he model of the Tower crane are QTZ50/5008/, QTZ50/5010/,QTZ50/5010/, The main parameter of each model are showed in follow:

(1), Tower crane QTZ50/5008/:Its max lifting load is 4t,  Its max lifting height is 30/120m,Its Max working range is 50m,  the Lifting speed is 72/36m/min,  the Slewing speed is 0/0.6r/min,   the Demicking speed is 39/26m/min,and the power is 380v/50HZ;

(2). Tower crane QTZ50/5010/:Its max lifting load is 4t,  Its max lifting height is 30/120m,Its Max working range is 50m,  the Lifting speed is 72/36m/min,  the Slewing speed is 0/0.6r/min,   the Demicking speed is 39/26m/min,and the power is 380v/50HZ;

(3). Tower crane QTZ50/5010/:Its max lifting load is 5t,  Its max lifting height is 30/120m,Its Max working range is 50m,  the Lifting speed is 70/35m/min,  the Slewing speed is 0/0.6r/min,   the Demicking speed is 39/26m/min,and the power is 380v/50HZ;