Digital calibration device for countersunk head nest measuring tool

Abstract

The invention belongs to the technical field of digital calibration of countersunk nest measuring tools after nest making in the aviation product installation process, and particularly relates to a digital calibration device for a countersunk nest measuring tool, and the method and the device can achieve digital calibration of the countersunk nest measuring tools after nest making of aviation products. The quality of the measuring tool and the countersunk head nest is effectively improved, and high-quality and rapid delivery of products is ensured.

Description

Technical Field

[0001] This invention belongs to the field of digital calibration technology for countersunk head measuring tools after countersunk head measurement during the installation of aerospace products, and specifically relates to a digital calibration device for countersunk head measuring tools. Background Technology

[0002] In the aircraft manufacturing industry, ensuring the precise fit of every component is crucial. Countersunk recesses, as a critical part of the aircraft structure, require particularly strict quality control. Deviations in the size or angle of the countersunk recess not only affect the aircraft's appearance but also pose a potential threat to flight safety. During aircraft assembly, numerous countersunk recesses need to be drilled. If these recesses fail to meet established quality standards, standard components such as countersunk rivets and bolts will protrude from the skin surface, affecting the aerodynamic flatness of the aircraft. The quality of the countersunk recesses directly impacts the overall quality of aircraft assembly and has a significant influence on the aircraft's aerodynamic performance. Typically, countersunk recess angle measurement relies on specialized measuring tools. Due to the large number of countersunk recesses on an aircraft, frequent use of these measuring tools leads to wear and tear, which is detrimental to maintaining product quality. Therefore, accurate measurement and calibration of countersunk recesses is an indispensable part of the aircraft manufacturing process. While traditional calibration methods can provide some quality assurance, they are inefficient and susceptible to human error, leading to inconsistent measurement results.

[0003] Currently, the calibration of countersunk head measuring tools typically employs a manual calibration method using absolute measurement. This method involves directly reading all measurement values ​​from the countersunk head measuring tool using a measuring instrument, followed by manual angle calculation and judgment. However, this calibration method has limited accuracy and cannot guarantee 100% accurate calibration of the measuring tool. Summary of the Invention

[0004] The limitations of traditional methods have led to the development of the digital calibration device proposed in this invention. Therefore, to address the aforementioned problems, this invention proposes a digital calibration device for countersunk tool measuring instruments. This method is specifically designed for the calibration of countersunk tools. By integrating advanced sensor technology, the calibration device enables real-time monitoring and data acquisition of the countersunk tool, thereby achieving accurate assessment of tool wear. Data is recorded and analyzed in real-time through a digital processing system. Furthermore, the device integrates an automatic calibration system that automatically identifies the measuring tool based on sensor data, ensuring its calibration accuracy. Using this device significantly improves the calibration efficiency and accuracy of countersunk tools, thereby ensuring aircraft assembly quality and guaranteeing the accuracy of the aircraft's aerodynamic shape. This process not only improves calibration accuracy but also greatly enhances the efficiency of calibration work, reducing reliance on manual operation and ensuring that every step in the aircraft assembly process meets stringent quality standards.

[0005] Furthermore, the design of this digital calibration device also considers long-term durability and reliability. By reducing the frequent use of dedicated measuring tools, their service life can be effectively extended, reducing maintenance costs. Simultaneously, the device's automatic calibration function ensures that the countersunk measuring tool maintains optimal working condition under various operating environments, thus providing continuous and stable assurance for the aircraft's aerodynamic performance. In conclusion, the development and application of this digital calibration device is of great significance for improving the overall technical level and product quality of the aircraft manufacturing industry.

[0006] To address the problems existing in the prior art, the present invention provides a digital calibration device for countersunk angle measuring tools. This digital calibration device enables rapid and efficient calibration of countersunk angle measuring tools, avoiding detection failures caused by excessive wear of the countersunk angle measuring tools, which in turn affects the measurement results of the countersunk angle, leading to false positives and false negatives, and even affecting the high-quality and rapid delivery of aerospace products.

[0007] According to one aspect of this application, a digital calibration device for a countersunk head measuring tool is provided, comprising a mechanical structure, a calibration structure, and a sensing and control structure;

[0008] The mechanical structure consists of a main body 1, a top cover plate 2, connecting screws 3, an OLED display screen 4, hexagonal bolts 10, 120° recesses 11, 90° recesses 12, an HTTP port 13, an HDMI port 14, a connecting post 15, and a rubber sleeve 16.

[0009] The calibration structure consists of a switch button 5, an alarm 9, a left strain sensor ε117, a right strain sensor ε218, a strain signal conditioning module 19, and a data acquisition module 20.

[0010] The sensing control structure consists of a selection button 6, a record button 7, a reset button 8, a microcontroller 21, and a controller 22.

[0011] The main body 1 is the main load-bearing and protective component. The main body 1 is equipped with functional components such as OLED display screen 4, switch button 5, selection button 6, recording button 7, reset button 8 and alarm 9, which serve to support the functional components and protect the other electronic components inside. It can centrally protect and use electronic components and other components, and has a 120° recess 11 and a 90° recess 12 countersunk measuring recess.

[0012] The upper cover plate 2 is a connecting and protective component. The upper cover plate 2 is installed on the upper end of the main body 1. The upper cover plate 2 can protect the internal components from foreign objects, prevent foreign objects from entering the main body 1, and thus prevent damage to the internal components of the main body 1, thereby playing a protective role.

[0013] The connecting screw 3 is the main connecting and fastening component. The upper cover plate 2, data acquisition module 20, microcontroller 21, controller 22 and other components are installed on the upper end of the main body 1 through the connecting screw 3. The installation operation is simple and the connection is tight, making the installation more convenient, easy to disassemble and maintain, and improving maintenance efficiency.

[0014] The OLED display screen 4 is the core display component. The OLED display screen 4 is fixed to the upper surface of the main body 1 by a mechanical structure and is used to display data and pass / fail criteria, so that the test data can be displayed more intuitively and the problem of false or missed detections caused by data display problems can be avoided.

[0015] The hexagonal bolt 10 is the main fastening and connecting component. A connecting post 15 is installed at the bottom of the main body 1 through the hexagonal bolt 10, which allows the connecting post 15 to be easily and securely installed at the bottom of the main body 1, facilitating handheld operation.

[0016] The 120° recess 11 and 90° recess 12 are measurement units distributed on the main body 1. The left strain sensor ε117 and the right strain sensor ε218 are distributed on their upper surfaces, which serve as measurement functions.

[0017] The HTTP port 13 is a program auxiliary component. The HTTP port 13 is installed on the host body 1 and is used for program upgrades and data maintenance. The use of the HTTP port 13 plays a role in protecting the digital calibration device and data.

[0018] The HDMI port 14 is a display auxiliary component. The HDMI port 14 is installed on the main body 1. The HDMI port 14 can be directly connected to a digital display screen or a large-size computer display screen, and the display content of the OLED display screen 4 can be directly transmitted to the digital display screen or the large-size computer display screen through the HDMI port 14 to realize the extended display of display data.

[0019] The connecting column 15 is the main connecting component. The connecting column 15 is installed at the bottom of the main body 1 by hexagonal bolts 10, allowing the calibration personnel to grip the connecting column 15 for use. A rubber sleeve 16 is also fitted on it. The rubber sleeve 16 is an auxiliary operating component. It is attached to the connecting column 5 and increases the friction between the connecting column 15 and the hand, preventing slippage. Its shape adopts a biomimetic design, which can increase the comfort of the calibration personnel's hands and improve the reliability of their work.

[0020] The switch button 5 is an opening and closing component. The switch button 5 is installed on the main body 1. The switch button 5 is used to open and close the digital calibration device. The digital calibration device can be easily started and closed using the switch button 5, making the digital calibration of the countersunk head measuring tool more convenient.

