EP1825767B1 - Strömungskörper einer Zigarettenstrangmaschine - Google Patents

Abstract

The body (60) has a trough shaped transport surface (601) that is utilized for tobacco flow. A suction device is provided on a lower side (603) facing the transport surface for a part of feed air of another tobacco flow. The suction device is divided into a set of chambers, and a control device is provided for controlling air sucked off by the suction device. The suction device is arranged in an end region of the body.

Description

The invention relates to a flow body of a strand machine of the tobacco-processing industry with a, in particular trough-shaped, transport surface for a first stream of tobacco. Moreover, the invention relates to an arrangement of a flow body in a distributor of a strand machine of the tobacco-processing industry, in particular multiple cigarette rod machine, preferably double cigarette rod machine. Moreover, the invention relates to a rod making machine of the tobacco processing industry, in particular a multiple cigarette rod maker, preferably a double cigarette rod maker.

Stranding devices for forming tobacco rods are components of distribution devices of tobacco rod making machines. The distribution devices are operated for tobacco rod formation according to the so-called fluidized bed method.

In EP-A-1 364 588 For example, an arrangement and method for building at least two tobacco rods in a cigarette rod making machine are disclosed. In this case, the arrangement has feeding means for conveying in particular metered and / or sighted tobacco to at least two flow surfaces leading to at least one suction strand conveyor each.

In the region of the at least two Saugstrangförderer an air extraction is provided, wherein the air extraction is arranged in the flow direction in front of each Saugstrangförderer. This allows us a uniform strand formation. The air extraction ensures that the excess of air provided for the tobacco flow on the flow surfaces is extracted.

EP-A-1 516 545 moreover discloses a multi-strand machine for the simultaneous production of at least two double strands, wherein the strand machine comprises two strand conveyors. A total of four fluid beds are provided, which continuously tobacco is conveyed as a nonwoven to the downstream strand conveyor.

Also revealed DE-A-44 42 538 a double-stranded cigarette manufacturing device having two inlets and two separate lines, so that tobacco is conveyed via the lines to corresponding outlets.

Based on this prior art, the object of the present invention is to improve the extraction of transport air from at least one tobacco stream in the field of tobacco rod conveyors of a strand machine in a simple manner.

This problem is solved by a flow body of a Extrusion machine of the tobacco-processing industry with a, in particular trough-shaped, transport surface for a first stream of tobacco, which is further characterized in that on the side facing away from the transport surface of the first tobacco stream, a suction device for at least a portion of the conveying air of a second tobacco stream is provided. Here, the suction device according to the invention is arranged with a vacuum source on the underside of the arranged in a manifold flow body. On the upper side of the flow body, the transport surface is formed in cross-section U-shaped or trough-shaped for the upper side (first) tobacco stream.

The underside suction device on the opposite side of the Transport surface for the top-side first tobacco stream is subjected to negative pressure during operation of the stranding machine, so that air is discharged from the second tobacco stream, which is conveyed on a second transport surface assigned to the underside of the flow body. In addition, in the strand forming unit, for example, a double-strand machine from the first tobacco stream conveyed on the first transport surface of the flow body according to the invention, the transport air is also removed from the first tobacco stream by means of a further, in particular different (not shown in the figures), suction device.

By means of the flow body according to the invention, it is possible to transport transport air from the front tobacco stream, so that the discharged air is conveyed through the flow body, for example against the conveying direction of the tobacco rod formed and / or to the interior of the machine or the flow body.

As a result of the flow body according to the invention, the supply channels of the tobacco stream are subdivided into tobacco rod conveyors, so that one end of the flow body with its suction device for the outer or front tobacco stream sucks the air. Furthermore, the arrangement of the flow body in a distribution device or in a strand formation device ensures that air is removed from the second tobacco stream, the extraction point being arranged close to the region of the suction strand conveyor.

The tobacco fleece is kept flat in front of the Saugstrangförderer by avoiding turbulence, at the same time a large distance to the suction surface is achieved because due to the centrifugal force acting on the tobacco stream, the tobacco particles on the the bottom of the flow body associated second transport surface is promoted. Due to the acting centrifugal forces, with the simultaneous suction of the air from the tobacco stream in the region of the suction belt conveyor for the front tobacco rod, tobacco sticking in the effective region of the suction device of the flow body is largely avoided.

