Fire detection method and fire detection device

Abstract

The invention discloses a fire detection method and a fire detection device. The laser output signal is compared with the flame appearance signal Q, and whether the equipment is in an abnormal state of fire and combustion or not is judged according to the duration of a single laser output signal and the accumulated number of the flame appearance signal Q in the duration of the single laser outputsignal when the laser output signal outputs laser; and when the laser output signal does not output the laser, whether the equipment is in an abnormal state of fire and combustion or not is judged according to the accumulated number of the flame occurrence signals Q in the accumulated detection period. The method comprises the following steps: a flame occurrence signal Q in a period when a laser output signal does not output laser and under the condition of single laser signal processing is acquired; the two characteristics are accumulated as an important basis and used as a final judgment basis for ignition combustion, ignition of the processed material W can be detected as soon as possible during laser processing of the laser processing machine, so that fire disasters are inhibited, andthe method has good universal applicability.

Description

technical field [0001] The invention relates to a fire detection method and a fire detection device. Background technique [0002] CO 2 Laser light is easily absorbed by non-metals. Materials such as paper, wood, acrylic, rubber, leather, etc. can absorb almost 100%, so the energy efficiency is good, so that it is possible to cut thicker processed materials with less laser energy. For example, a 40W CO 2 The laser is capable of cutting acrylic sheets up to 10mm thick in one laser cutting process. [0003] So, CO 2 Laser processing machines are used in various fields, not only in the field of metal processing, but also in the field of non-metal processing. In metal processing applications, since the material to be processed is metal, fires hardly occur. However, in non-metal processing applications, especially in the cutting mode (vector mode) that cuts the processed material into a specified shape, the energy of the laser stays in the same part of the material for a lo...

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Problems solved by technology

The application claims that the purpose of quickly extinguishing the fire can be achieved, but the main reason is that a fire extinguishing unit is installed nearby. In terms of how to timely and accurately detect whether there is a fire and suppress the occurrence of the fire from the source, the application has also not done research.

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