A plastic film heat sealing mechanism

Abstract

The utility model discloses a kind of plastic film heat sealing mechanism, which belongs to heat sealing equipment technical field.It mainly includes: main body and cover body, its cover body is fixed in main body top, and cover body top is fixed with operating screen, it is characterized by: the side of the main body is equipped with correction mechanism, and correction mechanism slides along its main body surface;The side of the correction component is also fixed with heat sealing mechanism;The side of heat sealing mechanism away from heat sealing mechanism is fixed with feeding mechanism;Wherein, correction mechanism and feeding mechanism cooperate motion.The utility model is matched by adopting pressure switch and with multiple groups of self-adjustable conveying roller, so that film can be automatically adjusted when feeding deflection, to improve the qualified rate and aesthetic property of film heat sealing.The utility model is mainly used for the structure optimization of existing plastic film heat sealing mechanism.

Description

Technical Field

[0001] This utility model belongs to the technical field of heat sealing equipment, and more specifically, it relates to a heat sealing mechanism for plastic film. Background Technology

[0002] Plastic films have advantages such as light weight, good barrier properties, and low cost, and are widely used in packaging production in the food, daily chemical, and pharmaceutical industries. The heat sealing mechanism is the core equipment for plastic film packaging. The heat sealing mechanism applies temperature and pressure to the overlapping area of ​​the film through heating elements, causing the film to melt and cool to solidify, forming a sealed packaging structure (such as bag body or roll sealing), which directly determines the sealing performance and appearance quality of the packaging.

[0003] The lack of automatic film adjustment in existing equipment, coupled with factors such as feeding direction deviation, feeding roller installation misalignment, and wear and tear on the feeding rollers over long-term use, can lead to uneven lateral force on the film during feeding, causing film skewing. Skewed seals not only affect the aesthetics of the packaging but also pose a risk of heat-sealing failure. For example, in food packaging, this could lead to leakage and spoilage; in pharmaceutical packaging, it could disrupt the sterile environment and compromise product safety.

[0004] Therefore, there is an urgent need for a heat-sealing mechanism that can automatically adjust the film feeding deviation in order to improve the pass rate and aesthetics of film heat sealing. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a plastic film heat sealing mechanism, which uses a pressure switch in conjunction with multiple sets of self-adjustable conveying rollers to enable automatic adjustment when the film is fed off course, thereby improving the pass rate and aesthetics of film heat sealing.

[0006] The aforementioned plastic film heat sealing mechanism includes a main body and a cover, the cover being fixed to the top of the main body, and an operation screen being fixed to the top of the cover. The mechanism is characterized in that: a correction mechanism is provided on one side of the main body, and the correction mechanism slides along the surface of the main body; a heat sealing mechanism is also fixed on one side of the correction mechanism; a feeding mechanism is fixed on the side of the heat sealing mechanism away from the heat sealing mechanism; wherein the correction mechanism and the feeding mechanism move in coordination.

[0007] Preferably, the calibration mechanism includes an adjustment component and a calibration component. Multiple adjustment components are provided and symmetrically fixed to the top of the main body. The calibration component is fixedly connected to the adjustment component and slides along with the adjustment component.

[0008] Preferably, the calibration assembly includes a connector, a connecting plate, and pressure sensors. The two ends of the connector are fixedly connected to symmetrically arranged adjustment components and move with the adjustment components. The connecting plate is fixedly connected to the connector, and multiple pressure sensors are fixed on one side of the connecting plate.

[0009] Preferably, the adjustment assembly includes a gantry frame, an adjustment block, and a gear rail. Multiple gantry frames are provided and are fixedly connected to the main body in a symmetrical manner. The two ends of the adjustment block are fitted into the gantry frame and slidably connected to the gantry frame. The gear rail is located below the adjustment block and is fixedly connected to the main body, and the adjustment block meshes with the gear rail.

[0010] Preferably, the heat sealing mechanism includes a bracket, a pressure rod, an upper heating plate, and a lower heating plate. The bracket is located on one side of the correction mechanism and is fixedly connected to the main body. Multiple pressure rods are provided and fixedly connected to the bracket. The upper heating plate and the lower heating plate are arranged symmetrically and are fixedly connected to the pressure rod and the main body, respectively.

[0011] Preferably, the feeding mechanism includes a working frame, a driving component, and a conveying component. The working frame is fixed to the top of the main body and located on one side of the heat sealing mechanism. Part of the structure of the driving component protrudes into the working frame, and part of the component extends into the main body. Multiple conveying components are provided and are symmetrically embedded in the working frame and slide along the inner side of the working frame. At the same time, part of the conveying component is movably connected to the driving component.

[0012] Preferably, the drive assembly includes a drive motor, a drive rod, a drive wheel, and a connecting wheel. The drive rod includes a first drive rod and a second drive rod. One end of the first drive rod is rotatably connected to the middle of the work frame, and the other end is rotatably connected to the side wall of the work frame, protruding out of the work frame and fixedly connected to the power output end of the drive motor fixed on the surface of the main body. The second drive rod is disposed inside the main body, parallel to the vertical direction of the first drive rod, and a connecting wheel is fixed to the end of the second drive rod. A drive wheel is fixed to the power output end of the drive motor, and the drive wheel meshes with the driven wheel.

[0013] Preferably, the conveying assembly includes a frame, a first roller, and a second roller, wherein the first roller and the second roller are embedded in the frame, and the first roller is movably connected to a first drive rod, and the second roller is movably connected to a second drive rod; wherein the frame slides along the first drive rod and the second drive rod.

[0014] Preferably, the top of the work frame is also provided with a synchronization component, including a synchronization gear, a rack, a connecting rod, and a knob. One side of the synchronization gear is rotatably connected to the top of the work frame. Multiple racks are provided and are fixedly connected to different frames in an alternating manner, and mesh with the synchronization gear. One end of the connecting rod is fixedly connected to the synchronization gear, and the other end protrudes out of the cover body and is fixedly connected to the knob.

[0015] Preferably, the feeding mechanism further includes a distance sensor, which consists of a laser emitter and a receiver; multiple distance sensors are provided, respectively fixed at both ends of one side of the work frame; the number of receivers is adapted to the number of laser emitters, and the receivers are fixedly connected to the frame; wherein the laser emitters and receivers are on the same straight line.

[0016] Compared with the prior art, the beneficial effects of this utility model are: 1. A pressure switch is used in conjunction with multiple sets of self-adjusting conveyor rollers to automatically adjust the film when the feeding is skewed, thereby improving the yield and appearance of the film heat sealing. Attached Figure Description

[0017] Figure 1 This is the front view of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the calibration component structure of this utility model; Figure 4 This is a schematic diagram of the adjustment component structure of this utility model; Figure 5 This is a schematic diagram of the adjusting block structure of this utility model; Figure 6 This is a schematic diagram of the heat sealing mechanism of this utility model; Figure 7 This is a front view of the conveying structure of this utility model; Figure 8 This is a schematic diagram of the conveying structure assembly of this utility model; Figure 9 This is a schematic diagram of the conveying component structure of this utility model; Figure 10 This is a schematic diagram of the frame structure of this utility model.

[0018] In the diagram, 1. Main body; 11. Cover; 12. Operation panel; 13. Scale; 2. Calibration mechanism; 21. Calibration component; 211. Connecting seat; 212. Connecting plate; 213. Pressure sensor; 22. Adjustment component; 221. Gantry frame; 221A. Slide groove; 222. Gear rail; 223. Adjustment block; 2231. Housing; 2232. Pressure plate; 2233. Spring; 2234. Sealing plate; 2235. Inclined plate; 2236. Cavity; 2237. Pressure tongue; 2238. Tooth; 2239. Synapse; 224. Slide rail; 2241. Baffle; 3. Heat sealing mechanism; 31. Bracket; 32. Pressure rod; 33. Upper heating plate 34. Lower heating plate; 4. Feeding mechanism; 41. Working frame; 42. Drive assembly; 421. Drive motor; 422. Drive rod; 422A. First drive rod; 422B. Second drive rod; 422C. Protrusion; 423. Drive wheel; 424. Linking wheel; 43. Conveying assembly; 431. Frame; 4311. Protruding plate; 432. First roller; 433. Second roller; 44. Synchronization assembly; 441. Synchronization gear; 442. Rack; 4421. Connecting sleeve; 443. Connecting rod; 444. Knob; 445. Auxiliary roller; 45. Distance sensor; 451. Laser emitter; 452. Receiver; 46. Drive frame. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings: The directional terms used in the detailed description paragraphs are only for the convenience of those skilled in the art to understand the technical solutions described in this application based on the visual orientation shown in the accompanying drawings. Unless otherwise expressly specified and limited, the terms "setting," "installation," "connection," etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] like Figure 1 and Figure 2 As shown, a plastic film heat sealing mechanism 3 includes a main body 1 and a cover 11, the cover 11 being fixed to the top of the main body 1, and an operation screen 12 being fixed to the top of the cover 11. The mechanism is characterized in that: a correction mechanism 2 is provided on one side of the main body 1, and the correction mechanism 2 slides along the surface of the main body 1; a heat sealing mechanism 3 is also fixed on one side of the correction mechanism; a feeding mechanism is fixed on the side of the heat sealing mechanism 3 away from the heat sealing mechanism 3; wherein the correction mechanism 2 and the feeding mechanism move in coordination.

[0021] like Figure 2 and 3As shown, the calibration mechanism 2 includes an adjustment component 22 and a calibration component 21. Multiple adjustment components 22 are symmetrically fixed to the top of the main body 1. The calibration component 21 is fixedly connected to the adjustment components 22 and slides along with them. Thus, the calibration component 21, in cooperation with the adjustment components 22, controls the distance between the heat-sealed portion and the film opening to accommodate different sealing requirements.

[0022] like Figure 3 As shown, the calibration component 21 includes a connecting base 211, a connecting plate 212, and pressure sensors 213. The two ends of the connecting base 211 are fixedly connected to symmetrically arranged adjustment components 22 and move with the adjustment components 22. The connecting plate 212 is fixedly connected to the connecting base 211, and multiple pressure sensors 213 are fixed to one side of the connecting plate 212. Thus, the multiple pressure sensors 213 are distributed at the end of the connecting plate 212 facing the feeding direction. During the feeding process, the film end touches the pressure sensors 213 to determine if the film is skewed. For example, when the entire end of the film touches the pressure sensors 213, it means that the end of the film is parallel to the heat-sealing mechanism 3 and there is no skew. Conversely, when the end of the film is skewed, it cannot touch all the pressure sensors 213, indicating that the film is not parallel to the heat-sealing mechanism 3. In this case, the film is automatically adjusted by the feeding mechanism to make the film end parallel to the heat-sealing mechanism 3.

[0023] Optionally, the pressure sensor 213 may include, but is not limited to, a piezoelectric touch sensor. In this way, by utilizing the high sensitivity of the piezoelectric touch sensor, the touch action of the thin film can be detected, thereby improving the accuracy of thin film skew detection.

[0024] like Figure 4 As shown, the adjustment assembly 22 includes a gantry frame 221, an adjustment block 223, and a gear rail 222. Multiple gantry frames 221 are provided and fixedly connected to the main body 1 in a symmetrical manner. The two ends of the adjustment block 223 are fitted into and slidably connected to the gantry frame 221. The gear rail 222 is located below the adjustment block 223 and is fixedly connected to the main body 1, with the adjustment block 223 meshing with the gear rail 222. In this way, the gantry frame 221 limits the adjustment block 223, allowing it to slide only along the inner side of the gantry frame 221. Simultaneously, the meshing of the adjustment block 223 with the gear rail 222 achieves a locking mechanism, ensuring that the calibration assembly 21, fixedly connected to the adjustment block 223, remains stable and does not easily shake after locking, further improving the accuracy of detecting film skew.

[0025] Optionally, the top of the gantry 221 is provided with a sliding groove 221A, and the sliding groove 221A is adapted to and connected to the adjusting block 223.

[0026] like Figure 5 As shown, the adjusting block 223 includes a housing 2231, a pressure plate 2232, a spring 2233, a sealing plate 2234, and an inclined plate 2235. The housing 2231 has an internal cavity 2236 with multiple openings. One end of the cavity 2236 has an integrally formed pressure tongue 2237. The pressure plate 2232 is hinged to the cavity 2236, with one end protruding out of the housing 2231 and located above the pressure tongue 2237. The other end of the pressure plate 2232 has teeth 2238 at its bottom, which protrude out to the bottom of the housing 2231 and mesh with the toothed rail 222. The spring 2233 is fixed to the side of the teeth 2238 facing away from the toothed rail 222 and abuts against the sealing plate 2234 fixed to the top of the housing 2231. The inclined plate 2235 is fixed to one end of the housing 2231 and is used to fix the connecting seat 211. Thus, if it is necessary to adjust the distance between the calibration component 21 and the heat sealing mechanism 3 before operation, the teeth 2238 are disengaged from the gear rail 222 by pressing the pressure tongue 2237 and the pressure plate 2232, thereby unlocking the adjusting block 223. After moving the adjusting block 223 to the appropriate position, the pressure tongue 2237 and the pressure plate 2232 are released. Using the elasticity of the spring 2233, the end of the pressure plate 2232 with the teeth 2238 is pushed to re-engage with the gear rail 222, thus locking the adjusting block 223.

[0027] Optionally, the top two ends of the housing 2231 are provided with protrusions 2239 near the edge, and the protrusions 2239 are embedded in the grooves 221A.

[0028] Optionally, a scale 13 is provided on the side wall of the main body 1, located on one side of the gantry 221. In this way, the position of the adjustment block 223 can be directly observed through the scale 13, so as to ensure that the parallel adjustment block 223 is always in the same straight position, and to avoid the calibration component 21 from being skewed.

[0029] Optionally, slide rails 224 are provided on both sides of the gantry 221 located at the edge of the main body 1, and baffles 2241 are provided inside the slide rails 224, with one end of the baffles 2241 fixedly connected to the housing 2231. In this way, by setting the baffles 2241, one side of the gantry 221 can be sealed off when the adjusting block 223 moves to any position, isolating the internal space of the equipment from direct contact with the external space. This effectively improves the safety of the equipment and prevents danger caused by fingers or foreign objects entering the internal space of the equipment.

[0030] like Figure 6As shown, the heat-sealing mechanism 3 includes a support 31, pressure rods 32, an upper heating plate 33, and a lower heating plate 34. The support 31 is located on one side of the correction mechanism 2 and is fixedly connected to the main body 1. Multiple pressure rods 32 are provided and fixedly connected to the support 31. The upper heating plate 33 and the lower heating plate 34 are arranged symmetrically and fixedly connected to the pressure rods 32 and the main body 1, respectively. Thus, the upper heating plate 33 is positioned directly above the lower heating plate 34 via the support 31, and the multiple pressure rods 32 apply uniform downward pressure to the upper heating plate 33, enabling the upper heating plate 33 to press all parts of the film onto the surface of the lower heating plate 34 with the same force, thereby completing the heat-sealing action of the film.

[0031] like Figure 7 As shown, the feeding mechanism 4 includes a working frame 41, a drive assembly 42, and a conveying assembly 43. The working frame 41 is fixed to the top of the main body 1 and located on one side of the heat sealing mechanism 3. Part of the drive assembly 42 protrudes into the working frame 41, and part of the drive assembly 42 extends into the main body 1. Multiple conveying assemblies 43 are provided and symmetrically embedded in the working frame 41, sliding along the inner side of the working frame 41. Simultaneously, part of the conveying assembly 43 is movably connected to the drive assembly 42. Thus, the drive assembly 42 and the conveying assembly 43 use the working frame 41 as their operating carrier, enabling the drive assembly 42 to drive the conveying assembly 43 to perform input or output actions.

[0032] Optionally, multiple drive components 42 and conveyor components 43 are provided, respectively located at both ends of the work frame 41, and the drive components 42 at both ends of the work frame 41 can independently drive the conveyor components 43 at the same end. In this way, the drive components 42 and conveyor components 43 at both ends of the work frame 41, which can operate independently, can achieve opposite actions of output at one end and input at the other end. Through the opposite actions at both ends, the skewed film can be adjusted. For example, when the calibration component 21 detects that the left end of the film is skewed, the conveyor component 43 located at the left end of the work frame 41 starts a conveying action, while the conveyor component 43 at the right end starts an output action, and the skewed film is adjusted by using the rotation difference.

[0033] like Figure 8As shown, the drive assembly 42 includes a drive motor 421, a drive rod 422, a drive wheel 423, and a connecting wheel 424. The drive rod 422 includes a first drive rod 422A and a second drive rod 422B. One end of the first drive rod 422A is rotatably connected to the middle of the work frame 41, and the other end is rotatably connected to the side wall of the work frame 41, and protrudes out of the work frame 41 and is fixedly connected to the power output end of the drive motor 421 fixed on the surface of the main body 1. The second drive rod 422B is disposed inside the main body 1, parallel to the vertical direction of the first drive rod 422A, and the end of the second drive rod 422B is fixed with a connecting wheel 424. The drive wheel 423 is fixed on the power output end of the drive motor 421, and the drive wheel 423 meshes with the driven wheel. In this way, with the cooperation of the drive wheel 423 and the connecting wheel 424, the first drive rod 422A and the second drive rod 422B, which are arranged in parallel, can be driven synchronously at the same time, and the rotation directions of the first drive rod 422A and the second drive rod 422B are opposite. This synchronous counter-rotation design can ensure that the two films can move synchronously when conveying or outputting the film, avoiding the film from shifting during conveying or being pulled during output.

[0034] like Figure 8 and Figure 9 As shown, both the first drive rod 422A and the second drive rod 422B have protrusions 422C on their outer walls. Thus, through the protrusions 422C, the first drive rod 422A and the second drive rod 422B allow the conveying assembly 43 to slide along the first drive rod 422A and the second drive rod 422B, while some components can also rotate synchronously with the first drive rod 422A and the second drive rod 422B, achieving the multi-purpose function of the conveying assembly 43.

[0035] Optionally, the inner center of the work frame 41 and the main body 1 are provided with multiple drive frames that are adapted to the first drive rod 422A and / or the second drive rod 422B. In this way, the drive frames can support the first drive rod 422A and / or the second drive rod 422B, so that the first drive rod 422A and / or the second drive rod 422B can always maintain a stable working state.

[0036] like Figure 8 and Figure 9As shown, the conveying assembly 43 includes a frame 431, a first roller 432, and a second roller 433. The first roller 432 and the second roller 433 are embedded in the frame 431, and the first roller 432 is movably connected to the first drive rod 422A, while the second roller 433 is movably connected to the second drive rod 422B. The frame 431 slides along the first drive rod 422A and the second drive rod 422B. Thus, while the first roller 432 and the second roller 433 are embedded in the frame 431, they are also rotatably connected to the first drive rod 422A and the second drive rod 422B, respectively, allowing the first roller 432 and the second roller 433 to slide with the frame 431 and rotate with each drive rod 422.

[0037] like Figure 10 As shown, one side of the frame 431 is provided with an integrally formed protruding plate 4311, and the protruding plate 4311 is inclined to one side. In this way, the protruding plate 4311 can guide the film during the material conveying process, so as to reduce the probability of film skewing.

[0038] like Figure 8 As shown, the top of the work frame 41 is also equipped with a synchronization component 44, including a synchronization gear 441, a rack 442, a connecting rod 443, and a knob 444. One side of the synchronization gear 441 is rotatably connected to the top of the work frame 41. Multiple racks 442 are provided, fixedly connected to different frames 431 in an alternating manner, and mesh with the synchronization gear 441. One end of the connecting rod 443 is fixedly connected to the synchronization gear 441, and the other end protrudes out of the cover 11 and is fixedly connected to the knob 444. Thus, when the synchronization gear 441 is rotated, the racks 442 meshing with the synchronization gear 441 in an alternating manner can move in opposite directions, driving the conveying components 43 fixedly connected to the racks 442 to move synchronously, thereby adjusting the spacing between the conveying components 43 to accommodate films of different widths.

[0039] Optionally, a connecting sleeve 4421 for connecting the frame 431 is fixed to the bottom of the rack 442. In this way, when the connecting sleeve 4421 is fixedly connected to the frame 431, a sliding cavity adapted to the work frame 41 is defined between the two, so that the connecting sleeve 4421 and the frame 431 can always maintain a sliding connection with the work frame 41.

[0040] Optionally, the synchronization assembly 44 further includes multiple auxiliary rollers 445, symmetrically fixed to the top of the work frame 41 and in contact with the rack 442. In this way, the auxiliary rollers 445 can support the rack 442, preventing it from bending due to the long cantilever distance. This not only ensures stable movement of the rack 442 but also extends its service life. like Figure 8As shown, the feeding mechanism 4 also includes distance sensors 45, which consist of a laser emitter 451 and a receiver 452. Multiple distance sensors 45 are provided, each fixed to one end of the work frame 41. The number of receivers 452 matches the number of laser emitters 451, and the receivers 452 are fixedly connected to the frame 431. The laser emitters 451 and receivers 452 are on the same straight line. Thus, through the cooperation of the laser emitters 451 and receivers 452, the accurate position of the conveying assembly 43 on the work frame 41 can be obtained, allowing the pressure sensor 213 at the corresponding position to be activated in a timely manner.

[0041] For example, when the conveyor assembly 43 moves to one-third of the work stand 41, the distance sensor 45 obtains the accurate position of the conveyor assembly 43. At this time, all pressure sensors 213 on the left side of the calibration assembly 21 at one-third of its position are turned off, while the pressure sensors 213 on its right side remain on. This ensures compatibility with films of different widths and improves the accuracy of film skew detection.

[0042] Finally, although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A heat-sealing mechanism for a plastic film, comprising a main body (1) and a cover (11), wherein the cover (11) is fixed to the top of the main body (1), and an operation screen (12) is fixed to the top of the cover (11), characterized in that: The main body (1) is provided with a correction mechanism (2) on one side, and the correction mechanism (2) slides along the surface of the main body (1); a heat sealing mechanism (3) is also fixed on one side of the correction mechanism (2); a feeding mechanism (4) is fixed on the side of the heat sealing mechanism (3) away from the heat sealing mechanism (3); wherein the correction mechanism (2) and the feeding mechanism (4) move together.

2. The heat-sealing mechanism for a plastic film according to claim 1, characterized in that: The calibration mechanism (2) includes a calibration component (21) and an adjustment component (22). Multiple adjustment components (22) are provided and are symmetrically fixed on the top of the main body (1). The calibration component (21) is fixedly connected to the adjustment component (22) and slides with the adjustment component (22).

3. A heat-sealing mechanism for a plastic film according to claim 2, characterized in that: The calibration component (21) includes a connector (211), a connecting plate (212), and a pressure sensor (213). The two ends of the connector (211) are fixedly connected to the symmetrically arranged adjustment component (22) and move with the adjustment component (22). The connecting plate (212) is fixedly connected to the connector (211), and multiple pressure sensors (213) are fixed on one side of the connecting plate (212).

4. A heat-sealing mechanism for a plastic film according to claim 2, characterized in that: The adjustment component (22) includes a gantry frame (221), a gear rail (222), and an adjustment block (223). There are multiple gantry frames (221) which are fixedly connected to the main body (1) in a symmetrical manner. The two ends of the adjustment block (223) are fitted into the gantry frame (221) and are slidably connected to the gantry frame (221). The gear rail (222) is located below the adjustment block (223) and is fixedly connected to the main body (1), and the adjustment block (223) meshes with the gear rail (222).

5. A heat-sealing mechanism for a plastic film according to claim 1, characterized in that: The heat sealing mechanism (3) includes a bracket (31), a pressure rod (32), an upper heating plate (33), and a lower heating plate (34). The bracket (31) is located on one side of the correction mechanism (2) and is fixedly connected to the main body (1). There are multiple pressure rods (32) and they are fixedly connected to the bracket (31). The upper heating plate (33) and the lower heating plate (34) are arranged symmetrically and are fixedly connected to the pressure rod (32) and the main body (1), respectively.

6. A heat-sealing mechanism for a plastic film according to claim 1, characterized in that: The feeding mechanism (4) includes a work frame (41), a drive assembly (42), and a conveying assembly (43). The work frame (41) is fixed to the top of the main body (1) and located on one side of the heat sealing mechanism (3). Part of the structure of the drive assembly (42) protrudes into the work frame (41), and part of the assembly extends into the main body (1). There are multiple conveying assemblies (43), which are symmetrically embedded in the work frame (41) and slide along the inner side of the work frame (41). At the same time, part of the structure of the conveying assembly (43) is movably connected to the drive assembly (42).

7. A heat-sealing mechanism for a plastic film according to claim 6, characterized in that: The drive assembly (42) includes a drive motor (421), a drive rod (422), a drive wheel (423), and a connecting wheel (424). The drive rod (422) includes a first drive rod (422A) and a second drive rod (422B). One end of the first drive rod (422A) is rotatably connected to the middle of the work frame (41), and the other end is rotatably connected to the side wall of the work frame (41). It protrudes out of the work frame (41) and is fixedly connected to the power output end of the drive motor (421) fixed on the surface of the main body (1). The second drive rod (422B) is located inside the main body (1) and is parallel to the vertical direction of the first drive rod (422A). The end of the second drive rod (422B) is fixed with a connecting wheel (424). The drive wheel (423) is fixed on the power output end of the drive motor (421), and the drive wheel (423) meshes with the driven wheel.

8. A heat-sealing mechanism for a plastic film according to claim 6, characterized in that: The conveying assembly (43) includes a frame (431), a first roller (432), and a second roller (433). The first roller (432) and the second roller (433) are embedded in the frame (431), and the first roller (432) is movably connected to the first drive rod (422A), and the second roller (433) is movably connected to the second drive rod (422B). The frame (431) slides along the first drive rod (422A) and the second drive rod (422B).

9. A heat-sealing mechanism for a plastic film according to claim 6, characterized in that: The top of the work frame (41) is also provided with a synchronization component (44), including a synchronization gear (441), a rack (442), a connecting rod (443), and a knob (444). One side of the synchronization gear (441) is rotatably connected to the top of the work frame (41). There are multiple racks (442) which are fixedly connected to different frames (431) in an alternating manner and mesh with the synchronization gear (441). One end of the connecting rod (443) is fixedly connected to the synchronization gear (441), and the other end protrudes out of the cover (11) and is fixedly connected to the knob (444).

10. A heat-sealing mechanism for a plastic film according to any one of claims 6 to 9, characterized in that: The feeding mechanism (4) also includes a distance sensor (45), which consists of a laser emitting end (451) and a receiving end (452). There are multiple distance sensors (45), and their laser emitting ends (451) are fixed at both ends on one side of the work frame (41). The number of receiving ends (452) is matched with the number of laser emitting ends (451), and the receiving ends (452) are fixedly connected to the frame (431). The laser emitting ends (451) and the receiving ends (452) are on the same straight line.

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