DE102019107451A1 - Supply of negative pressure - Google Patents

Abstract

The invention relates to a device (8) for supplying negative pressure to suction devices (6) which are rotatably mounted about a central axis (16) of a frame (25), comprising at least one connection means (50, 50 ', 50 ") for connection a vacuum source and at least one recess (46, 47, 48) for supplying the suction devices (6) with vacuum, the device (8) being displaceable in the circumferential direction relative to the central axis (16) of the frame (25) in order to supply the vacuum supply adjust a transport speed.

Description

The present invention relates to a device, a system and a method for supplying negative pressure.

In the area of the production of paper bags, a rotary feeder is used to separate paper tubes from a tube package. For separation, the suction devices, which are mounted so as to rotate about a central axis of a frame, are supplied with negative pressure. The hose located at the bottom of a hose package is captured by the suction devices in the transport process mentioned and then fed to a discharge system in a rotational movement. Due to the structurally complex structure of a rotary feeder or similar transport devices in the area of hose transport machines, in particular floor layers, correct alignment and coordination between the feed and discharge processes is always critical. In particular in the case of changing transport speeds of a transport device in the form of a rotary feeder or the like, it is necessary to take into account a different orientation or coordination between the feed and discharge processes. For example, at low transport speeds, it is advantageous to activate the vacuum for suction only shortly before the suction devices reach a piece of hose, so that advantageously only a little “false air” is drawn. Likewise, if the transport speed is low, a hose is also fixed longer using the suction devices, so that there is sufficient time for subsequent ventilation for transfer to a discharge system.

At high transport speeds, on the other hand, it is advantageous to switch the vacuum for suction earlier, so that it is ensured that there is sufficient vacuum as soon as the suction devices come into contact with the tube pieces. Furthermore, it is advantageous if the vacuum is released early enough in the area of the transfer to a discharge system, so that a secure transfer of hose pieces is also guaranteed.

In particular with changing transport speeds, there are therefore frequent suction failures, which either result in lower productivity or, in the worst case, a complete system failure if compressions occur in the conveyor system.

The object of the invention is therefore to propose a device or a system for the transport of hose pieces which ensures reliable and fail-safe transport even at different transport speeds.

The above object is achieved by a device with the features of the independent device claim, a system with the features of the independent system claim and by a method with the features of the independent method claim. Further features and details of the invention emerge from the respective subclaims, the description and the drawings. Features and details that are described in connection with the device according to the invention also apply, of course, also in connection with the system according to the invention and the method according to the invention, and vice versa, so that with respect to the disclosure of the individual aspects of the invention, reference is always or can be made to one another ,

According to the invention, a device for supplying negative pressure to suction devices is provided which is rotatably mounted about a central axis of a frame. The device in this case comprises at least one connection means for connecting a vacuum source and at least one recess, in particular an opening for supplying the suction devices with vacuum. It is further provided according to the invention that the device can be mounted so as to be displaceable in the circumferential direction relative to the central axis of the frame in order to adapt the vacuum supply to a transport speed.

An important advantage of the invention is that even with different transport speeds of transport devices or transport systems, in particular in the area of separating paper tubes, a safe transport, especially a safe and reliable takeover and transfer of tube pieces, is guaranteed. This not only reduces the risk of incorrect suction, but also the risk of compression in the conveyor system, which can lead to a complete failure of a transport system. Furthermore, the improved suction behavior also enables higher productivity when separating paper tubes. In addition to an adaptation to a transport speed, the invention also enables adaptation to other parameters, such as, for example, a hose size or a hose format.

The present device for supplying negative pressure can preferably be used in a transport device for the transport of hose pieces, in particular in a rotary feeder. Such a rotary feeder can be used in particular for the transportation of Paper tubes or pieces of paper tube are used. Likewise, a rotary feeder, comprising an objective device for supplying negative pressure, can also be used to convey plastic hoses, fabric hoses, rubber hoses and the like.

The suction devices acted upon or evacuated with suction air according to the invention can be formed in the present case in particular in the form of suction nozzles or the like. The suction devices are preferably arranged in an axial row. In this case, the suction devices can preferably be arranged on suction rolls rotating around a central shaft in a planetary manner, which can themselves be supported on the basis of disks arranged at a distance from one another. A plurality of suction devices, preferably six, in particular eight, suction devices can in particular be arranged next to one another and can be supplied with negative pressure by the device in question for supplying negative pressure.

With a view to adapting the positioning of the device according to the invention to a current transport speed as flexibly as possible, it can be provided according to the invention that a mounting of the device which is displaceable in the circumferential direction to the central axis of a frame is provided in two opposite directions. A shift in a first direction a can preferably take place within a first shift range A and in a second direction b preferably within a second shift range B. The different areas A and B can be of the same size or of different sizes. The device in question can be shifted at least 5 °, preferably at least 10 °, in particular more than 15 °, from the starting position. For example, a maximum shift of approximately 35 ° can be provided. The individual areas can be shifted around the central axis in steps or continuously in the circumferential direction.

In the context of setting the object device for supplying negative pressure as conveniently as possible, a controllable, in particular an adjustable, displaceable mounting of the device according to the invention can preferably be provided. In this context, an automatic controllability or regulatability of a displaceable bearing can be provided in the context of the most comfortable and simple usability. It is conceivable here for the device in question to be shifted stepwise or continuously in the circumferential direction about a central axis. Here, the displaceable mounting according to the invention can be actuated in various ways, for example electrically, pneumatically, magnetically or via a friction clutch or the like, the actuation in particular being able to be automated.

In addition to a bearing that can be displaced in the circumferential direction to the central axis of the frame, a bearing that can be displaced axially to the central axis of the frame can also be provided within the scope of the invention, which in particular allows great flexibility with regard to the size and format of hose pieces transported by means of the device in question.

In order to be able to guarantee a vacuum supply in a structurally simple but at the same time as flexible as possible, it is advantageously provided according to the invention that at least two, preferably three, in particular groove-like recesses are arranged within the device for supplying vacuum. As an alternative to an arrangement of three groove-like recesses, only one or two or even more than three preferably groove-like recesses can also be provided. The recesses can also have any other possible shape and can be arranged, for example, at least partially one above the other or on top of one another. Between the recesses, web-like intermediate elements are preferably provided, which briefly interrupt a vacuum supply during operation of the transport device and separate the recesses from one another. The web-like intermediate elements can also be variable in size and, in particular, can be made adjustable in terms of their positioning.

In order to enable as simple and quick evacuation as possible of the preferably groove-like recesses, the device according to the invention for supplying negative pressure can have at least two, preferably three connecting means for connecting a negative pressure source, the connecting means preferably being formed as connecting pieces. Here, of the preferably three groove-like recesses, either all three can be supplied with negative pressure via the same negative pressure source or each have a separate pump for supplying negative pressure. It can also be provided that only one recess is supplied with a separate vacuum source, while two or more further recesses are pumped with a single, in this case preferably more powerful, vacuum source.

As part of a particularly flexible adaptation of the positioning of the device for supplying negative pressure to a current transport speed, it can also be provided that the device is formed in two parts is and has a first and a second part, both of which can be slidably supported in the circumferential direction to the central axis of the frame, in particular can be slidably supported independently of one another in the circumferential direction to the central axis of the frame. In addition to a two-part construction, a three, four or more than four-part construction is also conceivable.

In the context of a two-part device, with regard to the greatest possible flexibility in adapting the positioning of the device to a current transport speed, it can in particular be provided that the two parts of the two-part device simultaneously in the circumferential direction to the central axis of the frame, in particular in two opposite directions a and b can be slidably storable. Here, a displacement in the first direction a can preferably take place within a first displacement region A and in the second direction b within a second displacement region B. The displacement areas can also be the same size or different sizes. A shift can be in particular by at least 5 °, preferably by at least 10 °, in particular by more than 15 °, with respect to the basic orientation, it being possible for a shift to be gradual or continuous. For example, a maximum of 35 ° can be provided.

The invention also relates to a system for supplying negative pressure with the features of the independent system claim. Here, the system in question comprises the above-described device for supplying negative pressure, a frame comprising a central axis and suction devices mounted rotatably about the central axis of the frame.

Furthermore, the system in question can also have a control device, preferably a control disk, which is arranged in particular on the central axis of the frame and is rotatably mounted about this axis.

It can preferably be provided in the context of the invention that the control disk of the system in question has suction air bores, which are preferably arranged in the form of a concentric circle on the control disk. In addition to continuous drilled recesses, perforated, punched, milled, sawn or countersunk continuous recesses can also be provided in the control disk according to the invention. In addition to an arrangement of suction air bores or other types of recesses, the control disk is preferably arranged on the device for supplying negative pressure in such a way that a connection between an evacuated recess of the device and a suction device can be established at regular intervals during rotation of the control disk about the central axis. Here, the control disk is preferably immediate, i.e. arranged in direct contact with the device according to the invention, so that the device or the preferably groove-like recesses are sealed off from the outside by the control disk. The suction air bores arranged within the control disk, preferably in the form of concentric circles, make it possible for a rotation of the control disk to produce a connection between a suction device connected to the suction air bores and a recess arranged in the device in question at regular time intervals.

In order to ensure as wide an overlap as possible or a simple and flexible overlap of the device for supplying negative pressure with the control disk or with the suction air bores of the control disk, it is objectively proposed that the device for supplying negative pressure is formed in a partially circular manner, the circumference of the pitch circle is at least 0.78 rad, preferably at least 1.04 rad, in particular at least 1.57 rad of the circumference of the control disk.

With regard to an automatically controllable or automatically adjustable adjustment of the positioning of the device in question to a current machine or transport speed, it can further be provided according to the invention that the device can be displaceably supported in such a way that when the control disk rotates about the central axis of the The point in time can be determined when a suction air bore arranged in the control disk is closed and a subsequent suction air bore has run into a recess in the device for supplying negative pressure.

In order to ensure continuous evacuation, it can further be provided according to the invention that at least one vacuum source is provided. A vacuum source can in particular be formed by a pump. Various possible pump types can be used here as a possible pump, which can be varied depending on the material to be transported or the size and format of the material. For example, rotary vane pumps, root pumps, turbomolecular pumps, oil diffusion pumps, scroll pumps or the like can be used for the vacuum supply. In this case, each recess can be supplied with a separate vacuum source or, alternatively, individual sub-areas can be supplied with a common pump.

In addition to the arrangement of a vacuum source, the arrangement of a compressed air source can also be provided according to the invention. The arrangement of a compressed air source is particularly advantageous in order to ensure error-free discharge of a transported hose section to a discharge unit, by briefly applying compressed air to the hose section being sucked in and thus transferring it to the discharge unit. In this way, compression in the transport system can be prevented, which in the worst case can lead to a complete system failure. In addition to the application of compressed air, it can also be sufficient in the context of a structurally simple and inexpensive variant if, instead of the application of compressed air, access to the atmosphere is opened.

With regard to an automated adaptation of the positioning of the device according to the invention to a current transport speed, it can further be advantageously provided that the system in question is a detection unit for recording data for determining a transport speed, and a processing unit for determining a target position of the device the determined transport speed and a control unit for changing the position of the device for supplying negative pressure. It can preferably be provided in the context of the invention that the detection unit has at least one sensor for recording data, by means of which a transport speed can be determined. The sensor can, for example, detect the current currently tapped from the means of transport, a current moment or other specific data from which a current transport speed can be determined. The transport speed to be determined can preferably be a speed of transported tube pieces. With regard to a compact and easily interchangeable and integrable design, it can be particularly advantageous here if the system components are arranged in the inventive device for supplying negative pressure. Alternatively, the aforementioned system components of a detection unit, a processing unit and a control unit can also be arranged remotely from the device and preferably integrated into a control unit or the like.

Furthermore, within the scope of an exact determination of a current transport speed, provision can also be made for the current transport speed to be determined on the basis of a plurality of sensors, the data recorded before a current transport speed is determined by means of a processing unit and averaged and / or weighted accordingly and / or other statistical evaluation methods is subjected.

