Side edge pulling mechanism of a four-side sealing packaging machine

Abstract

The present application relates to the technical field of packaging machine, specifically to a four-edge sealing packaging machine side edge pulling mechanism, which comprises a packaging conveying table, an upper pulling assembly and a lower pulling assembly capable of lifting and moving at a side edge position of the packaging conveying table, the positions of the upper pulling assembly and the lower pulling assembly correspond to each other, the inside of the upper pulling assembly is provided with an upper half pressing column, and the inside of the lower pulling assembly is provided with a lower half pressing column; the four-edge sealing packaging machine side edge pulling mechanism can tighten the packaging bag through side edge pulling, and compared with the heat-shrink packaging equipment with hot air circulation heating in the traditional technology, the four-edge sealing packaging machine side edge pulling mechanism can reduce energy consumption and carbon emission.

Description

Technical Field

[0001] This invention relates to the field of packaging machine technology, specifically to a side pull-out mechanism for a four-side sealing packaging machine. Background Technology

[0002] Heat shrink four-side sealing packaging machines are mainstream equipment in the plastic packaging industry and are widely used in food, pharmaceutical, and daily chemical fields. They use hot air to shrink the packaging film to adhere tightly to the product surface, creating a beautiful, moisture-proof, and pollution-proof packaging effect. However, the industry currently suffers from high energy consumption: more than 80% of heat shrink packaging machines on the market use traditional hot air circulation heating methods, with a thermal efficiency of only 30%-40%. A single machine consumes as much as 100,000-150,000 kWh of electricity per year, resulting in serious energy waste and high carbon emissions. Summary of the Invention

[0003] The purpose of this invention is to provide a side pull-out mechanism for a four-side sealing packaging machine, which replaces the traditional hot air shrink system by mechanically pulling and tightening, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a side-pull-out mechanism for a four-side sealing packaging machine, comprising a packaging conveyor table and an upper pull-out assembly and a lower pull-out assembly that are vertically movable and disposed on the side of the packaging conveyor table. The upper pull-out assembly and the lower pull-out assembly are vertically aligned. The upper pull-out assembly has an upper half-pressure column inside, and the lower pull-out assembly has a lower half-pressure column inside. One end of the packaging bag extends between the upper pull-out assembly and the lower pull-out assembly. When the upper pull-out assembly and the lower pull-out assembly come close to each other, the upper half-pressure column and the lower half-pressure column cooperate to clamp the end of the packaging bag. The ends of the upper half-pressure column and the lower half-pressure column are provided with a shaft drive structure. When the upper half-pressure column and the lower half-pressure column clamp the packaging bag, the shaft drive structure can drive the upper half-pressure column and the lower half-pressure column to rotate along the same axis. The upper pull-out assembly and the lower pull-out assembly are respectively provided with a heat-sealing cutter that is vertically movable and can cut the packaging bag and heat-seal it.

[0005] The combined shaft drive structure includes a combined end and a mating end. The combined end is fixedly located at the end of the upper half-pressure column, and the mating end is fixedly located at the end of the lower half-pressure column. Both the combined end and the mating end have semi-circular grooves on their surfaces. Both the upper pull-out assembly and the lower pull-out assembly have semi-circular retaining edges fixedly provided. Both the semi-circular grooves and the semi-circular retaining edges are semi-circular and have a limiting fit.

[0006] Both the combined end and the mating end are fixedly provided with driving sleeves. When the upper and lower pressure columns clamp the packaging bag, the driving sleeves corresponding to the combined end and the mating end are in a coaxial position. The lower pull-out assembly is equipped with a driving shaft. The driving shaft can rotate and move axially. When the upper and lower pressure columns clamp the packaging bag, the driving shaft first moves axially to insert into the driving sleeve, and then drives the upper and lower pressure columns to rotate along the same axis by rotation.

[0007] The surfaces of the combined end and the mating end are each embedded with a first alignment magnet, and the upper pull-out assembly and the lower pull-out assembly are each embedded with a second alignment magnet; the first alignment magnet and the second alignment magnet are magnetically attracted and positioned so that the upper half-pressing column and the lower half-pressing column remain in a fixed position when separated.

