Method and device for measuring the angle of a countersink in an aircraft

Abstract

The application provides a kind of aircraft countersunk hole angle measuring method and device, belong to aircraft assembly detection field.The application is realized based on special digital measuring tool, the bottom of the tool is equipped with two transversely arranged measuring contacts, which is matched with sensor rod to convert the transverse displacement of measuring contact into vertical displacement of sensor rod, and the digital display and compliance determination of angle is realized by using pressure displacement sensor and the conversion method of Pythagorean theorem, and automatic calculation is directly realized by using single-chip microcomputer and controller, the displacement sensed by pressure displacement sensor is converted into countersunk hole angle by using trigonometric function relationship, and the angle indication is read out, which is quantitative inspection, only the indication is compared with the range of countersunk hole angle, and the buzzer is used for warning if it is out of range, which is qualitative inspection, the measurement of countersunk hole angle can be realized by using the two kinds of inspection methods, and digital display is realized by using OLED display screen, which avoids the error caused by manual reading and calculation, greatly improves work efficiency and measurement accuracy.

Description

Technical Field

[0001] This invention belongs to the field of aircraft assembly and inspection, and relates to a method and device for measuring the countersunk corner angle of an aircraft. Specifically, it relates to a qualified inspection method and special tool for the countersunk corner angle quality of aviation products, which can quickly complete the conformity judgment of the countersunk corner angle quality. Background Technology

[0002] With the development of aviation technology, the aerodynamic shape requirements of aviation products are becoming increasingly stringent. Their outer surfaces are mostly connected by countersunk standard parts such as countersunk rivets and countersunk bolts. The concavity and convexity requirements of the countersunk standard parts are particularly important. The biggest factor affecting the concavity and convexity of the countersunk standard parts is that the countersunk recesses that mate with them do not meet the quality requirements. In order to achieve the expected aerodynamic shape requirements, the countersunk recess angle is allowed to be within the range of 120±1°, and the countersunk recess angle on one side is allowed to be within 60±0.5°. Exceeding the range is considered out of tolerance. Out of tolerance will cause the standard parts to be misaligned after installation, affecting the aerodynamic shape quality. Such cases will be treated as non-conforming products. There are no dedicated tools for measuring the angle of countersunk sockets in either qualitative or quantitative inspection methods, making it impossible to measure the angle of countersunk sockets. At present, when checking the angle of countersunk sockets, we can only rely on a standard part of the same specification to conduct trial checks. The quality error of the standard part is relatively large, and human factors have a significant impact. Improper operation can easily lead to measurement errors. Therefore, if the countersunk standard part used for trial checks has a large manufacturing error or if the operation is improper, it can easily cause batch quality problems.

[0003] After comparing relevant patents, it was found that current methods for measuring the countersunk head angle still have shortcomings and deficiencies. For example, patent CN 104713458B, a method for measuring the countersunk head angle, has the advantage of enabling quantitative measurement. It can calculate the actual countersunk head angle based on the reading, and its accuracy is improved compared to the trial method, thus overcoming the low accuracy of the trial method. However, although this invention patent can meet the requirements for quantitative inspection, the final actual measured angle of the countersunk head angle still requires inspection technicians and operators to convert the geometric relationship of the measured length value to indirectly obtain the actual measured angle of the countersunk head angle. Because it is obtained indirectly, it is easy to cause error accumulation, which leads to a decrease in accuracy and cannot fully guarantee the accuracy of angle measurement. Furthermore, this invention cannot directly read the countersunk head angle; calculating the angle significantly reduces efficiency and increases the cost of manual measurement. Summary of the Invention

[0004] To facilitate both qualitative and quantitative inspections of the countersunk socket angle, address the inspection needs of both aspects, meet the measurement requirements for different apertures, and enable the recording of measured values ​​and conformity judgment, this invention provides a method for measuring the countersunk socket angle of aircraft. Based on a dedicated digital measuring tool, it utilizes a high-precision pressure displacement sensor and the Pythagorean theorem to achieve digital display and conformity judgment of the angle. The dimension sensed by the pressure displacement sensor is converted into the countersunk socket radius using trigonometric functions, and then the radius is converted into the countersunk socket angle. Reading the angle reading constitutes a quantitative inspection, while comparing the reading with the countersunk socket angle within a certain range and triggering a buzzer warning if the range is exceeded constitutes a qualitative inspection. Both inspection methods can measure the countersunk socket angle, and the use of this method and tool significantly improves the work efficiency and measurement accuracy of inspection technicians and operators.

[0005] This invention enables both quantitative and qualitative detection methods, while automatically calculating the countersunk angle using a microcontroller and controller, and displaying the result digitally on an OLED screen. This avoids errors caused by manual reading and calculation, freeing up the hands of inspection technicians and operators, and improving efficiency and accuracy.

[0006] The present invention adopts the following technical solution:

[0007] A method for measuring the angle of a nose cone in an aircraft is based on a dedicated digital measuring tool for measuring the nose cone angle. It utilizes a pressure displacement sensor and the Pythagorean theorem to achieve digital display and conformity determination of the angle, thereby improving the accuracy of the measurement results and the efficiency of the inspection process. It enables both quantitative and qualitative measurements. The dedicated digital measuring tool includes an upper structure, a lower structure, and an internal structure.

[0008] The upper structure includes a charging port 1, an upper main housing 2, an upper rear cover 3, a switch button 4, a display screen 5, a record / reset button 6, and a buzzer alarm 11. The upper main housing 2 is a hollow square support structure, and the upper rear cover 3 is fixedly connected to the rear side of the upper main housing 2, ensuring high connection strength and reliability. The charging port 1, switch button 4, display screen 5, record / reset button 6, and buzzer alarm 11 are all located on the upper main housing 2. The charging port 1 is the charging part, directly connected to the charging module 12 in the internal structure. The switch button 4 is used to turn the device on and off. The display screen 5 is used to display the measurement results. The record / reset button 6 is used for data acquisition and reset. The buzzer alarm 11 is a fault-prevention device. When the countersunk angle exceeds the tolerance during qualitative measurement, the buzzer alarm 11 will sound an alarm to prevent the fault from going undetected, thus playing a fault-prevention role.

[0009] The lower structure includes a hollow double-ended stud 7, a lower housing 8, a lower rear cover 9, a tightening screw 10, a measuring block 20, and a measuring contact 21. The hollow double-ended stud 7 is a hollow structure; its upper end is fixedly connected to the lower end face of the upper main housing 2, and its lower end is fixedly connected to the upper end of the lower housing 8. Its hollow structure allows the sensor rod 17 in the internal structure to pass through, connecting the main housing 2 and the lower housing 8 without hindering the movement of the sensor rod 17. The lower housing 8 is a hollow tubular structure with openings in its side walls. The lower rear cover 9 is fixedly connected to the opening of the lower housing 8 by the tightening screw 10. The measuring block 20 is generally conical in shape, used to support the measuring contact 21 and provide vertical measurement guidance. It is fixedly connected to the lower end of the lower housing 8. A cylindrical guide post is provided at the tip position, with the outer diameter of the guide post matching the inner diameter of the countersunk hole. A radial through hole is provided in the middle of the conical surface. The measuring block 20 located on the upper side of the through hole has an axial inner hole for inserting the sensor rod 17 in the internal structure, and the inner hole communicates with the radial through hole. The measuring contact 21 is the main working part, with a columnar structure. Both ends of the contact are beveled, with one end face at a 45° angle and the other end face at the same theoretical angle as the countersunk hole. There are two measuring contacts 21 with the same structure. They are inserted into the radial through hole of the measuring block 20 from both sides, with the 45° angled end facing inward as the inner end face. After insertion, the outer end face of the measuring contact 21 protrudes from the conical surface of the measuring block 20, and the measuring contact 21 can slide within the through hole.

[0010] The internal structure includes a charging module 12, a power supply module 13, a microcontroller 14, a controller 15, a sensor 16, a sensor rod 17, a return spring 18, and a pin 19. The sensor rod 17 includes two identical optical rods, both with beveled bottoms at a 45° angle. The two optical rods are placed side-by-side with their bevels facing outwards to form the sensor rod 17. The sensor rod 17 is placed inside the lower housing 8, with its upper end passing through the hollow double-ended stud 7. The two optical rods then engage with the sensor 16. The lower end of the sensor rod 17 passes into the axial inner hole at the top of the measuring block 20. The beveled bottoms of the two optical rods are respectively in contact with the inner end faces of the measuring contacts 21 on both sides, and the two optical rods can move up and down respectively. 7. The spring 18 and the pin 19 work together. Specifically, the two smooth rods of the sensor rod 17 have radial holes in their middle sections. The two pins 19 are inserted into the two holes and protrude from the outer wall of the smooth rod. The two springs 18 are fixed between the two pins 19 and the hollow double-ended stud 7 to provide the smooth rod with a restoring force. In the initial state, the bottom end of the sensor rod 17 rests against the bottom of the axial inner hole of the measuring block 20. During measurement, the measuring contact 21 moves inward, pushing the sensor rod 17 upward, converting the lateral movement of the measuring contact 21 into the vertical movement of the sensor rod 17, thus completing the measurement of the countersunk angle of different hole diameters. During the measurement process, the spring 18 is compressed, generating a restoring force. After the measurement is completed, the spring 18... The rebound force pushes the sensor rod 17 back to its initial state, preparing for the next measurement. The charging module 12, power module 13, microcontroller 14, controller 15, and sensor 16 are all located inside the upper main housing 2. Among them, sensor 16 is a data acquisition mechanism, which adopts a high-precision pressure displacement sensor with high reliability and accuracy, and a measurement accuracy of 0.01°, meeting the measurement resolution requirements. It acquires the displacement signals of the two optical rods of sensor rod 17 and transmits them to microcontroller 14. Microcontroller 14 and controller 15 cooperate to realize data conversion. Sensor rod 17 transmits the vertical displacement signal to sensor 16, generating a corresponding voltage signal, and microcontroller 14 converts the voltage... The signal is converted into an angle signal and the angle value is displayed on the display screen 5, completing the entire process from data sampling to display. During qualitative measurement, if the measured angle does not meet the requirements, the microcontroller 14 sends a command to the buzzer alarm 11 through the controller 15 to drive the buzzer alarm 11 to complete the alarm action. The charging module 12 and the power module 13 are the power supply system. The charging module 12 is used to connect the charging port 1 and the power module 13, and the power from the charging port 1 is channeled into the power module 13 through the charging module 12 to realize the storage of power. The power is used to realize the functions of the switch button 4, the display screen 5, the record / reset button 6, the buzzer alarm 11, the microcontroller 14, the controller 15 and the sensor 16.

