DE102010051693A1 - Device and method for the defined picking up of sacks - Google Patents

Abstract

Pick-up device and method for the defined pick-up of flexible valve sacks with a storage device on which a sack can be arranged lying and from which the sack can be gripped and picked up individually. A positioning device with a blowing device is provided in order to position the sack to be picked up in a defined manner by means of a targeted air blast.

Description

The invention relates to a device and a method for defined picking up of sacks and in particular of flexible valve bags from a storage table, on which a bag bundle is arranged lying flat and from which a bag is individually grasped and taken to the bag, for example by means of a slip on a Put on the filler neck of a rotating packing machine.

In the prior art a variety of packaging machines have become known. Rotary packing machines have a plurality of, for example, 4, 6, 8, 10, 12 or 16 filling nozzles, onto which the valve bags to be filled are plugged with their valve during the rotational movement. Here, the valve bag is plugged targeted by a slip-on at a fixed angular position. The slip-on picks up from a bag bundle on a still unfilled valve bag and brings him to a suitable Aufsteckposition. Before the sack accelerates and is shot onto the filler neck of the packing machine, the valve bag valve must be opened in a defined manner. The term "shot" is correct insofar as the sacks have to bridge a short distance unguided the space between the slip-on and the filler neck of the packing machine.

It is important that the sacks are precisely and repeatably positioned throughout the attachment process to keep the slip rate within the desired high range. In order to achieve a high Aufsteckquote, the bags must be picked up defined and shot from a defined position on the filler neck of the packing machine.

If, for example, only one percent of the valve sacks are not attached to a filler neck, a total of 36 sacks accumulate on the ground after one hour at a filling rate of 3600 sacks / hour. In the course of a working day of 10 working hours, the total adds up to 360 sacks, unless the sacks are collected. In order not to impair the function, a regular collection is necessary. However, this numerical example also shows that in modern bottling an improvement in the Aufsteckquote of only 0.1% of z. B. 99.5% to 99.6% results in a significant reduction of not plugged bags. In this example, there would be a 20% reduction.

Often, such bags are made of paper or they have an outer layer of paper, which leads to a certain rigidity of the valve bags. As a result, such bags can be easily aligned defined on a storage table by a slider or a gripper aligns the bag bundles specifically.

In many cases, however, valve sacks are common, which do not consist of a relatively stiff material, such as paper, but consist of fabric, foil or other more flexible materials. In particular, bags made of woven or ribbon fabric are inexpensive to manufacture and such bags can have a high strength. For automatic processes, however, such sacks have the disadvantage that they have a considerably lower rigidity. Thus, the bag bundle is less alignable and in particular, the individual bag is difficult to align because a mechanical load through a slide can already lead to a drape on the bag surface and thus an undefined position of the bag. However, undefined positions in the processing of automatic bag pegs can result in a significantly reduced pegging rate that is no longer tolerable.

It is therefore the object of the present invention to provide a receiving device for the defined picking up of sacks and a corresponding method, whereby a defined positioning of the sacks is made possible even when using flexible sacks.

This object is achieved by a receiving device with the features of claim 1. The inventive method is the subject of claim 11. Preferred developments of the invention will become apparent from the dependent claims. Further advantages and characteristics of the invention are shown in the exemplary embodiment.

The receiving device according to the invention for the defined picking up of sacks and in particular of flexible valve sacks comprises a depositing device on which at least one lying sack can be arranged and from which a sack can be grasped and held individually. In this case, a positioning device is provided with at least one blowing device in order to position defined by an at least one targeted air blast the male uppermost bag at a stop.

The recording device according to the invention has many advantages, since it is suitable and intended to individually record and define the respectively to be picked upmost sack of the bag bundle. This allows a defined further processing of the bag, whereby a high reproducibility of Sackaufsteckens is made possible on a filler neck of a rotating packaging machine. The attachment rate can be significantly increased even with flexible bags, so a Fully automatic filling of various materials in such valve bags can be done.

In particular, at least one sack bundle can be laid flat on the depositing device. Advantageously, at least one sack, and in particular the uppermost sack of a sack bundle, can be gripped and held there.

The storage device is particularly preferably designed as a storage table.