[0008] The pull-down assembly is equipped with a drive unit, which can control the rotation and axial movement of the drive shaft.

[0009] The drive unit includes a circular shaft and a piston unit. The circular shaft is coaxially and fixedly connected to the drive shaft. The piston unit is installed at the end of the circular shaft. The circular shaft can rotate relative to the piston unit, and the piston unit can drive the circular shaft to move axially. An axial drive cylinder is provided outside the piston unit. The axial drive cylinder and the piston unit cooperate to form a cylinder structure to drive the circular shaft axially. A fixing frame is fixedly provided at the end of the axial drive cylinder. A side frame plate is fixedly provided on the fixing frame, and the side frame plate is fixedly installed on the lower pull-out assembly.

[0010] A limiting groove is provided on the circular shaft portion, and a gear disk unit is sleeved on the outside of the circular shaft portion. The gear disk unit can drive the circular shaft portion to rotate by cooperating with the limiting groove, and at the same time, the gear disk unit can move axially relative to the circular shaft portion. A servo motor is fixedly installed on the lower pull-out assembly. The servo motor is provided with a drive tooth, which meshes with the gear disk unit to drive the gear disk unit to rotate.

[0011] The inner side of the toothed disc unit is provided with a split inner disc, which can rotate relative to the toothed disc unit. A connecting spring is provided between the split inner disc and the toothed disc unit, and the toothed disc unit applies a rotational driving force to the split inner disc through the connecting spring.

[0012] A fixed plate is fixedly mounted on the gear disc unit, and a positioning double shaft is fixedly mounted on the fixed plate. A triangular jack is provided on the outside of the positioning double shaft, and a jack piston is fixedly mounted on the triangular jack. An integrated cylinder is provided on the split inner disc, and the jack piston is located inside the integrated cylinder. A tension spring is provided below the jack piston, and the tension spring applies tension to the jack piston. An inner disc air passage is opened in the split inner disc, and a frame air passage is opened in the fixed frame sleeve. The frame air passage and the inner disc air passage can maintain gas communication during the rotation of the split inner disc relative to the fixed frame sleeve. When compressed gas is input into the frame air passage, the compressed gas will enter the integrated cylinder and drive the triangular jack to extend, thereby returning and fixing the position between the split inner disc and the gear disc unit.

[0013] An impact toothed ring is formed on the surface of the inner disc of the split structure. An impact pry plate is rotatably mounted on the side frame plate. A boss plate is fixedly set on the side frame plate. A return spring is set between the boss plate and the impact pry plate. The supporting elastic force of the return spring prevents the impact pry plate and the impact toothed ring from contacting each other. An impactor is fixedly set on the side frame plate. The impactor can apply an impact force to the impact pry plate, thereby causing the impact pry plate to rotate. It also cooperates with the impact toothed ring to apply a rotational impact force to the inner disc of the split structure.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. The four-side sealing packaging machine of the present invention has a side pull-out mechanism, which tightens the packaging bag by pulling out the side. Compared with the heat shrink packaging equipment with hot air circulation heating in the traditional technology, it can reduce energy consumption and carbon emissions. 2. The present invention, through the combination of the upper half pressure column, the lower half pressure column and the shaft drive structure, can clamp the packaging bag and pull it out and tighten it. Compared with the traditional clamping and rotating structure design, the upper half pressure column and the lower half pressure column have a larger and freer opening and closing distance, which is convenient for processing and placement.

[0015] 3. This invention, through the combination of a split inner disc, a triangular top tongue, and an impact skid, can generate pulse-like impact fluctuations in the pulling force when the packaging bag is tightened to a certain extent. The vibration caused by the pulse fluctuations converts static friction into dynamic friction with less resistance. Furthermore, the film of the packaging bag and the surface of the packaged item form micro-cushions through oscillation, reducing contact friction, promoting the movement of the packaging bag along the surface of the packaged item, and improving the packaging fit. Moreover, the above structural design allows the toothed disc unit and the split inner disc to be precisely positioned and fixed when the work stops, facilitating the positioning control of the servo motor. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2This is a schematic diagram of the structure of the fixing plate of the present invention.