[0021] The alarm 9 is an alarm component. When the voltage value is compared and is not in the qualified range (0.1V to 0.15V), it will flash red to warn, which serves as an alarm reminder and prevents the release of products with quality problems due to visual fatigue.

[0022] The left strain sensor ε117 and right strain sensor ε218 are the main working components. They can feedback the voltage magnitude through strain deformation, and convert the voltage magnitude into the gap size, thereby realizing the calibration function of the digital calibration device. The operation involves manually inputting the angle of the socket using the selection button 6. After receiving the instruction from the selection button 6, the microcontroller 21 issues a control instruction to the controller 22 according to the logic relationship. At this time, the tool to be calibrated is placed in, making contact with the left strain sensor ε117 and right strain sensor ε218 located inside the 120° socket 11 or 90° socket 12. The left strain sensor ε117 and right strain sensor ε218 then feed back the strain deformation voltage value through the strain signal conditioning module 19. This voltage value is then converted into the gap size, and the angle is used to... The angle is calculated using the formula; if the angle error exceeds 2°, it is considered unqualified.

[0023] in, From the overall perspective, α is the left angle, α is the right angle, ε1 is the left strain measured by the left strain sensor ε1(17), ε2 is the right strain measured by the right strain sensor ε2(18), L is the reference length, and H is the height.

[0024] The strain signal conditioning module 19 is a signal processing component. It is installed inside the main body 1 and can condition the strain signal, convert the strain deformation into voltage, and transmit the voltage signal to the data acquisition module 20 for subsequent data processing by the microcontroller 21 and the controller 22. The data acquisition module 20 is a signal acquisition component. It can acquire the sensing signals from the left strain sensor ε117 and the right strain sensor ε218 and send them to the strain signal conditioning module 19 to complete the conversion of the strain signal into a voltage signal.

[0025] The selection button 6 is a selection component. According to the calibration requirements, the selection button 6 can be used to select either 120° socket 11 or 90° socket 12 to complete the specific test selection.

[0026] The recording button 7 is a recording component. The recording button 7 is installed on the main body 1. When a non-conformity occurs, the non-conformity information is recorded using the recording button 7, which facilitates the collection of information on non-conforming countersunk measuring tools and makes it convenient for later traceability and viewing.

[0027] The reset button 8 is a reset component. The reset button 8 is installed on the main body 1. The reset button 8 can reset the value recording after the recording is completed or clear the alarm information of the alarm 9. The secondary recording of the reset button 8 provides accuracy guarantee for the digital calibration countersunk head measuring tool, which is conducive to improving the calibration accuracy.

[0028] The microcontroller 21 is a signal processing component. It is installed inside the main body 1. The microcontroller 21 receives voltage signals and issues control commands to the controller 22 according to logical relationships. The controller 22 issues control commands to the microcontroller 21. The controller 22 is a control component. The microcontroller 21 processes the voltage signals and issues control commands to the controller 22 according to logical relationships. The controller 22 completes the warning issuance to the alarm 9.

[0029] The specific working process is implemented through the following steps: The microcontroller is controlled by control signals. First, the specifications and angles of the countersunk head measuring tool to be calibrated are selected using the selection buttons according to requirements. The microcontroller then instructs the controller to issue corresponding control commands. Different control commands control different actions. A switch command controls the activation of the calibration device. The left and right strain sensors generate corresponding analog signals, which are acquired by the data acquisition module and transmitted to the strain signal conditioning module. The strain signal conditioning module converts the model signals into digital signals, which are then transmitted to the microcontroller according to the attached instructions. Figure 6 Further angle conversion is performed, and a conclusion on whether it is qualified or not is made based on the conversion result. The controller is then issued a display command, and the display screen shows the specific calibration value and conclusion. When a failure occurs, the controller controls the alarm to convey a warning signal. After a calibration is completed, the recording signal can record the calibration result of the current calibration. The reset signal can be used to apply control operation to the microcontroller to reset the previous calibration to zero, so that the calibration work can be carried out again. This realizes the digital calibration of the countersunk head measuring tool.

[0030] The advantages of this application are:

[0031] Through in-depth research and analysis of currently widely used measurement methods and tools, we have discovered several insurmountable challenges in the calibration process of countersunk ball measuring tools. The calibration process for these tools is typically complex and difficult, heavily reliant on the operator's subjective judgment and skill level. Due to the significant impact of operational subjectivity and methodological diversity on calibration results, achieving digital calibration of countersunk ball measuring tools becomes extremely difficult. These problems not only severely affect the reliability of calibration results but also negatively impact calibration efficiency and accuracy.

[0032] To address the aforementioned challenges, this invention proposes an innovative method for digitally calibrating countersunk head measuring tools. This method aims to improve the accuracy and reliability of measurement results. This invention overcomes many shortcomings of traditional manual calibration methods by creatively designing a system that efficiently processes sampled data through strain sensors, a microcontroller, and a controller. The strain sensor accurately measures the distance by observing the voltage values ​​fed back through its deformation feedback gap. Precise calculations are performed using a preset angle calculation formula, and the results are directly displayed on the screen, thus completely avoiding the deficiencies of traditional manual calibration calculations, significantly improving calibration accuracy, and effectively preventing data errors and inaccuracies through precise display. The invention cleverly utilizes strain sensors to digitally calibrate countersunk head measuring tools through deformation feedback gap size, which not only significantly improves calibration accuracy but also greatly enhances calibration efficiency.

[0033] The present invention features a simple design, is easy to operate and carry, and significantly improves the accuracy and efficiency of countersunk head measuring tools after use. Utilizing digital calibration of countersunk head measuring tools not only improves calibration accuracy but also saves a significant amount of labor, thus conserving labor costs and time and greatly increasing calibration efficiency. Furthermore, the implementation of this invention offers advantages such as ease of maintenance and upgrades, making the calibration of countersunk head measuring tools more standardized and regulated, providing a highly efficient, accurate, and economical calibration solution for related industries. Attached Figure Description

[0034] Figure 1 This is a flowchart illustrating the working process of a digital calibration device for countersunk head measuring tools.

[0035] Figure 2 An isometric view of a digital calibration device for a countersunk head measuring tool;

[0036] Figure 3 A front view of a digital calibration device for countersunk head measuring tools;

[0037] Figure 4 A top view of a digital calibration device for a countersunk head measuring tool;

[0038] Figure 5 Left view of a digital calibration device for countersunk head measuring tools;

[0039] Figure 6 This is a schematic diagram of angle conversion for a digital calibration device used in countersunk head measuring tools.

[0040] The components include: 1. Main body; 2. Top cover plate; 3. Connecting screws; 4. OLED display screen; 5. Switch button; 6. Selection button; 7. Record button; 8. Reset button; 9. Alarm; 10. Hex bolt; 11. 120° recess; 12. 90° recess; 13. HTTP port; 14. HDMI port; 15. Connecting post; 16. Rubber sleeve; 17. Left strain sensor ε1; 18. Right strain sensor ε2; 19. Strain signal conditioning module; 20. Data acquisition module; 21. Microcontroller; 22. Controller. Detailed Implementation

[0041] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0042] Example 1

[0043] A digital calibration device for countersunk corner measuring tools is provided. This digital calibration device enables rapid and efficient calibration of countersunk corner measuring tools, avoiding detection failure caused by excessive wear of the countersunk corner measuring tools, which in turn affects the measurement results of the countersunk corner angle, causing false positives and false negatives, and even affecting the high-quality and rapid delivery of aerospace products.

[0044] According to one aspect of this application, a digital calibration device for a countersunk head measuring tool is provided, comprising a mechanical structure, a calibration structure, and a sensing and control structure;

[0045] The mechanical structure consists of a main body 1, a top cover plate 2, connecting screws 3, an OLED display screen 4, hexagonal bolts 10, 120° recesses 11, 90° recesses 12, an HTTP port 13, an HDMI port 14, a connecting post 15, and a rubber sleeve 16.

