Design of a novel gas–liquid composite high-speed impact equipment and establishment of its dynamic mathematical model

This paper proposes a new type of gas–liquid composite high-speed impact equipment. Firstly, the structure and working principle of the new impact equipment were introduced. Compared with traditional liquid–gas hammers, its main structure feature is the separation design of the accumulator piston and hammer body. A dynamic theoretical analysis was conducted on the proposed new impact equipment to obtain the theoretical impact speed and the dynamic characteristics of the oil and gas coordination. Combined with AMEsim software, the pressure changes and hammer movement characteristics during the work process of the impact equipment were simulated, and the influence of oil discharge resistance on the impact speed was studied and analyzed. The results show that the new gas–liquid composite high-speed impact equipment proposed in this paper can achieve an impact velocity efficiency of about 90% within a wide working pressure range. Compared to traditional pneumatic hammers, its impact speed efficiency is less sensitive to changes in working pressure, and higher impact speeds can be achieved under the same working pressure. Finally, the impact test of the new equipment was conducted through experiments to verify its dynamic characteristics of pressure and impact velocity.