WO2018215885A1

WO2018215885A1 - Drum for a carding machine

Info

Publication number: WO2018215885A1
Application number: PCT/IB2018/053411
Authority: WO
Inventors: Emil Medvetchi; Esther SPALINGER
Original assignee: Maschinenfabrik Rieter Ag
Priority date: 2017-05-24
Filing date: 2018-05-16
Publication date: 2018-11-29
Also published as: CH713802A1; CN110621817B; DE112018002673A5; CN110621817A

Abstract

The invention relates to a drum (5) for a carding machine (1), having a cylindrical drum shell (13), that has a wall thickness (a), with a longitudinal axis (14) and an axial length (l), and having a hub (23) arranged on the longitudinal axis (14), wherein the drum shell (13) is connected in its interior (15) to the hub (23) by spokes (18) at at least two points (16, 17) that are arranged at a distance (b) from one another on the longitudinal axis (14). The spokes (18) are arranged at an inclination (β) with respect to a radial (24) applied perpendicularly to a tangent to the drum shell (13) through the longitudinal axis (14) and at a slant (α) with respect to a plane (19) arranged perpendicularly to the longitudinal axis (14). At each point (16, 17), three to twelve spokes (18) are provided, which are arranged at an inclination (β) of 3 to 15 degrees and at a slant (α) of zero to 30 degrees.

Description

Drum for a card

The invention relates to a drum for a card with a, having a wall thickness, cylindrical drum shell, which is connected in the interior with at least two extending in the radial direction spokes, which are seen in the axial direction of the drum, arranged at a distance to each other.

In order to achieve a carding effect as efficient as possible in a card, it is necessary to keep the carding gap as small as possible, especially in the Hauptkardierzone between a set of Kardierelementes, such as a flat bar, and the set of card drum (also called Tambour). The clothing of the carding drum is applied by special Aufziehverfahren and fastening methods on the outer circumference of the drum of the card. To achieve high production volumes, the speeds of card drums have been increased more and more in recent years. That In the meantime card pulleys are used with speeds of more than 600 rpm.

By increasing the speeds, the centrifugal forces on the drum of the carding (carding drum) are increased, which cause uneven elastic deformations in the diameter range of the drum of the card due to the uneven stresses occurring. The strongest deformations occur in the areas where the drum shell reinforced by spokes, respectively, is connected to a drive shaft. Due to the non-uniform elastic deformations in the drum area that occur, the carding nip set at rest may change in the operating state, resulting in deterioration of the carding due to loss of carding surface as well as collisions of the trimmings and thus damaging the carding drum or the carding drum working together Carding elements can lead. To counteract this, various solutions have already been proposed in the patent literature. For example, EP 0 446 006 A1 proposes the use of a drum for a card, which is composed of a plurality of profiles in lightweight construction. The use of inherently rigid modules, which are assembled into a drum shell, reduces the influence of the centrifugal force on the outer surface of the drum shell. However, the construction is very complicated and expensive and also requires a time-consuming assembly work. Furthermore, it is known from the prior art to use so-called drum bottoms as reinforcing elements. Drum trays are introduced into the interior of the drum shell radial discs, as disclosed for example in DE 199 25 285 A1. Also known are star-shaped arrangements of S-shaped spokes, these serve to compensate for operational heating of the drum shell. A disadvantage of these known designs is the radially rigid connection of the drum shell to the inner hub, which makes it impossible to expand due to the centrifugal forces occurring.

It is therefore an object of the invention to propose a device which eliminates the disadvantages of the known prior art and also allows larger drum speeds in the card without undesirable non-uniform deformations occurring in the region of the drum circumference of the card drum due to high centrifugal forces. The object is achieved by a drum having the features of the independent claim. In this case, a drum for a card is proposed with a, having a wall thickness, cylindrical drum shell having a longitudinal axis and with a hub arranged in the longitudinal axis, wherein the drum shell in its interior with the hub to at least two spaced from each other on the longitudinal axis locations is connected by spokes which are opposite to a radially to a tangent to the drum shell through the longitudinal axis applied radials with an inclination and with respect to a perpendicular to the longitudinal axis an ordered level with a slope are arranged. Three to twelve spokes are provided at each point, which are arranged with an inclination of 3 to 15 degrees and with a slope of zero to 30 degrees. The slope of zero angular degrees is equivalent to the fact that the spokes are provided in a plane perpendicular to the longitudinal axis of the drum plane.

The direction of the spoke is determined by a straight line connecting the points where the spoke meets the hub and the drum mantle. As points are to be understood as the intersections of a geometric center line of the spoke with the outer surface of the hub respectively the inner surface of the drum shell. The angle enclosed between this straight line and the radial corresponds to the inclination of the spoke.

