A bottom opening and tongue folding mechanism of a bag body forming apparatus

Abstract

The utility model relates to paper bag machine field discloses a mechanism of opening bottom and folding tongue of bag body forming equipment, including frame, be provided with bag body conveying path on the frame, bag body is sent to open bag station, tongue folding station and bag folding station along bag body conveying path, be provided with first open bag piece, rear surface limiting piece or second open bag piece, tongue folding piece and bag pressing piece on open bag station, first open bag piece is connected with the open bag power source of driving its z axle direction movement, the other side bag surface away from first open bag piece has rear surface limiting piece or second open bag piece, rear surface limiting piece is pressed in the side of bag body close to rear surface or rear surface inner surface or adsorbs the rear surface of bag body, second open bag piece is connected with the open bag power source of driving its z axle direction movement. The tongue folding piece of both sides respectively has one end to set up on the rotating axle. The utility model mechanism of opening bottom and folding tongue realizes the efficient, accurate operation of bag body opening bottom and folding tongue operation through the cooperation of each component.

Description

Technical Field

[0001] This utility model relates to the field of bag processing equipment, and in particular to a bottom opening and flap folding mechanism for bag forming equipment. Background Technology

[0002] In the bag forming process, for bags with flaps that require bottom sealing, after the bag is formed into a tube, the flaps on both sides at the bottom need to be pressed into the bag before compressing and sealing the bottom. The handling of the bottom flaps is a crucial step. Traditional bag forming equipment suffers from numerous problems in opening the bottom flaps, such as uneven opening, inaccurate flap insertion, and low efficiency. The most frequent issue is that after the flaps are inserted into the bag, they easily pop outwards or form additional creases during the compression and folding process. These problems not only affect the forming quality of the bag but also reduce production efficiency and increase production costs. Therefore, a mechanism that can efficiently and accurately complete the bottom flap opening and sealing operation of bags is needed. Utility Model Content

[0003] This utility model addresses the shortcomings of existing technologies by providing a bottom-opening and flap-folding mechanism for a bag forming device.

[0004] To solve the above-mentioned technical problems, this utility model achieves its solution through the following technical solution: A bottom-opening and flap-folding mechanism for a bag forming machine includes a frame with a bag conveying path. The bag is conveyed along the bag conveying path to an opening station, a flap-folding station, and a bag-folding station. The flap-folding station, bag-folding station, and opening station are located at the same station; or the flap-folding station and opening station are located at the same station, with the bag-folding station located downstream of that station; or both the flap-folding station and bag-folding station are located downstream of the opening station.

[0005] The bag opening station is equipped with a first bag opening component, a rear surface limiting component or a second bag opening component, a flap component, and a bag pressing component. The first bag opening component is connected to a power source that drives its movement along the z-axis, and moves the front surface of the bag away from the rear surface by adsorption or pushing. On the other side of the bag surface away from the first bag opening component, there is a rear surface limiting component or a second bag opening component. The rear surface limiting component presses against the side of the bag near the rear surface, or onto the inner surface of the rear surface, or adsorbs the rear surface of the bag to prevent relative movement between the front and rear surfaces of the bag. The second bag opening component is connected to a power source that drives its movement along the z-axis, and moves the rear surface of the bag by adsorption or pushing. One end of each flap component on both sides is mounted on a rotating shaft, causing the flap components to swing around the rotating shaft as the central axis, pushing the flaps on both sides of the bag bottom into the bag body.

[0006] Preferably, a bag-pressing component is provided at the bag-folding station. If the bag-folding station and the bag-opening station are located at the same station, the bag-pressing component acts on at least one of the front and rear surfaces of the bag body through a bag-pressing power source, causing the front and rear surfaces of the bag body in the open state to move towards each other. If the bag-folding station is located downstream of the bag-opening station, the bag-pressing component acts on at least one of the front and rear surfaces of the bag body through a bag-pressing power source or through its own guidance, causing the front and rear surfaces of the bag body in the open state to move towards each other.

