WO2006021241A1

WO2006021241A1 - Fiber-guiding duct for an open-ended spinning device

Info

Publication number: WO2006021241A1
Application number: PCT/EP2005/004368
Authority: WO
Inventors: Heinz-Georg Wassenhoven
Original assignee: Saurer Gmbh & Co. Kg
Priority date: 2004-08-24
Filing date: 2005-04-22
Publication date: 2006-03-02
Also published as: DE102004040875A1; CN101006213A; EP1784530A1

Abstract

The invention relates to a fiber-guiding duct for an open-ended spinning device in order to pneumatically connect a sliver-dissolving device in an uninterrupted manner to a spinning rotor that revolves in a vacuum-impinged rotor housing at a great rotational speed. Said fiber-guiding duct is composed of at least one wear-resistant, tubular duct insert. According to the invention, an oversized duct insert (18A or 18B) is cast into an injection-molded or diecast component (12, 43), said duct insert (18A or 18B) obtaining its final dimensions only during the casting process by pressing the duct insert (18A or 18B) against at least one associated interior supporting slide.

Description

description

Fiber guide channel for an open-end spinning device

The invention relates to a Faserleitkanal for an open-end spinning device with the features of the preamble of claim 1 and a method for producing such a Faserleitkanals (claim 2).

Fiber guide channels are associated with open-end spinning machines, for example with open-end

Rotor spinning machines, long known in various designs and described in detail in numerous publications.

There are both known one-piece Faserleitkanäle, as well as two-part Faserleitkanäle, for example, consist of a set in a connection hole of the opening roller housing Faserleitkanal input component and integrated in a channel plate adapter Faserleitkanal- output member.

Such two-part Faserleitkanäle are described for example in DE 197 12 881 Al or DE 195 11 084 Al

On the execution of the fiber guide channels over the individual fibers from the opening roller to the spinning rotor of the open-end

Spinning devices are transported are, in particular with regard to the geometric

Training or the surface finish of the inner surface, high

Requirements made.

That is, the flow conditions within this

Fiber ducts must ensure that the fibers during be kept stretched or stretched the transport.

In addition, the surface of these components must be consistently smooth so that during the pneumatic transport of the

Fibers can not bind fibers.

It should also be avoided that in the

Grenzschichtbereich the Faserleitkanäle can form harmful air vortex.

The fiber guide channels used in practice are usually either, as described in DE 197 12 881 Al, formed as a diecast or, as explained in DE 195 11 084 Al, made of sheet steel.

According to DE 195 11 084 A1, the fiber guide channel input component is, for example, cold-formed, for example in the

Deep-drawn process manufactured manufactured sheet metal part, the interchangeable in a corresponding receiving bore of a

Opening roller housing is fixed.

The sealing of this Faserleitkanalbauteils over the

Opening roller housing takes place via a voltage applied to the outer circumference of the fiber guide O-ring seal.

Compared to the channel plate of this known component is sealed by means of a hose nozzle.

In practice, however, it has been found that in such trained and arranged steel sheet structures

Sealing problems can occur that are proper

Considerably complicate spinning operation.

Faserleitkanäle, which are made of sheet steel parts, are also described in DE 28 00 795 Al or EP 0 825 282 Bl. -Z-

DE 28 00 795 A1 describes a one-piece

Faserleitkanal, which is poured directly into the opening roller housing.

In the production of such Faserleitkanäle is first in a first step from a steel sheet

Channel insert manufactured. This prefabricated component is then encapsulated with, for example, liquid aluminum in a diecasting tool, which preferably has an inner mold corresponding to the opening roller housing.

However, the manufacturing method described has none

Getting into practice found because the problems encountered were not satisfactory to solve.

For example, it turned out that the off

Steel sheet prefabricated channel insert in the die casting tool often heavily deformed due to the high pressure.

In EP 0 825 282 B1, inter alia, the output side, in the region of the channel plate arranged Faserleitkanalabschnitt is shown and described. The Faserleitkanalabschnitt is formed as a sheet steel part, which was prepared for example by hydrostatic forming and either poured into the channel plate of the open-end spinning device or is attached via a clip connection releasably attached to this channel plate.

Further details of how this sheet steel part is poured into the channel plate, this patent application are not removable.

Fiber guide channels, which are produced as die-cast parts, are described, for example, in DE 197 12 881 A1 or EP 0 311 988 A1. However, these die castings, which are preferably made of aluminum, have the disadvantage that the material used is not very resistant to abrasion, so that a relatively high level of wear on the fiber guide channels occurs during operation as a result of the transport of the individual fibers.

Furthermore, it has also been proposed, a

Fiber guide channel to produce galvanically.

In this method described in EP 0 275 516 A1

Metal deposited on a so-called mother mold, whose

External dimensions of the geometry of the interior of the fiber guide channel correspond.

After completion of the galvanic layer is the

Mother mold removed, giving a seamless shaped

Fiber guide receives.

However, the method described is very complicated and costly and has therefore found no input into practice.

Finally, DE 297 17 211 Ul and DE 196 03 730 Al Faserleitkanalteile known, which are made of plastic and are manufactured as injection molded parts.

According to DE 297 17 211 Ul, for example, the input-side Faserleitkanalabschnitt is integrated into an opening roller housing, which is made of a glass fiber reinforced plastic.

The opening roller housing are equipped with an abrasion-resistant, replaceable channel insert, which consists for example of a ceramic or a metallic material. DE 196 03 730 Al describes a so-called channel plate adapter, that is, a replaceable component which forms the output side Faserleitkanalabschnitt. A channel insert made of sheet steel is integrated in a plastic injection molded part.

The manufacture of these made of plastic and steel components turned out to be problematic because the injected plastic high pressure plastic parts either strongly deformed or pressed so strong on a support core that this was hardly to remove without damaging the inner surface of the channel insert , The above-described components or the known manufacturing method could therefore not prevail in connection with open-end rotor spinning devices, in particular in conjunction with Faserleitkanälen in practice.

Based on the aforementioned prior art, the present invention seeks to improve the known Faserleitkanäle, in particular to develop a method that allows cost-effective production of wear-resistant, flow-optimized Faserleitkanäle.

This object is achieved by a Faserleitkanal, as described in claim 1 or by the method described in claim 2 for producing such a Faserleitkanals.

Advantageous embodiments of the method according to the invention are the subject of the dependent claims.

The inventive design of Faserleitkanal with a wear-resistant initially manufactured with oversize Channel insert, which is poured into an injection or diecast component and has received its final dimensions only in the course of pouring by pressing the channel insert to at least one internal support slide, has the advantage that such components are not only very accurate and relatively inexpensive to produce but that Even with larger quantities a very good surface quality of the coming into contact with the fibers inner surface of the channel insert is guaranteed.

The internal support slide form in a simple and reliable way an abutment for the preformed channel insert, which receives its final, technologically relevant contour only by applying to this support slide. That is, by the internal support slide the desired clear cross-section of the channel insert is exactly pretend, in particular, the inner wall of the channel insert is treated very gently.

The method for producing the Faserleitkanäle, which is described in claim 2, provides that initially in a first operation, a wear-resistant, tubular channel insert is made, which has some excess. This preformed, slightly oversized channel insert is inserted in a second operation in a spray or die casting tool and thereby lined within the casting tool by at least one support slide.

Subsequently, liquid casting material, during injection molding a plastic, preferably die casting aluminum or an aluminum alloy, placed at high pressure in the casting tool and creates the channel insert with its inner contour gently to the support slide on. That is, the channel insert receives only by pouring its final, technologically relevant inner contour, which leads to an optimization of the single fiber transport within the Faserleitkanals.

The surface quality of the fiber guide channels which can be produced by the method according to the invention not only has a positive effect on the transport of individual fibers and thus the fiber feed, which is easily recognizable on the basis of improved yarn values which can be achieved with the device according to the invention, but also has the advantage of being based on these Way the production of Faserleitkanälen is almost possible while avoiding waste.

As explained in the claims 3 -5, within the casting tool, a support slide is used, the outer contour largely corresponds to the desired, clear inner contour of the finished Faserleitkanals. The support slide is also preferably formed in two parts, wherein the two support slide parts are inserted from opposite sides in the previously made slightly oversized channel insert.

The above-described embodiment and handling of a support slide has been found to be particularly advantageous, since it allows a reproducible production dimensionally accurate and in the field of Fasergleitfläche very smooth Faserleitkanäle.

As described in claim 6, is in preferred

Embodiment provided that the channel insert is first preformed by deep drawing. That is, the channel insert, when placed in the injection or die casting tool, already has approximately its intended final shape.

In an alternative embodiment can also be provided to produce the preformed, slightly oversized channel insert by hydrostatic forming (Anspr.7). This described for example in DE 41 03 082 Al, especially in connection with the production of complex hollow body for years proven forming process is a further possibility to produce an oversized channel insert with a very smooth inner wall cost.

The channel insert has in an advantageous embodiment an excess <0.5 mm, preferably <0.2 mm, on (Anspr.8). By such a dimensioning on the one hand ensures that the support slide can be positioned properly and without damaging the inner wall of the channel insert in the channel insert and that on the other hand it is avoided that the steel sheet of the channel insert during pressing of the aluminum folds.

As set forth in claim 9, it is also advantageous if the channel insert, preferably made of a steel sheet, is preheated.

By means of such a preheating, the structure of the material of the channel insert can be positively influenced in such a way that complete application of the steel sheet to the outer mold or to the support slide is ensured both during the hydrostatic forming and during the die casting process. In order to ensure such a complete and clean application of prefabricated prefixed channel insert to the support slide, is provided in an advantageous embodiment that the working pressure of the injection or die casting machine during the die-casting process is at least 800 bar (claim 10).

The invention will be explained in more detail with reference to an embodiment shown in the drawings.

It shows:

1 is a side view of an open-end

Spinning device, with a switched between a sliver and a rotor rotor housing Faserleitkanal, partially in section,

Fig. 2 shows the arrangement of a two-part Faserleitkanals, with an input side

Faserleitkanalabschnitt and an output side in a channel plate adapter integrated Faserleitkanalabschnitt,

3 shows the input-side Faserleitkanalabschnitt a Faserleitkanals invention in side view, in section,

4 the input-side Faserleitkanalabschnitt according to Figure 3 in front view, also in section, Fig. 5 is a perspective view of the output side Faserleitkanalabschnitt a Faserleitkanals invention, partially in section.

The open-end rotor spinning device 1 shown in FIG. 1 has, as is known, a rotor housing 2 in which a spinning rotor 3 rotates at high speed.

The spinning rotor 3 is supported with its rotor shaft 4 in the gusset of a support disk bearing 5 and is acted upon by a machine-long tangential belt 6, which is employed by a pressure roller 7.

The rotor housing 2, which in itself is open towards the front, is closed during operation by a pivotably mounted cover element 8, which has a channel plate with a seal 9. The rotor housing 2 is also connected via a corresponding suction line 10 to a vacuum source 11, which generates the necessary spin pressure in the rotor housing 2.

In a receiving opening of the channel plate 37, not shown, a preferably replaceable channel plate extension, a so-called channel plate adapter 12, is arranged. The channel plate adapter 12 has a yarn draw-off nozzle 13 and the mouth region of a fiber guide channel 14 according to the invention. At the thread take-off nozzle 13, a thread withdrawal tube 15 connects.

On the lid member 8, which is mounted rotatably limited about a pivot axis 16, an opening cylinder housing 17 is fixed. The cover element 8 has rear bearing brackets 19, 20 for mounting an opening roller 21 or a sliver feed cylinder 22.

In the illustrated embodiment, the opening roller 21 is driven in the region of its host blade 23 by a rotating, machine-long tangential belt 24, while the drive of the sliver feed cylinder 22 preferably via a (not shown) worm gear arrangement, which is connected to a machine-length drive shaft 25. Of course, individual motor drives for opening roller 21 and / or sliver feed cylinder 22 are possible. The opening cylinder housing 17 has, in its lower region, a dirt discharge opening 28 arranged in the direction of rotation of the dissolving roller 21 behind the fiber sliver draw-in cylinder 22. About this dirt outlet opening 28, the particles of dirt released from the sliver are excreted and transported away, for example, a dirt disposal facility.

FIG. 2 shows a side view of a two-part fiber guide channel 14 according to the invention.

As indicated, the fiber guide channel 14 pneumatically connects the opening roller 21 to the spinning rotor 3. The fiber guide channel 14 has an inlet-side channel section 31 and an outlet-side channel section 32.

The input-side channel section 31 consists of a channel insert 18A made of sheet steel, which is cast in a spray or die-cast body 43.

The channel insert 18B of the output-side channel section 32 is integrated into a spray-formed or die-cast body designed as a channel plate adapter 12. As indicated in Fig.l, the input-side channel portion 31 of the Faserleitkanals 14 in a (not shown) bore of the opening roller housing 17 is fixed and thereby aligned by an angle arranged on the injection or die casting 43 position fixing 34. The Faserleitkanal 14 is also sealed relative to the connection bore of the opening roller housing 17 by an O-ring seal, which is positioned in a corresponding groove of the injection or die-cast body 43.

As can be seen from FIG. 3, the injection-molded or die-cast body 43, in adaptation to the opening roller 21, has a concave curve 48.

The sealing of the fiber guide 14 relative to the channel plate 37 via a hose nozzle 38 which is clamped between the channel plate 37 and a Aeschlageschulter 41 on the die-cast body 43.

FIGS. 3 and 4 show the input-side channel section

31 of the fiber guide 14 according to the invention in side or

Front view as well as in section.

As can be seen in the injection or die-cast body 43, either made of plastic or aluminum or a

Aluminum alloy consists, cast a channel insert 18A, which is preferably made of steel or a steel alloy.

The channel insert 18A, as can be seen both in FIG. 3 and in FIG. 4, runs conically in the fiber transport direction F and terminates preferably in a circular outlet opening 51.

That is, the channel insert 18A has in its

Inlet area a width / height ratio of about 3: 1 and runs before there on the opposite mouth 51st towards conical. As shown in FIG. 4, the wall of the channel insert 18A preferably extends at an angle β with respect to the central longitudinal axis 26 of the fiber guide channel 14. A comparable situation is given in side view (Figure 3) of the fiber guide 14.

Here, the wall of the channel insert 18A extends at an angle a with respect to the central longitudinal axis 26 of the fiber guide channel 14.

Such a conical design of the channel insert 18A not only has a positive effect on the flow path of the transport air within the fiber guide channel section 31, but also facilitates the use of (not shown) support slides that securely support the channel insert 18A during the injection or die casting process.

FIG. 5 shows the output-side channel section 32 of the fiber guide channel 14. This channel section 32 also has a channel insert 18B made of sheet steel, which is cast into a spray-molded or die-cast body. The injection molded or die-cast body is designed as a channel plate adapter 12 in the present case.

The inlet opening 35 adjoining the mouth 51 of the inlet-side channel section 31 preferably has a round cross-section, while the outlet region of the channel section 32 terminates in a slot-like mouth 36.

Function of the method according to the invention:

From sheet steel, for example, by deep-drawing blank of the channel inserts 18A and 18 B are made.

These blanks formed as a hollow body initially have some excess over their final shape. The oversized channel inserts are then encapsulated in appropriate injection or pressure casting molds with plastic or aluminum or an aluminum alloy. In these injection or die casting molds, the channel inserts are thereby supported by support slide whose outer contour respectively correspond to the final inner contour of the respective channel insert of the fiber guide channel. That is, the pressed with a pressure of at least 800 bar in the injection or diecasting casting material applies the initially excessive channel inserts to the support slide, which is for example formed in two parts.

For example, in the manufacture of a channel plate adapter 12, a core member of these two-piece support slides is inserted into the channel insert 18B from the inlet port 35, while a filling member of the support slider is positioned in the channel insert 18B from the slot-like mouth 36.

After pouring into the injection or die cast body 12 and 43, the channel sections 31, 32 not only have their intended dimensions, but the inner contour directly related to the fiber transport is also very smooth.

That is, it is ensured that no fibers can get caught on the inner wall.

Claims

claims:

1. fiber guide channel for an open-end spinning device for pneumatic continuous connection of a sliver disassembling device with a spinning rotor, which rotates at high speed in a rotor housing under pressure, the fiber guide channel consists of at least one wear-resistant, tubular, channel insert,

characterized,

in that the channel insert (18A or 18B), which is initially made with oversize, is cast into a sprayed or die-cast component (12 or 43), the channel insert (18A or 18B) not having its final dimensions until it has been cast in by 'pressing on Channel insert (18A or 18B) has received at least one associated inner support slide.

2. A method for producing a Faserleitkanals according to claim 1, characterized in that a first made with oversized channel insert is inserted into a spray or die casting tool, that the channel insert within the injection or die casting tool is ausgefüttert least by a support slide and that casting material with high Pressure is pressed into the Spritz¬ or die casting tool such that the channel insert is applied with its inner contour of the support slide.

3. The method according to claim 2, characterized in that a support slide is used, the outer contour largely corresponds to the inner contour of the finished Faserleitkanals.

4. The method according to claim 3, characterized in that a two-piece support slide is used as a support slide.

5. The method according to claim 4, characterized in that the two parts of the support slide are inserted from opposite sides in the channel insert.

6. The method according to claim 2, characterized in that is used as a channel insert manufactured by deep drawing hollow body.

7. The method according to claim 2, characterized in that is used as a channel insert manufactured by hydrostatic pressure forming hollow body.

8. The method according to claim 2, characterized in that the channel insert is first made with an excess <0.5 mm, preferably <0.2 mm.

9. The method according to any one of the preceding claims, characterized in that the channel insert is made of a steel sheet which has been preheated.

10. The method according to claim 2, characterized in that the channel insert is applied within the injection molding tool with a working pressure of at least 800 bar to the support slide.