Semi-automatic impact testing machine

The utility model discloses a semi-automatic impact testing machine, which relates to the technical field of impact testing instruments and comprises a testing machine body, and a sample placing table, a pendulum shaft and a motor are arranged on the testing machine body. The testing machine further comprises a centering mechanism, and the centering mechanism is arranged on the testing machine body. The transmission mechanism comprises a connecting assembly, a pushing assembly and a clamping assembly; the connecting assembly is in sliding connection with the clamping mechanism. The centering mechanism facilitates quick centering operation when a test sample is placed, ensures that a tangent line on the test sample is aligned with the center on a sample placing table of the semi-automatic impact testing machine, and ensures the measurement precision; the connecting assembly can be intermittently connected with the pendulum shaft which drives the pendulum bob to rotate, so that the pendulum shaft is separated f