while maintaining clean air. The air distribution system delivers temperature-controlled air into the cabin, achieving cooling, heating, and ventilation, thus maintaining suitable temperature and humidity conditions within the aircraft cockpit and providing the pilot with a comfortable flying environment. The proper functioning of this system depends on ensuring the cockpit's airtightness. The airtightness of the fighter jet cockpit is crucial for the pilot and other functional systems within the cockpit. If the airtightness does not meet standards, it can cause cabin depressurization at high altitudes, leading to malfunction of the environmental control system and endangering the pilot's life.

[0003] Ensuring the airtightness of the aircraft cockpit requires special manufacturing processes. During component assembly, in addition to applying sealant to the connections between the stringer and skin, frame and skin, skin overlaps, skin seams, and various fasteners, an airtight sealant strip is installed between the canopy and fuselage to seal the cockpit. After the canopy is closed, the seal is primarily achieved through compression between the airtight sealant and the fuselage. The airtight sealant is placed in a groove, and the depth of this groove is strictly controlled during production, meeting relevant design parameters. Otherwise, the sealant will fail to seal, leading to serious consequences. Currently, the depth of the airtight seal groove is primarily measured using a steel ruler or calipers. The operator uses the tool and visually observes and records the values. The cockpit airtight seal groove is an irregularly shaped part with allowance on both sides. After assembly, the groove depth must be no less than 15.00 mm. This value is a critical characteristic indicator, and this dimension must be guaranteed during actual processing and final inspection. Currently, due to the R-angle inside the airtight belt groove, it is not easy to ensure verticality using a steel ruler and vernier calipers, resulting in low measurement accuracy and significant influence from human factors. To complete the double-sided groove depth measurement, the operator needs to hold the tool and measure the depth at each position sequentially, which is very inefficient. At the same time, the minimum groove depth needs to be recorded throughout the measurement process, making it difficult to visually determine the location of the minimum depth, resulting in unsatisfactory measurement results. Summary of the Invention

[0004] To address the aforementioned problems, an intelligent detection method for the depth of the airtight seal groove in an aircraft canopy has been invented. This method enables high-precision and efficient measurement of the groove depth. It employs a high-precision laser rangefinder sensor for depth measurement, transmitting the analog electrical signal generated by the sensor's movement to a microcontroller for processing. The signal is then converted into a corresponding displacement value through program calculation, thus solving the problem of human measurement errors. Simultaneously, a digital measurement device is designed. This device incorporates dynamically balancing components tailored to the shape of the airtight seal groove, ensuring measurement stability and improving accuracy. Furthermore, this measurement method enables continuous measurement of the airtight seal groove depth. The entire measurement process displays the specific depth values ​​at each detection point in real time and records the minimum depth value, thereby improving detection efficiency.

[0005] The technical solution of the present invention is as follows:

[0006] A method for detecting the depth of the airtight groove in an aircraft canopy, comprising the following steps:

[0007] Step 1: Method for detecting the depth of airtight grooves

[0008] 1.1 Hardware System Setup and Software Design

[0009] The hardware system control module uses an Atmega328P microcontroller minimum system, and the power supply module uses a 3.7V rechargeable lithium battery, which converts the 3.7V DC voltage to 5.0V DC voltage via a boost module. The display screen uses a 1.3-inch OLED display module, and the display screen and control chip use the IIC communication protocol for data transmission. Through SDA and SCL dual-wire communication, multi-line data display can be achieved. The ranging device uses a high-precision laser ranging sensor with analog output, achieving a measurement accuracy of 0.01mm, meeting the requirements of on-site measurement. The microcontroller, laser sensor, and display screen are all powered by 5.0V DC. Figure 1 As shown.

[0010] The software uses the Arduino IDE software development platform. On the PC, the code is written in C language using a microcontroller. By calling the corresponding header files and library functions in Arduino Uno, the driver code for each electrical module is written. At the same time, the corresponding logic calculation program is designed according to the measurement requirements.

[0011] 1.2 Selection and Calibration of Laser Sensors

[0012] Based on the structural dimensions of the airtight groove, a laser rangefinder sensor with an appropriate range is selected for measurement. The distance from the laser emitter's end face to the bottom of the airtight groove is approximately 30mm. A sensor with a measurement range of 30±5mm is sufficient for distance measurement. The laser rangefinder sensor is connected to the AD acquisition port of the Atmega328P minimum system. Since the Atmega328P microcontroller has a built-in 10-bit analog-to-digital converter, the data read from the AD port is 2^10 = 1024. When the laser rangefinder sensor measures 25mm, the corresponding AD value is 0, and the corresponding analog voltage is 0V. When the laser rangefinder sensor measures 35mm, the corresponding AD value is 1024, and the corresponding analog voltage is 5V. Therefore, through the microcontroller's AD converter, the travel resolution is...

[0013] 10 / 1024 = 0.009765625mm, and the voltage resolution is 5 / 1024 = 0.0048828125V. For example, when there is a relative displacement between the emitting end face of the laser rangefinder and the bottom surface of the airtight groove, the microcontroller's AD port reads the real-time analog value of the sensor as X, and the actual measured distance of the laser sensor is 0.009765625*X+25mm.

[0014] 1.3 Calculation method for airtight groove depth

[0015] The depth of the airtight strip groove is calculated using the linear function formula Y = KX + B. The height difference between the sensor transmitting end face and the bottom surface of the sensor mounting bracket is H1, and the height difference between the upper end face of the support roller and the bottom surface of the U-shaped support is H2. The resolution of the analog-to-digital converter is K = 10 / 1024 = 0.009765625. The bottom surface of the U-shaped support and the bottom surface of the sensor mounting bracket are on the same plane. During measurement, the distance between the sensor transmitting end face and the bottom surface of the groove changes according to the change in the depth of the airtight strip groove. The AD port reads the real-time analog value X. Figure 2 As shown, the depth of the airtight belt groove can be calculated, and the measurement result should be retained to two decimal places. If the Y value is less than 15.00 mm, it proves that the depth of the airtight belt groove is unqualified. The specific formula for the depth of the airtight belt groove is as follows:

[0016] Y=[(0.009765625*X+25)+H2]-H1

[0017] 1.4 Record minimum depth

[0018] According to the process requirements, the minimum depth of the airtight belt groove needs to be recorded during the measurement process. By programming the code, the comparison function minx,y in Arduino is used to take the minimum value of the sensor detection data in real time. The minimum depth value is reflected on the display screen in real time through the touch switch. The minimum depth value can also be recorded. The record of the current depth extreme value will be retained until the next data update. Therefore, the operator can clearly identify the specific measurement value of each position of the airtight belt groove.

[0019] Step 2: Design an airtight groove depth measuring device

[0020] Based on the shape characteristics of the airtight belt groove, a dynamic balancing component for measurement is designed to provide stable support for the laser rangefinder sensor, which helps to ensure accurate sensor data detection and facilitates measurement by operators. The device uses a limiting mechanism and a clamping mechanism to achieve dual stable positioning, so that the airtight belt groove and the measuring device are closely fitted, which is conducive to the stable emission and reception of the laser sensor. By applying this intelligent detection device, the groove depth of the airtight belt groove can be accurately calculated, improving the current measurement method and increasing measurement accuracy and efficiency.

[0021] The aircraft canopy airtight groove depth measuring device comprises a U-shaped support, a limit block, an M3 fixing bolt, a spring, a clamping stud, a clamping plate, a bushing, a limit nut, a bearing, a fixing nut, a laser rangefinder sensor, an M3 screw, a sensor bracket, a support roller bolt, a sensor connection terminal, a display screen, a recording button, a reset button, a power switch, a control box, a power module, a boost module, and a control module.

[0022] As attached Figure 3 Appendix Figure 4 and attached Figure 5 As shown, the structural parts of the measuring device consist of a U-shaped support, a limiting block, an M3 fixing bolt, a spring, a clamping stud, a clamping plate, a bushing, a limiting nut, a bearing, a fixing nut, an M3 screw, a sensor bracket, and a supporting roller bolt. The electrical control part of the measuring device consists of a laser rangefinder, a sensor connection terminal, a display screen, a recording key, a reset key, a power switch, a control box, a power module, a boost module, and a control module.

