A longitudinal sealing mechanism

Abstract

This utility model discloses a longitudinal sealing mechanism, including a mounting plate on which a film clamping assembly, a heat sealing assembly, and a film pulling assembly are mounted. The film clamping assembly includes a film clamping drive and a film clamping unit; the heat sealing assembly includes a heat sealing drive and a heat sealing unit; and the film pulling assembly includes a film pulling drive and a film pulling unit. The film clamping drive and the film pulling drive are connected by a belt drive, and the film clamping drive and the heat sealing drive are connected by a gear set. By setting the film clamping assembly next to the heat sealing assembly, when the packaging machinery stops waiting for material and the driven heat sealing wheel is opened by a cylinder, the driving wheel and the driven wheel in the film clamping assembly can stably clamp the packaging film, effectively preventing the packaging film from sagging and falling due to gravity. In addition, the components are connected by belt and gear sets, realizing synchronous power transmission from a single power source, eliminating the need for a separate drive device, reducing manufacturing costs and maintenance difficulty.

Description

Technical Field

[0001] This utility model relates to the field of packaging equipment technology, and more specifically, to a longitudinal sealing mechanism. Background Technology

[0002] In the operation of packaging machinery, the packaging film is typically fed by film-pulling rollers and then heat-sealed by heat-sealing rollers to complete the packaging process. However, in actual production, there are periods where the packaging film stops moving forward due to waiting for materials.

[0003] In existing technologies, to prevent the high-temperature heat-sealing roller from scalding the packaging film when it stops moving forward, the heat-sealing roller is usually opened to separate it from the packaging film. However, during this process, because the packaging film loses its forward momentum and effective support, it is prone to sagging under its own weight, leading to film detachment. After detachment, operators need to re-thread and adjust the film, which not only affects packaging efficiency but may also waste packaging film and increase production costs. Utility Model Content

[0004] This utility model provides a longitudinal sealing mechanism to solve the problems mentioned in the background art. To achieve the above objective, this utility model provides the following technical solution: A longitudinal sealing mechanism includes a mounting plate, on which a film clamping assembly, a heat sealing assembly, and a film pulling assembly are provided; the film clamping assembly includes a film clamping transmission part and a film clamping unit, the heat sealing assembly includes a heat sealing transmission part and a heat sealing unit, and the film pulling assembly includes a film pulling transmission part and a film pulling unit; the film clamping transmission part and the film pulling transmission part are connected by belt drive, and the film clamping transmission part and the heat sealing transmission part are connected by gear set drive; the film clamping unit, the heat sealing unit, and the film pulling unit are arranged sequentially along the conveying direction of the packaging film; the film clamping unit and the film pulling unit are respectively used to pull the packaging film forward; the heat sealing unit includes an active heat sealing wheel, a driven heat sealing wheel, and a cylinder, the cylinder being used to drive the driven heat sealing wheel to move towards or away from the active heat sealing wheel.

[0005] Preferably, the heat sealing unit further includes a front mounting base and a rear mounting base. The rear mounting base is provided with a pair of parallel sliding rods, and the ends of the sliding rods are provided with connecting plates. The front mounting base is slidably connected to the sliding rods. The cylinder body of the cylinder is connected to the connecting plate, and its piston rod is connected to the front mounting base. The driven heat sealing wheel is provided with a driven shaft, which is rotatably mounted on the front mounting base. The top of the driven shaft is provided with a driven gear. The driving heat sealing wheel is provided with a driving shaft, which is rotatably mounted on the rear mounting base. The driving shaft is provided with a first bevel gear and a driving gear, and the driving gear meshes with the driven gear. The heat-sealing transmission unit includes a heat-sealing bearing seat and a heat-sealing transmission shaft. One end of the heat-sealing bearing seat is connected to the rear mounting base, and the other end is connected to the mounting plate. The heat-sealing transmission shaft is rotatably mounted on the heat-sealing bearing seat. One end of the heat-sealing transmission shaft is provided with a second bevel gear, which meshes with the first bevel gear.

[0006] Preferably, the front mounting base is provided with a pair of limiting rods, which are threadedly connected to the front mounting base; the ends of the limiting rods are provided with buffer pads, which are positioned towards the rear mounting base.

[0007] Preferably, the bottom of the front mounting base is provided with a front clamping plate, and the bottom of the rear mounting base is provided with a rear clamping plate; the front clamping plate includes a front L-shaped plate and a front bottom plate, the front L-shaped plate is connected to the front mounting base, and the front bottom plate is located at the bottom of the front L-shaped plate; the rear clamping plate includes a rear L-shaped plate and a rear bottom plate, the rear L-shaped plate is connected to the rear mounting base, and the rear bottom plate is located at the bottom of the rear L-shaped plate; the front bottom plate and the rear bottom plate are arranged opposite to each other.

[0008] Preferably, the gear set includes a first transmission gear and a second transmission gear, the first transmission gear being connected to the heat-sealing transmission shaft, the second transmission gear being connected to the film clamping transmission part, and the first transmission gear meshing with the second transmission gear.

[0009] Preferably, the drive shaft is provided with a first brush assembly, and the driven shaft is provided with a second brush assembly; the drive heat sealing wheel is provided with a first heating element, and the driven heat sealing wheel is provided with a second heating element; the first heating element is electrically connected to the first brush assembly, and the second heating element is electrically connected to the second brush assembly.

[0010] Preferably, the structure of the film clamping unit is the same as that of the film stretching unit. The film clamping unit includes a mounting frame, a driving wheel, a driven wheel, an eccentric shaft, and an adjusting rod. The driving wheel is rotatably mounted on the mounting frame. The driven wheel is rotatable with the eccentric shaft, and the eccentric shaft is rotatably connected to the mounting frame. The adjusting rod is connected to the eccentric shaft. The film clamping transmission part is connected to the driving wheel through a transmission connection.

[0011] Preferably, the film clamping transmission part includes a first bearing seat, a first transmission shaft, a third bevel gear, a fourth bevel gear, and a first conical wheel; the first bearing seat is respectively connected to the mounting bracket and the mounting plate, and the first transmission shaft is rotatably mounted on the first bearing seat; the third bevel gear and the first conical wheel are respectively located at both ends of the first transmission shaft, and the fourth bevel gear is connected to the driving wheel, and the third bevel gear meshes with the fourth bevel gear; The film stretching transmission unit includes a second bearing, a second transmission shaft, a fifth bevel gear, a sixth bevel gear, and a second conical wheel; one end of the second bearing is connected to the mounting plate, and the other end is connected to the film stretching unit; the second transmission shaft is rotatably mounted on the second bearing; the fifth bevel gear and the third bevel gear are respectively located at both ends of the second transmission shaft; the sixth bevel gear is connected to the film stretching unit, and the fifth bevel gear meshes with the sixth bevel gear; a drive gear is provided on the second transmission shaft, and the drive gear is used to connect an external drive motor; the first conical wheel and the second conical wheel are connected by the belt.

[0012] Preferably, the mounting plate is provided with a speed adjustment mechanism, which includes a speed adjustment lever, a speed adjustment lever seat, a speed adjustment wheel seat, and a speed adjustment wheel; the speed adjustment lever seat is connected to the mounting plate, and the speed adjustment lever is rotatably connected to the speed adjustment lever seat; the speed adjustment wheel seat is threadedly connected to the speed adjustment lever, and the speed adjustment wheel is rotatably mounted on the speed adjustment wheel seat; the speed adjustment wheel seat is provided with a screw, and the mounting plate is provided with an arc-shaped groove that mates with the screw; the speed adjustment wheel is provided with an annular groove that mates with the belt.

[0013] Preferably, it further includes a height adjustment mechanism, which includes a bearing seat, a lifting plate, an adjusting screw, and a pair of guide grooves; the pair of guide grooves are respectively provided on both sides of the mounting plate, and the mounting plate is slidably connected to the guide grooves; the lifting plate is connected to the mounting plate; one end of the adjusting screw is provided with an adjusting handwheel, and the other end is rotatably connected to the bearing seat; the adjusting screw and the lifting plate are threadedly connected.

[0014] Compared with existing technologies, the advantages of this invention are as follows: This invention has a reasonable design and simple structure. By setting a film clamping assembly next to the heat-sealing assembly, when the packaging machinery stops waiting for materials and the driven heat-sealing wheel is opened by the cylinder, the driving and driven wheels in the film clamping assembly can stably clamp the packaging film, effectively preventing the packaging film from sagging and falling due to gravity. This avoids the hassle of re-threading and adjusting the film, improves packaging efficiency, and reduces packaging film waste. Furthermore, by setting front and rear film clamping plates to move the packaging film, it can be moved away from the driving heat-sealing wheel when the machine is stopped waiting for materials, preventing it from being burned. The film clamping assembly, heat-sealing assembly, and film-pulling assembly of this invention are connected by belts and gear sets, realizing synchronous power transmission from a single power source. This eliminates the need for separate drive devices for each component, reducing equipment manufacturing costs and subsequent maintenance difficulties. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the longitudinal sealing mechanism according to an embodiment of the present utility model; Figure 2 This is a top view of the longitudinal sealing mechanism according to an embodiment of the present utility model; Figure 3 This is another structural view of the longitudinal sealing mechanism according to an embodiment of the present utility model; Figure 4 This is another structural view of the longitudinal sealing mechanism according to an embodiment of the present utility model; Figure 5 This is a cross-sectional view of the film clamping unit of the longitudinal sealing mechanism according to an embodiment of the present utility model; Figure 6 This is a cross-sectional view of the heat sealing unit of the longitudinal sealing mechanism according to an embodiment of the present utility model; Figure 7 This is a cross-sectional view of the film-pulling unit of the longitudinal sealing mechanism according to an embodiment of the present invention; exist Figures 1 to 7 In the diagram, the correspondence between the component names and the drawing numbers is as follows: 1--Mounting plate, 11--Arc groove, 2--Film clamping assembly, 21--Film clamping transmission unit, 211--First shaft seat, 212--First transmission shaft, 213--Third bevel gear, 214--Fourth bevel gear, 215--First conical wheel, 22--Film clamping unit, 221--Mounting bracket, 222--Driving wheel, 223--Driven wheel, 224--Eccentric shaft, 225--Adjusting rod, 3--Heat sealing assembly, 31--Heat sealing transmission unit, 311--Heat sealing shaft 312--Heat-sealing drive shaft, 313--Second bevel gear, 32--Heat-sealing unit, 321--Driving heat-sealing wheel, 322--Driven heat-sealing wheel, 323--Cylinder, 324--Front mounting seat, 325--Rear mounting seat, 326--Slide rod, 327--Connecting plate, 328--Driven shaft, 329--Driven gear, 3210--Drive shaft, 3211--First bevel gear, 3212--Drive gear, 3213--Limit rod, 3214-- --Front clamping plate, 3214a--Front L-shaped plate, 3214b--Front bottom plate, 3215--Rear clamping plate, 3215a--Rear L-shaped plate, 3215b--Rear bottom plate, 3216--First brush assembly, 3217--Second brush assembly, 3218--First heating element, 3219--Second heating element, 4--Film stretching assembly, 41--Film stretching transmission unit, 411--Second shaft seat, 412--Second transmission shaft, 413--Fifth bevel gear, 41 4--Sixth bevel gear, 415--Second bevel gear, 416--Drive gear, 42--Membrane stretching unit, 5--Belt, 6--Gear set, 61--First transmission gear, 62--Second transmission gear, 7--Speed ​​adjustment mechanism, 71--Speed ​​control lever, 72--Speed ​​control lever seat, 73--Speed ​​control wheel seat, 74--Speed ​​control wheel, 75--Screw, 8--Height adjustment mechanism, 81--Bearing seat, 82--Lifting plate, 83--Adjusting screw, 84--Guide groove. Detailed Implementation

[0016] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. The following examples are used to illustrate this utility model, but should not be used to limit the scope of this utility model.

[0017] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] Please refer to Figures 1 to 7 This utility model provides a longitudinal sealing mechanism, including a mounting plate 1, on which a film clamping assembly 2, a heat sealing assembly 3, and a film pulling assembly 4 are provided; the film clamping assembly 2 includes a film clamping transmission part 21 and a film clamping unit 22, the heat sealing assembly 3 includes a heat sealing transmission part 31 and a heat sealing unit 32, and the film pulling assembly 4 includes a film pulling transmission part 41 and a film pulling unit 42. The film clamping transmission part 21 and the film pulling transmission part 41 are connected by a belt 5. The heat-sealing transmission units 31 are connected by a gear set 6; the film clamping unit 22, the heat-sealing unit 32, and the film pulling unit 42 are arranged sequentially along the conveying direction of the packaging film; the film clamping unit 22 and the film pulling unit 42 are respectively used to pull the packaging film forward; the heat-sealing unit 32 includes an active heat-sealing wheel 321, a driven heat-sealing wheel 322, and a cylinder 323, the cylinder 323 being used to drive the driven heat-sealing wheel 322 to move towards or away from the active heat-sealing wheel 321.

[0020] To address the issue of film falling off packaging machinery when it is stopped and waiting for materials, this embodiment incorporates a film clamping assembly 2. When the heat-sealing wheel is opened by the cylinder 323, the film clamping unit 22 in the film clamping assembly 2 can stably clamp the packaging film, providing reliable support. This prevents the packaging film from sagging and falling off due to gravity because it loses its grip at the heat-sealing assembly 3, thereby improving production continuity and packaging efficiency, reducing waste caused by film falling off, and lowering production material costs.

[0021] To ensure consistent movement between the film clamping assembly 2, the heat sealing assembly 3, and the film stretching assembly 4, and to prevent tearing or over-transportation of the packaging film due to asynchrony, this embodiment incorporates a belt drive structure 5 between the film clamping drive unit 21 and the film stretching drive unit 41. The flexible nature of the belt 5 effectively absorbs vibrations and impacts during transmission, resulting in smoother traction between the film clamping unit 22 and the film stretching unit 42, while reducing transmission noise. This design is suitable for production scenarios with high requirements for operational stability and working environment. The belt drive structure 5 is simple, easy to install, and facilitates subsequent maintenance and adjustment. The film clamping drive unit 21 and the heat sealing drive unit 31 are connected via a gear set 6. The high precision of gear meshing ensures accurate power transmission, guaranteeing a high degree of synchronization between the heat sealing unit 32 and the traction rhythm of the film clamping unit 22. This avoids quality problems such as heat sealing misalignment and packaging film stretching deformation caused by asynchrony between heat sealing and traction, further improving the precision and consistency of longitudinal sealing packaging. The complementary combination of the two transmission methods not only leverages the buffering and vibration absorption advantages of belt transmission 5, but also utilizes the high precision and high load-bearing capacity characteristics of gear transmission 6, enabling the entire mechanism to maintain stable performance under high-speed operation or frequent start-stop conditions, thus extending the service life of the equipment.

