Vacuum inflation packaging machine capable of continuously stretching hard box

Abstract

The utility model relates to the technical field of packaging machines, in particular to a continuous stretching hard box vacuum inflation packaging machine which directly vacuumizes the interior of a hard box and inputs inert gas, and is high in working efficiency, low in gas waste and low in use cost. Comprising a rack, a first conveying belt and a second conveying belt. The first conveying belt and the second conveying belt are used for conveying a hard box, the film stretching mechanism is installed on the rack and used for tightly supporting and flatly laying a preservative film on the hard box, the pushing cylinder is installed on the rack, the sliding table is installed on a piston rod of the pushing cylinder, the shaft pipe is rotatably installed on the sliding table, and the thin pipe is installed on the sliding table. The shaft pipe is located between the first conveying belt and the second conveying belt, a plurality of thin pipes are arranged on the shaft pipe, the ends of the thin pipes can stretch into an upper end opening of the hard box, the sealing assembly is installed on the machine frame, the sealing assembly is located on the rear side of the shaft pipe, and the sealing assembly seals the preservative film on the end opening of the hard box.

Description

Technical Field

[0001] This utility model relates to the technical field of packaging machines, and in particular to a continuous stretch rigid box vacuum gas-filling packaging machine. Background Technology

[0002] Currently, food preservation packaging has gradually evolved from vacuum packaging to modified atmosphere packaging (MAP), which involves replacing the air inside the food packaging box with another inert gas. When performing vacuum MAP on food, rigid box vacuum gas-filled packaging machines are typically used. For example, a MAP machine proposed in Chinese utility model patent CN211869788U involves feeding a packaging box from a hopper into a guide groove. Under the action of a pusher rod, the box is conveyed forward to the feeding area. After feeding, the box enters the vacuum and gas-filling mechanism. The packaging film, pulled between the film-dispensing roller and the film-receiving roller, aligns with the opening of the box, sequentially completing the vacuuming, gas-filling, heat-sealing, and shearing processes. Then, the box is pushed onto a conveyor belt driven by a chain-driven pusher rod, where it is further processed by a cylinder. The moving pressure plate blocks the front end of the packaging box. Since the horizontal support plate has an inclined angle with the forward direction of the packaging box along its length, when the pressure plate, which is parallel to the horizontal support plate, blocks the front end of the packaging box, the packaging box that first contacts the pressure plate stops moving forward under the drive of the conveyor belt, while the packaging box that does not contact the pressure plate continues to move forward. This causes the parallel packaging boxes to be staggered. The longitudinal guide rails ensure that the packaging boxes maintain a lateral distance when they are staggered in the forward direction, effectively preventing the packaging boxes from piling up and jamming. After the pressure plate rises and resets, the packaging boxes gradually and orderly enter the V-shaped guide groove, are further arranged, and are conveyed out in a line.

[0003] The vacuum air-conditioning mechanism of the aforementioned packaging machine is of the traditional type. It generally uses a vacuum pump to remove all the air inside the vacuum air-conditioning mechanism housing to create a vacuum before filling the housing with inert gas to achieve the purpose of replacing the air inside the packaging box. However, when the vacuum air-conditioning mechanism is feeding, discharging, and vacuuming again, the excess inert gas filled into its housing will escape and be wasted, resulting in high operating costs. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a continuous stretch rigid box vacuum gas-filling packaging machine that directly evacuates the interior of the rigid box and introduces inert gas, which has high working efficiency, low gas waste, and low operating cost.

