A packaging bag stretching alignment device and a stretching method

Abstract

The application discloses a packaging bag stretching alignment device, which comprises a vacuum chamber conveying net belt, a vacuum chamber platform, a vacuum chamber cover assembly, a conveying net belt transmission assembly and a lifting assembly; the vacuum chamber conveying net belt is arranged on the vacuum chamber platform; the conveying net belt transmission assembly is connected to the lower end face of the vacuum chamber platform; the output end of the conveying net belt transmission assembly penetrates through the vacuum chamber platform and is connected to the vacuum chamber conveying net belt; the vacuum chamber cover assembly is arranged above the vacuum chamber platform; the side wall of the vacuum chamber cover assembly is connected with the lifting assembly; and the vacuum chamber platform is provided with a vacuumizing hole. The application aims to overcome the existing defects and provide a packaging bag stretching alignment device and a stretching method, so as to effectively reduce the labor cost, realize the automatic production process and guarantee the uniformity of each bag stretching, thereby ensuring the effectiveness of the downstream bag cutting.

Description

TECHNICAL FIELD

[0001] The present application relates to a packaging bag stretching alignment device and a stretching method. BACKGROUND

[0002] The packaging bag stretching alignment device is mainly used in an automatic double-layer bag opening device to automatically arrange the inner packaging bag from the initial folded and curled state, automatically straighten it, and deliver it to a second-layer outer bag cutting unit for inner outer bag cutting.

[0003] There are three methods of automatic outer packaging bag stretching alignment in the market, all of which have certain defects.

[0004] Method 1: mechanical stretching (as shown in Figure 7 The main components include a clamping box conveying assembly (as shown in Figure 7 The main components include a clamping box conveying assembly (as shown in Figure 7 When the nest box (as shown in Figure 7 When the nest box (as shown in Figure 7 When the nest box (as shown in Figure 7 When the nest box (as shown in Figure 7 When the nest box (as shown in Figure 7 When the nest box (as shown in Figure 7 When the nest box (as shown in Figure 7 When the nest box (as shown in Figure 7 When the nest box (as shown in

[0005] When the nest box (as shown in

[0006] Method 2: vacuum chamber stretching (as shown in Figure 8(As shown). It mainly utilizes the principle that the outer packaging bag has a vent, allowing gas to pass through under negative pressure, and performs two vacuum cycles to extend the outer bag. Existing extension methods primarily include a vacuum chamber platform (such as... Figure 8 Component 112 shown), outer bag pull-out component (such as...) Figure 8 The component shown (113) consists of two parts. When the nest box stops at the inlet of the vacuum chamber extension unit, the outer bag pull-out component pulls the nest box onto the vacuum chamber platform. The vacuum chamber cover assembly then descends onto the platform, forming a sealed space and performing two vacuuming operations. After the inner outer bag extends, the vacuum chamber cover assembly rises to its highest position, and the outer bag pull-out component pulls the extended outer bag out to a set position (e.g., ...). Figure 8 The component 115 shown is used to cut off the outer bag, and then the outer bag moves along the Y direction to a set position (e.g., ...). Figure 8 Component 116 shown pushes the box and recycles the outer bag (such as...). Figure 8 Component 117 shown).

[0007] Compared to mechanical stretching, existing vacuum stretching methods cause less damage to the outer packaging bag and provide higher sterility in automated stretching units. However, after the outer bag is cut off, the limited structural space prevents the nest box from being pushed downstream immediately. There is a risk of cross-contamination of the nest box in the opening area of ​​the outer bag, which fails to meet the goal of contactless transfer of nest boxes.

[0008] Method 3: After the first layer of outer bags is semi-automatically removed, the bags are manually straightened and the outer bags of the nest box are attached to the mesh belt guardrail before proceeding downstream for the inner layer of outer bags to be cut off. This method is only suitable for product lines with small batch production scales, and whether the outer bags are straightened properly depends directly on the operator's workload and mood, making it difficult to control the uniformity of the straightening process.

[0009] Therefore, a packaging bag extension and alignment device and extension method are proposed to address the above problems. Summary of the Invention

[0010] The purpose of this invention is to overcome the shortcomings of existing products by providing a packaging bag stretching and alignment device and stretching method, which effectively reduces labor input costs. The automated production process can ensure the uniformity of each bag stretching, thereby ensuring the effectiveness of downstream bag cutting.