[0011] The dedicated digital measuring tool converts the lateral displacement of the measuring contact 21 into the vertical displacement of the sensor rod 17. Since the contact surface between the sensor rod 17 and the measuring contact 21 is at a 45° angle, the vertical displacement of the sensor rod 17 is equal to the lateral displacement of the measuring contact 21. Because the vertical displacement of the sensor rod 17 can be directly obtained, the lateral displacement of the measuring contact 21 can be derived by reverse calculation. Figure 3 As shown, H is the vertical fixed dimension, which is the distance from the upper surface of the measuring contact 21 to the junction of the guide post and the conical surface of the measuring block 20; L is the initial lateral dimension, which is the distance between the outer top of the measuring contact 21 and the axis of the measuring block 20 in the initial state; x 左 and x 右 The vertical displacements of the two optical rods of sensor rod 17 are respectively taken as the vertical displacements. After mathematical trigonometric transformation, the measured angles on both sides of the countersunk notch can be obtained as: θ 左 =arctan(H / (Lx) 左 )) and θ 右 =arctan(H / (Lx) 右 )).

[0012] Furthermore, the upper main shell 2 and the upper rear cover 3 are 3D printed using PLA biodegradable material, which has the characteristics of high heat resistance, high tensile strength, high compressive strength and good wear resistance.

[0013] Furthermore, the switch button 4 is a push-button switch, which can realize automatic functions. A single click turns on the power and selects the quantitative measurement mode, and a second click turns off the power. A double click turns on the power and selects the qualitative measurement mode, and a second click turns off the power.

[0014] Furthermore, clicking the Record / Reset button 6 enables the data recording function, at which point the display shows the measured values. Double-clicking the Record / Reset button 6 enables the data reset function, at which point the display shows the initial angle, thus achieving the recording and reset functions of this button.

[0015] A method for measuring the nose cone angle of an aircraft based on the aforementioned dedicated digital measurement tool includes quantitative measurement and qualitative measurement. One or both methods can be selected according to measurement requirements. Specifically:

[0016] The quantitative measurement includes the following steps:

[0017] Step 1: Click and press the dedicated digital measuring tool switch button 4 to select the quantitative measurement mode. At this time, the display screen 5 will light up and display the initial angle;

[0018] Step 2: Move the measuring contact 21 and observe whether the measured angle value on the display screen 5 changes continuously. Continuous change indicates that this special digital measuring tool meets the requirements for continuous use. Click and press the record / reset button 6 and observe whether the angle on the display screen 5 remains fixed. If it remains fixed, it indicates that the recording function is working properly. At this time, double-click and press the record / reset button 6 and observe whether the angle on the display screen 5 returns to the initial angle. If it returns to the initial angle, it meets the usage requirements and the reset function is working properly.

[0019] Step 3: Insert the special digital measuring tool into the countersunk hole to be measured, so that the lower guide post of the measuring block 20 is inserted into the countersunk hole until it can no longer be inserted. At this time, the measuring contacts 21 on both sides are in close contact with the countersunk hole. The countersunk hole pushes the measuring contacts 21 to move inward, which in turn pushes the two light rods of the sensor rod 17 to move upward respectively. The sensor 16 acquires the displacement of the two light rods and generates a voltage signal, which is transmitted to the controller 15. The controller 15 converts the voltage signal into an angle value and displays it on the display screen 5.

[0020] Step 4: Keep the dedicated digital measuring tool vertical and stationary. Once the value displayed on display 5 stabilizes, click and press the Record / Reset button 6. The recording function will then be activated, and the value displayed on display 5 will be the countersunk angle reading. If both sides meet the range of 60±0.5°, the countersunk is considered qualified. For unqualified countersunks, the deviation value will be calculated based on the angle value. After measurement, double-click the Record / Reset button 6 to reset. The reset function will then be activated, and the angle displayed on display 5 will show the initial angle. Repeat the measurement three times.

[0021] Step 5: After all measurements are completed, click and press the power button 4 to turn off the machine.

[0022] The qualitative measurement includes the following steps:

[0023] Step 1: Double-click to press the power button 4 of the dedicated digital measuring tool, select the qualitative measurement mode, at which point the display screen 5 will light up and display the initial angle;

[0024] Step 2: Move the measuring contact 21 and observe whether the measured angle value on the display screen 5 changes continuously. Continuous change indicates that the dedicated digital measuring tool meets the requirements for continuous use. Click and press the record / reset button 6 and observe whether the angle on the display screen 5 remains fixed. If it remains fixed, it indicates that the recording function is working properly. At this time, double-click and press the record / reset button 6 and observe whether the angle on the display screen 5 returns to the initial angle. If it returns to the initial angle, it meets the usage requirements and the reset function is working properly.

