High density pneumatic transport system for use in powdered or g

Details High density pneumatic transport system for use in powdered or g High density pneumatic transport system for use in powdered or g

1989-12-01

1992-10-13

Peters, Jr., Joseph F.

Conveyors: fluid current

Conduit

406 84, 406195, B65G 5118, B65G 5352

Patent

active

051545454

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

I. Field of the Invention
The present invention relates to a system for pneumatically transporting powdered or granular materials, more particularly to an improved system for pneumatically transporting powdered or granular materials stored in an airtight storage container to a collector through a transport pipe in high density and at low speed by supplying pressurized gas.
II. Prior Art
FIG. 10 shows a conventional pneumatic transport system for use in powdered or granular materials. The system is constructed such that powdered or granular materials stored in an airtight storage container 100 are fed from the container 100 to a lower pipe 102a of a transport pipe 102 by the gas supplied from a gas feed pipe 101, then the materials are formed into a a plug 105 by supplying pressurized gas intermittently from a pressure nozzle 103 disposed intermediate of the lower pipe 102a, and then pneumatically transported in an upper pipe 102c of the transport pipe 102 through an inclined pipe 102b, and finally received in a collector 104.
However, when powdered or granular materials are pneumatically transported in the form of a plug as described above, the clearance 106 between the surface of the plug 105 and the inner surface of transport pipe 102 is often generated as shown in FIG. 11. As a result, only powdered or granular materials A on the surface of the plug 105 are transferred at first and the shape of the plug 105 is broken, thus the transportation cannot be done satisfactorily. Furthermore, since the conventional transport system delivers the plug 105 at extremely high speed like several meters per second for example, the materials are subject to strong impact when being caught in the collector 104, and the collision of materials frequently occurs. Accordingly, there is a problem of high possibility of defective products having chipping or breakage when fragile materials such as medical tablets are pneumatically transported.
A method and the related system for pneumatically transporting powdered or granular materials without giving an impact thereon and at extremely low speed was disclosed in Japanese Patent Application No. 61-251173(1986) to solve above mentioned problems.
FIG. 5 shows a basic structure of the transport system according to the above mentioned application, wherein a transport pipe 5 being disposed between an airtight storage container 3 and a collector 6 comprises a lower horizontal pipe 5a having a convergent cylindrical accelerating reducer 71 connected to the airtight storage container 3, an upper horizontal pipe 5c being connected to the collector 6 and having a divergent cylindrical decelerating reducer 74 at its initial end, and a riser pipe 5b which connects the pipes 5a and 5c and has a pair of reducers consisted of an upper convergent cylindrical accelerating reducer 73 and a lower divergent cylindrical decelerating reducer 72 intermediately thereof.
According to such a pneumatic transport system, tablets delivered from a tablet molding machine 2 to a vibration feeder 1 fall into the container 3 passing through a hopper 31 and an opened valve 32. The tablets are transported from the container 3 to the lower horizontal pipe 5a by the use of pressurized gas supplied from a gas feed pipe 4, and immediately thereafter continuously transferred upwardly into the vertical riser pipe 5b being charged into a high density to a degree just before blocking the lower pipe 5a by the accelerating reducer 71. While transferring upwardly, the tablets are once decelerated by the reducer 72 being disposed midway of the vertical pipe 5b, and again accelerated by the reducer 73 while keeping the materials being charged at high density to obtain sufficient pushing force, subsequently transferred upwardly into the upper pipe 5c.
Immediately after the tablets are moved up to the upper horizontal pipe 5c and shifted the direction into a horizontal direction, they are once more decelerated by the reducer 74 being provided at the initial end of the upper pipe 5c. As a result, the t

REFERENCES:
patent: 2477414 (1949-07-01), McBride
patent: 3503650 (1970-03-01), Balmes
patent: 4904127 (1990-02-01), Morimoto et al.
patent: 4904128 (1990-02-01), Morimoto et al.

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