EP3431641B1 - Cleaning device - Google Patents

Description

The invention relates to a device and a method for cleaning fiber tufts fed to the device, with an inlet and at least one outlet for the fiber material, which is fed via the inlet of a single cleaning roller equipped with beating elements and having a longitudinal axis, and with a housing , wherein the housing is provided above the cleaning roller with guide elements forming transfer chambers for the spiral deflection of the conveying air flow around the cleaning roller and the inlet and the at least one outlet are attached to the housing.

Such cleaning machines are already known and are used to break up the fiber flocks fed to the cleaning machine in a conveying air stream and to remove impurities from them. The fiber tufts are dragged over bar grates under the influence of a rotating cleaning roller equipped with impact elements and are also knocked to a certain extent by the impact on the walls delimiting the transfer chambers, whereby impurities are loosened from the fiber tufts and separated by the grate. In the Überleitkammern are guide elements in the form of z. B. spirally mounted baffles are provided, via which the fiber flocks are conveyed from an inlet to an outlet of the cleaning device parallel to the axis of the longitudinal axis of the cleaning roller spirally. Such statements are, for example, from the publications of EP 0 379 726 A1 , the EP 0 381 860 A2 and the EP 0 477 966 A1 refer to.

Furthermore, designs of cleaning devices have been proposed, with two cleaning rollers arranged one behind the other being provided in order to carry out the cleaning of the fiber tufts. Such statements are e.g. B. from the publications of DE 697 04 462 T2 and the EP 2 557 208 B1 famous. With such designs, it is possible to achieve higher productivity of the cleaning device, especially since the separating surface for separating impurities can be increased. In DE'462, two parallel offset cleaning rollers are proposed, with the cleaning roller at a first cleaning stage having a first cleaning roller pre-cleaned fiber tufts are delivered spirally at a transfer point to a second cleaning stage. The fiber tufts fed into the second cleaning stage are further cleaned and fed to an outlet from which they are discharged to the following machines. The drive of this cleaning device is very expensive, especially since each cleaning roller of the cleaning stages is provided with a separate drive. In addition, this arrangement requires a lot of space in the spinning mill. There is also a risk of blockages in the area of the transfer point between the two cleaning stages.

The quoted EP 2 557 208 B1 has a cleaning device, with two cleaning rollers arranged parallel to one another also being provided. In contrast to the design of DE'462, the two cleaning rollers are arranged directly next to one another at a parallel distance. The fiber flock transport is also solved differently in the example of EP'208 than in the version of DE'462. The fiber tufts fed to the cleaning device (EP'208) are divided into two partial fiber tuft streams in the area of an inlet via appropriately provided elements (separating means) before the fiber tufts are fed in the middle of a first cleaning roller. The two streams of fiber tufts are then transferred from the center of the first cleaning roller under the action of guide plates fitted in an upper housing area in the opposite direction to a respective transfer opening to a subsequent cleaning stage with a further cleaning roller. i.e. A transfer opening to the subsequent cleaning stage is provided in the region of each of the two ends of the first cleaning roller.

In the second subsequent cleaning stage, the fiber tufts fed into the area of both ends of the second cleaning roller are conveyed spirally under the influence of appropriately arranged guide plates into the center of the cleaning roller and fed to a common outlet. In this embodiment, too, the drive is complex and therefore expensive due to the offset drive rollers of the two cleaning rollers, especially since the synchronization of the two cleaning rollers must also be taken into account. There is also a risk of blockages in the transfer area from the first to the second cleaning stage. Already when feeding the Fiber tufts in the inlet, where separating elements are provided for separating the fiber tufts, can lead to disruptions or undesired fiber accumulations, which in the worst case can lead to blockages. Furthermore, the embodiment shown also requires a considerable amount of space in the spinning mill.

CN 201 634 806 U and EP 2 295 620 A1 disclose further embodiments of cleaning devices.

The invention is now based on the object of proposing a device for cleaning fiber tufts which avoids the previously described disadvantages of known designs and enables trouble-free processing of fiber tufts and requires little space in the spinning mill while at the same time providing high productivity. This object is achieved by the device and method with the features according to the independent claims.

