A fully automatic heat shrink film packaging machine

Abstract

The invention discloses a fully automatic heat shrink film packaging machine, which belongs to the technical field of packaging equipment. A conveyor frame is arranged in the middle position of a heating chamber, the conveyor frame is used for conveying materials to be packaged, the heating chamber is used for heat-sealing the materials wrapped in the heat shrink film, a heat sealing component is arranged at one end of the heating chamber, the heat sealing component is used for heating the heat-sealed materials to shrink the heat shrink film, the heat sealing component comprises a first group of melting knives arranged in the material conveying direction and a second group of melting knives arranged perpendicularly to the first group of melting knives, the second group of melting knives is arranged on the heat sealing component at a position behind the material conveying direction, two melting knives form a group, and the two melting knives in the same group move towards each other to realize heat sealing, the first group of melting knives firstly heat-seals the heat shrink film, then drives the tightening component to tighten the heat shrink film in the width direction, and finally drives the second group of melting knives to perform heat sealing, and cleaning components are also arranged on the outer sides of the two groups of melting knives, which greatly improves the heat sealing quality.

Description

Technical Field

[0001] The invention relates to the technical field of packaging equipment, and in particular to a full-automatic heat shrink film packaging machine. Background Art

[0002] The heat shrink film packaging machine uses shrink film to wrap the outside of the product or package. After heating, the shrink film shrinks and wraps the product or package tightly, fully showing the appearance of the item, improving the product's sales performance, and increasing its beauty and value. The items packaged by the heat shrink machine can be sealed, moisture-proof, and pollution-proof, and protect the goods from external impacts. It has a certain buffering effect, especially when packaging fragile items, it can prevent the container from scattering when it is broken. In addition, it can reduce the possibility of product disassembly and theft.

[0003] After the conventional heat shrink film packaging machine is started, the feed motor drives the conveyor belt to operate, and the material is continuously fed into the packaging machine. The feed is detected by the photoelectric switch. After the photoelectric switch detects the material, it sends a signal to the PLC. According to the pre-programmed control program, the PLC sends a signal to the stacking solenoid valve that controls the stacking cylinder. The stacking solenoid valve coil is energized, the stacking solenoid valve is reversed, and the stacking cylinder performs the stacking action. After the stacking is completed, the PLC sends a signal to the melting knife solenoid valve that controls the melting knife cylinder. The melting knife solenoid valve coil is energized, the melting knife solenoid valve is reversed, and the melting knife cylinder performs the melting knife descending sealing action. After the sealing is completed, the product is sent to the heating device to realize the shrinking operation of the thermoplastic film.

[0004] The two sides of the existing heat shrink film packaging machine are heat-sealed at the same time, and the heat-sealed corners of the heat shrink film correspond to the corners of the product (especially the square shape). After shrinking, it cannot fit the outer surface of the product well, thereby forming hard spikes at the four corners of the product, which can easily scratch the user and also affect the appearance. At the same time, the existing melting knife is prone to have molten plastic adhered to the surface after a period of use, which will affect the sealing. Based on this, the present invention provides an automatic heat shrink film packaging machine, which tightens the heat shrink film in the width direction by arranging a tightening component to ensure that the heat shrink film can fit the product well when shrinking, and the cleaning component is capable of cleaning the melted plastic remaining on the melting knife. Summary of the invention

[0005] In view of the above technical problems, the technical solution adopted by the present invention is: a fully automatic heat shrink film packaging machine, including a conveying frame, a heating chamber and a heat sealing component, the conveying frame is arranged in the middle position of the heating chamber, the conveying frame is used to convey the material to be packaged, the heating chamber is used to heat seal the material wrapped in the heat shrink film, the heat sealing component is arranged at one end of the heating chamber, and the heat sealing component is used to heat the heat-sealed material to shrink the heat shrink film.

[0006] The heat sealing assembly includes a first group of melting knives arranged in the material conveying direction and a second group of melting knives arranged perpendicular to the first group of melting knives. The second group of melting knives is arranged on the heat sealing assembly at a position behind the material conveying direction. Two melting knives form a group. The two melting knives in the same group move toward each other to achieve heat sealing. The first group of melting knives first heat seals the heat shrinkable film, then drives the tightening assembly to tighten the heat shrinkable film in the width direction, and finally drives the second group of melting knives to heat seal. Cleaning components are also arranged on the outsides of the two groups of melting knives.

