A multifunction measuring device

Abstract

The application provides a multifunctional measuring device, and relates to the technical field of measuring tools.The multifunctional measuring device comprises a measuring scale, a controller and a display screen, the controller and the display screen are electrically connected, and are arranged on the measuring scale, the measuring scale comprises a main scale and a secondary scale which are rotationally connected with each other, and the main scale and / or the secondary scale is / are provided with a scale line, a first sliding block is slidably connected to the main scale, a second sliding block is slidably connected to the secondary scale, the first sliding block and the second sliding block are used for abutting against a measured object respectively, an angle sensor and a displacement sensor are arranged on the measuring scale, and the display screen is used for displaying data obtained by the angle sensor and the displacement sensor and a radial size of the measured object calculated by the controller.The multifunctional measuring device can be used as a ruler, an angle ruler and a diameter (radius) measuring scale, is easy to carry and store by workers, can reduce the time for replacing measuring tools in the measuring work, and improves the measuring efficiency.

Description

Technical Field

[0001] This invention relates to the field of measuring tool technology, and more specifically, to a multifunctional measuring device. Background Technology

[0002] Measuring tools are devices or instruments used to determine physical quantities. They help acquire various types of data for analysis, comparison, or recording. There are many types of measuring tools, common ones including rulers for measuring lengths, protractors for measuring angles, and vernier calipers for measuring diameters.

[0003] However, the functions of existing measuring tools are relatively independent, such as measuring distance, angle, and diameter independently. In practice, it is often necessary to carry multiple testing tools at the same time and change measuring tools multiple times during use, resulting in low measurement efficiency. Summary of the Invention

[0004] The problem to be solved by this invention is: how to provide a multifunctional measuring device.

[0005] This invention provides a multifunctional measuring device, comprising: a measuring ruler, a controller, and a display screen. The controller and the display screen are electrically connected and both are mounted on the measuring ruler. The measuring ruler includes a main ruler and a secondary ruler rotatably connected to each other, and the main ruler and / or the secondary ruler are provided with scale lines. A first slider is slidably connected to the main ruler, and a second slider is slidably connected to the secondary ruler. The first slider and the second slider are respectively used to abut against the object being measured. The measuring ruler is provided with an angle sensor and a displacement sensor. The angle sensor is used to obtain the angle between the main ruler and the secondary ruler and feed it back to the controller. The displacement sensor is used to obtain the distance between the first slider and / or the second slider and the rotation axis of the main ruler and the secondary ruler and feed it back to the controller. The controller is used to calculate the radial dimension of the object being measured based on the data detected by the angle sensor and the displacement sensor. The display screen is used to display the data obtained by the angle sensor and the displacement sensor, as well as the radial dimension of the object being measured calculated by the controller.

[0006] The multifunctional measuring device provided by this invention has, but is not limited to, the following beneficial effects compared to the prior art:

[0007] The multifunctional measuring device of this invention integrates length measurement, angle measurement, and radius measurement functions. Specifically, when length measurement is required, it can be read through the scale lines set on the main ruler and / or vernier ruler. When angle measurement is required, the vernier ruler can be rotated relative to the main ruler to the target angle. The angle sensor can obtain the angle between the main ruler and the vernier ruler and display it in real time on the screen for convenient data reading. When radius measurement is required, the vernier ruler is first rotated relative to the main ruler by a certain angle. Then, the first and second sliders are moved to the vicinity of the object being measured and together abut against the object. The first and second sliders move the same distance. At this time, the controller can calculate the radius of the object being measured based on the data detected by the angle sensor and the displacement sensor and display it in real time on the screen for convenient data reading. Compared with the prior art, the multifunctional measuring device of this invention can be used as a ruler, angle ruler, and diameter (radius) measuring ruler. It is easy for workers to carry and store, reduces the time spent changing measuring tools during measurement work, and improves measurement efficiency.

