Bag opening forming mechanism and automatic forming and bag removing device and method

Abstract

The invention discloses a bag opening forming mechanism and an automatic forming and bag removing device and method.The bag opening forming mechanism comprises at least two control sets, each control set comprises at least two control pieces, and each control piece can be in linkage with a control area on the outer ring face of a bag opening; when the control elements are in the first posture, each control element is arranged beside the corresponding control area; in the second posture, the control element is distributed in a regular pattern; when the control parts are in the third posture, the distance between every two adjacent control parts is smaller than the distance between every two adjacent control parts in the second posture. The control piece of the bag opening forming mechanism is controlled to be switched among the first posture, the second posture and the third posture, the control piece is matched with the inserting piece to work, automatic forming and closing-up of the M edge of the bag opening can be achieved, the automation degree is high, and the manual dependence is reduced.

Description

Technical Field

[0001] This invention belongs to the field of automation equipment technology, specifically relating to a bag opening forming mechanism, an automated forming and unpacking device and method. Background Technology

[0002] Existing packaging bags typically have a straight or M-shaped opening during packaging. However, current automated packaging equipment can only handle straight-shaped openings and cannot be applied to M-shaped openings. Currently, the packaging process for M-shaped opening bags relies entirely on manual folding and alignment of the M-sides after packaging before sending the bag to the subsequent weight reduction and sealing station. This process is highly manual, complex, and poses safety hazards. Summary of the Invention

[0003] The purpose of this application is to provide a bag opening forming mechanism, a bag opening forming and unpacking device and method to solve the technical problems in the prior art where the entire packaging process requires manual operation, has high dependence on manual labor, is complex to operate, and poses safety hazards.

[0004] To achieve the above objectives, the first aspect of this application provides a bag opening forming mechanism, comprising:

[0005] At least two control groups are respectively located on both sides of the bag opening. Each control group includes at least two control components. Each control component can be linked to a control area on the outer circumferential surface of the bag opening, and the control component can be operably moved.

[0006] The control element includes three different postures. When the control element is in the first posture, each control element is arranged next to the corresponding control area so that the control element can be connected to the corresponding control area. When the control element is in the second posture, the control elements of the at least two control groups are arranged in a regular pattern. When the control element is in the third posture, the distance between two adjacent control elements is smaller than the distance between them in the second posture.

[0007] In one or more embodiments, the control area is evenly distributed on the outer circumferential surface of the bag opening.

[0008] In one or more embodiments, a clamping piece is arranged at the control area, and the control member includes a gripper for clamping the clamping piece so that the control member can be linked with the corresponding control area.

[0009] In one or more embodiments, the bag opening is initially circular, and when the control element is in a first posture, the at least two control groups are distributed on a circle centered on the geometric center of the bag opening.

[0010] In one or more embodiments, a first drive mechanism is further included, which is used to drive the control element to switch between the first posture, the second posture, and the third posture.

[0011] In one or more embodiments, each of the control groups includes a pair of the control elements, and the first drive mechanism includes:

[0012] A rotary drive element is used to drive the control component to rotate in a direction away from or close to the bag opening, so as to control the control component to switch between the first posture and the second posture;

[0013] A translational drive element is used to drive the control element to reciprocate along a first direction, so as to control the control element to switch between the second posture and the third posture;

[0014] Wherein, the first direction is the direction of the connection between the control components in the same group.

[0015] In one or more embodiments, it further includes:

[0016] An insert is arranged between adjacent control elements;

[0017] The second drive mechanism is used to drive the insert to move in a direction closer to or away from the bag opening.

[0018] In one or more embodiments, the second driving mechanism is used to drive the insert to reciprocate along a second direction;

[0019] The second direction and the first direction are perpendicular to each other, and the first direction is the direction of the connection between the control components in the same group.

