Sprinkler of plant protection drone spraying system
The plant protection drone was first used for plant protection, considering its planting performance, and secondly the attribute characteristics of the drone.
As the saying goes, "If you want to do something good, you must first sharpen your weapon." You want to do a good job of flying defense. In addition to the hard-working iron itself, you must also have a plant protection machine that will come. And this will come, not only in the flight control system, power system, positioning system, etc., but also the choice of spray system is also very particular, today we say the direct impact of the spray effect in the spray system - the nozzle.
At present, there are two types of nozzles mainly used in plant protection drone spraying systems: pressure nozzles and centrifugal nozzles.
Pressure nozzle and centrifugal good PK
Many new flying players may still be entangled. Which effect is better? Let's compare their advantages and disadvantages first.
The principle of the fan-shaped pressure nozzle is to apply a certain pressure to the liquid medicine through the pressure pump to spray out the fan-shaped pressure nozzle, and the diameter of the droplet of the medicine liquid is generally 70-120 micrometers.
Advantages: The pressure under the liquid medicine is large, the penetrating power is strong, the amount of liquid medicine generated is small, and the evaporation amount is small in arid areas; Disadvantages: the liquid atomization is uneven, the diameter of the droplets is different, and the nozzle Easy to block, especially when spraying powder.
The principle of the centrifugal nozzle is to drive the centrifugal nozzle to rotate at a high speed by the motor to take out the liquid and then use the centrifugal force to pull out. Advantages: uniform atomization of the liquid, good atomization effect, little difference in diameter of the droplets; Disadvantages: the accessories of the centrifugal nozzle are prone to problems, the motor of the brush motor version is easy to damage, the life is short, the replacement frequency is high, no The cost of the brush motor version is relatively high; and the centrifugal nozzle basically has no downforce, completely relying on the wind field pressure of the drone, which is more elegant than the pressure nozzle, and is inferior to high crops and fruit trees. some.
Where is the choice of nozzles?
From the above comparison, it is not difficult to see that the pressure nozzle and the centrifugal nozzle have their own advantages and disadvantages. In the face of different working environments and crops, choosing the best nozzle will make the operation more effective.
Look at the model Generally speaking, the pressure nozzle is better used on a single rotor. The centrifugal nozzle is better matched with the multi-rotor.
If the crop is a high-density crop, the pressure nozzle will be more suitable. For example, if the cotton sprays the defoliant, the penetration of the pressure nozzle is stronger and the effect will be better. On the contrary, if the crop density is not particularly large, and the atomization effect is good, the centrifugal nozzle will be more suitable, such as wheat, rice spraying foliar fertilizer, and some common crop pest control, centrifugal nozzle is a better choice. For example, pest control of wheat and rice.
One of the fatal shortcomings of the drug pressure nozzle is that it is easy to block. Therefore, when spraying powder pesticides, try to avoid using pressure nozzles, and it is better to use centrifugal nozzles. When spraying water medicines, pressure nozzles and centrifugal nozzles are more suitable. In this case, the most suitable nozzle can be selected according to the model and crop.
In general, no one can replace the sprinklers. We can decide whether to use centrifugal nozzles or pressure nozzles depending on the crops being sprayed. However, the nozzle blockage of the plant protection drone is usually related to the agent used in the operation. It is suitable for planting unmanned aerial vehicles. There are few aviation special medicines. Some of the common medicines such as emulsifiable concentrates and liquid medicines are suitable for flying defense operations. We should use aviation special medicines as much as possible in the matching of pharmaceuticals, even if ordinary medicines are used. The choice of powder and other dosage forms, due to the high concentration and low volume use characteristics of the fly defense operation, the improper selection of the dosage form is also a major cause of nozzle blockage.
Influencing factors of spraying effect
Choosing the right spraying equipment according to the above method can reduce the effect on the effect to some extent. However, no matter which kind of spraying equipment is used, the spraying effect will be affected by many other factors, such as:
Operating conditions - meteorology, wind speed, temperature, etc., the wind speed is too high to increase the flow, high temperature operation will accelerate evaporation, rain and water weather will cause erosion of the liquid within a day;
Flight parameters - flight altitude, flight speed, flow control, etc. These parameters need to be balanced and accurately grasped to ensure that they do not suffer from the critical effects.
to sum up:
Under normal circumstances, the two types of nozzles can be used universally, but when it is necessary to pay attention to it, it is necessary to choose the plant protection nozzle according to the advantages and disadvantages of the nozzle itself, and the type of machine, the sprayed crop and the medicament.
Dosing must pay attention to filtration, filter out large particles of impurities (now plant protection machine kits are equipped with filter components);
When working, the concentration can be appropriately reduced. Although increasing the amount of acre in this way seems to reduce the efficiency of the operation, it can effectively reduce the failure rate of the nozzle, and is also a way to ensure efficiency;
At the end of each operation, the nozzle should be cleaned, and good maintenance habits can effectively increase the life of the nozzle.