EP2553414A2

EP2553414A2 - Web or strip tension measuring apparatus, use of such a web or strip tension measuring apparatus and method for determining the web tension

Info

Publication number: EP2553414A2
Application number: EP11709043A
Authority: EP
Inventors: Frank Schmidt; Ansgar MÜLLER; Peter Kahl; Martin Müller
Original assignee: Voith Patent GmbH
Current assignee: Voith Patent GmbH
Priority date: 2010-03-31
Filing date: 2011-03-03
Publication date: 2013-02-06
Also published as: DE102010003504A1; WO2011120753A3; CN102918372A; WO2011120753A2

Abstract

The invention relates to a web or strip tension measuring apparatus (1) comprising a force pick-up arrangement (2) with at least two components (4, 5), which pick up force, are arranged at a distance from one another and are coupled to one another via at least two webs (6, 7, 8, 9) and a central web (10), and a measuring device (3) which is arranged on the central web (10). The invention is characterized in that the webs (6, 7, 8, 9) are designed such that the latter are suitable for picking up and transmitting compressive forces, and the measuring device (3) comprises at least one sensor (12) which is arranged on the central web (11) and is oriented in such a manner that shearing forces acting on the force pick-up arrangement (2) in the installation position of the web or strip tension measuring apparatus (1) can be detected.

Description

Web or strip gauge, use of such web or strip gauge, and method of determining web tension

The invention relates to a web or Streifenzugmessvomchtung and the

Use of such a web or strip measuring device, comprising a force transducer arrangement with at least two mutually spaced force-absorbing components, which are coupled to each other via at least two webs and a central web, and at least one arranged on the central web measuring device. The invention further relates to a method for determining the web tension of a web or strip.

Under a path in the context of the invention, a finite or infinite planar structure is understood, whose extent in the longitudinal and transverse directions is substantially greater than in the height direction. These include material webs, in particular in the form of plastic webs or fibrous webs,

for example in the form of paper, board or tissue webs. Furthermore, such webs are also functional webs, in particular for the transport and / or the support of media and / or goods understood. such

Functional tracks can be clothing. Fabrics are endlessly circulating belts or loops of belts which are guided over at least two, preferably a plurality of rollers or deflection rollers and the guidance and support of these with a predefined distance

serve transported media or goods. Serve in machines for producing webs, in particular paper, cardboard or tissue webs

Covering the support and guidance of a pulp suspension or fibrous web. The execution, in particular type, structure, composition and dimensioning of the clothing takes place depending on the location within the respective plant and the function to be fulfilled. such

Coverings can be present in machines for the production of fibrous webs as a sieve belt, dryer fabric belt, felt belt. Strips describe partial paths, which are disproportionately low

Extension in the transverse direction relative to the extension in the longitudinal direction are characterized.

To determine train trains are statically determined and static

indeterminate measuring systems known. To determine the train of clothing in machines for the production of fibrous webs are exemplary

Force load cells used, which are acted upon between two plates and a rotary joint with a part of the tensile force of the respective fabric. The rocker thus formed is used in particular in forming units for determining the Siebzuges.

This measuring principle is used in a modified form as an integrated measuring method in a felt tensioner of a press section. The measurement is carried out on a basement felt not as a pressure, but as Zugmessung, but this is only possible by means of a bias by disc springs, since the used

Load cell can only measure pressure forces. A major disadvantage of such embodiments is the use of the rotary joint and in the

Application in press sections additionally in the required preload through the disc springs. The swivel is characterized by a high susceptibility to

Vibrations characterized and also costly. Also are to

Determining the tensile forces acting on the clothing a large number of mating surfaces and their exact production required. Nevertheless, you can

Settling phenomena additionally influence the measured value. Since the measurement at the basement felt is not based on pressure and load, but on pressure and relief, it must be taken into account that in the output signal is inverted, otherwise instead of the voltage increase a voltage decrease is displayed, although the felt tension increases. Furthermore, in clamping devices integrated measurements on

Torque arms and spring units known. Such designs are relatively complex and the individual spring units must be for each

Voltage measurement are designed. In addition, a distance measurement is required because the wrap angle changes greatly by the long travel of the tensioner.

