Patent ID: 7344098
Filing Date: 2008-03-18
Classification: B29B,B29C,B29K,B29L,Y02W,Y10S

Abstract:
1. An apparatus for the manufacture of highly active rubber powders from scrap tires and waste of rubber articles, which apparatus comprises a cylindrical casing having a charging connection and a discharging connection, and within which casing are first and second size reducing crushing zones, wherein present through each of these zones is a compacting worm with a reduction in the depth of grooves between combs decreasing in a direction of the crushing zones, and an activator in the form of a rotating body, on whose outer working surface slots are formed, each of the compacting worm and the activator being mounted in rotary manner coaxial relative to an inner surface of the casing accompanied by the formation of an annular clearance with the casing's inner surface, and within the casing, the compacting worm and the activator being provided with cooling elements; and wherein the first size reducing crushing zone has a charging area, a compacting area and a first crushing area, and the compacting worm is a multistart compacting worm with an interturn gap volume decreasing in a direction of the discharge connection and the casing surrounding the discharge connection; wherein the casing's inner surface in the compacting area includes a conical opening inclined in a direction of the discharge connection and having 3 to 6 ribs with a rectangular cross-section engaging in the interior of the casing; wherein the first crushing zone the casing inner surface includes a cylindrical opening having a diameter which is 1.003 to 1.02 times larger than a diameter of the compacting worm, and the casing inner surface includes a starting cut pitch 0.5 to 1.5 times larger than a starting cut pitch of the compacting worm, wherein helical notches are present in multistart form with 3 to 50 starts and a constant depth in a straight and/or reverse direction and where a ratio of the of the compacting area and the first crushing area along a rotation axis of the worm is in the range 1:0.5 to 0.5:1; wherein said first and second size reducing crushing zones are formed on replaceable, detachable sleeves, which are mountable on a shaft or on the casing, and have on one side of each sleeve are working surfaces and on the other side of each sleeve are helical grooves with an increased surface area of walls of the sleeves for pumping a cooling medium; the second size reducing zone having a gas saturation area, a second crushing area, and a discharging area, and including an activator in the form of a rotating body and a discharge worm rigidly connected thereto and fitted in aligned manner with the compacting worm, as well as a cylindrical casing surrounding the activator and the compacting worm, while an outer surface of the activator includes a pitch which is 1.1 to 2.5 times greater than a starting cut pitch of the compacting worm, multistart helical notches with a constant depth in straight and reverse directions with the same pitch and the same number of starts, and on an outer surface of the discharge worm are multistart, helical combs in a straight direction with a pitch 1.15 to 3.0 times greater than the starting cut pitch of the compacting worm with an interturn gap increasing in the direction of the discharge connection, the helical combs being constructed continuously or are interrupted by helical notches in a reverse direction with a pitch equal to a starting cut pitch of the helical combs; the cylindrical casing inner surface surrounding the activator and a discharge worm includes multistart, helical notches constructed with a pitch of 0.5 to 1.5 times smaller than a starting cut pitch of notches on the activator and the combs of the discharge worm in the straight and reverse directions, the ratio of extensions of the activator and the discharge worm along their rotation axis being in the range of 0.2:1 to 1:0.3 of said working surfaces of the activator, the discharge worm and the casing on the replaceable sleeves being on one side of the sleeve, and on the other side of the sleeve are cut helical channels with an increased surface area of the sleeve walls for pumping the cooling medium, the multistart, helical notches being constructed with a semicircular profile with a radius which is 0.005 to 0.03 times the discharge worm diameter and a depth which is 5 to 15% smaller than the discharge worm radius, and the ratio of the number of notches in the straight and reverse directions being in the range of 0.3:1.0 to 1.0:0.3.