EP0717132B1 - Open-end spinning machine - Google Patents

Description

The invention relates to an open-end spinning machine with a Plenty of jobs arranged side by side, some supported on a support disc bearing, in one vacuum-loaded rotor housing revolving spinning rotor as well as a sliver opening device with one in one Have swivel housing rotating opening roller, which Rotor housing to the front by a swivel Canopy arranged fiber channel plate is closable and arranged below one in the swivel housing Dirt outlet opening a dirt disposal facility is attached.

Such open-end spinning machines are known and for example in the "AUTOCORO" manual from the company Schlafhorst described in detail and on pages 1.1.0 to 1.1.3 shown in the drawing. As on the manual page 1.3.20 is shown below the sliver opening devices Spinning units of the rotor spinning machines a machine-long, all-round dirt removal belt arranged, the on Dirt removal channel of the swivel housing picks up and attached to a machine end Dirt transfer point transported where the belts emptied become.

It is also known in the field of Sliver opening devices instead of mechanical ones Pneumatic waste disposal facilities Arrange dirt suction devices.

DE 21 12 170 A1 describes, for example Rotor spinning device, with one between the feed roller and a sliver fed to a feed trough by a Opening roller is broken down into individual fibers. In this process dirt particles and fibers are also largely separated. The opening roller transports both components via one Fiber guide surface in the area of a dirt outlet opening. During this transport, both the fibers and the Dirt particles through the opening roller or through an air flow circulating with the opening roller in the shortest possible time Time at approximately circumferential speed of the opening roller accelerates. The mass particles, as fibers and Dirt particles, due to the effects on them Centrifugal force striving to make the circular path tangential leave as soon as the inevitable mechanical guidance is interrupted, as in the area of Dirt outlet opening of the opening roller housing happens.

Immediately below the dirt outlet opening is a Dirt collecting space arranged, which via a connection channel a central suction device of the spinning machine is connected is.

A comparable open-end spinning device which is somewhat modified in the area of the dirt outlet opening is described in DE 28 56 058 C2.
In order to prevent in addition to the dirt particles also spinnable fibers from the opening roller in the area of the dirt outlet opening, the dirt outlet opening is also designed here as a suction opening for an air flow entering the opening roller housing. This air flow directed onto the opening roller holds the fibers, which have a relatively large specific surface area in relation to their small mass, as it were, as a pneumatic guide, on the opening roller. The dirt particles, which, due to their size and mass, have a significantly higher kinetic energy, overcome this air flow and are thrown away tangentially.

The dirt particles are then thrown away by Another air flow is detected and via a suction opening dissipated. Directly after the dirt outlet opening a dirt chamber is arranged on the opening roller housing, through an air baffle that is at a short distance from Dirt outlet opening is arranged in a Dirt separation zone and a dirt removal zone divided is.

DE 43 10 810 A1 is also an OE rotor spinning device with one below the opening roller arranged dirt chamber known, the two separate Air flow systems with their own intake openings having. An effective one in the bottom area of the dirt chamber The air flow system disposes of the opening roller combed dirt particles while a second oppositely effective air flow system in one with the Dissolving roller flows around the suction flow. The special one Arrangement of the suction opening leads to a more or less clear separation of the two flow systems.

Furthermore, in the post-published DE 43 34 483 Open-end spinning device described in the cover element the spinning unit arranged opening roller housing that is pivotable with the cover element. The Opening roller housing has a dirt outlet opening, the one opposite a pneumatically actuated Dirt pickup element is assigned. Between the Dirt outlet opening and the dirt receiving element is a clearance associated with the ambient air intended. The dirt collecting element is detachable on the attached to a pivot axis mounted cover member and is when opening the spinning device together with the Cover element tipped down around the swivel axis.

A pneumatic dirt disposal device for an open-end spinning device is also described in DE-A 20 18 744.
In this known device, an air chamber is connected to the dirt outlet opening of its sliver opening device and is connected to a vacuum source via a suction line. The air chamber has a series of openings which are connected to the outside air and form a so-called secondary air intake point. The air flow entering the secondary air suction point and the suction air flow initiated by the vacuum source form a neutral zone in the area of the air chamber, which can only be passed through by dirt particles that were previously released by the opening roller from the sliver and thereby accelerated to the peripheral speed of the opening roller.

The dirt separation on the opening roller housing Rotor spinning machine poses with regard to a flawless Processing fiber is an important element. Although the technology of the dirt separators appears relatively simple, these are Facilities after all very difficult, sensitive to Devices responding to changes. Already small Modifications in the area of the dirt outlet openings can and thus have a lasting change in the flow conditions a significant influence on the achievable spinning results.

