The invention discloses a
flue gas
trapping method for a gantry type
cutting machine, which is realized through a
flue gas
trapping device and comprises the following steps: firstly, starting a circulating fan and a dust removal mechanism, then starting
cutting work, and under the suction action of the dust removal mechanism and the circulating fan, enabling
cutting flue gas to enter a double-channel negative pressure air
pipe through a double-air-
pipe sliding connector, wherein one part enters the dust removal mechanism through the dust removal cavity to be purified, and the other part sequentially enters the connecting
pipe, the circulating air positive-
pressure pipe and the positive-pressure air pipe sliding connector through the circulating cavity and is discharged through the positive-pressure air pipe sliding connector. The gas exhausted from the
positive pressure air pipe sliding connector passes through the lower portion of the cutting platform to capture the cutting
smoke and then enters the double-air-pipe sliding connector again, and the process is repeated. On the premise of keeping 95% of
trapping efficiency, the ventilation quantity of the dust removal
system can be reduced by 40%, the operation
energy consumption of the
system is reduced by about 36%, and the environment-friendly and low-carbon effects are good.