[0018] Figure 3 This is another schematic diagram of the overall structure of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure at the connecting spring of the present invention.

[0020] Figure 5 This is a half-sectional schematic diagram of the upper and lower pull-out components of the present invention.

[0021] Figure 6 This is a half-sectional schematic diagram of the combined end and mating end of the present invention.

[0022] Figure 7 This is a half-sectional schematic diagram of the toothed disc unit of the present invention.

[0023] Figure 8 This is a schematic diagram of the combined end and mating end structure of the present invention.

[0024] Figure 9 This is a schematic diagram of the combined state of the upper and lower pressure columns of the present invention.

[0025] Figure 10 This is a half-sectional view of the fixing plate of the present invention.

[0026] Figure 11 This is a half-sectional schematic diagram of the impact skid plate of the present invention.

[0027] Figure 12 This is a partial half-section schematic diagram of the impact skid plate of the present invention.

[0028] In the diagram: 1. Packaging conveyor; 2. Upper pull-out assembly; 3. Lower pull-out assembly; 4. Upper half-pressure column; 5. Lower half-pressure column; 6. Heat-sealing cutter; 7. Combined end; 8. Mating end; 701. Semi-arc groove; 702. Semi-arc retaining ridge; 703. Drive sleeve; 704. Drive shaft; 705. First alignment magnet; 706. Second alignment magnet; 301. Round shaft; 302. Piston unit; 303. Axial drive cylinder; 304. Fixed frame sleeve; 305. Side frame plate; 306. Limiting slide groove; 9. Gear unit; 307. Servo Motor; 308, Drive pinion; 901, Split inner disc; 902, Connecting spring; 903, Fixing plate; 904, Positioning dual shafts; 905, Triangular top tongue; 906, Top tongue piston; 907, Integrated cylinder body; 908, Tension spring; 909, Inner disc air passage; 910, Frame air passage; 911, Impact gear ring; 912, Impact skid plate; 913, Boss plate; 914, Return spring; 915, Impactor; 101, Limiting frame; 102, Lowering baffle; 103, Lifting gear column; 707, Positioning blind hole; 801, Positioning shaft. Detailed Implementation

[0029] 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.

[0030] Please see Figures 1 to 12 This invention provides a technical solution: a side-pull-out mechanism for a four-side sealing packaging machine, comprising a packaging conveyor table 1 and an upper pull-out assembly 2 and a lower pull-out assembly 3, which are movable and liftable and are located on the side of the packaging conveyor table 1; as shown... Figure 1 As shown, a limit frame 101 is provided on the packaging conveyor 1. The limit frame 101 can limit and clamp the packaged items according to their size. A pressure baffle 102 is also provided above the packaging conveyor 1. A lifting gear 103 is fixedly provided on the pressure baffle 102. The lifting gear 103 controls the lifting and lowering of the pressure baffle 102. The pressure baffle 102 moves down and presses on the packaged items. The pressure baffle 102 and the packaging bag on the surface of the packaged items do not come into squeezing contact, thus avoiding excessive friction. The pressure baffle 102 only provides a limiting function to prevent the packaged items from flipping over during the process of pulling and tightening the packaging bag on the surface.

[0031] like Figure 1 and Figure 3 As shown, lifting gears 103 are fixedly installed on the lower baffle 102, the upper pull-out assembly 2, and the lower pull-out assembly 3, respectively. The lifting gears 103 control the lifting and lowering actions of the lower baffle 102, the upper pull-out assembly 2, and the lower pull-out assembly 3, respectively. The lifting control component that works in cooperation with the lifting gears 103 is omitted in this invention and is existing technology.

[0032] The upper pull-out assembly 2 and the lower pull-out assembly 3 are positioned vertically. The upper pull-out assembly 2 has an upper half-pressure post 4 inside, and the lower pull-out assembly 3 has a lower half-pressure post 5 inside. Both the upper half-pressure post 4 and the lower half-pressure post 5 are semi-cylindrical structures. When the upper half-pressure post 4 and the lower half-pressure post 5 come into contact and cooperate, they can form a complete cylindrical structure. One end of the packaging bag extends between the upper pull-out assembly 2 and the lower pull-out assembly 3. When the upper pull-out assembly 2 and the lower pull-out assembly 3 come close to each other, the upper half-pressure post 4 and the lower half-pressure post 5 can cooperate to clamp the end of the packaging bag.

[0033] The upper half-pressure column 4 and the lower half-pressure column 5 are equipped with a shaft drive structure at their ends. When the upper half-pressure column 4 and the lower half-pressure column 5 clamp the packaging bag, the shaft drive structure can drive the upper half-pressure column 4 and the lower half-pressure column 5 to rotate along the same axis. The upper pull-out assembly 2 and the lower pull-out assembly 3 are respectively equipped with a heat-sealing cutter 6 that can be raised and lowered. The heat-sealing cutter 6 can cut the packaging bag and heat-seal it. Figure 6 As shown, the shaft drive structure includes a combined end 7 and a mating end 8. The combined end 7 is fixedly disposed at the end position of the upper half pressure column 4, and the mating end 8 is fixedly disposed at the end position of the lower half pressure column 5. like Figure 8 As shown, both the combined end 7 and the mating end 8 have semi-circular grooves 701 on their surfaces, such as... Figure 6 As shown, both the upper pull-out assembly 2 and the lower pull-out assembly 3 are fixedly provided with semi-circular retaining ridges 702. Both the semi-circular groove 701 and the semi-circular retaining ridge 702 are semi-circular and fit together in a limiting manner; Figure 6 As shown, a positioning blind hole 707 is provided on the combined end 7, and a positioning shaft 801 is fixedly provided on the mating end 8. When the upper half-pressing column 4 and the lower half-pressing column 5 approach each other, the positioning blind hole 707 and the positioning shaft 801 can be inserted and matched to achieve a precise positioning effect. This allows the complete annular groove formed by the semi-arc groove 701 on the combined end 7 and the semi-arc groove 701 on the mating end 8 to rotate and match with the semi-arc retaining edge 702 on the upper pull-out assembly 2 and the semi-arc retaining edge 702 on the lower pull-out assembly 3.

[0034] Both the combined end 7 and the mating end 8 are fixedly provided with driving sleeves 703. When the upper half-pressure column 4 and the lower half-pressure column 5 clamp the packaging bag, the driving sleeves 703 corresponding to the combined end 7 and the mating end 8 are in a coaxial position. The lower pull-out assembly 3 is equipped with a driving shaft 704. The driving shaft 704 can rotate and move axially. When the upper half-pressure column 4 and the lower half-pressure column 5 clamp the packaging bag, the driving shaft 704 first moves axially to insert into the driving sleeve 703, and then drives the upper half-pressure column 4 and the lower half-pressure column 5 to rotate along the same axis by rotation. The cross section of the driving shaft 704 is polygonal, and the corresponding driving sleeve 703 is provided with polygonal holes, so that after the driving shaft 704 is inserted into the driving sleeve 703, it can drive it to rotate.

[0035] Rubber anti-slip pads are embedded on the facing surfaces of the upper half-pressure column 4 and the lower half-pressure column 5. The packaging bag is clamped by the elastic deformation of the rubber anti-slip pads, so that the upper half-pressure column 4 and the lower half-pressure column 5 can be in rigid contact. The thickness of the packaging bag only affects the rubber anti-slip pads, causing them to deform. This ensures that the upper half-pressure column 4 and the lower half-pressure column 5 are accurately fixed after being clamped in place, without affecting the relative rotation of the semi-arc groove 701 and the semi-arc clamping edge 702.

