Ventilation amount detection device for coal mining work surface

The invention provided with a ventilation amount detection device for a coal mining work surface. According to the detection device, the ventilated air of the work surface is collected first and thenpressurized, and the ventilation amount is judged according to the internal air pressure. The device is characterized in that an upper box body is in screw joint with a lower box body and is combinedwith the lower box body to form a cavity, and a sealed clamping ring is positioned between the upper box body and the lower box body. A fixing sleeve is placed on the upper box body, the inner wall ofthe fixing sleeve is provided with a thread, two through holes are symmetrically formed in the lower box body, one end of each silica gel hose is placed on the corresponding through hole, and the other end of each silica gel hose is placed in the lower box body, wherein there are two silica gel hoses in total; one end of each silica gel hose is expanded by the pipe wall of the corresponding through hole, an inner sleeving pipe is placed in an inner ring of the sealed clamping ring, the sealed clamping ring is made of ceramic, and a layer of rubber cushion is arranged on the surface; the innersleeving pipe is a copper pipe piece, a corrugated pipe is placed in the upper box body, one end of the corrugated pipe is placed between the sealed clamping ring and the upper box body, the other end of the corrugated pipe is in sealed connection with the outer brim of a bearing ring in a main box, and the fixing sleeve is placed above the bearing ring.