The plant protection drone spraying system mainly includes medicine boxes, water pumps, hoses and nozzles. The nozzle is an important part of the spraying system, which directly affects the spray atomization effect, pesticide utilization rate and operation efficiency.
In this issue, we will introduce you to the main types of nozzles in the plant protection flight defense operation: the advantages and disadvantages of pressure nozzles and centrifugal nozzles.
(Image from the network)
First, the principle:
Pressure nozzle: The pressure generated by the liquid pump causes the liquid to disperse into fine droplets under pressure by the nozzle. The nozzle pressure and the size of the pore size affect the size of the droplet formed.
Centrifugal nozzle: The motor rotates the nozzle at high speed, and the liquid is dispersed into fine droplet particles by centrifugal force. The magnitude of the motor voltage affects the size of the droplet formed.
Second, the advantages:
Pressure nozzle: The pressure under the liquid medicine is large, the penetration is strong, and the amount of liquid medicine generated is small, which is not easy to be evaporated due to high temperature and drought. Moreover, the spray system is relatively simple in construction and low in cost.
Centrifugal nozzle: The particle size of the droplet produced is smaller, the diameter of the droplet is not much different, the atomization of the liquid is uniform, the atomization effect is good, and the flow rate and droplet size are easily controlled by remote control.
Third, the shortcomings:
Pressure nozzle:
1) The atomization of the liquid is not uniform, the diameter of the droplets is quite different, and the powder is particularly prone to blockage.
2) Since the particle size of the droplet can only be adjusted by replacing the nozzles of different aperture sizes, it is easy to cause a large amount of spray and cause phytotoxicity during the acceleration of the takeoff and the turning of the ground.
Centrifugal nozzle:
1) The liquid medicine is relatively easy to lose, and the liquid medicine is evenly distributed evenly on a unit area, and the unevenness coefficient is poor.
2) The accessories of the centrifugal nozzle are prone to problems. The motor with the brush motor version is easily damaged, the life is short, the replacement frequency is high, and the cost of the brushless motor version is high.
Fourth, summary:
Different crops and different control objects are suitable for different droplet sizes. Studies have shown that different control objects are suitable for different droplet sizes. For example, insecticides for controlling flying pests, the droplet size is preferably 10 to 50 micrometers, and the contact herbicide is preferably 100 to 300 micrometers.
Therefore, whether it is a pressure nozzle or a centrifugal nozzle, it is necessary to fully understand their respective advantages and disadvantages, in order to rationally and scientifically solve the problem and obtain good control effects.
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