In contrast to these statically determined measuring systems, however, a large number of indefinite measuring systems is also known. From the document DE 25 52 576 a force measuring device for measuring transverse forces with a pair in the direction of force mutually displaceable force-absorbing components is previously known, between which a measuring device with at least one pair arranged on both sides of the measuring device, connecting webs forming membranes is arranged. The membranes are arranged and designed such that they are able to yield slightly in the direction of the transverse force. The measuring device is arranged between the membranes and firmly connected to the force-absorbing components. The measuring device includes

Arrangements for displaying the shear stresses that occur at this in the mutual displacement of the force-absorbing components. The

Measuring device further comprises two windings, one of which generates a magnetic flux in the measuring device and the other the

Detects change in this magnetic flux, which occurs in the mutual displacement of the force-absorbing parts, wherein the one winding is arranged in a plane parallel to the displacement direction and the other winding in a plane perpendicular thereto.

In contrast, the document EP 05 01 351 B1 discloses an embodiment of two yokes which likewise form webs via webs and a measuring device in the middle region. Such devices are characterized by high elasticity and low rigidity in the region of the measuring point, since the membranes are only suitable to absorb tensile forces under load. Furthermore, the increased elasticity also causes the detection of forces in the longitudinal direction, which inter alia by the

Attachment of the force-absorbing components with the connection elements are conditional. These are to be eliminated by additional measures.

General are also for the determination of tensile / compressive loads and

Shear Loads Thin film sensors are known, which are exemplified in the

Operating instructions of the Tecsis GmbH: "F9393 / F93C3 - press-fit sensor with integrated amplifier", 2007 are described. These are in the

stressed component pressed.

The invention is based on the object, an external measurement of a

Railway train, in particular a stringed train or a

Material web train in a machine for producing webs, in particular paper machine to allow, which should be characterized by a high rigidity of the measuring point itself and also works free of a required bias of the measuring system. The solution according to the invention is intended by a low design and manufacturing effort

be characterized.

The solution according to the invention is characterized by the features of claims 1, 10, 13 and 14. Advantageous embodiments are described in the subclaims.

A web or strip tension measuring device according to the invention, comprising a force transducer arrangement with at least two spaced from each other

arranged force-receiving components, which are coupled to each other via at least two webs and a central web, and arranged on the central web measuring device, characterized in that the webs are designed such that they are adapted to receive and transmit compressive forces and the measuring device comprises at least one sensor which is arranged and aligned on the central web such that in the installation position of the web or

Streifenzugmessvorrichtung acting on the load cell assembly

Shearing forces are detectable.

As sensors, thin-film sensors are used in a particularly advantageous embodiment. Under thin-film sensors are known in a known manner sensors whose production is carried out in the thin-film process. These comprise a support on which different layers for resistors and compensators are applied, in particular pressure-sensitive

Resistive layers, magnetoresistive layers, piezoelectric layers and the like. These are applied to the carrier by means of thin-film methods, for example by vapor deposition or sputtering, and can optionally be combined with appropriate amplifier electronics and / or display devices to form a structural unit.

The solution according to the invention makes it possible to ensure an external measuring point with high rigidity and without biasing within the entire measuring system. Due to its good temperature behavior and high long-term stability, thin-film sensors are characterized by high availability. Another advantage is the small footprint with a large possible measurement range, so that the train or

Strip measuring device can be constructed relatively compact overall. In an advantageous embodiment, the mutually arranged

force-absorbing components preferably arranged parallel to each other. The individual webs are preferably, but not necessarily so

arranged that the force transducer assembly is symmetrical with respect to three planes and the planes of symmetry are characterized by the axes laid on the central web. The sensor, in particular thin-film sensor is advantageously arranged at the intersection of the planes of symmetry on or in the central web. As a result, the arrangement is moved to an area where the occurring shearing loads have the most impact, so that a particularly sensitive measurement is possible.

In an alternative embodiment, the force-absorbing components are arranged at an angle to each other and the webs extend with respect to at least one force-absorbing component at an angle to this. This embodiment can be used in a particularly advantageous manner in mountingotuations, which is characterized by the angular arrangement between the bearing assembly and reference plane, in particular frame.

The measuring plane of the thin-film sensor is in a refinement preferably at an angle in the range of 30 to 60 degrees, particularly preferably 45 degrees to a plane which is writable by an axis in the longitudinal direction of the force transducer assembly and an axis perpendicular to this. As a result, when vertical introduction of compressive or tensile forces in the force transducer arrangement, these have no effect on the measurement result, so that with the inventive arrangement a determined by the resulting tensile shearing force at least indirectly characterizing size is determined very accurately without external influences.

To form a pressure and tensile force on the

Force transducer assembly perpendicular to the longitudinal direction rigid measuring arrangement, the force transducer assembly can be formed in a first embodiment as an integral component. This can for example consist of a

metallic material or alloys, in particular steel or

be made of fiber-reinforced plastics, for example in the form of a

Cast parts, wherein the webs are produced in a first variant by the shaping of the primary molding, in particular casting. This embodiment is particularly advantageous since manufacturing technology can be realized in a single operation in a simple and time-saving manner. In a second variant, the webs and the force-absorbing components are formed from a semifinished product by cutting, in particular milling, etc. The first embodiment is particularly suitable for small measuring points, under which the arrangement region of the web or strip tension measuring device is understood.

In an alternative embodiment, at least one of the force-absorbing components and the individual webs and / or the central web are designed as separate components, which are non-positively, positively or materially connected. This allows the individual components of the

Force transducer assembly are made simple and resource-friendly and the force transducer assembly can be produced in the required manner by joining with high variety of variants.

To avoid the direct effect of pressure and / or tensile forces on the measuring device, the force-absorbing components to their

Connection environment directed side in the longitudinal direction of

Force transducer arrangement considers an over the arrangement region of the central web in the longitudinal and transverse directions on both sides extending, preferably up to the webs to the adjacent webs extending exemption. This exemption can be understood in integral training with the load cell assembly as a recess or local material removal. However, the release can also be formed by means of separate elements, such as plates or pads, which are arranged between the force-absorbing components and the connection elements. The release thus formed is designed such that the characterized by this region of the force-absorbing components is suitable, in installation position free of contact with the

To be connecting elements of the force-absorbing components. As a result, the initiation and transmission of tensile and / or compressive forces on the force-absorbing components only in the web areas, which is provided in the longitudinal direction of the force transducer assembly respectively in the end regions.

The coupling of the measuring device to the central web can be realized in various ways. In a particularly advantageous embodiment, it is provided that the central web comprises a receptacle for the measuring device and the measuring device is connected to the central web via a press fit. The measuring device then comprises a press-fit sensor which can be pre-produced in large quantities as a standardized component and which can be easily assembled and replaced as required.

In an alternative embodiment, the measuring device is connected cohesively to the central web. This design is particularly easy to implement in terms of assembly.

An inventive method for determining the web tension of a guided on a web-guiding element web with a train or

Streifenzugmessvorrichtung according to any one of claims 1 to 10, characterized in that the web or Streifenzugmessvorrichtung is so associated with the web-guiding member and aligned that with the

Measuring device can be detected on at least one of these acting shear force at least indirectly characterizing size and on the on

web-guiding component acting tensile force is determined as a function of this.

In this case, a physical or electrical variable characterizing the shearing force, which results from the change in geometry in the arrangement region of the

Measuring device is used to determine the tensile force occurring on the web used.

In a further development, the tension as a function of

Bahnfläche be determined. When aligning the resulting tensile force acting on the web in

Direction of the resulting weight of the web-guiding part shear forces to detect the web or Streifenzugmessvomchtung is oriented relative to the vertical position to the resulting weight inclined and the influence of then still acting in this direction weight as a tare of the web or strip traction device from the with the measuring device ascertainable size by disregarding excluded. Thereby, a modified measurement result for the occurring shear stresses can be formed with high accuracy without distortion.

The solution according to the invention, in particular railway or

Streifenzugmessvomchtung and the inventive method can both for determining the web tension of a web or web of material strip, in particular a paper board or tissue web directly as well as formed by a fabric web in the form of a wire belt, felt or

Trockensiebbandes be used.

