EP3415667A1 - Device and method for cleaning fibres - Google Patents

Abstract

The invention relates to a device and a method for cleaning fiber material (2) with a cleaner (1) having a cleaning roller (3) and a cleaner housing (23) and a condenser (4) arranged above the cleaner (1) and one pneumatic feeding of the fiber material (2) with transport air (9). The condenser (4) has an air-permeable, in a screen drum housing (14) rotatably mounted screen drum (5) and, in a feed roller housing (18) rotatably mounted feed roller (6), each having a longitudinal axis (7, 8). The feed roller (6) is arranged between the screen drum (5) and the cleaning roller (3) and the fiber material (2) is guided with the transport air (9) directed onto an outer surface (10) of the screen drum (5). There is a separation of fibrous material (2) and transport air (9) through the sieve drum (5), wherein an interior (26) of the sieve drum (5) is connected to a vacuum source (30). The feed roller (6) has at its periphery radially projecting in the direction of the longitudinal axis (8) arranged ribs (11) with an outer end (15), which form an enveloping circle (13). The enveloping circle (13) has a spacing (a) from the outer surface (10) of the sieve drum (5). Seen in the circumferential direction of the screen drum (5), the screen drum housing (14) is connected to the feed roller housing (18) in the region of a passage opening (29) between the screen drum (5) and the feed roller (6). In the region of the passage opening (29), a shielding element (19) is provided inside the screen drum (5), wherein the fiber material (2) guided to the screen drum (5) in the region in the region of the shielding element (19) by the action of a centrifugal force on the following arranged feed roller (6) can be transferred.

Description

The invention relates to a device or a method for the purification of fiber material with a cleaner having a cleaning roller and a cleaner housing and a arranged above the cleaner Kondenser.

From the prior art, for. B. from the published CH 695 154 A5 , Devices are known which are provided for opening and cleaning of fiber material. In this case, the fiber material (eg in the form of fiber flakes) is fed via a transport channel under the action of a generated transport air to a condenser, which is provided with a rotatably mounted screen drum. Within the screen drum, a negative pressure is applied, which is generated by a vacuum source. As a result, the fiber material supplied to the screen drum is sucked onto the surface of the screen drum and deposited thereon. In this process, there is a separation between the fiber and the transport air. The now formed on the surface (outer circumference) of the screen drum fiber mat is transferred by the rotational movement of the screen drum to a rotating feed roller (fan roller), which is provided with outwardly projecting scrapers, or with subjects on which the located on the screen drum fiber mat (Nonwoven fabric) is removed. The removed fiber material is delivered by the rotational movement of the feed roller to a subsequent channel, which has the shape of a funnel and opens into an inlet, or inlet nozzle of a subsequent cleaner. The cleaner is provided with a cleaning roller, via which the fiber material is transported spirally in the direction of the longitudinal axis of the cleaning roller to a discharge opening. The spiral transport of the fiber material is effected by appropriately mounted in the cleaner guide elements. During the transport of the fiber material through the cleaner this happens several times below the cleaning roller mounted grate, over which by the influence of, mounted on the cleaning roller pins and under the action of centrifugal impurities from the fiber material are deposited.

A disadvantage of the disclosed embodiment is the occurrence of high wear of feed roller and drum, since the complete adoption of the on the drum held fiber material through the feed roller the scraper of the feed roller cover the surface of the screen drum. As a result of wear, the Abtreifung worse the fiber material is no longer completely removed from the screen drum.

The invention is based on the object to propose an apparatus and a method for the purification of fiber material, which allows a continuous uniform and wear-free transfer of the fiber material from the screen drum to the subsequent feed roller.

The object is achieved by a device and a method having the features of the independent claims.

To solve the problem, a novel device and an associated method for cleaning fiber material with a cleaning roller and a cleaner housing having cleaner and a cleaner disposed above the condenser and a pneumatic supply of the fiber material with transport air to the condenser proposed. The condenser has an air-permeable, in a Siebtrommelgehäuse rotatably mounted drum and a rotatably mounted in a Speisewalzengehäuse feed roller, each having a longitudinal axis, wherein the feed roller between the drum and the cleaning roller is arranged and the fiber with the transport air on an outer surface of the drum guided guided and a separation of fiber material and transport air through the screen drum is provided, wherein an interior of the screen drum is connected to a vacuum source. The feed roller has on its circumference in the direction of the longitudinal axis arranged radially projecting ribs with an outer end, which form an enveloping circle. The enveloping circle is at a distance from the outer surface of the screening drum. The screen drum housing is connected to the feed roller housing in the region of a passage opening between the screen drum and the feed roller. In the region of the passage opening, a shielding element is provided within the screen drum, wherein the fiber material guided on the screen drum in the region of the shielding element can be transferred to the subsequently arranged feed roller by the action of a centrifugal force.

The vacuum source creates a suction effect in the interior of the screen drum which holds the supplied fiber material on the outer surface of the screen drum. If the fiber material now reaches the area of the shielding element mounted in the interior, the suction effect on the outer surface of the screen drum caused by the vacuum source is released and the fiber material reaches the feed roller arranged below the screen drum.

Advantageously, a speed of the screen drum 800 to 1800, more preferably 1200 revolutions per minute and a speed of the feed roller 300 to 500, more preferably 350 revolutions per minute.

This makes it possible that as a result of the high rotational speed or the high peripheral speed of the screen drum, the fiber material is thrown away by the centrifugal force in the region of missing by the shielding suction from the screen drum. Thus, a flawless and quick transfer of the fiber material is ensured without touching the ribs of the feed roller with the outer surface of the drum to the feed roller. An actual stripping is no longer necessary.

Advantageously, the distance between the outer surface of the screen drum and the enveloping circle of the feed roller is more than 1.0 mm, preferably 1.0 to 25 mm. This distance avoids clogging or entrapment of fiber in the transition area. Since the feed roller additionally acts as a blocking member in its housing and in relation to the screen drum in order to prevent portions of the transport air from reaching the subsequent cleaner, a further enlargement of the distance is not advantageous.

Furthermore, it is proposed that the outer diameter of the screening drum is 2 to 3 times the enveloping circle diameter of the feed roller. Thus, the device can be optimized in terms of the centrifugal force required for the detachment of the fibers from the screen drum and the necessary rotational speed of the feed roller. For a diameter of the screening drum, a range of 400 to 700 mm and for a diameter of the enveloping circle of the feed roller a range of 100 to 250 mm has proven to be advantageous.

Advantageously, a direction of rotation of the screen drum is directed opposite to a direction of rotation of the feed roller. As a result, the surface of the feed roller moves in the same direction as the surface of the screen drum, and the ejected from the screen drum fibrous material. Preferably, a peripheral speed of the feed roller and the screen drum is the same for improved adoption of the output from the screen drum fiber material through the feed roller.

It is further proposed that an immediate delivery of the fiber material via the feed roller to an input port of the subsequent cleaner without interposition of an additional channel or buffer. This is made possible by the uniform delivery of the fiber material from the screen drum. Advantageously, the feed roller housing is connected in the region of an inlet opening of the cleaner with the cleaner housing. For the direct takeover of the downwardly discharged from the feed roller fiber material by the subsequent cleaning roller of the cleaner, it is advantageous if a distance between the outer circle of the feed roller and a surface of the cleaning roller is 30 mm to 250 mm.

By further suggesting that the axes of the screen drum and the feed roller run parallel to the axis of the cleaning roller, a continuous tangential feeding of the fiber flow to the cleaning roller is ensured.

In order to avoid a disturbance of the transfer and transfer of the fiber flow it is further proposed that the length of the feed roller corresponds to the length of the screen drum.

• Figur 1 eine schematische Darstellung einer Vorrichtung nach dem Stand der Technik;
• Figur 2 eine schematische Darstellung einer Ausführungsform nach der Erfindung und
• Figur 3 eine vergrösserte schematische Darstellung einer Seitenansicht X nach Figur 2.

Further advantages of the invention are shown in more detail in the following drawings and their description. Show it:

• FIG. 1 a schematic representation of a device according to the prior art;
• FIG. 2 a schematic representation of an embodiment of the invention and
• FIG. 3 an enlarged schematic representation of a side view X after FIG. 2 ,

FIG. 1 shows a schematic representation of an embodiment of a cleaning device according to the prior art, which comprises a condenser 4 and arranged below the condenser 4 cleaner 1 with a rotatably mounted cleaning roller 3. The condenser 4 has a screen drum 5 which is mounted rotatably about a longitudinal axis 7 in a screen drum housing 14 and which is charged with fiber material 2 via a channel 17, and a feed roller 6 (also called fan roller) mounted rotatably about a longitudinal axis 8 in a feed roller housing 18 ,

By means of transport air 9, the fiber material 2 of the screen drum 5 is supplied. In the interior 26 of the screen drum 5, a negative pressure is applied by a vacuum source 30. As a result, the supplied fiber material 2 is sucked onto the surface 10 of the screen drum 5 and separated by the air-permeable surface 10 of the screen drum 5 of the transport air 9, which passes through the openings of the screen drum 5 and is discharged via the vacuum source 30. In this process, a fibrous nonwoven forms on the circumference 10 of the screen drum 5, which is transferred by the direction of rotation of the screen drum 5, indicated by an arrow, to a passage opening 29 in the screen drum housing 14.

The feed roller 6 is arranged below the screen drum 5 and the feed roller housing 18 directly adjoins the screen drum housing 14. The direction of rotation of the feed roller 6 corresponds to the direction of rotation of the screen drum 5. As a result, the surface of the feed roller 6 and the surface 10 of the screen drum 5 move in the opposite direction.

The formed on the surface 10 of the screen drum 5 Fasergutvlies is stripped by the rotational movement of the feed roller 6 and attached to the circumference of the feed roller 6, outwardly projecting ribs 11 and discharged by gravity down into a conveyor channel 20. The delivery channel 20 is funnel-shaped (please refer Fig.2 of the CH 695 154 A5 ), so that the output of the feed roller 6 Fasergutmasse is summarized on the cross section of a subsequent inlet opening 22 of the cleaner 1. The fiber material is fed tangentially to the cleaning roller 3 via this inlet opening 22. The cleaning roller 3 is provided on its outer circumference with impact pins 24, via which the supplied fiber material in cooperation with arranged above the cleaning roller 3 baffles 28 is helically transferred in the direction of the longitudinal axis 12 to a spout 27. Subsequently, the cleaned fiber material is transferred to further process stages. In this helical transport within the cleaner 1, the fiber material is passed several times to a mounted below the cleaning roller 3 grate 25, while impurities are separated from the fiber.

In FIG. 2 Shown schematically is an embodiment of the device according to the invention, wherein like reference numerals are used for the parts corresponding to the parts of the known embodiment FIG. 1 correspond.

Also in the embodiment of the FIG. 2 (According to the invention), a cleaner 1 with a about a longitudinal axis 12 in a cleaner housing 23 rotatably mounted cleaning roller 3 and a condenser 4 with a sieve drum 5 and a feed roller 6 is provided. The screen drum 5 is rotatably mounted in a screen drum housing 14 about a longitudinal axis 7. The feed roller 6 is rotatably mounted in a feed roller housing 18 about a longitudinal axis 8. The condenser 4 and the screen drum 5 is fed via a channel 17 with fiber material 2 by means of transport air 9. The screen drum 5 is connected to its interior 26 with a vacuum source 30. As a result, the supplied fiber material 2 is sucked onto the surface 10 of the screen drum 5 and separated by the air-permeable surface 10 of the screen drum 5 of the transport air 9, which passes through the openings of the screen drum 5 and is discharged via the vacuum source 30. In this process, a fibrous nonwoven forms on the circumference 10 of the screen drum 5, which is transferred by the direction of rotation of the screen drum 5, indicated by an arrow, to a passage opening 29 in the screen drum housing 14. In contrast to the device according to the FIG. 1 , is due to the, located on the screen drum fiber nonwoven by, due to a high Speed of 800 to 1800 rev / min of the screen drum 5 resulting centrifugal force from the surface 10 in the direction of an inner wall of the screen drum housing 14 thrown. In the region of a passage opening 29 in the screen drum housing 14, a shielding element 19 is provided in the interior 26 of the screen drum 5. The passage opening 29 is provided between the screen drum housing 14 and the subsequent feed roller housing 18. At the location of this shielding element 19, the effect of the negative pressure on the surface 10 of the screening drum 5 and thus on the fiber material web located thereon is interrupted. This has the consequence that at the location of the passage opening 29 by the centrifugal forces, the fiber material from the surface 10 of the perforated drum 5 is thrown through the passage opening 29 in the feed roller 6. The feed opening 29 forms the transfer region of the screen drum 5 to the subsequent feed roller 6. The feed roller 6 is provided on the circumference with outwardly projecting ribs 11, the outer ends 15 form an enveloping circle 13.

