Abstract
The considered electric furnace with a mobile base is the most innovative power unit providing energy consumption of 48…52 mJ/m3during the process of vermiculite firing which has never been achieved before. New power unit was developed for all mechanical shortcomings of the test prototype were eliminated. By eliminating the resonating base plate and switching to the platform with forced excitation of its vibrations, the influence of fluctuations in the excitation frequency of the oscillatory system on its technological parameters, ensuring the duration of vermiculite heat treatment, has been eliminated. The activity of high sensitivity of the oscillations of the base platform to the change in friction, which appears during operation, is also completely removed. In addition, the problem of a controlled and regulated vibrational method of supplying raw materials to the furnace without the use of drum doses has been solved. It simplifies the design and cost of new power units, which are characterized by doubled productivity and dynamic balance.
Highlights
The research of technologies and equipment for expanded vermiculite production and products from it have been carried out from the 40s of the last century to the present, both in our country and abroad [1,2,3,4,5,6]
The oscillatory system of the coupled power unit consists of a base platform with the total mass of all its structural elements M and springs 11, which provides only return movement, and the excitation of the base platform oscillations is set by a shaft which is connected to the only drive motor in this design by means of bearings which are eccentrically placed on the shaft
Some disadvantages connected with dosing systems of vermiculite concentrates and expanded material movement in the firing space, forced to review some design features and significantly simplify them
Summary
The research of technologies and equipment for expanded vermiculite production and products from it have been carried out from the 40s of the last century to the present, both in our country and abroad [1,2,3,4,5,6]. The further development of new furnaces for that time during almost twelve years, including the use of so-called «zero» modules [7] and the use of advanced overhead heating systems [8], led to the achievement of the highest indicator of their efficiency – specific energy consumption of vermiculite firing depending on the used concentrate, equal to 170...182 mJ/m3. This reached the limit, and this concept did not allow move over it. The purpose of the research is to create the alternative mechanisms and processes for maintaining platform vibrations to implement the vibrotransport effect and dosing of vermiculite concentrate, as well as to analyze the design and dynamic characteristics of these new systems
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