CN215338105U - Measuring device for measuring arc radius - Google Patents
Measuring device for measuring arc radius Download PDFInfo
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- CN215338105U CN215338105U CN202121372195.4U CN202121372195U CN215338105U CN 215338105 U CN215338105 U CN 215338105U CN 202121372195 U CN202121372195 U CN 202121372195U CN 215338105 U CN215338105 U CN 215338105U
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Abstract
The utility model discloses a measuring device for measuring the radius of a circular arc, which comprises: the digital display device comprises a radius gauge base and a digital display meter, wherein the radius gauge base is provided with an assembly table, two support legs respectively extend downwards and outwards from two sides of the assembly table, an included angle is formed between the two support legs, and the assembly table is provided with a through hole; the digital display meter comprises a dial plate, a fixed rod fixedly connected with the dial plate and a measuring rod sleeved in the fixed rod and elastically connected with the dial plate, the measuring rod can stretch relative to the fixed rod, the fixed rod penetrates through a through hole to enable the digital display meter to be fixedly installed on the radius gauge base, and the axis of the measuring rod is superposed with the angular bisector of an included angle formed by two supporting legs; the measuring device has an initial state, and the measuring rod is at an initial position at the moment; the measuring device also has a working state, at the moment, the two supporting legs and the measuring rod are respectively contacted with the arc surface, the position of the measuring rod is different from the initial position of the measuring rod, and the dial plate correspondingly displays the arc radius value. The measuring device can simply and quickly measure the radius of the circular arc.
Description
Technical Field
The utility model relates to the technical field of measuring tools, in particular to a measuring device for measuring the radius of an arc.
Background
In the production and manufacturing industry, a plurality of shaft workpieces are involved, and the radius sizes of the shaft workpieces need to be detected. If the workpiece to be measured is a complete circle, the diameter can be measured by a caliper or a micrometer, and then the radius value can be calculated. When the workpiece to be measured is not a full circle, does not pass through two measuring points in the diameter direction for measurement, or is a sector arc, the conventional measuring tool cannot measure the radius of the workpiece. For such workpieces which are not round, an imager or a three-coordinate system is usually used for detection according to the actual size, but the imager has certain requirements on the size of the detected workpiece, and in addition, the two devices are expensive and need certain training operation to measure. For such workpieces that are not round, there is no convenient and effective tool for measuring the radius, and therefore, it is necessary to design a measuring device capable of measuring the radius of the circular arc.
SUMMERY OF THE UTILITY MODEL
To overcome the defects in the prior art, embodiments of the present invention provide a measuring device capable of measuring the radius of a workpiece that is not a full circle, such as a circular arc.
The measuring device for measuring the radius of the circular arc comprises:
the radius gauge comprises a radius gauge base, wherein the radius gauge base is provided with an assembly table, two support legs extend downwards and outwards from two sides of the assembly table respectively, an included angle is formed between the two support legs, and the assembly table is provided with a through hole in the vertical direction;
the digital display meter comprises a dial plate, a fixed rod fixedly connected with the dial plate and a measuring rod sleeved in the fixed rod and elastically connected with the dial plate, the measuring rod can stretch relative to the fixed rod, the fixed rod penetrates through the through hole of the radius gauge base to enable the digital display meter to be fixedly installed on the radius gauge base, and the axis of the measuring rod is superposed with the angular bisector of an included angle formed by the two supporting legs;
the measuring device has an initial state, and when the measuring device is in the initial state, the measuring rod is in an initial position;
the measuring device is also provided with a working state, when the measuring device is in the working state, the two support legs of the radius gauge base are respectively contacted with the arc surface of the product to be detected, the measuring rod is abutted against the product to be detected, the position of the measuring rod is different from the initial position of the measuring rod at the moment, and the dial plate correspondingly displays the radius value of the product to be detected.
Further, the included angle formed by the two support legs is an obtuse angle.
Further, the included angle formed by the two support legs is 120 degrees.
Further, the assembling table of the radius gauge base is further provided with a fixing hole, the fixing hole penetrates through the assembling table in the direction perpendicular to the vertical direction, an opening is formed in the fixing rod, and the digital display meter is fixedly connected to the radius gauge base through a bolt penetrating through the opening of the fixing rod and the fixing hole of the assembling table.
Furthermore, at least one lightening hole is formed in each of the two support legs.
Further, the dial plate of the digital display meter is a digital display dial indicator or a dial indicator.
Further, the width of the two legs is smaller as the distance from the mounting table is larger.
Furthermore, a fixing rod is further arranged above the dial plate of the digital display meter.
The utility model has the following beneficial effects:
therefore, the measuring device can simply, quickly and effectively measure the radius of the arc which is not a full circle, directly and clearly read out the radius of the arc of the article to be detected, solve the technical problem that the actual measurement of the arc section is very complicated and difficult, and provide great convenience for technical personnel.
In order to make the aforementioned and other objects, features and advantages of the utility model comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front view of a measuring device in an embodiment of the utility model;
FIG. 2 is a top view of a radius gauge base of a measuring device in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a measurement device in an embodiment of the present invention;
FIG. 4 is a front view of another large format measuring device in an embodiment of the present invention;
FIG. 5 is a schematic diagram of the calibration of the initial value of a standard 5mm round bar for a measuring device according to an embodiment of the present invention;
fig. 6 is a schematic view of the operating state of the measuring apparatus in the embodiment of the present invention.
Reference numerals of the above figures: measuring device-100; a radius gauge base-1; an assembly table-11; -a leg-12; a through-hole-111; a fixing hole-112; lightening holes-121; a digital display meter-2; a dial-21; a fixed rod-22; a measuring rod-23; sample to be tested-3.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature.
The present invention will be described in detail below with reference to the accompanying drawings and examples.
As shown in fig. 1, a measuring apparatus 100 for measuring a radius of a circular arc includes:
The digital display table 2 comprises a dial 21, a fixing rod 22 fixedly connected with the dial 21 and a measuring rod 23 sleeved in the fixing rod 22 and elastically connected with the dial 21, the measuring rod 23 can stretch relative to the fixing rod 22, the fixing rod 22 penetrates through the through hole 111 of the radius gauge base 1 to enable the digital display table 2 to be fixedly installed on the radius gauge base 1, and the axis of the measuring rod 23 coincides with the angle bisector of an included angle formed by the two supporting legs 12.
The measuring device 100 has an initial state in which the measuring rod 23 is in an initial position when the measuring device 100 is in the initial state.
The measuring device 100 further has a working state, when the measuring device 100 is in the working state, the two support legs 12 of the radius gauge base 1 are respectively in contact with the arc surface of the product 3 to be detected, the measuring rod 23 is abutted to the product 3 to be detected, at this time, the position of the measuring rod 23 is different from the initial position of the measuring rod 23, and the dial 21 correspondingly displays the radius value of the product 3 to be detected.
As shown in fig. 3, the principle of the measuring device 100 is as follows:
when the measuring device 100 measures the object 3 to be detected, the two legs 12 contact the arc surface of the object 3 to be detected respectively, so that the two legs 12 are tangent to the arc respectively, and the intersection point A, B of the two legs 12 and the arc segment is determined as the tangent point. And restoring a whole circle where the arc section is located according to the arc section of the product 3 to be detected, and assuming that the center of the whole circle is O, so that the distance from the center of the circle O to the tangent point A, B is the radius r of the arc section.
The two legs 12 of the measuring device 100 form an angle a of a certain degree, and the vertex of the angle is denoted as D. The angular bisector L of the included angle alpha must pass through the center O of the whole circle, the intersection point of the angular bisector L of the included angle alpha and the whole circle is recorded as C, and the distance between the intersection point C and the vertex D of the included angle alpha is recorded as L.
Because the landing leg 12 is tangent with the whole circle, so the Δ AOD or Δ BOD is a right-angle triangle, and the ═ OAD or ≥ OBD is a right angle, so that it can be known that:
∴
∴
∴
note the book
Then, r ═ l × K;
where K is a coefficient of the measuring device 100, and can be determined by an included angle α between two legs 12 of the measuring device 100. The coefficient K may be engraved on the measuring device 100 or displayed on the dial 21 of the measuring device 100.
And because the measuring rod 23 of the measuring device 100 coincides with the bisector L of the included angle α, and the bottom end of the measuring rod 23 is abutted to the product 3 to be detected, the movement distance of the measuring rod 23 can reflect the distance L between the intersection point C and the vertex D of the included angle α, and then the measuring device 100 can obtain the radius r of the arc of the product 3 to be detected according to the movement distance of the measuring rod 23.
Therefore, the measuring device 100 can simply, quickly and effectively measure the arc radius which is not a full circle, directly and clearly read the arc radius of the to-be-detected object, solve the technical problem that the actual measurement of the arc segment is very complicated and difficult, and provide great convenience for technical personnel.
In order to provide wider applicability of the measuring device 100 and enable detection of the object 3 to be detected with a larger radius, in this embodiment, the included angle α formed by the two support legs 12 is an obtuse angle.
In a preferred embodiment, the angle α formed by the two legs 12 is 120 °.
In order to fix the digital display meter 2 to the radius gauge base 1, the mounting table 11 of the radius gauge base 1 is further provided with a fixing hole 112, as shown in fig. 2. The fixing hole 112 penetrates through the assembling table 11 in the direction perpendicular to the vertical direction, an opening is formed in the fixing rod 22, and the digital display table 2 is fixedly connected to the radius gauge base 1 through a bolt penetrating through the opening of the fixing rod 22 and the fixing hole 112 of the assembling table 11.
In this embodiment, the dial 21 of the digital display meter 2 is a digital display dial indicator or a dial indicator. The digital display type can facilitate the reading of a user, and the dial indicator or the dial indicator can meet the measurement precision requirement.
In order to facilitate taking, a fixing rod 22 is further arranged above the dial plate 21 of the digital display table 2.
In order to save material and reduce the weight of the measuring device 100, the width of the two legs 12 decreases further away from the mounting platform 11.
