Double-lifting device for towing type traveling vehicle

A double-lifting device for a towing type traveling vehicle, comprising:

• an active leg (1), a driven leg (2), a transmission member (3), a geared motor (4), a gear reduction structure (5), a first reverse gear reduction structure (6), and a second reverse gear reduction structure (7);
• the geared motor (4), the gear reduction structure (5), and the first reverse gear reduction structure (6) are sequentially and drivably connected;
• the output end of the gear reduction structure (5) is also used to drive the transmission member (3), and the transmission member (3) is used to drive the second reverse gear reduction structure (7);
• a leg structure involved in the active leg (1) and the driven leg (2) includes a fitting tube (8), lifting tube (9), a grounding member (10), and a screw pair (11);
• the fitting tube (8) is used to fit the geared motor (4), the gear reduction structure (5) and the first reverse gear reduction structure (6);
• a screw (12) of the screw pair (11) is connected to an output end of the first reverse gear reduction structure (6) to realize a rotation of the screw (12) itself, a nut (13) of the screw pair (12) is used for connecting the lifting tube (9) to perform lifting movement of the lifting tube (9) relative to the fitting tube (8);
• the grounding member (10) is detachably connected to the lifting tube (9) for ground support;
• and
• the geared motor (4) has an overrunning clutch for gear transmission overload protection.