The trigger wheel rotates with engine RPMs and causes the speed sensor, or pickup oil, to produce triggering voltage pulses that correspond to engine speed and piston position. 触发叶轮随发动机转速而旋转，使得转速传感器或拾波线圈产生与发动机转速和活塞位置相对应的触发电压脉冲。
Through changing rotating speed, the germination rate of forage grass seeds that were treated in the hard seed treatment hit-machine could be increased significantly. 通过改变碰撞机叶轮转速，可以获得具有合适擦伤度的牧草种子，满足提高种子渗透性和发芽率的要求。
