| 摘要 |
A linearized gate control for multiple hopper-feeders of the cold feed system of an asphalt plant is disclosed. Each hopper includes a cam, driven by a position servo motor, which opens or closes the gate governing the flow of aggregate from the hopper to its feeder, the latter being driven at a constant speed. The cam is profiled so that equal increments of motor shaft rotation produce equal increments of gate opening. The servo motors of all hoppers are connected into an electrical bridge circuit such that, after the respective proportionate openings of the gates are initially established by the setting of individual electrical controls for the gate motors, adjustment of a single master control to produce a certain percentage increase or decrease in the total aggregate delivered from all the hoppers will also increase or decrease the opening of each gate by the same percentage, as the case may be.
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