Digital display carbon fiber comparison caliper and measurement method thereof

Abstract

This invention provides a digital display carbon fiber comparison caliper and its measurement method. The caliper includes a frame composed of stacked first and second carbon fiber plates; a first measuring component mounted at the first end of the frame, including a first probe holder and a first probe; a second measuring component mounted at the second end of the frame, including a second probe holder, a second probe, and a measuring dial indicator, the second measuring component being capable of sliding along the length of the frame; and a support base mounted at the bottom of the frame, capable of adjusting its height or horizontal position. This invention also discloses a measurement method based on this caliper, including adjustment preparation, support adjustment, calibration, measurement, and calculation steps. This invention uses a double-layer stacked carbon fiber frame, which is lightweight, rigid, and dual-purpose, accommodating both large-diameter outer diameter and large-gear common normal detection. It features lightweight design, high precision, good stability, convenient operation, and strong versatility, making it suitable for large-scale application in the fields of machining and gear manufacturing.

Description

Technical Field

[0001] This application belongs to the field of measuring instrument technology, and in particular relates to a digital display carbon fiber comparison caliper and its measurement method. Background Technology

[0002] The description in this section provides only background information related to the disclosure of this invention and does not constitute prior art.

[0003] In the fields of machining and quality inspection, high-precision measurement of the outer diameter of large workpieces (such as large shafts and rollers) is a common but challenging task.

[0004] Currently, commonly used measuring tools include calipers, micrometers, and specialized gauges. Calipers are convenient, but their accuracy is relatively poor, and the limited length of the jaws makes it difficult to accurately hold large-diameter cylindrical workpieces. Micrometers offer high accuracy, but large-size micrometers typically have large frames, are heavy, and are prone to deformation due to stress or temperature changes, leading to unstable measurement accuracy. While specialized gauges or instruments offer better accuracy, they are usually custom-made, expensive, and lack versatility, failing to meet the diverse needs of various measurement scenarios. Therefore, there is an urgent need for a lightweight, rigid, easy-to-operate, highly accurate, and widely applicable large-size outer diameter measuring tool.

[0005] For the measurement of common normals of large gears: Traditional common normal micrometers and ordinary calipers mostly use metal rulers, and large-range products are bulky and laborious to operate; at the same time, the measurement of common normals has strict requirements for the parallelism of the probes on both sides. Existing equipment generally suffers from problems such as difficulty in adjusting the parallelism of the probes, easy displacement of the probes during use, and rapid decline in accuracy. Especially for large gears with a size of 200mm or more, the measurement stability and practicality of conventional measuring tools are greatly reduced.

[0006] It should be noted that the above description of the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of the present invention and facilitating understanding by those skilled in the art. It should not be assumed that the above technical solutions are known to those skilled in the art simply because they have been described in the background section of this invention. Summary of the Invention

[0007] The purpose of this application is to provide a digital display carbon fiber comparison caliper and its measurement method to solve the above-mentioned problems existing in the prior art.

[0008] This application provides a digital display carbon fiber comparison caliper, comprising: A ruler frame made of carbon fiber composite material, the ruler frame comprising a first carbon fiber plate and a second carbon fiber plate stacked together; A first measuring component, which is installed at the first end of the ruler frame, includes a first probe base and a first probe installed on the first probe base; The second measuring component is installed at the second end of the ruler frame and includes a second probe base, a second probe installed on the second probe base, and a measuring meter. A lever for opening and closing the measurement is provided between the second probe and the ruler frame. The second measuring component can slide along the length direction of the ruler frame. A guide rail assembly, the guide rail assembly including a long shaft mounted on a first end of the ruler frame and a bearing mounted in the first measuring assembly, the bearing cooperating with the long shaft to realize the movement of the probe seat along the length direction of the ruler frame; A support base is installed on the bottom of the ruler frame to support the workpiece to be measured. The support base can be adjusted in height or horizontal position.

[0009] Furthermore, in the aforementioned digital display carbon fiber comparison caliper, the first carbon fiber plate and the second carbon fiber plate are connected by adhesive and / or screws, and the first carbon fiber plate and the second carbon fiber plate are parallel and spaced apart.

