CN101166430A - Tobacco bundle forming device with airflow barrier - Google Patents

Abstract

The invention relates to a cordon forming device (S) pertaining to a cordon machine (P) used in the tobacco processing industry and comprising a rolling chamber (306), and a cordon machine (P) used in the tobacco processing industry, especially a double-cordon machine (P). The invention also relates to the use of an air flow barrier (401, 502). The cordon-forming device is improved by providing an air flow barrier (401, 501) in the rolling chamber (306).

Description

Tobacco bundle forming device with airflow barrier

describe

The present invention relates to a tobacco shred forming device of a cigarette rolling machine in the tobacco processing industry with a stabilizing chamber, and a cigarette rolling machine in the tobacco processing industry, especially a compound cigarette rolling machine. Furthermore, the invention relates to the use of a flow barrier.

The tobacco tuft forming device for forming the tobacco tuft is an integral part of the dispensing device of the cigarette maker. For the formation of the tobacco strands, the distribution device operates according to the so-called fluidized bed method.

From US-PS 4,564,027, a device for continuous tobacco stream construction is known, in which a tobacco shower is collected on an inclined wall, and wherein this is done by means of first a roller, and then An air flow continues to accelerate the tobacco fibers of the tobacco shower in the direction of the tobacco bundle conveyor.

From DE3301031C2 corresponding to US 4,463,768, a device for the formation of tobacco strands is already known, in which a tobacco shower is also first screened, and then by means of an air flow, in the form of accelerated air and suction air , continue to be accelerated on the way to the tobacco tuft conveyor belt.

A method and a device for subdividing tobacco fibers are known from DE4336453A1. In this document subdivision takes place in the drop tube of the dispenser, in which the shredded tobacco is accelerated downwards along a main flight path. In the downpipe, which is bounded by the opposite duct wall, alternately arranged air slots are provided, through which the blowing air is arranged substantially across the flight path with respect to the downwardly flying tobacco. It is thereby steered alternately sideways by its flight path. The loosening and subdivision of the tobacco fibers is associated with the lateral turning. This tobacco fiber, which is subdivided in a large area, is then screened by means of a further air flow, so that the tobacco stems of the other tobacco streams which are transferred to the tobacco bundle are screened out.

Other methods and devices for subdividing tobacco fibers are known from EP1174046A2.

The object of the present invention is to improve the quality of the tobacco tow to be formed in an efficient and simple manner, so that a more uniform density of the fiber tow can be achieved, especially when the tow is produced on a compound cigarette machine.

This task is solved in tobacco tuft forming devices for cigarette makers for the tobacco processing industry with a stabilizing chamber, since a gas flow barrier is provided in the stabilizing chamber.

It has been found in practice that, with certain types of tobacco and/or airflow characteristics or airflow conditions, the quality of two tobacco bundles can be different in a multiple cigarette making machine. Due to the number of tobacco fibers to be moved in the tobacco tuft forming device and the large volume of the stabilizing chamber, the distributed tobacco fiber flow is sensitive to the occurrence of transverse airflows. Furthermore, in current tobacco tuft forming devices, a small amount of air is used for forming the tobacco tuft. Due to the provision according to the invention of an airflow barrier or a flow barrier in the stabilizing chamber of the tobacco forming device, production-disturbing crossflows of air are reduced, prevented or suppressed. Furthermore, the arrangement of the airflow barrier in the stabilizing chamber represents a simple measure which leads to consistent high-quality tobacco tufts over time on multiple cigarette makers. In a tobacco tow forming device which operates in particular according to the fluidized bed method, the cross-flow airflow is reduced by the airflow barrier according to the invention or suppressed according to other variants according to the invention.

According to an advantageous alternative, it is provided that the flow barrier is formed by means of at least one partition. The stabilization chamber is divided into sections by means of one or more partitions arranged in the stabilization chamber, so that quality-impacting lateral air flows are prevented or reduced.

It is provided for this purpose that a plurality of partitions are arranged side by side along the longitudinal direction of the stabilizing chamber.

In particular, at least one baffle or a plurality of baffles are arranged crosswise, in particular perpendicularly, to the stream of tobacco fibers conveyed in the stabilizing chamber. In particular, the stabilizing chamber is thus divided entirely into a plurality of identical parts.

For simple maintenance or to simplify installation in the stabilizing chamber, the partition can be made of several parts. In this case the several parts form a complete partition after assembly, through which disruptive transverse airflows in the stabilizing chamber are avoided.

It is also advantageous if the two partition parts of at least one partition are movable relative to each other.

It is also advantageous if at least one partition has at least one recess as a gas flow barrier.

Furthermore, a preferred alternative is achieved because the at least one partition is formed at least partially in the shape of a sickle or disk.

In an alternative embodiment, the airflow barrier is formed by means of at least one barrier body. At the same time, the barrier body is inserted and arranged as a cylindrical body in the stabilizing chamber for at least partial filling of the stabilizing chamber.

Within the scope of the invention it is of course possible to simultaneously provide a plurality of barriers in the stabilizing chamber in order to suppress or interrupt undesired transverse airflows during the formation of the tobacco bundle.

Especially in order to make the circulation of the air flow possible, the barrier body is arranged at a certain distance from the inner wall of the stabilizing chamber.

It is particularly advantageous when the tobacco strand forming device is configured for the formation of at least one tobacco strand, and in particular for the formation of two tobacco strands.

Furthermore, this object is solved by a cigarette rolling machine for the tobacco processing industry, in particular a compound cigarette rolling machine, which is equipped with the above-described tobacco strand forming device according to the invention. In order to avoid repetitions, refer explicitly to the structure above.

Furthermore, this object is solved by the use of airflow barriers in the stabilizing chamber of the tobacco tow forming device, which is a distribution device in the tobacco processing industry or rather a component of a cigarette making machine. Advantageous configurations of the air flow barrier were described in detail above, so reference is made explicitly to the aforementioned configurations.

Without restricting the general inventive concept, the invention is explained below by way of example by way of example with reference to the drawings, to which reference is also expressly made for the disclosure of all details according to the invention which are not specified in the text.

Figure 1 is a partial schematic longitudinal section through a dispenser of a compound cigarette maker according to the prior art;

Figure 2 is a schematic longitudinal section through a dispenser with a partition through a multiple cigarette maker;

Shown in Figure 3 is a longitudinal sectional view of the stabilizing chamber through the distributor according to the section line drawn in Figure 2;

Shown in Fig. 4 is a variation scheme of the partition in the dispenser of the compound cigarette machine;

Figure 5 shows another variant of the partition in the dispenser of a compound cigarette maker, and

Shown in Figure 6 is a longitudinal section through a stabilizing chamber with a cylindrical body.

In the following figures, identical or identical elements or components are identified with the same reference numerals, so that a new description is not considered each time.

FIG. 1 shows a partial schematic longitudinal section through a dispenser of a schematically represented multiple cigarette maker P, which has a tobacco strand forming device S, by means of which tobacco strands can be formed.

The structure and mode of operation of the dispenser or part V of the dispenser of the multiple cigarette making machine P shown in FIG. 1 are as follows:

The shredded tobacco is usually conveyed by an upward conveyor, not shown in FIG. 1, into a stacker 216, whereby a stock tobacco stock 217 is accumulated in the stacker. The stock tobacco 217 in the stacker 216 is monitored by a photoelectric device not shown. To this end, the take-up conveyor is controlled in such a way that the level of cut tobacco remains constant in the stacker 216 . At the discharge opening 219 of the stacker 216, the shredded tobacco is removed by means of a retrieving device.

The reclaiming device consists of a reclaiming roller 221 and a beating roller 222 with a greatly increased rotational speed relative to the reclaiming roller 221 . The take-up roller 221 is equipped with spike teeth 223 and the relatively fast-rotating knockout roller 222 is equipped with pins 224 . The shredded tobacco fiber shower 226 that beats out from the spike 223 of the take-up roll 221 by the knockout roll 222 arrives in a funnel-shaped, narrowed feed drop tube in the form of a duct 228 along the direction of the arrow 227, An air blast outlet 307 connected to an air box 308 is arranged in the duct.

The blast tuyere 307 blows air between the inner wall 316 of the barrel 228 and the shredded tobacco shower 226, so that the shredded tobacco in the shredded tobacco shower 226 is compacted. In a further embodiment not shown, the compaction can also take place without the blast tuyeres 307 . Furthermore, air is sucked in at the inner walls 315 and 316 through the auxiliary air slots 301 and 302, which at the same time leads to a compaction of the tobacco shower. The guide surface 310 dampens the lateral component of the airflow, thereby achieving a more even distribution of the cut tobacco.

Tobacco showers consist of pre-screened tobacco fibers. For the screening of the shredded tobacco before it is supplied to the shredded tobacco store 217, a sifting air flow blown crosswise to the conveying direction, for example the shredded tobacco showering direction, is generally used. In this case, the light tobacco fibers are separated from the heavy tobacco fibers (tobacco stems), which consist of long tobacco fibers and short light tobacco fibers, and are conveyed away transversely. Further screening may then be performed in order to recover the light tobacco fibers from the screened heavy tobacco fibers.

