V-bottom paper bag forming apparatus
By setting up multiple stations and specific components in the paper bag forming equipment, the entire process of V-bottom paper bag production is automated, solving the problems of low forming efficiency and unstable quality, and ensuring the efficient, precise forming and aesthetic appeal of the paper bags.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WENZHOU YUYI INTELLIGENT TECHNOLOGY CO LTD
- Filing Date
- 2025-08-05
- Publication Date
- 2026-07-24
AI Technical Summary
Existing paper bag forming equipment suffers from low forming efficiency and unstable forming quality when producing V-bottom paper bags. In particular, it lacks efficient and precise devices and methods in key processes such as flap folding, bag folding, and bag opening, which easily leads to defects such as uneven creases and loose bottom adhesion during the paper bag forming process.
A V-bottom paper bag forming machine was designed. By setting up multiple sequentially connected workstations, such as the bag body forming station, the bag body accordion folding station, the bag opening station, the flap folding station, the bag folding station, the pre-opening station, the glue application station, the bag bottom opening station, and the bag body bottom folding station, specific components at multiple workstations, such as the first bag opening component, the flap folding component, the bag pressing component, the bottom support guide component, the first bottom folding component, and the second bottom folding component, the machine achieves fully automated operation of the bag body, ensuring the precise unfolding and folding of the inner and outer bottom panels.
It achieves efficient and precise forming of V-bottom paper bags, with neat and tight bottom creases during the bag forming process, improving production efficiency, reducing manual intervention and process changeover time, and ensuring the quality and aesthetics of the paper bags.
Smart Images
Figure CN224545485U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of paper bag manufacturing equipment, and in particular to V-bottom paper bag forming equipment. Background Technology
[0002] In existing technologies, paper bag forming equipment suffers from low forming efficiency and unstable forming quality when producing V-bottom paper bags. For example, the lack of efficient and precise devices and methods in key processes such as flap folding, bag folding, bag opening, and bottom folding leads to defects such as uneven creases and loose bottom adhesion during the paper bag forming process, affecting the overall quality and performance of the paper bags. Therefore, there is a need for equipment that can improve the forming efficiency and quality of V-bottom paper bags. Utility Model Content
[0003] This invention addresses the shortcomings of existing technologies by providing a V-shaped bottom paper bag forming device.
[0004] To solve the above-mentioned technical problems, this utility model achieves its solution through the following technical solution: The V-bottom paper bag forming equipment includes a bag conveying path. The bag body is conveyed along the bag conveying path to the bag forming station, the bag gusseting station, the bag opening station, the flap folding station, the bag folding station, the pre-opening station, the glue application station, the bag bottom opening station, and the bag bottom folding station. Among them, the bag forming station and the bag gusseting station are sequentially located upstream of the bag opening station, and the pre-opening station, the glue application station, the bag bottom opening station, and the bag bottom folding station are sequentially located downstream of the bag folding station. The flap folding station and the bag folding station are located at the same station as the bag opening 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.
[0005] The bag opening station is equipped with a first bag opening component, which is connected to a bag opening power source that drives its movement in the z-axis direction and drives the front surface of the bag to move away from the rear surface by means of adsorption or pushing.
[0006] The flap folding station is equipped with flap folding components. One end of each flap folding component on both sides is mounted on a rotating shaft, causing the flap folding components to swing around the rotating shaft as the central axis, thus pushing the flaps on both sides of the bag bottom into the bag body. The bag folding station is equipped with a bag pressing component, which acts on at least one of the front and rear surfaces of the bag body, causing the front and rear surfaces of the bag body in the open state to move towards each other.
[0007] The bag bottom opening station is equipped with bottom support guides. These guides, which may be multiple or branched, are inserted between the inner and outer bottom panels. The guides or branched sections extend and act on the inner surfaces of the front and back of the bag, causing the bottom to open from a flat state, thus unfolding the inner and outer bottom panels. As the guides or branched sections extend and act on the inner surfaces of the front and back of the bag, the bag's flap is also folded outwards, aligning almost with the inner and outer bottom panels, facilitating subsequent bonding of the inner bottom panel to the flap.
[0008] The bag body bottom folding station is equipped with a first bottom folding component and a second bottom folding component. The first bottom folding component is located outside the inner bottom sheet of the bag and uses its own extension direction to gradually fold the inner bottom sheet of the bag from horizontal to outer edge inward along the conveying direction. The second bottom folding component is located outside the outer bottom sheet of the bag and downstream of the first bottom folding component. It uses its own extension direction to gradually fold the outer bottom sheet of the bag from horizontal to outer edge inward along the conveying direction and at least partially cover the outer side of the inner bottom sheet of the bag.
