JPH0635298B2 - Winder - Google Patents

Description

FIELD OF THE INVENTION The present invention relates to winding webs, for example paper webs being produced on a paper machine. More specifically, it relates to a technique for controlling the deflection of a beam on which a rider roll is mounted in a winder.

2. Description of the Related Art Conventionally, a beam for supporting a rider roll in a winder is a chain guided on a sprocket at the top of a winder frame, or a hydraulic cylinder directly connected to both ends of the beam in the longitudinal direction. It was supposed to be movable by supporting it with either. Often, this beam movement was accomplished by a combination of a chain and a cylinder or beam or other weight applied to the end of the lidar roll. In any of these conventional devices, the force of the load acting on the rider roll that is nip-engaged with the web roll being wound by the winder and the force of the unloading force are both the longitudinal ends of the beam that supports the rider roll. Section or both longitudinal ends of the rider roll itself.

The problem with this device is that there is always some upward or downward deflection, no matter how strong the beam is. This is a very wide machine,
This is a particularly troublesome problem on machines with a width of 300 inches (7.6 m) or wider, for example. When the beam is lifted at its longitudinal ends to release the nip of the rider roll with respect to the web roll being wound, there is a downward deflection in its center. Further, when an external load is applied downward to both ends of the beam in the longitudinal direction, the beam may bend upward at the central part. Either condition causes an undesired bending effect on the beam as well as on the rider roll, which bending effect induces a non-uniform nip load between the rider roll and the web roll being wound in the winder. Become. The greater the deflection of the beam, the greater the problem. This non-uniform nip load then affects the tension as well as the quality of the paper web during winding. That is, when the nip pressure of the rider roll is higher than desired, it crushes or breaks the paper web, and even when the nip pressure is low, it causes soft spots or wrinkles on the web roll during winding. It does.

Also, if the rider roll is divided into several parts and these parts are arranged side by side in the longitudinal direction, it is possible to put a pad on the intermediate rider roll part in order to compensate for the deflection. However, this padding is only suitable for a set of loading conditions. A change in the external load applied to the longitudinal ends of the rider roll or beam will change the profile of the nip between the rider roll and the web roll being wound. The appropriate value of the nip pressure to be applied to the web roll being wound continuously changes as the diameter of the web roll being wound increases so that the external force applied to the beam supporting the rider roll portion is The load, or unloading force, must also change during winding.

OBJECT OF THE INVENTION Accordingly, the present invention contemplates a winder that eliminates the above-mentioned drawbacks.

That is, an object of the present invention is to provide a beam for supporting a rider roll having actuators for loading and / or unloading, which are located not at both ends in the longitudinal direction but at at least two points or more between the both ends in the longitudinal direction. To provide a winding machine.

Another object of the present invention is to provide a winder with less beam deflection than conventional winders of similar length.

It is a further object of the present invention to provide a winder which allows more uniform control of the profile of the nip between the rider roll and the web roll being wound.

The above-mentioned and other objects, features and advantages of the present invention will be described when the following description is read with reference to the accompanying drawings.
It will be more obvious.

SUMMARY OF THE INVENTION The present invention eliminates, or at least mitigates, the problems associated with the deflection of a beam supporting a lidar roll in the span between the longitudinal ends of the beam. This is accomplished by applying an external load force or unloading force to at least two points between the longitudinal ends of the beam with the rider roll portion attached, rather than to the longitudinal ends. It Strictly speaking, this means that the distribution of the externally applied load force or unloading force is made uniform, and the load force or unloading force is applied only to the longitudinal ends of the beam supporting the lidar roll portion. This is to minimize the deflection of the beam when applied to the. Furthermore, this will result in a uniform nip pressure on the roll of paper web being wound on the winder drum due to the load applied to the rider roll.

In the present invention, the load or unload force of the beam supporting the rider roll is applied by a hydraulic cylinder or a load actuator that can take the form of a mechanical ball screw. There may be two, three or more load actuators of this type. These positions shall always be inside the web width of the winder drum, regardless of the minimum width of the winder. The external load is preferably applied to a point separated from the end of the beam by a distance of about ¼. Generally, if there are two fulcrums in the middle,
Approximately 10 of the beam length measured from the end of the beam in the longitudinal direction
%, Up to about 40% of the beam length measured inward from either beam longitudinal end, especially about the beam length
Distances not exceeding 25% are preferred. Since the deflection of the beam varies from point to point of the beam, the anti-deflection force that needs to be applied by each of the load actuators will also vary accordingly. Therefore, it is advantageous that each load actuator can be controlled separately, if desired.

Another desirable material of the present invention is that, in addition to reducing beam deflection, the actuation of the load actuator at the middle of the beam rather than at the longitudinal ends significantly changes the mode of vibration of the lidar roll and the beam. . This can increase the natural frequency of the rider roll assembly, which provides the rider roll nip for the web roll being wound on the drum of the winder, resulting in significantly reduced vibration. It should be noted that this vibration can be caused by the circulating frequency encountered during normal operation of the paper web winder.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail based on the embodiments shown in the accompanying drawings.

The deflection of the beam uniformly loaded and supported at both ends in the longitudinal direction is expressed by the following equation.

Deflection in the case of a uniformly loaded beam supported at two intermediate points apart from both ends in the longitudinal direction can be expressed by the following equation.

( _Wherein f _max = maximum deflection, f _ctr = deflection at beam center, q = load per beam length unit, E = Young's modulus, I = moment of inertia, X = measured inward from beam end (Distance between each of two fulcrums, l = length of beam) When the beam is supported only by two intermediate fulcrums distant from both ends in the longitudinal direction, the deflection at both ends of the beam in the longitudinal direction is the deflection f _ctr at the center of the beam There are equal separations X.
This distance X can be calculated as approximately X = 0.22 (l). Therefore, the comparison of f _ctr of intermediate support beams (less end abbreviated) longitudinal ends to the support beams of f _max, deflection f _ctr of intermediate support beam about the deflection f _max end support beam 2 It is decided to be about%.

Naturally, by providing two or more load actuators that support the beam from the winder frame,
The beam can be supported. For example, there may be three to ten such load actuators supporting the beam. The plurality of fulcrums may be equally spaced, or the load actuators may otherwise be unequally spaced at locations that produce large deflections. Regardless of whether there are two or ten fulcrums set, the magnitude of the beam and lidar roll vibrations will be reduced compared to the magnitude of the end support beam vibrations. Furthermore, since the intermediate fulcrums, that is, the fulcrums, increase the natural frequency of the beam lidar roll structure, the vibration is reduced while the operating speed of the winder is normal.

The rider roll flexes either upwards or downwards depending on whether it is in support or load. Another factor affecting the direction and magnitude of beam deflection is the location of the supporting or loading force along the beam length, as previously described mathematically and as described below.

FIG. 1 diagrammatically illustrates, in a greatly exaggerated form, the problems associated with conventional end load beams used to mount a rider roll assembly to a paper machine winder. As the core spool 42 on which the paper web is to be wound begins rolling on the two drums 22, the load actuator 18 loads the beam 10 downwardly against the core spool, winding the paper web securely onto the core spool. Let Although the beam 10 has a considerable weight, its weight alone is insufficient at some points in the winding cycle to provide adequate force to ensure the desired tension to be wound as the web roll 20. . Therefore, the load actuator 18 exerts an additional force on the beam 10, i.e. on the rider roll support bracket 14, via the mechanism 21 connected to the end of the beam to the web roll 20.
The rider roll 12 is arranged along the rotation axis extending in parallel with the rotation axis 36 of FIG.

However, along the nipping line of contact between the rider roll and the surface of the web roll, an arrow 19 is applied to the end of the beam to obtain the desired nipping force or nip pressure.
The force of the load actuator acting downward in the direction of
The beam is deflected according to the law of mechanics and curved upward in the direction of arrow 23. This is because the upward deflection significantly reduces or eliminates contact of the inner portion of the rider roll 12 with the web roll 20 in the illustrated example, while the outer rider roll 12 is subjected to a force greater than the desired force. This is detrimental to both the beam rider roll assembly as well as the web roll being wound. In addition, high and undesired contact forces exerted on the ends of the web roll tend to crush and damage the paper web before it is for sale.

Of course, it is possible to insert the padding 16 into the rider roll support bracket 14 of the beam 10 so that the rider roll at the center of the beam is positioned a greater distance below that of the rider roll near the ends of the beam. The solution should only be good under certain load conditions, and under other load conditions it should cause crushing problems similar to corresponding positions along the length of the web roll.

Also, as the diameter of the web roll being wound increases, its weight reaches a point where the tension of the paper web being wound on the web roll is sufficient without additional external loading. In fact, at a certain diameter, depending on the type of paper web produced, the nipping force along the line of contact between the rider roll and the web roll is reduced to zero. This load state is the reverse of the state shown in FIG. 1 because the force of the load generated by the load actuator is upward, as opposed to arrow 19. The beam then descends so its deflection is downwards, as opposed to the deflection arrow 23. This unloading condition is an extremely common operating condition.

The downward descent of beam 10 causes a series of problems similar to those already described. That is, the downward deflection of the beam causes the central rider roll to contact the web roll with greater force than the outer rider roll, and therefore the undesired high nip load, i.e., at the middle of the web roll instead of at the ends. This is due to the fact that there is a force to crush the paper web.

Next, an embodiment of the present invention will be described with reference to FIG. In this figure, two load actuators 18 have a mechanism 21
Are shown to be connected to beam 10 at the middle of the beam rather than at or near the ends of the beam. Thus, as far as flexing is concerned, the effective length of the beam (ie the distance between the features 21) is short compared to the effective length between similar fulcrums shown in the apparatus shown in FIG. This _results in a significant reduction in the beam center deflection, f _max , as compared to the end-supported beam, according to the deflection equations described and discussed above. This is shown schematically in FIGS. 5A and 5B. That is, the end-supported uniformly loaded beam 10 shown in FIG. 5A.
Deflection f _max due to the force arrow 19 of FIG. 5 is greater than the deflection f _ctr due to the force arrow 19 (position of the load actuator 18) of the intermediately supported uniformly loaded beam 10 shown in FIG.

The practical significance of this significantly reduced deflection is that the beam
The rider roll 12, mounted via a rider roll support bracket 14 to the bottom of 10, provides a greater and uniform level of nipping contact with the web roll 20 being wound on two drums 22. This has nothing to do with whether the load actuator is supporting the beam upwards or downwards. When the beam is acted upon by a plurality of load actuators located midway between its ends, some parts of the beam will flex upwards and others will flex downwards. This means that the maximum upward or downward deflection at a given point along the beam length from a horizontal plane extending through the zero deflection point is significantly less than the maximum deflection when the beam is supported only at the ends. That is.

The wave roll shown in FIG. 2 increases in diameter as
The upward force exerted by the web roll outwardly in the direction of arrow 40 between the rider roll 12 and the drum 22 imparts an upward force opposite the beam 10. Also, as the web roll gets larger, it surely gets heavier. Eventually, the web roll will be heavier than the weight required to impart the desired pull to the paper web in the web roll. At this time, the load actuator exerts an increasing amount of upward force on the beam 10, while the reliably increasing diameter of the web roll 20 creates the desired nip load between the rider roll and the web roll being wound. The load actuator is biased in the opposite direction to push the beam 10 upwards so as to provide the remaining upward force required for the beam. For certain grades of paper web, the amount of upward force on the load actuator when wound on a large diameter web roll 20 is approximately the total weight of the rider roll assembly.

By positioning the load actuators 18 inwardly between the ends of the web roll being wound, either the upward or downward deflection of the beam 10 is significantly reduced, but this reduction in deflection is achieved by the web roll. The tension of the paper web being wound onto the web roll in order to produce the desired nip pressure at another location along the roll length without creating an unacceptable nip pressure at one location along the length of the web. It provides a very effective working range in which nipping engagement of the rider roll with the web roll surface is maintained, as controlled.

3 and 4 illustrate the invention with respect to its position in the winder following the paper machine. That is,
In FIG. 3, the winder 24 has a pair of vertically spaced frame members 24A, 24B arranged on the side surface, and these frame members 24A, 24B are integrally formed in the front and rear by cross beams 25A, 25B. It is fixed. Cross beam 25A, 2
5B is integrally fixed at the top by two or more top frames 27. In each of the front and back portions, a gear rack 30 is mounted vertically on one of the frame members 24A, 24B to help guide the up and down movement of the beam, as described in detail below. . A pair of load actuators 18 are each mounted on a corresponding top frame 27 via suitable brackets 29. The preferred embodiment uses at least two pairs of such load actuators. One of each pair of load actuators
As shown in FIG. 3, it is installed on the side surface of the beam so as to face the other load actuator. this is,
It enables smoother upward and downward translation of the beam so that the load or unloading force of the load actuator is applied symmetrically to the beam. The mechanism 21 extends downward through the beam and is secured to the bottom of the beam by a large fastener 31 at the bottom.

An articulated shaft having two shaft members 34 is mounted on the top of the beam to allow its vertical translation while maintaining the beam in a horizontal position. A gear 28 is engaged with a keyway at the end of each shaft member 34. The shaft member 34 itself is rotatably mounted in the bearing housing 32. Each inner end of the shaft member 34 is connected to the flexible joint 26, and the flexible joint 26 allows a slight rotational skew between the shaft members 34. It does not, by itself, form part of the present invention, but is an optional part of the winder. This flexible joint
26 allows the rider roll to fit into a web roll.

Since the beam is pushed upwards or downwards, the gear 28
Engages the teeth of gear rack 30 to guide the beam into its desired up and down translational motion.

Although the present invention has been described in detail with reference to the preferred embodiments illustrated in the accompanying drawings, the present invention is not limited to these specific embodiments, and does not depart from the spirit and scope of the claims. It goes without saying that various changes can be made.

For example, more than one pair of load actuators can be placed on the winder frame and supported on the beam and the rider roll attached to it. In addition, additional pairs of load actuators can be spaced as desired to create or reduce beam deflection at various locations.

EFFECTS OF THE INVENTION As described above, the winder of the present invention reduces the deflection of the beam by supporting the beam supporting the rider roll not at the end but at the middle by a hydraulic cylinder or the like. In addition, the vibration can be reduced by increasing the natural frequency, and the nip profile can be controlled uniformly. Therefore, compared with the conventional device that supports the rider roll support beam at its end, For example, it is a particularly excellent device for winding a paper feb produced by a paper machine.

[Brief description of drawings]

FIG. 1 is a front view of a conventional winding machine near a rider roll. FIG. 2 is a front view of a winder having a load actuator operating in the middle of a beam supporting a rider roll according to the present invention. FIG. 3 is a side view of a winder equipped with a load actuator acting on the rider roll beam in the middle thereof. FIG. 4 is a front view of a part of the winder shown in FIG. 5A and 5B are schematic diagrams that schematically show end-supported and intermediate-supported beams. 10 …… beam, 12 …… rider roll, 14 …… rider roll support bracket, 16 …… filler, 18 …… load actuator, 20 …… web roll, 21 …… mechanism, 22 …… drum, 24 …… Winder, 24A, 24B …… Frame member, 25A, 2
5B …… Cross beam, 26 …… Flexible joint, 27 …… Top frame, 28 …… Gear, 29 …… Bracket, 30 …… Gear rack, 31 …… Stopper, 32 …… Bearing housing, 34 ……
Shaft member, 36 …… Rotation axis, 42 …… Core spool.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-157441 (JP, A) JP 59-14456 (JP, Y1)

Claims (1)

[Claims] 1. A winder for winding a web material such as a continuous paper web around a web roll, a core spool for winding the web material, and drum means for rotatably supporting the core spool and the web roll. And a plurality of individual rider rolls arranged parallel to the axis of the web roll and aligned on one axis to contact the web roll in a nipping engagement state, and to separate from the web roll when lifted. Disposed rider roll means, beam means mounted at both ends of each rider roll and mounted for translational movement in close proximity to said core spool and said web roll, and said beam means in its longitudinal direction. At least 2 between the ends
Support means for the beam means for supporting at a point or more and for moving the beam means upward or downward in the winder to control the deflection of the beam means and reduce its vibration. And a winding machine including: