2results about How to "Increase flight altitude" patented technology

The invention relates to the field of powder grading, in particular to a powder hollowness grading device and method based on terminal settling velocity difference. The device comprises a feeding unit used for supplying powder; the dispersion conveying unit comprises a conveying channel and two fan blade rotating devices, the conveying channel is obliquely arranged downwards from left to right and used for receiving the powder supplied by the feeding unit and allowing the powder to slide down along the conveying channel, and fan blades of the two fan blade rotating devices are embedded in the conveying channel side by side in the front-back direction; the airflow grading unit comprises an air cavity and an air outlet device, the air cavity is obliquely arranged upwards from left to right, an air outlet is formed in the upper end of the air cavity, an air inlet is formed in the lower end of the air cavity, the air outlet directly faces an outlet in the lower end of the conveying channel, and the air outlet device is used for blowing air to the air inlet of the air cavity; and the collecting unit is used for collecting the powder graded by the airflow grading unit. Accurate grading of the hollowness degree of the powder can be achieved based on the density difference, and the purity of the target solid powder is improved.

The present application relates to a kind of one-way swingable unmanned aerial vehicle strip sowing seed tube device of non-driven folding type, including strip sowing seed metering device connection device, normally closed electromagnet driven limiting device, rigid carbon fiber seed tube, flexible bellows, one-way swing assembly of fixed bellows and the roller of each joint connection place thereon.When unmanned aerial vehicle takes off, the gravity of seed tube itself is used to unfold without driving, and when unmanned aerial vehicle lands, the weight of fuselage is used to fold without driving.When operating, the upper end position of seed tube is fixed, the end can swing freely in one direction, and the length of seed tube can be set according to the size of rotor airflow.The present application has compact and ingenious structure, ensures the safety of unmanned aerial vehicle blind take-off and blind landing operation, realizes strip sowing operation in two seed dropping postures of seed tube end close to ground or trailing, and achieves the purpose of effectively inhibiting the interference of rotor airflow on falling seeds and the effect of seed large speed touch ground rebounding.