A double-folding device to prevent bags from wrinkling

Abstract

This utility model relates to the technical field of bag production equipment, and discloses a double-folding device to prevent bag wrinkling. It includes a frame, a feeding conveyor belt, a first clamping mechanism, an inclined tray, a material support platform, a first auxiliary roller, and a drive mechanism. The feeding conveyor belt is mounted on the frame, and the rear end of the inclined tray is hinged to the frame. A first cylinder is mounted on the frame, and the piston rod of the first cylinder is hinged to the front end of the inclined tray. The material support platform is located above the rear end of the inclined tray. The drive mechanism drives the first auxiliary roller to move repeatedly along the inclined direction on the frame. The first clamping mechanism is located above the inclined tray. This utility model enables automated double-folding operation, effectively preventing wrinkling during the folding process and further ensuring the flatness of the bag surface after folding.

Description

Technical Field

[0001] This utility model relates to the technical field of bag production equipment, specifically a double-folding device to prevent bags from wrinkling. Background Technology

[0002] With the rapid development of logistics packaging and daily consumer goods, long bags, such as film bags and non-woven bags with lengths of 2-5 meters, are increasingly widely used. This places higher demands on the automation and adaptability of equipment in their folding and storage processes. Early manual folding methods were labor-intensive, inefficient, and lacked consistent folding precision. For example, patent publication number CN222080244U discloses a folding device for facilitating the folding of long bags. While it achieves automated folding, it can only complete a single fold. For extra-long bags, the folded length still cannot meet the space requirements for warehousing and transportation, making it unsuitable for long bag storage scenarios.

[0003] Furthermore, in the above-mentioned scheme, since no guide roller assembly is set at the bag conveying path and folding station, the bag lacks effective guidance and leveling effect during the process of conveying the bag from the conveying mechanism to the folding mechanism. Uneven conveying speed and unbalanced force can easily cause wrinkles on the surface of the bag. Moreover, these wrinkles cannot be eliminated during the folding process, resulting in poor flatness of the folded bag and obvious irregular creases, which seriously affects the appearance quality of the product and its subsequent use.

[0004] In view of this, the applicant conducted in-depth research on the above-mentioned issues, which led to this case. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a double-folding device to prevent bag wrinkling, which can realize automated double-folding operation, effectively prevent wrinkling during the folding process, and further ensure the flatness of the bag surface after folding.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] A double-folding device for preventing bag wrinkling includes a frame, a feeding conveyor belt, a first clamping mechanism, an inclined tray, a material support platform, a first auxiliary roller, and a drive mechanism. The feeding conveyor belt is located at the front end of the frame, and the rear end of the inclined tray is hinged to the bottom of the frame. A first cylinder is mounted on the frame, and the piston rod of the first cylinder is hinged to the front end of the inclined tray. The material support platform is located above the rear end of the inclined tray. The drive mechanism includes a first guide rail, a roller slider, a first transmission belt, a first driving wheel, a first driven wheel, a second driven wheel, and a tensioning wheel that are rotatably connected to the frame. The first transmission belt is wound around the first driving wheel, the first driven wheel, the second driven wheel, and the tensioning wheel. The first guide rail is inclinedly connected to the inner wall of the frame. The roller slider is slidably connected to the first guide rail and fixedly connected to the first transmission belt. The two ends of the first auxiliary roller are rotatably connected to the roller sliders on both sides. The first clamping mechanism is located above the inclined tray.

[0008] Furthermore, the first gripping mechanism includes a first gripper, a second guide rail, a gripper slide, a second cylinder, a first gripping crossbar, and a gripper drive assembly. The second guide rail is located on the inner walls of both sides of the frame. The gripper slide is slidably connected to the second guide rail. The second cylinder is connected to the gripper slide. The two ends of the first gripping crossbar are connected to the piston rods of the two second cylinders. The first gripper is mounted on the first gripping crossbar. The gripper drive assembly includes a second driving wheel, a fourth driven wheel, and a second transmission belt. The second driving wheel and the fourth driven wheel are rotatably connected to the side walls of the frame. The second transmission belt is sleeved on the second driving wheel and the fourth driven wheel. The gripper slide is fixedly connected to the second transmission belt.

[0009] Furthermore, a third cylinder is provided on both sides of the frame, located above the rear end of the material support platform, and a second auxiliary roller is rotatably connected to the piston rod of the third cylinder.

[0010] Furthermore, a clamping mechanism is provided at the rear end of the material support platform. The clamping mechanism includes a pressure plate, a first support plate, a first lifting frame, a second lifting frame, a fourth cylinder, and a fifth cylinder. The pressure plate is correspondingly located above the first support plate. The first support plate is provided with a first clearance hole. The fourth and fifth cylinders are fixedly connected to the frame. The piston rod of the fourth cylinder is connected to the first lifting frame. The pressure plate is fixedly connected to the lower surface of the first lifting frame. The piston rod of the fifth cylinder is connected to the second lifting frame. The first support plate is fixedly connected to the upper surface of the second lifting frame.

[0011] Furthermore, a second clamping mechanism is provided behind the clamping mechanism. The second clamping mechanism includes a second gripper, a third guide rail, a second clamping crossbar, a third driving wheel, a fifth driven wheel, and a third transmission belt. The third guide rail is provided on the inner walls of both sides of the frame. The third driving wheel and the fifth driven wheel are rotatably connected to the side walls of the frame. The third transmission belt is sleeved on the third driving wheel and the fifth driven wheel. The two ends of the second clamping crossbar are slidably connected to the third guide rail, and the two ends of the second clamping crossbar are fixedly connected to the third transmission belt. The second gripper is connected to the second clamping crossbar.

[0012] Furthermore, a movable platform is provided below the second clamping mechanism. The movable platform includes a platform, a movable base, a lifting assembly, a fourth guide rail, a fourth driving wheel, a sixth driven wheel, and a fourth transmission belt. The fourth guide rail is located on the inner walls of both sides of the frame. The fourth driving wheel and the sixth driven wheel are rotatably connected to the side walls of the frame. The fourth transmission belt is sleeved on the fourth driving wheel and the sixth driven wheel. The two ends of the movable base are slidably connected to the fourth guide rail and fixedly connected to the fourth transmission belt. The lifting assembly is symmetrically arranged on the movable base and drives the platform to move up and down.

[0013] Furthermore, the lifting assembly includes a first slider, a second slider, a first connecting rod, a second connecting rod, a first lead screw, and a second lead screw. The first slider and the second slider are slidably connected to the movable base, and the first slider and the second slider are symmetrically arranged on both sides of the movable base. The first slider is provided with a first drive plate, and the second slider is provided with a second drive plate. The upper end of the first connecting rod is hinged to the lower surface of the platform, and the lower end of the first connecting rod is hinged to the first slider. The upper end of the second connecting rod is hinged to the lower surface of the platform, and the lower end of the second connecting rod is hinged to the second slider. The first lead screw and the second lead screw are rotatably connected to the movable base, and the helical directions of the first lead screw and the second lead screw are opposite. The first drive plate is provided with a first nut block that is threadedly connected to the first lead screw, and the second drive arm is provided with a second nut block that is threadedly connected to the second lead screw.

[0014] Furthermore, the upper surface of the platform is provided with several anti-slip ridges extending laterally.

[0015] Furthermore, a third clamping mechanism is provided behind the second clamping mechanism, and a discharge conveyor belt is provided below the third clamping mechanism. The third clamping mechanism includes a third gripper, a fifth guide rail, a third clamping crossbar, a fifth driving wheel, a seventh driven wheel, and a fifth transmission belt. The fifth guide rail is provided on the inner walls of both sides of the frame. The fifth driving wheel and the seventh driven wheel are rotatably connected to the side walls of the frame. The fifth transmission belt is sleeved on the fifth driving wheel and the seventh driven wheel. The two ends of the third clamping crossbar are slidably connected to the fifth guide rail, and the two ends of the third clamping crossbar are fixedly connected to the fifth transmission belt. The third gripper is connected to the third clamping crossbar.

[0016] Furthermore, a second support plate is provided at the rear end of the feeding conveyor belt. The second support plate is fixedly connected to the frame and has a second clearance hole.

[0017] This invention provides a double-folding device to prevent bags from wrinkling. It has the following beneficial effects:

[0018] 1. This utility model solves the problem of bag wrinkling during folding and significantly improves the flatness of the fold. Driven by the drive mechanism, the first auxiliary roller can move dynamically along the inclined first guide rail in rhythm with the bag conveying, which not only provides continuous guidance to the bag to avoid conveying deviation, but also smooths out potential wrinkles on the bag surface in real time. The second auxiliary roller above the rear end of the material support platform is driven down at the folding station by the third cylinder to press against the bag surface for secondary flattening, preventing the folding force from aggravating wrinkles, effectively making up for the defect of traditional devices without guide rollers.

[0019] 2. This utility model achieves automated double folding of long bags, significantly improving folding efficiency and adaptability. After the initial fold, the pressing mechanism secures the bag to the first support plate from both above and below, preventing displacement. The second clamping mechanism then transfers the bag to a moving platform to complete the second fold. This achieves fully automated workflow, adaptable to large-scale production and with a wide range of applications. From automatic feeding onto the conveyor belt to the third clamping mechanism transferring the folded bag to the discharge conveyor belt, a fully automated closed loop is formed, requiring no manual intervention.

[0020] 3. In this utility model, the second support plate at the rear end of the feeding conveyor belt and the first support plate at the material support platform are designed with clearance holes to provide clearance space for the clamping mechanism, avoiding squeezing and wrinkling of the bag surface during clamping, and further ensuring the flatness of the bag surface. At the same time, the modular design of each mechanism in this utility model facilitates later maintenance and replacement, reduces equipment failure rate, and is generally adaptable to the needs of large-scale production, making it applicable to a wide range of scenarios. Attached Figure Description

[0021] Figure 1 This is a perspective view of the external structure of this utility model;

[0022] Figure 2 A diagram showing the bag laid flat on an inclined tray;

[0023] Figure 3 This is a schematic diagram showing the state of the first gripper when it picks up the bag.

[0024] Figure 4 This is a schematic diagram showing the state of the second gripper when it is picking up the bag.

[0025] Figure 5 This is a diagram illustrating the state of a folded bag being dragged onto a material tray.

[0026] Figure 6A schematic diagram showing the state of the second gripper gripping the middle of a folded bag;

[0027] Figure 7 This is a schematic diagram showing the state of a double-folded bag being dragged onto a loading platform.

[0028] Figure 8 This is a schematic diagram showing the third gripper picking up the double-folded bag and placing it onto the discharge conveyor belt.

[0029] Figure 9 This is a schematic diagram of the internal structure of the present invention;

[0030] Figure 10 This is a schematic diagram of the mobile platform structure.

[0031] The components include: frame 1, feeding conveyor belt 11, second support plate 111, second clearance hole 112, material support platform 12, third cylinder 13, second auxiliary roller 14, pressure plate 151, first lifting frame 152, fourth cylinder 153, first support plate 161, second lifting frame 162, fifth cylinder 163, first clearance hole 164, discharge conveyor belt 17, first clamping mechanism 2, first gripper 21, second guide rail 22, gripper slide 23, second cylinder 24, first clamping crossbar 25, second driving wheel 26, fourth driven wheel 27, second transmission belt 28, inclined support plate 3, first cylinder 31, first auxiliary roller 4, first guide rail 41, roller slider 42, first transmission belt 43, first driving wheel 44, first driven wheel 45, second... Driven wheel 46, tension wheel 47, second clamping mechanism 5, second gripper 51, third guide rail 52, second clamping crossbar 53, third driving wheel 54, fifth driven wheel 55, third transmission belt 56, moving platform 6, loading platform 61, anti-slip convex strip 611, moving base 62, fourth guide rail 63, fourth driving wheel 64, sixth driven wheel 65, fourth transmission belt 66, first slider 671, second slider 672, first connecting rod 673, second connecting rod 674, first lead screw 675, second lead screw 676, first drive plate 677, second drive plate 678, third clamping mechanism 7, third gripper 71, fifth guide rail 72, third clamping crossbar 73, fifth driving wheel 74, seventh driven wheel 75, fifth transmission belt 76, bag 8. Detailed Implementation

[0032] 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.