For smooth control and communication of the individual system components with one another, the components can be connected to one another in the context of a wired version, preferably by means of a communication and control line. With regard to particularly flexible, uncomplicated and efficient communication of the individual system units, the individual system components can preferably communicate with one another wirelessly or contactlessly on a server or cloud basis and / or via the Internet. For energy-efficient operation, the system can also be formed as a learning unit and change parameters on the basis of collected data and empirical values and thus adapt the operation.

With regard to a system that is as flexible as possible, it can further be provided according to the invention that the system has at least one feed unit for feeding individual hose pieces and / or at least one discharge unit for removing hose pieces. It can be provided in the context of a particularly fail-safe system that additional control and / or alignment units for checking and / or aligning the transported tube pieces are arranged on the feed and / or discharge unit. The feed unit can in particular be formed in the form of a stack magazine. The discharge unit, however, can preferably be designed as a delivery station and / or as a double belt conveyor.

The invention also relates to rotary feeders, comprising an objective device for supplying negative pressure, in particular an objective system for supplying negative pressure.

Furthermore, a method for supplying negative pressure with the features of the independent method claim is also protected here. Here, the subject method for supplying negative pressure comprises in particular the steps of detecting a current transport speed, determining a target position of a device for supplying negative pressure on the basis of the detected transport speed by means of a processing unit, and adapting a target position of the device for supplying Negative pressure on the basis of the determined target position by means of a control unit, the target position being adjusted by means of a displacement of the device for supplying negative pressure which is carried out in the circumferential direction. The method according to the invention thus brings with it the same advantages as already detailed in relation to the device according to the invention have been described.

The detection of a current transport speed according to the invention can preferably be carried out by means of a detection unit, which can in particular have sensors for recording data of a current transport speed.

The displacement of the device for supplying negative pressure in the circumferential direction can preferably take place in one direction. Alternatively, in the context of a two-part device for supplying negative pressure, a circumferential displacement in two mutually opposite directions can advantageously also be provided, which in particular can also take place simultaneously.

In order to carry out the method in question as efficiently as possible, it can further be provided according to the invention that the method includes a compressed air supply in addition to a vacuum supply, in particular with regard to a safe transfer of transported hose pieces.

Further advantages Features and details of the invention result from the following description, in which exemplary embodiments of the invention are described in detail with reference to the drawings. The features mentioned in the claims and in the description can each be essential to the invention individually or in any combination.

• 1 eine schematische Darstellung einer Seitenansicht einer Transportvorrichtung zum Transport von Schlauchstücken,
• 2 eine schematische Darstellung einer Schnittansicht der Transportvorrichtung zum Transport von Schlauchstücken aus 1 gemäß einem Schnitt entlang der Linie II-II,
• 3 eine schematische Darstellung einer Schnittansicht der Transportvorrichtung zum Transport von Schlauchstücken aus 2 gemäß einem Schnitt entlang der Linie III-III, umfassend eine erfindungsgemäße Vorrichtung zur Zuführung von Unterdruck gemäß einem ersten Ausführungsbeispiel sowie ein erfindungsgemäßes System zur Zuführung von Unterdruck,
• 4 eine schematische Darstellung der erfindungsgemäßen Vorrichtung zur Zuführung von Unterdruck gemäß einem ersten Ausführungsbeispiel in einer ersten Positionierung,
• 5 eine schematische Darstellung der erfindungsgemäßen Vorrichtung zur Zuführung von Unterdruck gemäß einem ersten Ausführungsbeispiel in einer zweiten Positionierung,
• 6 eine schematische Darstellung der erfindungsgemäßen Vorrichtung zur Zuführung von Unterdruck gemäß einem zweiten Ausführungsbeispiel.

The figures show:

• 1 1 shows a schematic illustration of a side view of a transport device for transporting pieces of hose,
• 2 is a schematic representation of a sectional view of the transport device for transporting pieces of hose 1 according to a cut along the line II - II .
• 3 is a schematic representation of a sectional view of the transport device for transporting pieces of hose 2 according to a cut along the line III - III comprising an inventive device for supplying negative pressure according to a first exemplary embodiment and an inventive system for supplying negative pressure,
• 4 2 shows a schematic representation of the device according to the invention for supplying negative pressure according to a first exemplary embodiment in a first positioning,
• 5 1 shows a schematic representation of the device according to the invention for supplying negative pressure according to a first exemplary embodiment in a second positioning,
• 6 is a schematic representation of the inventive device for supplying negative pressure according to a second embodiment.

1 shows a schematic representation of a side view of a transport device formed in the form of a rotary feeder 2 for transporting pieces of hose 10 , The rotary feeder has a total of eight suction rolls 4 on whose waves 18 at the same radial distance from the central axis 16 are stored. The entire rotary feeder rotates clockwise during operation, whereas the individual suction rolls 4 rotate counterclockwise. Here, the individual suction rolls 4 , several suction devices preferably arranged next to one another 6 by means of which the on a stack magazine 9 stacked pieces of hose 10 can be sucked in or taken over to a discharge device formed here in the form of a double belt conveyor 14 to be handed over.

2 shows a schematic representation of a sectional view of the transport device 2 for transporting pieces of hose 10 out 1 according to a section along the line II-II. The transport device 2 includes one from a first side part 24 and a second side part 26 formed frame 25 as well as one inside the rack 25 arranged central axis 16 , Furthermore, the transport device 2 one on the central axis 16 arranged first and second control disk 20 . 22 on the operation of the transport device around the central axis 16 rotate. Between the first and second control disks 20 . 22 are the described eight suction rolls 4 arranged in the form of a concentric circle. The suction rolls 4 carry a number of side by side on the roller shafts 18 of the suction rolls 4 arranged suction devices 6 , Immediately on the disc 20 is the device according to the invention for supplying negative pressure 8th arranged. The device 8th is formed in the form of a part-circular disc and is over the between the device 8th and the side part 24 of the frame 25 arranged bolt 32 firmly on the control disc 20 pressed so that the device 8th and the control disc 20 are in contact with one another on the contact surface and are sealed to one another to the outside. To do this is inside the bolt 32 a feather 34 arranged which applies the necessary contact pressure via its spring force. Furthermore, the device 8th a connecting piece 50 to connect a vacuum source to the device 8th supplied with the necessary pumping power and the inside of the device 8th arranged recesses 46 . 47 . 48 evacuated. Over inside the control disc 20 arranged suction air holes 12 as well as within the roller shafts 18 arranged channel 28 become the suction devices 6 supplied with vacuum by the suction air holes 12 at certain times during a rotation of the control disc 20 aligned with those within the device 8th arranged recesses 46 . 47 . 48 be associated. On this, during a rotation of the control disc 20 Connection formed at certain times between the suction devices 6 and the device 8th , the suction devices 6 at certain times during a rotation of the control disc 20 a vacuum supply is provided.

3 shows a schematic representation of a sectional view of the transport device 2 for transporting pieces of hose 10 out 2 according to a cut along the line III - III , comprising a device according to the invention 8th for supplying negative pressure according to a first embodiment and a system according to the invention for supplying negative pressure. The device according to the invention formed in the form of a partial circle in the present case 8th for supplying negative pressure here comprises three connecting pieces 50 . 50` and 50 " for connecting one or more vacuum sources as well as three groove-like recesses arranged side by side in the present case 46 . 47 and 48 , In addition to a separate supply of the three groove-like recesses 46 . 47 . 48 With suction air via a separate vacuum source, the individual recesses can 46 . 47 . 48 can also be supplied at least partially via the same vacuum source. According to the present illustration behind the device 8th arranged control disc 20 is in operation of the transport device 2 contacting and sealing to the outside in a clockwise direction on the device 8th past. Here is the device 8th formed axially displaceable, so that a contact pressure on the control disc 20 can be built up, an outwardly sealing arrangement between the device 8th and the control disc 20 guaranteed. Between the groove-like recesses 46 . 47 and 48 are also web-shaped intermediate elements 49 provided in the operation of the transport device 2 briefly interrupt a vacuum supply and the recesses 46 . 47 and 48 separate from each other. The web-like intermediate elements 49 can also be variable in size and, in particular, adjustable in terms of their positioning. As an alternative to an arrangement of three groove-like recesses 46 . 47 . 48 can also have only one or two or more than three groove-like recesses 46 . 47 . 48 be provided. The recesses 46 . 47 and 48 can also have other shapes and, for example, at least partially arranged one above the other.