[0007] Furthermore, the heat sealing assembly includes two front beams, which are respectively arranged perpendicular to the conveying direction of the materials on the conveying frame, and the two front beams are arranged on the upper and lower sides of the conveying frame. The first end of the side beam is fixedly installed at both ends of the front beam, and the two side beams located on the same side of the material conveying direction are connected by a fixed vertical plate, and the fixed vertical plate is used to fix the heat sealing assembly. Guide plates are arranged inside the side beams and the front beams, and a second sliding rod is slidably installed on the guide plate. A lifting plate is fixedly installed on one end of the second sliding rod located between the two side beams, and the lifting plate is located at one end of the outer sides of the two side beams. A second spring coaxial with the second slide bar is arranged between the guide plate, a cylinder body of a driving electric cylinder is fixedly installed on the guide plate, a movable end of the driving electric cylinder passes through the guide plate and is fixedly connected to the lifting plate, first slide bars are slidably installed on both ends of the lifting plate, a rotating seat is fixedly installed on one end of the first slide bar located between the two lifting plates, a melting knife is rotatably installed between the two first springs installed on the same lifting plate, a motor for driving the melting knife to rotate is arranged inside the rotating seat, and when the two lifting plates located on the side of the material conveying direction descend, the tightening assembly and another group of lifting plates are driven to descend in sequence.

[0008] Furthermore, the tightening assembly includes a mounting plate fixedly mounted on the front beam, a first gear is rotatably mounted on the fixed vertical plate, the first gear and the sliding rack form a gear-rack transmission, the sliding rack is slidably mounted on the mounting plate, the first end of the sliding rack is fixedly connected to the first end of the pull rope 1, the pull rope 1 passes through the first threading plate and the guide plate fixedly mounted on the side beam and is fixedly connected to the lifting plate, the second end of the sliding rack is fixedly connected to the first end of the third spring, the second end of the third spring is fixedly mounted on the side beam, the end of the sliding rack close to the pull rope 1 is not provided with a toothed structure, the first tightening rod, the second tightening rod and the third tightening rod are slidably mounted in the length direction of the front beam, and the rotation of the rotating frame is used to drive the sliding of the first tightening rod, the second tightening rod and the third tightening rod.

[0009] Furthermore, both ends of the third tightening rod are slidably mounted on the two front beams, the first tightening rod is slidably mounted on the upper front beam, the guide plate is slidably mounted on the lower front beam, a telescopic rod is provided at the lower end of the first tightening rod, the melting knife is coaxial with the guide plate, the first end of the third tightening rod is connected to the first tightening rod by a pull rope three, the third tightening rod is also connected to the second tightening rod by a pull rope three, the middle part of the pull rope three is connected to the first end of the pull rope two, the second end of the pull rope two is fixedly mounted on the rotating frame away from the end of the pull rope three, and the An adjusting screw is rotatably installed between the two ends of the rotating frame, a rotating wheel is provided at the end of the adjusting screw, a slider is threadedly connected to the adjusting screw, the slider is slidably installed on the rotating frame, a limiting hole is provided on the slider, a second threading plate is provided on the mounting plate, the pull rope 2 passes through the second threading plate and the limiting hole, sleeves are simultaneously provided on the two ends of the third tightening rod and the first tightening rod and the second tightening rod, the sleeves extend out of the front beam, two first baffles are provided in the middle position of the front beam, and a fourth spring is provided between the sleeves and the first baffle.

[0010] Furthermore, a first end of a fixed shaft is fixedly mounted on the lifting plate, a second end of the fixed shaft is slidably mounted inside a limit frame, the limit frame is fixedly mounted between two side beams, a second gear is coaxially mounted on the fixed shaft, a fixed rack and a lifting rack are provided on both sides of the second gear, the second gear forms a gear-rack transmission with the fixed rack and the lifting rack respectively, the fixed rack is fixedly mounted on the mounting plate, the lifting rack is fixedly mounted on the lifting plate located on the front beam, and a portion of the fixed rack close to the mounting plate is not provided with a toothed structure.

[0011] Furthermore, the cleaning assembly includes a movable plate arranged on the outside of the two groups of melting knives, the movable plate is slidably installed on the outside of the two groups of melting knives, two groups of cleaning rods are slidably installed on the movable plate, two cleaning rods located at the same horizontal height are a group, and the two cleaning rods in the same group move toward or away from each other at the same time to achieve cleaning of the melting knives.

[0012] Furthermore, two slides are slidably installed on the movable plate, each slide is hinged to the two cleaning rods through a connecting rod, a third baffle is arranged on the slide, a second baffle is arranged on the upper and lower sides of the movable plate, a fifth spring is arranged between the second baffle and the third baffle, a cam is rotatably installed on the middle part of the movable plate, the side surface of the cam is in contact with the two slides, the cam is coaxially fixedly installed on the output shaft of the cam motor, the cam motor is fixedly installed on the motor seat, and the motor seat is fixedly installed on the movable plate.

[0013] Furthermore, mounting frames are respectively provided at both ends of the side beam and the front beam, a cleaning screw is rotatably installed on the outer side of one of the side beams and the front beam, and a polished rod is provided on the outer side of the other side beam and the front beam, the first end of the movable plate forms a threaded fit with the cleaning screw, the second end of the movable plate is slidably installed on the polished rod, the cleaning screw is fixedly connected to the output shaft of the screw motor, and the screw motor is fixedly installed on the mounting frame.

[0014] Compared with the prior art, the present invention has the following advantages: (1) The tightening assembly provided in the present invention can automatically tighten the heat shrink film in the width direction of the material under the drive of the side melting knife, so that the length of the heat seal opening in the width direction of the material is less than the length of the material, thereby ensuring that the heat shrink film fits the material well during heat sealing, avoiding the appearance of spikes, and ensuring the quality of heat sealing; (2) The present invention drives the tightening assembly and the second group of melting knives to move in sequence through the descending action of the first group of melting knives located on the side of the material, which has a clever structure, compact functions, continuous actions, and high energy utilization rate; (3) The cleaning assembly provided in the present invention is driven by a single power source to realize the reciprocating motion of the two groups of cleaning rods, and cooperates with the overall sliding of the cleaning assembly to achieve efficient cleaning of the melting knife, thereby preventing the defect of poor sealing caused by the adhesion of molten plastic to the melting knife. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 Schematic diagram of the heat sealing assembly structure of the present invention Figure 1 .

[0017] Figure 3 The structure of the heat sealing component of the present invention after removing the cleaning component is schematically shown. Figure 1 .

[0018] Figure 4 The structure of the heat sealing component of the present invention after removing the cleaning component is schematically shown. Figure 2 .

[0019] Figure 5 The structure of the heat sealing component of the present invention after removing the cleaning component is schematically shown. Figure 3 .

[0020] Figure 6 for Figure 5 A local enlarged schematic diagram of point A in the middle.

[0021] Figure 7 The structure of the heat sealing component of the present invention after removing the cleaning component is schematically shown. Figure 4 .

[0022] Figure 8 This is a partial structural schematic diagram of the heat sealing assembly of the present invention after removing the cleaning assembly.

[0023] Fig. 9 Schematic diagram of the heat sealing assembly structure of the present invention Figure 2 .

[0024] Fig.10 for Fig. 9 A local enlarged schematic diagram of point B in the middle.

