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Granular Material Metering Apparatus

IP.com Disclosure Number: IPCOM000211479D
Publication Date: 2011-Oct-06
Document File: 3 page(s) / 106K

Publishing Venue

The IP.com Prior Art Database

Abstract

This apparatus is a mechanical device to control the flow of granular material. The device uses an orifice of variable geometry. When the device is opened, material will flow through the orifice when the material is acted on by a force (i.e. pneumatic pressure, gravity, etc.). Manipulation of the orifice geometry will allow for control of the rate of material though the apparatus. The combination of multiple devices that may be of various shapes and size ranges allows for a wide range of flowrates and high resolution for control of the material rate.

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Granular Material Metering Apparatus

Abstract

This apparatus is a mechanical device to control the flow of granular material. The device uses an orifice of variable geometry. When the device is opened, material will flow through the orifice when the material is acted on by a force (i.e. pneumatic pressure, gravity, etc.). Manipulation of the orifice geometry will allow for control of the rate of material though the apparatus. The combination of multiple devices that may be of various shapes and size ranges allows for a wide range of flowrates and high resolution for control of the material rate.

Description

Granular material is stored (large volume or small surge volume) in a collection device (i.e. hopper, bin, tank, etc.) above multiple metering devices. The metering devices have orifices of which the opening size can be varied. Opening the device allows granular material to pass through at some controlled rate when the granular material is acted on by a force (i.e. pneumatic pressure, gravity, etc.). Integral to the design are multiple devices. A larger orifice open area in a device allows a high rate of material to pass through while a smaller open area in a device increases control resolution by allowing a small rate of material to pass through. The smaller opening is used for a higher resolution control of the total rate.

For low material rates, all of the material would pass through the smaller opening. Once a device is opened some predetermined amount, another orifice would open. The combination of open areas would provide high control resolution as well as high total rate.

Controls for the orifices are similar to those for sand screws currently on blending equipment. Orifices could be opened to a specific position determined by empirical data for different granular materials. Orifice position could also be proportionally controlled by a metering device (difference in rate, densometer, meter-by-weight loss, etc.) through a feedback loop.

Device Arrangements Examples

Small and Large Orifices

 Small metering device  partially open for low rates  and high resolution control 

Large metering device opens  for higher rates 

Collection  device 



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Multiple Small Orifices Similar Sized Orifices

Collection  device 

 Small metering device  partially open for low rates  and high resolution rate  control 

Multiple small ...