[0033] Please see the appendix Figure 1- Appendix Figure 10 This utility model provides a double-folding device for preventing bag wrinkling, including a frame 1, a feeding conveyor belt 11, a first clamping mechanism 2, an inclined support plate 3, a material support platform 12, a first auxiliary roller 4, and a driving mechanism. The feeding conveyor belt 11 is located at the front end of the frame 1. The inclined support plate 3 is gradually inclined downwards from front to back, and its rear end is hinged to the bottom of the frame 1. A first cylinder 31 is provided on the frame 1, and its lower end is hinged to the frame 1. The piston rod of the first cylinder 31 is hinged to the front end of the inclined support plate 3. The first cylinder 31 can drive the front end of the inclined support plate 3 to swing up and down. A second support plate 111 is provided at the rear end of the feeding conveyor belt 11. The second support plate 111 is fixedly connected to the frame 1. The second support plate 111 is provided with a second clearance hole 112, which provides clearance space for the first gripper 21. When the inclined pallet 3 swings downward, a certain space is formed at the lower end of the second support plate 111, allowing the first gripper 21 to approach the second support plate 111 and grasp the bag 8 on the second support plate 111. The material support platform 12 is fixedly connected above the rear end of the inclined pallet 3. The drive mechanism includes a first guide rail 41, a roller slider 42, a first transmission belt 43, a first driving wheel 44, a first driven wheel 45, a second driven wheel 46, and a tension wheel 47, which are rotatably connected to the inner sidewalls on both sides of the frame 1. The first transmission belt 43 is wound around the first driving wheel 44, the first driven wheel 45, the second driven wheel 46, and the tension wheel 47. The first driving wheel 44 can be driven to rotate by a motor, and the two first driving wheels 44 on both sides can be connected by a synchronous shaft to ensure that the two sides can drive synchronously. The rear end of the first guide rail 41 is inclined downwards and connected to the inner wall of the frame 1. The roller slider 42 is slidably connected to the first guide rail 41 and fixedly connected to the first transmission belt. The two ends of the first auxiliary roller 4 are rotatably connected to the roller sliders 42 on both sides. The first clamping mechanism 2 is located above the inclined support plate 3. With the above structure, the first drive wheel 44 is driven by the motor to rotate, thereby driving the first transmission belt 43 and the roller slider 42 to move. The roller slider 42 can move repeatedly along the first guide rail 41. When the first clamping mechanism 2 approaches the second support plate 111 to clamp the bag 8 and fold the bag 8 once, the drive mechanism drives the first auxiliary roller 4 to move upwards, guiding the bag 8 on the inclined support plate 3 and the feeding conveyor belt 11 as it is dragged by the first clamping mechanism 2, making the movement of the bag 8 more stable during the folding process and preventing the bag 8 from shifting and wrinkling.

[0034] In this embodiment, the first gripping mechanism 2 includes a first gripper 21, a second guide rail 22, a gripper slide 23, a second cylinder 24, a first gripping crossbar 25, and a gripper drive assembly. The second guide rail 22 is horizontally arranged on the inner walls of both sides of the frame 1. The second guide rail 22 is located directly above the first guide rail 41. The gripper slide 23 is slidably connected to the second guide rail 22. The second cylinder 24 is connected to the gripper slide 23. The two ends of the first gripping crossbar 25 are connected to the piston rods of the two second cylinders 24. A plurality of first grippers 21 are arrayed and installed on the first gripping crossbar 25. The second cylinder 24 can drive the first grippers 21 to perform lifting and lowering movements. More specifically, the gripper drive assembly includes a second driving wheel 26, a fourth driven wheel 27, and a second transmission belt 28. The second driving wheel 26 can be driven to rotate by a motor. The second driving wheel 26 and the fourth driven wheel 27 are rotatably connected to the two side walls of the frame 1. The second transmission belt 28 is sleeved on the second driving wheel 26 and the fourth driven wheel 27. The gripper slide 23 is fixedly connected to the second transmission belt 28. By driving the second driving wheel 26 to rotate by a motor, the second transmission belt 28 and the gripper slide 23 move back and forth, thereby driving the first gripper 21 to translate horizontally.

[0035] In this embodiment, a third cylinder 13 is provided on both side walls of the frame 1. The third cylinder 13 is located above the rear end of the material support platform 12, and a second auxiliary roller 14 is rotatably connected to the piston rod of the third cylinder 13. The third cylinder 13 can drive the second auxiliary roller 14 to descend. Thus, during the first folding and backward dragging of the bag 8, the third cylinder 13 drives the second auxiliary roller 14 to descend onto the material support platform 12, guiding the dragged bag 8 and preventing the bag 8 from wrinkling. When the first support plate 161 moves upward, the second auxiliary roller 14 moves upward to prevent the mechanism from colliding. Then, during the second folding process, the second auxiliary roller 14 continues to descend to press the bag 8 tightly, preventing the bag 8 from wrinkling during the folding process. In addition, a clamping mechanism is provided at the rear end of the material support platform 12. The clamping mechanism includes a pressure plate 151, a first support plate 161, a first lifting frame 152, a second lifting frame 162, a fourth cylinder 153, and a fifth cylinder 163. The pressure plate 151 is correspondingly located above the first support plate 161. The first support plate 161 is provided with a first clearance hole 164, which can provide clearance for the second gripper 51. The fourth cylinder 153 and the fifth cylinder 163 are fixedly connected to the frame 1. The piston rod of the fourth cylinder 153 is connected to the first lifting frame 152. The pressure plate 151 is fixedly connected to the lower surface of the first lifting frame 152. The piston rod of the fifth cylinder 163 is connected to the second lifting frame 162. The first support plate 161 is fixedly connected to the upper surface of the second lifting frame 162. With the above structure, the fourth cylinder 153 can drive the pressure plate 151 to move up and down, and the fifth cylinder 163 can drive the first support plate 161 to move up and down. When the pressure plate 151 descends, it can press the bag 8 on the first support plate 161 to prevent the bag 8 from shifting and further improve the accuracy of gripping the bag 8.

[0036] In this embodiment, a second clamping mechanism 5 is provided behind the clamping mechanism. The second clamping mechanism 5 includes a second gripper 51, a third guide rail 52, a second clamping crossbar 53, a third driving wheel 54, a fifth driven wheel 55, and a third transmission belt 56. The third guide rail 52 is provided on the inner walls of both sides of the frame 1. The third driving wheel 54 and the fifth driven wheel 55 are rotatably connected to the side walls of the frame 1. The third transmission belt 56 is sleeved on the third driving wheel 54 and the fifth driven wheel 55. In addition, multiple guide wheels are provided on the third transmission belt 56 to ensure that the third transmission belt 56 can run smoothly. The two ends of the second clamping crossbar 53 are slidably connected to the third guide rail 52, and the two ends of the second clamping crossbar 53 are fixedly connected to the third transmission belt 56. The second gripper 51 is connected to the second clamping crossbar 53. The motor can drive the third drive wheel 54 to rotate, thereby driving the second gripper 51 to move back and forth along the third guide rail 52, so that the second gripper 51 can grip the bag 8 on the first support plate 161.

