Longitudinal sealing mechanism of a bag making machine

Abstract

The application discloses a longitudinal sealing mechanism of a bag making machine, which comprises a mounting support slidingly arranged on a rack of the bag making machine, a plurality of lower longitudinal sealing devices arranged on the mounting support through a driving frame, and a plurality of upper longitudinal sealing devices corresponding to the lower longitudinal sealing devices respectively, the driving frame comprises a lifting bottom frame slidingly connected to the mounting support and a lifting motor driving the lifting bottom frame through a transmission device, the transmission device comprises a transmission shaft and two cam shafts, one end of the transmission shaft is connected to an output shaft of the lifting motor through a gear transmission mechanism, the other end of the transmission shaft is connected to the corresponding cam shafts through a synchronous belt transmission mechanism respectively, and the cam shafts are connected to the lifting bottom frame through a plurality of cam mechanisms respectively. The longitudinal sealing mechanism of the bag making machine has the advantages that the lifting motor synchronously drives a plurality of lower longitudinal sealing devices through the lifting bottom frame, and the consistency of the actions of the lower longitudinal sealing devices is improved.

Description

Technical Field

[0001] This application relates to the field of automated production technology, and in particular to a longitudinal sealing mechanism for a bag making machine. Background Technology

[0002] A bag-making machine is a device used to produce various plastic packaging bags. With social development, plastic packaging bags have become an indispensable item in people's lives. A bag-making machine includes longitudinal sealing mechanisms, transverse sealing mechanisms, and punching mechanisms spaced apart along the conveying direction. The longitudinal sealing mechanism contains multiple sets of longitudinal sealing devices, each with its own independent drive device. This results in a complex overall structure for the bag-making machine, and poor synchronization between the longitudinal sealing devices, which can easily cause traction on the film material at adjacent workstations, leading to film deformation and poor precision. Therefore, improvements are needed. Utility Model Content

[0003] The purpose of this invention is to provide a longitudinal sealing mechanism for a bag making machine to overcome the shortcomings of the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: This utility model discloses a longitudinal sealing mechanism for a bag making machine, including a mounting bracket slidably disposed on the frame of the bag making machine, a plurality of lower longitudinal sealing devices disposed on the mounting bracket via a drive frame, and a plurality of upper longitudinal sealing devices respectively corresponding to the lower longitudinal sealing devices. The drive frame includes a lifting base frame slidably connected to the mounting bracket and a lifting motor driving the lifting base frame via a transmission device. The transmission device includes a drive shaft and two cam shafts. One end of the drive shaft is connected to the output shaft of the lifting motor via a gear transmission mechanism, and the other end is connected to the corresponding cam shafts via a synchronous belt transmission mechanism. The cam shafts are respectively connected to the lifting base frame via a plurality of cam mechanisms.

[0005] Furthermore, in the longitudinal sealing mechanism of the bag making machine described above, the lower longitudinal sealing device includes a lower crossbeam slidably disposed on the lifting base frame via a first guide rail and a lower sealing knife disposed at the top of the lower crossbeam. The two ends of the lower crossbeam are respectively provided with a first bearing seat, and a first gear shaft is connected between the two first bearing seats. The end of the first gear shaft passes through the first bearing seat and is connected to a first gear. The lifting base frame is provided with a first rack corresponding to the first gear.

[0006] Furthermore, in the longitudinal sealing mechanism of the bag making machine described above, the first rack is connected to the mounting bracket via a first locking strip. The top of the first locking strip is recessed with a T-shaped first locking groove. A first locking handle is provided on one side of the first bearing seat. A first locking block that slides in the first locking groove is provided on the stud of the first locking handle.

[0007] Furthermore, in the longitudinal sealing mechanism of the bag making machine described above, the upper longitudinal sealing device includes an upper crossbeam slidably connected to the mounting bracket and an upper sealing knife connected to the bottom end of the upper crossbeam. The upper crossbeam is provided with a lifting cylinder and a guide shaft connected to the upper sealing knife.

[0008] Furthermore, in the longitudinal sealing mechanism of the bag making machine described above, the two ends of the upper crossbeam are respectively connected to the mounting bracket via sliding plates, a rotating second gear shaft is connected between the two sliding plates, the sliding plates are slidably connected to the mounting bracket via a second guide rail, the two ends of the second gear shaft are respectively connected to second gears, and a second rack corresponding to the second gear is provided inside the mounting bracket.

