Revealing changes in the technical parameters of the teat cup liners of milking machines during testing and production conditions
Autor: | Elchyn Aliiev, K.V. Ishchenko, Yurii Musiienko, Volodymyr Dobrovolsky, Oksana Yurchenko, Anatoliy Paliy, Oleksandr Chekan, Andriy Paliy, Tetiana Dedilova, Igor Lukyanov |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Physics
QC1-999 tensile force General Engineering General Physics and Astronomy Toughening operating time Clamping rubber parameters Milking chemistry.chemical_compound Silicone chemistry Natural rubber teat cup liner visual_art Service life Ultimate tensile strength TJ1-1570 visual_art.visual_art_medium Milk flow Mechanical engineering and machinery Composite material service life Mathematics |
Zdroj: | EUREKA: Physics and Engineering, Iss 6, Pp 102-111 (2021) |
Popis: | To implement effective cow milking, it is necessary to take into account the peculiarities of the milk flow process, the milking machine's adaptability to perform the given technological functions. The aim of research is to establish changes in the design and technological parameters and physical and mechanical properties of teat cup liner of milking machines during its testing and in production conditions. The results obtained will make it possible to make a rational choice of rubber, ensure an efficient milking process during its service life. It is found that the tensile strength of silicone teat cup liner at the beginning of operation was 1.6 times higher than that of a rubber compound, and after 6 months. operation – 1.7 times. With respect to the relative elongation, this difference was 1.4 times, and after operating time – 1.3 times. Studies have proven that rubber during operation changes its physical and mechanical properties: the length of the active part increased by 3.1 mm; wall thickness – 0.2 mm. It is found that the most intensively elastic properties of teat cup liner changed during the first 10–20 days. After 10 days, the closing vacuum increased by 16.6 % compared to the initial one, and after 20 days by 23.3 %, which amounted to 8.57 and 9.06 kPa, respectively. Up to 420 hours of operation, the clamping vacuum reached 11.3 kPa, which is 5.8 % lower than the requirements for toughening teat cup liner for rejection. In general, over the period of experiments, the average value of the vacuum of closing the opposite walls of teat cup liner increased from 7.35 to 12.43 kPa, which is 3.6 % higher than the norm (12 kPa). As a result of experimental studies, the regularity of the rubber tension force depending on the operating time in the form of a fourth degree polynomial is obtained. It is found that after 150 hours of operation, the tensile force of teat cup liner decreased by 21 % |
Databáze: | OpenAIRE |
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