Abstract: The present disclosure discloses a height quickly-adjustable jack, including a telescopic component and a load-bearing component. The telescopic component is provided with a limiting plate, an outer pipe and an inner pipe. The inner pipe is located inside the outer pipe, and the inner pipe is movably connected with the outer pipe along a center line of the outer pipe. The outer pipe has a hexagonal pipe structure. The limiting plate is fixedly mounted outside the outer pipe and is only connected with one of side surfaces. An extension direction of the limiting plate on the outer pipe is parallel to the center line of the outer pipe. The limiting plate is provided with limiting holes. The load-bearing component is movably mounted on the outer pipe.

Abstract: Disclosed is a top-driven jack, including an outer pipe, an inner pipe, a lead screw, a nut, a fixed part, and a handle; the inner pipe extends into the outer pipe; the nut is fixedly mounted on the inner pipe; the lead screw is movably mounted in the outer pipe through the fixed part and extends into the inner pipe, and is engaged with the nut; the fixed part includes a fixed seat and a movable sleeve; a connecting hole and an accommodating hole are formed in the movable sleeve; a connecting section is arranged at one end of the lead screw; the movable sleeve is movably connected with the fixed seat and embedded into the connecting hole through the connecting section and synchronously moves with the lead screw in the circumferential direction around the central line of the lead screw.

Abstract: The present disclosure discloses a height quickly-adjustable jack, including a telescopic component and a load-bearing component. The telescopic component is provided with a limiting plate, an outer pipe and an inner pipe. The inner pipe is located inside the outer pipe, and the inner pipe is movably connected with the outer pipe along a center line of the outer pipe. The outer pipe has a hexagonal pipe structure. The limiting plate is fixedly mounted outside the outer pipe and is only connected with one of side surfaces. An extension direction of the limiting plate on the outer pipe is parallel to the center line of the outer pipe. The limiting plate is provided with limiting holes. The load-bearing component is movably mounted on the outer pipe.

Abstract: Disclosed is a top-driven jack, including an outer pipe, an inner pipe, a lead screw, a nut, a fixed part, and a handle; the inner pipe extends into the outer pipe; the nut is fixedly mounted on the inner pipe; the lead screw is movably mounted in the outer pipe through the fixed part and extends into the inner pipe, and is engaged with the nut; the fixed part includes a fixed seat and a movable sleeve; a connecting hole and an accommodating hole are formed in the movable sleeve; a connecting section is arranged at one end of the lead screw; the movable sleeve is movably connected with the fixed seat and embedded into the connecting hole through the connecting section and synchronously moves with the lead screw in the circumferential direction around the central line of the lead screw.