CN113795445A

CN113795445A - Uncoiling station

Info

Publication number: CN113795445A
Application number: CN202080033018.5A
Authority: CN
Inventors: M·沃尔法特; A·埃伯利; M·迈尔; H·伊伦伯格; N·沃思; F·施密特; E·韦申巴赫尔
Original assignee: Voith Patent GmbH
Current assignee: Voith Patent GmbH
Priority date: 2019-05-03
Filing date: 2020-02-20
Publication date: 2021-12-14
Anticipated expiration: 2040-02-20
Also published as: EP3962848A1; DE102019111470A1; EP3962848B1; CN113795445B; WO2020224820A1; EP3962848C0; DE102019111470B4

Abstract

The invention relates to a device for unwinding a material web (1), in particular a paper or cardboard web, from a reel (2, 3) for a subsequent machine unit for processing the material web (1), having a primary unwinding device (5), a secondary unwinding device (6) and a bonding and severing device (7), wherein the primary unwinding device (5) and the secondary unwinding device (6) each have two running surfaces (11, 12) which extend parallel to one another and which come into contact with corresponding mating surfaces of a rotatable outer ring (10) of a journal bearing (15) for moving the reel (2, 3) from the primary unwinding device (5) to the secondary unwinding device (6). The structural complexity is to be reduced in that the axial positions of the running surfaces (12) of the primary unwind (5) and the secondary unwind (6) are settable and the respective running surfaces (12) of the primary unwind (5) and the secondary unwind (6) are directly adjacent to each other.

Description

Uncoiling station

The invention relates to a device for unwinding a material web, in particular a paper or cardboard web, from a reel, for a subsequent machine unit for processing the material web, the journal of the reel being supported in a journal bearing having a rotatable outer ring, having a primary unwinding device, a secondary unwinding device and a bonding and severing device, wherein the primary and secondary unwinding devices each have two running surfaces which extend parallel to one another and are in contact with corresponding mating surfaces of the rotatable outer ring of the journal bearing for the movement of the reel from the primary unwinding device to the secondary unwinding device.

Unwinding stations of the kind described herein are known. They are used to unwind a web of material continuously from a reel and are preceded by a machine for processing the web of material, such as a coater or a calender.

The known unwinding station comprises a primary unwinding device and a secondary unwinding device, which are used to guide the reels. The completed reel is first guided by the main unwind during unwinding of the web of material. From the desired diameter of the reel, the reel is transferred from the primary unwind onto the secondary unwind.

A new, complete reel is then fed to the primary unwind, and the web of material wound on the new, complete reel is connected to the web of material unwound from the reel guided by the secondary unwind before the reel guided by the secondary unwind is completely unwound. For this purpose, a bonding device is provided, which usually has a bonding roller that can rotate about an axis, by means of which the material web unwound from the reel guided by the secondary unwinding device is fed to a subsequent material web processing machine (viewed in the direction of travel of the material web). In order to connect the two webs to one another, the adhesive roller is rotated and pressed onto a reel guided by a main unwind. At the same time, the material web unwound from the reel guided by the secondary unwinding device is cut by means of a shearing device.

In another device for unwinding a web of rolls, which is known from document EP 1798172, the rolls are cut longitudinally and separated into individual webs after unwinding by one or more cutting devices in order to then be wound onto a roll sleeve to form a so-called delivery roll.

For this purpose, for example, supporting roller winders or idler winders are used. The idler winder has two driven idlers on which the reels are supported side by side with the sleeves aligned during winding. Idler winders have a reel ejection device which ejects a set of wound reels from a bed of two idlers during a reel change. Here, the manufactured reel set is pressed by the push-out device over the top of the idler onto the lowering platform.

For the transfer from the primary unwind into the secondary unwind, use is made, for example, of a pivoting arm pivotable about an axis, which acts on both sides of the reels and transfers these to the secondary unwind by means of a pivoting movement.

Since the reels differ slightly from each other in the axial position of the wound material web, great problems often arise.

The object of the invention is therefore to reduce the effort required for unwinding the material web.

