Method of controlling a mobile pugmill having a weight metering control system
First Claim
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1. A method of controlling a blending and mixing plant comprising the steps of:
- a) providing an ideal aggregate flow rate;
b) providing an ideal additive percentage set point;
c) sending the ideal aggregate flow rate to an aggregate process controller;
d) receiving a current aggregate flow rate signal from an aggregate sensor;
e) comparing the ideal aggregate flow rate to the current aggregate flow rate in the aggregate process controller;
f) calculating the ideal additive flow rate from the additive percentage set point and the current aggregate flow rate;
g) changing the current aggregate flow rate by sending an aggregate output signal from the aggregate process controller to an aggregate dispenser;
h) sending the ideal additive flow rate to an additive process controller;
i) receiving a current additive flow rate signal from an additive sensor;
j) comparing the ideal additive flow rate to the current additive flow rate in the additive process controller;
k) changing the current additive flow rate by sending an output signal from the additive process controller to an additive dispenser; and
l) repeating steps c-k at predetermined intervals.
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Abstract
A portable chassis-mounted continuous flow, blending and mixing plant utilizing a Programmable Logic Controller and belt scales to continuously meter and adjust the flow of aggregate as well as maintain the proper ratio and flow of additives, both dry and liquid.
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Citations
9 Claims
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1. A method of controlling a blending and mixing plant comprising the steps of:
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a) providing an ideal aggregate flow rate; b) providing an ideal additive percentage set point; c) sending the ideal aggregate flow rate to an aggregate process controller; d) receiving a current aggregate flow rate signal from an aggregate sensor; e) comparing the ideal aggregate flow rate to the current aggregate flow rate in the aggregate process controller; f) calculating the ideal additive flow rate from the additive percentage set point and the current aggregate flow rate; g) changing the current aggregate flow rate by sending an aggregate output signal from the aggregate process controller to an aggregate dispenser; h) sending the ideal additive flow rate to an additive process controller; i) receiving a current additive flow rate signal from an additive sensor; j) comparing the ideal additive flow rate to the current additive flow rate in the additive process controller; k) changing the current additive flow rate by sending an output signal from the additive process controller to an additive dispenser; and l) repeating steps c-k at predetermined intervals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification