Tension adjusting structure of unwinding equipment of vest bag making machine

Abstract

The utility model discloses a tension adjusting structure of unwinding equipment of a vest bag making machine, and belongs to the technical field of unwinding equipment. The unwinding device comprises a bottom plate and an unwinding shaft, fixing plates are installed on the two sides of the top of the bottom plate, the two ends of the unwinding shaft are connected to the tops of the two fixing plates, a rotating shaft is installed at the end of the unwinding shaft, tension adjusting mechanisms are arranged on the fixing plates, reserved grooves are formed in the tops of the fixing plates, and positioning plates are arranged in the reserved grooves in a sliding fit mode. Film materials are prevented from being wrinkled through the arc-shaped block and the positioning plate, when the arc-shaped plate moves downwards to the position above the end of the unwinding shaft, uniform contact pressure is formed between the arc face of the arc-shaped plate and the film, the warping trend of the edge of the film is forcibly flattened, and the film unwinding device is particularly suitable for ultra-thin or high-elasticity materials; the contact area can be optimized in real time according to the width, thickness and unwinding speed of the film, the transverse stress difference is counteracted, and local excessive stretching or relaxation is avoided.

Description

Technical Field

[0001] This utility model relates to the field of unwinding equipment technology, specifically a tension adjustment structure for unwinding equipment of a vest bag making machine. Background Technology

[0002] The unwinding equipment of a vest bag making machine is a key device in the field of plastic film processing. Its function is to smoothly unwind the rolled film material and transport it to the bag-making station. During the unwinding process, the stability of the film tension directly affects the flatness and pass rate of the bag products. Existing technologies generally use mechanical brakes or magnetic powder brakes to adjust the unwinding tension, such as using a worm gear mechanism to drive the brake pads to rub against the rotating shaft to control the rotation speed. However, such structures can only solve the problem of tension fluctuations and cannot cope with defects such as local warping and wrinkles caused by film inertia or material properties, especially when unwinding at high speed or processing thin films.

[0003] In the prior art, such as the unwinding device of a bag making machine disclosed in a Chinese authorized patent (publication number: CN202420750197.X), although the brake pads achieve linear pressure adjustment of the rotating shaft through the worm gear-worm-gear transmission system, when the film material is conveyed on the unwinding shaft, due to the characteristics of the material itself or the influence of factors in the unwinding process, edge curling and wrinkles are prone to occur, which affects the quality of bag making. It does not address the problem of uneven lateral stress in the unwinding process of film, and wrinkles or curling edges are easily generated due to the loosening of film edges or local tension imbalance. Utility Model Content

[0004] The purpose of this utility model is to provide a tension adjustment structure for the unwinding equipment of a vest bag making machine. By setting an arc-shaped block and a positioning plate to prevent wrinkles in the film material, the problem of edge curling during film conveying is solved.

[0005] This utility model is achieved through the following technical solution:

[0006] This utility model relates to a tension adjustment structure for the unwinding device of a vest bag making machine, comprising a base plate and an unwinding shaft. Fixed plates are installed on both sides of the top of the base plate. The two ends of the unwinding shaft are connected to the tops of the two fixed plates. A rotating shaft is installed at the end of the unwinding shaft. A tension adjustment mechanism is provided on the fixed plates. A pre-reserved groove is provided on the top of the fixed plates, and a positioning plate is slidably fitted within the groove. A rectangular frame is installed at the top of the fixed plates, and a screw is installed within the rectangular frame. A threaded hole for the screw is provided on the positioning plate, and an arc-shaped block is provided at the end of the positioning plate, located at the end of the unwinding shaft.

[0007] Furthermore, a first convex block is installed on both sides of the positioning plate, and a first convex groove that matches the first convex block is opened in the rectangular frame.

[0008] Furthermore, a second convex block is installed on the top of the arc-shaped block, and a second convex groove that matches the second convex block is opened on the bottom of the positioning plate.

[0009] Furthermore, a positioning groove is provided inside the second convex block, and a through groove is provided on the positioning plate. A positioning block is fitted inside the through groove, and the bottom end of the positioning block fits into the positioning groove.

[0010] Furthermore, damping pads are provided on both sides of the positioning block, and the two damping pads are in contact with the inner wall of the through groove.

[0011] Furthermore, the tension adjustment mechanism has a movable plate, a movable block, and a brake pad, with the movable block mounted on top of the movable plate and the brake pad mounted on top of the movable block.

[0012] This utility model has the following beneficial effects:

[0013] This invention prevents wrinkles in film materials by using an arc-shaped block and a positioning plate. When the arc-shaped plate moves down to the top of the unwinding shaft, its arc surface forms a uniform contact pressure with the film, forcibly flattening the warping tendency of the film edge. It is especially suitable for ultra-thin or highly elastic materials. The height of the arc-shaped plate is adjustable, which can optimize the contact area in real time according to the film width, thickness and unwinding speed, offset the difference in lateral stress and avoid local overstretching or loosening.

[0014] This invention allows for the assembly and disassembly of the arc-shaped block via a first convex block and a positioning block. The detachable arc-shaped plate allows users to replace it with arc-shaped plates of different curvatures, hardnesses, or surface materials according to specific production needs to enhance the flattening effect. Meanwhile, during long-term production, the film may attract dust or residual plastic particles due to static electricity, causing contamination of the arc-shaped plate contact surface. The quick-disassembly design facilitates regular cleaning or replacement of worn parts, avoiding the impact of dirt accumulation on the film surface quality and reducing downtime.

[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the unwinding roller and the fixing plate;

[0017] Figure 2 This is a structural diagram of the rectangular frame and the positioning plate;

[0018] Figure 3 This is a structural diagram of the positioning plate and the arc block;

[0019] Figure 4 This is a schematic diagram of the positioning plate and the second convex block.

[0020] In the diagram: 1. Base plate; 2. Fixing plate; 201. Reserved groove; 202. Moving plate; 203. Moving block; 204. Brake pad; 3. Unwinding shaft; 4. Positioning plate; 401. Threaded hole; 402. First convex block; 403. Second convex groove; 404. Through groove; 5. Rectangular frame; 501. First convex groove; 6. Screw; 7. Arc block; 8. Second convex block; 801. Positioning groove; 9. Positioning block; 10. Damping pad. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 This utility model provides a technical solution: a tension adjustment structure for the unwinding device of a vest bag making machine, including a base plate 1 and an unwinding shaft 3. The base plate 1 is also provided with the bag making machine body (not shown in the figure). Fixed plates 2 are installed on both sides of the top of the base plate 1. The two ends of the unwinding shaft 3 are connected to the top of the two fixed plates 2. A rotating shaft 301 is installed at the end of the unwinding shaft 3. A tension adjustment mechanism is provided on the fixed plates 2. The tension adjustment mechanism has a moving plate 202, a moving block 203, and a brake pad 204. The moving block 203 is installed on the top of the moving plate 202, and the brake pad 204 is installed on the top of the moving block 203. The tension adjustment mechanism and the bag making machine body are existing technologies and will not be discussed in detail here. To elaborate further, a reserved groove 201 is provided on the top of the fixed plate 2, and a positioning plate 4 is slidably fitted in the reserved groove 201. A first convex block 402 is installed on both sides of the positioning plate 4. A first convex groove 501 that matches the first convex block 402 is provided in the rectangular frame 5. By setting the first convex block 402, when the positioning plate 4 slides, the two first convex blocks 402 slide in the corresponding first convex groove 501 respectively, ensuring that the movement of the positioning plate 4 will not be offset. A rectangular frame 5 is installed on the top of the fixed plate 2, and a screw 6 is provided in the rectangular frame 5. A threaded hole 401 that matches the screw 6 is provided on the positioning plate 4. An arc-shaped block 7 is provided at the end of the positioning plate 4, and the arc-shaped block 7 is located at the end of the unwinding shaft 3.

[0023] When unwinding the film in the vest bag making machine, the drive source is activated to rotate the screw 6 according to the film thickness. Since the two first convex blocks 402 slide in the corresponding first convex grooves 501 to limit the movement of the positioning plate 4, the screw 6 can drive the positioning plate 4 to move vertically to the bottom along the reserved groove 201 when rotating, and drive the arc block 7 to move until the arc block 7 is located at the top of the film. At this time, when the unwinding shaft 3 unwinds the film, the arc block 7 limits the edges of the film at both ends of the unwinding shaft 3 to prevent it from wrinkling and curling.

[0024] A second convex block 8 is installed on the top of the arc-shaped block 7. A second convex groove 403 that matches the second convex block 8 is opened at the bottom of the positioning plate 4. A positioning groove 801 is opened inside the second convex block 8. A through groove 404 is opened on the positioning plate 4. A positioning block 9 is fitted inside the through groove 404. The bottom end of the positioning block 9 fits inside the positioning groove 801. Damping pads 10 are provided on both sides of the positioning block 9. The damping pads 10 are made of rubber to increase the friction between the positioning block 9 and the through groove 404. The two damping pads 10 are in contact with the inner wall of the through groove 404.

[0025] When it is necessary to disassemble the arc block 7, pull the positioning block 9 upwards so that the positioning block 9 slides along the through groove 404 until the end of the positioning block 9 moves out of the positioning groove 801. Then slide the arc block 7 laterally so that the second convex block 8 moves out of the second convex groove 403. The arc block 7 can then be disassembled. When installing, slide the second convex block 8 into the second convex groove 403, and then move the positioning block 9 to the bottom so that the end of the positioning block 9 fits into the positioning groove 801 to limit the second convex block 8. At this time, the damping pad 10 is used to prevent the positioning block 9 from sliding to the top, and the installation of the arc block 7 can be completed.

[0026] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A tension adjustment structure for the unwinding device of a vest bag making machine, comprising a base plate (1) and an unwinding shaft (3), characterized in that: The bottom plate (1) has two fixing plates (2) installed on both sides of the top. The two ends of the unwinding shaft (3) are connected to the top of the two fixing plates (2). The end of the unwinding shaft (3) is equipped with a rotating shaft (301). The fixing plate (2) is provided with a tension adjustment mechanism. The top of the fixing plate (2) is provided with a reserved groove (201), and a positioning plate (4) is slidably fitted in the reserved groove (201). A rectangular frame (5) is installed at the top of the fixing plate (2), and a screw (6) is provided in the rectangular frame (5). A threaded hole (401) for the screw (6) is provided on the positioning plate (4). An arc-shaped block (7) is provided at the end of the positioning plate (4), and the arc-shaped block (7) is located at the end of the unwinding shaft (3).

2. The tension adjustment structure of the unwinding device of a vest bag making machine according to claim 1, characterized in that, The positioning plate (4) is equipped with a first convex block (402) on both sides, and the rectangular frame (5) is provided with a first convex groove (501) that matches the first convex block (402).

3. The tension adjustment structure of the unwinding device of a vest bag making machine according to claim 1, characterized in that, The top of the arc-shaped block (7) is equipped with a second convex block (8), and the bottom of the positioning plate (4) is provided with a second convex groove (403) that matches the second convex block (8).

4. The tension adjustment structure of the unwinding device of a vest bag making machine according to claim 3, characterized in that, The second convex block (8) has a positioning groove (801) and the positioning plate (4) has a through groove (404). A positioning block (9) is fitted in the through groove (404) and the bottom end of the positioning block (9) fits in the positioning groove (801).

5. The tension adjustment structure of the unwinding device of a vest bag making machine according to claim 4, characterized in that, Damping pads (10) are provided on both sides of the positioning block (9), and the two damping pads (10) are in contact with the inner wall of the through groove (404).

6. The tension adjustment structure of the unwinding device of a vest bag making machine according to claim 1, characterized in that, The tension adjustment mechanism has a movable plate (202), a movable block (203) and a brake pad (204). The movable block (203) is mounted on the top of the movable plate (202), and the brake pad (204) is mounted on the top of the movable block (203).

Images