Radian measuring ruler

Abstract

The utility model discloses a radian measuring ruler, which comprises an arc-shaped ruler body, a chord height ruler, a first chord length ruler and a second chord length ruler, the chord height ruler is adjustably arranged at the central position of the arc-shaped ruler body along the radial direction of the arc-shaped ruler body, and the first chord length ruler is adjustably arranged at one end of the arc-shaped ruler body along the direction vertical to the chord height ruler. The second chord length ruler is adjustably arranged at the other end of the arc-shaped ruler body in the direction perpendicular to the chord height ruler, and the first chord length ruler and the second chord length ruler are symmetrically arranged relative to the chord height ruler. The chord height and the chord length are adjusted through the chord height scale, the first chord length scale and the second chord length scale which are adjustably arranged on the arc-shaped scale body, the roundness deviation of the pipe is measured through the chord height and the chord length, the device is suitable for roundness deviation measurement of pipes of different sizes, the application range is wide, and the measurement precision is high. Meanwhile, the roundness deviation value of the pipe can be directly read through the chord height scale, convenience and rapidness are achieved, errors are small, and measurement precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of physical measuring tools, in particular to a measuring arc ruler. Background Art

[0002] In the process of pipe processing and installation, roundness is a very important parameter. It is defined as the difference between the maximum circle and the minimum circle of the pipe wall in the pipe section, usually expressed as the deviation of the diameter. In order to ensure the quality of the pipe, roundness detection is essential.

[0003] In the existing pipe roundness detection methods, tools such as squares and vernier calipers are usually used to measure relevant data. These measuring tools have more or less some disadvantages. For example, due to the size of the measuring tools, the detection range is limited and it is not suitable for large-sized pipe roundness detection; the pipe roundness deviation cannot be directly measured, and manual visual judgment of the maximum outer diameter and the minimum outer diameter position is required, and then the pipe diameter parameters at the corresponding position are measured, and the roundness deviation value is calculated by the diameter, which has a large error. Utility Model Content

[0004] The utility model aims to provide a measuring arc ruler which is convenient for measurement and has a wide application range.

[0005] In order to achieve the above-mentioned purpose, the technical solution proposed by the utility model is:

[0006] A measuring arc ruler comprises: an arc ruler body, a chord height scale which is adjustable along the radial direction of the arc ruler body and arranged at the center position of the arc ruler body, a first chord length scale which is adjustable along a direction perpendicular to the chord height scale and arranged at one end of the arc ruler body, and a second chord length scale which is adjustable along a direction perpendicular to the chord height scale and arranged at the other end of the arc ruler body, wherein the first chord length scale and the second chord length scale are symmetrically arranged with respect to the chord height scale.

[0007] Preferably, a first guide slider is provided at the center and both ends of the arc-shaped ruler body, the first guide slider is provided with a first guide hole and a first threaded hole vertically connected to the first guide hole, and a first fastening bolt is threadedly connected in the first threaded hole. The chord height scale, the first chord length scale and the second chord length scale are respectively inserted into the first guide holes of the corresponding first guide slider, and are restricted from sliding by the first fastening bolt.

[0008] Preferably, the chord height scale, the first chord length scale and the second chord length scale are respectively provided with a first limit block at one end located outside the arc-shaped scale body.

[0009] Preferably, a plurality of hand holes are provided on the arc-shaped ruler.

[0010] Preferably, the chord height scale, the first chord length scale and the second chord length scale are all configured as cylindrical, and one end located inside the arc-shaped scale body is configured as a sharp end.

[0011] Preferably, the chord height scale, the first chord length scale and the second chord length scale are all provided with adjustment scales which increase in sequence from one end located on the inner side of the arc-shaped scale body to one end located on the outer side of the arc-shaped scale body, and the chord height scale is also provided with a reference scale corresponding to the fixed diameter.

[0012] Preferably, a positioning ruler body is vertically connected to the center of the arc ruler body, one end of the positioning ruler body is provided with a first positioning ruler adjustable along the direction parallel to the chord height ruler, and the other end of the positioning ruler body is provided with a second positioning ruler adjustable along the direction parallel to the chord height ruler.

[0013] Preferably, a second guide slider is provided at each end of the positioning ruler body, the second guide slider is provided with a second guide hole and a second threaded hole vertically connected to the second guide hole, and a second fastening bolt is threadedly connected in the second threaded hole. The first positioning ruler and the second positioning ruler are respectively inserted into the second guide holes of the corresponding second guide sliders, and are restricted from sliding by the second fastening bolts.

