Automatic sealing device for plastic bags

Abstract

The utility model belongs to the technical field of plastic bag processing equipment, and particularly relates to an automatic sealing device for a plastic bag, which comprises a supporting table, a heating mechanism and a compacting mechanism, and the accurate heating and compacting of the edge of the plastic bag are realized by reasonably designing the layout and the structure of each part. One end of the supporting table is provided with a reel support used for containing a plastic bag to be sealed, and the other end of the supporting table is provided with a rolling support. The heating mechanism can uniformly heat the edge of the plastic bag through the combined design of a heating block and a heating plate, so that the plastic bag reaches a molten state; the compacting mechanism ensures that the edge of the heated plastic bag is uniformly compacted through the cooperative work of the driving assembly and the edge pressing mechanism, and a firm seal is formed. According to the device, through an automatic transmission and positioning system, the plastic bag keeps stable movement and accurate positioning in the sealing process, so that the sealing quality and the production efficiency are improved, manual intervention is reduced, and the device is suitable for large-scale industrial production.

Description

TECHNICAL FIELD

[0001] The utility model belongs to plastic bag processing equipment technical field, concretely relates to a plastic bag automatic sealing device. BACKGROUND

[0002] As a common packaging material, plastic bags are widely used in food, medicine, chemical industry, daily necessities and other fields. In the production and use process of plastic bags, sealing is a crucial step, which directly affects the sealing and safety of the product. At present, the sealing methods of plastic bags on the market mainly include manual sealing and semi-automatic sealing. However, these traditional sealing methods have the problems of low operation efficiency, unstable sealing effect, high labor cost, etc., which are difficult to meet the needs of large-scale industrial production.

[0003] Manual sealing method usually requires workers to manually operate the sealing machine, and the edge of the plastic bag is put into the sealing device by artificial, and the sealing is completed through heating and compaction process. Although the equipment cost of this method is low, it has the disadvantages of low production efficiency, large manual operation error and high labor intensity, which is difficult to meet the efficient production requirements of modern factory. In addition, the heating and compaction process of manual sealing is easily affected by human factors, resulting in uneven sealing effect, and even quality problems such as air leakage and water leakage.

[0004] Semi-automatic sealing method improves the shortcomings of manual sealing to a certain extent, and realizes partial automation of heating and compaction through mechanical device. However, the automation degree of this kind of device is limited, and the operator still needs to manually place the plastic bag and take it out after sealing, which still has the problems of low efficiency and high labor participation. At the same time, the existing semi-automatic sealing device often causes uneven heat conduction or insufficient compaction in the sealing process, resulting in uneven edge of the sealing part of the plastic bag and insufficient sealing strength, which affects the overall quality of the product. TECHNICAL SOLUTION

[0005] In view of the problems existing in the prior art, the purpose of the utility model is to provide a plastic bag automatic sealing device, which can realize uniform heating and compaction of the edge of the plastic bag sealing through the innovative design of heating mechanism and compaction mechanism, and ensure the stable movement of the plastic bag in the sealing process through the accurate design of transmission and positioning system, so as to realize efficient and stable automatic sealing operation.

[0006] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0007] A plastic bag automatic sealing device, comprising a support table, a second spool support and a first spool support are arranged on one end side and above the support table respectively;

[0008] The first reel support and the second reel support are used for placing plastic bags to be sealed;

[0009] The other end of the support table is provided with a third reel support for winding the plastic bags after sealing;

[0010] The top of the support table is provided with a heating mechanism and a compaction mechanism;

[0011] The heating mechanism is used for heating the plastic to be sealed;

[0012] The compaction mechanism is used for compacting the plastic bag after heating, so that the plastic bag after heating is bonded together.

[0013] Further, the heating mechanism comprises a crossbeam fixed on the top of the support table, and mirror image heating blocks are arranged on the top of the crossbeam, and the heating blocks are used for heating the plastic cloth.

[0014] Further, support legs are fixedly connected to both ends of the crossbeam, and a limiting slot is formed in the length direction of the top of the crossbeam;

[0015] The heating blocks are located in the limiting slot.

[0016] Further, a heating plate is fixedly connected to one side of the heating block, and the heating plate is inserted between the two plastic cloths;

[0017] The other side of the heating block is provided with a heating bin, and an electric heating ring for heating is arranged in the heating bin.

[0018] Further, threaded columns are fixedly connected above both ends of the crossbeam, and a lower pressing plate is connected to the threaded columns, and the bottom of the lower pressing plate is connected to the top of the heating block;

[0019] Positioning holes are formed above both ends of the lower pressing plate, and the threaded columns pass through the positioning holes;

[0020] Locking caps are arranged above both ends of the lower pressing plate, and the locking caps are connected to the threaded columns.

[0021] Further, the compaction mechanism comprises a driving assembly and an edge pressing mechanism;

[0022] The edge pressing mechanism is arranged on both sides of the driving assembly;

[0023] The driving assembly is used for driving the plastic cloth to be sealed to move;

[0024] The edge pressing mechanism is used for compacting the edge of the plastic cloth after heating.

[0025] Further, the driving assembly comprises a first bottom plate connected to the top of the support table, first roller shaft seats are connected above both ends of the first bottom plate, and a driving roller and a driven roller are rotatably connected between the two first roller shaft seats;

[0026] One end of the driving roller is provided with a first motor for driving rotation thereof;

[0027] One end of the driving roller is provided with a first gear;

[0028] One end of the driven roller is provided with a second gear;

[0029] The first gear is engaged with the second gear;

[0030] During the sealing process of the plastic bag, the edges of the plastic cloth on the first reel support and the second reel support are aligned and pass through the driving roller and the driven roller.

[0031] Further, the edge pressing mechanism comprises a second bottom plate connected to the top of the support table, second roller shaft seats are arranged above both ends of the second bottom plate, and a first linkage column and a second linkage column are rotatably connected between the two second roller shaft seats;

[0032] One end of the first linkage column is provided with a third gear, one end of the second linkage column is provided with a fourth gear, and the third gear is engaged with the fourth gear.

[0033] Further, a first pressing disc is mirror-suitably arranged on the first linkage column;

[0034] A second pressing disc is mirror-suitably arranged on the second linkage column;

[0035] The first pressing disc is attached to the second pressing disc;

[0036] During the sealing process of the plastic bag, the edges of the plastic cloth after heating pass between the first pressing disc and the second pressing disc.

[0037] Further, a deflection roller is arranged on the inner side of the first reel support;

[0038] A second motor is arranged on the outer side of the third reel support.

[0039] Compared with the prior art, the present application has the following beneficial effects:

[0040] Firstly, the utility model discloses a heating mechanism and compaction mechanism are set up, realized accurate heating and compaction to the edge of plastic bag. Heating mechanism adopts the combination design of heating block and heating plate, and the electric heating ring in the heating block can rapidly heat, and the heat is evenly transferred to the heating plate through the efficient heat conduction structure. The heating plate is inserted between two plastic cloths, and the edge of the plastic cloth is uniformly heated, so that the plastic at the sealing place can be fully fused. The uniformity and accuracy of heating significantly improve the quality of sealing, avoid the situation that the sealing is not firm or leaks due to uneven temperature, and ensure the sealing property and safety of the product.

[0041] Secondly, the compaction mechanism of the utility model ensures that the plastic bag can move stably and be uniformly compacted during sealing through reasonable mechanical transmission design. The driving assembly includes a driving roller and a driven roller, and synchronous rotation is realized through first motor driving and gear meshing transmission, so that the plastic bag can pass through the heating and compacting area stably during sealing. The edge compaction mechanism is designed by the combination of linkage column and pressure plate, and the edge of the heated plastic bag is uniformly compacted to ensure the tightness and aesthetics of the sealing. This design effectively avoids the poor sealing caused by unstable movement or uneven compaction of the plastic bag, and improves the quality and consistency of the sealing.

[0042] In addition, the utility model is carefully designed through the transmission and positioning system, so that the plastic bag can be stably and accurately positioned during sealing. Through the reasonable arrangement of the first spool support, the second spool support and the third spool support, it is ensured that the whole process from placing to sealing to winding of the plastic bag can be smoothly carried out. The setting of the direction changing roller effectively adjusts the conveying direction of the plastic bag, ensuring that the plastic bag can smoothly enter each working area; the cooperation of the third spool support further improves the neatness and stability of the plastic bag winding. These design schemes improve the automation degree of the equipment, reduce manual intervention, and improve the production efficiency and production quality.

[0043] Finally, the utility model solves the problems of low automation degree and manual participation of the traditional sealing device, realizes the whole automatic operation of the plastic bag from placing, sealing to winding through the automatic design and efficient mechanical transmission system, and reduces the complexity and labor intensity of manual operation. The overall device structure is simple and compact, easy to operate, effectively reduces the production cost and equipment maintenance cost, and improves the economy and practicability of the device. Through these improvements, the utility model significantly improves the automation level and quality stability of the plastic bag sealing, and provides a more reliable and efficient solution for large-scale industrial production. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 It is the structure schematic view of the utility model;

[0045] Figure 2 This is a schematic diagram of the heating mechanism of this utility model;

[0046] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0047] Figure 4 This is a schematic diagram of the structure of the heating block of this utility model;

[0048] Figure 5 This is a schematic diagram of the compaction mechanism of this utility model;

[0049] Figure 6 This is a schematic diagram of the disassembled structure of the compaction mechanism of this utility model;

[0050] Figure 7 This is a schematic diagram of the structure of the drive component of this utility model;

[0051] Figure 8 This is a schematic diagram of the pressing mechanism of this utility model.

[0052] The attached diagram lists the components represented by each number as follows:

[0053] 1. Support platform;

[0054] 2. First reel support; 21. Directional roller;

[0055] 3. Second reel support;

[0056] 4. Heating mechanism;

[0057] 41. Crossbeam; 411. Limiting groove; 412. Support leg; 413. Threaded column;

[0058] 42. Heating block; 421. Heating plate; 422. Heating chamber; 423. Heating coil;

[0059] 43. Lower pressure plate; 431. Positioning hole;

[0060] 44. Locking cap;

[0061] 5. Compaction mechanism;

[0062] 51. Driver components;

[0063] 511. First base plate; 512. First roller bearing seat; 513. Drive roller; 5131. First gear; 514. Driven roller; 5141. Second gear; 515. First motor;

[0064] 52. Edge pressing mechanism;

[0065] 521. Second base plate; 522. Second roller bearing seat; 523. First linkage column; 5231. First pressure plate; 5232. Third gear; 524. Second linkage column; 5241. Second pressure plate; 5242. Fourth gear;

[0066] 6. Third reel support; 61. Second motor. Detailed Implementation

[0067] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0068] See Figures 1-8 An automatic sealing device for plastic bags includes a support platform 1. A second roller bracket 3 and a first roller bracket 2 are respectively provided on one side and top of the support platform 1. The first roller bracket 2 and the second roller bracket 3 are used to hold the plastic bags to be sealed. The plastic bags enter the sealing device and are sealed through various mechanisms within the device. A third roller bracket 6 is provided at the other end of the support platform 1. The third roller bracket 6 is used to roll up the sealed plastic bags. The third roller bracket 6 ensures that the sealed plastic bags can be neatly rolled up and stored for easy subsequent transportation and use. A heating mechanism 4 and a compaction mechanism 5 are provided on the top of the support platform 1. The heating mechanism 4 heats the plastic bags to be sealed, bringing the edges of the plastic bags to a suitable temperature for effective sealing. The compaction mechanism 5 compacts the heated plastic bags, causing them to stick together and ensuring a tight and aesthetically pleasing seal.

[0069] See Figures 2-4 The heating mechanism 4 includes a crossbeam 41 fixed to the top of the support platform 1. A heating block 42 is mirror-mounted on the top of the crossbeam 41. The heating block 42 is used to heat the plastic sheet. The structure of the crossbeam 41 ensures the stable installation of the heating block 42 and provides precise positioning, so that the heating block 42 can evenly heat the plastic sheet it passes through.

[0070] See Figures 2-4 Both ends of the crossbeam 41 are fixedly connected to support legs 412, which provide necessary support and stability for the crossbeam 41; and the top of the crossbeam 41 is provided with a limiting groove 411 along its length; the limiting groove 411 is used to ensure that the movement range of the heating block 42 is controlled and to prevent the heating block 42 from deviating during use. The heating block 42 is located in the limiting groove 411, so that it can accurately heat the plastic cloth when working.

[0071] See Figures 2-4A heating plate 421 is fixedly connected to one side of the heating block 42, and the heating plate 421 is inserted between two plastic sheets. The insertion design of the heating plate 421 ensures the accuracy of heating, so that the plastic sheets can be heated evenly when passing through. A heating chamber 422 is provided on the other side of the heating block 42, and an electric heating coil 423 is set inside the heating chamber 422 for heating. The electric heating coil 423 generates heat through the action of electric current. The structural design of the heating chamber 422 ensures effective heat transfer and heat preservation, so that the plastic sheets can be quickly heated to a suitable temperature in a short time.

[0072] See Figure 3 Threaded posts 413 are fixedly connected to both ends of the crossbeam 41, and lower pressure plates 43 are connected to the threaded posts 413. The bottom of the lower pressure plate 43 is in contact with the top of the heating block 42. The lower pressure plate 43 is designed to provide additional pressure to the heating block 42 during heating, making the plastic cloth adhere more tightly when heated. Positioning holes 431 are provided through both ends of the lower pressure plate 43, and the threaded posts 413 pass through the positioning holes 431. The presence of positioning holes 431 ensures the stability of the lower pressure plate 43 during use. Locking caps 44 are provided at both ends of the lower pressure plate 43, and the locking caps 44 are connected to the threaded posts 413. The locking caps 44 provide additional fixing and prevent the lower pressure plate 43 from shifting during operation.

[0073] See Figures 3-4 The compaction mechanism 5 includes a drive assembly 51 and an edge-pressing mechanism 52. The drive assembly 51 and the edge-pressing mechanism 52 work together to compact the plastic sheet, ensuring a tight and aesthetically pleasing seal. The edge-pressing mechanism 52 is located on both sides of the drive assembly 51; this layout ensures that the plastic sheet is evenly stressed during movement. The drive assembly 51 drives the plastic sheet to be sealed, allowing it to pass smoothly through the heating and compaction areas. The edge-pressing mechanism 52 compacts the edges of the heated plastic sheet; the compacted edges adhere tightly, significantly improving the sealing effect.

[0074] See Figures 5-8The drive assembly 51 includes a first base plate 511 connected to the top of the support platform 1. First roller bearing seats 512 are connected to both ends of the first base plate 511. A drive roller 513 and a driven roller 514 are rotatably connected between the two first roller bearing seats 512. The drive roller 513 and the driven roller 514 work together to move the plastic bag smoothly through rotational motion. A first motor 515 is provided at one end of the drive roller 513 to drive its rotation; the first motor 515 provides strong power support, ensuring the stable operation of the drive roller 513. A first gear 5131 is provided at one end of the drive roller 513; a second gear 5141 is provided at one end of the driven roller 514. The first gear 5131 and the second gear 5141 mesh; the meshing design between the gears ensures the synchronous operation of the drive roller 513 and the driven roller 514, thereby allowing the plastic bag to move smoothly during the sealing process and avoiding poor sealing due to speed differences.

[0075] See Figure 7 The edge-pressing mechanism 52 includes a second base plate 521 connected to the top of the support platform 1. Second roller bearings 522 are provided above both ends of the second base plate 521. A first linkage column 523 and a second linkage column 524 are rotatably connected between the two second roller bearings 522. The synchronous operation design of the first linkage column 523 and the second linkage column 524 ensures uniform force on the plastic sheet during the pressing process, avoiding sealing misalignment and unevenness. A third gear 5232 is provided at one end of the first linkage column 523, and a fourth gear 5242 is provided at one end of the second linkage column 524. The third gear 5232 and the fourth gear 5242 mesh with each other. This gear meshing structure further ensures the synchronous rotation of the linkage columns, ensuring the effective pressing of the plastic sheet edges.

[0076] See Figure 8 A first pressure plate 5231 is mirror-mounted on the first linkage column 523; the first pressure plate 5231 is used to compact the upper side of the edge of the plastic sheet. A second pressure plate 5241 is mirror-mounted on the second linkage column 524; the second pressure plate 5241 is used to compact the lower side of the edge of the plastic sheet. The first pressure plate 5231 and the second pressure plate 5241 are in close contact; this design ensures the tightness and strength of the plastic bag seal. During the sealing process, the heated edge of the plastic sheet passes between the first pressure plate 5231 and the second pressure plate 5241; through the combined action of the first pressure plate 5231 and the second pressure plate 5241, the plastic bag seal achieves an ideal tightness and firmness.

[0077] See Figure 1A reversing roller 21 is provided on the inner side of the first roll support 2; the function of the reversing roller 21 is to change the conveying direction of the plastic bag so that it can smoothly enter the next process. A second motor 61 is provided on the outer side of the third roll support 6; the second motor 61 is used to drive the winding mechanism on the third roll support 6 so that the sealed plastic bag can be wound up in an orderly manner.

[0078] The working principle of this utility model is as follows:

[0079] When in use, place the plastic roll to be sealed onto the first roll support 2 and the second roll support 3, and then pass the plastic roll placed on the first roll support 2 and the second roll support 3 through the heating mechanism 4 and the compaction mechanism 5 in sequence.

[0080] When passing through the heating mechanism 4, it should pass between the lower pressure plate 43 and the crossbeam 41, and the heating plate 421 on the side of the heating block 42 should be positioned between the two plastic sheets, so that the heating plate 421 can heat the edge of the plastic sheet that it passes through.

[0081] The working process of heating block 42 is as follows:

[0082] The heating block 42 is fixedly mounted on the crossbeam 41 at the top of the support platform 1. The connection between the heating block 42 and the bracket structure ensures its stability during use. A heating chamber 422 is located in the center of the heating block 42. The heating chamber 422 is a hollow space used to house and fix the heating coil 423. The heating coil 423 has a ring-shaped structure and is evenly distributed along the inner wall of the heating chamber 422. The heating coil 423 is made of a highly conductive material, enabling it to generate heat rapidly. When current passes through the heating coil 423, resistance heat is generated inside the heating coil 423, causing the entire heating chamber 422 to heat up rapidly.

[0083] The heating chamber 422 is designed for efficient heat conduction. Its inner wall is made of a highly thermally conductive metal material, which can quickly and evenly transfer the heat generated by the heating coil 423 to the outer surface of the heating block 42. A heating plate 421 is installed on the outside of the heating block 42, extending outward from one side of the heating block 42 and inserted between two plastic sheets to be sealed. The surface of the heating plate 421 is specially treated, possessing high thermal conductivity and corrosion resistance, enabling it to operate stably for a long time in high-temperature environments.

[0084] When the plastic bag enters the sealing device, the heating plate 421 is positioned between two plastic sheets and close to their edges. After the heating coil 423 operates, the generated heat is rapidly transferred to the heating plate 421 through the heating chamber 422, causing the temperature of the heating plate 421 to rise rapidly. Because the heating plate 421 is in direct contact with the edge of the plastic bag, this heat can be quickly transferred to the edge portion of the plastic bag. The temperature of the edge of the plastic bag rises rapidly as the temperature of the heating plate 421 increases, reaching the melting temperature range of the plastic material.

[0085] At this temperature, the edges of the plastic bag begin to soften and gradually melt. Since the heating plate 421 is inserted between the two plastic sheets, its heating surfaces on both sides can simultaneously and evenly heat the inner sides of both plastic sheets, ensuring that the edges of the two plastic sheets melt at the same temperature. This uniform heating method avoids the problems of weak or uneven sealing caused by uneven heat distribution in traditional heating methods.

[0086] Meanwhile, a lower pressure plate 43 is provided below the heating block 42. During the heating process, the lower pressure plate 43 applies downward pressure through the action of the threaded post 413 and the locking cap 44, making the edge of the plastic sheet more tightly contact the heating plate 421. This not only ensures the uniformity of heating, but also reduces heat loss and improves heating efficiency by applying appropriate pressure. During the sealing process of the plastic bag, as the heating coil 423 continues to work, the heating block 42 can maintain a stable high temperature, ensuring that the edge of the plastic bag can achieve the best melting effect when passing through the heating mechanism 4, providing ideal conditions for the subsequent compaction process.

[0087] After the heating process is complete, the edges of the plastic bag, still molten, enter the compaction mechanism 5. Under the combined action of the first pressure plate 5231 and the second pressure plate 5241, the edges of the plastic bag are tightly pressed together, thus forming a firm seal. Through this design, the heating block 42 achieves efficient and stable heating, improving the working efficiency and sealing quality of the automatic plastic bag sealing device.

[0088] When passing through the compaction mechanism 5, it should pass between the first linkage column 523 and the second linkage column 524, and the first pressure plate 5231 sleeved on the first linkage column 523 and the second pressure plate 5241 sleeved on the second linkage column 524 should compact the edge of the heated plastic bag.

[0089] The first motor 515 drives the drive roller 513 to rotate, and with the cooperation of the first gear 5131 and the second gear 5141, it drives the driven roller 514 to move synchronously with the drive roller 513. With the rotation of the drive roller 513 and the driven roller 514, the plastic bag moves smoothly during the sealing process.

[0090] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. An automatic sealing device for plastic bags, comprising a support platform (1), characterized in that: The support platform (1) is provided with a second roller bracket (3) and a first roller bracket (2) on one side and above respectively. The first roll support (2) and the second roll support (3) are used to hold plastic bags to be sealed; The other end of the support platform (1) is provided with a third roll bracket (6), which is used to roll up the sealed plastic bag. The top of the support platform (1) is provided with a heating mechanism (4) and a compaction mechanism (5). The heating mechanism (4) is used to heat the plastic to be sealed; The compaction mechanism (5) is used to compact the heated plastic bags so that the heated plastic bags stick together.

2. The automatic sealing device for plastic bags according to claim 1, characterized in that: The heating mechanism (4) includes a crossbeam (41) fixed to the top of the support platform (1), and a heating block (42) is provided on the top of the crossbeam (41) in a mirror image. The heating block (42) is used to heat the plastic sheet.

3. The automatic sealing device for plastic bags according to claim 2, characterized in that: Both ends of the crossbeam (41) are fixedly connected to support legs (412), and the top of the crossbeam (41) is provided with a limiting groove (411) along its length. The heating block (42) is located in the limiting groove (411).

4. The automatic sealing device for plastic bags according to claim 3, characterized in that: A heating plate (421) is fixedly connected to one side of the heating block (42), and the heating plate (421) is inserted between two plastic sheets; A heating chamber (422) is provided on the other side of the heating block (42), and an electric heating coil (423) for heating is provided inside the heating chamber (422).

5. The automatic sealing device for plastic bags according to claim 4, characterized in that: Both ends of the crossbeam (41) are fixedly connected to threaded columns (413), and a lower pressure plate (43) is connected to the threaded column (413). The bottom of the lower pressure plate (43) is connected to the top of the heating block (42). The lower pressure plate (43) has positioning holes (431) through both ends above, and the threaded post (413) passes through the positioning holes (431); Locking caps (44) are provided above both ends of the lower pressure plate (43), and the locking caps (44) are connected to the threaded post (413).

6. The automatic sealing device for plastic bags according to claim 1, characterized in that: The compaction mechanism (5) includes a drive assembly (51) and a pressing mechanism (52); The pressing mechanism (52) is distributed on both sides of the driving assembly (51); The drive assembly (51) is used to drive the plastic sheet to be sealed to move; The edge pressing mechanism (52) is used to press the edge of the heated plastic sheet.

7. The automatic sealing device for plastic bags according to claim 6, characterized in that: The drive assembly (51) includes a first base plate (511) connected to the top of the support platform (1). A first roller bearing seat (512) is connected above both ends of the first base plate (511). A drive roller (513) and a driven roller (514) are rotatably connected between the two first roller bearing seats (512). One end of the drive roller (513) is provided with a first motor (515) for driving its rotation. A first gear (5131) is provided at one end of the drive roller (513). A second gear (5141) is provided at one end of the driven roller (514). The first gear (5131) meshes with the second gear (5141); During the sealing process of the plastic bag, the edges of the plastic sheet on the first roll support (2) and the second roll support (3) are aligned and pass through the drive roller (513) and the driven roller (514).

8. The automatic sealing device for plastic bags according to claim 6, characterized in that: The pressing mechanism (52) includes a second base plate (521) connected to the top of the support platform (1). A second roller bearing (522) is provided above both ends of the second base plate (521). A first linkage column (523) and a second linkage column (524) are rotatably connected between the two second roller bearings (522). The first linkage column (523) is provided with a third gear (5232) at one end, and the second linkage column (524) is provided with a fourth gear (5242) at one end, and the third gear (5232) and the fourth gear (5242) mesh with each other.

9. The automatic sealing device for plastic bags according to claim 8, characterized in that: The first pressure plate (5231) is mirror-mounted on the first linkage column (523); The second linkage column (524) is mirror-mounted with a second pressure plate (5241). The first pressure plate (5231) and the second pressure plate (5241) are attached to each other; During the sealing process of the plastic bag, the edge of the heated plastic sheet passes between the first pressure plate (5231) and the second pressure plate (5241).

10. The automatic sealing device for plastic bags according to claim 1, characterized in that: A reversing roller (21) is provided on the inner side of the first reel support (2); A second motor (61) is provided on the outside of the third reel bracket (6).

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