Multifunctional measuring instrument

Abstract

The utility model discloses a multifunctional measuring instrument, which relates to the technical field of mechanical measurement and comprises a positioning circular plate with a preset radius value, and the arc-shaped peripheral wall of the positioning circular plate is a positioning wall. The first clamping foot and the second clamping foot are both connected to the positioning circular plate with the vertical line, passing through the circle center, of the positioning circular plate as the rotating center line. The clamping pin I and the clamping pin II are arranged along the radial direction of the positioning circular plate; one side end of the clamping pin I is a knife edge I, and one side end of the clamping pin II is a knife edge II; when the first clamping foot and the second clamping foot are opened, the first knife edge, the second knife edge and the positioning wall can abut against the outer wall face of the spherical or circular workpiece to be detected. Preset distance values are formed between the first knife edge and the rotating center line and between the second knife edge and the rotating center line; the angle measuring device is connected with the first clamping foot and the second clamping foot to detect the field angle value, and then the arc radius or diameter of the workpiece to be measured is determined. The device has an angle measurement function and can be used for measuring the radiuses or diameters of arc surfaces of incomplete spherical, circular and cylindrical workpieces.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical measurement, in particular to a multifunctional measuring instrument. Background Art

[0002] A measuring ruler is a commonly used measuring tool, which can be divided into a length measuring ruler, an angle measuring ruler, a diameter measuring ruler, etc. according to different detection contents; with the development of technology, more and more intelligent measuring rulers have emerged. By assembling sensors and electronic display devices on the measuring ruler, data can be processed and read more conveniently and intelligently; and more and more multifunctional measuring instruments with functions such as length, angle, and diameter measurement have gradually entered the market; among them, for workpieces such as cylinders and spheres, it is usually necessary to use a vernier caliper or a micrometer to clamp at the outer diameter to be measured to detect the diameter of the measured workpiece. However, for the measurement of the arc radius or diameter of non-complete spherical, circular, and cylindrical workpieces without diameter positioning points, ordinary measuring instruments are not applicable.

[0003] Therefore, how to provide a multifunctional measuring instrument with an angle measuring function, which can accurately measure the arc radius or diameter of non-complete spherical, circular, and cylindrical workpieces, and has the characteristics of simple structure and low manufacturing cost is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model

[0004] In view of this, the utility model provides a multifunctional measuring instrument, aiming to solve the technical problem that the above-mentioned traditional measuring instrument is not applicable to the measurement of the arc radius or diameter of non-complete spherical, circular, and cylindrical workpieces.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] The utility model provides a multifunctional measuring instrument, including:

[0007] A positioning circular plate, the positioning circular plate has a preset radius value B, and its circular arc-shaped outer peripheral wall is a positioning wall that can be in contact with and position the outer wall surface of the spherical or circular workpiece to be measured;

[0008] Strip-shaped clamping feet one and two, both the clamping feet one and two take the perpendicular line passing through the center of the circle of the positioning circular plate as the rotation center line and are connected to the positioning circular plate; both the clamping feet one and two are arranged along the radial direction of the positioning circular plate;

[0009] One end of the first clamping leg along the rotation direction is a first cutting edge, and one end of the second clamping leg along the rotation direction is a second cutting edge. When the first clamping leg and the second clamping leg rotate and open around the rotation center line, the first cutting edge, the second cutting edge and the positioning wall can simultaneously abut and be positioned on the outer wall surface of the spherical or circular workpiece to be measured to determine the tangent points at three different positions. There is a preset spacing value A between both the first cutting edge and the second cutting edge and the rotation center line.

[0010] An angle measuring device, which is connected to the first clamping leg and the second clamping leg to detect the included angle value α between the first clamping leg and the second clamping leg, and thus the arc radius value R or the diameter value D of the spherical or circular workpiece to be measured can be determined by combining the preset spacing value A and the preset radius value B.