[0014] Preferably, the first positioning ruler and the second positioning ruler are both configured in a cylindrical shape, and one end located on the inner side of the positioning ruler body is configured as a sharp end, and one end located on the outer side of the positioning ruler body is configured with a second limit block.

[0015] Preferably, both the first positioning scale and the second positioning scale are provided with adjustment scales which increase in sequence from one end located on the inner side of the positioning scale body to one end located on the outer side of the positioning scale body, and reference scales corresponding to the fixed diameter.

[0016] By adopting the above technical scheme, the utility model has the following beneficial effects: the utility model adjusts the chord height and the chord length by means of the chord height scale, the first chord length scale and the second chord length scale which are adjustably arranged on the arc-shaped ruler, and measures the roundness deviation of the pipe by means of the chord height and the chord length. The utility model is suitable for measuring the roundness deviation of pipes of different sizes and has a wide range of applications. At the same time, the roundness deviation value of the pipe can be directly read out by means of the chord height scale, which is convenient and fast, has a small error and a high measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the arc measuring ruler of the first embodiment.

[0018] Figure 2 The diagram is a measurement diagram of the arc measuring ruler of the first embodiment.

[0019] Figure 3 It is a schematic diagram of the assembly of the first guide slider, the first fastening bolt and the chord height scale of the first embodiment.

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the arc measuring ruler of the second embodiment.

[0021] Figure 5 This is a measurement schematic diagram of the arc measuring ruler of the second embodiment.

[0022] Figure 6 This is a schematic diagram of the assembly of the second guide slider, the second fastening bolt and the first positioning scale of the second embodiment.

[0023] Wherein: 1. arc-shaped ruler body; 11. first guide slider; 111. first guide hole; 112. first threaded hole; 12. first fastening bolt; 13. hand position hole; 2. chord height scale; 21. first limit block; 3. first chord length scale; 4. second chord length scale; 5. positioning ruler body; 51. second guide slider; 511. second guide hole; 512. second threaded hole; 52. second fastening bolt; 6. first positioning scale; 61. second limit block; 7. second positioning scale; 8. measured pipe. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Embodiment 1

[0026] Reference Figure 1 to Figure 3 , Figure 1 to Figure 3 The arc measuring ruler of this embodiment is shown, which includes an arc ruler body 1 and a chord height scale 2, a first chord length scale 3 and a second chord length scale 4 which are adjustable and arranged on the arc ruler body 1. The chord height scale 2 is arranged at the center of the arc ruler body 1 and can be moved radially along the arc ruler body 1 to adjust the chord height. The first chord length scale 3 and the second chord length scale 4 are symmetrically arranged on both sides of the chord height scale 2 and are perpendicular to the chord height scale 2. The first chord height scale 2 and the second chord height scale 2 can be moved in a direction perpendicular to the chord height scale 2 to change the distance between them to adjust the chord length. The chord height scale 2, the first chord length scale 3 and the second chord length scale 4 are all equipped with adjustment scales that increase in sequence from one end located on the inner side of the arc ruler body 1 to the other end located on the outer side of the arc ruler body 1, and the accuracy is preferably 1mm. The chord height scale 2 is also equipped with a reference scale corresponding to a fixed diameter to quickly adjust pipes of common sizes, which is conducive to improving measurement efficiency.

[0027] In a feasible option of this embodiment, the chord height scale 2, the first chord length scale 3 and the second chord length scale 4 are all adjustably mounted on the arc-shaped ruler body 1 through the first guide slider 11 and the first fastening bolt 12. Specifically, a first guide slider 11 is fixed at the center position and both ends of the arc-shaped ruler body 1, and the first guide slider 11 is provided with a first guide hole 111 and a first threaded hole 112 vertically connected to the first guide hole 111, and the first threaded hole 112 is internally threadedly connected with the first fastening bolt 12. Figure 3Taking the chord height scale 2 as an example, the chord height scale 2 is inserted into the first guide hole 111, and the first fastening bolt 12 is tightened to press the chord height scale 2 against the side wall of the first guide hole 111, so that the chord height scale 2 can be restricted from sliding axially along the first guide hole 111. The chord height scale 2 can be moved axially to measure the chord height by loosening the first fastening bolt 12. The adjustment of the first chord length scale 3 and the second chord length scale 4 is the same as that of the chord height scale 2, and will not be repeated.

