EP1787732B1 - Device to aspirate particles resulting from manufacturing operations on moving webs - Google Patents

Abstract

The device has a material web (2) projecting around a guide or deflection pulley (1) in a housing (3), where the pulley protrudes through an opening (4) in a lower side of the housing. The opening extends over an entire width of the pulley and is narrowed by edges in a longitudinal direction, where the edges maintain a small distance to a shell surface of the pulley and/or the surface of the web. The housing has an air supply channel (7) and an air discharging channel (8) that are arranged opposite to each other in the direction, and an air flow is guided through the channels in the direction.

Description

The invention relates to a suction device as an additional device for a device for carrying out operations on moving material webs for the removal of particles resulting from such processing, wherein the material web during such processing around at least one guide or deflection around or in close contact with her is guided over them and wherein the suction device is arranged in the region of such a guide or guide roller, and in the longitudinal or conveying direction of the material web opposite an air supply channel and an air discharge channel, which at a distance from the lateral surface of the guide or guide roller and the material web one of the lateral surface of the guide or deflecting roller shaped guide surface are connected to each other, so that between this guide surface and the lateral surface of the guide or guide roller, an air passage is formed.

During processing, for example when cutting moving material webs, this very movement of the web, by entraining air, creates a laminar flow, which manifests itself as an air layer lying above the web, and this air layer is thicker, ie, the more air becomes entrained, the rougher the surface of the web is. As a result of this laminar flow of air, particles that are formed or detaching during processing, for example, cutting dust or production-related surface dust when cutting paper webs or fibers or chips, are then taken away and distributed in the environment. In known suction devices, as in such Processing machines are currently used to remove such machining particles, the suction is targeted to the processing site, where the particles, such as machining dust, shavings or fibers arise, so that the resulting particles can be sucked only at this point. Particles entrained by the movement of the material web are not detected. This affects the more disadvantageous the faster the material web is moved. If the feed rate is, for example, 17 m / sec, which is customary, for example, in the printing industry, then the resulting particles are only within the field of action of such a known suction device for a very short time; They are then entrained in a considerable amount by the laminar flow and then sink again and can lay like snow on the machine in question. This requires maintenance and cleaning work on such machines at short intervals, for which they must be brought to a standstill, the actual operation must therefore be interrupted; the work efficiency is greatly reduced.

By the EP 0 887 160 A2 is a suction device for removing dust, which arises when cutting paper, cardboard and the like known. The paper web passes between two counter-rotating cutting blades. In the direction of movement after the cutting blades open laterally above and below the paper web and facing each other two suction pipes, which are connected to suction devices and sucked by the resulting cutting dust targeted and only at this point, but not the dust content caused by the movement of the web and the mentioned laminar flow is taken. Even laterally the cutting blade propagating machining dust is not or insufficiently detected. The extraction point is not shielded to the outside, so that still Dust can get into the environment. The arrangement of two separate suction devices is complicated and costly.

With the DE 88 15 327 U1 is a protective cover for portable machines, such as circular saws, hand grinders and the like. Proposed, in which along the upper guard wall, a dust discharge channel is integrated, which starts at the top of the guard and passes in the rear portion of the guard into a suction. Even with this device processing dust is targeted only directly before the processing site, ie in this case, for example, in front of a saw blade or a grinding wheel, sucked off and transported away. For processing on a stationary object, this may be sufficient when cutting on a moving material web, this will always entrained processing dust from this, which can not be detected with such a device, but enters the environment.

The US 5 774 992 A describes a device for a circular saw, in which two superimposed plates include one or more chambers communicating with each other, which are in communication with hose connections of a suction device. The plates have two superposed slots through which the saw blade of a circular saw mounted on the top plate projects. The bottom plate provides a sliding surface that allows the saw to be moved over a workpiece. Processing dust should collect in the chambers formed by the plates and be sucked through the hose connections.

By the generative WO 01/76777 A1 a suction device is known, in which two nozzles, an air supply and form an air discharge channel, facing in the longitudinal direction and are interconnected by a so-called guide surface. This guide surface consists of a simple sheet that follows the rounding of a guide roller and this partially overlaps. The thus formed between the guide surface and the lateral surface of the guide roller channel is open at the side, and the guide roller protrudes on both sides beyond the lateral edges of the guide plate; this promotes the distribution of machining dust into the environment. The two nozzles are pointed at the guide roller, processing dust is detected and discharged insufficient.

After EP 0520 145 a housing is disposed above a guide or deflection roller for a material web, which has arranged one behind the other a first and a second suction chamber and three so-called disturbance openings, which open into a common surface. The first and the second suction chamber each emerge from the housing as a narrow channel over the material web and are directed onto the material web only in a narrow strip, quasi linearly, so that machining dust or other particles produced during processing only in this narrow area can be sucked off. To alleviate this disadvantage, a second suction chamber is just provided and disturbance openings, which are provided in front of and behind the suction chambers, are intended to whirl up particles which are then supplied by a particular device in front of the housing in the direction of movement of the material web and behind the housing against the direction of movement of the material web Air flow are taken in the direction of the suction chambers. The special measures lead to a complicated and expensive device, with which nevertheless the distribution of processing dust on both sides of the device is not effectively prevented or at least can be significantly reduced because the guide or deflection roller for the material web is free on all sides.

Even after the EP 0 682 992 A2 the guide or deflection roller is free on all sides, not covered in any direction. Over the material web, a suction device is arranged, over whose directed onto the material web slot nozzles processing dust can be dissipated only in a narrow, linear range.

The object of the invention is to provide a suction device for removing particles formed during processing on moving material webs, such as dusts, chips, fibers and the like, with which such particles not only directly at the place of formation, i. the processing point, but also along the path that takes the web after the processing point still within the processing machine, highly effective and as completely sucked off and can be removed, so that possible no or as few particles get into the environment or pollute the machine and the machine remains maintenance free for a long period of time.

This object is solved by the features of claim 1.

The new suction device has a housing, which comprises the guide roller or deflection roller of a processing machine, around which the material web is guided or over which it is guided away in close contact, at least in a hood-like manner. The housing has on its underside an opening which extends over the entire width of the guide or deflection roller and through which the guide or deflection roller projects into the housing; this is the opening delimited in the longitudinal direction defined by the movement of the material web by edges that hold little distance from the lateral surface of the guide or deflection roller or to the surface of the material web. The air passage is formed by the wall of the housing between the air supply passage and the air discharge passage of the peripheral surface of the guide or guide roller is approximated. The air flow guided through the air flow channel breaks the laminar flow over the moving material web, dissolves the particles entrained by it and transports them away, eg into a collecting device with a filter system. The approach of the housing wall to the peripheral surface of the guide or deflection roller, the air flow in this area undergoes an acceleration, whereby its effect acts amplified.

By the housing comprises the guide or deflection roller hood-like at least in part and the opening, through which the guide or deflection roller projects into the housing from below, extends over the entire width of the guide or deflection roller, machining dust or other Particles in a wide range of movement of the web, and not only punctually or linearly effectively dissipated and by the hood-like embracing the guide or guide roller through the housing, the processing point is shielded to the outside, so that processing dust is no longer distributed in the environment, but with recorded and removed.

If the clear width of the air discharge channel is chosen to be greater than the clear width of the air supply channel, the air flow slows down in the air discharge channel, the air expands and is pushed upwards, thereby lifting off particles that should still be on the material web; These get into the air flow and are transported away.

Advantageously, the air supply channel and the air discharge channel extend over the entire width of the guide or deflection roller or the material web.

At least one fluidizing point may be provided between the air supply channel and the air discharge channel on the inner wall of the air flow channel. By thus achieved turbulence in the air flow of this is brought with higher energy and closer to the web.

Preferably, the one or more vertebral points may be formed by projections or indentations of the housing wall.

The air flow can be passed in the direction of movement of the web through the housing; in high speed webs, e.g. in the printing industry usual 17m / sec, but it is advantageous if the air flow is directed against the direction of movement of the web through the housing.

It is advantageous and increases the desired effect when the air flow is directed at the air supply duct at right angles or at approximately the right angle to the material web.

Fig. 1

den schematischen Längsschnitt durch eine Leit- oder Umlenkrolle für eine durch eine Bearbeitungsmaschine bewegte Materialbahn und eine Absaugvorrichtung nach einer ersten Ausführungsform der Erfindung,

Fig. 2

einen schematischen Längsschnitt gemäß Fig. 1 mit variierter Führung der bewegten Materialbahn,

Fig. 3

einen schematischen Längsschnitt gemäß Fig. 1 mit einer anderen Ausführungsform der Absaugvorrichtung,

Fig. 4

den schematischen Längsschnitt durch eine Fortbildung der Absaugvorrichtung gemäß Fig. 2 mit gleicher Bahnführung,

Fig. 5

den schematischen Längsschnitt durch eine Fortbildung der Absaugvorrichtung gemäß Fig. 3 mit einer Bahnführung gemäß Fig. 2,

Fig. 6

den schematischen Längsschnitt durch eine Fortbildung der Absaugvorrichtung gemäß Fig. 3 mit gleicher Bahnführung,

Fig. 7

einen schematischen Längsschnitt gemäß Fig. 1 mit nochmals variierter Bahnführung,

Fig. 8

den schematischen Längsschnitt durch eine weitere Ausführungsform der Absaugvorrichtung mit einer Bahnführung gemäß Fig. 7,

Fig. 9

die perspektivische Ansicht einer Absaugvorrichtung nach ihrer ersten Ausführungsform, z.B. gemäß Fig. 1 und

Fig. 10

die perspektivische Ansicht einer Absaugvorrichtung nach ihrer zweiten Ausführungsform, z.B. gemäß Fig. 3.

The invention will be described in more detail below with reference to the attached drawings by way of example; show it

Fig. 1

3 shows the schematic longitudinal section through a guide roller or deflection roller for a material web moved through a processing machine and a suction device according to a first embodiment of the invention,

Fig. 2

a schematic longitudinal section according to Fig. 1 with varied guidance of the moving material web,

Fig. 3

a schematic longitudinal section according to Fig. 1 with another embodiment of the suction device,

Fig. 4

the schematic longitudinal section through a training of the suction according to Fig. 2 with the same web guide,

Fig. 5

the schematic longitudinal section through a training of the suction according to Fig. 3 with a web guide according to Fig. 2 .

Fig. 6

the schematic longitudinal section through a training of the suction according to Fig. 3 with the same web guide,

Fig. 7

a schematic longitudinal section according to Fig. 1 with again varied track guidance,

Fig. 8

the schematic longitudinal section through a further embodiment of the suction device with a web guide according to Fig. 7 .

Fig. 9

the perspective view of a suction device according to its first embodiment, eg according to Fig. 1 and

Fig. 10

the perspective view of a suction device according to its second embodiment, eg according to Fig. 3 ,

In Fig. 1 can be seen a guide or deflection roller 1 of a machine, not shown, with the machining of a moving material web 2 can be made, which is guided around this guide roller 1 and is moved in the direction of arrow P1. According to Fig. 1 moves the web 2 in such a direction on the guide roller 1 and away from her that both directions of movement are in their extension at an acute angle to each other. The guide roller 1 protrudes with its circumference to a part from below into the housing 3 of a suction device, so that this housing 3 comprises the guide roller 1 as a hood from above to a part. For this purpose, the housing 3 on its underside an opening 4, which extends over the entire width of the guide roller 1 and the web 2 and whose length in the direction of movement of the web 2 on the other hand is so great that the length determining edges 5, 6 (see also FIGS. 9 and 10 ) keep a small distance to the peripheral surface of the guide roller 1 or to the guided around the guide roller 1 web 2. Next, the housing 3 has a likewise over the entire width of the guide roller 1 or the web 2 extending air supply channel 7 and this opposite a likewise extending over the entire width of the guide roller 1 or web 2 Luftabfuhrkanal 8. In the embodiment according to Fig. 1 the clear width of the air discharge channel 8 together with its air outlet opening 10 is significantly larger, even many times larger than that of the air supply channel 7 together with its air inlet opening 9. Between the air supply channel 7 and the air discharge channel 8, the wall 3 'of the housing 3 approaches the peripheral surface of the guide roller 4 so far that it forms a narrow Luftdurchströmkanal 11 together with her.

