An automatic packing machine

Abstract

The application relates to the technical field of packaging machinery, in particular to an automatic packing machine which comprises an adjusting mechanism arranged on the outer side of a conveying table, a heat sealing mechanism arranged on the adjusting mechanism, and a supporting mechanism arranged on the rear side of the conveying table and located on the lower side of the heat sealing mechanism; the application can realize that the plastic film can be stably attached to the surface of a carton during preliminary wrapping, so that the film relaxation problem caused by the reserved safety distance in the traditional way can be effectively avoided; meanwhile, in the process of positioning and attaching the film, the high-temperature heat source can be kept away from the carton and the plastic film attached to the surface of the carton through physical isolation, so that the high-temperature heat source can only accurately act on the film lap area at the sealing moment; the heat sealing working surface and the cutter blade part can also be quickly cleaned after the heat sealing and cutting actions are completed, and the residual molten plastic on the surface can be timely removed, so that the accumulation of residual substances can be effectively prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packaging machinery, in particular to an automatic packing machine. BACKGROUND

[0002] The paper box plastic sealing and packing equipment, also known as a heat shrink film packaging machine, is an automatic packaging machine that first wraps a paper box product with a plastic film and then shrinks and tightly adheres the plastic film to the surface of the paper box through heating.

[0003] In the prior art, when wrapping a paper box product with a plastic film, the plastic film is first fed by a winding conveying device and covered in front of the paper box, and then an external pushing force is used to drive the paper box to move forward, so that the paper box pushes and opens the plastic film to form a loose "packaging bag", thereby preliminarily wrapping the paper box itself. When the paper box pulls the plastic film through the sealing and cutting device, the sensing system will detect the position of the paper box, and the heat sealing device will then move downward until the overlapping part of the plastic film is pressed and fused by high temperature, thereby forming a firm sealing seam. The cutting knife moves downward synchronously to complete the heat sealing of the overlapping part of the plastic film, and at the same time, the rear plastic film connected to the plastic film wrapped on the surface of the paper box is cut off synchronously, thereby completing the wrapping of the current paper box and preparing for the wrapping of the next paper box.

[0004] However, the conventional wrapping method of a paper box product with a plastic film has the following problems: 1. In the prior art, in order to ensure that the high-temperature working surface of the heat sealing device does not damage the surface of the paper box and the plastic film already wrapped on the surface of the paper box when pressing the overlapping part of the film, the film is usually covered on the outside of the paper box in a relatively loose state during the initial wrapping stage. However, this operation method of reserving a safety distance, although effectively avoiding direct burning of the material by the heat source, also causes the film to be in a relaxed state before entering the subsequent heat shrinkage process, thereby causing the plastic film to be easily displaced, twisted or locally folded during the conveying process, which affects the uniformity of the film shrinkage during the subsequent heat plastic process and adversely affects the overall flatness of the plastic sealing appearance and the packaging quality; 2. In the prior art, since the heat sealing device and the cutting knife need to act synchronously on the overlapping area of the film, the molten plastic is easily left on the cutting knife blade and the heat sealing working surface during the high-temperature fusion process. Such residues continuously accumulate during continuous operation, which not only hinders the smooth cutting of the cutting knife and the effective pressing of the heat sealing structure, but also may cause uneven sealing lines and incomplete film cutting, thereby adversely affecting the continuity of the subsequent wrapping process and the quality of the finished product packaging. SUMMARY

[0005] In order to achieve the above object, the present application provides the following technical scheme: An automatic packing machine comprises a conveying table, an adjusting mechanism arranged outside the conveying table, a heat sealing mechanism arranged on the adjusting mechanism, and a supporting mechanism arranged at the rear side of the conveying table below the heat sealing mechanism.

[0006] The adjusting mechanism comprises a U-shaped frame arranged outside the conveying table, a guide and fitting part arranged on the U-shaped frame and used for guiding and fitting the plastic film on the upper side of the carton, and a lifting cutting part arranged on the U-shaped frame and used for cutting the plastic film.