During the operation of the transport device 2 the control disc turns 20 clockwise on the device 8th past. By connecting vacuum sources to the connecting piece 50 . 50 ' . 50 " become the groove-like recesses 46 . 47 . 48 continuously evacuated. As soon as one of the suction air holes arranged in the form of a concentric circle 12 during the rotation of the control disc 20 with one of the groove-like recesses 46 . 47 . 48 is at least partially matched across the channel 28 with the suction air holes 12 connected suction devices 6 evacuated so that the transport process can begin by sucking in a hose. Because the control disc 20 rotates at different speeds at different transport speeds, can during the operation of the transport device 2 incorrect suction occurs, namely when the vacuum required to suction a piece of hose 10 has not yet been reached before the suction devices 6 over a piece of hose 10 be performed.

In order to variably adapt the time to build up the negative pressure required for suction to the corresponding transport speed, the invention provides that the device for supplying negative pressure in the circumferential direction about the central axis 16 in the directions a and b is slidably storable. By moving the device 8th in the direction a, at least along parts of the area A, it is achieved in particular that suction within a transport cycle begins earlier, so that the vacuum required to suck in a piece of hose 10 has also been reached earlier. A displacement of the slidably mountable device 8th in the direction a is thus provided in particular at higher transport speeds.

Likewise, at slower transport speeds, the displaceably mountable device can be displaced 8th in direction b, at least along parts of surface B. Due to the slower transport speed, a shorter path is sufficient to get the necessary vacuum to suck in a piece of hose 10 to reach. Here it is more important to ensure that the negative pressure does not drop too early, so that a hose is released during the transport process before it is discharged 14 reached. This would compress a tube 10 within the system, which can lead to a complete system failure. By moving the device 8th in direction b along the surface B is thus achieved that the hose pieces 10 be held longer so that a safe Handover to a corresponding discharge device 14 can be done.

To guide a suctioned piece of hose 10 To simplify further is within the device 8th , directly adjacent to the recess 48 also a compressed air supply 52 arranged. The compressed air supply 52 can either be a device for supplying excess pressure or, in the simplest case, also an access to the atmosphere. Due to the pressure difference from - before reaching the compressed air supply 52 - Part of the suction devices still evacuated 6 rapid evacuation of the negative pressure is guaranteed, so that a safe transfer of the transported hose pieces 10 can be done.

In addition to manual alignment of the present system, in which the device 8th for supplying negative pressure, preferably before carrying out a specific production cycle, correspondingly in its position in the circumferential direction to the central axis 16 is shifted, a shift can also be regulated automatically. For this purpose, there is in particular a detection unit in the present system 54 , comprising a sensor 54` a processing unit for collecting data for determining a transport speed 56 for determining a target position of the device 8th based on the determined transport speed as well as a control unit 58 to change the position of the device 8th provided, preferably via a communication and control line 59 are interconnected. The detection unit can be integrated into a unit that can be easily integrated and retrofitted 54 , the processing unit 56 and the control unit 58 here in particular within the device 8th be arranged. As an alternative to a wired supply and communication, the individual system components can also communicate wirelessly or contactlessly with each other via Bluetooth, WLAN, NFC, Zigbee or the like and therefore not via a communication and control line 59 be connected.

In the context of such an automatic control or regulation, a change in the transport speed of the present system can be recognized in a simple manner, whereupon the desired position of the device 8th can be adapted accordingly to both a safe takeover and a safe transfer of hose pieces 10 to ensure. Alternatively, the mentioned system components of a detection unit 54 , a processing unit 56 and a control unit 58 also removed from the device 8th arranged and preferably integrated into a control unit or the like.

