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Gravity shelves by pallet rack evolved, the drum track wheel or the bottom tray. Gravity shelves are derivatives of crossbeam type goods shelves, the shelf structure of crossbeam type goods shelves similar, just on the beam placement of drum type track, orbit is tilted 3-5 degrees. Gravity shelves by side of the roadway as stored, the side of the roadway as out, the drum line according to a certain angle inclined fixed on the shelf beams, tray placed from the high-end, along the drum line by its own gravity decline, for controlling a tray with a constant speed decline, to avoid the collision, in drum line every certain distance is provided with a damping system, tray fell faster, damping system to produce resistance more. End of the separation mechanism is set in the low-end, used to the low end of the separation of adjacent two tray, so that the bottom of the tray can successfully removed. Pallet forklift to shelf purchase export, the weight, tray from the imported automatic taxiing to the other end of the pick up the mouth, and truly realize the "advanced first in first out" principle. The depth of the rack and the number of layers according to customer needs and. Gravity shelves suitable for few varieties and large quantities of similar goods storage, high space utilization rate.

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