Cotton suction air pipe for spinning frame

The utility model relates to a cotton suction air pipe for a spinning frame, which comprises a negative pressure air pipe, a plurality of flexible pipe joints and a plurality of cotton suction branch pipes, the section of the negative pressure air pipe is rectangular, the front upper part of the rectangle is provided with an inclined plane inclining backwards, and two ends of the negative pressure air pipe are fixedly provided with a front cover plate and a tail end cover plate. A plurality of suction holes are formed in the inclined surface of the negative pressure air pipe, each suction hole is provided with a conical hole which is contracted inwards and protrudes upwards and a connecting plane at the top, and a hole opening communicated with the cotton suction branch pipe is formed in each connecting plane; a concave ring groove on the periphery of a clamping seat of the pipe joint is clamped on the upper surface and the lower surface of the connecting plane and is hermetically connected with the inclined