The solution according to the invention is explained below with reference to figures. The following is shown in detail:

FIGS. 1 a and 1 b show a web or web according to the invention

Stripper device in two views;

Figure 1 c shows in a detail the arrangement of the measuring plane;

FIG. 2 a shows an arrangement of the web or web according to the invention

Strip drawing device to a web-guiding component;

Figure 2b illustrates the introduction of force at the force transducer assembly

Execution without exemption;

Figure 3a shows an embodiment of a force transducer assembly with release; FIG. 3b shows a detail X according to FIG. 3a:

Figure 3c shows the introduction of force line to the load cell assembly in execution with exemption; Figures 4a and 4b illustrate arrangement positions of the web or

Streifenzugmessvornchtung against a web-guiding component; Figure 4c shows an alternative to Figure 4b training the train or

Streifenzugmessvornchtung;

FIGS. 5a to 5c show different embodiments of the invention

Kraftaufnehmeranordnungen;

FIG. 6 shows, on the basis of a signal flow diagram, a method for determining the

Bahn train. FIG. 1 illustrates, in a schematized and highly simplified representation, the basic structure of an inventive web or web

Streifenzugmessvornchtung 1 for statically indeterminate measurement of the resulting tensile force F _Zr it on a web or a strip at least indirectly characterizing size. The web or strip measuring device 1 comprises a force transducer arrangement 2 and at least one measuring device 3 arranged thereon. The force transducer arrangement 2 comprises two force-absorbing components 4 and 5 which are arranged parallel to one another and which

are preferably formed in the form of plate-shaped elements and which are arranged parallel to each other at a distance. One of the force-absorbing components 4 or 5 is assigned in the functional position of a force-introducing device and the other of the force-absorbing components 5 or 4 of a force-absorbing base. Shown is the web or strip measuring device 1 in a position as this corresponds to an idealized installation position. To clarify the individual directions is a coordinate system to the railway or

Streifenzugmessvorrichtung 1 is applied, wherein the X-direction corresponds to the longitudinal direction of the Kraftaufnehmeranordnung 2, in which when a web tension is a component of the force acting on the web or the strip tensile force is aligned. The Y-direction describes the extent in the transverse direction to the longitudinal direction and in the installed position, the transverse direction to the acting tensile force. The Z direction describes the height direction. The load cell assembly 2 is constructed and configured to be movable with respect to that through the

Coordinate system writable levels, ie the XY, YZ and XZ plane is formed symmetrically, wherein the coordinate system is placed in the intersection of these planes of symmetry.

The two force-absorbing components 4 and 5 are arranged spaced apart in the Z direction. The force-absorbing components 4 and 5 are in the region of their longitudinal end portions 20.1, 21 .1 and 20.2, 21 .2 over at least two webs 6 and 7, in the illustrated case in a particularly advantageous embodiment via a pair of webs in the longitudinal direction to each other

spaced apart webs 6 and 8 and 7 and 9 connected together. The webs 6, 7, 8, 9 are executed in a particularly advantageous embodiment perpendicular to the force-absorbing components 4, 5 and suitable to transmit compressive forces. In the area of the intersection of the symmetry planes of the

Force transducer assembly 2, a further web in the form of a central web 10 between the two force-absorbing components 4, 5 is provided, which receives the measuring device 3. The individual webs 6, 7, 8, 9, 10 are arranged and designed such that the symmetry of the force transducer 2 is ensured with respect to the individual said symmetry planes. The individual web 6, 7, 8, 9, 10 can in each case be made in one piece, that is, in an integral construction with one or both force-absorbing components 4 and 5. In an alternative embodiment, this can also be releasably or permanently connected to the force-absorbing components 4, 5. The measuring device 3 receiving central web 10 is in the longitudinal direction of

Force transducer assembly 2 arranged in the center region. The arrangement of the measuring device 3 on the central web 10 is carried out such that the center of the measuring device 3 in the unloaded state at the intersection of the individual

Symmetrieebenen the load cell assembly 2 sits. The measuring device 3 is arranged and designed such that it is suitable only

To measure shear stresses. For this purpose, the measuring plane 22 is designed and arranged inclined at an angle, preferably at an angle of 45 degrees to the XY plane. This is illustrated by a detail from FIG. 1 a in FIG. 1 c. Visible are the different measuring planes 22 ^' and 22, the angle γ ^' 22 and 722 is aligned with the sensor plane of the sensor and the reference planes.

With this arrangement it is achieved that the tensile / compressive deformations are not perceived on the Kraftaufnehnneranordnung 2 in the XZ plane and in the YZ plane of the measuring device 3.

The measuring device 3 is designed in the form of a measuring body, which is received in a receptacle 1 1 in the central web 10, which is formed by a cylindrical bore, and connected to the central web 10. The connection is preferably made by traction, in particular by pressing or material bond, in particular welding or gluing. According to the invention, the measuring device 3 comprises at least one thin-film sensor 12. This can be designed as a standardized prefabricated component. The thin film sensor 12 comprises at least one carrier 13 on which the most different layers for resistors and compensators are applied. These are atomically interconnected. With regard to the execution of such thin-film sensors, there are a large number of possibilities. In this regard will be on known

Referred to from the prior art. By way of example, the Tecsis GmbH Operating Instructions: "F9393 / F93C3 - Press-Fit Sensor with Integrated Amplifier", 2007 are examples. In this exemplified embodiment, a Wheatstone bridge with the necessary resistances for adjustment and temperature compensation, in particular compensation resistances on a support 13 in the form of a sensor body, which is present for example in the form of a pot-like body applied. The Wheatstone bridge works here as a transmitter with by the

Occurrence of shear stress on the force transducer assembly 2 conditional deformation influenceable resistors. This one comes with the optional

Electronics and optionally a display device in the receptacle 1 1 introduced on the central web 10 and the measuring plane 22 in

Scherkraftwirkungsbereich arranged. The measuring device 3 in this case comprises a total of a cylindrical outer contour 14. The receptacle 1 1 is designed such that it forms a press connection with the measuring device 3 when trained as Einpresssensor. When a tensile force occurs, the load cell assembly 2 becomes a

Subjected to shear stress, which leads to a deformation. Is this done?

Arrangement of the receptacle 1 1 with the measuring device 3 in the deformed by shear area, carried out under load an ovalization of the receptacle 1 1, wherein the measuring device located in this 3, in particular the

Thin film sensor 12 also deformed. The size of the ovalization describes at least indirectly the shear stress on the

Kraftaufnehmeranordnung 2 triggering train, the at least indirectly in the web or the storage of the respective web leading part

Streifenzugmessvorrichtung 1 is initiated. This variable, which is usually directly describing the deformation, is converted into a voltage signal. The greater the force component in the longitudinal direction of the web or

Streifenzugmessvorrichtung 1, the greater the voltage signal. From this, the tensile forces acting on the web or the strip can be derived via the known relationships.

With knowledge of the entry and exit angle of the web or the strip on the respective web-guiding part, the tensile force can be calculated in a simple manner. With knowledge of the cross-sectional area of the guided around the web-guiding member web, the tensile stress of the web or of the strip can be determined due to the known functional relationships between these sizes.

FIG. 1 b illustrates the web or strip measuring device 1 in a view onto the YZ plane.

FIG. 2a illustrates an arrangement of the web or strip tension measuring device 1 according to the invention in its assignment to a web-guiding one Component. This is an example of a deflection roller or roller 15, which is mounted in a bearing assembly 16 on a frame 17. The

Guide roller 15 serves to guide a web in the form of a covering 23. In an ideal embodiment, the arrangement of the web tension measuring device 1 is carried out below the bearing assembly 16, wherein the arrangement can be made directly or via other transmitting components. The bearing assembly 16 acts as a force-introducing device. The web or strip measuring device 1 can be arranged in the measuring environment such that no pure tensile and compressive forces are measured. It can be seen that the guidance of the covering 23, on which the web tension is to be determined, takes place around the deflection roller 15, that here the resultant of the resultant tension F _Zr acting on the clothing does not pass directly through the center of the deflection roller 15 and thus does not coincide with the resulting weight force of the guide roller 15, so that tensile and compressive deformations in the XZ plane can be neglected.