[0007] The heat sealing mechanism comprises a positioning heat sealing part arranged on the lifting cutting part and used for heat sealing the plastic film at the rear side of the carton, a driven heat sealing part arranged on the positioning heat sealing part and used for heat sealing the plastic film at the rear end of the carton only at the moment of sealing, an active scraping part arranged on the positioning heat sealing part and used for scraping the residual plastic on the surface of the corresponding heat source, and a driven scraping part arranged on the driven heat sealing part and used for scraping the residual plastic on the surface of the corresponding heat source.

[0008] The supporting mechanism comprises an abutting supporting part arranged at the rear side of the conveying table and used for supporting and heat sealing the plastic film at the abutting part of the heat source.

[0009] Preferably, the guide and fitting part comprises a cylinder one fixedly arranged on the upper side of the U-shaped frame, an U-shaped lifting plate movably arranged at the extension end of the cylinder one, a guide rod one symmetrically arranged on the upper side of the U-shaped lifting plate and slidably connected with the horizontal section of the U-shaped frame, and a damping roller symmetrically arranged on the lower side of the U-shaped lifting plate.

[0010] Preferably, the lifting cutting part comprises a cylinder two fixedly arranged on the upper side of the U-shaped frame, a fixed plate movably arranged at the extension end of the cylinder two, a guide rod two symmetrically arranged on the upper side of the fixed plate and slidably connected with the horizontal section of the U-shaped frame, a spring rod one symmetrically arranged on the lower side of the fixed plate, a lifting table movably arranged on the spring rod one, a cutter fixedly arranged on the lower side of the spring rod one, and a wedge-shaped block fixedly arranged on the cutter and having an inclined lower side.

[0011] Preferably, the heat insulation fitting part comprises a heat insulation plate fixedly arranged at the front end of the lifting table, a rotating plate rotatably arranged on the lower end of the heat insulation plate through a rotating shaft one, and a fitting pressure roller rotatably arranged on the upper end of the rotating plate.

[0012] Preferably, the positioning heat sealing part comprises two left-right symmetrical connecting frames fixedly arranged at the lower side of the rear end of the lifting platform, a heat sealing roller one is fixedly arranged between the lower ends of the two connecting frames, a connecting table is fixedly arranged on the opposite side of each of the two connecting frames, and a gear rack is fixedly arranged at the front end of the connecting table.

[0013] Preferably, the driven heat sealing part comprises two spring rods two elastically and obliquely arranged on the opposite sides of each of the two connecting frames through the support and located above the connecting table, an L-shaped fixing frame is fixedly arranged at the lower end of each of the two spring rods two and in pressure cooperation with the inclined surface of the corresponding wedge-shaped block, and a heat sealing roller two is fixedly arranged between the lower ends of the two L-shaped fixing frames.

[0014] Preferably, the driven heat sealing part comprises two spring rods two elastically and obliquely arranged on the opposite sides of each of the two connecting frames through the support and located above the connecting table, an L-shaped fixing frame is fixedly arranged at the lower end of each of the two spring rods two and in pressure cooperation with the inclined surface of the corresponding wedge-shaped block, and a heat sealing roller two is fixedly arranged between the lower ends of the two L-shaped fixing frames.

[0015] Preferably, the driven heat sealing part comprises two spring rods two elastically and obliquely arranged on the opposite sides of each of the two connecting frames through the support and located above the connecting table, an L-shaped fixing frame is fixedly arranged at the lower end of each of the two spring rods two and in pressure cooperation with the inclined surface of the corresponding wedge-shaped block, and a heat sealing roller two is fixedly arranged between the lower ends of the two L-shaped fixing frames.

[0016] Preferably, the driven heat sealing part comprises two spring rods two elastically and obliquely arranged on the opposite sides of each of the two connecting frames through the support and located above the connecting table, an L-shaped fixing frame is fixedly arranged at the lower end of each of the two spring rods two and in pressure cooperation with the inclined surface of the corresponding wedge-shaped block, and a heat sealing roller two is fixedly arranged between the lower ends of the two L-shaped fixing frames.

[0017] Preferably, the driven heat sealing part comprises two spring rods two elastically and obliquely arranged on the opposite sides of each of the two connecting frames through the support and located above the connecting table, an L-shaped fixing frame is fixedly arranged at the lower end of each of the two spring rods two and in pressure cooperation with the inclined surface of the corresponding wedge-shaped block, and a heat sealing roller two is fixedly arranged between the lower ends of the two L-shaped fixing frames.

[0018] Compared with the prior art, the present application has the following advantages: 1. The present application can realize stable adhesion of the plastic film to the surface of the carton during preliminary wrapping through the cooperation of the adjusting mechanism and the heat sealing mechanism, thereby effectively avoiding the film relaxation problem caused by the reserved safety distance in the traditional way. At the same time, in the process of positioning and adhesion of the film, physical isolation can be used to keep the high-temperature heat source away from the carton and the plastic film wrapped on the surface thereof, so that the high-temperature heat source only acts accurately on the film lap area for a moment, thereby eliminating the risk of burning of the heat source to the carton and the covered film, and ensuring the stability and adhesion during wrapping through positioning and adhesion of the film, thereby significantly improving the flatness of the plastic wrapping appearance and the overall packaging quality while ensuring the safety of the operation.

[0019] 2. This invention, through the coordination of the adjustment mechanism, heat sealing mechanism, and support mechanism, enables rapid cleaning of the heat-sealing working surface and the cutting blade after the heat sealing and cutting actions are completed. This timely removal of residual molten plastic on the surface effectively prevents the accumulation of residues, ensuring that the heat-sealing structure always maintains a clean working surface and stable heat conduction performance. At the same time, it maintains the sharpness and smoothness of the cutting blade, thereby ensuring the flatness of the sealing line and the thoroughness of the film cutting, significantly improving the stability of continuous operation of the equipment and the consistency of finished product packaging quality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a side cross-sectional view of part of the structure of the present invention.

[0022] Figure 3 for Figure 2 Enlarged diagram of point A in the middle.

[0023] Figure 4 This is a schematic diagram of the adjustment mechanism.

[0024] Figure 5 This is a frontal cross-sectional view of the lifting and cutting section.

[0025] Figure 6 This is a schematic diagram of the structure of the heat insulation bonding part.

[0026] Figure 7 for Figure 6 Enlarged diagram of point B in the middle.

[0027] Figure 8 This is a partial structural diagram of the heat sealing mechanism.

[0028] Figure 9 This is a schematic diagram of the driven heat seal section.

[0029] Figure 10 This is a top-view cross-sectional schematic diagram of the driven heat seal section.

[0030] Figure 11 This is a schematic diagram of part of the supporting mechanism.

[0031] Figure 12 This is a partial cross-sectional view of the cutting and cleaning section.

[0032] In the diagram: 1. Conveyor table; 2. Adjustment mechanism; 21. U-shaped frame; 22. Guide bonding part; 221. Cylinder 1; 222. U-shaped lifting plate; 223. Damping roller; 23. Lifting and cutting part; 231. Cylinder 2; 232. Fixing plate; 233. Spring rod 1; 234. Lifting platform; 235. Cutter; 236. Wedge block; 24. Heat insulation bonding part; 241. Heat insulation plate; 242. Rotating plate; 243. Bonding pressure roller; 3. Heat sealing mechanism; 31. Positioning heat sealing part; 311. Connecting frame; 312. Heat sealing roller 1; 313. Connecting... 314. Rack; 32. Driven heat sealing part; 321. Spring rod two; 322. L-shaped fixing frame; 323. Heat sealing roller two; 33. Active scraping part; 331. Rotary cylinder; 332. U-shaped rotating frame one; 333. Scraper one; 34. Driven scraping part; 341. U-shaped rotating frame two; 342. Scraper two; 343. Gear ring; 4. Support mechanism; 41. Butt support part; 411. U-shaped platform; 412. Support platform; 413. Butt groove; 414. Spacing groove; 42. Cutting and cleaning part; 421. Rotary seat; 422. Scraper three. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1 An automatic packaging machine includes a conveyor table 1, an adjustment mechanism 2 is provided on the outside of the conveyor table 1, a heat sealing mechanism 3 is provided on the adjustment mechanism 2, and a support mechanism 4 is provided on the lower side of the heat sealing mechanism 3, located behind the conveyor table 1.

