CN110195273B

CN110195273B - Feeding device for carding machine

Info

Publication number: CN110195273B
Application number: CN201910138119.8A
Authority: CN
Inventors: R.毕索夫; P.杰里内
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2018-02-26
Filing date: 2019-02-25
Publication date: 2022-11-29
Anticipated expiration: 2039-02-25
Also published as: EP3530781B1; CH714679A1; EP3530781A1; CN110195273A

Abstract

The invention relates to a feeding device for a carding machine. The filling channel output device is used for supplying the fasciculus into the feeding conduit from the filling channel of the carding machine, has an opening roller with a shaft and an axial working length, has a feeding roller at the upstream of the opening roller, and has an air supply device which is provided with a fan and an air supply conduit. The air supply duct has a cross-section with a width increasing in the direction of the axis of the opening roller and a height perpendicular to the width. The air supply duct is composed of a first part and a second part. The second part of the air supply duct is arranged at least partially tangentially to the opening roller, has a longitudinal extension extending from the first part in the direction of the end opposite the first part, and reaches at least the plane of the opening roller, passing through its axis and perpendicular to the lower wall opposite the opening roller, or exceeds this plane.

Description

Feeding device for a carding machine

Technical Field

The invention relates to a filling channel output device for feeding a fiber strand from a filling channel of a carding machine to a feed conduit, having an opening roller, a feed roller and an air supply device with a fan and an air supply conduit.

Background

The carding machine produces a carding sliver from the fibrous material fed to it, which is subsequently further processed into threads. However, it is also possible to produce nonwovens instead of carding slivers. Carding machines are usually provided with a filling channel supplied with fibres from a blowing chamber through a transport system. The fibers are transported in the form of fiber bundles. The filling channel is filled continuously or on demand with a fibre tow from the transport system. In most cases pneumatic transport systems are used. With the aid of the feeding device, the fiber strand is introduced from the filling channel into the carding machine in the form of a wad. The uniformity of the filling entering the carding machine plays an important role in the requirements of the service life of the working elements of the carding machine and the carding quality. The uniformity of the sliver or nonwoven produced by the carding machine is also affected by the uniformity of the charge entering the carding machine. The weight of the charge entering the carding machine is another important technical variable in the carding process. The amount of filler weight and the feed speed of the filler into the carding machine have a significant influence on the production capacity of the carding machine and on the carding quality.

A feed roll for continuously withdrawing the fibre tows from the filling channel is arranged in the lower part of the filling channel. The fibre bundle drawn from the filling channel by the feed roll is sent to the feed duct via the opening roll for additional opening and homogenization. In the feed duct, the fibre tow is shaped with the aid of compressed air to form a homogeneous wad formation suitable for being fed to a carding machine. A fan is also provided as an adjunct to the feeding apparatus, the fan allowing for increased pressure in the feeding conduit and thereby allowing for compaction of the fiber bundle into a plug.

Due to the weight of the fiber bundle and the pressure created by the fan in the feeding duct, the fiber bundle is compacted into a filler. The air flowing into the feeding duct due to the fan is drawn out of the feeding duct at its end through the air-permeable wall. From the prior art according to CH 681 371 A5 a feeding device of a carding machine is known, in which the fibre bundle from the filling channel (reserve channel) is discharged via a feed roller and an opening roller to the feed conduit (feed channel) of the carding machine. Compaction air is also introduced into the feed conduit for transporting and compacting the fiber bundle on the opening roller. The compacting air is directed tangentially to the surface of the opening roller and passes over a portion of the surface of the opening roller before entering the feed conduit with the fiber bundle. One disadvantage here is the uneven air flow due to uneven coverage of the opening rollers.

CH 690 651 A5 also discloses a feed device to a carding machine, in which the conveying air and the compacting air also pass tangentially through the opening rollers. Furthermore, the air flow passing in the direction of movement of the surface of the opening roller serves to provide pneumatic support for the separation of the fiber bundle from the needles of the opening roller. One disadvantage of the disclosed air flow is that the amount of air passing along the opening roller is not constant or controllable or adjustable due to the variable coverage of the opening roller by the fiber bundle. This has an effect on the transport of the bundle in the feeding duct and on the compaction of the fibre bundle into a filling at the end of the feeding duct.