While the web 2 is moved in the direction of the arrows P1 around the guide roller 1 and performed on it, air is blown from an air pressure device through the air supply channel 7 into the housing 3 of the suction device. This air impinges on the surface of the material web 2 and on the air layer lying on the material web 2, which is formed there by the movement-related, laminar flow and which leads to the processing of the material web 2 resulting particles with it. In the region of the narrow air flow channel 11, the injected air gains in speed and exits at the air discharge channel 8 with again lower flow velocity. The flow direction P2 of the injected air can be directed both in and against the direction of movement of the material web 2. For webs 2, which run slowly, the direction of the air flow is of little importance. However, it is particularly advantageous in the case of high-speed material webs 2 and increases the efficiency if the direction of the air flow is opposite to the direction of movement of the material web 2, as indicated by the arrows P1 and P2 in the figures. The air flow thus generated breaks when it hits the material web 2, lying as an air layer on the web 2, laminar flow, so that the entrained by her processing particles, taken from the introduced into the housing 3 airflow and transported away through the air discharge channel 8 and For example, a filter system and a collecting device can be supplied.

The arrangement of the suction device or the housing 3 as a hood over a guide or guide roller 1 is particularly advantageous and actually necessary for a good effect of the device, because this ensures that the course of the material web 2 is fixed, they can not flutter; the flow parameters remain the same regardless of the speed of movement of the web 2. In addition, it is achieved that the air introduced through the air supply channel 7 in a favorable, the intended effect, namely the breaking of the laminar flow, supporting angle to the web 2 hits. This angle can approximate a right angle or be a right angle (see also Fig. 7 and 8th ). By the housing 3, a part of the guide roller 1 hood-like surrounds and the wall 3 'of the housing 3 of the peripheral surface of the guide roller 1 is approximated, in the direction of movement of the web 2 longitudinally extending Luftdurchströmkanal 11 is formed, in which the separated from the material web 2 processing particles are exposed to the air flow over a longer distance and thus can be removed more effectively than with a single-acting suction device.

The embodiment according to Fig. 2 largely corresponds to the according Fig. 1 with the difference that the direction of movement of the material web 2 tapered onto the guide roll 1 and the direction of movement of the material web 2 running away from the guide roll 1 form a right angle in their extensions; Thus, the web 2 is on a shorter portion on the guide roller 1 and holds here when entering the housing 3 a distance from the peripheral surface of the guide roller 1, which is why the opening 4 of the housing 3 must be extended accordingly and the edge 6 of the opening 4 close lies in front of the material web 2.

According to Fig. 1 the air discharge channel 8 is formed further than the air supply channel 7. This causes the air flowing through the air passage 11 at relatively high speed to be slowed down and expanded again while being pushed upwards. As a result, particles that are still on the material web 2 in this area can be lifted off, they land in the air flow and are transported away.

However, the expanded air discharge channel 8 can also have the consequence that because of the slowed flow velocity of the air, entrained therein particles drop prematurely and accumulate within or on the bottom of the air discharge channel 8. This can be avoided if according to the embodiment according to Fig. 3 the air discharge channel 8 is not extended, but its inside diameter, for example, is equal to the air supply channel 7. Thus, a slowdown of the air flow in the air discharge channel 8 is avoided and the particles that are in the air stream are taken safely.

Fig. 4 shows a development of the embodiment according to Fig. 2 consisting in the narrow air flow passage 11 between the peripheral surface of the guide roller 1 and the guided around the guide roller 1 web 2 and the wall 3 'of the housing 3 on the inside of a so-called vortex point 12 is provided; This may be a directed into the air passage 11 projection 12 or a recess or the like .. Such a vortex point 12 causes the air flow is swirled in the air flow passage 11 and is brought closer to the surface of the material web 2 with higher energy, whereby the particles located in the laminar flow over the material web surface even safer dissolved and removed. In this embodiment, the inside width is of the air discharge channel 8 in turn larger than that of the air supply channel 7.

