Device and method for determining the longitudinal elongation and average speed of a belt and for determining the speed of at least one pulley

Abstract

The invention relates to a device for determining the longitudinal elongation and average speed of a belt and for determining the speed of at least one pulley. At least one marking is arranged in a load strand and in an idle strand on the circumference of the belt, respectively, wherein an evaluation and control unit is configured to determine the longitudinal elongation of the belt based on the average speed of the belt, the difference between the run times of two successive markings in both the load strand and the idle strand, and the determined measurement spacing of the markings in both the load strand and the idle strand, and the reference spacing as the average value from the determined measurement spacings, and to determine the tension and tension differences in the load strand of the belt using the evaluation and control unit by means of the spring rate assigned to the belt and stored in the evaluation and control unit and the spacing differences of the markings in the load strand. The evaluation and control unit is further configured to determine the slip between the belt and the pulley based on the ratio of the average speeds determined from the belt and the pulley.

Description

Technical Field

[0001] The present invention relates to an apparatus for determining the longitudinal elongation and average speed of a belt and for determining the speed of at least one pulley, and to an attachment for an agricultural machine.

[0002] The present invention also relates to a method for determining the longitudinal elongation and average speed of a belt and for determining the speed of at least one pulley, and to the use of the method according to the invention. Background Technology

[0003] Methods and apparatuses involving belts and drive mechanisms for belts are known in principle from the prior art. In this case, the drive mechanism has multiple pulleys, such as two pulleys. The belt is designed to rotate circumferentially in a loop and at least partially surround the pulleys. Furthermore, the belt can be driven circumferentially by the drive mechanism. The belt is preferably a transmission belt for transmitting tension. In this case, the belt is often subjected to pretension, effective force, centrifugal force, and / or bending.

[0004] The service life of a belt is determined at least in part by its elongation, particularly its circumferential elongation. The cycle rate of belt movement and / or the power required to drive the belt can provide information about the load on the belt. Belt elongation is related to a decrease in belt pretension. To some extent, this decrease in pretension can be compensated for by a clamping system that can be used selectively. However, belt drives without clamping systems are particularly susceptible to the effects of a decrease in pretension, which manifests itself as a greater immediate slippage of the belt relative to the pulleys, especially in friction-engaged belt drives. This increases belt temperature and belt wear.

[0005] The transmission belt is known to be a toothed belt, such as a flat belt, a V-belt, or a V-ribbed belt.

[0006] DE 102018215478 A1 discloses a system for determining the longitudinal elongation of a belt. The system includes a belt, a drive unit, a transmitter, and an evaluation unit. Two ferromagnetic markers arranged at a predetermined spacing are embedded in the belt. The transmitter is designed to generate a reference alternating field, and each of the two markers changes the reference alternating field as the corresponding markers move through it with the belt's rotation. The change in the reference alternating field resulting from the corresponding interaction between the markers and the reference alternating field can be captured by the transmitter. The evaluation unit is designed to determine the longitudinal elongation of the belt based on the reference spacing of the ferromagnetic markers, the belt speed, a first capture time, and a second capture time. A particularly disadvantageous aspect is that only one measurement can be performed per belt revolution. This can adversely affect measurement accuracy. Simultaneous sliding measurements are not possible with this system because the rotational speeds of the drive rotor and the pulleys are not monitored. This requires additional measuring equipment, which negatively impacts the complexity and cost of the measurement system. Furthermore, pre-calibration of the system is required when the belt is unloaded, by limiting the reference spacing by adapting the spacing of the transmitters to the spacing of the markers. This requires additional manual adjustment work, and if the spacing between the sensors changes, for example due to vibration, it increases the risk of inaccurate measurements.

[0007] DE 20 2016 008 121 U1 discloses a belt drive consisting of pulleys, a belt, and a monitoring device. Marks are applied to both the belt and the pulleys. A signal is triggered when the marks on the belt and the drive pulley are aligned with each other. The marks used to identify the position can be based on various sensor technologies, such as those based on optical effects, inductive effects, capacitive effects, or magnetic effects.

[0008] The monitoring described herein can be used in particular to monitor the number of revolutions of toothed belts or timing belts during their service life.

[0009] A similar method is described in DE 10 2019 206 169 A1, which describes a method for monitoring belt drives. Here, the belt has at least one first mark and is assigned at least one first sensor element to the belt. Furthermore, the rotor of the drive motor has additional marks and is assigned a sensor element to the drive motor. Specifically, this monitoring method is used to monitor skipped teeth in a belt drive that is visually imperceptible for use in steering systems by detecting angular misalignment between the belt and the pulley.

[0010] The disadvantage of the above instructions is that there is no complete monitoring of the belt drive system, which may require parallel force measurement. Summary of the Invention

[0011] question

[0012] The problem addressed by this invention is to provide an apparatus and method for measuring force and slippage on a drive belt using a general-purpose sensor system. In particular, the problem lies in implementing drive belt slippage control using this apparatus and / or method. Furthermore, the information generated regarding power transmission and drive belt slippage should be used to identify signs of roughness or wear in the drive system or the machine driven by it at an early stage, before component failure begins.

[0013] Solution to the problem

[0014] The solution to this problem is achieved through a device according to the invention, an attachment for an agricultural machine, and a method according to the invention. The invention also discloses the use of the method according to the invention.

[0015] Advantages of the present invention

[0016] The apparatus according to the invention is provided for determining the longitudinal elongation and average speed of a belt, and for determining the speed of at least one pulley. Here, the apparatus comprises a belt having a predetermined longitudinal stiffness, wherein the length of the belt is constant and independent of the operating state. The belt has at least a first marking portion, a second marking portion, a third marking portion, and a fourth marking portion, wherein the first and second marking portions are designed to form a first marking portion pair, and the third and fourth marking portions are designed to form a second marking portion pair.

[0017] Assigning markers to marker pairs can make it possible, for example, to monitor the status of segmented monitoring strips.

[0018] A drive device is also provided, comprising: at least two pulleys of a predetermined diameter arranged at an axial distance from each other, and a belt at least partially surrounding the at least two pulleys; and a transmission device including at least two external readers and an evaluation and control unit suitable for controlling the rotational speed and / or torque of the drive device, wherein, when the belt rotates, a signal identifiable at the external readers can be generated by each marker and can be output to the evaluation and control unit.

[0019] Each tag in the tag pair can also emit an identification identifier, whereby the emitted signal captured by one of the external readers can be assigned to each individual tag. By assigning signals to individual tag segments, it is advantageous to perform the signal assignment of the tag segments to the tag pair first. Accordingly, each tag in the tag pair can be detected and identified by each external reader.

