EP2113608A2 - Scraper device and grater device - Google Patents

Abstract

The scraping device (1) comprises a scraper blade (2) for cooperating with a movable surface (6), a holding device for the scraper blade, a device (5) for generating a contact pressure for pressing the scraper blade on the movable surface, and a device (8) for indirectly detecting one of the pressing force and/or contact pressure of indirectly characterizing parameters over a partial area of the extension of the scraper blade. The detection device has piezoelectric sensors arranged over the length of the scraper blade, which considerably corresponds to the extension of the scraper blade. The scraping device (1) comprises a scraper blade (2) for cooperating with a movable surface (6), a holding device for the scraper blade, a device (5) for generating a contact pressure for pressing the scraper blade on the movable surface, and a device (8) for indirectly detecting one of the pressing force and/or contact pressure of indirectly characterizing parameters over a partial area of the extension of the scraper blade. The detection device comprises piezoelectric sensors arranged over the length of the scraper blade, which considerably corresponds to the extension of the scraper blade in a width direction of the movable surface. The scraper blade comprises two scraper blade sections, which are arranged adjacent to each other over the length of the scraper blade. One of the scraper blade sections has piezoelectric sensor under the formation of a measuring frame. The scraper blade sections have different lengths. The piezoelectric sensors are arranged at one of the scraper blade sections. The piezoelectric sensors arranged over the length of the scraper blade and/or the scraper blade sections are respectively arranged with equal distance (c) from a blade end of the scraper blade acting on the movable surface and are respectively arranged to each other with variable distance (a 1, a 2) viewed in the longitudinal direction of the scraper blade. The piezoelectric sensors are arranged at a blade upper side that is aligned away from a contact area at the movable surface and/or a blade lower side that is turned to the contact area at the movable surface, are arranged within the extension of the contact area at the movable surface, are arranged on the blade upper surface, are arranged in recesses arranged on the blade upper surface, have a circular shape, whose extension is equally dimensioned in two vertical directions to each other, have an elongate shape whose extension is differently dimensioned in two vertical directions to each other, are relatively arranged to each other parallel in relation to its larger extension, and are arranged at an angle (alpha ) of 90[deg] to the longitudinal direction of the scraper blade. An individual support area bearing the piezoelectric sensor at the scraper blade and/or scraper blade sections is uncoupled by the remaining support areas and/or free areas from the sensor. The scraper blade and/or scraper blade sections have open-edged recesses or cuts on both sides of the sensors. The sensors are individually or groupwisely mutually coupled with a data acquisition device and/or an evaluation device. The coupling is carried out as electrical coupling, is wireless, has line connections and are designed as infrared connection or radio communication. The data acquisition device and/or evaluation device are formed by a controller and/or a regulator and a computer. An independent claim is included for a doctor blade device.

Description

The invention relates to a scraper device comprising a doctor blade for interacting with a movable surface, a holding device for the doctor blade, a device for generating a contact pressure for pressing the doctor blade to the movable surface and means for at least indirectly detecting a contact pressure and / or Contact pressure over at least a portion of the extension of the doctor blade at least indirectly descriptive size. The invention further relates to a doctor device.

Scraper devices for cleaning movable surfaces or doctor devices for equalizing application media to movable surfaces are previously known in a variety of prior art designs. In this case, the adjustment of the blades in scraper devices takes place counter to the direction of movement of the movable surface, while in squeegee devices, in particular stripping devices, the employment takes place in the direction of movement and spaced from the surface. When used in machines for the production of fibrous webs, which are usually characterized by a very large machine width, the problem is often to ensure a secure operation across the width of a predefined required contact pressure and / or a required contact pressure distribution and / or a uniform Distance between blade and surface to achieve. In this case, the deflection caused by large blade lengths plays an essential role. Furthermore, the contact pressure and / or the contact pressure during operation may vary due to further influences. For measuring the contact pressure and / or the contact pressure and its distribution profile therefore means for at least indirect detection of the contact pressure and / or the contact pressure are at least indirectly characterizing size previously known. The measurement takes place either directly or indirectly.

From the publication EP 1 259 377 B1 an embodiment is previously known, in which in a doctoring device on the doctor blade at least one strain gauge sensor is arranged, with which the application of the scraper to the roller whose contact pressure is measurable. The measurement of the contact pressure can also take place during normal operation, since the scraper does not have to be lifted off the roller. The measurement of the contact pressure by means of strain gauge sensor is based on the principle of deflection of the doctor blade in response to the contact pressure, wherein the strain gauge is stretched or compressed by the bending of the scraper and thereby changes its resistance. This can be measured and converted into the corresponding contact pressure. In this case, the arrangement of a plurality of strain gauge sensors over the width of the movable surface is distributed to the doctor blade. However, since the strain gages respond to a geometric change with a changed current conductivity, whereby the applied contact pressure can be determined by means of calibration, it is absolutely necessary to have a power source which continuously conducts current to the sensors.

