A portable in-vitro aperture sizing device

Abstract

The utility model belongs to the technical field of machining and assembly control, specifically relates to a portable aperture extracorporeal action size measuring device, measuring device includes measuring head module, control module, user interaction module, operating button, energy supply module, this portable aperture extracorporeal action size measuring device measures the actual size and geometric error of aperture inner wall through measuring module, and control module controls the movement and positioning of measuring head module to obtain accurate measurement result, through the program automatic control of user interaction module, the action of mechanism in control module and least square algorithm processing measurement data are handled to obtain accurate measurement result, and operating button controls the operating state of measuring device, and through energy supply module, the measuring device can be used continuously under the mobile environment, the utility model measures the actual size and geometric error of aperture through direct contact and laser scanning combination, and through mechanical and intelligent combination control the movement and positioning of measuring head module, then accurate measurement result is obtained after algorithm processing, and adopts lithium cell to store electricity for the device, has the advantages such as accurate measurement, portable, can be used continuously under different measurement environment.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical processing and assembly control technology, specifically relating to a portable external aperture measuring device. Background Technology

[0002] With the rapid development of the manufacturing industry, the requirements for the produced parts are getting higher and higher, and the requirements for the aperture of the parts are becoming more and more stringent. This is mainly reflected in the stricter requirements for the key dimensions of the aperture, especially the increasingly stringent requirements for the external functional dimensions of the aperture.

[0003] The external functional size of the aperture is the limit boundary size formed by the combined effect of the actual size and geometric tolerances. It is the minimum virtual aperture that ensures the smooth insertion of the mating shaft. The actual size is the actual size formed by the part during the manufacturing process. It may deviate from the ideal size defined at the time of design due to machining errors, deformation or measurement errors. That is, the specific size obtained by measurement after the part is machined. Geometric tolerances are mainly reflected in form tolerances, position tolerances or orientation tolerances, such as roundness, cylindricity, position, coaxiality, perpendicularity, etc.

[0004] Currently, the conventional methods used in China to measure the external dimensions of bore diameter mainly include the GO gauge method, coordinate measuring machine (CMM), inside micrometer, and plug gauge. These methods have many problems: 1. The GO gauge method requires customized fixtures, which is costly; 2. The CMM has high accuracy and is suitable for complex geometric tolerances, but the equipment is expensive, complex to operate, occupies a large space, and is not easy to move; 3. Inside micrometers and plug gauges cannot directly measure the influence of geometric tolerances. Summary of the Invention

[0005] To overcome the shortcomings of current external aperture measurement devices, this application provides a portable external aperture measurement device to adapt to the measurement of external aperture dimensions in different measurement scenarios. This device addresses issues such as high equipment cost, complex operation and difficulty in portability, and high requirements for the testing environment, thereby reducing production costs, enabling portable operation, reducing labor intensity, and improving product testing efficiency.

[0006] To achieve the above objectives, this application provides a portable external aperture size measuring device, which is used to measure the external aperture size under different measurement environments. The portable external aperture size measuring device includes a probe module, a control module, a user interaction module, operation buttons, and a power supply module.

[0007] The probe module is used to obtain the actual size and geometric tolerance of the aperture, and then to obtain the external functional size of the aperture.

[0008] The control module is used to control the extension and retraction of the probe module, so that the probe module can achieve precise positioning and obtain accurate measurement results.

[0009] The user interaction module reduces human error by controlling the movement of the mechanism through a program, and processes the measurement data of the probe module through an algorithm and displays it in an intuitive and easy-to-understand way.

[0010] The operation buttons are used to control the device to turn on and off, and also to control all mechanisms that generate motion to return to their original positions.

[0011] The power supply module is used to charge and store electricity for the device, enabling the device to be used continuously under different measurement environments.

[0012] The probe module includes a contact probe and a non-contact laser sensor.

[0013] The contactable probe consists of three spherical probes coated with tungsten carbide DLC, which are evenly distributed at 120° intervals along the circumference of the device head and fixedly installed at one end of the control module. The actual dimensions of the aperture at multiple points are obtained by directly contacting the inner wall of the aperture.

[0014] The non-contact laser sensor consists of three arc-shaped laser sensors embedded in the device housing and equidistantly distributed at 120° intervals around the contactable probe. A sapphire glass protective layer is provided on its surface to avoid contact errors. This allows for the acquisition of geometric errors at multiple angles of the aperture during measurement, ultimately providing a more comprehensive coverage of the geometry of the inner wall of the aperture.