[0020] The belt is designed to rotate circumferentially in a loop and is driven circumferentially by a drive device. The belt has load-carrying strands (also called load strands) and unloaded strands arranged opposite to the load strands.

[0021] In other words, when a belt transmits power, the force ratio in the belt strands changes. The power introduced into the loaded strands of the belt by the pulley connected to the drive motor and transmitted causes an increase in the force in the loaded strands, and this increase in force causes the loaded strands of the belt to stretch, depending on the belt stiffness. The increase in force in the loaded strands causes an equal amount of force to decrease in the unloaded strands, and the shortening of the unloaded strands depends on the belt stiffness. This condition applies if the unloaded strands have a preload of >0 Newtons. Therefore, even during operation under dynamic loads, the total force in the belt and the length of the belt remain constant.

[0022] In the absence of power transmission, the marking parts of the belt are arranged one after the other in the circumferential direction at a predetermined reference spacing.

[0023] The no-load state is understood as a static state where no power is being transmitted through the belt. In this state, the belt may already be statically pre-tensioned.

[0024] The reference spacing between the markings of the first marking pair is designed to become a first measuring spacing when the belt transmits power, wherein the reference spacing between the markings of the second marking pair is designed to become a second measuring spacing when the belt transmits power.

[0025] As mentioned earlier, power transmission causes an increase in force and elongation in the loaded strands, and a decrease in force and shortening in the unloaded strands.

[0026] In other words, according to Hooke's Law, there is a proportional relationship between the force changes and lengths in the loaded and unloaded strands. Therefore, even during operation under dynamic load, the total force in the belt and the length of the belt remain constant.

[0027] In addition, at least one of the pulleys has at least one marking portion, wherein when the pulley rotates, the marking portion of the pulley is designed to generate an identifiable signal at one of the external readers and output it to the evaluation and control unit.

[0028] The same applies to the marking section of the pulley. As described at the beginning, in addition to the signal used to assign the signal to the marking section, the identification identifier can also be transmitted to an external reader.

[0029] The transmission device is arranged not to contact the belt, such that the markings on the belt and the markings on the pulley can be successively guided through the transmission device. The evaluation and control unit is configured to determine the corresponding running time based on two signals under each condition. In other words, the running time can be determined as the time difference between the two captured signals of the markings.

[0030] The evaluation and control unit is configured to determine the average speed of the belt based on the travel time of one of the marked portions of the determined marked portion pair over the circumferential length during one revolution of the belt. Furthermore, the evaluation and control unit is configured to determine the speed of the pulley based on the travel time of the marked portion of the determined pulley.

[0031] As mentioned at the beginning, the length of the belt is predetermined and constant. Although the length of the belt strands may vary in segments due to dynamic load stress, the total length of the belt remains constant due to the explanatory relationships between the force balances throughout the belt drive. Therefore, the average speed of the belt can be determined by the running time of the determined markings during belt rotation and the predetermined belt length.

[0032] The pulley also has a predetermined diameter. The speed of the pulley can be determined in the same way as explained in the example of the belt.

[0033] A belt consists of load-carrying strands and unloaded strands (also called unloaded strands). The load-carrying and / or unloaded strands extend over the area between the two pulleys. In the case of a belt drive with two pulleys, the load-carrying and unloaded strands are arranged opposite each other and have the same strand length. When no power is being transmitted through the belt drive, the load-carrying and unloaded strands have the same force ratio. This is essentially due to static pretension, by which the drive belt is tensioned between the pulleys. The static pretension of the belt is necessary for reliable power transmission and can be selected and adjusted according to the power transmission requirements of the belt.

[0034] According to one aspect of the device of the invention, when the belt is not transmitting power, at least one pair of marking portions formed by the marking portions is arranged accordingly on the circumference of the belt in the loaded strands and the unloaded strands. If one of the marking portion pairs is arranged in the loaded strand and the other in the unloaded strand, assigning the marking portions to the marking portion pair can advantageously make it possible to monitor the state of the loaded and unloaded strands of the belt.

[0035] It has proven particularly advantageous that, according to the invention, both the loaded and unloaded strands have at least one pair of marking portions, which are formed by the marking portions when the belt is not being powered. In this way, information relating to the loaded and unloaded strands can be permanently provided and compared.

[0036] Furthermore, the evaluation and control unit is configured to determine the longitudinal elongation of the belt based on the average speed of the belt, the difference between the running times of two consecutive markers in a pair of markers in both the loaded and unloaded strands of the belt, the measured spacing between the markers in the pair of markers in both the loaded and unloaded strands determined therefrom, and a reference spacing as the average value of the determined measured spacing.

[0037] In other words, the evaluation and control unit can determine the longitudinal elongation of the belt. For this purpose, an external reader can capture a signal as the marker passes. Due to the predetermined circumferential length of the belt stored in the evaluation and control unit, the average belt speed can be determined based on the travel time between the first signal and the second signal at the external reader after the marker has rotated one revolution of the belt. Furthermore, the evaluation and control unit is configured to determine the measured spacing between the markers of the marker pair in both the loaded and unloaded strands of the belt based on the travel time of two consecutive markers in the marker pair. In other words, the measured spacing corresponds to the spacing between the markers of the marker pair during dynamic operation. Once the belt transmits power, the spacing between the markers of the marker pair changes in such a way that the measured spacing of the marker pair in the loaded strand increases, while the measured spacing of the marker pair in the unloaded strand decreases by the same amount. Therefore, an increase in the measured spacing of the marker pair in the loaded strand always requires an equal decrease in the measured spacing of the marker pair in the unloaded strand.

[0038] Due to the correlation of the variation in the measured spacing of the marker pairs in the described loaded and unloaded strands, the reference spacing can be determined as the average value of the determined measured spacing. The longitudinal elongation of the belt can be determined using the evaluation and control unit, taking into account the average belt speed, the determined measured spacing between the marker pairs in both the loaded and unloaded strands, and the reference spacing.

[0039] The evaluation and control unit is designed to determine the tension and tension difference in the load strands of the belt by assigning the spring stiffness to the belt and storing it in the evaluation and control unit, as well as the spacing difference between the markers of the marker pairs in the load strands of the belt. Information related to the spring stiffness can also be provided, for example, by a scannable barcode on the belt.