By the opposite directions of rotation of the screen drum 5 and the feed roller 6 results in a rectified movement of the surfaces and the fiber is fed from the screen drum 5 between the individual ribs 11 of the feed roller 6 for further transport. About the rotational movement of the feed roller 6, the accumulated between the ribs 11 of the feed roller 6 fiber material is transported down and delivered to an inlet opening 22 of the subsequent cleaner 1. By arranging the feed roller 6 at a distance b of 30 to 250 mm from the surface 16 of the cleaning roller 3, a direct and continuous transfer of the fiber material without caching is possible.

A stripping of the nonwoven fabric from the surface 10 of the screen drum 5 is not necessary, which is why between the enveloping circle 13 of the feed roller 6 and the surface 10 of the perforated drum 5, a distance a is provided which is greater than 1 mm and can be up to 25 mm. As a result, material accumulations or blockages between the ribs 11 and the surface 10 of the screening drum 5 are avoided.

Via the inlet opening 22, the fiber material is fed tangentially to the cleaning roller 3. The cleaning roller 3 is provided on its outer periphery with impact pins 24, via which the supplied fiber material in cooperation with arranged above the cleaning roller 3 baffles 28 is helically transferred in the direction of the longitudinal axis 12 to an outlet 27. Subsequently, the cleaned fiber material is transferred to further process stages. In this helical transport within the cleaner 1, the fiber material is passed several times to a mounted below the cleaning roller 3 grate 25, while impurities are separated from the fiber.

FIG. 3 shows in an enlarged schematic representation of a side view X according to the FIG. 2 The condenser 4 has a sieve drum 5 with a sieve drum housing 14 and a feed roller 6 with a feed roller housing 18. The screen drum housing 14 is connected to the feed roller housing 18 in the region of a passage opening 29. The longitudinal axis 7 of the screening drum 5, and the longitudinal axis 8 of the feed roller 6 are arranged parallel to the longitudinal axis 12 of the cleaning roller 3. As a result, the fiber material discharged downwardly from the feed roller 6 is fed directly and without change in the cross section of the inlet opening 22 of the cleaner 1, whereby it is discharged directly onto the circumference of a cleaning roller 3 provided with impact pins 24. Subsequently, the fiber material is conveyed helically in the direction of the longitudinal axis 22 of the cleaning roller 3 to an outlet 27. This promotion is also supported by above the cleaning roller 3 mounted guide elements 28. The deposition of impurities from the fiber material via a mounted below the cleaning roller 3 grate 25, which is repeatedly traversed by the fiber material during transport of the fiber material to the outlet 27.

How out Figure 3 can be seen, the screen drum 5 has a length d and the feed roller 6 a length c, which correspond approximately to a width of the inlet opening 22 of the cleaner 1. Thus, it is not necessary to merge the discharged from the screen drum 5 fiber material. That is, the fiber material discharged from the screen drum 5 can be fed directly to the input opening 22 via the feed roller 6.

The drive of the screen drum 5, the feed roller 6 and the cleaning roller 3 is effected by a drive 21. However, it is also possible to provide individual drives for these elements.

Legend

1

cleanser

2

fiber material

3

cleaning roller

4

condenser

5

screen drum

6

feed roll

7

Longitudinal axis sieve drum

8th

Longitudinal axis feed roll

9

transport air

10

Outer surface sieve drum

11

ribs

12

Longitudinal axis cleaning roller

13

Enveloping circle feed roll

14

Screen drum housing

15

Outer end of the ribs

16

Surface cleaning roller

17

channel

18

Feed roll housing

19

shielding

20

delivery channel

21

drive

22

Entrance opening cleaner

23

cleaner case

24

knock pins

25

rust

26

Interior sieve drum

27

Spout cleaner

28

baffle

29

Through opening

30

Vacuum source

a

Distance enveloping circle feed roll to surface sieve drum

b

Distance enveloping circle feed roll to surface cleaning roller

c

Length of feed roller

d

Length of sieve drum

Claims (12)