Tobacco fibers in the barrel 228 are supplied to a guide surface 251 . The tobacco fibers either meet the guide surface 251 or slide on an air cushion composed of air which is introduced into the device, for example through the blower tuyere 307 and/or arrives in the device from auxiliary air gaps.

When the shredded tobacco flow slides on the guiding surface 251, the speed of the shredded tobacco decreases due to the increased slope of the guiding surface 251. Firstly, the guide surface 251 has a relatively large negative slope in the barrel, then it merges into an essentially horizontal slope for the purpose of rising again. Due to the reduced speed and due to the compaction of the tobacco, a sheet 305 of tobacco is formed on the guide surface 251 . It becomes larger at the height of the tobacco sheet due to the reduced velocity. The height and/or density of the tobacco sheet is measured by means of a sensor 309 . This measured value can be designed for regulation and/or control. The sensor can be, for example, an ultrasonic sensor or a laser distance sensor.

In the region of the accelerating tuyeres 303, air is obtained from the air box 304, and the tobacco fiber sheet is opened with a high air velocity so that the tobacco fibers are dispersed individually from the fiber sheet. In this case, in particular, a tight near-wall flow is initially used. Immediately after the acceleration tuyere 303, the tobacco stream 252 is divided into two tobacco streams or tobacco filling streams 256 and 257 at a guide area 253, and it follows the respective tobacco bundle conveyors 263 and 264 on the guide surfaces 261 and 262. direction is conveyed.

Respective shredded tobacco streams are accelerated and supplied to the suction tobacco bundle conveyors 263 and 264 by means of guiding especially the blowing air from the air box 259 against the blowing tuyeres 258 on the guide surfaces 261 and 262 . In particular, a partition 254 is provided between the guide surfaces 261 and 262 .

The two straight upward tobacco fill streams 256 and 257 arrive at two side-by-side parallel suction tobacco strand conveyors 263 and 264, which are each provided by a gas-permeable conveyor belt running along an orifice on the floor of the tobacco duct. Composition, its back is under the suction effect of negative pressure chamber. The blast air remaining in the stabilizing chamber 306 leaks through the sieve 271 into a decompression chamber 272 and is discharged, for example, via a fan.

After the tobacco fibers are subdivided for the first time from the reserve tobacco 216 by combing the tobacco, to the tobacco shower and subsequently form the tobacco fiber sheet, the tobacco is subdivided for the second time by means of an accelerating tuyere 303, in particular in the form of a slit . The shredded tobacco sliding on the guide surface is blown away from each other by the tuyere. Especially in this case the tobacco slides directly onto the guide surface 251 .

In particular, by means of negative pressure, in a stabilizing chamber 306 surrounded by the curved guide surface 251 and the screen 271, the optimal sliding speed of the tobacco before the tuyeres and thus simultaneously the density of the tobacco is adjusted. A higher negative pressure means a higher air velocity in the downcomer and thus a lower density before the first tuyeres. The subdivisions thus become smaller, so that the tobacco streams formed on the tobacco tuft conveyors 263 and 264 are different. Of course, the subdivisions also become smaller in a too thick fiber sheet, so a best effect can be adjusted. Then especially for corresponding negative pressure matching, by sensor 309, determine the stacking height or packing density of shredded tobacco near tuyere 303 for this reason, and/or by means of a pressure sensor (not shown here), determine that in the material stabilizing chamber The air pressure developed in or in an enclosed decompression chamber. The signal from the sensor is supplied to a control device, which thereby controls the amount of air discharged from the decompression chamber 272 as a function of an adjustable throttle valve and/or the rotational speed of a fan.

The device works as follows:

The cut tobacco is removed from the heap as described above and formed into a shower. By the ejection action of the accelerating tuyeres 303 or 307, air is sucked through the auxiliary air slots 301 and 302, which surrounds the shower 226 in the barrel 228, and compacts into a fiber sheet 305. At the same time, the transverse component of the flow disturbance is suppressed by the guide surface 310 . The fiber sheet 305 slides in the area of influence of the acceleration tuyere 303 at a relatively low speed. Air flows from an air box 304 under pressure through the tuyere 303 along the guide surface 251 to the guide area 253 . At the same time the tobacco fibers of the respective leading fiber sheets 305 are caught and pulled out of the sheets and accelerated. The stream 252 thus produced from individual tobacco fibers is divided into two fill streams 256 and 257 of tobacco and fed to tuft conveyors 263 and 264 .

In addition, the remaining blown air from the tuyeres is discharged through the sieve 271 into the decompression chamber 272, from where it is removed by means of a fan or another exhaust device. The negative pressure generated by the venting in the stabilizing chamber 306 is measured by a sensor and is kept constant by the regulation of the venting. In order to achieve an optimal adaptation of the quantity of air introduced through the auxiliary air gap to the quantity of tobacco delivered by the device, the setpoint value of the control can be followed as a function of the machine rotational speed.

The height of the tobacco fiber sheet 305 is continuously monitored by a sensor 309 . If the measured value is outside the tolerance range, the excess air factor or the compression ratio can be adapted by changing the setpoint value of the vacuum adjustment.

When there is a risk of clogging of the cylinder 228 under certain operating conditions, which may occur especially when the machine is started or decelerated, in order to increase the sliding speed of the fiber sheet, it is preferable to connect an additional air box 308 with the associated air box 308. Blast air outlet 307.

In the arrangement shown in Figure 1, the velocity of the tobacco fiber sheet at a point in front of the accelerating tuyeres 303 is in the range of about 1 m/s. The density of the tobacco fiber sheet 305 at this location is about 100 g/l. The thickness or height of the tobacco fiber sheet 305 is there preferably between 1 and 10 mm, and particularly preferably between 1 and 5 mm.

2 to 6 show the design of the air flow barrier or the blocking device according to the invention for interrupting or suppressing the transverse air flow.

In the embodiment shown in FIG. 2, a partition 401 is drawn in the stabilizing chamber 306, which divides the stabilizing chamber 306 into at least two parts along the longitudinal direction. The shape of the partition 401 matches the inner wall of the material stabilizing chamber 306 . The partition 401 itself is modular and consists of an upper part 402 and a lower part 403 . The lower part 403 is deflectably hinged relative to the upper part 402 on the right side of the stabilizing chamber 306 by means of a pin or the like, so that the lower part 403 can move relative to the upper part 402 relative to each other.

FIG. 3 shows a longitudinal section through the stabilizing chamber 306 according to the dotted line III-III drawn in FIG. 2 . In the longitudinal direction of the stabilizing chamber 306, a plurality of partitions 401 are arranged at regular intervals, so the stabilizing chamber 306 is divided or divided by the partitions 401 according to the present invention.

The insertion of the partition 401 in the stabilizing chamber avoids or suppresses the air flowing laterally in the stabilizing chamber 306, thus forming two uniform air flows on the inhaled tobacco strand conveyor (see FIG. 1, reference numerals 263, 264). tobacco bundles.

FIG. 3 also shows that the upper part 402 is U-shaped, whereby the lower part 403 can be inserted into the legs of the inverted U. The lower part 403 can thus be easily pivoted relative to the upper part 402 .

In addition, in Fig. 2, the shape drawn by the dotted line of the partition 401 in the left area shows that the partition 401 or the upper part 402 and the lower part 403, in its shape according to the requirements and geometric dimensions of the stabilizing chamber 306, It can be matched with the stabilizing chamber 306.

FIG. 4 shows a further embodiment of a partition 401 , in which the upper part 402 and the lower part 403 have a sickle shape. The upper part 402 and the lower part 403 thus form a partition 401 with a recess 404 .

Another variant of the partition 401 is shown in FIG. 5 , wherein the partition 401 is arranged in the middle of the stabilizing chamber 306 in the manner of a disk. In order to suppress the lateral air flow, it is possible within the framework of the invention that a plurality of partitions 401 of different configurations are arranged in the stabilizing chamber 306 at a predetermined distance from each other along the longitudinal direction of the stabilizing chamber 306 .

FIG. 5 shows a structural form of an airflow barrier according to the invention. As another alternative for the arrangement of the partition 401, as an airflow barrier in the stabilizing chamber 306, it is possible within the framework of the invention, in which a cylindrical body 501 is inserted and arranged, In a corresponding manner, as in the stabilizing chamber 306 , transverse airflows in the stabilizing chamber 306 can be avoided when one or more partitions 401 are arranged.

