A bagging device and method

Abstract

The application relates to the packaging technical field, and particularly discloses a bagging device and method, which comprises a rack, a first adsorption mechanism, a bag expanding moving mechanism, a bag expanding mechanism, a bagging cylinder, a second adsorption mechanism and a control unit. The rack is provided with a bagging roll and a guide roller. The guide roller is used for guiding the packaging bag at the end of the bagging roll into the bagging cylinder. The first adsorption mechanism is used for realizing the separation and opening of the packaging bag. The bag expanding moving mechanism is used for driving the bag expanding mechanism to move up and down. The bag expanding mechanism is coaxially arranged with the bagging cylinder. The bag expanding mechanism expands the packaging bag by moving downwards and makes the open end of the packaging bag roll up on the top of the bagging cylinder. The bagging cylinder is a cylindrical structure with open ends at the top and bottom. The second adsorption mechanism is used for adsorbing and fixing the packaging bag after the edge is rolled. The control unit is used for controlling the actions of the first adsorption mechanism, the bag expanding moving mechanism and the second adsorption mechanism. The application can realize automatic bagging and automatic bag arranging, and is beneficial to subsequent mouth binding treatment.

Description

Technical Field

[0001] This invention relates to the field of packaging technology, and specifically to a bagging device and method. Background Technology

[0002] Packaging typically refers to the processes preceding the overall packaging of a product. It involves placing the produced sample into a packaging bag or box and then sealing it. The process of placing the product into the packaging bag is called bagging.

[0003] Existing bagging methods mainly include manual and mechanical bagging. Manual bagging has been gradually phased out due to its low efficiency. Existing mechanical bagging mainly uses an adsorption plate to open the bag, and then a robotic arm grabs the product and puts it into the packaging bag. After the product is put into the packaging bag, it does not have an automatic bag sorting function, which is not conducive to the subsequent automatic sealing operation.

[0004] Therefore, it is necessary to design a bagging device with automatic bag-sorting function. Summary of the Invention

[0005] The purpose of this invention is to provide a bagging device and method that can not only automatically bag but also automatically sort the bags, which facilitates subsequent sealing.

[0006] This invention is achieved through the following technical solution:

[0007] A bagging device includes a frame, a first adsorption mechanism, a bag-expanding moving mechanism, a bag-expanding mechanism, a bag-covering cylinder, a second adsorption mechanism, and a control unit;

[0008] The frame is equipped with a bagging roll and a guide roller. The guide roller is used to guide the packaging bag at the end of the bagging roll into the bagging tube, and the open end of the packaging bag protrudes out of the bagging tube.

[0009] The first adsorption mechanism is used to separate and open the packaging bag;

[0010] The expansion sleeve moving mechanism is used to drive the expansion sleeve mechanism to move up and down;

[0011] The expanding sleeve mechanism is connected to the expanding sleeve moving mechanism and is coaxially arranged with the bag sleeve tube. The expanding sleeve mechanism expands the packaging bag by moving downward and causes the open end of the packaging bag to roll up to the top of the bag sleeve tube.

[0012] The bag sleeve is a cylindrical structure with open ends at both the top and bottom;

[0013] The second adsorption mechanism is used to adsorb and fix the rolled-up packaging bag;

[0014] The control unit is used to control the operation of the first adsorption mechanism, the expansion sleeve moving mechanism, and the second adsorption mechanism.

[0015] In this invention, the first adsorption mechanism, the expansion sleeve moving mechanism, the expansion sleeve mechanism, the bag sleeve cylinder, and the second adsorption mechanism are all installed on the bagging device. The guide roller rotates during use via a motor drive.

[0016] The first adsorption mechanism of the present invention can adopt an existing vacuum adsorption disk structure, and the adsorption force is used to separate and open the packaging bag.

[0017] This invention, by setting up a mutually cooperating expanding sleeve moving mechanism, expanding sleeve mechanism, and bag sleeve tube, can not only realize automatic bagging, but also the bag sleeve tube has a certain height. When the packaging bag is adsorbed onto the bag sleeve tube by the second adsorption mechanism, the product can be directly put into the packaging bag. When the second adsorption mechanism stops adsorption, the packaging bag containing the product moves downward along its inner wall inside the bag sleeve tube. The bag sleeve tube has a limiting function, realizing bag sorting at the same time as bagging.

[0018] Furthermore, the first adsorption mechanism includes a first suction cup and a second suction cup. The first and second suction cups are symmetrically arranged with the central axis of the bag sleeve as the center line. The first and second suction cups are located on the outer side above the bag sleeve, and the first suction cup is located below the guide roller. The first and second suction cups are communicatively connected to the control unit. The control unit controls the first and second suction cups to adsorb the two sides of the opening of the packaging bag in sequence, so as to separate and open the packaging bag.

[0019] The first suction cup first adsorbs one side of the packaging bag to fix the packaging bag inside the bag sleeve. The fixed packaging bag is then adsorbed by the second suction cup to open the packaging bag. Under the adsorption force of the first and then the second suction cup, the packaging bag placed inside the bag sleeve can be separated from the bag sleeve roll.

[0020] Furthermore, the expansion joint moving mechanism includes a first telescopic component, a crossbar, and a second telescopic component;

[0021] The extension stroke of the first telescopic component is greater than that of the second telescopic component. The bottom of the first telescopic component is fixed to the frame, and the top of the first telescopic component is connected to the second telescopic component via a crossbar.

[0022] This invention controls the vertical displacement of the expanding sleeve mechanism by adjusting the vertical displacement of the first and second telescopic members, allowing it to enter or exit the bag sleeve. The extension stroke of the first telescopic member is greater than that of the second telescopic member to better and more precisely control the vertical displacement of the expanding sleeve mechanism. The first telescopic member is used for large-stroke adjustment, and the second telescopic member is used for small-stroke adjustment. Both the first and second telescopic members can specifically be hydraulic cylinders.

[0023] Furthermore, the expansion mechanism includes a cylinder and a contraction assembly;

[0024] The shrinking assembly includes a first shrinking ring and a second shrinking ring arranged coaxially; the first shrinking ring is coaxially arranged on the outside of the cylinder, and the second shrinking ring is coaxially arranged on the inside of the cylinder; the first shrinking ring and the second shrinking ring are connected by a plurality of radial shrinking rods.

[0025] Both the first and second contraction rings can contract circumferentially, and the radial contraction rod can contract radially.

[0026] The cylinder is also provided with a conical part for expanding the shrink assembly; when the shrink assembly is not subjected to external force, the first shrink ring is placed inside the packaging bag. When the conical part moves downward to expand the shrink assembly, the outer diameter of the first shrink ring expands, pushing the opening end of the packaging bag out of the sleeve cylinder. Then, through the expansion sleeve mechanism, it moves downward to make the first shrink ring squeeze the packaging bag downward to complete the edge rolling operation.

[0027] This invention enables the packaging bag to be rolled up at the top of the sleeve tube by controlling the shrinking component and coordinating the vertical displacement of the expanding sleeve mechanism.

[0028] Furthermore, a drive mechanism for driving the conical component to move up and down is provided inside the cylinder.

[0029] Furthermore, the first contraction ring includes multiple arc-shaped segments, with adjacent arc-shaped segments connected by elastic elements, forming a circular structure composed of multiple arc-shaped segments and multiple elastic elements. The second contraction ring has the same structure as the first contraction ring. That is, the present invention utilizes the change in the outer diameter of a tapered component to achieve radial contraction of the contraction assembly, with the outer diameter of the tapered component gradually decreasing from top to bottom.

[0030] Furthermore, the radial shrinkage rod includes at least two connecting rods, with adjacent connecting rods connected by an elastic element, and the two connecting rods at both ends connected to the first shrinkage ring and the second shrinkage ring, respectively.

[0031] Furthermore, it also includes a receiving tube, a vertical lifting mechanism, and a horizontal conveying mechanism;

[0032] The receiving tube is fixed on the frame, the receiving tube is located below the bag-covering tube and above the horizontal conveying mechanism, and is used to receive packaging bags containing products.

[0033] The telescopic end of the vertical lifting mechanism is provided with a receiving plate, which can move up and down inside the receiving cylinder and is used to support the packaging bag.

[0034] The horizontal conveying mechanism is used to remove the packaging bags from the receiving tray and transport them to the next workstation.

[0035] This invention, through the inclusion of a receiving tube, a vertical lifting mechanism, and a horizontal conveying mechanism, enables the automatic export of bagged products from the bagging device.

[0036] Furthermore, the second adsorption mechanism includes two fixed suction cups arranged symmetrically.

[0037] The bagging method based on the above-mentioned bagging device includes the following steps:

[0038] S1. The bagging roll is conveyed to the guide roller by the conveying mechanism on the frame, and the packaging bag at the end of the bagging roll is guided into the bagging cylinder by the guide roller.

[0039] S2. The control unit controls the activation of the first adsorption mechanism to separate and open the packaging bag;

[0040] S3. The control unit controls the expansion sleeve moving mechanism to move the expansion sleeve mechanism downward into the packaging bag, and continues to move downward to open the packaging bag, and rolls the open end of the packaging bag onto the upper end of the bag sleeve tube.

[0041] S4. The control unit controls the second adsorption mechanism to adsorb the rolled-up packaging bag and controls the expansion sleeve moving mechanism to move the expansion sleeve upward to remove the packaging bag, and the robot arm puts the product into the packaging bag.

[0042] S5. The control unit controls the second adsorption mechanism to stop adsorption. Under the action of product gravity, the packaging bag moves downward along the inner wall of the bag sleeve to complete the bagging and sorting.

[0043] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0044] The present invention installs a first adsorption mechanism, a sleeve-expanding moving mechanism, a sleeve-expanding mechanism, a bag-covering cylinder, a second adsorption mechanism, and a control unit on a frame. It can automatically realize the conveying of empty packaging bags, the separation and opening of packaging bags, the adsorption and fixation of packaging bags on the bag-covering cylinder after the packaging bags are rolled up, the product bag being put in, and the bag sorting. That is, the present invention can not only realize automatic bagging, but also automatic bag sorting, which is conducive to subsequent sealing processing. Attached Figure Description

[0045] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0046] Figure 1 This is a schematic diagram of the overall structure of the bagging device of the present invention;

[0047] Figure 2 This is a schematic diagram of the expansion sleeve mechanism of the present invention;

[0048] Figure 3 This is a schematic diagram of the structure of the shrinkage component of the present invention.

[0049] The attached diagram shows the markings and corresponding component names:

[0050] 1-Frame; 2-Expansion sleeve moving mechanism; 3-Expansion sleeve mechanism; 4-Bag sleeve cylinder; 5-Fixed suction cup; 6-Receiving cylinder; 7-Vertical lifting mechanism; 8-First suction cup; 9-Guide roller; 10-Second suction cup; 11-Bag roll; 12-Horizontal conveying mechanism; 13-Conical component; 21-First telescopic component; 22-Crossbar; 23-Second telescopic component; 31-Cylinder body; 32-Shrinking assembly; 321-First shrinking ring; 322-Radial shrinking rod; 323-Second shrinking ring; 100-Packaging bag. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0052] Example 1:

[0053] like Figures 1-3 As shown, a bagging device includes a frame 1, a first adsorption mechanism, a bagging moving mechanism 2, a bagging mechanism 3, a bagging cylinder 4, a second adsorption mechanism, and a control unit.

[0054] The first adsorption mechanism, the expansion sleeve moving mechanism 2, the expansion sleeve mechanism 3, the bag sleeve cylinder 4, and the second adsorption mechanism are all mounted on the frame 1. The frame 1 includes a horizontal base frame with multiple uprights on it, and a top frame is mounted on the top of each upright. The bag sleeve cylinder 4 is positioned between the uprights and has a gap between it and both the horizontal base frame and the top frame. The first adsorption mechanism and the second adsorption mechanism are both mounted on the uprights and are positioned outside the bag sleeve cylinder 4. Furthermore, the first adsorption mechanism is positioned higher than the bag sleeve cylinder 4, and the second adsorption mechanism is positioned at a corresponding position on the top of the bag sleeve cylinder 4.

[0055] A bag roll 11 and a guide roller 9 are installed on the frame 1. The guide roller 9 is used to guide the packaging bag 100 at the end of the bag roll 11 into the bag cylinder 4, and the open end of the packaging bag 100 protrudes from the bag cylinder 4. Specifically, a rotating shaft is provided on the horizontal base of the frame 1. The bag roll 11 is wound on the rotating shaft. The bag roll 11 is composed of several packaging bags 100 connected together. The packaging bags 100 have an easy-tear structure between adjacent packaging bags 100. In use, a conveying mechanism composed of multiple conveying rollers is also provided on the machine 1. The tension of the conveying mechanism conveys the packaging bag 100 to the guide roller 9. The guide roller 9 is located on the top of the top frame, and there is a gap between the tops of the guide rollers 9. This gap is used to allow the packaging bag 100 to pass through. The guide roller 9 rotates under the drive of the drive mechanism. Under the conveying action of the conveying mechanism and the transmission action of the guide roller 9, the packaging bag 100 is conveyed into the bag cylinder 4.

[0056] The first adsorption mechanism is used to separate and open the packaging bag 100. When the packaging bag 100 is vertically inserted into the bag sleeve 4, and the open end of the packaging bag 100 protrudes from the bag sleeve 4, the control unit controls the first adsorption mechanism to open and adsorb the open end of the packaging bag 100. At this time, the subsequent packaging bags 100 will accumulate slightly between the guide roller 9 and the bag sleeve 4. After the packaging bags 100 in the bag sleeve 4 are bagged, they fall down. The subsequent packaging bags 100 enter the bag sleeve 4 under the pushing action of the bag roll 11 for bagging.

[0057] Specifically, the first adsorption mechanism includes a first suction cup 8 and a second suction cup 10. The first suction cup 8 and the second suction cup 10 are symmetrically arranged with the central axis of the bag sleeve 4 as the center line. The first suction cup 8 and the second suction cup 10 are located on the outer side above the bag sleeve 4, and the first suction cup 8 is located below the guide roller 9. The first suction cup 8 and the second suction cup 10 are communicatively connected to the control unit. The control unit controls the first suction cup 8 and the second suction cup 10 to adsorb the two sides of the opening of the packaging bag 100 in turn, so as to separate and open the packaging bag 100.

[0058] The packaging bag 100 is first attracted to one side by the first suction cup 8. The purpose is to first attract and fix the packaging bag 100 introduced into the bag sleeve 4. The fixed packaging bag 100 is then attracted by the second suction cup 10, which can open the packaging bag 100. Under the attraction of the first suction cup 8 and then the second suction cup 10, the packaging bag 100 placed in the bag sleeve 4 can be separated from the bag roll 11.

[0059] The expanding sleeve moving mechanism 2 is used to drive the expanding sleeve mechanism 3 to move up and down; one specific structure of the expanding sleeve moving mechanism 2 is as follows:

[0060] The expansion sleeve moving mechanism 2 includes a first telescopic component 21, a crossbar 22, and a second telescopic component 23;

[0061] The extension stroke of the first telescopic member 21 is greater than that of the second telescopic member 23. The bottom of the first telescopic member 21 is fixed on the frame 1, specifically on a horizontal base frame. The top of the first telescopic member 21 is connected to the second telescopic member 23 via a crossbar 22. Both the first telescopic member 21 and the second telescopic member 23 can be hydraulic cylinders.

[0062] The expanding sleeve mechanism 3 is connected to the expanding sleeve moving mechanism 2 and is coaxially arranged with the bag sleeve cylinder 4. The expanding sleeve mechanism 3 expands the packaging bag 100 by moving downwards and causes the open end of the packaging bag 100 to roll up onto the top of the bag sleeve cylinder 4. One specific structure of the expanding sleeve mechanism 3 is as follows:

[0063] The expansion mechanism 3 includes a cylinder 31 and a contraction assembly 32;

[0064] The shrinking assembly 32 includes a first shrinking ring 321 and a second shrinking ring 323 arranged coaxially; the first shrinking ring 321 is coaxially arranged on the outside of the cylinder 31, and the second shrinking ring 323 is coaxially arranged on the inside of the cylinder 31; the first shrinking ring 321 and the second shrinking ring 323 are connected by a plurality of radial shrinking rods 322.

