Longitudinal sealing mechanism of bag making machine

Abstract

The longitudinal sealing mechanism of the bag making machine comprises a machine frame and a plurality of longitudinal sealing devices arranged in the machine frame in a sliding mode, and each longitudinal sealing device comprises an upper longitudinal sealing unit and a lower longitudinal sealing unit which are oppositely arranged. The upper longitudinal sealing unit comprises an upper mounting frame connected to the rack in a sliding mode, an upper lifting frame connected to the upper mounting frame in a sliding mode, an upper sealing cutter device arranged on the upper lifting frame in a sliding mode and an upper driving mechanism connected to the upper lifting frame. The upper driving mechanism comprises an upper servo motor arranged on the upper mounting frame, a first lead screw and a second lead screw, the first lead screw and the second lead screw are connected to the upper servo motor, and the lower longitudinal sealing unit comprises a lower mounting frame connected to the rack in a sliding mode, a lower sealing cutter device connected to the lower mounting frame in a sliding mode and a lower driving mechanism connected to the lower lifting frame. The lower driving mechanism comprises a lower servo motor arranged on the lower mounting frame, a third lead screw and a fourth lead screw, wherein the third lead screw and the fourth lead screw are connected to the lower servo motor. According to the longitudinal sealing mechanism, the stroke ranges of the upper sealing cutter device and the lower sealing cutter device are increased.

Description

Technical Field

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

[0002] A bag-making machine is a machine that produces various packaging bags. In existing packaging bag manufacturing processes, hot sealing is an indispensable step. This hot sealing process requires the bag-making machine to have at least one hot sealing device. In existing bag-making machine hot sealing equipment, some use cylinders to drive the longitudinal sealing equipment, which can easily lead to unstable sealing pressure during the transverse sealing process, potentially causing quality inconsistencies in the sealed bags. Others use a cam-driven structure, which has limited reciprocating stroke. Even when not in hot sealing operation, if the hot sealing equipment is too close to the film or packaging bag, it can cause thermal deformation of the film or packaging bag. 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 solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A longitudinal sealing mechanism for a bag-making machine includes a horizontally arranged frame and a plurality of longitudinal sealing devices slidably disposed within the frame. Each longitudinal sealing device includes an upper longitudinal sealing unit and a lower longitudinal sealing unit arranged opposite to each other. The upper longitudinal sealing unit includes an upper mounting frame slidably connected to the frame, an upper lifting frame slidably connected to the upper mounting frame, an upper sealing knife device slidably disposed on the upper lifting frame, and an upper drive mechanism driven by the upper lifting frame. The upper drive mechanism includes an upper servo motor disposed on the upper mounting frame and a first lead screw and a second lead screw driven by the upper servo motor. The lower longitudinal sealing unit includes a lower mounting frame slidably connected to the frame, a lower lifting frame slidably connected to the lower mounting frame, a lower sealing knife device disposed on the lower lifting frame, and a lower drive mechanism driven by the lower lifting frame. The lower drive mechanism includes a lower servo motor disposed on the lower mounting frame and a third lead screw and a fourth lead screw driven by the lower servo motor.

[0006] Furthermore, in the longitudinal sealing mechanism of the bag making machine, the two ends of the frame are respectively provided with an inlet and an outlet for film material entry and exit. The upper and lower ends of the inner side of the frame near the inlet are respectively provided with racks corresponding to the upper and lower longitudinal sealing units. The upper mounting frame and the lower mounting frame are respectively connected to the corresponding racks by gear drive, and are respectively slidably connected to the longitudinal sealing frame by the first guide rail.

[0007] Furthermore, in the longitudinal sealing mechanism of the bag making machine described above, the inlet and outlet are respectively equipped with height adjustment mechanisms. The height adjustment mechanism includes two parallel adjustment bars, and the two ends of the adjustment bars are respectively connected to the machine frame through adjustment studs.

[0008] Furthermore, in the longitudinal sealing mechanism of the bag making machine described above, the upper servo motor is mounted on the upper mounting frame via a first motor base, the lead screw of the first lead screw is rotatably connected to the upper mounting frame via a first bearing seat and connected to the output shaft of the upper servo motor, the nut of the first lead screw is disposed on the upper lifting frame, and the lead screw of the second lead screw is rotatably connected to the upper mounting frame via a second bearing seat and connected to the output shaft of the upper servo motor via a first synchronous belt.

