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Abstract

An improved concrete mixing plant is mounted on several mobile chassis to provide portability. The plant includes a horizontally oriented, internally urethane coated mixing drum having spiral and lift flights such that the rate of discharging concrete material is controllable without altering the direction or rate of rotation. The drum and chute are self-erecting from a low-profile, transport configuration to an elevated, mixing configuration. A water dispensing system wherein the water is automatically measured volumetrically or, alternatively, gravimetrically provides automatic cleaning of internal surfaces of the mixing drum as an integral part of the batching process. Feeder belt and weigh-bridge arrangements are interposed between bins containing denser ingredients and a collecting conveyor to provide a first surge capability. A hopper and load cell arrangement is interposed between a compartmented silo and a surge conveyor to provide a further surge capability. A ploughing arrangement places lighter ingredients within a furrow in the denser ingredients to minimize generation of airborne particulate matter within the surge conveyor. A baghouse filter and blower arrangement creates a negative pressure relative to ambient atmosphere within a containment system for eliminating contamination from airborne particulate matter. A control unit interconnecting the various components substantially automates the plant.

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First Claim