TW202202425A - Monitoring device and method for monitoring the state of a conveyor belt of a conveyor belt system - Google Patents

Abstract

The invention relates to a monitoring device (3) for monitoring the state of a conveyor belt (2) of a conveyor belt system (1), having a holding device (5), at least one force transmission device (6) attached to the holding device (5), and a setting device (7) which is connected to the holding device (5) and/or the force transmission device (6) in such a way that a surface of the force transmission device (6) can be brought into contact with the conveyor belt (2). According to the invention, at least one sensor (8) is arranged on and/or in the holding device (5) or on and/or in the setting device (7) for monitoring the state of the conveyor belt (2), by means of which a change in the mechanical stress tensor of the holding device (5) or the setting device (7) can be detected at least indirectly.

Description

Monitoring device and method for monitoring conveyor belt status of conveyor belt system

The present invention relates to a monitoring device for monitoring the state of a conveyor belt system. The monitoring device comprises a holding device, at least one force transmission device attached to the holding member, and a setting device connected to the holding device and/or the force transmission device such that the surface of the force transmission device can be brought into contact with the conveyor belt. Furthermore, the present invention relates to a method for monitoring the condition of a conveyor belt of a conveyor belt system using a monitoring device of the aforementioned type.

Conveyor belt systems have moving conveyor belts for transporting bulk materials such as sand, gravel, coal, ore, and the like. In practice, control methods with which the condition of the conveyor belt can be optically monitored are known. However, this requires complex evaluation of the measurement results and is also error-prone, associated with high operating, maintenance and manufacturing costs. If damage or potential damage - eg due to sticking bulk material - is detected too late, this can cause damage to the entire conveyor belt system, or even cause the conveyor belt system to malfunction and result in subsequent inestimable costs. If, for example, bulk material enters the drive system of the conveyor belt system, the damage can be considerable.

Damage to the conveyor belt should be detected as early, reliably and automatically as possible, wherein false detections (even if no damage is actually inferred but damage is inferred) should be avoided as much as possible. Preferably, when damage occurs, its position on the conveyor belt is detected as accurately as possible.

It is therefore an object of the present invention to provide a monitoring device and/or method for efficiently and reliably monitoring the condition of the conveyor belt of a conveyor belt system, in particular, in which the disadvantages of the prior art are avoided or at least substantially reduced.

In order to solve this problem, the present invention provides a monitoring device for monitoring the state of the conveyor belt of the conveyor belt system. The monitoring device has a holding device, at least one force transmission device attached to the holding device, and a setting device. The setting device is connected to the holding device and/or the force transmission device in such a way that the surface of the force transmission device can come into contact with the conveyor belt.

The at least one sensor is arranged on and/or in the holding device to monitor the state of the conveyor belt. By means of sensors, changes in the mechanical stress tensor of the holding device can be detected directly and/or at least indirectly.

In an alternative embodiment according to the present invention, at least one sensor is provided on and/or in the setting device for monitoring the status of the conveyor belt. By means of sensors, changes in the mechanical stress tensor of the setting device can be detected directly and/or at least indirectly.

According to the invention, at least indirect condition monitoring of changes in the mechanical stress tensor of the holding device or setting device ensures that the condition of the conveyor belt can be monitored and/or conclusions can be drawn about the condition of the conveyor belt, preferably for Damage detection.

In tests carried out in accordance with the present invention, it has been found that in the event of a change in the stress tensor of the holding device or setting device (in particular, the change is outside a predefined (specifically) acceptable range), Conclusions can be drawn about belt damage. The measurement data and/or measurement signals recorded by the sensors can be evaluated in particular, so that, for example, situations that fall below a limit value and/or exceed a limit value (in particular this limit a predefined range) can be evaluated. ) to perform the check.

By monitoring the change in the mechanical stress tensor indicating the holding device or the setting device and/or the mechanical stress tensor and/or variables, values and/or properties associated with this change, according to the invention it is possible to identify possible damage in due time events and, in particular, estimates of the extent of possible damage. This ensures, in particular, a significant reduction in operating and maintenance costs for the entire conveyor belt system.

In particular, in the event of expansion and/or compressive deformation of the holding device or setting device, the mechanical stress tensor of the holding device or setting device may change. In particular, sensors may be provided via sensors to detect this change. Thus, a change in the mechanical stress tensor of the holding device or the setting device can provide information about the stress and/or the stress on the holding device or the setting device, which in turn can be related to the state of the conveyor belt.

The mechanical tension of the holding device or setting device is actually a measure of the internal stress due to the stress from the outside. Stresses from the outside are triggered during operation of the conveyor belt system by using force transmission means arranged on the holding means.

The term "stress tensor" characterizes a holding device or setting device as a three-dimensional object in and/or on which mechanical stress may ultimately occur. As a component of the stress tensor, mechanical stress exists in the laws of physics. Furthermore, the stress tensor also describes the state of stress in and/or at a particular point within the holding device or setting device.

In particular, it is understood in accordance with the present invention that, in the case where changes in the mechanical stress tensors are detected indirectly by sensors, the stress tensors at the same reference point are compared to each other. For example, a sensor is configured at a specific point and at least indirectly detects the mechanical stress tensor and/or a variable related to the mechanical stress tensor, which may be recorded and/or detected at the same configuration point of the sensor Changes in the mechanical stress tensor are measured.

Furthermore, the normal stress in the normal direction is combined with the tangentially acting (transverse) shear stress in the stress tensor to form a mathematical object. In accordance with the present invention, it should be understood that it is not necessary to experimentally record the entire stress tensor in order to monitor the state of the stress tensor, but rather that recording changes already provide information about the state of the conveyor belt, in particular, wherein the change in the stress tensor is at least substantially the same as related to the same reference point.

According to the invention, a monitoring device is provided in which a reliable, efficient and economical monitoring of the conveyor belt is possible in a relatively simple manner, possibly by monitoring the holding device or the setting device. By carrying out a number of experiments, it has been further found that the state of the conveyor belt can be changed by the mechanical stress tensor, in particular, the elongation, compression of the holding device or the setting device at the specific location where the sensor is (preferably) arranged and/or changes in mechanical tension.

In a particularly preferred embodiment, it is provided that the stresses caused by the conveyor belt and occurring at the holding means or at the setting means can be detected by means of sensors when the force transmission means or the setting means are in contact with the conveyor belt. In particular, the stress on the holding device or the setting device is detected by the stress on the holding device or the setting device caused by the operation of the conveyor belt system and the force transmission device applied to the conveyor belt. In particular, the sensor can detect when the holding device or the setting device undergoes this change such that the force transmission device is out of or has been out of contact with the conveyor belt.

In addition, the sensors may preferably be designed to detect bending moments, torques, and/or shear forces, and/or lateral forces of deformation of the holding device or setting device caused by the conveyor belt on the holding device or setting device . Deformation of the holding device can occur, in particular, when the holding device or the setting device is bent, in particular, in the case of conveyor belt damage, which in turn can be detected by the sensors. In the event of a change in deformation, bending and/or bending moment and/or torque, the mechanical stress tensor of the holding device or setting device also changes. This can be detected at least indirectly by the sensor.

Preferably, the sensor comprises or is designed as a strain gauge. In particular, strain gauges are essentially used to detect tensile and/or compressive deformation, where the strain gauge changes its electrical resistance under such deformation and/or stretching.

Alternatively or additionally, sensors may be provided designed to detect vibrations caused by the conveyor belt and occurring at and/or in the holding device, or at and/or in the setting device. According to the invention, it has been found that by detecting vibrations it is possible to draw conclusions about the state of the conveyor belt, so that in particular possible conveyor belt damage can be detected immediately and thus corrected.

Furthermore, in another preferred embodiment of the present invention, it is provided that the sensor is separately installed on and/or in the holding device, or on and/or in the setting device, and/or is separately coupled to the holding device or set the device.

The sensor may be positioned directly adjacent to the force transmission device or spaced apart from the force transmission device. Even in a position spaced from the force transmission device, the sensor can detect changes in the mechanical tension of the holding device due to stress and/or stress on the holding device or setting device.

Preferably, the sensor is arranged on the surface of the holding device or the setting device, in particular is bonded to the surface of the holding device or the setting device.

Preferably, the sensor is positioned in the central area of the holding device.

Preferably, the holding device has a holding section, in particular a central section that brings the force transmission device into direct abutment with at least one zone and/or surface. The sensors can preferably be arranged on and/or in the holding section. It will be appreciated that the holding section may also have regions and/or surfaces that are not directly adjacent to the force transmission device.

