Double-layer sheet conveying components, packaging bag reversing devices, and bag making equipment.

Abstract

This utility model discloses a conveying assembly for double-layer sheet material, a reversing device for packaging bags, and a bag-making device, including a first conveying component and a second conveying component. The first conveying component has a first arc-shaped segment, and the second conveying component has a second arc-shaped segment. The first arc-shaped segment is located radially inner to the arc-shaped channel, and the first conveying speed of the first arc-shaped segment is less than the second conveying speed of the second arc-shaped segment. Because the first conveying speed of the first arc-shaped segment is less than the second conveying speed of the second arc-shaped segment, the outermost sheet material layer is conveyed at a faster speed, while the innermost sheet material layer is conveyed at a slower speed. The extra travel distance of the outermost sheet material layer is compensated by the faster conveying speed, allowing the double-layer sheet material to maintain synchronous movement during the arc-shaped conveying process. When applied to bag-making equipment, this avoids the problem of packaging bags being stretched and deformed.

Description

Technical Field

[0001] This utility model relates to the field of bag making machine technology, and in particular to a double-layer sheet material conveying assembly, a packaging bag reversing device, and bag making equipment. Background Technology

[0002] In the fields of sheet material processing and packaging, it is often necessary to transport sheet materials with changing orientations. For example, in bag-making equipment, after the bag body is formed, it usually needs to be changed from a vertical to a horizontal orientation for subsequent processing; in packaging production lines, sheet materials or bags also need to be transported between different workstations with changing angles. When a single layer of sheet material needs to have its orientation changed, an arc-shaped conveyor channel is usually used to guide the sheet material to move along a curved path, thereby achieving the orientation change.

[0003] However, in practical applications, taking bag-making equipment as an example, when a flat bag is guided from a vertical direction to a horizontal direction, the two sidewalls of the bag need to traverse an arc-shaped path. Because the inner radius of the arc-shaped path is smaller and the outer radius is larger, the travel path lengths of the two sidewalls differ. This often results in the outer sidewall lagging behind the inner sidewall, causing the bag to twist and deform, affecting the processing quality of subsequent folding, sealing, and other processes. Similarly, in other applications requiring angle-changing conveying of double-layered sheets, the problem of misalignment of the double-layered sheets due to differences in the inner and outer layer path lengths also exists.

[0004] Therefore, existing sheet material conveying assemblies have the problem of easy misalignment of double-layer sheets when conveying double-layer sheets. Utility Model Content

[0005] The purpose of this application is to solve the problem that double-layer sheet materials are easily misaligned when conveying double-layer sheet materials in the prior art.

[0006] To achieve the above objectives, this application provides a conveying assembly for double-layer sheet material, including a first conveying component and a second conveying component; wherein, the first conveying component has a first arc-shaped segment, the second conveying component has a second arc-shaped segment, the first arc-shaped segment and the second arc-shaped segment are arranged radially spaced apart from each other, forming an arc-shaped channel between them; furthermore, the first arc-shaped segment is located radially inside the arc-shaped channel, and the first conveying speed of the first arc-shaped segment is less than the second conveying speed of the second arc-shaped segment, the first conveying component and the second conveying component respectively drive the corresponding side of the double-layer sheet material in the arc-shaped channel to move, and the double-layer sheet material in the arc-shaped channel moves synchronously.

[0007] Using the above technical solution, the first arc-shaped segment is located radially inner to the arc-shaped channel, and the second arc-shaped segment is located radially outer to the arc-shaped channel, forming an arc-shaped channel for the passage of double-layered sheets. When the double-layered sheets enter the arc-shaped channel, the sheet layer located radially inner traverses a smaller arc-shaped path radius and shorter path length, while the sheet layer located radially outer traverses a larger arc-shaped path radius and longer path length. Because the first conveying speed of the first arc-shaped segment is less than the second conveying speed of the second arc-shaped segment, the sheet layer on the radially outer side is conveyed at a faster speed, while the sheet layer on the radially inner side is conveyed at a slower speed. The extra travel distance of the outer sheet layer is compensated by the faster conveying speed, enabling the double-layered sheets to maintain synchronous movement during the arc-shaped conveying process and avoiding misalignment caused by the different path lengths of the inner and outer layers.

[0008] Furthermore, the first and second arc-shaped segments are arranged radially at intervals, forming an arc-shaped channel that guides and constrains the double-layer sheet material, facilitating stable conveying of the sheet material within the arc-shaped path. In addition, by controlling the conveying speeds of the first and second conveying components separately, the speed difference can be flexibly adjusted according to different arc radii and conveying angles, adapting to various application scenarios.

[0009] According to the double-layer sheet conveying assembly provided in this application, the rotation center of the first arc segment coincides with the rotation center of the second arc segment, and the arc length of the first arc segment is less than the arc length of the second arc segment.

[0010] By adopting the above technical solution, the rotation centers of the first and second arc segments coincide, allowing the two arc segments to rotate around the same axis, resulting in a compact structure and coordinated movement. The arc length of the first arc segment is smaller than that of the second arc segment, consistent with the geometric characteristics of the first arc segment being located radially inward and having a smaller radius, thus improving the synchronization of the sheet materials on both sides during conveying.

[0011] Furthermore, the coincidence of the rotation centers allows the first and second transfer components to rotate synchronously via the same drive source or coaxial transmission structure, which helps simplify the drive structure. In addition, the matching of the arc length difference with the radius difference ensures that the arc-shaped channel maintains a uniform radial spacing throughout its entire arc extension range, which is beneficial for the stable transport of the double-layer sheet material within the arc-shaped channel.

[0012] According to the double-layer sheet conveying assembly provided in this application, the first conveying component includes a first dragging part movably disposed along the extension direction of the first arc segment, and the second conveying component includes a second dragging part movably disposed along the extension direction of the second arc segment; wherein the first dragging part and the second dragging part respectively drag the double-layer sheet in the arc channel to move synchronously.

[0013] Using the above technical solution, the first and second dragging parts are movably arranged along their respective arc-shaped extension directions, enabling them to directly contact the double-layer sheet material and apply dragging force to achieve active conveying of the sheet material. The first dragging part drags the radially inner sheet material layer, and the second dragging part drags the radially outer sheet material layer. The two drag the corresponding sheet material layers at different conveying speeds, so that the double-layer sheet material maintains synchronous movement within the arc-shaped channel.

[0014] In addition, by having the dragging part directly contact the sheet material and apply dragging force, the slippage and offset of the sheet material in the arc-shaped channel can be reduced, which helps to improve the reliability of the conveying.

[0015] In addition, the first and second drag sections are set independently, and their respective moving speeds can be controlled separately, which facilitates differentiated adjustment of the conveying speed of the inner and outer sheet materials.

[0016] According to the double-layer sheet conveying assembly provided in this application, the first conveying component includes a first rotating support portion, and the second conveying component includes a second rotating support portion coaxially disposed with the first rotating support portion. The outer diameter of the first rotating support portion is smaller than the outer diameter of the second rotating support portion. A first arc-shaped segment is formed on one outer periphery of the first rotating support portion, and a second arc-shaped segment is formed on the same inner periphery of the second rotating support portion. Furthermore, a first dragging portion is configured as a first conveyor belt surrounding the outer periphery of the portion containing the first arc-shaped segment on the first rotating support portion, and a second dragging portion is configured as a second conveyor belt surrounding the outer periphery of the portion containing the second arc-shaped segment on the second rotating support portion. The first conveyor belt and the second conveyor belt form an arc-shaped channel at the radial gap in the arc-shaped portion, and the first conveyor belt rubs against the sheet material on the radially inner side of the arc-shaped channel, while the second conveyor belt rubs against the sheet material on the radially outer side of the arc-shaped channel.

[0017] Using the above technical solution, the first rotating support and the second rotating support are coaxially arranged with different outer diameters. The first rotating support has a smaller outer diameter and is located radially inner, while the second rotating support has a larger outer diameter and is located radially outer. The difference in radial dimensions between the two naturally forms the radial spacing required for the arc-shaped channel. The first conveyor belt surrounds the outer periphery of the first rotating support, and the second conveyor belt surrounds the outer periphery of the second rotating support. The radial gap between the two conveyor belts at the arc-shaped part is the arc-shaped channel. The first conveyor belt makes frictional contact with the radially inner sheet material, and the second conveyor belt makes frictional contact with the radially outer sheet material, thereby dragging the inner and outer layers of sheet material through friction.

[0018] Furthermore, the conveyor belt, acting as the driving component, provides a continuous and uniform frictional contact surface, ensuring even force distribution on the sheet material along the curved path and reducing localized stress concentration. In addition, the first and second rotating support sections are coaxially arranged, enabling them to rotate synchronously via the same axis, resulting in a compact structure.

[0019] According to the double-layer sheet conveying assembly provided in this application, the first drag part and the second drag part have the same rotational angular velocity in the arc-shaped part, and the central angle of the first arc segment is equal to the central angle of the second arc segment.

[0020] Using the above technical solution, the first driving part and the second driving part have the same rotational angular velocity in the arc section. Since the radius of the first arc section is smaller than the radius of the second arc section, the linear velocity of the first conveyor belt is naturally smaller than the linear velocity of the second conveyor belt under the same angular velocity, thereby achieving the effect that the first conveying speed is smaller than the second conveying speed, without the need to set up an additional differential mechanism.

[0021] Furthermore, the central angles of the first and second arc segments are equal, ensuring that both arc segments cover the same range of rotational angles at the same angular velocity, maintaining a continuous and complete guiding function throughout the entire central angle range. In addition, the constant angular velocity design allows the first and second conveyor belts to be driven by the same drive source via coaxial transmission, simplifying the drive system. The equal central angle design also contributes to the geometric symmetry at the entrance and exit of the arc channel, ensuring consistent stress states for the double-layer sheet material as it enters and exits the arc channel, reducing disturbance in the transition area.

[0022] According to the double-layer sheet conveying assembly provided in this application, the first rotating support and the second rotating support are arranged adjacent to each other along the axial direction, and a radial step space is formed between the first rotating support and the second rotating support.

[0023] Using the above technical solution, the first rotating support and the second rotating support are arranged adjacent to each other along the axial direction, making the structure more compact. Since the outer diameter of the first rotating support is smaller than that of the second rotating support, a radial step space is naturally formed at the junction when they are arranged adjacent to each other. This step space provides a structural basis for the radially spaced distribution of the first and second conveyor belts, allowing the arc-shaped channel to be formed at the radial step, ensuring that the sheet material can always be within the step space during conveying, thus achieving axial positioning.

[0024] Furthermore, the axially adjacent arrangement allows the first and second rotating supports to be installed as a single unit via axial connection, facilitating assembly and disassembly. In addition, the radial stepped space can be formed without additional partitions, utilizing the dimensional difference between the two rotating supports themselves, thus reducing manufacturing complexity.

[0025] According to the double-layer sheet conveying assembly provided in this application, the first rotating support is configured as a support roller, and the second rotating support is configured as a support flange detachably connected to both ends of the support roller, wherein the outer diameter of the support flange is larger than the outer diameter of the support roller; the first conveyor belt is wound around one side of the outer periphery of the support roller, and the second conveyor belt is wound around the same side of the outer periphery of the two support flanges and covers the support roller in the axial direction; wherein, the side wall of the first conveyor belt facing the second conveyor belt is in frictional contact with the radially inner side wall of the sheet, and the side wall of the second conveyor belt facing the first conveyor belt is in frictional contact with the radially outer side wall of the sheet.

[0026] Using the above technical solution, the first rotating support part adopts a support roller, and the second rotating support part adopts a support flange. The support flange is detachably connected to both ends of the support roller, forming a modular structure. The outer diameter of the support flange is larger than the outer diameter of the support roller. When the first conveyor belt is wound around the outer circumference of the support roller and the second conveyor belt is wound around the outer circumference of the support flange, the two conveyor belts form a height difference in the radial direction, thereby constituting the radial spacing of the arc-shaped channel. In addition, the detachably connected support flange allows for the replacement of flanges with different outer diameters according to different sheet thicknesses and arc-shaped channel spacing requirements, improving the adaptability of the equipment. Furthermore, the first and second conveyor belts respectively rub against the sidewalls of the sheet material, with the contact surface located on the side of the conveyor belt rather than its surface, enabling more stable clamping and dragging of the sheet material.

[0027] According to the double-layer sheet conveying assembly provided in this application, the first conveying speed is less than the second conveying speed, and the difference between the two is V; wherein, V is calculated by the following formula: V=W2*R2-W1*R1; where W1 is the rotational angular velocity of the first conveying component along the first arc segment; R1 is the radius of the arc where the first arc segment is located; W2 is the rotational angular velocity of the second conveying component along the second arc segment; and R2 is the radius of the arc where the second arc segment is located.

[0028] Using the above technical solution, the difference between the first and second conveying speeds is quantified using the formula V=W2*R2-W1*R1, allowing the speed difference to be accurately set based on the geometric and motion parameters of the arc segment. Here, the product of W1 and R1 is the linear velocity at the first arc segment (i.e., the first conveying speed), and the product of W2 and R2 is the linear velocity at the second arc segment (i.e., the second conveying speed). The difference between the two is the speed difference required to compensate for the difference in path length between the inner and outer layers. Furthermore, quantifying the speed difference improves the synchronization accuracy of the double-layer sheet material, reducing misalignment caused by speed mismatch.

[0029] This application also provides a reversing device for a packaging bag, the packaging bag including at least two layers of sidewalls stacked along its thickness direction; and also including the above-mentioned double-layer sheet material conveying assembly; wherein, the packaging bag is conveyed to the inlet of the conveying assembly along a first direction, the conveying assembly receives the packaging bag, and a first transfer component moves one sidewall of the packaging bag along the extension direction of a first arc segment, and a second transfer component moves the other sidewall of the packaging bag along the extension direction of a second arc segment, so that the packaging bag is conveyed outward from the outlet of the reversing device along a second direction; wherein, the second direction and the first direction are inclined at a preset angle to each other.

[0030] Using the above technical solution, the two sidewalls of the packaging bag are dragged by the first and second conveying components respectively, achieving directional change along an arc-shaped path. Since the first conveying speed is lower than the second conveying speed, the two sidewalls remain synchronized during the arc-shaped conveying process, avoiding sidewall misalignment and bag twisting caused by differences in path length. The packaging bag enters from the first direction and exits along the second direction, achieving the function of directional change. Furthermore, this reversing device utilizes the differential conveying principle of the double-layer sheet material conveying assembly, ensuring that the two sidewalls of the packaging bag remain aligned during the reversing process, which helps improve the processing quality of subsequent processes. In addition, the preset included angle can be flexibly set according to the actual production line layout, allowing the reversing device to adapt to different directional change requirements.

[0031] According to the reversing device for the packaging bag provided in this application, the preset included angle is set within the range of 60 degrees to 120 degrees, and the central angle of the first arc segment, the central angle of the second arc segment, and the preset included angle are equal to each other.

[0032] Using the above technical solution, the preset included angle is set within the range of 60 to 120 degrees, covering common direction change angles, including typical application scenarios such as 90-degree reversals. The central angles of the first arc segment and the second arc segment are equal to the preset included angle, ensuring that the bending angle of the arc channel is consistent with the direction change angle. The packaging bag is continuously and completely guided throughout the entire arc path, resulting in a smooth transition from the entrance to the exit.

[0033] Furthermore, the design with three equal angles ensures that the tangent direction at the entrance of the arc-shaped channel is consistent with the first direction, and the tangent direction at the exit is consistent with the second direction. This eliminates the need for additional deflection when the sheet material enters and leaves the arc-shaped channel, reducing stress concentration in the transition area. In addition, the angle range of 60 to 120 degrees allows for large-angle directional changes without increasing the resistance of sheet material conveying due to excessive bending.

[0034] The reversing device for packaging bags provided in this application further includes a bag receiving component disposed at the inlet of the conveying component and a bag output component disposed at the outlet of the conveying component. The bag receiving component receives the packaging bag along a first direction at a first preset speed and moves it to the inlet of the conveying component; the bag output component moves the packaging bag from the outlet of the conveying component to the next station along a second direction at a second preset speed.

[0035] Using the above technical solution, the bag receiving component receives the packaging bag at the inlet along a first direction and transfers it to the inlet of the conveying component. The bag output component transfers the packaging bag to the next station at the outlet along a second direction. The bag receiving component and the bag output component are connected to the inlet and outlet of the conveying component, respectively, ensuring stable conveying support for the packaging bag before and after the reversal, further reducing positional deviation during the reversal process. Furthermore, the bag receiving component conveys along the first direction, and the bag output component conveys along the second direction, aligning with the conveying directions before and after the reversal, which helps the packaging bag operate smoothly in the transition area. In addition, the independent receiving and output components allow the reversing device to flexibly connect with upstream and downstream equipment, facilitating production line layout.

[0036] According to the reversing device for the packaging bag provided in this application, the first preset speed is less than or equal to the first conveying speed, and the second preset speed is greater than or equal to the first conveying speed.

[0037] Using the above technical solution, the first preset speed is less than or equal to the first conveying speed, causing the packaging bag to undergo an acceleration process when entering the conveying component from the bag receiving component. This helps the sheet material smoothly enter the arc-shaped channel and adhere tightly to the inner wall of the arc-shaped channel. The second preset speed is greater than or equal to the first conveying speed, causing the packaging bag to undergo an acceleration process when entering the bag output component from the conveying component outlet. This helps the sheet material to be smoothly discharged from the arc-shaped channel and avoids accumulation at the outlet. In addition, the speed gradient design of inlet acceleration and outlet acceleration ensures that the packaging bag remains taut within the arc-shaped channel, reducing slack and wrinkles in the sheet material. Furthermore, by setting different speed gradients, it is possible to adapt to the conveying needs of packaging bags of different materials and thicknesses.

