Abstract:

In order to solve the problem of fire cannon powered by high pressure gas, namely the quality of gas valve is too high and it is not easy to change the firing pressure. First of all, this paper designs a new type of fire bomb firing system with high pressure gas as power. This system uses the firing ring driven by the inner barrel. Then, by establishing the dynamic model and studying the characteristics of air pressure in different launch stages, the trajectory equations of fire extinguishing projectile in different launch stages are listed. Finally, the relationship between the angle of firing ring and the pressure of external barrel is analyzed, and the optimal parameters of firing ring are obtained. The experimental results confirm the analysis results, and show that the maximum range is 102.34 m when the elevation angle is 40° and the air pressure is 1.6 MPa, and the error rate of fire cannon can be controlled between 1.0% and 3.6%. The overall structure design of the fire cannon is reasonable, which provides a reference for similar forest cannon extinguishing devices.

Key words: machine design, fire cannon, hit ring, range of fire extinguisher