A further embodiment of a scraper device to be used in a machine for producing fibrous webs with a support beam, a blade holder arranged thereon, in which a scraper blade is used for scraping off the roller or a correspondingly moving surface, is known from US Pat EP 1 244 850 B1 previously known. The scraper blade or the blade holder in this case have one or more sensors, which are arranged inside or outside and are intended to measure the wear and / or the tension of the blade holder and / or the scraper blade, wherein one or more serving as a sensor optical fibers in Inside the blade holder and / or the doctor blade are arranged. This version is designed for the specific sensor version. The optical fibers are in the Integrated arrangement, which has to be considered in the structural design.

From the publication EP 1 584 745 B1 a calibration device is previously known, by means of which the contact pressure of an adjacent to the circumference of a roll or a cylinder in a paper machine blade of a scraper device can be controlled. This device is characterized in that on a holding blade, a sensor holder is provided, which is provided with a pressure sensor, wherein the holding blade, the sensor holder and the pressure sensor are positionable such that the position of the pressure sensor on the circumference of the roller or the cylinder the investment of the Blade matches. This device is used for calibrating, in particular for determining the contact pressure, wherein the blade is replaced after the calibration process by the actual doctor blade, with the contact pressure on the doctor blade edge can be generated reproducible. The single pressure sensor can be designed differently. Preferably, this is designed as a tactile pressure sensor, in particular as a piezoelectric sensor. The solution is characterized in that although a calibration of the contact pressure can be carried out in advance, but in the application of the contact pressure is not further monitored and due to the lack of monitoring and no adjustment to changing boundary conditions.

The invention is therefore based on the object, a scraper device of the type mentioned in such a way that on the one hand, the contact pressure and the distribution profile over the width of the movable surface can be determined as needed, the device for detecting the contact pressure can work independently and also the device for Detection can be used for any length of scraper. The solution of the invention should be characterized by a low design and control engineering effort.

The solution according to the invention is characterized by the features of claim 1. Advantageous embodiments are given in the subclaims. A doctor device according to the invention is described in claim 28.

A scraper device comprising a scraper blade for cooperation with a movable surface, a holding device for the scraper blade, a device for generating a contact pressure for pressing the doctor blade to the movable surface and means for at least indirectly detecting the contact pressure and / or the contact pressure at least indirectly descriptive size over at least a portion of the extension of the scraper blade is inventively characterized in that the means for at least indirectly detecting a contact force and / or the contact pressure at least indirectly characterizing size comprises at least a portion of the extension of the doctor blade at least one piezoelectric sensor.

Piezoelectric sensors are active sensors which are preferably used for fast and timely detection of dynamically changing measured variables. The operation of piezoelectric sensors is based on the induction of stresses under the influence of elastic stress states in the carrier region of the piezoelectric sensors. An external voltage supply is thus not necessary, which has a considerable constructive and energetic advantage. The contact pressure can be determined directly and promptly. The sensors are very small and compact, so that they can be arranged free of any impairment of the functioning of the doctor blade on or at this. Furthermore, piezoelectric sensors are very robust and can deliver reproducible values over longer periods of time. The sensors enable reliable detection during operation of the scraper device. The attachment can be done on blades made of different materials and with different surface finish.

The scraper device is a device for cleaning movable surfaces. The employment of the blade is opposite to the direction of movement of the movable surface.

Since the piezoelectric sensor detects the stress states in its carrier region, a plurality of piezoelectric sensors are preferably provided for determining pressure profiles over the length of the doctor blade, which corresponds to the extension of the doctor blade in the width direction of the movable surface and / or over the length of doctor blade component regions.

In an advantageous further development, the doctor blade comprises at least two doctor blade parts, which are arranged adjacent to each other over the length of the doctor blade, at least one of the doctor blade parts having piezoelectric sensors. The scraper blade part having the piezoelectric sensors forms a measuring beam. By dividing the doctor blade into several subsections doctor blades of different lengths can be formed by means of individual standardized prefabricated Schaberklingenteilstücke, which are then universally applicable. By prefabricating measuring bars, these can be kept as standardized functional units and integrated at any desired point into a doctor blade structure over the length of the doctor blade. The measuring locations can be arranged arbitrarily in terms of their location. The measuring bars form a functional unit for cleaning the surface and for simultaneously detecting the pressing state of the blade.

According to an advantageous embodiment, to simplify the evaluation of the measured variables, the piezoelectric sensors arranged over the length of the doctor blade and / or of the individual measuring beam are each arranged at the same distance from the blade end acting on the movable surface on the blade.

Preferably, to simplify the evaluation of the measured variables and any desired arrangement of the scraper blade parts designed as measuring beams, the piezoelectric sensors arranged over the length of the scraper blade and / or a scraper blade part are each viewed at a constant distance from one another in the length direction of the scraper blade. As a result, meaningful distribution profiles for the contact pressure over the length of the doctor blade can be created with support from a large number of measuring points.