[0011] When measuring the included angle with the multifunctional measuring instrument of the present utility model, the first cutting edge of the first clamping leg and the second cutting edge of the second clamping leg are used to accurately position the side surface to be measured of the workpiece. The included angle value α between the first clamping leg and the second clamping leg can be detected and determined by the angle measuring device, and then the angle value of the workpiece to be measured can be obtained. When measuring the radius or diameter of a sphere or a cylinder, the first cutting edge, the second cutting edge and the positioning wall are simultaneously abutted and positioned on the outer wall surface of the spherical or circular workpiece to be measured to determine the tangent points at three different positions. The angle measuring device measures the included angle value α, and the arc radius value R or the diameter value D of the spherical or circular workpiece to be measured can be calculated and determined by combining the preset spacing value A and the preset radius value B. For an incomplete sphere or cylinder, as long as the first cutting edge, the second cutting edge and the positioning wall can be simultaneously tangent and positioned on the outer wall surface of the incomplete spherical or circular workpiece to be measured, that is, the tangent points at three different positions are determined, the measurement of the arc radius value R or the diameter value D can be completed. The present utility model realizes the measurement of the diameter of an incomplete spherical or circular workpiece, and can also measure the angle of the workpiece to be measured. The preset spacing value A and the preset radius value B of the present utility model can be guaranteed through the precision machining of parts. The included angle value α can be accurately determined by the angle measuring device. The overall structure is simple and compact, convenient and practical, and the operation is very simple. The indirect measurement parameter is only the included angle value α, which greatly improves the measurement accuracy and measurement efficiency.

[0012] As a further improvement of the above technical solution, angle markings are arranged on the circumferential side of the plate surface of the positioning circular plate along the circumferential direction of the positioning circular plate. A first reading baseline parallel to the first cutting edge is arranged on the first clamping leg along the length direction. A second reading baseline parallel to the second cutting edge is arranged on the second clamping leg along the length direction. Both the first reading baseline and the second reading baseline are arranged corresponding to the angle markings, and the extension lines of both intersect with the rotation center line to cooperate with reading the angle value between the first clamping leg and the second clamping leg.

[0013] The beneficial effects of the above technical solution are as follows: By reading the positions of the reading baseline one and the reading baseline two on the angle scale line, the angle value between the first clamping foot and the second clamping foot can be obtained, and then the opening angle value between the first clamping foot and the second clamping foot can be obtained by calculating the angle difference.

[0014] As a further improvement of the above technical solution, the positioning circular plate, the first clamping foot, and the second clamping foot are all transparent plates;

[0015] Or, an observation window is provided at the position corresponding to the angle scale line on the plate surface of the first clamping foot and / or the second clamping foot.

[0016] The beneficial effects of the above technical solution are as follows: The transparent positioning circular plate, the first clamping foot, and the second clamping foot are more convenient for observing and reading the angle values corresponding to the reading baseline one and the reading baseline two; or an observation window for observing the angle scale line is provided on the plate surface of the first clamping foot and / or the second clamping foot, which can also achieve the purpose of facilitating the direct observation of the angle value.

[0017] As a further improvement of the above technical solution, the fixed body of the first clamping foot is connected to the circumference of the positioning circular plate; the second clamping foot corresponds to one side plate surface of the positioning circular plate, and one end of it is hinged at the center of the positioning circular plate and can be rotated to overlap on the first clamping foot.

[0018] The beneficial effects of the above technical solution are as follows: The first clamping foot is integrally connected to the positioning circular plate, and the structure is further simplified. When measuring the opening angle between the first clamping foot and the second clamping foot, only the angular displacement of the second clamping foot relative to the first clamping foot needs to be determined.

[0019] As a further improvement of the above technical solution, a length measurement scale line is provided along the length direction on the first clamping foot and / or the second clamping foot.

[0020] The beneficial effects of the above technical solution are as follows: The length measurement scale line on the first clamping foot and / or the second clamping foot can be used to measure the length of the workpiece, further enriching the measurement function of the instrument.

[0021] As a further improvement of the above technical solution, the angle measurement device includes an angular displacement sensor and an electronic display; the angular displacement sensor is connected to the first clamping foot and the second clamping foot to detect the opening angle value α; the electronic display is electrically connected to the angular displacement sensor to collect and display the opening angle value α, and can calculate and display the arc radius value R or the diameter value D of the workpiece to be measured uniquely determined by the three tangent points in combination with the built-in known parameters. The known parameters are the preset spacing value A and the preset radius value B.