[0009] Furthermore, in the longitudinal sealing mechanism of the bag making machine described above, the upper sealing knife device includes an upper hot sealing knife and an upper cold sealing knife. The upper hot sealing knife and the upper cold sealing knife are slidably connected to the upper lifting frame via connecting rods, and springs are respectively provided between the upper lifting frame and the upper hot sealing knife and the upper cold sealing knife.

[0010] Furthermore, in the longitudinal sealing mechanism of the bag making machine described above, one end of the connecting rod protrudes from a limiting boss and is embedded in the upper heat sealing knife or upper cold sealing knife, while the other end slides through the upper lifting frame. The upper lifting frame is provided with a linear bearing corresponding to the connecting rod, and the end of the connecting rod near the linear bearing is machined with an external thread and connected to an adjusting nut.

[0011] Furthermore, in the longitudinal sealing mechanism of the bag making machine described above, the lower sealing knife device includes a lower hot sealing knife and a lower cold sealing knife respectively provided for the upper hot sealing knife and the upper cold sealing knife.

[0012] Furthermore, in the longitudinal sealing mechanism of the bag making machine described above, the lower servo motor is mounted on the lower mounting frame via a second motor mount, the lead screw of the third lead screw is rotatably connected to the lower mounting frame via a third bearing seat and connected to the output shaft of the lower servo motor, the nut of the third lead screw is disposed on the lower lifting frame, and the lead screw of the fourth lead screw is rotatably connected to the lower mounting frame via a fourth bearing seat and connected to the output shaft of the lower servo motor via a second synchronous belt.

[0013] Furthermore, the longitudinal sealing mechanism of the bag making machine also includes two sets of ironing cloth mounting mechanisms disposed on both sides of the frame perpendicular to the feed inlet and the discharge outlet, and the two sets of ironing cloth mounting mechanisms are respectively disposed corresponding to the upper sealing knife device and the lower sealing knife device.

[0014] Furthermore, in the longitudinal sealing mechanism of the aforementioned bag-making machine, the hot-pressing cloth mounting mechanism includes two rotating shafts and two steering shafts respectively rotatably disposed on both sides of the machine frame.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This utility model has a compact structure. The upper and lower longitudinal sealing units are driven by servo motors, which increases the distance between the upper and lower sealing knife devices and reduces their impact on the packaging bag / film. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the longitudinal sealing mechanism of a bag-making machine in a specific embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the drive of the upper vertical sealing unit in a specific embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram showing the positions of the upper mounting frame and the upper lifting frame in a specific embodiment of this utility model.

[0020] Figure 4 This is a schematic diagram showing the connection between the upper mounting frame and the upper lifting frame in a specific embodiment of this utility model.

[0021] Figure 5 This is a schematic diagram showing the connection between the lower mounting frame and the lower lifting frame in a specific embodiment of this utility model.

[0022] Figure 6 This is a schematic diagram of the installation of the height adjustment mechanism and the ironing cloth mounting mechanism in a specific embodiment of this utility model.

[0023] Figure 7 This is an enlarged schematic diagram of the height adjustment mechanism in a specific embodiment of the present invention.

[0024] Figure 8 This is an enlarged schematic diagram of the ironing cloth mounting mechanism in a specific embodiment of this utility model. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Reference Figures 1 to 8As shown, a longitudinal sealing mechanism for a bag-making machine includes a horizontally arranged frame 1 and several longitudinal sealing devices slidably arranged within the frame 1. Each longitudinal sealing device includes an upper longitudinal sealing unit and a lower longitudinal sealing unit arranged opposite to each other. The upper longitudinal sealing unit includes an upper mounting frame 2 slidably connected to the frame 1, an upper lifting frame 3 slidably connected to the upper mounting frame 2, an upper sealing knife device 4 slidably arranged on the upper lifting frame 3, and an upper driving mechanism 5 driven and connected to the upper lifting frame 3. The upper driving mechanism 5 includes an upper servo motor arranged on the upper mounting frame 2 and a first lead screw 51 and a second lead screw 52 driven and connected to the upper servo motor. The lower longitudinal sealing unit includes a lower mounting frame 6 slidably connected to the frame 1, a lower lifting frame 7 slidably connected to the lower mounting frame 6, a lower sealing knife device 8 arranged at the top of the lower lifting frame 7, and a lower driving mechanism 9 driven and connected to the lower lifting frame 7. The lower driving mechanism 9 includes a lower servo motor arranged on the lower mounting frame 6 and a third lead screw 91 and a fourth lead screw 92 driven and connected to the lower servo motor.

[0027] In this technical solution, the frame is a frame structure, which can be installed independently on the bag-making machine line or integrated with the bag-making machine line. One or more longitudinal sealing devices are installed on the hot-pressing process of the bag-making machine via the frame to complete the longitudinal sealing and hot-pressing of the packaging bags. Both the upper and lower longitudinal sealing units are horizontally arranged, with the upper longitudinal sealing unit positioned directly above the lower longitudinal sealing unit. After the film or packaging bag requiring heat sealing is fed between the upper and lower longitudinal sealing units by the bag-making machine, the upper and lower servo motors start, driving the upper and lower lifting frames respectively. The upper and lower sealing devices move relative to each other and act on the surface of the film or packaging bag to complete the heat sealing. After the heat sealing is completed, the upper and lower servo motors rotate in opposite directions, driving the upper and lower sealing devices away from the film and packaging bag through the upper and lower lifting frames, respectively. Compared with transmission structures such as cams, this increases the stroke range of the upper and lower sealing devices, that is, increases the distance between the upper and lower sealing devices and the film or packaging bag, and reduces the impact of the upper and lower sealing devices on the film / packaging bag during travel or in non-heat-sealed areas.

[0028] For example, see Figure 1 and Figure 2 as well as Figure 5 and Figure 6 As shown, the two ends of the frame 1 are respectively provided with a feed port and a discharge port for the film material to enter and exit. The upper and lower ends of the inner side of the frame 1 near the feed port are respectively provided with racks 10 corresponding to the upper and lower longitudinal sealing units. The upper mounting frame 2 and the lower mounting frame 6 are respectively driven to the corresponding racks 10 by gears 20, and are respectively slidably connected to the longitudinal sealing frame 1 by the first guide rail 30.

[0029] In this technical solution, the film / packaging bag moves along the direction from the inlet to the outlet. The upper and lower longitudinal sealing units move in a direction perpendicular to the direction of travel of the film / packaging bag to meet the longitudinal sealing requirements of different types of packaging bags. The first guide rail is a conventional linear guide rail and is installed on the frame by bolts, etc. The upper and lower longitudinal sealing units are respectively connected to the sliders of the corresponding first guide rail by bolts, etc., so as to slide on the frame. Two racks are also installed on the frame by bolts, respectively above the upper longitudinal sealing unit and below the lower longitudinal sealing unit. L-shaped brackets are respectively installed on the upper mounting frame near the top of the corresponding rack and the lower mounting frame near the bottom of the rack, and gears meshing with the corresponding racks are rotatably installed. The L-shaped brackets are also equipped with a conventional third servo motor. The third servo motor is fixed to the L-shaped bracket by bolts, and its output shaft is connected to the corresponding gear, so as to automatically adjust the position of the upper and lower longitudinal sealing units on the frame to meet the longitudinal sealing requirements of different positions.

[0030] For example, see Figure 1 , Figure 6 and Figure 7 As shown, the feed inlet and the discharge outlet are respectively equipped with height adjustment mechanisms 40. The height adjustment mechanism includes two parallel adjustment bars 401, and the two ends of the adjustment bars are respectively connected to the frame 1 through adjustment studs 402.

[0031] In this technical solution, the adjusting studs are respectively mounted on the frame via the first mounting block. The bottom end of the adjusting bolt is connected to the first mounting block via conventional mounting bolts. The two ends of the adjusting strip are respectively set to the adjusting studs via threaded connections. Loosening the mounting bolts of the adjusting studs and rotating the studs can adjust the installation height of the adjusting strips, thereby adjusting the height of the film / packaging bag. The gap formed between the two adjusting strips allows the film / packaging bag to pass through. To reduce the contact between the adjusting strips and the film / packaging bag, a clearance groove is machined in the end face of the adjusting strip near the film / packaging bag.

[0032] For example, see Figures 1 to 4 As shown, the upper servo motor is mounted on the upper mounting frame 2 via the first motor base 53. The lead screw of the first lead screw 51 is rotatably connected to the upper mounting frame 2 via the first bearing seat 54 and connected to the output shaft of the upper servo motor. The nut of the first lead screw 51 is set on the upper lifting frame 3. The lead screw of the second lead screw 52 is rotatably connected to the upper mounting frame 2 via the second bearing seat 55 and connected to the output shaft of the upper servo motor via the first synchronous belt.

[0033] In this technical solution, the first motor base is a conventional structure and is installed on the top of the upper mounting frame using conventional bolts. The upper servo motor is an existing servo motor and is installed on the top of the first motor base using conventional devices such as bolts. Its output shaft is connected to the corresponding end of the lead screw in the first lead screw via a coupling. The first bearing housing is an existing structure and is fixed to the top plate using bolts. Its internal ends are respectively equipped with two bearing groups consisting of deep groove ball bearings and thrust ball bearings. The end of the lead screw in the first lead screw near the coupling is axially limited to the corresponding bearing group by conventional devices such as locking nuts, and the other end is axially limited to the corresponding bearing group by its own shaft shoulder and other structures. The first bearing housing and the bearing groups inside it enable the lead screw of the first lead screw to rotate and connect to the upper mounting frame. The second lead screw pair has the same structure as the first lead screw pair and is equipped with synchronous pulleys via conventional tensioning sleeves. The two synchronous pulleys are connected by a first synchronous belt, thereby synchronously driving the first lead screw pair and the second lead screw pair to move, driving the upper lifting frame and the upper sealing knife device to rise and fall.

[0034] For example, see Figures 1 to 4 As shown, the upper sealing knife device 4 includes an upper hot sealing knife 41 and an upper cold sealing knife 42. The upper hot sealing knife 41 and the upper cold sealing knife 42 are slidably connected to the upper lifting frame 3 via connecting rods 50. Springs (not shown) are respectively provided between the upper lifting frame 3 and the upper hot sealing knife 41 and the upper cold sealing knife 42.

[0035] In this technical solution, the upper lifting frame includes a top plate, two side plates, and two end plates, forming a cavity with an open bottom. The outer walls of the two end plates are slidably connected to the upper mounting frame via second guide rails. The upper heat sealing knife and upper cold sealing knife are conventional structures and will not be described in detail here. They are slidably connected to the upper lifting frame via their respective mounting seats. The top of the mounting seat slides within the cavity of the upper lifting frame and is connected to the top plate via connecting rods. Two connecting rods are symmetrically arranged on both sides of the first and second lead screws to ensure the stability of the mounting seat connection. The bottom surface of the top plate is provided with T-shaped positioning posts via bolts, etc. The top surface of the mounting seat is recessed with positioning grooves. Conventional rectangular helical springs are used, and both ends are respectively sleeved on the T-shaped positioning posts and embedded in the positioning grooves to prevent the springs from falling off or tilting. When the upper lifting frame descends, the upper heat sealing knife and upper cold sealing knife are pressed down by the springs, and the upper heat sealing knife and upper cold sealing knife are in elastic contact with the film / packaging bag to protect the film / packaging bag.

[0036] For example, see Figures 1 to 4 As shown, one end of the connecting rod 50 protrudes from a limiting boss and is embedded in the mounting base of the upper heat sealing knife or the upper cold sealing knife. The other end slides through the upper lifting frame 3. The upper lifting frame 3 is provided with a linear bearing 60 corresponding to the connecting rod 50. The end of the connecting rod 50 near the linear bearing is machined with an external thread and connected with an adjusting nut.

[0037] In this technical solution, the mounting base has a connecting hole corresponding to the connecting rod. The bottom of the inner wall of the connecting hole is provided with a limiting groove corresponding to the limiting boss. The outer wall of the connecting rod, which is located between the linear bearing and the mounting base, is machined with external threads. The connecting rod is axially fixed to the mounting base by the cooperation of the fixing nut and the limiting boss. The linear bearing uses conventional bearing housings and oil-impregnated bearings, and is fixed to the top plate by conventional bolts. The connecting rod is slidably set in the linear bearing. The installation height of the connecting rod is adjusted by adjusting the nut, thereby adjusting the height of the upper heat sealing knife and the upper cold sealing knife, ensuring the parallelism between the upper heat sealing knife and the upper cold sealing knife and the lower heat sealing knife and the lower cold sealing knife. To prevent the connecting rod from rotating, the inner wall of the limiting groove and the outer wall of the limiting boss are machined with anti-rotation planes.

[0038] For example, see Figure 1 and Figure 4 As shown, the lower sealing knife device 8 includes a lower hot sealing knife 81 and a lower cold sealing knife 82 respectively provided with an upper hot sealing knife 41 and an upper cold sealing knife 42.

[0039] In this technical solution, both the lower heat sealing knife and the lower cold sealing knife are conventional structures, which will not be described in detail here. They are set at the top of the lower lifting frame, with the heat sealing knife and the upper cold sealing knife spaced apart, and the lower heat sealing knife and the lower cold sealing knife spaced apart, to reduce heat transfer between the heat sealing knife and the upper cold sealing knife, as well as between the lower heat sealing knife and the lower cold sealing knife.

[0040] For example, see Figure 1 and Figure 5 As shown, the lower servo motor is mounted on the lower mounting frame 6 via the second motor mount 93. The lead screw of the third lead screw 91 is rotatably connected to the lower mounting frame 6 via the third bearing seat 94 and connected to the output shaft of the lower servo motor. The nut of the third lead screw 91 is located on the lower lifting frame 7. The lead screw of the fourth lead screw 92 is rotatably connected to the lower mounting frame 6 via the fourth bearing seat 95 and connected to the output shaft of the lower servo motor via the second synchronous belt.

[0041] In this technical solution, the structure in which the lower servo motor drives the lower lifting frame to rise and fall through the third and fourth lead screws is the same as the structure in which the upper servo motor drives the upper lifting frame to rise and fall through the first and second lead screws. The two ends of the lower lifting frame are respectively slidably connected to the lower mounting frame through conventional third guide rails. The lower lifting frame directly drives the lower heat sealing knife and the lower cold sealing knife to rise and fall.

[0042] For example, see Figure 1 , Figure 6 and Figure 8 As shown, it also includes two sets of ironing cloth mounting mechanisms 60 disposed on both sides of the frame 1 perpendicular to the feed inlet and the discharge outlet. The two sets of ironing cloth mounting mechanisms 60 are respectively disposed corresponding to the upper sealing knife device and the lower sealing knife device.

[0043] In this technical solution, the ironing cloth is installed in the bracket through the ironing cloth installation mechanism, without interfering with the height adjustment mechanism. The ironing cloth is not moved separately in the upper or lower longitudinal sealing unit, but acts on all the upper or lower longitudinal sealing units simultaneously. The upper or lower longitudinal sealing unit only contacts the ironing cloth during the sealing operation. During the interval of the ironing operation, after the upper or lower longitudinal sealing unit moves and resets, it does not contact the ironing cloth, thus avoiding the ironing cloth being in a high-temperature state for a long time and extending its service life.

[0044] For example, see Figure 1 , Figure 6 and Figure 8 As shown, the ironing cloth mounting mechanism 60 includes two rotating shafts 601 and two steering shafts 602 respectively rotatably disposed on both sides of the frame 1.

[0045] In this technical solution, the two ends of the rotating shaft and the steering shaft are respectively mounted on the frame via second mounting blocks. The rotating shaft is a hexagonal bar structure, and its two ends are rotatably set on the corresponding second mounting blocks through conventional clearance fits, bushings, or bearings. One end of the rotating shaft is connected to a conventional cross handle for easy hand operation. One end of the ironing cloth is wound around a rotating shaft, and the other end passes through two steering shafts in sequence before being wound around another rotating shaft, thereby positioning the ironing cloth below all upper longitudinal sealing units or above all lower longitudinal sealing units. A gap is left between the two ironing cloths to accommodate the film / packaging bag. The position of the ironing cloth can be rotated by rotating the two rotating shafts in the same direction, which is convenient for operation.

[0046] In summary, this utility model has a compact structure. The upper and lower longitudinal sealing units are driven by servo motors, which increases the distance between the upper and lower sealing knife devices and reduces their impact on the packaging bag / film.

[0047] 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.

