Packaging bag closing and bundling folding mechanism
The coordinated movement of the main shaft and clamping rod structure enables the folding and clamping of the inner bag torsion bundle, solving the problem of insufficient sealing of the inner bag and ensuring the sealing effect of the inner bag.
Patent Information
- Application Number
- CN202512020202.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-30
- Publication Date
- 2026-02-13
AI Technical Summary
In the existing technology, the inner bag torsion bundle lacks effective restraint after torsion, resulting in insufficient sealing. In particular, when loading powder materials, it is easy for the unloaded rotation to occur, affecting the sealing effect.
It adopts a horizontally suspended main shaft and clamping rod structure. The movement of the clamping rod and clamping arm is controlled by the drive unit to realize the folding and clamping of the inner bag twist bundle. The middle section is blocked by the stop bar to prevent the twist bundle from rotating back. Combined with the rope operation, the sealing is ensured.
It effectively prevents the twisting and unloading force from returning at the opening of the inner bag, ensuring the airtightness of the inner bag and improving the sealing effect.
Smart Images
Figure CN121516352A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to packaging machines, and more specifically to a packaging bag closing and folding mechanism. Background Technology
[0002] Plastic woven bags are primarily composed of polypropylene and polyethylene tapes, woven together in a warp and weft pattern. They offer significant advantages in structural strength and flexibility, but their sealing performance is poor, especially when loading powdered materials. In such cases, a double-layer packaging method is required, with the inner layer being a sealed plastic film bag. This double-layer approach achieves both sealing and load-bearing capacity. Existing technology improves the bag's seal by twisting the inner bag's opening tie, which is then secured with a binding rope.
[0003] However, there is still room for improvement in the sealing performance of the inner bag's closing tie after twisting. Moreover, it was found during use that: due to the lack of restraint in the lower section of the inner bag's twisting tie, the bag opening twisting tie has a restoring force that rotates in the opposite direction. Simply tying the tie at the bag opening position cannot restrict the rotation of the bag body below the tie, resulting in the inner bag twisting tie being unloaded and rotating, or even completely turning from a twisting tie into a simple closing tie, leading to twisting failure and affecting the sealing performance of the inner bag. Summary of the Invention
[0004] This invention provides a packaging bag closing tie folding mechanism, which folds the twisted tie after the bag opening is closed, reducing the possibility of the twisted tie loosening after the folded tie is tied, and ensuring the inner bag's airtightness.
[0005] To achieve the above objectives, the technical solution adopted is as follows: a bracket is connected to the end of the horizontally suspended main shaft, and two horizontally placed clamping rods are hinged to the bracket. A first drive unit drives the suspended ends of the two clamping rods to swing towards or away from each other. When the suspended ends of the two clamping rods are in a position where they are close to each other, the extension direction of the clamping rods is consistent with the extension direction of the main shaft. The swing paths of the two clamping rods are coplanar, and the shaft core of the main shaft and the plane containing the swing paths of the clamping rods are arranged at intervals. A horizontally placed clamping rod is provided on the side where the suspended end of the main shaft is located. The stop bar is parallel to the main shaft and the two end faces are opposite each other. When the two clamping rods are in a position close to each other, the stop bar and the clamping rod have a section that overlaps in the axial length direction of the main shaft. The bracket is hinged to a clamping arm. The hinge axis of the clamping arm and the hinge axis of the clamping rod are parallel to each other and perpendicular to the axis of the main shaft. The swing paths of the clamping arm and the clamping rod are coplanar and the clamping arm is located on the opposite side of the inner clamping surface of one of the clamping rods. The second drive unit drives the suspension end of the clamping arm and the suspension end of the clamping rod to swing towards or away from each other.
