| 摘要 |
A cable system for raising and lowering a door of an industrial furnace utilizes a pair of vertically extending cables having lower ends connected to the door and upper ends connected to shaft-carried sheaves that are rotated concurrently to cause upper portions of the cables to be wound onto and off of the sheaves to raise and lower the furnace door to open and close a furnace opening defined in a vertical furnace face. The cables wind onto and off of sheave-defined tracks that are configured to cause lower portions of the cables to move the door a small distance horizontally during raising and lowering. This small distance horizontal movement capability may be utilized at the initiation of door raising to move the door away from the furnace face, and at the conclusion of door lowering to close the door against the furnace face to close the furnace opening. Where a pair of cable supported doors cooperate to close left and right ends of a furnace opening, the horizontal movement capability may be utilized to move adjacent ends of the doors away from each other as the doors are raised, and to move the adjacent door ends toward each other as the doors are lowered to bring the adjacent door ends together so they can cooperate to close the furnace opening.
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