[0009] The pre-opening station includes a bag-turning component, which extends to turn at least one of the inner and outer bottom panels of the bag outwards. The gluing station has a gluing component; when the bag is at the gluing station, the inner and outer bottom panels are parallel, and their inner surfaces are opposite to the gluing component. When the bag is at the bottom opening station and the bottom folding station, the conveying direction is parallel to the direction of the bottom fold line.
[0010] This equipment automates the entire process of V-bottom paper bag production, from bag conveying to final forming, by setting up multiple sequentially connected stations, such as a bag forming station, a bag accordion folding station, and a bag opening station. At the bag opening station, the first opening component separates the front and back surfaces of the bag through suction or pushing, laying the foundation for subsequent processes. At the flap folding station, the flap folding component accurately inserts the flaps on both sides of the bag bottom into the bag body. At the bag folding station, the pressing component causes the front and back surfaces of the bag in the open state to move towards each other. At the bag bottom opening station, the bottom support guide effectively opens the inner and outer bottom panels of the bag. At the bag bottom folding station, the first and second bottom folding components fold the inner and outer bottom panels inwards as required, ensuring the precision and quality of the paper bag forming process.
[0011] Preferably, a bag turning station is provided between the bag folding station and the pre-opening station, or between the pre-opening station and the glue-applying station, or between the glue-applying station and the bottom opening station. This turning station is equipped with a cooperating bag-pressing and turning component and a conveying component, located on opposite sides perpendicular to the conveying direction, turning the bag so that the bottom opening faces perpendicular to the conveying direction. Setting up a bag turning station between the bag folding station and the pre-opening station, or at another suitable location, allows the bag to be turned to a sideways position with the bottom opening perpendicular to the conveying direction through the cooperation of the bag-pressing and turning component. This facilitates subsequent glue-applying and bottom-folding processes, improving the equipment's adaptability and production efficiency. Furthermore, setting up a bag turning station between the bag folding station and the pre-opening station, or at another suitable location, allows the bag to be turned to a sideways position with the bottom opening perpendicular to the conveying direction through the cooperation of the bag-pressing and turning component, facilitating subsequent glue-applying and bottom-folding processes, further improving the overall production efficiency of the equipment.
[0012] Preferably, the bottom opening station is also equipped with a rear surface limiting component or a second opening component. The rear surface limiting component presses against the side of the bag near the rear surface, the inner surface of the rear surface, or adheres to the rear surface of the bag, preventing relative movement between the front and rear surfaces of the bag. The second opening component is connected to an opening power source that drives its movement in the z-axis direction and moves the rear surface of the bag by adsorption or pushing. If the folding station and the opening station are located at the same station, the pressing component acts on at least one of the front and rear surfaces of the bag through a pressing power source, causing the front and rear surfaces of the bag to move relative to each other in the opened state. If the folding station is located downstream of the opening station, the pressing component acts on at least one of the front and rear surfaces of the bag through a pressing power source or by its own guidance, causing the front and rear surfaces of the bag to move relative to each other in the opened state. The bottom opening station is equipped with a rear surface limiting component or a second opening component, allowing for flexible adjustment of the pressing component's working mode according to different station layouts, ensuring effective control of the relative movement between the front and rear surfaces of the bag, and further improving the accuracy of opening and folding. If the workstations are different, the bag can be pressed by extending the direction of objects such as guide rods, belts, or guide plates. If the workstations are the same, the bag opening power source is needed.
[0013] Preferably, the bottom opening station is equipped with an inner support plate, an outer support plate, and a folding flap. The inner and outer support plates are respectively located on the outer sides of the inner and outer bottom panels of the bag. The inner and outer support plates, in conjunction with the bottom support guide, limit and maintain the inner and outer bottom panels in an unfolded state. The folding flap is located on the side of the inner and outer support plates near the bottom of the bag. The folding flap keeps the flaps on both sides of the bag bottom pressed against the inner and outer support plates before the inner bottom panel is folded inward. The inner and outer support plates, in conjunction with the bottom support guide, limit and support the inner and outer bottom panels, keeping them unfolded. The folding flap simultaneously presses down on both ends of the flaps to prevent them from rebounding out of the bag bottom. The curved extension design of the first and second bottom folding pieces gradually guides the inner and outer bottom panels to snap inward, resulting in an inverted V-shape when viewed from the side after the bag bottom is folded.