[0065] Both the first contraction ring 321 and the second contraction ring 323 can contract circumferentially, and the radial contraction rod 322 can contract radially.

[0066] The cylindrical body 31 is also provided with a conical member 13 for expanding the shrinking assembly 32. When the shrinking assembly 32 is not subjected to external force, the first shrinking ring 321 is placed inside the packaging bag 100. When the conical member 13 moves downward to expand the shrinking assembly 32, the outer diameter of the first shrinking ring 321 expands, pushing the open end of the packaging bag 100 out of the bag sleeve 4, and then the packaging bag 100 is rolled up by the expansion sleeve mechanism 3 moving downward. In this embodiment, the shrinking assembly 32 is expanded radially by the change in the outer diameter of the conical member 13, and the outer diameter of the conical member 13 gradually decreases from top to bottom.

[0067] Specifically, the first contraction ring 321 includes multiple arc-shaped segments, which are connected by elastic elements. The multiple arc-shaped segments and multiple elastic elements form a circular structure. The second contraction ring 323 has the same structure as the first contraction ring 321. The radial contraction rod 322 includes at least two connecting rods, which are connected by elastic elements. The two connecting rods at both ends are connected to the first contraction ring 321 and the second contraction ring 323, respectively. The elastic element can be a spring. A through hole for the connecting rod to pass through is provided on the side wall of the cylinder 31.

[0068] Specifically, a drive mechanism for driving the conical member 13 to move up and down is provided inside the cylinder 31.

[0069] The bag sleeve 4 is a cylindrical structure with open ends at both the top and bottom.

[0070] The second adsorption mechanism is used to adsorb and fix the rolled-up packaging bag 100; one specific structure of the second adsorption mechanism is as follows:

[0071] The second adsorption mechanism includes two symmetrically arranged fixed suction cups 5

[0072] The control unit is used to control the operation of the first adsorption mechanism, the expansion sleeve moving mechanism 2, and the second adsorption mechanism. The control unit includes at least a controller for control.

[0073] In practical implementation, in order to facilitate the export of the bagged products, a receiving tube 6, a vertical lifting mechanism 7, and a horizontal conveying mechanism 12 are also included.

[0074] The receiving cylinder 6 is fixed on the frame 1, positioned below the bagging cylinder 4 and above the horizontal conveying mechanism 12, and is used to receive the packaging bags 100 containing the products; the receiving cylinder 6 also has a guiding and limiting function. The telescopic end of the vertical lifting mechanism 7 is equipped with a receiving plate, which can move up and down within the receiving cylinder 6. The receiving plate supports the packaging bags 100. The vertical lifting mechanism 7 controls the raising and lowering of the receiving plate. When the receiving plate rises into the receiving cylinder 6, the falling products land directly on the receiving plate. Then, the receiving plate moves down to the same height as the horizontal conveying mechanism 12, and the products are removed under the action of the horizontal conveying mechanism 12. In other words, the horizontal conveying mechanism 12 is used to remove the packaging bags 100 from the receiving plate and transport them to the next workstation; the vertical lifting mechanism 7 can be a hydraulic cylinder, and the horizontal conveying mechanism 12 can be a conveyor belt structure.

[0075] This embodiment, by installing a first adsorption mechanism, a sleeve-expanding moving mechanism 2, a sleeve-expanding mechanism 3, a bag-covering cylinder 4, a second adsorption mechanism, and a control unit on the frame 1, can automatically realize the conveying of empty packaging bags 100, the separation and opening of packaging bags 100, the adsorption and fixation of packaging bags 100 on the bag-covering cylinder 4 after the packaging bags 100 are rolled up, the product bagging, and the bag sorting. That is, this embodiment can not only realize automatic bagging, but also automatic bag sorting, which is conducive to subsequent sealing processing.

[0076] The bagging method based on the bagging device described in this embodiment includes the following steps:

[0077] S1. The bag roll 11 is conveyed to the guide roller 9 by the conveying mechanism on the frame 1, and the packaging bag 100 at the end of the bag roll 11 is guided into the bag tube 4 by the guide roller 9.

[0078] S2. Before the packaging bag 100 is completely inside the bag sleeve 4, i.e., when the open end of the packaging bag 100 protrudes from the bag sleeve 4, the control unit controls the activation of the first suction mechanism to separate and open the packaging bag 100. Specifically, the control unit first controls the activation of the first suction cup 8; the first suction cup 8 first adsorbs one side of the packaging bag 100, and then the control unit first controls the activation of the second suction cup 10 to open the packaging bag 100. Under the adsorption force of the first suction cup 8 and then the second suction cup 10, the packaging bag 100 placed in the bag sleeve 4 can be separated from the bag roll 11.

[0079] S3. The control unit controls the expansion sleeve moving mechanism 2 to move the expansion sleeve mechanism 3 downward into the packaging bag 100, and continues to move downward to open the packaging bag 100, and roll the open end of the packaging bag 100 onto the upper end of the bag sleeve 4; specifically, when the expansion sleeve mechanism 3 moves downward to the first shrink ring 321 being placed inside the open end of the packaging bag 100, the conical part 13 is controlled to move downward to open the second shrink ring 323, and then pushes the radial shrink rod 322 to open the first shrink ring 321, so that the outer diameter of the first shrink ring 321 is greater than the outer diameter of the bag sleeve 4, and then the expansion sleeve mechanism 3 is controlled to continue to move downward, so that the packaging bag 100 is rolled up at the top open end of the bag sleeve 4.

[0080] S4. The control unit controls the second adsorption mechanism to adsorb the rolled-up packaging bag 100, and controls the expansion sleeve moving mechanism 2 to move the expansion sleeve mechanism 3 upward to remove the packaging bag 100, and the robot arm puts the product into the packaging bag 100.

[0081] S5. The control unit controls the second adsorption mechanism to stop adsorption. Under the action of product gravity, the packaging bag 100 moves downward along the inner wall of the bag sleeve 4 to complete the bagging and bag sorting.

[0082] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0083] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the disclosed technical content. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

Claims

1. A bagging device, characterized in that, It includes a frame (1), a first adsorption mechanism, a sleeve moving mechanism (2), a sleeve expanding mechanism (3), a sleeve sleeve cylinder (4), a second adsorption mechanism, and a control unit; The frame (1) is equipped with a bag roll (11) and a guide roller (9). The guide roller (9) is used to guide the packaging bag (100) at the end of the bag roll (11) into the bag tube (4), and the open end of the packaging bag (100) protrudes out of the bag tube (4). The first adsorption mechanism is used to separate and open the packaging bag (100); The expansion sleeve moving mechanism (2) is used to drive the expansion sleeve mechanism (3) to move up and down; The expanding sleeve mechanism (3) is connected to the expanding sleeve moving mechanism (2) and is coaxially arranged with the bag sleeve cylinder (4). The expanding sleeve mechanism (3) expands the packaging bag (100) by moving downward and makes the open end of the packaging bag (100) roll up to the top of the bag sleeve cylinder (4). The bag tube (4) is a cylindrical structure with open ends at both the top and bottom; The second adsorption mechanism is used to adsorb and fix the rolled-up packaging bag (100); The control unit is used to control the operation of the first adsorption mechanism, the expansion sleeve moving mechanism (2), and the second adsorption mechanism; The expansion mechanism (3) includes a cylinder (31) and a contraction assembly (32); The shrinking assembly (32) includes a first shrinking ring (321) and a second shrinking ring (323) arranged coaxially; the first shrinking ring (321) is coaxially arranged on the outside of the cylinder (31), and the second shrinking ring (323) is coaxially arranged on the inside of the cylinder (31); the first shrinking ring (321) and the second shrinking ring (323) are connected by a plurality of radial shrinking rods (322); Both the first contraction ring (321) and the second contraction ring (323) can contract circumferentially, and the radial contraction rod (322) can contract radially; The cylinder (31) is also provided with a conical part (13) for expanding the shrinking assembly (32); when the shrinking assembly (32) is not subjected to external force, the first shrinking ring (321) is placed inside the packaging bag (100). When the conical part (13) moves downward to expand the shrinking assembly (32), the outer diameter of the first shrinking ring (321) expands, pushing the opening end of the packaging bag (100) out of the bag sleeve (4).

2. The bagging device according to claim 1, characterized in that, The first adsorption mechanism includes a first suction cup (8) and a second suction cup (10). The first suction cup (8) and the second suction cup (10) are symmetrically arranged with the central axis of the bag sleeve (4) as the center line. The first suction cup (8) and the second suction cup (10) are located on the outer side above the bag sleeve (4), and the first suction cup (8) is located below the guide roller (9). The first suction cup (8) and the second suction cup (10) are communicatively connected to the control unit. The control unit controls the first suction cup (8) and the second suction cup (10) to adsorb the two sides of the opening of the packaging bag (100) in turn, so that the packaging bag (100) separates and opens.

3. The bagging device according to claim 1, characterized in that, The expansion sleeve moving mechanism (2) includes a first telescopic component (21), a crossbar (22), and a second telescopic component (23); The extension stroke of the first telescopic member (21) is greater than that of the second telescopic member (23). The bottom of the first telescopic member (21) is fixed on the frame (1), and the top of the first telescopic member (21) is connected to the second telescopic member (23) through a crossbar (22).

4. The bagging device according to claim 1, characterized in that, The cylinder (31) is provided with a drive mechanism for driving the conical part (13) to move up and down.

5. A bagging device according to claim 1, characterized in that, The first contraction ring (321) includes multiple arc segments, and adjacent arc segments are connected by elastic elements. The multiple arc segments and multiple elastic elements form a circular structure. The second contraction ring (323) has the same structure as the first contraction ring (321).

6. A bagging device according to claim 1, characterized in that, The radial contraction rod (322) includes at least two connecting rods, with adjacent connecting rods connected by an elastic element, and the two connecting rods at both ends are respectively connected to the first contraction ring (321) and the second contraction ring (323).

7. A bagging device according to claim 1, characterized in that, It also includes a receiving tube (6), a vertical lifting mechanism (7), and a horizontal conveying mechanism (12); The receiving tube (6) is fixed on the frame (1), the receiving tube (6) is located below the bag sleeve (4), and the receiving tube (6) is located above the horizontal conveying mechanism (12) for receiving the packaging bag (100) containing the product. The vertical lifting mechanism (7) is provided with a receiving plate at its telescopic end. The receiving plate can move up and down inside the receiving cylinder (6) and is used to support the packaging bag (100). The horizontal conveying mechanism (12) is used to remove the packaging bag (100) from the receiving tray and convey it to the next work station.

8. A bagging device according to any one of claims 1-7, characterized in that, The second adsorption mechanism includes two symmetrically arranged fixed suction cups (5).

9. A bagging method based on the bagging device according to any one of claims 1-8, characterized in that, Includes the following steps: S1. The bag roll (11) is conveyed to the guide roller (9) by the conveying mechanism on the frame (1), and the packaging bag (100) at the end of the bag roll (11) is guided into the bag tube (4) by the guide roller (9); S2. The control unit controls the opening of the first adsorption mechanism to separate and open the packaging bag (100); S3. The control unit controls the expansion sleeve moving mechanism (2) to move the expansion sleeve mechanism (3) downward into the packaging bag (100), and continues to move downward to open the packaging bag (100), and roll the open end of the packaging bag (100) onto the upper end of the bag sleeve cylinder (4); S4. The control unit controls the second adsorption mechanism to adsorb the rolled-up packaging bag (100) and controls the expansion sleeve moving mechanism (2) to move the expansion sleeve mechanism (3) upward to remove the packaging bag (100), and the robot arm puts the product into the packaging bag (100). S5. The control unit controls the second adsorption mechanism to stop adsorption. Under the action of product gravity, the packaging bag (100) moves downward along the inner wall of the bag sleeve (4) to complete the bagging and bag sorting.

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