[0023] The U-shaped support is the main supporting component of the measuring device, and it is equipped with four... The room has a through hole, into which four bearings with an outer diameter of 6mm and an inner diameter of 3mm are embedded. Two limiting blocks are installed internally, connected by four M3 fixing bolts. Each limiting block has two... A through hole is used to simultaneously pass two M3 support roller bolts through the bearing and the inner hole of the limiting block. The other end is secured with a fixing nut. The distance between the two limiting blocks is designed to be 5mm, used for limiting and fixing the sidewall of the 5mm thick airtight groove. The clamping mechanism consists of a spring, clamping studs, clamping plates, a bushing, and a limiting nut. Figure 6As shown, four 3mm inner diameter bushings are installed on the upper part of the U-shaped support. Four M3 clamping studs pass through the bushings. Both ends of the bushings are threaded; one end is locked and limited by a limit nut, and the other end is connected to a clamping plate. A spring is inserted between the inner wall of the U-shaped support and the clamping plate. When the airtight tape groove is inserted, the lower end face of the side wall of the airtight tape groove contacts the two M3 support roller bolts. While being limited by two limit blocks, the four clamping plates of the clamping mechanism achieve bidirectional clamping of the side wall of the airtight tape groove, preventing the measuring device from deflecting and affecting the accuracy of the measurement. The sensor bracket is fixed to the U-shaped support with M3 screws. The lower end faces of the sensor bracket and the U-shaped support are designed to be on the same plane to realize the above calculation method of Y = -H1.

[0024] The laser rangefinder sensor is fixed to the sensor bracket with two M3 screws. Based on the dimensions of the airtight groove, the rangefinder sensor is selected with a measuring range of 30±5mm. The control box houses the various electronic components. One end of the sensor connection terminal connects to the laser rangefinder sensor via a cable, and the other end connects to the control module. The control module receives signals, processes data, and outputs command information. The laser rangefinder sensor transmits real-time acquired data to the control module for calculation and processing, and displays the measurement data on the screen. The power switch is installed at the opening in the control box, serving as the main switch for the measuring device. The reset button is used to reset the software program. If the measurement is interrupted or the measurement data is inaccurate due to external factors, the measurement can be restarted by pressing the reset button, which is convenient and quick. The record button is a touch-sensitive button, mainly used to record the minimum value of the airtight groove depth. Through program logic design, when the operator needs to record the minimum value of a certain point, simply touch the record button, and the minimum value will be reflected on the display screen. Depending on the actual measurement requirements, if the operator does not touch the record button again, the display screen will retain the current extreme value record. The power module uses a 3.7V lithium battery, which can be repeatedly charged. Through a boost module, the 3.7V DC voltage is boosted to 5.0V to power the control module, display screen and laser rangefinder simultaneously.

[0025] A method for detecting the depth of the airtight groove in an aircraft canopy, comprising the following steps:

[0026] Step 1: Prepare for measurement by checking whether the limiting and clamping mechanisms of the measuring device meet the measurement requirements. Operators must be qualified to use the measuring device. At the same time, ensure that the inside and surface of the entire airtight belt groove are clean and free of metal shavings, excess paint, etc.

[0027] Step 2: The operator holds the measuring device and selects any position in the airtight belt groove. The outer wall is inserted into the measuring device so that the lower end face of the side wall of the airtight belt groove contacts the two M3 support roller bolts. Then, the side wall of the airtight belt groove is stably positioned by the limiting block in the limiting mechanism of the measuring device and the clamping plate in the clamping mechanism to prevent the measuring device from tilting and affecting the measurement accuracy.

[0028] Step 3: Turn on the power switch of the control box, start the electronic control system, press the reset button to refresh the data. At this time, the display screen shows the groove depth at the current position. Hold the measuring device and move it slowly along the measurement movement direction. The lower end face of the side wall of the airtight belt groove will cause the support roller bolt to roll. Due to the continuous change of the groove depth, the measurement data of the laser range sensor will also change continuously.

[0029] Step 4: According to the measurement requirements, if the display shows that the depth of the airtight strip groove at a certain location is less than 15.00mm, it proves that the groove depth at that location is unqualified. The display will turn red to give an alarm reminder, and the groove depth value at the unqualified location will be recorded at the same time.

[0030] Step 5: During the measurement process, if it is necessary to record the minimum groove depth at a certain location, the operator can record the minimum groove depth on the display screen by touching the record button. If it is necessary to record the groove depth at other locations, the operator can touch the record button again, and the display screen will record the minimum value at the current location. The software comparison function min will then compare all the minimum values ​​and finally record the minimum groove depth.

[0031] Step 6: After completing the measurement of the outer wall of the airtight belt groove, measure the groove depth of the inner wall of the airtight belt groove in the same way.

[0032] Step 7: After the double-sided trench depth measurement is completed, the operator records the data on the display screen according to the relevant requirements, turns off the power switch, and the measurement is complete.

[0033] The beneficial effects of this invention are:

[0034] By applying this intelligent detection method, the traditional detection method has been upgraded to an intelligent detection technology, which improves the efficiency and accuracy of airtight groove depth measurement, solves product control issues, and avoids huge economic losses caused by rework and repair of subsequent products. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the circuit connecting the controller and the module;

[0036] Figure 2 This is a schematic diagram for calculating the depth of the airtight groove;

[0037] Figure 3 This is an isometric schematic diagram of the airtight groove depth measuring device;

[0038] Figure 4 This is a schematic diagram of the control box for the airtight groove depth measuring device;

[0039] Figure 5 This is a diagram showing the internal layout of the control box for the airtight groove depth measuring device.

[0040] Figure 6 This is a front view of the air-tight groove depth measuring device;

[0041] Figure 7 This is a schematic diagram of the application of an airtight groove depth measuring device. Figure 1 ;

[0042] Figure 8 This is a schematic diagram of the application of an airtight groove depth measuring device. Figure 2 .

[0043] Among them, 1-U-shaped support, 2-limiting block, 3-M3 fixing bolt, 4-spring, 5-clamping stud, 6-clamping plate, 7-shaft sleeve, 8-limiting nut, 9-bearing, 10-fixing nut, 11-laser rangefinder sensor, 12-M3 screw, 13-sensor bracket, 14-supporting roller bolt, 15-sensor connection terminal, 16-display screen, 17-record button, 18-reset button, 19-power switch, 20-control box, 21-power module, 22-boost module, 23-control module. Detailed Implementation

[0044] Example 1:

[0045] The aircraft canopy airtight groove depth measuring device comprises a U-shaped support 1, a limiting block 2, an M3 fixing bolt 3, a spring 4, a clamping stud 5, a clamping plate 6, a bushing 7, a limiting nut 8, a bearing 9, a fixing nut 10, a laser rangefinder sensor 11, an M3 screw 12, a sensor bracket 13, a support roller bolt 14, a sensor connection terminal 15, a display screen 16, a recording button 17, a reset button 18, a power switch 19, a control box 20, a power module 21, a boost module 22, and a control module 23.

[0046] As attached Figure 3 Appendix Figure 4 and attached Figure 5 As shown, the structural parts of the measuring device consist of U-shaped support 1, limit block 2, M3 fixing bolt 3, spring 4, clamping stud 5, clamping plate 6, bushing 7, limit nut 8, bearing 9, fixing nut 10, M3 screw 12, sensor bracket 13, and supporting roller bolt 14. The electrical control part of the measuring device consists of laser range sensor 11, sensor connection terminal 15, display screen 16, recording key 17, reset button 18, power switch 19, control box 20, power module 21, boost module 22, and control module 23.

