DE102010042550A1 - Rotational torque measuring device for measuring torque of drive shaft of clamping apparatus e.g. chain tensioner, has detecting unit for detecting deformation generated during introduction of rotational torque into connection region - Google Patents

Abstract

The torque measuring device (30) has a coupling region (10) for coupling the housing (14) relative to the device, and a coupling region (11) for coupling a transverse shaft (7) relative to the housing, at the time of torque initiation. The coupling regions are coupled to each other via a web-like connecting portion. A measuring region with a measurement port (17) is provided in a connecting region, and a detecting unit (29) is provided for detecting the deformation generated during introduction of rotational torque into the connection region. An independent claim is included for clamping apparatus such as chain tensioner.

Description

The invention relates to a torque-measuring device and a torque-measuring device with it.

The invention further relates to a tensioning device, in particular a chain tensioner, for tensioning a clothing by means of a tensioning roller, which has such a torque-measuring device for measuring a torque of a drive shaft of the tensioning device. The invention relates in a particularly advantageous embodiment, a clamping device, in particular a chain tensioner, for tensioning a fabric in a machine for the production of fibrous webs, paper, cardboard or tissue webs.

The term "clothing" refers to endlessly circulating belts or loops of belts which are guided over at least two, preferably a plurality of rollers and serve to guide and support media or goods transported with them over a predefined distance. In particular, the term "tensioning" also refers to endlessly circulating belts or loops of belts which serve to support and guide pulp suspensions or fibrous webs in machines for producing same. The execution of this, in particular type, structure, composition and dimensioning of the covering takes place depending on the place of use within the respective plant, in particular a machine for producing fibrous webs in the form of paper, board or tissue webs and the function to be fulfilled. Such fabrics can be present in machines for producing fibrous webs as a sieve belt, dryer fabric belt, felt belt or transfer belt.

For the operation of machines for the production of fibrous webs, it is known to set a clothing when mounting on the rollers leading them or for adjusting the string tension during elongation of the fabric during operation by means of tension rollers below a predefined voltage. To set a string tension is used to measure acting forces, for example, a torque arm with a lever which is supported on a spring. The lever is equipped with an angle sensor, so that the force acting on the spring can be deduced from the path or angle and the value of a spring constant of the spring. Also known separately under a guide roller for the clothing arranged measuring supports for measuring the voltage.

To set a string tension is known to mount a tensioner, in particular chain tensioner, with measuring support, that is in particular a bearing support for measuring components, on a clamping carriage, which is movable along a guideway.

However, current designs of such systems have a number of disadvantages. Thus, the clamping force is measured only on one side of the machine. In addition, a large center height is required for the measurement support or the measuring equipment. In particular, it is a very vibration prone system due to greater height and additional bearing clearance. Another disadvantage is the respectively required special adaptation construction for the tension roller bearing. This results in higher manufacturing costs and inadequate suitability for standardization.

Out WO 01/40749 A1 A measuring device with at least one first coupling region for coupling to a first component fixed relative to the measuring device, a second coupling region for coupling to a second component that is movable relative to the first component, and a measuring region between the coupling regions with measuring openings for accommodating in each case a deformation sensor is generally known. In this case, a solid block-shaped block has two mutually spaced Ankoppelbereiche for screwing with two external components. Near its front end portions are two measuring ranges, in each of which a bore for receiving a deformation sensor is formed. In the case of a force acting on the block, which acts through the two coupled components, the structure of the block distorts such that the cylindrical bores deform into oval bores. This deformation is detected by the deformation sensors and provided as a measurement signal. The forces acting on the block, which exist between the two coupled components, can then be determined from the measurement signal. To facilitate the deformability of the block longitudinal slots are inserted through the block in the area between the two measuring ranges.

Another exemplary deformation sensor and a measuring principle are generally known from a company publication "measuring eye with thin film sensor and integrated amplifier", series F9303, tecsis GmbH, D-63073 Offenbach ".

The invention is therefore based on the object, in particular for a string tensioner, such as a wire tensioner in the paper industry, to propose a measuring device or measuring device, which allows a low-cost reliable measurement of at least one Bespannungszug at least indirectly characterizing size. In particular, such a measuring device or measuring device should be suitable for measuring a reaction torque, in particular torque of a shaft of a chain tensioner in the paper industry.

The solution according to the invention is characterized by the features of claims 1, 8, 10 and 11. Advantageous embodiments are described in the subclaims.

A torque measuring device according to the invention comprises at least one first coupling region for coupling to a relatively fixed to the measuring device first component, a second coupling region for coupling to a relative to the first component in the circumferential direction movable second component for introducing a torque in the torque-measuring device, wherein the first and the second coupling region are coupled together via at least one web-like connection region. At least one measuring area with at least one measuring opening is provided in at least one of the connecting areas, to which means for detecting at least one variable that at least indirectly describes the deformation when the torque is introduced into the connecting area can be assigned.

A connection region is understood in particular to be a solid or physical region which extends between the first and the second coupling region and connects the latter without joints.

The torque measuring device according to the invention is functionally connected between a driving component and a component to be driven. The introduction of a torque in the torque-measuring device via a, in particular a second Ankoppelbereich the measuring device. By transferring the moment via the at least one web-like connection region to the measuring device, it is exposed to overlapping shear and bending stresses. The resulting deformation of the measuring opening, which assumes a more or less ovalized shape in the elastic region of the connecting region in a preferably circular formation depending on the load, can be used in a simple manner for at least indirect characterization of the introduced torque. Since the change in shape is directly associated with the introduction of torque, the torque measuring device according to the invention offers the possibility of a particularly rapid detection of it.

In a particularly advantageous embodiment, the first and the second coupling region and the individual web-like connection region are designed as an integral component. The first and the second coupling region are separated from one another by at least one slot-shaped passage opening outside the at least one measuring region. Ideally, the torque measuring device can be manufactured in a single step quickly and cost-effectively by separating with little material waste.

Preferably, therefore, the first and the second coupling region are manufactured or formed together with the at least one connecting region and the measuring region formed by this from a single part. However, as an alternative, subsequent connections of the coupling regions can also take place via one or more such connection regions by soldering, welding or screwing the individual components together. Ultimately, it should be made possible that an adjustment of the two coupling regions relative to one another causes an elastic deformation within the connection region, in particular in the measuring region.

Such a torque measuring device is advantageous if the first and the second coupling region are separated from one another by at least one, in particular, slot-shaped passage opening outside the at least one connecting region. Such a passage opening, which extends between the preferably narrow measuring areas carrying connecting areas, allows a rotational movement of the second Ankoppelbereichs within the first Ankoppelbereichs, without internal adjustment forces are overcome. The acting adjusting moments, in particular a variable which at least indirectly characterizes a torque, which are received by the second coupling area, thereby only lead to a distortion or deformation of the measuring areas and in particular also a deformation of the measuring openings in them.

With regard to the arrangement and / or geometric design of the individual coupling regions, in particular of the surface areas describing them, there are a large number of possibilities. Decisive is the connection via at least one, preferably a plurality of connecting regions, wherein at least one, preferably a plurality of connecting regions each have at least one measuring range, the means for detecting at least one deformation in the measuring range at least indirectly characterizing size are assigned. The fact that the individual Ankoppelbereiche can be carried out relatively freely in terms of their shape and arrangement, there is the possibility of a simple and above all individual adaptation to the measuring environment without impairing the function.

The first and second Ankoppelbereich can be arranged offset in the radial and / or axial direction to each other. As a result, the torque measuring device can be adapted to the measuring range environment, in particular the position of the connection components, simply and individually with regard to the design and arrangement of the coupling regions.

In a particularly space-saving design of the first and the second Ankoppelbereich are offset in the radial direction and arranged in the axial direction in a plane. In an advantageous embodiment, one of the two coupling regions - first or second coupling region - the other coupling region - second or first Ankoppelbereich- executed in the circumferential direction completely enclosing.

In a further embodiment, which can also be combined with the abovementioned, the radially inner coupling region preferably has a passage opening for receiving / passing a component or component, in particular a rotatable component or component. Under the inclusion of a component or a component, in particular a shaft or such a wave equivalent component is in particular a passage to understand it. The inner component is then formed, for example, as at least one segment for receiving a shaft or another rotatable component, in particular the movable second component. This solution offers the advantage of simple and space-saving integration in power flow paths between rotatable components.

In a particularly advantageous embodiment of the previously described space-saving designs of the first and / or the second Ankoppelbereich are plate-shaped.

For connecting the first and / or second component of the torque-measuring device to the driving or aborting component, the first and / or second coupling region has means for positive or non-positive connection.

Autonomously inventive is also a torque-measuring device with a torque measuring device constructed in this way and with at least one deformation sensor in at least one such measuring opening. Not necessary but preferred, two or more such deformation sensors can be used in each case a measuring opening. Finally, advantageously belongs to such a torque-measuring device and a particular electrical connection to a computer device which performs an evaluation of detected by the deformation sensor forces and correspondingly output measurement signals.

A deformation sensor can be used as z. B. strain gauges can be arranged on the measuring range. A deformation sensor is preferably used as a thin-film sensor known per se, which is inserted in a measuring opening, preferably pressed in.

Advantageously, each of the measuring ranges is the same design and equipped with a measuring port to create symmetrical same conditions and to enable universal applicability with customization options for installation on site. However, a deformation sensor does not necessarily have to be used, in particular pressed, in each of such measuring openings.

The solution according to the invention has the advantage that, depending on the arrangement of the measuring ranges and the size of the changing shape, the introduced torque can be determined very accurately and sensitively.

Depending on the assignment and coupling of the individual Ankoppelbereiche the torque measuring device or the torque measuring device to a stationary relative to the measuring device first component and a relative to the first component in the circumferential direction movable second component in a torque transmitting arrangement of driving component or driving Assembly and component to be driven or driven assembly is introduced into this either the torque in a first embodiment of the driving component / assembly or in a second embodiment of a driven component / assembly in the torque measuring device.

In the first embodiment, the second coupling region is coupled to a driving component for this purpose. This is formed either by the directly coupled to the component to be driven component or component, for example, the output of a driving assembly or a coupled thereto and upstream in the power flow component of the driving assembly. The other, in particular first coupling region of the measuring device is then coupled to a preferably stationary component on a component or assembly to be driven. Upon initiation of a torque from the driving to the component to be driven thus also a torque which is equal to or proportional to the torque introduced by the driving to the driven component, of the driving Introduced component and supported on a stationary component on the component to be driven as a reaction torque. In terms of its size, this corresponds to the torque introduced into the component to be driven or is at least directly proportional to it.

Analogously, in a second embodiment, the second coupling region is coupled to a component to be driven. Again, the coupling may be either directly to the component directly connected to the driving component, i. H. take the input of a driven assembly or one of these downstream in the power flow component of the driven unit. The other, in particular first coupling region of the torque-measuring device is then connected to a preferably stationary component on the drive, d. H. coupled to the driving assembly. Upon initiation of a torque from the driving to the driven component of the latter thus also a torque which is equal to or proportional to the torque introduced into the component to be driven, introduced from the driven component in the torque-measuring device and a stationary component on the Drive side, for example, a housing supported.

The torque measuring device according to the invention can be used in a particularly advantageous manner in a tensioning device for clothing. In the first-mentioned embodiment, the first stationary component is, in particular, a housing of a drive of a tensioning device, such as a chain tensioner or a wire tensioner. Preferably, such a chain tensioner a tension roller for tensioning a fabric such as a sieve, felt belt, dryer belt or the like is firmly coupled so that movement of such a sieve or chain tensioner along a guideway causes a corresponding movement of the tension roller and thus a change of a string tension.

The second Ankoppelbereich is used for coupling to a driving component, in particular a shaft, such a shaft is not only the drive shaft of a drive unit to understand, but optionally also a rotatably coupled thereto element, in particular a shaft coupled thereto or a coupled thereto Gear. In principle, planetary gears are to be understood by which are coupled to such a shaft and transmit a force of a shaft rotation, for example, a chain.

Insofar as the term rotation is used, these are to be understood as meaning, in particular, only slight twisting movements of a few degrees or even less than one degree of rotation angle of a chain wheel engaging in a chain for changing a string tension.

The second coupling region can extend all around the shaft or an opening for receiving such a shaft. In principle, however, the embodiment of individual segments as the second coupling region, if such segments can accommodate a wave or equivalent component suitable. The at least one passage opening and / or the second coupling area adjacent thereto radially is in particular formed in the manner of a circle segment at a distance from an insertable shaft. This ensures a particularly uniform torque transmission.

In such a torque-measuring device, the first coupling region in extension to the at least one measuring range at least one fastening means, in particular a mounting hole for attachment to the stationary first component have. Such a torque measuring device is preferred if the at least one measuring region is formed in an elongated connecting region and the first coupling region is guided laterally spaced from one end of the connecting region laterally of the connecting region and laterally spaced from one end of the connecting region and laterally in a region of the first coupling region Connecting region fastening means, in particular fastening bores are formed for fixing to the stationary first component. Such lateral fastening means give a firm hold against torques and prevent a rotation of the first coupling region with respect to the coupled component, in particular a drive housing.