Disclosure of Invention

It is therefore an object of the present invention to create a filled channel output device for feeding fibre tows from a filled channel of a carding machine into a feeding duct, allowing to controllably add transport air and compacting air to the feeding duct without being affected by the covering of the opening rollers and still achieving an even distribution of the compacting air in the feeding duct.

This object is achieved by the filling channel output device according to the invention.

A filling channel output device for feeding a fiber strand from a filling channel of a carding machine into a feed duct is proposed, having an opening roll with a shaft and an axial working length, having a feed roll upstream of the opening roll and having an air supply device with a fan and an air supply duct. The air supply duct has a cross section with a width expanding in the direction of the axis of the opening roller and a height perpendicular to the width as seen. The air supply duct is composed of a first part and a second part. The second member is arranged at least partially tangentially to the opening roller, has a longitudinal extension extending from the first member in the direction of the end opposite the first member, and has a length at least up to or beyond the plane of the opening roller, which is perpendicular to the lower wall opposite the opening roller and leads through the axis of the opening roller. Since the length of the proposed air supply duct exceeds the plane of the opening roll, an air supply to the fiber strand is achieved which is independent of the movement of the opening roll. Because the fibre bundle is transported away from the opening roller provided with needles due to the centrifugal force generated by the rotation of the opening roller, and the fibre bundle is then only influenced by the air flow. The air velocity here is lower than the circumferential velocity of the opening roller at its needle point. The air flow is also influenced only to a small extent by the rotating opening roller. A uniform air flow is achieved over the entire axial working width of the opening roll. The air flowing into the feeding duct causes suction which acts on the discharge area of the opening roller and which supports the discharge of the fibre bundle, despite the guide projecting beyond the plane of the opening roller. Furthermore, due to the uniform distribution of the compacting air in the feeding duct, a homogeneous compacting of the fiber bundles into the filling in the feeding duct is achieved and an automatic collection of the filling by the feeding device of the carding machine is ensured.

The feed rolls are preferably provided with all-steel card clothing and have a diameter of 200 mm to 300 mm, preferably 250 mm. Due to the fact that the feed roll has a larger diameter than conventional feed rolls, a higher conveying rate can be achieved at a lower withdrawal speed. This contributes to a more gentle treatment of the fibres and facilitates take-over of the fibres by the downstream opening roll.

The first part of the air supply duct is advantageously designed as a diffuser having a first cross section at the outlet of the fan and a second cross section at the transition to the second part of the air supply duct. The first cross section corresponds in size to the fan outlet and the second cross section has a width corresponding to the axial working length of the opening roller. The diffuser is designed such that the cross-section becomes wider in the direction of the axis of the opening roll and smaller in the direction perpendicular to the axis of the opening roll. In this way, a uniform air flow over the entire cross section can be achieved.

At the location of the transition from the first part to the second part of the air supply conduit, the air supply conduit preferably has a width of 1200 mm to 1600 mm and a height of 20 mm to 150 mm. The width here corresponds to the working width of the downstream carding machine.

It is also advantageous if a regulating element is provided between the first part and the second part of the air supply conduit or in the first part. Examples of regulating elements here include valves, gate valves or elements which partially close the cross section. The adjusting element can be used to reduce the cross section and to influence the air flow. For example, on the one hand the cross-section and thus also the air flow is influenced by the use of a screen or grid, and on the other hand the flow conditions are influenced by the use of a screen or grid. This makes it possible to correct not only the control of the air flow or air pressure, but also the inclination position of the flow.

The adjusting element is preferably a gate valve, which can be embodied as a simple metal plate clamped between the flanges of the two parts of the air supply conduit, so that the metal plate can be pushed into the free cross section after the flanged connection is released. Automation of the adjustment by means of additional actuators is also conceivable. In order to achieve lower air velocities when the air stream impinges on the fiber bundle, the adjusting element should be set as far away as possible from this location.

