FI120728B - Method and arrangement for adjusting the nip force - Google Patents

Description

FIELD OF THE INVENTION The invention relates to a method and arrangement for adjusting the nip force between a machine roll and a winding cylinder. The invention also relates to a winding device.

Background of the Invention

Figure 1 illustrates a principle view of a winding device in which paper or other roll material 101 is wound around a winding axis 102. In the case of paper machines 10, said winding shaft is called a reel roll, and the assembly formed by the reel roll and the material wrapped around it is called machine roll 104. The reel arrangement has a reeling cylinder 103 which can be moved vertically. Said vertical direction is the y direction of the coordinate system 110. The material to be rolled passes between the winding cylinder and the machine roll 104. The winding cylinder 101 is pressed against 15 machine rolls by a power generating member 105, which typically has a hydraulic cylinder and piston. The winding cylinder 103 is subjected to a torque M1 and the winding shaft 102 is subjected to a torque M2. M2 torque generating device:. often referred to as hub operations. The radial component Fn of the force acting between the winding cylinder 103 and the machine roll 104 is called the nip force, which is often expressed as a force per unit roll width (N / m). Other winding forces include the torque M2 acting on the surface of the machine roll 104 104, the tangential circumferential force and the tangential α caused by the torque M1 applied by the winding cylinder to the material to be rolled 101.

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Said tangential forces affect the tensile strength of the material to be rolled 101. By adjusting the nip force Fn, the hardness of the machine roll 104 formed is sought to be kept within the desired range.

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In a prior art solution, the magnitude of the vertical component Fy of the force applied to the winding cylinder 103 and the magnitude of the nip force Fn * "*: are adjusted by adjusting the magnitude of said vertical force component Fy. · ': 30. Said vertical force component Fy For example, the force sensors attached to the bearing housings of the winding cylinder, which may be, for example, pin or ring sensors. up to 20000 kg, the gravitational force exerted on the winding cylinder being in the order of 200 kN. Thus, the nip force is only a fraction of said vertical force component Fy. In addition to said gravity, said vertical force component is eys and circumferential force, and gravity exerted on the power take-off shaft coupled to the winding cylinder. Mainly because of the gravity applied to the winding cylinder, the measuring range of the force sensors has to be dimensioned so large that the adjustment range of the vertical force component Fy is often only a few percent of the measuring range of the force sensors. This makes it difficult to adjust the nip force Fn, especially at low nip force values, since the large relative change in nip force corresponds to only a very small relative change in the vertical force component Fy.

In one prior art solution, the compression pressure is measured directly from the nip, i.e. the compression area between the winding cylinder and the machine roll. However, the Raidai-15 requires a special roller cylinder with integrated pressure sensors.

Summary of the Invention

The present invention relates to a novel method for adjusting the nip force between a winding cylinder and a machine roll in a winding device, wherein said winding cylinder is:. 20 arranged to be movable in an adjusting direction perpendicular to the axis of said winding cylinder and deviating from a horizontal direction perpendicular to the gravity, and having a power generating device for pressing said winding cylinder against said machine roll in said adjusting direction. In the method according to the invention: · «« ♦ *** ***; having a direction different from said direction of adjustment, and adjusting the magnitude of the force produced by said power generating apparatus by the difference e = Fnx_ref - Fx, where Fx is the value of said horizontal force component of F-30 and Fnx_ref is the horizontal direction of said nip force. target value of a component substantially perpendicular to gravity: ** i relative to the ground.

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The invention also relates to a novel arrangement for adjusting the nip force between a winding cylinder and a machine roll in a winding device, wherein said winding cylinder 3 is arranged movable in a direction perpendicular to the axis of said winding cylinder and deviating from against the machine roll in said adjustment direction. The arrangement according to the invention comprises: - a force transducer apparatus arranged to determine a horizontal force component acting on said winding cylinder which is substantially perpendicular to gravity and in a direction deviating from said adjustment direction, and 10 - an adjustment unit arranged to adjust the power output of said power unit. based on the difference e = Fnx_ref - Fx, where Fx is the value of said horizontal force component and Fnx_ref is the target value of said horizontal component of the nip force which is substantially perpendicular to gravity.