[0048] 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 horizontally arranged frame and several longitudinal sealing devices slidably disposed within the frame. Each longitudinal sealing device comprises an upper longitudinal sealing unit and a lower longitudinal sealing unit arranged opposite to each other. The upper longitudinal sealing unit includes an upper mounting frame slidably connected to the frame, an upper lifting frame slidably connected to the upper mounting frame, an upper sealing knife device slidably disposed on the upper lifting frame, and an upper drive mechanism driven by the upper lifting frame. The upper drive mechanism includes an upper servo motor disposed on the upper mounting frame and a first lead screw and a second lead screw driven by the upper servo motor. The upper servo motor is mounted on the upper mounting frame via a first motor mount, and the lead screw of the first lead screw rotates through a first bearing seat. The first lead screw is movably connected to the upper mounting frame and connected to the output shaft of the upper servo motor. The lead screw nut of the first lead screw is disposed on the upper lifting frame. The lead screw of the second lead screw is rotatably connected to the upper mounting frame through the second bearing seat and connected to the output shaft of the upper servo motor through the first synchronous belt. The lower longitudinal sealing unit includes a lower mounting frame slidably connected to the frame, a lower lifting frame slidably connected to the lower mounting frame, a lower sealing knife device disposed on the lower lifting frame, and a lower drive mechanism driven and connected to the lower lifting frame. The lower drive mechanism includes a lower servo motor disposed on the lower mounting frame and a third lead screw and a fourth lead screw driven and connected to the lower servo motor.

2. The longitudinal sealing mechanism of a bag-making machine according to claim 1, characterized in that, The frame is provided with an inlet and an outlet for the film material to enter and exit at both ends. Inside the frame, near the inlet, the upper and lower ends are provided with racks corresponding to the upper and lower longitudinal sealing units. The upper and lower mounting frames are connected to the corresponding racks by gear drive and are slidably connected to the longitudinal sealing frame by the first guide rail.

3. The longitudinal sealing mechanism of a bag-making machine according to claim 2, characterized in that, The feed inlet and discharge outlet are respectively equipped with height adjustment mechanisms. The height adjustment mechanism includes two parallel adjustment bars, and the two ends of the adjustment bars are respectively connected to the frame through adjustment studs.

4. The longitudinal sealing mechanism of a bag-making machine according to claim 1, characterized in that, The upper sealing knife device includes an upper hot sealing knife and an upper cold sealing knife. The upper hot sealing knife and the upper cold sealing knife are slidably connected to the upper lifting frame via connecting rods. Springs are respectively provided between the upper lifting frame and the upper hot sealing knife and the upper cold sealing knife.

5. The longitudinal sealing mechanism of a bag-making machine according to claim 4, characterized in that, One end of the connecting rod protrudes from a limiting boss and is embedded in the upper heat sealing knife or upper cold sealing knife, while the other end slides through the upper lifting frame. The upper lifting frame is equipped with a linear bearing corresponding to the connecting rod. The end of the connecting rod near the linear bearing is machined with an external thread and connected to an adjusting nut.

6. The longitudinal sealing mechanism of a bag-making machine according to claim 4, characterized in that, The lower sealing knife device includes a lower hot sealing knife and a lower cold sealing knife respectively provided for the upper hot sealing knife and the upper cold sealing knife.

7. The longitudinal sealing mechanism of a bag-making machine according to claim 1, characterized in that, The lower servo motor is mounted on the lower mounting frame via a second motor mount. The lead screw of the third lead screw is rotatably connected to the lower mounting frame via a third bearing seat and is connected to the output shaft of the lower servo motor. The nut of the third lead screw is disposed on the lower lifting frame. The lead screw of the fourth lead screw is rotatably connected to the lower mounting frame via a fourth bearing seat and is connected to the output shaft of the lower servo motor via a second synchronous belt.

8. The longitudinal sealing mechanism of a bag-making machine according to claim 2, characterized in that, It also includes two sets of ironing cloth mounting mechanisms disposed on both sides of the frame perpendicular to the feed inlet and the discharge outlet, and the two sets of ironing cloth mounting mechanisms are respectively disposed corresponding to the upper sealing knife device and the lower sealing knife device.

9. The longitudinal sealing mechanism of a bag-making machine according to claim 8, characterized in that, The ironing cloth mounting mechanism includes two rotating shafts and two steering shafts respectively rotatably mounted on both sides of the frame.

Images