Abstract An apparatus for working up old tires by multi-stage comminution and sorting of the comminuted pieces on the basis of type and size comprising charging means for feeding whole old tires to a precomminuting unit and breaking down the tires into pieces of the size of approximately the palm of the hand, a conveyor means for feeding the pieces to a magnetic separator for removal of all steel-containing pieces, and a device for grinding the iron-free pieces. The latter device includes two grinding stages and is designed to separate the rubber from fiber components. The device receives the ground product and separates the rubber includes a separating means comprising a positively controlled vibrating screening device operating mechanically with relatively low frequency and having two or three screens a vibrating sorting device is arranged behind the screening device, and through the slightly ascending perforated screen bottoms of the screening device a stream of air is provided which fluidizes the material, the intensity of the stream of air being so adapted to a swinging movement of the screen that the lighter particles of textile fiber are caused to move in a direction opposite that of a heavier rubber granulate.
An apparatus for treating old rubber tires having carcasses of fiber material and steel, comprising: a first comminuting device for breaking up said tires into pieces; magnetic separator means for removing from the pieces produced by said device, those pieces containing steel; a first mill for comminuting the pieces passing said magnetic separator means and producing a coarse product; an attrition mill connected to said first mill for comminuting said coarse product and producing a fine product and releasing said fibers from the rubber; and means for separating said fine product into a first component consisting predominantly of said fibers and a second component substantially free from fibers and constituting a rubber granulate, said separating means including: at least one horizontal vibrating-sieve screening device having at least two horizontal sieve decks lying one above another, means for removing above the upper one of said decks at least part of said first component, means for removing a rubber granulate from below the upper one of said decks, and a sorting device receiving the rubber granulate removed from below the upper deck, said sorting device having a perforated surface inclined slightly to the horizontal and adapted to receive the rubber granulate removed from below said upper deck, means for oscillating said perforated surface, and means for passing a fluidizing gas stream upwardly through said perforated surface at a intensity related to the oscillation of said surface and sufficient to cause rubber particles to ascend on said surface and fiber particles to move in the opposite dirEction to said rubber particles.
Claim 2
Independent Claim
258 words
An apparatus for treating old rubber tires having carcasses of fiber material and steel, comprising: a first comminuting device for breaking up said tires into pieces; magnetic separator means for removing from the pieces produced by said device, those pieces containing steel; a first mill for comminuting the pieces passing said magnetic separator means and producing a coarse product; an attrition mill connected to said first mill for comminuting said coarse product and producing a fine product and releasing said fibers from the rubber; and means for separating said fine product into a first component consisting predominantly of said fibers and a second component substantially free from fibers and constituting a rubber granulate, said separating means including: at least one horizontal vibrating-sieve screening device having at least two horizontal sieve decks lying one above another, means for removing above the upper one of said decks at least part of said first component, means for removing a rubber granulate from below the upper one of said decks, and a sorting device receiving the rubber granulate removed from below the upper deck, said sorting device having a perforated surface inclined slightly to the horizontal and adapted to receive the rubber granulate removed from below said upper deck, means for oscillating said perforated surface, and means for passing a fluidizing gas stream upwardly through said perforated surface at a intensity related to the oscillation of said surface and sufficient to cause rubber particles to ascend on said surface and fiber particles to move in the opposite dirEction to said rubber particles.