1·The load impact which mainly determined the designation directly and indirectly put on the tube, gas chamber, pushing air cylinder, pitching machine, revolver and connecting parts.
炮管、气室、推动气缸、俯仰机构、转台和各部分连接件都要直接或间接承受冲击载荷，该载荷是灭火炮构件设计的主要依据。