[0010] Furthermore, in the aforementioned digital display carbon fiber comparison caliper, both the first and second probes are cylindrical probes made of cemented carbide, and the first and second probe seats are cylindrical probe seats that are adapted to the cylindrical probes respectively. The axes of the first and second probes are perpendicular to the length direction of the ruler frame, and the parallelism between the first and second probes is 5μm.

[0011] Furthermore, in the aforementioned digital display carbon fiber comparison caliper, the travel of the measuring head is 10mm, and the measurement accuracy within the ±1mm range at any position is 5μm.

[0012] Furthermore, in the aforementioned digital display carbon fiber comparison caliper, the first side head and the second probe are disc-shaped probes used to measure the common normal of the workpiece. The first probe base and the second probe base are disc-shaped probe bases adapted to the disc-shaped probes. The first probe base is provided with a glue-filling fixing hole and a parallelism adjustment hole. A plurality of the parallelism adjustment holes are respectively arranged on the four sides of the first probe base and correspond to the same position of the first probe within the first probe base.

[0013] Furthermore, in the aforementioned digital display carbon fiber comparison caliper, the flatness of the disc probe is 1μm, the parallelism is 0.01mm, the diameter of the disc probe is 25mm or 35mm, the travel of the measuring head is 10mm, and the measurement accuracy is 0.01mm.

[0014] Furthermore, in the aforementioned digital display carbon fiber comparison caliper, the second measuring component also includes a bearing extension connected to the measuring head, and the other end of the bearing extension is connected to the second probe seat.

[0015] Furthermore, in the aforementioned digital display carbon fiber comparison caliper, the support base also includes a base, a height adjustment rod, and a set screw. The height adjustment rod is disposed between the first carbon fiber plate and the second carbon fiber plate. The height adjustment rod is slidably installed under the base and locked in place by the set screw. The height adjustment rod is provided with size scale lines.

[0016] Furthermore, in the aforementioned digital display carbon fiber comparison caliper, the actual moving distance between two adjacent height adjustment lever positions is half the value marked on the size scale line.

[0017] This application also provides a measurement method for the digital display carbon fiber comparison caliper as described above, including the following steps: Based on the theoretical dimensions of the workpiece to be measured, adjust the installation position of the first measuring component on the ruler frame so that the opening size of the caliper gauge is larger than the outer diameter of the workpiece to be measured and a preload is reserved, and then lock the first measuring component. Adjust the height and horizontal position of the support base according to the workpiece to be tested; Select gauge blocks or standard parts of the corresponding size and place them on the support base so that the standard parts contact the first and second probes. Move the second measuring component or swing the standard parts to find the inflection point of the measuring meter reading and set the measuring meter to zero. Pull out the second measuring component, remove the standard part, place the workpiece to be measured on the support base, release the second measuring component so that the two cylindrical probes contact the outer wall of the workpiece, swing the caliper or rotate the workpiece to find the inflection point of the measuring head reading, and read the reading of the measuring head. The actual dimensions of the workpiece are obtained by calculating the difference between the reading of the measuring instrument and the dimensions of the standard part.

[0018] As can be seen from the above technical solution, the present invention has the following beneficial effects: The digital carbon fiber comparator caliper described in this invention uses a carbon fiber composite material frame and a double-layered, parallel, stacked structure (first carbon fiber plate and second carbon fiber plate). This structure ensures sufficient dome and torsional rigidity of the frame while significantly reducing the overall weight. Carbon fiber has a density approximately 1 / 5 that of steel, but its specific strength is much higher. This results in a significant reduction in the weight of the large-size caliper of this invention, improving the user experience, especially suitable for large-size measurement scenarios, as it is less strenuous and reduces fatigue. Simultaneously, the extremely low coefficient of thermal expansion of carbon fiber (close to zero) minimizes the impact of environmental temperature changes, ensuring the long-term stability of the measurement reference.