[0038] This application also provides a bag-making device, including a bag forming assembly, a bag folding assembly, and a reversing device for the aforementioned packaging bag arranged sequentially from top to bottom in a vertical direction, wherein the first direction is vertical and the second direction is horizontal; wherein, the bag forming assembly receives sheet material and forms the received sheet material into a three-dimensional bag; the bag folding assembly is located downstream of the bag forming assembly, receives the three-dimensional bag from the bag forming assembly, and folds the bag body of the three-dimensional bag into a flat shape; the reversing device receives the flat bag body along the first direction and conveys it out along the second direction.

[0039] Using the above technical solution, the bag-making equipment is arranged vertically from top to bottom as a bag forming assembly, a bag folding assembly, and a reversing device, forming a complete bag-making process of forming, folding, and reversing three-dimensional bags. The bag forming assembly forms the sheet material into a three-dimensional bag, the bag folding assembly folds the three-dimensional bag into a flat shape, and the reversing device converts the flat bag from a vertical direction to a horizontal direction for output, facilitating subsequent horizontal processes such as sealing and collection. Furthermore, the reversing device utilizes the differential speed conveying principle to keep the two sidewalls of the bag aligned during the reversing process, contributing to the quality of subsequent processing. In addition, the vertical arrangement results in a smaller footprint and higher space utilization. Moreover, the reversing device converts the bag from vertical to horizontal, allowing subsequent processes to be performed on a horizontal plane, facilitating operation and observation.

[0040] According to the bag making equipment provided in this application, a bag alignment part is also provided between the inlet end of the bag folding assembly and the outlet end of the bag forming assembly. The bag alignment part extends in the vertical direction, the inlet end is adapted and aligned with the outlet end of the bag forming assembly in the vertical direction, and the outlet end is adapted and aligned with the inlet end of the bag folding assembly in the vertical direction, thereby aligning the side wall of the three-dimensional bag with the inlet end of the bag folding assembly.

[0041] Using the above technical solution, the bag alignment section is located between the bag forming assembly and the bag folding assembly, extending vertically. Its inlet end is aligned with the outlet end of the bag forming assembly, and its outlet end is aligned with the inlet end of the bag folding assembly. This ensures that after the 3D bag is output from the forming assembly, it is guided by the alignment section, and its sidewall aligns with the inlet end of the folding assembly before entering the folding process. Furthermore, the bag alignment section serves as a transition guide and alignment correction, reducing positional offset during the transition from forming to folding. In addition, the alignment section extends vertically, consistent with the bag's conveying direction, and does not change the bag's conveying direction, only correcting its position. Moreover, the alignment section helps improve the processing accuracy of the folding process and reduces defective folded products caused by bag misalignment. Attached Figure Description

[0042] Figure 1 A first-view perspective three-dimensional structural diagram of the double-layer sheet conveying assembly provided in an embodiment of this utility model;

[0043] Figure 2 A two-dimensional structural schematic diagram of the double-layer sheet conveying assembly provided in an embodiment of the present utility model from a second perspective;

[0044] Figure 3 A schematic diagram of the arc-shaped channel in the double-layer sheet conveying assembly provided in this embodiment of the utility model;

[0045] Figure 4A front view of the rotating support portion in the double-layer sheet conveying assembly provided in this embodiment of the utility model;

[0046] Figure 5 A three-dimensional structural diagram of the rotating support part in the double-layer sheet conveying assembly provided in this embodiment of the utility model;

[0047] Figure 6 A front view structural schematic diagram of the reversing device for a packaging bag provided in an embodiment of this utility model;

[0048] Figure 7 A three-dimensional structural schematic diagram of the reversing device for a packaging bag provided in an embodiment of this utility model;

[0049] Figure 8 This is a front view structural diagram of the bag-making equipment provided in an embodiment of the present utility model.

[0050] Explanation of reference numerals in the attached figures:

[0051] A. First direction; B. Second direction;

[0052] 1. Reversing device for packaging bags;

[0053] 10. First transfer component; 100. First arc-shaped segment; 110. First dragging part; 120. First rotating support part;

[0054] 20. Second transfer component; 200. Second arc-shaped segment; 210. Second dragging part; 220. Second rotating support part;

[0055] 30. Arc-shaped passage; 310. Radial stepped space;

[0056] 40. Bag receiving assembly;

[0057] 50. Bag output assembly;

[0058] 60. Bag forming components;

[0059] 70. Bag body folding assembly;

[0060] 80. Alignment of the bag body. Detailed Implementation

[0061] In sheet material processing and packaging, misalignment is prone to occur when double-layer sheets are conveyed at an angle. Specifically, when two stacked sheets are conveyed along an arc-shaped path to achieve a change of direction, the inner and outer sheet layers traverse different radii of the arc path—the inner path is shorter and the outer path is longer. If the two layers are conveyed at the same linear velocity, the outer sheet layer will lag behind the inner sheet layer due to its longer path, resulting in relative misalignment between the two layers. In bag-making equipment, when the bag changes direction from vertical to horizontal, the two sidewalls of the bag traverse an arc-shaped path. If the two sidewalls are not synchronized, it will cause the bag to twist and deform, affecting the processing quality of subsequent folding, sealing, and other processes. Similarly, in other scenarios requiring angle-changing conveying of double-layer sheets, the problem of misalignment due to the difference in path length between the inner and outer layers also exists.

[0062] To address this, this application provides a conveying assembly for double-layer sheet materials. By setting a first conveying component and a second conveying component with different conveying speeds, the first arc-shaped segment is located radially inner to the arc-shaped channel and has a lower conveying speed, while the second arc-shaped segment is located radially outer to the arc-shaped channel and has a higher conveying speed. This allows the outer sheet material layer to be conveyed at a faster speed, while the inner sheet material layer is conveyed at a slower speed. The extra travel distance of the outer sheet material layer is compensated by the faster conveying speed, thereby ensuring that the double-layer sheet materials remain synchronized during arc-shaped conveying and solving the technical problem of easy misalignment of double-layer sheet materials during angular conveying.

[0063] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0064] The double-layer sheet conveying assembly provided in this application, such as Figures 1 to 3 As shown, the device includes a first transfer component 10 and a second transfer component 20. The first transfer component 10 has a first arc-shaped segment 100, and the second transfer component 20 has a second arc-shaped segment 200. The first arc-shaped segment 100 and the second arc-shaped segment 200 are arranged radially at intervals, forming an arc-shaped channel 30 between them. The first arc-shaped segment 100 is located radially inside the arc-shaped channel 30, and the first transfer speed of the first arc-shaped segment 100 is less than the second transfer speed of the second arc-shaped segment 200. The first transfer component 10 and the second transfer component 20 respectively drive the corresponding side of the double-layer sheet material in the arc-shaped channel to move, and the double-layer sheet material in the arc-shaped channel 30 moves synchronously.

[0065] Specifically, the first transfer component 10 is used to transfer the radially inner sheet layer of the double-layer sheet material. It has a first arc-shaped segment 100 extending along an arc-shaped path to guide the inner sheet layer to move along the arc-shaped path. The second transfer component 20 is used to transfer the radially outer sheet layer of the double-layer sheet material. It has a second arc-shaped segment 200 extending along an arc-shaped path to guide the outer sheet layer to move along the arc-shaped path. The arc-shaped channel 30 is formed by the first arc-shaped segment 100 and the second arc-shaped segment 200 arranged radially at intervals. It is a channel space through which the double-layer sheet material passes, with its radially inner side defined by the first arc-shaped segment 100 and its radially outer side defined by the second arc-shaped segment 200.

[0066] In use, after the double-layer sheet material enters the arc-shaped channel 30, the inner sheet material layer moves along the first arc-shaped section 100 at a first conveying speed, while the outer sheet material layer moves along the second arc-shaped section 200 at a second conveying speed. Because the radius of the first arc-shaped section 100 is smaller, the path length of the inner sheet material layer is shorter; the radius of the second arc-shaped section 200 is larger, and the path length of the outer sheet material layer is longer. The first conveying speed is lower than the second conveying speed, and the faster conveying speed of the outer sheet material layer compensates for its longer path length, ensuring that the two layers of sheet material remain aligned within the arc-shaped channel 30. This achieves synchronous movement of the double-layer sheet material during angular conveying, avoiding misalignment.

[0067] This application does not limit the specific structure and arrangement of the first transfer component 10 and the second transfer component 20, for example:

[0068] In one embodiment, the first transfer component 10 and the second transfer component 20 can each be an arc-shaped conveyor belt mechanism. The first and second arc-shaped conveyor belts are driven by independent drive motors, and the first transfer speed is lower than the second transfer speed by setting different drive speeds. The two conveyor belts are arranged radially at intervals, forming an arc-shaped channel 30 in the middle. The inner sheet material layer is attached to the first arc-shaped conveyor belt, and the outer sheet material layer is attached to the second arc-shaped conveyor belt, and they are dragged by friction respectively.

[0069] In another embodiment, the first transfer component 10 and the second transfer component 20 can each be an arc-shaped chain conveyor mechanism. Clamping claws are spaced apart on the chain. The clamping claws on the first arc-shaped chain clamp the edge of the inner sheet material layer, and the clamping claws on the second arc-shaped chain clamp the edge of the outer sheet material layer. The movement of the chain drives the sheet material to move along an arc-shaped path. The sprocket radius of the first arc-shaped chain is smaller than that of the second arc-shaped chain, and at the same rotational speed, the linear velocity of the first arc-shaped chain is smaller than that of the second arc-shaped chain.

[0070] In another embodiment, the first transfer component 10 and the second transfer component 20 can also be respectively arc-shaped roller group conveying mechanisms, with multiple rollers arranged along an arc-shaped path. The arrangement radius of the first arc-shaped roller group is smaller than that of the second arc-shaped roller group. The first arc-shaped roller group is driven by a motor with a lower rotational speed, and the second arc-shaped roller group is driven by a motor with a higher rotational speed, so that the inner sheet material layer moves at a slower speed on the lower rotational roller group, and the outer sheet material layer moves at a faster speed on the higher rotational roller group.

[0071] Based on the above-mentioned double-layer sheet conveying assembly provided in this application, such as Figures 1 to 3 As shown, the rotation center of the first arc segment 100 coincides with the rotation center of the second arc segment 200, and the arc length of the first arc segment 100 is less than the arc length of the second arc segment 200.

[0072] Specifically, the coincidence of the rotation centers allows the first transfer component 10 and the second transfer component 20 to rotate around the same axis, resulting in coordinated movement and a compact structure. The difference in arc length is matched with the difference in radius, ensuring that the arc-shaped channel 30 maintains a uniform radial spacing throughout its arc extension range, which is beneficial for the stable conveying of the double-layer sheet material.

[0073] This application does not limit the implementation method of the rotation center, for example:

[0074] In one embodiment, the first arc segment 100 and the second arc segment 200 are respectively formed on two coaxially arranged rotating support members. The two rotating support members are driven by the same rotating shaft, so that their rotation centers coincide. The outer diameter of the first rotating support member is smaller and the outer diameter of the second rotating support member is larger. Under the same central angle, the arc length of the first arc segment 100 is smaller than the arc length of the second arc segment 200.

[0075] In another embodiment, the first arc segment 100 and the second arc segment 200 are respectively formed on two independent arc guide rails. The two arc guide rails are coaxially rotated by gear transmission or synchronous belt transmission. The bending radius of the first arc guide rail is smaller than that of the second arc guide rail, so that their rotation centers coincide and their arc lengths are different.

[0076] In another embodiment, the first arc segment 100 and the second arc segment 200 are integrated on different radii of the same rotating body. The first arc segment 100 is formed on the inner side of the rotating body and the second arc segment 200 is formed on the outer side. Both rotate around the central axis of the rotating body itself.

[0077] Based on the above-mentioned double-layer sheet conveying assembly provided in this application, such as Figures 1 to 3As shown, the first transfer component 10 includes a first drag part 110 movably disposed along the extension direction of the first arc segment 100, and the second transfer component 20 includes a second drag part 210 movably disposed along the extension direction of the second arc segment 200; wherein, the first drag part 110 and the second drag part 210 respectively drag the double-layer sheet material in the arc channel 30 to move synchronously.

[0078] Specifically, the first dragging part 110 is the portion of the first transfer member 10 that directly contacts the inner sheet material layer and applies dragging force. It is movably arranged along the extension direction of the first arc segment 100 and can adopt a structure such as a conveyor belt, chain gripper, or roller. The second dragging part 210 is the portion of the second transfer member 20 that directly contacts the outer sheet material layer and applies dragging force. It is movably arranged along the extension direction of the second arc segment 200 and can adopt a structure that is the same as or different from that of the first dragging part 110.

[0079] In use, the first dragging part 110 and the second dragging part 210 directly contact and drag the corresponding sheet material layers, respectively, and achieve differential speed transfer of the inner and outer sheet materials through the difference in their respective moving speeds. The direct contact between the dragging part and the sheet material provides active dragging force, reduces the passive sliding of the sheet material in the arc-shaped channel 30, and helps to maintain the stability of the sheet material's position.

[0080] This application does not limit the specific structure and arrangement of the first drag unit 110 and the second drag unit 210, for example:

[0081] In one embodiment, the first drag section 110 and the second drag section 210 are both annular conveyor belts. The first conveyor belt moves in a circular motion along the extension direction of the first arc segment 100, and the second conveyor belt moves in a circular motion along the extension direction of the second arc segment 200. The surface of the conveyor belts is in frictional contact with the sheet material, and the sheet material is dragged by friction. The moving speed of the first conveyor belt is less than the moving speed of the second conveyor belt.

[0082] In another embodiment, the first dragging part 110 and the second dragging part 210 can each be a chain belt clamping assembly. The chain runs along the extension direction of the arc segment, and clamping claws are spaced apart on the chain. The clamping claws clamp the edge of the sheet material and drag the sheet material as the chain moves. The running speed of the first chain is less than the running speed of the second chain.

[0083] In another embodiment, the first drag unit 110 and the second drag unit 210 are respectively rotating roller groups, with multiple rollers arranged along the extension direction of the arc segment. The roller surfaces are in contact with the sheet material, and the sheet material is dragged by the rotational friction of the rollers. The rotational linear velocity of the first roller group is less than that of the second roller group.

[0084] Based on the above-mentioned double-layer sheet conveying assembly provided in this application, such as Figures 1 to 5As shown, the first transfer component 10 includes a first rotating support portion 120, and the second transfer component 20 includes a second rotating support portion 220 coaxially disposed with the first rotating support portion 120. The outer diameter of the first rotating support portion 120 is smaller than the outer diameter of the second rotating support portion 220. A first arc-shaped segment 100 is formed on one outer periphery of the first rotating support portion 120, and a second arc-shaped segment 200 is formed on the same inner periphery of the second rotating support portion 220. Furthermore, the first drag portion 110 is configured as a first conveyor belt surrounding the outer periphery of the portion containing the first arc-shaped segment 100 on the first rotating support portion 120, and the second drag portion 210 is configured as a second conveyor belt surrounding the outer periphery of the portion containing the second arc-shaped segment 200 on the second rotating support portion 220. The radial gap between the first conveyor belt and the second conveyor belt at the arc-shaped portion forms an arc-shaped channel 30, and the first conveyor belt rubs against the sheet material on the radially inner side of the arc-shaped channel 30, while the second conveyor belt rubs against the sheet material on the radially outer side of the arc-shaped channel 30.

[0085] Specifically, the first rotating support 120 is a component in the first transfer member 10 that provides rotating support and an arc-shaped carrier segment, and can adopt a structure such as a cylindrical roller or a frustum conical. The second rotating support 220 is a component in the second transfer member 20 that provides rotating support and an arc-shaped carrier segment, and is coaxially arranged with the first rotating support 120. The outer diameter of the first rotating support 120 is smaller than the outer diameter of the second rotating support 220, creating a height difference between the two in the radial direction. The first conveyor belt is an annular belt component wrapped around the outer periphery of the first rotating support 120, and the second conveyor belt is an annular belt component wrapped around the outer periphery of the second rotating support 220; both can be made of materials with a high coefficient of friction, such as rubber belts or polyurethane belts.

[0086] In use, the first rotating support 120 and the second rotating support 220 are coaxially arranged with different outer diameters. The first conveyor belt is wound around the outer circumference of the first rotating support 120 with a smaller outer diameter, and the second conveyor belt is wound around the outer circumference of the second rotating support 220 with a larger outer diameter. The two conveyor belts have a height difference in the radial direction, and the radial gap between them is the arc-shaped channel 30. The first conveyor belt is in frictional contact with the inner sheet material, and the second conveyor belt is in frictional contact with the outer sheet material. When the rotating support rotates, it drives the conveyor belts to move, dragging the inner and outer sheet materials respectively through friction. Because the outer diameter of the first rotating support 120 is smaller, the linear velocity of the first conveyor belt is less than that of the second conveyor belt at the same angular velocity, thereby achieving differential speed conveying.