[0040] In other words, the tension difference in the load strands can be determined by multiplying the spring stiffness of the belt by the spacing difference between the marked portions of the marked portion pair assigned to the load strands. Here, the tension difference can correspond to the force component added to the static pretension by the drive power introduced into the belt drive via the drive pulley. The total force present in the load strands can be determined from the sum of the static pretension and the tension difference.

[0041] Furthermore, the evaluation and control unit is configured to determine slippage between the belt and pulleys based on the ratio of the average speed determined according to the belt and pulleys. In other words, the evaluation and control unit can monitor both the speed of the pulleys and the average speed of the belt. The speed difference between the pulleys and the belt indicates slippage between them. Depending on the application, belt slippage may be tolerable or even necessary, especially in friction-engaged drive belts in the form of V-belts or V-ribbed belts. However, excessive slippage can lead to increased wear due to wear or excessively high temperatures. Increased slippage may be caused by the belt pretension being too low to transmit drive power. The described slippage measurement can advantageously provide an early indication that the belt pretension is too low, and this can prevent continued damage or failure of the belt.

[0042] Overall, it has proven particularly advantageous that the longitudinal elongation of the belt and the average speed of the belt and pulleys can be determined using only a single sensor system. In this way, a large number of measurements can be obtained in a particularly cost-effective manner.

[0043] In another aspect of the device according to the invention, the marking portion is designed as a surface acoustic wave (SAW) sensor. SAW sensors are particularly advantageous for belt drives because, in some cases, they can withstand temperatures exceeding 200°C present during belt vulcanization and can operate reliably at high belt speeds due to the low energy requirement for transmitting the sensor protocol. Here, an external reader is assigned to the SAW sensor located on or within the belt and can be, for example, permanently mounted on the machine frame and can be arranged radially or axially spaced from the belt. The external reader can emit an electromagnetic field that provides the SAW sensor with the energy required to transmit the sensor protocol as it passes. The sensor protocol transmitted from the SAW sensor to the external reader can be identified so that, even in the presence of multiple sensors, the sensor protocol can be assigned to each individual sensor.

[0044] In another aspect of the device according to the invention, the tag is designed as a radio frequency identification transponder, or simply an RFID transponder. This can particularly advantageously represent a cost-effective alternative to the aforementioned SAW sensor.

[0045] In another advantageous embodiment of the device according to the invention, the marking portion is designed as a ferromagnetic marking portion. Particularly advantageously, the marking portion can be designed such that ferromagnetic particles are introduced into the elasticity of the belt. In this way, a uniform material distribution can be achieved in the belt, and foreign objects in the form of sensor elements do not weaken or damage the belt.

[0046] According to another aspect of the device of the invention, the driven pulley has at least one marking portion. This can be particularly advantageous if, for example, the rotational speed of a drive motor coupled to the pulley is to be monitored via the marking portion of the pulley. In this way, the rotational speed of the drive motor can be monitored directly, without the need for any additional transmission element connected between the two that would disrupt the measurement results.

[0047] According to another aspect of the device of the invention, one of the external readers is arranged in the inlet region of the belt entering / leaving the pulley, and the other is arranged in the outlet region of the belt. This advantageously ensures that the external readers are assigned to the loaded and unloaded strands in their respective cases. By arranging the external readers directly near the pulley, accurate signal capture can be performed because the belt strands have not yet experienced large vibration amplitudes in this region. Excessive vibration of the belt strands due to variations in the spacing between the external readers and the markers can adversely affect signal capture.

[0048] In another aspect of the device according to the invention, it has proven particularly advantageous that when a predetermined limit value for the speed difference between the belt and pulley stored in the evaluation and control unit is exceeded, the evaluation and control unit is configured to control the drive torque or drive speed in such a way that the speed difference moves within the defined limit value. In other words, the permissible limit value for slippage between the belt and pulley can be stored in the evaluation and control unit. Depending on the number of markings on the belt's marking pairs, the belt speed can be determined at least once per revolution of the belt and compared with or proportionally set to the speed of the pulley. The speed difference or slippage thus determined can then be compared with the stored limit value. If the speed difference between the belt and pulley exceeds the defined limit value, the drive speed or drive torque can be reduced. The speed values ​​of the belt and pulley can be further recorded in the adjusted performance data, and the results can be compared again to see if they meet the defined limit value for slippage. If necessary, further power adjustments can be made to the transmission until the slippage moves within the defined limit value. In this way, increased belt wear due to high temperatures caused by excessive slippage can be advantageously prevented.

[0049] According to another aspect of the device of the invention, the evaluation and control unit is coupled to another measuring device of the machine element. For this purpose, the evaluation and control unit includes a memory for backing up historical sensor data and a memory for backing up historical force distribution data related to the belt. Furthermore, the evaluation and control unit is designed to monitor the historical force distribution data related to the belt within pre-specified limits stored in the memory of the evaluation and control unit, and to take into account historical sensor data related to other machine elements from the memory of the evaluation and control unit, so as to be able to draw conclusions about the wear of machine elements outside the device.

[0050] In other words, the evaluation and control unit includes a memory that, in addition to the aforementioned sensor data related to the device, can also back up additional sensor data related to measuring devices of other machine components. This captured sensor data can be stored in the memory to monitor long-term changes. In particular, it may be very important to combine the additional sensor data from measuring devices of other machine components to account for changes in the force distribution data related to the belt.

[0051] This can be explained using the example of an attachment to agricultural machinery. This attachment could be the cutting unit of a combine harvester. Advantageously, the harvest amount per unit time can be recorded by a measuring device of the cutting unit. For example, the wear of the blades of the belt-driven cutting unit can be identified by comparing force distribution data associated with the belt (which can be determined by the device according to the invention) with the distribution of the harvest amount per unit time of the cutting unit. For example, if the force in the belt increases while the harvest amount decreases, the blades may become dull or damaged, and accordingly, it can be concluded that the blades need to be replaced.

[0052] Another advantageous embodiment provides an attachment for agricultural machinery having at least one means according to the invention for monitoring belt-driven devices. In this way, the aforementioned advantages can be applied to various belt drive systems. In particular, the goal of agricultural machinery is high availability during harvest. Therefore, avoiding wear-related machine failures is especially important, and thus monitoring of belt drives is also particularly relevant.

[0053] Another advantageous embodiment provides a method for determining the longitudinal elongation and average speed of a belt, and for determining the speed of at least one pulley.

[0054] For this purpose, a belt with a predetermined longitudinal stiffness is provided, wherein the length of the belt is constant and independent of the operating conditions.

