A film dynamic tension control mechanism

Abstract

The utility model discloses a kind of film dynamic tension control mechanisms, suitable for the film conveying device of box-type packing machine, including mounting plate, resistance wheel, eccentric wheel, resistance belt, floating axle, swing arm, connecting rod one, connecting rod two and baffle shaft. Resistance wheel is connected with film reel through connecting rod two, eccentric wheel is connected with swing arm and floating axle through connecting rod one, resistance belt connects resistance wheel and eccentric wheel, and is fixed on mounting plate through fixed frame. Film is output from film reel, in turn bypasses first fixed shaft, floating axle and second fixed shaft, and baffle shaft ensures that conveying path is stable. When working, floating axle moves up and down under the tension of film, drives eccentric wheel to deflect, and the resistance of resistance wheel to film reel is dynamically adjusted through resistance belt, to control the release amount of film. The mechanism does not need screw or spring adjustment, and the structure is simple, easy to maintain, can keep film tension stable in real time, avoid film breakage or uneven cover film problem, significantly improve packaging quality and efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of box packaging machines, and in particular to a film dynamic tension control mechanism. Background Technology

[0002] In the field of box packaging machine technology, the film conveying device, as one of the core components, is responsible for ensuring the smooth transport and precise sealing of the film during the packaging process. Its performance directly affects packaging quality and production efficiency. With the rapid development of the packaging industry, especially the increasing demand for high-efficiency and high-quality packaging in industries such as food, pharmaceuticals, and daily chemicals, the technology of film conveying devices has been significantly improved. Early devices mainly achieved film transport and tension control through simple mechanical structures, such as fixed guide rollers and manual tension adjustment mechanisms. With the introduction of automation technology, modern packaging machines have begun to adopt more complex tension adjustment systems, such as spring-based semi-automatic devices or automatic control systems equipped with sensors. These technological advancements have significantly improved the stability of film transport, reduced the frequency of manual operation, and adapted to the needs of high-speed packaging to some extent. In addition, some high-end equipment has achieved more precise tension adjustment by integrating servo motors and electronic control modules, meeting the requirements of diverse film materials and complex packaging scenarios. However, the application of these technologies is still limited to specific scenarios and has not fully met the needs of small and medium-sized packaging equipment for cost and ease of maintenance.

[0003] Despite advancements in film tension control technology, traditional film conveying devices still suffer from significant shortcomings in dynamic tension adjustment. Taking traditional tension adjustment mechanisms based on springs or adjusting screws as an example, their main drawback lies in their inability to respond in real-time to dynamic changes in film tension during packaging. During high-speed packaging or changes in film material, fixed or semi-fixed tension settings cannot quickly adapt to tension fluctuations, leading to unstable film tension and subsequently problems such as film breakage, film wrinkling, or incomplete sealing. This deficiency not only reduces packaging quality but also increases defect rates and production costs. Furthermore, the complex mechanical structure of traditional devices, such as multiple sets of guide rollers and spring assemblies, increases manufacturing and maintenance costs. Maintenance requires frequent adjustments or replacements of parts, extending equipment downtime. In recent years, although some automatic tension adjustment devices have improved dynamic response capabilities through sensors and control systems, their high cost and maintenance complexity make them difficult to promote in small and medium-sized packaging equipment. Therefore, there is an urgent need for a film conveying device with a simple structure, capable of dynamic tension adjustment and convenient maintenance, to ensure packaging quality while reducing production and maintenance costs and meeting the diverse needs of the modern packaging industry. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] In view of the following technical problems existing in the prior art, the present invention provides a film dynamic tension control mechanism, characterized in that it includes a mounting plate, a resistance wheel, an eccentric wheel, a resistance belt and a floating shaft, wherein the resistance wheel and the eccentric wheel are rotatably disposed on the mounting plate, the resistance wheel is connected to the eccentric wheel through the resistance belt, the resistance belt is fixedly connected to the mounting plate, and the eccentric wheel is connected to the floating shaft.

[0006] As a preferred technical solution for a film dynamic tension control mechanism, the eccentric wheel is connected to the swing arm via a connecting rod, and the swing arm is connected to the floating shaft.

[0007] As a preferred technical solution for a film dynamic tension control mechanism, a connecting cylinder is provided on the mounting plate, and the connecting rod passes through the connecting cylinder and is mounted on the mounting plate.

[0008] As a preferred technical solution for a film dynamic tension control mechanism, the resistance wheel is connected to the film roll shaft via a connecting rod 2.

[0009] As a preferred technical solution for a film dynamic tension control mechanism, a second connecting cylinder is provided on the mounting plate, and the second connecting rod passes through the second connecting cylinder and is mounted on the mounting plate.