[0046] The calibration structure consists of a switch button 5, an alarm 9, a left strain sensor ε117, a right strain sensor ε218, a strain signal conditioning module 19, and a data acquisition module 20.

[0047] The sensing control structure consists of a selection button 6, a record button 7, a reset button 8, a microcontroller 21, and a controller 22.

[0048] The main body 1 is the main load-bearing and protective component. The main body 1 is equipped with functional components such as OLED display screen 4, switch button 5, selection button 6, recording button 7, reset button 8 and alarm 9, which serve to support the functional components and protect the other electronic components inside. It can centrally protect and use electronic components and other components, and has a 120° recess 11 and a 90° recess 12 countersunk measuring recess.

[0049] The upper cover plate 2 is a connecting and protective component. The upper cover plate 2 is installed on the upper end of the main body 1. The upper cover plate 2 can protect the internal components from foreign objects, prevent foreign objects from entering the main body 1, and thus prevent damage to the internal components of the main body 1, thereby playing a protective role.

[0050] The connecting screw 3 is the main connecting and fastening component. The upper cover plate 2, data acquisition module 20, microcontroller 21, controller 22 and other components are installed on the upper end of the main body 1 through the connecting screw 3. The installation operation is simple and the connection is tight, making the installation more convenient, easy to disassemble and maintain, and improving maintenance efficiency.

[0051] The OLED display screen 4 is the core display component. The OLED display screen 4 is fixed to the upper surface of the main body 1 by a mechanical structure and is used to display data and pass / fail criteria, so that the test data can be displayed more intuitively and the problem of false or missed detections caused by data display problems can be avoided.

[0052] The hexagonal bolt 10 is the main fastening and connecting component. A connecting post 15 is installed at the bottom of the main body 1 through the hexagonal bolt 10, which allows the connecting post 15 to be easily and securely installed at the bottom of the main body 1, facilitating handheld operation.

[0053] The 120° recess 11 and 90° recess 12 are measurement units distributed on the main body 1. The left strain sensor ε117 and the right strain sensor ε218 are distributed on their upper surfaces, which serve as measurement functions.

[0054] The HTTP port 13 is a program auxiliary component. The HTTP port 13 is installed on the host body 1 and is used for program upgrades and data maintenance. The use of the HTTP port 13 plays a role in protecting the digital calibration device and data.

[0055] The HDMI port 14 is a display auxiliary component. The HDMI port 14 is installed on the main body 1. The HDMI port 14 can be directly connected to a digital display screen or a large-size computer display screen, and the display content of the OLED display screen 4 can be directly transmitted to the digital display screen or the large-size computer display screen through the HDMI port 14 to realize the extended display of display data.

[0056] The connecting column 15 is the main connecting component. The connecting column 15 is installed at the bottom of the main body 1 by hexagonal bolts 10, allowing the calibration personnel to grip the connecting column 15 for use. A rubber sleeve 16 is also fitted on it. The rubber sleeve 16 is an auxiliary operating component. It is attached to the connecting column 5 and increases the friction between the connecting column 15 and the hand, preventing slippage. Its shape adopts a biomimetic design, which can increase the comfort of the calibration personnel's hands and improve the reliability of their work.

[0057] The switch button 5 is an opening and closing component. The switch button 5 is installed on the main body 1. The switch button 5 is used to open and close the digital calibration device. The digital calibration device can be easily started and closed using the switch button 5, making the digital calibration of the countersunk head measuring tool more convenient.

[0058] The alarm 9 is an alarm component. When the voltage value is compared and is not in the qualified range (0.1V to 0.15V), it will flash red to warn, which serves as an alarm reminder and prevents the release of products with quality problems due to visual fatigue.

