TWI477424B - Device for opening an end region of a tubular bag body - Google Patents

Description

Opening device for the end region of the tubular bag

The present invention relates to an opening device for an end region of a tubular bag.

Reference is made to the patent documents of German Patent No. DE 974 780 C and DE 10 914 222 B, relating to an opening device and method for the end region of a tubular bag body, the end region extending between an open tubular body end and a bottom centerline. The opening device includes a transport means for transporting the bag body having adjacent pipe walls in a transport direction at a transport speed, and the bottom center line is directed to the transport direction; the opening device includes a plurality of suctions Means, the suction devices are driven to reciprocate in a vertical transport direction, the suction devices being movable toward each other until the suction devices abut against the end regions of the bag between the suction devices The wall of the tube, after which the suction means are movable away from each other, and the suction force acts on the corresponding tube wall, so that the suction means pulls the tube walls away from each other by the suction force, wherein The suction device is reciprocally movable in an oblique direction that is at an angle to the bottom centerline.

Box bags, also known as cross bottom bags, are a cubic bag structure and are produced by bag packaging equipment. In the bag package In the preparation, the end regions of the plurality of tubular bags provided are opened and folded into a cross-bottom structure. During the folding process, the bag systems are flatly guided into the bag encapsulating device such that the tube walls of the bag body abut each other, as well as in the end regions. In order to form the bottom structure, the two tube walls of the end region of the tubular bag are separated and folded down 180 degrees relative to each other, wherein at least one of the walls of the two tubes is by a flaring tool The wall system is folded over itself and defines a first side flap by which the open bottom is formed and the other tube wall forms a second side flap. When the wall of one of the end regions of the tubular bag body is folded down, a triangular hem is formed in the front portion and the rear portion of the end portion, respectively. In terms of technical terms, this step can be called a preliminary procedure. Thereafter, a valve pad can be inserted into the bag body to manufacture a box type valve bag, and the valve pad can form a valve structure by a further folding procedure, whereby the valve bag can be filled by a valve structure The nozzle is filled. Then, the side folds of the bottom of the valve bag are overlapped with each other, and the mutually overlapping side flanges are glued or welded according to the material properties; alternatively or additionally, the bottom cover sheets may be overlaid on the mutual Overlapping side edges are glued or welded.

The above-mentioned bag encapsulating apparatus can be referred to the patent document of Austrian Patent No. AT408427B. however. Since it must be operated in a timed manner, the transmission equipment of the bag packaging device must be of a high level and also reduce the yield of the finished bag body. The time expenditure incurred in preparing the bottom structure (including the fixing after the preparation of the bottom structure) may even set an upper limit on the preparation efficiency of the entire bag packaging apparatus.

Revised in the patent document of European Patent No. EP2441574A1 One of the devices shown to form a bag having an open bottom is to address the above-described deficiencies. Therein, the bag system is continuously conveyed into the device. According to this patent document, the bottom opening device is achieved by separating the two material layers of the end region of the tubular bag body from each other and is designed as a pneumatic bottom opening device. The pneumatic bottom opening device has a plurality of suction devices, and the suction devices are oppositely disposed on the basis of the material layer, and can be separated from each other to achieve the function of attracting and separating the wall of the bag body, thereby the pipe wall system Separate from each other so that the flaring tool can be inserted between the tube walls. In spite of this, this document does not ink the design details of this bottom opening device.

In the patent document of German Patent No. DE 10 2008 017 445 A1, the height of the suction rod of a pneumatic bottom opening device can be adjusted along a horizontal guide which is parallel to a conveying plane, and thus can be adapted to different widths. The body of the bag.

For the opening of the tubular bag body, in order to separate the pipe walls respectively located before and after the suction device as regularly as possible, it is usually required to have a linear opening action, and thus the flaring tool can be easily Insert the open end region of the tubular bag. When the above apparatus is applied to a bag structure for preparing a wide bottom, a simple rotating arm of the device may cause a significant distortion of the material layer and hinder the insertion of the flaring tool due to the irregular opening action. In the disclosure of the above-mentioned patent documents (German Patent Nos. DE 974 780 C and DE 10 918 222 B), the suction device does not move in a linear direction but in a linear direction as well as a pivotal direction or in a ring shape.