[0006] Compared with the prior art, the technical effect of the present invention is as follows: the first driving unit drives the suspension ends of the two clamping rods to approach each other and clamp the upper section of the inner bag twist bundle, and uses the stop bar to block the middle section of the inner bag twist bundle. At the same time, the main shaft drives the clamping rod to rotate 180 degrees, which can flip the upper section of the inner bag twist bundle to the other side of the stop bar, thereby realizing the folding of the inner bag twist bundle. After the folded bundle is tied with a rope, it can effectively prevent the twist bundle at the inner bag opening from not being unloaded and rotating back, thus ensuring the sealing of the inner bag opening. Attached Figure Description
[0007] Figure 1 This is a three-dimensional appearance diagram of the present invention;
[0008] Figure 2 This is a schematic diagram of the stop lever;
[0009] Figure 3 This is a schematic diagram of the initial position of the two clamping rods before they flip over in the closed state.
[0010] Figure 4 This is a schematic diagram showing the position of the two clamping rods after they have flipped over in the closed state.
[0011] Figure 5 This is a schematic diagram showing the clamping rod and clamping arm in the closed state.
[0012] Figure 6 This is a schematic diagram of the inner bag before it is flipped over when the two clamping rods hold the inner bag's drawstring.
[0013] Figure 7 This is a schematic diagram showing the clamping state of the inner bag's drawstring after it has been flipped over, with the clamping arms holding the bag in place.
[0014] Figure 8 for Figure 6 The M-direction view in the image. Detailed Implementation
[0015] The following is in conjunction with the appendix Figure 1-8 The present invention will be further described in detail below, including related content:
[0016] A packaging bag folding and closing mechanism includes a support 20 connected to the end of a horizontally suspended main shaft 10. Two horizontally placed clamping rods 31 are hinged to the support 20. A first driving unit 30 drives the suspended ends of the two clamping rods 31 to swing towards or away from each other. When the suspended ends of the two clamping rods 31 are in a position where they are close to each other, the extension direction of the clamping rods 31 is consistent with the extension direction of the main shaft 10. The swing paths of the two clamping rods 31 are coplanar, and the axis of the main shaft 10 and the plane containing the swing paths of the clamping rods 31 are spaced apart. A horizontally placed stop bar 50 is provided on the side where the suspended end of the main shaft 10 is located. Parallel to the main shaft 10 and with their end faces facing each other, when the two clamping rods 31 are in a position close to each other, the stop rod 50 and the clamping rod 31 have a section overlapping in the axial length direction of the main shaft 10. A clamping arm 41 is hinged to the bracket 20. The hinge axis of the clamping arm 41 is parallel to the hinge axis of the clamping rod 31 and perpendicular to the axis of the main shaft 10. The swing paths of the clamping arm 41 and the clamping rod 31 are coplanar, and the clamping arm 41 is located on the opposite side of the inner clamping surface 311 of one of the clamping rods 31. The second drive unit 40 drives the suspension end of the clamping arm 41 and the suspension end of the clamping rod 31 to swing towards or away from each other.
[0017] In the above technical solution, with Figure 1 Taking the K-axis view as an example, when folding the inner bag twist bundle A, firstly, the inner bag twist bundle A is placed upright, with the clamping rod 31 positioned above the stop rod 50. The first driving unit 30 drives the suspended ends of the two clamping rods 31 to approach each other and clamp the upper section of the inner bag twist bundle A. Simultaneously, the stop rod 50 blocks the middle section of the inner bag twist bundle A. Figure 6 As shown; then control the main shaft 10 to rotate, causing the clamping rod 31 to rotate 180 degrees. Under the obstruction of the stop rod 50, the upper section of the inner bag torsion bundle A can be rotated to the other side of the stop rod 50, realizing the folding of the inner bag torsion bundle A. At this time, by controlling the second drive unit 40 to drive the suspension end of the clamping arm 41 to move closer to the suspension end of the clamping rod 31, the clamping arm 41 and the adjacent clamping rod 31 clamp the lower section of the inner bag torsion bundle A, as shown. Figure 7 As shown, simultaneously, the stop bar 50 is withdrawn from the folded inner bag torsion bundle A. The two clamping bars 31 and the clamping bar 31 and clamping arm 41 effectively clamp and constrain the folded bundle A formed by the folding, facilitating subsequent tying operations by binding the upper section of the folded bundle without affecting the withdrawal of the clamping bars 31 and clamping arm 41 from the folded bundle. With the above folding scheme, after tying, it can effectively prevent the torsion bundle at the inner bag opening from not being unloaded and rotating back, ensuring the sealing of the inner bag opening.
[0018] It should be noted that when the two clamping rods 31 are in a position close to each other, the stop rod 50 and the clamping rods 31 have an overlapping section along the axial length of the main shaft 10, such as... Figure 8As shown, the inner bag twist bundle A is clamped by the clamping rod 31 in the area that coincides with the axial direction of the stop rod 50. This ensures that when the inner bag twist bundle A is flipped, it can be effectively folded under the obstruction of the stop rod 50.
[0019] As a preferred embodiment, a drive cylinder 42 is provided on the bracket 20, and a gear 43 is coaxially arranged on the hinge shaft of the clamping arm 41 that forms a rotatable engagement with the bracket 20. The piston rod extension end of the drive cylinder 42 is connected to a rack 44, which meshes with the gear 43 for transmission. By driving the rack 44 with the drive cylinder 42, the rack 44 is driven to rotate, thereby rotating the hinge shaft of the clamping arm 41 and the clamping arm 1 itself, thus controlling the opening and closing action of the clamping arm 41.
[0020] Furthermore, the first drive unit 30 is composed of a gripper cylinder 32 mounted on the bracket 20. The two gripper rods 31 form the two grippers of the gripper cylinder 32. When the gripper cylinder 32 is activated, it can drive the suspended ends of the two gripper rods 31 to be in a clamping position close to each other or in a separating position far from each other, thereby realizing the opening and closing action of the gripper rods 31.
[0021] Considering that in automated packaging operations, packaging bags are generally transported between upstream and downstream workstations by conveyor belts, to prevent the clamping rod 31 or clamping arm 41 from interfering with the packaging bag (specifically referring to the inner bag torsion bundle A), such as Figure 2 As shown, when the suspended ends of the two clamping rods 31 are in a separated position far apart from each other, the included angle between the two clamping rods 31 is 180 degrees. At this time, the clamping rods 31 will not extend into the displacement path of the packaging bag, thereby avoiding the inner bag torsion bundle A, so as to ensure that the two clamping rods 31 can be placed on opposite sides of the inner bag torsion bundle A, which facilitates the subsequent effective clamping of the inner bag torsion bundle A by the two clamping rods 31. In addition, in this state, the clamping arm 41 is arranged parallel to the clamping rods 31, and during the action of the main shaft 10 driving the clamping rods 31 to flip, the clamping arm 41 will not interfere with the inner bag torsion bundle A.
[0022] As a preferred option, such as Figure 2 As shown, in the overhang direction of the main shaft 10, the fixed frame 51 and the bracket 20 are spaced apart and a passage is left between them for the packaging bag to be transported downstream. The fixed frame 51 is equipped with a push cylinder 52. The end of the stop rod 50 away from the main shaft 10 is connected to the extension end of the piston rod of the push cylinder 52. The push cylinder 52 drives the stop rod 50 to make a translational movement closer to or away from the main shaft 10.
[0023] In this design, the fixed frame 51 and the support 20 are set at a distance from each other rather than on the same side of the packaging bag conveying path. Under this arrangement, the baffle 50 can be independently arranged on the fixed frame 51, avoiding the problem of how the baffle 50 can cooperate with the main shaft 10, the support 20 and other structures in the limited installation space when the fixed frame 51 and the support 20 are on the same side. The arrangement of the baffle 50 and its drive structure is also more convenient.
[0024] As a preferred embodiment, the system also includes a test stand 60, on which the main spindle 10 is mounted and a power unit 61 for driving the main spindle 10 to rotate is mounted. A slider 62 is connected to the lower end of the test stand 60. A guide rail 71 with its extension direction parallel to the axial length direction of the main spindle 20 is mounted on the frame 70 located below the test stand 60. The slider 62 and the guide rail 71 form a limiting guide fit that limits the displacement of the slider 62 along the extension direction of the guide rail 71.