Preferably, the second coupling region is formed between two or more connecting regions having such measuring regions as an at least segment-wise annular shaft receiving opening for receiving the shaft in the sense of passing through. This allows a substantially segmental annular configuration of the second Ankoppelbereichs, which allows a geometrically advantageous undisturbed transmission of torque forces.

The torque-measuring device or its coupling regions are preferably plate-shaped. This allows a simple and space-saving installation and preferably at the same time a non-negligible or falsification of torque transmissions through these components.

If the first coupling region encloses the second coupling region, a high stability and at the same time a good mountability are thereby ensured.

In such a torque measuring device, the second coupling region may optionally have fastening means, in particular fastening bores, for the rotationally fixed coupling of a shaft bearing supporting the shaft or a gear housing coupled to the shaft. Such an arrangement is particularly advantageous if the drive shaft is mounted in its own shaft bearing, which can then be screwed to the second Ankoppelbereich or when the shaft opens into a transmission housing with, for example, a planetary gear, so that the transmission housing connected to the second Ankoppelbereich, in particular can be screwed.

Also inherently inventive is a tensioning device, in particular a chain tensioner, for tensioning a tensioning roller, comprising a measuring device for measuring an acting force, wherein the measuring device for measuring a torque of a driving shaft of the tensioning device is designed as such a torque measuring device. The object is thus in particular a combination of a string tensioner, in particular wire or chain tensioner, with a tensioning roller, which are guided on a tensioning carriage along a guideway, and by means of a drive of the chain tensioner along the guideway are movable to regulate a stringing particular Siebzug to be able to. In addition to the arrangement of such a torque-measuring device on one side of a drive roller or guide track, a separate such torque-measuring device can also be arranged on each side of such a drive roller or guide track.

Advantageously, result from such embodiments facilities in which a total string tension, so both sides of a tension roller, can be measured simultaneously. In this case, any change in clamping force can be detected. In particular, one-sided, that is, the leader side or drive side rising sieving forces can be detected, which, for example, in a fault condition or winder of a paper strip, for. B. when the strip by a drying section, or in shifted or poorly aligned rollers can arise.

In particular, a construction of a standard tension wagon for mounting low standard supports or pillow blocks is also possible, so that no special construction of bearings or support or bearing support is required. This enables a compact and vibration-resistant construction.

A cost-effective overall solution is made possible, in particular also by easy standardizability for different torque ranges, in particular machine widths, and by specifying connecting range widths, in particular web widths in the measuring plate, which is formed by the coupling regions with the preferably several measuring ranges as webs. In particular, an adjustment is made possible when the service life is prolonged as the service life progresses.

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

1 illustrates in schematic simplified representation based on a view of a paper machine, a preferred torque-measuring device on a chain tensioner;

2a illustrates a top view of the torque measuring device of the torque measuring device 1 without sensor elements inserted therein;

2 B clarifies the torque measuring device 2 in perspective view with an inserted sensor element;

3 illustrates in a view from the right a torque measuring device according to the invention in a drive arrangement of a chain tensioner;

4 illustrates a schematic diagram of such a clamping system, wherein a plan is sketched on a tension roller;

5a and 5b show different arrangements of the drive of a tensioning device.

The 1 illustrates in schematic highly simplified representation of the basic structure and the basic function of an inventively designed torque measuring device 30 comprising a torque measuring device 1 with this associated means 29 for detecting a variable that at least indirectly characterizes the deformation in an advantageous application in a paper machine, in particular for at least indirect detection of the clothing 21 acting and by a jig 2 Generable clamping force. The torque measuring device 1 is doing a jig 2 , such as B. a chain tensioner, assigned between a drive unit 22 and the tensioning device 2 arranged and at a housing of the clamping device 2 attached. The tensioning device 2 is on a cocking cart 3 arranged, on which also one by means of the tensioning device 2 to exciting or to be adjusted tension roller 4 is stored. At the tension roller 4 For example, it may be a separately provided roller or guide roller. The tensioning car 3 is in a guideway 5 guided and along the guideway 5 traversable. By means of a broken line are possible end positions of the tensioning roller 4 represented with ( 4 ) are designated. The guideway 5 extends in installation position in the paper machine viewed in the longitudinal direction of this, ie in the machine direction. The guideway 5 is arranged and / or stored on a leader or driving side stiffening part of the paper machine. Preferably, both sides of a tension roller 4 such tensioning devices 2 arranged.

In the guideway 5 is a chain 6 guided. The length of the chain 6 is longer than the extension of the guideway 5 in the direction of movement of the tensioning carriage 3 and thus longer than a length of the guideway 5 , This can make the chain 6 from a plane passing through the course of the guideway 5 and a perpendicular to it in the horizontal direction is characterized, in the vertical direction upwards and to a drive wheel 8th be guided, the chain 6 with the drive wheel 8th engaged. The drive wheel 8th is directly or indirectly with a wave 7 , in particular transverse shaft, of the tensioning device 2 connected so that the tensioning device 2 by driving the shaft 7 in a rotational movement over the shaft 7 the drive wheel 8th can rotate. The chain 6 is from the guideway 5 starting, preferably, a first on the tensioning carriage 3 stored deflecting wheel, in particular sprocket, up to the drive wheel 8th guided and a distance from the drive wheel 8th passing around a second deflecting wheel, in particular sprocket 9 so the chain 6 only in an area below the drive wheel 8th out of the guideway 5 led out.

The drive unit 22 includes a prime mover 23 , For transmission / reduction and / or change in direction during torque transmission is a transmission 25 comprising, for example, a planetary gear and optionally provided an angle drive whose output 24 at least indirectly rotationally fixed, preferably directly with the shaft 7 connected is.

A drive torque aM, which of the clamping device 2 over the wave 7 and the drive wheel 8th transmitted, thus acts directly on the chain 6 , Due to the fixed attachment of the clamping device 2 and a bearing of the tension roller 4 on the tensioning car 3 causes such a drive torque aM rotation of the drive wheel 8th within the at both ends of the guideway 5 clamped chain 6 , on the opposing force of a horizontal adjustment of the shaft 7 and above the jig 2 , the tension wagon 3 and the tension roller 4 along the guideway 5 , As a result, the drive torque aM is in a preferably directly proportional relationship to a string tension, for example Siebzug sz, which of the tension roller 4 on a guided by this stringing 21 , For example, in the form of a screen belt acts. Characterized in that the drive torque aM a chain hoist kz on the chain 6 exercises and the chain 6 firmly on the guideway 5 is clamped, the counterforce of the chain hoist kz ideally the entire drive torque aM is used to generate the string tension, in particular Siebzug sz. The drive torque aM is via the drive unit 22 applied.

The 2a shows a view from the on a preferred torque measuring device 1 like these in 1 can be used. The 2 B illustrates the torque measuring device 30 in perspective view, which from the torque measuring device 1 according to 2a and the deformation sensors 18 is formed. In this embodiment, the first and second Ankoppelbereich 10 . 11 offset from one another in the radial direction and free from offset in the axial direction. The torque measuring device 1 is preferably plate-shaped. The first coupling area 10 encloses the second coupling area 11 completely in the circumferential direction. First and second coupling area 10 . 11 are over at least one connection area 26 , here by way of example four web-like connection areas 26 coupled together. The connection areas 26 In the example shown, they are preferably in the circumferential direction with respect to the second coupling region 11 arranged evenly distributed.

The torque measuring device 1 is designed as an integral component. This is the second coupling area 11 over a majority, preferably its almost entire outer circumference completely from the first coupling area 10 separated. The separation takes place with the formation of slot-shaped passage openings 20 in the circumferential direction around the outer periphery of the second Ankoppelbereiches 11 are executed extending over a partial area.

In at least one, preferably all connection areas 26 for connecting the second coupling area 11 with the first coupling area 10 is in each case at least one measuring range 12 intended. The measuring ranges 12 are formed in the web-like connecting portions connecting areas 26 between an outer periphery of the second coupling region 11 and an inner periphery of the first coupling portion 10 formed radially extending. The measuring ranges 12 are in one plane of the extension of the torque-measuring device 1 in the circumferential direction or in a plane transverse to this penetrating shaft 7 formed so broad that in the measuring ranges 12 in each case at least one measuring opening 17 can be introduced, which for receiving a known deformation sensor 18 represented in 2 B , suitable is.

