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A mixing apparatus for mixing material in a mixing chamber (19) is provided. A rotor (21) is mounted on a shaft (15) which is both rotated and moved axially simultaneously. Motors (13) through gears (14,16) rotate shaft (15) and rotor (21)' and hydraulic cylinders (9) move the rotor (21) axially. Mo

A mixing apparatus for mixing material in a mixing chamber (19) is provided. A rotor (21) is mounted on a shaft (15) which is both rotated and moved axially simultaneously. Motors (13) through gears (14,16) rotate shaft (15) and rotor (21)' and hydraulic cylinders (9) move the rotor (21) axially. Motors (13), the gears (14,16), the rotor shaft (15), and the rotor (21) are all supported by carriages (11) which slide on horizontal rods (7). The rotor (21) has internal radial mixing slots (39). A rotor cleaning apparatus is provided which includes two separable collar parts (41, 41') having a plurality of cleaning prongs (43) in the form of a comb. The collar parts (41, 41') are supported by comb carriages (45, 45') which move the collar parts (41, 41') radially from a non-use position into cleaning position. When the rotor cleaning apparatus is in cleaning position, the cleaning prongs (43) are in alignment with the radial slots (39). Cleaning is effected when cleaning drive cylinders (35) move the rotor (21) into contact with the cleaning prongs (43). Wedges (53, 53') assist the alignment of radial slots (39) with the cleaning prongs (43). A positioning apparatus is affixed to the rotor shaft (15) for aligning the radial slots (39) of the rotor (21) with the cleaning prongs (43). The positioning apparatus includes a registration gear (31) which is moved by a detent element (49) projecting from a spring biased pawl (50) pivotally attached to a radially moving bar (52). When the detent (49) engages a tooth in registration gear (31), the radial slots (39) of rotor (21) are placed in alignment with the cleaning prongs (43) of the cleaning apparatus.

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1. A mixing apparatus for mixing material in a closed mixing chamber, comprising: a rotor mounted on a shaft, said rotor and shaft rotated by rotating driving means and moved axially by primary axial drive means, said rotor having internal passageways for passing the material being mixed therethr