4 shows a schematic representation of the device according to the invention 8th for supplying negative pressure according to a first embodiment in a first positioning in which the device 8th contrary to their orientation 3 35 ° in the circumferential direction around the central axis 16 has been moved counterclockwise in direction a. This position is advantageously provided for high transport speeds, so that by (in relation to the orientation according to 3 ) earlier evacuation, the negative pressure required for hose transfer is guaranteed despite the high transport speed. Alternatively, as is not explicitly shown here, automation can also be used to adapt the position of the device 8th to a transport speed, a detection unit 54 , a processing unit 56 as well as a control unit 58 be provided.

With regard to evacuation of the groove-like recesses 46 . 47 and 48 it can also be provided that at least two or all three groove-like recesses are evacuated via the same vacuum source. For example, it can also be provided that only the first groove-like recess 46 is evacuated by means of a separate vacuum source, while the groove-like recesses 47 and 48 be pumped through the same vacuum source.

5 shows a schematic representation of the device according to the invention 8th for supplying negative pressure according to a first embodiment in a second positioning in which the device 8th in contrast to the basic positioning according to 3 35 ° in the circumferential direction around the central axis 16 has been moved clockwise in direction b. Such an arrangement is particularly suitable for slow transport speeds, since evacuation is not critical here due to the low transport speed. However, this arrangement ensures that the piece of hose in question 10 even safely at the discharge unit even at low transport speeds 14 can be handed over. Again, with regard to an automated adjustment of the positioning of the device 8th to the transport speed of a detection unit, not shown here 54 , a processing unit 56 and a control unit 58 be provided.

6 finally shows a schematic representation of the inventive device for supplying negative pressure 8th according to a second embodiment. According to the second embodiment, the device 8th formed in two parts and comprises a first part 8a and one of them through a web-like intermediate element 49 separate second part 8b , Here, the two parts 8a and 8b independently of each other along directions a and b within surfaces A and B in the circumferential direction to the central axis 16 be moved. The individual parts can be made as flexible and variable as possible 8a and 8b are each supplied by a separate vacuum source. In part 8b is in contrast to part 8a one also in the one-piece form of the device according to the invention 8th Compressed air supply provided for the safe transfer of the hose pieces taken over 10 to a discharge unit 14 arranged. As part of an automatable embodiment of the present exemplary embodiment, a detection unit can also be used here 54 , a processing unit 56 as well as a control unit 58 be provided. In the context of the present two-part device, the individual system components 54 . 56 . 58 in this case advantageously in each part 8a and 8b be provided. By means of this two-part form of the device provided according to the second exemplary embodiment 8th can in particular be even more flexible and faster on changes in the transport speed of the transport device 2 be reacted to.

By the device according to the invention 8th or the system according to the invention, it is possible to vary the location and thus also the time of the evacuation of the suction devices in question on the basis of the current transport speed of a transport device 2 to control and thus prevent both false suction and compression in the conveyor system, which provides a more reliable and fail-safe transport system.

LIST OF REFERENCE NUMBERS

2

Device for transporting pieces of hose

4

suction rolls

6

suction devices

8th

Device for supplying negative pressure

8a

first part

8b

second part

9

feed

10

hose Connector

12

Saugluftbohrung

14

discharge unit

16

central axis

18

roller shafts

20

first control disc

22

second control disc

24

first side part

25

frame

26

second side part

28

channel

32

bolt

34

feather

46

Vacuum supply

47

Vacuum supply

48

Vacuum supply

49

intermediate element

50

connection means

50`

connection means

50 "

connection means

52

Air Supply

54

detection unit

54`

sensor

56

processing unit

58

control unit

59

Communication and control line

FROM

displacement range

from

displacement direction

Claims (18)

