Abstract: The invention discloses an extension structure with expandable space, comprising: a vehicle body, a lower end face of the vehicle body is provided with a plurality of hydraulic support legs; four horizontal rods, the lower side of each opening is provided with two horizontal rods; the four horizontal rods are of telescopic structures, and are folded on two sides of the vehicle body; two top plates, two bottom plates, two extension side walls, each extension side wall comprising: a first side wall plate, a second side wall plate and a third side wall plate, wherein two side edges of the first side wall plate are hinged to one side edge of the second side wall plate and one side edge of the third side wall plate, respectively, and the other side edge of the second side wall plate and the other side edge of the third side wall plate are hinged to two sides of the openings, respectively.

Abstract: The invention discloses a folding and unfolding mechanism. The folding and unfolding mechanism is mounted between an upper panel and a lower panel which are hinged, and is used for folding and unfolding the upper panel and the lower panel, and for overturning for 0-180 degrees between the upper panel and the lower panel; wherein the folding and unfolding mechanism comprises a four-connecting-rod assembly, a pushrod assembly and an auxiliary connecting rod assembly; the auxiliary connecting rod assembly comprises a first auxiliary connecting rod and a second auxiliary connecting rod, wherein one end of the first auxiliary connecting rod is hinged to one end of the second auxiliary connecting rod; the other end of the first auxiliary connecting rod is hinged to the lower panel; and the other end of the second auxiliary connecting rod is fixedly connected with a fourth connecting rod.

Abstract: The invention discloses a folding and unfolding mechanism. The folding and unfolding mechanism is mounted between an upper panel and a lower panel which are hinged, and is used for folding and unfolding the upper panel and the lower panel, and for overturning for 0-180 degrees between the upper panel and the lower panel; wherein the folding and unfolding mechanism comprises a four-connecting-rod assembly, a pushrod assembly and an auxiliary connecting rod assembly; the auxiliary connecting rod assembly comprises a first auxiliary connecting rod and a second auxiliary connecting rod, wherein one end of the first auxiliary connecting rod is hinged to one end of the second auxiliary connecting rod; the other end of the first auxiliary connecting rod is hinged to the lower panel; and the other end of the second auxiliary connecting rod is fixedly connected with a fourth connecting rod.

Abstract: The invention discloses an extension structure with expandable space, comprising: a vehicle body, a lower end face of the vehicle body is provided with a plurality of hydraulic support legs; four horizontal rods, the lower side of each opening is provided with two horizontal rods; the four horizontal rods are of telescopic structures, and are folded on two sides of the vehicle body; two top plates, two bottom plates, two extension side walls, each extension side wall comprising: a first side wall plate, a second side wall plate and a third side wall plate, wherein two side edges of the first side wall plate are hinged to one side edge of the second side wall plate and one side edge of the third side wall plate, respectively, and the other side edge of the second side wall plate and the other side edge of the third side wall plate are hinged to two sides of the openings, respectively.