A device is proposed for cleaning fiber tufts fed in a conveying air stream, with an inlet and an outlet, with a single cleaning roller fitted with impact elements and having a longitudinal axis, and with a grate arranged below the cleaning roller and a housing, with the housing above the cleaning roller is provided with guide elements forming transfer chambers for the spiral deflection of the conveying air flow around the cleaning roller. Viewed in the direction of the longitudinal axis, the inlet is arranged centrally to the cleaning roller and a first outlet opening is provided in the area of a first end of the cleaning roller and a second outlet opening in the housing in the area of a second end of the cleaning roller. The first outlet opening and the second outlet opening are combined with a transport line to form an outlet. The guide elements are designed or arranged in such a way that the conveying air flow guiding the fiber tufts can be divided into a first and second subset and the subsets are guided through the transfer chambers in opposite directions to one another in the direction of the longitudinal axis to the respective outlet.

With the proposed solution, the drive is simplified on the one hand, especially since only one axis of the single cleaning roller has to be driven, and on the other hand, the direct feeding of the entire fiber tuft mass to the cleaning drum or to the grate arranged below, a possible risk of clogging in this area is excluded. The separation of the conveying air flow and thus also the fiber tufts into two subsets only takes place after the supplied fiber tufts have passed the grate for the first time. The fiber tufts are then divided into two subsets under the action of appropriately arranged guide elements and the impact elements provided on the cleaning drum. These subsets are then fed in the opposite direction spirally around the cleaning roller to a respective outlet opening. The two outlet openings are brought together to form one outlet via a transport line. Thus, no transfer point to a subsequent second cleaning stage is necessary.

The cleaning roller advantageously has a length of 2.5 m to 5 m, particularly preferably a length of 3 m, in the direction of the longitudinal axis. This results in high productivity of the cleaning device with a small footprint. An enlargement of the separation surface can be achieved without the space required in the spinning mill increasing to an undesired extent.

The guide elements preferably consist of a plurality of guide plates which are attached at a distance from one another and run at an angle of 5 to 20 degrees to the longitudinal axis. The angle of the vanes for movement of the first subset to the first end of the cleaning roller is opposite to the angle of the vanes for movement of the second subset to the second end of the cleaning roller. An already known design of guide elements in the form of guide plates is thus proposed, which has proven itself.

In order that the supplied fiber material can be separated into a first and a second subset in a targeted and timely manner after leaving the grate, it is further proposed that - viewed in the direction of rotation of the cleaning roller - the guide plates in the area of the inlet directly adjoin the end of the grate . This means that the conveying air flow and thus also the fiber tufts are separated immediately after leaving the grate.

In order to enable the fiber material to be fed in and removed properly and without problems, it is further proposed that the central inlet and the respective outlet opening at the ends of the cleaning roller be arranged tangentially to the surface of the cleaning roller.

Furthermore, it is proposed that the cleaning roller has a diameter of 500 mm to 1000 mm, preferably a diameter of 650 mm. With this design, too, productivity can be increased with little space required.

The grate used for the separation can be formed into several, preferably two, sections over the length of the cleaning roller. The grate, which is made up of a large number of grate bars, can be varied by using different types of grate bars. Advantageously, the grate bars are supported several times along the longitudinal axis. It is also conceivable that the position of the grate bars relative to the cleaning roller can be adjusted by a corresponding device. It is known to connect the grate bars to one another and to provide an adjusting device at one end of the cleaning roller. The adjusting device can be manual or powered. The distance between the grate bars and their angular position relative to the surface of the cleaning drum are changed by rotating the grate bars around their own axis. A device is also conceivable which enables delivery in the radial direction to the cleaning roller.

In order to achieve a further improvement, the grate bars are divided into two or more sectors. The fiber tufts are guided one after the other over the different sectors of the grate bars as they progress over the grate. For example, the first half of the grate bars are combined in a first sector along the surface of the cleaning roller and the second half of the grate bars are combined in a second sector along the surface of the cleaning roller. The fiber tufts guided over the grate by the cleaning roller are thus transported one after the other over the first and second sectors of the grate. This results in the possibility of setting the grate bars of the first sector differently from the grate bars of the second sector. The differences can be, for example, in the angular position, the distance between the grate bars among themselves or at a distance between the grate bars and the surface of the cleaning roller.

It is particularly advantageous if the two sectors are coupled again after the grate bars have been preset. This makes it possible to adjust the grate bars of both sectors in the same way when the grate is adjusted, regardless of their presetting. Other combinations of grate divisions, coupling of movements of grate bars combined into groups, segments or sectors are also conceivable. A similar distribution can also take place in the direction of the longitudinal axis, whereby, for example, the fiber material is transported via the spiral path from the center to the end of the cleaning roller over differently adjusted grate elements.

Preferably, it is further proposed that the cleaning roller is provided with beating elements in the form of hook-shaped carriers for transporting the fiber tufts. This ensures the smooth transport of the fiber tufts and an optimal cleaning effect in the cleaning device.

Furthermore, a method for cleaning fiber tufts transported in a conveying air stream is proposed, with a device with an inlet and an outlet, with a single cleaning roller having a longitudinal axis and with a grate arranged below the cleaning roller and with a housing, which is equipped with several guide elements for the spiral-shaped Deflection of the conveying air flow is provided. The flow of conveying air is fed centrally between the two ends of the cleaning roller through a central inlet to the cleaning roller and moved over the grate. Subsequently, the conveying air flow guiding the fiber tufts is divided by the cleaning roller in cooperation with the guide elements into two subsets, which are conveyed in opposite directions to one another, seen in the direction of the longitudinal axis of the cleaning roller, spirally around the cleaning roller to the respective end of the cleaning roller. The conveying air streams of the respective subset are provided by a cleaning roller at the respective end Outlet opening released and combined with a transport line to an outlet.

The proposed method also ensures simple and trouble-free processing of fiber tufts and enables high productivity with little space requirement.

Further advantages of the invention are shown and described in more detail in the following figures.

Figur 1

eine schematische Darstellung einer bekannten Reinigungsmaschine

Figur 2

eine schematische Darstellung einer Seitenansicht in Richtung X nach Figur 1 mit teilweiser Schnittdarstellung

Figur 3

eine schematische Darstellung einer Ausführungsform einer Reinigungsmaschine

Figur 4

eine schematische Darstellung einer Seitenansicht in Richtung Y nach Figur 3 mit teilweiser Schnittdarstellung

Show it

figure 1

a schematic representation of a known cleaning machine

figure 2

a schematic representation of a side view in the X direction figure 1 with partial sectional view

figure 3

a schematic representation of an embodiment of a cleaning machine

figure 4

a schematic representation of a side view in the Y direction figure 3 with partial sectional view

Fig.1 and Fig.2 show a schematic representation of a known cleaning device with a cleaning roller 1, which is rotatably mounted in a housing 2 via a shaft about a longitudinal axis 5. As seen from the side view in direction X from the Fig.2 can be seen, the shaft is driven by a drive 10 shown schematically. On the peripheral surface of the cleaning roller 1, a plurality of impact elements 11 are attached. The cleaning roller 1 is moved in a direction of rotation 23 by the drive 10 . Below the cleaning roller 1, a grate 6 is mounted in the housing 2. The grate 6 has a large number of grate bars 7 arranged next to one another at a distance from one another and can—seen in the direction of rotation 23—also be designed in several parts.

An inlet 3 is provided on one side of the housing 2 . On the opposite side of the housing 2, an outlet 4 is provided. Above the cleaning roller 1 and between the inlet 3 and the outlet 4 spirally (or helically) attached guide elements in the form of guide plates 9 are provided. The guide plates 9 are attached at a constant distance from one another and form so-called transfer chambers 8 between them. The spiral arrangement of the guide elements (or their angle of incidence α to the longitudinal axis 5) is selected in such a way that, via the inlet 3 in a conveying air flow 13 supplied fiber flocks are conveyed spirally in the transport direction 12 to the outlet 4 and are guided several times over the grate 6.

During operation, fiber tufts to be cleaned and dissolved are fed to the cleaning device in a conveying air flow 13 through the inlet 3 . The conveying air flow 13 with the fiber tufts then flows around the underside of the cleaning roller 1 several times and in between successively through the respective transfer chambers 8 above the upper side of the cleaning roller 1 to finally leave the housing 2 via the outlet 4 . While running around the underside of the cleaning roller 1, the fiber tufts are processed by the beating elements 11 and the grate 6 and progressively broken up, the impurities present in the fiber tufts being loosened and separated by the grate 6 under the action of centrifugal force. The impurities separated in this way are removed via devices not shown in detail, for example suction lines.

In the figure 3 and figure 4 an embodiment is shown in a schematic representation, the representation of the figure 4 a side view Y after figure 3 displays. In the cleaning device shown, a grate 6 with grate bars 7 is arranged below a cleaning roller 1 provided with impact elements 11 . The cleaning roller 1 is mounted in the housing 2 so that it can rotate about a longitudinal axis 5 . The cleaning roller 1 is driven in a direction of rotation 23 by the drive 10 shown schematically. An inlet 3 aligned tangentially to the cleaning roller 1 is attached centrally to the cleaning roller 1 . The inlet 3 opens into the housing 2 on the opposite side of the grate 6 and above the cleaning roller 1 . Here are the two outlet openings 15 and 17 in relation to the longitudinal axis 5 on the same side as the cleaning roller 1, while the inlet 3 - viewed in the direction of rotation 23 - is offset by approximately 180° at a parallel distance b on the opposite side to the outlet openings 15 and 17.

Between the inlet 3 - viewed in the direction of the longitudinal axis 5 - and the first outlet opening 15 1 guide elements in the form of guide plates 9 are provided above the cleaning roller. The baffles 9 are attached in a spiral and run at an angle α to the longitudinal axis 5. The baffles 9 run at a constant distance from one another and form so-called transfer chambers 8. Due to the correspondingly designed spiral shape of the baffles, a first subset 19 of the inlet 3 is supplied Fiber tufts conveyed in the transport direction 21 to the first outlet opening 15 .

Furthermore, guide elements in the form of guide plates 9 are also provided between the inlet 3--seen in the direction of the longitudinal axis 5--and the second outlet opening 17 above the cleaning roller 1. The baffles 9 are arranged as a mirror image of the arrangement of the baffles 9 between the inlet 3 and the first end 14 of the cleaning roller 1 . The second subset 20 of the fiber tufts fed to the inlet 3 is conveyed in the transport direction 22 to the second outlet opening 17 by the correspondingly designed spiral course of the transfer chambers 8 formed by the baffles.

As described below, the conveying flow 13 and thus the fiber tufts are divided into two subsets 19 and 20 only after they have passed the grate 6 for the first time.

Seen in the direction of rotation 23 of the cleaning roller 1, the ends 25 of the guide plates 9, which are attached directly in the area of the inlet 3, are attached at a small distance a to an end 24 of the grate 6 in order to divide the conveying air flow 13 into two subsets 19 and 20 to be made immediately after leaving the grate 6. How out figure 4 can be seen, the ends 25 of the guide plates 9 directly against each other and thus form a separation point for the two subsets 19 and 20 of the conveying air flow 13, as indicated by arrows. The ends of the other guide plates 9 (seen in the direction of rotation 23), which—seen in the direction of the longitudinal axis 5—are attached at a distance from the inlet 3, can have a greater distance a from the end of the grate 24, as shown schematically in FIG figure 1 will be shown. Depending on the design of the guide plates 9, it is also conceivable to also arrange the ends 25 of the guide plates 9 attached directly in the area of the inlet 3 at a greater distance a from the end 24 of the grate 6 (seen in the direction of rotation 23), provided that there is a problem-free division of the conveying air flow is ensured before it crosses the grate 6 for the second time.

The partial quantities 19 and 20 discharged from the respective outlet openings 15 and 17 are combined to form an outlet 4 via a transport line 18 shown schematically. The conveying air stream 13 leaving the outlet 4 is transported to a downstream machine for further processing. The arrangement of the transport line 18 can be selected arbitrarily between the two outlet openings 15 and 17.

The cleaning device proposed according to the invention makes it possible to increase the productivity of this device by using a cleaning roller 1 with a length c of 3 m and more, without significantly increasing the space requirement in the spinning mill. In addition, by increasing the diameter d of the cleaning roller to 650 mm and more, the available processing area (grate area) can be increased, which also increases productivity without requiring a large amount of space. Due to the proposed design, it is not necessary to already provide separating elements for dividing the fiber tufts into two halves in the area of the inlet.