[0036] The surfaces of the combined end 7 and the mating end 8 are each embedded with a first alignment magnet 705, and the upper pull-out assembly 2 and the lower pull-out assembly 3 are each embedded with a second alignment magnet 706; the first alignment magnet 705 and the second alignment magnet 706 are magnetically positioned so that the upper half-pressing column 4 and the lower half-pressing column 5 remain in a fixed position when separated.

[0037] A drive unit is provided on the lower pull-out assembly 3, which can control the rotation and axial movement of the drive shaft 704. For example... Figure 7 As shown, the drive unit includes a round shaft portion 301 and a piston unit 302. The round shaft portion 301 is coaxially and fixedly connected to the drive insertion shaft 704. The piston unit 302 is installed at the end position of the round shaft portion 301. The round shaft portion 301 can rotate relative to the piston unit 302. The piston unit 302 can drive the round shaft portion 301 to move axially. An axial drive cylinder 303 is provided outside the piston unit 302. The axial drive cylinder 303 and the piston unit 302 cooperate to form a cylinder structure to drive the round shaft portion 301 axially. A fixing bracket sleeve 304 is fixedly provided at the end of the axial drive cylinder 303. A side bracket plate 305 is fixedly provided on the fixing bracket sleeve 304. The side bracket plate 305 is fixedly installed on the lower pull-out assembly 3.

[0038] A limiting groove 306 is provided on the round shaft portion 301, and a gear disk unit 9 is sleeved on the outside of the round shaft portion 301. The gear disk unit 9 can drive the round shaft portion 301 to rotate by cooperating with the limiting groove 306, and at the same time, the gear disk unit 9 can move axially relative to the round shaft portion 301. A servo motor 307 is fixedly installed on the lower pull-out assembly 3. The servo motor 307 is provided with a drive tooth 308, which meshes with the gear unit 9 and drives the gear unit 9 to rotate.

[0039] The inner side of the gear unit 9 is provided with a split inner disk 901. The split inner disk 901 and the gear unit 9 can rotate relative to each other. A connecting spring 902 is provided between the split inner disk 901 and the gear unit 9. The gear unit 9 applies a rotational driving force to the split inner disk 901 through the connecting spring 902.

[0040] A fixing plate 903 is fixedly installed on the gear unit 9. A positioning double shaft 904 is fixedly installed on the fixing plate 903. A triangular top tongue 905 is installed outside the positioning double shaft 904. A top tongue piston 906 is fixedly installed on the triangular top tongue 905. An integrated cylinder 907 is installed on the split inner plate 901. The top tongue piston 906 is located inside the integrated cylinder 907. A tension spring 908 is installed below the top tongue piston 906. The tension spring 908 applies tension to the top tongue piston 906. An inner disc air passage 909 is provided in the inner disc 901, and a frame air passage 910 is provided in the fixed frame 304. The frame air passage 910 and the inner disc air passage 909 can maintain gas communication during the rotation of the inner disc 901 relative to the fixed frame 304. When compressed gas is input into the frame air passage 910, the compressed gas will enter the integrated cylinder 907 to drive the triangular jack tongue 905 to extend, thereby returning and fixing the position between the inner disc 901 and the gear unit 9.

[0041] An impact toothed ring 911 is formed on the surface of the inner disc 901. An impact pry plate 912 is rotatably mounted on the side frame plate 305. A boss plate 913 is fixedly mounted on the side frame plate 305. A return spring 914 is provided between the boss plate 913 and the impact pry plate 912. The supporting elastic force of the return spring 914 prevents the impact pry plate 912 and the impact toothed ring 911 from contacting each other. Figure 10 As shown, when the impact gear ring 911 is formed on the surface of the inner disk 901 facing the fixed plate 903, the impact skid 912 is positioned by a servo during operation to avoid the location of the fixed plate 903. When the design area of ​​the gear unit 9 and the inner disk 901 is large enough, the impact gear ring 911 can also be formed on the surface of the inner disk 901 away from the fixed plate 903, so that the fixed plate 903 does not affect the operation of the impact skid 912 at all.

