Back to results
US 7,320,539 B2Granted
Concrete batching facility and method
AssigneeMcNeilus Truck and Manufacturing, Inc.
InventorsRonald E. Christenson, Robert J. Horton
Life of this patent
Estimating the term…
Abstract
A concrete batch mixing system and method are disclosed that enable the batch master to measure and control both the water and cementitious ingredient feeds in relation to each other so as to be able to blend the two ingredients in a known, selected, adjustable and repeatable manner, and to agglomerate these ingredients in a counter-rotating twin screw mixing apparatus for use in the preparation of batches of mixed concrete in a concrete batching process.
Claims16
A concrete batching system comprising:
- (1) a pre-mixing system for pre-mixing a selected portion, but less than all, of a concrete batch, said premixing system further comprising:
- (a) a cementitious ingredient supply system including a weigh batcher for apportioning weighed amounts of cementitious ingredients for concrete batches excluding stone and sand aggregate materials;
- (b) a pre-mixer agglomerator for blending said cementitious ingredients and wetting agents excluding said aggregate materials to form a concrete pre-mix fraction of a concrete batch, said agglomerator having spaced inlet and discharge openings toward opposite ends thereof and including a twin screw mixing and conveying system having intermeshing screw conveyors for both mixing and conveying said ingredients, said screw conveyors being further characterized by a variable pitch that increases from inlet to discharge;
- (c) a pre-feeder for metering said cementitious ingredients at a selected, controlled feed rate into said pre-mixer agglomerator;
- (d) a liquid supply system for supplying a selected amount of wetting agents at a selected rate for blending with said cementitious ingredients in said pre-mixer agglomerator;
- (e) a control system for controlling the amounts and rates in apportioning and mixing of cementitious ingredients and wetting agents in said concrete pre-mix;
- (2) an aggregate supply system configured to supply aggregate ingredients only directly to a final mixing vessel bypassing said pre-mixing system;
- and
- (3) a final mixing vessel for receiving premixed material from said pre-mixing system and aggregate from said aggregate supply system and conducting final mixing of ingredients.
6 more elements
A concrete batching apparatus comprising:
- (1) a pre-mixing system for pre-mixing a selected portion of a concrete batch, said pre-mixing system further comprising:
- (a) a cementitious ingredient supply system including a weigh batcher for apportioning weighed amounts of cementitious ingredients excluding aggregate materials for concrete batches;
- (b) a pre-mixer agglomerator for blending said cementitious ingredients and said wetting agents to form a concrete pre-mix, said agglomerator being further characterized by a twin screw mixing and conveying system wherein said twin screw mixing and conveying system is characterized by intermeshing screw conveyors which both mix and convey said ingredients, said mixing and conveying system having an inlet metering section featuring a narrow pitch, a mixing section having a pitch greater than that of the inlet metering section and a discharge section having a pitch greater than that of the mixing section;
- (c) a prefeeder for metering each weighed amount of cementitious ingredients at a selected, controlled feed rate into said pre-mixer agglomerator;
- (d) a liquid supply system for supplying a selected amount of wetting agents at a selected rate for blending with said cementitious ingredients in said pre-mixer agglomerator;
- (e) a control system for controlling the amounts and rates in apportioning and mixing of cementitious ingredients and wetting agents in said concrete pre-mix;
- (2) an aggregate supply system configured to supply aggregate ingredients directly to a final mixing vessel bypassing said pre-mixing system;
- and
- (3) a final mixing vessel for receiving premixed material from said pre-mixing system and aggregate from said aggregate supply system and conducting final mixing of ingredients.
6 more elements
Dependencies are inferred from the claim text.