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The final control effect of pesticides should be achieved through the use of medical devices and the use of technology. The good or bad performance of the sprayer will directly affect the uniformity of the spray. So, what are the performance standards for sprayer sprayers? Experts introduced this. The nozzle is an important part of the sprayer. Although it is small, it determines the amount of application, the size and uniformity of the fog, and so on. The nozzles are generally divided into two types. One type is a fan-shaped nozzle including a nozzle body, a filter, a nozzle, and a nozzle cap. The other type is a conical nozzle including a nozzle body, a filter, an eddy current, and a nozzle chip. Spraying herbicides with fan nozzles, spray insecticides, conical nozzles for fungicides. Fan nozzle material: copper, nylon, stainless steel, corundum porcelain, ceramics. The material of the nozzle determines the nozzle life. Generally, the copper nozzle has a life of 100 hours, nylon 200 hours, corundum porcelain 300 hours, and stainless steel, ceramics, and polymer materials for 400 hours. Nozzle life depends on the nozzle material, physical and chemical properties of the liquid, spray pressure, dosage and other factors. After the nozzle is worn and damaged, the flow, spray angle, and droplet size will all change. The quality of the nozzle is mainly reflected in the dimensional precision, material, and finish of the orifice. The material determines the service life, good smoothness can reduce the clogging, and the precision of orifice size determines the key factors such as flow rate, spray shape, droplet size and distribution uniformity. The domestic nozzle material is at least 30% or more, but it is off-line, rough-manufactured, and has poor accuracy, large errors, and many fakes. It should be imported. The selection of fan-shaped spray nozzles requires spraying of pre-emergence herbicides requiring large droplets, large amounts of liquid to be sprayed, and a spray volume of more than 200 liters per hectare. Under drought conditions, the amount of liquid spray is often increased, mainly to reduce drift losses. The volume of spray is not as great as 200 liters per hectare can meet the agronomic requirements. To prevent drought, even if the amount of liquid sprayed is 1000 liters per hectare, it is only 0.1 millimeters of rainfall. Before the seedlings, the fan nozzles with large spray angle and high flow rate should be selected, such as Teejet 11003 and Teejet 11004. The pressure at 3 kg is 1200 and 1600 ml/min, which is equivalent to 3 kg pressure and the speed of the vehicle is 6 km/h. 240, 320 liters, and the speed of 8 km / h liquid spray 180,240 liters per hectare. The post-emergence herbicide requires small droplets, a small amount of liquid to be sprayed, and a liquid volume of about 100 liters per hectare. The current problem is that the amount of liquid sprayed is too large and the type of the nozzle is not correct, especially when the amount of spray is increased under drought conditions. It is a large drop of fog, and it is not covered with foliage. After the seedlings, the fan-shaped nozzles with small spray angle and small flow rate should be selected, and the spray angle is preferably 65-80 degrees. Such as Teejet80015 type, when the pressure is 3.5 kg, the spray volume is 650 ml, and the speed is 6 km/h. With a volume of 130 litres per hectare, the speed is 8 km/h, and 97 litres per hectare. Under the condition of drought, 0.5%~1% of spray volume was added, and the vegetable oil type spray additive Xindebao and Yaoxiaobao could obtain stable efficacy. There are two kinds of cylindrical fan-shaped nozzle filters: one is made up of a body, a cover, and a filter; the other is made up of a body, a cover, a filter, a spring, and a ball, and has a function of preventing post-dripping. The body and the cover material are made of a polymeric material. , filter, ball, spring stainless steel, life of 400 hours or more. The aperture size of the filter should not be larger than half the size of the nozzle hole. Generally, the fan-shaped nozzles such as Teejet 11002, 11003, 11004, and 11005 are equipped with a 50-mesh filter, and the Teejet 8001 and 80015 fan-shaped nozzles are equipped with a 100-mesh filter. Cone nozzle A, hollow cone nozzle is also known as hollow cone nozzle. Fine droplets form within the hollow cone-shaped fog, with a spray pressure of 3 to 5 kg, suitable for spraying pesticides, fungicides and post-emergence herbicides and foliar fertilizers. B. Solid cone nozzles, also known as solid cone nozzles, form thicker droplets throughout the solid conical fog area, reducing drift and are suitable for use with spray automatic control devices. Spray pressure 1 to 3 kg. Suitable for spraying pre-emergence herbicides, post-emergence contact, herbicides, liquid fertilizers, etc. C. The maximum length of service life of the nozzle plate material and copper is 100 hours. The service life of the polymer material, stainless steel, and ceramic is 400 hours. Rapid assembly of spray heads is recommended. A quick-assembled spray head is recommended. For example, QJ100 quick assembly joints, the nozzle cap and the sprayer body are connected, and the thread is changed to a bayonet to facilitate disassembly and assembly, especially when the spray head is clogged. , labor and safety. Disassembly and assembly requires only a slight twist of 1/4 turn; the seal uses a unique fluorinated rubber gasket, never drip; quick-fit joints can automatically ensure that the nozzle and the boom deflection angle, no need to adjust; with the spray bar connected square , Tube two kinds of chucks to choose from. The diameter of the pipe clamps is 13, 19, 25, 32 mm for the boom diameter, 19, 25, 32 mm for the width of the boom, and 9.5, 12.5, and 19 mm for the outer diameter of the hose coupling.