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Common problems of laser marking machine and their solutions

Writer: admin Time:2020-11-10 13:49 Browse:

  

  Fault 1: The laser intensity drops and the mark is not clear enough

  Solution:

  1 Whether the laser resonant cavity changes; fine-tune the resonant cavity lens. Make the output light spot good;

  2 The acousto-optic crystal shifts or the output energy of the acousto-optic power supply is low; adjust the position of the acousto-optic crystal or increase the working current of the acousto-optic power supply;

  3 The deviation of the laser entering the galvanometer: adjust the laser;

  4 If the current is adjusted to about 20A and the sensitivity is not strong enough: the krypton lamp is aging, replace it with a new one.

  Fault 2: Krypton lamp cannot be triggered (refer to NTP power supply manual)

  Solution:

  1 Check all power connections;

  2 The high-pressure krypton lamp is aging, replace the krypton lamp.

  Notes for operating the laser marking machine

  1 It is strictly forbidden to start the laser power supply and Q-switching power supply under the condition of no water or abnormal water circulation;

  2 No-load operation of the Q power supply is not allowed (that is, the output terminal of the Q power supply is suspended);

  3 If there is an abnormal phenomenon, first turn off the galvanometer switch and the key switch, and then check;

  4 It is not allowed to start other components before the krypton lamp is ignited to prevent high voltage from entering and damaging the components;

  5 Note that the output end (anode) of the laser power supply is suspended to prevent ignition and breakdown with other electrical appliances;

  6 Keep the internal circulating water clean. Clean the water tank regularly and replace it with deionized or pure water.

  Krypton lamp use and replacement

  1 Turn off the water cooler and the laser power supply.

  2 Open the upper three chamber covers, take out the lamp or crystal to be replaced, put it in after replacement, and install the chamber cover.

  3 Turn on the water cooler, the laser power supply, and adjust the laser power current to about (15~20)A. Place a small piece of wood or black paper between the front diaphragm and the beam expander, and you should see the spot formed by laser ablation. If not, slightly adjust the three knobs of the front diaphragm holder until light spots appear.

  4 After the laser is debugged, the three knobs of the front diaphragm holder should be adjusted repeatedly to make the light spot strong. If the laser is too strong or the brightness is too high, the power supply current can be reduced.

  5 Turn off the laser power.

  Special attention: the time to replace the krypton lamp

  The krypton lamp in the laser factory explains that the service life of the krypton lamp is 300 hours, but due to different user conditions, the above time cannot be used as a basis for replacing the krypton lamp. As the use time increases, the luminous efficiency of the krypton lamp decreases and the laser output also decreases. In order to obtain sufficient laser output, many users increase the current of the laser power supply to increase the luminescence of the krypton lamp, which accelerates the aging of the krypton lamp , Forming a vicious circle, sometimes leading to the phenomenon of light explosion. In order to prevent this phenomenon from happening, we recommend that users decide whether they should replace the krypton lamp according to the following method.

  When changing to a new krypton lamp, record the laser power current meter value during normal marking as the standard current value.

  When the krypton lamp gradually ages, increase the laser power current output, but the ammeter value should not exceed 1.25 times the standard current value.

  For example: the current value of the new krypton lamp is 20A when marking. After using for a period of time, if the current value is increased to 22.5A and the marking still fails, the krypton lamp should be replaced.

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