[0014] 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. The flap component adjusts its position corresponding to the opened bag body by changing its own shape or its position on the rotating shaft. The bag-pressing component can share common parts with the first or second bag-opening component or be different parts, increasing the flexibility and adjustability of the equipment. The flap component can adjust its position corresponding to the opened bag body by changing its own shape or position, making it easy to adapt to bags of different sizes.
[0015] Preferably, when the front and rear surfaces of the bag-pressing component move symmetrically towards each other, its side edges and the center crease line of its flap remain on the original plane. The flap maintains its alignment with the center crease line and gradually swings away from the bag body during the swinging motion. When only one side of the bag-pressing component on the front and rear surfaces is connected to the bag-pressing power source, during the pressing process under the action of the bag-pressing component, its side edges and the center crease line of its flap move along the z-axis. The flap moves synchronously with the center crease line and gradually swings away from the bag body. Depending on whether the front and rear surfaces of the bag-pressing component move symmetrically towards each other or only one side is connected to the bag-pressing power source, the flap can adjust its movement accordingly, always maintaining its alignment with the preset center crease line of the flap and gradually swinging away from the bag body, ensuring the stability and accuracy of the flap-folding process.
[0016] Preferably, the system also includes a mounting bracket, on which a guide screw is mounted. The guide screw is connected to a second rotary power source, and a movable nut is threaded onto the guide screw. The movable nut is fixedly connected to a connecting plate. The mounting bracket also has a guide rail, on which a movable slider that can slide along the z-axis is mounted. The connecting plate is fixedly connected to the movable slider, and the folding tongue is linked to the connecting plate. The movement of the connecting plate drives the movement of the folding tongue. Through the cooperation of the guide screw, the second rotary power source, the movable nut, the connecting plate, the guide rail, and the movable slider on the mounting bracket, the linked movement of the folding tongue is achieved, making the position and movement of the folding tongue more precise and controllable.
[0017] 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 a lifting motion. The flap also includes an initial state where it is completely outside the bag. The flap is in the initial state when the bag reaches the flap position and when it leaves the flap position. The flap has specific states at different working stages, such as the first state, the second state, and the initial state. Between the first and second states, it remains flush with the preset center crease of the flap through a lifting motion, ensuring the accuracy and stability of the flap operation while avoiding interference between the flap and the bag.
[0018] Preferably, the system also includes a bag bottom pressing station, located behind the bag bottom folding station. This station is equipped with a center fold guide, an inner support plate, and an outer pressure plate. The center fold guide is located inside the bag corresponding to the center fold line. The angle between the working surfaces of the inner support plate and the outer pressure plate gradually decreases along the conveying direction, guiding the open bottom surface of the bag to close vertically along the center fold line. The center fold guide, inner support plate, and outer pressure plate at the bag bottom pressing station guide the open bottom surface of the bag to close vertically along the center fold line, further ensuring the forming quality of the bag bottom.
[0019] Preferably, the center fold guide is a guide rod or a folding turntable, or the center fold guide is a guide rod and a folding turntable arranged sequentially along the conveying direction.
[0020] Preferably, the bottom support guide has a main body that is inserted between the inner bottom sheet and the outer bottom sheet of the bag, the main body extends along the conveying direction to open up the inner bottom sheet and the outer bottom sheet of the bag, and a support plate is provided on the outer side of the bottom support guide to guide the opening of the bag bottom.
[0021] Preferably, the upper surface of the outer support plate has a curved arc.
[0022] This utility model, by adopting the above technical solution and using multiple sequentially connected workstations, achieves fully automated operation of the V-bottom paper bag from bag body conveying to final forming, and has significant technical effects: The bag opening station separates the front and back surfaces of the bag, laying the foundation for subsequent processes; the flap folding station accurately inserts the flaps on both sides of the bag bottom into the bag body, and the flap folding device can be adjusted according to the movement of the bag pressing device, always maintaining correspondence with the preset center crease line of the flap folding device and gradually swinging away from the bag body, ensuring the stability and accuracy of the flap folding process.
[0023] The bottom opening station's bottom support guide effectively opens the inner and outer bottom panels of the bag. The inner and outer support plates work in conjunction with the bottom support guide to limit and support the inner and outer bottom panels, keeping them in an unfolded state. The first and second bottom folding components at the bag body bottom folding station can fold the inner and outer bottom panels inward as required, ensuring the precision and quality of paper bag forming, so that the bottom of the bag appears as an inverted V shape when viewed from the side after folding.
[0024] The equipment is equipped with multiple sequentially connected stations, including a bag forming station, a bag accordion folding station, and a bag opening station. The formed bags have no crease lines on the front and a straight crease on the bottom. When the paper bags are stored, the sides are inverted V-shaped, resulting in aesthetically pleasing and high-quality bags. The bags complete each forming process sequentially during the conveying process, realizing fully automated operation, reducing manual intervention and process changeover time, and greatly improving production efficiency. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the processing flow of this utility model; Figure 3 This is a structural diagram of the bag opening station, flap folding station, and bag folding station; Figure 4 This is a structural diagram of the mounting bracket; Figure 5 yes Figure 4 Another structural diagram; Figure 6 yes Figure 5 A magnified view of part A in the image; Figure 7 yes Figure 5 A magnified view of part B in the image; Figure 8 This is a structural schematic diagram of the bag turning station; Figure 9 This is a structural diagram of the bag bottom opening station and the bag body bottom folding station; Figure 10 yes Figure 9 Internal structure diagram; Figure 11 This is a structural diagram of the pre-opening bag station and the glue application station.
[0026] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Bag conveying path; 11. Bag pressing and turning component; 12. Conveying component; 13. Bag forming station; 2. Bag opening power source; 3. Rear surface limiting component; 4. Folding tongue component; 41. Synchronous pulley; 42. Rotary power source one; 43. Synchronous belt; 44. Rotating shaft; 5. Bag pressing component; 6. Mounting bracket; 61. Guide screw; 62. Rotary 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; 91. Bag conveying device; 911. Conveyor belt; 912. Conveyor roller; 921. Bottom support guide; 92. Support plate; 931. Inner support plate; 932. Outer support plate; 933. Folding tongue; 941. First fold bottom piece; 942. Second fold bottom piece; 951. Inner support plate; 952. Outer pressure plate; 953. Guide rod; 954. Folding turntable; 961. Conveying platform; 962. Flattening roller; 97. Bag opening device; 98. Glue applicator. Detailed Implementation
[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.
[0028] Example 1 V-bottom paper bag forming equipment, such as Figure 1-2 As shown, the system includes a bag conveying path 1, along which the bag body is conveyed to the following stations: bag forming station, bag gusseting station, bag opening station, flap folding station, bag folding station, pre-opening station, glue application station, bottom opening station, and bottom folding station. The bag forming station and flap folding station are sequentially located upstream of the opening station, while the pre-opening station, glue application station, bottom opening station, and bottom folding station are sequentially located downstream of the folding station. The flap folding station and bag folding station are located at the same station as the opening station; or the flap folding station and opening station are located at the same station, with the bag folding station downstream of that station; or both the flap folding station and bag folding station are downstream of the opening station. The bottom folding station is downstream of the bottom opening station, but the components and station layout may partially overlap.
[0029] like Figure 3-4As shown, a first bag-opening component is provided at the bag-opening station. The first bag-opening component is connected to a bag-opening power source 2 that drives its movement in the z-axis direction. It drives the front surface of the bag away from the rear surface by adsorption or pushing. A rear surface limiting component 3 or a second bag-opening component is also provided at the bag bottom opening station. 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 the bag-opening power source 2 that drives its movement in the z-axis direction. It drives the rear surface of the bag to move by adsorption or pushing. The purpose of the rear surface limiting component 3 is to press down on the corner of the side of the bag, or to extend into the bag to press down, or to connect to a negative pressure source to adsorb the rear surface of the bag. The adsorption method of the first bag-opening component and the second bag-opening component (if present) refers to adsorbing the surface of the bag with a suction cup with negative pressure and then moving it. The pushing method refers to extending into the inner surface of the bag or also the corner of the side of the bag to push the bag open. Here, front and rear surfaces are just a surface distinction, not specific limitations.
[0030] The flap folding station is equipped with flap folding components 4. One end of each flap folding component 4 on both sides is mounted on a rotating shaft 44, causing the flap folding components 4 to swing around the rotating shaft 44 as the central axis, thus pushing the flaps on both sides of the bag bottom into the bag body. The bag folding station is equipped with a bag pressing component 5, which acts on at least one of the front and rear surfaces of the bag body, causing the front and rear surfaces of the bag body in the open state to move towards each other.
