Material or article handling – Chamber of a type utilized for a heating function and... – Discharging of chamber by driven device
Patent
1993-12-03
1995-09-05
Bucci, David A.
Material or article handling
Chamber of a type utilized for a heating function and...
Discharging of chamber by driven device
222412, 414310, B65G 6534, A01F 2520
Patent
active
054474043
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a silo discharge arrangement for discharging woodchips, cellulose pulps and similar material from silos, and more specifically, although not exclusively, to a rotary discharge arrangement which will not prevent the delivery of a heating medium to the material stored in the silo.
2. Description of Prior Art
The invention is primarily intended for use in connection with silos which are intended for the storage and preservation of woodchips, cellulose pulps and comparable materials, to enable such material to be discharged to a material treatment section, e.g. for the manufacture of paper pulp. In this regard, it is important that the material is discharged in specific quantities per unit of time and in a uniform flow from the chip column as a whole, such that the chips will be discharged from the silo essentially in the same order that they entered the silo. Such flow is often referred to as plug flow. Furthermore, it is desirable that a medium, such as steam or hot air, can be introduced into the silo in order to heat or warm the material stored therein prior to continued treatment of said material. In this regard, the so-called plug flow is considered extremely important in achieving uniform and even heating of the material prior to its discharge from the silo, so that some parts of the material will not have a longer silo residence time than other parts and therewith be heated to a greater extent than said other parts, and so that other parts of the material will not have a shorter residence time in the silo and therewith be poorly heated. Even though the material stored in the silo has a relatively uniform lump or piece size, the variations in size of the individual lumps or pieces of material is still sufficient for discharge of the different sizes to take place in different degrees.
Many attempts to solve the aforesaid problem have been made. For instance, an example of the earlier state of the art is found in Swedish published specification No. 324 996, which teaches a rotatable disc having an outwardly turned, arcuate blade placed in the bottom of the silo. The intention of the arcuate blades is to scrape chips from the column of chips upstanding in the silo and to move the chip column out over the peripheral edge of the disc, so that the chip column will fall down into a receiver for further transportation to a receiving station. It has been found, however, that a discharge device of this kind does not effectively receive chips over the whole of its surface and that the majority of chips received arrive from the outermost parts of the chip column, whereas the centre of the column remains practically stationary. This is unimportant, however, from the aspect of heating the chips prior to their discharge, and consequently no problems are encountered with respect to uniform heating of the chips. On the other hand, problems relating to the mixed sizes of the chips are encountered.
Another attempt to solve the aforesaid problem is disclosed in Swedish Patent Specification No. 180 289. In this case, the rotatable disc provided at the bottom of the silo is comprised of two generally semi-circular discs which are constructed to form a helical cutting device having a generally diametrically cutting edge. This arrangement is based on the concept that as the disc rotates, there is cut from the chip column a layer which, in principle, has the form of two helices. Since chips have a tendency to stack, the effect obtained is not satisfactory and the discharge of chips does not come up to expectations. In order words, the cutting effect expected is not achieved due to the properties of the chips.
Both of the aforesaid discharge devices have the draw-back that the chips are able to accompany the disc as it rotates without being discharged by the disc.
SUMMARY OF THE INVENTION
The object of the present invention is to eliminate the aforesaid problems. This object is achieved with a discharge arrangement of the kind defined in t
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Bucci David A.
Celltec Engineering AB
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