Automatic measuring device and method for inner wall of cavity part

Abstract

The invention discloses an automatic measuring device for the inner wall of a cavity part. The device comprises a precession mechanism and a lead screw. The precession mechanism is in threaded connection with the lead screw, one end of the precession mechanism is provided with a driver, the other end of the precession mechanism is fixedly connected with a supporting frame, the driver can drive theprecession mechanism to rotate on the lead screw to move in an axial direction of the lead screw, and a vision measuring mechanism is arranged on the lower portion of the precession mechanism; and the driver is further provided with an encoder, and the encoder is electrically connected with the visual measuring mechanism. The specific method for measuring by using the measuring device comprises the following steps: step one, setting an initial coordinate system; step two, collecting images and calculating data; and step 3, carrying out data conversion. According to the measuring device and the measuring method, the lead screw serves as the positioning reference, mark points do not need to be pasted to the measured object in the measuring process, the mark points do not need to be removedafter measurement is completed, calculation of coordinate conversion is simplified, and three-dimensional measurement can be conducted on the inner wall of the cavity part without manual intervention.

Description

technical field [0001] The invention relates to the technical field of part measurement, in particular to an automatic measurement device and a measurement method for the inner wall of a cavity type part. Background technique [0002] The internal space of cavity parts is limited, and it is inconvenient to measure with traditional coordinate measuring machines. In order to solve the detection of the inner wall size of cavity parts, non-contact optical measurement methods have appeared in the prior art, such as line laser scanning measurement methods or surface structured light scanning measurement methods. [0003] The method of line laser scanning to measure objects is to project a beam of high-brightness line laser onto the surface of the object, and use a camera to photograph the surface of the object to obtain the surface image of the object including the laser line image, and extract the center of the laser line image through image processing methods According to the p...

AI Technical Summary

Problems solved by technology

The above-mentioned non-contact optical measurement method cannot obtain complete three-dimensional data on the surface of the measured object through a single measurement. When performing multiple measurements, it is often necessary to carry out coordinate systems of different measurement data through the marker points pasted on the surface of the measured object. However, the internal space of cavity parts is limited, and it is difficult to paste and remove the marking points, which brings great difficulties to its measurement.

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