[0019] This invention employs a guide rail assembly consisting of a long shaft and a bearing. The long shaft is mounted at the first end of the ruler frame, and the bearing is installed inside the first measuring component. The two work together to form a precision sliding pair, ensuring the straightness and repeatability of the second measuring component's movement along the length of the ruler frame. The parallelism between the first and second probes is controlled within 5µm, and the two cylindrical probes form stable line contact with the workpiece being measured, effectively avoiding measurement errors caused by probe skew. A digital display measuring head with a 10mm travel is used, achieving a measurement accuracy of 5µm within a ±1mm range at any position. Combined with a comparative measurement method, high-precision measurement of large outer diameters can be achieved. This invention features two detachable specifications: a cylindrical probe and a disc probe. Switching between them is convenient. One device can measure the outer diameter of large workpieces and the common normal of large gears, replacing two types of traditional special measuring tools, reducing equipment procurement costs and storage space, and adapting to the testing needs of multiple industries such as machining and gear manufacturing. The measurement method provided by this invention adopts a "standard part calibration-comparative measurement" technical approach. It uses standard gauge blocks or standard parts to calibrate and zero the caliper gauge, eliminating systematic errors inherent in the caliper gauge itself (such as frame deformation, assembly clearance, etc.). During the measurement process, the "inflection point finding" operation ensures that each measurement accurately captures the maximum value of the workpiece's outer diameter (i.e., the true diameter), thereby guaranteeing the accuracy and repeatability of the measurement results. This method is logically clear, has standardized operation, and possesses good operability and traceability. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the digital display carbon fiber comparison caliper provided in Embodiment 1 of this application; Figure 2 and Figure 3 This is a partial schematic diagram of the digital display carbon fiber comparison caliper provided in Embodiment 1 of this application; Figure 4 This is a schematic diagram of the connection between the support base and the frame of the digital display carbon fiber comparison caliper provided in Embodiment 1 of this application; Figures 5 to 7 This is a schematic diagram of the structure of the digital display carbon fiber comparison caliper provided in Embodiment 2 of this application.

[0022] In the picture: 1. Frame; 11. First carbon fiber plate; 12. Second carbon fiber plate; 2. First measuring component; 21. First probe holder; 22. First probe; 23. Glue fixing hole; 24. Parallelism adjustment hole; 3. Second measuring component; 31. Second probe holder; 32. Second probe; 33. Measuring head; 34. Bearing extension component; 4. Long axis; 5. Bearings; 6. Support base; 61. Base; 62. Height adjustment rod; 63. Set screw; 7. Lever. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0024] In the description of this invention, it should be noted that the terms "upper," "middle," "lower," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or component 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 the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The embodiments of this invention will now be described according to its overall structure.

[0025] Example 1 Reference Figures 1 to 4 This application provides a digital display carbon fiber comparison caliper, specifically designed for measuring the outer diameter of large-sized shaft-like workpieces, including: Ruler frame 1, which is made of carbon fiber composite material, includes a first carbon fiber plate 11 and a second carbon fiber plate 12 stacked together; The first measuring component 2 is installed at the first end of the ruler frame 1 and includes a first probe base 21 and a first probe 22 installed on the first probe base 21; The second measuring component 3 is installed at the second end of the ruler frame 1 and includes a second probe base 31, a second probe 32 installed on the second probe base 31, and a measuring head 33. The second measuring component 3 can slide along the length direction of the ruler frame 1. The guide rail assembly includes a long shaft 4 mounted on the first end of the ruler frame 1 and a bearing 5 mounted in the first measuring component 2. The bearing 5 cooperates with the long shaft 4 to realize the movement of the probe seat along the length direction of the ruler frame 1. Support base 6 is installed on the bottom of the ruler frame 1 to support the workpiece to be measured. The support base 6 can adjust its height or horizontal position.

[0026] The frame 1 serves as the baseline skeleton for the entire caliper. To minimize weight while maintaining rigidity, the frame 1 is made of carbon fiber composite material. Specifically, this embodiment uses two carbon fiber plates: a first carbon fiber plate 11 and a second carbon fiber plate 12. These plates are parallel and spaced apart, forming a cavity in the middle, and are connected as a whole using high-strength structural adhesive and screws for fastening. This "stacked + spaced" structure significantly improves the bending and torsional stiffness of the frame 1, while utilizing the central cavity to accommodate components such as the long axis 4 of the guide rail assembly, resulting in a compact structure.

[0027] The first measuring component 2 is fixedly installed at the first end of the ruler frame 1. It includes a first probe seat 21 that can be finely adjusted and locked along the length of the ruler frame 1, and a first probe 22 made of hard alloy material installed on the first probe seat 21. The axis of the first probe 22 is perpendicular to the length of the ruler frame 1, and a high-hardness steel long shaft 4 that has been precision ground is fixedly installed along the length of the frame. This long shaft 4 serves as a reference for sliding guidance.

[0028] The second measuring assembly 3 is movably mounted on the second end of the ruler frame 1. Its core component is a second probe holder 31, which contains a precision bearing for sliding and ensuring accuracy. A second probe 32 is mounted on the second probe holder 31, and its axis is parallel to the axis of the first probe 22, forming a measuring pair.

[0029] To facilitate quick opening of the movable end for inserting or removing the workpiece during measurement, a lever 7 is also provided on the second probe holder 31. The operator can easily drive the second measuring component 3 to slide along the long axis 4 by holding the lever 7.

[0030] The second probe holder 31 is also equipped with a bearing extension 34, and the measuring rod of the digital display measuring head 33 (such as a digital dial indicator or an inductive sensor) contacts the bearing extension 34. When the second probe holder 31 moves, its displacement is accurately transmitted to the measuring head 33 through the bearing extension 34.

[0031] Specifically, in this embodiment, the first carbon fiber plate 11 and the second carbon fiber plate 12 are connected by adhesive and / or screws, and the first carbon fiber plate 11 and the second carbon fiber plate 12 are parallel and spaced apart.

[0032] Specifically, in this embodiment, the first probe 22 and the second probe 32 are both tungsten carbide probes made of hard alloy. The axes of the first probe 22 and the second probe 32 are perpendicular to the length direction of the ruler frame 1. A lever 7 for opening and closing measurement is provided between the second probe 32 and the ruler frame 1.

[0033] A lever 7 is provided between the second measuring component 3 and the ruler frame 1. The operator can pull the lever 7 with one hand to quickly open the second measuring component 3, which facilitates the loading and unloading of standard parts and workpieces and improves the efficiency of batch inspection.

[0034] The cylindrical probe makes line contact with the workpiece being measured. In actual measurement, the operator only needs to slightly swing the caliper or rotate the workpiece to quickly find the maximum value (inflection point) based on the change in the reading of the measuring instrument 33, which reduces the difficulty of operation and the skill requirements of the operator.

[0035] Specifically, in this embodiment, the parallelism between the first probe 22 and the second probe 32 is 5 μm.

[0036] Specifically, in this embodiment, the second measuring component 3 further includes a bearing extension 34 connected to the measuring head 33, and the other end of the bearing extension 34 is connected to the second probe seat 31.

[0037] Specifically, in this embodiment, the travel of the measuring head 33 is 10mm, and the measurement accuracy within a ±1mm range at any position is 5μm. The parallelism of the first probe 22 and the second probe 32 is controlled within 5μm, and the two cylindrical probes form a stable line contact with the workpiece being measured, effectively avoiding measurement errors caused by probe skew.

[0038] Specifically, in this embodiment, the support base 6 further includes a base 61, a height adjustment rod 62, and a set screw 63. The height adjustment rod 62 is disposed between the first carbon fiber plate 11 and the second carbon fiber plate 12. The height adjustment rod 62 is slidably installed under the base 61 and locked and fixed by the set screw 63.

[0039] The support base 6 is installed at the bottom of the ruler frame 1. It includes a base 61 connected to the ruler frame 1, a height adjustment rod 62, and a set screw 63. The height adjustment rod 62 is positioned between the first carbon fiber plate 11 and the second carbon fiber plate 12, making full use of the space between the two layers of plates. The top of the height adjustment rod 62 forms a flat rectangular support surface base 61 for supporting the workpiece being measured.

