INTENSIFYING THE PROCESS OF CLEANING PARTS IN SUBMERSIBLE WASHING MACHINES

An analysis of the working conditions of agricultural machinery showed that the main contaminants of parts include a combination of soil residues with plant and other organic materials and a mixture of petroleum products of various origins. To identify the most efficient and cost-effective mode for cleaning parts, the authors conducted an experiment that takes into account three factors: the duration of washing, the temperature of the washing solution, and the concentration of the aqueous solution of detergent components. The optimization criterion is the amount of washed out contamination. The authors designed a matrix for the implementation of the full-factorial experiment plan. Samples in the form of a square tube with a size of 50 x 50 mm and a length of 50 mm were cleaned using a submersible washing machine in the form of a small-sized ultrasonic bath Specos V-100. A solution consisting of sodium carbonate and a mixture of surfactants in a ratio of 9:1 was used as a detergent. The modes of ultrasonic cleaning were changed in accordance with the variation of three factors: cleaning duration - from 5 to 15 minutes, washing solution temperature - from 40 to 80°C; concentration of the aqueous solution of detergent components - from 5 to 25 g/l. The reproducibility of the experimental results was confirmed using the Cochran test. The significance of the regression coefficients was determined using Student's t-test. The model was validated using the Fisher criterion. Based on the regression equation, the authors determined response surfaces, in which the dependences are extremely close to linear. It is concluded that with washing duration of 12 minutes, a washing solution temperature of 70°С, and a concentration of the aqueous solution of detergent components of 20 g/l, the amount of washed out contamination is maximum.

ultrasonic cleaning, efficiency, intensification, criteria, optimization, cleaning, pollution, response surface