EP3782732A1 - Roller with a sensor - Google Patents

Abstract

The present invention relates to a grinding roller (1) for use in a pair of grinding rollers, in particular a pair of grain rollers, comprising at least one sensor (2) for detecting measured values that characterize a state of the grinding roller, the sensor (2) in a receiving opening (1a) the grinding roller (1) is arranged, at least one data transmitter (3) for contactless transmission of the measured values of the at least one sensor (2) to a data receiver, the sensor (2) by means of a cap (4) made of ceramic material in the receiving opening (1a) is included. The present invention further relates to a corresponding pair of grinding rollers, a production system comprising such a pair of grinding rollers, a corresponding cap (4), a kit consisting of a corresponding cap (4) and a fastening device (5), and a method for operating such a product processing system.

Description

The present invention relates to a sensor for a roller of a roller pair, in particular a grinding roller pair such as a grain roller pair, the sensor being integrated into the roller and having an improved cover cap.

Grinding rollers such as those used in grain milling, for example, require constant monitoring. For example, it can happen that a so-called dry run occurs, in which neighboring grinding rollers touch each other and the drive power of the motor is converted into heat in an uncontrolled manner. If this condition lasts too long, the temperature of the grinding roller can rise to a critical level and possibly cause a fire.

A common precautionary measure in the prior art is to monitor the temperature of a grinding roller with the aid of one or more sensors and to issue a warning when an ignitable temperature is reached. Optical systems are often used for this purpose to detect the circumferential surface of the grinding roller. The problem with this, however, is that these optical systems are located outside the grinding rollers in the product space through which the ground material also flows. For this reason, optical systems of this type are extremely susceptible to contamination.

From the DE 102 26 411 A1 it is known to measure the temperature of the circumferential surface of a grinding roller without contact with the aid of temperature sensors. Due to the distance between the sensor and the circumferential surface of the grinding roller, the actual temperature of the circumferential surface can sometimes differ considerably from the measured temperature. These deviations must then be based on pure Empirical values are taken into account in the evaluation, which is cumbersome and also prone to errors.

Also the DE 198 19 614 A1 discloses temperature sensors spaced from the grinding rollers.

Furthermore, pressure sensors or sensors for measuring the surface properties of a grinding roller are known, with the aid of which the contact pressure between two adjacent grinding rollers or the wear of a grinding roller can be measured. Furthermore, for example, from the WO 2007/025395 A1 Known vibration sensors for grinding rollers.

All these sensors are also arranged outside the grinding rollers.

To eliminate the disadvantages associated with an arrangement of sensors outside of the grinding rollers, was in WO 2014/195 309 A1 proposed to integrate the sensor or sensors in a grinding roller.

It was the object of the present invention to overcome the disadvantages of the prior art described above.

The above object is achieved according to the invention by the subject matter of the independent claims.

• mindestens einen Sensor zur Erfassung von Messwerten, die einen Zustand der Mahlwalze charakterisieren, wobei der Sensor in einer Aufnahmeöffnung der Mahlwalze angeordnet ist,
• mindestens einen Datensender zur berührungslosen Übertragung der Messwerte des mindestens einen Sensors an einen Datenempfänger,

dadurch gekennzeichnet, dass der Sensor mittels einer Kappe aus Keramikmaterial in der Aufnahmeöffnung eingeschlossen ist.In detail, the present invention relates to a grinding roller for use in a grinding roller pair, in particular comprising a grain roller pair

• at least one sensor for recording measured values that characterize a state of the grinding roller, the sensor being arranged in a receiving opening of the grinding roller,
• at least one data transmitter for contactless transmission of the measured values of the at least one sensor to a data receiver,

characterized in that the sensor is enclosed in the receiving opening by means of a cap made of ceramic material.

The present invention further relates to a pair of grinding rollers, in particular a pair of grain rollers, comprising at least one grinding roller according to the invention.

The present invention further relates to a product processing plant, in particular a grain mill, containing at least one pair of grinding rollers according to the invention. Alternatively, it can also be a material bed mill in the milling industry, a flaking mill, e.g. for oil production from oilseeds or for flaking grain, or a shot-rolling mill, e.g. in the oilseed oil or feed industry, whose rollers are also within the meaning of the present invention as "grinding rollers" or "grinding roller pairs" are to be understood.

The present invention further relates to a method for operating a product processing system according to the invention, comprising the step of detecting the state of a grinding roller according to the invention by means of the sensor arranged in the grinding roller.

The present invention further relates to a sensor cap made of ceramic material that is configured or adapted for use as a cap for enclosing a sensor in a receiving opening of a grinding roller, as well as a kit consisting of a sensor cap described here and a fastening device, this fastening device preferably consisting of a Ring is made of a metallic material.

For the purposes of the present invention, "processing a product" means grinding, comminuting and / or flaking Bulk goods, in particular grain, grain milling products and grain end products from milling or special milling understood as stated above, for which, for example, the pairs of grinding rollers or flaking rollers described in more detail below can be used as roller pairs.

Grinding rollers in the context of the present invention are designed to grind granular material to be ground, which is usually guided between a pair of grinding rollers made up of two grinding rollers. Grinding rollers, in particular the grinding rollers of the pairs of grinding rollers according to the invention, usually have an essentially inelastic surface (in particular on their peripheral surface), which for this purpose can contain or consist of metal, such as steel, in particular stainless steel. There is usually a relatively fixed and often hydraulically controlled grinding gap between the grinding rollers of the grinding roller pair. In many grinding plants, the material to be ground is guided essentially vertically downwards through such a grinding gap. In addition, in many grinding systems, the ground material is fed to the grinding rollers of a pair of grinding rollers by means of its gravity, and this feed can optionally be supported pneumatically. The grist is usually granular and moves as a fluid stream through the grinding gap. These properties distinguish a grinding roller (in particular a grinding roller of a pair of grinding rollers according to the invention) and a grinding system containing at least one such grinding roller, for example, from many rollers which are usually used for transporting paper.

According to the present invention, regrind is usually understood to be powder, granulate or pellet-shaped product which is used in the processing of grain, grain milling products and grain end products from milling (in particular grinding of soft wheat, durum, rye, maize and / or barley) or special milling (especially peeling and / or grinding of soy, buckwheat, barley, spelled, millet / sorghum, pseudocereals and / or pulses), the production of feed for farm animals and pets, fish and crustaceans, the processing of oilseeds, the processing of biomass and production of energy pellets, industrial malting and milling plants; the processing of cocoa beans, nuts and coffee beans, the production of fertilizers, in the pharmaceutical industry or in solid chemistry.

At least one roller, in particular both rollers of the grinding roller pair, in particular at least one grinding roller, in particular both grinding rollers of the grinding roller pair, can for example be designed as a smooth roller or as a corrugated roller or as a basic roller body with screwed-on plates. Smooth rollers can be cylindrical or cambered. Corrugating rollers can have various corrugation geometries, such as roof-shaped or trapezoidal corrugation geometries, and / or have segments placed on the circumferential surface.

At least one roller, in particular both rollers of the grinding roller pair, in particular at least one grinding roller, in particular both grinding rollers of the grinding roller pair, can have a length in the range from 100 mm to 2500 mm and a diameter in the range from 200 mm to 800 mm.

The circumferential surface of the roller, in particular the grinding roller, is preferably inextricably connected to the roller body and, in particular, is formed in one piece with it. This allows simple production and reliable and robust processing, in particular grinding, of the product.

The at least one sensor is designed to record measured values which characterize a state of at least one of the rollers, in particular both rollers of the roller pair. In particular this can be a state of a circumferential surface of at least one of the rollers, in particular of both rollers of the roller pair. The state can, for example, be a temperature, a pressure, a force (force component (s) in one or more directions), wear, a vibration, a deformation (expansion and / or deflection path), a rotational speed, a rotational acceleration, an ambient humidity, a Position or an orientation of at least one of the rollers, in particular both rollers of the roller pair.

At least one roller of the roller pair, in particular at least one grinding roller of the grinding roller pair, contains at least one sensor. If the roller rotates during operation, the sensor also rotates. In particular, the at least one sensor is arranged within a bottom surface of the roller. The at least one sensor is therefore not located in the product space through which the product, in particular the ground material, also flows. A product processing system with at least one such roller, in particular a grinding system with at least one such grinding roller, is therefore significantly less susceptible to contamination. In addition, the measurement can take place directly in the roller, which makes the measurement much more precise.

The sensor can be designed, for example, as a MEMS sensor (MEMS: Micro-Electro-Mechanical System).

The sensor is preferably in data connection with at least one data transmitter, the data transmitter being designed for contactless transmission of the measured values of the at least one sensor to a data receiver. According to the invention, the data transmitter is preferably arranged on or in the same roller as the sensor that is in data connection therewith. The data transmitter particularly preferably contains an antenna.

