A slender and funnel-shaped jet nozzle structure, comprising: a plurality of slender tapered diversion channels; a plurality of slender jet nozzle; and a conveyer belt; wherein a wall thickness of each of the plurality of slender tapered diversion channels is 1-5 mm; a wall thickness of each of the plurality of the slender jet nozzles is 1-5 mm; and a thickness of the conveyer belt is 1-5 mm; the slender tapered diversion channel is a hollow slender truncated cone and comprises an upper opening and a lower opening; wherein the upper opening of the slender tapered diversion channel is a slender elliptical opening, and the lower opening of the slender tapered diversion channel is connected to an inlet of the slender jet nozzle; and the slender jet nozzle is a hollow slender elliptic cylinder; the plurality of slender tapered diversion channels are in a linear arrangement, and a distance between two adjacent slender tapered diversion channels is 70-90 mm; the upper opening of the slender tapered diversion channel has a section with a length of 55-60 mm and a diameter of semicircles on both sides of 40-50 mm; and a height of the slender tapered diversion channel is 30-50 mm; the distance being a distance between geometric centers of two elliptic sections of the two adjacent slender tapered diversion channels; and an outlet of the slender jet nozzle has a section with a length of 15-20 mm and a diameter of semicircles on both sides of 4-6 mm; and a height of the slender jet nozzle is 20-40 mm; the conveyer belt is arranged just below the slender jet nozzle, and a distance between the conveyer belt and the slender jet nozzle is 20-40 mm. a plurality of slender tapered diversion channels; a plurality of slender jet nozzle; and a conveyer belt; wherein a wall thickness of each of the plurality of slender tapered diversion channels is 1-5 mm; a wall thickness of each of the plurality of the slender jet nozzles is 1-5 mm; and a thickness of the conveyer belt is 1-5 mm; the slender tapered diversion channel is a hollow slender truncated cone and comprises an upper opening and a lower opening; wherein the upper opening of the slender tapered diversion channel is a slender elliptical opening, and the lower opening of the slender tapered diversion channel is connected to an inlet of the slender jet nozzle; and the slender jet nozzle is a hollow slender elliptic cylinder; the plurality of slender tapered diversion channels are in a linear arrangement, and a distance between two adjacent slender tapered diversion channels is 70-90 mm; the upper opening of the slender tapered diversion channel has a section with a length of 55-60 mm and a diameter of semicircles on both sides of 40-50 mm; and a height of the slender tapered diversion channel is 30-50 mm; the distance being a distance between geometric centers of two elliptic sections of the two adjacent slender tapered diversion channels; and an outlet of the slender jet nozzle has a section with a length of 15-20 mm and a diameter of semicircles on both sides of 4-6 mm; and a height of the slender jet nozzle is 20-40 mm; the conveyer belt is arranged just below the slender jet nozzle, and a distance between the conveyer belt and the slender jet nozzle is 20-40 mm.