Edge folding device for plastic bag production

Abstract

The utility model mainly relates to the technical field of plastic bag processing, in particular to an edge folding device for plastic bag production, which comprises symmetrically distributed support frames, a first mounting plate and a second mounting plate are respectively arranged on opposite sides of the two support frames, and a gap between the first mounting plate and the second mounting plate is gradually reduced from top to bottom. A plurality of first guide rollers are rotatably mounted between the two first mounting plates, a plurality of second guide rollers are rotatably mounted between the two second mounting plates, the first guide rollers are linearly and uniformly distributed in the length direction of the first mounting plates, and the second guide rollers are linearly and uniformly distributed in the length direction of the second mounting plates; a movable plate is installed on one supporting frame, the length of a rotating frame fixed to the movable plate is gradually increased from top to bottom, and therefore all the edge folding wheels can gradually extrude the plastic bags from shallow to deep, and the situation that the extrusion depth is large, so that the plastic bags deform, and the machining yield is affected is avoided.

Description

Technical Field

[0001] This utility model mainly relates to the field of plastic bag processing technology, specifically to a folding device for plastic bag production. Background Technology

[0002] In plastic bag production, folding is the core process for forming an "M"-shaped accordion edge (also known as a gusseted edge or gusseted bag structure), mainly achieved through equipment such as folding guide tubes. Folding the two sides of the flat bag inward transforms the bag body from an oval opening into a rectangle. The folded edges form a closed structure similar to accordion blades, significantly reducing the space occupied during storage and transportation. The three-dimensional edge formed after folding improves the bag's compression resistance, prevents the bag walls from sticking together, and facilitates the loading and unloading of contents, making it especially suitable for dustproof packaging or scenarios requiring upright placement.

[0003] CN214688184U discloses an inserting device for folding the edges of plastic bags, including an inserting machine frame and a guide frame mounted on a work platform, as well as a column, an adjusting screw, and a folding wheel assembly. The column is symmetrically fixedly installed on both sides of the inserting machine frame. The adjusting screw is threaded to the column and extends out of the column. A handwheel is fixedly installed at one end of the adjusting screw, and a top block is fixedly installed at the other end. The folding wheel assembly is fixedly equipped with a top block seat. The top block is coaxially matched and falls into the top block seat with its outer end face tightly abutting the top block seat. A split pressure plate is coaxially installed on the top block. The split pressure plate is located above the top block and is fixedly connected to the top block seat by bolts. The folding wheel assembly has a number of folding wheels with progressively decreasing widths and free rotation arranged from bottom to top.

[0004] The aforementioned existing technologies enable the bag body to fold inwards linearly, uniformly, and symmetrically on both sides, improving the positioning accuracy of the insert edge and thus increasing the product yield. However, since all folding wheels are located on a uniform vertical line, the folding of the bag body is formed in one step. When the folding depth is large, it can easily cause bag deformation, thereby affecting the yield rate. Utility Model Content

[0005] 1. The technical problem to be solved by the utility model:

[0006] This utility model provides a folding device for plastic bag production, which solves the technical problems existing in the background art.

[0007] 2. Technical Solution:

[0008] To achieve the above objectives, the technical solution provided by this utility model is as follows: a folding device for plastic bag production, comprising symmetrically distributed support frames, each of the two support frames having a first mounting plate and a second mounting plate on its opposite sides, the gap between the first mounting plate and the second mounting plate gradually decreasing from top to bottom, a plurality of first guide rods rotatably mounted between the two first mounting plates, and a plurality of second guide rods rotatably mounted between the two second mounting plates, the first guide rods being linearly and uniformly distributed along the length direction of the first mounting plate, and the second guide rods being linearly and uniformly distributed along the length direction of the second mounting plate;

[0009] One of the support frames is equipped with a movable plate located between the first mounting plate and the second mounting plate of the support frame. The movable plate can be driven to move along the axial direction of the first guide rod and the second guide rod. Several vertically equidistant rotating frames are fixed on the side of the movable plate away from the support frame. The length of the rotating frames gradually increases from top to bottom. Each rotating frame is equipped with a folding wheel at its end.

[0010] Furthermore, the movable plate is threadedly connected to a drive screw and fixedly installed with a guide slide rod. Both the drive screw and the guide slide rod extend along the axial direction of the first guide rod and the second guide rod, and are respectively rotatably connected to and slidably connected to the corresponding support frame.

[0011] Furthermore, the end of the drive screw is equipped with a first grip, which is symmetrically distributed on the movable plate along with the guide slide.

[0012] Furthermore, the first mounting plate and the second mounting plate are rotatably connected to the corresponding support frame via a first rotating shaft and a second rotating shaft, respectively, wherein a set of first rotating shafts and second rotating shafts located on the same side are driven by each other through their fixed gears.

[0013] Furthermore, a worm gear is fixed on one of the first or second rotating shafts, the worm gear meshes with a worm, one end of the worm is fitted with a second handle, and is rotatably connected to a mounting bracket provided on the corresponding support frame.

[0014] 3. Beneficial effects:

[0015] Compared with the prior art, the technical solution provided by this utility model has the following advantages: the rotating frame fixed on the movable plate gradually increases in length from top to bottom, so each folding wheel can gradually squeeze the plastic bag from shallow to deep, thereby avoiding the deformation of the plastic bag caused by the large squeezing depth, which affects the processing yield.

[0016] The movable plate can move along the axial direction of the first guide roller and the second guide roller, thereby changing the position of the folding wheel; the distance between the first guide roller and the second guide roller is adjustable; thus, it can be used to process plastic bags of different specifications. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the inner structure of the support frame of this utility model;

[0019] Figure 3 This is a schematic diagram of the outer structure of the support frame of this utility model;

[0020] Figure 4 This is a schematic diagram of the movable plate structure of this utility model.

[0021] Figure label:

[0022] 1. Support frame; 2. First mounting plate; 3. Second mounting plate; 4. First guide rod; 5. Second guide rod; 6. Movable plate; 7. Rotating frame; 8. Folding wheel; 9. Drive screw; 10. Guide slide rod; 11. First grip; 12. First rotating shaft; 13. Second rotating shaft; 14. Gear; 15. Worm gear; 16. Worm; 17. Second grip; 18. Mounting frame. Detailed Implementation

[0023] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "page", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, 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, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "equipped with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Example

[0027] See attached document Figure 1-4 A folding device for plastic bag production includes symmetrically distributed support frames 1. Each of the two support frames 1 has a first mounting plate 2 and a second mounting plate 3 on its opposite sides. The gap between the first mounting plate 2 and the second mounting plate 3 gradually decreases from top to bottom. Multiple first guide rollers 4 are rotatably mounted between the two first mounting plates 2, and multiple second guide rollers 5 are rotatably mounted between the two second mounting plates 3. The first guide rollers 4 are linearly and uniformly distributed along the length direction of the first mounting plate 2, and the second guide rollers 5 are linearly and uniformly distributed along the length direction of the second mounting plate 3. A movable plate 6 is mounted on one of the support frames 1. The movable plate 6 is located between the first mounting plate 2 and the second mounting plate 3 of the support frame 1 and can be driven to move axially along the first guide rollers 4 and the second guide rollers 5. A plurality of vertically equidistant rotating frames 7 are fixed on the side of the movable plate 6 away from the support frame 1. The length of the rotating frames 7 gradually increases from top to bottom, and each rotating frame 7 is equipped with a folding wheel 8 at its end.

[0028] In this embodiment, the plastic bag being processed is conveyed from the bottom of the support frame 1 to the top via a conveying mechanism. During the conveying process, the gap between several first guide rollers 4 and second guide rollers 5 gradually decreases from top to bottom. Therefore, the front and back sides of the plastic bag are squeezed to form a plastic bag body that is wider at the bottom and narrower at the top. The left and right sides of the plastic bag are squeezed by the folding wheels 8 to form an "M" shaped accordion edge. Since the length of the rotating frame 7 gradually increases from top to bottom, each folding wheel 8 can gradually squeeze the plastic bag from shallow to deep, thereby avoiding the plastic bag from deforming due to a large compression depth, which would affect the processing yield.

[0029] The movable plate 6 is threaded with a drive screw 9 and a guide slide rod 10 is fixedly installed. The drive screw 9 and the guide slide rod 10 both extend along the axial direction of the first guide rod 4 and the second guide rod 5, and are rotatably connected to the corresponding support frame 1 and slidably connected to it, respectively. The end of the drive screw 9 is equipped with a first grip 11, and it and the guide slide rod 10 are symmetrically distributed on the movable plate 6.

[0030] In this embodiment, after the first handle 11 is rotated, the drive screw 9 rotates synchronously. In conjunction with the sliding of the guide slide rod 10 and the support frame 1, the movable plate 6 can be driven to move along the axial direction of the first guide rod 4 and the second guide rod 5 between the first mounting plate 2 and the second mounting plate 3, thereby changing the position of the folding wheel 8 for processing folds of different depths on plastic bags.

[0031] The first mounting plate 2 and the second mounting plate 3 are rotatably connected to the corresponding support frame 1 via the first rotating shaft 12 and the second rotating shaft 13, respectively. The first rotating shaft 12 and the second rotating shaft 13 located on the same side are mutually meshed and driven by their respective fixed gears 14. A worm gear 15 is fixed on one of the first rotating shaft 12 or the second rotating shaft 13. The worm gear 15 meshes and drives a worm 16. One end of the worm 16 is equipped with a second handle 17 and is rotatably connected to the mounting bracket 18 provided on the corresponding support frame 1.

[0032] In this embodiment, after the second handle 17 is rotated, the worm gear 16 rotates synchronously, which drives the corresponding second rotating shaft 13 to rotate through the meshing transmission with the worm wheel 15. Then, the first rotating shaft 12 is driven to rotate through the meshing transmission of the two gears 14. As a result, the first mounting plate 2 and the second mounting plate 3 can rotate synchronously in opposite directions, thereby adjusting the distance between the first guide rod 4 and the second guide rod 5 for processing plastic bags of different specifications.

[0033] The above-described embodiments are merely illustrative of certain implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[0034] It should be noted that the above content falls within the scope of the inventor's technical knowledge. Due to the vast and complex nature of the technical content in this field, the above content of this application does not necessarily constitute prior art.

Claims

1. A folding device for producing plastic bags, characterized in that: The system includes symmetrically distributed support frames (1), with a first mounting plate (2) and a second mounting plate (3) respectively provided on opposite sides of the two support frames (1). The gap between the first mounting plate (2) and the second mounting plate (3) gradually decreases from top to bottom. Multiple first guide rods (4) are rotatably installed between the two first mounting plates (2), and multiple second guide rods (5) are rotatably installed between the two second mounting plates (3). The first guide rods (4) are linearly and uniformly distributed along the length direction of the first mounting plate (2), and the second guide rods (5) are linearly and uniformly distributed along the length direction of the second mounting plate (3). One of the support frames (1) is equipped with a movable plate (6), which is located between the first mounting plate (2) and the second mounting plate (3) of the support frame (1) and can be driven to move along the axial direction of the first guide rod (4) and the second guide rod (5). Several vertically equidistant rotating frames (7) are fixed on the side of the movable plate (6) away from the support frame (1). The length of the rotating frames (7) gradually increases from top to bottom, and each rotating frame (7) is equipped with a folding wheel (8) at its end.

2. The folding device for plastic bag production according to claim 1, characterized in that: The movable plate (6) is threaded with a drive screw (9) and a guide slide rod (10) is fixedly installed. The drive screw (9) and the guide slide rod (10) both extend along the axial direction of the first guide rod (4) and the second guide rod (5), and are rotatably connected and slidably connected to the corresponding support frame (1), respectively.

3. The folding device for plastic bag production according to claim 2, characterized in that: The drive screw (9) is equipped with a first grip (11) at its end, and is symmetrically distributed on the movable plate (6) along with the guide slide (10).

4. The folding device for plastic bag production according to claim 1, characterized in that: The first mounting plate (2) and the second mounting plate (3) are rotatably connected to the corresponding support frame (1) via the first rotating shaft (12) and the second rotating shaft (13), respectively. The first rotating shaft (12) and the second rotating shaft (13) located on the same side are driven by their respective fixed gears (14).

5. A folding device for producing plastic bags according to claim 4, characterized in that: A worm gear (15) is fixed on one of the first rotating shafts (12) or the second rotating shaft (13). The worm gear (15) meshes with a worm (16). One end of the worm (16) is equipped with a second handle (17) and is rotatably connected to the mounting bracket (18) provided on the corresponding support frame (1).

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