EP1035052B1 - Linear drive device - Google Patents

Abstract

The linear drive unit for moving a cutter (5) to separate a moving cardboard or paper web (9) near a winding machine is attached to a high-speed lifting device (1) which moves it across the web. Holding devices (2) protect the cutter from the effects of acceleration when it is moved. If the holding devices are disconnected, movement of the cutter is stopped. An Independent claim is included for a drum changing system for use in a continuous paper or cardboard production machine using the drive unit.

Description

The invention relates to a linear drive unit, which is used to move a component, in particular a cutting device. Such a cutting device is used for example in a machine for producing or finishing a fibrous web, e.g. B. Paper or cardboard web, preferably at the end of such a machine in the area of a Winding apparatus. The running fibrous web is cut with the help of the cutting device severed transversely to the direction of web travel, especially if during the running A winding roll created on a first drum has become full and the formation of a new winding roll begins on a second drum ( "Turn-up").

DS 1: DE 27 21 883,

DS 2: US 5 360 179,

DS 3: WO 97/48632,

DS 4: Prospekt "Waterjet Turn-up System" der Firma Beloit Corp.

DS 5: EP 802 139 (nächstliegender Stand der Technik)

DS 6: DE 38 05 164

The following publications are referred to the state of the art:

DS 1: DE 27 21 883,

DS 2: US 5 360 179,

DS 3: WO 97/48632,

DS 4: "Waterjet Turn-up System" brochure from Beloit Corp.

DS 5: EP 802 139 (closest prior art)

DS 6: DE 38 05 164

The linear drive unit known from DS 1 is used to move in opposite directions two cutting devices, each having a circular knife. The linear movement takes place by means of an endless rope, which is driven by means of a friction wheel.

The device known from DS 2 comprises one or two liquid jet cutting devices, which at high speed (10 m / sec) across a running one Fibrous web are moved linearly. Details about the linear actuator are not described.

DS 3 discloses a similar device, the linear drive being one has pneumatic pistons.

According to DS 4, a rodless cylinder serves the same purpose; the lifting speed is approximately 15.3 m / s.

Modern machines for the manufacture or refinement (or other processing) of Fibrous, especially paper webs are getting higher and higher Operating speeds operated. In many cases, working speeds of Desired or already exceeded 2000 m / min. Accordingly, one must start described cutting device also at extremely high speed across Web to be moved. Because with every cutting process at least one becomes diagonal running cutting line, in the area of which the paper is not for sale Committee is incurred. Attempts have always been made to minimize the amount of rejects hold.

In this regard, the present invention aims to achieve an even better result become. In other words: the invention is based on the object, the known To improve linear drive units so that in their application for Moving a cutter of a paper machine even less rejects than so far.

This object is achieved by the linear drive unit specified in claim 1. The invention is based on the knowledge that it is used in some applications Linear drive unit, especially when moving one described above Cutting device, not only depends on an extremely high speed, but that it must also be ensured that this high speed at the start of the Movement is achieved in the shortest possible time. That means it has to be extremely high Acceleration are taken care of. This goal is primarily achieved in that in created a ready position for the linear drive unit according to the invention in which the first high-speed lifting device on the to be moved Component already exerts a high acceleration force in its rest position.

In this state, however, a holding device holds this in accordance with the invention moving component still in its rest position. If now to a selectable When the holding device is released, the high acceleration force acts from on the component to be moved. As a result, the Top speed of the component to be moved reached in a much shorter time than at the known devices. The holding device is preferably a second High-speed lifting device, the two high-speed lifting devices work together in a meaningful way, as described below in individual is described.

As already known, the first high-speed lifting device is preferably a rodless pneumatic cylinder. Its main advantage is that its Length needs to be only slightly larger than the length of the running distance of the to be moved Component. In addition, the mass to be accelerated is very small, which makes it extremely high Acceleration results. In the case of the cutting device of a paper machine, the Length of the movement distance from the width of the web to be cut (Around 10 meters).

If two opposing cutting devices are provided, the length is Running distance only about half the track width. Alternatively to a barless one Pneumatic cylinders could possibly act on the principle of a rocket drive Drive device can be provided.

The second high-speed lifting device is preferably a so-called "Mechanical linear unit" trained, available for example from NEFF Antriebstechnik Automation GmbH. An advantage of this device is that with high acceleration a very high speed of movement is possible and that Acceleration and deceleration phases are easy to control. As a less cheap one Alternatively, a hydraulic cylinder can also be considered, as described below.

The subclaims include further advantageous refinements of the invention and Features of a drum changing system to which the invention is applicable.

Embodiments of the invention are described below with reference to the drawing described.