Device (8) for supplying vacuum to suction devices (6), which are mounted rotatably about a central axis (16) of a frame (25), comprising at least one connection means (50, 50 ', 50 ") for connecting a vacuum source and at least a recess (46, 47, 48) for supplying the suction devices (6) with negative pressure, characterized in that the device (8) can be displaceably supported in the circumferential direction relative to the central axis (16) of the frame (25) in order to supply the negative pressure to a Adjust transport speed. Device (8) after Claim 1 , characterized in that in addition to a bearing which is displaceable in the circumferential direction to the central axis (16) of the frame (25), a bearing which is axially displaceable to the central axis (16) of the frame (25) is also provided. Device (8) after Claim 1 or 2 , characterized in that there is provided a mounting of the device (8) which can be displaced in the circumferential direction to the central axis (16) of the frame (25) in two opposite directions (a, b), a displacement into the first Direction (a) can take place within a first displacement range (A) and in the second direction (b) within a second displacement range (B). Device (8) according to one of the preceding claims, characterized in that a controllable, preferably adjustable, displaceable mounting of the device (8) is provided in the circumferential direction to the central axis (16) of the frame (25). Device (8) according to one of the preceding claims, characterized in that at least two, preferably three, in particular groove-like recesses (46, 47, 48) are arranged within the device (8), the recesses preferably being formed by web-like intermediate elements (49) are separated from each other. Device (8) according to one of the preceding claims, characterized in that at least two, preferably three connection means (50, 50 ', 50 ") are provided for connecting a vacuum source, the connection means (50, 50`, 50") being in particular as Connection pieces are formed. Device (8) according to one of the preceding claims, characterized in that the device (8) is formed in two parts and has a first and a second part (8a, 8b), both of which are circumferential to the central axis (16) of the frame (25 ) can be slidably supported, in particular can be slidably supported independently of one another in the circumferential direction to the central axis (16) of the frame (25). Device (8) after Claim 7 , characterized in that the two parts (8a, 8b) of the two-part device (8) can be displaceably supported simultaneously in the circumferential direction to the central axis (16) of the frame (25), in particular in two opposite directions (a, b), a displacement in the first direction (a) within a first displacement region (A) and in the second direction (b) within a second displacement region (B). System for supplying vacuum, comprising - a device (8) for supplying vacuum according to one of the Claims 1 to 8th , - A frame (25) comprising a central axis (16) - and suction devices (6) rotatably mounted about the central axis (16) of the frame (25). System according to Claim 9 , characterized in that a control device, in particular a control disc (20) is provided. System according to Claim 10 , characterized in that the control disc (20) has suction air bores (12) and is arranged on the device (8) such that during the rotation of the control disc (20) about the central axis (16) a connection between an evacuated at regular intervals Part of the device (8) and the suction devices (6) can be produced. System according to Claim 10 or 11 , characterized in that the device (8) is part-circular, the circumference of the partial circle being at least 0.78 rad, preferably at least 1.04 rad, in particular at least 1.57 rad of the circumference of the control disk (20). System according to one of the Claims 10 to 12 , characterized in that the recess (46, 47, 48) arranged within the device (8) can be displaceably supported in such a way that when the control disk (20) rotates about the central axis (16), the point in time at which an in of the control disk (20) arranged suction air bore (12) is closed and a subsequent suction air bore (12) has run into the recess (46, 47, 48). System according to one of the Claims 10 to 13 , characterized in that a vacuum source and / or a compressed air supply (52) is provided. Rotary feeder, comprising a device (8) according to one of the Claims 1 to 8th , in particular a system according to one of the Claims 9 to 17 , Method for supplying negative pressure, comprising the steps: - detecting a current transport speed, - determining a desired position of a device for supplying negative pressure (8) on the basis of the detected transport speed by means of a processing unit (56), - adjusting a desired position of the Device for supplying negative pressure (8) based on the determined target position by means of a control unit (58), characterized in that - the target position is adjusted by means of a displacement of the device for supplying negative pressure (8) in the circumferential direction. Method according to Claim 19, characterized in that the recess (46, 47, 48) arranged within the device (8) is displaced in the circumferential direction in such a way that the point in time when a suction air bore (12) arranged in the control disk (20) can be determined is closed and when a subsequent suction air bore (12) runs into the recess (46, 47, 48). A method according to claim 19 or 20, characterized in that the method comprises a compressed air supply (52) in addition to a vacuum supply (46, 47, 48), in particular when tube pieces (10) are being discharged to a discharge unit (14).

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