[0025] Step 3: Insert the special digital measuring tool into the countersunk hole to be measured, so that the lower guide post of the measuring block 20 is inserted into the countersunk hole until it can no longer be inserted. At this time, the measuring contacts 21 on both sides are in close contact with the countersunk hole. The countersunk hole pushes the measuring contacts 21 to move inward, which in turn pushes the two light rods of the sensor rod 17 to move upward respectively. The sensor 16 acquires the displacement of the two light rods and generates a voltage signal, which is transmitted to the controller 15. The controller 15 converts the voltage signal into an angle value and displays it on the display screen 5.

[0026] Step 4: Keep the dedicated digital measuring tool vertical and stationary. Wait for the angle display on screen 5 to stabilize. If the angle on any side of the countersunk head exceeds 60±0.5°, the angle of the countersunk head is out of tolerance. The microcontroller 14 will then control the buzzer 11 to sound an alarm through the controller 15, indicating that the countersunk head is unqualified. If the buzzer 11 does not sound an alarm, the countersunk head is qualified. After the measurement is completed, double-click the record / reset button 6 to reset. At this time, the reset function is activated, and the angle display on screen 5 will show the initial angle. Repeat the measurement three times.

[0027] Step 5: After all measurements are completed, click the power button 4 to turn off the machine.

[0028] The beneficial effects of this invention are as follows:

[0029] Research on existing measurement methods and tools reveals that measuring the countersunk angle of aircraft nose cones is difficult and inefficient. Furthermore, the calculation of the nose cone angle by humans is highly dependent on human judgment, and subjective judgment and operating methods have a significant impact on the measurement results. Digital display is not possible, and the standard part trial method for determining whether the nose cone is qualified is also limited by the manufacturing precision of the standard parts. These problems seriously affect the delivery quality of nose cones and the work efficiency of inspection technicians, which in turn affect the final product delivery quality and delivery cycle.

[0030] This invention provides quantitative measurement of the countersunk angle, facilitating the recording of product manufacturing data in aircraft manufacturing and improving the traceability of measurement results. Qualitative measurement is used to determine the conformity of the countersunk angle, which can be used for self-inspection in daily production processes, improving self-inspection efficiency. Functionally, this invention eliminates the shortcomings of traditional manual calculation, utilizing a microcontroller and controller to process sensor sampling data, thus avoiding errors caused by human factors. Its accuracy reaches 0.01°, with precision and resolution far exceeding traditional measurement methods and tools. Furthermore, an OLED display screen is used to display the countersunk angle accurately, avoiding reading errors. Structurally, this invention solves complex measurement problems with a simple mechanical structure. It cleverly utilizes the contact angle between the sensor rod and the measuring contact to transmit the movement of the measuring contact to the sensor rod in a 1:1 ratio, allowing the sensor to obtain the movement of the measuring contact. The Pythagorean theorem is cleverly used to achieve digital measurement of the countersunk angle, enabling the measurement of countersunk angles with different apertures.

[0031] This invention features a simple structure, small size, and convenient operation and portability. Its application significantly improves the efficiency of countersunk angle measurement and the accuracy of countersunk angle quality control, playing a positive role in ensuring the quality of countersunk components and the aerodynamic shape of aircraft products. Furthermore, by widely applying this method in the workplace, inspection technicians and operators can achieve dual digital measurement and quality control, enabling timely detection of quality problems and resolution at the source. This avoids increasing the difficulty and cost of troubleshooting in downstream processes, thereby saving labor and time costs and effectively shortening the delivery cycle. Attached Figure Description

[0032] Figure 1 It is an isometric drawing obtained using a specialized digital measuring tool;

[0033] Figure 2 This is the front view of a specialized digital measurement tool;

[0034] Figure 3 It is the main sectional view of a dedicated digital measuring tool;

[0035] In the diagram: 1-Charging port; 2-Upper main housing; 3-Upper rear cover; 4-Switch button; 5-Display screen; 6-Record / Reset button; 7-Hollow double-ended stud; 8-Lower housing; 9-Lower rear cover; 10-Tightening screw; 11-Buzzer alarm; 12-Charging module; 13-Power supply module; 14-Microcontroller; 15-Controller; 16-Sensor; 17-Sensor rod; 18-Rebound spring; 19-Pin; 20-Measuring block; 21-Measuring contact. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments derived by those skilled in the art based on the embodiments of the present invention through modifications or adjustments are within the protection scope of the present invention.

[0037] Example 1

[0038] A method for measuring the countersunk angle of an aircraft nose cone is based on a dedicated digital measuring tool. It utilizes a pressure-displacement sensor and the Pythagorean theorem to achieve digital display and conformity determination of the angle, improving the accuracy of measurement results and the efficiency of the inspection process. This method enables both quantitative and qualitative measurements. The dedicated digital measuring tool includes an upper structure, a lower structure, and an internal structure, such as... Figures 1 to 3 As shown.