In order to avoid lateral air flow in the tobacco bundle forming device S, the cylindrical body 501 matches the geometric dimensions of the stabilizing chamber 306 as required. Furthermore, it is also possible to arrange a plurality of cylindrical bodies 501 simultaneously in the stabilizing chamber in order to influence the properties of the air flow in an advantageous manner by suppressing the transverse air flow.

mark sheet

216 stacker

217 reserve cut tobacco

219 outlet

221 take-up roller

222 beating roller

223 nail teeth

224 pins

226 shower

227 Arrow

228 cartridges

251 guide surface

252 streams

253 guide area

254 Partition

256 Tobacco filling flow

257 Tobacco filling flow

258 blower outlet

259 air box

261 guide surface

262 guide surface

263 Tobacco bundle conveyor

264 Tobacco Conveyor

271 Sieve

272 Decompression chamber

301 Auxiliary Air Gap

302 Auxiliary Air Gap

303 Acceleration vent

304 air box

305 fiber sheet

306 Material stabilization room

307 blower outlet

308 air box

309 sensor

310 guide surface

315 inner wall

316 inner wall

401 Partition

402 upper part

403 lower part

404 groove

501 Cylindrical body

P Duplex Cigarette Rolling Machine

S Tobacco bundle forming device

V splitter

Claims (25)

1. The shredded tobacco forming device (S) of the cigarette machine (P) in the tobacco processing industry has a material stabilizing chamber (306), which is characterized in that an airflow barrier (401, 501). 2. Tobacco strand forming device (S) according to claim 1, characterized in that the airflow barrier (401) is formed by means of at least one partition (401). 3. The shredded tobacco bundle forming device (S) according to claim 2, characterized in that a plurality of partitions (401) are arranged side by side along the longitudinal direction of the material stabilizing chamber (306). 4. The shredded tobacco bundle forming device (S) according to claim 2 or 3, characterized in that at least one partition (401) or a plurality of partitions (401) are connected with the shredded tobacco conveyed in the material stabilizing chamber (306) The fiber streams ( 305 ) are arranged crosswise, in particular vertically. 5. The shredded tobacco bundle forming device (S) according to any one of claims 2 to 4, characterized in that the partition (401) is composed of several parts. 6. Tobacco strand forming device (S) according to one or more of claims 2 to 5, characterized in that the two partition parts (402, 403) of at least one partition (401 ) are mutually relatively mobile. 7. The tobacco tuft forming device (S) according to one or more of claims 2 to 6, characterized in that at least one partition (401 ) has a groove (404). 8. Tobacco tuft forming device (S) according to one or more of claims 2 to 7, characterized in that at least one partition (401) constitutes at least partly a sickle shape. 9. Tobacco strand forming device (S) according to one or more of claims 2 to 7, characterized in that at least one partition (401) is formed in the shape of a disc. 10. The tobacco strand forming device (S) according to claim 1, characterized in that the air flow barrier (401, 501) is formed by means of at least one barrier body (501). 11. The shredded tobacco bundle forming device according to claim 10, characterized in that, the blocking body (501) is arranged at a certain distance from the inner wall of the stabilizing chamber (306). 12. Tobacco bundle forming device (S) according to one or more of claims 1 to 11, characterized in that the tobacco bundle forming device (S) is configured for at least one tobacco bundle, and in particular two Tobacco bundle formation. 13. Cigarette rolling machine (P) for the tobacco processing industry, in particular a compound cigarette rolling machine (P), with a tobacco strand forming device (S) according to one or more of claims 1 to 12. 14. Use of airflow barriers (401, 501) in the stabilizing chamber (306) of the tobacco tuft forming device (S) of a cigarette making machine (P) in the tobacco processing industry. 15. Use according to claim 14, characterized in that the airflow barrier is formed by means of at least one partition (401). 16. The use according to claim 15, characterized in that a plurality of partitions (401) are arranged side by side along the longitudinal direction of the material stabilizing chamber (306). 17. Use according to claim 15 or 16, characterized in that at least one baffle (401) or a plurality of baffles (401) intersect the shredded tobacco fiber flow (305) conveyed in the stabilizing chamber (306) , especially in vertical arrangements. 18. Use according to any one of claims 15 to 17, characterized in that the partition (401 ) is a multipart ground. 19. Use according to one or more of claims 15 to 18, characterized in that the two partition parts (402, 403) of at least one partition (401) are movable relative to each other. 20. Use according to one or more of claims 15 to 19, characterized in that at least one partition (401) has a groove. 21. Use according to one or more of claims 15 to 20, characterized in that at least one partition (401) constitutes at least partly a sickle shape. 22. Use according to one or more of claims 15 to 21, characterized in that at least one partition (401) is formed in the shape of a disc. 23. Use according to claim 14, characterized in that the air flow barrier (401, 501) is formed by means of at least one barrier body (501). 24. The use according to claim 23, characterized in that the barrier (501) is arranged at a certain distance from the inner wall of the material stabilizing chamber (306). 25. Use according to one or more of claims 14 to 24, characterized in that the tobacco strand forming device (S) is configured for the formation of at least one tobacco strand, and in particular two tobacco strands.

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