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Compressing and grinding apparatus

  • US 4,807,816 A
  • Filed: 07/19/1988
  • Issued: 02/28/1989
  • Est. Priority Date: 12/23/1985
  • Status: Expired due to Fees
First Claim
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1. An apparatus for compressing and grinding a material such as crusts of seeds, rice, hulls, trunks, branches and leaves of plants and grasses, especially those containing a siliceous material, said apparatus comprising:

  • an outer cylinder having an inner surface which has a tapered frusto-conical shape in cross-section and a plurality of axially-extending grooves in said inner surface,a sleeve co-axially connected at one end thereof to a downstream side of said outer cylinder and having an inner cross-sectional shape varying continuously from polygonal to circular from said one end to the other, anda screw axially aligned with and extending through said cylinder and into said sleeve, and said cylinder and said screw defining a spacing having a decreasing cross-sectional area in which the material is compressed and ground at a pressure of from 1 to 100 tons/cm2 and heated to a temperature of from 150°

    to 600°

    C., said screw including feeding-compressing portion, an intermediate portion, and a compressing-grinding portion and having a body diameter and a screw thread diameter, said body diameter and said screw thread diameter each decreasing discontinuously in said intermediate portion, said intermediate portion being positioned within said outer cylinder, the pitch of each portion being uniform and the pitch of the compressing-grinding portion being smaller than the pitch of the feeding-compressing portion.

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