[0015] The control module includes a mechanical control module and an intelligent control module.

[0016] The mechanical control module includes a guide rod, a spring, a first guide rail, a conjugate cam, a drive shaft, and a micro stepper motor. The guide rod and spring are installed inside the first guide rail, which is installed radially along the device. The contactable probe is fixedly installed at both ends of the guide rod with the spring. The first guide rail and the guide rod are connected by the spring. The micro stepper motor, drive shaft, and conjugate cam are installed axially along the device. The first guide rail and the conjugate cam are connected by rollers to convert rotational motion into linear motion. The micro stepper motor transmits power through the drive shaft to drive the conjugate cam to rotate, thereby driving the contactable probe to move radially along the device, realizing the telescopic positioning of the contactable probe.

[0017] The intelligent control module includes a displacement sensor, a pressure sensor, an electromagnetic locking assembly, and a latch. The displacement sensor is used to record the displacement of the accessible probe, the pressure sensor is used to detect whether the spring is under pressure, the electromagnetic locking assembly is used to reset the accessible probe, and the latch is used to close the first guide rail after the accessible probe is reset.

[0018] The displacement sensor is installed at the top of the guide rod and is used to record the displacement of the contactable probe, thereby obtaining the actual size of the aperture.

[0019] The pressure sensor is installed at the bottom of the first guide rail and is used to detect whether the spring is under pressure. When the pressure reaches a certain value, it transmits an energizing signal to the user interaction module to prevent damage to the contactable probe.

[0020] The electromagnetic locking assembly consists of two parts: an electromagnet and a magnetic ring. The electromagnet is installed between the pressure sensor and the first guide rail, and the magnetic ring is installed at the bottom of the guide rod. The magnetic force generated is equal to the initial spring force. When the pressure sensor detects that the spring is under pressure, it transmits an energizing signal to the electromagnetic locking assembly. At this time, the electromagnetic locking assembly is energized and generates magnetic force, which causes the guide rod to drive the contactable probe to reset.

[0021] The buckle is installed on the top of the first guide rail and is used to close the first guide rail after the accessible probe is reset. The buckle is also covered with anti-collision sponge to prevent the accessible probe from being contaminated or damaged.

[0022] The user interaction module includes a data processor and a display screen. The data processor is equipped with a micro stepper motor reset program and an automatic calibration program, which allows the contactable probe to reset after measurement and perform automatic calibration before measurement to make the measurement results more accurate. The data processor can process the measurement values ​​of the displacement sensor and the non-contact laser sensor through a least squares algorithm and display them on the display screen in the form of maximum physical size, actual size, and minimum physical size, making the measurement results simple and easy to understand. The display screen can perform human-computer interaction, making the device operation intelligent.

[0023] The operation buttons include a reset button and a power switch, which are used to restore all mechanisms that move during the measurement process to their original positions, and also to turn the measuring device on and off.

[0024] The power supply module includes a lithium battery and a charging port. The lithium battery is replaceable and is used for charging and storing electricity in the device, enabling the device to be used continuously in different measurement environments.

[0025] Compared with the prior art, the beneficial effects of this application are:

[0026] This application provides a measuring device for the external working dimension of aperture suitable for different measurement environments, including a probe module, a control module, a user interaction module, operation buttons, and a power supply module. The probe module includes a contactable probe and a non-contact laser sensor for measuring the actual size and geometric error of the aperture. The control module includes a mechanical control module and an intelligent control module for positioning, moving, and resetting the contactable probe. The spring force drives the guide rod and the contactable probe at its end to extend and retract until the contactable probe contacts the inner wall of the aperture being measured. If the spring force is released and the contactable probe still has not contacted the inner wall of the aperture, the data processor program starts a micro stepper motor, which transmits power through a drive shaft to rotate a conjugate cam, allowing the contactable probe to continue extending outward. When the contactable probe contacts the inner wall of the aperture, a pressure sensor detects pressure on the spring and transmits an energizing signal to the electromagnetic locking group, which generates a magnetic field. The force drives the contactable probe to reset. When the displacement sensor's displacement is zero, the contactable probe reset is complete. At this point, the electromagnetic locking group generates a magnetic force equal to the spring force and closes the latch to prevent contamination or damage to the contactable probe, thus completing one measurement. After one measurement, shaking the handle up and down continues to take two more measurements. The data processor takes the minimum value from the three measurement data and processes it using a least squares algorithm to obtain the external effective size of the aperture. The user interaction module includes a data processor and a display screen for processing and displaying the measurement data from the contactable probe and the non-contact laser sensor. The display screen enables human-machine interaction and is also used to automatically control the movement of some mechanisms. The operation buttons include a reset button and a power switch, used to restore all moving mechanisms to their original positions after the measurement is completed. The power switch is used to turn the device on and off. The power supply section includes a charging port and a battery for charging and storing electricity, enabling the device to be used continuously in different measurement environments. Attached Figure Description

[0027] Figure 1 The diagram shows a front view of the overall structure of a portable external aperture measurement device provided in an embodiment of this application.