[0055] The belt has at least a first marking section, a second marking section, a third marking section, and a fourth marking section, wherein the first marking section and the second marking section form a first marking section pair, and the third marking section and the fourth marking section form a second marking section pair. Assigning the marking sections to the marking section pairs makes it possible, for example, to monitor the state of the belt in segments.

[0056] A drive device is also provided, comprising: at least two pulleys of a predetermined diameter arranged axially apart from each other, and a belt at least partially surrounding the at least two pulleys; and a transmission device including at least two external readers and an evaluation and control unit for controlling the rotational speed and / or torque of the drive device, wherein, when the belt rotates, a signal identifiable at the external readers is generated by each marker and output to the evaluation and control unit. In other words, each marker in the marker pair can also emit an identification identifier, whereby the emitted signal captured by one of the external readers can be assigned to each individual marker. By assigning signals to individual markers, it is advantageous to first perform the signal assignment of markers to the marker pair. Accordingly, each marker in the marker pair can be detected and identified by each external reader.

[0057] The belt rotates circumferentially around the pulley in the form of a loop and is driven circumferentially by a drive device. The belt has load-carrying strands (also called load strands) and unloaded strands arranged opposite to the load strands.

[0058] In other words, when a belt transmits power, the force ratio in the belt strands changes. The power introduced into the loaded strands of the belt by the pulley connected to the drive motor and transmitted causes an increase in the force in the loaded strands, and this increase in force causes the loaded strands of the belt to stretch, depending on the belt stiffness. The increase in force in the loaded strands causes an equal amount of force to decrease in the unloaded strands, and the shortening of the unloaded strands depends on the belt stiffness. This condition applies if the unloaded strands have a preload of >0 Newtons. Therefore, even during operation under dynamic loads, the total force in the belt and the length of the belt remain constant.

[0059] In a state of no power transmission and without load on the belt, the markings of the belt's marking pairs are arranged one after the other in the circumferential direction at a predetermined reference spacing. The no-load state is understood as a static state where no power is transmitted through the belt. In this state, the belt may already be statically pre-tensioned.

[0060] When the belt transmits power, the reference spacing between the markings of the first marking pair becomes the first measuring spacing, wherein when the belt transmits power, the reference spacing between the markings of the second marking pair becomes the second measuring spacing.

[0061] As mentioned earlier, power transmission causes an increase in force and elongation in the loaded strands, and a decrease in force and shortening in the unloaded strands.

[0062] In other words, according to Hooke's Law, there is a proportional relationship between the force changes and lengths in the loaded and unloaded strands. Therefore, even during operation under dynamic load, the total force in the belt and the length of the belt remain constant.

[0063] Furthermore, at least one of the pulleys has at least one marking section, wherein, when the pulley rotates, the marking section of the pulley generates an identifiable signal at one of the external readers and outputs it to the evaluation and control unit. The same applies to the marking section of the pulley; as described at the beginning, in addition to the signal used to assign a signal to the marking section, an identification identifier can also be transmitted to the external reader.

[0064] The transmission device is arranged not to contact the belt, such that the markings on the belt and the markings on the pulley are successively guided through the transmission device. The evaluation and control unit then determines the running time based on two signals under each condition.

[0065] The evaluation and control unit then determines the average speed of the belt and the speed of the pulleys based on the running time.

[0066] As mentioned at the beginning, the length of the belt is predetermined and constant. Although the length of the belt strands may vary in segments due to dynamic load stress, the total length of the belt remains constant due to the explanatory relationships between the force balances throughout the belt drive. Therefore, the average speed of the belt can be determined by the travel time of the determined markings during one revolution of the belt and the predetermined belt length.

[0067] The pulley also has a predetermined diameter. As the pulley rotates, its speed can be determined in the same way as explained in the example of the belt.

[0068] The method according to the present invention is characterized by the following method steps:

[0069] a) A signal is generated from the first marker section of the belt at the first external reader.

[0070] b) A signal is generated from the second marker section of the belt at the first external reader.

[0071] c) A signal is generated from the third marker section of the belt at the first external reader.

[0072] d) A signal is generated from the fourth marker section of the belt at the first external reader.

[0073] e) A signal is generated from the first marker section of the belt at the second external reader.

[0074] f) A signal is generated from the second marker section of the belt at the second external reader.

[0075] g) A signal is generated from the third marker section of the belt at the second external reader.

[0076] h) A signal is generated from the fourth marker section of the belt at the second external reader.

[0077] i) The evaluation and control unit determine the running time based on two signals under their respective conditions.

[0078] j) The average speed of the belt is determined using an evaluation and control unit based on the travel time of one of the marked parts of the determined marked part pair over the circumferential length during one revolution of the belt.

[0079] k) Use the evaluation and control unit to determine the difference in running time between two consecutive markers of the tape at the external reader of the assigned load strand.

[0080] l) The measurement spacing between two consecutive marks in a load strand is determined by the difference between the average speed of the belt and the running time of two consecutive marks in a given belt mark pair.

[0081] m) Using the evaluation and control unit, the difference between the running times of two consecutive markers of the tape pair is determined at the external reader assigned to the unloaded strand.

[0082] n) The measurement spacing between two consecutive markers in a marker pair in an unloaded strand is determined by the difference between the determined average speed of the belt and the running time of two consecutive markers in a determined marker pair of the belt.

[0083] o) Use the evaluation and control unit to determine the spacing difference between two consecutive markers in the loaded and unloaded strands of the belt.

[0084] p) The reference spacing between two consecutive markers in a pair of markers in the belt is determined by averaging the measured spacing between the markers in the loaded and unloaded strands of the belt using the evaluation and control unit.

[0085] q) The longitudinal elongation of the load strand of the belt is determined using an evaluation and control unit by measuring the distance between two consecutive markers in a determined pair of markers in the load strand of the belt and a determined reference distance.

[0086] r) The tension and tension difference in the load strands of the belt are determined by assigning the belt to the spring stiffness stored in the evaluation and control unit, and by the spacing difference between two consecutive markers in the load strands of the belt.

[0087] s) A signal is generated from the marking section of the pulley at one of the external readers.

[0088] t) The evaluation and control unit determines the running time of the marking section of the pulley based on two signals.

[0089] u) The evaluation and control unit determines the speed of the pulley based on the travel time of the determined markings on the pulley's defined circumference.

[0090] v) Use an evaluation and control unit to determine the slippage between the belt and pulley based on the determined speeds of the belt and pulley.