[0047] U-shaped support 1 is the main supporting component of the measuring device, and it is equipped with four... The room has a through hole, into which four bearings 9, each with an outer diameter of 6mm and an inner diameter of 3mm, are embedded. Two limiting blocks 2 are installed internally, connected by four M3 fixing bolts 3. Each limiting block 2 has two... A through hole is provided, through which two M3 support roller bolts 14 pass simultaneously through the bearing 9 and the inner hole of the limiting block 2. The other end is secured with a fixing nut 10. The distance between the two limiting blocks 2 is designed to be 5mm, used for limiting and fixing the sidewall of the 5mm thick airtight belt groove. The clamping mechanism consists of a spring 4, clamping studs 5, clamping plates 6, bushings 7, and limiting nuts 8. Figure 6 As shown, four bushings 7 with an inner diameter of 3mm are installed on the upper part of the U-shaped support 1. Four M3 clamping studs 5 pass through the bushings 7. Both ends of the bushings 7 are threaded. One end is locked and limited by a limit nut 8, and the other end is connected to a clamping plate 6. A spring 4 is inserted between the inner wall of the U-shaped support 1 and the clamping plate 6. When the airtight tape groove is inserted, the lower end face of the side wall of the airtight tape groove contacts the two M3 support roller bolts 14. While being limited by two limit blocks 2, the four clamping plates 6 of the clamping mechanism achieve bidirectional clamping of the side wall of the airtight tape groove, preventing the measuring device from deflecting and affecting the accuracy of the measurement. The sensor bracket 13 is fixed to the U-shaped support 1 by M3 screws 12. The lower end face of the sensor bracket 13 and the U-shaped support 1 are designed to be on the same plane to realize the above calculation method of Y=(0.009765625*X+25)+H2-H1.

[0048] The laser rangefinder 11 is fixed to the sensor bracket 13 by two M3 screws 12. Based on the dimensions of the airtight groove, the rangefinder 11 is selected to have a measuring range of 30±5mm. The control box 20 is used to install various electronic components. One end of the sensor connection terminal 15 is connected to the laser rangefinder 11 via a cable, and the other end is connected to the control module 23. The control module 23 is used to receive signals, process data, and output command information. The laser rangefinder 11 transmits real-time acquired data to the control module 23 for data calculation and processing, and displays the measurement data on the display screen 16. The power switch 19 is installed at the opening in the control box 20, serving as the main switch for the measuring device. The reset button 18 is used to reset the software program. If the measurement is interrupted or the measurement data is inaccurate due to external factors, the measurement can be restarted by pressing the reset button 18, which is convenient and quick. The recording key 17 is a touch-sensitive button, mainly used to record the minimum value of the airtight strip groove depth. Through program logic design, when the operator needs to record the minimum value of a certain point, they only need to touch the recording key 17, and the minimum value will be reflected on the display screen 16. According to the actual measurement requirements, if the operator does not touch the recording key 17 again, the display screen 16 will keep the current extreme value record. The power module 21 uses a 3.7V lithium battery, which can be repeatedly charged. Through the boost module 22, the 3.7V DC voltage is boosted to 5.0V to power the control module 23, the display screen 16, and the laser rangefinder sensor 11 simultaneously.

[0049] Example 2:

[0050] A method for detecting the depth of the airtight groove in an aircraft canopy, comprising the following steps:

[0051] Step 1: Prepare for measurement by checking whether the limiting and clamping mechanisms of the measuring device meet the measurement requirements. Operators must be qualified to use the measuring device. At the same time, ensure that the inside and surface of the entire airtight belt groove are clean and free of metal shavings, excess paint, etc.

[0052] Step 2: The operator holds the measuring device and selects any position in the airtight belt groove. The outer wall is inserted into the measuring device so that the lower end face of the side wall of the airtight belt groove contacts the two M3 support roller bolts 14. Then, the side wall of the airtight belt groove is stably positioned by the limiting block 2 in the limiting mechanism of the measuring device and the clamping plate 6 in the clamping mechanism to prevent the measuring device from tilting and affecting the measurement accuracy.

