Patents Assigned to Draiswerke GmbH
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Patent number: 6565023Abstract: An apparatus for comminuting, grinding and dispersing flowable grinding stock has a grinding receptacle with an inner, first grinding surface, which is rotationally symmetrical relative to an axis of rotation, and is drivable to rotate about the axis of rotation. Also provided is a grinding roller, which has a second grinding surface that is rotationally symmetrical relative to a central longitudinal axis, and is drivable to rotate about the axis. A grinding gap is defined between the first grinding surface and the second grinding surface.Type: GrantFiled: March 27, 2001Date of Patent: May 20, 2003Assignee: Draiswerke GmbHInventor: Philipp Schmitt
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Patent number: 6460791Abstract: An agitator mill with a grinding receptacle comprises a grinding chamber defined by an inner wall thereof and a rotor which is located therein and driven in high-speed actuation. Mounted on the rotor are agitator elements which stand out radially and to which are allocated counterpart elements mounted on the inner wall. A grinding-stock inlet is provided on an end of the grinding chamber and a grinding-stock outlet is provided on the other end of the grinding chamber, comprising an auxiliary-grinding-body separating device for the auxiliary grinding bodies in the grinding chamber to be held back. The distance of agitator elements and counterpart elements which adjoin each other decreases from the grinding-stock inlet towards the auxiliary-grinding-body separating device.Type: GrantFiled: March 9, 2001Date of Patent: October 8, 2002Assignee: Draiswerke GmbHInventor: Norbert Stehr
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Patent number: 6260779Abstract: An agitator mill comprises a cylindrical grinding receptacle, in which is disposed an agitator to be driven in rotation. At one end a grinding-stock supply line opens into the grinding chamber. At the other end a grinding-stock discharge line discharges therefrom. An auxiliary-grinding-body return line is provided, which discharges from the grinding chamber in an area of high local pressure and opens into the grinding chamber in an area of low local pressure, namely separate from the grinding-stock supply line.Type: GrantFiled: August 26, 1999Date of Patent: July 17, 2001Assignee: Draiswerke GmbHInventors: Horst Gross, Wendelin Kneisl
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Patent number: 6021969Abstract: An agitator mill comprises an annular cylindrical exterior grinding chamber, which is defmed by an inner wall of a grinding receptacle and an outer wall of a rotor and an interior grinding chamber, which is defined by an inner wall of the rotor and an outer jacket of an interior stator. The grinding chambers are interconnected by a deflection chamber. Allocated to the interior stator is a separating device which comprises inner annular disks rotatingly drivably coupled with the rotor and outer annular disks non-rotarily connected to the interior stator.Type: GrantFiled: April 27, 1999Date of Patent: February 8, 2000Assignee: Draiswerke GmbHInventors: Philipp Schmitt, Norbert Stehr
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Patent number: 5996914Abstract: An agitator mill comprises an annular cylindrical exterior grinding chamber, which is defined by an interior wall of a grinding receptacle and an outer wall of a rotor, and an interior grinding chamber, which is defined by an inner wall of the rotor and an outer jacket of an interior stator. The grinding chambers are connected with each other by a deflection chamber. An annular cylindrical eddy gap, which is defined by the rotor and the interior wall of the grinding receptacle and into which open the bypasses, is formed between a grinding stock supply chamber, which is disposed up-stream of the exterior grinding chamber, and the exterior grinding chamber.Type: GrantFiled: November 3, 1998Date of Patent: December 7, 1999Assignee: Draiswerke GmbHInventor: Norbert Stehr
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Patent number: 5950943Abstract: An agitator mill comprises an annular cylindrical exterior grinding chamber, which is defined by an interior wall of a grinding receptacle and an outer wall of a rotor, and an interior grinding chamber, which is defined by an inner wall of the rotor and an outer jacket of an interior stator. The grinding chambers are connected with each other by a deflection chamber. The walls defining the grinding chambers are smooth, free from agitator elements.Type: GrantFiled: August 5, 1997Date of Patent: September 14, 1999Assignee: Draiswerke GmbHInventor: Norbert Stehr
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Patent number: 5897068Abstract: An agitator mill comprises an annular cylindrical exterior grinding chamber, which is defined by an interior wall of a grinding receptacle and an outer wall of a rotor, and an interior grinding chamber, which is defined by an inner wall of the rotor and an outer jacket of an interior stator. The grinding chambers are connected with each other by a deflection chamber. The exterior grinding chamber is equipped with agitator elements, whereas the interior grinding chamber is smooth-walled, free from agitator elements. The cross-sectional surface of the exterior grinding chamber considerably exceeds the cross-sectional surface of the interior grinding chamber.Type: GrantFiled: October 15, 1998Date of Patent: April 27, 1999Assignee: Draiswerke GmbHInventor: Norbert Stehr
