Guard ring and drive device equipped with guard ring

Abstract

To provide a protective ring that effectively prevents remnants caused by fibers, fiber particles and threads especially onto a shaft and / or support portion of a drive device, and a drive device for a spinning machine.SOLUTION: There is provided a drive device for a spinning machine, the device comprising one motorized drive unit 9 and at least one transmission unit, in which the drive unit for a spinning machine is coupled to another transmission unit using a shaft 3. There are also provided a protection ring 1 and a drive device for a spinning machine: allowing particularly easy monitoring, maintenance and easy replacement of a shaft component of the spinning machine; and effectively preventing remnants caused by fibers, fiber particles and threads especially onto a shaft and / or drive support of the drive device, despite a housing-less design of the shaft. The protective ring comprises: a cylindrical base 5 for arranging the protective ring with a structure in which the ring cannot rotate relative to an axis; and a conical end compartment 6 adjacent to the cylindrical base to cover a binding region 2 without any particular gap and to keep remnant particles and threads away from the binding region.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The invention relates to a protective ring for protecting the connection area between a shaft and a housing component of a spinning machine against yarn winding or contamination.Furthermore, the invention relates to a drive for a spinning machine, which comprises a motor-driven drive unit and at least one transmission unit, the drive unit and / or the transmission unit being connected by means of a shaft to a further component, in particular to another transmission unit.

[0002] Spinning machines, in particular ring spinning machines, often have a number of mutually identical and arranged side-by-side working units, each of which has a spinning unit, and the spinning units and / or components connected to the spinning units or arranged upstream or downstream of the spinning units are often driven via a common drive of the spinning machine. Such a drive is often connected via a shaft to the components to be driven, for example to the rollers of the drafting device arranged upstream of the spinning units, or to a transmission unit. The drive can essentially be a main drive at one end of such a shaft. In particularly long shafts, several further auxiliary drive units are often arranged along the extension length of the shaft, each of which is particularly preferably connected to the shaft of the spinning machine or to the shaft of the components arranged on the spinning machine via at least one main transmission and particularly preferably via a distributed transmission arranged further downstream.

[0003] However, in this case the problem arises that during the spinning process a large number of individual fibres and fibre particles, as well as loose thread ends, arise, which can reach the connection area between the drive unit and the shaft and accumulate there, which after a long time impairs the function of the drive unit and the components connected to it, so that the entire spinning machine with all spinning units must be stopped and the corresponding connections cleaned or even the components replaced.

[0004] From DE 10 2018 102 232 A1, a double-sided ring spinning machine is already known with a drafting device on each machine side, which has several drafting device bottom rollers arranged one after the other in the running direction of the sliver and rotating at different speeds, on which the drafting device bottom rollers can be exerted by a drive arranged on the machine side and at least one additional auxiliary drive, and several working units are arranged next to each other on each machine side, each drafting device being part of one working unit. The auxiliary drive has an electric motor drive, a main transmission and two distributed transmissions, and these components are each connected to each other via a shaft with a universal joint. For protection, this shaft can be arranged completely inside the housing between the components. As a result, the shaft is protected against contamination, especially in the connection area. In many cases, it is a good solution for the shaft to be arranged inside a closed housing, however, in some cases it is also desirable to guide the shaft in the open state, which on the one hand allows for particularly easy monitoring and maintenance of the components, as well as simple replacement, and on the other hand allows for a more flexible design and easier production.

[0005] The problem underlying the present invention is therefore to provide a protective ring and a drive for a spinning machine which allows particularly easy monitoring and maintenance as well as simple replacement of components of the shaft of a spinning machine and which effectively prevents contamination of, in particular, the support parts of the shaft and / or the drive by fibers, fiber particles and threads, in spite of the configuration of the shaft without a housing.

[0006] This object is achieved according to the invention by a protective ring according to claim 1 and by a drive device according to claim 9. Preferred developments of the invention are set out in the dependent claims.

[0007] The protective ring according to the invention, in particular for protecting the connection area between a shaft of a spinning machine or a component arranged on a spinning machine and a housing component against thread winding or contamination, has a cylindrical base body for mounting the protective ring on the shaft in a rotationally immovable manner and a conical end section adjacent to the cylindrical base body for covering the connection area and for keeping contaminating particles and threads away from the connection area, the covering being particularly preferably performed without gaps.

[0008] The drive device according to the invention for a spinning machine, in particular for a drafting device of a spinning machine, particularly preferably for a drafting device of a ring spinning machine, comprises a motor-driven drive unit and preferably at least one transmission unit, the drive unit and / or the transmission unit being connected to a further component, in particular to a further transmission unit, by means of a shaft, and a protective ring according to the invention for protecting the connection area between the shaft and the drive unit and / or the transmission unit, in particular a housing component of the drive unit and / or a housing component of the transmission unit, against yarn windings or dirt is arranged on the shaft so as to be non-rotatable relative to the shaft.

[0009] The protective ring according to the invention offers the advantage that the shaft is essentially as freely accessible as before, and thus can be easily maintained, lubricated and possibly replaced, and at the same time, protection against contamination by fibres, fibre particles and yarns is achieved in the connection area between the shaft and the housing component, so that the device, in particular the spinning machine, can be operated for long periods without interruptions and without frequent maintenance and cleaning in this area. Furthermore, the protective ring can be produced inexpensively and easily assembled, so that a particularly favourable production can be achieved.

[0010] The spinning machine can basically be any machine for producing and / or processing textile fibers or yarns made of textile fibers. Preferably, the spinning machine is a ring spinning machine, and particularly preferably, the protective ring according to the invention is arranged on the spinning machine or on a component of the spinning machine, such as, for example, a drafting device or a winding device. The spinning machine preferably has several working units each with a spinning unit, and each working unit particularly preferably has a specific drafting device or a drafting device is arranged upstream of each spinning unit.

[0011] The drive is essentially provided for driving at least one component of the spinning machine, preferably several components of a spinning machine, via a common shaft. Very particularly preferably, the drive drives the components arranged in the respective working units of the spinning machine via a shaft. In this case, the drive can be a main drive, preferably having a drive unit arranged at one end of the shaft to be driven. Alternatively, the drive can also be an auxiliary drive, preferably for at least one draft roller of the spinning machine, in particular for the draft bottom roller, which is arranged supplementary to the main drive in the extension direction of the shaft, in particular in the central region of the shaft. Particularly preferably, the auxiliary drive is provided for supporting the main drive and / or for preventing twisting of a very long shaft.

[0012] The drive preferably has one main transmission and particularly preferably also at least one distributed transmission. However, very particularly preferably, the drive includes one distributed transmission for each side of the double-sided spinning machine. Particularly preferably, the drive is configured with one main transmission and exactly two distributed transmissions, which are further preferably arranged in close proximity to one another. Correspondingly, the transmission unit can be either a main transmission or a distributed transmission.

[0013] The drive unit of the drive is primarily a device that provides a rotary drive, an electric motor being suitable as the drive unit. Particularly preferably, the drive unit is provided for directly driving a shaft and / or for driving a component of the spinning machine by means of a shaft. To transmit the rotation to the shaft, the drive unit has an output shaft, an output bush or other possibilities for fixing the shaft non-rotatably relative to the shaft. The drive unit is preferably coupled to at least one transmission unit. Alternatively or additionally, two transmission units of a drive can also be coupled to one another by means of a shaft, in which case the first transmission unit is preferably a main transmission and the second transmission unit coupled to the first transmission unit via a shaft is particularly preferably a distributed transmission.

[0014] The shaft can essentially be any component or any group of components for transmitting the rotation of a drive unit or a transmission unit to another component of the spinning machine. The shafts of the spinning machine, in particular the shafts for connecting the drive unit and / or the transmission unit, are preferably connecting elements capable of flexural movements or have such a coupling. Particularly preferably, the shafts are cardan shafts and / or have at least one universal joint and / or constant velocity joint.

[0015] The protective ring is essentially a component provided for protecting the connection area between the shaft of the spinning machine and a housing component. The housing component may be part of any component unit of the spinning machine that does not rotate with the shaft, preferably part of the housing of the drive unit and / or the transmission unit. The housing component is accordingly preferably a drive housing, a bearing housing or a transmission housing. Furthermore, the housing component preferably has a flat surface in the region of the shaft or in the region provided for connecting with and / or receiving the shaft, against which the conical end section of the protective ring can be arranged in a contacting, particularly sliding manner. The preferably sliding arrangement of the conical end section on the housing component of the spinning machine is particularly problem-free at low rotational speeds, which occur, for example, in the drives of the drafting cylinders and drafting rollers of spinning machines, in particular ring spinning machines, the rotational speeds of which at the drafting cylinders and drafting rollers are particularly preferably less than 20 revolutions per minute.

[0016] The coupling area is essentially an area adjacent to the drive unit and / or transmission unit, in which at least partly a shaft, in particular one end of such a shaft, is arranged which cooperates with the drive unit and / or transmission unit. The coupling area likewise preferably extends directly between a surface of the housing component, which preferably extends perpendicularly to the central longitudinal axis of the shaft, and a surface of the shaft. Particularly preferably, the protective ring, in particular a conical end section, covers at least one bearing element, in particular a transmission bearing, and / or at least one shaft seal component, in the protected coupling area.

[0017] The protective ring is essentially arranged and / or configured in such a way that the connection area between the shaft and the housing component is protected against contamination with fibers, fiber particles, dust particles and threads by means of the protective ring and / or such that contamination reaching the connection area from the outside, in particular threads, cannot reach into the connection area. Preferably, contamination reaching the outside of the connection area is kept away from the connection area. Particularly preferably, the protective ring is configured to be arranged on a cardan shaft, which is particularly preferably arranged on the transmission output shaft.

[0018] The protective ring may essentially be made of any material, preferably at least a part of the protective ring, in particular the base body, and particularly preferably the entire protective ring, is made of a plastic, preferably a thermoplastic, particularly preferably polyoxymethylene (POM).

[0019] In order to arrange the protective ring on the shaft in a non-rotatable manner, the protective ring has a cylindrical base body. The cylindrical base body preferably has a constant inner and / or outer diameter along its central longitudinal axis over its entire length. More preferably, the cylindrical base body has a wall that is closed over the entire circumference. The inner wall of the cylindrical base body can have a completely circular cross section or can be adapted to the shape of the shaft. Particularly preferably, the cylindrical base body extends over the entire length of the protective ring up to the conical end section, and very particularly preferably, the protective ring is formed exclusively from the cylindrical base body and the conical end section. Correspondingly, the cylindrical base body preferably forms one side or end of the protective ring, and the conical end section forms the other side or end of the protective ring. It is also preferred that the cylindrical base body has a cylindrical end, in particular at the end of the base body that is located opposite the conical end section, and particularly preferably, the cylindrical end has the same inner and / or outer diameter as the remaining cylindrical base body.

[0020] In order to cover the bonding area and to keep contaminating particles and threads away from the bonding area, the protective ring has a conical end section. The conical end section preferably has a diameter that expands or increases towards the outside and / or away from the cylindrical base body. The conical end section can be formed with a constant wall thickness over the entire conical area or with a wall thickness that decreases towards the end or continuously over the entire conical area. Furthermore, at least the outer surface of the conical end section, and particularly preferably also the inner surface, has a conical shape. Particularly preferably, the protective ring has its largest inner and / or outer diameter in its outermost area or at the end that has the conical end section. The conical end section can be part of a separate component that is fixed to the cylindrical base body or part of a corresponding component group, but preferably the conical end section is formed integrally with the cylindrical base body or is at least materially connected to the base body.

[0021] In a preferred configuration of the protective ring, the conical end section has an abutment surface at the outer end of the protective ring, which is arranged perpendicular to the central longitudinal axis of the cylindrical base body or the entire protective ring and / or perpendicular to the rotation axis of the shaft in order to enable the protective ring to be arranged so that it slides against the housing component and at the same time covers the connection area without any gaps, whereby a particularly good and complete coverage of the connection area and a correspondingly extensive protection are achieved. Preferably, the connection area is completely closed by the protective ring and the housing component. Generally, it is preferred that the protective ring is arranged on the one hand non-rotatably on the shaft and on the other hand slidably on the housing component.

[0022] In another preferred configuration of the protective ring, it is proposed that the length of the conical end section is 1% to 75%, preferably 2% to 50%, particularly preferably 3% to 20%, very particularly preferably 5% to 15% of the length of the protective ring, in which case, on the one hand, a good retention of the protective ring on the shaft is achieved, and on the other hand, contaminating particles and threads are sufficiently kept away from the area of ​​the shaft directly adjacent to the housing component. The length of the conical end section is preferably also related to the components to be covered under the end section, and particularly preferably, the entire components for connecting and / or fixing the shaft are arranged inside the conical end section. The length of the protective ring is in particular in the direction along the central longitudinal axis of the protective ring and / or the cylindrical basic body.

[0023] In order to keep threads and other contaminants away from the connection region particularly effectively and to prevent the formation of thread windings around the outer surface of the protective ring, the conical end section of a preferred configuration of the protective ring has a conical outer surface with a smooth surface, a straight surface and / or a surface angled with respect to the rotation axis of the protective ring arranged on the shaft or with respect to the central longitudinal axis of the protective ring, in particular with respect to the central longitudinal axis of the protective ring and / or the shaft. The conical outer surface is in particular provided to keep thread windings accumulating around the end region of the shaft away from the bearing housing or the transmission housing. Particularly preferably, the entire surface of the protective ring is formed smoothly, straight and / or without edges, and the base body may have only one bent region between the conical end section and the cylindrical base body.

[0024] The conical outer surface of the protective ring may first have an arbitrarily curved and / or angled course, however, the angle is preferably invariant or constant over the entire conical end section, in particular over the entire conical outer surface. Particularly preferably, the angle of the conical end section, in particular the angle of the conical outer surface, relative to the central longitudinal axis of the protective ring, the cylindrical base body and / or the shaft is between 20° and 85°, preferably between 40° and 75°, particularly preferably between 45° and 65°, in such a configuration that particles reaching the conical outer surface are subjected to a sufficiently large force in the direction of the cylindrical base body and thus away from the bonding area.

[0025] According to a preferred development of the protective ring according to the invention, the outer diameter, in particular the maximum outer diameter, of the conical end section is 5% to 100%, preferably 10% to 75%, particularly preferably 20% to 50% larger than the outer diameter of the cylindrical base body, which also ensures a reliable slip-off of threads and dirt at the conical end section. Furthermore, the outer diameter of the conical end section in the section adjacent to the base body particularly preferably corresponds to the outer diameter of the base body, so that there is no step at the transition between the two regions. The maximum outer diameter of the conical end section is preferably located in the region of the abutment surface.

[0026] In order to be able to arrange the guard ring on the shaft in a particularly simple and stable manner so that it cannot be rotated relative to the shaft, the basic body, and particularly preferably the entire guard ring, is preferably shaped integrally and / or rotationally symmetrically, in particular rotationally symmetrically with respect to the central longitudinal axis of the guard ring and / or with respect to the rotation axis of the shaft, which further allows a particularly simple and inexpensive production of the guard ring.

[0027] Basically, any fixing of the protective ring on the shaft is possible, but in a preferred embodiment, it is proposed that the base body of the protective ring is provided and / or configured so that the rotation-resistant fixing on the shaft is achieved by press-fitting, for which the base body preferably has a completely cylindrical shape and / or an inner diameter that is constant over its entire length, which is particularly preferably smaller than the outer diameter of the shaft. The inner diameter is preferably 0.01% to 5%, particularly preferably 0.05% to 3%, very particularly preferably 0.1% to 2% smaller than the outer diameter of the shaft on which the protective ring is to be fixed rotation-resistant. Basically, the protective ring is fixed rotation-resistant on the shaft in a force-locking manner. Alternatively, the inner diameter can also correspond to the outer diameter of the shaft, possibly with a tolerance, in which case the rotation-resistant fixing must be achieved in another way, for example in a form-locking and / or material-locking manner.

[0028] In order to achieve a stable fixation of the guard ring on the shaft, in particular by press fitting, the wall thickness of the guard ring is constant at least in the region of the cylindrical base body, preferably over the entire region of the guard ring, more preferably between 0.5 mm and 5 mm, particularly preferably between 1 mm and 3 mm, very particularly preferably between 1.5 mm and 2.5 mm, at least in the region of the cylindrical base body, preferably over the entire region of the guard ring, in which case a sufficiently high stability and stresses can be achieved.

[0029] Next, one embodiment of a protective ring according to the present invention will be described in detail with reference to the drawings. [Brief description of the drawings]

[0030] [Figure 1] FIG. 2 shows a schematic view of a protective ring arranged in the joining area between the shaft and the housing component;

[0031] A protective ring 1, which is shown diagrammatically in FIG. 1, is arranged on one end of a cardan shaft 3, by means of which a connection area 2 between the cardan shaft 3 and a motor housing 4 can be protected against contamination. The cardan shaft 3 is part of a ring spinning machine, more precisely part of an auxiliary drive for a drafting device of such a ring spinning machine. In the ring spinning machine, a number of identical working units are arranged next to each other, each of which has a drafting device with a number of drafting device rollers and a subsequent spinning device. All the drafting device rollers are driven by means of a common shaft, which is coupled to a main drive and at least one auxiliary drive. Each auxiliary drive has an electric motor as part of a drive unit 9, as well as a main transmission and two distributed transmissions, the drive unit 9 being coupled to the main transmission and the main transmissions to the respective distributed transmissions, respectively, via the cardan shaft 3. The drive unit 9 is arranged inside the motor housing 4.