The first coupling area 10 , has a - preferably but not necessary - square shape. The second coupling area 11 enclosing inner contour 27 is preferably to the outer contour 31 of the second coupling area 11 adapted, in the illustrated case circular with the exception of the connection areas 26 , The in the radial direction within the first Ankoppelbereichs 10 arranged second coupling area 11 is preferably annular. A free circular interior of the second coupling area 11 , which from a passage opening 28 is formed here is adjusted in terms of its inner circumference so that the interior of the shaft 7 or one with the wave 7 receive coupled rotating element in the sense of passing can.

With a view to reducing a size of the torque measuring device 30 it is beneficial to the measuring ranges 12 in an area of the corners of the first coupling area 10 to arrange, since in particular in a square configuration in this area in the first coupling region 10 a lot of space is available. At the same time, the width of the slot-shaped passage opening 20 be kept narrow. This is made possible by the fact that in the corner areas of the first coupling area 10 and the second docking area 11 facing substantially rectangular or square recesses are formed, which the web-like connecting portions 26 form and within which the measuring ranges 12 remain running in the radial direction. The measuring ranges 12 are characterized in the circumferential direction of the second Ankoppelbereichs 11 through radial slots or lateral spacing openings 19 from the first coupling area 10 separated.

For fixing the first coupling area 10 on a fixed component, here the output side, ie on the component to be driven, in particular a flange of a housing 13 the tensioning device 2 as the stationary component are in the first coupling region 10 Fastening means, in particular fastening bores 15 . 16 educated. Particularly advantageous is the arrangement of a respective mounting hole 15 in the radial direction to the measuring areas 12 and an arrangement of two further mounting holes 16 Seen in the circumferential direction right and left of the measuring ranges 12 laterally surrounding lateral spacing openings 19 ,

Preferably, also in the second coupling region 11 Fastening means, in particular fastening bores 14 be formed, which penetrate this axially parallel and for attachment, in particular screw on a flange, not shown here, the drive side, in the circumferential direction relative to the first stationary component rotatable second component, for example a planetary gear serve.

2 B shows the torque measuring device 1 out 2a in a perspective view. It is also in one of the measuring openings 17 a known deformation sensor 18 as a means 29 used, which is also shown enlarged. Of course you can also in one or more of the other measurement openings 17 in the other measuring ranges 12 such deformation sensors 18 be used to serve as redundant components or for averaging purposes of the signals provided by these. Particularly advantageous is the use of thin-film sensors as or in such deformation sensors 18 ,

When the drive torque aM on the second coupling area 11 acts, this causes an adjustment, in particular a twisting movement or rotational movement of the second Ankoppelbereichs 11 opposite the fixed or non-rotating first coupling region 10 , This causes deformation in the joint areas 26 arranged measuring ranges 12 so that the measuring openings then arranged 17 be distorted from a preferably circular shape into an oval shape. The deformation causes a deformation force on one in the measuring opening 17 used such deformation sensor 18 so that it can provide a corresponding force signal in accordance with the deformation force acting on it, from which a control device, not shown in the drawing, determines corresponding forces.

3 clarified in a view across the track 5 the arrangement of the torque measuring device 30 with torque measuring device 1 and deformation sensors 18 formed means 29 between drive unit 22 and tensioning device 2 , The torque measuring device 1 is here as an intermediate plate between the drive unit 22 , in particular a drive machine 23 with planetary gear 25 and the unit to be driven in the form of the clamping device 2 arranged. The first coupling area 10 is with a stationary component, here a housing 13 or Housing part of the driven unit, in particular the housing of the clamping device 2 connected. The second, in the circumferential direction movable coupling area relative to the first Ankoppelbereich 11 is with the driving gear 25 , in particular at least indirectly with the drive shaft 7 coupled output 24 connected. The compound can be designed in various ways and is basically with regard to the arrangement in the power flow in the transmission 25 freely selectable. This is about the output 24 of the transmission 25 the wave 7 driven. The coupling of the second coupling region preferably takes place 11 at this. The connection between the shaft 7 and the exit 24 of the transmission 25 takes place in the illustrated case via a positive shaft / hub connection. Here are the shaft in the example shown 7 and the as output 24 of the transmission 25 acting drive hub of the transmission 25 each stored separately. The in the drive unit 22 mounted drive hub advantageously has a radial clearance, so that the axis of rotation R of the shaft 7 with the gear centering in the second coupling area 11 is overdetermined.

The function of the torque measuring device 1 also consists in the attachment of the transmission, in particular the holding of the own weight and the support in the direction of rotation when the torque occurs.