Starting from open-end spinning devices of the above described genus, the invention has for its object to create a pneumatic waste disposal facility, that can be used universally.

This object is achieved by a device solved, as described in claim 1.

Advantageous embodiments of the invention are the subject of Subclaims.

The inventive design of the pneumatic dirt suction device has the advantage, among other things, that subsequent installation of the device is also possible on those rotor spinning machines which were originally designed for mechanical dirt disposal. Design changes in the area of the spinning stations are not necessary for this. This means that the new dirt suction device makes it possible to equip a rotor spinning machine with either a mechanical or a pneumatic dirt disposal device, the selection made being able to be corrected at a later point in time if necessary. An existing mechanical dirt disposal system can, for example, be easily replaced by the pneumatic dirt suction device according to the invention.
The special design of the dirt suction device according to the invention and the way in which it is attached to the spinning units ensure that all the functions of the spinning units, in particular the opening of the top for cleaning the spinning station, are in no way impaired. The pneumatic dirt suction device arranged below the swivel housing of the rotor spinning units essentially consists of a dirt holding funnel, which is connected directly or indirectly via a rear suction nozzle to a machine-length dirt duct under vacuum. The dirt holding funnel has a transverse fastening strip with bores, via which the holding funnel can be fixed to a support strip arranged on the spinning units. If necessary, the guide duct parts of a mechanical dirt disposal device are also attached to these support strips.

In an advantageous embodiment it is also provided that the dirt hopper as an asymmetrical injection molded part, is preferably made of plastic. Such a thing designed component can easily on the one hand design of existing OE spinning machines be adapted, on the other hand, such injection molded parts, what with the multitude of spinning positions of such machines is also advantageous to manufacture inexpensively.

The rear suction port of the dirt funnel is in a preferred embodiment, just below the support rail Rotor spinning units guided to the rear and via a line, for example a spiral hose etc. to the vacuum-loaded dirt duct connected.

In a further embodiment of the invention, the dirt channel designed as a machine-long suction traverse, which in the Machine longitudinal axis of the spinning machine, for example below a channel for the energy supply is arranged. Of the Dirt channel is a preferred version on the machine end to a spinning device's own suction device connected, including a filter device and has a vacuum source.

Fig. 1 eine Zwischeneinheit einer OE-Rotorspinnmaschine mit einem Schmutzkanal sowie einer schematisch dargestellten spinnereieigenen Absaugeinrichtung,

Fig. 2 perspektivisch eine Rotorspinneinheit mit einem Schmutzaufnahmetrichter unterhalb des Schwenkgehäuses,

Fig. 3 eine Seitenansicht einer mit der erfindungsgemäßen pneumatischen Schmutzabsaugeinrichtung ausgestatteten Rotorspinneinheit,

Fig. 4 eine Draufsicht auf einen Schmutzaufnahmetrichter.

Further details of the invention can be found in an exemplary embodiment illustrated below with reference to the drawings. It shows:

1 shows an intermediate unit of an OE rotor spinning machine with a dirt channel and a schematically illustrated spinning device suction device,

2 is a perspective view of a rotor spinning unit with a dirt holding funnel below the swivel housing,

3 shows a side view of a rotor spinning unit equipped with the pneumatic dirt suction device according to the invention,

Fig. 4 is a plan view of a dirt hopper.

1 shows an intermediate unit 2 of an open-end rotor spinning machine 1.
Such rotor spinning machines each have a drive unit (not shown) and an end unit (also not shown) and up to twelve of the intermediate units 2 shown. As shown, each of these intermediate units 2 has twenty-four workplaces 3 (twelve on each side). The work stations 3 each have an OE rotor spinning unit 4 and a winding device 5.

As further shown in FIG. 1, each intermediate unit 2 a suction channel 6 through which, for example, the rotor housing 20 of the rotor spinning units 4 are subjected to negative pressure become. An electronics channel 7 is located below the suction channel 6 and a dirt channel 8 arranged. The dirt channel 8, the is designed as a machine-long suction traverse, is attached to a spinner's own suction device 9 connected under other a vacuum source 10, a filter element 11 and has a dirt disposal 12. To the dirt channel 8, as indicated by dashed lines in Fig. 1, the pneumatic Dirt extraction devices 13 of the rotor spinning units 4 connected.

The rotor spinning units 4 are shown in more detail in FIGS. 2 and 3.
As is known, a spinning rotor 17 is mounted on a support disk bearing 15 with its rotor shaft 16. An axial bearing 18 is also provided to absorb axial forces. The spinning rotor 17, which is driven by a tangential belt 19, rotates at high speed in the rotor housing 20, which is connected to the suction channel 6 via a connecting line 21. The rotor housing 20 is closed at the front by a fiber channel plate 22 which is fastened to a pivotable top 23. A thread draw-off nozzle 25 is arranged in the center of an extension 24 of the fiber channel plate 22. In addition, a two-part fiber guide channel 26 opens into the extension 24, which connects the sliver opening device 27 to the interior of the spinning rotor 17.
The top 23 can be pivoted about the pivot axis 29 in the direction S after loosening a bolt 28 and thereby tilted into a first cleaning position or a second maintenance position.

The sliver opening device 27 consists essentially of an opening roller 31 rotating in a swivel housing 30, a sliver feed cylinder 32 and one Sliver feed trough 33. The sliver 34 becomes the Sliver opening device 27 via a compressor 35 fed. The swivel housing 30 surrounding the opening roller 31 is partially open, that is, it faces one down directed dirt outlet opening 36.

Spaced below the swivel housing 30 is one Pneumatic dirt suction device 13 arranged to a support bar 37 of the rotor spinning unit 4 can be fixed. The dirt suction device 13 has an asymmetrical shaped dirt hopper 38 on a rear suction nozzle 39 on the negative pressure Dirt channel 8 of the rotor spinning machine 1 is connected.

As can be seen in particular from FIG. 4, the Dirt holding funnel 38 both in the area of his Receptacle as well as in its rear connection area constructed asymmetrically. The dirt hopper points also in the upper area with a mounting strip 40 Mounting holes 41 on. Via the mounting holes 41 can the dirt receiving funnel 38 on the support bar 37 of the Rotor spinning units 4 are set.

Between the dirt outlet opening 36 of the swivel housing 30 and the dirt holding funnel 38 is formed in the installed state a freely accessible room for pneumatic dirt extraction, the undisturbed entry of an intake flow into the Opening roller housing 30 allows. The intake flow is thereby by the suction flow in the suction nozzle 39 in in no way adversely affected.

Claims (9)

1. Open-end spinning machine with a plurality of work stations (3) arranged adjacent to one another, which respectively comprise a rotor spinning unit with a spinning rotor (17) supported on a support disc bearing (15) and rotating in an underpressurised rotor housing (20), and a sliver combing device (27) with a combing cylinder (31) rotating in a pivot housing (30), wherein the rotor housing (20) can be closed at the front by a fibre channel plate (22) arranged on a pivotable hood, and undemeath a dirt outlet opening (36) arranged in the pivot housing (30) a dirt removal device is secured,
   characterised in that

   on the rotor spinning unit (4) a support strip (37) is arranged, onto which, by means of suitable fastening means, either a channel section of a mechanical dirt removal device or the dirt collecting funnel (38) of a pneumatic dirt suction device (13) can be secured, and

   in that the dirt collecting funnel (38) is spaced apart from the dirt outlet opening (36) of the pivot housing (30) and is connected by a suction connection point (39) to a machine-length dirt channel (8), wherein the dirt suction device (13) is designed and is secured onto the rotor spinning unit (4) such that the opening of the hood (23) of the rotor spinning unit (4) is not hindered in any way.
2. Open-end spinning machine according to claim 1, characterised in that the support strip (37) has fastening bores (41) in which bolts for example can be secured.
3. Open-end spinning machine according to claim 1 and 2, characterised in that the dirt collecting funnel (38) has a rear suction connection point (39) arranged off-centre and a fastening strip (40) arranged in the upper region of the funnel (38) for locking onto the support strip (37).
4. Open-end spinning machine according to one of claims 1 to 3, characterised in that the dirt collecting funnel (38) is designed to be asymmetrical.
5. Open-end spinning machine according to claim 4, characterised in that the dirt collecting funnel (38) is designed as an injection moulding.
6. Open-end spinning machine according to claim 4 and 5, characterised in that the dirt collecting funnel (38) is made of plastic.
7. Open-end spinning machine according to one or more of the preceding claims, characterised in that the suction connection point (39) grips under the support strip (37) and is connected by a flexible line to the underpressurised dirt channel (8) of the open-end spinning machine (1).
8. Open-end spinning machine according to claim 7, characterised in that the flexible line is designed as a spiral hose.
9. Open-end spinning machine according to claim 7, characterised in that the dirt channel (8) is designed as a machine-length suction cross bar which is connected on the machine end side to a spinning mill own suction device (9).

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