Due to the inclination of the spokes with respect to the radials, radial expansion of the drum shell due to the centrifugal forces is not prevented, even at the point where the spokes are arranged. The effect of the centrifugal forces, the spokes are practically taken away from the drum shell and change in their inclination relative to the radial. This corresponds to a radial extension of the spokes, resulting in a uniform expansion of the drum shell over the course of the longitudinal axis of the drum. Constrictions of the drum shell at the points of the spokes, which occur when using drum bottoms or conventional spokes, can be avoided by the novel arrangement of the spokes. The arrangement of the spokes with a bevel can stabilize the

Drum jacket to be improved in the direction of the longitudinal axis. The slopes are opposite in two places with spokes to choose and are preferably zero to ten degrees. However, the skewed arrangement of the spokes increases the design and manufacturing effort considerably, making skew of zero angular degrees a particularly preferred embodiment. To improve the transverse stability, it is advantageous if ribs projecting on at least one side of the spokes in the direction of the longitudinal axis are provided. The ribs provide a stiffening of the spokes in their transverse direction and prevent their deformation in the transverse direction of the spoke, which corresponds to the direction of the longitudinal axis of the drum. The spokes themselves should not be subject to deformation, since this in turn could result in an uneven change in slope or slope. For the determination of the slope of the course of the ribs is not relevant, since the ribs represent a negligible effect on the deformation behavior of the spoke due to the centrifugal forces.

Advantageously, the spokes are formed in straight or curved or kinked form. Due to the simplicity, the straight shape of the spokes is particularly preferred. It is also advantageous to form the spokes with a cross section tapering from the longitudinal axis in the direction of the drum shell.

As a result, a better dynamic behavior and in addition a material saving can be achieved.

The number of spokes used depends on the dimensions of the drum and the design of the spokes themselves, the more spokes are used, the smaller their cross-section can be. An increase in the number of spokes leads to better behavior under the influence of centrifugal forces and thus to a further homogenization of the expansion of the drum shell. Preferably, an odd number of spokes are used to prevent stresses in the manufacture of the drum or spokes by a casting process. In a sheet metal construction, this aspect is not relevant and it can also be an even number of spokes are used. The best results to avoid constrictions of the drum shell have been shown in a use of five to nine spokes. Also, the proposed arrangement of the spokes allows a reduction in the wall thickness of the drum shell. Advantageously, the drum jacket has a uniform wall thickness of 5 mm to 20 mm, particularly preferably 12 mm. Preferably, the spokes are arranged with an inclination of 5 to 10 degrees, more preferably 7 degrees. This tendency has given the best values with regard to the elasticity of the spokes. With the prevailing speeds and dimensions of the carded drums, an inclination of 7 degrees of angled led to a uniform widening of the drum shell due to the influence of centrifugal forces. Cardan drums have an axial length of 900 mm to 2000 mm and a diameter of 800 mm to 1 '500 mm. The distance between the points at which advantageously spokes are arranged is from 0.4 times to 1, 0 times the axial length of the drum. An arrangement of the spokes at the respective drum ends is quite possible.

Advantageously, the hub has a bearing for supporting the drum on a shaft at at least two points which are provided with spokes. The hub has a passage opening for receiving a shaft. Alternatively, the hub itself may be formed as a shaft. In this case, the hub may be formed for each spoked location as a stub shaft or as a continuous over the entire longitudinal axis of the drum shaft.

The drum can be made as a casting with hub and spokes in one piece. Advantageously, however, the drum shell is made of a steel sheet and welded to the spokes, wherein the weld is provided via a circumferential ring. Preferably, the circumferential ring with the ribs is made in one piece from a metal sheet. Also in the region of the hub, it is advantageous to connect the ribs to the hub via a ring encircling the hub, wherein the ring can be formed on the hub or on the ribs.

The use of the drum according to the invention in a card is proposed. In an inventive design of the spokes, the direction of rotation of the drum in the card is not decisive, the proposed construction shows in both directions of rotation of the drum an improvement in dimensional accuracy and dimensional stability of the drum shell. Further advantages of the invention will be shown and described in more detail with reference to subsequent embodiments. Show it

Figure 1 is a schematic side view of a card;

Figure 2 is a schematic sectional view A-A of an embodiment of the drum;

Figure 3 is a schematic view of an embodiment of the drum in cross section; Figure 4 is a schematic view of another embodiment of the drum in

Cross section and

Figure 1 shows a schematic side view of a card 1 with a feed chute 2, via which the fiber material in the form of a nonwoven fabric is fed to a feed roller 3. The fiber material is delivered from the feed roller 3 to a licker-in 4 which transfers the fiber material to a carding drum 5 (called "drum" for short) of the card 1. The fiber material entrained by the drum 5 passes through the rotary movement of the drum 5 shown by an arrow in the region of a main carding zone 7, which is formed in cooperation with a revolving deck unit 6 arranged circumferentially above the drum 5. The direction of rotation of the revolving deck aggregate 6 is indicated by an arrow The revolving deck unit 6 is provided with revolving flat bars 11, shown schematically. Subsequent to the main carding zone 7, the carded fiber material passes into the region of a rotatably mounted pickup 8, which transfers the fiber material removed from the drum 5 to a rotatably mounted pickup roller 9. The pickup roller 9 conveys the, from the consumer 8 removed fiber material not shown in detail Guide devices to a subsequent press roller pair 10, which emits the fiber well to a belt-forming device 12. The sliver formed in the tape forming apparatus 12 is transferred to a not shown tape tray and stored in cans. Figure 2 shows a schematic sectional view at the point AA of Figure 1 of an embodiment of the drum 5. The drum 5 has a longitudinal axis 14 and has a cylindrical drum shell 13 with a constant over the axial length of the drum I wall thickness a. Due to the cylindrical shape of the drum 5 whose drum casing 13 forms a arranged around the longitudinal axis 14 interior 15. The drum shell 13 is supported in the interior 15 at the points 16 and 17 via spokes 18 on a hub 23 from. In the embodiment shown, a separate hub 23 is shown for the points 16 and 17, which is also designed as a stub axle. However, alternatives are also conceivable, for example a shaping of the hub as a continuous axle or shaft, as well as a design of the hubs, each with a passage opening, which is suitable for a rotationally secure receiving a shaft or a bearing. The points 16 and 17 are arranged at an axial distance b from each other. The spokes 18 are connected on the one hand to the drum shell 13 and on the other hand to the hub 23, in the embodiment shown, the compound is formed as a weld 21.

At the point 16, the spokes 18 are shown with a bevel α greater than zero degrees of angle, whereas the spokes 18 at the point 17 have a slope α of zero angular degrees. The points 16 and 17 are shown to illustrate different ways of arranging the spokes 18 different. In fact, however, the spokes 18 are in their oblique α mirror image to perform. The slope α corresponds to the angle which is enclosed by a perpendicular to the longitudinal axis 14 arranged plane 19 and a plane in which the spoke 18 is arranged.

Figure 3 shows a schematic view of an embodiment of the drum 5 in a cross section perpendicular to the longitudinal axis 14 of the drum 5. The cylindrical shape of the drum 5 is formed by the drum shell 13 with a wall thickness a. In the interior 15 of the drum 5, five spokes 18 are arranged by way of example around a centrally positioned hub 23. The spokes 18 are connected on the one hand to the hub 23 and on the other hand to the drum shell 13. For uniform connection of the spokes 18 with the drum shell 13, the spokes 18 are connected to a ring 25th which is welded to the drum shell 13. The welding of the spokes 18 to the hub 23 is also provided via an annular assembly of the spokes 18 about the hub 23. The spokes 18 are arranged with a slope ß with respect to a radial 24. Radial 24 corresponds to a line passing through longitudinal axis 14 of the drum and perpendicular to a tangent to drum shell 13. The inclination β corresponds to the angle enclosed by the radial 24 and a straight line connecting the points at which the spoke meets the hub 23 and the drum shell 13. The points of intersection of a geometric center line of the spoke 18 with the outer surface of the hub 23 and the inner surface of the drum shell 13 are to be understood as points.

The spokes 18 are shown in a straight longitudinal extent with a tapered from the hub 23 to the drum casing 13 width. The outer ring 25 for connecting the spokes 18 to the drum shell 13 and the inner union of the ribs around the hub 23 are designed with the spokes 18 as a one-piece component. In this case, the component can be formed from sheet metal or produced as a casting. In addition, the individual spokes 18 have ribs 20 for their reinforcement. The ribs 20 may be applied to the spokes 18 or formed on the spokes 18. For the determination of the inclination ß the course of the ribs 20 is not relevant. In a correspondingly strong design of the spokes 18 can be dispensed with additional ribs 20. As already described in the exemplary embodiment of FIG. 2, an arrangement of the spokes 18 with a bevel α is also possible in the exemplary embodiment of FIG.

FIG. 4 shows a schematic view of a further embodiment of the drum 5 in a cross section perpendicular to the longitudinal axis 14 of the drum 5. The cylindrical shape of the drum 5 is formed by the drum casing 13 with a wall thickness a. In the interior 15 of the drum 5, five spokes 18 are arranged by way of example around a centrally positioned hub 23. The spokes 18 are connected on the one hand to the hub 23 and on the other hand to the drum shell 13. For uniform connection tion of the spokes 18 with the drum shell 13, the spokes 18 are connected to a ring 25 which is welded to the drum shell 13. The welding of the spokes 18 to the hub 23 is also provided via an annular assembly of the spokes 18 about the hub 23.

The spokes 18 are arranged with a slope ß with respect to a radial 24. Radial 24 corresponds to a line passing through longitudinal axis 14 of the drum and perpendicular to a tangent to drum shell 13. The determination of the connecting line between the points at which the spoke 18 meets the outer surface of the hub 23 and the inner surface of the drum shell 13 is the same as described in FIG.

The spokes 18 are shown in a kinked shape with a constant from the hub 23 to the drum shell 13 width. The outer ring 25 for connecting the spokes 18 to the drum shell 13 and the inner connection of the spokes 18 to the hub 23 are designed with the spokes 18 as a one-piece component. In this case, the component can be formed from sheet metal or produced as a casting. As already described in the exemplary embodiment of FIG. 2, an arrangement of the spokes 18 with a bevel α is also possible in the exemplary embodiment of FIG.

However, it is also another embodiment within the scope of the invention possible, wherein the spokes 18 have a different shape, such as a curved course, or in the region of the drum shell 13 or the hub 23 without a ring 25 or an annular assembly of the individual spokes 18 with the drum shell 13 and the hub 23 are connected. Also, other methods such as a welding method for connecting spokes 18, drum shell 13 and hub 23 are conceivable, for example a detachable connection or gluing. reference numeral

1 card

2 feed chute

3 feed roller

4 lapses

5 carding drum (drum)

6 traveling deck unit

7 main carding zone

8 customers

9 pick-up roller

10 press roller pair

1 1 flat bar

12 band-forming device

13 drum casing

14 longitudinal axis

15 interior

16 place with spoke

17 place with spoke

18 spoke

19 level

20 rib

21 welding

22 storage location

23 hub

24 radials

25 ring

a wall thickness

b Spacing of the spokes

I axial length

α Slope of the spoke ß Slope of the spoke

Claims

claims

1 . Drum (5) for a card (1) having a cylindrical drum shell (13) with a wall thickness (a), a longitudinal axis (14) and an axial length (I), and a hub arranged in the longitudinal axis (14) (23), where the

Drum shell (13) in its interior (15) with the hub (23), at least two at a distance (b) to each other on the longitudinal axis (14) arranged points (16, 17), by spokes (18) is connected, which opposite to a radially to a tangent to the drum shell (13) by the longitudinal axis (14) applied Radial (24) with an inclination (ß) and with respect to a perpendicular to the longitudinal axis (14) arranged plane (19) with a slope (a ) are arranged, characterized in that at each point (16, 17) three to twelve spokes (18) are provided, which with an inclination (ß) of 3 to 15 degrees and with a slope (a) from zero to 30 degrees are arranged.

2. drum (5) for a card according to claim 1, characterized in that the spokes (18) are formed in a straight or curved or kinked shape.

3. drum (5) for a card according to claim 1 or 2, characterized in that the drum shell (13) has a uniform wall thickness (a) of 5 mm to 20 mm, preferably 12 mm.

4. drum (5) for a card (1) according to one of the preceding claims,

characterized in that at each point (16, 17) five to nine spokes (18) are provided.

5. drum (5) for a card (1) according to one of the preceding claims,

characterized in that the spokes (18) are arranged with an inclination (ß) of 5 to 10 degrees.

6. drum (5) for a card (1) according to one of the preceding claims, characterized in that on at least one side of the spokes (18) in the direction of the longitudinal axis (14) projecting ribs (20) are provided.

7. drum (5) for a card (1) according to one of the preceding claims,

characterized in that at least at two points (16, 17) which are provided with spokes (18), the hub (23) has a bearing point (22) for supporting the drum (5) on a shaft.

8. drum (5) for a card (1) according to one of the preceding claims,

characterized in that the spokes (18) are arranged with a slope (a) of zero angular degrees.

9. drum (5) for a card (1) according to one of the preceding claims,

characterized in that the spokes (18) are provided with a tapering from the longitudinal axis (14) in the direction of the drum shell (13) cross-section.

10. drum (5) for a card (1) according to one of the preceding claims,

characterized in that the drum shell (13) made of a steel sheet and welded to the spokes (18), wherein the weld (21) via a circumferential ring (25) is provided.

1 1. Carding machine (1) with a drum (5) according to one of the preceding claims.