[0005] This utility model discloses a continuous stretching rigid box vacuum gas-filling packaging machine, comprising a frame, a first conveyor belt and a second conveyor belt, both mounted on the frame; it also includes a push cylinder, a slide table, a shaft tube, a thin tube, a sealing assembly, and a stretching film mechanism. The first and second conveyor belts are used to transport the rigid boxes. The stretching film mechanism is mounted on the frame and is used to stretch and flatten the cling film onto the rigid boxes. The push cylinder is mounted on the frame, and the slide table is mounted on the piston rod of the push cylinder. The shaft tube is rotatably mounted on the slide table and is located between the first and second conveyor belts. Multiple thin tubes are installed on the tube, with the ends of these tubes extending into the upper port of the hard box. A sealing assembly is mounted on the frame, located behind the shaft tube, and seals the plastic wrap around the port of the hard box. During operation, conveyor belts one and two work together to transport multiple hard boxes containing food backward. A film stretching mechanism tightens the plastic wrap and lays it flat on the upper port of the hard boxes. When the hard box is transferred from conveyor belt one to conveyor belt two, both conveyor belts pause, and the piston rod of the push cylinder extends, pushing the slide and shaft tube upward, causing the shaft tube to... Above conveyor belts one and two, the shaft tube drives multiple thin tubes to rotate. The ends of these thin tubes lift the plastic wrap from below and insert it into multiple hard-shell boxes. A vacuum pump operates, extracting air from the hard-shell boxes through pipes, the shaft tube, and the multiple thin tubes. Inert gas is introduced into the hard-shell boxes through pipes, the shaft tube, and the multiple thin tubes. During the air extraction and exchange process in the hard-shell boxes, the sealing assembly heat-seals the plastic wrap onto the rear of the upper port of the hard-shell box. After the hard-shell box completes the air extraction and exchange, the shaft tube reverses, pulling the ends of the multiple thin tubes out of the hard-shell box, and the push cylinder retracts. The slide and shaft tube are lowered below conveyor belt one and conveyor belt two. At this time, the sealing assembly heat-seals the plastic wrap onto the front part of the upper end face of the hard box, completing the full sealing of the upper port of the hard box. Conveyor belt one and conveyor belt two resume operation, conveying the sealed hard box backward. Compared with the existing technology, the inside of the hard box is directly vacuumed and inert gas is introduced. The vacuuming and gas exchange time is shorter and the working efficiency is higher. Since inert gas is directly filled into the hard box, there is no need to fill the shell of the vacuum air conditioning mechanism, so there is less waste of inert gas and the operating cost is low.

[0006] Preferably, it also includes a drive motor and a gear ring. The drive motor is mounted on the slide, and the main gear is concentrically mounted on the output shaft of the drive motor. The gear ring is concentrically mounted on the shaft tube and meshes with the drive motor. The drive motor drives the main gear to rotate, the main gear meshes and drives the gear ring to rotate, and the gear ring drives the shaft tube to rotate, realizing the flipping drive of the shaft tube and multiple thin tubes. The technology is mature and reliable.

[0007] Preferably, the assembly also includes a rotary joint, a three-way valve, a vacuum pump, and an atmosphere regulating unit. The rotary joint is installed on the end of the shaft tube and is connected to the shaft tube. The connector of the rotary joint is connected to the first channel of the three-way valve through a pipeline. The three-way valve is installed on a slide table. The second channel of the three-way valve is connected to the connector of the vacuum pump through a pipeline. The third channel of the three-way valve is connected to the connector of the atmosphere regulating unit through a pipeline. By setting the rotary joint, the shaft tube can maintain communication with the first channel of the three-way valve through the pipeline when rotating. When evacuating, the three-way valve switches to connect the vacuum pump, the three-way valve, the rotary joint, and the shaft tube. The vacuum pump operates to extract air from multiple hard boxes. When exchanging air, the three-way valve switches to connect the atmosphere regulating unit, the three-way valve, the rotary joint, and the shaft tube. The atmosphere regulating unit operates to input inert gas into multiple hard boxes, realizing the switching of working states and providing good practicality.

[0008] Preferably, the sealing assembly includes a beam frame, a second pusher cylinder, an electric turntable, and a sealing mold. The beam frame is mounted on the machine frame, the fixed end of the second pusher cylinder is mounted on the beam frame, and the lower end of the piston rod of the second pusher cylinder is mounted on the electric turntable. The output shaft of the electric turntable is connected to the middle of the sealing mold, and one end of the sealing mold has a notch to avoid multiple thin tubes. When the ends of the multiple thin tubes are inserted into multiple hard boxes for evacuation and ventilation, the piston rod of the second pusher cylinder extends and pushes the sealing mold downward, causing the sealing mold to press the plastic wrap tightly against the hard box. At the upper port, the multiple notches of the sealing mold avoid multiple thin tubes, performing the first sealing of the hard box. After the ends of the multiple thin tubes are pulled out from the multiple hard boxes, the piston rod of the second push cylinder retracts, the electric turntable drives the sealing mold to rotate 180 degrees, and the piston rod of the second push cylinder extends again, so that the sealing mold performs the second sealing of the hard box, closing the gaps left during the first sealing, thereby completing the full sealing of the hard box. This can minimize air leakage between the hard box and the plastic wrap and reduce the waste of inert gas.

