• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Apparatus (14) for detecting the sharpness of cutting edges of chopping knives on a continuously driven chopper drum of a forage harvester, with a contact sensor designed as an electrode (18), wherein the electrode (18) is incorporated in a circuit (15), depending on whether one of the chopping blades (2) contacts the electrode (18), is closed, and has a counter-electrode (19), which is likewise arranged in the circuit (15) and which is arranged adjacent to the electrode (18).
    公开号:BE1023926B1
    申请号:E2016/5788
    申请日:2016-10-20
    公开日:2017-09-14
    发明作者:Stefan Birkhofer；Stefan Loebe；Kornelius Frank
    申请人:Claas Saulgau Gmbh；
    IPC主号:
    专利说明:

    Apparatus for detecting the sharpness of cutting edges of chopping knives of a chopper drum of a forage harvester
    The invention relates to a device for detecting the sharpness of cutting edges of chopping knives on a continuously driven chopper drum of a forage harvester according to the preamble of claim 1.
    From EP 2 527 087 B1 a device for detecting the sharpness of cutting edges of chopping knives of a continuously driven chopper drum of a forage harvester and a forage harvester with such a device are known. According to this prior art, the device for detecting the sharpness of the cutting edges of the chopper blades on the circumferentially driven cutterhead comprises an electrode designed as a contact sensor, which is integrated into a circuit. Depending on whether one of the chaff knives contacts the electrode, the circuit is closed, wherein the shaft of the chopper drum is further integrated into the circuit, which is integrated in the circuit via a slip ring body against which a current collector. Then, when according to EP 2 527 087 B1 one of the chopping blades contacts the electrode, the electric circuit is closed, and the current flows via the electrode designed as a contact sensor and the chopper blade and the shaft of the chopper drum to an evaluation unit, which is also integrated in the circuit is. The evaluation unit comprises a microcontroller to which measured values for the current flow and its duration are supplied as input signals. From this, the sharpness condition of the cutting edges of the chopper blades of the circumferentially driven chopper drum is determined. According to EP 2 527 087 B1, the shaft of the chopper drum is integrated in the circuit of the device for detecting the sharpness, for which purpose a slip ring body is required, against which a current collector is applied. As a result, a complex structure of the device for detecting the sharpness of the cutting edges of the chopping blades on the circumferentially driven chopper drum of the forage harvester is caused.
    Proceeding from this, the present invention has the object to provide a simpler device for detecting the sharpness of cutting edges of chopping knives a circumferentially driven chopper drum of a forage harvester.
    This object is achieved by a device for detecting the sharpness of cutting edges of chopping knives on a circumferentially driven chopper drum of a forage harvester according to claim 1. According to the invention, a counter electrode which is likewise integrated into the circuit is arranged adjacent to the electrode.
    According to the invention, a counter electrode cooperates with the electrode, which is integrated together with the electrode in the circuit and is arranged adjacent to the counter electrode. In contrast to the prior art, the shaft of the cutterhead is not included in the circuit of the device for detecting the sharpness of cutting edges of chopping knives of the cutterhead. As a result, the required according to the prior art slip ring body and pantograph can be dispensed with. The circuit of the device according to the invention is thereby shortened. Overall, the structure of the device for detecting the sharpness of cutting edges of chopping knives on a continuously driven chopper drum of a forage harvester can be simplified.
    Preferably, the counter electrode is also formed as a contact sensor, wherein the circuit is closed when one of the chopping blades contacts both the electrode and the counter electrode. For this purpose, the electrode and the counter electrode are electrically insulated from each other, such that the circuit is closed exclusively when one of the chopping blades contacts the electrode and the counter electrode simultaneously. This development of the invention allows a particularly simple and advantageous construction of the device for detecting the sharpness of cutting edges of chopping knives on a continuously driven chopper drum of a forage harvester. Only when a chopper contacts both the electrode and the counter electrode, the circuit is closed.
    Preferably, the electrode and the counter electrode are arranged on a common support element and preferably movable together relative to the circumferentially driven chopper drum in the axial direction of the chopper drum. These details also serve to further simplify the construction of the device for detecting the sharpness of cutting edges of chopping knives on a continuously driven chopper drum of a forage harvester. Electrode and counter-electrode are arranged on the common support element, as well as on the common support member movable together in the axial direction of the chopper drum.
