Abstract. The foreign bodies located in the grain mass have physical and morphological properties that distinguish them from the basic culture, and which are used in manufacturing the separating equipment. The experts' attention has been drawn by the study of phenomena, which influence the process of separating impurities, aiming at a maximum reduction of impurities from the grain matter. Cereal and industrial plant seed pre-cleaning and cleaning, prior to their storage or processing, is a complex technological process that includes a multitude of constructive types for technical equipment designed to separate and remove existing impurities in the seed mass, which are based on various separation principles. Impurities in the seed mass are also different from the main crop seeds (grain seeds or industrial plants) in terms of aerodynamic properties. This paper presents some theoretical aspects regarding the separation of seed mixtures based on the aerodynamic principle (resistance of the seed mass layer to the passage of air, seed floating capacity, air stream working velocities, total air flow rate), which were the basis for the development of a new type of aeration cleaning separator SCA 5 for seed mixtures cleaning and sorting. The advantages of using this equipment in the process of precleaning/cleaning cereal and industrial plant seeds are also mentioned.

The present work is achieved based on the processing of the data accumulated over time, within the activity of research, technological engineering, and testing of machines for processing agricultural products in the last years, as well as studying the specialized literature with the latest achievements of some companies that make machinery for processing agricultural products. The compression of the hemp stalks for processing is analyzed, the main characteristics of the working rolls, the specific energy consumed are determined and an analysis of the obtained fiber length is performed. In order to develop a technical equipment for processing hemp stalks that ensures high performance, the following aspects were studied: the constructive and functional factors of a technical equipment that influence the working processes in order to choose a performance solution for processing hemp stalks. In the last part of the paper, the main technical and functional characteristics of a high-performance technical equipment for processing the hemp stalks harvested in green are established.

Biodiesel type fuel is widely used on a large scale in most of the European Union. Carbon dioxide is eliminated by combusting biodiesel, but not toxic emissions. Due to the more drastic European ecological demands to reduce the quantity of toxic emissions from automobiles, there is an increased interest to use biodiesel, because it is a bio-degradable and non-polluting fuel. Even by mixing diesel fuel with biodiesel in a percentage of 20%, the emission of toxic gases will be greatly reduced. Vegetable oils used as biofuels are obtained from oleaginous plant crops, without any prejudice to food security. The use of biodiesel can also bring benefits by prolonging the lifetime of diesel engines, ensuring a better lubrication. The paper presents a series of researches on obtaining vegetable oils from various oleaginous seeds (rapeseed, camelina, hemp) using a special installation for producing oils through cold pressing.

Finite element analysis (FEA) is a computerized method for predicting how a product reacts to realworld forces, vibration, heat, fluid flow, and other physical effects. Finite element analysis shows whether a product resists under the working conditions, wears out, or works the way it was designed. Hemp fibre is a natural renewable material used in important areas of industry. The primary processing is performed on special equipment that ensures hemp fibre processing. In this study, the structural analysis module will be used for static analysis (resistance checking) and modal analysis (frequency analysis or calculation of a number of structure's own frequencies) for the important assemblies. The pressing and crushing rollers, their spindles and bearings and the frame (machine frame) of the hemp fibre processing equipment are analyzed and verified constructively and functionally. The results obtained are used in redesigning the equipment. Thus, it is expected that the new design of the hemp fibre processing equipment will have better performance in terms of metal consumption, energy efficiency and the quality of the obtained products. The equipment comprises a system with 8 pairs of processing rolls, and a vibrating system for separating the pieces from the remaining stems in fibre. The work is aimed at checking the dimensioning and the resistance to the efforts by the method of the finite element analysis (FEA) both for the construction of the rollers and the support frame.

This paper describes the use of the method of selective, weighted morphological research by dividing by inventics submorphologies to analyze the equipment for biocompost production. The selective morphological research method was used to find the optimal constructive solution which is then developed in the research, design and testing of an innovative piece of equipment. Using Bellman's principle and the method of morphological analysis, the known constructive solutions will be studied, their weighting will be achieved by dividing by submorphologies and the Bellman diagram will be constructed to determine the weighting coefficient of the optimal solution.