Relaciones entre biodiversidad y produccin en sistemas silvopastoriles de Amrica Central

Yarn hanging and blowing nozzle structure, comprising mainly a hollow housing in which is a fixed block, at one end of the fixed block is an air inlet, on top of the fixed block are a movable first slide block and a second slide block, between the two slide blocks is a driving mechanism, for moving the first and the second slide blocks in opposite directions, a block piece located in the housing corresponding to the air inlet of the fixed block and between the two slide blocks, the block piece having an air hole that communicates with the air inlet; so, before blowing air on the yarns, the yarns are hanged on the block piece, the first and the second slide blocks are respectively driven to move in opposite directions, so the air inlet communicates with the air hole, and the block piece is obstructed by the second slide block, so the compressed air is blown directly onto the yarns, thus the operator needs only move the two slide blocks to expose the block piece outside the housing for either yarn hanging process or for cleaning purpose on the block piece.