Milkmeter based on electric capacitive flow sensor
2021
Tkach, V., National Academy of Agrarian Sciences of Ukraine, Glevaha, Vasil'kivskij distr., Kiev reg. (Ukraine). National Research Centre “Inst. of Mechanization and Electrification of Agricultureˮ | Achkevych, V., National Univ. of Life and Environmental Sciences of Ukraine, Kiev (Ukraine) | Bratishko, V., National Univ. of Life and Environmental Sciences of Ukraine, Kiev (Ukraine) | Achkevych, O., National Univ. of Life and Environmental Sciences of Ukraine, Kiev (Ukraine)
The research concerns the creation of effective monitoring of the intensity of milk production and accounting for individual milk yield. The article presents the results of theoretical and experimental studies of a capacitive flow sensor and a milk meter. A mathematical model is developed, and dependences are obtained, which reveal the relationship between the signal of the capacitive flow sensor, its design parameters and the parameters of the pulsating milk flow (volume and flow speed). Within the conditions of this mathematical model, the result of calculating the milk does not depend on the characteristics of the capacitive flow sensor and the electrical properties of milk. Based on the obtained dependences, a signal processing algorithm and appropriate software for determining individual milk yield and milk flow through the milk supply hose of the milking machine have been developed. A prototype of a milk meter based on a capacitive flow sensor is made. Production inspection of the meter at the facilities with a stable milk pipeline and laboratory studies of its operation as part of the installation for milking cows were carried out. The average measurement error when milking low-yielding livestock in production conditions was 5.7%. During laboratory tests, a systematic deviation of the meter model readings to the smaller side was recorded, which is due to the use of the lower milk line to simulate the milking parlour. Control measurements in production conditions were carried out on two tie stall farms. Each farm had 100 animals. The total number of control milking was 30 repetitions. There is also a systematic dependence of meter readings on the intensity of the milk production. These systematic deviations are corrected by the introduction of a correction factor, which, when changing the intensity of milk production from 1.6 × 10−5 m**3•sE−1 to 6.6 × 10−5 m**3 •sE−1, changes from 1.2 to 1.7, respectively.
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