CN112648905A - Three-point caliper and measuring method thereof - Google Patents
Three-point caliper and measuring method thereof Download PDFInfo
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- CN112648905A CN112648905A CN202011446401.1A CN202011446401A CN112648905A CN 112648905 A CN112648905 A CN 112648905A CN 202011446401 A CN202011446401 A CN 202011446401A CN 112648905 A CN112648905 A CN 112648905A
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- measuring claw
- fixed measuring
- claw
- fixed
- movable
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/08—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters
- G01B5/12—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters internal diameters
Abstract
The invention provides a three-point caliper and a measuring method thereof; the three-point caliper comprises a main caliper (1), wherein a sliding groove (11) is formed in the main caliper (1); the three-point caliper further comprises a movable caliper body (8) which is slidably arranged in the sliding groove (11); a first extension part (12) is formed on one side of the main scale (1), and a second extension part (13) is formed on the other side of the main scale; a first fixed measuring claw (2) is formed on the first extending part (12) in a protruding mode, and a second fixed measuring claw (3) is formed on the second extending part (13) in a protruding mode; the first fixed measuring claw (2) and the second fixed measuring claw (3) are symmetrically arranged by taking the symmetrical plane of the sliding groove (11) as a symmetrical plane; a movable measuring claw (4) is formed on the movable ruler body (8) in a protruding way. The three-point caliper and the measuring method thereof have novel design and strong practicability.
Description
Technical Field
The invention relates to the field of measuring equipment, in particular to a three-point caliper and a measuring method thereof.
Background
The caliper is a measuring tool used for measuring length, inner diameter and outer diameter, and has the functions of measurement and inspection. When the calipers are used for measuring the aperture, the inner diameter measuring claw easily slides on the surface of a part, so that the cutting edge of the inner diameter measuring claw is not clamped on the diameter of the hole, and the measured numerical value is small.
Disclosure of Invention
The invention aims to provide a three-point caliper and a measuring method thereof aiming at the technical problems.
The technical scheme for solving the technical problem is as follows:
the invention provides a three-point caliper, which comprises a main caliper, wherein a sliding groove is formed in the main caliper; the three-point caliper further comprises a movable caliper body which is slidably arranged in the sliding groove;
a first extension part is formed on one side of the main scale, and a second extension part is formed on the other side of the main scale; a first fixed measuring claw is formed on the first extending part in a protruding mode, and a second fixed measuring claw is formed on the second extending part in a protruding mode; the first fixed measuring claw and the second fixed measuring claw are symmetrically arranged by taking the symmetrical plane of the sliding groove as a symmetrical plane; a movable measuring claw is convexly formed on the movable ruler body;
the first fixed measuring claw, the second fixed measuring claw and the movable measuring claw are all circular in section and equal in diameter.
In the aforementioned three-point caliper of the present invention, the main scale is provided with measurement scales extending along the extending direction of the sliding groove.
In the above three-point caliper of the present invention, the three-point caliper further includes a module part fixedly connected to the movable measuring jaw and configured to read measurement data according to different measurement modes; the liquid crystal display screen is arranged on the module part and used for displaying the measurement data.
In the aforementioned three-point caliper of the present invention, the three-point caliper further includes a fastening screw threadedly mounted on the module portion for detachably abutting against the main scale by the knob.
In the aforementioned three-point caliper of the present invention, the three-point caliper further includes a roller mounted on the module portion and rollably disposed on the main scale.
In the aforementioned three-point caliper of the present invention, the three-point caliper further includes a mode switching button installed on the module part for switching the measurement mode; the limiting block is arranged on the main scale, is positioned at one end of the sliding groove and is used for limiting the module part in the area where the sliding groove is positioned.
The invention also provides a measuring method based on the three-point caliper, which comprises the following steps:
step S0, acquiring a first distance b from the axis of the first fixed measuring jaw to the symmetrical plane of the sliding groove in advance; the diameter d of the first fixed measuring claw is obtained in advance;
step S1, the first fixed measuring claw, the second fixed measuring claw and the movable measuring claw extend into the hole to be measured and are abutted against the hole to be measured through the first fixed measuring claw, the second fixed measuring claw and the movable measuring claw;
step S2, measuring a second distance a from the axis of the movable measuring jaw to the connecting line of the first fixed measuring jaw and the second fixed measuring jaw;
calculating the aperture D of the hole to be measured according to the first distance b, the diameter D and the second distance a, wherein the method comprises the following steps:
D＝d+a+b2/a；
step S3, the module displays the calculated aperture D.
