Abstract: Aiming at the problems that the deficiency of pop-up safety of pendulum impact testing machine and the accidental release of pendulum can cause some potential harm to the tester and the equipment during the pendulum impact testing process, a safety pin system with sector structure and safety self-locking function was researched. The structure of safety pin was designed by using SolidWorks. The software flow of control system of pendulum impact testing machine was established. The pendulum impact testing machine based on the protection of the safety pin system was designed. A large number of destructive impact tests of between pendulum and safety pin and system stability tests of impact testing machine were conducted in the presented machine. The results indicate that the safety pin system based on sector structure and safety self-locking function can not only effectively prevent from the accidental release of the pendulum but also withstand the repeated impact of the pendulum，which can provide a reference for the development and construction of pendulum impact testing machine with a higher level of safety protection performance.
Key words: pendulum; impact tester; safety pin