[0022] The beneficial effects of the above technical solution are as follows: The angular displacement sensor improves the measurement accuracy of the opening angle between the first and second clamping feet, enhancing the convenience of angle measurement; the electronic display can calculate and obtain the arc radius value R or diameter value D of the workpiece to be measured based on the opening angle value α and the pre-built known parameters (preset spacing value A and preset radius value B) through the built-in program, and then display it, improving the measurement accuracy and efficiency of the arc radius value R or diameter value D of the workpiece.

[0023] As a further improvement of the above technical solution, the angular displacement sensor is a capacitance grating angular displacement sensor.

[0024] The beneficial effects of the above technical solution are as follows: The capacitance grating angular displacement sensor is selected as the angular displacement sensor, which has low cost and high measurement accuracy.

[0025] As a further improvement of the above technical solution, the electronic display includes a display screen and a controller.

[0026] The beneficial effects of the above technical solution are as follows: The controller is used to collect data from the angular displacement sensor, calculate the measured opening angle value α and the measured arc radius value R or diameter value D of the workpiece to be measured based on the built-in known parameters, and send the measurement result information to the display screen for display; users can quickly obtain the measurement result through the opening angle value α and the arc radius value R or diameter value D displayed on the display screen.

[0027] It can be seen from the above technical solutions that compared with the prior art, the present utility model discloses a multifunctional measuring instrument, which has the following advantages and beneficial effects:

[0028] 1. By simultaneously making the cutting edge one of the first clamping foot, the cutting edge two of the second clamping foot and the positioning wall of the positioning circular plate tangent to the outer wall surface of the workpiece to be measured to determine the tangent points at three different positions, the present utility model can uniquely determine the arc radius value R or diameter value D of the workpiece to be measured. The indirect measurement parameters involved are only the preset spacing value A, the preset radius value B and the opening angle value α, and both the preset spacing value A and the preset radius value B can be guaranteed by the structural accuracy of the instrument components themselves, so that the indirect measurement parameter is only the opening angle value α, greatly improving the measurement accuracy and the convenience of measurement.

[0029] 2. The present utility model is not only applicable to the measurement of the diameter of spherical or circular workpieces, but also applicable to the measurement of the diameter of non-complete spherical or circular workpieces, and can also measure the angle of the workpiece to be measured; the instrument has a compact structure, low manufacturing cost, is convenient and practical, and has a simple operation, and has good popularization and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0031] Figure 1 Overall structural schematic diagram of a multi-functional measuring instrument of the present invention in the state of measuring the radius or directly measuring;

[0032] Figure 2 Schematic diagram of the measuring principle of a multi-functional measuring instrument of the present invention;

[0033] Figure 3 Partial enlarged schematic diagram of the measuring state of a multi-functional measuring instrument of the present invention;

[0034] In the figure: 1. positioning circular plate; 11. positioning wall; 2. first clamping foot; 21. first cutting edge; 22. first reading baseline; 3. second clamping foot; 31. second cutting edge; 32. second reading baseline; 4. angle measuring device; 41. angle scale line; 42. angular displacement sensor; 43. electronic display; 5. spherical or circular workpiece to be measured. Detailed implementation manners

[0035] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0038] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] As Figures 1 to 3 shown, a multifunctional measuring instrument includes:

[0040] A positioning circular plate 1, the positioning circular plate 1 has a preset radius value B, and its circular arc-shaped outer peripheral wall is a positioning wall 11 that can contact and position the outer wall surface of a spherical or circular workpiece 5 to be measured;

[0041] A strip-shaped plate-like first clamping leg 2 and a second clamping leg 3, both the first clamping leg 2 and the second clamping leg 3 take the perpendicular line passing through the center of the positioning circular plate 1 as the rotation center line and are connected to the positioning circular plate 1; both the first clamping leg 2 and the second clamping leg 3 are arranged along the radial direction of the positioning circular plate 1;