The above-described object is achieved according to the invention in that the axial positions of the running surfaces of the primary and secondary uncoilers are adjustable or settable and the corresponding running surfaces of the primary and secondary uncoilers directly adjoin one another.

The structure is significantly simplified by eliminating the transfer devices present between the primary unwind and the secondary unwind.

As a rule of thumb, the axial positions of the journals of the two drums, which are designed as outer rings of cylindrical sleeves, can deviate from each other by up to 75mm or more.

The accurate, axially adjusted further guidance of the unwound material web is ensured by the axial disposability of the position of the support of the primary and secondary unwinders.

The transport of the reels is simplified if the running surfaces of the primary and secondary unwinders run horizontally or are slightly inclined in the transport direction.

The horizontal movement of the drum on the running surface is supported here mostly by linear slides.

In this case, the running surfaces of the primary and secondary uncoilers and the corresponding mating surfaces of the rotatable outer ring of the journal bearing have the shape of an axially guided outer ring.

For simple guidance from the primary unwinding station to the secondary unwinding station, it is advantageous if the outer ring of the journal bearing of the reel is guided in the primary unwinding station and in the secondary unwinding station on two running rails extending parallel to each other, respectively.

In order to ensure the axial guidance of the reel during its movement on the running track, the outer rings of the journal bearing of the reel should each have a complementary circumferential groove into which the respective running tracks of the primary and secondary uncoilers project.

In this case, it is alternatively advantageous if the outer ring of the journal bearing each has a circumferential ring which projects into complementary grooves of the respective running surface of the primary uncoiler and/or of the secondary uncoiler.

The invention is further illustrated below with reference to a number of examples. In the drawings:

fig. 1 to 5: schematically showing side views of the device for unwinding

rolls

2, 3 of a material web 1, respectively, in different stages of the unwinding process;

FIG. 6 shows the side of the unwinding device;

fig. 7 shows the outer ring 10 to be guided of the journal bearing 15 of the

reel

2, 3 according to fig. 6, and

fig. 8 shows different possibilities for guiding the outer ring 10 of the journal bearing 15 axially in the primary unwind 5 as well as in the secondary unwind 6.

In an arrangement with two

unwinding devices

5, 6 for unwinding the

reels

2, 3, the material web 1 is unwound from the full reel 2 in the main unwinding device 5 by a first drive during the unwinding process according to fig. 1.

Simultaneously with the reel 2 which is still full (full roll, "parent roll"), the reel 3 which has been substantially unwound is unwound in the secondary unwinding device 6 by the second drive device up to the end of the material web 1.

The power of the second drive is dimensioned such that its drive motor is just sufficient to generate a low torque in order to be able to unwind the material web 1 remaining on the reel 3 in the secondary unwinding device 6.

In contrast to the second drive, the first drive is dimensioned in terms of its power such that its torque is sufficient to unwind the material web 1 from the still full reel 2, which has a diameter of, for example, 3500mm and more.

The drive device can be designed to be stationary or to be movable. The unwound web 1 can be deflected on one or more deflecting rollers 9 to stabilize the web run.

In a further step, shown in fig. 2, shortly before the web 1 is unwound from the reel 3, it is separated by a splicing and severing device 7 in order to join the end of the web 1 with the start of the web 1 of a full reel 2. As shown in fig. 3, the reel 3 is thus now ready to be lifted from the secondary unwind 6.

The reel 2 is then moved into the secondary unwind 6 according to fig. 4. The reel 2 is then unwound to the end in the secondary unwinding device 6 where the reel 3 was originally located.

Simultaneously according to figure 5, a new reel 4 is introduced into the primary unwinding device 5 in which the reel 2 was previously located. The same unwinding process as described above is followed.

During the entire process, the web tension is adjusted, which suppresses winding defects.

In addition to the known and described unwinding process, it is of course also possible to implement a supplementary unwinding process with the device. Such a supplementary unwinding process is present, for example, when the installation is to be restarted after a long maintenance outage.

After the unwinding device, the material web 1 is divided into a plurality of individual webs of a settable width by means of known cutting devices, not shown. These singles are then wound onto a set of sleeves located in a roll bed to form a delivery roll.

During unwinding of the material web 1, the

reels

2, 3 are axially fixed in a fixed support of the primary unwinding device 5 or the secondary unwinding device 6. This prevents the material roll 1 from moving axially during unwinding and also prevents the material roll 1 from moving axially when cutting the web and rewinding the sub-web.

According to fig. 6 to 8, this support is achieved in that: in the primary unwind 5 and the secondary unwind 6, the rotatable outer ring 10 of the journal bearing 15 of the

reels

2, 3 is guided on two running surfaces 12 in the form of mutually parallel and horizontally extending running tracks, respectively.

In order to minimize the effort, the respective running surfaces of the primary unwind 5 and the secondary unwind 6 are directly adjacent, i.e. without other units in between. In this case, it is important for a smooth transfer of the

reels

2, 3 independent of their position that the axial position of the running surfaces 12 of the primary unwind 5 and the secondary unwind 6 is settable.

For the axial guidance of the

reels

2, 3, the outer rings 10 of the journal bearings 15 of the

reels

2, 3 each have a circumferential groove 13, which is complementary to the running track, according to fig. 7, in which complementary circumferential groove 13 the corresponding running track of the primary unwinding device 5 or of the secondary unwinding device 6 engages.

In order to prevent the journal 14 from moving along the running track, in particular during unwinding, the journal 14 or the journal bearing 15 is respectively supported in a receiving fork or the like.

Since the position and width of the wound web 1 may differ slightly between the

reels

2, 3, the axial position of the support, in particular of each running track of the two

unwinders

5, 6, can be adjusted axially individually to suit the conditions of the

respective reel

2, 3.

The outer ring 10 of the journal bearing 15 can thus slide or preferably roll on the running rails 12 in the

unwinding devices

5, 6, which considerably simplifies the transfer of the reel 2 from the primary unwinding device 5 into the secondary unwinding device 6.

In contrast to the previously described exemplary embodiments, the outer rings 10 of the journal bearing 15 of fig. 8 each have a circumferential ring 8, which circumferential ring 8 projects into a corresponding complementary groove 11 of the running surfaces 12 of the

uncoilers

5, 6 and thus ensures the necessary axial guidance.

Claims

1. An apparatus for unwinding a material web (1), in particular a paper or cardboard web, from a reel (2, 3) for a subsequent machine unit for processing the material web (1), the journal (14) of the reel being supported in a journal support (15) having a rotatable outer ring (10), the apparatus having a primary unwinding (5), a secondary unwinding (6) and a bonding and severing device (7), wherein the primary unwinding (5) and the secondary unwinding (6) each have two running surfaces (11, 12) extending parallel to one another and contacting corresponding mating surfaces of the rotatable outer ring (10) of the journal support (15) of the reel (2, 3) for the movement of the reel (2, 3) from the primary unwinding (5) to the secondary unwinding (6), characterized in that the axial position of the running surfaces (12) of the primary unwind (5) and the secondary unwind (6) is settable and in that the respective running surfaces (12) of the primary unwind (5) and the secondary unwind (6) are directly adjacent to each other.

2. An apparatus according to claim 1, characterized in that the running surfaces (12) of the primary unwind (5) and the secondary unwind (6) and the corresponding mating surfaces of the outer ring (10) of the journal bearing (15) have a shape that axially guides the corresponding outer ring (10).

3. An apparatus according to claim 1 or 2, characterized in that the running surfaces (11, 12) of the primary unwind (5) and the secondary unwind (6) extend at least substantially horizontally.

4. Device according to one of the preceding claims, characterized in that the running surface (12) of the primary unwind (5) and/or the secondary unwind (6) is designed as a running track.

5. The device according to claim 4, characterized in that the running track extends into a complementary circumferential groove (13) of the respective outer ring (10) of the journal bearing (15).

6. The device as claimed in one of claims 1 to 4, characterized in that the outer ring (10) of the journal bearing (15) has a circumferential ring (8) which projects into a complementary groove (11) of the respective running surface (12) of the primary unwinding device (5) and/or of the secondary unwinding device (6).