A packaging bag packaging device

Abstract

The utility model discloses a kind of packaging bag packaging devices, including, film tape conveying component, including multiple traction rollers, multiple traction rollers are pulled to forming station with film tape;Membrane cylinder forming component is set on forming station and is used to be shaped as membrane cylinder with film tape;Bag sealing assembly, including first encapsulation mechanism and second encapsulation mechanism, first encapsulation mechanism includes first driving part and two first heat pressure pieces oppositely arranged, first driving part is used to drive two first heat pressure pieces to move towards, to make two first heat pressure pieces edge film cylinder along first direction;Second encapsulation mechanism includes second driving part and two second heat pressure pieces oppositely arranged, second driving part is used to drive two second heat pressure pieces to move towards, to make two second heat pressure pieces edge film cylinder along second direction;Detection piece, for detecting film tape.The utility model can monitor the amount of pulling belt of film tape in real time and feedback to control system by detection piece, control system can correct the amount of pulling belt, avoid cumulative error expansion.

Description

Technical Field

[0001] This utility model relates to the field of packaging bag production technology, and in particular to a packaging bag sealing device. Background Technology

[0002] In the mass production of packaging bags, precise control of the pull tab length directly affects the final dimensional consistency of the bags. As downstream industries increase their standardization requirements for packaging bags—for example, food packaging needs to match the fixed bag length specifications of automated filling lines—cumulative errors in the pull tab length can lead to bag length deviations, making them unsuitable for subsequent processes. Furthermore, in high-speed production lines, the pull tab is continuously conveyed, and errors accumulate over time. If these errors are not detected in time, they will result in a large number of defective products, wasting raw materials and requiring additional sorting costs, thus impacting the company's production efficiency and economic benefits. Therefore, it is urgent to solve the problem of uncontrolled errors caused by the lack of feedback on pull tab length. Traditional packaging devices lack a feedback mechanism for the tape pull length, relying heavily on preset rotation speeds of the traction rollers to estimate the tape pull amount. This neglects actual operating conditions such as tape slippage and roller wear, easily leading to excessive cumulative errors due to the lack of feedback. Furthermore, even with simple detection methods, these only address obvious anomalies like tape breakage, failing to monitor tape pull length deviations in real time and hindering dynamic adjustment of traction parameters. This results in a continuous accumulation of tape pull length errors during production, ultimately causing packaging bag sizes to fail to meet standards, increasing rework rates, making it difficult to meet high-precision production requirements, and restricting the quality stability even after production line speed increases. Summary of the Invention

[0003] In order to overcome at least one of the defects of the prior art, the present invention provides a packaging bag sealing device, which can monitor the amount of film tape pulled in real time through a detection element and feed it back to the control system. The control system can correct the amount of tape pulled to avoid the cumulative error from expanding.

[0004] The technical solution adopted by this utility model to solve its problem is: A packaging bag sealing device, comprising, A frame, wherein a forming station, a first pressing station and a second pressing station are provided on the frame; The film conveyor assembly includes multiple rotatable traction rollers, which are used to pull the film belt to the forming station during rotation; A membrane tube forming assembly is disposed at the forming station, and the membrane tube forming assembly is used to form the membrane strip into a membrane tube; The sealing assembly includes a first sealing mechanism disposed on a first pressing station and a second sealing mechanism disposed on a second pressing station. The first sealing mechanism includes a first driving member and two opposing first hot pressing members. The first driving member is used to drive the two first hot pressing members to move towards each other, so that the two first hot pressing members seal the film tube along a first direction. The second sealing mechanism includes a second driving member and two opposing second hot pressing members. The second driving member is used to drive the two second hot pressing members to move towards each other, so that the two second hot pressing members seal the film tube along a second direction. The testing element is used to test the membrane strip.

