Revealing changes in the technical parameters of the teat cup liners of milking machines during testing and production conditions

Keywords: teat cup liner, rubber parameters, operating time, service life, tensile force

Abstract

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 %

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Author Biographies

Andriy Paliy, Kharkiv Petro Vasylenko National Technical University of Agriculture

Department of Technical Systems and Animal Husbandry Technologies

Elchyn Aliiev, Dnipro State Agrarian and Economic University

Department of Mechanization of Production Processes in Animal Husbandry

Anatoliy Paliy, National Scientific Center «Institute of Experimental and Clinical Veterinary Medicine»

Laboratory of Veterinary Sanitation and Parasitology

Katerina Ishchenko, Kharkiv Petro Vasylenko National Technical University of Agriculture

Department of Technical Systems and Animal Husbandry Technologies

Igor Lukyanov, Kharkiv Petro Vasylenko National Technical University of Agriculture

Department of Equipment and Engineering of Processing and Food Production

Volodymyr Dobrovolsky, State Agrarian and Engineering University in Podilia

Department of Physiology, Biochemistry and Morphology

Oksana Yurchenko, Sumy National Agrarian University

Department of Construction Technology

Oleksandr Chekan, Sumy National Agrarian University

Department of Obstetrics and Surgery

Tetiana Dedilova, Kharkiv National Automobile and Highway University

Department of Economics and Entrepreneurship

Yurii Musiienko, Sumy National Agrarian University

Department of Obstetrics and Surgery

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Published
2021-11-18
How to Cite
Paliy, A., Aliiev, E., Paliy, A., Ishchenko, K., Lukyanov, I., Dobrovolsky, V., Yurchenko, O., Chekan, O., Dedilova, T., & Musiienko, Y. (2021). Revealing changes in the technical parameters of the teat cup liners of milking machines during testing and production conditions. EUREKA: Physics and Engineering, (6), 102-111. https://doi.org/10.21303/2461-4262.2021.002056
Section
Engineering

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