Aircraft hatch cover airtight belt groove depth detection method

Abstract

The invention relates to a method for detecting the depth of an airtight belt groove of an aircraft hatch cover, and belongs to the technical field of aircraft assembly detection. According to the method, high-precision and high-efficiency measurement of the groove depth can be realized, depth measurement is realized by adopting a high-precision laser distance measuring sensor, an analog electric signal generated when the sensor moves is transmitted to a single chip microcomputer for processing and is converted into corresponding displacement through program calculation, and the problem of manual measurement error is solved. Meanwhile, a digital measuring device is designed, according to the appearance characteristics of the airtight belt groove, a dynamic balance component matched with measurement is manufactured, the measuring stability is guaranteed, and the measuring precision is improved. Meanwhile, continuous measurement of the depth of the airtight belt groove can be achieved through the measurement method, the specific depth value of each detection point can be displayed in real time in the whole measurement process, the minimum depth value is recorded, and the detection efficiency is improved.

Description

Technical Field

[0001] The invention relates to a method for detecting the depth of an airtight belt groove of an aircraft cabin cover, and belongs to the technical field of aircraft assembly detection. Background Art

[0002] The cockpit of a fighter is the pilot's control area, and various functional systems are installed inside. Among them, the environmental control system is a complete set of devices to ensure that the aircraft cockpit and equipment compartment have appropriate environmental conditions required for the normal operation of the occupants and equipment. It can play the role of cockpit air supply and air distribution, control cabin pressure, and control temperature and humidity. This system includes a cabin pressurization system and an air conditioning system. The cabin air supply system is the air source for cabin pressurization and air conditioning, which can ensure that the cabin pressure is higher than the atmospheric pressure, and at the same time keep the air in the cabin clean. The air distribution system flows the temperature-controlled air into the cabin to achieve the effects of cooling or heating and ventilation, thereby ensuring that the temperature and humidity conditions in the aircraft cabin are appropriate and providing a good driving environment for the pilot. The system can function normally only if the airtightness of the cockpit must be guaranteed. The airtightness of the fighter cockpit is crucial to the pilots and other functional systems in the cabin. If the airtightness does not meet the standard requirements, it will cause the cabin to lose pressure at high altitude, causing the environmental control system to malfunction, and endangering the life safety of the pilot.

[0003] To ensure the airtightness of the aircraft cabin, special process methods need to be adopted in the aircraft manufacturing process. In the assembly of components, in addition to applying sealant to the connection parts between the long stringer and the skin, the connection parts between the frame and the skin, the overlap parts of the skin, the seam parts of the skin and various fasteners, it is also necessary to place an airtight tape between the cabin cover and the fuselage to seal the cabin. After the aircraft cabin cover is closed, it is mainly squeezed and sealed with the airtight tape and the fuselage. The airtight tape is placed in the airtight tape groove. During the product production process, there are strict control requirements for the depth processing of the airtight tape groove, which must meet the relevant design parameters, otherwise the airtight tape cannot achieve the sealing function, which will cause serious consequences. At present, the depth of the airtight tape groove is mainly measured by two tools, steel ruler or vernier caliper. The operator holds the tool and records the value in combination with visual observation. The cabin airtight tape groove is an irregular groove part with margins on both sides of the groove. After repair, the depth of the groove is required to be not less than 15.00mm. The value is a key characteristic indicator. This size must be guaranteed during actual processing and final inspection. At present, due to the R angle in the airtight belt groove, it is not easy to ensure verticality with steel ruler and vernier caliper, the measurement accuracy is not high, and it is greatly affected by human factors. To complete the bilateral groove depth measurement, the operator needs to hold the tool to measure the depth of each position in turn, which is very inefficient. At the same time, the minimum value of the groove depth needs to be recorded during the entire measurement process. Therefore, it is difficult to visually determine the position of the minimum depth, and the measurement effect is not ideal. Summary of the invention

[0004] In order to solve the above problems, an intelligent detection method for the depth of the airtight belt groove of an aircraft cabin cover is invented, which can realize high-precision and efficient measurement of the groove depth. This method uses a high-precision laser ranging sensor to realize depth measurement, transmits the analog electrical signal generated when the sensor moves to the single-chip microcomputer for processing, and converts it into the corresponding displacement through program calculation, thus solving the problem of human measurement error. At the same time, a digital measuring device is designed. According to the appearance characteristics of the airtight belt groove, a dynamic balance component is made to cooperate with the measurement to ensure the measurement stability and improve the measurement accuracy. At the same time, this measurement method can realize the continuous measurement of the depth of the airtight belt groove. The specific depth value of each detection point can be displayed in real time during the entire measurement process, and the minimum depth value can be recorded, thereby improving the detection efficiency.

