A packaging bag slitting apparatus

Abstract

The utility model discloses a kind of packaging bag slitting equipment, it is related to packaging bag slitting technical field, including workbench, the top of workbench is equipped with frame body, the bottom of frame body is equipped with the cutter for cutting packaging bag, the top of cutter is equipped with connecting strip, the top of connecting strip is equipped with guide pillar, the end of guide pillar is equipped with connecting plate, connecting plate is displaced vertically by pneumatic cylinder, both sides of frame body are equipped with pressing mechanism, extrusion and straighten in packaging bag area in cutting by pressing mechanism, in this equipment, by setting pressing mechanism, before cutter cuts packaging bag, pressing mechanism first extrusion and straighten packaging bag in cutting area, so that packaging bag is in flat and has certain tension state when cutting, effectively avoid local relaxation or transverse swing problem caused by packaging bag material flexibility.

Description

Technical Field

[0001] This utility model relates to the field of packaging bag cutting technology, specifically a packaging bag cutting device. Background Technology

[0002] In the packaging bag manufacturing and processing industry, slitting equipment is a key piece of equipment for cutting large-format roll films or composite bag materials into finished products of specific widths. Existing slitting machines generally use circular or flat blades as cutting components, and complete the cutting of packaging bag materials while they are moving by means of contact between the blades and the bottom rollers or direct pressure cutting.

[0003] However, such equipment has a significant technical flaw in actual operation: due to the inherent flexibility of the packaging bag material, if there is a lack of effective and balanced tension control on both sides when passing through the cutting edge area, the material is prone to localized loosening or lateral swaying. In this state, the initial pressure exerted on the loose material surface by the cutter when it falls or cuts in cannot be effectively converted into vertical shearing force; instead, it pushes the material, causing it to deviate momentarily. This not only causes the cutting path to deviate from the preset straight line, resulting in quality problems such as skewed and wavy cut edges, but also exacerbates the wear on one side of the cutter due to uneven force, reducing blade life and increasing the scrap rate, seriously affecting production efficiency and product quality.

[0004] Therefore, this utility model proposes a packaging bag cutting device. Utility Model Content

[0005] The purpose of this utility model is to provide a packaging bag cutting device to solve the problems mentioned in the background art. To achieve the above objective, this utility model provides the following technical solution: a packaging bag cutting device, including a workbench, a frame above the workbench, a cutter for cutting packaging bags at the bottom of the frame, a connecting strip above the cutter, a guide post above the connecting strip, a connecting plate at the end of the guide post, the connecting plate being vertically displaced by a cylinder, and pressing mechanisms on both sides of the frame to squeeze and straighten the area of ​​the packaging bag being cut.

[0006] Preferably, the pressing mechanism includes a bent rod located on the side of the connecting strip, a spring at the bottom end of the bent rod, a fixed cylinder on the outer wall of the bent rod, a U-shaped box at the bottom of the fixed cylinder, the bottom of the spring being fixedly connected to the U-shaped box, a squeezing strip inside the U-shaped box, a cavity structure being formed between the squeezing strip and the U-shaped box, and a pair of airbags at the bottom of the connecting plate, the airbags being connected to the U-shaped box through an air tube.

[0007] Preferably, the elastic force of spring one pulls the bottom of the extrusion strip below the bottom of the cutter under normal conditions.

[0008] Preferably, the bottom area of ​​the extrusion strip is elastic, and a second spring is provided between the extrusion strip and the U-shaped box, with the two ends of the second spring being fixedly connected to the extrusion strip and the U-shaped box respectively.

[0009] Preferably, a pair of detection heads are provided on the side of the frame, and the detection heads are located directly above the side of the packaging bag. The detection heads detect the straightness of the packaging bag transmission by acquiring images.

[0010] Preferably, the bent rod and the connecting strip are slidably connected in the lateral direction, the side of the bent rod is provided with a connecting piece, the side of the connecting piece is provided with an electric push rod, and the end of the electric push rod is fixedly connected to the connecting strip.

[0011] This utility model has at least the following beneficial effects: In this invention, a pressing mechanism is incorporated to compress and straighten the packaging bag in the cutting area before the cutter cuts it. This ensures the bag remains flat and under tension during cutting, effectively preventing localized loosening or lateral swaying caused by the flexibility of the packaging material. Consequently, the pressure exerted on the bag surface by the cutter during its descent or entry is better converted into vertical shearing force, guaranteeing the cutting path follows a pre-set straight line. This reduces quality issues such as skewing and wavy edges, improving cutting accuracy and product quality.

[0012] Meanwhile, the detection head installed on the side of the frame can capture images of the packaging bag being transported in real time and detect its straightness, further ensuring the stability of the packaging bag during the transport and cutting process, and providing strong support for high-quality slitting operations. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the frame and U-shaped box structure in this utility model; Figure 3 This utility model Figure 2 Enlarged view of the structure of region A in the middle; Figure 4 This is a cross-sectional view of the fixed cylinder and U-shaped box structure in this utility model; Figure 5 This utility model Figure 4 Enlarged view of the structure of region B in the middle.

[0014] In the diagram: 1-Workbench; 2-Frame; 3-Cutter; 4-Connecting strip; 5-Guide post; 6-Connecting plate; 7-Bending rod; 8-Spring 1; 9-Fixing cylinder; 10-U-shaped box; 11-Extrusion strip; 12-Airbag; 13-Spring 2; 14-Detection head; 15-Connecting piece; 16-Electric push rod. Detailed Implementation

[0015] 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.

[0016] Please see Figure 1-5 This utility model provides a technical solution: a packaging bag cutting device, including a workbench 1, which is composed of a conveyor belt and can be used for cutting and transporting packaging bags. A frame 2 is fixedly connected to the workbench 1. A cutter 3 for cutting the packaging bag is located at the bottom of the frame 2. A connecting strip 4 is fixedly connected to the cutter 3 above it, and a guide post 5 is fixedly connected to the guide strip 4 above it. The guide post 5 passes through the frame 2 and is slidably connected to it. A connecting plate 6 is fixedly connected to the end of the guide post 5. The connecting plate 6 is vertically displaced by a cylinder, thereby controlling the lifting and lowering of the cutter 3. The cylinder is fixedly connected to the frame 2 via a connecting frame. Pressing mechanisms are provided on both sides of the frame 2. These mechanisms squeeze and straighten the area of ​​the packaging bag being cut, ensuring the flatness of the packaging bag during the cutting process and avoiding cutting quality problems caused by material loosening or swaying.

[0017] The pressing mechanism includes a bent rod 7 located on the side of the connecting strip 4. The bent rod 7 is L-shaped, with a spring 8 fixedly connected to its bottom end. A fixed cylinder 9 is slidably connected to the outer wall of the bent rod 7, and a U-shaped box 10 is fixedly connected to its bottom. The bottom of the fixed cylinder 9 is fixedly connected to the U-shaped box 10, and the inside of the U-shaped box 10 is a pressing strip 11 slidably connected to it. Under normal conditions, the elastic force of the spring 8 pulls the bottom of the pressing strip 11 below the bottom of the cutter 3. This design ensures that the pressing strip 11 always applies pressure to the packaging bag before the cutter 3 descends.

[0018] A cavity structure is formed between the extrusion strip 11 and the U-shaped box 10. A pair of airbags 12 are fixedly connected to the bottom of the connecting plate 6. The bottom of the airbags 12 is fixedly connected to the frame 2. The airbags 12 and the U-shaped box 10 are interconnected via air pipes. The bottom area of ​​the extrusion strip 11 is elastic. A second spring 13 is provided between the extrusion strip 11 and the U-shaped box 10, with both ends of the second spring 13 fixedly connected to the extrusion strip 11 and the U-shaped box 10 respectively. During the downward pressing of the connecting plate 6, the gas inside the airbags 12 enters the space between the extrusion strip 11 and the U-shaped box 10 through the air pipes, thereby pushing the extrusion strip 11 outward a short distance, causing the area of ​​the packaging bag to be cut to taut.

[0019] In addition, a pair of detection heads 14 are fixedly connected to the side of the frame 2. The detection heads 14 are located directly above the side of the packaging bag and detect the straightness of the packaging bag's transmission by capturing images. The bending rod 7 and the connecting strip 4 are slidably connected laterally. The side of the bending rod 7 is provided with a connecting piece 15 and is fixedly connected to it. The side of the connecting piece 15 is provided with an electric push rod 16 and is fixedly connected to it. The end of the electric push rod 16 is fixedly connected to the connecting strip 4. When the detection head 14 detects a deviation in the transmission of the packaging bag, the electric push rod 16 will receive a signal transmitted from the control center, which will then drive the bending rod 7, the U-shaped box 10, and the extrusion strip 11 to make slight lateral displacements until the packaging bag maintains normal straight transmission.

[0020] Working principle: When it is necessary to cut the packaging bag, first place the packaging bag on the conveyor belt of workbench 1, start the equipment, and the conveyor belt will move the packaging bag to below the cutter 3. At this time, the cylinder starts to work, pushing the connecting plate 6 to move downward. The connecting plate 6 drives the guide post 5 and the connecting strip 4 to move downward in sync, thereby causing the cutter 3 to descend in preparation for cutting the packaging bag.

[0021] Meanwhile, due to the elastic force of spring 8, the bottom of the extrusion strip 11 is always lower than the bottom of the cutter 3. Before the cutter 3 descends, the extrusion strip 11 contacts the packaging bag and performs initial compression. As the connecting plate 6 continues to move downward, the airbag 12 is compressed, and the gas inside it enters the cavity structure between the extrusion strip 11 and the U-shaped box 10 through the air tube, pushing the extrusion strip 11 outward a short distance to further compress and straighten the area of ​​the packaging bag to be cut, ensuring the flatness of the packaging bag during the cutting process.

[0022] During the bag transfer process, the detection head 14 on the side of the frame 2 captures images of the side of the bag in real time to detect the straightness of its transfer. Once a deviation in the transfer of the bag is detected, the detection head 14 transmits a signal to the control center. The control center immediately controls the electric push rod 16 to work. The electric push rod 16 drives the bending rod 7, the U-shaped box 10 and the extrusion strip 11 to make slight lateral displacements, adjusting the position of the bag to maintain normal straight-line transfer until the entire bag cutting process is completed.

[0023] Compared to existing technologies, the packaging bag cutting equipment proposed in this invention has significant advantages. Through its unique pressing mechanism design, it initially compresses the packaging bag before the cutter 3 descends, and continuously provides uniform and stable tension control during the cutting process, effectively avoiding cutting quality problems caused by material loosening or swaying. Simultaneously, the coordinated use of the detection head 14 and the electric push rod 16 enables real-time monitoring and automatic adjustment of the straightness of the packaging bag's transport, further improving cutting accuracy and production efficiency.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A packaging bag cutting device, comprising a workbench (1), a frame (2) above the workbench (1), and a cutter (3) for cutting packaging bags at the bottom of the frame (2), characterized in that: A connecting strip (4) is provided above the cutter (3), a guide post (5) is provided above the connecting strip (4), a connecting plate (6) is provided at the end of the guide post (5), and the connecting plate (6) is moved vertically by a cylinder. A pressing mechanism is provided on both sides of the frame (2), and the pressing mechanism is used to squeeze and straighten the packaging bag area being cut. The pressing mechanism includes a bent rod (7) located on the side of the connecting bar (4), a spring (8) at the bottom of the bent rod (7), a fixed cylinder (9) on the outer wall of the bent rod (7), a U-shaped box (10) at the bottom of the fixed cylinder (9), the bottom of the spring (8) being fixedly connected to the U-shaped box (10), a squeezing strip (11) inside the U-shaped box (10), a cavity structure being formed between the squeezing strip (11) and the U-shaped box (10), and a pair of airbags (12) at the bottom of the connecting plate (6), the airbags (12) and the U-shaped box (10) being connected to each other through an air pipe.

2. The packaging bag cutting equipment according to claim 1, characterized in that: The elastic force of spring 1 (8) pulls the bottom of the extrusion bar (11) below the bottom of the cutter (3) under normal conditions.

3. The packaging bag cutting equipment according to claim 2, characterized in that: The bottom area of ​​the extrusion strip (11) is elastic, and a second spring (13) is provided between the extrusion strip (11) and the U-shaped box (10). The two ends of the second spring (13) are fixedly connected to the extrusion strip (11) and the U-shaped box (10) respectively.

4. The packaging bag cutting equipment according to claim 3, characterized in that: The frame (2) has a pair of detection heads (14) on its side. The detection heads (14) are located directly above the side of the packaging bag. The detection heads (14) detect the straightness of the packaging bag transmission by acquiring the image.

5. The packaging bag cutting equipment according to claim 4, characterized in that: The bent rod (7) and the connecting strip (4) are slidably connected in the lateral direction. The side of the bent rod (7) is provided with a connecting piece (15), and the side of the connecting piece (15) is provided with an electric push rod (16). The end of the electric push rod (16) is fixedly connected to the connecting strip (4).

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