A bag-making machine that facilitates the pulling of plastic film raw materials

Abstract

This disclosure relates to the technical field of packaging bag production. One embodiment of this disclosure provides a bag-making machine that facilitates the pulling of plastic film raw materials. The machine includes: an equipment frame and a portal frame, the portal frame being fixed on the equipment frame. A transmission groove is formed on the inner surface of the equipment frame. A feeding and pulling assembly is disposed within the transmission groove and the equipment frame. A cutting assembly is disposed within the portal frame. The feeding and pulling assembly includes a driven sleeve and a driving sleeve, which are rotatably connected to the two side surfaces of the equipment frame. The driving sleeve has several slots, and a plastic film shaft is inserted into and connected to both the driven and driving sleeves. Several locking strips are provided at one end of the plastic film shaft, and these strips are all inserted into the slots. This technical solution solves the problem in the prior art where traditional pulling mechanisms struggle to generate a stable clamping force, leading to film slippage and insufficient tension.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the technical field of packaging bag production, and more specifically, to a bag-making machine that facilitates the pulling of plastic film raw materials. Background Technology

[0002] In the plastic bag manufacturing industry, the stretching effect of plastic film raw materials directly affects the dimensional accuracy and appearance quality of the finished bags. Traditional bag making machines mostly use single-roller clamping or friction transmission methods for their stretching mechanisms, which have obvious technical limitations.

[0003] For plastic films with uneven thickness or smooth surfaces (such as PE film and POF film), traditional stretching mechanisms struggle to generate stable clamping force, leading to film slippage and insufficient tension. This problem is particularly pronounced during high-speed production. Wrinkles and loosening of the film during transport directly cause dimensional deviations in subsequent cutting processes, resulting in defects such as skewed bag openings and inconsistent lengths, significantly increasing the scrap rate.

[0004] Furthermore, the tension adjustment of traditional stretching mechanisms is mostly manual and crude, making it difficult to adapt to the different characteristics of plastic films of various materials. When the film material expands and contracts due to temperature changes, it cannot compensate for tension changes in real time, further exacerbating the problem of insufficient film tension. At the same time, the coordination between the stretching and cutting processes of some equipment is poor, and the matching accuracy between stretching speed and cutting frequency is low, which can easily cause the film material to relax instantly, resulting in defects such as burrs and tears on the cutting edge. These drawbacks make it difficult for traditional bag making machines to meet the production requirements of high-precision bag making, and there is an urgent need for a new type of equipment that can achieve stable stretching and full tension to overcome the technical bottlenecks. Utility Model Content

[0005] To overcome the above-mentioned defects, the embodiments of this disclosure provide a bag making machine that facilitates the pulling of plastic film raw materials, solving the technical problem that traditional pulling mechanisms in the prior art are unable to form a stable clamping force, and the film material is prone to slippage, resulting in insufficient tightening.

[0006] According to one aspect, at least one embodiment of this disclosure provides a bag-making machine that facilitates the pulling of plastic film raw materials, comprising: Equipment rack and gantry frame, wherein the gantry frame is fixed to the equipment rack; The transmission groove is formed on the inner surface of the equipment frame, and the feeding and pulling assembly is disposed in the transmission groove and the equipment frame. A cutting assembly disposed within the gantry frame; The feeding and pulling assembly includes a driven sleeve and an active sleeve. The driven sleeve and the active sleeve are rotatably connected to the inner surfaces of the two sides of the equipment frame, respectively. The active sleeve has several slots. A plastic film shaft is inserted and connected to the driven sleeve and the active sleeve. A number of clips are provided at one end of the plastic film shaft, and the clips are all inserted into the slots.

[0007] As a further technical solution, a limiting wheel is provided at one end of the plastic film shaft, a first cylinder is provided on one side of the equipment frame, a locking block is provided at the output end of the first cylinder, the locking block is movably embedded in the limiting wheel, an external gear is provided on the active sleeve, and a drive gear that is driven to rotate by electricity is provided on the outside of the equipment frame, the drive gear meshing with the external gear.

[0008] As a further technical solution, a screw driven by electricity is installed in the transmission groove, and a pair of moving blocks are slidably connected in the transmission groove. The moving blocks are respectively connected to both ends of the screw by threaded connection. Each moving block is provided with a limit frame on its top, and the upper end of the limit frame is fitted outside the plastic film shaft.

[0009] As a further technical solution, several tensioning shafts are rotatably connected inside the equipment frame, and a pair of synchronous shaft rollers are rotatably connected to both ends of the equipment frame. The two pairs of synchronous shaft rollers are located on the front and rear sides of the portal frame, respectively.

[0010] As a further technical solution, each of the pair of synchronous shaft rollers is provided with a synchronous gear at one end, the synchronous gears mesh with each other, one of the two pairs of synchronous shaft rollers is provided with a pulley, the pulleys are connected by belt drive, and one of the synchronous shaft rollers is driven to rotate by electricity.

[0011] As a further technical solution, the cutting assembly includes a second cylinder, which is vertically fixed to the top of the gantry frame. The output end of the second cylinder is connected to a crossbeam, and a cutting blade is provided at the bottom of the crossbeam.

[0012] As a further technical solution, a pressing frame is movably connected inside the cross frame, and springs are fitted at the connection between the pressing frame and the cross frame.

[0013] As a further technical solution, both the tensioning shaft and the synchronous shaft roller have anti-slip structural surfaces.

[0014] The beneficial effects of the embodiments disclosed herein are as follows: In this disclosure, the feeding and pulling assembly solves the problems of film slippage and insufficient tension through multiple transmission and limiting designs. The active sleeve and the shaft's slotted strips cooperate to achieve rigid transmission, while the synchronous shaft roller ensures consistent pulling rhythm through gear and belt linkage, and the tensioning shaft maintains stable tension. The limiting frame adapts to different shafts, and the anti-slip surface enhances friction, preventing film wrinkling or loosening during high-speed production. This design allows for full and stable pulling of the plastic film, improving the dimensional accuracy of subsequent bag making, reducing scrap rates, and adapting to the production needs of various film materials. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of a structure in one embodiment of the present disclosure; Figure 2 This is an isometric drawing of the present disclosure; Figure 3 This is an isometric sectional view of the present disclosure; Figure 4 Appendix to this disclosure Figure 1 Enlarged view of part A in the middle; Figure 5 Appendix to this disclosure Figure 2 Enlarged view of part B in the middle section; In the diagram: 1. Equipment frame; 2. Gantry frame; 3. Transmission groove; 4. Feeding and pulling assembly; 4-1. Driven sleeve; 4-2. Driving sleeve; 4-3. Slot; 4-4. Plastic film shaft; 4-5. Locking strip; 4-6. Limiting wheel; 4-7. First cylinder; 4-8. Locking block; 4-9. External gear; 4-10. Drive gear; 4-11. Screw; 4-12. Moving block; 4-13. Limiting frame; 4-14. Tensioning shaft; 4-15. Synchronous shaft roller; 4-16. Synchronous gear; 4-17. Pulley; 5. Cutting assembly; 5-1. Second cylinder; 5-2. Cross frame; 5-3. Cutting blade; 5-4. Pressing frame; 5-5. Spring. Detailed Implementation

[0017] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0018] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0019] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0020] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to 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.

[0022] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] like Figures 1-5 As shown, it illustrates a bag-making machine that facilitates the pulling of plastic film raw materials according to an embodiment of the present disclosure, comprising: Equipment frame 1 and portal frame 2, wherein the portal frame 2 is fixed on the equipment frame 1; The transmission groove 3 and the feeding and pulling assembly 4 are provided. The transmission groove 3 is formed on the inner surface of the equipment frame 1, and the feeding and pulling assembly 4 is disposed in the transmission groove 3 and the equipment frame 1. Cutting assembly 5, which is disposed within the gantry frame 2; The feeding and pulling assembly 4 includes a driven sleeve 4-1 and a driving sleeve 4-2. The driven sleeve 4-1 and the driving sleeve 4-2 are rotatably connected to the inner surfaces of the two sides of the equipment frame 1, respectively. The driving sleeve 4-2 has several slots 4-3. A plastic film shaft 4-4 is inserted and connected to the driven sleeve 4-1 and the driving sleeve 4-2. One end of the plastic film shaft 4-4 is provided with several retaining strips 4-5, all of which are inserted into the... Within the slot 4-3, a limiting wheel 4-6 is provided at one end of the plastic film shaft 4-4. A first cylinder 4-7 is provided on one side of the equipment frame 1, and a locking block 4-8 ​​is provided at the output end of the first cylinder 4-7. The locking block 4-8 ​​is movably fitted into the limiting wheel 4-6. An external gear 4-9 is provided on the drive sleeve. A drive gear 4-10, which is electrically driven to rotate, is provided outside the equipment frame 1. The drive gear 4-10 meshes with the external gear 4-9. A screw 4-11 driven by electricity is installed in the transmission groove 3. A pair of moving blocks 4-12 are slidably connected in the transmission groove 3. The moving blocks 4-12 are respectively connected to both ends of the screw 4-11 by threaded engagement. Each moving block 4-12 is provided with a limit frame 4-13 on its top. The upper end of the limit frame 4-13 is fitted outside the plastic film shaft 4-4. Several tensioning shafts 4-14 are rotatably connected in the equipment frame 1. A pair of synchronous shaft rollers 4-15 are rotatably connected to both ends of the equipment frame 1. The two pairs of synchronous shaft rollers 4-15 are respectively located on the front and rear sides of the portal frame 2. One end of each pair of synchronous shaft rollers 4-15 is provided with a synchronous gear 4-16, which meshes with each other. One of the two pairs of synchronous shaft rollers 4-15 is provided with a pulley 4-17, which are connected by belt drive. One of the synchronous shaft rollers 4-15 is driven by electricity to rotate.

[0024] In some examples, a feeding and pulling assembly 4 is designed to achieve stable feeding of plastic film raw materials. This assembly includes a driven sleeve 4-1 and an active sleeve 4-2 on both sides of the equipment frame 1, which are rotatably connected by bearings. The two ends of the plastic film shaft 4-4 are inserted into it. The slot 4-3 in the active sleeve 4-2 is adapted to the locking strip 4-5 at one end of the shaft to ensure that the active sleeve 4-2 drives the shaft to rotate synchronously when it rotates. The limiting wheel 4-6 is fixed to the end of the shaft. The output end of the first cylinder 4-7 on one side of the equipment frame 1 is connected to the locking block 4-8. The locking block 4-8 ​​can be embedded in the groove of the limiting wheel 4-6 to realize the start and stop control of the shaft.

[0025] The external gear 4-9 on the active sleeve 4-2 meshes with the drive gear 4-10 driven by the external motor of the equipment frame 1, providing power for the rotation of the shaft. The screw 4-11 in the transmission groove 3 is rotatably connected by bearings, with the threads at both ends rotating in opposite directions. It is threadedly engaged with the sliding block 4-12. The limiting bracket 4-13 on the top of the moving block 4-12 is arc-shaped and fitted outside the shaft. Its spacing can be adjusted as the moving block 4-12 moves to accommodate plastic film materials of different widths. The tensioning shaft 4-14 in the equipment frame 1 is rotatably connected by bearings and distributed along the direction of plastic film travel to create tension on the film material. The synchronous shaft rollers 4-15 at both ends are distributed in pairs and rotatably connected by bearings. The synchronous gear 4-16 at one end meshes to ensure synchronous rotation in opposite directions. The pulleys 4-17 of the two pairs of synchronous shaft rollers 4-15 are driven by the same motor through belt drive to ensure consistent traction rhythm between the front and rear sections.

[0026] During operation, the motor drives the drive gear 4-10 to rotate the external gear 4-9. The active sleeve 4-2, through the clamping strip 4-5 and the clamping groove 4-3, drives the shaft to rotate and release the material. The extension and retraction of the first cylinder 4-7 controls the insertion or disengagement of the clamping block 4-8 ​​into or out of the limiting wheel 4-6, realizing the start and stop of material release. The rotation of the screw 4-11 causes the moving block 4-12 to move the limiting frame 4-13, clamping the shaft to prevent shaking. After the plastic film is tensioned by the tensioning shaft 4-14, it enters the synchronous shaft roller 4-15. The synchronous gear 4-16 and the pulley 4-17 cooperate to make the shaft roller synchronously clamp and pull the film material. After processing by the gantry frame 2, it continues to be conveyed backward. The tensioning shaft 4-14 maintains the tension of the film material to avoid wrinkles, the synchronous transmission of the synchronous shaft roller 4-15 ensures smooth pulling, and the limiting frame 4-13 is adapted to different shaft lengths. This component achieves stable pulling of plastic film raw materials through the coordinated action of multiple sets of transmission and limiting structures, improving feeding accuracy and continuity.

[0027] like Figures 1-5 As shown, in this embodiment, the cutting assembly 5 includes a second cylinder 5-1, which is vertically fixed to the top of the gantry frame 2. The output end of the second cylinder 5-1 is connected to a crossbeam 5-2. A cutting blade 5-3 is provided at the bottom of the crossbeam 5-2. A pressing frame 5-4 is movably connected inside the crossbeam 5-2. Springs 5-5 are fitted at the connection between the pressing frame 5-4 and the crossbeam 5-2.

[0028] In some examples, to achieve a stable cutting and bag-making effect of the plastic film, a cutting assembly 5 is designed. This assembly includes a second cylinder 5-1 vertically fixed at the top of the gantry frame 2, with its output end bolted to the top of the cross frame 5-2. The cutting blade 5-3 at the bottom of the cross frame 5-2 is fixed by bolts, with the blade corresponding to the table surface of the lower equipment frame 1. The pressing frame 5-4 is slidably mounted on the guide rod of the cross frame 5-2, and the spring 5-5 is mounted on the guide rod, with its two ends abutting against the cross frame 5-2 and the pressing frame 5-4 respectively. In its natural state, the lower end of the pressing frame 5-4 protrudes beyond the blade.

[0029] During operation, the plastic film is pulled to the cutting position within the gantry frame 2 by the synchronous roller 4-15. The second cylinder 5-1 extends, pushing the crossbeam 5-2 downwards. The pressing frame 5-4 first contacts the surface of the plastic film, and the spring 5-5, compressed, generates elastic force, pressing the film firmly onto the table. The crossbeam 5-2 continues to descend, and the cutting blade 5-3 contacts the film and completes the cut. After cutting, the second cylinder 5-1 retracts, causing the crossbeam 5-2 to rise, and the spring 5-5 returns to its original position, allowing the pressing frame 5-4 to detach from the film. The elastic cushioning of the spring 5-5 prevents the pressing frame 5-4 from excessively squeezing the film. The step-by-step pressing and cutting actions ensure that the film does not shift or wrinkle during cutting, and the precise alignment of the blade with the table ensures a clean cut. This component, through its linked design of pressing before cutting, achieves stable cutting of the plastic film, improving the cutting quality and processing efficiency of bag making.

[0030] For example, such as Figure 1 As shown, the surfaces of the tensioning shaft 4-14 and the synchronous shaft roller 4-15 are both anti-slip structural surfaces.

[0031] In some examples, the anti-slip surface of the tensioning shaft 4-14 and the synchronous roller 4-15 increases the friction with the plastic film. The anti-slip surface of the tensioning shaft 4-14 prevents the film from slipping during tensioning, ensuring stable tension and avoiding wrinkles or stretching deformation of the film caused by slippage. The anti-slip surface of the synchronous roller 4-15 enhances the gripping force on the film during clamping and pulling, ensuring uniform pulling speed, preventing the film from shifting during conveying, ensuring accurate subsequent cutting, and improving bag-making quality.

[0032] In practical use: The two ends of the plastic film shaft 4-4 are inserted into the driven sleeve 4-1 and the driving sleeve 4-2 respectively. The clamping strip 4-5 is embedded in the slot 4-3 to achieve synchronous transmission. Rotating the screw 4-11 causes the moving block 4-12 to drive the limiting frame 4-13 to clamp the shaft. The drive gear 4-10 drives the external gear 4-9 to rotate, and the driving sleeve 4-2 drives the shaft to release the material. After being tensioned by the tensioning shaft 4-14, the plastic film enters the synchronous shaft roller 4-15. The synchronous gear 4-16 and the pulley 4-17 ensure synchronous clamping and pulling of the shaft roller. When the film material is conveyed to the gantry frame 2, the second cylinder 5-1 pushes the crossbeam 5-2 down. The pressing frame 5-4 first presses the film material, and then the cutting blade 5-3 completes the cutting. The spring 5-5 buffers and prevents the film material from shifting. The first cylinder 4-7 controls the limiting wheel 4-6 through the clamping block 4-8 ​​to start and stop. The anti-slip structure throughout the process prevents the film material from slipping and ensures stable pulling.

[0033] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A bag making machine facilitating the pulling of a plastic film stock material, characterized by, include: Equipment rack (1) and gantry frame (2), wherein the gantry frame (2) is fixed on the equipment rack (1); The transmission groove (3) and the feeding traction assembly (4) are provided. The transmission groove (3) is formed on the inner surface of the equipment frame (1), and the feeding traction assembly (4) is provided in the transmission groove (3) and the equipment frame (1). A cutting assembly (5) is disposed within the gantry frame (2); The feeding and pulling assembly (4) includes a driven sleeve (4-1) and an active sleeve (4-2). The driven sleeve (4-1) and the active sleeve (4-2) are rotatably connected to the inner surfaces of the two sides of the equipment frame (1). The active sleeve (4-2) has several slots (4-3). Plastic film shafts (4-4) are inserted and connected to the driven sleeve (4-1) and the active sleeve (4-2). Several clips (4-5) are provided at one end of the plastic film shaft (4-4). All clips (4-5) are inserted into the slots (4-3).

2. The bag making machine of claim 1, wherein, One end of the plastic film shaft (4-4) is provided with a limiting wheel (4-6), and a first cylinder (4-7) is provided on one side of the equipment frame (1). A locking block (4-8) is provided at the output end of the first cylinder (4-7). The locking block (4-8) is movably embedded in the limiting wheel (4-6). An external gear (4-9) is provided on the drive sleeve. A drive gear (4-10) that is driven by electricity is provided on the outside of the equipment frame (1). The drive gear (4-10) meshes with the external gear (4-9).

3. The bag making machine of claim 2, wherein, The transmission groove (3) is equipped with a screw (4-11) that is driven to rotate by electricity. A pair of moving blocks (4-12) are slidably connected in the transmission groove (3). The moving blocks (4-12) are respectively connected to both ends of the screw (4-11) by threaded connection. Each moving block (4-12) is provided with a limit frame (4-13) on its top. The upper end of the limit frame (4-13) is fitted outside the plastic film shaft (4-4).

4. The bag making machine of claim 3, wherein, Several tensioning shafts (4-14) are rotatably connected inside the equipment frame (1). A pair of synchronous shaft rollers (4-15) are rotatably connected to both ends of the equipment frame (1). The two pairs of synchronous shaft rollers (4-15) are located on the front and rear sides of the portal frame (2).

5. The bag making machine of claim 4, wherein, Each pair of synchronous rollers (4-15) is provided with a synchronous gear (4-16) at one end, and the synchronous gears (4-16) mesh with each other. One of the two pairs of synchronous rollers (4-15) is provided with a pulley (4-17), and the pulleys (4-17) are connected by belt drive. One of the synchronous rollers (4-15) is driven to rotate by electricity.

6. The bag making machine of claim 1, wherein, The cutting assembly (5) includes a second cylinder (5-1), which is vertically fixed to the top of the gantry frame (2). The output end of the second cylinder (5-1) is connected to a crossbeam (5-2), and a cutting blade (5-3) is provided at the bottom of the crossbeam (5-2).

7. A bag making machine for facilitating the pulling of plastic film stock material according to claim 6, wherein, A pressing frame (5-4) is movably connected inside the cross frame (5-2), and a spring (5-5) is fitted at the connection between the pressing frame (5-4) and the cross frame (5-2).

8. The bag making machine of claim 4, wherein, Both the tensioning shaft (4-14) and the synchronous shaft roller (4-15) have anti-slip surfaces.

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