At the Novosibirsk affiliate of the Moscow Light-lndustry Technological Institute, in cooperation with the Institute of Mining, Siberian Branch of the Academy of Sciences of the USSR, a series of constructions was developed for pne,r,~tic vibration inducers with reverserotary action, which provide an opportunity for obtaining torsional, direct, torsional-direct, spatial, symmetric, and asy~mnetric vibrations and which can be widely used to accomplish technological process in the mining industry, construction, and machinery construction.
An experimental test of the correlation between thermal loss power and air flow speed in the near-face zone during trial runs of a PK-8ETM mining combine indicated a good match between experimental and calculated results (at least 80%).An analysis of the relationship (see Fig. 4) made it possible to determine the region of optimal air flow speeds (Fig. 5) and the minimal energy loss for various breakage regimes (Fig. 6).These are the main factors in the choice of air circulation conditions in the near-face zone to optimize energy transfer between IRS and the face. The method helps reduce energy loss by some 20%, improving ET and ETM productivity by a factor of 1.2-1.5. A methodology of calculating the electrothermal characteristics of a tunneling combine has been developed; it has been used in the design of the working element for a prototype Yasinov Tets-2ETM tunneling machine.
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