Edge folding device for bag making machine

Abstract

The utility model discloses a kind of edge folding devices of bag making machine, including the bearing platform of bearing sheet, and the edge folding component in the edge folding direction of sheet is located in the side of bearing platform. Edge folding component includes the main bending unit of being movably arranged in the side of bearing platform along edge folding direction and the height direction of bearing platform, and the auxiliary bending unit of being arranged above bearing platform, can be moved towards sheet edge. When the size of making packaging bag changes, after causing the change of first alignment position and auxiliary pressing position, the moving stroke of main bending unit in edge folding direction can be changed, and the moving stroke of auxiliary edge folding unit, then make main bending unit move to the first alignment position after change, auxiliary bending unit moves to the auxiliary pressing position after change, then carry out edge folding action again, to reach the purpose of adapting different size packaging bag, so this edge folding device of bag making machine has the advantage of wide application range.

Description

Technical Field

[0001] This utility model belongs to the field of packaging bag manufacturing technology, and in particular relates to a folding device for a bag making machine. Background Technology

[0002] Bag making machines are devices that automatically produce various types of packaging bags from rolls of materials such as plastic, paper, and non-woven fabric through processes such as feeding, correction, heat sealing, and cutting. They are widely used in industries such as food, daily chemicals, and logistics. For example, common bag making machines include non-woven bag making machines and bag making machines.

[0003] Generally, automatic edge folding is an indispensable step in the bag-making process, such as folding the bag opening and bottom. The edge folding device of a bag-making machine is a device used to bend the edges of various materials. It is widely used in the bag-forming process to fold the edges of sheet materials, such as paper, non-woven fabric, and other materials. Its main function is to bend the edges of materials into the required shapes to meet different industrial needs.

[0004] Specifically, taking the paper bag manufacturing process as an example, when processing paper bags using a bag-making machine, the machine's folding device often needs to fold the edges of the paper bag sheet. For instance, during the paper bag manufacturing process, the bag opening is folded up to ensure the connection strength of the bag opening.

[0005] However, in existing bag-making machines, the folding device is typically designed for a specific bag size. After the sheet is fed onto the support platform, the folding plate is positioned below the folding edge of the sheet, and the folding is achieved by rotating the folding plate relative to the edge of the support platform. However, when the sheet size changes, resulting in changes to the folding edge size and crease position, the folding plate cannot be adjusted in the width direction of the support platform. Therefore, it is necessary to replace the folding plate or the entire folding device to accommodate different sheet sizes.

[0006] It is evident that the folding device of the existing bag making machine has low applicability when folding the sheet material for making packaging bags because it cannot adapt to sheets of different sizes. Utility Model Content

[0007] The purpose of this invention is to solve the problem that the folding device of the existing bag making machine has low applicability when folding the sheet material for making packaging bags because it cannot adapt to sheet materials of different sizes.

[0008] To solve the above-mentioned technical problems, this utility model discloses a folding device for a bag making machine, including a support platform for carrying sheet material and a folding assembly located on one side of the support platform in the folding direction of the sheet material.

[0009] The folding assembly includes a main bending unit that can be moved along the folding direction and the height direction of the support platform and is disposed on one side of the support platform, and an auxiliary bending unit disposed above the support platform and can move toward the edge of the sheet.

[0010] In this process, the folded edge of the sheet on the support platform extends out of the support platform along the folding direction. The main bending unit moves from the initial position along the folding direction to the first alignment position below the folded edge, and the auxiliary bending unit moves from the auxiliary initial position to the auxiliary pressing position. The main bending unit moves upward along the height direction to the pushing position, and then moves along the folding direction toward the support platform to the second alignment position. The auxiliary bending unit moves from the auxiliary pressing position to the auxiliary initial position.

[0011] In the initial position, the main bending unit is located below the support platform; in the first alignment position, the edge of the main bending unit near the support platform is aligned with the inner edge of the folded portion in the height direction; in the pushing position, the main bending unit is located above the support platform; and in the second alignment position, the edge of the main bending unit away from the support platform is aligned with the inner edge of the folded portion in the height direction.

[0012] Furthermore, in the initial auxiliary position, the auxiliary bending unit is located above the bearing platform and inside the folded edge of the sheet; and in the auxiliary pressing position, the edge of the auxiliary bending unit near the folded edge is aligned with the inner edge of the pressing folded edge.

[0013] Using the above technical solution, when the folding device of this bag making machine is in use, the folded part of the sheet material conveyed to the carrying platform extends out of the carrying platform along the folding direction. Then, the main bending unit moves along the folding direction to the first alignment position below the folded part, while the auxiliary bending unit moves from the auxiliary initial position to the auxiliary pressing position. At this time, the auxiliary bending unit limits the inner side of the folded part in the height direction. Then, the main bending unit moves upward along the height direction to the pushing position, so that the inner side of the folded part is accurately bent along the edge of the auxiliary bending unit to form a crease line. After the packaging bag is produced, the quality and aesthetics of the produced packaging bag are improved because the crease position of the folded part is accurate.

