EP3972737B1 - Method for monitoring a high-pressure roller grinder - Google Patents

Description

• wobei die Walzenpresse zwei rotierend angetriebene Presswalzen aufweist, zwischen denen ein Walzenspalt gebildet ist, dessen Spaltweite während des Betriebes veränderlich ist,
• wobei während des Betriebes mit einem oder mit mehreren Messwert-Aufnehmern Betriebsdaten der Walzenpresse ermittelt und auf einem Rechner gespeichert werden.

The invention relates to a method for monitoring (the status/operating status) of a high-pressure roller press during the crushing, compacting or briquetting of material,

• wherein the roller press has two rotatingly driven press rollers, between which a roller gap is formed, the gap width of which can be changed during operation,
• operating data of the roller press being determined during operation with one or more measured-value sensors and stored on a computer.

Such a high-pressure roller press for the comminution of material is also referred to as a high-pressure roller mill. However, the invention also relates to high-pressure roller presses for compacting or briquetting material. The material is in particular highly abrasive material, e.g. B. ore, cement clinker, slag or ceramic base materials. The roller press can also be used for compacting e.g. B. fertilizers are used. One of the press rollers is preferably designed as a fixed roller and is consequently rotatably mounted in a stationary manner in a press frame. At least one press roller is designed as a loose roller, ie it is connected via force generating means, e.g. B. via hydraulic cylinders, with variable gap width during operation against the other roll, z. B. the fixed roller is adjustable. The two press rollers are driven in opposite directions (synchronously) by drives. The gap between the rollers arises—due to the described adjustment of the loose roller against the fixed roller—until a pressure corresponding to the adjustment forces acts between the rollers. The gap width results by the ratio of the contact forces to the reaction forces emanating from the material to be processed. Each press roll has z. B. a rotatingly driven roller core and a bandage attached to the roller core, which forms the (wear-resistant) surface of the roller. The bandage can be designed as a completely circumferential (one-piece) ring or, alternatively, can be formed from several segments attached to the core. However, press rolls or work rolls can also be used which are not designed with separate bandages, but instead, for example, in one piece or segmented. The press rolls are always equipped with a (wear-resistant) roll surface on the peripheral surface as a working surface.

In practice, it is customary to continuously or quasi-continuously monitor, control and, if necessary, visualize the state or operating state of a high-pressure roller press. For this purpose, the roller press is equipped with sensors that record various operating data of the roller press. B. can be stored on a computer and / or visualized in a control room of the system. So e.g. B. measured the torque of the press rollers, the hydraulic pressures in the cylinders of the loose roller and the gap width with suitable transducers or sensors, the transducers / sensors z. B. with a control device, z. B. a programmable logic controller (PLC), which in turn is connected to a control room of the system or with a computer arranged in the control room.

From the DE 101 06 856A1 a high-pressure roller press for bed crushing is known, in which the drive and movement parameters of at least one roller are measured as control parameters during operation, wherein the ratio of these values to one another is formed and this ratio is always kept essentially constant by reducing or increasing the roller contact pressure force of the rollers. For this purpose, e.g. B. measured during operation, the drive power of a main motor and the peripheral speed of the rolls and the ratio of these used as a controlled variable.

The DE 42 26 182 A1 describes a high-pressure roller press in which the bearing blocks of the floating roller are supported against hydraulic cylinders of a hydropneumatic system, with sensors being provided for measuring the width of the roller gap that occurs on the two roller sides during operation. The sensors are used to measure the distance between the bearing blocks of the two rollers and the signals obtained are fed via lines to the inputs of a monitoring and control unit. The sensors measure the distance between the bearing blocks that occurs during operation of the machine and thus also the width of the nip that occurs during operation on both sides of the roll, either continuously or in a timed manner, and the difference between the two measured values is calculated and compared with a specified tolerance value. If there is an asymmetrical load on the nip, e.g. If, for example, the bearing block of the floating roller moves inwards and the floating roller is misaligned so that the specified tolerance value is exceeded, a control intervention is carried out via the central monitoring and control unit, in this case relating to the feeding of the roller gap, by actuating servomotors for metering flaps set at the feed chute.

The monitoring of the operating status of rotating rollers in an industrial plant is z. B. also in the WO 2007/025395 A1 described, namely for mills for grain processing. Vibrations are monitored and a time-varying electrical signal is generated from them, which is subjected to a frequency analysis. The detection of the vibrations can, for. B. by means of an acceleration sensor attached to the bearing of the rotating roller. The analysis can be done with a computer that can also be integrated into a control system of an automated industrial plant, which z. B. can also have monitoring screens for displaying the operating status. The industrial plant can also have several rotating rollers and several systems, the individual systems being networked with one another and with a monitoring centre, e.g. B. wirelessly networked.

The WO 2018/036978 A1 describes a self-optimizing, adaptive production processing system with a grinding system that contains a roller press, with at least one sensor for acquiring measured values relating to a state of at least one roller being provided, so that measured values are acquired that characterize a state of the roller. With a data receiver of a control unit of the production processing system, measured values are received from a data transmitter of the measuring device of at least one roll. The roller operation and the width of the gap between the rollers and/or the parallelism of the rollers are automatically optimized by the control unit or by a control device connected to the control unit based on the measured values received.

From the DE 10 2007 004 004 B4 a roller mill with two counter-rotating grinding rollers is known, which is equipped with pin-shaped profile bodies and in which an autogenous wear protection layer is formed. The roller mill has a monitoring device which checks the state of wear of the pin-shaped profile bodies and the state of the autogenous anti-wear layer and also the presence or absence of pin-shaped profile bodies notes. For this purpose, the roller mill can have at least one sensor, which can be arranged such that it can be moved with respect to the grinding roller.

The monitoring of the operating status of machines is z. B. also in the WO 2017/197449 A1 described, with a large number of parameters of the machine being measured and thus measured values being made available, with normalized indicator values being generated from these measured values and with these normalized indicator values being used to describe the state of the machine. Corresponding machine modules, each equipped with a computer, can be assigned to individual machines. The individual machine modules can be connected to a common system module via a network. In addition, machine modules from different plants can also be connected directly to a central monitoring system, which collects sensor data from a large number of machine modules from several plants, which can also be geographically widely distributed, so that methods of the "Internet of Things" can be used.

The US 2005/0049801 A1 deals with the monitoring of machines with moving components, with a locally arranged analysis computer being provided in the area of the machine, with which measured values can be recorded and evaluated. The evaluated data can be transferred to a remote, external computer.

In the DE 10 2008 046 921 A1 a method for monitoring the load condition of a grinding plant with rotating grinding elements is described. In addition to monitoring those acting on the grinding organ dynamic force, the drive torque determined from power and speed is also monitored.

Finally revealed the WO 2018/036978 A1 a monitoring and control device for the automated optimization of the grinding line of a roller system and a corresponding method.

Other methods for monitoring roller presses are from CN 104549704A and the CN 207887239 U known.

The US7182283B1 also describes a system with roller mills with driven grinding tables and the monitoring of such a system.

Overall, there is a need in machine and plant engineering to monitor and visualize the condition of machines. In practice, this is usually done in connection with high-pressure roller presses by collecting the sensor data using conventional programmable logic controllers that are connected to a control room in the plant.

Incidentally, so-called higher-level solutions are known in which operating data from machines is stored centrally, e.g. in a cloud, and evaluated if necessary, so that different end devices, e.g. B. laptops, tablets or smartphones, can be accessed via the Internet on the data.

Based on the prior art, the invention is based on the technical problem in connection with high-pressure roller presses for the crushing, compacting or briquetting of Material are intended to create a method that allows a simple, safe and reliable monitoring of a condition or operating condition of the high-pressure roller press.

• dass die Betriebsdaten (die mit dem oder den Messwert-Aufnehmern ermittelt werden) als Rohdaten auf einem lokal im Bereich der Walzenpresse angeordneten und mit der Walzenpresse bzw. mit dem Sensor oder mit den Sensoren verbundene Edge-Computer als Analyserechner gespeichert werden,
• dass die Betriebsdaten bzw. Rohdaten auf dem Analyserechner mit Analysealgorithmen ausgewertet und damit Kenndaten der Walzenpresse erzeugt und diese Kenndaten auf dem Analyserechner gespeichert werden,
• wobei die Kenndaten von dem Analyserechner über ein drahtloses Netzwerk (d.h. drahtlos) an zumindest ein Endgerät übermittelt und auf dem Endgerät angezeigt bzw. visualisiert werden.

To solve this problem, the invention teaches in a generic method for monitoring a high-pressure roller press of the type described above,

• that the operating data (which are determined with the measured value recorder or sensors) are stored as raw data on an edge computer arranged locally in the area of the roller press and connected to the roller press or to the sensor or sensors as an analysis computer,
• that the operating data or raw data is evaluated on the analysis computer with analysis algorithms and thus characteristic data of the roller press is generated and these characteristic data are stored on the analysis computer,
• wherein the characteristic data are transmitted from the analysis computer via a wireless network (ie wirelessly) to at least one end device and are displayed or visualized on the end device.

The analysis computer or edge computer is preferably wired with at least one connecting cable to the measured value recorder(s) arranged on the roller press.

The invention is based on the finding that it is advantageous to first store the operating data determined with the measured value recorders as raw data on a powerful edge computer, which is stationed locally in the immediate vicinity of the roller press and is particularly preferably connected to a cable connected to the sensors. However, this edge computer is not only used to store the operating data as raw data, but also the analysis or evaluation of the raw data is carried out directly on the edge computer using appropriate algorithms that are stored on the edge computer. There is no storage of the operating data or raw data in a higher-level network or in a cloud, nor is there any transmission of the raw data via the Internet. Rather, an analysis is already carried out locally using suitable algorithms and the (compressed) characteristic data generated from this raw data using the algorithms is stored. B. can be collected in a database on the analysis computer and made available from there (e.g. for retrieval with a terminal). The raw data is preferably stored redundantly on local storage media, e.g. B. Edge computer hard drives. Basically known and available hardware can be used, ie powerful edge computers with large data memories and powerful processors can be used, it being possible to fall back on the fundamentally known principles of "edge computing".

A large number of basically known sensors can be used in or on the press to determine and store the operating data, e.g. B. Measured value recorders or sensors for determining the torque of one or both rollers, the hydraulic pressure in or in the cylinders for the adjustment of the floating roller, position sensors and/or displacement sensors for determining the gap width of the roller gap and/or for determining the absolute position the loose roller or the position of the loose roller relative to a stationary press frame, with position sensors z. B. are arranged in the bearing points of the floating roller and / or the fixed roller. In addition or as an alternative, temperature sensors, flow sensors, etc. can be used come. The sensors can record analogue measured values, e.g. B. as current signals, which are wired via a suitable detection device, z. B. be transformed into digital data via a converter, so that digital raw data is stored on the edge computer. It is important that the processing and analysis of the raw data is carried out on the local analysis computer ("edge computing"). Alternatively, however, sensors with a digital output can also be used, which output the signal as a coded pulse train, for example.

The roller press characteristics generated on the edge computer by applying the stored algorithms are accessible via a wireless network, e.g. B. via the Internet, can be accessed online or they can be transmitted to end devices via the wireless network (wirelessly). The terminals can be z. These could be external PCs, notebooks, tablets or smartphones, for example. Of course, access to the identification data for the purpose of information or visualization on the end device is only possible with appropriate access authorization. In a preferred embodiment, the edge computer is connected to a router, e.g. B. industrial router connected via which a connection to a wireless network, z. B. to the Internet, so that online access to the identification data stored in the database on the edge computer is possible. In a preferred development, the retrieval or access does not take place directly via the industrial router, but via an external portal that is wireless, e.g. B. is connected to the industrial router via a VPN connection (Virtual Private Network). So e.g. For example, authorized persons can access the portal via suitable end devices with an https connection and access the key data from there (via VPN) via the industrial router. Optionally, there is also the possibility, e.g. B. to connect a computer to the portal via a VPN network for remote maintenance. Via simple https connections, there is usually only the (for authorized persons). Possibility to retrieve the identification data and consequently visualize information on the terminal. Via the VPN connection, e.g. B. the possibility to access the edge computer for remote maintenance. Appropriate access rights are of course assigned for the portal and the end devices, with the traceability of the accesses being registered by means of logs.

As characteristics z. B. directly concrete data of the machine, z. B. the nip, the power consumption or the like are currently displayed and visualized. Alternatively or in addition, statistical evaluations can be made available as characteristic data, e.g. B. Weekly or monthly reports on the machine status.

In a particularly preferred embodiment, however, the characteristics are not simple machine data or evaluated or compressed measurement data that relate directly to a measurement variable of a sensor (e.g. power, gap width or the like), but are particularly preferably via appropriate algorithms special conditions, e.g. B. critical states are determined and visualized or evaluated.

Preferably, the operational data and consequently the raw data with a high sampling rate of more than 50 Hz, e.g. B. recorded more than 100 Hz, preferably at least 200 Hz and stored on the analysis computer. The invention is based on the finding that the programmable logic controllers (PLCs) commonly used in practice, which are connected to the sensors, generally cannot provide, process and store the measurement data at high speed or a high sampling rate . According to the invention, the data is preferably forwarded directly by the sensors without an interposed PLC the edge computer or to an evaluation unit connected to the edge computer or integrated into the edge computer, which is suitable for recording and storing the operating data with the high sampling rate. 50 Hz means that 50 readings per second (ie one reading every 20 ms) are made available. The invention has recognized that specific operating states, malfunctioning states or critical states can only be determined, or particularly easily, if the operating data are made available with a correspondingly high sampling rate. This creates extremely large amounts of data. However, since these are stored locally and wired on the edge computer directly on site, these amounts of data can be handled without any problems. Access to this large amount of raw data via a wireless network is not necessary, since the large amounts of data are initially compressed by suitable evaluations on the edge computer, so that the user only has to access the compressed or evaluated data via a wireless network. In principle, it is possible to record only one measured value (or type of measured value) as raw data and to determine one or more characteristic data from it using an analysis algorithm. However, several different operating data are preferably recorded as raw data and evaluated with an analysis algorithm in the sense of a linking evaluation.

Of particular importance is the recording of the measured values with a high sampling rate, e.g. B. in the detection of a foreign body passage through the nip. The invention has recognized that an analysis of the high-frequency recorded operating data surprisingly detects the passage of a foreign body through the nip of the high-pressure roller press, particularly when several (different) measured values are recorded and evaluated as raw data and the Characteristics are determined by linking the signals or raw data using an algorithm. In particular, the torque of a press roll or the torques of both press rolls can be used as operating data. As a rule, the torques of the press rollers are constant within certain limits during operation. The roll gap is also kept essentially constant by the type of adjustment of the loose roll described above. Because in a high-pressure roller press, z. B. Material bed roller mill, the supplied particles of the feed material are not broken between the surfaces of the two rollers as in a crusher, but they are pressed in a material bed or material bed under high pressure and thus crushed or agglomerated highly efficiently. The nip is consequently larger than the material to be processed and passed through the nip. Surprisingly, it was found that the signals or signal changes of suitable operating data (e.g. torque, hydraulic pressure and/or gap width) are recognized despite the very high inertia of the rotating masses and despite the weight of the rollers and in particular the floating roller and despite the friction between the roller bearings and the frame according to the invention, particularly preferably due to the high sampling rates and in a further preferred embodiment by linking a plurality of signals or a plurality of different operating data using suitable algorithms. For example, by evaluating the raw data recorded at high frequency, the invention has established that when foreign bodies pass through, there is a brief increase in the torque on one roller or on both rollers. With the programmable logic controllers used in practice up to now and the visualization tools provided on the master computer, such short-term torque fluctuations have not been recognized so far. However, using a suitable algorithm, the edge computer can now detect the passage of foreign bodies on the basis of the raw data recorded at high frequency determine that e.g. B. easily foreign body passages can be counted. In principle, it is possible to record and evaluate only the torque of one or both rollers as raw data. In addition to the torque or torques, further operating data are particularly preferably recorded and evaluated, eg the gap width at one or more gap positions and/or the hydraulic pressure of one or more hydraulic cylinders with which the loose roller is set against the fixed roller. The evaluation and, for example, foreign body detection can consequently be significantly improved by a combined or linked evaluation of several measured values (or several types of measured values). The advantages described can be realized equally with different machine types, eg roller mills, briquetting machines and compacting machines.

About the terminals z. For example, the operating data for the torque is not accessed, but only the result of the evaluation and consequently the number of foreign body passages that are counted or summed up, or a message can be sent to a terminal device if a foreign body passage has been registered. This can e.g. B. carried out a further evaluation of the foreign body passages, so that z. B. repeatedly occurring foreign body passages, irregularities or the like can be analyzed and identified. This can e.g. B. to draw conclusions about the operation of upstream or other system components, e.g. B. an upstream crusher. If it z. If, for example, temporary disruptions occur in an upstream crusher, the loading of the press with undesirably large parts can increase and this would in turn have to be determined by the foreign body detection.

Overall, the configuration according to the invention enables the processes to be optimized from the point of view of "Industry 4.0" or the "Internet of Things". The roller press can be expanded into a "talking" machine. Programmed algorithms are used here, with algorithms or methods of artificial intelligence ("AI") and consequently self-learning or self-optimizing algorithms also being used if necessary.

The described high-frequency sampling of the torque is - as described - just an example of the data analysis according to the invention, z. B. to monitor the passage of foreign bodies through the nip. Alternatively, another measured value can also be analyzed and evaluated for this purpose. There is also the possibility of evaluating the hydraulic pressure at the hydraulic cylinders that act on the floating roller at high frequency. Such an evaluation can also be used to evaluate short-term fluctuations in the course of the passage of a foreign body. The evaluation result can be further improved by analyzing a first operating parameter in combination with a second operating parameter and drawing conclusions about the respective event using an algorithm. In particular, it can be expedient to combine the development of the torque with a measurement of the roll gap. In the same way, a measurement of the hydraulic pressure can be combined with the roll gap.

A further example of the monitoring of a state of the roller press according to the invention is the monitoring of the state of wear of the roller surfaces (eg the bandages) of the high-pressure roller press. Since the usually registered roller gap is adjusted with the help of the hydraulic cylinders in such a way that it is largely the same during operation is kept constant, it is not possible to draw conclusions about the state of wear of the rolls or their roll surfaces (e.g. drums) by recording the roll gap. According to a further proposal of the invention, it is therefore provided that the position of the floating roller is recorded as a function of time with one or more position sensors and the data is stored on the analysis computer. With an algorithm, the wear condition of the roll surface can be determined from the measured data and a forecast for a remaining service life of the roll surface can be generated. The position sensors preferably detect the position of the bearing points of the floating roller, which in this embodiment means an absolute measurement of the position of the floating roller or its bearing points, ie a determination of the position relative to a stationary reference system, e.g. B. the press frame. While the gap width of the press nip does not or should not change during operation, since the wear of the roll surface/bandage causes the floating roll to be increasingly adjusted against the fixed roll, the wear on the roll surfaces can be measured very easily using the determine the changing position of the loose roller. Because with increasing wear of the roll surfaces and consequently with decreasing work roll diameter, the loose roll is increasingly adjusted against the fixed roll, so that the position of the bearing points of the loose roll approaches the position of the bearing points of the fixed roll. The position of the bearing points of the floating roll is therefore a good measure of the decrease in roll diameter and thus of the wear condition of the roll surfaces. With the help of an algorithm, a prediction for a remaining period of use of the roller or the roller surfaces can be generated on the basis of previously made available data or empirical values. In this way, maintenance predictions (predictive maintenance) can be created with the invention.

The subject matter of the invention is not only the method described, but also a system for crushing, compacting or briquetting material according to claim 10. It is therefore not only the method but also the system that is protected, which uses an edge computer of the described Art is equipped, this edge computer is equipped with appropriate programs for data processing and / or algorithms that are set up to carry out the method described.

Fig.1

schematisch stark vereinfacht eine erfindungsgemäße Anlage mit einer Walzenpresse,

Fig. 2

eine Darstellung des Drehmomentes und der Spaltweite als Rohdaten in Abhängigkeit von der Zeit,

Fig. 3

eine Darstellung der Loswalzenposition und des Verschleißzustandes zur Wartungsvorhersage.

The invention is explained in more detail below with reference to drawings which merely represent exemplary embodiments. Show it:

Fig.1

schematically greatly simplified a system according to the invention with a roller press,

2

a representation of the torque and the gap width as raw data as a function of time,

3

a representation of the loose roller position and the state of wear for maintenance prediction.

In 1 a system for monitoring a state of a high-pressure roller press 1 is shown as an example, this high-pressure roller press 1 z. B. is intended for crushing granular material, alternatively for compacting or briquetting of material. The roller press has a press frame 2 and two press rollers 3a, 3b which are rotatably mounted in the press frame 2 and are driven in opposite directions to rotate. A nip is formed between the press rolls, the gap width of which can be changed during operation. Because one of the two press rollers is designed as a stationary roller 3a mounted in the press frame 2 and the other The press roller is designed as a loose roller 3b, this loose roller having power generating means, e.g. B. hydraulic cylinder 4 against the fixed roller 3a is adjustable, so that the gap width of the nip can change during operation. The roll gap adjusts during operation as a function of the contact forces of the floating roll against the fixed roll until an equivalent pressure acts between the rolls. Each of the two press rollers 3a, 3b can be designed as a solid roller or segmented roller or preferably have a driven roller core on the one hand and a bandage (e.g. ring bandage) arranged on the roller core on the other hand, which B. is equipped with a wear-resistant surface. Details are not shown in the figures.

Such a roller press 1 can be connected in the usual way to a programmable logic controller or PLC 5, which in turn can be connected to a higher-level system controller or a control room 6. The operation of the roller press 1 can be controlled and monitored in a known manner via the control room 6 . For this purpose, the PLC 5 can be connected on the one hand to the drives of the roller press and on the other hand to various measured-value recorders.

According to the invention, however, a special computer is provided as an alternative or in addition to the programmable logic controller 5, namely an edge computer as an analysis computer 7, which is wired via one or more connecting cables 8 to measured value sensors 9 of the roller press. This edge computer or analysis computer 7 is stationed locally in the immediate vicinity of the roller press. The operating data registered with the measured value recorders 9 are stored as raw data on this analysis computer 7 . For this purpose, the measured value recorders 9 can be equipped with (additional) measuring devices or measuring cards 10, with which the analog measurement data are converted into digital operating data R. Optical connecting cables, for example optical waveguides, can preferably be used to connect the measuring card 10 to the analysis computer 7 for particularly fast data transmission. The analysis computer 7 is provided as an edge computer with large data memories 11, processors 12 and specially designed algorithms 13 for the analysis and evaluation of the operating data. A plurality of storage media 11 for redundant data storage are preferably provided in the analysis computer 7 . The raw data R are stored on the analysis computer 7 and evaluated with the analysis algorithms 13 and characteristic data K of the roller press 1 are thus generated, which are also stored on the analysis computer. According to the invention, these characteristic data K are transmitted from the analysis computer 7 via a wireless network 14 to one or more terminals 15, e.g. B. PCs, tablets, smartphones or the like, ie the terminal devices 15 can be used to access the characteristic data K. It is of particular importance that appropriately authorized users via the terminals 15 only have to access the characteristic data K that have already been evaluated and not the very extensive raw data. For this purpose, the characteristics K in the analysis computer 7 in z. B. a database are stored as compressed data and are provided in the database for online access via PC, smartphone or the like, namely z. B. for corresponding system status displays.

In this case, the operating data R can be recorded in a conventional manner using known measured value sensors 9 that are optionally provided in the area of the roller press anyway, namely, for example, B. the torque of a press roller or both press rollers, the hydraulic pressure of the hydraulic cylinder for the loading of the floating roller, position sensors for determining the variable nip, position sensors for the Determination of the absolute position of the floating roller or the position of the floating roller relative to the stationary press frame, load cells, temperature sensors, flow rate sensors or the like. About the terminals 15 z. B. in a simple manner, the respective state of the roller press 1 or values of the sensors 9 mentioned are displayed in a condensed form, so that a current machine status can be visualized. Alternatively, statistical evaluations can be queried on terminal 15, which, however, are not generated on terminal 15 but on analysis computer 7, e.g. B. individual weekly reports, monthly reports or the like. In a particularly preferred manner, however, the method according to the invention can be used to monitor disruptive states, unusual states or the like.

For this purpose, it is particularly advantageous if the operating data is raw data R with a high sampling rate of more than 100 Hz, e.g. B. recorded more than 200 Hz and stored on the analysis computer 7. This results in large amounts of data, which, however, are transmitted by cable over short distances directly to the locally positioned analysis computer 7, where they are stored and already evaluated. The analysis algorithms 13 already mentioned generate the desired characteristic data or characteristic values K from the very large amounts of data. B. can be accessed via the Internet.

where is in 1 shown that the computer 7 is connected to an industrial router 16 for online access, which in a preferred variant is connected to a portal 18 via a VPN network or a VPN connection 17 . The terminals 15 consequently do not access the industrial router 16 directly for querying the evaluated characteristics, but access the portal 18, e.g. B. via secure or encrypted https connections 19. Furthermore, an additional computer or PC 21 can optionally be connected to the portal 18 via an additional VPN connection 20, so that not only data is queried via this PC in the sense of remote maintenance, but also to the analysis computer 7 or to the Roller press can be accessed.

In 1 it is also indicated that field data F and consequently data from other components of the system, e.g. B. a grinding plant A, can be detected, z. B. Operating data of a crusher.

Finally, it is indicated that data, commands or the like can also be transmitted from the analysis computer 7 to the roller press 1 or other components of the system. So e.g. B. the evaluated characteristic data can be used for controlling or regulating the press or other machines.

Examples of preferred applications of the system described or the method described are based on the figures 2 and 3 be explained.

So can according to 2 for monitoring the passage of a foreign body through the roller gap, the torques and/or the gap widths of the two press rollers 3a, 3b are recorded and evaluated as operating data. In 2 For example, the torques M of the two rolls on the one hand and the gap widths W (at two different locations in the press nip) on the other hand are plotted (as raw data) as a function of time t, specifically in the case of a foreign body passing through the roll nip. This was done in the manner already described, a high-frequency sampling and storage with z. B. 200 readings per second. In the course of a When a foreign body passes through the roller gap, there is a brief increase in the torque M and the gap width W. As in 2 recognizable, such a foreign body passage can be recognized and evaluated on the basis of the raw data. What is interesting, however, is the fact that the user does not have to access this raw data R, but rather that an evaluation is already carried out in the edge computer 7 with the analysis algorithms 13, so that only a foreign body passage that has taken place has to be stored and displayed as characteristic data K. It is therefore possible to determine and "count up" such foreign body passages in the analysis computer using (linking) algorithms. The passages of foreign bodies determined in a specific period of time can be accessed via the terminals 15 in the sense of a query. Alternatively, there is also the possibility of sending messages to the terminal devices 15 in the event of a foreign body passing through. In principle, it is possible to monitor the passage of foreign bodies (only) to monitor the torques on the two rollers and to evaluate them using an algorithm. At least one other measured value is preferably also recorded, e.g. B. the nip and / or the hydraulic pressure of the hydraulic cylinder for acting on the loose roller. As already described, foreign body passages can be registered particularly preferably by combined or linked evaluation of several measured values with the aid of the algorithm.

Another possible application concerns wear monitoring or maintenance forecasts, e.g. B. monitoring the wear of the roller press drums. For this z. B. monitors the absolute position of the floating roller 3b with one or more position sensors. The position of the loose roller relative to a stationary press frame 2 is referred to as the position of the loose roller 3b. For this z. B. Position sensors in the area of the bearing points be arranged the loose roller. In 3 the position of a bearing point is shown at the top left as a function of time. The absolute position of the floating roller 3b is detected with one or more position sensors. The position of the loose roller relative to a stationary press frame 2 is referred to as the position of the loose roller 3b. For this purpose, for example, position sensors 9 can be arranged in the area of the bearing points of the loose roller 3b. In 2 The position of a bearing point is shown as a function of time t at the top left. It can be seen that these raw data R are first recorded at high frequency and stored on the analysis computer 7 . From this, this generates the characteristic data K, which are plotted in the graphic below. It is a measure of the wear V of the roll surface, eg the bandage, and it can be seen that this measure increases with increasing service life, since the work roll diameter, eg the bandage diameter, decreases due to the wear V. When a certain upper limit value is reached, the rollers or the roller surfaces, for example the bandage, are exchanged. This is recognizable by the abrupt drop at the points shown. While the raw data R actually relate to the position data, the characteristic data K are data that represent the state of wear V of the roll surfaces. In this way, maintenance predictions can be made.

Claims (10)

1. Method of monitoring a high-pressure roller press (1) during the course of comminution, compacting or briquetting of material,

   wherein the roller press (1) comprises two rotating driven press rollers (3a, 3b), between which a roller gap is formed, the gap width of which is changeable during operation,

   wherein during operation, with one or more measurement elements (9), operating data of the roller press (1) are determined and saved on a computer,

   characterised in

   that the operating data are stored as raw data (R) on an edge computer as an analysis computer (7) arranged locally in the area of the roller press (1) and connected to the measurement elements (9),

   that the raw data (R) are evaluated on the analysis computer (7) with analysis algorithms and thereby characteristics (K) of the roller press (1) are produced and these characteristics (K) are stored on the analysis computer (7),

   wherein the characteristics (K) are transmitted from the analysis computer (7) via a wireless network (14) to at least one terminal device (15) and are displayed on the terminal device (15).
2. Method according to claim 1, characterised in that the analysis computer (7) or edge computer is wire-connected with at least one connection cable (8) to the measurement element(s) (9) arranged on the roller press (1), wherein preferably fibre optic cables are used.
3. Method according to claim 1 or 2, characterised in that the operating data are recorded as raw data (R) with a high sampling rate of more than 50 Hz, e.g. more than 100 Hz, preferably at least 200 Hz, and stored on the analysis computer (7).
4. Method according to any one of claims 1 to 3, characterised in that the torque of a press roller (3a, 3b) or both press rollers (3a, 3b) is recorded and stored as operating data.
5. Method according to any one of claims 1 to 4, characterised in that the hydraulic pressure on the force-generating means of a press roller (3a, 3b) is recorded and stored as operating data and/or in that the gap width of the roller gap and/or the absolute position of a press roller (3a, 3b) is/are recorded and stored as operating data.
6. Method according to any one of claims 1 to 5, characterised in that the measurements of different measurement elements (9) are recorded and saved as raw data, wherein the characteristics (K) are evaluated and saved with the analysis algorithms using different operating data of several measurement elements (9).
7. Method according to any one of claims 1 to 6 for monitoring a foreign body passing through the roller gap, characterised in that operating data are recorded which change as a function of time during the passage of a foreign body through the roller gap, e.g. torque and/or gap width and/or pressure, and in that with an analysis algorithm foreign body passages are determined from the operating data.
8. Method according to any one of claims 1 to 7, characterised in that with the terminal device (15), e.g. a PC, notebook, tablet computer, smart phone or suchlike, a router (16) connected to the analysis computer (7) is accessed, preferably a portal connected to the router (16) via a VPN connection (17).
9. Method according to any one of claims 1 to 8 characterised in that the characteristics (K) for controlling or regulating the roller press (1) or another machine within an industrial plant, e.g. a grinding plant, compacting plant, briquetting plant, into which the roller press (1) is integrated, are used.
10. Plant for comminuting, compacting or briquetting material with a method according to any one of claims 1 to 9 with at least

    a roller press (1) which comprises two rotating, driven press rollers (3a, 3b), between which a roller gap is formed, the gap width of which is changeable during operation,

    one or more measurement elements (9) with which operating data of the roller press (1) can be determined,

    and an edge computer as analysis computer (7) locally positioned in the area of the roller press (1) and connected with the roller press (1) or with the measurement elements (9),

    wherein the operating data can be stored as raw data (R) on the edge computer and wherein the raw data (R) can be used with analysis algorithms on the analysis computer (7) and thereby characteristics (K) of the roller press (1) can be produced and these characteristics (K) can be stored on the analysis computer (7), whereby the characteristics (K) can be transmitted from the analysis computer (7) via a wireless network (14) to at least one terminal device (15) and displayed on the terminal device.

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