A vacuum packaging machine

Abstract

The invention discloses a vacuum packaging machine, comprising a frame, a first conveyor belt, a second conveyor belt, and a sealing mechanism. The first conveyor belt and the second conveyor belt are installed in the frame according to a straight line. A sealing cover is arranged in the middle of the frame. A turning mechanism is arranged at the position where the first conveyor belt and the second conveyor belt are connected. The turning mechanism comprises a rotating frame, a motor, a fixed roller, a movable roller and a first cylinder. The rotating frame and the sealing cover are rotatably arranged. The invention places an open packaging bag filled with materials on the first conveyor belt, detects the relative position of the packaging bag by a sensor, clamps the open position of the packaging bag by the movable roller and the fixed roller, and turns the packaging bag by a certain angle, then presses the packaging bag by a sealing component to evacuate the packaging bag, and then performs a heat-sealing treatment on the packaging bag. In this way, continuous vacuum sealing processing of the packaging bag can be realized without manual operation.

Description

Technical Field

[0001] The invention discloses a vacuum packaging machine, belonging to the technical field of sealed storage equipment. Background Art

[0002] Vacuum packaging machines are common packaging equipment. The vacuum system of existing vacuum packaging machines is usually directly connected to the vacuum chamber through a vacuum pump and equipped with a time controller to set the vacuuming time and heat sealing time, so as to achieve the vacuuming and heat sealing effects. When vacuum sealing a packaging bag, most existing vacuum packaging equipment needs to fix the open mouth of the packaging bag on a workbench, then cover the surface of the packaging bag with a vacuuming device, first vacuumize the packaging bag, then heat seal it, and finally manually remove the packaging bag from the workbench. For example, the vacuum heat sealing device disclosed in announcement number CN114620267 can only process a single packaging bag in this way, and cannot achieve continuous automatic vacuum heat sealing. In the process of mass production, its efficiency is low. Summary of the invention

[0003] The purpose of the present invention is to solve the problems in the prior art and to provide a vacuum packaging machine.

[0004] The present invention achieves the above-mentioned purpose through the following technical scheme: a vacuum packaging machine comprises a frame, a first conveyor belt, a second conveyor belt, and a sealing mechanism, wherein the first conveyor belt and the second conveyor belt are installed in the frame in a straight line, a sealing cover is arranged in the middle of the frame, and a turning mechanism is arranged at the position where the first conveyor belt and the second conveyor belt meet, and the turning mechanism comprises a rotating frame, a motor, a fixed roller, a movable roller and a first cylinder, the rotating frame and the sealing cover are rotatably arranged, the motor is fixed on the sealing cover, and the output shaft of the motor is fixedly connected to the rotating frame, the fixed roller is rotatably installed on the rotating frame, a first slide groove is arranged on the rotating frame, and first sliders are arranged at both ends of the movable roller, the first cylinder is provided with two and is installed on the rotating frame, the piston of the first cylinder is fixedly connected to the first slider, the movable roller is driven by the first cylinder to contact with the fixed roller for clamping the packaging bag, and the highest point of the outer circle of the fixed roller at the lowest position contacts the first conveyor belt and the second conveyor The conveying height of the belt is flush, and the sealing mechanism comprises a vacuum device, an air duct, a sealing component, a heat sealing component, a second slider and a second cylinder, and the second cylinder and the second slider are both provided with two, and two ends of the air duct are fixedly connected to the second slider, and a second slide groove is provided on the sealing cover, and the second slide groove has an inclined angle with the horizontal plane, the second slide groove is slidably arranged in the second slide groove, the second cylinder is fixed on the sealing cover, and the piston of the second cylinder is fixedly connected to the second slider, the air duct is provided with an open part, the heat sealing component and the sealing component are both installed in the open part, a connecting hole is provided between the open part and the air duct, the heat sealing component is arranged away from the connecting hole and is used to heat seal the packaging bag after vacuumization, an air duct is connected between the vacuum device and the air duct, and a driving mechanism for driving the sealing component and the heat sealing component to press the open part of the packaging bag is provided between the sealing cover and the open part, and a sensor for detecting the position of the packaging bag is provided in the open part.

[0005] Preferably, the sealing assembly includes a fixed block and a flexible sealing sheet, two of each of the fixed block and the flexible sealing sheet are provided, one end of the flexible sealing sheet is fixed at the connecting hole, and the other end is fixedly connected to the fixed block, the heat sealing assembly includes two heat sealing blocks, the heat sealing block and the fixed block are both slidably arranged in the open portion, and the flexible sealing sheet is in an eight-shaped structure when the packaging bag is not clamped.

[0006] Preferably, the driving mechanism includes a third cylinder, a first limiting rod, a second limiting rod, a first spring, a second spring, a driving block and a reset assembly, one end of the first limiting rod and the second limiting rod are respectively fixedly connected to the fixed block and the heat sealing block after passing through the open portion, the first spring is sleeved on the outer side of the first limiting rod, and exerts a force on the two fixed blocks to move away from each other, the second spring is sleeved on the outer side of the second limiting rod, and exerts a force on the two heat sealing blocks to move away from each other, the third cylinder is installed on the sealing cover, and the installation position of the third cylinder is located when the second slide groove is flipped toward the near side. On the extension line of the mechanism direction, the reset assembly includes a first limiting bolt and a third spring, the drive block is in a U-shaped structure, one end of the first limiting bolt passes through the drive block and is fixedly connected to the open part, the third spring is sleeved on the outside of the first limiting bolt, and exerts an action on the drive block to approach the third cylinder, and the positions of the drive block corresponding to the first limiting rod and the second limiting rod are provided with a first wedge surface and a second wedge surface. When the third cylinder pushes the drive block to move toward the center of the open part, the first wedge surface interferes with the first limiting rod before the second wedge surface interferes with the second limiting rod.

[0007] Preferably, the rotating frame includes a mounting plate and a transmission rod, two mounting plates are provided, the first cylinder, the first slider and the fixed roller are all provided on the mounting plate, both ends of the transmission rod are fixedly connected to the mounting plate, and the output shaft of the motor is fixedly connected to the transmission rod.

[0008] Preferably, a guide rod is provided in the middle of the mounting plate, and an arc groove is provided on the sealing cover, the center of the arc groove is located on the axis of the transmission rod, and the central angle of the arc groove is 20°-30°. One end of the guide rod is slidably set in the arc groove.

[0009] Preferably, two sets of guide assemblies are provided at a position of the frame near the first conveyor belt, and the guide assemblies include a fixed plate, a movable plate, a second limiting bolt, a fourth spring and an adjusting bolt. The fixed plate is fixed to the frame, and one end of the second limiting bolt passes through the fixed plate and is fixedly connected to the movable plate. The fourth spring is sleeved on the second limiting bolt and applies a force to the movable plate to approach the fixed plate. The middle part of the adjusting bolt is threadedly connected to the fixed plate, and one end of the adjusting bolt contacts the movable plate. The movable plate is located on the front side of the feeding direction of the first conveyor belt and has a material guiding slope.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] The packaging bag containing the material is placed on the first conveyor belt, and then the flipping mechanism clamps the open position of the packaging bag, and then flips it at a certain angle so that the part of the packaging bag extending out of the movable roller and the fixed roller faces the sealing mechanism, and the packaging bag is vacuumed and heat-sealed in turn by relying on the sealing mechanism. The whole process does not require manual operation, and continuous automatic vacuum heat sealing can be achieved, thereby greatly improving the efficiency of production and processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of a vacuum packaging machine of the present invention;

[0013] Figure 2 This is a schematic diagram of the internal structure of a vacuum packaging machine of the present invention;

[0014] Figure 3 It is a structural schematic diagram of the turning mechanism in the present invention;

[0015] Figure 4 It is a structural schematic diagram of the sealing mechanism in the present invention;

[0016] Figure 5 It is a schematic diagram of the structure of the driving block, the sealing component and the heat sealing component in the present invention;

[0017] Figure 6 It is a structural schematic diagram of the guide assembly in the present invention;

[0018] Figure numerals: 1, frame; 2, first conveyor belt; 3, guide assembly; 4, sealing cover; 5, sealing mechanism; 6, second conveyor belt; 7, third cylinder; 8, arc groove; 9, transmission rod; 10, fixed roller; 11, turning mechanism; 12, movable roller; 13, second slide; 14, motor; 15, guide rod; 16, first slide; 17, first slider; 18, mounting plate; 19, second cylinder; 20, air guide tube; 21, first limit bolt; 22, second wedge surface; 23, first A wedge-shaped surface; 24, heat sealing block; 25, first spring; 26, second spring; 27, second limiting rod; 28, second slider; 29, driving block; 30, first limiting rod; 31, open portion; 32, air duct; 33, third spring; 34, flexible sealing sheet; 35, connecting hole; 36, fixing block; 37, fixing plate; 38, adjusting bolt; 39, fourth spring; 40, second limiting bolt; 41, material guiding slope; 42, movable plate; 43, first cylinder; 44, rotating frame. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1-Figure 6 As shown, a vacuum packaging machine includes a frame 1, a first conveyor belt 2, a second conveyor belt 6, and a sealing mechanism 5. The first conveyor belt 2 and the second conveyor belt 6 are installed in the frame 1 in a straight line. A sealing cover 4 is arranged in the middle of the frame 1. A turning mechanism 11 is arranged at the position where the first conveyor belt 2 and the second conveyor belt 6 are connected. The turning mechanism 11 includes a rotating frame 44, a motor 14, a fixed roller 10, a movable roller 12 and a first cylinder 43. The rotating frame 44 is rotatably arranged with the sealing cover 4, the motor 14 is fixed on the sealing cover 4, and the motor 1 The output shaft of 4 is fixedly connected to the rotating frame 44, the fixed roller 10 is rotatably mounted on the rotating frame 44, the rotating frame 44 is provided with a first slide 16, the two ends of the movable roller 12 are provided with a first slider 17, the first cylinder 43 is provided with two, and it is installed on the rotating frame 44, the piston of the first cylinder 43 is fixedly connected to the first slider 17, the movable roller 12 is driven by the first cylinder 43 to contact with the fixed roller 10 to clamp the packaging bag, and the highest point of the outer circle of the fixed roller 10 at the lowest position is in contact with the first conveyor belt 2 and the second conveyor belt 6 The conveying height is flush, the sealing mechanism 5 includes a vacuum device, an air duct 32, a sealing component, a heat sealing component, a second slider 28 and a second cylinder 19, two of the second cylinder 19 and the second slider 28 are provided, both ends of the air duct 32 are fixedly connected to the second slider 28, a second slide groove 13 is provided on the sealing cover 4, the second slide groove 13 has an inclined angle with the horizontal plane, the second slider 28 is slidably arranged in the second slide groove 13, the second cylinder 19 is fixed on the sealing cover 4, and the piston of the second cylinder 19 is fixed to the second slider 28 The air duct 32 is fixedly connected, an open portion 31 is provided on the air duct 32, a heat sealing component and a sealing component are both installed in the open portion 31, a connecting hole 35 is provided between the open portion 31 and the air duct 32, the heat sealing component is arranged away from the connecting hole 35, and is used to heat-seal the vacuumed packaging bag, an air duct 20 is connected between the vacuum device and the air duct 32, a driving mechanism for driving the sealing component and the heat sealing component to press the open portion of the packaging bag is provided between the sealing cover 4 and the open portion 31, and a sensor for detecting the position of the packaging bag is provided in the open portion 31.

[0021] The sealing component includes a fixed block 36 and a flexible sealing sheet 34. Two fixed blocks 36 and two flexible sealing sheets 34 are provided. One end of the flexible sealing sheet 34 is fixed at the connecting hole 35, and the other end is fixedly connected to the fixed block 36. The heat sealing component includes two heat sealing blocks 24. The heat sealing block 24 and the fixed block 36 are both slidably arranged in the open portion 31. The flexible sealing sheet 34 is in an eight-shaped structure when the packaging bag is not clamped. The flexible sealing sheet 34 can be a rubber sheet or a rubber sheet. In a normal state, the two fixed blocks 36 and the two heat sealing blocks 24 are in a state of being away from each other. When the two fixed blocks 36 collide with each other, the flexible sealing sheet 34 can divide the inner cavity of the open portion 31 into two parts, thereby preparing for the vacuum treatment of the packaging bag. When the two heat sealing blocks 24 collide with each other, the packaging bag can be heat-sealed in the power-on state.

[0022] The driving mechanism includes a third cylinder 7, a first limiting rod 30, a second limiting rod 27, a first spring 25, a second spring 26, a driving block 29 and a reset assembly. One end of the first limiting rod 30 and the second limiting rod 27 pass through the open portion 31 and are fixedly connected to the fixed block 36 and the heat sealing block 24 respectively. The first spring 25 is sleeved on the outer side of the first limiting rod 30 and applies a force to move the two fixed blocks 36 away from each other. The second spring 26 is sleeved on the outer side of the second limiting rod 27 and applies a force to move the two heat sealing blocks 24 away from each other. The third cylinder 7 is installed on the sealing cover 4, and the installation position of the third cylinder 7 is located at On the extension line of the second slide groove 13 in the direction close to the flip mechanism 11, the reset component includes a first limiting bolt 21 and a third spring 33. The driving block 29 is a U-shaped structure. One end of the first limiting bolt 21 passes through the driving block 29 and is fixedly connected to the open portion 31. The third spring 33 is sleeved on the outer side of the first limiting bolt 21 and exerts a force close to the third cylinder 7 on the driving block 29. The positions of the driving block 29 corresponding to the first limiting rod 30 and the second limiting rod 27 have a first wedge surface 23 and a second wedge surface 22. When the third cylinder 7 pushes the driving block 29 to move toward the center of the open portion 31, the first wedge surface 23 and the third spring 33 are connected. The first limiting rod 30 contacts before the second wedge-shaped surface 22 contacts the second limiting rod 27. When the fixed roller 10 and the movable roller 12 clamp the open position of the packaging bag and flip it over at a certain angle, the second cylinder 19 drives the air duct 32 to move to the position closest to the flipping mechanism 11, so that the open position of the packaging bag enters between the two fixed blocks 36. Then the third cylinder 7 drives the driving block 29 to move a distance toward the center of the open portion 31 and then stops, so that the first limiting rod 30 moves along the first wedge-shaped surface 23 first, and the two fixed blocks 36 drive the flexible sealing sheet 34 to move to press the open position of the packaging bag, without The packaging bag will be completely compressed, and the air in the packaging bag can be normally extracted. Then the vacuum device can perform vacuum treatment on the packaging bag. Then the third cylinder 7 drives the driving block 29 to continue to move, so that the second limiting rod 27 moves along the second wedge surface 22, so that the two heat sealing blocks 24 conflict with each other, and the packaging bag is heat-sealed when power is turned on. When the piston of the third cylinder 7 retracts, the driving block 29 is reset by the third spring 33, so that the two heat sealing blocks 24 and the fixed block 36 are respectively moved away from each other, and then the sealing mechanism 5 is reset to separate the sealing part of the packaging bag from the open part 31, and the vacuum heat sealing process can be completed.

[0023] The rotating frame 44 includes a mounting plate 18 and a transmission rod 9. The mounting plate 18 is provided with two. The first cylinder 43, the first slider 17 and the fixed roller 10 are all arranged on the mounting plate 18. Both ends of the transmission rod 9 are fixedly connected to the mounting plate 18. The output shaft of the motor 14 is fixedly connected to the transmission rod 9. A guide rod 15 is arranged in the middle of the mounting plate 18. An arc groove 8 is arranged on the sealing cover 4. The center of the arc groove 8 is located on the axis of the transmission rod 9, and the center angle of the arc groove 8 is 20°-30°. One end of the guide rod 15 is slidably arranged in the arc groove 8. When the opening of the packaging bag passes through the fixed roller 10, the first slider 17 is driven by the first cylinder 43 to slide downward in the first slide groove 16, so that the movable roller 12 conflicts with the fixed roller 10, so that the two can clamp the opening position of the packaging bag, and then the motor 14 drives the transmission rod 9 Rotate so that the two mounting plates 18 keep rotating synchronously. The guide rod 15 can provide guidance and support for the rotation of the mounting plate 18, and control the rotation angle of the mounting plate 18, so that the open position of the packaging bag can remain basically parallel to the open part 31 of the air duct 32 after rotation, preparing for subsequent vacuum heat sealing. After the packaging bag is vacuum heat sealed, the transmission rod 9 and the mounting plate 18 are driven by the motor 14 to rotate in the opposite direction and reset. The movable roller 12 moves to the top of the mounting plate 18 driven by the first cylinder 43, and the fixed roller 10 moves to the lowest point as the mounting plate 18 rotates, and the fixed roller 10 is located between the first conveyor belt 2 and the second conveyor belt 6. The packaging bag can smoothly pass through the fixed roller 10 and enter the second conveyor belt 6 under the continued drive of the first conveyor belt 2, so that continuous feeding can be achieved.

[0024] Two sets of guide assemblies 3 are arranged at the position of the frame 1 near the first conveyor belt 2. The guide assemblies 3 include a fixed plate 37, a movable plate 42, a second limiting bolt 40, a fourth spring 39 and an adjusting bolt 38. The fixed plate 37 is fixed to the frame 1. One end of the second limiting bolt 40 passes through the fixed plate 37 and is fixedly connected with the movable plate 42. The fourth spring 39 is sleeved on the second limiting bolt 40 and applies a force to the movable plate 42 close to the fixed plate 37. The middle part of the adjusting bolt 38 is threadedly connected with the fixed plate 37, and one end of the adjusting bolt 38 is in contact with the movable plate 42. The movable plate 42 is located at the front side of the feeding direction of the first conveyor belt 2 and has a material guiding slope 41. By rotating the adjusting bolt 38, the distance between the two movable plates 42 is controlled, so that the packaging bag containing the material can be automatically centered when passing through the two movable plates 42. In this way, during the subsequent vacuum sealing process, the heat sealing line will not be skewed to cause defective products.

[0025] Working principle: Place the packaging bag containing materials on the first conveyor belt 2, and turn the opening of the packaging bag toward the second conveyor belt 6. The packaging bag and the articles can be positioned and centered by relying on the guide component 3, and the opening of the packaging bag can be kept perpendicular to the conveying direction of the first conveyor belt 2. Then the relative position of the packaging bag is detected by the sensor. The sensor can be in the form of a proximity switch, an infrared sensor, etc. When the opening position of the packaging bag passes through the fixed roller 10, the first conveyor belt 2 stops conveying, and the first cylinder 43 drives the movable roller 12 to move downward and clamp the opening position of the packaging bag. There is enough margin for the length of the opening of the packaging bag to pass through the movable roller 12 and the fixed roller 10. Then the motor 14 drives the rotating frame 44 to rotate a certain angle, so that the opening position of the packaging bag is inclined and basically remains parallel to the opening portion 31 of the air duct 32. Then the second cylinder 19 drives the air duct 32 to approach The flipping mechanism 11 allows the open position of the packaging bag to enter between the two fixed blocks 36, and then the third cylinder 7 drives the driving block 29 to move a distance first, allowing the two fixed blocks 36 to press the open position of the packaging bag first, and then the vacuum device performs vacuum treatment on the packaging bag. Since the flexible sealing sheet 34 can block the outside air from entering the connecting hole 35, this can shorten the vacuum treatment time of the packaging bag. Then the third cylinder 7 drives the driving block 29 to move another distance, and the flexible sealing sheet 34 still remains in a sealed state. At the same time, the two heat sealing blocks 24 perform heat sealing treatment on the open mouth of the packaging bag. Finally, the heat sealing mechanism and the flipping mechanism 11 are reset, and the packaging bag is discharged under the action of the first conveyor belt 2 and the second conveyor belt 6. The packaging bag containing materials can be subjected to the next vacuum heat sealing treatment. The whole process does not require manual operation, which can greatly improve the efficiency of vacuum packaging.

[0026] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0027] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A vacuum packaging machine, comprising a frame (1), a first conveyor belt (2), a second conveyor belt (6), and a sealing mechanism (5), characterized in that: The first conveyor belt (2) and the second conveyor belt (6) are installed in a straight line in the frame (1); a sealing housing (4) is provided in the middle of the frame (1); a turning mechanism (11) is provided at a position where the first conveyor belt (2) and the second conveyor belt (6) are connected; the turning mechanism (11) comprises a rotating frame (44), a motor (14), a fixed roller (10), a movable roller (12) and a first cylinder (43); the rotating frame (44) is rotatably arranged with the sealing housing (4); the motor (14) is fixed on the sealing housing (4), and the output shaft of the motor (14) is fixedly connected to the rotating frame (44); the fixed roller (10) is rotatably installed on the rotating frame (44); and a first slide groove ( 16), first sliders (17) are provided at both ends of the movable roller (12), two first cylinders (43) are provided and mounted on a rotating frame (44), the piston of the first cylinder (43) is fixedly connected to the first slider (17), the movable roller (12) is driven by the first cylinder (43) to contact the fixed roller (10) to clamp the packaging bag, the highest point of the outer circle of the fixed roller (10) at the lowest position is flush with the conveying height of the first conveyor belt (2) and the second conveyor belt (6), the sealing mechanism (5) comprises a vacuum device, an air guide pipe (32), a sealing component, a heat sealing component, a second slider (28) and a second cylinder (19), the second cylinder (19) and the second slider (28) are both provided with Two, both ends of the air duct (32) are fixedly connected to the second slider (28), the sealing cover (4) is provided with a second slide groove (13), the second slide groove (13) has an inclined angle with the horizontal plane, the second slider (28) is slidably arranged in the second slide groove (13), the second cylinder (19) is fixed on the sealing cover (4), and the piston of the second cylinder (19) is fixedly connected to the second slider (28), the air duct (32) is provided with an open part (31), the heat sealing component and the sealing component are both installed in the open part (31), a connecting hole (35) is provided between the open part (31) and the air duct (32), the heat sealing component is arranged away from the connecting hole (35), and is used for vacuumizing the packaging bag Heat sealing is performed, the sealing component comprises a fixed block (36) and a flexible sealing sheet (34), the heat sealing component comprises two heat sealing blocks (24), an air guide tube (20) is connected between the vacuum extraction device and the air guide tube (32), a driving mechanism for driving the sealing component and the heat sealing component to press the open part of the packaging bag is arranged between the sealing cover (4) and the open part (31), the driving mechanism comprises a third cylinder (7), a first limiting rod (30), a second limiting rod (27), a first spring (25), a second spring (26), a driving block (29) and a reset assembly, one end of the first limiting rod (30) and the second limiting rod (27) pass through the open part (31) and are fixedly connected to the fixed block (36) and the heat sealing block (24) respectively,The driving block (29) has a first wedge-shaped surface (23) and a second wedge-shaped surface (22) at positions corresponding to the first limiting rod (30) and the second limiting rod (27). When the third cylinder (7) pushes the driving block (29) to move toward the center of the open portion (31), the first wedge-shaped surface (23) contacts the first limiting rod (30) before the second wedge-shaped surface (22) contacts the second limiting rod (27). A sensor for detecting the position of the packaging bag is provided in the open portion (31).

2. A vacuum packaging machine according to claim 1, characterized in that: Two of the fixed blocks (36) and the flexible sealing sheets (34) are provided, one end of the flexible sealing sheet (34) is fixed at the communicating hole (35), and the other end is fixedly connected to the fixed block (36), the heat sealing block (24) and the fixed block (36) are both slidably arranged in the open portion (31), and the flexible sealing sheet (34) is in an eight-shaped structure when the packaging bag is not clamped.

3. A vacuum packaging machine according to claim 2, characterized in that: The first spring (25) is sleeved on the outer side of the first limiting rod (30) and applies a force to the two fixing blocks (36) to move away from each other. The second spring (26) is sleeved on the outer side of the second limiting rod (27) and applies a force to the two heat sealing blocks (24) to move away from each other. The third cylinder (7) is installed on the sealing cover (4), and the installation position of the third cylinder (7) is located on the extension line of the second slide groove (13) in the direction close to the flip mechanism (11). The reset component includes a first limiting bolt (21) and a third spring (33). The driving block (29) is a U-shaped structure. One end of the first limiting bolt (21) passes through the driving block (29) and is fixedly connected to the open part (31). The third spring (33) is sleeved on the outer side of the first limiting bolt (21) and applies a force to the driving block (29) to move close to the third cylinder (7).

4. A vacuum packaging machine according to claim 1, characterized in that: The rotating frame (44) comprises a mounting plate (18) and a transmission rod (9), two mounting plates (18) are provided, the first cylinder (43), the first slider (17) and the fixed roller (10) are all provided on the mounting plate (18), both ends of the transmission rod (9) are fixedly connected to the mounting plate (18), and the output shaft of the motor (14) is fixedly connected to the transmission rod (9).

5. A vacuum packaging machine according to claim 4, characterized in that: A guide rod (15) is arranged in the middle of the mounting plate (18), and an arc groove (8) is arranged on the sealing cover (4). The center of the arc groove (8) is located on the axis of the transmission rod (9), and the center angle of the arc groove (8) is 20°-30°. One end of the guide rod (15) is slidably arranged in the arc groove (8).

6. A vacuum packaging machine according to claim 1, characterized in that: Two sets of guide assemblies (3) are arranged at positions of the frame (1) near the first conveyor belt (2). The guide assemblies (3) include a fixed plate (37), a movable plate (42), a second limiting bolt (40), a fourth spring (39) and an adjusting bolt (38). The fixed plate (37) is fixed to the frame (1). One end of the second limiting bolt (40) passes through the fixed plate (37) and is fixedly connected to the movable plate (42). The fourth spring (39) is sleeved on the second limiting bolt (40) and applies a force to the movable plate (42) to approach the fixed plate (37). The middle part of the adjusting bolt (38) is threadedly connected to the fixed plate (37), and one end of the adjusting bolt (38) contacts the movable plate (42). The movable plate (42) is located at the front side of the first conveyor belt (2) in the feeding direction and has a material guiding inclined surface (41).

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