| 摘要 |
The present invention relates to an explosion-proof air driven shutter that is simply configured to conduct the opening and closing operation of a sheet by means of two air cylinders, without having any electronic motor. According to the present invention, the sheet shutter (1) conducting the opening and closing of a sheet (2) with compressed air as a power source includes: a sheet case (4) supporting a sheet drum (5) adapted to wind or unwind the sheet (2) in such a manner as to be forwardly or backwardly rotated; and shutter guides (12) disposed on the sides of the sheet case (4) to reciprocate the sheet (2), wherein a forward rotation cylinder (11a) and a backward rotation cylinder (11b) are driven by the compressed air, and piston rods (34) of the cylinders are extended or contracted to and from the sheet drum (5) by means of the shutter guides (12). Further, the sheet drum (5) is connected to a forward rotation connection member (31) and a backward rotation connection member (32) attached to the piston rods (34), respectively, so that the sheet drum (5) can be rotated forwardly and backwardly by means of the extension and contraction of the piston rods (34), thus conducting the winding and unwinding operations of the sheet (2). |
