WO2010034416A1

WO2010034416A1 - Air jet spinning unit having spindle-shaped component

Info

Publication number: WO2010034416A1
Application number: PCT/EP2009/006611
Authority: WO
Inventors: Peter Scweier
Original assignee: Maschinenfabrik Rieter Ag
Priority date: 2008-09-29
Filing date: 2009-09-11
Publication date: 2010-04-01
Also published as: EP2329066B1; EP2329066A1; CN102165111A; DE102008050874A1; JP2012504194A; CN102165111B; KR20110060961A; US20110173945A1

Abstract

An air jet spinning unit comprises a spindle-shaped component. The spindle-shaped component comprises a thread pulloff channel (10) and can be moved along the thread pulloff channel. The air jet spinning unit comprises at least one magnet (22) for holding the spindle-shaped component in the operating position thereof.

Description

Air nozzle spinnaqqreqat with spindle-shaped component

The invention relates to an air jet spinning unit with a spindle-shaped component which has a yarn withdrawal channel and which is movable along the yarn withdrawal channel.

The invention further relates to a spindle-shaped component for an air jet spinning unit with a yarn withdrawal channel, with a cylindrical sliding surface for receiving the air jet spinning unit and with a tapered spindle tip containing the inlet opening of the yarn withdrawal channel.

An air jet spinning unit of the aforementioned type is known from DE 10 2004 044 345 A1. To move the spindle-shaped component, a spring and a pneumatic cylinder are integrated in the known air jet spinning unit. The complicated structure of the air jet spinning unit makes the production consuming.

From DE 195 01 545 A1 an air jet spinning unit is known in which the movement and holding devices for the spindle-shaped component are not integrated in the air jet spinning unit. The spindle-shaped component is connected to a cylinder arranged outside the air jet spinning unit and can thereby be moved along the yarn withdrawal channel. When moving the spindle-shaped component, the air jet spinning unit is completely opened. The external pneumatic cylinder requires a lot of space in the air jet spinning device.

The invention has for its object to provide an air jet spinning unit with a simplified structure. The object is achieved in that the air jet spinning unit has at least one magnet for holding the spindle-shaped component in its operating position. In the spindle-shaped component, the object is achieved in that the spindle-shaped component contains a magnetic contact surface for attachment of the spindle-shaped component in its operating position in the air jet spinning unit.

The only holding means for the spindle-shaped component in the air jet spinning unit is a magnet. Of course, several magnets can be provided. Other fasteners and retaining means are not required on the air jet spinning unit or on the spinning device. The manufacturing and assembly costs for the air jet spinning unit is thereby greatly simplified.

The spindle-shaped component is held in its operating position in the air jet spinning unit, that a tapered spindle tip of the spindle-shaped component, which contains the inlet opening of the thread withdrawal channel, is located in a swirl chamber, in which the spinning fiber structure by a rotating air flow a spinning spin is granted. It is known that in the air jet spinning unit malfunctions can occur and the vortex chamber must be cleaned. To rectify malfunctions, the spindle-shaped component is moved parallel to the thread withdrawal channel in the thread withdrawal direction, so that the spindle tip moves out of the vortex chamber. Fiber accumulations in the vortex chamber can thus be eliminated.

The invention has the advantage that for the movement of the spindle-shaped component no complicated and / or very much space-claiming structures are required. The spindle-shaped component can be accommodated in a simple cylindrical receptacle in a base body of the air jet spinning unit and can be moved along the cylindrical receptacle. For holding the spindle-shaped component in its operating position, at least one magnet can be arranged in the base body. The magnet cooperates with the magnetic abutment surface on the spindle-shaped component and holds the spindle-shaped component in its operating position. According to another advantageous embodiment, at least one magnet can be arranged on the spindle-shaped component or a holding element connected thereto. The magnet cooperates in this embodiment with a magnetic contact surface on the base body of the air jet spinning unit. In both embodiments, the spindle-shaped component can be moved counter to the magnetic force in the yarn withdrawal direction along the yarn withdrawal channel to eliminate malfunction, so that the spindle tip moves out of the vortex chamber.

In the simplest case, the movement of the spindle-shaped component can be done manually by maintenance personnel. Due to the simple attachment of the spindle-shaped component, it is also possible to very easily remove the spindle-shaped component from the air jet spinning unit and replace it with another spindle-shaped component.

It can also be advantageous that the movement of the spindle-shaped component takes place by means of a maintenance device which can be moved along the air-spinning machine, a so-called service robot.

In an embodiment of the invention, it may be advantageous that a lever, in particular a pivot lever, is provided for moving the spindle-shaped component. Advantageously, the lever is attached to the base body and only clipped on the spindle-shaped component, so that the spindle-shaped component is still very easily replaceable.

The magnetic contact surface for fixing the spindle-shaped component in its operating position is preferably annular and may be arranged concentrically to the cylindrical sliding surface. In an advantageous embodiment, the spindle-shaped component consists of several components, preferably of three components. A first component contains the cylindrical sliding surface. The first component preferably consists of a material which has good sliding properties in relation to the material of the main body. Advantageous for the first component is a plastic or a brass or bronze material. The cylindrical sliding surface may also have a coating. The second component of the spindle-shaped component contains the tapered spindle tip with the inlet opening of the thread withdrawal channel. The conical outer contour of the second component is preferably divided into regions with different conicity, wherein the cone angle decreases towards the spindle tip. A third component of the spindle-shaped component may include the magnetic bearing surface for fixing the spindle-shaped component in its operating position. The third component is preferably formed by a steel ring attached to the second component.

In another advantageous embodiment, it is provided that the spindle-shaped component consists of two components. This embodiment is advantageous if the first component consists of a magnetic material, for example of steel. The magnetic contact surface for fixing the spindle-shaped component in its operating position can then be integrated into the first component, so that can be dispensed with the third component. The spindle-shaped component thus consists of a first component containing the cylindrical sliding surface and the magnetic bearing surface, and of a second component containing the spindle tip.

In a further advantageous embodiment, it can be provided that the spindle-shaped component has an injection channel opening into the thread withdrawal channel and a compressed air connection for supplying the injection channel. The compressed air connection is suitable for attaching a compressed air hose. The injection channel can be acted upon for a piecing process with compressed air, so that in the yarn withdrawal channel creates a defined air flow. Through the injection channel directed to the spindle tip air flow can be generated in the thread withdrawal channel, which serves for returning a thread end counter to the thread take-off direction by the air jet spinning unit. It can also be provided that a rotating air flow in the yarn withdrawal channel can be generated by the injection channel. A rotating air flow in the thread withdrawal channel is particularly advantageous if a piecing without auxiliary thread is to be performed.

The invention has the advantage that the length of the thread withdrawal channel in the spindle-shaped component can be relatively small. The shortest possible thread withdrawal channel in the spindle-shaped component can reduce a deterioration of the thread quality, which can be caused by excessive contact of the spun thread with the wall of the thread withdrawal channel. Advantageously, the length of the yarn withdrawal channel in the spindle-shaped component is less than 80 mm, and in particular less than 40 mm.

Further advantages and features of the invention will become apparent from the following description of an embodiment.

Show it:

1 is an enlarged view of an air jet spinning unit according to the invention in longitudinal section,

FIG. 2 shows a plan view in the direction of the arrow II of FIG. 1. The air jet spinning unit 1 shown in FIG. 1 serves to produce a spun yarn 2 from a staple fiber strand 3. The air jet spinning aggregate 1 is preceded by a drafting device 4.

The staple fiber staple 3 is fed in drafting 4 in the direction of delay A and withdrawn as spun yarn 2 in the yarn withdrawal direction B and forwarded to a winding device, not shown. The drafting unit 4, which is only partially shown, is preferably a three-cylinder drafting unit and thus comprises a total of three pairs of rollers, each having a driven lower roller and an upper roller designed as a pressure roller. Shown is only the delay zone of the drafting 4 limiting delivery roller pair 5, 6. In such a drafting unit 4, the staple fiber strand 3 is warped in a known manner to a desired fineness. Following the nip line of the delivery roller pair 5, 6 of the drafting system 4 then there is a thin fiber ribbon 7, which is finished stretched and still untwisted.

The air jet spinning unit 1, the fiber ribbon 7 is fed via a Faserzuführkanal 8. It follows a so-called vortex chamber 9, in which the fiber ribbon 7, the spinning rotation is granted, so that the spun yarn 2, which is withdrawn through a yarn withdrawal channel 10, is formed.

A fluid device generates during the spinning process in the vortex chamber 9 by blowing compressed air through tangentially into the vortex chamber 9 opening compressed air nozzles 11 a rotating vortex flow. The compressed air is supplied in the air jet spinning unit 1 during operation via a compressed air channel 12. From the compressed air channel 12, the compressed air passes first into a surrounding the vortex chamber 9 annular channel 13, to which said compressed-air nozzles 11 are connected directly. The emerging from the compressed air nozzles 11 compressed air is discharged through an exhaust duct 14. The exhaust duct 14 is annularly arranged around a spindle-shaped component 15 which contains the yarn withdrawal channel 10. The spindle-shaped component 15 is stationary during operation.

In the area of the swirl chamber 9, an edge of a fiber guide surface 16 is arranged as a swirl barrier, which is arranged slightly eccentrically to the yarn withdrawal channel 10 in the region of its inlet opening 17. The inlet opening 17 of the thread withdrawal channel 10 is arranged at a conically tapering end of the spindle-shaped component 15. The tapered end is referred to as a spindle tip 18. In the air jet spinning unit 1, the fibers to be spun are held on the one hand in the fiber ribbon 7 and thus guided by the Faserzuführkanal 8 substantially without rotation distribution in the inlet opening 17 of the thread withdrawal channel 10. On the other hand, the fibers in the area between the fiber feed channel 8 and the thread withdrawal channel 10 are exposed to the effect of the swirling flow in the swirl chamber 9. As a result of the turbulent flow, the fibers or at least their end regions are driven radially away from the inlet opening 17 and wrapped around the fibers already entering the yarn withdrawal channel 10. The yarns 2 made with the described air jet spinning units 1 therefore exhibit a core of fibers or fiber portions extending substantially in the yarn longitudinal direction without substantial rotation and an outer portion in which the fibers or fiber portions are rotated around the core. An air jet spinning device of this type allows very high spinning speeds, which are on the order of between 300 and 600 meters per minute.

If, for some reason, the fiber ribbon 7 or the thread 2 breaks, the drafting unit 4 is first stopped and the supply of the staple fiber strand 3 is interrupted. The unwinding device, not shown, is turned off. Before restarting the spinning process, it may be necessary to free the vortex chamber 9 of fiber residues hanging there. For this purpose, the spindle-shaped component 15 is displaced along the yarn withdrawal channel 10 in the yarn withdrawal direction B, so that the spindle tip 18 moves out of the swirl chamber 9. The vortex chamber 9 clogging fiber accumulations can then be sucked off via the connected to a vacuum source, not shown exhaust air duct 14.

A main body 19 of the air jet spinning unit 1 has a cylindrical receptacle 20, in which the spindle-shaped component 15 is movably inserted with a cylindrical sliding surface 21. In the main body 20, one or more magnets 22, in the illustrated case two magnets 22, are arranged. The spindle-shaped component 15 has a bearing surface 23, which cooperates with the magnet 22, of a magnetic material. The magnets 22 hold the spindle-shaped component 15 in its operating position. The magnetic contact surface 23 is annular. The contact surface 23 and the cylindrical sliding surface 21 are arranged concentrically around the yarn withdrawal channel 10.

To clean the vortex chamber 9, the spindle-shaped component 15 can be moved counter to the magnetic force in the yarn withdrawal direction B along the cylindrical sliding surface 21. The movement of the spindle-shaped component 15 can be performed manually by an operator or by a user the air-spinning machine movable maintenance trolley done automatically. In order for the spindle-shaped component 15 to be easily gripped, a lever 24 can be provided for moving the spindle-shaped component 15. The lever 24 can be seen in FIG. The lever 24 is designed as a pivot lever and fixed by means of a pivot axis 25 on the base body 19 of the air jet spinning unit 1. The lever 24 has projections 26 which are clipped in a groove 27 of the spindle-shaped component. The lever 24 can be actuated manually or automatically in its gripping area 28 and thereby moves the spindle-shaped component 15 parallel to the thread withdrawal channel 10. The lever 24 prevents at the same time that after moving away the contact surface 23 from the sphere of action of the magnets 22, the spindle-shaped member 15 by itself the cylindrical receptacle 20 of the main body 19 falls out. If it is necessary to remove the spindle-shaped component completely from the air jet spinning unit 1, the spindle-shaped component 15 can be easily clipped out of the lever 24 with its groove 27 and removed from the air jet spinning unit 1. By pivoting back the lever 24, the spindle-shaped component 15 is again moved counter to the yarn withdrawal direction B and the spindle tip 18 returns to its operating position in the swirl chamber 9. The magnets 22 fix the spindle-shaped component 15 on the contact surface 23rd

In the spindle-shaped component 15 an opening into the thread withdrawal channel 10 injection channel 29 is provided. Furthermore, a compressed air connection 30 is present on the spindle-shaped component 15, which can be acted on temporarily to supply the injection channel 29 with compressed air. The compressed air connection 30 is formed by a connecting piece 37 for a compressed air hose, not shown. The injection channel 29 serves to support a piecing process of the air jet spinning unit 1 and can open in the yarn withdrawal channel 10 in the manner shown in Figure 1, so that the compressed air flowing through the injection channel 29 in the yarn withdrawal channel 10 generates a directed against the yarn withdrawal direction B air flow. In this way, one end of a finished spun yarn 2 against the yarn withdrawal direction B through the air jet spinning unit 1 is returned to the drafting unit 4 and connected there with the staple fiber strand 3. In an embodiment not shown, the injection channel 29 may also open into the thread withdrawal channel 10 in such a way that a rotating air flow is created in the thread withdrawal channel 10.

The spindle-shaped component 15 consists of three components 31, 32, 33. A first component 31 of the spindle-shaped component 15 contains the cylindrical sliding surface 21, a part of the thread withdrawal channel 10 and the compressed air connection 30. If a lever 24 is provided, the first component 31 contains also the groove 27. A second component 32 forms the conical The injection channel 29 extends from the compressed air port 30 through the first component 31 and the second component 32 and terminates within the second component 32 in the thread withdrawal channel 10. Die first component 31 of the spindle-shaped component 15 is made of a plastic. The cylindrical sliding surface 21 thus has good sliding properties relative to the receptacle 20 in the base body 19. Preferably, the sliding surface 21 has a diameter of 15 to 20 mm.

A third component 33 of the spindle-shaped component 15 is provided, which contains the magnetic contact surface 23. The third component 33 consists of a steel ring attached to the second component 32. The steel ring 33 may, for example, be pressed onto the cylindrical sliding surface 21 or secured by threaded pins, not shown. The distance between the contact surface 23 and the spindle tip 18 in the region of the inlet opening 17 is important for the properties of the spun yarn 2. By changing the distance from the spindle tip 18 to the contact surface 23 can be varied, how far the spindle tip 18 in the vortex chamber 9 protrudes. Different mass can be achieved, for example, if otherwise the same dimensions only the height of the steel ring 33 is changed. In this case, steel rings 33 can be used with different height dimensions or it can be adjusted by using washers between the first component 31 and the steel ring 33, the position of the contact surface 23. As a result, tolerances on the spindle-shaped component 15 can be compensated. It can also be an otherwise finished spindle-shaped member 15 are processed in a final operation on the contact surface 23 to ensure an exact distance of the spindle tip 18 of the contact surface 23.

The spindle component 18 containing the second component 32 is inserted via cylindrical receiving surfaces 34 in the first component 31 and fixed by a threaded pin 35. In order to seal the transition of the injection channel 29 from the first component 31 into the second component 32, the receiving surfaces 34 may be associated with sealing rings 36. The second component 32 can also be pressed into the first component 31 in an embodiment not shown, then the threaded pin 35 and the sealing rings 36 could be dispensed with. The component 32 has on its outer contour a double cone which adjacent to the spindle tip 18 has a small cone angle and subsequently a large cone angle. In the region of the outlet opening 38 of the thread withdrawal channel 10, a wear-resistant insert 39 can be inserted into the spindle-shaped component. The insert 39 may be made of ceramic and is inserted into the first component 31. To avoid negative influences on the thread 2, the thread withdrawal channel 10 is made as short as possible. The length of the yarn withdrawal channel 10 from the inlet opening 17 to the outlet opening 38 is about 40 to 60 mm.

Claims

claims

Characterized in that the air jet spinning unit (1) at least one magnet (22) for holding the spindle-shaped component (1) with a spindle-shaped component having a yarn withdrawal channel (10) and which is movable along the yarn withdrawal channel (10). 15) in its operating position.

2. Air jet spinning unit according to claim 1, characterized in that a magnet (22) in a base body (19) of the air jet spinning unit (1) is arranged.

3. Air jet spinning unit according to claim 1, characterized in that a magnet (22) is arranged on the spindle-shaped component (15).

4. Air jet spinning unit according to one of claims 1 to 3, characterized in that the air jet spinning unit (1) has a cylindrical receptacle (20) for the spindle-shaped component (15), along which the spindle-shaped component (15) is movable.

5. Air jet spinning unit according to one of claims 1 to 4, characterized in that the spindle-shaped component (15) has a with the magnet (22) cooperating bearing surface (23) made of magnetic material.

6. air jet spinning unit according to one of claims 1 to 5, characterized in that a lever (24) for moving the spindle-shaped member (15) is provided.

7. spindle-shaped component for an air jet spinning unit (1) with a thread withdrawal channel (10), with a cylindrical sliding surface (21) for receiving the air jet spinning unit (1) and with a tapered spindle tip (18) having an inlet opening (17) of the yarn withdrawal channel (10), characterized in that the spindle-shaped component (15) includes a magnetic bearing surface (23) for fixing the spindle-shaped component (15) in its operating position in the air jet spinning unit (1).

8. spindle-shaped component according to claim 7, characterized in that the magnetic bearing surface (23) is annular.

9. spindle-shaped component according to claim 7 or 8, characterized in that the magnetic bearing surface (23) is arranged concentrically to the cylindrical sliding surface (21).

10. spindle-shaped component according to one of claims 7 to 9, characterized in that the spindle-shaped component in the thread withdrawal channel (10) opening injection channel (29) and a compressed air connection (30) for supplying the injection channel (29).

A spindle-shaped component according to any one of claims 7 to 10, characterized in that the spindle-shaped component (15) consists of three components (31, 32, 33), a first component (31) containing the cylindrical sliding surface (21) a second component (32) includes the spindle tip (18) and wherein a third component (33) includes the magnetic abutment surface (23).

12. spindle-shaped component according to claim 11, characterized in that the first component (31) consists of a plastic.

13. spindle-shaped component according to claim 11 or 12, characterized in that the third component (33) consists of a on the first component (31) fixed steel ring.