[0059] The left strain sensor ε117 and right strain sensor ε218 are the main working components. They can feedback the voltage magnitude through strain deformation, and convert the voltage magnitude into the gap size, thereby realizing the calibration function of the digital calibration device. The operation involves manually inputting the angle of the socket using the selection button 6. After receiving the instruction from the selection button 6, the microcontroller 21 issues a control instruction to the controller 22 according to the logic relationship. At this time, the tool to be calibrated is placed in, making contact with the left strain sensor ε117 and right strain sensor ε218 located inside the 120° socket 11 or 90° socket 12. The left strain sensor ε117 and right strain sensor ε218 then feed back the strain deformation voltage value through the strain signal conditioning module 19. This voltage value is then converted into the gap size, and the angle is used to...

[0060] The angle is calculated using the formula; if the angle error exceeds 2°, it is considered unqualified.

[0061] in, From the overall perspective, α is the left angle, α is the right angle, ε1 is the left strain measured by the left strain sensor ε1(17), ε2 is the right strain measured by the right strain sensor ε2(18), L is the reference length, and H is the height.

[0062] The strain signal conditioning module 19 is a signal processing component. It is installed inside the main body 1 and can condition the strain signal, convert the strain deformation into voltage, and transmit the voltage signal to the data acquisition module 20 for subsequent data processing by the microcontroller 21 and the controller 22. The data acquisition module 20 is a signal acquisition component. It can acquire the sensing signals from the left strain sensor ε117 and the right strain sensor ε218 and send them to the strain signal conditioning module 19 to complete the conversion of the strain signal into a voltage signal.

[0063] The selection button 6 is a selection component. According to the calibration requirements, the selection button 6 can be used to select either 120° socket 11 or 90° socket 12 to complete the specific test selection.

[0064] The recording button 7 is a recording component. The recording button 7 is installed on the main body 1. When a non-conformity occurs, the non-conformity information is recorded using the recording button 7, which facilitates the collection of information on non-conforming countersunk measuring tools and makes it convenient for later traceability and viewing.

[0065] The reset button 8 is a reset component. The reset button 8 is installed on the main body 1. The reset button 8 can reset the value recording after the recording is completed or clear the alarm information of the alarm 9. The secondary recording of the reset button 8 provides accuracy guarantee for the digital calibration countersunk head measuring tool, which is conducive to improving the calibration accuracy.

[0066] The microcontroller 21 is a signal processing component. It is installed inside the main body 1. The microcontroller 21 receives voltage signals and issues control commands to the controller 22 according to logical relationships. The controller 22 issues control commands to the microcontroller 21. The controller 22 is a control component. The microcontroller 21 processes the voltage signals and issues control commands to the controller 22 according to logical relationships. The controller 22 completes the warning issuance to the alarm 9.

[0067] The specific work process is as follows:

[0068] Step 1: Before use, inspect the calibration device for appearance and conformity labels. Check whether the calibration device has complete calibration labels and whether the appearance is intact. If it is complete and intact, proceed to the next step.

[0069] Step 2: Press the power button 5 to turn on the digital calibration device, check the continuity of the calibration device circuit, and ensure that the calibration device is functioning properly.

[0070] Step 3: Based on the size and diameter of the countersunk head angle to be calibrated, manually adjust the digital calibration device's calibration angle (120° countersunk or 90° countersunk) and diameter using selection button 6 to achieve the selection function;

[0071] Step 4: Place the countersunk head measuring tool to be calibrated into the 120° countersunk head 11 or the 90° countersunk head 12, observe the data displayed on the OLED display screen 4 and the pass / fail judgment status, and then press the record button 7 to record the results for easy follow-up review later;

[0072] Step 5: When the OLED display 4 shows a pass / fail judgment and the countersunk head measuring tool fails, the alarm 9 will emit a flashing red light as a warning;

[0073] Step 6: Press the reset button 8 to clear the alarm message of the alarm 9, and repeat step 4 to retest to increase the reliability of the calibration;

[0074] Step 7: After calibrating the countersunk head measuring tools in sequence, press the power button 5 to turn off the power to the entire calibration device, and put the calibration device back in its original position to complete the calibration and verification work.

[0075] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions made by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A digital calibration device for a countersunk head measuring tool, characterized in that, It consists of a mechanical structure, a calibration structure, and a sensing and control structure; The mechanical structure consists of a main body (1), a top cover (2), connecting screws (3), an OLED display screen (4), hexagonal bolts (10), 120° recesses (11), 90° recesses (12), an HTTP port (13), an HDMI port (14), a connecting post (15), and a rubber sleeve (16). The calibration structure consists of a switch button (5), an alarm (9), a left strain sensor ε1 (17), a right strain sensor ε2 (18), a strain signal conditioning module (19), and a data acquisition module (20); The sensing control structure consists of a selection button (6), a record button (7), a reset button (8), a microcontroller (21), and a controller (22).

2. The digital calibration device for countersunk head measuring tools according to claim 1, characterized in that, The main body (1) is the main load-bearing and protective component. The main body (1) is equipped with OLED display screen (4), switch button (5), selection button (6), recording button (7), reset button (8) and alarm (9) and other functional components, which serve as load-bearing components and protect the other electronic components inside. It can centrally protect and use electronic components and other components, and has 120° recess (11) and 90° recess (12) countersunk measuring recesses on it. The upper cover plate (2) is a connecting protection and protection component. The upper cover plate (2) is installed on the upper end of the main body (1). The upper cover plate (2) can protect the components inside it from foreign objects, prevent foreign objects from entering the main body (1), and thus prevent damage to the internal components of the main body (1), playing a protective and protective role. The connecting screw (3) is the main connecting and fastening component. The upper cover plate (2), data acquisition module (20), microcontroller (21), controller (22) and other components are installed on the upper end of the main body (1) by the connecting screw (3). The installation operation is simple and the connection is tight, making it more convenient to install, easy to disassemble and maintain, and improving maintenance efficiency.

3. The digital calibration device for countersunk head measuring tools according to claim 2, characterized in that, The OLED display screen (4) is the core display component. The OLED display screen (4) is fixed on the upper surface of the main body (1) by mechanical structure and is used to display data and qualification criteria, so that the test data can be displayed more intuitively and the problem of false detection or omission caused by data display problems can be avoided.

4. The digital calibration device for countersunk head measuring tools according to claim 3, characterized in that, The hexagonal bolt (10) is the main fastening and connecting component. A connecting column (15) is installed at the bottom of the main body (1) through the hexagonal bolt (10), which allows the connecting column (15) to be conveniently fastened at the bottom of the main body (1), making it easy to perform handheld operation. The 120° socket (11) and 90° socket (12) are measurement units distributed on the main body (1). The left strain sensor ε1 (17) and the right strain sensor ε2 (18) are distributed on their upper surfaces, which play a measurement function.

5. The digital calibration device for a countersunk head measuring tool according to claim 4, characterized in that, The HTTP port (13) is a program auxiliary component. The HTTP port (13) is installed on the host body (1) and is used for program upgrades and data maintenance. The use of the HTTP port (13) plays a role in protecting the digital calibration device and data. The HDMI port (14) is a display auxiliary component. The HDMI port (14) is installed on the host body (1). The HDMI port (14) can be directly connected to a digital display screen or a large-size computer screen. The display content of the OLED display screen (4) is directly transmitted to the digital display screen or the large-size computer screen through the HDMI port (14) to realize the extended display of display data.

6. The digital calibration device for a countersunk head measuring tool according to claim 5, characterized in that, The connecting column (15) is the main connecting component. The connecting column (15) is installed at the bottom of the main body (1) by a hexagonal bolt (10), which allows the calibration personnel to grasp the connecting column (15) for use. It is covered with a rubber sleeve (16). The rubber sleeve (16) is an auxiliary operating component. The rubber sleeve (16) is attached to the connecting column 5. The rubber sleeve (16) can increase the friction between the connecting column (15) and the hand, so that it will not slip. In addition, its shape adopts a biomimetic design, which can increase the comfort of the calibration personnel's hands and improve the reliability of the personnel's work.

7. The digital calibration device for a countersunk head measuring tool according to claim 6, characterized in that, The switch button (5) is an opening and closing component. The switch button (5) is installed on the main body (1). The switch button (5) is used to open and close the digital calibration device. The digital calibration device can be easily started and closed using the switch button (5), making it more convenient to calibrate the countersunk head measuring tool. The alarm (9) is an alarm component. When the voltage value is compared and is not in the qualified range, it will flash red to warn and serve as an alarm reminder to prevent visual fatigue from causing quality problems to be released.

8. The digital calibration device for a countersunk head measuring tool according to claim 7, characterized in that, The left strain sensor ε1 (17) and right strain sensor ε2 (18) are the main working components. They can feed back the voltage magnitude through the strain deformation. The voltage magnitude is equivalent to the gap size, thereby realizing the calibration function of the digital calibration device. The usage process is to manually input the angle of the socket using the selection button (6). After receiving the instruction input by the selection button (6), the microcontroller (21) issues a control instruction to the controller (22) according to the logic relationship. At this time, the tool to be calibrated is placed in so that it comes into contact with the left strain sensor ε1 (17) and right strain sensor ε2 (18) set inside the 120° socket (11) or 90° socket (12). At this time, the left strain sensor ε1 (17) and right strain sensor ε2 (18) feed back the strain deformation voltage value through the strain signal conditioning module (19). The specific feedback voltage value is converted into the gap size and the angle is used. The angle is calculated using the formula; if the angle error exceeds 2°, it is considered unqualified. in, From the overall perspective, α is the angle on the left, α is the angle on the right, and ε1 is the angle of the left strain sensor ε1. (17) The measured strain on the left side, ε2 is the strain of the right strain sensor ε2 (18) The measured strain on the right side, L is the reference length, H is the height; The strain signal conditioning module (19) is a signal processing component. It is installed inside the main body (1). The strain signal conditioning module (19) can condition the strain signal, convert the strain deformation into voltage, and transmit the voltage signal to the data acquisition module (20) for subsequent processing by the microcontroller (21) and controller (22). The data acquisition module (20) is a signal acquisition component. It can connect the left strain sensor ε1 (17) and the right strain sensor ε2. (18) The sensor signal is collected and sent to the strain signal conditioning module (19) to complete the conversion of the strain signal into a voltage signal.

9. The digital calibration device for a countersunk head measuring tool according to claim 8, characterized in that, The selection button (6) is a selection component. According to the calibration requirements, the selection button (6) can be used to select either 120° socket (11) or 90° socket (12) to complete the specific test selection. The recording button (7) is a recording component. The recording button (7) is installed on the main body (1). When a non-conformity occurs, the recording button (7) is used to record the non-conformity information, which facilitates the collection of information on non-conformity countersunk measuring tools and facilitates later traceability and viewing. The reset button (8) is a reset component. The reset button (8) is installed on the main body (1). The reset button (8) can reset the value recording after the recording is completed or clear the alarm information of the alarm (9) by using the reset button (8). The secondary recording of the reset button (8) provides accuracy guarantee for the digital calibration countersunk head measuring tool, which is conducive to improving the calibration accuracy.

10. The digital calibration device for a countersunk head measuring tool according to claim 9, characterized in that, The microcontroller (21) is a signal processing component. The microcontroller (21) is installed inside the main body (1). The microcontroller (21) receives the voltage signal and issues control commands to the controller (22) according to the logical relationship. The controller (22) issues control commands to the microcontroller (21). The controller (22) is a control component. The microcontroller (21) processes the voltage signal and issues control commands to the controller (22) according to the logical relationship. The controller (22) completes the warning issuance to the alarm (9).

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