Vertical packaging machine

Abstract

The utility model provides a vertical packaging machine and relates to the technical field of packaging machines, a packaging bag feeding assembly and a forming device are installed on the portion, above a working table top, of a rack of the vertical packaging machine, and a material pulling assembly, a back sealing assembly and a transverse sealing and cutting assembly are sequentially installed below the working table top from top to bottom. The bottom face of a U-shaped groove body of the forming device is perpendicular to the working table top, and the forming device is used for folding and forming a packaging bag film conveyed by the packaging bag feeding assembly and conveying the packaging bag film vertically downwards. A roller of the material pulling assembly is arranged below the U-shaped groove body and located on one side of an opening of the U-shaped groove body. The two rollers are meshed with each other and clamp a heat sealing edge of a packaging bag film; the sides, facing the U-shaped groove body, of the idler wheels rotate upwards by a preset angle, so that the meshing line of the two idler wheels deflects, and the plane formed by deflection of the meshing line is perpendicular to the working table top and the bottom face of the U-shaped groove body at the same time. The deviation problem of a packaging bag film can be corrected, and the packaging quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging machines, in particular to a vertical packaging machine. Background Art

[0002] Vertical packaging machine is a common packaging machine, usually including bag making device, film pulling mechanism, longitudinal sealing mechanism and transverse sealing mechanism. Vertical packaging machine generally uses the weight of materials to fall into the bag, so it often uses lapel former or elephant trunk former to form the packaging film. Both of these formers are easy to cause the film to deviate inwards, and one former can only form bags of the same width. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a vertical packaging machine, including: a frame, a work surface is horizontally installed on the frame, a packaging bag feeding assembly and a former are installed above the work surface, and a tearing assembly, a back sealing assembly and a transverse sealing and cutting assembly are installed in sequence from top to bottom below the work surface.

[0004] The former comprises a U-shaped trough body, the bottom surface of which is perpendicular to the work surface, and the U-shaped trough body is used to fold and shape the packaging bag film transmitted by the packaging bag feeding assembly, and transmit it vertically downward.

[0005] The material pulling assembly includes a pair of rollers, which are arranged below the U-shaped groove body and on one side of the opening of the U-shaped groove body; the two rollers mesh with each other and clamp the heat-sealed edge of the packaging bag film; the rollers rotate upward at a preset angle toward one side of the U-shaped groove body, causing the meshing line of the two rollers to deflect, and the plane formed by the deflection of the meshing line is perpendicular to the work table and the bottom surface of the U-shaped groove body at the same time.

[0006] Furthermore, the preset angle is 5 to 15 degrees.

[0007] Furthermore, the material pulling assembly includes a mounting plate and an angle adjustment block, the roller is mounted on the mounting plate, and the axis is perpendicular to the mounting plate; the mounting plate is mounted between two columns of the frame, there are two angle adjustment blocks, which are respectively mounted on the two columns, and the angle adjustment block is equipped with a number of extension bolts that lean against the mounting plate, and the extension bolts are used to adjust the preset angle.

[0008] Furthermore, the roller includes a driving roller and a driven roller, the driving roller is fixedly mounted on the mounting plate and is connected to a motor; a transverse slide groove is opened on the mounting plate, and the driven roller is movably mounted in the transverse slide groove through a slider, and a cam spring mechanism is arranged between the slider and the mounting plate, and the cam spring mechanism is used to drive the slider to move in the transverse slide groove.

[0009] Furthermore, there are two groups of material pulling components, which are respectively arranged at the upper and lower ends of the back sealing component.

[0010] Furthermore, the rollers have teeth that mesh with each other.

[0011] Furthermore, the former also includes a trapezoidal wing plate, which is arranged on the top of the U-shaped trough body, with the short side of the trapezoidal wing plate facing upward, and two side plates of the U-shaped trough body are chamfered at the top.

[0012] Furthermore, the packaging bag feeding assembly includes a plurality of unpowered tensioning rollers and an active roller, and the installation height of the active roller is lower than the trapezoidal wing plate.

[0013] Furthermore, the former also includes a pair of side baffles arranged below the U-shaped trough body, and the distance between the two side baffles is adjustable.

[0014] Furthermore, the side baffle includes a first baffle surface and a second baffle surface. The first baffle surface is parallel to the bottom surface of the U-shaped groove body and is provided with a horizontal long strip bolt hole. The second baffle surface is parallel to the plane formed by the deflection of the meshing line and is used to limit the forming width of the packaging bag film.

[0015] The beneficial effect of the utility model is that the utility model rotates the roller of the material pulling component downward so that the meshing line of the two rollers has a preset angle with the vertical direction, and the friction force of the roller on the packaging bag film is perpendicular to the meshing line, so the packaging bag film is subjected to an inclined inward force, which can offset the internal stress of the packaging bag film itself that deviates outward, thereby improving the processing quality of the vertical packaging machine. In addition, the utility model folds and forms the packaging bag film through a former with a U-shaped groove body, and can process packaging bags of different width specifications, thereby improving the scope of application of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a vertical packaging machine according to an embodiment of the utility model;

[0017] Figure 2 A schematic diagram of the rotation of the roller in an embodiment of the utility model;

[0018] Figure 3 This is a schematic diagram of the installation of the angle adjustment block of an embodiment of the utility model;

[0019] Figure 4 This is a structural schematic diagram of a material pulling assembly according to an embodiment of the utility model;

[0020] Figure 5 This is a schematic structural diagram of a driven roller according to an embodiment of the utility model;

[0021] Figure 6 It is a structural schematic diagram of a former according to an embodiment of the utility model;

[0022] Figure 7 This is a structural schematic diagram of a packaging bag feeding assembly according to an embodiment of the utility model;

[0023] Figure 8 This is a schematic diagram of the installation of the side baffle of an embodiment of the utility model;

[0024] Fig. 9 It is a schematic structural diagram of the side baffle of an embodiment of the utility model.

[0025] Among them, 1: frame; 2: packaging bag feeding assembly; 3: former; 4: material tearing assembly; 5: back seal assembly; 6: transverse seal cutting assembly; 7: packaging bag film; 8: side baffle; 9: packaging product; 11: work surface; 12: column; 21: non-powered tensioning roller; 22: active roller; 23: packaging bag material roll; 31: U-shaped groove body; 32: trapezoidal wing plate; 41: roller; 42: mounting plate; 43: angle adjustment block; 44: top extension bolt; 45: motor; 46: transverse slide groove; 47: slider; 48: cam spring mechanism; 49: handle; 411: active roller; 412: driven roller; 81: first blocking surface; 82: second blocking surface; 83: long strip bolt hole. DETAILED DESCRIPTION

[0026] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0029] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0030] like Figure 1 The vertical packaging machine provided in this embodiment comprises: a frame 1, a work surface 11 is horizontally mounted on the frame 1, a packaging bag feeding assembly 2 and a former 3 are mounted above the work surface 11, and a material tearing assembly 4, a back sealing assembly 5 and a transverse sealing cutting assembly 6 are sequentially mounted below the work surface 11 from top to bottom.

[0031] The frame 1 is used to install and support various components. The working platform is set on the frame 1. The upper part of the working platform is used to install the packaging bag feeding component 2 and the former 3. The lower part is installed with the tearing component 4, the back sealing component 5 and the transverse sealing and cutting component 6 through the column 12. The working platform between the former 3 and the tearing component 4 is provided with a hole for accommodating the packaging bag film 7 to pass through. A transfer box can also be set below the transverse sealing and cutting component 6. The transfer box is used to receive the packaged product 9 after the packaging is completed. The packaging bag feeding component 2 is used to install the packaging bag roll film, and unwind the packaging bag roll 23 and transfer it to the former 3. The former 3 is used to fold the packaging bag film 7 and guide it vertically downward. The folded packaging bag film 7 has a certain internal stress and is easy to deviate and needs to be corrected. The tearing component 4 is used to clamp the two heat-sealed edges of the packaging bag film 7 and apply a downward moving force to the packaging bag film 7. The back sealing component 5 is used to heat-seal the heat-sealed edges on both sides of the packaging bag film 7 into a whole, so that the packaging bag film 7 forms a roll-shaped structure. The transverse sealing and cutting assembly 6 is used to heat-seal the roll-shaped packaging bag film 7 transversely and cut it transversely. Before transverse heat-sealing, the material to be packaged can be injected into it to complete the packaging of the material and obtain a packaged product 9.

[0032] The former 3 comprises a U-shaped trough body 31 , the bottom surface of which is perpendicular to the work surface 11 , and the U-shaped trough body 31 is used to fold and shape the packaging bag film 7 transmitted by the packaging bag feeding assembly 2 , and transmit it vertically downward.

[0033] The U-shaped groove body 31 includes a bottom plate, and a side plate is provided on both sides of the bottom plate. The former 3 with the U-shaped groove body 31 can make packaging bags of different sizes. Preferably, the distance between the two side plates of the U-shaped groove body 31 is adjustable, which further increases the size range of packaging bags that can be made by the former 3. The U-shaped groove body 31 is vertically arranged, and the upper and lower ends are the inlet and outlet of the packaging bag film 7 respectively. The opening of the side of the U-shaped groove body 31 is arranged toward the side where other components are installed, so as to facilitate matching.

[0034] The material pulling assembly 4 includes a pair of rollers 41, which are arranged below the U-shaped groove body 31 and on one side of the opening of the U-shaped groove body 31; the two rollers 41 are meshed with each other and clamp the heat-sealed edge of the packaging bag film 7; the rollers 41 are rotated upward by a preset angle toward one side of the U-shaped groove body 31, so that the meshing line of the two rollers 41 is deflected, and the plane formed by the deflection of the meshing line is perpendicular to the work table 11 and the bottom surface of the U-shaped groove body 31 at the same time.

[0035] Among them, Figure 2 The figure is a schematic diagram of the rotation of the roller in this embodiment. To better illustrate the beneficial effects of this embodiment, a coordinate system is established with the paper surface as the Z plane, the horizontal right direction as the positive direction of the X axis, and the vertical upward direction as the positive direction of the Y axis. The ideal transmission direction of the packaging bag film 7 after folding by the former 3 is vertically downward. However, the packaging bag film 7 after curling and folding has a certain internal stress. According to experience, it is easy to deviate toward the tearing component 4, that is, toward the negative direction of the X axis. Therefore, the transmission direction of the packaging bag film 7 needs to be corrected. In this embodiment, the roller 41 rotates upward toward one side of the U-shaped groove body 31, that is, the roller 41 rotates upward at Figure 2 The roller 41 rotates counterclockwise on the paper, and when the two rollers 41 rotate together, the meshing line of the two rollers will rotate together. The roller 41 is cylindrical, and its axis is parallel to the meshing line. The angle θ between the perpendicular line of the meshing line and the vertical direction can be seen in the Z plane, and the angle θ is the preset angle. The force applied by the roller 41 to the packaging bag film 7 is perpendicular to the meshing line and downward. When the force is decomposed into the X-axis and the Y-axis, the component force in the positive direction of the X-axis can be obtained, so the internal stress of the packaging bag film 7 in the negative direction of the X-axis can be corrected, and the packaging bag film 7 is guided to be transmitted vertically downward.

[0036] In summary, this embodiment can solve the problems in the prior art that the packaging bag film 7 of the vertical packaging machine is prone to deviate inwards and one former 3 can only form packaging bags of the same width, thereby improving the packaging quality and scope of application of this embodiment.

[0037] In this embodiment, the preset angle is 5 to 15 degrees.

[0038] The internal stress of the packaging bag film 7 in the negative direction of the X-axis varies with factors such as the material, thickness and length of the packaging bag film 7, and the preset angle can be set according to the degree of deviation of the packaging bag film 7 in the negative direction of the X-axis. Preferably, the preset angle is 8 to 13 degrees.

