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Method and device for optically measuring external threads

An external thread and thread technology, which is applied in the field of optical measurement of external threads, can solve problems such as inability to measure pipe threads, and achieve the effect of improving efficiency and reducing the risk of complaints.

Active Publication Date: 2010-03-31
瓦卢莱克德国有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] However, pipe thread measurement cannot be performed with this device because the thread cross-sectional shape is not detected

Method used

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  • Method and device for optically measuring external threads
  • Method and device for optically measuring external threads
  • Method and device for optically measuring external threads

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Experimental program
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Embodiment Construction

[0058] FIG. 1 a shows a schematic diagram of a device according to the invention for determining the thread profile of an external thread on a pipe.

[0059]In order to increase efficiency, ie to shorten the assay time, the device is provided with two assay units 2 which are arranged opposite to each other with respect to the tube cross section.

[0060] The measuring unit 2 consists of an illuminating device 5, 5' fastened to a support 3 and a camera 4, 4' which is adjusted in a backlit arrangement so that the thread 6 of the pipe 1 to be measured is illuminated tangentially to the pipe cross-section or Scanning and images of the thread profile are captured by a camera.

[0061] According to the invention, the lighting devices 5 , 5 ′ and the cameras 4 , 4 ′ are designed for telecentric light.

[0062] Subsequently, the optical signal is processed by a processing unit (not shown here) and compared with a setpoint value to be maintained.

[0063] According to the invention, ...

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Abstract

The invention relates to a method and device for optically measuring external thread profiles, particularly at the ends of pipes, wherein the thread is previously synchronously produced in a production line and is continuously measured in line from start to finish of the thread prior to further processing. The aim of the invention is to allow cost-effective inspection of the thread during synchronous production of the thread. For this purpose, the profile of the previously produced thread is illuminated and / or scanned tangentially to the pipe cross section by means of a relative movement including rotation and translation, and by an optical measuring unit comprising a camera, and the scanning speed is adjusted such that the time for scanning the thread profile, considering the required local resolution of the camera, is within the cycle time for the production of the next thread, wherein the image of the thread contour is captured by the camera and the optical signals are then evaluated and compared to target specifications.

Description

technical field [0001] The invention relates to a method and a device for optically determining an external thread, in particular an external thread on a pipe, according to claims 1 and 4 . Background technique [0002] For example, pipes of lines for conveying fluids, especially under pressure, such as gas or oil, are provided with an external thread. Wherein, the pipe is provided with an external thread at the end, and is screwed together with a casing element having an internal thread. [0003] For these pipelines under pressure, high demands are placed on the tightening and therefore on the quality of the threads. [0004] Such pipes are used, for example, as bushings (protection pipes) and conduits (standpipes) when conveying oil or gas. [0005] Typical outer diameters of such tubes are 60.3 mm to 177.8 mm in which threads are cut with up to 48 thread runs. [0006] The quality inspection of cut pipe threads requires a geometric determination of the shape of the thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24
CPCG01B11/2425G01B11/2433
Inventor H·施克文德纳W·汉格斯特恩伯格A·皮内泽
Owner 瓦卢莱克德国有限公司
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