Plastic bag folding mechanism
By combining the folding and lifting mechanisms of the two side moving plates, the problems of plastic bags spreading out and poor appearance during the insertion of the insert plate are solved, achieving a neat and beautiful folding effect for plastic bags.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 浙江易澄智能科技有限公司
- Filing Date
- 2025-09-03
- Publication Date
- 2026-08-04
AI Technical Summary
In existing technologies, plastic bags tend to unravel during insertion into the insert plate, resulting in uneven folding and poor aesthetics, especially as the ends cannot be concealed, affecting the appearance.
The device employs a method where two movable plates fold downwards from their close proximity, combined with a lifting mechanism supporting the shelf. When the plastic bag is laid flat, it supports the middle section and forms a clamping fold through the flipping of the movable plates. Precise folding is achieved using guide grooves, telescopic mechanisms, and motor drive.
It achieves neat and aesthetically pleasing folding of plastic bags, with the ends hidden inside, avoiding excessive overlap and improving the overall appearance and folding efficiency of the plastic bags.
Smart Images
Figure CN224588739U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of plastic bag manufacturing technology, and in particular to a plastic bag folding mechanism. Background Technology
[0002] During the production process of plastic bags, after stacks of plastic bags are folded, they are usually sent from the folding station to the bundling station by inserting a lower plate.
[0003] However, in the insert-down method, the insert cannot be placed at a folded position. If inserted at a folded position, the folded part of the plastic bag is prone to unfolding during the insertion process. Folding the left and right sides past the center insert position allows the insert to be positioned below the center, but this results in a bulky fold. Furthermore, it doesn't create an effective fold when the plastic bag is small. Therefore, the insert-down method limits the folding options for the plastic bag, requiring it to be folded away from the insert position before being inserted to achieve a proper fold.
[0004] Meanwhile, given the industry's requirements for the aesthetics of plastic bags, if the ends of the final folded plastic bags face outwards, the uneven, tilted state caused by differences in the binding method and thickness of the plastic bags is considered unsightly. There is a need for a folding method that can hide both ends of the plastic bags, but this effect is not easily achieved with existing insert-type folding plastic bag methods. Utility Model Content
[0005] The technical problem to be solved by this utility model is to address the above-mentioned technical deficiencies by providing a plastic bag folding mechanism. The mechanism uses two movable plates on both sides to fold downwards from their close proximity to form a fold. At the same time, a placement plate supported by a lifting mechanism supports the middle of the plastic bag when it is laid flat. When the two movable plates on both sides gradually flip inwards to a clamping state, the movable plates and the placement plate form a clamping grip on the plastic bag, and the two movable plates on both sides form a clamping fold on the plastic bag.
[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: It includes a frame, on which a pressure plate mechanism is provided. The frame is characterized by: movable plates on both sides; symmetrically mounted storage plates on the frame between the two movable plates, the storage plates being mounted on the frame via a lifting mechanism; the pressure plate mechanism being mounted on one side of the movable plates; and a bracket being mounted on one side of the movable plates; a lateral drive mechanism being installed between the bracket and the frame to drive the two movable plates to move towards each other; and a flipping mechanism being provided on the bracket to cause the two movable plates to approach each other, then flip downwards to form a relative clamping state, passing between the two storage plates when the movable plates flip downwards.
[0007] To further optimize this technical solution, the flipping motion mechanism also includes a guide groove for the movement of guide moving plates on the frame; the lower side of the bracket is slidably disposed in the guide groove, and the guide groove includes a flat part and a downward curved part that are connected; when the lower side of the bracket slides to the flat part, the moving plates on both sides are horizontally disposed; when the lower side of the bracket slides to the downward curved part, the moving plates on both sides are close to the vertical to form a relative clamping state.
[0008] To further optimize this technical solution, the lifting mechanism includes a mounting shaft rotatably mounted on the frame; a rotation drive mechanism disposed between the mounting shaft and the frame to drive the mounting shaft to rotate; and a push frame extending from the mounting shaft between two movable plates on both sides, wherein a telescopic mechanism is mounted on the push frame; and the placement plate is mounted on the telescopic end of the telescopic mechanism.
[0009] To further optimize this technical solution, the pusher extends to the underside of the shelf and is also equipped with a limiting rod; the underside of the shelf is slidably positioned within the limiting rod.
[0010] To further optimize this technical solution, the lateral drive mechanism includes a belt mounted on the frame and a motor that drives the belt to rotate; the brackets corresponding to the two movable plates on both sides are respectively mounted on the upper and lower parts of the belt on the same side.
[0011] To further optimize this technical solution, the lower sides of the lower bends on both sides are inclined in a direction that moves away from each other.
[0012] To further optimize this technical solution, the rotation drive mechanism is a cylinder installed between the mounting shaft and the frame; the mounting shaft extends radially outward with a mounting part; the cylinder is installed between the mounting part and the frame.
[0013] To further optimize this technical solution, the telescopic mechanism is a cylinder; the cylinder is installed between the push frame and the lower side of the shelf.
[0014] To further optimize this technical solution, a bent portion is provided in the middle of the storage panels on both sides near the side.
[0015] Compared with the prior art, the present invention has the following advantages: the two movable plates on both sides are folded down from their close proximity to form a fold, and at the same time, the placement plate supported by the lifting mechanism supports the middle part of the plastic bag when it is laid flat. When the two movable plates on both sides gradually flip inward to a clamping state, the movable plates and the placement plate form a clamping grip on the plastic bag, and at the same time, the two movable plates form a clamping fold on the plastic bag. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of the plastic bag folding mechanism.
[0017] Figure 2 This is a schematic diagram of the upper part of the plastic bag folding mechanism.
[0018] Figure 3 This is a partial structural diagram of the plastic bag folding mechanism.
[0019] In the diagram: 1. Frame; 2. Moving plate; 3. Support; 4. Guide groove; 5. Flat part; 6. Downward bend; 7. Pressure plate mechanism; 8. Storage plate; 9. Mounting shaft; 10. Rotation drive mechanism; 11. Telescopic mechanism; 12. Belt; 13. Motor; 14. Limit rod; 15. Mounting part; 16. Push frame; 17. Bending part. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.
[0021] Detailed implementation method: combined with Figure 1-3As shown, the plastic bag folding mechanism includes a frame 1, on which a pressure plate mechanism 7 is mounted. The pressure plate mechanism 7 is mounted on the frame via a reciprocating mechanism and reciprocates between the upper side of the shelf 8 and the upper side of the shelf 8. Movable plates 2 are mounted on both sides of the frame 1. Shelves 8 are symmetrically mounted on the frame 1 between the two movable plates 2. The shelves 8 are mounted on the frame 1 via a lifting mechanism. The pressure plate mechanism 7 is mounted on one side of the movable plates 2. A bracket 3 is mounted on one side of the movable plates 2. A lateral drive mechanism is installed between the bracket 3 and the frame 1 to drive the two movable plates 2 to move towards each other. A flipping mechanism is provided on the bracket 3 to make the two movable plates 2 move closer to each other and then flip downward to form a relative clamping state. When the movable plates 2 flip downward, they pass between the two shelf plates 8. The flipping mechanism also includes a guide groove 4 for the movement of a guide moving plate 2 mounted on the frame 1; the lower side of the support 3 is slidably disposed within the guide groove 4, and the guide groove 4 includes a communicating flat portion 5 and a downwardly curved portion 6; when the lower side of the support 3 slides to the flat portion 5, the moving plates 2 on both sides are horizontally positioned; when the lower side of the support 3 slides to the downwardly curved portion 6, the moving plates 2 on both sides are positioned close to the vertical to form a relative clamping state. The lifting mechanism includes a mounting shaft 9 rotatably mounted on the frame 1; a rotation drive mechanism 10 disposed between the mounting shaft 9 and the frame 1 to drive the mounting shaft 9 to rotate; and a push frame 16 extending from the mounting shaft 9 towards the moving plates 2 on both sides, on which a telescopic mechanism 11 is mounted; the shelf 8 is mounted on the telescopic end of the telescopic mechanism 11. The push frame 16 extends to the lower side of the shelf 8 and is also provided with a limit rod 14; the lower side of the shelf 8 is slidably disposed within the limit rod 14. The lateral drive mechanism includes a belt 12 mounted on the frame 1 and a motor 13 that drives the belt 12 to rotate; the brackets 3 corresponding to the two movable plates 2 are respectively mounted on the upper and lower parts of the belt 12 on the same side. The lower sides of the two lower bends (6) are inclined in a direction away from each other. The rotation drive mechanism 10 is a cylinder mounted between the mounting shaft 9 and the frame 1; the mounting shaft 9 extends radially outward with a mounting part 15; the cylinder is mounted between the mounting part 15 and the frame 1. The telescopic mechanism 11 is a cylinder; the cylinder is mounted between the push frame 16 and the lower side of the shelf 8. The middle of the shelf 8 on both sides is provided with a bending part 17 near the side to prevent it from being cut by sharp edges during the downward insertion of the movable plate 2.
[0022] When using, combine Figures 1-3The plastic bag is laid flat on the frame 1, with the middle of the bag on the shelf and the two sides on the moving plates 2. The pressure plate in the pressure plate mechanism 7 moves to the top of the plastic bag on the shelf via a reciprocating mechanism, and then pushes the shelf upwards via the telescopic mechanism 11, pressing the middle of the plastic bag firmly against the pressure plate. Then, the moving plates on both sides move towards the center, causing the moving plates 2 to fold the upper part of the plastic bag towards the center, folding the bag onto the top of the pressure plate. The pressure plate then moves laterally outwards under the drive of the reciprocating mechanism, squeezing the folded parts of the plastic bag between the moving plates 2 and the shelf 8. The motor 13 further drives the moving plates on both sides to continue folding inwards. During the folding process, the shelf 8 maintains pressure on the plastic bag while the drive mechanism 10 rotates. In conjunction with the telescopic mechanism 11, downward rotation and partial retraction are achieved. Finally, after the lower receiving plastic bag mechanism is ready, the telescopic mechanism 11 drives the lower placement plate 8 to retract completely, causing the plastic bag to detach from the clamp between the placement plate 8 and the moving plate 2 and fall downward into the lower receiving mechanism. During the folding process of the upper side of the plastic bag, as long as part of the plastic bag falls on the moving plate 2, the upper side of the plastic bag can be folded as the moving plate 2 moves laterally. At the same time, the moving plates 2 on both sides squeeze the folded plastic bag inward. The final folded plastic bag has no end exposed outside the plastic bag. The part of the plastic bag that has been clamped by the moving plate 2 and the placement plate 8 is covered. At the same time, the symmetrical folding avoids the excessive overlapping folding area when the plastic bag is folded by the excessive insertion plate, making the folded plastic bag more beautiful.
[0023] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art, which is common knowledge in the field. Furthermore, this utility model is mainly used to protect mechanical devices, so the control method and circuit connection will not be explained in detail.
[0024] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.
Claims
1. A plastic bag folding mechanism, comprising a frame (1), wherein a pressure plate mechanism (7) is provided on the frame (1), characterized in that: Movable plates (2) are provided on both sides of the frame (1); symmetrically installed storage plates (8) are installed on the frame (1) between the two movable plates (2). The storage plates (8) are installed on the frame (1) by a lifting mechanism. The pressure plate mechanism (7) is installed on one side of the movable plate (2). A bracket (3) is installed on one side of the movable plate (2). A lateral drive mechanism is installed between the bracket (3) and the frame (1) to drive the two movable plates (2) to move towards each other. A flipping motion mechanism is provided on the bracket (3) to make the two movable plates (2) move closer to each other and then flip down to form a relative clamping state. When the movable plate (2) flips down, it passes between the two storage plates (8).
2. The plastic bag folding mechanism according to claim 1, characterized in that: The flipping motion mechanism also includes a guide groove (4) for the movement of the guide moving plate (2) on the frame (1); the lower side of the bracket (3) is slidably disposed in the guide groove (4), and the guide groove (4) includes a connected flat part (5) and a lower curved part (6); when the lower side of the bracket (3) slides to the flat part (5), the moving plates (2) on both sides are horizontally disposed; when the lower side of the bracket (3) slides to the lower curved part (6), the moving plates (2) on both sides are close to the vertical to form a relative clamping state.
3. The plastic bag folding mechanism according to claim 1, characterized in that: The lifting mechanism includes a mounting shaft (9) rotatably mounted on the frame (1); a rotation drive mechanism (10) for driving the mounting shaft (9) to rotate, which is located between the mounting shaft (9) and the frame (1); and a pusher (16) extending from the mounting shaft (9) to the two side moving plates (2), wherein a telescopic mechanism (11) is mounted on the pusher (16); and the storage plate (8) is mounted on the telescopic end of the telescopic mechanism (11).
4. The plastic bag folding mechanism according to claim 3, characterized in that: The pusher (16) extends to the lower side of the shelf (8) and is also provided with a limiting rod (14); the lower side of the shelf (8) is slidably disposed within the limiting rod (14).
5. The plastic bag folding mechanism according to claim 2, characterized in that: The lateral drive mechanism includes a belt (12) mounted on the frame (1) and a motor (13) that drives the belt (12) to rotate; the brackets (3) corresponding to the two side moving plates (2) are respectively mounted on the upper and lower parts of the belt (12) on the same side.
6. The plastic bag folding mechanism according to claim 5, characterized in that: The lower curved portions (6) on both sides are inclined in a direction away from each other.
7. The plastic bag folding mechanism according to claim 3, characterized in that: The rotation drive mechanism (10) is a cylinder installed between the mounting shaft (9) and the frame (1); the mounting shaft (9) extends radially outward with a mounting part (15); the cylinder is installed between the mounting part (15) and the frame (1).
8. The plastic bag folding mechanism according to claim 3, characterized in that: The telescopic mechanism (11) is a cylinder; the cylinder is installed between the push frame (16) and the lower side of the shelf (8).
9. The plastic bag folding mechanism according to claim 1, characterized in that: The two side shelves (8) have a bent part (17) near the middle.