[0010] As a preferred technical solution for a film dynamic tension control mechanism, the mounting plate is provided with a film roll, a first fixed shaft, a floating shaft and a second fixed shaft in sequence along the film transport direction.

[0011] As a preferred technical solution for a film dynamic tension control mechanism, the resistance band is fixedly connected to the mounting plate via a fixing frame.

[0012] As a preferred technical solution for a film dynamic tension control mechanism, the mounting plate is equipped with a stop shaft.

[0013] The beneficial effects of this invention are as follows: This mechanism, through the linkage design of a floating shaft, eccentric wheel, and resistance band, achieves dynamic and automatic adjustment of film tension, eliminating the need for traditional adjusting screws or springs and simplifying operation and maintenance. Its compact structure and simple component design reduce manufacturing and subsequent maintenance costs. During film conveying, the rational layout of the stop shaft and fixed shaft ensures the stability of the conveying path, effectively preventing film deviation or entanglement. The dynamic tension control mechanism can respond to changes in external tension in real time, maintaining film tension within a reasonable range and avoiding problems such as film breakage or uneven film covering caused by improper tension. This improves the packaging quality and production efficiency of the box packaging machine, making it particularly suitable for automated packaging scenarios with high requirements for film tension. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0015] Figure 1 This is a schematic diagram of the overall structure of the device of this utility model. Figure 1 ;

[0016] Figure 2 This is a schematic diagram of the overall structure of the device of this utility model. Figure 2 ;

[0017] Figure 3 This is a schematic diagram of the overall structure of the device of this utility model. Figure 3 ;

[0018] Reference numerals: 11. Mounting plate; 12. Resistance wheel; 13. Eccentric wheel; 14. Resistance band; 15. Floating shaft; 16. Connecting rod one; 17. Swing arm; 18. Connecting cylinder one; 19. Connecting rod two; 20. Connecting cylinder two; 21. Membrane roll; 22. First fixed shaft; 23. Second fixed shaft; 24. Fixing frame; 25. Stop shaft. Detailed Implementation

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0022] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0023] Please refer to Figures 1 to 3 As shown, this utility model provides a film dynamic tension control mechanism, including a mounting plate 11, a resistance wheel 12, an eccentric wheel 13, a resistance belt 14, and a floating shaft 15. The resistance wheel 12 and the eccentric wheel 13 are rotatably mounted on the mounting plate 11. The resistance wheel 12 is connected to the eccentric wheel 13 through the resistance belt 14. The resistance belt 14 is fixedly connected to the mounting plate 11 through a fixing frame 24. The eccentric wheel 13 is connected to the floating shaft 15.

[0024] It should be noted that this mechanism utilizes the up-and-down movement of the floating shaft 15, which drives the eccentric wheel 13 to deflect when the film is pulled by an external force during transport. This causes the resistance belt 14 to tighten and contract, and the resistance of the resistance wheel 12 is adjusted by the resistance belt 14, thereby dynamically controlling the amount of film released from the film roll. Compared with traditional mechanisms, this design requires no screws or springs for adjustment, has a simple structure, is easy to maintain, and can effectively maintain stable film tension, avoiding problems such as film breakage or uneven film covering.

[0025] The eccentric wheel 13 is connected to the swing arm 17 via a connecting rod 16, and the swing arm 17 is connected to the floating shaft 15. A connecting cylinder 18 is provided on the mounting plate 11, and the connecting rod 16 passes through the connecting cylinder 18 into the mounting plate 11.

[0026] It should be noted that the eccentric wheel 13 is connected to the swing arm 17 via a connecting rod 16, and the swing arm 17 is further connected to the floating shaft 15. The connecting rod 16 passes through the connecting cylinder 18 on the mounting plate 11 to ensure the stability and guidance of the movement. When the diaphragm is pulled by an external force, the floating shaft 15 moves up and down under the action of the tension, causing the swing arm 17 to swing, which in turn causes the eccentric wheel 13 to deflect via the connecting rod 16.

[0027] The resistance wheel 12 is connected to the membrane roll 21 via a connecting rod 2 19. A connecting cylinder 20 is provided on the mounting plate 11, and the connecting rod 2 19 passes through the connecting cylinder 20 into the mounting plate 11.

[0028] It should be noted that this design allows the resistance wheel 12 to act directly on the membrane roll 21 through the connecting rod 2 19, and combined with the tension adjustment of the resistance wheel 12 by the resistance belt 14, the amount of film released from the membrane roll can be dynamically controlled.

[0029] The mounting plate 11 is provided with a film roll 21, a first fixed shaft 22, a floating shaft 15 and a second fixed shaft 23 in sequence along the transport direction of the film.

[0030] It should be noted that the mounting plate 11 is sequentially arranged with a film roll 21, a first fixed shaft 22, a floating shaft 15, and a second fixed shaft 23 along the film transport direction, forming an orderly film transport path. The film is output from the film roll 21, passes above the first fixed shaft 22 and below the floating shaft 15, and then winds around to the top of the second fixed shaft 23. The tension is dynamically adjusted by the up-and-down movement of the floating shaft 15. The film roll 21 is responsible for releasing the film, the first fixed shaft 22 and the second fixed shaft 23 provide stable guidance and support, and the floating shaft 15 drives the eccentric wheel 13 and the resistance belt 14 through its displacement, adjusting the resistance of the resistance wheel 12 on the film roll 21, thereby controlling the amount of film released.

[0031] The mounting plate 11 is provided with a baffle 25, which can constrain the rising position of the floating shaft 15, thereby helping to guide and constrain the movement trajectory of the film during the conveying process.

[0032] The working principle of this utility model:

[0033] The film is output from the film roll 21 and travels along the conveying path on the mounting plate 11, passing above the first fixed shaft 22, below the floating shaft 15, and then above the second fixed shaft 23. The stop shaft 25 on the mounting plate 11 helps constrain the film's trajectory to prevent deviation. When the film is subjected to external tension, the floating shaft 15 moves upward under the tension, causing the eccentric wheel 13 to deflect at an angle via the swing arm 17 and connecting rod 16 connected to it. The deflection of the eccentric wheel 13 loosens the resistance band 14, reducing the tension of the resistance band 14 on the resistance wheel 12. The resistance wheel 12 is connected to the film roll 21 via connecting rod 19, thereby reducing the rotational resistance of the film roll 21 and allowing the film roll 21 to rotate smoothly to release the film. When the external tension decreases or disappears, the floating shaft 15 descends under its own weight or film tension, driving the swing arm 17 and connecting rod 16 to deflect the eccentric wheel 13 in the opposite direction, tightening the resistance band 14, increasing the tension on the resistance wheel 12, and then increasing the rotational resistance of the film roll 21 through the connecting rod 19, slowing down or stopping the rotation of the film roll 21, and controlling the amount of film released. This dynamic adjustment mechanism does not require adjusting screws or springs, and automatically adapts to tension changes by relying on the displacement of the floating shaft 15 and the deflection of the eccentric wheel 13. It has a simple structure, low manufacturing and maintenance costs, and can maintain the film tension within the design range in real time, effectively solving problems such as film breakage and uneven film covering caused by improper tension, and significantly improving the stability and reliability of film conveying in box packaging machines.

[0034] The embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A film dynamic tension control mechanism, characterized in that, The system includes a mounting plate (11), a resistance wheel (12), an eccentric wheel (13), a resistance band (14), and a floating shaft (15). The resistance wheel (12) and the eccentric wheel (13) are rotatably mounted on the mounting plate (11). The resistance wheel (12) is connected to the eccentric wheel (13) through the resistance band (14). The resistance band (14) is fixedly connected to the mounting plate (11). The eccentric wheel (13) is connected to the floating shaft (15).

2. The film dynamic tension control mechanism according to claim 1, characterized in that, The eccentric wheel (13) is connected to the swing arm (17) via a connecting rod (16), and the swing arm (17) is connected to the floating shaft (15).

3. The film dynamic tension control mechanism according to claim 2, characterized in that, A connecting cylinder (18) is provided on the mounting plate (11), and the connecting rod (16) passes through the connecting cylinder (18) and is mounted on the mounting plate (11).

4. The film dynamic tension control mechanism according to claim 1, characterized in that, The resistance wheel (12) is connected to the membrane roll (21) via connecting rod two (19).

5. The film dynamic tension control mechanism according to claim 4, characterized in that, The mounting plate (11) is provided with a connecting cylinder two (20), and the connecting rod two (19) passes through the connecting cylinder two (20) and is mounted on the mounting plate (11).

6. The film dynamic tension control mechanism according to claim 1, characterized in that, The mounting plate (11) is provided with a film roll (21), a first fixed shaft (22), a floating shaft (15) and a second fixed shaft (23) in sequence along the film transport direction.

7. The film dynamic tension control mechanism according to claim 1, characterized in that, The resistance band (14) is fixedly connected to the mounting plate (11) by a fixing bracket (24).

8. The film dynamic tension control mechanism according to claim 1, characterized in that, A stop shaft (25) is provided on the mounting plate (11).

Images