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The article reviews the problems of vibration stand development for vibration testing of technological devices with hydraulic power equipped with a switching device to create modes for tested products pre-scanning and to carry out resonance frequency tests. The proposed development will enhance the effect of such tests due to spectrally rich vibrational impact on tested products.

Results are presented from theoretical and experimental studies of modular-pouring electric furnaces. The process of the absorption of heat energy by vermiculite was examined and the optical-geometric parameters of the firing modules were determined. Efficient values were found for the temperature and duration of the firing of vermiculite concentrates. It is shown that the existing modular-pouring electric furnaces can be improved and new, energy-saving furnaces of this type can be developed.Products based on expanded vermiculite occupy an important place among the wide range of refractory materials that are made. They have good heat-insulating properties thanks to their porous layered structure, which allows them to be used to line different types of high-temperature equipment. Vermiculite is also an effective heat-insulating material and serves as a porous filler for lightweight concretes. It can be used to prepare dry mixes, including mixes with fireprotection properties. Vermiculite is employed in the acoustic insulation of buildings, the casting of steel, and other applications [1,2].The idea of creating a modular-pouring electric furnace for firing vermiculite was conceived in 2003 [2 -4], and refinements were made to the original concept during the ensuing decade of practical use of such furnaces. Improvements were made to the furnaces on the basis of results obtained not only from their operation but also studies of analytical models of their working processes.The goals of the studies were to analyze the process by which heat energy is absorbed by vermiculite, determine the optical-geometric parameters of the firing modules, find efficient temperature-time regimes for the firing operation, and determine the efficiency and unit energy content of the firing process.Modular-pouring electric furnaces can be used as a basis for the construction of small production units designed to obtain different fractions of high-quality expanded products from vermiculite concentrates (including concentrates that have already undergone preliminary beneficiation) and conglomerates with a high content of inert material [2]. Figure 1 shows a block diagram of the process of obtaining an expanded product from high-purity concentrates with a vermiculite content of 94 -96%. Charging the raw material into the furnace in different fractions makes it possible to obtain vermiculite of any desired granulometric composition. If

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