US20050124263A1 - Grinding arrangement - Google Patents

Grinding arrangement Download PDF

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Publication number
US20050124263A1
US20050124263A1 US10/978,717 US97871704A US2005124263A1 US 20050124263 A1 US20050124263 A1 US 20050124263A1 US 97871704 A US97871704 A US 97871704A US 2005124263 A1 US2005124263 A1 US 2005124263A1
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US
United States
Prior art keywords
arrangement
grinding
grinding stone
chopper
knives
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/978,717
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English (en)
Inventor
Steffen Clauss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deere and Co
Original Assignee
Deere and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deere and Co filed Critical Deere and Co
Assigned to DEERE & COMPANY reassignment DEERE & COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CLAUSS, STEFFEN
Publication of US20050124263A1 publication Critical patent/US20050124263A1/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
    • A01F29/00—Cutting apparatus specially adapted for cutting hay, straw or the like
    • A01F29/09—Details
    • A01F29/22—Arrangement of knife sharpening devices

Definitions

  • the invention concerns a grinding arrangement with a grinding stone for grinding at least one knife of a chopper arrangement, a movement arrangement for moving the grinding stone along the chopper arrangement, a measurement arrangement for the provision of a signal that contains information regarding the force applied by the grinding stone of the knife during the grinding process and a control arrangement that controls the movement arrangement as a function of the signal of the measurement arrangement.
  • the knives fastened to the chopper arrangement wear over time. It is possible that individual knives wear at different rates. While the knives around the circumference of the chopper arrangement as a ruled wear at approximately uniform rates, the wear along the width of the chopper arrangement may vary considerably. Thereby, the diameter of the enveloping circle described by the cutting edges of the knives can vary in the axial direction of the shaft of the chopper arrangement.
  • a cylindrical or slightly concave shape is desired as a target shape in order to simplify the automatic repositioning of the shearbar or in order to make this possible depending upon the repositioning system.
  • a parallel and precise in-feed of the shearbar towards the circumference of the chopper arrangement is indispensable for a effective chopper process.
  • U.S. Pat. No. 6,503,135 proposes that the actual shape of the enveloping circle described by the knives of a chopper arrangement be detected before a grinding process and to thereupon move the grinding stone on the basis of the results of the measurement in such a way that a desired shape of the enveloping circle is attained.
  • the shape of the enveloping circle is detected by means of a knock sensor or by a magnetic sensor associated with the grinding stone or with the shearbar.
  • the force applied to the shearbar is measured.
  • an improved grinding arrangement for grinding knives of a chopper arrangement there is provided an improved grinding arrangement for grinding knives of a chopper arrangement.
  • An object of the invention is to provide a grinding stone arrangement which has its movement relative to cutting knives controlled by signals representing the force applied by the grinding stone to the knives.
  • the invention proposes that a force measurement cell be attached to any desired location in the connecting line or power flux connection between the grinding stone and the chopper arrangement.
  • the force measurement detects the load or the pressure exerted by the grinding stone on the knife or knives of the chopper arrangement during the grinding process.
  • the value measured by the force measurement cell is all the greater when the enveloping curve of the knives is closer to the grinding stone and the smaller when the knives are separated from the grinding stone.
  • the chopper arrangement can be brought into an optimum shape tat makes possible the repositioning to a sufficiently small cutting gap. Thereby the energy required for the chopper operation can be reduced or at a constant energy level a higher throughput can be attained. Furthermore, the quality of the chopper operation or the length of cut is improved (that is, the uniformity and precision of the cut). The proportion of uncut components, such as husks or leaves, is sharply reduced or even eliminated.
  • the movement arrangement for the grinding stone is controlled by the control arrangement in such a way that the grinding stone brings the cutting edge of the knife into a certain target shape which may be a predetermined shape or a shape that can be selected from several inputs or from any desired input shape.
  • the control arrangement can perform a comparison between the information made available by the measurement arrangement regarding the actual present shape of the cutting edge and the target shape and control the movement arrangement as a function of the result of the comparison.
  • the grinding stone is controlled by the movement arrangement that transports the grinding stone across the width of the chopper arrangement and provides an in-feed as a function of the signal of the measurement arrangement and brings about a movement of the grinding stone in such a way that any deviation in the shape of the cutting edges of the knives is automatically equalized.
  • the chopper arrangement may include a chopper drum in open or closed form to which several knives are attached.
  • the chopper drum is arranged on a shaft that is brought into rotation during the grinding and in its normal operation, as a rule, rotates in the opposite direction compared to the normal chopper operation.
  • the measurement arrangement detects information about the distance between the shaft and the cutting edges of the knives, that is, the radius of the enveloping circle described by the cutting edges.
  • the invention can also be applied to chopper arrangements with web disk wheel choppers. There it is not the radius of the cutting edges of the knives that is detected, but their axial position.
  • the force measurement cell can be attached between the grinding stone retainer of the grinding stone and a frame to which the grinding stone retainer is fastened and that also carries the chopper arrangement.
  • the grinding stone retainer can be traversed across the width of the chopper arrangement and is supported in bearings on a shaft.
  • the force measurement cell may be arranged between the shaft and the frame or between the shaft and the grinding stone retainer.
  • control arrangement can make an error signal available in case the measured force that is applied to the grinding stone exceeds a threshold value.
  • This error signal can be provided to the operator optically or acoustically and points to a knife projecting too far outward.
  • the grinding process can be stopped automatically. Thereby, damage (breaking out) or unusual wear of the grinding stone can be avoided, since in the case of excessive force between the grinding stone and the drum countermeasures are taken.
  • the present invention can be applied to a multitude of arrangements with knives that must be sharpened. It can be used in particular on self-propelled or towed harvesting machines with chopper drums or web disk wheel choppers.
  • FIG. 1 is a schematic left side view of a harvesting machine with a chopper arrangement.
  • FIG. 2 is a front view of a first embodiment of a grinding arrangement.
  • FIG. 3 is a front view of a second embodiment of a grinding arrangement.
  • the harvesting machine 10 shown in FIG. 1 in the form of a self-propelled forage harvester is supported on a frame 12 that is carried by front and rear wheels 14 and 16 .
  • the harvesting machine 10 is controlled from an operator's cab 18 from which a harvested crop take-up arrangement 20 can be seen.
  • Crop taken up from the ground by means of the take-up arrangement 20 can be seen.
  • Crop taken up from the ground by means of the take-up arrangement 20 for example, corn, grass or the like, is conducted to a chopper arrangement 22 in the form of a chopper drum, which chops it into small pieces and delivers it to a conveyor arrangement 24 .
  • a post-chopper reduction arrangement 28 extends (during the corn harvest) between the chopper arrangement 22 and the conveyor arrangement 24 through which the crop to be conveyed is conducted tangentially to the conveyor arrangement 24 .
  • FIG. 2 shows a schematic view of a chopper arrangement 22 and a grinding arrangement 26 associated with it, as it is seen when looking at the harvesting machine 10 in FIG. 1 from the front (relative to the direction of operation).
  • the chopper arrangement 22 is provided with a number of knives 38 distributed over its width at its circumference which cut harvested crop taken up by the harvested crop take-up arrangement 20 in interaction with a rigid shearbar 46 .
  • the chopper arrangement 22 includes a central shaft 32 , that can be driven in rotation by means of a belt pulley 36 at its end face and belts, not shown, by a motor of the harvesting machine 10 .
  • the shaft 32 is supported by two rolling contact bearings 56 arranged on both sides of the chopper arrangement 22 on the frame 12 of the harvesting machine 10 .
  • the grinding arrangement 26 is provided above the chopper arrangement 22 near the enveloping circle described by the knives 38 .
  • the grinding arrangement 26 essentially includes a grinding stone 42 , a grinding stone retainer 40 associated with it and a support shaft 44 oriented parallel to the shaft 32 , on which the grinding retainer 40 is supported in bearings, free to slide.
  • the chopper arrangement 22 is brought into rotation, as a rule in the opposite direction of rotation and/or at a reduced rotational speed, compared to the normal chopper operation.
  • the grinding stone retainer 40 with the grinding stone 42 attached to it is shifted across the entire width of the chopper arrangement 22 by means of a movement arrangement 48 from a rest or park position, not shown, in which it is arranged at the side alongside the chopper arrangement 22 . Thereby, the underside of the grinding stone 42 is in contact with the knives 38 and sharpens them.
  • the grinding stone 42 traverses several times across the width of the chopper arrangement 22 .
  • the end points of this sliding movement are illustrated in FIG. 2 by the grinding stone retainers with the part number call-out 40 at the left reversal point and 40 ′ at the right reversal point.
  • an in-feed of the grinding stone 42 can be performed, that is a small movement of the grinding stone 42 towards the knives 38 .
  • a mechanical element (ratchet wheel) is used that interacts with an element fixed to the frame when one or both of the reversal points of the grinding stone retainer 40 are reached.
  • the rotation of the mechanical element is converted into a sliding movement by means of a screw thread, so that the grinding stone 42 is provided with an in-feed towards the chopper arrangement 22 .
  • the movement arrangement 48 of the grinding arrangement 26 is controlled by a control arrangement 52 , shown schematically in FIG. 2 which controls the shifting of the grinding stone 42 by the movement arrangement 48 as well as the in-feed in the manner described above.
  • the control arrangement 52 is supplied with information about the immediate position of the grinding stone 42 , this can be provided by a corresponding sensor 58 , which detects the immediate position of the movement arrangement 48 , or that the control arrangement 52 has been supplied with information into which position it has brought the grinding stone retainer 40 .
  • the number of impulses can be stored in memory that have been delivered to a stepper motor of the movement arrangement 48 .
  • the control arrangement 52 can control the drive of the chopper arrangement 22 .