The invention also provides a measuring method based on the three-point caliper, which comprises the following steps:
step S0, the diameter d of the first fixed measuring jaw is obtained in advance;
step S1, the first fixed measuring claw, the second fixed measuring claw and the movable measuring claw extend into the square groove and are pressed against the square groove through the first fixed measuring claw, the second fixed measuring claw and the movable measuring claw;
step S2, measuring a second distance a from the axis of the movable measuring jaw to the connecting line of the first fixed measuring jaw and the second fixed measuring jaw;
calculating the length L of the square groove according to the diameter d and the second distance a, and comprising the following steps:
L＝d+a；
in step S3, the calculated length L is displayed by the module unit.
The invention also provides a measuring method based on the three-point caliper, which comprises the following steps:
step S0, the diameter d of the first fixed measuring jaw is obtained in advance;
step S1, clamping the square object by the first fixed measuring claw, the second fixed measuring claw and the movable measuring claw;
step S2, measuring a second distance a from the axis of the movable measuring jaw to the connecting line of the first fixed measuring jaw and the second fixed measuring jaw;
calculating the length L2 of the square from the diameter d and the second distance a, there are:
L2＝a-d；
in step S3, the calculated length L2 is displayed by the module unit.
The three-point caliper and the measuring method thereof locate the hole to be measured by extending the first fixed measuring claw 2, the second fixed measuring claw 3 and the movable measuring claw 4 into and abutting against the hole to be measured according to the principle of three-point circle. The scheme can avoid the inner diameter measuring claw from easily sliding on the surface of the part, thereby reducing errors. The three-point caliper and the measuring method thereof have novel design and strong practicability.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 shows a schematic structural view of a three-point caliper according to a preferred embodiment of the present invention;
fig. 2 shows a schematic view of a first measuring state of the three-point caliper shown in fig. 1;
FIG. 3 shows a schematic view of a second measurement state of the three-point caliper shown in FIG. 1;
fig. 4 shows a third measuring state diagram of the three-point caliper shown in fig. 1.
Detailed Description
In order to make the technical purpose, technical solutions and technical effects of the present invention more clear and facilitate those skilled in the art to understand and implement the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, fig. 1 is a schematic structural view showing a three-point caliper according to a preferred embodiment of the present invention. The three-point caliper comprises a main scale 1, wherein a sliding groove 11 is formed in the main scale 1; the three-point caliper further comprises a movable blade 8 which is slidably arranged in the sliding groove 11;
a first extension part 12 is formed on one side of the main ruler 1, and a second extension part 13 is formed on the other side; a first fixed measuring claw 2 is formed on the first extending part 12 in a protruding mode, and a second fixed measuring claw 3 is formed on the second extending part 13 in a protruding mode; the first fixed measuring claw 2 and the second fixed measuring claw 3 are symmetrically arranged by taking the symmetrical plane of the sliding groove 11 as a symmetrical plane; a movable measuring claw 4 is convexly formed on the movable ruler body 8;
the cross sections of the first fixed measuring claw 2, the second fixed measuring claw 3 and the movable measuring claw 4 are all circular, and the diameters are equal.
The scheme is a basic scheme, and the hole to be measured is positioned by extending the first fixed measuring claw 2, the second fixed measuring claw 3 and the movable measuring claw 4 into and abutting against the hole to be measured according to the principle of three-point circle. The scheme can avoid the inner diameter measuring claw from easily sliding on the surface of the part, thereby reducing errors.
Further, the main scale 1 is provided with a measurement scale 14 extending along the extending direction of the slide groove 11.
Further, in the present embodiment, the three-point caliper further includes a module portion 7 fixedly connected to the movable measuring jaw 4 for reading the measurement data according to different measurement modes.
In order to avoid relative sliding between the module part 7 and the object to be measured during measurement, the three-point caliper further comprises a fastening screw 6 which is threadedly mounted on the module part 7 and is used for detachably abutting against the main scale 1 through a knob. It can be understood that when the fastening screw 6 abuts against the main scale 1, relative sliding between the die set portion 7 and the object to be measured is difficult to occur due to the effect of friction.
Further, the three-point caliper further comprises a liquid crystal display 5 arranged on the module part 7 and used for displaying the measured data. The three-point caliper further comprises a roller 9 mounted on the module portion 7 and rollably disposed on the main scale 1.