[0039] like Figure 1 and Figure 2 As shown, the upper structure includes a charging port 1, an upper main housing 2, an upper rear cover 3, a switch button 4, a display screen 5, a record / reset button 6, and a buzzer alarm 11; the upper main housing 2 is a hollow square support structure, and the upper rear cover 3 uses four The screws are fixedly connected to the rear side of the upper main housing 2, ensuring high connection strength and reliability. Both the upper main housing 2 and the upper rear cover 3 are 3D printed using PLA biodegradable material, featuring high heat resistance, high tensile strength, high compressive strength, and good wear resistance. The charging port 1, switch button 4, display screen 5, record / reset button 6, and buzzer alarm 11 are all located on the upper main housing 2, ensuring a certain connection strength. The charging port 1 is the charging part, directly connected to the charging module 12 in the internal structure, and uses a Type-C interface for easy universality. The switch button 4 is used to turn the dedicated digital measuring tool on and off. The display screen 5 uses a 1.3-inch OLED display, featuring clear screen and bright brightness. The record / reset button 6 is for data acquisition and reset. The buzzer alarm 11 is a fault-prevention device. When using qualitative measurement, if the measured value of the countersunk angle on one side exceeds 60±0.5°, the buzzer alarm 11 will sound an alarm to prevent the fault from going undetected, thus playing a fault-prevention role.

[0040] like Figure 1As shown, the lower structure includes a hollow double-ended stud 7, a lower housing 8, a lower rear cover 9, a tightening screw 10, a rebound spring 18, a measuring block 20, and a measuring contact 21. The hollow double-ended stud 7 is a hollow structure in the middle, with its upper end fixedly connected to the lower end face of the upper main housing 2 and its lower end fixedly connected to the upper end of the lower housing 8. The hollow structure in the middle is used to insert the sensor rod 17 into the internal structure, connecting the main housing 2 and the lower housing 8 without hindering the movement of the sensor rod 17. The lower housing 8 is a hollow tubular structure with openings on its side walls. The lower rear cover 9 utilizes four... Tightening screw 10 is connected to the opening of the lower housing 8; the measuring block 20 is generally conical, used to support the measuring contact 21 and the vertical measuring guide, and is threaded to the lower end of the lower housing 8, ensuring a reliable and safe connection. A cylindrical guide post is provided at the tip of the cone, with its outer diameter matching the inner diameter of the countersunk hole. A radial through hole is provided in the middle of the conical surface, and the measuring block 20 located above this through hole has an axial inner hole for inserting the sensor rod 17 into the internal structure. This inner hole is aligned with... The radial through holes are interconnected; the measuring contact 21 is the main working part, with a columnar structure. Both ends of the contact are inclined, with one end at a 45° angle and the other end at the same theoretical angle as the countersunk head. There are two measuring contacts 21 with the same structure. They are inserted into the radial through holes of the measuring block 20 from both sides, with the 45° angled end facing inward as the inner end face. After insertion, the outer end face of the measuring contact 21 protrudes from the tapered surface of the measuring block 20, and the measuring contact 21 can slide within the through hole.

[0041] like Figure 3As shown, the internal structure includes a charging module 12, a power supply module 13, a microcontroller 14, a controller 15, a sensor 16, a sensor rod 17, a return spring 18, and a pin 19. The sensor rod 17 includes two identical optical rods, both with beveled bottoms at a 45° angle. The two optical rods are placed side-by-side with their bevels facing outwards to form the sensor rod 17. The sensor rod 17 is placed inside the lower housing 8, with its upper end passing through the hollow double-ended stud 7. The two optical rods then engage with the sensor 16. The lower end of the sensor rod 17 is inserted into the axial inner hole at the top of the measuring block 20. The beveled bottoms of the two optical rods are respectively in contact with the inner end faces of the measuring contacts 21 on both sides. The two optical rods can move up and down respectively. The sensor rod 17, the return spring 18, and the pin 19 work together. The two optical rods of the sensor rod 17 have radial holes in their middle parts. The two pins 19 are inserted into the two holes respectively and protrude from the outer wall of the optical rod. The two return springs 18 are fixed between the two pins 19 and the hollow double-ended studs 7 respectively, which are used to provide a return force for the optical rod after it moves upward. In the initial state, the bottom end of the sensor rod 17 abuts against the bottom of the axial inner hole of the measuring block 20. During measurement, the sensor rod 17 moves with the measuring contact 21, converting the lateral movement of the measuring contact 21 into the vertical movement of the sensor rod 17, thereby completing the measurement of different holes. In the measurement of the radial countersunk angle, the return spring 18 is compressed during the measurement process, generating a rebound force. After the measurement is completed and the data is fixed, the rebound force of the return spring 18 pushes the sensor rod 17 back to its initial state, preparing for the next measurement. The sensor 16 is a data acquisition mechanism, which adopts a high-precision pressure displacement sensor with high reliability and accuracy, and a measurement accuracy of up to 0.01°, meeting the resolution requirements of the measurement. It cooperates with the two optical rods of the sensor rod 17 to sense the displacement and transmit the displacement data to the microcontroller 14. The microcontroller 14 cooperates with the controller 15 to realize the data conversion. The vertical displacement signal is transmitted to the sensor 16, generating a corresponding voltage signal. The controller 15 converts the voltage signal into an angle signal and displays the angle signal value on the display screen 5, completing the entire process from data sampling to display. The charging module 12 and the power module 13 form a power supply system. The charging module 12 connects the charging port 1 and the power module 13, allowing the power from the charging port 1 to be channeled into the power module 13 for power storage. The power is then used to implement the functions of the switch button 4, the display screen 5, the record / reset button 6, the buzzer alarm 11, the microcontroller 14, the controller 15, and the sensor 16.

