• 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:
    A device for determining the sharpness of chopping knives (48) movable with respect to a counter-knife (38) comprises a sensor which directly or indirectly senses the cutting forces in action and an evaluation device (46 ) connected to the sensor. The evaluation device (46) integrates the measurement values of the sensor over time in order to generate information concerning the cutting edge of the chopping knives (48).
    公开号:BE1019626A3
    申请号:E2009/0710
    申请日:2009-11-18
    公开日:2012-09-04
    发明作者:Martin Schaefer；Folker Beck
    申请人:Deere & Co；
    IPC主号:
    专利说明:

    DESCRIPTION
    The invention relates to a device and a method for determining the cutting edge of mobile chopping knives with respect to a counter knife, with a sensor for gripping a knife. size depending on the cutting force and an evaluation device connected to the sensor
    State of the art
    For the forage harvesters, in addition to the distance between the chopping knives and the counter knife, the cutting edge of the chopping knives is a decisive quantity for the quality of the cutting and the power to be applied for the cutting, the cutting force. cutting significantly increasing in the case of blunt chopping knives. Typically, the chopper operator recognizes cutting noises, rotational speed of the drive motor or chopping quality when sharpening is needed to sharpen the chopping blades. In doing so, it must be considered disadvantageous that the cutting edge detection of the chopping knives is subject to subjective influences and evaluations by the operator and is therefore not very precise. Since the cutting edge state of the chopping knives is not exactly known at the beginning of the grinding cycle, the determination of the grinding time is problematic, so that in many cases one grinds too much or too little material chopping knives, which in the first case leads to unnecessarily high wear and in the second case to an insufficient cutting edge of the chopping knives.
    In order to improve the sharpness determination accuracy and to be able to automatically trigger sharpening, various procedures have been described:
    In the document DE 19 903 153 C1, it is proposed to measure the forces exerted by the hashing knives in the radial and tangential direction on the counter-knife and to form the quotient thereof, which represents a measurement of the cutting edge of the cutting knives. hash.
    According to DE 10 235 919 A1, the acceleration of the counter-knife is recorded and a frequency analysis is carried out. Using the harmonic spectrum, we can see if the hash knives are still sharp enough or not.
    Furthermore, it is proposed in the document DE 4 133 043 A1 to enter for a cutting machine the number of cutting processes and to start sharpening when a certain number of cutting processes is achieved.
    Finally, the document US 2007/0 209 344 A1 describes a lawnmower for which the driving power of the cutting spindle is measured. When it exceeds a certain threshold value, the operator is warned that he must perform a sharpening.
    It is considered disadvantageous in the state of the art that the procedures based on cutting angle acquisition according to DE 19 903 153 C1 and DE 10 235 919 A1 do not always work in a sufficiently precise manner. cutting not only depends on the cutting edge of the chopping knives and their spacing relative to the counter knife, but also the mechanical characteristics of the chopped crop and its flow. Direct entry of the number of cutting processes according to DE 4 133 043 A1 is not possible for a forage harvester, while a capture of the drive power according to the document US 2007/0 209 344 Al does not Nor would it lead to sufficiently precise measured values because of the influences of the characteristics of the product to be chopped and the distance between the counter knife and the chopping knives.
    Goal
    It is considered that the problem underlying the invention is to provide a device for determining the cutting edge of hash knives improved vis-à-vis the state of the art.
    Solution
    This problem is solved according to the invention by the teaching of claims 1 and 16, the other claims giving features which improve the solution advantageously.
    At each cutting process of a chopping knife, forces are exerted on the counter-knife, which leads to the chopping of the crop, but also to the wear and blunting of the chopping knife. The determining factors for the wear of the chopping knives are the magnitude of the cutting forces or the cutting energy, as well as the number of cutting processes performed by the chopping knife. The basic idea of the present invention is that the wear of the knives correlates with the integral time of the cutting forces and the cutting energy. That is why a size dependent on the cutting forces acting during the chopping of the crop is measured by a sensor and a signal dependent on the measured quantity is integrated over time by an evaluation device in order to generate information concerning the cutting edge. chopping knives.
    The generated information may for a preferred embodiment of the invention be used to determine a sharpening time and / or a number of sharpenings with which the hash knives can be brought back to a sharpened state. This embodiment has the advantage that the sharpening can take place at any appropriate time, for example during a road trip and is automatically adapted to the current cutting edge state of the hashing knives.
    The evaluation device calculates the grinding time and / or the number of grindings such that after sharpening a sharpened state of the grinding knives is obtained which corresponds to the state of the grinding knives after the last previous sharpening or at a reference sharpening state.
    In order to take into account crop characteristics or other influences, the grinding time or the number of cycles recommended by the evaluation device may be influenced in plus or minus by a correction factor that can be introduced into the machine. the evaluation device.
    For another embodiment, the evaluation device can compare the information obtained from the point of view of the cutting edge of the hash cutters with a threshold value, so that for a cutting edge of the hashing knives there is less than this. it can automatically trigger a sharpening in that it informs the operator accordingly and / or automatically activates the sharpening device, after the crop flow has been interrupted by the operator or forcibly.
    Preferably, the cutting forces are determined by a measurement of the vibrations. A single vibration sensor, which is sensitive in the direction of the active cutting forces, can be used, or at least two sensitive vibration sensors are used in two different directions, for example orthogonal directions. In the second case, the resulting cutting forces are determined in that the signals assigned to the different directions are superimposed so that the resulting signal is a measurement of the vibrations extending in the cutting direction. For this purpose, the signals corresponding to the different directions can be added vectorially in that they are squared, the squares are added and the square root is finally drawn. Instead of a vibration measurement, the active cutting forces can however also be gripped by force sensors, which are for example arranged between the counter-blade and the counter-blade cutting bench supporting the counter-blade at chassis of the forage harvester.
    The vibration sensor or vibration sensors may be mounted directly on the counter-knife or on the counter-blade cutting bench or at any other point on the forage harvester, where vibration generated during the cutting process may be seized, for example at the chopping drum bearings.
    The signals from the sensors are preferably filtered before integration, in order to eliminate disturbing influences as much as possible. Filtering frequency limits can be preset fixed or variable. A spectral analysis of the vibrations generated by the chopping knives can be performed during the design of the evaluation device or automatically by it during operation, in order to be able to define the limit frequencies as closely as possible, so that the filter does not allow as much as possible the vibration signals generated by the chopping knives.
    In addition, the envelope curve of the signal can be taken into account during the evaluation, in order to determine the shock content of the cutting process. For this purpose, it is possible in particular to determine the crest factor of the envelope curve. This is then integrated by the evaluation device in order to obtain information on the particularly hard shocks to the chopping knives, which give rise to a particular wear of the chopping knives and thus influence the cutting edge of the chopping knives. . Alternatively or additionally, the cutting energy is determined in that the thickness of the cut crop mat is multiplied by the cutting force, the product then being integrated as a function of time. For these two evaluation methods, it is possible to perform an order analysis, that is to say a consideration of the rotational speed of the hash drum, in order to be able to affect the measured signals to cutting processes. individual.
    For a preferred embodiment of the invention, a characteristic value is added or integrated over time, which is proportional to the respective wear speed of the knives and is formed by means of a spectral decomposition of the measured vibrations. , generated by the cutting process. For this purpose, the amplitudes of the vibrations measured by the vibration sensor are measured in a narrow band around the cutting frequency of each knife (i.e. the number of cutting processes performed by the knife in one unit of time) as well as the amplitudes for the integer (harmonic) multiples of the cutting frequency. For this purpose, it is possible to carry out (over the time period) a filtration of the vibration sensor signals, or a Fourier transformation is carried out in order to transform and analyze the signals in the frequency range. The evoked amplitudes can be weighted and summed to calculate the characteristic value, that is, a weighting factor is assigned to the fundamental frequency and each harmonic, by which the corresponding amplitude is multiplied, and the Individual products are then added to determine the characteristic value. In addition to the pure amplitude spectrum, spectra derived from it also come into play, such as the power spectral density (PSD), which indicates the distribution of the signal energy over the frequencies. contained), the logarithmic amplitudes or a logarithmic power spectral density.
    Finally, a characteristic curve can be stored in the evaluation device, with which it compensates for a non-linear evolution between the time integral of the measured signal of the sensor and the cutting edge of the hashing knives.
    Examples of realization
    The drawings show several embodiments of the invention described in more detail below. The drawings show: FIG. 1, a side view and a schematic representation of a harvesting machine with which the device according to the invention is usable, FIG. 2, a schematic representation of a device according to the invention, FIG. 3, a schematic representation of the hash drum with other possible attachment points of the vibration sensors, FIG. 4, a first embodiment of an integration device for determining the integral of the cutting forces, FIG. 5, a second embodiment of an integration device for the determination of the integral of the cutting forces, FIG. 6, a third embodiment of an integration device for the determination of the 7, a fourth embodiment of an integrating device for determining the integral of the cutting forces, FIG. embodiment of an integrating device for determining the integral of the cutting forces, Fig. 9, a sixth embodiment of an integrating device for determining the integral of the cutting forces , and FIG. 10, a seventh embodiment of an integration device for the determination of the integral of the cutting forces, and FIG. 11, a flow diagram, in which the device evaluation device operates. .
    A harvesting machine 10 shown in Figure 1 of the self-propelled pick-up type is mounted on a frame 12, which is supported by front and rear wheels 14 and 16. The control of the harvesting machine 10 is from a cab of 18, from which we can see a harvest collection device 20 in the form of a collector. The crop collected on the soil by means of the crop collection device 20, for example grass or the like, is fed to a chopping drum 22 equipped with chopping knives 48, which chops it into small pieces and the The harvest leaves the harvesting machine 10 to a trailer traveling beside it via a rotary extraction well 26. Between the chopper 22 and the transport device 24 is a secondary chopping device 28, through which the crop to be transported is brought tangentially to the conveying device 24. Between the crop pickup device 20 and the chopper drum 22, the crop is transported by lower pre-pressing rolls 30, 32 and upper pre-pressing rolls 34, 36.
    Reference is now made to FIG. 2, in which it can be seen that the chopping knives 48 distributed around the periphery of the chopper drum 22 cooperate with a counter knife 38 for chopping the crop. The counter-knife 38 is provided with an adjustment device 40 (see FIG. 2), which is designed to bring the counter knife 38 of the chopper 22 closer to or away from the horizontal direction. It serves to adjust the size of the set of chopped off. A vibration sensor 42 is disposed at both lateral ends of a counter knife cutting bench 58 supporting the counter knife 38 on the frame 12.
    The vibration sensor 42 attached to the cutter cutter bench 38 is an element of a chopping knife cutting device 48, which is shown as a whole in Fig. 2. The vibration sensor 42 comprises a mass 52 attached to springs 50, whose position is detectable by a position sensor 54, which operates for example capacitively or inductively. When the counter-knife 38 is accelerated, the housing 56 of the vibration sensor 42 which is attached thereto, preferably removably, is also accelerated, while the mass 52 remains stationary first because of its inertia and does not puts that with delayed movement due to its connection to the springs 50. The relative movement between the housing 56 and the mass 52 is highlighted by the position sensor 54; in Fig. 2, the vibration sensor 42 detects vibrations of the counter knife cutter 58 in a direction extending downwardly and forwards from the adjacent surface of the chopper drum 22, the springs 50 extending obliquely downwards and forwards. The sensitive direction of the vibration sensor 42 therefore extends approximately parallel to the diagonals of the counter knife 38. It is expected that the sensitive direction of the vibration sensor 42 will extend parallel to the direction in which the cutting forces are acting on. the counter-knife 38 during the chopping of the crop, so that the vibration sensor 42 provides information about these cutting forces. The position of the vibration sensor 42 or at least the springs 50 and the mass 52 can be adjustable, in particular can be rotated about the longitudinal axis of the counter knife cutter 58 or an axis parallel thereto. ci, in order to align the sensitive direction of the vibration sensor 42 as accurately as possible on the direction of the cutting forces.
    As indicated in the drawing, the vibration sensors 42, 42 'may be disposed at both ends of the counter knife cutter 58 (or at any intermediate positions). The output signals of the position sensors 54 of the vibration sensors 42, 42 'are sent to an evaluation device 46, which could for example be arranged in the driver's cab 18. The evaluation device 46 comprises an amplifier 44 , an analog / digital converter 62, an integration device 64 and an evaluation circuit 66. The amplifier 44 amplifies the incoming signals of the vibration sensors 42 and, if appropriate, 42 ', while the analog / digital converter 62 converts the output signals of the amplifier into digital values. The integrator 64 and the evaluation circuit 66 are therefore made as digital circuits in the form of a microprocessor 68, although they can also be embodied in one embodiment as an analog circuit or discrete digital circuit.
    Figure 3 shows alternative mounting possibilities and embodiments for vibration sensors 42 "and 42" '. A possibility of mounting is on the surface of the counter-knife 28 spaced apart from the chopper drum 22, in the middle of which the vibration sensor 42 "is fixed to a support 60. Another mounting possibility for the vibration sensor 42" ' is located on a bearing 74, with which the chopper drum 22 is supported so as to allow rotation on the frame 12. As shown in FIG. 3, the vibration sensors 42 "and 42" 'respectively comprise two masses 52 and position sensors 54 whose sensitive directions are mutually orthogonal, although they may also form another angle, different from 0 ° and 180 °. Such vibration sensors with two masses 52 respectively and position sensors 54 with orthogonal (or any other angle) sensitive directions can also be attached to the counter knife cutter 58, as shown in FIG. 2. In general, the cutting edge of the chopping blades 48 comprises only one vibration sensor 42, 42 ', 42 "or 42"', although two or more vibration sensors 42, 42 ', 42 "or 42 "'may also be present, in order to improve the accuracy and to provide sufficient redundancy in case of failure of one of the vibration sensors 42, 42', 42" or 42 "'. During the evaluation, the signals of the two position sensors 54 of a vibration sensor 42 "or 42" 'can be superimposed vectorially, in that the signals x, y of the vibration sensors are squared and summed and that the square root is finally drawn: (x2 + y2) 172.
    FIG. 4 shows a first embodiment of an integration device 64 for determining the integral of the cutting forces, for which the signals of the vibration sensors 42, 42 ', 42 "or 42"' are The average of the signals is then calculated using a mean value calculator 78, which can be done in a manner known per se with the aid of a mean value calculator 78. a rectifier and a capacitor. Finally, the mean values of the signals are integrated over time in an integrator 80.
    FIG. 5 shows a second embodiment of an integration device 64 for determining the integral of the cutting forces, for which the signals of the vibration sensors 42, 42 ', 42 "or 42"' are The Fourier transform signals are then optionally sent through a bandpass filter 84. Finally, the average values of the signals after Fourier transform are integrated over time into a signal. integrator 86.
    FIG. 6 shows a third embodiment of an integration device 64 for determining the integral of the cutting forces, for which the signals of the vibration sensors 42, 42 ', 42 "or 42"' are Optionally, they are sent through a bandpass filter 76. They are then sent to a converter 88, which converts their time allocation into an angular assignment, based on rotational speed information about the rotational speed of the drum. 22, which is provided via a CAN bus. These signals are then sent to a Fourier transforming device 90. Fourier transform signals are then optionally sent through an additional bandpass filter 92. Finally, the average values of the signals after Fourier transform are integrated into the time and frequency in an integrator 86.
    FIG. 7 shows a fourth embodiment of an integration device 64 for determining the integral of the cutting forces, for which the signals of the vibration sensors 42, 42 ', 42 "or 42"' are Optionally, they are sent through a bandpass filter 76. They are then sent to a converter 88, which converts their time allocation into an angular assignment, based on rotational speed information about the rotational speed of the drum. 22, which is provided via a CAN bus. These signals are sent to a Hilbert transformation device to extract the envelope curve and then to a Fourier transform device 90. Fourier transform signals are then optionally sent through an additional bandpass filter 92. Finally, the average values of the signals after Fourier transformation are integrated in time and frequency in an integrator 86. The integral is a measure of the shocks to which the hashing knives 48 are exposed.
    FIG. 8 shows a fifth embodiment of an integration device 64 for determining the integral of the cutting forces, for which the signals of the vibration sensors 42, 42 ', 42 "or 42"' are first sent through a bandpass filter 76. They are then sent to a first integrator 94. The integration of the signals of the vibration sensors 42, 42 ', 42 "or 42"' gives a speed, the sensors vibration 42, 42 ', 42 "or 42"' measuring accelerations on their side. This velocity is then squared in a square elevator 96, to determine the kinetic energy, which is finally integrated in time in another integrator 98.
    FIG. 9 shows a sixth embodiment of an integration device 64 for determining the integral of the cutting forces, for which the signals of the vibration sensors 42, 42 ', 42 "or 42"' are multiplied by a size h and then integrated in time in an integrator 114. The quantity h corresponds to the thickness of the cut crop belt layer and is for example measured by means of a sensor which measures the distance between the rollers 34, 36 and the lower pre-pressing rollers 30, 32. In doing so, the cutting energy obtained by multiplying the path h (layer thickness) by the cutting force is determined. The latter is measured by means of the proportional acceleration measured by the vibration sensors 42, 42 ', 42 "or 42"'.
    In Figure 10 is shown a seventh embodiment of an integration device 64 for determining the integral of the cutting forces. In a similar manner to the embodiment according to FIG. 6, the signals of the vibration sensors 42, 42 ', 42 "or 42"' are first sent as an option through a band-pass filter 76. They are then sent to a converter 88, which converts their time allocation to an angular assignment, based on rotational speed information about the rotational speed of the hash drum 22, which is supplied to it via a CAN bus.
    These signals are then sent to a Fourier transforming device 90. A computing device 116 then has a signal x (f) which reproduces the respective amplitude x of the vibrations measured for the frequencies f. The cutting or knife cutting frequency, that is to say the number of cutting processes performed by each of the chopping knives 48 per time unit, is designated by flf while the multiples equal to 2, 3 or n times the cutoff frequency (i.e., higher harmonics) are designated f2, f3 and fn. In the computing device 116, the amplitude x3 for the cutting frequency ft is multiplied by a weighting factor a3. In addition, the amplitude x2 for the second harmonic h of the cutting frequency is multiplied by a weighting factor a2 and added, just as the amplitude x3 for the third harmonic h of the cutting frequency is multiplied by a factor weighting a3 and added. This totalization is up to an upper harmonic n, which may for example be the 5th or the 12th. In this way, a characteristic value K is determined in the computing device 116 which is then integrated over time in an integrator 118 to determine the integral of the cutting forces.
    In the following, the operating mode of the evaluation device 46 is explained using the flow diagram reproduced in FIG. 10. After starting in step 100, the integrator 64 is set to zero. next step 102, so that the integral of the cutting forces stored therein is canceled. In the next step 104, the incoming vibration signals of the vibration sensors 42, 42 'are integrated in the integration device 64, for example as shown and previously described using one or more or all Figures 4 to 9.
    Step 106 follows, in which the microprocessor 68 asks whether an input has taken place via a control input device of the operator 70, which is preferably in the driver's cab 18, according to which a calculation of the sharpening time must be performed. If it is not the case, the step 104 follows again, while otherwise the step 108 is executed, in which the signals integrated by the integration device 64 are used by the evaluation circuit 66 to calculate a suitable grinding time, which makes it possible to restore an appropriate cutting edge of the chopping knives 48 by means of a sharpening device 72. It is proposed later on the possibility of carrying out the grinding at an appropriate time, for example when traveling on a road or during a harvest break and automatically calculating the appropriate grinding time. In doing so, the results of the integration devices 64 may be used in one or more or all of Figures 4 to 10 taken individually or in any combination; in step 108, for example, the integrated signal of FIGS. 4 to 10 can be used for calculating the grinding time which leads to the longest grinding time or an average of the results of the grinding devices is used. integration 64 of Figures 4 to 10.
    On a case-by-case basis, it is possible to calculate how long a wheel of the grinding device 72 is to be moved from one end to the other over the width of the grinding drum 22 or the number of movements over the width of the drum is determined hash 22, based on a fixed, predefined motion speed. A variable grinding time can also be selected over the width of the grinding drum 22 to account for greater or lesser wear in the center of the grinding drum 22 relative to the outer sides. For this purpose, reference is made to DE 10 035 742 A1, the publication of which is incorporated by reference into the present documents. On the other hand, a correction factor can be introduced via the operator input device 70 to influence up or down the recommended number of sharpenings or grinding times and take into account, for example, characteristics of the material such as the hardness of the harvest or the quality of the chopping knives 48. In addition, it is possible to compensate with a calibration curve stored in the evaluation circuit 66 a non-linear dependence between the measured signal of the vibration sensor 42 and the cutting edge of the chopping knives 48. Finally, it is taken into account in step 108 of the cutting edge that the chopping knives 48 must reach after sharpening. This information is taken from a memory which has been loaded in a previous flow diagram of FIG. 3 with a value for the vibration sensor signals 42 immediately after sharpening (see step 112). As a variant, information on the cutting edge to be achieved can be predefined in a fixed and recorded manner.
    If the microprocessor 68 should not be able during step 108 to simultaneously integrate other cutting force signals (step 104), the signals occurring during the period required for step 108 can be statistically interpolated. In step 110 then takes place a sharpening using the sharpening device 72, which can be controlled automatically by the evaluation device 46. In addition, the number and / or the duration of the sharpenings to be performed in total and grindings made or missing are displayed on the operator input device 70. Step 110 is followed by step 112, in which, at a subsequent harvest, a force signal of cut is entered for a long enough time and stored. This stored value is required in the next step 108. Step 102 then follows again.
    权利要求:
    Claims (16)
    [1]
    1. Device for determining the cutting edge of chopping knives (48) movable with respect to a counter knife (38), with a sensor for capturing a quantity which is a function of the cutting force and a device for evaluation (46) connected to the sensor, characterized in that the sensor is designed to capture a quantity dependent on the active cutting forces and in that the evaluation device (46) can be used to integrate in time signals based on the measurement values of the sensor, in order to generate information regarding the cutting edge of the hash knives (48).
    [2]
    2. Device according to claim 1, characterized in that the evaluation device (46) is designed to determine on the basis of information obtained about the cutting edge of the hashing knives (48) a sharpening time and / or a number sharpening, with which the chopping knives (48) can be brought back to a sharpened state.
    [3]
    3. Device according to claim 2, characterized in that the evaluation device (46) is adapted to use as sharp state the state of the chopping blades (48) after the last sharpening or a state of reference sharpening.
    [4]
    4. Device according to claim 2 or 3, characterized in that a correction factor can be introduced for the grinding time and / or the number of grindings in the evaluation device (46).
    [5]
    5. Device according to one of claims 1 to 4, characterized in that the sensor comprises at least one vibration sensor (42, 42 ', 42 ", 42"').
    [6]
    Device according to Claim 5, characterized in that the vibration sensor (42, 42 ') is sensitive in the direction of the cutting forces and / or in that at least one vibration sensor (42 ", 42") ') sensitive in different directions, in particular mutually orthogonal is present, whose signals to be assigned to the two directions are superimposed vectorially so that the resulting signal is a measure of vibration extending in the cutting direction.
    [7]
    7. Device according to claim 5 or 6, characterized in that the vibration sensor (42, 42 ', 42 ", 42"') is mounted on the counter-knife (38) and / or the counter-cutting table. -couteau (58) and / or on a bearing (74) of the hash drum (22).
    [8]
    8. Device according to one of claims 1 to 7, characterized in that the evaluation device (46) can be used to filter the sensor signals, the filtering frequency limits being predefined fixed or variable.
    [9]
    9. Device according to one of claims 1 to 8, characterized in that the evaluation device (46) can be used to determine the shock content of the cutting process using the envelope curve of the sensor signals. , in particular the crest factor.
    [10]
    10. Device according to one of claims there 9, characterized in that the evaluation device (46) can be used to determine a cutting energy using the sensor signals and a measured layer thickness of cut harvest mats.
    [11]
    11. Device according to one of claims 1 to 10, characterized in that the evaluation device (46) can be used to perform an order analysis of the signals measured by the sensor.
    [12]
    Device according to one of Claims 5 to 11, characterized in that the evaluation device (46) can be used to frequency-test the vibrations measured by the at least one vibration sensor (42, 42 ', 42 ", 42"'), for example by filtering or Fourier transform, in order to measure the amplitudes of the vibrations at the cutting frequency and its harmonics and on the basis of these to calculate a characteristic value to be integrated in time.
    [13]
    Device according to Claim 12, characterized in that the evaluating device can be used for weighting the amplitudes of the section frequency and its harmonics or for determining the spectral power density in order to calculate the value. feature.
    [14]
    14. Device according to one of claims 1 to 13, characterized in that a calibration curve is stored in the evaluation device (46), with which a nonlinear evolution is compensated between the signal measured by the sensor and the cutting edge of the hash knife (48).
    [15]
    15. Harvesting machine (10), in particular a chopper, with a device according to one of the preceding claims.
    [16]
    16. A method of determining the cutting edge of chopping knives (48) movable against a counter knife (38), with a sensor for capturing a size dependent on the cutting force and a device for evaluation (46) connected to the sensor, characterized in that the sensor measures a magnitude dependent on the cutting forces in action and in that the evaluation device (46) integrates over time the signals based on the measured values of the sensor for generating information about the cutting edge of the chopping blades (48).
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    同族专利:
    公开号 | 公开日
    US8353200B2|2013-01-15|
    DE102009029675A1|2010-05-27|
    EA017182B1|2012-10-30|
    US20100126258A1|2010-05-27|
    EA200901392A1|2010-06-30|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102008044055|2008-11-25|
    DE102008044055|2008-11-25|
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