The Design And The Experimental Study Of The Suction Mouth Of The Pneumatic Grassland Locust Suction Trap Machine

The pneumatic grassland locust suction trap machine which controls locust with physical method is a new kind of machine for plant protection. Aiming to the lower rate of suction trap and locust bumping against the suction mouth wall and smashing etc. the push-pull suction mouth was designed, based on the theoretic analysis of the previous direct suction mouth, and the jumping and dodging characteristics of the locust when they are sucked and measuring of locust's suspension speed. The main factors e.g. the wind speed at the suction mouth and the blow mouth, the obliquity of the blow mouth, the width of the blow mouth which affect the form of the convolute air cover are studied. Comparing with the previous direct suction, the experiment results showed: (1) The wind speed of suction mouth was decreased from 20m/s to 14m/s, the axial and radial dimensions were extended 1.5~2 times of the previous suction trap dimensions, and the negative pressure suction trap field was enlarged 2~3 times of the previous negative pressure suction trap field, so the efficiency of suction trap will be greatly improved. (2) Under the condition of same negative pressure suction trap field, the flux of the push-pull suction mouth was decreased by above 30% than that of the previous direct suction mouth,, which can reduce burden of subsequent equipments. (3) The reasonable parameters of the convolute air cover and axial speed attenuation rule were found. The theoretical foundation is provided for design and improvement of the pneumatic grassland locust suction trap machine.