[0031] like Figure 9-11 As shown, a bottom support guide 921 is provided at the bag bottom opening station. The bottom support guide 921 has multiple parts or branches. The bottom support guide 921 is inserted between the inner bottom piece and the outer bottom piece of the bag. The multiple bottom support guides 921 or branches extend and act on the inner surfaces of the front and rear sides of the bag body to make the bag bottom open from a flat state to the front and rear sides, so that the inner bottom piece and the outer bottom piece of the bag unfold.
[0032] The bag body bottom folding station is equipped with a first bottom folding component 941 and a second bottom folding component 942. The first bottom folding component 941 is located outside the inner bottom sheet of the bag and uses its own extension direction to gradually fold the inner bottom sheet of the bag from horizontal to outer edge inward along the conveying direction. The second bottom folding component 942 is located outside the outer bottom sheet of the bag and downstream of the first bottom folding component 941. It uses its own extension direction to gradually fold the outer bottom sheet of the bag from horizontal to outer edge inward along the conveying direction and at least partially cover the outer side of the inner bottom sheet of the bag.
[0033] The pre-opening station includes a bag-flipping component 97, which flips at least one of the inner and outer bottom panels of the bag outwards through its extension direction. A glue-applying component 98 is provided at the glue-applying station. When the bag is at the glue-applying station, the inner and outer bottom panels are parallel, and their inner surfaces are opposite to the glue-applying component 98. When the bag is at the bottom opening station and the bottom folding station, the bag's conveying direction is parallel to the extension direction of the bottom fold line. The bottom fold line is the fold line perpendicular to the gusset edge and running laterally across the bag for the user. The bag conveying device 91 at the bottom opening station and the bottom folding station can be a conveyor belt or a conveyor chain, etc. In one embodiment, the bag conveying device 91 includes a conveyor belt 911, with several conveyor rollers 912 arranged above the conveyor belt 911 along the conveying direction, or the conveyor belt 911 is fitted over the conveyor rollers 912.
[0034] like Figure 8 As shown, in one embodiment, a bag turning station is provided between the bag folding station and the pre-opening station, or between the pre-opening station and the glue application station, or between the glue application station and the bottom opening station. The bag turning station is equipped with a bag-pressing and turning component 11 and a conveying component 12 that cooperate with each other. The bag-pressing and turning component 11 and the conveying component 12 are located on opposite sides perpendicular to the conveying direction, turning the bag to a side-facing position with the bottom opening facing perpendicular to the conveying direction. The conveying component 12 can be a conveyor belt, conveyor chain, conveyor roller, conveyor wheel, or other common conveying components in the art. The bag-pressing and turning component 11 can be a pressure plate, pressure roller, or other common components in the art. While one side is being conveyed, the bag-pressing and turning component 11 presses down on the other side of the bag, causing the conveying side to rotate the bag by 90°, thus continuing the conveying process.
[0035] If the folding station and the opening station are located at the same station, the pressing component 5 acts on at least one of the front and rear surfaces of the bag body through a connected pressing power source, causing the front and rear surfaces of the bag body in the open state to move towards each other; if the folding station is located downstream of the opening station, the pressing component 5 acts on at least one of the front and rear surfaces of the bag body through a connected 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.
[0036] like Figure 5-7 As shown, it also includes a mounting bracket 6, on which a guide screw 61 is provided. The guide screw 61 is connected to a rotary power source 62. A movable nut 63 is threadedly connected to the guide screw 61. A connecting plate 64 is fixedly connected to the movable nut 63. 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. The folding tongue 4 is linked with the connecting plate 64. The movement of the connecting plate 64 drives the movement of the folding tongue 4.
[0037] When the pressing component 5 starts pressing the surface of the bag body along the z-axis, the flap 4 is located inside the bag body and is in a first state where the angle between the flap 4 and the side of the bag body is less than 90°. Before the pressing component 5 presses down completely, 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 always remains flush with the preset center crease of the flap through the lifting and lowering motion. The flap 4 also includes an initial state where it is completely outside the bag body. When the bag body reaches the flap folding station and when it leaves the flap folding station, the flap 4 is in the initial state.
[0038] 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 component 5 are then reset. The bag body then proceeds to the next processing step.
[0039] One possible transmission connection method is as follows: the moving speed of the flap 4 between the first and second states is half the moving speed of the bag-pressing component 5. Speed control can be achieved by providing 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 that the transmission ratio between the moving nut 63 connected to the flap 4 and the bag-pressing component 5 is 1:2.
