CN113795445B

CN113795445B - Uncoiling station

Info

Publication number: CN113795445B
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: 2023-10-10
Anticipated expiration: 2040-02-20
Also published as: EP3962848B1; DE102019111470A1; DE102019111470B4; EP3962848C0; CN113795445A; EP3962848A1; WO2020224820A1

Abstract

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

Description

Uncoiling station

Technical Field

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 reel being journalled in a journal bearing with a rotatable outer ring, the device having a main unwind, a secondary unwind and an adhesive and breaking device, wherein the main unwind and the secondary unwind each have two running surfaces extending parallel to each other and contacting corresponding mating surfaces of the rotatable outer ring of the journal bearing for the movement of the reel from the main unwind to the secondary unwind.

Background

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 calender.

The known unwinding station comprises a primary unwinding device and a secondary unwinding device for guiding the reel. The complete reel is first guided by the main unwinder during unwinding of the web of material. From the desired diameter of the reel, the reel is transferred from the primary unwinder to the secondary unwinder.

The new, complete reel is then fed to the main unwinder and the web wound on the new, complete reel is connected to the web unwound from the reel guided by the secondary unwinder before the reel guided by the secondary unwinder is completely unwound. For this purpose, a bonding device is provided, which generally has a bonding roller rotatable about an axis, by means of which the web unwound from the reel guided by the secondary unwinder is fed to a subsequent web handling machine (seen in the direction of travel of the web). In order to connect the two webs to each other, the bonding roller is turned around and pressed onto a reel guided by a main unwinder. At the same time, the web of material unwound from the reel guided by the secondary unwinding device is cut off by means of a cutting device.

In another device for unwinding webs of web material known from document EP 1 798 172, the reels, after unwinding, are cut longitudinally by one or more cutting devices and separated into individual webs, in order to then be wound onto a reel sleeve to form a so-called delivery reel.

For this purpose, a back-up roll winder or a carrier roll winder is used, for example. The idler winder has two driven idlers on which the drums are supported side by side in sleeve alignment during winding. The idler winder has a roll ejection device which ejects a set of wound rolls from a roll bed formed by two idlers when changing rolls. The produced reel group is pressed by the ejector device beyond the top of the carrier roller onto the descent table.

For the transfer from the main unwinder to the secondary unwinder, for example, pivot arms pivotable about an axis are used which act on both sides of the reels and transfer them to the secondary unwinder by means of a pivot motion.

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

Disclosure of Invention

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

According to the invention, the above-mentioned object is achieved in that the axial positions of the running surfaces of the primary and secondary unwinding devices are adjustable or settable and in that the respective running surfaces of the primary and secondary unwinding devices are directly adjacent to each other.

The construction is significantly simplified by eliminating the transport means present between the primary and secondary unwinders.

Empirically, the axial position of the outer rings of the journals of the two drums, which are designed as cylindrical sleeves, can deviate from each other by 75mm or more.

The exact, axially adjusted further guidance of the unwound material web is ensured by the axial displaceability of the positions 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 extend horizontally or are slightly inclined in the transport direction.

The horizontal movement of the winding drum on the running surface is in this case mostly supported by linear slides.

The running surfaces of the primary and secondary unwinding devices and the corresponding counter surfaces of the rotatable outer ring of the journal bearing have a shape that axially guides the corresponding 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 winding drum is guided in the primary unwinding device and in the secondary unwinding device on two running rails extending parallel to one another, respectively.

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

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

Drawings

The invention is further illustrated below in terms of a number of examples. In the accompanying drawings:

fig. 1 to 5: the device for unwinding reels 2, 3 of web material 1 is schematically shown in side view in different stages of the unwinding process, respectively;

fig. 6 shows a side of the unwind device;

fig. 7 shows the outer ring 10 to be guided of the journal bearing 15 of the reels 2, 3 according to fig. 6, and

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

Detailed Description

In a device with two unwinders 5, 6 for unwinding reels 2, 3, during the unwinding according to fig. 1, the web 1 is unwound from a full reel 2 in the main unwinder 5 by means of a first drive.

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 means of the second drive 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 small torque in order to be able to unreel the material web 1 from the reel 3 in the secondary unreeling device 6.

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

The drive means may be designed to be stationary or moving. The unwound material web 1 can be deflected on one or more deflection rolls 9 to stabilize the web run.

In a further step, which is shown in fig. 2, the material web 1 is separated by means of an adhesion and breaking device 7 shortly before it is unwound from the reel 3, in order to connect the end of the material web 1 with the beginning of the material web 1 of the full reel 2. As shown in fig. 3, the reel 3 is thereby now ready to be lifted from the secondary unwinder 6.

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

Also according to fig. 5, a new reel 4 is introduced into the main unwinding device 5 where the reel 2 was located before. The same unwinding process as described above is then performed.

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

In addition to the known and described unreeling processes, it is of course also possible to implement a supplementary unreeling process with the device. Such a supplementary unreeling process occurs, for example, when the facility is to be restarted after a long maintenance shutdown.

After the unwinding device, the material web 1 is separated into a plurality of individual webs of settable width by means of known cutting elements, not shown. These single webs are then wound onto a sleeve stack 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 stationary support of the primary 5 or secondary 6 unwinder. This prevents the roll 1 from moving axially during unwinding and also prevents the roll 1 from moving axially when cutting the web and rewinding the sub-web.

According to fig. 6 to 8, this support is realized in that: in the main unwinding device 5 and in the secondary unwinding device 6, the rotatable outer ring 10 of the journal bearing 15 of the reels 2, 3 is guided in each case on two running surfaces 12 in the form of running rails which run parallel to one another and extend horizontally.

In order to minimize the effort, the respective running surfaces of the primary and secondary unwinders 5, 6 are directly adjacent, i.e. without further units in between. In this case, it is important for a smooth transfer of the reels 2, 3, independently of their position, that the axial positions of the running surfaces 12 of the primary and secondary unwinders 5, 6 are settable.

For the axial guidance of the reels 2, 3, the outer ring 10 of the journal bearing 15 of the reels 2, 3 each has a circumferential groove 13 according to fig. 7 which is complementary to the running track, in which complementary circumferential grooves 13 the respective running track of the primary or secondary unwinder 5, 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 vary slightly between the reels 2, 3, the axial position of the support, in particular of each running rail of the two unwinding devices 5, 6, may be adjusted axially individually to suit the situation of the respective reel 2, 3.

The outer ring 10 of the journal bearing 15 can thus slide or preferably roll on the running track 12 within the unwinding devices 5, 6, which significantly simplifies the transfer of the reel 2 from the primary unwinding device 5 into the secondary unwinding device 6.

Contrary to the embodiments described so far, the outer ring 10 of the journal bearing 15 of fig. 8 has in each case a circumferential ring 8, which circumferential rings 8 protrude into corresponding complementary grooves 11 of the running surfaces 12 of the unwinding devices 5, 6 and thus ensure the necessary axial guidance.

Claims

1. An apparatus for unreeling a material web (1) from a reel (2, 3) for a subsequent machine unit for processing the material web (1), whose journal (14) is supported in a journal bearing (15) with a rotatable outer ring (10), with a main unwinder (5), a secondary unwinder (6) and an adhering and severing device (7), wherein the main unwinder (5) and the secondary unwinder (6) each have two running surfaces (11, 12) which extend parallel to one another and which are in contact with the respective mating surfaces of the rotatable outer ring (10) of the journal bearing (15) of the reel (2, 3) for the movement of the reel (2, 3) from the main unwinder (5) to the secondary unwinder (6), characterized in that the axial positions of the running surfaces (12) of the main unwinder (5) and the secondary unwinder (6) are settable and the running surfaces (12) of the main unwinder (5) and the secondary unwinder (6) are directly adjacent to one another.

2. The apparatus according to claim 1, characterized in that the running surfaces (12) of the primary (5) and secondary (6) unwinders and the respective mating surfaces of the outer rings (10) of the journal bearing (15) have a shape axially guiding the respective outer ring (10).

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

4. Device according to claim 1 or 2, characterized in that the running surface (12) of the primary (5) and/or secondary (6) unwinders is designed as a running track.

5. An apparatus according to claim 4, characterized in that the running rails project into complementary circumferential grooves (13) of the respective outer ring (10) of the journal bearing (15).

6. The apparatus according to claim 1 or 2, characterized in that the outer rings (10) of the journal bearing (15) each have a circumferential ring (8) which projects into complementary grooves of the respective running surfaces (12) of the primary (5) and/or secondary (6) unwind.

7. An apparatus according to claim 1, characterized in that the material web (1) is a paper or board web.