As shown in fig. 4, is a large format measurement device 100. In order to further reduce the weight of the measuring device 100, at least one lightening hole 121 is formed on two of the supporting legs 12. A plurality of lightening holes 121 are sequentially provided in the extending direction of the leg 12, and since the width of the leg 12 is gradually reduced, the hole diameter of each lightening hole 121 is also gradually reduced.
The initial calibration process of the measuring device will be explained below:
as shown in fig. 5, the measuring apparatus 100 is of a small size, and initial value calibration is performed using a standard round bar having a radius of 5 mm. Taking the small gauge measuring device 100 as an example, a large gauge measuring device can be verified using a standard round bar with a larger radius.
The coefficient K of the measuring device 100 is calculated according to the included angle α being 120 °, and l, which is an initial value of the measuring device 100, can be calculated according to the formula r ═ K according to the known radius r being 5mm, where the position of the measuring rod 23 of the measuring device 100 is an initial position.
The calibration was then carried out using a standard round bar with a radius of 10 mm. The measuring rod 23 moves relative to the initial position, l at the moment is obtained according to the displacement increment of the measuring rod 23, the radius r is obtained through calculation according to the formula r ═ l × K, and whether the radius r obtained through calculation is equal to 10 or not is verified.
And then, calibrating by using standard round rods with other radius sizes, and comparing and calculating whether the obtained radius r is equal to the standard radius value.
And correcting the coefficient K of the measuring device according to the comparison result so as to detect again until the precision deviation meets the requirement. The precision is generally controlled to be 0.02 mm.
Fig. 6 is a schematic view showing the small-sized measuring device 100 in an operating state. Taking the small-sized measuring device 100 as an example, the large-sized measuring device is the same as it. In this operating state, the measuring rod 23 is in telescopic abutment with the object 3 to be detected, and the position of the measuring rod 23 is changed by Δ l from the initial position, and then the radius r of the object 3 to be detected is obtained according to the formula r ═ l × K.
The principle and the implementation mode of the utility model are explained by applying specific embodiments in the utility model, and the description of the embodiments is only used for helping to understand the method and the core idea of the utility model; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A measuring device for measuring a radius of a circular arc, comprising:
the radius gauge comprises a radius gauge base, wherein the radius gauge base is provided with an assembly table, two support legs extend downwards and outwards from two sides of the assembly table respectively, an included angle is formed between the two support legs, and the assembly table is provided with a through hole in the vertical direction;
the digital display meter comprises a dial plate, a fixed rod fixedly connected with the dial plate and a measuring rod sleeved in the fixed rod and elastically connected with the dial plate, the measuring rod can stretch relative to the fixed rod, the fixed rod penetrates through the through hole of the radius gauge base to enable the digital display meter to be fixedly installed on the radius gauge base, and the axis of the measuring rod is superposed with the angular bisector of an included angle formed by the two supporting legs;
the measuring device has an initial state, and when the measuring device is in the initial state, the measuring rod is in an initial position;
the measuring device is also provided with a working state, when the measuring device is in the working state, the two support legs of the radius gauge base are respectively contacted with the arc surface of the product to be detected, the measuring rod is abutted against the product to be detected, the position of the measuring rod is different from the initial position of the measuring rod at the moment, and the dial plate correspondingly displays the radius value of the product to be detected.
2. The apparatus according to claim 1, wherein the two legs form an obtuse angle.
3. A measuring device for measuring the radius of a circular arc according to claim 2, wherein the angle formed by the two legs is 120 °.
4. The apparatus as claimed in claim 1, wherein the mounting table of the radius gauge base is further provided with a fixing hole, the fixing hole penetrates through the mounting table in a direction perpendicular to a vertical direction, the fixing rod is provided with an opening, and the digital display gauge is fixedly connected to the radius gauge base by a bolt passing through the opening of the fixing rod and the fixing hole of the mounting table.
5. The device as claimed in claim 1, wherein at least one lightening hole is formed on each of the two legs.
6. The measuring device for measuring the radius of the circular arc according to claim 1, wherein the dial plate of the digital display meter is a digital display type dial indicator or a dial indicator.
7. The apparatus of claim 1, wherein the width of the two legs decreases away from the mounting platform.
8. The device for measuring the radius of an arc of a circle as claimed in claim 1, wherein a fixing rod is further disposed above the dial plate of the digital display table.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121372195.4U CN215338105U (en) | 2021-06-21 | 2021-06-21 | Measuring device for measuring arc radius |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121372195.4U CN215338105U (en) | 2021-06-21 | 2021-06-21 | Measuring device for measuring arc radius |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114646252A (en) * | 2022-03-24 | 2022-06-21 | 宝鸡法士特齿轮有限责任公司 | Device and method for digitally detecting excircle fillet |
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2021
- 2021-06-21 CN CN202121372195.4U patent/CN215338105U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114646252A (en) * | 2022-03-24 | 2022-06-21 | 宝鸡法士特齿轮有限责任公司 | Device and method for digitally detecting excircle fillet |
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