Conveyors: fluid current – Having means for maintaining load in suspension along flow path – Including permeable member
Patent
1990-04-01
1992-11-17
Focarino, Margaret A.
Conveyors: fluid current
Having means for maintaining load in suspension along flow path
Including permeable member
406 86, 406196, B65G 5354, B65G 5316, B65G 5318
Patent
active
051637871
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an apparatus for the transportation of a particle material. Different more or less powdery materials, which are often stored in silos, are primarily concerned. For example, when the material is discharged from a silo, it is often necessary to transport it also horizontally, to the back of a lorry etc.
So far conveying screws have been mainly used for such transportation of a material. The disadvantages of conveying screws are the difficulty of cleaning in changing the material to be transported and their stiffness as well as the liability to wear and the frequent need of maintenance due to the wear.
The object of the invention is to provide a new and better apparatus for transporting a mass-like particle material.
The apparatus according to the invention is mainly characterized in that it comprises a flexible hose, on the inside of which members have been arranged for fluidizing the material to be transported, and that said members have been formed along the hose as elements functioning independently of one another.
The flexible hose is preferably made of rubber, plastic or a corresponding material, in which case the hose can be supplied as a bulk article, and the user can cut therefrom a length needed in a particular case.
By virtue of the flexible hose and the fluidization members arranged therein, the material can be transported in a controlled manner along a curvy line even in narrow passages irrespective of the prevailing conditions and without dust formation or loss of material. On account of the flexibility of the hose, the solution is economical when process changes occur because changes in the transportation routes of the material and the passing, or circling, of other devices can be easily effected as the hose does not need any solid foundations or the like. The hose functions also well no matter what position the cross-section is turned to. If the hose is even slightly descending in the transportation direction, the force of gravity is sufficient to transport the fluidized material. Several hoses can well be arranged in succession, whereby the apparatus can be used to transport the material even long distances.
Owing to the fact that the fluidization members are formed as elements functioning independently of one another in the longitudinal direction of the hose, the transportation of the material along the hose can take place without interruption even if temporary interruptions should take place in the supply of the material.
The members for fluidizing the material to be transported comprise preferably a gas-permeable lining at least partly covering the inner surface of the hose, whereby the spaces between the hose and lining are formed into separate sections in the longitudinal direction of the hose, and throttled feed of gas is arranged for each section, whereby longitudinal channels or tubes which open into said separate sections through throttle apertures are formed in the wall or on the surface of the hose for feeding gas to the separate sections.
Suitable dimensioning of the throttle apertures between the longitudinal channels in the wall of the hose and the sections within the hose helps to achieve the fact that the compressed air in the channel cannot escape from the side of the hose which is not covered with the material to be transported.
Alternatively, the members for fluidizing the material to be transported can preferably comprise a gas feeding tube disposed on the bottom of the hose and provided with throttle apertures, said tube being surrounded by a gas-permeable cloth or the like attached at least substantially tightly to the tube at regular intervals.
In the following, the invention will be described by means of the embodiments disclosed in the attached drawings.
FIG. 1 shows a first embodiment of the invention seen substantially from the side.
FIGS. 2 and 3 show a cross-section and a longitudinal section respectively of the hose according to FIG. 1.
FIGS. 4 and 5 show a longitudinal section and a cross-section respectively of the hose according to a
REFERENCES:
patent: 2882097 (1959-04-01), Hamren
patent: 3253865 (1966-05-01), Kanics
patent: 4220425 (1980-09-01), Jacobsen
patent: 4220426 (1980-09-01), Ply
patent: 4575284 (1986-03-01), Kelm
Derwent's Abst. N8171E/42 (Krama).
Abst. of Japan vol. 7 No. 250 (M-254) (Denka).
Aalto Pentti
Bjorklund Jan-Peter
Fellman Jacob
Focarino Margaret A.
Kannofsky James M.
Oy Partek Ab
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