[0020] To achieve the above objectives, a second aspect of this application provides a bag opening forming method employing the bag opening forming mechanism described in any of the above embodiments, comprising:

[0021] Switch the control unit to the first posture and control the control unit to connect with the corresponding control area;

[0022] The control element is switched to the second posture so that the bag opening presents a regular shape.

[0023] Switch the control element to the third posture to tighten the bag opening;

[0024] The control element is separated from the corresponding control area.

[0025] In one or more embodiments, the bag opening forming mechanism further includes an insert disposed between adjacent control members, and the insert is operable to move in a direction toward or away from the bag opening;

[0026] The bag opening forming method further includes:

[0027] When the control member switches from the second posture to the third posture, the insertion member is controlled to move along the direction close to the bag opening and be inserted into the bag opening, so that the side of the bag opening is M-shaped.

[0028] When the control element separates from the corresponding control area, the insert element is reset.

[0029] To achieve the above objectives, a third aspect of this application provides an automated forming and unpacking device, comprising:

[0030] A bag-expanding mechanism is used to expand the bag opening;

[0031] The bag opening forming mechanism described in any of the above embodiments is arranged at the bottom of the bag expanding mechanism;

[0032] A lifting drive mechanism is used to drive the bag expanding mechanism and the bag opening forming mechanism to lift synchronously and relative to each other.

[0033] The advantages of this application, which differ from existing technologies, are:

[0034] This application achieves automatic forming and closing of the bag mouth M-side by controlling the control components of the bag mouth forming mechanism to switch between the first, second, and third postures and working in conjunction with the insert plate. By controlling the synchronous and relative lifting of the bag expansion mechanism and the bag mouth forming mechanism, it can achieve automated bag unloading and bag mouth forming after the ton bag is loaded, with a high degree of automation and reduced reliance on manual labor. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of one embodiment of the bag opening forming mechanism of this application;

[0037] Figure 2 This is a schematic diagram of one embodiment of the gripper in the first posture of this application;

[0038] Figure 3 This is a schematic diagram of one embodiment of the gripper in the second posture of this application;

[0039] Figure 4This is a schematic diagram of one embodiment of the gripper in the third posture of this application;

[0040] Figure 5 This is a schematic diagram of the structure of one embodiment of the control group of this application;

[0041] Figure 6 This is a schematic diagram of another perspective of one embodiment of the control group of this application;

[0042] Figure 7 This is a top view of one embodiment of the control group of this application;

[0043] Figure 8 This is a flowchart illustrating one embodiment of the bag opening forming method of this application;

[0044] Figure 9 This is a schematic diagram of one embodiment of the automated forming and unpacking device of this application.

[0045] As shown in the figure:

[0046] Bag opening forming mechanism 10; control group 100; control component 101; gripper 102; inserter 103; first drive mechanism 200; rotary drive element 201; translation drive element 202;

[0047] 20; Bag opening; 21; Control area; 22; Clamping piece;

[0048] Bag-expanding mechanism 30. Detailed Implementation

[0049] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0050] This application includes a novel bag opening forming mechanism that can automatically form the bag opening after the ton bag is filled, effectively reducing the manual dependence of the packaging production line, improving operating efficiency and packaging effect, and conveniently realizing the M-side forming of the bag opening through the insert structure.

[0051] Specifically, Figure 1 This is a schematic diagram of one embodiment of the bag opening forming mechanism of this application.

[0052] like Figure 1As shown, the bag opening forming mechanism 10 includes two control groups 100 for adjusting the shape of the bag opening 20 of the packaging bag; each control group 100 includes two control elements 101.

[0053] Among them, the outer ring surface of the bag opening 20 is provided with control areas 21 corresponding to the control components 101, and each control component 101 can be linked with the corresponding control area 21.

[0054] Each control element 101 can be operatively moved and set so that the shape of the bag opening 20 can be adjusted via the control element 101.

[0055] Specifically, in this embodiment, the control element 101 is a gripper 102, which is used to grip the opening 20 of the packaging bag. An insert 103 is also arranged between adjacent grippers 102 in the same control group 100.

[0056] In this embodiment, a clamping piece 22 is formed on the outer ring surface of the bag opening 20. The grippers 102 can clamp the clamping piece 22 to achieve linkage with the bag opening 20. Specifically, the area on the outer ring surface of the bag opening 20 where the clamping piece 22 is arranged can be defined as a control area 21. By clamping a clamping piece 22 with four grippers 102 respectively, the four grippers 102 are linked with the four control areas 21 on the outer ring surface of the bag opening 20. The movement of the grippers 102 will cause the shape of the bag opening 20 to change, thereby controlling the opening or closing of the bag opening 20 through the grippers 102.

[0057] In this embodiment, the clamping pieces 22 are symmetrically distributed on the outer ring surface of the bag opening; in other embodiments, the position of the clamping pieces 22 can also be adjusted based on the actual working conditions, thereby adjusting the expected shape of the bag opening 20.

[0058] The movement process of the gripper 102 in this application is described in detail below. Figure 2 This is a schematic diagram of one embodiment of the gripper in the first posture of this application. Figure 3 This is a schematic diagram of one embodiment of the gripper in the second posture of this application. Figure 4 This is a schematic diagram of one embodiment of the gripper in the third posture of this application.

[0059] like Figures 2 to 4 As shown, the bag opening 20 is expanded into a circle by the bag expansion mechanism 30, and four clamping plates 22 are evenly spaced on the outer ring surface of the bag opening 20. When the gripper 102 is in the first posture, the four grippers 102 are respectively set at the clamping plates 22, and at this time the four grippers 102 clamp the corresponding clamping plates 22.

[0060] Preferably, it also includes a positioning device for positioning the clamping piece 22, facilitating the movement of the gripper 102, so that the gripper 102 and the clamping piece 22 are connected in a one-to-one correspondence. The positioning device allows the bag opening forming mechanism 10 to be matched with packaging bags of different sizes, expanding its application range.

[0061] When the grippers 102 are in the second posture, the four grippers 102 are distributed in a regular pattern. For example, under the force of the grippers 102, the bag opening 20 is rectangular. It should be noted that the distribution position of the four grippers 102 at this time is related to the total outline length of the bag opening 20. It should be ensured that the sum of the adjacent distances of the four control areas is equal to the total outline length of the bag opening 20.

[0062] When the gripper 102 is in the third posture, adjacent grippers 102 in the same group move closer to each other, making the distance between adjacent grippers 102 in the same group smaller than the distance in the second posture, so as to close the bag opening 20. In this embodiment, when the gripper 102 is in the third posture, adjacent grippers 102 in the same group can be fitted together, thereby limiting the bag opening 20 to the thinnest sealing state; of course, in other methods, the distance between adjacent grippers 102 in the same group in the third posture can also be other values, which can be set based on actual working conditions to meet different settings.

[0063] In this embodiment, the insert 103 can also be operably moved in a direction close to or away from the bag opening 20. Preferably, in this embodiment, the insert 103 can be a sheet-like structure extending in the direction pointing towards the bag opening 20, such as... Figures 2 to 4 As shown, when the gripper 102 switches from the second posture to the third posture, the insert 103 can move synchronously along the direction close to the bag opening 20 and insert into the bag opening 20, so that when the gripper 102 is in the third posture, the side of the bag opening 20 is M-shaped.

[0064] It is understood that in other embodiments, the insert 103 may also adopt other structural forms. For example, the insert 103 may be a sheet-like structure extending in other directions, or the insert 103 may not be a sheet-like structure. For example, the insert 103 may be a hook structure with a retaining ring provided at the corresponding position of the bag opening, so that the insert 103 can also move with the outer ring surface of the bag opening. Alternatively, the insert 103 may be an electromagnet with a magnetic metal provided at the corresponding position of the bag opening, so that the insert 103 can also move with the outer ring surface of the bag opening, etc. All of these can achieve the effect of this embodiment, and will not be elaborated here.

[0065] Based on the bag opening forming mechanism 10 described above, the bag opening 20 can be switched from a circle when the bag is in the expanded state to a rectangle, and finally the M-side is formed. The operation is fully automated, which effectively reduces the dependence on manual labor.

[0066] It should be noted that the reason why the grippers 102 are arranged in a circular pattern when in the first posture in this embodiment is to match the shape of the bag opening 20 when the bag is inflated, so that the grippers 102 can be connected to the corresponding clamping piece 22. In other embodiments, when the bag opening 20 is in a different shape when the bag is inflated, the grippers 102 can also be arranged in a different shape when in the first posture. For example, when the bag opening 20 is elliptical when the bag is inflated, the four grippers 102 can also be arranged in an elliptical shape, as long as the grippers 102 can be connected to the corresponding clamping piece 22, the effect of this embodiment can be achieved.

[0067] In addition, in this embodiment, the gripper 102 is used as the control member 101 that is linked to the control area 21 of the bag opening 20. The shape adjustment of the bag opening 20 is achieved by gripping the clamping piece 22 located at the control area 21 of the outer ring surface of the bag opening 20 by the gripper 102. In other embodiments, other control members 101 that can be connected to the control area 21 of the outer ring surface of the bag opening 20 can also be used to achieve the shape adjustment of the bag opening 20. For example, the control area 21 of the bag opening 20 can be provided with a Velcro surface, and the control member 101 can be provided with a matching Velcro hook surface to achieve the connection between the two. Alternatively, the control area 21 of the bag opening 20 can be provided with a magnetic metal, and the control member 101 can be provided with an electromagnet to achieve the connection between the two. Alternatively, the control member 101 and the control area 21 of the bag opening 20 can be provided with a matching buckle structure, etc. It is expected that similar structures can achieve the effect of this embodiment and should all fall within the protection scope of this application, and will not be described in detail here.

[0068] In this embodiment, the bag opening forming mechanism 10 further includes a first drive mechanism 200 for driving the gripper 102 to switch between a first posture, a second posture, and a third posture, and a second drive mechanism for driving the insert 103 to move. Please refer to [link to previous text]. Figures 5 to 7 , Figure 5 This is a schematic diagram of the structure of one embodiment of the control group of this application. Figure 6 This is a schematic diagram of another perspective of one embodiment of the control group in this application. Figure 7 This is a top view of one embodiment of the control group of this application.

[0069] like Figures 5 to 7 As shown, the first driving mechanism 200 includes a rotary driving element 201 and a translational driving element 202. The rotary driving element 201 drives the gripper 102 to rotate in a direction away from or near the bag opening 20, thereby controlling the gripper 102 to switch between a first posture and a second posture. The translational driving element 202 drives the gripper 102 to reciprocate along a first direction, thereby controlling the gripper 102 to switch between a second posture and a third posture. The first direction is the direction of the line connecting the grippers 102 in the same group.

[0070] For example, the rotary drive element 201 can be a conventional telescopic element in the art, such as a cylinder or an electric telescopic rod; the translation drive element 202 can be a translation rodless cylinder. Of course, in other embodiments, the translation drive element 202 can be any other translationally driven element, all of which can achieve the effect of this embodiment.

[0071] In order to ensure the forming effect of the bag opening 20, in this embodiment, when the gripper 102 is in the second posture, the extension directions of the two translation drive elements 202 in the same group can be parallel, so that the two sides of the bag opening 20 that do not fold can always be tightened when the M side is formed.

[0072] In addition, in order to further ensure the forming effect of the bag opening 20, the movement direction of the insert 103 in this embodiment can be a second direction that is perpendicular to the first direction, and the insert 103 is preferably distributed at the center line position of the adjacent grippers 102.