[0042] One end of the first clamping leg 2 along the rotation direction is a first cutting edge 21, and one end of the second clamping leg 3 along the rotation direction is a second cutting edge 31; when the first clamping leg 2 and the second clamping leg 3 rotate and open around the rotation center line, the first cutting edge 21, the second cutting edge 31 and the positioning wall 11 can simultaneously abut and position on the outer wall surface of the spherical or circular workpiece 5 to be measured to determine three tangent points 51 at different positions; both the first cutting edge 21 and the second cutting edge 31 have a preset spacing value A from the rotation center line;

[0043] An angle measuring device 4, the angle measuring device 4 is connected to the first clamping leg 2 and the second clamping leg 3 to detect the included angle value α between the first clamping leg 2 and the second clamping leg 3, and then the arc radius value R or the diameter value D of the spherical or circular workpiece 5 to be measured can be determined in combination with the preset spacing value A and the preset radius value B.

[0044] When measuring the included angle with a multifunctional measuring instrument according to this embodiment, the workpiece to be measured is accurately positioned on the side surface by the cutting edge 21 of the first clamping foot 2 and the cutting edge 31 of the second clamping foot 3. The included angle value α between the first clamping foot 2 and the second clamping foot 3 can be detected and determined by the angle measuring device 4, and then the angle value of the workpiece to be measured can be obtained; when measuring the radius or diameter of a sphere or a cylinder, the cutting edge 21, the cutting edge 31 and the positioning wall 11 are simultaneously abutted and positioned on the outer wall surface of the spherical or circular workpiece 5 to be measured to determine the tangent points 51 at three different positions. The angle measuring device 4 measures the included angle value α, and the arc radius value R or the diameter value D of the spherical or circular workpiece 5 to be measured can be calculated and determined by combining the preset spacing value A and the preset radius value B; for an incomplete sphere or cylinder, as long as the cutting edge 21, the cutting edge 31 and the positioning wall 11 can be simultaneously tangent and positioned on the outer wall surface 5 of the incomplete spherical or circular workpiece to be measured, that is, the tangent points 51 at three different positions are determined, and the measurement of the arc radius value R or the diameter value D can be completed. The utility model realizes the measurement of the diameter of an incomplete spherical or circular workpiece, and can also measure the angle of the workpiece to be measured; the preset spacing value A and the preset radius value B of the utility model can be guaranteed by the precision machining of parts, the included angle value α can be accurately determined by the angle measuring device 4, the overall structure is simple and compact, convenient and practical, and the operation is very simple; the indirect measurement parameter is only the included angle value α, which greatly improves the measurement accuracy and measurement efficiency.

[0045] Specifically, the positioning circular plate 1 can be any one of a circular plate, an annular plate, a semi-circular plate, and an arc-shaped plate, and can be designed according to needs.

[0046] In some embodiments, angle scale lines 41 are arranged on the circumferential side of the plate surface of the positioning circular plate 1 and along the circumferential direction of the positioning circular plate 1; a reading baseline 22 parallel to the cutting edge 21 is arranged on the first clamping foot 2 along the length direction; a reading baseline 32 parallel to the cutting edge 31 is arranged on the second clamping foot 3 along the length direction; both the reading baseline 22 and the reading baseline 32 are arranged corresponding to the angle scale lines 41, and the extension lines of both intersect with the rotation center line to cooperate with reading the angle value between the first clamping foot 2 and the second clamping foot 3.

[0047] By reading the positions of the reading baseline 22 and the reading baseline 32 on the angle scale lines 41, the angle value between the first clamping foot 2 and the second clamping foot 3 can be obtained, and then the included angle value between the first clamping foot 2 and the second clamping foot 3 can be obtained by calculating the angle difference.

[0048] In some embodiments, the positioning circular plate 1, the first clamping foot 2, and the second clamping foot 3 are all transparent plates; or, observation windows are arranged at the positions of the plate surfaces of the first clamping foot 2 and / or the second clamping foot 3 corresponding to the angle scale lines 41.