According to Fig. 5 two vortex points 12 are provided in the air passage 11 on the housing inner wall, in order to increase the effect of turbulence in the air flow yet and make it more effective. The clear width of the air discharge channel 8 is equal to that of the air supply channel 7 selected here. The web guide corresponds to the according Fig. 2 ,

Fig. 6 shows an embodiment with only one fluidized point 12 in the air flow passage 11 with a web guide according to Fig. 1 It should thus be made clear that one is very free in the choice of the individual features of the invention and their combination with each other in order to adapt the device to different conditions and specifications can ,

Fig. 7 shows the device according to Fig. 1 with extended air discharge channel 8 but with a different guidance of the material web 2. The tapered roll 1 on the material web 2 and the material web 2 running away from it are guided parallel to each other. Fig. 8 shows an embodiment with also parallel web guide, a housing 3 with an air supply channel 7 and an air discharge channel 8 of equal width and with two swirl points 12 on the housing inner wall in the air passage 11. As a result of the parallel guidance of the web 2, the supplied air flow can actually at right angles impact on the material web 2 or lying on it, laminar flow, which increases its intended effect.

Fig. 9 shows a perspective view of the embodiment according to Fig. 1 , With her again in the longitudinal direction, ie, in the direction of movement of a material web, not shown, through the edges 5 and 6 limited opening 4 in the bottom of the housing 3 illustrates, through which the guide roller 1 protrudes into the housing 3 and the air passageway 11 forms with the opposite housing wall. The air discharge channel 8 is extended relative to the air supply channel 7.

Fig. 10 shows a perspective view of the embodiment according to another angle Fig. 3 , Air supply channel 7 and air discharge channel 8 have the same inside diameter. Again, it should be made clear how the opening 4 in the bottom of the housing 3 in its length and thus at the same time in the direction of movement of a material web, not shown bounded by the edges 5 and 6 and these edges 5 and 6 hold only small distance to the lateral surface of the Guide roller 1 and the web 2.

LIST OF REFERENCE NUMBERS

1

sheave

2

web

3

Housing, 3 'wall

4

opening

5

edge

6

edge

7

Air supply duct

8th

Air discharge duct

9

Air inlet opening

10

Air outlet opening

11

air flow channel

12

eddy point

P1

Direction of movement of the material web

P2

Direction of movement of the air flow

Claims (6)

1. Suction-extraction apparatus which is provided as an additional apparatus for an apparatus for carrying out machining work on moving material webs and is intended for removing particles which arise during such machining work, it being the case that, during such machining work, the material web is guided around at least one directing or deflecting roller, or is guided over the roller in close contact therewith, and that the suction-extraction apparatus is arranged in the region of such a directing or deflecting roller, and, located opposite one another as seen in the longitudinal or conveying direction of the material web, has an air-feed channel and an air-discharge channel which are connected to one another, at a distance from the lateral surface of the directing or deflecting roller and from the material web, by a directing surface which is a copy of the lateral surface of the directing or deflecting roller, with the result that an air-throughflow channel is formed between this directing surface and the lateral surface of the directing or deflecting roller,
   characterized
   in that the suction-extraction apparatus has a housing (3) which encloses the directing or deflecting roller (1) during use at least partially in a shroud-like manner, this housing (3) having, on its underside, an opening (4) which extends over the entire width of the directing or deflecting roller (1) and through which the directing or deflecting roller (1) projects into the housing (3), in that this opening (4) is bounded in the longitudinal direction, which is defined by the movement of the material web (2), by edges (5, 6) which are not spaced very far apart from the lateral surface of the directing or deflecting roller (1) and/or from the surface of the material web (2), and in that the air-throughflow channel (11) is formed by the wall (3') of the housing (3), between the air-feed channel (7) and air-discharge channel (8), being in close proximity to the circumferential surface of the directing or deflecting roller (1).
2. Suction-extraction apparatus according to Claim 1, characterized in that the inside width of the air-discharge channel (8) is greater than the inside width of the air-feed channel (7).
3. Suction-extraction apparatus according to Claim 1, characterized in that, during use, the air-feed channel (7) and the air-discharge channel (8) extend over the entire width of the directing or deflecting roller (1).
4. Suction-extraction apparatus according to Claim 1, characterized in that at least one vortexing point (12) is provided on the inner wall of the air-throughflow channel (11), between the air-feed channel (7) and air-discharge channel (8).
5. Suction-extraction apparatus according to Claim 4, characterized in that the vortexing point or points (12) is or are formed by protrusions or recesses in the housing wall.
6. Suction-extraction apparatus according to Claim 1, characterized in that, during use, the air stream in the air-feed channel (7) is directed at right angles, or more or less at right angles, onto the material web (2) .

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