[0042] The lateral displacement of the measuring contact 21 is converted into the vertical displacement of the sensor rod 17. Since the contact surface between the sensor rod 17 and the measuring contact 21 is at a 45° angle, the vertical displacement of the sensor rod 17 is equal to the lateral displacement of the measuring contact 21. Because the vertical displacement of the sensor rod 17 can be directly obtained, the lateral displacement of the measuring contact 21 can be derived by reverse deduction. Figure 3 As shown, H is the vertical fixed dimension, which is the distance from the upper surface of the measuring contact 21 to the junction of the guide post and the conical surface of the measuring block 20; L is the initial lateral dimension, which is the distance between the outer top of the measuring contact 21 and the axis of the measuring block 20 in the initial state; x 左 and x 右 The vertical displacements of the two optical rods of sensor rod 17 are respectively taken as the vertical displacements. After mathematical trigonometric transformation, the measured angles on both sides of the countersunk notch can be obtained as: θ 左 =arctan(H / (Lx) 左 )) and θ 右 =arctan(H / (Lx) 右 )).

[0043] A method for measuring the turret angle of an aircraft based on the aforementioned dedicated digital measurement tool includes quantitative measurement and qualitative measurement. This embodiment uses quantitative measurement, which includes the following steps:

[0044] Step 1: Take out the special tool for measuring the countersunk head angle, and check whether the labels are complete and the appearance is intact;

[0045] Step 2: Click and press the switch button 4 to select the quantitative measurement mode. At this time, the display screen 5 will light up and display the initial angle;

[0046] Step 3: Gently move the measuring contact 21 by hand and observe whether the measured angle value on the display screen 5 changes continuously. Continuous change indicates that the special digital measuring tool meets the requirements for continuous use.

[0047] Step 4: Click and press the Record / Reset button 6, and observe whether the angle of the display screen 5 remains unchanged. If it remains unchanged, it means that the recording function is working properly. At this time, double-click and press the Record / Reset button 6, and observe whether the angle of the display screen 5 returns to the initial angle. If it returns to the initial angle, it meets the usage requirements and the reset function is working properly.

[0048] Step 5: Insert the special digital measuring tool into the countersunk hole to be measured, so that the lower guide post of the measuring block 20 is inserted into the countersunk hole until it can no longer be inserted. At this time, the measuring contacts 21 on both sides are in close contact with the countersunk hole. The countersunk hole pushes the measuring contacts 21 to move inward, which in turn pushes the two light rods of the sensor rod 17 to move upward respectively. The sensor 16 acquires the displacement of the two light rods and generates a voltage signal, which is transmitted to the controller 15. The controller 15 converts the voltage signal into an angle value and displays it on the display screen 5.

[0049] Step Six: Keep the screen vertical and stationary until the angle displayed on screen 5 stabilizes. Then, press and hold the Record / Reset button 6. The recording function will then be activated, and screen 5 will display θ. 左 60.11°, θ 右 If the angle is 59.88° and both sides meet the range of 60±0.5°, then the countersunk head is qualified. After the measurement is completed, double-click the record / reset button 6 to reset. At this time, the reset function is activated, and the angle on the display screen 5 displays the initial angle. Repeat the measurement three times to avoid the instability of the tool.

[0050] Step 7: After the measurement is completed, click the power button 4 to turn off the machine, wipe the special digital measuring tool clean and put it away, returning it to its original position.

[0051] Example 2

[0052] Qualitative measurements using the dedicated digital measurement method described in Example 1 include the following steps:

[0053] Step 1: Take out the dedicated digital measuring tool and check if the labels are complete and the appearance is intact;

[0054] Step 2: Double-click to press switch button 4 to select qualitative measurement mode. At this time, display screen 5 will light up and show the initial angle.

[0055] Step 3: Gently move the measuring contact 21 by hand and observe whether the measured angle value on the display screen 5 changes continuously. Continuous change indicates that this special digital measuring tool meets the requirements for continuous use.

[0056] Step 4: Click and press the Record / Reset button 6, and observe whether the angle of the display screen 5 remains unchanged. If it remains unchanged, it means that the recording function is working properly. At this time, double-click and press the Record / Reset button 6, and observe whether the angle of the display screen 5 returns to the initial angle. If it returns to the initial angle, it meets the usage requirements and the reset function is working properly.