[0008] Optionally, the first slider includes a first body, a first circular block, and a second circular block. The first body is slidably connected to the main scale. The first and second circular blocks are spaced apart on the side of the first body near the secondary scale, and the line connecting the centers of the first and second circular blocks is parallel to the center line of the main scale. The second slider includes a second body, a third circular block, and a fourth circular block. The second body is slidably connected to the secondary scale. The third and fourth circular blocks are spaced apart on the side of the slider body near the main scale, and the line connecting the centers of the third and fourth circular blocks is parallel to the center line of the secondary scale. The first, second, third, and fourth circular blocks are used to jointly abut against the object being measured.

[0009] Optionally, the controller is configured to operate according to the formula: Calculate the radius R of the object being measured, where: R is the radius of the object being measured; θ is the angle between the centerline of the main scale and the centerline of the vernier scale; OB is a line segment on the centerline of the main scale, where point O is the axis of rotation of the main scale and the vernier scale, and line segment O1B is the perpendicular line from the center O1 of the object being measured to the centerline of the main scale; L is the distance between line segment OB and line segment O'B' and the distance between line segment OC and line segment O'C', where line segment OC is the radius of the vernier scale. The center line of the ruler is defined by line segment O'B', which is a straight line passing through the center of the first circular block and the center of the second circular block, and line segment O'C', which is a straight line passing through the center of the third circular block and the center of the fourth circular block. Point O' is the intersection of line segments O'B' and O'C', point B' is the midpoint of the line connecting the center of the first circular block and the center of the second circular block, and O1B'⊥O'B'; point O2 is the center of the first circular block; and r is the radius of the first circular block.

[0010] Optionally, the first circular block is located on the side closer to the rotation axis of the main scale and the secondary scale relative to the second circular block, and a first positioning hole is provided at the center of the first circular block. The third circular block is located on the side closer to the rotation axis of the main scale and the secondary scale relative to the fourth circular block, and a second positioning hole is provided at the center of the third circular block. A positioning pin is detachably connected to the measuring scale, and the positioning pin is used to pass through the first positioning hole and the second positioning hole to position the first circular block and the third circular block.

[0011] Optionally, the positioning pin includes a pin shaft portion and a grip portion connected to each other, and a threaded hole is provided at one end of the main scale away from the rotation axis of the main scale and the secondary scale, and the pin shaft portion is used for threaded connection to the threaded hole.

[0012] Optionally, the main ruler includes a main ruler body and a main ruler cover disposed on the main ruler body. A main ruler guide rail is provided on the end face of the main ruler body facing the main ruler cover. The first slider is slidably connected to the main ruler guide rail. The display screen is disposed on the end face of the main ruler cover opposite to the main ruler body.

[0013] Optionally, a first spring sheet is provided on the end face of the first slider facing the main scale guide rail, and the first spring sheet is used to provide damping for the movement of the first slider.

[0014] Optionally, the auxiliary ruler includes an auxiliary ruler body and an auxiliary ruler cover disposed on the auxiliary ruler body. An auxiliary ruler guide rail is provided on the end face of the auxiliary ruler body facing the auxiliary ruler cover, and the second slider is slidably connected to the auxiliary ruler guide rail.

[0015] Optionally, a second spring is provided on the end face of the second slider facing the vernier guide rail, the second spring being used to provide damping for the movement of the second slider.

[0016] Optionally, a through groove is provided at one end of the main scale, and a rotating shaft is provided in the through groove. The main scale is rotatably connected to the secondary scale through the rotating shaft, and the angle sensor is located at the through groove. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the multifunctional measuring device according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the first slider in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the first slider mounted on the main scale body according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the positioning pin according to an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the principle of the multifunctional measuring device for measuring radius according to an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] Main scale 1, main scale body 11, main scale top cover 12, auxiliary scale 2, auxiliary scale body 21, auxiliary scale top cover 22, display screen 3, first slider 4, first body 41, first circular block 42, second circular block 43, first spring 44, second slider 5, third circular block 52, fourth circular block 53, positioning pin 6, pin shaft part 61, grip part 62, power on / off button 7, reset button 8, confirmation button 9. Detailed Implementation

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] In the description of this invention, the orientations or positional relationships indicated by terms such as "up," "down," "left," "right," "top," "bottom," "front," "back," "inner," and "outer" are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this invention. They are not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this invention.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] In the description of this specification, references to terms such as "embodiment," "one embodiment," and "one implementation" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0028] Furthermore, in the attached diagram, the Z-axis represents the vertical direction, that is, the up and down position, and the positive direction of the Z-axis (that is, the direction the arrow of the Z-axis points) represents up, and the negative direction of the Z-axis (that is, the direction opposite to the positive direction of the Z-axis) represents down.

