The first is that the high-pressure oxygen is turned on too much. Many masters who use oxygen cutting, because they are used to cutting with their hands, are always used to turning the oxygen switch to the end. When using a portable CNC flame cutting machine, the sensitivity of solenoid valve adjustment is very high, and its can withstand air pressure range is relatively small, generally 0.5 as the boundary. It is very sensitive within this pressure. When the pressure is greater than this pressure, it will turn off. The situation that is not strict or can not be closed occurs. Therefore, when the CNC flame cutting mechanism is not capable of cutting oxygen, first check the pressure gauge to see if the oxygen pressure in the tube is within the normal range.
The second factor is the presence of impurities in the air valve controlled by the electronic valve, which hinders the normal closing, so after the shutdown command is sent, the cutting oxygen still does not close well. When this happens, first remove the cutting oxygen solenoid valve, then pull out the air valve, release the air and check the air needle. In many cases, the impurity blocking the air needle is very small, which is the size of the hair. Just get angry. In this way, reinstall it in accordance with the disassembly method.