Packaging bag extending and aligning device and extending method

Abstract

The invention discloses a packaging bag extending and aligning device which comprises a vacuum chamber conveying mesh belt, a vacuum chamber platform, a vacuum chamber housing assembly, a conveying mesh belt transmission assembly and a lifting assembly. The vacuum chamber conveying mesh belt is arranged on the vacuum chamber platform, the conveying mesh belt transmission assembly is connected to the lower end face of the vacuum chamber platform, and the output end of the conveying mesh belt transmission assembly penetrates through the vacuum chamber platform to be connected with the vacuum chamber conveying mesh belt. The vacuum chamber housing assembly is arranged above the vacuum chamber platform, the side wall of the vacuum chamber housing assembly is connected with the lifting assembly, and a vacuumizing generation hole is formed in the vacuum chamber platform. According to the packaging bag extending and aligning device and the extending method, the existing defects are overcome, the human input cost is effectively reduced, the automatic production process is achieved, the uniformity of bag stroking every time can be guaranteed, and therefore the effectiveness of downstream bag cutting is guaranteed.

Description

Technical Field

[0001] The invention relates to a packaging bag extension and alignment device and an extension method. Background Art

[0002] The packaging bag extension and alignment device is mainly used in the automatic double-layer bag removal equipment to automatically arrange the inner packaging bag, automatically straighten it from the initial folded and curled state, and transport it to the second layer outer bag cutting unit for cutting of the inner and outer bags.

[0003] There are currently three methods of automatic outer packaging bag extension and alignment on the market, all of which have certain defects.

[0004] Method 1: Mechanical extension (such as Figure 7 Mainly includes a cartridge delivery assembly (such as Figure 7 Component 92 shown), drum running component (such as Figure 7 Component 93 shown). When the nest box (such as Figure 7 The component 91 shown in the figure is transported by the cartridge component (such as Figure 7 The assembly 92 shown in FIG. 9 is clamped and moved horizontally to the right to the lower roller of the roller assembly (eg, Figure 7 When the subassembly 931 shown in FIG. 1 is directly above the upper roller of the roller assembly (such as Figure 7 Subassembly 932 shown), lower drum (such as Figure 7 The subassemblies 931 shown in the figure move towards each other and rotate. At this time, the corners of the outer packaging bag in the inner layer of the nest box touch the roller. Then, the clamping box conveying assembly reciprocates and withdraws. When the upper and lower rollers repeat to completely straighten the outer packaging bag, the sensor detects that the outer bag is stretched, and the roller running assembly (such as Figure 7 The assembly 93 shown in the figure rises as a whole to the top of the nest box, clamps the box conveying assembly, and transports the nest box after the outer bag is extended to the downstream mesh belt (such as Figure 7 94) shown in the figure, release the clamping claws, and the nest box (such as Figure 7 The component 95 shown is then cut off from the inner outer packaging bag downstream.

[0005] In mechanical extension, when the roller rotates and pulls the outer bag, it is easy to tear the outer bag, destroying the sterility of the internal nest box and easily generating a lot of particulate matter. In order to increase the friction with the outer bag surface in the roller area, there are many structural features that are difficult to clean and disinfect in the structural design. After the extension is completed, the roller area as a whole is directly above the outer bag of the nest box, which is easy to interfere with the laminar flow in the outer bag area, thereby failing to guarantee the cleanliness requirements of the unidirectional flow.

[0006] Method 2: Vacuum chamber extension (such as Figure 8As shown). The outer bag is mainly extended by using the principle that the outer bag has a breathing hole and can pass gas under negative pressure. The outer bag is extended by vacuuming twice. The existing extension method mainly includes a vacuum chamber platform (such as Figure 8 Component 112 shown), outer bag pull-out component (such as Figure 8 When the nest box stops at the feeding port of the vacuum chamber extension unit, the outer bag pulling assembly pulls the nest box onto the vacuum chamber platform, and the vacuum chamber cover assembly descends to the platform, traveling through the enclosed space, and performs two vacuuming operations. After the inner and outer bags are extended, the vacuum chamber cover assembly rises to the highest position, and the outer bag pulling assembly pulls the extended outer bag out to the set position (such as Figure 8 The outer bag is cut off and then moves along the Y direction to the set position (such as Figure 8 Component 116 shown), push the box and recycle the outer bag (such as Figure 8 Component 117 shown).