Furthermore, it is suggested that the lower wall of the second part of the air supply duct facing away from the opening roller, when seen in the flow direction, should have a step with a step depth for an abrupt change in the height of the air supply duct upstream of the plane of the opening roller. With the help of the step, the volume/pressure ratio of the air flowing into the feed conduit is influenced. In addition, the step affects the flow conditions at the transition of the air from the air supply conduit to the feed conduit. Expansion of the air becomes possible through the step, which results in a drop in the flow rate. The step depth is preferably adjustable and amounts to between 0 mm and 25 mm. Adjustability can be achieved by replacing the corresponding duct parts or by introducing air baffles.

The opening roll is provided with a hood which ensures the transition from the feed roll to the feed conduit. The wall of the second part of the air supply duct facing the opening roller is advantageously connected to the hood, which partially surrounds the opening roller, by means of a baffle. The baffle plate effects the separation between the opening roller and the air supply duct. The baffle is preferably removably attached to the second part of the air supply conduit or to the shroud. This allows adjusting the distance between the end of the flap and thus the air supply duct and the plane of the opening roller. The distance can be adjusted by shifting, pivoting or replacing the flap.

The baffle forms the end of the air supply duct and advantageously projects a distance above the plane of the opening roller. The distance is preferably 10 mm to 50 mm. Depending on the behavior of the fibrous material in the discharge of the fiber bundle from the opening roller, the distance can be adjusted according to the product to be processed.

Furthermore, a carding machine with a filling channel is proposed, wherein a filling channel output is provided in the filling channel according to the preceding description.

Drawings

Additional advantages of the present invention are described based on the following illustrated and explained embodiments, wherein:

FIG. 1 shows a schematic side view of a prior art carding machine;

figure 2 shows a schematic side view of a filling channel output according to the invention;

FIG. 3 shows a schematic side view of an air supply device according to the invention;

fig. 4 shows a schematic partial view of the air supply device according to fig. 3 in the direction X.

Detailed Description

Fig. 1 shows a rotary flat card 1, which is equipped with a filling channel 2, a filling channel output 5 and a feed conduit 3. The fibre bundle 4 enters the filling channel 2 after it has passed through the various processing steps of the blowing chamber. The fibre bundle 4 is forwarded to the feed conduit 3 by a filling channel output 5, which filling channel output 5 comprises a feed roll 6 and an opening roll 7 and an air supply 8. An air supply device 8 is provided in the filling channel output 5 to support the forward advance of the fibre bundle 4 to the feed conduit 3 and to ensure the compaction of the filling upstream of the feed device 10 of the carding machine 1. An air supply device 8 blows air tangentially along the opening roll 7 into the feeding duct 3 and thereby compacts the fibre bundle into the appearance of the wadding upstream of the feeding device 10 of the carding machine 1. An air supply device 8 blows air tangentially along the opening roller 7 into the feed conduit 3 and thereby compacts the fibre bundle 4 into a wad with a high wad weight, as required for further processing in the carding machine 1. The air blown by the air supply device 8 flows through the fiber bundle 4 and/or the filler 11 discharged into the feeding duct 3. This air stream leaves the feeding conduit 3 through the air permeable region 9 of the wall at the end of the feeding conduit 3.

A feeding device 10 downstream of the feeding duct 3 feeds the fibre strand, now in the form of a homogeneous charge formation 11, to a licker-in module 12 of the card 1. The feeding apparatus 10 is provided with a feed roll having a diameter of 100 mm to 150 mm, preferably 130 mm. The fibre bundle from the filler formation 11 discharged from the feeding device 10 is further opened by the spike device comprised in the spike roller module 12 and at the same time some of the contaminants comprised therein are removed. The last licker-in roller of the licker-in module 12 finally transfers the fibres to a carding drum 13, which carding drum 13 completely loosens and parallelizes the fibres. The carding drum 13 thus cooperates with the hood unit 14. After some fibers have made multiple revolutions on the carding drum 13, they are removed by doffer cylinder 15, sent to sliver forming unit 16 and finally deposited in a sliver can (not shown) in the form of a carding sliver 17.

Fig. 2 shows a schematic side view of a filling channel output 5 according to the invention. The fibre tows 4 in the filling channel 2 are fed by means of feed rolls 6 to opening rolls 7. In order to ensure a metered removal of the fibre tows 4 from the filling channel 2, the feed roll 6 cooperates with a feed trough 18. The fiber bundle 4 received from the feed roll 6 is sent into the feed duct 3 by the opening roll 7. In doing so, the fiber bundle 4 is thrown off the needles of the opening roller 7 due to the centrifugal force created by the rotation of the opening roller 7 about its axis 31. As a result, the fiber bundle 4 is caught by the air flow and transported through the feed conduit 3 in the flow direction 29. The air flow 8 is generated by a fan 26 and sent to the feeding duct 3 through an air supply duct 28. The air flow 8 is again taken out of the feeding duct 3 in the air permeable area 9 of the wall of the feeding duct 3 and is then returned to the fan 28 via the air duct 30.

The air supply duct 28 is composed of the first part 20 and the second part 21. The first component 20 is designed as a diffuser and is connected to a fan 26. The adjusting element 23 is arranged between the first part 20 and the second part 21 of the air supply conduit 28. For the second part 21 of the air supply duct 28, a step 22 having a step depth D is provided in the lower wall 25 before the point where the air flow 8 enters the feed duct 3. The cross-section of the air supply duct 28 is sharply increased by the step 22, which results in an expansion of the air and thus in a reduction of the air velocity. The air speed of the air stream 8 is reduced to less than the circumferential velocity of the needles mounted on the opening rollers 7, so that the influence of the air stream 8 on the process of discharge from the bundle of opening rollers 7 is minimized. The step depth D is designed to be adjustable. The wall opposite the lower wall 25 of the second part 21 of the air supply duct 28 is provided with a baffle 24 in the area of the opening roller 7. The flap is connected to the cover 27 of the opening roller 7. Due to the baffle 24, the air flow 8 passes the opening roller 7 to the feeding duct 3. The guide is arranged beyond the plane 19 of the opening roll, as seen in the flow direction 29 of the fibre bundle. The plane 19 of the opening roller is an imaginary plane through the axis 31 of the opening roller 7, which extends over the length of the opening roller 7 at right angles to the lower wall 25 of the second part 21 of the air supply duct 28. The flap 24 protrudes beyond the plane 19 of the opening roller by a distance a, as seen in the flow direction 29. The flap 24 is arranged so that its distance a from the plane 19 of the opening roller is adjustable.

Fig. 3 and 4 show a schematic representation of the air supply duct 28 of the filling channel outlet 5 according to the invention, wherein fig. 4 shows a partial view in the X direction of the air supply duct 28 in fig. 3. The air supply duct 28 is composed of a first part 20 and a second part 21 and a regulating element 23 arranged therebetween. The first component 20 is designed as a diffuser which in one dimension decreases from the flange cross section of the fan to a height H and in another dimension widens to a width C, wherein the width C corresponds to the axial length of the opening roll or the width of the feed duct. A step 22 having a step depth D is provided in the lower wall 25 of the second part 21 and results in an abrupt increase in the height H of the air supply duct 28. The boundary of the air supply duct 28 opposite the lower wall 25 is provided with a baffle 24. The flap 24 protrudes beyond the plane 19 of the opening roller by a distance a, as seen in the flow direction 29. The plane 19 of the opening roller is an imaginary plane through the axis 31 of the opening roller 7, which is perpendicular to the lower wall 25 of the second part 21 of the air supply duct 28. The baffle 24 is designed to be adjustable so that, for example, the distance a can be adjusted to a shortened distance B.

The present invention is not limited to the embodiments illustrated and described herein. Modifications are possible within the scope of the patent claims, such as combinations of features, even if these features are illustrated and described in different embodiments.

