Automatic weighing plant for dyes in powder form

Details Automatic weighing plant for dyes in powder form Automatic weighing plant for dyes in powder form

1993-10-07

1995-09-19

Kashnikow, Andres

Dispensing

Agitator followed by discharge assistant and/or...

All rotary

222342, 222413, G01F 1300

Patent

active

054509866

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention concerns the realization of an improvement in the extraction groups for dyes in powder form in automatic weighing plants.


SUMMARY OF THE INVENTION

It is known that the preparation of dye works mixtures for obtaining a specific color starting from the basic colors can be realized by means of dosing and weighing plants operating in automatic mode.
For example, an automatic dosing and weighing plant for the preparation of dye works mixtures is known, which is the object of the Italian patent n. 1210567, by the same inventor. It consists of a plurality of hoppers containing the dyes, placed side by side, each being provided with a dye extraction group. Each extraction group consists of an extraction screw placed inside the hopper, in front of which there is a discharge door provided with a perforated surface through which the dye in powder form comes out after being conveyed by the screw rotation. The dye which flows out of the discharge door is collected in a container placed on a scale which automatically stops the screw when the preselected weight is reached and then places the container under another extraction group which is a part of a container with a different dye.
A limit presented by this kind of dosing plants is the low weighing precision, which in general cannot be better than .+-.1/10 gram, even if the extraction of the dye from the discharge door is obtained by running the extraction screw at a low speed.
This low precision is due to the fact that when the dye comes out of the perforated surface of the discharge door, it is not in powdery form, but is clotted in grains of different sizes, thus allowing neither a homogeneous dosing nor a high weighing precision. Moreover, the realization of a low extraction speed in order to obtain enough precise weighings, namely within the tolerance value of plus or minus one tenth of gram, is expensive when large amounts of dye are to be weighed, because that causes an increase in the preparation time.
The purpose of the present invention is to overcome the above mentioned disadvantages by realizing an improvement in the extraction groups for dyes in powder form in automatic weighing plants, the main purpose of which being a significantly higher weighing accuracy.
Another purpose of the invention is to obtain a high weighing precision even with high extraction speeds and thus with high screw rotation speeds.
The above mentioned purposes are reached by the realization of an improvement in the extraction groups for dyes in powder form in automatic weighing plants, each extraction group comprising: externally wrapping a hollow shaft projecting from one side of the hopper and provided, at the protruding end, with a clutch for the connection to a screw rotation unit; the dye holding hopper, provided with a perforated surface through which the dye in powder form comes out, after being conveyed by the rotation of the screw; surface of the door and connected with the end of a rod placed inside and passing through the hollow shaft of the screw from which the rod protrudes, coaxial, in correspondence of the clutch of the hollow shaft itself, element which adheres to the perforated surface of the discharge door and which is placed between the discharge door and the lid, said scraping element realizing the fine pulverization of the dye coming out of the door by sliding against the perforated surface of the door itself, said sliding being caused by the relative motion between said scraping element and said perforated surface of said discharge door.
Advantageously, the scraping element of the invention allows a high extraction speed, with a significantly higher weighing precision than that obtainable with similar plants without the scraping element of the invention.
Advantageously, the scraping element of the invention permits, with only one screw having a high capacity, the dosing of large amounts of dye in a short time, realizing weighings with a significantly higher tolerance than that obtainable with similar plants without th

REFERENCES:
patent: 465526 (1891-12-01), Heyer
patent: 1790347 (1931-01-01), Hawkins
patent: 1931088 (1933-10-01), Schwarz et al.
patent: 2753089 (1956-07-01), Phillips
patent: 3033249 (1962-05-01), Tamm
patent: 3058628 (1962-10-01), Smith
patent: 3373901 (1968-03-01), Pfeuffer
patent: 4793511 (1988-12-01), Ankum et al.
patent: 5007564 (1991-04-01), Beth et al.

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