Design And Test Verification Of Acceleration Hammer Source Mechanical System

Due to characteristics such as safety, green environmental, high efficiency, broad-band excitation and easy relocation, the accelerated weight drop has been widely used in geological prospecting of shallow layer. However, it has some problems in applications, for example, insufficient single shot energy, poor orientation precision and damping effect, out of sync release. Therefore, it is necessary to design a set of mechanical system to solve these core problems.Firstly, based on data research and design target, the working principle of the equipment was researched. Then, designed a new set of accelerated weight drop and established its 3D model.Secondly, impact mechanism researchment based on the pneumatic system dynamic properties was carried out, taking the theoretical calculation of impact energy as breakthrough. Further more, the static intensity of key components were checked by static analysis and the hammer model was verified by dynamics analysis. It shows that the impact energy is the biggest when the pipe's diameter is 64mm. In this case, even if the efficiency of impact cylinder is 0.7, the impact energy can still reach 62.8kJ, which meets the requirement that the impact energy should be greater than 60kJ. Besides, all the components meet the strength requirements under the static condition. Moreover, the dynamic structure strength of mechanical system meets the design requirement via checking and adjusting.Finally, experiment verification was made for dynamic properties analysis of the pneumatic system and dynamic simulation of the hammer model. By acquisition and analysis of the temperature difference during peening process, equilibrium pressure, hammer speed, the stress of each measurement point, we can see that the isothermal assumption during the dynamic properties analysis is feasible. And, it proved that the value of impact energy computed by dynamic algorithm is closer to experimental values than the conventional algorithm. In addition, it confirmed that the set of load and boundary conditions for dynamics simulation is reasonable.This paper completed the structure design for a set of accelerated weight drop, perfected the theory of impact energy calculation, checked the static intensity and dynamical stress, and finished the experimental study. Research shows that the theoretical study basically tally with the test. The new designed accelerated weight drop can meet the demands.