Drying and gas or vapor contact with solids – Apparatus – Rotary drums or receptacles
Patent
1986-02-24
1987-04-14
Schwartz, Larry I.
Drying and gas or vapor contact with solids
Apparatus
Rotary drums or receptacles
34135, 34138, F26B 1104
Patent
active
046567593
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an aeration-type rotary dryer that is capable of quick and efficient treatment irrespective of the properties of materials to be dried.
BACKGROUND ART
The known aeration-type rotary dryer, such as a Roto-Louvre dryer, is highly efficient if materials are not sticky. However, it is expensive as compared with the ordinary or non-aeration rotary dryer, because of having a complicated double-wall cylinder and sealing means for sliding portions between the hot-air inlet and the air chambers. Besides, it is not suitable for sticky materials because of being incapable of preventing formation of lumps.
On the other hand, the non-aeration rotary dryer is simple in construction and available for drying sticky materials, but incapable of quick and efficient treatment.
The present invention is intended to resolve the problem as described above and provide an aeration-type rotary dryer that is relatively simple in construction and capable of quick and efficient treatment irrespective of the properties of materials.
DISCLOSURE OF THE INVENTION
The present invention consists in a rotary dryer having inlet and outlet boxes, a single-wall rotating cylinder rotatably, air-sealingly supported by the inlet and outlet boxes, an axial duct having an end connected to a hot-air source and axially extending within the cylinder, a plurality of radial ducts branched slantingly, downwardly from the axial duct, each radial duct having a free end positioned in the vicinity of the inner surface of the cylinder and provided with a nozzle. The cylinder is provided with two riding rings and a girth gear driven by a drive assembly. Each riding ring is rotatably supported by a trunnion assembly.
The inlet box is equipped with a feeder through which materials are put into the cylinder. The outlet box has a discharge port from which the finished product is discharged. An air-exhaust port is attached to either or both of the inlet and outlet boxes.
The materials are fed into inlet-side end of the cylinder by the feeder to progress through the cylinder by virtue of rotation and slope of the cylinder to the outlet box. Meantime, the materials accumulate in the underside of the cylinder to form an inclined surface into which the radial ducts plunge. Hot air is supplied through the axial duct to each radial duct to blow from the nozzle into the materials. Thus, a sufficient heat-transfer is made between the materials and the hot air. The materials can not be discharged without being subjected to the hot air blowing from all the radial ducts which are axially alined from the inlet-side end of the cylinder to the outlet-side end, thereby the materials being efficiently treated within a relatively short time.
The cylinder is preferably provided with a plurality of radial pins which are disposed on the inner surface of the cylinder along a circle between the two adjacent radial ducts to prevent the materials from forming lumps. A lump of materials, when formed, is easily caught by two adjacent radial ducts and broken by the radial pin passing therebetween.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a front elevation of the dryer of the invention;
FIGS. 2 and 3 are longitudinal and cross sections of the rotating cylinder of FIG. 1;
FIGS. 4 to 7 are views similar to FIG. 2, of different embodiments;
FIG. 8 is a cross-section of the rotating cylinder of FIG. 7;
FIGS. 9 to 12 are views similar to FIG. 3, of different embodiments;
FIGS. 13 to 15 are views respectively similar to FIGS. 1 to 3, of another embodiment; and
FIGS. 16 to 18 are pictorial views illustrating the steps in which a lump of materials is broken by a radial pin.
BEST MODE OF CARRYING OUT THE INVENTION
The present invention is described in detail below with reference to drawings which illustrate preferred embodiments.
As seen in FIG. 1, the dryer has a rotating cylinder 10 rotatably, air-tightly supported by inlet and outlet boxes 11, 12. The rotating cylinder 10 is provided on its outer surface with a girth gear 13 and two riding
REFERENCES:
patent: 3874092 (1975-04-01), Huttlin
Schwartz Larry I.
Yamato Sanko Mfg. Co., Ltd.
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