[0028] In order to facilitate adjustment and measurement, in a feasible option of this embodiment, the chord height scale 2, the first chord length scale 3, and the second chord length scale 4 are all configured as cylindrical, and the ends of the three located on the inner side of the arc-shaped ruler 1 are configured as sharp ends, and the ends located on the outer side of the arc-shaped ruler 1 are configured with a first stop block 21. The sharp ends make the contact between the chord height scale 2, the first chord length scale 3, and the second chord length scale 4 and the measured pipe 8 point contact, which can ensure the contact accuracy, reduce the error, and thus improve the measurement accuracy. The first stop block 21 can prevent the chord height scale 2, the first chord length scale 3, and the second chord length scale 4 from slipping out of the first guide hole 111.

[0029] In a feasible option of this embodiment, a plurality of arc-shaped hand holes 13 extending along the circumferential direction are provided on the arc-shaped ruler body 1. The hand holes 13 are convenient for hand-held measurement and can reduce weight, material and cost.

[0030] The working principle of the arc measuring ruler of this embodiment is as follows:

[0031] According to the diameter of the measured pipe 8, the first chord length scale 3 and the second chord length scale 4 are symmetrically adjusted and locked, so that the spacing between the first chord length scale 3 and the second chord length scale 4 is smaller than the diameter of the measured pipe 8, and the measuring chord length is determined. Then the chord height scale 2 is adjusted and locked to determine the measuring chord height. Subsequently, the measuring arc ruler can be clamped on the measured pipe 8. The sharp ends of the first chord length scale 3, the second chord length scale 4 and the chord height scale 2 all contact with the outer wall of the measured pipe 8, indicating that there is no roundness deviation at this position. Otherwise, there is a roundness deviation, and the deviation value can be read by adjusting the chord height scale 2 until its sharp end contacts the outer wall of the measured pipe 8.

[0032] Embodiment 2

[0033] This embodiment adds a positioning structure on the basis of the first embodiment to ensure that the chord height scale 2, the first chord length scale 3 and the second chord length scale 4 are located in the same cross section during measurement, so as to ensure the accuracy of the measurement result. Figures 4 to 6Specifically, in this embodiment, the positioning ruler body 5 is vertically connected to the center position of the arc ruler body 1, and the two are arranged in a cross orientation. The two ends of the arc ruler body 1 are respectively provided with a first positioning ruler 6 and a second positioning ruler 7 symmetrical about the chord height scale 2, and the first positioning ruler 6 and the second positioning ruler 7 can be moved in a direction parallel to the chord height scale 2. The ends of the first positioning ruler 6 and the second positioning ruler 7 located on the inner side of the positioning ruler body 5 are adjusted to be aligned with the sharp end of the chord height scale 2, so that during measurement, the first positioning ruler 6 and the second positioning ruler 7 are used for positioning to ensure that the chord height scale 2, the first chord length scale 3 and the second chord length scale 4 are perpendicular to the axis of the measured pipe 8.

[0034] In a feasible option of this embodiment, the first positioning scale 6 and the second positioning scale 7 are both adjustably mounted on the positioning scale body 5 through the second guide slider 51 and the second fastening bolt 52. Specifically, a second guide slider 51 is fixed at each end of the positioning scale body 5, and the second guide slider 51 is provided with a second guide hole 511 and a second threaded hole 512 vertically connected to the second guide hole 511, and the second threaded hole 512 is threadedly connected with the second fastening bolt 52. Figure 6 Taking the first positioning scale 6 as an example, insert the first positioning scale 6 into the second guide hole 511, tighten the second fastening bolt 52 to press the first positioning scale 6 against the side wall of the second guide hole 511, and limit the first positioning scale 6 from sliding axially along the second guide hole 511. Loosen the second fastening bolt 52 to axially move the first positioning scale 6 for adjustment. The adjustment of the second positioning scale 7 is the same as that of the first positioning scale 6, and will not be repeated.