  • the in-feed could also be performed by a separate motor, particularly an electric motor or a hydraulic motor, that would also have to be connected with the control arrangement 52 .
  • a separate motor particularly an electric motor or a hydraulic motor, that would also have to be connected with the control arrangement 52 .
  • the entire grinding stone retainer 40 or the shaft 44 could be moved in the in-feed direction.
  • the control arrangement 52 is connected with a memory 54 and with two force measurement cells 50 , that are used as a measurement arrangement.
  • the force measurement cells 50 are arranged close to both ends of the shaft 44 between the shaft 44 and the frame 12 or an element connected to it.
  • the force measurement cells 50 may be of any desired configuration, such as piezo-electric sensors or strain gages. They deliver a measurement value to the control arrangement 52 , that is proportional to the force applied to the knives 38 by the grinding stone 42 or the reverse. this force contains information regarding the enveloping curve described by the knives 38 on the immediate position of the grinding stone 42 .
  • each of the shafts 44 can be associated with two force measurement cells 50 at the ends, or the two shafts 44 are connected to each other at both ends and supported in each case on the frame over a single force measurement cell 50 .
  • the use of a single shaft 44 is also conceivable that has a non-circular cross section (for example, a rectangular cross section).
  • a grinding process can take place as described in the aforementioned U.S. Pat. No. 6,503,135.
  • the control arrangement 52 brings about a traverse across the width of the chopper arrangement 22 by the grinding stone 42 by means of the movement arrangement 48 , and then is again traversed back into the original position.
  • the grinding stone 42 can remain in the position into which it was brought during the preceding grinding process, or, if necessary, provided with an in-feed towards the chopper arrangement 22 .
  • This process can be used to determine whether an in-feed of the grinding stone 42 is required. This is the case if no signal (or a relatively minor signal) is generated by the force measurement cell 50 in at least one location of the chopper arrangement 22 .
  • the force measurement cell 50 During the traverse of the width of the chopper arrangement 22 , the force measurement cell 50 generates a signal that is a function of the spacing between the cutting edges of the knives 38 and the grinding stone 42 .
  • the control arrangement 52 is supplied with information over an appropriate analog digital converter about the amplitude of this signal.
  • the grinding stone 42 is not in-fed any further and is brought to a first position at the chopper arrangement 22 , as a rule at the left or right outside. It remains in this position until the force measurement cell 50 generates an output signal that corresponds to a desired force between the grinding stone 42 and the cutting edges of the knives 38 , so that a sufficient sharpness is attained by the parts of the knives 38 that interact with the grinding stone 42 .
  • the grinding stone 42 is transported by the movement arrangement 48 through a distance corresponding to its width further to the left or the right and grinds the knives there. In this way, the entire width of the chopper arrangement 22 is processed successively. As a rule, the process described is repeated and/or performed multiple times at a reversed direction of movement. At the conclusion of the grinding process, a normal grinding and/or honing of the entire chopper arrangement 22 can be performed in a manner known in itself. Finally, the grinding stone 42 is brought into its park position.
  • a grinding process alternative to that described above is performed in such a way that the grinding stone 42 continuously traverses the entire width of the chopper arrangement 22 , until a constant spacing between the shaft 32 and the cutting edges of the knives 38 is attained.
  • the control arrangement 52 can recognize from the output signal of the force measurement cell 50 , whether a constant spacing between the shaft 32 and the cutting edges of the knives 38 has been reached, and that corresponding thereto the grinding process can be ended. In this move, and in-feed of the grinding stone 42 can be performed, if the force measurement cell 50 does not detect a contact between the grinding stone 42 and the knives 38 at one or more places of the chopper arrangement 22 .
  • the control arrangement can traverse the grinding stone retainer 40 one more time before the honing or during a subsequent normal grinding process across the width of the chopper arrangement 22 and detect the space in between the shaft 32 and the cutting edges of the knives 38 by means of the force measurement cell 50 . If the shape of the cutting edges of the knives 38 is unsatisfactory here, a new grinding process is performed in the manner described above.
  • FIG. 3 shows a second embodiment of a grinding arrangement 26 according to the invention. Components that correspond to those of the first embodiment are designated by the same part number call-outs. There is a difference regarding the force measurement cell 50 that is arranged between the grinding stone 42 and the grinding stone retainer 40 in the embodiment according to FIG. 3 . Here the force measurement cell 50 also delivers information regarding the force applied by the grinding stone 42 to the knives 38 . The control arrangement 52 controls the movement arrangement 48 as a function of this information in the manner described above.
  • the electrical connection between the force measurement cell 50 and the control arrangement 52 can be performed by a flexible cable or by a contact strip located on the shaft 44 connected with the control arrangement 52 , which is fixed to the frame and electrically insulated from the shaft 44 , with which a second contact strip on the grinding stone retainer 40 interacts, this is connected with the force measurement cell 50 .
  • a radio frequency connection is provided between the force measurement cell 50 and the control arrangement 52 .

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
  • Disintegrating Or Milling (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US10/978,717 2003-12-06 2004-11-01 Grinding arrangement Abandoned US20050124263A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10357177A DE10357177A1 (de) 2003-12-06 2003-12-06 Schleifvorrichtung
DE10357177.9 2003-12-06

Publications (1)

Publication Number Publication Date
US20050124263A1 true US20050124263A1 (en) 2005-06-09

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US10/978,717 Abandoned US20050124263A1 (en) 2003-12-06 2004-11-01 Grinding arrangement

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US (1) US20050124263A1 (de)
EP (1) EP1537772B1 (de)
AT (1) ATE352196T1 (de)
CA (1) CA2488977A1 (de)
DE (2) DE10357177A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070271893A1 (en) * 2006-05-29 2007-11-29 Manfred Pollklas Agricultural harvesting machine
US20140215985A1 (en) * 2013-02-07 2014-08-07 Claas Selbstfahrende Erntemaschinen Gmbh Agricultural harvesting machine
US11350569B2 (en) 2017-01-06 2022-06-07 Cnh Industrial America Llc Forage harvester comprising a monitoring mechanism for shear bar and cutting drum
US11963483B1 (en) * 2022-12-26 2024-04-23 Institute of Environment and Sustainable Development in Agriculture, CAAS Straw crushing device capable of driving sharpening structure

