Multifunctional measuring device

Abstract

The invention 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 both arranged on the measuring scale, the measuring scale comprises a main scale and an auxiliary scale which are rotatably connected with each other, and the main scale and / or the auxiliary scale are / is provided with scale marks. A first sliding block is connected to the main ruler in a sliding mode, a second sliding block is connected to the auxiliary ruler in a sliding mode, and the first sliding block and the second sliding block are used for being connected with a measured object in an abutting mode. And the display screen is used for displaying data acquired by the angle sensor and the displacement sensor and the radial size of the measured object calculated by the controller. Compared with the prior art, the multifunctional measuring device can be used as a ruler, an angle ruler and a diameter (radius) measuring ruler in a multifunctional mode, 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] The present invention relates to the technical field of measuring tools, in particular to a multifunctional measuring device. Background Art

[0002] Measuring tools are devices or instruments used to determine physical quantities. They can help obtain various types of data for analysis, comparison, or recording. There are many types of measuring tools, some of which are common: rulers for measuring length, protractors for measuring angles, and vernier calipers for measuring diameters.

[0003] However, the functions of existing measuring tools are relatively independent. For example, if distance measurement, angle measurement, and diameter measurement are performed separately, it is often necessary to carry multiple test tools at the same time during work, and the measuring tools need to be replaced multiple times during use, resulting in low measurement efficiency. Summary of the invention

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

[0005] The present invention provides a multifunctional measuring device, comprising: a measuring ruler, a controller and a display screen, wherein the controller is electrically connected to the display screen and both are arranged on the measuring ruler, the measuring ruler comprises a main ruler and a sub-rule which are rotatably connected to each other, and the main ruler and / or the sub-rule are provided with scale lines, the main ruler is slidably connected with a first slider, and the sub-rule is slidably connected with a second slider, the first slider and the second slider are respectively used to abut against a measured object, the measuring ruler is provided with an angle sensor and a displacement sensor, wherein the angle sensor is used to obtain the angle between the main ruler and the sub-rule and feed it back to the controller, the displacement sensor is used to obtain the distance of the first slider and / or the second slider relative to the rotation axis of the main ruler and the sub-rule and feed it back to the controller, the controller is used to calculate the radial size of the measured object according to the data detected by the angle sensor and the displacement sensor, and the display screen is used to display the data obtained by the angle sensor and the displacement sensor and the radial size of the measured object calculated by the controller.

[0006] The multifunctional measuring device provided by the present invention has the following beneficial effects compared with the prior art:

[0007] The multifunctional measuring device of the present invention integrates the functions of length measurement, angle measurement and radius measurement. Specifically, when length measurement is required, the reading can be performed through the scale lines set on the main ruler and / or the secondary ruler; when angle measurement is required, the secondary ruler can be rotated to the target angle relative to the main ruler, and the angle between the main ruler and the secondary ruler can be obtained through the angle sensor and displayed in real time on the display screen, which is convenient for data reading; when radius measurement is required, the secondary ruler is first rotated to a certain angle relative to the main ruler, and then the first slider and the second slider are moved to the vicinity of the measured object and abutted against the measured object together, wherein the moving distances of the first slider and the second slider are the same, and at this time, the controller can calculate the radius of the measured object according to the data detected by the angle sensor and the displacement sensor, and display it in real time on the display screen, which is convenient for data reading. Compared with the prior art, the multifunctional measuring device of the present invention can be used as a ruler, an angle ruler and a diameter (radius) measuring ruler for multifunctional use, is easy for staff to carry and store, can reduce the time of changing measuring tools during measurement work, and improve 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 circular block and the second circular block are spaced apart on a side of the first body close to the secondary scale, and a line connecting the centers of the first circular block and the second circular block is parallel to a 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 circular block and the fourth circular block are spaced apart on a side of the slider body close to the main scale, and a line connecting the centers of the third circular block and the fourth circular block is parallel to a center line of the secondary scale, and the first circular block, the second circular block, the third circular block and the fourth circular block are used to jointly abut against the object to be measured.

[0009] Optionally, the controller is configured to: Calculate the radius R of the measured object, where: R is the radius of the measured object; θ is the angle between the center line of the main scale and the center line of the secondary scale; OB is a line segment on the center line of the main scale, where point O is the rotation axis of the main scale and the secondary scale, and line segment O1B is a perpendicular line from the center point O1 of the measured object to the center line 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 rotation axis of the secondary scale. The center line of the ruler, line segment O'B' is a straight line passing through the center of the first circular block and the center of the second circular block, line segment O'C' is a straight line passing through the center of the third circular block and the center of the fourth circular block, wherein 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 and the center of the second circular block, and O1B'⊥O'B'; point O2 is the center of the first circular block; r is the radius of the first circular block.