[0011] To achieve the above objectives, the present invention provides the following technical solution: a packaging bag extension and alignment device, comprising a vacuum chamber conveyor belt, a vacuum chamber platform, a vacuum chamber cover assembly, a conveyor belt drive assembly, and a lifting assembly;

[0012] 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, the output end of the conveying mesh belt transmission assembly is connected to the vacuum chamber conveying mesh belt through the vacuum chamber platform, the vacuum chamber cover shell assembly is arranged above the vacuum chamber platform, the side wall of the vacuum chamber cover shell assembly is connected with the lifting assembly, and the vacuum chamber platform is provided with a vacuumizing device.

[0013] Preferably, the vacuum chamber cover shell assembly comprises an upper pressing plate, one side of the upper pressing plate is connected with an upper limiting plate, front and rear limiting assemblies are connected to the front and rear of the upper pressing plate, diagonal limiting assemblies are connected to the opposite corners of the upper pressing plate, and the outer side of the upper pressing plate is connected with a vacuum cover shell.

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

[0015] Preferably, the front and rear limiting assemblies comprise a limiting frame, a first screw rod is rotatably connected to the limiting frame, the upper end of the first screw rod penetrates through the upper pressing plate, and a first locking nut is connected to the first screw rod.

[0016] Preferably, the diagonal limiting assemblies comprise a second limiting plate, a second screw rod is rotatably connected to the second limiting plate, the upper end of the second screw rod penetrates through the upper pressing plate, and a second locking nut is connected to the second screw rod.

[0017] Preferably, the upper limiting plate is connected with a telescopic assembly.

[0018] Preferably, mesh belt guardrails are arranged on the two sides of the vacuum chamber conveying mesh belt, and the mesh belt guardrails are connected to the vacuum chamber platform.

[0019] Preferably, a nest box blocking cylinder is arranged at one end of the vacuum chamber conveying mesh belt.

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

[0021] Preferably, an aluminum alloy bottom support is connected to the lower port of the vacuum cover shell.

[0022] A stretching method of a packaging bag stretching alignment device comprises the following steps.

[0023] In step S1, the vacuum chamber conveying mesh belt transports the nest box to a suitable position.

[0024] Step S2, the lifting assembly drives the vacuum chamber cover assembly to descend on the vacuum chamber platform, and the extension of the inner nest box packaging bag begins;

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

[0026] Preferably, when the vacuum chamber conveying mesh belt transports the nest box to the appropriate position, the nest box blocking cylinder rises to block the nest box from continuing to advance.

[0027] The step S2 comprises:

[0028] Step S21, the lifting assembly drives the vacuum cover to descend on the vacuum chamber platform, the upper pressing plate presses the nest box, and the upper limiting plate at the side of the upper pressing plate is used for limiting the upward folding of the welding edge of the outer bag during the vacuumizing process;

[0029] Step S22, after the internal vacuumizing is stopped after a set time, the packaging bag has been extended;

[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 conveying mesh belt continues to transport the nest box to the next process.

[0031] Compared with the prior art, the beneficial effects of the present application are: the packaging bag extension alignment device and the extension method change the air volume in the inner layer outer bag through the vacuumizing mode to extend the edges and corners of the inner layer outer packaging bag; in the double-layer outer bag production process, when the inner layer outer bag is automatically extended, both the damage to the packaging material and the non-contact transfer of the packaging material are satisfied, which are two incompatible process problems, the labor cost can be effectively reduced through the present application, the production process is automated, the uniformity of each time of bag extension can be guaranteed, and thus the effectiveness of the downstream bag cutting can be ensured.

[0032] Under the premise of ensuring sterility, the non-contact packaging material transfer can be satisfied, and then the working intensity of the operator can be reduced in the mass production process. DETAILED DESCRIPTION

[0033] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application together with the embodiments, and do not constitute a limitation on the present application. In the drawings:

[0034] Figure 1 It is a top view of the packaging bag extension alignment device of the present application;

[0035] Figure 2 It is an axonometric view of the packaging bag extension alignment device of the present application;

[0036] Figure 3The internal detail view of the package bag extension alignment device of the present application;

[0037] Figure 4 The detail view of the conveying mesh belt transmission assembly of the present application;

[0038] Figure 5 The schematic view of the extension method of the present application;

[0039] Figure 6 The detailed schematic view of step S2 of the extension method of the present application;

[0040] Figure 7 The schematic view of the prior art;

[0041] Figure 8 The schematic view of the prior art;

[0042] Figure 9 The front view of the nest box outer bag;

[0043] Figure 10 The schematic view of the nest box.

[0044] In the figure: 1, vacuum chamber conveying mesh belt; 2, vacuum chamber platform; 3, vacuum chamber cover assembly; 4, conveying mesh belt transmission assembly; 5, lifting assembly; 6, upper pressing plate; 7, upper limit plate; 8, vacuum cover; 9, main transmission vertical 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, rotary sealing ring; 17, O-ring; 18, first sealing ring limit block; 19, plane bearing; 20, limit frame; 21, first screw; 22, first locking nut; 23, second limit plate; 24, second screw; 25, second locking nut; 26, mesh belt guardrail; 27, nest box blocking air cylinder; 28, threading sealing special joint; 29, aluminum alloy bottom support. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0046] The present application is different from the layout of the existing vacuum extension structure. The old method adopts narrow edge forward transportation (as shown in Figure 10 The nest box direction is as shown in Figure 10The nest box wide side is transported forward, and the vacuum chamber platform 2 is provided with a conveying mesh belt driving assembly 4, and the old method does not have a driving assembly on the vacuum chamber platform, but only stores and stands.

[0047] Please refer to Figures 1-4 A packaging bag extension alignment device comprises a vacuum chamber conveying mesh belt 1, a vacuum chamber platform 2, a vacuum chamber cover assembly 3, a conveying mesh belt driving assembly 4 and a lifting assembly 5. The vacuum chamber conveying mesh belt 1 is arranged on the vacuum chamber platform 2, the conveying mesh belt driving assembly 4 is connected to the lower end surface of the vacuum chamber platform 2, the output end of the conveying mesh belt driving assembly 4 penetrates through the vacuum chamber platform 2 and is connected to the vacuum chamber conveying 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 the vacuum chamber platform 2 is provided with a vacuumizing device, and the extension is completed by vacuumizing the packaging bag.

[0048] Specifically, the vacuum chamber cover assembly 3 comprises an upper pressing plate 6, one side of the upper pressing plate 6 is connected with an upper limiting plate 7, front and rear limiting assemblies are connected to the front and rear of the upper pressing plate 6, diagonal limiting assemblies are connected to the opposite corners of the upper pressing plate 6, and a vacuum cover 8 is connected to the outer side of the upper pressing plate 6.

[0049] Specifically, the lifting assembly 5 drives the vacuum cover 8 to descend onto the vacuum chamber platform 2, the upper pressing plate 6 is pressed against the upper side of the nest box, and the upper limiting plate 7 at the side of the upper pressing plate 6 is used to limit the upward folding of the welding edge of the outer bag during the vacuumizing process.

[0050] Specifically, the front and rear limiting assemblies comprise a limiting frame 20, a first screw rod 21 is rotatably connected to the limiting frame 20, the upper end of the first screw rod 21 penetrates through the upper pressing plate 6, and a first locking nut 22 is connected to the first screw rod 21. By loosening the first locking nut 22, the first screw rod 21 can be rotated, and thus the height of the limiting frame 20 can be adjusted.

[0051] Specifically, the diagonal limiting assemblies comprise a second limiting plate 23, a second screw rod 24 is rotatably connected to the second limiting plate 23, the upper end of the second screw rod 24 penetrates through the upper pressing plate 6, and a second locking nut 25 is connected to the second screw rod 24. By loosening the second locking nut 25, the second screw rod 24 can be rotated, and thus the height of the second limiting plate 23 can be adjusted.

[0052] Specifically, the upper limit plate 7 is connected with a telescopic assembly. The telescopic assembly can be a guide rod and a return spring. The nest box is arranged eccentrically relative to the center plane of the conveying mesh belt, mainly to provide space for the expansion of the welding edge, and the upper limit plate 7 of the welding edge is widened, and a telescopic structure is added to the upper limit plate, which is mainly used for the retraction of the outer bag during the expansion process and the resetting of the outer bag after the air in the outer bag is exhausted. The welding edge is limited, and a silica gel plate is added below the limiting plate, which mainly increases the resistance when the welding edge presses the bag, and the clamping is more reliable, so that the success rate of secondary vacuumizing is higher.

