International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Oil rose production is a traditional branch in the economy of the Republic of Bulgaria and in production of rose oil the country is a world leader more than a century.

In the article the evolution and state of equipment used in oil rose growing are analyzed, the problems in the mechanization of technological operations are identified and the proposals are made for a mechanization of the only one fully rely on manual labor activity – the harvesting of rose petals.

The three-point linkage of Bulgarian middle power wheeled tractors "Bolgar" is equipped with a control system that allows only draft or positional control of mounted implement, which limits the effective use of tractors in the agricultural production.

The article presents results of a study on optimization of the parameters of a control system that provides mixed adjustment. Different variants of new develop lever mechanism which sums the control signals for draft and positional adjustment were analyzed and the most appropriate for practical realization was chosen. Experimental verification was carried out in field conditions, which confirmed the improved functional properties of the optimized design solution and appropriateness for implementation in agricultural practice