Vacuum-pumping sealing equipment for packaging machine

Abstract

The utility model relates to the technical field of packaging machinery, in particular to vacuum-pumping sealing equipment for a packaging machine, which comprises a sealing mechanism, a bag pulling driving mechanism, a reciprocating motion driving mechanism and two groups of vacuum-pumping mechanisms, the bag pulling driving mechanism, the reciprocating motion driving mechanism and the two sets of vacuumizing mechanisms are arranged at the input end of the sealing mechanism. The reciprocating motion driving mechanism is configured to drive the two vacuumizing mechanisms to stretch into bag openings of the packaging bags located in the sealing mechanism. The bag pulling driving mechanism is configured to drive the two sets of vacuumizing mechanisms to relatively move towards the two ends of the packaging bag and stretch towards the two sides from a bag opening of the packaging bag; the two sets of vacuumizing mechanisms are configured to conduct vacuumizing operation on the packaging bag, and the sealing mechanism is configured to seal a bag opening of the vacuumized packaging bag. By means of the vacuumizing sealing equipment, the problem that in the prior art, the structure is complex can be effectively solved, bag opening arrangement and vacuumizing are achieved through reciprocating movement of the vacuumizing pipe, and follow-up sealing operation is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging machinery, in particular to a vacuum sealing device for a packaging machine. Background Art

[0002] A packaging machine is a machine that uses pre-made packaging bags to package materials. It is completed by putting the packaging bag on the material, or a packaging machine that puts the material into the packaging bag. After the material is put into the packaging bag, the opening of the packaging bag needs to be sealed. Some packaging machines also need to perform vacuum treatment before sealing.

[0003] In the prior art, a Chinese invention patent document with publication number CN117125302A and publication date November 28, 2023 is proposed. The technical solution disclosed in the patent document is as follows: a bagging vacuum sealing machine, wherein a mounting base is mounted on a fixed vertical plate, a fixed bracket is mounted on the mounting base, an exhaust pipe is lifted and lowered on the mounting base, support plates are provided at both longitudinal ends of the fixed bracket, a first heating and sealing assembly and a second heating and sealing assembly are arranged below, and are swayed and mounted on the support plate through a heating parallel linkage mechanism, an auxiliary clamping device is also installed below the support plate, located below the first heating and sealing assembly and the second heating and sealing assembly, the auxiliary clamping device includes a first auxiliary clamping block and a second auxiliary clamping block, the first auxiliary clamping block and the second auxiliary clamping block are both provided with a lower strip groove for avoiding the exhaust pipe, and both ends are swingably mounted on the support plate through a clamping parallel linkage mechanism, and a pre-opening device is provided on the fixed bracket.

[0004] In the above technical solution, during the vacuuming process, the vacuum pipe is driven down to enter the bag to achieve vacuuming, and the vacuum pipe is driven up again after the vacuuming is completed. In this process, an auxiliary clamping device is also required to clamp the bag opening, which has a complex structure and requires a high degree of coordination with the sealing component. Summary of the invention

[0005] In order to solve the above technical problems, the utility model proposes a vacuum sealing device for a packaging machine, which can effectively solve the problem of complex structure of the prior art. The vacuum tube can not only complete the vacuum work, but also straighten the packaging bag into shape, complete the bag opening tidying operation, and facilitate the subsequent sealing operation.

[0006] The utility model is realized by adopting the following technical solutions:

[0007] A vacuum sealing device for a packaging machine comprises a sealing mechanism, a bag pulling drive mechanism, a reciprocating drive mechanism and two groups of vacuum mechanisms; the bag pulling drive mechanism, the reciprocating drive mechanism and the two groups of vacuum mechanisms are arranged at the input end of the sealing mechanism, and are configured to perform bag opening arrangement operations and vacuum operations on the packaging bags input into the sealing mechanism; the reciprocating drive mechanism is configured to drive the two groups of vacuum mechanisms to extend into the bag opening of the packaging bag located in the sealing mechanism; the bag pulling drive mechanism is configured to drive the two groups of vacuum mechanisms to move relative to each other toward the two ends of the packaging bag, and stretch to both sides in the bag opening of the packaging bag; the two groups of vacuum mechanisms are configured to perform vacuum operations on the packaging bag located in the sealing mechanism, and the sealing mechanism is configured to seal the bag opening of the packaging bag after the vacuum mechanism has vacuumed the packaging bag in the sealing mechanism.

[0008] Each set of vacuum pumping mechanisms comprises a vacuum pumping tube, and the end of the vacuum pumping tube extending into the packaging bag is flat.

[0009] The bag pulling driving mechanism, the reciprocating driving mechanism and the sealing mechanism are integrated and assembled together.

[0010] The bag pulling drive mechanism is assembled at the input end of the sealing mechanism through a first mounting substrate; the bag pulling drive mechanism includes a bag pulling drive assembly, a connecting bracket 1 and a connecting bracket 2; the connecting bracket 1 and the connecting bracket 2 are slidably assembled on the first mounting substrate, and the bag pulling drive assembly drives the connecting bracket 1 and the connecting bracket 2 to reciprocate relative motion.

[0011] The reciprocating drive mechanism is provided with two groups, which are respectively connected to the vacuum pumping mechanism; the two groups of reciprocating drive mechanisms are respectively assembled on the upper ends of the connecting bracket 1 and the connecting bracket 2.

[0012] The bag pulling drive assembly comprises a bag pulling drive motor and a crank connecting rod transmission component.

[0013] The reciprocating drive mechanism is a cylinder.

[0014] It also includes a second mounting substrate, and both ends of the connecting bracket 1 are slidably assembled on the first mounting substrate and the second mounting substrate, and both ends of the connecting bracket 2 are slidably assembled on the first mounting substrate and the second mounting substrate.

[0015] The bag pulling driving mechanism, the reciprocating driving mechanism and the sealing mechanism are relatively independent.

[0016] The bag pulling drive mechanism is assembled at the input end of the sealing mechanism through a mounting seat; the bag pulling drive mechanism includes a bag pulling drive assembly, a first connecting seat and a second connecting seat; two sets of vacuum pumping mechanisms are respectively connected to the first connecting seat and the second connecting seat, and the bag pulling drive assembly drives the first connecting seat and the second connecting seat to reciprocate relative motion.

[0017] The bag pulling drive assembly comprises a servo bag pulling motor and a synchronous belt transmission assembly.

[0018] The reciprocating driving mechanism comprises a reciprocating driving assembly and a sliding block, wherein the sliding block is connected to the bag pulling driving mechanism; the reciprocating driving assembly drives the sliding block to move reciprocatingly.

[0019] The reciprocating drive assembly includes a reciprocating drive servo motor and a crank-connecting rod transmission assembly.

[0020] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0021] 1. In the utility model, after the reciprocating drive mechanism drives the two sets of vacuuming mechanisms to be inserted into the bag mouth of the packaging bag in the sealing mechanism, the bag pulling drive mechanism can drive the two sets of vacuuming mechanisms to move in opposite directions in the packaging bag, so that the two sets of vacuuming mechanisms can move to both sides of the packaging bag, straighten the packaging bag and form it, so that the bag mouth of the packaging bag forms an "I" shape, which is convenient for subsequent sealing operations. Through the mutual cooperation of the bag pulling drive mechanism and the reciprocating drive mechanism, no additional bag mouth shaping components are required, and the vacuuming tube can complete the vacuuming operation and the bag mouth finishing operation in the reciprocating motion, and has a good cooperation relationship with the sealing mechanism, and does not interfere with other components of the packaging machine.

[0022] 2. In the utility model, the end of the vacuum tube inserted into the packaging bag is flat, which is convenient for better completing the vacuum operation and the bag mouth shaping operation.

[0023] 3. The bag pulling drive mechanism, the reciprocating drive mechanism and the sealing mechanism are integrated and assembled together, so that the bag opening shaping, vacuuming and sealing actions can better cooperate with each other, and the packaging machine is more efficient.

[0024] 4. In the utility model, the bag pulling drive mechanism and the reciprocating drive mechanism have simple structures and stable operations.

[0025] 5. The two ends of the connecting bracket 1 and the connecting bracket 2 are respectively slidably assembled on the first mounting substrate and the second mounting substrate, so that the operation of the connecting bracket 1 and the connecting bracket 2 is more stable, and the operation of the reciprocating driving mechanism and the vacuum pumping mechanism assembled on the connecting bracket 1 and the connecting bracket 2 is also more stable.

[0026] 6. The bag pulling drive mechanism, the reciprocating drive mechanism and the sealing mechanism are relatively independent, which facilitates the reasonable arrangement of the positions of the bag pulling drive mechanism, the reciprocating drive mechanism and the sealing mechanism according to actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementations, wherein:

[0028] Figure 1 This is a schematic diagram of one structure of the utility model;

[0029] Figure 2 for Figure 1 A schematic diagram of the structure and the coordination with other components;

[0030] Figure 3 Another structural schematic diagram of the utility model;

[0031] Markings in the figure:

[0032] 1. Vacuum tube, 2. Sealing mechanism, 3. First mounting substrate, 4. Bag pulling drive motor, 5. First crank, 6. First connecting rod, 7. Connecting bracket one, 8. Second mounting substrate, 9. Servo bag pulling motor, 10. Mounting seat, 11. First connecting seat, 12. Synchronous belt, 13. Reciprocating drive servo motor, 14. Crank-connecting rod transmission assembly, 15. Conveying mechanism, 16. Cylinder, 17. Connecting bracket two; 18. Second connecting seat, 19. Second connecting rod. DETAILED DESCRIPTION

[0033] Example 1

[0034] As a basic embodiment of the utility model, the utility model includes a vacuum sealing device for a packaging machine, including a sealing mechanism 2, a bag pulling drive mechanism, a reciprocating drive mechanism and two sets of vacuum mechanisms. The bag pulling drive mechanism, the reciprocating drive mechanism and the two sets of vacuum mechanisms are arranged at the input end of the sealing mechanism 2 and are configured to perform bag opening arrangement operations and vacuum operations on the packaging bags input into the sealing mechanism 2.

[0035] The reciprocating drive mechanism is configured to drive the two sets of vacuum pumping mechanisms to extend into the bag opening of the packaging bag located in the sealing mechanism 2. The bag pulling drive mechanism is configured to drive the two sets of vacuum pumping mechanisms to move relative to each other at both ends of the packaging bag, and stretch the bag opening of the packaging bag to both sides. The two sets of vacuum pumping mechanisms are configured to perform vacuum pumping operations on the packaging bag located in the sealing mechanism 2. The sealing mechanism 2 is configured to seal the bag opening of the packaging bag after the vacuum pumping mechanism vacuum pumps the packaging bag in the sealing mechanism 2. When the sealing is completed, the bag pulling drive mechanism and the reciprocating drive mechanism drive the vacuum pumping mechanism to reset.

[0036] Example 2

[0037] As a preferred embodiment of the utility model, this embodiment further refines and supplements the technical solutions of the bag pulling drive mechanism and the reciprocating drive mechanism on the basis of Example 1. The bag pulling drive mechanism is directly connected to the vacuum pumping mechanism, driving the two groups of vacuum pumping mechanisms to move toward each other or move in opposite directions in the packaging bag. Specifically, the bag pulling drive mechanism may include a mounting bracket, a servo motor, a reducer and a double-threaded screw. The servo motor and the reducer are connected and fixedly mounted on the mounting bracket. The double-threaded screw is rotatably mounted on the mounting bracket, and the output shaft of the reducer is connected to the double-threaded screw through a coupling. The double-threaded screw has two threaded sections with opposite thread directions, and the threaded sections at both ends are respectively provided with connecting nuts that match them. The two groups of vacuum pumping mechanisms are respectively connected to the two connecting nuts.

[0038] The reciprocating drive mechanism is indirectly connected to the vacuum pumping mechanism. Specifically, the reciprocating drive mechanism is directly connected to the mounting bracket of the bag pulling drive mechanism, driving the bag pulling drive mechanism to move back and forth, and further driving the two groups of vacuum pumping mechanisms to move back and forth, so that the vacuum pumping mechanism can be inserted into or withdrawn from the packaging bag. Specifically, the reciprocating drive mechanism can be a linear drive assembly, including a cylinder drive, a ball screw drive, or a gear rack drive. Since this structure is a conventional technical means in this field, it will not be described in detail in this embodiment.

[0039] Example 3

[0040] As another preferred embodiment of the utility model, this embodiment further refines and supplements the structure of the vacuum mechanism on the basis of embodiment 1 or embodiment 2. Each set of vacuum mechanisms includes a vacuum tube 1 and a vacuum pump connected to the vacuum tube 1. The vacuum tube 1 of the vacuum mechanism can be flat as a whole, or the end portion inserted into the packaging bag can be flat, so that when the packaging bag is straightened and formed, the bag opening of the packaging bag can be better shaped and convenient to seal.

[0041] Example 4

[0042] As another preferred embodiment of the utility model, this embodiment further refines and supplements the structure of the bag pulling drive mechanism and the reciprocating drive mechanism on the basis of embodiment 1 or embodiment 3. In this embodiment, the bag pulling drive mechanism, the reciprocating drive mechanism and the sealing mechanism 2 are integrated and assembled together. Specifically, the bag pulling drive mechanism and the reciprocating drive mechanism are each provided with two groups, which correspond to two groups of vacuum pumping mechanisms one by one. Each group of bag pulling drive mechanisms is respectively assembled at the input end of the sealing mechanism 2 through the first mounting substrate 3. Specifically, the first mounting substrate 3 is fixed on the sealing mechanism 2.

[0043] The bag pulling drive mechanism includes a bag pulling drive assembly, a connecting bracket 1 7 and a connecting bracket 2 17. The bag pulling drive assembly includes a bag pulling drive motor 4 and a crank connecting rod transmission component. The crank connecting rod transmission component includes a crank, a connecting rod and a sliding block. The bag pulling drive motor 4 is fixedly mounted on the first mounting substrate 3. Furthermore, two bag pulling drive motors 4 can be fixedly mounted on the same mounting substrate 3, respectively, to facilitate better spatial arrangement. The bag pulling drive motor 4 is connected to the crank to drive the crank to rotate. One end of the connecting rod is hinged to the crank, and the other end is hinged to the sliding block. A slide rail is provided on the first mounting substrate 3, and the connecting bracket 1 7 and the connecting bracket 2 17 are slidably mounted on the slide rail of the first mounting substrate 3. Two sets of reciprocating drive mechanisms are respectively mounted on the connecting bracket 1 7 and the connecting bracket 2 17, driving the corresponding vacuum pumping mechanism to move back and forth to insert or withdraw the packaging bag.

[0044] Example 5

[0045] As another preferred embodiment of the utility model, this embodiment further refines and supplements the structure of the bag pulling drive mechanism and the reciprocating drive mechanism on the basis of the embodiment 1 or the embodiment 3. Figure 1 And the instruction manual Figure 2 The bag pulling drive mechanism, the reciprocating drive mechanism and the sealing mechanism 2 are integrated together. In this embodiment, the sealing mechanism 2 adopts conventional technical means in the art, such as a frame, a cylinder bag pressing device and a knife sealing device, etc. The specific structure and connection relationship are not repeated here.

[0046] The bag pulling drive mechanism is assembled on the input end of the sealing mechanism 2 through the first mounting substrate 3. Specifically, the first mounting substrate 3 is fixed on the sealing mechanism 2. A slide rail is also provided on the first mounting substrate 3. The bag pulling drive mechanism includes a bag pulling drive assembly, a connecting bracket 1 7 and a connecting bracket 2 17. The bag pulling drive assembly includes a bag pulling drive motor 4 and a crank connecting rod transmission component. The bag pulling drive motor 4 is fixedly assembled on the first mounting substrate 3. The crank connecting rod transmission component includes a first crank 5, a first connecting rod 6 and a second connecting rod 19. The first crank 5 is fixedly connected to the output shaft of the bag pulling drive motor 4. The first crank 5 includes two connecting ends, and the two connecting ends can be symmetrically distributed along the center of the first crank 5. One end of the first connecting rod 6 is hinged to one of the connecting ends of the first crank 5, and the other end is hinged to the connecting bracket 1 7. One end of the second connecting rod 19 is hinged to the other connecting end of the first crank 5, and the other end is hinged to the connecting bracket 2 17. The connecting bracket 1 7 and the connecting bracket 2 17 are slidably assembled on the slide rail of the first mounting base plate 3 .

[0047] The reciprocating drive mechanism can be a cylinder 16, which is provided with two groups, respectively assembled on the upper ends of the connecting bracket 1 7 and the connecting bracket 2 17. The two groups of vacuum pumping mechanisms are respectively connected to the cylinder 16. Driven by the cylinder 16, the two groups of vacuum pumping mechanisms reciprocate to insert or withdraw the packaging bag. The bag pulling drive mechanism drives the connecting bracket 1 7 and the connecting bracket 2 17 to reciprocate along the slide rail direction, and further drives the reciprocating drive mechanism and the vacuum pumping mechanism on the connecting bracket 1 7 and the connecting bracket 2 17 to reciprocate, so as to realize the opposite movement of the vacuum pumping mechanism or the opposite movement in the packaging bag.

[0048] When in use, after the material is transported to the designated position by the conveying mechanism 15 of the packaging machine, the cylinder 16 starts to work, driving the vacuum tube 1 to extend into the packaging bag; the bag pulling drive motor 4 works at this time, driving the vacuum tube 1 to move to both sides of the bag opening, straightening the packaging bag into shape, and the vacuum pump starts to extract the air in the packaging bag. At this time, the cylinder bag pressing device is activated to press the packaging bag tightly, and the knife sealing device is started. At the same time, the cylinder 16 pulls the vacuum tube 1 out of the packaging bag, and the knife sealing device seals the packaging bag. Repeat the above steps to vacuum pack the product.

[0049] Example 6

[0050] As another preferred embodiment of the utility model, the utility model further supplements the structure of the connecting bracket 1 7 and the connecting bracket 2 17 on the basis of Example 5 or Example 6. Specifically, in the present embodiment, a second mounting substrate 8 is also provided, the second mounting substrate 8 is fixed on the sealing mechanism 2, and a slide rail is also provided on the second mounting substrate 8. The slide rail on the second mounting substrate 8 is arranged in parallel with the slide rail on the first mounting substrate 3, and is respectively located at the two ends of the connecting bracket 1 7 and the connecting bracket 2 17, so that the two ends of the connecting bracket 1 7 are slidably assembled on the first mounting substrate 3 and the second mounting substrate 8, and the two ends of the connecting bracket 2 17 are also slidably assembled on the first mounting substrate 3 and the second mounting substrate 8, and the movement of the connecting bracket 1 7 and the connecting bracket 2 17 is more stable.

[0051] Example 7

[0052] As another preferred embodiment of the utility model, this embodiment further refines and supplements the structure of the bag pulling drive mechanism and the reciprocating drive mechanism on the basis of the embodiment 1 or the embodiment 3. Figure 3 The bag pulling drive mechanism, the reciprocating drive mechanism and the sealing mechanism 2 are relatively independent. In this embodiment, the sealing mechanism 2 adopts conventional technical means in the art, such as a frame, a cylinder bag pressing device and a knife sealing device, etc. The specific structural relationship is not repeated.

[0053] The bag pulling drive mechanism is assembled at the input end of the sealing mechanism 2 through the mounting seat 10. Specifically, the mounting seat 10 is independently arranged on one side of the input end of the sealing mechanism 2. The bag pulling drive mechanism includes a bag pulling drive assembly, a first connecting seat 11 and a second connecting seat 18. The bag pulling drive assembly includes a servo bag pulling motor 9 and a synchronous belt transmission assembly. The servo bag pulling motor 9 is fixedly assembled on the mounting seat 10, and the synchronous belt transmission assembly is assembled on the mounting seat 10. The output shaft of the servo bag pulling motor 9 is connected to the main drive pulley in the synchronous belt transmission assembly. Two sets of vacuum pumping mechanisms can be fixedly connected to the synchronous belt 12 of the synchronous belt transmission assembly through the first connecting seat 11 and the second connecting seat 18 respectively. The servo bag pulling motor 9 of the bag pulling drive mechanism is started, which drives the synchronous belt 12 to move, and further drives the two sets of vacuum pumping mechanisms to move toward or away from each other.

[0054] The reciprocating drive mechanism includes a reciprocating drive assembly and a sliding block. The reciprocating drive assembly includes a reciprocating drive servo motor 13 and a crank-connecting rod transmission assembly 14. The crank-connecting rod transmission assembly 14 includes a crank and a connecting rod. Specifically, the reciprocating drive mechanism can be fixed on a mounting frame, and the mounting frame is independently arranged on the input end side of the sealing mechanism 2. The reciprocating drive servo motor 13 is fixedly assembled on the mounting frame. The crank is fixedly connected to the output shaft of the reciprocating drive servo motor 13. One end of the connecting rod is hinged on the crank, and the other end is hinged to the sliding block. A slide rail is provided on the mounting frame or at the bottom of the conveying mechanism 15 of the packaging machine, and the sliding block can be slidably assembled on the slide rail of the mounting frame or the conveying mechanism 15. The mounting seat 10 is fixedly assembled on the sliding block.

[0055] The reciprocating drive servo motor 13 of the reciprocating drive mechanism is started, driving the sliding block to reciprocate along the slide rail, further driving the bag pulling drive mechanism and the vacuuming mechanism to reciprocate, so that the vacuuming tube 1 in the vacuuming mechanism can be inserted into or removed from the packaging bag.

[0056] When in use, after the material is transported to the designated position by the conveying mechanism 15, the reciprocating driving servo motor 13 starts to work, driving the vacuum tube 1 to extend into the packaging bag; the servo bag pulling motor 9 works at this time, driving the vacuum tube 1 to move to both sides of the bag opening, straightening the packaging bag into shape, and the vacuum pump starts to extract the air in the packaging bag; at this time, the cylinder bag pressing device is activated to press the packaging bag tightly, the knife sealing device is started, and the reciprocating driving servo motor 13 is simultaneously pulled out of the vacuum tube 1 from the packaging bag, and the knife sealing device seals the packaging bag. Repeat the above steps to vacuum pack the product.

[0057] Example 8

[0058] As another preferred embodiment of the utility model, this embodiment provides another reciprocating drive mechanism based on the embodiment 7. In this embodiment, the reciprocating drive mechanism can be a cylinder. The reciprocating drive mechanism is connected to the mounting seat 10.

[0059] Example 9

[0060] As another preferred embodiment of the present utility model, this embodiment further refines and supplements the structures of the bag pulling drive mechanism and the reciprocating drive mechanism on the basis of the embodiment 1 or the embodiment 3.

[0061] In this embodiment, the bag pulling drive mechanism is assembled at the input end of the sealing mechanism 2 through the mounting seat 10. Specifically, the mounting seat 10 is independently arranged on one side of the input end of the sealing mechanism 2. The bag pulling drive mechanism includes a bag pulling drive assembly, a first connecting seat 11 and a second connecting seat 18. The bag pulling drive assembly includes a servo bag pulling motor 9 and a synchronous belt transmission assembly. The servo bag pulling motor 9 is fixedly assembled on the mounting seat 10, and the synchronous belt transmission assembly is assembled on the mounting seat 10. The output shaft of the servo bag pulling motor 9 is connected to the main drive pulley in the synchronous belt transmission assembly. The first connecting seat 11 and the second connecting seat 18 are also fixedly connected to the synchronous belt 12 of the synchronous belt transmission assembly.

[0062] The reciprocating drive mechanism can be a cylinder 16, which is provided with two groups, respectively mounted on the upper ends of the first connecting seat 11 and the second connecting seat 18. The two groups of vacuum pumping mechanisms are respectively connected to the cylinder 16. Driven by the cylinder 16, the two groups of vacuum pumping mechanisms reciprocate to insert or withdraw the packaging bag. The servo bag pulling motor 9 of the bag pulling drive mechanism is started, driving the synchronous belt 12 to move, and further driving the vacuum pumping mechanisms to move toward or away from each other.

[0063] To sum up, after reading the utility model document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical scheme and technical concept of the utility model without creative mental labor, which all fall within the scope of protection of the utility model.

Claims

1. A vacuum sealing device for a packaging machine, characterized in that: The invention comprises a sealing mechanism (2), a bag-pulling driving mechanism, a reciprocating driving mechanism and two groups of vacuuming mechanisms; the bag-pulling driving mechanism, the reciprocating driving mechanism and the two groups of vacuuming mechanisms are arranged at the input end of the sealing mechanism (2) and are configured to perform bag opening arrangement operations and vacuuming operations on the packaging bags input into the sealing mechanism (2); the reciprocating driving mechanism is configured to drive the two groups of vacuuming mechanisms to extend into the bag opening of the packaging bag located in the sealing mechanism (2); the bag-pulling driving mechanism is configured to drive the two groups of vacuuming mechanisms to move relative to each other towards the two ends of the packaging bag, and to stretch the packaging bag towards both sides in the bag opening; the two groups of vacuuming mechanisms are configured to perform vacuuming operations on the packaging bag located in the sealing mechanism (2), and the sealing mechanism (2) is configured to seal the bag opening of the packaging bag after the vacuuming mechanism has vacuumed the packaging bag in the sealing mechanism (2).

2. The vacuum sealing device for a packaging machine according to claim 1, characterized in that: Each set of vacuum pumping mechanisms comprises a vacuum pumping tube (1), and the end of the vacuum pumping tube (1) extending into the packaging bag is flat.

3. A vacuum sealing device for a packaging machine according to claim 1 or 2, characterized in that: The bag pulling drive mechanism, the reciprocating drive mechanism and the sealing mechanism (2) are integrated and assembled together.

4. The vacuum sealing device for a packaging machine according to claim 3, characterized in that: The bag-pulling driving mechanism is mounted on the input end of the sealing mechanism (2) via a first mounting substrate (3); the bag-pulling driving mechanism comprises a bag-pulling driving assembly, a connecting bracket 1 (7) and a connecting bracket 2 (17); the connecting bracket 1 (7) and the connecting bracket 2 (17) are slidably mounted on the first mounting substrate (3), and the bag-pulling driving assembly drives the connecting bracket 1 (7) and the connecting bracket 2 (17) to reciprocate relative motion.

5. The vacuum sealing device for a packaging machine according to claim 4, characterized in that: The reciprocating drive mechanism is provided with two groups, which are respectively connected to the vacuum pumping mechanism; the two groups of reciprocating drive mechanisms are respectively assembled on the upper ends of the connecting bracket 1 (7) and the connecting bracket 2 (17).

6. The vacuum sealing device for a packaging machine according to claim 4, characterized in that: The bag pulling drive assembly comprises a bag pulling drive motor (4) and a crank connecting rod transmission component.

7. The vacuum sealing device for a packaging machine according to claim 5, characterized in that: The reciprocating drive mechanism is a cylinder (16).

8. The vacuum sealing device for a packaging machine according to claim 4, characterized in that: It also includes a second mounting substrate (8), the two ends of the connecting bracket 1 (7) are slidably mounted on the first mounting substrate (3) and the second mounting substrate (8), and the two ends of the connecting bracket 2 (17) are slidably mounted on the first mounting substrate (3) and the second mounting substrate (8).

9. A vacuum sealing device for a packaging machine according to claim 1 or 2, characterized in that: The bag pulling drive mechanism, the reciprocating drive mechanism and the sealing mechanism (2) are relatively independent.

10. The vacuum sealing device for a packaging machine according to claim 9, characterized in that: The bag pulling drive mechanism is assembled at the input end of the sealing mechanism (2) via a mounting seat (10); the bag pulling drive mechanism comprises a bag pulling drive assembly, a first connecting seat (11) and a second connecting seat (18); two sets of vacuum pumping mechanisms are respectively connected to the first connecting seat (11) and the second connecting seat (18), and the bag pulling drive assembly drives the first connecting seat (11) and the second connecting seat (18) to reciprocate relative motion.

11. The vacuum sealing device for a packaging machine according to claim 10, characterized in that: The bag pulling drive assembly comprises a servo bag pulling motor (9) and a synchronous belt transmission assembly.

12. The vacuum sealing device for a packaging machine according to claim 10, characterized in that: The reciprocating driving mechanism comprises a reciprocating driving assembly and a sliding block, wherein the sliding block is connected to the bag pulling driving mechanism; the reciprocating driving assembly drives the sliding block to move reciprocatingly.

13. The vacuum sealing device for a packaging machine according to claim 12, characterized in that: The reciprocating drive assembly comprises a reciprocating drive servo motor (13) and a crank-connecting rod transmission assembly (14).

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