Punching device for portable opening of packaging bag

Abstract

The utility model discloses a packaging bag handle opening punching device which aims at solving the problems that an existing handle opening is different in shearing mode specification, low in efficiency and inconvenient in waste treatment. The device comprises a transverse guide rail, a slidable mounting frame, a bottom die mounted on the mounting frame, and a cutting die positioned above the bottom die. The cutting die is fixed on the heating device, and the heating device can be controlled to ascend and descend. The bottom die is provided with a runway-shaped groove, the cutting die is provided with a cutting convex block matched with the runway-shaped groove, the end part of the convex block is provided with a material lacking groove with an inclined groove wall, and the groove wall extends to form a surrounding shearing opening. The device is further integrated with an air blowing and waste removing system and is connected with an air pump through an air outlet in the material shortage groove, and a waste bin communicated with the groove is arranged below the cutting die. The cutting quality is guaranteed through heating and cutting, automatic collection is achieved through air blowing and the waste bin, and the punching precision, the production efficiency and the workshop environment cleanliness are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of packaging machinery technology, and in particular to an automated device for punching handle holes on packaging bags. Background Technology

[0002] In the modern packaging industry, flexible packaging forms such as stand-up pouches, three-side seal bags, and four-side seal bags are widely used in many fields, including food, beverages, daily chemicals, and pharmaceuticals, due to their excellent sealing, portability, and display properties. To further enhance the user experience for end consumers, adding "handle openings" (or "carrying handle holes") to the top, sides, or center of these packaging bags has become a common product design. A well-designed handle opening not only allows consumers to easily lift heavier packages but also visually enhances the product's perceived quality.

[0003] However, on the packaging bag production line, how to efficiently, economically, and with high quality form this seemingly simple handle has always been a technical challenge plaguing the industry. Currently, the mainstream production processes mainly consist of the following three methods, each with its own insurmountable drawbacks:

[0004] The first method is the "pre-forming + bag making" process. This method involves pre-pressing the outline of the handle onto a roll of film using a specialized molding machine, followed by bag making and sealing. The advantage of this method is that the handle and bag body are integrally formed, resulting in high strength. However, its disadvantages are equally apparent: First, it requires a huge investment in equipment, necessitating a separate pre-pressing process and production line, making it unsuitable for small-batch, multi-variety production. Second, during subsequent bag making, filling, and sealing processes, the pre-pressed handle is prone to heat shrinkage or deformation at its edges due to high temperature and pressure, leading to inaccurate handle dimensions, irregular shapes, or even mismatch with the packaging machine's gripping mechanism, causing production interruptions.

[0005] The second method is "post-processing," which involves secondary processing on the already formed packaging bags using specialized punching equipment. This is currently the most flexible and widely used method on the market. Depending on the level of automation, it can be further divided into manual cutting and semi-automatic / fully automatic mechanical punching. Manual cutting relies entirely on operators using scissors or simple knives, making it highly dependent on human skill. Even experienced workers struggle to ensure that the size, position, and shape of hundreds or thousands of handles are completely consistent. Inconsistent handle sizes lead to frequent positioning failures of the gripping fixtures on the downstream packaging line, severely impacting production efficiency. Furthermore, the lack of control over plastic or paper waste generated from manual cutting results in it being scattered on workbenches and the floor, creating a dirty and messy workshop environment and posing hazards to 5S management and fire safety.

[0006] The third method uses general-purpose mechanical punching equipment. This type of equipment typically uses cold-pressed metal dies to punch the packaging bags. While it increases speed to some extent, significant technical bottlenecks remain. First, for composite packaging bags (such as PET / AL / PE structures), the interlayer bonding is strong and the materials are highly resilient. During cold shearing, the enormous shearing force causes the material to be subjected to intense compression and stretching at the cut, easily leading to tearing of the outer film and burrs or "bursting" of the inner aluminum foil or PE film. This not only severely affects the aesthetics of the handles but can also cause finger injuries to consumers or lead to cracking of the handles after only a few uses due to stress concentration, damaging the brand image. Second, this type of general-purpose equipment also lacks an effective waste collection mechanism. The waste from punching often accumulates around the die, requiring frequent machine shutdowns for cleaning, reducing the overall equipment uptime (OEE).

[0007] In summary, existing technologies lack a solution that can simultaneously meet the following requirements:

[0008] 1. High precision and consistency: It can ensure that the geometric dimensions, shape and position of each handle are highly uniform, meeting the stringent requirements of industrial automated production lines.

[0009] 2. Superior cutting quality: It can adapt to various composite packaging materials, achieving a clean, smooth, and burr-free cutting effect, improving product quality and safety.

[0010] 3. Automated waste management: It can collect waste generated from punching in a timely and effective manner, keep the production environment clean, and achieve continuous production.

[0011] 4. Compact structure and cost-effectiveness: The equipment structure should not be too complex, and it should have a good cost performance and be easy to integrate and promote on existing production lines.

[0012] This utility model was created precisely to address the various shortcomings and technical bottlenecks in the existing technology. Utility Model Content

[0013] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a punching device for the handle opening of packaging bags. This device aims to achieve automated, high-precision processing of the handle opening of packaging bags by integrating precise mechanical transmission, controllable hot-press cutting, and negative pressure dust extraction technology, while simultaneously solving the problem of waste disposal.

[0014] To achieve the above objectives, this utility model provides the following technical solution: a punching device for the handle opening of a packaging bag, characterized in that it includes: a horizontally placed guide rail, a mounting frame that slides along the guide rail, a bottom mold fixed on the mounting frame, and a cutting die located above the bottom mold; the cutting die is connected to a liftable heating device, the heating device being configured to heat the cutting die; a racetrack-shaped groove is formed on the upper surface of the bottom mold, and a cutting protrusion adapted to the groove is formed on the lower surface of the cutting die; the end face of the cutting protrusion... The die has a material shortage groove with inclined walls that extend to the edge of the cutting protrusion to form a continuous pointed section. Multiple pointed sections together form a circumferential shearing opening. The cutting protrusion can be inserted into the groove through the shearing opening to perform hot-press punching on the packaging bag. The material shortage groove has an air outlet connected to an external air source. A waste bin is also connected below the die and is connected to the bottom of the groove to receive and collect waste material blown in through the air outlet.

[0015] Furthermore, the heating device includes a heat-conducting block and at least one heating rod, the heating rod being inserted into the heat-conducting block, and the die being fixedly installed on the lower surface of the heat-conducting block.

[0016] Furthermore, it also includes a lifting drive mechanism, which includes a lifting seat, a lifting cylinder, and a drilling cylinder mounted on the mounting frame; the lifting seat forms a vertical guide sliding pair with the mounting frame through a guide rod; the cylinder body of the lifting cylinder is fixed on the mounting frame, and its piston rod is connected to the drilling cylinder; the piston rod of the drilling cylinder is connected to the lifting seat, and the lower end face of the lifting seat is connected to the heat-conducting block.

[0017] Furthermore, the waste bin is a shell structure with one open end, the open end of which faces the groove of the bottom mold. The bottom of the inner cavity of the waste bin is provided with a slope, and a discharge port is provided at the lowest point of the slope.

[0018] Furthermore, the mounting bracket has symmetrical sliders on both sides that cooperate with the guide rail, and the mounting bracket is driven by a transmission mechanism driven by a servo motor to reciprocate along the guide rail.

[0019] The beneficial effects of this utility model are:

[0020] 1. High precision and consistency: The design of the racetrack-shaped groove and matching die, combined with servo-driven lateral feed, ensures that the geometric dimensions and positional accuracy of each handle are highly consistent, meeting the quality requirements of large-scale industrial production.

[0021] 2. High-Quality Cut: A heating device is introduced to preheat the die, allowing it to soften the packaging material to a certain extent during cutting, achieving hot-press shearing. Compared to cold shearing, hot-press shearing effectively prevents the material's edge fibers from being forcibly torn, eliminating burrs and cracks, resulting in smooth and flat handle edges, enhancing product quality and user comfort.

[0022] 3. Automated Waste Collection: An innovative design incorporates a waste collection trough with inclined walls, linked to an air blowing system and a waste bin. Waste generated during punching is rapidly drawn into the trough under air pressure and then piped into the waste bin for centralized storage. This fully automated process completely eliminates waste splashing and scattering, significantly improving the working environment and reducing cleaning costs.

[0023] 4. Stable and efficient structure: The lifting drive mechanism adopts a dual-cylinder combination design. The lifting cylinder is responsible for the rapid reset of the die, while the punching cylinder provides precise impact force, ensuring the stability and reliability of the operation. The cooperation between the guide rail and the slider ensures smooth and stable lateral movement, improving the overall working efficiency of the equipment.

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model;

[0026] Figure 2 This is a partial three-dimensional structural view of a specific embodiment of the present utility model;

[0027] Figure 3 This is a perspective view of the heating device in a specific embodiment of the present invention;

[0028] Figure 4 This is a bottom view of the die-cutting mold in a specific embodiment of this utility model;

[0029] Figure 5 This is a cross-sectional view of the die-cutting mold in a specific embodiment of this utility model.

[0030] Explanation of reference numerals in the attached drawings: 101, guide rail; 102, mounting bracket; 103, slider; 201, bottom mold; 202, groove; 301, die; 302, cutting protrusion; 303, material gap groove; 304, air outlet; 400, heating device; 401, heat-conducting block; 402, heating rod; 500, waste bin; 501, ramp; 502, discharge port; 601, lifting seat; 602, lifting cylinder; 603, drilling cylinder; 604, guide rod. Detailed Implementation

[0031] The present invention will be described in detail below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0032] like Figure 1 — Figure 5 As shown, this embodiment discloses a punching device for the handle opening of a packaging bag. The core structure of the device includes a horizontally placed guide rail 101, which is preferably a high-strength linear slide rail. A mounting bracket 102 is slidably connected to the guide rail 101 via sliders 103 on both sides. The mounting bracket 102 is driven by a servo motor-driven lead screw and nut pair or a synchronous belt transmission mechanism, enabling it to perform precise reciprocating linear motion along the guide rail 101.

[0033] A bottom mold 201 is fixedly mounted on the upper plate of the mounting frame 102. The upper surface of the bottom mold 201 is machined with a standard racetrack-shaped groove 202 for processing the handle area of ​​the packaging bag to be processed.

[0034] At the lower part of the mounting frame 102, a precision lifting drive mechanism is provided. This mechanism includes a vertically movable lifting seat 601, which is slidably guided to the mounting frame 102 via two guide rods 604. The cylinder body of a lifting cylinder 602 is fixed to the top of the mounting frame 102, and its piston rod extends downward and is fixedly connected to the cylinder body of the punching cylinder 603. A heating device 400 is installed in the center of the bottom surface of the lifting seat 601. This double-layer cylinder structure design allows the die 301 to achieve a faster response speed and greater impact force when cutting thicker stacked packaging bags. When cutting ordinary packaging bags, the punching cylinder 603 can be activated. In the non-activated state, the die 301 can be retracted by the lifting cylinder 602, moving it away from the bottom die 201. This prevents the die 301 from getting too close to the packaging bag at the bottom die 201 and burning the packaging bag.

[0035] The die 301 is connected to the lifting base 601 via a heating device 400. The heating device 400 includes a metal heat-conducting block 401 with excellent thermal conductivity, inside which two heating rods 402 are inserted. When the heating rods 402 are energized, they can heat the heat-conducting block 401 to a preset temperature (e.g., 150℃-250℃, adjusted according to the material's melting point). The die 301 is fastened to the lower surface of the heat-conducting block 401 by bolts. The lower surface of the die 301 has an integrally formed cutting protrusion 302, the shape of which perfectly complements the racetrack-shaped groove 202 on the bottom die 201. Crucially, the end face of the cutting protrusion 302 is not solid, but rather has a material-shortage groove 303. The four side walls of the material-shortage groove 303 are all machined into slopes sloping towards the center. These sloping groove walls extend to the edge of the cutting protrusion 302, forming a sharp annular cutting edge, i.e., a shearing cut. When the heated die 301 moves downwards, the high-temperature annular cutting edge can instantly cut into the packaging bag, completing the heat-sealing edge cutting.

[0036] To enable immediate waste removal, air vents 304 are provided on the bottom wall of the waste trough 303. These air vents 304 are connected to an external air pump via flexible hoses. A waste bin 500 is suspended directly below the die 301. The waste bin 500 is a square box with an opening at the top, its opening facing the bottom of the groove 202 in the bottom die 201. The bottom inner wall of the waste bin 500 is designed as a slope 501, with a discharge port 502 at the lowest point for easy periodic waste removal.

[0037] The workflow is as follows:

[0038] The packaging bag roll is conveyed to the punching station and positioned, then remains stationary. A servo motor drives the mounting bracket 102 to move along the guide rail 101 until the groove 202 of the bottom die 201 aligns with the predetermined position for the handle opening on the packaging bag. Subsequently, the punching cylinder 603 pushes the heat-conducting block 401 and the die 301 downwards. At high temperature, the annular cutting edge of the cutting protrusion 302 cuts into the packaging bag, cutting off the excess and squeezing it into the space of the material shortage groove 303. Simultaneously, the air pump starts, and compressed air is ejected at high speed through the air outlet 304, forming a downward airflow field. The cut handle waste, under the action of this airflow, cannot scatter but is forced into the waste bin 500 below and eventually accumulates on the ramp 501. After punching is completed, the punching cylinder 603 retracts, and the lifting cylinder 602 immediately actuates, quickly raising the entire lifting platform 601 and the die 301 to a high position, awaiting the start of the next cycle.

[0039] Through the above structural design, this utility model successfully integrates precision mechanics, heat treatment, and pneumatic dust removal technology to form a highly efficient, clean, and high-quality fully automatic punching solution for packaging bag handles.

Claims

1. A punch device for a handle opening of a packaging bag, characterized in that include: A horizontally placed guide rail (101), a mounting bracket (102) that slides along the guide rail (101), a bottom mold (201) fixed on the mounting bracket (102), and a cutting die (301) located above the bottom mold (201). The die-cutting mold (301) is connected to a liftable heating device (400), which is configured to heat the die-cutting mold (301); The upper surface of the bottom mold (201) is provided with a groove (202), and the lower surface of the cutting mold (301) is provided with a cutting protrusion (302) that matches the groove (202). The cutting protrusion (302) has a material shortage groove (303) on its end face. The groove wall of the material shortage groove (303) is inclined and extends to the edge of the end face of the cutting protrusion (302) to form a continuous tip. Multiple tips together form a circumferential shearing opening. The cutting protrusion (302) can be inserted into the groove (202) through the cutting port to perform hot pressing punching on the packaging bag; The material shortage groove (303) is provided with an air outlet (304), which is connected to an external air source; a waste bin (500) is also connected below the die (301), which is connected to the bottom of the groove (202) to receive and collect the waste material blown in through the air outlet (304).

2. The packaging bag carrying handle punch apparatus according to claim 1, wherein The heating device (400) includes a heat-conducting block (401) and at least one heating rod (402), the heating rod (402) being inserted into the heat-conducting block (401), and the die (301) being fixedly installed on the lower surface of the heat-conducting block (401).

3. The packaging bag handle punch apparatus according to claim 2, wherein It also includes a lifting drive mechanism, which includes a lifting seat (601), a lifting cylinder (602), and a drilling cylinder (603) mounted on the mounting frame (102). The lifting seat (601) forms a vertical guide sliding pair with the mounting frame (102) through a guide rod (604). The cylinder body of the lifting cylinder (602) is fixed on the mounting frame (102), and its piston rod is connected to the drilling cylinder (603). The piston rod of the drilling cylinder (603) is connected to the lifting seat (601), and the lower end face of the lifting seat (601) is connected to the heat-conducting block (401).

4. The packaging bag carrying handle punch apparatus of claim 1, wherein The waste bin (500) is a shell structure with one open end, and its open end faces the groove (202) of the bottom mold (201). The bottom of the inner cavity of the waste bin (500) is provided with a ramp (501), and the lowest point of the ramp (501) is provided with a discharge port (502).

5. The packaging bag carrying handle punch apparatus of claim 1 wherein, The mounting bracket (102) has symmetrical sliders (103) on both sides that cooperate with the guide rail (101). The mounting bracket (102) is driven by a transmission mechanism driven by a servo motor and moves back and forth along the guide rail (101).

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