Plastic bag sealing machine for food packaging

Abstract

The invention relates to the technical field of packaging equipment, in particular to a food packaging plastic bag sealing machine which comprises two sets of oppositely-arranged extrusion units, and the two extrusion units conduct extrusion sealing treatment on a plastic bag in a horizontal conveying state between the two extrusion units; the extrusion unit comprises two main wheels on the same horizontal plane, the main wheels are hollow, the outer side of each main wheel is coaxially sleeved with a rotating ring, the two rotating rings are in transmission connection through an extrusion belt, the extrusion belt is used for making contact with a plastic bag, a plurality of openings are formed in the outer walls of the circumferences of the main wheels, and rotating columns are rotationally arranged in the openings. The inner side of the packaging bag is directly heated and melted in a friction heat generation mode, the process of transferring heat from the outer side of the packaging bag to the inner side of the packaging bag is reduced, deformation of the outer side of the packaging bag is avoided, energy loss is reduced, the sealing speed is increased, the working efficiency is improved, and the sealing quality and attractiveness are improved.

Description

Technical Field

[0001] The invention relates to the technical field of packaging equipment, in particular to a plastic bag sealing machine for food packaging. Background Art

[0002] With the rapid development of the food industry and the increasing requirements of consumers for food safety and hygiene standards, food packaging technology has received unprecedented attention and development. Food packaging not only needs to ensure the appearance of the product, but more importantly, it needs to ensure the freshness and safety of food during transportation and storage. Plastic bags, as a common food packaging material, are widely used in the food industry because of their low cost, ease of use, and good sealing performance.

[0003] At present, the commonly used plastic bag sealing machines on the market mainly use heat sealing to seal the packaging bags. The bag opening of the packaging bag is placed on a heating strip or a heating belt to heat and melt it, so that the bag openings are adhered to each other, thereby achieving the purpose of sealing. However, this sealing method heats from the outside, that is, the outside of the bag opening will melt first, and then the inside of the bag opening can be melted, and then the bag opening is adhered and sealed. This causes the outside of the bag opening to be heated higher than the inside, and the deformation of the outside is too large. At the same time, since the inside cannot be heated directly, it will consume a lot of excess heat, resulting in energy waste. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a plastic bag sealing machine for food packaging, and the specific technical solution adopted is: According to a first aspect of the present invention, there is provided a plastic bag sealing machine for food packaging, comprising two sets of extrusion units arranged opposite to each other, the two extrusion units performing extrusion sealing processing on the plastic bags in a horizontal conveying state between them; The extrusion unit comprises two main wheels on the same horizontal plane, the main wheels are hollow inside, a rotating ring is coaxially sleeved on the outside of each main wheel, the two rotating rings are connected by an extrusion belt transmission, the extrusion belt is used to contact the plastic bag, a plurality of openings are opened on the circumferential outer wall of the main wheel, a rotating column is rotatably arranged in the opening, and the axis of the rotating column is parallel to the axis of the main wheel, a plug plate is slidably inserted on the rotating column, the sliding direction of the plug plate is along the radial direction of the rotating column, one end of the plug plate is located on the inner side of the main wheel, and the other end of the plug plate is rotatably connected to the circumferential inner wall of the rotating ring; Among them, a swing unit is arranged in the main wheel. When the main wheel conveys the extrusion belt through the rotating ring, the swing unit pushes the rotating ring to reciprocate on the main wheel, and there is a difference in the timing of the reciprocating motion of the two extrusion belts.

[0005] Further, a plurality of arc grooves are formed in the end face wall inside the main wheel, and a sliding column is slidably arranged in each arc groove. The sliding column is fixedly connected with the inserting plate inside the main wheel. Wherein, the axis of the sliding column is parallel to the axis of the main wheel. When the rotating ring rotates on the main wheel, the sliding column slides in the arc groove.

