CN110462120B

CN110462120B - Feed tank and feed device

Info

Publication number: CN110462120B
Application number: CN201880024231.2A
Authority: CN
Inventors: P.杰里耐克; C.穆勒
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2017-04-13
Filing date: 2018-03-27
Publication date: 2022-06-07
Anticipated expiration: 2038-03-27
Also published as: EP3610059A1; CH713690A1; CN110462120A; WO2018189607A1

Abstract

The invention relates to a feed chute (5) for a feeding device (4) for feeding a fibre bundle into a spinning preparation machine, comprising a main body (13) and at least one resilient lip (15) extending over the working width of the feed chute (5). According to the invention, a supporting strip (16) is arranged on the base body (13), said supporting strip extending along the working width, said supporting strip (16) being spaced apart from the elastic lip (15) by a distance which enables said distance to be eliminated by elastic deformation of the elastic lip (15). The invention also relates to a feeding device (4) for feeding a fiber bundle into a spinning preparation machine, comprising a feed roller (6) and a feed slot (5) according to the preceding description.

Description

Feed tank and feed device

Technical Field

The invention relates to a feed slot for feeding a fibre bundle to a feeding device in a spinning preparation machine, the feed slot comprising a base body and at least one resilient lip extending along a working width of the feed slot, and to a feeding device for feeding a fibre bundle into a spinning preparation machine, comprising a feed roller and a feed slot.

Background

A feed slot for a feeding device is known from EP 0926274 a 2. The feed slot has a resiliently deformable element formed with a gap, which element is fastened to the support element. Preferably, at least large foreign bodies do not penetrate into the elastic region. Such foreign matter has been caught from the elastic edge region upstream between the gap-forming element and the feed roller. The feed slot is then rotated as a unit about the axis against the bias of the spring. This fact is detected by a sensor, in which foreign matter is detected. The detection of foreign bodies can then cause the drive of the feed roller to stop and/or trigger an alarm. Therefore, the foreign matter does not reach the elastic region.

One disadvantage of the above-described feed trough is that the entire feed trough must be able to rotate about an axis. Since the gap formed by the gap-forming element must have a precise width in order to grip the fibrous material at the desired thickness, the feed slot must also be positioned precisely. In combination with a feed trough that is rotatable about an axis, this implies considerable engineering complexity.

Disclosure of Invention

It is therefore an object of the invention to provide a feed trough which allows the gap to have as precise a width as possible and at the same time requires little engineering complexity.

This object is achieved by a feed trough and a feed device having the features of the independent claims.

A feed chute for feeding a fiber bundle to a feed device in a spinning preparation machine is proposed. The spinning preparation machine may be a carding machine or a cleaner. The feed slot has a body and at least one resilient lip extending along a working width of the feed slot. The elastic lip forms a gap between itself and the feed roller of the feeding device.

According to the invention, a supporting strip is arranged on the base body, which supporting strip extends along the working width. The support strip is arranged at a distance from the resilient lip, said distance being such that the distance can be eliminated (close) by resilient deformation of the lip. If no brace bar is present, very large foreign objects can deform the resilient lip so much that the resilient lip deforms beyond the elastic range and then no longer returns to its previous shape. The support strip prevents this and thus makes it possible to achieve as long a service life as possible for the resilient lip. A movable element for preventing over-extension is therefore not necessary, which would make the engineering complexity low and simplify the mounting and replacement of the elastic lip.

It is advantageous that the resilient lip is made of steel, in particular chrome steel, since these materials have a good resilience and have a good resilient strength. Chromium steel is also corrosion resistant. The wall thickness of the resilient lip at its front end is preferably between 1.0 mm and 4.0 mm and particularly preferably between 1.5 mm and 2.0 mm, as this provides the necessary resilient strength.

Advantageously, the support bar is made of aluminum, since it provides high dimensional stability and has a low weight.

The resilient lip and the brace bar enclose a cavity, wherein the cavity enables movement of the resilient lip. To prevent contamination of the cavity, a seal is advantageously provided between the resilient lip and the support strip. The seal may be deformed to such an extent that it may be over-compressed during deformation of the resilient lip.

Advantageously, a spacer bar is provided between the body of the feed slot and the resilient lip. This enables the distance between the basic body and the elastic lip to be set, which is optimal for the grip of the fibre material. In order to adapt the distance to different fibre lengths, the spacer bars are preferably interchangeable and/or adjustable. For particularly large fiber lengths exceeding about 28 mm, the spacer bars can also be dispensed with completely.

It is also advantageous if a contact surface is associated with the support strip and the feed trough has an electrical and/or electronic connection for detecting contact between the resilient lip and the contact surface. Such contact between the elastic lip and the contact surface may occur when hard foreign matter is present in the fibre material, which hard foreign matter may deform the elastic lip to such an extent that it just contacts the contact surface. Thus, the contact indicates the presence of a hard foreign object in the fibrous material.

If such contact, and thus a hard foreign object, is detected, an audible and/or visual alarm may be triggered to alert the operator to the presence of the foreign object. Furthermore, the feed roller of the feeding device is preferably automatically stopped, so that foreign bodies do not travel further under the elastic lip and thus may cause damage to the feeding device. Furthermore, the feed roller can then be rotated back by a predetermined or predeterminable angle, whereby the foreign bodies are conveyed back and the removal of the foreign bodies is simplified by the operator.

Advantageously, the resilient lip is electrically insulated from the contact surface. The resilient lip and the contact surface may then be arranged as two ends of an open circuit with a voltage source and a current measuring device. If the elastic lip touches the contact surface, the circuit is closed and the flowing current is measured by the current measuring device.

Alternatively, a piezoelectric element may be provided, which is attached to the resilient lip and/or to the contact surface. Piezoelectric elements are also inexpensive, reliable, and largely maintenance-free. In case of contact between the elastic lip and the contact surface, then a pressure is applied to the piezoelectric element, which in turn generates a voltage which is detected by the sensor system.

In an advantageous development of the feed trough, the feed trough has at least two sections along its working width, an elastic lip being associated with each section. This simplifies the adjustment of the gap created by the resilient lip, since it is no longer necessary to set a constant gap width over the entire working width.

Advantageously, the piezoelectric element is associated with each segment, or the elastic lips associated with the individual segments are electrically insulated from each other and associated with separate electrical circuits. It is thus possible to achieve that each section detects foreign bodies individually. If this is indicated to the operator, the search for foreign bodies is simplified and therefore foreign bodies can be removed faster and production can be continued faster.

The feed slots are implemented according to the preceding description, it being possible for the cited features to be present individually or in any combination.

A feeding device for feeding a fiber strand into a spinning preparation machine, in particular a carding machine, carding machine or cleaner, is also proposed. The feeding device has a feeding roller and the above-described feeding groove. The feed trough therefore has, inter alia, a base body, at least one elastic lip extending along a working width of the feed trough, and a supporting strip extending along the working width. This reduces engineering complexity and facilitates adjustment of the resilient lip.

The above-described advantageous development of the feed slot also proves advantageous for a feed device having a feed slot.

Drawings

Additional advantages of the present invention are described in the exemplary embodiments described below. In the drawings:

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

fig. 2 shows a schematic side view of the feeding device;

fig. 3 shows a schematic side view of another feeding device;

fig. 4 shows a schematic side view of another feeding device;

fig. 5 shows a schematic side view of another feeding device; and

fig. 6 shows a schematic front view of the feed slot.

Detailed Description

Fig. 1 shows a schematic side view of a carding machine 1. The fibres are transported in the carding machine 1 from left to right. The fibre mat 2 is first conveyed over the feed plate 3 and then into the feed device 4. The feed device 4 has a feed slot 5 which cooperates with a feed roller 6. The fibre mat 2 gripped between the feed slot 5 and the feed roller 6 is then fed to the feed roller 7.

The nonwoven fibres proceed from the feed rollers 7 to the cylinder 8 and are further processed between the cylinder 8 and a cover plate 9, which is shown here very schematically. The nonwoven is then removed from the doffing roller 10 and conveyed to a compaction unit 11 where the nonwoven is compacted into a sliver 12.