[0039] In this embodiment, the material pulling assembly 4 includes a mounting plate 42 and an angle adjustment block 43, the roller 41 is mounted on the mounting plate 42, and the axis is perpendicular to the mounting plate 42; the mounting plate 42 is mounted between two columns 12 of the frame 1, there are two angle adjustment blocks 43, which are respectively mounted on the two columns 12, and the angle adjustment blocks 43 are equipped with a plurality of extension bolts 44 that lean against the mounting plate 42, and the extension bolts 44 are used to adjust the preset angle.

[0040] Among them, Figure 3 , which is a schematic diagram of the installation of the angle adjustment block. The angle adjustment block 43 is preferably in the shape of an angle iron. One surface of the angle adjustment block 43 is fixed to the column 12, and the other surface of the angle adjustment block 43 faces the mounting plate 42. The mounting plate 42 is mounted on the column 12 by two sets of adjustable screws. The surface of the angle adjustment block 43 facing the mounting plate 42 is provided with a top extension bolt 44 for adjusting the angle of the mounting plate 42, as shown in FIG. Figure 3 As shown, the top extension bolts 44 are arranged in the vertical direction, and the depths of the upper and lower top extension bolts 44 against the mounting plate 42 are different, so that the mounting plate 42 can be rotated. By controlling the depth of the top extension bolts 44 against the mounting plate 42, the size of the preset angle can be adjusted. In this embodiment, the roller 41 is installed on the mounting plate 42, and then the inclination angle of the mounting plate 42 is adjusted by the top extension bolts 44 to rotate the meshing line of the roller 41, so as to adjust the preset angle. In addition, the top extension bolts 44 are easy to adjust, and the preset angle can be quickly fine-tuned according to the front and rear offset of the packaging bag film 7, thereby improving the convenience of this embodiment. The roller 41 is fixed on the mounting plate 42 as a whole, and rotates with the mounting plate 42, which can improve the installation stability of the roller 41.

[0041] In this embodiment, if Figure 4 As shown in FIG. 1 , it is a schematic diagram of the structure of the material pulling assembly. The roller 41 includes a driving roller 411 and a driven roller 412. The driving roller 411 is fixedly mounted on the mounting plate 42 and is connected to a motor 45. Figure 5 As shown, it is a schematic diagram of the structure of the driven roller, a transverse groove 46 is provided on the mounting plate 42, and the driven roller 412 is movably installed in the transverse groove 46 through a slider 47, and a cam spring mechanism 48 is provided between the slider 47 and the mounting plate 42, and the cam spring mechanism 48 is used to drive the slider 47 to move in the transverse groove 46.

[0042] The transverse slide groove 46 is arranged on the side of the mounting plate 42 facing away from the U-shaped groove body 31, the slider 47 is plate-shaped and is installed in the transverse slide groove 46, and a pressure plate is fixed on the mounting plate 42 to limit the slider 47 in the transverse slide groove 46. A through hole is opened at one end of the transverse slide groove 46 to accommodate the installation of the driven roller 412. The driven roller 412 is installed on the slider 47 through a bearing and can move with the slider 47. The cam spring mechanism 48 includes a spring, a cam and a handle 49 connected to the cam. The spring is arranged in a spring groove on a mounting plate 42, and the spring groove is connected to the transverse slide groove 46. The two ends of the spring are connected to the slider 47 and the mounting plate 42, and are used to push the slider 47 to move to one side of the active roller 411. The slider 47 is provided with a cam hole that cooperates with the cam at a corresponding position. When the cam rotates, the slider 47 can be pushed to move along the transverse slide groove 46 by cooperating with the cam hole, thereby realizing the rapid opening and closing of the driven roller 412 and the active roller 411, which is convenient for manual installation or replacement of the packaging bag film 7. The handle 49 is provided on the side of the mounting plate 42 facing the U-shaped groove body 31, and a through hole for installing the handle 49 is provided at a corresponding position of the mounting plate 42. The handle 49 is fixedly connected to the cam, and the rotation of the cam is controlled by rotating the handle 49.

[0043] In this embodiment, there are two groups of material pulling components 4, which are respectively arranged at the upper and lower ends of the back sealing component 5.