[0087] This application does not limit the specific structure and arrangement of the first rotating support 120 and the second rotating support 220, for example:

[0088] In one embodiment, the first rotating support 120 is a cylindrical roller, and the second rotating support 220 is a cylindrical roller with a larger outer diameter; both are coaxially mounted on the same rotating shaft. The first conveyor belt and the second conveyor belt are both rubber annular belts, respectively fitted around the outer circumference of the two rollers on the same side. The difference in the outer diameter of the two rollers is the radial distance of the arc-shaped channel 30.

[0089] In another embodiment, the first rotating support 120 is a frustum-shaped roller, and the second rotating support 220 is a frustum-shaped roller with a larger outer diameter. The large ends of the two rollers are opposite each other and coaxially arranged. The outer circumferential surface of the frustum-shaped roller is conical, which allows the conveyor belt to automatically center itself when running on the conical surface, reducing deviation. The first conveyor belt and the second conveyor belt run on the two conical surfaces respectively, and the radial gap between them forms an arc-shaped channel 30.

[0090] In another embodiment, the first rotating support 120 can be a smaller diameter segment of a multi-segment stepped shaft, and the second rotating support 220 can be a larger diameter segment of the same stepped shaft, wherein the stepped shaft is a one-piece molded structure. The first conveyor belt is wound around the outer periphery of the smaller diameter segment, and the second conveyor belt is wound around the outer periphery of the larger diameter segment. When the stepped shaft rotates, the two conveyor belts run at different linear speeds.

[0091] Based on the above-mentioned double-layer sheet conveying assembly provided in this application, such as Figures 1 to 5 As shown, the first dragging part 110 and the second dragging part 210 have the same rotational angular velocity in the arc-shaped part, and the central angle of the first arc segment 100 is equal to the central angle of the second arc segment 200.

[0092] Rotational angular velocity is the angular velocity of the drag unit as it rotates around the center of rotation in the arc-shaped section. Central angle is the central angle corresponding to the arc segment.

[0093] In use, at the same angular velocity, because the radius of the first arc segment 100 is smaller than the radius of the second arc segment 200, the linear velocity of the first conveyor belt (i.e., the first conveying speed) is naturally smaller than the linear velocity of the second conveyor belt (i.e., the second conveying speed), thus achieving differential conveying without the need for an additional differential mechanism. The design of equal central angles allows the arc channel 30 to cover the complete directional change angle from the inlet to the outlet, ensuring continuous guidance of the sheet material throughout the entire arc path.

[0094] This application does not limit the implementation method of constant angular velocity and constant central angle, for example:

[0095] In one embodiment, the first rotating support 120 and the second rotating support 220 are coaxially driven by the same drive motor via a reducer, and both have the same rotational angular velocity. The central angles of the first arc segment 100 and the second arc segment 200 can both be set to 90 degrees, so that the arc channel 30 can achieve a 90-degree directional change.

[0096] In another embodiment, the first rotating support 120 and the second rotating support 220 are connected to the same drive source via a synchronous belt with a transmission ratio of 1:1, ensuring that their rotational angular velocities are the same. The central angles of the first arc segment 100 and the second arc segment 200 can both be set to 60 degrees, suitable for scenarios involving small-angle directional changes.

[0097] In another embodiment, the first rotating support 120 and the second rotating support 220 achieve coaxial synchronous rotation through gear transmission. The central angle of the two arc segments can be set to 120 degrees, which is suitable for scenarios with large-angle directional changes.

[0098] Based on the above-mentioned double-layer sheet conveying assembly provided in this application, such as Figures 4 to 5 As shown, the first rotating support portion 120 and the second rotating support portion 220 are arranged adjacent to each other along the axial direction, and a radial stepped space 310 is formed between the first rotating support portion 120 and the second rotating support portion 220.

[0099] Specifically, the axially adjacent arrangement means that the first rotating support 120 and the second rotating support 220 are arranged along the axial direction of the rotation axis, and there is a junction between their adjacent end faces. The radial step space 310 is the space formed by the radial height difference generated at the junction of the first rotating support 120 and the second rotating support 220, due to the smaller outer diameter of the first rotating support 120 compared to the outer diameter of the second rotating support 220.

[0100] More specifically, the axially adjacent arrangement allows the two rotating support parts to be arranged axially, resulting in a compact structure. Due to the difference in outer diameter, a radial step is naturally formed at their junction, which provides the structural basis for the radially spaced distribution of the first and second conveyor belts. The first conveyor belt is located on the lower side of the step (outer periphery of the first rotating support part 120), and the second conveyor belt is located on the higher side of the step (outer periphery of the second rotating support part 220). The radial height difference between them is the radial spacing of the arc-shaped channel 30.

[0101] This application is not limited to the implementation methods of axially adjacent arrangement and radial steps, for example:

[0102] In one embodiment, the first rotating support 120 and the second rotating support 220 are coaxially arranged cylindrical rollers, which are adjacent to each other on the upper end face in the axial direction and are fixed on the same rotating shaft by key connection.

[0103] In another embodiment, the first rotating support 120 and the second rotating support 220 are two shaft segments with different diameters on the same stepped shaft. The stepped shaft is integrally machined, and the two shaft segments are connected by a conical transition. The conical transition area is the radial step space 310.

[0104] In another embodiment, the first rotating support 120 and the second rotating support 220 are independent hollow rollers, coaxially connected by a flange and bolts. The two rollers have different outer diameters, forming a radial step at the flange after connection. The detachable connection facilitates maintenance and replacement.

[0105] Based on the above-mentioned double-layer sheet conveying assembly provided in this application, such as Figures 4 to 5 As shown, the first rotating support part 120 is configured as a support roller, and the second rotating support part 220 is configured as a support flange detachably connected to both ends of the support roller. The outer diameter of the support flange is larger than the outer diameter of the support roller. The first conveyor belt is wound around one side of the outer periphery of the support roller, and the second conveyor belt is wound around the same side of the outer periphery of the two support flanges and covers the support roller in the axial direction. The side wall of the first conveyor belt facing the second conveyor belt is in frictional contact with the radially inner side wall of the sheet material, and the side wall of the second conveyor belt facing the first conveyor belt is in frictional contact with the radially outer side wall of the sheet material.

[0106] Specifically, the support roller is used to support the first conveyor belt and provide rotational motion. The support flange can be a disc-shaped flange component, detachably connected to both ends of the support roller, and its outer diameter is larger than the outer diameter of the support roller. The side wall of the first conveyor belt facing the second conveyor belt is the radially outward side wall of the first conveyor belt, which contacts the side wall of the inner sheet material. The side wall of the second conveyor belt facing the first conveyor belt is the radially inward side wall of the second conveyor belt, which contacts the side wall of the outer sheet material.

[0107] More specifically, the outer diameter of the support roller is smaller, and the first conveyor belt is wound around its outer circumference, forming a radially inner conveying surface. The outer diameter of the support flange is larger, and the second conveyor belt is wound around the same side of the outer circumference of the two support flanges, forming a radially outer conveying surface. Because the outer diameter of the support flange is larger than that of the support roller, the running radius of the second conveyor belt is larger than that of the first conveyor belt, and at the same angular velocity, the linear velocity of the second conveyor belt is greater than that of the first conveyor belt. The second conveyor belt covers the support roller in the axial direction, resulting in an overlapping area between the two conveyor belts in the axial direction, which helps to ensure the continuity of the arc-shaped channel 30 in the axial direction. The side of the conveyor belt makes frictional contact with the side wall of the sheet material, applying a dragging force through the side wall surface. The detachable support flanges facilitate the replacement of flanges with different outer diameters to adjust the spacing of the arc-shaped channel 30.

[0108] This application does not limit the specific structure and arrangement of the support rollers and support flanges, for example:

[0109] In one embodiment, the support roller is a cylindrical steel roller with threaded holes at both ends. The support flange is a steel disc with a central positioning hole that matches the end of the support roller, and is fixed to both ends of the support roller by bolts. For example, the outer diameter of the support roller can be 80 mm, and the outer diameter of the support flange can be 130 mm. The first conveyor belt is a rubber annular belt, fitted around one side of the support roller; the second conveyor belt is a rubber annular belt, fitted around the same side of both support flanges, covering the middle section of the support roller in the axial direction.

[0110] In another embodiment, the support roller is an aluminum alloy cylindrical roller with splines at both ends. The support flange is an aluminum alloy disc with a central spline hole that matches the splines. Circumferential positioning is achieved through the spline engagement, and axial fixation is achieved with a lock nut. For example, the outer diameter of the support roller can be 60 mm, and the outer diameter of the support flange can be 100 mm. The spline connection can transmit a large torque and is suitable for high-speed rotation scenarios.

[0111] In another embodiment, the support roller is a cylindrical roller made of carbon fiber composite material, with flange mounting flanges at both ends. The support flanges are carbon fiber composite discs, detachably connected to the flanges at both ends of the support roller via a snap-fit ​​structure. The outer diameter of the support roller can be 50 mm, and the outer diameter of the support flanges can be 90 mm. Carbon fiber composite material is lightweight and has low inertia, which helps to reduce dynamic errors during start-up and shutdown.