[0025] In this solution, by setting up the frame 60 and the guide rail 71, when it is necessary to tie the folded bundle in the subsequent process, after the tying station has constrained the folded bundle, the clamping rod 31 and clamping arm 41 are appropriately relaxed to release the clamping of the folded bundle. At this time, the frame 60 can be moved along the guide rail 71 to the side away from the packaging bag, so that the clamping rod 31 and clamping arm 41 can be pulled out from the folded bundle, thus avoiding interference with the tying process.
[0026] Finally, it should be added that the power unit 61 can directly drive the spindle 10 to rotate via a servo motor, or indirectly drive the spindle 10 to rotate via a reduction mechanism or other gear transmission mechanism.
Claims
1. A packaging bag folding mechanism, wherein a bracket (20) is connected to the end of a horizontally suspended main shaft (10), and two horizontally placed clamping rods (31) are hinged to the bracket (20). A first driving unit (30) drives the suspended ends of the two clamping rods (31) to swing towards or away from each other. When the suspended ends of the two clamping rods (31) are in a position where they are close to each other, the extension direction of the clamping rods (31) is consistent with the extension direction of the main shaft (10). The swing paths of the two clamping rods (31) are coplanar, and the core of the main shaft (10) and the plane where the swing path of the clamping rods (31) is located are arranged at intervals. A horizontally placed stop bar (50) is provided on the side where the extended end of the main shaft (10) is located. The stop bar (50) is parallel to the main shaft (10) and the two end faces are opposite each other. When the two clamping rods (31) are in a position where they are close to each other, the stop bar (50) and the clamping rods (31) have a section that overlaps in the axial length direction of the main shaft (10). The mechanism is characterized in that: A clamping arm (41) is hinged to the bracket (20). The hinge axis of the clamping arm (41) is parallel to the hinge axis of the clamping rod (31) and perpendicular to the axis of the main shaft (10). The swing paths of the clamping arm (41) and the clamping rod (31) are coplanar, and the clamping arm (41) is located on the opposite side of the inner clamping surface (311) of one of the clamping rods (31). The second drive unit (40) drives the suspension end of the clamping arm (41) and the suspension end of the clamping rod (31) to swing towards or away from each other.
2. The packaging bag closing and folding mechanism according to claim 1, characterized in that: A drive cylinder (42) is provided on the bracket (20). A gear (43) is arranged on the hinge shaft of the clamp arm (41) that forms a rotational engagement with the bracket (20). A rack (44) is connected to the extension end of the piston rod of the drive cylinder (42). The rack (44) meshes with the gear (43) for transmission.
3. The packaging bag closing and folding mechanism according to claim 1 or 2, characterized in that: The first drive unit (30) is composed of a gripper cylinder (32) mounted on a bracket (20). Two gripper rods (31) form two grippers of the gripper cylinder (32). The gripper cylinder (32) drives the suspended ends of the two gripper rods (31) to be in a clamping position close to each other or in a separating position far from each other.
4. The packaging bag closing and folding mechanism according to claim 3, characterized in that: When the suspension ends of the two clamps (31) are in a separated position far apart from each other, the included angle between the two clamps (31) is 180 degrees and the clamp arm (41) is arranged parallel to the clamp (31).
5. The packaging bag closing and folding mechanism according to claim 1, characterized in that: In the overhang direction of the main shaft (10), the fixed frame (51) and the bracket (20) are spaced apart and a passage for the packaging bag to be transported downstream is left between them. The fixed frame (51) is equipped with a push cylinder (52). The end of the stop rod (50) away from the main shaft (10) is connected to the extension end of the piston rod of the push cylinder (52). The push cylinder (52) drives the stop rod (50) to make a translational movement close to or away from the main shaft (10).
6. The packaging bag closing and folding mechanism according to claim 1, characterized in that: It also includes a stand (60), a main shaft (10) is mounted on the stand (60) and a power unit (61) is mounted on the stand (60) to drive the main shaft (10) to rotate. A slider (62) is connected to the lower end of the stand (60). A guide rail (71) with its extension direction parallel to the axial length direction of the main shaft (20) is mounted on the frame (70) located below the stand (60). The slider (62) and the guide rail (71) form a limiting guide fit that limits the displacement of the slider (62) along the extension direction of the guide rail (71).