Heat sealing device for plastic film processing

Abstract

The utility model relates to a heat-sealing device for plastic film processing, which comprises a base, a seat body, a heat-sealing cutter block and a hot-pressing limiting component, the seat body can vertically move towards the upper side of the base, the heat-sealing cutter block is arranged on the bottom side of the seat body, the limiting component comprises a hot-pressing part and a limiting part, the hot-pressing part comprises sealing and pressing limiting plates arranged on the front side and the rear side of the heat-sealing cutter block, and the limiting part is arranged on the sealing and pressing limiting plates. An elastic piece is connected between the top of the sealing and pressing limiting plate and the bottom of the base body, the limiting part comprises U-shaped pressing plates which are oppositely arranged on the left side and the right side of the heat sealing cutter block, and the two sets of U-shaped pressing plates move towards each other or away from each other; the bottom end face of the U-shaped pressing plate is flush with the top end face of the sealing and pressing limiting plate. According to the utility model, the plastic film is effectively prevented from being separated from the base due to adhesion when the heat-sealing cutter block is separated from the plastic film, so that the heat-sealing quality of the plastic film and the convenience of subsequent conveying are greatly improved, the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of plastic film processing technology, and in particular to a heat sealing device for plastic film processing. Background Technology

[0002] Hot-press sealing involves heating the material at the sealing point in a certain way until it reaches a viscous state, and then applying pressure to seal it. It is generally done using a hot-press sealing device or a hot-press sealing machine.

[0003] In the production of plastic films or packaging bags, heat sealing is a crucial process. In some current technologies, after heat sealing, when the heat sealing assembly detaches from the plastic film, the film may stick to it. This problem can have several serious negative consequences. During subsequent transport, the plastic film may detach from the heat sealing table due to adhesion, resulting in product defects, failure to meet quality requirements, and an increased defect rate. Adhesion can also cause the film to jam or shift during transport, reducing production efficiency. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing a heat-sealing device for processing plastic films. The specific technical solution is as follows:

[0005] A heat-sealing device for processing plastic film includes a base, a seat, a heat-sealing blade, and a heat-pressing limiting assembly. The seat can move vertically upwards. The heat-sealing blade is located on the bottom side of the seat. The limiting assembly includes a heat-pressing part and a limiting part. The heat-pressing part includes sealing and limiting plates disposed on the front and rear sides of the heat-sealing blade. An elastic element is connected between the top of the sealing and limiting plates and the bottom of the seat. The limiting part includes U-shaped pressure plates disposed on the left and right sides of the heat-sealing blade. The two sets of U-shaped pressure plates can move towards each other or away from each other. When the bottom of the sealing and limiting plate moves down to press the plastic film, the bottom end face of the U-shaped pressure plate is flush with the top end face of the sealing and limiting plate.

[0006] As an improvement to the above technical solution, it also includes a moving component for driving the seat body to move vertically upwards towards the base. The moving component includes a fixed frame and a hydraulic cylinder. The fixed frame is connected to the base, the hydraulic cylinder is mounted on the fixed frame, and the output rod of the hydraulic cylinder is fixedly connected to the seat body.

[0007] As an improvement to the above technical solution: the top of both sides of the sealing and limiting plate has a downward inclined surface, and an elastic gasket is connected to the inclined surface. The bottom end of the U-shaped pressure plate has an arc-shaped surface on the side close to the sealing and limiting plate. When the bottom of the sealing and limiting plate moves down to press the plastic film, the top height of the elastic gasket is greater than the bottom height of the arc-shaped surface.

[0008] As an improvement to the above technical solution, it also includes an adjustment assembly for driving the two sets of U-shaped pressure plates to move towards or away from each other. The adjustment assembly includes a mounting shell, a drive motor, and a threaded rod. The mounting shell is mounted on a fixed frame, and the drive motor is installed inside the mounting shell. The output shaft of the drive motor is connected to one end of the threaded rod, and the other end of the threaded rod is rotatably connected to the mounting shell. Two sets of nut blocks are symmetrically threaded on the threaded rod. The top end of each set of U-shaped pressure plates extends movably into the mounting shell and is fixedly connected to one of the nut blocks.

[0009] As an improvement to the above technical solution: a guide rod is fixedly connected inside the mounting shell and is arranged parallel to the threaded rod. One side of the nut block is slidably sleeved on the surface of the guide rod. The threaded rod is provided with threads of opposite direction, and the threads are adapted to the inner sidewall of the nut block.

[0010] As an improvement to the above technical solution: the elastic element includes a spring and a telescopic sleeve rod, the telescopic sleeve rod is connected between the seat body and the sealing and limiting plate, and the spring is sleeved on the surface of the telescopic sleeve rod.

[0011] The beneficial effects of this utility model are:

[0012] During heat sealing of plastic film, a hydraulic cylinder drives the base to make the heat sealing blade block move downwards to heat seal the plastic film. The sealing limit plate moves down simultaneously to press and limit both sides of the plastic film. After heat sealing, the two sets of U-shaped pressure plates move towards each other, so that the bottom of the U-shaped pressure plates tightly abut against the sealing limit plate, allowing the sealing limit plate to further press the plastic film. This effectively prevents the plastic film from sticking to the base when the heat sealing blade block comes off, greatly improving the quality of plastic film heat sealing and the convenience of subsequent transportation, increasing production efficiency and reducing production costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0015] Figure 3 This is a schematic diagram of the adjustment component in this utility model;

[0016] Figure 4 This is a schematic diagram of the structure of the heat-sealing blade block and the sealing and limiting plate in this utility model.

[0017] Reference numerals in the attached drawings: 1. Base; 2. Fixed frame; 3. Hydraulic cylinder; 4. Mounting shell; 5. U-shaped pressure plate; 6. Sealing body; 7. Heat sealing blade block; 8. Spring; 9. Telescopic sleeve rod; 10. Sealing limit plate; 101. Inclined surface; 11. Elastic gasket; 12. Drive motor; 13. Threaded rod; 14. Nut block; 15. Guide rod. Detailed Implementation

[0018] 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 the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] Example

[0020] Please refer to Figures 1-4 This utility model provides a heat sealing device for processing plastic film. Through a unique structural design, it effectively solves the problem of inconvenient subsequent transportation caused by the adhesion of plastic film to the heat sealing component during the heat sealing process.

[0021] The heat sealing device for plastic film processing mainly consists of a base 1, a seat 6, a heat sealing blade 7, and a heat pressure limiting assembly. The seat 6 can move axially in a direction perpendicular to the top of the base 1, and the heat sealing blade 7 is fixedly installed on the bottom side of the seat 6. The heat pressure limiting assembly includes a heat pressing part and a limiting part. The heat pressing part consists of sealing and limiting plates 10 disposed on the front and rear sides of the heat sealing blade 7, and an elastic element is connected between the top of the sealing and limiting plates 10 and the bottom of the seat 6.

[0022] The limiting part is composed of U-shaped pressure plates 5 arranged on the left and right sides of the heat sealing blade block 7. The two sets of U-shaped pressure plates 5 can move towards each other or away from each other. When the bottom of the sealing limiting plate 10 moves down to press the plastic film, the bottom end surface of the U-shaped pressure plate 5 is flush with the top end surface of the sealing limiting plate 10.

[0023] To achieve axial movement of the seat 6 upwards from the base 1, this application includes a moving assembly. This assembly comprises a fixed frame 2 and a hydraulic cylinder 3. The fixed frame 2 is securely connected to the base 1 by welding or bolting to ensure the stability of the entire device. The hydraulic cylinder 3 is bolted to the fixed frame 2, and its output rod is fixedly connected to the seat 6 via a flange and bolts. When the output rod of the hydraulic cylinder 3 extends or retracts, it precisely drives the seat 6 to move up and down, thereby controlling the working position of the heat-sealing blade 7.

[0024] The top of both sides of the sealing and limiting plate 10 has downward-sloping surfaces 101, with an angle of 30-60 degrees between them and the sealing and limiting plate 10. Elastic gaskets 11 are attached to the slopes 101 with strong adhesive. The bottom of the U-shaped pressure plate 5, near the sealing and limiting plate 10, has an arc-shaped surface. When the bottom of the sealing and limiting plate 10 moves downward to press the plastic film, the top height of the elastic gasket 11 is greater than the bottom height of the arc-shaped surface. This structural design allows the U-shaped pressure plate 5 to better contact the sealing and limiting plate 10 via the elastic gasket 11 when it moves towards the sealing and limiting plate 10, thereby limiting the contact of the sealing and limiting plate 10 with the plastic film and effectively preventing the plastic film from detaching from the base 1 as the heat-sealing blade block 7 moves upward.

[0025] It also includes an adjustment assembly for driving the two sets of U-shaped pressure plates 5 to move towards or away from each other. The adjustment assembly includes a mounting housing 4, a drive motor 12, and a threaded rod 13. The mounting housing 4 is bolted to the fixed frame 2. The drive motor 12 is bolted inside the mounting housing 4. The output shaft of the drive motor 12 is connected to one end of the threaded rod 13 via a coupling. The other end of the threaded rod 13 is rotatably connected to the mounting housing 4 via a bearing. Two sets of nut blocks 14 are symmetrically threaded onto the threaded rod 13. The top of each set of U-shaped pressure plates 5 extends movably into the mounting housing 4 and is fixedly connected to one nut block 14 by bolts. By rotating the drive motor 12 in both directions, the threaded rod 13 is rotated, thereby causing the two sets of nut blocks 14 to move towards or away from each other on the threaded rod 13, achieving synchronous movement of the U-shaped pressure plates 5.

[0026] Inside the mounting housing 4, a guide rod parallel to the threaded rod 13 is fixedly connected by welding. A through hole adapted to the guide rod is provided on one side of the nut block 14, through which the nut block 14 slides onto the surface of the guide rod. The threaded rod 13 has threads with opposite directions, and these threads are adapted to the inner wall of the nut block 14. The guide rod ensures the stability of the nut block 14 during movement, preventing it from rotating with the threaded rod 13 and guaranteeing the movement accuracy of the U-shaped pressure plate 5.

[0027] The elastic element includes a spring 8 and a telescopic sleeve 9. The top end of the telescopic sleeve 9 is fixed to the bottom of the base 6 by welding or threaded connection, and the bottom end of the telescopic sleeve 9 is connected to the top of the sealing and limiting plate 10 in the same way. The spring 8 is sleeved on the surface of the telescopic sleeve 9, with the top end of the spring 8 abutting against the bottom of the base 6 and the bottom end of the spring 8 abutting against the top of the sealing and limiting plate 10.

[0028] In the natural state of the elastic element, the distance between the sealing and limiting plate 10 and the base 1 is greater than the distance between the heat sealing blade 7 and the base 1. This structural design allows the sealing and limiting plate 10 to contact the plastic film before the heat sealing blade 7 and provide a certain pre-pressure during the heat sealing process. At the same time, after the heat sealing is completed, it can better cooperate with the U-shaped pressure plate 5 to limit the plastic film.

[0029] Specifically, when heat-sealing the plastic film, the plastic film is placed at a designated position on the base 1. The hydraulic cylinder 3 is activated, and its output rod extends, causing the base 6 to move downwards, along with the heat-sealing blade 7. Before the heat-sealing blade 7 contacts the plastic film, the sealing limit plate 10 first contacts the plastic film. Due to the elastic element, the sealing limit plate 10 applies a certain pressure to the plastic film, providing initial fixation. At this time, the spring 8 is compressed, and the telescopic sleeve 9 retracts accordingly.

[0030] As the heat-sealing blade 7 continues to move downwards to heat-seal the plastic film, the sealing and limiting plate 10 continuously presses against both sides of the plastic film to prevent displacement during the heat-sealing process. The heat-sealing blade 7 is energized and heated to a suitable temperature before performing the heat-sealing operation on the plastic film.

[0031] After heat sealing is completed, the drive motor 12 is started, and the drive motor 12 rotates forward, driving the threaded rod 13 to rotate. Since the threaded rod 13 has threads with opposite directions, the two sets of nut blocks 14 move towards each other on the threaded rod 13, thereby driving the two sets of U-shaped pressure plates 5 to move towards each other. The arc-shaped surface at the bottom of the U-shaped pressure plate 5 gradually contacts the sealing and limiting plate 10 through the elastic gasket 11, so that the sealing and limiting plate 10 further presses the plastic film. At this time, even if there is a certain adhesive force between the heat sealing blade 7 and the plastic film, the synergistic effect of the U-shaped pressure plate 5 and the sealing and limiting plate 10 can effectively prevent the plastic film from detaching from the base 1 due to adhesion.

[0032] Afterwards, the output rod of hydraulic cylinder 3 retracts, causing the base 6 and heat-sealing blade 7 to move upwards back to their initial positions. Simultaneously, drive motor 12 reverses, causing the U-shaped pressure plate 5 to move away from its initial position. The sealing limit plate 10 also returns to its initial position under the action of spring 8, completing one heat-sealing operation.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heat sealing device for processing plastic film, characterized by comprising: The utility model relates to a heat sealing device for plastic film, which comprises a base (1), a seat body (6), a heat sealing blade (7) and a heat pressing limiting assembly, the seat body (6) can move vertically upwards towards the base (1), and the heat sealing blade (7) is arranged on the bottom side of the seat body (6). The limiting assembly comprises a heat pressing part and a limiting part, the heat pressing part comprises sealing and pressing limiting plates (10) arranged on the front and back sides of the heat sealing blade (7), elastic members are connected between the top of the sealing and pressing limiting plates (10) and the bottom of the seat body (6), the limiting part comprises U-shaped pressing plates (5) arranged on the left and right sides of the heat sealing blade (7) in a facing manner, and the two groups of U-shaped pressing plates (5) can move towards or away from each other, when the bottom of the sealing and pressing limiting plates (10) moves downwards to press the plastic film, the bottom end surface of the U-shaped pressing plate (5) is flush with the top end surface of the sealing and pressing limiting plate (10).

2. The heat sealing apparatus for processing plastic film according to claim 1, wherein: The utility model further comprises a moving assembly for driving the seat body (6) to move vertically upwards towards the base (1), the moving assembly comprises a fixed frame (2) and a hydraulic cylinder (3), the fixed frame (2) is connected to the base (1), the hydraulic cylinder (3) is installed on the fixed frame (2), and the output rod of the hydraulic cylinder (3) is fixedly connected to the seat body (6).

3. The heat sealing apparatus for processing plastic film according to claim 2, wherein: The top of the left and right sides of the sealing and pressing limiting plate (10) is provided with an inclined downward inclined surface (101), the inclined surface (101) is connected to an elastic gasket (11), and the side of the bottom end of the U-shaped pressing plate (5) close to the sealing and pressing limiting plate (10) is provided with an arc surface. When the bottom of the sealing and pressing limiting plate (10) moves downwards to press the plastic film, the top end height of the elastic gasket (11) is greater than the bottom end height of the arc surface.

4. The heat sealing apparatus for plastic film processing according to claim 3, wherein: The utility model further comprises an adjusting assembly for driving the two groups of U-shaped pressing plates (5) to move towards or away from each other, the adjusting assembly comprises a mounting shell (4), a driving motor (12) and a threaded rod (13), the mounting shell (4) is installed on the fixed frame (2), the driving motor (12) is installed in the mounting shell (4), the output shaft of the driving motor (12) is connected to one end of the threaded rod (13), the other end of the threaded rod (13) is rotatably connected to the mounting shell (4), two groups of nut blocks (14) are symmetrically connected to the threaded rod (13), and the top end of each group of U-shaped pressing plates (5) is fixedly connected to one nut block (14) after extending to the inside of the mounting shell (4).

5. The heat sealing apparatus for processing plastic film according to claim 4, wherein: The inside of the mounting shell (4) is fixedly connected to a guide rod (15) arranged in parallel with the threaded rod (13), one side of the nut block (14) is slidably sleeved to the surface of the guide rod (15), and the threaded rod (13) is provided with threads in opposite directions, which are matched with the inner side wall of the nut block (14).

6. The heat sealing apparatus for processing plastic film according to claim 5, wherein: The elastic member comprises a spring (8) and a telescopic sleeve rod (9), the telescopic sleeve rod (9) is connected between the seat body (6) and the sealing and pressing limiting plate (10), and the spring (8) is sleeved to the surface of the telescopic sleeve rod (9).

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