A method and system for metering proppant discharged from a storage container is disclosed. In certain embodiments, a method may comprise loading a known amount of a first proppant type into a storage container, detecting proppant at or adjacent to a discharge outlet of the storage container via one or more sensors coupled to the storage container, operating a metering device at a predetermined speed, wherein the metering device may be coupled to the discharge outlet of the storage container, and wherein the metering device may comprise one or more pockets for receiving the first proppant type. In certain embodiments, the method may further comprise dispensing a known amount of the first proppant type from the storage container via the metering device, wherein an encoder coupled to the metering device may emit pulses during the dispensing. In certain embodiments, the method may further comprise determining an amount of the first proppant type dispensed by at least one pocket of the one or more pockets of the metering device based at least in part on the pulses and determining a relationship between the known amount of the first proppant type dispensed by each pocket and a speed of the metering device.

A powdery material mixing degree measurement device includes a discharger configured to discharge mixed powdery materials to a filler configured to fill, with the powdery materials, a vertically penetrating die bore of a compression-molding machine including a table including the die bore, a slidable lower punch including an upper end inserted to the die bore, and a slidable upper punch including a lower end inserted to the die bore, a plurality of movable portions configured to move the mixed powdery materials to the discharger, and a sensor configured to measure a mixing degree of the mixed powdery materials in the movable portions.

A weighing apparatus comprise a large throw-in weighing hopper which is fed with objects having a weight which is less than a target weight of the objects, holds the objects which are weighed, and discharges the weighed objects; a plurality of medium throw-in weighing hoppers which are respectively fed with the objects having weights adjusted with a different ratio, hold the objects for which combination calculation is performed based on the weights of the objects, and discharge the objects based on a result of the combination calculation; and a loss-in weight hopper which is used in loss-in weighing and performs loss-in discharge of the objects.

The invention is a weighing and feeding system for accurate weighing of small quantities of material in pelletized form and feeding the weighed material to processing machines. In particular the invention, is suitable for the preparation of weighed quantities of masterbatch to be added with resin directly into injection molding or extrusion machines for the manufacture of plastic products.

The invention is a weighing and feeding system for accurate weighing of small quantities of material in pelletized form and feeding the weighed material to processing machines. In particular the invention, is suitable for the preparation of weighed quantities of masterbatch to be added with resin directly into injection molding or extrusion machines for the manufacture of plastic products.

A method and system for metering proppant discharged from a storage container is disclosed. In certain embodiments, a method may comprise loading a known amount of a first proppant type into a storage container, detecting proppant at or adjacent to a discharge outlet of the storage container via one or more sensors coupled to the storage container, operating a metering device at a predetermined speed, wherein the metering device may be coupled to the discharge outlet of the storage container, and wherein the metering device may comprise one or more pockets for receiving the first proppant type. In certain embodiments, the method may further comprise dispensing a known amount of the first proppant type from the storage container via the metering device, wherein an encoder coupled to the metering device may emit pulses during the dispensing. In certain embodiments, the method may further comprise determining an amount of the first proppant type dispensed by at least one pocket of the one or more pockets of the metering device based at least in part on the pulses and determining a relationship between the known amount of the first proppant type dispensed by each pocket and a speed of the metering device.

The method according to the invention provides a way to continue gravimetric weighing of bulk material during refilling of a gravimetric metered dispensing unit, and to determine the mass of the refilled bulk material using a refilling container during the filling operation material and so determine the actual mass flow discharged during refilling in real time or on average in order to adjust it to a target mass flow.

The method according to the invention provides a way to continue gravimetric weighing of bulk material during refilling of a gravimetric metered dispensing unit, and to determine the mass of the refilled bulk material using a refilling container during the filling operation material and so determine the actual mass flow discharged during refilling in real time or on average in order to adjust it to a target mass flow.

A method for determining a mass flow of bulk material in a conveyor line includes providing a conveyor line, continuously receiving bulk material, transporting the bulk material on the conveyor line, and discharging the bulk material at an end point of the conveyor line. The conveyor line includes an array of weighing cells having a plurality of weighing cells successive in a direction of transport.

A method for determining a mass flow of bulk material in a conveyor line includes providing a conveyor line, continuously receiving bulk material, transporting the bulk material on the conveyor line, and discharging the bulk material at an end point of the conveyor line. The conveyor line includes an array of weighing cells having a plurality of weighing cells successive in a direction of transport.