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

[0006] A method for detecting the depth of an airtight belt groove of an aircraft cabin cover, comprising the following steps:

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

[0008] 1.1 Hardware system construction and software design

[0009] The hardware system control module uses the Atmega328P microcontroller minimum system, and the power module uses a 3.7V rechargeable lithium battery. The boost module converts the 3.7V DC voltage into a 5.0V DC voltage. The display screen uses a 1.3-inch OLED display module. The display screen and the control chip use the IIC communication protocol for data transmission. Through the SDA and SCL two-wire communication methods, the drive display of multiple lines of data can be realized. The distance measurement equipment uses a high-precision laser distance measurement sensor with analog output. The measurement accuracy can reach 0.01mm, which meets the requirements of on-site measurement. The microcontroller, laser sensor and display screen are all powered by DC 5.0V. Figure 1 shown.

[0010] The software adopts the Arduino IDE software development platform. The code is written in the C language of the microcontroller on the PC side. The driver code of each electrical module is written by calling the corresponding header files and library functions in Arduino uno. At the same time, the corresponding logical calculation program is designed according to the measurement requirements.

[0011] 1.2 Selection and calibration of laser sensors

[0012] According to the structural dimensions of the airtight belt groove, a laser distance sensor with a corresponding range is selected for measurement. The laser emission end face is about 30mm away from the bottom surface of the airtight belt groove. Selecting a sensor with a measurement range of 30±5mm can achieve distance measurement. Connect the laser distance sensor 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 distance value of the laser distance sensor is 25mm, the corresponding AD value is 0, and the corresponding analog voltage is 0V. When the distance value of the laser distance sensor is 35mm, the corresponding AD value is 1024, and the corresponding analog voltage is 5V. Therefore, through the AD analog-to-digital converter of the microcontroller, the travel resolution is

[0013] 10 / 1024=0.009765625mm, the voltage resolution is 5 / 1024=0.0048828125v. For example, when there is a relative displacement between the emitting end face of the laser ranging sensor and the bottom face of the airtight belt groove, the real-time analog value of the sensor read by the AD port of the single-chip microcomputer is X, and the actual measurement distance of the laser sensor is 0.009765625*X+25mm.

[0014] 1.3 Calculation method of airtight belt groove depth

[0015] The linear function formula Y=KX+B is used to calculate the depth of the airtight belt groove. The height difference between the sensor transmitting end face and the bottom surface of the sensor fixing bracket is H1, 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 K=10 / 1024=0.009765625, the bottom surface of the U-shaped support and the bottom surface of the sensor fixing bracket are on the same plane, and 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 belt groove during measurement. The real-time analog value read by the AD port is X, such as Figure 2 As shown, the depth of the airtight belt groove can be calculated, and the measurement result is retained to two decimal places. If the Y value is less than 15.00mm, it proves that the depth of the airtight belt groove is unqualified. The formula for the depth of the airtight belt groove is as follows:

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

[0017] 1.4 Recording Depth Minimum

[0018] According to the process requirements, the minimum depth of the airtight belt groove needs to be recorded during the measurement process. By compiling the program code, the comparison function minx, y in Arduino is used to obtain 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, and the minimum depth value can realize the recording function. The record of the current depth extreme value will be retained until the next data update, so the operator can clearly judge the specific measurement value of each position of the airtight belt groove.

[0019] Step 2: Design a device to measure the depth of the airtight belt groove

[0020] According to the appearance characteristics of the airtight belt groove, a dynamic balancing component is designed to cooperate with the measurement, which can provide stable support for the laser ranging sensor, help the sensor detect data accurately, and facilitate the operator to measure. The device adopts a limit mechanism and a clamping mechanism to achieve double stable positioning, so that the airtight belt groove and the measuring device can be 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, the current measurement method can be improved, and the measurement accuracy and efficiency can be improved.