[0091] In other words, each external reader can record, for example, a change in the electromagnetic field emitted by the external reader as the tag passes by, and this electromagnetic field is defined as a signal from the corresponding tag. The assignment of the signal to the tag can be performed as described at the beginning through the individual identification tag of the corresponding tag.

[0092] The method according to the invention is particularly advantageous because it allows for the use of a single sensor system to measure both the force, speed, and slip of multiple components of a belt drive (specifically the belt and pulleys). This method can be implemented particularly cost-effectively because multiple measurements can be performed by combining the components.

[0093] According to another aspect of the method of the invention, it has proven particularly advantageous that when a predetermined limit value for the speed difference between the belt and pulley stored in the evaluation and control unit is exceeded, the evaluation and control unit controls the drive torque or drive speed in such a way that the speed difference moves within the defined limit value. In other words, the permissible limit value for slippage between the belt and pulley can be stored in the evaluation and control unit. Depending on the number of markings on the belt's marking pairs, the belt speed can be determined at least once per revolution of the belt and compared with or proportionally set to the speed of the pulley. The speed difference or slippage thus determined can then be compared with the stored limit value. If the speed difference between the belt and pulley exceeds the defined limit value, the drive speed or drive torque can be reduced. In the adjusted performance data, the speed values ​​of the belt and pulley can be further recorded, and the results can be compared again to see if they meet the defined limit value for slippage. If necessary, further power adjustments can be made to the transmission until the slippage moves within the defined limit value. In this way, increased belt wear due to high temperatures caused by excessive slippage can be advantageously prevented.

[0094] According to another aspect of the method of the invention, the evaluation and control unit backs up the historical force distribution data with reference to it and other historical sensor data from measuring devices of other machine components in the memory and stores them there.

[0095] Historical force distribution data related to the belt is monitored within pre-specified limit values ​​stored in the memory of the evaluation and control unit. Conclusions regarding wear of machine components outside the device are drawn by taking into account additional historical sensor data related to other machine components obtained from the memory of the evaluation and control unit. This sensor data can be permanently stored long-term for historical traceability. Furthermore, the same stored historical force distribution data related to the belt can be assigned to these historical sensor data.

[0096] In other words, additional sensor data from measuring devices belonging to other machine components driving the machine can be stored in the memory of the evaluation and control unit. The permissible limit value of the belt force can also be stored in the evaluation and control unit. By comparing the currently determined force in the belt with the stored limit value, an irregularity can be determined if the permissible limit value is exceeded. If the permissible limit value is exceeded, the evaluation and control unit can output a warning signal. Taking into account additionally determined historical sensor data related to other machine components, a correlation can be established between changes in belt force and changes in the other sensor data. In particular, it may be very important to consider changes in the force distribution data related to the belt in conjunction with additional sensor data from measuring devices of other machine components.

[0097] This can be explained using the example of an attachment to agricultural machinery. This attachment could be the cutting unit of a combine harvester. Advantageously, the harvest amount per unit time can be recorded by a measuring device of the cutting unit. For example, the wear of the blades of the belt-driven cutting unit can be identified by comparing force distribution data associated with the belt (which can be determined by the method according to the invention) with the distribution of the harvest amount per unit time of the cutting unit. For example, if the force in the belt increases while the harvest amount decreases, the blades may become dull or damaged, and accordingly, it can be concluded that the blades need to be replaced.

[0098] According to another aspect, the method according to the invention is provided for monitoring belt drive devices on attachments of agricultural machinery. In this way, the advantages of the aforementioned sensor monitoring can be transferred to agricultural machinery. In particular, the goal of agricultural machinery is high availability during harvest. Therefore, avoiding wear-related machine failures is especially important, and thus monitoring of belt drives is particularly relevant. Attached Figure Description

[0099] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0100] Figure 1 A schematic diagram of an advantageous configuration of the device is shown.

[0101] List of reference numerals

[0102] 1 device

[0103] 2 belts

[0104] 3 pulleys

[0105] 4 drive units

[0106] 5 Transmission devices

[0107] 6.1 First External Reader

[0108] 6.2 Second External Reader

[0109] 7. Evaluation and Control Unit

[0110] The first marking part of the 8-band

[0111] The second marking part of the 9-band

[0112] The third mark of the 10-band

[0113] The fourth mark section of the 11th belt

[0114] Marking section of 12 pulleys

[0115] A. Pulley axis spacing

[0116] D Spring stiffness

[0117] Longitudinal elongation of the ε band

[0118] F-line free length

[0119] Fz tension

[0120] dFz tension difference

[0121] L R Circumferential length of the belt

[0122] L S circumferential length of the pulley

[0123] The measurement spacing of the first marker of M1

[0124] The measurement spacing of the second marker of M2

[0125] dM spacing difference

[0126] R Reference Spacing

[0127] SM8 signal from the reader of the first marker section

[0128] SM9 signal from the reader of the second marker section

[0129] The signal from the reader of the third marker section of the SM10

[0130] The signal from the reader of the fourth marker section of SM11

[0131] SM12 signal from the reader of the pulley's marking section

[0132] The travel time of the marking section of the TR belt in the circumferential length during one rotation of the belt.

[0133] The difference between the running times of two consecutive markers in a dTR marker pair

[0134] The travel time of the marking section of the TS pulley along its circumferential length.

[0135] TR1 load line

[0136] TR2 Unloaded Stock Line

[0137] U-shaped direction

[0138] V2 average speed

[0139] V3 pulley speed

[0140] Slippage between V4 belt and pulley Detailed Implementation

[0141] Figure 1 An advantageous construction of device 1 is schematically illustrated. Device 1 includes a belt 2 having a predetermined longitudinal stiffness and a drive unit 4 having two pulleys 3 of, for example, a predetermined diameter, arranged relative to each other with an axial distance A. One of the pulleys 3 is connected as a driven pulley to a motor of the drive unit 4. The belt 2 is designed to rotate in a loop along the circumferential direction U and partially surround each of the two pulleys 3. The belt 2 is driven by the drive unit 4 through the two pulleys 3, causing the belt 2 to rotate along the circumferential direction U.

[0142] The belt 2 has a base material and at least one reinforcement. For example, the base material may be partially or completely formed of a rubber material, or partially or completely formed of a polyurethane material. However, other materials may also be provided for the base material. The base material is preferably electrically insulating. The reinforcement is embedded in the base material as a continuous cord spirally wound along the circumferential direction U. The reinforcement is used to transmit force along the circumferential direction U of the belt 2. The reinforcement may be formed, for example, of metal wire or of plastic filament strands (such as plastic fiber strands made of, for example, polyamide). The individual turns of the cord forming the reinforcement in the transverse direction of the belt 2 may be arranged to be distributed relative to each other. In this case, each turn extends along the circumferential direction U. The length of the belt 2 is constant and independent of the operating state.

