Sensor apparatus with butterfly valve for maintaining packing de

Details Sensor apparatus with butterfly valve for maintaining packing de Sensor apparatus with butterfly valve for maintaining packing de

1998-02-25

2000-07-04

Will, Thomas B.

Crop threshing or separating

Transport conveyor

56 102B, 56DIG15, A01D 1702, A01F 1246

Patent

active

060831030

ABSTRACT:
In an agricultural harvester, a characteristic of crop material is sensed as the crop material is moved through a feed tube by an auger having flighting which terminates upstream of a sensing region. The auger flighting conveys crop material into the sensing region where it accumulates and then is pushed from the sensing region by further crop material conveyed into the region. This results in a more uniform packing density of the crop material in the sensing region where the measurement is made, provided the feed tube is oriented vertically or at a small angle relative to vertical. To obtain a uniform packing density when the feed tube is horizontal or inclined only slightly, a butterfly valve is provided downstream of the sensing region. The valve has flaps that are spring biased to a closed position to block the flow of crop material from the sensing region. When the crop material in the sensing region is packed to a sufficient density, the pressure of the crop material acting against the flaps overcomes the spring bias and the valve opens to permit flow of the crop from the sensing region.

REFERENCES:
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Hamid, Abdul et al. "Microwave Doppler-Effect Flow Monitor" IEEE Transactions on Industrial Electronics and Control Instrumentation, vol. IECI-22, No. 2, May 1975, pp. 224-228.

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