[0073] In this embodiment, the structure of the second drive mechanism is not shown. It is foreseeable that any element in the art that can drive the movement of the insert 103 can be applied in this application. For example, the second drive mechanism can be a displacement mechanism whose output end can clamp the insert 103, such as a cylinder, a hydraulic cylinder, or a robotic arm, etc., all of which can achieve the effect of this embodiment, and will not be described in detail here.

[0074] Based on the above driving structure, the position of the gripper 102 can be quickly switched to complete the automated rapid forming operation of the bag opening 20.

[0075] In the above embodiments, the bag opening forming mechanism 10 includes two control groups 100 disposed on both sides of the bag opening 20. In other embodiments, other numbers of control groups 100 may also be included. For example, two control groups 100 may be arranged on each side of the bag opening 20, so that two M sides can be formed on one side of the bag opening 20. Alternatively, the number of control groups 100 on both sides of the bag opening 20 may be different, all of which can achieve the effect of this embodiment and can be set according to actual needs.

[0076] Furthermore, the first drive mechanism 200 in the above embodiments is only an example. In other embodiments, any displacement drive mechanism that can switch the gripper 102 between three different postures can achieve the effect of this embodiment. For example, the first drive mechanism 200 can be a conventional two-dimensional motion drive device in the art, which can include an X-axis drive mechanism and a Y-axis drive mechanism. By cooperating to adjust the coordinates of the gripper 102, the gripper 102 can switch between three different postures.

[0077] It should be noted that when the gripper 102 is adjusted in position by the X-axis drive mechanism and the Y-axis drive mechanism, each control group 100 may also include other numbers of grippers 102, such as 3, 4, etc. Inserts 103 can be arranged between adjacent grippers 102, thereby forming a structure of multiple M sides on the side of the bag opening 20, which can also achieve the effect of this embodiment.

[0078] This application also provides a method for forming a bag opening 20 using the bag opening forming mechanism 10 of the above embodiments. Please refer to [link to relevant documentation]. Figure 8 , Figure 8 This is a flowchart illustrating one embodiment of the bag opening 20 forming method of this application.

[0079] like Figure 8 As shown, the bag opening forming method includes:

[0080] S100: Switch the control unit to the first posture and connect the control unit to the corresponding control area.

[0081] In one embodiment, the control element 101 can be a gripper 102, and a clamping piece 22 can be arranged in the control area 21 on the outer ring surface of the bag opening 20. The control element 101 can be connected to the control area 21 by controlling the gripper 102 to clamp the clamping piece 22.

[0082] In other embodiments, other structures may be arranged at the control area 21, and the control element 101 may also be other devices that can be linked with the structures arranged at the control area 21. For example, magnetic metal may be arranged at the control area 21, and an electromagnet may be arranged at the control element 101. When the control element 101 switches to the first posture, the electromagnet can be energized to attract the magnet at the control area 21, thereby realizing the connection between the control element 101 and the control area 21.

[0083] S200: Switch the control to the second posture to make the bag opening present a regular pattern.

[0084] When the control component 101 is connected to the corresponding control area 21, the control component 101 is switched to the second posture. At this time, the control area 21 moves with the control component 101, so that the bag opening 20 is arranged into a regular pattern.

[0085] In one embodiment, the controls can be arranged in a rectangular shape, so that the bag opening 20 is arranged into a rectangle.

[0086] S300, switch the control to the third position to tighten the bag opening.

[0087] After the bag opening is shaped into a regular pattern, the adjacent control components 101 in the same group are controlled to move closer to each other until the control component 101 switches to the third posture and the bag opening is tightened and shaped.

[0088] S400: The control unit is separated from the corresponding control area.

[0089] In one embodiment, when the control element 101 is a gripper 102 and a clamping piece 22 is arranged in the control area 21, the clamping piece 22 can be released through the gripper 102 to separate the control element 101 from the corresponding control area 21.

[0090] In other embodiments, when the control element 101 has a different structure and other structures that can be connected to the control element 101 are arranged in the control area 21, other feasible methods can be used to separate the two. For example, when the control element 101 is equipped with an electromagnet and the control area 21 is equipped with a magnetic metal, the electromagnet can be de-energized to separate the control element 101 from the control area 21.

[0091] In one embodiment, when the bag opening forming mechanism further includes an insert 103, the method further includes:

[0092] S500: When the control component switches from the second posture to the third posture, the control insert moves along the direction close to the bag opening and inserts into the bag opening so that the side of the bag opening is M-shaped.

[0093] S600: When the control element is separated from the corresponding control area, the control insert is reset.

[0094] Based on the above steps, when the control component switches to the third posture to tighten the bag opening, the insert 103 is simultaneously inserted into the bag opening 20. At this time, the bag opening 20 is folded, and the side of the bag opening 20 is M-shaped under the action of the insert 103. When the control component 101 separates from the corresponding control area 21, the insert 103 is simultaneously controlled to reset, thus completing the M-shaped forming of the bag opening 20.

[0095] This application also provides an automated forming and unpacking device, which employs the bag opening forming mechanism 10 of any of the above embodiments. Specifically, please refer to... Figure 9 , Figure 9 This is a schematic diagram of one embodiment of the automated forming and unpacking device of this application.

[0096] like Figure 9 As shown, the device includes a bag-expanding mechanism 30 and a bag-mouth forming mechanism 10 according to any of the above embodiments. The bag-expanding mechanism 30 is used to expand the bag mouth 20 of the packaging bag. In one embodiment, it can be an airbag bag-expanding element commonly used in the art. After the bag mouth 20 is expanded by the bag-expanding mechanism 30, material can be fed into the packaging bag through the bag-expanding mechanism 30.

[0097] The bag opening forming mechanism 10 is arranged at the bottom of the bag expanding mechanism 30. It is used to clamp the bag opening 20 during feeding and to close and fold the bag opening 20 after feeding is completed.

[0098] First, the bag expanding mechanism 30 and the bag opening forming mechanism 10 can be controlled to be at the upper bag height. At this time, the bag opening 20 of the packaging bag can be placed on the bottom of the bag expanding mechanism 30. The bag opening 20 is expanded by the bag expanding mechanism 30. According to step S100, the gripper 102 of the bag opening forming mechanism 10 is controlled to switch to the first posture to clamp the clamping piece 22 and start feeding.

[0099] After the material is loaded, the bag expansion mechanism 30 and the bag mouth forming mechanism 10 can be controlled by a lifting drive unit to descend synchronously from the bag height to the bag removal height. At this time, the packaging bag filled with material can be supported by the conveyor belt and other support structures.

[0100] Furthermore, the lifting drive unit can be used to control the bag expanding mechanism 30 to reset to the upper bag height and control the bag opening forming mechanism 10 to maintain the bag release height. At this time, the bag expanding mechanism 30 can separate from the bag opening 20 to complete the bag release operation. At this time, the bag opening 20 is in an expanded state; then, through steps S200 to 400, the M-side of the bag opening 20 can be automatically formed to complete the bag opening 20 closing operation.

[0101] It should be noted that the bag loading height and bag unloading height in this embodiment can be any preset height. At the bag loading height, the manual or automatic bag loading device can simply put the bag opening 20 onto the bag expanding mechanism 30. At the bag unloading height, the bag expanding mechanism 30 can separate from the bag opening 20, and the bag opening forming mechanism 10 can close the bag opening 20. Both can achieve the effect of this embodiment.

[0102] To avoid safety hazards, preferably, the packaging bag can be supported by a conveyor belt, working surface or other supporting structure when the bag is lifted, so that the packaging bag can be separated from the bag expansion mechanism 30 under the supported state, and it is also convenient to operate the bag mouth forming mechanism 10.

[0103] In addition, in this embodiment, the height of the upper bag is higher than the height of the bag removal. In some other specific embodiments, the height of the upper bag may be lower than the height of the bag removal, that is, the bag can also be removed at a high position. For example, the separation of the packaging bag from the bag expansion mechanism 30 in the supported state can be achieved by arranging a support structure that can be moved to the bottom of the packaging bag at a high position. Both can achieve the effect of this embodiment.

[0104] In this embodiment, the lifting drive unit can be any telescopic element commonly used in the art, such as a hydraulic cylinder, a pneumatic cylinder, etc., all of which can achieve the effect of this embodiment.

[0105] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0106] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A bag opening forming mechanism, characterized in that, include: At least two control groups are respectively located on both sides of the bag opening. Each control group includes at least two control components. Each control component can be linked to a control area on the outer circumferential surface of the bag opening, and the control component can be operably moved. The control element includes three different postures. When the control element is in the first posture, each control element is arranged next to the corresponding control area so that the control element can be connected to the corresponding control area. When the control element is in the second posture, the control elements of the at least two control groups are arranged in a regular pattern. When the control element is in the third posture, the distance between two adjacent control elements is smaller than the distance between them in the second posture.

2. The bag opening forming mechanism according to claim 1, characterized in that, The control area is evenly distributed on the outer circumference of the bag opening.

3. The bag opening forming mechanism according to claim 1, characterized in that, A clamping plate is arranged in the control area, and the control element includes a gripper for clamping the clamping plate so that the control element can be linked with the corresponding control area.

4. The bag opening forming mechanism according to claim 1, characterized in that, The bag opening is initially circular. When the control unit is in the first posture, the at least two control groups are distributed on a circle centered on the geometric center of the bag opening.

5. The bag opening forming mechanism according to claim 1, characterized in that, It also includes a first drive mechanism, which is used to drive the control unit to switch between the first posture, the second posture and the third posture.

6. The bag opening forming mechanism according to claim 5, characterized in that, Each of the control groups includes a pair of control elements, and the first drive mechanism includes: A rotary drive element is used to drive the control component to rotate in a direction away from or close to the bag opening, so as to control the control component to switch between the first posture and the second posture; A translational drive element is used to drive the control element to reciprocate along a first direction, so as to control the control element to switch between the second posture and the third posture; Wherein, the first direction is the direction of the connection between the control components in the same group.

7. The bag opening forming mechanism according to claim 1, characterized in that, Also includes: An insert is arranged between adjacent control elements; The second drive mechanism is used to drive the insert to move in a direction closer to or away from the bag opening.

8. The bag opening forming mechanism according to claim 7, characterized in that, The second drive mechanism is used to drive the insert to reciprocate along the second direction; The second direction and the first direction are perpendicular to each other, and the first direction is the direction of the connection between the control components in the same group.

9. A bag opening forming method using the bag opening forming mechanism according to any one of claims 1 to 8, characterized in that, include: Switch the control unit to the first posture and control the control unit to connect with the corresponding control area; The control element is switched to the second posture so that the bag opening presents a regular shape. Switch the control element to the third posture to tighten the bag opening; The control element is separated from the corresponding control area.

10. The bag opening forming method according to claim 9, characterized in that, The bag opening forming mechanism further includes an insert arranged between adjacent control elements, and the insert is operable to move in a direction toward or away from the bag opening; The bag opening forming method further includes: When the control member switches from the second posture to the third posture, the insertion member is controlled to move along the direction close to the bag opening and be inserted into the bag opening, so that the side of the bag opening is M-shaped. When the control element separates from the corresponding control area, the insert element is reset.

11. An automated forming and unpacking device, characterized in that, include: A bag-expanding mechanism is used to expand the bag opening; The bag opening forming mechanism according to any one of claims 1 to 8 is arranged at the bottom of the bag expanding mechanism; A lifting drive mechanism is used to drive the bag expanding mechanism and the bag opening forming mechanism to lift synchronously and relative to each other.

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