[0014] Furthermore, after the main bending unit moves upward along the height direction to the pushing position, it moves towards the carrying platform along the folding direction to the second alignment position. At this time, the auxiliary bending unit moves from the auxiliary pressing position to the auxiliary initial position, thereby completing the purpose of folding the packaging bag sheet. In this process, since the main folding unit is located below the carrying platform before folding the folded part, and only moves along the folding direction to the first alignment position below the folded part during folding, when the size of the packaging bag sheet changes in the folding direction, causing changes in the first alignment position and the auxiliary pressing position, the movement stroke of the main bending unit in the folding direction and the movement stroke of the auxiliary folding unit can be changed. Then, the main bending unit moves to the changed first alignment position, and the auxiliary bending unit moves from the auxiliary initial position to the changed auxiliary pressing position before performing the folding action. This achieves the purpose of adapting to packaging bags of different sizes. Therefore, this folding device of the bag making machine also has the advantage of wide applicability.

[0015] Furthermore, the present invention also discloses a folding device for a bag making machine, wherein the main bending unit is a main folding plate extending along the folding portion; and in the initial position, the main folding plate is located outside the bearing platform in the folding direction, and the edge close to the bearing platform and the outer edge of the bearing platform are spaced apart in the folding direction.

[0016] By adopting the above technical solution, since there is a gap between the edge of the main folding plate near the bearing platform and the outer edge of the bearing platform in the folding direction, it can be ensured that when the size of the sheet material for making packaging bags changes in the folding direction, causing the first alignment position to change, the main folding plate can move and adjust its position along the folding direction, thereby adapting to different sizes of sheets used for making packaging bags.

[0017] In addition, the main folded edge plate is located outside the bearing platform in the folding direction, which allows the main folded edge plate and the bearing platform to be misaligned in the height direction, thereby avoiding the problem of interference between the main folded edge plate and the bearing platform when the main folded edge plate moves upward in the height direction.

[0018] Furthermore, an embodiment of this utility model also discloses a folding device for a bag making machine, wherein a guide portion is provided on the edge of the main folding plate near the bearing platform.

[0019] In the initial position, the guide portion is located below the folded edge portion in the height direction; and the main folded edge plate moves from the initial position along the folding direction to the first alignment position, and the guide portion guides the folded edge portion to at least partially cover the main folded edge plate.

[0020] Using the above technical solution, if the sheet material is relatively soft and the folded edge is too large, the side of the folded edge away from the bearing platform will droop downwards a certain distance under its own weight in the folding direction. Therefore, by setting a guide part, the main folding plate can be moved from the initial position to the first alignment position along the folding direction. The guide part guides the folded edge to at least partially cover the main folding plate, reducing the risk that the drooping part of the folded edge will bend downwards along the height direction when the main folding plate moves along the folding direction.

[0021] Furthermore, the present invention also discloses a folding device for a bag making machine, wherein the guide part is a guide slope disposed on the upper edge of the main folding plate near the bearing platform. The guide slope extends upward from the side near the bearing platform with respect to the height direction, and the thickness of the main folding plate at the end near the bearing platform is less than the thickness at the end away from the other end.

[0022] By adopting the above technical solution, since the thickness of the end of the main folded edge plate near the bearing platform is less than the thickness of the end away from the bearing platform, it is ensured that the side of the folded edge away from the bearing platform will hang down under its own weight and be located above the end of the main folded edge plate near the bearing platform. At this time, when the main folded edge plate moves from the initial position to the first alignment position along the folding direction, the guide slope can smoothly guide the folded edge to move upward towards the main folded edge plate. On the one hand, this prevents the sheet from being scratched or stuck, and on the other hand, it avoids the risk of the hanging part of the folded edge bending downward along the height direction.

[0023] Furthermore, the embodiments of this utility model also disclose a folding device for a bag making machine, which further includes a main driving unit for driving the main folding plate. The main driving unit includes a first driving member whose driving end can move along the folding direction and a second driving member whose driving end can move along the height direction.

[0024] The first driving component drives the main folding plate to move along the folding direction, and the second driving component drives the main folding plate to move along the height direction.

[0025] By adopting the above technical solution, a main drive unit is added to drive the main folding plate. The first drive component drives the main folding plate to move along the folding direction, and the second drive component drives the main folding plate to rise and fall along the height direction. The folding position can be flexibly adjusted to meet the folding processing needs of packaging bags of different specifications.

[0026] Furthermore, an embodiment of this utility model also discloses a folding device for a bag making machine, wherein the auxiliary bending unit includes a plurality of auxiliary bending portions spaced apart along the extending direction of the inner edge of the folding portion.

[0027] Multiple auxiliary bending sections can move synchronously between the auxiliary initial position and the auxiliary pressing position.

[0028] Using the above technical solution, multiple auxiliary bending parts are spaced apart along the extension direction of the inner edge of the folded edge. When it is necessary to apply glue to the folded edge of the sheet, the glue can be applied in the area between two adjacent auxiliary bending parts in the extension direction of the folded edge, so as to avoid the auxiliary bending parts from coming into contact with the glue applied to the folded edge.

[0029] Furthermore, since multiple auxiliary bending parts can move synchronously between the auxiliary initial position and the auxiliary pressing position, when the multiple auxiliary bending parts are in the auxiliary pressing position, their edges close to the main folding plate in the folding direction are aligned with each other, thereby enabling the folding parts to bend precisely along the edges of the multiple auxiliary bending parts to form crease lines.

[0030] Furthermore, the present invention also discloses a folding device for a bag making machine. The auxiliary bending unit further includes a size adjustment component, which is connected to multiple auxiliary bending parts in a transmission manner and can adjust the overall size of the multiple auxiliary bending parts and the spacing between adjacent auxiliary bending parts in the extension direction.

[0031] By adopting the above technical solution, when the size of the sheet material used to make the packaging bag changes in the extension direction, the overall size of multiple auxiliary bending parts can be adjusted in the extension direction by the size adjustment component. This allows the auxiliary folding unit to adapt to folding parts of different sizes in the extension direction, further improving the applicability of this folding device.

[0032] Furthermore, when the sheet size changes, and the adhesive area between two adjacent auxiliary bending sections on the folded edge changes, the spacing between adjacent auxiliary bending sections is adjusted by the size adjustment component, so that each auxiliary bending section does not come into contact with the adhesive area, ensuring that the packaging bag can be reliably folded.

[0033] Furthermore, the embodiments of this utility model also disclose a folding device for a bag making machine, wherein the auxiliary bending unit further includes multiple auxiliary driving units corresponding to multiple auxiliary bending parts respectively.

[0034] Each auxiliary drive unit includes a first drive unit, a transmission connector that is transmissionally connected to the drive end of the first drive unit, and a second drive unit mounted on the transmission connector, and each auxiliary bending unit is transmissionally connected to the drive end of the corresponding second drive unit.

[0035] Furthermore, the first driving unit drives the transmission connector to move along the height direction and moves the corresponding auxiliary bending part along the height direction in conjunction with it, while the second driving unit drives the corresponding auxiliary bending part to move along the folding edge direction.

[0036] Using the above technical solution, when the auxiliary bending part moves away from the folded edge part, the first driving part drives the transmission connector to move along the height direction, and the corresponding auxiliary bending part moves away from the inner side of the folded edge part along the height direction. At the same time, the second driving part drives the corresponding auxiliary bending part to move along the folding direction, so that when the folded edge part moves away from the inner side of the folded edge part, it moves at an angle relative to the height direction. This not only avoids the risk of sheet displacement caused by friction between the auxiliary bending part and the sheet, but also reduces the risk of interference between the auxiliary bending part and the main folded edge plate.

[0037] Furthermore, the present invention also discloses a folding device for a bag making machine, wherein each auxiliary bending part is an auxiliary bending plate; wherein the auxiliary bending plate includes a first part extending along the height direction and a second part disposed at the lower end of the first part and extending along the folding direction.

[0038] Furthermore, at the auxiliary pressing position, the edge of the auxiliary bending unit near the folded edge is aligned with the inner edge of the pressing folded edge, and the adhesive area on the folded edge is misaligned with the position of the second part.

[0039] By adopting the above technical solution, since the glued area on the folded edge is misaligned with the second part, each auxiliary bending part does not come into contact with the glued area, thus ensuring that the packaging bag can be reliably folded.

[0040] Furthermore, the embodiments of this utility model also disclose a folding device for a bag making machine, wherein each transmission connecting member is also provided with a pressing part whose pressing end can move in the height direction.

[0041] In this process, the sheet coated with adhesive is conveyed to the support platform, and the pressing end of the pressing part moves along the height direction toward the main body of the sheet, pressing the main body of the sheet tightly against the support platform.

[0042] By adopting the above technical solution, since the position of the sheet may shift when the folded edge is folded, the pressing part can press the main body of the sheet tightly against the bearing platform, thus avoiding the risk of misalignment caused by the shift of the sheet position when the folded edge is folded. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of the folding device of the bag making machine when the sheet material is placed on the support platform, as provided in the embodiment of this utility model.

[0044] Figure 2 A perspective view of the folding device of the bag making machine provided in an embodiment of this utility model;

[0045] Figure 3 A perspective view of the main folded edge plate provided in an embodiment of this utility model;

[0046] Figure 4 A perspective view showing the structural connection between the main bending unit and the main driving unit provided in an embodiment of this utility model;

[0047] Figure 5 A perspective view of the auxiliary bending unit provided in an embodiment of this utility model;

[0048] Figure 6 This is a perspective view of the auxiliary bending plate provided in an embodiment of the present utility model.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1. Supporting platform;

[0051] 2. Folded edge assembly;

[0052] 20. Main bending unit;

[0053] 200. Main folded edge plate; 201. Guide section;

[0054] 21. Auxiliary bending unit;

[0055] 210. Auxiliary bending section; 211. Size adjustment component; 212. Auxiliary drive unit; 213. First drive section; 214. Transmission connector; 215. Second drive section; 216. Auxiliary bending plate; 217. First part; 218. Second part; 219. Pressing section;

[0056] 2110. Drive motor; 2111. Screw; 2112. Moving frame;

[0057] 22. Main drive unit;

[0058] 220. First driving component; 221. Second driving component; 222. Swing arm; 223. Transmission wheel; 224. Intermediate connecting plate;

[0059] 3. Sheets;

[0060] 4. Rack;

[0061] L, folding direction; W, extension direction; H, height direction. Detailed Implementation

[0062] As described in the background section, in the prior art, the position of the folding plate of the bag making machine cannot be adjusted relative to the support platform in the width direction of the support platform. Therefore, when the size of the sheet changes, resulting in changes in the size of the folded part and the position of the crease, since the position of the folding plate cannot be adjusted in the width direction of the support platform, it is necessary to replace the folding plate or the folding device to adapt to the sheet of different sizes.

[0063] To address the aforementioned problems, this utility model provides a folding device for a bag-making machine, comprising a support platform for supporting sheet material and a folding assembly located on one side of the support platform in the folding direction of the sheet material. The folding assembly includes a main bending unit movable along the folding direction and the height direction of the support platform, positioned on one side of the support platform, and an auxiliary bending unit positioned above the support platform and movable toward the edge of the sheet material. When the dimensions of the sheet material used to make the packaging bag change in the folding direction, resulting in changes to the first alignment position and the auxiliary pressing position, the travel distance of the main bending unit and the auxiliary folding unit in the folding direction can be altered. This allows the main bending unit to move to the changed first alignment position, and the auxiliary bending unit to move from its initial auxiliary pressing position to the changed auxiliary pressing position before the folding action is performed. This achieves the purpose of adapting to packaging bags of different sizes, thus giving this folding device for a bag-making machine the advantage of wide applicability.

[0064] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0065] First, the overall structure of the folding device of the bag making machine provided in this embodiment will be introduced.

[0066] like Figure 1 and Figure 2 As shown, this embodiment discloses a folding device for a bag making machine, including a support platform 1 for carrying sheet 3 and a folding assembly 2 located on one side of the support platform 1 in the folding direction L of sheet 3.

[0067] Specifically, the folding assembly 2 includes a main bending unit 20 that is movable along the folding direction L and the height direction H of the support platform 1 and is disposed on one side of the support platform 1, and an auxiliary bending unit 21 disposed above the support platform 1 and movable toward the edge of the sheet 3.

[0068] More specifically, in use, the folding device of this bag-making machine has the folded portion of the sheet 3 conveyed to the carrying platform 1 extending out of the carrying platform 1 along the folding direction L. Then, the main bending unit 20 moves along the folding direction L to the first alignment position below the folded portion, while the auxiliary bending unit 21 moves from the auxiliary initial position to the auxiliary pressing position. At this time, the auxiliary bending unit 21 is in the height direction H (see...). Figure 4 The inner side of the folded edge is limited; then the main bending unit 20 moves upward along the height direction H to the pushing position, so that the inner side of the folded edge is accurately bent along the edge of the auxiliary bending unit 21 to form a crease line. After the packaging bag is produced, the quality and aesthetics of the produced packaging bag are improved because the crease position of the folded edge is accurate.

[0069] Furthermore, after the main bending unit 20 moves upward along the height direction H to the pushing position, it moves towards the carrying platform 1 along the folding direction L to the second alignment position. At this time, the auxiliary bending unit 21 moves from the auxiliary pressing position to the auxiliary initial position, thereby completing the purpose of folding the sheet 3 of the packaging bag. In this process, since the main folding unit is located below the carrying platform 1 before folding the folded part, and only moves along the folding direction L to the first alignment position below the folded part during folding, when the size of the sheet 3 of the packaging bag changes in the folding direction L, causing the first alignment position and the auxiliary pressing position to change, the movement stroke of the main bending unit 20 in the folding direction L and the movement stroke of the auxiliary folding unit can be changed. Then, the main bending unit 20 moves to the changed first alignment position, and the auxiliary bending unit 21 moves from the auxiliary initial position to the changed auxiliary pressing position, and then the folding action is performed, thereby achieving the purpose of adapting to packaging bags of different sizes. Therefore, the folding device of this bag making machine has the advantage of wide applicability.

[0070] It should be noted that, in the initial position, the main bending unit 20 is located below the support platform 1; in the first alignment position, the edge of the main bending unit 20 near the support platform 1 is aligned with the inner edge of the folded portion in the height direction H; in the pushing position, the main bending unit 20 is located above the support platform 1; and in the second alignment position, the edge of the main bending unit 20 away from the support platform 1 is aligned with the inner edge of the folded portion in the height direction H; in the auxiliary initial position, the auxiliary bending unit 21 is located above the support platform 1 and inside the folded portion of the sheet 3; in the auxiliary pressing position, the auxiliary bending unit 21 is aligned with the inner edge of the folded portion near the edge of the sheet 3 and presses the inner edge of the folded portion.