[0040] The height adjustment rod 62 is slidably mounted below the base 61 and locked in place by the set screw 63. The height adjustment rod 62 has multiple dimensional scale lines, and the actual moving distance between two adjacent positions is half the value marked on the scale line, with a scale ratio of 1:2, to accommodate the support height requirements of workpieces with different diameters. Since the change in support height corresponds to the change in the radius of the workpiece being measured, and the scale marks the diameter of the workpiece (twice the radius), a 1:2 scale ratio is used on the height adjustment rod 62. The physical distance between two adjacent adjustment positions on the height adjustment rod 62 is 50mm, corresponding to a scale line value of 100mm. Therefore, the operator can directly read the scale value based on the diameter of the workpiece being measured without radius conversion, significantly improving adjustment efficiency and operational intuitiveness, and expanding the effective adaptation range of the support base. The operator can quickly preset the support height based on the theoretical dimensions of the workpiece being measured. Furthermore, the support base 6 can also be finely adjusted horizontally.

[0041] By employing the aforementioned structure, this invention utilizes carbon fiber composite material to fabricate the ruler frame 1, and adopts a double-layer parallel and spaced stacked structure (first carbon fiber plate 11 and second carbon fiber plate 12). This ensures that the ruler frame 1 has sufficient anti-docking and anti-torsional rigidity while significantly reducing the overall weight. Carbon fiber has a density approximately 1 / 5 that of steel, but its specific strength is much higher. This results in a significant reduction in the weight of the large-size calipers of this invention, improving the user experience, and making it particularly suitable for large-size measurement scenarios, as it is less strenuous and less prone to fatigue. Simultaneously, the extremely low coefficient of thermal expansion of carbon fiber (close to zero) minimizes the impact of environmental temperature changes, ensuring the long-term stability of the measurement reference.

[0042] This invention employs a guide rail assembly consisting of a long shaft 4 and a bearing 5. The long shaft 4 is mounted at the first end of the ruler frame 1, and the bearing 5 is installed inside the first measuring component 2. The two components work together to form a precision sliding pair, ensuring the straightness and repeatability of the second measuring component 3 as it moves along the length of the ruler frame 1. The parallelism between the first probe 22 and the second probe 32 is controlled within 5 μm. The two cylindrical probes form stable line contact with the workpiece being measured, effectively avoiding measurement errors caused by probe skew. A digital display measuring head 33 with a travel of 10 mm provides a measurement accuracy of 5 μm within a ±1 mm range at any position. Combined with a comparative measurement method, high-precision measurement of large outer diameters can be achieved.

[0043] This embodiment also provides a measurement method for digital display carbon fiber comparison calipers, used to accurately measure the outer diameter of large shaft-type workpieces, including the following steps: According to the theoretical outer diameter of the workpiece to be measured, adjust the installation position of the first measuring component 2 on the ruler 1 so that the opening size of the caliper is larger than the outer diameter of the workpiece to be measured and a preload is reserved, and then lock the first probe seat 21; the preload is used to ensure that the second measuring component 3 is always in an inward elastic contact state during measurement, eliminate the back gap, and ensure the stability of the measurement contact. Adjust the height and horizontal position of the support base 6 according to the workpiece to be tested; Select a gauge block or standard part of the corresponding size and place it on the support base 6 so that the standard part contacts the first probe 22 and the second probe 32. Move the second measuring component 3 or swing the standard part to find the inflection point of the reading of the measuring meter 33 and set the measuring meter 33 to zero. Pull out the second measuring component 3, remove the standard part, place the workpiece to be measured on the support base 6, release the second measuring component 3 so that the two cylindrical probes contact the outer diameter of the workpiece, swing the caliper or rotate the workpiece to find the inflection point of the reading of the measuring head 33, and read the reading of the measuring head 33. The actual outer diameter of the workpiece is obtained by calculating the difference between the reading of the measuring instrument 33 and the size of the standard part.

