▎ 摘　　要

NOVELTY - The tent has a first cavity opened at the bottom of the inside of the insertion cylinder. A second cavity is reserved at the top of the interior of the insertion cylinder. The second cavity and the first cavity are connected with each other. A crankshaft is penetrated through the top of the inner side of the second cavity. The crankshaft is penetrated to the mounting block. A sealing partition is fixed at the middle position of the bottom of the second cavity. A first piston is arranged inside the first cavity. An elastic rubber bin is pasted between the first piston and the insertion cylinder. A movable plate is installed at the middle position of the first piston near one side of the elastic rubber bin. The movable plate is penetrated to the first cavity. A conduit is connected between the elastic rubber bin and the first cavity. A valve is installed on the outside of the conduit. USE - Waterproof and flame-retardant canvas tent. ADVANTAGE - The waterproof and flame-retardant canvas tent is coated with PU coating through the outer wall of the cloth main case, hence the waterproof ability of the device is increased. The graphene composite fiber layer is pasted inside the cloth main case, so that the flame retardant ability of the device is greatly improved, and the overall waterproof and flame retardant capability of the device is greatly increased, and the stability during use is increased. DESCRIPTION OF DRAWING(S) - The drawing shows a front sectional view of the waterproof and flame-retardant canvas tent. Top plate (1) Support rod (2) Fabric main case (5)