With the aid of the at least one data transmitter, the measured values can be transmitted without contact to a data receiver that is not part of the roller. In particular, it can be a stationary data receiver, with respect to which the at least one sensor is moved when the roller rotates. The contactless transmission means that complex rotary feedthroughs for cables, which would otherwise be necessary, can be avoided.

Advantageously, at least one roller, in particular both rollers, contains a plurality of the sensors described above, in particular at least two, preferably at least four, more preferably at least six sensors, which are contained in the roller. More preferably, several sensors are in data connection with the at least one data transmitter. The sensors can be arranged at different positions along an axis of rotation of the roller and / or at different angles around this axis of rotation. The more sensors the roller contains and the more evenly they are distributed, the more meaningful the measured values they record. The sensors are preferably arranged uniformly in the circumferential direction, which creates a rotational equilibrium.

• Temperatursensor, wobei bevorzugt mehrere Temperatursensoren vorhanden sind, welche entlang einer Rotationsachse der Walze angeordnet sind, um ein Temperaturprofil entlang diese Richtung ermitteln zu können;
• Drucksensor;
• Kraftsensor (zur Bestimmung der Kraftkomponente(n) in einer oder mehreren Richtungen);
• Verschleisssensor;
• Vibrationssensor, insbesondere zum Ermitteln eines Wickelns, also einer Anhaftung des verarbeiteten Produktes an der Umfangsfläche der Walze, was Verarbeiten, insbesondere Vermahlen, an dieser Position behindert;
• Deformationssensor (zur Bestimmung einer Ausdehnung und/oder eines Auslenkwegs);
• Drehgeschwindigkeitssensor, insbesondere zum Ermitteln eines Stillstandes der Walze;
• Drehbeschleunigungssensor;
• Sensor zum Ermitteln einer Umgebungsfeuchtigkeit, der bevorzugt an einer Stirnseite der Walze angeordnet ist;
• gyroskopischer Sensor zum Ermitteln der Position und/oder der Orientierung der Walze, insbesondere zum Ermitteln der von der Position und/oder der Orientierung abhängigen Breite eines Spaltes zwischen den beiden Walzen der Walzenpaarung sowie der Parallelität der Walzen;
• Sensor zum Ermitteln der Breite eines Spaltes zwischen den beiden Walzen der Walzenpaarung, insbesondere eines Mahlspaltes zwischen den beiden Mahlwalzen der Mahlwalzenpaarung, beispielsweise ein in einer Stirnseite der Walze angeordneter Sensors, insbesondere ein MEMS-Sensor.

At least one sensor can be designed as

• Temperature sensor, wherein there are preferably a plurality of temperature sensors which are arranged along an axis of rotation of the roller in order to be able to determine a temperature profile along this direction;
• Pressure sensor;
• Force sensor (to determine the force component (s) in one or more directions);
• Wear sensor;
• Vibration sensor, in particular for determining lapping, that is to say adhesion of the processed product to the circumferential surface of the roller, which hinders processing, in particular grinding, at this position;
• Deformation sensor (for determining an expansion and / or a deflection path);
• Rotation speed sensor, in particular for determining a standstill of the roller;
• Rotational acceleration sensor;
• Sensor for determining an ambient humidity, which is preferably arranged on an end face of the roller;
• Gyroscopic sensor for determining the position and / or the orientation of the roller, in particular for determining the position and / or orientation-dependent width of a gap between the two rollers of the roller pair and the parallelism of the rollers;
• Sensor for determining the width of a gap between the two rollers of the roller pairing, in particular a grinding gap between the two grinding rollers of the grinding roller pair, for example a sensor, in particular a MEMS sensor, arranged in one end of the roller.

According to the invention, any combinations of the sensors described above are possible. For example, the roller can contain several temperature sensors and deformation sensors. According to a further embodiment, all existing sensors can be of the same type, that is to say designed as temperature sensors, for example. According to a further embodiment, at least one roller, in particular both rollers, can contain sensors of different types.

If one or both rollers contain or contain both several sensors and at least one data transmitter, it is preferred if the at least one data transmitter is designed for contactless transmission of the measured values from several of the sensors, more preferably from all sensors, to a data receiver. At least one roller, in particular both rollers, preferably contains at most only one, particularly preferably exactly one, data transmitter for the contactless transmission of the measured values. The fewer data transmitters the roller contains, the simpler the structure of this roller is.

In particular, if at least one roller contains only a single data transmitter, this roller, in particular both rollers, preferably contains at least one multiplexer, which is arranged and designed for the alternating transmission of the measured values recorded by the sensors to the data transmitter.

The contactless transmission can take place, for example, by infrared radiation, by light pulses, by radio frequency signals, by inductive coupling or a combination thereof.

The contactless transmission of the measured values here and in the following always also includes the transmission of data which are obtained through appropriate processing of the measured values and which are therefore based on the measured values. For example, at least one roller, in particular both rollers, can contain at least one signal converter, in particular at least one A / D converter, for converting the measured values recorded by the at least one sensor. In a first possible variant, at least one signal converter can be assigned to each sensor, which converts the measured values detected by this sensor. The converted signals can then be fed to a multiplexer as described above. If the signal converter is an A / D converter, the multiplexer can switch on be a digital multiplexer. In a second possible variant, the signal converter can also be arranged between a multiplexer as described above and the data transmitter. In this case the multiplexer can be an analog multiplexer.

At least one roller, in particular both rollers, in particular a roller body described further below, preferably contains at least one roller, in particular both rollers, at least one energy receiver and / or at least one energy generator. In this way, an energy supply of the at least one sensor and / or at least one multiplexer (in particular at least one multiplexer as described above) and / or at least one signal converter (in particular at least one signal converter as described above) and / or the at least one data transmitter (in particular the at or data transmitter contained in the roller) and / or at least one data transmitter of a measuring device described below can be achieved.

In particular, it can contain or contain, in particular, a rechargeable battery, with the aid of which the aforementioned energy supply can be achieved. Conventional and rechargeable batteries (accumulators) are known.

Alternatively, it can be an inductive energy receiver. In this variant, the energy receiver can for example have at least one receiving coil, with the aid of which electromagnetic energy can be inductively coupled. Alternatively or in addition, the energy receiver can also be designed to receive light energy. In a further variant, the energy generator can be designed to generate energy from the movement of the roller (in particular using thermoelectric effects such as the Seebeck effect, Peltier effect or Thomson effect, for example with the help of a thermocouple; or using vibrations or movements of the roller, for example with the aid of at least one piezo element).

Advantageously, at least one roller, in particular both rollers, contains at least one circuit board (in particular a MEMS circuit board) on which the at least one sensor and / or at least one multiplexer (in particular at least one multiplexer as described above) and / or at least one signal converter (in particular at least one signal converter as described above) and / or the at least one data transmitter (in particular the data transmitter contained on or in the roller) and / or at least one energy receiver (in particular at least one energy receiver as described above) and / or at least one energy generator (in particular at least one as described above energy generator) are arranged. The circuit board can contain measuring lines via which the sensors are connected to the multiplexer. Such a circuit board has the advantage that the components mentioned can be arranged very compactly on it and that the circuit board can be manufactured as a separate assembly and, at least in some exemplary embodiments, can be replaced again if necessary.

As an alternative to a circuit board, the sensors can also be connected to the data transmitter and / or the multiplexer via a cable harness.

According to the invention, at least one roller, in particular both rollers, comprises a roller body with at least one receiving opening, into which the sensor can, in particular, be detachably inserted or inserted.

In another embodiment, however, it can also be useful if the sensor is permanently inserted in the receiving opening. In this way, the sensor can be more secure with the roller body get connected. In addition, unauthorized removal of the sensor can be prevented, which could impair security. The sensor can for example be cast (for example with the aid of a resin) or welded into the receiving opening. This also avoids the risk of explosions, so that the ATEX guidelines of the European Union in particular can be met.

According to the invention, the receiving opening is preferably formed by a cylindrical bore which has a diameter in the range from 5 mm to 40 mm, preferably from 5 mm to 25 mm, particularly preferably from 10 mm to 20 mm, in the opening area of the bore preferably a range of 10 to 50 mm, preferably 20 to 40 mm, with a slightly larger diameter and particularly preferably a thread for firmly receiving the cap made of ceramic material described below.

This bore preferably extends parallel to an axis of rotation of the roller body. In order to be able to determine the state of a circumferential surface, the receiving opening is preferably arranged in an outer region of the roller body. For example, the receiving opening can be located in a cylinder-ring-shaped area of the roller body.

According to the invention, the receiving opening extends essentially along the length of the roller body parallel to the axis of rotation, for example along at least 10%, preferably at least 20%, particularly preferably between 50% and 100% of the total length of the roller body, 100% corresponding to a through hole. The at least one receiving opening is preferably arranged in such a way that a mass balance is taken into account, since it is thereby possible to dispense with balancing the roller. Alternatively, two or more receiving openings can also be used be present, which are preferably arranged uniformly in the circumferential direction; This also means that balancing can be dispensed with. As an alternative or in addition to this, there can be two essentially coaxial receiving openings with less than 50% of the total length of the roller body, each with a sensor. As an alternative or in addition to this, two non-coaxial receiving openings, each with more than 50% of the total length of the roller body, each with a sensor, can be present, preferably on opposite end faces of the grinding roller, so that with two sensors the temperature profile for rollers that are longer than the sensors can be measured.

The sensor is preferably designed in the shape of a rod. According to the invention, it is also possible to arrange several sensors in the form of a single rod-shaped measuring device which can be introduced into the receiving opening.

According to the present invention, the problem of the prior art is solved of securely arranging the sensor in the receiving opening of the roller and also reliably protecting it from conceivable extreme operating conditions and also ensuring reliable transmission of the radio signals from the sensor to a data receiver arranged outside the roller.

This is achieved according to the invention in that the sensor is enclosed in the receiving opening by means of a cap made of ceramic material.

In comparison to, for example, plastic caps, the inventive cap made of ceramic material has better temperature resistance and also enables improved transmission of the radio signals from the sensor to a data receiver arranged outside the roller.

According to the invention, any ceramic material which is food-safe (according to the regulations EN10 / 2011, 84/500 / EEC), impact-resistant (no material splintering under the operating conditions of the roller) and temperature-resistant (at least up to a temperature of 400 ° C). In addition, the ceramic material to be used according to the invention should be permeable to electromagnetic waves in the relevant range of radio signal transmission (in particular at around 2.4 GHz). According to the invention, the ceramic material has a high relative permittivity, preferably in the range from 5 to 50, particularly preferably in the range from 25 to 30.

According to the invention, zirconium oxide (ZrO ₂ ), aluminum oxide (AL ₂ O ₃ ) or silicon nitride (Si ₃ N ₄ ) can be used as ceramic material. According to the invention, the ceramic material zirconium oxide (ZrO ₂ ) is particularly preferred.

According to the invention, the cap made of ceramic material preferably has an external thread, an internal thread or both an external thread and an internal thread. With the help of the internal thread, a secure fastening of the cap on the sensor or the measuring device can be achieved. With the aid of the external thread, the cap can be securely fastened in the receiving opening (if it has a corresponding mating thread in the opening area).

The inventive cap made of ceramic material is preferably cylindrical and has, at least in one section, an interior space for receiving the sensor or the data transmitter.

The cap according to the invention made of ceramic material is closed at one end so that the cap, when it is arranged in the receiving opening of the roller, closes this receiving opening from the surroundings. This end preferably has parts Arrangement of a tool for assembling or disassembling the cap with the sensor or the measuring device. These parts can, for example, be depressions in which corresponding components of the tool can be firmly arranged.

According to the invention, the cap made of ceramic material preferably has a length in the range from 10 to 50 mm, preferably 15 to 40 mm and particularly preferably 20 to 30 mm. According to the invention, the cap made of ceramic material also preferably has an outside diameter in the range from 10 to 50 mm, preferably 15 to 40 mm and particularly preferably 20 to 30 mm. According to the invention, the ceramic material cap furthermore preferably has an interior space for receiving the sensor or the data transmitter, which has a length in the range from 5 to 20 mm, preferably 10 to 15 mm, and a diameter in the range from 10 to 30 mm, preferably 15 to 25 mm, wherein the diameter can vary over the length of the interior within the specified range.

According to a preferred embodiment of the present invention, the cap made of ceramic material is additionally fixed by means of a fastening device on the outer end of the receiving opening of the roller. This fastening device is preferably a ring made of a metallic material, for example steel. The fastening device has a geometry which ensures that the fastening device is fixed on the cap made of ceramic material and that it is fixed in the receiving opening of the roller. For example, the fastening device can be a ring with an outside diameter in the range from 20 to 30 mm and an inside diameter in the range from 10 to 20 mm, the width of the ring being in the range from 3 to 10 mm.

According to a further preferred embodiment of the present invention, the sensor or the data transmitter is at least in a section of a material with high electrical conductivity (greater than 10 ⁶ S / m), preferably a metal, for example aluminum or copper, to improve the exit or reception of a Surrounded by radio signal. This material is preferably provided in the form of a film or a ring which surrounds the sensor or the data transmitter, preferably in the head area (ie the area which is inserted into the interior of the cap made of ceramic material).

The present invention further relates to a product processing plant, in particular a grain mill, containing at least one pair of grinding rollers with a roller according to the invention.

The product processing system for processing a product, in particular a grinding system for grinding ground material, contains at least one pair of rollers described above, in particular a pair of grinding rollers. A gap is formed between the rollers of the roller pair. In particular, a grinding gap is formed between the grinding rollers of a pair of grinding rollers. In the context of the invention, only one of the two rollers of the roller pairing has to be designed according to the invention; However, the invention also covers embodiments in which both rollers of the roller pair are designed according to the invention, that is to say contain at least one sensor as described above. In particular when grinding regrind, this regrind is guided essentially vertically downwards through such a grinding gap. In addition, when grinding material to be ground, this material to be ground is preferably fed to the grinding rollers by means of its gravity, and this can optionally be supported pneumatically. The product, in particular the bulk material, in particular the ground material, can be granular and move as a fluid flow through the grinding gap.

In addition, the product processing system can have at least one, in particular idle, data receiver for receiving the measured values transmitted by the data transmitter of at least one of the rollers, in particular both rollers, of the roller pair. The advantages already described above can be achieved with such a product processing system. In particular if the grinding system contains several different pairs of rollers to which the product is fed from the same product inlet, it can be advantageous if only one of the pairs of rollers is designed according to the invention.

The grinding system can be, for example, a single roller frame of a grain mill or a whole grain mill with at least one roller frame, at least one roller frame containing at least one grinding roller described above. Alternatively, it can be a material bed mill in the milling, a flaking mill for oil production from oilseeds or a shot mill in the oil or animal feed industry.

The present invention further relates to a method for operating such a product processing system, comprising the step of detecting the state of a grinding roller according to the invention by means of the sensor arranged in the grinding roller.

The method comprises a step in which the data receiver of the product processing system receives measured values transmitted from a data transmitter at least one of the rollers, in particular both rollers, of the roller pair.

The data received in this way can then be further processed and evaluated. For this purpose, they can be fed to a control unit of the product processing system, in particular the grinding system, from where they can be passed on to an optional higher-level control system. With the aid of the control unit and / or the control system, the entire product processing system, in particular the entire grinding system, or a part thereof, can be controlled and / or regulated.

In particular, the control unit can output a warning message if a predefined warning criterion is met. The warning criterion can consist, for example, in the measured value of at least one of the sensors exceeding a limit value specified for this sensor. In another variant, the warning criterion can consist in the fact that the difference between the largest measured value and the smallest measured value, which are measured by a predetermined number of sensors, exceeds a predetermined limit value. If the warning criterion is met, a warning signal can be output (for example optically and / or acoustically) and / or the product processing system can be brought to a standstill (for example by the control unit). In addition, the control unit can visualize the measured values recorded by the at least one sensor or data obtained therefrom.

According to the invention, the step of detecting the state of the grinding roller is particularly preferably carried out continuously during operation of the product processing system, so that any problem can be detected and remedied promptly.

Fig. 1

eine schematische Ansicht einer erfindungsgemässen Mahlwalze mit darin angeordnetem Sensor

Fig. 2

eine schematische Ansicht einer Aufnahmeöffnung einer erfindungsgemässen Mahlwalze mit darin angeordnetem Sensor

Fig. 3

eine schematische Ansicht einer erfindungsgemässen Kappe aus Keramikmaterial

Fig. 4

eine schematische Ansicht einer erfindungsgemässen Befestigungsvorrichtung

The present invention is explained in more detail below with reference to non-limiting exemplary embodiments and drawings. Show it:

Fig. 1

a schematic view of a grinding roller according to the invention with a sensor arranged therein

Fig. 2

a schematic view of a receiving opening of a grinding roller according to the invention with a sensor arranged therein

Fig. 3

a schematic view of an inventive cap made of ceramic material

Fig. 4

a schematic view of a fastening device according to the invention

Fig. 1 shows a schematic view of a grinding roller 1 according to the invention with a sensor 2 arranged therein. Such grinding rollers 1 are well known. The grinding roller 1 according to this embodiment has four receiving openings 1a (in Fig. 2 shown in more detail), in which a sensor 2 or a measuring device with several sensors can be arranged. The receiving openings 1a are arranged symmetrically (to avoid imbalances) in the circumferential area of the roller, ie close to the outer surface of the roller, in order to determine the physical values corresponding to the roller surface.

Fig. 2 shows a schematic view of a receiving opening 1a of a grinding roller 1 according to the invention with a sensor 2 arranged therein. The sensor 2 is located completely in the receiving opening 1a. A cap 4 made of ceramic material, preferably zirconium oxide, is fixed on the head 3 of the sensor 2. The cap 4 made of ceramic material closes the receiving opening 1a from the environment and thus protects the sensor 2 or prevents any product contamination due to damage to the sensor 2.

The cap 4 made of ceramic material is fixed with the aid of a fastening device 5, preferably a steel ring, on the outer end of the receiving opening 1a.

In order to improve the exit or reception of a radio signal, the sensor 2 according to this embodiment is surrounded in the area of its head 3 by a material 6 with high electrical conductivity, preferably a metal. According to the embodiment shown here, the material 6 with high electrical conductivity surrounds the head 3 of the sensor 2 in the form of a film or a ring.

Fig. 3 shows a schematic view of a cap 4 according to the invention made of ceramic material. The cap 4 has an interior space (in the form of a blind hole) for receiving the sensor 2 and is designed at its closed end in such a way that a fastening device such as that in FIG Fig. 4 Ring 5 shown can be fixed.

Fig. 4 shows a schematic view of a fastening device 5 according to the invention, here in the form of a metal ring. The fastening device 5 is designed in such a way that it is mounted on a cap 4 made of ceramic material such as that in FIG Fig. 3 Cap 4 shown can be fixed.

Claims (15)

Grinding roller (1) for use in a pair of grinding rollers, in particular a pair of grain rollers, comprising - At least one sensor (2) for detecting measured values that characterize a state of the grinding roller, the sensor (2) being arranged in a receiving opening (1a) of the grinding roller (1), - At least one data transmitter (3) for contactless transmission of the measured values from the at least one sensor (2) to a data receiver, characterized in that the sensor (2) is enclosed in the receiving opening (1a) by means of a cap (4) made of ceramic material. Grinding roller according to Claim 1, characterized in that the cap (4) made of ceramic material is fixed to the outer end of the receiving opening (1a) by means of a fastening device (5). Grinding roller according to Claim 2, characterized in that the fastening device (5) is a ring made of a metallic material. Grinding roller according to one of the preceding claims, characterized in that the cap (4) is made of ceramic material made of zirconium oxide (ZrO ₂ ). Grinding roller according to one of the preceding claims, characterized in that the sensor (2) at least in a section of a material (6) with high electrical conductivity, preferably a metal, to improve the Is surrounded exit or reception of a radio signal. Grinding roller according to Claim 5, characterized in that the sensor (2) is surrounded in the area of its head (3) by the material (6) with high electrical conductivity. Grinding roller according to Claim 5 or 6, characterized in that the material (6) with high electrical conductivity surrounds the sensor (2) in the form of a film or a ring. Grinding roller according to one of the preceding claims, characterized in that the sensor (2) has at least one unit for supplying energy to the sensor (2), preferably a battery. Grinding roller according to one of the preceding claims, characterized in that the sensor (2) has at least one electronic component for data transmission, signal conversion or both. A pair of grinding rollers, in particular a pair of grain rollers, comprising at least one grinding roller (1) according to one of the preceding claims 1 to 9. Product processing plant, in particular a grain mill, containing at least one pair of grinding rollers according to claim 10. A method for operating a product processing system according to claim 11, comprising the step of detecting the state of a grinding roller (1) according to one of claims 1 to 8 by means of the sensor (2) arranged in the grinding roller (1). Method according to claim 12, characterized in that the step of detecting the state of the grinding roller (1) is carried out continuously during the operation of the product processing plant. Sensor cap (4) made of ceramic material which is configured or adapted for use as a cap (4) for enclosing a sensor (2) in a receiving opening (1a) of a grinding roller (1) according to one of the preceding claims 1 to 9. Kit consisting of a sensor cap (4) according to claim 14 and a fastening device (5), in particular a fastening device (5) consisting of a ring made of a metallic material.

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