[0071] It should be understood that the inner side of the folded edge is the side of the folded edge closer to the bearing platform 1 in the folding direction L.

[0072] The structure and arrangement of the main bending unit 20 will be further explained below.

[0073] Specifically, such as Figure 2 As shown, the main bending unit 20 is a main folded plate 200 extending along the folded edge; and, in the initial position, the main folded plate 200 is located outside the bearing platform 1 in the folding direction L, so that the main folded plate 200 and the bearing platform 1 are misaligned in the height direction H, thereby avoiding the problem of interference between the main folded plate 200 and the bearing platform 1 when the main folded plate 200 moves upward in the height direction H.

[0074] Specifically, the main folding plate 200 has a gap between its edge near the supporting platform 1 and the outer edge of the supporting platform 1 in the folding direction L. This ensures that when the size of the sheet 3 used to make the packaging bag changes in the folding direction L, causing a change in the first alignment position, the main folding plate 200 can move and adjust its position along the folding direction L to accommodate different sizes of sheet 3 used to make packaging bags. It should be understood that the outer edge of the supporting platform 1 is the side of the supporting platform 1 near the main folding plate 200 in the folding direction L.

[0075] Furthermore, if the sheet 3 is soft (e.g., paper sheet) and the folded edge is too large, the side of the folded edge furthest from the bearing platform 1 will droop downwards a certain distance under its own weight in the folding direction L; therefore, in one embodiment, such as Figure 2 and Figure 3 As shown, a guide portion 201 is provided on the edge of the main folding plate 200 near the bearing platform 1. In the initial position, the guide portion 201 is located below the folded portion in the height direction H. Furthermore, when the main folding plate 200 moves from the initial position to the first alignment position along the folding direction L, the guide portion 201 guides the folded portion to at least partially cover the main folding plate 200, thereby reducing the risk that the drooping part of the folded portion will bend downward in the height direction H when the main folding plate 200 moves along the folding direction L.

[0076] It should be understood that the guide portion 201 guides the folded edge portion to at least partially cover the main folded edge plate 200, and may be 3 / 4, 2 / 3, 1 / 2, etc. of the size of the main folded edge plate 200. This embodiment does not limit it to a single size.

[0077] Specifically, the structure and configuration of the guide unit 201 are not limited; the following is an example.

[0078] In one embodiment, the guide portion 201 is a guide slope provided on the upper edge of the main folded plate 200 near the support platform 1, and the guide slope extends upward at an angle relative to the height direction H from the side near the support platform 1, and the thickness of the main folded plate 200 at the end near the support platform 1 is less than the thickness away from the other end.

[0079] Specifically, since the thickness of the end of the main folding plate 200 near the bearing platform 1 is less than the thickness of the end away from the bearing platform 1, it ensures that the side of the folded part away from the bearing platform 1 will hang down under its own weight and be located above the end of the main folding plate 200 near the bearing platform 1. At this time, when the main folding plate 200 moves from the initial position along the folding direction L to the first alignment position, the guide slope can smoothly guide the folded part to move upward toward the main folding plate 200, which on the one hand prevents the sheet 3 from being scratched and stuck, and on the other hand avoids the risk of the hanging part of the folded part bending downward along the height direction H.

[0080] Of course, the guide part 201 can also be configured as a guide arc surface or a guide step, etc., and this embodiment does not limit it to a single one.

[0081] The following explains how the main folding plate 200 is driven.

[0082] Specifically, such as Figure 4 As shown, this folding device also includes a main drive unit 22 for driving the main folding plate 200. The main drive unit 22 includes a first drive member 220 whose drive end can move along the folding direction L, and a second drive member 221 whose drive end can move along the height direction H.

[0083] Specifically, the first driving component 220 drives the main folding plate 200 to move along the folding direction L, and the second driving component 221 drives the main folding plate 200 to move along the height direction H.

[0084] More specifically, a main drive unit 22 is added to drive the main folding plate 200. With the help of the first drive component 220, the main folding plate 200 is moved along the folding direction L, and the second drive component 221 drives the main folding plate 200 to rise and fall along the height direction H. The folding position can be flexibly adjusted to adapt to the folding processing requirements of packaging bags of different specifications.

[0085] More specifically, the structure and arrangement of the first driving component 220 and the second driving component 221 are not limited. For example, they can be a drive motor, a drive cylinder, etc. This embodiment does not limit them to a single type.

[0086] The following explains the installation methods of the first driving component 220, the second driving component 221, and the main folding plate 200.

