A knife seat connection assembly and sealing and cutting device

Abstract

The present invention discloses a knife seat connection assembly and a sealing and cutting device. The knife seat connection assembly is used for the sealing and cutting device, and includes a pressing plate; the pressing plate is connected to a driving assembly of the sealing and cutting device, and the knife seat of the sealing and cutting device can be movably connected to the pressing plate along a length direction parallel to the knife seat. When film sealing is required, the knife seat connection assembly is installed on the sealing and cutting device. Since the pressing plate is connected to the driving assembly of the sealing and cutting device, the pressing plate can be driven to a film sealing position under the action of the driving assembly. Since the knife seat of the sealing and cutting device can be movably connected to the pressing plate along a length direction parallel to the knife seat, when the knife seat is heated and deformed, it can stretch along the length direction of the knife seat, thereby avoiding deformation of the knife seat sealing surface caused by thermal deformation.

Description

Technical Field

[0001] The invention relates to the technical field of plastic film packaging, and in particular to a knife seat connecting component and a sealing and cutting device. Background Art

[0002] At present, pipes (PVC, PPR pipes, etc.) are usually packaged with sealing and cutting devices. The upper and lower knife seats of the sealing and cutting devices are both heated heat-sealing molds, that is, heating rods are set on the upper and lower knife seats. During the sealing process, the upper and lower knife seats are often deformed due to heat, and the sealing surface forms uneven changes, resulting in intermittent sealing and local overheating and scalding of the packaging film, and the sealing quality cannot be guaranteed.

[0003] Therefore, how to avoid intermittent sealing and local overheating of the packaging film during film sealing is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] In view of this, the first object of the present invention is to provide a knife holder connection assembly, which can avoid intermittent sealing and local overheating and scalding of the packaging film during film sealing.

[0005] A second object of the present invention is to provide a sealing and cutting device.

[0006] In one aspect, the present invention provides a knife holder connection assembly for a sealing and cutting device, comprising a pressing plate;

[0007] The pressing plate is connected to a driving assembly of the sealing and cutting device, and a knife holder of the sealing and cutting device is movably connected to the pressing plate along a length direction parallel to the knife holder.

[0008] In a specific embodiment, the knife seat connecting assembly further includes a first knife seat guide shaft and a second knife seat guide shaft, one end of each of the first knife seat guide shaft and the second knife seat guide shaft abuts against the pressing plate, and the other end of each of the first knife seat guide shaft and the second knife seat guide shaft passes through the pressing plate to support the knife seat of the sealing and cutting device, and the first knife seat guide shaft can be movably connected to the pressing plate along a length direction parallel to the knife seat, and the second knife seat guide shaft is fixed to the pressing plate along its radial direction; and

[0009] An elastic telescopic component, wherein the elastic telescopic component is in a compressed state, one end of the elastic telescopic component is connected to the pressing plate, and the other end can support the knife seat.

[0010] In another specific embodiment, the tool holder connection assembly includes a tool holder plate for mounting the tool holder;

[0011] The first tool seat guide shaft and the second tool seat guide shaft are both connected to the tool seat plate, and two ends of the elastic telescopic component are respectively connected to the pressing plate and the tool seat plate.

[0012] In another specific embodiment, the knife seat connection assembly further includes a heat insulation pad;

[0013] The heat insulation pad is arranged between the knife seat and the knife seat plate.

[0014] In another specific embodiment, the tool holder connection assembly further includes a guide block;

[0015] The guide block is installed on the pressure plate, and the guide block limits the first tool holder guide axis to move along a length direction parallel to the tool holder.

[0016] In another specific embodiment, the tool holder connection assembly further includes a first end cap, a first adjustment screw and a first sleeve;

[0017] The first end cover is pressed onto the first tool holder guide shaft through the first adjusting screw, and the first sleeve covers the first tool holder guide shaft and is arranged between the first end cover and the pressing plate.

[0018] In another specific embodiment, the tool holder connection assembly further includes a second end cap, a second adjustment screw, and a second sleeve;

[0019] The second end cover is pressed onto the second tool holder guide shaft through the second adjusting screw, the second sleeve covers the second tool holder guide shaft and is arranged between the second end cover and the pressing plate, and the second sleeve is fixedly connected to the pressing plate.