In a preferred embodiment, the blowing device comprises at least one air nozzle. In particular, the blowing device comprises at least one inclined to the horizontal air nozzle, which is aligned obliquely from above toward one end of the male bag. By the obliquely directed from the top of one end of the bag air nozzle is preferably a gentle, but certain air blast spent on the end of the bag. In addition to air, other gases can be blown.

In this case, the blowing device may also comprise a plurality of spatially adjacent and / or successively and / or staggered air nozzles. The air nozzles are provided in one embodiment, in particular laterally offset. The air nozzles may be provided, for example, on a pipe or the like over the width of the sacks to be aligned. But it is also possible that one or more flat nozzles or louvers are provided to deliver the targeted air blast on the male uppermost bag of the bag bundle.

Valve bags often have a bottom seam or weld or the like that may already provide suitable resistance to the blast of air, such that the blast of air due to the additional drag from the bottom seam or protruding areas results in movement of the bag towards the stop.

The particular sewn valve bags preferably have at least one tab or the like on a side surface, wherein the bags in the bag bundle on the tray are then preferably positioned so that the tabs are each located above, so that the air shock catches under the tab and to a particularly effective drive of the bag leads in the direction of the stop. The tab may be formed as a folded end portion of the bag. For example, it is often customary to produce a valve bag by folding over an end wall two or more times and sewing it there. This regularly results in a folded end region as a tab under which such a blast of air can reach to carry the bag to its defined position.

It is also possible that at least one tab is designed or provided as a pocket. A tab or the like can also be formed by a folded-down bottom of the bag, such as a folded-down valve bottom or folded-down bottom.

In such embodiments, it does not matter whether all sacks within the sack bundle are exactly on top of each other or if there is a slight misalignment, because by the blowing device of the topmost bag is reliably transported to the stop so that a well-defined positioning takes place in the longitudinal direction of the bag.

For process safety, it is advantageous if the maximum offset of the bags is less than the length of the tab so that the air blast carries the bag over the underlying and does not catch under the flap of the underlying.

In the transverse direction of the bag, that is in the direction in which the bag is shot onto the filler neck, a sufficiently reliable positioning usually takes place via the detection of the sensor signal of a light barrier during the slip-on operation.

In all embodiments, the sacks may at least partially consist of a fabric or a ribbon fabric. In this case, the sacks may in particular be made permeable to air and have no inner or outer coating of the fabric and thus differ significantly in their properties from the paper sacks commonly used.

The storage device comprises a storage surface and a stop for one end of the bags.

The invention is also directed to a slip-on device with at least one receiving device according to at least one of the preceding claims and to a packing installation with a packing machine and a slip-on device and a receiving device, as described above.

In the method according to the invention for the defined picking up of sacks and in particular for receiving valve sacks, at least one sack is deposited on a depositing device. At least one targeted air blast is emitted by means of at least one blowing device of a positioning device in order to position the bag in a defined manner against a stop.

The method according to the invention also has many advantages, since a reliable and reproducible alignment of the individual bags is made possible.

Preferably, a bag bundle is transported to the storage device and stored there. A bag bundle has a higher stiffness than a single bag. The bag bundle can be transported by carriers on the storage device and stored there. When a sack bundle with a plurality of, in particular flat, superimposed sacks is deposited on the depositing device, in each case the uppermost sack is positioned with the targeted air blast.

The air blast is preferably directed under an overhead folded end portion or a tab provided on the side surface of the bag.

It is also possible for the puff of air to be directed from underneath below a folded-down end portion of a bag. Then a bag, in particular individually arranged on storage device is selectively positioned.

Further advantages and features of the present invention will become apparent from the embodiments, which are explained below with reference to the accompanying figures.

Show:

1 a schematic plan view of a packing plant with a packing machine and a device for attaching valve bags;

2 an overall view of the device according to the invention for attaching valve bags;

3 an enlarged detail view of the receiving device for receiving the valve bags;

4 the receiving device after 3 after gripping a valve sack;

5 the receiving device after 3 before a vertical orientation of the valve bag;

6 the receiving device after 3 after the vertical alignment of the valve bag;

7 an alternative embodiment of a receiving device;

8th the receiving device after 7 grabbing a bag;

9 the receiving device after 7 before the vertical orientation of the valve bag;

10 the receiving device after 7 with vertically aligned valve bag;

11 a valve bag in the valve opening channel of the slip-on prior to shooting;

12 a cross section through 11 at the height of the air nozzles;

13 the valve opening channel with the slip-on device just before the valve sacking;

14 a cross section through the valve opening channel at the height of the air nozzles; and

15 a plan view of a flat-lying valve bag and a cross section of the Sackumschlagendes.

With reference to the enclosed 1 - 15 In the following, some embodiments of a device according to the invention will be explained.

1 shows a highly schematic plan view of a packing plant 60 holding a rotating packing machine 1 and a slip-on device 10 as well as a discharge belt 70 includes.

The packing machine 1 is used to fill valve bags 2 and has in the illustrated embodiment, six distributed over the circumference arranged filler neck 3 on, of which five fillers 3 each valve sacks 2 are arranged.

The packing machine 1 is in the plug-on position. The angle sensor 61 had previously the Vorbeirotieren the next filler 3 in the predetermined angular position 46 recorded and thus triggered the next Aufsteckvorgang. In addition to using one of the slip-on device 10 associated sensor is also the use of an existing in the packing machine sensor possible, the predetermined angular position 46 detected.

The slip-on device 10 has a empty bag magazine here 71 and a slip-on device 20 , 2 shows in a perspective overall view of the slip-on device 10 , The empty bag magazine can be designed as empty bag cell magazine and for the automatic transport of bag bundles 5 the receiving device 30 the slip-on device 10 be suitable.

In the illustration after 2 becomes a bag-bundle 5 straight towards the as a storage table 34 trained storage facility 42 transported. The storage table 34 has a shelf space 58 on which a bag-bundle 5 can be stored. Following this, the top valve bag 2 of the sack bundle 5 from the receiving device 30 grabbed and the slip-on device 20 fed. It is also possible that the bags are pre-separated and individually on the storage device 42 or the storage table 34 be arranged and taken there.

The slip-on device 10 can also be retrofitted to existing packing machines.

The packing machine 1 is particularly suitable for filling powdery or granular substances in valve sacks 2 , The bag weight of the individual bags may vary and is in particular between about 5 and 50 kg, and preferably between 20 and 50 kg, but may also be larger or smaller depending on the application.

In 3 is an enlarged schematic representation of the receiving device 30 represented, with the defined receiving the valve bags 2 takes place, even if the valve bags are not made of a relatively rigid material, but of a flexible plastic material such as a fabric.

On the storage table 34 is a bag bundle 5 from several valve bags 2 arranged, for better understanding here, the individual valve bags 2 Placed offset in the longitudinal direction are located. This can also occur in practice, especially in the case of flexible bags, since sacks of flexible material can not be aligned as easily as is the case, for example, with bags made of paper.

The recording device 30 has a gripping device 4 , here a suction pad with several suckers arranged one behind the other 59 includes. The individual suckers 59 can be selectively switched on or off depending on the width of the valve bags to be processed and / or are arranged adjustable.

The recording device 30 furthermore has a positioning device 50 here a blower 51 includes one or more air jets 53 having. The air nozzle 53 may in principle have any cross-section and in particular as a flat nozzle 54 be executed and extend over the depth of the bag. The positioning device 50 effected with the blowing device 51 aligning the topmost bag with the stopper 52 of the filing table 34 , Through a targeted air blast of the air nozzles 53 the blowing device 51 the sack is directed towards the stop 52 moves and gets to the bag stop end 48 defined at the stop 52 brought. The other end 49 of the bag is adjusted accordingly. Even previously isolated sacks can be aligned accordingly.

4 shows a further enlarged view of the receiving device 30 in the recording position. Additionally marked is an arrow from the air nozzle 53 towards the sack end 48 to the sack at the stop 52 align. The drawn arrow indicates the air flow. The air flow can attack at the protruding end behind the sack seam or it engages a tab 55 which forms, for example, by folding over the bag end when the bag valve 8th on the valve bag 2 is formed. It turns out that a certain area protrudes tab-like, here to transport the valve bag 2 on the stop 52 is used. By a puff of air raises the tab 55 with the free end from the surface of the valve bag 2 and thus allows a particularly effective transport to the stop 52 ,

Also box valve bags can be aligned accordingly. The air flow can attack there under the folded bag bottom. It is also possible to attach a bag or the like on the side wall to align bags.

