Bulk solids property tester
AssigneeJenike & Johanson, Inc.
InventorJerry R. Johanson
Life of this patent
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Abstract
Apparatus and method for testing the internal friction and yield strength properties of bulk solids, for use in the design of material handling equipment. A sample of the solids is confined under controlled pressure in a test cell having an annular wall converging from one end of larger cross section downwardly toward a second end of smaller cross section. The pressure at the one end is varied until the ratio of the two pressures becomes constant. The two resulting pressures are then used together with the separately measured bulk density of the solids and the angle of friction thereof with the wall of the test cell to compute the effective angle of internal friction. By a further step including removal of the pressure applying means at the other end the unconfined yield strength may be determined.
Claims15
Testing apparatus for bulk solids comprising, in combination,
- a test cell for containing the solids having a laterally enclosing wall converging from a first end toward a second end thereof, the cross sectional area of the first end exceeding the cross sectional area of the second end,
- means for applying pressure to the solids over said area of the first end including means to increase said pressure and a sensor for measuring said pressure, and
- means extending over said area of the second end, movable in the direction toward and away from the first end and adapted to confine the solids in the cell.
A method of testing the properties of bulk solids comprising the steps of
- confining a sample of said solids within a test cell having a laterally enclosing wall converging from one end toward the other whereby the cross sectional area of the sample is greater at said one end than at the other,
- applying an independently controlled and measured pressure to the sample at each said end,
- and increasing the pressure applied to said one end until the ratio thereof to the resulting pressure at the other end reaches a steady state value.
A method of testing the properties of bulk solids comprising the steps of
- confining a sample of said solids within a test cell having a laterally enclosing wall converging from one end toward the other whereby the cross sectional area of the sample is greater at said one said end than at the other,
- applying a measured pressure to said one end while confining the solids in the cell over the area of said second end,
- removing the applied pressure,
- removing the confinement of the solids over said last-mentioned area,
- reapplying and increasing a measured pressure to said one end until the solids fail at said other end, and
- detecting the value of the applied pressure when said failure occurs.
Dependencies are inferred from the claim text.