The reason why the bicycle pump does not get in the air:
1. When the gas cylinder and the gas nozzle are connected, the gas needle is not pressed into the gas nozzle, so that the compressed gas cannot enter the gas nozzle. Solution: When the gas cylinder and the gas nozzle are connected, there must be a downward pressure action to ensure that the gas needle is pressed into the gas nozzle before pumping.
2. The air outlet of the air cylinder is blocked, so that the compressed air cannot enter the air nozzle. Solution, decompose the gas cylinder to find the plugging point and clean it before pumping.
3. Poor connection between the gas cylinder and the gas nozzle, causing air leakage. The solution is to reconnect the air cylinder and the air nozzle accurately, and ensure that the air needle is pressed into the air nozzle before pumping.