[0021] An aircraft cabin cover airtight groove depth measuring device includes 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 ranging sensor, an M3 screw, a sensor bracket, a supporting roller bolt, a sensor connection terminal, a display screen, a record 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 , Attachment Figure 4 and attached Figure 5 As shown, the U-shaped support, limit block, M3 fixing bolt, spring, clamping stud, clamping plate, bushing, limit nut, bearing, fixing nut, M3 screw, sensor bracket, and supporting roller bolt constitute the structural part of the measuring device, and the laser ranging sensor, sensor connecting plug, display screen, record button, reset button, power switch, control box, power module, boost module, and control module constitute the electronic control part of the measuring device.

[0023] The U-shaped support is the main supporting member of the measuring device and is equipped with four Through hole, and four bearings with an outer diameter of 6mm and an inner diameter of 3mm are embedded in the hole. Two limit blocks are installed inside, connected by four M3 fixing bolts, and the two limit blocks are respectively provided with two Through the hole, pass two M3 support roller bolts through the inner hole of the bearing and the limit block at the same time, and fix the support roller bolts with a fixing nut at the other end. The distance between the two limit blocks is designed to be 5mm, which is used for the limit fixation of the side wall of the airtight groove with a wall thickness of 5mm. The clamping mechanism consists of a spring, a clamping stud, a clamping plate, a sleeve and a limit nut, such as Figure 6As shown, four shaft sleeves with an inner diameter of 3mm are installed on the upper part of the U-shaped support, and four M3 clamping studs pass through the shaft sleeves. The shaft sleeves have threads at both ends, 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 belt groove is inserted, the lower end surface of the side wall of the airtight belt groove contacts the two M3 supporting roller bolts. While limiting the position through two limit blocks, the four clamping plates of the clamping mechanism realize the bidirectional clamping of the side wall of the airtight belt groove, which limits the deflection of the measuring device and affects the accuracy of the measurement. The sensor bracket is fixed to the U-shaped support by M3 screws. The lower end surface of the sensor bracket and the U-shaped support are designed to be in the same plane to realize the above-mentioned calculation method of Y=-H1.

[0024] The laser distance sensor is fixed on the sensor bracket by two M3 screws. According to the outer dimensions of the airtight belt groove, the laser distance sensor selects a range of 30±5mm. The control box is used to install various electronic components. One end of the sensor connection terminal is connected to the laser distance sensor through a cable, and the other end is connected to the control module. The control module is used to receive signals, process data and output command information. The laser distance sensor transmits the real-time collected data to the control module, calculates and processes the data, and displays the measured data on the display screen. The power switch is installed at the opening of the control box as the main switch of the measuring device. The reset button is used to reset the software program. When the measurement is interrupted or the measurement data is inaccurate due to external factors, it can be re-measured by pressing the reset button, which is convenient and quick. The record button adopts a touch button, which is mainly used to record the minimum value of the depth of the airtight belt groove. Through the program logic design, when the operator needs to record the minimum value of a certain point, he only needs to touch the following record button, and the minimum value will be reflected on the display screen. According to the actual measurement requirements, if the operator no longer touches the record button, the display screen will always keep the current extreme value record. The power module uses a 3.7V lithium battery, which can be charged repeatedly. Through the boost module, the 3.7V DC voltage is increased to 5.0V, which is used to power the control module, display screen and laser ranging sensor at the same time.

[0025] A method for detecting the depth of an airtight belt groove of an aircraft cabin cover, comprising the following steps:

[0026] Step 1: Make preparations before measurement, check whether the limit mechanism and clamping mechanism of the measuring device meet the measurement requirements. The operator 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 tidy, without metal chips, excess paint, etc.;

[0027] Step 2: The operator holds the measuring device, takes any position of the airtight belt groove, and inserts the outer wall into the measuring device so that the lower end surface of the side wall of the airtight belt groove contacts the two M3 supporting roller bolts, and then the side wall of the airtight belt groove is firmly positioned by the limit block in the limit mechanism of the measuring device and the clamping piece in the clamping mechanism to prevent the measuring device from being deflected and affecting the measurement accuracy;

[0028] Step 3: Turn on the power switch of the control box, start the electronic control system, and press the reset button to refresh the data. At this time, the display screen shows the groove depth at the current position. Move the handheld measuring device slowly along the measuring direction. The lower end surface of the side wall of the airtight belt groove drives the supporting roller bolt to roll. Due to the continuous change of the groove depth, the measurement data of the laser ranging sensor also changes continuously.

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

[0030] Step 5: During the measurement process, if the minimum value of the groove depth at a certain position needs to be recorded, the operator can record the minimum value of the groove depth on the display screen by touching the record key. If the groove depth at other positions needs to be recorded, the operator touches the record key again, and the display screen will record the minimum value of the current position. All minimum values ​​will be compared again through the software comparison function min, and the minimum value of the groove depth will be finally recorded.

[0031] Step 6: After completing the measurement of the outer wall of the gas-tight belt groove, measure the groove depth of the inner wall of the gas-tight belt groove in the same way;

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

[0033] Beneficial effects of the present invention:

[0034] By applying this intelligent detection method, we have achieved an upgrade from traditional detection methods to intelligent detection technology, improved the efficiency and accuracy of airtight belt groove depth measurement, solved the product control capabilities, and avoided the huge economic losses caused by rework and repair of subsequent products. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is the schematic diagram of the circuit connection between the controller and the module;

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

[0037] Figure 3 It is a schematic diagram of the axial side of the gas-tight belt groove depth measuring device;

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

[0039] Figure 5 It is the distribution diagram inside the control box of the airtight belt groove depth measuring device;

[0040] Figure 6 is a front view of a gas-tight belt groove depth measuring device;

[0041] Figure 7 Application diagram of the gas-tight belt groove depth measuring device Figure 1 ;

[0042] Figure 8 Application diagram of the gas-tight belt groove depth measuring device Figure 2 .

[0043] Among them, 1-U-shaped support, 2-limit block, 3-M3 fixing bolt, 4-spring, 5-clamping stud, 6-clamping plate, 7-sleeve, 8-limiting nut, 9-bearing, 10-fixing nut, 11-laser ranging sensor, 12-M3 screw, 13-sensor bracket, 14-support 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 DESCRIPTION

[0044] Embodiment 1:

[0045] The invention discloses an airtight groove depth measuring device for an aircraft cabin cover, comprising a U-shaped support 1, a limit block 2, an M3 fixing bolt 3, a spring 4, a clamping stud 5, a clamping plate 6, a bushing 7, a limit nut 8, a bearing 9, a fixing nut 10, a laser ranging sensor 11, an M3 screw 12, a sensor bracket 13, a supporting roller bolt 14, a sensor connecting 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.

[0046] As attached Figure 3 , Attachment Figure 4 and attached Figure 5 As shown, the U-shaped support 1, the limit block 2, the M3 fixing bolt 3, the spring 4, the clamping stud 5, the clamping plate 6, the bushing 7, the limit nut 8, the bearing 9, the fixing nut 10, the M3 screw 12, the sensor bracket 13, and the supporting roller bolt 14 constitute the structural part of the measuring device, and the laser ranging sensor 11, the sensor connecting plug 15, the display screen 16, the record button 17, the reset button 18, the power switch 19, the control box 20, the power module 21, the boost module 22, and the control module 23 constitute the electronic control part of the measuring device.

[0047] The U-shaped support 1 is the main supporting member of the measuring device and is provided with four Through hole, and four bearings 9 with an outer diameter of 6mm and an inner diameter of 3mm are embedded in the hole. Two limit blocks 2 are installed inside, connected by four M3 fixing bolts 3, and the two limit blocks 2 are respectively provided with two Through the hole, two M3 support roller bolts 14 are passed through the inner hole of the bearing 9 and the limit block 2 at the same time, and the other end is fixed with a fixing nut 10 to support the roller bolt 14. The distance between the two limit blocks 2 is designed to be 5mm, which is used for the limit fixation of the airtight groove side wall with a wall thickness of 5mm. The clamping mechanism consists of a spring 4, a clamping stud 5, a clamping sheet 6, a sleeve 7 and a limit nut 8, as shown in FIG. Figure 6 As shown, four shaft sleeves 7 with an inner diameter of 3 mm are installed on the upper part of the U-shaped support 1, and four M3 clamping studs 5 pass through the shaft sleeves 7. The shaft sleeves 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. When the airtight belt groove is inserted, the lower end surface of the side wall of the airtight belt groove contacts the two M3 supporting roller bolts 14. While limiting the position through two limit blocks 2, the four clamping plates 6 of the clamping mechanism realize the bidirectional clamping of the side wall of the airtight belt groove, which limits the deflection of the measuring device and affects the accuracy of the measurement. The sensor bracket 13 is fixed to the U-shaped support 1 by M3 screws 12. The sensor bracket 13 and the lower end surface of the U-shaped support 1 are designed to be in the same plane, realizing the above-mentioned calculation method of Y=(0.009765625*X+25)+H2-H1.

[0048] The laser distance sensor 11 is fixed to the sensor bracket 13 by two M3 screws 12. According to the outer dimensions of the airtight belt groove, the laser distance sensor 11 selects a 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 distance sensor 11 through 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 distance sensor 11 transmits real-time collected data to the control module 23, calculates and processes the data, and displays the measured data through the display screen 16. The power switch 19 is installed at the opening of the control box 20 as the main switch of the measuring device. The reset button 18 is used to reset the software program. When the measurement is interrupted or the measurement data is inaccurate due to external factors, it can be re-measured by pressing the reset button 18, which is convenient and quick. The record key 17 is a touch-type key, which is mainly used to record the minimum value of the depth of the airtight belt groove. Through program logic design, when the operator needs to record the minimum value of a certain point, he only needs to touch the following record key 17, and the minimum value will be reflected on the display screen 16. According to the actual measurement requirements, if the operator no longer touches the record key 17, the display screen 16 will always keep the current extreme value record. The power module 21 uses a 3.7V lithium battery, which can realize the repeated charging function. Through the boost module 22, the 3.7V DC voltage is increased to 5.0V, which is used to power the control module 23, the display screen 16 and the laser ranging sensor 11 at the same time.

[0049] Embodiment 2:

[0050] A method for detecting the depth of an airtight belt groove of an aircraft cabin cover, comprising the following steps:

[0051] Step 1: Make preparations before measurement, check whether the limit mechanism and clamping mechanism of the measuring device meet the measurement requirements. The operator 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 tidy, without metal chips, excess paint, etc.;

[0052] Step 2: The operator holds the measuring device, takes any position of the airtight belt groove, and inserts the outer wall into the measuring device, so that the lower end surface of the side wall of the airtight belt groove contacts the two M3 supporting roller bolts 14, and then the side wall of the airtight belt groove is firmly positioned by the limit block 2 in the limit mechanism of the measuring device and the clamping piece 6 in the clamping mechanism to prevent the measuring device from being deflected and affecting the measurement accuracy;

[0053] 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, and the display screen 16 will display the groove depth at the current position. The handheld measuring device is slowly moved along the measuring moving direction, and the lower end surface of the side wall of the airtight belt groove drives the supporting roller bolt 14 to roll. Due to the continuous change of the groove depth, the measurement data of the laser ranging 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 belt groove at a certain location is less than 15.00 mm, it proves that the groove depth at that location is unqualified, the color of the display screen turns red to give an alarm reminder, and the groove depth value of the unqualified location is recorded at the same time;

[0055] Step 5: During the measurement process, if the minimum value of the groove depth at a certain position needs to be recorded, the operator can record the minimum value of the groove depth on the display screen 16 by touching the record key 17. If the groove depth at other positions needs to be recorded, the operator touches the record key 17 again, and the display screen 16 will record the minimum value of the current position. All minimum values ​​are compared again through the software comparison function minx, y, and finally the minimum value of the groove depth is recorded;

[0056] Step 6: After completing the measurement of the outer wall of the gas-tight belt groove, measure the groove depth of the inner wall of the gas-tight belt groove in the same way;

