Novel light-gas gun firing mechanism

The invention discloses a novel light-gas gun firing mechanism which is characterized in that a bullet is arranged at a proper position in a firing tube in advance, and a diaphragm assembly is additionally arranged on a gas release port. High-pressure gas enters a cavity in the rear end of a piston in the air cylinder through an air inlet valve to push the piston to move forwards until the piston blocks the opening of the launching pipe. And gas in the cavity at the rear end of the piston enters the expanded space in front of the piston through capillary pores in the piston and is led to a high-pressure chamber. And when the gas pressure of the high-pressure chamber reaches a preset value, a percussion state is entered. During percussion, the membrane breaking device breaks the membrane of the membrane assembly, gas behind the piston suddenly relieves pressure, the piston moves backwards under the action of gas in an expansion space in front of the piston and the pressure of a high-pressure chamber, a sealing