Dynamic scale utilizing shear measurements to determine a weight of bulk material
First Claim
1. A dynamic scale for bulk material comprising:
- two swivel arms;
a sensor disposed with each swivel arm of the two swivel arms to measure a shear stress in each swivel arm of the two swivel arms, the sensor comprising;
a hole being oriented generally transverse to a neutral fiber of a bending strain of a swivel arm of the two swivel arms;
at least one sensing element disposed in the hole and oriented generally transverse to a longitudinal axis of the hole, the at least one sensing element being able to measure changes in a diameter of the hole resulting from shear stress; and
wherein the at least one sensing element is inserted and at angle of approximately ±
45°
to a direction of a shear stress τ
xy of the swivel arm of the two swivel arms; and
an acceleration sensor disposed with at least one swivel arm of the two swivel arms to correct a determination of a mass by a current acceleration value.
2 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a dynamic scale for bulk material, having two swivel arms (2) and two load-lifting arms (8) mounted to the free end of said swivel arms, with one hole (7) being located in each of the swivel arms (2) and positioned transversely to the extension of the swivel arm and also transversely to the neutral fiber brought about by the flexural load. A pipe (9) is fitted into the hole (7) and is welded thereto. The pipe (9) comprises two sensors (14, 15) transversely to the longitudinal axis thereof, said sensors being located at an angle of substantially 90° to each other and each being disposed at an angle of ±45° to the direction of the shear stress component τxy. Under the influence of the shear stress, the cross section of the tube (9) is deformed into an ellipse that is inclined at about 45°, the shorter and longer axis (11, 13) thereof being measured using the sensors (14, 15). Said sensors (14, 15) each comprise two force inlets (16, 17), which are inserted with pretension in suitable recesses in the tube (9).
18 Citations
9 Claims
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1. A dynamic scale for bulk material comprising:
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two swivel arms; a sensor disposed with each swivel arm of the two swivel arms to measure a shear stress in each swivel arm of the two swivel arms, the sensor comprising; a hole being oriented generally transverse to a neutral fiber of a bending strain of a swivel arm of the two swivel arms; at least one sensing element disposed in the hole and oriented generally transverse to a longitudinal axis of the hole, the at least one sensing element being able to measure changes in a diameter of the hole resulting from shear stress; and wherein the at least one sensing element is inserted and at angle of approximately ±
45°
to a direction of a shear stress τ
xy of the swivel arm of the two swivel arms; andan acceleration sensor disposed with at least one swivel arm of the two swivel arms to correct a determination of a mass by a current acceleration value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification