Folding Bag Device and Method

Abstract

This invention belongs to the field of product packaging technology and discloses a bag folding device and method. The bag folding device includes a handling mechanism, a bending mechanism, an abutting mechanism, and a conveying mechanism. After the bending mechanism performs a folding action, the end of the bag opening is positioned below the main body. The abutting mechanism keeps the bag opening in a folded state. Then, the bending mechanism is withdrawn, completing the pre-folding of the bag opening. When the conveying mechanism receives the packaging bag, the bag opening abuts against the conveying part before the main body, allowing the bag opening to be flattened and firmly pressed under the main body, completing the final folding of the bag opening. With the cooperation of the abutting mechanism and the conveying part, the time window between the withdrawal of the folding mechanism and the heat sealing device can be filled. Without complex modifications to the bending mechanism, the deformation recovery problem caused by the elasticity of the packaging bag can be overcome, avoiding misalignment, wrinkling, or poor sealing during subsequent sealing, significantly improving the sealing quality.

Description

Technical Field

[0001] This invention relates to the field of product packaging technology, and in particular to a bag folding device and method. Background Technology

[0002] Silicon wafers are fundamental components in industries such as semiconductors and photovoltaics. After production, silicon wafers need to be stacked neatly in specific quantities and sealed in packaging bags to prevent contamination or damage during transportation.

[0003] After the silicon wafers are bagged, the loose bag opening needs to be neatly folded to make it flat and fit snugly, so that it can be heat-sealed. At present, the folding action is mostly completed by automated mechanical structures such as flipping mechanisms. Specifically, the folding mechanism is used to fold the bag opening to form a specific bend. After the folding mechanism is removed, a heat-sealing device is used to heat-seal it.

[0004] However, there is a brief time window between the removal of the folding mechanism and the heat sealing device. Due to the resilience of the packaging bag, the bag opening is prone to deformation during this period, which can lead to misalignment, wrinkling, or even poor sealing during the subsequent sealing process.

[0005] Therefore, the above problems urgently need to be solved. Summary of the Invention

[0006] The purpose of this invention is to provide a bag folding device and method to avoid the bag opening resetting after the folding mechanism is pulled out, thereby ensuring the subsequent sealing quality and the overall production cycle.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] Folding bag device, comprising:

[0009] The handling mechanism is configured to move product-containing bags to the bag-folding station;

[0010] A bending mechanism, located at the bag folding station, is configured to fold the opening of the packaging bag in a first direction so that the end of the opening is below the body of the packaging bag.

[0011] The abutting mechanism, connected to the conveying mechanism, is configured to prevent the bag opening from reversing after the folding is completed, so that it remains in the folded state.

[0012] The conveying mechanism includes a conveying section that moves along the first direction. The conveying section is used to receive the packaging bag carried by the handling mechanism, such that when the packaging bag is received, the bag opening contacts the conveying section in motion before the main body, and can be pulled and flattened by the conveying section.

[0013] Preferably, the conveying unit includes two synchronous belts, which are spaced apart along a second direction perpendicular to the first direction;

[0014] The conveying mechanism includes a lifting unit and a platform connected to the lifting unit. The platform is located between the two synchronous belts. The lifting unit is configured to drive the platform to lift so that the packaging bag on the platform overlaps the two synchronous belts.

[0015] Preferably, the abutting mechanism includes an abutting cylinder and an abutting block connected to the abutting cylinder. The abutting cylinder is connected to the lifting part and is configured to drive the abutting block to rise and fall, so that the abutting block has a limiting position and an avoidance position that avoid the folding path of the bag opening.

[0016] Preferably, the platform is provided with a notch for inserting the bending mechanism, and the body on the platform can extend above the notch.

[0017] Preferably, the conveying mechanism further includes:

[0018] The conveying unit, connected to the lifting unit, is configured to control the platform to move into or away from the folding station;

[0019] The bag-pressing part, connected to the conveying part and mounted above the platform, is configured to abut against the top of the main body when the packaging bag is transferred.

[0020] Preferably, the lifting unit includes a lifting cylinder and a regulating valve connected to the air passage of the lifting cylinder, the regulating valve being configured to adjust the lifting speed of the lifting cylinder.

