CA2627703C

CA2627703C - Core locking device

Info

Publication number: CA2627703C
Application number: CA2627703A
Authority: CA
Inventors: Kenneth Akerlund; Heikki Foehr; Kimmo Penttila; Antti Jetsu; Henry Virta
Original assignee: Metso Paper Oy
Current assignee: Valmet Technologies Oy
Priority date: 2007-03-30
Filing date: 2008-03-28
Publication date: 2012-05-29
Anticipated expiration: 2028-03-28
Also published as: FI20075220A; FI121174B; DE102008015670A1; CA2627703A1; DE102008015670B4

Abstract

The invention relates to a core locking device, which comprises elements for locking the core locking device (10) into a winding spool, advantageously into a core, of a reel being wound on a carrier--roll winder which core locking device (10) is located on guides (27; 57) arranged into connection with the winder, which core locking device (10) moves as the winding proceeds along a centre (18) of the reel being formed. The core locking device (10) comprises an elastic element (23; 31; 40) for isolating the motion in the direction of the radius of the web reel being formed and, by means of the elastic element (23; 31; 40), a portion of the core locking device (10) engaged in forced vibration is arranged to be limited such that the portion of the core locking device (10) in forced vibration is minimised.

Description

Core locking device The invention relates to a core locking device.

As known from prior art, on the slitter-winder the machine reel is unwound, the wide web is slit in the slitting section into several narrower partial webs which are wound up in the winding section around winding spools, such as cores, into customer reels.
When the customer reels are completed, the slitter-winder is stopped and the reels i.e.
the so-called set is removed from the machine after which the process is continued as the winding of a new set. These steps are repeated periodically until paper runs out of the machine reel, whereby a machine reel change is performed and the operation starts again as the winding of a new machine reel. In the winding section i.e. on the winder, longitudinal successive cores are locked in place as a core array by a core locking device located at both ends of the array. On the slitter-winder, a carrier-roll winder is often used as the winder on which the partial webs are wound carried by two carrier rolls into partial web reels via a nip between a second carrier roll and a fibre-web reel being formed.
As the carrier roll, also a belt arrangement i.e. a so-called set of belt rolls located around two lead rolls can be used.

Also, slitter-winders are known from prior art in which a carrier roll winder is used for winding partial reels after the slitting of a paper or board web. The present invention relates to winders of carrier roll type in which the slit partial webs are wound around winding spools, e.g. cores, supported by two rolls or by one roll and one set of rolls. In the following description and claims, the term carrier roll is used for simplicity when referring to a support roll/set of rolls of a winder of carrier roll type i.e.
including both the meanings of a carrier roll and a set of belt rolls.
Additionally in this description, the term core also means other types of winding spools used and suitable for use on winders of carrier roll type.

Furthermore in this description, partial webs being wound and web reels being formed on the winder are referred to, based on context, either in singular or plural yet meaning all partial webs and web reels handled on the winder if not otherwise stated. An edge reel/reels mean the outmost reel of both ends of the reel array.
From prior art are also known carrier roll winders of variable geometry in which one or both of the carrier rolls carrying the reel are displaceable. On such variable-geometric slitter-winders, the location of the centre of the reel being formed depends on the position of the carrier rolls in relation to each other and the diameter of the reel.
From prior art is known a core locking device which is located on a guide arranged into connection with the winder movable when the diameter of the reel increases as its centre moves. Thus, the position of the core locking device changes during run. The position of the core locking device moving up on the guide also substantially changes in the machine direction, when one or both rolls move on the variable-geometric winder as the winding proceeds. The task of the core locking device is thus to support the cores i.e. winding spools in the cross-machine direction i.e. in the axial direction of the cores. The purpose of the core locking device is to keep the cores during the whole winding in the same places in the axial direction yet to allow the cores to move almost without resistance substantially in the vertical direction and often also in the machine direction. It is also known from prior art to fasten the core and the core locking device in each other by means of a rigid core socket.

A problem related to core locking devices known from prior art is vibration which occurs during winding. Another problem related to core locking 'devioes known from prior art is the eccentric rotating motion of the core locking device which is descriptively also called the shaking of the core locking device. Shaking typically occurs in the middle and final steps of winding and it is caused by the eccentricity of the core of the edge reels. The eccentricity of the reel means a situation in which the core is not in the rotation centre of the reel. The eccentricity of the edge reel causes the core locking device forced vibration which is usually the stronger the greater the eccentricity.

The edge reel can be formed eccentric e.g. due to the absence of press roll contact. The absence of press roll contact, again, is usually due to that there are diameter differences of reels in the set caused by thickness profile errors. Typically, the problem is edge reels smaller than centre reels, whereby the edge reels are easily formed eccentric.
Eccentric reels can also be formed in the middle of the set if, due to profile errors of the web, the centre reels remain smaller of their diameter. The core locking device might intensify the eccentricity of the edge reel if it resonates suitably with eccentricity in the initial step of forming. After eccentricity has been formed, there is in practice no possibility to affect the edge reel with the core locking device for changing eccentricity due to the relatively small structural rigidity of the core locking device in the direction of the reel radius.
The shaking of the core locking device, again, causes fatigue load in the structures which can break the core locking device, which causes production breaks on the slitter-winder.
Due to shaking, it is also possible that the run speed of the slitter-winder is dropped, whereby production capacity decreases.

For the part of prior art, we refer to Finish Patent Specification No. 116281 which describes a core locking device which comprises elements for locking the device in a winding spool, advantageously in a core, of a reel being wound by a carrier-roll winder. The device is located on a guide arranged into connection with the carrier-roll winder which locking device moves as the winding proceeds along with the centre of the reel being formed along the guide. The device comprises an actuator for producing a counterforce for the force caused by the mass of the core locking device in the changed position of the core locking device. The actuator of the device can be arranged as an active or a passive damper and also to function as a device detecting and/or eliminating the bouncing phenomenon. The bouncing phenomenon refers to a winding problem in which one or more reels bounce in the machine direction from one carrier roll to another. However, this known arrangement has not been able to solve all problems related to shaking.

For the part of prior art, we also refer to DE published application 102005000050 which describes a winding device for winding a material web, particularly winding a paper or board web around a core into a reel, in which the reel is in a winding station between two carrier rolls bearing-mounted from its end sides with guide heads.
The guide heads are arranged movable in the vertical direction by linear guides corresponding to the diameter of the reel by means of guide carriages. The guide heads comprise an elastic element, particularly a rubber element, over which the guide heads are bearing-mounted in the guide element, whereby the guide elements are joined to the guide carriages. This known arrangement has not still been able to eliminate the problems related to shaking, because it is structured to be elastic in the axial direction and eliminating problems related to shaking require elasticity particularly in the radial direction. For the part of prior art of equivalent type, we also refer to DE published application 102005039302.

The object of the invention is to provide a core locking device in which above-described problems occurring in arrangements according to prior art will be eliminated or at least minimised.

An object of the invention is also to provide an arrangement in which particularly the shaking of the core locking device has been eliminated or at least substantially diminished.

According to the invention, the core locking device comprises an elastic element by means of which the portion engaged in the forced vibration of the core locking device is decreased, whereby shaking is eliminated or at least substantially diminished. Then by means of the invention, a core locking device adequately 5 rigid in the axial direction is provided and by means of which required elasticity in the radial direction is enabled for eliminating problems related to shaking.
According to an embodiment of the invention, the elastic element of the core locking device comprises a ball joint and damping elements arranged into connection with it, by means of which the portion of the core locking device engaged in forced vibration has been limited and vibration damped. The ball joint allows the end of the shaft of the core locking device to rotate on the side of the reel and receive axial motion, whereby in a possible shaking situation only the end takes part in the shaking motion, the other core locking device being stable.
According to an advantageous additional characteristic of the invention, the stabilisation of the other part of the core locking device can be assisted by a brake by which the motion is stiffened.

According to an embodiment of the invention, the core locking device i.e. the core lock comprises a part moving axially which includes a damped set of joints releasing a degree of freedom in the direction of the reel radius which set of joints is inside the outer diameter of the winding core of the reel being wound.

According to another embodiment of the invention, the core locking device i.e.
the core lock comprises a part moving axially which includes a damped mechanism releasing a degree of freedom in the direction of the reel radius which mechanism is substantially in the centre line of and/or concentric with the part moving axially.

According to an advantageous additional characteristic of the invention, the core locking device comprises a sturdy body stable in forced vibration.

In connection with the invention advantageously, the vertical motion of the core locking device can be stiffened/damped by means of brakes arranged into connection with the core locking device. Furthermore, the motion of the rotating body of the core locking device can advantageously be stiffened/damped by means of second brakes arranged into connection with the body of the core locking device.

The mass of the core locking device according to the invention is typically 100-200 kg and the portion engaged in forced vibration caused by eccentricity is 10-50%, advantageously at the most 20%.

According to an embodiment of the invention, into connection with the core locking device is arranged a floating core socket which enables small motion for the core, whereby the vibration of the core will not be conveyed to the core locking device. The floating core socket comprises two bearings substantially at a straight angle in relation to each other and a coil spring or equivalent which enables motion and centres the socket. By means of the bearings, the socket is able to float eccentrically in relation to the core locking device, whereby the coil spring compressing the bearing together bends enabling eccentricity yet keeping the bearing as one. At the end of the socket is advantageously arranged a flange which prevents the opening of the bearing when the locking device is being removed from the core.

In accordance with an aspect of the present invention, there is provided a core locking device, comprising elements for locking the core locking device to a winding spool of a reel being wound on a carrier-roll winder, which core locking device is located on guides arranged in connection with the winder, which core locking device moves, as the winding proceeds, along the centre of the reel being formed, wherein the core locking device further comprises an elastic element for isolating the motion of the core locking device in the direction of the radius of the reel being formed and that, by means of the elastic element, the portion of the core locking device engaged in the forced vibration is minimised.

The invention will now be described in more detail with reference to the figures of the accompanying drawing, to the details of which the invention is, however, by no means 6a intended to be narrowly confined.

Figs. 1 A-1 B schematically show an embodiment of a core locking device.

Figs. 2A-2B schematically show another embodiment of a core locking device.

Fig. 3 schematically shows an embodiment of the invention.
Fig. 4 shows a schematic partial enlargement of Fig. 3.
Fig. 5 schematically shows an example of the implementation according to an additional feature of the invention for a coupler mechanism to be used in connection with the invention.

Figs. 6A-6D schematically show an embodiment of the invention.

In the figures, the same references are used of parts corresponding each other if not otherwise stated.

Figs. 1 A-113 and 2A-2B schematically show some examples for a core locking device i.e. a core lock 10 of a winder of a slitter-winder. In the embodiment according to Figs. IA-113, the motion of the core lock 10 during winding is formed of motion provided by means of vertical motion P and rotating motion K.
In the embodiment according to Figs. 2A-2B, the motion of the core lock 10 during, winding is formed of motion provided by means of vertical motion P and horizontal motion V. The invention can also be applied as core locking devices of many other types of winders of slitter-winders, particularly in connection with such slitter-winders which utilise a winder of carrier roll type.

In the embodiment shown in Figs. 1 A-1 B, as the winding proceeds, the core lock 10 moves along with a centre 18 of the reel in the vertical direction P along two linear guides 27 located at a distance from each other. For the linear guide 27, carriages 28 of the core lock 10 are bearing-mounted by means of bearings 29.
In a body 19 of the core lock 10, arms 16 rotating in the rotating motion K are pivoted with pivots 17 which arms join a shaft 22, at the end of which there is a spindle 21 located in the core being in the centre 18 of the reel. Into connection with the core lock, actuators (not shown in the figures) are arranged, e.g.
hydraulic cylinders, for implementing the vertical motion P and the rotating motion K.

The rotating motion K of the rotating arms 16 pivoted with the pivots 17 in the body 19 of the core lock 10 can be stiffened with a brake 14, e.g. a hydraulic brake, which brakes from a brake disc 15 fastened by means of a middle piece 19A in the body 19 of the core lock 10. Between the hydraulic brake 14 and the rotating arm 16, there is a power sensor 16A by which the lateral force affecting the rotating arm 16 can be measured.

The motion K of the rotating arm 16 of the core lock 10 is stiffened in the initial step of winding by using the brake 14. The brake 14 is controlled such that, controlled by the power sensor 16A, the brake 14 is opened and closed very quickly, whereby the force caused by the reel in the core lock 10 will not increase larger than a certain limit.

In the embodiment shown in Figs. 2A-2B, as the winding proceeds, the first carriage 28 of the core lock 10 moves along with the centre 18 of the reel in the vertical direction P along two linear guides 27 located at a distance from each other. For the linear guide 27, the carriages 28 of the core lock 10 are bearing-mounted by means of the bearings 29. In the carriage 28, second guides 57 are arranged in which by means of bearings 59 is joined a second carriage 58 which, as the winding proceeds, moves in horizontal motion V. For the shaft 22 of the core lock 10, in the spindle 21 at the end of which the core in the centre 18 of the reel has been fastened, in the first carriage 28 is made an opening for enabling the horizontal motion V.

According to Fig. 3, the shaft of the core lock 10, e.g. a pipe shaft 22, is movable in the axial direction and it is bearing-mounted most suitably with two slide bearing retainers 24, 25, the one in the rear of which is a rigid slide bearing retainer 24 and the one in the front is an elastic slide bearing retainer 25.
The elastic slide bearing retainer 25 allows the pipe shaft 22 to rotate around the centre of the rigid slide bearing retainer 24. The elastic slide bearing retainer 25 is vibration damping and substantially clearance-free.

According to Fig. 4, between the spindle 21 and the pipe shaft 22 there is an elastic element, e.g. a ball joint 23 and elastic elements 23A. The ball joint allows the spindle 21 to rotate around the centre of the ball joint 23. The rotation is limited by the elastic and damping elements 23A i.e. rubber bushings 23A or equivalent elements located on the same central axis as the pipe shaft 22. The rotation rigidity is set by adjusting the radial rigidity of the rubber bushings 23A.
The radial rigidity is typically 1,000-20,000 N/mm2, most suitably 2,000-10,000 N/mm2.

When the edge reel being wound on the winder is formed eccentric and forced vibration starts, the core lock 10 is controlled such that the body 19 of the core lock 10 is tried to be kept as rigid as possible with the brake 14. If the edge reel is still eccentric, the spindle 21 inside the core of the edge reel has to be able to move for the eccentricity. This motion is enabled by the damped pivoting formed of the ball joint 23 and the slide bearing 24, 25 between the spindle 21 and the core lock 10. The first pivot is in the elastic ball joint 23. The second pivot is formed by that the pipe shaft 22 is able to rotate around the centre of its slide bearing retainer 24 in the rear due to the radial elasticity of the elastic slide bearing retainer 25. From these two pivots 23, 25 is formed a mechanism which allows the spindle 21 to move in the direction of the radius of the edge reel yet simultaneously to centre and dampen the motion.

The portion of the core lock 10 engaged in forced vibration and thus the portion being under the impact of shaking is light and damped, because it abuts in the elastic element, such as the ball joint 23. Then, the tendency of the core lock 10 to intensify the forming of eccentricity in the edge reels is diminished or eliminated compared to prior-art arrangements, because the portion being vulnerable to the effect of shaking is limited, whereby also the effect of shaking loading the structures of the core lock 10 has been eliminated because the motion occurs controllably as damped elasticity in a limited area.

Fig. 5 shows an example for implementing the elastic element and thus implementing the degree of freedom of the spindle 21 in the direction of the reel radius by means of a so-called Oldham coupler. The coupler 31 consists of three parts 32, 33, 34. The coupler 31 comprises in the part 33 being in the middle two pairs of roller bearing units 37A,.37B being on different sides, perpendicular to each other, which join recesses 38A, 38B formed in the outer parts 32, 34 and which roller bearing units 37A, 37B convey the axial forces of the core lock in the core yet allow radial motions. It is possible to arrange a damped radial elasticity feature in the Oldham coupler 31, e.g. observing the principles of the above-described embodiment.

In Figs. 6A-6D, a floating core socket 40 shown in an embodiment of the invention for implementing an elastic element enables for the core a motion of about 10 mm in relation to the core lock 10, whereby the vibration of the eccentric core will not be conveyed into the core lock 10. The floating core socket 40 comprises two bearings 42, 43 substantially at a 90-degree angle in relation to each other and a coil spring 41 which enables motion and centres the socket 40.
By means of the bearings 42, 43, the socket 40 is able to float eccentrically in relation to the core lock 10, whereby the coil spring 41 compressing the bearing 42, 43 together bends enabling eccentricity yet keeping the bearing 42, 43 as one.
A flange 44 at the end of the socket 40 prevents the opening of the bearing 42, 43 when pulling the socket 40 out of the core.

The invention was described above only referring to some of its advantageous embodiments, to the details of which the invention is, however, by no means intended to be narrowly confined.

Claims

1. A core locking device, comprising elements for locking the core locking device into a core of a reel being wound on a carrier-roll winder, which core locking device is located on guides arranged in connection with the winder, which core locking device moves, as the winding proceeds, along the centre of the reel being formed, wherein the core locking device further comprises an elastic element for isolating the motion of the core locking device in the direction of the radius of the reel being formed and wherein, by means of the elastic element, the portion of the core locking device engaged in the forced vibration is minimised.

2. The core locking device of Claim 1, further comprising an axially moving part, which includes a damped pivot releasing a degree of freedom in the direction of the reel radius which pivot is inside the outer diameter of the winding spool of the reel being wound.

3. The core locking of Claim 1 or 2, wherein the elastic element is formed of a ball joint which is located in connection with the axially moving part on the side of a spindle located in the centre of the reel at a distance from the spindle such that the portion of the core locking device engaged in forced vibration, abuts to the ball joint.

4. The core locking device of Claim 3, further comprising elastic and damping elements limiting rotation located in the vicinity of the ball joint on the side of the spindle.

5. The core locking device of Claim 1, further comprising an axially moving part, which includes a damped mechanism releasing the degree of freedom in the direction of the reel radius which mechanism is substantially in the centre line of and/or concentric with the axially moving part.

6. The core locking device of Claim 1 or 2, further comprising a floating core socket arranged in connection with the core locking device, the floating core socket comprising two bearings substantially at a straight angle in relation to each other and a coil spring or equivalent which enables motion and centres the socket.

7. The core locking device according to any one of Claims 1 to 6, further comprising a sturdy body stable in forced vibration.

8. The core locking device according to any one of Claims 1 to 7, further comprising a brake for stiffening the motion of the body of the core locking device.