[0007] Preferably, the bag pressing component and the first bag opening component share common parts or are different parts. If a second bag opening component is provided at the bag opening station, the bag pressing component and the second bag opening component share common parts or are different parts.

[0008] Preferably, the flap is adjusted to correspond to the position of the opened bag by changing its own shape or by setting its position on the rotating shaft.

[0009] Preferably, when the front and rear surfaces of the bag presser move symmetrically towards each other, its side and the center crease line of its flap remain on the original plane, and the flap remains aligned with the center crease line and gradually swings away from the bag body when it swings.

[0010] Preferably, when only one side of the front and rear surfaces is connected to the pressure power source, during the pressing process of the bag body under the action of the pressure component, its side and the center crease line of its flap move along the z-axis, and the flap moves synchronously with the center crease line and gradually swings away from the bag body.

[0011] Preferably, the rotating shaft of the folding tongue is fitted with a synchronous pulley that works synchronously with it, and the synchronous pulley is fitted with a synchronous belt that drives the rotation. At least one of the synchronous pulleys is connected to a rotational power source.

[0012] Preferably, when the pressing component begins to press the bag surface along the z-axis, the flap is located inside the bag and in a first state where the angle between it and the side of the bag is less than 90°. Before the pressing component fully presses down, the flap flips outward to a second state perpendicular to the bag opening and then swings away from the bag. Between the first and second states, the flap remains flush with the preset center crease of the flap through its movement along the z-axis. The intermittent conveying of the bags along the bag conveying path ensures orderly production. The bag opening and flap folding device, through the cooperation of the first opening component and the rear surface limiting component, can smoothly separate and open the front and rear surfaces of the bag, creating conditions for subsequent flap folding operations. The flap can swing around the rotation axis to push the flaps on both sides of the bag bottom into the bag. The pressing component can make the front and rear surfaces of the bag in the open state move towards each other. During the pressing process, the flap, through its downward movement in coordination with the pressing component, keeps the downward compression and folding of the bag in sync with the folding speed of the flaps on both sides towards the center crease, ensuring the accuracy and stability of the flap folding operation. The action of folding the flap inward must be completed before pressing the bag, and the specific timing is not limited.

[0013] Preferably, the rotating shaft of the folding tongue is fitted onto a synchronous pulley, and another synchronous pulley connected to a rotational power source is located on the other side. Both synchronous pulleys are fitted with synchronous belts, which drive the mechanism. This transmission method, using synchronous pulleys and belts, offers high transmission accuracy and stability, ensuring precise oscillation of the folding tongue and guaranteeing the accuracy of the folding operation.

[0014] Preferably, the system also includes a mounting bracket with a guide screw connected to a second rotary power source. A movable nut is threaded onto the guide screw, and a connecting plate is fixedly connected to the movable nut. The mounting bracket also features a guide rail with a movable slider that slides along the z-axis. The connecting plate is fixedly connected to the movable slider. The cooperation of the guide screw and nut improves the accuracy of the tongue-folding operation.

[0015] Preferably, the folding tongue is linked to the connecting plate, and the movement of the connecting plate drives the movement of the folding tongue.

[0016] Preferably, the moving speed of the flap between the first and second states is half the moving speed of the bag-pressing component. Specifying that the moving speed of the flap between the first and second states is half the moving speed of the bag-pressing component ensures that the flap aligns better with the center crease of the bag's flap during the pressing process of the bag-pressing component, guaranteeing the quality of the flap.

[0017] Preferably, the first opening component includes a suction nozzle located on the front surface of the corresponding bag body. The suction nozzle acts on the front surface of the bag body, generating suction to reliably adhere to the front surface, facilitating the separation of the front and rear surfaces of the bag and improving the reliability of opening the bag.

[0018] Preferably, the first bag-opening component includes a bag-opening pull plate, which is correspondingly located at the front folded edge of the bag body. The bag-opening pull plate and the suction nozzle are each provided with a bag-opening power source or share a common bag-opening power source. The bag-opening pull plate is connected to a transverse transmission assembly that drives it to move along the x-axis. The bag-opening pull plate assists the suction nozzle in the bag-opening operation, and the transverse transmission assembly enables the bag-opening pull plate to move horizontally inward and outward, better adapting to the bag-opening requirements.

[0019] Preferably, the rear surface limiting member is positioned on the inner side of the lower folded edge of the bag body to hold the rear surface of the bag body in place. The rear surface limiting member is plate-shaped, and its bottom is connected to a transverse transmission assembly that drives it to move along the x-axis. The rear surface limiting member can hold the rear surface of the bag body in place, preventing relative movement of the rear surface. The transverse transmission assembly allows the rear surface limiting member to move horizontally in and out, facilitating the limiting of bags of different sizes.

[0020] Preferably, the lateral movement transmission assembly includes a lateral movement power source, a swing arm, and a fixed block. One end of the swing arm is hinged to the output end of the lateral movement power source, and one end of the fixed block is hinged to the end of the swing arm near the lateral movement power source. The other end of the fixed block is connected to the end of the swing arm away from the lateral movement power source via a spring. The fixed block is arc-shaped, and its center is mounted on a hinge seat via a hinge shaft. The lateral movement power source drives the fixed block and the swing arm to swing through linear reciprocating motion, thereby driving the bag opening pull plate or the rear surface limiting component to move horizontally inward and outward. This transmission method is simple and reliable, accurately achieving the horizontal movement of components into the area where the bag is located, and retracting during bag transport to prevent interference with bag transport.

[0021] Preferably, the bag conveying path is formed on a conveyor belt or conveyor chain, and push blocks are spaced apart on the conveyor belt or conveyor chain. The push blocks can accurately push the bag forward, ensuring intermittent conveying of the bag and improving production efficiency.

[0022] Preferably, the flap also includes an initial state in which it is completely outside the bag body. The flap is in the initial state when the bag body arrives at the flap station and when it leaves the flap station.

[0023] This utility model, by adopting the above technical solution, has significant technical effects: the bottom opening and flap folding mechanism of the bag forming equipment, through the coordinated cooperation of various components, achieves efficient and accurate bottom opening and flap folding operations. It can adapt to the production needs of bags of different specifications, improving the forming quality and production efficiency of the bags. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a structural diagram of the mounting bracket on one side; Figure 3 This is a structural diagram of the mounting bracket from another angle; Figure 4 yes Figure 3 A magnified view of part A in the image; Figure 5 yes Figure 3 A magnified view of part B in the image.

[0025] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Bag conveying path; 2. Bag opening power source; 3. Rear surface limiting component; 4. Folding tongue component; 41. Synchronous pulley; 42. Rotation power source one; 43. Synchronous belt; 44. Rotating shaft; 5. Bag pressing component; 6. Mounting bracket; 61. Guide screw; 62. Rotation power source two; 63. Moving nut; 64. Connecting plate; 65. Guide slide rail; 66. Moving slider; 71. Suction nozzle; 72. Bag opening pull plate; 81. Lateral movement power source; 82. Swing arm; 83. Fixing block; 84. Spring; 85. Hinge seat. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0027] Example 1 A bottom flap folding mechanism for a bag forming device, such as Figure 1-5As shown, the system includes a frame with a bag conveying path 1. Bags are conveyed along the bag conveying path 1 to an opening station, a flap folding station, and a bag folding station. The opening station is equipped with a first opening component, a rear surface limiting component 3 or a second opening component, a flap folding component 4, and a bag pressing component 5. The first opening component is connected to an opening power source 2 that drives its z-axis movement and moves the front surface of the bag away from the rear surface by adsorption or pushing. If a rear surface limiting component 3 is present, it presses against the side of the bag near the rear surface, or onto the inner surface of the rear surface, or adsorbs the rear surface of the bag to prevent relative movement between the front and rear surfaces. If a second opening component is present, it is connected to the opening power source 2 that drives its z-axis movement and moves the rear surface of the bag by adsorption or pushing. The flap 4 can be set parallel to the front and rear surfaces of the bag bottom. One end of each flap 4 on both sides is set on the rotating shaft 44, so that the flap 4 swings around the rotating shaft 44 as the central axis to push the flaps on both sides of the bag bottom into the bag body. The purpose of the rear surface limiting member 3 is to press down the corners of the side of the bag body, or to extend into the bag body to press down, or to connect to a negative pressure source to adsorb the rear surface of the bag body. The adsorption method of the first bag opening member and the second bag opening member (if any) refers to the suction cup with negative pressure adsorbing the surface of the bag body and then moving it. The pushing method refers to extending into the inner surface of the bag body or the corner of the side of the bag body to push the bag body open. Here, the front and rear surfaces are just a surface distinction, not a specific limitation.

[0028] A bag-pressing component 5 is installed at the bag-folding station. If the bag-folding station and the bag-opening station are located at the same station, the bag-pressing component 5, connected to a bag-pressing power source, acts on at least one of the front and rear surfaces of the bag, causing the front and rear surfaces of the bag in the open state to move relative to each other. If the bag-folding station is downstream of the bag-opening station, the bag-pressing component 5, connected to a bag-pressing power source or guided by itself, acts on at least one of the front and rear surfaces of the bag, causing the front and rear surfaces of the bag in the open state to move relative to each other. If they are at different stations, bag pressing can be achieved through the extension direction of objects such as guide rods, belts, or guide plates. If they are at the same station, a bag-opening power source is required.

[0029] The flap 4 adjusts its position relative to the opened bag body by changing its own shape or by positioning it on the rotating shaft 44. The flap 4 can be made of deformable material, such as wire or shape-memory metal, to change its shape. The position adjustment on the rotating shaft 44 can be manual, such as by using bolt locking, nut and screw locking, or other locking methods common in the art.

[0030] When the front and rear surfaces of the bag-pressing component 5 move symmetrically towards each other, its side and the center crease line of its flap remain on the original plane. When the flap 4 swings, it remains aligned with the center crease line and gradually swings away from the bag body.

[0031] When only one side of the front and rear surfaces of the bag pressing component 5 is connected to the bag pressing power source, during the pressing process of the bag body under the action of the bag pressing component 5, its side and the middle crease line of its folding tongue move along the z-axis direction, and the folding tongue component 4 moves synchronously with the middle crease line and gradually swings away from the bag body.

[0032] The rotating shaft 44 of the folding tongue 4 is fitted with a synchronous pulley 41 that is synchronously engaged with it. The synchronous pulley 41 is fitted with a synchronous belt 43 and is driven by the synchronous belt 43. At least one synchronous pulley 41 is connected to a rotational power source 42.

[0033] In one embodiment, the bag-pressing component 5 can move along the z-axis to make the front and rear surfaces of the bag in the open state move towards each other. The bag-pressing component 5 and the first bag-opening component may share common parts or have different parts. During the pressing process of the bag under the action of the bag-pressing component 5, its side and the center crease line of its flap move along the z-axis. The flap 4 moves synchronously with the center crease line and gradually swings away from the bag body. When the bag-pressing component 5 begins to press the bag surface along the z-axis, the flap 4 is located inside the bag and in a first state where the angle between it and the side of the bag is less than 90°. Before the bag-pressing component 5 fully presses down, the flap 4 flips outward to a second state perpendicular to the bag opening and then swings away from the bag body. Between the first and second states, the flap 4 remains flush with the preset center crease of the flap through its movement along the z-axis. The bags on the bag conveying path are conveyed intermittently, ensuring orderly production. The bag opening and flap folding device, through the cooperation of the first opening component and the rear surface limiting component, can smoothly separate and open the front and rear surfaces of the bag, creating conditions for the subsequent flap folding operation. The flap folding component can rotate around the central axis 44 to push the flaps on both sides of the bag bottom into the bag body. The bag pressing component can make the front and rear surfaces of the bag body in the open state move towards each other. Furthermore, during the bag pressing process, the flap folding component, through its downward movement in coordination with the action of the bag pressing component, ensures that the downward compression and folding of the bag body and the folding speed of the upper and lower sides of the flap towards the center fold line are coordinated, ensuring the accuracy and stability of the flap folding operation. Among them, the inward flap folding action of the flap folding component needs to be completed before the bag pressing, and the specific timing is not limited. The flap folding component 4 can be a sheet or a rod.