[0028] Figure 2 It shows Figure 1 The image shows a left view of the overall structure of a portable external aperture measurement device.

[0029] Figure 3 It shows Figure 1 A partial cross-sectional view of a portable external aperture measurement device is provided.

[0030] Figure 4 It shows Figure 3 Schematic diagram of the AA-direction structure.

[0031] Figure 5It shows Figure 4 Enlarged view of section B in the middle.

[0032] Figure 6 It shows Figure 2 A schematic diagram of the conjugate cam.

[0033] Figure 7 It shows Figure 2 A schematic diagram of the drive shaft.

[0034] Explanation of key component symbols:

[0035] 1-Housing; 2-Handle; 3-Contact probe; 4-Non-contact laser sensor; 5-Guide rod; 6-Spring; 7-First guide rail; 8-Conjugate cam; 9-Drive shaft; 10-Miniature stepper motor; 11-Displacement sensor; 12-Snap-on; 13-Magnetic ring; 14-Electromagnet; 15-Pressure sensor; 16-Data processor; 17-Display screen; 18-Power switch; 19-Reset button; 20-Lithium battery; 21-Charging port. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] In the description of this utility model, it should be understood that the terms "center", "radial", "axial", "circumferential", "upper", "lower", "front", "middle", "rear", "inner", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "group" means two or more, unless otherwise explicitly specified.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] Please see Figure 1 , Figure 2 , Figure 3 This embodiment provides a portable external aperture measurement device, comprising a housing 1, a handle 2, a probe module, a control module, a user interaction module, operation buttons, and a power supply module. The device is divided into front and rear ends; the front end is the housing 1, and the rear end is the handle 2 with a fingerprint-resistant anti-slip design. The axial centerlines of the housing 1 and the handle 2 coincide. The probe module and control module are mounted on the front end of the housing 1. The user interaction module, operation buttons, and power supply module are distributed axially from left to right on the handle 2.

[0041] Please refer to the following: Figure 1 , Figure 2 , Figure 3 The probe module includes a contactable probe 3 and a non-contact laser sensor 4, both mounted on the front end of the housing 1. The contactable probe 3 consists of three spherical probes coated with tungsten carbide and DLC. Each contactable probe 3 is evenly distributed around the circumference of the housing 1 at 120° intervals and is fixed to the control module. The non-contact laser sensor 4 consists of three arc-shaped laser sensors. An arc-shaped base is provided on the housing 1. Each non-contact laser sensor 4 is embedded in the arc-shaped base of the housing 1 at 120° intervals, and its outer layer is protected by arc-shaped sapphire glass to prevent damage or contamination to the non-contact laser sensor 4. Each contactable probe 3 and non-contact laser sensor 4 is 60° out of phase.

[0042] In this embodiment, the contact probe 3 can directly contact the inner wall of the measured aperture to measure the actual size of the aperture. The non-contact laser sensor 4 scans the geometry of the inner wall of the aperture with a laser to measure the geometric error of the aperture. By combining direct contact and laser scanning, the geometry of the inner wall of the aperture can be covered globally to the greatest extent, so as to obtain the accurate external working size of the aperture.

[0043] Please see Figure 1 , Figure 2 , Figure 3 The control module is located inside the outer casing 1 of the device, and the control module includes a mechanical control module and an intelligent control module.

[0044] Please refer to the following: Figure 1 , Figure 2 , Figure 3 , Figure 4 The mechanical control module is located inside the accessible probe 3. The mechanical control module includes a guide rod 5, a spring 6, a first guide rail 7, a conjugate cam 8, a drive shaft 9, and a micro stepper motor 10. The guide rod 5, spring 6, first guide rail 7, and conjugate cam 8 are connected in sequence from the outside to the inside along the radial direction of the front end of the device housing 1. The conjugate cam 8 is connected to the drive shaft 9, and the drive shaft 9 is connected to the micro stepper motor 10. The conjugate cam 8, drive shaft 9, and micro stepper motor 10 are distributed along the axial center line of the device, and their geometric centers are all collinear with the axial center line of the front end of the device housing 1.

