The present invention relates to a classroom sliding door, and the rail surface of the general lower frame plate where the rail protrudes from the lower frame of the classroom sliding door of the aluminum chassis is covered with a stainless steel plate cover to reinforce the upper rail, but the lower frame plate at the bottom of the rail The upper surface of the "c" type groove line is provided on both sides of the lower rail, and the bottom of the stainless steel plate cover is formed by bending the "b" type edge piece outwardly on both sides of the stainless steel plate cover. The bottom surface of the lower part of the frame is formed to have a stepped surface, and the fixing piece of the threshold height plate is fixed to the end surface of the lower section plate by screwing a fixed distance with a screw to fix the height of the upper surface of the rail and the height of the upper surface of the threshold plate. It is effective to provide a simple structure by configuring similarly formed.;Classroom Sliding Door, Rail, Sill Height
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