Known bottom opening device, such as the Austrian patent number The AT408427B patent document discloses a relatively large-scale device, in which a linear opening action is achieved by means of a piston cylinder with a piston; however, it is obvious that this technical solution has manufacturing and maintenance in addition to occupying space. The problem of high cost exists.

Accordingly, the present invention is a bottom opening device for a bag body packaging apparatus which can achieve high productivity by continuous operation. In addition, the bottom opening device should be simple in construction and low in cost, and should also take into consideration the structural strength to achieve wear resistance as much as possible. In addition, the bottom opening means should also be suitable for opening bottom structures having different widths, and having a proper moving line relationship with subsequent stations, and must be suitable for continuous operation.

The present invention improves the opening device and method of the end region of the tubular bag described above. The suction device is reciprocally movable in an oblique direction, one end of the oblique direction is directed to the transport direction, and the other end is at an angle to the bottom centerline. In addition to being reciprocable in a vertical transport direction, the suction devices are disposed relative to each other on a positioner that is pivotally disposed at a first end of the two relatively parallel rotating arms, and at least one of the rotating arms is driven to be vertical The transporting direction pivots, and the second end of the rotating arms is pivotally provided with a supporting bracket that is driven to reciprocate in the oblique direction in a guide rail. By the movement of the suction device in the oblique direction, the suction point of the suction device on the tube wall can be controlled with respect to the bottom center line, even during operation. Thereby, the device can be applied to a bag body having end regions of different lengths, and these have Bag systems of different length end regions can form finished bag structures having different widths. In addition, since the suction point of the suction device on the tube wall can be adjusted, the wall of the tube can be as close as possible to the outer end of the bag body, and the precision of the opening procedure can be increased. The opening device of the end region of the tubular bag provided by the present invention provides rigidity, rapidity and multiple adjustable selectivity during operation, wherein each rotating arm is driven to be pivoted by a corner bar . In addition to having a simple and relatively cost-effective design, the opening device of the end region of the tubular bag body according to the present invention can also be made by the geometry of the parallelogram unit formed by the positioner, the rotating arm and the support bracket. When the parallelogram unit is pivoted during the opening process, the directionality of the suction device relative to the tube wall is maintained, so that the opening and separation of the tube wall has stable characteristics without distortion; and even When applied to a bag having a wider end region, the flaring tool can also be inserted into the bag in a subsequent step without unsuitable conditions.

The opening device of the end region of the tubular bag body of the present invention is particularly suitable for a bag body prepared from a small telescopic plastic tape and/or a plastic film of a mesh structure, and the synthetic material is preferably selected from the group consisting of polyethylene and poly. Propylene and/or polyethylene terephthalate. The pouch may also be prepared using a combination of the materials described above, and the pouch system preferably comprises a composite coating. For example, in order to adjust the density, printability, and other parametric properties, a composite material coating is applied to the small stretch plastic strip. The bag body made of these small telescopic plastic tapes is superior in strength to paper bags or general plastic bags, but in the manufacturing process, these bag systems are easy to slide and more difficult than paper bags. To fold. Therefore, such a bag body can be processed by the opening means of the end region of the tubular bag body of the present invention.

According to the requirements of the bag body to be manufactured, a bottom structure can be formed in both end regions of the tubular bag body, and the two end regions are opposite to each other; alternatively, the bottom structure can be formed only in one end region.

According to a preferred embodiment of the present invention, if the angle between the oblique direction and the bottom center line or the imaginary extension line thereof is adjustable, the opening device of the end region of the tubular bag body according to the present invention can be applied to The bag body having the end regions of different lengths can be formed into a bag body having a bottom structure of different widths. Thereby, when a narrower bottom structure is to be made, the angle of the angle is increased; and when a wider bottom structure is to be made, the angle of the angle is reduced. When the angle is less than 45 degrees, the accuracy of the opening procedure is increased, preferably in an embodiment, the angle is less than 30 degrees. With the above design, it can be ensured that the opened end region can be properly transported to a subsequent workstation, in particular to a workstation of a flaring tool; in other words, between the open program workstation and the subsequent program workstation. Add an additional workstation to adjust for the unsuitable bag.

In order to avoid the distortion of the pipe wall in the end region of the bag body during the opening process, the suction device moves in the oblique direction when it contacts the pipe wall, and the magnitude of the moving speed is the same as the transport direction. It is equal to the transport speed of the device.

When the suction device is movable in the vertical transport direction by the lateral guiding means, an embodiment in which the mechanical strength is good and the maintenance cost is low can be achieved. The lateral guiding means preferably comprises a vertical transporting side To the set track, swivel arm and/or piston-piston barrel set, and the suction device is located at the free end of the piston. For the same purpose, the suction device can be moved in an oblique direction by oblique guiding means. The oblique guiding means preferably comprises a rail, a rotating arm and/or a piston-piston barrel set disposed in an oblique direction, and the suction means is located at a free end of the piston.

Since the rotating arm with the positioner and the suction device is fixed to a support bracket that can be moved in an oblique direction, in the continuous operation of the bag packaging device, the rotating arm can cooperate with the bag on the conveyor belt in the opening process. The body moves in an oblique direction.

Since the support bracket can be reciprocally moved within the guide rail, movement of any virtual length along the displacement path can be achieved by the support bracket moving at high speed in the guide rail. Thus, the system can exhibit precise bag opening operation and proper bag conveying speed.

Basically, the rotating arm of the parallelogram unit can be driven in any form. In this regard, it is understood that the driving of the rotating arm can be achieved by a servo motor, a motor/gear unit, a hydraulic or hydraulic piston barrel unit, or a wire control. However, in accordance with a preferred embodiment of the present invention, a rotating arm is driven by a corner rod and a plurality of rod members that are coupled to the angle rod and pivoted to a control bracket. Due to the configuration of its parallelogram, it is only necessary to control a single rotating arm for each operation, and the remaining components will move correspondingly due to the structure of the parallelogram. The preferred transmission member includes a corner rod, a plurality of rod members and a control bracket, which have good mechanical properties and require no maintenance cost. The rotating arm is pivoted by the control bracket, and the control bracket is separately movable relative to the support bracket. Thus a linear displacement operation can be constructed.

In order to reduce the parts of the present invention, the support bracket and the control bracket are placed on the guide rail for movement.

Due to the reliability and wear resistance factors, the rotary transmission member, particularly the toothed belt type transmission member, is preferably used for driving the support bracket and the control bracket. The toothed belt drive is highly reliable, long-term, and quick to change, so it can be operated and replaced without special training.

Alternatively, the movement of the support bracket and the control bracket can also be achieved by a piston/piston bucket drive unit, a spindle motor or a servo motor.

In particular, when a bag made of an air permeable mesh structure is used, it may cause a problem because air may enter the pipe wall. In other words, when the suction device acts on the pipe walls, the suction device attracts not only the corresponding pipe wall but also the pipe wall behind the corresponding pipe wall. The action of separating the material layers is achieved. In order to avoid such problems, the suction devices of the present invention are disposed opposite each other and are disposed offset from each other. According to the positional relationship of such a suction device, a stable wall separation operation can be achieved.

In a preferred embodiment, the adjustable bearing can be adjusted such that the direction of the guide rail can be adjusted from an oblique direction toward a bottom center line by an adjustable angle. If the adjustment bearing comprises a plurality of long holes having a plurality of bearing points defined by the plurality of recesses, the angle with respect to the bottom center line can be quickly adjusted and changed. The above changes can be made by a single person by simple work Achieved.

In a preferred embodiment, the motor drive member is used to adjust the bearings of the guide rail. In such a case, the adjustment of the angle does not require the use of a tool, and it can be applied to a bag-packaging device that is controlled and operated by a computer.

