A sealing mechanism for a film bag making machine

Abstract

This utility model discloses a sealing mechanism for a film bag making machine, including a film conveying device and a sealing device. The sealing device includes an upper sealing knife and a lower sealing knife that move relative to each other. The film conveying device includes a front traction component, a rear traction component, and a moving component. The moving component is disposed between the front traction component and the rear traction component. The moving component includes a moving frame that moves back and forth and front guide rollers and rear guide rollers mounted on the moving frame. At least two sets of front guide rollers and rear guide rollers are provided. The sealing device operates between the first front guide roller and the last rear guide roller. A front transition roller is provided between adjacent front guide rollers, and a rear transition roller is provided between adjacent rear guide rollers. Both the front transition rollers and the rear transition rollers are mounted on the machine frame. The front traction component and the rear traction component of this utility model continuously traction the film, while the moving component keeps the film stationary during the sealing operation, which ensures both production efficiency and a firm film seal.

Description

Technical Field

[0001] This utility model relates to the field of film bag making machines, specifically a sealing mechanism for a film bag making machine. Background Technology

[0002] The sealing mechanism of a film bag making machine is used for side and bottom sealing of the film. The sealing time required varies depending on the thickness of the film; the thicker the film, the longer the sealing time. Insufficient sealing time will result in insufficient film sealing strength and incomplete adhesion. Therefore, existing film bag making machines can only use intermittent conveying, leading to low production efficiency. Utility Model Content

[0003] In view of the technical problems existing in the background art, the technical problem to be solved by this utility model is to provide a sealing mechanism for a film bag making machine with high production efficiency and strong sealing.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: the sealing mechanism of the film bag making machine is characterized by including a film conveying device and a sealing device; The sealing device includes an upper sealing blade and a lower sealing blade that move in relative vertical motion; The film conveying device includes a front traction component, a rear traction component, and a moving component. The moving component is disposed between the front traction component and the rear traction component. The front traction component and the rear traction component continuously traction at the same speed. - The moving component includes a moving frame that moves back and forth on the frame and front guide rollers and rear guide rollers mounted on the moving frame. There are at least two sets of front guide rollers and rear guide rollers. The sealing device operates between the first front guide roller and the last rear guide roller. A front transition roller is provided between adjacent front guide rollers and a rear transition roller is provided between adjacent rear guide rollers. Both the front transition rollers and the rear transition rollers are mounted on the frame.

[0005] This invention features a front and rear traction component that continuously pulls the film, while a moving component keeps the film stationary during the sealing process. Because at least two sets of front and rear guide rollers are provided, a sufficient amount of film can be supplied, allowing ample time for the sealing operation. Furthermore, the moving frame can provide or consume the required film length through a relatively slow movement speed, resulting in low inertia and excellent stability. Compared to existing technologies, this invention ensures both production efficiency and a secure film seal.

[0006] Preferably, when the upper sealing knife and the lower sealing knife are pressing together, the moving frame moves in the opposite direction to the film conveying direction, and the upper sealing knife and the lower sealing knife remain stationary relative to the film they are pressing together. The upper and lower sealing blades separate, and the movable frame resets. The movable frame moves, that is, the front guide roller and the front transition roller move in the opposite direction to the film conveying direction, providing the required length of film to the front traction component; at the same time, the movement of the rear guide roller and the rear transition roller consumes the length of film pulled forward by the rear traction component, so that the film at the sealing point remains stationary.

[0007] Preferably, the sealing device is provided in two sets: a front sealing device and a rear sealing device, which are longitudinally distributed. The arrangement of two sets of sealing devices allows for the sealing of two parts or two bags in a single sealing operation. This further reduces the moving speed of the moving frame during resetting. Simultaneously, since the moving speed of the moving frame is relatively slower than the speed at which the traction component pulls the film, the moving speed of the moving frame and the linear speed at which the traction component pulls the film can be increased, further improving the production efficiency of the bag-making machine.

[0008] Preferably, the front sealing device and the rear sealing device are fixed in their longitudinal positions on the frame, and a lifting roller for adjusting the film length between them is provided. When the length of the bag changes, the film length between the front sealing device and the rear sealing device is adjusted accordingly by adjusting the height of the lifting roller.

[0009] Preferably, the longitudinal position of the front sealing device on the frame is fixed, while the rear sealing device can move longitudinally relative to the front sealing device to adjust the distance between them. When the length of the bag changes, the distance between the rear sealing device and the front sealing device is adjusted by moving the rear sealing device, so that the film length between them is adapted to the bag length.

[0010] Preferably, the first guide roller and the last guide roller are at the same height. The film wound on both rollers is horizontal, making the sealing operation more stable. Attached Figure Description

[0011] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model.

[0012] Figure 2 This is a structural schematic diagram of Embodiment 2 of the present invention.

[0013] Figure 3 This is a structural schematic diagram of Embodiment 3 of the present invention.

[0014] Reference numerals: 1. Film; 2. Rear traction component; 3. Front traction component; 4. Rear guide roller; 41. First rear roller; 42. Second rear roller; 43. Rear transition roller; 5. Front guide roller; 51. First front roller; 52. Second front roller; 53. Front transition roller; 6. Moving frame; 7. Sealing device; 71. Front sealing device; 72. Rear sealing device; 8. Lifting roller. Detailed Implementation

[0015] The following describes the embodiments and related details and working principles of this utility model with reference to the accompanying drawings. The sealing mechanism of this film bag making machine includes a film conveying device and a sealing device 7; the sealing device 7 includes an upper sealing knife and a lower sealing knife that move relative to each other. Typically, the lower sealing knife remains stationary while the upper sealing knife moves up and down; alternatively, both the upper and lower sealing knives can move up and down. The upper sealing knife can seal only the sides or bottom of the film. The upper sealing knife also includes a point-cut sealing knife, which performs point-cutting and side- or bottom-sealing on the film. The bag can be torn off the roll by tearing at the point-cut.

[0016] The film conveying device includes a front traction component 3, a rear traction component 2, and a moving component. The moving component is positioned between the front traction component 3 and the rear traction component 2. The front traction component 3 and the rear traction component 2 continuously pull at the same speed. The front traction component and the rear traction component can be traction rollers that press against each other. The moving component includes a moving frame 6 that moves back and forth on the frame, and front guide rollers 5 and rear guide rollers 4 mounted on the moving frame. To ensure stable movement of the moving frame 6, a linear guide rail is provided on the frame, and a slide is provided on the linear guide rail. The slide is mounted on the moving frame, and the moving frame 6 moves stably back and forth along the linear guide rail. At least two sets of front guide rollers 5 and rear guide rollers 4 are provided. The sealing device 7 operates between the first front guide roller and the last rear guide roller. A front transition roller 53 is provided between adjacent front guide rollers 5, and a rear transition roller 43 is provided between adjacent rear guide rollers. Both the front transition rollers and the rear transition rollers are mounted on the frame. The first front guide roller and the last rear guide roller are at the same height, and the film wound around them is in a horizontal state. The figure shows that there are two front guide rollers 5 and two rear guide rollers 4, namely the first front roller 51, the second front roller 52, the first rear roller 41 and the second rear roller 42. There is one front transition roller 53 and one rear transition roller 43 between the two front guide rollers and between the two rear guide rollers. The film passes through the rear traction component 2, the first rear roller 41, the transition roller, the second rear roller 42, the first front roller 51, the front transition roller 53, the second front roller 52 and the front traction component 3 in sequence. The first front guide roller and the last rear guide roller are the first front roller 51 and the second rear roller 42. Because there are two guide rollers (front and rear), the film length provided and consumed by the movement of the front and rear guide rollers are both doubled. Specifically, assuming the moving frame 6 moves backward by 10 cm, the film between the front traction component 3 and the first front roller 51 will be 20 cm longer. This portion of film is supplied to the front traction roller for output. The rear traction component 2 requires 20 cm of film to reach the second rear roller 42, which is input by the rear traction roller. The film 1 between the moved first front roller 51 and the unmoved second rear roller 42 remains stationary. Therefore, during the sealing operation of the sealing device 7, i.e., during the pressing operation of the upper and lower sealing knives, the front traction component 3 and the rear traction component 2 maintain continuous film feeding, with the film being fed forward. The moving frame 6 then moves backward to accommodate the film. Figure 1Taking Example 1 as an example, the sealing device 7 is equipped with a set of components. The speed at which the moving frame 6 moves backward is half the traction linear speed of the front traction component 3 and the rear traction component 2. The front guide roller and the rear guide roller move backward with the moving frame 6, while the front transition roller 53 and the rear transition roller 43 remain stationary, offsetting the film length input by the rear traction component 2, maintaining film tension, and simultaneously providing the required film length to the front traction component 3. The upper sealing blade and the lower sealing blade remain stationary relative to the film they are pressing. This ensures sufficient sealing time for the film 4 even when the moving frame 6 moves at a relatively slow speed. After sealing is completed, the upper sealing blade and the lower sealing blade separate, the moving frame 6 moves forward and resets, and the film length pulled by the front traction component 3 and the rear traction component 2 remains consistent and continuously conveyed. Compared with the prior art, this improves production efficiency and provides sufficient time for film sealing, ensuring a firm seal and improving sealing quality.

[0017] The sealing device 7 is provided in two sets: a front sealing device 71 and a rear sealing device 72, which are longitudinally distributed. The two sets of sealing devices allow for the sealing of two parts or two bags in a single sealing operation, further reducing the moving speed of the moving frame 6 during resetting. With two sets of front guide rollers 5 and rear guide rollers 4, the backward movement speed of the moving frame 6 is only half the linear speed of the film pulled by the front traction component 3 and the rear traction component 2. This allows for a reasonable increase in the moving speed of the moving frame 6 and the linear speed of the traction components, accelerating the production speed of the bag-making machine and further improving its production efficiency.

[0018] See attached Figure 2 In the second embodiment, the front sealing device 71 and the rear sealing device 72 are fixed in the longitudinal position on the frame. A lifting roller 8 is provided between the front sealing device 71 and the rear sealing device 72 to adjust the length of the film between them. If the length of the film bag is longer, the lifting roller 8 moves upward, so that the length of the film 1 between the front sealing device 71 and the rear sealing device 72 becomes longer, and the sealing of the two bags is achieved in one sealing operation.

[0019] See attached Figure 3 In Embodiment 3, the longitudinal position of the front sealing device 71 on the frame is fixed, while the rear sealing device 72 can move longitudinally relative to the front sealing device 71 to adjust the distance between them. If the film bag is long, the rear sealing device 72 moves backward to increase the distance between it and the front sealing device 71, thus increasing the length of the film between them; conversely, if the film bag is short, the rear sealing device 72 moves forward to decrease the distance between it and the front sealing device 71.

Claims

1. A sealing mechanism for a film bag making machine, characterized in that: It includes a film conveying device and a sealing device; The sealing device includes an upper sealing blade and a lower sealing blade that move in relative vertical motion; The film conveying device includes a front traction component, a rear traction component, and a moving component. The moving component is disposed between the front traction component and the rear traction component. The front traction component and the rear traction component continuously traction at the same speed. - The moving component includes a moving frame that moves back and forth on the frame and front guide rollers and rear guide rollers mounted on the moving frame. There are at least two sets of front guide rollers and rear guide rollers. The sealing device operates between the first front guide roller and the last rear guide roller. A front transition roller is provided between adjacent front guide rollers and a rear transition roller is provided between adjacent rear guide rollers. Both the front transition rollers and the rear transition rollers are mounted on the frame.

2. The sealing mechanism of the film bag making machine according to claim 1, characterized in that: When the upper sealing knife and the lower sealing knife are pressing together, the moving frame moves in the opposite direction to the film conveying direction, and the upper sealing knife and the lower sealing knife remain stationary relative to the film they are pressing together. The upper and lower sealing blades separate, and the movable frame resets.

3. The sealing mechanism of the film bag making machine according to claim 1 or 2, characterized in that: The sealing device is provided in two sets, namely a front sealing device and a rear sealing device, which are distributed longitudinally.

4. The sealing mechanism of the film bag making machine according to claim 3, characterized in that: The front sealing device and the rear sealing device are fixed in the longitudinal position on the frame, and a lifting roller for adjusting the film length between the front sealing device and the rear sealing device is provided.

5. The sealing mechanism of the film bag making machine according to claim 3, characterized in that: The longitudinal position of the front sealing device on the frame is fixed, and the rear sealing device can move longitudinally relative to the front sealing device to adjust the distance between them.

6. The sealing mechanism of the film bag making machine according to claim 1 or 2, characterized in that: The first front guide roller and the last rear guide roller are at the same height.

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