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

Claims

1. An aircraft canopy airtight groove depth measuring device, characterized in that: It comprises a U-shaped support (1), a limit block (2), an M3 fixing bolt (3), a spring (4), a clamping stud (5), a clamping plate (6), a shaft sleeve (7), a limit nut (8), a bearing (9), a fixing nut (10), a laser distance sensor (11), an M3 screw (12), a sensor bracket (13), a supporting roller bolt (14), a sensor connecting terminal (15), a display screen (16), a recording key (17), a reset key (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) is internally provided with two limit blocks (2), which are connected by four M3 fixing bolts (3). Through the hole, two M3 support roller bolts (14) are passed through the inner holes of the bearing (9) and the limit block (2) at the same time, and the other end is fixed with a fixing nut (10) to support the roller bolt (14); the clamping mechanism is composed of a spring (4), a clamping stud (5), a clamping sheet (6), a shaft sleeve (7) and a limit nut (8). Four shaft sleeves (7) with an inner diameter of 3 mm are installed on the upper part of the U-shaped support (1), and four M3 clamping studs (5) are passed through the shaft The sleeve (7) has 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 surface of the airtight groove side wall is in contact with two M3 supporting roller bolts (14). While limiting by two limit blocks (2), the two-way clamping of the airtight groove side wall is achieved by four clamping plates (6) of the clamping mechanism. The sensor bracket (13) is fixed to the U-shaped support (1) by means of M3 screws (12). The lower end surfaces of the sensor bracket (13) and the U-shaped support (1) are in the same plane. Y=((0.009765625*X+25)+H2)-H1 calculation method; The laser distance measuring sensor (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 distance measuring sensor (11) through a cable, and the other end is connected to the control module (23); the laser distance measuring sensor (11) transmits real-time collected data to the control module (23), and the measurement data is displayed on the display screen (16); and the power switch (19) is installed at the opening of the control box (20).

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

3. The device for measuring the depth of the airtight groove of an aircraft canopy according to claim 1 or 2, characterized in that: The distance between the two limit blocks (2) is 5 mm, and they are used for limiting and fixing the side wall of the airtight groove with a wall thickness of 5 mm.

4. The device for measuring the depth of the airtight groove of an aircraft canopy according to claim 1 or 2, characterized in that: The laser distance measuring sensor (11) has a selected measuring range of 30±5 mm.

5. The aircraft cabin cover airtight belt groove depth measuring device according to claim 3, characterized in that: The laser distance measuring sensor (11) has a selected measuring range of 30±5 mm.

6. The device for measuring the depth of the airtight groove of an aircraft canopy according to 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 increased to 5.0V through the boost module (22), which is used to simultaneously power the control module (23), the display screen (16) and the laser ranging sensor (11).

7. The aircraft cabin cover airtight belt groove depth measuring device according to claim 3, characterized in that: The power module (21) uses a 3.7V lithium battery, and the 3.7V DC voltage is increased to 5.0V through the boost module (22), which is used to simultaneously power the control module (23), the display screen (16) and the laser ranging sensor (11).

8. The device for measuring the depth of the airtight groove of an aircraft canopy as claimed in claim 4, characterized in that: The power module (21) uses a 3.7V lithium battery, and the 3.7V DC voltage is increased to 5.0V through the boost module (22), which is used to simultaneously power the control module (23), the display screen (16) and the laser ranging sensor (11).

9. The device for measuring the depth of the airtight groove of an aircraft canopy as claimed 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 button.

10. The detection method of the aircraft cabin cover airtight belt groove depth measuring device according to any one of claims 1 to 9, characterized in that: Here are the steps: Step 1: Make preparations before measurement, check whether the limit mechanism and clamping mechanism of the measuring device meet the measurement requirements. The operator must be qualified to use the measuring device, and ensure that the inside and surface of the entire airtight belt groove are clean and tidy; Step 2: The operator holds the measuring device, takes any position of the airtight belt groove, and inserts the outer wall into the measuring device so that the lower end surface of the side wall of the airtight belt groove contacts the two M3 supporting roller bolts (14), and then the side wall of the airtight belt groove is firmly positioned by the limit block (2) in the limit mechanism of the measuring device and the clamping piece (6) in the clamping mechanism to prevent the measuring device from being deflected and affecting the measurement accuracy; 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, and the display screen (16) will display the groove depth at the current position. The handheld measuring device is slowly moved along the measuring moving direction, and the lower end surface of the side wall of the airtight belt groove drives the supporting roller bolt (14) to roll. Due to the continuous change of the groove depth, the measurement data of the laser ranging sensor (11) also changes continuously; Step 4: According to the measurement requirements, if the display screen (16) shows that the depth of the airtight belt groove at a certain location is less than 15.00 mm, it proves that the groove depth at that location is unqualified, the color of the display screen turns red to give an alarm reminder, and the groove depth value of the unqualified location is 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 touches the record key (17) again, and the display screen (16) will record the minimum value of the current position. All minimum values ​​are compared again through 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 gas-tight belt groove, measure the groove depth of the inner wall of the gas-tight belt groove in the same way; Step 7: After the double-sided groove depth measurement is completed, the operator records the data on the display screen (16) according to relevant requirements, turns off the power switch (19), and the measurement is completed.

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