The force-absorbing member 4 of the force transducer assembly 2 is at least indirectly coupled to the bearing assembly 16 in the form of the pillow block, while the force-absorbing member 5 on the frame 17 as the

supporting force-absorbing base. The shear stress triggering force acting on the force-absorbing member 4 in the longitudinal direction is shown by arrow and designated F _L. The triggering tensile force on the

Covering 23 is designated F _Zr es. In the installation position shown, the force transducer assembly 2 is arranged such that its longitudinal direction at least with a directional component with the longitudinal direction of the machine for guiding the fabric 23rd

coincides. When running this as a machine for making a

Material web, in particular fibrous web corresponds to this direction of

Machine direction. If the web or strip tension measuring device 1 in FIG. 2 is designed according to FIG. 1, FIG. 2b illustrates the power flow due to the weight force acting through the deflecting roller 15 via the force transducer arrangement 2. A uniform pressure load Fp can be seen here over the entire length

Extension of the force transducer assembly 2 in the longitudinal direction. The weight force acts perpendicular to the force-absorbing component 4. This is realized in particular by the surface contact of the force-introducing device directed side 4.1 of the force-absorbing component 4 with the pillow block. The support of the bearing assembly 16 via almost, preferably the entire surface formed by the page 4.1 of the force-absorbing component 4. In analogy, the introduction of the compressive force Fp to the force-absorbing base in the form of the frame 17 is uniform over the entire contact area. In this case, the measuring device 3 is acted upon by this pressure force, so that the measurement result can be falsified. Therefore, according to a particularly advantageous

Development provided in Figure 3a, in the field of the arrangement of

Central web 10 on both sides of the force-introducing device in installation position facing side 4.1 of the force-absorbing member 4 and the force-absorbing base side facing 5.1 of the force-absorbing component 5 an exemption, i. an area which in functional position or installation position free from contact with the force-introducing or

force-taking basis is to create. For this purpose, an exemption 18, 19 is provided, which allows the force-absorbing component 4 on the side 4.1 in the region of the arrangement of the central web 10 and thus the

Measuring device 3 free from direct contact with the force-introducing

Device or the force-absorbing component 5 on the side 5.1 in the region of the arrangement of the central web 10 is free of direct contact with the force-absorbing base and the initiation of the force of gravity of the guide roller 15 related compressive forces Fp1 .1, Fp1 .2 outside this in the areas characterized by exemptions 18 and 19, with the

Measuring device 3 is free from the influence of these compressive forces Fp1 .1, Fp1 .2. The

Exemptions 18, 19 extend in the longitudinal direction preferably up to the force-transmitting and the central web 10 adjacent webs 8, 9 and in Transverse direction preferably completely over the surface formed by the respective side 4.1, 5.1. The pressure forces Fp1 .1, Fp1 .2 are indicated by arrows. These are introduced into the force-absorbing component 4 and forwarded via the webs 6, 7, 8, 9 to the force-absorbing component 5 and from this in the force-absorbing base on the remaining in the web areas

Contact surface with the base on the side 5.1 initiated.

FIG. 3c clarifies the flow of force, which is now recognizable only via the webs 6, 7, 8 and 9. Preferably, this extends the

Exemption 18, 19 up to the two sides of the force-absorbing components 4 and 5 in the axial direction in the outer sides connecting webs.

The individual exemption 18, 19 is characterized by a localized removal of material from the surface of page 4.1 or 5.1. This can be designed as a recess. The size of this release 18, 19 is viewed in the Z direction in the range of 0.1 to 10 mm, preferably in the range of 0.5 to 2 mm.

Figure 3b illustrates in a detail X in a section of the

force-absorbing component 4 exemplifies the exemption 18th

FIG. 4a shows an arrangement of a web or web according to the invention

Streifenzugmessvorrichtung 1 in an unfavorable mounting position, in which the resultant F _Zr es of the train F _{z of} the fabric 23 in the direction of

Resulting of the weight F _{G of} a guide roller 15 and thus causes only tensile and compressive forces in the load cell 2. The force in the longitudinal direction F _L on the force transducer assembly 2, ie the force in the direction of the x-axis, thus becomes 0. This position is due to the arrangement of

