A continuous roll bag making machine for producing express delivery bags

Abstract

This utility model discloses a continuous roll bag making machine for producing express delivery bags, including a main rotating frame. A double-layer plastic film cutting mechanism is installed at the end of the main rotating frame. The double-layer plastic film cutting mechanism includes two sets of sliding rods and sliding wheels arranged on both sides of the main rotating frame. Sliding rods are slidably connected to the sliding rods and sliding wheels. A connecting plate is installed on the top of the two sliding rods. A blade holder is connected to the bottom of the connecting plate. A cutting blade is installed at the bottom of the blade holder. The main rotating frame is horizontally rotatably connected to a rotating shaft located at the bottom of the sliding rods. First eccentric wheels are connected to both ends of the rotating shaft, and two second eccentric wheels are connected to its surface. A fixing plate is installed between the main rotating frames. Two pairs of sliding rod seats are vertically installed on one side of the fixing plate. A sliding rod is slidably arranged on each pair of sliding rod seats. A pulley is installed at the bottom of the sliding rod. A cutting plate is installed on the top of the two pairs of sliding rod seats. This effectively solves the problem of stretching or wrinkling of the bottom layer of plastic film caused by cutting the double-layer plastic film downwards.

Description

Technical Field

[0001] This utility model relates to the field of packaging machinery technology, and in particular to a continuous roll bag making machine for producing express delivery bags. Background Technology

[0002] Continuous roll bag making machines are key equipment for producing widely used continuous roll vest bags and express delivery bags in daily life. Their production process typically includes feeding, guiding, sealing, and cutting. Among these, the efficiency and quality of the cutting process directly affect the quality of the final product and the speed of the production line.

[0003] Most existing bag-making machines use a single moving-blade downward-cutting structure, where only the upper cutter reciprocates up and down, while the lower platform or blade holder remains fixed. This structure has significant drawbacks: First, for double-layer plastic film, the impact force of the unidirectional downward cut can easily cause the bottom layer of plastic film to stretch or wrinkle due to insufficient tension, resulting in incomplete cutting, burrs, or material sticking. Second, the huge unidirectional impact force causes severe wear on the blade and drive components, resulting in high equipment noise and a short lifespan. In addition, the cutting process and film feeding require precise coordination; otherwise, positioning errors can easily occur, affecting the consistency of bag dimensions. Utility Model Content

[0004] To address the problems mentioned above, this utility model provides a continuous roll bag making machine for the production of express delivery bags, which effectively solves the problem that the bottom layer of plastic film is stretched or wrinkled due to insufficient tension when cutting double-layer plastic film in a single downward direction, resulting in incomplete cutting.

[0005] This utility model adopts the following technical solution: a continuous roll bag making machine for producing express delivery bags, comprising a main rotating frame, with conveying extrusion rollers installed at the upper and lower ends of the main rotating frame, and a double-layer plastic film cutting mechanism installed at the end of the main rotating frame on one side of the conveying extrusion rollers. The double-layer plastic film cutting mechanism includes two sets of sliding rods and sliding wheels arranged on both sides of the main rotating frame, with sliding rods slidably connected to the sliding rods and sliding wheels. A connecting plate is installed on the top of both sliding rods, and a blade holder is connected to the bottom of the connecting plate. A blade holder is installed at the bottom of the blade holder. The cutting blade has a main rotating frame located at the bottom of the sliding rod, which is laterally rotatably connected to a rotating shaft. Both ends of the rotating shaft are connected to first eccentric wheels, and two second eccentric wheels are connected to its surface. The bottom of the sliding rod is hinged to the corresponding first eccentric wheel via a connecting rod. A fixing plate is installed between the main rotating frames. Two pairs of sliding rod seats are vertically installed on one side of the fixing plate. A sliding rod is slidably mounted on each pair of sliding rod seats. A pulley is installed at the bottom of the sliding rod, and the pulley is always in contact with the edge of the second eccentric wheel. A cutting plate is installed on the top of the two pairs of sliding rod seats.

[0006] Furthermore, a double-layer plastic film placement roller is installed at the first end of the main rotating frame, and several transmission rollers for guiding and stretching the double-layer plastic film are installed on the main rotating frame.

[0007] Furthermore, the rotating shaft is driven by a geared motor, which is connected to one end of the rotating shaft via a synchronous belt or coupling, and one end of one of the conveying extrusion rollers is connected to a drive motor.

[0008] Furthermore, the cutting blade is an electrothermal cutting blade, which has an internal heating wire and is electrically connected to an external temperature controller via a wire.

[0009] Furthermore, the two second eccentric wheels are symmetrically arranged with respect to the center of the rotation axis, and their eccentric direction forms a 180-degree angle with the eccentric direction of the first eccentric wheel.

[0010] The advantages of this invention are as follows: The core lies in the use of a single-axis double-eccentric wheel assembly to synchronously drive the upper cutting blade and the lower cutting plate in opposite phase reciprocating motions. This "bidirectional cutting" mode cancels out the cutting forces, avoiding film stretching and wrinkling, resulting in a neater, burr-free cut surface, completely solving the material continuity problem, and significantly improving product yield. By using a geared motor to uniformly drive the cutting mechanism and coordinating with the drive motor of the conveying extrusion rollers, the entire process from film conveying and sealing to fixed-length cutting is automated. The cutting action is precisely matched with the film's forward movement rhythm, ensuring consistent bag dimensions and allowing the equipment to operate stably at higher speeds, effectively improving production efficiency. Due to the symmetrical eccentric wheel design and sliding guide structure, the movement trajectories of the moving and stationary blades are precisely controllable. The cutting mode transforms the enormous unidirectional impact force into a balanced interaction force within the system, greatly reducing equipment vibration, operating noise, and impact wear on key components such as the blades and bearings, thereby extending the overall machine's service life. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the double-layer plastic film cutting mechanism of this utility model.

[0012] In the figure, 1-main rotating frame, 2-double-layer plastic film placement roller, 3-transmission roller, 4-transfer extrusion roller, 5-double-layer plastic film cutting mechanism, 501-sliding rod and sliding wheel, 502-sliding rod, 503-connecting plate, 504-blade holder, 505-cutting blade, 506-rotating shaft, 507-first eccentric wheel, 508-second eccentric wheel, 509-sliding rod holder, 510-sliding rod, 511-pulley, 512-cutting plate, 6-fixing plate. Detailed Implementation

[0013] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0014] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 utility model.

[0015] See Figure 1-2 As shown, a continuous roll bag making machine for producing express delivery bags includes a main rotating frame 1. Conveying extrusion rollers 4 are installed at the top and bottom of each end of the main rotating frame 1. A double-layer plastic film cutting mechanism 5 is installed at one side of the conveying extrusion rollers 4 at the end of the main rotating frame 1. The double-layer plastic film cutting mechanism 5 includes two sets of sliding rods and sliding wheels 501 arranged on both sides of the main rotating frame 1. Sliding rods 502 are slidably connected to the sliding rods and sliding wheels 501. A connecting plate 503 is installed on the top of both sliding rods 502. A blade holder 504 is connected to the bottom of the connecting plate 503. A cutting blade 505 is installed at the bottom of the blade holder 504. The main rotating frame... A rotating shaft 506 is horizontally rotatably connected to the bottom of the sliding rod 502. The two ends of the rotating shaft 506 are connected to the first eccentric wheel 507, and two second eccentric wheels 508 are connected to its surface. The bottom of the sliding rod 502 is hinged to the corresponding first eccentric wheel 507 through a connecting rod. A fixing plate 6 is installed between the main body and the rotating frame 1. Two pairs of sliding rod seats 509 are vertically installed on one side of the fixing plate 6. A sliding rod 510 is slidably arranged on each pair of sliding rod seats 509. A pulley 511 is installed at the bottom of the sliding rod 510. The pulley 511 is always in contact with the edge of the second eccentric wheel 508. A cutting plate 512 is installed on the top of the two pairs of sliding rod seats 509.

[0016] The main rotating frame 1 is equipped with a double-layer plastic film placement roller 2 at its front end, and several transmission rollers 3 are installed on the main rotating frame 1 to guide and stretch the double-layer plastic film, thus clarifying the complete technical chain from feeding, guiding tensioning to final cutting.

[0017] The rotating shaft 506 is driven by a geared motor, which is connected to one end of the rotating shaft 506 via a synchronous belt or coupling. It can provide a stable and speed-controllable torque to ensure that the rhythm and force of the cutting action are constant. This is crucial to ensuring the consistency of the quality of each cut. One of the conveying extrusion rollers 4 is connected to a drive motor at one end.

[0018] The 505 cutting blade is an electrothermal cutting blade with an internal heating wire that is electrically connected to an external temperature controller via a wire. While cutting the plastic film, the high temperature instantly melts the plastic at the cut, creating a smooth, sealed edge. This completely eliminates burrs and fiber fraying, making it particularly suitable for plastic film materials that easily produce plastic shavings, and significantly improving the sealing quality of express delivery bags.

[0019] The two second eccentric wheels 508 are symmetrically arranged with respect to the center of the rotating shaft 506, and their eccentric direction forms a 180-degree angle with the eccentric direction of the first eccentric wheel 507. This ensures that every cutting action is absolutely reliable and effective, and is the core design feature that guarantees the long-term stable operation of the mechanism.

[0020] Working Principle: The double-layer plastic film unfolds from the double-layer plastic film placement roller 2, and is guided and tensioned by multiple transmission rollers 3, then fed between the upper and lower opposing conveying extrusion rollers 4 at the ends. The conveying extrusion rollers 4 rotate under the drive of a motor, providing forward power to the plastic film and determining the conveying length. When the plastic film reaches the predetermined length, the reduction motor starts, driving the rotating shaft 506 to rotate via a synchronous belt or coupling. The first eccentric wheel 507, fixed at both ends of the rotating shaft, rotates accordingly, pushing two sliding rods 502 through a connecting rod. Under the constraint of the sliding rod sliding wheel 501, the two sliding rods 502 perform precise vertical reciprocating motion, thereby driving the upper cutting blade 505 to cut downwards and rise. Simultaneously with the rotation of the rotating shaft 506, the two second eccentric wheels 508 fixed on it rotate synchronously. Since the eccentric direction of the second eccentric wheel is at a 180-degree angle to the first eccentric wheel, when the first eccentric wheel pushes the moving blade to its lowest point, the second eccentric wheel precisely pushes the sliding rod 510 to its highest point. The pulley 511 at the bottom of the slide bar is always in contact with the edge of the second eccentric wheel, and the cutting plate 512 at the top of the slide bar moves vertically in the opposite direction to the cutting blade 505. That is, when the cutting blade cuts downwards, the cutting plate rises simultaneously, and the two meet midway to complete a clean cut. After the cut is completed, the rotating shaft 506 continues to rotate, and the cutting blade 505 returns to its original position upwards under the drive of the eccentric wheel and connecting rod, while the cutting plate 512 returns to its original position downwards under the action of the eccentric wheel and gravity. The conveying extrusion roller 4 then starts, sending out the cut single express bag and conveying the next section of plastic film, entering the next work cycle.

[0021] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0022] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A continuous roll bag making machine for producing express delivery bags, comprising a main rotating frame (1), characterized in that: The main rotating frame (1) is equipped with conveying extrusion rollers (4) at the top and bottom of its ends. A double-layer plastic film cutting mechanism (5) is installed at the end of the main rotating frame (1) on one side of the conveying extrusion rollers (4). The double-layer plastic film cutting mechanism (5) includes two sets of sliding rods and sliding wheels (501) arranged on both sides of the main rotating frame (1). Sliding rods (502) are slidably connected to the sliding rods and sliding wheels (501). A connecting plate (503) is installed on the top of the two sliding rods (502). A blade holder (504) is connected to the bottom of the connecting plate (503). A cutting blade (505) is installed at the bottom of the blade holder (504). The main rotating frame (1) is located horizontally at the bottom of the sliding rods (502). A rotating shaft (506) is rotatably connected. Both ends of the rotating shaft (506) are connected to a first eccentric wheel (507), and two second eccentric wheels (508) are connected to its surface. The bottom of the sliding rod (502) is hinged to the corresponding first eccentric wheel (507) through a connecting rod. A fixing plate (6) is installed between the main rotating frame (1). Two pairs of sliding rod seats (509) are vertically installed on one side of the fixing plate (6). A sliding rod (510) is slidably arranged on each pair of sliding rod seats (509). A pulley (511) is installed at the bottom of the sliding rod (510). The pulley (511) is always in contact with the edge of the second eccentric wheel (508). A cutting plate (512) is installed on the top of the two pairs of sliding rod seats (509).

2. The continuous roll bag making machine for producing express delivery bags according to claim 1, characterized in that: The main rotating frame (1) is equipped with a double-layer plastic film placement roller (2) at its first end, and a number of transmission rollers (3) for guiding the stretching of the double-layer plastic film are installed on the main rotating frame (1).

3. A continuous roll bag making machine for producing express delivery bags according to claim 2, characterized in that: The rotating shaft (506) is driven by a geared motor, which is connected to one end of the rotating shaft (506) via a synchronous belt or coupling. One end of the conveying extrusion roller (4) is connected to a drive motor.

4. A continuous roll bag making machine for producing express delivery bags according to claim 3, characterized in that: The cutting blade (505) is an electrothermal cutting blade, which has an internal heating wire and is electrically connected to an external temperature controller via a wire.

5. A continuous roll bag making machine for producing express delivery bags according to claim 4, characterized in that: The two second eccentric wheels (508) are symmetrically arranged with respect to the center of the rotating shaft (506), and their eccentric direction forms a 180-degree angle with the eccentric direction of the first eccentric wheel (507).

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