A heat sealing mechanism for a bag packing machine

Abstract

The application relates to a heat sealing mechanism of a bag feeding packaging machine and relates to the technical field of the bag feeding packaging machine, which comprises a first heat sealing body and a second heat sealing body applied side by side, the first heat sealing body and the second heat sealing body both comprise a fixed base, one side of the fixed base is provided with a front tool base and a rear tool base side by side, the front tool base is located on the side of the rear tool base away from the fixed base, and front heat sealing knives and rear heat sealing knives are fixedly arranged on the sides of the front tool base and the rear tool base close to each other respectively; the fixed base is provided with a connecting piece and a driving piece, the driving piece drives the front tool base and the rear tool base to reciprocate and slide in the direction close to each other through the connecting piece; a protective cover for protecting the connecting piece and the driving piece is fixedly arranged above the fixed base, and the protective cover covers the connecting piece and the driving piece; in the application, the protective cover can effectively prevent a large amount of impurities floating in a workshop from adhering to the connecting piece and the driving piece, and can avoid the adverse effect of impurity accumulation on the sliding performance of related components.

Description

Technical Field

[0001] This application relates to the technical field of bag packaging machines, and in particular to a heat sealing mechanism for a bag packaging machine. Background Technology

[0002] In the operation of a pre-packaging machine, the heat-sealing step is crucial after the bagging process. It directly affects the sealing effect of the bag, thus impacting the product's preservation and transportation quality. As the core component for this function, the performance of the heat-sealing mechanism plays a decisive role in the packaging effect. An efficient and stable heat-sealing mechanism ensures good sealing of the bag, preventing leakage and deterioration of the product during subsequent storage and transportation. Therefore, continuously optimizing the design and performance of the heat-sealing mechanism is of great significance for improving the overall quality and market competitiveness of pre-packaging machines.

[0003] In related technical fields, a common heat-sealing mechanism is widely used. This mechanism mainly consists of a front heat-sealing knife holder and a rear heat-sealing knife holder. The front heat-sealing knife is mounted on the front heat-sealing knife holder, and the rear heat-sealing knife is mounted on the rear heat-sealing knife holder. Structurally, the front heat-sealing knife holder is fixedly connected to the front shaft end of the upper guide post, and the rear heat-sealing knife holder is fixedly connected to the front shaft end of the lower guide post. The upper and lower guide posts are axially movable on the heat-sealing seat. Simultaneously, an upper push block is fixedly connected to the middle of the upper guide post, and the lower end of the upper push block is connected to a lower anti-rotating sleeve movably located on the outer circle of the lower guide post; a lower push block is fixedly connected to the middle of the lower guide post, and the upper end of the lower push block is connected to an upper anti-rotating sleeve movably located on the outer circle of the upper guide post. The upper and lower push blocks are pushed in opposite directions by a heat-sealing cylinder fixedly installed at the bottom of the heat-sealing seat.

[0004] However, when this heat-sealing mechanism is applied to a relatively chaotic workshop environment, a significant problem emerges. The workshop contains a large amount of floating impurities, which easily adhere to the outer periphery of the upper and lower guide pillars. During long-term operation, these impurities accumulate, severely impacting the sliding performance of the upper and lower guide pillars. As the amount of impurities increases, the sliding resistance of the upper and lower guide pillars on the heat-sealing seat increases, potentially leading to jamming or uneven operation. This, in turn, causes inaccurate and unstable movement of the heat-sealing knife, ultimately degrading the overall performance of the heat-sealing mechanism and failing to meet the demands of efficient and high-quality packaging. Therefore, there is considerable room for improvement. Utility Model Content

[0005] The purpose of this application is to provide a heat sealing mechanism for a bag packaging machine, which solves the problem that impurities in a workshop with a poor environment may affect the sliding performance of the upper and lower guide columns when the heat sealing mechanism is located in such a workshop.

[0006] The heat sealing mechanism of the bag packaging machine provided in this application adopts the following technical solution: A heat-sealing mechanism for a bag packaging machine includes a first heat-sealing body and a second heat-sealing body arranged side by side. Both the first and second heat-sealing bodies include a fixed base. A front knife holder and a rear knife holder are arranged side by side on one side of the fixed base. The front knife holder is located on the side of the rear knife holder away from the fixed base. A front heat-sealing knife and a rear heat-sealing knife are respectively fixed on the sides of the front and rear knife holders that are close to each other. A connecting member and a driving member are provided on the fixed base. The driving member drives the front and rear knife holders to slide back and forth in a direction that is close to each other through the connecting member. A protective cover is fixed above the fixed base to protect the connecting member and the driving member. The protective cover covers the connecting member and the driving member.

[0007] By adopting the above technical solution, the packaging bag undergoes heat sealing sequentially through a first heat-sealing body and a second heat-sealing body. The first heat-sealing body acts on the packaging bag earlier than the second heat-sealing body, and its heat-sealing temperature is higher than that of the second heat-sealing body. This double heat sealing not only improves the heat-sealing strength but also rapidly reduces the temperature at the bag opening during the second heat sealing, thus lowering the probability of deformation. Furthermore, a protective cover is installed above the fixed base and over the connecting parts and drive components. When the heat sealing mechanism is in a harsh workshop environment, the protective cover effectively prevents a large amount of floating impurities from adhering to the connecting parts and drive components, avoiding the accumulation of impurities that could adversely affect the sliding performance of related components. This ensures that the front and rear blade holders can slide stably and accurately, allowing the front and rear heat-sealing blades to complete the heat-sealing action normally, improving the performance of the heat-sealing mechanism and meeting the requirements for efficient and high-quality packaging.

[0008] Optionally, the connecting component includes an intermediate component, a first linkage component that links the front tool holder, and a second linkage component that links the rear tool holder; the driving component drives the first and second linkage components to move through the intermediate component.

[0009] By adopting the above technical solution, the connecting parts are subdivided into an intermediate part, a first linkage part that links the front tool holder, and a second linkage part that links the rear tool holder. The driving part drives the two parts to move through the intermediate part. This structural design makes the transmission and conversion of driving force clearer and more reasonable, which facilitates precise control of the linkage movement of the front and rear tool holders. It is beneficial to improve the overall stability and coordination of the heat sealing mechanism and ensure the accuracy and reliability of the heat sealing action.

[0010] Optionally, the fixed seat has a clearance notch, and the intermediate component includes an intermediate plate that is rotatably connected to the inner wall of the clearance notch in the middle; a first connecting rod is rotatably connected to the outer periphery of the intermediate plate, and the driving component is a driving cylinder fixed to the side of the fixed seat away from the rear tool holder, and the end of the first connecting rod away from the intermediate plate is rotatably connected to the end of the hydraulic rod of the driving cylinder.

[0011] By adopting the above technical solution, a clearance notch is opened on the fixed seat and an intermediate plate with a rotating connection is set. With the first connecting rod rotating on the outer periphery of the intermediate plate and the ingenious connection design of the drive cylinder, the linear motion of the drive cylinder is converted into the rotational motion of the intermediate plate. This transmission method has a compact structure and high conversion efficiency, and can more accurately control the rotation angle and speed of the intermediate plate. In turn, it provides a more stable and accurate driving force for the subsequent movement of the front and rear tool holders, which helps to improve the accuracy and reliability of the heat sealing mechanism.

[0012] Optionally, a second link and a third link are rotatably connected to the outer periphery of the intermediate plate, the second link and the third link being symmetrically arranged on opposite sides of the first link; the first linkage includes a plurality of first guide posts slidably mounted side by side on the fixed base, and the second linkage includes a plurality of second guide posts slidably mounted side by side on the fixed base; the first guide posts and the second guide posts are symmetrically arranged on opposite sides of the intermediate plate, the first guide posts being located closer to the second link, and the second guide posts being located closer to the third link; the end of the second link away from the intermediate plate is rotatably connected to the outer periphery of the first guide post, and the end of the third link away from the intermediate plate is rotatably connected to the outer periphery of the second guide post.

[0013] By adopting the above technical solution, a second and third connecting rod are symmetrically arranged on the outer periphery of the intermediate plate, and rotatably connected to the first and second guide posts symmetrically arranged on both sides of the intermediate plate. This symmetrical and reasonable structural design allows the first and second guide posts to slide smoothly and synchronously through the second and third connecting rods when the intermediate plate rotates, thereby realizing the opposite or reverse movement of the front and rear tool holders. This ensures the smoothness and coordination of the movement process and improves the stability of the heat sealing mechanism and the accuracy of the heat sealing action.

[0014] Optionally, the fixed base has a first guide hole through which the first guide post passes and slides, and the fixed base has a second guide hole through which the second guide post passes and slides.

[0015] By adopting the above technical solution, first and second guide holes are opened on the fixed seat for the first and second guide posts to pass through and slide, providing a precise guide path for the sliding of the first and second guide posts. This effectively limits their sliding direction and prevents them from deviating or shaking during the sliding process, thereby ensuring the stability and accuracy of the front and rear cutter holders during the movement process and ensuring the overall efficiency and reliability of the heat sealing mechanism.

[0016] Optionally, the fixed base is provided with a first guide sleeve sleeved on the outer periphery of the first guide post and a second guide sleeve sleeved on the outer periphery of the second guide post on the side facing the front tool holder.

[0017] By adopting the above technical solution, first and second guide sleeves are provided on the side of the fixed seat facing the front knife holder, which are sleeved on the outer periphery of the first guide post and the second guide post. This can further limit and guide the sliding of the first guide post and the second guide post, reduce friction and shaking during the sliding process, enhance sliding stability, ensure that the front knife holder and the rear knife holder move more accurately and smoothly, and effectively improve the overall reliability of the heat sealing mechanism and the heat sealing quality.

[0018] Optionally, a first fixing block is fixedly mounted on the outer periphery of several first guide posts, and a second fixing block is fixedly mounted on the outer periphery of several second guide posts; the fixing seat has a first receiving cavity for inserting and sliding the first fixing block and a second receiving cavity for inserting and sliding the second fixing block, and both the first receiving cavity and the second receiving cavity are connected to the clearance notch; the end of the second connecting rod away from the middle plate is rotatably connected to the first fixing block, and the end of the third connecting rod away from the middle plate is rotatably connected to the second fixing block.

[0019] By adopting the above technical solution, several first guide pillars are jointly fixed to the first fixed block, and several second guide pillars are jointly fixed to the second fixed block. First and second receiving cavities that are adapted to and connected to the clearance notch are provided. At the same time, the second connecting rod and the third connecting rod are rotatably connected to the first and second fixed blocks respectively. This design makes the structure more compact and reasonable, enhances the connection stability between the components, can transmit power more accurately, ensures smooth sliding of the first and second guide pillars, thereby improving the stability and accuracy of the movement of the front and rear tool holders and optimizing the overall performance of the heat sealing mechanism.

[0020] Optionally, the first fixing block has a first rotation notch, and the second fixing block has a second rotation notch; the end of the second connecting rod is rotatably connected to the inner wall of the first rotation notch, and the end of the third connecting rod is rotatably connected to the inner wall of the second rotation notch.

[0021] By adopting the above technical solution, first and second rotation notches are respectively opened on the first and second fixed blocks, and the ends of the second and third connecting rods are rotatably connected to the inner walls of the corresponding rotation notches. This design not only provides a clear and stable rotation fulcrum for the connection between the connecting rod and the fixed block, but also effectively limits the offset of the connecting rod during rotation, making the power transmission more precise and efficient, ensuring the smooth sliding of the first and second guide columns, thereby improving the motion accuracy of the front and rear tool holders, and ensuring the stable and reliable operation of the heat sealing mechanism.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. During heat sealing, the packaging bag undergoes a two-stage heat sealing process, with the first heat sealing body acting on the bag before the second, and its heat sealing temperature being higher. This double heat sealing not only enhances the heat seal strength but also rapidly reduces the temperature at the bag opening during the second heat sealing, minimizing the probability of deformation. This two-stage heat sealing design utilizes a secondary low-temperature heat sealing process to achieve rapid cooling of the sealing area, effectively reducing the risk of deformation at the bag opening during subsequent material handling. This design eliminates the need for additional cooling equipment, resulting in a simple structure, energy savings, and further enhanced sealing strength, improving the sealing performance and quality of the finished product.

[0023] 2. When the heat sealing mechanism is in a workshop with a poor environment, the protective cover can effectively prevent a large number of floating impurities in the workshop from adhering to the connecting parts and driving parts, avoiding the accumulation of impurities from adversely affecting the sliding performance of related parts, ensuring that the front and rear knife holders can slide back and forth stably and accurately, thereby enabling the front and rear heat sealing knives to complete the heat sealing action normally, improving the performance of the heat sealing mechanism, and meeting the needs of efficient and high-quality packaging.

[0024] 3. A second and third connecting rod are symmetrically arranged on the outer periphery of the intermediate plate, and are rotatably connected to the first and second guide posts symmetrically arranged on both sides of the intermediate plate. This symmetrical and reasonable structural design allows the first and second guide posts to slide smoothly and synchronously through the second and third connecting rods when the intermediate plate rotates, thereby realizing the opposite or reverse movement of the front and rear tool holders. This ensures the smoothness and coordination of the movement process and improves the stability of the heat sealing mechanism and the accuracy of the heat sealing action. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is an exploded structural diagram of an embodiment of this application; Figure 3 This is a schematic diagram illustrating the installation and mating of the driving components in an embodiment of this application; Figure 4 This is a cross-sectional structural diagram illustrating the installation and fit of the connecting parts in an embodiment of this application; Figure 5 This is a schematic diagram illustrating the installation and mating of the connecting parts in an embodiment of this application; Figure 6 This is a cross-sectional structural diagram illustrating the installation and cooperation of the first guide sleeve and the second guide sleeve in an embodiment of this application.

[0027] In the diagram, 1. Fixed base; 11. Clearance notch; 12. First guide hole; 13. Second guide hole; 14. First guide sleeve; 15. Second guide sleeve; 16. First receiving cavity; 17. Second receiving cavity; 2. Front tool holder; 21. Front heat sealing knife; 3. Rear tool holder; 31. Rear heat sealing knife; 4. Connecting piece; 41. Intermediate piece; 411. Intermediate plate; 412. First connecting rod; 413. Second connecting rod; 414. Third connecting rod; 42. First linkage piece; 421. First guide post; 422. First fixing block; 4221. First rotation notch; 43. Second linkage piece; 431. Second guide post; 432. Second fixing block; 4321. Second rotation notch; 5. Driving piece; 51. Driving cylinder; 6. Protective cover. Detailed Implementation

[0028] The present application will be further described in detail below with reference to all the accompanying drawings. Example

[0029] Reference Figure 1 , Figure 2 and Figure 3 A heat-sealing mechanism for a bag packaging machine includes a first heat-sealing body and a second heat-sealing body arranged side by side. The first heat-sealing body and the second heat-sealing body have the same structure. Both include a fixed base 1, and a front knife holder 2 and a rear knife holder 3 are arranged side by side on one side of the fixed base 1. The front knife holder 2 is located on the side of the rear knife holder 3 away from the fixed base 1. A front heat-sealing knife 21 and a rear heat-sealing knife 31 are respectively fixed on the sides of the front knife holder 2 and the rear knife holder 3 that are close to each other. The fixed base 1 is provided with a connecting member 4 and a driving member 5. The driving member 5 drives the front knife holder 2 and the rear knife holder 3 to slide back and forth in the direction of mutual approach through the connecting member 4. When the opening of the packaging bag needs to be heat-sealed, it is heat-sealed sequentially through the first heat-sealing body and the second heat-sealing body. The first heat-sealing body acts on the packaging bag earlier than the second heat-sealing body, and the heat-sealing temperature of the first heat-sealing body is higher than that of the second heat-sealing body. The specific heat-sealing process is as follows: the upper opening edge of the packaging bag is placed between the front heat-sealing knife 21 and the rear heat-sealing knife 31. Then, through the driving component 5, the front knife holder 2 and the rear knife holder 3 are driven to slide towards each other in a direction that brings them closer together. When the front heat-sealing knife 21 and the rear heat-sealing knife 31 slide towards each other, they abut against the opening edge of the packaging bag and heat-seal.

[0030] Reference Figure 2 and Figure 3The connecting component 4 includes an intermediate component 41, a first linkage component 42 for linking the front tool holder 2, and a second linkage component 43 for linking the rear tool holder 3; wherein the driving component 5 drives the first linkage component 42 and the second linkage component 43 to move through the intermediate component 41, and a protective cover 6 for protecting the first linkage component 42 and the second linkage component 43 is fixedly installed on the top of the fixed base 1 by screws. After the protective cover 6 is installed, it covers the first linkage 42 and the second linkage 43, reducing the possibility of external dust or other impurities adhering to the first linkage 42, the second linkage 43 and the drive component 5 and affecting the overall performance.

[0031] Reference Figure 4 The fixed base 1 has a clearance notch 11. The intermediate component 41 includes an intermediate plate 411 that is rotatably connected to the inner wall of the clearance notch 11. A first connecting rod 412 is rotatably connected to the outer periphery of the intermediate plate 411. The driving component 5 is a driving cylinder 51 fixed to the side of the fixed base 1 away from the rear tool holder 3. The end of the first connecting rod 412 away from the intermediate plate 411 is rotatably connected to the end of the hydraulic rod of the driving cylinder 51.

[0032] Reference Figure 4 and Figure 5 The middle plate 411 is rotatably connected to a second link 413 and a third link 414 on its outer periphery, wherein the second link 413 and the third link 414 are symmetrically arranged on opposite sides of the first link 412; the first linkage 42 includes two first guide posts 421 that slide side by side on the fixed base 1, and the second linkage 43 includes two second guide posts 431 that slide side by side on the fixed base 1; The first guide post 421 and the second guide post 431 are symmetrically arranged on opposite sides of the intermediate plate 411. The first guide post 421 is located on the side closer to the second connecting rod 413, and the second guide post 431 is located on the side closer to the third connecting rod 414. The end of the second connecting rod 413 away from the intermediate plate 411 is rotatably connected to the outer periphery of the first guide post 421, and the end of the third connecting rod 414 away from the intermediate plate 411 is rotatably connected to the outer periphery of the second guide post 431.

[0033] Reference Figure 4 and Figure 5 Two first guide posts 421 are fixedly provided with a first fixing block 422 on their outer periphery, and two second guide posts 431 are fixedly provided with a second fixing block 432 on their outer periphery. The fixing seat 1 is provided with a first receiving cavity 16 for the first fixing block 422 to be inserted and slid, and a second receiving cavity 17 for the second fixing block 432 to be inserted and slid, wherein the first receiving cavity 16 and the second receiving cavity 17 are both connected to the clearance notch 11. The first fixing block 422 has a first rotation notch 4221, and the second fixing block 432 has a second rotation notch 4321; the end of the second connecting rod 413 away from the intermediate plate 411 is rotatably connected to the inner wall of the first rotation notch 4221, and the end of the third connecting rod 414 away from the intermediate plate 411 is rotatably connected to the inner wall of the second rotation notch 4321.

[0034] Reference Figure 4 and Figure 6 The fixed base 1 has a first guide hole 12 through which the first guide post 421 passes and slides, and a second guide hole 13 through which the second guide post 431 passes and slides. The fixed base 1 has a first guide sleeve 14 sleeved on the outer periphery of the first guide post 421 and a second guide sleeve 15 sleeved on the outer periphery of the second guide post 431 on the side facing the front tool holder 2. This is to limit the sliding of the first guide post 421 and the second guide post 431 during the sliding process.

[0035] The implementation principle of this application embodiment is as follows: When the heat-sealing mechanism is working, the opening edge of the packaging bag is positioned between the front and rear heat-sealing blades 31. The drive cylinder 51 actuates, and its hydraulic rod, via the first connecting rod 412, drives the intermediate plate 411 to rotate within the clearance notch 11. As the intermediate plate 411 rotates, the second connecting rod 413 and the third connecting rod 414 respectively drive the first guide post 421 and the second guide post 431 to slide within the first and second guide holes 13, thereby causing the front and rear blade holders 3 to slide towards each other, so that the front and rear heat-sealing blades 31 abut against the opening edge of the heat-sealed packaging bag. Simultaneously, the protective cover 6 protects the first and second linkage components 43 and the drive component 5, reducing the adhesion of impurities, and the guide sleeve limits the sliding of the guide posts, ensuring stable heat-sealing operation.

[0036] Unless otherwise defined, the terms or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar words used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "a" or "one," and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," and similar words mean that the element or object preceding "comprising" encompasses the element or object listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A heat sealing mechanism for a bag packaging machine, comprising a first heat sealing body and a second heat sealing body applied side by side, each of the first heat sealing body and the second heat sealing body comprising a fixed seat (1), wherein a front knife seat (2) and a rear knife seat (3) are provided side by side on one side of the fixed seat (1), the front knife seat (2) is located on the side of the rear knife seat (3) away from the fixed seat (1), and a front heat sealing knife (21) and a rear heat sealing knife (31) are respectively fixed on the sides of the front knife seat (2) and the rear knife seat (3) that are close to each other; The fixed base (1) is provided with a connecting member (4) and a driving member (5). The driving member (5) drives the front tool holder (2) and the rear tool holder (3) to slide back and forth in a direction that brings them closer together through the connecting member (4). The characteristic of this design is that... A protective cover (6) is fixed above the fixed base (1) to protect the connector (4) and the drive component (5). The protective cover (6) covers the connector (4) and the drive component (5).

2. The heat-sealing mechanism of a bag-packing machine according to claim 1, characterized in that, The connecting component (4) includes an intermediate component (41), a first linkage component (42) that links the front tool holder (2), and a second linkage component (43) that links the rear tool holder (3); the driving component (5) drives the first linkage component (42) and the second linkage component (43) to move through the intermediate component (41).

3. The heat-sealing mechanism of a bag-packing machine according to claim 2, characterized in that, The fixed seat (1) is provided with a clearance notch (11), and the intermediate component (41) includes an intermediate plate (411) that is rotatably connected to the inner wall of the clearance notch (11) in the middle. A first connecting rod (412) is rotatably connected to the outer periphery of the intermediate plate (411). The driving component (5) is a driving cylinder (51) fixed on the side of the fixed seat (1) away from the rear tool holder (3). The end of the first connecting rod (412) away from the intermediate plate (411) is rotatably connected to the end of the hydraulic rod of the driving cylinder (51).

4. The heat-sealing mechanism of a bag-packing machine according to claim 3, characterized in that, The outer periphery of the intermediate plate (411) is rotatably connected to a second link (413) and a third link (414), which are symmetrically arranged on opposite sides of the first link (412); the first linkage (42) includes a plurality of first guide posts (421) slidably mounted on the fixed base (1), and the second linkage (43) includes a plurality of second guide posts (431) slidably mounted on the fixed base (1); The first guide post (421) and the second guide post (431) are symmetrically arranged on opposite sides of the intermediate plate (411). The first guide post (421) is located on the side closer to the second connecting rod (413), and the second guide post (431) is located on the side closer to the third connecting rod (414). The end of the second connecting rod (413) away from the intermediate plate (411) is rotatably connected to the outer periphery of the first guide post (421), and the end of the third connecting rod (414) away from the intermediate plate (411) is rotatably connected to the outer periphery of the second guide post (431).

5. The heat-sealing mechanism of a bag-packing machine according to claim 4, characterized in that, The fixed base (1) is provided with a first guide hole (12) through which the first guide post (421) passes and slides, and the fixed base (1) is provided with a second guide hole (13) through which the second guide post (431) passes and slides.

6. The heat-sealing mechanism of a bag-packing machine according to claim 4, characterized in that, The fixed seat (1) is fixedly provided with a first guide sleeve (14) sleeved on the outer periphery of the first guide post (421) and a second guide sleeve (15) sleeved on the outer periphery of the second guide post (431) on the side facing the front tool holder (2).

7. The heat-sealing mechanism of a bag-packing machine according to claim 4, characterized in that, A first fixing block (422) is fixedly provided on the outer periphery of a plurality of first guide posts (421), and a second fixing block (432) is fixedly provided on the outer periphery of a plurality of second guide posts (431); The fixed base (1) has a first accommodating cavity (16) into which the first fixed block (422) is inserted and slides, and a second accommodating cavity (17) into which the second fixed block (432) is inserted and slides. The first accommodating cavity (16) and the second accommodating cavity (17) are both connected to the clearance notch (11). The end of the second connecting rod (413) away from the middle plate (411) is rotatably connected to the first fixed block (422), and the end of the third connecting rod (414) away from the middle plate (411) is rotatably connected to the second fixed block (432).

8. The heat-sealing mechanism of a bag-packing machine according to claim 7, characterized in that, The first fixing block (422) has a first rotation notch (4221), and the second fixing block (432) has a second rotation notch (4321); the end of the second connecting rod (413) is rotatably connected to the inner wall of the first rotation notch (4221), and the end of the third connecting rod (414) is rotatably connected to the inner wall of the second rotation notch (4321).

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