[0029] It should also be noted that the aforementioned Z-axis designation is only for the purpose of facilitating and simplifying the description of the present invention, and is not intended to 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, it should not be construed as a limitation of the present invention.

[0030] like Figures 1 to 2 As shown, the multifunctional measuring device of this invention includes: a measuring ruler, a controller, and a display screen 3. The controller is electrically connected to the display screen 3 and is mounted on the measuring ruler. The measuring ruler includes a main ruler 1 and a secondary ruler 2 rotatably connected to each other, and the main ruler 1 and / or the secondary ruler 2 are provided with scale lines. A first slider 4 is slidably connected to the main ruler 1, and a second slider 5 is slidably connected to the secondary ruler 2. The first slider 4 and the second slider 5 are respectively used to abut against the object being measured. An angle sensor and a displacement sensor are provided on the measuring ruler. The angle sensor is used to obtain the angle between the main ruler 1 and the secondary ruler 2 and feed it back to the controller. The displacement sensor is used to obtain the distance between the first slider 4 and / or the second slider 5 and the rotation axis of the main ruler 1 and the secondary ruler 2 and feed it back to the controller. The controller is used to calculate the radial dimension of the object being measured based on the data detected by the angle sensor and the displacement sensor. The display screen 3 is used to display the data obtained by the angle sensor and the displacement sensor, as well as the radial dimension of the object being measured calculated by the controller.

[0031] In this embodiment, length measurement, angle measurement, and radius measurement functions are integrated. Specifically, when length measurement is required, it can be read through the scale lines set on the main ruler 1 and / or the vernier ruler 2. When angle measurement is required, the vernier ruler can be rotated relative to the main ruler to the target angle. The angle sensor can obtain the angle between the main ruler and the vernier ruler and display it in real time on the screen for easy data reading. When radius measurement is required, the vernier ruler is first rotated relative to the main ruler by a certain angle. Then, the first slider and the second slider are moved to the vicinity of the object being measured and together abut against the object. The first slider and the second slider move the same distance. At this time, the controller can calculate the radius of the object being measured based on the data detected by the angle sensor and the displacement sensor and display it in real time on the screen for easy data reading. Compared with the prior art, the multifunctional measuring device of this invention can be used as a ruler, an angle ruler, and a diameter (radius) measuring ruler. It is easy for workers to carry and store, which can reduce the time spent changing measuring tools during measurement work and improve measurement efficiency.

[0032] Optionally, the first slider 4 includes a first body 41, a first circular block 42, and a second circular block 43. The first body 41 is slidably connected to the main ruler 1. The first circular block 42 and the second circular block 43 are spaced apart on the side of the first body 41 near the secondary ruler 2, and the line connecting the centers of the first circular block 42 and the second circular block 43 is parallel to the center line of the main ruler 1. The second slider 5 includes a second body, a third circular block 52, and a fourth circular block 53. The second body is slidably connected to the secondary ruler 2. The third circular block 52 and the fourth circular block 53 are spaced apart on the side of the slider body near the main ruler 1, and the line connecting the centers of the third circular block 52 and the fourth circular block 53 is parallel to the center line of the secondary ruler 2. The first circular block 42, the second circular block 43, the third circular block 52, and the fourth circular block 53 are used to jointly abut against the object being measured.