[0045] Please refer to the following: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 The contactable probe 3 is fixed to the top of the guide rod 5. The spring 6 connects the guide rod 5 to the inside of the first guide rail 7. The first guide rail 7 is connected to the conjugate cam 8 by rollers. The conjugate cam 8 consists of three disc cams. Its geometric center, the geometric center of the drive shaft 9, and the geometric center of the micro stepper motor 10 are all located on the geometric center line of the front end of the device housing 1. The conjugate cam 8 is connected to the drive shaft 9 by inclined wedges. The guide rod 5, the spring 6, and the first guide rail 7 are equivalent to the roller followers of the conjugate cam 8, which can convert the rotational motion of the micro stepper motor 10 into the linear motion of the first guide rail 7. The device housing 1 is provided with a guide rail along the radial direction for the first guide rail 7 to move along the radial direction of the device. The micro stepper motor 10 transmits power to the conjugate cam 8 through the drive shaft 9. The conjugate cam 8 drives the first guide rail 7 to move along the radial direction of the device housing 1, thereby realizing the radial movement of the contactable probe 3 along the device housing 1.

[0046] In this embodiment, the guide rod 5 is used to support the movement of the contactable probe 3, the spring 6 supports the movement of the guide rod 5 by its own elasticity, the first guide rail 7 is used to control the guide rod 5 to move in a straight line, and the micro stepper motor 10 transmits power to the conjugate cam 8 through the drive shaft 9, thereby driving the conjugate cam 8 to rotate, and thus controlling the contactable probe 3 to move radially along the device.

[0047] Please refer to the following: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5The intelligent control module is located on the mechanical control module. The intelligent control module includes a displacement sensor 11, a buckle 12, an electromagnetic locking assembly, and a pressure sensor 15. The displacement sensor 11 is installed on the top of the guide rod 5, the buckle 12 is installed on the top of the first guide rail 7, the electromagnetic locking assembly is installed on the guide rod 5 and the first guide rail 7, and the pressure sensor 15 is installed on the bottom of the first guide rail 7.

[0048] In this embodiment, the displacement sensor 11 is used to record the displacement of the accessible probe 3; the latch 12 is used to control the opening and closing of the first guide rail 7, and the inner side of the latch 12 is provided with anti-collision sponge to prevent the accessible probe 3 from being contaminated or damaged; in particular, the electromagnetic locking assembly includes a magnetic ring 13 and an electromagnet 14. The magnetic ring 13 is located at the bottom of the guide rod 5, and the electromagnet 14 is located between the pressure sensor 15 and the first guide rail 7. By energizing, a magnetic force is generated to reset the guide rod 5, thereby enabling the accessible probe 3 to return to its initial position; the pressure sensor 15 is used to detect whether the spring 6 is under pressure.

[0049] In this embodiment, when the latch 12 is opened, the spring 6 releases its elastic force, pushing the guide rod 5 to extend outward along the first guide rail 7. At the same time, the displacement sensor 11 records the displacement of the contactable probe 3. After the contactable probe 3 contacts the inner wall of the aperture, the pressure sensor 15 detects that the spring 6 is under pressure. When a specific value is reached, it transmits an energizing signal to the electromagnetic locking group. The energizing electromagnetic locking group generates a magnetic force that drives the guide rod 5 to return to its initial position. At this time, the magnetic force generated by the electromagnetic locking group is equal to the initial elastic force of the spring 6, and a signal is transmitted to the latch 12 to close the first guide rail 7. If the contactable probe 3 does not contact the inner wall of the aperture after the spring 6 has released its elastic force, the micro stepper motor 10 is started. The power is transmitted through the drive shaft 9 to drive the conjugate cam 8 to rotate. The rollers on the first guide rail 7 roll along the contour of the conjugate cam 8, driving the first guide rail 7 to continue to extend along the guide rail on the outer shell 1 until the contactable probe 3 contacts the inner wall of the aperture. Then the micro stepper motor 10 resets, thereby controlling the contactable probe 3 to reset.

[0050] Please see Figure 1 , Figure 2 , Figure 3 The user interaction module is located at the front end of the handle 2, and includes a data processor 16 and a display screen 17.