[0049] The transparent positioning circular plate 1, the first clamping leg 2 and the second clamping leg 3 are more convenient for observing and reading the angular values corresponding to the first reading baseline 22 and the second reading baseline 32; or, when the positioning circular plate 1, the first clamping leg 2 and the second clamping leg 3 are non-transparent plates, such as metal plates, an observation window for observing the angular marking line 41 is arranged on the plate surface of the first clamping leg 2 and / or the second clamping leg 3, and the purpose of facilitating the intuitive observation of the angular value can also be achieved.

[0050] Specifically, the angular marking line 41, the first reading baseline 22 and the second reading baseline 32 are all engraved lines made by engraving processing.

[0051] In some embodiments, the first clamping leg 2 is integrally connected to the circumferential side of the positioning circular plate 1 and extends radially along the positioning circular plate 1; the second clamping leg 3 corresponds to one side plate surface of the positioning circular plate 1, and one end of it is hinged at the center of the positioning circular plate 1 and can be rotated and overlapped on the first clamping leg 2.

[0052] The first clamping leg 2 is integrally connected to the positioning circular plate 1. The first clamping leg 2 serves as a fixed clamping leg, and the second clamping leg 3 serves as a movable clamping leg, further simplifying the structure; when measuring the opening angle between the first clamping leg 2 and the second clamping leg 3, only the angular value of the second clamping leg 3 needs to be determined to obtain its angular displacement relative to the first clamping leg 2.

[0053] Specifically, the first clamping leg 2 is integrally connected to the circumferential side of the positioning circular plate 1, so that the angular value of the first clamping leg 2 can be a determined value. The first clamping leg 2 can be positioned at the zero scale of the angular marking line 41. Then, only by reading the scale value corresponding to the second reading baseline 32 of the second clamping leg 3 on the angular marking line 41 can the opening angle value be directly determined.

[0054] In some embodiments, length measurement marking lines are arranged on the first clamping leg 2 and / or the second clamping leg 3 along the length direction.

[0055] Specifically, both the first clamping leg 2 and the second clamping leg 3 are standard rectangular plates with uniform thickness and strip shape. Among them, the first reading baseline 22 corresponds to the midline in the width direction of the first clamping leg 2, and the second reading baseline 32 corresponds to the midline in the width direction of the second clamping leg 3; the axis line of the hinge axis of the first clamping leg 2 and the second clamping leg 3 intersects with the midlines in their width directions.

[0056] The length measurement marking lines on the first clamping leg 2 and / or the second clamping leg 3 can be used to measure the length of the workpiece, further enriching the measurement function of the instrument.

[0057] In some embodiments, when the first clamping leg 2 and the second clamping leg 3 open, the radius or diameter of the spherical or circular workpiece 5 to be measured can only be measured when the circumferential side of the positioning circular plate 1 is between the first cutting edge 21 of the first clamping leg 2 and the second cutting edge 31 of the second clamping leg 3, which limits the radius measurement range of the measuring instrument; and when the circumferential side of the positioning circular plate 1 is between the first cutting edge 21 of the first clamping leg 2 and the second cutting edge 31 of the second clamping leg 3, it will limit the angle measurement of the workpiece to be measured with sharp corners by the measuring instrument; this limits the angle measurement range of the measuring instrument. The solution is: different positioning circular plates 1 with preset radius values B can be designed and manufactured to design measuring instruments of various specifications and ranges for users to choose from.

[0058] In some embodiments, the angle measuring device 4 includes an angular displacement sensor 42 and an electronic display 43; the angular displacement sensor 42 is connected to the first clamping leg 2 and the second clamping leg 3 to detect the opening angle value α; the electronic display 43 is electrically connected to the angular displacement sensor 42 to collect and display the opening angle value α, and can calculate and display the arc radius value R or diameter value D of the workpiece to be measured uniquely determined by three tangent points 51 in combination with the built-in known parameters. The known parameters are the preset spacing value A and the preset radius value B.

[0059] The angular displacement sensor 42 improves the measurement accuracy of the opening angle between the first clamping leg 2 and the second clamping leg 3 and improves the convenience of angle measurement; the electronic display 43 can calculate and process the arc radius value R or diameter value D of the workpiece to be measured according to the opening angle value α and the pre-built known parameters (preset spacing value A and preset radius value B) through the built-in program and display it, improving the measurement accuracy and efficiency of the arc radius value R or diameter value D of the workpiece.

[0060] In some embodiments, the angular displacement sensor 42 is a capacitive grating angular displacement sensor.

[0061] The capacitive grating angular displacement sensor is selected for the angular displacement sensor 42, which has low cost and high measurement accuracy. Other existing angular sensor products can also be selected for the angular displacement sensor 42 for assembly and use.

[0062] Specifically, the angular displacement sensor 42 is installed at the center of the positioning circular plate 1; the fixed grating plate of the angular displacement sensor 42 is installed on the side of the positioning circular plate 1 close to the second clamping leg 3, and the moving grating plate of the angular displacement sensor 42 is installed on the side of the second clamping leg 3 close to the positioning circular plate 1. The fixed grating plate and the moving grating plate are rotationally matched relative to each other to feedback the angle signal. The measurement principle of the angular displacement sensor 42 is the prior art and will not be elaborated here; the specific structure and installation layout of the angular displacement sensor 42 can refer to the prior art, such as Chinese Patent CN212963070U and Chinese Patent CN201016681Y.

[0063] In some embodiments, the electronic display 43 includes a display screen and a controller.

[0064] Specifically, the electronic display 43 is fixed on the surface of the first clamping leg 2 or the second clamping leg 3.

[0065] The controller is used to collect the data of the angular displacement sensor 42, calculate the measured included angle value α and the measured arc radius value R or diameter value D of the workpiece to be measured according to the built-in known parameters, and send the measurement result information to the display screen for display; the user can quickly obtain the measurement result through the included angle value α and the arc radius value R or diameter value D displayed on the display screen.

[0066] Specifically, the digital display angle gauge with a display screen is an existing product, such as the Fuji Mountain FJS digital display universal angle gauge (measurement range 0 - 360°, stainless steel ruler body), and the HaoLiang SK angle measuring ruler (measurement range 0 - 180°, resolution 0.1 degree). It should be noted that: in the present utility model, the preset radius value B, the preset spacing value A, and the preset radius value B of the positioning circular plate 1 are pre-stored in the controller in advance. After the controller collects the parameter included angle value α, the result value of the arc radius value R or diameter value D can be obtained through calculation and processing by a small program.

[0067] Another embodiment provides a measurement method for a multifunctional measuring instrument, including the following steps:

[0068] Step 1: When measuring the arc radius or diameter of any one of spherical, circular, non-complete spherical, and non-complete circular workpieces, make the cutting edge 21 of the first clamping leg 2, the cutting edge 31 of the second clamping leg 3, and the positioning wall 11 of the positioning circular plate 1 tangent to the outer wall surface of the workpiece to be measured at the same time to determine three tangent points 51 at different positions;

[0069] Step 2: According to the known parameters of the preset spacing value A and the preset radius value B, and combined with the included angle value α detected by the angle measuring device 4 between the first clamping leg 2 and the second clamping leg 3, calculate the arc radius value R or diameter value D of the workpiece to be measured.

[0070] Specifically, when only measuring the angle, the cutting edge 21 of the first clamping leg 2 and the cutting edge 31 of the second clamping leg 3 can be positioned and attached to the surface to be measured to detect the angle value of the angle to be measured.

[0071] In some embodiments, in Step 2, the calculation formula for the arc radius value R or diameter value D of the workpiece to be measured is:

[0072] Let the angle a be α / 2, that is, half of the included angle value α; the center point of the positioning circular plate 1 is point P; when the first clamping leg 2 and the second clamping leg 3 are opened, the intersection point of the cutting edge 21 and the cutting edge 31 is point Q, and at the same time, a perpendicular line is drawn from point Q to the reading baseline 22 or the reading baseline 32, and the perpendicular point is point F;

[0073] According to the sine theorem, it can be obtained that:

[0074] Meanwhile:

[0075] It can be obtained from the cosecant function that:

[0076] Based on the above formula, the radius of the workpiece to be measured can be calculated:

[0077] The diameter of the workpiece to be measured can be calculated

[0078] Wherein: A and B are known data; the angle a is the data measured by the angular displacement sensor; the data to be calculated are the radius R and diameter D of the workpiece to be measured.

[0079] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0080] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A multifunctional measuring instrument, characterized in that: include: A positioning circular plate (1), wherein the positioning circular plate (1) has a preset radius value B, and its arc-shaped outer peripheral wall is a positioning wall (11) capable of contacting and positioning the outer wall surface of a spherical or circular workpiece (5) to be measured; A first clamping foot (2) and a second clamping foot (3) in the shape of a long strip, wherein the first clamping foot (2) and the second clamping foot (3) are connected to the positioning circular plate (1) with a vertical line passing through the center of the positioning circular plate (1) as a rotation center line; the first clamping foot (2) and the second clamping foot (3) are arranged radially along the positioning circular plate (1); One side end of the first clamping foot (2) along the rotation direction is a knife edge (21), and one side end of the second clamping foot (3) along the rotation direction is a knife edge (31); when the first clamping foot (2) and the second clamping foot (3) rotate and open around the rotation center line, the first knife edge (21), the second knife edge (31) and the positioning wall (11) can simultaneously abut and position on the outer wall surface of the spherical or circular workpiece (5) to be measured to determine three tangent points (51) at different positions; the first knife edge (21) and the second knife edge (31) have a preset spacing value A with the rotation center line; An angle measuring device (4) is connected to the first clamping foot (2) and the second clamping foot (3) to detect the opening angle value α between the first clamping foot (2) and the second clamping foot (3), and then the arc radius value R or the diameter value D of the spherical or circular workpiece (5) to be measured can be determined in combination with a preset spacing value A and a preset radius value B.

2. A multifunctional measuring instrument according to claim 1, characterized in that: Angle markings (41) are arranged on the circumferential side of the plate surface of the positioning circular plate (1) and along the circumference of the positioning circular plate (1); a reading baseline 1 (22) parallel to the blade 1 (21) is arranged on the clamping foot 1 (2) along the length direction; a reading baseline 2 (32) parallel to the blade 2 (31) is arranged on the clamping foot 2 (3) along the length direction; the reading baseline 1 (22) and the reading baseline 2 (32) are both arranged corresponding to the angle markings (41) and their extension lines both intersect with the rotation center line, so as to cooperate in reading the angle values ​​of the clamping foot 1 (2) and the clamping foot 2 (3).

3. A multifunctional measuring instrument according to claim 2, characterized in that: The positioning circular plate (1), the first clamping foot (2) and the second clamping foot (3) are all transparent plates; Alternatively, an observation window is provided on the plate surface of the first clamping foot (2) and / or the second clamping foot (3) at a position corresponding to the angle marking line (41).

4. A multifunctional measuring instrument according to claim 2, characterized in that: The first clamping foot (2) is fixedly connected to the circumference of the positioning circular plate (1); the second clamping foot (3) corresponds to a side plate surface of the positioning circular plate (1), and one end of the clamping foot (3) is hinged at the center of the positioning circular plate (1) and can be rotatably overlapped on the first clamping foot (2).

5. A multifunctional measuring instrument according to claim 1, characterized in that: The first clamping foot (2) and / or the second clamping foot (3) are provided with length measurement markings along the length direction.

6. A multifunctional measuring instrument according to claim 1, characterized in that: The angle measuring device (4) comprises an angular displacement sensor (42) and an electronic display (43); the angular displacement sensor (42) is connected to the first clamping foot (2) and the second clamping foot (3) to detect the opening angle value α; the electronic display (43) is electrically connected to the angular displacement sensor (42) to acquire and display the opening angle value α, and can calculate and display the arc radius value R or diameter value D of the workpiece to be measured uniquely determined by the three tangent points (51) in combination with built-in known parameters, wherein the known parameters are the preset spacing value A and the preset radius value B.

7. A multifunctional measuring instrument according to claim 6, characterized in that: The angular displacement sensor (42) is a capacitive angular displacement sensor.

8. A multifunctional measuring instrument according to claim 6, characterized in that: The electronic display (43) comprises a display screen and a controller.

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