[0022] Furthermore, anti-slip patterns can be provided on the wheels of the film clamping unit 22 and the film pulling unit 42 to increase the friction between the film clamping unit 22, the film pulling unit 42 and the packaging film, and prevent the packaging film from slipping during clamping and pulling.

[0023] In this embodiment, the heat sealing assembly 3 is equipped with an active heat sealing wheel 321, a driven heat sealing wheel 322, and a drive cylinder 323. The cylinder 323 can flexibly drive the driven heat sealing wheel 322 to approach or move away from the active heat sealing wheel 321, thereby achieving precise adjustment of the heat sealing gap and adapting to the heat sealing requirements of packaging films of different thicknesses.

[0024] In this embodiment, the film clamping assembly 2, the heat sealing assembly 3, and the film stretching assembly 4 are all integrated on the mounting plate 1. The overall structure is compact and the layout is neat, which not only reduces the space occupied by the equipment, but also facilitates the daily inspection, debugging and maintenance by the operators.

[0025] The working process of this utility model is as follows: The film-pulling unit 42 of the film-pulling assembly 4 pulls the packaging film forward under the drive of the film-pulling transmission unit 41, and the film-clamping unit 22 of the film-clamping assembly 2 pulls synchronously; the power is transmitted from the film-pulling transmission unit 41 to the film-clamping transmission unit 21 via the belt 5, and then to the heat-sealing transmission unit 31 via the gear set 6, so that the heat-sealing unit 32 works in coordination with the traction action; the cylinder 323 drives the driven heat-sealing wheel 322 to approach the active heat-sealing wheel 321, and the active heat-sealing wheel 321 and the driven heat-sealing wheel 322 work together to longitudinally seal the packaging film; when waiting for material, the cylinder 323 drives the driven heat-sealing wheel 322 away from the active heat-sealing wheel 321 to prevent the film from being scalded, and the film-clamping unit 22 stably clamps the packaging film to prevent the film from sagging and falling due to gravity. After the waiting period ends, each component resumes its operation synchronously under the drive of the transmission system, restarting the packaging process.

[0026] Preferably, the heat sealing unit 32 further includes a front mounting base 324 and a rear mounting base 325. The rear mounting base 325 is provided with a pair of parallel sliding rods 326, and the ends of the sliding rods 326 are provided with connecting plates 327. The front mounting base 324 is slidably connected to the sliding rods 326. The cylinder body of the cylinder 323 is connected to the connecting plate 327, and its piston rod is connected to the front mounting base 324. The driven heat sealing wheel 322 is provided with a driven shaft 328, which is rotatably mounted on the front mounting base 324. The top of the driven shaft 328 is provided with a driven gear 329. The driving heat sealing wheel 321 is provided with a driving shaft 3210, which is rotatably mounted on the rear mounting base 325. The driving shaft 3210 is provided with a first bevel gear 3211 and a driving gear 3212, and the driving gear 3212 meshes with the driven gear 329. The heat-sealing transmission unit 31 includes a heat-sealing bearing seat 311 and a heat-sealing transmission shaft 312. One end of the heat-sealing bearing seat 311 is connected to the rear mounting base 325, and the other end is connected to the mounting plate 1. The heat-sealing transmission shaft 312 is rotatably mounted on the heat-sealing bearing seat 311. One end of the heat-sealing transmission shaft 312 is provided with a second bevel gear 313, which meshes with the first bevel gear 3211.

[0027] In this embodiment, the front mounting base 324 and the rear mounting base 325 are relatively slidably connected by a slide rod 326. The cylinder 323 and the slide rod 326 form an integral structure through a connecting plate 327. When the piston rod of the cylinder 323 acts on the rear front mounting base 324, it drives the front mounting base 324 to slide along the slide rod 326, thereby adjusting the distance between the driven heat sealing wheel 322 and the driving heat sealing wheel 321. External power drives the heat sealing drive shaft 312 to rotate. The second bevel gear 313 at the end of the heat sealing drive shaft 312 meshes with the first bevel gear 3211 on the driving shaft 3210, converting the horizontal power into the vertical power, driving the driving shaft 3210 and the driving heat sealing wheel 321 to rotate. The driving gear 3212 on the driving shaft 3210 meshes with the driven gear 329 at the top of the driven shaft 328, further driving the driven shaft 328 and the driven heat sealing wheel 322 to rotate synchronously in opposite directions, providing power for the heat sealing action. When the machine stops and is waiting for materials, the cylinder 323 drives the front mounting seat 324 away from the rear mounting seat 325. At this time, the driven heat sealing wheel 322 separates from the active heat sealing wheel 321 to avoid damage to the packaging film due to prolonged high temperature.