[0037] In this embodiment, a movable platform 6 is provided below the second clamping mechanism 5. The movable platform 6 includes a platform 61, a movable base 62, a lifting assembly, a fourth guide rail 63, a fourth driving wheel 64, a sixth driven wheel 65, and a fourth transmission belt 66. The fourth guide rail 63 is provided on the inner walls of both sides of the frame 1. The fourth driving wheel 64 and the sixth driven wheel 65 are rotatably connected to the side walls of the frame 1. The fourth transmission belt 66 is sleeved on the fourth driving wheel 64 and the sixth driven wheel 65. The two ends of the movable base 62 are slidably connected to the fourth guide rail 63, and the two ends of the movable base 62 are fixedly connected to the fourth transmission belt 66. The fourth driving wheel 64 can be driven to rotate by a motor, thereby driving the fourth transmission belt 66 to move the movable base 62 horizontally back and forth. The lifting assembly is symmetrically arranged on the movable base 62, and the lifting assembly drives the platform 61 to move up and down. The lifting assembly includes a first slider 671, a second slider 672, a first connecting rod 673, a second connecting rod 674, a first lead screw 675, and a second lead screw 676. The first slider 671 and the second slider 672 are slidably connected to the movable base 62, and the first slider 671 and the second slider 672 are symmetrically arranged on both sides of the movable base 62. The first slider 671 is provided with a first drive plate 677, and the second slider 672 is provided with a second drive plate 678. The upper end of the first connecting rod 673 is connected to the lower surface of the platform 61. The lower end of the first connecting rod 673 is hinged to the first slider 671, the upper end of the second connecting rod 674 is hinged to the lower surface of the platform 61, and the lower end of the second connecting rod 674 is hinged to the second slider 672. The first lead screw 675 and the second lead screw 676 are rotatably connected to the movable base 62, and the helical directions of the first lead screw 675 and the second lead screw 676 are opposite. The first drive plate 677 is provided with a first nut block that is threadedly connected to the first lead screw 675, and the second drive arm is provided with a second nut block that is threadedly connected to the second lead screw 676. The first lead screw 675 and the second lead screw 676 on the lifting assembly are connected together by an adapter and are synchronously driven to rotate by the same motor. The motor can synchronously drive the first lead screw 675 and the second lead screw 676 to rotate forward or reverse together, thereby causing the first slider 671 and the second slider 672 to move away from or towards each other. When the first slider 671 and the second slider 672 move away from each other, the lower ends of the first connecting rod 673 and the second connecting rod 674 move away from each other, and the platform 61 descends. When the first slider 671 and the second slider 672 move towards each other, the lower ends of the first connecting rod 673 and the second connecting rod 674 move towards each other, and the platform 61 is lifted up and moves upward. The upper surface of the platform 61 is provided with several anti-slip ridges 611 extending laterally, which can prevent the bag 8 from slipping during the conveying process.

[0038] In this embodiment, a third gripping mechanism 7 is provided behind the second gripping mechanism 5, and a discharge conveyor belt 17 is provided below the third gripping mechanism 7. The third gripping mechanism 7 includes a third gripper 71, a fifth guide rail 72, a third gripping crossbar 73, a fifth driving wheel 74, a seventh driven wheel 75, and a fifth transmission belt 76. The fifth guide rail 72 is provided on the inner walls of both sides of the frame 1. The fifth driving wheel 74 and the seventh driven wheel 75 are rotatably connected to the side walls of the frame 1. The fifth transmission belt 76 is sleeved on the fifth driving wheel 74 and the seventh driven wheel 75. The two ends of the third gripping crossbar 73 are slidably connected to the fifth guide rail 72, and the two ends of the third gripping crossbar 73 are fixedly connected to the fifth transmission belt 76. The third gripper 71 is connected to the third gripping crossbar 73. The fifth driving wheel 74 can be driven to rotate by a motor, thereby driving the third gripper 71 to move back and forth along the fifth guide rail 72, so that the third gripper 71 can grip the bag 8 on the platform 61.

[0039] The specific working principle of this utility model is as follows: (see attached) Figure 2 As shown, the feeding conveyor belt 11 transports the bag 8 and lays it flat on the inclined pallet 3. Then, the first cylinder 31 drives the front end of the inclined pallet 3 to swing downward, creating a space below the second support plate 111 for the first gripper 21 to grasp the bag 88. (See attached diagram) Figure 3 As shown, the first gripper 21 descends and moves forward toward the second support plate 111, clamping the middle of the bag 8 on the second support plate 111. (See attached diagram) Figure 4 As shown, the first gripper 21 then picks up the folded bag 8 and moves it backward to the front of the second gripper 51. The second gripper 51 clamps the front end of the folded bag 8, and then the first gripper 21 releases the bag 8 and moves upward to reset. During one folding process, the first auxiliary roller 4 moves upward to the middle position of the first guide rail 41, so that the first gripper 21 can guide the upper and lower layers of bags 8 during the gripping and dragging process, making the movement of the bag 8 more stable during folding and dragging, and preventing the bag 8 from wrinkling. (See attached image) Figure 5 As shown, the upper surface of the first support plate 161 moves to the same height as the upper surface of the material support table 12. The second gripper 51 drags the folded bag 8 backward, placing the end of the folded bag 8 on the material support table 12. Then, the pressure plate 151 moves downward to press the middle of the bag 8 firmly onto the first support plate 161. During the backward dragging of the folded bag 8, the second auxiliary roller 14 descends onto the material support table 12 to guide the dragged bag 8 and prevent it from wrinkling. (See attached diagram) Figure 6As shown, the stage 61 moves backward to make room, and the second gripper 51 first releases the bag 8, allowing the front end of the first-folded bag 8 to hang down naturally. Then, the pressure plate 151 and the first support plate 161 move upward to lift the middle of the first-folded bag 8. After that, the second gripper 51 moves forward to grip the middle of the bag 8 on the first support plate 161, completing the second folding gripping. When the first support plate 161 moves upward, the second auxiliary roller 14 moves upward to avoid collisions in the mechanism. Then, during the second folding process, the second auxiliary roller 14 continues to descend to press the bag 8 firmly, preventing the bag 8 from wrinkling during the folding process. (See attached image) Figure 7 As shown, the second gripper 51 moves backward to pick up the double-folded bag 8 and place it on the platform 61. (See attached image) Figure 8 As shown, the platform 61 moves to the front end of the discharge conveyor belt 17, and then the third gripper 71 moves forward to grip the double-folded bag 8 and drags the bag 8 backward onto the discharge conveyor belt 17, and finally it is sent out for collection by the feeding conveyor belt.

[0040] 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 double-folding device for preventing bags from wrinkling, characterized in that... The system includes a frame, a feeding conveyor belt, a first clamping mechanism, an inclined pallet, a material support platform, a first auxiliary roller, and a drive mechanism. The feeding conveyor belt is located at the front end of the frame, and the rear end of the inclined pallet is hinged to the bottom of the frame. A first cylinder is mounted on the frame, and the piston rod of the first cylinder is hinged to the front end of the inclined pallet. The material support platform is located above the rear end of the inclined pallet. The drive mechanism includes a first guide rail, a roller slider, a first transmission belt, a first driving wheel, a first driven wheel, a second driven wheel, and a tensioning wheel that are rotatably connected to the frame. The first transmission belt is wound around the first driving wheel, the first driven wheel, the second driven wheel, and the tensioning wheel. The first guide rail is inclinedly connected to the inner wall of the frame. The roller slider is slidably connected to the first guide rail and fixedly connected to the first transmission belt. The two ends of the first auxiliary roller are rotatably connected to the roller sliders on both sides. The first clamping mechanism is located above the inclined pallet.

2. The double-folding device for preventing bag wrinkling according to claim 1, characterized in that... The first gripping mechanism includes a first gripper, a second guide rail, a gripper slide, a second cylinder, a first gripping crossbar, and a gripper drive assembly. The second guide rail is located on the inner walls of both sides of the frame. The gripper slide is slidably connected to the second guide rail. The second cylinder is connected to the gripper slide. The two ends of the first gripping crossbar are connected to the piston rods of the two second cylinders. The first gripper is mounted on the first gripping crossbar. The gripper drive assembly includes a second driving wheel, a fourth driven wheel, and a second transmission belt. The second driving wheel and the fourth driven wheel are rotatably connected to the side walls of the frame. The second transmission belt is sleeved on the second driving wheel and the fourth driven wheel. The gripper slide is fixedly connected to the second transmission belt.

3. The double-folding device for preventing bag wrinkling according to claim 2, characterized in that... The machine frame has a third cylinder on both sides, which is located above the rear end of the material support platform. The piston rod of the third cylinder is equipped with a second auxiliary roller that is rotatably connected.

4. A double-folding device for preventing bag wrinkling according to claim 3, characterized in that... The rear end of the material support platform is equipped with a pressing mechanism, which includes a pressure plate, a first support plate, a first lifting frame, a second lifting frame, a fourth cylinder, and a fifth cylinder. The pressure plate is correspondingly located above the first support plate. The first support plate is provided with a first clearance hole. The fourth and fifth cylinders are fixedly connected to the frame. The piston rod of the fourth cylinder is connected to the first lifting frame. The pressure plate is fixedly connected to the lower surface of the first lifting frame. The piston rod of the fifth cylinder is connected to the second lifting frame. The first support plate is fixedly connected to the upper surface of the second lifting frame.

5. A double-folding device for preventing bag wrinkling according to claim 4, characterized in that... A second clamping mechanism is provided behind the clamping mechanism. The second clamping mechanism includes a second gripper, a third guide rail, a second clamping crossbar, a third driving wheel, a fifth driven wheel, and a third transmission belt. The third guide rail is provided on the inner walls of both sides of the frame. The third driving wheel and the fifth driven wheel are rotatably connected to the side walls of the frame. The third transmission belt is sleeved on the third driving wheel and the fifth driven wheel. The two ends of the second clamping crossbar are slidably connected to the third guide rail, and the two ends of the second clamping crossbar are fixedly connected to the third transmission belt. The second gripper is connected to the second clamping crossbar.

6. A double-folding device for preventing bag wrinkling according to claim 5, characterized in that... Below the second clamping mechanism is a movable platform, which includes a platform, a movable base, a lifting assembly, a fourth guide rail, a fourth driving wheel, a sixth driven wheel, and a fourth transmission belt. The fourth guide rail is located on the inner walls of both sides of the frame. The fourth driving wheel and the sixth driven wheel are rotatably connected to the side walls of the frame. The fourth transmission belt is sleeved on the fourth driving wheel and the sixth driven wheel. The two ends of the movable base are slidably connected to the fourth guide rail and fixedly connected to the fourth transmission belt. The lifting assembly is symmetrically located on the movable base and drives the platform to move up and down.

7. A double-folding device for preventing bag wrinkling according to claim 6, characterized in that... The lifting assembly includes a first slider, a second slider, a first connecting rod, a second connecting rod, a first lead screw, and a second lead screw. The first slider and the second slider are slidably connected to the movable base, and the first slider and the second slider are symmetrically arranged on both sides of the movable base. The first slider is provided with a first drive plate, and the second slider is provided with a second drive plate. The upper end of the first connecting rod is hinged to the lower surface of the platform, and the lower end of the first connecting rod is hinged to the first slider. The upper end of the second connecting rod is hinged to the lower surface of the platform, and the lower end of the second connecting rod is hinged to the second slider. The first lead screw and the second lead screw are rotatably connected to the movable base, and the helical directions of the first lead screw and the second lead screw are opposite. The first drive plate is provided with a first nut block that is threadedly connected to the first lead screw, and the second drive arm is provided with a second nut block that is threadedly connected to the second lead screw.

8. A double-folding device for preventing bag wrinkling according to claim 7, characterized in that... The upper surface of the platform is provided with several anti-slip ridges extending laterally.

9. A double-folding device for preventing bag wrinkling according to claim 7, characterized in that... A third clamping mechanism is provided behind the second clamping mechanism, and a discharge conveyor belt is provided below the third clamping mechanism. The third clamping mechanism includes a third gripper, a fifth guide rail, a third clamping crossbar, a fifth driving wheel, a seventh driven wheel, and a fifth transmission belt. The fifth guide rail is provided on the inner walls of both sides of the frame. The fifth driving wheel and the seventh driven wheel are rotatably connected to the side walls of the frame. The fifth transmission belt is sleeved on the fifth driving wheel and the seventh driven wheel. The two ends of the third clamping crossbar are slidably connected to the fifth guide rail, and the two ends of the third clamping crossbar are fixedly connected to the fifth transmission belt. The third gripper is connected to the third clamping crossbar.

10. A double-folding device for preventing bag wrinkling according to claim 1, characterized in that... , The rear end of the feeding conveyor belt is provided with a second support plate, which is fixedly connected to the frame. The second support plate is provided with a second clearance hole.

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