Figure 1 shows schematically that for two opposing cutting devices provided linear drive units with a first and a second High-speed reciprocating device.

FIG. 2 shows an alternative detail from FIG. 1.

Figure 3 shows schematically a winding machine in side view, with a linear drive unit according to the invention.

In Figure 1 you can see a piece of a running fibrous web 9, which is in the direction arrow P moves. Two cutting devices 5 are provided, in the form of Liquid jet nozzles, which in their rest position in the area of the web center in low Distance from the web 9 are arranged. Their beam direction is approximately vertical to the plane of the drawing, ie essentially perpendicular to the running web 9 or below an angle to the vertical. Cutting fluid is supplied by means of a High pressure pump 10, which has a liquid pressure in the order of up to 2000 bar or can generate more. The pump 10 is via a line system 11 with a switching valve 12 and connected to the cutting devices 5 via high-pressure hose lines 3. Figure 1 shows the state shortly after opening the switching valve 12; the cutting process has just started, the cutting devices 5 still in their rest position are. This initially creates two cutting lines 18, 19 which are parallel to Extend web direction. If a short time later the cutting device 5 in the direction arrows 5a are moved to the web edges, the known diagonal results Section line course (see Fig. 10 of DS 1 or Fig. 8 of DS 3). Deviating from Fig. 1 the cutting devices 5 can also be arranged such that the cross diagonal cutting lines (Fig. 6 of DS 3) or that the cutting devices lie immediately one behind the other (Fig. 7 of DS 3).

Each cutter 5 is mechanically attached to the piston 6 of a rodless one Pneumatic cylinder 1 coupled; this forms the first mentioned in claim 1 High-speed reciprocating device. Each pneumatic cylinder 1 is on one of its both ends via a pressure line 7 (with a large flow cross section) with a Pressure accumulator 8 connected to which a compressed air generator 8a is connected.

One end of the high-pressure hose line 3 is coupled to the cutting device 5, the other end is - for the purpose of connection to the line system 11 - to a fixed one Component 13 coupled. In the preferred embodiment shown, the High-pressure hose line 3 by means of a deflection device 4 by approximately 180 degrees diverted. The deflection device 4, preferably designed as a deflection roller, is on the Movable element 2a of a second high-speed lifting device 2 attached. This is realized in Figure 1 in that the deflection roller 4 is rotatable in a bearing 4a is mounted, which is coupled to the piston rod 2a of a hydraulic cylinder 2.

A preferred alternative to this is shown in FIG. 2. Here is the pulley 4 rotatably supported on the linearly movable element 21, which is part of a is a total of 2 'designated mechanical linear unit. In that it is linear movable element 21 by means of an endless toothed belt 22 (guided over Pulleys 23) coupled to a drive motor 24.

In both variants of the second high-speed lifting device 2 or 2 'is through guiding the hose 3 over the guide roller 4 ensures that when moving one of the cutting devices 5 over the distance a the movable element 2a or 21 only half of this distance, namely the distance b must cover. If you can Hose 3 not only leads over a single deflection roller 4 but (in the manner of a Pulley) over several pulleys, so the ratio of the distances a / b larger than 2.

Figure 1 shows the ready position of the linear drive unit. In each of the In the first two high-speed lifting devices, the piston 6 is on the side of the pressure accumulator 8 already under pressure. The one connected to the piston 6 Cutting device 5 is still operated by the second high-speed lifting device 2 held on the hose 3.

However, as soon as the second lifting device 2 or 2 'is activated, for example by Supply of hydraulic pressure via the line system 14 with the control valve 15, or better by activating the drive motor 24 (in the case of FIG. 2), the cutting device 5 set in motion with high acceleration.

1, the ready position can be such that each of the pistons directly at the end of the pneumatic cylinder 1 (at the connection of the pressure line 7) located. In this case, the cutting devices 5 can intersect intersecting lines generate (Fig. 6 of DS 3). It is also possible that the nozzles 5 only then The high pressure cutting fluid is applied after it has traveled a distance have traveled e.g. B. when it reaches approximately the central area of the paper web to have.

1 and 2, the axes of rotation of the deflection rollers 4 are perpendicular to the paper web 9. However, it is cheaper to make the arrangement such that the axes of rotation of the Deflection rollers 4 are parallel to the paper web 9, so that each of the (second) Lifting devices 2 and 2 '(in the view according to FIG. 1) above the relevant one Cutting device 5 is located. This allows the two cutting devices 5 to be closer can be moved closer together (i.e. the distance c can be reduced).

Essential components of the winding machine shown in Figure 3 are a drivable and horizontally displaceable pressure roller 30 and a drivable drum 31. During a normal winding process, the paper web 9 runs over a guide roller 32 and via the pressure roller 30 onto a winding roll (which is constantly increasing in diameter) 33. This is created by winding the drum 31, with the pressure roller 30 is in contact (dash-dotted state).

The drum 31 together with the winding roller 33 is constantly in accordance with the Increase in diameter - to the right in the view according to FIG. 3 - shifted, e.g. by means of of a spindle drive 34. To prepare a reel change (when the winding roll 33 has almost reached the desired diameter), the drum 31 with the Winding roller 33 away from the pressure roller 30 into that shown in full lines Position. An auxiliary roller 35 presses the incoming web 9 against the winding roll 33. Now a new, still empty reel 36 is inserted into the winding machine.

The new drum is preferably in such a position with the pressure roller 30 brought into contact that the paper web 9 still running to the winding roll 33 the new Wraps around drum 36 a bit; the resulting wrap angle is 8 designated. Preferably in the area labeled 40, that is, between guide roller 32 and pressure roller 30 - or above the pressure roller 30 or between the pressure roller 30 and auxiliary roller 35 - a cutting device is provided, with a top described linear drive unit. You can have a single cutter provide the entire paper web from one web edge to the other Cutting edge of the web or there are two cutting devices according to Figure 1 intended. In any case, it is ensured that the new one formed on the cutting line The beginning of the web is transferred to the new drum 36 so that a new one is formed there Winding roll can begin.

Claims (9)

1. Linear drive assembly having the following features:

   a) the linear drive assembly is used to move a cutting device (5) for the purpose of severing a moving fibrous web (9), in particular paper or board web, preferably in the region of a winder;

   b) the cutting device (5) is coupled to a first high-speed reciprocating device (1) which extends over the fibrous web transversely with respect to the web running direction;

   c) in a standby position of the cutting device (5), from which the cutting operation is to begin, the first high-speed reciprocating device (1) exerts an acceleration force on the cutting device (5);

   d) the cutting device (5) is additionally coupled to a holding device (2; 2') which, in the standby position, holds the cutting device (5) firmly counter to the acceleration force;

   e) the holding device is a second high-speed reciprocating device (2; 2');

   f) the arrangement is made such that releasing the holding device (2; 2') triggers the immediate movement of the cutting device (5) under the action of the aforementioned acceleration force;
   characterized by the following features:

   g) the first high-speed reciprocating device (1) is arranged in such a way that the cutting device (5) coupled to it, during its movement for the purpose of severing the moving fibrous web, is moved transversely with respect to the running direction (P) of the fibrous web;

   h) fixed to the moving element (2a; 21) of the second high-speed reciprocating device (2; 2') is at least one deflection device (4) for a flexible strand (3), whose one end is coupled to the cutting device (5) to be moved and whose other end is held in a fixed location, so that it is under tensile stress in the standby position.
2. Linear drive assembly according to Claim 1, characterized in that the first high-speed reciprocating device (1) is a pneumatic cylinder known per se, preferably one without a rod, whose piston (6) is pressurized in the standby position.
3. Linear drive assembly according to Claim 1 or 2, characterized by the following features:

   a) the cutting device to be moved is a liquid jet cutting device (5) having at least one liquid jet nozzle;

   b) the aforementioned flexible strand (3) is formed as a high-pressure hose line which is used to feed the cutting liquid to the liquid jet cutting device (5).
4. Linear drive assembly according to Claim 1 or 2, characterized in that the cutting device to be moved is part of a laser beam cutting device.
5. Linear drive assembly according to one of Claims 2 to 4, characterized in that the piston (6) of the first high-speed reciprocating device (1) is permanently connected to the interior of a pneumatic pressure reservoir (8).
6. Linear drive assembly according to one of the preceding claims, characterized in that the second high-speed reciprocating device (2') is formed as a mechanical linear unit known per se, whose linear movable element (21) is coupled to a drive motor (24) by means of a toothed belt (22).
7. Linear drive assembly according to one of the preceding claims, characterized in that, with the aid of the aforementioned deflection roller (4), the reciprocating speed or the reciprocating acceleration of the first high-speed reciprocating device (1) is at least 2 times the reciprocating speed or the reciprocating acceleration of the second high-speed reciprocating device (2; 2').
8. Reel-change system for a continuously operating paper or board production or conversion machine, having two cutting devices (5) moving in opposite directions, characterized in that there are two linear drive assemblies according to one of Claims 1 to 7 acting in opposite directions.
9. Reel-change system according to Claim 8, characterized in that the cutting devices (5) are constructed as high-pressure liquid jet nozzles for liquid pressures in the range from 1000 to 2000 bar or more.

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