[0007] Compared with mechanical stretching, the existing vacuum stretching method causes less damage to the outer packaging bag and has higher sterility assurance in the automatic stretching unit. However, after the outer bag is cut off, it is restricted by the limited structural space and the nest box cannot be pushed downstream immediately. The nest box in the opening area of ​​the outer bag is at risk of cross-contamination, and the goal of contactless transfer of the nest box cannot be met.

[0008] Method 3: After the first layer of outer bags is semi-automatically removed, the outer bags of the nest box are manually smoothed to fit the mesh guardrail, and then the inner outer bags can be removed downstream. This method is only suitable for product lines with small batch production scales, and whether the outer bags are smoothed well depends directly on the operator's quantity, degree and mood, so it is difficult to control the uniformity of smoothing the bags.

[0009] Therefore, in order to solve the above problems, a packaging bag stretching and alignment device and stretching method are proposed. Summary of the invention

[0010] The purpose of the present invention is to overcome the existing defects and provide a packaging bag extension alignment device and extension method, which effectively reduces the manpower investment cost. The automated production process can ensure the uniformity of each bag rolling, thereby ensuring the effectiveness of downstream bag cutting.

[0011] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a packaging bag extension and alignment device, comprising a vacuum chamber conveyor mesh belt, a vacuum chamber platform, a vacuum chamber cover assembly, a conveyor mesh belt transmission assembly and a lifting assembly;

[0012] The vacuum chamber conveyor mesh belt is arranged on the vacuum chamber platform, the conveyor mesh belt transmission assembly is connected to the lower end surface of the vacuum chamber platform, and the output end of the conveyor mesh belt transmission assembly passes through the vacuum chamber platform and is connected to the vacuum chamber conveyor mesh belt; the vacuum chamber cover assembly is arranged above the vacuum chamber platform, the side wall of the vacuum chamber cover assembly is connected to the lifting assembly, and a vacuum pumping device is arranged on the vacuum chamber platform, and the extension is completed by vacuuming the packaging bag.

[0013] Preferably, the vacuum chamber cover assembly includes an upper pressure plate, one side of the upper pressure plate is connected to an upper limit plate; the front and rear of the upper pressure plate are connected to front and rear limit assemblies; the diagonal limit assemblies are connected to the diagonals of the upper pressure plate; and the outer side of the upper pressure plate is connected to the vacuum cover.

[0014] Preferably, the conveyor mesh belt transmission assembly comprises a main transmission column, a main transmission shaft is arranged inside the main transmission column, the main transmission shaft is connected to the vacuum chamber conveyor mesh belt, and a sealing assembly is arranged on the outer wall.

[0015] Preferably, the front and rear limiting components include a limiting frame, the limiting frame is rotatably connected to a first screw rod, the upper end of the first screw rod passes through the upper pressure plate, and the first screw rod is connected to a first fixing nut.

[0016] Preferably, the diagonal limiting assembly includes a second limiting plate, the second limiting plate is rotatably connected to a second screw rod, the upper end of the second screw rod passes through the upper pressure plate, and the second screw rod is connected to a second fixing nut.

[0017] Preferably, a retractable component is connected to the upper limit plate.

[0018] Preferably, mesh belt guardrails are provided on both sides of the vacuum chamber conveyor mesh belt, and the mesh belt guardrails are connected to the vacuum chamber platform.

[0019] Preferably, a nest-blocking box cylinder is provided at one end of the vacuum chamber conveyor belt.

[0020] Preferably, a special joint for threading and sealing is provided on the vacuum chamber platform.

[0021] Preferably, the lower port of the vacuum housing is connected to an aluminum alloy base.

[0022] A method for extending a packaging bag extension alignment device, comprising the following steps;

[0023] Step S1, the vacuum chamber conveyor belt transports the nest box to a suitable location;

[0024] Step S2, the lifting assembly drives the vacuum chamber cover assembly to descend to the vacuum chamber platform, and starts to extend the nest box packaging bag inside;

[0025] Step S3, after the extension is completed, the vacuum chamber conveyor belt transports the nest box to the next process.

[0026] Preferably, when the vacuum chamber conveyor belt transports the nest box to a suitable position, the nest box blocking cylinder will rise to block the nest box from moving forward.

[0027] The step S2 comprises:

[0028] Step S21, the lifting assembly drives the vacuum housing to descend to the vacuum chamber platform, the upper pressing plate presses the top of the nest box, and the upper limit plate on the side of the upper pressing plate is used to limit the outer bag welding edge from folding upward during the vacuuming process;

[0029] Step S22, the vacuum hole is vacuumed for a set time and then stops, and the packaging bag is stretched out;

[0030] Step S23, the lifting assembly drives the vacuum cover to rise to the initial position, the nest box blocking cylinder descends, and the vacuum chamber conveyor belt continues to convey the nest box to the next process.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: the packaging bag extension and alignment device and the extension method change the air volume in the inner outer bag by means of vacuum extraction to extend the corners of the inner outer packaging bag; in the double-layer outer packaging production process route, when the inner outer bag is automatically extended, both the damage to the packaging material and the contactless transfer of the packaging material, which are two incompatible process problems, are satisfied. The present invention can effectively reduce the manpower investment cost, and the automated production process can ensure the uniformity of each bag stroke, thereby ensuring the effectiveness of downstream bag cutting.

[0032] Under the premise of ensuring sterility, it can also meet the requirements of contactless packaging material transfer, and then reduce the workload of operators during mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 A top view of the packaging bag extension and alignment device of the present invention;

[0035] Figure 2 It is an axonometric diagram of the packaging bag extension and alignment device of the present invention;

[0036] Figure 3It is a detailed internal view of the packaging bag extension and alignment device of the present invention;

[0037] Figure 4 A detailed view of the conveyor belt transmission assembly of the present invention;

[0038] Figure 5 is a schematic diagram of the extension method of the present invention;

[0039] Figure 6 Detailed schematic diagram of step S2 of the extension method of the present invention;

[0040] Figure 7 It is a schematic diagram of the prior art;

[0041] Figure 8 It is a schematic diagram of the prior art II;

[0042] Fig. 9 This is the main view of the outer bag of the nest box;

[0043] Fig.10 Schematic diagram of the orientation of the nest box.

[0044] In the figure: 1. vacuum chamber conveyor mesh belt; 2. vacuum chamber platform; 3. vacuum chamber cover assembly; 4. conveyor mesh belt transmission assembly; 5. lifting assembly; 6. upper pressure plate; 7. upper limit plate; 8. vacuum cover; 9. main transmission column; 10. vacuum chamber bottom plate; 11. mounting seat mounting plate; 12. bevel gear mounting seat; 13. main transmission shaft; 14. first bearing; 15. second sealing ring limit block; 16. rotating sealing ring; 17. O-ring; 18. first sealing ring limit block; 19. plane bearing; 20. limit frame; 21. first screw; 22. first fixing nut; 23. second limiting plate; 24. second screw; 25. second fixing nut; 26. mesh belt guardrail; 27. nest box cylinder; 28. threading seal special joint; 29. ​​aluminum alloy base. DETAILED DESCRIPTION

[0045] 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.

[0046] The present invention is different from the existing vacuum extension structure layout, the old method uses the narrow side forward transportation (such as Fig.10 The nest box orientation is shown in Fig.10As shown), the nest box used in the present invention is transported forward by its wide side, and a conveyor belt drive assembly 4 is arranged above the vacuum chamber platform 2 of the present invention, while the vacuum chamber platform of the old method has no drive assembly and is only stored and left stationary.

[0047] See also Figure 1-4 A packaging bag stretching and alignment device comprises a vacuum chamber conveyor mesh belt 1, a vacuum chamber platform 2, a vacuum chamber cover assembly 3, a conveyor mesh belt transmission assembly 4 and a lifting assembly 5; the vacuum chamber conveyor mesh belt 1 is arranged on the vacuum chamber platform 2, the conveyor mesh belt transmission assembly 4 is connected to the lower end surface of the vacuum chamber platform 2, and the output end of the conveyor mesh belt transmission assembly 4 passes through the vacuum chamber platform 2 and is connected to the vacuum chamber conveyor mesh belt 1; the vacuum chamber cover assembly 3 is arranged above the vacuum chamber platform 2, the side wall of the vacuum chamber cover assembly 3 is connected with the lifting assembly 5, and a vacuum pumping device is arranged on the vacuum chamber platform 2, and the stretching is completed by vacuuming the packaging bag.

[0048] Specifically, the vacuum chamber cover assembly 3 includes an upper pressing plate 6, one side of which is connected to an upper limit plate 7; the front and rear of the upper pressing plate 6 are connected to front and rear limit assemblies; the diagonals of the upper pressing plate 6 are connected to diagonal limit assemblies; and the outer side of the upper pressing plate 6 is connected to a vacuum cover 8.

[0049] Specifically, the lifting assembly 5 drives the vacuum housing 8 to descend onto the vacuum chamber platform 2, the upper pressing plate 6 presses the top of the nest box, and the upper limit plate 7 on the side of the upper pressing plate 6 is used to limit the outer bag welding edge from folding upward during the vacuuming process.

[0050] Specifically, the front and rear limit assembly includes a limit frame 20, which is rotatably connected to a first screw rod 21, the upper end of which passes through the upper pressure plate 6, and a first fixing nut 22 is connected to the first screw rod 21. By loosening the first fixing nut 22, the first screw rod 21 can be rotated, and the height of the limit frame 20 can be adjusted.

[0051] Specifically, the diagonal limit assembly includes a second limit plate 23, the second limit plate 23 is rotatably connected to a second screw 24, the upper end of the second screw 24 passes through the upper pressing plate 6, and a second fixing nut 25 is connected to the second screw 24. By loosening the second fixing nut 25, the second screw 24 can be rotated, and the height of the second limit plate 23 can be adjusted.

[0052] Specifically, a retractable component is connected to the upper limit plate 7. The retractable component can be a guide rod and a reset spring; the nest box is eccentrically arranged relative to the symmetrical center plane of the conveyor mesh belt, mainly to reserve extension space for the welding edge extension, and the upper limit plate 7 of the welding edge is widened, and a retractable structure is added to the upper limit plate, which is mainly used for the outer bag to retract during the expansion process and reset when the air in the outer bag is exhausted. The limiting welding edge, a silicone plate is added under the limiting plate, mainly to increase the resistance of the welding edge when pressing the bag, and the clamping is more secure, so that the success rate of secondary vacuuming is higher.

[0053] Specifically, the conveyor mesh belt transmission assembly 4 includes a main transmission column 9, a main transmission shaft 13 is arranged inside the main transmission column 9, the main transmission shaft 13 is connected to the vacuum chamber conveyor mesh belt 1, and a sealing assembly is arranged on the outer wall, and the sealing assembly includes a second sealing ring limit block 15, an O-ring 17 and a first sealing ring limit block 18; the upper end of the main transmission column 9 is connected to the vacuum chamber bottom plate 10, the upper end of the vacuum chamber bottom plate 10 is connected to the mounting seat mounting plate 11, and the upper end of the mounting seat mounting plate 11 is connected to the bevel gear mounting seat 12; the main transmission A main transmission shaft 13 is arranged in the column 9, a first bearing 14 is arranged between the main transmission shaft 13 and the main transmission column 9, a second sealing ring limit block 15 is arranged above the first bearing 14, a rotating sealing ring 16 is arranged above the second sealing ring limit block 15, an O-ring 17 is arranged above the rotating sealing ring 16, a first sealing ring limit block 18 is arranged above the O-ring 17, and a plane bearing 19 is arranged on the first sealing ring limit block 18; the upper end of the main transmission column 9 is connected to the vacuum chamber conveyor mesh belt 1.

[0054] Specifically, in order to ensure the effectiveness and efficiency of vacuuming, it is necessary to make all the dynamic and static seals on and below the vacuum chamber bottom plate 10. The bevel gear mounting seat 12 and the mounting seat mounting plate 11 are connected with bolts, and the mounting seat mounting plate 11 is bolted to the vacuum chamber bottom plate 10, and the threaded holes corresponding to the vacuum chamber bottom plate 10 are blind holes, so there is no leakage between the bevel gear installation and the outside world; the main transmission column 9 and the vacuum chamber bottom plate 10 are statically sealed, the side of the first sealing ring limit block 18 and the main transmission column 9 are statically sealed with pistons, and the main transmission shaft 13 and the second sealing ring limit block 15 use a rotating sealing ring 16, which is suitable for sealing in the radial direction under rotating conditions.

[0055] Specifically, mesh guardrails 26 are provided on both sides of the vacuum chamber conveyor mesh belt 1, and the mesh guardrails 26 are connected to the vacuum chamber platform 2. The mesh guardrail 26 has a flat feed port design and a bell mouth, which is convenient for positioning and guiding, thereby ensuring the accuracy of the nest box position during the extension process, thereby improving the stability of the equipment.

[0056] Specifically, one end of the vacuum chamber conveyor mesh belt 1 is provided with a nest box blocking cylinder 27. When the vacuum chamber conveyor mesh belt 1 transports the nest box to a suitable position, the nest box blocking cylinder 27 will rise to block the nest box from moving forward.

[0057] Specifically, a special threading and sealing joint 28 is provided on the vacuum chamber platform 2. There are a total of 5 groups of cables on the vacuum chamber platform 2, including the nest box position detection sensor, the magnetic switch of the blocking box cylinder, and the air pipe of the blocking nest box cylinder, which need to pass through the platform and form a seal. All cables that need to pass through the platform pass through the special threading and sealing joint 28 inside the cover, pass through the platform, and go below the table top. The whole meets both the sealing requirements and the wireless function requirements. After the cover is installed, there is no need to maintain the space inside the cover during daily operations.

[0058] Specifically, the lower port of the vacuum housing 8 is connected to an aluminum alloy bottom bracket 29. The vacuum housing 8 has a reinforced structural design, and the bottom is designed with an aluminum alloy bottom bracket 29, which avoids the housing deformation caused by too large a unit area during the vacuuming process.

[0059] Specifically, when the vacuum chamber conveyor belt 1 transports the nest box to a suitable position, the nest box blocking cylinder 27 will rise to prevent the nest box from moving forward; then the lifting assembly 5 drives the vacuum cover 8 to descend to the vacuum chamber platform 2, and the upper pressure plate 6 presses the top of the nest box. The upper limit plate 7 on the side of the upper pressure plate 6 is used to limit the upward folding of the outer bag welding edge during the vacuuming process; at this time, the vacuum generating hole works to vacuum the interior after the set time, and the packaging bag has been extended; the lifting assembly 5 drives the vacuum cover 8 to rise to the initial position, the nest box blocking cylinder 27 descends, and the vacuum chamber conveyor belt 1 continues to transport the nest box to the next process.

[0060] See also Figure 5 , 6 , an extending method of a packaging bag extending and aligning device, comprising the following steps;

[0061] Step S1, the vacuum chamber conveyor belt 1 transports the nest box to a suitable position;

[0062] Step S2, the lifting assembly 5 drives the vacuum chamber cover assembly 3 to descend onto the vacuum chamber platform 2, and starts to extend the nest box packaging bag inside;

[0063] Step S3, after the extension is completed, the vacuum chamber conveyor belt 1 transports the nest box to the next process.

[0064] When the vacuum chamber conveying mesh belt 1 transports the nest box to a suitable position, the nest box blocking cylinder 27 will rise to block the nest box from moving forward.

[0065] Step S2 comprises:

[0066] Step S21, the lifting assembly 5 drives the vacuum housing 8 to descend onto the vacuum chamber platform 2, the upper pressing plate 6 presses the top of the nest box, and the upper limit plate 7 on the side of the upper pressing plate 6 is used to limit the outer bag welding edge from folding upward during the vacuuming process;

[0067] Step S22, the vacuum hole is vacuumed for a set time and then stops, and the packaging bag is stretched out;

[0068] Step S23, the lifting assembly 5 drives the vacuum housing 8 to rise to the initial position, the nest box blocking cylinder 27 descends, and the vacuum chamber conveying mesh belt 1 continues to convey the nest box to the next process.

[0069] The packaging bag stretching and alignment device and stretching method change the air volume in the inner outer bag by means of vacuum extraction to stretch the corners of the inner outer packaging bag. In the double-layer outer packaging production process, when the inner outer bag is automatically stretched, both the damage to the packaging material and the contactless transfer of the packaging material, which are two incompatible process problems, are satisfied. The present invention can effectively reduce the manpower investment cost, and the automated production process can ensure the uniformity of each bag rolling, thereby ensuring the effectiveness of the downstream bag cutting.

[0070] Under the premise of ensuring sterility, it can also meet the requirements of contactless packaging material transfer, and then reduce the workload of operators during mass production.

[0071] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A packaging bag extension and alignment device, characterized in that: It comprises a vacuum chamber conveyor mesh belt (1), a vacuum chamber platform (2), a vacuum chamber cover assembly (3), a conveyor mesh belt transmission assembly (4), and a lifting assembly (5) for driving the vacuum chamber cover assembly (3) to perform lifting motion; The vacuum chamber conveyor mesh belt (1) is arranged on the vacuum chamber platform (2), the conveyor mesh belt transmission component (4) is connected to the lower end surface of the vacuum chamber platform (2), and the output end of the conveyor mesh belt transmission component (4) passes through the vacuum chamber platform (2) and is connected to the vacuum chamber conveyor mesh belt (1); the vacuum chamber cover component (3) is arranged above the vacuum chamber platform (2), and the side wall of the vacuum chamber cover component (3) is connected to the lifting component (5); a vacuum pumping device is arranged on the vacuum chamber platform (2), and the extension is completed by vacuuming the packaging bag.

2. The packaging bag extension alignment device according to claim 1, characterized in that: The vacuum chamber cover assembly (3) comprises an upper pressing plate (6), one side of which is connected to an upper limit plate (7); the front and rear of the upper pressing plate (6) are connected to front and rear limit assemblies; the diagonal of the upper pressing plate (6) is connected to a diagonal limit assembly; and the outer side of the upper pressing plate (6) is connected to a vacuum cover (8).

3. The packaging bag extension and alignment device according to claim 1, characterized in that: The conveyor mesh belt transmission assembly (4) comprises a main transmission column (9), a main transmission shaft (13) is arranged inside the main transmission column (9), the main transmission shaft (13) is connected to the vacuum chamber conveyor mesh belt (1), and a sealing assembly is arranged on the outer wall.

4. The packaging bag extension and alignment device according to claim 2, characterized in that: The front and rear limiting components include a limiting frame (20), the limiting frame (20) is rotatably connected to a first screw rod (21), the upper end of the first screw rod (21) passes through the upper pressure plate (6), and the first screw rod (21) is connected to a first fixing nut (22).

5. The packaging bag extension and alignment device according to claim 2, characterized in that: The diagonal limiting assembly comprises a second limiting plate (23), the second limiting plate (23) is rotatably connected to a second screw rod (24), the upper end of the second screw rod (24) passes through the upper pressure plate (6), and the second screw rod (24) is connected to a second fixing nut (25).

6. The packaging bag extension and alignment device according to claim 2, characterized in that: The upper limit plate (7) is connected with a retractable component.

7. The packaging bag extension and alignment device according to claim 1, characterized in that: Mesh belt guardrails (26) are arranged on both sides of the vacuum chamber conveying mesh belt (1), and the mesh belt guardrails (26) are connected to the vacuum chamber platform (2).

8. The packaging bag extension and alignment device according to claim 1, characterized in that: One end of the vacuum chamber conveying mesh belt (1) is provided with a nest-blocking box cylinder (27).

9. The packaging bag extension and alignment device according to claim 1, characterized in that: The vacuum chamber platform (2) is provided with a special joint (28) for threading and sealing.

10. The packaging bag extension and alignment device according to claim 2, characterized in that: The lower port of the vacuum housing (8) is connected to an aluminum alloy base (29).

11. A method for extending a packaging bag extension and alignment device, characterized in that: The steps include: Step S1, the vacuum chamber conveyor belt (1) transports the nest box to a suitable location; Step S2, the lifting assembly (5) drives the vacuum chamber cover assembly (3) to descend to the vacuum chamber platform (2) and starts to extend the nest box packaging bag inside; Step S3, after the extension is completed, the vacuum chamber conveyor belt (1) transports the nest box to the next process.

12. The extending method of the packaging bag extending and aligning device according to claim 11, characterized in that: When the vacuum chamber conveying mesh belt (1) transports the nest box to a suitable position, the nest box blocking cylinder (27) will rise to block the nest box from moving forward.

13. The extending method of the packaging bag extending and aligning device according to claim 11, characterized in that: The step S2 comprises: Step S21, the lifting assembly (5) drives the vacuum cover (8) to descend to the vacuum chamber platform (2), the upper pressing plate (6) presses the top of the nest box, and the upper limit plate (7) on the side of the upper pressing plate (6) is used to limit the outer bag welding edge from folding upward during the vacuuming process; Step S22, the vacuum hole is vacuumed for a set time and then stops, and the packaging bag is stretched out; Step S23, the lifting assembly (5) drives the vacuum cover (8) to rise to the initial position, the nest box blocking cylinder (27) descends, and the vacuum chamber conveying mesh belt (1) continues to convey the nest box to the next process.

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