FI118258B - Method and apparatus for attenuating vibration in a wheelchair of carrier type - Google Patents

Description

118258

The invention relates to a method according to the preamble of claim 1 for damping vibrations in a carrier roller type wrench.

The invention also relates to a device according to the preamble of claim 6.

10

The winders cut the full-width web longitudinally into partial webs, after which the partial webs are rolled up into customer rolls. The winders are used for eg. carrier rollers and center rollers for reeling customer rolls or sub rolls. In the case of longitudinal cutters, various rotating parts cause vibrations, which IS reduces the quality of the rolls and causes handling problems. The source of vibration in the winders can be, for example, winding shafts, customer rolls, guide rollers, carrier rolls, roller rollers, spreader rolls, and actuators for transmission.

* · · ··· 20 Longitudinal cutters using carrier rollers are known in the art. for rolling the rollers after cutting the paper or board web.

* * ·:. *. In carrier roller type winders, the longitudinally cut sub-webs are wound around the winding cores, e.g., two rolls or one roller and one roller or two • * · '* *. ···. supported by track. In the following description and claims, for simplicity, the term carrier roll is used to refer to carrier roll type; the roller support roll (s), meaning both the carrier roll and the carrier roll * · · ·· «·.

• · • · · ·. '·. ··

Also known in the art are variable geometry carrier rollers in which one or both of the carrying rollers carrying * * · * · 30 are movable. The central horizontal position of the roll formed in such: * * .. variable geometry winders depends on the relative position of the carrier rolls and the diameter of the roll. In the reels, the partial webs are wound around the sleeves in rolls and the longitudinal successive sleeves are locked in place by a sleeve locking device at each end.

5

In the case of roller type reels, firstly, a press roller with small diameter diameters has been used to provide the nip load required for the rolls and as the rally mass has increased sufficiently when the roller is no longer needed due to nip load, the roller is held on rolls until the end of rolling. or bouncing, you can get out of the carrier rolls and not fly out of the rally.

In carrier roll cutters, the high vibration of the press roll bar often causes the eccentricity or rigidity of the rallies 15, whereby the vibration is also transmitted to other parts of the rally. Also, the roller rollout risk increases when the roller bar is vibrating strongly.

In practice, the most common way known in the art is to avoid vibrating · · · · *. 20 is to lower the travel speed manually, so that when you reach the • vibration point, the travel speed is lowered and the vibration damped. In addition, arrangements are known in the art for variable geometry carrier rollers in which the distance between the carriers is changed to dampen vibration.

One of the known solutions is that vibration avoidance at running speed:. by varying to reduce the capacity of the carrier reel and in addition to the speed change ·· *. These may impair the quality of the rallies, as tension variations associated with speed variations may cause layers to protrude to the rally ends.

30 One of the oscillation problems of carrier rollers is also the vibration of the roller bar * • * ·· ly. No actual solution is known in the art for damping machine and vertical oscillations of the weight of a carrier roller. As a solution to the problem, attempts have been made to increase the vibration damping structure by attaching the press roll bar with flexible members to the guide carriages of the roller body. However, the effect of this type of solution has proven to be very limited.

S In the prior art, in practice, as the vibrations of the press roll bar increase to a high level, a safe way to reduce vibration has been found to be the reduction of travel speed.

As is known in the art, the vibration levels of a press roll bar may have often been very high, but the adverse effects of the vibration have not been completely assured. Based on practical experience in the Vii-10, it appears that the machine-directional vibration of the press roll bar is related to the close relative phenomenon of the bounce phenomenon of rollers, i.e. roller sports where the contacting ends of adjacent rollers move at the same rate. These problems have been practically solved in the prior art, for example, by avoiding vibration by making the bending stiffness of the beam 15 so high that the lowest characteristic frequencies of the vibration remain above the excitation frequencies. This prevents the print roll bar from resonating with the excitation, and the vibration remains at a tolerable level. In practice, however, as machines get wider and excitation frequencies rise with increasing speeds, it is often not possible to increase the bending stiffness of ***: ***: 20 because the beam cross-section would become too large for practical use; *** ; reconstructions.

* · · * * · * * · •; *; It is an object of the invention to provide a method and apparatus for damping vibrations in a carrier roller type roller.

• · · 25 j. *. One particular object of the invention is to provide a method and apparatus for damping vibrations in a carrier roll winder, in particular for vibrations * in a press roll bar.

• Φ · • · • * * * 118 118 118 118 118 118 118 118 118 118258 4

In order to achieve the foregoing and further objects, the process according to the invention is essentially characterized by what is stated in the characterizing part of claim 1.

The device according to the invention, in turn, is essentially characterized by what is stated in the characterizing part of claim 6.

In the method according to the invention, the vibration of the printing roll bar is reduced by supporting the bar in addition to the ends, but also at a point (s), preferably in the middle, with high vibration amplitudes of the lowest eigenmodes. The beam is thus supported at least at one point in its span.

Preferably, the support is constructed such that the stiffness and damping of the machine direction of the printing roll bar substantially increases.

In the device according to the invention, the print roll bar is supported not only at the ends but also at least at one point in its span. The support is most advantageously placed

• M

I! to the point where the vibration amplitudes of the lowest eigenmodes are high,: *: 20 whereby the stiffness and damping in the machine direction of the printing roll bar substantially increases: ***; thereby damping the vibration of the print roll bar.

* * * * · · ··· '•: *: A preferred embodiment of the method of the invention also seeks to • attenuate oscillations in the vertical zoom, whereby the beam supports its span • in the vertical direction. In this case, the actuator, eg a hydraulic cylinder, is used in connection with the method because the beam moves in the vertical • * »Φ direction.

In this specification, the machine direction refers to the principal direction of the web direction, which is substantially perpendicular to the horizontal and vertical direction.

• * * * · · * ·. t * 118258 5

According to a preferred embodiment, the device according to the invention is a device arranged in connection with a carrier roller type runner in which at least one support arm is attached to the pressure roller beam, the other end being supported by the roller frame structure via linear guides. As the roller-5 progresses, the support arm moves freely upward along the guide and, with the press roll in the up position, the shield can be opened and the rollers are pushed out of the cutter. The linear guide is secured, for example, to a rigid frame beam in the shield guard, which, when attached to the shield guard, rests at its lower end on the base of the cutter by means of a conical pin or similar guide. At its upper end, the frame beam can also be connected by means of an actuator, for example, to the frame cross member when the guard guard is closed, i.e. in its lower position. When the weight is desired to be lowered with the fender guard raised, the coupling between the press roll bar and the fender guard is removed by a tracked mechanism on the support arm.

In applying the invention to a carrier roll-type cutter, in which the second carrier roll is formed of a belt roll, the press roll bar does not move parallel to the guard, but at an angle, e.g., 10 degrees to the vertical. In this case, the device according to the invention is preferably implemented by changing the length of the support arm t · · ί, ϊ · by means of an actuator such as a telescopic cylinder, a hydraulic cylinder, • 1 · • 2.ί 20 either during winding or permanently, or that the shin guard is in a vertical position, but with a linear guide of the support arm at an installed angle of 10 °, for example, viewed from the front of the cutter. In this case, there is a joint f J on both ends of the support arm. The machine support of the press roll bar is provided by an actuator.

25: In a preferred embodiment of the invention, an actuator movable vertically along a linear guide is added to the device, which can be controlled, for example, so as to stop the movement of the support arm, preferably in a constant manner. force to dampen vibrations in the vertical direction.

: T: 30 • · • 1 e 1 ·., I · ···.

2 • · · 3 • · 118258 6

According to a further preferred embodiment, the arrangement according to the invention can also be used by forcing the printing roll bar in the vertical direction into a desired shape, for example convex, concave or straight, whereby a smaller roll diameter than the center rolls can be taken into account. the gaps between the press roll and the resulting rolls.

In the following, the invention will be described in more detail with reference to the figures in the accompanying drawings, in which details the invention is not, however, to be narrowly limited.

Fig. 1 schematically shows an embodiment of the invention in which the lower arm of the printing roller is attached to the frame structure of the supported guard, viewed from the end of the roll.

15

Fig. 2 schematically illustrates an embodiment of the invention in which the support arm of the printing roller is attached at its upper end to a supported roller frame structure, viewed from the end of the roller.

Fig. 3 schematically illustrates an embodiment of the invention having an oblique press roll movement and a lower roll end support arm attached to a supported frame structure.

Figure 4 schematically illustrates an embodiment of the invention having a vertical damping array and a support arrangement attached to the top beam.

• · ♦ · · • 1 ♦

Fig. 5 schematically illustrates an embodiment of the invention having a support structure formed by a plurality of upper arms, viewed from the front of the roll.

Figures 1-5 show like reference numerals for like parts in different embodiments of the invention, unless otherwise indicated.

• · • · 1 * ·· •. 7th

118258

In Figures 1-5, the carrier rollers of the carrier roller 10 are designated with reference numerals 11 and 12, except for Figure 3, where the second carrier roller is formed of a roller 12A-12C, i.e. a belt roller comprising rollers 12A, 12B In the carrier roller 10, a web roll 13 is formed supported by and through the carrier rollers. The printing roller of the carrier roller 10 is denoted by reference numeral 14 and the printing roller bar by reference numeral 20. The barrier frame bar of the carrier roller 10 is denoted by reference numeral 15, which frame member 15 is preferably supported at the bottom and possibly also top-10. The intermediate beam of the frame structure of the carrier reel 10 is denoted by reference numeral 19, which intermediate beam 19 is preferably supported from above and possibly also from below. In the embodiments of Figures 1-5, the press roller beam 20 is tracked to move vertically relative to the side ribs of the roller 10 and the ends of the presser roller beam 20 (not shown). In the embodiments of Figures 1-3, the support arms 21 of the print roller beam 15 20 are tracked to move vertically along the frame beam 15 or the spacer beam 19, the tracked tracks 16 are secured to the horizontal frame beam 28 by an additional strut 27 ···. Fig. 1 shows a support structure with a lower bracket, whereby the frame beam 15 of the roller * * * 'is attached to the frame structure below the roller, as well as the support arrangement shown in Fig. 3. The support arrangement according to Fig. 2 is upper supported, wherein the intermediate beam 19 of the frame structure is connected at its upper end to the upper structures of the roller (not shown), the press roller beam 20 is connected by a support arm 21 to the carriage 22 2 and 3.

• · • · · • ♦ * ·

In the embodiment shown in Fig. 2, a further preferred embodiment is shown in which yy [yj is an actuator for braking the support arm 21 along a linear guide 16 • · y *. «# 23 which can be controlled e.g. to tend to brake the arm movement • ·" · * 30, thereby damping the oscillation of the press roll bar 20 also in the vertical direction • In the embodiment shown in Figure 2, an actuator 23 and a barrel 118258 8 are connected to the shaft by which the movement of the support arm 21 of the press roll bar 20 .

In the embodiment shown in Fig. 3, the second carrier roll 5 of the carrier roll type roller 10 is formed from a belt roll 12A to 12C, with the movement of the printing roll 14 at an angle α to the vertical. In this embodiment of the invention, the length of the support arm 21 is varied, for example, by providing the support arm 21 with a telescopic cylinder or a lever hinged between the guide and the press roll bar. Fig. 3 shows a rigid arrangement using a so-called length-deflecting element, wherein the support arm is variable in length, or the support arm is of standard length and provided with an additional variable length component. The lengths of movements required are quite small. Possible large stroke lengths can be compensated for such that the structure comprises, for example, a support / actuator / lever which is also inclined in the service side / actuation direction of the carrier roller 10. In the embodiment of Figure 3, the structure is a bit more complex because of the fact that the press roll bar 20 does not move parallel to the shield but at an angle α of 10 ° to the vertical. The operation of the device can be accomplished in the following ways.

• · · ·. · · - The length of the support arm is changed by the actuator as the roll progresses.

• · · * 20 - The shield and its frame structure 15 are also at an angle of 10 degrees, either during roll-up or permanently, whereby the shield comprises additional means such as hinges and an actuator for adjusting the angle J j | - the guard is in a vertical position, but the linear arm of the support arm 21: ϊ is at an angle of 10 degrees if viewed from the front of the mower. Thus, both ends of the support arm 21 have an articulation and the length of the support arm 21:: 1: is changed as the roll progresses. The machine-directional support of the press roll bar 20 is provided by an actuator.

* · 1 • ·

According to Fig. 4, the press roller beam 20 may also be attached to the upper frame beam 28 extending in the horizontal direction, with the support arm 21 of the pressure roller beam 20 being connected by means of an actuator 26 to the fastening members 27 In the embodiment shown in Fig. 4, the actuator 26 is used, for example, for hydraulic damping, which is attached to a support arm 21 via a joint 25. The joint is preferably fixed. This further preferred embodiment of the invention 5 can also be used by forcing the press roll bar 20 into a desired shape, for example convex, concave or straight, whereby the shape of the press roll bar 20 can take into account the smaller or larger diameter of the peripheral rolls avoiding gaps between the press roll 20 and the forming rollers.

10

5, it is apparent from the front view of the reel 10 that more than one of the support arms 21 can be arranged in the width direction of the reel if necessary. In this case, the support arms are preferably located at the locations where the vibration amplitudes of the lowest eigenmodes are greatest. In the figure, the native form of the oscillation 15 is represented by a schematic curve F. As can be seen from Figure 5, the support arm / arms 21 of the weight bar may be off the centerline of the machine.

According to the invention, at least one support arm is attached to the print roll bar 20

Il V: 21, the other end of which rests on the frame beam 15 of the gate guard or the like or on the intermediate beam 19 of the body 1 through the linear guide 16. As the roll progresses * 1 1 The support arm slides upward along its guide with the press roll 14 up e 1 • t | | in its position, the shield can be opened and the roller 13 is pushed out of the roller. The linear guide rail 16 is secured to a rigid body bar 15 in the shield which, with the shield closed, rests at its lower end on the foundations of the roller 20 with the lower end, e.g. with a pin 17 guided by a tapered pin 18. 16 is fixed to the spacer beam 19 which is upper: 2; is connected to the reel body. When it is desired to lower the press roll bar 20 with the press rolls 14 with the gate guard up, the press roll bar 20 and the rocker • ·. ··· are removed. link between linkage.

• 1 * 1 1 a a 30 • · • · · «· * 1 1 • 1 1 2 * 1 118258 10

The invention has been described above with reference to some preferred embodiments thereof, the details of which, however, are not intended to be narrowly limited.

• · «* · · • · 1 ·· 1 • 1 1 * Φ * 1 * 1 · · • 1 • · · • 1 · 1 · • 1 1 ** · · • • • 1« »· ** ·· • · · * 1 1 c · • ♦ · Φ · · * 1 · 1 tl · * · • * * · · Φ * t t 1 1 1 1 1 1 ··· • · * · · ·

Claims (14)

1. A method of dampening vibration in a carrier-type wheelchair in which wheelchairs (10) are cut longitudinally into sub-tracks from a full-width web with a roller cutting machine wound around rolling cores supported by two carrier rolls (11,12; 11.12A-12C) and by mediating them, in which method a pressure roller (14) is used in the wheelchair (10) for effecting a nip load at small roller diameters and for pouring the rollers (13) firmly onto the support rollers at Large roller diameters, characterized in that in the method a pressure roller beam (20) is supported for damping vibrations in addition to the ends also in at least one place on its span in such a way that the stiffness and damping of the pressure roller beam (20) increase substantially. 2. A method according to claim 1, characterized in that in the method the pressure roller beam (20) is supported with a support arm at such a place (s) where the oscillation amplitudes of the lowest specific shapes are large. 3. A method according to claim 1 or 2, characterized in that in the method: the pressure roller beam (20) for damping the vibrations is supported in such a way that the rigidity and damping of the pressure roller beam (20) in the machine direction increases substantially. The method according to any of claims 1-3, characterized in that, in the method, the support of the pressure roller beam (20) over its span is increased in vertically oriented by mediating an action device (23). 25 • * · Method according to any of claims 1-4, characterized in that, in the process, the shape of the pressure roller beam (20) is changed with a connection with the support arm •: (21) to the pressure roller beam (20). provided action device (26) to avoid slots between the pressure roller (14) and the rollers (13) formed. f V 30 ··· • · • · ··· 15 118258 6. Device for attenuating vibrations in a wheelchair-type wheelchair, which wheelchair comprises two carrier rolls (11,12; 11,12A-12C), by means of intermediate and supported by which sub-tracks foam from a full-width web with a roller cutting machine are wound around rolling wheels and which wheelchair (10) comprises a pressure roller (14) for providing a nip load at small roller diameters and for pouring the rollers (13) firmly onto the support rollers at Large roller diameters, characterized in that the pressure roller (14) in the wheelchair (10) is connected to a pressure roller beam (20) and the pressure roller beam (20) is supported by a support arm (21) except at the ends in addition at least at one point on its span. 10 7. Device according to claim 6, characterized in that the support of the pressure roller beam is positioned in such a way that the stiffness and damping of the pressure roller beam (20) in the machine direction increases substantially. 8. Apparatus according to claim 6 or 7, characterized in that the support of the pressure roller beam (20) is realized with at least one support arm (21) which is placed at a place / places where the oscillation amplitudes of the lowest specific shapes are Large. • * * • * · * · * * »· ·: 20 Device according to any of claims 6-8, characterized in that, at the * * * * * * ... * pressure roller bar (20) in the wheelchair, at least one support arm (21) is attached, one end of which • · * * · · · 1 is supported on a body structure (15), for example a body structure for a gap protection, by means of linear guides (16), which support arm (21) is arranged • move along the track (16) freely eaten as the roll-up progresses. 25 • · ·,. ., I " 10. Device according to any of claims 6-9, characterized in that the linear guide (16) of the wheelchair (10) is attached to a frame structure, for example, · · · · knowledge intermediate beam (19). ). • * · • · • · • · «♦ · · • V 30 11. Device according to any of claims 6-10, characterized in that an action device (23) which brakes the support arm (21) is arranged in conjunction with the support arm (21) for the pressure roller beam (20). movement in the vertical direction along the linear guide. Device according to any one of claims 6-11, characterized in that the device redirects an action device for changing the length of the support arm (21) when the pressure roller bar (20) is arranged to move at an angle (a) relative to it. vertical direction. Device according to any of claims 6-12, characterized in that the device comprises an action device (26) arranged in conjunction with the support arm (21) for the pressure roller beam (20) for avoiding gaps between the pressure roller (14) and the rollers ( 13) formed. • · · · · • * * * * * * * * * * * * * * * * * * * * * * * * * · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · φ Φ • φ φ φ φ φ φ • * • * φ · · φ · # ·