[0051] Please see Figure 1 , Figure 2 , Figure 3 The data processor 16 is mounted on the front end of the handle 2, and the display screen 17 is located on the right side of the data processor 16 on the handle 2. In particular, the data processor 16 is located on the right side of the micro stepper motor 10. The micro stepper motor 10 and the data processor 16 use graphene sheets and aluminum-magnesium alloy brackets for heat dissipation in the transition section of the handle 2 to avoid excessive temperature affecting the accuracy of the measurement data.

[0052] In this embodiment, the program set in the data processor 16 is mainly used to control the starting, resetting, and closing of the mechanisms in the control module, such as: controlling the starting, resetting, and closing of the micro stepper motor 10, controlling the starting and closing of the latch 12, controlling the energization and de-energization of the electromagnetic locking group, and also for automatic device calibration. The data processor 16 is also used to process measurement data. The data processor 16 processes the minimum value of three measurement data through the least squares algorithm to obtain the external working size of the aperture. The measurement results processed by the data processor 16 are directly displayed on the display screen 17 in the form of the maximum physical size, the actual size, and the minimum physical size. The display screen 17 is a touch screen, and the program can be selected directly through the display screen 17 to realize human-computer interaction and make the device operation simpler and more intelligent.

[0053] Please see Figure 1 , Figure 2 , Figure 3 The operation buttons include a power switch 18 and a reset button 19, which are mounted from bottom to top on the right side of the display screen 17.

[0054] In this embodiment, the power switch 18 is used to control the power supply of the device. When the power switch 18 is turned on, the device starts to run. The reset button 19 is used to reset the mechanism in the mechanical control module. After the measurement is completed, the reset button 19 is turned on, and all mechanisms that have performed actions during the measurement return to their original positions, enabling rapid entry into the next measurement, improving detection efficiency, and to a certain extent avoiding the possibility of the data processor 16 program malfunctioning and being unable to recover.

[0055] Please see Figure 1 , Figure 2 , Figure 3 The power supply module is located at the tail end of the handle 2, and the power supply module includes a lithium battery 20 and a charging port 21.

[0056] In this embodiment, a battery compartment is provided on the right side of the operation button on the handle 2. The lithium battery 20 is installed in the battery compartment and is replaceable. The charging port 21 is located at the tail end of the handle 2, and its axial center line coincides with the axial center line of the handle 2. The charging port 21 is used to charge the device, and the lithium battery 20 is used to store electricity in the device, so that the device can be used continuously in different measurement environments.

[0057] The portable external aperture measurement device provided in this embodiment, when in use, places the end of the device into the aperture to be measured, turns on the power switch 18, and opens the latch 12 through the program in the data processor 16. At this time, the electromagnetic locking group is de-energized, and the guide rod 5, under the action of the spring 6, drives the contactable probe 3 to extend into the first guide rail 7 until the contactable probe 3 contacts the inner wall of the aperture. If the contactable probe 3 still does not contact the inner wall of the aperture after the spring 6 has released its force, the micro stepper motor 10 is started through the program in the data processor 16. The drive shaft 9 transmits power to drive the conjugate cam 8 to rotate. The rollers on the first guide rail 7 roll along the contour of the conjugate cam 8, causing the first guide rail 7 to continue to extend outward until the contactable probe 3 contacts the inner wall of the aperture. After the contactable probe 3 contacts the inner wall of the aperture, the spring 6 is under pressure. When the pressure sensor 15 detects that the spring 6 is under pressure and reaches a specific value, it transmits an energizing signal to the electromagnetic locking group. 6. The electromagnetic locking group is powered on by the program control. The electromagnetic locking group generates a magnetic force to drive the contactable probe 3 back to its initial position. At this time, the magnetic force generated by the electromagnetic locking group is equal to the initial elastic force of the spring 6. The latch 12 is closed by the program control of the data processor 16, thus completing one measurement. Shaking the handle 2 up and down, two more measurements are taken. The data processor 16 processes the measurement data of the contactable probe 3 and the non-contact laser sensor 4, and takes the minimum value of the three measurement data as the final measurement data. The data processor 16 processes the final measurement data through the least squares algorithm and displays it on the display screen in the form of maximum physical size, actual size, and minimum physical size. During the measurement process, the lithium battery 12 provides power support for the device and can be charged through the charging port 13 at the end of the handle, so that the device can be used continuously in different measurement environments. Before use, the automatic calibration program of the data processor 16 can be used to complete the automatic calibration of the device to reduce measurement errors.