[0021] Preferably, the bending mechanism includes:

[0022] The frame is arranged adjacent to the conveying mechanism;

[0023] A drive unit, connected to the frame, is configured to drive the frame closer to or away from the packaging bag;

[0024] A clamping part is provided on the frame and configured to clamp the upper and lower sides of the bag opening, causing it to bend downwards;

[0025] A toggle part, provided on the frame, is configured to toggle the downwardly curved bag opening, causing it to extend downward toward the body.

[0026] Preferably, the clamping part includes:

[0027] The first clamping arm is fixed to the frame and extends along the second direction;

[0028] The second clamping arm extends along the second direction and is staggered with the first clamping arm in the horizontal direction;

[0029] A first driving member, fixed to the frame and connected to the second clamping arm, is configured to drive the second clamping arm to move vertically so that the first clamping arm and the second clamping arm can clamp the upper and lower sides of the bag opening and bend it downward.

[0030] Preferably, the actuating part includes:

[0031] The second driving component is fixed to the frame.

[0032] A lever is connected to a second drive member, which is configured to drive the lever to move horizontally.

[0033] The bag folding method, applicable to the bag folding device described above, includes the following steps:

[0034] Move the packaging bags containing the products to the bag folding station;

[0035] The bending mechanism folds the opening of the packaging bag in a first direction so that the end of the opening is below the body of the packaging bag.

[0036] An abutment mechanism is used to prevent the bag opening from reversing and to keep the bag opening in a folded state.

[0037] After the bag opening is folded over, the handling mechanism places the packaging bag on the conveying mechanism. The bag opening contacts the conveying part, which is in motion, before the main body, thereby pulling and flattening the bag opening.

[0038] The beneficial effects of this invention are:

[0039] This invention proposes a bag folding device and method. After the bending mechanism performs a folding action, the end of the bag opening is positioned below the main body. An abutment mechanism holds the bag opening in the folded state. The bending mechanism is then withdrawn, completing the pre-folding of the bag opening. When the conveying mechanism receives the packaging bag, the bag opening abuts against the conveying part before the main body, allowing the bag opening to be flattened and firmly pressed under the main body, completing the final folding of the bag opening. The cooperation between the abutment mechanism and the conveying part fills the time window between the withdrawal of the folding mechanism and the heat sealing device. Without requiring complex modifications to the bending mechanism, it overcomes the deformation recovery problem caused by the packaging bag's own springback characteristics, avoiding misalignment, wrinkling, or incomplete sealing during subsequent sealing, significantly improving sealing quality. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the bag folding device in this invention;

[0041] Figure 2 yes Figure 1 Enlarged view of a portion of point A in the middle;

[0042] Figure 3 This is a schematic diagram of the structure of the handling mechanism and the conveying mechanism in this invention;

[0043] Figure 4 This is a schematic diagram of the bending mechanism in this invention;

[0044] Figure 5 This is one of the schematic diagrams of the bag opening bending process in this invention;

[0045] Figure 6 This is the second schematic diagram of the bag opening bending process in this invention;

[0046] Figure 7 This is the third schematic diagram of the bag opening bending process in this invention.

[0047] In the picture:

[0048] 100. Packaging bag; 110. Body; 120. Bag opening;

[0049] 1. Handling mechanism; 11. Lifting unit; 12. Platform; 121. Notch; 13. Handling unit; 14. Bag pressing unit; 141. Bag pressing frame; 142. Bag pressing cylinder; 143. Bag pressing head;

[0050] 2. Bending mechanism; 21. Frame; 22. Drive unit; 23. Clamping unit; 231. First clamping arm; 232. Second clamping arm; 233. First drive component; 24. Actuating unit; 241. Second drive component; 242. Actuating lever;

[0051] 3. Abutting mechanism; 31. Abutting cylinder; 32. Abutting block;

[0052] 4. Conveying mechanism; 41. Synchronous belt. Detailed Implementation

[0053] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0054] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0056] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0057] Please see Figures 1 to 7 This embodiment proposes a bag folding device, which aims to keep the bag opening 120 of the packaging bag 100 in a folded state after the bending mechanism folds it, thereby improving the subsequent sealing quality.