[0035] In order to facilitate adjustment, in a feasible option of this embodiment, the first positioning scale 6 and the second positioning scale 7 are both configured as cylindrical, and the end located on the inner side of the positioning scale body 5 is configured as a sharp end to improve the contact accuracy and reduce the error. The end located on the outer side of the positioning scale body 5 is configured with a second limit block 61 to prevent the first positioning scale 6 / the second positioning scale 7 from sliding off the second guide hole 511 when it is not locked. The first positioning scale 6 and the second positioning scale 7 are both configured with adjustment scales that increase in sequence from the end located on the inner side of the positioning scale body 5 to the end located on the outer side of the positioning scale body 5, and a reference scale corresponding to the fixed diameter, so as to facilitate adjustment consistent with the chord height scale 2.

[0036] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes in form and details of the present invention are within the scope of protection of the present invention without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A measuring arc ruler, characterized in that: include: Curved ruler (1); A chord height scale (2) is adjustable along the radial direction of the arc-shaped scale body (1) and is arranged at the center of the arc-shaped scale body (1); A first chord length scale (3) is adjustable in a direction perpendicular to the chord height scale (2) and is disposed at one end of the arc-shaped scale body (1); A second chord length scale (4) is adjustable in a direction perpendicular to the chord height scale (2) and is disposed at the other end of the arc-shaped scale body (1); The first chord length scale (3) and the second chord length scale (4) are symmetrically arranged with respect to the chord height scale (2).

2. The arc measuring ruler according to claim 1, characterized in that: The arc-shaped ruler (1) is provided with a first guide slider (11) at the center and at both ends thereof; The first guide sliding block (11) is provided with a first guide hole (111) and a first threaded hole (112) vertically connected to the first guide hole (111); the first threaded hole (112) is internally threadedly connected to a first fastening bolt (12); The chord height scale (2), the first chord length scale (3) and the second chord length scale (4) are respectively inserted into the first guide holes (111) of the corresponding first guide slide blocks (11), and are restricted from sliding by the first fastening bolts (12).

3. The arc measuring ruler according to claim 1, characterized in that: The chord height scale (2), the first chord length scale (3) and the second chord length scale (4) are respectively provided with a first limit block (21) at one end located outside the arc-shaped scale body (1).

4. The arc measuring ruler according to claim 1, characterized in that: The arc-shaped ruler body (1) is provided with a plurality of hand holes (13).

5. The arc measuring ruler according to claim 1, characterized in that: The chord height scale (2), the first chord length scale (3) and the second chord length scale (4) are all configured in a cylindrical shape, and one end located inside the arc-shaped scale body (1) is configured as a sharp end.

6. The arc measuring ruler according to claim 1, characterized in that: The chord height scale (2), the first chord length scale (3) and the second chord length scale (4) are all provided with adjustment scales which increase in sequence from one end located on the inner side of the arc-shaped scale body (1) to one end located on the outer side of the arc-shaped scale body (1), and the chord height scale (2) is provided with a reference scale corresponding to a fixed diameter.

7. The arc measuring ruler according to any one of claims 1 to 6, characterized in that: Also includes: A positioning ruler body (5) vertically connected to the center position of the arc-shaped ruler body (1); A first positioning scale (6) is adjustable and arranged at one end of the positioning scale body (5) in a direction parallel to the chord height scale (2); The second positioning scale (7) is adjustable and arranged at the other end of the positioning scale body (5) in a direction parallel to the chord height scale (2).

8. The arc measuring ruler according to claim 7, characterized in that: The two ends of the positioning ruler (5) are respectively provided with a second guide slide block (51); The second guide sliding block (51) is provided with a second guide hole (511) and a second threaded hole (512) vertically connected to the second guide hole (511); the second threaded hole (512) is internally threadedly connected to a second fastening bolt (52); The first positioning scale (6) and the second positioning scale (7) are respectively inserted into the second guide holes (511) of the corresponding second guide slide blocks (51), and are restricted from sliding by the second fastening bolts (52).

9. The arc measuring ruler according to claim 7, characterized in that: The first positioning ruler (6) and the second positioning ruler (7) are both configured in a cylindrical shape, and one end located inside the positioning ruler body (5) is configured as a sharp end, and the other end located outside the positioning ruler body (5) is configured with a second limit block (61).

10. The arc measuring ruler according to claim 7, characterized in that: The first positioning scale (6) and the second positioning scale (7) are both provided with adjustment scales which increase in sequence from one end located on the inner side of the positioning scale body (5) to one end located on the outer side of the positioning scale body (5), and reference scales corresponding to the fixed diameter.

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