Device for cleaning fiber material (2) with a cleaner (1) having a cleaning roller (3) and a cleaner housing (23) and a condenser (4) arranged above the cleaner (1) and a pneumatic feed of the fiber material (2) with transport air (9), wherein the condenser (4) has an air-permeable, in a screen drum housing (14) rotatably mounted screen drum (5) and, in a feed roller housing (18) rotatably mounted feed roller (6), each having a longitudinal axis (7, 8) , wherein the feed roller (6) between the screen drum (5) and the cleaning roller (3) is arranged and the fiber material (2) with the transport air (9) on an outer surface (10) of the screen drum (5) directed directed and a separation of fibrous material (2) and transport air (9) through the sieve drum (5) is provided, wherein an interior space (26) of the sieve drum (5) to a vacuum source (30) is connected, characterized in that the feed roller (6) at its Girth in Ric having radially outer ribs (11) arranged on the longitudinal axis (8) and having an outer end (15) which forms an enveloping circle (13) at a distance (a) from the outer surface (10) of the sieve drum (5); that seen in the circumferential direction of the screen drum (5), the screen drum housing (14) with the feed roller housing (18) in the region of a passage opening (29) between the screen drum (5) and the feed roller (6) is connected, and that in the region of the passage opening ( 29) within the screen drum (5) a shielding element (19) is provided, wherein the to the screen drum (5) guided fiber material (2) in the region of the shielding element (19) by the action of centrifugal force to the subsequently arranged feed roller (6) can be transferred , Apparatus according to claim 1, characterized in that a speed of the screen drum (5) is 800 to 1800 revolutions per minute and a speed of the feed roller (6) 300 to 500 revolutions per minute. Apparatus according to claim 2, characterized in that the speed of the screening drum (5) is preferably 1200 revolutions per minute. Apparatus according to claim 2 or 3, characterized in that the speed of the feed roller (6) is preferably 350 revolutions per minute. Device according to one of the preceding claims, characterized in that the distance (a) between the outer surface (10) of the screen drum (5) and the enveloping circle (13) of the feed roller (6) is greater than 1.0 mm. Device according to one of the preceding claims, characterized in that a direction of rotation of the screen drum (5) is directed opposite to a direction of rotation of the feed roller (6). Device according to one of the preceding claims, characterized in that a peripheral speed of the feed roller (6) and the screen drum (5) is the same. Device according to one of the preceding claims, characterized in that the feed roller housing (18) in the region of an inlet opening (22) of the cleaner (1) with the cleaner housing (23) is connected. Device according to one of the preceding claims, characterized in that a distance (b) between the enveloping circle (13) of the feed roller (6) and a surface (16) of the cleaning roller (3) is 30 mm to 250 mm. Device according to one of the preceding claims, characterized in that the axes (7, 8) of the screen drum (5) and the feed roller (6) are arranged parallel to a longitudinal axis (12) of the cleaning roller (3). Device according to one of the preceding claims, characterized in that the length (c) of the feed roller (6) corresponds to the length (d) of the screen drum (5). Process for the cleaning of fiber material (2) with a device having a cleaner (1) having a cleaning roller (3) and a cleaner housing (23) and a condenser (4) arranged above the cleaner (1) and a pneumatic feed of the fiber material (2 ) with transport air (9), wherein the condenser (4) an air-permeable, in a screen drum housing (14) rotatably mounted sieve drum (5) and, in a feed roller housing (18) rotatably mounted feed roller (6), each having a longitudinal axis (7, 8), wherein the feed roller (6) between the screen drum (5) and the cleaning roller (3) is arranged and the fiber material (2) with the transport air (9) directed on an outer surface (10) of the screen drum (5) and taken from the screen drum (5) and the fiber material (2) from the transport air (9) through the screen drum (5) is separated, wherein an interior (26) of the screen drum (5) to a vacuum source (30) is connected characterized . that an enveloping circle (13) of the feed roller (6) and the outer surface (10) of the screen drum (5) do not touch, wherein the feed roller (6) at its periphery in the direction of the longitudinal axis (8) arranged ribs (11) with a has an outer end (15), which form the enveloping circle (13), and that a suction effect generated by the vacuum source (30) is interrupted by a shielding element (19) and the fiber material (2) entrained by the sieve drum (5) is in the region of Shielding element (19) is transferred by the action of centrifugal force to the subsequently arranged feed roller (6).

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