[0035] Please see Figure 1 The adjustment mechanism 2 includes a U-shaped frame 21 disposed on the outside of the conveyor table 1. The U-shaped frame 21 is provided with a guide and bonding part 22 for guiding and bonding the plastic film to the upper side of the carton and a lifting and cutting part 23 for cutting the plastic film. The lifting and cutting part 23 is provided with a heat-insulating bonding part 24 for isolating the heat source and guiding and bonding the plastic film to the rear side of the carton.

[0036] Please see Figure 1 , Figure 2 and Figure 4The guiding and fitting part 22 includes a cylinder 221 fixedly installed on the upper side of the U-shaped frame 21. The telescopic end of the cylinder 221 is fixedly provided with a U-shaped lifting plate 222 that moves up and down. The upper side of the U-shaped lifting plate 222 is symmetrically provided with a guide rod that slides and is connected to the horizontal section of the U-shaped frame 21. The lower side of the U-shaped lifting plate 222 is symmetrically provided with a damping roller 223 that rotates back and forth.

[0037] First, the plastic film is fed through the existing winding and conveying equipment. The stretched plastic film is vertically located behind the lifting and cutting section 23. When the carton is pushed towards the conveyor table 1 by the external pushing force (not shown in the figure) and the plastic film covering the front is stretched to form a loose "packaging bag", the cylinder 221 drives the U-shaped lifting plate 222 to move downward. The U-shaped lifting plate 222 then drives the damping roller 223 to move downward synchronously until the damping roller 223 stably presses the plastic film above the front of the carton and adheres it to the upper surface of the front of the carton. With the continuous delivery of the external pushing force, the plastic film is stably adhered and covered on the upper surface of the moving carton under the guidance and pressure of the damping roller 223.

[0038] Please see Figure 1 , Figure 2 , Figure 3 and Figure 5 The lifting and cutting unit 23 includes a cylinder 231 fixedly mounted on the upper side of the U-shaped frame 21. A fixed plate 232 that moves up and down is fixedly mounted on the telescopic end of the cylinder 231. A guide rod 2 that slides and is symmetrically mounted on the upper side of the fixed plate 232 is fixedly mounted on the left and right sides and is slidably connected to the horizontal section of the U-shaped frame 21. A spring rod 233 is fixedly mounted on the lower side of the fixed plate 232 on the left and right sides. A lifting platform 234 that moves up and down is elastically slidably mounted on the two spring rods 233. A cutter 235 is fixedly mounted on the lower side of the two spring rods 233 through a connecting plate. A wedge block 236 with an inclined surface on the lower side is fixedly mounted on the cutter 235 on the left and right sides.

[0039] The cylinder 231 can drive the fixed plate 232 to move up and down for adjustment. The fixed plate 232 then drives the spring rod 233 to move synchronously. The spring rod 233 then drives the lifting platform 234 and the cutter 235 on the lower side of the connecting plate to move synchronously. The cutter 235 then drives the wedge blocks 236 on both sides to move synchronously.

[0040] Please see Figure 1 , Figure 3 , Figure 6 and Figure 7The heat insulation bonding part 24 includes a heat insulation plate 241 fixedly installed on the lower side of the front end of the lifting platform 234. The lower end of the heat insulation plate 241 is symmetrically mounted with a rotating plate 242 via a rotating shaft. The rotating plate 242 and the lower end of the heat insulation plate 241 are elastically connected by a torsion spring. The upper ends of the two rotating plates 242 are rotatably mounted with a bonding pressure roller 243.

[0041] When the carton passes under the cutter 235 under external pushing force and is completely conveyed onto the conveyor table 1, the conveying of the carton is first stopped, and the carton is temporarily positioned by the damping roller 223, and the plastic film is stably pressed and adhered to the upper surface of the carton. Then, the cylinder 231 drives the spring rod 233 and the lifting platform 234 to move downward synchronously. The lifting platform 234 then drives the heat insulation plate 241 to move downward synchronously. The heat insulation plate 241 then drives the rotating plate 242 and the bonding pressure roller 243 to move downward through the rotating shaft 1, and the bonding pressure roller 243 is pressed downward. Roller 243 then contacts and adheres to the plastic film on the upper side and surface of the rear end of the carton. The rear end of the carton then drives the rotating plate 242 to rotate upward around the first pivot and compress the first torsion spring through the pressing of the pressing roller 243. The first torsion spring then causes the rotating plate 242 to drive the pressing roller 243 to stably press and adhere the plastic film to the rear surface of the carton through its own elasticity. As the pressing roller 243 continues to move downward, under the cooperation of the pressing roller 243 and the damping roller 223, the plastic film is stably adhered and wrapped on the outer surface of the carton.

