EP3461937A2 - Open-end spinning machine - Google Patents

Abstract

The invention relates to an open-end spinning device comprising a rotor housing (1) which can be subjected to negative pressure and a spinning rotor (2), the rotor housing (1) being open towards the front and closable by a cover element, the rotor housing (1) facing backwards ( 3) with a passage opening (4) for a rotor shaft (5) of the spinning rotor (2). In order to prevent the occurrence of filament winding inside the rotor housing (1) behind the spinning rotor, it is provided that at the largest outer diameter of the spinning rotor (2) has a narrow gap (6) of less than 2mm gap width between the spinning rotor (2) and the rear wall (3) of the rotor housing (1) is present and that the rear wall (3) of the rotor housing (1) is formed so that in the interior of the rotor housing (1) the area (7) behind the spinning rotor (2) is covered.

Description

The present invention relates to an open-end spinning device comprising a rotor housing which can be subjected to negative pressure and a spinning rotor. The rotor housing is open towards the front and can be closed by a cover element. Towards the rear, the rotor housing has a rear wall with a passage opening for a rotor shaft of the spinning rotor. The rotor shaft is driven outside of the rotor housing.

An open-end spinning device comprises a rotor housing with a cover element for closing the rotor housing. In the rotor housing, a spinning rotor is arranged. The spinning rotor is rotatably mounted. The spinning rotor can be driven for spinning in various ways. It is known to drive the spinning rotors of several open-end spinning devices via a common drive. The force can be transmitted from the common drive to the spinning rotors, for example by means of a belt. It is also known that each spinning rotor is associated with an electric motor single drive. In connection with a single drive, the spinning rotor is preferably mounted without contact. A non-contact storage may be formed as a magnetic storage. Contactlessly mounted spinning rotors with individual drives are particularly sensitive to contamination.

For spinning, a negative pressure in the rotor housing is required. Therefore, known open-end rotor spinning machines have a central vacuum source and a machine-length vacuum line. The vacuum supply of the open-end spinning devices is realized by a connection of the rotor housing to the machine-length vacuum line.

In spinning operation, fiber material is introduced into the rotor housing via a fiber guide channel, and the finished spun yarn is withdrawn from the rotor housing via a yarn withdrawal channel. The spinning rotor-side end of the thread take-off channel is located on a projection which is fixed to the lid member and projects into the spinning rotor. If the fibers fed into the rotor are no longer transported out through the spinning process, fiber rings are produced. This can happen, for example, in the event of a yarn breakage and, if necessary, a time-delayed shutdown of the sliver feed. First, the fibers are held by the centrifugal forces in the rotor groove. During braking of the spinning rotor, the fiber ring collapses and settles around the projection projecting into the spinning rotor. From there, the fiber ring can get further behind the spinning rotor and form a filament winding. Such a filament winding can by the in The vacuum prevailing in the rotor housing can no longer be sucked off and impairs the spinning result.

The DE 103 03 481 A1 discloses an open-end spinning device with a spinning rotor rotor and rotor shaft consisting of a rotor housing surrounding, under negative pressure rotor housing which has a passage opening for the rotor shaft mounted outside of the rotor housing, and with a passage opening sealing, with respect to the rotor shaft in the radial direction arranged floating and with the rotor shaft forming a sealing gap, on the rotor housing axially adjacent sealing element. The sealing element is provided with an extension which encloses a rear wall of the rotor cup facing the passage opening into the region of the largest outside diameter of the rotor cup while leaving a narrow envelope gap. By the enclosing the rotor plate extension, the air friction on the rotor plate should be significantly reduced. However, this arrangement can not prevent that forms inside the rotor housing behind the spinning rotor or more precisely behind the rotor plate a filament winding.

It is the object of the present invention to prevent the occurrence of filament winding in the interior of the rotor housing behind the spinning rotor.

To achieve the object, an open-end spinning device comprising a rotor housing which can be acted upon by negative pressure and a spinning rotor is proposed. The rotor housing is open towards the front and closed by a cover element, to the rear, the rotor housing has a rear wall with a passage opening for a rotor shaft of the spinning rotor. At the largest outer diameter of the spinning rotor is a narrow gap of less than 2 mm gap width between the spinning rotor and the rear wall of the rotor housing and the rear wall of the rotor housing is formed so that in the interior of the rotor housing, the area is covered behind the spinning rotor.

Due to the construction according to the invention of the rear wall of the rotor housing, the area behind the spinning rotor is shielded in the interior of the rotor housing so that fiber wraps can not get there. That is, the rear wall of the rotor housing is designed so that there are no openings in the area behind the spinning rotor from the front. The only exception is the gap between the rear wall of the rotor housing and the largest outer diameter of the spinning rotor. In compliance with the gap width of less than 2 mm according to the invention, however, a passage of fibers can be prevented as far as possible. The gap width should be larger than 0.2 mm to avoid contact of the spinning rotor with the back wall. A gap width of 1 mm is preferred.

In addition to preventing filament winding behind the spinning rotor, the open-end spinning device according to the invention has the advantage of low air friction. As a result of its rotation, a rotor generates a turbulent flow, which leads to friction losses and thus to a higher power consumption of its drive. The inventive construction of the rear wall of the rotor housing converts the turbulent flow into a laminar flow. The air flow is guided to the outside. This creates a pressure gradient. Less air means less air friction and thus an energy saving for the drive.

The spinning rotor has a rotor bottom facing the rear wall of the rotor housing. The narrow gap may continue at least partially along the rotor bottom. With distance from the largest outer diameter, the gap width may change. It is by no means necessary for the gap to continue up to the rotor shaft. There may well be a cavity behind the spinning rotor. Essential to the invention is only that the area behind the spinning rotor is shielded.

Preferably, the spinning rotor at the largest outside diameter has an outer edge and the narrow gap continues axially along the outer edge.

According to a preferred embodiment, the rear wall of the rotor housing is at least partially formed by a replaceable attachment which rests on a boundary wall of the rotor housing. In this way, the rear wall of the rotor housing can be easily adapted to different shapes and diameters of the spinning rotor.

For this purpose, preferably the attachment forms the narrow gap at the largest outer diameter of the spinning rotor with the spinning rotor. The insert is preferably rotationally symmetrical and is arranged centrically to the spinning rotor. The attachment may be cone-shaped, wherein the diameter of the attachment increases from front to back. The essay can also be cylindrical.

The attachment can be attached to a boundary wall of the rotor housing by means of a clip connection, a screw connection, a magnetic force or a press fit. According to a preferred embodiment, the attachment extends to the lateral boundary walls of the rotor housing. This makes a simple attachment possible. Clip or press connections can be easily realized.

However, the present invention can also be realized without an attachment. Then, the rear wall is formed by the rear boundary wall of the rotor housing.

The invention will be explained in more detail with reference to embodiments illustrated in the drawings.

Fig. 1

eine erfindungsgemäße Offenend-Spinneinrichtung mit einem wechselbaren Aufsatz;

Fig. 2

eine erfindungsgemäße Offenend-Spinneinrichtung mit einem alternativen wechselbaren Aufsatz;

Fig. 3

eine erfindungsgemäße Offenend-Spinneinrichtung ohne Aufsatz;

Fig. 4

eine alternative erfindungsgemäße Offenend-Spinneinrichtung ohne Aufsatz;

Fig. 5

eine erfindungsgemäße Offenend-Spinneinrichtung mit einem alternativen Spinnrotor.

Show it:

Fig. 1

an open-end spinning device according to the invention with a replaceable attachment;

Fig. 2

an open-end spinning device according to the invention with an alternative replaceable attachment;

Fig. 3

an open-end spinning device without attachment according to the invention;

Fig. 4

an alternative open-end spinning device without attachment according to the invention;

Fig. 5

an open-end spinning device according to the invention with an alternative spinning rotor.

The figures show open-end spinning devices according to the invention. Since open-end spinning devices are known in principle, the representation of the figures is limited to the components essential to the invention. In the figures, elements with a similar function carry the same reference numerals, even if the elements are designed differently.

The Fig. 1 shows a first embodiment of an open-end spinning device according to the invention. This comprises a forwardly open rotor housing 1 and a spinning rotor 2 arranged therein. In spinning operation, the rotor housing 1 is closed by a cover element, not shown, and is acted upon by a negative pressure supply, not shown, with negative pressure. Facing away from the open side, ie towards the rear, the rotor housing 1 has a passage opening 4 for a rotor shaft 5 of the spinning rotor 2. The rotor shaft 5 and thus the spinning rotor 2 are driven outside of the rotor housing 1.

The rotationally symmetrical spinning rotor 2 comprises a rotor shaft 5 and a spinning cup 13. The spinning cup 13 comprises a rotor bottom 9 and an annular wall section 14. The annular wall section 14 runs conically towards the open end. The largest outer diameter of the spinning rotor 2 is thus located at the transition region between the rotor bottom 9 and the annular wall portion 14. The illustrated spinning rotor 2 has an outer edge 8 at the largest outer diameter.

The embodiment of the Fig. 1 has an attachment 10. The attachment 10 is mounted on the rear boundary wall 11 of the rotor housing 1. The rear wall 3 of the rotor housing 1 is thus partially formed by the attachment 10. The rear wall 3 of the rotor housing 1, in the illustrated embodiment, the attachment 10, conceals the area 7 behind the spinning rotor 2. At the largest outer diameter of the spinning rotor 2, the attachment 10 with the spinning rotor forms a narrow gap 6 with less than 2 mm gap width. The gap width results from the smallest distance of the largest outer diameter of the spinning rotor 2 from the rear wall 3 of the rotor housing 1. In the exemplary embodiment, the gap 6 continues along the rotor bottom 9. The gap 6 also continues axially along the outer edge 8.