Said force transducer apparatus may include a force transducer having a force measuring direction substantially perpendicular to gravity. Alternatively, said force transducer apparatus may include a multidirectional force transducer arranged to measure forces acting in at least two different directions. Any direction of force measurement of said multidirectional force transducer:. 20 may be selected perpendicular to gravity or the force component X perpendicular to gravity may be calculated based on forces measured in non-directional directions.

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The invention also relates to a new type of winding device having: t · • «• * ·] ... t - a winding cylinder arranged to be movable in an adjusting direction *** perpendicular to the axis of said winding cylinder and deviating in weight. , from a horizontal direction perpendicular to the force, • i · • · * • ·: '** · - a power generating device arranged to squeeze said winding cylinder · »#. *. the blade against the machine reel in said direction of adjustment, • * · • * · • "**: - a force transducer apparatus arranged to determine a horizontal force component acting on said winding X: 30 cylinders substantially • · · #XJ perpendicular to gravity, and having a direction different from said direction of adjustment, and 4 - an adjusting unit arranged to adjust the magnitude of the force produced by said power generating apparatus based on a difference e = Fnx__ref - Fx, where Fx is the value of said horizontal force component and Fnx_ref is the horizontal , target value.

In the method, arrangement and roller device of the invention, it is utilized that the force component perpendicular to the force of gravity is not affected by the gravity applied to the winding cylinder and the transmission shaft or motor connected thereto. In the method, arrangement and rul-law apparatus of the invention, gravity does not substantially complicate the adjustment of the nip force, since the nip force is controlled by the value of a force component substantially perpendicular to the gravity.

The horizontal force component acting on the winding cylinder, which is substantially perpendicular to gravity, can also be used to determine the value of nip force. An estimate of the nip force value can be computed based on the value of said horizontal force component, since the angle between the nip force and said horizontal force component is known from the roll geometry of the device.

Various embodiments of the invention are characterized by what is set forth in the dependent claims.

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BRIEF DESCRIPTION OF THE DRAWINGS Embodiments of the Invention and Their Benefits will now be described in detail with reference to the accompanying drawings, in which: ·· '··· ** Figure 1 shows a side view of a known Fig. 2 shows a side view of a reel assembly having an arrangement for adjusting the nip force between the machine roll and the reel cylinder in accordance with an embodiment of the invention, ···. Fig. 3 shows a side view of a winding device having an arrangement according to an embodiment of the invention, adjusting the nip force between the machine roll and the winding cylinder;

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4 illustrates a bobbin winder according to one embodiment of the invention, and FIG. 5 shows a flow diagram of a method for adjusting the nip force between a machine roll and a winding cylinder according to one embodiment of the invention.

Figure 1 is described previously in connection with the prior art description herein.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION Fig. 2 is a side view of a winding device having a stiffening arrangement according to an embodiment of the invention for adjusting the nip force Fn between the machine roll 204 and the winding cylinder 203. The winding cylinder 203 is arranged to be movable in an adjusting direction perpendicular to the axis of the winding cylinder and deviating from a horizontal direction perpendicular to the gravity 10. In the roller device shown in Figure 2, said adjustment direction is substantially vertical, i.e. parallel (= parallel or opposite) to gravity. In the situation shown in Figure 2, said horizontal direction is parallel to the x-axis of the coordinate system 210 and the gravity is opposite to the y-axis of said coordinate system. The winding device includes a power generating device 205 for pressing the winding cylinder 203 against the machine reel 204 in said adjustment direction. The power generating apparatus 205 is coupled to the bearing housing 221 of the winding cylinder. The corresponding power generating apparatus is also coupled to the bearing housing at the opposite end of the winding cylinder 203. The power generating apparatus may have, for example, an actuator formed by a hydraulic cylinder and piston. An arrangement for adjusting the nip force · · · V V Fn comprises a force transducer apparatus 206 configured to determine a ** ** horizontal force component Fx acting on the winding cylinder 203 which is substantially perpendicular to gravity. The corresponding force transducer apparatus * *] ··· * is also preferably located at the opposite end of the winding cylinder 203. The arrangement also includes: * "25 also an adjusting unit 208 arranged to adjust the magnitude of the force produced by the power generating device 205 · * · based on the determined horizontal force component Fx. The adjusting unit 208 is preferably arranged to control the power generating means at different ends of the '**. horizontal force components defined by force transducer equipment ·.

