| 摘要 |
<p>@ The main door (12) of a freeze dryer is provided with a sub-opening (16) arranged to register with the space between adjacent vertically adjustable freeze dryer shelves (14), for infeeding and outfeeding trays or other containers of material to and from each shelf. An entry chamber (18) surrounds the sub-opening and has a sloping outer face provided with a resilient seal (20) arranged to form a pressure tight seal with a sub-door (26) movable by a fluid pressure piston-cylinder unit (36, 38) between positions opening and closing the entry passageway (18') of the entry chamber (18). Photoelectric safety mechanism (64) is associated with the entry passageway to prevent closing of the sub-door (26) when any object is in the entry passageway (18').</p> |
