Plastic article packaging edge sealing device

Abstract

This utility model discloses a plastic product packaging edge sealing device, comprising a body, two symmetrically arranged support rods, an edge sealing assembly, and a stretching assembly. The two symmetrically arranged support rods are movably mounted on the body, the edge sealing assembly is mounted on the body, and the stretching assembly is mounted on the body. The stretching assembly includes two symmetrically arranged first clamping plates, two symmetrically arranged second clamping plates, a pressing assembly, a moving assembly, and a resetting assembly. The two symmetrically arranged first clamping plates are located on one side of the support rods, the two symmetrically arranged second clamping plates are located on one side of the support rods, the pressing assembly is located on one side of the support rods, the moving assembly is located inside the body, and the resetting assembly is located inside the support rods. Thus, within the same reciprocating stroke of the original edge sealing drive, flattening, micro-stretching, heat sealing, and resetting are completed sequentially, eliminating the need for independent stretching drives and synchronous control units on both sides.

Description

Technical Field

[0001] This utility model relates to the technical field of product packaging, and in particular to a sealing device for plastic product packaging. Background Technology

[0002] Plastic products (such as disposable cutlery, thin-walled boxes, electronic trays, PCR tubes, etc.) usually need to be repackaged immediately after injection molding or thermoforming. The role of packaging is mainly reflected in two aspects. On the sales side, highly transparent bags can directly display the product appearance, brand printing and barcodes, improve shelf appeal and meet the requirements of supermarkets and stores that "can be scanned and inspected without opening the bag". On the protection side, the bag forms an air barrier, water barrier and light barrier inside, avoiding quality problems such as scratches, discoloration and reduced strength of plastic parts due to moisture oxidation, ultraviolet radiation or mutual friction during storage and transportation.

[0003] Existing sealing devices generally use a heat-sealing knife to press the bag opening in one go. Due to the low rigidity and irregular shape of plastic products, coupled with the thinness of the packaging film, the bag opening is prone to wrinkles or partial double-layer overlap before entering the sealing area. Although such defects rarely cause sealing failure, the asymmetry of the two sides of the bag opening affects the efficiency of subsequent boxing and stacking, affects the display effect, and ultimately has a negative impact on product sales. In existing technologies, two sets of independent cylinders or servo slides are used to clamp the bag opening and pull it outward to flatten the film before the heat-sealing knife descends to complete the sealing. However, two sets of linear cylinders or servo modules, synchronous control units, and tensile force closed-loop detection need to be added in addition to the original heat-sealing drive, which increases the overall cost of the machine. Summary of the Invention

[0004] This utility model aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, the purpose of this utility model is to propose a sealing device for plastic product packaging, which sequentially completes pressing, micro-stretching, heat sealing and resetting within the same reciprocating stroke of the original sealing drive, eliminating the need for independent stretching drives and synchronous control units on both sides.

[0006] To achieve the above objectives, this utility model proposes a plastic product packaging edge sealing device, comprising a body, two symmetrically arranged support rods, an edge sealing assembly, and a stretching assembly. The two symmetrically arranged support rods are movably mounted on the body, the edge sealing assembly is mounted on the body, and the stretching assembly is mounted on the body. The stretching assembly includes two symmetrically arranged first clamping plates, two symmetrically arranged second clamping plates, a pressing assembly, a moving assembly, and a resetting assembly. The two symmetrically arranged first clamping plates are located on one side of the support rods, the two symmetrically arranged second clamping plates are located on one side of the support rods, the pressing assembly is located on one side of the support rods, the moving assembly is located within the body, and the resetting assembly is located within the support rods.

[0007] In addition, the plastic product packaging edge sealing device proposed above according to this utility model may also have the following additional technical features: Specifically, the edge sealing assembly includes a connecting block, an edge sealing mechanism, and a driving device. The connecting block is movably disposed within the body of the machine, the edge sealing mechanism is disposed on the connecting block, and the driving device is telescopic with one end connected to the connecting block and the other end connected to the body of the machine.

[0008] Specifically, the pressing assembly includes a slide rod, a pressure plate, and a pressure block. The slide rod is disposed inside the support rod, one end of the slide rod is connected to the first clamping plate, the pressure plate is disposed inside the machine body, the slide rod is movably disposed on the pressure plate, and the pressure block is disposed on the connecting block.

[0009] Specifically, the moving component includes two symmetrically arranged connecting rods, a guide groove, and two symmetrically arranged guide blocks. The two symmetrically arranged connecting rods are disposed on the support rod, the guide groove is disposed on the connecting block, and one end of the two symmetrically arranged guide blocks is disposed in the guide groove, while the other end of the guide blocks is disposed on the connecting rod.

[0010] Specifically, the reset assembly includes a first spring, a baffle, a second spring, and a limiting structure, wherein the first spring is disposed on the support rod, the baffle is disposed on the support rod, the second spring is disposed on the support rod, and the limiting structure is disposed on the slide rod.

[0011] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects: The plastic product packaging sealing device of this utility model completes all actions of "pressing, micro-stretching, heat sealing and resetting" in the same driving stroke. The pressing component first clamps the two ends of the bag opening flat, and the moving component then drives the two side clamps to move outward synchronously to eliminate wrinkles and overlaps. The sealing mechanism then completes the sealing, and the resetting component finally makes each component return to its position quickly. The whole operation process eliminates the need for additional cylinders or servo power, has a compact structure and reduced costs, and at the same time ensures that the sealing line is straight and the bag opening is symmetrical, improving the efficiency of subsequent boxing and stacking and the shelf display effect.

[0012] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0013] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 This is a schematic diagram of the structure of a plastic product packaging sealing device according to an embodiment of the present invention; Figure 2 This is a top view of a plastic product packaging sealing device according to an embodiment of the present invention; Figure 3 This invention relates to a plastic product packaging edge sealing device according to one embodiment of the present invention. Figure 3 Schematic diagram of the cross-sectional structure along line AA; Figure 4 The edge sealing device for plastic product packaging according to one embodiment of this utility model Figure 3 Schematic diagram of the cross-sectional structure of the middle BB line; Figure 5 This invention relates to a plastic product packaging edge sealing device according to one embodiment of the present invention. Figure 3 Schematic diagram of the cross-sectional structure of the middle CC line; Figure 6 This is a schematic diagram of the stretching component structure of a plastic product packaging edge sealing device according to an embodiment of the present invention; Figure 7 This is an exploded view of the stretching component structure of a plastic product packaging sealing device according to an embodiment of the present invention.

[0014] As shown in the figure: 1. Body; 2. Support rod; 3. Edge sealing assembly; 31. Connecting block; 32. Edge sealing mechanism; 4. Tensioning assembly; 41. First clamping plate; 42. Second clamping plate; 43. Pressing assembly; 431. Slide rod; 432. Pressure plate; 433. Pressure block; 44. Moving assembly; 441. Connecting rod; 442. Guide block; 45. Reset assembly; 451. First spring; 452. Second spring. Detailed Implementation

[0015] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Rather, the embodiments of the present invention include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0016] The sealing device for plastic product packaging according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0017] like Figures 1-5 As shown, the plastic product packaging edge sealing device of this utility model embodiment may include a body 1, two symmetrically arranged support rods 2, an edge sealing assembly 3, and a stretching assembly 4.

[0018] The two symmetrically arranged support rods 2 are movably mounted on the body 1.

[0019] The edge sealing component 3 is disposed on the body 1.

[0020] The stretching assembly 4 is disposed on the body 1. The stretching assembly 4 includes two symmetrically arranged first clamping plates 41, two symmetrically arranged second clamping plates 42, a pressing assembly 43, a moving assembly 44, and a resetting assembly 45. The two symmetrically arranged first clamping plates 41 are disposed on one side of the support rod 2, the two symmetrically arranged second clamping plates 42 are disposed on one side of the support rod 2, the pressing assembly 43 is disposed on one side of the support rod 2, the moving assembly 44 is disposed inside the body 1, and the resetting assembly 45 is disposed inside the support rod 2.

[0021] Specifically, body 1 is used to provide a stable support foundation for the device.

[0022] Two symmetrically arranged support rods 2 are movably installed in the connecting grooves opened at the upper end of the body 1, and the upper ends of the support rods 2 extend to the upper part of the body 1 through the connecting grooves.

[0023] The edge sealing assembly 3 is installed on the machine body 1 and is used to seal the edges of the packaging bag.

[0024] The stretching component 4 is used to slightly stretch the bag opening after clamping it to ensure flatness during sealing and to ensure its external appearance. The stretching component 4 includes two symmetrically arranged first clamping plates 41, two symmetrically arranged second clamping plates 42, a pressing component 43, a moving component 44, and a resetting component 45.

[0025] The first clamping plate 41 is mounted vertically on the upper side of the support rod 2. It is U-shaped, and the opening on the plate is used to avoid the edge sealing assembly 3.

[0026] The second clamping plate 42 is installed on one side of the support rod 2 and located below the first clamping plate 41. The second clamping plate 42 can be fixedly connected to the support rod 2 by bolts or welding. By opening a storage groove on the machine body 1 and installing the second clamping plate 42 inside the storage groove, the flatness of the operating surface of the machine body 1 is ensured. Its shape is U-shaped, and the opening on the plate is used to avoid the edge sealing assembly 3.

[0027] In this embodiment, the lengths of the first clamping plate 41 and the second clamping plate 42 are both adjustable. By adjusting the lengths of the first clamping plate 41 and the second clamping plate 42, the edges of different types of packaging openings can be sealed.

[0028] The pressing component 43 is used to synchronously drive the first clamping plate 41 downward when the sealing component 3 moves, and clamp the two sides of the bag opening in cooperation with the second clamping plate 42.

[0029] The moving component 44 is used to simultaneously pull the two clamping parts of the bag opening outward after the pressing component 43 clamps the bag opening, so that the bag opening is sealed in a completely flat state, thereby eliminating wrinkles and overlaps.

[0030] The reset component 45 is used to reset the first clamping plate 41 after the edge sealing action is completed.

[0031] It should be noted that after the packaging bag is placed on the device, the sealing assembly 3 is activated. The sealing assembly 3 moves the pressing assembly 43 to move the first clamping plate 41 downward. With the cooperation of the first clamping plate 41 and the second clamping plate 42, the two ends of the bag opening are clamped and fixed. Then, when the pressing assembly 43 moves the first clamping plate 41 and the second clamping plate 42 to fit together, the moving assembly 44 moves the support rod 2 away from each other, so that the bag opening is completely flattened. At this time, the sealing assembly 3 moves to the end and seals the packaging. After sealing, when the sealing assembly 3 resets, the moving assembly 44 drives the support rod 2 to reset. At this time, the reset assembly 45 drives the first clamping plate 41 to reset upward. After resetting, the clamping of the packaging bag is released.

[0032] In one embodiment of this utility model, such as Figure 4 As shown, the edge sealing assembly 3 may include a connecting block 31, an edge sealing mechanism 32, and a driving device. The connecting block 31 is movably disposed within the body 1, the edge sealing mechanism 32 is disposed on the connecting block 31, the driving device is telescopic and one end is connected to the connecting block 31, and the other end of the driving device is connected to the body 1.

[0033] Specifically, the connecting block 31 is installed inside the body 1 and can move up and down. Its upper end extends to the upper part of the body 1 to drive the edge sealing mechanism 32 to move up and down.

[0034] The sealing mechanism 32 is installed on the connecting block 31. The sealing mechanism 32 moves up and down through the drive of the connecting block 31, and the sealing mechanism 32 seals the packaging bag.

[0035] In this embodiment, the sealing mechanism 32 is detachably mounted on the connecting block 31. It can be any sealing module such as an electric heating heat sealing knife, a pulse heat sealing knife, or an ultrasonic sealing mold. The sealing module can be quickly installed according to the bag material and speed requirements without modifying other components.

[0036] The drive unit is installed inside the body 1 and is used to control the up and down movement of the connecting block 31 to synchronously drive the edge sealing mechanism 32 to move.

[0037] In this embodiment, the driving device can be any one or more combinations of a single-acting cylinder, a double-acting cylinder, a servo electric cylinder, and a cam-connecting rod combination, which can control the connecting block 31 to move up and down. The operator needs to select one of these devices to connect to the connecting block 31 according to the on-site air source, speed, and control accuracy requirements.

[0038] It should be noted that when the packaging bag is placed on the upper part of the machine body 1, the connecting block 31 is slid by the drive device, and the connecting block 31 drives the sealing mechanism 32 to move downward to seal the edge of the bag.

[0039] In one embodiment of this utility model, such as Figure 6 As shown, the pressing assembly 43 includes a slide rod 431, a pressure plate 432, and a pressure block 433. The slide rod 431 is disposed inside the support rod 2, and one end of the slide rod 431 is connected to the first clamping plate 41. The pressure plate 432 is disposed inside the machine body 1, and the slide rod 431 is movably disposed on the pressure plate 432. The pressure block 433 is disposed on the connecting block 31.

[0040] Specifically, the slide bar 431 is movably installed in the groove inside the support rod 2. Its upper end is fixedly connected to the first clamping plate 41 by welding. When the pressure block 433 presses down on the slide bar 431, the slide bar 431 slides straight down along the groove, causing the first clamping plate 41 to move down synchronously and fit with the second clamping plate 42 to complete the bag opening clamping.

[0041] The pressure plate 432 is installed inside the machine body 1. The pressure plate 432 is movably installed in the slide groove opened inside the slide rod 431. The pressure plate 432 drives the slide rod 431 to slide up and down, thereby driving the first clamping plate 41 to move up and down.

[0042] The pressure block 433 is installed inside the machine body 1. The pressure block 433 can be fixedly installed on the connecting block 31 by bolts. The pressure block 433 is attached to the upper end of the pressure plate 432. When the connecting block 31 moves downward, the pressure block 433 first presses against the pressure plate 432, so that the pressure plate 432 drives the slide rod 431 and the first clamping plate 41 to move downward synchronously. When the first clamping plate 41 and the second clamping plate 42 close, the bag opening is clamped. Then the connecting block 31 continues to move downward to enter the micro-stretching and heat sealing stage.

[0043] In this embodiment, several roller sets can be installed on both sides of the lower end of the pressure block 433 where it contacts the pressure plate 432. When the pressure block 433 moves downward, the roller sets transmit vertical pressure to the pressure plate 432. Since there is no relative lateral displacement between the two, the roller sets transmit pressure to the pressure plate 432. When the pressure plate 432 drives the slide rod 431 and the first clamping plate 41 to slide downward, the bag opening is pressed and fixed by the first clamping plate 41 and the second clamping plate 42. Then, the moving component 44 drives the support rod 2, the first clamping plate 41 and the second clamping plate 42 to move laterally for micro-stretching. The roller sets roll on the surface of the pressure plate 432, which significantly reduces the sliding friction caused by lateral misalignment and improves the accuracy of the micro-stretching stroke and the reliability of the mechanism.

[0044] It should be noted that when the connecting block 31 moves downward, the pressure block 433 first presses against the pressure plate 432, causing the pressure plate 432 to drive the slide rod 431 and the first clamping plate 41 to move downward synchronously. When the first clamping plate 41 and the second clamping plate 42 close, the bag opening is clamped. Then the connecting block 31 continues to move downward and enters the micro-stretching and heat sealing stage.

[0045] In one embodiment of this utility model, such as Figure 6 As shown, the moving component 44 may include two symmetrically arranged connecting rods 441, a guide groove, and two symmetrically arranged guide blocks 442. The two symmetrically arranged connecting rods 441 are disposed on the support rod 2, the guide groove is disposed on the connecting block 31, one end of the two symmetrically arranged guide blocks 442 is disposed in the guide groove, and the other end of the guide blocks 442 is disposed on the connecting rods 441.

[0046] Specifically, two symmetrically arranged connecting rods 441 are mounted on the support rod 2.

[0047] Two symmetrical guide grooves are provided on the side of the connecting block 31 near the connecting rod 441. The lower section of the guide groove is vertical, and the upper section is inclined and offset to the outside. During the clamping stage, the guide block 442 is located in the vertical section, and the support rod 2 can only move up and down. After clamping is completed, the connecting block 31 continues to move down, and the guide block 442 enters the inclined section and is forced to slide along the outer inclined groove. Thus, the connecting rod 441 pulls the two support rods 2 on both sides to open outwards synchronously, achieving micro-stretching.

[0048] Two symmetrically arranged guide blocks 442 are installed at one end in the corresponding guide groove and at the other end in the connecting rod 441. When the guide groove transitions from a vertical section to an inclined section, the guide blocks 442 slide laterally in the guide groove and transmit the force of the lateral movement to the support rod 2 through the connecting rod 441, which drives the first clamping plate 41 and the second clamping plate 42, which have been clamped, to move away from each other and complete the micro-stretching.

[0049] It should be noted that during the clamping stage, the guide block 442 is located in the vertical section, and the support rod 2 can only move up and down. After clamping is completed, the connecting block 31 continues to descend, and the guide block 442 enters the inclined section. The guide block 442 slides laterally in the guide groove and transmits the force of the lateral movement to the support rod 2 through the connecting rod 441, which drives the first clamping plate 41 and the second clamping plate 42, which have completed clamping, to move away from each other and complete the micro-stretching.

[0050] In one embodiment of this utility model, such as Figure 7 As shown, the reset assembly 45 may include a first spring 451, a baffle, a second spring 452, and a limiting structure, wherein the first spring 451 is disposed on the support rod 2, the baffle is disposed on the support rod 2, the second spring 452 is disposed on the support rod 2, and the limiting structure is disposed on the slide rod 431.

[0051] Specifically, the first spring 451 is installed on the lower end face of the first clamping plate 41. A storage groove is opened inside the support rod 2 to store the first spring 451 when it contracts to prevent interference with the movement of the first clamping plate 41. The first spring 451 is installed in this storage groove. When the pressure is released, the first spring 451 is reset by the elastic force of the first spring 451.

[0052] The baffle can be fixed to the lower end of the slide bar 431 by bolts or welding, and is used to support and limit the bottom of the second spring 452.

[0053] The second spring 452 is sleeved on the outside of the slide bar 431, with its lower end abutting against the baffle and its upper end abutting against the lower surface of the pressure plate 432.

[0054] In this embodiment, the elastic force of the second spring 452 is greater than that of the first spring 451.

[0055] A limiting structure is installed on the slide bar 431 to limit the movable distance of the pressure plate 432.

[0056] In this embodiment, the limiting structure consists of a limiting groove on the outer wall of the slide rod 431 and a limiting block fixed on the pressure plate 432. The limiting block is always embedded in the limiting groove, thereby limiting the sliding stroke of the pressure plate 432 relative to the slide rod 431. Its operation process is as follows: Clamping stage: The pressure block 433 begins to descend with the connecting block 31. Its bottom surface first contacts the top of the pressure plate 432. The initial preload of the second spring 452 is greater than that of the first spring 451. Therefore, the pressure plate 432 transmits the downward force to the baffle and the slide rod 431 through the second spring 452. The first spring 451 is compressed, and the slide rod 431 moves down synchronously with the first clamping plate 41. The first clamping plate 41 is kept under the downward pressure by the elastic force of the second spring 452. When the first clamping plate 41 and the second clamping plate 42 are in contact, the bag opening is flattened and clamped. At this time, the pressure block 433 continues to descend, and the second spring 452 no longer continues to compress. The clamping force remains constant.

[0057] In the yielding stage: the bag opening is already clamped, and the connecting block 31 still needs to move downward to complete the micro-stretching and heat sealing. The pressure block 433 continues to press down on the pressure plate 432. Since the first clamping plate 41 is blocked by the second clamping plate 42 and cannot move further downward, the pressure plate 432 can only slide downward relative to the slide bar 431. The second spring 452 begins to be compressed. The sliding stroke of the pressure plate 432 relative to the slide bar 431 is the additional downward space required by the connecting block 31, ensuring that the sealing mechanism 32 reaches the heat sealing position. At the same time, the guide block 442 slides to the outward tilting offset part of the guide groove. Through the guide block 442, the support rod 2, the first clamping plate 41 and the second clamping plate 42 move away from each other laterally, realizing the micro-stretching of the bag opening.

[0058] Reset Phase: After heat sealing, connecting block 31 moves upward, second spring 452 releases first, pressure plate 432 slides upward relative to slide rod 431. When the limiting block reaches the upper end of the limiting groove, pressure plate 432 is locked and no longer moves relative to slide rod 431. Connecting block 31 continues to move upward, first spring 451 begins to release, first spring 451 pushes first clamping plate 41 at the upper end of first spring 451, first clamping plate 41 drives slide rod 431 to move upward synchronously, first clamping plate 41 and second clamping plate 42 separate at this time, bag opening is released, device returns to initial position, waiting for the next cycle.

[0059] In summary, the plastic product packaging sealing device of this utility model completes all actions of "pressing, micro-stretching, heat sealing, and resetting" in sequence within the same drive stroke. The pressing component first clamps the two ends of the bag opening flat, and the moving component then drives the two side clamps to move outward synchronously to eliminate wrinkles and overlaps. The sealing mechanism then completes the sealing, and the resetting component finally makes each component return to its position quickly. The entire operation process eliminates the need for additional cylinders or servo power, has a compact structure, reduces costs, and at the same time ensures straight sealing lines and symmetrical bag openings, improving the efficiency of subsequent boxing and stacking, as well as the shelf display effect.

[0060] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A plastic article packaging edge sealing apparatus characterized by, It includes the body, two symmetrically arranged support rods, edge sealing assembly, and tensioning assembly, among which, The two symmetrically arranged support rods are movably mounted on the body; The edge-sealing assembly is disposed on the body; The stretching assembly is disposed on the machine body, and the stretching assembly includes two symmetrically arranged first clamping plates, two symmetrically arranged second clamping plates, a pressing assembly, a moving assembly, and a resetting assembly, wherein... Two symmetrically arranged first clamping plates are disposed on one side of the support rod; Two symmetrically arranged second clamping plates are disposed on one side of the support rod; The pressing component is disposed on one side of the support rod; The mobile component is disposed within the body; The reset component is disposed within the support rod.

2. The plastic product packaging sealing device according to claim 1, characterized in that, The edge-sealing assembly includes a connecting block, an edge-sealing mechanism, and a driving device, wherein... The connecting block is movably disposed within the body of the machine; The edge sealing mechanism is disposed on the connecting block; The drive device is retractable, with one end connected to the connecting block and the other end connected to the machine body.

3. The plastic article packaging edge sealing apparatus according to claim 2, wherein The pressing assembly includes a slide bar, a pressure plate, and a pressure block, wherein... The slide bar is disposed inside the support rod, and one end of the slide bar is connected to the first clamping plate; The pressure plate is disposed inside the machine body, and the slide rod is movably disposed on the pressure plate; The pressure block is disposed on the connecting block.

4. The plastic product packaging sealing device according to claim 3, characterized in that, The moving component includes two symmetrically arranged connecting rods, a guide groove, and two symmetrically arranged guide blocks, wherein... Two symmetrically arranged connecting rods are mounted on the support rod; The guide groove is disposed on the connecting block; Two symmetrically arranged guide blocks are positioned with one end in the guide groove and the other end on the connecting rod.

5. The plastic article packaging edge sealing apparatus according to claim 3, wherein The reset assembly includes a first spring, a baffle, a second spring, and a limiting structure, wherein, The first spring is mounted on the support rod; The baffle is disposed on the support rod; The second spring is disposed on the support rod; The limiting structure is provided on the slide bar.

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