In particular, the air is aspirated substantially transversely, preferably horizontally, from the first and the second tobacco stream.

Characterized in that the suction device is divided into a plurality of chambers, it is achieved that a predetermined negative pressure profile along the tobacco rod formed in accordance with a predetermined requirement profile is adjustable.

In addition, the predetermined negative pressure profile along the chambers or the suction device in the region of the tobacco rod formed is possible in that a control or regulating device is provided for the control or regulation of the suctioned from the suction air from the second tobacco stream. In the context of the invention, it is also obvious that a corresponding regulation or control of the suction device, which is assigned to the first tobacco stream or tobacco rod, is also possible for the first tobacco rod.

In particular, it is preferred if the suction device is arranged at one end or at an end region of the flow body.

Characterized in that the suction device of the flow body as a cover has a grid or perforated plate, it is avoided that tobacco fibers get into the suction device or in their suction channels.

In order to form a predetermined pressure profile within a chamber of the suction device, it is furthermore advantageous if at least one chamber is subdivided or subdividable into a plurality of partial volumes, for example two partial volumes. As a result, the Saugluftverteilung along the height or the width of a chamber is adjusted accordingly.

For this purpose, according to a further embodiment of the flow body, a partition wall, in particular a separating slide, is provided in the at least one chamber. In particular, the partition wall or the separating slide is movable or movable, in particular displaceable, arranged in the chamber.

Moreover, in one possible development, the air extracted by the suction device is removed from the second tobacco stream counter to the transport direction of the tobacco rod formed from the second tobacco stream.

In one embodiment, the control device or regulating device of the flow body can have at least one, in particular pivotable, throttle valve or a plurality of pivotable throttle valves, as a result of which the negative pressure conditions on the flow body can be set in a targeted manner. For this purpose, it is further provided that the at least one throttle valve can be fixed or a plurality of throttle valves are fixed after appropriate adjustment.

Furthermore, in a further embodiment, advantageously for the first tobacco stream conveyed on the transport surface of the flow body, a transport nozzle, in particular a blowing-air nozzle, is provided. intended.

Furthermore, the object is achieved by an arrangement of a flow body in a distributor of a strand machine of the tobacco-processing industry, in particular multiple cigarette rod machine, preferably double cigarette rod machine, wherein the flow body is designed according to an embodiment described above.

In addition, the object is achieved by a rod making machine of the tobacco processing industry, in particular multiple cigarette rod machine, preferably double cigarette rod machine, which is arranged with a flow body according to the invention described above in a manifold of a multi-strand machine. To avoid repetition, reference is expressly made to the above statements.

Fig. 1

eine schematische Darstellung einer Anordnung zum Aufbau von zwei Tabaksträngen in einer Doppelstrangzigarettenmaschine;

Fig. 2

eine perspektivische Darstellung eines erfindungsgemäßen Strömungskörpers;

Fig. 3

eine weitere perspektivische Darstellung eines Strömungskörpers;

Fig. 4

schematisch einen Querschnitt durch eine Strangbildungseinheit bzw. einen Verteiler einer Doppelstrangmaschine mit einem erfindungsgemäßen Strömungskörper und

Fig. 5

eine Ausführungsform einer Kammer einer Saugeinrichtung an einem Strömungskörper.

In the following the invention will be described by means of embodiments with reference to the drawings without limiting the general inventive concept, with respect to all not explained in detail in the text details of the invention is expressly made to the drawings. Show it:

Fig. 1

a schematic representation of an arrangement for the construction of two tobacco strands in a double-strand cigarette machine;

Fig. 2

a perspective view of a flow body according to the invention;

Fig. 3

a further perspective view of a flow body;

Fig. 4

schematically a cross section through a strand forming unit or a distributor of a double-strand machine with a flow body according to the invention and

Fig. 5

an embodiment of a chamber of a suction device on a flow body.

In the following figures, the same or similar elements or parts are denoted by the same reference numerals, so that apart from a new idea.

Fig. 1 shows an arrangement for the construction of two tobacco strands in a cigarette rod machine schematically in cross section, wherein the representation of Fig. 1 only represents the essential elements of the invention of a tobacco distributor.

From a pneumatic tobacco feed lock 11 tobacco is fed to a pre-distributor 10, which is provided with the raking rollers 12 and 13. The pre-distributor 10 opens into a tobacco reservoir 16, the discharge side is associated with a steep conveyor 17, which cooperates with a tobacco combing paddle roller 18 and with a leading into a down feed chute 19 tobacco separating roller 21. The feed chute 19 is bounded by a boundary plate 20. The feed chute 19 opens laterally into a section of a viewing means in the form of a vertically arranged zig-zag separator 22.

The zig-zag sifter 22 is part of a circulating air system 24 operated by a cross-flow fan 23. Based on the flow direction of the circulating air system 24, it is downstream of the cross-flow fan 23 a Umluftkrümmer, provided that merges in the region of its outer radius in a branching off from the circulating air system 24 bypass and in the region of its inner radius in an excess flow channel in which a tobacco excess transport means in the form of a screw conveyor and a cellular wheel opens. These details are in Fig. 1 not shown but, for example, in Fig. 1 or Fig. 4 of the DE 101 54 807.9 , Reference is made in this regard in full to the aforementioned patent application.

In the recirculation system 24 of the separator circuit also designed as a Coanda separator tobacco / air separator 26 is connected on both sides of a Abscheidekante 36 on the one hand to the suction side of the crossflow fan 23 and on the other hand into a above two storage bays 40, 40 'arranged rotary valve 37 opens ,

The substantially perpendicularly arranged storage compartments 40, 40 'terminate with their shaft outlets, which may be designed as vibrating shaft outlets with corresponding vibration elements, at the lower end in each case via a removal roller 42, 42' cooperating with a rollover roller 41, 41 '. Between the storage spaces 40, 40 'and the rotary valve 37, an impeller 38 is still provided for portioning the tobacco and a distribution element 39, by means of which alternately the two storage spaces 40, 40' can be filled in portions with tobacco.

The rotary feeder 37 serves to separate transport air from the circulating air system 24 from the tobacco, which is conveyed by the tobacco separation chamber 81 above the rotary valve 37 to this.

According to Fig. 1 is below the extraction rollers 42, 42 'respectively a guide channel is visible, which is bounded by a guide surface, which merges into the subsequent flow channels 44, 44 '. The flow channels 44, 44 'are superimposed. By means of Blasluftzuführungen 43, 43 ', a tobacco-conveying air flow is generated in the flow channels 44, 44'.

The upward flow channels 44, 44 'open below a strand assembly unit of a double-strand machine, wherein in Fig. 1 schematically two Saugstrangförderer 50, 50 'are shown. The Saugstrangförderer 50, 50 'are corresponding to the DE 36 19 579 C2 built up. The upwardly aspirating tobacco infill flows pass accordingly Fig. 1 to two suction belt conveyors 50, 50 'arranged parallel to one another, each of which consists of a permeable conveyor belt running along a perforated bottom, essentially a tobacco channel, whose rear side is under the suction effect of a vacuum chamber. The excess transport air is sucked by means of Luftabsaugelementen 30, 30 '. The transport air itself is introduced by means of a schematically indicated air flow 43 or 43 'into the flow channels 44 and 44' on the input side.

The tobacco / air separator 26 is arranged around a tubular body 48. The zig-zag sifter 22 is equipped with a screw 47, with which the separated Sichtgut, such as tobacco ribs, is removed. There may be other elements, such as a Nachsichter provided in the DE 101 54 807.9 are described.

The mode of operation of the separator system, which is used to prepare a fleece-like tobacco stream which has been converted into a strand-forming path and integrated into the distributor of a cigarette rod machine, is as follows:

Tobacco passes through the feed lock 11 and the predistributor 10 into the tobacco reservoir 16 to the steep conveyor 17, from which the classifier system is charged with a continuous stream of tobacco by combing tobacco from the tobacco reservoir 16 with the steep conveyor 17 equipped with steep conveyor combs. In order to achieve a uniform occupancy of the steep conveyor 17, excess tobacco is scraped off by the paddle roller 18. By monitoring the rotational speed of the steep conveyor 17, a machine stop can be initiated at a reduced rated speed, e.g. To prevent damage by foreign bodies.

The tobacco lying on the steep conveyor 17 enters the area of action of the separating roller 21, which accelerates the tobacco into the zig-zag sifter 22 by coarse pre-singling and whose speed is set in terms of a compromise between tobacco destruction and necessary singling, preferably in one Range between 800 and 900 revolutions per minute.

