A versatile bag cutting and folding device

Abstract

This utility model relates to the technical field of bag processing equipment, and discloses a highly adaptable bag cutting and folding device, including a heat sealing mechanism, a cutting mechanism, and a pressing mechanism sequentially arranged on a frame. The heat sealing mechanism includes an upper heat sealing plate, a lower heat sealing plate, and a first driving mechanism. The pressing mechanism includes an upper pressure plate, a lower support assembly, and a second driving mechanism. The lower support assembly includes a lower support plate, a support rod, and a spring. The lower support plate has a mounting groove, and the support rod is slidably connected to the mounting groove. The support rod has an abutment head and a limiting block. The spring is sleeved on the support rod, with its upper end abutting against the abutment head and its lower end abutting against the bottom wall of the mounting groove. The lower heat sealing plate has a limiting protrusion protruding towards the abutment head, with its lower surface abutting against the upper surface of the abutment head. The cutting mechanism cuts the heat-sealed bag. This utility model can adapt to bags of different thicknesses and bags with special structures such as gusseted edges, making it more versatile.

Description

Technical Field

[0001] This utility model relates to the technical field of bag processing equipment, specifically a highly applicable bag cutting and folding device. Background Technology

[0002] With the rapid development of the packaging industry, the application scenarios of bags are becoming increasingly widespread, and their structures and specifications are also showing a trend of diversification. In addition to regular flat bags, the demand for bags with special designs such as different thickness gradients and side gussets is gradually increasing. These types of bags place higher demands on the adaptability of the clamping mechanism during the cutting and folding process. It is necessary to ensure the stability of clamping to avoid cutting deviation, and also to adapt to the differences in the local structure of the bag to prevent damage to the bag or affect the folding effect.

[0003] Patent publication number CN118238469A discloses a bag cutting and folding device. This device, through a sequentially arranged pressing mechanism, cutting mechanism, folding and pressing mechanism, and limiting structure, solves the problems of poor cutting reliability and mutual interference between the cut bag and the cutting mechanism in traditional equipment. Specifically, the first lower support seat of the folding and pressing mechanism cooperates with the first upper pressure plate, playing a crucial role in pressing the bag body before cutting and storing the bag end after cutting. Patent publication number CN118083656A discloses a long bag conveying device, which discloses a method for smoothly conveying bags.

[0004] However, the first lower support in the aforementioned patent CN118238469A still adopts an integrated rigid structure design, with its top surface being a fixed plane that cannot be adaptively adjusted according to the characteristics of the bag. (See attached...) Figure 14 As shown, in actual production scenarios, the thickness of bags often varies, and the local thickness of some functional bags, such as packaging bags with side gussets or folded edges, can increase significantly due to the stacking of the gussets. When dealing with bags of different thicknesses or with gussets, the first lower support of the rigid overall structure cannot form a suitable clamping: for thinner bags, insufficient clamping force causes the bag to easily shift during cutting and folding, affecting the neatness of the folding; for thicker bags or bags with gussets, the rigid contact surface cannot fit the local protruding structure of the bag, resulting in an unstable clamping, and may even damage the bag's gussets or sealing structure due to excessive local pressure, severely limiting the applicability of the device and making it difficult to meet diverse production needs.

[0005] In view of this, the applicant conducted in-depth research on the above-mentioned issues, which led to this case. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides a highly adaptable bag cutting and folding device. It reliably cuts bags and neatly folds the cut bags, ensuring that the cut bags and the cutting mechanism do not interfere with each other. Furthermore, it is adaptable to bags of different thicknesses and with special structures such as those with inserts, making it more versatile.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A versatile bag cutting and folding device includes a heat sealing mechanism, a cutting mechanism, and a pressing mechanism sequentially arranged on a frame. The heat sealing mechanism includes an upper heat sealing plate, a lower heat sealing plate, and a first driving mechanism for lifting and lowering the upper heat sealing plate. The pressing mechanism includes an upper pressure plate, a lower support assembly, and a second driving mechanism for lifting and lowering the upper pressure plate. The lower support assembly includes a lower support plate, a support rod, and a spring. The lower support plate has several mounting slots. The support rod is slidably connected to the mounting slots. The upper end of the support rod has a push-off head, and the lower end of the support rod is fitted with a limiting block. The spring is fitted on the support rod, with the upper end of the spring abutting against the push-off head and the lower end of the spring abutting against the bottom wall of the mounting slot. The lower heat sealing plate has a limiting protrusion protruding towards the push-off head, with the lower surface of the limiting protrusion abutting against the upper surface of the push-off head. The cutting mechanism cuts the heat-sealed bags.

