WO2014166857A1

WO2014166857A1 - Godet roll

Info

Publication number: WO2014166857A1
Application number: PCT/EP2014/056907
Authority: WO
Inventors: Michael SCHRÖTER; Jan Fenger; Dirk Zenzen; Thomas SPOJDA
Original assignee: Oerlikon Textile Gmbh & Co. Kg
Priority date: 2013-04-09
Filing date: 2014-04-07
Publication date: 2014-10-16
Also published as: CN105121721A; JP2016519726A; CN105121721B; EP2984219A1; JP6305516B2

Abstract

The invention relates to a godet roll for guiding synthetic threads in a melt spinning process. The godet roll has a cylindrical roll casing that is rigidly connected to a projecting end of an input shaft. The input shaft is rotatably mounted in a bearing housing, wherein sealing means for sealing bearing surroundings are provided between said bearing housing and said rotatable roll casing. In order to prevent abraded particles from penetrating into and lubricant from leaking out of the bearing space, according to the invention the sealing means are formed by an end face seal between the roll casing and the bearing housing and by a shaft seal between the input shaft and the bearing housing.

Description

Galette

The invention relates to a godet for guiding synthetic threads in a melt spinning process according to the preamble of claim 1.

In the production of synthetic yarns in a melt spinning process, it is well known that the yarns for drawing, heating and drawing are passed through godets. The godets have a driven roller shell, on the circumference of the threads are guided. For driving the roller shell this is connected to a drive shaft which is rotatably mounted in a bearing housing and is preferably coupled to a drive an electric motor.

It is furthermore known that the godets, in particular, are exposed to the roll mantles of the godets directly to the yarn environment. Depending on the place of use and on the manufacturing process, increased concentrations of volatile constituents of the filament may occur. Such volatile components may contain both lint and preparation fluids. In order to avoid the penetration of such components in particular in the storage environment of the drive shaft, it is customary to arrange a sealant between the roller shell and the bearing housing. For this purpose, basically different types of sealing are known in the prior art. Thus, in the Chinese Utility Model CN 2903108 Y proposed to seal the storage environment by means of an end seal between the roller shell under a bearing housing attached to the retaining ring against the thread environment. In contrast, from DE 21 00 567 AI a godet assembly is known in which the roller casing is assigned to the circumference of a sealing ring, so that already the penetration of the components is prevented in the interior of the godet casing.

Regardless of whether the sealant is formed by an outer seal or an inner seal on the roller shell, due to energetic reasons, a caused by the sliding contact of the sealant braking effect on the roller shell to minimize. On the other hand, it must be ensured that no abrasion parts of the sealant generated by the sliding contact reach the area around the bearing.

It is therefore an object of the invention to provide a galette for guiding synthetic threads of the generic type, in which the storage environment inside the godet is securely sealed against a thread environment on the godet.

This object is achieved in that the sealing means is formed by an end face seal between the roller shell and the bearing housing and by a shaft seal between the drive shaft and the bearing housing.

Advantageous developments of the invention are defined by the features and feature combinations of the respective subclaims.

The invention is characterized in that the storage environment within the bearing housing is separated from both the thread environment and the inner of the roll shell. This can on the one hand possible Abrasive components of the face seal do not get into the storage environment. On the other hand, it has been found that the rotating roller shell generates a negative pressure in the interior, the suction effect of which can adversely affect the storage environment. As a result, in particular the lubricants necessary for storage can emerge from the storage environment. Due to the shaft seal between the drive shaft and the bearing housing, the formation of a suction flow in the storage environment can be advantageously avoided. In order to obtain uniform sealing effects in the face seal independent of a centrifugal force, is provided according to an advantageous development that the face seal is formed as a mechanical seal between an end-side sealing surface of the roll shell and an axially opposite retaining groove on the bearing housing. Insofar, a mechanical seal can be realized in which the roller shell is moved with its sealing surface relative to the friction ring seal.

To achieve the lowest possible differential speeds on the mechanical seal, the sealing surface is preferably formed on a hub of the roller mantle, by which the roller shell is held on the circumference of the drive shaft.

In this case, the mechanical seal preferably has a sliding ring with a retaining bead and an angularly formed on the retaining bead sealing lip. The elastic sealing lip ensures constant contact with the sealing surface of the roll shell.

In order to keep the frictional resistance of the sealant against the rotating parts as low as possible, is the development of the invention The invention particularly advantageous in which the shaft seal is formed without contact. Thus, the shaft seal can be advantageously formed by a fixed metal ring which protrudes into a sealing groove without contact. The metal ring and the seal groove lead to a kind of labyrinth seal with a plurality of sealing gaps, wherein as possible a contact between the metal ring and the seal groove is avoided.

The metal ring can be optionally arranged on the circumference of the drive shaft or in a bearing bore of the bearing housing. Accordingly, the seal groove is formed in the bearing bore of the bearing housing or at the periphery of the drive shaft.

The sealing effect in the sealing gap can preferably be further improved by the sealing gap is preferably filled with a sealing medium with a grease.

In order not to influence the sealing effect, in particular of the shaft seal, by impermissible imbalances on the roller casing, it is usual for the drive shaft to be balanced with the mounted roller casing by means of a balancing device. It is to ensure a clamping of the drive shaft and the roller shell. These requirements are met in particular by the development of the invention, in which the roller shell is formed at the ends of a hollow cylinder and in which the projecting end of the roll mantle is closed by a funnel-shaped lid insert, wherein the lid insert is secured to the end of the drive shaft. So on the one hand ensures a seal of the storage environment against the thread environment and on the other hand, the end of the drive shaft remains accessible. In order to be able to form a compact unit as possible, it is provided that the drive shaft is connected directly to an electric motor which is integrated in the bearing housing. In order to operate the storage of the drive shaft and as a sealant in a permissible temperature range, the development of the invention is provided, in which the bearing housing in the region of the electric motor and in the storage area of the drive shaft has a circumferential cooling channel for receiving a cooling liquid. This allows the heat absorbed by the bearing housing continuously dissipate.

For storage of the drive shaft, a plurality of roller bearings are preferably arranged in the bearing housing, each containing a bearing grease. This ensures a continuous operation of the godet without additional supply of other lubricants.

Since not only volatile constituents of the threads occur in the thread environment but also flying thread ends of broken threads can occur, the development of the invention is particularly advantageous, in which the bearing housing has a retaining flange at the end of the roll jacket, which surrounds the end of the roll jacket Has cover ring. Thus, the parting line formed between the rotating roller shell and the bearing housing is covered with respect to the thread environment. The collapse and wrapping of a thread inside the roll mantle is thus avoided.

The galette according to the invention for guiding synthetic threads in a melt spinning process is therefore particularly suitable for being very strong loaded thread environments can be used. The penetration of foreign parts into the storage environment of the godet as well as the leakage of lubricants from the storage environment out is not possible. In that regard, the godet invention is also for very high peripheral speeds with drive speed up to 16,000 U / min. suitable.

The godet according to the invention is explained in more detail below with reference to some embodiments with reference to the accompanying figures. They show:

Fig. 1 shows schematically a cross-sectional view of a first embodiment of the godet according to the invention

FIG. 2 is a schematic cross-sectional view of the sealant of the embodiment of FIG. 1. FIG

Fig. 3 shows schematically a cross-sectional view of another embodiment of the godet according to the invention

In Fig. 1, a cross section of a first embodiment of the godet according to the invention is shown schematically. The embodiment of the godet according to the invention has a cylindrical roller shell 3, which is rotatably held on an inner hub 4 on the circumference of a projecting end of a drive shaft 2. The drive shaft 2 is supported rotatably within a bearing housing 1 by a plurality of bearings 5.1 and 5.2. For this purpose, the bearing housing 1 has a multi-stage bearing bore 20. In the central portion of the bearing bore 20, the bearings 5.1 and 5.2 are held between the drive shaft 2 and the bearing housing 1. The drive shaft 2 is coupled to the bearing end with an electric motor 21. The electric motor 21 is in an enlarged portion of the storage bore 20 integrated in the bearing housing 1. The electric motor 21 is operated via a supply line 25.

The bearing housing 1 has in the region of the electric motor 21 and in the region of the bearings 5.1 and 5.2 on a spirally encircling cooling channel 22 which is connected to a cooling circuit, not shown here. In that regard, the bearing housing 1 can be cooled by a cooling liquid in the interior of the cooling channel 22. In order to sealingly separate a yarn environment, which is on the circumference of the roll mantle 3, from a storage environment essentially defined by the bearing bore 20, the exemplary embodiment has a sealing means in the form of an end face seal 6 and a shaft seal 7. The end face seal 6 is formed between a front-side sealing surface 9 of the hub 4 and an opposite retaining groove 10 on the bearing housing 1. The shaft seal 7 is formed in a roller jacket 3 associated portion of the bearing bore 20 between the bearing housing 1 and the drive shaft 2. For explaining the end face seal 6 and the shaft seal 7, reference is additionally made to FIG. 2.

2, a section of the bearing housing 1 in the region of the sealing means is shown schematically. The following description thus applies to both figures.

The bearing housing 1 has a projection 28 which protrudes relative to a retaining flange 27 and extends into the roller shell 3 with a short distance up to an end face of the hub 4. On the front side of the projection 28, the retaining groove 10 is formed to receive a sliding ring 8. Of the Slide ring 8 is held in the retaining groove 10 via a holding bead 11. At the retaining bead 11 an angularly outwardly directed sealing lip 12 is arranged, which abuts with a free end on the frontal sealing surface 9 of the hub 4. Between the sealing lip 12 and the retaining bead 11, the sliding ring 8 has a peripheral circumferential groove 13. The circumferential groove 13 is particularly suitable for absorbing and discharging liquids in particular when the roller casing 3 is not driven.

The shaft seal 7 formed between the drive shaft 2 and the bearing housing 1 is formed without contact in this embodiment and by a metal ring 17 secured to the circumference of the drive shaft 2 and a sealing groove 18 formed in the first portion of the bearing bore 20. The sealing groove 18 is formed in this embodiment by a further step of the bearing bore 20 and a sleeve 24 held in the bearing bore 20. The metal ring 17 is guided with little play substantially contactless in the sealing groove 18. Between the sealing groove 18 and the metal ring 17, the sealing gaps 19.1, 19.2 and 19.3 set. In this exemplary embodiment, the sealing gaps 19.1, 19.2 and 19.3 are at least partially filled with a blocking medium 23. As a blocking medium 23 in this case preferably a fat is used.

As is apparent from the illustration in Fig. 1, a cover ring 26 is fixed to the retaining flange 27 of the bearing housing 1, which covers a projecting between the roller shell 3 and the bearing housing 1 parting line 29 with a projecting end. The cover ring 26 prevents the collapse and wrapping of a thread in the parting line 29 between the roller shell 3 and the bearing housing. 1 The roller casing 3 is formed as a hollow cylinder at the projecting end and closed with a lid insert 14. The lid insert 14 is funnel-shaped and fastened via a fastening element 16 at the end of the drive shaft 2. Between the roller casing 3 and the lid insert 14, a sealing ring 15 is clamped, which seals the interior of the roller casing 3 with respect to the thread environment.

In operation, the embodiment of the godet shown in Fig. 1 is used to guide one or more threads on the circumference of the roll shell 3 with at least a Teilumschlingung. In this case, the roller shell 3 is driven via the drive shaft 2 by the electric motor 21 at a predetermined peripheral speed. The peripheral speed of the roll shell 3 depends on the desired yarn speed, for example, in the range of 4,000 - 6,000 m / min. could lie. Depending on diameter, drive speeds in the range of 16,000 rpm. be achieved.

In order in particular to separate the contaminated components such as, for example, the flow and the preparation fluid contaminated environment with respect to the existing inside the bearing housing storage environment acts between the hub 4 of the roller shell 3 and the bearing housing 1, a mechanical seal 8. At the rotating with the roller shell 3 sealing surface 9 is the sealing lip 12 of the seal ring 8 and thus prevents ingress of volatile components inside the bearing housing. Since a negative pressure is generated in particular in the interior of the roller shell 3 by the rapid rotation and this would produce an undesirable air flow in the region of the electric motor 21 due to the open construction of the bearing housing 1, the bearing environment is shielded by the shaft seal ring 7 against the roller shell 3. Here, the meter rotates tallring 17 with the drive shaft 2. The metal ring 17 is guided substantially contactless in the seal groove 18.

The combination of a contacting mechanical seal 8 and a non-contact shaft seal 7 in particular energy losses in the drive of the roll shell 3 are minimized. In addition, it can be prevented that possible abrasion particles of the sliding seal can pass unhindered into the situation environment. The funnel-shaped lid insert 14, which is funnel-shaped on the projecting end of the roll mantle 3, forms a particular advantage in order to enable balancing of the drive shaft 2 with the roll mantle 1 during operation. Thus, the drive shaft 2 can be advantageously used on the projecting end for receiving balancing weights.

The funnel-shaped lid insert 14 at the free end of the roll mantle 3 also has the advantage that no deposits can form which lead to undesired imbalance phenomena. During rotation, all accumulated components are ejected from the deck insert 14.

In Fig. 3, another embodiment of the godet according to the invention is shown schematically in a cross-sectional view. The embodiment is essentially identical to the embodiment of FIG. 1, so that at this point only the differences will be explained and otherwise reference is made to the above description.

In the embodiment shown in FIG. 3, the mechanical seal 8 between the retaining flange 27 of the bearing housing 1 and the frontal side end of the roll shell 3 is formed. For this purpose, the front end of the roller shell 3 is designed with a sealing surface 9 which cooperates with a held in a retaining groove 10 slide ring 8. The sliding ring 8 is identical to the embodiment of FIG. 1 executed. Thus, a sealing lip is in contact with the front-side sealing surface 9 of the roll shell 3.

The shaft seal 7 between the drive shaft 2 and the bearing housing 1 is also formed in a bore section of the bearing bore 20. In this embodiment, a metal ring 17 is held in the bearing bore 20 of the bearing housing 1 and protrudes with an inner diameter in a circumferential seal groove 18 of the drive shaft 2. The seal groove 18 on the circumference of the drive shaft 2 is formed by a shaft ring 30, which at the periphery of the drive shaft. 2 is held. The metal ring 17 is guided without contact in the sealing groove 18, so that at least one sealing gap in the groove base and on the flanks of the sealing groove 18 is generated.

The function of the embodiment of FIG. 3 is identical to the function of the embodiment of FIG. 1, so that no further explanation at this point.

The sealing means shown in the embodiments of FIGS. 1 and 3 are only exemplary. In principle, it is possible to vary the shape and type of the face seal 6 and the shape and nature of the shaft seal 7. Thus, the end face seal can be formed by certain shapes of the end face with a radially acting sealing lip. In that regard, the invention also extends to similar seal embodiments in which a contacting end face Chen seal cooperates with a shaft seal in particular a non-contact shaft seal.

The embodiments according to FIGS. 1 and 3 show a godet with driven drive shaft. In principle, the invention is not limited thereto. Thus, there is the possibility that the drive shaft is held freely rotatably on a roller carrier. The invention also extends to such godets, in which the roll shell is designed to be heatable by a heating means. The inventive design of the godet can therefore be applied without problems in variants without electric motor or variants with heated roller shell.

Reference sign list

1 bearing housing

2 drive shaft

3 roller jacket

4 hub

5.1, 5.2 bearings

6 face seal

7 shaft seal

8 Sliding ring, mechanical seal

9 sealing surface

10 holding groove

11 retaining bead

12 sealing lip

13 circumferential groove

14 lid insert

15 sealing ring

16 fastener

17 metal ring

18 sealing groove

19.1, 19.2, 19.3 sealing gap

20 bearing bore

21 electric motor

22 cooling channel

23 barrier medium

24 socket

25 Supply line

26 cover ring

27 retaining flange 28 approach

29 parting line

30 shaft ring

Claims

claims

A godet for guiding synthetic threads in a melt spinning process comprising a cylindrical roller shell (3) fixedly connected to a projecting end of a drive shaft (2) and a bearing housing (1) in which the drive shaft (2) is rotatably mounted wherein a sealing means (6, 7) is provided between the bearing housing (1) and the rotatable roller shell (3) for sealing a bearing environment,

characterized,

the sealing means is formed by an end face seal (6) between the roller shell (3) and the bearing housing (1) and by a shaft seal (7) between the drive shaft (2) and the bearing housing (1).

Godet according to claim 1,

characterized,

in that the end face seal (6) is designed as a mechanical seal (8) between an end-face sealing surface (9) of the roller shell (3) and an axially opposite retaining groove (10) in the bearing housing (1).

Godet according to claim 2,

characterized,

in that the sealing surface (9) is formed on a hub (4) of the roller jacket (3), by which the roller jacket (3) is held on the circumference of the drive shaft (2). Godet according to claim 2 or 3,

characterized,

in that the mechanical seal has a sliding ring (8) with a retaining bead (11) and a sealing lip (12) formed at an angle on the retaining bead (11).

Godet according to claim 4,

characterized,

the sliding ring (8) has a circumferential groove (13) formed between the retaining bead (11) and the sealing lip (12).

Godet according to one of claims 1 to 5,

characterized,

in that the shaft seal (7) is in contact and is preferably formed by a stationary metal ring (17) which protrudes contactlessly into a sealing groove (18) to form at least one sealing gap (19.1).

Godet according to claim 6,

characterized,

in that the metal ring (17) is held on the circumference of the drive shaft (2) or in a bearing bore (20) of the bearing housing (1) and in that the sealing groove (18) in the bearing bore (20) of the bearing housing (1) or on the circumference of the drive shaft (2) is formed.

Godet according to claim 6 or 7,

characterized,

the sealing gap (19.2) is preferably filled with a sealing medium (23) with a grease.

9. Galette according to one of claims 1 to 8,

characterized,

that the roller casing (3) is hollow-cylindrical at the ends and that the projecting end of the roller casing (3) is closed by a funnel-shaped lid insert (14), the lid insert (14) being fastened to the end of the drive shaft (2)

10. Galette according to one of claims 1 to 9,

characterized,

in that the drive shaft (2) is connected to an electric motor (21) which is integrated in the bearing housing (1).

11. Galette according to one of claims 1 to 10,

characterized,

that the bearing housing (1) in the region of the electric motor (21) and in

Area of storage (5.1, 5.2) of the drive shaft (2) has a circumferential cooling channel (22) for receiving a cooling liquid.

Godet according to one of claims 1 to 11,

characterized,

in that the drive shaft (2) is mounted in the bearing housing (1) by a plurality of roller bearings (5.1, 5.2) and in that the roller bearings (5.1, 5.2) each contain a bearing grease. 13. Galette according to one of claims 1 to 12,

characterized,

the bearing housing (1) has a holding flange (27) at the end of the roller jacket (3), which has a cover ring (26) enclosing the end of the roller jacket (3).