Method for detecting concentricity of combined pipes of different calibers

A detection method and combined tube technology, applied in the direction of measuring devices, mechanical measuring devices, instruments, etc., can solve the problems of complex structure of the device, errors, and easy occurrence of large, etc., to improve detection efficiency, reliable inspection quality, convenient and flexible measurement Effect

Active Publication Date: 2015-04-22
CHINA NUCLEAR IND HUAXING CONSTR
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the concentricity detection is generally done by lathes. The conventional method is to send it to an outsourcer for inspection. Not only does it take a long time, but also the components are easily deformed during transportation, which cannot ensure the quality of the inspection work.
[0003] As far as the applicant knows, Chinese patent CN103727867 discloses a concentricity detection device and method. This method uses a dial indicator to indirectly measure the concentricity of the central hole, which is limited to the measurement of the concentricity of the deep and small holes of the pipe. The device structure of this method is complicated. , prone to large errors

Method used

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  • Method for detecting concentricity of combined pipes of different calibers

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Embodiment 1

[0030] The method for detecting the concentricity of different-diameter combined pipes in this embodiment is as follows: figure 1 and figure 2 shown, including the following steps:

[0031] 1. A narrow tube and a thick tube are welded end to end to form 4 different-diameter combined tubes. The combined tube 4 is 1320mm long, of which the diameter of the thick tube is 114mm, and the diameter of the thin tube is 102mm.

[0032] 2. Make a concentricity detection device for combined pipes with different diameters. The detection device includes a fixing device, a precision leveling rod 2 and a precision leveling instrument 1. The fixing device includes two V-shaped supports 3 .

[0033] 3. Place the two ends of the combined pipe with different diameters 4 in the slots of the two V-shaped supports 3 and fix it by the weight of the combined pipe 4 itself, and then mark A, B, C, D on the end faces of the combined pipe with different diameters 4 Four orientations, two adjacent orien...

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Abstract

The invention relates to a method for detecting the concentricity of combined pipes of different calibers, belonging to the technical field of nuclear power station construction. The method comprises that the welded pipes of different calibers are horizontally placed on a fixing device, the pipes are fixed, a precise spirit level is used to measure the elevation of points in different directions of the pipes, theoretical elevation values of the different points are computed inversely via the distance between the points, and the central deviation of the pipes are obtained via calculation. The method can overcome the concentricity of the combined and welded pipes of different calibers is hard to detect, the method can be used to obtain accurate detection results, provides basis for practical position detection of the pipes, does not require a special lathe, is flexible in detection and convenient in measurement, and can satisfy requirements for quality control in onsite construction.

Description

technical field [0001] The invention relates to a method for detecting the concentricity of pipe materials, in particular to a method for detecting the concentricity of combined pipes with different diameters, and belongs to the technical field of nuclear power plant construction. Background technique [0002] The ring wall of the reactor chamber of the nuclear reactor building is equipped with eight sets of thrust-pull grooves, each set of thrust-pull grooves is composed of two sleeves with different diameters arranged inside and outside welded, and the sleeves are welded by two kinds of pipes, concentric with each other. High precision requirements, concentricity requirements of 1mm, a total of 16, divided into two specifications, the tube length is 1320mm and 1488mm. At present, the concentricity test is generally done by lathes. The conventional method is to send it to an outsourcer for inspection. Not only does it take a long time, but also the components are easily def...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B5/252
Inventor 单意志秦亚林钱伏华
Owner CHINA NUCLEAR IND HUAXING CONSTR
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