Adjust the synchronous speed of the motor to 150, 500, 750, 1250, 1470, 1750 and 2000 R / min respectively under the rated load (1470 occurs instead of 1500 because the cutting motor speed under the rated condition is 1470), and take the load fluctuation coefficient as 0.2.
① Dynamic meshing force of gears
Figure 1 shows the change of dynamic load coefficient of each fixedpair with cutting motor speed under different fixed speed in the range of 150 ~ 2000 R / min. After coupling the rocker box, the dynamic load coefficient of the same gear pair may increase or decrease, depending on the working speed of the system (such as gear pair 1); at the same speed, the dynamic load coefficient of different gears may increase or decrease, depending on the position of the gear pair in the rocker box (such as gear pair 3 and gear pair 7 at 1750 R / min). On the whole, the dynamic load coefficient of each gear pair before and after the coupling rocker box is not obvious.
② Reaction force of bearing support
Figure 2 shows the variation of the peak value of each bearing reaction force with the cutting motor speed under different fixed speeds in the range of 150 ~ 2000 R / min. After coupling the rocker arm box, the peak value of the bearing reaction at the motor (fixed) end changes little, while the peak value of the bearing reaction at the drum (free) end changes greatly. This is due to the large vibration displacement of the free end of the rocker box, and the large inertial force generated by the internal transmission system when it is involved in the movement.