Vernier caliper additionally provided with improved measuring pawls

Abstract

The invention discloses a vernier caliper additionally provided with an improved measuring pawl. The vernier caliper comprises a main ruler, a depth indicator disposed at one end of the main ruler, a vernier scale which is attached to the main ruler and can slide, and a first inner measuring pawl and a first outer measuring pawl which are fixed on the main ruler and the vernier scale. The first inner measuring pawl is disposed above the main ruler, the first outer measuring pawl is disposed below the main ruler, the improved measuring pawl sleeves the first outer measuring pawl from the bottom to the top, the pawl foot of the improved measuring pawl is provided with a cover plate with a nut hole, and the improved measuring pawl is fixed to the first outer measuring pawl by screwing tight a nut. According to the invention, on the basis of a conventional 0-200 mm universal vernier caliper, an improved inner measuring pawl and an improved outer measuring pawl are adaptively selected and additionally arranged, so that the test requirement of a special process is satisfied, and the application scope of the 0-200 mm universal vernier caliper is enlarged. The improved inner measuring pawl and the improved outer measuring pawl employ a common measuring tool steel material and are formed through lathe processing, what is needed is only fixation on the conventional 0-200 mm universal vernier caliper through an original screw, the installation is convenient, and the installation and application can be at any time and at any place. At the same time, a large amount of cost for purchasing professional calipers is saved.

Description

technical field [0001] The invention belongs to the field of power cable measurement, in particular to a vernier caliper equipped with improved measuring claws. Background technique [0002] Vernier calipers are the most commonly used instruments for measuring length in industrial manufacturing. The vernier caliper is composed of two parts, the main ruler and the sliding vernier attached to the main ruler. The main scale is generally in millimeters. According to the different divisions of the vernier, the vernier calipers can be divided into ten-degree vernier calipers, twenty-degree vernier calipers, and fifty-degree vernier calipers. Take the vernier caliper accurate to 0.02 mm as an example, the minimum graduation on the ruler body is 1 mm, there are 50 small equal division scales on the vernier ruler, the total length is 49 mm, and each division is 0.98 mm, which is smaller than the main scale. The graduations differ by 0.02mm. The main scale and vernier of the vernie...

AI Technical Summary

Problems solved by technology

However, in the production of ultra-high voltage cable corrugated metal aluminum sheath, the most commonly used 0-200mm vernier caliper cannot meet the measurement requirements of the inner and outer diameters of aluminum sheath bellows

[0004] The aluminum sleeve corrugated pipe is a spirally extended texture with a depth of 3mm-6mm and a pitch of 20-40mm that is rolled out on the surface of the continuously produced aluminum pipe. Due to the existing 0-200mm universal vernier caliper, the length of the inner measuring claw is 10mm, and the outer measuring claw The length is 35mm. Since the length of the inner measuring claw is smaller than the pitch length and the measuring end face of the outer measuring claw is too narrow, it is impossible to accurately measure the inner and outer diameter of the bellows. The error generated during the measurement is usually 2mm-4mm

[0005] Its disadvantages are: large errors in measurement, which is not conducive to the control of process parameters in the production process, causing product quality problems

And to buy a special one-way claw vernier caliper, the price is ten times that of the 0-200mm vernier caliper, and the cost is relatively large.

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