[0053] Step 3: Turn on the power switch 19 of the control box to start the electronic control system, press the reset button 18 to refresh the data. At this time, the display screen 16 displays the groove depth at the current position. Hold the measuring device and move it slowly along the measurement movement direction. The lower end face of the side wall of the airtight belt groove drives the support roller bolt 14 to roll. Due to the continuous change of the groove depth, the measurement data of the laser range sensor 11 also changes continuously.

[0054] Step 4: According to the measurement requirements, if the display screen 16 shows that the depth of the airtight strip groove at a certain location is less than 15.00mm, it proves that the groove depth at that location is unqualified. The display screen will turn red to give an alarm reminder, and the groove depth value at the unqualified location will be recorded at the same time.

[0055] Step 5: During the measurement process, if it is necessary to record the minimum groove depth at a certain location, the operator can record the minimum groove depth on the display screen 16 by touching the record button 17. If it is necessary to record the groove depth at other locations, the operator can touch the record button 17 again, and the display screen 16 will record the minimum value at the current location. All minimum values ​​are compared again by the software comparison function minx,y, and finally the minimum groove depth is recorded.

[0056] Step 6: After completing the measurement of the outer wall of the airtight belt groove, measure the groove depth of the inner wall of the airtight belt groove in the same way.

[0057] Step 7: After the double-sided trench depth measurement is completed, the operator records the data on the display screen 16 according to the relevant requirements, turns off the power switch 19, and the measurement is completed.

Claims

1. A device for measuring the depth of the airtight groove in an aircraft canopy, characterized in that, Includes a U-shaped support (1), a limiting block (2), an M3 fixing bolt (3), a spring (4), a clamping stud (5), a clamping plate (6), a bushing (7), a limiting nut (8), a bearing (9), a fixing nut (10), a laser rangefinder sensor (11), an M3 screw (12), a sensor bracket (13), a support roller bolt (14), a sensor connection terminal (15), a display screen (16), a record button (17), a reset button (18), a power switch (19), a control box (20), a power module (21), a boost module (22), and a control module (23); The U-shaped support (1) has two limiting blocks (2) installed inside, which are connected by four M3 fixing bolts (3). The two limiting blocks (2) are respectively provided with two φ3 through holes. Two M3 support roller bolts (14) are passed through the bearing (9) and the inner hole of the limiting block (2) at the same time. The other end is fixed with a fixing nut (10) to fix the support roller bolts (14). The clamping mechanism consists of a spring (4), a clamping stud (5), a clamping plate (6), a bushing (7) and a limiting nut (8). The U-shaped support (1) is installed on the upper part of the U-shaped support (1). Install four bushings (7) with an inner diameter of 3mm. Four M3 clamping studs (5) pass through the bushings (7). The bushings (7) have threads at both ends. One end is locked and limited by a limit nut (8), and the other end is connected to a clamping plate (6). A spring (4) is inserted between the inner wall of the U-shaped support (1) and the clamping plate (6). The lower end face of the side wall of the airtight belt groove contacts two M3 support roller bolts (14). While being limited by two limit blocks (2), the side wall of the airtight belt groove is clamped bidirectionally by the four clamping plates (6) of the clamping mechanism. The sensor bracket (13) is fixed to the U-shaped support (1) by M3 screws (12). The lower end faces of the sensor bracket (13) and the U-shaped support (1) are on the same plane, thus achieving... The calculation method for Y = ((0.009765625*X+25)+H2)-H1; Where X represents the real-time analog value read by the AD port; Y represents the depth of the airtight groove; H1 represents the height difference between the sensor transmitting end face and the bottom surface of the sensor fixing bracket; H2 represents the height difference between the upper end face of the support roller and the bottom surface of the U-shaped support. The laser rangefinder (11) is fixed on the sensor bracket (13). The control box (20) is used to install various electronic components. One end of the sensor connection terminal (15) is connected to the laser rangefinder (11) via a cable, and the other end is connected to the control module (23). The laser rangefinder (11) transmits the real-time acquisition data to the control module (23) and displays the measurement data on the display screen (16). The power switch (19) is installed at the opening of the control box (20).

