Optical length adjustment device of numerical control laser cutting machine

Abstract

The invention discloses an optical length adjustment device of a numerical control laser cutting machine, which relates to the numerical control laser cutting machine. The optical length adjustment device comprises a laser generator, a cutting head for forming cutting laser spots on the surface of a work piece by utilizing a lens, a conduction optical path for connecting the laser generator with the cutting head, a beam guide rail and a controller. The optical length adjustment device is characterized by being further provided with an aplanatic device and a length compensation deice of the aplanatic device, wherein the aplanatic device comprises a trolley driven by a servo motor and at least one compensating reflecting mirror arranged on the trolley; the servo motor is connected with the controller; the compensating reflecting mirror is arranged in the conduction optical path in a zigzagging way; an emission reflecting mirror and a receiving reflecting mirror matched with the conduction optical path are arranged in the conduction optical path; and the aplanatic length compensation deice comprises a rail which is arranged on the traveling track of the trolley and has a length greater than that of the beam guide rail. The optical length adjustment device can ensure that the length of the optical path from the laser generator to the cutting head is consistent when the cutting head is at any point between (0, 0) and (a, b).

Description

Technical field [0001] The invention relates to a numerical control laser cutting machine, in particular to the design and improvement of the optical path device of the numerical control laser cutting machine. Background technique [0002] During the cutting process of the laser cutting machine, the laser beam is focused into a small spot, so that the focal point reaches a high power density. At this time, the heat input by the beam far exceeds the part reflected, conducted or diffused by the material, and the material is quickly heated to the melting and vaporization temperature. At the same time, a high-speed airflow will melt and vaporize from the coaxial or non-coaxial direction. The material is blown out from the lower part of the material. With the relative movement of the beam and the material, the hole forms a narrow slit to divide the material. [0003] At present, due to cost reasons, the laser beam emitted by the laser generator used for civil use has a certain diverge...

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Problems solved by technology

[0009] The above three methods are complex in structure, difficult to apply, and extremely expensive

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