Cleaning and liquid contact with solids – Processes – Hollow work – internal surface treatment
Patent
1992-02-18
1994-12-06
Andrews, Melvyn J.
Cleaning and liquid contact with solids
Processes
Hollow work, internal surface treatment
134 18, 134 2218, 134 24, 134 57R, 134 58R, 134153, B08B 302, B08B 900
Patent
active
053707460
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a cleaning process and an apparatus for cleaning of clogged holes or passages of a small diameter such as, for example, through holes of a constant diameter or through holes of varying sizes and, in particular, holes provided in dies having a large number of such holes-for through pressing of materials during the manufacturing of pellets, such as dies employed during pelletizing of feed stuff pellets.
Without limiting the invention to dies for pelletizing of feed pellets, in the following description, for the purpose of simplicity and only for exemplifying the invention is described mainly with reference to dies of the aforementioned type.
BACKGROUND OF THE INVENTION
Pelletizing dies of the aforementioned type may have an axial length of 0.15-0.25 m and a diameter of about 0.4-0.6 m and may be fashioned as cylindrical elements of steel having a material thickness of about 0.5-0.15 m provided in a radial direction with a large amount of drilled through holes or passages having a diameter of about 1.3-10 mm.
Generally the holes or passages are drilled, from the periphery of cylindrical elements by a precisely guided drilling machine, with the holes or passages being distributed so that the holes are mutually spaced, with the spacing between the holes or passages being about two to three times their diameters, whereby the holes or passages, having their axes radially oriented, are distributed along several an annular rings encircling the cylindrical periphery of the die elements, for example, a hundred holes may be contained within each of twenty-forty-five annular ring formations encircling the die elements. The dies are employed for pelletizing, most often in the manner, that two or three cylindrical rolls at a distance of about 0.5-1 mm are arranged rolling against an internal surface of the cylindrical dies. A material to be pelletized, for example, a feed stuff powder, is supplied to the spacing thus arranged between the rolls and the inner surface of the die while they roll against each other. By application in this manner of a great pressure on the feed stuff powder, the powder is pressed through the single die holes or passages and is shaped into thin bars, which, by suitable cutting means are cut into suitable lengths at the outside of the die. With a die of the aforementioned size, which, for example, comprises 10,000 holes, each having a diameter of about 3 mm, five to ten tons of feed stuff may pass through the die per hour.
Experience shows that, in the course of time, unavoidably more and more of the holes or passages become clogged resulting in a reduction in the production and resulting in unwanted down time in the production, whereby the production down time may cause further clogging of the holes or passages in the dies to take place. Much of the clogging of the holes or passages is caused by small pieces of metal which, in one way or another, are present in the feed stuff mixture. However, partially clogged peripheral portions of the dies may have been caused by utilizing erroneous feed stuff mixtures or through an undesirable wearing of counter-sunk input ends of the die holes, which counter sinking was provided during the manufacturing of the dies.
Clogging may also be the result of the deforming cf the feed stuff input ends of the holes by the pressing rolls because of application of a too large pressure by the pressing rolls when the pressing rolls during manufacture of the feed stuff pellets, are being pressed against the inner side of the dies, etc. Dies causing reduced production have to be exchanged with dies giving optimum production. As the dies are rather expensive, it is desirable to restore or repair the dies.
Up to the present time, this restoring of the dies has been accomplished by a simple drilling process taking place by means of manually guided drilling machines, since this manner of restoring the dies is more efficient than using a pillar drill because pillar drills leave more broken drills unremovable stuck in
REFERENCES:
patent: 3608567 (1971-09-01), Neill, Sr.
patent: 3799178 (1974-03-01), Anderson et al.
patent: 3840402 (1974-10-01), Tobin, III
patent: 4299245 (1981-11-01), Clapper
A single sheet of paper reciting "Example Applications" of remote pipeline cleaning/dehydrating (best available copy). Author: Orlanda Sivacoe Date: May, 1991 Place of Publication: Canada.
Pedersen Benny
Sihm Kurt
Andrews Melvyn J.
Chaudhry Saeed T.
O & J Hojtryk A/S
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