[0025] Figure numbers: 1-transport rack; 2-heating chamber; 3-heat sealing assembly; 301-side beam; 302-fixed vertical plate; 303-front beam; 304-lifting plate; 305-first slide bar; 306-first spring; 307-rotating seat; 308-melting knife; 309-guide plate; 310-driving electric cylinder; 311-second spring; 312-second slide bar; 313-first threading plate; 314-pull rope one; 315-sliding rack; 316-third spring; 317-first gear; 318-rotating rack; 319-adjusting screw; 320-rotating wheel; 321-mounting plate; 322-sliding block; 323-second threading plate; 324-pull rope two; 325-limit Position hole; 326-pull rope three; 327-first tightening rod; 328-telescopic rod; 329-second tightening rod; 330-third tightening rod; 331-sleeve; 332-fourth spring; 333-first baffle; 334-fixed shaft; 335-fixed rack; 336-second gear; 337-lifting rack; 338-mounting frame; 339-screw motor; 340-cleaning screw; 341-moving plate; 342-second baffle; 343-fifth spring; 344-third baffle; 345-slide seat; 346-cleaning rod; 347-connecting rod; 348-cam; 349-motor seat; 350-cam motor; 351-limiting frame; 352-light rod. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0027] Example: Reference Figure 1-Figure 10 A fully automatic heat shrink film packaging machine includes a conveyor frame 1, a heating chamber 2 and a heat sealing component 3. The conveyor frame 1 is arranged in the middle position of the heating chamber 2. The conveyor frame 1 is used to convey the material to be packaged. The heating chamber 2 is used to heat seal the material wrapped in the heat shrink film. The heat sealing component 3 is arranged at one end of the heating chamber 2. The heat sealing component 3 is used to heat the heat-sealed material to shrink the heat shrink film.

[0028] The heat sealing assembly 3 includes a first group of melting knives 308 arranged in the material conveying direction and a second group of melting knives 308 arranged perpendicular to the first group of melting knives 308. The second group of melting knives 308 are arranged on the heat sealing assembly 3 at a position behind the material conveying direction. The two melting knives 308 form a group. The two melting knives 308 in the same group move toward each other to achieve heat sealing. The first group of melting knives 308 first heat seals the heat shrink film, then drives the tightening assembly to tighten the heat shrink film in the width direction, and finally drives the second group of melting knives 308 to heat seal. Cleaning assemblies are also arranged on the outsides of the two groups of melting knives 308.

[0029] like Figure 1 , Figure 2 , Figure 3 As shown, the heat sealing assembly 3 includes two front beams 303, and the two front beams 303 are respectively arranged perpendicular to the conveying direction of the material on the conveying frame 1. The two front beams 303 are arranged on the upper and lower sides of the conveying frame 1. The first ends of the side beams 301 are fixedly installed at both ends of the front beams 303. The two side beams 301 located on the same side of the material conveying direction are connected by a fixed vertical plate 302. The fixed vertical plate 302 is used to fix the heat sealing assembly 3. Guide plates 309 are arranged inside the side beams 301 and the front beams 303. A second sliding rod 312 is slidably installed on the guide plate 309. A lifting plate 304 is fixedly installed on one end of the second sliding rod 312 located between the two side beams 301. The lifting plate 304 is located at one end of the outer side of the two side beams 301 and is connected to the guide plate 3 09, a second spring 311 coaxial with the second slide bar 312 is arranged between the guide plate 309, a cylinder body of a driving electric cylinder 310 is fixedly mounted on the guide plate 309, a movable end of the driving electric cylinder 310 passes through the guide plate 309 and is fixedly connected to the lifting plate 304, first slide bars 305 are slidably mounted on both ends of the lifting plate 304, a rotating seat 307 is fixedly mounted on one end of the first slide bar 305 located between the two lifting plates 304, a melting knife 308 is rotatably mounted between the two first springs 306 installed on the same lifting plate 304, a motor for driving the melting knife 308 to rotate is arranged inside the rotating seat 307, and the two lifting plates 304 located on the side of the material conveying direction descend while driving the tightening assembly and the other group of lifting plates 304 to descend in turn.

[0030] like Figure 5 , Figure 6 , Figure 7 , Figure 8As shown, the tightening assembly includes a first threading plate 313, a pull rope 1 314, a sliding rack 315, a third spring 316, a first gear 317, a rotating frame 318, an adjusting screw 319, a rotating wheel 320, a mounting plate 321, a slider 322, a second threading plate 323, a pull rope 2 324, a limiting hole 325, a pull rope 326, a first tightening rod 327, a telescopic rod 328, a second tightening rod 329, a third tightening rod 330, a sleeve 331, a fourth spring 332 and a first baffle 333. The mounting plate 321 is fixedly mounted on the front beam 303, and a first gear 317 is rotatably mounted on the fixed vertical plate 302. The first gear 317 and the sliding rack 315 form a gear rack transmission. The sliding rack 315 is slidably mounted on the mounting plate 321. On the mounting plate 321, the first end of the sliding rack 315 is fixedly connected to the first end of the pull rope 314, and the pull rope 314 is fixedly connected to the lifting plate 304 after passing through the first threading plate 313 and the guide plate 309 fixedly installed on the side beam 301. The second end of the sliding rack 315 is fixedly connected to the first end of the third spring 316, and the second end of the third spring 316 is fixedly installed on the side beam 301. The end of the sliding rack 315 close to the pull rope 314 is not provided with a toothed structure, and the first tightening rod 327, the second tightening rod 329 and the third tightening rod 330 are slidably installed in the length direction of the front beam 303, and the rotating frame 318 rotates to drive the first tightening rod 327, the second tightening rod 329 and the third tightening rod 330 to slide.