Force transducer assembly 2, in particular of the force-absorbing components 4, 5 with their contact surfaces forming pages 4.1, 5.1 perpendicular to the direction of action of the resulting tensile force Fzres characterized. To avoid this and to detect shear forces, therefore, the force transducer assembly 2 according to Figure 4b inclined to the base plane arranged at an angle ß. In this arrangement, a component of the weight force F _{G of} the deflection roller 15 acts on the measuring device 3. This must be excluded in an oblique and vertical installation as TARA, since this produces a component of the weight force in the X direction, that is to say in the longitudinal direction of the web tension measuring device 1, which leads to a falsification of the result. The measuring range must be corrected by this force component and its effect, ie the tare of the guide roller 15. In order not to exceed the maximum measuring range of the sensor, the measuring range or the center bar 10

voluminous be executed, as in horizontal mounting position. FIG. 4b illustrates this installation situation with tilted force transducer arrangement 2. In contrast, FIG. 4c shows an alternative embodiment of a

Force transducer assembly 2 to 4b, in which the horizontal

Terminal level is maintained on a frame by the force-absorbing components 4, 5 are arranged at an angle to each other and the webs 6, 7, 8, 9 are aligned at an angle relative to this.

FIGS. 5a to 5c illustrate exemplary embodiments of the web tension measuring device 1 for measuring ranges of different sizes. In this case, the figure 5a exemplifies an embodiment as they are for small

Measuring ranges can be used. In this case, the

Force transducer assembly 2, which consists of a stable construction,

in particular a metal construction, preferably be designed as an integral component, in which the respective webs are worked out by separating. These may be, for example, a solid sheet metal plate or a cast or sintered construction. In contrast, Figure 5b illustrates an embodiment in which the individual components of the Kraftaufnehmeranordnung 2, in particular the force-absorbing components 4 and 5 and the webs 6 to 10 are preferably formed of separate components, which are coupled to each other via connections with the respective force-absorbing components. The connection between the individual webs 6 to 10 and the force-absorbing components 4, 5 preferably takes place cohesively, in particular by welding.

FIG. 5 c shows an asymmetrical embodiment of a

Force transducer assembly 2 with different number of webs on both sides of the central web 10th

The execution of the measuring device 3 receiving central web 10 in shape is in terms of its length, that is extension in the longitudinal direction of the web or strip tension measuring device and / or width, that is transverse to adapt to this so that the maximum allowable ovalization for the sensor 12 and the Recording 1 1 is not exceeded. If the ovalization is too large, the measuring range of the measuring device 3 would be exceeded. The strain in the direction of the measuring plane of the central web 10 in the loaded state is preferably in the range of 0.1 1/1000 to 0.25 1/1000.

In addition to the insertion of the measuring device 3 in the central web 10 in the receptacle 1 1, it is also conceivable to weld the measuring device 3 directly to the central web 10, wherein this is designed in this case as a thin sheet metal component.

FIG. 6 illustrates, by way of example, the detection of the web tension on the basis of a signal flow image. In a first method step VA takes place due to the triggering event web train deformation at the

Force transducer assembly 2, which causes a deformation of the measuring device 3 in VB, from which in VC a signal for a train at least indirectly characterizing the train is generated size generated. From this, the resulting tensile force FZres at the railway in VD can be determined via functional relationships e.t.c. The determination can already be integrated in the sensor

Electronics or separate evaluation, which are usually components of controls / regulations for setting the train. LIST OF REFERENCE NUMBERS

1 web tension measuring device

2 load cell arrangement

3 measuring device

4 force-absorbing component

4.1 page to the force introduction device side

5 force-absorbing component

5.1 to the force-absorbing base turned page

6 footbridge

7 footbridge

8 footbridge

9 footbridge

10 median bridge

1 1 recording

12 thin film sensor

13 carriers, in particular platelets

14 outer contour

15 pulley

16 bearing arrangement

17 frame

18 time off

19 exemption

20.1, 20.2 end region of the force-absorbing component 4

21 .1, 21 .2 end region of the force-absorbing component 5

22 measuring level

23 stringing

X, Y, Z coordinates

ß angle

γ ^'22, Y22 angle

Fzres resulting tensile force acting on the web F _L force in the longitudinal direction of the load cell assembly

F _G weight

F _z tensile force of the clothing

VA-VD process steps

Claims

Patent claims

Web or strip tension measuring device (1), comprising a

Force transducer arrangement (2) with at least two force-absorbing components (4, 5) arranged at a distance from one another, which are coupled to one another via at least two webs (6, 7, 8, 9) and a central web (10), and one arranged on the central web (10). Measuring device (3),

characterized,

in that the webs (6, 7, 8, 9) are designed such that they are suitable for absorbing and transmitting compressive forces and the measuring device (3) comprises at least one sensor (12), which is arranged in this way on the central web (1 1) and is aligned so that in the installation position of the railway or

Strip tension measuring device (1) on the force transducer arrangement

(2) acting shear forces can be detected.