[0009] Furthermore, in the longitudinal sealing mechanism of the bag making machine described above, a second locking bar is provided on one side of the second guide rail, the second locking bar is recessed with a T-shaped second locking groove, a second locking handle is provided in the sliding plate, and a second locking block is provided on the stud of the second locking handle that slides in the second locking groove.

[0010] Furthermore, in the longitudinal sealing mechanism of the bag making machine described above, the lifting bottom frame is slidably connected to the mounting bracket via a vertical third guide rail. The mounting bracket is provided with an inner support flat steel, which abuts against the lifting bottom frame via a spring.

[0011] Furthermore, in the longitudinal sealing mechanism of the bag making machine described above, the synchronous belt drive mechanism includes a driving wheel disposed on the drive shaft, driven wheels respectively sleeved on the cam shaft, and a synchronous belt drivingly connecting the driving wheel and the two driven wheels.

[0012] Furthermore, in the longitudinal sealing mechanism of the bag making machine described above, tensioning wheels are respectively provided between the driving wheel and the two driven wheels. The two ends of the rotating shaft of the tensioning wheel are respectively mounted on the mounting bracket via mounting strips. The mounting strips are provided with adjusting threaded holes. The two ends of the rotating shaft of the tensioning wheel are respectively connected to the corresponding adjusting threaded holes via adjusting bolts. Locking nuts are provided on the adjusting bolts.

[0013] Furthermore, in the longitudinal sealing mechanism of the bag making machine described above, the two driven wheels are provided with two steering idler wheels, and the installation height of the tension wheel and the steering idler wheels is higher than the installation height of the driven wheels.

[0014] Compared with the prior art, the longitudinal sealing mechanism of the bag making machine of this utility model has a simple structure. The lifting motor synchronously drives multiple lower longitudinal sealing devices through the lifting base frame, which improves the consistency of the lower longitudinal sealing device's operation. The upper and lower longitudinal sealing devices are slidably mounted on the mounting bracket and the lifting base frame, respectively, to meet the needs of adjusting the longitudinal sealing position. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 The diagram shown is a schematic diagram of the cover of the longitudinal sealing mechanism of the bag making machine in a specific embodiment of this utility model.

[0016] Figure 2 The diagram shown is an internal view of the cover of the longitudinal sealing mechanism of the bag making machine in a specific embodiment of this utility model.

[0017] Figure 3 The diagram shown is a structural schematic of the longitudinal sealing mechanism of a bag-making machine in a specific embodiment of this utility model.

[0018] Figure 4 The diagram shown is a transmission schematic of the mounting bracket and the bag-making machine frame in a specific embodiment of this utility model.

[0019] Figure 5 The diagram shown is a structural schematic of the mounting bracket in a specific embodiment of this utility model.

[0020] Figure 6 The figure shown is a structural schematic diagram of the lifting base frame in a specific embodiment of this utility model.

[0021] Figure 7 The diagram shown is a transmission schematic of the lower longitudinal sealing device and the lifting bottom frame in a specific embodiment of this utility model.

[0022] Figure 8 The diagram shown is an installation schematic of the upper longitudinal sealing device in a specific embodiment of this utility model.

[0023] Figure 9 The diagram shown is a transmission schematic of the upper longitudinal sealing device and the mounting bracket in a specific embodiment of this utility model.

[0024] Figure 10 The diagram shown is a structural schematic of the upper longitudinal sealing device in a specific embodiment of this utility model.

[0025] Figure 11 The diagram shown is a transmission schematic of the lifting motor and the lifting frame in a specific embodiment of this utility model.