[0042] Please see Figure 1 and Figure 8 The heat sealing mechanism 3 includes a positioning heat sealing part 31 disposed on the lifting and cutting part 23 for heat sealing the plastic film on the back side of the carton. The positioning heat sealing part 31 is provided with a driven heat sealing part 32 that is physically separated from the carton and its surface plastic film and only heat seals the rear end overlap of the plastic film on the carton surface at the moment of sealing. The positioning heat sealing part 31 is provided with an active scraping part 33 that actively scrapes off residual plastic on the surface of the corresponding heat source. The driven heat sealing part 32 is provided with a passive scraping part 34 that passively scrapes off residual plastic on the surface of the corresponding heat source.

[0043] Please see Figure 8 and Figure 9 The positioning heat sealing part 31 includes connecting frames 311 that are symmetrically fixed on the lower side of the rear end of the lifting platform 234. A heat sealing roller 312 is fixedly arranged between the lower ends of the two connecting frames 311. A connecting platform 313 is fixedly arranged on the opposite side of the two connecting frames 311. A toothed rack 314 is fixedly arranged at the front end of the connecting platform 313.

[0044] When the bonding roller 243 moves downward with the lifting platform 234 to press and bond the plastic film, the connecting frame 311 drives the heat sealing roller 312 to move downward synchronously until the heat sealing roller 312 contacts and bonds with the supporting mechanism 4 and can no longer move downward. At this time, the heat sealing roller 312 can heat seal the overlap of the plastic film behind the cutter 235.

[0045] Please see Figure 8 , Figure 9 and Figure 10 The driven heat sealing part 32 includes two connecting frames 311, which are both elastically slidably mounted on opposite sides via supports and located above the connecting platform 313. The lower end of the spring rod 321 is fixedly mounted with an L-shaped fixing frame 322 whose upper end is pressed against the inclined surface of the corresponding wedge block 236. The lower ends of the two L-shaped fixing frames 322 are fixedly mounted together with a heat sealing roller 323.

[0046] When the heat-sealing roller 312 contacts the supporting mechanism 4 and cannot move downward, the lifting platform 234 stops moving synchronously with the heat-sealing roller 312. The cylinder 231 drives the fixed plate 232 and spring rod 233 to continue moving downward. The spring rod 233 then moves relative to the lifting platform 234, driving the cutter 235 to move downward synchronously. The cutter 235 then drives the wedge block 236 to move downward synchronously until the lower inclined surface of the wedge block 236 contacts the upper end of the L-shaped fixing frame 322. Under the pressure of the wedge block 236, the L-shaped fixing frame 322 drives the spring rod 321 to move downward at an angle. The heat-sealing roller 323 then moves downward at an angle until the cutter... The blade 235 moves to its lowest position and cuts the plastic film that overlaps between the heat-sealing roller 1 312 and the heat-sealing roller 2 323. At this time, the heat-sealing roller 2 323 extends from below the heat insulation plate 241 and works with the support mechanism 4 to heat-seal the plastic film that overlaps on the lower rear side of the carton, thereby completing the overall wrapping of the plastic film on the surface of the carton. The heat insulation plate 241 can significantly reduce the impact of the heat emitted by the heat-sealing roller 2 323 on the carton and the plastic film attached to its rear surface. Furthermore, by keeping the heat-sealing roller 2 323 away from the heat insulation plate 241 and the carton when not performing heat-sealing processing, the risk of burns to the carton and the plastic film is further reduced.

