Dustless mixing apparatus and method for combining materials
OwnerJames H. Backus, Charles E. Cornwellinventors
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Abstract
This invention consists of a mixing method for dustless dry cementitious compositions and apparatus for combining materials without loss or escape of dust.
Claims17
A dustless mixing method using a closed container supplied with materials to be combined comprising the steps of:
- a. metering a first material into the container;
- b. establishing a vortex in the metered material;
- c. developing a vacuum in the container to draw off air displaced by said materials;
- d. metering further material to the container;
- and
- e. mixing said materials through the use of said vortex.
The dustless mixing method including creating a creamy slurry of water and cement in a container through the use of one or more concave impellers rotating in the container to cause vortex-type mixing without generating heat, comprising the steps of:
- a. spraying the container interior with metered spray water;
- b. establishing rotation of the impeller;
- c. metering the water into the container for establishment of the vortex;
- d. metering the cement into the container for combination with the water to create the creamy slurry;
- e. exhausting and filtering the air displaced in the container to trap any cement dust;
- f. mixing said water and cement for a predetermined interval;
- g. discharging said slurry onto moving sand and gravel aggregate;
- h. secondarily mixing the slurry with said sand and gravel aggregates to produce concrete;
- and
- i. the said metered water step washing the trapped dust back into the container for use during the next cycle.
Apparatus for dustless mixing of materials comprising in combination:
- a. a mixing container;
- b. one or more symmetrical impellers mounted for rotation within said container;
- c. means for rotating said impellers at a predetermined rpm;
- d. means for metering a first material into said container, said impellers establishing agitation of the metered material;
- e. means for metering further material to the container for mixing with said first metered material through the use of said impellers;
- f. said first material being a fluid and further comprising means for spray cleaning the container with said fluid metered under pressure;
- and,
- g. means for combining a measurement of the metered volume of spray cleaning fluid along with a measurement of the volume of fluid metered to determine the total amount of fluid metered into the container.
Apparatus for dustless mixing of water and cement into a creamy slurry through the use of vortex-type mixing without generating heat, comprising in combination:
- a. a mixing container;
- b. a plurality of symmetrical concave impellers of like diameters stacked in spaced apart positions upwardly of the container bottom and mounted for rotation;
- c. means for rotating the impellers at a velocity of approximately 30 miles per hour tip speed;
- d. means for spraying the interior of the container with spray water to wash it;
- e. means for metering slurry forming water into the container for the establishment of the vortex;
- f. means for metering the cement into the container for combination with the water to create the creamy slurry;
- g. vane means within the container and against a portion of the periphery thereof for modifying the turbulence of the vortex by redirecting the slurry;
- h. foam cell filtering means in communication with the container;
- i. means for evacuating air from the container through the filter means to trap cement dust;
- j. means for directing the metered water through the filter means to return the trapped cement dust to the container on a succeeding cycle;
- and
- k. means for discharging said slurry on moving sand and gravel aggregates for further mixing thereof.
Apparatus for dustless mixing of materials comprising in combination:
- a. a mixing container;
- b. one or more symmetrical impellers mounted for rotation within said container;
- c. means for rotating said impellers at a predetermined rpm;
- d. means for metering a first material into said container, said impellers establishing a vortex in the metered material;
- e. means for metering further material to the container for mixing with said first metered material through the use of said vortex;
- f. said first material being a fluid and further comprising means for spray cleaning the container with said fluid metered under pressure;
- and,
- g. means for combining a measurement of the volume of spray cleaning fluid along with a measurement of the volume of fluid metered to determine the total amount of fluid metered into the container.
A dustless mixing method using a closed container supplied with materials to be combined comprising the steps of:
- a. metering a first material into the container;
- b. establishing agitation in the metered material;
- c. metering further material to the container;
- d. developing a vacuum in the container to draw off air displaced by said materials as the materials enter the container;
- and
- e. mixing said materials within the container.
Dependencies are inferred from the claim text.