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Patent number: 5758833Abstract: An agitator mill comprises a grinding receptacle with a cylindrical inside wall which is free from any openings whatsoever. All the openings needed for operation, in particular a separating device joined to a grinding-stock discharge line and, if required, a refill opening for auxiliary grinding bodies, are disposed in a bottom which is releasably connected with the grinding receptacle.Type: GrantFiled: August 26, 1996Date of Patent: June 2, 1998Assignee: Draiswerke GmbHInventor: Hans Kabbe
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Patent number: 5634715Abstract: An installation for the mixing of a given quantity of liquid with a given quantity of powdery solid matter comprises a storage tank for the liquid and a mixing device having an inlet hopper. A liquid supply conduit, coming from the storage tank, and a solid matter proportioning device open into the inlet hopper. The supply capacity of the proportioning device and the throughput of the mixer are adjustable in such a way that the given quantity of solid matter is added to the liquid by several circulations of the liquid through the mixer.Type: GrantFiled: March 4, 1996Date of Patent: June 3, 1997Assignee: Draiswerke GmbHInventors: Norbert Stehr, Dieter Marz
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Patent number: 5335867Abstract: An agitator mill for treating free-flowing grinding stock comprises a discharge device, which is provided with a separating device to be disposed in the grinding chamber. In the separating device a mixing device is arranged, which comprises a mixing body movable in longitudinal direction of the cylindrical separating device.Type: GrantFiled: July 9, 1992Date of Patent: August 9, 1994Assignee: Draiswerke GmbHInventors: Norbert Stehr, Philipp Schmitt
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Patent number: 5133508Abstract: An agitator mill has an in each case annular cylindrical exterior grinding chamber and an interior grinding chamber, which are delimitated from each other by a cup-shaped agitator element, the interior grinding chamber and the exterior grinding chamber being connected with each other by bypasses formed in the agitator element for the return of auxiliary grinding bodies. In order to improve the grinding result and to increase the lifetime of the auxiliary grinding bodies or to be able to use even smaller auxiliary grinding bodies without their reaching a separator device arranged ahead of a grinding stock exit, carriers are arranged in the area of the bypasses at the inner casing of the agitator element and extend over a substantial part of the radial width of the interior grinding chamber and into it.Type: GrantFiled: January 30, 1991Date of Patent: July 28, 1992Assignee: Draiswerke GmbHInventors: Norbert Stehr, Philipp Schmitt
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Patent number: 5062577Abstract: An agitator mill for the treatment of flowable grinding stock has a grinding receptacle (3) with a mostly closed grinding chamber (9) and a rotatingly drivable agitator element (21) disposed therein. An interior stator (24) is disposed in the agitator element. A grinding stock supply chamber (53) is placed ahead of the grinding chamber. On the same side of the grinding receptacle (3) a separator device (34) is provided through which the grinding stock is discharged again after treatment. In order to prevent to a large extent wear on the separator device (34) and, at the same time, to achieve as even as possible a distribution of the grinding bodies in the grinding chamber (9), the agitator element (21) is designed approximately cup-shaped and disposed between the interior stator (24) and the wall of the grinding receptacle (3) with the formation of an exterior grinding chamber (9') and an interior grinding chamber (9").Type: GrantFiled: November 6, 1989Date of Patent: November 5, 1991Assignee: Draiswerke GmbHInventors: Philipp Schmitt, Norbert Stehr
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Patent number: 5018673Abstract: In an annular mixer for the wetting of solid matter, in particular for the wetting of fibrous material with a binding agent, a plurality of cutting devices are provided, downstream of a wetting zone and a subsequent secondary mixing zone and upstream of an outlet, in a radial plane relative to the shaft, for the reliable separation of clusters.Type: GrantFiled: November 20, 1989Date of Patent: May 28, 1991Assignee: Draiswerke GmbHInventors: Paul Eirich, Werner Christen
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Process for gluing wood chips and the like with liquid glue and apparatus for performing the process
Patent number: 4862826Abstract: In an apparatus for the continuous gluing of wood chips and the like with liquid glue, the chips are raised from a longitudinally moved chip bed and are returned into the same in free fall in the form of chip mists. The glue is exclusively supplied to the chips by pressure atomization by means of a plurality of pressure atomizing nozzles.In order to achieve good gluing quality with limited mixer dirtying and easy operation, glue distribution takes place in the chip mists substantially over the entire length of the chip bed and alternately at least one nozzle is closed, while at least one nozzle is open.Type: GrantFiled: October 2, 1985Date of Patent: September 5, 1989Assignee: Draiswerke GmbHInventor: Werner Christen -
Patent number: 4848919Abstract: A pinned mill for a mixer having a mixing mechanism has a motor outside the mixer container and a rotor inside the container and spaced apart from its walls. The rotor is rotationally drivable by the motor and is at least partly surrounded at a tangent by a stator having pins arranged concentrically with the rotor axis, the rotor being arranged inside the pins. The rotor is provided with elements defining a grinding gap with respect to the pins. In order to improved the grind performance without notably increasing the drive power, the rotor elements defining the grinding gap with respect to the stator pins are embodied only by vanes extending approximately radially to the rotor axis. The radially outer ends of the vanes have a cutting edge. The stator pins have an edge associated with the radially outer vane edges. The rotor is also embodied as substantialy open, inside the stator.Type: GrantFiled: April 25, 1986Date of Patent: July 18, 1989Assignee: Draiswerke GmbHInventors: Eberhard Lipp, Hans Wetzel
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Patent number: 4848676Abstract: An apparatus for regulating an agitator mill for comminution, deagglomeration and dispersion of grinding stock present in the form of a suspension is provided. To attain a constantly uniform grinding stock fineness, a device is provided for keeping the specific energy input constant, the specific energy input being determined by the quotient of the power introduced into the grinding stock and the grinding stock mass flow. A device is also provided for detecting the distribution of the auxiliary grinding bodies in the grinding chamber. The distribution of the auxiliary grinding bodies can be determined by detecting the pressure drop in the grinding chamber. Further, the distribution of the auxiliary grinding bodies can be detected by means of at least two partial cooling chambers connected parallel to one another, with individual heat flows being detected via the partial cooling chambers.Type: GrantFiled: September 15, 1988Date of Patent: July 18, 1989Assignee: Draiswerke GmbHInventor: Norbert Stehr
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Patent number: 4785967Abstract: A liner for a cylindrical container (1) of a mixer for mixing materials that tend to adhere has at least one plate (18) of antiadhesive plastic, which is interchangeably located on the inner wall (9) of the container (1). In order to devise a largely unsecuted and thus easily mountable linear, the at least one plate (18) is elastically pressed radially outward, in the vicinity of the ends of the container (1), against the inner wall (9) of the container (1) by at least one tension ring (21, 22). The tension rings (21, 22) comprise smooth, plate-like plastic preventing the adhesion of materials.Type: GrantFiled: February 4, 1986Date of Patent: November 22, 1988Assignee: Draiswerke GmbHInventor: Werner Christen
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Patent number: 4739936Abstract: A closed agitator mill for grinding and mixing solids in liquids has a grinding space partially filled with auxiliary grinding elements, in which an agitator mechanism that can be driven at high speed is located; the agitator mechanism comprises an agitator shaft and agitator tools attached to it and generates a flow of grinding stock and auxiliary grinding bodies. At least one tubular screen cartridge, which is interchangeable from outside, is disposed before a ground stock outlet from the grinding space. The screen cartridge protrudes into the space between the agitator shaft and the wall of the grinding space and serves to separate the auxiliary grinding elements from the grinding stock.Type: GrantFiled: November 8, 1985Date of Patent: April 26, 1988Assignee: Draiswerke GmbHInventor: Norbert Stehr
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Process for gluing wood chips and the like with liquid glue and apparatus for performing the process
Patent number: 4572845Abstract: In an apparatus for the continuous gluing of wood chips and the like with liquid glue, the chips are raised from a longitudinally moved chip bed and are returned into the same in free fall in the form of chip mists. The glue is exclusively supplied to the chips by pressure atomization by means of a plurality of pressure atomizing nozzles.In order to achieve good gluing quality with limited mixer dirtying and easy operation, glue distribution takes place in the chip mists substantially over the entire length of the chip bed and alternately at least one nozzle is closed, while at least one nozzle is open.Type: GrantFiled: June 15, 1984Date of Patent: February 25, 1986Assignee: Draiswerke GmbHInventor: Werner Christen -
Patent number: 4527902Abstract: In a method for the continuous addition of glue to a mixture consisting of wood chips, wood fibres or the like, the mixture is moved helically, in the form of a ring of mixture, through at least one glue-applying zone of a mixing container where glue is supplied to the mixture substantially radially from the inside of the ring of mixture.In order to achieve a particularly satisfactory distribution of glue over the chips or fibres with the use of little energy and so little destruction of the chips, the glue is very finely atomized in the space situated inside the ring of mixture and is supplied to the ring of mixture largely radially. For this purpose, glue nozzles, to which glue can be supplied under pressure by a glue proportioning pump, are mounted on the shaft of the mixing container.Type: GrantFiled: March 1, 1984Date of Patent: July 9, 1985Assignee: Draiswerke GmbHInventor: Werner Christen