The model of the Tower crane are QTZ250/7030/.The main parameter of the model are showed in follow:

 Tower crane QTZ250/7030/:Its max lifting load is12t,  Its max lifting height Is 51.20/168.7m, Its Max working range is 70m,  the Lifting speed is 80/40m/min,  the Slewing speed is 0~0.7r/min,   the Derricking speed is 58/38//15m/min,and the power is 380v/50HZ;