[0057] Step 5: Insert the special digital measuring tool into the countersunk hole to be measured, so that the lower guide post of the measuring block 20 is inserted into the countersunk hole until it can no longer be inserted. At this time, the measuring contacts 21 on both sides are in close contact with the countersunk hole. The countersunk hole pushes the measuring contacts 21 to move inward, which in turn pushes the two light rods of the sensor rod 17 to move upward respectively. The sensor 16 acquires the displacement of the two light rods and generates a voltage signal, which is transmitted to the controller 15. The controller 15 converts the voltage signal into an angle value and displays it on the display screen 5.

[0058] Step Six: Keep the dedicated digital measuring tool vertical and stationary. Once the angle displayed on screen 5 stabilizes, the buzzer alarm 11 will sound, indicating that the angle on one side of the countersunk head exceeds the range of 60±0.5°. Double-click the record / reset button 6 to reset. The reset function will then be activated, and the angle displayed on screen 5 will show the initial angle. Repeat the measurement three times. The buzzer alarm 11 will sound in each measurement. The measurement result is that the angle of the countersunk head is out of tolerance and unqualified. Record the result.

[0059] Step 7: After the measurement is completed, click the power button 4 to turn off the machine, wipe the special digital measuring tool clean and put it away, returning it to its original position.

[0060] The above-described embodiments are merely illustrative of the implementation methods of the present invention, but should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A measuring device for the angle of the nose cone of an aircraft, characterized in that, It includes the superstructure, substructure, and internal structure; The upper structure includes a charging port (1), an upper main housing (2), an upper rear cover (3), a switch button (4), a display screen (5), a record / reset button (6), and a buzzer alarm (11); the upper main housing (2) is a hollow square support structure, and the upper rear cover (3) is fixedly connected to the rear side of the upper main housing (2); the charging port (1), switch button (4), display screen (5), record / reset button (6), and buzzer alarm (11) are all located on the upper main housing (2), wherein the charging port (1) is directly connected to the charging module (12) in the internal structure, the switch button (4) is used to turn on and off the power, the display screen (5) is used to display the measurement results, the record / reset button (6) is used for data acquisition and reset, and the buzzer alarm (11) is used to sound an alarm when the countersunk head exceeds the tolerance; The lower structure includes a hollow double-ended stud (7), a lower housing (8), a lower rear cover (9), a measuring block (20), and a measuring contact (21). The hollow double-ended stud (7) is a hollow structure, with its upper end fixedly connected to the lower end face of the upper main housing (2) and its lower end fixedly connected to the upper end of the lower housing (8). Its hollow structure is used for the sensor rod (17) in the internal structure to pass through. The lower housing (8) is a hollow tubular structure with an opening on its side wall. The lower rear cover (9) is fixedly connected to the opening of the lower housing (8). The measuring block (20) is generally conical and is used to support the measuring contact (21) and the vertical measuring guide. It is fixedly connected to the lower end of the lower housing (8). Next, a cylindrical guide post is provided at the tip of the cone, and a radial through hole is provided in the middle of the cone surface. The measuring block (20) located on the upper side of the through hole is provided with an axial inner hole, and the inner hole is connected to the radial through hole. The measuring contact (21) has a columnar structure, and both ends of the end face are inclined. One end face is at a 45° angle, and the other end face is at the same theoretical angle as the countersunk head. There are two measuring contacts (21) with the same structure. They are inserted into the radial through hole of the measuring block (20) from both sides, and the end at a 45° angle faces inward, which is the inner end face. After insertion, the outer end face of the measuring contact (21) protrudes from the cone surface of the measuring block (20), and the measuring contact (21) can slide in the through hole. The internal structure includes a charging module (12), a power module (13), a microcontroller (14), a controller (15), a sensor (16), a sensor rod (17), a spring (18), and a pin (19). The sensor rod (17) includes two identical optical rods, both with beveled bottoms at a 45° angle. The two optical rods are placed side by side with their bevels facing outwards to form the sensor rod (17). The sensor rod (17) is placed inside the lower housing (8), and its upper end passes through a hollow double-headed stud (7). Afterwards, the two optical rods cooperate with the sensor (16) respectively. The lower end of the sensor rod (17) is inserted into the axial inner hole of the upper part of the measuring block (20). The inclined surfaces at the bottom of the two optical rods are respectively in contact with the inner end faces of the measuring contacts (21) on both sides, and the two optical rods can move up and down respectively. The sensor rod (17), the spring spring (18) and the pin (19) are used in combination. Specifically, the two optical rods of the sensor rod (17) are respectively provided with radial holes in the middle part. The two pins (19) are respectively inserted into the two holes and protrude from the optical rods. On the outer wall, two springs (18) are fixed between two pins (19) and a hollow double-ended stud (7) to provide a spring force for the light rod. In the initial state, the bottom end of the sensor rod (17) rests against the bottom of the axial inner hole of the measuring block (20). The charging module (12), power module (13), microcontroller (14), controller (15), and sensor (16) are all located inside the upper main housing (2). The sensor (16) acquires the displacement signals of the two light rods of the sensor rod (17). The data is transmitted to the microcontroller (14) to convert the data and display the angle value on the display screen (5). During qualitative measurement, if the measured angle does not meet the requirements, the microcontroller (14) sends an instruction to the buzzer (11) through the controller (15) to drive the buzzer (11) to complete the alarm action. The charging module (12) is connected to the charging port (1) and the power module (13). The power of the charging port (1) is transferred to the power module (13) through the charging module (12) to realize the storage of power.

2. The measuring device for the angle of aircraft nose cone sagging according to claim 1, characterized in that, The outer diameter of the guide post at the bottom of the measuring block (20) matches the inner diameter of the countersunk hole.

3. The measuring device for the angle of aircraft nose cone sagging according to claim 1, characterized in that, The lower rear cover (9) is fixedly connected to the opening of the lower housing (8) by tightening screws (10).

4. The measuring device for the angle of aircraft nose cone sagging according to claim 1, characterized in that, The sensor (16) is a high-precision pressure displacement sensor with a measurement accuracy of 0.01°.

5. A method for measuring the angle of the nose cone of an aircraft, characterized in that, The measurement method is based on a dedicated digital measuring tool for measuring the countersunk angle as described in any of claims 1-4, wherein the dedicated digital measuring tool includes an upper structure, a lower structure, and an internal structure; the measurement method includes quantitative measurement and qualitative measurement, and one or both are selected according to the measurement requirements, including the following steps: Step 1: Press the dedicated digital measuring tool switch button (4), select the quantitative measurement mode or the qualitative measurement mode, at which time the display screen (5) will light up and display the initial angle; Step 2: Move the measuring contact (21) and observe whether the measured angle value on the display screen (5) changes continuously. If it changes continuously, it means that this special digital measuring tool meets the requirements for continuous use. Click and press the record / reset button (6) and observe whether the angle on the display screen (5) remains unchanged. If it remains unchanged, it means that the recording function is intact. At this time, double-click and press the record / reset button (6) and observe whether the angle on the display screen (5) returns to the initial angle. If it returns to the initial angle, it meets the requirements for use and the reset function is intact. Step 3: Insert the special digital measuring tool into the countersunk hole to be measured, so that the lower guide post of the measuring block (20) is inserted into the countersunk hole until it can no longer be inserted. At this time, the measuring contacts (21) on both sides are in close contact with the countersunk hole. The countersunk hole pushes the measuring contacts (21) to move inward, which in turn pushes the two light rods of the sensor rod (17) to move upward respectively. The sensor (16) acquires the displacement of the two light rods respectively and generates a voltage signal to be transmitted to the controller (15). The controller (15) converts the voltage signal into an angle value and displays it on the display screen (5). Step 4: Keep the dedicated digital measuring tool vertical and stationary. During quantitative measurement, wait for the value displayed on the screen (5) to stabilize, then click the record / reset button (6). At this time, the recording function is activated, and the value displayed on the screen (5) is the countersunk angle reading. If both sides meet the range of 60±0.5°, it is a qualified countersunk. For unqualified countersunk, the deviation value is calculated by the angle value. During qualitative measurement, if the countersunk angle exceeds the tolerance, the microcontroller (14) controls the buzzer (11) to sound an alarm through the controller (15). If the buzzer (11) does not sound an alarm, the countersunk is qualified. After the measurement is completed, double-click the record / reset button (6) to reset. At this time, the reset function is activated, and the angle displayed on the screen (5) shows the initial angle. Repeat the measurement three times. Step 5: After all the measurements are completed, click the power button (4) to turn off the machine.

6. The method for measuring the angle of the aircraft nose cone according to claim 5, characterized in that, The dedicated digital measuring tool converts the lateral displacement of the measuring contact (21) into the vertical displacement of the sensor rod (17). Since the contact surface between the sensor rod (17) and the measuring contact (21) is at a 45° angle, the vertical displacement of the sensor rod (17) is equal to the lateral displacement of the measuring contact (21). The measured angles on both sides of the countersunk head are: θ 左 =arctan(H / (Lx) 左 )) and θ 右 =arctan(H / (Lx) 右 Where H is the vertical fixed dimension, L is the initial horizontal dimension, and x is the vertical dimension. 左 and x 右 These represent the vertical displacements of the two optical rods of the sensor rod (17).

7. The method for measuring the angle of the aircraft nose cone according to claim 5, characterized in that, The switch button (4) is a push-button switch. Pressing it once turns on the power and selects the quantitative measurement mode, and pressing it again turns off the power. Double-clicking it turns on the power and selects the qualitative measurement mode, and pressing it again turns off the power.

8. The method for measuring the angle of the aircraft nose cone according to claim 5, characterized in that, The charging port (1) adopts a type-c interface for universality.

9. The method for measuring the angle of the aircraft nose cone according to claim 5, characterized in that, The display screen (5) is a 1.3-inch OLED display screen.

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