One of the main ways to increase the rotary excavator productivity is to automate excavator operation. The article presents an automatic speed adjustment system for the stacking conveyor belt of a trench rotary excavator. It is shown that the automated control system will allow taking into account the rotor actual rotation speed and the bucket fill factor, processing data and solving tasks of the excavator operation automatic control in excavation mode. The represented automated control system will ensure the conveyor operation with the necessary, but not maximum speed. Therefore, the conveyor will not work “in vain”, that, in its turn, will reduce operating costs including energy.
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