[0087] Please see Figure 1 , Figure 2 and Figure 4This folding device also includes a frame 4, on which a first driving member 220 and a second driving member 221 are mounted. The frame 4 is provided with an intermediate connecting plate 224 that can move along the folding direction L. The driving end of the first driving member 220 is provided with a transmission wheel 223. The first driving member 220 is connected to the intermediate connecting plate 224 via a swing arm 222. The main folding plate 200 is slidably connected to the intermediate connecting plate 224 along the height direction H. The driving end of the second driving member 221 is slidably connected to the intermediate connecting plate 224 along the height direction H. The second driving member 221 passes through the intermediate connecting plate 224 and is fixedly connected to the corresponding side wall of the main folding plate 200.

[0088] Specifically, one end of the swing arm 222 is rotatably connected to the circumferential edge of the transmission wheel 223, and the other end is rotatably connected to the intermediate connecting plate 224. When the position of the main folding plate 200 is changed in the folding direction L, the transmission wheel 223 is driven to rotate by the first driving member 220, and the swing arm 222 drives the intermediate connecting plate 224 to move the main folding plate 200 along the folding direction L. When the position of the main folding plate 200 is changed in the height direction H, the main folding plate 200 is directly driven to move relative to the intermediate connecting plate 224 along the height direction H by the second driving member 221. It should be understood that when the first driving member 220 drives the intermediate connecting plate 224 to move along the folding direction L, it also drives the second driving member 221 to move along the folding direction L.

[0089] Alternatively, the first driving component 220 can be slidably connected to the frame 4 along the height direction H, and the second driving component 221 can be installed on the frame 4. The driving end of the first driving component 220 is fixedly connected to the main folding plate 200, and the driving end of the second driving component 221 is slidably connected to one side of the main folding plate 200 in the folding direction L, thereby realizing the adjustment of the position of the main folding plate 200.

[0090] Therefore, this embodiment does not limit the specific structure for driving the main folding plate 200 to move.

[0091] The structure and arrangement of the auxiliary bending unit 21 will be explained below.

[0092] Specifically, such as Figure 2 and Figure 5As shown, the auxiliary bending unit 21 includes a plurality of auxiliary bending portions 210 spaced apart along the extending direction W of the inner edge of the folded portion. When adhesive needs to be applied to the folded portion of the sheet 3, the adhesive can be applied in the area between each two adjacent auxiliary bending portions 210 along the extending direction W of the folded portion, thereby avoiding the risk of mutual contact between the auxiliary bending portions 210 and the adhesive application area on the folded portion. It should be understood that the number of auxiliary bending portions 210 is not limited, for example, it can be 2, 3, 5, etc., and this embodiment does not impose a unique limitation.

[0093] Specifically, multiple auxiliary bending portions 210 can move synchronously between the auxiliary initial position and the auxiliary pressing position; thereby, when the multiple auxiliary bending portions 210 are in the auxiliary pressing position, their edges close to the main folding plate 200 in the folding direction L are aligned with each other, so that the folding portions are precisely bent along the edges of the multiple auxiliary bending portions 210 to form crease lines.

[0094] Furthermore, to enable the auxiliary bending unit 21 to adapt to sheets 3 of different sizes in the extension direction W, in one embodiment, such as... Figure 5 As shown, the auxiliary bending unit 21 also includes a size adjustment component 211, which is connected to multiple auxiliary bending parts 210 in a transmission manner.

[0095] Specifically, when the size of the sheet 3 used to make the packaging bag changes in the extension direction W, the size adjustment component 211 can adjust the overall size of multiple auxiliary bending parts 210 in the extension direction W, so that the auxiliary folding unit can adapt to folding parts of different sizes in the extension direction W, further improving the applicability of this folding device.

[0096] More specifically, when the size of the sheet 3 changes, and the glue application area between two adjacent auxiliary bending portions 210 on the folded edge changes, the size adjustment component 211 can also adjust the spacing between adjacent auxiliary bending portions 210, so that each auxiliary bending portion 210 does not come into contact with the glue application area, ensuring that the packaging bag can be reliably folded.

[0097] More specifically, the structure and arrangement of the size adjustment component 211 are not limited, and examples are given below.

[0098] In one embodiment, the size adjustment component 211 includes a drive motor 2110 mounted on the frame 4, a screw 2111 extending along the extension direction W and rotatably connected to the frame 4 at both ends, and a movable frame 2112 threadedly connected to the screw 2111 and corresponding to a plurality of auxiliary bending portions 210. Each auxiliary bending portion 210 is correspondingly mounted on its respective movable frame 2112. Each movable frame 2112 is slidably connected to the frame 4 along the extension direction W, and the helical directions of the threaded sections on the screw 2111 that are threadedly connected to two adjacent movable frames 2112 are opposite. The drive end of the drive motor 2110 is drivenly connected to one end of the screw 2111.

[0099] Specifically, the drive motor 2110 drives the screw 2111 to rotate, thereby linking each moving frame 2112 to move the corresponding auxiliary bending part 210 along the extension direction W. Since the helical directions of the threaded sections of the threaded connection between two adjacent moving frames 2112 are opposite, the distance between two adjacent auxiliary bending parts 210 can be adjusted. This allows the size adjustment component 211 to adjust the overall size of multiple auxiliary bending parts 210 in the extension direction W, as well as to adjust the distance between adjacent auxiliary bending parts 210.