[0009] Furthermore, the lower support assembly also includes a first cylinder body, which is connected to the frame, and the piston rod of the first cylinder body is connected to the lower support plate.

[0010] Furthermore, insulating wood is provided on the lower surface of the upper hot-pressing plate and the upper surface of the lower hot-pressing plate, and heating wires are provided on the side of the insulating wood that is close to each other. The two heating wires are arranged correspondingly above and below each other, and Teflon cloth is covered on the outside of the insulating wood.

[0011] Furthermore, the first driving mechanism includes a first motor, a drive shaft, a first cam, a first connecting rod, a sliding seat, and a transition block. The drive shaft is rotatably connected to the frame. The first motor is connected to the frame and drives the drive shaft to rotate. The first cam is sleeved on both ends of the drive shaft. The sliding seat is fixedly connected to both sides of the upper hot-pressing plate. The upper end of the first connecting rod is slidably connected to the sliding seat. The lower end of the first connecting rod is connected to the transition block. The transition block is provided with a first roller that is rotatably connected. The first roller is rotatably connected to the side wall of the first cam. The sliding seat is provided with a second cylinder. The piston rod of the second cylinder is fixedly connected to the upper end of the first connecting rod.

[0012] Furthermore, the second drive mechanism includes a swing arm, a second cam, a second connecting rod, and a third connecting rod. The second cam is sleeved on both ends of the drive shaft, the second connecting rod is connected to both sides of the upper pressure plate, the lower end of the second connecting rod is hinged to the upper end of the third connecting rod, the rear end of the swing arm is rotatably connected to the frame through a rotating shaft, the front end of the swing arm is hinged to the lower end of the third connecting rod, and a second roller is rotatably connected on the swing arm, the second roller being tumbledly connected to the second cam.

[0013] Furthermore, the outer peripheral contour of the second cam includes a high-point holding trajectory segment, a first descending trajectory segment, a cutting holding trajectory segment, a second descending trajectory segment, and an ascending trajectory segment connected in sequence.

[0014] Furthermore, the frame is provided with a guide base, and the first connecting rod and the second connecting rod are slidably connected to the guide base.

[0015] Furthermore, the cutting mechanism includes a mounting base, a drive wheel, a driven wheel, a transmission belt, a second motor, and a cutting blade assembly. The mounting base is fixedly connected to the guide base. The drive wheel is rotatably connected to the mounting base on one side, and the driven wheel is rotatably connected to the mounting base on the other side. The transmission belt is sleeved on the drive wheel and the driven wheel. The second motor is fixedly connected to the frame and drives the drive wheel to rotate. The cutting blade assembly includes a cutting blade holder and a blade. The cutting blade holder is fixedly connected to the transmission belt, and the blade is fixedly connected to the cutting blade holder.

[0016] Furthermore, the limiting protrusion is provided with a clearance groove to allow the blade to move.

[0017] This utility model provides a solution with the following advantages:

[0018] 1. The mounting groove of the support rod and the lower support plate slides together, and the spring always applies an upward elastic force to the abutment head. When clamping bags of different thicknesses or with gusseted edges, the abutment head can adaptively rise and fall according to the local thickness changes of the bag body, forming a point-to-point fit support, avoiding uneven clamping or damage to the bag body caused by rigid contact. Furthermore, this invention can be adapted to special bags with gusseted edges or folded edges, expanding its application range by more than three times compared to existing technologies. It eliminates the need to replace support components for different bag sizes, significantly improving production flexibility and applicability.

[0019] 2. This utility model directly heat-seals and shapes the bag body using heating wires installed on the upper and lower heat-sealing plates, eliminating the need for additional heat-sealing equipment and reducing process steps. Furthermore, the heat-sealing mechanism, by incorporating insulating wood and Teflon cloth, prevents the heating wires from directly adhering to the bag body and also prevents heat transfer to other components, effectively improving the heat-sealing quality.

[0020] 3. In this utility model, the first drive mechanism and the second drive mechanism share a drive shaft. The first cam and the second cam are sleeved on the drive shaft. Only one first motor is needed to drive the two core mechanisms, which effectively reduces the equipment cost.

[0021] 4. In this utility model, the upper heat-sealing plate can be lifted by the second cylinder, which greatly increases the distance between the upper and lower heat-sealing plates and increases the operating space, making it easier for users to replace the Teflon cloth. Attached Figure Description

[0022] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0023] Figure 2 This is a three-dimensional view of the external structure of the utility model;

[0024] Figure 3 This is a perspective view of the external structure of this utility model;

[0025] Figure 4 for Figure 1 A magnified view of a portion of region A in the middle;

[0026] Figure 5 This is a side view of the external structure of this utility model;

[0027] Figure 6 This is a schematic diagram of the cutting mechanism;

[0028] Figure 7 A schematic diagram of the structure for lifting the upper heat-sealing plate in the second cylinder;

[0029] Figure 8 This is an initial state diagram of the present invention;

[0030] Figure 9 This is a diagram showing the state of the present invention during the hot-pressing process;

[0031] Figure 10 This is a diagram showing the state of the present invention during cutting;

[0032] Figure 11 This is a diagram showing the state of the stacked bags during the secondary downward pressing of the upper pressure plate of this utility model;

[0033] Figure 12 This is a diagram showing the completed stacking of bags according to this utility model;

[0034] Figure 13 This is a diagram showing the state of the bags after multiple stackings according to this utility model;

[0035] Figure 14 This is a schematic diagram of a thin film with side inserts.

[0036] The components include: frame 1, guide base 11, hot-pressing mechanism 2, upper hot-pressing plate 21, lower hot-pressing plate 22, insulating wood 23, heating wire 24, Teflon cloth 25, cutting mechanism 3, mounting base 31, driving wheel 32, driven wheel 33, transmission belt 34, second motor 35, cutter holder 36, blade 37, pressing mechanism 4, upper pressure plate 41, lower support assembly 42, lower support plate 421, support rod 422, spring 423, mounting groove 424, push head 425, and limit block 4. 26. First cylinder 427. Limiting protrusion 5. Relief groove 51. First motor 61. Drive shaft 62. First cam 63. First connecting rod 64. Sliding seat 65. Adapter block 66. First roller 67. Second cylinder 68. Swing arm 71. Second cam 72. High point holding trajectory segment 721. First descending trajectory segment 722. Cutting holding trajectory segment 723. Second descending trajectory segment 724. Ascending trajectory 725. Second connecting rod 73. Third connecting rod 74. Second roller 75. Detailed Implementation

[0037] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] Please see the appendix Figure 1 - Appendix Figure 13This utility model provides a highly applicable bag cutting and folding device, including a heat sealing mechanism 2, a cutting mechanism 3, and a pressing mechanism 4 sequentially arranged on a frame 1. The heat sealing mechanism 2 includes an upper heat sealing plate 21, a lower heat sealing plate 22, and a first driving mechanism for driving the upper heat sealing plate 21 to rise and fall. The lower heat sealing plate 22 is fixedly connected to the frame. The pressing mechanism 4 includes an upper pressure plate 41, a lower support assembly 42, and a second driving mechanism for driving the upper pressure plate 41 to rise and fall. The lower support assembly 42 includes a lower support plate 421, a support rod 422, and a spring 423. The lower support plate 421 is provided with a longitudinal direction. Several mounting slots 424 are provided. A support rod 422 passes through the lower support plate 421 and is slidably connected to the mounting slot 424. The upper end of the support rod 422 is provided with an abutment head 425, and the lower end of the support rod 422 is fitted with a limiting block 426. A spring 423 is fitted on the support rod 422. The upper end of the spring 423 abuts against the abutment head 425, and the lower end of the spring 423 abuts against the bottom wall of the mounting slot 424. The lower heat-sealing plate 22 is provided with a limiting protrusion 5 protruding towards the abutment head 425. The lower surface of the limiting protrusion 5 abuts against the upper surface of the abutment head 425. The cutting mechanism 3 cuts the heat-sealed bag. With the above structure, this device conveys the film towards the heat-sealing mechanism 2 through a feeding mechanism, which is the prior art described in the background art and will not be described in detail here. As the film is conveyed forward, the pressing mechanism 4 presses the film, the heat sealing mechanism 2 heats and seals the film, then the cutting mechanism 3 cuts the bag, and finally the pressing mechanism 4 presses the bag downwards to below the limiting protrusion 5. After that, the pressing mechanism 4 resets, and the lower surface of the bag is fixed to the bottom of the limiting protrusion 5 by the abutment head 425 under the elastic force of the spring 423. By repeating the above steps, this device can automatically heat seal, cut, and fold multiple bags.

[0039] In addition, the lower support assembly 42 also includes a first cylinder 427, and several first cylinders 427 are connected to the frame 1. The piston rod of the first cylinder 427 is connected to the lower support plate 421. The first cylinders 427 can drive the lower support plate 421 to move up and down. In this way, the overall height of the lower support assembly 42 can be adjusted in real time according to the cumulative thickness of the stacked bags.

[0040] In this embodiment, insulating wood 23 is provided on the lower surface of the upper hot-pressing plate 21 and the upper surface of the lower hot-pressing plate 22. Heating wires 24 are provided on the adjacent surfaces of the insulating wood 23, with two heating wires 24 arranged vertically. Teflon cloth 25 is sleeved on the outer side of the insulating wood 23. Voltage is applied to both ends of the heating wires 24 to bring them to a suitable temperature. Depending on the material thickness, the temperature of the heating wires 24 is generally between 150-280℃, thus enabling the hot-pressing of the plastic film. Since the heating wires 24 need to be energized, they must be insulated from the upper hot-pressing plate 21 and the lower hot-pressing plate 22 support using the insulating wood 23. The heating wires 24 are also insulated from each other using Teflon cloth 25, which provides insulation, anti-sticking properties, and heat conduction.

[0041] In this embodiment, the first driving mechanism includes a first motor 61, a drive shaft 62, a first cam 63, a first connecting rod 64, a sliding seat 65, and a transition block 66. The drive shaft 62 is rotatably connected to the frame 1. The first motor 61 is connected to the frame 1 and drives the drive shaft 62 to rotate through a sprocket transmission mechanism. The first cam 63 is sleeved on both ends of the drive shaft 62. The sliding seat 65 is fixedly connected to both sides of the upper hot-pressing plate 21. The upper end of the first connecting rod 64 is slidably connected to the sliding seat 65, and the lower end of the first connecting rod 64 is connected to the transition block 66. The transition block 66 is provided with a first roller 67 rotatably connected to the side wall of the first cam 63. The sliding seat 65 is provided with a second cylinder 68, and the piston rod of the second cylinder 68 is fixedly connected to the upper end of the first connecting rod 64. With the above structure, when the first cam 63 rotates, it can push the first roller 67 to move up and down, thereby driving the adapter block 66 and the first connecting rod 64 to move up and down, thus driving the upper hot-pressing plate 21 to move up and down. In addition, when it is necessary to replace the Teflon cloth 25, the second cylinder 68 can further drive the upper hot-pressing plate 21 to rise, which greatly increases the distance between the upper hot-pressing plate 21 and the lower hot-pressing plate 22, increasing the operating space and making it easier for the user to replace the Teflon cloth 25.

[0042] In this embodiment, the second drive mechanism includes a swing arm 71, a second cam 72, a second connecting rod 73, and a third connecting rod 74. The second cam 72 is sleeved on both ends of the drive shaft 62. The second connecting rod 73 is connected to both sides of the upper pressure plate 41. The lower end of the second connecting rod 73 is hinged to the upper end of the third connecting rod 74. The rear end of the swing arm 71 is rotatably connected to the frame 1 through a rotating shaft. The front end of the swing arm 71 is hinged to the lower end of the third connecting rod 74. A second roller 75 is rotatably connected on the swing arm 71, and the second roller 75 is tactilely connected to the second cam 72. Specifically, the outer peripheral contour of the second cam 72 includes a high-point holding trajectory segment 721, a first descending trajectory segment 722, a cutting holding trajectory segment 723, a second descending trajectory segment 724, and an ascending trajectory segment 725 connected in sequence. With the above structure, when the drive shaft 62 rotates, it drives the second cam 72 to rotate. When the second roller 75 is in contact with the high point holding trajectory segment 721, the upper pressure plate 41 is in the rising stop state. When the second roller 75 is in contact with the first descending trajectory segment 722, the upper pressure plate 41 begins to descend. When the second roller 75 is in contact with the cutting holding trajectory, the upper pressure plate 41 holds the film tightly against the abutment head 425. When the second roller 75 is in contact with the second descending trajectory, the upper pressure plate 41 continues to move downward, pressing the heat-sealed bag below the limiting protrusion 5. When the second roller 75 is in contact with the rising trajectory 725, the upper pressure plate 41 moves upward to reset.

[0043] In this embodiment, a guide base 11 is provided on the frame 1, and the first connecting rod 64 and the second connecting rod 73 are slidably connected to the guide base 11. The guide base 11 can guide the sliding of the first connecting rod 64 and the second connecting rod 73.

[0044] In this embodiment, the cutting mechanism 3 includes a mounting base 31, a drive wheel 32, a driven wheel 33, a transmission belt 34, a second motor 35, and a cutting blade assembly. The mounting base 31 is fixedly connected to the guide base 11. The drive wheel 32 is rotatably connected to the mounting base 31 on one side, and the driven wheel 33 is rotatably connected to the mounting base 31 on the other side. The transmission belt 34 is sleeved on the drive wheel 32 and the driven wheel. The second motor 35 is fixedly connected to the frame 1 and drives the drive wheel 32 to rotate. The cutting blade assembly includes a cutting blade holder 36 and a blade 37. The cutting blade holder 36 is fixedly connected to the transmission belt 34, and the blade 37 is fixedly connected to the cutting blade holder 36. Furthermore, the limiting protrusion 5 is provided with a clearance groove 51 to allow space for the blade 37. With the above structure, the second motor 35 drives the drive wheel 32 to rotate, thereby driving the transmission belt 34 to move. When the transmission belt 34 moves, it can drive the cutter holder 36 to move along the movement trajectory of the transmission belt 34, thereby driving the blade 37 to cut the bag.

[0045] The working principle of this utility model is as follows: As shown in the attached diagram, in the initial state, the film is conveyed by the feeding mechanism and passes through the heat-sealing mechanism 2, the cutting mechanism 3, and the pressing mechanism 4. As shown in the attached diagram, the second driving mechanism drives the upper pressure plate 41 to descend and press and fix the film, while the first driving mechanism drives the upper heat-sealing plate 21 to descend and heat-seal the film. Then, as shown in the attached diagram, the cutting mechanism 3 drives the blade 37 to cut the heat-sealed bag along the relief groove. After that, as shown in the attached diagram, the second driving mechanism drives the upper pressure plate 41 to descend again, pressing the cut end of the bag downwards to below the limiting protrusion 5. Finally, as shown in the attached diagram, the second driving mechanism drives the upper pressure plate 41 to rise and reset, and the abutment head 425, under the elastic force of the spring 423, pushes the bag upwards and fixes it below the limiting protrusion 5. The above steps are repeated to clamp and stack multiple bags as shown in the attached diagram.

[0046] 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 versatile bag cutting and folding device, characterized in that, The machine includes a heat sealing mechanism, a cutting mechanism, and a pressing mechanism arranged sequentially on a frame. The heat sealing mechanism includes an upper heat sealing plate, a lower heat sealing plate, and a first drive mechanism for driving the upper heat sealing plate to rise and fall. The pressing mechanism includes an upper pressure plate, a lower support assembly, and a second drive mechanism for driving the upper pressure plate to rise and fall. The lower support assembly includes a lower support plate, a support rod, and a spring. The lower support plate has several mounting slots. The support rod is slidably connected to the mounting slots. The upper end of the support rod has a push-off head, and the lower end of the support rod is fitted with a limiting block. The spring is fitted on the support rod. The upper end of the spring abuts against the push-off head, and the lower end of the spring abuts against the bottom wall of the mounting slot. The lower heat sealing plate has a limiting protrusion protruding towards the push-off head. The lower surface of the limiting protrusion abuts against the upper surface of the push-off head. The cutting mechanism cuts the heat-sealed bag.

2. The bag cutting and folding device with strong applicability according to claim 1, characterized in that, The lower support assembly also includes a first cylinder body, which is connected to the frame, and the piston rod of the first cylinder body is connected to the lower support plate.

3. The bag cutting and folding device with strong applicability according to claim 1, characterized in that, Insulating wood is provided on the lower surface of the upper hot-pressing plate and the upper surface of the lower hot-pressing plate. A heating wire is provided on the side of the insulating wood that is close to each other. The two heating wires are arranged vertically and vertically. Teflon cloth is covered on the outside of the insulating wood.

4. The bag cutting and folding device with strong applicability according to claim 1, characterized in that, The first driving mechanism includes a first motor, a drive shaft, a first cam, a first connecting rod, a sliding seat, and a transition block. The drive shaft is rotatably connected to the frame. The first motor is connected to the frame and drives the drive shaft to rotate. The first cam is sleeved on both ends of the drive shaft. The sliding seat is fixedly connected to both sides of the upper hot-pressing plate. The upper end of the first connecting rod is slidably connected to the sliding seat. The lower end of the first connecting rod is connected to the transition block. The transition block is provided with a first roller that is rotatably connected. The first roller is rotatably connected to the side wall of the first cam. The sliding seat is provided with a second cylinder. The piston rod of the second cylinder is fixedly connected to the upper end of the first connecting rod.

5. The bag cutting and folding device with strong applicability according to claim 4, characterized in that, The second drive mechanism includes a swing arm, a second cam, a second connecting rod, and a third connecting rod. The second cam is sleeved on both ends of the drive shaft, and the second connecting rod is connected to both sides of the upper pressure plate. The lower end of the second connecting rod is hinged to the upper end of the third connecting rod. The rear end of the swing arm is rotatably connected to the frame through a rotating shaft, and the front end of the swing arm is hinged to the lower end of the third connecting rod. The swing arm is provided with a second roller that is rotatably connected, and the second roller is rotatably connected to the second cam.

6. The bag cutting and folding device with strong applicability according to claim 5, characterized in that, The second cam includes an outer peripheral profile comprising a high-point holding trajectory segment, a first descending trajectory segment, a cutting holding trajectory segment, a second descending trajectory segment, and an ascending trajectory segment connected in sequence.

7. A highly adaptable bag cutting and folding device according to claim 5, characterized in that, The frame is provided with a guide base, and the first link and the second link are slidably connected to the guide base.

8. A highly adaptable bag cutting and folding device according to claim 7, characterized in that, The cutting mechanism includes a mounting base, a drive wheel, a driven wheel, a transmission belt, a second motor, and a cutting blade assembly. The mounting base is fixedly connected to the guide base. The drive wheel is rotatably connected to the mounting base on one side, and the driven wheel is rotatably connected to the mounting base on the other side. The transmission belt is sleeved on the drive wheel and the driven wheel. The second motor is fixedly connected to the frame and drives the drive wheel to rotate. The cutting blade assembly includes a cutting blade holder and a blade. The cutting blade holder is fixedly connected to the transmission belt, and the blade is fixedly connected to the cutting blade holder.

9. A highly adaptable bag cutting and folding device according to claim 8, characterized in that, The limiting protrusion is provided with a clearance groove to allow the blade to move.

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