1‧‧‧Opening device

2‧‧‧Transportation means

3‧‧‧Locator

4, 5‧‧‧ rotating arm

7‧‧‧Support bracket

8‧‧‧Parallelogram unit

9‧‧‧ rods

10‧‧‧ bag body

10a‧‧‧First wall

10b‧‧‧Second wall

10e, 10f‧‧‧ end zone

10g‧‧‧ gap

10j‧‧‧ bottom centerline

10k‧‧‧ end of tube body

11a, 11b‧‧‧ stop plate

12‧‧‧ bottom center folding track

13, 14‧‧‧ suction device

15, 16‧‧‧ lateral guidance

17, 18‧‧‧ oblique guidance

20‧‧‧Bottom opening unit

21‧‧‧Control bracket

22‧‧‧ rails

23‧‧‧ corner pole

24, 25‧‧‧ toothed belt drive parts

26‧‧‧Double arrow

27‧‧‧Long hole

28‧‧‧ recessed department

30‧‧‧Support

A1, A2‧‧‧ segments

P1, P2‧‧‧ arrows

L‧‧‧ longitudinal extension

S‧‧‧ oblique direction

T‧‧‧Transportation direction

V‧‧‧Transport speed

α, β‧‧‧ angle

Ε1‧‧‧ first plane

Ε2‧‧‧ second plane

Fig. 1 is a partial schematic view (1) of a bag body packaging apparatus using an opening device for the end region of the tubular bag body of the present invention.

Figure 2 is a partial schematic view (2) of a bag encapsulating apparatus using an opening device for the end region of the tubular bag of the present invention.

Figure 3 is a partial schematic view (3) of a bag encapsulating apparatus using an opening device for the end region of the tubular bag of the present invention.

Figure 4 is a perspective view showing an embodiment of a bottom opening unit among the opening devices of the end region of the tubular bag body of the present invention.

Figure 5 is a schematic plan view of the bottom of the bottom opening unit.

Figure 6 is a side view of the bottom opening unit.

Hereinafter, the opening device, the method, and the bottom structure forming process of the end region of the tubular bag according to the present invention are explained in the first to sixth figures. For the sake of easy understanding, in the first to third figures The necessary elements of the invention are only schematically depicted.

The opening device 1 of the end region of the tubular bag body (hereinafter referred to as the opening device 1) comprises a transport means 2 which is presented in the form of a conveyor belt which is continuously moved at a transport speed V to a transport direction T. Complex tube The body 10 is laid flat on the transport means 2 (or on the conveyor belt) in the form of a longitudinal extension L perpendicular to the transport direction T. On the conveyor belt, the tubular bag body 10 is fixed by a fixing means (not shown) to prevent the tubular bag body 10 from sliding.

For example, the tubular bag body 10 can be prepared by a plurality of small stretchable plastic tapes having a mesh structure. The small telescopic plastic tape may comprise polyethylene, polypropylene or polyethylene terephthalate (PET). Optionally, the network structure comprises a coating of a synthetic material. Alternatively, the tubular bag body 10 can also be made of a plastic film.

The tubular bag body 10 has two open end regions 10e, 10f which are disposed relative to each other. The end region 10e extending between the open tubular body end 10k and a bottom centerline 10j will form an intersecting bottom structure. In the subsequent procedure, the end region 10f can also form a cross-bottom structure in the same manner, whereby a box-type bag structure or a box-type valve bag can be manufactured.

In Fig. 1, it can be seen that in the initial state, the tubular bag body 10 is placed flat on the transport means 2 with a first plane ε 1 . In this state, a first tube wall 10a and a second tube wall 10b are mutually abutting. Next, the end region 10e of the tubular bag body 10 is formed from the first plane ε 1 of the flatly placed bag body 10 along the bottom center by a bottom center folding rail 12 and the stopper plates 11a, 11b. The line 10j is moved to a second plane ε 2 whose direction is perpendicular to the first plane ε 1 . Here, the composition of the bottom structure may not require this folding step.

Fig. 2 shows that the end region 10e of the tubular bag body 10 is completely folded upward in a vertical direction along the bottom center line 10j (toward the second plane ε 2). At this time, the bottom center folding rail 12 extends in the transport direction T and cooperates with the stopper plate 11a so that the end region 10e of the bag body 10 which has been folded to the second plane ε 2 can be opposed to the bag body 10 The first plane ε 1 placed is maintained at an angular positional relationship. The opening device 1 further comprises two suction devices 13, 14 which are reciprocally movable perpendicular to the transport direction T by means of the lateral guiding means 15, 16 (the figure is symbolic representation) ). The lateral guiding means 15, 16 can be a track or a rotating arm. Alternatively, the lateral guiding means 15, 16 may also be a piston/piston barrel set, and the suction means 13, 14 are arranged at the free end of the piston and are reciprocally movable in the vertical transport direction T. In an embodiment, the lateral guiding means 15, 16 can be reciprocated along the oblique direction S by the oblique guiding means 17, 18 from the transport direction T toward the bottom center line 10j. Or the angle α of one of the imaginary extension lines is defined by the angle α . The bottom centerline 10j or its relative extension extends from the first plane ε 1 towards the transport direction T. The oblique guiding means 17, 18 can also be realized by a structure such as a rail, a rotating arm, a piston/piston barrel set or the like.

In the second figure, the two suction devices 13 and 14 are respectively in contact with the first pipe wall 10a and the second pipe wall 10b from different sides of the end region 10e, and the suction devices 13, 14 can be pumped. Suction, so that the first suction device 13 sucks the first tube wall 10a, and the second suction device 14 sucks the second tube wall 10b. It should be noted that when the suction devices 13, 14 are in contact with the tube walls 10a, 10b, the suction devices 13, 14 are moved along the oblique direction S, and among the moving speed amounts thereof. The direction is the same as the transport direction T, and the size is equal to the transport speed V of the opening device 10, so that the tube walls 10a, 10b can be prevented from being twisted. Then, the two suction devices 13, 14 are moved away from each other in the direction of the vertical transport direction T (indicated by arrows P1 and P2, respectively), whereby the two suction devices 13, 14 respectively drag the corresponding pipe walls The end regions 10e of the tubular bag body 10 can be opened by 10a, 10b. Since the suction means 13, 14 are moved in the oblique direction S, the attraction points of the suction means 13, 14 on the tube walls 10a, 10b can be controlled relative to the bottom center line 10j, even during the operation of the opening means 1. Make adjustments. Thereby, the opening device 1 can be applied to the bag body 10 having the end regions 10e of different lengths, and the bag bodies 10 having the end regions 10e of different lengths can form the finished bag structure having different widths. In addition, since the suction points of the suction devices 13, 14 on the tube walls 10a, 10b can be adjusted, the suction devices 13, 14 can be as close as possible to the outer end of the bag body 10, and can be increased Turn on the accuracy of the program. By the above, before the opening step, whether the end region 10e is folded relative to the remaining bag body 10 along the bottom center line 10j (as shown in Fig. 2) will not be affected. If the end region 10e has not been folded during the opening process, in other words, the end region 10e is still at the first plane ε 1, the opening device 1 is rotated to make the suction devices 13, 14 top-down. The direction is attractive. Here, it is only necessary to confirm that at least a part of the end region 10e is in a state of being exposed to the outside.

Fig. 3 shows a gap 10g formed in the tube walls 10a, 10b when the end region 10e of the tubular bag body 10 is in an open state. between. In Fig. 3, it can also be seen that the suction devices 13, 14 are no longer attractive so that the suction devices 13, 14 no longer attract the corresponding tube walls 10a, 10b, so that the suction devices 13, 14 can be The oblique direction S is moved and reset to prepare for the opening process of the next bag 10. In Fig. 3, the structure of the workstation corresponding to the step of forming the bottom structure downstream of the opening device 1 is not labeled here, nor is it intended to be protected by the scope of the invention.

In the fourth to sixth figures, a bottom opening unit 20 of the opening device 1 is denoted by reference numeral 20. Fig. 4 is a perspective view of the bottom opening unit 20, Fig. 5 is a bottom plan view of the bottom opening unit 20 which is slightly simplified, and Fig. 6 is a side view thereof. For ease of understanding, only one suction device 14 is shown in FIG. In the bottom opening unit 20, the suction devices 13, 14 are arranged on the positioner 3 and are rotated towards each other. Since the bottom opening unit 20 is substantially symmetrically disposed, the following description will be made only by the related elements described above, but it should be understood that the components and functions corresponding to the elements not mentioned above are located on the other side. the same.