[0100] Of course, the size adjustment component 211 may also include multiple linear motors mounted on the frame 4 and corresponding one-to-one with the auxiliary bending part 210, and drive the corresponding auxiliary bending part 210 to move along the extension direction W through each linear motor.

[0101] Furthermore, after adhesive has been applied to the folded edge, in order to reliably bond the folded edge to the body of the sheet 3, when the main folding plate 200 moves towards the support platform 1 along the folding direction L to the second alignment position, and the auxiliary bending unit 21 moves from the auxiliary pressing position to the auxiliary initial position, the main folding plate 200 moves again towards the support platform 1 along the height direction H to the third alignment position. When the main folding plate 200 is in the third alignment position, the main folding plate 200 presses the folded edge in the height direction H, so that the folded edge can be reliably bonded to the body of the sheet 3. It should be understood that when the main folding plate 200 is in the third alignment position: the edge of the main bending unit 20 near the support platform 1 is aligned with the inner edge of the folded edge in the height direction H.

[0102] The following explains how the auxiliary bending section 210 is driven.

[0103] In this embodiment, as Figure 5As shown, the auxiliary bending unit 21 also includes a plurality of auxiliary driving units 212 corresponding to the plurality of auxiliary bending portions 210 respectively; wherein, each auxiliary driving unit 212 includes a first driving portion 213, a transmission connector 214 transmissionly connected to the driving end of the first driving portion 213, and a second driving portion 215 mounted on the transmission connector 214, and each auxiliary bending portion 210 is transmissionly connected to the driving end of the corresponding second driving portion 215. It should be understood that the number of auxiliary driving units 212 is not limited, for example, it can be 2, 3, 5, etc., and this embodiment does not make a unique limitation.

[0104] Specifically, the first driving unit 213 drives the transmission connector 214 to move along the height direction H and links the corresponding auxiliary bending part 210 to move along the height direction H, while the second driving unit 215 drives the corresponding auxiliary bending part 210 to move along the folding direction L.

[0105] More specifically, when the auxiliary bending part 210 moves away from the folded edge part, the first driving part 213 drives the transmission connector 214 to move along the height direction H, and the corresponding auxiliary bending part 210 moves away from the inner side of the folded edge part along the height direction H. At the same time, the second driving part 215 drives the corresponding auxiliary bending part 210 to move along the folding direction L. This causes the folded edge part to move at an angle relative to the height direction H when it moves away from the inner side of the folded edge part. On the one hand, this avoids the risk of the auxiliary bending part 210 rubbing against the sheet 3 and causing the sheet 3 to shift. On the other hand, it avoids the risk of the auxiliary bending part 210 interfering with the main folded edge plate 200.

[0106] More specifically, the structure and arrangement of the transmission connector 214, the first drive unit 213, and the second drive unit 215 are not limited; for example, the first drive unit 213 and the second drive unit 215 can be configured as a drive motor, a drive cylinder, etc., while the transmission connector 214 can be configured as a connecting seat, a base plate, etc. This embodiment does not impose a unique limitation.

[0107] Furthermore, the structure and arrangement of the auxiliary bending part 210 are not limited, and examples are provided below.

[0108] In one implementation, such as Figure 5 and Figure 6 As shown, each auxiliary bending portion 210 is an auxiliary bending plate 216; wherein, the auxiliary bending plate 216 includes a first portion 217 extending along the height direction H, and a second portion 218 disposed at the lower end of the first portion 217 and extending along the folding direction L.

[0109] Specifically, at the auxiliary pressing position, the edge of the auxiliary bending unit 21 near the folded edge is aligned with the inner edge of the pressing folded edge, and the glued area on the folded edge is misaligned with the second part 218, so that each auxiliary bending part 210 does not come into contact with the glued area, ensuring that the packaging bag can be reliably folded.

[0110] More specifically, the second part 218 has a wedge-shaped surface at one end near the main bending unit 20, and one side of the wedge-shaped surface is connected to the side of the second part 218 away from the bearing platform 1 in the height direction H, and the other end is connected to the end wall of the second part 218 near the main folding plate 200, which makes it easier to form crease lines.

[0111] Furthermore, in order to prevent the sheet 3 from shifting position when folding, in one embodiment, each transmission connector 214 is also provided with a pressing part 219 whose pressing end can move toward the height direction H.

[0112] Specifically, the sheet 3 coated with adhesive is conveyed to the bearing platform 1. The pressing end of the pressing part 219 moves along the height direction H toward the main body of the sheet 3, pressing the main body of the sheet 3 tightly against the bearing platform 1. This ensures that the position of the sheet 3 will not shift when the folded edge of the sheet 3 is folded, thereby avoiding the risk of misalignment caused by the shift of the position of the sheet 3 when the folded edge of the sheet 3 is folded.

[0113] More specifically, the structure and arrangement of the clamping part 219 are not limited, for example, it can be a clamping cylinder, a pressure plate, etc., and this embodiment does not limit it to a single one.

