CN211668372U - Spiral vernier micrometer - Google Patents

Abstract

The utility model relates to a spiral vernier micrometer, which comprises a fixed wheel and a rotating wheel; the fixed wheel is provided with fixed scales which comprise integer scales, half-divided scales and rotary scales; the rotating wheel is provided with vernier scales which are divided into ten-grid vernier, twenty-grid vernier and fifty-grid vernier. The utility model discloses simple structure combines slide caliper and micrometer caliper measurement function, can come with the reading of micrometer caliper's estimation reading position accuracy.

Description

Spiral vernier micrometer

Technical Field

The utility model belongs to the technical field of measuring tool, concretely relates to spiral vernier micrometer.

Background

When the length of an object is measured in a physical experiment, different measuring tools such as a meter ruler, a millimeter scale, a vernier caliper, a micrometer caliper and the like are generally required to be selected according to different requirements of measuring accuracy. The accuracy of a meter scale and a millimeter scale is usually 1mm, the accuracy of a vernier caliper is 0.1mm, 0.05mm and 0.02mm, and the accuracy of a micrometer caliper is 0.01 mm.

Under the condition of low measurement precision requirement, a millimeter scale is usually selected, if the measurement precision requirement is higher, a vernier caliper and a micrometer screw are selected, and the traditional micrometer screw can only accurately measure 0.01mm and cannot meet the increasing ultra-precision measurement requirement.

Disclosure of Invention

To the weak point among the prior art, the utility model provides a spiral vernier micrometer.

In order to achieve the above purpose, the utility model discloses technical scheme as follows:

a spiral vernier micrometer comprises a fixed wheel and a rotating wheel; the fixed wheel is provided with fixed scales which comprise integer scales, half-divided scales and rotary scales; the rotating wheel is provided with vernier scales which are divided into ten-grid vernier, twenty-grid vernier and fifty-grid vernier;

each grid of the fixed scales represents 0.01mm in length; the ten-grid vernier and the fixed scale 9 are in equal arc length, namely the length represented by each grid of the ten-grid vernier is 0.009mm, and is 0.001mm (1 um) smaller than the length represented by each grid on the fixed scale, namely 0.001mm (1 um) is the precision of the ten-grid vernier; the twenty-grid vernier and the fixed scale 19 are equal in arc length, namely the representative length of each grid of the twenty-grid vernier is 0.0095mm, and is smaller than the representative length of each grid on the fixed scale by 0.0005mm (0.5 um), namely the precision of the twenty-grid vernier is 0.0005mm (0.5 um); the fifty-grid vernier and the fixed scale 49 are equal in arc length, namely the length represented by each grid of the fifty-grid vernier is 0.0098mm, and is 0.0002mm (0.2 um) smaller than the length represented by each grid on the fixed scale, namely the precision of the fifty-grid vernier is 0.0002mm (0.2 um).

Has the advantages that: the utility model discloses simple structure combines slide caliper and micrometer caliper measurement function, can come with the reading of micrometer caliper's estimation reading position accuracy.

Drawings

Fig. 1 is a schematic structural view of the ten-cell vernier of the present invention.

Fig. 2 is a schematic structural view of the twenty-grid vernier of the present invention.

Fig. 3 is a schematic structural view of a fifty-grid cursor of the present invention.

In the figure, 1-fixed wheel, 2-rotating wheel, 3-fixed scale, 4-tenth grid vernier, 5-twenty grid vernier and 6-fifty grid vernier are used.

Detailed Description

The present invention is described below with reference to specific examples. It will be understood by those skilled in the art that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention in any way.

A spiral vernier micrometer comprises a fixed wheel (1) and a rotating wheel (2); the fixed wheel (1) is provided with fixed scales (3) which comprise integer scales, half-divided scales and rotary scales; the rotating wheel (2) is provided with vernier scales which are divided into ten-grid vernier (4), twenty-grid vernier (5) and fifty-grid vernier (6);

each grid of the fixed scales (3) represents 0.01mm in length; the ten-grid vernier (4) and the fixed scale (3) 9 are in equal arc length in grids, namely the length of each grid of the ten-grid vernier (4) is 0.009mm, and is 0.001mm (1 um) smaller than the length of each grid of the fixed scale (3), namely 0.001mm (1 um) is the precision of the ten-grid vernier (4); the twenty-grid vernier (5) and the fixed scale (3) 19 are equal in grid arc length, namely the representative length of each grid of the twenty-grid vernier (5) is 0.0095mm, and is 0.0005mm (0.5 um) smaller than the representative length of each grid on the fixed scale (3), namely the precision of the twenty-grid vernier (5) is 0.0005mm (0.5 um); the fifty-grid vernier (6) and the fixed scale (3) 49 are equal in arc length, namely the length of each grid of the fifty-grid vernier (6) is 0.0098mm, and is smaller than the length of each grid of the fixed scale (3) by 0.0002mm (0.2 um), namely the precision of the fifty-grid vernier (6) is 0.0002mm (0.2 um).

Claims (1)

1. A spiral vernier micrometer, characterized by: comprises a fixed wheel and a rotating wheel; the fixed wheel is provided with fixed scales which comprise integer scales, half-divided scales and rotary scales; the rotating wheel is provided with vernier scales which are divided into ten-grid vernier, twenty-grid vernier and fifty-grid vernier;

each grid of the fixed scales represents 0.01mm in length; the ten-grid vernier and the fixed scale 9 are in equal arc length, namely the length represented by each grid of the ten-grid vernier is 0.009mm, and is 0.001mm (1 um) smaller than the length represented by each grid on the fixed scale, namely 0.001mm (1 um) is the precision of the ten-grid vernier; the twenty-grid vernier and the fixed scale 19 are equal in arc length, namely the representative length of each grid of the twenty-grid vernier is 0.0095mm, and is smaller than the representative length of each grid on the fixed scale by 0.0005mm (0.5 um), namely the precision of the twenty-grid vernier is 0.0005mm (0.5 um); the fifty-grid vernier and the fixed scale 49 are equal in arc length, namely the length represented by each grid of the fifty-grid vernier is 0.0098mm, and is 0.0002mm (0.2 um) smaller than the length represented by each grid on the fixed scale, namely the precision of the fifty-grid vernier is 0.0002mm (0.2 um).

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