4 schematically shows a plan view of a shaft 7 that of a tensioning device 2 is powered by a torque measuring device 1 Is provided. In particular, it is also possible, but not mandatory, on the opposite side of the shaft 7 to use another such torque-measuring device. About chains 6 on both sides of the guideways an adjustment of the shaft 7 and about a horizontal adjustment of the adjustable together with the clamping carriage tension roller 4 , It is advantageous that in such an arrangement, a clamping force change .DELTA.Fs, which drive side on the tension roller 4 acting and to the opposite side of the tension roller 4 decreases, and can be fully recorded.

On the example provided Siebspannerkonstruktion according to 1 are chains 6 as tension chains over such sprockets 9 and drive wheels 8th coupled to the transverse shaft. In this case, the Siebspannkraft or Siebzug sz behaves proportionally to the transverse shaft as the shaft 7 introduced torque or drive torque aM. The drive torque aM required for driving the wire tensioner is based on the reaction torque at the flange of the driving gear to the housing of the unit to be driven, that is to say the tensioning car 3 off with the transverse shaft bearing. This separation point between the drive unit and the housing of the abortreibenden unit, in particular a felt tensioner, is used to a space-saving and well standardizable measuring plate in the form of the torque-measuring device 1 with the means 29 forming the torque measuring device 30 to determine the pending torque or reaction torque.

The preferred measuring plate in the form of the torque measuring device 1 works in that the preferably square torque-measuring device an inner annular zone with preferably centering and mounting holes 14 for receiving the drive unit, z. B. a planetary gear, and with preferably at least two connecting areas formed by webs 26 connected outer attachment zone in the form of the first Ankoppelbereichs 10 for attachment to the unit to be driven, z. B. the tensioning carriage 3 on the screen tensioner has.

By the transmission of the reaction torque over the webs or measuring ranges 12 from the inner to the outer zone, that is, the second and first Ankoppelbereich 11 . 10 , results in a superimposed bending and shearing stress especially in the middle of the middle of the measuring ranges 12 arranged measuring opening 17 or measuring bore, which occupies a more or less ovalized shape in the elastic region of the component depending on the load. In this measuring opening 17 Preferably, a thin film sensor is pressed, which emits a signal corresponding to the change in shape corresponding to a control of the drive, which controls a constant maintenance of the Siebspannkraft.

A thin-film sensor or deformation sensor 18 is a low-cost, commercially available standard purchase part with, for example, about 20 mm in diameter and can be supplied in redundant design, which provides security. Optionally it is possible to fit into any bar bore or measuring opening 17 to install a simple sensor. The torque measuring plate or torque measuring device 1 can be used in principle as a transition flange for various drives or integrated into these.

The 5a and 5b show in schematic highly simplified representation possible arrangements of the drive unit 22 the tensioning device 2 , According to 5a If the arrangement is analogous to in 1 shown execution on the clamping carriage 3 , The chain 6 is here on both sides of the train 5 clamped, in particular on a frame part 33 the leader or drive side. Preferably, in each case on both sides of a tension roller in the cross-machine direction such tensioning devices 2 arranged, ie both the leader as well as drive side of a machine for producing a material web.

In contrast, shows 5b an embodiment of the clamping device 2 with arrangement of the drive unit 22 outside the tensioning wagon 3 , in particular fixed to a frame part 33 the leader or drive side. The chain 6 is guided looped here, wherein the end portions of mutually away sides of the tensioning carriage 3 are articulated. The chain is to the two-sided ends of the web 5 led deflecting, with the drive unit on one side 22 coupled to the deflection or forms with, for example by the function of the deflection of the drive wheel 8th is performed. Preferably, on both sides of a guide roll in the cross-machine direction such tensioning devices 2 arranged, ie both on the leader and drive side of a machine for producing a material web.

LIST OF REFERENCE NUMBERS

1

Torque measuring device

2

Clamping device, in particular chain tensioner, with housing as the first component to be coupled

3

tensioning carriage

4

tension roller

5

train

6

Chain

7

Shaft, in particular transverse shaft, as the second component to be coupled

8th

Drive wheel to shaft

9

Deflection wheels, in particular sprockets

10

first coupling area

11

second coupling area

12

measuring range

13

casing

14

Fastening means, in particular fastening bores

15

Fastening means, in particular fastening bores

16

Fastening means, in particular fastening bores

17

measurement opening

18

deformation sensor

19

lateral spacing opening

20

slotted passage opening

21

covering

22

drive unit

23

prime mover

24

output

25

transmission

26

connecting area

27

inner contour

28

Through opening

29

Means for detecting a deformation at least indirectly characterizing size

30

Torque measuring device

31

outer contour

32

flange

33

frame part

at the

drive torque

concentration camp

chain

sz

wire draw

ΔFs

total clamping force change

QUOTES INCLUDE IN THE DESCRIPTION

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Cited patent literature

• WO 01/40749 A1 [0007]