[0006] Further, the swinging unit includes an adjusting column coaxial with the main wheel and a plurality of fork-shaped members installed on the outer wall of the adjusting column. The adjusting column and the fork-shaped members are both located inside the main wheel, and the fork-shaped members are clamped on the outer wall of the sliding column.

[0007] Further, a main shaft is fixed on the outer end face of the main wheel. The adjusting column passes through the main wheel and the main shaft and extends out. The adjusting column is rotationally connected with the main wheel and the main shaft. Threads are arranged on the outer wall of the adjusting column outside the main shaft. A threaded sleeve is screwed on the threads of the adjusting column. A plurality of inserting rods are fixed on the end face of the threaded sleeve, and the inserting rods slide and insert into the main shaft along the axis direction of the adjusting column. Wherein, a vibration structure is arranged on the main shaft, and the vibration structure is used to drive the threaded sleeve to reciprocate on the adjusting column.

[0008] Further, the vibration structure includes a first transmission wheel sleeved on the outer wall of the main shaft. A second transmission wheel is drivingly arranged on the first transmission wheel. A dialing column is eccentrically arranged on the second transmission wheel. Two retaining rings are arranged on the outer wall of the threaded sleeve, and the dialing column is located between the two retaining rings.

[0009] Further, a sliding groove is formed in the second transmission wheel. The length direction of the sliding groove is along the radial direction of the second transmission wheel. A first sliding block is slidably arranged in the sliding groove. The dialing column is arranged on the first sliding block. When the first sliding block slides in the sliding groove, the rotation radius of the dialing column increases or decreases following the rotation of the second transmission wheel.

[0010] Further, a buckle groove plate is arranged on the second transmission wheel, and the second transmission wheel rotates on the buckle groove plate. An adjusting plate is horizontally arranged on the outer wall of the buckle groove plate. Side plates are arranged on the adjusting plate, and the adjusting plate horizontally slides through the side plates. The side plates support the adjusting plate, and the side plates and the adjusting plate are connected by a lock nut. A secondary wheel is rotatably arranged on the side plate. The secondary wheel is coaxial with the second transmission wheel. A second sliding block is slidably arranged on the secondary wheel, and the second sliding block slides along the radial direction of the secondary wheel. The second sliding block and the secondary wheel are connected by a lock nut. The dialing column slides through the first sliding block and is fixed on the second sliding block.

[0011] Further, the extrusion unit further includes a housing. The main wheel is rotatably installed on the housing. The main shaft passes through the housing and is rotationally connected. A motor is arranged on the housing. A worm is arranged at the output end of the motor. Two worm wheels are meshed with the worm. The two worm wheels are respectively installed on two main shafts of the extrusion unit. A support plate is arranged at the top of the housing, and the side plate is fixed on the support plate.

[0012] The beneficial effects of the present invention are as follows: By means of heat generation by friction, the present invention directly heats and melts the inner side of the packaging bag, reducing the process of heat transfer from the outer side to the inner side of the packaging bag, avoiding deformation of the outer side of the packaging bag, reducing energy loss, and improving the sealing speed, thereby improving work efficiency and the quality and aesthetics of the seal; the method of heat generation by friction has a fast heating rate and can quickly reach the melting temperature, shortening the sealing time and improving production efficiency; the two extrusion belts of the present invention perform the sealing operation while conveying the packaging bag, achieving a dynamic and continuous sealing effect, being applicable to high-speed production lines and improving the overall efficiency of the production line; through the reciprocating movement of the two extrusion belts, the two sides of the packaging bag are relatively rubbed and slid, enabling the inner wall to be evenly heated, avoiding problems of local overheating or uneven heating, and ensuring the uniformity and reliability of the seal; compared with traditional electric heating sealing machines, the structure of the present invention is simpler, reducing complex heating elements and control circuits, and lowering the manufacturing cost and maintenance difficulty of the equipment; in summary, the present invention provides a high-efficiency, energy-saving and reliable plastic bag sealing machine for food packaging, which can significantly improve the problems existing in traditional heat sealing methods, improve the sealing quality and production efficiency, and has high practical value and market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is Figure 1 a schematic structural diagram of the extrusion unit in Figure 3 is Figure 2 a schematic diagram of the internal structure in Figure 4 is Figure 3 a schematic structural diagram of the main shaft in Figure 5 is Figure 4 a schematic structural diagram of the main wheel in Figure 6 is Figure 4 a schematic diagram of the sectional view and upward view of the main wheel in Figure 7 is Figure 4 a schematic structural diagram of the first transmission wheel in

[0015] Reference numerals: 1. Extrusion unit; 2. Main wheel; 3. Swivel ring; 4. Extrusion belt; 5. Opening; 6. Rotating column; 7. Insert plate; 8. Arc groove; 9. Slide column; 10. Adjusting column; 11. Fork; 12. Main shaft; 13. Threaded sleeve; 14. Insert rod; 15. First transmission wheel; 16. Second transmission wheel; 17. Poking column; 18. Retaining ring; 19. First slider; 20. Side plate; 21. Adjusting plate; 22. Buckle groove plate; 23. Auxiliary wheel; 24. Second slider; 25. Outer shell; 26. Motor; 27. Worm; 28. Worm gear; 29. Support plate. Detailed implementation manners

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0017] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0018] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. This embodiment is written in a progressive manner.

[0019] As Figures 1 to 7 shown, a plastic bag sealing machine for food packaging of the present invention includes two sets of extrusion units 1 arranged oppositely, and the two extrusion units 1 perform extrusion sealing treatment on the plastic bag in a horizontal conveying state therebetween; The extrusion unit 1 includes two main wheels 2 on the same horizontal plane, the main wheels 2 are hollow inside, and a swivel 3 is coaxially sleeved on the outer side of each main wheel 2. The two swivels 3 are connected by a squeezing belt 4, and the squeezing belt 4 is used to contact the plastic bag. A plurality of openings 5 ​​are provided on the circumferential outer wall of the main wheel 2, and a rotating column 6 is rotatably arranged in the opening 5, and the axis of the rotating column 6 is parallel to the axis of the main wheel 2. A plug plate 7 is slidably inserted on the rotating column 6, and the sliding direction of the plug plate 7 is along the radial direction of the rotating column 6. One end of the plug plate 7 is located on the inner side of the main wheel 2, and the other end of the plug plate 7 is rotatably connected to the circumferential inner wall of the swivel 3; Among them, a swing unit is arranged in the main wheel 2. When the main wheel 2 conveys the extrusion belt 4 through the rotating ring 3, the swing unit pushes the rotating ring 3 to reciprocate on the main wheel 2. There is a difference in the timing of the reciprocating motion of the two extrusion belts 4.

[0020] In detail, the two groups of extrusion units 1 are distributed on the left and right, and the gap between them is used to provide a passing space for the bag opening position of the packaging bag on the external conveyor belt. The two groups of extrusion units 1 perform extrusion and sealing processing on the bag opening position between them. The main wheel 2 and the swivel 3 remain coaxial, and the main wheel 2 supports the swivel 3 through multiple plug plates 7. When the main wheel 2, the swivel 3 and the extrusion belt 4 move synchronously, the movement directions of the two extrusion belts 4 on the two groups of extrusion units 1 are opposite, that is, the two extrusion belts 4 can squeeze the packaging bag between them and convey it horizontally at the same time. Since the swing unit will push the plug plate 7 to swing on the rotating column 6, the plug plate 7 will push the swivel 3 to perform a small range of reciprocating rotation on the main wheel 2, that is, the swivel 3 follows the main wheel 2 in a circular motion. While moving, it repeats a small range of reciprocating rotation, and the swivel ring 3 transmits this movement state to the extrusion belt 4, thereby making the extrusion belt 4 advance a certain distance and then retreat a certain distance, and the retreat distance will be smaller than the forward distance. On the whole, the extrusion belt 4 performs periodic reciprocating motion while performing circular transmission. Since there is a difference in the timing of the reciprocating motion of the two extrusion belts 4, the two extrusion belts 4 can synchronously convey the packaging bag to move horizontally while the two extrusion belts 4 use their friction to make the two sides of the packaging bag relatively rub and slide, so that the inner wall of the packaging bag rubs itself and generates heat. The heat can be used to melt the inner side of the packaging bag and stick to each other, thereby achieving the working effect of directly heating and heat-sealing the inner wall of the packaging bag.