[0009] Preferably, the stretch film mechanism includes a plastic wrap loading shaft, a first guide roller, a waste roll take-up shaft, a second guide roller, and two pressing roller assemblies. The plastic wrap loading shaft and the first guide roller are mounted on the frame via a bracket, and the waste roll take-up shaft and the second guide roller are also mounted on the frame via a bracket. The plastic wrap loading shaft and the first guide roller are located at the front of the shaft tube, and the waste roll take-up shaft and the second guide roller are located at the rear of the shaft tube. The first guide roller is located below the plastic wrap loading shaft, and the second guide roller is located below the waste roll take-up shaft. The plastic wrap loading shaft is used to load the plastic wrap roll, the first guide roller is used to guide the plastic wrap, and the waste roll take-up shaft... This device is used to collect plastic wrap waste. Guide roller 2 is used to guide the plastic wrap waste. Two pressure roller assemblies are located between the plastic wrap loading shaft and the waste roll-up shaft. The two pressure roller assemblies stretch the plastic wrap and lay it flat on the hard box. The plastic wrap loading shaft is loaded with plastic wrap rolls. After being guided by guide roller 1, the plastic wrap is pressed tightly onto the hard box by the two pressure roller assemblies, so that the plastic wrap is stretched and tightened on multiple hard boxes. The waste roll-up shaft rolls up the cut plastic wrap fertilizer. Guide roller 2 rolls and guides the plastic wrap fertilizer, realizing the conveying, stretching and flat laying of plastic wrap. The technology is mature and has good practicality.

[0010] Preferably, the film pressing roller assembly includes two arm plates, two springs, and a film pressing roller. The middle parts of the two arm plates are rotatably connected to the two sides of the frame, one end of each of the two springs is rotatably connected to the lower end of the two arm plates, and the other end of each spring is rotatably connected to the frame. The two ends of the film pressing roller are connected to the upper ends of the two arm plates. The elastic force of the two springs pushes the lower ends of the two arm plates upward, thereby causing the upper ends of the two arm plates to push the film pressing roller downward, so that the film pressing roller presses the plastic wrap downward, achieving stretching and flattening of the plastic wrap, which is practical.

[0011] Preferably, it also includes a protective cover, which is mounted on the frame and covers the shaft tube and sealing assembly; by setting the protective cover to protect and seal the shaft tube and sealing assembly, the waste of inert gas is further reduced.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: the vacuuming and inert gas input are directly applied to the inside of the hard box, the vacuuming and gas exchange time is shorter, the working efficiency is higher, and since the inert gas is directly filled into the hard box, there is no need to fill the shell of the vacuum air conditioning mechanism, so there is less waste of inert gas and the cost of use is low. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is an axonometric structural diagram of the utility model;

[0015] Figure 3 This is a structural schematic diagram of the working state of this utility model;

[0016] Figure 4 It is a structural diagram of components such as the push cylinder, slide, shaft tube, thin tube, and drive motor;

[0017] Figure 5 This is a structural diagram of the pressure roller assembly and other structures;

[0018] Figure 6 This is a structural diagram of components such as sealing parts.

[0019] The following components are labeled in the attached diagram: 1. Frame; 2. Conveyor Belt 1; 3. Conveyor Belt 2; 4. Push Cylinder; 5. Slide Table; 6. Shaft Tube; 7. Thin Tube; 8. Drive Motor; 9. Gear Ring; 10. Rotary Joint; 11. Three-Way Valve; 12. Vacuum Pump; 13. Controlled Atmosphere Unit; 14. Beam Frame; 15. Push Cylinder 2; 16. Electric Turntable; 17. Sealing Mold; 18. Plastic Wrap Loading Shaft; 19. Guide Roller 1; 20. Waste Roll Reel Shaft; 21. Guide Roller 2; 22. Arm Plate; 23. Spring; 24. Pressing Roller; 25. Protective Cover. Detailed Implementation

