EP4308301A1 - System und verfahren zum überwachen eines verschleiss an komponenten einer mahlanlage - Google Patents
System und verfahren zum überwachen eines verschleiss an komponenten einer mahlanlageInfo
- Publication number
- EP4308301A1 EP4308301A1 EP22717375.4A EP22717375A EP4308301A1 EP 4308301 A1 EP4308301 A1 EP 4308301A1 EP 22717375 A EP22717375 A EP 22717375A EP 4308301 A1 EP4308301 A1 EP 4308301A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grinding
- wear
- future
- maintenance
- grinding plant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
- B02C4/06—Crushing or disintegrating by roller mills with two or more rollers specially adapted for milling grain
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
- B02C4/08—Crushing or disintegrating by roller mills with two or more rollers with co-operating corrugated or toothed crushing-rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C2210/00—Codes relating to different types of disintegrating devices
- B02C2210/01—Indication of wear on beaters, knives, rollers, anvils, linings and the like
Definitions
- the invention relates to a system and a method for monitoring wear and tear, in particular a system and a method for technical maintenance based on dynamic monitoring, of components of a milling or rolling plant or other comminuting device.
- the invention relates to a system and a method for monitoring wear on a surface of grinding rolls, in particular of roll profiles in fine mills.
- the invention also relates to a grinding plant with such a system.
- Smooth rollers are used for dissolving, with which the flour and peel parts are separated from each other.
- the grain goes through eight to twelve passages before the flour is detached from the husk.
- a feed roller feeds it to the grinding gap, ensuring a constant volume flow. This is formed by two horizontally or diagonally parallel rollers that (like gears) rotate in opposite directions.
- FIG. 1 shows a roller mill partly in elevation and partly in section.
- the material is fed to the crushing rollers a and b by means of the feed rollers c and d.
- the latter runs at the same peripheral speed as the crushing roller b, so that the material cannot accumulate on the rollers and thus no higher loading of the grinding surfaces can take place.
- a slider f can be adjusted by means of an adjusting screw e in such a way that the feed roller c only supplies as much material to the feed roller d as the latter can pass on to the shredding rollers a and b.
- the mills are now fitted with a
- Automatically pressing brushes for example, can be used to clean the rollers.
- a sensor is arranged inside a grinding roller.
- the sensor is designed to record measured values that characterize a state of the rollers. In particular, this can be a condition of a peripheral surface of the rollers.
- the condition can be, for example, a temperature, a pressure, a force
- a data transmitter is also provided for contactless transmission of measured values from the sensor to a data receiver and further to a control unit or a higher-level control system for evaluation, as a result of which the grinding plant or part of it can be controlled and regulated.
- a warning message can be output by the control unit if a predefined warning criterion is met.
- the warning criterion can be, for example, that the measured value exceeds a specified limit value. If the warning criterion is met, a warning signal can be output or the grinding plant can be brought to a standstill, for example by the control unit. With this monitoring method, however, influences outside the grinding roller are ignored. This can lead to unwanted downtimes, a loss of yield and excessive maintenance costs.
- the document EP 3500370 A1 discloses a grinding system with grinding rollers, which has a plurality of sensors in the rollers for acquiring measured values that describe a state of the rollers, and which is designed for the operation of the
- the sensors are designed, for example, as temperature sensors for determining a temperature profile of the rolls, as vibration sensors for detecting roll vibration and as accelerometers for monitoring a speed, acceleration or deceleration of the rolls and transmit their measured values to the control unit.
- the control unit includes a machine-learning unit with which the roll operation, such as the width of a gap between two rolls or the parallelism of the rolls, is automatically optimized based on the measurement data received.
- the machine-learning unit is also used to determine the remaining service life and a state of wear of the rollers.
- the machine-learning unit can include a monitoring unit for monitoring the received measured values and a learning unit. The monitoring unit detects z.
- the learning unit carries out the learning process by linking the actual and target values. This allows the operation of the grinding plant to be optimized using the machine-learning unit with regard to the shape, twist and surface condition of the rolls. The remaining service life and the state of wear of the components of the grinding plant are taken into account. However, no statement is made on the optimization of warping work for the maintenance of the grinding plant reached. This can result in unnecessary costs and downtimes and impair the efficiency of the grinding plant.
- the technical problem on which the invention is based consists in specifying a method and a system for a plant for grinding and/or grinding, in particular grains, with which the grinding and/or grinding can be optimized and carried out automatically, and which improves operational reliability and increase the service life of such a grinding plant.
- a method and a system for monitoring wear on components of a grinding plant, in particular for monitoring wear on grinding rollers or a pair of grinding rollers in the grinding plant, according to the invention determines an optimized future point in time for maintenance of the grinding plant, in particular maintenance of a grinding roller or one pair of grinding rollers.
- the method is used in particular for the maintenance of the grinding plant over the life cycle of the plant.
- the method can also be referred to as a monitoring method or as a maintenance method.
- the method is carried out by means of a system that has a control unit for controlling the grinding system, in particular for controlling the grinding rollers or pairs of grinding rollers, a sensor system for recording measurement data on technical parameters with regard to a wear condition of a component, in particular a grinding roller or a pair of grinding rollers, and Collecting measurement data on technical Parameters relating to an operating state of the grinding plant, an analysis unit for analyzing wear behavior of the grinding plant and at least one data transmitter and at least one data receiver for exchanging data.
- a control unit for controlling the grinding system in particular for controlling the grinding rollers or pairs of grinding rollers
- a sensor system for recording measurement data on technical parameters with regard to a wear condition of a component, in particular a grinding roller or a pair of grinding rollers
- Collecting measurement data on technical Parameters relating to an operating state of the grinding plant an analysis unit for analyzing wear behavior of the grinding plant and at least one data transmitter and at least one data receiver for exchanging data.
- the sensor system records the measurement data on the state of wear of at least one component, in particular a grinding roller or a pair of grinding rollers, and the measurement data on the operating state of the grinding system periodically or continuously over time and provides the measurement data to the analysis unit, e.g. B. by means of a data transmitter.
- the sensor system can comprise several measuring sensors.
- the analysis unit assigns a degree of wear of the at least one component to the measurement data for at least one of the parameters relating to the state of wear of at least one component. Furthermore, the analysis unit assigns a maintenance loss to the degree of wear, which corresponds to a grinding yield loss due to technical maintenance of the at least one component.
- the loss of maintenance can B. be determined by a loss of grinding yield due to a standstill of the grinding plant and / or the cost of eliminating the wear and tear. The loss of maintenance can thus e.g. B. depend on the extent and duration of maintenance work and materials required to remedy wear and tear on the component.
- the analysis unit derives a future wear condition at a point in time T in the future from a plurality of measurement data on the wear condition recorded at different times.
- the analysis unit assigns a future degree of wear and a future loss of maintenance to the future state of wear.
- the future state of wear can be determined from the measurement data collected periodically or dynamically using standard extrapolation methods.
- the future degree of wear and the future loss of maintenance are correlated with the future state of wear and can thus be derived from it.
- the analysis unit can be provided in a digital cloud platform.
- the analysis unit can be used from several geographically separate locations for use in different grinding plants.
- the analysis unit can be easily updated and used multiple times.
- the analysis unit arranges the measurement data into at least one
- the analysis unit compares the grinding yield value with a predetermined yield target value of the grinding plant and determines a grinding yield loss relative to the yield target value.
- the target yield value can e.g. B. be given by a technical system specification of the system manufacturer or system operator.
- the target yield value can also be a theoretical ideal yield value for the grinding plant to be monitored, which is calculated from the technical characteristics of this plant, or the target yield value can be determined by a practical test run of the plant as long as there is no wear of plant components.
- Time is due to wear of the grinding components, especially grinding rollers, or pair of grinding rollers, as a rule below the specified yield target value for a grinding plant, which results in a loss of grinding yield.
- the yield from the grinding operation of the grinding plant is reduced by the fact that there is an increased energy requirement in the plant due to wear or additional passages are required to maintain a grinding quality.
- the analysis unit derives a future operating state from a number of measurement data on the operating state recorded at different times and from this a future loss of grinding yield at a point in time I rubbed in the future.
- the future operating status can be determined, for example, by extrapolation methods.
- the future grinding yield loss ⁇ correlates with the future and can therefore be determined from the measurement data of the operating status.
- the analysis unit optimizes a maintenance time in the future by determining as the future maintenance time ⁇ the time at which the future maintenance loss essentially corresponds to the future grinding yield loss. Dynamic optimization is advantageously carried out, with the analysis unit periodically or dynamically including current measurement data on a wear condition of a component and current measurement data on an operating condition of the grinding plant in the analysis of the wear behavior and an updated degree of wear, an updated maintenance loss and an updated grinding yield loss, and from this an up-to-date optimized future maintenance time is determined.
- the monitoring method according to the present invention uses the technical parameters to determine the state of the grinding plant and, depending on these technical parameters, determines precautions for the technical maintenance of the grinding plant. With the monitoring method, the technical functioning of a grinding plant can be optimized over the entire life cycle of the grinding plant.
- the analysis unit determines at least one specific maintenance work required for a specific wear from the measurement data on technical parameters relating to a wear condition of a component and/or from the measurement data on the operating condition of the grinding plant.
- the analysis unit defines a future maintenance time for this required specific maintenance work as the time when the specific future maintenance loss resulting from this specific wear corresponds to the specific future grinding yield loss resulting from this specific wear. Examples of specific maintenance work are replacing a roll shaft, a roll stub or a roll bearing or the entire roll, balancing the rolls and a Grinding and polishing of smooth rolls.
- the monitoring method can determine a future maintenance time for each such specific wear.
- the analysis unit aggregates measurement data of different parameters for the state of wear of at least one component and/or different parameters for the operating state of the grinding plant by means of an aggregation module.
- the analysis unit can assign an aggregated degree of wear and an associated aggregated loss of wear to the at least one component.
- the analysis unit can assign an aggregated grinding yield value loss to the operating state of the grinding plant. For example, measurement data relating to the temperature, the vibration and the rotational speed of a grinding roller, the gap distance between a pair of grinding rollers, the ambient humidity, etc. can flow into the aggregated degree of wear. Measurement data on the energy consumption of the grinding plant, the quantity and quality of the grinding yield, etc.
- a large number of measuring sensors of the sensor system can record measurement data on different parameters and transmit them to the analysis unit.
- the analysis unit aggregates the large number of measurement parameters to form an aggregated state of wear or an aggregated operating state.
- different parameters can also be weighted. For example, parameters that are characterized by wear or an aggregated operating state.
- Determination of a wear of a component have a higher relevance, have a higher weighting than parameters that are less relevant.
- Measurement data relating to different types of wear such as the specific types of wear mentioned above, and/or different components can advantageously also be taken into account and aggregated to form a common degree of wear of the component or of the entire grinding plant.
- a different weighting can in turn be assigned to the different types of wear and components.
- Monitoring system advantageously several measuring sensors that are distributed in or near the grinding plant. Measurement sensors are preferably used, the measurement data on a temperature of components, a roll profile and / or a roughness of grinding rollers of the grinding plant, a rotational speed of the grinding rollers, a vibration of the grinding rollers, a distance between rollers of a pair of grinding rollers, a
- the measuring sensors for determining the roll profile of corrugated rolls record in particular a contour of the corrugation, e.g. B. their angle, gradient, rounding, etc.. For burnished rollers, the surface structure in particular is recorded.
- the measuring sensors can also be designed as sensor units with several components.
- an optical sensor unit can be provided, which includes, among other things, a light emitter and a light receiver, such as a camera.
- At least one temperature sensor and one vibration sensor are arranged, for example, on a grinding roller of the grinding plant.
- the grinding roller can advantageously include at least one data transmitter and a microprocessor in order to provide measurement data about the grinding roller for the analysis unit. This provides a type of roll wear measuring device on the grinding roll.
- the analysis unit uses a regression module and/or an interpolation module to create a forecast of the future maintenance loss and the future grinding yield loss.
- the regression module uses the temperature, the surface condition and the vibration of a grinding roller as independent parameters to determine the behavior of the degree of wear and to calculate it for the future.
- the energy consumption, the degree of grinding of the material to be ground and its quantity can be used to determine the loss of grinding yield in order to determine a value for the future.
- proven statistical methods can be used to check the technical condition of the grinding plant and to determine the wear behavior.
- the analysis unit includes a module for machine learning and can automatically determine the future maintenance loss and the future grinding yield loss, in particular these values can be automatically optimized.
- machine learning module machine learning module for short, it is possible to self-adaptively optimize the future maintenance time.
- the machine learning module can be configured for various types of machine learning, such as supervised learning, unsupervised learning, semi-supervised learning, reinforcement learning, transductive learning, multi-task learning, and the like. With the help of the machine learning module, the analysis unit can continuously
- the module for machine learning can send a control signal to the control unit for controlling the operation of the grinding plant, with which the operation of the grinding plant corresponds to an advantageous or desired maintenance time is self-adaptively optimized in such a way that the future maintenance time corresponds to the advantageous maintenance time ⁇ .
- the life cycle of the grinding plant there may be different times for maintenance when the plant is used in practice.
- maintenance of the system can advantageously be planned if the grinding system is adapted to changed material to be ground or the system consists of other z. B. should not be stopped for technical reasons.
- Such an advantageous maintenance time can be before or after a future maintenance time ⁇ determined by the monitoring system.
- the machine-learning module can be used to determine optimized operation of the grinding plant. It can be advantageous to optimize the operation of the grinding plant by optimizing the parallelism of the grinding rollers in a pair of rollers, the distance between the grinding rollers and/or the rotational speed of the grinding rollers, based on the future maintenance loss determined by the machine learning module and the future maintenance losses loss of grinding yield. If, for example, an advantageous maintenance time is only slightly later than a future maintenance time determined by the analysis unit, the operation can be optimized such that the control unit sets a somewhat more gentle or energy-saving grinding operation or the like. This can e.g. This can be the case, for example, in the case of unforeseeable events that make a normal maintenance procedure impossible. Conversely, if the beneficial maintenance time ⁇ is earlier than a future maintenance time ⁇ determined by the analysis unit, then operation can be intensified, which can result in faster wear but which can be remedied at the earlier beneficial maintenance time ⁇ .
- Specification data of the grinding plant and/or of a material to be ground are processed from a data pool for optimizing the maintenance time in the future, for determining the future maintenance loss and the future grinding yield loss.
- the data pool can e.g. B. be made available by means of a cloud platform.
- the data pool advantageously provides data relating to a specific grinding plant, in particular data on the costs of material and labor during maintenance, energy costs for operating the grinding plant at the plant's location and/or information on the material to be ground, such as advantageous temperature ranges for grinding, the usual number of passes required , purchase price of the grist or selling price of the ground flour.
- This specification data can advantageously be continuously adapted to current values, so that current specification data can also be taken into account at future maintenance times.
- the data pool can provide measurement data on technical parameters relating to a wear condition of a component and/or an operating state of other, comparable grinding systems in order to optimize the determination of future maintenance loss and future grinding yield loss by comparing and/or including this measurement data.
- the machine learning module can learn from these other, comparable grinding systems and further improve the optimal maintenance time ⁇ in a self-adaptive manner.
- the monitoring system according to the invention is advantageously made up of units and/or modules that are at least partially made available in the cloud platform.
- the cloud platform can be used to store the measurement data.
- the cloud platform serves as a large central database and provides working units for executing the process, which can be used for different grinding plants at distributed locations. The configuration of the monitoring system on the individual grinding plants can therefore be simplified and made more economical.
- an output unit can visually indicate a degree of wear of at least one component and/or a loss of maintenance with regard to at least one component and/or a loss of grinding yield of the grinding plant as a time course.
- future values and the determined future maintenance time ⁇ are also displayed.
- An operator of the grinding plant can easily read the development of the plant wear from the display.
- the individual degrees of wear and loss values for various components, the projected values and also the aggregated values can be displayed.
- the output unit includes a visualized, tailor-made dashboard format that is designed in such a way that wear reports, recommended future maintenance times with forecasts, or recommendations for changing the rolls and information about the grinding operation and its optimization are automatically displayed.
- the operator can have the reports transferred to his personal company account, which improves process transparency.
- a manufacturer of grinding plants can provide service software in which the operator's individual data and data on his grinding plant can be managed.
- the operator uses this service software by setting up a company account on the software platform in order to make the data and information about the grinding plant easily and transparently accessible to an operator.
- the measurement data on technical parameters relating to a wear condition of a component and an operating condition of the grinding plant can be loaded into a cloud platform using the data transmitter and/or the data pool can be loaded with data relating to a specific grinding plant and/or data other, comparable grinding plants can be made available in a cloud platform.
- the decentralized storage, storage and processing serves to
- Monitoring procedure recommends a service module of the monitoring system based on the determined future maintenance loss and future Mill Yield Loss ⁇ automates a timeline of mill maintenance. Additionally or alternatively, the service module can automatically create an offer for maintenance of the components and/or an associated maintenance order. For example, a service module derives a required maintenance procedure from the determined state of wear. The procedure can include a timeline of individual maintenance activities and a listing of material that needs to be replaced. This can be used to automatically create an offer with a schedule and cost statement. An operator of the grinding plant can accept this offer, which means that the maintenance procedure can be activated automatically. For example, material can be ordered and maintenance specialists can be booked.
- an identification means is provided on at least one of the monitored components, in particular on a grinding roller.
- the means of identification has electronically stored data relating to the component.
- the component of the grinding plant can be clearly identified by means of the identification means.
- the identification means can provide individual data on the component and on at least one property of the roller, such as at least one of its dimensions, its crowning and/or a product number.
- the component can have at least one data memory, for example, which is designed as an RFID chip, for example.
- the data stored in the data memory can advantageously be transmitted to the analysis unit without contact using a data transmitter.
- the object of the present invention is also achieved by a grinding system with a grinding roller, in particular with corrugated or smooth rollers, which includes a system as described above.
- the grinding plant according to the invention is preferably for grinding wheat and/or rye and/or durum and/or oats and/or barley and/or peas and/or chickpeas and/or legumes and/or rapeseed and/or soya and/or cocoa and / or coffee designed as ground material.
- measurement parameters of the roll wear measurement device are uploaded to a digital cloud platform and the measured measurement parameters of the roll wear measurement device are automatically analyzed by the analysis unit of the digital platform.
- An operator can receive an automated display of the wear results as reports with roll change predictions and recommendations and details for process transparency and optimization and transmitted in the visualized, customized dashboard format on his personal company account.
- the analysis unit links the measurement results with the service module to create a corrugated and smooth roll refurbishment & exchange service and to automatically create an offer and a corresponding order for the refurbishment/exchange services corrugated and burnishing.
- a similar approach can be applied to other components, such as feed rolls, actuators, feeders, and the like.
- Fig. 1 a roller mill of a grinding plant according to the prior art, partly in
- Fig. 4a &. 4b graphical representation of an analysis by an analysis unit of a monitoring system according to the present invention
- Fig. 5a - 5d examples of wear on corrugated rolls
- Fig. 6a &. 6b wear analysis on surfaces of smooth rolls
- Fig. 7 Example measurement report for wear analysis from Fig. 6a & 6b,
- Fig. 8a & 8b Wear analysis on surfaces of corrugated rolls
- Fig. 9a Example measurement report for wear analysis from Fig. 8a & 8b
- Fig. 9b Example analysis report for wear analysis from Fig. 8a &. 8b
- Fig. 9c Example measurement report for wear analysis from Fig. 8a & 8b
- Fig. 10a & 10b schematic representation of a groove technology in corrugated rolls
- Fig. 1 1 Tabular overview of corrugation types for corrugating rolls
- Fig. 12 schematic representation of parameter values for corrugated rolls with
- Fig. 13 Interaction field for entering specification data
- Fig. 14 Graphical example of an analysis model for determining a future maintenance time. Detailed description of preferred variants
- FIG. 1 shows components of a roll mill of a grinding plant, partly in elevation and partly in section, as is known from the prior art.
- the material to be ground is fed to the crushing rollers a and b by means of the feed rollers c and d.
- the latter runs at the same peripheral speed as the crushing roller b, so that the material never accumulates on the rollers and thus the grinding surfaces are subjected to greater stress.
- a slider f can be adjusted by means of an adjusting screw e in such a way that the feed roller c only supplies as much material to the feed roller d as the latter can pass on to the shredding rollers a and b.
- the mills have recently been fitted with an aspiration device. Automatically pressing brushes, for example, can be used to clean the rollers.
- a method and a system for monitoring wear on components of a grinding plant and for maintaining the grinding plant according to the invention and variants thereof are explained in the figures by way of example and in extracts.
- Such a monitoring system is shown schematically as an overview in FIG.
- a grinding plant 1 for processing, or for grinding, a material to be ground 100 into a ground ground product 110 comprises at least one pair of grinding rollers 2, which correspond to the crushing rollers a and b from FIG.
- the grinding rollers 2 represent various components of the grinding plant, the wear and tear of which is monitored with the system according to the invention in order to simplify the explanation of the invention.
- the monitoring system also includes a control unit 3 for controlling the grinding plant, in particular the pair of rollers 2, which is advantageously arranged in the grinding plant. Furthermore, a sensor system 4 for acquiring measurement data on technical parameters relating to a state of wear of a component, in particular the Grinding rollers, and an operating state of the grinding plant provided.
- the sensor system 4 includes a large number of measurement sensors for acquiring measurement data on technical parameters with regard to a wear condition of a component and/or an operating condition of the grinding plant.
- the sensor system includes one or more temperature sensors 4.1 for measuring the temperature of the grinding rollers 2, their surroundings and/or the ground product 110, one or more vibration sensors 4.2 for measuring a vibration of the grinding rollers 2, one or more accelerometers 4.3, preferably at least one for one grinding roller 2 each, one or more moisture sensors 4.4 for detecting the humidity in the area surrounding the grinding rollers 2 and/or the product to be ground 110, an energy consumption sensor 4.5 for detecting an energy consumption of the grinding system 1, and sensors 4.6 for recording measurement data on the quality and quantity of the product to be ground 110 Furthermore, measuring sensors 4.7 for determining a surface quality or a surface state, a distance between the grinding rollers 2 and the parallelism of the grinding rollers 2 to one another and measuring sensors 4.8 for determining an identification means 5 of the grinding rollers 2 can be present.
- the measurement sensors 4.1 ... 4.8 of the sensor system 4 detect wear measurement data 40 on technical parameters relating to a state of wear of a component, in particular the grinding rollers 2 of the grinding plant 1, such as the nature of the roller surface, the roller spacing, the roller parallelism and the roller temperature. Furthermore, the measurement sensors 4.1 ... 4.8 of the sensor system 4 detect operating measurement data 50 on technical parameters of an operating state of the grinding plant 1, such as the energy consumption, the ambient temperature and humidity, the rotation or change in the rotation of the grinding rollers 2 and measurement data on quality ( e.g., granularity of the mill product) and quantity (such as a weight, or change in weight, of the mill product).
- quality e.g., granularity of the mill product
- quantity such as a weight, or change in weight, of the mill product.
- the sensor system records the measurement data 40 on the state of wear of at least one component and the measurement data 50 on the operating state of the grinding plant periodically or continuously over time, so that there is a measurement series extending over a defined period of time.
- the defined period can be e.g. B. extend from a first commissioning of the grinding plant or from a last maintenance or from other predetermined events of the grinding plant.
- An analysis unit 6 of the monitoring system analyzes a behavior of the grinding plant 1 with regard to wear of the components or a wear-related change in the operation of the grinding plant over time.
- the analysis unit 6 can be provided in a computing device, such as a computer, of the grinding plant 1 .
- the analysis unit 6 according to the invention is advantageous in one
- the analysis unit 6 can thus be part of a monitoring system for different grinding plants that are independent of one another. Furthermore, by using a cloud platform as a central point for the analysis unit 6, a high working capacity can be provided for the system and the computing device of the grinding plant can be designed with a lower working capacity.
- the measurement data 40 and 50 recorded by the sensor system 4 relating to technical parameters of the grinding plant 1 are made available to the analysis unit 6 by one or more data transmitters 8 that are present in the grinding plant 1, preferably without contact.
- the data transmitter 8 can advantageously on the components to be monitored or in their be provided in the immediate vicinity. For example, a data transmitter can be provided on one grinding roller, preferably on both grinding rollers 2 .
- Further data transmitters can be provided on a power supply of the grinding plant, in a storage room for the material to be ground 100 and/or a storage room for the ground product 110.
- the measuring sensors can be equipped with the data transmitters.
- the data can be transmitted to the analysis unit 6 or to the cloud platform 7 by means of a network connection.
- the measurement data are advantageously stored in a storage space in the cloud platform 7 and made available to the analysis unit 6 .
- the analysis unit 6 or the cloud platform 7 comprises at least one data receiver 9.
- the system for monitoring wear on components of a grinding plant according to the invention can include a data pool 10 .
- the data pool 10 is advantageously also provided in the cloud platform 7, but can also z. B. in the computer unit of the grinding plant 1.
- the data pool can provide additional data for an analysis of wear and future wear
- specification data 60 for grinding plant 1 can be stored in the data pool.
- the specification data 60 can include plant-specific data and threshold values for the grinding production, such as a yield target value, a temperature target value for the grinding rollers 2 and/or the material to be ground 100 or the material to be ground 110, a moisture target value for the material to be ground, target values for the surface finish , parallelism and the spacing of the grinding rollers 2, dimensions of the grinding rollers 2, information on the material to be ground 100, information regarding costs, availability and expected energy consumption of the components, information on the ground product 1 10, such as target temperature, target moisture and sales value.
- the specification data 60 can be continuously updated in the data pool 10 so that the analysis unit 6 can be supplied with current specification data 60 at any time.
- the analysis unit is configured with an analysis algorithm which uses the data available in the data room to determine a future course of wear, a future loss of maintenance and a future loss of grinding yield. From these projections, the analysis unit then determines an optimal future maintenance time. Essentially, statistical methods and/or experimental modeling methods can be used to analyze the data and preview trends, where confidence levels and probabilities associated with the parameters can be predefined ⁇ .
- the analysis unit 6 can also include a machine learning module 11, which automatically optimizes the determination of the future maintenance time.
- the machine learning module 11 accesses the data in the data room and applies machine learning methods, in particular methods based on pattern recognition, in order to analyze a wear profile to improve continuously. In doing so, the machine learning module 11 identifies relationships in patterns in an analyzed data set from the data space and applies these relationships to new data sets, such as data sets from other grinding plants or from other data acquisition windows. An algorithm based on monitored learning is advantageously used here. Of the
- the algorithm is trained with existing measurement data series and associated known wear characteristics and associated yield losses.
- the point in time of maintenance at which a total grinder frag loss is optimized is determined as the target variable.
- an algorithm based on unsupervised learning can also be used, in particular if only a small amount of comparative measurement data is available for a connection between wear and Mahler frag loss.
- the system for monitoring wear on components of a grinding plant can further comprise an output unit 12 which visually displays the results from the data analysis, in particular the course of wear and a determined future warping time, as a course over time.
- a progression beyond the maintenance time is also displayed in order to illustrate an expected wear profile and grinding yield loss if wear is not remedied, ie no maintenance is carried out.
- the output unit 12 can be provided on the grinding plant 1, such as on the computer unit.
- the output unit 12 can be embodied on a mobile device, such as a smartphone or a tablet, which communicates with the analysis unit via a network.
- the monitoring system can comprise a service module 13 which, preferably based on the analysis results, recommends a schedule for maintenance of the grinding plant ⁇ and/or automatically creates an offer for maintenance of the components and/or a maintenance order.
- the service module 13 can do this, for. B. fall back on specification data 60 from the data pool 10, such as the availability of replacement components, costs for the components, costs for work, etc.
- the offer can advantageously be displayed on the output unit 12.
- the service module 13 is advantageously provided in the cloud platform 10 and can be part of several monitoring systems that are provided for different grinding plants.
- FIG. 3 shows, by way of example, a sequence of the method for monitoring wear on components of a grinding plant, in particular on grinding rollers of the grinding plant, according to the invention.
- the individual steps of the course of the method can essentially take place in real time and continuously, or the method can be carried out at predetermined time intervals, with which the analysis results can be updated periodically. Alternatively, the procedure can also be carried out Manual activation can be triggered, for example if an update is desired.
- the sensor system 4 in a data acquisition step 200 the sensor system 4 first acquires the measurement data 40 on the state of wear of at least one component and the measurement data 50 on the operating state of the grinding plant periodically or continuously over time.
- the measurement data 40 and 50 are provided for the analysis unit 6 as described above.
- the specification data 60 for the analysis unit 5 can be provided in a further data collection document 210 .
- the specification data 60 can contain information on the production capacity, the production quantity, the energy costs, the prices for buying and selling the ground material and the ground product, and a desired yield value.
- the specification data may include information regarding specific maintenance activities, such as costs for refurbishing and replacing a grinding roll, transport costs, costs due to a production loss, and labor costs.
- the specification data 60 can, for example, be retrieved from the data pool 10, stored in the computer unit of the grinding installation or made available in some other way.
- the analysis unit 6 assigns the measurement data 40 to at least one parameter relating to the state of wear of at least one component, a degree of wear and the degree of wear a value for a maintenance loss 300 (see Figure 4), which corresponds to a loss of yield due to technical maintenance of the at least one component . Furthermore, the analysis unit derives a future state of wear at a point in time in the future from a plurality of measurement data 40 recorded at different times on the state of wear and assigns a future degree of wear and a future loss of maintenance 310 to the future state of wear. At the same time, the analysis unit assigns the measurement data 50 to at least one
- the analysis unit 6 derives a future operating state and from this a future grinding yield loss 340 from a plurality of measurement data 50 on the operating state recorded at different times
- the analysis unit 6 determines an optimized forwarding time in the future TW by specifying as the future forwarding time TW that point in time at which the future maintenance loss 310 corresponds to the future grinding yield loss 340 .
- the individual analysis values 300, 310, 320 and 340 as well as the future maintenance time TW can be determined by the analysis unit 6 using statistical methods and/or empirical model methods, as explained above.
- the analysis unit 6 can create a forecast of the future maintenance loss and the future grinding yield loss by means of a statistics module 14 of the monitoring system, such as a regression and/or interpolation module.
- the statistics module 14 can be provided in the analysis unit 6 and/or the cloud platform 7 .
- the statistics module 14 can be part of the machine learning module 11 .
- the machine learning module 11 can further improve the analysis of the data and the determination of the future maintenance time TW based on machine learning methods as mentioned before.
- To Determination of the analysis results are made available to the operator of the grinding plant 1 in an analysis report by means of the output unit 12, such as B. is explained in more detail in Figures 7 and 9a to 9c.
- a maintenance plan for the maintenance of the grinding plant 1 can be proposed to the operator by means of the service module 13 and the output unit 12 .
- the analysis unit can advantageously transmit at least the current degree of wear and the current grinding yield value to the control unit for the automated control of the grinding plant.
- the predicted values are preferably also sent to the control unit in order to optimize the control of the grinding plant.
- the further procedure for servicing and maintaining the grinding plant 1 is described in FIG.
- the maintenance plan is implemented according to the offer from the service module 13.
- the operational data and specification data are updated if necessary. For example, the time of the last maintenance of the affected components and their identification feature are stored and an updated target yield value can be recorded.
- the maintenance work can be billed, for example by means of the analysis unit 6.
- a comparative value can also be determined and specified, for example, which indicates a loss amount that was avoided by having the grinding plant serviced at the determined optimized maintenance time ⁇ instead of at an earlier or later point in time. The loss amount thus corresponds to an amount that was saved by carrying out maintenance at the optimized maintenance time.
- FIG. 4a shows a graphical representation of the results from an analysis of the analysis unit 6 according to the monitoring method according to the present invention.
- the graph gives units for a progression over time, or a unit of measurement for a lost grinding yield and a loss due to increased energy consumption caused by wear of the grinding components.
- the graph indicates cost units for these units of measurement, or costs over time. The graph is normalized in such a way that there are no costs, no lost grinding yield and no loss due to increased energy consumption, provided that the
- Grinding plant produces a yield that corresponds to the yield setpoint for the plant.
- An energy loss curve 300 and a yield loss curve 310 therefore start at the zero point of the graph.
- the degree of wear on the components of the grinding plant increases and the grinding yield during operation of the grinding plant decreases. This means that the value of the lost milling yield and the loss due to increased energy consumption increase.
- the analysis unit determined a linear increase in the lost grinding yield and the loss due to increased energy consumption over time.
- the course of yield loss due to maintenance of the grinding plant over time, or the age of the grinding plant is displayed as a maintenance loss curve 320 in the graph.
- the analysis unit has determined an exponential drop in curve 320 .
- the grinder loss values curves 300, 310 and 300 are only determined by measurement data for a historical period. For a period in the future, the curves are determined by the analysis unit on the basis of measurement data, possibly specification data and possibly additional information that is available. At a current time TA, a maintenance time TW can thus be optimally defined in the future by determining the point in time at which the future maintenance loss, represented by curve 320, corresponds to the future grinding yield loss, represented by curve 310. It is noted that instead of separate curves for the energy loss curve 300 and the
- Yield loss curve 310 a grinding yield loss curve can be determined, which is based on the aggregated data on these curves.
- the aggregate grinder frag loss curve thus reflects the combined value of all factors that reduce the grinder yield due to wear.
- Figure 4b is a graphical representation of the results from an analysis of the
- An aggregated grinding yield loss curve 410 was determined here, which specifies the loss of grinding yield ⁇ caused by lost profit and increased energy costs caused by aging and wear and tear of the system components. The curve does not start at the origin of the graph, as there is already a loss in milling yield at this point.
- a maintenance loss is indicated by maintenance loss curve 420 . As in the previous example, maintenance loss decreases exponentially over time.
- An optimized maintenance time in the future is determined by the intersection of the graphs 410 and 420 at which the future maintenance loss corresponds to the future milling yield loss. The history of total loss is given by graph 460 for which the mill yield loss and maintenance loss are added.
- a current point in time TA is usually in the range 430 of preventive maintenance, but at which there is a higher loss of yield when the grinding plant is at a standstill ⁇ than can be compensated for by the maintenance.
- a future maintenance optimal time ⁇ TW is within the predicted optimized maintenance period 440 where the curves 410 and 420 are converging where the apex of the total loss curve 460 is.
- the total loss curve 460 runs at least approximately horizontally around this apex, so that the total loss costs differ only slightly in this area at different times.
- the predicted optimized maintenance period 440 could e.g. B.
- a method and system according to the present invention are suitable for measuring the wear condition of grain processing rolls, including corrugated and smooth rolls for respective grist, using a roll wear measuring device. Measuring parameters of the roll wear measuring device are advantageously uploaded to a digital cloud platform and the measured measuring parameters of the roll wear measuring device are automatically analyzed by the analysis unit of the digital platform.
- a user receives an automated display of wear results and reports with roll change predictions and recommendations and additional process transparency/optimization in a visualized, customized dashboard format transferred to their personal corporate account, which an equipment manufacturer can provide as a service to them.
- yield losses are caused in particular by wear and tear on the components of the grinding plant, which leads to a drop in throughput.
- FIG. 5a to 5d different examples of surface textures are shown in corrugated rolls, which have different wear defects.
- the graph 900 shows a current corrugated contour and the graph 910 shows an ideal line of this corrugated roller for comparison.
- the increased energy consumption leads to heating of the grinding components and their surroundings, as a result of which the humidity in the surroundings and in the grinding product is reduced.
- wear and tear leads to reduced product quality and quantity. It is therefore crucial to find the right time for maintenance or replacement of the components, especially the grinding rollers, in order to maintain high product quality and optimize operating costs.
- a surface temperature of a lateral surface of at least one roll of the grinding plant and/or the temperature of a milled product can be measured with at least two temperature sensors which measure the temperature at different points on the at least one roll or a product curtain.
- a monitoring method according to the invention it is possible to detect and monitor the temperature where it is generated, namely on the surface of the rolls.
- the temperature of a milled product is monitored directly to monitor the roll temperature, since the roll transfers heat to the milled product and by measuring the temperature of the milled product it is possible to draw conclusions about the temperature of the milled rolls.
- a monitoring device for automated optimization of a control of a grinding plant is set up, as is shown in the applicant's patent specification EP 3500370 B1.
- the control of the grinding system in particular its grinding rollers, is automatically optimized over the service life by evaluating measurement data on components of the grinding system using a machine-learning unit.
- the monitoring device does not determine an optimized maintenance time ⁇ based on wear measurement data, operating measurement data, specification data and possibly additional information, as proposed by the present invention.
- FIG. 2 describes the detection of a corrugated type of a corrugated roller by means of measured values on the roller, with the surface structure of the roller being indicated both on the x-axis and on the y-axis.
- FIG. 2 describes the detection of a corrugated type of a corrugated roller by means of measured values on the roller, with the surface structure of the roller being indicated both on the x-axis and on the y-axis.
- FIGS. 5a and 5b show two possible variants of the integration of sensors in one or both rollers of the pair of rollers of the grinding plant.
- the acceleration measurement is carried out using an accelerometer.
- FIG. 6 shows an exemplary embodiment for arranging measuring sensors on a grinding plant.
- a measuring sensor z. B a wear sensor, a pressure sensor, a temperature sensor, a vibration sensor, an acceleration sensor / accelerometer, a force sensor or a deformation sensor, etc. are used.
- FIG. 7 describes the arrangement of measuring sensors.
- FIGS. 8 and 9 explain the integration of measurement sensors. In a variant of the monitoring method according to the present
- the surface finish of smooth rolls 2.1 is checked continuously or periodically.
- the measurement data from the measurement sensors can be used to monitor the course of the roughness of the surface over time.
- the surface roughness is shown over the length of the roll.
- the nature of the surface can be detected, for example, by means of optical measurement sensors.
- the roughness of the surface is determined using a scanning measurement sensor that includes a sensitive diamond tip that scans the surface.
- the analysis unit determines the surface profile from the scanning measurement data and uses it to determine a state of wear or degree of wear of the smooth roller. This is done, for example, by comparing it with a theoretical or ideal reference surface profile, or by comparing different measurements over time.
- the analysis unit assigns a maintenance loss to the degree of wear, provided that maintenance would be carried out at this degree of wear.
- the throwing loss can e.g. B. can be determined from the current measurement data on the quality and quantity of the ground product at the time of the observed degree of wear.
- the maintenance loss can also be determined using a reference value for the grinding yield. From the course of the degree of wear or the loss of maintenance, the analysis unit determines a future degree of wear and assigns a future loss of maintenance. Next determines the
- Analysis unit optimizes a maintenance time ⁇ TW in the future by defining the future maintenance time ⁇ TW as the time at which the future maintenance loss due to wear of the surface of the smooth roll corresponds to the future grinding yield loss, as shown in Figures 4a and 4b.
- An example of a measurement report is shown in FIG. 4
- Output unit for the measurement data from Figure 6b can be displayed.
- an operator receives information on the measurement method, such as measurement location, measurement range and roll identification, as well as information on an average roughness value according to the DIN EN ISO 4287 standard and a roughness classification, such as "okay", “monitor” or "critical".
- the surface condition of corrugated rollers 2.2 is checked continuously or periodically.
- the measurement data from the measurement sensors can be used to monitor the current course of wear on the corrugations.
- FIG. 8b shows a surface contour of the corrugation determined from the measurement data.
- the course of wear of this contour is monitored over time and a wear course for the future is generated from this.
- the analysis unit determines a state of wear of the corrugated roll from the measurement data for the surface contour and assigns a degree of wear and a loss of maintenance to this.
- a future state of wear is derived from several measurement data recorded at different times and an associated future degree of wear and future loss of maintenance is assigned ⁇ .
- the analysis unit determines from measurement data operating state of the grinding plant a grinding yield value, which indicates the yield from the operation of the grinding plant, and from this determines a grinding yield loss relative to a desired yield value for this grinding plant.
- a future operating status and from this a future grinding yield loss in the future ⁇ are derived from several measurement data on the operating status recorded at different times.
- the analysis unit determines a maintenance time in the future in an optimized manner by determining the future maintenance time at which the future maintenance loss due to wear of the corrugated roller corresponds to the future grinding yield loss.
- FIG. 9a shows an example of a measurement report as it can be displayed by the output unit for the corrugated roller from FIG. 8b.
- the graph 900 of the measured corrugation contour is shown in a defined measurement area.
- an operator receives information on the current values of the corrugation contour, on target values and on the usual tolerance values.
- a categorization of a wear condition of corrugated edges, the overall roll, and the roll stub can be specified, such as "sharp", “dull", and “critical”.
- angles characterizing the corrugations can be specified, as will be described further below.
- FIG. 9b shows an analysis report ⁇ as is available for the corrugated roller from FIG. 8b.
- the graph of the corrugation contour 900 is again shown therein according to the measurement data, as shown in FIG. 9a.
- a theoretical ideal line 910 for the corrugation contour is also shown as a comparison. Additional characteristics of the current corrugation contour are also given, such as a
- Prognosis report shown for this corrugating roller The forecast report gives the analysis graph, as explained in FIG. 4a, for the wear on this corrugated roll.
- the forecast report gives values for loss of yield, loss due to increased energy consumption, current maintenance costs, a degree of wear, an expected lifetime and a time until the next recommended maintenance of the corrugated roll.
- the service life is still 15.25 months.
- Roller maintenance is recommended in 11 months.
- FIGS. 10a and 10b show examples of corrugated contours to explain the characteristics of corrugated rolls.
- the corrugations of a corrugating roll are described with reference to FIG. 10a.
- Corrugations of corrugating rolls have the following surfaces: a
- Squish surface 500 which is also described as land, a free surface or back surface 510, which leads to a base surface 520 behind a corrugation, and a cutting surface 530, which forms a cutting edge 540 with the squish surface 500.
- the preferred direction of rotation when using the corrugated roller is indicated in outline with arrow 550 .
- Shallow corrugated contours (on the left in FIG. 10b) are used for small grist and deep corrugated contours (on the right in FIG. 10b) for coarser grist.
- the height or the depth of the corrugation extends from the base area 520 to the squeezing area 500.
- FIG Corrugated rollers are used.
- the various embodiments differ primarily in terms of the angle which the cutting surface and the free surface assume to a normal to the roll surface.
- Different designs of corrugating rollers are used for different regrind and for different quality requirements.
- a grinding plant is equipped with suitable corrugated rollers according to its use.
- FIG. 12 shows a schematic representation of the characteristics of a corrugated roll with wear.
- the graph 900 again shows the currently measured surface contour and the graph 910 shows an ideal line, as explained in FIGS. 10a and 10b.
- distances between adjacent corrugations are defined: TI corresponds to a distance from the base to an edge of the squish area 500 opposite the cutting edge 540, T2 corresponds to a distance from the base to the cutting edge 540, L corresponds to the length of the squish area and T corresponds to a distance of one Cutting edge 540 to the nearest cutting edge of an adjacent corrugation.
- corrugations are described with characteristic heights: Hb corresponds to a height from the bottom to the crushed surface and Ha corresponds to a height from the bottom to the highest point of a measured crushed surface.
- different rounding radii describe the wear of a contour shape: r2 describes a radius at the base and r3 a radius at the pinch point.
- An angle a indicates the angle between a flank and the normal and an angle b indicates the angle between a cutting surface and the normal.
- Angles a and b are used to designate corrugation styles as listed in Figure 11. All of the characteristics mentioned can be detected by the sensors of the monitoring system according to the invention and used to determine the degree of wear of the corrugated roller, as described above.
- the analysis unit uses a mathematical model for different types of wheat, for example, which was developed on the basis of real tests with statistical test planning on a Laboi roller mill.
- the model uses roll wear as a percentage of cross-sectional area of the corrugations as variable A, mass flow in kilograms per hour as variable B, and percentage shedding on a 1120 micrometer screen as variable C.
- the tests resulted in a model for calculating the specific grinding energy according to the following formula:
- FIG. 13 now shows an analysis report for a corrugated roll that was created using the monitoring method according to the invention.
- certain characteristics of the corrugating roll can be entered manually, such as the orientation of the corrugations, a type specification and dimensions of the squish area of the ripple type.
- the orientation is used by the analysis unit to fit the measured corrugation contour into the ideal contour.
- the type specification can e.g. B. for the determination of reference angles or target angles of the corrugated contour.
- the dimensions of the crushing area can also serve as a reference value.
- the reference values can be used to determine threshold values for the analysis by the analysis unit.
- the monitoring method determines the degree of wear, the maintenance loss, the grinding yield loss and an optimized future maintenance time, as described above. For example, specification data for different types of wheat are used.
- specification data for different types of wheat are used.
- FIG. 14 shows an example of a prognosis report for the corrugated roller described in the analysis report from FIG.
- the prognosis here refers to that
- Energy saving potential as described above, and is illustrated by a three-dimensional graph that plots variables from the formula for specific grinding energy.
- the forecast report also states the energy costs with and without wear of the corrugated rolls. This calculation can then be used to determine the optimal future maintenance time according to the monitoring method of the invention.
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Abstract
Description
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CH2972021 | 2021-03-19 | ||
PCT/EP2022/057345 WO2022195127A1 (de) | 2021-03-19 | 2022-03-21 | System und verfahren zum überwachen eines verschleiss an komponenten einer mahlanlage |
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