In an arrangement according to an embodiment of the invention, a force transducer apparatus. 206 is a force transducer whose force measurement direction is substantially perpendicular to the pressure.

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In an arrangement according to an embodiment of the invention, the force transducer apparatus 206 is a force transducer arranged to measure the force components Fx and Fy acting in two different directions, and the other force measurement direction is substantially perpendicular to the force of gravity. Said force-5 sensor may be, for example, a Vishay-Nobel HTU sensor (Vishay Nobel AB). Measurement of the vertical force Fy can be utilized in such reel arrangements where the winding shaft (tambour roller) 202 is introduced at an initial step of winding along the x-axis over the winding cylinder 203.

In an arrangement according to an embodiment of the invention, the adjusting unit 208 is arranged to adjust the magnitude of the force exerted by the power generating apparatus 205 based on the difference e = Fnx_ref-Fx (1), where Fnx_ref is the horizontal component Fnx of nip force The target value Fnx_ref of the horizontal component of the nip force 15 can be determined from the target value of the nip force Fn_ref and the angle γ as follows: Fnx_ref = Fn_ref * cozy.

An arrangement according to an embodiment of the invention has a calculating unit arranged to compute an estimate of the actual value of the nip force Fn Fn_est. . Fn_est = based on Fx / cozy.

In an arrangement according to an embodiment of the invention, the control unit 208 is arranged to control the magnitude of the power produced by the power generating apparatus 205. erosize * · ··· ··! ** e = Fnx ref- (Fx + Frx) (2), where Fnx_ref is the target value of the horizontal component Fnx 25 of the nip force Fn and Frx is an estimate of the horizontal orientation of the winding cylinder 203. .M, for the force component caused by the web tension *, '* of the roll material 201 and the circumferential force on the surface of the machine roll 204. In the calculation of e, Frx must be understood as a sign. Said circumferential force depends on the torque M2 applied to the winding shaft * "·: 202 and the radius of the machine roll 204. The component Frx of the force X; 30 can be determined from said circumferential force, path tension, angle of coverage a and angle y. The ratio of the horizontal component Frx to the vertical component of said force depends on the circumferential force, the track tension and the angles γ and a. The horizontal component Frx is often so small that it is possible to obtain sufficiently high nip force Fn control, even Often, high quality control of the nip force Fn can be achieved even if the force component Frx 5 is completely ignored.

An arrangement according to an embodiment of the invention has a calculating unit arranged to compute an estimate of the actual value of the nip force Fn based on the equation Fn_est = (Fx + Frx) / cosy, where Frx is to be understood as a sign.

In an arrangement according to an embodiment of the invention, the control unit 208 is arranged to adjust the magnitude of the force produced by the power generating device 205 by PID control based on the proportional, integrative, derivative equation (1) or (2) or otherwise. For example, the force produced by the power generating system 205 may be of the form F = F0 + P χ e + I χ i edt 15 + D * de / dt, where P, I and D are the parameters of the PID control, Fo and the derivation and integration of the difference variable e is performed with respect to time t.

Figure 3 is a side elevational view of a winding device having an arrangement of nip force between the machine roll 304 and the winding cylinder 303 according to an embodiment of the invention:. 20 to adjust Fn. The winding cylinder 303 is arranged to be movable in the adjusting direction, "X, which is the direction of the y-axis of the coordinate system 310. The winding device has a power generating device.

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a t 30 assembly for pressing the winding cylinder 303 against the machine reel 304 in said adjusting direction. An arrangement for adjusting the nip force Fn comprises a force • ·]; ·· * sensor apparatus 306, 307 arranged to define a horizontal force component Fx running on the winding cylinder 303 • *: | * 25. The arrangement also includes a control unit 308 which is arranged to adjust the magnitude of the force produced by the power generating apparatus 305 by a basic: Y value of the determined horizontal force component Fx. The force transducer apparatus has a first force transducer 306 having a force: ***: measuring direction substantially perpendicular to gravity, which is: 30, to measure said horizontal force component Fx. The force transducer apparatus has a second force transducer 307 having a force measurement direction substantially parallel to the force of gravity and arranged to measure the vertical force component Fy. The force transducer 307 may be a pin sensor located in the hydraulic piston loop ·: ···, such as a Vishay-Nobel KISD6 sensor (Vishay 35 Nobel AB). The force transducer 307 may also be a loop transducer located in the loop of the hydraulic piston. The force sensor 306 may also be a loop sensor. Measurement of the vertical 8 force Fy can be utilized in reel arrangements in which the reel axis (tambour roller) 302 is introduced at an initial stage of the reel along the x-axis of the coordinate system 310 over the reel cylinder 303. By using separate force sensors 306 and 307 for measuring the directional power components Fx and Fy 5, there is the advantage that the measuring ranges of the different force sensors 306 and 307 can be independently selected. The force transducer 307 preferably has a wider measuring range than the force transducer 306 because the gravity applied to the winding cylinder and its drive shaft is present in the vertical force component Fy.

Figure 4 is a side view of a roller device 10 according to an embodiment of the invention having an arrangement for adjusting the nip force Fn between the machine roll 404 and the winding cylinder 403. The winding cylinder 403 is arranged to be movable in an adjusting direction perpendicular to the axis of the winding cylinder and deviating from a horizontal direction perpendicular to gravity. Said direction of adjustment is in the direction of line 411 and said horizontal direction is in the direction of x 410 of the coordinate system. The winder comprises a power generating device 405 for pressing the winder cylinder 403 against the machine winder 404 in said adjusting direction 411. The winder comprises a force transducer device arranged to define a horizontal force component Fx acting substantially perpendicular to the winder cylinder 403. Said force transducer apparatus comprises a force 20 transducer 406 arranged to measure the force components F1 and F2 acting in two different directions, and a calculation unit 409 arranged to calculate said horizontal force component Fx on the basis of the measured force components F1 and F2. The horizontal force component Fx · * · v · 'can be calculated since the magnitude and direction of the resultant F of the measured force components F1 and F2 are known from the magnitudes and directions of the measured force components F1 and F2. The reel unit has a control unit 408 arranged: ***. adjust the magnitude of the force exerted by the power generating apparatus 405 based on the value of Fx determined by the ··· * horizontal force component.

Fig. 5 is a flow chart illustrating a method of adjusting a nip force Fn between a winding cylinder and a machine roll in a reel assembly according to an embodiment of the invention, wherein said winding cylinder is movable in an adjusting direction perpendicular to said winding cylinder in a horizontal direction, and having a power * * '*: production apparatus for pressing said winding cylinder against said machine roll in said adjusting direction. Step 501 determines a horizontal force component Fx acting on said winding cylinder which is substantially perpendicular to gravity and in a direction different from said direction of adjustment, step 502 adjusts the magnitude of the force exerted by said power generating apparatus based on the value of said horizontal force component Fx.

In a method according to an embodiment of the invention, said adjusting direction is substantially vertical, i.e. parallel to gravity.

In a method according to an embodiment of the invention, said horizontal force component Fx is determined by measuring said horizontal force component Fx with a force transducer having a force measurement direction substantially perpendicular to gravity.

In a method according to an embodiment of the invention, said horizontal force component Fx is determined by measuring said horizontal force component Fx with a force transducer apparatus arranged to measure force components acting in two different directions and having a second force measurement direction substantially perpendicular to gravity.

In a method according to an embodiment of the invention, said horizontal force component Fx is computed based on the values of two force components measured by said force transducer apparatus arranged to measure in two different, directional force components.

The power of said method according to an embodiment of the invention is ♦ · ». · * · *; the magnitude of the force exerted by the output apparatus is adjusted based on the difference e = Fnx_ref -. ·· *, Fx, where Fnx_ref is the target value of said horizontal component of the nip force substantially perpendicular to gravity.

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In a method according to an embodiment of the invention, the estimate of the actual value of the nip-power Fn Fn_est is calculated based on the equation Fn_est = Fx / cosy. The angle γ: Y. * is shown in Figure 2.

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* "In a method according to an embodiment of the invention, the magnitude of the force produced by said force-Y ·· output apparatus is adjusted by the difference e = Fnx_ref - *: ··: (Fx + Frx), where Fnx_ref is the horizontal component of said nip force. substantially perpendicular to gravity, the target value · · · and Frx is an estimate of the horizontal force component applied to said winding cylinder caused by the web tension of the material being rolled and the circumferential force on the surface of said machine roll substantially perpendicular to gravity.

In a method according to one embodiment of the invention, the estimate of the actual value of the nip force Fn is calculated based on the equation Fn_est = (Fx + Frx) / cosy.

As will be apparent to a person skilled in the art, the invention and its embodiments are not limited to the exemplary embodiments described above, but the invention and its embodiments may be modified within the scope of the independent claim. The expressions describing the existence of the features contained in the claims, for example "arrangement of force sensors", are open so that the presentation of the features 10 does not exclude the existence of other features not set forth in the independent or dependent claims.

• • • • • • • • • • • • • • • •• I: * 1 · · 1 ·:: ·· ♦ «· • · • ♦ m ·« · * · • · · · # · · # • • · · 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 * 1 · 1 #

Claims (14)

A method for regulating the pinch force between a reel cylinder and a machine reel in a wheelchair assembly, wherein said reel cylinder is movably arranged in the control direction which is perpendicular to said axis of said reel cylinder and deviates from the horizontal direction in the horizontal direction which is in the horizontal direction. gravity, and comprising a force generating plant for pressing said reel cylinder against said machine roller in said control direction, characterized in that in the method: - (501) a horizontal force component acting on said reel cylinder is defined, which is a reel cylinder. perpendicular to the ratio of gravity and: whose direction deviates from said control direction, and ·· * * · · *. \ Y - (502) is the magnitude of the power generated by said power generating plant • * [; ·· 'force based on the magnitude difference e = Fnx ref - Fx, where Fx is the value • · • ** for said horizontal force component and Fnx ref is the set point for said ·… · horizontal nip power component, which is substantially perpendicular to the ratio of gravity. • · • · • · · · · · !. Method according to claim 1, characterized in that said direction of regulation is substantially parallel to gravity. · · · · · · · · Method according to Claim 1, characterized in that said horizontal force component is defined by measuring said horizontal force component with a: ** in force sensor, whose direction of measurement is substantially perpendicular to gravity. * ♦ ··· • · Method according to claim 1, characterized in that said perpendicular power component is defined by measuring said perpendicular power component with a force sensor system, which is arranged to measure the power components operating in two mutually deviating directions and one of which the force measurement direction is substantially at an angle to each other. gravity. 5. A method according to claim 1, characterized in that said road-straightening power component is defined calculated on the basis of values for two power components, said two power components being measured with a power sensor system arranged to measure the power components operating in two directions from each other. Method according to claim 1, characterized in that the magnitude of the force generated by said power generating plant is regulated on the basis of the magnitude e - Frx - Fnx_ref - (Fx + Frx), where Fx is the value of said horizontal straightening component, Fnx_ref is the setpoint of said horizontal straight nip force component which is substantially perpendicular in relation to gravity, and Frx is an estimate of the horizontal straight component directed to said roll-up cylinder which is produced by a web tension in the material to be rolled and a peripheral force which rises to the ground which is substantially perpendicular in the relation to gravity. An arrangement for regulating the pinch force between a reel cylinder (203, 303, 403) and the machine reel (204, 304, 404) in a wheelchair assembly, said reel cylinder being movably arranged in the direction of regulation which is perpendicular to the front: *. Inclined to the axis of said reel cylinder and deviates from the horizontal direction. . ·. one which is perpendicular in relation to gravity, and which includes a power generating plant (205, 305, 405) for pressing said reel cylinder against said machine roller in said control direction, characterized in that the arrangement "m" comprises: • · • 25. a force sensor system (206, 306, 307, 406) arranged to define the horizontal force component which acts on said reel cylinder, which is substantially perpendicular in relation to gravity and whose direction deviates. ·· *. from a control direction, and • a control unit (208, 308, 408) arranged to control the magnitude of the force generated by said power generation plant on the basis of the difference magnitude e, ·. = Fnx ref - Fx, where Fx is the value of the said horizontal power component and • · · * · * | Fnx ref is the setpoint for said road-right nip power component, which is substantially perpendicular in relation to gravity. Arrangement according to claim 7, characterized in that said direction of regulation is substantially parallel to gravity. Arrangement according to claim 7, characterized in that said force sensor system is a force sensor (206, 306), whose direction of measurement is substantially perpendicular to gravity. Arrangement according to claim 7, characterized in that said force sensor system comprises a first force sensor (306), whose force measurement direction is substantially perpendicular in relation to gravity and which is arranged to measure said horizontal force component, and a second force sensor (30). the direction of force measurement is substantially parallel to gravity. Arrangement according to claim 7, characterized in that said force sensor system is a force sensor (206) arranged to measure force components operating in two different directions and one of the direction of measurement is substantially perpendicular to the relative direction. Arrangement according to claim 7, characterized in that said force sensor system comprises a force sensor (406) arranged to measure the force components operating in two different directions, and a calculation unit (409) arranged to calculate said force component on the basis of values for the force, components measured with said force sensor. • · * • · t • * · ·! 20 Arrangement according to claim 7, characterized in that said control unit: *: * · is arranged to control the magnitude of the force generated by said power generation. system based on the magnitude e - Frx = Fnx_ref - (Fx + Frx), where Fx is the value of said horizontal power component, Fnx_ref is the set value of said horizontal • # ·) ... t nip power component, which is essential perpendicular in relation to gravity, and **** 25 Frx is an estimate of the horizontal force component directed to said magnitude. a rolling cylinder, which is produced by a web tension in the material to be rolled ** v and a peripheral force which projects on the surface of said machine roller and which is substantially perpendicular in relation to gravity. • · * * * * · * 5 A wheelchair assembly, comprising: • X: 30 - a roll-up cylinder (203, 303, 403), which is movably arranged in the control direction, which is perpendicular to the axis of said roll-up cylinder and deviates from the horizontal direction in the and - a force generating device (205, 305, 405) adapted to press said reel cylinder against a machine roller (204, 304, 404) in said control direction, characterized in that said wheelchair device further comprises: 206, 306, 307, 406), which is adapted to define a horizontal force component which acts on said reel cylinder which is substantially perpendicular to the relative gravity and whose direction differs from said control direction, and - a control unit (208, 308, 408) , which is arranged to control the magnitude of the power generated by said power generation plant on the basis of differential magnitude. the heat e = Fnx ref - Fx, where Fx is the value of said horizontal force component and Fnx ref is the set value of said horizontal component of the nip force between said reel cylinder and said machine roller, which is substantially perpendicular to the delaying force of gravity. • 1 * · · • 1 1 ·· 1 1 • · t • · 1 · »» ··· • · · * · · »·· • 1 • · 1 · ·» • · • ·· * · • 1 · «· Φ • · · • · · · · ** t •« • · «·· • · ♦ 1 f • · •« • · • 1 • 1 · * · 1 • 1 ·