[0112] Based on the above-mentioned double-layer sheet conveying assembly provided in this application, such as Figures 1 to 3 As shown, the first transfer speed is less than the second transfer speed, and the difference between the two is V; where V is calculated by the following formula: V=W2*R2-W1*R1; where W1 is the rotational angular velocity of the first transfer component 10 along the first arc segment 100; R1 is the radius of the arc where the first arc segment 100 is located; W2 is the rotational angular velocity of the second transfer component 20 along the second arc segment 200; and R2 is the radius of the arc where the second arc segment 200 is located.

[0113] Specifically, W1 is the angular velocity of the first transfer component 10 (i.e., the first rotating support 120) as it rotates along the first arc segment 100, in radians per second. R1 is the radius of the arc containing the first arc segment 100, i.e., the radius of the first conveyor belt's running path, in millimeters. W2 is the angular velocity of the second transfer component 20 (i.e., the second rotating support 220) as it rotates along the second arc segment 200, in radians per second. R2 is the radius of the arc containing the second arc segment 200, i.e., the radius of the second conveyor belt's running path, in millimeters per second. V is the difference between the first transfer speed and the second transfer speed, i.e., the result of subtracting the first transfer speed from the second transfer speed, in millimeters per second.

[0114] In operation, the first conveying speed is equal to the product of W1 and R1, and the second conveying speed is equal to the product of W2 and R2. When W1 equals W2 (i.e., constant angular velocity rotation) and R1 is less than R2, V = W2*R2 - W1*R1 = W*(R2 - R1), and the speed difference is determined by the radius difference. When W1 and W2 are not equal, the speed difference is determined by both the angular velocity difference and the radius difference. This formula provides a quantitative basis for setting the speed difference, enabling the equipment to accurately calculate the required speed difference based on the specific arc radius and conveying angle, thereby achieving synchronous conveying of the double-layer sheet material.

[0115] This application also provides a reversing device 1 for packaging bags, such as... Figures 6 to 7 As shown, the packaging bag includes at least two layers of sidewalls stacked along its thickness direction; it also includes the aforementioned double-layer sheet conveying assembly; wherein, the packaging bag is conveyed along the first direction A to the inlet of the conveying assembly, the conveying assembly receives the packaging bag, and the first transfer component 10 moves one sidewall of the packaging bag along the extension direction of the first arc segment 100, and the second transfer component 20 moves the other sidewall of the packaging bag along the extension direction of the second arc segment 200, so that the packaging bag is conveyed outward from the outlet of the reversing device along the second direction; wherein, the second direction B and the first direction A are inclined at a preset angle to each other.

[0116] Specifically, the packaging bag is a bag-shaped product comprising at least two layers of sidewalls, which are stacked along their thickness direction. A first direction A is the direction in which the packaging bag enters the conveying assembly, and a second direction B is the direction in which the packaging bag leaves the reversing device; the two are inclined at a preset angle. The inlet of the conveying assembly is the starting end of the arc-shaped channel 30, which receives the packaging bag conveyed along the first direction A; the outlet is the ending end of the arc-shaped channel 30, from which the packaging bag exits along the second direction B.

[0117] In use, after the packaging bag enters the arc-shaped channel 30, one sidewall abuts against the first arc-shaped segment 100, and the other sidewall abuts against the second arc-shaped segment 200. The first transfer component 10 drags the inner sidewall at a slower speed, while the second transfer component 20 drags the outer sidewall at a faster speed, so that the two sidewalls remain synchronized in the arc-shaped path. After passing through the arc-shaped channel 30, the packaging bag changes from the first direction A to the second direction B, and the two sidewalls remain aligned without misalignment or twisting.

[0118] This application is not limited to the specific application scenarios and configuration methods of the commutation device, for example:

[0119] In one embodiment, the reversing device is used in a bag-making machine. The packaging bag is a flat plastic bag, with a first direction A being vertically downward and a second direction B being horizontal, with a preset included angle of 90 degrees. The flat bag enters the arc-shaped channel 30 from the vertical direction, changes to the horizontal direction through a 90-degree arc path, and is output. The two sidewalls remain aligned during the reversing process.

[0120] In another embodiment, the reversing device is used in a packaging production line. The packaging bag is a paper-plastic composite bag. The first direction A is horizontal to the right, and the second direction B is horizontal to the front, with a preset angle of 90 degrees. The bag enters the arc-shaped channel 30 from the horizontal direction and is transformed into a vertical direction through a 90-degree arc path before being output.

[0121] In another embodiment, the reversing device is used in a multi-station packaging equipment. The packaging bag is an aluminum foil bag. The first direction A is vertically downward, and the second direction B is inclined downward at a 60-degree angle to the vertical direction, with the preset angle being 60 degrees. The bag body achieves a direction change by traversing a 60-degree arc path, which is suitable for reversing requirements at smaller angles.

[0122] Based on the aforementioned reversing device 1 for the packaging bag provided in this application, such as Figures 6 to 7 As shown, the preset included angle is set within the range of 60 degrees to 120 degrees, and the central angle of the first arc segment 100, the central angle of the second arc segment 200, and the preset included angle are equal to each other.

[0123] The preset included angle is the angle between the first direction A and the second direction B, and is set within the range of 60 degrees to 120 degrees. The central angles of the first arc segment 100 and the second arc segment 200 are both equal to the preset included angle, so that the bending angle of the arc channel 30 is consistent with the direction change angle.

[0124] When the three angles are equal, the tangent direction at the inlet of the arc-shaped channel 30 is consistent with the first direction A, and the tangent direction at the outlet is consistent with the second direction B. The packaging bag does not require additional deflection when entering and leaving the arc-shaped channel 30, resulting in a smooth transition. The range of 60 to 120 degrees covers the directional change requirements from smaller to larger angles, enabling significant directional changes without increasing the resistance of the sheet material conveying or causing damage to the sheet material due to excessive bending angles.

[0125] This application does not limit the specific values ​​of the preset included angle and the central angle, for example:

[0126] In one embodiment, the preset included angle is set to 90 degrees, and the central angles of the first arc segment 100 and the second arc segment 200 are both 90 degrees. This allows the packaging bag to smoothly guide the bag through the quarter-circle path of the arc channel 30 as it changes direction from vertical to horizontal.

[0127] In another embodiment, the preset included angle is set to 60 degrees, and the central angles of the first arc segment 100 and the second arc segment 200 are both 60 degrees. The smaller reversing angle is suitable for scenarios that require slight adjustments to the conveying direction. The arc path is shorter, and the travel time of the sheet material within the arc channel 30 is shorter, which helps to improve conveying efficiency.

[0128] In another embodiment, the preset included angle is set to 120 degrees, and the central angles of the first arc segment 100 and the second arc segment 200 are both 120 degrees. A larger reversal angle is suitable for scenarios requiring a significant change in conveying direction. The longer arc path allows for a smoother guidance of the bag to complete the direction change, reducing the impact of sudden angle changes on the bag.

[0129] Based on the aforementioned reversing device 1 for the packaging bag provided in this application, such as Figures 6 to 7 As shown, it also includes a bag receiving component 40 disposed at the inlet of the conveying component and a bag output component 50 disposed at the outlet of the conveying component. The bag receiving component 40 receives the packaging bag along the first direction A at a first preset speed and moves it to the inlet of the conveying component; the bag output component 50 moves the packaging bag from the outlet of the conveying component to the next station along the second direction B at a second preset speed.

[0130] Specifically, the bag receiving assembly 40 is a conveying component located in front of the inlet of the conveying assembly, extending along the first direction A, for receiving packaging bags conveyed upstream and transferring them to the inlet of the arc-shaped channel 30. It can employ structures such as conveyor belts, conveyor rollers, and clamping chains. The bag output assembly 50 is a conveying component located behind the outlet of the conveying assembly, extending along the second direction, for receiving packaging bags output from the arc-shaped channel 30 and transferring them to the downstream workstation. It can employ the same or different structures as the bag receiving assembly 40.

[0131] In use, the bag receiving component 40 smoothly feeds the packaging bag into the arc-shaped channel 30 at the inlet, and the bag output component 50 smoothly leads the packaging bag out of the arc-shaped channel 30 at the outlet. The two components are respectively connected to the inlet and outlet tangential directions of the arc-shaped channel 30, so that the transition of the packaging bag when entering and exiting the arc-shaped channel 30 is smooth, reducing positional deviation and stress concentration in the transition area.

