| 摘要 |
781,357. Mixing machines. GENERAL TIRE & RUBBER CO. Sept. 29, 1955 [Oct. 20, 1954], No. 27747/55. Class 86 Materials are homogenized and delivered in plastic form in apparatus comprising a feeding and plasticizing unit A and a homogenizing unit B, the latter unit having a rotary agitator provided with circumferential ribs 33 with rounded profiles, and a fixed casing member 25 provided with internal ribs 40 which project into the spaces between the ribs 33 of the agitator to form a tortuous passage- .way between the agitator and the casing member. Slots 51 inclined at an angle to the axis of the unit are formed in the ribs 33 and slots 52 extending parallel to the axis of the unit are formed in the ribs 40 to provide localized variations in the axial flow of material. The material is supplied to the unit A from a hopper and is fed horizontally by a feed screw with two helical flights. The diameter of the screw increases towards the forward end to subject the material to increasing compression, whereby it is delivered to the unit B in a plastic state. The ribs 33 of the agitator are on rings 32 which are keyed to, and clamped on, an extension 24 of the feed screw. The temperature of the material is controlled by circulation of fluid within the feed screw, which is hollow, and around casings surrounding the feed screw. |