The rear wall 3 of the rotor housing 1 shields the area 7 behind the spinning rotor 2 in the interior of the rotor housing 1. The rear wall 3 is formed so that along an imaginary lateral surface about the axis of rotation of the spinning rotor 2 through the largest outer diameter of the spinning rotor no opening is present with the exception of the narrow gap between the spinning rotor 2 and the rear wall. 3

In the in Fig. 1 illustrated embodiment, the article 10 is cone-shaped. The diameter of the rotationally symmetrical attachment 10 increases from the spinning rotor 2 to the rear boundary wall 11. The attachment 10 may also be cylindrical.

The open-end spinning device of Fig. 2 corresponds essentially to the open-end spinning device of Fig. 1 , The two spinning devices differ only in the training of the essay 10. The article 10 of Fig. 2 extends up to the lateral boundary walls 12 of the rotor housing. 1

The embodiment of the Fig. 3 dispenses with a replaceable attachment 10. The rotor housing is constructed in one piece. The rear wall 3 of the rotor housing 1 thus corresponds to the Otherwise, the shape and construction of the open-end spinning device corresponds to the Fig. 2 ,

The Fig. 4 shows a variant without attachment 10. Other than in the previous embodiments, the gap 6 at the largest outer diameter of the spinning rotor 3 is not continued along the outer edge 8 of the spinning rotor. However, the rear wall 3 of the rotor housing 1 and the rotor bottom 9 are formed so that the gap 6 continues along the rotor bottom. This design makes it possible to use 10 spinning rotors 2 with different diameters in the rotor housing 1 even without changeable attachment. The spinning rotors 2 have to have only the same inclination angle on the rotor bottom 9.

The Fig. 5 shows a variant of an open-end spinning device according to the invention with another spinning rotor 2. According to the invention here at the largest outer diameter of the spinning rotor 2, a narrow gap 6 of less than 2 mm gap width between the spinning rotor 2 and the rear wall 3 of the rotor housing 1 is present. As in previous embodiments, the gap 6 also continues along the rotor bottom 9. However, the gap width at the rotor bottom 9 is greater than at the largest outer diameter of the spinning rotor 2. Here again it is clear that it is important in the present invention that the area behind the spinning rotor is shielded or covered. It does not matter that the area behind the spinning rotor 2 is filled by the rotor housing 1.

LIST OF REFERENCE NUMBERS

1

rotor housing

2

spinning rotor

3

Rear wall of the rotor housing

4

Through opening

5

rotor shaft

6

gap

7

Area behind the spinning rotor

8th

Outer edge of the spinning rotor

9

rotor base

10

essay

11

Rear boundary wall

12

Lateral boundary wall

13

spinning cup

14

Ring-shaped wall section

Claims (9)

Open-end spinning device comprising a pressurizable rotor housing (1) and a spinning rotor (2), the rotor housing (1) is open towards the front and closed by a lid member, to the rear, the rotor housing (1) has a rear wall (3) with a Passage opening (4) for a rotor shaft (5) of the spinning rotor (2), characterized in that
that the largest outer diameter of the spinning rotor (2) a narrow gap (6) of less than 2 mm gap width between the spinning rotor (2) and the rear wall (3) of the rotor housing (1) is present and that the rear wall (3) of the rotor housing ( 1) is formed so that in the interior of the rotor housing (1) the area (7) behind the spinning rotor (2) is covered. Open-end spinning device according to claim 1, characterized in that the spinning rotor (2) has a rotor bottom (9) facing the rear wall (3) of the rotor housing (1) and the narrow gap (6) continues at least partially along the rotor bottom (9) , Open-end spinning device according to one of claims 1 or 2, characterized in that the spinning rotor (2) at the largest outer diameter has an outer edge (8) and the narrow gap (6) continues axially along the outer edge (8). Open-end spinning device according to one of claims 1 to 3, characterized in that the rear wall (3) of the rotor housing (1) is at least partially formed by a replaceable attachment (10) which rests on a boundary wall (11) of the rotor housing (1) , Open-end spinning device according to claim 4, characterized in that the attachment (8) at the largest outer diameter of the spinning rotor (2) forms the narrow gap (6) with the spinning rotor (2). Open-end spinning device according to one of claims 4 or 5, characterized in that the attachment (10) is conical or cylindrical. Open-end spinning device according to one of Claims 4 to 6, characterized in that the attachment (10) is fastened to a boundary wall (11, 12) of the rotor housing (1) by means of a clip connection, a screw connection, a magnetic force or an interference fit. Open-end spinning device according to one of claims 4 to 7, characterized in that the attachment (10) extends to the lateral boundary walls (12) of the rotor housing (1). Open-end spinning device according to one of claims 1 to 3, characterized in that the rear wall (3) by a boundary wall (11) of the rotor housing (1) is formed.

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