[0132] This application does not limit the specific structure and arrangement of the bag receiving component 40 and the bag output component 50, for example:

[0133] In one embodiment, the bag receiving assembly 40 can be a vertically arranged conveyor belt that conveys flat bags downwards in the vertical direction at a first preset speed to the inlet of the arc-shaped channel 30. The bag output assembly 50 is a horizontally arranged conveyor belt that conveys bags horizontally from the outlet of the arc-shaped channel 30 to the downstream sealing station at a second preset speed. The surface of the conveyor belt is provided with anti-slip texture to help stabilize the bag.

[0134] In another embodiment, the bag receiving assembly 40 can be a vertically arranged set of conveying rollers, with multiple rollers spaced apart vertically, moving the bag downwards by rotating the rollers. The bag output assembly 50 is a horizontally arranged set of conveying rollers, moving the bag horizontally to the downstream station. The roller conveying structure facilitates the passage of the bag between the rollers and is suitable for bags of different thicknesses.

[0135] In another embodiment, the bag receiving assembly 40 can be a clamping chain mechanism, with two chains arranged in parallel, clamping both sides of the bag and moving the bag downwards in a vertical direction. The bag output assembly 50 is a horizontal clamping chain mechanism, clamping and moving the bag in the same manner. The clamping chains can clamp the bag more firmly and are suitable for bag materials with smooth surfaces and low coefficients of friction.

[0136] Based on the aforementioned reversing device 1 for the packaging bag provided in this application, such as Figures 6 to 7 As shown, the first preset speed is less than or equal to the first transfer speed, and the second preset speed is greater than or equal to the first transfer speed.

[0137] The first preset speed is the speed at which the bag receiving component 40 conveys the packaging bag. The first transfer speed is the speed at which the sheet material is dragged by the first arc-shaped section 100 (radially inward). The second preset speed is the speed at which the bag output component 50 conveys the packaging bag. The first preset speed is less than or equal to the first transfer speed, that is, the receiving speed at the inlet is lower than the minimum transfer speed within the arc-shaped channel 30; the second preset speed is greater than or equal to the first transfer speed, that is, the output speed at the outlet is higher than the minimum transfer speed within the arc-shaped channel 30.

[0138] In operation, the first preset speed is less than the first conveying speed, allowing the packaging bag to accelerate or be conveyed smoothly as it enters the arc-shaped channel 30 from the bag receiving component 40. The accelerated movement of the bag after entering the arc-shaped channel 30 helps the material adhere tightly to the inner wall of the channel, reducing slack during entry. The second preset speed is greater than or equal to the first conveying speed, allowing the packaging bag to accelerate or be conveyed smoothly as it enters the bag output component 50 from the arc-shaped channel 30. The bag is quickly pulled out, preventing accumulation at the exit. This speed gradient between inlet and outlet acceleration ensures the packaging bag maintains appropriate tension within the arc-shaped channel 30.

[0139] This application does not limit the specific values ​​of the first preset speed and the second preset speed. For example, in one embodiment, the first transfer speed is 500 mm / s, the first preset speed (speed of bag receiving component 40) is set to 400 mm / s, and the second preset speed (speed of bag output component 50) is set to 600 mm / s. The bag accelerates from 400 mm / s to more than 500 mm / s at the inlet and from 500 mm / s to 600 mm / s at the outlet, forming a speed gradient of inlet acceleration and outlet acceleration.

[0140] In another embodiment, the first conveying speed is 300 mm / s, the first preset speed is set to 300 mm / s, and the second preset speed is set to 350 mm / s. This embodiment is suitable for bag-making equipment operating at lower speeds, with a gentler speed gradient, which helps reduce deformation of thin bags during acceleration.

[0141] In another embodiment, the first conveying speed is 800 mm / s, the first preset speed is set to 650 mm / s, and the second preset speed is set to 950 mm / s. This embodiment is suitable for high-speed bag-making equipment, and the larger speed gradient helps to maintain the tension of the bag during high-speed conveying.

[0142] This application also provides a bag-making device, such as... Figure 8 As shown, the packaging includes a bag forming assembly 60, a bag folding assembly 70, and a reversing device 1 arranged vertically from top to bottom. The first direction A is vertical, and the second direction B is horizontal. The bag forming assembly 60 receives sheet material and forms it into a three-dimensional bag. The bag folding assembly 70 is located downstream of the bag forming assembly 60, receives the three-dimensional bag from the bag forming assembly 60, and folds the bag into a flat shape. The reversing device receives the flat bag along the first direction A and conveys it out along the second direction.

[0143] Specifically, the bag forming assembly 60 is a component in the bag-making equipment that processes sheet material into three-dimensional bags. Located at the top of the equipment, it receives sheet material and shapes it into a three-dimensional bag through processes such as bending and sealing. The bag folding assembly 70 is a component in the bag-making equipment that folds the three-dimensional bag into a flat shape. Located below the bag forming assembly 60, it receives the three-dimensional bag and folds its sidewalls to flatten the bag. The reversing device is the reversing device 1 for the aforementioned packaging bag. Located below the bag folding assembly 70, it receives the flattened bag vertically and outputs it horizontally after changing direction through the arc-shaped channel 30.

[0144] In operation, the sheet material enters the bag forming assembly 60 from the top of the equipment. After being formed into a three-dimensional bag, it is conveyed downwards to the bag folding assembly 70, where it is folded into a flat shape and then conveyed downwards to the inlet of the arc-shaped channel 30 of the reversing device. The reversing device changes the flattened bag from a vertical direction to a horizontal direction via an arc-shaped path, facilitating subsequent horizontal processes such as sealing, cutting, and collection. The differential speed conveying of the reversing device ensures that the two sidewalls of the bag remain aligned during the reversal process, which helps improve the quality of subsequent processing. The vertical layout results in a smaller footprint for the equipment.

[0145] This application does not limit the specific structure and configuration of the bag-making equipment, for example:

[0146] In one embodiment, the bag forming assembly 60 can be a tubular film forming device, which inflates and cools a tubular film to form a three-dimensional bag. The bag folding assembly 70 is a bi-folding device, which folds the three-dimensional bag along its center line to form a flat shape. A reversing device is located below the bi-folding device, and the central angle of the arc-shaped channel 30 is 90 degrees, which changes the flat bag from a vertical direction to a horizontal direction. After being output, the bag enters a horizontal sealing and cutting station.

[0147] In another embodiment, the bag forming assembly 60 is a single-piece film bending and forming device that bends and seals a single-piece film to form a three-dimensional bag. The bag folding assembly 70 is a two-sided folding device that folds the two side walls of the three-dimensional bag inward to flatten the bag. The arc-shaped channel 30 of the reversing device has a central angle of 90 degrees, changing the flattened bag from a vertical direction to a horizontal direction. This embodiment is suitable for single-piece film bag making processes.

[0148] In another embodiment, the bag forming assembly 60 can also be a multi-station rotary forming device, which sequentially completes the bending and sealing of sheet material to form a three-dimensional bag through rotating stations. The bag folding assembly 70 is a pressure plate folding device, which flattens the three-dimensional bag into a flat shape through the action of upper and lower pressure plates. The arc-shaped channel 30 of the reversing device has a central angle of 90 degrees, which changes the flattened bag from a vertical direction to a horizontal direction. This embodiment is suitable for multi-station continuous bag making processes.

[0149] Based on the bag making equipment provided in this application, a bag alignment part 80 is further provided between the inlet end of the bag folding assembly 70 and the outlet end of the bag forming assembly 60. The bag alignment part 80 extends vertically, with its inlet end adapted and aligned with the outlet end of the bag forming assembly 60 in the vertical direction, and its outlet end adapted and aligned with the inlet end of the bag folding assembly 70 in the vertical direction, thereby aligning the side wall of the three-dimensional bag with the inlet end of the bag folding assembly 70.

[0150] Specifically, the bag alignment part 80 is a transition guide component disposed between the bag forming assembly 60 and the bag folding assembly 70. Extending vertically, it is used to correct the position of the three-dimensional bag output from the forming assembly, aligning its sidewalls with the inlet end of the folding assembly. The inlet end is adapted and aligned with the outlet end of the bag forming assembly 60, and the outlet end is adapted and aligned with the inlet end of the bag folding assembly 70, ensuring that the bag maintains the correct position and posture during vertical conveying guided by the alignment part.

[0151] During use, the 3D bag may experience slight positional shifts or deformations after exiting the bag forming assembly 60. The bag alignment section 80 corrects the bag's position using a guide structure extending vertically, ensuring that the bag's sidewalls are correctly aligned when entering the folding assembly inlet. The alignment section does not change the bag's conveying direction; it only corrects the bag's horizontal position, reducing folding defects caused by bag misalignment.

[0152] This application does not limit the specific structure and arrangement of the bag alignment part 80. For example, in one embodiment, the bag alignment part 80 consists of two vertically arranged parallel guide plates. The distance between the two guide plates is adapted to the width of the bag. When the bag passes between the two guide plates, it is guided and its position is corrected by the guide plates. The entrance end of the guide plate is provided with a funnel-shaped guide section to facilitate the smooth entry of the bag.

[0153] In another embodiment, the bag alignment section 80 can also be two vertically arranged pairs of guide rollers or conveyor belts, each pair of which is arranged opposite to each other to form an alignment space. When the bag passes through the alignment space, the two pairs of guide rollers or conveyor belts roll and guide the sidewalls of the bag, reducing frictional damage to the bag surface. The spacing between the rollers can be adjusted by an adjustment mechanism to accommodate bags of different widths.

[0154] In another embodiment, the bag alignment portion 80 is a vertically arranged guide groove structure. The cross-sectional shape of the guide groove is adapted to the cross-sectional shape of the bag, and the bag is guided and corrected in position by the groove wall as it passes through the guide groove. The inner wall of the guide groove is provided with a low-friction coating to facilitate the smooth passage of the bag. The inlet and outlet of the guide groove are respectively connected to the outlet end of the forming component and the inlet end of the folding component.

[0155] The double-layer sheet material conveying assembly provided in this application uses a first conveying component 10 and a second conveying component 20 to drag the inner and outer layers of the double-layer sheet material at different conveying speeds. The first arc-shaped segment 100 is located radially inner and has a lower conveying speed, while the second arc-shaped segment 200 is located radially outer and has a higher conveying speed. This allows the faster conveying speed of the outer sheet material layer to compensate for its longer arc-shaped path length, thereby achieving synchronous movement of the double-layer sheet material during arc-shaped conveying. This solves the technical problem of misalignment of the double-layer sheet material due to the different path lengths of the inner and outer layers when conveying at an angle. Furthermore, differential conveying is achieved through a coaxially arranged rotating support and conveyor belt; the drive structure is simplified through the design of equal angular velocity and equal central angle; adaptability is improved through the modular design of the support rollers and support flanges; and a quantitative calculation basis is provided through the speed difference formula. The conveying component is applied to the reversing device 1 of the packaging bag so that the two side walls of the bag remain aligned during the reversing process; it is further applied to the bag making equipment to realize the reversing conveying from the vertical direction to the horizontal direction, and together with the bag alignment part 80, the folding accuracy is improved, forming a complete bag making process.

[0156] The above description illustrates the implementation of this utility model through specific embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model is presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details are included in the above description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0157] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0158] In the description of this embodiment, it should be noted that the terms "upper," "lower," "inner," "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on the utility model.

[0159] The terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0160] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "setup," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

Claims

1. A conveying assembly for double-layer sheet materials, characterized in that, It includes a first transfer component and a second transfer component; wherein The first transfer component has a first arc-shaped segment, and the second transfer component has a second arc-shaped segment. The first arc-shaped segment and the second arc-shaped segment are arranged radially spaced apart from each other, forming an arc-shaped channel between them; and The first arc segment is located radially inside the arc channel, and the first conveying speed of the first arc segment is less than the second conveying speed of the second arc segment. The first conveying component and the second conveying component respectively drive the corresponding side of the double-layer sheet material in the arc channel to move, and the double-layer sheet material in the arc channel moves synchronously.

2. The double-layer sheet conveying assembly as described in claim 1, characterized in that, The rotation center of the first arc segment coincides with the rotation center of the second arc segment, and the arc length of the first arc segment is less than the arc length of the second arc segment.

3. The double-layer sheet conveying assembly as described in claim 2, characterized in that, The first transfer component includes a first dragging part movably disposed along the extending direction of the first arcuate segment, and the second transfer component includes a second dragging part movably disposed along the extending direction of the second arcuate segment; wherein, The first dragging part and the second dragging part respectively drag the double-layer sheet material in the arc-shaped channel to move synchronously.

4. The double-layer sheet conveying assembly as described in claim 3, characterized in that, The first transfer component includes a first rotating support portion, and the second transfer component includes a second rotating support portion coaxially disposed with the first rotating support portion. The outer diameter of the first rotating support portion is smaller than the outer diameter of the second rotating support portion. Specifically, a first arc-shaped segment is formed on one outer periphery of the first rotating support portion, and a second arc-shaped segment is formed on the same inner periphery of the second rotating support portion. The first dragging part is configured as a first conveyor belt surrounding the outer periphery of the portion of the first arc-shaped segment on the first rotating support part, and the second dragging part is configured as a second conveyor belt surrounding the outer periphery of the portion of the second arc-shaped segment on the second rotating support part; wherein... The first conveyor belt and the second conveyor belt form the arc-shaped channel through the radial gap at the arc-shaped part, and the first conveyor belt is in frictional contact with the sheet material on the inner radial side of the arc-shaped channel, while the second conveyor belt is in frictional contact with the sheet material on the outer radial side of the arc-shaped channel.

5. The double-layer sheet conveying assembly as described in claim 4, characterized in that, The first dragging part and the second dragging part have the same rotational angular velocity in the arc-shaped part, and the central angle of the first arc segment is equal to the central angle of the second arc segment.

6. The double-layer sheet conveying assembly as described in claim 4, characterized in that, The first rotating support and the second rotating support are arranged adjacent to each other along the axial direction, and a radial step space is formed between the first rotating support and the second rotating support.

7. The double-layer sheet conveying assembly as described in claim 6, characterized in that, The first rotating support portion is configured as a support roller, and the second rotating support portion is configured as a support flange detachably connected to both ends of the support roller, wherein the outer diameter of the support flange is larger than the outer diameter of the support roller; the first conveyor belt is wound around one side of the outer periphery of the support roller, and the second conveyor belt is wound around the same side of the outer periphery of the two support flanges and covers the support roller axially; wherein... The side wall of the first conveyor belt facing the second conveyor belt is in frictional contact with the radially inner side wall of the sheet material, and the side wall of the second conveyor belt facing the first conveyor belt is in frictional contact with the radially outer side wall of the sheet material.

8. The double-layer sheet conveying assembly as described in any one of claims 1 to 7, characterized in that, The first transfer speed is less than the second transfer speed, and the difference between the two is V; in V is calculated using the following formula: V = W2 * R2 - W1 * R1; where, W1 is the rotational angular velocity of the first transfer component along the first arc segment; R1 is the radius of the arc containing the first arc segment; W2 is the rotational angular velocity of the second transfer component along the second arc segment; R2 is the radius of the arc containing the second arc segment.

9. A reversing device for a packaging bag, the packaging bag comprising at least two layers of sidewalls stacked along its thickness direction; characterized in that, It also includes the double-layer sheet conveying assembly according to any one of claims 1 to 8; wherein, The packaging bag is conveyed along a first direction to the inlet of the conveying assembly, the conveying assembly receives the packaging bag, and the first transfer component moves one sidewall of the packaging bag along the extension direction of the first arc segment, and the second transfer component moves the other sidewall of the packaging bag along the extension direction of the second arc segment, so that the packaging bag is conveyed outward from the outlet of the reversing device along a second direction; wherein, The second direction and the first direction are inclined at a preset angle to each other.

10. The reversing device for packaging bags as described in claim 9, characterized in that, The preset included angle is set within the range of 60° to 120°, and the central angle of the first arc segment, the central angle of the second arc segment, and the preset included angle are equal to each other.

11. The reversing device for packaging bags as described in claim 9, characterized in that, It also includes a bag receiving component disposed at the inlet of the conveying component and a bag output component disposed at the outlet of the conveying component. The bag receiving component receives the packaging bag along the first direction at a first preset speed and moves it to the inlet of the conveying component. The bag output component moves the packaging bag from the outlet of the conveying component to the next station along the second direction at a second preset speed.

12. The reversing device for packaging bags as described in claim 11, characterized in that, The first preset speed is less than or equal to the first transfer speed, and the second preset speed is greater than or equal to the first transfer speed.

13. A bag-making device, characterized in that, The package includes a bag forming assembly, a bag folding assembly, and a reversing device for the packaging bag as described in any one of claims 9 to 12, arranged vertically from top to bottom, wherein the first direction is vertical and the second direction is horizontal; wherein, The bag forming assembly receives sheet material and forms the received sheet material into a three-dimensional bag; The bag folding assembly is located downstream of the bag forming assembly, receives the three-dimensional bag from the bag forming assembly, and folds the bag body of the three-dimensional bag into a flat shape; the reversing device receives the flat bag body along the first direction and conveys it out along the second direction.

14. The bag-making equipment as described in claim 13, characterized in that, A bag alignment portion is also provided between the inlet end of the bag folding assembly and the outlet end of the bag forming assembly. The bag alignment portion extends along the vertical direction, the inlet end is adapted and aligned with the outlet end of the bag forming assembly in the vertical direction, and the outlet end is adapted and aligned with the inlet end of the bag folding assembly in the vertical direction, thereby aligning the side wall of the three-dimensional bag with the inlet end of the bag folding assembly.

Images