[0058] Specifically, the bag folding device includes a conveying mechanism 1, a bending mechanism 2, an abutting mechanism 3, and a conveying mechanism 4. The conveying mechanism 1 is configured to transfer the packaging bag 100 containing the product to the bag folding station. The bending mechanism 2 is located at the bag folding station and is configured to fold the bag opening 120 of the packaging bag 100 in a first direction so that the end of the bag opening 120 is lower than the bottom of the body 110 of the packaging bag 100. The abutting mechanism 3 is connected to the conveying mechanism 1 and is configured to restrict the bag opening 120 after the folding is completed to return to the reverse direction and keep it in the folded state. The conveying mechanism 4 includes a conveying section that moves along the first direction. The conveying section is used to receive the packaging bag 100 carried by the conveying mechanism 1 so that when receiving the packaging bag 100, the bag opening 120 contacts the moving conveying section before the body 110 and can be pulled and flattened by the conveying section.

[0059] Understandably, after the bending mechanism 2 performs the folding action, the end of the bag opening 120 is positioned below the body 110. The abutment mechanism 3 keeps the bag opening 120 in a folded state. Then, the bending mechanism 2 is withdrawn, completing the pre-folding of the bag opening 120. When the conveying mechanism 4 receives the packaging bag 100 transported by the handling mechanism 1, the bag opening 120 abuts against the conveying part before the body 110, allowing the bag opening 120 to be flattened and firmly pressed under the body 110, completing the final folding of the bag opening 120. This ensures that the bag opening 120 remains flat and properly folded before entering the subsequent heat-sealing process. With the cooperation of the abutment mechanism 3 and the conveying part, the time window between the withdrawal of the folding mechanism and the heat sealing can be filled. Without complex modifications to the bending mechanism 2, the deformation recovery problem caused by the elasticity of the packaging bag 100 can be overcome, thereby avoiding misalignment, wrinkling, or poor sealing during subsequent sealing, significantly improving the sealing quality.

[0060] Similarly, it is understandable that the handling mechanism 1 can complete the bag folding operation while transporting the packaging bag 100 to the conveying mechanism 4. After the bag is folded, the packaging bag 100 can be directly output under the action of the conveying mechanism 4. Therefore, when arranging this bag folding device, the existing conveying structure can be used without complicated modifications. Compared with the solution of using a complicated folding structure to continuously press the bag opening 120 until the sealing is completed, this setting not only helps to simplify the overall equipment structure, but also maintains an efficient production cycle.

[0061] Based on the above, this embodiment also proposes a bag-folding method, which includes the following steps:

[0062] Move the 100 packaging bags containing the products to the bag folding station;

[0063] The bending mechanism 2 folds the opening 120 of the packaging bag 100 toward the first direction so that the end of the opening 120 is below the body 110 of the packaging bag 100.

[0064] The abutment mechanism 3 is used to restrict the bag opening 120 to reverse reset, so that the bag opening 120 is kept in the folded state;

[0065] After the bag opening 120 is folded over, the handling mechanism 1 places the packaging bag 100 on the conveying mechanism 4. The bag opening 120 contacts the conveying part in motion before the body 110, so that the bag opening 120 can be pulled and flattened.

[0066] In this embodiment, the conveying unit includes two synchronous belts 41, which are spaced apart along a second direction perpendicular to the first direction; the handling mechanism 1 includes a lifting unit 11 and a platform 12 connected to the lifting unit 11, the platform 12 being located between the two synchronous belts 41, and the lifting unit 11 being configured to drive the platform 12 to lift so that the packaging bag 100 on the platform 12 overlaps the two synchronous belts 41. It is understood that the lifting unit 11 can adjust the platform 12 from a first height position to a second height position. The heights of the first height position, the bearing surface of the synchronous belt 41, and the second height position are successively reduced in the vertical direction. When the platform 12 is at the first height position, it can receive the packaging bag 100 containing the product and can transfer the packaging bag 100 above the synchronous belt 41. When the packaging bag 100 is placed on the platform 12, it can extend to the outside of the platform 12 on both sides in the second direction. During the process of adjusting the platform 12 from the first height position to the second height position, the bag opening 120 abuts against the synchronous belt 41 before the body 110. The bag opening 120 can be pulled and flattened by the synchronous belt 41. As the height of the platform 12 continues to decrease, the body 110 can overlap the two synchronous belts 41 and continuously press the bag opening 120.

[0067] Similarly, it is understandable that the gap between the two synchronous belts 41 can not only avoid the platform 12, but also reduce the space occupied by the entire bag folding device. By adopting the lifting and handover method, it can ensure that the packaging bag 100 containing the product can be smoothly overlapped on the two synchronous belts 41, so as to avoid the packaging bag 100 from sliding or shifting during the transfer process, and ensure the positional accuracy and posture stability of the packaging bag 100 during the bag folding process.

[0068] The lifting unit 11 includes a lifting cylinder and a regulating valve connected to the air passage of the lifting cylinder. The regulating valve is configured to adjust the lifting speed of the lifting cylinder. The piston rod of the lifting cylinder is arranged in a vertical direction. Under the action of the regulating valve, the extension and retraction rate of the piston rod can be controlled to ensure the stability of the platform 12 during the lifting process, and further ensure the stability of the packaging bag 100 during the handover process.

[0069] The conveying mechanism 4 includes a synchronous shaft and a servo motor that is connected to one of the synchronous belts 41. The servo motor can drive one of the synchronous belts 41 to rotate in a first direction. Under the action of the synchronous shaft, the other synchronous belt 41 can rotate accordingly to ensure the stability of the packaging bag 100 during transportation.

[0070] In addition, the conveying mechanism 1 also includes a conveying section 13 and a bag-pressing section 14. The conveying section 13 is connected to the lifting section 11 and is configured to control the platform 12 to move in or away from the bag-folding station. The bag-pressing section 14 is connected to the conveying section 13 and is mounted above the platform 12. It is configured to abut against the top of the packaging bag 100 when the packaging bag 100 is being conveyed. Under the action of the conveying section 13, the platform 12 can be connected to the previous process to receive the packaging bag 100 containing the product. Then, the platform 12 is moved to the bag-folding station for bag-folding operations. During this process, the bag-pressing section 14 maintains contact with the top of the packaging bag 100. The combined action of the platform 12 and the bag-pressing section 14 ensures the stability of the packaging bag 100 during conveying.

[0071] The conveying unit 13 is preferably a linear module as in the prior art, having a conveying seat for mounting the lifting unit 11. The bag-pressing unit 14 includes a bag-pressing frame 141, a bag-pressing cylinder 142, and a bag-pressing head 143 connected to the bag-pressing cylinder 142. One end of the bag-pressing frame 141 is fixed to the conveying seat, and the other end can extend above the platform 12. The middle part of the bag-pressing frame 141 has a clearance groove for avoiding the timing belt 41 and the platform 12. That is, the bag-pressing frame 141 can extend to the outside of the timing belt 41 to form a clearance. The bag-pressing cylinder 142 is arranged vertically at the other end of the bag-pressing frame 141. After the platform 12 receives the packaging bag 100 containing the product, the bag-pressing cylinder 142 controls the bag-pressing head 143 to descend and abut against the top of the packaging bag 100.

[0072] It should be noted that after the bag opening 120 is bent and pulled out by the bending mechanism 2, the bag pressing cylinder 142 controls the bag pressing head 143 to separate from the packaging bag 100.

[0073] In this embodiment, as Figure 2 As shown, the abutting mechanism 3 includes an abutting cylinder 31 and an abutting block 32 connected to the abutting cylinder 31. The abutting cylinder 31 is connected to the lifting part 11 and is configured to drive the abutting block 32 to rise and fall, so that the abutting block 32 has a limiting position and a clearance position that avoid the folding path of the bag opening 120. It can be understood that the abutting mechanism 3 can rise and fall together with the platform 12. When the bending mechanism 2 bends the bag opening 120, the piston rod of the abutting cylinder 31 is in a retracted state, that is, the abutting block 32 is in a clearance position, so that the bending mechanism 2 can bend the bag opening 120. After the bending is completed, the piston rod of the abutting cylinder 31 switches from the retracted state to the extended state, so that the abutting block 32 can switch from the clearance position to the limiting position, so that after the bending mechanism 2 is withdrawn, the bag opening 120 can always be kept in the folded state.

[0074] Furthermore, such as Figure 6As shown, the platform 12 is provided with a notch 121 for inserting the bending mechanism 2, and the main body 110 on the platform 12 can extend above the notch 121. It can be understood that when the packaging bag 100 is placed on the platform 12, the main body 110 and the bag opening 120 are placed along the first direction, the notch 121 is located on one side of the bag opening 120, and the main body 110 can partially extend above the notch 121 when placed on the platform 12. When the bending mechanism 2 bends the bag opening 120, it can fold the bag opening 120 in the first direction and fold it into the inside of the notch 121 to ensure that the end of the bag opening 120 is lower than the main body 110. During the folding process, the bag opening 120 can abut against the side wall of the notch 121, which can prevent the bag opening 120 from entering below the platform 12 due to excessive bending, thereby avoiding interference between the bag opening 120 and the lifting path of the platform 12.

