Thermoplastic sheath surface micro-processing device

The utility model relates to a thermoplastic sheath surface microprocessing device which comprises an outer pipe, an inner pipe and a fan, annular blocks are arranged at the two axial ends of an inner cavity of the outer pipe, and a ventilation opening is formed in the position, between the two annular blocks, of the side wall of the outer pipe; the inner pipe is located in the outer pipe and is coaxial with the outer pipe, one end of the outer wall of the inner pipe is fixed to one annular block, and the annular block at the end can just block a gap between the inner circular pipe and the outer circular pipe; the outer wall of the other end of the inner pipe is provided with a first annular groove, the other annular block is provided with a second annular groove, a gap between the first annular groove and the second annular groove forms an annular air blowing opening, and the air blowing direction faces the central axis. The fan is used for supplying air to the ventilation opening; the device has the advanta