Calibrating device for weir trough open channel flow meter

The invention relates to a calibrating device for a weir trough open channel flow meter. The calibrating device for the weir trough open channel flow meter is mounted on a testboard; one side of the testboard and one side of a movable plate are fixedly connected through screws by using a leak-proof material; the other side of the movable plate and the outlet of a rectangular groove are fixedly connected through screws by using the leak-proof material; a rectifying plate is arranged at the place which is behind the entry of the rectangular groove with a certain distance; a standard flow meter is mounted at the pipeline for connecting a buffer tank and the inlet of the rectangular groove; and a water pump is arranged in the front of the butter tank and connected to the butter tank through a pipeline. The calibrating device for the weir trough open channel flow meter is simple in structure, utilizes a comparison method to calibrate the weir trough open channel flow meter, improves the accuracy of the sewage flow metering of the weir trough open channel flow meter, avoids economic dispute between the environmental protection administration and enterprises in a sewage charging clearing process, improves the reliability of sewage metering data, and is conducive to enterprises to reduce sewerage discharge and improve energy saving and emission reduction work by technological innovation.