As in 4 clearly recognizable, is the topmost valve bag to be accommodated 2 with his end 48 at the stop 52 although the underlying valve bags 2 of the sack bundle 5 are not perfectly aligned.

After being in the position of 4 the gripping device 4 with the suction strip and the suckers 59 the end 48 of the valve bag 2 next to the tab 55 has taken, in this embodiment, the gripping device 4 is pivoted upwards by 90 degrees, with the end of the bag 48 upwards and in the direction of the second sack end 49 is spent. The second end 49 the bag can be on the bag bundle 5 remain or it is raised by suitable further sucker to prevent accidental snagging with the underlying valve bags 2 to prevent. This position is in 5 shown.

After the pivoting of the gripping device 4 becomes the investment facility 40 with the roller bar 35 down, with a small gap between the roller bar 35 and the drive belt 36 remains, so that the valve bag 2 is still movable in the vertical direction.

Subsequently, the valve bag 2 aligned in the vertical direction. This is an alignment 32 used that over a blower 39 and the investment facility 40 features. The investment facility 40 lies on the sucker 59 opposite side of the valve bag 2 at. Following this, the vacuum of the nipple 59 shut off while at the same time a puff of air through the blowing device 39 that with air nozzles 41 equipped, is activated. The air flow of the blowing device 39 is oriented vertically upwards or substantially upwards to under the tab 55 of the valve bag 2 to grab and sack the whole of the 5 shown hanging position 37 in the 6 illustrated aligned position 38 to convict.

The valve bag 2 is through the blowing device 39 raised vertically until it passes through the V-shaped top stop 44 is limited in its further movement upwards. In this construction, the bag is in the aligned position 38 defined so that a defined plugging is possible.

In 7 is another embodiment of a slip-on device 20 for use on a clip-on device 10 shown schematically. The slip-on device 20 also has a gripping device 4 that with a suction pad with several suckers 59 equipped. In contrast to the clip-on after 5 and 6 is here in the embodiment of the 7 and 8th the gripping device 4 not provided pivotable, but provided over a parallelogram-like structure movable.

8th shows the gripping device 4 when gripping a valve sack 2 from the bag bundle 5 by means of the suckers 59 , It has surprisingly been found that the suckers 59 Also for use in basically air-permeable textile bags from a fabric or a ribbon fabric find sufficient support, so that a reliable gripping and lifting with the gripping device 4 is possible.

In 8th is the role bar 35 with the investment facility 40 folded away, so that the gripping device 4 with the gripped valve bag 2 from the in 8th position shown in the in 9 shown position can be transferred, in which the valve bag 2 in the hanging position or partially hanging position 37 is arranged.

The fact that the gripper performs a parallelogram-like movement, that is with the sucker 59 taken end 48 aligned parallel to the bag bundle approximately horizontally, while the remaining valve bag 2 hangs down. In the in 9 position shown is the roller bar 35 still a little bit of the drive belt 36 spaced to allow free vertical movement of the valve bag 2 to enable.

The alignment device 32 here includes a blowing device 39 and the investment facility 40 ,

After reaching the in 9 shown position, the suction vacuum is turned off and by means of the blowing device 39 Air obliquely upward in the direction of the V-shaped stop 44 blown so that the valve bag from the in 9 position shown in the in 10 illustrated aligned position 38 is transferred. The drawn arrow indicates the flow of air under the flap 55 of the valve bag 2 grips and holds the sack reliably in the V-shaped stop 44 positioned.

In the background is the valve opening channel 31 to recognize where the valve bag 2 with the as acceleration device 6 trained bag feeder 62 accelerated and finally on a filler neck 3 a packing machine 1 is shot up. The valve opening channel 31 is as a shot channel 7 trained and used to shoot up the valve bags 2 on the filler neck 3 , In other embodiments, it is also possible, the valve bags 2 with the bag feeder 62 directly to the filler neck 3 attach.

After the valve bag 2 at the V-shaped stop 44 has been positioned, the roller bar moves 35 close to the drive 36 so that the valve bag 2 firmly held in between and in the longitudinal direction of the firing channel 7 is drivable.

When the movement starts, the one with its upper end will be 48 obliquely upward valve bag 2 with the deflection device 28 transferred from the oblique to a vertical position. Nothing changes that the bag is kept well defined.

Following this, the bag feed device 62 or acceleration device 6 remain activated until, for example, the front end of the bag falls within the detection range of the in 12 represented sensor 21 arrives. In this bag position 22 a complete stop of the valve bag occurs 2 until the signal for shooting up the valve bag 2 is given.

11 shows a front view into the valve opening channel 31 in, being below the valve opening channel 31 the drive belt 36 and the roll bar 35 are shown, between which the valve bag 2 recorded and accelerated.

The valve opening channel 31 or shot channel 7 consists of two channel parts 25 and 26 that the Aufsteckteilen 23 and 24 the slip-on device 20 assigned.

The shape of the cross section 27 is diamond-shaped here, but may also be polygonal, oval or round.

In the background is the investment facility 40 with the V-shaped top stop 44 and the deflection 28 visible, noticeable.

The valve bag 2 is in the hanging position 29 in which it is aligned in the vertical direction exactly. The hanging position 29 can be the aligned position 38 correspond.

In the valve opening channel 31 or shot channel 7 is a blowing device 9 provided here two air jets 11 and 12 includes. The air nozzles 11 and 12 are on both sides 14 and 15 the valve opening channel 31 provided so that they are on both sides of the valve 8th of the valve bag 2 are arranged. The air nozzles 11 and 12 are designed to air in the direction of the outlet opening 13 the firing channel 7 to blow. The position of the air nozzles 11 and 12 can be adapted to the present conditions. The exact beam direction can be adjustable. A beam direction slightly outward has brought positive results.

The air nozzles 11 and 12 are here at Strömungsleiteinrichtungen 17 and 18 arranged, which lead to a cross-sectional constriction of the flow channel. The flow guides 17 and 18 are here each as a built-in part 19 executed, but can also be an integral part of the valve opening channel 31 or shot channel 7 be.

The flow guides 17 and 18 are in the area in front of the air nozzles 11 and 12 aerodynamically designed, so that in the flow through the valve opening channel 31 the vortex formation is reduced.

The air nozzles 11 and 12 each blow a stream of air 16 as shown by the arrows in 12 is indicated.

The through the flow guides 17 and 18 There caused cross-sectional constriction leads there to an increase in the flow velocity and thus in the lateral areas to a negative pressure, which leads to an opening of the bag valve 8th leads.

The signal to plug in is a short time before the activation of the accelerator 6 given. Between 0.05 and about 1 second before activating the accelerator and actual valve boot 2 becomes the airflow 16 the air nozzles 11 and 12 turned on and can build an approximately stationary flow profile, which is already an opening of the bag valve 8th leads. After the airflow 16 was activated for preferably 0.2 to 0.5 seconds, the drive belt is switched to maximum intended power to the valve bag 2 to accelerate and on the filler neck 3 a packing machine 1 aufzuschießen.

Depending on the desired capacity of the packing machine 1 and the acceleration capability of the accelerator 6 Of course, this can only be accelerated with a partial service.

14 shows a cross section in the height of the air nozzles 11 and 12 the condition of the valve bag 2 when leaving the firing channel 7 , The bag valve 8th is sufficiently open and can be placed on the filler neck 3 the packing machine 1 be plugged or shot.

15 shows a valve bag 2 in a highly schematic plan view and in a schematic side view of the bag end 48 ,

The valve bag 2 consists here of ribbon fabric 57 which is permeable to air. The valve bag 2 points to the end 48 the bag valve 8th on, which by folding and folding several times of the bag end or the end portion 56 originated. This conditionally results in a tab 55 at the end 48 the bag, which is about 0.5 to 4 cm long and provides sufficient flow resistance when under the tab 55 a stream of air is blown to the valve bag 2 to align laterally or vertically.

Overall, the invention provides an advantageous device and an advantageous method, which also valve bags 2 Made of flexible materials with high speed and reliable on the filler neck 3 can be plugged by rotating or stationary packing machines. In this case, a reliable alignment of the valve bags 2 on the storage table 34 to a defined receiving the valve bags 2 to ensure. Furthermore, the valve bags 2 aligned in the vertical direction repeatable and it is done by the air flow in the valve opening channel 31 a reliable opening of the bag valves 8th the valve bags 2 ,

For the purposes of the present invention, the term "air" is understood to mean not only air but also any other gas or gas mixture. The term "air nozzle" basically includes any gas outlet elements and gas outlet surfaces. Are possible round, square, oval, rounded, flat and other cross-sectional shapes on the gas outlet surface. It is also possible, for example, that a pipe or hose is used as a gas outlet. The design does not have to be nozzle-shaped in the narrower sense. Also, an end of a pipe or hose without cross-sectional change is considered as an air nozzle in the context of the present invention.

