Measuring device and measuring method for geometric parameters of inner wall of elbow

A technology of geometric parameters and measuring devices, applied in the direction of mechanical diameter measurement, etc., can solve the problems of inability to accurately measure the inner diameter and bending radius of the elbow, difficult to determine the rotation center and center line of the elbow, and affecting the test accuracy of the elbow flowmeter. Achieve the effect of automatic measurement, easy automatic measurement and scientific structure

Inactive Publication Date: 2010-10-06
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0004] Since the geometric parameters of the outer wall of the elbow have no effect on the velocity and pressure of the fluid in the pipe, usually only the inner wall of the pipe needs to be processed and measured. The wall thickness of the elbow is not uniform, and it is difficult to

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  • Measuring device and measuring method for geometric parameters of inner wall of elbow
  • Measuring device and measuring method for geometric parameters of inner wall of elbow
  • Measuring device and measuring method for geometric parameters of inner wall of elbow

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specific Embodiment

[0018] The present invention is made up of machine base 21, measuring turntable 20, transverse guide rail 19, longitudinal guide rail 8, vertical guide rail 6, column 3, measuring arm 10, measuring base 13 and probe 14 etc. composition. Specific examples are as follows:

[0019] See attached figure 1 , for the convenience of description, in this embodiment, the direction of the horizontal guide rail 19 is set as the X direction, the direction of the longitudinal guide rail 19 is set as the Y direction, and the direction of the vertical guide rail 6 is set as the Z direction. The three are perpendicular to each other to form a rectangular coordinate system, and the measuring arm 10 is parallel in the X direction.

[0020] The longitudinal guide rail 8 and the transverse guide rail 19 are perpendicular to each other and are fixedly installed on the base 21 . A column 3 is installed on the longitudinal guide rail 8, and the column 3 can move back and forth along the longitudina...

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Abstract

The invention relates to a measuring device and a measuring method for geometric parameters of an inner wall of an elbow, belonging to the testing instrument and meter field. The measuring device is provided with three motional freedom degrees and one rotational freedom degree, a measuring pin is installed at the tail end of a measuring arm for measuring overhanging and can rotate around the axle center of the measuring arm, and the pivot angle of the measuring pin can be manually regulated. In the measuring method for the geometric parameters of the elbow, the inner diameter and the bending radius of the elbow are measured by the measuring device, and the measuring process sequentially comprises the following steps: determining the center line plane of the elbow, measuring the bending radius and measuring the inner diameter of the elbow. The measuring method solves the problem on the measurement of the geometric parameters of the inner cavity of the elbow, and no locating surface needs to be additionally arranged in the measuring process, thus the invention achieves a large caliber application scope, and is especially applicable to occasions having higher requirements for the measurement accuracy of the geometric parameters of the elbow.

Description

technical field [0001] The invention belongs to the field of testing instruments and meters, and in particular relates to a measuring device and a measuring method for geometric parameters of the inner wall of an elbow, which are used for measuring the bending radius and the inner diameter of the elbow. Background technique [0002] Elbow flowmeter is a new type of differential pressure flowmeter, which uses the pressure difference between the inside and outside of the elbow at the right-angle bend on the pipeline and the geometric parameters of the inner wall of the elbow to calculate the fluid flow in the pipe. The ratio of the radius of curvature R of the centerline of the inner wall of the elbow to the diameter D of the inner wall of the elbow is called the bend diameter ratio K. Bend-to-diameter ratio is the most important geometric parameter affecting the flow characteristics of elbow flowmeters. Therefore, how to accurately measure the bending radius and inner diamet...

Claims

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Application Information

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IPC IPC(8): G01B5/12G01B5/08
Inventor 李占贤张进孟宪举李少峰安福波
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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