Film drawing mechanism for auxiliary cutting of packaging bag

Abstract

The utility model relates to the technical field of packaging equipment, in particular to a film drawing mechanism for auxiliary cutting of a packaging bag, which comprises a rack, a transverse sealing part and a cutting mechanism are arranged in the rack, two film drawing groups rolling relatively are arranged between the transverse sealing part and the cutting mechanism, and rollers are respectively arranged in the two film drawing groups. The roller is connected with a rotary driving mechanism. A cylindrical packaging film is sealed through the transverse sealing part and filled with materials to form a continuous packaging bag strip, the continuous packaging bag strip enters the film pulling mechanism, at the moment, the packaging bag is extruded by the two film pulling sets, then the packaging bag is driven to regularly move downwards and enters the cutting mechanism to be cut off, and the product appearance is guaranteed; the positions entering the cutter part are relatively consistent, and the shape and the size of the cut-off position are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of packaging equipment technology, and in particular to a film-pulling mechanism for auxiliary cutting of packaging bags. Background Technology

[0002] When the transverse sealing mechanism and the cutting mechanism exist as two independent mechanisms in a packaging machine, the packaging bag is connected as a whole after passing through the transverse sealing mechanism, and then cut off by the cutting mechanism. The shape of the packaging bag is affected by factors such as the state of the material, the blowing time, and the size during the filling process. Since there is no shaping process, and the distance between the transverse sealing mechanism and the cutter is usually no less than the length of three bags, the cutting may be tilted or the cutting position may be inaccurate. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a film-pulling mechanism for auxiliary cutting of packaging bags, which addresses the above-mentioned technical deficiencies by setting a film-pulling group between the transverse sealing part and the cutting mechanism, thereby solving the problems of tilted cuts and inaccurate cutting positions of packaging bags.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a film-pulling mechanism for auxiliary cutting of packaging bags, including a frame, a transverse sealing part and a cutting mechanism are provided in the frame, and two sets of relatively rolling film-pulling groups are provided between the transverse sealing part and the cutting mechanism. Rollers are provided in the two sets of film-pulling groups, and the rollers are connected to a rotary drive mechanism.

[0005] To further optimize this technical solution, each film-pulling group includes a driving roller and a driven roller. A belt is wound around the outer periphery of the driving roller and the driven roller. One axial end of the driving roller is connected to a drive shaft. The ends of the two drive shafts away from the driving roller are connected to a rotary drive mechanism. A longitudinal sealing part with a relatively rolling structure is provided on the upper side of the transverse sealing part.

[0006] Further optimization of this technical solution includes two sets of slides, with the active and driven rollers rotating within the slides and the slides sliding relative to each other within the mounting frame. Each of the two sets of slides has a telescopic drive mechanism on its opposite side, with a universal joint coupling in the drive shaft. A limiting plate is provided between the two sets of slides, and the limiting plate is fixed to the mounting frame. A limiting screw is threaded into the slide along the sliding direction, with one end of the limiting screw contacting the limiting plate.

[0007] To further optimize this technical solution, the telescopic drive mechanism is a pneumatic telescopic cylinder. The cylinder of the pneumatic telescopic cylinder is fixedly connected to the mounting frame, and the lever end of the pneumatic telescopic cylinder is connected to the slide table. The mounting frame and the slide table are provided with sliding grooves at corresponding positions.

[0008] To further optimize this technical solution, the rotary drive mechanism includes a first pulley, a second pulley, a synchronous belt, and a drive motor. The drive motor is fixedly mounted in the mounting frame and has a drive wheel at one end of its output shaft. The first pulley and the second pulley are respectively connected to a drive shaft at one axial end. The synchronous belt is circumferentially wound between the first pulley and the drive wheel, and the second pulley is in rolling contact with the outer surface of the synchronous belt.

[0009] Compared with the prior art, this utility model has the following advantages: After the packaging bag is sealed by the longitudinal sealing part, it is filled with material at the transverse sealing part. After the tubular packaging film is sealed by the transverse sealing part and filled with material, it forms a continuous packaging bag strip and enters the film pulling mechanism. At this time, the packaging bag is squeezed by two belts, realizing the downward pulling of the packaging film. Then, it drives the packaging bag to move downward in a regular manner and enters the cutting mechanism for cutting. Since the distance between the two belts is adjusted according to the packaging requirements, the packaging bag is in a consistent state after passing through the film pulling mechanism, which ensures the product shape. Moreover, due to the clamping of the belts, the position of entering the cutting part is relatively consistent, and the shape and size of the cut are guaranteed. Attached Figure Description

[0010] Figure 1 A schematic diagram showing the installation position of a film-pulling mechanism for assisting in cutting packaging bags during use;

[0011] Figure 2 This is a schematic diagram of one side of the film-pulling assembly of a film-pulling mechanism for auxiliary cutting of packaging bags;

[0012] Figure 3 This is a schematic diagram of one side of the rotary drive mechanism of a film-pulling mechanism for auxiliary cutting of packaging bags;

[0013] Figure 4 This is a top view of a film-pulling mechanism for assisting in the cutting of packaging bags.

[0014] In the diagram: 1. Frame; 2. Transverse sealing section; 3. Film pulling mechanism; 30. Mounting frame; 301. Slide groove; 31. Film pulling assembly; 311. Driving roller; 312. Driven roller; 313. Belt; 32. Telescopic drive mechanism; 33. Rotary drive mechanism; 331. First pulley; 332. Second pulley; 333. Synchronous belt; 334. Drive motor; 3341. Driving wheel; 34. Drive shaft; 35. Slide table; 36. Limiting plate; 4. Cutting mechanism; 5. Longitudinal sealing section. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0016] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" used in this application to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are used solely for the convenience of describing this disclosure and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] Combination Figures 1 to 3 As shown, a film-pulling mechanism for auxiliary cutting of packaging bags includes a frame 1. The frame 1 is arranged longitudinally in sequence with a longitudinal sealing part 5, a transverse sealing part 2, a film-pulling mechanism 3 and a cutting mechanism 4. The film-pulling mechanism 3, located between the transverse sealing part 2 and the cutting mechanism 4, is provided with two sets of relatively rolling film-pulling groups 31. Each of the two sets of film-pulling groups 31 is provided with a roller, and the roller is connected to a rotary drive mechanism 33.

[0018] Combination Figures 2 to 3 As shown, each film-stretching group 31 includes a driving roller 311 and a driven roller 312. A belt 313 is wound around the outer periphery of the driving roller 311 and the driven roller 312. One axial end of the driving roller 311 is connected to a drive shaft 34. The ends of the two drive shafts 34 away from the driving roller 311 are connected to a rotary drive mechanism 33. The rotary drive mechanism 33 includes a first pulley 331, a second pulley 332, a synchronous belt 333, and a drive motor 334. One end of the output shaft of the drive motor 334 is provided with a driving wheel 3341. One axial end of the first pulley 331 and the second pulley 332 are respectively connected to a drive shaft 34. The synchronous belt 333 is circumferentially wound between the first pulley 331 and the driving wheel 3341. The second pulley 332 rolls in contact with the outer surface of the synchronous belt 333.

[0019] Combination Figures 2 to 4As shown, the film stretching mechanism 3 also includes two sets of slides 35. A driving roller 311 and a driven roller 312 are rotatably mounted in the slides 35. The slides 35 are slidably mounted in the mounting frame 30. In use, the film stretching mechanism 3 is fixed to the frame 1 via the mounting frame 30. Each of the two sets of slides 35 has a telescopic drive mechanism 32 on its opposite side. The telescopic drive mechanism 32 is a pneumatic telescopic cylinder. The cylinder of the pneumatic telescopic cylinder is fixedly connected to the mounting frame 30, and the lever end of the pneumatic telescopic cylinder is connected to the slide 35. The mounting frame 30 and the corresponding positions of the slides 35 have sliding grooves 301. A universal joint coupling is provided in the drive shaft 34. A limiting plate 36 is provided between the two sets of slides 35. The limiting plate 36 is fixed to the mounting frame 30. A limiting screw 37 is threadedly connected inside the slides 35 along the sliding direction, and one end of the limiting screw 37 contacts the limiting plate 36. A longitudinal sealing part 5 with a relatively rolling structure is provided on the upper side of the transverse sealing part 2.

[0020] When using, combine Figures 1 to 4 As shown, the packaging bag rolled into a cylindrical shape first achieves longitudinal sealing in the longitudinal sealing section 5 of the relatively rolling structure. The longitudinal sealing section has two functions: first, to seal the packaging film into a cylindrical shape, and second, to assist in pulling the film. Then, a transverse sealing is achieved at the transverse sealing section 2. After the transversely sealed packaging bag is filled with materials, it is cut by the cutting mechanism 4. Before cutting, the packaging bag is squeezed and pulled by two sets of relatively rolling film pulling groups 31. The pressure of the squeeze is adjusted by extending two sets of telescopic drive mechanisms 32, which drive the slide table 35 to move inward. Since the limiting plate 36 is fixed, by rotating the two limiting screws 37, since one end of the two limiting screws 37 is pressed against both sides of the limiting plate 36, the distance between the two slide tables 35 after they are clamped inward can be adjusted to ensure that the distance between the two belts 313 in the two sets of film pulling groups 31 is consistent after each extension of the telescopic drive mechanism 32. The pulling action is achieved by the rotary drive mechanism 33 driving the rollers on both sides to rotate in conjunction with the belt 313. When the rollers and belt 313 rotate, they generate a pulling friction force with the packaging bag. Combined with the upward reaction force of the longitudinal sealing part 5, this ensures that the packaging bag is taut before cutting, preventing the bag from shaking during filling or sealing. This effectively avoids phenomena such as tilted cuts and inaccurate cutting positions when the cutting mechanism 4 is in operation. When it is necessary to insert packaging film, replace the material tube, or perform maintenance, the telescopic drive mechanism 32 can be controlled to retract autonomously, increasing the operating space and making operation more convenient.

[0021] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A film pulling mechanism for assisting cutting of a packaging bag, comprising a frame (1) in which a transverse seal portion (2) and a cutting mechanism (4) are provided, characterized in that: Two groups of film pulling groups (31) are arranged between the transverse sealing part (2) and the cutting mechanism (4), and each group of the film pulling groups (31) is provided with a roller, and the roller is connected with a rotary driving mechanism (33).

2. The film pulling mechanism for assisting the cutting of a packaging bag according to claim 1, characterized in that: The roller in each group of the film pulling groups (31) comprises a driving roller (311) and a driven roller (312), a belt (313) is wound around the outer periphery between the driving roller (311) and the driven roller (312), one end of the driving roller (311) in the axial direction is connected with a driving shaft (34), and the ends of the two groups of driving shafts (34) away from the driving roller (311) are connected with the rotary driving mechanism (33). The upper side of the transverse sealing part (2) is provided with a longitudinal sealing part (5) of a relative rolling structure.

3. The film pulling mechanism for assisting the cutting of a packaging bag according to claim 2, characterized in that: Two groups of sliding tables (35) are further included, the driving roller (311) and the driven roller (312) are arranged in the sliding table (35), the sliding table (35) is arranged in the mounting frame (30) in a relative sliding manner, the two groups of sliding tables (35) are respectively provided with telescopic driving mechanisms (32) on the sides away from each other, a universal joint coupling is arranged in the driving shaft (34), a limiting plate (36) is arranged between the two groups of sliding tables (35), the limiting plate (36) is fixed with the mounting frame (30), a limiting screw rod (37) is threadedly connected in the sliding table (35) along the sliding direction, and one end of the limiting screw rod (37) is arranged in contact with the limiting plate (36).

4. The film pulling mechanism for assisting the cutting of a packaging bag according to claim 3, characterized in that: The telescopic driving mechanism (32) is a pneumatic telescopic cylinder, the cylinder of the pneumatic telescopic cylinder is fixedly connected with the mounting frame (30), the lever end of the pneumatic telescopic cylinder is connected with the sliding table (35), and the mounting frame (30) is provided with a sliding groove (301) at a position corresponding to the sliding table (35).

5. The film pulling mechanism for assisting the cutting of a packaging bag according to claim 2, characterized in that: The rotary driving mechanism (33) comprises a first pulley (331), a second pulley (332), a synchronous belt (333) and a driving motor (334), the driving motor (334) is fixedly arranged in the mounting frame (30) and provided with a driving wheel (3341) at one end of an output shaft thereof, one end of the axial direction of the first pulley (331) and the second pulley (332) is respectively connected with one of the driving shafts (34), the synchronous belt (333) is circumferentially wound between the first pulley (331) and the driving wheel (3341), and the second pulley (332) is in rolling contact with the outer belt surface of the synchronous belt (333).

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