The positioner 3 is pivotally disposed at a first end of the two parallel rotating arms 4, 5, and at least one of the rotating arms 4, 5 (here, the rotating arm 4) is driven to be vertical The transport direction T pivots. The second ends of the two rotating arms 4, 5 are pivotally disposed on a support bracket 7, and the support bracket 7 is driven to reciprocate in the oblique direction S in a guide rail 22. The bottom opening unit 20 is fixed to a support member 30, and the guide rail 22 is directed to the transport direction T and is parallel to the oblique direction S (see section 6). Figure).

The positioner 3, the two rotating arms 4, 5 and the support bracket 7 form a parallelogram unit 8, and its parallelogram configuration is also maintained during pivoting. Therefore, when the two rotating arms 4, 5 are pivoted, the positioner 3 and the suction means 13, 14 disposed thereon can maintain their directionality with respect to the tube walls 10a, 10b, thereby avoiding the tube wall during the opening process. 10a, 10b are twisted.

In Fig. 4, each of the swivel arms 4, 5 is driven to be pivoted by a corner rod 23 which is connected to the swivel arms 4, 5 and to a rod member 9, The rod 9 is pivotally mounted on a control bracket 21 . The control bracket 21 is embedded in the guide rail 22 and reciprocally movable therein. The support bracket 7 and the control bracket 21 are driven by the toothed belt drive members 24, 25.

In Fig. 4, it is further seen that the bottom opening unit 20 includes an elongated hole 27 having a recessed portion 28, whereby the position of the guide rail 22 can be adjusted.

Referring to Figure 5, it can be seen that the support bracket 7 and the control bracket 21 are moved along the guide rail 22 by the toothed belt drive members 24, 25, respectively. Under suitable control, the aforementioned parallelogram unit 8 (provided with suction means 13, 14 (not shown) can be moved in the direction indicated by the double arrow 26, wherein the arrow T is the first to the first 3 The transport direction T referred to in the figure. By the relative movement of the support bracket 7 and the control bracket 21 (for the rotating arms 4, 5, which is converted into a pivotal movement by the rod 9 and the corner rod 23), an opening and closing action can be achieved. . In Figure 5, It should be particularly noted that even when the rotating arms 4, 5 are pivoted, the positioner 3 has no directivity with respect to the plane of the guide rail 22 of the suction device 14 based on the pivotal form of the parallelogram structure. change.

In Fig. 6, at least two angular positions of the bottom opening unit 20 with respect to the first plane ε 1 of the bottom center line 10j or the bottom center line 10j can be seen. In Fig. 6, the bottom opening unit 20 is screwed tightly to the support member 30 by its lower recessed portion 28, whereby two bearing points are defined which are connected by a line segment A1. The line segment A1 is parallel to the longitudinal axis of the guide rail 22 and parallel to the oblique direction S, whereby the guide rail 22 is coupled to the control bracket 21, the support bracket 7, the rod member 9, the parallelogram unit 8, and the oppositely disposed on the parallelogram unit. the suction devices 13, 14 or along the bottom center line 10j constituting a first plane ε 1 angle α of a moving direction, so that the bag body 10 of different widths can be turned with respect to the accurately. In this regard, it is important to arrange the guide rails 22 parallel to the oblique direction S. In order to change the angle, the bottom opening unit 20 is tightly interlocked with the support member 30 through its upper recessed portion 28, so that two bearing points are again defined, which are connected by a line segment A2. The angle formed by the above-mentioned adjustment of the longitudinal axis of the guide rail 22 (which is also the angle defined by the oblique direction S and the bottom center line 10j) is β , which is smaller than α . Even if different angle adjustments are made, the opening of the bottom opening unit 20 to the end region 10e is not affected, so that when the bag body 10 is transported to the subsequent flaring tool, the bag body 10 cannot be guided or It is the bag body 10 that is in a relatively unclear state. In other words, there is no need to add an additional workstation between the open program workstation and the subsequent program workstation, and the bag 10 that is not oriented is adjusted.

Although the technical content of the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and any modifications and refinements made by those skilled in the art without departing from the spirit of the present invention are encompassed by the present invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

1‧‧‧Opening device

2‧‧‧Transportation means

10‧‧‧ bag body

10a‧‧‧First wall

10b‧‧‧Second wall

10e, 10f‧‧‧ end zone

10k‧‧‧ end of tube body

12‧‧‧ bottom center folding track

13, 14‧‧‧ suction device

15, 16‧‧‧ lateral guidance

17, 18‧‧‧ oblique guidance

P1, P2‧‧‧ arrows

L‧‧‧ longitudinal extension

S‧‧‧ oblique direction

T‧‧‧Transportation direction

V‧‧‧Transport speed

‧‧‧‧ angle

Ε1‧‧‧ first plane

Ε2‧‧‧ second plane

Claims (13)

An opening device for an end region of a tubular bag body, wherein an end region of the bag body extends between an open tubular body end and a bottom centerline, the device comprising: a transport means for enabling two phases The bag body of the adjacent pipe wall is transported in a transport direction at a transport speed, the bottom center line is directed to the transport direction; and a plurality of suction devices are driven to reciprocate vertically in the transport direction, The suction devices are movable toward each other until the suction devices abut against the tube walls of the end region of the bag between the suction devices, after which the suction The devices are movable away from each other, and a suction force acts on the corresponding tube walls, whereby the suction devices use the suction force to pull the tube walls away from each other; wherein, the pumping The suction device is reciprocally movable in an oblique direction, the oblique direction being at an angle with the bottom center line; wherein the oblique direction is directed to the transport direction, and the suction devices are disposed relative to each other in a positioner Above, the locator The first end of the two parallel rotating arms is pivoted, and the at least one rotating arm is driven to pivot perpendicularly to the transport direction, and the second ends of the rotating arms are pivotally provided with a supporting bracket. The support bracket is driven to reciprocate in the oblique direction within a guide rail. An opening device for an end region of a tubular bag according to claim 1, wherein each of the rotating arms is driven and can be borrowed A pivot is achieved by a corner pole. The opening device of the end region of the tubular bag body according to claim 2, wherein the angle bar is steered by a control bracket through the plurality of lever members, and the control bracket is reciprocally movable to the guide. The opening device of the end region of the tubular bag body according to the first or third aspect of the invention is characterized in that the support bracket and the control bracket are guided on the guide rail. The opening device of the end region of the tubular bag body according to any one of claims 1 to 4, wherein the support bracket and/or the control bracket can be achieved by a plurality of rotating transmission members. Reciprocating motion, in particular by reciprocating motion through a plurality of toothed belt drive members. The opening device for the end region of the tubular bag body according to any one of the items 1 to 5, wherein the guide rail can be driven by an adjustable bearing via a manual or a motor. The direction defines an adjustable angle from the oblique direction toward the bottom centerline. An opening device for an end region of a tubular bag according to claim 6 is characterized in that the adjustable bearing comprises a plurality of elongated holes having a plurality of bearing points defined by the plurality of recesses. The opening device of the end region of the tubular bag according to any one of the items 1 to 7, wherein the angle of the oblique direction can be adjusted toward the bottom center line. An opening device for an end region of a tubular bag according to any one of claims 1 to 8, characterized in that the oblique direction and the bottom portion The angle defined by the centerline is less than 45 degrees, preferably less than 30 degrees. The opening device of the end region of the tubular bag body according to any one of the items 1 to 9, wherein the suction device is in contact with the pipe walls, the suction devices The movement is along the oblique direction, and the components of the suction device having the same direction as the transport speed are the same as the transport speed of the opening device. The opening device of the end region of the tubular bag body according to any one of claims 1 to 10, characterized in that the suction device is movable in a vertical transport direction by a plurality of lateral guiding means The lateral guiding means preferably comprises a plurality of rails, a plurality of rotating arms and/or a plurality of piston-piston barrel sets disposed perpendicular to the transport direction, and the suction means are located at the free ends of the pistons. The opening device of the end region of the tubular bag body according to any one of claims 1 to 11, wherein the suction device is capable of being inclined by a plurality of oblique guiding means Directional movement, the oblique guiding means preferably comprises a plurality of tracks, a plurality of rotating arms and/or a plurality of piston-piston barrel sets disposed in the oblique direction, and the suction devices are located in the pistons Free end. The opening device of the end region of the tubular bag body according to any one of claims 1 to 12, characterized in that the suction devices are disposed oppositely and offset from each other.