[0028] Preferably, the front mounting base 324 is provided with a pair of limiting rods 3213, which are threadedly connected to the front mounting base 324; the end of the limiting rod 3213 is provided with a buffer pad, which faces the rear mounting base 325. In this embodiment, the limiting rod 3213 is threadedly connected to the front mounting base 324, and its extension length can be adjusted by rotating the limiting rod 3213, thereby precisely limiting the extreme position of the sliding of the front mounting base 324 to the rear mounting base 325. This effectively prevents the piston rod of the cylinder 323 from extending excessively, causing a rigid collision between the driven heat sealing wheel 322 and the driving heat sealing wheel 321, and also protects the gear meshing structure of the heat sealing wheel from damage. The buffer pad at the end of the limiting rod 3213 can be made of elastic materials such as rubber or polyurethane, which plays a buffering role when the limiting rod 3213 contacts the rear mounting base 325.

[0029] Preferably, the bottom of the front mounting base 324 is provided with a front clamping plate 3214, and the bottom of the rear mounting base 325 is provided with a rear clamping plate 3215; the front clamping plate 3214 includes a front L-shaped plate 3214a and a front bottom plate 3214b, the front L-shaped plate 3214a is connected to the front mounting base 324, and the front bottom plate 3214b is located at the bottom of the front L-shaped plate 3214a; the rear clamping plate 3215 includes a rear L-shaped plate 3215a and a rear bottom plate 3215b, the rear L-shaped plate 3215a is connected to the rear mounting base 325, and the rear bottom plate 3215b is located at the bottom of the rear L-shaped plate 3215a; the front bottom plate 3214b and the rear bottom plate 3215b are arranged opposite to each other.

[0030] In this embodiment, the front clamping plate 3214 and the rear clamping plate 3215 are arranged opposite to each other, forming a film material guide channel through which the packaging film can pass. During operation, the packaging film passes between the front bottom plate 3214b and the rear bottom plate 3215b, and then enters the gap of the film pulling assembly 4. The front and rear clamping plates 3215 can guide the packaging film in the working state, preventing the film material from shifting during the conveying process. When the operation is stopped and waiting for materials, the front clamping plate 3214 moves away from the rear mounting plate 325 along with the front mounting base 324 under the action of the cylinder 323. At this time, the front clamping plate 3214 drives the packaging film closer to the rear bottom plate 3215b, thereby making the packaging film move away from the active heat sealing wheel 321, forming a certain gap, which can better protect the packaging film and prevent the packaging film from being damaged by the high temperature of the active heat sealing wheel 321.

[0031] Preferably, the gear set 6 includes a first transmission gear 61 and a second transmission gear 62. The first transmission gear 61 is connected to the heat-sealing drive shaft 312, and the second transmission gear 62 is connected to the film-clamping drive part 21. The first transmission gear 61 and the second transmission gear 62 mesh with each other. In this embodiment, the first transmission gear 61 and the second transmission gear 62 mesh with each other, and the rotation of the second transmission gear 62 will drive the first transmission gear 61 to rotate synchronously, thereby realizing the power linkage between the heat-sealing drive shaft 312 and the film-clamping drive part 21.

[0032] Preferably, the drive shaft 3210 is provided with a first brush assembly 3216, and the driven shaft 328 is provided with a second brush assembly 3217; the drive heat sealing wheel 321 is provided with a first heating element 3218, and the driven heat sealing wheel 322 is provided with a second heating element 3219; the first heating element 3218 is electrically connected to the first brush assembly 3216, and the second heating element 3219 is electrically connected to the second brush assembly 3217. In this embodiment, the heat sealing wheel is in a continuous rotating state during operation. Traditional wired power supply is prone to problems such as wire entanglement and breakage; while the brush assembly is a rotating power supply structure, which can rotate synchronously with the drive shaft 3210 and the driven shaft 328, always maintaining electrical connection with the heating element, and realizing uninterrupted power supply. The brush assembly is integrated on the drive shaft 3210 and the driven shaft 328, eliminating the need for additional external power supply lines, not occupying the surrounding space of the heat sealing unit 32, and resulting in a compact overall layout.

