CN-121988571-A - Transmission type cleaning head for laser cleaning

Abstract

The invention discloses a transmission type cleaning head for laser cleaning, which comprises an optical fiber laser output end, a focusing lens, a rotating prism and a motor, wherein the focusing lens is arranged on a guide rail and can move, laser beams output by the optical fiber laser output end sequentially pass through the focusing lens and the rotating prism to form offset, the motor drives the rotating prism to rotate, and the transmission type cleaning head also comprises a cylindrical mirror, and the cylindrical mirror is arranged at the rear part of the rotating prism. The output end of the fiber laser is arranged between the one-time focal length and the two-time focal length of the optical axis of the focusing lens. The motor is a hollow DC brushless motor. The transmission type cleaning head for laser cleaning has the advantages of simple design, low realization cost, laser power exceeding kilowatts, continuous laser beam and high practical value and popularization value.

Inventors

• CHEN JIAN

Assignees

• 陈健

Dates

Publication Date

20260508

Application Date

20240408

Claims (3)

1. 1. A transmission type cleaning head for laser cleaning is characterized by comprising an optical fiber laser output end (1), a focusing lens (2), a rotating prism (3) and a motor (4), wherein the focusing lens (2) is arranged on a guide rail and is movable, a laser beam (6) output by the optical fiber laser output end (1) sequentially passes through the focusing lens (2) and the rotating prism (3) to form offset, the motor (4) drives the rotating prism (3) to rotate, the transmission type cleaning head further comprises a cylindrical mirror (5), and the cylindrical mirror (5) is arranged at the rear part of the rotating prism (3).
2. 2. A transmissive cleaning head for laser cleaning according to claim 1, characterized in that said fiber laser output (1) is arranged between one focal length and two focal lengths of the optical axis of the focusing lens (2).
3. 3. A transmissive cleaning head for laser cleaning according to claim 1 characterized in that the motor (4) is a hollow DC brushless motor.

Description

Transmission type cleaning head for laser cleaning Technical Field The invention relates to the technical field of transmission type cleaning heads for laser cleaning, in particular to a transmission type cleaning head for laser cleaning. Background The laser cleaning technology is to irradiate the surface of the workpiece with high energy laser beam to evaporate or peel off the dirt, rust or coating on the surface instantaneously and to eliminate the attached matter or coating on the surface of the cleaning object effectively at high speed to reach the aim of cleaning. The laser cleaning technology is a new technology based on the interaction effect of laser and substances, is different from the traditional mechanical cleaning method, chemical cleaning method and ultrasonic cleaning method, does not need any CFC organic solvent which damages an ozone layer in laser cleaning, has no pollution and noise, is harmless to human bodies and environment, and is a green cleaning technology. Laser cleaning is a process of removing material from a solid (or sometimes liquid) surface by irradiation with a laser beam. At low laser fluxes, the material absorbs laser energy to heat and evaporate or sublimate. At high laser fluxes, the material typically converts to a plasma. Typically laser cleaning refers to the removal of material with a pulsed laser, but if the laser intensity is high enough, a continuous wave laser beam may be used to ablate the material. The current laser cleaning market mainly adopts pulse fiber lasers with average power below 500 watts to clean by adopting reflective scanning such as galvanometer or turning mirror, and the laser cleaning head is difficult to bear continuous fiber lasers with average power above ten watts. The pulse fiber laser with the power higher than 1000 watts is expensive, and further the output power of the pulse fiber laser is difficult to improve, so that the pulse fiber laser is difficult to be used in industries with high cleaning efficiency requirements, such as shipbuilding and the like. Disclosure of Invention The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a transmission type cleaning head for laser cleaning. In order to solve the technical problems, the technical scheme is that the transmission type cleaning head for laser cleaning comprises an optical fiber laser output end, a focusing lens, a rotating prism and a motor, wherein the focusing lens is arranged on a guide rail and can move, laser beams output by the optical fiber laser output end sequentially pass through the focusing lens and the rotating prism to form offset, the motor drives the rotating prism to rotate, and the transmission type cleaning head further comprises a cylindrical mirror, and the cylindrical mirror is arranged at the rear part of the rotating prism. As an improvement, the output end of the fiber laser is arranged between the one-time focal length and the two-time focal length of the optical axis of the focusing lens. As an improvement, the motor is a hollow direct current brushless motor. Compared with the prior art, the invention has the advantages that the focusing lens with the focal length of 150mm is adopted, and the 30-degree isosceles prism is used as the rotating prism. The focusing lens is positioned at the position of 180mm of the light outlet point at the output end of the fiber laser, the imaging light spot is positioned at the position of 1000mm behind the lens theoretically and deviates from the optical axis by 322mm, and after the rotating prism rotates around the optical axis, an aperture with the diameter of 644mm is formed, and the cleaning head is moved, so that the aim of cleaning is fulfilled. A single focusing lens made of quartz glass is selected, the hydroxyl content and the metal ion content are less than 1ppm, and two quartz lenses or one aspheric lens are adopted to correct the aberration of an optical system, so that formed light spots are as small as possible, and the light spots are uniform and concentrated, so that the phenomenon of cleaning omission does not occur. When the output end of the fiber laser is located between one and twice of the focal length of the focusing lens, the laser beam passes through the focusing lens to form a converging beam. The light beam enters the deflection prism after passing through the focusing lens to deflect the light beam (as shown in figure 2), the deflection angle is determined by the angle of the top angle of the deflection prism, the light spot forms a circular light beam after the deflection prism rotates around the optical axis, and when the deflection prism rotates for one circle, the scanning work is completed, and the radius of the circular light beam is determined by the position of the laser beam waist, the focal length of the lens, the top angle of the prism and the like. After the deflection prism, a cylindrical mirror is added, so that the circular