Air volume measuring device for total-section anti-blocking coal mill

The utility model discloses a total-section anti-blocking coal mill air volume measuring device. Local contraction is adopted to increase the flow speed of fluid to generate a large differential pressure signal, the throttling loss is large correspondingly, and the output of an air feeder is increased. The wing type pressure tapping hole is small and is very easy to block. The device comprises a plurality of measuring pipes (1) arranged perpendicular to an air duct and a main pressure guiding pipe (5), each branch pipe (13) of the main pressure guiding pipe is located between every two adjacent measuring pipes, and each branch pipe of the main pressure guiding pipe is communicated with the measuring pipes on the two sides through connecting pipes (8); the measuring tube is formed by fixing two square tubes (9) in a back-to-back mode, and inclined notches which are symmetrically arranged are cut in the upper end and the lower end of one square tube; an inclined notch is formed in the air inducing surface of th