[0114] 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 will be included in the following 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, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0115] 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.

[0116] 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.

[0117] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0118] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" 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 folding device for a bag-making machine, characterized in that, It includes a support platform for supporting the sheet material, and a folding assembly located on one side of the support platform in the folding direction of the sheet material; wherein, The folding assembly includes a main bending unit movably disposed on one side of the support platform along the folding direction and the height direction of the support platform, and an auxiliary bending unit disposed above the support platform and movable toward the edge of the sheet; wherein The folded edge of the sheet on the support platform extends out of the support platform along the folding direction. The main bending unit moves from its initial position along the folding direction to a first alignment position below the folded edge, and the auxiliary bending unit moves from its auxiliary initial position to its auxiliary pressing position. The main bending unit moves upward along the height direction to a pushing position, then moves along the folding direction toward the support platform to a second alignment position, and the auxiliary bending unit moves from its auxiliary pressing position to its auxiliary initial position. In the initial position, the main bending unit is located below the support platform; in the first alignment position, the edge of the main bending unit near the support platform is aligned with the inner edge of the folded portion in the height direction; in the pushing position, the main bending unit is located above the support platform; and in the second alignment position, the edge of the main bending unit away from the support platform is aligned with the inner edge of the folded portion in the height direction; and In the initial auxiliary position, the auxiliary bending unit is located above the support platform and inside the folded edge of the sheet; and in the auxiliary pressing position, the auxiliary bending unit presses the inner edge of the folded edge close to its edge.

2. The folding device of the bag making machine as described in claim 1, characterized in that, The main bending unit is a main folded edge plate extending along the folded edge portion; and In the initial position, the main folded edge plate is located outside the bearing platform in the folding direction, and the edge near the bearing platform is spaced apart from the outer edge of the bearing platform in the folding direction.

3. The folding device of the bag making machine as described in claim 2, characterized in that, The main folded edge plate has a guide portion near the edge of the supporting platform; wherein... In the initial position, the guide portion is located below the folded edge portion in the height direction; and the main folded edge plate moves from the initial position along the folding direction to the first alignment position, the guide portion guiding the folded edge portion to at least partially cover the main folded edge plate.

4. The folding device of the bag making machine as described in claim 3, characterized in that, The guide portion is a guide slope provided on the upper edge of the main folded plate near the bearing platform. The guide slope extends upward at an angle relative to the height direction from the side near the bearing platform. The thickness of the main folded plate at the end near the bearing platform is less than the thickness at the end away from the other end.

5. The folding device of the bag making machine as described in claim 2, characterized in that, It also includes a main drive unit for driving the main folding plate, the main drive unit comprising a first drive member whose drive end is movable along the folding direction, and a second drive member whose drive end is movable along the height direction; wherein... The first driving member drives the main folding plate to move along the folding direction, and the second driving member drives the main folding plate to move along the height direction.

6. The folding device of the bag making machine as described in any one of claims 1-5, characterized in that, The auxiliary bending unit includes a plurality of auxiliary bending portions spaced apart along the extending direction of the inner edge of the folded portion; wherein The plurality of auxiliary bending portions can move synchronously between the auxiliary initial position and the auxiliary pressing position.

7. The folding device of the bag making machine as described in claim 6, characterized in that, The auxiliary bending unit further includes a size adjustment component, which is tractively connected to the plurality of auxiliary bending portions and can adjust the overall size of the plurality of auxiliary bending portions and the spacing between adjacent auxiliary bending portions in the extension direction.

8. The folding device of the bag making machine as described in claim 7, characterized in that, The auxiliary bending unit further includes multiple auxiliary drive units corresponding to the multiple auxiliary bending portions; wherein... Each of the auxiliary drive units includes a first drive unit, a transmission connector driven to the drive end of the first drive unit, and a second drive unit mounted on the transmission connector, wherein each of the auxiliary bending parts is driven to the drive end of the corresponding second drive unit; and... The first driving unit drives the transmission connector to move along the height direction and moves the corresponding auxiliary bending part along the height direction in conjunction with it. The second driving unit drives the corresponding auxiliary bending part to move along the folding edge direction.

9. The folding device of the bag making machine as described in claim 8, characterized in that, Each of the auxiliary bending portions is an auxiliary bending plate; wherein, the auxiliary bending plate includes a first portion extending along the height direction, and a second portion disposed at the lower end of the first portion and extending along the folding edge direction; and At the auxiliary pressing position, the auxiliary bending unit presses the inner edge of the folded edge close to the edge of the folded edge, and the glued area on the folded edge is misaligned with the second part.

10. The folding device of the bag making machine as described in claim 9, characterized in that, Each of the aforementioned transmission connectors is further provided with a pressing end that can move toward the height direction; in; A sheet coated with adhesive is conveyed to the support platform, and the pressing end of the pressing part moves along the height direction toward the body of the sheet, pressing the body of the sheet tightly against the support platform.

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