Novel variable mist spraying system based on unmanned rotorcraft

Abstract

The invention relates to a novel variable mist spraying system based on an unmanned rotorcraft. The novel variable mist spraying system consists of three parts, i.e. an electric centrifugal spray head speed regulating system, a remote control system and a host computer system. The electric centrifugal spray head speed regulating system comprises an ARM main controller, a sensor and a spray head; the remote control system comprises an ARM main controller, an LCD and keys; and the host computer system can display the sensor data and transmit an instruction to change a PWM duty ratio. The whole system has two modes, i.e. a manual mode and an automatic mode. At the manual mode, needed mist drops can be obtained by changing the rotating velocity of an atomizing disc. At the automatic mode, a volume median diameter (Dv50) of the mist drop which is equal to 100 micrometers is taken as a target, a relational expression between the rotating velocity of the atomizing disc and the temperature, humidity and height is obtained according to a test, the rotating velocity of the atomizing disc can be changed by considering the volatilization factor in the mist drop falling process, so that the volume median diameter of the mist drops deposited on leaves of crops can be always about 100 micrometers. The variable spraying device has the effects of water conservation and environment protection.

Description

technical field [0001] The invention relates to a new variable spray system based on a small rotor UAV, which can accurately adjust spray parameters in manual and automatic modes. The device is used for aerial spraying of small rotor plant protection UAVs. In the automatic mode, fog According to the influence of volatile factors during the droplet falling process, according to the flying height when spraying and the atmospheric temperature and humidity at that time, the rotation speed of the atomization disc is automatically adjusted in real time to ensure that the volume median diameter of the droplets falling on the crop leaves is about 100µm ( According to the content of the agricultural aviation operation quality operation index of the People's Republic of China, for low-volume and ultra-low-volume spraying, about 100µm is the best droplet diameter for most pesticides to eliminate pests and diseases); in manual mode, change the electric centrifugal nozzle through the host c...

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Problems solved by technology

[0002] my country is a large agricultural country, and the research and development level of pesticides has been in the forefront of the world, but the development and application level of plant protection machinery is still lacking. The size of the droplet size in the actual pesticide spraying operation has a great influence on the effect of eliminating pests and diseases. The impact of the volatile factors on the size of the droplet size during the droplet falling process cannot be ignored, otherwise the deposition characteristics of the droplet on the crops cannot meet the requirements.

For example, when the weather temperature is high and the relative humidity is low, the droplets with too small particle size will volatilize a lot during the falling process and easily drift to other farmlands. It is also very unsatisfactory. Due to the volatilization of water, the concentration of the local medicinal solution is too high, which is easy to cause phytotoxicity. On the contrary, when the relative humidity of the air is high and the temperature is low, it is easy for the droplets with too large particle size to attach to the crops. Rolling off the leaves of plants, the attachment rate and attachment time are low, which does not achieve the ideal purpose of preventing pests and diseases and pollutes the soil

In the same way, different spraying heights lead to different falling distances of droplets, and volatile factors also have a great influence on the parameters of droplets

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