| 摘要 |
PURPOSE: A duplex limit device of switch is provided to surely cover or open a heat-retaining cover of tunnel-type green house using one switch device while reducing the number of switching device. CONSTITUTION: A duplex limit device of switching device comprises: a dove installed in one side of a switch(10) for the green house to move to left and right along a rotating transfer screw by decelerating a torque of the switch; a positioning limit switch(SW1)(SW2) deciding one high-low limit location of a switch; a limit switch for changing direction(SW3)(SW4) changing a rotation direction of the switch while moving to outside of the positioning limit switch along the transfer screw; the transfer screw moving the limit switch(SW1)(SW2)(SW3)(SW4); a drive relay switch(R1); a direction-changing relay switch(R2); and a magnetic-maintaining relay switch(R3).
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