[0047] The above-described operation method enables the plastic film to be stably adhered to the surface of the carton during the initial wrapping, thereby effectively avoiding the film loosening problem caused by the reserved safety distance in traditional methods. At the same time, during the film positioning and bonding process, physical isolation can be used to keep the heat sealing roller 323 away from the carton and the plastic film bonded to its surface. This allows the heat sealing roller 323 to precisely act on the film overlap area only at the moment of sealing, eliminating the risk of the heat sealing roller 323 burning the carton and the already coated film. Furthermore, the film bonding and positioning ensures the stability and bonding degree during the wrapping process. In this way, while ensuring operational safety, the flatness of the plastic seal appearance and the overall packaging quality are significantly improved.

[0048] When the plastic film wrapping of the carton surface is completed, the carton is conveyed forward by the conveyor table 1 to the thermoforming equipment (not shown in the figure) for heating and shrinking, thereby sealing the wrapped plastic film on the outer surface of the carton. At this time, the plastic film behind the heat sealing roller 312 can be covered again on the front of the new carton to be wrapped by the external winding conveyor equipment (not shown in the figure).

[0049] Please see Figure 3 and Figure 8 The active scraping unit 33 includes two connecting frames 311 fixedly mounted on opposite sides and located below the connecting platform 313. The driving ends of the two rotating cylinders 331 are jointly fixedly mounted with a U-shaped rotating frame 332 that rotates around the heat sealing roller 312. A scraper 333 is fixedly mounted on the side of the U-shaped rotating frame 332 near the heat sealing roller 312.

[0050] When it is necessary to scrape off the residual plastic on the surface of the heat sealing roller 312, the U-shaped rotating frame 332 is driven by the rotating cylinder 331 to rotate 180 degrees around the heat sealing roller 312, and the scraper 333 rotates synchronously around the heat sealing roller 312 to scrape off the residual plastic on its surface.

[0051] Please see Figure 3 , Figure 9 and Figure 10 The driven scraping part 34 includes two L-shaped fixed frames 322 whose lower ends are rotatably mounted together by a rotating shaft and rotate around the heat sealing roller 323. A scraper 342 is fixedly mounted on the side of the U-shaped rotating frame 341 near the heat sealing roller 323. Gear rings 343 are symmetrically fixed on the left and right sides of the U-shaped rotating frame 341, which are rotatably connected to the corresponding rotating shaft and mesh with the corresponding rack 314.

[0052] When the L-shaped fixing frame 322 moves the heat-sealing roller 323 downwards at an angle under the pressure of the wedge block 236, the rotating shaft 2 drives the U-shaped rotating frame 341 and the toothed ring 343 to move synchronously. The toothed ring 343 then drives the U-shaped rotating frame 341 to rotate 180 degrees around the heat-sealing roller 323 through meshing with the corresponding rack 314. The scraper 342 then rotates synchronously to the rear side of the heat-sealing roller 323 and scrapes off the residual plastic on the surface of the heat-sealing roller 323. When the cutter 235 and the wedge block 236 move upwards and reset through the cylinder 231, the spring rod 321 drives the L-shaped fixing frame 322 and the heat-sealing roller 323 to move in the opposite direction and reset. The toothed ring 343 then moves synchronously and meshes with the rack 314 again. The U-shaped rotating frame 341 then rotates in the opposite direction 180 degrees and drives the scraper 342 to scrape off the residual plastic on the surface of the heat-sealing roller 323 again.

[0053] Please see Figure 1 and Figure 11 The supporting mechanism 4 includes a docking support part 41 located on the rear side of the conveyor table 1 for supporting and heat-sealing the overlap of the plastic film in conjunction with the heat source. The docking support part 41 is provided with a cutting and cleaning part 42 for cleaning the lifting and cutting part 23.

[0054] Please see Figure 1 , Figure 3 , Figure 11 and Figure 12 The docking support part 41 includes a U-shaped platform 411 disposed on the rear side of the conveyor table 1. Supporting platforms 412 are symmetrically fixed on the upper side of the U-shaped platform 411. The upper side of the two supporting platforms 412 is provided with docking grooves 413 that are respectively docked with heat sealing roller 1 312 and heat sealing roller 2 323. The two supporting platforms 412 are provided with a common gap groove 414 that is aligned and inserted with the cutter 235.

[0055] When heat sealing roller 1 312 and heat sealing roller 2 323 respectively come into contact with the mating groove 413 on the corresponding support platform 412, heat sealing roller 1 312 and heat sealing roller 2 323 can no longer move downwards and cooperate with the corresponding mating groove 413 to heat seal the plastic film overlapping at the corresponding position. The mating groove 413 can prevent the plastic film inside from shifting left and right to a certain extent, so as to ensure the stability of the mating between heat sealing roller 1 312 and heat sealing roller 2 323 and the plastic film. Furthermore, the front mating groove 413 can further isolate heat sealing roller 2 323 from the carton and its surface plastic film, thereby further avoiding the risk of burning the carton and its surface plastic film.

[0056] Please see Figure 3 , Figure 11 and Figure 12The cutting and cleaning part 42 includes rotating seats 421 that are symmetrically fixed on the support platform 412 and located below the spacer groove 414. A scraper 422 is rotatably mounted between the two rotating seats 421 through a rotating shaft 3. The upper end of the scraper 422 is elastically rotatably connected to the corresponding rotating seat 421 through a torsion spring 2.

[0057] When the lower edge of the downward-moving cutter 235 contacts and cuts the plastic film at the corresponding position on the lower side, the lower end of the cutter 235 inserts into the spacer groove 414 and simultaneously presses down on the end of the scraper 3 422 away from the corresponding rotating base 421. As the cutter 235 continues to move downward, the scraper 3 422 deflects downward around the rotating base 421, and the lower end of the cutter 235 extends into the lower side of the scraper 3 422 until it moves to the lowest position. Under the elastic action of the corresponding torsion spring 2, the scraper 3 422 remains in close contact with the side wall of the cutter 235. When the cutter 235 moves upward and resets, the cutting edge of the cutter 235 contacts the cutting edge of the scraper 3 422 again. The scraper 3 422 then scrapes off the plastic residue on the surface of the cutting edge of the cutter 235 until the cutter 235 moves upward out of the spacer groove 414. Under the elastic action of the corresponding torsion spring 2, the scraper 3 422 deflects upward and resets to its initial position. The cutting edges of the scraper 3 422 and the cutting edge of the cutter 235 can be polished together, thereby significantly increasing the service life of the cutter 235 and the cutting quality.

[0058] The above-described operation method enables rapid cleaning of the surfaces of heat-sealing roller 1 (312), heat-sealing roller 2 (323), and the cutting edge of the cutter 235 after the heat-sealing and cutting actions are completed. This removes residual molten plastic from the surface in a timely manner, effectively preventing the accumulation of residues and ensuring that heat-sealing roller 1 (312) and heat-sealing roller 2 (323) always maintain a clean working surface and stable heat conduction performance. At the same time, it maintains the sharpness and cutting smoothness of the cutter 235, thereby ensuring the flatness of the sealing line and the thoroughness of the film cutting. This significantly improves the stability of continuous operation of the equipment and the consistency of finished product packaging quality.

[0059] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0060] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0062] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An automatic packaging machine, comprising a conveyor table, characterized in that: An adjustment mechanism is provided on the outside of the conveyor platform, a heat sealing mechanism is provided on the adjustment mechanism, and a support mechanism located on the rear side of the conveyor platform is provided below the heat sealing mechanism. The adjustment mechanism includes a U-shaped frame set on the outside of the conveyor table. The U-shaped frame is provided with a guide and bonding part for guiding and bonding the plastic film to the upper side of the carton and a lifting and cutting part for cutting the plastic film. The lifting and cutting part is provided with a heat insulation bonding part that isolates the heat source of the heat seal and guides and bonds the plastic film to the rear side of the carton. The heat sealing mechanism includes a positioning heat sealing part disposed on the lifting and cutting part for heat sealing the plastic film on the back side of the carton. The positioning heat sealing part is provided with a driven heat sealing part that is physically separated from the carton and its surface plastic film and only heat seals the rear overlap of the plastic film on the carton surface at the moment of sealing. The positioning heat sealing part is provided with an active scraping part that actively scrapes off residual plastic on the surface of the corresponding heat source. The driven heat sealing part is provided with a passive scraping part that passively scrapes off residual plastic on the surface of the corresponding heat source. The supporting mechanism includes a docking support part located on the rear side of the conveyor table for supporting and heat-sealing the overlap of the plastic film in conjunction with a heat source, and a cutting and cleaning part is provided on the docking support part for cleaning the lifting and cutting part. The lifting and cutting unit includes a cylinder two fixedly mounted on the upper side of the U-shaped frame. A fixed plate that moves up and down is fixedly mounted on the telescopic end of the cylinder two. A guide rod two that slides and connects to the horizontal section of the U-shaped frame is symmetrically mounted on the upper side of the fixed plate. A spring rod one is symmetrically mounted on the lower side of the fixed plate. A lifting platform that moves up and down is elastically slidably mounted on the two spring rods one. A cutter is fixedly mounted on the lower side of the two spring rods one through a connecting plate. A wedge-shaped block with an inclined surface on the lower side is symmetrically mounted on the cutter. The heat insulation bonding part includes a heat insulation plate fixedly installed on the lower side of the front end of the lifting platform. The lower end of the heat insulation plate is symmetrically mounted with a rotating plate through a rotating shaft. The rotating plate and the lower end of the heat insulation plate are elastically connected by a torsion spring. The upper ends of the two rotating plates are rotatably mounted with bonding pressure rollers. The positioning heat sealing part includes connecting frames that are symmetrically fixed on the lower side of the rear end of the lifting platform. A heat sealing roller is fixedly installed between the lower ends of the two connecting frames. A connecting platform is fixedly installed on the opposite side of the two connecting frames. A toothed rack is fixedly installed at the front end of the connecting platform. The driven heat sealing part includes two connecting frames that are slidably and elastically mounted on opposite sides via supports and located above the connecting platform. The lower end of the spring rod is fixedly mounted with an L-shaped fixing frame whose upper end is pressed and engaged with the inclined surface of the corresponding wedge block. The lower ends of the two L-shaped fixing frames are fixedly mounted together with a heat sealing roller. The driven scraping part includes two L-shaped fixed frames whose lower ends are rotatably mounted together by a rotating shaft and rotate around a heat sealing roller. A scraper is fixedly mounted on the side of the U-shaped rotating frame near the heat sealing roller. Gear rings that are symmetrically fixed on the left and right sides of the U-shaped rotating frame are rotatably connected to the corresponding rotating shaft and mesh with the corresponding rack.

2. The automatic packaging machine according to claim 1, characterized in that: The guiding and fitting part includes a cylinder fixedly installed on the upper side of the U-shaped frame. The telescopic end of the cylinder is fixedly equipped with a U-shaped lifting plate that moves up and down. The upper side of the U-shaped lifting plate is symmetrically equipped with a guide rod that slides and connects with the horizontal section of the U-shaped frame. The lower side of the U-shaped lifting plate is symmetrically equipped with damping rollers that rotate back and forth.

3. An automatic packaging machine according to claim 1, characterized in that: The active scraping unit includes two rotating cylinders fixedly installed on opposite sides of the connecting frame and located below the connecting platform. The driving ends of the two rotating cylinders are jointly fixedly installed with a U-shaped rotating frame that rotates around the heat sealing roller. A scraper is fixedly installed on the side of the U-shaped rotating frame that is close to the heat sealing roller.

4. An automatic packaging machine according to claim 1, characterized in that: The docking support includes a U-shaped platform located on the rear side of the conveyor table. Supporting platforms are symmetrically fixed on the upper side of the U-shaped platform. Each of the two supporting platforms has docking grooves on its upper side that are respectively docked with heat sealing roller one and heat sealing roller two. A spacer groove is provided between the two supporting platforms for alignment and insertion with the cutter.

5. An automatic packaging machine according to claim 4, characterized in that: The cutting and cleaning section includes two rotating seats that are symmetrically fixed on the support platform and located below the spacer groove. A scraper is mounted on the two rotating seats and rotates together via a rotating shaft. The upper end of the scraper is elastically rotatably connected to the corresponding rotating seat via a torsion spring.

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