Due to the characteristic shape of the zigzag sifter 22, on the one hand light tobacco fibers of the tobacco stream are transported upwards and on the other hand the tobacco stream is displaced in a direction transverse to the main flow. Since the airfoil is inhomogeneous, there are areas of high and low air velocity, which put the tobacco fibers in a circular motion, called vortex rolls. In this way, the ribs contained in the tobacco stream are extracted and moved by gravity down. Light tobacco fibers are repeatedly transported step by step in the zigzag sifter 22 upwards. This process takes place in each trained as a gob sight stage.

The precipitated from the zigzag sifter 22 ribbed material can be blown by a Nachsichter using branched off from the circulating air classifying air, which are still transported back to the ribs lighter tobacco particles are transported back into the main air flow. The tobacco ribs are then discharged by means of a lock in a known manner, with this particular on the DE 101 54 807.9 is referenced.

The sighted tobacco stream passes into the tobacco / air separator 26, in which the separation of tobacco and air by the centrifugal force and the Coanda effect, the tobacco fibers moved by the centrifugal force on the outer geometry in the form of a curved outer side of the separator 26 along are due to the Coanda effect on the inner radius of the geometry in the form of a cylindrical surface of a tubular body 48 applies. At the separation edge 36, the final separation of air and tobacco takes place, the air separated from the tobacco is fed back to the crossflow fan 23, which has a uniform flow profile or over the width (perpendicular to the plane) of the distributor a homogeneous velocity distribution.

The tobacco separated in the tobacco / air separator 26 is discharged out of the vision system by the rotary valve 37 and arrives via an impeller 38 for positioning the amounts of tobacco to two storage spaces 40, 40 ', wherein in the in Fig. 1 illustrated position of the distributor element 39, the tobacco portion of the right stomp box 40 'is promoted. In the position of the distributor element 39 shown in dashed lines, tobacco enters the stowage chamber 40 shown on the left. In the arrangement itself, the stowage compartments 40 and 40 'are arranged one behind the other and extend over the entire width of the arrangement, which is perpendicular to the plane of the drawing.

From the storage spaces 40, 40 'of the tobacco by means of the removal rollers 42, 42' and the racket rollers 41, 41 'in a finely divided form via a guide surface on two nozzle recesses formed with flow channels 44, 44' transferred. Respective Blasluftzuführungen are represented by the characters 43 and 43 ', with additional Blasluftzuführungen, such as. In the DE 101 54 807.9 or the EP 1 174 046 A2 can be used very well to achieve excellent separation of tobacco fibers.

It is in compliance with an ideal pressure in the form of a slight negative pressure in the vicinity of 0 mbar in a known manner a close-fitting tobacco fluidized bed flow to strand assembly or as in Fig. 1 represented to the Saugstrangförderern 50, 50 'produced, whereby also over the entire width of the arrangement a tobacco fluidized bed flow is achieved. Preferably, control units are also provided for setting and maintaining optimum flow conditions and pressure conditions, in particular in Fig. 1 Luftabsaugelemente 30, 30 'just before the Saugstrangförderern 50, 50' are arranged to be able to suck off excess air can.

The Saugstrangförderer 50, 50 'promote tobacco, which is not shown, in the direction 91, ie in the plane of Fig. 1 ,

Through the construction of tobacco strands over the entire width of the arrangement, a very homogeneous and very rapid tobacco rod formation can be done. For this purpose, two storage spaces are preferably used, which are formed over the entire width of the arrangement, so that a uniform and rapid strand formation is possible.

In Fig. 2 the arrangement of two nozzle wells 60 and 61 is shown schematically in a perspective view. The tobacco fibers of the first tobacco stream in the flow channel 44 and the second tobacco stream in the flow channel 44 'are guided with blown air to Saugstrangförderer and the Saugstrangförderer tobacco fibers are held by suction on the suction belts and transported to a strand unit of the strand machine. Trained as a flow body nozzle trough 60 is disposed above the nozzle trough 61 and passes on its upper-side flow surface 601 tobacco fibers of the first tobacco stream to Saugstrangförderer (see. Fig. 1 , Reference numeral 50).