[0075] The bending mechanism 2 includes a frame 21, a drive unit 22, a clamping unit 23, and a toggle unit 24. The frame 21 is arranged adjacent to the conveying mechanism 4. The drive unit 22 is connected to the frame 21 and is configured to drive the frame 21 closer to or away from the packaging bag 100. The drive unit 22 is preferably a linear module in the prior art. The clamping unit 23 is disposed on the frame 21 and is configured to clamp the upper and lower sides of the bag opening 120, causing it to bend downward. The toggle unit 24 is disposed on the frame 21 and is configured to toggle the downwardly bent bag opening 120, causing it to extend downward toward the body 110. Understandably, after the conveying mechanism 1 transports the packaging bag 100 to the folding station, the drive unit 22 drives the frame 21 to approach the packaging bag 100 and clamps the bag opening 120 through the clamping unit 23, causing it to change from a horizontal state to a downward bent state. The clamping method ensures the stability of the bag opening 120 during the bending process. Subsequently, the actuating unit 24 moves the bag opening 120 horizontally to complete the pre-fold. After the abutting mechanism 3 abuts against the bent bag opening 120 and forms a limit, the drive unit 22 drives the frame 21 away from the packaging bag 100, thereby separating the actuating unit 24 and the clamping unit 23 from the bag opening 120. With the combined action of the clamping unit 23 and the actuating unit 24, it is ensured that the bag opening 120 of each packaging bag 100 can form a uniform shape and accurate fold.

[0076] The clamping part 23 includes a first clamping arm 231, a second clamping arm 232, and a first driving member 233. The first clamping arm 231 is fixed to the frame 21 and extends along a second direction; the second clamping arm 232 extends along the second direction and is staggered with the first clamping arm 231 in a horizontal direction; the first driving member 233 is fixed to the frame 21 and connected to the second clamping arm 232, and is configured to drive the second clamping arm 232 to move in a vertical direction, so that the first clamping arm 231 and the second clamping arm 232 can clamp the upper and lower sides of the bag opening 120 and bend it downwards. It can be understood that when the bending mechanism 2 performs the folding operation, the first clamping arm 231 is above the second clamping arm 232. Under the action of the driving part 22, it can drive the first clamping arm 231 and the second clamping arm 232 to move closer to the bag opening 120, so that the second clamping arm 232 is below the bag opening 120 and the first clamping arm 231 is above the bag opening 120 (e.g., ...). Figure 5 As shown), under the action of the first driving member 233, the second clamping arm 232 can drive the bag opening 120 to move upward and approach the first clamping arm 231. Since the first clamping arm 231 and the second clamping arm 232 are staggered, as the second clamping arm 232 continues to rise, the bag opening 120 can bend downward at the first clamping arm 231 (as shown). Figure 6 (As shown), then under the action of the actuating part 24, the bag opening 120 is guided to the inside of the notch 121 to complete the pre-fold.

[0077] It should be noted that, in the horizontal direction, the second clamping arm 232 is located on the side of the first clamping arm 231 closer to the body 110, so that the bag opening 120 forms a downward curve at the first clamping arm 231.

[0078] The actuating part 24 includes a second driving member 241 and a lever 242. The second driving member 241 is fixed to the frame 21. The lever 242 is connected to the second driving member 241, and the second driving member 241 is configured to drive the lever 242 to move horizontally. It can be understood that the length direction of the lever 242 is set along the second direction, and the lever 242 is located below the first clamping arm 231. After the bag opening 120 bends downward at the first clamping arm 231, the second driving member 241 can drive the lever 242 to move along the first direction. When it moves to the position of the notch 121, the abutment block 32 rises, which can constrain the bag opening 120. Then, under the action of the driving part 22, the first clamping arm 231, the second clamping arm 232, and the lever 242 can be separated from the bag opening 120 at the same time.

[0079] The first driving component 233 and the second driving component 241 are both preferably linear motion structures in the prior art, such as ball screw assemblies or linear cylinders.