Web or strip tension measuring device (1) according to claim 1,

characterized,

that the force-absorbing components (4,5) arranged in relation to one another are parallel.

3. Web or strip tension measuring device (1) according to claim 1 or 2,

characterized,

that the individual webs (6, 7, 8, 9) are arranged in such a way that the

Force transducer arrangement (2) is symmetrical with respect to three planes and the planes of symmetry are characterized by the axes located on the central web (10).

4. Web or strip tension measuring device (1) according to one of claims 1 to 3, characterized,

that the sensor (12) is a thin film sensor.

Web or strip tension measuring device (1) according to one of claims 1 to 4,

characterized,

in that the sensor (12) is arranged at the intersection of the planes of symmetry and the measuring plane (22) of the thin film sensor (12) is at an angle in the range of 30 to 60 degrees, preferably 45 degrees to a plane which is defined by an axis in the longitudinal direction of the force transducer arrangement ( 2) and an axis perpendicular to this can be written in the transverse direction,

is aligned.

6. Web or strip tension measuring device (1) according to one of claims 1 to 5,

characterized,

that the force transducer arrangement (2) is designed as an integral component.

7. Web or strip tension measuring device (1) according to one of claims 1 to 6,

characterized,

that at least one of the force-absorbing components (4, 5) and the individual webs (6, 7, 8, 9) and / or the central web (1 1) as separate

Components are designed that are connected to one another in a force-fitting, form-fitting or material-locking manner.

8. Web or strip tension measuring device (1) according to one of claims 1 to 7,

characterized,

that the force-absorbing components (4, 5) on their

The sides (4.1, 5.1) facing the connection environment in the longitudinal direction of the force transducer arrangement (2) are viewed one above the other Arrangement area of the central web (10) which extends on both sides in the longitudinal and transverse directions, preferably extending up to the webs (8, 9) adjacent to the central web (10), and which is integrally formed thereon (18, 19) or by separate elements, in particular plates or documents have an exemption (18, 19), which is designed in such a way that the area characterized by this

force-absorbing components (4, 5) is suitable to be free of contact with the connecting elements of the force-absorbing components (4, 5) in the installed position.

9. Web or strip tension measuring device (1) according to one of claims 1 to 8,

characterized,

that the central web (10) comprises a receptacle (1 1) for the measuring device (3), in particular a cylindrical receptacle, and the measuring device

(3) is connected to the center web (10) via a press fit.

10. Web or strip tension measuring device (1) according to one of claims 1 to 9,

characterized,

that the measuring device (3) is cohesively connected to the central web (10).

1 1 . Method for determining the web tension of a web or strip guided on a web-guiding element with a web or

Strip tension measuring device (1) according to one of claims 1 to 7, characterized in

that the web or strip tension measuring device (1) is used in this way

web-guiding component (15) is arranged and aligned so that at least one shear force acting on it can be detected with the measuring device (3) and which at least indirectly characterizes it and which on the The resulting tensile force (F _Zr es) acting on the web-guiding component (15) is determined as a function of this.

12. The method according to claim 1 1,

characterized,

that when the resulting tensile force (F _Zr es) acting on the web or strip is aligned in the direction of the resulting weight of the web-guiding component (15), the web or

Strip tension measuring device (1) is aligned at an angle (ß) relative to the vertical position to the resulting weight force and the influence of the weight force component acting in the longitudinal direction is calculated as TARE of the web or strip tension measuring device (1) from the size that can be detected with the measuring device (3). .

Use of a web or strip tension measuring device (1) according to one of claims 1 to 10 for determining the web tension of a material web or material web strip, in particular a paper, cardboard or tissue web.

Use of a web or strip tension measuring device (1) according to one of claims 1 to 10 for determining the web tension of a web formed by a covering (23) in the form of a sieve belt, felt belt or dryer wire belt.