[0020] In another specific embodiment, the tool holder connection assembly further includes a first buffer pad and a second buffer pad;

[0021] The first buffer pad covers the first adjusting screw and is arranged between the first end cover and the first sleeve;

[0022] The second buffer pad covers the second adjusting screw and is arranged between the second end cover and the second sleeve.

[0023] In another specific embodiment, the elastic telescopic assembly includes an adjustment top screw, a tension spring and a top rod;

[0024] The ejector rod is connected to the knife seat plate;

[0025] The pressure plate is provided with a mounting through hole, the adjusting top screw is threadedly connected in the mounting through hole, the tension spring is in a compressed state, and the two ends thereof are respectively connected to the adjusting top screw and the push rod.

[0026] In another specific embodiment, the tool holder connection assembly further includes a bracket plate;

[0027] The bracket plate is used to install the pressing plate;

[0028] Guide bearings are installed at both ends of the bracket plate and can slide along the guide components of the sealing and cutting device.

[0029] The various embodiments according to the present invention can be arbitrarily combined as needed, and the embodiments obtained after these combinations are also within the scope of the present invention and are part of the specific implementation methods of the present invention.

[0030] Without being limited to any theory, it can be seen from the above disclosure that in a specific embodiment, when film sealing is required, the knife holder connection assembly is installed on the sealing and cutting device. Since the pressing plate is connected to the driving assembly of the sealing and cutting device, the driving assembly can drive the pressing plate to the film sealing position. Since the knife holder of the sealing and cutting device can be movably connected to the pressing plate along a direction parallel to the length of the knife holder, when the knife holder is heated and deformed, it can stretch along the length of the knife holder, thereby avoiding deformation of the knife holder sealing surface caused by thermal deformation.

[0031] In a second aspect, the present invention provides a sealing and cutting assembly, comprising an upper sealing and cutting assembly, a lower sealing and cutting assembly, a driving assembly and a frame;

[0032] The driving assembly is mounted on the frame;

[0033] The upper sealing and cutting assembly comprises an upper knife seat, a first heating rod, a cutter assembly and a knife seat connecting assembly as described in any one of the above, the upper knife seat and the cutter assembly are both mounted on the knife seat connecting assembly, the first heating rod is mounted on the upper knife seat, and the driving assembly can drive the upper sealing and cutting assembly to move towards or away from the lower sealing and cutting assembly;

[0034] The lower sealing and cutting assembly includes a lower knife seat, a second heating rod and the knife seat connecting assembly as described above, the lower knife seat is installed on the knife seat connecting assembly, the second heating rod is installed on the lower knife seat, and the driving assembly can drive the lower sealing and cutting assembly to move towards or away from the upper sealing and cutting assembly.

[0035] In a specific embodiment, the sealing and cutting assembly further comprises a guide assembly;

[0036] The guide assembly comprises a guide shaft, both ends of which are mounted on the frame, and the upper sealing and cutting assembly and the lower sealing and cutting assembly can reciprocate along the guide shaft.

[0037] In another specific embodiment, the cutter assembly comprises:

[0038] A cutter drive device, the cutter drive device is mounted on the pressure plate of the upper sealing and cutting assembly;

[0039] A cutter is connected to the driving end of the cutter driving device, and the cutter can pass through the upper sealing and cutting assembly to cut the sealed packaging films.

[0040] The various embodiments according to the present invention can be arbitrarily combined as needed, and the embodiments obtained after these combinations are also within the scope of the present invention and are part of the specific implementation methods of the present invention.

[0041] Without being limited to any theory, it can be seen from the above disclosure that in a specific embodiment, when film sealing is required, the driving assembly drives the upper sealing and cutting assembly and the lower sealing and cutting assembly to move in a direction close to each other, and after clamping the packaging film, the first heating rod and the second heating rod respectively work to generate heat, so that the upper knife seat and the lower knife seat both become hot until the packaging film is sealed. When the knife seat is heated and deformed, it can stretch along the length direction of the knife seat, avoiding deformation of the knife seat sealing surface caused by thermal deformation. In summary, the present invention avoids intermittent sealing and local overheating and scalding of the packaging film when sealing the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other implementation schemes of the present invention can be obtained based on these drawings without creative work.

[0043] Figure 1 A schematic structural diagram of a knife holder connection assembly provided in an embodiment of the present invention;

[0044] Figure 2 A schematic diagram of a partial cross-sectional structure of a tool holder connection assembly provided in an embodiment of the present invention;

[0045] Figure 3 A schematic diagram of the main structure of the knife seat connection assembly provided in an embodiment of the present invention for installing an upper knife seat;

[0046] Figure 4 A schematic diagram of a partial cross-sectional structure of a tool holder connecting assembly provided in an embodiment of the present invention for installing an upper tool holder;

[0047] Figure 5 A schematic diagram of the structure of a knife seat connection assembly provided in an embodiment of the present invention for installing an upper knife seat;

[0048] Figure 6 A schematic diagram of the structure of the sealing and cutting device provided in an embodiment of the present invention when the upper sealing and cutting assembly and the lower sealing and cutting assembly are separated;

[0049] Figure 7 A schematic structural diagram of the sealing and cutting device provided in an embodiment of the present invention when the upper sealing and cutting assembly and the lower sealing and cutting assembly are in a closed state.

[0050] in, Figure 1-7 middle:

[0051] Pressing plate 1, driving assembly 2, elastic telescopic assembly 4, knife seat 3, knife seat plate 7, upper knife seat 301, lower knife seat 302, first knife seat guide shaft 5, second knife seat guide shaft 6, thermal insulation pad 8, guide block 9, first end cover 10, first adjusting screw 11, first sleeve 12, second end cover 13, second adjusting screw 14, second sleeve 15, first buffer pad 16, second buffer pad 17, adjusting top screw 401, tensioning spring 402, push rod 403, bracket plate 18, upper sealing and cutting assembly 19, lower sealing and cutting assembly 20, frame 21, first heating rod 22, second heating rod 23, guide assembly 24, cutter 26, cutter drive device 25, first bearing bushing 27, second bearing bushing 28, guide shaft 29, cylinder connecting plate 30, guide bushing 31. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0053] The terms used in this disclosure have their conventional meanings in the field to which they belong. Here are the definitions of several terms in this disclosure. If the conventional meaning of the term is inconsistent with the definition herein, the definition herein shall prevail.

[0054] Embodiment 1

[0055] like Figure 1-5 As shown, the present invention provides a knife seat connection assembly for a sealing and cutting device, wherein the knife seat connection assembly comprises a pressing plate 1 and an elastic telescopic assembly 4.

[0056] The pressing plate 1 is connected to the driving assembly 2 of the sealing and cutting device, and is used to install the knife holder 3 of the sealing and cutting device (the knife holder 3 includes an upper knife holder 301 and a lower knife holder 302), and the knife holder 3 can be movably connected to the pressing plate 1 along a length direction parallel to the knife holder 3. The length direction of the knife holder 3 refers to the direction in which the knife holder 3 expands and contracts when heated.

[0057] When film sealing is required, the knife holder connecting assembly is installed on the sealing and cutting device. Since the pressing plate 1 is connected to the driving assembly 2 of the sealing and cutting device, the driving assembly 2 can drive the pressing plate 1 to reach the film sealing position. Since the knife holder 3 of the sealing and cutting device can be movably connected to the pressing plate 1 along a direction parallel to the length of the knife holder 3, when the knife holder 3 is heated and deformed, it can stretch along the length of the knife holder 3, thereby avoiding deformation of the sealing surface of the knife holder 3 caused by thermal deformation. In summary, the present invention avoids intermittent sealing and local overheating that scalds the packaging film when sealing the film.

[0058] Embodiment 2

[0059] In the second embodiment provided by the present invention, the structure of the blade holder connecting assembly in this embodiment is similar to that of the blade holder connecting assembly in the first embodiment, and the similarities will not be repeated, and only the differences will be introduced.

[0060] In this embodiment, the present invention specifically discloses that the knife seat connecting assembly also includes a first knife seat guide shaft 5, a second knife seat guide shaft 6 and an elastic telescopic assembly 4, and the first knife seat guide shaft 5 and the second knife seat guide shaft 6 are both abutted on the pressure plate 1 at one end, and the other end passes through the pressure plate 1 to support the knife seat 3 of the sealing and cutting device, and the first knife seat guide shaft 5 can be movably connected to the pressure plate 1 along a length direction parallel to the knife seat 3, and the second knife seat guide shaft 6 is fixed on the pressure plate 1 along its radial direction.

[0061] The elastic telescopic component 4 is in a compressed state, and one end of the elastic telescopic component 4 is connected to the pressing plate 1, and the other end can support the knife seat 3, so that the knife seat 3 can press the packaging film tightly to reduce noise. The elastic telescopic component 4 can also make the upper knife seat 301 and the lower knife seat 302 fit tightly to avoid uneven sealing of the knife seat 3. In summary, the present invention avoids intermittent sealing and local overheating that scalds the packaging film during film sealing.

[0062] Further, the present invention discloses that the knife seat connection assembly includes a knife seat plate 7 for mounting the knife seat 3, the first knife seat guide shaft 5 and the second knife seat guide shaft 6 are both connected to the knife seat plate 7, and the two ends of the elastic telescopic assembly 4 are respectively connected to the pressing plate 1 and the knife seat plate 7. The elastic telescopic assembly 4 makes the first knife seat guide shaft 5 and the second knife seat guide shaft 6 abut against the pressing plate 1. The setting of the knife seat plate 7 avoids the problem of uneven installation caused by direct connection with the knife seat 3.

[0063] In order to reduce the thermal deformation caused by the heat transfer from the knife seat 3 to the knife seat plate 7, the knife seat connection assembly disclosed in the present invention further includes a heat insulation pad 8, which is arranged between the knife seat 3 and the knife seat plate 7. The heat insulation pad 8 can insulate heat and can be made of any heat insulation material.

[0064] Furthermore, the present invention discloses that the tool holder connection assembly also includes a guide block 9, which is mounted on the pressure plate 1, and the guide block 9 limits the first tool holder guide shaft 5 to move along the length direction parallel to the tool holder 3. Specifically, there are two guide blocks 9, and the two guide blocks 9 are both arranged parallel to the length direction of the tool holder 3, and the spacing between the guide blocks 9 is just enough to allow the first tool holder guide shaft 5 to move along the length direction parallel to the tool holder 3.

[0065] Furthermore, the present invention discloses that the tool holder connecting assembly also includes a first end cover 10, a first adjusting screw 11 and a first sleeve 12. The outer diameter of the first sleeve 12 is constant. The first end cover 10 is pressed onto the first tool holder guide shaft 5 by the first adjusting screw 11. The first sleeve 12 is externally mounted on the first tool holder guide shaft 5 and is arranged between the first end cover 10 and the pressure plate 1.

[0066] Specifically, in order to prevent the first tool seat guide shaft 5 from being damaged, the present invention discloses that the tool seat connection assembly further includes a first bearing bushing 27. A first mounting through hole is provided on the pressing plate 1, and the first tool seat guide shaft 5 passes through the first mounting through hole. The first bearing bushing 27 is disposed on the section of the first tool seat guide shaft 5 located in the first mounting through hole. The length of the first mounting through hole along the length direction parallel to the tool seat 3 can be set according to the length of the tool seat 3 extended by heat.

[0067] Further, the present invention discloses that the tool holder connection assembly also includes a second end cover 13, a second adjustment screw 14, and a second sleeve 15. The second end cover 13 is pressed on the second tool holder guide shaft 6 by the second adjustment screw 14. The second sleeve 15 covers the second tool holder guide shaft 6 and is arranged between the second end cover 13 and the pressing plate 1. The second sleeve 15 is fixedly connected to the pressing plate 1. Specifically, the outer diameter of the upper section of the second sleeve 15 is larger than the outer diameter of the second sleeve 15, and the top of the upper section of the second sleeve 15 is fixed to the pressing plate 1 by screws.

[0068] Specifically, in order to prevent the second tool holder guide shaft 6 from being damaged, the present invention discloses that the tool holder connection assembly further includes a second bearing bushing 28. A second mounting through hole is provided on the pressing plate 1, the second tool holder guide shaft 6 passes through the second mounting through hole, and the second bearing bushing 28 is sleeved on the section of the second tool holder guide shaft 6 located in the second mounting through hole.

[0069] Furthermore, the present invention discloses that the knife seat connection assembly also includes a first buffer pad 16 and a second buffer pad 17. The first buffer pad 16 is covered with the first adjustment screw 11 and is arranged between the first end cover 10 and the first sleeve 12. The second buffer pad 17 is covered with the second adjustment screw 14 and is arranged between the second end cover 13 and the second sleeve 15. The arrangement of the first buffer pad 16 and the second buffer pad 17 enables the gap adjustment of the knife seat 3 to be achieved by adjusting the first adjustment screw 11 and the second adjustment screw 14, and the buffer distance can be set, which is convenient for packaging of packaging films of various thicknesses.

[0070] Furthermore, the present invention specifically discloses that the elastic telescopic component 4 includes an adjusting top screw 401 , a tensioning spring 402 and a top rod 403 .

[0071] The push rod 403 is connected to the knife seat plate 7, and a mounting through hole is provided on the pressure plate 1. The adjusting push screw 401 is threadedly connected in the mounting through hole. The tension spring 402 is in a compressed state, and the two ends are respectively connected to the adjusting push screw 401 and the push rod 403. The tension of the tension spring 402 is adjusted by adjusting the adjusting screw, thereby adjusting the engagement and pressing force of the knife seat 3. In order to achieve uniform distribution of the engagement force of the knife seat 3, the present invention further discloses that the number of elastic compression spring assemblies is 8 groups, which are evenly distributed along both sides of the center line of the length direction of the pressure plate 1.

[0072] It should be noted that the elastic telescopic component 4 may also include a compression spring in a compressed state and a connecting rod connected to the knife seat plate 7 .

[0073] Furthermore, in order to facilitate the lifting and lowering of the knife holder connecting assembly, the present invention discloses that the knife holder connecting assembly also includes a bracket plate 18, the bracket plate 18 is used to install the pressure plate 1, and guide bearings are installed at both ends of the bracket plate 18, which can slide along the guide assembly 24 of the sealing and cutting device.

[0074] The present invention can be applied to various heat-sealing film materials, and can adapt to packaging films of different thicknesses by controlling the engagement time of the knife holder 3 .

[0075] The present invention enables the knife seat 3 to be repeatedly engaged and positioned accurately, and has a built-in buffer function; the buffer distance can be set by adjusting the first adjusting screw 11 and the second adjusting screw 14; the engagement clamping force of the knife seat 3 can be set by adjusting the adjustment top screw 401 to ensure the best sealing effect; 8 groups of tensioning springs 402 and push rods 403 balance the force on the knife seat 3 to avoid uneven sealing; and the thermal deformation caused by the heat transfer from the knife seat 3 to the knife seat plate 7 is reduced by the thermal insulation pad 8.

[0076] In addition, the present invention can greatly reduce the meshing noise of the knife seat 3 during the operation of the equipment by adjusting the buffer distance and the tensioning force of the tensioning spring 402.

[0077] The present invention avoids poor sealing caused by deformation of the knife seat 3. The heat of the knife seat plate 7 is reduced by the heat insulation pad 8, and the thermal deformation of the knife seat plate 7 is reduced. Secondly, after the knife seat plate 7 is deformed by heat, it can change accordingly in the length direction of the knife seat 3, thereby ensuring the flatness of the knife seat plate 7 and the knife seat 3 and avoiding bending deformation.

[0078] Embodiment 3

[0079] like Figure 6-7 As shown, the present invention provides a sealing and cutting assembly, including an upper sealing and cutting assembly 19, a lower sealing and cutting assembly 20, a driving assembly 2 and a frame 21. It is suitable for packaging of large-diameter cross-section packaging materials, and the packaging film is sealed and cut from the middle part to improve the aesthetics of the packaging; the sealing strength and sealing stability are improved by controlling the sealing time.

[0080] The driving component 2 is installed on the frame 21. The driving component 2 can be two cylinders that directly drive the upper sealing and cutting component 19 and the lower sealing and cutting component 20 to rise and fall respectively, or it can be one cylinder that drives a synchronous pulley or sprocket to achieve the lifting and falling of the upper sealing and cutting component 19 and the lower sealing and cutting component 20, and it can also be achieved through a connecting rod mechanism.

[0081] The upper sealing and cutting assembly 19 includes an upper knife seat 301, a first heating rod 22, a cutter assembly and a knife seat connecting assembly as in any of the above-mentioned embodiments. The upper knife seat 301 and the cutter assembly are both mounted on the knife seat connecting assembly. The first heating rod 22 is mounted on the upper knife seat 301. The driving assembly 2 can drive the upper sealing and cutting assembly 19 to move toward or away from the lower sealing and cutting assembly 20.

[0082] The lower sealing and cutting assembly 20 includes a lower knife seat 302, a second heating rod 23 and a knife seat connecting assembly as in any of the above embodiments, the lower knife seat 302 is installed on the knife seat connecting assembly, the second heating rod 23 is installed on the lower knife seat 302, and the driving assembly 2 can drive the lower sealing and cutting assembly 20 to move in a direction close to or away from the upper sealing and cutting assembly 19.

[0083] The bottom end of the frame 21 is provided with a liftable support foot, which is threadedly connected to the bottom end of the frame 21 .

[0084] When film sealing is required, the driving assembly 2 drives the upper sealing and cutting assembly 19 and the lower sealing and cutting assembly 20 to move toward each other. After clamping the packaging film, the first heating rod 22 and the second heating rod 23 respectively work to generate heat, so that the upper knife seat 301 and the lower knife seat 302 are both heated until the packaging film is sealed. When the knife seat 3 is heated and deformed, it can stretch along the length direction of the knife seat 3, avoiding deformation of the sealing surface of the knife seat 3 caused by thermal deformation. In summary, the present invention avoids intermittent sealing and local overheating and scalding of the packaging film when sealing the film.

[0085] Embodiment 4

[0086] In the fourth embodiment provided by the present invention, the sealing and cutting assembly in this embodiment has a similar structure to that in the third embodiment, and the similarities will not be described in detail, and only the differences will be introduced.

[0087] In this embodiment, the present invention specifically discloses that the sealing and cutting assembly also includes a guide assembly 24, the guide assembly 24 includes a guide shaft 29, both ends of the guide shaft 29 are installed on the frame 21, and the upper sealing and cutting assembly 19 and the lower sealing and cutting assembly 20 can reciprocate along the guide shaft 29.

[0088] Furthermore, the present invention discloses a cutter assembly including a cutter driving device 25 and a cutter 26 .

[0089] The cutter drive device 25 is installed on the pressure plate 1 of the upper sealing and cutting assembly 19, and the cutter 26 is connected to the driving end of the cutter drive device 25, and the cutter 26 can pass through the upper sealing and cutting assembly 19 to cut the sealed packaging film. Specifically, the cutter 26 can pass through the middle part of the knife seat 3.

[0090] Specifically, the cutter drive device 25 includes a cutter 26 cylinder, a cylinder connecting plate 30 and a guide shaft 29. The guide shaft 29 is connected to the cutter 26 and can be lifted and lowered in a guide hole provided on the pressing plate 1 to guide the cutter 26. In order to prevent the guide shaft 29 from hitting the wall of the guide hole during the lifting process, the present invention further discloses that the guide shaft 29 is covered with a guide bushing 31.

[0091] The cylinder connecting plate 30 is mounted on the pressing plate 1 , and the cutter 26 cylinder and the driving assembly 2 are both mounted on the cylinder connecting plate 30 .

[0092] In the present invention, words indicating directions are only used for convenience of description and have no other specific meanings.

[0093] In the present invention, "first", "second" and so on are used for description only and have no other special meanings.

[0094] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and inventive features disclosed herein.

Claims

1. A sealing and cutting device, characterized in that: It comprises an upper sealing and cutting assembly (19), a lower sealing and cutting assembly (20), a driving assembly (2) and a frame (21); The driving assembly (2) is mounted on the frame; The upper sealing and cutting assembly (19) comprises an upper knife seat (301), a first heating rod (22), a cutter assembly and a knife seat connecting assembly, the upper knife seat (301) and the cutter assembly are both mounted on the knife seat connecting assembly, the first heating rod (22) is mounted on the upper knife seat (301), and the driving assembly (2) is capable of driving the upper sealing and cutting assembly (19) to move in a direction approaching or away from the lower sealing and cutting assembly (20); The lower sealing and cutting assembly (20) comprises a lower knife seat (302), a second heating rod (23) and the knife seat connecting assembly, the lower knife seat (302) is mounted on the knife seat connecting assembly, the second heating rod (23) is mounted on the lower knife seat (302), and the driving assembly (2) is capable of driving the lower sealing and cutting assembly (20) to move in a direction approaching or away from the upper sealing and cutting assembly (19); It also includes a guide assembly (24); the guide assembly (24) includes a guide shaft, both ends of the guide shaft are mounted on the frame, and the upper sealing and cutting assembly (19) and the lower sealing and cutting assembly (20) are capable of reciprocating along the guide shaft; The cutter assembly comprises: a cutter drive device (25), the cutter drive device (25) being mounted on the pressure plate (1) of the upper sealing and cutting assembly (19); a cutter (26), the cutter (26) being connected to the driving end of the cutter drive device (25), and the cutter (26) being capable of passing through the upper sealing and cutting assembly (19) to cut the sealed packaging films; The knife seat connection assembly comprises a pressing plate (1); the pressing plate (1) is connected to the driving assembly (2) of the sealing and cutting device, the pressing plate (1) is used to install the knife seat (3) of the sealing and cutting device, and the knife seat (3) of the sealing and cutting device can be movably connected to the pressing plate (1) along a length direction parallel to the knife seat (3), and the length direction of the knife seat (3) refers to the direction in which the knife seat (3) expands and contracts when heated; Also includes: a first knife seat guide shaft (5) and a second knife seat guide shaft (6), wherein one end of the first knife seat guide shaft (5) and the second knife seat guide shaft (6) are both abutted against the pressing plate (1), and the other end of the first knife seat guide shaft (5) passes through the pressing plate (1) to support the knife seat (3) of the sealing and cutting device, and the first knife seat guide shaft (5) can be movably connected to the pressing plate (1) along a length direction parallel to the knife seat (3), and the second knife seat guide shaft (6) is fixed to the pressing plate (1) along its radial direction; and An elastic telescopic component (4), wherein the elastic telescopic component (4) is in a compressed state, and one end of the elastic telescopic component (4) is connected to the pressure plate (1), and the other end is capable of supporting the knife seat (3); the elastic telescopic component (4) comprises an adjusting top screw (401), a tensioning spring (402) and a push rod (403); the push rod (403) is connected to the knife seat plate (7); a mounting through hole is provided on the pressure plate (1), the adjusting top screw (401) is threadedly connected to the mounting through hole, the tensioning spring (402) is in a compressed state, and the two ends are respectively connected to the adjusting top screw (401) and the push rod (403); It also includes a first bearing bushing (27), the pressing plate (1) is provided with a first mounting through hole, the first tool holder guide shaft (5) passes through the first mounting through hole, and the first bearing bushing (27) is sleeved on the section of the first tool holder guide shaft (5) located in the first mounting through hole; It also includes a knife seat plate (7) for mounting the knife seat (3); the first knife seat guide shaft (5) and the second knife seat guide shaft (6) are both connected to the knife seat plate (7), and the two ends of the elastic telescopic component (4) are respectively connected to the pressing plate (1) and the knife seat plate (7); It also includes a heat insulation pad (8); the heat insulation pad (8) is arranged between the knife seat (3) and the knife seat plate (7); It also includes a guide block (9); the guide block (9) is mounted on the pressure plate (1), and the guide block (9) limits the first tool holder guide shaft (5) to move along a length direction parallel to the tool holder (3); It also includes a first end cover (10), a first adjusting screw (11) and a first sleeve (12); the first end cover (10) is pressed onto the first tool holder guide shaft (5) through the first adjusting screw (11); the first sleeve (12) is sheathed around the first tool holder guide shaft (5) and is arranged between the first end cover (10) and the pressure plate (1); It also includes a second end cover (13), a second adjusting screw (14) and a second sleeve (15); the second end cover (13) is pressed onto the second tool holder guide shaft (6) through the second adjusting screw (14); the second sleeve (15) is sheathed around the second tool holder guide shaft (6) and is arranged between the second end cover (13) and the pressing plate (1); and the second sleeve (15) is fixedly connected to the pressing plate (1); It also includes a first buffer pad (16) and a second buffer pad (17); the first buffer pad (16) is disposed on the first adjusting screw (11) and is arranged between the first end cover (10) and the first sleeve (12); the second buffer pad (17) is disposed on the second adjusting screw (14) and is arranged between the second end cover (13) and the second sleeve (15); It also comprises a bracket plate (18); the bracket plate (18) is used to mount the pressure plate (1); guide bearings are mounted on both ends of the bracket plate (18) and are capable of sliding along the guide assembly of the sealing and cutting device.

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