[0042] An impactor 915 is fixedly installed on the side frame plate 305. The impactor 915 can apply an impact force to the impact pry plate 912, thereby causing the impact pry plate 912 to rotate. It also cooperates with the impact tooth ring 911 to apply a rotational impact force to the inner plate 901 of the split. The impactor 915 can control the extension and retraction impact action of the shaft on it. This can be achieved by using an electromagnet in conjunction with a spring, which will not be described in detail in this invention.

[0043] In use, the packaging bag is placed on the surface of the packaged item and placed on the packaging conveyor 1. Three sides of the packaging bag are pre-heat-sealed, and the fourth side is open and placed between the upper pull-out assembly 2 and the lower pull-out assembly 3.

[0044] The downward pressure baffle 102 is controlled to move downward, limiting the upper part of the packaged item. Initially, as shown... Figure 6 As shown, the upper pressure column 4 and the lower pressure column 5 are in a separated state, with the packaging bag positioned between them. Controlling the upper pull-out assembly 2 to move downwards and the lower pull-out assembly 3 to move upwards causes the upper pressure column 4 and the lower pressure column 5 to clamp the packaging bag. After the upper pressure column 4 and the lower pressure column 5 are closed in place, their state is as shown... Figure 9 As shown in the image.

[0045] At this time, the drive shaft 704 is moved to the right, so that the drive shaft 704 is inserted into the two sets of drive sleeves 703 in sequence. Then, the drive shaft 704 is rotated. The drive shaft 704 drives the upper half pressure column 4 and the lower half pressure column 5 to rotate through the drive sleeves 703. During the rotation of the upper half pressure column 4 and the lower half pressure column 5, the semi-arc grooves 701 and the semi-arc locking edges 702 at the upper and lower positions cooperate to form a complete ring structure, which does not affect its rotation.

[0046] By rotating the upper half-pressure column 4 and the lower half-pressure column 5, the end of the packaging bag is wrapped around the cylindrical structure formed by the upper half-pressure column 4 and the lower half-pressure column 5, and gradually tightens with continuous rotation. The packaging bag has elasticity and can be elastically stretched and wrapped around the surface of the packaged item under the pulling force.

[0047] After being pulled into place, the heat-sealing cutter 6 is controlled to close and move, and the sealing of the fourth side is completed by heat cutting through the heat-sealing cutter 6.

[0048] Then, the drive shaft 704 reverses, loosening the packaging bag scraps wrapped around the upper and lower pressure columns 4 and 5, preventing the packaging bag scraps wrapped around the upper and lower pressure columns 4 and 5 from affecting their separation and movement. Through precise servo control of the drive shaft 704, when the drive shaft 704 stops reversing, the upper and lower pressure columns 4 and 5 return to their initial positions. Finally, the upper pull-out assembly 2 and the lower pull-out assembly 3 are separated, and the packaging bag scraps are removed by a robotic arm or manually.

[0049] With the upper pull-out assembly 2 and the lower pull-out assembly 3 separated, the upper half-pressing column 4 and the lower half-pressing column 5 remain in stable position due to the magnetic attraction between the second alignment magnet 706 and the first alignment magnet 705, thus preventing them from rotating due to vibration.

[0050] For the rotation and extension control of the drive shaft 704, such as Figure 9 As shown, the gear unit 9 is driven to rotate by the servo motor 307 and the drive pinion 308. The gear unit 9, through its engagement with the limiting slide groove 306, drives the round shaft 301 to rotate, and the round shaft 301 in turn drives the drive insert shaft 704 to rotate. Figure 7 As shown, the left end of the axial drive cylinder 303 is connected to compressed gas. When compressed gas is filled into the axial drive cylinder 303, the compressed gas drives the piston unit 302 to move to the right, which in turn drives the round shaft part 301 to move to the right. Thus, the axial movement of the drive shaft 704 can be controlled by positive and negative pressure.