[0040] The first and second bag-opening components can be suction nozzles 71, which are located on the surface of the corresponding bag body. The first bag-opening component can also be 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 assembly that drives it to move along the x-axis direction.
[0041] 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.
[0042] The bag-pressing component 5 may share components with the first bag-opening component or may be different components. If a second bag-opening component is provided at the bag-opening station, the bag-pressing component 5 may share components with the second bag-opening component or may be different components. The flap 4 adjusts its position corresponding to the opened bag body by changing its own shape or its position on the rotating shaft 44. The flap 4 can be made of deformable material, such as iron wire or shape memory metal, to change its own 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.
[0043] 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. When only one side of the bag-pressing component 5 on 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 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.
[0044] The transverse transmission assembly connected to the opening pull plate 72 and the transverse transmission assembly connected to the rear surface limiting member 3 have basically the same structure. 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 opening pull plate 72 or the rear surface limiting member 3 to move horizontally inward and outward.
[0045] like Figure 9-11 As shown, the bag bottom opening station is also equipped with an inner support plate 931, an outer support plate 932, and a pressing and folding tongue 933. The inner support plate 931 and the outer support plate 932 are respectively located on the outer side of the inner bag bottom piece and the outer bag bottom piece. The inner support plate 931 and the outer support plate 932 cooperate with the bottom support guide 921 to limit the inner bag bottom piece and the outer bag bottom piece and keep them in an unfolded state. The pressing and folding tongue 933 is located on the side of the inner support plate 931 and the outer support plate 932 near the bottom of the bag body. The pressing and folding tongue 933 keeps the folding tongues on both sides of the bag bottom pressed inside the inner support plate 931 and the outer support plate 932 before the inner bag bottom piece is folded inward.
[0046] In one embodiment, 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. 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.
[0047] It also includes a bag bottom pressing station, located behind the bag bottom folding station. The bag bottom pressing station is equipped with a center folding guide, an inner support plate 951 and an outer pressure plate 952. The center folding guide is located inside the bag corresponding to the center fold line. The included angle between the working surfaces of the inner support plate 951 and the outer pressure plate 952 gradually decreases along the conveying direction, and is used to guide the bottom surface of the bag to open and close along the center fold line.
[0048] The center fold guide is a guide rod 953 or a folding turntable 954, or the center fold guide is a guide rod 953 and a folding turntable 954 arranged sequentially along the conveying direction.
[0049] The bottom support guide 921 has a main body that is inserted between the inner bottom sheet and the outer bottom sheet of the bag. The main body extends along the conveying direction to open up the inner bottom sheet and the outer bottom sheet of the bag. A support plate 92 for guiding the opening of the bag bottom is provided on the outer side of the bottom support guide 921.
[0050] The upper surface of the outer support plate 932 has a curved arc.
[0051] Specific workflow: 1. Bag conveying and pre-processing The bag body is sequentially conveyed along bag body conveying path 1 to the bag body forming station and the bag body accordion edge folding station, completing the initial forming and edge folding of the bag body. This part of the structure is a common structure in this field and will not be described in detail here.
[0052] 2. Opening the bag, folding the flap, and folding the bag - Bag opening station: Driven by the bag opening power source 2, the first bag opening component moves along the z-axis and drives the front surface of the bag away from the rear surface by adsorption or pushing, thus realizing the initial opening of the bag.
[0053] - Folding flap station: The folding flaps 4 on both sides swing around the rotating shaft 44 as the central axis, pushing the folding flaps on both sides of the bag bottom into the bag body. The folding flaps 4 can change shape or adjust position according to the position of the bag body to ensure accurate folding.
[0054] - Bag folding station: The bag pressing component 5 acts on at least one of the front and rear surfaces of the bag body, causing the front and rear surfaces of the bag body in the open state to move towards each other. The bag pressing component 5 may share parts with the first bag opening component or the second bag opening component or be different parts. Depending on the positional relationship between the bag folding station and the bag opening station, the bag pressing operation is achieved by connecting to the bag pressing power source or by self-guidance.
[0055] 3. Bag bottom treatment - Pre-opening bag station: The bottom of the bag is pre-opened to prepare for subsequent gluing and bottom folding.
[0056] - Glue Application Station: When the bag body is located at this station, the inner bottom sheet and the outer bottom sheet are parallel and their inner surfaces are opposite to the glue application component 98. The glue application component 98 performs glue application on the inner bottom sheet and the outer bottom sheet. The inner bottom sheet is adhered to the bottom flap, and the outer bottom sheet partially or completely covers and adheres to the outer bottom sheet.
[0057] - Bag bottom opening station: The bottom support guide 921 is inserted between the inner bottom piece and the outer bottom piece before the bag body arrives. The bag bottom is in an open state and the guide guides the inner bottom piece and the outer bottom piece to open. At this time, the folded flap will be pushed outward. At the same time, the rear surface limiting piece or the second opening piece controls the relative movement of the front and rear surfaces of the bag body. The inner support plate 931 and the outer support plate 932 cooperate with the bottom support guide 921 to limit the inner bottom piece and the outer bottom piece. The flap pressing piece 933 presses the flaps on both sides of the bag bottom into the inner side of the support plate.
[0058] - Bag body bottom folding station: The first bottom folding component 941 folds the inner bottom piece of the bag gradually inward from the horizontal to the outer edge along the conveying direction, and the second bottom folding component 942 folds the outer bottom piece of the bag gradually inward from the horizontal to the outer edge along the conveying direction and at least partially covers the outer side of the inner bottom piece of the bag.
[0059] 4. Press the bottom of the bag. After the bottom of the bag is folded, it enters the bag pressing station. The middle fold guide, inner support plate 951 and outer pressing plate 952 work together to guide the open bottom surface of the bag to close up and down along the middle fold line, completing the final forming of the paper bag.
[0060] Through the collaborative work of all the above workstations, the V-bottom paper bag forming equipment achieves an efficient and precise paper bag forming process.
[0061] In the description of this utility model, it should be understood that the inner side of the components on the equipment refers to the bottom of the bag, and the outer side refers to the opening of the bag. The description of the inner and outer sides of the bag is distinguished from the inner and outer sides of the bottom of the bag. When the bag 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 bottom of the bag 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. The terms "center," "length," "width," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component 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, an electric motor, or a cylinder and an electric motor using gear and rack mechanisms, lead screw and nut mechanisms, or slider and guide rail mechanisms 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 indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0062] 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 V-bottom paper bag forming equipment, characterized in that, Includes bag conveying path (1), bag is conveyed along bag conveying path (1) to bag forming station (13), bag gusset edge folding station, bag opening station, flap folding station, bag folding station, pre-opening station, glue application station, bag bottom opening station and bag bottom folding station; Among them, the bag forming station (13) and the bag gusseting station are set up upstream of the bag opening station, and the pre-opening station, glue application station, bag bottom opening station and bag bottom folding station are set down downstream of the bag folding station; the flap folding station and bag folding station are located at the same station as the bag opening 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 a first bag opening component, which is connected to a bag opening power source (2) that drives its z-axis movement and drives the front surface of the bag to move away from the rear surface by adsorption or pushing. The bag bottom opening station is also equipped with a bag folding station and the bag opening station located at the same station. The bag pressing component (5) acts on at least one of the front and rear surfaces of the bag by connecting to the bag pressing power source, so that the front and rear surfaces of the bag in the open state move towards each other. The folding tongue station is equipped with a folding tongue component (4). One end of each of the two folding tongue components (4) is set on the rotating shaft (44), so that the folding tongue component (4) swings around the rotating shaft (44) as the central axis to push the folding tongues on both sides of the bottom of the bag into the bag body. A bag-pressing component (5) is provided at the bag-folding station. The bag-pressing component (5) acts on at least one of the front and rear surfaces of the bag body to make the front and rear surfaces of the bag body in the open state move towards each other. The bottom opening station is equipped with - Bottom support guide (921), the bottom support guide (921) has multiple or has a fork, the bottom support guide (921) is inserted between the inner bottom piece and the outer bottom piece of the bag, the multiple bottom support guides (921) or the fork extend and act on the inner surfaces of the front and rear sides of the bag body to make the bottom of the bag go from flat to the state of being opened on both the front and rear sides, so that the inner bottom piece and the outer bottom piece of the bag unfold; The bag body bottom folding station is equipped with - The first fold bottom piece (941) is located on the outside of the inner bottom piece of the bag, and uses its own extension direction to gradually fold the inner bottom piece of the bag from the horizontal to the outer edge inward along the conveying direction; - The second fold bottom piece (942) is located outside the outer bottom piece of the bag. The second fold bottom piece (942) is located downstream of the first fold bottom piece (941). It folds the outer bottom piece of the bag from horizontal to outer edge inward along the conveying direction and at least partially covers the outer side of the inner bottom piece of the bag. The pre-opening station includes a bag-turning component (97). The bag-turning component (97) turns at least one of the inner bottom piece and the outer bottom piece of the bag outward through its own extension direction. The glue-applying station is equipped with a glue-applying component (98). When the bag body is located at the glue-applying station, the inner bottom piece and the outer bottom piece of the bag are parallel and their inner surfaces are opposite to the glue-applying component (98). When the bag is at the bag bottom opening station and the bag bottom folding station, the conveying direction of the bag is parallel to the extension direction of the bag bottom fold line.
2. The V-bottom paper bag forming equipment according to claim 1, characterized in that: A bag turning station is provided between the bag folding station and the pre-opening station, or between the pre-opening station and the glue application station, or between the glue application station and the bag bottom opening station. The bag turning station is provided with a bag pressing and turning component (11) and a conveying component (12) that cooperate with each other. The bag pressing and turning component (11) and the conveying component (12) are located on both sides perpendicular to the conveying direction, so that the bag body is turned to a side position with the bag bottom opening facing the direction perpendicular to the conveying direction.
3. The V-bottom paper bag forming equipment according to claim 1, characterized in that: If the folding station is located downstream of the opening station, the pressing component (5) acts on at least one of the front and rear surfaces of the bag body through connection to the pressing power source or through its own guidance, causing the front and rear surfaces of the bag body in the opening state to move relative to each other.
4. The V-bottom paper bag forming equipment according to claim 1, characterized in that: The bottom opening station is also equipped with - Inner support plate (931) and outer support plate (932), the inner support plate (931) and the outer support plate (932) are respectively disposed on the outer side of the inner bottom piece and the outer bottom piece of the bag, the inner support plate (931) and the outer support plate (932) cooperate with the bottom support guide (921) to limit the inner bottom piece and the outer bottom piece of the bag and keep them in an unfolded state; - A folding flap (933) is provided on the side of the inner support plate (931) and the outer support plate (932) near the bottom of the bag. The folding flap (933) keeps the flaps on both sides of the bottom of the bag pressed against the inner support plate (931) and the outer support plate (932) before the inner piece of the bottom of the bag is folded inward.
5. The V-bottom paper 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. The flap (4) adjusts the position of the bag body corresponding to the opening by changing its own shape or by setting its position on the rotating shaft (44).
6. The V-bottom paper bag forming equipment according to claim 1, characterized in that: When the front and rear surfaces of the bag pressing component (5) move symmetrically towards each other, its side and the middle crease line of its flap remain on the original plane. When the flap (4) swings, it remains in line with the middle crease line and gradually swings away from the bag body. 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 flap move along the z-axis direction. The flap (4) moves synchronously with the middle crease line and gradually swings away from the bag body.
7. The V-bottom paper bag forming equipment according to claim 1 or 2, 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). The folding tongue (4) is linked with the connecting plate (64). The movement of the connecting plate (64) drives the folding tongue (4) to move.
8. The V-bottom paper bag forming equipment according to claim 1, 6, or 7, 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.
9. The V-bottom paper bag forming equipment according to claim 1, characterized in that: It also includes a bag bottom pressing station, located behind the bag bottom folding station. The bag bottom pressing station is equipped with a center folding guide, an inner support plate (951) and an outer pressure plate (952). The center folding guide is located inside the bag corresponding to the center fold line. The included angle between the working surfaces of the inner support plate (951) and the outer pressure plate (952) gradually decreases along the conveying direction, and is used to guide the bottom surface of the bag to open up and down along the center fold line.
10. The V-bottom paper bag forming equipment according to claim 9, characterized in that: The folding guide is a guide rod (953) or a folding turntable (954), or the folding guide is a guide rod (953) and a folding turntable (954) arranged sequentially along the conveying direction.
11. The V-bottom paper bag forming equipment according to claim 1 or 9, characterized in that: The bottom support guide (921) has a main body that is inserted between the inner bottom sheet and the outer bottom sheet of the bag. The main body extends along the conveying direction to open up the inner bottom sheet and the outer bottom sheet of the bag. A support plate (92) for guiding the opening of the bag bottom is provided on the outside of the bottom support guide (921).
12. The V-bottom paper bag forming equipment according to claim 1, characterized in that: The upper surface of the outer support plate (932) has a curved arc.