In this article, the authors discuss the results of experiments to determine the working bodies moving elements speeds ratio when harvesting watermelons or cabbage heads, having a shape close to a spherical body. It was revealed that the conveyor harvester for watermelons harvesting, equipped with an active roll-in machine, can jam the fruit between the conveyor belt and the roll-in belt, this leads to the fruit damage. To find the minimum allowable damage level (up to 5% according to the agrotechnical requirements), it is necessary that the roll-in tape is made of rubber cloth with a friction coefficient of fт = 0.48, with a ratio of speeds, the limits of change are from 1.0 to 1.3, fruit size is dmin= 15 cm, dmax = 30 cm.
This paper presents the results of research, an approximate model of the design of a rotary tool for combing weeds with loosening the soil, as well as its working bodies. The relevance of carrying out scientific research work is described, allowing to find the latest methods and means of increasing the efficiency of agricultural production in the cultivation of cultivated plants. A diagram of a laboratory sample of a rotary tool is presented, its design and workflow are described. The design and purpose of the main working units of the rotary tool for combing out weeds with loosening the soil has been substantiated.
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