Gas protection device for work window

Abstract

The invention discloses a gas protection device for a work window. The device comprises a window lens fixing base, a window lens, a gas mixing cavity partition board, a flow guide plate, a window lens pressing plate, a rapid joint, a gas pipe and braided fabric; the window lens is fixed to the window lens fixing base through the window lens pressing plate, the gas pipe is mounted to the gas protection device through the rapid joint, a gas mixing cavity is formed by the window lens fixing base and the gas mixing cavity partition board, braided fabric arranged in the gas mixing cavity is arranged to be used for atomizing gas passing through the gas pipe so as to enable the gas to be evenly dispersed in the gas mixing cavity, the side, away from the window lens, on the gas mixing cavity partition board is provided with a length gas way with the direction perpendicular to the gas flow direction blown to the window lens, the section of the length gas way is in a strip shape, the length of the lens gas way is equal to that of the window lens, a slit is formed by the flow guide plate, the gas mixing cavity partition board and the window lens fixing base, and therefore gas blown out of the gas mixing cavity through the gas way can be evenly blown out to form the jet flow, and powder and various decomposing objects raised in the machining process of a power bed 3D printer can be blown away.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, in particular to a gas protection device for a working window. Background technique [0002] During the working process of the powder bed 3D printer, after the laser enters the scanner, the powder plane in the processing cabin is scanned through the window mirror according to the computer slicing graphics. The processing cabin is filled with dust particles and small molecular organic gases. Molecular gases pollute the laser system and cause damage to optical components, which leads to quality problems in the printed parts during the 3D printing process. In order to prevent the dust and small molecule organic gas in the processing cabin from entering the laser system sealing room, a sealing device is set between the laser system sealing room and the processing cabin; A window mirror made of ZnSe crystal that can project laser light efficiently is installed within the range where the laser be...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention provides a gas protection device for the working window, which can spray a uniform airflow to protect the observation window or the working window. The combination of the air cavity partition realizes the purpose of gas protection for the window mirror installed in the range where the laser beam needs to pass between the laser system sealing room and the processing cabin during the use of the selective laser sintering equipment, avoiding the window The problem that the mirror is polluted by dust and small molecule gas

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