Circular spherical-curvature-surface concave-dial type levelness measuring instrument

Abstract

The invention relates to a circular spherical-curvature-surface concave-dial type levelness measuring instrument. The circular spherical-curvature-surface concave-dial type levelness measuring instrument is characterized by comprising a spherical-curvature-surface concave dial, a glass ball, a chassis, a press plate, an observing window and zero-position adjusting devices, etc., wherein the glassball is a regular sphere body and is arranged in the spherical-curvature-surface concave dial; the spherical-curvature-surface concave dial is fixedly arranged on a base equipped with the chassis through the press plate and bolts; the spherical-curvature-surface shell-like concave dial is made of a transparent substance, uses a semi-spherical fixed point as the point of a zero scale, and is provided with concentric circular scale line between the zero-scale point and a large circle of a spherical curvature surface; altogether two sets of the zero-position adjusting devices are arranged and aremounted on the side surface of the base to form an angle of 90 degrees; and the bottom surface of the chassis is an annular datum plane. According to the invention, by ingeniously utilizing the characteristics that the lightweight glass ball automatically searches for the lowest point under the effect of gravity and the lowest point of the semi-spherical surface shell-like concave deviates from the zero-scale point after the semi-spherical shell-like concave dial deflects, the deviation angle and direction of the levelness of a measured plane are judged according to the degree that the glassball deviates from the zero-scale position of the semi-spherical dial.

Description

technical field [0001] The invention relates to a levelness measuring tool, in particular to a concave disc type levelness measuring instrument with a circular spherical curvature surface. Background technique [0002] Levels are mainly used to test the flatness, straightness, verticality and horizontal position of equipment installation of various machine tools and workpieces; in equipment installation or infrastructure construction, plane levelness measurement is one of the important measurement methods to ensure construction quality one. At present, there are mainly the following methods for measuring plane levelness: frame level method, strip level method, disc level method, theodolite method, infrared level method, etc. The level tube or reference leveling tube of all the above levels are Made of glass, the inner wall of the level tube is a curved surface with a certain radius of curvature, and the tube is filled with liquid; the principle of measurement is that when t...

AI Technical Summary

Problems solved by technology

Due to its own structure and characteristics, the above-mentioned level has the following defects: 1. Because the liquid in the level has a great influence on the temperature, factors such as hand heat, direct sunlight, and breath will all affect the level; 2. The glass tube of the level The built-in liquid has a certain viscosity coefficient, which will also have a certain impact on the measurement accuracy; 3. The reading of the bubble is estimated, and there is error accumulation, and the accuracy is relatively poor; Adjustment, not easy to carry and other defects

Images