Claims (13)

Torque measuring device ( 1 ) with at least one first coupling region ( 10 ) for coupling to a relative to the measuring device ( 1 ) stationary first component, with a second coupling region ( 11 ) for coupling to a relative to the first component in the circumferential direction movable second component for introducing the torque in the torque measuring device ( 1 ), wherein the first and the second coupling region ( 10 . 11 ) via at least one web-like connection region ( 26 ) are coupled together, and with at least one, in at least one of the connection areas ( 26 ) measuring range ( 12 ) with at least one measuring opening ( 17 ), the funds ( 29 ) are assigned to detect at least one of the deformation at least indirectly descriptive size. Torque measuring device ( 1 ) according to claim 1, characterized in that the first and the second coupling region ( 10 . 11 ) and the single web-like connection area ( 26 ) are designed as an integral component and the first and the second coupling region ( 10 . 11 ) outside the at least one measuring range ( 12 ) by at least one slot-shaped passage opening ( 20 ) are separated from each other. Torque measuring device ( 1 ) according to one of claims 1 or 2, characterized in that the first and the second coupling region ( 10 . 11 ) are arranged offset in the radial and / or axial direction to each other. Torque measuring device ( 1 ) according to one of claims 1 to 3, characterized in that the one of the two Ankoppelbereiche - first or second Ankoppelbereich ( 10 . 11 ) - the other coupling region - second or first coupling region ( 11 . 10 ) - Completely enclosing in the circumferential direction. Torque measuring device ( 1 ) according to one of claims 3 or 4, characterized in that the first and the second coupling region ( 10 . 11 ) are arranged in the axial direction in a plane and the respective inner coupling region ( 10 . 11 ) a passage opening ( 28 ) for receiving / passing a component, in particular as a segment for receiving a rotatable component is executed. Torque measuring device ( 1 ) according to one of claims 1 to 5, characterized in that the first and / or the second coupling region ( 10 . 11 ) is plate-shaped. Torque measuring device ( 1 ) according to one of claims 1 to 6, characterized in that the first and / or second coupling region ( 10 ) Comprises means for positive or non-positive connection with the respective first or second component. Torque measuring device ( 30 ) with a torque measuring device ( 1 ) according to one of claims 1 to 7 and with at least one deformation sensor ( 18 ) in at least one such measuring opening ( 17 ). Torque measuring device ( 30 ) according to claim 8, characterized in that the deformation sensor ( 18 ) is designed as a thin film sensor. Use of a torque measuring device ( 30 ) according to claim 8 or 9 for safety shutdown at impermissibly high torques. Clamping device ( 2 ), in particular chain tensioners, for tensioning a tensioning roller ( 4 ), comprising a measuring device for measuring an acting force (ΔFs), characterized in that the measuring device for measuring a torque of a driving shaft ( 7 ) of the tensioning device ( 2 ) as a torque measuring device ( 30 ) is formed according to claim 8 or 9. Clamping device ( 2 ) according to claim 11, characterized in that the torque measuring device ( 30 ) is arranged such that a first coupling region ( 10 ) for coupling to a relative to the torque measuring device ( 30 ) fixed first component of a stationary component on the clamping device ( 2 ) is formed and the second coupling area ( 11 ) for coupling to a relative to the first component in the circumferential direction movable second component for introducing the torque in the torque measuring device ( 30 ) with a rotatable component of a drive unit ( 22 ) of the tensioning device ( 2 ) can be coupled. Clamping device ( 2 ) according to claim 11, characterized in that the torque measuring device ( 30 ) is arranged such that a first coupling region ( 10 ) for coupling to a relative to the torque measuring device ( 30 ) fixed first component of a stationary component of a drive unit ( 22 ) of the tensioning device ( 2 ) is formed and the second coupling area ( 11 ) for coupling to a relative to the first component in the circumferential direction movable second component for introducing the torque in the torque measuring device ( 30 ) with a rotatable component with the drive unit ( 22 ) coupled component of the tensioning device ( 2 ) can be coupled.

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