CN113518752A

CN113518752A - Drive for a coil cutter

Info

Publication number: CN113518752A
Application number: CN201980093292.9A
Authority: CN
Inventors: E.韦申巴赫尔; A.斯坦格勒
Original assignee: Voith Patent GmbH
Current assignee: Voith Patent GmbH
Priority date: 2019-03-05
Filing date: 2019-12-10
Publication date: 2021-10-19
Anticipated expiration: 2039-12-10
Also published as: EP3934997A1; EP3934997B1; DE102019105485A1; EP3934997C0; WO2020177910A1; CN113518752B

Abstract

The invention relates to a method and a device for winding a material web (1) onto a winding drum (2) in a reel cutter after longitudinal cutting of the material web (1) unwound from a parent reel (4) to form a winding reel (3), wherein the parent reel (4) and the winding reel (3) are driven and a web tension between the parent reel (4) and the winding reel (3) is measured. The winding result in the reel-up machine is improved in that the drive (8) of the parent reel (4) or the drive (9, 10) of the winding reel (3) is carried out in such a way that the web tension lies within a predetermined interval as a function of the operating state.

Description

Drive for a coil cutter

The invention relates to a method for winding a material web onto a winding reel in a web cutting machine after longitudinal cutting of the material web unwound from a parent roll to form a winding reel, wherein the parent roll and the winding reel are driven.

The invention also relates to a device for winding a material web unwound from a parent roll onto a winding drum in a roll cutting machine after longitudinal cutting of the material web to form a wound roll, in particular for carrying out the method, comprising two support rollers arranged axially parallel to one another for supporting the wound roll with the formation of two winding gaps, wherein in a first winding gap the material web is guided to the wound roll with at least partial winding of a first support roller, and a second support roller placed downstream of the first support roller in the material web running direction is not wound by the material web, the parent roll and the first support roller each being equipped with a drive with a control unit.

The invention is explained below in connection with the treatment of a paper web. The invention can be used correspondingly in other similarly treated webs. For example, but not exclusively, a web of cardboard, plastic or metal foil is used here.

The paper web is produced in the paper machine in relatively large widths of up to 11m and more. Production is practically carried out almost continuously. The product running direction of a paper machine defines here the longitudinal direction of all the machines and devices in the paper mill and the transverse direction perpendicular thereto in the horizontal plane.

At the end of the paper machine, the resulting paper web is wound onto a reeling core in full width. The reeling core is regularly replaced, typically during continuous production. A winding over the width of the web formed in this way is often referred to as a parent roll or a full cylinder.

For subsequent users, such as printing plants, it is necessary to cut the paper web wound on the parent roll into a plurality of sub-webs extending in parallel, the width of which is adapted to the respective subsequent user. The width may vary a lot from situation to situation, and therefore the division of the web is usually performed according to individually definable cutting dies. The partial web is then wound into a winding reel, which is referred to as a partial web reel or a finished reel and is jointly delivered as a so-called reel group. The cutting die may be different for each coil set. The longitudinal cutting and winding are expediently carried out in a single machine, which is generally referred to as a coil-cutting device.

Common to all winding devices described above, that is to say winding devices for producing parent rolls and winding devices for producing partial webs or finished rolls, is that the web to be wound to form a winding roll forms a winding gap together with at least one winding roller, on which the web is supported or against which it rests and which is therefore referred to as a support roller or idler roller. These take-up rolls, which are in direct contact with the lap being formed, are therefore also direct-acting tools, by means of which the quality of the lap can be influenced.

The main drive of the reel is speed-controllable and determines the speed of the reel cutter, the drive of the parent reel being effected in a torque-controlled manner by means of superimposed web-traction regulation.

In particular, during the unwinding acceleration and braking, fluctuations in the web tension occur, which impair the winding effect. The quality of the revolution of the parent roll is very important here.

The parent roll is quite uneven in specific gravity because it is generally stiffer wound in the core than on the outside. The calculation of the rotating masses and thus the control of the drive torque during acceleration and braking is therefore very inaccurate.

Such machines are described, for example, in the documents DE3030798a1 and DE102010039007a 1.

The invention aims to improve the winding effect in a coil cutting machine.

The invention solves this problem by measuring the web tension between the parent roll and the winding roll and, depending on the operating state, carrying out the drive of the parent roll or the drive of the winding roll such that the web tension is within a predetermined interval.