[0010] Optionally, the first circular block is located on a side close 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 a side close 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 ruler, and the positioning pin is used to penetrate 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 comprises a pin shaft portion and a holding portion which are connected to each other, 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 to be threadedly connected to the threaded hole.

[0012] Optionally, the main scale includes a main scale body and a main scale upper cover arranged on the main scale body, a main scale guide rail is arranged on the end surface of the main scale body facing the main scale upper cover, the first slider is slidably connected to the main scale guide rail, and the display screen is arranged on the end surface of the main scale upper cover facing away from the main scale body.

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

[0014] Optionally, the secondary ruler includes a secondary ruler body and a secondary ruler upper cover arranged on the secondary ruler body, the end surface of the secondary ruler body facing the secondary ruler upper cover is provided with a secondary ruler guide rail, and the second sliding block is slidably connected to the secondary ruler guide rail.

[0015] Optionally, a second elastic sheet is provided on the end surface of the second slider facing the secondary scale guide rail, and the second elastic sheet is used to provide damping for the movement of the second slider.

[0016] Optionally, a through slot is formed at one end of the main scale, and a rotating shaft is disposed in the through slot, the main scale is rotatably connected to the secondary scale via the rotating shaft, and the angle sensor is disposed at the through slot. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 is a schematic structural diagram of a first sliding block according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic structural diagram of a first sliding block installed on a main scale body according to an embodiment of the present invention;

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

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

[0022] Description of reference numerals:

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

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] In the description of the present invention, the directions or positional relationships indicated by “up”, “down”, “left”, “right”, “top”, “bottom”, “front”, “back”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment" and "one implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0028] Moreover, the Z axis in the drawings represents the vertical direction, that is, the up and down position, and the positive direction of the Z axis (that is, the direction of the arrow of the Z axis) represents the top, and the negative direction of the Z axis (that is, the direction opposite to the positive direction of the Z axis) represents the bottom.

[0029] It should also be noted that the aforementioned Z-axis representation is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] like Figures 1 to 2 As shown, the multifunctional measuring device of the embodiment of the present invention includes: a measuring ruler, a controller and a display screen 3, wherein the controller is electrically connected to the display screen 3 and both are arranged on the measuring ruler, the measuring ruler includes a main ruler 1 and a sub-rule 2 which are rotatably connected to each other, and the main ruler 1 and / or the sub-rule 2 are provided with scale lines, the main ruler 1 is slidably connected with a first slider 4, and the sub-rule 2 is slidably connected with a second slider 5, the first slider 4 and the second slider 5 are respectively used to abut against the object to be measured, the measuring ruler is provided with an angle sensor and a displacement sensor, wherein the angle sensor is used to obtain the angle between the main ruler 1 and the sub-rule 2 and feed it back 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 rotation axis of the main ruler 1 and the sub-rule 2 and feed it back to the controller, the controller is used to calculate the radial size of the object to be measured according to the data detected by the angle sensor and the displacement sensor, and the display screen 3 is used to display the data obtained by the angle sensor and the displacement sensor and the radial size of the object to be measured calculated by the controller.

[0031] In this embodiment, the length measurement function, the angle measurement function and the radius measurement function are integrated. Specifically, when the length measurement is required, the reading can be performed through the scale lines set on the main ruler 1 and / or the secondary ruler 2; when the angle measurement is required, the secondary ruler can be rotated to the target angle relative to the main ruler, and the angle between the main ruler and the secondary ruler can be obtained by the angle sensor and displayed in real time on the display screen, which is convenient for data reading; when the radius measurement is required, the secondary ruler is first rotated to a certain angle relative to the main ruler, and then the first slider and the second slider are moved to the vicinity of the measured object and abutted against the measured object together, wherein the moving distance of the first slider and the second slider is the same, and at this time, the controller can calculate the radius of the measured object according to the data detected by the angle sensor and the displacement sensor, and display it in real time on the display screen, which is convenient for data reading. Compared with the prior art, the multifunctional measuring device of the present invention can be used as a ruler, an angle ruler and a diameter (radius) measuring ruler, which is easy for the staff to carry and store, can reduce the time of changing the measuring tool during the measurement work, and improve the 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 scale 1, the first circular block 42 and the second circular block 43 are spaced apart on the side of the first body 41 close to the secondary scale 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 scale 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 scale 2, the third circular block 52 and the fourth circular block 53 are spaced apart on the side of the slider body close to the main scale 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 scale 2, and 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 against the object to be measured together.

[0033] In this embodiment, combined with the attached Figure 1 and attached Figure 2As shown, the first body 41 can be a rectangular block structure, which can be slidably connected to the main scale 1, and a first circular block 42 and a second circular block 43 are spaced apart on the side of the first body 41 close to the secondary scale 2, wherein the overall structure of the second slider 5 is the same as the first slider 4; similarly, the second body 41 can also be a rectangular block structure, which can be slidably connected to the secondary scale 2, and a third circular block 52 and a fourth circular block 53 are spaced apart on the side of the second body close to the main scale 1, wherein 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 jointly abut against the outer peripheral wall of the object to be measured.

[0034] Optionally, the controller is configured to: Calculate the radius R of the measured object, where: R is the radius of the measured object; θ is the angle between the center line of the main scale 1 and the center line of the secondary scale 2; OB is a line segment on the center line of the main scale 1, where point O is the rotation axis of the main scale 1 and the secondary scale 2, and line segment O1B is a perpendicular line from the center point O1 of the measured object to the center line of the main scale 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 center line of the secondary scale 2, and line segment O'B' is the perpendicular line from the center point O1 of the measured object to the center line of the main scale 1. A straight line (O′B′ / / OB) passes through the center of the first circular block 42 and the center of the second circular block 43, and a line segment O'C' is a straight line (O′C′ / / OC) passing through the center of the third circular block 52 and the center of the fourth circular block 53, wherein 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; and 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, Figure 5 As shown, the principle of the multifunctional measuring device for testing the radius is: using an angle sensor to measure the angle θ between the main scale 1 and the secondary scale 2 (the angle between the center line of the main scale 1 and the center line of the secondary scale 2), and calculating the radius of the secondary scale 2 according to 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 center line of the main scale 1. Figure 5 The distance of the middle straight line OA is:

[0036] Use a displacement sensor to measure the distance of the straight line OB. According to the geometric relationship OB=OA+AB, we can calculate According to the geometric relationship of rectangles,

[0037] According to trigonometric functions, It can be calculated that

[0038] According to the characteristics of right triangle, we know that (O1B′) 2 +(O2B′) 2 =(R+r) 2 , we can calculate Among them, OB, θ and O2B′ are all known quantities, and L is a fixed dimension and can be regarded as a known quantity. 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 a side close to the rotation axis of the main scale 1 and the secondary 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 a side close to the rotation axis of the main scale 1 and the secondary 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 ruler, and the positioning pin 6 is used to penetrate 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, combined with the attached Figure 1 As shown, the main scale 1 and the auxiliary scale 2 are up and down (attached Figure 1 The secondary scale 2 is connected to the main scale 1 by a rotating shaft, and the secondary scale 2 is located below the main scale 1. The 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 axis of the main scale 1 and the secondary scale 2. Specifically, the first slider 4 is moved to an appropriate position along the main scale 1, and the second slider 5 is moved to a position at the same distance as the first slider 4 along the secondary scale 2. The secondary scale 2 is rotated relative to the main scale 1 by a certain angle so that the third circular block 52 overlaps with the first circular block 42 from top to bottom. The positioning pin 6 is used to pass through the first positioning hole on the first circular block 42 and the second positioning hole on the third circular block 52, so 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 secondary scale 2. If the positioning pin 6 cannot pass through the first positioning hole on the first circular block 42 and the second positioning hole on the third circular block 52 at the same time, it means that the moving distances of the first slider 4 and the second slider 5 are different, and it is necessary to adjust the positioning pin 6 to pass through the first positioning hole and the second positioning hole at the same time.

[0041] Optionally, the positioning pin 6 includes a pin shaft portion 61 and a holding portion 62 connected to each other, and 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, and the pin shaft portion 61 is used to be threadedly connected to the threaded hole.

[0042] In this embodiment, combined with the attached Figure 4 As shown, the positioning pin 6 includes a pin shaft portion 61 and a holding portion 62 that are connected to each other. The pin shaft portion 61 can be threadedly connected to a threaded hole at one end of the main scale 1 away from the rotation axis of the main scale 1 and the secondary scale 2. When needed, the holding portion 62 can be rotated manually to remove the positioning pin 6 from the main scale 1.

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

[0044] In this embodiment, combined with the attached Figure 1 and attached Figure 3 As shown, the main ruler cover 12 can be connected to the upper end surface of the main ruler body 11 (attached Figure 1 A main scale guide rail is provided on the end surface of the main scale body 11 facing the main scale upper cover 12, and the first sliding block 4 can be slidably connected to the main scale guide rail.

[0045] Optionally, a first elastic sheet 44 is provided on the end surface of the first sliding block 4 facing the main scale guide rail, and the first elastic sheet 44 is used to provide damping for the movement of the first sliding block 4 .

[0046] In this embodiment, combined with the attached Figure 2 As shown, a first spring piece 44 is provided on the end surface of the first slider 4 facing the main scale guide rail, wherein the first spring piece 44 can provide damping for the movement of the first slider 4, that is, the first slider 4 needs to exert a certain force to move along the main scale guide rail, and the first spring piece 44 can prevent the first slider 4 from being displaced and affecting the measurement accuracy.

[0047] Optionally, the secondary ruler 2 includes a secondary ruler body 21 and a secondary ruler upper cover 22 covered on the secondary ruler body 21, and a secondary ruler guide rail is provided on the end surface of the secondary ruler body 21 facing the secondary ruler upper cover 22, and the second slider 5 is slidably connected to the secondary ruler guide rail.

[0048] In this embodiment, combined with the attached Figure 1 As shown, the secondary ruler cover 22 can be connected to the upper end surface of the secondary ruler body 21 (attached Figure 1 A secondary ruler guide rail is provided on the end surface of the secondary ruler body 21 facing the secondary ruler upper cover 22, and the second sliding block 5 can be slidably connected to the secondary ruler guide rail.

[0049] Optionally, a second elastic sheet is provided on the end surface of the second slider 5 facing the secondary scale guide rail, and the second elastic sheet is used to provide damping for the movement of the second slider 5 .

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

[0051] Optionally, a through slot is formed at one end of the main scale 1, and a rotating shaft is disposed in the through slot, the main scale 1 is rotatably connected to the secondary scale 2 via the rotating shaft, and the angle sensor is disposed at the through slot.

[0052] In this embodiment, the angle sensor can be installed at the through groove, the first fixed grid of the angle sensor can be installed in the main scale upper cover 12, the first moving grid can be fixedly connected to the secondary scale 2, and the secondary scale 2 and the main scale 1 are rotated relative to each other, so that the first fixed grid and the first moving grid rotate 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 provided with a second fixed grid of the displacement sensor, and the first slider 4 is provided with a second moving grid of the displacement sensor. When the first slider 4 and the main scale 1 slide relative to each other, the displacement sensor can measure the displacement distance of the first slider 4 relative to the main scale 1.

[0054] Optionally, function buttons are provided on the main ruler cover 12 , and the function buttons include a power button 7 , a reset button 8 and a confirmation button 9 .

[0055] In this embodiment, the radius of the object to be measured can be measured according to the following steps:

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

[0057] S2, completely overlap the main ruler 1 and the auxiliary ruler 2, 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 display the relative rotation angle between the main ruler 1 and the auxiliary ruler 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 along the main scale guide to an appropriate position, move the second slider 5 along the secondary scale guide to a position at the same distance as the first slider 4, and 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 secondary scale 2.

[0060] S5, make the main scale 1 and the auxiliary scale 2 perpendicular to the axis of the object to be measured, make the first circular block 42 and the second circular block 43 of the first slider 4 on the main scale 1 contact the surface of the object to be measured, and make the third circular block and the fourth circular block of the second slider 5 on the auxiliary scale 2 contact the surface of the object to be measured, and then the display screen 3 displays the diameter of the object to be measured.

