Flatbed truck with a foldable caster unit

A flatbed truck with a foldable caster unit, comprising a load-bearing plate, a load-bearing support frame and a caster unit, the load-bearing support frame being arranged at a bottom of the load-bearing plate, and the caster unit being mounted on the load-bearing support frame and is rotatable around a pivot axis of a corresponding wheel unit between a folded storage position and an unfolded rolling position, the caster unit comprising a front caster unit and a rear caster unit, wherein

• the flatbed truck with the foldable caster unit further comprises a caster unit rotation driving device, and the caster unit rotation driving device comprises an operating handle, a connecting rod, a front linkage mechanism and a rear linkage mechanism, wherein the operating handle is pivotally connected with the load-bearing plate and is rotatable around a pivot axis of the operating handle, the connecting rod is linked with the operating handle, and the front linkage mechanism is linked with the connecting rod and the front caster unit, the rear linkage mechanism is linked with the connecting rod and the rear caster unit, the operating handle is capable of linking with the front linkage mechanism and the rear linkage mechanism via the connecting rod to respectively drive the front caster unit and the rear caster unit to be rotated from the folded storage position to the unfolded rolling position, when the operating handle is rotated from a first position to a second position;
• the front caster unit and rear caster unit are both provided with a reset device, the front caster unit and the rear caster unit are capable of being rotated from the unfolded rolling position to the folded storage position under an action of the reset device, when the operating handle is rotated from the second position to the first position,
• wherein the front linkage mechanism comprises a front driving pipe, a front supporting arm and a front fixing base, and the front driving pipe is rotatably connected with the connecting rod, one end of the front supporting arm is connected and fixed with the front driving pipe, another end of the front supporting arm is pivotally connected with the front fixing base, the front fixing base is connected and fixed with the load-bearing plate, and the front driving pipe is arranged such that the end of the front driving pipe is capable of abutting against an inner surface of the front caster unit so as to drive the front caster unit to rotate and unfold to the unfolded rolling position during an rotation of the operating handle from the first position to the second position.