In this way, fluctuations in the force ratio in the range between unwinding and winding can be reduced. The force proportion in the winding region is therefore stable and reproducible.

Since the web tension changes particularly strongly, for example during acceleration and braking, the drive of the reel takes care of the adjustment of the web tension during acceleration and braking of the unwinding. The drive of the parent roll determines the facility speed here. Also advantageous in peristaltic processes.

Since the weight of the coil is significantly less, the active rotating mass is also significantly less than in the parent coil.

In the case of the production speed of the unwinding, the drive of the parent roll is responsible for the adjustment of the web tension, as was usual and proven appropriate before. The driving of the winding determines the speed of the installation in this operating state.

The parent roll intermittent rotational speed is controllably/adjustably driven and the intermittent torque is controllably/adjustably driven according to or depending on the operating state.

Advantageously, the parent rolls should be driven with a controllable/adjustable rotational speed during the peristaltic progression, during acceleration or braking of the unwinding and with a controllable/adjustable torque in the case of the production speed of the unwinding.

In contrast, the winding is to be driven in a controllable/adjustable manner at least at the main rotational speed.

In this case, it is important for the device that at least one sensor for detecting the tension of the web is arranged between the parent roll and the first idler, which sensor can be connected to a control unit for the drive of the parent roll or a control unit for the drive of the first idler by a machine control, depending on the operating state.

The invention is further illustrated below according to one embodiment. In the drawings:

the figure shows a schematic structure of a coil cutter.

The preferred embodiment of the winding device according to the invention shown in the figures is realized in combination with a web cutting device designed as a idler winding device.

The main components of the reel-up cutting device are an unwinding device 15, in which the paper web 1, whose width corresponds substantially to the working width of the paper machine not shown here and which is placed upstream of the reel-up cutting device, is drawn off from the parent reel 4, a cutting section 17, in which cutting section 17 the paper web 1 is divided longitudinally in its running direction to produce a sub-web with a selectable width format, and a winding device 16 in its winding area.

The parent roll 4 is provided with its own drive 8 with a control unit.

The cutting section 17 comprises for this purpose as a main component a generally disc-shaped cutting device, which is shown here in the form of an interacting upper knife 18 and lower knife 19.

In order to prevent vibrations of the running material web 1 in the region of the cutting section 17, this region is defined by a deflection roller 20 in the example shown.

In addition to the two support rollers 5, 6, at least one coil 3 to be wound and the support roller 21 form the main elements of the winding device 16. Although only the end face of a single reel 3 is visible in the figures, it is considered here that, in the Y-direction extending into the plane of the drawing, the further reel 3 behind the shown reel 3 is located in the winding bed formed by the two support rollers 5, 6.

The windings 3 formed during winding each consist, at their core, of a winding drum 2 to which the starting end of the final section of the partial web of the material web 1 is connected and then bound by continuous winding to form a so-called winding layer.

Two support rollers 5, 6 arranged axially parallel to one another are used to support the winding reel 3 while forming two

winding gaps

11, 12, wherein in the first winding gap 11 the material web 1 is guided to the winding reel 3 while partially winding the first support roller 5 and the second support roller 6, which is disposed downstream of the first support roller 5 in the web running direction 7, is not wound by the material web 1.

The second support roller 6, which forms a second winding gap 12 on the outer circumference of the coil 3 in the direction of rotation of the coil 3, is mechanically coupled to the first support roller 5 via the coil 3 at all times.

The two support rollers 5, 6 are each assigned a drive 9, 10 with a control unit. It has proven to be suitable here if, in the web running direction 7 of the paper web 1, the first idler roller 5 is speed-adjustable and the second idler roller 6 is torque-adjustable, wherein the torque adjustment of the second idler roller 6 takes place independently of the influence of the actual value of the speed of rotation of the first idler roller 5 and the load distribution takes place in such a way that the reel 3 is driven at least predominantly in a speed-adjustable manner.

In order to damp or damp vibrations, the support rollers 5, 6 can have elastic support means.

Likewise, at least one of the two support rollers 5, 6 can have a coating or sheath that acts on the material web 1.

In order to ensure a continuous unwinding and winding process with optimum winding results, it is necessary that the web draw of the material web between unwinding and winding is substantially constant, so that no damage is caused to the material web 1. Winding errors caused by uneven web traction can be reflected, for example, in cracks or folds and can also lead to corresponding collateral damage. But the web traction can vary considerably, especially during acceleration and braking.

Therefore, the unwinding and winding processes must be adapted to each other. For this purpose, the drive 8 of the parent roll 4 and the drives 9, 10 of the idlers 5, 6 are connected to a machine control 14 via their respective control units.

Furthermore, the web tension of the material web 1 between the parent roll 4 and the first idler roller 5 is detected by the sensor 13 and transmitted to the machine unit 14.

A control device is understood here as meaning the entirety of the functional components and their couplings required for performing control and regulation tasks. This includes control devices, regulators, devices for detecting actual values, disturbance variables and regulating devices and their interconnecting devices.

Depending on the operating state, the machine control 14 should ensure that the drive 8 of the parent reel 4 or the drives 9, 10 of the winding reel 3 are implemented such that the web tension lies within a predetermined interval.

For this purpose, depending on the operating state, the machine control 14 connects the sensor 13 to the control unit of the drive 8 of the parent roll 4 or the control unit of the drive 9 of the first idler 5 for higher-level web traction control.

In normal operation, i.e. in the case of the unwinding production speed, the drive 8 of the parent roll 4 is effected by the upper-stage web tension control in a torque-controlled manner, so that the web tension is within a predetermined interval. The drive 9 of the first idler 5 is only speed-adjustable in this case.

In contrast, during the peristaltic process and during the acceleration or braking of the unwinding, the drive 9 of the first idler roller 5 is implemented by means of a higher-order web tension control in the manner of a rotational speed control, so that the web tension is within a predetermined interval. The drive 8 of the parent roll 4 is here only speed-adjustable.

This means that the parent roll 4 is driven intermittently in a speed-regulated manner and intermittently in a torque-regulated manner.

During critical creep, acceleration and braking, the relevant rotating mass is thus essentially determined by the significantly lighter reel 3 than the parent reel 4, which minimizes fluctuations in web tension.

Claims

1. Method for winding a material web (1) onto a winding reel (2) in a reel cutter after longitudinal cutting of the material web (1) unwound from a parent reel (4) to form a winding reel (3), wherein the parent reel (4) and the winding reel (3) are driven, characterized in that the web tension between the parent reel (4) and the winding reel (3) is measured and the driving (8) of the parent reel (4) or the driving (9, 10) of the winding reel (3) is effected depending on the operating state such that the web tension is within a preset interval.

2. Method according to claim 1, characterized in that the drive (9, 10) of the winding (3) is effected during the acceleration or braking of the unwinding, so that the web tension is within a predetermined interval.

3. Method according to claim 1 or 2, characterized in that the drive (9, 10) of the winding (3) is carried out in a peristaltic progression so that the web tension is within a predetermined interval.

4. Method according to one of the preceding claims, characterized in that, in the case of the production speed of the unwinding, the drive (8) of the parent roll (4) is effected such that the web tension is within a preset interval.

5. Method according to one of the preceding claims, characterized in that the parent roll (4) is driven with a controllable/adjustable intermittent rotational speed and with a controllable/adjustable intermittent torque.

6. Method according to one of the preceding claims, characterized in that at least the prevailing rotational speed drives the winding (3) in a controlled/regulated manner.

7. Method according to one of the preceding claims, characterized in that the parent roll (4) is driven with a controllable/adjustable rotational speed during the peristaltic progression, during the acceleration of the unwinding or during the braking of the unwinding.

8. Method according to one of the preceding claims, characterized in that the torque drives the parent roll (4) in a controlled/regulated manner in the case of the production speed of the unwinding.

9. Device for winding a material web (1) onto a winding drum (2) in a reel cutter after longitudinal cutting of the material web (1) unwound from a parent reel (4) to form a wound roll (3), in particular for carrying out the method according to one of the preceding claims, comprising two support rollers (5, 6) arranged axially parallel to one another for supporting the wound roll (3) with the formation of two winding gaps (11, 12), wherein in a first winding gap (11) the material web (1) is guided to the wound roll (3) with at least partial winding of the first support roller (5) and a second support roller (6) placed behind the first support roller (5) in the web running direction (7) is not wound by the material web (1), the parent reel (4) and the first support roller (5) each being equipped with a drive (8, 8) with a control unit, 9),

characterized in that at least one sensor (13) for detecting the tension of the material web is arranged between the parent roll (4) and the first support roller (5), wherein the sensor (13) can be connected to a control unit for the drive (8) of the parent roll (4) or a control unit for the drive (9) of the first support roller by means of a machine control device (14) depending on the operating state.