[0005] As an optional implementation, a guide assembly is provided between the first pressing station and the second pressing station. The guide assembly is used to guide the film tube encapsulated by the first packaging mechanism to the second pressing station. The guide assembly includes a third driving member and two guide members arranged opposite to each other in a second direction, with a guiding gap between the two guide members. The third driving member is used to drive the two guide members to rotate.

[0006] As an optional implementation, the guide interval is provided with a guide plate at its end along the first direction.

[0007] As an optional implementation, the first hot press includes a first pressing block, the first pressing block having a first indentation portion, both the first pressing block and the first indentation portion extending along a first direction; the first packaging mechanism and the second packaging mechanism are spaced apart along the first direction.

[0008] As an optional implementation, the second hot press includes a second pressing block, the second pressing block having two second indentation portions, both the second pressing block and the second indentation portions extending along a second direction; the two second indentation portions are spaced apart along a first direction.

[0009] As an optional implementation, a cutting blade is provided between the two second indentations.

[0010] As an optional implementation, the membrane tube forming assembly includes a forming element that is frustum-shaped.

[0011] As an optional implementation, a marking component is also included, which is disposed between the film conveying component and the film tube forming component, and is used to mark the film.

[0012] In summary, the packaging bag sealing device provided by this utility model has the following technical effects: During the film belt conveying and film cylinder sealing process, the detection device can detect the film belt's movement distance and monitor the cumulative error of the film belt pulling length. If the film belt pulling amount deviates due to factors such as film belt slippage or roller wear, for example, the actual length is less than the standard length, the detection device generates an electrical signal and transmits it to the control system. The control system immediately adjusts the traction roller speed based on the electrical signal, such as increasing the output power of the drive motor, to correct the pulling amount and prevent the cumulative error from expanding. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the packaging bag sealing device according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the packaging bag sealing device of this utility model embodiment, with part of the frame hidden. Figure 3 This is a schematic diagram of the packaging bag sealing device of this utility model embodiment, with the entire frame hidden. Figure 4 This is a schematic diagram of the structure of the bag sealing assembly according to an embodiment of the present utility model; Figure 5 for Figure 4 A structural diagram from another perspective.

[0015] The meanings of the reference numerals in the attached figures are as follows: 10. Frame; 11. Mounting frame; 12. Support frame; 13. Rotating frame; 20. Membrane belt conveyor assembly; 21. Traction roller; 22. Membrane belt; 23. Membrane tube; 24. Membrane roll; 241. Rotating shaft; 25. Drive motor; 30. Membrane tube forming assembly; 40. First packaging mechanism; 41. First driving component; 42. First hot pressing component; 421. First indentation part; 422. Thermocouple; 50. Second packaging mechanism; 51. Second driving component; 52. Second hot pressing component; 521. Second indentation part; 522. Cutting blade; 60. Detection component; 70. Guide assembly; 71. Third driving component; 72. Guide component; 73. Guide interval; 80. Marking assembly; 90. Guide plate. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0018] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0019] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0020] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0021] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0022] See Figure 1 and Figure 2 This utility model discloses a packaging bag sealing device, which includes a frame 10, a film conveyor assembly 20, a film tube forming assembly 30, a bag sealing assembly, and a detection component 60. Specifically, the frame 10 is provided with a forming station, a first pressing station, and a second pressing station; see reference. Figure 3 The film belt conveyor assembly 20 includes multiple rotatable traction rollers 21, which are used to pull the film belt 22 to the forming station during rotation. The film tube forming assembly 30 is disposed at the forming station and is used to form the film belt 22 into a film tube 23.

[0023] See Figure 4 and Figure 5 The sealing assembly includes a first sealing mechanism 40 disposed on a first pressing station and a second sealing mechanism 50 disposed on a second pressing station. The first sealing mechanism 40 includes a first driving member 41 and two opposing first hot-pressing members 42. The first driving member 41 drives the two first hot-pressing members 42 to move towards each other, so that the two first hot-pressing members 42 seal the film tube 23 along a first direction. The second sealing mechanism 50 includes a second driving member 51 and two opposing second hot-pressing members 52. The second driving member 51 drives the two second hot-pressing members 52 to move towards each other, so that the two second hot-pressing members 52 seal the film tube 23 along a second direction. Furthermore, a detection member 60 is used to detect the film strip 22.

[0024] Based on this structure, when using the packaging bag sealing device of this utility model, the film roll 24 is first installed on the frame 10 through the rotating shaft 241, and then the film roll 24 is rotated to release the film strip 22. The film strip 22 can be a packaging bag substrate such as plastic film or composite film. Then the film strip 22 is installed on multiple traction rollers 21 according to a preset path. Then the drive motor 25 of the film strip conveying assembly 20 is started to drive the traction rollers 21 to rotate. The film strip 22 moves at a stable speed under the drive of the traction rollers 21, and passes through the forming station, the first pressing station and the second pressing station in this way.

[0025] When the film strip 22 is pulled to the forming station, it is formed from a sheet into a cylindrical film tube 23 under the action of the forming component. The film tube 23 then enters the first pressing station. The first driving member 41 of the first packaging mechanism 40 drives two opposing first hot-pressing members 42 to move towards each other, applying pressure and heat to the film tube 23 after passing through the first pressing station. This completes a first sealing along a preset first direction (e.g., transverse, perpendicular to the conveying direction of the film tube 23), forming the side seal of the packaging bag. When the film tube 23, having completed the first sealing, continues to move into the second pressing station, the second driving member 51 drives two opposing second hot-pressing members 52 to move towards each other, performing a second sealing along a second direction perpendicular to the first direction (e.g., longitudinal, parallel to the conveying direction of the film tube 23), forming the upper and lower end seals of the packaging bag.

[0026] During the conveying of the membrane belt 22 and the sealing process of the membrane cylinder 23, the detection element 60 can detect the moving distance of the membrane belt 22 and monitor the cumulative error of the stretching length of the membrane belt 22. Specifically, the detection element 60 can be a photoelectric encoder, displacement sensor, etc. When the conveying system drives the membrane belt 22 to move, the sensor of the detection element 60 will form a linkage monitoring with the traction roller 21 of the membrane belt 22 or the surface of the membrane belt 22. For example, the photoelectric encoder can calculate the theoretical stretching length by recognizing the number of rotations of the traction roller 21 and combining it with the preset circumference of the traction roller 21. At the same time, the sensor will also directly collect the actual moving distance of the membrane belt 22, such as capturing the displacement change of the edge of the membrane belt 22 in real time through laser ranging, and comparing the "theoretical stretching length" with the "actual stretching length" in real time.

[0027] If a deviation occurs, such as the actual length being less than the standard length, it indicates that the film strip 22 may be slipping. In this case, the detection element 60 generates an electrical signal and transmits it to the control system. The control system immediately adjusts the speed of the traction roller 21 based on the electrical signal, such as increasing the output power of the drive motor 25, to correct the amount of film pulling and prevent the cumulative error from expanding. In other words, the detection element 60 can feed back the actual film pulling data to the control system in real time, forming a closed-loop control of "detection-comparison-adjustment". When a deviation in the amount of film pulling occurs, the control system can respond quickly, such as adjusting the speed of the traction roller 21 and correcting the working sequence of the sealing mechanism, without the need for manual intervention, thus improving the operational stability of the device.

[0028] Therefore, the packaging bag sealing device of this utility model integrates multiple processes such as conveying, forming, and sealing, replacing manual operation, improving the production efficiency of packaging bags, and adapting to large-scale needs. The detection component 60 can dynamically collect the belt pulling data, avoiding the continuous accumulation of errors caused by slippage of the traction roller 21 and stretching deformation of the film belt 22 in the traditional "no feedback" mode, ensuring that the length of each belt pulling segment is consistent with the preset standard value, and guaranteeing the dimensional accuracy of the packaging bag.

[0029] The film conveyor assembly 20 is mounted on the frame 10 via the mounting frame 11, the shaft 241 of the film roll 24 is mounted on the mounting frame 11 via the support frame 12, a traction roller 21 is mounted on the mounting frame 11 via the rotating frame 13, and the detection element 60 is mounted on the traction roller 21 and rotates with the rotation of the traction roller 21.

[0030] As an optional implementation, a guide assembly 70 is provided between the first pressing station and the second pressing station, and the guide assembly 70 is used to guide the film tube 23 encapsulated by the first encapsulation mechanism 40 to the second pressing station. Specifically, the guide assembly 70 includes a third driving member 71 and two guide members 72 disposed opposite to each other in a second direction, with a guide gap 73 formed between the two guide members 72, and the third driving member 71 is used to drive the two guide members 72 to rotate.

[0031] During use, the relative positions of the two guides 72 can be finely adjusted by the third drive 71 according to the diameter of the membrane tube 23 to be processed, so that the guide interval 73 between them matches the outer diameter of the membrane tube 23. After the membrane tube 23 completes the first-direction edge sealing at the first pressing station, it enters the guide interval 73 of the guide assembly 70; at this time, the third drive 71 drives the two guides 72 to rotate synchronously (the rotation direction is consistent with the conveying direction of the membrane tube 23), and through the friction or clamping force between the guides 72 and the surface of the membrane tube 23, the membrane tube 23 is smoothly and accurately conveyed to the second pressing station.

[0032] The third drive component 71 can be a servo motor or a stepper motor. The motor output shaft is connected to the rotating shaft 241 of the two guide components 72 via a synchronous belt or gear set to ensure that the two guide components 72 rotate synchronously. The main body of the guide component 72 is a cylindrical rubber roller or silicone roller with a certain elasticity and friction on its surface, which can both avoid scratching the surface of the membrane cylinder 23 and provide stable conveying power. The two ends of the roller body are connected to the frame 10 through bearings to ensure smooth rotation.

[0033] Therefore, by guiding the interval 73 to limit the offset of the membrane tube 23, the membrane tube 23 is prevented from tilting or wrinkling due to its own weight or conveying inertia between the two pressing stations, ensuring accurate posture when entering the second pressing station and improving the alignment and sealing of the second direction sealing edge.

[0034] As an optional implementation, the guide interval 73 is provided with a guide plate 90 at its end along the first direction.

[0035] Specifically, the guide plate 90 can be an inclined guide plate 90. After the membrane tube 23 is sealed at the first pressing station, it enters the guide interval 73 formed by the two guide members 72. Under the action of the third driving member 71 driving the guide members 72 to rotate, it is conveyed along the guide interval 73 to the second pressing station. When the membrane tube 23 is sent out from the outlet end of the guide interval 73, it is received by the guide plate 90. Since the guide plate 90 is inclined towards the second pressing station along the conveying direction of the membrane tube 23, and the plate surface is adapted to the conveying path of the membrane tube 23, the membrane tube 23 is sent into the sealing area of ​​the second pressing station under its own conveying inertia and the guiding action of the inclined surface of the guide plate 90, and the second sealing mechanism 50 completes the sealing in the second direction.

[0036] As an optional implementation method, see [link / reference]. Figure 4 and Figure 5 The first hot-pressing component 42 includes a first pressing block, on which a first indentation portion 421 is provided, and both the first pressing block and the first indentation portion 421 extend along a first direction. The first packaging mechanism 40 and the second packaging mechanism 50 are spaced apart along the first direction.

[0037] In use, after the film tube 23 is formed at the forming station, it first reaches the first pressing station along the conveying direction. The first driving member 41 drives two opposing first hot pressing members 42 to move towards each other, so that the first indentation part 421 on the two first pressing blocks accurately fits the area to be sealed on the film tube 23. Since the first pressing block and the first indentation part 421 both extend along the first direction, continuous and regular indentation sealing will be formed on the film tube 23 along the first direction during pressing. After the sealing in the first direction is completed, the film tube 23 continues to move along the conveying direction until it reaches the second pressing station, where the second packaging mechanism 50 completes the subsequent sealing along the second direction, finally forming a sealed packaging bag that meets the requirements.

[0038] As an optional implementation, the second hot-pressing member 52 includes a second pressing block, on which two second indentation portions 521 are provided, and both the second pressing block and the second indentation portions 521 extend along a second direction. The two second indentation portions 521 are spaced apart along a first direction.

[0039] In use, after the film tube 23 completes the first-direction sealing at the first pressing station, it reaches the second pressing station along the conveying path. The second driving component 51 drives two opposing second hot pressing components 52 to move towards each other, so that the two second indentation portions 521 on the two second pressing blocks are precisely aligned with the area to be sealed on the film tube 23. Because the two second indentation portions 521 are arranged at intervals along the first direction and extend synchronously with the second pressing blocks, two parallel and evenly spaced indentation sealing edges are formed on the film tube 23 along the second direction during pressing. After pressing is completed and the second hot pressing components 52 are reset, the film tube 23 continues to be conveyed. The two spaced second-direction sealing edges can be directly used as the separating sealing edges of adjacent packaging bags without the need for subsequent additional cutting or secondary sealing, realizing the process connection of "completing double sealing in one pressing".

[0040] Therefore, by setting two second embossing sections 521 to press synchronously, two sealing edges along the second direction can be formed in a single operation. Compared with the traditional method that requires two pressings for a single embossing section, the efficiency is doubled, and the spacing between the two sealing edges is uniform, avoiding spacing deviations caused by manual adjustment, and adapting to the needs of mass production. The spacing between the two second embossing sections 521 along the first direction can be preset according to the width of the packaging bag. By changing the second pressing blocks with different spacing specifications, packaging bags of different widths can be produced without redesigning the sealing mechanism, reducing equipment adjustment costs and enhancing the adaptability of the device to multiple product categories.

[0041] It should be noted that both the first indentation portion 421 and the second indentation portion 521 can be multiple elongated protrusions provided on the pressure block, with the protrusion cross-section being trapezoidal or rectangular with a rounded top. A heating element, such as a thermocouple 422, is provided inside the pressure block.

[0042] The first driving component 41 may specifically include a servo motor and a ball screw, or it may be a double-acting cylinder. The second driving component 51 may specifically include two cylinders, each of which independently controls one of the two second hot-pressing components 52.

[0043] As an optional implementation, a cutting blade 522 is provided between the two second indentation portions 521.

[0044] In this process, after the second driving member 51 drives the two opposing second hot pressing members 52 to move towards each other, two spaced sealing edges can be formed on the film tube 23. These two sealing edges can be directly used as separating sealing edges between adjacent packaging bags. When the second driving member 51 drives the two second hot pressing members 52 to move away from each other, it can drive the cutting blade 522 to cut the film tube 23. The cut individual packaging bags leave the station along the conveying path, while the uncut portion of the film tube 23 continues to be conveyed to the second pressing station.

[0045] In this way, the traditional two-step process of "sealing the edges first and then cutting" is integrated into the same station, eliminating the step of transferring the film tube 23 to the cutting station after sealing the edges, reducing the interval time between processes, and is especially suitable for high-speed production lines, avoiding efficiency losses caused by process connection.

[0046] It should be noted that this utility model, composed of a dual pneumatic control unit (including two independent solenoid valves and a pressure regulating valve), a dual-piston rod synchronous cylinder, and a linkage control module (with a limit switch linked to the second drive component 51), can achieve stable power output and precise synchronization of actions. After sealing, the control system triggers the extension-side solenoid valve, and the regulated gas pushes the cylinder piston rod to extend, causing the blade to cut the centerline between the packaging bag and the film tube 23 at a uniform speed. After cutting, the solenoid valve is switched, and the gas pushes the piston rod to retract, resetting the blade. The limit switch ensures that the time difference between cutting and sealing actions is within a small range, making it suitable for high-speed production lines.