List of reference numbers:

1. rotary cover plate carding machine

2. Filling channel

3. Feeding catheter

4. Fiber bundle

5. Output device for filling channel

6. Feed roll

7. Opening roller

8. Air flow

9. Breathable region of wall

10. Feeding device

11. Filler formation

12. Licker-in module

13. Carding machine drum

14. Cover unit

15. Doffer cylinder

16. Tampon-forming unit

17. Cotton sliver of carding machine

18. Feeding trough

19. Plane of opening roller

20. First part of air supply conduit

21. Second part of air supply conduit

22. Step

23. Adjusting element

24. Baffle plate

25. Lower wall of the second part of the air supply duct

26. Fan with cooling device

27. Cover

28. Air supply duct

29. Direction of flow

30. Air conduit

31. Axis of the opening roller

Distance of A baffle

Shortened distance of B baffle

Width of C supply conduit

Depth of D step

H height of the air supply duct.

Claims

1. A filling channel output device (5) for supplying a fibre strand (4) from a filling channel (2) of a carding machine (1) into a feed conduit (3), having an opening roll (7) with an axis (31) and an axial working length, having a feed roll (6) upstream of the opening roll (7) and having an air supply device (8), the air supply device (8) has a fan (26) and an air supply duct (28), wherein the air supply duct (28) has a cross section with a width (C) that increases in the direction of the axis (31) of the opening roller (7) and a height (H) perpendicular to the width (C), characterized in that the air supply duct (28) is composed of a first part (20) and a second part (21), wherein the second part (21) is arranged at least partially tangentially to the opening roller (7), having a longitudinal extension extending from the first part (20) in the direction of the end opposite the first part (20), and at least to the plane (19) of the opening roller or beyond said plane (19), said plane (19) passing through said axis (31) of said opening roller (7) and being perpendicular to a lower wall (25) opposite to said opening roller (7).

2. Filling channel output device (5) according to claim 1, characterized in that the first part (20) of the air supply duct (28) is designed as a diffuser having a first cross section at the outlet of the fan (26) and a second cross section at the transition to the second part (21) of the air supply duct (28), wherein the first cross section corresponds in its dimensions to the fan outlet and the second cross section has a width (C) corresponding to the axial working length of the opening roller (7).

3. Filling channel output device (5) according to claim 1 or 2, characterized in that the air supply duct (28) has a width (C) of 1200 to 1600 mm and a height of 20 to 150 mm at the location of the transition from the first part (20) to the second part (21) of the air supply duct (28).

4. Filling channel output device (5) according to claim 1 or 2, characterized in that a regulating element (23) is provided between the first part (20) and the second part (21) of the air supply duct (28) or in the first part (20).

5. Filling channel output (5) according to claim 4, characterized in that the regulating element (23) is a gate valve.

6. Filling channel output device (5) according to claim 1 or 2, characterized in that a lower wall (25) of the second part (21) of the air supply duct (28) facing away from the opening roller (7) has a step (22) with a step depth (D) such that there is an abrupt change in height (H) upstream of the plane (19) of the opening roller, seen in the flow direction (29).

7. Filling channel output device (5) according to claim 6, characterized in that the step depth (D) is adjustable between 0 mm and 25 mm.

8. Filling channel output device (5) according to claim 1 or 2, characterized in that the wall of the second part (21) of the air supply duct (28) facing the opening roller (7) is connected to a hood (27) partly surrounding the opening roller (7) by a flap (24).

9. The fill channel output device (5) according to claim 8, characterized in that the flap (24) is detachably attached to the second part (21) of the air supply duct (28) or to the hood (27).

10. The fill channel output device (5) according to claim 8, characterized in that the flap (24) protrudes beyond the plane (19) of the opening roller by a distance (A, B), wherein the distance (A, B) amounts to 10 to 50 mm.

11. Carding machine (1) with a filling channel (2), characterised in that a filling channel output (5) according to any of claims 1 to 10 is provided in the filling channel (2).