The utility model relates to a capacity expansion device, which comprises a bottom plate, a storage module, a mobile module and an
electric control module, the storage module comprises a left side plate, a middle side plate, a right side plate, a shelf, a bottom supporting plate, an outer rail connecting plate, a first drawer guide rail, a door plate, an inner rail connecting plate, a drag chain and a first sensor. The outer rail connecting plate and the bottom supporting plate are sequentially installed on the bottom plate, and the outer guide rail and the inner guide rail of the first drawer guide rail are installed on the outer rail connecting plate and the inner rail connecting plate respectively. The door plate, the left side plate, the middle side plate, the right side plate and the shelf are installed on the inner rail connecting plate, the storage module is divided into a plurality of storage bins, and the storage bins are provided with first sensors. The moving module comprises a clamping jaw moving mechanism, an X-axis translation mechanism, a Z-axis translation mechanism and a Y-axis translation mechanism; the clamping
jaw movement mechanism is mounted on the X-axis translation mechanism; and the X-axis translation mechanism, the Z-axis translation mechanism and the Y-axis translation mechanism are sequentially mounted on the bottom plate, so that the problem that the
glass slide of the
glass slide scanning equipment is inconvenient to replace is solved.