[0143] The belt 2 also has at least a first marking portion 8, a second marking portion 9, a third marking portion 10, and a fourth marking portion 11. In one embodiment, marking portions 8, 9, 10, and 11 are formed as SAW sensors and embedded in the base material of the belt. SAW sensors are particularly well-suited for use in the belt 2 because they are subjected to the required temperatures during the production of the belt 2 and require very little energy for wireless data transmission of sensor signals, allowing them to be used at high relative speeds between the sensor and the associated external readers 6.1, 6.2. Here, the first marking portion 8 and the second marking portion 9 form a first marking portion pair, while the third marking portion 10 and the fourth marking portion 11 form a second marking portion pair. The first and second marking portion pairs are arranged such that, in the unloaded state of the belt 2 without power transmission, one marking portion pair is located in the loaded strand TR1 and the other marking portion pair is located in the unloaded strand TR2. In the unloaded state of the belt 2, the marking portions 8, 9 and 10, 11 of the marking portion pairs are arranged one behind the other along the circumferential direction U at a predetermined reference spacing R. When power is transmitted through belt 2, the reference spacing R becomes the first measuring spacing M1 of the first marking pair of marking parts 8 and 9, and the second measuring spacing M2 of the second marking pair of marking parts 10 and 11.

[0144] In addition, one of the pulleys 3 also has a marking part 12 in the form of a SAW sensor, and the pulley is preferably driven by a motor.

[0145] The transmission device 5 includes two external readers 6.1 and 6.2, and an evaluation and control unit 7. One of the external readers 6.1 and 6.2 is arranged in the inlet region of the belt 2, which enters and correspondingly exits from the pulley 3 including the marking part 12, and the other is arranged in the outlet region of the belt. The transmission device 5 is arranged not to contact the belt 2 and the pulley 3, such that the marking parts 8, 9, 10, and 11 of the marking part pair of the belt 2 and the marking part 12 of the pulley 3 are successively guided through the transmission device 5. The marking parts 8, 9, 10, and 11 of the marking part pair of the belt 2 are detected by the external readers 6.1 and 6.2 and identified based on the individual identifier of each individual marking part 8, 9, 10, and 11, and output as signals SM8, SM9, SM10, and SM11 by the external readers 6.1 and 6.2 to the evaluation and control unit 7.

[0146] Similarly, when pulley 3 rotates, the marking part 12 is detected and identified by one of the external readers 6.1 and 6.2, and output as signal SM12 to the evaluation and control unit 7.

[0147] Here, each of the external readers 6.1 and 6.2 is configured to capture signals SM8, SM9, SM10, SM11, and SM12.

[0148] The evaluation and control unit 7 is configured to determine the corresponding running time based on two signals SM8, SM9, SM10, SM11, and SM12 under each condition.

[0149] Furthermore, the evaluation and control unit 7 is configured to determine the average speed V2 of the belt 2 based on the running time TR of one of the markers 8, 9, 10, 11 of the marker pair on the circumferential length LR when the belt 2 rotates one revolution, and to determine the speed V3 of the pulley 3 based on the running time TS of the marker 12 on the defined circumference LS stored in the evaluation and control unit 7.

[0150]

[0151]

[0152] By determining the difference dTR between the running time of two consecutive markers 8 and 9 in the marked pair of the loaded strand TR1 and the running time of markers 10 and 11 in the marked pair of the unloaded strand TR2 of belt 2, the first measurement spacing M1 of the first marked pair of markers 8 and 9 and the second measurement spacing M2 of the marked pairs of markers 10 and 11 can be determined together with the belt average speed V2. The difference dTR between the running times of the first marked pair of markers 8 and 9 assigned to the loaded strand TR1 and the difference dTR between the running times of the second marked pair of markers 10 and 11 assigned to the unloaded strand TR2 are determined by the external reader 6.1 assigned to the loaded strand TR1 and outputting signals SM8 and SM9 to the evaluation and control unit 7, and the external reader 6.2 assigned to the unloaded strand TR2 and outputting signals SM10 and SM11 to the evaluation and control unit 7, respectively.

[0153]

[0154] The evaluation and control unit 7 determines the spacing difference dM between two consecutive markings 8 and 9 of the first marking pair in the loaded strand TR1 and two consecutive markings 10 and 11 of the second marking pair in the unloaded strand TR2, based on the determined measurement spacings M1 and M2. The evaluation and control unit 7 determines the reference spacing R between the two consecutive markings 8 and 9 of the first marking pair in the loaded strand TR1 and the two consecutive markings 10 and 11 of the second marking pair in the unloaded strand TR2 by averaging the measurement spacings M1 and M2.

[0155]

[0156]

[0157] In the next method step, the evaluation and control unit 7 is used to determine the longitudinal elongation ε of the band 2 in the load strand TR1 based on the previously determined measurement spacing M1 and reference spacing R.

[0158]

[0159] In another method step, the evaluation and control unit 7 is used to determine the tension Fz and the tension difference dFz.

[0160] Here, the tension difference dFz corresponds to the force component added to the static pretension by the driving power introduced into the belt drive via the drive pulley 3. For this purpose, the spring stiffness D, individually assigned to the corresponding belt, is stored in the evaluation and control unit 7. The spring stiffness D depends on the belt specifications and must be stored in the evaluation and control unit 7 once when the machine is set up. Information related to the spring stiffness can also be provided, for example, via a scannable barcode on the belt. Furthermore, the measurement spacing M1 should be used as the basis for calculating the tension Fz, and the spacing difference dM should be used accordingly as the basis for calculating the tension difference dFz.

[0161]

[0162]

[0163] Furthermore, the evaluation and control unit 7 is designed to determine the slippage V4 between the belt 2 and the pulley 3 based on the determined speed V2 of the belt 2 and the speed V3 of the pulley 3.

[0164] .

Claims

1. A device (1) for determining the longitudinal elongation (ε) and average speed (V2) of a belt (2) and for determining the speed (V3) of at least one pulley (3), the device comprising -The belt with predetermined longitudinal stiffness (2). -in, The length of the band (2) is constant and independent of the operating state. -The band (2) has at least a first marking part (8), a second marking part (9), a third marking part (10) and a fourth marking part (11). - Wherein, the first marking portion and the second marking portion (8, 9) form a first marking portion pair, and the third marking portion and the fourth marking portion (10, 11) form a second marking portion pair. - A drive unit (4) having at least two pulleys (3) of a predetermined diameter, the at least two pulleys being arranged relative to each other with an axial distance (A), and the belt (2) at least partially surrounding the at least two pulleys. - Transmission device (5), which includes at least two external readers (6.1, 6.2) and an evaluation and control unit (7) suitable for controlling the rotational speed and / or torque of the drive device (4). - Wherein, when the belt rotates, signals (SM8, SM9, SM10, SM11) that can be identified at these external readers (6.1, 6.2) can be generated by each marker (8, 9 or 10, 11), and - It can output to the evaluation and control unit (7). -The belt (2) is designed to rotate in a loop along the circumferential direction (U) and is driven by the drive device along the circumferential direction (U). -The belt (2) has a load strand (TR1) for transmitting load and an unloaded strand (TR2) arranged opposite to the load strand. -In the absence of power transmission, the marking portions (8, 9 or 10, 11) of the marking portions of the belt (2) are arranged one after the other along the circumferential direction (U) at a predetermined reference spacing (R). -The reference spacing (R) of the marking portions (8, 9) of the first marking portion pair is designed such that when the belt (2) transmits power, the reference spacing becomes the first measuring spacing (M1). -The reference spacing (R) of the marking portions (10, 11) of the second marking portion pair is designed such that the reference spacing becomes the second measuring spacing (M2) when the belt (2) transmits power. -In this case, at least one of these pulleys (3) has at least one marking part (12). - Wherein, when the pulley (3) rotates, the marking part (12) of the pulley (3) is designed to generate an identifiable signal (SM12) at one of these external readers (6.1, 6.2) and output it to the evaluation and control unit (7). -The transmission device (5) is arranged not to contact the belt (2) in such a way that the markings of the belt (2) and the markings (8, 9, 10, 11, 12) of the pulley (3) can be successively guided through the transmission device (5). -The evaluation and control unit (7) is configured to determine the corresponding running time based on two signals (SM8, SM9, SM10, SM11, SM12) under each condition. -The evaluation and control unit (7) is configured to determine the average speed (V2) of the belt (2) based on the running time (TR) of one of the determined mark portions (8, 9 and 10, 11) in the circumferential length (LR) when the belt (2) rotates one revolution, and to determine the speed (V3) of the pulley (3) based on the running time (TS) of the determined mark portion (12) of the pulley (3). Its features are, When the belt (2) is not powered, at least one pair of markings formed by these markings (8, 9 or 10, 11) is arranged accordingly on the perimeter (U) of the belt (2) in the loaded strands and the unloaded strands (TR1, TR2), wherein the evaluation and control unit (7) is configured to -The longitudinal elongation of the belt is determined based on the average speed (V2) of the belt, the difference (dTR) between the running times of two consecutive marker portions (8, 9 or 10, 11) of the marker portion pair in both the loaded strand (TR1) and the unloaded strand (TR2) of the belt (2), the measured spacing (M1, M2) between the marker portions (8, 9 or 10, 11) of the marker portion pair in both the loaded strand (TR1) and the unloaded strand (TR2) determined therefrom, and the reference spacing (R) as the average of the determined measured spacing (M1, M2). - Using the evaluation and control unit (7), the tension (Fz) and tension difference (dFz) in the load strand (TR1) of the belt (2) are determined by the spring stiffness (D) assigned to the belt (2) and stored in the evaluation and control unit (7) and the pitch difference (dM) of the mark portion (8, 9 or 10, 11) of the mark portion pair in the load strand (TR1) of the belt (2). - and is also configured to determine the slip (V4) between the belt (2) and the pulley (3) based on the ratio of the average speed (V2, V3) determined according to the belt (2) and the pulley (3).

2. The apparatus (1) as described in claim 1. Its features are, These markers (8, 9, 10, 11, 12) are designed as surface acoustic wave sensors.

3. The apparatus (1) as described in claim 1. Its features are, These markings (8, 9, 10, 11, 12) are designed as RFID transponders.

4. The apparatus as claimed in claim 1, Its features are, These markings (8, 9, 10, 11, 12) are designed as ferromagnetic markings.

5. The apparatus (1) as described in claim 1. Its features are, The driven pulley has at least one marking part (12).

6. The apparatus (1) as claimed in claim 1. Its features are, One of these external readers (6.1, 6.2) is arranged in the inlet region of the belt (2) that enters / exits the pulley (3), and the other is arranged in the outlet region of the belt.

7. The apparatus (1) as claimed in claim 1. Its features are, When the predetermined limit value of the slip (V4) between the belt (2) and the pulley (3) stored in the evaluation and control unit (7) is exceeded, the evaluation and control unit (7) is configured to control the drive torque or drive speed in such a way that the slip (V4) moves to within the defined limit value.

8. The apparatus (1) as described in any one of claims 1 to 7. Its features are, The evaluation and control unit (7) is coupled to an additional measuring device of the machine component and includes a memory, the memory... - Used for backing up historical sensor data and - Used to back up historical force distribution data related to this band (2), The evaluation and control unit (7) is designed as follows: - Monitor historical force distribution data associated with the band (2) within pre-specified limit values ​​stored in the memory of the evaluation and control unit (7). - and take into account historical sensor data related to other machine components from the memory of the evaluation and control unit (7) to draw conclusions about wear of machine components other than the device (1).

9. An attachment for an agricultural machine having at least one means (1) for monitoring a device driven by a belt (2) as described in any one of claims 1 to 8.

10. A method for determining the longitudinal elongation (ε) and average speed (V2) of a belt (2) and for determining the speed (V3) of at least one pulley (3), comprising: -The belt (2) has a predetermined longitudinal stiffness. -in, The length (LR) of the band (2) is constant and independent of the operating state. -The band (2) has at least a first marking part (8), a second marking part (9), a third marking part (10) and a fourth marking part (11). - Wherein, the first marking portion and the second marking portion (8, 9) form a first marking portion pair, and the third marking portion and the fourth marking portion (10, 11) form a second marking portion pair. - A drive unit (4) having at least two pulleys (3) of a predetermined diameter, the at least two pulleys being arranged relative to each other with an axial distance (A), and the belt (2) at least partially surrounding the at least two pulleys. - Transmission device (5), which includes at least two external readers (6.1, 6.2) and an evaluation and control unit (7) for controlling the rotational speed and / or torque of the drive device (4). - Wherein, when the belt rotates, the signals (SM8, SM9, SM10, SM11) that can be identified at these external readers (6.1, 6.2) are generated by each marker (8, 9 or 10, 11), and - Output to the evaluation and control unit (7). The belt (2) is designed to rotate in a loop along the circumferential direction (U) and is driven by the drive device (4) along the circumferential direction (U). The belt (2) has a load strand (TR1). And the unloaded strand (TR2) arranged opposite to the loaded strand. -In the absence of power transmission and under no-load conditions, the marking portions (8, 9 and 10, 11) of the belt (2) are arranged one after the other along the circumferential direction (U) at a predetermined reference spacing (R). -When the belt (2) transmits power, the reference spacing (R) of the marking portions (8, 9) of the first marking portion pair becomes the first measuring spacing (M1). -When the belt (2) transmits power, the reference spacing (R) of the markings (10, 11) of the second marking pair becomes the second measuring spacing (M2). At least one of these pulleys (3) has at least one marking part (12), wherein when the pulley (3) rotates, the marking part (12) of the pulley generates an identifiable signal at one of these external readers (6.1, 6.2) and outputs it to the evaluation and control unit (7). -The transmission device (5) is arranged not to contact the belt (2) in such a way that the markings of the belt (2) and the markings (8, 9, 10, 11, 12) of the pulley (3) are successively guided through the transmission device (5). -The evaluation and control unit (7) determines the running time (TR, TS) based on two signals (SM8, SM9, SM10, SM11, SM12) under each condition. -The evaluation and control unit (7) determines the average speed (V2, V3) of the belt (2) and the pulley (3) based on these running times (TR, TS). Its characteristics are defined by the following method steps: a) A signal (SM8) is generated from the first mark section (8) of the band (2) at the first external reader (6.1). b) A signal (SM9) is generated from the second marker (9) of the band (2) at the first external reader (6.1). c) A signal (SM10) is generated from the third marker (10) of the band (2) at the first external reader (6.1). d) A signal (SM11) is generated from the fourth mark section (11) of the band (2) at the first external reader (6.1). e) A signal (SM8) is generated from the first marker (8) of the band (2) at the second external reader (6.2). f) A signal (SM9) is generated from the second mark section (9) of the band (2) at the second external reader (6.2). g) A signal (SM10) is generated from the third mark section (10) of the band (2) at the second external reader (6.2). h) A signal (SM11) is generated from the fourth mark section (11) of the band (2) at the second external reader (6.2). i) Using the evaluation and control unit (7), the running time is determined based on the two signals (SM8, SM9, SM10, SM11) under each condition. j) Using the evaluation and control unit (7), the average speed (V2) of the belt (2) is determined based on the running time of one of the markers (8, 9 or 10, 11) of the determined marker pair over the circumferential length when the belt (2) rotates once. k) Using the evaluation and control unit (7), the difference (dTR) between the running times of two consecutive markers (8, 9 or 10, 11) of the marker pair of the strip (2) is determined at the external reader (6.1) assigned to the load strand (TR1). l) The measurement interval (M1, M2) of the two consecutive marks (8, 9 or 10, 11) in the load strand (TR1) is determined by the difference (dTR) between the determined average speed (V2) of the belt (2) and the running time of two consecutive marks (8, 9 and 10, 11) of the mark pair of the belt (2). m) Using the evaluation and control unit (7), determine the difference (dTR) between the running times of two consecutive markers (8, 9 or 10, 11) of the marker pair of the strip (2) at the external reader (6.2) assigned to the unloaded strand (TR2). n) The measurement interval (M1, M2) of the two consecutive markers (8, 9 or 10, 11) in the unloaded strand (TR2) is determined by the difference (dTR) between the determined average speed (V2) of the belt (2) and the running time of the two consecutive markers (8, 9 and 10, 11) of the marker pair of the belt (2). o) Using the evaluation and control unit (7), determine the pitch difference (dM) between two consecutive markers (8, 9 and 10, 11) in the load strand (TR1) and unloaded strand (TR2) of the strip (2). p) Using the evaluation and control unit (7), the reference spacing (R) of the two consecutive markings (8, 9 or 10, 11) of the marking pair in the load strand (TR1) and unloaded strand (TR2) of the strip (2) is determined by averaging the measured spacing (M1, M2) of these measured spacings (M1, M2). q) Using the evaluation and control unit (7), the longitudinal elongation (ε) of the load strand (TR1) of the belt (2) is determined by the measured spacing (M1, M2) of two consecutive markers (8, 9 or 10, 11) of the marker pair in the determined load strand (TR1) of the belt (2) and the determined reference spacing (R). r) Using the evaluation and control unit (7), the tension (Fz) and tension difference (dFz) in the load strand (TR1) of the belt (2) are determined by the spring stiffness (D) assigned to the belt (2) and stored in the evaluation and control unit (7) and the pitch difference (dM) between two consecutive marks (8, 9 or 10, 11) in the mark pair of the load strand (TR1) of the belt (2). s) A signal (SM12) is generated from the marking part (12) of the pulley (3) at one of these external readers (6.1, 6.2). Using the evaluation and control unit (7), the running time (TS) of the marking part (12) of the pulley (3) is determined based on two signals (SM12). u) Using the evaluation and control unit (7), the speed (V3) of the pulley (3) is determined based on the running time (TS) of the mark (12) of the pulley (3) on the defined circumference of the pulley (3). v) Using the evaluation and control unit (7), the slippage (V4) between the belt (2) and the pulley (3) is determined based on the determined speeds (V2, V3) of the belt (2) and the pulley (3).

11. The method as described in claim 10, Its features are, When the predetermined limit value of the slip (V4) between the belt (2) and the pulley (3) stored in the evaluation and control unit (7) is exceeded, the evaluation and control unit (7) reduces the driving torque or driving speed so that the slip (V4) moves within the defined limit value.

12. The method as described in claim 10, Its features are, The evaluation and control unit (7) stores historical force distribution data related to the belt (2) and additional historical sensor data from measuring devices of other machine components in its memory. And monitor historical force distribution data associated with the band (2) within pre-specified limit values ​​stored in the memory of the evaluation and control unit (7). Among them, taking into account the additional historical sensor data related to other machine components determined from the memory of the evaluation and control unit (7), conclusions are drawn about the wear of machine components other than the device (1).

13. The method of any one of claims 10 to 12 is used for monitoring drive devices on attachments of agricultural machinery.

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