Air curtain protection device and protection method for laser cleaning

Abstract

The invention provides an air curtain protection device for laser cleaning and a protection method and can effectively collect pollutants in laser cleaning, guarantee cleanliness of a laser lens and prevent lens glass from being broken and damaged. The air curtain protection device for laser cleaning comprises a protection cover, a first air outlet array, a suction port and a second air outlet array, wherein the protection cover is provided with a horn-shaped inner chamber with a thin upper part and a thick lower part, the upper end of the inner chamber is in sleeve joint with the laser cleaning lens, and an opening is formed in the lower end of the inner chamber; the first air outlet array is formed in the side wall of the inner chamber, and protection space surrounding the laser lens is formed by compressed air exhausted by the first air outlet array and side walls; the suction port is formed sideways below the protection cover; the second air outlet array is formed in the peripheral edge of the lower end of the inner chamber, compressed air exhausted by the second air outlet array surrounds a laser irradiation area on the surface of a cleaned workpiece, and projection of air flow at each air outlet of the second air outlet array on the horizontal plane points to the suction port.

Description

technical field [0001] The invention relates to laser processing protection technology, in particular to an air curtain protection device and a protection method for laser cleaning. Background technique [0002] Laser processing technology is a technology that uses laser beams to interact with material materials to cut, weld, surface treat, drill and micro-process materials (including metals and non-metals). [0003] Laser cleaning is a kind of laser processing technology, which is a photophysical reaction between a high-intensity short-pulse laser and a contaminated layer. Its physical principle can be summarized as follows: [0004] a) The beam emitted by the laser is absorbed by the contamination layer on the surface to be treated. [0005] b) The absorption of large energy forms a rapidly expanding plasma (highly ionized unstable gas), which produces shock waves. [0006] c) The shock wave breaks the contaminants into fragments and is ejected. [0007] d) The light p...

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Problems solved by technology

[0010] However, the setting of the existing air blowing nozzles only roughly blows away the pollutants, and it is difficult to absolutely prevent a small amount of pollutants from penetrating or detouring to the vicinity of the lens through convection during the blowing away process, and if the glass of the laser lens is attached Pollutants will absorb and accumulate a large amount of heat, which will cause the lens glass to burst and damage, resulting in production loss. Moreover, if the pollutants are not collected effectively, the pollutants gasified by cleaning the metal surface are very toxic, which will bring harm to the health of the operators. to damage

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