[0047] As an alternative implementation, the membrane tube forming assembly 30 includes a forming element that is frustum-shaped.

[0048] Specifically, the frustum-shaped structure (smaller diameter at the top and larger diameter at the bottom) has a gradually changing shape. When the film strip 22 is conveyed to the forming part, it will gradually curl up along the side of the frustum to form a film tube 23. The first packaging mechanism 40 seals the long side of the film tube 23, and the second packaging mechanism 50 seals the two short ends of the film tube 23, so that the film tube 23 is packaged into a packaging bag.

[0049] As an optional implementation, a marking component 80 is also included, which is disposed between the film belt conveying component 20 and the film tube forming component 30, and is used to mark the film belt 22.

[0050] Specifically, the marking component 80 can be a laser marking machine, a piezoelectric inkjet printer, or other existing technologies. The piezoelectric inkjet printer can be aligned with the conveying path of the film belt 22 and accurately spray packaging information such as production date and batch number onto the film belt 22.

[0051] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A packaging bag sealing device, characterized in that: include, A frame (10) is provided with a forming station, a first pressing station and a second pressing station; The film conveyor assembly (20) includes a plurality of rotatable traction rollers (21) for pulling the film belt (22) to the forming station during rotation; A membrane tube forming assembly (30) is disposed on the forming station, and the membrane tube forming assembly (30) is used to form the membrane strip (22) into a membrane tube (23); The sealing assembly includes a first sealing mechanism (40) disposed on the first pressing station and a second sealing mechanism (50) disposed on the second pressing station. The first sealing mechanism (40) includes a first driving member (41) and two opposing first hot pressing members (42). The first driving member (41) is used to drive the two first hot pressing members (42) to move towards each other so that the two first hot pressing members (42) seal the film tube (23) along a first direction. The second sealing mechanism (50) includes a second driving member (51) and two opposing second hot pressing members (52). The second driving member (51) is used to drive the two second hot pressing members (52) to move towards each other so that the two second hot pressing members (52) seal the film tube (23) along a second direction. The detection element (60) is used to detect the membrane strip (22).

2. The packaging bag sealing device according to claim 1, characterized in that: A guide assembly (70) is provided between the first pressing station and the second pressing station. The guide assembly (70) is used to guide the film tube (23) encapsulated by the first packaging mechanism (40) to the second pressing station. The guide assembly (70) includes a third driving member (71) and two guide members (72) arranged opposite to each other in a second direction. A guide gap (73) is formed between the two guide members (72). The third driving member (71) is used to drive the two guide members (72) to rotate.

3. The packaging bag sealing device according to claim 2, characterized in that: The guide interval (73) is provided with a guide plate (90) at its end along the first direction.

4. The packaging bag sealing device according to any one of claims 1-3, characterized in that: The first hot pressing component (42) includes a first pressing block, on which a first indentation portion (421) is provided, and both the first pressing block and the first indentation portion (421) extend along a first direction; the first packaging mechanism (40) and the second packaging mechanism (50) are spaced apart along the first direction.

5. The packaging bag sealing device according to claim 4, characterized in that: The second hot press (52) includes a second pressing block, on which two second indentation portions (521) are provided. Both the second pressing block and the second indentation portions (521) extend along a second direction; the two second indentation portions (521) are spaced apart along a first direction.

6. The packaging bag sealing device according to claim 5, characterized in that: A cutting blade (522) is provided between the two second indentation portions (521).

7. The packaging bag sealing device according to claim 1, characterized in that: The membrane tube forming assembly (30) includes a forming element, which is frustum-shaped.

8. The packaging bag sealing device according to claim 1, characterized in that: It also includes a marking component (80) disposed between the membrane belt conveying component (20) and the membrane tube forming component (30), the marking component (80) being used to mark the membrane belt (22).

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