[0033] Preferably, the structure of the film clamping unit 22 is the same as that of the film stretching unit 42. The film clamping unit 22 includes a mounting frame 221, a driving wheel 222, a driven wheel 223, an eccentric shaft 224, and an adjusting rod 225. The driving wheel 222 is rotatably mounted on the mounting frame 221. The driven wheel 223 is rotatable with the eccentric shaft 224, and the eccentric shaft 224 is rotatably connected to the mounting frame 221. The adjusting rod 225 is connected to the eccentric shaft 224. The film clamping transmission part 21 is connected to the driving wheel 222 via a transmission connection. The working principle of this embodiment is as follows: when it is necessary to adjust the gap between the driving wheel 222 and the driven wheel 223, the adjusting rod 225 is operated. The adjusting rod 225 drives the eccentric shaft 224 to rotate, which in turn drives the driven wheel 223 below the eccentric shaft 224 to move closer to or away from the driving wheel 222, so that the distance between the driving wheel 222 and the driven wheel 223 meets the requirements of the packaging film. Furthermore, a locking structure can be set to lock and fix the eccentric shaft 224, making the driven wheel 223 more stable during the movement of the packaging film.

[0034] Preferably, the film clamping transmission unit 21 includes a first bearing 211, a first transmission shaft 212, a third bevel gear 213, a fourth bevel gear 214, and a first conical wheel 215; the first bearing 211 is respectively connected to the mounting bracket 221 and the mounting plate 1, and the first transmission shaft 212 is rotatably mounted on the first bearing 211; the third bevel gear 213 and the first conical wheel 215 are respectively located at both ends of the first transmission shaft 212, and the fourth bevel gear 214 is connected to the drive wheel 222 in a transmission manner, with the third bevel gear 213 meshing with the fourth bevel gear 214; The film stretching transmission unit 41 includes a second bearing 411, a second transmission shaft 412, a fifth bevel gear 413, a sixth bevel gear 414, and a second conical wheel 415. One end of the second bearing 411 is connected to the mounting plate 1, and the other end is connected to the film stretching unit 42. The second transmission shaft 412 is rotatably mounted on the second bearing 411. The fifth bevel gear 413 and the third bevel gear are respectively located at both ends of the second transmission shaft 412. The sixth bevel gear 414 is connected to the film stretching unit 42, and the fifth bevel gear 413 meshes with the sixth bevel gear 414. A drive gear 416 is provided on the second transmission shaft 412, and the drive gear 416 is used to connect an external drive motor. The first conical wheel 215 and the second conical wheel 415 are connected by the belt 5.

[0035] In this embodiment, an external drive motor meshes with the drive gear 416 of the film-pulling transmission unit 41. After the drive motor starts, it drives the drive gear 416 to rotate, thereby driving the second transmission shaft 412 to rotate around the second shaft seat 411. When the second transmission shaft 412 rotates, the fifth bevel gear 413 at its end rotates synchronously. The fifth bevel gear 413 meshes with the sixth bevel gear 414, converting horizontal power into vertical power and transmitting it to the film-pulling unit 42, driving the film-pulling unit 42 to perform the film-pulling action and realize the conveying of the packaging film. The second conical wheel 415 on the second transmission shaft 412 rotates synchronously with the shaft, driving the first conical wheel 215 of the film-clamping transmission unit 21 to rotate through the belt 5, thereby driving the first transmission shaft 212 to rotate around the first shaft seat 211. The third bevel gear 213 at the end of the first transmission shaft 212 meshes with the fourth bevel gear 214, transmitting power to the drive wheel 222, driving the drive wheel 222 to rotate to realize the film-clamping feeding action. The entire process is powered by the same drive motor, which is linked by belt 5 and driven by multiple bevel gears to achieve synchronous operation of the film stretching unit 42 and the film clamping drive wheel 222, ensuring that the film stretching speed matches the film clamping and feeding speed.

[0036] Preferably, the mounting plate 1 is provided with a speed adjustment mechanism 7, which includes a speed regulating rod 71, a speed regulating rod seat 72, a speed regulating wheel seat 73, and a speed regulating wheel 74; the speed regulating rod seat 72 is connected to the mounting plate 1, and the speed regulating rod 71 is rotatably connected to the speed regulating rod seat 72; the speed regulating wheel seat 73 is threadedly connected to the speed regulating rod 71, and the speed regulating wheel 74 is rotatably disposed on the speed regulating wheel seat 73; the speed regulating wheel seat 73 is provided with a screw 75, and the mounting plate 1 is provided with an arc-shaped groove 11 that cooperates with the screw 75; the speed regulating wheel 74 is provided with an annular groove that cooperates with the belt 5.

[0037] With the above structural design, operation only requires rotating the speed regulating lever 71. The speed regulating lever 71 drives the threaded speed regulating wheel seat 73 forward or backward, and the speed regulating wheel 74 moves synchronously with the forward or backward movement of the speed regulating wheel seat 73. The speed regulating wheel 74 acts as a guide. The ratio of the diameters of the belt 5 to the first conical pulley 215 and the second conical pulley 415 differs depending on the position of the speed regulating wheel 74. When the speed needs to be adjusted, the belt 5 is driven forward or backward on the first conical pulley 215 and the second conical pulley 415 via the speed regulating wheel 74. The second conical pulley 415 is connected to the power input end, thus allowing the speed of the first conical pulley 215 to increase or decrease according to the position of the belt 5.

