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Preliminary survey OF THE MASTER'S WORK
Tischenko Artem Sergeevich
Theme of master's degree work:
“Development of calculation bases of disintegrator-amalgamator stirring rod for sintering mix”
Leader of work: the senior lecturer of faculty " MOZCHM " Sidorov Vladimir Anatolyevich
RUS ENG
In my master's degree work I am engaged in a research of the device capable to considerably improve a quality of burdening of materials preparation to sintering. They are the devices allowing to replace rather out-of-date and conservative methods of crushing and mixing aggloburden with completely new, almost not investigated method. The are the mechanisms with flexible working elements.
Problem. The main problem concerning the implementation of the mentioned mechanisms in manufacture is absence of a precise design procedure that does not allow to vary in technological parameters and make a design optimization if necessary. One of mechanism pattern with flexible working elements is the desintegrator-amalgamator developed at the department of ore-termal processes and low-waste technologies of Donetsk national technical university. I also take part in its research.
The analysis of publications. Serious theoretical researches concerning the mechanism of the disintegrator-amalgamator it has not been carried out. There were only experimental-industrial tests at agglofactories of metal works for the name of Dzerzhinsky, metal works Ilyicha and ÅÌÇ with the purpose of revealing the most rational arrangement of the unit in a technological sintering mix stream and receptions of experimental data about burden parameters (fineness, loosening degrees and hashing) after its processing in the disintegrator-amalgamator.
As a result of tests the following conclusions have been made, that for the sintering mix homogenization improvement it is useful to install the mechanism in a technological stream either after reception bunkers, or the ambassador burdening separation. All experiments on disintegrator-amalgamator inclusion into work were accompanied by burden quality assurance after its processing. In both cases homogenization of all sintering mix is more preferable, than at earlier processing. Burden quality after processing with such technology has improved: large slag clot and lime have been crushed, granules fineness was reduced up to 10 mm, with the exception non-grinded agglo-ore pieces. All burden has been properly loosened.
Statement of the main task. The purpose in given master's work is the development of a design procedure of the mechanism of the disintegrator-amalgamator, as the data received earlier have been based only on experimental-industrial tests. Design procedure of the mechanism (calculation of geometrical parameters and capacity of a drive, productivity and the loadings arising at work, etc.) will allow to improve the use of its available resources and to optimize the design. It will lead to the results improvement of burden processing will allow to increase essentially the prepared ferriferous waste products charge in sintering mix, including stored sludge, without agglomerate deterioration and productivity agglomachines decrease. Thus ecological safety of sintering manufactures will essentially increase.
Optimization of a design is necessary to carry out, first of all, basing on productivity. What is necessary for its increase: whether to increase frequency of rotation, whether to replace a material of circuits, whether to change geometrical parameters of the mechanism? To answer these questions is possible only having analysed advantages and lacks of a design.
The basic features and advantages of mechanisms with flexible working elements:
1. A long operating mode.
2. Free passage of not destroyed pieces of a material during the mechanism functioning without damaging the working body.
3. Free passage of materials through the unit at its stop as flexible working bodies do not interfere with its passage.
4. Simplicity and relative cheapness of a design.
5. High efficiency of the unit.
The earlier designed mechanisms introduced into manufacture mainly carried out functions only loosening or grinding of material. Crushing of a material along with loosening was not possible owing to many factors: lacks of a design, mistakes of precalculations or simple unwillingness of designers to work in the given direction.With the invention of the disintegrator-amalgamator, many problems connected with loosening and crushing of sintering mix are solved, as it realizes all set forth above functions in common, and the result of processing of a material allows to hope, that the given design can have a wide spectrum of application in limits agglofactories any metallurgical works.
However absence of a design procedure of the mechanism at the given stage does not allow to introduce indoubtedly rational idea during a life everywhere. Without exact and, the most important, confirmed experimentally, calculations the future of mechanisms with flexible working elements foggy.
Some enterprises to put do not begin simply in a technological stream the mechanism (how it is progressive and high-efficient), not having theoretical acknowledgement of its work in a design procedure. And to change any technological parameters in a stream in which the mechanism is established, it will be extremely dangerous, as it will be impossible to predict, as will lead itself thus the new invention. That is why so the design procedure is important. Having received it, it will be possible to adjust not only behaviour of the mechanism during work, but also on available given to optimize a design what is important in highly developing technological decisions.
Possible ways of the problem decision:
1. Development of a design procedure should be based on the main law of any designer respecting: at the minimal expenses of monetary and material resources to receive the mechanism with the maximal productivity.
2. Also achieving approaches to a design procedure it is necessary to remember character of interaction of circuits (working bodies) with a material. It is necessary to understand their stability during work, at what frequency of rotation it the best.
3. Finding approaches to a design procedure of the mechanism, we should not forget that the loadings arises during work, influence all elements of the mechanism, and not just on flexible working bodies. Having determined their loadings we can make out assurance factor of a design and draw corresponding conclusions (in the sense of possible optimization of the mechanism).
4. Definition of parameters of start, braking and a stop also influence development of a design procedure,as we know, that at these processes the mechanism behaves inadequately, exceeding nominal parameters in some times.