CN110863273A

CN110863273A - Nozzle fastening system for open-end rotor spinning device

Info

Publication number: CN110863273A
Application number: CN201910794620.XA
Authority: CN
Inventors: L·温岑
Original assignee: Saurer Spinning Solutions & CoKg GmbH
Current assignee: Saurer Spinning Solutions & CoKg GmbH
Priority date: 2018-08-28
Filing date: 2019-08-27
Publication date: 2020-03-06
Anticipated expiration: 2039-08-27
Also published as: CN110863273B; DE102018006783A1; EP3617354A1

Abstract

The invention relates to a nozzle fastening system for an open-end rotor spinning device (1) for replaceably fastening a thread take-off nozzle (13) to a holder (12) arranged in a cover element (8). The nozzle fastening system includes: a clamping fastener (31) for axially fixing the drawing nozzle (13); at least one clamping element (32) and a fitting element (33) which are distributed between the thread drawing nozzle (13) and the holding element (12), the clamping element (32) being resilient in the radial direction. A groove (37) is provided on a nozzle shaft (36) of the thread drawing nozzle (13) as a fitting piece (33), the clamping piece (32) consisting of a spring wire (39), the spring wire (39) having a straight portion (39.1), the straight portion (39.1) of the spring wire (39) being locked into the groove (37) on the nozzle shaft (36) and being arranged tangentially to the nozzle shaft (36) in the fixed state.

Description

Nozzle fastening system for open-end rotor spinning device

Technical Field

The invention relates to a nozzle fastening system for an open-end rotor spinning device for replaceably fastening a drawing nozzle to a holder in a cover element, the nozzle fastening system comprising: the clamping fixing piece is used for axially fixing the wire drawing nozzle; at least one clamping element and a fitting element, which are distributed between the drawing nozzle and the holding element; the clamping member is resilient in the radial direction.

Background

For example, the thread drawing nozzle can be fastened exchangeably to a channel plate adapter of a so-called cover element, which closes the free-end rotor spinning device during the spinning operation. Since the draw off nozzle is exposed to severe wear due to the running yarn, the draw off nozzle typically has a funnel-shaped nozzle insert which is made of a highly wear-resistant material, preferably technical ceramic, and is permanently fastened in a nozzle mount made of a metallic material, for example by means of an adhesive bond or a press-fit connection. The nozzle mount and the nozzle insert together form a line drawing nozzle.

The channel plate adapter essentially comprises a preferably circular body with a rear conical contact surface and a mouth, which during a spinning operation protrudes to the spinning rotor, the size of the mouth matching a specific spinning rotor diameter or diameter range.

Furthermore, the open area of the so-called fibre guide channel merges into the mouth.

Such a channel plate adapter has a central through bore, on the inlet side of which a draw-off nozzle is replaceably fastened, a so-called draw-off tube being joined to the outlet side of the central through bore.

In DE102008019214a1, for example, a stringing nozzle replaceably fastened in a central through bore of a channel plate adapter generally comprises a special nozzle mount and a ceramic nozzle insert permanently fastened to the nozzle mount.

The nozzle mount, which is usually ferromagnetic, corresponds to a corresponding permanent magnet set in the channel plate adapter, which fastens the nozzle mount in a force-fitting manner.

These drawing nozzles, which have been known for a long time, have proven themselves in practice and allow optimized spinning conditions to be established in open-end spinning devices.

However, these drawing nozzles have the disadvantage of being very complicated to manufacture and, as a result, expensive. For example, the design of the transition, in particular from the nozzle insert to the nozzle mount, is complicated because it must be ensured that there are no abutting edges which, in view of the additional friction generated, negatively affect the quality of the yarn. Furthermore, due to the cooperation of the nozzle insert and the nozzle mount, only small deviations are tolerated in the production process, resulting in high production costs due to scrap or reworking parts.

DE10057272A discloses a drawing nozzle with a cover element, in which case a clamping fastener is provided for the exchangeable fastening of the drawing nozzle. The clamping element and the fitting are distributed among the drawing nozzle and the cover element. The clamping element is resilient and flexible in the radial direction. According to one embodiment, the annular bead is arranged on the nozzle shaft. The elastic ring presses against the bottom surface of the ring bead and projects into an annular recess or groove in the cover element. The problem here is that the bore in the cover element has to be made so large that the ring bead fits through it, with the result that an undesirably large chamber is formed between the nozzle shaft and the inner wall of the bore, and therefore an interlocking stable support is no longer possible in the region between the nozzle head and the ring bead. According to another embodiment, the cover element has a fiber guide made of deformable material, on which a deformable ring bead with several integral protruding sections is arranged. An annular recess or groove for receiving an annular bead is provided on the nozzle head. The design and manufacture of the deformable fiber guide is complicated. The outwardly exposed notches or pockets can become clogged or blocked by flying stubs and dust.

DE3739425 relates to a thread drawing nozzle, wherein the nozzle shaft of the thread drawing nozzle or a part fixedly connected thereto is provided with a locking hole for elastically locking an element mounted on an extension piece. As a retaining element, a ring which is elastically deformable in the radial direction is provided, which is fixedly mounted on the cover part and can be locked to a recess on the drawing nozzle. For this purpose, a closed ring is provided from which several spring elements project. Spring rings are parts with complex designs. Another disadvantage is that the outwardly exposed recesses can become clogged by fibres and dust, as a result of which the fixing lock is influenced or hindered.

Disclosure of Invention

The problem addressed by the present invention is therefore to specify a fastening system for a drawing nozzle which is easy to assemble and disassemble and which can be manufactured simply and economically.

The features listed individually in the claims, which are hereby expressly set out as dependent claims, can be combined with one another in any desired technically sensible manner to define further embodiments of the invention. Furthermore, the features specified in the claims are defined and explained in more detail in the description, wherein additional preferred embodiment examples of the invention are presented.

According to the present invention, there is provided a nozzle fastening system for an open-end rotor spinning device for replaceably fastening a drawing nozzle to a holder arranged in a cover element, the nozzle fastening system comprising: a clamping fixture for axially fixing the drawing nozzle (13); at least one clamping element and a fitting element, which are distributed between the drawing nozzle and the holding element; the clamping element is resiliently elastic in the radial direction. The groove is arranged on the nozzle shaft of the wire drawing nozzle and is used as a matching piece. The clamping member is composed of a spring wire having a straight portion. In the secured state, the straight portion of the spring wire locks into a groove on the nozzle shaft and is arranged tangentially to the nozzle shaft.

The nozzle fastening system according to the invention ensures a reliable axial fixation of the drawing nozzle in a simple manner.

In the nozzle fastening system according to the invention, the drawing nozzle preferably has a circumferential groove as the groove. The circumferential groove has the advantage that the direction of insertion of the withdrawal nozzle into the holder can be freely chosen. It is advantageous if the groove has a cross-section in the shape of a recess. The groove can advantageously have a circular cross section.

In a particularly advantageous embodiment of the nozzle fastening system according to the invention, the groove or circumferential groove on the nozzle shaft has a surface on the side remote from the nozzle head, which surface forms an acute angle with the axis of the drawing nozzle. I.e. an angle smaller than 90 deg.. When the nozzle shaft is inserted into the holder with the clamping member, the straight portion of the spring wire is radially pressed against the nozzle shaft. Once the groove reaches the spring wire, the angled surface of the groove causes the radial force of the spring wire to be converted into an axial force. The axial force causes the drawing nozzle to be pulled into the holder until the spring wire is locked in the groove, whereby the drawing nozzle is axially fixed.

According to an advantageous embodiment of the inventive stringing nozzle, it is proposed that the clamping element contacts the groove or the circumferential groove and the retaining element.

The clamping member is preferably arcuate. The arcuate clamp member preferably includes a first leg and a second leg. The first leg is preferably designed as a straight part of the clamping connection. The second leg can preferably be designed as a bend. The two legs preferably extend around the holder in a clamping manner.

According to a further embodiment, a slot-like opening is provided in the holder, which opening overlaps the groove or slot. The slot-like opening of the holder preferably holds a straight portion of the spring wire or a clamping connection.

The drawing nozzle according to the invention preferably has an anti-rotation locking. The anti-rotation locking is preferably embodied as an interlocking profile. For example, the contour can be designed as a polygon, preferably a hexagon. In order to produce an interlocking connection, the nozzle shaft of the drawing nozzle preferably has an outer contour and the holder has a corresponding inner contour.

In a preferred embodiment of the invention, ceramics are the preferred material for producing the drawing nozzle, since ceramics (preferably oxide ceramics) have, inter alia, high mechanical strength, good wear and abrasion properties and high hardness. The drawing nozzle can preferably be made entirely of ceramic. I.e. no separate nozzle mounting is required. The required recess in the nozzle shaft can be produced in a ceramic material without trouble.

According to a further embodiment of the invention, the nozzle mount of the drawing nozzle is produced as a die-cast part. The die cast part is preferably made of zinc. In this case, the nozzle insert in the nozzle head is advantageously made of ceramic. Zinc has particularly good thermal conductivity.

Drawings

Further advantages and details of the string drawing nozzle according to the invention are explained on the basis of a preferred embodiment example, to which the subject matter of the invention is not restricted. In the following drawings:

FIG. 1 shows a side view in partial cross-section of an open-end spinning device using a nozzle fastening system according to the present invention;

FIG. 2 shows a spinning rotor with a take-off nozzle in a channel plate adapter, with a clamping fixture according to the invention;

FIG. 3 shows a side view in cross-section and a top view of a nozzle fastening system according to the present invention; and

fig. 4 shows an alternative embodiment of a nozzle fastening system according to the invention.

List of reference numerals

1 open-end rotor spinning device

2 revolving cup shell

3 spinning rotor

4 revolving cup shaft

5 support disc bearing system

6 tangential belt

7 compression roller

8 cover element

9 middle sealing piece

10 negative pressure pipeline

11 negative pressure source

12 holder

12.1 channel plate adapter

12.2 through boring

13 wire drawing nozzle

14 fiber guide channel

15 draw-line pipe

16 pivot axis

17 opening roller shell

18 drive device

19 bearing bracket

20 bearing bracket

21 individual roll

22 sliver draw-in drum

23 spindle disk

24 tangential belt

25 drive shaft running the length of the machine

26 spinning rotor

27 revolving cup groove

28 monofilament

29 yarn

30 wire drawing device

31 clamping fastener

32 clamping part

33 mating member

34 surfaces of the groove

35 nozzle tip

36 nozzle shaft

37 groove

38 groove

39 spring wire

39.1 first leg of spring wire

39.2 second leg of spring wire

40 slot-like openings

Detailed Description

Fig. 1 schematically shows a free-end rotor spinning device 1. As is known, such open-end rotor spinning devices 1 each have a rotor housing 2 in which the spinning rotor of a spinning rotor 3 rotates at a high rotational speed.

The spinning rotor 3 is supported, for example by means of its rotor shaft 4, in a wedge-shaped support gap of a so-called support disc bearing system 5, the spinning rotor 3 being frictionally driven by a tangential belt 6, which belt 6 extends the length of the machine and is actuated by a pressure roller 7.

The rotor shaft 4 is axially fixed by means of permanent magnetic thrust bearings 18, for example.

The rotor housing 2, which itself opens forwards, is closed during the spinning operation by a pivotally mounted cover element 8, into which cover element 8 a channel plate is provided, which cover element 8 rests against the rotor housing 2 by means of a circumferentially extending intermediate seal 9.

The rotor housing 2 is further connected via a corresponding negative pressure line 10 to a negative pressure source 11, which negative pressure source 11 generates the required spinning negative pressure in the rotor housing 2.

The channel plate adapter 12.1 is exchangeably arranged in a holder of a channel plate (not shown in more detail), the channel plate adapter 12.1 having an opening area of the fibre guide channel 14 and a thread drawing nozzle 13 according to the invention, the thread drawing nozzle 13 adjoining the thread drawing tube 15.

Furthermore, the sliver opening device is integrated in the cover element 8, the cover element 8 being mounted for limited rotation about the pivot axis 16.

That is, the cover element 8 has a picker roller housing 17 and rear bearing brackets 19, 20 for supporting a picker roller 21 or a sliver draw-in drum 22.

The opening roller 21 is driven by an endless tangential belt 24 running along the length of the machine, the endless tangential belt 24 acting on a spindle 23 of the opening roller 21, and the sliver draw-in drum 22 is preferably driven by a drive shaft 25 or worm gear (not shown) running along the length of the machine.

As shown in fig. 2 on a large scale, the drawing nozzle 13 according to the invention is arranged in the central through bore 12.2 of the channel plate adapter 12.1, positioned in the spinning cup 26 of the spinning rotor 3 during the spinning process, the spinning cup 26 being open towards the front.

As indicated above, the spinning rotor 26, which has a so-called rotor recess 27, rotates within the rotor housing 2 at a high rotational speed.

The single fibers 28 released from the feed sliver (not shown) by the opening roller 21 are fed into the spinning rotor 3 via the fiber guide channel 14 and, as is usual in the case of free-end rotor spinning devices, are first collected in the area of the rotor slot 27 of the spinning rotor 3.

In the so-called splicing zone, the filaments 28 are attached to the yarn 29, which yarn 29 is subsequently drawn off from the spinning rotor 3 via the draw nozzle 13.

The drawing speed at which the new yarn 29, which rolls or slides on the surface of the drawing nozzle 13 during drawing, is drawn out of the open-end spinning device 1 in the direction a depends on various factors, such as the rotor speed and the desired yarn twist, and can be set in a defined manner by means of the drawing device 30.

The drawing nozzle 13 is connected to the channel plate adapter 12.1 of the holder 12 by means of a clamping fastener 31, so that it can be easily released if required. The clamping element 31 comprises at least one clamping element 32 and a fitting element 33 designed as a recess 37.

As is clear from fig. 3, the drawing nozzle 13 has a nozzle head 35 and a hollow cylindrical nozzle shaft 36. A circumferential groove 38 having a substantially semicircular cross section is provided on the outer periphery of the nozzle shaft 36. Furthermore, a clamping piece 32 is provided which consists of a spring wire 39, the clamping piece 32 being arcuate, the spring wire having an interruption in the circumferential direction. The one-piece spring wire 39 has a first leg 39.1 designed as a straight portion and a second leg 39.2 designed as a curved portion.

According to fig. 3, the stringing nozzle 13 is inserted into the through bore 12.2 of the channel plate adapter 12.1. For inserting the straight portion 39.1 of the spring wire 39, a slot-like opening 40 extending therethrough is provided in the channel plate adapter 12.1, the opening 40 being aligned in the radial direction with the slot 38. The straight part 39.1 of the spring wire is arranged in the slot 38 and pressed against the inner wall of the slot 38, while the curved part 39.2 of the spring wire 39 extends around the channel plate adapter 12.1 and is pressed against its outer side.

When in the locking position, the clamping part 32 is supported in the radial direction in a recess 37 on the nozzle shaft 36, the recess 37 here being designed as a groove 38 and in the axial direction on the holder 12.

In order to support the clamping element 32 in the axial direction on the channel plate adapter 12.1 of the holder 12, the region of the first leg 39.1 outside the groove 38 is pressed in the axial direction against the channel plate adapter 12.1. Furthermore, the first leg 39.1 can slightly protrude into the slot-like opening 40. In this way, a locking is achieved, preventing the stringing nozzle 13 from being undesirably moved out of the through-bore 12.2 of the channel plate adapter 12.1 of the holder 12 in the axial direction.

For locking the clamping member 32, it is also possible to provide a transverse groove (not shown), for example a bore hole, in the tangential direction through the bore hole 12.2 through the wall of the channel plate adapter 12.1, which is aligned with the groove 38. When the spring wire 39 is inserted, the straight portion 39.1 slides through the transverse slot and the groove 38. In the locked position, the region of the portion 39.1 of the spring wire 39 outside the groove 38 presses against the channel plate adapter 12.1 and prevents the withdrawal nozzle 13 from moving out of the through-bore 12.2 in the axial direction.

In fig. 3, the groove 38 has a circular cross-section. Fig. 4 shows a variant in which the groove has a slanted surface 34. That is, the surface forms an acute angle with the axis of the drawing nozzle 13. The surface 34 is located on the side of the slot 38 remote from the nozzle head 35. When the nozzle shaft 36 is inserted into the channel plate adapter 12.1, the straight portions 39.1 of the spring wires 39 are pressed radially against the nozzle shaft 36. Once the slot 38 reaches the spring wire 39, the angled surface 34 of the slot causes the radial force of the spring wire 39 to be converted into an axial force. This axial force causes the withdrawal nozzle 13 to be pulled into the channel plate adapter 12.1 until the spring wire 34 is locked in the groove 38, whereby the withdrawal nozzle 13 is axially fixed.

The thread drawing nozzle 13 can be easily pulled back against the force of the spring thread 39. Thus, the thread drawing nozzle 13 can be easily replaced.

Claims

1. A nozzle fastening system for an open-end rotor spinning device (1) for fastening a drawing nozzle (13) in an exchangeable manner to a holder (12) arranged in a cover element (8), the nozzle fastening system comprising: a clamping fastener (31) for axially fixing the drawing nozzle (13); at least one clamping element (32) and a fitting element (33) which are distributed in the drawing nozzle (13) and the holding element (12); and the clamping part (32) which is elastically formed in the radial direction,

it is characterized in that the preparation method is characterized in that,

a recess (37) is provided as the fitting element (33) on a nozzle shaft (36) of the thread drawing nozzle (13), the clamping element (32) consists of a spring wire (39), the spring wire (39) has a straight portion (39.1), and in the fixed state the straight portion (39.1) of the spring wire (39) is locked into the recess (37) on the nozzle shaft (36) and is arranged tangentially to the nozzle shaft (36).

2. Nozzle fastening system according to claim 1, characterized in that a circumferential groove (38) is provided as the groove (37).

3. A nozzle fastening system according to any one of the preceding claims, characterized in that the recess (37) on the nozzle shaft (36) has a surface (34) on the side facing away from the nozzle head (35), which surface (34) forms an acute angle with the axis of the drawing nozzle (13).

4. Nozzle fastening system according to one of the preceding claims, characterized in that the clamping piece (32) is in contact with the groove (37) and the holder (12) under pressure.

5. Nozzle fastening system according to one of the preceding claims, characterized in that the clamping piece (32) is arcuate.

6. Nozzle fastening system according to claim 5, characterized in that the arcuate clamping piece (32) has a first leg (39.1) designed as a straight part and a second leg (39.2) preferably designed as a curved part, the two legs (39.1, 39.2) extending around the holder in a clamping manner.

7. The thread drawing nozzle (13) according to any one of the preceding claims, wherein a slot-like opening (40) is provided in the holder (12), said opening (40) overlapping the groove (37).

8. The thread drawing nozzle (13) according to any one of the preceding claims, characterized in that the thread drawing nozzle (13) has an anti-rotation locking.

9. The drawing nozzle (13) according to any one of the preceding claims, characterized in that the drawing nozzle (13) is made of ceramic.

10. The drawing nozzle (13) according to any one of the preceding claims, characterized in that the drawing nozzle (13) has a nozzle mount, which is produced as a die cast part, preferably made of zinc.