Inner-bore laser measuring device

Abstract

The invention discloses an inner-bore measuring device. The inner-bore measuring device comprises a laser (1), a lower trapezoidal prism (3), an aperture diaphragm (4), a lens (5), an upper trapezoidal prism (6) and a charged coupled device (CCD) (7), wherein the lower trapezoidal prism (3) is positioned below the upper trapezoidal prism (6); the two trapezoidal prisms are arranged symmetrically relative to the lens (5); the aperture diaphragm (4) and the lens (5) are arranged between the lower trapezoidal prism (3) and the upper trapezoidal prism (6); the aperture diaphragm (4) is arranged in front of the lens (5) along a light path; and the CCD (7) is arranged above the upper trapezoidal prism (6) and is used for receiving a light signal emitted from the upper trapezoidal prism (6). Thedevice greatly reduces physical space required for measurement, has high measurement speed, high precision and low external influence, is convenient to install and debug, and can effectively compensate an error caused assembly.

Description

technical field [0001] The invention belongs to the technical field of linear dimension measurement, and in particular relates to an inner hole detection device, which is used for measuring the hole depth and diameter in the fields of inner hole detection and the like. Background technique [0002] Hole machining is one of the most important processes in metal cutting, accounting for about 33% of all metal cutting processes. With the continuous development of the machinery industry, aviation industry, and national defense industry, the processing and matching of hole shaft parts has become an important link in the machining process. The processing of hole parts is difficult and costly. It is a key process in the processing of cylinders, sleeves and pipe parts in mechanical products. The processing level is improved with the improvement of the detection level. While precision or ultra-precision machining is proposed for small-sized holes or shaft parts, higher requirements f...

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Problems solved by technology

[0004] Pneumatic and electric measurement methods are gradually unable to meet the requirements of industrial measurement due to their low measurement accuracy; machine vision methods can measure the outer diameter of small holes with high precision, but machine vision methods are optical methods for active measurement without additional The light source is powerless to the parameters inside the small hole; the optical fiber small hole measurement method measures the aperture by receiving the light intensity of the reflected light, and this measurement method is greatly affected by factors such as the surface roughness and cleanliness of the inner wall to be tested , Secondly, due to the small hole diameter and the limitation of physical space, the installation and debugging of the sensor probe will also be greatly restricted

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