US 5,312,299 AGranted

Grain flow measuring device, in particular for harvesters

AssigneeClaas oHG beschrankt haftende offene Handelsgesellschaft

InventorsWilli Behnke, Norbert Diekhans

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Abstract

A grain flow measuring device having a sensor plate, on which a piezo-crystal oscillation sensor is disposed behind an impact surface, behind which an oscillation-damping foam material body is maintained by means of doubly folded-over edges of the sensor plate located at its edges. A retainer plate is seated and an amplifier and evaluation circuit with a readable counter is disposed in the foam material body. Grain flow measuring devices of this type are disposed in a harvester below a rocker tray near its output side, because of which grain losses and false measurements are avoided. Damping of the impact surface by means of the foam material body results is such oscillation damping that the determination of the grain mass results from the detected number of oscillations.

Claims17

Dependent claims

A grain flow measuring device for placement in a grain flow of a grain harvester, said measuring device comprising;

a sensor plate (1)
a peizoelectric oscillation sensor (2),
said peizolectric oscillation sensor (2) located and engaged at a center of one side of said sensor plate (1),
an opposite side of said sensor plate located in a grain flow path as an impact surface (10),
an amplifier device (3) in said measuring device and spaced from and connected to an input of said oscillation sensor (2),
wherein, an entire edge area of said sensor plate (1) has folded-over edges (11, 12, 13, 14),
each of said folded-over edges having a doubly folded-over edge forming with said sensor plate and said folded-over edges, a box-like frame,
a soft foam damper material inserted within said frame and a retainer plate (5) seated in said soft damper material spaced apart from said frame.

5 more elements

Dependencies are inferred from the claim text.