SPINNING DEVICE, ROTOR SPINNING MACHINE, AND METHOD FOR PREVENTING THE ACCUMULATION OF FIBRES IN A SPINNING DEVICE

Abstract

A spinning device for producing a yarn from a fiber material, a rotor spinning machine having at least one spinning device, and a method for preventing the accumulation of fibers inside a rotor housing of a spinning device. The spinning device has a rotor housing, a spinning rotor arranged inside the rotor housing and revolving at high speed during the spinning operation, and a rotor housing lid arranged on the rotor housing for opening and closing the rotor housing, wherein a device for generating at least one flow of sealing gas is also arranged, at least in portions, inside the rotor housing in a region of the rotor housing at the rear of the spinning rotor, in order to prevent fiber material and/or a loop of fibers getting behind the spinning rotor when the spinning rotor is braked and/or the rotor housing lid is opened.

Claims

1. A spinning device for producing a yarn from a fiber material, the spinning device comprising: a rotor housing; a spinning rotor arranged within the rotor housing and revolving at high speed during spinning operation; a rotor housing lid arranged on the rotor housing for opening and closing the rotor housing; and a flow device arranged at least in portions within the rotor housing for generating at least one flow of sealing gas in a region at a rear of the spinning rotor, in order to prevent fiber material and/or a loop of fibers from entering the spinning rotor when the spinning rotor is braked and/or when the rotor housing lid is opened.

2. The spinning device for producing the yarn according to claim 1, wherein the flow device for generating the at least one flow of sealing gas has at least one blowing channel arranged on the rotor housing and directed toward the rear of the spinning rotor.

3. The spinning device for producing the yarn according to claim 1, wherein the flow device has between 6 and 8 blowing channels for generating the at least one flow of sealing gas.

4. The spinning device for producing the yarn according to claim 3, wherein the blowing channels are arranged on the rotor housing in a circular and/or uniform manner about an axis of rotation of the spinning rotor.

5. The spinning device for producing the yarn according to claim 3, wherein an angle of the blowing channels in each case in relation to an axis of rotation of the spinning rotor is between 0 and 45.

6. The spinning device for producing the yarn according to claim 3, wherein the blowing channels are connected to a ring-shaped air distributor which is formed as a structural unit together with the rotor housing, and is connected to a compressed air connection on an outside of the rotor housing.

7. A rotor spinning machine having at least one spinning device according to claim 1.

8. The rotor spinning machine according to claim 7, wherein each spinning rotor is individually driven and/or mounted contactlessly.

9. A method for preventing the accumulation of fibers within a rotor housing of a spinning device, the method comprising: arranging a spinning rotor within the rotor housing and revolving the spinning rotor at high speed during spinning operation; arranging a rotor housing lid on the rotor housing for opening and closing the rotor housing; and before the rotor housing is opened and/or when the spinning rotor is braked, directing a flow of sealing gas to a region of the rotor housing at a rear of the spinning rotor in order to prevent fiber material and/or a loop of fibers from getting behind the spinning rotor.

10. The method for preventing the accumulation of fibers within the rotor housing of the spinning device according to claim 9, further including deactivating the flow of sealing gas during a spinning process for producing a yarn from a fiber material by the spinning rotor, and activating the flow of sealing gas at a predetermined time between 1 second and 5 seconds before the rotor housing is opened.

11. The method for preventing the accumulation of fibers within the rotor housing of the spinning device according to claim 9, further including deactivating the flow of sealing gas during the spinning process for producing a yarn from a fiber material by the spinning rotor, and activating the flow of sealing gas when the spinning rotor is braked, as a function of the rotor speed, when a rotor speed drops below 20,000 1/min.

12. The method for preventing the accumulation of fibers within the rotor housing of the spinning device according to claim 9, further including deactivating the flow of sealing gas at a predetermined time between 1 second 5 seconds after the rotor housing has been opened.

13. The method for preventing the accumulation of fibers within the rotor housing of the spinning device according to claim 9, wherein the flow of sealing gas is activated before a vacuum applied to a spinning operation within the rotor housing is shut off.

Description

[0029] An embodiment of the device according to the invention for generating at least one flow of sealing gas in a spinning station is explained in more detail below with reference to the drawings. In the drawings:

[0030] FIG. 1 is a perspective view of a rotor housing, with a spinning rotor and a device for generating at least one flow of sealing gas of a spinning device, and

[0031] FIG. 2 is a perspective sectional view of the rotor housing shown in FIG. 1, with a device for generating at least one flow of sealing gas.

[0032] A spinning device of a rotor spinning machine, shown in portions in FIG. 1, has at least one spinning rotor 2 revolving at high speed during the spinning operation, which spinning rotor is arranged within a rotor housing 1. For the spinning operation, the rotor housing 1 is closed and a vacuum is applied. In order to be able to open the rotor housing 1, a rotor housing lid is provided which is arranged pivotably on the rotor housing 1.

[0033] For spinning a yarn from a fiber material, singulated fiber material is supplied to the spinning rotor 2. If the spinning operation is to be interrupted, the spinning rotor 2 is braked, so that the rotor housing 1 can then be opened. However, if the spinning rotor 2 falls below a number of revolutions that typically lies in the range between 50,000 1/min and 20,000 1/min, the centrifugal forces no longer suffice to keep the fiber material located in the spinning rotor 2 therein, so that a fiber accumulation, in particular a loop of fibers, can reach the interior of the rotor housing 1 of the spinning rotor 2. If the loop of fibers is in a region in front of the spinning rotor 2 or between the spinning rotor and an openable rotor housing lid, this is unproblematic, since the loop of fibers is removed when the rotor housing 1 is opened. If, on the other hand, the loop of fibers or the accumulation of fibers approaches a region behind the spinning rotor 2, and in particular moves into the region of the spinning rotor axis, an electric spinning rotor drive and/or a magnetic spinning rotor bearing, a malfunction can occur, in particular when the spinning rotor 2 is restarted.

[0034] In order to prevent this, a device 3 for generating a flow of sealing gas is arranged behind the spinning rotor 2 in the region of the rotor housing 1 (see FIG. 1), by means of which device a plurality of flows of sealing gas can be directed toward a region behind the spinning rotor when the spinning rotor is braked 2, so that no loop of fibers and no accumulations of fibers can get into this region protected in this way. For this purpose, eight blowing channels 5 of the device 3 for generating a flow of sealing gas are arranged in the correct direction along a circle around the spinning rotor axis on the rotor housing 1 downstream of the spinning rotor 2 (see FIG. 2) in such a way that, by means of each of the blowing channels 5, a flow of sealing gas can be directed toward the rear of the spinning rotor 4, so that the flows of sealing gas flow along a region between the rear wall of the rotor housing 1 and the rear of the spinning rotor 4, and then flow further radially along the rear of the spinning rotor 4 toward the front side of the spinning rotor 2, so that no loops of fibers can reach this region. In this case, an outlet opening of each blowing channel 5 is arranged at an angle of about 30 with respect to the axis of rotation of the spinning rotor 2, and radially away from the spinning rotor center.

[0035] To supply the individual blowing channels 5 with compressed air, these are connected in the interior of the wall of the rotor housing 1 to a ring-shaped air distributor 6 which is supplied via a compressed air connection 7 arranged on the outside of the rotor housing 1. All blowing channels 5 and in particular all openings of the blowing channels 5 for the discharge of sealing gas are accordingly formed identically to one another and/or have a round cross section.

LIST OF REFERENCE SIGNS

[0036] 1 Rotor housing [0037] 2 Spinning rotor [0038] 3 Device for generating a flow of sealing gas [0039] 4 Rear of the spinning rotor [0040] 5 Blowing channel [0041] 6 Air distributor [0042] 7 Compressed air connection