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009011035A1 (de) 2009-03-02 2010-09-09 Claas Selbstfahrende Erntemaschinen Gmbh Landwirtschaftliche Erntemaschine
EP3738428A1 (de) 2019-05-16 2020-11-18 CLAAS Selbstfahrende Erntemaschinen GmbH Fahrerassistenzsystem eines feldhäckslers
DE102021104158A1 (de) 2021-02-22 2022-08-25 Deere & Company Schleifeinrichtung für eine mit einer Anzahl an Messern versehene Häckseltrommel eines Feldhäckslers
DE102021112650A1 (de) * 2021-05-17 2022-11-17 Claas Selbstfahrende Erntemaschinen Gmbh Verfahren zur Bestimmung des Schleifbedarfs von Häckselmessern einer Häckselvorrichtung
DE102023105607A1 (de) 2023-03-07 2024-09-12 Claas Saulgau Gmbh Schleifvorrichtung für Häckselmesser eines Häckselwerks, Häckselwerk und Verfahren zum Schleifen der Häckselmesser eines Häckselwerks

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5072550A (en) * 1989-11-27 1991-12-17 Nippon Seiko Co., Ltd. Grinding method and grinding machine with controlled grinding force
US6468132B2 (en) * 2000-07-22 2002-10-22 Deere & Company Grinding arrangement
US6503135B2 (en) * 2000-07-22 2003-01-07 Deere & Company Grinding device
US6852005B2 (en) * 2001-07-19 2005-02-08 Ernst Thielenhaus Gmbh & Co. Kg Device for processing the finish of work pieces

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10017719A1 (de) * 2000-04-11 2001-10-18 Knecht Maschb Gmbh Vorrichtung zum Schleifen von Messern

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5072550A (en) * 1989-11-27 1991-12-17 Nippon Seiko Co., Ltd. Grinding method and grinding machine with controlled grinding force
US6468132B2 (en) * 2000-07-22 2002-10-22 Deere & Company Grinding arrangement
US6503135B2 (en) * 2000-07-22 2003-01-07 Deere & Company Grinding device
US6852005B2 (en) * 2001-07-19 2005-02-08 Ernst Thielenhaus Gmbh & Co. Kg Device for processing the finish of work pieces

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070271893A1 (en) * 2006-05-29 2007-11-29 Manfred Pollklas Agricultural harvesting machine
US7533516B2 (en) 2006-05-29 2009-05-19 Claas Selbstfahrende Erntemaschinen Gmbh Agricultural harvesting machine chopper drum sharpening device
US20140215985A1 (en) * 2013-02-07 2014-08-07 Claas Selbstfahrende Erntemaschinen Gmbh Agricultural harvesting machine
US9288941B2 (en) * 2013-02-07 2016-03-22 Claas Selbstfahrende Erntemaschinen Gmbh Agricultural harvesting machine with device for maintaining a comminution assembly
US11350569B2 (en) 2017-01-06 2022-06-07 Cnh Industrial America Llc Forage harvester comprising a monitoring mechanism for shear bar and cutting drum
US11963483B1 (en) * 2022-12-26 2024-04-23 Institute of Environment and Sustainable Development in Agriculture, CAAS Straw crushing device capable of driving sharpening structure

Also Published As

Publication number Publication date
DE10357177A1 (de) 2005-07-14
ATE352196T1 (de) 2007-02-15
DE502004002754D1 (de) 2007-03-15
CA2488977A1 (en) 2005-06-06
EP1537772B1 (de) 2007-01-24
EP1537772A1 (de) 2005-06-08

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Date Code Title Description
AS Assignment

Owner name: DEERE & COMPANY, ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CLAUSS, STEFFEN;REEL/FRAME:015956/0245

Effective date: 20041022

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION