Process and system for indirect identification of wear of a sliding energy chain

Abstract

The present invention relates to a system (10) for indirect wear identification in an energy chain (12). The system (10) comprises a preferably stationarily arranged sensor arrangement (28) and an evaluation device (30) in signal connection with the sensor arrangement (28). The sensor arrangement (28) is arranged and configured to generate, during a movement of the energy chain relative to the sensor arrangement, a corresponding output signal that is evaluated by the evaluation device (30) in response to at least one characteristic of the chain links (26) present or detectable, in particular corresponding to a chain pitch of the energy chain (12), in a cyclical repetition.

Description

[Technical field]

[0001] The present invention generally relates to a system and process for monitoring or condition monitoring of a moving or dynamic line guide, in particular an energy chain, for guiding at least one line, such as a cable, a hose, etc., between a stationary fixed point in a mobile plant or machine part in general and a drive part movable therewith.

[0002] The invention relates in particular to a system and a process for the indirect identification of wear during operation of an energy chain, with the consequence that predictive maintenance is possible.

[0003] The energy chain generally comprises a stationary lower run, a movable upper run and a deflection arc that moves together therebetween during operation. The present invention particularly relates to an energy chain having a sliding upper run for long travels. [Background technology]

[0004] For wear identification, measures are known in which specific sensor modules are integrated into the line guide device or energy chain, as proposed for example in EP 1 269 633 B1 or EP 1 269 633 B2. However, these measures require structural modifications to the energy chain and available installation space inside the receiving space for the line. A further approach to wear monitoring is proposed in EP 1 269 633 B1, but again structural measures to the energy chain are required or this approach is only suitable for sliding energy chains with sliding shoes. A further approach to wear monitoring is presented in EP 1 269 633 B1, in which the presence or absence of critical wear of the chain is ascertained for a wear element with a predetermined breaking point. The predetermined breaking point here is the indicator used for the critical wear state of the chain.

[0005] In US Pat. No. 5,399,544 a similar approach is presented as in US Pat. No. 5,399,544, where the wear elements are configured as transponders. In US Pat. No. 5,499,544 or US Pat. No. 5,499,544 an approach is presented in which the chain progression is monitored, which is not immediately suitable for wear identification.

[0006] A structurally simple means for identifying wear during operation of various energy chains is desirable, which can be used as widely as possible and can be implemented as far as possible in existing energy chains without structural measures, modifications or alterations. In particular, wear monitoring on normal articulated connections between chain links should be possible without having to modify the energy chain for this purpose. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] International Publication No. 2017 / 129805 [Patent Document 2] International Publication No. 2019 / 201482 [Patent Document 3] International Publication No. 2021 / 043668 [Patent Document 4] European Patent Application Publication No. 1521015 [Patent Document 5] German Utility Model No. 202016000501 [Patent Document 6] German Utility Model No. 202016107317 [Patent Document 7] International Publication No. 2018 / 115528 Summary of the Invention

[0008] This object is achieved by a system according to claim 1 or a process according to claim 11. Preferred embodiments or developing features are defined in the dependent claims 2 to 10 and 11 to 20. Further features are derived in particular from these dependent claims.

[0009] The invention starts from a system for indirect wear identification in an energy chain. The energy chain generally serves to guide at least one line, such as a cable, a hose, etc., between a stationary fixed point and a drive part movable relative to it. The energy chain is movable and comprises a stationary lower run, a movable upper run and a deflection arc between them. The energy chain is implemented and arranged in particular with a sliding upper run, as is generally the case for long movements. In this case, the sliding upper run also means an upper run that rolls on the lower run.

[0010] It is proposed that the sensor arrangement comprises at least two sensors, both of which are arranged and configured in the following manner, in that during the operation of the energy chain relative to the sensor arrangement, in a cyclical repetition, in particular in response to at least one feature present or detectable corresponding to the chain pitch of the energy chain, the sensors generate corresponding output signals which are evaluated by an evaluation device, which is configured to detect and evaluate the temporal behavior of the output signals of the individual sensors. The system preferably comprises a preferably stationarily arranged sensor arrangement and an evaluation device in signal connection to the sensor arrangement.

[0011] According to the invention, the sensor arrangement is arranged and configured to generate, during the operation, in particular the movement, of the energy chain relative to the sensor arrangement, a corresponding output signal which is evaluated by the evaluation device in response to at least one feature, which is present in particular corresponding to the chain pitch of the energy chain and is in particular detectable. In particular, according to the invention, the detection of the time response of the energy chain is carried out by at least two sensors and can advantageously be evaluated, for example in order to identify an increase in wear, which may be indirectly identifiable by a change in the time response.

[0012] The feature may in particular be a structural feature of the energy chain, in particular of the individual chain links. It is preferably an inherently existing structural feature of the energy chain that is repeated in the longitudinal direction of the chain. The structural feature may be repeated several times over the entire length of the chain, for example on each chain link or on every second chain link and for example over substantially the entire length between the end fastenings.

[0013] The system is preferably arranged and configured for indirect wear identification for at least one chain link of the energy chain, preferably for wear identification at the connection of at least two chain links of the energy chain, which preferably comprises a plurality, such as several tens or even much more than a hundred, of chain links, which, apart from end connection links at the end sides if appropriate, are preferably formed all structurally identical (at so-called crank or fork plates) or alternately structurally identical (e.g. at alternating inner and outer plates).

[0014] The invention offers a number of advantageous effects. In particular, it advantageously allows the wear state of individual chain links to be identified. This allows for targeted replacement of only certain parts of the energy chain during maintenance, or for example for chain links subjected to higher strains to be replaced by chain links subjected to lower strains during maintenance. Thus, for example, the overall life span of the energy chain can be extended or the sustainability can be increased.

[0015] The system for indirect wear identification is preferably arranged on the energy chain between a stationary fixed point of the energy chain and a drive part of the energy chain which is movable relative to it.

[0016] At least one end of the energy chain is generally mobile, in particular mobile along the longitudinal axis of the energy chain, in particular with respect to at least the other end of the energy chain. The stationary fixed point of the energy chain is preferably arranged at one end of the energy chain. The drive of the energy chain is preferably arranged at the other end of the energy chain. The drive generally constitutes one end of the energy chain. In theory, the energy chain is divided into at least three different regions during operation. One of the at least three regions is preferably a stationary lower run extending from one end of the energy chain, in particular the end where the stationary fixed point is arranged, to the deflection arc, in particular the stationary lower run constituted by a part of the energy chain extending parallel to the longitudinal axis of the energy chain. The region of the energy chain constituting the stationary lower run is preferably configured stationary only with respect to the end where the stationary fixed point is arranged.

[0017] The system for indirect wear identification is preferably positioned at a fixed point on a virtual extension of the stationary lower run, such that the movable upper run passes over, in particular beyond, the sensor arrangement of the system and / or passes through the detection area of ​​the sensor arrangement.

[0018] Thus, one of the at least three regions is preferably a movable upper run extending from one end of the energy chain, in particular from the end where the drive is located, to the deflection arc, in particular a movable upper run formed by a part of the energy chain extending parallel to the longitudinal axis of the energy chain. One of the at least three regions is preferably a deflection arc arranged between other regions of the energy chain, preferably between a stationary lower run and a movable upper run, in particular a deflection arc forming an arc of the energy chain (so-called deflection arc) extending over an angular dimension of about 180°. The upper run is preferably slidingly mounted on the lower run. The upper run may alternatively or additionally be rollingly mounted on the lower run, in particular by means of at least one rolling element. The collective term sliding upper run in this case means a rolling upper run.

[0019] The system preferably comprises a sensor arrangement, which is arranged stationarily, in particular with respect to the energy chain. The system preferably comprises an evaluation device, which is mounted and arranged remotely therefrom. The evaluation device is preferably signal-connected to the sensor arrangement, preferably at least for data transmission, in particular from the sensor arrangement to the evaluation device. During operation, the sensor arrangement preferably transmits a continuous signal to the evaluation device, for example in real time or as a periodic signal with a suitable transmission frequency of 20 Hz or more, preferably 50 Hz or more.

[0020] The sensor arrangement is preferably arranged and configured to generate corresponding output signals in response to at least one feature of the energy chain, which the evaluation device evaluates. The sensor arrangement is preferably configured to generate corresponding output signals in response to at least one feature of the energy chain and transmit them to the evaluation device. The feature of the energy chain is present during the movement, in particular during the movement, of the energy chain relative to the sensor arrangement, preferably periodically recurring, in particular corresponding to the chain pitch of the energy chain. The at least one feature of the energy chain is preferably a feature selected such that it is present in each chain link of the energy chain, in particular both at the same point in the chain link.

[0021] The characteristic of the energy chain is preferably detectable periodically during the movement, especially during the movement, of the energy chain relative to the sensor arrangement, especially corresponding to the chain pitch of the energy chain. For example, at least one characteristic of the energy chain can be selected as each element of the chain link that is internal to the deflection arc. For example, at least one characteristic of the energy chain can be formed as a lettering of the chain link.

[0022] A crossbar or a crossbar arrangement inherently provided on each chain link or on every nth chain link is particularly preferably used as at least one feature of the energy chain, the crossbar being inherently or per se optically and / or electromagnetically detectable without modification.

[0023] As a complement or alternative, at least one feature of the energy chain may be provided as a feature that can be added with little effort. Thus, a code, in particular a barcode and / or a QR code, can for example be formed on the chain links. For example, at least one feature of the energy chain can be configured as an optical element on the chain links which generates in particular an optical signal, preferably an electromagnetic signal, for example in the visible light spectrum, preferably in the infrared spectrum, particularly preferably outside the visible spectrum, particularly preferably in the non-visible spectrum.

[0024] Other designs are also contemplated. Thus, the sensor arrangement may be configured to detect at least optical, preferably electromagnetic signals. For example, at least one feature of the energy chain may be configured as an acoustic element of a chain link that generates, in particular, an acoustic signal, for example in the audible signal frequency spectrum, preferably in the non-audible signal frequency spectrum, for example in the ultrasonic range or in the infrasonic range. In particular, the sensor arrangement may be configured to detect at least acoustic signals, in particular sound waves or solid-borne sounds. Here, the driving noise inherently generated during operation may also be monitored without specific or additional acoustic elements being provided.

[0025] The sensor arrangement is preferably configured for monitoring the energy chain, in particular at least one characteristic of the energy chain, preferably of each chain link of the energy chain, during operation of the energy chain. The sensor arrangement preferably comprises at least one, preferably at least two sensors configured for detecting at least one characteristic of the energy chain during operation of the energy chain.

[0026] The evaluation device is particularly preferably configured to determine the distance between two chain links of the energy chain from an output signal which it receives from the sensor arrangement.

[0027] The evaluation device is preferably configured to determine the instantaneous speed of a chain link of the energy chain, for example an individual chain link or both two chain links, from the output signal which the evaluation device receives from the sensor arrangement.

[0028] The evaluation device is preferably configured to standardize any specified distance between two chain links by the specified instantaneous speed of the chain link considered in particular.

[0029] The evaluation device is particularly preferably configured to determine the wear state of the energy chain, in particular of the chain links of the energy chain, from the determined distances, in particular standardized distances, between the chain links of the energy chain.

[0030] In a development example, the evaluation device is configured to determine from the output signal it receives from the sensor arrangement a change in the instantaneous speed of the chain links of the energy chain, where the evaluation device can be configured to determine a wear state of the energy chain, in particular of the chain links of the energy chain, from the determined change in the instantaneous speed of the chain links of the energy chain, for example speed recovery during a change in direction of the energy chain is slower between chain links connected with play due to wear than between chain links connected with play due only to manufacturing tolerances in like-new condition.

[0031] Conclusions about the wear state of the connection of two chain links can, for example, be drawn from the accelerations of the individual chain links.

[0032] In particular from the frequency of the signal, preferably from frequency changes, a particularly advantageously relatively highly accurate determination of the speed and acceleration of the chain links can be realised by the sensor arrangement. In particular frequency effects, such as for example the Doppler effect, can be used to realise a particularly advantageously highly accurate determination of the speed and acceleration of the chain links. In particular, the evaluation device can be configured to determine, preferably average, the wear state of the energy chain, in particular of the chain links of the energy chain, from the in particular standardised distances between the chain links of the energy chain and from changes in the determined instantaneous speeds of the chain links of the energy chain.

[0033] By "longitudinal axis" of an object is meant in particular here an axis which runs parallel to the longest edge of the smallest imaginary geometric cube which can completely enclose the object, and preferably runs through the geometric center of the object, in particular the cube.

[0034] The evaluation device comprises in particular at least one processor and / or at least one processor unit, at least one memory unit and operating, control and / or computing programs stored in the memory unit.

[0035] In particular, at least two sensors of the sensor configuration are preferably each arranged such that during operation of the energy chain with respect to the sensor configuration, they periodically and repeatedly detect at least one feature that is present, in particular corresponding to the chain pitch of the energy chain. In particular, at least two sensors of the sensor configuration are preferably each set to generate a corresponding output signal in response to at least one feature. The evaluation device is preferably configured to evaluate the output signal. The evaluation device is particularly preferably set to detect and evaluate the temporal behavior of the output signals of the individual sensors.

[0036] Through the design according to the invention of a detection system for indirect wear identification in an energy chain, an advantageous high-precision monitoring of the wear state of the energy chain can be achieved. In particular, an advantageous cost-effective early identification of an impending breakage of the energy chain can be achieved.

[0037] It is further proposed that at least two sensors are arranged and configured to be spaced apart from one another in the direction of movement, each of the sensors detecting the presence of a passing crossbar of the energy chain and outputting a corresponding output signal. The sensor arrangement preferably comprises a plurality of sensors, preferably spaced apart from one another in the direction of movement, each of the sensors being arranged to detect the presence of a passing feature of the energy chain as at least one feature of the energy chain, in particular a crossbar, and outputting a corresponding output signal. The sensor arrangement preferably comprises a plurality, preferably at least two, in particular at least three sensors, which are preferably arranged spaced apart from one another in the direction of movement of the energy chain, preferably at least partially and / or at least completely offset relative to one another in the direction of movement of the energy chain. Each of the sensors preferably both detects the presence of at least one considered feature of the energy chain, for example a passing crossbar. Each of the sensors preferably outputs an output signal corresponding to the detected presence or absence of at least one same feature of the energy chain, for example a passing crossbar. Advantageously long-term uninterrupted detection of at least one feature of the energy chain becomes feasible.

[0038] It is further proposed that the sensors are embodied as electromagnetic, in particular capacitive, proximity sensors.The sensors of the sensor arrangement are preferably designed to be functionally identical and / or structurally identical.

[0039] The sensors of the sensor arrangement may alternatively and / or additionally be configured as inductive proximity sensors, acoustic sensors, light barriers, in particular infrared light barriers, etc. Advantageously rapid, in particular high-resolution, monitoring of the energy chain becomes feasible.

[0040] It is further proposed that at least two sensors of the sensor arrangement are arranged at a distance corresponding to a nominal (new equivalent) chain pitch and / or are arranged and configured to detect features depending on the chain pitch. Preferably, at least two sensors are provided and / or the two sensors are arranged at a distance corresponding to a nominal, in particular a new equivalent, chain pitch. The sensor arrangement preferably has at least two sensors arranged offset relative to one another along the direction of movement, in particular along the longitudinal axis of the energy chain, at a distance corresponding to a nominal, in particular a new equivalent, chain pitch. The system for indirect wear identification in an energy chain preferably has an energy chain. The geometric centers of the at least two sensors are preferably arranged offset relative to one another along the direction of movement, in particular along the longitudinal axis of the energy chain, at a distance corresponding to a nominal, in particular a new equivalent, chain pitch. Two chain links are detectable simultaneously in order to advantageously be able to monitor the distance between the two chain links.

[0041] It is further proposed in a preferred development that the sensor arrangement is stationarily arranged adjacent to a fixed point in the direction of movement of the energy chain. The sensor arrangement is preferably stationarily connected to a carrier unit for the energy chain, in particular to a rail unit. The sensor arrangement for monitoring the upper run of the energy chain is preferably stationarily arranged adjacent to a fixed point in the direction of movement of the energy chain. The stationary fixed point of the energy chain is generally arranged in the lower run of the energy chain. The sensor arrangement is preferably arranged offset relative to the stationary fixed point in the direction of movement of the energy chain, in particular along the longitudinal axis of the energy chain. The rail unit preferably has at least two rails aligned parallel to the longitudinal axis of the energy chain, on which the energy chain is mounted and to which the sensor arrangement is mechanically connected or fixed in place with respect to the rail. The stationary fixed point of the energy chain is preferably connected to the rail unit offset relative to the sensor arrangement along the longitudinal axis of the rail unit. Advantageous monitoring of the upper run of the energy chain during operation can be realized.

[0042] It is further proposed that the evaluation device detects the instantaneous speed of the individual chain links from the time behavior of the output signal and / or that the evaluation device comprises three sensors, two sensors of the sensor arrangement being arranged at a distance corresponding to the nominal chain pitch and a third sensor being provided for identifying the movement direction. The evaluation device preferably detects and / or determines the time behavior of the output signal of the sensor arrangement, in particular of the individual sensors, and / or detects, preferably determines, the instantaneous speed of the individual chain links from the output signal. The evaluation device preferably determines the wear state of the connection of two chain links from the distance of two adjacent chain links, in particular in combination with the instantaneous speed. In particular the third sensor of the sensor arrangement is preferably configured to detect the movement direction of the energy chain, in particular corresponding to the instantaneous movement direction. In particular the third sensor of the sensor arrangement is preferably configured to appropriately directly identify the movement direction of the energy chain, in particular the instantaneous movement direction, and to transmit this to the evaluation device. Alternatively or additionally, the evaluation device may be configured to determine from the output signal of the third sensor, in appropriate cooperation with the output signal of one of the other two sensors, in particular the movement direction of the energy chain, in particular corresponding to the instantaneous movement direction. Alternatively or additionally, the instantaneous direction of motion or movement, e.g., forward movement of the energy chain travel run to an extended position or backward movement to a retracted position, may also be determined by or with reference to one or both of the first-mentioned sensors.

[0043] The monitoring of the wear of the energy chain can advantageously be realized independently of the speed, in particular in the chain links which are empirically most at risk, for example in the first third of the chain length on the drive side, and essential features of the chain which are present multiple times at least in this third are preferably considered as structural features in this respect.

[0044] It is further proposed that the evaluation device evaluates the output signal of the sensor arrangement for deviations from pre-stored behavior or reference values ​​of a brand new energy chain. The evaluation device preferably comprises at least one memory module in which data with reference or guide values ​​corresponding to a brand new energy chain are stored, preferably pre-stored. Advantageously rapid identification of defects in the energy chain is thereby possible.

[0045] It is further proposed that the evaluation device, by measuring the time intervals between the detected periodic features and both with reference to the detected instantaneous speed, determines the distance between successive chain links and compares said distance with a predefined nominal chain pitch, preferably for the purpose of wear identification. The evaluation device, preferably, determines a standardized distance between successive chain links by measuring the time intervals between the detected periodic features and both with reference to the detected instantaneous speed. The evaluation device preferably compares each determined distance, in particular the standardized distance, with a predefined nominal chain pitch, for wear identification for the corresponding chain link. Advantageously high-precision identification of wear of the energy chain becomes feasible.

[0046] It is further proposed that the evaluation device outputs a maintenance recommendation depending on the evaluation, in particular as a function of the current detection distance between the periodic features. The maintenance recommendation can be output, for example, to a higher-level computer. The evaluation device preferably has an output module connected to the higher-level system, for example by means of data processing techniques, and / or can be configured as an optical, acoustic and / or tactile output module. The output module can be configured, for example, as a complement to an acoustic output. The output module is preferably configured at least partially as a display and / or partially as a speaker. The maintenance recommendation can be output, for example, as an acoustic alarm sound. Additionally or alternatively, the maintenance recommendation can be configured as an optical alarm signal. Thus, advantageously, the optical and / or acoustic maintenance recommendation can be output, in particular as a complement to a data processing message or notification to the higher-level system.

[0047] It is further proposed that the sensor arrangement and the evaluation device detect a number of consecutive chain links for wear identification in each section. The sensor arrangement is preferably configured for continuous or permanent monitoring of the energy chain during operation or operation of the energy chain, in particular for detecting at least one characteristic feature of the chain link continuously at the chain link. Advantageously permanent monitoring of the chain links becomes feasible.

[0048] Furthermore, a method or process is proposed for indirect wear identification in the energy chain.

[0049] The process starts with a process for indirect wear identification in an energy chain for guiding at least one line, such as a cable, a hose, etc., between a stationary fixed point and a drive movable thereto. The energy chain is movable and comprises a stationary lower run, a movable upper run and a deflection arc therebetween, the energy chain being particularly implemented and arranged with a sliding upper run. A preferably stationarily arranged sensor arrangement is provided and an evaluation device is provided which is signal-connected to the sensor arrangement.

[0050] It is proposed that the sensor arrangement comprises at least two sensors, both arranged and configured in the following manner, in that during the operation of the energy chain relative to the sensor arrangement, the sensors generate corresponding output signals in response to at least one feature present, which periodically repeats and in particular corresponds to the chain pitch of the energy chain, in at least one process step, during the operation of the energy chain relative to the sensor arrangement, a corresponding output signal is generated by the sensor arrangement in a cyclically repeated manner and depending on at least one of said features, which is present or detectable in particular corresponding to the chain pitch of the energy chain, said output signal being evaluated by an evaluation device, The evaluation device detects and evaluates the temporal behavior of the output signals of the individual sensors.

[0051] In at least one process step, during the operation, in particular during a planned movement, of the energy chain relative to the sensor arrangement, a corresponding output signal is generated, preferably by the sensor arrangement, which is evaluated by the evaluation device, in accordance with at least one feature, which is present in a corresponding manner to the chain pitch of the energy chain and is particularly detectable. In at least one process step, the energy chain passing through the sensor arrangement is preferably monitored by the sensor arrangement. In at least one process step, an output signal is preferably generated by the sensor arrangement each time at least one feature is detected in a chain link. In at least one process step, at least each output signal is preferably transmitted to the evaluation device. In at least one process step, a continuous output signal is preferably transmitted to the evaluation device, which adopts a defined value in accordance with the presence of the at least one feature and a reference value otherwise.

[0052] It is further proposed that the sensors are arranged at a distance from one another in the direction of operation and that in at least one process step the presence of a passing crossbar of the energy chain, in particular as at least one feature, is detected by each sensor of the sensor arrangement and a corresponding output signal is output, making it possible to realize an advantageously long-term uninterrupted detection of at least one feature of the energy chain.

[0053] Furthermore, it is proposed that in at least one process step, a capacitive proximity sensor is used as a sensor of the sensor arrangement, which makes it possible to realize an advantageously rapid, in particular high-resolution, monitoring of the energy chain.

[0054] It is further proposed that at least two sensors of the sensor arrangement detect features depending on the chain pitch, preferably a third sensor is provided, the output signal of which is used, for example directly or indirectly, to identify the direction of movement.

[0055] Preferably, in at least one process step, at least two sensors of the sensor arrangement are used and / or two sensors of the sensor arrangement are used that are arranged at a distance corresponding to the nominal (as-new) chain pitch, and two chain links are detectable simultaneously in order to advantageously be able to monitor the distance between the two chain links.

[0056] Furthermore, it is proposed that in at least one process step, a stationary sensor arrangement is used adjacent to a fixed point in the direction of motion of the energy chain, so that advantageous monitoring of the upper run during the operation of the energy chain can be realized.

[0057] It is further proposed that in at least one process step, the evaluation device determines the instantaneous speed of the individual chain links from the time behavior of the output signals of the individual sensors. Preferably, in at least one process step, the time behavior of the output signals of the sensor arrangement, in particular of the individual sensors, is detected by the evaluation device and / or the instantaneous speed of the individual chain links is detected by the evaluation device from the output signals. Preferably, in at least one process step, the instantaneous speed of the individual chain links is determined by the evaluation device from the time behavior of the output signals of the sensor arrangement, in particular of the individual sensors. Preferably, in at least one process step, the distance, in particular the speed-normalized distance, of the individual chain links from one another is determined by the evaluation device from the output signals of the sensor arrangement, in particular of the individual sensors, and in particular from the time behavior of the output signals. Advantageously rapid, in particular high-resolution monitoring of the energy chain becomes feasible.

[0058] It is further proposed that in at least one process step, the output signals of the sensor arrangement, in particular of the individual sensors, are evaluated by an evaluation device for deviations from a pre-stored behavior of a brand-new equivalent energy chain. Preferably, in at least one process step, at least one distance, preferably speed-normalized, of the individual chain links from one another is compared by the evaluation device with a pre-stored distance of a brand-new equivalent energy chain. Advantageously, a speed-independent monitoring of the wear of the energy chain becomes feasible, in particular for the chain links empirically most at risk.

[0059] It is further proposed that in at least one process step the distance between successive chain links is determined by an evaluation device by measuring the time interval between the detected periodic features and both with reference to the detected instantaneous speed, and preferably compared with a predefined nominal chain pitch for wear identification purposes. Advantageously rapid identification of defects in the energy chain becomes possible.

[0060] It is furthermore proposed that in at least one process step, a maintenance recommendation is output by the evaluation device as a function of the evaluation, in particular as a function of the current detection distance between the periodic features. Advantageously, optical and / or acoustic maintenance recommendations can be output.

[0061] It is further proposed that in at least one process step, a number of successive chain links are detected by the sensor arrangement and the evaluation device for wear identification in each section. Advantageously permanent monitoring of the chain links is then feasible. Further details and advantageous effects of individual aspects of the invention can be seen from the following description of preferred embodiment examples with reference to the attached drawings, without limiting the generality of the above. Features having corresponding or identical structure or function have corresponding reference numerals and, where appropriate, are not described repeatedly. [Brief description of the drawings]

[0062] [Figure 1] FIG. 1 is a side view of an energy chain having a sliding upper run. [Diagram 2] FIG. 1 is a perspective view of a preferred embodiment of a system having a sensor arrangement with multiple sensors that detect the presence of a crossbar passing through an energy chain. [Diagram 3] 13A-13C show schematics of sensor configurations for multiple sensors in hole patterns for various chain types. [Figure 4A] 4 shows the temporal behavior of the individual sensors in the case of a passing energy chain. [Figure 4B] 4 shows the temporal behavior of the individual sensors in the case of a passing energy chain. [Figure 4C] 4 shows the temporal behavior of the individual sensors in the case of a passing energy chain. [Figure 4D] 4 shows the temporal behavior of the individual sensors in the case of a passing energy chain. [Diagram 5] 1 shows a schematic process according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0063] Figures 1 to 4 show an embodiment for implementing the basic principle for identifying wear, for example using the increase in play between the pins and holes in the articulated connections of the chain links, by calculating the difference in the distance of the open bars or cross bars between the pulling and pushing movements of the energy chain. The distance of the open bars corresponds to the time between the identification of two open bars at the measured instantaneous speed.

[0064] FIG. 1 shows an energy chain 12 (hereinafter abbreviated as EFK). One end 13 of the EFK 12 is movable along a longitudinal axis 14 of the EFK 12, in particular with respect to at least the other end 17 of the EFK 12, and in particular can be moved back and forth. A stationary fixed point 16 of the EFK 12 is arranged at the one end 17 of the EFK 12. A drive 18 of the EFK 12 is arranged at the other end 13 of the EFK 12. The drive 18 constitutes the one end 13 of the EFK 12. The EFK 12 is arranged such that during the operation of the drive 18 of the EFK 12, the EFK 12 forms at least three different regions 20, 22, 24, which in the illustrated example correspond to a lower run, a deflection arc and an upper run.

[0065] One of the three regions 20, 22, 24 is a stationary lower run 21, which extends from the end 17 of the EFK 12, where the stationary fixed point 16 is located, to the deflection arc 23, and is constituted by a part of the EFK 12 extending parallel to the longitudinal axis 14 of the EFK 12. The region 20 of the EFK 12, which constitutes the stationary lower run 21, is constituted stationary only in relation to the end 17, where the stationary fixed point 16 is located. One of the three regions 20, 22, 24 is a movable upper run 25, which extends from the end 13 of the EFK 12, where the drive part 18 is located, to the deflection arc 23, and is constituted by a part of the EFK 12 extending parallel to the longitudinal axis 14 of the EFK 12. The upper run 25 is slidingly mounted on the lower run 21. One of the three regions 20, 22, 24 is a deflection arc 23, which is disposed between a stationary lower run 21 and a movable upper run 25 and forms a 180° arc of the EFK 12.

[0066] However, the present invention is readily applicable to EFKs 12 having a movable lower run 21 and a stationary upper run 25.

[0067] For guiding one or more lines, such as cables, hoses, etc., the EFK 12 has a very widely known structure. It comprises a number of chain links 26, which are articulated with one another across the longitudinal axis 14. By way of example, only three chain links 26 are numbered. The EFK 12 has a movable end 13, at which the drive 18 is arranged. The EFK 12 has a fixed chain end 17, which is fixedly flange-mounted to a base 11, usually spatially fixed, of an outer carrier structure. In the operating state, the drive 18 moves back and forth, for example, left and right in FIG. 1, relative to a stationary fixed point 16 along the longitudinal axis 14. The drive 18 is, for example, a movable connection point in a machine to which energy, data and / or media should be supplied. The base 11 usually constitutes a fixed connection point. The drive 18 may alternately be vertically movable or movable along two axes. The EFK 12 constitutes therewith a deflection arc 23, which moves correspondingly with the movement of the drive. The deflection arc 23 is defined, for example, via a deflection roller or, typically, by an angle limiting stop on the chain link 26 .

[0068] Figure 2 shows a schematic diagram of a system, generally indicated at 10, for indirect wear identification in an EFK 12. The system 10 comprises as main components the EFK 12, an evaluation device 30 and a sensor arrangement 28 arranged on the EFK 12. The arrangement of the three sensors 38, 39, 40 of the sensor arrangement 28 is shown in Figure 2 purely by way of example. In Figure 3 the arrangement of the three sensors 38, 39, 40 of the sensor arrangement 28 is described more precisely. The sensor arrangement 28 is signal-connected to the evaluation device 30.

[0069] 2 shows a system for indirect wear identification, especially in an EFK 12. The EFK 12 is configured to guide at least one line 19, such as for example a cable, a hose, etc. The EFK 12 is configured to guide at least one line 19 between a stationary fixed point 16 and a drive part 18 that is movable relative thereto. The EFK 12 is movable and comprises a stationary lower run 21, a movable upper run 25 and a deflection arc 23 therebetween. The EFK 12 is implemented and arranged as a sliding upper run 25 on the lower run 21.

[0070] The system 10 comprises a stationary sensor arrangement 28 and an evaluation device 30 in signal connection with the sensor arrangement. The sensor arrangement is arranged and configured to periodically generate a corresponding output signal that is evaluated by the evaluation device in response to at least one characteristic that is present and is particularly detectable in response to the chain pitch of the EFK 12 during the movement, particularly during the movement, of the EFK 12 relative to the sensor arrangement. The system 10 is configured for indirect wear identification in the chain links 26 of the EFK 12. The EFK 12 has, by way of example, 20 or more chain links 26 that are all constructed identically. The system 10 is configured for indirect wear identification of the EFK 12 between a stationary fixed point 16 of the EFK 12 and a drive part 18 of the EFK 12 that is movable relative to it.

[0071] The system 10 comprises a sensor arrangement 28 that is stationarily disposed with respect to the EFK 12. The system 10 comprises an evaluation device 30 that is signal-connected to the sensor arrangement 28 for data transmission from the sensor arrangement 28 to the evaluation device 30.

[0072] The sensor arrangement 28 transmits, for example, a continuous signal to the evaluation device 30, for example in real time or as a periodic signal with a transmission frequency of at least 20 Hz. The sensor arrangement 28 is arranged and configured to generate, in response to at least one feature 32 of the EFK 12, a corresponding output signal 34 that is evaluated by the evaluation device 30 (see Figures 4A-4D).

[0073] The sensor arrangement 28 is configured to generate corresponding output signals 34 in response to at least one feature of the EFK 12 and transmit them to the evaluation device 30. The features 32 of the EFK 12 are present during the movement, in particular during the movement, of the EFK 12 relative to the sensor arrangement 28, in a periodic repeating manner, in particular corresponding to the chain pitch of the EFK 12. The features 32 of the EFK 12 are features 32 that are present in each chain link 26 of the EFK 12, in particular both at the same point on the chain link 26. The features 32 of the EFK 12 are detectable during the movement, in particular during the movement, of the EFK 12 relative to the sensor arrangement 28, in a periodic repeating manner, in particular corresponding to the chain pitch of the EFK 12. For example, the features 32 of the EFK 12 are configured as each lower element of the chain link 26. The features 32 of the EFK 12 are here configured as crossbars 36 of the chain link 26, by way of example. The sensor arrangement 28 is configured to monitor the EFK 12, in particular the features 32 of the EFK 12, preferably of each chain link 26 of the EFK 12, during operation of the EFK 12. The sensor arrangement 28 has three sensors 38, 39, 40 configured to detect the features 32 of the EFK 12 during operation of the EFK 12. The sensors 38, 39, 40 are implemented as capacitive proximity sensors. The sensors 38, 39, 40 of the sensor arrangement 28 are all configured to be functionally identical and structurally identical.

[0074] The evaluation device 30 is configured to determine a distance 42 between two chain links 26 of the EFK 12 from the output signal 34 that the evaluation device 30 receives from the sensor arrangement 28 (see Figs. 4A-4D). The evaluation device 30 is configured to determine an instantaneous speed of the EFK 12, for example of an individual chain link 26, from the output signal 34 that the evaluation device 30 receives from the sensor arrangement 28. The evaluation device 30 is configured to standardize the determined distance 42 between any two chain links 26 by the determined instantaneous speed of the chain links 26. The evaluation device 30 is configured to determine a wear state of the EFK 12, in particular of the chain links of the EFK 12, from the determined, in particular standardized, distance 42 of the chain links 26 of the EFK 12. The evaluation device 30 can additionally be configured to determine a change in the instantaneous speed of the chain links 26 of the EFK 12 from the output signal 34 that the evaluation device 30 receives from the sensor arrangement 28. The evaluation device 30 may additionally be configured to determine a wear condition of the EFK 12, and in particular of the chain links of the EFK 12, from the determined changes in the instantaneous speed of the chain links 26 of the EFK 12.

[0075] The sensor arrangement 28 comprises a plurality of sensors 38, 39, 40 spaced apart from one another in the motion direction 15 of the EFK 12, particularly along the longitudinal axis 14 of the EFK 12, and each of the sensors 38, 39, 40 is positioned to detect the presence of a crossbar 36 passing through the EFK 12, particularly as at least one feature 32 of the EFK 12, and to output a corresponding output signal 34.

[0076] The sensor arrangement 28 comprises three sensors 38, 39, 40 that are spaced apart from one another in the direction of movement 15 of the EFK 12, in particular along the longitudinal axis 14 of the EFK 12, in particular two of them being partially offset from one another in the direction of movement 15 of the EFK 12 and one of them being fully offset from the other in the direction of movement 15 of the EFK 12. The direction of movement 15 of the EFK 12 is aligned parallel to the longitudinal axis 14 of the EFK 12.

[0077] Each of the sensors 38, 39, 40 detects the presence of a feature 32 of the EFK 12, such as a passing crossbar 36. Each of the sensors 38, 39, 40 outputs an output signal 34 corresponding to the detected presence or absence of a feature 32 of the EFK 12, such as a passing crossbar 36 (see FIGS. 4A-4D).

[0078] At least two sensors 38, 39, 40 are provided and / or the two sensors 38, 39, 40 are arranged at a distance corresponding to the nominal, in particular to a new equivalent, chain pitch (see Figs. 3, 4A-4D). The sensor arrangement 28 has at least two sensors 38, 40, which are arranged offset relative to one another along the direction of movement 15, in particular along the longitudinal axis 14 of the EFK 12, at a distance 44 corresponding to the nominal, in particular to a new equivalent, chain pitch. Depending on what type of energy chain the sensor arrangement 28 monitors for a sensor 40 out of the three sensors 38, 39, 40, a different connection interface is provided in the sensor arrangement. The three sensors 38, 39, 40 are arranged offset relative to one another such that the sensors always generate an output signal different from the reference signal as the EFK moves across the sensor arrangement 28. Here, by way of example, the reference signal is configured as "0" and the output signal is configured as "1". Here, the signals, particularly the output signals, of the sensors 38, 39, 40 are illustratively constructed as binary values.

[0079] The system 10 has, for example, an EFK 12 for indirect wear identification at the EFK 12. The geometric centers of the two sensors 38, 40 are arranged offset relative to one another along the direction of movement 15, in particular along the longitudinal axis 14 of the EFK 12, by a distance 44 that corresponds to the nominal, in particular to a new equivalent, chain pitch (see FIGS. 4A-4D).

[0080] The sensor arrangement 28 is stationarily arranged adjacent to the fixed point 16 in the direction of movement 15 of the EFK 12. The sensor arrangement 28 is stationarily connected to a carrier structure, in particular to a rail unit 46 (see FIG. 2). The sensor arrangement 28 is stationarily arranged adjacent to the fixed point 16 for monitoring the upper run 25 of the EFK 12 in the direction of movement 15 of the EFK 12. The stationary fixed point 16 of the EFK 12 is arranged on the lower run 21 of the EFK 12. The sensor arrangement 28 is offset relative to the stationary fixed point 16 in the direction of movement 15 of the EFK 12, in particular along the longitudinal axis 14 of the EFK 12. The rail unit 46 has two rails aligned parallel to the longitudinal axis 14 of the EFK 12, on which the EFK 12 is mounted and to which the sensor arrangement 28 is connected. The stationary fixed point 16 of the EFK 12 is connected to the rail unit 46 offset relative to the sensor arrangement 28 along the longitudinal axis 47 of the rail unit.

[0081] The evaluation device 30 is configured to detect and particularly determine the temporal behavior of the output signals 34 of the sensor arrangement 28, in particular of the individual sensors 38, 39, 40, and / or to detect and particularly determine the instantaneous speed of the individual chain links 26 from the output signals 34.

[0082] The evaluation device 30 is configured to determine the wear state of the connection of the two chain links 26 from the distance 42 of the two adjacent chain links 26, in particular in combination with the instantaneous speed. The evaluation device 30 is configured to evaluate the output signal 34 of the sensor arrangement 28 for deviations from a pre-stored behavior of a brand-new equivalent EFK 12. The evaluation device 30 has a memory module in which data with guide values ​​corresponding to a brand-new equivalent EFK 12 are stored, in particular pre-stored. The evaluation device 30 is configured to determine the distance 42 between successive chain links 26 by measuring the time interval between the detected periodic features 32, and both with reference to the detected instantaneous speed, and to correlate this preferably with a predefined nominal chain pitch for wear identification purposes. The evaluation device 30 is configured to determine the standardized distance 42 between successive chain links 26 by measuring the time interval between the detected periodic features 32, and both with reference to the detected instantaneous speed. The evaluation device 30 is configured to correlate each determined, in particular standardized, distance 42 with a predefined nominal chain pitch for wear identification in the corresponding chain link 26.

[0083] The evaluation device 30 is configured to output a maintenance recommendation depending on the evaluation, in particular as a function of the current detection distance 42 between the periodic features 32. The evaluation device 30 has an output module 48 configured as an optical and acoustic output module 48. The output module 48 is configured partly as a display and / or partly as a speaker. The maintenance recommendation is output partly as an acoustic alarm sound. The maintenance recommendation is configured partly as an optical alarm signal.

[0084] The sensor arrangement 28 and the evaluation device 30 are configured to detect a plurality of consecutive chain links 26 for wear identification in each section. The sensor arrangement 28 is configured to monitor the EFK 12, in particular to detect at least one characteristic 32 of the chain links 26 at all times during operation of the EFK 12.

[0085] FIG. 5 shows a schematic of an example sequence of a process 50 for indirect wear identification in an EFK 12.

[0086] The process 50 has as its key step a single continuous process step 52. For ease of explanation, the simultaneous and repeated or perpetually repeating process steps in the continuous process step 52 are described as two individual sub-steps in the exemplary sequence below.

[0087] In a process step, in particular in the detection step 54, the EFK 12 passing through the sensor arrangement 28 is monitored by the sensor arrangement 28. In a process step, in particular in the detection step 54, an output signal 34 is generated by the sensor arrangement 28 each time a feature 32 is detected in the chain link 26. In a process step, in particular in the detection step 54, each generated output signal is transmitted to the evaluation device 30. In a process step, in particular in the detection step 54, a continuous output signal 34 is transmitted to the evaluation device 30, which adopts a defined value, for example "1", depending on the presence of the feature 32 and a reference value, for example "0", otherwise. In a process step, in particular in the detection step 54, capacitive proximity sensors are used as sensors 38, 39, 40 of the sensor arrangement 28. In one process step, in particular in the detection step 54, the presence of the crossbar 36 passing by the EFK 12 is detected, in particular as feature 32, by each sensor 38, 39, 40 of the sensor arrangement 28, and a corresponding output signal 34 is output. In one process step, in particular in the detection step 54, at least two sensors 38, 39, 40 of the sensor arrangement 28 are used, and / or two sensors 38, 39, 40 of the sensor arrangement 28 are used that are arranged at a distance 44 corresponding to the nominal (equivalent to new) chain pitch. In one process step, in particular in the detection step 54, a sensor arrangement 28 is used that is stationary and arranged adjacent to a fixed point 16 in the direction of movement 15 of the EFK 12.

[0088] In a process step, in particular in the evaluation step 56, the time behavior of the output signals 34 of the sensor arrangement 28, in particular of the individual sensors 38, 39, 40, is detected by the evaluation device 30 and / or the instantaneous speed of the individual chain links 26 is detected by the evaluation device 30 from the output signals 34. In a process step, in particular in the evaluation step 56, the instantaneous speed of the individual chain links 26 is determined by the evaluation device 30 from the time behavior of the output signals 34 of the sensor arrangement 28, in particular of the individual sensors 38, 39, 40. In a process step, in particular in the evaluation step 56, the in particular speed-standardized distances 42 of the individual chain links 26 from one another are determined by the evaluation device 30 from the output signals 34 of the sensor arrangement 28, in particular of the individual sensors 38, 39, 40 and in particular from the time behavior of the output signals 34. In a process step, in particular in the evaluation step 56, the output signals 34 of the sensor arrangement 28 are evaluated by the evaluation device 30 for deviations from a pre-stored behavior of an EFK 12 equivalent to new. In a process step, particularly in the evaluation step 56, at least one preferably speed-normalized distance 42 of the individual chain links 26 from one another is compared by the evaluation device 30 with a pre-stored distance 44 of an equivalent new EFK 12. In a process step, particularly in the evaluation step 56, the distance 42 between successive chain links 26 is determined by the evaluation device 30 by measuring the time interval between the detected periodic features 32 and also with reference to the instantaneous speed detected in any case, and is compared with a predetermined nominal chain pitch, particularly for wear identification purposes. In a process step, particularly in the evaluation step 56, a maintenance recommendation is output by the evaluation device 30 as a function of the evaluation, particularly as a function of the current detected distance 42 between the periodic features 32.

[0089] In one process step, in particular in the evaluation step 56, a number of successive chain links 26 are to be detected by the sensor arrangement 28 and the evaluation device 30 for wear identification in each section.

[0090] In one process step, in particular the continuously repeating step 52, during the operation of the EFK 12 relative to the sensor arrangement 28, in particular during a planned movement, a corresponding output signal is generated by the sensor arrangement 28 which repeats periodically and which is present in response to, in particular the chain pitch of, the EFK 12 and is in particular detectable, in dependence on at least one feature which is present in response to, in particular the chain pitch of, the EFK 12, and which is evaluated by the evaluation device 30. [Explanation of symbols]

[0091] 10. System 11. Base 12 Energy Chain (EFK) 13 End 14 Longitudinal axis 15 Direction of operation 16 fixed points 17 End 18 Drive unit 20 areas 21 Lower Run 22 areas 23 Deflection Arc 24 areas 25 Upper Run 26 Chain Link 28 Sensor Configuration 30 Evaluation Devices 32 Features 34 Output Signal 36 Crossbar 38 Sensors 39 Sensors 40 Sensors 42 distance 44 distance 46 Rail Unit 48 Output Module 50 Process 52 Continuous Process Steps 54 Detection Step 56 Evaluation Steps

Claims

1. A system (10) for indirect wear identification in an energy chain (12) for guiding at least one line (19), such as a cable, a hose, etc., between a stationary fixed point (16) and a movable drive part (18) relative thereto, wherein the energy chain (12) is movable and comprises a stationary lower run (21), a movable upper run (25) and a deflection arc (23) therebetween, and the energy chain (12) is mounted and arranged, in particular, with a sliding upper run (25), and the system (10) comprises preferably a stationary sensor arrangement (28) and an evaluation device (30) signal-connected to the sensor arrangement (28). The sensor arrangement (28) comprises at least two sensors (38, 39, 40), and all of the at least two sensors are arranged and set such that during the operation of the energy chain (12) relative to the sensor arrangement (28), they periodically and repeatedly generate corresponding output signals (34) to be evaluated by the evaluation device (30) in particular according to at least one characteristic present or detectable corresponding to the chain pitch of the energy chain (12). The system (10) in which the evaluation device (30) is set to detect and evaluate the temporal behavior of the output signals (34) of the individual sensors (38, 39, 40).

2. The system (10) according to claim 1, wherein the sensors (38, 39, 40) are spaced apart from each other in the operating direction (15), and each of the sensors (38, 39, 40) is arranged and set to detect the presence of a crossbar (36) passed by the energy chain (12) and output a corresponding output signal (34).

3. The system (10) according to claim 2, wherein the sensors (38, 39, 40) are implemented as capacitive proximity sensors.

4. The system (10) according to claim 2 or 3, wherein at least two sensors (38, 39, 40) of the sensor arrangement (28) are arranged at a distance corresponding to the nominal (new-equivalent) chain pitch and / or are arranged and set to detect a characteristic corresponding to the chain pitch.

5. The system (10) according to claim 2, 3 or 4, wherein the sensor arrangement (28) is arranged stationary adjacent to the fixed point in the operating direction (15) of the energy chain (12).

6. The evaluation device (30) detects the instantaneous speed of individual chain links (26) from the temporal behavior of the output signal (34) and / or The evaluation device (30) comprises three sensors (38, 39, 40), two of the sensors of the sensor arrangement (28) being arranged at a distance corresponding to the nominal chain pitch, and a third sensor being provided for identifying the direction of movement, the system (10) according to any one of claims 1 to 5.

7. The evaluation device (30) evaluates the output signal (34) of the sensor arrangement (28) with respect to a deviation from a pre-stored behavior of an energy chain (12) equivalent to new, the system (10) according to any one of claims 1 to 6, in particular according to claim 6.

8. The evaluation device (30) determines the distance (42) between successive chain links (26) by measuring the time interval between the detected periodic features (32) and with reference to the instantaneous speed detected in each case, preferably comparing this distance to a predetermined nominal chain pitch for the purpose of wear identification, the system (10) according to any one of claims 1 to 7.

9. The evaluation device (30) outputs a maintenance recommendation as a function of the evaluation, in particular as a function of the currently detected distance between periodic features (32), the system (10) according to claim 8.

10. The sensor arrangement (28) and the evaluation device (30) detect a plurality of successive chain links (26) for wear identification in each section, the system (10) according to any one of claims 1 to 9.

11. A process (50) for indirect wear identification in an energy chain (12) for guiding at least one line (19), such as a cable, a hose, etc., between a stationary fixed point (16) and a movable drive part (18) relative thereto, wherein the energy chain (12) is movable and comprises a stationary lower run (21), a movable upper run (25) and a deflection arc (23) therebetween, and the energy chain (12) is mounted and arranged, in particular, with a sliding upper run (25), and a sensor configuration (28) preferably arranged stationary is provided, and an evaluation device (30) signal-connected to the sensor configuration (28) is provided, The sensor configuration (28) comprises at least two sensors (38, 39, 40), and all of the at least two sensors are arranged and set such that during the operation of the energy chain (12) relative to the sensor configuration (28), they periodically and repeatedly generate corresponding output signals (34) in particular in response to at least one characteristic part that exists corresponding to the chain pitch of the energy chain (12). In at least one process step, during the operation of the energy chain (12) relative to the sensor configuration (28), corresponding output signals (34) that are periodically and repeatedly generated and are evaluated by the evaluation device (30) in particular in response to at least one such characteristic part (32) that exists or is detectable corresponding to the chain pitch of the energy chain (12) are generated by the sensor configuration (28). The process (50) in which the evaluation device (30) detects and evaluates the temporal behavior of the output signals (34) of the individual sensors (38, 39, 40).

12. The sensors (38, 39, 40) are arranged spaced apart from each other in the operating direction (15), and in at least one process step, in particular as the at least one characteristic part (32), the presence of a crossbar (36) passed by the energy chain (12) is detected by each sensor (38, 39, 40) of the sensor configuration (28), and a corresponding output signal (34) is output. The process (50) according to claim 11.

13. The process (50) according to claim 12, wherein in at least one process step, a capacitive proximity sensor is used as the sensor (38, 39, 40) of the sensor configuration (28).

14. The process (50) according to claim 12 or 13, wherein the at least two sensors (38, 39, 40) of the sensor configuration (28) detect features corresponding to the chain pitch, and preferably a third sensor is provided, and its output signal is used to identify the direction of movement.

15. The process (50) according to claim 12, 13 or 14, wherein the sensor configuration (28) is arranged stationary adjacent to the fixed point (16) in the operating direction (15) of the energy chain (12).

16. The process (50) according to any one of claims 11 to 15, wherein in at least one process step, the evaluation device (30) detects the instantaneous speed of individual chain links (26) from the temporal behavior of the output signals (34) of the individual sensors (38, 39, 40).

17. The process (50) according to any one of claims 11 to 16, in particular according to claim 13, wherein in at least one process step, the output signal (34) of the sensor configuration (28), in particular of the individual sensors (38, 39, 40), is evaluated for deviations from a pre-stored behavior of an energy chain (12) equivalent to new.

18. The process (50) according to any one of claims 11 to 17, wherein in at least one process step, the distance (42) between successive chain links (26) is determined by the evaluation device (30) by measuring the time interval between the detected periodic features (32) and with reference to the detected instantaneous speed, and is preferably compared to a predetermined nominal chain pitch for the purpose of wear identification.

19. The process (50) according to claim 18, wherein in at least one process step, maintenance recommendations are output by the evaluation device (30) as a function of the evaluation, in particular as a function of the currently detected distance (42) between periodic features.

20. The process (50) according to any one of claims 11 to 19, wherein in at least one process step, a plurality of successive chain links (26) are detected by a sensor arrangement (28) and an evaluation device (30) for wear identification in each section.

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