[0061] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0062] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A multifunctional measuring device, It is characterized in that include: A measuring ruler, a controller and a display screen (3), wherein the controller is electrically connected to the display screen (3) and both are arranged on the measuring ruler, the measuring ruler comprises a main ruler (1) and a secondary ruler (2) which are rotatably connected to each other, and scale lines are arranged on the main ruler (1) and / or the secondary ruler (2), the main ruler (1) is slidably connected to a first slider (4), and the secondary ruler (2) is slidably connected to a second slider (5), the first slider (4) and the second slider (5) are respectively used to abut against a measured object, and the measuring ruler is provided with an angle sensor and a displacement sensor, wherein the angle sensor The device is used to obtain the angle between the main scale (1) and the secondary scale (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 scale (1) and the secondary scale (2) and feed it back to the controller; the controller is used to calculate the radial size of the object to be measured based on the data detected by the angle sensor and the displacement sensor; and the display screen (3) is used to display the data obtained by the angle sensor and the displacement sensor and the radial size of the object to be measured calculated by the controller.

2. The multifunctional measuring device according to claim 1, It is characterized in that The first slider (4) comprises 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 scale (1); the first circular block (42) and the second circular block (43) are arranged at intervals on a side of the first body (41) close to the secondary scale (2); and a line connecting the centers of the first circular block (42) and the second circular block (43) is parallel to a center line of the main scale (1); the second slider (5) comprises a second body, a third circular block (52 ) and a fourth circular block (53), the second body is slidably connected to the secondary scale (2), the third circular block (52) and the fourth circular block (53) are spaced apart on a side of the slider body close to the main scale (1), and a line connecting the centers of the third circular block (52) and the fourth circular block (53) is parallel to a center line of the secondary scale (2), and 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 against the object to be measured together.

3. The multifunctional measuring device according to claim 2, It is characterized in that The controller is used according to the formula: Calculate the radius R of the object to be measured, where: R is the radius of the object to be measured; θ is the angle between the center line of the main scale (1) and the center line of the secondary scale (2); OB is a line segment on the center line of the main scale (1), wherein point O is the rotation axis of the main scale (1) and the secondary scale (2), and line segment O 1 B is the center of the object being measured O 1 A perpendicular line to the center line of the main scale (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', wherein line segment OC is the center line of the secondary scale (2), line segment O'B' is a straight line passing through the center of the first circular block (42) and the center of the second circular block (43), 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), wherein 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 point O' 1 B'⊥O'B'; O 2 Point is the center of the first circular block (42); r is the radius of the first circular block (42).

4. The multifunctional measuring device according to claim 2, It is characterized in that The first circular block (42) is located at a side close to the rotation axis of the main scale (1) and the secondary 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 at a side close to the rotation axis of the main scale (1) and the secondary 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 ruler, and the positioning pin (6) is used to penetrate the first positioning hole and the second positioning hole to position the first circular block (42) and the third circular block (52).

5. The multifunctional measuring device according to claim 4, It is characterized in that The positioning pin (6) comprises a pin shaft portion (61) and a gripping portion (62) which are 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 auxiliary scale (2). The pin shaft portion (61) is used to be threadedly connected to the threaded hole.

6. The multifunctional measuring device according to claim 1, It is characterized in that The main ruler (1) comprises a main ruler body (11) and a main ruler upper cover (12) arranged on the main ruler body (11); a main ruler guide rail is arranged on the end surface of the main ruler body (11) facing the main ruler upper cover (12); the first sliding block (4) is slidably connected to the main ruler guide rail; and the display screen (3) is arranged on the end surface of the main ruler upper cover (12) facing away from the main ruler body (11).

7. The multifunctional measuring device according to claim 6, It is characterized in that A first elastic sheet (44) is arranged on the end surface of the first sliding block (4) facing the main scale guide rail, and the first elastic sheet (44) is used to provide damping for the movement of the first sliding block (4).

8. The multifunctional measuring device according to claim 1, It is characterized in that The secondary ruler (2) comprises a secondary ruler body (21) and a secondary ruler upper cover (22) arranged on the secondary ruler body (21); a secondary ruler guide rail is arranged on the end surface of the secondary ruler body (21) facing the secondary ruler upper cover (22); and the second sliding block (5) is slidably connected to the secondary ruler guide rail.

9. The multifunctional measuring device according to claim 8, It is characterized in that A second elastic sheet is arranged on the end surface of the second sliding block (5) facing the secondary scale guide rail, and the second elastic sheet is used to provide damping for the movement of the second sliding block (5).

10. The multifunctional measuring device according to any one of claims 1 to 9, It is characterized in that A through slot is provided at one end of the main scale (1), and a rotating shaft is arranged in the through slot. The main scale (1) is rotatably connected to the auxiliary scale (2) via the rotating shaft, and the angle sensor is arranged at the through slot.

Images