Because of its simple structure, convenient use and low price, the knapsack sprayer is still an important plant protection medical device for farmers in rural areas, especially in mountainous areas. It is widely used in pest control of crops such as cotton, grain, fruit trees, vegetables and tobacco. However, farmers' friends often lack proper maintenance and repair techniques, resulting in many inconveniences in actual operations. The author combines years of practical experience, the correct use, maintenance and troubleshooting methods of the sprayer are as follows:
1, use and maintenance
1) When using, check whether there is air leakage at each joint. First install the clean water and then spray the drug and then apply the medicine.
2) The level of liquid added to the liquid cannot exceed the safe water level. Before spraying, first move the rocker more than 10 times to increase the pressure inside the barrel to the working pressure. The plate rocker should not be used excessively to prevent the air chamber from exploding.
3) After the work is completed, pour out the residual liquid in the bucket in time, and wash it with water to dry it. At the same time, check whether there is accumulated water in the gas chamber. If there is accumulated water, remove the water outlet to release the accumulated water.
4) When not in use for a short period of time, the main components should be cleaned, wiped and placed in a cool and dry place; if not used for a long time, the metal parts should be buttered to prevent rust.
2, failure and repair
1) The switch leaks. Wear of the switch gasket or wear of the switch asbestos wire can cause the switch to leak, and a new gasket or asbestos wire should be replaced.
2) The sprayer is left unused for a long time, and the switch will be turbid due to the liquid medicine, making the switch inflexible. The switch can be removed and put into kerosene to clean, erase the rust, apply a proper amount of lubricating oil, and tighten the switch cap.
3) The air chamber is not inflated, and the rocker is not pressed. It is caused by the hardening or cracking of the cup or the looseness of the nut at the bottom of the cup. The cup should be slightly pressed or replaced with a new cup, immersed in animal oil, lubricated and expanded, coated with a little oil, and tighten the bottom nut.
4) The fog is bad and the fog is not tapered. This may be caused by blockage of the nozzle of the nozzle, blockage of the filter in the casing, or the entry and exit of the water ball valve by dirt. The nozzle hole should be dredged to remove debris; if the casing is blocked, the casing cleaning filter should be disassembled, the ball valve should be inspected, and dirt should be removed.
5) The air chamber plug rod rises automatically and the top of the gland is watered. It is caused by cracks in the gas wall or the bottom of the gas chamber or the glass ball in the valve casing is blocked by debris, which cannot be caused by the tightness of the valve body or the damage of the cup. Use solder to repair cracks during maintenance, remove debris from the valve body, and change the cup.
6) The air chamber gland leaks or the water cover leaks. The reason is that the leather gasket is damaged or the flange is desoldered from the air chamber. The gasket or solder joints should be replaced.
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