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

[0054] Specifically, in order to ensure the effectiveness and efficiency of vacuumizing, the dynamic and static seals above and below the vacuum chamber bottom plate 10 need to be done well. The bevel gear mounting seat 12 and the mounting seat mounting plate 11 are connected by bolts, the mounting seat mounting plate 11 is bolted to the vacuum chamber bottom plate 10, and the corresponding threaded hole of the vacuum chamber bottom plate 10 is a blind hole, so that the bevel gear mounting related to the outside does not exist leakage; the main transmission column 9 and the vacuum chamber bottom plate 10 adopt static pressure sealing, the side edge of the first sealing ring limiting block 18 and the main transmission column 9 adopt piston static sealing, the main transmission shaft 13 and the second sealing ring limiting block 15 adopt the rotating sealing ring 16, which is suitable for sealing in the radial direction under rotating working condition.

[0055] Specifically, the two sides of the vacuum chamber conveying mesh belt 1 are provided with mesh belt guardrails 26, and the mesh belt guardrails 26 are connected to the vacuum chamber platform 2. The mesh belt guardrail 26 is flatly designed and has a horn mouth, which is convenient for positioning and guiding, so as to ensure the accuracy of the position of the nest box during the expansion process, thereby improving the stability of the equipment.

[0056] Specifically, one end of the vacuum chamber conveying mesh belt 1 is provided with a nest blocking cylinder 27. When the vacuum chamber conveying mesh belt 1 transports the nest to the appropriate position, the nest blocking cylinder 27 will rise to block the nest from continuing to advance.

[0057] Specifically, the vacuum chamber platform 2 is provided with a threading sealing special joint 28. The vacuum chamber platform 2 has a total of five groups of cables that need to pass through the platform and form a seal, including nest position detection sensors, magnetic switches of the blocking cylinder, and air pipes of the nest blocking cylinder. All cables that need to pass through the platform pass through the platform to the surface below through the threading sealing special joint 28 inside the cover, which meets the sealing requirements and wireless function requirements as a whole. After the cover is installed, the daily operation does not need to maintain the space inside the cover.

[0058] Specifically, the lower end of the vacuum cover 8 is connected with an aluminum alloy bottom support 29. The reinforced structure design of the vacuum cover 8 has the aluminum alloy bottom support 29 at the bottom, which avoids the deformation of the cover caused by excessive unit area during the vacuumizing process.

[0059] Specifically, when the vacuum chamber conveying mesh belt 1 transports the nest to the appropriate position, the nest blocking cylinder 27 will rise to block the nest from continuing to advance; then the lifting assembly 5 drives the vacuum cover 8 to descend to the vacuum chamber platform 2, the upper pressing plate 6 presses the nest from above, and the upper limiting plate 7 at the side of the upper pressing plate 6 is used to limit the upward folding of the welding edge of the outer bag during the vacuumizing process; at this time, the internal vacuumizing hole works to stop after a set time, and at this time, the packaging bag has been stretched out; the lifting assembly 5 drives the vacuum cover 8 to rise to the initial position, the nest blocking cylinder 27 descends, and the vacuum chamber conveying mesh belt 1 continues to transport the nest to the next process.

[0060] Please refer to Figure 5 、 6 A stretching method of the packaging bag stretching alignment device, comprising the following steps:

[0061] Step S1, the vacuum chamber conveying mesh belt 1 transports the nest to the appropriate position;

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

[0063] Step S3, after the stretching is completed, the vacuum chamber conveying mesh belt 1 transports the nest to the next process.

[0064] When the vacuum chamber conveying mesh belt 1 transports the nest to the appropriate position, the nest blocking cylinder 27 will rise to block the nest from continuing to advance.

[0065] Step S2 includes;

[0066] Step S21, the lifting assembly 5 drives the vacuum shell 8 to descend to the vacuum chamber platform 2, the upper pressing plate 6 is pressed tightly above the nest box, and the upper limiting plate 7 at the side of the upper pressing plate 6 is used for limiting the upward folding of the welding edge of the outer bag during the vacuumizing process;

[0067] Step S22, at this time, the internal vacuumizing hole works, and after the internal vacuumizing is stopped after a set time, the packaging bag has been extended and opened;

[0068] Step S23, the lifting assembly 5 drives the vacuum shell 8 to ascend 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 extension alignment device and the extension method change the air volume in the inner layer outer bag by the vacuumizing mode, and extend the edges and corners of the inner layer outer packaging bag; in the double-layer outer bag production process, when the inner layer outer bag is automatically extended, the two incompatible process problems of small damage to the packaging material and non-contact transfer of the packaging material are met, the labor cost can be effectively reduced by the application, the automatic production process can guarantee the uniformity of each time, and thus the effectiveness of the downstream cutting bag is ensured.

[0070] Under the premise of ensuring sterility, the non-contact packaging material transfer can be met, and then the working strength of the operator is reduced in the mass production process.

[0071] Finally, it should be noted that: the above is only the preferred embodiment of the application, and is not used to limit the application, although the application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A packaging bag extension and alignment device, characterized in that, It includes a vacuum chamber conveyor belt (1), a vacuum chamber platform (2), a vacuum chamber housing assembly (3), a conveyor belt drive assembly (4), and a lifting assembly (5) that drives the vacuum chamber housing assembly (3) to move up and down. The vacuum chamber conveyor belt (1) is set on the vacuum chamber platform (2), the conveyor belt drive assembly (4) is connected to the lower end face of the vacuum chamber platform (2), and the output end of the conveyor belt drive assembly (4) passes through the vacuum chamber platform (2) and connects to the vacuum chamber conveyor belt (1); the vacuum chamber cover assembly (3) is set above the vacuum chamber platform (2), the side wall of the vacuum chamber cover assembly (3) is connected to the lifting assembly (5), and the vacuum chamber platform (2) is equipped with a vacuum pumping device to complete the extension by vacuuming the packaging bag; The conveyor belt drive assembly (4) includes a main drive column (9), a main drive shaft (13) is installed inside the main drive column (9), the main drive shaft (13) is connected to the conveyor belt (1) of the vacuum chamber, and a sealing assembly is installed on the outer wall. The sealing assembly includes a second sealing ring limiting block (15), an O-ring (17) and a first sealing ring limiting block (18); the upper end of the main drive column (9) is connected to the bottom plate (10) of the vacuum chamber, the upper end of the bottom plate (10) is connected to the mounting plate (11) of the mounting seat, and the upper end of the mounting plate (11) is connected to the bevel gear mounting seat (12); the main drive column (9) The main drive shaft (13) is provided inside the main drive shaft (13). A first bearing (14) is provided between the main drive shaft (13) and the main drive column (9). A second sealing ring limiting block (15) is provided above the first bearing (14). A rotating sealing ring (16) is provided above the second sealing ring limiting block (15). An O-ring (17) is provided above the rotating sealing ring (16). A first sealing ring limiting block (18) is provided above the O-ring (17). A plane bearing (19) is provided on the first sealing ring limiting block (18). The upper end of the main drive column (9) is connected to the vacuum chamber conveyor belt (1). The lifting assembly (5) drives the vacuum chamber cover assembly (3) to descend onto the vacuum chamber platform (2).

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

3. 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), on which a first screw (21) is rotatably connected. The upper end of the first screw (21) passes through the upper pressure plate (6), and a first set nut (22) is connected to the first screw (21).

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

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

6. The packaging bag extension and alignment device according to claim 1, characterized in that, The vacuum chamber conveyor belt (1) is provided with belt guardrails (26) on both sides, and the belt guardrails (26) are connected to the vacuum chamber platform (2).

7. The packaging bag extension and alignment device according to claim 1, characterized in that, A nest-blocking cylinder (27) is provided at one end of the vacuum chamber conveyor belt (1).

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

9. 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).

10. An extension method based on the packaging bag extension alignment device of claim 7, characterized in that, Includes the following steps; Step S1, the vacuum chamber conveyor belt (1) transports the nest box to the appropriate position; In step S2, the lifting component (5) drives the vacuum chamber cover component (3) down onto the vacuum chamber platform (2) to begin extending the internal nest box packaging bag; Step S3, after the extension is completed, the vacuum chamber conveyor belt (1) transports the nest box to the next process.

11. The extension method of the packaging bag extension alignment device according to claim 10, characterized in that, When the vacuum chamber conveyor belt (1) transports the nest box to the appropriate position, the nest box blocking cylinder (27) will rise to prevent the nest box from moving forward.

12. The extension method of the packaging bag extension alignment device according to claim 10, characterized in that, Step S2 includes: Step S21, the lifting assembly (5) drives the vacuum cover (8) down to the vacuum chamber platform (2), the upper pressure plate (6) presses against the top of the nest box, and the upper limit plate (7) on the side of the upper pressure plate (6) is used to restrict the outer bag welding edge from folding upward during the vacuuming process; Step S22: At this time, the vacuum generating hole works to evacuate the inside for a set time and then stops. At this time, the packaging bag has been extended. In step S23, the lifting assembly (5) drives the vacuum cover (8) to rise to the initial position, the nest box cylinder (27) descends, and the vacuum chamber conveyor belt (1) continues to transport the nest box to the next process.

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