2. The aircraft canopy airtight groove depth measuring device as described in claim 1, characterized in that, The U-shaped support (1) is provided with four φ6 through holes, and four bearings (9) with an outer diameter of 6mm and an inner diameter of 3mm are embedded in the holes.

3. The aircraft canopy airtight groove depth measuring device as described in claim 1 or 2, characterized in that, The distance between the two limiting blocks (2) is 5mm, which is used to limit and fix the side wall of the airtight groove with a wall thickness of 5mm.

4. The aircraft canopy airtight groove depth measuring device as described in claim 1 or 2, characterized in that, The laser rangefinder (11) is selected with a range of 30±5mm.

5. The aircraft canopy airtight groove depth measuring device as described in claim 3, characterized in that, The laser rangefinder (11) is selected with a range of 30±5mm.

6. The aircraft canopy airtight groove depth measuring device as described in claim 1, 2, or 5, characterized in that, The power module (21) uses a 3.7V lithium battery, and the 3.7V DC voltage is boosted to 5.0V by the boost module (22) to power the control module (23), the display screen (16) and the laser range sensor (11) simultaneously.

7. The aircraft canopy airtight groove depth measuring device as described in claim 3, characterized in that, The power module (21) uses a 3.7V lithium battery, and the 3.7V DC voltage is boosted to 5.0V by the boost module (22) to power the control module (23), the display screen (16) and the laser range sensor (11) simultaneously.

8. The aircraft canopy airtight groove depth measuring device as described in claim 4, characterized in that, The power module (21) uses a 3.7V lithium battery, and the 3.7V DC voltage is boosted to 5.0V by the boost module (22) to power the control module (23), the display screen (16) and the laser range sensor (11) simultaneously.

9. The aircraft canopy airtight groove depth measuring device as described in claim 1, 2, or 5, characterized in that, The reset button (18) is used to reset the software program, and the record button (17) is a touch-sensitive button.

10. The detection method of the aircraft canopy airtight groove depth measuring device according to any one of claims 1 to 9, characterized in that, The steps are as follows: Step 1: Prepare for measurement by checking whether the limiting and clamping mechanisms of the measuring device meet the measurement requirements, ensuring that the operator is qualified to use the measuring device, and ensuring that the inside and surface of the entire airtight belt groove are clean and tidy. Step 2: The operator holds the measuring device and takes any position of the airtight belt groove. The outer side wall is inserted into the measuring device so that the lower end face of the side wall of the airtight belt groove contacts the two M3 support roller bolts (14). Then, the side wall of the airtight belt groove is stably positioned by the limiting block (2) in the limiting mechanism of the measuring device and the clamping plate (6) in the clamping mechanism to prevent the measuring device from tilting and affecting the measurement accuracy. Step 3: Turn on the power switch (19) of the control box, start the electronic control system, press the reset button (18) to refresh the data. At this time, the display screen (16) displays the groove depth at the current position. Hold the measuring device and move it slowly along the measurement movement direction. The lower end face of the side wall of the airtight belt groove drives the support roller bolt (14) to roll. Due to the continuous change of the groove depth, the measurement data of the laser range sensor (11) also changes continuously. Step 4: According to the measurement requirements, if the display screen (16) shows that the depth of the airtight strip groove at a certain location is less than 15.00mm, it proves that the groove depth at that location is unqualified. The display screen will turn red to give an alarm reminder, and the groove depth value at the unqualified location will be recorded at the same time. Step 5: During the measurement process, if it is necessary to record the minimum value of the groove depth at a certain position, the operator can record the minimum value of the groove depth on the display screen (16) by touching the record key (17). If it is necessary to record the groove depth at other positions, the operator can touch the record key (17) again, and the display screen (16) will record the minimum value at the current position. All minimum values ​​are compared again by the software comparison function min(x,y), and finally the minimum value of the groove depth is recorded. Step 6: After completing the measurement of the outer wall of the airtight belt groove, measure the groove depth of the inner wall of the airtight belt groove in the same way. Step 7: After the double-sided trench depth measurement is completed, the operator records the data on the display screen (16) according to the relevant requirements, turns off the power switch (19), and the measurement is completed.

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