Measuring method and device for deviation of shape of sealing head of pressure container

Abstract

The invention discloses a measuring method and device for the deviation of the shape of a sealing head of a pressure container, and belongs to the technical field of pressure containers. The measuring method comprises the following steps of: acquiring a two-dimensional pole coordinate value of a target point on the basis of a laser distance sensor and an angle sensor, implementing mapping after right-angled coordinate value transformation and least square fitting processing, determining the deviation of the shape in comparison with the standard shape of the sealing head, and automatically carrying out judgment on qualification. The corresponding measuring device comprises a positioning device, a sensor device and a computer, wherein the positioning device is used for connecting with the measured sealing head and installing the sensor device; the sensor device comprises the laser distance sensor, the angle sensor and a stepping motor which are respectively in controlled connection with the computer containing programs; the angle sensor is in coaxial butt-joint with the stepping motor; and the laser distance sensor rotates coaxially along the stepping motor. The measuring method and device disclosed by the invention have the advantages that the concept is novel; and based on a laser measuring technology, the intuitive, accurate and quantitative detection of the deviation of the shape of the sealing head can be realized, and a reliable scientific means is provided for measuring the deviation of the shape of the sealing head of the pressure container.

Description

Technical field [0001] The invention belongs to the technical field of pressure vessels, and particularly relates to a method and device for measuring the shape deviation of a pressure vessel head based on laser sensor technology. Background technique [0002] The head is one of the main components of pressure-bearing equipment such as pressure vessels. Common forms include spherical heads, elliptical heads, dish-shaped heads and other convex heads and conical heads, variable diameter sections, and flat plates. The three convex heads mentioned are the most commonly used heads. Under pressure, heads of different shapes have very different stress distributions and different stress levels. Outer shape of heads will cause stress increments, which may cause their local stress to exceed the allowable limit value and cause head failure . The current pressure vessel standards and specifications all put forward regulations and requirements for the shape deviation of the head. The manufa...

AI Technical Summary

Problems solved by technology

Using templates to check the shape deviation of the head, although simple and easy to do, cannot intuitively and accurately reflect the shape deviation of the various parts of the head, and there are many samples required for different head specifications, and there are many inconveniences in practical applications

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