    According to an advantageous development, the electrode and the counter electrode are arranged together on a sharpening of cutting edges serving grinding stone. This development is particularly preferred since the structure of the device can be further simplified by integrating the electrode and counterelectrode into the grindstone.
    According to an advantageous embodiment, the counter electrode is sleeve-like and surrounds the electrode in the radial direction, the counter electrode and the electrode, which are both formed as contact sensors or contact electrodes, preferably concentric with each other. This embodiment of the device according to the invention for detecting the sharpness of cutting edges of chopping knives on a continuously driven chopper drum is particularly robust and susceptible to wear.
    Preferred embodiments of the invention will become apparent from the dependent claims and the description. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:
    1 a continuously driven chopper drum of a forage harvester together with a device for detecting the sharpness of the cutting edges of the chopper blades of the chopper drum:
    Fig. 2 is a detail of Fig. 1; and
    3 shows a detail of FIG. 2.
    The invention relates to a device for detecting the sharpness of cutting edges of chopping knives on a continuously driven chopper drum of a forage harvester and a forage harvester with such a device.
    Fig. 1 shows the basic structure of a chopper drum 1 a forage harvester with their chopping blades 2, wherein the chopping blades 2 radially outside cutting edges 3 and are fixed radially inwardly via knife carrier 4 to a supporting structure 5. The chopper drum 1 is circumferentially drivable together with their chopping blades 2, in the direction of arrow I, wherein the chopper drum 1 is rotatably supported via its shaft 6, of which a rotation axis 7 is also shown. By driving the shaft 6, the chopper drum 1 together with their cutting blades 2 in the direction of arrow I is driven in rotation.
    Fig. 1 further shows a chopper housing 8, in which the chopper drum 1 is received. The chopper housing 8, based on the circumferentially driven-on chopper drum 1, designed to be fixed.
    The chopper drum 1 is used for chopping a crop 9, which is fed to the chopper drum 1 via so-called pre-press rollers 10a, 10b. With the cutting edges 3 of the chopper knife 2 a fixed counter-blade 11 cooperates to crush the Emtegut 9.
    A forage harvester comprising the chopper drum 1 and the chopper housing 8 also has a grinding device 12 for re-sharpening the cutting edges of the chopper blades 2, this grinding device 12 comprising a grindstone 13. The grindstone 13 is arranged in Fig. 1 in the region of a recess of the chopper housing 8 and can be delivered in the radial direction. Furthermore, the grindstone 13 can be moved parallel to the axis of rotation 7 of the shaft 6 of the chopper drum 1 and accordingly in the axial direction of the chopper drum 1.
    Furthermore, FIG. 1 shows details of a device 14 for detecting the sharpness of the cutting edges 3 of the chopper blades 2 of the chopper drum 1 driven in rotation.
    The device 14 for detecting sharpness of the cutting edges 3 of the chopper blades 2 comprises a circuit 15, in which in addition to an evaluation unit 16, a power source 17 and an electrode formed as a contact sensor or contact electrode 18, a counter electrode 19 is integrated. Thus, in Fig. 1, the electrode 18 is connected via a first power line 20a and the counter electrode 19 via a second power line 20b to the evaluation unit 16, wherein the current source 17 in the embodiment shown between the counter electrode 19 and the evaluation device 16 is connected in the second power line 20b is.
    The counter electrode 19 is formed as well as the electrode 18 as a contact sensor or contact electrode, the circuit 15 of the device 14 for sharpness detection 14 is closed only when a chopper knife 2 with its cutting edge 3 both the electrode 18 and the counter electrode 19 contacted. The electrode 18 and counter electrode 19 are electrically insulated from each other for this purpose, so that the circuit 15 can only be closed when one of the chopping blades 2, the electrode 18 and the counter electrode 19 contacted simultaneously.
    The counter electrode 19 is disposed adjacent to the electrode 18. Electrode 18 and counter electrode 19 are preferably arranged or fastened to a common support element in the preferred embodiment shown in the figures on the grindstone 13 of the grinding device 12. Electrode 18 and counterelectrode 19 are jointly relative to the continuously driven chopper drum 1 in the radial direction and axial direction the chopper drum 1, coupled to the corresponding movement of the grindstone thirteenth
    The measuring principle of the device according to the invention basically corresponds to the measuring principle of the device according to EP 2 527 087 B1. However, the shaft 6 of the chopper drum 1 is not integrated in the circuit 15 of the sharpness detection device 14, so that can be dispensed with a slip ring body. Rather, a likewise formed as a contact sensor or contact electrode counter electrode 19 is provided which, like the electrode 18 is not rotated, but at most relative to the continuously driven chopping knives 2 in the axial direction and radial direction of the chopper drum 1 is displaced.
    Then, when a radially outer surface 21 of the cutting edge 3 of a chopper blade 2 simultaneously touches the electrode 18 and the counter electrode 19, the circuit 15 is closed, so that then an electric current, the chopper blade 2 between the electrode 18 and counter electrode 19 and flows in the direction of Evaluation unit 16 can be routed.
    The evaluation unit 16 has a microcontroller 22, to which measured values of the electrical current flow and its duration are provided as input variables, the microcontroller 22 deriving from this, analogously to the manner known from EP 2 527 087 B1, the sharpness of the cutting edges 3 of the chopper blades 2 of FIG circumferentially driven chopper drum 1 determined. Information about the sharpness of the cutting edges 3 determined by the microcontroller 22 can be displayed to an operator via a display unit 23.
    As already stated, to close the electric circuit 15 of the sharpness detection device 14 according to the invention, a cutting blade 2 with its cutting edge 3 must contact the electrode 18 and the counter electrode 19 at the same time. Only then is the circuit 15 closed.
    Electrode 18 and counter electrode 19, which are both formed as contact sensors or contact electrodes are, as already stated, based on the rotating driven chopper drum 1, namely based on the rotating or rotating movement of the driven chopper drum 1, fixed. Electrode 18 and counter electrode 19, which are connected to a common support structure, in particular the grindstone 13, but are seen in the axial direction and radial direction of the chopper drum 1, displaced.
    In the illustrated preferred embodiment of the invention, the counter electrode 19 is sleeve-shaped and surrounds the electrode 18 radially outwardly, preferably concentrically. This can best be seen in FIG. 3, which shows a perspective view of a grindstone 13 and the electrodes 18, 19, which are picked up by the grindstone 13 and designed as contact sensors or contact electrodes.
    Thus, Fig. 3 shows that the counter electrode 19 is sleeve-like, and that the electrode 18 is positioned within the sleeve-like counter electrode 19. As already stated, electrode 18 and counterelectrode 19 are electrically insulated from one another, so that a current flow between electrode 18 and counterelectrode 19 is only possible if a chopper blade 2 contacts with its cutting edge 3 electrode 18 and counterelectrode 19 at the same time.
    The sharpness detection device 14 according to the invention is part of a forage harvester comprising the chopper drum 1 and a grinding device 12 with the grindstone 13.
    LIST OF REFERENCES 1 chopper drum 2 chopper blade 3 cutting edge 4 knife carrier 5 support structure 6 shaft 7 rotation axis 8 chopper housing 9 crop 10a pre-press roller 10b pre-press roller 11 counter cutting edge 12 grinding device 13 grindstone 14 sharpness detection device 15 circuit 16 evaluation device 17 current source 18 electrode 19 counter electrode 20a power line 20b power line 21 blade surface 22 microcontroller 23 display
    权利要求:
    Claims (10)
    [1]
    claims
    1. Device (14) for detecting the sharpness of cutting edges of chopping knives on a continuously driven chopper drum of a forage harvester, designed as an electrode (18) contact sensor, wherein the electrode (18) is incorporated in a circuit (15), depending on it whether one of the chopping blades (2) contacts the electrode (18), is closed, characterized in that a counterelectrode (19) also integrated in the circuit (15) is arranged adjacent to the electrode (18).
    [2]
    2. Apparatus according to claim 1, characterized in that the counter electrode (19) is also formed as a contact sensor, wherein the circuit is closed when one of the chopping blades (2) the electrode (18) and the counter electrode (19) contacted.
    [3]
    3. Apparatus according to claim 1 or 2, characterized in that the electrode (18) and the counter electrode (19) together relative to the circumferentially driven chopper drum (1) in the axial direction of the chopper drum (1) are movable.
    [4]
    4. Device according to one of claims 1 to 3, characterized in that the electrode (18) and the counter electrode (19) are arranged on a common support member.
    [5]
    5. Device according to one of claims 1 to 4, characterized in that the electrode (18) and the counter electrode (19) are arranged together on a sharpening of cutting edges serving grinding stone (13).
    [6]
    6. Device according to one of claims 1 to 5, characterized in that the electrode (18) and the counter electrode (19) are electrically insulated from each other, such that the circuit (15) is then closed when one of the chopping blades (2) the electrode (18) and the counter electrode (19) contacted simultaneously.
    [7]
    7. Device according to one of claims 1 to 6, characterized in that the electrode (18) and the counter electrode (19) to different, to an evaluation device (16) leading, power lines (20a, 20b) are connected.
    [8]
    8. Device according to one of claims 1 to 7, characterized in that the counter electrode (19) is sleeve-shaped and surrounds the electrode (18) in the radial direction.
    [9]
    9. Apparatus according to claim 7, characterized in that the counter electrode (19) and the electrode (18) extend concentrically with each other.
    [10]
    10. Forage harvester, with a chopper knife (2) having circumferentially driven chopper drum (1), and with a device (14) for detecting the sharpness of cutting edges (3) of chopping knives (2) according to one of claims 1 to 9.
    类似技术:
    公开号 | 公开日 | 专利标题
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    EP1023827A1|2000-08-02|Method of monitoring the sharpness of chaff-cutting blades
    DD286737B5|1993-09-16|METHOD FOR DETERMINING THE SHARPNESS OF HAECKSELMESSERN
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    EP1034892B1|2002-09-04|Grinding apparatus
    DE102017105439A1|2018-09-20|Chipping plant of a forage harvester, chopping blade for such a chopper and forage harvester
    DD286735A5|1991-02-07|METHOD FOR DETERMINING THE SHARPNESS OF HAECKSELMESSERN
    DE102010021746B4|2012-10-31|Apparatus and method for determining the wear on cutting blades of choppers
    EP2311601B1|2012-08-08|Method and device for detecting the sharpness of cutter blades on a chaff cutter
    EP0144325B1|1987-04-01|Device for the electro-chemical determination of the oxygen content in liquids
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    AT219112B|1962-01-10|Motor-driven device for stripping electrical conductors
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    DE1582568C|1971-04-22|Knife sharpening device on chopping machines
    同族专利:
    公开号 | 公开日
    DE102015120564A1|2017-06-01|
    BE1023926A1|2017-09-13|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102009033717A1|2009-07-13|2011-02-03|Hochschule für Technik und Wirtschaft Dresden|Device for determining sharpness of cutting edges of cutting tools utilized at field chopper, has electrical wire, sensor and pressing device that are attached at electronic evaluation-and control unit|
    DE102010021746A1|2010-05-20|2011-11-24|Hochschule für Technik und Wirtschaft Dresden|Chaff cutter cutting blade wear determining device for cutting crop, has stationary blade exhibiting length that is smaller than length of drum, where sensor element is arranged at stationary blade|
    DE102011005317A1|2011-03-09|2012-09-13|Technische Universität Dresden|Method for e.g. determining degree of wear i.e. blunting, of rotary blade in field chopper in agricultural field, involves determining reduction of width of blade back side and distance from blade to counter blade from parameters of curve|
    EP2527087A1|2011-05-21|2012-11-28|CLAAS Saulgau GmbH|Forage harvester with device for detecting cutting sharpness|
    DE102014218408A1|2013-10-31|2015-04-30|Deere & Company|Arrangement for detecting the sharpness of chopping knives|
    DD286737B5|1989-08-11|1993-09-16|Agritechnik Ing Betrieb|METHOD FOR DETERMINING THE SHARPNESS OF HAECKSELMESSERN|DE102018116237A1|2017-07-19|2019-01-24|Turck Holding Gmbh|Magnetic sensor, in particular for use on a chopper device|
    DE102018128449A1|2018-11-13|2020-05-14|Claas Saulgau Gmbh|Agricultural implement|
    DE102019119943A1|2019-07-24|2021-01-28|Claas Selbstfahrende Erntemaschinen Gmbh|Whetstone and method of grinding|
    法律状态:
    2017-12-13| FG| Patent granted|Effective date: 20170914 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102015120564.5A|DE102015120564A1|2015-11-26|2015-11-26|Device for detecting the sharpness of cutting edges of chopping knives of a chopper drum of a forage harvester|
    DE102015120564.5|2015-11-26|
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