In order to avoid impairing their operation, the piezoelectric sensors can be arranged on the blade underside directed away from the contact area on the surface of the doctor blade, but it is also possible to arrange the sensors on the top of the blade or on both sides of the blade, if this is advantageous or necessary due to the installation situation is. According to a particularly advantageous embodiment for the direct detection of the measured variables, the piezoelectric sensors are arranged on the movable surface within the extent of the contact region. When mounted on the underside of the blade, no special modifications are required. The piezoelectric sensors can be easily arranged on the blade surface, for example by means of an adhesive connection.

In an alternative embodiment, the piezoelectric sensors may be disposed in recesses disposed on the blade surface. As a result, an arrangement in the contact area of the doctor blade on the doctor blade front side is possible.

According to a preferred embodiment, the piezoelectric sensors may have a round shape whose extension is substantially equal in two mutually perpendicular directions lying in a plane. This shape is easy to produce.

According to an alternative embodiment, the piezoelectric sensors may also have an elongate shape whose extent is different in size in two mutually perpendicular directions lying in a plane. This embodiment allows a targeted adjustment of the orientation of the sensors relative to each other and relative to an extension direction of the doctor blade with the corresponding possibility of modeling the evaluable signal.

Particularly preferably, the elongate piezoelectric sensors are arranged relative to each other in parallel with respect to their greater extent. As a result, a homogenization of the sensor signal across the entire width is possible.

The elongated piezoelectric sensors can be arranged inclined at an angle to the length direction of the doctor blade. The angle should be greater than 0 °, preferably greater than 45 °, particularly preferably approximately 90 °. The greater the angle between the direction of extension of the sensor and the direction of extension of the doctor blade, the more accurately the force acting on the sensor can be measured.

In a particularly advantageous embodiment, the individual carrier region carrying the piezoelectric sensor on the doctor blade and / or on the individual doctor blade part is decoupled from the remaining carrier areas or free areas of piezoelectric sensors in order to actually free only the voltage states in the arrangement region of piezoelectric sensors from being influenced by deformation states in each adjacent area to capture. In the simplest case, the scraper blade and / or the individual scraper blade part have edge-open recesses or cuts on both sides of a piezoelectric sensor.

The piezoelectric sensor as encoder detects actual quantities of measured values that can be evaluated and / or as input variables for Controls / regulations are used. The piezoelectric sensors of a scraper blade and / or a scraper blade part are for this purpose individually or in groups or coupled together with a data receiving and / or evaluation. The coupling can be designed as an electrical coupling or wirelessly. In the first case, this includes line connections using single lines or a serial interface. The cable connections and the areas of the doctor blade provided with sensors can be completely or partially protected by a suitable cover or housing. The wireless connection can be via infrared or radio. For this purpose, corresponding transmitting and / or receiving devices are required, which are coupled to the sensor and / or the data acquisition and / or evaluation or form a structural unit.

The data acquisition and / or evaluation device is preferably formed for further processing and adjustment of the contact pressure of a control and / or regulating device and / or a personal computer.

The inventive solution of using piezoelectric sensors is also applicable to doctor devices. These also include a blade, however, for equalizing a medium on a movable surface, a holding device for the blade, means for generating a pressure for the purpose of positioning the blade relative to the movable surface and means for at least indirectly detecting a contact force and / or the contact pressure over at least a portion of the extension of the blade at least indirectly descriptive size. The device for at least indirectly detecting a size which at least indirectly characterizes the contact force and / or the contact pressure comprises at least one piezoelectric sensor, preferably a plurality of piezoelectric sensors arranged over the extension of the blade in the length direction. Regarding the arrangement of these over the length, with respect to the blade end and the Surfaces and the coupling with data processing equipment, the same statements apply, as already performed for the scraper device.

Fig. 1a und 1b

verdeutlichen eine erfindungsgemäß ausgebildete Schabervorrichtung in zwei Ansichten;

Fig. 2

verdeutlicht eine Weiterentwicklung einer erfindungsgemäßen Schabervorrichtung gemäß Figur 1 mit einer Schaberklinge aus einer Mehrzahl von Schaberklingenteilen;

Fig. 3a und 3b

verdeutlichen eine Weiterentwicklung einer Schabervorrichtung gemäß Figur 1 mit einer Schaberklinge aus einer Mehrzahl von Schaberklingenteilen;

Fig. 4

verdeutlicht eine besonders vorteilhafte Ausführung eines erfindungsgemäß ausgebildeten Messbalkens;

Fig. 5

verdeutlicht eine Ausführung mit alternativer Anordnung der piezoelektrischen Sensoren zu Figur 1b;

Fig. 6a und 6b

verdeutlichen zwei Ausführungen erfindungsgemäßer Vorrichtungen mit unterschiedlichen Möglichkeiten der Datenübertragung.

