Height quickly-adjustable jack

A height quickly-adjustable jack, comprising a telescopic component (1) and a load-bearing component (7), the telescopic component (1) being provided with an outer pipe (2) and an inner pipe (3), the inner pipe (3) being located inside the outer pipe (2), and the inner pipe (3) being movably connected with the outer pipe (2) along a center line of the outer pipe (2), wherein the outer pipe (2) has a hexagonal pipe structure;

• an outer surface of the outer pipe (2) is provided with six side surfaces;
• the telescopic component (1) is also provided with a limiting plate (4);
• the limiting plate (4) is fixedly mounted outside the outer pipe (2) and is only connected with one of the side surfaces;
• an extension direction of the limiting plate (4) on the outer pipe (2) is parallel to the center line of the outer pipe (2);
• the limiting plate (4) is provided with limiting holes (6);
• an arrangement direction of the limiting holes (6) is parallel to the center line of the outer pipe (2);
• the load-bearing component (7) is movably mounted on the outer pipe (2);
• the load-bearing component (7) is provided with a pipe sleeve (8), a load-bearing seat (12) and a clamping component;
• a through-type accommodating hole (13) is formed inside the pipe sleeve (8);
• the accommodating hole (13) comprises a hole I (14) for accommodating the outer pipe (2) and a hole II (15) for accommodating the limiting plate (4);
• the hole I (14) is in communication with the hole II (15);
• a center line of the hole I (14) coincides with the center line of the outer pipe (2);
• an outer contour shape of the cross section of the outer pipe (2) and a contour shape of the cross section of the hole I (14) are both regular hexagons;
• an outer contour shape of the cross section of the limiting plate (4) and a contour shape of the cross section of the hole II (15) are both rectangles;
• a contour shape of the cross section of the accommodating hole (13) is the same as a contour shape of the cross section of the outer pipe (2) at a position provided with the limiting plate (4);
• the clamping component comprises a limiting column (16), a spring (17) and a handle (18);
• the cross section of the limiting column (16) is convex;
• the spring (17) is sleeved over the limiting column (16);
• the pipe sleeve (8) is provided with a mounting hole (9);
• the cross section of the mounting hole (9) is convex;
• the limiting column (16) is mounted in the mounting hole (9) in a sliding manner;
• the spring (17) is located between the limiting column (16) and the pipe sleeve (8);
• one end of the limiting column (16) is located outside the pipe sleeve (8) and is fixedly connected with the handle (18), and the other end of the limiting column (16) extends into the hole II (15);
• the load-bearing seat (12) is fixedly mounted on the pipe sleeve (8);
• and the pipe sleeve (8) is embedded in the accommodating hole (13) through the outer pipe (2) and the limiting plate (4), and the limiting column (16) is embedded in the limiting hole (6) and movably mounted on the telescopic component (1).