[0038] Preferably, the system further includes a height adjustment mechanism 8, which includes a bearing seat 81, a lifting plate 82, an adjusting screw 83, and a pair of guide grooves 84. The pair of guide grooves 84 are respectively disposed on both sides of the mounting plate 1, and the mounting plate 1 is slidably connected to the guide grooves 84. The lifting plate 82 is connected to the mounting plate 1. One end of the adjusting screw 83 is provided with an adjusting handwheel, and the other end is rotatably connected to the bearing seat 81. The adjusting screw 83 is threadedly connected to the lifting plate 82.

[0039] In this embodiment, when the adjusting handwheel is rotated, the adjusting screw 83 rotates synchronously. The other end of the screw is rotatably connected to the bearing seat 81, ensuring that the screw rotates stably without displacement. Since the adjusting screw 83 is threadedly connected to the lifting plate 82, the rotational motion of the adjusting screw 83 is converted into the linear motion of the lifting plate 82 through the threaded engagement. The lifting plate 82 is fixedly connected to the mounting plate 1, and the two sides of the mounting plate 1 are slidably engaged with the guide groove 84. The guide groove 84 restricts the mounting plate 1 to move only in the vertical direction. Therefore, the lifting plate 82 drives the mounting plate 1 to slide up and down along the guide groove 84, ultimately realizing the height adjustment of the mounting plate 1 and the related components above it, such as the film clamping assembly 2, the heat sealing assembly 3, and the film stretching assembly 4.

[0040] Compared with existing technologies, the advantages of this invention are as follows: This invention has a reasonable design and simple structure. By setting a film clamping assembly next to the heat-sealing assembly, when the packaging machinery stops waiting for materials and the driven heat-sealing wheel is opened by the cylinder, the driving and driven wheels in the film clamping assembly can stably clamp the packaging film, effectively preventing the packaging film from sagging and falling due to gravity. This avoids the hassle of re-threading and adjusting the film, improves packaging efficiency, and reduces packaging film waste. Furthermore, by setting front and rear film clamping plates to move the packaging film, it can be moved away from the driving heat-sealing wheel when the machine is stopped waiting for materials, preventing it from being burned. The film clamping assembly, heat-sealing assembly, and film-pulling assembly of this invention are connected by belts and gear sets, realizing synchronous power transmission from a single power source. This eliminates the need for separate drive devices for each component, reducing equipment manufacturing costs and subsequent maintenance difficulties.

[0041] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A longitudinal sealing mechanism, characterized in that, The package includes an installation plate (1), on which a film clamping assembly (2), a heat sealing assembly (3), and a film pulling assembly (4) are provided. The film clamping assembly includes a film clamping drive unit (21) and a film clamping unit (22). The heat sealing assembly includes a heat sealing drive unit (31) and a heat sealing unit (32). The film pulling assembly includes a film pulling drive unit (41) and a film pulling unit (42). The film clamping drive unit and the film pulling drive unit are connected by a belt (5). The film clamping drive unit and the heat sealing drive unit are connected by a gear set (6). The film clamping unit, the heat sealing unit, and the film pulling unit are arranged sequentially along the conveying direction of the packaging film. The film clamping unit and the film pulling unit are used to pull the packaging film forward. The heat sealing unit includes an active heat sealing wheel (321), a driven heat sealing wheel (322), and a cylinder (323). The cylinder is used to drive the driven heat sealing wheel to move closer to or further away from the active heat sealing wheel.

2. The longitudinal sealing mechanism according to claim 1, characterized in that, The heat sealing unit further includes a front mounting base (324) and a rear mounting base (325). The rear mounting base is provided with a pair of parallel sliding rods (326), and the ends of the sliding rods are provided with connecting plates (327). The front mounting base and the sliding rods are slidably connected. The cylinder body of the cylinder is connected to the connecting plate, and its piston rod is connected to the front mounting base. The driven heat sealing wheel is provided with a driven shaft (328), which is rotatably mounted on the front mounting base. The top of the driven shaft is provided with a driven gear (329). The driving heat sealing wheel is provided with a driving shaft (3210), which is rotatably mounted on the rear mounting base. The driving shaft is provided with a first bevel gear (3211) and a driving gear (3212), and the driving gear meshes with the driven gear. The heat sealing drive unit includes a heat sealing bearing seat (311) and a heat sealing drive shaft (312). One end of the heat sealing bearing seat is connected to the rear mounting seat, and the other end is connected to the mounting plate. The heat sealing drive shaft is rotatably mounted on the heat sealing bearing seat. One end of the heat sealing drive shaft is provided with a second bevel gear (313), which meshes with the first bevel gear.

