It refers to a cam door composed of rail, pulley, bearing, steel wire, polymer, linkage foot arm, electric drive rotating arm, and the drive arm has an adapter arm. These bearings are connected with steel wire on each side of the leaf, and the steel wire is connected to the pollen, so that the leaf is up and down without intruding into the outside area of the installation; during the opening and closing of the leaf, the rotating arm and the sliding arm work in parallel; the rail structure is a channel. When the leaf is driven by the tractor, the vertical sliding direction
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