[0026] Figure 12 The diagram shown is a structural schematic of the transmission device in a specific embodiment of this utility model. Detailed Implementation

[0027] The technical solutions of the present utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] Combination Figures 1 to 12 As shown, a longitudinal sealing mechanism for a bag making machine includes a mounting bracket 2 slidably mounted on the frame 1 of the bag making machine, a plurality of lower longitudinal sealing devices 3 mounted on the mounting bracket 2 via a drive frame, and a plurality of upper longitudinal sealing devices 4 corresponding to the lower longitudinal sealing devices 3. The drive frame includes a lifting base frame 5 slidably connected to the mounting bracket 2 and a lifting motor 7 driving the lifting base frame 5 via a transmission device 6. The transmission device 6 includes a drive shaft 61 and two camshafts 62. One end of the drive shaft 61 is connected to the output shaft of the lifting motor 7 via a gear transmission mechanism 63, and the other end is connected to the corresponding camshafts 62 via a synchronous belt transmission mechanism 64. The camshafts 62 are connected to the lifting base frame 5 via a plurality of cam mechanisms 65.

[0029] In this technical solution, the bag-making machine frame is assembled from conventional profiles and placed horizontally using conventional adjustable feet. Linear guide rails, positioned along the direction of film / packaging bag travel, are installed on both sides of the top using conventional bolts. Support frames on both sides of the mounting bracket are connected to sliders on the linear guide rails. A rack is installed on one side of the linear guide rail. The mounting bracket rotatably mounts a gear shaft via conventional bearing seats. Gears meshing with the rack are mounted on the gear shaft. Conventional handwheels are located at both ends of the gear shaft for easy rotation, thereby moving the entire mounting bracket along the linear guide rails. The mounting bracket includes a column and supports connected to the linear guide rails. The upper and lower side panels between the columns form a rectangular frame structure. To improve the overall strength of the mounting bracket, reinforcing columns and plates are also provided. The outer walls of the bag making machine frame and the mounting bracket are equipped with conventional covers. The covers are used to separate the interior of the longitudinal sealing mechanism from the outside to prevent accidents such as personnel injury. At the same time, the covers can also be used as mounting plates for components such as pressure gauges. The two ends of the covers are reserved with inlet and outlet ports for packaging bags / film materials. The lifting motor drives two cam shafts to rotate synchronously through the transmission shaft, thereby driving the lifting base frame to rise and fall through the cam mechanism, which in turn drives the lower longitudinal sealing device to rise and fall, ensuring the consistency of the lower longitudinal sealing device's operation.

[0030] For example, see Figures 2 to 7As shown, the lower longitudinal sealing device 3 includes a lower crossbeam 32 slidably mounted on the lifting base frame 5 via a first guide rail 31 and a lower sealing knife 33 mounted on the top of the lower crossbeam 32. The two ends of the lower crossbeam 32 are respectively provided with a first bearing seat 34, and a first gear shaft 35 is connected between the two first bearing seats 34. The end of the first gear shaft 35 passes through the corresponding first bearing seat 34 and is connected to a first gear 36. A first rack 51 corresponding to the first gear 36 is provided inside the lifting base frame 5.

[0031] In this technical solution, both the lower crossbeam and the lower sealing knife are existing structures. The upper sealing knife includes a heat sealing knife and a cold sealing knife. The surface of the heat sealing knife is provided with a Teflon or other anti-adhesion layer. The lifting base frame includes two horizontal plates 52 (perpendicular to the length direction of the lower sealing knife) and two vertical plates 53 (parallel to the length direction of the lower sealing knife). The two ends of the vertical plates are respectively slidably connected to the corresponding columns of the mounting bracket through a third guide rail. The first guide rail is fixed to the top of the horizontal plate by conventional installation structures such as bolts. The lower crossbeam is connected to the slider of the first guide rail. One end of the first gear shaft is rotated by a conventional hand crank, etc., thereby driving the corresponding lower vertical sealing device to move along the first guide rail through the meshing of the first gear and the first rack, so as to adjust the working position of the lower vertical sealing device.

[0032] For example, see Figures 2 to 7 As shown, the first rack 51 is connected to the mounting bracket 2 via the first locking bar 54. The top of the first locking bar 54 is recessed with a T-shaped first locking groove. A first locking handle 341 is provided on one side of the first bearing seat 34. A first locking block that slides in the first locking groove is provided on the stud of the first locking handle 341.

[0033] In this technical solution, the first locking strip is installed on the top of the horizontal plate by bolts, etc., and is set between the first rack and the first guide rail. The side of the first rack is connected to the side of the first locking strip by bolts, etc. The first locking strip and the first guide rail are spaced apart so as not to interfere with the free sliding of the first guide rail slider. The first bearing seat is slidably connected to the first locking strip by the first locking block. After the position of the lower horizontal sealing device is adjusted to the correct position, the first locking block is pulled upward by the first locking handle. The first locking block abuts against the corresponding inner wall of the first locking groove. The first bearing seat is fixed by the friction between the first locking block and the inner wall support of the first locking groove, thus fixing the lower horizontal sealing device.

[0034] For example, see Figures 1 to 3 as well as Figures 8 to 10 As shown, the upper longitudinal sealing device 4 includes an upper crossbeam 41 slidably connected to the mounting bracket 2 and an upper sealing knife 42 connected to the bottom end of the upper crossbeam 41. The upper crossbeam 41 is provided with a lifting cylinder 43 and a guide shaft 44 connected to the upper sealing knife 42.

[0035] In this technical solution, both the upper crossbeam and the upper sealing knife are existing structures. The piston rod of the lifting cylinder slides through the upper crossbeam and is connected to the upper sealing knife. Thus, the upper sealing knife is lifted and lowered by the extension and retraction of the piston rod of the lifting cylinder. One end of the guide shaft is connected to the upper sealing knife by conventional threaded connection or other means, and the other end is slidably connected to the upper crossbeam. The upper crossbeam is equipped with conventional structures such as linear bearings or guide bushings corresponding to the guide shaft. Through the action of the guide shaft, the upper sealing knife is restricted to move only along the axial direction of the guide shaft.

[0036] For example, see Figures 1 to 3 as well as Figures 8 to 10 As shown, the two ends of the upper crossbeam 41 are connected to the mounting bracket 2 via sliding plates 411. A rotating second gear shaft 45 is connected between the two sliding plates 411. The sliding plates 411 are slidably connected to the mounting bracket 2 via the second guide rail 46. The two ends of the second gear shaft 45 are respectively connected to the second gear 47. A second rack 21 corresponding to the second gear 47 is provided inside the mounting bracket 2.

[0037] In this technical solution, the sliding plate is a conventional plate structure and is set at the end of the upper crossbeam by conventional bolts, etc. A reinforcing beam is connected between the two sliding plates, and a conventional valve plate structure is installed on the reinforcing beam for connecting external air sources to the lifting cylinder. The sliding plate is equipped with a bearing for rotatably mounting the second gear shaft. A support plate is set between the two sliding plates. The support plate is rotatably sleeved on the second gear shaft by conventional bearings, and the support plate is slidably connected to the reinforcing plate of the mounting bracket by conventional linear guide rails. The second rack and the second guide rail are fixed to the mounting bracket by conventional mounting structures such as bolts. The upper crossbeam is connected to the slider of the second guide rail by the sliding plate. The end of the second gear shaft is rotated by conventional hand cranks, etc., thereby driving the corresponding lower longitudinal sealing device to move along the first guide rail through the meshing of the first gear and the first rack, so as to adjust the working position of the lower longitudinal sealing device.

[0038] For example, see Figures 1 to 3 as well as Figures 8 to 10 As shown, a second locking bar 48 is provided on one side of the second guide rail 46. The second locking bar 48 is recessed with a T-shaped second locking groove. A second locking handle 49 is provided inside the sliding plate. A second locking block that slides in the second locking groove is provided on the stud of the second locking handle 49.

[0039] In this technical solution, the second locking strip is installed on the upper plate corresponding to the mounting bracket by bolts, etc. The sliding plate is slidably connected to the second locking strip by the first locking block. When the position of the upper horizontal sealing device is adjusted to the correct position, the second locking block is pulled by the second locking handle. The second locking block abuts against the corresponding inner wall of the second locking groove. The sliding plate is fixed by the friction of the second locking block and the inner wall bracket of the second locking groove, thus fixing the upper horizontal sealing device.

[0040] For example, see Figures 2 to 7 as well as Figure 11 and Figure 12 As shown, the lifting base frame 5 is slidably connected to the mounting bracket 2 via a vertical third guide rail 55. The mounting bracket 2 is provided with an inner support flat steel 22, which is abutted against the lifting base frame 5 by a spring 23.

[0041] In this technical solution, the two ends of the longitudinal plate protrude from the sides of the corresponding transverse plate. The outer side of the protruding part of the longitudinal plate (the side closer to the corresponding column) is connected to the slider of the third guide rail by bolts, etc. The inner side (the side away from the corresponding column) is provided with a pressure plate corresponding to the spring. The inner support flat steel is installed on the mounting bracket by bolts, etc., and its top surface is connected to the guide rod by threaded connection, etc. The pressure plate is provided with a through hole corresponding to the guide rod. The spring is sleeved on the guide rod to prevent the spring from tilting and detaching from the pressure plate and the inner support flat steel. When the lifting base frame is at the bottom (when the upper and lower sealing knives are open), the spring is compressed to bear the weight of the lifting base frame and reduce the pressure on the cam and camshaft, etc. As the upper and lower sealing knives approach each other, the spring releases elastic potential energy, reducing the power requirement of the lifting motor.

[0042] For example, see Figures 2 to 7 as well as Figure 11 and Figure 12 As shown, the synchronous belt drive mechanism 64 includes a drive pulley 641 disposed on the drive shaft 61, driven pulleys 642 respectively sleeved on the camshaft 62, and a synchronous belt 643 that drives the drive pulley 641 and the two driven pulleys 642.

[0043] In this technical solution, a transverse reinforcing plate is connected between the two longitudinal plates of the lifting base frame, and a longitudinal reinforcing plate is connected between the transverse reinforcing plate and the horizontal plate. The cams on the camshaft are connected to the corresponding horizontal plates and transverse reinforcing plates through conventional hinge seats. The coaxial camshafts are connected by conventional rigid couplings. The lifting motor is mounted on the bottom of the mounting bracket through a conventional motor mounting plate. The transmission shaft is rotatably mounted on the top of the motor mounting plate through a conventional bearing seat, and its two ends are respectively connected to the output shaft of the lifting motor through gear transmission and to the camshaft driven by a synchronous belt transmission mechanism.

[0044] For example, see Figures 2 to 7 as well as Figure 11 and Figure 12 As shown, tensioning wheels 644 are respectively provided between the driving wheel 641 and the two driven wheels 642. The two ends of the rotating shaft of the tensioning wheel 644 are respectively set on the mounting bracket 2 through the mounting strip 645. The mounting strip 645 is provided with an adjusting threaded hole. The two ends of the rotating shaft of the tensioning wheel 644 are respectively connected to the corresponding adjusting threaded hole through the adjusting bolt 646. The adjusting bolt 646 is provided with a locking nut.

[0045] In this technical solution, the mounting strips are installed on the reinforcing plates inside the mounting bracket by bolts, etc. The tension of the synchronous belt is adjusted by adjusting the installation height of the tensioning wheel. The tensioning wheel is a conventional bearing wheel with mounting surfaces machined at both ends of its shaft. Through holes are machined along the radial direction of the shaft in the mounting surfaces. The adjusting bolt passes through the through holes in the shaft and connects to the adjusting threaded hole on the mounting strip. The adjusting bolt is equipped with two locking nuts. The upper locking nut is used to support the shaft of the tensioning wheel, and the lower locking nut is used to lock the adjusting bolt.

[0046] For example, see Figures 2 to 7 as well as Figure 11 and Figure 12 As shown, the two driven wheels 642 are equipped with two steering idler wheels 647. The installation height of the tension wheel 644 and the steering idler wheel 647 is higher than the installation height of the driven wheels 642.

[0047] In this technical solution, the steering idler pulley is used to change the direction of the synchronous belt. Together with the tensioner pulley, it ensures that the wrap angle between the synchronous belt and both the driving and driven pulleys is greater than 180°, reducing the risk of slippage. In addition, the installation height of the tensioner pulley is higher than that of the driven pulley. The steering idler pulley can avoid interference between the synchronous belts on both sides of the driven pulley. At the same time, through the setting of the steering idler pulley and the tensioner pulley, the direction of the gravity of both the driving and driven pulleys is directed towards the synchronous belt, thereby "holding" the driving and driven pulleys in place by the synchronous belt.

[0048] In summary, the longitudinal sealing mechanism of this bag making machine has a simple structure. The lifting motor synchronously drives multiple lower longitudinal sealing devices through the lifting base frame, improving the consistency of the lower longitudinal sealing device's operation. The upper and lower longitudinal sealing devices are slidably mounted on the mounting bracket and the lifting base frame, respectively, to meet the needs of adjusting the longitudinal sealing position.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0050] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A longitudinal sealing mechanism for a bag-making machine, characterized in that, The device includes a mounting bracket slidably mounted on the frame of a bag-making machine, several lower longitudinal sealing devices mounted on the mounting bracket via a drive frame, and several upper longitudinal sealing devices corresponding to the lower longitudinal sealing devices. The drive frame includes a lifting base frame slidably connected to the mounting bracket and a lifting motor that drives the lifting base frame via a transmission device. The transmission device includes a drive shaft and two camshafts. One end of the drive shaft is connected to the output shaft of the lifting motor via a gear transmission mechanism, and the other end is connected to the corresponding camshaft via a synchronous belt transmission mechanism. The camshafts are connected to the lifting base frame via several cam mechanisms.

2. The longitudinal sealing mechanism of the bag-making machine according to claim 1, characterized in that: The lower longitudinal sealing device includes a lower crossbeam slidably mounted on the lifting base frame via a first guide rail and a lower sealing knife mounted on the top of the lower crossbeam. The two ends of the lower crossbeam are respectively provided with a first bearing seat, and a first gear shaft is connected between the two first bearing seats. The end of the first gear shaft passes through the corresponding first bearing seat and is connected to a first gear. A first rack corresponding to the first gear is provided inside the lifting base frame.

3. The longitudinal sealing mechanism of the bag-making machine according to claim 2, characterized in that: The first rack is connected to the mounting bracket via a first locking bar. The top of the first locking bar is recessed with a T-shaped first locking groove. A first locking handle is provided on one side of the first bearing seat. A first locking block that slides in the first locking groove is provided on the stud of the first locking handle.

4. The longitudinal sealing mechanism of the bag-making machine according to claim 1, characterized in that: The upper longitudinal sealing device includes an upper crossbeam slidably connected to the mounting bracket and an upper sealing knife connected to the bottom end of the upper crossbeam. The upper crossbeam is provided with a lifting cylinder and a guide shaft connected to the upper sealing knife.

5. The longitudinal sealing mechanism of the bag-making machine according to claim 4, characterized in that: The two ends of the upper crossbeam are respectively connected to the mounting bracket via sliding plates. A rotating second gear shaft is connected between the two sliding plates. The sliding plates are slidably connected to the mounting bracket via a second guide rail. The two ends of the second gear shaft are respectively connected to second gears. A second rack corresponding to the second gear is provided inside the mounting bracket.

6. The longitudinal sealing mechanism of the bag-making machine according to claim 5, characterized in that: A second locking bar is provided on one side of the second guide rail. The second locking bar has a T-shaped second locking groove. A second locking handle is provided inside the sliding plate. A second locking block that slides in the second locking groove is provided on the stud of the second locking handle.

7. The longitudinal sealing mechanism of the bag-making machine according to claim 1, characterized in that: The lifting base frame is slidably connected to the mounting bracket via a vertical third guide rail. The mounting bracket is provided with an inner support flat steel, which is abutted against the lifting base frame by a spring.

8. The longitudinal sealing mechanism of the bag-making machine according to claim 1, characterized in that: The synchronous belt drive mechanism includes a driving pulley disposed on the drive shaft, driven pulleys respectively sleeved on the camshaft, and a synchronous belt connecting the driving pulley and the two driven pulleys.

9. The longitudinal sealing mechanism of the bag-making machine according to claim 8, characterized in that: Tensioning wheels are respectively provided between the driving wheel and the two driven wheels. The two ends of the shaft of the tensioning wheel are respectively set to the mounting bracket by mounting strips. The mounting strips are provided with adjusting threaded holes. The two ends of the shaft of the tensioning wheel are respectively connected to the corresponding adjusting threaded holes by adjusting bolts. Locking nuts are provided on the adjusting bolts.

10. The longitudinal sealing mechanism of the bag-making machine according to claim 9, characterized in that: The two driven wheels are provided with two steering idler wheels, and the installation height of the tension wheel and the steering idler wheels is higher than the installation height of the driven wheels.

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