In a particularly preferred embodiment, the holding section arranged in the particularly center has at least one front area directly adjoining the force transmission means, a rear area opposite the front area and two side areas connecting the front and rear areas .

The holding section can - as seen in section - have a circular, oval, polygonal outer shape and/or a basic shape, in particular a rectangular or hexagonal shape and/or an I-profile.

Loads and/or stresses on the holding device caused by the force transmission device can be introduced into the holding device via the region preceding the holding section.

The sensors may preferably be arranged on one of the front regions, the rear regions, or the side regions. Preferably, at least one other sensor is arranged on the front area, and/or at least one other sensor is arranged on the rear area, and/or at least one other sensor is arranged on one of the side areas.

In this context, it should be understood that other sensors may be at least substantially identical in construction to the first sensor. Alternatively or additionally, it is also possible to provide that the sensors are different from each other. Finally, other sensors can likewise be designed to indirectly detect changes in the mechanical stress tensor of the holding device and further be configured on and/or in the holding device. In particular, regarding preferred embodiments of other sensors, reference may be made to the previous explanations regarding sensors, which also apply to other sensors in the same way.

Particularly preferably, one sensor is arranged at the front area and the other sensor is arranged at the rear area. In alternative preferred embodiments, one sensor is arranged on one side area and the other sensor is arranged on the other side area.

In another preferred embodiment of the invention, the sensor and/or at least one other sensor, preferably all sensors, are arranged at least substantially eccentrically on the holding device with respect to the longitudinal axis of the holding device The upper and/or holding device is, in particular, eccentrically arranged on the holding section of the holding device.

In particular, the longitudinal axis of the holding device corresponds to the direction of maximum extension of the holding device. The longitudinal axis of the holding device is in particular arranged transversely, preferably at an angle of 90° +/- 20° to the conveying direction of the conveyor belt.

In a preferred embodiment, the sensor and at least one other sensor are arranged on the front area of the holding section, the maximum width of the sensor is in the direction of the longitudinal axis of the holding device, and the maximum width of the other sensors is Transverse to the longitudinal axis of the holding device. Furthermore, at least two other sensors can be arranged on the area behind the holding section, wherein again the greatest extent of one sensor extends in the direction of the longitudinal axis of the holding device, and the greatest extent of the other sensors is transverse to the holding means The longitudinal axis extends.

In other preferred embodiments, the sensor and at least one other sensor are preferably arranged eccentrically on the front area of the holding section, wherein the maximum extent of each sensor continues in the direction of the longitudinal axis of the holding device . Furthermore, at least two other sensors can preferably be arranged eccentrically on the area behind the holding section, wherein the maximum extent of each sensor again continues in the direction of the longitudinal axis of the holding device.

With these different configurations, the effects of temperature differences can be reduced. It is known that materials - and/or retention devices - also deform and/or expand with changes in temperature, and thus lead to changes in the mechanical stress tensor. In particular, however, this change due to temperature difference is not a direct indicator of conveyor belt status, and should therefore preferably be "filtered out".

Alternatively or additionally, the sensor may be arranged on one side area of the holding section. In addition, other sensors can be arranged on the other side area of the holding section. Preferably, the maximum extension of each sensor continues at an angle of 45° +/- 10° to the direction of the longitudinal axis of the holding device.

In other embodiments, sensors and/or at least one other sensor may also be provided, preferably all sensors are arranged outside the holding section.

Furthermore, several sensors can be provided coupled by means of at least one bridge circuit. Advantageously, the sensor is designed as a strain gauge coupled by means of at least one bridge circuit. A bridge circuit is advantageous because it can compensate for temperature effects.

In making the present invention, it has been found that by connecting a plurality of sensors to form at least one bridge circuit, measurement errors caused by temperature differences can be compensated. Therefore, the efficiency of the entire monitoring device can be further improved. Measurement errors due to temperature differences can be caused by weather, as well as by bulk material, and/or by the operation of the entire conveyor system.

Furthermore, the monitoring device preferably has a transmission designed for wired and/or wireless transmission of measurement signals to the sensors of the control device and/or evaluation results determined by the evaluation device based on the measurement signals of the sensors device.

Alternatively or additionally, it is also possible to provide that the measurement results detected by the sensor are amplified by at least one amplifying device.

In addition, processing of sensor signals and/or measurements detected by the sensors may be provided before they are transmitted. The processing of the measurement results can preferably be performed by the evaluation device and/or the control device.