[0034] In this embodiment, the bag pressing component 5 and the first bag opening component may share common parts or be different parts. In one embodiment, the first bag opening component and the bag pressing component 5 may be completely different parts. In another embodiment, the bag pressing component 5 includes a suction nozzle 71, which may also be used by the bag pressing component 5 to open the bag. The suction nozzle 71 is located on the front surface of the corresponding bag body.

[0035] The rotating shaft 44 of the folding tongue component 4 is fitted with a synchronous pulley 41, and another synchronous pulley 41 connected to a rotational power source 42 is provided on the other side. The two synchronous pulleys 41 are fitted with a synchronous belt 43 and are driven by the synchronous belt 43. The folding tongue component is driven by the synchronous pulleys and synchronous belt. This transmission method has the characteristics of high transmission accuracy and good stability, which can accurately realize the swing of the folding tongue component and ensure the accuracy of the folding tongue operation.

[0036] The system also includes a mounting bracket 6, on which a guide screw 61 is mounted. The guide screw 61 is connected to a second rotary power source 62. A movable nut 63 is threaded onto the guide screw 61, and a connecting plate 64 is fixedly connected to the movable nut 63. The mounting bracket 6 also has a guide rail 65, on which a movable slider 66 that can slide along the z-axis is mounted. The connecting plate 64 is fixedly connected to the movable slider 66. In one embodiment, the flap 4 is linked to the connecting plate 64; the movement of the connecting plate 64 drives the flap 4 to move. A direct connection means the flap 4 is directly connected to the connecting plate 64. An indirect connection means there are other components between the flap 4 and the connecting plate 64. The opening power source 2 connected to the first opening component can also have the above structure, or the power sources of the flap 4 and the first opening component can be connected to the movable nut 63 on a guide screw 61, respectively.

[0037] Between the first and second states, the moving speed of the flap 4 is half the moving speed of the bag-pressing component 5. Speed ​​control can be achieved by providing power from two separate opening power sources. Alternatively, the bag-pressing component 5 can be driven in the same way as the flap 4, with their rotational power sources linked. For example, a synchronous pulley can be used to drive two guide screws 61 to rotate. In this case, a synchronous pulley of the same size can drive guide screws 61 with different pitches, provided the transmission ratio between the moving nut 63 connected to the flap 4 and the bag-pressing component 5 is 1:2.

[0038] The first opening component includes a suction nozzle 71, which is located on the front surface of the corresponding bag body.

[0039] The first bag opening component includes a bag opening pull plate 72, which is correspondingly located at the front folded edge of the side of the bag body. The bag opening pull plate 72 and the suction nozzle 71 are respectively provided with a bag opening power source 2 or share a bag opening power source 2. The bag opening pull plate 72 is connected to a transverse transmission component that drives it to move along the x-axis direction.

[0040] The rear surface limiting member 3 is correspondingly set on the inner side of the lower folded edge of the side of the bag body, and is used to hold the rear surface of the bag body; the rear surface limiting member 3 is plate-shaped, and the bottom of the rear surface limiting member 3 is connected to a transverse transmission assembly that drives it to move along the x-axis direction.

[0041] The transverse transmission assembly includes a transverse force source 81, a swing arm 82, and a fixed block 83. One end of the swing arm 82 is hinged to the output end of the transverse force source 81. One end of the fixed block 83 is hinged to the end of the swing arm 82 near the transverse force source 81. The other end of the fixed block 83 is connected to the end of the swing arm 82 away from the transverse force source 81 by a spring 84. The fixed block 83 is arc-shaped. The center of the fixed block 83 is mounted on a hinge seat 85 through a hinge shaft. The transverse force source 81 drives the fixed block 83 and the swing arm 82 to swing through linear reciprocating motion, thereby driving the bag opening pull plate 72 or the rear surface limiting member 3 to move horizontally inward and outward.

[0042] The bag conveying path 1 is formed on a conveyor belt or conveyor chain, and push blocks are spaced apart on the conveyor belt or conveyor chain. Among them, the first and second rotary power sources 62 can be common power sources in the art, such as rotary cylinders, rotary electric cylinders, and motors. Other linear power sources, such as the bag opening power source 2, can be common power sources in the art, such as cylinders, motor lead screws, motor swing arms, and motor synchronous belt lead screw and nut assemblies, and are not limited here.

[0043] The flap 4 also includes the initial state when it is completely outside the bag body. When the bag body arrives at the flap folding station and when it leaves the flap folding station, the flap 4 is in the initial state.

[0044] The bag can be conveyed either flat or vertically. The working principle is explained below: The bag is conveyed along conveyor path 1 to the position corresponding to the bag opening and flap device. Conveying is paused, or the processing device at the corresponding station is synchronized with the bag conveying. At this time, the bag is compressed, and the rear surface limiting member 3 presses down on the bottom side or inner surface of the bag. The first opening member opens the bag. Simultaneously, the flap member 4 swings inward, pushing the flaps on both sides of the bag bottom into the bag body from the outside. At this time, the flap member 4 is located inside the bag and in a first state where the angle between it and the side of the bag is less than 90°. Next, the pressing member 5 descends to press the bag, and the flap member 4 descends at half speed, maintaining contact with the flaps to prevent them from springing outward and compressing along the center crease line. Before the bag is fully compressed, the flap member 4 flips outward to a second state perpendicular to the bag opening and then swings away from the bag body to avoid affecting subsequent bag conveying. If the rear surface limiting member 3 would affect bag conveying, it would retract outward. The various components of the bag-pressing part 5 are then reset. The bag body then proceeds to the next processing step.

[0045] The bag opening process involves the first opening component starting to operate after the bag is transported to the designated position. The suction nozzle 71 of the first opening component generates suction to adhere to the front surface of the bag. Simultaneously, the opening pull plate 72, driven by the transverse transmission assembly, moves to a suitable position, working in conjunction with the suction nozzle 71 to separate the front and rear surfaces of the bag. The rear surface limiting component 3, driven by the transverse transmission assembly, moves to above the lower folded edge on the side of the bag, locking the rear surface of the bag and preventing relative movement of the rear surface.

[0046] Folding flap operation: The folding flap 4, driven by the synchronous pulley 41 and synchronous belt 43, swings around the rotating shaft 44 as the central axis to push the folding flaps on both sides of the bag bottom into the bag body. When the pressing bag 5 begins to press the bag surface along the z-axis, the folding flap 4 is located inside the bag and is in the first state. As the pressing bag 5 presses down, the folding flap 4 adjusts its position at half the moving speed of the pressing bag 5, always keeping it flush with the preset center crease of the folding flap. Before the pressing bag 5 presses down completely, the folding flap 4 flips outward to the second state perpendicular to the bag opening and then swings away from the bag body.

[0047] The movement of the folding tongue 4 along the z-axis can be achieved by rotating the guide screw 61 on the mounting bracket 6 under the drive of the second rotary power source 62, causing the moving nut 63 to drive the connecting plate 64 to move, thereby adjusting the height of the folding tongue 4.

[0048] In the description of this utility model, it should be understood that when the bag body is located at the bag opening station or the flap folding station, the direction from the bag opening to the bag body is the y-axis direction, the connection direction of the flaps on both sides of the bag bottom is the x-axis direction, and the relative movement direction of the front and rear surfaces of the bag body when it is opened or flattened is the z-axis direction. Terms such as "center," "length," "width," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The power source can be a cylinder, a motor, or a cylinder and motor using gear and rack, lead screw and nut, or slider and guide rail to achieve motion. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of those features. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0049] In summary, the above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall fall within the scope of the patent of the present utility model.

Claims

1. A bottom-opening and flap-folding mechanism for a bag forming device, characterized in that, Including the rack, on which are installed The bag is conveyed along the bag conveying path (1) to the bag opening station, the flap folding station and the bag folding station; the flap folding station, the bag folding station and the bag opening station are located at the same station; or the flap folding station and the bag opening station are located at the same station and the bag folding station is located downstream of that station; or the flap folding station and the bag folding station are both located downstream of the bag opening station. The bag opening station is equipped with - First bag opening component, the first bag opening component is connected to a bag opening power source (2) that drives its z-axis direction to move and drives the front surface of the bag to move away from the rear surface by adsorption or pushing. - The rear surface limiting member (3) or the second opening member, the rear surface limiting member (3) is pressed on the side of the bag body near the rear surface or the inner surface of the rear surface or adsorbs the rear surface of the bag body, in order to block the relative movement of the front and rear surfaces of the bag body, the second opening member is connected to the opening power source (2) that drives its z-axis direction to move and drives the rear surface of the bag body to move by adsorption or pushing. The tongue-folding station is equipped with - Folding tongue piece (4), one end of each of the two folding tongue pieces (4) is set on the rotating shaft (44), so that the folding tongue piece (4) swings around the rotating shaft (44) as the central axis to knock the folding tongues on both sides of the bottom of the bag into the bag body; The bag folding station is equipped with -Pouch pressing component (5): If the folding station and the opening station are located at the same station, the pouch pressing component (5) acts on at least one of the front and rear surfaces of the bag body by connecting to the pouch pressing power source, so that the front and rear surfaces of the bag body in the opening state move towards each other; if the folding station is located downstream of the opening station, the pouch pressing component (5) acts on at least one of the front and rear surfaces of the bag body by connecting to the pouch pressing power source or by its own guidance, so that the front and rear surfaces of the bag body in the opening state move towards each other.

2. The bottom-opening and flap-folding mechanism of a bag forming equipment according to claim 1, characterized in that: The bag pressing component (5) has a shared component or a different component from the first bag opening component. If a second bag opening component is provided at the bag opening station, the bag pressing component (5) has a shared component or a different component from the second bag opening component.

3. The bottom-opening and flap-folding mechanism of a bag forming equipment according to claim 1, characterized in that: The flap (4) adjusts its position to correspond to the opened bag body by changing its own shape or by setting its position on the rotating shaft (44).

4. The bottom-opening and flap-folding mechanism of a bag forming equipment according to claim 1, characterized in that: When the front and rear surfaces of the bag pressing piece (5) move symmetrically towards each other, its side and the center crease line of its flap remain on the original plane. When the flap piece (4) swings, it remains aligned with the center crease line and gradually swings away from the bag body.

5. The bottom-opening and flap-folding mechanism of a bag forming equipment according to claim 1, characterized in that: When only one side of the front and rear surfaces is connected to the bag pressing power source, during the pressing process of the bag body under the action of the bag pressing component (5), its side and the middle crease line of its folding tongue move along the z-axis direction, and the folding tongue component (4) moves synchronously with the middle crease line and gradually swings away from the bag body.

6. The bottom-opening and flap-folding mechanism of a bag forming equipment according to claim 1, characterized in that: The rotating shaft (44) of the folding tongue (4) is fitted with a synchronous pulley (41) that is synchronously engaged with it. The synchronous pulley (41) is fitted with a synchronous belt (43) and is driven by the synchronous belt (43). At least one synchronous pulley (41) is connected to a rotational power source (42).

7. The bottom-opening and flap-folding mechanism of a bag forming equipment according to claim 5, characterized in that: It also includes a mounting bracket (6), on which a guide screw (61) is provided. The guide screw (61) is connected to a second rotary power source (62). A movable nut (63) is threaded onto the guide screw (61). The movable nut (63) is fixedly connected to a connecting plate (64). The mounting bracket (6) is also provided with a guide slide rail (65). A movable slider (66) that can slide along the z-axis is provided on the guide slide rail (65). The connecting plate (64) is fixedly connected to the movable slider (66).

8. The bottom-opening and flap-folding mechanism of a bag forming equipment according to claim 7, characterized in that: The folding tongue (4) is linked with the connecting plate (64), and the movement of the connecting plate (64) drives the folding tongue (4) to move.

9. The bottom-opening and flap-folding mechanism of a bag forming device according to any one of claims 5-7, characterized in that: The moving speed of the flap (4) between the first and second states is half the moving speed of the bag-pressing part (5).

10. The bottom-opening and flap-folding mechanism of a bag forming equipment according to claim 1, characterized in that: The first opening component includes a suction nozzle (71), which is located on the front surface of the corresponding bag body.

11. The bottom-opening and flap-folding mechanism of a bag forming equipment according to claim 6, characterized in that: The first bag opening component includes a bag opening pull plate (72), which is correspondingly set at the front folded edge of the side of the bag body. The bag opening pull plate (72) and the suction nozzle (71) are respectively provided with a bag opening power source (2) or share a bag opening power source (2). The bag opening pull plate (72) is connected to a transverse transmission component that drives it to move along the x-axis direction.

12. The bottom-opening and flap-folding mechanism of a bag forming equipment according to claim 1, characterized in that: The rear surface limiting member (3) is correspondingly set on the inner side of the lower folded edge of the bag body to hold the rear surface of the bag body; the rear surface limiting member (3) is plate-shaped, and the bottom of the rear surface limiting member (3) is connected to a transverse transmission assembly that drives it to move along the x-axis direction.

13. The bottom-opening and flap-folding mechanism of a bag forming equipment according to claim 11 or 12, characterized in that: The transverse transmission assembly includes a transverse force source (81), a swing arm (82), and a fixed block (83). One end of the swing arm (82) is hinged to the output end of the transverse force source (81). One end of the fixed block (83) is hinged to the end of the swing arm (82) near the transverse force source (81). The other end of the fixed block (83) is connected to the end of the swing arm (82) away from the transverse force source (81) by a spring (84). The fixed block (83) is arc-shaped. The center of the fixed block (83) is mounted on the hinge seat (85) through a hinge shaft. The transverse force source (81) drives the fixed block (83) and the swing arm (82) to swing through linear reciprocating motion, thereby driving the bag opening pull plate (72) or the rear surface limiting member (3) to move horizontally inward and outward.

14. The bottom-opening and flap-folding mechanism of a bag forming equipment according to claim 1, characterized in that: The bag conveying path (1) is formed on the conveyor belt or conveyor chain, and push blocks are spaced apart on the conveyor belt or conveyor chain.

15. The bottom-opening and flap-folding mechanism of a bag forming equipment according to claim 1, characterized in that: When the pressing component (5) begins to press the surface of the bag body along the z-axis, the flap (4) is located inside the bag body and is in the first state where the angle between the flap and the side of the bag body is less than 90°. Before the pressing component (5) is fully pressed down, the flap (4) flips outward to the second state where it is perpendicular to the bag opening and then swings away from the bag body. Between the first and second states, the flap (4) always remains flush with the preset center crease of the flap through the lifting and lowering motion. The flap (4) also includes the initial state where it is completely outside the bag body. When the bag body reaches the flap position and leaves the flap position, the flap (4) is in the initial state.

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