[0051] like Figure 2As shown, when the triangular tongue 905 extends, the triangular tongue 905 is locked between the two positioning shafts 904 by the inclined surfaces on both sides, so that the gear plate unit 9 and the inner disk 901 of the split are fixed and cannot rotate relative to each other. The fixed position between the gear plate unit 9 and the inner disk 901 of the split remains unchanged, so as to ensure the precise rotational positioning of the drive shaft 704 by the servo motor 307.

[0052] During the process of pulling the packaging bag, when the packaging bag is pulled and tightened to a certain extent, the triangular tongue 905 is controlled to retract. After the triangular tongue 905 retracts, an action gap is generated between the triangular tongue 905 and the positioning dual shaft 904. At this time, the gear plate unit 9 and the inner plate 901 can rotate relative to each other within the above gap range. At this time, the gear plate unit 9 drives the inner plate 901 to keep rotating slowly through the support of the connecting spring 902.

[0053] like Figure 12 As shown, the impactor 915 applies an impact force to the end of the impact pry bar 912. The other end of the impact pry bar 912 rotates along an arc, causing it to swing to the left. This allows the other end of the impact pry bar 912 to engage with the impact tooth ring 911, causing the impact force of the impactor 915 to act on the inner disc 901 of the split body. Then, through the limiting slide groove 306 and the round shaft part 301, it acts on the drive shaft 704. Finally, the upper half pressure column 4 and the lower half pressure column 5 apply a pulse-like impact wave to the pulling force on the packaging bag. Smooth pulling requires overcoming a larger maximum static friction force, which can easily cause excessive stretching of the packaging bag. Vibration pulling, on the other hand, is a constant pulling force superimposed with periodic vibration force. The peak pulling force can instantly break through the static friction threshold, turning the interface into dynamic friction with less resistance, thus reducing excessive stretching of the packaging bag in some areas.

[0054] The extension and retraction control of the aforementioned triangular tongue 905 is achieved by applying compressed gas to the pneumatic passage 910 of the frame, such as... Figure 7 As shown, when the mechanism of the present invention is working, the frame air passage 910 is connected to the external air control equipment. When compressed gas is input through the frame air passage 910, it will enter the integrated cylinder 907 through the inner plate air passage 909, causing the top tongue piston 906 and the triangular top tongue 905 to extend. Conversely, after the exhaust is discharged from the end of the frame air passage 910, the triangular top tongue 905 will retract under the elastic tension of the tension spring 908.

[0055] After the pull-out is completed, before the drive shaft 704 reverses to loosen the scraps of the packaging bag, the triangular top tongue 905 is first controlled to extend into place, so that the position between the toothed disc unit 9 and the inner disc 901 is fixed and accurately returned to its original position, which facilitates the precise rotation and positioning of the drive shaft 704 by the servo motor 307.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A side-pull-out mechanism for a four-side sealing packaging machine, comprising a packaging conveyor table and an upper pull-out assembly and a lower pull-out assembly that are vertically movable and disposed on the side of the packaging conveyor table, characterized in that: The upper and lower pull-out components are positioned vertically opposite each other. The upper pull-out component has an upper half-pressure column inside, and the lower pull-out component has a lower half-pressure column inside. One end of the packaging bag extends between the upper and lower pull-out components. When the upper and lower pull-out components come close to each other, the upper and lower half-pressure columns can clamp the end of the packaging bag. The ends of the upper and lower half-pressure columns are provided with a shaft drive structure. When the upper and lower half-pressure columns clamp the packaging bag, the shaft drive structure can drive the upper and lower half-pressure columns to rotate along the same axis. The upper and lower pull-out components are respectively equipped with heat-sealing cutting strips that can be raised and lowered. The heat-sealing cutting strips can cut the packaging bag and heat-seal it. The combined shaft drive structure includes a combined end and a mating end. The combined end is fixedly disposed at the end position of the upper half pressure column, and the mating end is fixedly disposed at the end position of the lower half pressure column. Both the combined end and the mating end have semi-circular grooves on their surfaces. Both the upper and lower pull-out components have semi-circular retaining edges fixedly installed on them. The semi-circular grooves and retaining edges are semi-circular and fit together in a limiting manner. Both the combined end and the mating end have driving sleeves fixedly installed on their surfaces. When the upper and lower pressure columns clamp the packaging bag, the driving sleeves corresponding to the combined end and the mating end are in a coaxial position. The lower pull-out assembly is equipped with a drive shaft, which is capable of rotation and axial movement. When the upper and lower pressure columns clamp the packaging bag, the drive shaft first moves axially to insert into the drive sleeve, and then drives the upper and lower pressure columns to rotate along the same axis by rotation. The lower pull-out assembly is equipped with a drive unit, which can control the rotation and axial movement of the drive shaft. The drive unit includes a round shaft and a piston unit. The round shaft is coaxially and fixedly connected to the drive shaft. The piston unit is installed at the end of the round shaft. The round shaft can rotate relative to the piston unit. The piston unit can drive the round shaft to move axially. An axial drive cylinder is provided on the outside of the piston unit. The axial drive cylinder and the piston unit cooperate to form a cylinder structure to drive the round shaft part axially. A fixed frame sleeve is fixedly provided at the end of the axial drive cylinder, and a side frame plate is fixedly provided on the fixed frame sleeve. The side frame plate is fixedly installed on the lower pull-out assembly. A limit slide groove is provided on the round shaft part, and a gear disk unit is sleeved on the outside of the round shaft part. The gear disk unit can drive the round shaft part to rotate by cooperating with the limit slide groove, and at the same time, the gear disk unit can move axially relative to the round shaft part. A servo motor is fixedly installed on the lower pull-out assembly. The servo motor is equipped with drive teeth, which mesh with the gear disk unit to drive the gear disk unit to rotate.

2. The side pull-out mechanism of a four-side sealing packaging machine according to claim 1, characterized in that: The surfaces of the combined end and the mating end are each embedded with a first alignment magnet, and the upper pull-out assembly and the lower pull-out assembly are each embedded with a second alignment magnet; the first alignment magnet and the second alignment magnet are magnetically attracted and positioned so that the upper half-pressing column and the lower half-pressing column remain in a fixed position when separated.

3. The side pull-out mechanism of a four-side sealing packaging machine according to claim 1, characterized in that: The inner side of the toothed disc unit is provided with a split inner disc, which can rotate relative to the toothed disc unit. A connecting spring is provided between the split inner disc and the toothed disc unit, and the toothed disc unit applies a rotational driving force to the split inner disc through the connecting spring.

4. The side pull-out mechanism of a four-side sealing packaging machine according to claim 3, characterized in that: A fixing plate is fixedly installed on the gear plate unit, and a positioning double shaft is fixedly installed on the fixing plate. A triangular tongue is provided on the outside of the positioning double shaft, and a tongue piston is fixedly installed on the triangular tongue. An integrated cylinder is provided on the split inner plate, and the tongue piston is located inside the integrated cylinder. A tension spring is provided below the tongue piston, and the tension spring applies tension to the tongue piston. The inner plate of the split body is provided with an inner plate air passage, and the fixed frame is provided with a frame air passage. The frame air passage and the inner plate air passage can maintain gas communication during the rotation of the inner plate of the split body relative to the fixed frame. When compressed gas is input into the air circuit of the frame, the compressed gas enters the integrated cylinder and drives the triangular jack tongue to extend, thereby repositioning and fixing the positions of the inner disc and the gear disc unit.

5. The side pull-out mechanism of a four-side sealing packaging machine according to claim 4, characterized in that: An impact toothed ring is provided on the surface of the inner disc of the split, an impact pry plate is rotatably mounted on the side frame plate, a boss plate is fixedly provided on the side frame plate, and a return spring is provided between the boss plate and the impact pry plate. The supporting elastic force of the return spring prevents the impact pry plate and the impact toothed ring from contacting each other. An impactor is fixedly installed on the side frame plate. The impactor can apply impact force to the impact pry bar, thereby causing the impact pry bar to rotate. It also cooperates with the impact tooth ring to apply rotational impact force to the inner plate of the split.

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