Method for measuring roundness of large cylinder

A cylinder and roundness technology, applied in the field of cylinder roundness measurement, can solve the problems of low accuracy and reliability, large impact on the installation period of the unit, and long measurement process.

Active Publication Date: 2017-05-31
CHINA GEZHOUBA GROUP CO LTD
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Problems solved by technology

Because it is easily affected by human factors, the accuracy and reliability of this measurement method are not high, and the measurement process takes a long time, which has a great impact on the installation period of the unit

Method used

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  • Method for measuring roundness of large cylinder
  • Method for measuring roundness of large cylinder

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Embodiment Construction

[0024] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0025] Such as Figure 1-2 Shown:

[0026] Step 1: When the cylinder 1 is assembled before installation, measure the position of the central axis of the cylinder 1, establish a coordinate system with the central axis of the cylinder as the axis, and use the datum transformation method to calibrate the coordinates of the centerline datum mark point 5 of the cylinder 1 .

[0027] Large cylinders are generally composed of multiple circular components, such as guide bearings, central bodies, shaft connections, external structures, etc. The central axis of the cylinder is the datum of the assembly of the cylinder and the datum of the roundness measurement of the cylinder, and its central position is generally determined by the cylindrical guide bearing. Determining the center line of the cylinder is the premise of this technical solution. During the assemb...

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Abstract

The invention provides a method for measuring roundness of a large cylinder. The method comprises the following steps: 1) determining the position of a central axis of a cylinder, establishing a coordinate system with the central axis of the cylinder being an axis, and calibrating coordinates of cylinder center datum mark points on the cylinder through a datum transformation method; 2) setting cylinder roundness measurement control points and carrying out measurement; and 3) establishing a cylinder roundness measurement local area network and measuring the roundness of the cylinder. An absolute laser tracker is introduced, so that under the condition of narrow and small space and hard datum point measurement, the roundness of super-large cylinders, such as a hydro-generator rotor and a stator, can be measured, and measurement accuracy and reliability are improved.

Description

technical field [0001] The invention relates to a method for measuring the roundness of a cylinder, in particular to a method for measuring the roundness of a super-large cylinder with high precision and fast. Background technique [0002] The diameter of circular components such as the outer diameter of the rotor and the inner ring of the stator of a large hydro-generator is generally 10m to 20m. The roundness accuracy of these components is required to be high, and the roundness needs to be measured during the assembly process. For the roundness detection of these components, at present, equipment and tools such as a round frame, a displacement dial indicator, and a hammer line are usually used, and the electric measurement method is used to jointly measure and complete. Because it is easily affected by human factors, the accuracy and reliability of this measurement method are not high, and the measurement process takes a long time, which has a great impact on the install...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24
CPCG01B11/2408
Inventor 江小兵吴光富陈强程志华刘宇鉴
Owner CHINA GEZHOUBA GROUP CO LTD
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