Finally, in particular, the transmission device enables external processing and/or evaluation of the measurement signals and/or results of the sensor - ie - external to the holding device and/or the sensor.

The force transmission device can be arranged directly or at least essentially indirectly on the deflecting rollers of the conveyor belt. Other force transmission devices can also be arranged in the direction of continuation of the conveyor belt behind the first force transmission device on the lower running section of the conveyor belt.

Alternatively or additionally, it may be provided that only one force transmission device arranged on the lower running section of the conveyor belt in particular is provided.

The holding means are preferably adjustable. Preferably, the setting device generates the required pretension so that the surface of the force transmission device can come into contact with the conveyor belt. For this purpose, the setting device may have a drive motor. The force transmission means are interchangeably arranged on the holding means.

Furthermore, the present invention relates to a method for monitoring the condition of a conveyor belt system. The method includes providing a monitoring device according to at least one of the previously set forth embodiments. Furthermore, in the method according to the invention, when the force transmission device is in contact with the conveyor belt, at least indirectly, it is detected that the force transmission device is caused by the conveyor belt and occurs at and/or in the holding device of the monitoring device, or at the setting device and /or a change in the holding device in the setting device or the mechanical stress tensor of the setting device.

According to the invention, it should be understood that during and/or after a change in the mechanical stress tensor of the holding device or the setting device, the force transmission device may also be disengaged from the conveyor belt in particular due to damage that has occurred on the conveyor belt contact.

Finally, in particular, it should be understood that during the control operation of the conveyor belt system, the force transmission means are in contact with the conveyor belt and are held by the holding means on which the force transmission means pressurize.

Regarding the advantages of preferred embodiments and/or procedures according to the invention, reference may be made to the explanations in particular concerning the monitoring device according to the present invention, which explanations also apply to the procedure according to the present invention in the same way - and this does not need to be any further explicit mention.

The method according to the invention makes it possible to monitor the conveyor belt in an efficient, reliable and economical manner, in particular to detect possible damage to the conveyor belt in good time.

Alternatively or additionally, other relevant parameters of the conveyor belt system, such as the quality of the bulk material, the pretension applied by the holding device, etc., can also be monitored by the monitoring method according to the invention.

In a particularly preferred embodiment, it is provided that the bending moment exerted by the conveyor belt on the holding means or the setting means, and/or the holding means or Set shear and/or lateral force and/or deformation of the device. It will be understood that, according to the invention, it is also possible to use, in particular, a plurality of sensors designed as strain gauges, which sensors are connected to each other in particular using bridge circuits, and/or whose signals are preferably amplified .

Furthermore, in a preferred embodiment of the invention, detection of vibrations caused by the conveyor belt and occurring at and/or in the holding device, or at and/or in the setting device is provided. Vibration can in particular be determined by sensors.

In addition, in other preferred embodiments, the measurement signal of the sensor and/or the evaluation result determined based on the measurement result of the sensor may be provided to be transmitted to the control device by wire and/or wirelessly.

In particular, the processing of the measurement signals of the sensors can take place in the control device. Based on these measurements, for example, the quality of the block material and/or the pretension of the setting device and/or the loss of the force of the conveyor belt and/or the elongation of the conveyor belt can be detected. A comparison with limit values can also be performed so that possible damage to the conveyor belt can be detected in due time.

Alternatively or additionally, it may be provided that - after damage is detected - determining the location of the damage immediately. According to the invention, this is preferably achieved by signalling the starting position of the conveyor belt, wherein the damage distance from the starting position can be multiplied by the time distance of the measured value from the measured value from the starting position by the control device Calculated by belt speed. Thus, according to the invention, it is possible to avoid a time-consuming search for damage on conveyor belts - in particular, on conveyor belts that are several thousand meters long.

Furthermore, the extent of damage can also be estimated by the control device based on the measurement signals from the sensors, so that alarms and/or warnings can also be generated and/or issued, and/or an immediate stop of the conveyor system.

The quality of the bulk material can be determined, in particular, based on the measurement data recorded by the sensors, to the extent that conclusions can be drawn about the quality of the bulk material that is specifically removed from the force transmission device. In particular, it can be determined whether the bulk material is, for example, wet, dry, sticky, and the like.

In other preferred embodiments, after the force transmission device has been in contact with the conveyor belt, a plurality of limit values are determined from the maximum value of the measurement signal of the sensor of the monitoring device; if the limit value is exceeded after the limit value is determined, the limit value is exceeded. one of the values, a warning signal is issued. Thus, according to the invention, it is possible to determine limit values individually adapted to the respective conveyor belt system, which limit values can be used for monitoring and, in particular, for timely detection of damage. In particular, the limit values are adapted to the conveyor belt used in the conveyor belt system.

The maximum value of the sensor's measurement signal - in terms of absolute value measurement results - may have a positive or negative sign, and/or may be a positive or negative measurement signal.

Alternatively or additionally, the average value of the sensor's measurement signal can be used for damage detection.

In particular, the monitoring method and/or the configuration of the monitoring device can be performed by determining the limit values to be specified. The relevant evaluation and/or calibration can preferably be performed by a monitoring device.

Furthermore, it should be expressly pointed out that all of the above-mentioned and following intervals contain all intermediate intervals and also individual values contained therein, and such intermediate intervals and individual values are to be considered to be critical to the present invention, notwithstanding that Such intermediate intervals or individual values are not indicated in particular detail.

Other features, advantages and possible applications of the invention will be apparent from the following description of examples of embodiments based on the drawings, as well as from the drawings themselves. In this context, all features described and/or illustrated form the subject-matter of the present invention, individually or in any combination, regardless of their generality in the scope of the claims or their retrospective effect.

Figure 1 shows schematically a conveyor belt system 1 with a conveyor belt 2 in which a first embodiment of a monitoring device 3 according to the invention is used to monitor the state of the conveyor belt 2 .

In the illustrated and preferred embodiment, the monitoring device 3 is designed to transmit measurement data, for example, to the control and/or processing device 4 .

The monitoring device 3 has a holding device 5 and at least one force transmission device 6 attached to the holding device 5 , in this case three force transmission devices 6 . Furthermore, the monitoring device 3 comprises a setting device 7 connected to the holding device 5 in such a way that the surface of the force transmission device 6 can come into contact with the conveyor belt 2 .

In order to monitor the state of the conveyor belt 2 , at least one sensor 8 is arranged on and/or in the holding device 5 . By means of the sensor 8, a change in the mechanical stress tensor of the holding device 5 can be detected at least indirectly - for example, caused by tension, compression and/or deformation.

Not shown, in other alternative and preferred embodiments, it is provided that in order to monitor the state of the conveyor belt 2, at least one sensor 8 is arranged on and/or in the setting device 7, wherein by means of the sensor 8 , a change in the mechanical stress tensor of the setting device 7 can be detected at least indirectly.

To detect changes in the mechanical stress tensor, measurements from sensors 8 at the same reference point and/or location can be compared.

The measurement data acquired by the sensor 8 can be transmitted to an external device, such as the control device 4 .

Figure 1 shows - in a schematic representation - the front end of a conveyor belt system 1 for conveyed material 9 in the conveying direction. The conveyed material 9 may also be referred to as bulk material. The conveyor belt 2 has an upper conveying section 10 and an underlying return section 11 (lower running section). The conveyor belt 2 is configured to continuously circulate in the conveyor belt system 1 . The conveyor belt 2 runs around deflection rollers 12 in the transition zone from the conveying section 10 to the return section 11 .

The system connected to the conveyor belt 2 is not shown in detail, but the drive means for driving the conveyor belt 2 are provided.

On the conveyor belt 2 - ie at the top of its conveying section 10 - conveyed material 9 is indicated schematically in FIG. 1 . For example, bulk materials such as sand, gravel, coal, ore, etc. may be transported as material 9 .

In FIG. 1 , the force transmission device 6 is shown engaging the conveyor belt 2 at the transition from the conveying section 10 to the return section 11 , which is at the front in the conveying direction.

Figure 2 shows a schematic side view of the discharge end of the conveyor belt system 1 and a second embodiment of the monitoring device 3 according to the present invention. In this second embodiment, in addition to the previously explained holding means 5, the monitoring device 3 has other holding means 5', at least one other force transmission means 6' (in this case three other force transmission means 6' ') attached to other holding means 5'. In this case, the monitoring device 3 comprises further setting means (not shown in FIG. 2 ) connected to the other holding means 5 ′ in such a way that the surface of the other force transmission means 6 ′ can come into contact with the conveyor belt 2 . A further holding device 5 ′ is here arranged behind the holding device 5 shown in FIG. 2 in the conveying direction.

In the illustrated and preferred embodiment, the holding device 5 has a centrally arranged holding section 13, of which at least one front region 14 is arranged directly on the force transmission device 6, the rear region 15 is opposite the front region 14, and the two Each side area 16 connects the front area 14 and the rear area 15 . In the embodiment example according to FIG. 1 , the sensor 8 is arranged on the front area 14 . Here, the sensor 8 is attached to the holding device 5 alone.

Not shown in detail, when at least one of the force transmission devices 6 is in contact with the conveyor belt 2, by means of the sensors 8, the stresses caused by the conveyor belt 2 and occurring at the holding device 5 can be detected.

Illustratively, Figure 3a shows the sensor 8 monitoring the state of the conveyor belt 2 when the force transmission device 6 is in contact with the conveyor belt 2. Compared to Figure 3b, it can be seen that a change in the deformation of the holding means 5 has taken place. In the state shown in FIG. 3 b , the force transmission device 6 is no longer in direct contact with the conveyor belt 2 . This state can arise, for example, in the event of possible damage to the conveyor belt 2 . Changes in the holding device 5 can be detected by the sensor 8 .

Thus, FIG. 3 b shows schematically that the sensor 8 is designed to detect the bending moment exerted by the conveyor belt 2 on the holding device 5 , and/or the deformation of the holding device 5 caused by the conveyor belt 2 . Not shown, the sensor 8 can also do the same when configured on the setting device 7 .

4 to 6 schematically show perspective views of the holding section 13 of the holding device 5 of the monitoring device 3 according to the invention, ie with different configurations of the sensors 8 . In the example of embodiment shown in FIGS. 4 to 6 , shown schematically, strain gauges are provided as sensors 8 . The sensor 8 may comprise a strain gauge or be designed as such.

The section of the holding device 5 shown in FIGS. 4-6 may in particular be the holding section 13, which is configured to be in direct contact with the force transmission device 6 (not shown there).

In the preferred embodiment shown in FIGS. 4 to 6 , the holding section 13 has at least one front area 14 arranged directly on the force transmission device 6 , a rear area 15 opposite the front area 14 and a connecting front area 14 and the two side regions 16 of the rear region 15 . In the stressed state of the conveyor belt system 1 , the stress is applied from the force transmission device 6 to the front region 14 and into the holding device 5 .

Here, the holding section 13 has a circular basic shape - as seen in section.

In the embodiment example shown in FIG. 4 , two sensors 8 are arranged on the area 14 in front of the holding section 13 , with the greatest extent of the sensors 8 continuing in the direction of the longitudinal axis X of the holding device 5 . Furthermore, two other sensors 8 are also arranged on the area 15 behind the holding section 13 , again where the greatest extent of the sensors 8 continues in the direction of the longitudinal axis X of the holding device 5 .

In the embodiment example shown in Fig. 5, in each case two sensors 8 (at both end regions) are arranged eccentrically on the region 14 before the holding section, each sensor 8 The greatest extent continues at an angle of 45° +/- 10° to the direction of the longitudinal axis X of the holding device 5 . Furthermore, two other sensors 8 are arranged eccentrically at each end area on the area 15 behind the holding section 13 , the maximum extent of each sensor 8 is again at 45° to the direction of the longitudinal axis X of the holding device 5 An angle of +/- 10° continues.

In the embodiment example shown in FIG. 6 , the four sensors 8 are arranged eccentrically on the side regions 16 of the holding section 13 . The maximum extension of each sensor 8 continues at an angle of 45° +/- 10° to the direction of the longitudinal axis X of the holding device 5 .

The sensors 8 shown in FIGS. 4-6 may be coupled to each other and/or be of the same design. It may also be provided that the sensors 8 shown in FIGS. 4-6 are coupled and/or connected to each other via at least one bridge circuit.

Not shown, the sensor 8 may be designed to detect vibrations caused by the conveyor belt 2 and/or occurring in the holding device 5 , or on or in the setting device 7 .

Figure 7 shows schematically that several sensors 8 are provided coupled by means of a bridge circuit. In particular, the plurality of sensors 8 can be designed to be strained.

FIG. 8 schematically shows that the transmission means 17 of the monitoring device 3 are provided for transmitting the measurement results of the sensor 8 . The transmission device 17 is designed for wired and/or wireless transmission to the measurement signals of the sensors 8 of the control device 4 and/or evaluation results which have been determined by the evaluation device 18 based on the measurement signals of the sensors 8 .

FIG. 8 further schematically shows the evaluation device 18 . The evaluation device 18 can be arranged on and/or in the holding device 5 , or outside the holding device 5 . Evaluation device 18 may also be coupled to sensor 8 and receive detected measurement signals from sensor 8 .

The method for monitoring the status of the conveyor belt 2 of the conveyor belt system 1 is not shown in detail. The method comprises: providing a monitoring device 3 according to at least one of the embodiments set forth above. When the force transmission device 6 is in contact with the conveyor belt 2 , the monitoring device 3 is used to detect the difference in the mechanical stress tensor of the holding device 5 or the setting device 7 caused by the conveyor belt 2 and occurring at the holding device 5 or at the setting device 7 Change.

In this method, the holding means 5 or the setting means 7 can be provided to detect the bending moment exerted on the conveyor belt 2 and/or the deformation of the holding means 5 or the setting means 7 caused by the conveyor belt 2 . In this respect, a schematically illustrated variant of the holding device 5 or the setting device 7 is shown in Figure 3b. This deformation can be detected in particular by means of sensors 8 designed as strain gauges.

Not shown in detail, vibrations caused by the conveyor belt 2 and/or occurring at and/or in the holding device 5 , or at and/or in the setting device 7 can be detected in this way.

FIG. 8 shows that the measurement signal and/or the measurement result of the sensor 8 , and/or the evaluation result determined based on the measurement signal of the sensor 8 are transmitted to the control device 4 by wire and/or wirelessly.

Also not shown in detail, in this method several limit values are determined from the maximum value of the measurement signal of the sensor 8 of the monitoring device 3 after the force transmission device 6 has come into contact with the conveyor belt 2 .

This can be used to calibrate the monitoring device 3 and, in particular, to at least indirectly reflect such changes in the mechanical stress tensor as needed to trigger an alarm or warning signal. If, after determining the limit values, one of the limit values is exceeded, ie by the measurement signal detected by the sensor 8, a warning signal can be issued.

1: Conveyor belt system 2: Conveyor belt 3: Monitoring device 4: Control device 5: Retaining device 5': Holder/Other Holder 6: Force transmission device 6': Force Transmission/Other Force Transmission 7: Setting device 8: Sensor 9: Conveyed material/material/conveyed goods 10: Conveying section 11: Lower return section/return section 12: Deflection roller 13: Holding section/holding section from 5, 5' 14: Front Area/Front 15: Rear area/rear 16: Side Area/Sidewall 17: Transmission device 18: Evaluation device X: longitudinal axis/5, 5' longitudinal axis

It shows: Figure 1 is a schematic perspective view of the discharge end of the conveyor belt system and the first embodiment of the monitoring device according to the present invention, Figure 2 is a schematic side view of the discharge end and the second embodiment of the conveyor belt system of the monitoring device according to the present invention, Figure 3a is a schematic representation of a top view of the conveyor belt system from Figure 1 in a first state, Figure 3b is a schematic representation of the conveyor belt system shown in Figure 3a in the second state, 4 is a schematic perspective view of the holding section of the holding device with the first sensor configuration of the monitoring device according to the invention, 5 is a schematic perspective view of the holding section of the holding device with the second sensor configuration of the monitoring device according to the invention, 6 is a schematic perspective view of the holding section of the holding device with the third sensor configuration of the monitoring device according to the invention, Figure 7 is a schematic representation of the interconnection of sensors used to form a bridge circuit in accordance with the present invention, and Figure 8 Schematic representation of other embodiments of the monitoring device according to the invention.

1: Conveyor belt system

2: Conveyor belt

3: Monitoring device

4: Control device

5: Retaining device

6: Force transmission device

7: Setting device

8: Sensor

9: Conveyed material/material/conveyed goods

10: Conveying section

11: Lower return section/return section

12: Deflection roller

13: Holding section/holding section from 5, 5'

14: Front Area/Front

15: Rear area/rear

16: Side Area/Sidewall

X: longitudinal axis/5, 5' longitudinal axis

Claims (15)

A monitoring device (3) for monitoring the state of a conveyor belt (2) of a conveyor belt system (1), It contains: holding device (5), at least one force transmission device (6) attached to the holding device (5), and setting means (7) connected to the holding means (5) and/or the force transmission means (6) in such a way that the surface of the force transmission means (6) is brought into contact with the conveyor belt (2), Wherein at least one sensor (8) is arranged on the holding device (5) and/or in the holding device (5), or on the setting device (7) and/or in the setting device (7), for Monitoring the state of the conveyor belt (2), by means of the at least one sensor, can at least indirectly detect changes in the mechanical stress tensor of the holding device (5) or the setting device (7). A monitoring device as claimed in claim 1, wherein by means of the sensor (8), when the force transmission device (6) is in contact with the conveyor belt (2), it is possible to detect the occurrence and occurrence caused by the conveyor belt (2). Stress at the holding device (5) or at the setting device (7). The monitoring device of claim 1 or 2, wherein the sensor (8) is designed to detect: The bending moment imposed by the conveyor belt (2) on the holding device (5) or the setting device (7), and/or Shearing and/or transverse forces caused by the conveyor belt (2) on the holding device (5) or the setting device (7), and/or Deformation of the holding device (5) or the setting device (7) caused by the conveyor belt (2). A monitoring device as claimed in claim 1 or 2, wherein the sensor (8) comprises a strain gauge or a strain gauge. A monitoring device as claimed in claim 1, wherein the sensor (8) is designed to detect caused by the conveyor belt (2) and present at and/or in the holding device (5), or vibrations at and/or in the setting device (7). The monitoring device of claim 1 or 2, wherein the sensor (8) is attached to the holding device (5) and/or the holding device (5) alone, and/or is coupled to the holding device (5) alone ). A monitoring device as claimed in claim 1 or 2, wherein a plurality of sensors (8) coupled by means of at least one bridge circuit are provided. A monitoring device as claimed in claim 1 or 2, wherein the monitoring device (3) comprises transmission means (17) designed for measuring signals and/or to the sensor (8) of the control device (4) Wired and/or wireless transmission of the evaluation results that have been determined by the evaluation device (18) based on the measurement signals of the sensor (8). A monitoring device as claimed in claim 1 or 2, wherein: The holding device (5) has in particular a centrally arranged holding section (13) with at least one front region (14) arranged directly on the force transmission device (6), opposite the front region (14) rear area (15), and two side areas (16) connecting the front area (14) and the rear area (15), The sensor (8) is arranged at the front area (14), at the rear area (15), or at one of the side areas (16), and preferably, At least one other sensor (8) is arranged on the front area (14), and/or at least one other sensor (8) is arranged on the rear area (15), and/or at least one other sensor (8) is disposed on at least one of the side regions (16). A monitoring device as claimed in claim 1 or 2, wherein the sensor (8) and/or at least one other sensor (8), preferably all sensors (8) are relative to the holding device (5) The longitudinal axis (X) is arranged at least substantially eccentrically on and/or in the holding device (5). A method for monitoring the state of a conveyor belt (2) of a conveyor belt system (1), comprising: providing a monitoring device (3) as in any one of claims 1 to 10; and Detection of the monitoring device caused by the conveyor belt (2) and present at the holding device (5) or at the setting device (7) when the force transmission device (6) is in contact with the conveyor belt (2) (3) Changes in the mechanical stress tensor of the holding device (5) or the setting device (7). A method as claimed in claim 11, wherein the application by the conveyor belt (2) to the holding means (5) or the setting means (7) is detected, preferably by means of sensors (8) designed as strain gauges bending moment, and/or shear and/or transverse forces caused by the conveyor belt (2) on the holding device (5) or on the setting device (7), and/or by the conveyor belt (2) The resulting deformation of the holding device (5) or the setting device (7). A method as claimed in claim 11 or 12, wherein the detection is caused by the conveyor belt (2) and occurs at the holding device (5) and/or in the holding device (5), or at the setting device (7) and /or vibration in the setting device (7). The method of claim 11 or 12, wherein the measurement signals of the sensor (8) and/or the evaluation results determined based on the measurement signals of the sensor (8) are transmitted wired and/or wirelessly to the control unit (4). The method of claim 14, wherein the maximum of the measurement signals from the sensor (8) of the monitoring device (3) after the force transmission device (6) has been in contact with the conveyor belt (2) A value determines a plurality of limit values, and wherein after the determination of the limit values, a warning signal is issued when one of the limit values is exceeded.

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