Optical precision measurement developer spraying device

Abstract

The invention discloses an optical precision measurement developer spraying device, which relates to the technical field of three-dimensional optical precision measurement and comprises an atomization mechanism, a transparent liquid storage tank and an automatic stirrer I, wherein the transparent liquid storage tank is used for storing liquid paint; one end of the automatic stirrer I is arranged on an upper cover of the transparent liquid storage tank, and the other end of the automatic stirrer I extends into the transparent liquid storage tank; the lower end of the transparent liquid storage tank is directly connected with the atomization mechanism through a liquid inlet transfer tool, the atomization mechanism is connected with an external gas circuit, and the external gas circuit is used for providing compressed gas needed by atomization of the liquid coating; the device can realize long-time, uniform, rapid and automatic spraying of the optical imaging agent, is used for pretreatment of optical precision measurement of high-reflection parts, and is beneficial to improving the measurement precision of optical three-dimensional measurement point cloud coordinates of the high-reflection parts.

Description

technical field [0001] The invention relates to the technical field of three-dimensional optical precision measurement, in particular to an optical precision measurement imaging agent spraying device. Background technique [0002] The basis of the structured light three-dimensional measurement method is the reflection of light. The reflection of sufficient intensity can bring good measurement results, but the excessive reflection will cause the image to be saturated. In the actual measurement, if the surface reflectivity of the object is high, the image will be saturated, and the saturated image will bring a large phase error, which will affect the measurement accuracy of the point cloud coordinates of the part. Therefore, when using raster projection scanners, line laser scanners and other 3D optical measurement equipment based on the principle of structured light measurement to measure the contour point cloud coordinates of parts with highly reflective surfaces, it is alwa...

AI Technical Summary

Problems solved by technology

[0005] 1) Coating thickness: In the commercial grade DPT-5 filling imaging agent 4 or similar products, the titanium dioxide powder particles are relatively large, with an average particle size of 150nm, and the thickness of the titanium dioxide diffuse reflection layer formed after spraying is thick; using structured light three-dimensional scanning When the method measures the sprayed part, it actually measures the three-dimensional point cloud coordinates of the titanium dioxide coating. If the coating is thick, it cannot reflect the real contour point cloud information of the part. Therefore, this method is not suitable for high-precision machining. Powder spraying treatment before optical precision measurement of reflective surface parts;

[0006] 2) The nozzle diameter at the front end of the liquid tank is relatively large, and the nozzle diameter is usually 0.8mm to 1.0mm, resulting in poor atomization effect of the optical developer, and the formed droplets are relatively large and fall on the surface of the part. After the liquid volatilizes, it is easy to form titanium dioxide White spots cause uneven thickness of the powder layer and affect the measurement accuracy of structured light 3D scanning;

[0007] 3) When spraying, the operator shakes the liquid tank to mix the paint evenly, and then manually presses the valve of the liquid tank, and the liquid paint is sprayed out with the compressed gas. The spraying flow rate of the atomized paint is greatly affected by human factors, resulting in repeated spraying of the same part , the thickness of the powder layer on the surface of the part is poor, and the uniformity of the powder layer thickness in different parts of the part is poor for a single spraying of the same part, which will also affect the measurement accuracy of the structured light 3D scanning; in addition, the spraying amount is limited by the compressed gas capacity of the liquid tank, resulting in spraying efficiency Low, the labor intensity of the operators is high, and it is not suitable for the spraying of large parts and the efficient spraying of parts batch testing;

[0013] But, the shortcoming of this kind method is: (1) the volume of the small-sized liquid storage tank 5 that the artist airbrush carries is only 20ml, and when spraying larger-sized parts, need repeatedly to pour into coating, spraying work efficiency is low; 2) The paint will settle freely in the small liquid storage tank 5, resulting in a large concentration of paint in the lower layer of the small liquid storage tank 5, and a small concentration of paint in the upper layer, resulting in poor consistency of coating thickness before and after the spraying process; (3) the spraying The method is still manual spraying, which cannot realize efficient automatic spraying of parts to be tested in batches, the spraying efficiency is low, and the labor intensity of the operators is high

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