Non-contact type on-line detector for piston pin external diameter

Abstract

The invention discloses a non-contact device for online measurement of the outer diameter of a piston pin. A light source, a first lens, apertures, a second lens, a V-shaped groove, an objective lens and a planar CCD are sequentially disposed on a guide track and positioned on the same optical axis, a measured piston pin is disposed inside the V-shaped groove, and the planar CCD is connected with a computer via a data acquisition card. The measured piston pin is provided with uniform parallel lights by a Kohler illumination system to allow the upside contour of the measured piston pin to be imaged on the planar CCD sensor, and the outer diameter of the piston pin can be determined by image processing and calibrating the imaging part of the piston pin, so as to overcome the limitation of the CCD area to the size of the measured piston pin. Meanwhile, the invention uses sub-pixel image processing method, so as to overcome the influence of the CCD resolution to measurement accuracy. The invention has the advantages of rapid operation, remarkably improved measurement efficiency, and remarkably improved measurement accuracy arising from the sub-pixel image processing method.

Description

technical field [0001] The invention relates to a length measuring device, in particular to a device for non-contact online detection of the outer diameter of a piston pin. Background technique [0002] Piston pin is one of the most critical components in automobile and motorcycle engines. my country is the production base of piston pin in the world. As the competition in the automotive industry has entered a white-hot stage, the requirements for engine performance and quality are getting higher and higher. The outer diameter size and accuracy of the piston pin are one of the decisive factors affecting the performance of the engine. In order to further ensure the performance of the engine, the piston pin must be strictly inspected in the production of the piston pin. [0003] Due to the large production volume, easy wear and low price of piston pins, some domestic enterprises use contact-type online detection devices, but the detection efficiency is relatively low. Foreign ...

AI Technical Summary

Problems solved by technology

[0003] Due to the large production volume, easy wear and low price of piston pins, some domestic enterprises use contact-type online detection devices, but the detection efficiency is relatively low. Foreign piston pin online detection devices have high detection efficiency and precision, but the equipment is expensive. Most of the piston pin production enterprises in the world use the method of manually using the torsion spring instrument to sample the piston pins. Although this can save the cost of purchasing foreign piston pin online testing equipment, the testing efficiency is very low and the product testing quality cannot be obtained. Guaranteed, in danger of low-end competition in the international market

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