[0020] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention. Example 1

[0021] like Figures 1 to 4As shown, a continuous stretching rigid box vacuum packaging machine includes a frame 1, a first conveyor belt 2, and a second conveyor belt 3, which are mounted on the frame 1. It also includes a push cylinder 4, a slide table 5, a shaft tube 6, thin tubes 7, a sealing assembly, and a stretching film mechanism. The first and second conveyor belts 2 and 3 transport the rigid boxes. The stretching film mechanism, mounted on the frame 1, stretches the plastic wrap tightly and flattened on the rigid box. The push cylinder 4 is mounted on the frame 1, and the slide table 5 is mounted on the piston rod of the push cylinder 4. The shaft tube 6 is rotatably mounted on the slide table 5 and is located between the first and second conveyor belts 2 and 3. Multiple thin tubes 7 are provided on the shaft tube 6, the ends of which can extend into the upper port of the rigid box. The sealing assembly, mounted on the frame 1 and located behind the shaft tube 6, seals the plastic wrap within the rigid box. The box also includes a drive motor 8 and a gear ring 9. The drive motor 8 is mounted on the slide table 5, and the main gear is concentrically mounted on the output shaft of the drive motor 8. The gear ring 9 is concentrically mounted on the shaft tube 6 and meshes with the drive motor 8. The box also includes a rotary joint 10, a three-way valve 11, a vacuum pump 12, and an atmosphere regulating unit 13. The rotary joint 10 is mounted on the end of the shaft tube 6 and is connected to the shaft tube 6. The connector of the rotary joint 10 is connected to the first channel of the three-way valve 11 through a pipeline. The three-way valve 11 is mounted on the slide table 5. The second channel of the three-way valve 11 is connected to the connector of the vacuum pump 12 through a pipeline. The third channel of the three-way valve 11 is connected to the connector of the atmosphere regulating unit 13 through a pipeline. The box also includes a protective cover 25, which is mounted on the frame 1 and covers the shaft tube 6 and the sealing assembly.

[0022] During operation, conveyor belts 2 and 3 work together to transport multiple food-filled hard boxes backward. A stretching film mechanism tightly lays the plastic wrap across the upper ends of the boxes. Once the boxes are transferred from conveyor belt 2 to conveyor belt 3, both conveyor belts pause. The piston rod of push cylinder 4 extends, pushing slide 5 and shaft tube 6 upward, causing shaft tube 6 to rise above conveyor belts 2 and 3. Drive motor 8 drives the main gear to rotate, which in turn drives gear ring 9 to rotate. Gear ring 9 then drives shaft tube 6 to rotate, achieving a flipping drive for shaft tube 6. Shaft tube 6 then drives multiple... As the thin tubes 7 rotate, their ends lift the plastic wrap from below and insert it into multiple hard-shell boxes. A vacuum pump operates, extracting air from the boxes through pipes, shaft tube 6, and the thin tubes 7. Inert gas is introduced into the boxes through pipes, shaft tube 6, and the thin tubes 7. During the evacuation and ventilation process, the sealing assembly heat-seals the plastic wrap onto the rear of the upper port of the box. After the evacuation and ventilation are complete, shaft tube 6 reverses, pulling the ends of the thin tubes 7 out of the boxes. The push cylinder 4 retracts, causing the slide 5 and shaft tube 6 to descend below the conveyor belt 2. Conveyor belt 2 (3) then heat-seals the cling film onto the front of the upper surface of the hard box, completing the full sealing of the upper port of the hard box. Conveyor belts 1 (2) and 2 (3) resume operation, conveying the sealed hard box backward. Compared with existing technologies, this method directly evacuates and introduces inert gas into the hard box, resulting in shorter evacuation and ventilation times and higher work efficiency. Since inert gas is directly filled into the hard box, there is no need to fill the housing of the vacuum ventilation mechanism, thus reducing inert gas waste and lowering operating costs. By setting a rotary joint 10, the rotation of the shaft tube 6 allows the tube to pass through... The first channel of the three-way valve 11 is kept connected. When evacuating, the three-way valve 11 switches to connect the vacuum pump 12, the three-way valve 11, the rotary joint 10, and the shaft tube 6. The vacuum pump 12 runs to extract air from multiple hard boxes. When exchanging air, the three-way valve 11 switches to connect the atmosphere regulating unit 13, the three-way valve 11, the rotary joint 10, and the shaft tube 6. The atmosphere regulating unit 13 runs to input inert gas into multiple hard boxes, realizing the switching of working states. By setting a protective cover 25 to protect and seal the shaft tube 6 and the sealing assembly, the waste of inert gas is further reduced. Example 2