[0080] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A bag-folding device, characterized in that, include: The handling mechanism (1) is configured to transfer the packaging bag (100) containing the product to the bag folding station; A bending mechanism (2) is provided at the bag folding station and is configured to fold the bag opening (120) of the packaging bag (100) in a first direction so that the end of the bag opening (120) is below the body (110) of the packaging bag (100); The abutting mechanism (3), connected to the conveying mechanism (1), is configured to prevent the bag opening (120) after folding from resetting in the reverse direction, so that it remains in the folded state; The conveying mechanism (4) includes a conveying section that moves along the first direction. The conveying section is used to receive the packaging bag (100) carried by the handling mechanism (1). When receiving the packaging bag (100), the bag opening (120) contacts the conveying section in motion before the body (110), and can be pulled and flattened by the conveying section. The conveying unit includes two synchronous belts (41), which are spaced apart along a second direction perpendicular to the first direction; The conveying mechanism (1) includes a lifting part (11) and a platform (12) connected to the lifting part (11). The platform (12) is located between the two synchronous belts (41). The lifting part (11) is configured to drive the platform (12) to lift so that the packaging bag (100) on the platform (12) overlaps the two synchronous belts (41). The abutting mechanism (3) includes an abutting cylinder (31) and an abutting block (32) connected to the abutting cylinder (31). The abutting cylinder (31) is connected to the lifting part (11) and is configured to drive the abutting block (32) to rise and fall, so that the abutting block (32) has a limiting position and an avoidance position that are in and avoid the folding path of the bag opening (120).

2. The bag folding device according to claim 1, characterized in that, The platform (12) is provided with a notch (121) for inserting the bending mechanism (2), and the body (110) on the platform (12) can extend above the notch (121).

3. The bag folding device according to claim 1, characterized in that, The transport mechanism (1) further includes: The conveying unit (13), connected to the lifting unit (11), is configured to control the platform (12) to move into or away from the folding station; The bag pressing part (14) is connected to the conveying part (13) and is mounted above the platform (12). It is configured to abut against the top of the body (110) when the packaging bag (100) is transferred.

4. The bag folding device according to claim 1, characterized in that, The lifting unit (11) includes a lifting cylinder and a regulating valve connected to the air passage of the lifting cylinder. The regulating valve is configured to adjust the lifting speed of the lifting cylinder.

5. The bag folding device according to claim 1, characterized in that, The bending mechanism (2) includes: The frame (21) is arranged adjacent to the conveying mechanism (4); A drive unit (22), connected to the frame (21), is configured to drive the frame (21) closer to or further away from the packaging bag (100); A clamping part (23) is provided on the frame (21) and configured to clamp the upper and lower sides of the bag opening (120) so that it bends downward; A toggle part (24), provided on the frame (21), is configured to toggle the downwardly curved bag opening (120) so that it extends downward toward the body (110).

6. The bag-folding device according to claim 5, characterized in that, The clamping part (23) includes: The first clamping arm (231) is fixed to the frame (21) and extends along the second direction; The second clamping arm (232) extends along the second direction and is staggered with the first clamping arm (231) in the horizontal direction; The first drive member (233), fixed to the frame (21) and connected to the second clamping arm (232), is configured to drive the second clamping arm (232) to move in the vertical direction so that the first clamping arm (231) and the second clamping arm (232) can clamp the upper and lower sides of the bag opening (120) and bend it downward.

7. The bag folding device according to claim 5, characterized in that, The actuating part (24) includes: The second driving component (241) is fixed to the frame (21); A lever (242) is connected to a second drive member (241), which is configured to drive the lever (242) to move horizontally.

8. A method for folding bags, characterized in that, The application of the bag folding device as described in any one of claims 1-7 includes the following steps: The packaging bag (100) containing the product is moved to the bag folding station; The bending mechanism (2) folds the opening (120) of the packaging bag (100) in the first direction so that the end of the opening (120) is below the body (110) of the packaging bag (100); The abutment mechanism (3) is used to restrict the bag opening (120) from reversing and reset, so that the bag opening (120) remains in the folded state; After the bag opening (120) is folded over, the handling mechanism (1) places the packaging bag (100) on the conveying mechanism (4). The bag opening (120) contacts the conveying part in motion before the body (110), thereby pulling and flattening the bag opening (120).

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