For the sake of better representability was in Fig. 2 apart from the upper-side boundary of the flow channel 44. The nozzle trough 60 has a cross-sectionally U-shaped or trough-shaped transport surface 601 on its upper side. Further, in the reversal point of the trough-shaped transport surface 601, a Blasluftleiste 602 is arranged to accelerate the tobacco fibers on the transport surface 601 at the reversal point to the Saugstrangförderer.

Due to the exerted accelerations of the tobacco fibers on the transport surface 601, the tobacco fibers of the top-side first tobacco stream corresponding to the centrifugal forces in the flow channel 44 on the transport surface 601 in the region of the associated Saugstrangförderers (see. Fig. 1 , Reference numeral 50), so that the associated for the inner first tobacco stream or tobacco rod air extraction (see. Fig. 1 Reference numeral 30) on the side remote from the tobacco flow of the flow channel 44 sucks transport air from the first tobacco stream.

The lower nozzle cavity 61 is also formed in a U-shaped or trough-shaped in cross section, so that the transport surface 611 in cooperation with the bottom 603 of the upper nozzle trough 60 forms the flow channel 44 'for the second lower tobacco stream.

In order to accelerate the tobacco fibers of the lower second tobacco stream at the reversal point of the trough surface 611, the lower nozzle trough 61 also has a blowing air nozzle 612 in the form of a nozzle bar.

The second stream of tobacco is conveyed upwards on the transport surface 611 to the second outer strand conveyor (cf. Fig. 1 , Reference numeral 50 '). Due to the centrifugal forces on the tobacco fibers no tobacco fibers on the transport surface 611 associated bottom 603 (see. Fig. 3 ) of the upper nozzle trough 60 promoted.

The upper nozzle depression 60 forms a flow body in the distributor unit of the stranding machine, in particular a double stranding machine, wherein in the region of the strand conveyors in the upper region 70 of the nozzle depression 60 on the underside 603, ie on the side facing away from the transport surface 601 for the first tobacco flow, a suction device 80 almost is formed or arranged over the entire width of the nozzle cavity. In Fig. 2 the suction device 80 is largely concealed on the underside 603 of the upper nozzle trough 60 by the lower nozzle trough 61.

In Fig. 3 FIG. 12 shows a perspective view of the nozzle well 60, which is arranged as a flow body in the distributor unit of a stranding machine. For reasons of better representability was on the representation of covers in the form of pinholes, gratings or the like for the suction in Fig. 3 apart. On the lower side 603, adjacent to each other, separate suction chambers 81 are arranged in the upper region 70 or in the tapered end region of the nozzle depression 60 over their entire width. The suction chambers 81 have a grid-like (not shown here) cover, so that only a small amount of tobacco fibers of the second tobacco stream can reach the suction chambers 81 by the applied negative pressure.

Below the suction chambers 81 are pivotable throttle 82 associated with each suction chamber 81, so that over the horizontal width of the nozzle cavity 60 in the upper region 70, a corresponding adjustable negative pressure profile upon application of a negative pressure to the suction chambers 81 is formed. The adjustability of the pivotable throttle valve 82 thus controls the air flow through the suction chambers 81 or controlled accordingly, whereby the desired negative pressure profile along the suction chambers 81 and along the width of the nozzle cavity is formed.

In order to form a control of the throttle valves 82, according to one embodiment in the flow channels (see. Fig. 1 Reference numerals 44, 44 ') are provided corresponding sensors.

In Fig. 4 shows a cross section through a strand forming unit of a distributor with a nozzle body 60 according to the invention designed as a flow body. The nozzle depression 60 has a partition wall 604, so that in the upper region of the nozzle depression 60, the blowing-air nozzle 602 (cf. Fig. 2 ) and possibly additional blown air nozzles are supplied on the top of the nozzle cavity 60 with blown air or compressed air. The pressurization of the nozzles with compressed air is in Fig. 4 indicated by arrows pointing to the left in the upper region of the nozzle trough 60 schematically.

Below the partition wall 604, the individual suction chambers 81 are acted upon on the underside 603 of the nozzle cavity 60 with negative pressure, so that air is sucked from the lower, ie second tobacco stream, which is transported on the transport surface 611 of the lower nozzle cavity. Here, the extracted air is discharged within the nozzle cavity 60 down. This is in Fig. 4 indicated by arrows pointing to the bottom right in the lower part of the nozzle trough 60.

