Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C4/00—Crushing or disintegrating by roller mills
  • B02C4/28—Details
  • B02C4/40—Detachers, e.g. scrapers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C4/00—Crushing or disintegrating by roller mills
  • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
  • B02C4/04—Crushing or disintegrating by roller mills with two or more rollers specially adapted for milling paste-like material, e.g. paint, chocolate, colloids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C4/00—Crushing or disintegrating by roller mills
  • B02C4/28—Details
  • B02C4/32—Adjusting, applying pressure to, or controlling the distance between, milling members
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C4/00—Crushing or disintegrating by roller mills
  • B02C4/28—Details
  • B02C4/44—Cooling or heating rollers or bars

Definitions

• the invention relates to a rolling mill, in particular a three-roll mill, for Zer ⁇ réelleung and homogenization of viscous masses, in particular for dispersion and uniform distribution in a binder suspended solid particles.
• a rolling mill has at least two rollers mounted so as to be rotatable about their longitudinal axes, wherein the axis of rotation of the first roller is mounted stationary and the axis of rotation of a second roller is movably mounted. With at least one pressing device, pressing of at least one roller takes place against the other.
• roller pressing Known devices for roller pressing are spindle drives or hydraulic pressing devices.
• a rolling mill with hydraulic roller pressing is known from EP 0 151 997 B1.
• hydraulic drives represent a relatively compact form of roller pressing
• hygienic sampling belts repeatedly emerge during operation due to escaping hydraulic fluid. This is a problem in particular when processing pastes for cosmetic, pharmaceutical or nutraceutical applications or for the processing of pasty materials under clean-room conditions.
• the invention is therefore based on the object to provide a rolling mill of the above-mentioned n basic design, which allows an improvement in product quality and on the one hand the disadvantages of roller pressing by means of spindle drives and the disadvantages of roller pressing by hydraulic drives and on the other hand by besere sere Mahlarbeit product inhomogeneities and inadequate Avoids cooling.
• This object is achieved in the aforementioned rolling mill with the features of the patent claim, characterized in that a mechanical-pneumatic pressing device is used as the pressing device for roll pressing. This represents a cost-effective solution that meets the hygiene requirements.
• the mechanical-pneumatic pressing device has a force transducer acting on a movable journal bearing of the movable roller (s) and a pneumatic drive acting on the force transducer.
• This combination of pneumatic drive and force transducer is particularly cost-effective.
• the force transducer amplifies the force generated by the pneumatic drive.
• the force converter reduces the distance traveled by the pneumatic drive, so that a much smaller path is traveled during the roller pressing than at the pneumatic drive.
• a high positioning accuracy of the movable roller (s) is obtained with relatively inexpensive means.
• the pressing device acting on the movable roller has on the one hand a first force transducer acting on a first movable axle bearing of the movably mounted roller and a first pneumatic actuator acting on the first force transducer and on the other hand a second acting on a second movable axle bearing of the movably mounted roller Force transducer and ei ⁇ nen acting on the second force transducer second pneumatic drive.
• This makes it possible to achieve a pressing of the at least one movably mounted roller at its two end points. This facilitates a correction of Walzienpressung at unsymmetrical wear of the rollers.
• the pressing device may comprise a force transducer and a pneumatic drive acting on the force transducer, the force transducer acting on a fork device with two fork ends, the first fork end acting on a first movable axle bearing of the movably mounted roller and the second fork de acts on a second movable axle bearing of the movably mounted roller.
• a lever device in particular a toggle lever or an eccentric and combinations of lever and eccentric can be used.
• purely pneumatically operated force transducers may also be used, e.g. They have a large piston and a small piston, which communicate with one another, or a gear can be used as a force transducer.
• the rolling mill according to the invention is a so-called "triple whale" with three parallel rollers.
• the axis of rotation of the middle roller is fixedly mounted, while the axis of rotation of the front roller or feed roller and the axis of rotation of the rear roller or take-off roller are movable gel agert.
• it has a front mechanical-pneumatic pressing device for pressing the front roller against the central roller and a rear mechanical-pneumatic pressing device for pressing the rear roller against the central roller.
• the subtask of avoiding product inhomogeneities by z. B. undispersed oversized grain is achieved by a rolling mill with the features of claim 8.
• the back roll or take-off roll intended for product removal has a shorter axial process length than the middle roll and is axially disposed relative to the middle roll such that the ends of the process length of the center roll over both ends of the process length of the back roll and take-off roll, respectively protrude axially hin ⁇ .
• the sub-task of improvedde ⁇ wi tion are in the rolling mill or three-roll mill a first plane, which is defined by the axis of rotation of the front roller or feed roller and by the axis of rotation of the mittle ⁇ Ren roller, and a second plane, which is defined by the axis of rotation of the central roller and by the axis of rotation of the rear roller or take-off roller, inclined at an angle between about 10 ° and a maximum of 90 ° to each other, in particular the first plane is horizontal, while the second Level obliquely upwards (in side view L-shaped arrangement of the rollers).
• the angle is 30 ° to 60 ° and more preferably about 45 °.
• the roll surfaces or process surfaces are preferably formed from a metal-free ceramic material, wherein the rolls preferably have a ceramic cylinder fitted onto a hollow metal cylinder. This eliminates any metallic contamination of the product during its comminution due to roll rubbing. This is particularly important in the processing of pastes for applications in electronics and for the manufacture of insulator bodies based on fine ceramics.
• the rollers are cooled from the inside. This is e.g. important in the processing of organic pigments, in particular in some yellow pigments.
• both the front roller and the rear roller are pressed by means of a mechanical-pneumatic pressing device against the middle roller.
• a mechanical-pneumatic pressing device against the middle roller.
• the mechanical-pneumatic pressing device on a scheme for gap adjustment. Since the force transducer, as explained above, a "force transmission tion "and a" Weguntermann "allows the relatively weak force of a pneumatic for the purpose of roll pressing can be multiplied and at the same time the specified by the pneumatic accuracy for the gap setting were ⁇ greatly increased.
• a scraper is applied to the take-off roll, over which the comminuted homogenized mass is stripped off, the scraper also preferably consisting of a metal-free material, in particular of a ceramic material or of a polymer material.
• a metal-free material in particular of a ceramic material or of a polymer material.
• At least the catchment area of the rolling mill is covered by a hood.
• a hood This prevents unwanted impurities from entering the product from the factory floor and, conversely, prevents unwanted volatile product constituents from escaping into the factory hall.
• the space under the hood is connected to a gas vent.
• Da ⁇ by z. B. contained in the solvent of the product volatile substances are kept away from the air of a factory hall.
• Fig. 1 is a schematic side view of a first embodiment of the rolling mill according to the invention
• Fig. 2 is a plan view of the rollers of the first embodiment in Fig. 1;
• FIG. 3 is a schematic side view corresponding to FIG. 1 of a second exemplary embodiment
• FIG. and FIG. 4 is a plan view of the rollers of the second embodiment in FIG. 3.
• FIG. 3 is a schematic side view corresponding to FIG. 1 of a second exemplary embodiment
• FIG. and FIG. 4 is a plan view of the rollers of the second embodiment in FIG. 3.
• FIG. 3 is a schematic side view corresponding to FIG. 1 of a second exemplary embodiment
• FIG. and FIG. 4 is a plan view of the rollers of the second embodiment in FIG. 3.
• FIG. 1 A first embodiment of the rolling mill according to the invention is shown in FIG. 1 and in FIG. 2.
• the three-roll mill shown here contains three rollers 1, 2, 3, which are aligned parallel to each other and all arranged in a plane E.
• the axis of rotation A1 of the front roller 1, the axis of rotation A2 of the central roller 2 and the axis of rotation A3 of the rear roller 3 are parallel to one another (see FIG. 2) and are all in one and the same plane E.
• the front roller 1 and the rear roller 3 are pressed by means of a front pressing device 4 and by means of a rear pressing device 5 respectively against the central roller 2, whose axis of rotation A2 is mounted stationary.
• the front roller 1 and the rear roller 3 are movably supported, i. their axes of rotation A1 and A3 can be pivoted about a pivot axis D3.
• the lateral surfaces of the rolls 1, 2, 3 each represent the rolling process surface S1, S2, S3, which come into contact with the product to be processed.
• a nip is formed during operation by the product passing between the rollers 1 and 2 pressed against each other.