In the present embodiment, the measurement mode includes an aperture mode, an inner shape mode, and an outer shape mode. In order to switch between different measurement modes, the three-point caliper further includes a mode switching button 10 mounted on the module portion 7 for switching the measurement mode.
Further, the three-point caliper further includes a restricting piece 15 mounted on the main scale 1 at one end of the slide groove 11 for restricting the module portion 7 in the area of the slide groove 11.
In order to measure the diameter of a hole to be measured, as shown in fig. 2, fig. 2 shows a first measurement state diagram of the three-point caliper shown in fig. 1. The invention also provides a measuring method based on the three-point caliper, which comprises the following steps:
step S0, acquiring a first distance b from the axis of the first fixed measuring jaw 2 to the symmetrical plane of the sliding groove 11 in advance; the diameter d of the first fixed measuring jaw 2 is obtained in advance;
step S1, the first fixed measuring claw 2, the second fixed measuring claw 3 and the movable measuring claw 4 are stretched into the hole to be measured and are abutted against the hole to be measured through the first fixed measuring claw 2, the second fixed measuring claw 3 and the movable measuring claw 4;
step S2, measuring a second distance a from the axis of the movable measuring claw 4 to the connecting line of the first fixed measuring claw 2 and the second fixed measuring claw 3;
calculating the aperture D of the hole to be measured according to the first distance b, the diameter D and the second distance a, wherein the method comprises the following steps:
D＝d+a+b2/a；
in step S3, the module unit 7 displays the calculated aperture D.
This measuring method of measuring the aperture D of the hole to be measured corresponds to the aperture mode.
In order to measure the length of the square groove, as shown in fig. 3, fig. 3 shows a second measurement state diagram of the three-point caliper shown in fig. 1. The invention also provides a measuring method based on the three-point caliper, which comprises the following steps:
step S0, the diameter d of the first fixed measuring jaw 2 is obtained in advance;
step S1, the first fixed measuring claw 2, the second fixed measuring claw 3 and the movable measuring claw 4 are stretched into the square groove and are pressed against the square groove through the first fixed measuring claw 2, the second fixed measuring claw 3 and the movable measuring claw 4;
step S2, measuring a second distance a from the axis of the movable measuring claw 4 to the connecting line of the first fixed measuring claw 2 and the second fixed measuring claw 3;
calculating the length L of the square groove according to the diameter d and the second distance a, and comprising the following steps:
L＝d+a；
in step S3, the module unit 7 displays the calculated length L.
This measuring method for measuring the length L of the square groove corresponds to the inside shape mode.
In order to measure the length of the square, as shown in fig. 4, fig. 4 shows a third measurement state diagram of the three-point caliper shown in fig. 1. The invention also provides a measuring method based on the three-point caliper, which comprises the following steps:
step S0, the diameter d of the first fixed measuring jaw 2 is obtained in advance;
step S1, clamping the square object by the first fixed measuring claw 2, the second fixed measuring claw 3 and the movable measuring claw 4;
step S2, measuring a second distance a from the axis of the movable measuring claw 4 to the connecting line of the first fixed measuring claw 2 and the second fixed measuring claw 3;
calculating the length L2 of the square from the diameter d and the second distance a, there are:
L2＝a-d；
in step S3, the calculated length L2 is displayed by the module unit 7.
In the above-described measuring method, the module unit 7 measures the second distance a from the axis of the movable measuring jaw 4 to the line connecting the first fixed measuring jaw 2 and the second fixed measuring jaw 3, based on the capacitance sensor therein.
This measurement method for measuring the length L2 of the square corresponds to the outline mode.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (9)
1. A three-point caliper is characterized by comprising a main scale (1), wherein a sliding groove (11) is formed in the main scale (1); the three-point caliper further comprises a movable caliper body (8) which is slidably arranged in the sliding groove (11);
a first extension part (12) is formed on one side of the main scale (1), and a second extension part (13) is formed on the other side of the main scale; a first fixed measuring claw (2) is formed on the first extending part (12) in a protruding mode, and a second fixed measuring claw (3) is formed on the second extending part (13) in a protruding mode; the first fixed measuring claw (2) and the second fixed measuring claw (3) are symmetrically arranged by taking the symmetrical plane of the sliding groove (11) as a symmetrical plane; a movable measuring claw (4) is formed on the movable ruler body (8) in a protruding way;
the cross sections of the first fixed measuring claw (2), the second fixed measuring claw (3) and the movable measuring claw (4) are circular, and the diameters of the first fixed measuring claw, the second fixed measuring claw and the movable measuring claw are equal.
2. The three-point caliper according to claim 1, characterized in that the main scale (1) is provided with a measuring scale (14) extending in the direction in which the sliding groove (11) extends.
3. The three-point caliper according to claim 1, characterized in that the three-point caliper further comprises a module part (7) fixedly connected to the movable measuring jaw (4) for reading measurement data according to different measurement modes; the device also comprises a liquid crystal display screen (5) which is arranged on the module part (7) and is used for displaying the measured data.
4. The three-point caliper according to claim 3, characterized in that the three-point caliper further comprises a fastening screw (6) threadedly mounted on the module part (7) for detachably abutting against the main scale (1) by means of a knob.
5. The three-point caliper according to claim 3, characterized in that the three-point caliper further comprises a roller (9) mounted on the module portion (7) and rollably disposed on the main scale (1).
6. The three-point caliper according to claim 3, characterized in that the three-point caliper further comprises a mode switching button (10) mounted on the module portion (7) for switching the measurement mode; the adjustable ruler also comprises a limiting block (15) which is arranged on the main ruler (1), is positioned at one end of the sliding groove (11) and is used for limiting the module part (7) in the area where the sliding groove (11) is positioned.
7. A measuring method based on the three-point caliper according to any one of claims 3 to 6, characterized by comprising the steps of:
step S0, acquiring a first distance b from the axis of the first fixed measuring claw (2) to the symmetrical plane of the sliding groove (11) in advance; the diameter d of the first fixed measuring claw (2) is obtained in advance;
step S1, extending the first fixed measuring claw (2), the second fixed measuring claw (3) and the movable measuring claw (4) into the hole to be measured, and pressing the hole to be measured through the first fixed measuring claw (2), the second fixed measuring claw (3) and the movable measuring claw (4);
step S2, measuring a second distance a from the axis of the movable measuring claw (4) to the connecting line of the first fixed measuring claw (2) and the second fixed measuring claw (3);
calculating the aperture D of the hole to be measured according to the first distance b, the diameter D and the second distance a, wherein the method comprises the following steps:
D＝d+a+b2/a；
in step S3, the module unit (7) displays the calculated aperture D.
8. A measuring method based on the three-point caliper according to any one of claims 3 to 6, characterized by comprising the steps of:
step S0, the diameter d of the first fixed measuring claw (2) is obtained in advance;
step S1, the first fixed measuring claw (2), the second fixed measuring claw (3) and the movable measuring claw (4) extend into the square groove and are pressed against the square groove through the first fixed measuring claw (2), the second fixed measuring claw (3) and the movable measuring claw (4);
step S2, measuring a second distance a from the axis of the movable measuring claw (4) to the connecting line of the first fixed measuring claw (2) and the second fixed measuring claw (3);
calculating the length L of the square groove according to the diameter d and the second distance a, and comprising the following steps:
L＝d+a；
in step S3, the module unit (7) displays the calculated length L.
9. A measuring method based on the three-point caliper according to any one of claims 3 to 6, characterized by comprising the steps of:
step S0, the diameter d of the first fixed measuring claw (2) is obtained in advance;
step S1, clamping the square object by the first fixed measuring claw (2), the second fixed measuring claw (3) and the movable measuring claw (4);
step S2, measuring a second distance a from the axis of the movable measuring claw (4) to the connecting line of the first fixed measuring claw (2) and the second fixed measuring claw (3);
calculating the length L2 of the square from the diameter d and the second distance a, there are:
L2＝a-d；
in step S3, the module unit (7) displays the calculated length L2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011446401.1A CN112648905A (en) | 2020-12-08 | 2020-12-08 | Three-point caliper and measuring method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011446401.1A CN112648905A (en) | 2020-12-08 | 2020-12-08 | Three-point caliper and measuring method thereof |
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| Publication Number | Publication Date |
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| CN112648905A true CN112648905A (en) | 2021-04-13 |
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| CN202011446401.1A Pending CN112648905A (en) | 2020-12-08 | 2020-12-08 | Three-point caliper and measuring method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116294899A (en) * | 2023-05-18 | 2023-06-23 | 山西电机制造有限公司 | Three-point type detection measuring tool and measurement method |
-
2020
- 2020-12-08 CN CN202011446401.1A patent/CN112648905A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116294899A (en) * | 2023-05-18 | 2023-06-23 | 山西电机制造有限公司 | Three-point type detection measuring tool and measurement method |
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