1. A mixing apparatus for mixing material in a closed mixing chamber, comprising: a rotor mounted on a shaft, said rotor and shaft rotated by rotating driving means and moved axially by primary axial drive means, said rotor having internal passageways for passing the material being mixed therethrough; cleaning means normally located outside the mixing chamber and having cleaning fingers corresponding to said rotor passageways; and positioning means for aligning said rotor passageways with said cleaning fingers afer a mixing operation. 2. A mixing apparatus as described in claim 1, further comprising: auxiliary axial drive means for providing axial motion for cleaning the rotor. 3. A mixing apparatus for mixing material in a mixing chamber, comprising: a rotor mounted on a shaft, said rotor and shaft rotated by rotating driving means and moved axially by primary axial drive means, said rotor having internal passageways for passing the material being mixed therethrough; cleaning means having cleaning fingers corresponding to said rotor passageways; positioning means for aligning said rotor passageways with said cleaning fingers; and auxiliary axial drive means for providing axial motion for cleaning the rotor, wherein said auxiliary axial drive means is a hydraulic cylinder and piston, wherein said primary axial drive means is a hydraulic piston and cylinder, and wherein a common piston is shared by both said auxiliary axial drive means and said primary axial drive means. 4. A mixing apparatus as described in claims 1, 2, or 3, wherein said rotor passageways are radial slots. 5. A mixing apparatus as described in claims 1, 2, or 3, wherein said cleaning fingers are comb-like prongs. 6. A mixing apparatus as described in claim 3, wherein said cleaning means is comprised of two separable collar parts, separated from each other when not in use, and brought into a cleaning position in which they encircle said rotor shaft. 7. A mixing apparatus as described in claim 6, wherein said separated collar parts are supported by carriages and are moved together radially by collar part carriage driving means. 8. A mixing apparatus as described in claim 7, wherein at least one of said collar parts is provided with a wedge for engaging a radial passageway of said rotor when said collar parts have been moved toward said rotor shaft into the cleaning position. 9. A mixing apparatus for mixing material in a mixing chamber, comprising: a rotor mounted on a shaft, said rotor and shaft rotated by rotating driving means and moved axially by primary axial drive means, said rotor having internal passageways for passing the material being mixed therethrough; cleaning means having cleaning fingers corresponding to said rotor passageways; and positioning means for aligning said rotor passageways with said cleaning fingers; wherein said positioning means is comprised of: a registration gear located on said rotor shaft, said registration gear having an arrangement of teeth corresponding to the arrangement of rotor passageways; a detent member capable of being engaged with said registration gear; and a detent drive means for moving said detent member into engagement with said registration gear, whereby said rotor passageways are aligned with said cleaning fingers. 10. A mixing apparatus as described in claim 9, wherein said detent member is located on a pawl pivotally mounted on a rod capable of being driven back and forth by a rod drive means. 11. A mixing apparatus as described in claims 9 or 10, wherein said positioning means includes a stop means for limiting the motion of said pawl. 12. For a closed mixing apparatus having a rotor shaft with a mixing rotor with internal mixing passageways, a cleaning apparatus, comprising: a plurality of cleaning fingers normally located outside the mixing chamber; and a collar for supporting said cleaning fingers and for aligning said cleaning fingers with the rotor passageways after a mixing operation. 13. For a mixing apparatus having a rotor shaft with a mixing rotor with internal mixing passageways, a cleaning apparatus, comprising: a plurality of cleaning fingers; and a collar for supporting said cleaning fingers and for aligning said cleaning fingers with the rotor passageways, wherein said collar is comprised of two collar parts, said collar parts being separated from each other when mixing is underway, said collar parts brought into position in which they encircle the rotor shaft in the cleaning position. 14. A cleaning apparatus as described in claim 13, wherein said collar parts are located on carriages which move radially toward the rotor shaft thereby causing said collar parts to encircle the rotor shaft when said collar parts are in the cleaning position. 15. A cleaning apparatus as described in claims 13 or 14, wherein at least one of said collar parts is provided with a wedge for engaging a rotor passageway when said collar parts are in the cleaning position encircling the rotor shaft. 16. A rotary mixing and cleaning apparatus, comprising: a rotor with internal mixing passageways, said rotor rotating on an axis, said rotor located inside a mixing chamber during mixing; and a cleaning apparatus normally located outside the mixing chamber comprised of a plurality of cleaning fingers, said cleaning fingers being aligned with said rotor passageways, said rotor moved axially against said cleaning fingers for cleaning out said passageways of said rotor after a mixing operation. 17. A rotor mixing and cleaning apparatus, comprising: a rotor with internal mixing passageways, said rotor rotating on an axis; and a cleaning apparatus comprised of a plurality of cleaning fingers, said cleaning fingers being aligned with said rotor passageways, said rotor moved axially against said cleaning fingers for cleaning out said passageways of said rotor, wherein said plurality of cleaning fingers are affixed to two collar parts, said collar parts being separated from each other in a rest position when not in use, said collar parts brought together to encircle the rotor shaft when used for cleaning said rotor. 18. A rotary mixing and cleaning apparatus as described in claim 17, wherein said collar parts are located on carriages for moving said collar parts radially to encircle the rotor shaft. 19. A rotary mixing and cleaning apparatus as described in claims 17 or 18, wherein at least one of said collar parts has a wedge for engaging a rotor passageway when said collar parts are moved into the cleaning position encircling the rotor shaft. 20. An alignment apparatus for positioning a shaft mounted rotor having internal mixing passageways in alignment with cleaning elements of an apparatus for cleaning the passageways, comprising: a registration gear located on the rotor shaft, the teeth of said registration gear corresponding to the arrangement of the passageways in the rotor; a detent member capable of being engaged with said registration gear; and a drive member for moving said detent member into engagement with said registration gear, whereby the rotor passageways are positioned in alignment with the cleaning elements of the cleaning apparatus. 21. An apparatus for positioning a rotor as described in claim 20, wherein said detent member is located on a pawl pivotally mounted on a rod capable of being driven back and forth by drive means. 22. An apparatus for positioning a rotor as described in claim 21, wherein said pawl is movable by pawl drive means up to a stop means. 23. A mixing apparatus as described in claim 1 wherein said cleaning means is comprised of two separable collar parts, separated from each other when not in use, and brought into a cleaning position in which they encircle said rotor shaft. 24. A mixing apparatus as described in claim 23, wherein said separated collar parts are supported by carriages and are moved together radially by collar part carriage driving means. 25. A mixing apparatus as described in claim 24, wherein at least one of said collar parts is provided with a wedge for engaging a radial passageway of said rotor when said collar parts have been moved towards said rotor shaft into the cleaning position.