Claims

1. A portable external aperture measurement device, used for measuring the external aperture dimensions of parts in mobile scenarios or confined spaces, characterized in that, The measuring device includes a probe module, a control module, a user interaction module, operation buttons, and a power supply module; The probe module comprehensively covers the geometry of the inner wall of the aperture by combining direct contact and laser scanning, thereby obtaining more accurate actual dimensions and geometric errors. The control module is used to control the movement, positioning, and reset of the probe module, so that the probe module accurately reaches the measurement position and obtains accurate measurement results during measurement. The user interaction module is used for automatic control of the mechanism's movement, making the mechanism's movement simpler and reducing errors from manual operation. It is also used to process the measurement results of the probe module and display them in a simple way, making the measurement results intuitive and easy to understand. The operation buttons are used to restore all mechanisms that generate motion to their original positions and to control the power on and off of the entire device. The power supply module is used to charge and store electricity for the device, enabling the device to be used continuously in mobile environments.

2. The portable external aperture measurement device according to claim 1, characterized in that, The probe module includes a contact probe and a non-contact laser sensor; The device comprises three contact probes and three non-contact laser sensors. The contact probes are spaced 120° apart and distributed along the circumference of the device at the front end. The non-contact laser sensors are also spaced 120° apart and installed along the circumference of the device at the front end. The contact probes and non-contact laser sensors are staggered with a 60° phase difference. The contact probes obtain the actual aperture size by directly contacting multiple points of the aperture. The non-contact laser sensors are arc-shaped laser sensors that obtain the geometry of the inner wall of the aperture through multi-angle laser scanning, thereby obtaining a more accurate actual aperture size and geometric error.

3. The portable external aperture measurement device according to claim 1, characterized in that, The control module includes a mechanical control module and an intelligent control module; The mechanical control module includes a guide rod, a spring, a first guide rail, a conjugate cam, a drive shaft, and a micro stepper motor. One end of the guide rod is fixedly mounted with the contactable probe in the probe module and supports the radial movement of the contactable probe. The other end of the guide rod is connected to the first guide rail via a spring. The guide rod, spring, and first guide rail are radially connected along the device. The spring provides power to drive the contactable probe of the probe module to move radially along the device. The first guide rail is used to control the guide rod to move linearly. The first guide rail is connected to the conjugate cam via rollers. The conjugate cam, drive shaft, and micro stepper motor are axially connected along the device. The micro stepper motor transmits power through the drive shaft to drive the conjugate cam to rotate, thereby enabling the first guide rail to drive the movement of the contactable probe of the probe module. The intelligent control module includes a displacement sensor, a buckle, an electromagnetic locking assembly, and a pressure sensor. The displacement sensor is installed at the end of the guide rod to record the displacement of the contactable probe of the probe module. The buckle is installed at the top of the first guide rail for opening and closing the first guide rail. The electromagnetic locking assembly includes a magnetic ring and an electromagnet. The magnetic ring is installed at the bottom of the guide rod, and the electromagnet is installed at the bottom of the first guide rail to restore the guide rod to its initial position when energized. The pressure sensor is installed at the bottom of the first guide rail to detect whether the spring is under pressure. The control module controls the movement, positioning, and reset of the contactable probe of the probe module through a combination of mechanical and intelligent methods, thereby enabling the contactable probe of the probe module to obtain accurate actual hole diameter dimensions.

4. The portable external aperture measurement device according to claim 1, characterized in that, The user interaction module includes a data processor and a display screen; The data processor controls the reset of the mechanism in the control module through a program, processes the aperture size and geometric error measured by the probe module through a least squares algorithm, and completes the calibration of the portable aperture external action size measuring device through an automatic calibration program. The display screen allows for direct touch selection of programs, enabling human-computer interaction and displaying the measurement results processed by the data processor in a clear and easy-to-understand manner.

5. The portable external aperture measurement device according to claim 1, characterized in that, The operation buttons include a reset button and a power switch; The reset button is used to restore all mechanisms that have moved during the measurement process to their original positions. The power switch is used to control the opening and closing of the portable aperture external action dimension measuring device.

6. The portable external aperture measurement device according to claim 1, characterized in that, The power supply module includes a charging port and a lithium battery; The charging port is used for charging the portable aperture external action size measuring device; The lithium battery is replaceable and is used to store power for the portable aperture in vitro size measuring device, enabling the portable aperture in vitro size measuring device to be used continuously in different measurement environments.

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