Fig. 2 shows a schematic side view of a feeding device 4 according to the invention. The feeding device 4 may be part of the carding machine 1 as shown in fig. 1, but it may also be part of a carding machine or cleaner. The feeding device 4 has a feeding slot 5 and a feeding roller 6. In addition, a part of the feed roller 7 is shown.

The feed chute 5 has a main body 13 which is partially protected against wear by a protective plate 14. The elastic lip 15 is arranged so as to be able to grip the fibre between it and the feed roller 6. A support strip 16 is provided on the side of the resilient lip 15 remote from the feed roller 6. The resilient lip 15 can be resiliently deformed to the extent that it contacts the support strip 16. By means of the supporting strip 16, further deformations of the resilient lip 15, for example caused by hard foreign bodies in the fibre material, are excluded. The elastic lip 15 is thus not deformed in particular into the region in which the permanent deformation occurs. Thus, the return of the elastic lip 15 to its original shape and position is always ensured.

In the following description of alternative exemplary embodiments, the same reference numerals are used for features that are the same and/or at least comparable in their construction and/or mechanism of action to other embodiments. To the extent that a feature is not explained in detail again, its construction and/or mechanism of action corresponds to that of a feature already described above.

In the exemplary embodiment shown in fig. 3, a spacer bar 17 is provided between the main body 13 of the feed slot 5 and the resilient lip 15. The spacer bar 17 is embodied as an adjustable linkage 18, thus enabling the distance between the base body 13 and the elastic lip 15 to be easily adjusted. By varying the distance between the base body 13 and the resilient lip 15, the feed slot 5 can be optimized for different fibre lengths.

Furthermore, in the feed trough 5 of fig. 3, an easily deformable sealing 19 is provided between the resilient lip 15 and the support strip 16. The seal 19 closes the gap 20 between the resilient lip 15 and the brace bar 16 and thus protects the gap from contamination, in particular from flying lint.

Fig. 4 shows an additional feeding device 4. Although the spacer bar 17 is not adjustable in this exemplary embodiment, it is designed to be interchangeable, so that different distances between the base body 13 and the resilient lip 15 can be achieved with different spacer bars 17. This distance is adapted to the respective fibre length and in the case of very long fibres the spacer strips 17 can even be dispensed with completely.

Furthermore, the feeding device 4 of fig. 4 is embodied such that hard foreign bodies located in the fibre material can be detected by means of contact between the elastic lip 15 and the contact surface 21 of the supporting strip 16. To this end, an electrical insulator 22 insulates the resilient lip 15 from the support strip 16. In the electrical circuit, the resilient lip 15 is connected to the support bar 16 via a voltage source 23 and a current measuring device 24. Since the resilient lip 15 is electrically insulated from the support bar 16, the circuit is normally open and no current is measured by the current measuring device 24. However, if the resilient lip 15 is deformed by a hard foreign object to such an extent that it contacts the contact surface 21 of the support bar 16, for example, an electric circuit is closed and an electric current flows, which is measured by the current measuring device 24. The seal 19 is designed to be sufficiently flexible to enable it to be over-compressed and not compromise the contact.

In order to report contact of the elastic lip 15 with the contact surface 21 and thus the detection of a foreign object, the current measuring device 24 is connected to an acoustic and/or optical alarm 25, which warns the operator of the presence of a foreign object.

Advantageously, the current measuring device 24 is also connected to a control device 26 which, when a foreign body is detected, stops the feed roller 6 so that it does not penetrate any further, thereby preventing it from causing any major damage. It is particularly advantageous that the control device 26 also makes the feed roller rotate back far enough that foreign bodies under the elastic lip 15 come out and can be easily removed by the operator after the feed roller 6 has stopped.

In the exemplary embodiment shown in fig. 5, the contact between the elastic lip 15 and the contact surface 21 is detected by a piezoelectric element 27. In this case the piezoelectric element 27 is provided on the contact surface 21 of the support strip 16, but it may also be provided on the resilient lip 15. After contact between the elastic lip 15 and the contact surface 21, a pressure is applied to the piezoelectric element 27, resulting in a voltage between the two electrodes of the piezoelectric element 27. The voltage is measured and the contact is detected thereby.

In this exemplary embodiment, the feed slot 5 is shown without spacer bars, which are optional for particularly long fiber lengths.

Finally, fig. 6 shows a schematic front view of the feed chute 5. The resilient lip 15 is divided into four sections 15.1, 15.2, 15.3 and 15.4. As will be readily appreciated, different numbers of sections are also possible. The individual segments are shorter than the single elastic lip 15 and can therefore be adjusted better in their width.

The individual segments of the resilient lip 15 are also electrically insulated from each other. For this purpose, insulating layers 28 are applied in the regions where the individual segments adjoin one another, of which only one is provided with a reference numeral for the sake of clarity. The individual segments are connected to a voltage source via respective current measuring devices. If foreign bodies are present in the fibre mat, the section in which the foreign bodies are located can thus be identified. This is preferably reported to the operator so that the operator can immediately search for the foreign object in the correct section and then remove the foreign object.

The invention is not limited to the exemplary embodiments which have been shown and described. Modifications are also possible within the scope of the claims, combinations of features are also possible, and even if the features are shown and described in different exemplary embodiments.

List of reference numerals

1 carding machine

2 fiber mat

3 feeding plate

4 feeding device

5 feed slot

6 feed roller

7 feed roller

8 cylinder

9 cover plate

10 cotton stripping roller

11 compacting unit

12 sliver

13 base body

14 protective plate

15 resilient lip

15.1-15.4 sections of elastic lips

16 support strip

17 parting block strip

18 linkage mechanism

19 seal

20 clearance

21 contact surface

22 electrical insulation

23 Voltage Source

24 current measuring device

25 alarm

26 control device

27 piezoelectric element

28 insulating layer

Claims

1. A feed chute (5) for a feed device (4) for feeding a fibre bundle into a spinning preparation machine, comprising a base body (13) and at least one resilient lip (15) extending along a working width of the feed chute (5), characterized in that a support strip (16) is provided on the base body (13), the support strip extending along the working width, the support strip (16) being provided at a distance from the resilient lip (15), the distance being such that the distance can be eliminated by resilient deformation of the resilient lip (15).

2. Feed trough (5) according to claim 1, characterized in that the resilient lip (15) is made of steel, the wall thickness of the resilient lip (15) at its front end being between 1.0 mm and 4.0 mm.

3. Feed trough (5) according to claim 2, characterized in that the steel is chrome steel.

4. Feed trough (5) according to any one of the preceding claims, characterized in that the resilient lip (15) is made of steel, the wall thickness of the resilient lip (15) at its front end being between 1.5 mm and 2.0 mm.

5. Feed trough (5) according to claim 4, characterized in that the steel is chrome steel.

6. Feed trough (5) according to any one of claims 1 to 3, characterized in that the support strip (16) is made of aluminum.

7. The feed trough (5) according to any one of claims 1 to 3, characterized in that a seal (19) is provided between the resilient lip (15) and the support strip (16).

8. Feed trough (5) according to any one of claims 1-3, characterized in that a spacer strip (17) is provided between the base body (13) and the resilient lip (15), which spacer strip is interchangeable and/or adjustable.

9. The feed trough (5) according to any one of claims 1 to 3, characterized in that a contact surface (21) is associated with the support strip (16), and the feed trough (5) has an electrical and/or electronic connection for detecting contact between the resilient lip (15) and the contact surface (21).

10. A feed trough (5) according to any one of claims 1-3, characterized in that the resilient lip (15) is electrically insulated from the contact surface (21).

11. A feed trough (5) according to any one of claims 1-3, characterized in that a piezoelectric element (27) is provided, which is attached to the resilient lip (15) and/or to the contact surface (21).

12. A feed trough (5) according to any one of claims 1 to 3, characterized in that the feed trough (5) has at least two sections (15.1-15.4) along its working width, an elastic lip (15) being associated with each section (15.1-15.4).

13. A feed slot (5) according to claim 12, wherein a piezoelectric element (27) is associated with each section (15.1-15.4) and/or the elastic lips (15) associated with the individual sections (15.1-15.4) are electrically insulated from each other and associated with individual electrical circuits.

14. A feeding device for feeding a fiber bundle into a spinning preparation machine, the feeding device comprising a feed roller (6) and a feed slot (5) according to any of the preceding claims.