[0023] like Figure 6 As shown, based on Embodiment 1, the sealing assembly includes a beam frame 14, a second pusher cylinder 15, an electric turntable 16, and a sealing mold 17. The beam frame 14 is mounted on the frame 1, the fixed end of the second pusher cylinder 15 is mounted on the beam frame 14, the lower end of the piston rod of the second pusher cylinder 15 is mounted on the electric turntable 16, the output shaft of the electric turntable 16 is connected to the middle of the sealing mold 17, and one end of the sealing mold 17 is provided with a notch to avoid multiple thin tubes 7.

[0024] When the ends of multiple thin tubes 7 are inserted into multiple hard boxes for evacuation and ventilation, the piston rod of the push cylinder 2 15 extends and pushes the sealing mold 17 downward, so that the sealing mold 17 presses the plastic wrap tightly against the upper port of the hard box, and the multiple notches of the sealing mold 17 avoid the multiple thin tubes 7, thus performing the first sealing of the hard box. After the ends of multiple thin tubes 7 are pulled out from the multiple hard boxes, the piston rod of the push cylinder 2 15 retracts, the electric turntable 16 drives the sealing mold 17 to rotate 180 degrees, and the piston rod of the push cylinder 2 15 extends again, so that the sealing mold 17 performs the second sealing of the hard box, closing the gaps left during the first sealing, thereby completing the full sealing of the hard box, which can minimize air leakage between the hard box and the plastic wrap and reduce the waste of inert gas. Example 3

[0025] like Figures 1 to 3 and Figure 5 As shown, based on Embodiment 1, the stretch film mechanism includes a plastic wrap loading shaft 18, a first guide roller 19, a waste roll take-up shaft 20, a second guide roller 21, and two pressing roller assemblies. The plastic wrap loading shaft 18 and the first guide roller 19 are mounted on the frame 1 via brackets, and the waste roll take-up shaft 20 and the second guide roller 21 are also mounted on the frame 1 via brackets. The plastic wrap loading shaft 18 and the first guide roller 19 are located on the front side of the shaft tube 6, and the waste roll take-up shaft 20 and the second guide roller 21 are located on the rear side of the shaft tube 6. The first guide roller 19 is located below the plastic wrap loading shaft 18, and the second guide roller 21 is located below the waste roll take-up shaft 20. The plastic wrap loading shaft 18 is used to load the plastic wrap roll. Guide roller 19 is used to guide the plastic wrap, waste roll-up shaft 20 is used to roll up the plastic wrap waste, guide roller 21 is used to guide the plastic wrap waste, and two pressing roller assemblies are located between the plastic wrap loading shaft 18 and the waste roll-up shaft 20. The two pressing roller assemblies stretch the plastic wrap and lay it flat on the hard box. The pressing roller assembly includes two arm plates 22, two springs 23 and pressing roller 24. The middle parts of the two arm plates 22 are rotatably connected to the two sides of the frame 1, one end of the two springs 23 is rotatably connected to the lower end of the two arm plates 22, and the other end of the two springs 23 is rotatably connected to the frame 1. The two ends of the pressing roller 24 are connected to the upper ends of the two arm plates 22.

[0026] The plastic wrap loading shaft 18 loads a plastic wrap roll. After being guided by the first guide roller 19, the plastic wrap is pressed onto the hard box by two pressing roller assemblies, so that the plastic wrap is stretched and tightened on multiple hard boxes. The waste material winding shaft 20 winds up the cut plastic wrap fertilizer. The second guide roller 21 guides the plastic wrap fertilizer to roll. The elastic force of the two springs 23 pushes the lower ends of the two arm plates 22 upward, so that the upper ends of the two arm plates 22 push the pressing roller 24 downward, so that the pressing roller 24 presses the plastic wrap downward, realizing the conveying, stretching and flat laying of the plastic wrap.

[0027] like Figures 1 to 6As shown, this utility model discloses a continuous stretching hard box vacuum gas-filling packaging machine. During operation, conveyor belt 2 and conveyor belt 3 work together to convey multiple hard boxes containing food backwards. Two pressure rollers 24 stretch and flatten the plastic wrap onto the upper ends of the hard boxes. After the hard boxes are transferred from conveyor belt 2 to conveyor belt 3, conveyor belts 2 and 3 pause. Then, the piston rod of push cylinder 4 extends, pushing slide 5 and shaft tube 6 upwards, making shaft tube 6 higher than conveyor belts 2 and 3. Drive motor 8 drives shaft tube 6 through gear ring 9, causing multiple thin tubes 7 to rotate. The ends of the thin tubes 7 lift the plastic wrap from below and insert it into the hard boxes. The piston rod of push cylinder 2 15 extends, pushing sealing mold 17 downwards, causing sealing mold 17 to press the plastic wrap tightly onto the upper ends of the hard boxes. The multiple notches of sealing mold 17 also avoid the multiple thin tubes 7, thus ensuring the food is properly sealed. The boxes are sealed for the first time. Then, the vacuum pump 12 operates, extracting air from multiple hard boxes through the three-way valve 11, rotary joint 10, shaft tube 6, and multiple thin tubes 7. The atmosphere control unit 13 operates, supplying inert gas to multiple hard boxes through the three-way valve 11, rotary joint 10, shaft tube 6, and multiple thin tubes 7. The drive motor 8 drives the shaft tube 6 to reverse through the gear ring 9, pulling the ends of the multiple thin tubes 7 out of the hard boxes. The push cylinder 4 retracts, causing the slide table 5 and shaft tube 6 to descend below the first conveyor belt 2 and the second conveyor belt 3. The piston rod of the second push cylinder 15 retracts, and the electric turntable 16 drives the sealing mold 17 to rotate 180 degrees. The piston rod of the second push cylinder 15 extends again, causing the sealing mold 17 to seal the hard boxes a second time, closing the gaps left from the first sealing, thus completing the full sealing of the hard boxes. Finally, the first conveyor belt 2 and the second conveyor belt 3 resume operation, conveying the sealed hard boxes backward.

[0028] The main functions achieved by this utility model are:

[0029] 1. The internal cavity of the hard box is directly evacuated and inert gas is introduced, resulting in shorter evacuation and gas exchange times and higher work efficiency;

[0030] 2. Inert gas is directly filled into the rigid box, eliminating the need to fill the housing of the vacuum air conditioning mechanism, thus reducing inert gas waste and lowering operating costs;

[0031] 3. It can recycle plastic wrap waste.

[0032] This utility model discloses a continuous stretching hard box vacuum gas-filling packaging machine. Its installation, connection, and setup methods are all common mechanical methods, and any method that achieves the desired beneficial effect can be implemented. The frame 1, conveyor belt one 2, conveyor belt two 3, push cylinder 4, shaft tube 6, thin tube 7, drive motor 8, gear ring 9, rotary joint 10, three-way valve 11, vacuum pump 12, atmosphere regulating unit 13, push cylinder two 15, electric turntable 16, sealing mold 17, cling film loading shaft 18, guide roller one 19, waste roll take-up shaft 20, guide roller two 21, arm plate 22, spring 23, pressure roller 24, and protective cover 25 of this continuous stretching hard box vacuum gas-filling packaging machine are all commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative effort from those skilled in the art.

[0033] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A continuous stretch rigid box vacuum gas-filling packaging machine, comprising a frame (1), a first conveyor belt (2) and a second conveyor belt (3), the first conveyor belt (2) and the second conveyor belt (3) being mounted on the frame (1); characterized in that, It also includes a push cylinder (4), a slide (5), a shaft tube (6), a thin tube (7), a sealing assembly, and a stretching film mechanism. Conveyor belt one (2) and conveyor belt two (3) are used to transport the hard box. The stretching film mechanism is installed on the frame (1) and is used to stretch the plastic film and lay it flat on the hard box. The push cylinder (4) is installed on the frame (1). The slide (5) is installed on the piston rod of the push cylinder (4). The shaft tube (6) is rotatably installed on the slide (5). The shaft tube (6) is located between conveyor belt one (2) and conveyor belt two (3). Multiple thin tubes (7) are provided on the shaft tube (6). The ends of the multiple thin tubes (7) can extend into the upper port of the hard box. The sealing assembly is installed on the frame (1) and is located behind the shaft tube (6). The sealing assembly seals the plastic film on the port of the hard box.

2. The continuous stretch rigid box vacuum gas-flushing packaging machine as described in claim 1, characterized in that, It also includes a drive motor (8) and a gear ring (9). The drive motor (8) is mounted on the slide table (5). The output shaft of the drive motor (8) is concentrically mounted with the main gear. The gear ring (9) is concentrically mounted on the shaft tube (6). The gear ring (9) meshes with the drive motor (8).

3. The continuous stretch rigid box vacuum gas-flushing packaging machine as described in claim 1, characterized in that, It also includes a rotary joint (10), a three-way valve (11), a vacuum pump (12), and an atmosphere control unit (13). The rotary joint (10) is installed on the end of the shaft tube (6) and is connected to the shaft tube (6). The joint of the rotary joint (10) is connected to the first channel of the three-way valve (11) through a pipeline. The three-way valve (11) is installed on the slide table (5). The second channel of the three-way valve (11) is connected to the joint of the vacuum pump (12) through a pipeline. The third channel of the three-way valve (11) is connected to the joint of the atmosphere control unit (13) through a pipeline.

4. The continuous stretch rigid box vacuum gas-flushing packaging machine as described in claim 1, characterized in that, The sealing assembly includes a beam frame (14), a second pusher cylinder (15), an electric turntable (16), and a sealing mold (17). The beam frame (14) is mounted on the frame (1). The fixed end of the second pusher cylinder (15) is mounted on the beam frame (14). The lower end of the piston rod of the second pusher cylinder (15) is mounted on the electric turntable (16). The output shaft of the electric turntable (16) is connected to the middle of the sealing mold (17). One end of the sealing mold (17) is provided with a notch to avoid multiple thin tubes (7).

5. The continuous stretch rigid box vacuum gas-flushing packaging machine as described in claim 1, characterized in that, The film stretching mechanism includes a film loading shaft (18), a guide roller one (19), a waste roll take-up shaft (20), a guide roller two (21), and two film pressing roller assemblies. The film loading shaft (18) and the guide roller one (19) are mounted on the frame (1) via brackets. The waste roll take-up shaft (20) and the guide roller two (21) are also mounted on the frame (1) via brackets. The film loading shaft (18) and the guide roller one (19) are located on the front side of the shaft tube (6), and the waste roll take-up shaft (20) and the guide roller two (21) are located on the back side of the shaft tube (6). On the rear side, guide roller one (19) is located below the plastic wrap loading shaft (18), and guide roller two (21) is located below the waste material take-up shaft (20). The plastic wrap loading shaft (18) is used to load the plastic wrap roll, guide roller one (19) is used to guide the plastic wrap, the waste material take-up shaft (20) is used to take up the plastic wrap waste, and guide roller two (21) is used to guide the plastic wrap waste. The two pressing roller assemblies are located between the plastic wrap loading shaft (18) and the waste material take-up shaft (20). The two pressing roller assemblies stretch the plastic wrap and lay it flat on the hard box.

6. The continuous stretch rigid box vacuum gas-flushing packaging machine as described in claim 5, characterized in that, The film pressing roller assembly includes two arm plates (22), two springs (23), and a film pressing roller (24). The middle parts of the two arm plates (22) are rotatably connected to the two sides of the frame (1), one end of the two springs (23) is rotatably connected to the lower end of the two arm plates (22), and the other end of the two springs (23) is rotatably connected to the frame (1). The two ends of the film pressing roller (24) are connected to the upper ends of the two arm plates (22).

7. The continuous stretch rigid box vacuum gas-flushing packaging machine as described in claim 1, characterized in that, It also includes a protective cover (25), which is mounted on the frame (1) and covers the shaft tube (6) and the sealing assembly.

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