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Experimental studies of duration of air pumping out from the "TEAT CUP - PULSATOR" system

Adamchuk V., Dmytriv V., Dmytriv I.

ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes

2015

Vol. 4, No 4

3--6

The article analyzes the results of experimental studies of duration of air pumping out from chambers of the variable vacuum-gauge pressure in the "teat cup - pulsator"system. The study of impact of structurally-technological parameters of milking units on the process of milk ejection and time characteristics of the operating mode was analyzed. The methods of conducting experimental studies of transitive time characteristics of pulsator operating modes based on differentiated study of transitive processes by high-frequency scanning of vacuum-gauge pressure changes while pumping air out from the "teat cup-pulsator" system are given. Results of the study of impact of vacuum pressure and the overflow hole diameter on the duration of air pumping out from chambers of the variable vacuum-gauge pressure system are provided. Results of experimental data are compared with theoretical ones. The analysis of results of experimental studies showed that the pulsator overflow hole diameter has the greatest effect on the duration of air pumping. By reducing the diameter, the duration of air pumping increases nonlinearly. Due to results of comparison of theoretical and experimental studies it was found the deviation of experimental data from the theoretical modeling of the duration of air pumping out from chambers of the variable vacuum-gauge pressure in the"teat cup - pulsator"system. The coefficient of coordination of theoretical dependencies on experimental data to calculate the duration of air pumping was calculated. The analysis of the obtained dependencies of the duration of air pumping out from the system "teat cup - pulsator"system allowed to recommend the most rational options of the pneumatic and electromagnetic pulsator, provided that it will be provision of the mode of smooth shockless opening of milking cup teat rubber at 48 kPa vacuum pressure and the volume of variable vacuum-gauge pressure chambers of the system "teat cup - pulsator" 10-4 m3.

Theory of the ploughing mechanism of the sugar beet combine harvester

Bulgakov V., Adamchuk V., Gutcol T.

Agricultural Engineering

2014

Vol. 18, No. 4

23--44

Forces acting on the sugar beet combine plough are caused not only by physical properties of soil (e.g. its compactness) but also by physical properties of the harvested crop (i.e. sugar beets). A current theory on rooting out sugar beets has included only physical properties of soil along with physical and geometrical parameters of the ploughing mechanism. The article presents a mathematical model of mechanical influence of the soil layer together with the mass of sugar beets roots on the beets ploughing element. Mathematical formulas of the developed theory were verified with exemplary calculations for the accepted working parameters of the sugar beets harvesting combine (inter alia working speed, working depth).

Siły oddziałujące na wyorywacz kombajnu do zbioru buraków cukrowych wymuszane są nie tylko fizycznymi właściwościami gleby (np. jej zwięzłością), ale także fizycznymi właściwościami zbieranego plonu (tj. buraków cukrowych). Dotychczasowa teoria wyrywania buraków cukrowych uwzględniała tylko właściwości fizyczne gleby, w powiązaniu z fizycznymi i geometrycznymi parametrami mechanizmu wyorującego. Artykuł prezentuje matematyczny model mechanicznego oddziaływania warstwy gleby, łącznie z masą korzeni buraków cukrowych na element wyorujący buraki. Formuły matematyczne opracowanej teorii zostały weryfikowane przykładowymi obliczeniami, dla przyjętych parametrów roboczych kombajnu do zbioru buraków cukrowych (m.in. prędkością roboczą, głębokością roboczą).