[0044] Example 2 Reference Figures 5 to 7 This application provides a digital display carbon fiber comparison caliper, specifically designed for measuring the common normal length of large-size gears. It utilizes the double-layer carbon fiber ruler frame 1, guide rail assembly, support base 6, measuring head 33, and lever 7 structure of Embodiment 1. The first measuring component 2 and the second measuring component 3 of Embodiment 1 are replaced, and the first probe 22 and the second probe 32 are replaced with disc-shaped probes for measuring the common normal of workpieces. The diameter of the disc-shaped probe is 25mm (a 35mm diameter disc-shaped probe can be used as needed). The first probe base 21 and the second probe base 31 are disc-shaped probe bases adapted to the disc-shaped probes. The first probe base 21 has a glue-filling fixing hole 23 and multiple parallelism adjustment holes 24. The multiple parallelism adjustment holes 24 are respectively located on the four sides of the first probe base 21 and correspond to the same position of the first probe 22 within the first probe base 21.

[0045] The mounting hole of the disc-shaped probe holder 21 has a taper of approximately 1°. The disc-shaped probe is initially positioned within the tapered hole. It is then fixed in place at four positions (top, bottom, left, right) using hexagonal set screws. The parallelism of the two disc-shaped probes is then checked and adjusted using the four hexagonal set screws, gradually correcting the position of the probes on both sides. After calibration, the flatness of the disc-shaped probes is 1μm, and the parallelism is within 0.01mm. Once the parallelism adjustment is complete, high-temperature special fixing feet are injected into the glue-filling fixing hole 23 of the probe holder. The mixture is then allowed to cure, permanently releasing the disc-shaped probes and preventing displacement during long-term use. In this mode, the overall measurement accuracy of the equipment is 0.01mm, and the travel distance of the measuring head 33 is 10mm.

[0046] The common normal length is defined as the distance between two parallel planes tangent to the two opposite tooth surfaces. This definition dictates that the contact form for measurement can only be the tangency of a plane to the tooth surface. In this embodiment, the disc probe contacts the gear in a planar structure. The cylindrical probe only has a single-point contact with the tooth profile, and the contact point is prone to shifting, making it impossible to establish a stable parallel measurement reference.

[0047] This embodiment also provides a measurement method for a digital display carbon fiber comparison caliper, used to accurately measure the common normal length of large-size gears, including the following steps: Check the fixed state of the disc probe and confirm that the parallelism and flatness meet the requirements; according to the theoretical length of the common normal of the gear to be measured, adjust the position of the first measuring component 2 and the height and horizontal position of the support base 6, and lock all adjusting components. Adjust the height of the support base 6 to align the center of the gear with the center of the two disc probes. Select the standard part with the corresponding specification and place it on the support base 6, so that the working surfaces of the two sets of disc probes are in contact with the standard part. Swing the standard part to find the inflection point of the meter reading and complete the measurement meter 33 to zero. Pull out the second measuring component 3, remove the standard part, place the large gear to be measured on the support 6, make the two disc probes contact the tooth surface of the gear, slowly swing the caliper, find the maximum value of the reading of the measuring head 33, and read the value. Calculate the difference between the reading on the measuring instrument 33 and the size of the standard part to obtain the actual common normal length of the gear being measured.

[0048] The measurement method provided by this invention adopts a "standard part calibration-comparative measurement" technical approach. It uses standard gauge blocks or standard parts to calibrate and zero the caliper gauge, eliminating systematic errors inherent in the caliper gauge itself (such as deformation of the frame 1, assembly clearance, etc.). During the measurement process, the "inflection point finding" operation ensures that each measurement accurately captures the maximum value of the workpiece's outer diameter (i.e., the true diameter), thereby guaranteeing the accuracy and repeatability of the measurement results. This method has clear logic, standardized operation, and good operability and traceability.

[0049] Although different specific embodiments are mentioned in this application, this application is not limited to the situations described in industry standards or embodiments. Slightly modified implementations based on certain industry standards or custom methods or embodiments can also achieve the same, equivalent, or similar, or predictable, implementation effects as the above embodiments. Embodiments applying these modified or modified data acquisition, processing, output, and judgment methods still fall within the scope of optional implementations of this application.

[0050] Although this application has been described by way of examples, those skilled in the art will know that this application has many modifications and variations without departing from the spirit of this application, and it is intended that the appended embodiments include these modifications and variations without departing from this application.

Claims

1. A digital display carbon fiber comparator caliper, characterized in that, include: A ruler frame made of carbon fiber composite material, the ruler frame comprising a first carbon fiber plate and a second carbon fiber plate stacked together; A first measuring component, which is installed at the first end of the ruler frame, includes a first probe base and a first probe installed on the first probe base; The second measuring component is installed at the second end of the ruler frame and includes a second probe base, a second probe installed on the second probe base, and a measuring meter. A lever for opening and closing the measurement is provided between the second probe and the ruler frame. The second measuring component can slide along the length direction of the ruler frame. A guide rail assembly, the guide rail assembly including a long shaft mounted on a first end of the ruler frame and a bearing mounted in the first measuring assembly, the bearing cooperating with the long shaft to realize the movement of the probe seat along the length direction of the ruler frame; A support base is installed on the bottom of the ruler frame to support the workpiece to be measured. The support base can be adjusted in height or horizontal position.

2. The digital display carbon fiber comparison caliper according to claim 1, characterized in that, The first carbon fiber plate and the second carbon fiber plate are connected by adhesive and / or screws, and the first carbon fiber plate and the second carbon fiber plate are parallel and spaced apart.

3. The digital display carbon fiber comparison caliper according to claim 1, characterized in that, Both the first and second probes are cylindrical probes made of cemented carbide. The first and second probe holders are cylindrical probe holders that are adapted to the cylindrical probes. The axes of the first and second probes are perpendicular to the length direction of the ruler frame. The parallelism between the first and second probes is 5 μm.

4. The digital display carbon fiber comparison caliper according to claim 3, characterized in that, The measuring head has a travel of 10mm, and the measurement accuracy within a ±1mm range at any position is 5μm.

5. The digital display carbon fiber comparison caliper according to claim 1, characterized in that, The first side head and the second probe are disc-shaped probes used to measure the common normal of the workpiece. The first probe base and the second probe base are disc-shaped probe bases adapted to the disc-shaped probes. The first probe base is provided with a glue-filling fixing hole and multiple parallelism adjustment holes. The multiple parallelism adjustment holes are respectively arranged on the four sides of the first probe base and correspond to the same position of the first probe in the first probe base.

6. The digital display carbon fiber comparison caliper according to claim 5, characterized in that, The disc-shaped probe has a flatness of 1 μm, a parallelism of 0.01 mm, a diameter of 25 mm or 35 mm, a travel of 10 mm, and a measurement accuracy of 0.01 mm.

7. The digital display carbon fiber comparison caliper according to claim 1, characterized in that, The second measuring component also includes a bearing extension connected to the measuring head, the other end of which is connected to the second probe seat.

8. The digital display carbon fiber comparison caliper according to claim 1, characterized in that, The support base also includes a base, a height adjustment rod, and a set screw. The height adjustment rod is disposed between the first carbon fiber plate and the second carbon fiber plate. The height adjustment rod is slidably installed under the base and locked in place by the set screw. The height adjustment rod is provided with size scale lines.

9. The digital display carbon fiber comparison caliper according to claim 8, characterized in that, The actual moving distance between two adjacent height adjustment positions is half the value marked on the dimension scale.

10. A measurement method for a digital display carbon fiber comparison caliper as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Based on the theoretical dimensions of the workpiece to be measured, adjust the installation position of the first measuring component on the ruler frame so that the opening size of the caliper is larger than the outer diameter of the workpiece to be measured and a preload is reserved, and then lock the first measuring component. Adjust the height and horizontal position of the support base according to the workpiece to be tested; Select gauge blocks or standard parts of the corresponding size and place them on the support base so that the standard parts contact the first and second probes. Move the second measuring component or swing the standard parts to find the inflection point of the measuring meter reading, and then set the measuring meter to zero. Pull out the second measuring component, remove the standard part, place the workpiece to be measured on the support base, release the second measuring component so that the two probes contact the outer wall of the workpiece, swing the caliper or rotate the workpiece to find the inflection point of the measuring head reading, and read the reading of the measuring head. The actual dimensions of the workpiece are obtained by calculating the difference between the reading of the measuring instrument and the dimensions of the standard part.

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