UDC 637.116
DOI 10.36461/NP.2024.72.4.025

THEORETICAL STUDY OF DEFORMATIONS OF THE NIPPLE TUBE OF A MILKING MACHINE
A.V. Yashin, Candidate of Engineering Sciences, Associate Professor; V.D. Badov, post-graduate student;
Yu.V. Polyvyany, Candidate of Engineering Sciences, Associate Professor;
A.N. Kalabushev, Candidate of Engineering Sciences, Associate Professor
Penza State Agrarian University, Penza, Russia,
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The article considers the need to organize an accommodating mode of operation of the milking machine, taking into account the effects of the calf's mouth or the milker's hand, in order to increase the intensity of milking by increasing the effectiveness of milking stimuli and improving the method of milk extraction from the udder by converting the "compression" cycle into the "compression with squeezing" cycle. For this purpose, the nipple tube is considered as one of the key elements of the milking machine, which directly interacts with the animal and performs the function of an executive mechanism. In this case, the nipple tube of the milking machinewas assumed to be an axisymmetric membrane of rotation. An instantaneous theory of strength calculation of thin membranes was applied and a linear inhomogeneous fourth-order differential equation with constant coefficients was obtained, as a result of which the equation of linear deformations was determined. This equation made it possible to determine the deflection of the symmetrical working part of the nipple tube depending on the dynamic and design parameters, the technical elastic constants of the material used, as well as coefficients with exponential, cosine and sinusoidal components for the height of the working part of the nipple tube. It was proposed to reduce the thickness of the working part of the nipple tube at the junction with the teat cup. It helped to increase the intensity of milking, which will form a consistent wave motion of the symmetrical radial deflection of the working part from the teat cup to the outlet of the nipple tube thus squeezing an additional portion of milk from the nipple section of the udder tank during the "compression" cycle, converting it into a "compression with squeezing." It was found that with a decrease in the thickness of the working part of the nipple tube in the range between 0.0018 and 0.0012 m, a decrease in the wavelength of its deflection in the range between 0.025 and 0.02 m was observed, which ensured the conversion of the "compression" cycle into the "compression with squeezing" cycle.
Keywords: stress, deformation, deflection, nipple tube, wavelength.

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