LIST OF REFERENCE NUMBERS

1

packing machine

2

valve bag

3

filling

4

gripper

5

sack bundle

6

accelerator

7

firing channel

8th

Valve

9

blower

10

slip-on device

11

air nozzle

12

air nozzle

13

outlet opening

14

page

15

page

16

airflow

17

flow guide

18

flow guide

19

fitting

20

Aufsteckeinrichtung

21

sensor

22

sack position

23

An attachment

24

An attachment

25

channel part

26

channel part

27

cross-section

28

deflecting

29

hanging position

30

recording device

31

Valve opening channel

32

aligning

34

tray table

35

roller strip

36

drive belts

37

hanging position

38

aligned position

39

blower

40

equipment installation

41

air nozzle

42

Bin Setup

43

upper stop

44

V-shaped upper stop

46

predetermined angular position

47

eccentric

48

The End

49

The End

50

positioning

51

blower

52

attack

53

air nozzle

54

flat die

55

flap

56

end

57

woven fabric

58

shelf

59

sucker

60

Pack system

61

angle sensor

62

Sack feeder

70

Austrageband

71

Empty bag magazine

Claims (14)

Recording device ( 30 ) for the defined picking up of sacks ( 2 ) and in particular flexible valve bags ( 2 ), with a storage device ( 42 ), on which a sack lying can be arranged and from which a sack ( 2 ) is individually graspable and receivable, characterized in that a positioning device ( 50 ) with at least one blowing device ( 51 ) is provided to at least one targeted air blast the male bag ( 2 ) at a stop ( 52 ) defined position. Recording device ( 30 ) according to claim 1, wherein the topmost bag ( 2 ) of a sack bundle ( 5 ) is tangible and absorbable. Recording device ( 30 ) according to claim 1 or 2, wherein the blowing device ( 51 ) at least one air nozzle ( 53 ). Recording device ( 30 ) according to at least one of the preceding claims, wherein the blowing device ( 51 ) at least one inclined to the horizontal air nozzle ( 53 ), which obliquely from above towards one end ( 48 ) of the bag to be picked up. Recording device ( 30 ) according to at least one of the preceding claims, wherein the blowing device ( 51 ) several spatially offset air nozzles ( 53 ) having. Recording device ( 30 ) according to at least one of the preceding claims, wherein the sacks ( 2 ) at least one overhead flap ( 55 ) exhibit. Recording device ( 30 ) according to the preceding claim, wherein the tab ( 55 ) as a folded end region ( 56 ) is trained. Recording device ( 30 ) according to at least one of the preceding claims, wherein the sacks ( 2 ) at least partially from a fabric and in particular a ribbon fabric ( 57 ) consist. Recording device ( 30 ) according to at least one of the preceding claims, wherein the storage device ( 42 ) a storage surface ( 58 ) and a stop ( 52 ) for an end ( 48 ) of the bags. Clip-on device ( 10 ) with at least one receiving device ( 30 ) according to at least one of the preceding claims. Method for the defined picking up of sacks ( 2 ), in particular for receiving valve bags ( 2 ), whereby at least one sack ( 2 ) on a storage device ( 42 ) and in which by means of at least one blowing device ( 51 ) a positioning device ( 50 ) at least one targeted air blast is issued to the bag ( 2 ) at a stop ( 52 ) defined position. Method according to the preceding claim, wherein a bag bundle ( 5 ) on the storage device ( 42 ) laid flat and the topmost bag ( 2 ), the bag bundle ( 5 ) in particular by drivers on the storage device ( 42 ) is transported. Method according to one of the two preceding claims, wherein the air blast under an overhead folded end region ( 56 ) of the bag ( 2 ). Method according to one of the three preceding claims, wherein the air blast from below under a folded down end portion ( 56 ) of the bag ( 2 ).

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