Patent EP-2110171-A1 (EP)
Inventor: VOSS KLAUS-W
IPC: B01F7/00
Filed: 2007-02-23
Abstract: The mixing device comprises an inlet opening (17a) for the supply of binder-component, inlet opening (17b) for the supply of curing-agent component and/or a discharge opening for mixing goods, a hollow cylinder like stator part (16) made of transparent material, a rotor part (17) rotatably received around a longitudinal axis (20), a mixing chamber arranged between the inlet opening and the outlet opening for mixing both components that are formed between the rotor and stator parts in ring column like manner. The mixing device comprises an inlet opening (17a) for the supply of binder-component, inlet opening (17b) for the supply of curing-agent component and/or a discharge opening for mixing goods, a hollow cylinder like stator part (16) made of transparent material, a rotor part (17) rotatably received around a longitudinal axis (20), a mixing chamber arranged between the inlet and outlet opening that are formed between the rotor and stator parts in ring column like manner. First mixing teeth received in the stator part radially towards interior and second mixing teeth received in the rotor part radially towards exterior extend in the mixing chamber to move the mixing teeth by a rotation movement of the rotor part in the stator part against each other and to create a mixture of the components. The stator part comprises two inlet openings connected with the chamber for the curing agent component. The first and second mixing teeth have a minimum length of 4 mm in a rotatable movement of the rotor part and for enlargement of the mixing chamber, so that the distance of the rotor from stator part in the inlet area of the components is 0.1 mm and the rotor part is warehoused in the stator part in its end area turned away the inlet openings. The rotor part comprises three radially running wing-like support elements at its end turned to the inlet opening in connection to the rotor part section bearing the mixing teeth. The length is measured so that the rotor part support itself the supporting element for fixing and centering the rotor part in the stator part at the interior wall area of the stator part. The stator and rotor parts consist of self-lubricating properties and the friction in the bearing area of the rotor part consists of polyoxymethylene. The stator part bears a ring-forming holder at its end turned away the inlet openings. The holder comprises a mounting break through that is detachably and rotatably connected with the stator part. The rotatability is limited by stops so that the fit of the inlet openings for the binder component and simultaneously a fit of the both inlet openings for the curing agent component with the inlet openings for the curing-agent component are reached. The holder consisting of plastic or metal comprises two opposite slit shaped break throughs running parallel to the rotating edge. Each break through comprises two guiding sections with different breadths from which the respective guiding section is formed for introducing a L-shaped guiding cam received at the lower rotating edge of the stator part. The width of the wider guidance section corresponds to the length of the freely winded shank. The narrower guiding section has a width that corresponds to the strength of the shank of the guiding cam received at the lower rotating edge of the stator part and running parallel to the longitudinal direction of the mixing device. The external wall area of the narrower guidance section comprises web like wall section with groove like reception under formation of tongue like edge area. The depth of the reception corresponds to the strength of the shank. The number of L-forming guiding ram is larger than two L-forming guiding rams. The first and second mixing teeth are arranged on a first and second mixing teeth plain and the mixing teeth plains are transferred axially in the direction of the longitudinal axis to each other so that the second mixing teeth of the rotor part radially rotates in the respective intermediate area of the first mixing teeth of the stator part. The mixing teeth have front side surfaces that are facing to each other in axial direction to position against each other in axially causing power between the stator part and the rotor part and are inclined in reference to a plain arranged normally to the rotation axis under an angle so that the front surfaces glide off to each other during the mixing process without the material wears out from the mixing teeth and arrives into the mixing goods. The inlet openings end directly in the mixing chamber. The inlet opening for the supply of the curing agent component is doubly arranged to create a redundant supply of the mixing goods with the curing agent component. The rotor part comprises a projection, which passes into the inlet openings for the supply of the binder component and rotates with the rotation of the rotor part to reduce the thixotropy of the binder component already in the supply channel of the inlet opening. The rotor part comprises an end side open, hollow cylinder like reception in which a core is insertable in geometrically passed manner by which the rotor part is drivable. The reception comprises a break rib running from the body of the rotor part radially towards interior. The break rib locks in corresponding notch in the core to transfer the drive rotatable movement for operating the mixing device from the rotatably driven core to the rotor part. The rotor part comprises seal lips to seal the mixing chamber between the rotor and stator parts and to prevent emerging of the mixing goods, and a cylindrical shaped bearing section to create a plain bearing arrangement in the stator part. The stator part comprises disk shaped profiles at an external circumference. The profile comprises a crescent snap contours in which a pin element grips during inserting the mixing device to secure the radial position of the discharge opening in the stator part, which has a support bearing area on which the rotor part adjoins and glides off with the mixing teeth to create an axial plain bearing arrangement. A hollow area is formed between the seal lips to enable a catching of mixing goods through the seal lips. An independent claim is included for a method for mixing of binder and curing-agent component under use of a mixing device.