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Polyurethane Primer Coatings Polyurethol tested in these solutions for 14 months. Coatings Polyurethol containing a hardener retained good adhesion to St3 steel. Coatings Polyurethol without hardener lost adhesion in solutions of potassium chloride, borofoska, diammofoska and nitrophoska. The effect of a borofoska solution on the electrical conductivity (from 1 nA) and resistance (up to 10 GΩ) of Polyurethol and Raptor coatings was studied using the IKS-1 measuring kit. Coatings were applied by spraying and brushing, in one and several coats, with and without hardener. The electrical resistance of a two-layer coating of Polyurethol was 130 MΩ, a single-layer coating was 17 MΩ after a year of atmospheric testing. The electrical resistance of the Raptor coating in three layers with a thickness of 300 microns decreased from 130 to 22 MΩ after 200 days of testing in a solution of borofoska. The insulating power of 1 coat of Polyurethol when applied by spray is equal to the insulating power of 2 coats of Raptor when applied by brush. It has been established that polyurethane coatings Polyurethol and Raptor are suitable for anticorrosion protection of low-carbon steels from the action of mineral fertilizer solutions. The insulating power of 1 coat of Polyurethol when applied by spray is equal to the insulating power of 2 coats of Raptor when applied by brush. It was established that polyurethane coatings Polyurethol and Raptor are suitable for anticorrosion protection of low-carbon steels from the action of mineral fertilizer solutions.

Tractor domestic generator G1000V was chosen as a mobile power source for heating viscous protective materials during conservation of agricultural machines. Generator drive from tractor PTO with the reverse rotation of the shaft to the left negatively affects the ventilation and cooling of its body, and leads to a decrease in power. Studies of the thermal mode of operation of the generator under a load of 620 W showed that during normal (right) rotation of the fan wheel, the generator housing heats up by 10 °C. The wheel casing heats up to 60 °C during reverse (left) rotation, and the power is reduced by 4%. P The cooling efficiency of the generator with radial blades is practically the same as cooling with forward inclined blades in reverse application. Changes in the configuration and parameters of the impeller with radial blades are made in reverse application to improve the cooling of the G1000V generator housing. Cutting the wheel ribs by 1/3 of the height and the protrusions on the periphery of the flange with the blades bent by 20° to the left made it possible to reduce the generator heating temperature by 13°C. The backward bending of the ends of the radial blades at an angle of 40-45° to the radius of the wheel contributed to a decrease in the temperature of the generator housing by 18°C. The parameters of the rational configuration of the fan wheel for the G1000V generator were obtained as a result of the research. The use of such a wheel provided a 2.8-fold reduction in the thermal load on the generator during reverse use on a mounted conservation unit.

Ejector pneumatic pistols such as the GAV-167 and Voylet PS-5 used for the application of anticorrosive materials with large fillers. Pneumatic pistols have a receiving chamber for material input, an ejector with an air nozzle, a mixing chamber and a spray nozzle. When compressed air supplied through the ejector, a vacuum created in the receiving chamber. The research found that the vacuum pressure in the receiving chamber increased with an increase in the spray pressure, the size of the spray nozzle and a decrease in the length of the receiving chamber. The process of spraying technical liquids with a conditional viscosity from 11 to 80 seconds according to the VZ-4 viscometer has studied. The low quality of liquid spraying of the GAV-167 pneumatic pistol was noted. The liquid consumption when sprayed with a Voylet PS-5 pneumatic pistol depended on the length of the receiving chamber. With an increase in the length of the chamber from the minimum to the maximum, the consumption increased by 2 times. It proposed to set the maximum length of the receiving chamber for spraying low-viscosity material. To spray viscous material, it is necessary to set the minimum length of the chamber. Observations showed that the degree of dispersion of the material was higher at the minimum length of the receiving chamber. The Voylet PS-5 pneumatic pistol has upgraded to force the supply of material through a hose from a pressure tank. A flexible nozzle and extension have developed for applying anticorrosive material to hard-to-reach surfaces of machines.

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