[0021] It should be noted that since this method generates heat by friction, there is no need to equip it with an electric heating structure, which greatly reduces energy loss and cost investment. At the same time, compared with the heat transfer method of electric heating, the heating speed of this sealing method is faster and the sealing efficiency is higher. Since the two extrusion belts 4 continuously convey the packaging bag, a dynamic and continuous sealing effect can be achieved. Since the rotating ring 3 can move relative to the main wheel 2, the rotating ring 3 will pull the plug board 7 to slide relative to the rotating column 6, and the rotating column 6 can rotate within the opening 5.

[0022] The present invention directly heats and melts the inner side of the packaging bag by generating heat through friction, reducing the process of heat transfer from the outer side to the inner side of the packaging bag, avoiding deformation of the outer side of the packaging bag, reducing energy loss, and improving the sealing speed, thereby improving work efficiency, the sealing quality and aesthetics; the method of generating heat through friction has a fast heating speed, can quickly reach the melting temperature, shortens the sealing time, and improves production efficiency; the two extrusion belts 4 of the present invention perform a sealing operation while conveying the packaging bag, achieving a dynamic and continuous sealing effect, being applicable to high-speed production lines, and improving the overall efficiency of the production line; through the reciprocating movement of the two extrusion belts 4, the two sides of the packaging bag perform relative rubbing and sliding, enabling the inner side wall to be evenly heated, avoiding problems of local overheating or uneven heating, and ensuring the uniformity and reliability of the seal; compared with traditional electric heating sealing machines, the structure of the present invention is simpler, reducing complex heating elements and control circuits, and lowering the manufacturing cost and maintenance difficulty of the equipment; in summary, the present invention provides a high-efficiency, energy-saving and reliable plastic bag sealing machine for food packaging, which can significantly improve the problems existing in traditional heat sealing methods, improve the sealing quality and production efficiency, and has high practical value and market prospects.

[0023] Furthermore, a plurality of arc-shaped grooves 8 are formed in the end face wall inside the main wheel 2, and a sliding column 9 is slidably disposed in each arc-shaped groove 8. The sliding column 9 is fixedly connected to the plug board 7 inside the main wheel 2. Among them, the axis of the sliding column 9 is parallel to the axis of the main wheel 2. When the rotating ring 3 rotates on the main wheel 2, the sliding column 9 slides in the arc-shaped groove 8.

[0024] Specifically, since the rotating ring 3 is only connected to the main wheel 2 through a plurality of plug boards 7 and a plurality of rotating columns 6, there is a phenomenon that the rotating ring 3 and the main wheel 2 cannot be coaxial. To ensure that the rotating ring 3 and the main wheel 2 are always coaxial, it is necessary to use the arc-shaped groove 8 and the sliding column 9 to guide the plug board 7, that is, when the rotating ring 3 makes a small-range reciprocating rotation on the axis of the main wheel 2, the rotating ring 3 will drive the sliding column 9 to slide in the arc-shaped groove 8 through the plug board 7.

[0025] Further, the swinging unit includes an adjusting column 10 coaxial with the main wheel 2 and a plurality of fork levers 11 mounted on the outer wall of the adjusting column 10. The adjusting column 10 and the fork levers 11 are both located inside the main wheel 2, and the fork levers 11 are clamped on the outer wall of the sliding column 9.

[0026] Specifically, when the adjusting column 10 reciprocally rotates, it will drive the sliding column 9 to slide in the arc-shaped groove 8 through the fork levers 11. At this time, the sliding column 9 will drive the insertion plate 7 to rotate, and the insertion plate 7 will push the rotating ring 3 to rotate relative to the main wheel 2, thereby achieving the effect of the reciprocating rotation of the rotating ring 3 within a small range.

[0027] Further, a main shaft 12 is fixed on the outer end surface of the main wheel 2. The adjusting column 10 passes through the main wheel 2 and the main shaft 12 and extends out. The adjusting column 10 is rotationally connected to the main wheel 2 and the main shaft 12. Threads are provided on the outer wall of the adjusting column 10 outside the main shaft 12. A threaded sleeve 13 is screwed on the threads of the adjusting column 10. A plurality of insertion rods 14 are fixed on the end surface of the threaded sleeve 13, and the insertion rods 14 slide and insert into the main shaft 12 along the axial direction of the adjusting column 10; Wherein, a vibration structure is provided on the main shaft 12, and the vibration structure is used to drive the threaded sleeve 13 to reciprocate on the adjusting column 10.

[0028] Specifically, when the main shaft 12 rotates, it will drive the main wheel 2 to rotate. The main shaft 12 will synchronously drive the threaded sleeve 13 to rotate by means of the insertion rods 14. When the threaded sleeve 13 and the main shaft 12 are relatively stationary, since the adjusting column 10 is threadedly connected to the threaded sleeve 13, and the adjusting column 10 is rotatably installed on the main wheel 2, the threaded sleeve 13 will drive the adjusting column 10 to rotate synchronously. At this time, the adjusting column 10 and the main shaft 12 are relatively stationary and rotate synchronously. When the vibration structure pushes the threaded sleeve 13 to reciprocate up and down on the adjusting column 10, since the adjusting column 10 and the threaded sleeve 13 are threadedly connected, the threaded sleeve 13 will push the adjusting column 10 to perform a small-range reciprocating rotation. At this time, the adjusting column 10 rotates reciprocally relative to the main wheel 2. Thus, the adjusting column 10 will push the sliding column 9 to reciprocate in the arc-shaped groove 8 through the fork levers 11, achieving the working effect that the rotating ring 3 performs a small-range reciprocating rotation while following the synchronous circular motion of the main wheel 2. When the threaded sleeve 13 moves up and down, it will drive the insertion rods 14 to slide on the main shaft 12.

[0029] Further, the vibration structure includes a first transmission wheel 15 sleeved on the outer wall of the main shaft 12. A second transmission wheel 16 is drivingly arranged on the first transmission wheel 15. An eccentrically arranged push rod 17 is provided on the second transmission wheel 16. Two retaining rings 18 are provided on the outer wall of the threaded sleeve 13, and the push rod 17 is located between the two retaining rings 18.

[0030] In detail, the first transmission wheel 15 is coaxial with the main shaft 12, and the axis of the second transmission wheel 16 is perpendicular to the axis of the main shaft 12. The first transmission wheel 15 and the second transmission wheel 16 are driven by friction. When the main shaft 12 rotates, it will drive the first transmission wheel 15 and the second transmission wheel 16 to rotate, and the second transmission wheel 16 will drive the shifting post 17 to rotate eccentrically. In the vertical direction, the shifting post 17 will use two retaining rings 18 to push the threaded sleeve 13 up and down. In the horizontal direction, the shifting post 17 will slide relative to the retaining ring 18, thereby using the rotational power of the main shaft 12 to provide power for the vibration of the threaded sleeve 13.

[0031] Furthermore, a slide groove is provided on the second transmission wheel 16, and the length direction of the slide groove is along the radial direction of the second transmission wheel 16. A first slider 19 is slidably arranged in the slide groove, and a lever 17 is arranged on the first slider 19. When the first slider 19 slides in the slide groove, the lever 17 increases or decreases with the rotation radius of the second transmission wheel 16.

[0032] In detail, when adjusting the distance between the first slider 19 and the axis of the second transmission wheel 16, the distance between the lever 17 and the axis of the second transmission wheel 16 can be adjusted synchronously, thereby facilitating the adjustment of the rotation radius of the lever 17. By using this adjustment method, the vibration amplitude of the threaded sleeve 13 in the vertical direction can be adjusted, thereby adjusting the amplitude of the small-range reciprocating rotation of the swivel 3 on the main wheel 2.

[0033] It should be noted that when the lever 17 is adjusting the turning radius, the lever 17 cannot be separated from the retaining ring 18 .

[0034] Further, the second transmission wheel 16 is provided with a buckle groove plate 22, and the second transmission wheel 16 rotates on the buckle groove plate 22, an adjustment plate 21 is horizontally provided on the outer wall of the buckle groove plate 22, a side plate 20 is provided on the adjustment plate 21, and the adjustment plate 21 slides horizontally through the side plate 20, the side plate 20 supports the adjustment plate 21, and the side plate 20 and the adjustment plate 21 are connected by a lock nut; A secondary wheel 23 is rotatably provided on the side plate 20, and the secondary wheel 23 is coaxial with the second transmission wheel 16. A second slider 24 is slidably provided on the secondary wheel 23, and the second slider 24 slides along the radial direction of the secondary wheel 23. The second slider 24 is connected to the secondary wheel 23 through a lock nut, and the shifting column 17 slides through the first slider 19 and is fixed on the second slider 24.

[0035] Specifically, the side plate 20 can support the auxiliary wheel 23 and the adjusting plate 21. Since the auxiliary wheel 23 is coaxial with the second transmission wheel 16, when the second transmission wheel 16 rotates, it will drive the auxiliary wheel 23 to rotate through the first slider 19, the dial post 17 and the second slider 24. When it is necessary to adjust the turning radius of the dial post 17, only need to loosen the lock nut on the second slider 24 and then slide the second slider 24 to adjust the position of the second slider 24 on the auxiliary wheel 23. The second slider 24 adjusts the position of the first slider 19 on the second transmission wheel 16 through the dial post 17.

[0036] When it is necessary to adjust the transmission ratio between the first transmission wheel 15 and the second transmission wheel 16, only need to loosen the lock nut between the side plate 20 and the adjusting plate 21 and then slide the adjusting plate 21 to move the second transmission wheel 16 through the dial post 17. In this way, the frequency of the reciprocating motion of the threaded sleeve 13 can be adjusted, so as to adjust the frequency of the relative motion of the rotating ring 3 to the main wheel 2.

[0037] Furthermore, the extrusion unit 1 further includes a housing 25. The main wheel 2 is rotatably installed on the housing 25. The main shaft 12 passes through the housing 25 and is rotatably connected. A motor 26 is provided on the housing 25. A worm 27 is provided at the output end of the motor 26. Two worm wheels 28 are engaged with the worm 27. The two worm wheels 28 are respectively installed on the two main shafts 12 of the extrusion unit 1. A support plate 29 is provided at the top of the housing 25. The side plate 20 is fixed on the support plate 29.

[0038] Specifically, the housing 25 plays a supporting role. The motor 26 can drive the two main shafts 12 to rotate synchronously through the worm 27 and the worm wheels 28. The support plate 29 can support the side plate 20.

[0039] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can still be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A plastic bag sealing machine for food packaging, characterized in that: It includes two sets of extrusion units arranged opposite to each other, and the two extrusion units perform extrusion sealing processing on the plastic bags in the horizontal conveying state between them; The extrusion unit comprises two main wheels on the same horizontal plane, the main wheels are hollow inside, a rotating ring is coaxially sleeved on the outside of each main wheel, the two rotating rings are connected by an extrusion belt transmission, the extrusion belt is used to contact the plastic bag, a plurality of openings are opened on the circumferential outer wall of the main wheel, a rotating column is rotatably arranged in the opening, and the axis of the rotating column is parallel to the axis of the main wheel, a plug plate is slidably inserted on the rotating column, the sliding direction of the plug plate is along the radial direction of the rotating column, one end of the plug plate is located on the inner side of the main wheel, and the other end of the plug plate is rotatably connected to the circumferential inner wall of the rotating ring; Among them, a swing unit is arranged in the main wheel. When the main wheel conveys the extrusion belt through the rotating ring, the swing unit pushes the rotating ring to reciprocate on the main wheel, and there is a difference in the timing of the reciprocating motion of the two extrusion belts.

2. A plastic bag sealing machine for food packaging according to claim 1, characterized in that: A plurality of arc-shaped grooves are provided on the inner end wall of the main wheel, and a sliding column is slidably arranged in each arc-shaped groove, and the sliding column is fixedly connected to the plug plate on the inner side of the main wheel; The axis of the sliding column is parallel to the axis of the main wheel. When the swivel rotates on the main wheel, the sliding column slides in the arc groove.

3. A plastic bag sealing machine for food packaging according to claim 2, characterized in that: The swing unit comprises an adjusting column coaxial with the main wheel and a plurality of shift forks mounted on the outer wall of the adjusting column. The adjusting column and the shift forks are both located on the inner side of the main wheel, and the shift forks are clamped on the outer wall of the sliding column.

4. A plastic bag sealing machine for food packaging according to claim 3, characterized in that: A main shaft is fixed on the outer end surface of the main wheel, the adjusting column passes through the main wheel and the main shaft and extends out, the adjusting column is rotatably connected with the main wheel and the main shaft, a thread is arranged on the outer wall of the adjusting column outside the main shaft, a thread sleeve is screwed on the thread of the adjusting column, a plurality of insert rods are fixed on the end surface of the thread sleeve, and the insert rods are inserted into the main shaft by sliding along the axis direction of the adjusting column; Wherein, a vibration structure is arranged on the main shaft, and the vibration structure is used to drive the threaded sleeve to reciprocate on the adjusting column.

5. A plastic bag sealing machine for food packaging according to claim 4, characterized in that: The vibration structure includes a first transmission wheel sleeved on the outer wall of the main shaft, a second transmission wheel is arranged on the first transmission wheel, a shifting post is eccentrically arranged on the second transmission wheel, two retaining rings are arranged on the outer wall of the threaded sleeve, and the shifting post is located between the two retaining rings.

6. A plastic bag sealing machine for food packaging according to claim 5, characterized in that: A sliding groove is provided on the second transmission wheel, and the length direction of the sliding groove is along the radial direction of the second transmission wheel. A first sliding block is slidably arranged in the sliding groove, and a shifting post is arranged on the first sliding block. When the first sliding block slides in the sliding groove, the shifting post increases or decreases with the rotation radius of the second transmission wheel.

7. A plastic bag sealing machine for food packaging according to claim 6, characterized in that: The second transmission wheel is provided with a buckle groove plate, and the second transmission wheel rotates on the buckle groove plate, an adjustment plate is horizontally provided on the outer wall of the buckle groove plate, a side plate is provided on the adjustment plate, and the adjustment plate slides horizontally through the side plate, the side plate supports the adjustment plate, and the side plate and the adjustment plate are connected by a lock nut; A secondary wheel is rotatably arranged on the side plate, the secondary wheel is coaxial with the second transmission wheel, a second slider is slidably arranged on the secondary wheel, and the second slider slides along the radial direction of the secondary wheel, the second slider is connected to the secondary wheel through a lock nut, and the shifting column slides through the first slider and is fixed on the second slider.

8. A plastic bag sealing machine for food packaging according to claim 7, characterized in that: The extrusion unit also includes an outer shell, a main wheel is rotatably mounted on the outer shell, a main shaft passes through the outer shell and is rotatably connected, a motor is arranged on the outer shell, a worm is arranged at the output end of the motor, two worm wheels are meshed on the worm, and the two worm wheels are respectively mounted on the two main shafts on the extrusion unit, a support plate is arranged on the top of the outer shell, and the side plate is fixed on the support plate.

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