[0033] In this embodiment, in conjunction with the appendix Figure 1 and attached Figure 2As shown, the first body 41 can be a rectangular block structure that is slidably connected to the main scale 1. A first circular block 42 and a second circular block 43 are connected at intervals on the side of the first body 41 near the secondary scale 2. The overall structure of the second slider 5 is the same as that of the first slider 4. Similarly, the second body 41 can also be a rectangular block structure that is slidably connected to the secondary scale 2. A third circular block 52 and a fourth circular block 53 are connected at intervals on the side of the second body near the main scale 1. The structures of the first circular block 42, the second circular block 43, the third circular block 52, and the fourth circular block 53 can all be the same and are used to abut against the outer peripheral wall of the object being measured.

[0034] Optionally, the controller is configured to operate according to the formula: Calculate the radius R of the object being measured, where: R is the radius of the object being measured; θ is the angle between the centerline of the main ruler 1 and the centerline of the secondary ruler 2; OB is a line segment on the centerline of the main ruler 1, where point O is the axis of rotation of the main ruler 1 and the secondary ruler 2, and line segment O1B is the perpendicular line from the center O1 of the object being measured to the centerline of the main ruler 1; L is the distance between line segment OB and line segment O'B' and the distance between line segment OC and line segment O'C', where line segment OC is the centerline of the secondary ruler 2, and line segment O'B' is the distance between the centerline of the secondary ruler 2 and the centerline of the secondary ruler 2. The line segment O'C' is a straight line passing through the center of the first circular block 42 and the center of the second circular block 43 (O′B′ / / OB). The line segment O'C' is a straight line passing through the center of the third circular block 52 and the center of the fourth circular block 53 (O′C′ / / OC). Point O' is the intersection of line segment O'B' and line segment O'C'. Point B' is the midpoint of the line connecting the center of the first circular block 42 and the center of the second circular block 43, and O1B'⊥O'B'. Point O2 is the center of the first circular block 42. r is the radius of the first circular block 42.

[0035] In this embodiment, taking the measurement of the radius of a circular or arc-shaped structure as an example, combined with the attached... Figure 5 As shown, the principle of this multifunctional measuring device for testing the radius is as follows: An angle sensor is used to measure the angle θ (the angle between the centerline of the main scale 1 and the centerline of the secondary scale 2) between the main scale 1 and the secondary scale 2. Based on the distance L from point B' (the midpoint of the line connecting the center of the first circular block 42 and the center of the second circular block 43) to the centerline of the main scale 1, the radius of the secondary scale 2 is calculated. Figure 5 The distance to the median line OA is:

[0036] The distance to line OB is measured using a displacement sensor. Based on the geometric relationship OB = OA + AB, the distance can be calculated. According to the geometric relationships of a rectangle, we know that...

[0037] According to trigonometric functions, we know that... Calculations show that,

[0038] Based on the properties of a right triangle, we know that (O1B′) 2 +(O2B′) 2 =(R+r) 2 Calculation yields Where OB, θ, and O2B′ are all known quantities, and L is a fixed dimension, which can be considered a known quantity. (Appendix) Figure 5 Point O2 is the center of the first circular block 42, and point O3 is the center of the second circular block 43.

[0039] Optionally, the first circular block 42 is located on the side near the rotation axis of the main scale 1 and the auxiliary scale 2 relative to the second circular block 43, and a first positioning hole is provided at the center of the first circular block 42. The third circular block 52 is located on the side near the rotation axis of the main scale 1 and the auxiliary scale 2 relative to the fourth circular block 53, and a second positioning hole is provided at the center of the third circular block 52. A positioning pin 6 is detachably connected to the measuring scale. The positioning pin 6 is used to pass through the first positioning hole and the second positioning hole to position the first circular block 42 and the third circular block 52.

[0040] In this embodiment, in conjunction with the appendix Figure 1 As shown, main ruler 1 and secondary ruler 2 are positioned vertically (see attached diagram). Figure 1 The structure is designed with the secondary scale 2 connected to the primary scale 1 via a pivot, and the secondary scale 2 is located below the primary scale 1. A positioning pin 6 is used to ensure that the first circular block 42 and the third circular block 52 are at the same distance from the rotation axes of the primary scale 1 and the secondary scale 2. Specifically, the first slider 4 is moved to an appropriate position along the primary scale 1, the second slider 5 is moved to the same distance along the secondary scale 2 as the first slider 4, and the secondary scale 2 is rotated relative to the primary scale 1 at a certain angle so that the third circular block 52 overlaps with the first circular block 42. The positioning pin 6 passes through the first positioning hole on the first circular block 42 and the second positioning hole on the third circular block 52 to ensure that the distances of the first circular block 42 and the third circular block 52 from the rotation axes of the primary scale 1 and the secondary scale 2 are the same. If the positioning pin 6 cannot pass through both the first positioning hole on the first circular block 42 and the second positioning hole on the third circular block 52 simultaneously, it indicates that the moving distances of the first slider 4 and the second slider 5 are different, and it needs to be adjusted so that the positioning pin 6 can pass through both the first and second positioning holes simultaneously.

[0041] Optionally, the positioning pin 6 includes a pin shaft portion 61 and a gripping portion 62 connected to each other. A threaded hole is provided at one end of the main scale 1 away from the rotation axis of the main scale 1 and the secondary scale 2. The pin shaft portion 61 is used for threaded connection to the threaded hole.

[0042] In this embodiment, in conjunction with the appendix Figure 4 As shown, the positioning pin 6 includes a pin shaft portion 61 and a grip portion 62 connected to each other. The pin shaft portion 61 can be threadedly connected to a threaded hole at the end of the main scale 1 away from the rotation axis of the main scale 1 and the auxiliary scale 2. When needed, the positioning pin 6 can be removed from the main scale 1 by rotating the grip portion 62 by hand.

[0043] Optionally, the main ruler 1 includes a main ruler body 11 and a main ruler cover 12 covering the main ruler body 11. A main ruler guide rail is provided on the end face of the main ruler body 11 facing the main ruler cover 12. The first slider 4 is slidably connected to the main ruler guide rail. The display screen 3 is provided on the end face of the main ruler cover 12 away from the main ruler body 11.

[0044] In this embodiment, in conjunction with the appendix Figure 1 and attached Figure 3 As shown, the main scale cover 12 can be bolted to the upper end face of the main scale body 11 (see attached diagram). Figure 1 (in the positive Z-axis direction), a main scale guide rail is provided on the end face of the main scale body 11 facing the main scale cover 12, and the first slider 4 can be slidably connected to the main scale guide rail.

[0045] Optionally, a first spring plate 44 is provided on the end face of the first slider 4 facing the main scale guide rail, and the first spring plate 44 is used to provide damping for the movement of the first slider 4.

[0046] In this embodiment, in conjunction with the appendix Figure 2 As shown, a first spring plate 44 is provided on the end face of the first slider 4 facing the main scale guide rail. The first spring plate 44 can provide damping for the movement of the first slider 4. That is, the first slider 4 needs to apply a certain force to move along the main scale guide rail. The first spring plate 44 can prevent the first slider 4 from being displaced and affecting the measurement accuracy.

[0047] Optionally, the auxiliary ruler 2 includes an auxiliary ruler body 21 and an auxiliary ruler cover 22 covering the auxiliary ruler body 21. An auxiliary ruler guide rail is provided on the end face of the auxiliary ruler body 21 facing the auxiliary ruler cover 22, and the second slider 5 is slidably connected to the auxiliary ruler guide rail.

[0048] In this embodiment, in conjunction with the appendix Figure 1 As shown, the vernier scale cover 22 can be bolted to the upper end face of the vernier scale body 21 (see attached diagram). Figure 1 (in the positive Z-axis direction), a secondary scale guide rail is provided on the end face of the secondary scale body 21 facing the secondary scale cover 22, and the second slider 5 can be slidably connected to the secondary scale guide rail.

[0049] Optionally, a second spring sheet is provided on the end face of the second slider 5 facing the vernier guide rail, the second spring sheet being used to provide damping for the movement of the second slider 5.

[0050] In this embodiment, a second spring is provided on the end face of the second slider 5 facing the main scale guide rail. The second spring can provide damping for the movement of the second slider 5, that is, the second slider 5 needs to apply a certain force to move along the secondary scale guide rail. The second spring can prevent the second slider 5 from being displaced and affecting the measurement accuracy.

[0051] Optionally, a through groove is provided at one end of the main ruler 1, and a rotating shaft is provided in the through groove. The main ruler 1 is rotatably connected to the secondary ruler 2 through the rotating shaft, and the angle sensor is located at the through groove.

[0052] In this embodiment, the angle sensor can be installed at the through slot. The first fixed grid of the angle sensor can be installed inside the main scale cover 12, and the first moving grid can be fixedly connected to the secondary scale 2. By rotating the secondary scale 2 relative to the main scale 1, the first fixed grid and the first moving grid can be rotated relative to each other, and the rotation angle of the secondary scale 2 relative to the main scale 1 can be measured.

[0053] In addition, the main scale cover 12 is equipped with a second fixed grid of displacement sensor, and the first slider 4 is equipped with a second moving grid of displacement sensor. When the first slider 4 slides relative to the main scale 1, the displacement sensor can measure the displacement distance of the first slider 4 relative to the main scale 1.

[0054] Optionally, a function button is provided on the main scale cover 12, including a power on / off button 7, a reset button 8, and a confirmation button 9.

[0055] In this embodiment, the radius of the object being measured can be measured by following these steps:

[0056] S1, Press the power button 7 to turn on the power;

[0057] S2, align the main scale 1 and the auxiliary scale 2 completely, click the reset button 8 to calibrate the angle, press the confirmation button to activate the angle measurement function, and the display screen 3 will show the relative rotation angle between the main scale 1 and the auxiliary scale 2.

[0058] S3, move the first slider 4 to the zero position, click the reset button 8 again to calibrate the displacement, and press the confirmation button 9 again to activate the diameter measurement function;

[0059] S4, move the first slider 4 to an appropriate position along the main scale guide rail, and move the second slider 5 to a position at the same distance as the first slider 4 along the vernier scale guide rail. Use the positioning pin 6 to position the first circular block 42 and the third circular block 52 to ensure that the first circular block 42 and the third circular block 52 are at the same distance from the rotation axis of the main scale 1 and the vernier scale 2.

[0060] S5, align the main scale 1 and the secondary scale 2 perpendicular to the axis of the object being measured, bring the first circular block 42 and the second circular block 43 of the first slider 4 on the main scale 1 to the surface of the object being measured, and bring the third circular block and the fourth circular block of the second slider 5 on the secondary scale 2 to the surface of the object being measured. At this time, the display screen 3 displays the diameter of the object being measured.

[0061] 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 at least one of that feature.

[0062] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A multifunctional measuring device, characterized by, The utility model relates to a kind of measuring ruler, controller and display screen (3), the controller is electrically connected with the display screen (3), and both are arranged on the measuring ruler, the measuring ruler includes mutually rotatingly connected main ruler (1) and vice ruler (2), and scale line is arranged on the main ruler (1) and / or the vice ruler (2), first slider (4) is slidably connected on the main ruler (1), second slider (5) is slidably connected on the vice ruler (2), the first slider (4) and the second slider (5) are respectively used to abut with measured object, angle sensor and displacement sensor are arranged on the measuring ruler, wherein the angle sensor is used to obtain the included angle of the main ruler (1) and the vice ruler (2) and feedback to the controller, the displacement sensor is used to obtain the distance of the first slider (4) and / or the second slider (5) relative to the rotating axis of the main ruler (1) and the vice ruler (2) and feedback to the controller, the controller is used to calculate the radial dimension of measured object according to the data detected by the angle sensor and the displacement sensor, the display screen (3) is used to display the data obtained by the angle sensor, the displacement sensor and the radial dimension of the measured object calculated by the controller;The first slider (4) includes first body (41), first circular block (42) and second circular block (43), the first body (41) is slidably connected on the main ruler (1), the first circular block (42) and the second circular block (43) are arranged on the side of the first body (41) close to the vice ruler (2) with interval, and the center line of the first circular block (42) and the second circular block (43) is parallel to the center line of the main ruler (1);The second slider (5) includes second body, third circular block (52) and fourth circular block (53), the second body is slidably connected on the vice ruler (2), the third circular block (52) and the fourth circular block (53) are arranged on the side of the second body close to the main ruler (1) with interval, and the center line of the third circular block (52) and the fourth circular block (53) is parallel to the center line of the vice ruler (2), the first circular block (42), the second circular block (43), the third circular block (52) and the fourth circular block (53) are used to abut on the measured object. The first circular block (42) is located on the side close to the rotating axis of the main ruler (1) and the vice ruler (2) relative to the second circular block (43), and first positioning hole is arranged at the center of the first circular block (42), the third circular block (52) is located on the side close to the rotating axis of the main ruler (1) and the vice ruler (2) relative to the fourth circular block (53), second positioning hole is arranged at the center of the third circular block (52), positioning pin (6) is detachably connected on the measuring ruler, the positioning pin (6) is used to be arranged in the first positioning hole and the second positioning hole, to position the first circular block (42) and the third circular block (52).