[0044] Among them, using two sets of material pulling components 4 can further tighten the packaging bag film 7 between the back sealing components 5, so that the packaging bag film 7 is pulled flat, and the heat-sealed edge of the packaging bag film 7 can be straightened, which is convenient for the back sealing component 5 to work. In addition, the packaging bag film 7 becomes cylindrical after the back sealing is completed, and the internal stress will change, which may further cause the problem of deviation. The material pulling component 4 above the transverse sealing cutting component 6 can adjust according to the direction and degree of deviation of the packaging bag film 7 after the back sealing, correct the packaging bag film 7, and further improve the packaging quality.

[0045] In this embodiment, the rollers 41 have teeth that mesh with each other.

[0046] The surface of the roller 41 has teeth that can mesh with each other, which can increase the friction on the packaging bag film 7 and prevent the packaging bag film 7 from moving during the back sealing or transverse sealing process. The tooth shape can be any tooth shape that can increase the friction, and preferably the depth of the tooth shape is less than or equal to 2 mm.

[0047] In this embodiment, if Figure 6 As shown, it is a schematic diagram of the structure of the former in this embodiment. The former 3 also includes a trapezoidal wing plate 32, which is arranged on the top of the U-shaped groove body 31, with the short side of the trapezoidal wing plate 32 facing upward, and the two side plates of the U-shaped groove body 31 are chamfered at the top.

[0048] Among them, the trapezoidal wing plate 32 can support both sides of the packaging bag film 7 to prevent the two sides of the packaging bag film 7 from curling inward, thereby reducing the problem of left-right deviation and jamming of the packaging bag film 7 in the former 3. In addition, the trapezoidal wing plate 32 is longer and can support a wider film, so that this embodiment can be made into packaging bags of different widths, thereby improving the scope of application. The chamfer can be designed according to the shape of the trapezoidal wing plate 32, which is used to support both sides of the packaging bag film 7 and flip it to form.

[0049] In this embodiment, as shown in FIG7 , it is a schematic diagram of the structure of the packaging bag feeding assembly in this embodiment. The packaging bag feeding assembly 2 includes a plurality of unpowered tensioning rollers 21 and an active roller 22 , and the installation height of the active roller 22 is lower than the trapezoidal wing plate 32 .

[0050] The unpowered tensioning roller 21 is used to unwind the packaging bag material roll 23 to obtain a single-layer packaging bag film 7, and exert a certain friction force on it to make it tensioned. The active roller 22 is arranged below the trapezoidal wing plate 32, which can further tension the packaging bag film 7 and keep the packaging bag film 7 flat.

[0051] In this embodiment, as shown in FIG. 8 , which is a schematic diagram of the installation of the side baffles in this embodiment, the former 3 also includes a pair of side baffles 8 arranged below the U-shaped groove body 31, and the distance between the two side baffles 8 is adjustable.

[0052] The side baffle 8 protects the material tearing assembly 4, the back seal assembly 5 and the transverse seal cutting assembly 6, and also protects the packaging bag film 7. As shown in the figure, a bracket for supporting the side baffle 8 is installed on the column 12, and the side baffle 8 is installed on the bracket by bolts.

[0053] In this embodiment, the side baffle 8 includes a first baffle surface 81 and a second baffle surface 82. The first baffle surface 81 is parallel to the bottom surface of the U-shaped groove body 31, and a horizontal long strip bolt hole 83 is opened on the first baffle surface 81; the second baffle surface 82 is parallel to the plane formed by the deflection of the meshing line, and is used to limit the forming width of the packaging bag film 7.

[0054] Among them, Fig. 9 FIG. 1 is a schematic diagram of the structure of the side baffle, wherein the first baffle surface 81 is used to protect the components below the work surface 11, and the second baffle surface 82 can block the packaging bag film 7, thereby limiting the forming width of the packaging bag film 7. The side baffle 8 is installed on the column 12 through the long strip bolt hole 83, and the distance between the second baffle surfaces 82 of the two side baffles 8 can be adjusted by adjusting the position of the bolt in the long strip bolt hole 83, thereby adapting to various packaging bag widths.

[0055] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A vertical packaging machine, characterized in that: include: A frame (1), wherein a work surface (11) is horizontally mounted on the frame (1), a packaging bag loading assembly (2) and a former (3) are mounted above the work surface (11), and a material tearing assembly (4), a back sealing assembly (5) and a transverse sealing cutting assembly (6) are mounted in order from top to bottom below the work surface (11); The former (3) comprises a U-shaped trough body (31), the bottom surface of the U-shaped trough body (31) being perpendicular to the work surface (11), and the U-shaped trough body (31) being used to fold and shape the packaging bag film (7) transmitted by the packaging bag feeding component (2), and to transmit it vertically downward; The material pulling assembly (4) includes a pair of rollers (41), wherein the rollers (41) are arranged below the U-shaped groove body (31) and are located on one side of the opening of the U-shaped groove body (31); the two rollers (41) mesh with each other and clamp the heat-sealed edge of the packaging bag film (7); the rollers (41) rotate upward at a preset angle toward one side of the U-shaped groove body (31), so that the meshing line of the two rollers (41) is deflected, and the plane formed by the deflection of the meshing line is perpendicular to the work surface (11) and the bottom surface of the U-shaped groove body (31).

2. The vertical packaging machine according to claim 1, characterized in that: The preset angle is 5 to 15 degrees.

3. The vertical packaging machine according to claim 2, characterized in that: The material pulling assembly (4) includes a mounting plate (42) and an angle adjustment block (43), the roller (41) is mounted on the mounting plate (42), and the axis of the roller (41) is perpendicular to the mounting plate (42); the mounting plate (42) is mounted between two columns (12) of the frame (1), there are two angle adjustment blocks (43), which are respectively mounted on the two columns (12), and the angle adjustment block (43) is installed with a plurality of extension bolts (44) that lean against the mounting plate (42), and the extension bolts (44) are used to adjust the preset angle.

4. The vertical packaging machine according to claim 3, characterized in that: The roller (41) comprises a driving roller (411) and a driven roller (412); the driving roller (411) is fixedly mounted on the mounting plate (42) and is connected to a motor (45); a transverse slide groove (46) is provided on the mounting plate (42); the driven roller (412) is movably mounted in the transverse slide groove (46) via a slider (47); a cam spring mechanism (48) is provided between the slider (47) and the mounting plate (42); the cam spring mechanism (48) is used to drive the slider (47) to move in the transverse slide groove (46).

5. The vertical packaging machine according to any one of claims 1 to 4, characterized in that: The material tearing components (4) have two groups, which are respectively arranged at the upper and lower ends of the back sealing component (5).

6. The vertical packaging machine according to claim 1, characterized in that: The rollers (41) have teeth that mesh with each other.

7. The vertical packaging machine according to claim 1, characterized in that: The former (3) further comprises a trapezoidal wing plate (32), wherein the trapezoidal wing plate (32) is arranged on the top of the U-shaped trough body (31), the short side of the trapezoidal wing plate (32) faces upward, and the two side plates of the U-shaped trough body (31) are chamfered at the top.

8. The vertical packaging machine according to claim 7, characterized in that: The packaging bag loading assembly (2) comprises a plurality of unpowered tensioning rollers (21) and an active roller (22), wherein the installation height of the active roller (22) is lower than the trapezoidal wing plate (32).

9. The vertical packaging machine according to claim 1, characterized in that: The former (3) further comprises a pair of side baffles (8) arranged below the U-shaped trough body (31), and the distance between the two side baffles (8) is adjustable.

10. The vertical packaging machine according to claim 9, characterized in that: The side baffle (8) comprises a first baffle surface (81) and a second baffle surface (82); the first baffle surface (81) is parallel to the bottom surface of the U-shaped groove body (31); a horizontal long strip bolt hole (83) is provided on the first baffle surface (81); the second baffle surface (82) is parallel to a plane formed by deflection of the meshing line; the second baffle surface (82) is used to limit the forming width of the packaging bag film (7).

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