The solution according to the invention is explained below with reference to figures. It details the following:

Fig. 1a and 1b

illustrate a scraper device designed according to the invention in two views;

Fig. 2

illustrates a further development of a scraper device according to the invention FIG. 1 with a scraper blade of a plurality of scraper blade parts;

Fig. 3a and 3b

clarify a further development of a scraper device according to FIG. 1 with a scraper blade of a plurality of scraper blade parts;

Fig. 4

illustrates a particularly advantageous embodiment of an inventively designed measuring beam;

Fig. 5

illustrates an embodiment with alternative arrangement of the piezoelectric sensors to FIG. 1b ;

Fig. 6a and 6b

illustrate two versions of devices according to the invention with different possibilities of data transmission.

The FIGS. 1a and 1b illustrate in schematic highly simplified representation of the basic structure of an inventively designed scraper device 1 in two views. The FIG. 1a clarifies a view from the right, the Figure 1 b a view A according to FIG. 1a , To clarify the In individual directions, a coordinate system is applied to the scraper device 1. When used in machines for producing material webs, this corresponds to the coordinate system usually applied to them. The X direction describes the machine direction, ie the direction of passage of the material web, the Y direction the width direction and the Z direction the height direction.

The scraper device 1 comprises at least one scraper blade 2, which is mounted in a blade holder 3 on a carrying device 4. The doctor blade 2 is flying, i. mounted on one side in the region of an end region 7 in the blade holder 3. The remaining part of the doctor blade 2 extends cantilevered away from the blade holder 3. With regard to the execution of the blade holder 3, there are a large number of possibilities, which will not be discussed in detail here, since they are already generally known. However, the blade holder 3 is preferably designed in several parts.

Furthermore, the doctor blade 2 is assigned at least one device 5 for generating a contact pressure for pressing against a movable surface 6, in particular in the form of a rotatable curved surface. The rotatable surface is usually formed when used in machines for producing webs of material, in particular fibrous webs in the form of paper, board or tissue webs of the lateral surface of a cylindrical body in the form of a roll or a cylinder. The scraper blade 2 is used to clean the movable surface 6 and, in particular in the case of a material web break, avoiding wrapping the roller forming the movable surface with the material web. For this purpose, the doctor blade 2 acts with its freely projecting end portion 13 at least indirectly tribologically together with the movable surface 6. The doctor blade 2 is set against the direction of movement of the rotatable surface 6. The adjustment of the scraper blade 2 is denoted by 12.

The scraper device 1 further comprises at least one device 8 for at least indirect detection of a pressing force and / or the contact pressure of the scraper blade 2 to the movable surface 6 at least indirectly characterizing size. "At least indirectly" includes both a direct detection of the pressure as well as the detection of with the contact pressure on functional relationships or in relation to each other standing sizes.

According to the invention, the device 8 comprises at least one, preferably a plurality, of piezoelectric sensors 9 arranged on or in the scraper blade 2. The extent of the scraper blade 2 in the width direction or Y direction of the movable surface 6 is considered over the extent of the scraper blade 2 the scraper blade 2 corresponds, preferably at least two, most preferably a plurality of such piezoelectric sensors 9.1 to 9.n provided, which may be arranged spaced from each other depending on the design in different ways. Such piezoelectric sensors 9.1 to 9.n generate a current under elastic stresses by forming electrical charges. This can be recorded and used to determine the contact pressure or the contact pressure. A major advantage of the piezoelectric sensors 9.1 to 9.n is that they do not require an energy source.

In the in Figure 1 b illustrated embodiment is a view A of a doctor blade 2 from above according to FIG. 1a reproduced, in which case the representation of the blade holder 3 has been omitted in detail. It can be seen that the doctor blade 2 has piezoelectric sensors 9.1 to 9.n. The arrangement takes place in the case shown on a blade back or top 10 of the doctor blade, that is, the surface facing away from the moving surface 6 of the doctor blade 2. This is a the Anstellbereich 12 forming blade front or -unterseite 11 opposite. The arrangement seen on the blade top 10 in use position offers the advantage that the individual piezoelectric sensors 9.1 to 9.n possible direct Effective range of the doctor blade 2 on the movable surface 6, which corresponds to the Anstell- or contact area 12 of the doctor blade 2, can be arranged. As a result, the deformations of the doctor blade 2 can be determined as optimally as possible in the actual deformation range or effective range and the contact pressure in this area can be detected very accurately.

The arrangement on the blade bottom 11, which is directed to the movable surface 6 in use position, is also possible, but here a displacement out of the effective area or an arrangement in recesses on the blade front side 11 would be necessary to avoid disturbing effects. Also, a two-sided arrangement of sensors 9.1 to 9.n is possible if the installation situation or the operating parameters require or appear to be advantageous. The arrangement can also be carried out between blade holder 3 and the blade end region 13, so that the contact pressure can be determined via the voltages propagating in the doctor blade 2 in the region of the blade holder 3 or between the latter and the blade end region 13.

The FIG. 1b illustrates an embodiment of a substantially across the width b _{6 of} the movable surface 6 extending doctor blade 2. The extension corresponds to the length I of the doctor blade. The arrangement of the piezoelectric sensors 9.1 to 9.n is characterized in that they are viewed at a uniform distance a from each other in the width direction of the movable surface 6, or in the length direction of the doctor blade 2 are arranged. The arrangement is further carried out on the blade bottom 10 of the doctor blade 2 on a theoretical axis, which is arranged parallel to the bearing axis of the movable surface 6, in particular of the rotating roller or the cylinder. This arrangement also corresponds to the arrangement at the same distance from the blade holder 3 or in each case the same distance c viewed from the blade end 13 from.

The FIG. 1b clarifies a fundamental possibility. Advantageous developments are in the FIGS. 2 to 6 played.

According to FIG. 2 the doctor blade is divided into individual scraper blade parts 2.1 to 2.n. The scraper device 1 is set over the width b _{6 of} the movable surface of the individual scraper blade parts 2.1 to 2.n, here 2.1 to 2.3 together. Each of these individual scraper blade parts 2.1 to 2.3 is fixed in the blade holder 3 to the support means 4. In this case, a scraper blade part 2.1 to 2.3 can each be assigned a separate device 5.1 to 5.3 for contact pressure, or a device 5 is assigned to all scraper blade parts 2.1 to 2.n together. This embodiment is exemplary in the FIG. 2 clarified. The individual scraper blade parts 2.1 to 2.3 can according to the embodiment in FIG. 2 preferably be executed identically. These are characterized by the same length I ₂ . The arrangement preferably takes place next to one another or adjacent to one another via the extent of the doctor blade 2 in the width direction of the movable surface 6.

The device 8 for at least indirectly detecting a size which at least indirectly characterizes the contact force and / or the contact pressure here comprises a plurality of partial devices 8.1 to 8.3, which are respectively arranged on the individual doctor blade parts 2.1 to 2.3. This means that the individual scraper blade parts 2.1 to 2.3 each have at least one or a plurality of piezoelectric sensors 9.11 to 9.nn, here 9.11 to 9.1 n, 9.21 to 9.2n and 9.31 to 9.3n. By dividing into a plurality of scraper blade parts 2.1 to 2.n so-called measuring beam 14, here 14.1 to 14.3 can be formed, so that the measuring locations over the width of the movable surface 6 can be arranged arbitrarily distributed. Furthermore, the individual measuring bars 14.1 to 14.3 can be provided as prefabricated standard modules for doctor blades 2, which are then used in the formation of a doctor blade 2 and thus can be used for different widths of the movable surface 6 by the measuring bars 14.1 to 14.n in desired and optimal way combined with each other or with piezoelectric sensors free blade parts.

The FIG. 2 illustrates an embodiment with preferably uniformly executed and evenly distributed over the width of the movable surface 6 arranged measuring beam 14.1 to 14.n. In contrast, illustrates the FIG. 3a an embodiment of a doctor blade 2 with different sized measuring beam 14.1 to 14.5 to replicate the required length of the doctor blade 2. The possibility of arranging and dividing the doctor blade 2 into individual doctor blade parts 2.1 to 2.5, which may be different sizes, there is the possibility of different to simulate long scraper blades 2. The individual lengths of the scraper blade parts 2.1 to 2.5 are designated here by I _2.1 to I _2.5 . The individual measuring bars 14.1 to 14.n are characterized here by way of example in each case by a different number of piezoelectric sensors 9.11, 9.21 to 9.22, 9.31 to 9.3n, 9.41 to 9.42 and 9.5. Furthermore, different roller widths can be measured with this design. In the case shown, furthermore, the individual sensors of a measuring beam 14.2, 14.3 and 14.4 are each arranged at a constant distance a from each other.

Depending on the desired accuracy and number of measuring points along the width b _{6 of} the movable surface 6, in particular the cylinder or the roller, it is also conceivable to use a smaller number of Schaberklingenteile 2.1, 2.3 and 2.5 forming measuring beam 14.1 to 14.3, for example a on the drive side, one on the leader side and one in the middle of the roller, the remainder of scraper blade parts 2.2 and 2.4 being free of such devices 8 for at least indirect detection of a magnitude at least indirectly characterizing the contact pressure and / or contact pressure, such as in FIG FIG. 3b shown.

In order to precisely with such formed measuring beam 14.1 to 14.n with greater length, the individual adjacently arranged sensors 9.1 to 9.n free from to keep the deformation in the adjacent areas, as in FIG. 4 in a view of the scraper blade 2 on both sides next to each of the piezoelectric sensors 9.1 to 9.n incisions, especially in the form of open-edged recesses 15.11 to 15.nn incorporated in the blade material, so that the single piezoelectric sensor 9.1 to 9.n only at his Carrier area 16.1 to 16.n measures existing load. The notches or recesses 15.11 to 15.nn, which are denoted here for example for the piezoelectric sensor 9.1 with 15.11, 15.12, for the sensor 9.2 with 15.21, 15.22 and for the illustrated sensor 9.3 with 15.31 and 15.32, serve the mechanical, on the Deformation related decoupling of the individual piezoelectric sensors 9.1 to 9.3 of the respective adjacent Schaberklingenbereichen. The areas between the individual piezoelectric sensors 9.1 to 9.3 are each free of such sensors and here designated 17.1 and 17.2, wherein the deformation in the areas 17.1 and 17.2 due to this decoupling, in particular the mechanical decoupling of the carrier areas 16.1 to 16.3 of the adjacent , areas free of piezoelectric sensors do not affect the measurement.

The FIG. 5 illustrates for illustrative purposes, a further embodiment with a measuring beam 14.1 with different distances a ₁ , a ₂ , a ₃ each other in the length direction of the doctor blade 2 viewed arranged piezoelectric sensors 9.1 to 9.n. The individual piezoelectric sensors 9.1 to 9.n are further arranged at different distances from the blade end 13. This distance is denoted here by c ₁ and c ₂ .

Reading out the data and further processing can be done in different ways. According to a first embodiment in FIG. 6a an electrical coupling 18 is provided. This is usually done via line connections by the data from the individual sensor 9.1 to 9.n are passed to a corresponding readout unit 19 and / or data acquisition and / or evaluation device 20, which performs the function of Data processing takes over. The data acquisition and / or evaluation device 20 can be formed by a control and / or regulating device 21, an evaluation device 22, for example in the form of a personal computer.

The FIG. 6b contrast illustrates an embodiment with wireless data transmission. As a result, the number of hanging and disturbing lines can be avoided. For this purpose, the individual piezoelectric sensors 9.1 to 9.1n or 9.21 to 9.2n of a measuring beam 14.1, 14.2 assigned at least one transmitting device 23.1, 23.2, via which the data from the piezoelectric sensors 9.1 to 9.n a measuring beam 14.1, 14.2 to a Receiving device 24 directed or sent. The receiving device 24 may be designed in many forms. This may be a separate receiving device, a receiving device 24 that can be coupled to an evaluation device, a control and / or regulating device, a PC, or a receiving device that can be integrated into it, for example an integrated interface 25.

According to a particularly advantageous embodiment, each of the individual piezoelectric sensors 9.1 to 9.n is assigned its own transmitting device. This allows a precise assignment of the data specifically related to the specific arrangement and location of a single piezoelectric sensor and acting in this area contact pressure and / or contact pressure.

In the FIGS. 1 to 6 For example, the piezoelectric sensors 9.1 to 9.n are in each case designed as essentially round structures, the dimensions of which are dimensioned substantially equal in two mutually perpendicular directions lying in one plane (XY plane). However, it is expressly possible to form the sensors 9.1 to 9.n as elongated shapes, which thus differ in their two mutually perpendicular extension directions are dimensioned. Such trained sensors 9.1 to 9.n may be present as oblong rounded or oval shapes as well as elongated rectangular or polygonal shapes.

If the sensors 9.1 to 9.n are elongated, they can assume different or the same orientations relative to each other and relative to the direction of extent of the doctor blade 2. Since a maximum signal can be obtained if the extension direction of the sensors 9.1 to 9.n is substantially parallel to the X direction or machine direction or perpendicular to the extension direction of the doctor blade 2, an arrangement of the sensors 9.1 to 9.n below is recommended a non-zero angle α between the longitudinal extent of the sensors 9.1 to 9.n and the longitudinal extension of the doctor blade 2. The angle α should be as large as possible, preferably more than 45 °, be approximately 90 ° in the best case, when the sensors 9.1 to 9.n or coupling lines or other technical restrictions eg in terms of space allow this.

In this case, the sensors 9.1 to 9.n are preferably arranged parallel to one another, since the signal output by a sensor 9 varies due to its orientation when the shaping is not round. A parallel arrangement is thus to be preferred, since each sensor 9.1 to 9.n then provides a comparable signal; However, it is also possible to arrange the sensors 9.1 to 9.n different and to adjust the different signals by a suitable calibration or software in the evaluation device 22.

Moreover, the embodiments described above, which comprise regions 17, scraper blade parts 2.1 to 2.n or recesses 15 and have different spacings of the sensors 9.1 to 9.n with each other and relative to the blade extension, etc., of the shape of the sensors 9.1 to 9 remain. n untouched. In particular, the individual features of the embodiments can be combined as desired in accordance with the requirements of the measurement.

When arranged in a scraper device 1, the individual measuring bars can be arranged at a distance from one another. In a squeegee device, preferably, to ensure a uniform distance between the blade and the surface across the width of the movable surface, a blade integrally formed over the length is employed. This corresponds to the embodiment according to FIG. 1b , The arrangement of the piezoelectric sensors 9.1 to 9.n is preferably carried out at a constant distance from one another. However, variable distances are also conceivable in the length direction of the blade.

Since the environment in which the doctor blades and doctor devices described are used are subject to high mechanical and chemical stress, in particular the cable connections leading to the data acquisition and evaluation device 20 and to the open-loop and closed-loop control device 21 as well as the areas of the doctor blades provided with sensors can be used. or doctor blade to be fully or partially protected by a suitable cover or housing.

LIST OF REFERENCE NUMBERS

1

scraper device

2

scraper blade

2.1 - 2.n, 2.1-2.5

Scraper blade parts

3

blade holder

4

support means

5

Device for pressing

6

Movable surface

7

end

8th

Device for at least indirect detection of a contact force and / or the contact pressure at least indirectly descriptive size

8.1 - 8.n

partial device

9, 9.1 - 9.n

piezoelectric sensors

9.11, 9.21, 9.22, 9.31-9-3n, 9.41, 9.42, 9.5

piezoelectric sensors

10

Blades top

11

Blade bottom

12

Anstellbereich

13

blade end

14.1 - 14.n

measuring beam

15.11 - 15.32

recess

16.1 - 16.3

support area

17.1, 17.2

Area

18

electrical coupling

19

readout unit

20

Data acquisition and / or evaluation device

21

Control and / or regulating device

22

evaluation

23.1, 23.2

transmitting device

24

receiver

25

interface

a

distance

a ₁

distance

a ₂

distance

b ₆

Width of the movable surface

c

distance

c ₁

distance

c ₂

distance

I, I ₂

length

I _2.1, I _2.2 , I _2.3, I _2.4, I _2.5

length

I _13.1, I _13.2

length

Claims (34)

Scraper device (1) comprising a scraper blade (2) for cooperation with a movable surface (6), a holder (3) for the scraper blade, means (5) for generating a contact pressure for pressing the scraper blade (2) to the movable surface (6) and means (8) for at least indirect detection of a pressure force and / or the contact pressure over at least a portion of the extension of the doctor blade (2) at least indirectly characterizing size,
characterized,
that the device (8) for at least indirectly detecting the contact force and / or the contact pressure at least indirectly characterizing the at least one piezoelectric sensor (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9:41, 9:42, 9.5). Scraper device (1) according to claim 1,
characterized,
in that the device (8, 8.1 to 8.n) for the at least indirect detection of a size at least indirectly characterizing the contact force and / or the contact pressure is a plurality of the length (I) of the scraper blade (2) which corresponds to the extension of the scraper blade (2 ) in the width direction of the movable surface (6), arranged arranged piezoelectric sensors (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5). Scraper device (1) according to claim 1 or 2,
characterized,
that the doctor blade (2) includes at least two doctor blade elements (2.1 to 2.n, 2.1, 2.2, 2.3, 2.4, 2.5), which over the length (I) of the doctor blade (2) viewed are arranged adjacent to each other, wherein at least one of Scraper blade parts (2.1 to 2.n, 2.1, 2.2, 2.3, 2.4, 2.5) at least one piezoelectric sensor (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) under training a measuring beam (14, 14.1, 14.2, 14.3, 14.4, 14.5). Scraper device (1) according to claim 3,
characterized,
in that on the at least one scraper blade part (2.1 to 2.n, 2.1, 2.2, 2.3, 2.4, 2.5) a plurality of piezoelectric sensors (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) are arranged. Scraper device (1) according to one of claims 3 or 4,
characterized,
that the individual scraper blade parts (2.1 to 2.n, 2.1, 2.2, 2.3, 2.4, 2.5) have different lengths (I _2.1 , I _2.2 , I _2.3 , I _2.4 , I _2.5 ). Scraper device (1) according to one of claims 1 to 5,
characterized,
in that the piezoelectric sensors (9, 9.1 to 9.n, 9.1, 12) arranged over the length (I) of the scraper blade (2) and / or of the individual scraper blade part (2.1 to 2.n, 2.1, 2.2, 2.3, 2.4, 2.5) 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) are each arranged at the same distance (c) from the blade end (13) acting on the movable surface (6) on the doctor blade (2). Scraper device (1) according to one of claims 1 to 6,
characterized,
that over the length (I) of the doctor blade (2) and / or the individual Schaberklingenteiles (2.1 to 2.n, 2.1, 2.2, 2.3, 2.4, 2.5) arranged piezoelectric sensors (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) are each arranged at a constant distance (a) to each other in the length direction of the doctor blade (2). Scraper device (1) according to one of claims 1 to 6,
characterized,
that the length (I) of the doctor blade (2) and / or a doctor blade portion (2.1 to 2.n, 2.1, 2.2, 2.3, 2.4, 2.5) arranged piezoelectric sensors (9, 9.1 to 9.n, 9.1, 21.9 , 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) each with a variable distance (a ₁ , a ₂ ) are arranged to each other in the length direction of the doctor blade (2) viewed. Scraper device (1) according to one of claims 1 to 8,
characterized,
in that the piezoelectric sensors (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) on the blade upper side (10), which extend from the abutment region (12) on the movable surface (6). is directed away and / or on the blade bottom (11), which faces the abutment region (12) on the movable surface (6) are arranged. Scraper device (1) according to claim 9,
characterized,
in that the piezoelectric sensors (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) are arranged on the movable surface (6) within the extension of the abutment region (12). Scraper device (1) according to one of claims 1 to 10,
characterized,
in that the piezoelectric sensors (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) are arranged on the blade surface. Scraper device (1) according to one of claims 1 to 10,
characterized,
in that the piezoelectric sensors (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) are arranged in depressions arranged on the blade surface. Scraper device (1) according to one of claims 1 to 12,
characterized,
in that the piezoelectric sensors (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) have a round shape whose extent is dimensioned substantially equal in two mutually perpendicular directions. Scraper device (1) according to one of claims 1 to 12,
characterized,
in that the piezoelectric sensors (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) have an elongated shape whose extent is dimensioned differently in two mutually perpendicular directions. Scraper device (1) according to claim 14,
characterized,
in that the elongate piezoelectric sensors (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) are arranged relative to each other in parallel with respect to their greater extent. Scraper device according to claim 14 or 15,
characterized,
in that the elongated piezoelectric sensors (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) are inclined at an angle (α) to the length direction of the doctor blade (2). Scraper device according to claim 16,
characterized,
that the angle (α)> 0 °, preferably> 45 °, particularly preferably approximately 90 °. Scraper device (1) according to one of claims 1 to 17,
characterized,
in that the individual support region (16.1, 16.2, 16.3) supporting the piezoelectric sensor (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) on the doctor blade (2) and / or or on the individual scraper blade part (2.1 to 2.n, 2.1, 2.2, 2.3, 2.4, 2.5) of the other carrier areas (16.1, 16.2, 16.3) and / or of piezoelectric sensors (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) free areas (17.1, 17.2) is decoupled. Scraper device (1) according to one of claims 1 to 18,
characterized,
that the doctor blade (2) and / or the individual scraper blade part (2.1 to 2.n, 2.1, 2.2, 2.3, 2.4, 2.5) on both sides of a piezoelectric sensor (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) open-edged recesses (15.11, 15.12, 15.21, 15.22, 15.31, 15.32) or incisions. Scraper device (1) according to one of claims 1 to 19,
characterized,
in that the piezoelectric sensors (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) of a scraper blade (2) and / or of a scraper blade part (2.1 to 2.n, 2.1, 2.2 , 2.3, 2.4, 2.5) individually or in groups with a data acquisition and / or evaluation device (20) are coupled. Scraper device (1) according to one of claims 1 to 20,
characterized,
in that the piezoelectric sensors (9, 9.1 to 9.n, 9.1, 9.21, 9.22, 9.31 to 9.3n, 9.41, 9.42, 9.5) of a scraper blade (2) and / or of a scraper blade part (2.1 to 2.n, 2.1, 2.2 , 2.3, 2.4, 2.5) are coupled together with a data acquisition and / or evaluation device (20). Scraper device (1) according to claim 20 or 21,
characterized,
that the coupling is designed as an electrical coupling (18). Scraper device (1) according to claim 22,
characterized,
that the coupling comprises line connections. Scraper device (1) according to claim 22 or 23,
characterized,
that the coupling is wireless. Scraper device (1) according to claim 24,
characterized,
that the coupling is designed as an infrared connection or as a radio connection. Scraper device (1) according to one of claims 21 to 25,
characterized,
that the data acquisition and / or evaluation device (20) by a control and / or regulating device (21) is formed. Scraper device (1) according to one of claims 21 to 26,
characterized,
that the data acquisition and / or evaluation device (20) is formed by a personal computer. A squeegee device comprising a blade for equalizing a medium on a movable surface, a holding device for the blade, means for generating a pressure for positioning the blade relative to the movable surface and means for at least indirectly detecting a contact pressure and / or contact pressure at least a portion of the extension of the blade at least indirectly descriptive size,
characterized,
in that the device for at least indirect detection of a variable which at least indirectly characterizes the contact force and / or the contact pressure comprises at least one piezoelectric sensor. Doctor device according to claim 28,
characterized,
that the means for at least indirect detection of the pressing force and / or the contact pressure at least indirectly characterizing, comprising a plurality of the length of the blade, which corresponds to consider the extent of the blade in the width direction of the movable surface arranged piezoelectric sensors. Doctor device according to claim 28 or 29,
characterized,
in that the piezoelectric sensors of a blade are coupled individually, or in groups or together with a data acquisition and / or evaluation device. Doctor device (1) according to claim 30,
characterized,
that the coupling is an electrical coupling. Doctor device according to claim 30 or 31,
characterized,
that the coupling is wireless. Doctor device according to claim 32,
characterized,
that the coupling is designed as an infrared connection or radio connection. Doctor device according to one of claims 30 to 33,
characterized,
that the data acquisition and / or evaluation device is formed by a control and / or regulating device.

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