2. The multi-functional measuring device according to claim 1, characterized in that, The controller is used according to the formula: Calculate the radius R of the object being measured, where R is the radius of the object being measured; OB is the angle between the centerline of the main ruler (1) and the centerline of the secondary ruler (2); OB is a line segment on the centerline of the main ruler (1), where point O is the rotation axis of the main ruler (1) and the secondary ruler (2), and line segment O1B is the center of the object being measured. The perpendicular line to the center line of the main ruler (1); L is the line segment OB perpendicular to the line segment OB. The distance between them and the line segment OC and line segment The distance between them, where line segment OC is the center line of the vernier scale (2), and line segment The line segment is a straight line passing through the center of the first circular block (42) and the center of the second circular block (43). Let be a straight line passing through the center of the third circular block (52) and the center of the fourth circular block (53), wherein A point is a line segment and line segments The intersection, The point is the midpoint of the line connecting the center of the first circular block (42) and the center of the second circular block (43), and ; Point is the center of the first circular block (42); r is the radius of the first circular block (42).

3. The multi-functional measuring device according to claim 1, wherein ​ 4. The multi-functional measuring device according to claim 3, wherein The positioning pin (6) comprises a pin shaft part (61) and a holding part (62) connected with each other, and a threaded hole is formed at one end of the main ruler (1) away from the rotation axis of the main ruler (1) and the secondary ruler (2), and the pin shaft part (61) is used for being threadedly connected to the threaded hole.

5. The multi-functional measuring device according to claim 1, wherein The main ruler (1) comprises a main ruler body (11) and a main ruler upper cover (12) covered on the main ruler body (11), an end surface of the main ruler body (11) towards the main ruler upper cover (12) is provided with a main ruler guide rail, the first sliding block (4) is slidingly connected to the main ruler guide rail, and the display screen (3) is arranged on an end surface of the main ruler upper cover (12) away from the main ruler body (11).

6. The multi-functional measuring device according to claim 5, wherein A first elastic sheet (44) is arranged on an end surface of the first sliding block (4) towards the main ruler guide rail, and the first elastic sheet (44) is used for providing damping for movement of the first sliding block (4).

7. The multi-functional measuring device according to claim 1, wherein The secondary ruler (2) comprises a secondary ruler body (21) and a secondary ruler upper cover (22) covered on the secondary ruler body (21), an end surface of the secondary ruler body (21) towards the secondary ruler upper cover (22) is provided with a secondary ruler guide rail, and the second sliding block (5) is slidingly connected to the secondary ruler guide rail.

8. The multi-functional measuring device according to claim 7, characterized in that, A second elastic sheet is arranged on an end surface of the second sliding block (5) towards the secondary ruler guide rail, and the second elastic sheet is used for providing damping for movement of the second sliding block (5).

9. The multi-function measuring device according to any one of claims 1 to 8, characterized in that, One end of the main ruler (1) is provided with a through slot, a rotating shaft is arranged in the through slot, the main ruler (1) is rotationally connected with the secondary ruler (2) through the rotating shaft, and the angle sensor is arranged at the through slot.

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