[0031] The two ends of the third tightening rod 330 are slidably mounted on the two front beams 303, the first tightening rod 327 is slidably mounted on the upper front beam 303, the guide plate 309 is slidably mounted on the lower front beam 303, the lower end of the first tightening rod 327 is provided with a telescopic rod 328, the melting knife 308 is coaxial with the guide plate 309, the first end of the third tightening rod 330 is connected to the first tightening rod 327 by a pull rope three 326, the third tightening rod 330 is also connected to the second tightening rod 329 by a pull rope three 326, the middle part of the pull rope three 326 is connected to the first end of the pull rope two 324, the second end of the pull rope two 324 is fixedly mounted on the rotating frame 318 away from the end of the pull rope three 326, the rotating frame 318 An adjusting screw 319 is rotatably installed between the two ends, and a rotating wheel 320 is arranged at the end of the adjusting screw 319. A slider 322 is threadedly connected to the adjusting screw 319, and the slider 322 is slidably installed on the rotating frame 318. A limiting hole 325 is arranged on the slider 322, and a second threading plate 323 is arranged on the mounting plate 321. The pull rope 324 passes through the second threading plate 323 and the limiting hole 325. Both ends of the third tightening rod 330 and the first tightening rod 327 and the second tightening rod 329 are simultaneously sleeved with a sleeve 331, and the sleeve 331 extends out of the front beam 303. Two first baffles 333 are arranged in the middle position of the front beam 303, and a fourth spring 332 is arranged between the sleeve 331 and the first baffle 333.

[0032] The first end of the fixed shaft 334 is fixedly mounted on the lifting plate 304, and the second end of the fixed shaft 334 is slidably mounted inside the limit frame 351. The limit frame 351 is fixedly mounted between the two side beams 301. A second gear 336 is coaxially mounted on the fixed shaft 334. A fixed rack 335 and a lifting rack 337 are provided on both sides of the second gear 336. The second gear 336 forms a gear rack transmission with the fixed rack 335 and the lifting rack 337 respectively. The fixed rack 335 is fixedly mounted on the mounting plate 321, and the lifting rack 337 is fixedly mounted on the lifting plate 304 located on the front beam 303. The portion of the fixed rack 335 close to the mounting plate 321 is not provided with a toothed structure.

[0033] like Fig. 9 , Fig.10 As shown, the cleaning assembly includes a mounting frame 338, a screw motor 339, a cleaning screw 340, a movable plate 341, a second baffle 342, a fifth spring 343, a third baffle 344, a slide seat 345, a cleaning rod 346, a connecting rod 347, a cam 348, a motor seat 349, a cam motor 350 and a light rod 352. The movable plate 341 is arranged on the outside of the two groups of melting knives 308. The movable plate 341 is slidably installed on the outside of the two groups of melting knives 308. Two groups of cleaning rods 346 are slidably installed on the movable plate 341. Two cleaning rods 346 located at the same horizontal height are a group. The two cleaning rods 346 in the same group move toward or away from each other at the same time to achieve cleaning of the melting knives 308.

[0034] Two slide seats 345 are slidably installed on the movable plate 341, and each slide seat 345 is hinged to two cleaning rods 346 through a connecting rod 347. A third baffle 344 is arranged on the slide seat 345, and a second baffle 342 is arranged on the upper and lower sides of the movable plate 341. A fifth spring 343 is arranged between the second baffle 342 and the third baffle 344. A cam 348 is rotatably installed on the middle part of the movable plate 341, and the side surface of the cam 348 contacts the two slide seats 345. The cam 348 is coaxially fixedly installed on the output shaft of the cam motor 350, and the cam motor 350 is fixedly installed on the motor seat 349, and the motor seat 349 is fixedly installed on the movable plate 341.

[0035] Mounting frames 338 are respectively provided at both ends of the side beam 301 and the front beam 303, a cleaning screw 340 is rotatably installed on the outer side of one of the side beams 301 and the front beam 303, and a light rod 352 is provided on the outer side of the other side beam 301 and the front beam 303, the first end of the movable plate 341 forms a threaded fit with the cleaning screw 340, and the second end of the movable plate 341 is slidably installed on the light rod 352, the cleaning screw 340 is fixedly connected to the output shaft of the screw motor 339, and the screw motor 339 is fixedly installed on the mounting frame 338.

[0036] The working principle of the fully automatic heat shrink film packaging machine disclosed in the present invention is as follows: the material fed into the heat sealing component 3 through the conveying frame 1 is wrapped by the heat shrink film at the same time. The heat shrink film is in the shape of a long strip. The long strip heat shrink film is folded in half in the width direction to wrap the material. The wrapping form refers to the prior art and will not be repeated here. When heat sealing is performed, the two driving electric cylinders 310 are started, and the two driving electric cylinders 310 drive the lifting plate 304 to descend. At the same time, the second sliding rod 312 slides on the guide plate 309. At this time, the second spring 311 is compressed, and the two melting knives 308 located on the side beam 301 are in contact with each other. At this time, the second spring 311 is compressed, and the two melting knives 308 located on the side beam 301 are in contact with each other. To seal the side of the heat shrink film, the output shaft of the driving electric cylinder 310 continues to extend, and the lifting plate 304 continues to descend. The first spring 306 is compressed. At the same time, as the lifting plate 304 pulls the pull rope 1 314 to slide through the pull rope 1 314, the toothed structure on the sliding rack 315 begins to form a gear rack match with the first gear 317. The sliding rack 315 drives the first gear 317 to rotate, and the first gear 317 drives the rotating frame 318 to rotate synchronously. When the rotating frame 318 rotates, the pull rope 2 324 is wound around the slider 322 and the rotating frame 318. One end of the pull rope 2 324 is fixed to the rotating frame 318. At this time, the pull rope 2 324 will pull the pull rope 326, and the pull rope 326 will pull the third tightening rod 330, the first tightening rod 327 and the second tightening rod 329 to move towards each other. At the same time, the movable end of the telescopic rod 328 extends into the second tightening rod 329 at the side that has been heat-sealed. At this time, the heat shrink film is tightened in the width direction, so that the sealing length in the width direction is less than the width of the material, thereby ensuring the flatness of the shrinkage. To adapt to different material sizes, the rotating wheel 320 can be rotated to drive the adjusting screw 319 to rotate, thereby driving the slider 322 to slide on the rotating frame 318, and the adjusting The distance between the slider 322 and the end of the rotating frame 318 is adjusted to adjust the relative sliding distance between the first tightening rod 327 and the second tightening rod 329 and the third tightening rod 330. While the sliding rack 315 forms a gear rack meshing with the first gear 317, the second gear 336 also forms a gear rack cooperation with the toothed structure on the fixed rack 335. Therefore, with the relative movement of the two fixed shafts 334, the second gear 336 drives the lifting rack 337 to move relative to each other, and the lifting rack 337 drives the two melting knives 308 located on the front beam 303 to move relative to each other, thereby completing the sealing operation in the width direction.

[0037] When the melting knife 308 needs to be cleaned, the motor located inside the rotating seat 307 is started to make the melting knife 308 Figure 1In the state shown in the figure, the screw motor 339 and the cam motor 350 are started, the screw motor 339 drives the cleaning screw 340 to rotate, and the rotation of the cleaning screw 340 drives the movable plate 341 to slide outside the side beam 301 and the front beam 303, and at the same time, the cam motor 350 drives the cam 348 to rotate, and the cam 348 pushes the two slides 345 to slide on the pull rope 314, and the sliding seats 345 drive the cleaning rods 346 to slide through the connecting rod 347. Due to the existence of the fifth spring 343, the two pairs of cleaning rods 346 slide back and forth to realize the cleaning of the melting knife 308.

Claims

1. A fully automatic heat shrink film packaging machine, characterized in that: The invention comprises a conveying frame (1), a heating chamber (2) and a heat sealing assembly (3), wherein the conveying frame (1) is arranged in the middle of the heating chamber (2), the conveying frame (1) is used to convey materials to be packaged, the heating chamber (2) is used to heat-seal the materials wrapped in a heat shrink film, the heat sealing assembly (3) is arranged at one end of the heating chamber (2), and the heat sealing assembly (3) is used to heat the heat-sealed materials so that the heat shrink film shrinks; the heat sealing assembly (3) comprises a first group of melting knives (308) arranged in the material conveying direction and a heat sealing assembly connected to the first group of melting knives (308). The knife (308) is vertically arranged in a second group of melting knives (308), the second group of melting knives (308) is arranged on the heat sealing component (3) at a position behind the material conveying direction, two melting knives (308) form a group, and the two melting knives (308) in the same group move towards each other to achieve heat sealing, the first group of melting knives (308) first heat seals the heat shrink film, then drives the tightening component to tighten the heat shrink film in the width direction, and finally drives the second group of melting knives (308) to heat seal, and cleaning components are also arranged on the outer sides of the two groups of melting knives (308); The heat sealing assembly (3) comprises a rotating frame (318) and two front beams (303), the two front beams (303) being respectively arranged perpendicular to the conveying direction of the material on the conveying frame (1), the two front beams (303) being arranged on the upper and lower sides of the conveying frame (1), the first ends of the side beams (301) being fixedly mounted at both ends of the front beams (303), the two side beams (301) being located on the same side of the material conveying direction being connected via a fixed vertical plate (302), the fixed vertical plate (302) being used to fix the heat sealing assembly (3), the side beams (301) and the front beams (303) being internally provided with guide plates (309), the guide plates (309) being slidably mounted with a second sliding rod (312), the second sliding rod (312) being fixedly mounted with a lifting plate (304) on one end thereof located between the two side beams (301), the lifting plate (304) being located on one end of the outer sides of the two side beams (301) A second spring (311) coaxial with the second slide bar (312) is arranged between the end portion and the guide plate (309); a cylinder body of a driving electric cylinder (310) is fixedly mounted on the guide plate (309); a movable end of the driving electric cylinder (310) passes through the guide plate (309) and is fixedly connected to the lifting plate (304); first slide bars (305) are slidably mounted on both ends of the lifting plate (304); a rotating seat (307) is fixedly mounted on one end of the first slide bar (305) located between the two lifting plates (304); a melting knife (308) is rotatably mounted between two first springs (306) mounted on the same lifting plate (304); a motor for driving the melting knife (308) to rotate is arranged inside the rotating seat (307); and when the two lifting plates (304) located on the side of the material conveying direction descend, the tightening assembly and another group of lifting plates (304) are driven to descend in sequence; The tightening assembly comprises a mounting plate (321) fixedly mounted on the front beam (303); a first gear (317) is rotatably mounted on the fixed vertical plate (302); the first gear (317) and the sliding rack (315) form a gear rack transmission; the sliding rack (315) is slidably mounted on the mounting plate (321); a first end of the sliding rack (315) is fixedly connected to a first end of a pull rope (314); the pull rope (314) passes through a first threading plate (313) fixedly mounted on the side beam (301) and a guide plate (309) and is then fixed to the lifting plate (304). The second end of the sliding rack (315) is fixedly connected to the first end of the third spring (316), the second end of the third spring (316) is fixedly mounted on the side beam (301), the end of the sliding rack (315) close to the pull rope (314) is not provided with a toothed structure, the first tightening rod (327), the second tightening rod (329) and the third tightening rod (330) are slidably mounted on the length direction of the front beam (303), and the rotating frame (318) is used to rotate to drive the first tightening rod (327), the second tightening rod (329) and the third tightening rod (330) to slide.

2. The fully automatic heat shrink film packaging machine according to claim 1, characterized in that: The third tightening rod (330) is slidably mounted on the two front beams (303) at both ends, the first tightening rod (327) is slidably mounted on the upper front beam (303), the guide plate (309) is slidably mounted on the lower front beam (303), a telescopic rod (328) is provided at the lower end of the first tightening rod (327), the melting knife (308) is coaxial with the guide plate (309), the first end of the third tightening rod (330) is connected to the first tightening rod (327) by a pull rope three (326), the third tightening rod (330) is also connected to the second tightening rod (329) by a pull rope three (326), the middle part of the pull rope three (326) is connected to the first end of the pull rope two (324), the second end of the pull rope two (324) is fixedly mounted on the rotating frame (318) away from the end of the pull rope three (326), and the rotating frame (318) is rotatably mounted between the two ends. An adjusting screw (319) is provided, a rotating wheel (320) is provided at the end of the adjusting screw (319), a slider (322) is threadedly connected to the adjusting screw (319), the slider (322) is slidably mounted on the rotating frame (318), a limiting hole (325) is provided on the slider (322), a second threading plate (323) is provided on the mounting plate (321), the second pull rope (324) passes through the second threading plate (323) and the limiting hole (325), sleeves (331) are provided on both ends of the third tightening rod (330) and the first tightening rod (327) and the second tightening rod (329), the sleeves (331) extend out of the front beam (303), two first baffles (333) are provided in the middle of the front beam (303), and a fourth spring (332) is provided between the sleeve (331) and the first baffle (333).

3. The fully automatic heat shrink film packaging machine according to claim 1, characterized in that: The first end of a fixed shaft (334) is fixedly mounted on the lifting plate (304), the second end of the fixed shaft (334) is slidably mounted inside a limit frame (351), the limit frame (351) is fixedly mounted between two side beams (301), a second gear (336) is coaxially rotatably mounted on the fixed shaft (334), a fixed rack (335) and a lifting rack (337) are arranged on both sides of the second gear (336), the second gear (336) and the fixed rack (335) and the lifting rack (337) respectively form a gear-rack transmission, the fixed rack (335) is fixedly mounted on the mounting plate (321), the lifting rack (337) is fixedly mounted on the lifting plate (304) located on the front beam (303), and a portion of the fixed rack (335) close to the mounting plate (321) is not provided with a toothed structure.

4. The fully automatic heat shrink film packaging machine according to claim 1, characterized in that: The cleaning assembly comprises a movable plate (341) arranged on the outside of two groups of melting knives (308); the movable plate (341) is slidably mounted on the outside of the two groups of melting knives (308); two groups of cleaning rods (346) are slidably mounted on the movable plate (341); two cleaning rods (346) located at the same horizontal height form a group; the two cleaning rods (346) in the same group move towards or away from each other at the same time to achieve cleaning of the melting knives (308).

5. The fully automatic heat shrink film packaging machine according to claim 4, characterized in that: Two slide seats (345) are slidably mounted on the movable plate (341), each slide seat (345) is hinged to two cleaning rods (346) via a connecting rod (347), a third baffle (344) is arranged on the slide seat (345), a second baffle (342) is arranged on the upper and lower sides of the movable plate (341), a fifth spring (343) is arranged between the second baffle (342) and the third baffle (344), a cam (348) is rotatably mounted on the middle part of the movable plate (341), the side surface of the cam (348) contacts the two slide seats (345), the cam (348) is coaxially fixedly mounted on the output shaft of the cam motor (350), the cam motor (350) is fixedly mounted on the motor seat (349), and the motor seat (349) is fixedly mounted on the movable plate (341).

6. The fully automatic heat shrink film packaging machine according to claim 4, characterized in that: Mounting frames (338) are respectively provided at both ends of the side beam (301) and the front beam (303); a cleaning screw (340) is rotatably mounted on the outer side of one of the side beams (301) and the front beam (303); a polished rod (352) is provided on the outer side of the other side beam (301) and the front beam (303); a first end of the movable plate (341) is threadedly engaged with the cleaning screw (340); a second end of the movable plate (341) is slidably mounted on the polished rod (352); the cleaning screw (340) is fixedly connected to an output shaft of a screw motor (339); and the screw motor (339) is fixedly mounted on the mounting frame (338).

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