[0032] The protective ring 1 is provided in such a way as to prevent the ingress of fibre particles and threads into the connection area 2, thereby preventing contamination of the support of the motor output shaft 10 arranged in the connection area 2. For this purpose, the protective ring 1 is fixed at one end of the cardan shaft 3 in the region of the output shaft 10 of the drive unit 9 so as not to be able to rotate relative to it. The fixing of the protective ring 1 on the cardan shaft 3 takes place via a cylindrical base body 5 of the protective ring 1.

[0033] In order to be able to protect the bonding area 2, the protective ring 1 has a conical end section 6 adjacent to the cylindrical base body 5, at which the inner and outer diameters of the protective ring 1 expand uniformly. On the outside, the conical end section 6 has a conical outer surface 8 with a smooth surface, which allows the threads that reach the area of ​​the conical outer surface 8 to slide off from the bonding area 2 and thus prevent the formation of thread windings.

[0034] In order to achieve the tightest possible joint between the guard ring 1, which rotates together with the cardan shaft 3, and the surface of the motor housing 4 which is in contact with the guard ring 1, the guard ring 1 has an abutment surface 7 at the end of the conical end section 6 which is oriented perpendicular to the central longitudinal axis M of the cardan shaft 3 or of the guard ring 1 and parallel to the surface of the motor housing 4, so that the guard ring 1 can be guided by the abutment surface 7 in a sliding manner against the motor housing 4. This results in a gap-free cover. Due to the low rotational speed of the cardan shaft 3, below 20 revolutions per minute, strong wear of the guard ring 1 also does not have to be a concern.

[0035] In order to make it particularly simple and inexpensive to produce, the protective ring 1 is made in one piece from polyoxymethylene. The protective ring 1 has a rotationally symmetrical shape as well as a closed, i.e. continuous, surface and a constant wall thickness. [Explanation of symbols]

[0036] 1 Protective Ring 2 Combined area 3-axis 4 Housing components 5 Cylindrical base 6 Conical end segments 7 Contact surface 8 Cone-shaped exterior 9 Motorized drive unit 10 Output shaft M Central longitudinal axis

Claims

1. A drive for a spinning machine, comprising one motor-driven drive unit (9) and at least one transmission unit, the drive unit (9) and / or the transmission unit being coupled to another transmission unit by means of a shaft (3), a protective ring (1) for protecting a connection area (2) between the shaft (3) and a housing component (4) of the drive unit (9) and / or a housing component (4) of the transmission unit against windings or dirt is arranged on the shaft (3) in a rotationally immovable manner, The protective ring (1) comprises a cylindrical base (5) for positioning the protective ring (1) on the shaft (3) so as not to rotate relative to the shaft (3), and a conical end section (6) adjacent to the cylindrical base (5) for covering the bonding area (2) and keeping contaminating particles and yarns away from the bonding area (2).

2. 2. The drive device for a spinning machine according to claim 1, wherein the conical end section (6) has an abutment surface (7) at the outer end of the protective ring (1), the abutment surface (7) being arranged perpendicular to the central longitudinal axis (M) of the cylindrical basic body (5) so that the protective ring (1) can be arranged so that it slides against the housing component (4) and at the same time covers the connection area (2).

3. 3. Drive device for a spinning machine according to claim 1 or 2, characterized in that the length of the conical end section (6) is between 3% and 20% of the length of the protective ring (1).

4. 4. The drive device for a spinning machine according to claim 1, wherein the conical end section (6) has a conical outer surface (8) with a straight surface in a cross section including the central longitudinal axis of the protective ring (1) and / or a surface angled with respect to the central longitudinal axis of the protective ring (1) in order to direct the yarn away from the housing component (4) in the coupling region (2).

5. 5. Drive device for a spinning machine according to claim 1, characterized in that the angle of the conical end section (6) to the central longitudinal axis (M) of the cylindrical base body (5) is between 45° and 65°.

6. 6. Drive device for a spinning machine according to claim 1, characterized in that the maximum outer diameter of the conical end section (6) is 20% to 50% larger than the outer diameter of the cylindrical base body (5).

7. 7. The drive device for a spinning machine according to claim 1, wherein the cylindrical basic body (5) is formed in one piece and rotationally symmetrical.

8. 8. Drive device for a spinning machine according to claim 1, characterized in that the wall thickness of the protective ring (1) is constant at least in the region of the cylindrical basic body (5) and is between 1 mm and 3 mm.

9. 9. The drive device for a spinning machine according to claim 1, wherein the cylindrical base body (5) of the protective ring (1) is provided for being fixed to the shaft (3) by press-fitting so as to be non-rotatable relative to the shaft (3), and for this purpose the cylindrical base body (5) has an inner diameter which is constant over its entire length and which is smaller than the outer diameter of the shaft (3).

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