In the lower region of the nozzle trough 60, an opening 605 is further formed, so that the air discharged from the suction chambers 81 is transported away laterally.

In Fig. 5 an embodiment of a suction chamber 81 is described by way of example in a perspective view. The suction chamber 81 has on the side of the second tobacco stream associated side, ie on the bottom 603 of the nozzle cavity 60 via a grid-like or perforated plate-like cover 83, so that upon application of negative pressure in the suction chamber 81 prevents tobacco fibers from the tobacco stream into the suction chamber 81 as far as possible. In the interior of the suction chamber 81, a displaceable or adjustable separating plate 84 is arranged along its height, so that the suction chamber 81 is subdivided into different partial volumes, in the present case into two partial volumes.

By dividing the suction chamber 81 into two or more volumes, the suction air distribution along the height of the suction chamber 81 is adjusted or distributed accordingly. As a result, pressure differences along the height of the suction chamber are adjusted accordingly or avoided or reduced.

LIST OF REFERENCE NUMBERS

10

preliminary distributor

11

Tobacco load lock

12

computing roller

13

computing roller

16

tobacco reservoir

17

vertical conveyor

18

paddle roller

19

feed chute

20

limiting sheet

21

separating roller

22

Zigzag classifier

23

Cross-flow fan

24

air circulation system

26

Tobacco / air separator

30, 30 '

Luftabsaugelement

35

lock

36

cutting edge

37

rotary

38

impeller

39

distributor

40, 40 '

accumulating shaft

41, 41 '

picker roller

42, 42 '

out roller

43, 43 '

airflow

44, 44 '

flow area

47

slug

48

pipe body

50, 50 '

suction rod

60

Nozzle trough / flow body

61

nozzle trough

70

upper area

80

suction

81

suction chamber

82

throttle

83

cover

84

Divider

91

conveying direction

601

transport surface

602

blowing air nozzle

603

bottom

604

partition wall

605

opening

611

transport surface

612

blowing air nozzle

Claims (13)

1. Flow body (60) of a rope machine of the tobacco-processing industry comprising an, in particular trough-shaped, conveying surface (601) for a first tobacco stream, characterized in that at the side (603) remote from the conveying surface (601) of the first tobacco stream a suction device (80) for at least a fraction of the conveying air of a second tobacco stream is provided.
2. Flow body (60) according to claim 1, characterized in that the suction device (80) is subdivided into a plurality of chambers (81).
3. Flow body (60) according to claim 1 or 2, characterized in that a control device (82) or regulating device (82) is provided for controlling or regulating the air extracted by the suction device (80) from the second tobacco stream.
4. Flow body (60) according to one of claims 1 to 3, characterized in that the suction device (80) is disposed in an end region (70) of the flow body (60).
5. Flow body (60) according to one of claims 1 to 4, characterized in that the suction device (80) has as a cover a screen or perforated plate.
6. Flow body (60) according to one of claims 2 to 5, characterized in that at least one chamber (81) may be or is subdivided into a plurality of partial volumes.
7. Flow body (60) according to claim 6, characterized in that a dividing wall (84), in particular a shut-off valve (84), is provided in the at least one chamber (81).
8. Flow body (60) according to claim 7, characterized in that the dividing wall (84) is disposed in a moving or movable, in particular displaceable manner in the chamber (81).
9. Flow body (60) according to one of claims 3 to 7, characterized in that the control device (82) or regulating device comprises at least one, in particular pivotable, throttle valve (82).
10. Flow body (60) according to claim 9, characterized in that the at least one throttle valve (82) is fixable.
11. Flow body (60) according to one of claims 1 to 10, characterized in that for the first tobacco stream conveyed on the conveying surface (601) a conveying nozzle (602), in particular a blast air nozzle (602), is provided.
12. Arrangement of a flow body (60) in a distributor of a rope machine of the tobacco-processing industry, in particular a multiple cigarette rope machine, preferably a double cigarette rope machine, wherein the flow body (60) is designed in accordance with one of claims 1 to 11.
13. Rope machine of the tobacco-processing industry, in particular a multiple cigarette rope machine, preferably a double cigarette rope machine, having a flow body (60) according to one of claims 1 to 11.

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