Problem to be solved: to improve the operational control of the rice husk preparation equipment.Solution: the rice husk preparation facility comprises a rice milling machine and an optical sorting machine installed in a later step of the rice husking machine.The optical sorting apparatus comprises a first communication interface and a notification data transmitting section configured to transmit the notification data for notifying the occurrence of a predetermined event in the optical sorting machine to the hoisting machine.The rice husking machine has a switching valve configured to be capable of switching the valve position between the discharge position and the circulating position, a switching valve control unit, a second communication interface, and a communication monitoring unit for periodically transmitting the dead monitor monitoring data to monitor the communication state.The switching valve control unit is configured to switch the position of the valve of the switching valve to the circulation position when the switching valve is in the discharge position when the response is not received for a predetermined period of time and that one of the received data is received.Diagram
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