1. The metal surface at the starting point is heated to its ignition point by a preheated flame, and then a combustion reaction starts in the cutting oxygen.
2. The combustion reaction propagates to the lower layers of the metal.
3. The slag generated by the combustion reaction is removed and the metal is cut in the thickness direction.
4. Using the heat from the slag and the preheated flame, the upper layer of the metal at the leading edge of the cut is heated to the ignition point, where it continues to react with oxygen in a combustion reaction.
The above process is repeated, the metal cutting is carried out continuously.
Note: The ignition point of plain carbon steel was determined to be 970°C in the experiments of Kanichi Mizutsu and others, but the literature also indicates that the experimental value in other literature is 870°C. It is said that it may be due to the experimental method. It is said that may be caused by different experimental methods.
The big switch is the valve
The small switch is the switch that comes with the oxygen flow meter
1 Open the small switch first to release the remaining gas
2 Close the small switch
3 Open the big switch, on the one hand, blowing off the dust; on the other hand, checking the oxygen inside the tube to see if there is still oxygen
4 Connect the suction tube
5 Open the small switch. Oxygen flow rate is appropriate, long-term oxygen therapy patients, oxygen concentration should not be too high, 1-2L/min is appropriate, 24-hour oxygen therapy time> 15 hours. (Carbon dioxide retention of patients with oxygen concentration of not more than 2L / min, in order to improve lung function)
6 with oxygen tube. When the oxygen flow is small, you can immerse the open end of the tube in water and see bubbles coming out.
Stop Oxygen Suction
1 Remove the oxygen tube from your nose
2 Turn off the small switch
3 Turn off the big switch
4 Turn on the small switch (to release the remaining gas), turn off the small switch
5 Separate the tube from the oxygen suction device
6 Separate the oxygen suction device from the liquid oxygen bottle
Please note: When you turn on the switch (valve), you can see that there are bubbles coming out of the tube. Please note: When opening and closing the switch (valve), you can use the hand trigger, but please pay attention to the path
Oxygen absorbing tubes should be replaced regularly to avoid breeding bacteria. Regular oxygen tubing should be changed daily; de-bacterialized
Oxygen tubing should be changed twice a week
The distilled water in the humidification tank of the oxygen unit should be changed daily
Oxygen tubing should be changed twice a week.