3. The longitudinal sealing mechanism according to claim 2, characterized in that, The front mounting base is provided with a pair of limiting rods (3213), which are threadedly connected to the front mounting base; the end of the limiting rod is provided with a buffer pad, which is positioned towards the rear mounting base.

4. The longitudinal sealing mechanism according to claim 3, characterized in that, The bottom of the front mounting base is provided with a front clamping plate (3214), and the bottom of the rear mounting base is provided with a rear clamping plate (3215). The front clamping plate includes a front L-shaped plate (3214a) and a front bottom plate (3214b). The front L-shaped plate is connected to the front mounting base, and the front bottom plate is located at the bottom of the front L-shaped plate. The rear clamping plate includes a rear L-shaped plate (3215a) and a rear bottom plate (3215b). The rear L-shaped plate is connected to the rear mounting base, and the rear bottom plate is located at the bottom of the rear L-shaped plate. The front bottom plate and the rear bottom plate are arranged opposite to each other.

5. The longitudinal sealing mechanism according to claim 2, characterized in that, The gear set includes a first transmission gear (61) and a second transmission gear (62). The first transmission gear is connected to the heat-sealing transmission shaft, and the second transmission gear is connected to the film clamping transmission part. The first transmission gear meshes with the second transmission gear.

6. The longitudinal sealing mechanism according to claim 2, characterized in that, The drive shaft is provided with a first brush assembly (3216), and the driven shaft is provided with a second brush assembly (3217); the drive heat sealing wheel is provided with a first heating element (3218), and the driven heat sealing wheel is provided with a second heating element (3219); the first heating element is electrically connected to the first brush assembly, and the second heating element is electrically connected to the second brush assembly.

7. The longitudinal sealing mechanism according to claim 1, characterized in that, The structure of the film clamping unit is the same as that of the film stretching unit. The film clamping unit includes a mounting frame (221), a drive wheel (222), a driven wheel (223), an eccentric shaft (224), and an adjusting rod (225). The drive wheel is rotatably mounted on the mounting frame. The driven wheel is rotatable with the eccentric shaft, and the eccentric shaft is rotatably connected to the mounting frame. The adjusting rod is connected to the eccentric shaft. The film clamping transmission unit is connected to the drive wheel.

8. The longitudinal sealing mechanism according to claim 7, characterized in that, The film clamping transmission unit includes a first bearing seat (211), a first transmission shaft (212), a third bevel gear (213), a fourth bevel gear (214), and a first conical wheel (215); the first bearing seat is connected to the mounting bracket and the mounting plate respectively, and the first transmission shaft is rotatably mounted on the first bearing seat; the third bevel gear and the first conical wheel are respectively located at both ends of the first transmission shaft, and the fourth bevel gear is connected to the drive wheel and meshes with the third bevel gear; The film-stretching transmission unit includes a second bearing seat (411), a second transmission shaft (412), a fifth bevel gear (413), a sixth bevel gear (414), and a second conical wheel (415); one end of the second bearing seat is connected to the mounting plate, and the other end is connected to the film-stretching unit; the second transmission shaft is rotatably mounted on the second bearing seat; the fifth bevel gear and the third bevel gear are respectively mounted at both ends of the second transmission shaft; the sixth bevel gear is connected to the film-stretching unit, and the fifth bevel gear meshes with the sixth bevel gear; a drive gear (416) is provided on the second transmission shaft, and the drive gear is used to connect an external drive motor; the first conical wheel and the second conical wheel are connected by the belt.

9. The longitudinal sealing mechanism according to claim 1, characterized in that, The mounting plate is provided with a speed adjustment mechanism (7), which includes a speed adjustment rod (71), a speed adjustment rod seat (72), a speed adjustment wheel seat (73), and a speed adjustment wheel (74). The speed adjustment rod seat is connected to the mounting plate, and the speed adjustment rod is rotatably connected to the speed adjustment rod seat. The speed adjustment wheel seat is threadedly connected to the speed adjustment rod, and the speed adjustment wheel is rotatably mounted on the speed adjustment wheel seat. The speed adjustment wheel seat is provided with a screw (75), and the mounting plate is provided with an arc-shaped groove (11) that cooperates with the screw. The speed adjustment wheel is provided with an annular groove that cooperates with the belt.

10. The longitudinal sealing mechanism according to any one of claims 1 to 9, characterized in that, It also includes a height adjustment mechanism (8), which includes a bearing seat (81), a lifting plate (82), an adjusting screw (83), and a pair of guide grooves (84); the pair of guide grooves are respectively provided on both sides of the mounting plate, and the mounting plate is slidably connected to the guide grooves; the lifting plate is connected to the mounting plate; one end of the adjusting screw is provided with an adjusting handwheel, and the other end is rotatably connected to the bearing seat; the adjusting screw and the lifting plate are threadedly connected.

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