• a nip is formed between the process surface S3 of the rear roller 3 and the process surface S2 of the middle roller 2 during operation by the product passing between the rollers 2 and 3 pressed against each other.
• the front pressing device 4 and the rear pressing device 5 each have a force converter 6 and a pneumatic drive T.
• the force transducer is a toggle 6, which is formed of a first lever 6A and a second lever 6B, while the pneumatic actuator 7 is formed by a pneumatic cylinder 7A and a Pneurnatikkolben.
• the power flow of the pressing devices 4 and 5 is based on the mounted in the pneumatic cylinder 7A pneumatic piston 7B, which is articulated via a piston rod 7B with the first lever 6A on a hinge axis D1.
• the first lever 6A is articulated on a second Gelenk ⁇ axis D2 on the second lever 6B, which in turn is articulated to a pivot axis D3 and each forms a pivotable suspension and mounting of vor ⁇ their roller 1 and the rear roller 3.
• the toggle lever 6A, 6B serving as force converter 6 and roller suspension causes an increase in the pneumatic force of the pneumatic drive 7 by a factor of about 20 to 50, where this increased force is used for roller pressing , As a result, a sufficiently strong roller pressing is also possible with a pneumatic drive 7.
• this force converter 6 causes a reduction in the stroke traveled by the pneumatic drive 7 by a factor of approximately 1/50 to 1/20, wherein this reduced stroke is used for adjusting the gap.
• rollers 1, 2 and 3 are driven by the motor M by gears (not shown).
• the roller block 1, 2, 3 and the engine block M are surrounded by a housing G.
• the rear roller 3 is arranged axially with respect to the middle roller 2 such that the ends of the process length L2 of the middle roller 2 project axially beyond the ends of the process length L3 of the rear roller 3 on both sides. This ensures that, during operation of the three-roll mill, unrestrained or only insufficiently rubbed product does not reach the rear roller 3 from the middle roller 2, as a result of which a significant improvement in product quality can be achieved.
• FIG. 3 A second embodiment of the rolling mill according to the invention is shown in FIG. 3 and in FIG. 4.
• FIG. 3 and in FIG. 4 which show elements of the second exemplary embodiment deviating from the first exemplary embodiment, have no line. Their function and meaning are explained below.
• the three-roll mill shown here comprises three rollers 1 ', 2', 3 'which Although aligned parallel to each other, but not all are arranged in one and the same plane. Rather, the axis of rotation A1 1 of the front roller V and the axis of rotation A2 'of the central roller 2' are arranged in a first plane E1, while the axis of rotation A3 'of the rear roller 3' and the axis of rotation A2 'of the central roller 2' in a second Plane E2 are arranged, which forms an angle ⁇ of about -45 ° to the first plane E1.
• This arrangement of the three rolls 1 ', 2', 3 "allows the present as a viscous mass product with the dispersed solid particles (eg pigments) during its passage through the rolling mill can be cooled longer and thus stronger than an Anord ⁇ tion, in which the axes of rotation of the front, the middle and the rear roller lie in a plane.
• FIG. 4 is a plan view of the rollers 1 ', 2', 3 "of the second embodiment of the rolling mill shown in FIG. 3.
• the rear roller 3 ' is likewise arranged axially with respect to the middle roller 2' such that the ends of the process length L2 'of the middle roller 2' extend axially beyond the ends of the process length L3 1 of the rear roller 3 'on both sides.
• This product trough increases with its addition to the usual wedge seals provided Aufsetzkeilen the tightness and thus ensures a lower lateral product loss.
• a scraper 9 with a scraper blade is used to remove the product from the rear roller 3 '.
• the scraper 9 is equipped with an automatic knife adjustment, which is controlled by a PLC control.
• roller surfaces or roller process surfaces S1, S2, S3 or S1 ', S2', S3 'can consist of ceramic material.
• the scraper 9 shown in Fig. 3 may also be made of ceramic material or of polymer material. These or other metal-free materials for the roller process surfaces and the stripper blade are of particular interest for the processing of pastes for the electronics industry.
• the ceramic rolls are rounded at the end of the roll process length.
• the pneumatic drive 7 operates, for example, with pressures of up to 4 bar, which come by means of Kraft ⁇ converter 6 to the required line pressures in the nips.
• the force transducer 6 makes it possible to increase the pressing force acting on the rollers by the rolling press devices 4, 5 by a factor of about 10 to about 80. Accordingly, by reducing the stroke provided by the pneumatic drive 7 by means of the force transducer, the accuracy of the gap adjustment becomes the same Factor increased.
• the rollers have a diameter of 300 mm and the rear roller 3, 3 'i st by about 4 mm to 5 mm shorter than the middle roller 2, 2'. This ensures that the wiper 9 strips only rubbed product from the rear roller 3 '.

