TIRE FREEZING PLANT Russian patent published in 2007 - IPC B29B17/00 F25D3/10 

FIELD: mechanical engineering; tire recycling.

SUBSTANCE: proposed tire freezing plant is designed for accelerated and deep freezing of tires of different types and sizes and similar large-size articles made of polysynthetic organic or link materials. As problem of recycling of tires, even those of passenger cars, appearing in fact simultaneously with self-propelled vehicles and getting into new millennium on wheels of vehicles uncountably multiplied practically in all civilized countries of the world becomes a global problem and not in the row of easy tasks of applied science which, unlike fundamental science solving global problems also at the cost of public expenses, there good grounds to believe that a bright idea of freezing of tires dawned upon a practicing engineer and not upon an elderly and eminent academician working in fundamental metallurgy who probably efficiency embodied in metal the method of recycling of tires by cutting, theoretical fundamentals of which being effectively laid from year to year to green managers or nouveau-riches at public expenses. However, despite of profundity and refinement of the statement, the colleague-practicing engineer, estimating the difference between rubber and metal "by touch" who proposed to transform vulcanized rubber from viscoelastic state into sufficiently brittle state with possibility of crushing and grinding the tires as standard home-made brick of dry-press molding and probably with blessing of the academic science, used known Dewar flask or made of freezing bath upon a model and pattern of said flask which required considerable consumption of liquid nitrogen as cooling agent being rather expensive on the home market, and "Dewar bath" being rather expensive article requiring special materials and technologies and, in sum with unexpected expenses, said bright idea of tire freezing can lose its attractiveness turning to be uncompetitive even with the traditional tire cutting technology, and tire recycling problem can move from row of "world" into "eternal" problems. Basing on all above stated and be guided by common sense and by own not always "sweet" experience and after hard work over fundamentals of heat-mass exchange, 1 have succeeded in designing the simplest thermos freezing plant including a liquid nitrogen bath made of low-carbon killed steel with curvature of the bottom exceeding radius of the tire dipped into liquid nitrogen to low level of tire seating holes with its lifting in bath to its upper level and the bottom of the housing enclosing the bath with clearance in between equal to thickness of heat insulating layer, for instance, made of foamed polyurethane or other highly effective polysynthetic heat insulation with subsequent rotation of tire at frequency of up to 1 c^-1.

EFFECT: reduced cost of tire recycling.

2 dwg