Legend

1

cleaning roller

2

housing

3

enema

4

outlet

5

longitudinal axis

6

rust

7

rust bar

8th

transition chamber

9

baffle

10

drive

11

striking elements

12

transport direction

13

conveying air flow

14

First end of the cleaning roller

15

First outlet opening

16

Second end of the cleaning roller

17

Second outlet opening

18

transport line

19.20

subsets

21, 22

transport direction

23

direction of rotation

24

end of the rust

25

end of the baffles

a

angle

a

Baffle distance

b

Distance inlet to outlet

c

Length of cleaning roller

i.e

Diameter cleaning roller

Claims (8)

1. A device for cleaning fiber flocks supplied in a conveying air stream (13), comprising an inlet (3) and an outlet (4), a single cleaning roller (1) which has a longitudinal axis (5) and is equipped with beater elements (12), and comprising a grate (6) arranged beneath the cleaning roller (1) and comprising a housing (2), wherein the housing (2) is provided above the cleaning roller (1) with guide elements (9) forming the transition chambers (8) for deflection of the conveying air stream (13) in a spiral arrangement around the cleaning roller (1), wherein as seen in the direction of the longitudinal axis (5), the inlet (3) is arranged centrally relative to the cleaning roller (1), characterized in that a first outlet opening (15) in the area of a first end (14) of the cleaning roller (1) and a second outlet opening (17) in the area of a second end (16) of the cleaning roller (1) are provided in the housing (2), wherein the first outlet opening (15) and the second outlet opening (17) are combined with a transport line (18) to form an outlet (4), and that the guide elements (9) are designed or arranged in such a way that the conveying air stream (13) guiding the fiber flocks can be divided into a first and a second partial amount (19, 20), and the partial amounts (19, 20) are guided to the respective outlets (15, 17) in opposite directions from one another (21, 22) through the transition chambers (8) in the direction of the longitudinal axis (5).
2. The device according to claim 1, characterized in that the cleaning roller (1) has a length (c) of 2.5 meters to 5 meters, preferably a length (c) of 3 meters in the direction of the longitudinal axis (5).
3. The device according to claim 1 or 2, characterized in that the guide elements (9) consist of a plurality of baffle plates mounted at a distance from one another and running at an angle (α) of 5 to 20 angle degrees to the longitudinal axis (5), wherein the angle (α) of the baffle plates for the movement of the first partial amount (19) to the first end (14) of the cleaning roller (1) is arranged opposite the angle (α) of the baffle plates for the movement of the second partial amount (20) to the second end (16) of the cleaning roller (1).
4. The device according to any one of the preceding claims, characterized in that the guide elements (9) in the area of the inlet (3) are connected directly to the end (24) of the grate (6) - as seen in a direction of rotation (23) of the cleaning roller (1).
5. The device according to any one of the preceding claims, characterized in that the inlet (3) and the outlet openings (15, 17) are arranged tangentially to the surface of the cleaning roller (1).
6. The device according to any one of the preceding claims, characterized in that the cleaning roller (1) has a diameter (d) of 500 mm to 1000 mm, preferably a diameter (d) of 650 mm.
7. The device according to any one of the preceding claims, characterized in that the cleaning roller (1) is equipped with beater elements (11) in the form of hook-shaped entraining elements for the transport of the fiber flocks.
8. A method for cleaning fiber flocks transported in a conveying air stream (13) with a device comprising an inlet (3) and an outlet (4), with a single cleaning roller (1) that has a longitudinal axis (5) and with a grate (6) arranged beneath the cleaning roller (1), and comprising a housing (2), which is provided with a plurality of guide elements (9) for deflecting the conveying air stream (13) in a spiral arrangement, characterized in that the conveying air stream (13) is guided centrally to the cleaning roller (1) between the two ends (14, 16) of the cleaning roller (1) through a central inlet (3) and conveyed over the grate (6), and then the conveying air stream (13) guiding the fiber flocks is divided into two partial amounts (19, 20) by the cleaning roller (1) in cooperation with the guide elements (9), these partial amounts being conveyed in a spiral path around the cleaning roller (1) to the respective roller end (14, 16) of the cleaning roller (1) in opposite directions (21, 22) from one another, as seen in the direction of the longitudinal axis (5) of the cleaning roller (1), and the conveying air streams of the respective partial amount (19, 20) are discharged through an outlet opening (15, 17) provided on the respective end (14, 16) of the cleaning roller (1) in the housing (2) and combined with a transport line (18) to form an outlet (4).

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