Landscapes

• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Crushing And Grinding (AREA)
• Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Buildings Adapted To Withstand Abnormal External Influences (AREA)
• Press Drives And Press Lines (AREA)
• Accessories For Mixers (AREA)

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Family Cites Families (31)

• 2004
  • 2004-10-26 DE DE102004052084.4A patent/DE102004052084B4/de not_active Expired - Fee Related
• 2005
  • 2005-09-12 CN CN2005800367965A patent/CN101048231B/zh not_active Expired - Fee Related
  • 2005-09-12 EP EP07007982A patent/EP1818101B1/fr not_active Expired - Lifetime
  • 2005-09-12 CN CNA2007101304606A patent/CN101091929A/zh active Pending
  • 2005-09-12 BR BRPI0518381-2A patent/BRPI0518381A2/pt not_active IP Right Cessation
  • 2005-09-12 WO PCT/CH2005/000539 patent/WO2006045206A1/fr not_active Ceased
  • 2005-09-12 AT AT07007982T patent/ATE439189T1/de not_active IP Right Cessation
  • 2005-09-12 JP JP2007538235A patent/JP2008517746A/ja active Pending
  • 2005-09-12 CN CN2007101304610A patent/CN101091930B/zh not_active Expired - Fee Related
  • 2005-09-12 DE DE502005007907T patent/DE502005007907D1/de not_active Expired - Lifetime
  • 2005-09-12 EP EP05777390A patent/EP1809421A1/fr not_active Withdrawn
  • 2005-09-12 CA CA002585305A patent/CA2585305A1/fr not_active Abandoned
  • 2005-09-12 ES ES07007982T patent/ES2330265T3/es not_active Expired - Lifetime
  • 2005-09-12 EP EP07007983A patent/EP1818102A3/fr not_active Withdrawn
  • 2005-10-20 TW TW094136687A patent/TW200624176A/zh unknown
• 2007
  • 2007-04-26 US US11/789,839 patent/US20070245788A1/en not_active Abandoned
  • 2007-04-26 US US11/789,848 patent/US20070235575A1/en not_active Abandoned
  • 2007-04-26 US US11/789,847 patent/US20070245793A1/en not_active Abandoned
  • 2007-07-10 JP JP2007180840A patent/JP2007301564A/ja not_active Withdrawn
  • 2007-07-10 JP JP2007180836A patent/JP4804428B2/ja not_active Expired - Fee Related

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